JP2011189247A - Coating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating system in which the flow of a coating material is not stopped in all passages even in any of a coating state or a stand-by state. <P>SOLUTION: The coating apparatus 100 is provided with a coating material storage container 2, a coating material spray device 1, a coating material supply path L1 for connecting the coating material storage container 2 to the coating material spray device 1, a coating material discharge path L2 for connecting the coating material spray device 1 to the coating material storage container 2, a non-full close cut-off valve 8 provided to the coating material discharge path L2 and movable between an open position and a non-full close position, a non-full close cut-off valve driving part 81 for moving the position of the non-full close cut-off valve 8, a detecting part 91 for detecting that the coating material is sprayed from the coating material spray device 1, and a control part 92 for moving the position of the non-full close cut-off valve 8 to the non-full close position when it is detected by the detecting part 91 that the coating material is spayed from the coating material spray device and moving the position of the non-full close cut-off valve 8 to the open position when it is not detected by the detecting part 91 that the coating material is sprayed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a coating apparatus for coating an object to be coated such as a car body or a bumper of an automobile.

  2. Description of the Related Art Conventionally, a coating apparatus has been used for coating an object to be painted such as an automobile body or a bumper. Such a coating apparatus connects a paint spraying device that sprays paint onto an object to be coated, a paint storage container that stores paint, a paint storage container and a paint spraying device, and connects the paint storage container to the paint spraying device. A paint supply path for supplying the paint (see, for example, Patent Document 1).

  According to the above coating apparatus, in a coating state in which an object is coated, the paint stored in the paint container is circulated through the paint supply path and the paint spraying device and is sprayed from the paint spraying device. However, in a standby state in which painting is not performed, the distribution of the paint stops and stays in the paint supply path and the paint injection device. As a result, the pigment contained in the staying paint sometimes settles in the paint supply path and the paint spraying device, which causes piping contamination.

JP 2005-87849 A

  In view of this, a coating apparatus having a paint circulation path connecting the paint supply path and the paint container has been proposed. According to this coating apparatus, it is possible to prevent the paint from staying by circulating the paint contained in the paint container in the standby state via the paint supply path and the paint circulation path. However, in the above-described coating apparatus, in the standby state, it was not possible to prevent the suspension of the distribution of the paint in the paint supply path on the downstream side (paint injection apparatus side) and in the paint injection apparatus. .

  Accordingly, an object of the present invention is to provide a coating system in which the distribution of the paint is not stopped in all the routes in both the painted state and the standby state.

  The present invention relates to a paint container, a paint spray device, a paint supply path for supplying paint from the paint container to the paint spray apparatus, and a paint discharge path for discharging paint from the paint spray device to the paint container. And a non-fully closed position that is provided in the paint discharge path and opens the paint flow path toward the paint container in the paint discharge path and a non-fully closed position that blocks a part of the flow path. The present invention relates to a coating apparatus including a fully closed shutoff valve.

  A detecting unit that detects that paint is sprayed by the paint spraying device; and when the detecting unit detects that paint is sprayed, the position of the non-fully closed shutoff valve is changed from the open position to the A control unit that moves to the non-fully closed position and moves the position of the non-fully closed shut-off valve from the non-fully closed position to the open position when the detection unit does not detect that the paint is sprayed; It is preferable to provide.

  The paint spraying device includes a paint spraying device main body, a paint chamber formed inside the paint spraying device main body and storing paint, and provided at a front end side of the paint spraying device main body and stored in the paint chamber. A paint discharge section for discharging the paint, a paint introduction path for introducing the paint supplied from the paint supply path formed in the paint injection apparatus body, and the paint chamber formed in the paint injection apparatus body. A paint lead-out path for leading the paint stored in the paint discharge path, and an air introduction path for introducing air into the interior of the paint sprayer main body, and the detection unit circulates through the air introduction path. Detecting the pressure of air, the control unit moves the position of the non-fully closed shut-off valve from the open position to the non-fully closed position when the detection unit detects a pressure higher than a predetermined value, Pressure above a certain level Preferably but moving the position of the non-fully closing shut-off valve to the open position from the non-fully closed position when not detected.

  The paint introduction path is preferably formed so that the direction in which the paint introduction path extends is shifted from the center of the paint chamber.

  The non-fully closed shut-off valve further includes a non-closed shut-off valve drive unit having a piston connected to a base end side of the non-closed shut-off valve and a cylinder that slidably accommodates the piston. Is formed in a rod shape having a tapered end, and the control unit moves the piston forward when the detection unit detects a pressure higher than a predetermined pressure, thereby setting the non-fully closed shut-off valve to the non-fully closed position. It is preferable that the non-fully closed shut-off valve is moved to the open position by retracting the piston when the detection unit does not detect a pressure exceeding a predetermined level.

  A paint circulation path having one end connected to the paint supply path and the other end connected to the downstream side of the non-fully closed shut-off valve in the paint discharge path; and a connecting portion between the paint supply path and the paint circulation path It is preferable to further comprise a three-way valve provided in the.

  Further, the three-way valve opens a flow path downstream of the connection portion in the paint supply path and closes a part of the flow path of the paint circulation path, and the connection in the paint supply path It is preferable that the flow path on the downstream side of the portion is closed and the second position where the flow path of the paint circulation path is opened can be moved.

  The three-way valve includes a main body having a substantially cylindrical shape, and a spiral groove formed on the peripheral surface of the main body, and the groove is in a state where the three-way valve is located at the first position. It is preferable to form a flow path connecting the paint supply path and the paint circulation path.

  According to the coating apparatus of the present invention, the distribution of the paint is not stopped in all routes in either the painted state or the standby state.

It is a figure which shows the structure of the coating apparatus of this invention. It is a figure which shows the hand gun shown in FIG. FIG. 3 is a sectional view taken along line XX in FIG. 2. It is a figure which shows the distribution | circulation state of the coating material in the standby state of a coating device. It is a figure which shows the distribution | circulation state of the coating material in the coating state of a coating device. It is a figure which shows the washing | cleaning state of a coating device.

Hereinafter, a preferred embodiment of a coating apparatus of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a configuration of a coating apparatus 100 of the present invention. FIG. 2 is a side view showing an embodiment of the coating gun 1, and FIG. 3 is a sectional view taken along line XX of FIG.
As shown in FIG. 1, the coating apparatus 100 according to the present embodiment includes a coating gun 1 as a paint spraying apparatus, a paint tank 2 as a paint container, a paint pump 3, a waste liquid tank 4 that stores waste liquid, A cleaning liquid tank 5 for storing a cleaning liquid such as thinner and an air supply device 6 for supplying air to the coating gun 1 and the like are provided.
The coating apparatus 100 also includes a paint supply path L1 from the paint tank 2 via the paint pump 3 to the paint gun 1, a paint discharge path L2 from the paint gun 1 to the paint tank 2, and one end of the paint supply path L1. Is connected to the paint discharge path L2, the paint circulation path L3 is connected to the paint discharge path L2, the three-way valve 7 provided at the connection portion between the paint supply path L1 and the paint circulation path L3, and the three-way valve that drives the three-way valve 7 A drive unit 71, a cleaning liquid supply path L4 having one end connected to the paint supply path L1 and the other end connected to the cleaning liquid tank 5, and a waste liquid having one end connected to the paint discharge path L2 and the other end connected to the waste liquid tank 4. A non-fully closed shut-off valve 8 provided at a connection portion between the path L5, the paint discharge path L2 and the waste liquid path L5, a non-closed shut-off valve drive unit 81 for driving the non-fully closed shut-off valve 8, and an air supply device Air that supplies air from 6 to the painting gun 1 etc. Comprising a paper path L6, a detection unit 91 for detecting that the paint is injected by the spray gun 1, a control unit 92 for controlling the operation of the non-fully closing the cutoff valve driving unit 81, a.

  As shown in FIG. 2, the painting gun 1 includes a painting gun main body 10, a nozzle 20 as a paint discharge portion provided in the painting gun main body 10, and a rod-like trigger rotatably connected to the painting gun main body 10. Unit 30.

  As shown in FIGS. 1 and 2, the coating gun main body 10 has a gripping portion 11 and a tip portion 12 that bends and extends from one end side of the gripping portion 11, and has a substantially square shape in side view. Composed. The paint gun body 10 includes a paint chamber 40 in which paint is stored, a paint introduction path 50 that introduces paint into the paint chamber 40, and a paint discharge path 60 that supplies the paint stored in the paint chamber 40 to the nozzle 20. In addition, a paint lead-out path 70 for leading the paint from the paint chamber 40 and an air introduction path 80 for introducing air into the interior of the paint gun body 10 are formed.

  The paint chamber 40 is formed inside the distal end portion 12 of the coating gun body 10. More specifically, as shown in FIGS. 2 and 3, the paint chamber 40 includes a circumferential wall portion 42 formed by the inner surface of the coating gun body 10 and formed in a circumferential shape, one end side of the circumferential wall portion 42, and It has a pair of end wall parts 43 arranged on the other end side. That is, the cross-sectional shape of the paint chamber 40 in the direction orthogonal to the longitudinal direction of the tip end portion 12 is configured to be substantially circular. In other words, the inner surface of the peripheral wall portion 42 has a circumferential surface shape.

The paint introduction path 50, the paint discharge path 60, and the paint lead-out path 70 are all configured by through holes formed in the paint gun body 10.
More specifically, as shown in FIG. 3, the coating material introduction path 50 is formed so as to penetrate from the outer surface of the tip portion 12 in the coating gun body 10 toward the peripheral wall portion 42 of the coating material chamber 40. Further, the direction in which the paint introduction path 50 extends is formed so as to deviate from the center 41 of the paint chamber 40. That is, the coating material introduction path 50 is formed offset with respect to the center 41 of the coating material chamber 40.
In the present embodiment, the paint introduction path 50 is in a state where the distal end portion 12 of the coating gun body 10 is arranged along the horizontal direction, and an extension line in the direction in which the paint introduction path 50 extends extends from the center 41 of the paint chamber 40. Is also formed to pass above.

  As shown in FIG. 2, the paint discharge path 60 is directed from the outer surface side of the tip end portion 12 of the coating gun body 10 toward the end wall portion 43 on the tip end side of the pair of end wall portions 43 of the paint chamber 40. It is formed through. The paint discharge path 60 is provided with a paint discharge valve (not shown) that adjusts the amount of paint discharged through the paint discharge path 60.

As shown in FIGS. 2 and 3, the paint lead-out path 70 is formed so as to penetrate from the outer surface of the tip 12 of the paint gun body 10 toward the peripheral wall 42 of the paint chamber 40. Further, the extending direction of the paint outlet path 70 is formed so as to coincide with the center 41 of the paint chamber 40.
In the present embodiment, the paint lead-out path 70 is formed so as to extend upward from the lower surface of the tip end portion 12 in a state where the tip end portion 12 of the coating gun body 10 is arranged along the horizontal direction.

  As shown in FIGS. 1 and 2, the air introduction path 80 extends from the end portion (the other end) of the grip portion 11 in the coating gun body 10 to the tip end of the tip portion 12. The air introduction path 80 is provided with an air supply valve (not shown) that adjusts the amount (pressure) of air introduced through the air introduction path 80.

  As shown in FIGS. 1 and 2, the nozzle 20 is disposed on the distal end side of the distal end portion 12 of the coating gun body 10. In the nozzle 20, the paint supplied from the paint chamber 40 through the paint discharge path 60 and the air introduced through the air introduction path 80 merge to atomize the paint. The atomized paint is discharged (injected) together with air from the tip of the nozzle 20.

  As shown in FIGS. 1 and 2, the trigger portion 30 is connected at one end side to the distal end portion 12 of the coating gun body 10. This trigger part 30 is comprised so that rotation is possible by making a connection part with the front-end | tip part 12 into a rotating shaft. The trigger unit 30 is connected to an air supply valve (not shown), and controls opening and closing of the air supply valve. Specifically, when the trigger part 30 is pulled, that is, when the trigger part 30 is rotated toward the grip part 11, the air supply valve is opened. Further, when the trigger portion 30 is released, that is, when the trigger portion 30 is rotated away from the grip portion 11, the air supply valve is closed and the paint discharge valve is opened.

The paint tank 2 stores paint of a predetermined color supplied to the paint gun 1.
The paint pump 3 sends the paint contained in the paint tank 2 to the paint gun 1 side at a predetermined pressure.
The paint supply path L <b> 1 connects the paint tank 2 and the paint gun 1, and supplies the paint contained in the paint tank 2 to the paint gun 1. The paint supply path L1 includes a first supply path L1a, a second supply path L1b, a third supply path L1c, and a first connection member 110.
The first supply path L1a connects the paint tank 2 and the paint pump 3. One end of the second supply path L1b is connected to the paint pump 3. The second supply path L1b is connected to the third supply path L1c via the first connection member 110. In other words, the first connection member 110 is disposed between the other end of the second supply path L1b and one end of the third supply path L1c, and connects the second supply path L1b and the third supply path L1c.
The first connection member 110 is also connected to a paint circulation path L3 and a cleaning liquid supply path L4, which will be described later. More specifically, the first connection member 110 includes a flow path connecting the second supply path L1b and the third supply path L1c, a flow path connecting the second supply path L1b and the paint circulation path L3, and a cleaning liquid. A flow path connecting the supply path L4 and the third supply path L1c is formed.
The other end of the third supply path L1c is connected to the paint introduction path 50 of the coating gun 1.

The paint discharge path L <b> 2 connects the paint gun 1 and the paint tank 2, and returns the paint discharged from the paint gun 1 to the paint tank 2. The paint discharge path L2 includes a first discharge path L2a, a second discharge path L2b, and a second connection member 120.
One end of the first discharge path L2a is connected to the paint outlet path 70 of the paint gun 1. The first discharge path L2a is connected to the second discharge path L2b via the second connection member 120. That is, the second connection member 120 is disposed between the other end of the first discharge path L2a and one end of the second discharge path L2b, and connects the first discharge path L2a and the second discharge path L2b.
The second connection member 120 is also connected to a paint circulation path L3 and a waste liquid path L5 described later. More specifically, the second connection member 120 includes a flow path connecting the first discharge path L2a and the second discharge path L2b, a flow path connecting the first discharge path L2a and the waste liquid path L5, and paint circulation. A flow path connecting the path L3 and the second discharge path L2b is formed.
The other end of the second discharge path L2b is connected to the paint tank 2.

  The paint circulation path L3 guides part or all of the paint flowing through the paint supply path L1 to the paint discharge path L2 without passing through the paint gun 1. The paint circulation path L <b> 3 has one end connected to the first connection member 110 and the other end connected to the second connection member 120.

  The cleaning liquid supply path L4 supplies a cleaning liquid such as a thinner for cleaning the coating gun 1 and air. One end of the cleaning liquid supply path L4 is connected to the first connection member 110. More specifically, the cleaning liquid supply path L4 is connected to the downstream side of the paint supply path L1 connected to the paint circulation path L3. Further, the cleaning liquid tank 5 and an air supply path L6 described later are connected to the other end side of the cleaning liquid supply path L4.

  The waste liquid path L5 guides the paint and cleaning liquid flowing through the paint discharge path L2 to the waste liquid tank 4 when the coating gun 1 is cleaned. One end of the waste liquid path L5 is connected to the second connection member 120. A waste liquid valve 140 is provided in the waste liquid path L5, and the discharge of paint and cleaning liquid to the waste liquid tank 4 is adjusted by opening and closing the waste liquid valve 140.

  The three-way valve 7 is disposed inside the first connecting member 110. The three-way valve 7 includes a main body 75 having a substantially cylindrical shape, and a spiral groove 76 formed on the peripheral surface of the main body 75. The three-way valve 7 opens the flow path downstream of the connection portion with the paint circulation path L3 in the paint supply path L1, and closes a part of the flow path of the paint circulation path L3 (FIGS. 1 and 4). And a second position where the flow path on the downstream side of the connecting portion in the paint supply path L1 is closed and the flow path of the paint circulation path L3 is opened.

  More specifically, in the state where the three-way valve 7 is located at the first position, the flow path connecting the second supply path L1b and the third supply path L1c in the first connection member 110 is opened. In this state, the flow path connecting the second supply path L1b and the paint circulation path L3 in the first connection member 110 is blocked by the main body 75, but the main body 75 has a spiral groove 76 formed therein. Therefore, the groove portion 76 forms a flow path that connects the second supply path L1b and the paint circulation path L3. That is, in the state where the three-way valve 7 is located at the first position, most of the paint flowing through the second supply path L1b flows to the third supply path L1c side, but one of the paints flowing through the second supply path L1b. The part flows through the flow path formed by the spiral groove 76 to the paint circulation path L3 side.

  In the state where the three-way valve 7 is located at the second position, the flow path connecting the second supply path L1b and the third supply path L1c in the first connection member 110 is completely closed by the main body 75, and the second The flow path connecting the supply path L1b and the paint circulation path L3 is opened. That is, in the state where the three-way valve 7 is located at the second position, the paint flowing through the second supply path L1b flows to the paint circulation path L3 side and does not flow to the third supply path L1c side.

The three-way valve drive unit 71 includes a piston 72 connected to the three-way valve 7, a cylinder 73 that slidably accommodates the piston 72, and is disposed inside the cylinder 73 so as to position the piston 72 in the forward position. And a spring 74 as a biasing member for biasing.
According to the above three-way valve drive unit 71, in a state where a fluid (for example, air) is not supplied to the inside of the cylinder 73 (a state where a predetermined pressure is not applied to the inside of the cylinder 73), the piston 72 is The spring 74 is urged to be in the forward position. In this state, the three-way valve 7 connected to the distal end side of the piston 72 is located at the second position (see FIG. 6).
On the other hand, when a fluid is supplied to the inside of the cylinder 73 and a predetermined pressure is applied to the inside of the cylinder 73, the spring 74 is pressed and the piston 72 moves backward and moves to the retracted position. In this state, the three-way valve 7 is located at the first position (see FIG. 5).

The non-fully closed shut-off valve 8 is disposed inside the second connection member 120. The non-fully closed shut-off valve 8 is formed in a rod shape having a tapered shape on the tip side. The outer diameter of the non-fully closed shut-off valve 8 is configured to be approximately equal to the inner diameter of the downstream flow path among the flow paths connecting the first discharge path L2a and the second discharge path L2b in the second connection member 120. .
The non-fully closed shut-off valve 8 has an open position (see FIGS. 1 and 4) for opening the paint flow path toward the paint tank 2 in the paint discharge path L2, and a non-fully closed position that blocks a part of the flow path. The position (see FIG. 5) and the fully closed position (see FIG. 6) that block all the flow paths are movably arranged.

  More specifically, in the state where the non-fully closed shut-off valve 8 is located at the open position, the flow path connecting the first discharge path L2a and the second discharge path L2b in the second connection member 120 is opened. When the non-fully closed shutoff valve 8 is in the non-fully closed position, the tip of the non-fully closed shutoff valve 8 connects the first discharge path L2a and the second discharge path L2b in the second connecting member 120. It is located in the base end side of the flow path of the downstream side among the flow paths to perform. Here, since the front end side of the non-fully closed shutoff valve 8 has a tapered shape, the first discharge path L2a and the second discharge path L2b in the second connecting member 120 are connected by the non-fully closed shutoff valve 8. A part of the downstream flow path is closed. Further, in a state where the non-fully closed cutoff valve 8 is located at the fully closed position, the tip of the non-fully closed cutoff valve 8 connects the first discharge path L2a and the second discharge path L2b in the second connection member 120. It is inserted into the downstream flow path of the flow paths to block all the flow paths.

  The outer diameter of the non-fully closed shutoff valve 8 is configured to be smaller than the inner diameter of the flow path connecting the first discharge path L2a and the waste liquid path L5 in the second connection member 120. Therefore, even when the non-fully closed cutoff valve 8 is located at any of the open position, the non-fully closed position, and the fully closed position, the presence of the non-fully closed cutoff valve 8 causes the first connection member 120 to The distribution of paint or the like to the flow path connecting the discharge path L2a and the waste liquid path L5 is not hindered.

  The non-fully closed shut-off valve drive unit 81 is disposed inside the cylinder 83, a piston 82 connected to the base end side of the non-closed shut-off valve 8, a cylinder 83 that slidably accommodates the piston 82, and the cylinder 83. And a spring 84 as an urging member that urges the piston 82 to be positioned at the retracted position.

According to the non-fully closed shut-off valve drive unit 81 described above, in a state where no fluid (for example, air) is supplied to the inside of the cylinder 83 (a state where a predetermined pressure is not applied to the inside of the cylinder 83), the piston 82 is biased by the spring 84 and is in the retracted position. In this state, the non-fully closed shut-off valve 8 connected to the tip side of the piston 82 is located in the open position (see FIG. 4).
When a fluid is supplied to the inside of the cylinder 83 and a predetermined pressure is applied to the inside of the cylinder 83, the spring 84 is pressed and the piston 82 moves forward by a predetermined distance. In this state, the non-fully closed shut-off valve 8 is located at the non-fully closed position (see FIG. 5).
From this state, when further fluid is supplied to the inside of the cylinder 83 and a predetermined pressure is further applied to the inside of the cylinder 83, the spring 84 is further pressed and the piston 82 further advances. In this state, the non-fully closed shut-off valve 8 is located at the fully closed position (see FIG. 6).

The air supply device 6 is composed of, for example, an air compressor, and supplies compressed air to the air supply path L6.
The air supply path L6 connects the air supply apparatus 6 to the coating gun 1, the three-way valve drive unit 71, the non-fully closed shutoff valve drive unit 81, and the cleaning liquid supply path L4. The compressed air supplied from the air supply device 6 is supplied to each of these members via the air supply path L6.
An air supply valve 130 is provided on the upstream side of the non-fully-closed shut-off valve drive unit 81 in the air supply path L <b> 6, and supply of air to the non-fully-closed shut-off valve drive unit 81 by opening and closing the air supply valve 130. Is controlling.

The detector 91 detects that the paint has been ejected from the paint gun 1 by measuring the pressure of the air flowing through the air introduction path 80 in the paint gun 1.
The control unit 92 controls the operation of the non-fully closed shut-off valve driving unit 81 based on the detection result of the detection unit 91. Specifically, the control unit 92 opens the air supply valve 130 to supply air into the cylinder 83 when the detection unit 91 detects a pressure greater than or equal to a predetermined value, and supplies the air inside the cylinder 83 with a predetermined value. Apply pressure. Thereby, the position of the non-fully closed shut-off valve 8 is moved from the open position to the non-fully closed position (see FIG. 5). Further, the control unit 92 closes the air supply valve 130 and discharges the air supplied to the inside of the cylinder 83 and discharges the pressure inside the cylinder 83 when the detection unit 91 does not detect a predetermined pressure or more. (Return to normal pressure). As a result, the position of the non-fully closed shut-off valve 8 is moved from the non-fully closed position to the open position (see FIG. 4).

Next, the operation of the above coating apparatus 100 will be described with reference to FIGS.
FIG. 4 is a diagram illustrating a distribution state of the coating material in the standby state of the coating apparatus 100. FIG. 5 is a diagram illustrating a distribution state of the coating material in the coating state of the coating apparatus 100. FIG. 6 is a diagram illustrating a cleaning state of the coating apparatus 100.

First, the operation of the coating apparatus 100 in the standby state will be described with reference to FIG.
In the standby state of the coating apparatus 100, first, the three-way valve drive unit 71 is driven to place the three-way valve 7 at the first position. Further, the waste liquid valve 140 is closed to shut off the waste liquid path L5.
Further, in the standby state of the coating apparatus 100, since the paint is not sprayed from the coating gun 1, the detection unit 91 does not detect a predetermined pressure. Therefore, the control unit 92 drives the non-fully closed cutoff valve driving unit 81 to place the non-fully closed cutoff valve 8 in the open position.

  In this state, the paint pump 3 is driven. Then, the paint stored in the paint tank 2 reaches the first connection member 110 via the first supply path L1a, the paint pump 3, and the second supply path L1b. Here, as shown in FIG. 4, the three-way valve 7 is located at the first position. Therefore, the paint supplied from the second supply path L1b to the first connection member 110 mainly flows toward the third supply path L1c, but a part of the paint flowing through the second supply path L1b is a spiral groove. It flows through the flow path formed by 76 to the paint circulation path L3 side.

  The paint flowing to the third supply path L1c side reaches the paint chamber 40 through the third supply path L1c and the paint introduction path 50. Here, since the paint gun 1 is formed by offsetting the paint introduction path 50 with respect to the center 41 of the paint chamber 40, the paint chamber is caused by the flow of the paint introduced from the paint introduction path 50 into the paint chamber 40. Inside 40, a swirl flow is generated by the paint.

  Next, the paint introduced into the paint chamber 40 is led out from the paint lead-out path 70 and reaches the second connecting member 120 via the first discharge path L2a. Here, the non-fully closed shut-off valve 8 is located at the open position, and the waste liquid valve 140 is closed. Therefore, the paint reaching the second connection member 120 is returned to the paint tank 2 via the second discharge path L2b.

On the other hand, in the first connecting member 110, the paint flowing to the paint circulation path L3 side through the flow path formed by the spiral groove 76 is introduced into the paint circulation path L3. Here, since the groove portion 76 is formed in a spiral shape, the paint flowing through the flow path formed by the groove portion 76 flows as a swirl flow into the paint circulation path L3.
The paint introduced into the paint circulation path L3 is returned to the paint tank 2 via the second connecting member 120 and the second discharge path L2b.

  As described above, in the standby state of the coating apparatus 100, the paint is applied to the paint tank 2, the first supply path L1a, the paint pump 3, the second supply path L1b, the first connection member 110, the third supply path L1c, and the coating gun. 1, the paint tank 2, the first supply path L1a, the paint pump 3, and the second supply path are circulated through the first circulation path C1 via the first discharge path L2a, the second connection member 120, and the second discharge path L2b. The first connection member 110, the paint circulation path L3, the second connection member 120, and the second circulation path C2 passing through the second discharge path L2b are circulated (see FIG. 4).

Next, the operation of the coating apparatus 100 when the standby state is shifted to the coating state will be described with reference to FIG.
When painting, the operator or robot pulls the trigger part 30 of the painting gun 1. When the trigger unit 30 is pulled, an air supply valve (not shown) provided in the air introduction path 80 is opened. Then, the compressed air supplied from the air supply device 6 is supplied to the nozzle 20 through the air supply path L6 and the air introduction path 80, and the pressure of the air flowing through the air introduction path 80 increases. Then, the increase in the pressure of the air flowing through the air introduction path 80 is detected by the detection unit 91.
When the detection unit 91 detects a pressure higher than a predetermined level, the control unit 92 opens the air supply valve 130 to supply air into the cylinder 83 and applies a predetermined pressure to the inside of the cylinder 83. Thereby, the position of the non-fully closed shut-off valve 8 is moved from the open position to the non-fully closed position (see FIG. 5).

  When the position of the non-fully closed cutoff valve 8 is moved from the open position to the non-fully closed position, the flow rate of the paint flowing from the first discharge path L2a to the second discharge path L2b decreases. As a result, the pressure of the paint flowing upstream from the non-fully closed shutoff valve 8 increases. Due to the increase in the pressure of the paint, the paint stored in the paint chamber 40 of the paint gun 1 is supplied to the nozzle 20 through the paint discharge path 60 at a predetermined pressure. Air flowing through the air introduction path 80 is supplied to the nozzle 20. In the nozzle 20, the paint supplied from the paint chamber 40 and the air supplied through the air introduction path 80 join to atomize the paint, and the atomized paint is discharged (injected) together with the air. Is done.

  As described above, in the coating state of the coating apparatus 100, the circulation amount of the paint in the first circulation path C1 is maintained, although the paint circulation amount in the paint discharge path L2 decreases. Further, the circulation state of the paint is also maintained in the second circulation path C2 (see FIG. 5).

Next, the operation for cleaning the coating apparatus 100 will be described with reference to FIG.
When cleaning the coating apparatus 100, first, the three-way valve drive unit 71 is driven to move the three-way valve 7 to the second position. Further, the non-fully closed cutoff valve driving unit 81 is driven to move the non-fully closed cutoff valve 8 to the fully closed position. Further, the waste liquid valve 140 is opened.

Next, the cleaning liquid is supplied from the cleaning liquid tank 5 to the cleaning liquid supply path L4. Further, the air is supplied from the air supply device 6 to the cleaning liquid supply path L4 through the air supply path L6. The supply of cleaning liquid and air to the cleaning liquid supply path L4 is performed alternately. The cleaning liquid and air supplied to the cleaning liquid supply path L4 are discharged to the waste liquid tank 4 via the third supply path L1c, the coating gun 1, the first discharge path L2a, the second connection member 120, and the waste liquid path L5. . Thereby, the coating apparatus 100 (painting gun 1) is cleaned.
Even in this cleaning state, the paint circulation state in the second circulation path C2 is maintained (see FIG. 6).

According to the above coating apparatus 100, there exist the following effects.
When the detection unit 91 detects that the paint gun 1 ejects the paint, a part of the paint discharge path L2 is blocked, and when the detection unit 91 does not detect that the paint gun 1 ejects the paint, the paint A non-fully closed shut-off valve 8 that opens the discharge path L2 is provided. Thereby, when the paint is sprayed from the paint gun 1, the paint pressure that enables the paint to be sprayed from the paint gun 1 can be obtained without stopping the paint flow in the paint discharge path L2. Therefore, in any state of the paint state and the standby state, the circulation of the paint is not stopped in the first circulation path C1. As a result, since the pigment contained in the paint does not settle in the first circulation path C1, pipe contamination is less likely to occur.

  Further, the pressure of the air flowing through the air introduction path 80 is detected by the detection unit 91, and the non-fully closed shut-off valve driving unit 81 is driven by the control unit 92 according to the air pressure detected by the detection unit 91. . Thereby, the position of the non-fully-closed shutoff valve 8 can be appropriately controlled in accordance with the injection of the paint by the paint gun 1. Therefore, the switching between the coating state and the standby state in the coating apparatus 100 can be accurately controlled.

  Further, the non-fully closed shut-off valve driving unit 81 was driven by the air supplied from the air supply device 6. Therefore, since the non-fully closed shut-off valve drive unit 81 is driven by high-pressure air, the position of the non-fully closed shut-off valve 8 can be switched in a short time.

  In addition, the three-way valve 7 that opens the flow path downstream of the connection portion with the paint circulation path L3 in the paint supply path L1 in the state where the paint supply path L1 is located and closes a part of the flow path of the paint circulation path L3 is provided. Provided. Thereby, in any state of the paint state and the standby state, the circulation of the paint is not stopped in all the routes (the first circulation route C1 and the second circulation route C2). As a result, since the pigment contained in the paint does not settle in the first circulation path C1 and the second circulation path C2, pipe contamination is less likely to occur.

  In addition, a spiral groove 76 is provided through which the paint flows from the second supply path L1b to the paint circulation path L3 with the three-way valve 7 positioned at the first position. As a result, the paint flowing through the flow path formed by the groove 76 becomes a swirling flow and flows into the paint circulation path L3. Therefore, even if the flow rate of the paint flowing through the paint circulation path L3 is small, the pigment contained in the paint is unlikely to settle.

  Further, the three-way valve 7 is configured to be movable to a second position that closes the flow path downstream of the connection portion with the paint circulation path L3 in the paint supply path L1 and opens the flow path of the paint circulation path L3. . Therefore, even when the coating gun 1 is washed, the paint circulation state in the second circulation path C2 can be maintained.

  In the coating gun 1, the coating material introduction path 50 is formed to be offset with respect to the center 41 of the coating material chamber 40. Thereby, in the paint chamber 40, a flow in a predetermined direction is generated in the paint stored by the flow of the paint supplied from the paint introduction path 50 to the paint chamber 40 (see FIG. 3). That is, a swirl flow due to the paint is generated inside the paint chamber 40. Therefore, since the paint does not stay in the paint chamber 40, it is possible to prevent the fluidity of the paint stored in the paint chamber 40 from being lowered (occurrence of color retention). As a result, the frequency of cleaning the coating gun 1 can be reduced. Further, since the cleaning liquid for cleaning the coating gun 1 is also introduced into the paint chamber 40 as a swirling flow, the cleaning effect of the paint chamber 40 can be improved. Therefore, the amount of cleaning liquid used for cleaning the coating gun 1 can be reduced.

  Further, the paint chamber 40 is configured to include a circumferential peripheral wall portion 42, and the paint introduction path 50 is formed to open to the peripheral wall portion 42. As a result, the paint supplied from the paint introduction path 50 flows smoothly along the peripheral wall portion 42. Therefore, since the stagnation of the paint inside the paint chamber 40 can be more effectively prevented, the effect of preventing a decrease in the fluidity of the paint stored in the paint chamber 40 (occurrence of color accumulation) can be further improved.

As mentioned above, although preferred embodiment of this invention was described, this invention is not restrict | limited to embodiment mentioned above, It can implement with a various form.
For example, in the present embodiment, the three-way valve drive unit 71 and the non-fully closed shut-off valve drive unit 81 are driven by air pressure, but this is not a limitation. That is, the three-way valve drive unit and the non-fully closed shut-off valve drive unit may be driven by hydraulic pressure.

  Further, in the present embodiment, the detection unit 91 is made to measure the pressure of the air flowing through the air introduction path 80 and detect the injection of the paint from the coating gun 1, but this is not limitative. That is, the detection unit may be caused to detect that the trigger unit has been pulled by an electric signal or the like, and detect the injection of paint from the coating gun.

1 Paint gun (paint sprayer)
2 Paint tank (Paint container)
7 Three-way valve 8 Non-fully closed shut-off valve 10 Paint gun body (paint sprayer body)
20 nozzles (paint discharge part)
DESCRIPTION OF SYMBOLS 40 Paint chamber 41 Center of paint chamber 42 Peripheral wall part 50 Paint introduction path 70 Paint lead-out path 71 Three-way valve drive part 80 Air introduction path 81 Non-closed shut-off valve drive part 91 Detection part 92 Control part 100 Coating apparatus L1 Paint supply path L2 Paint discharge path L3 Paint circulation path

Claims (8)

A paint container;
A paint spraying device;
A paint supply path for supplying paint from the paint container to the paint injection device;
A paint discharge path for discharging paint from the paint spraying device to the paint container;
A non-fully closed position that is provided in the paint discharge path and is movable between an open position that opens a paint flow path toward the paint container in the paint discharge path and a non-closed position that blocks a part of the flow path. A painting apparatus comprising: a shut-off valve; A detection unit for detecting that paint is sprayed by the paint spraying device;
When the detection unit detects that the paint is sprayed, the position of the non-fully closed shut-off valve is moved from the open position to the non-fully closed position, and it is detected that the paint is sprayed by the detection unit. The coating apparatus according to claim 1, further comprising: a control unit that moves the position of the non-fully closed shut-off valve from the non-fully closed position to the open position when not performed. The paint spraying device includes a paint spraying device main body, a paint chamber formed in the paint spraying device main body and storing paint, and a paint provided on the tip side of the paint spraying device main body and stored in the paint chamber. A paint discharge section for discharging the paint, a paint introduction path for introducing the paint supplied from the paint supply path formed in the paint injection apparatus main body into the paint chamber, and formed in the paint injection apparatus main body and stored in the paint chamber. A paint lead-out path for leading the paint to the paint discharge path, and an air introduction path for introducing air into the interior of the paint sprayer body,
The detection unit detects the pressure of air flowing through the air introduction path,
The control unit moves the position of the non-fully closed shut-off valve from the open position to the non-fully closed position when a pressure equal to or higher than a predetermined level is detected by the detection unit, The coating apparatus according to claim 2, wherein the position of the non-fully closed shut-off valve is moved from the non-fully closed position to the open position when not detected.   The coating apparatus according to claim 3, wherein the paint introduction path is formed so that a direction in which the paint introduction path extends is shifted from a center of the paint chamber. A non-fully closed shut-off valve drive unit further comprising: a piston connected to a base end side of the non-closed shut-off valve; and a cylinder that slidably accommodates the piston.
The non-fully closed shut-off valve is formed in a rod shape having a tapered shape on the tip side,
The control unit moves the non-fully closed shut-off valve to the non-fully closed position by moving the piston forward when a pressure greater than or equal to a predetermined value is detected by the detection unit. The coating apparatus according to any one of claims 2 to 4, wherein when not detected, the piston is moved backward to move the non-fully closed shut-off valve to the open position. A paint circulation path having one end connected to the paint supply path and the other end connected to the downstream side of the non-fully closed shut-off valve in the paint discharge path;
The coating apparatus according to any one of claims 1 to 5, further comprising a three-way valve provided at a connection portion between the paint supply path and the paint circulation path.   The three-way valve has a first position that opens a flow path downstream of the connection portion in the paint supply path and closes a part of the flow path of the paint circulation path, and the connection portion in the paint supply path. The coating apparatus according to claim 6, which is configured to be movable between a second position that closes the downstream flow path and opens the flow path of the paint circulation path. The three-way valve includes a main body having a substantially cylindrical shape, and a spiral groove formed on the peripheral surface of the main body.
The coating apparatus according to claim 7, wherein the groove portion forms a flow path that connects the paint supply path and the paint circulation path in a state where the three-way valve is located at the first position.

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