Abstract:
The present invention discloses a spray coating system with constant pressure and stirring function. The spray coating system comprises a stirring barrel containing a mixture material, a stirrer stirring the mixture material, a control valve used for controlling a spray rate of the packaging material, a nozzle connected to the control valve for spouting the packaging material in spray form, a circulation pipe line connected between the stirring barrel and the control valve and a peristaltic pump mounted at the circulation pipe line. Thereby, the spray coating system is applied to the dispensing process of the LED to stir the packaging material and spout the packaging material in spray form, and can transmit the packaging material remained back to the stirring barrel by the peristaltic pump for avoiding the extraneous entering to the packaging material and blocking the nozzle to advance the spray coating quality and efficiency.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    This invention generally relates to a spray coating system with constant pressure, and more particularly, to a spray coating system with constant pressure which uses the magnetic induction effect to perform the stirring function. 
         [0003]    2. Description of the Prior Art 
         [0004]    The traditional packaging process of light emitter diode (LED) mainly comprises: chip inspection, wafer expending, dispensing (backing adhesive operation), manual wafer probing or automatic mounting bracket, sintering, bonding, packaging, curing, cutting and testing, etc. Specifically, in the process of dispensing, the paste dispenser is used to drip the adhesive on corresponding locations of the LED brackets after mixing the epoxy resin with the phosphor or the silver powder according to the proper proportion. Next, the manual wafer probing or the automatic mounting bracket is performed. The traditional dispensing process has the advantages of low cost and big quantity, and its disadvantage is more difficult to control the dispensing rate. Because many detailed requirements about the phosphor distribution ratio, the adhesive height, the dispensing location and the likes need to be noticed, it will generate many problems if not follow these detailed requirements, for example, color from LED non-uniform, color temperature difference, or the color from LED looks too much yellow because adding too much the phosphor, or the color from LED looks too much blue because adding too less the phosphor. 
         [0005]    Thereby, the dispensing process improved is applied to perform the spray coating operation. The spray coating operation is performed by the automatic spray coating device after mixing the sold formulation (the phosphor or silver powder) and mixture (the epoxy resin) to generate the mixture material according to the specified proportion. The advantage of the dispensing process improved is that the coating thickness can be easily controlled, and the execution speed is faster than the tradition dispensing process. However, the dispensing process improved easily leads to remain or accumulate the mixture material in the nozzle to block the nozzle or make the composition heterogeneity of the packaging material so as to affect the product quality and the spray coating process. 
         [0006]    Moreover, there is a dispensing process using the motor&#39;s blades to stir and mix the sold formulation (the phosphor or silver powder) and mixture (the epoxy resin) to generate the mixture material according to the proper proportion, so as to perform the spray coating operation by the automatic spray coating device with the motor&#39;s blades. The advantage is that the dispensing process applying the motor&#39;s blade can not easily lead to remain or accumulate the mixture material in the nozzle to block the nozzle or make the composition heterogeneity of the packaging material, and therefore, the composition of packaging material will be uniform distribution, and not block the nozzle. However, the dispensing process with the motor&#39;s blade will easily bring the pollutant or the extraneous matter into the packaging material when operating the motor&#39;s blade, so as to pollute the packaging material and affect the spray coating quality. 
         [0007]    For the reason that the conventional spray coating system could not avoid the extraneous matter entering to the packaging material, a need has arisen to propose a novel scheme that may adaptively avoid the extraneous entering to the packaging material for preventing to pollute the packaging material, block the nozzle, generate the composition heterogeneity of the packaging material so as to advance the spray coating quality and efficiency. 
       SUMMARY OF THE INVENTION 
       [0008]    In view of the foregoing, it is an object of the present invention to provide a spray coating system with constant pressure and stirring function. The spray coating system comprises: a stirring barrel, containing a mixture material; a stirrer, connected to the stirring barrel, stirring the mixture material in the stirring barrel; a control valve, having a cavity body used to contain the mixture material; a nozzle, connected to the cavity body, mixing the mixture material and a gas pressed and spouting the mixture material mixed in spray form; a peristaltic pump, pumping the mixture material remained in the cavity body back to the stirring barrel after spouting; and a circulation pipe line, connected between the stirring barrel, the cavity body of the control valve and the peristaltic pump. 
         [0009]    Preferably, the stirring barrel further connects to a gas pressurization pipe, the gas pressurization pipe is connected to a gas pressurization device, and the gas pressurization device is used for pressing a gas into the stirring barrel through the gas pressurization pipe so as to transmit the mixture material in the stirring barrel into the cavity body of the control valve. Moreover, the pressurization pipe or the gas pressurization device has an adjusting valve used for adjusting a gas flow rate. 
         [0010]    Preferably, the stirrer further has a driving device and a stirring knife connected to the driving device, and the stirring knife is extended into the stirring barrel inside. 
         [0011]    Preferably, the stirrer further has a driving device and a magnetic stick inducing the driving device by a magnetic induction effect, and the magnetic stick is mounted in the stirring barrel, wherein the magnetic stick is the sharp of a circular, a ellipse, a disc, a cruciform, a star or a polygon. Moreover, the driving device is a magnetic driving device. 
         [0012]    Preferably, the control valve is a needle valve which uses a needle as a control switch. 
         [0013]    Preferably, the peristaltic pump is mounted between an output location of the stirring barrel and the control valve. 
         [0014]    Preferably, the peristaltic pump is mounted between an output location of the control valve and the stirring barrel. 
         [0015]    Preferably, the peristaltic pump further comprises a flexible tube and a pump driving device, and the flexible tube is connected to the circulation pipe line, wherein the pump driving device further comprises a rotator, a rotor connected to the rotator for pressing the flexible tube, and a drive motor used for turning the rotator. 
         [0016]    Based on one object of the present invention, a spray coating system with constant pressure and stirring function is disclosed according to one embodiment of the present invention. The spray coating system comprises: a stirring barrel, containing a packaging material; a stirrer, connected to the stirring barrel, stirring the packaging material in the stirring barrel; a control valve, having a cavity body used for containing the packaging material; a nozzle, connected to the cavity body of the control valve, mixing the mixture material and a gas pressed and spouting the mixture material mixed in spray form; a circulation pipe line, comprising a first pipe line and a second pipe line, wherein the first pipe line is connected to the stirring barrel and the cavity body of the control valve for transmitting the packaging material in the stirring barrel into the cavity body of the control valve, and the second pipe line is connected to the cavity body of the control valve and the stirring barrel for transmitting the packaging material remained in the cavity body back to the stirring barrel after spouting; and a peristaltic pump, mounted at the circulation pipe line, pumping the mixture material remained in the cavity body back to the stirring barrel. 
         [0017]    Preferably, the stirring barrel further connects to a gas pressurization pipe, the gas pressurization pipe is connected to a gas pressurization device, and the gas pressurization device is used for pressing a gas into the stirring barrel through the gas pressurization pipe so as to transmit the mixture material in the stirring barrel into the cavity body of the control valve. Moreover, the pressurization pipe or the gas pressurization device has an adjusting valve used for adjusting a gas flow rate. 
         [0018]    Preferably, the stirrer further has a driving device and a stirring knife connected to the driving device, and the stirring knife is extended into the stirring barrel inside. 
         [0019]    Preferably, the stirrer further has a driving device and a magnetic stick inducing the driving device by a magnetic induction effect, and the magnetic stick is mounted in the stirring barrel, wherein the magnetic stick is the sharp of a circular, a ellipse, a disc, a cruciform, a star or a polygon. Moreover, the driving device is a magnetic driving device. 
         [0020]    Preferably, the control valve is a needle valve which uses a needle as a control switch. 
         [0021]    Preferably, the peristaltic pump is mounted at the first pipe line. 
         [0022]    Preferably, the peristaltic pump is mounted at the second pipe line. 
         [0023]    Preferably, the peristaltic pump further comprises a flexible tube and a pump driving device, and the flexible tube is connected to the circulation pipe line, wherein the pump driving device further comprises a rotator, a rotor connected to the rotator for pressing the flexible tube, and a drive motor used for turning the rotator. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0024]    The accompanying drawings incorporated in and forming a part of the specification illustrate several aspects of the present invention, and together with the description serve to explain the principles of the disclosure. In the drawings: 
           [0025]      FIG. 1  shows a block diagram of a spray coating system with constant pressure and stirring function according to one embodiment of the present invention; 
           [0026]      FIG. 2  shows a structure diagram of a spray coating system with constant pressure and stirring function according to one embodiment of the present invention; and 
           [0027]      FIG. 3  shows a structure diagram of a spray coating system with constant pressure and stirring function according to another embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0028]    Some embodiments of the present invention will now be described in greater detail. Nevertheless, it should be noted that the present invention can be practiced in a wide range of other embodiments besides those explicitly described, and the scope of the present invention is expressly not limited except as specified in the accompanying claims. 
         [0029]    Moreover, some irrelevant details are not drawn in order to make the illustrations concise and to provide a clear description for easily understanding the present invention. 
         [0030]    Referring to  FIG. 1 , which illustrates a spray coating system  100  with constant pressure and stirring function according to one embodiment of the present invention. The spray coating system  100  with constant pressure and stirring function comprises: a stirring barrel  110 , a stirrer  120 , a control valve  130 , a nozzle  140 , a circulation pipe line  150  and a peristaltic pump  160 . Specifically, the stirring barrel  110  is a container, which contains a mixture material connects to an external gas pressurization device (not shown in). The gas is pressed into the stirring barrel  110  by using the gas pressurization device so as to press the mixture material in the stirring barrel  110  into the control valve  130 . The stirrer  120  is assembly coupled to a predefined location of the stirring barrel  110  for stirring the mixture material in the stirring barrel  110 . 
         [0031]    The control valve  130  has a cavity body  131  used for containing the mixture material from the stirring barrel  110  so as to spray out the mixture material from the cavity body  131 . The nozzle  140  is connected to the cavity body  131  in the control valve  130  for mixing the gas pressed and the mixture material so as to allow spouting the material mixed of the nozzle in spray form. 
         [0032]    The circulation pipe line  150  connects to the stirring barrel  110 , the control valve  130  and the peristaltic pump  160 , and transmits the mixture material remained back to the stirring barrel  110 . 
         [0033]    The peristaltic pump  160  is mounted at the circulation pipe line  150  for pumping the mixture material remained in the cavity body  131  back to the stirring barrel  110 . 
         [0034]    As shown in  FIG. 1 , the spray coating system  100  of the present invention may inject the mixture material liquid into the stirring barrel  110 , and use the stirrer  120  to stir the mixture material liquid for achieving the hybrid equilibrium. Then, the external gas pressurization device presses the gas into the stirring barrel  110  so as to press the mixture material in the stirring barrel  110  into the cavity body  131  of the control valve  130 , and the nozzle  140  spouts the mixture material in spray form. However, the mixture material in the cavity body  131  can not be completely exhausted at once in spraying process, and meanwhile the peristaltic pump  160  pumps the mixture material remained in the cavity body  131  or the nozzle  140  to the circulation pipe line  150 , and then the mixture material remained is transmitted back into the stirring barrel  110 . 
         [0035]    Referring to  FIG. 2 , which illustrates a spray coating system  200  with constant pressure and stirring function according to one embodiment of the present invention. The spray coating system  200  with a constant pressure and a stirring function comprises: a stirring barrel  210 , a stirrer  220 , a control valve  230 , a nozzle  240 , a circulation pipe line  250  and a peristaltic pump  260 . Specifically, the stirring barrel  210  is a container, which contains a packaging material  270  connects to a gas pressurization pipe  211  connected to an external gas pressurization device (not shown in). The gas is pressed into the stirring barrel  110  through the gas pressurization pipe  211  by using the gas pressurization device so as to allow pressing the packaging material  270  in the stirring barrel  210  into the control valve  230 . Specifically, the gas pressurization pipe  211  or the gas pressurization device may have an adjusting valve (not shown in) used for adjusting the gas flow rate, and the quantitative packaging material  270  is pressed into the control valve  230  by using the adjusting valve. The stirrer  220  is assembly coupled to a predefined location of the stirring barrel  210  for stirring the packaging material  270  in the stirring barrel  210 . The stirrer  220  is assembly coupled to a predefined location of the stirring barrel  210  for stirring the mixture material in the stirring barrel  210 . In the preferred embodiment, the stirrer  220  has a driving device  221  connects to the stirrer  210  and a stirring knife  222  connecting to the driving device  221 . Specifically, the driving device  221  may be a motor or other device that can generate the power, and the stirring knife  222  is extended to the stirring barrel  210  inside for stirring the packaging material  270  in the stirring barrel  210 . 
         [0036]    The control valve  230  has a cavity body  231  containing the packaging material  270  from the stirring barrel  210  so as to spray out the packaging material  270  from the cavity body  231 . In the preferred embodiment, the control valve  230  may be a needle valve using a needle  232  as a control switch or other kind of valve. The nozzle  240  is connected to the cavity body  231  of the control valve  230  so as to allow spouting the mixed material which mixes the packaging material  270  and the gas pressed in spray form, and perform the dispensing process for the LED via the spray coating operation. 
         [0037]    The circulation pipe line  250  comprises a first pipe line  251  and a second pipe line  252 , and the first pipe line  251  is connected between the stirring barrel  210  and the cavity body  231  of the control valve  230  for transmitting the packaging material  270  in the stirring barrel  210  into the cavity body  231  of the control valve  230 ; the second pipe line  252  is connected between the cavity body  231  of the control valve  230  and the stirring barrel  210  for transmitting the packaging material  270  remained in the cavity body  231  back to the stirring barrel  210 . 
         [0038]    The peristaltic pump  260  may mount at the first pipe line  251  or the second pipe line  252  for pumping the packaging material  270  in the cavity body  231  back to the stirring barrel  210 . In the preferred embodiment, the peristaltic pump  260  comprises a flexible tube  261  and the pump driving device  262 . The flexible tube  261  may connect to the first pipe line  251  or the second pipe line  252  for keeping the packaging material  270  flow smoothly and be clear by pressing the flexible tube  261 . The pump driving device  262  has a rotator  264 , at least one rotor  265  which is connected to the rotator  264  so as to press the flexible tube  261  (as shown in three rotors  265 ), and a drive motor  266  used for driving and turn the rotator  264 . The rotators  265  presses the flexible tube  261  to pump the packaging material  270  back to the stirring barrel  210  when turning the rotator  264 . 
         [0039]    As shown in  FIG. 2 , the spray coating system  200  of the present invention may inject the packaging material  270  liquid into the stirring barrel  210 , for example, the liquid epoxy resin, the phosphor, the silver powder or other material, and use the stirring knife  222  of the stirrer  220  to stir the packaging material  270  for achieving the hybrid equilibrium. Then, the external gas pressurization device presses the gas into the stirring barrel  210  through the gas pressurization pipe  211  so as to press the mixture material  270  in the stirring barrel  210  into the cavity body  231  of the control valve  230 , and the nozzle  240  spouts the mixture material which mixes the gas pressed and the packaging material  270  in spray form so as to perform the dispensing process for the LED via the spray coating operation. However, the cavity body  231  of the control valve  230  can not be completely exhausted in spraying process at once, and meanwhile the peristaltic pump  260  pumps the packaging material  270  remained in the cavity body  231  or the nozzle  240  to the second pipe line  252  of the circulation pipe line  250  by driving the rotors  265  of the driving device  262  so as to press the flexible tube  261 , and then the packaging material  270  remained is transmitted back into the stirring barrel  210  through the second pipe line  252 . 
         [0040]    Referring to  FIG. 3 , which illustrates a spray coating system  300  with constant pressure and stirring function according to another embodiment of the present invention. The spray coating system  300  with a constant pressure and a stirring function comprises: a stirring barrel  310 , a stirrer  320 , a control valve  330 , a nozzle  340 , a circulation pipe line  350  and a peristaltic pump  360 . Specifically, the stirring barrel  310  is a container, which contains a packaging material  370  connects to a gas pressurization pipe  311  connected to an external gas pressurization device (not shown in). The gas is pressed into the stirring barrel  310  through the gas pressurization pipe  311  by using the gas pressurization device so as to allow pressing the packaging material  370  in the stirring barrel  310  into the control valve  330 . Specifically, the gas pressurization pipe  311  or the gas pressurization device may have an adjusting valve (not shown in) used for adjusting the gas flow rate, and the quantitative packaging material  370  is pressed into the control valve  330  by using the adjusting valve. The stirrer  320  is assembly coupled to a predefined location of the stirring barrel  310  for stirring the packaging material  370  in the stirring barrel  310 . In the preferred embodiment, the stirrer  320  has a driving device  321  connected to the stirrer  310  and a magnetic stick  322  mounted in the stirring barrel  310  for using the magnetic induction effect to induce the driving device  321 . In other words, the driving device  321  drives the magnetic stick  322  by the magnetic induction so as to stir the packaging material  270  in the stirring barrel  310  by the magnetic stick  322 . 
         [0041]    The control valve  330  has a cavity body  331  containing the packaging material  370  from the stirring barrel  310  so as to spray out the packaging material  370  from the cavity body  331 . In the preferred embodiment, the control valve  330  may be a needle valve using a needle  332  as a control switch or other kind of valve. The nozzle  340  is connected to the cavity body  331  of the control valve  330  so as to allow spouting the mixed material which mixes the packaging material  370  and the gas pressed in spray form, and perform the dispensing process for the LED via the spray coating operation. 
         [0042]    The circulation pipe line  350  comprises a first pipe line  351  and a second pipe line  352 , and the first pipe line  351  is connected between the stirring barrel  310  and the cavity body  331  of the control valve  330  for transmitting the packaging material  370  in the stirring barrel  310  into the cavity body  331  of the control valve  330 ; the second pipe line  352  is connected between the cavity body  331  of the control valve  330  and the stirring barrel  310  for transmitting the packaging material  370  remained in the cavity body  331  back to the stirring barrel  310 . 
         [0043]    The peristaltic pump  360  may mount at the first pipe line  351  or the second pipe line  352  for pumping the packaging material  370  remained in the cavity body  331  back to the stirring barrel  310 . In the preferred embodiment, the peristaltic pump  360  comprises a flexible tube  361  and the pump driving device  362 . The flexible tube  361  may connect to the first pipe line  351  or the second pipe line  352  for keeping the packaging material  370  flow smoothly and be clear by pressing the flexible tube  361 . The pump driving device  362  has a rotator  364 , at least one rotor  365  which is connected to the rotator  364  so as to press the flexible tube  361  (as shown in three rotors  365 ), and a drive motor  366  used for driving and turn the rotator  364 . The rotators  365  presses the flexible tube  361  to pump the packaging material  370  back to the stirring barrel  310  when turning the rotator  364 . 
         [0044]    As shown in  FIG. 3 , the spray coating system  300  of the present invention may inject the packaging material  370  liquid into the stirring barrel  310 , for example, the liquid epoxy resin, the phosphor, the silver powder or other material, and use the magnetic stick  322  of the stirrer  320  to stir the packaging material  370  for achieving the homogeneous mixing. Then, the external gas pressurization device presses the gas into the stirring barrel  310  through the gas pressurization pipe  311  so as to press the packaging material  370  in the stirring barrel  310  into the cavity body  331  of the control valve  330 , and the nozzle  340  spouts the mixture material which mixes the gas pressed and the packaging material  370  in spray form so as to perform the dispensing process for the LED via the spray coating operation. However, the mixture material in the cavity body  331  of the control valve  330  can not be completely exhausted at once in spraying process, and meanwhile the peristaltic pump  360  pumps the packaging material  370  remained in the cavity body  331  or the nozzle  340  to the second pipe line  352  of the circulation pipe line  350  by driving the rotors  365  of the pump driving device  362  so as to press the flexible tube  361 , and then the packaging material  370  remained is transmitted back into the stirring barrel  310  through the second pipe line  352 . 
         [0045]    Although specific embodiments have been illustrated and described, it will be obvious to those skilled in the art that various modifications may be made without departing from what is intended to be limited solely by the appended claims.