JP2011062676A - Method and device for cleaning coating gun - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for cleaning a coating gun which can substantially recover the total amount of waste liquids discharged from a coating gun in the case of color change. <P>SOLUTION: The method for cleaning a coating gun is for cleaning the coating gun 110 in the case of color change, and includes a process of discharging the waste liquid containing a coating into a liquid while immersing the tip of the coating gun into a cleaning vessel 20 filled with a cleaning liquid. The device 1 for cleaning the coating gun is for cleaning the coating gun 110 in the case of color change, and includes the cleaning vessel 20 discharging the waste liquids containing a coating into a cleaning liquid and maintained in the state of always filling of the cleaning liquid, and a recovery vessel 30 arranged at the outside of the cleaning vessel and recovering the liquid overflowed from the cleaning vessel. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method and apparatus for cleaning a paint gun. Specifically, the present invention relates to a coating gun cleaning method and apparatus for collecting waste liquid discharged from a coating gun during color change.

  Conventionally, various collection apparatuses for collecting waste liquid discharged from a coating gun during color change have been proposed. This waste liquid includes paint used so far and thinner as a cleaning liquid for cleaning the discharge path of the paint.

  In general, the conventional recovery device has a problem that the paint contained in the waste liquid is likely to adhere to the inner wall surface of the recovery device. A recovery device that has a certain effect on solving this problem has also been proposed (see, for example, Patent Document 1).

JP 2004-089900 A

  However, the recovery device disclosed in Patent Document 1 arranges the gun tip of the coating gun at a predetermined position with respect to the recovery container, and discharges the waste liquid atomized from the gun tip into the internal space of the recovery container. The atomized waste liquid mist released into the space is scattered in the air. Therefore, there is a problem that it is very difficult to recover substantially all of the waste liquid.

  The present invention has been made in view of the above-described problems, and provides a coating gun cleaning method and apparatus capable of collecting substantially all of the waste liquid discharged from the coating gun during color change. Objective.

  The coating gun cleaning method according to the present invention is a coating gun cleaning method for cleaning a coating gun (for example, a coating gun 110 described later) at the time of color change, and a cleaning tank (for example, a cleaning described later) containing a cleaning liquid. The tank 20) includes a step of discharging the waste liquid containing the paint into the cleaning liquid in a state where the tip of the coating gun (for example, a bell cup 111 described later) is immersed.

  According to this invention, the waste liquid containing the paint is discharged from the coating gun into the liquid. Thereby, substantially all of the waste liquid discharged from the coating gun at the time of color change can be collected.

  In this case, it is preferable that the method further includes a step of releasing the cleaning liquid from the coating gun by positioning the tip of the coating gun above the liquid level of the cleaning tank after the step.

  According to the present invention, the tip portion of the coating gun after the discharge of the waste liquid in the liquid is cleaned on the liquid surface. Thereby, the coating gun can be cleaned with a small amount of cleaning liquid.

  A coating gun cleaning device according to the present invention is a coating gun cleaning device (for example, a coating gun cleaning device 1 to be described later) that cleans a coating gun when changing colors. And a recovery tank (for example, a recovery tank 30 to be described later) that is disposed outside the cleaning tank and collects the liquid overflowing from the cleaning tank. It is characterized by that.

  According to this invention, the waste liquid is discharged from the coating gun to the cleaning liquid in the cleaning tank and overflows from the cleaning tank to the recovery tank, so that substantially all of the waste liquid discharged from the coating gun at the time of color change is recovered. be able to.

In this case, it further includes a circulation path (for example, a circulation path 40 described later) for recovering the cleaning liquid from the liquid recovered in the recovery tank and supplying it to the lower part of the cleaning tank,
The circulation path includes a separation tank (for example, a primary separation tank 50 described later) that separates the liquid collected in the collection tank into a high specific gravity liquid with a large amount of paint and a low specific gravity liquid with a large amount of cleaning liquid due to a difference in specific gravity. It is preferable.

  According to the present invention, the liquid recovered in the recovery tank can be separated into a high specific gravity liquid with a large amount of paint and a low specific gravity liquid with a large amount of cleaning liquid in the separation tank.

  In this case, the circulation path includes a circulation pump that supplies the low specific gravity liquid from the separation tank to the cleaning tank (for example, a recovered liquid circulation pump 60 described later), and the low specific gravity liquid that is sent from the circulation pump. It is preferable to include a filter (for example, a filter 70 described later) that performs filtration to generate the cleaning liquid.

According to the present invention, a recovered cleaning liquid in which the cleaning liquid occupies most can be generated by filtering the low specific gravity liquid.
Then, by supplying and circulating the generated recovered cleaning liquid to the bottom of the cleaning tank, the amount of cleaning thinner used for recovering the waste liquid discharged from the coating gun can be suppressed.

  In this case, the upper part of the recovery tank has a cylindrical part positioned above the upper part of the cleaning tank, and an air blower that blows out air slightly downward from the opening of the upper part of the cylindrical part toward the center (for example, It is preferable to provide an air blow 35) described later.

  According to the present invention, the tip of the coating gun can be drained reliably by air blowing from the upper part of the collection tank toward the tip of the coating gun.

  According to the present invention, substantially all of the waste liquid discharged from the coating gun during color change can be collected.

It is a schematic block diagram which shows the washing | cleaning apparatus of the coating gun which concerns on one Embodiment of this invention. It is a schematic block diagram which shows immersion of the front part of the coating gun and waste liquid discharge operation | movement which concern on this embodiment. It is a schematic block diagram which shows the draining of the front part of the coating gun which concerns on this embodiment, and washing | cleaning liquid discharge | release operation | movement. It is a schematic block diagram which shows the waste liquid collection | recovery system of the coating gun which used multiple washing | cleaning apparatuses which concern on this embodiment. It is a schematic block diagram which shows the storing state of the washing | cleaning apparatus which concerns on this embodiment. It is a schematic block diagram which shows the use condition of the washing | cleaning apparatus which concerns on this embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the coating gun cleaning apparatus 1 according to the present embodiment includes a recovery device 10 and a circulation path 40.

  The recovery device 10 is configured with an inner and outer two tank structure of a cleaning tank 20 and a recovery tank 30. The inner cleaning tank 20 is a tank that causes the recovered cleaning liquid to overflow, and the outer recovery tank 30 includes a storage tank 31 that stores liquid overflowing from the cleaning tank 20.

  The cleaning tank 20 has a necessary diameter and depth so that the tip (bell cup 111) of the coating gun 110 can be immersed in the recovered cleaning liquid when the color is changed. The cleaning tank 20 includes a recovered cleaning liquid introduction pipe 21 at the bottom, and the recovered cleaning liquid is introduced from the recovered cleaning liquid introduction pipe 21 into the cleaning tank 20. This recovered cleaning liquid is mostly thinner. As will be described later, the recovered cleaning liquid is obtained by separating the recovered stock solution mixed with the paint and the thinner by specific gravity and then filtering the supernatant.

  The recovered cleaning liquid introduced from the recovered cleaning liquid introducing pipe 21 is always kept overflowing from the upper end edge of the cleaning tank 20. Inside the cleaning tank 20, the recovered cleaning liquid always flows from the bottom to the top. The liquid level of the recovered cleaning liquid is always kept at a constant height where the recovered cleaning liquid overflows from the cleaning tank 20.

  When the bell cup 111 of the coating gun 110 is immersed under the liquid level of the cleaning tank 20 and the waste liquid is discharged into the liquid, it corresponds to the volume under the liquid level of the coating gun 110 and the volume of the discharged waste liquid. The overflowing liquid overflows. During this time, the liquid level is kept constant.

The collection tank 30 is arranged concentrically outside the cleaning tank 20. An annular storage tank 31 that stores liquid overflowing from the cleaning tank 20 is formed in the lower part of the recovery tank 30. The bottom of the cleaning tank 20 is fixed to the upper end of the inner wall 32 of the storage tank 31. In this case, in order to facilitate maintenance, it is preferable that the cleaning tank 20 and the collection tank 30 are detachable.
The storage tank 31 includes a recovered stock solution discharge pipe 33 at the bottom.

  In the upper part of the collection tank 30, there is a cylindrical portion 34 positioned above the upper end of the cleaning tank 20. A large number of air blows 35 are provided on the upper portion of the cylindrical portion 34. Each air blow 35 blows air slightly downward from the upper opening of the cylindrical portion 34 toward the center. These air blows 35 are preferably arranged substantially evenly in the circumferential direction along the cylindrical portion 34 of the collection tank 30.

  A number of exhaust holes 36 are formed above the inner wall 32 of the storage tank 31. These exhaust holes 36 are preferably arranged substantially evenly in the circumferential direction along the inner wall 32.

  In the painting booth, air conditioning is usually ventilated from top to bottom. Regardless of whether the painting gun 110 is changing color or painting, there is always a flow of air from top to bottom in the gap between the cleaning tank 20 and the collection tank 30. The many exhaust holes 36 serve to smoothly pass such air flow.

  As will be described later, the air that is sprayed when the air blow 35 is activated to cut the water (liquid) of the coating gun 110 is discharged from the exhaust hole 36 of the collection tank 30. For this reason, the paint gun 110 is prevented from being contaminated by the splash of the waste liquid.

  The circulation path 40 is a path from the recovered stock solution discharge pipe 33 of the recovery tank 30 to the recovered cleaning liquid introduction pipe 21 of the cleaning tank 20. In the circulation path 40, a primary separation tank 50 as a separation tank, a recovered liquid circulation pump 60 as a circulation pump, and a filter 70 are sequentially arranged from the upstream side.

  The circulation path 40 includes a first pipeline 41, a second pipeline 42, a third pipeline 43, and a fourth pipeline 44. The first pipe 41 is a drain pipe, and connects the recovered stock solution discharge pipe 33 of the recovery tank 30 and the primary separation tank 50. The second pipe line 42 is a recovered liquid recycling pipe, and connects the primary separation tank 50 and the recovered liquid circulation pump 60. The third pipe line 43 connects the recovered liquid circulation pump 60 and the filter 70. The fourth pipe 44 connects the filter 70 and the recovered cleaning liquid introduction pipe 21 of the cleaning tank 20.

  The primary separation tank 50 separates the recovered stock solution introduced from the storage tank 31 of the recovery tank 30 through the recovered stock solution discharge pipe 33 and the first pipe 41 by the difference in specific gravity. In this case, since the primary separation tank 50 has a sealed structure, as will be described later, the negative pressure corresponding to the suction of the liquid from the primary separation tank 50 by the collection liquid circulation pump 60 causes the storage tank 31 of the collection tank 30 to The collected recovered stock solution can be effectively introduced into the primary separation tank 50.

The recovered stock solution introduced into the primary separation tank 50 includes paint and thinner. The paint contained in the recovered stock solution sinks because of its high specific gravity, and the thinner floats because of its low specific gravity. Therefore, a high specific gravity liquid containing a lot of paint is collected near the bottom of the primary separation tank 50, and a low specific gravity liquid containing a lot of thinner is collected near the liquid surface.
The primary separation tank 50 is provided with a liquid level monitoring panel 51 that constantly monitors the height of the liquid level.

The recovered liquid circulation pump 60 sucks up a low specific gravity liquid containing a lot of thinner from a slightly lower surface of the primary separation tank 50. That is, the inlet end of the second pipeline 42 is disposed at a position slightly below the liquid level of the primary separation tank 50. This position is preferably adjusted according to the fluctuation of the liquid level monitored by the liquid level monitoring panel 51.
The recovered liquid circulation pump 60 sends the low specific gravity liquid sucked from the primary separation tank 50 to the filter 70 through the third pipe 43.

The filter 70 filters the low specific gravity liquid fed through the third conduit 43. The low specific gravity liquid is filtered by the filter 70, so that the content of the paint contained is further reduced and the liquid becomes closer to a pure cleaning liquid. In other words, the thinner is the recovered cleaning liquid that occupies most of the thinner.
The recovered cleaning liquid filtered by the filter 70 is sent into the cleaning tank 20 from the recovered cleaning liquid introducing pipe 21 through the fourth pipe 44 due to the pressure of the recovered liquid circulating pump 60.

  The primary separation tank 50 is provided with a waste liquid pipe 81 that connects the bottom of the primary separation tank 50 and the waste liquid transfer pump 80. The waste liquid transfer pump 80 sucks up the waste liquid containing a large amount of paint, which is a high specific gravity liquid, from the bottom of the primary separation tank 50 through the waste liquid conduit 81. The waste liquid transfer pump 80 feeds the waste liquid sucked from the primary separation tank 50 to the waste liquid drum can 90 through the waste liquid conduit 82. The waste liquid accommodated in the waste liquid drum can 90 is recycled by a waste liquid processing company.

  Next, with reference to FIG. 2 and FIG. 3, the operation of immersing the tip of the coating gun 110 and discharging the waste liquid, and draining water (that is, draining) and cleaning operations by the cleaning tank 20 and the recovery tank 30 will be described. .

  As shown in FIG. 2, when changing colors, the bell cup 111 of the coating gun 110 is immersed in the recovered cleaning liquid (mostly thinner) in the cleaning tank 20. Dust dirt generated during the painting process is attached to the outer periphery of the bell cup 111. By immersing the bell cup 111 in the recovered cleaning liquid of the cleaning tank 20, dirt attached to the outer periphery of the bell cup 111 can be cleaned.

At the time of color change, the waste liquid containing paint and thinner used so far is discharged from the inside of the bell cup 111 of the coating gun 110 immersed in the recovered cleaning liquid of the cleaning tank 20. The discharge of the waste liquid is performed in the recovered cleaning liquid of the cleaning tank 20.
That is, when the waste liquid is discharged in the air, it becomes a mist-like waste liquid mist and scatters in the air, but the waste liquid discharged in the recovered cleaning liquid in the cleaning tank 20 does not scatter in the air at all. Therefore, the entire amount of waste liquid discharged from the bell cup 111 of the coating gun 110 is recovered in the recovered cleaning liquid.

  The recovered cleaning liquid in the cleaning tank 20 always flows from the bottom to the top and overflows. Therefore, the waste liquid discharged from the bell cup 111 into the recovered cleaning liquid overflows from the cleaning tank 20 due to the flow.

  The paint contained in the waste liquid discharged from the bell cup 111 into the recovered cleaning liquid has a higher specific gravity than the thinner. Therefore, when there is no flow of the recovered cleaning liquid in the cleaning tank 20, it settles and accumulates at the bottom. However, in the cleaning tank 20, the recovered cleaning liquid always flows from the bottom to the top. The paint contained in the waste liquid cannot settle due to this flow, and overflows on the flow immediately after being discharged into the recovered cleaning liquid. Therefore, the paint contained in the waste liquid is also greatly suppressed from diffusing downward in the recovered cleaning liquid.

  That is, most of the paint stays in the cleaning tank 20 only for a very short time. Therefore, the concentration of the paint in the recovered cleaning liquid in the cleaning tank 20 does not become higher than a certain level, and is maintained at the allowable minimum. .

  As shown in FIG. 3, as the final operation of the color change cleaning, the bell cup 111 is rotated at a high speed at a position where the bell cup 111 of the coating gun 110 is slightly raised from the liquid surface of the cleaning tank 20. The recovered cleaning liquid (mostly thinner) adhering to 111 is blown off by centrifugal force to cut water (liquid).

At this time, the inside of the bell cup 111 is cleaned by releasing a small amount of cleaning thinner and air from the inside of the coating gun 110.
The bell cup 111 is cleaned to some extent by the recovered cleaning liquid in the cleaning tank 20 by the dipping process shown in FIG. Therefore, a small amount of the cleaning thinner used in the draining cleaning step shown in FIG. 3 is sufficient.

In this way, the recovered cleaning liquid adhering to both the inner and outer surfaces of the bell cup 111 is blown off by centrifugal force, and the inside of the bell cup 111 is cleaned with a cleaning thinner, and at the same time, air blow 35 is performed to completely cut water (liquid). do.
The recovered cleaning liquid and cleaning thinner scattered from the bell cup 111 by this operation hit the inner wall surface of the recovery tank 30 and accumulate in the storage tank 31 of the recovery tank 30 in the same manner as the waste liquid.

  An air blow in which an air mix thinner is added to the air blow 35 can also be provided. In this case, dust dirt on the outside of the bell cup 111 and the tip of the coating gun 110 main body can also be cleaned.

  As shown in FIGS. 2 and 3, as a result of the waste liquid collecting operation and draining operation of the coating gun 110, the recovered stock solution collected in the storage tank 31 of the recovery tank 30 is discharged from the bell cup 111 of the coating gun 110. The waste liquid containing the paint and the thinner overflowed from the cleaning tank 20, the recovered cleaning liquid overflowed from the cleaning tank 20, and a small amount of bell cup cleaning thinner are included.

  The recovered stock solution is introduced from the storage tank 31 through the recovered stock solution discharge pipe 33 and the first pipe 41 into the primary separation tank 50 and separated due to the difference in specific gravity. That is, a high specific gravity liquid containing a lot of paint is collected near the bottom of the primary separation tank 50, and a low specific gravity liquid containing a lot of thinner is collected near the liquid surface.

  The low specific gravity liquid containing a large amount of thinner is sucked up by the recovered liquid circulation pump 60 and further fed into the filter 70 through the third pipe 43. The low specific gravity liquid is filtered by the filter 70 to further reduce the amount of paint contained therein, and becomes a recovered cleaning liquid in which thinner is a major part.

  The recovered cleaning liquid is fed into the cleaning tank 20 from the recovered cleaning liquid introducing pipe 21 through the fourth pipe 44 due to the pressure of the recovered liquid circulating pump 60. And the flow of the collection | recovery washing | cleaning liquid which flows into the inside of the washing tank 20 toward the top from the bottom is produced, and overflows from the upper end edge of the washing tank 20 before long.

  In this way, the amount of cleaning thinner used to recover the waste liquid discharged from the coating gun 110 is reduced by supplying the recovered cleaning liquid from the recovered cleaning liquid introduction pipe 21 into the cleaning tank 20 and causing it to overflow and circulate. Can be suppressed.

On the other hand, the waste liquid containing a large amount of high-density liquid paint collected at the bottom of the primary separation tank 50 is sucked up by the waste liquid transfer pump 80 and sent to the waste liquid drum can 90 through the waste liquid conduit 82. The waste liquid stored in the waste liquid drum can 90 has a thinner ratio and a higher paint concentration than the waste liquid discharged from the coating gun 110.
Therefore, compared with the case where the waste liquid discharged from the coating gun 110 is processed as it is, it is possible to reduce the amount of processing requested from the waste liquid processing company.

  Next, with reference to FIG. 4, a coating gun waste liquid recovery system 2 that uses a plurality of coating gun cleaning apparatuses 1 will be described.

  As shown in FIG. 4, the waste liquid collection system 2 for the painting gun corresponds to six painting robots 100a to 100f. The waste liquid recovery system 2 includes six recovery units 10a to 10f in order to correspond to the coating guns 110a to 110f of the respective coating robots.

  The three painting robots 100a, 100b, and 100c constitute a line. Corresponding to the circulation paths 40a, 40b, and 40c of the three recovery devices 10a, 10b, and 10c, one primary separation tank 50A, a recovery liquid circulation pump 60A, and a filter 70A that are common to these are disposed. The

  That is, the first pipelines 41a, 41b, and 41c of the three recovery devices 10a, 10b, and 10c are combined into one first pipeline 41A and connected to the primary separation tank 50A. The primary separation tank 50A and the recovered liquid circulation pump 60A are connected by a second pipe line 42A. The recovered liquid circulation pump 60A and the filter 70A are connected by a third conduit 43A. One fourth conduit 44A exiting from the filter 70A is branched into three fourth conduits 44a, 44b, 44c and connected to three recovery devices 10a, 10b, 10c, respectively.

  Similarly, the three painting robots 100d, 100e, and 100f form a line. Corresponding to the circulation paths 40d, 40e, and 40f of the three recovery devices 10d, 10e, and 10f, a primary separation tank 50B, a recovery liquid circulation pump 60B, and a filter 70B that are common to these are disposed. The

  That is, the first pipelines 41d, 41e, and 41f of the three collection devices 10d, 10e, and 10f are combined into one first pipeline 41B and connected to the primary separation tank 50B. The primary separation tank 50B and the recovered liquid circulation pump 60B are connected by a second pipe line 42B. The recovered liquid circulation pump 60B and the filter 70B are connected by a third conduit 43B. One fourth conduit 44B exiting from the filter 70B is branched into three fourth conduits 44d, 44e, 44f and connected to three recovery devices 10d, 10e, 10f, respectively.

  One end of the waste liquid conduit 81A is connected to the bottom of the primary separation tank 50A. One end of a waste liquid line 81B is connected to the bottom of the primary separation tank 50B. The other end of the waste liquid pipe 81 </ b> A and the other end of the waste liquid pipe 81 </ b> B are combined into one waste liquid pipe 81 and connected to one waste liquid transfer pump 80. The waste liquid transfer pump 80 feeds the waste liquid sucked from the primary separation tanks 50 </ b> A and 50 </ b> B to the waste liquid drum 90 through the waste liquid pipe line 82. The waste liquid accommodated in the waste liquid drum can 90 is recycled by a waste liquid processing company.

In such a waste liquid recovery system 2, only one common primary separation tank 50A, recovered liquid circulation pump 60A, and filter 70A need be arranged for the three recoverers 10a, 10b, and 10c.
Similarly, only one common primary separation tank 50B, recovered liquid circulation pump 60B, and filter 70B need be arranged for the three recoverers 10d, 10e, and 10f.
Furthermore, it is only necessary to arrange one common waste liquid transfer pump 80 for the two primary separation tanks 50A and 50B.
Thereby, equipment can be shared and equipment costs as a whole can be reduced.

  Next, the retracting function of the coating gun cleaning apparatus 1 will be described with reference to FIGS.

  As shown in FIGS. 5 and 6, the platform 101 of the painting robot 100 is turned (swing) or moved forward (slide) in a direction approaching a work (for example, a bumper) W, that is, forward (leftward in the figure). A stay is installed. 5 and 6 show the stay 102 that rotates.

In the case of the turning stay 102, the base portion of the stay is supported so as to be rotatable around a spindle provided on the gantry 101. A recovery unit 10 of the cleaning device 1 is installed at the tip of the swivel stay 102. The circulation path 40 is not shown.
The swivel stay 102 swivels between a retracted position (see FIG. 5) where the tip of the stay does not protrude forward from the base 101 of the painting robot 100 and a use position (see FIG. 6) protruding forward from the base 101. Configured to be possible.

Although not shown, in the case of an advance / retreat stay, the rear portion of the stay is supported by the gantry 101 so as to be able to advance / retreat in the front-rear direction (left-right direction in the figure). At the front part of the stay, the collecting device 10 of the cleaning device 1 is installed.
The advance / retreat stay is configured so that the front portion of the stay can advance and retreat between a retracted position where the coating robot 100 does not protrude forward from the gantry 101 and a use position where the stay protrudes forward from the gantry 101.

During the painting by the painting robot 100, as shown in FIG. 5, in order to prevent the collecting device 10 that is not used from interfering with the operation of the painting robot 100 and to prevent the stay 102 from being contaminated by painting dust, Hold in the storage position. Thereby, the collection device 10 is held at a retracted position that does not protrude forward from the gantry 101 of the painting robot 100.
In order to prevent the collection device 10 from being contaminated by the paint dust, for example, a cover may be arranged at the storage position so that the collection device 10 is covered with this cover.

  During the color change of the painting robot 100, the stay 102 is turned or advanced to the use position as shown in FIG. Thereby, the collection device 10 is advanced to the use position and collects the waste liquid.

  When automatic control is not performed, the collection device 10 is pulled out to the use position only during the production operation time period, and stores after operation and holidays.

DESCRIPTION OF SYMBOLS 1 ... Coating gun washing | cleaning apparatus 10 ... Recovery machine 20 ... Washing tank 30 ... Recovery tank 40 ... Circulation path 50 ... Primary separation tank (separation tank)
60 ... Recovery liquid circulation pump (circulation pump)
70: Filter

Claims (6)

A paint gun cleaning method for cleaning a paint gun when changing colors,
A step of discharging waste liquid containing paint into the cleaning liquid in a state where the tip of the coating gun is immersed in a cleaning tank containing the cleaning liquid;
A method for cleaning a paint gun, comprising: After the step, the step of positioning the tip of the coating gun above the liquid level of the cleaning tank and discharging the cleaning liquid from the coating gun;
The coating gun cleaning method according to claim 1, further comprising: This is a paint gun cleaning device that cleans the paint gun when changing colors.
A cleaning tank in which waste liquid containing paint is discharged into the cleaning liquid and the cleaning liquid is always kept overflowing;
A recovery tank disposed outside the cleaning tank and recovering liquid overflowing from the cleaning tank;
An apparatus for cleaning a paint gun, comprising: A circulation path for recovering the cleaning liquid from the liquid recovered in the recovery tank and supplying it to the lower part of the cleaning tank;
The said circulation path is equipped with the separation tank which isolate | separates the liquid collect | recovered by the said collection tank into the high specific gravity liquid with many paints, and the low specific gravity liquid with many washing | cleaning liquids by the difference in specific gravity. Painting gun cleaning equipment. The circulation path is
A circulation pump for supplying the low specific gravity liquid from the separation tank to the washing tank;
A filter that filters the low specific gravity liquid delivered from the circulation pump to produce the cleaning liquid;
The coating gun cleaning apparatus according to claim 4, further comprising:   The upper portion of the recovery tank has a cylindrical portion positioned above the upper portion of the cleaning tank, and includes an air blower that blows air slightly downward toward the center from the opening of the upper portion of the cylindrical portion. The cleaning device for a coating gun according to any one of claims 3 to 5.

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