JP2009183824A - Coating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating device which can enhance handleability of a spray gun during coating operation and ensure successful application of a coating material even in case it is of high viscosity. <P>SOLUTION: This coating device 1 comprises the following components: a spray gun 2 for jetting a coating material, air piping 7 for supplying compressed air it, a coating material container 18 mounted on it, a coating material tank 50 for storing the coating material, and coating material supply piping 48 and coating material return piping 49 connected with the coating material container 18 in such a state that one end side of the piping are connected with the coating material tank 50 and the other end side can be removed. In the coating device 1 in which the coating material can be replenished to the interior of the coating material container 18 from the coating material tank 50 in such a state that the coating material supply piping 48 and the coating material return piping 49 are connected with the coating material container 18, an air introduction pipe 28 is provided for introducing pressurizing air into it. Besides, the air introduction pipe 28 is equipped with a valve part (a check valve 30) which opens when the pressurizing air is supplied into the air introduction pipe 28 and closes when the coating material is replenished into the coating material container 18. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a coating apparatus. More specifically, the present invention can improve the handleability of a spray gun at the time of a painting operation and can satisfactorily paint even when a high viscosity paint is used. The present invention relates to a coating apparatus that can prevent backflow to an air inlet for pressure and can easily and reliably switch between a painting operation and a paint replenishment operation.

  As a conventional coating apparatus, an apparatus employing a suction type spray gun is known (for example, see Patent Document 1). Moreover, what employ | adopted a pressurization type spray gun is known as another conventional coating apparatus (for example, refer patent document 2).

  In Patent Document 1, as shown in FIGS. 8 and 9, a suction type spray gun 102 that sprays paint, an air pipe 107 that supplies compressed air to the spray gun 102, and a spray gun 102 are provided. The paint container 118 to be mounted, the paint tank 150 for storing paint, the paint supply pipe 148 connected to the paint container 118 with one end connected to the pressure feed pump of the paint tank 150 and the other end detachable, and the paint A coating apparatus 101 including a return pipe 149 and an air vent valve 160 provided in the paint container 118 and manually operated is disclosed. Thereby, at the time of a painting operation, the operability of the spray gun 102 with the paint supply pipe 148 and the paint return pipe 149 removed from the paint container 118 of the spray gun 102, that is, with only the air pipe 107 connected to the spray gun 102. Can be painted with higher In addition, when the paint is refilled, the paint can be automatically refilled from the paint tank 150 into the paint container 118 with the paint supply pipe 148 and the paint return pipe 149 connected to the paint container 118 of the spray gun 102.

  Patent Document 2 discloses a pressurized spray gun for injecting paint, an air pipe for supplying compressed air to the spray gun, a paint container attached to the spray gun, and compressed air flowing through the air pipe. And a bypass pipe for introducing air into the paint container as pressurized air. As a result, the spray gun can be painted with improved handleability while only the air pipe is connected to the spray gun. The replenishment of the paint is performed manually by removing the cover of the spray gun paint container.

JP 7-251102 A JP 2007-130521 A

  However, since the coating apparatus 101 of Patent Document 1 is configured to suck the paint in the paint container 118 with respect to the spray gun 102, when using a high-viscosity paint (water-based paint or the like), the paint is sucked well. Insufficient paint will be sprayed and unevenness will occur. In addition, the air vent valve 160 is opened to hold the paint container 118 at a pressure equal to the atmospheric pressure during the painting operation to suck the paint, while the air vent valve 160 is closed to prevent the paint from overflowing when the paint is replenished. It is necessary to manually open and close the air vent valve 160, and there is a risk that problems such as forgetting to close the air vent valve 160 occur.

  On the other hand, since the coating apparatus of Patent Document 2 is configured to pressurize and feed the paint in the paint container against the spray gun, relatively good coating can be performed even when a high viscosity paint is used. However, the replenishment of the paint is troublesome because it is necessary to manually remove the paint container lid. In addition, it is conceivable that the painting apparatus of Patent Document 2 is an automatic paint replenishment type like the painting apparatus of Patent Document 1, but in this case, when the paint is replenished, the air is supplied into the bypass pipe from the pressurizing air inlet of the paint container. Otherwise, the paint may flow backward.

  The present invention has been made in view of the above situation, and can improve the handleability of a spray gun at the time of painting work and can be applied satisfactorily even when a high viscosity paint is used. It is an object of the present invention to provide a coating apparatus that can prevent backflow of paint to the air inlet for pressurization and that can easily and reliably switch between painting work and paint replenishment work.

The present invention is as follows.
1. A spray gun for injecting paint, an air pipe for supplying compressed air to the spray gun, a paint container attached to the spray gun, a paint tank for storing paint, and one end connected to the paint tank and the other A paint supply pipe and a paint return pipe connected to the paint container in a state where the end side is removable, and the paint tank is connected to the paint container from the paint tank with the paint supply pipe and the paint return pipe connected to the paint container. In a painting device that refills the container with paint,
An air introduction pipe for introducing pressurized air into the paint container is further provided, and the air introduction pipe is opened when pressurized air is supplied to the air introduction pipe, and the paint is introduced into the paint container. A coating device characterized in that a valve portion that is closed when refilling is provided.
2. One end side of a bypass pipe that supplies compressed air flowing through the air pipe as the pressurizing air to the air introduction pipe is connected to the air introduction pipe. The coating equipment described.
3. 2. A pressure adjusting unit that can adjust the pressure of compressed air flowing through the bypass pipe. The coating equipment described.

According to the coating apparatus of the present invention, at the time of painting work, the handling of the spray gun is improved with the paint supply pipe and the paint return pipe removed from the spray gun paint container, that is, with only the air pipe connected to the spray gun. Can be painted. In addition, when the paint is replenished, the paint can be automatically replenished from the paint tank into the paint container with the paint supply pipe and the paint return pipe connected to the paint container of the spray gun. In addition, since an air introduction pipe for introducing pressurized air into the paint container is further provided, the paint in the paint container is pressurized and fed to the spray gun. Etc.) can be applied well. The air introduction pipe is provided with a valve portion that is opened when pressurized air is supplied to the air introduction pipe and closed when the paint container is replenished with paint. The closed valve portion prevents the backflow of the paint in the paint container to the air introduction pipe. Furthermore, it is not necessary to manually open and close the air vent valve when switching between the painting operation and the paint replenishment operation as in the prior art, and the switching between the painting operation and the paint replenishment operation can be performed easily and reliably.
In addition, when one end side of a bypass pipe that supplies compressed air flowing through the air pipe as the pressurizing air to the air introduction pipe is connected to the air introduction pipe, the air introduction pipe is connected to the air introduction pipe via the bypass pipe. The compressed air supplied to the spray gun is branched and supplied as pressurized air. Therefore, the entire coating apparatus can be made more compact as compared with the case where the air introduction pipe and the compressed air supply source are connected by the supply pipe.
Furthermore, in the case of further comprising a pressure adjusting unit capable of adjusting the pressure of the compressed air flowing through the bypass pipe, the pressure adjusting unit adjusts the pressure of the compressed air flowing through the bypass pipe to thereby apply various viscosity paints. Can be easily accommodated.

  The coating apparatus according to this embodiment includes a spray gun, an air pipe, a paint container, a paint tank, a paint supply pipe, a paint return pipe, and an air introduction pipe described below.

  The “spray gun” is not particularly limited in its structure, type, use and the like as long as it sprays paint. As a mixing form of the paint and air in this spray gun, for example, an external mixing type, an internal mixing type, a system in which external mixing and internal mixing are combined can be exemplified.

  The “air pipe” is not particularly limited in structure, shape, material, etc., as long as compressed air is supplied to the spray gun. For example, as shown in FIGS. 1 and 2, the air pipe 7 is connected to a pipe connection portion 5 connected to an air flow path 9 formed at one end of the air pipe 7 and connected at the other end to the inside of the spray gun 2. Can be connected.

  As long as the “paint container” is attached to a spray gun, its structure, shape, material, etc. are not particularly limited. For example, as shown in FIG. 3, the paint container 18 has a container main body 22 that is open at the top and can store paint, and an upper opening of the container main body is closed, and one end side of an air introduction pipe 28 that will be described later is provided. And a lid member 23 to be connected.

  The “paint tank” is not particularly limited in its structure, shape, material and the like as long as it stores the paint. This paint tank can have, for example, a pressure feed pump to which one end side of a paint supply pipe described later is connected, or a suction pump to which one end side of a paint return pipe described later is connected.

As long as the “paint supply pipe” and “paint return pipe” are connected to the paint container with one end connected to the paint tank and the other end detachable, the structure, shape, material, etc. are not particularly limited. .
Here, in the present coating apparatus, normally, the painting operation is performed with the spray gun with the paint supply pipe and the paint return pipe removed from the paint container, and the paint supply pipe and the paint return pipe are connected to the paint container. In the paint tank, the paint is refilled into the paint container.

The “air introduction pipe” is not particularly limited in its structure, shape, material, and the like as long as it is for introducing pressurized air into the paint container. The air introduction pipe is provided with a valve portion that is opened when pressurized air is supplied to the air introduction pipe and is closed when the paint container is replenished with paint.
The valve unit may include, for example, a sensor that detects the supply of pressurizing air to the air introduction pipe, and an electromagnetic valve that is controlled to open and close based on the detection result of the sensor. From the viewpoint of being able to be configured simply and inexpensively, it is preferable that the valve portion is a check valve that allows the flow of the pressurizing air in the introduction direction to the paint container and restricts it in the counter-introduction direction. For example, as shown in FIG. 3, the check valve 30 includes a valve body 33 that is movably supported in an air introduction pipe 28 so as to open and close the flow path 28a, and the valve body is made of pressurizing air. And a spring 34 biased in the anti-introduction direction.

  The air introduction pipe may be connected to, for example, the other end of one long supply pipe whose one end is connected to a compressed air supply source. From the viewpoint that the air introduction pipe can be made more compact, the air introduction pipe It is preferable that one end side of a bypass pipe for supplying compressed air flowing through the air pipe as pressurized air is connected to the pipe. The other end side of the bypass pipe can be connected to, for example, a pipe connection portion of the spray gun or connected to the air pipe.

When the bypass pipe is provided as described above, the present coating apparatus can further include, for example, a pressure adjusting unit capable of adjusting the pressure of the compressed air flowing through the bypass pipe. The pressure adjusting unit can be provided, for example, at the end or in the middle of the bypass pipe, or can be provided in the air introduction pipe.
For example, as shown in FIG. 5, the pressure adjusting unit 36 includes a main body 37 that is attached to the pipe connecting portion 5 of the spray gun and to which the other end side of the bypass pipe 29 is connected. The pressure of compressed air flowing through the branch path can be adjusted by operating the operation section 38 provided on the branch path and the branch path whose side is connected to the flow path of the pipe connection section and the other end side is connected to the flow path of the bypass pipe. A pressure adjusting mechanism. Thereby, a bypass pipe and a pressure adjustment part can be easily arrange | positioned, without changing the design of the internal structure of a spray gun significantly.

  Hereinafter, the present invention will be specifically described with reference to the drawings.

(1) Configuration of Coating Apparatus The coating apparatus 1 according to this embodiment includes a handy type spray gun 2 as shown in FIG. A pipe connecting portion 5 is provided on the lower end side of the grip portion 3 of the spray gun 2. The other end portion of the flexible air piping 7 whose one end is connected to the compressor 6 is detachably attached to the pipe connecting portion 5. Further, as shown in FIG. 2, air flow paths 9 a to 9 e for guiding the compressed air supplied from the air pipe 7 to the air cap 8 are formed inside the spray gun 2. An air hole 10 for ejecting compressed air is formed in the corner 8a of the air cap 8 to form an elliptical coating pattern. A paint hole 11 for ejecting paint is formed in the center of the air cap 8. In addition, paint passages 12 a and 12 b that are continuous with the paint hole 11 are formed in the spray gun 2. Furthermore, a needle valve 13 for opening and closing the paint hole 11 is slidably provided inside the spray gun 2. An open / close valve 14 for opening and closing the air flow path 9 is fixed to the proximal end side of the needle valve 13. By operating the trigger 16, the needle valve 13 and the opening / closing valve 14 are slid to cause the paint to be ejected from the paint hole 11 and the compressed air to be ejected from the air hole 10.

  The spray gun 2 is provided with a paint connecting portion 17 that forms a paint passage 12 a in the vicinity of the air cap 8. A paint pipe 19 extending from the paint container 18 is connected to the paint connecting portion 17 by a connector 20. As shown in FIGS. 3 and 4, the paint container 18 is provided with a container body 22 that can store paint used for several painting operations by opening the top. A disk-shaped lid member 23 that closes the upper opening is detachably attached to the container body 22. The coating material 19 is fixed to the lid member 23 in a penetrating manner. Then, with the lid member 23 set on the container main body 22, the tip of the paint pipe 19 is disposed near the center of the bottom wall 22 a of the container main body 22.

  A paint supply short pipe 25 and a paint return short pipe 26 are fixed to the bottom wall 22a of the container body 22 in a state where they pass through. The paint supply short pipe 25 is inserted shallowly inside the container main body 22, and a paint nozzle 25 a for discharging the paint toward the bottom wall 22 a of the container main body 22 is provided on the insertion end side (upper end side). It has been. The paint return short tube 26 is inserted deep inside the container main body 22, and an opening 26 a is formed on the insertion end side (upper end side) thereof. As a result, the paint accumulated in the container body 22 flows out from the opening 26a of the paint return short pipe 26 to the outside. Here, the amount of the paint return short tube 26 inserted into the container body 22 is set in consideration of the liquid level of the paint stored in the container body 22. That is, the paint is stored in the container body 22 up to the position of the opening 26a of the paint return short pipe 26.

  A lower end side of an L-shaped air introduction pipe 28 is screwed to the lid member 23. One end side of a flexible bypass pipe 29 is connected to the upper end side of the air introduction pipe 28. A check valve 30 (illustrated as a “valve portion” according to the present invention) is provided in the flow path 28 a formed inside the air introduction pipe 28. The check valve 30 includes a valve body 33 having an abutment surface 32 that abuts against a tapered surface 31 constituting the flow path 28 a of the air introduction pipe 28. The valve body 33 is supported so as to be movable in the axial direction of the air introduction pipe 28, and is urged by a spring 34 in a direction to close the flow path 28 a by abutting the abutting surface 32 against the tapered surface 31. When pressurizing air is supplied into the air introduction pipe 28, the valve body 33 resists the urging force of the spring 34 by the pressurizing air, so that the contact surface 32 separates from the tapered surface 31 and opens the flow path 28a. It is displaced in the direction (downward in FIG. 3). Therefore, the check valve 30 allows the flow of the pressurized air supplied to the air introduction pipe 28 in the direction of introduction into the paint container 18 and restricts it in the direction of anti-introduction.

  The pipe connecting portion 5 of the spray gun 2 is provided with a pressure adjusting portion 36 as shown in FIG. The pressure adjusting unit 36 includes a main body 37 that is attached to the pipe connecting unit 5 and to which the other end of the bypass pipe 29 is connected. In the main body 37, a branch path (not shown) is formed in which one end side is connected to the flow path of the pipe connection portion 5 and the other end side is connected to the flow path of the bypass pipe 29. In addition, a known pressure adjusting mechanism (not shown) that can adjust the pressure of the compressed air flowing through the branch path by operating the rotation operation unit 38 is provided in the main body 37.

  As shown in FIG. 6, a fitting portion 40 having a valve mechanism 41 capable of opening and closing a flow path 40a formed therein is provided at the lower ends of the paint supply short tube 25 and the paint return short tube 26. It is screwed. The fitted portion 42 into which the fitting portion 40 is fitted has a valve mechanism 43 that can open and close a flow path 42a formed therein. Further, a lock mechanism 44 that holds the fitting state with the fitting portion 40 is provided on the outer peripheral side of the fitted portion 42. And these fitting part 40 and the to-be-fitted part 42 are mutually fitted, while each flow path 40a, 42a formed in both parts by the valve mechanisms 41 and 43 is opened. In a state in which is released, the respective flow paths 40a, 42a formed in both parts by the valve mechanisms 41, 43 are closed.

  As shown in FIG. 7, the fitted portion 42 is attached to a gantry 47 that constitutes a gun support device 46 that supports the spray gun 2. One end side of the paint supply pipe 48 is connected to the fitted part 42 into which the fitting part 40 of the paint supply short pipe 25 is fitted via a stop valve and a pressure reducing valve (not shown). The base end portion of the paint supply pipe 48 is connected to a pressure feed pump (not shown) of the paint tank 50. Further, one end side of the paint return pipe 49 is connected to the fitted portion 42 into which the fitting portion 40 of the paint return short pipe 26 is fitted via a stop valve (not shown). The base end portion of the paint return pipe 49 is connected to the return space of the paint tank 50.

  An operation mechanism 53 is provided on the support base 52 fixed on the gantry 47. The operating mechanism 53 has a handle portion 54 that is supported by the support base 52 so as to be pivotable up and down, and a substantially L-shape that is connected to the distal end side of the handle portion 54 and is supported by the support base 52 so as to be pivotable up and down. The action part 55 is provided. When the handle portion 54 is turned downward, the action portion 55 acts on the lock mechanism 44 so that the locked state of the fitting portion 40 and the fitted portion 42 is released. When the spray gun 2 is set on the gun support device 46, the handle portion 54 is rotated downward to cause the action portion 55 to act on the lock mechanism 44 so that the fitting portion 40 and the fitting portion 42 are moved. In a state where the locked state is released, the fitting portion 40 on the spray gun 2 side is fitted to the fitted portion 42 on the gun support device 46 side. Thereafter, when the hand is released from the handle portion 54, the fitting portion 40 and the fitted portion 42 are held in a locked state by the action of a spring constituting the lock mechanism 44. Thereby, the spray gun 2 is fixed to the gun support device 46.

(2) Operation of the coating apparatus Next, the operation of the coating apparatus 1 having the above configuration will be described.
During painting standby, as shown in FIG. 7, the spray gun 2 is set on the gun support device 46, and the paint container 18 of the spray gun 2 is connected to the paint supply pipe 48 and the paint return pipe 49. . As a result, the paint (pressure paint) fed from the paint tank 50 through the paint supply pipe 48 is supplied into the paint container 18 through the paint supply short pipe 25. At this time, the paint is discharged from the paint nozzle 25a of the paint supply short tube 25 toward the bottom wall 22a of the container body 22 (see FIG. 3). Then, the paint remaining in the vicinity of the bottom surface is pushed up by the discharged paint, and the paint is stirred inside the paint container 18. The paint in the paint container 18 is returned to the paint tank 50 through the paint return pipe 49 from the opening 26 a of the paint return short pipe 26.

  During the above-described paint standby, the air pipe 7 is disconnected from the pipe connection portion 5 of the spray gun 2, and no pressurized air is supplied into the air introduction pipe 28 of the paint container 18. Therefore, in the check valve 30, as shown in FIG. 3, the valve body 33 is held at a position where the flow path 28 a is closed by the biasing force of the spring 34, and is supplied into the paint container 18 by the check valve 30. The pressurized paint is prevented from flowing back into the air introduction pipe 18.

  Next, during the painting operation, the handle portion 54 of the operation mechanism 53 is pushed down to release the locked state of the fitting portion 40 and the fitted portion 42. In this state, the spray gun 2 is lifted to remove the pair of fitting portions 40 from the pair of fitted portions 42 simultaneously. At this time, the flow path 40a of the fitting part 40 and the flow path 42a of the fitted part 42 are automatically closed by the valve mechanisms 41 and 43, respectively. Next, if the air pipe 7 is connected to the pipe connecting portion 5 of the spray gun 2, the spray gun 2 can be operated to perform a normal painting operation. The painting operation is performed using the paint in the paint container 18.

  During the above-described painting operation, compressed air supplied to the air pipe 7 via the bypass pipe 29 is branched and supplied into the air introduction pipe 28 of the paint container 18 as pressurization air. The valve body 33 of the check valve 30 is displaced in the direction of opening the flow path 28a against the urging force of the spring 34 by the compressed air supplied into the air introduction pipe 28, and is smoothly compressed into the paint container 18. Air is introduced. Accordingly, by operating the trigger 16 of the spray gun 2, the paint in the paint container 18 is pressurized and fed to the spray gun 2 through the paint pipe 19.

(3) Effects of the Embodiment As described above, in the present embodiment, since the paint supply pipe 48 and the paint return pipe 49 are detachably connected to the paint container 18, the paint is supplied from the paint container 18 of the spray gun 2 during the painting operation. In a state where the pipe 48 and the paint return pipe 49 are removed, that is, in a state where only the air pipe 7 is connected to the spray gun 2, it is possible to improve the handling of the spray gun 2 and perform painting. In addition, when the paint is replenished, the paint can be automatically replenished from the paint tank 50 into the paint container 18 with the paint supply pipe 48 and the paint return pipe 49 connected to the paint container 18 of the spray gun 2. In addition, since the paint is circulated between the paint container 18 and the paint tank 50 when the paint is replenished, the precipitation of the paint in the paint container 18 can be suppressed.

  Further, in the above embodiment, the paint container 18 is provided with the air introduction pipe 28 for introducing the pressurizing air therein, so that the paint in the paint container 18 is pressurized and fed to the spray gun 2. It is a form and can be satisfactorily painted even when a high viscosity paint is used.

  Further, in the above embodiment, the flow of the pressurized air supplied to the air introduction pipe 28 is allowed in the direction of introduction into the paint container 18 and restricted in the counter-introduction direction in the air introduction pipe 28 and is closed when the paint is replenished. Since the check valve 30 that is in the state is provided, the check valve 30 prevents the backflow of the paint in the paint container 18 to the air introduction pipe 28 when the paint is replenished. Further, it is not necessary to manually open and close the air vent valve when switching between the painting operation and the paint replenishment operation as in the prior art, and the switching between the painting operation and the paint replenishment operation can be performed easily and reliably.

  In the above embodiment, since the other end side of the bypass pipe 29 whose one end side is connected to the pipe connecting portion 5 of the spray gun 2 is connected to the air introduction pipe 28, the air introduction pipe 28 is connected via the bypass pipe 29. The compressed air supplied to the spray gun 2 is branched and supplied as pressurized air. Therefore, the entire coating apparatus 1 can be made more compact than the one in which the air introduction pipe 28 and the compressor 6 are connected by a single long supply pipe.

  Further, in the above embodiment, the pressure adjusting portion 36 is provided in the pipe connecting portion 5 of the spray gun 2, and one end side of the bypass pipe 29 is connected to the pipe connecting portion 5 through the pressure adjusting portion 36. By operating the fingertip of the operation unit 38 and adjusting the pressure of the compressed air flowing through the bypass pipe 29 by the pressure adjusting unit 36, it is possible to easily cope with coating of paints of various viscosities.

  Further, in the above embodiment, the paint container 18, the paint supply pipe 48 and the paint return pipe 49 are attached and detached using the fitting part 40 and the fitted part 42, and the fitting part 40 and the fitted part are fitted. In the state where 42 is fitted, the respective flow paths 40a, 42a of both parts are opened, and in the state where the fitting of the fitting part 40 and the fitted part 42 is released, the flow paths 40a, 42a of both parts are opened. Since it is configured to be closed, it is very easy to attach and remove the paint supply pipe 48 and the paint return pipe 49 to the paint container 18.

  In the above-described embodiment, the paint nozzle 25 a that ejects the pressurized paint supplied from the paint supply pipe 48 toward the bottom surface of the paint container 18 is provided inside the paint container 18. After the applied paint collides with the bottom surface of the paint container 18, the paint circulates inside the paint container 18, and the paint can be more difficult to settle inside the paint container 18.

  Further, in the above embodiment, the operation mechanism 53 capable of simultaneously operating the pair of fitting portions 40 and the fitted portions 42 corresponding to the paint supply pipe 48 and the paint return pipe 49 is provided on the mount 47 of the gun support device 46. Since it is provided, it is possible to more easily attach and remove the paint supply pipe 48 and the paint return pipe 49 from the paint container 18. Further, since the paint supply pipe 48 and the paint return pipe 49 can be removed from the paint container 18 at the same time, the amount of paint in the paint container 18 does not change during the removal operation.

  In the present invention, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention depending on the purpose and application. In other words, in the above-described embodiment, the form in which the handy type spray gun 2 is employed is exemplified, but the present invention is not limited to this.

  Moreover, in the said Example, although the coating device 1 comprised from the one paint tank 50 and the compressor 6 and the one spray gun 2 was illustrated, it is not limited to this, For example, one paint tank and The configuration may be such that paint and air are supplied from a compressor to a plurality of spray guns.

  Further, in the above-described embodiment, the spray gun 2 that does not generate a vacuum portion due to the air flow at the front end side of the paint hole 11 of the air cap 8 in order to forcibly send out the paint is illustrated. For example, you may employ | adopt the spray gun which produces | generates the vacuum part by an airflow in the front end side of a coating-material hole.

  Widely used as a painting technique using a spray gun.

It is explanatory drawing for demonstrating the coating apparatus which concerns on an Example, (a) shows a front view, (b) shows a side view. It is a longitudinal cross-sectional view of a spray gun. It is a longitudinal cross-sectional view of a paint container. It is A arrow directional view of FIG. It is explanatory drawing for demonstrating a piping connection part, (a) shows a front view, (b) shows a side view. It is explanatory drawing for demonstrating a fitting part and a to-be-fitted part. It is explanatory drawing for demonstrating a paint replenishment operation | work. It is explanatory drawing for demonstrating the conventional coating apparatus, (a) shows a front view, (b) shows a side view. It is a longitudinal cross-sectional view of the conventional paint container.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1; Coating apparatus, 2; Spray gun, 7; Air piping, 18; Paint container, 28; Air introduction pipe, 29; Bypass pipe, 30; Check valve, 36; Paint return pipe, 50; paint tank.

Claims (3)

A spray gun for injecting paint, an air pipe for supplying compressed air to the spray gun, a paint container attached to the spray gun, a paint tank for storing paint, and one end connected to the paint tank and the other A paint supply pipe and a paint return pipe connected to the paint container in a state where the end side is removable, and the paint tank is connected to the paint container from the paint tank with the paint supply pipe and the paint return pipe connected to the paint container. In a painting device that refills the container with paint,
An air introduction pipe for introducing pressurized air into the paint container is further provided, and the air introduction pipe is opened when pressurized air is supplied to the air introduction pipe, and the paint is introduced into the paint container. A coating device characterized in that a valve portion that is closed when refilling is provided.   The coating apparatus according to claim 1, wherein one end side of a bypass pipe that supplies compressed air flowing through the air pipe as the pressurizing air to the air introduction pipe is connected to the air introduction pipe.   The coating apparatus of Claim 2 further equipped with the pressure adjustment part which can adjust the pressure of the compressed air which flows through the said bypass pipe.

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