Patent Publication Number: US-2022211244-A1

Title: Ultrasonic Spoon Washing Apparatus and Method

Description:
TECHNICAL FIELD 
     The present disclosure relates to ultrasonic spoon washing apparatus and method, which use ultrasonic waves generated by one or more ultrasonic oscillators provided on a vertical side wall of polygonal surfaces of a wash tub so that spoons (collectively referred to as various types of “food utensils” such as spoons, chopsticks, forks, knives, and the like used to eat food) accommodated in a spoon accommodation container having a spoon support part rotating forward/in reverse maybe very efficiently and conveniently washed while the number of revolutions changes for each washing stage. 
     BACKGROUND ART 
     In general, a large amount of spoons are used in places where communal feeding is required, such as hotels, restaurants, schools, hospitals, company cafeterias, and the like where many people eat. Meanwhile, a large number of spoons used in this way take a lot of time to wash after use. That is, conventionally, spoon washing is performed manually one by one, so working efficiency is remarkably reduced due to an increase of the working time, and simple water washing is performed, causing many problems to occur in hygiene, for example, clean washing is not able to be performed. 
     In consideration of such points, some spoon washing machines configured to wash the spoon have been proposed conventionally, but a structure is complicated, washing water is wasted severely, and washing power is also unreliable, so use thereof has not been invigorated. 
     To describe more specifically, the spoon washers having been conventionally provided and used include mainly: a conveyor-type spoon washing method, in which spoons are transported by a conveyor belt on which the spoons are loaded, thereby being washed by a brush rotating at a position thereabove and by high-pressure washing water sprayed thereon; and a method in which washing water and spoons are accommodated in a wash bucket, and then the spoons are washed by oscillating the wash bucket or by spraying the high-pressure washing water from thereabove while swinging the wash bucket. 
     The spoon washing machines of the conveyor belt transfer method may be exemplified in Korean Patent No. 10-1288446 and Korean Patent No. 10-1330794. Here, Korean Patent Registration No. 10-1288446 is characterized in that spoons or chopsticks inserted along a slide are transported on a vertical conveyor belt, are washed while passing between upper and lower rollers with brushes formed on outer circumferential surfaces, respectively, and are discharged. In this case, a chopstick passage hole is formed in the discharge part so that only chopsticks narrower than the spoon pass through the chopstick hole, thereby separating and storing the spoons and chopsticks. Meanwhile, Korean Patent No. 10-1330794 is configured to include: a first washing part configured to emit air bubbles or ultrasonic waves to an accommodation bucket to soak and wash spoons and at the same time to immerse the spoons; a washing part configured to wash the spoons by spraying a washing liquid by injection nozzles, which are formed on upper and lower sides of the transfer conveyor and are configured to spray the washing liquid by a washing pump on an upper part of the transfer conveyor transporting the firstly washed spoons; a rinsing part formed with rinsing nozzles on the upper and lower sides of the transfer conveyor to spray a rinsing liquid and formed with a rinsing bucket on a lower side thereof; and a drying part configured to remove moisture by blowing wind on the spoons transported passing through the rinsing part. However, the spoon washing device of the conveyor transfer method as described above has drawbacks, for example, as follows: a surface that is placed on the conveyor as the spoon is transported on the conveyor, that is, the bottom of the spoon, has difficulty to contact with the washing liquid and the brushes, whereby washing power is reduced; waste of washing water due to spraying of washing water is severe; and in particular, the device is complicated due to a large number of components, and a spoon washer is enlarged, thus limiting the installation space. 
     In addition, as another method of washing spoons, Korean Patent No. 10-1148849 may be mentioned. In this method, a guide rail and a carriage horizontal operating bar are provided on a top part of a pedestal. Here, the carriage horizontal operating bar is fixed to one side of a carriage in a horizontal direction and passes through a horizontal guide block, wherein the carriage is disposed at an inside of a wash bucket that has the horizontal guide block on a side wall of one side thereof. Meanwhile, a motor is mounted inside the pedestal and disposed such that a direction of a motor shaft is parallel to a vertical direction. In addition, a rotating disk is fixedly installed on the motor shaft. At this point, one side of the rotating disk and the carriage horizontal operating bar passed through the horizontal guide block are coupled to each other in a movable state. The method is configured such that by performing reciprocating motion according to the horizontal stroke operation of the carriage, the spoons mounted inside the wash container are washed with washing water sprayed through nozzles, or the spoons are immersed in the washing water and washed by applying oscillations shaking into a straight line of left and right thereto. Compared to the conventional conveyor belt type, it consists of a simpler washing configuration, so there is an advantage that the product can be miniaturized. However, it is difficult to align the spoons put in the wash bucket and the spoons are washed by a relatively simple process, so the reliability of washing is reduced. Furthermore, when washing is performed by spraying washing water, there is a problem in that washing water is severely wasted. 
     As a way to solve some of the problems of the conventional spoon washers, recently, washing machines configured to wash various fruits or the spoons using ultrasonic waves have been proposed. 
     As is well known, ultrasonic washing uses a sound pressure effect of ultrasonic waves and a cavitation effect to wash by removing foreign substances attached to surfaces of various objects. The cavitation is accompanied by micro-agitation occurring according to the oscillation of the bubble and by chemical and thermal actions due to the destruction of the bubble. The combination and repetition of such reactions increase the promotion and dispersion actions of chemical reactions in the washing solution, whereby precise washing is achieved by removing foreign substances attached to the object to be washed. 
     Looking at the conventional ultrasonic washers that have been provided to wash spoons, Korean Utility Model No. 20-0441856 and Korean Patent No. 10-1166436 may be mentioned. 
     Korean Registered Utility Model No. 20-0441856 is intended to provide an ultrasonic washing device so that one ultrasonic washing device may be used in a variety of ways in a kitchen for various purposes, wherein the ultrasonic washer may be configured to be separable from a casing and may also be configured such that a spoon sterilizer box may be installed on one side and a cordless electric kettle may be used on an opposite side. In order to achieve such objectives, the ultrasonic washer is configured to wash the object to be washed by ultrasonic waves generated from the washing water during operation of the ultrasonic oscillator, the ultrasonic washer including: an ultrasonic washing box provided with a washing room, which has one openable lid and is configured to receive the washing water, wherein a drain hole, which is to be opened to the outside and configured to drain the washing water, is installed in addition to the ultrasonic oscillator, at a bottom of the washing room; a casing detachably coupled to the ultrasonic washing box, provided with a drain pipe coupled to communicate with the drain hole at an inside thereof, and also provided with a control panel, which is configured to operate the ultrasonic oscillator and installed on a front surface thereof; and a connection means configured to electrically connect the ultrasonic oscillator to the control panel by being installed at portions facing the casing and the ultrasonic washing box, respectively. 
     In addition, Korean Patent No. 10-1166436 is intended to improve a washing efficiency of spoons by allowing washing to be automatically performed according to an operation of the ultrasonic sensor while rotating of the spoons is performed by inserting the spoons into a separate rotation container. In order to achieve such objectives, an ultrasonic washing machine is configured to include: an inner water tub provided at an upper portion of a washing machine body to accommodate washing water at a predetermined level; a spoon accommodation container configured to be rotatable with a rotation shaft as a center inside the inner water tub and formed in a cylindrical shape formed with a plurality of perforations on an outer wall surface; a driving motor mounted on one side of the washing machine body to transmit a rotational force to the spoon accommodation container; and a plurality of ultrasonic sensors configured to generate ultrasonic waves by being provided on a bottom surface of the inner water tub. 
     However, in all of the above-described conventional ultrasonic washing machines, the ultrasonic washing operation is performed on the material to be washed in a state in which the ultrasonic oscillators or the ultrasonic sensors are installed on the floor of the washing room or inner water tub. Therefore, as the ultrasonic waves are always generated in one direction, the washing efficiency is lowered and inefficient, and as the washing machines have an unnecessary volume, it is difficult to avoid structural problems that result in a large amount of water consumption. 
     DISCLOSURE 
     Technical Problem 
     Accordingly, the present disclosure has been made keeping in mind the above problems occurring in the prior art, and an objective of the present disclosure is to provide an ultrasonic spoon washing apparatus and method. In the present disclosure, an inside of a wash tub is formed with a vertical sidewall of polygonal surfaces to minimize a volume with respect to a spoon support part installed to rotate forward/in reverse inside the wash tub, and at the same time, ultrasonic oscillations are generated in various directions through one or more ultrasonic oscillators installed on each surface of the vertical side wall to be disposed close to the support part. Accordingly, the apparatus and method are capable of minimizing waste of washing water and maximizing a washing efficiency. 
     Another objective of the present disclosure is to provide the ultrasonic spoon washing apparatus and method that are capable of further maximizing convenience and efficiency of the washing in such a way that the spoons to be washed in the wash tub are washed step-by-step by water and ultrasonic waves in a state of being placed in the spoon accommodation container of the spoon support part and are allowed to be dried after rinsing. 
     Technical Solution 
     In order to accomplish the above objectives, there may be provided an ultrasonic spoon washing apparatus according to the present disclosure, the apparatus including: a frame body; a wash tub which is mounted inside the frame body, of which a vertical side wall of polygonal surfaces extends upward around a bottom surface thereof so that a washing space having a predetermined depth is provided, in which washing water is automatically supplied and blocked through a washing water supply part controlled by means of highest and lowest water level detection sensors, and in which a detergent is also automatically supplied and blocked through a detergent supply part; one or more ultrasonic oscillators provided on an outer side of the vertical side wall comprising the polygonal surfaces of the wash tub; a forward/reverse rotation support part mounted vertically in a center of an inside of the wash tub so as to be rotatable forward/in reverse and comprising a support shaft axially installed by passing through to an inside of the wash tub in order to rotate forward/in reverse through power transmitted from a motor and a rotation support pipe installed vertically inside the wash tub in order to rotate forward/in reverse with respect to the support shaft, wherein the rotation support pipe is formed of polygon so as to rotate forward/in reverse together with the spoon support part mounted thereon without rotating idle one another when the spoon support part rotates forward/in reverse; a spoon support part comprising a holder for detachably supporting a fitting pipe so as to be rotatable forward/in reverse with respect to the rotation support pipe of the forward/reverse rotation support part and a spoon accommodation container supported and mounted inside the holder so as to be withdrawable therefrom; a rinsing water supply part configured to spray, after ultrasonic spoon washing using the washing water and washing water draining, the rinsing water, having been heated to a proper temperature (80˜85° C.) in a rinsing tank, together with a rinsing aid from above a top of the spoon support part rotating forward/in reverse through at least one nozzle formed in an injection pipe so as to rinse the spoons that have been completely washed; and a wastewater and foreign material discharge part configured to discharge, to the outside, the wastewater and foreign materials generated during a spoon washing and rinsing process, wherein the wastewater and foreign materials discharged in the process of washing and rinsing the spoon, respectively, are collected in one water collecting pipe through the drain pipes connected to the wash tub and the rinsing tank of the rinsing water supply part, respectively, including the wastewater and foreign material discharge part, and are discharged to the outside through one discharge pipe. 
     According to the present disclosure, the vertical side wall of polygonal surfaces of the wash tub may be made within a range of a hexagonal shape to a dodecagonal shape. 
     According to the present disclosure, the forward/reverse rotation support part may be configured to rotate forward/in reverse at a medium speed during washing with washing water and detergent, at a low speed during ultrasonic washing, at a medium speed during rinsing, and at a high speed during drying according to a washing step of the spoons placed in a spoon accommodation container of the spoon support part that is supported and mounted thereon. 
     According to the present disclosure, the wastewater and foreign material discharge part may be installed passing through a bottom part of the wash tub in a state in which one end thereof positioned inside the wash tub protrudes by a predetermined height from a bottom of the wash tub. 
     According to the present disclosure, the spoon accommodation container of the spoon support part may be divided in a state of being half and configured to be supportedly mounted to be withdrawable with respect to the holder, and the spoon accommodation container may be partitioned into at least one accommodation space. 
     According to the present disclosure, each spoon accommodation container of the spoon support part may be individually divided and supportedly mounted to be withdrawable, with respect to the holder. 
     According to the present disclosure, each spoon accommodation container of the spoon support part may be divided individually but integrally fixedly installed, with respect to the holder. 
     According to the present disclosure, the fitting pipe and the spoon accommodation container of the spoon support part may further be provided with a handle for detaching manipulation and a handle for pulling-out, respectively. 
     According to the present disclosure, the holder of the spoon support part may further be provided with a safety net on a top side thereof. 
     There may be provided an ultrasonic spoon washing method according to the present disclosure, the method including: primarily washing the spoons placed in the spoon accommodation container using washing water and detergent, while washing water and an appropriate amount of the detergent are supplied to the wash tub having a vertical side wall made of polygonal surfaces, and at the same time, the spoon support part, which is detachably mounted on the rotation support pipe of the forward/reverse rotation support part, is rotated forward/in reverse at a medium speed; secondarily washing the spoons using ultrasonic waves, wherein, when the washing water in the wash tub reaches the highest water level, the spoon support part, mounted on the rotation support pipe of the forward/reverse rotation support part, is rotated forward/in reverse from a medium speed to a low speed and, at the same time, the ultrasonic oscillators, mounted on the outside of the vertical sidewall of the wash tub, are operated; discharging the wastewater including the foreign materials in the wash tub to the outside through the wastewater and foreign material discharge part after the primarily and secondarily washing of the spoons is completed; rinsing the spoons accommodated in the spoon accommodation container by rotating the spoon support part forward/in reverse at the medium speed at the same time when draining of the wastewater and foreign materials are completed through the wastewater and foreign material discharge part, wherein, at the same time, in a state in which the wastewater and foreign material discharge part is open, the rinsing water, which has been heated to a high temperature (80-85° C.) in the rinsing tank of the rinsing water supply part, is sprayed evenly together with the appropriate amount of the rinsing aid from above the top of the spoon support part through at least one nozzle formed in an injection pipe; and drying the spoons while rotating the spoon support part forward/in reverse at the high speed again so that the water attached to the spoon accommodated in the spoon accommodation container is removed after the rinsing is completed. 
     Advantageous Effects 
     As described above, according to the present disclosure, the vertical side wall of the wash tub is formed of polygonal surfaces to allow the ultrasonic oscillators to be disposed close with respect to the spoon support part, so that ultrasonic waves are generated in various directions at positions close to the spoon support part through one or more ultrasonic oscillators installed on the polygonal surfaces and, at the same time, a volume inside the wash tub is minimized, thereby minimizing an amount of washing water consumption while maximizing washing efficiency. 
     According to the present disclosure, the effect to increase the efficiency of spoon washing step-by-step can be provided by varying the forward/reverse rotation speed of the spoon support part installed rotatably in a forward/reverse direction in the wash tub according to the washing step. 
     According to the present disclosure, drying is allowed to take place through a process in which the spoon support part is rotated at a high speed after ultrasonic cleaning and rinsing, thereby providing the effect of allowing spoons to be used immediately after taking out the spoons from the spoon support part without a separate water removal operation. 
     According to the present disclosure, through a structure of the spoon accommodation container or a structure of a handle for pulling-out of the spoon support part, it is possible to easily make the spoon arrangement for washing and to conveniently perform the external withdrawal operation of the spoon accommodation container or a holder before and after washing. 
     According to the present disclosure, by collecting and discharging various kinds of wastewater or foreign materials in one water collecting pipe, it is possible to provide an advantage of simplifying a system for discharging the wastewater or foreign materials. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG. 1  is a view showing a front structure according to the present disclosure. 
         FIG. 2  is a view showing a top surface structure according to the present disclosure. 
         FIG. 3  is a view showing a left side structure with reference to  FIG. 1  according to the present disclosure. 
         FIG. 4  is a view showing a right side structure with reference to  FIG. 1  according to the present disclosure. 
         FIG. 5  is an extracted view showing a structure of a forward/reverse rotation support part according to the present disclosure. 
         FIG. 6  is an extracted view showing a structure of a rinsing water supply part according to the present disclosure. 
         FIG. 7  is an extracted view showing a structure of a rear surface of a wash tub according to the present disclosure. 
         FIGS. 8A and 8B  are views showing disassembled and assembled states of a spoon support part, respectively, according to an embodiment of the present disclosure. 
         FIGS. 9A and 9B  are views showing disassembled and assembled states of a spoon support part, respectively, according to another embodiment of the present disclosure. 
         FIGS. 10A and 10B  are views showing disassembled and assembled states of a spoon support part, respectively, according to still another embodiment of the present disclosure. 
         FIG. 11  is a view showing an assembled state of the spoon support part according to still another embodiment according to the present disclosure. 
         FIG. 12  is a view showing an assembled state of the spoon support part according to still another embodiment according to the present disclosure 
     
    
    
     BEST MODE 
     Hereinafter, exemplary embodiments according to the present disclosure will be described in more detail with reference to the accompanying drawings. 
     With reference to  FIGS. 1 to 12 , a spoon washing apparatus according to the present disclosure largely includes a frame body  10 , a wash tub  20 , ultrasonic oscillators  30 , a forward/reverse rotation support part  40 , a spoon support part  50 , a wastewater and foreign material discharge part  60 , and a rinsing water supply part  70 . 
     The frame body  10  is equipped with various devices and may be equipped with a movement prevention device having a function of preventing arbitrary movement or of height adjustment when equipment is completed, including wheels for movement, at a lower portion thereof. 
     The wash tub  20  is mounted inside the frame body  10 . The wash tub  20  has a vertical side wall  23  of polygonal surfaces extendedly formed upward with a bottom surface  22  as a center so as to provide a washing space  21  having a predetermined depth and has a shape open upward. 
     In addition, the wash tub  20  may be covered with a cover  12  that is connected to the frame body  10  and configured to be manipulated to be opened and closed in one direction. 
     In the present disclosure, the reason for forming the vertical side wall  23  of the wash tub  20  in polygonal surfaces is not only to facilitate installation of the ultrasonic oscillator by sufficiently taking into account that it is considerably difficult to mount the ultrasonic oscillator  30  on a curved surface when the wash tub  20  is formed in a circular type but also to reduce a volume with respect to the circular-type spoon support part  50  mounted inside the wash tub  20  to a minimum. Accordingly, this enables efficient washing while reducing wasting of washing water. 
     To this end, the vertical side wall  23  may be made of a polygonal shape within a range of between a hexagonal shape and a dodecagonal shape. In addition, it may be an octagonal shape as best. The reason is that by configuring the vertical side wall  23  in the octagonal shape, there is a structural advantage in that a volume of the washing space may be minimized by allowing the wall to be close to the spoon support part  50  made of a circular type. In addition, when the vertical side wall is formed to have no greater than a pentagonal shape, there is a problem in that an unnecessary volume in the wash tub  20  is provided compared to the shape of the spoon support part  50 , thereby causing waste of washing water. 
     In the washing space  21  of the wash tub  20 , washing water is automatically supplied and blocked through a washing water supply part  26  configured to be controlled by means of highest and lowest water level detection sensors  24  and  25 , and an appropriate amount of detergent is automatically made to be supplied and blocked through the detergent supply part  27 . The appropriate amount of detergent supplied through the detergent supply part  27  may be controlled to be supplied and blocked by a timer. 
     The washing water supply part  26  and the detergent supply part  27  are disposed on any one surface of the vertical side wall made of polygonal surfaces. At this time, the washing water supply part  26  configured to supply and block the washing water to the washing space  21  may be installed to be disposed above the highest water level detection sensor  24 , whereby the washing water is supplied from the uppermost side of the washing space  21 . 
     The ultrasonic oscillators  30  configured to generate ultrasonic waves are mounted on outer peripheral surfaces of the vertical side wall  23  of the wash tub  20 . One or more ultrasonic oscillators may be installed on each surface other than the surface on which the washing water supply part  26  is disposed. 
     The ultrasonic oscillators  30  disposed outside the polygonal surfaces of the vertical side wall  23  may be variously installed according to working conditions. 
     The ultrasonic oscillators  30  may be installed on the surfaces of the vertical side wall  23  opposite to each other so that the ultrasonic waves are generated in directions facing each other, but not limited thereto, and may be selectively installed as needed. 
     In the case of the present disclosure, except for the surface on which the washing water supply part  26  is disposed and the surface corresponding thereto so that ultrasonic spoon washing is performed, at least six ultrasonic oscillators  30  are mounted on each of the remaining surfaces of the vertical side wall  23  (see  FIG. 2 ). 
     When mounting the ultrasonic oscillators  30  on the outside of the corresponding surfaces of the vertical side wall  23  made of the polygonal surfaces as described above, respectively, as the ultrasonic waves are generated at various angles, the efficiency of the ultrasonic spoon washing may be remarkably increased as compared to conventional ultrasonic waves that are limitedly generated in only one direction. 
     Inside the wash tub  20 , a rotation support pipe of the forward/reverse rotation support part  40  is axially installed so as to be rotatable forward/in reverse. 
     The forward/reverse rotation support part  40  includes: a support shaft  42  axially installed by passing through to an inside of the wash tub  20  in order to rotate forward/in reverse through power transmitted from a motor  41 ; and a rotation support pipe  43  installed vertically inside the wash tub in order to rotate forward/in reverse with respect to the support shaft. In this case, the rotation support pipe  43  may be formed in a polygonal shape so as to rotate forward/in reverse together with the spoon support part  50 , which is supported and mounted thereon, without rotating idle one another when the spoon support part  50  rotates forward/in reverse. 
     According to the present disclosure, the rotation support pipe  43  of the forward/reverse rotation support part  40  is configured to be controlled according to a washing step of the spoons placed in a spoon accommodation container of the spoon support part  50  that is supported and mounted thereon. That is, the rotation support pipe  43  is controlled to rotate forward/in reverse at a medium speed during washing with washing water and detergent, at a low speed during ultrasonic washing, at a medium speed during rinsing, and at a high speed during drying. 
     Here, a forward/reverse rotation speed of the rotation support pipe  43  may be set approximately at 20 to 30 times per minute in the case of the medium speed, 5 to 10 times in the case of the low speed, and 50 to 60 times in the case of the high speed. 
     Therefore, according to the present disclosure, it becomes possible to make that in a process of first washing the spoons by adding the washing water or detergent, the spoon support part  50  is rotated forward/in reverse at the medium speed for the first washing, for second washing using the ultrasonic waves, the spoon support part  50  is rotated at the low speed to maximize an effect of washing foreign materials by the ultrasonic waves, during rinsing, the spoon support part  50  is rotated forward/in reverse at the medium speed again to perform rinsing, and during drying, the spoon support part  50  is rotated forward/in reverse at the high speed to forcibly remove moisture from the spoons. 
     The spoon support part  50  includes: a holder  52  in which a fitting pipe  51  is detachably supported to be rotatable forward/in reverse with respect to the rotation support pipe  43  of the forward/reverse rotation support part  40 ; and a spoon accommodation container  53  supportedly mounted inside the holder to be withdrawable. 
     The holder  52  and the spoon accommodation container  53  of the spoon support part  50  are composed of a structure that allows the foreign materials generated by friction with the washing water or ultrasonic oscillations during the washing and washing process of the spoons to be discharged. In particular, the spoon accommodation container  53  may be formed of a perforated structure, but may also be formed of a mesh-type structure as necessary. 
     Therefore, the above-described spoon support part  50  may be implemented in various ways within a range that does not deviate from a use thereof, and the embodiments are as follows. 
     The spoon accommodation container  53  of the spoon support part  50  according to the present disclosure is divided in a state of being half and configured to be supportedly mounted with respect to the holder  52 , as illustrated in  FIGS. 8A and 8B , and  FIGS. 9A and 9B , and to be partitioned to have at least one accommodation space  53   a  at the inside thereof. 
     In addition, each spoon accommodation container  53  of the spoon support part  50  according to the present disclosure may be supportedly mounted to be withdrawable individually with respect to the holder  52 , as illustrated in  FIGS. 10A and 10B , and  FIG. 11 . 
     In addition, according to the present disclosure, each spoon accommodation container  53  of the spoon support part  50  may be configured individually but integrally fixedly installed with respect to the holder  52 , as illustrated in  FIG. 12 . 
     On the other hand, according to each embodiment of the present disclosure, the spoon accommodation container  53  of the spoon support part  50  may further be provided with a handle  53 - 1  for pulling-out. 
     By having the handle  53 - 1  for pulling-out, it is possible to more conveniently perform pulling out manipulation of the spoon accommodation container  53  from the holder  52 . 
     In addition, according to each embodiment of the present disclosure, the fitting pipe  51  of the spoon support part  50  may further be provided with a handle  51 - 1  for detaching manipulation. 
     By further having the handle  51 - 1  for detaching manipulation, it will be possible to more conveniently perform detaching manipulation of the holder  52  from the wash tub  20  when the holder  52  is pulled out after the washing operation. 
     In addition, according to each embodiment of the present disclosure, the holder ( 52 ) of the spoon support part ( 50 ) is further provided with a safety net ( 54 ) on a top side thereof. 
     The safety net  54  may play a role of preventing the spoons from leaving to the outside due to shaking during the forward/reverse washing process when a height of a top end of the spoon accommodation container  53  mounted on the holder  52  is mounted in a relatively low state. 
     According to the present disclosure, the wastewater and foreign material discharge part  60  is to discharge the wastewater or the foreign materials in the wash tub  20  to the outside after the first washing operation with washing water and the second washing operation by the ultrasonic oscillations are performed. To this end, the wastewater and foreign material discharge part  60  is installed passing through a bottom part of the wash tub in a state in which one end thereof positioned inside the wash tub protrudes by a predetermined height from a bottom of the wash tub. The wastewater and foreign material discharge part ( 60 ) may be installed with at least one for rapid discharge. 
     At this time, since the wastewater and foreign material discharge part  60  is disposed in a state in which the one end thereof protrudes from the bottom surface  22  of the wash tub  20  by the predetermined height, the bottom of the wash tub is always filled with a certain amount of water unless the wastewater is finally drained through a drain pipe  28 . In particular, such a point serves to induce a smooth rotation operation by preventing the through-assembly part of the forward/reverse rotation support part  40  installed to penetrate inside the washtub  20  from drying out. 
     According to the present disclosure, the rinsing water supply part  70  is configured, in a state in which foreign materials or wastewater is discharged through the wastewater and foreign material discharge part  60  after washing by the washing water and ultrasonic waves, to spray rinsing water heated to a proper temperature (80-85° C.) in the inside of a rinsing tank  71  together with a rinsing aid through at least one of nozzles  73  formed in an injection pipe  72  from above the spoon support part  50  rotating forward/in reverse, thereby rinsing the spoons having been completely washed. 
     In the drawing, reference numeral  28 , which is not described, denotes a drain pipe installed through the bottom of the wash tub  20 , and  74  denotes a drain pipe provided in the rinsing tank  71 . 
     Therefore, the spoons placed in the spoon accommodation container  53  of the spoon support part  50  and completely washed collides with the rinsing water while the spoon support part  50  rotates forward/in reverse, and various foreign substances are removed again, and wastewater or foreign materials generated in the rinsing process are discharged to the outside through the wastewater and foreign material discharge part  60  being in an open state. 
     Therefore, in the ultrasonic spoon washing apparatus according to the present disclosure configured as described above, the washing water and detergent are fed into the wash tub  20  through the washing water supply part and the detergent supply part  27 , while the forward/reverse rotation support part  40  rotates. The spoon support part  50  mounted on the support pipe  43  rotates forward/in reverse at the medium speed, whereby the spoons accommodated in the spoon accommodation container  53  of the spoon support part are first washed. In addition, when the washing water is filled to the highest water level by means of the highest water level detection sensor  24  in the wash tub, the spoon support part  50  rotates forward/in reverse at the low speed by the forward/reverse rotation support part  40 , and at the same time, by generating ultrasonic waves from the ultrasonic oscillators  30  mounted on the outside of the vertical side wall  23  made of polygonal surfaces of the wash tub, the spoons accommodated in the spoon accommodation container  53  of the spoon support part  50  are secondarily washed by the ultrasonic waves. 
     Here, ultrasonic oscillators are equipped on the vertical side wall  23  of the wash tub  20  made of polygonal surfaces, so the spoons to be secondarily washed by ultrasonic oscillations may be evenly washed by ultrasonic waves generated from various directions and angles. 
     In addition, when the first and second washing by the washing water and ultrasonic waves is completed, the foreign materials or wastewater remaining in the wash tub are discharged to the outside through opening of the wastewater and foreign material discharge part  60 , and at the same time, the rinsing water, which is heated to a high temperature (80-85° C.) in the rinsing tank  71  of the rinsing water supply part  70 , is sprayed from above the top of the spoon support part  50  together with an appropriate amount of the rinsing aid (rinse). At this time, the spoon support part  50  rotates forward/in reverse at the medium speed to evenly rinse the spoons accommodated in the spoon accommodation container  53 . 
     When wastewater and foreign materials generated in the rinsing process are also discharged to the outside through the wastewater and foreign materials discharge part  60  being in an open state, and rinsing by the rinsing water is completed, the spoon support part  50  is rotated forward/in reverse at the high speed again by the forward/reverse rotation support part  40 , and the water on the spoons is forcibly dried through this operation. 
     In addition, when the drying operation of the spoons is completed, the cover  12  is opened from the frame body  10 , and then the spoon accommodation container  53  is pulled out from the holder  52  of the spoon support part  50  to use the spoons. 
     Therefore, the spoons accommodated in each spoon accommodation container  53  accommodated in the holder  52  of the spoon support part  50  through a series of processes as described above may be automatically washed, and after washing and rinsing are completed, the drain pipes  28  and  74  are opened to wash the inside of the wash tub and the rinsing tank. 
     According to the present disclosure, it may be configured such that the wastewater and foreign materials, which are discharged through the drain pipes  28  and  74  connected to the wash tub  20  and the rinsing tank  71 , respectively, and the wastewater and foreign material discharge part  60  in the process of washing and rinsing the spoon, may be connected to each other and thus collected in one water collecting pipe  80  so as to be finally discharged to the outside through one discharge pipe  81 . By doing so, there is an advantage in that it is possible to more easily and simply manage the discharge of the wastewater and foreign materials. 
     Next, an ultrasonic spoon washing method according to the present disclosure is looked at as follows. 
     According to the washing method of the present disclosure, the spoons accommodated in the spoons accommodation container  53  of the spoon support part  50  are automatically washed through the followings, the washing method including: primarily washing the spoons placed in the spoon accommodation container ( 53 ) using washing water and detergent, while washing water and an appropriate amount of the detergent are supplied to the wash tub ( 20 ) having a vertical side wall ( 23 ) made of polygonal surfaces, and at the same time, the spoon support part ( 50 ), which is detachably mounted on the rotation support pipe ( 43 ) of the forward/reverse rotation support part ( 40 ), is rotated forward/in reverse at a medium speed; 
     secondarily washing the spoons using ultrasonic waves, wherein, when the washing water in the wash tub ( 20 ) reaches the highest water level, the spoon support part ( 50 ), mounted on the rotation support pipe ( 43 ) of the forward/reverse rotation support part ( 40 ), is rotated forward/in reverse from a medium speed to a low speed and, at the same time, the ultrasonic oscillators ( 30 ), mounted on the outside of the vertical sidewall ( 23 ) of the wash tub, are operated; 
     discharging the wastewater including the foreign materials in the wash tub ( 20 ) to the outside through the wastewater and foreign material discharge part ( 60 ) after the primarily and secondarily washing of the spoons is completed; 
     rinsing the spoons accommodated in the spoon accommodation container by rotating the spoon support part ( 50 ) forward/in reverse at the medium speed at the same time when draining of the wastewater and foreign materials are completed through the wastewater and foreign material discharge part ( 60 ), wherein, at the same time, in a state in which the wastewater and foreign material discharge part ( 60 ) is open, the rinsing water, which has been heated to a high temperature (80-85° C.) in the rinsing tank ( 71 ) of the rinsing water supply part ( 70 ), is sprayed evenly together with the appropriate amount of the rinsing aid from above the top of the spoon support part ( 50 ) through at least one nozzle ( 73 ) formed in an injection pipe ( 72 ); and 
     drying the spoons while rotating the spoon support part ( 50 ) forward/in reverse at the high speed again so that the water attached to the spoon accommodated in the spoon accommodation container ( 53 ) is removed after the rinsing is completed. 
     In addition, after the washing operation of the spoons is completed, the cover  12  of the frame body is opened, and then the spoon accommodation container  53  of the spoon support part  50  mounted on the rotation support pipe of the forward/reverse rotation support part  40  is pulled out to the outside to use the spoons. 
     In the ultrasonic washing method of the spoons, the forward/reverse rotation speed of the forward/reverse rotation support part  40  on which the spoon support part  50  is mounted may be set approximately to 20 to 30 times per minute in the case of the medium speed, to 5 to 10 times per minute in the case of the medium speed, and to 50 to 60 times per minute in the case of the high speed. 
     Through the method as described above, the spoons are washed over two times through the washing water and ultrasonic oscillations, and at the same time, a process of rinsing and drying is automatically performed after washing. In such a process, more efficient washing of the spoons may be achieved by varying the forward/reverse rotation speed of the spoon support part. 
     Although the present disclosure has been described with reference to the accompanying drawings, the present disclosure is not limited thereto, and it is natural that many modifications and changes may be made without departing from the scope of the following claims.