Patent Publication Number: US-2022220011-A1

Title: Grinding water treatment device for eyeglasses lens processing

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority from Japanese Patent Applications No. 2021-004346 filed on Jan. 14, 2021 and No. 2021-174482 filed on Oct. 26, 2021, the entire subject-matters of which are incorporated herein by reference. 
     TECHNICAL FIELD 
     The present disclosure relates to a grinding water treatment device for eyeglasses lens processing, which separates and treats processing chips from grinding water discharged from a processing device of an eyeglasses lens. 
     BACKGROUND 
     As a grinding water treatment device for eyeglasses lens processing, a device that separates and treats processing chips and water by using a centrifugal separator is known (refer to JP-A-2002-283236 and JP-A-2005-153134). In a centrifugal separator of JP-A-2002-283236, water is separated by repelling water from an opening opened at an upper portion of a dehydration tank by rotating the dehydration tank. In a centrifugal separator of JP-A-2005-153134, a conical filter is supported by a support frame inside a rotating dehydration tank, and water is filtered outward to be separated by the filter rotated together with the dehydration tank. 
     However, in the centrifugal separators disclosed in JP-A-2002-283236 and JP-A-2005-153134, it is necessary for an operator to frequently take out the processing chips accumulated inside the dehydration tank, which makes the work troublesome and inefficient. 
     SUMMARY 
     An object of the present disclosure is to provide a grinding water treatment device for eyeglasses lens processing, which enables to efficiently and appropriately treat grinding water and processing chips. 
     A grinding water treatment device for eyeglasses lens processing, including: 
     a centrifugal separator that includes a dehydration tank into which grinding water used in a processing device of an eyeglasses lens is introduced, and separates the grinding water into water and processing chips by rotation of the dehydration tank; 
     a scraping unit that scrapes out the processing chips accumulated on a side wall inside the dehydration tank; 
     an opening provided in the dehydration tank and through which the processing chips scraped out by the scraping unit are ejected to an outside of the dehydration tank; and 
     a filter provided in an outer region of the opening, and through which the water separated from the grinding water by rotation of the dehydration tank passes to allow the processing chips to be present inside the dehydration tank. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a view illustrating a schematic configuration of the whole of an eyeglasses lens processing apparatus according to an example. 
         FIG. 2  is a schematic sectional view for describing a configuration of a centrifugal separator and a water receiving unit. 
         FIG. 3  is a perspective view describing a configuration of a bottom plate. 
         FIG. 4  is a view illustrating an example of a direction of a drainage hole of a grinding water introduction pipe. 
         FIG. 5  is a view describing driving of a scraper. 
         FIG. 6  is a block diagram illustrating a control system in the example. 
         FIG. 7A  is a view describing a positional relationship between processing chips and water in a case where centrifugal separation is performed. 
         FIG. 7B  is a view describing a positional relationship between processing chips and water in a case where centrifugal separation is performed. 
         FIG. 8  is a view describing a configuration of a grinding water treatment device according to another example. 
         FIG. 9A  is a view describing a configuration of a grinding water receiving unit. 
         FIG. 9B  is a view describing a configuration of the grinding water receiving unit. 
     
    
    
     DETAILED DESCRIPTION 
     [Overview] 
     An embodiment of a grinding water treatment device for eyeglasses lens processing according to the present disclosure will be described. The items classified by &lt; &gt; below can be used independently or in association with each other. 
     The grinding water treatment device exemplified in the present disclosure (for example, a grinding water treatment device  200 ) includes a centrifugal separator (for example, centrifugal separators  210  and  210 B). For example, the centrifugal separator includes a dehydration tank (for example, dehydration tanks  211  and  211 B). For example, grinding water that has been used is introduced into the dehydration tank from a processing device (for example, a processing device  1 ) of an eyeglasses lens. For example, the centrifugal separator separates the grinding water into water and processing chips by rotation of the dehydration tank. For example, the centrifugal separator includes a scraping unit (for example, scraping mechanism units  600  and  600 B). For example, the centrifugal separator may include a grinding water introducing unit (for example, a grinding water introduction pipe  150  and a grinding water introduction unit  150 B). For example, the centrifugal separator may include a wash water injection unit (for example, a wash water injection unit  550 ) that ejects wash water. 
     For example, the grinding water treatment device may include a water receiving unit (for example, a water receiving unit  500 ) that receives water discharged from the dehydration tank, which is water separated by the rotation of the dehydration tank. For example, the grinding water treatment device may include a grinding water tank (for example, a tank  81 ) for storing the grinding water supplied to the processing device. For example, the water separated from the grinding water is discharged into the grinding water tank by a centrifugal separator, and accordingly, the grinding water is repeatedly used by the processing device. For example, the grinding water treatment device may include a notification unit (for example, a monitor  12 ). 
     &lt;Scraping Unit&gt; 
     The scraping unit is configured to scrape out the processing chips accumulated inside the dehydration tank. For example, the scraping unit includes a scraper (for example, a scraper  601 ) which is a member for scraping out the processing chips accumulated on an interior side of a side wall inside the dehydration tank. For example, the scraper is disposed inside the dehydration tank. For example, the scraper has a shape capable of scraping out the processing chips accumulated on the interior side of the side wall inside the dehydration tank. For example, the scraper includes a cutting edge portion (for example, a cutting edge portion  601   a ) having a shape along an interior wall of the side wall inside the dehydration tank. For example, the scraping unit includes a moving mechanism (for example, moving mechanisms  602  and  602 B) for moving the scraper between a retracted position and an operating position for scraping out the processing chips. 
     &lt;Dehydration Tank&gt; 
     For example, the dehydration tank includes a substantially cylindrical side wall (for example, side walls  211   a  and  211 Ba). The side wall inside the dehydration tank may have a conical shape of which the lower diameter is larger than that of the upper diameter. It is needless to say that the shape of the dehydration tank is not limited to these shapes. For example, the shape of the dehydration tank may be any shape as long as the grinding water can be separated into processing chips and water by the rotation of the dehydration tank. 
     For example, the rotation shaft of the dehydration tank may be rotatably held by a holding member (for example, a holding member  216 ) provided in a support mechanism (for example, a support mechanism  201 ) positioned at the upper portion of the dehydration tank. Then, the lower portion of the rotation shaft (for example, a rotation shaft  215 ) may be fixed to the bottom portion (for example, a bottom plate  212 ) of the dehydration tank. The dehydration tank is rotated by the rotation of the rotation shaft. 
     For example, the rotation shaft of the dehydration tank may be rotatably held by a holding member (for example, a holding member  216 B) provided in a support mechanism (for example, a base  206 B) positioned at the lower portion of the dehydration tank. Then, a coupling member (for example, a coupling member  162 B) for coupling the upper portion (for example, an upper wall  211 Bb and a second side wall  211 BaB) of the dehydration tank and the rotation shaft may be provided. 
     For example, an upper wall (for example, an upper wall  211   b ) may be provided at the upper portion of the dehydration tank. For example, the upper wall is formed in an annular shape. For example, in a case where the rotation shaft of the dehydration tank extending from the upper portion of the dehydration tank, the moving shaft of the scraping unit, and the grinding water introduction pipe are disposed inside the annular shape of the upper wall, the dehydration tank is rotated without interfering with these. For example, the upper wall is formed so as to extend in the horizontal direction from the upper end of the side wall inside the dehydration tank. It is needless to say that the shape of the upper wall is not limited thereto. For example, the upper wall may be inclined such that the rotation center side of the dehydration tank is higher than the upper portion of the side wall. Further, the upper wall may not necessarily have to be provided. For example, the upper portion of the side wall may be inclined toward the center of rotation and the side wall may also serve as the upper wall such that the bottom portion and the side wall inside the dehydration tank secure a region where processing chips are accumulated. 
     For example, the dehydration tank is provided with an opening (for example, opening  230 ). For example, the opening is provided to eject the processing chips scraped out by the scraping unit to the outside of the dehydration tank. For example, the opening is formed at the bottom portion of the dehydration tank such that the dropped processing chips scraped out by the scraping unit can pass through the opening. Since this opening is formed at the bottom portion of the dehydration tank, the processing chips scraped out by the scraping unit and naturally dropped can pass through the opening and be ejected to the outside of the dehydration tank. Therefore, the processing chips accumulated in the dehydration tank can be efficiently and appropriately treated. In addition, for example, in a case where the opening is provided at the bottom portion of the dehydration tank, a chips receiving unit (for example, a chips receiving unit  400 ) may be provided under the opening. In addition, the opening may be provided at the upper portion of the dehydration tank. 
     For example, the grinding water treatment device is provided with a filter (for example, a filter  220 ). For example, the filter is provided in the dehydration tank. The filter allows water separated from the grinding water by the rotation of the dehydration tank to pass therethrough, and allows the processing chips to be accumulated (present) inside the dehydration tank. For example, the filter can be disposed at various positions. For example, the filter is provided in the outer region (region outside the opening) of the opening for ejecting the processing chips. For example, the filter may be provided in the outer region of the opening at a position where the processing chips can be accumulated inside the dehydration tank. For example, the filter is provided at the bottom portion of the dehydration tank. In addition, the filter may be provided at the upper portion of the dehydration tank. For example, the filter may be provided between the opening for ejecting the processing chips and the side wall inside the dehydration tank. For example, the filter may be in the form of a mesh. 
     In the present disclosure, for example, since the filter is provided in the outer region of the opening for ejecting the processing chips, the water centrifugally separated inside the dehydration tank goes out of the dehydration tank through the filter, and thus, it is possible to suppress the discharge of the water in the dehydration tank from the opening. Accordingly, it is possible to suppress the mixing of the water into the processing chips ejected from the opening by the scraping unit, and the processing chips can be efficiently and appropriately treated. 
     In addition, in a case where the grinding water contains processing chips lighter than water, the water separated by centrifugal separation is positioned on the side wall side of the dehydration tank. In this case as well, the centrifugally separated water is discharged to the outside of the dehydration tank through the filter, and the processing chips are accumulated inside the dehydration tank. Accordingly, the processing chips accumulated inside the dehydration tank can be efficiently dehydrated, and the processing chips can be appropriately treated. 
     Further, for example, since the filter is provided in the outer region of the opening and at the bottom portion of the dehydration tank, even in a case where the rotation of the dehydration tank is stopped due to insufficient dehydration of the processing chips, the water remaining inside the dehydration tank passes through the filter and is discharged. Accordingly, it is possible to further suppress the outflow of water from the opening provided at the bottom portion of the dehydration tank, and it is possible to appropriately treat the processing chips. 
     In addition, in a case where the opening for ejecting the processing chips from the dehydration tank is provided at the upper portion of the dehydration tank, and in a case where the filter is disposed at the bottom portion of the dehydration tank, the filter may be provided at least in the outer region of the opening. As an example of the arrangement of the filter in this case, the filter may be disposed on the entire surface of the bottom portion of the dehydration tank. 
     Further, the filter is provided for accumulating the processing chips in the dehydration tank and discharging the water to the outside of the dehydration tank, and the arrangement of the filter is not limited to the dehydration tank as long as the function thereof is fulfilled. For example, the filter may be disposed between the water receiving unit and the dehydration tank described later. It is needless to say that the filter may be disposed above the water receiving unit. In this case, a seal may be provided to prevent the water or processing chips from flowing out between the filter and the dehydration tank. 
     &lt;Grinding Water Introducing Unit&gt; 
     For example, the grinding water introducing unit introduces the grinding water from the processing device into the dehydration tank. For example, the grinding water introducing unit is configured with a flow path for introducing the grinding water into the dehydration tank. For example, the grinding water introducing unit is provided so as to discharge the grinding water toward the interior side of the side wall inside the dehydration tank. Accordingly, it is possible to suppress the direct entrance of the grinding water discharged from the grinding water introducing unit to the opening for ejecting the processing chips. Further, since the grinding water is directed toward the interior side of the side wall, the grinding water is easily subjected to the action of centrifugal separation, and the processing chips and water are efficiently separated by centrifugal separation. 
     In addition, “discharging the grinding water toward the interior side of the side wall inside the dehydration tank” by the grinding water introducing unit of the present disclosure includes discharging the grinding water toward the interior side of the side wall inside the dehydration tank, and the discharged grinding water hits not only the side wall. 
     For example, in a case where the upper wall extending from the side wall inside the dehydration tank is provided so as to be inclined such that the rotation center side of the dehydration tank is higher than the upper portion of the side wall, the grinding water is discharged toward the interior side of the side wall inside the dehydration tank, and accordingly, the grinding water may hit the upper wall. According to this, the time required for the grinding water to be transferred along the side wall inside the dehydration tank and reach the filter is longer, and thus, the time for receiving the centrifugal force due to the rotation of the dehydration tank is increased, and as a result, the water and processing chips can be more efficiently separated from the grinding water. 
     For example, the grinding water introducing unit includes a grinding water introduction pipe for introducing the grinding water into the dehydration tank. For example, the discharge port of the grinding water introduction pipe is arranged on the side wall side of the dehydration tank with respect to the opening provided in the dehydration tank. Accordingly, it is further suppressed that the grinding water enters the opening for allowing the processing chips to pass therethrough. 
     In addition, for example, the grinding water introduction pipe extends inward from the upper portion of the dehydration tank, and the grinding water is dropped due to gravity. Further, the discharge port of the grinding water introduction pipe may be directed toward the interior side of the side wall inside the dehydration tank such that the grinding water is discharged toward the interior side of the side wall inside the dehydration tank. Accordingly, the grinding water is discharged toward the interior side of the side wall inside the dehydration tank by utilizing the force of the natural drop of the grinding water without using a pump. 
     Further, the cross-sectional area of the discharge port of the grinding water introduction pipe may be smaller than the cross-sectional area of the introduction port of the grinding water introduction pipe. Accordingly, the force of the grinding water emitted from the discharge port toward the interior side of the side wall inside the dehydration tank is gained, the grinding water is less likely to flow into the opening that allows the processing chips to pass therethrough, and the centrifugal separation by the rotation of the dehydration tank can be efficiently performed. In addition, accordingly, it is possible to contribute to the miniaturization of the dehydration tank. 
     Further, the direction of the discharge port of the grinding water introduction pipe may be directed not in the normal direction of the side wall inside the dehydration tank but in the direction in which the discharged grinding water heads along the rotation direction of the dehydration tank. Accordingly, when the grinding water discharged from the discharge port collides with the side wall inside the rotating dehydration tank, the accumulated processing chips, or the grinding water collected on the side wall side, bouncing and scattering are suppressed. As a result, it is possible to further suppress the entrance of the grinding water into the opening for ejecting the processing chips. 
     In one example of the present disclosure, since the opening for ejecting the processing chips is provided at the bottom portion of the dehydration tank, there is a new problem that the grinding water introduced from the grinding water introduction pipe enters the opening. In order to alleviate this problem, in the present disclosure, the arrangement of the grinding water introduction pipe inside the dehydration tank is devised as described above. 
     Further, for example, the grinding water introducing unit may have a grinding water receiving unit (for example, a grinding water receiving unit  153 B). The grinding water discharged from the processing device is introduced (charged) into the grinding water receiving unit. For example, the grinding water receiving unit is disposed inside the dehydration tank. For example, the grinding water introducing unit may include a rotation unit (for example, a rotation unit  217 B) that rotates the grinding water receiving unit in a direction identical to the rotation direction of the dehydration tank. Furthermore, the grinding water receiving unit may be rotated integrally with the dehydration tank. Then, a discharge opening (for example, a discharge opening  160 B) for discharging the grinding water toward the interior side of the side wall inside the dehydration tank may be provided on the outer periphery of the grinding water receiving unit. In this case, since the grinding water receiving unit is rotated in the same direction as the rotation direction of the dehydration tank, centrifugal force also acts on the grinding water received by the grinding water receiving unit, the grinding water is vigorously discharged (emitted) from the outer periphery of the discharge opening, and a force in the rotation direction acts on the grinding water discharged from the discharge opening at the same time. Accordingly, the generation of splashes (sprays) when the grinding water collides with the side wall (or the wall of the grinding water collected on the side wall) inside the dehydration tank that rotates at high speed is suppressed. In addition, the inhibition of centrifugal separation between the processing chips and water related to the grinding water collected on the side wall is suppressed, and the centrifugal separation between the processing chips and water is efficiently performed. 
     For example, the rotation unit of the grinding water receiving unit may be rotated integrally with the dehydration tank by being shared with the rotation unit (for example, a rotation unit  217 B) of the dehydration tank. Further, the grinding water receiving unit may be attached to the rotation shaft (for example, a rotation shaft  215 B) of the dehydration tank. The grinding water receiving unit may have a bottomed water receiving plate (for example, a water receiving plate  155 B) that receives the grinding water discharged from the processing device, and a plurality of coupling members (for example, coupling members  162 B) for coupling the water receiving plate and the dehydration tank. In this case, the discharge opening may be formed between the plurality of coupling members. Further, the coupling member may be integrally formed with the dehydration tank and the grinding water receiving unit. 
     For example, in a case where the grinding water introducing unit has a grinding water receiving unit, the dehydration tank has a two-stage structure including a first side wall (for example, a first side wall  211 BaA) provided at a lower part of the dehydration tank and a second side wall (for example, a second side wall  211 BaB) provided above the first side wall. For example, the first side wall may have a cylindrical surface or a conical surface of which the upper diameter is smaller than the lower diameter, the second side wall may have a conical surface of which the upper diameter is smaller than the lower diameter, and the angle formed by the conical surface of the second side wall with respect to the vertical direction may be larger than the angle formed by the cylindrical surface or the conical surface of the first side wall with respect to the vertical direction. In this case, the discharge opening may be positioned above the first side wall. For example, the discharge opening may be positioned between the heights of the conical surface of the second side wall. 
     &lt;Water Receiving Unit&gt; 
     For example, the water receiving unit includes a region for receiving water that has passed through the filter of the dehydration tank. For example, the water receiving unit is disposed below the filter. For example, the water receiving unit includes a drainage hole (for example, a drainage hole  501 ) for storing the water that has passed through the filter and discharging the water to a tank (for example, a tank  81 ) for storing the grinding water. For example, the water receiving unit may be disposed at least in a region other than the region of a part where the processing chips scraped out by the scraping mechanism unit pass through the opening. For example, the water receiving unit is disposed outside the opening for allowing the processing chips to pass therethrough. 
     &lt;Wash Water Injection Unit&gt; 
     For example, the wash water injection unit has a nozzle (for example, a nozzle  553 ) for ejecting wash water toward the filter of the dehydration tank. For example, the wash water injection unit is driven after the processing chips of the dehydration tank are scraped out by the scraping unit. Accordingly, the clogging of the filter is eliminated and the grinding water can be treated well. 
     For example, the wash water injection unit may include a tank into which the wash water enters is supplied, in addition to the tank in which the grinding water is stored. In this case, regarding the wash water in the tank, by driving the pump, the wash water is pumped up from the tank, and the wash water is injected from the nozzle. 
     For example, the nozzle is provided at a position where the wash water is ejected from below the filter. In this case, the tip end port of the nozzle may be provided so as to eject the wash water in the diagonally downward direction with respect to the filter at a position avoiding the position where the water that has passed through the filter is dropped. Accordingly, it is possible to suppress the direct entrance of the water that has passed through the filter into the tip end port of the nozzle when the wash water is not injected, and it is possible to suppress the clogging of the nozzle due to the fine processing chips that have passed through the filter. In addition, the mechanism for suppressing the clogging of the nozzle is not limited thereto. For example, the nozzle may be provided with a mechanism which is positioned at the retracted position that is not affected by the water that has passed through the filter during non-washing, and moves from the retracted position to the injection position where the wash water can be ejected toward the filter during the washing. Otherwise, the nozzle may be provided inside the dehydration tank. In this case, the nozzle injects the wash water from above the filter. 
     &lt;Arrangement of Each Mechanism with Respect to Dehydration Tank&gt; 
     For example, the holding unit of the rotation shaft for rotating the dehydration tank and the rotation transmission mechanism may be disposed at the upper portion of the dehydration tank, and the moving mechanism for moving the scraper of the scraping unit may also be disposed at the upper portion of the dehydration tank. Furthermore, the grinding water introduction pipe may be inserted from the upper portion of the dehydration tank. In other words, in this case, these components are not disposed below the opening provided at the bottom portion of the dehydration tank. Therefore, these components do not hinder the ejection of the processing chips, and the processing chips can be treated well. 
     It is needless to say that the arrangement of the holding unit of the rotation shaft and the rotation transmission mechanism is not limited thereto, and the rotation transmission mechanism may be disposed below the dehydration tank. The moving mechanism for moving the scraper may be disposed inside or at the lower portion of the dehydration tank. In this case, a coupling member for coupling the dehydration tank can be provided at the upper portion of the rotation shaft of the dehydration tank. Accordingly, accumulation of the processing chips that are dropped when the scraper of the scraping unit is operated on the coupling member for coupling the dehydration tank is avoided, and the processing chips can be easily processed. 
     &lt;Notification Unit&gt; 
     For example, the notification unit is provided to notify the operator of various types of information. For example, the notification unit notifies an error of the grinding water treatment device, work information necessary for the operator, and the like. For example, the notification unit may also be used as a monitor (for example, a monitor  12 ) which is an example of a display unit provided in the processing device. Accordingly, even in a case where the centrifugal separator is accommodated inside the table, the necessary information can be notified to the operator by using the display unit which is an example of the notification unit of the processing device. For example, the notification unit is provided to notify the operator of the status in a case where the centrifugal separator does not operate normally. According to this, when the centrifugal separator does not operate normally, the operator is required to take action, and thus, the processing chips can be treated well. 
     EXAMPLE 
     Examples of the present disclosure will be described with reference to the drawings. 
     First Example 
       FIG. 1  is a view illustrating a schematic configuration of the whole of an eyeglasses lens processing apparatus according to the first example. The eyeglasses lens processing apparatus includes a processing device  1  of an eyeglasses lens and a grinding water treatment device  200 . For example, the processing device  1  is placed on the table  20 , and the grinding water treatment device  200  is disposed under the table  20 . 
     &lt;Processing Device of Eyeglasses Lens&gt; 
     A processing mechanism unit  10  is disposed inside the housing of the processing device  1 . The processing mechanism unit  10  is substantially configured with lens chuck shafts (lens rotating shafts)  2 R and  2 L, a carriage unit  3 , a grindstone  5  which is an example of a machining tool, and the like. The lens chuck shafts (lens rotating shafts)  2 R and  2 L hold and rotate a lens LE for eyeglasses. The carriage unit  3  moves the lens chuck shafts  2 R and  2 L relative to the grindstone  5 . The grindstone  5  is attached to a rotation shaft  6  and is rotated by the rotation shaft  6 . Further, a lens refractive surface shape measuring unit  8  is disposed inside the processing device  1 . The lens refractive surface shape measuring unit  8  measures the shape of the refractive surface (front surface and rear surface of the lens) of the lens LE held by the lens chuck shafts  2 R and  2 L. In addition, for the configuration of the processing mechanism unit  10  and the lens refractive surface shape measuring unit  8 , for example, the description of JP-A-2014-4677 is incorporated, and detailed description thereof will be omitted. 
     At the time of peripheral processing of the lens LE, the grinding water is injected from a nozzle  11  to the grinding part of the lens LE and the grindstone  5 , and the grinding unit of the grindstone  5  is cooled. Further, the processing chips generated during the processing is washed away to the bottom portion of a processing chamber  9  by the grinding water. A drainage hose  15  for discharging the grinding water containing processing chips are connected to the bottom portion of the processing chamber  9 . 
     &lt;Grinding Water Treatment Device&gt; 
     The grinding water treatment device  200  includes the centrifugal separator  210  that separates the grinding water discharged from the processing device  1  into processing chips and water. The centrifugal separator  210  is provided with the scraping mechanism unit  600  for scraping out the past chips accumulated inside the dehydration tank  211  (refer to  FIG. 2 ) of the centrifugal separator  210 . Further, the grinding water treatment device  200  includes the water receiving unit  500  that receives water separated and discharged by the centrifugal separator  210 . In addition, there is also a case where the grinding water is completely separated into the water and the processing chips. 
     The grinding water treatment device  200  may include the wash water injection unit  550  for injecting the wash water in order to wash a filter  220  (refer to  FIG. 2 ) provided in the centrifugal separator  210 . Further, the grinding water treatment device  200  may include a pump tank unit  80  for storing the grinding water supplied to the processing device  1 . At the lower portion of the centrifugal separator  210 , the chips receiving unit (bucket)  400  that receives the processing chips separated and ejected by the centrifugal separator is detachably disposed. 
     &lt;Pump Tank Unit&gt; 
     The pump tank unit  80  includes the tank  81  for storing the grinding water and the pump  83  for pumping up the grinding water stored in the tank  81 . Water from the water receiving unit  500  is charged into the tank  81 , and the water separated by the centrifugal separator  210  is reused as grinding water. In the present example, the pump tank unit  80  is a circulation type in which the grinding water is reused. The grinding water pumped up by the pump  83  is guided to the nozzle  11  of the processing device  1  by the hose  85 . 
     &lt;Centrifugal Separator&gt; 
     The configuration of the centrifugal separator  210  will be described with reference to  FIGS. 2 to 5 . In addition,  FIG. 2  is a schematic sectional view for describing a configuration of the water receiving unit  500  in addition to the centrifugal separator  210 . 
     The centrifugal separator  210  includes the dehydration tank  211  into which the used grinding water from the processing device  1  is introduced. The dehydration tank  211  is rotatably supported by the support mechanism  201 . For example, the support mechanism  201  includes four columns  203 , and a top plate  205  is fixed to the four columns  203 . The dehydration tank  211  is disposed below the top plate  205 . The holding member  216  that rotatably holds the rotation shaft  215  of the dehydration tank  211  is fixed to the top plate  205 . The rotation shaft  215  is rotated by a drive source disposed above the dehydration tank  211 . For example, the rotation shaft  215  is rotated by a motor  225  disposed on the top plate  205  via a rotation transmission mechanism  227 . As the rotation transmission mechanism  227 , a mechanism such as a belt, a pulley, or a gear is used. 
     For example, the dehydration tank  211  includes the substantially cylindrical side wall  211   a . In the example, the side wall  211   a  has a conical shape having a larger lower diameter than an upper diameter. The upper wall  211   b  of the dehydration tank  211  has an annular shape and is integrally connected to the side wall  211   a . The holding member  216  is disposed through the opening inside the annular upper wall  211   b.    
     The bottom plate  212  is attached to the bottom portion of the side wall  211   a  of the dehydration tank  211 . The bottom plate  212  configures the bottom portion of the dehydration tank  211 . In addition, the bottom plate  212  may be detachably attached to the side wall  211   a.    
       FIG. 3  is a perspective view describing a configuration of the bottom plate  212 . The rotation shaft  215  is fixed to a center portion  212   a  of the bottom plate  212 . For example, the center portion  212   a  and the lower end of the rotation shaft  215  are fixed. The bottom plate  212  is provided with the opening  230  for allowing the dropped processing chips scraped out by the scraping mechanism unit  600  to pass therethrough and ejecting the processing chips to the outside of the dehydration tank  211 . In the present example, four coupling units  212   c  that couples a peripheral portion  212   b  and the center portion  212   a  of the bottom plate  212  are formed, and four openings  230  are provided therebetween. It is needless to say that the number of coupling units  212   c  and the number of openings  230  are examples, and are not limited thereto. For example, the coupling unit  212   c  extends in the cross direction. In addition, the peripheral portion  212   b  becomes a region where processing chips are accumulated in cooperation with the side wall  211   a  and the upper wall  211   b . With such a configuration, the rotation shaft  215  is rotated by the motor  225 , and accordingly, the dehydration tank  211  is also rotated. In addition, the coupling unit  212   c  may not have to be integrated with the peripheral portion  212   b  and the center portion  212   a , and may be another coupling member for coupling the member of the peripheral portion  212   b  and the member of the center portion  212   a  so as to form the opening  230 . 
     The peripheral portion  212   b , which is the outer region of the opening  230 , is provided with the filter  220  for allowing the water separated from the grinding water to pass therethrough by the rotation of the dehydration tank  211  and discharging the water to the outside of the dehydration tank  211 . In other words, the filter  220  is provided between the opening  230  for ejecting the processing chips and the side wall  211   a  of the dehydration tank  211 . In the example, four elongated holes  212   d  are formed in the peripheral portion  212   b , and the filter  220  is attached to each of the holes  212   d . The filter  220  may be detachably attached to the bottom plate  212 . 
     For example, as the filter  220 , a mesh-like filter that can be used repeatedly is used, but the filter  220  is not limited thereto. The filter  220  may be a non-woven fabric or may be made of another material. For example, the filter  220  may be metal. For example, the filter  220  may be a chemical fiber. For example, when the shape of the filter  220  is a mesh shape, the processing chips adhering to the filter  220  can be efficiently washed. In this case, the filter  220  is washed by, for example, the wash water injection unit  550  described later. For example, the size of the mesh of the filter  220  may be determined according to the size of the processing chips accumulated inside the dehydration tank  211  without passing through the filter  220 . In addition, by disposing the region of the filter  220  so as to extend to the side wall  211   a  of the dehydration tank  211 , water in the vicinity of the side wall  211   a  will pass through the filter  220 . Accordingly, the processing chips accumulated in the dehydration tank  211  can be efficiently dehydrated. 
     &lt;Grinding Water Introduction Unit&gt; 
     The grinding water introduction pipe  150  for introducing the grinding water from the processing device  1  into the dehydration tank  211  passes through the opening of the upper wall  211   b  of the dehydration tank  211 . In other words, the grinding water introduction pipe  150  extends inward from the upper portion of the dehydration tank  211 . An introduction port  150   a  of the grinding water introduction pipe  150  is arranged on the top plate  205 , and the drainage hose  15  extending from the processing device  1  is connected to the introduction port  150   a . An internal pipe  150   b  of the grinding water introduction pipe  150  that enters the inside of the dehydration tank  211  is thinner than the introduction port  150   a . Further, a tip end pipe  150   c  further extending from the internal pipe  150   b  is bent toward an interior side of the side wall  211   a  such that the grinding water is discharged toward the interior side of the side wall  211   a . In other words, a discharge port  151  of the grinding water introduction pipe  150  is directed toward the interior side of the side wall  211   a  such that the advancing direction of the grinding water dropped by gravity is oriented toward the interior side of the side wall  211   a . Accordingly, the grinding water is directed toward the interior side of the side wall  211   a  of the dehydration tank  211  by utilizing the force of the natural drop of the grinding water without using a pump. In addition, it is possible to suppress the direct entrance of the grinding water discharged from the grinding water introduction pipe  150  to the opening  230  for ejecting the processing chips. Further, since the cross-sectional area at the discharge port  151  is smaller than the cross-sectional area at the introduction port  150   a , the force of the grinding water emitted from the discharge port  151  and oriented toward the interior side of the side wall  211   a  is gained, the grinding water is less likely to flow into the opening  230  for ejecting the processing chips, and the centrifugal separation by rotation of the dehydration tank  211  can be performed efficiently. In addition, it is needless to say that a pump may be provided in order to give a force to the grinding water discharged from the discharge port  151 . 
     Further, the discharge port  151  may be arranged on the side wall  211   a  side of the opening  230  for ejecting the processing chips. Accordingly, it is further suppressed that the grinding water enters the opening  230 . 
     Further, as illustrated in  FIG. 4 , the direction of the discharge port  151  may not be the normal direction of the side wall  211   a , but may be a direction in which the discharged grinding water heads along the rotation direction R of the dehydration tank  211 . Accordingly, when the grinding water discharged from the discharge port  151  collides with the side wall  211   a  of the rotating dehydration tank  211 , the accumulated processing chips, or the grinding water collected on the side wall  211   a  side, bouncing and scattering are suppressed. As a result, the entrance of the grinding water into the opening  230  for ejecting the processing chips is further suppressed. 
     Further, the discharge port  151  of the grinding water introduction pipe  150  is arranged above the center of the dehydration tank  211 . Accordingly, the distance until the grinding water discharged from the discharge port  151  reaches the bottom plate  212  of the dehydration tank  211  becomes long, and the grinding water is easily subjected to the centrifugal force due to the rotation of the dehydration tank  211 . Accordingly, the processing chips and the water which are mixed with the grinding water can be separated more efficiently. 
     &lt;Scraping Mechanism Unit&gt; 
     The scraping mechanism unit  600  includes the scraper  601  for scraping out the processing chips accumulated on the interior side of the side wall  211   a ; and the moving mechanism  602  for moving the scraper  601  between the retracted position and the operating position. 
     The scraper  601  is disposed inside the dehydration tank  211 . For example, the scraper  601  has a flat plate shape, and the cutting edge portion  601   a  of the scraper  601  is formed in a shape along the interior side of the side wall  211   a . In addition, the scraper  601  is not limited to a flat plate shape, and may have a shape capable of scraping out the processing chips. A rotation shaft  604  extending above the dehydration tank  211  is attached to the scraper  601 . The rotation shaft  604  is rotatably held by a holding unit  605  mounted on the top plate  205 . Then, the rotation shaft  604  is rotated (forward rotation, reverse rotation) by a motor  603  via the rotation transmission mechanism (belt, pulley, gear, and the like). The motor  603  is attached onto the top plate  205 . In the example, the moving mechanism  602  is configured with the rotation shaft  604 , the holding unit  605 , the motor  603 , and the like. In addition, the moving mechanism  602  of the scraper  601  is not limited to the above-described rotation, and may be a linear movement. 
     For example, the retracted position of the scraper  601  is set to be a position where the scraper  601  does not hit the side wall  211   a  and the accumulated processing chips as illustrated by the dotted line in  FIG. 5  when the dehydration tank  211  is rotated to centrifugally separate the grinding water and the processing chips. In a case of scraping out the processing chips accumulated on the interior side of the side wall  211   a , the scraper  601  is moved to the operating position where the cutting edge portion  601   a  of the scraper  601  is pressed against the side wall  211   a  as illustrated by the solid line in  FIG. 5 . 
     &lt;Water Receiving Unit&gt; 
     The water receiving unit  500  is disposed under the centrifugal separator  210 . The water receiving unit  500  is attached to, for example, the column  203 . The water receiving unit  500  is positioned below the filter  220  to receive the water that has passed through the filter  220  at the bottom portion of the dehydration tank  211 . For example, as the water receiving unit  500 , a U-shaped flow path is arranged in an annular shape. For example, the water receiving unit  500  is disposed corresponding to the arrangement of the filter. In other words, the water receiving unit  500  has a water receiving region capable of receiving the water that passes through the filter  220  and is dropped. The water receiving unit  500  is disposed outside the opening  230 . For example, a side wall  500   a  on the inside (rotation shaft  215  side) of the water receiving unit  500  is arranged outside the opening  230  formed on the bottom plate  212 . Accordingly, the processing chips that pass through the opening  230  are prevented from being mixed into the water receiving unit  500 . Further, the water that has passed through the filter  220  is prevented from flowing into the chips receiving unit  400 . Further, the water that has passed through the filter  220  can flow into the water receiving unit  500 . Further, the upper end of a side wall  500   b  on the outer side of the water receiving unit  500  is provided at a position higher than the bottom portion (bottom plate  212 ) of the dehydration tank  211 . Accordingly, it is possible to suppress the outflow of the water that has passed through the filter  220  from the water receiving unit  500  to the outside of the centrifugal separator  210 . 
     In addition, regarding the arrangement of the water receiving unit  500 , the water receiving unit  500  may be disposed in a region for receiving water that has passed through the filter  220 , that is, at least in a region other than the region where the processing chips scraped out by the scraping mechanism unit  600  pass through the opening  230 . For example, the processing chips scraped out by the scraping mechanism unit  600  are mainly ejected from the vicinity of the position where the scraper  601  is disposed in the opening  230 . Therefore, for example, at a position (for example, 180° opposite to the operating position of the scraper  601 ) away from the scraper  601 , the water receiving unit  500  may be disposed at the part of the opening  230  outside the region through which the processing chips pass. Accordingly, while the entrance of the processing chips scraped out by the scraping mechanism unit  600  into the water receiving unit  500  is suppressed, the entrance of the grinding water introduced from the discharge port  151  of the grinding water introduction pipe  150  into the chips receiving unit  400  can be suppressed. 
     A drainage hole  501  for draining water is provided at a part of the bottom surface  502  of the water receiving unit  500 . The water that has entered the water receiving unit  500  flows into the tank  81  from the drainage hole  501  through the flow path  510 . 
     In addition, the bottom surface  502  of the water receiving unit  500  may be inclined toward the drainage hole  501 . For example, the bottom surface  502  of the water receiving unit  500  is inclined such that 180 degrees opposite side of the drainage hole  501  is the highest. Accordingly, the grinding water flowing into the water receiving unit  500  can be efficiently drained from the drainage hole  501 . 
     &lt;Wash Water Injection Unit&gt; 
     The wash water injection unit  550  is provided in the grinding water treatment device  200  for washing the filter  220  disposed at the bottom portion of the dehydration tank  211 . In  FIG. 1 , the wash water injection unit  550  includes a tank  554  for storing wash water; a pump  551  for suctioning wash water; the nozzle  553  for injecting the wash water toward the filter  220  (refer to  FIG. 2 ); and a pipe  552  that couples the pump  551  and the nozzle  553 . 
     The nozzle  553  is provided at a position where the wash water is ejected from below the filter  220 . In the example, the nozzle  553  is installed on the side wall  500   b  on the outside of the water receiving unit  500 . The tip end port of the nozzle  553  is directed toward the filter  220  (that is, the bottom portion of the dehydration tank  211 ). In addition, the tip end port of the nozzle  553  may be provided so as to eject the wash water in the diagonally downward direction with respect to the filter  220  at a position avoiding the position where the water that has passed through the filter  220  is dropped. In this case, it is suppressed that the water that has passed through the filter  220  directly enters the tip end port of the nozzle  553  when the wash water is not injected. Accordingly, it is possible to suppress the clogging of the nozzle  553  due to fine processing chips that have passed through the filter  220 . The mechanism for suppressing the clogging of the nozzle  553  is not limited to this. For example, the nozzle  553  may be provided with a mechanism which is positioned at the retracted position that is not affected by the water that has passed through the filter  220  during non-washing, and moves to the injection position where the wash water can be ejected toward the filter  220  during the washing. Otherwise, the nozzle  553  may be provided inside the dehydration tank  211 . In this case, the nozzle  553  injects the wash water from above the filter  220 . For example, the nozzle  553  may be attached to a member such as the scraper  601  or the like inside the dehydration tank  211 . 
     At the time of washing the filter  220 , the wash water stored in the tank  554  is suctioned by the pump  551  and injected from the nozzle  553  toward the filter  220  via the pipe  552 . Accordingly, the clogging of the filter  220  is eliminated. In addition, the wash water may be tap water, and the pipe  552  may be connected to a water pipe instead of the tank  554 . 
     &lt;Chips Receiving Unit&gt; 
     Below the opening  230 , the chips receiving unit  400  that receives the processing chips scraped out by the scraping mechanism unit  600  is detachably provided. For example, the chips receiving unit  400  has a size capable of accommodating an amount larger than the amount of the processing chips that can be accumulated in the dehydration tank  211 . Accordingly, the frequency of the work (disposal work) of taking out the processing chips performed by the operator can be reduced, and the troublesome of the operator can be alleviated. Further, a bag may be disposed in the chips receiving unit  400 . Accordingly, the operator can dispose of the processing chips collected inside the bag together for each of the bags, and the burden on the operator can be reduced. 
     &lt;Control Unit&gt; 
       FIG. 6  is a block diagram of a control system in the present example. The eyeglasses lens processing apparatus according to the present disclosure includes the processing device  1  and a control unit  70  for controlling the operation of the grinding water treatment device  200 . It is needless to say that a control unit that controls the operation of the processing device  1  and a control unit that controls the operation of the grinding water treatment device  200  may be provided separately. The control unit  70  is coupled to each of the drive source included in the processing mechanism unit  10  of the processing device  1  and the lens refractive surface shape measuring unit  8 . Further, the control unit  70  is coupled to each of the drive sources (the pump  83 , motor  225 , motor  603 , and pump  551 ) included in the grinding water treatment device  200 . Further, the control unit  70  is coupled to the monitor  12  used as an example of the notification unit. 
     &lt;Notification Unit&gt; 
     The grinding water treatment device  200  may include the monitor  12  used as an example of the notification unit notifying the operator of various types of information. The monitor  12  is connected to the control unit  70  (refer to  FIG. 6 ). For example, in a case where the centrifugal separator  210  does not operate normally due to oscillation or the like, the control unit  70  can notify the operator of an error through the monitor  12  and request a response. 
     In the present example, the monitor  12  is also used as a monitor provided as the notification unit (and an input unit) in the processing device  1 . It is needless to say that the notification unit may not be shared with the notification unit provided in the processing device  1 , but may be provided separately. 
     In addition, the monitor  12  is an example of a member for notifying the operator, and is not limited thereto. For example, the notification unit may be a speaker. In this case, the grinding water treatment device  200  notifies the operator of the error by the voice of the speaker. Further, for example, the notification unit may be a lamp. In this case, the grinding water treatment device  200  notifies the operator of the error by lighting the lamp. Furthermore, the notification unit may be communication means with an external device such as a computer. In this case, the grinding water treatment device  200  notifies the operator of the error by the communication external device. 
     Further, for example, the control unit  70  may notify the operator of an instruction via the notification unit. For example, the control unit  70  may instruct the operator via the monitor  12  to take out the processing chips from the chips receiving unit  400  when the lens is processed by the processing device  1  a predetermined number of times. 
     &lt;Operation&gt; 
     The operations of the processing device and the grinding water treatment device having the above-described configuration will be described. When the lens LE is held by the lens chuck shafts  2 R and  2 L and the operation start signal of the processing device  1  is input, the control unit  70  first operates the lens refractive surface shape measuring unit  8  based on the previously acquired target lens shape, and measures the refractive surface shape of the lens LE. When the measurement of the refractive surface shape of the lens LE is completed, the control unit  70  then drives the pump  83  to control the drive of the carriage unit  3  while injecting the grinding water from the nozzle  11 , and the peripheral edge of the lens LE is ground by the grindstone  5 . The grinding water containing processing chips generated by processing the lens LE is guided to the centrifugal separator  210  by the drainage hose  15  connected to the bottom portion of the processing chamber  9 . 
     Here, the control unit  70  drives the motor  225  so as to rotate the dehydration tank  211  of the centrifugal separator  210  at high speed based on a predetermined operation signal of the processing device  1  before supplying the grinding water (before driving the pump  83 ). Since the dehydration tank  211  is rotated at high speed before the grinding water from the processing device  1  flows into the dehydration tank  211 , it is possible to reduce the inflow of the grinding water into the opening  230  for ejecting the processing chips. For example, as a predetermined operation signal, a trigger signal for starting the processing of the processing device  1  can be used. It is needless to say that the measurement start signal or the measurement end signal of the lens LE by the lens refractive surface shape measuring unit  8  may be used. Otherwise, as a predetermined operation signal, a signal for holding the lens LE on the lens chuck shafts  2 R and  2 L may be used. 
     The grinding water from the drainage hose  15  flows into the introduction port  150   a  of the grinding water introduction pipe  150 , is guided to the inside of the dehydration tank  211  via the internal pipe  150   b  and the tip end pipe  150   c , and is discharged from the discharge port  151  toward the interior side of the side wall  211   a  of the dehydration tank  211 . In the present example, the grinding water introduction pipe  150  is provided such that the grinding water discharged from the discharge port  151  is oriented toward the interior side of the side wall  211   a . Further, the discharge port  151  may be arranged on the side wall  211   a  side of the opening  230 . Accordingly, it is suppressed that the grinding water directly enters the opening  230  provided on the bottom plate  212 . Furthermore, since the cross-sectional area at the discharge port  151  is smaller than the cross-sectional area at the introduction port  150   a , the force of the grinding water oriented toward the interior side of the side wall  211   a  is gained to suppress the entrance of the grinding water into the opening  230 . 
     Further, since the discharge port  151  is directed in a direction in which the discharged grinding water heads along a rotation direction R of the dehydration tank  211  (refer to  FIG. 4 ), bouncing and scattering are suppressed in a case where the grinding water discharged from the discharge port  151  collides with the side wall  211   a , the accumulated processing chips and the like. Accordingly, it is further suppressed that the grinding water enters the opening  230 . 
     In addition, a shutter that can be opened and closed may be provided between the opening  230  and the upper portion of the chips receiving unit  400 . In this case, the shutter is closed except when the processing chips are removed by the scraping mechanism unit  600 , and accordingly, it is possible to suppress the inflow of the grinding water into the chips receiving unit  400  from the opening  230 . 
     The grinding water containing the processing chips introduced into the dehydration tank  211  is separated into the processing chips and water by the centrifugal force caused by the high-speed rotation of the dehydration tank  211 . In a case where the processing chips contained in the grinding water is heavier than water, as illustrated in  FIG. 7A , the processing chips and water are separated such that the processing chips are accumulated first on the side wall  211   a  side and the water is positioned on the inside (rotation shaft  215  side). In  FIGS. 7A and 7B , PW indicates processing chips and GW indicates separated water. 
     Here, in a case where the filter  220  is not provided on the peripheral portion  212   b  of the bottom plate  212 , when the rotation of the dehydration tank  211  stops (or when the dehydration tank  211  rotates at low speed), the water collected inside the dehydration tank  211  flows out from the opening  230  positioned inside the peripheral portion  212   b  and flows into the chips receiving unit  400 . 
     On the other hand, in the present disclosure, by providing the filter  220  on the peripheral portion  212   b  of the bottom plate  212 , it is suppressed that the water collected inside the dehydration tank  211  passes through the filter  220 , is discharged to the outside of the dehydration tank  211 , and enters the opening  230 . In the present example, the water that has passed through the filter  220  enters the water receiving unit  500  provided outside the opening  230  and is reused as grinding water. 
     Further, it has been newly found by the present inventor that there is a case where it is difficult to separate the processing chips and water depending on the material of the lens LE, and the processing chips are lighter than water. The processing chips lighter than water are generated, for example, in a case where the material of the lens LE is thermoplastic such as polycarbonate. Polycarbonate is heavier than water in a state before processing, but it is considered that the processing chips ground by the grindstone  5  are softened by the heat during processing and contain air, and are lighter than water. In a case where the processing chips are lighter than water, water (including a case of grinding water in which the processing chips are not completely separated) is positioned on the side wall  211   a  side as illustrated in  FIG. 7B  by centrifugal separation by rotation of the dehydration tank  211 , and the processing chips will be positioned inside (the rotation shaft  215  side). 
     Here, similar to the description above, in a case where the filter  220  is not provided on the peripheral portion  212   b  of the bottom plate  212 , when the rotation of the dehydration tank  211  stops (or when the dehydration tank  211  rotates at low speed), the processing chips flow out from the opening  230  together with the water collected inside the dehydration tank  211 . In other words, the grinding water containing the processing chips that have not been centrifugally separated flows into the chips receiving unit  400 . 
     On the other hand, in the present disclosure, by providing the filter  220  on the peripheral portion  212   b  of the bottom plate  212 , the water positioned further on the side wall  211   a  side than the processing chips passes through the filter  220  and is discharged to the outside of the dehydration tank  211 . Accordingly, only the processing chips are accumulated inside the dehydration tank  211 . 
     The control unit  70  does not stop the rotation of the dehydration tank  211  immediately after the processing of the lens LE is completed and the supply of the grinding water from the nozzle  11  is stopped, but the drive of the motor  225  is stopped after a certain period of time after the processing of the lens LE is completed, and the rotation of the dehydration tank  211  is stopped. Even after the processing of the lens LE is completed, the dehydration tank  211  is rotated to promote the dehydration of the processing chips accumulated inside the dehydration tank  211 . 
     The processing chips accumulated inside the dehydration tank  211  are ejected from the dehydration tank  211  by operating the scraping mechanism unit  600  by the control unit  70 . In addition, the control unit  70  does not operate the scraping mechanism unit  600  every time the processing of one lens LE is completed, but may operate the scraping mechanism unit  600  when the processing amount of the lens LE reaches a predetermined reference. Accordingly, the processing of the plurality of lenses LE can be continuously and efficiently performed. In addition, the predetermined reference of the processing amount is determined based on, for example, at least one of the number of processed lenses LE, the processing time of the lens LE, and the amount of grinding water used. It is needless to say that the predetermined reference of the processing amount is not limited to these, and various information can be used. In addition, in a case where the control unit  70  is provided separately from the control unit of the processing device  1 , information from the control unit of the processing device  1  is transmitted to the control unit  70 . 
     When the processing amount of the lens LE reaches a predetermined reference, the control unit  70  drives the motor  225  such that the rotation speed of the dehydration tank  211  is lower than the rotation speed at the time of centrifugal separation of the grinding water. Further, the control unit  70  drives the motor  603  and moves the scraper  601  placed at the retracted position to the operating position (the position where the cutting edge portion  601   a  is in contact with the side wall  211   a ) (refer to  FIG. 5 ). In a state where the scraper  601  is positioned at the operating position, the dehydration tank  211  is rotated a plurality of times or for a certain period of time, and accordingly, the processing chips accumulated on the interior side of the side wall  211   a  are scraped off by the scraper  601  and dropped, and are ejected to the outside of the dehydration tank  211  from the opening  230  provided on the bottom plate  212 . The processing chips ejected through the opening  230  is received by the chips receiving unit  400 . In addition, when the work of removing the processing chips accumulated on the interior side of the side wall  211   a  is completed, the control unit  70  controls the drive of the motor  603  and moves the scraper  601  to the retracted position. 
     In addition, the control unit  70  may control the operation of the processing device  1  in a case where the processing chips are removed by the grinding water treatment device  200 . For example, while the processing chips are being removed, the lens processing operation of the processing device  1  may be stopped such that the grinding water does not flow into the dehydration tank  211 . In this case, the control unit  70  may notify the operator via the monitor  12  that the processing chips are being removed. 
     As described above, the processing chips accumulated inside the dehydration tank  211  are automatically ejected to the outside of the dehydration tank  211  by the control unit  70  operating the scraping mechanism unit  600 , and thus, there is no troublesome for the operator to take out the processing chips. Further, the scraping time of the processing chips by the operation of the scraping mechanism unit  600  may be shorter than the processing time of one lens LE. Accordingly, the processing efficiency of the lens LE is not significantly reduced even in the continuous processing of the lens LE at the processing center (lens processing factory that concentrates the processing of eyeglasses lenses). Further, since the amount of the processing chips that can be stored in the chips receiving unit  400  can be larger than the amount of the processing chips accumulated in the dehydration tank  211 , the operator can efficiently dispose of the processing chips collectively without increasing the size of the dehydration tank  211 . 
     The control unit  70  operates the wash water injection unit  550  after removing the processing chips accumulated in the dehydration tank  211  by the scraping mechanism unit  600 . The control unit  70  rotates the dehydration tank  211  while driving the pump  551  to inject the wash water from the nozzle  553  toward the filter  220 . For example, the control unit  70  rotates the dehydration tank  211  a plurality of times or for a certain period of time. Accordingly, even in a case where the filter  220  is clogged with the processing chips, the clogging of the filter  220  is eliminated and the filter  220  can be used repeatedly. 
     In addition, the operation of the wash water injection unit  550  was not executed each time the processing chips in the dehydration tank  211  was removed by the scraping mechanism unit  600 , but the operation of the scraping mechanism unit  600  may be performed a plurality of times. In this case, since the time for stopping the lens processing by the processing device  1  by the operation of the wash water injection unit  550  is reduced, the lens LE can be efficiently processed at the processing center. 
     In the operation of the grinding water treatment device  200  as described above, in a case where the centrifugal separator  210  does not operate normally due to oscillation or the like, the control unit  70  displays an error on the monitor  12  and notifies the operator of the abnormality of the centrifugal separator  210 . In this case, the monitor  12  included in the processing device  1  may also be used. In a case where the centrifugal separator  210  is accommodated inside the table  20 , the operator usually does not directly observe the centrifugal separator  210  while the centrifugal separator  210  is in operation. Therefore, there is a case where the operator does not notice the abnormality of the centrifugal separator  210 . The processing device  1  is mounted on the table  20 , and the operator can observe the monitor  12  of the processing device  1  even while the centrifugal separator  210  is in operation. Accordingly, the operator can easily know the abnormality of the centrifugal separator  210 . 
     Second Example 
     The second example is an example in which the grinding water introduction unit is mainly different from that of the first example. In the second example, due to the different configuration of the grinding water introduction unit, the dehydration tank  211  of the centrifugal separator  210  of the first example, the mechanism for rotating the dehydration tank  211 , the scraping mechanism unit  600 , and the like have a partially different configuration. Hereinafter, the grinding water treatment device according to the second example will be described with reference to  FIGS. 8, 9A, and 9B . In addition, the components having the same functions as those in the first example will be given the same reference numerals, and the detailed description thereof will be omitted. Further, in the following, the differences from the first example will be mainly described. 
     &lt;Centrifugal Separator&gt; 
       FIG. 8  is a view describing a configuration of the grinding water treatment device  200  according to the second example. The dehydration tank  211 B of the centrifugal separator  210 B included in the grinding water treatment device  200  is rotatably supported by the support mechanism  201 . The base  206 B is fixed to the four columns  203  of the support mechanism  201 . The dehydration tank  211 B is rotated by the rotation unit  217 B. The rotation unit  217 B includes the rotation shaft  215 B of the dehydration tank  211 B and the motor  225  (refer to  FIG. 6 ) as an example of a drive source. The rotation shaft  215 B is rotatably held by the holding member  216 B. The holding member  216 B is disposed on the base  206 B and fixed to the base  206 B. The rotation shaft  215 B is rotated by the motor  225  (the motor  225  is not illustrated in  FIG. 8 ) attached under the base  206 B. 
     The side wall  211 Ba of the dehydration tank  211 B has the lower first side wall  211 BaA and the second side wall  211 BaB provided on the first side wall  211 BaA. The first side wall  211 BaA and the second side wall  211 BaB may be integrally formed. The first side wall  211 BaA has a cylindrical surface or a conical surface of which the upper diameter is smaller than the lower diameter. The second side wall  211 BaB has a conical surface of which the upper diameter is smaller than the lower diameter. In addition, an angle β formed by the conical surface of the second side wall  211 BaB with respect to the vertical direction is larger than an angle α formed by the conical surface of the first side wall  211 BaA with respect to the vertical direction. For example, the angle α is formed at 0 to 10 degrees, and the angle β is formed at 20 to 50 degrees. In addition, the upper end of the first side wall  211 BaA and the lower end of the second side wall  211 BaB are formed so as to be continuously connected with the same diameter so as not to cause a step. The upper wall  211 Bb of the dehydration tank  211 B is formed on the second side wall  211 BaB. 
     Similar to the first example, a bottom plate  212 B is attached to the bottom portion of the side wall  211 Ba. The bottom plate  212 B is provided with the opening  230  for ejecting the processing chips scraped out by the scraping mechanism unit  600 B to the outside of the dehydration tank  211 B. In addition, in the centrifugal separator  210 B of the second example, the coupling member  162 B (details will be described later) for coupling the rotation shaft  215 B and the dehydration tank  211 B is provided on the upper portion of the rotation shaft  215 B. Therefore, the bottom plate  212 B omits the center portion  212   a  of the bottom plate  212  and the four coupling units  212   c  illustrated in  FIG. 3  (the explanatory view of the bottom plate  212 B is omitted, and  FIG. 3  is used). Since the bottom plate  212 B does not have the coupling unit  212   c , it is possible to avoid the inconvenience that the processing chips that are dropped when the processing chips are scraped out by the scraping mechanism unit  600 B are accumulated on the coupling unit  212   c.    
     On the bottom plate  212 B, similar to  FIG. 3 , the peripheral portion  212   b , which is the outer region of the opening  230 , is provided with the filter  220  for allowing the water separated from the grinding water to pass therethrough by the rotation of the dehydration tank  211  and discharging the water to the outside of the dehydration tank  211 . 
     In addition, in the second example, since the motor  225  for rotating the rotation shaft  215 B and the rotation transmission mechanism (not illustrated) are attached under the dehydration tank  211 B, a waterproof cover (not illustrated) is disposed thereon. Further, the base  206 B is provided with a hole  207 B for allowing the processing chips that are dropped to pass therethrough when the processing chips are scraped out by the scraping mechanism unit  600 B. 
     &lt;Grinding Water Introduction Unit&gt; 
     On the rotation shaft  215 B of the dehydration tank  211 B, the grinding water receiving unit  153 B that configures the grinding water introduction unit  150 B for introducing the grinding water from the processing device  1  into the dehydration tank  211 B is disposed. The grinding water receiving unit  153 B is disposed inside the dehydration tank  211 B, and is rotated in the same direction as the dehydration tank  211 B by the rotation unit  217 B. In the second example, the rotation unit  217 B is shared with the rotation unit that rotates the dehydration tank  211 B. The rotation unit  217 B rotates the grinding water receiving unit  153 B integrally with the dehydration tank  211 B. On the outer periphery of the grinding water receiving unit  153 B, the discharge opening  160 B for discharging the grinding water toward an interior side of the side wall  211 Ba (in the example, the second side wall  211 BaB) of the dehydration tank  211 B is provided. 
     Above the grinding water receiving unit  153 B, an introduction port  150 Ba for introducing the grinding water discharged from the processing device  1 , that is, an introduction port  150 Ba attached to a top plate  205 B is provided. The top plate  205 B is fixed to the four columns  203 . The drainage hose  15  extending from the processing device  1  is connected to the introduction port  150 Ba. For example, the introduction port  150 Ba is a circular pipe and is arranged concentrically with the rotation shaft  215 B. Further, a lid member  214 B is attached onto the upper wall  211 Bb of the dehydration tank  211 B. The lid member  214 B is formed with a hole into which the introduction port  150 Ba is inserted, and is rotated together with the dehydration tank  211 B. The lid member  214 B reduces the outflow of the grinding water from the top of the dehydration tank  211 B when the grinding water is introduced into the grinding water receiving unit  153 B from the introduction port  150 Ba. In addition, the lid member  214 B may be integrally formed with the upper wall  211 Bb. 
       FIGS. 9A and 9B  are views describing a configuration of the grinding water receiving unit  153 B.  FIG. 9A  is a view in the vicinity of the grinding water receiving unit  153 B in  FIG. 8 , and  FIG. 9B  is a sectional view taken along the line A-A of  FIG. 9A  (sectional view seen from above). For example, the grinding water receiving unit  153 B includes the bottomed water receiving plate  155 B that receives the grinding water charged from the introduction port  150 Ba. The water receiving plate  155 B is attached onto the rotation shaft  215 B. The water receiving plate  155 B is rotated together with the rotation shaft  215 B, and accordingly, the water receiving plate  155 B is rotated integrally with the dehydration tank  211 B. For example, the water receiving plate  155 B is formed in a disk shape concentric with the rotation shaft  215 B. Further, the height of the upper surface (surface receiving the grinding water) of the water receiving plate  155 B is positioned above the first side wall  211 BaA and between the heights of the second side wall  211 BaB. For example, the upper surface of the water receiving plate  155 B is positioned at the center of the height width of the second side wall  211 BaB. Accordingly, the grinding water charged on the upper surface of the water receiving plate  155 B is oriented toward the second side wall  211 BaB when the grinding water is emitted from the water receiving plate  155 B by the centrifugal force (detailed operation will be described later). 
     Further, for example, the water receiving plate  155 B is formed in a disk shape having a diameter larger than the diameter of the introduction port  150 Ba. In addition, the introduction port  150 Ba is positioned on the water receiving plate  155 B, and it is sufficient that the grinding water discharged from the processing device  1  can be introduced onto the water receiving plate  155 B, and may not necessarily be arranged concentrically with the rotation shaft  215 B. Further, the upper surface shape of the water receiving plate  155 B is not limited to the horizontal plane shape. For example, the upper surface shape of the water receiving plate  155 B may be a conical surface shape having a convex center portion. For example, the inclination of the conical surface with respect to the horizontal direction may be 40 degrees or less, and preferably 10 to 20 degrees. In this case, it is possible to suppress that the grinding water flowing from the introduction port  150 Ba hits the conical surface of the water receiving plate  155 B and is bounced and scattered upward, and the grinding water is easily directed in the lateral direction due to the action of the centrifugal force. 
     &lt;Coupling Structure Between Dehydration Tank and Rotation Shaft&gt; 
     Further, the centrifugal separator  210 B is provided with the coupling member  162 B for coupling the rotation shaft  215 B and the dehydration tank  211 B in order to rotate the dehydration tank  211 B integrally with the rotation shaft  215 B. In the second example, a plurality (for example, four) of coupling members  162 B for coupling the water receiving plate  155 B and the dehydration tank  211 B are provided between the water receiving plate  155 B and the dehydration tank  211 B. In other words, in the disclosure of the second example, the dehydration tank  211 B and the water receiving plate  155 B are rotated integrally with the rotation shaft  215 B with the water receiving plate  155 B interposed therebetween. In the disclosure of  FIGS. 8, 9A, and 9B , the coupling member  162 B is provided at a position where the upper surface of the water receiving plate  155 B and the upper wall  211 Bb (which may further include the second side wall  211 BaB) are coupled. In addition, the discharge opening  160 B for discharging the grinding water toward the interior side of the side wall  211 Ba is formed between each of the plurality of coupling members  162 B. In the disclosure of  FIGS. 8, 9A, and 9B , the discharge opening  160 B is provided so as to emit the grinding water in the horizontal direction, but may be provided so as to emit the grinding water in the diagonally upward direction. 
     &lt;Scraping Mechanism Unit&gt; 
     The scraping mechanism unit  600 B includes the scraper  601  for scraping out the processing chips accumulated on the interior side of the side wall  211 Ba. The moving mechanism  602 B for moving the scraper  601  between the retracted position and the operating position uses the rotary moving mechanism in the first example, but uses the linear moving mechanism in the second example. The moving mechanism  602 B is attached to the holding member  216 B inside the dehydration tank  211 B, and by linearly moving two support members  607 B supporting the scraper  601  in the horizontal direction, the scraper  601  is moved between the retracted position and the operating position. The moving mechanism  602 B includes the motor  603  (refer to  FIG. 6 ) which is an example of a drive source for moving the support member  607 B. 
     In addition, similar to the first example, the chips receiving unit (bucket)  400  for receiving the processing chips is detachably disposed at the lower portion of the centrifugal separator  210 . In the second example, the base  206 B to which the holding member  216 B is fixed is disposed between the centrifugal separator  210  and the chips receiving unit  400 , but the hole  207 B for allowing the processing chips to pass therethrough may be formed on the base  206 B so as to correspond to the retracted position and the operating position of the scraper  601 . 
     Operation of Second Example 
     The operation of the grinding water treatment device according to the second example will be described. Here, the operation of the points different from those of the first example will be mainly described. 
     The grinding water from the processing device  1  is introduced (charged) into the grinding water receiving unit  153 B from the introduction port  150 Ba via the drainage hose  15 . In addition, before the grinding water is introduced into the grinding water receiving unit  153 B, the water receiving plate  155 B of the grinding water receiving unit  153 B is rotated at high speed together with the dehydration tank  211 B based on a predetermined operation signal of the processing device  1 . The grinding water introduced from the introduction port  150 Ba is received by the water receiving plate  155 B. At this time, since the water receiving plate  155 B is rotated in the same direction as the dehydration tank  211 , the centrifugal force also acts on the grinding water received by the water receiving plate  155 B, and the grinding water is sprinkled in the radial direction. Then, the grinding water is repelled from the discharge opening  160 B and is vigorously discharged (emitted) to the outside of the grinding water receiving unit  153 B, and at the same time, a force acts on the grinding water in the rotation direction of the water receiving plate  155 B. In other words, in a case where the water receiving plate  155 B is rotated integrally with the dehydration tank  211 , substantially the same rotational force acts on the grinding water discharged from the discharge opening  160 B in the same rotation direction as the rotation of the dehydration tank  211 B. The water receiving plate  155 B is rotated at high speed at the same rotation speed as the dehydration tank  211 B for separating the grinding water into processing chips and water, and accordingly, the grinding water is discharged from the discharge opening  160 B at speed faster than the falling speed due to gravity in the first example. 
     Here, in the grinding water introduction unit  150 B of the second example, as described above, substantially the same rotational force acts on the grinding water discharged from the discharge opening  160 B in the same direction as the rotation of the dehydration tank  211 B. Therefore, when the grinding water collides with the side wall  211 Ba (the wall of the grinding water collected in the side wall  211   a ) that is rotated at high speed, the generation of splashes of the grinding water is further suppressed with respect to the configuration of the grinding water introduction pipe  150  of the first example. In addition, by suppressing the generation of splashes of the grinding water, the possibility that the unfiltered grinding water flows out from the opening  230  for ejecting the processing chips is reduced, and the possibility that the grinding water flows into the chips receiving unit  400  is also reduced. Further, by suppressing the generation of splashes of the grinding water, the inhibition of the centrifugal separation between the processing chips and water related to the grinding water accumulated on the side wall  211 Ba can be further suppressed with respect to the configuration of the first example. Accordingly, the processing chips and water are efficiently centrifugally separated by the dehydration tank  211 B. 
     In addition, furthermore, in an example of the side wall  211 Ba of the dehydration tank  211 B disclosed in  FIG. 8 , the angle β formed by the conical surface of the second side wall  211 BaB with respect to the vertical direction is larger than the angle α formed by the conical surface of the first side wall  211 BaA with respect to the vertical direction. Further, the height of the upper surface (surface receiving the grinding water) of the water receiving plate  155 B is positioned above the first side wall  211 BaA. Therefore, the grinding water discharged from the discharge opening  160 B tends to collide with the second side wall  211 BaB. The grinding water that has collided with the second side wall  211 BaB flows toward the first side wall  211 BaA having a diameter larger than that of the second side wall  211 BaB due to the centrifugal force of the dehydration tank  211 B. Accordingly, the processing chips and water are also efficiently separated by the dehydration tank  211 B, and the processing chips are deposited on the first side wall  211 BaA side. 
     Further, in a case where the amount of grinding water introduced from the introduction port  150 Ba is small, in the disclosure of the first example, the force of the grinding water toward the interior side of the side wall  211   a  side is weak (the speed is slow), and the grinding water tends to fall to the bottom plate  212  side. On the other hand, in the grinding water introduction unit  150 B of the second example, even in a case where the amount of grinding water is small because the centrifugal force also acts on the grinding water received by the water receiving plate  155 B flowing in from the introduction port  150 Ba, the force of the grinding water discharged from the discharge opening  160 B and blown toward the interior side of the side wall  211 Ba is strong (the speed is high), and the grinding water is suppressed from falling directly toward the bottom plate  212 B. Accordingly, even in a case where the amount of grinding water is small, the processing chips and water can be efficiently separated by the dehydration tank  211 B that is rotated at high speed. 
     The grinding water collected inside the dehydration tank  211 B (the interior side of the side wall  211 Ba) is separated into the processing chips and water by the centrifugal force of the dehydration tank  211 B. Then, as illustrated in  FIGS. 7A and 7B , the water separated from the grinding water passes through the filter  220  provided at the bottom portion of the dehydration tank  211 B and is discharged to the outside of the dehydration tank  211 B. Accordingly, only the processing chips are accumulated inside the dehydration tank  211 B. 
     When the processing amount of the lens LE reaches a predetermined reference, the scraping mechanism unit  600 B is driven by the control of the control unit  70 , and accordingly, the scraper  601  placed at the retracted position is moved to the operating position. In this state, as the dehydration tank  211 B is rotated, the processing chips accumulated on the interior side of the first side wall  211 BaA are scraped off by the scraper  601  and dropped, and are ejected to the outside of the dehydration tank  211 B from the opening  230  provided on the bottom plate  212 B. 
     The grinding water treatment device  200  of the second example includes the water receiving unit  500  and the wash water injection unit  550 , but the operation thereof is basically the same as that of the first example and is omitted. 
     Modification Example of Second Example 
     The arrangement of the coupling member  162 B disclosed in  FIGS. 9A and 9B  is not limited to the above as long as the dehydration tank  211 B can be rotated integrally with the rotation shaft  215 B. For example, the coupling member  162 B may be attached to the rotation shaft  215 B. Further, the coupling member  162 B may be separated from the grinding water receiving unit  153 B (water receiving plate  155 B). For example, similar to the first example, the coupling member  162 B may be provided on the bottom plate  212 B of the dehydration tank  211 B. In a case where the coupling member  162 B is separated from the grinding water receiving unit  153 B, the discharge opening  160 B can be provided on the entire circumference of the water receiving plate  155 B. As illustrated in  FIGS. 9A and 9B , in a case where the coupling member  162 B is provided on the water receiving plate  155 B, the coupling member  162 B serves as a barrier, and there is a possibility that the grinding chips mixed into the grinding water stay on the water receiving plate  155 B. On the other hand, when the discharge opening  160 B is provided on the entire circumference of the water receiving plate  155 B, it is possible to further reduce the staying of grinding chips on the water receiving plate  155 B. 
     Although the typical examples of the present disclosure have been described above, the present disclosure is not limited to the examples illustrated here, and various modifications can be made within the scope of making the technical idea of the present disclosure the same.