JP7109338B2 - painting system - Google Patents

Description

The present invention relates to a coating system, and more particularly, in a coating system using a spray gun integrally provided with a coating material supply means, by facilitating exchange of the spray gun, coating of a large number of workpieces and color change of the coating material are possible. The present invention relates to a coating system that enables efficient work.

Conventionally, in a coating apparatus, a spray gun for injecting paint onto an object to be coated (hereinafter referred to as a "workpiece") and paint supply means for supplying paint to the spray gun are separate and independent. The paint is supplied from the paint supply means to the spray gun through the paint hose, and the supplied paint is sprayed from the spray gun toward the workpiece.

However, when such a method is adopted, the spray gun and paint hose must be washed each time the paint color is changed, which is troublesome and reduces work efficiency. I was invited. In particular, in recent years, the number of workpieces for high-mix low-volume production has been increasing, so in the conventional method, the reduction in work efficiency due to such cleaning work has led to an increase in costs.

For this reason, the present applicant has in the past developed an invention (hereinafter referred to as "syringe gun") in which a spray gun is integrally provided at the tip of a syringe as paint supply means in order to solve the above-mentioned problems. Proposed.

That is, FIG. 12 is a partial cross-sectional view for explaining the syringe gun. In the figure, a syringe gun 71 has a paint discharge port 72 at its tip, and an O-ring 82 as a sealing member on its outer periphery. and a head portion 75 as a spray gun formed integrally with the syringe portion 73 at the tip of the syringe portion 73. The head portion 75 is provided with an atomizing air supply path 76 and a pattern air supply path 77 which are open near the paint discharge port 72 .

When the syringe gun 71 is used for coating, a piston rod 78 is connected to the piston 74, a movable plate 79 is connected to the piston rod 78, a screw 80 is screwed to the movable plate 79, and a screw is screwed. 80 is connected to a motor 81 , and in this state, the motor 81 is rotated forward or backward, and air is supplied to the atomization air supply path 76 and the pattern air supply path 77 .

Then, the movable plate 79 advances along the screw thread 80, the piston 74 advances via the piston rod 78, and the paint in the syringe portion 73 is discharged to the head portion 75, and the discharged paint is It is atomized by the air supplied from the atomizing air supply path 76, and molded into an arbitrary pattern by the air supplied from the pattern air supply path 77, and is jetted toward the work.

In this way, in the syringe gun described above, the tip of the syringe for supplying the paint is integrally formed with the head as a spray gun for discharging the paint. Since the entire syringe gun is to be replaced in , there is no need to wash the spray gun when replacing the paint, and therefore it is possible to improve work efficiency, and thinner etc. required for cleaning This eliminates the need for a solvent, and it is possible to improve the economic efficiency.

However, in the syringe gun described above, since the piston is advanced within the syringe and the paint in the syringe is discharged to the head, an O-ring is provided around the piston as a sealing material to prevent paint leakage. However, since the O-ring slides against the inner wall of the syringe when the piston moves, the O-ring wears quickly, making it difficult to completely seal the gap between the piston and the inner wall of the syringe.

Further, as described above, the syringe gun described above requires a movable plate 79, a screw screw 80, and a motor 81 as a driving system for advancing the piston and the piston. Since the motor 81 is structurally heavy, it is necessary to reduce the weight of the end effector when attaching the syringe gun to the arm of the painting robot.

Furthermore, as the piston diameter increases, the frictional resistance increases when the piston 53 moves within the syringe portion 54. In such a case, it is necessary to increase the strength of the drive system, resulting in an increase in weight. It can be pointed out that there is a problem of fading.

In this respect, conventionally, a paint bag filled with paint is housed in a container, a working fluid is supplied into the container, and pressure is applied to the paint bag by the working fluid, thereby causing the paint in the paint bag to to the spray gun side has been proposed, and by using this paint cartridge, it is possible to completely prevent paint leakage.

Further, in the past, the applicant of the present invention has integrated a head portion as a spray gun on the tip side of a syringe portion provided with paint inside, and the syringe portion consists of a syringe body and a paint The pouch is composed of a pouch, and the paint pouch is compressed by supplying the working fluid into the syringe body, thereby supplying the paint in the paint pouch from the syringe part to the head part and discharging it from the head part. He proposed an invention (hereinafter referred to as "pouch gun").

According to this pouch gun, the inside of the syringe can be completely sealed, and the piston and it can be moved forward, unlike the conventional method in which the paint in the syringe is discharged by the forward movement of the piston in the syringe. It is possible to achieve weight reduction because a drive system for the motor is not required.

Japanese Patent No. 4398662 Japanese Patent No. 6158073 JP 2008-212857 A Japanese Patent Application Laid-Open No. 2007-319728 JP-A-2007-21452 Japanese Patent Application Laid-Open No. 2006-347606 JP 2005-296750 A

By the way, the above-mentioned pouch gun employs a system in which the working fluid is supplied into the syringe body to press the paint pouch and supply the paint to the head portion, and the working fluid supply means is connected to the syringe portion. Therefore, when replacing the gun, it is necessary to disconnect and reconnect with the means for supplying the hydraulic fluid, which may pose a problem of complicating the work. In the above-mentioned pouch gun, since the air injection means for supplying atomized air or pattern air is connected to the head portion, when the gun is replaced, the connection with the air injection means is released and reconnected. Connection is also required, which may also cause a problem that the work becomes complicated.

Therefore, in a coating system using a spray gun integrally provided with a coating material supply means, the present invention facilitates the replacement of the spray gun, thereby efficiently coating a large number of workpieces and changing the color of the coating material. The challenge is to enable

The coating system of the present invention is
A coating apparatus that includes a coating machine, a hand unit attached to the coating machine, and a spray gun that is detachably attached to the coating machine via the hand unit, and that coats a workpiece to be coated;
a transfer unit for providing unused spray guns to a coating apparatus and collecting used spray guns,
The transfer unit is
a transport rail;
a receiver capable of supporting the spray gun and movable along the transfer rail;
The hand unit
a hydraulic fluid supply joint and a hydraulic fluid discharge joint to which the hydraulic fluid supply means is connected;
an air supply joint to which the air supply means is connected,
The spray gun is
A spray gun body and a paint supply means for supplying paint to the spray gun body are integrally provided,
The spray gun main body includes a paint supply passage having a paint receiving port for receiving the paint supplied from the paint supplying means, and a paint injection port for injecting the paint received from the paint receiving port toward the workpiece. ,
a needle that can open and close the paint injection port by advancing and retreating;
a needle operating means for advancing and retracting the needle;
The tip is opened at an arbitrary point around the paint injection port, and by supplying air around the paint injection port, the paint discharged from the paint injection port is atomized and the atomized paint is sprayed in any pattern. and an air supply path for injecting to the tip side,
The paint supply means is
a casing having a paint outlet communicating with the paint receiving port;
a bag-shaped paint pouch that is housed in a casing and has a paint discharge port connected to a paint discharge part and is filled with paint;
The casing is
a hydraulic fluid supply port connected to the hydraulic fluid supply joint for injecting the hydraulic fluid supplied from the hydraulic fluid supply means into the casing;
a hydraulic fluid discharge port connected to the hydraulic fluid discharge joint for returning the hydraulic fluid injected into the casing to the hydraulic fluid supply means;
an air supply port connected to the air supply joint for supplying air supplied from the air supply means to the air supply path of the spray gun main body,
By supplying the working fluid into the casing through the working fluid supply port, the paint pouch is pressed, and the paint in the paint pouch is discharged from the paint discharge part and supplied to the paint receiving port,
By releasing the connection between the hydraulic fluid supply joint and the hydraulic fluid supply port, the connection between the hydraulic fluid discharge joint and the hydraulic fluid discharge port, and the connection between the air supply joint and the air supply port, as well as being able to remove the spray gun
By connecting the hydraulic fluid supply joint and the hydraulic fluid supply port, the hydraulic fluid discharge joint and the hydraulic fluid discharge port, and the air supply joint and the air supply port, the spray gun can be attached to the coating machine. It is characterized by

In the coating system of the present invention, in a coating system using a spray gun in which a spray gun body is integrated with a coating supply means having a casing containing a coating pouch, the spray gun can be detachably attached to a hand unit attached to the coating machine. , and the spray gun, via the hand unit, presses the paint pouch to supply the paint in the paint pouch to the spray gun body, and the hydraulic fluid supplied to the spray gun body is supplied in order to atomize and inject in an arbitrary pattern.

Therefore, when the spray gun is replaced, it is only necessary to detach the spray gun from the hand unit. Since there is no need to release the spray gun, replacement work of the spray gun is easy, so that it is possible to efficiently paint a large number of workpieces and change paint colors.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an external view showing the entire embodiment of the coating system of the present invention; 1 is a perspective view for explaining a spray gun in an embodiment of a coating system of the present invention; FIG. 1 is a perspective view for explaining a spray gun in an embodiment of a coating system of the present invention; FIG. 1 is a schematic partial cross-sectional view for explaining the structure of a spray gun in an embodiment of a coating system of the present invention; FIG. FIG. 2 is a cross-sectional view for explaining the structure of the spray gun body in the embodiment of the coating system of the present invention; 1 is a perspective view for explaining a spray gun in an embodiment of a coating system of the present invention, showing a state in which a casing is removed; FIG. 1 is a perspective view for explaining a spray gun in an embodiment of a coating system of the present invention, showing a state in which a casing is removed; FIG. 1 is a perspective view for explaining a hand unit in an embodiment of a coating system of the invention; FIG. 1 is a perspective view for explaining a hand unit in an embodiment of a coating system of the invention; FIG. FIG. 2 is a block diagram for explaining hydraulic fluid supply means in the embodiment of the coating system of the present invention; FIG. 4 is a diagram for explaining a transfer unit in an embodiment of the coating system of the present invention; It is a figure for demonstrating the conventional syringe gun.

A coating system of the present invention has a coating device for coating a workpiece to be coated. The coating device has a coating machine and a hand unit attached to the coating machine. , the spray gun is detachably mounted.

Further, the coating system of the present invention has a transfer unit for providing unused spray guns to the coating apparatus and collecting used spray guns. The transfer unit has a transfer rail and a receiving portion that is movable along the transfer rail, and the receiving portion can support the spray gun. It is supposed to move along the transfer rail in the state.

Next, the hand unit has a hydraulic fluid supply joint to which the hydraulic fluid supply means is connected, and a hydraulic fluid discharge joint to which the hydraulic fluid supply means is connected. Equipped with a supply joint.

Further, the spray gun has a spray gun body and paint supply means for supplying paint to the spray gun body, and the spray gun body and the paint supply means are integrated.

The main body of the spray gun has a paint supply path, and the supply path includes a paint receiving port for receiving the paint supplied from the paint supplying means and for spraying the paint received from the paint receiving port toward the workpiece. It has a paint injection port for

Further, the spray gun main body has a needle capable of opening and closing the paint injection port by advancing and retreating, and a needle operating means for advancing and retreating the needle.

Furthermore, the main body of the spray gun has an air supply path, and the tip of this air supply path is opened at an arbitrary point around the paint injection port, and by supplying air around the paint injection port, , the paint ejected from the paint injection port is atomized and the atomized paint is sprayed to the tip side in an arbitrary pattern.

On the other hand, the paint supply means integrated with the spray gun body has a casing, which has a paint discharge port communicating with the paint receiving port of the spray gun body.

A paint pouch is accommodated in the casing, and the paint pouch has a paint discharge port connected to the paint discharge part of the casing, and is in the form of a bag filled with paint. has been

In addition, the casing has a hydraulic fluid supply port connected to a hydraulic fluid supply joint of the hand unit. used to inject into

Furthermore, the casing has a hydraulic fluid discharge port connected to a hydraulic fluid discharge joint of the hand unit. It is used to return to the liquid supply means.

Furthermore, the casing is provided with an air supply port connected to the air supply joint of the hand unit for supplying air supplied from the air supply means to the air supply path of the spray gun main body.

In a state in which the paint pouch is filled with the paint, the hydraulic fluid is supplied into the casing through the hydraulic fluid supply port, thereby compressing the paint pouch and removing the paint in the paint pouch. The paint is discharged from the paint discharge part and supplied to the paint receiving port.

Furthermore, by releasing the connection between the hydraulic fluid supply joint and the hydraulic fluid supply port, the connection between the hydraulic fluid discharge joint and the hydraulic fluid discharge port, and the connection between the air supply joint and the air supply port, the hand unit can be removed. Hydraulic fluid supply joint and hydraulic fluid supply port, hydraulic fluid discharge joint and hydraulic fluid discharge port, and air supply joint and air By connecting the supply port, the spray gun can be attached to the coating machine via the hand unit.

Here, the hand unit includes a hand unit main body that is attached to the coating machine and capable of supporting the spray gun, and a movable part that is attached to the hand unit main body so as to move back and forth. Equipped with a joint, a hydraulic fluid discharge joint, and an air supply joint, and by moving the movable part forward and backward while supporting the spray gun on the hand unit body, the hydraulic fluid supply joint, the hydraulic fluid supply port, and the hydraulic fluid discharge joint It is preferable to enable connection or disconnection between the joint and the hydraulic fluid outlet, and between the air supply joint and the air supply port, thereby facilitating connection and disconnection between the hand unit and the spray gun.

In addition, the coating machine is provided with an arm that can move up and down, the hand unit is attached to this arm, and by raising the arm, the spray gun supported by the receiving part of the transfer unit is supported by the hand unit body. It may be possible to allow for exchange of spray guns above the painting area.

Further, the hydraulic fluid supply means has a hydraulic fluid tank in which hydraulic fluid to be supplied into the casing is stored, a distal end connected to a hydraulic fluid supply joint of the hand unit, and a base end arranged in the hydraulic fluid tank, A hydraulic fluid supply passage in which a feed valve is arranged at an arbitrary location, and a hydraulic fluid supplied from the hydraulic fluid supply passage arranged between the feed valve and the hydraulic fluid supply joint in the path of the hydraulic fluid supply passage. and a syringe pump for conveying to the hydraulic fluid supply port.

At this time, the syringe pump includes a syringe having a hydraulic fluid supply path connected to its tip, a piston inserted into the syringe so as to move back and forth, a piston rod connected to the proximal end of the syringe in the piston, and a syringe inside the syringe. It is preferable that the spray gun is provided with a hydraulic fluid conveying path for supplying hydraulic fluid to the spray gun.

The needle operating means for advancing and retracting the needle comprises a piston fixedly fitted with the needle and movably inserted in the head portion, a spring for biasing the piston toward the paint injection port, and an air pressure to the piston. It is preferable to provide an air supply means for pressing the needle to the side opposite to the paint injection port, thereby facilitating the operation of the needle.

An embodiment of the coating system of the present invention will be described with reference to the drawings. FIG. 1 is an external view showing an outline of the entire coating system of the present embodiment, in which 1 denotes the coating system of the present embodiment. .

The coating system 1 of this embodiment has a coating booth 2 for coating a work, and a coating device is arranged in the coating booth 2 . That is, in the figure, 3 is a coating device, and this coating device 3 has a coating robot as a coating machine and a spray gun attached to this coating robot, and the spray gun carries out coating via a hand unit. attached to the robot.

That is, in the figure, 4 is a painting robot, and this painting robot has a main body pillar 401 erected on a base 5, and a first arm 402 is rotatably connected to the main body pillar 401, A second arm 403 is rotatably connected to the first arm 402 . A long ball screw spline 404 is connected to the tip of the second arm 403 as an arm to which a spray gun is attached. width direction, that is, in the left-right direction.

In the figure, 6 is a work fixing table for fixing a jig to which a work is attached. In this embodiment, the workpiece fixing table 6 has a pair of fixing arms 601 capable of fixing the jig at both ends, and the pair of fixing arms 601 are rotatably connected to the base 5. The workpieces can be exchanged by rotating the connecting portion 602 . That is, while the work fixed to one of the fixing arms 601 is being coated, the jig to which the next work to be coated is attached is fixed to the other fixing arm 601. By rotating the connecting part 602 after finishing the coating of the work fixed to the fixing arm 601, the work fixed to the other fixing arm 601 can be moved to the coating area and can be immediately coated.

Next, in the figure, 11 is a spray gun. In this embodiment, the spray gun 11 is detachably attached to both ends of the ball screw spline 404 via a hand unit.

2 and 3 are perspective views showing the spray gun 11 in this embodiment, and FIG. 4 is a schematic diagram showing the outline of the structure of the spray gun 11 in this embodiment. It is a partial cross-sectional view, and in this embodiment, the spray gun 11 has a spray gun body and paint supply means for supplying paint to the spray gun body. 2 and 3, 12 is the spray gun body and 13 is the coating material supply means. In this embodiment, the spray gun body 12 and the coating material supply means 13 are integrated.

First, the spray gun main body 12 will be described. FIG. 5 is a cross-sectional view for explaining the structure of the spray gun main body 12. In this embodiment, the spray gun main body 12 has a paint supply passage formed therein. , the paint supplied from the paint supply means 13 can be received and the received paint can be jetted.

That is, in the figure, 14 is a paint supply passage, and this paint supply passage 14 comprises a paint receiving port 14a for receiving the paint supplied from the paint supplying means 13, and a paint receiving port 14a for directing the paint received from the paint receiving port 14a to the workpiece. The paint receiving port 14a is opened on the side wall side of the spray gun body 12, and the paint injection port 14b is opened on the tip surface of the spray gun body 12. ing.

Next, in FIG. 5, reference numeral 15 denotes a needle for opening and closing the paint injection port 14b. The needle 15 is movable in the longitudinal direction of the spray gun main body 12 by needle operating means, and moves forward. , the paint injection port 14b is closed, and the paint injection port 14b is opened by retreating.

Here, the needle operating means will be described. In this embodiment, the coating material supply path 14 extends from the coating material injection port 14b to the rear side of the spray gun body 12 by an arbitrary distance, and then extends from the side wall of the spray gun body 12. In the side wall of the spray gun main body 12, the paint receiving opening 14a is opened.

On the other hand, the needle 15 is arranged inside the spray gun main body 12 so as to pass through the central portion of the spray gun main body 12, the tip side is located in the paint supply passage 14, and the base end side is located in the spray gun main body. Inside 12, a piston 16 is fixed inside the spray gun main body 12 so as to be freely movable in the forward and rearward directions and protrude from the paint supply passage 14 outside the paint supply passage 14. As shown in FIG. The piston 16 is urged toward the tip of the spray gun body 12 by a spring 17, so that the needle 15 normally moves along with the piston 16 toward the tip of the spray gun body 12, and the tip of the needle 15 sprays paint. The mouth 14b is closed.

Next, inside the spray gun main body 12, an air chamber 18 is formed on the side opposite to the spring of the piston 16, and the base end side is opened at the side wall of the spray gun main body 12, and the tip side is the air chamber 18. A connected needle operating air supply path 19 is formed. An air conveying path for needle operation formed in the coating material supply means 13 is connected to the base end side opening of the needle operating air supply path 19, and air is supplied from the coating material supply means 13. Air is supplied into the air chamber 18 through the needle operating air supply passage 19, and the piston 16 is pushed toward the base end side in the spray gun main body 12. The tip of the needle 15 is moved to the base end side, and the closing of the paint injection port 14b by the tip of the needle 15 is released. Therefore, in this embodiment, by supplying air to the air chamber 18 or removing the supplied air, the needle 15 can be operated to open and close the paint injection port 14b. However, in the present invention, it is not always necessary to operate the needle 15 in the configuration described above, and any configuration may be used as long as the paint injection port 14b can be opened and closed by moving the needle 15 in the front-rear direction of the spray gun main body 12. may be

Next, in the figure, 20 is an atomizing air supply passage. That is, in this embodiment, the spray gun main body 12 is formed with an atomizing air supply passage 20 for atomizing the paint discharged from the paint injection port 14b and spraying it toward the work. The tip of the atomizing air supply path 20 is opened at an arbitrary location around the paint injection port 14b, and the base end of the atomizing air supply path 20 is formed in the paint supply means 13. are connected, and air is supplied through the atomizing air conveying path formed in the paint supply means 13, the atomizing air is supplied around the paint injection port 14b through the atomizing air supply path 20, and the paint It is possible to atomize the paint discharged from the injection port 14b.

Next, in the figure, 21 is a pattern air supply path. That is, in this embodiment, the spray gun main body 12 is formed with a pattern air supply path 21 for changing the ejection pattern of the paint atomized by the atomizing air to an arbitrary pattern. The pattern air supply path 21 has an opening 2101 outside the opening of the tip of the atomizing air supply path 20 at the tip, and is formed in the paint supply means 13 at the base. When the pattern air conveying path is connected and air is supplied through the pattern air conveying path formed in the coating material supply means 13, the leading end opening of the atomizing air supply path 20 passes through the pattern air supplying path 21. Pattern air is supplied around the , making it possible to change the ejection pattern of the paint atomized by the atomizing air.

Next, the paint supply means 13 constituting the spray gun 11 together with the spray gun main body 12 will be described. It is composed of a manifold 23 for supplying paint filled inside 22 to the spray gun main body 12 .

Here, referring to FIG. 4, the main body portion 22 of the paint supply means 13 will be described.

A paint discharge portion 26 is formed at the lower end portion of the casing 24 . Further, the casing 24 has its inside sealed, and has a hydraulic fluid supply portion 27 for supplying the hydraulic fluid to the inside of the casing 24, and a hydraulic fluid supply portion 27 for discharging the hydraulic fluid supplied from the casing 24. A hydraulic fluid discharge portion 28 (see FIG. 7) is formed.

On the other hand, the paint pouch 25 has a bag-like shape, can be filled with paint, and has a paint discharge port 30 connected to a paint discharge part 26 formed in the casing 24 .

Here, the paint pouch 25 will be described. The paint pouch 25 of this embodiment is composed of a multi-layer film, and shrinks when the paint filled inside is discharged. It is supposed to expand by filling.

6 and 7 are perspective views showing the spray gun 11 with the casing 24 around the paint pouch 25 removed to expose the paint pouch 25. In the figures, 29 is inside the casing 24. A hydraulic fluid discharge pipe for discharging the supplied hydraulic fluid from the casing 24. The hydraulic fluid discharge pipe 29 has a lower end connected to the hydraulic fluid discharge portion 28 and an upper end opened at the upper end portion in the casing 24. there is

Next, the manifold 23 will be described. In this embodiment, the manifold 23 has the main body portion 22 connected to its upper portion and the spray gun main body 12 connected to its lower portion. A paint conveying path (not shown) is formed inside, and one end of this paint conveying path is connected to the paint discharge portion 26 formed in the casing 24, and the other end is connected to the paint formed in the spray gun main body 12. It is connected to the supply path 14 so that the paint in the paint pouch 25 can be supplied to the spray gun main body 12 .

A hydraulic fluid supply port 31 and a hydraulic fluid discharge port 32 are formed on the side surface of the manifold 23, and the hydraulic fluid supply port 31 communicates with a hydraulic fluid supply portion 27 formed in the casing 24. The outlet 32 communicates with a hydraulic fluid outlet 28 formed in the casing 24 .

With this configuration, when the paint pouch 25 is filled with paint, the hydraulic fluid cannot be discharged from the hydraulic fluid discharge portion 28, and the hydraulic fluid is discharged from the hydraulic fluid supply portion 27 through the hydraulic fluid supply port 31. As the hydraulic fluid is supplied into the casing 24, the paint pouch 25 is pressed by the hydraulic fluid. As a result, the paint pouch 25 is compressed by the hydraulic fluid and shrinks, and the paint in the paint pouch 25 is discharged from the paint discharge port 30 to the paint discharge portion 26 of the casing 24, and further along the paint conveying path. supplied to the spray gun main body 12 through the

On the other hand, when the hydraulic fluid is supplied from the hydraulic fluid supply portion 27 into the casing 24 in a state where the hydraulic fluid can be discharged from the hydraulic fluid discharge portion 29, after the inside of the casing 24 is filled with the hydraulic fluid, , the hydraulic fluid supplied into the casing 24 is discharged to the outside of the casing 24 through a paint discharge pipe 29, a hydraulic fluid discharge portion 28 and a hydraulic fluid discharge port 32 which are open at the upper end of the casing 24. As shown in FIG. As a result, the hydraulic fluid in the casing 24 can be discharged, and since the upper end of the hydraulic fluid discharge pipe is open at the upper end portion in the casing 24, the hydraulic fluid in the casing 24 can be discharged in the process of discharging the hydraulic fluid. It becomes possible to easily perform air bleeding and the like.

Further, three air supply ports 33 are formed on the side surface of the manifold 23, and these air supply ports 33 are respectively formed in the manifold 23 for operating the needles and the atomizing air transport path. , pattern air transport paths (none of which are shown), and as described above, these air transport paths for needle operation, atomization air transport paths, and pattern air transport paths are connected to the spray gun body 12 respectively. It communicates with the needle operating air supply path 19, the atomization air supply path 20, and the pattern air supply path 21 which are formed in .

Therefore, by injecting air from each of the air supply ports 33, air is supplied to the needle operating air supply path 19, the atomization air supply path 20, and the pattern air supply path 21 formed in the spray gun body 12. As a result, the needle 15 is operated to open the paint injection port 14b, and the paint supplied to the paint supply path 14 can be atomized in an arbitrary pattern and injected from the paint injection port 14b. be.

Next, the hand unit for attaching the spray gun 11 to the coating robot 4 will be described. In FIG. 1, 34 is the hand unit. , so that the spray gun 11 can be attached to both ends of the ball screw spline 404 of the coating robot 4 .

8 and 9 are perspective views showing the hand unit 34 of this embodiment, FIG. 8 is a top view, and FIG. 9 is a bottom view. It is a diagram. The hand unit 34 has a hand unit main body, and this hand unit main body is attached to the ball screw spline 404 of the coating robot 4 .

That is, in the figure, reference numeral 35 denotes a hand unit main body, and this hand unit main body 35 is box-shaped with an open top and has a movable portion 36 inside. The movable portion 36 is movable back and forth by an air cylinder 37 . In the figure, reference numeral 38 denotes an air supply pipe for supplying air to the air cylinder 37. As shown in FIG.

Next, in the figure, 39 is a hydraulic fluid supply joint, and 40 is a hydraulic fluid discharge joint. That is, the movable portion 36 is provided with a hydraulic fluid supply joint 39 and a hydraulic fluid discharge joint 40 . The hydraulic fluid supply joint 39 and the hydraulic fluid discharge joint 40 are connected to the hydraulic fluid supply means at their proximal ends, and the hydraulic fluid supply port 31 formed in the manifold 23 and the hydraulic fluid discharge joint 40 at their distal ends. It is connectable to the liquid discharge port 32 . Therefore, in the present embodiment, by connecting the hydraulic fluid supply joint 39 and the hydraulic fluid discharge joint 40 to the hydraulic fluid supply port 31 and the hydraulic fluid discharge port 32 of the manifold 23, respectively, the hydraulic fluid can flow into the casing 24. It is possible to supply and drain the hydraulic fluid in the casing 24 . In the figure, 45 and 46 are part of the hydraulic fluid supply means, 45 is a hydraulic fluid supply path, and 46 is a hydraulic fluid discharge path.

Next, in the figure, 41 is an air supply joint. That is, the movable portion 36 further has an air supply joint 41 to which the three air supply ports 33 formed on the side surface of the manifold 23 are connected. An air supply means is connected to the side. Therefore, in this embodiment, by connecting an air supply joint 41 to each of the three air supply ports 33 of the manifold 23, the needle operating air supply path 19 formed in the spray gun main body 12 and the atomization air supply Air can be supplied to the path 20 and the pattern air supply path 21 . 9, reference numeral 62 denotes a part of the air supply means, which is an air pipe for supplying air to the air supply joint 41. As shown in FIG.

Thus, in this embodiment, the hand unit 34 is provided with the hydraulic fluid supply joint 39 and the hydraulic fluid discharge joint 40 to which the hydraulic fluid supply means are connected, and the air supply joint 41 to which the air supply means is connected. Hydraulic fluid supply means or air supply means can be connected to the spray gun by simply attaching the spray gun 11 to the hand unit 34, and the hydraulic fluid can be supplied by simply removing the spray gun 11 from the hand unit 34. Since the connection between the supply means and air supply means and the spray gun can be released, when changing the paint color, the hydraulic fluid supply means and air supply means can be disconnected from the spray gun like a conventional pouch gun. There is no need to do it, and the work has become easier.

Next, in the figure, 42 is an engaging claw portion for supporting the spray gun 11 on the hand unit main body 35. As shown in FIG. That is, the hand unit main body 35 is formed with an engaging claw portion 42, while the paint supply means 13 of the spray gun 11 has a groove (not shown) in which the engaging claw portion 42 is engaged. is formed, and by locking the locking claw portion 42 in the groove, it is possible to support the spray gun 11 on the hand unit main body 35 .

In this embodiment, in a state in which the spray gun 11 is supported by the hand unit main body 35, by advancing the movable portion 36, the hydraulic fluid supply joint 39 and the hydraulic fluid supply port 31 are connected, and the hydraulic fluid is supplied. The connection between the discharge joint 40 and the hydraulic fluid discharge port 32 and the connection between the three air supply joints 41 and the three air supply ports 33 are performed, whereby the spray gun 11 is attached to the hand unit 34. make it possible to On the other hand, with the spray gun 11 attached to the hand unit 34, the movable portion 38 is retracted to connect the hydraulic fluid supply joint 39 and the hydraulic fluid supply port 31, and to connect the hydraulic fluid discharge joint 40 and the hydraulic fluid. The connection with the discharge port 32 and the connection between the three air supply joints 41 and the three air supply ports 33 are released, making it possible to remove the spray gun 11 from the hand unit 34 .

Hydraulic fluid supply means connected to the base ends of the hydraulic fluid supply joint 39 and the hydraulic fluid discharge joint 40 will now be described. FIG. 10 is a block diagram for explaining the hydraulic fluid supply system in this embodiment. In the figure, reference numeral 43 denotes hydraulic fluid supply means, and in this embodiment, the hydraulic fluid supply means 43 comprises a hydraulic fluid tank 44 in which hydraulic fluid such as water to be supplied to the hand unit 34 is stored, and a hydraulic fluid tank 44. It has a hydraulic fluid supply path 45 for supplying the hydraulic fluid in the hydraulic fluid tank 44 to the hand unit 34 and a hydraulic fluid discharge path 46 for returning the hydraulic fluid supplied in the casing 24 to the hydraulic fluid tank 44 . .

The hydraulic fluid supply path 45 is connected at its distal end to the proximal end of the hydraulic fluid supply joint 39 in the hand unit 34 and disposed in the hydraulic fluid tank 44 at its proximal end. Further, a feed valve 47 is arranged in the path of the hydraulic fluid supply path 45 . An actuating pump 48 is provided which is used to draw hydraulic fluid therein.

Next, in the figure, 49 is a syringe pump for supplying hydraulic fluid to the hand unit 34 . That is, in this embodiment, a syringe pump 49 is interposed between the feed valve 47 and the hydraulic fluid supply joint 39 in the path of the hydraulic fluid supply path 45, and the hydraulic fluid is supplied to the hand unit by the syringe pump 49. 34 will be supplied.

Here, the syringe pump 49 will be described. In this embodiment, the syringe pump 49 has a cylindrical syringe 49a. A hydraulic fluid supply path 45 is connected to the distal end of the syringe 49 a , and the hydraulic fluid supply path 45 communicates the syringe 49 a with the hydraulic fluid supply joint 39 .

A piston 49b is inserted into the syringe 49a so as to be movable forward and backward, and a piston rod 49c is connected to the proximal end of the syringe 49a in the piston 49b. A hydraulic fluid conveying path (not shown) is formed in the piston rod 49c in the axial direction. ) is formed, which allows the hydraulic fluid to pass through the hydraulic fluid conveying path, the syringe 49a, and the syringe pump 49. As shown in FIG.

Next, in the figure, the hydraulic fluid discharge path 46 is connected to the hydraulic fluid discharge joint 40 in the hand unit 34 on the distal end side and arranged in the hydraulic fluid tank 44 on the proximal end side. A return valve 50 is provided and is used to return the hydraulic fluid supplied into the casing 24 to the hydraulic fluid tank 44 in order to remove air from the casing 24 or the like.

The operation of the hydraulic fluid supply means 43 configured in this manner will be described. The paint pouch 25 is filled with paint, and the hydraulic fluid supply path 45 and the syringe are operated by operating the pump 48 for operation. When the pump 49 is filled with working fluid, the working pump 48 is stopped, the feed valve 47 is closed, and the working fluid cannot be discharged from the working fluid discharge portion 28 formed in the casing 24. to move the piston 49b of the syringe pump 49 forward. Then, the hydraulic fluid in the syringe pump 49 is pushed toward the distal end side of the syringe pump 49 by the piston 49b, thereby being pushed out of the syringe pump 49, whereby the pushed hydraulic fluid is supplied to the hydraulic fluid supply joint 39 and the hydraulic fluid supply joint 39. The hydraulic fluid is supplied into the casing 24 through the hydraulic fluid supply port 31, and the paint pouch 25 is pressed. is jetted toward the work from

In FIG. 10, the operating pump 48 is operated to fill the hydraulic fluid supply path 45 and the syringe pump 49 with the operating fluid, but the operating pump 48 is not necessarily required. The hydraulic fluid in the hydraulic fluid tank 44 may be sucked into the syringe 49a by retracting the piston 49b while the tip side of the syringe 49a is closed and creating a negative pressure in the syringe pump 4a.

In addition, although the method of moving the piston 49b is not particularly limited, a movable plate is connected to the piston rod 49c, a screw is screwed to the movable plate, and the screw is connected to a motor, as in the case of the conventional syringe gun described above. Then, by rotating the motor forward or backward, the movable plate is advanced or retreated along the screw thread, and the piston 51b is advanced or retreated via the piston rod 49c.

Next, the case of returning the hydraulic fluid will be described. In a state where the hydraulic fluid is filled in the casing 24, the hydraulic fluid supply path 45 and the syringe pump 49, the return valve 50 is opened and the casing 24 is returned. In a state in which the hydraulic fluid can be discharged from the formed hydraulic fluid discharge portion 28, the actuating pump 48 is operated or the piston 49b of the syringe pump 49 is advanced. Then, the hydraulic fluid in the casing 24 can be returned to the hydraulic fluid tank 44 through the hydraulic fluid discharge passage 46 while passing through the return valve 50, and the air in the casing 24 can be removed. However, the hydraulic fluid discharge path 46 is not necessarily required in the present invention, and the construction may be such that the hydraulic fluid discharge path 46 and the return valve 50 are not provided.

As described above, in the syringe gun system of the present embodiment, the syringe pump 49 is used to supply the working fluid, so it is possible to supply a fixed amount of the working fluid into the casing 24. A fixed amount of paint in the pouch 25 can be discharged. Further, by enabling the hydraulic fluid in the casing 24 to be discharged, it is possible to prevent air from accumulating in the casing 24 . Although the hydraulic fluid is not particularly limited, water was used as the hydraulic fluid in this embodiment.

Next, in FIG. 1, 51 is a transfer unit. That is, the coating system of this embodiment has a transfer unit 51 for providing unused spray guns to the coating apparatus and for collecting used spray guns.

In this embodiment, the transfer unit 51 is provided on the upper side of the painting booth 2, and includes a waiting area 52 for waiting unused spray guns, and a waiting area 52 for collecting used spray guns and As shown in FIG. 1, the standby area 52 is arranged above the painting booth 2, and the replenishment collection area 53 is located outside the painting booth 2. are placed in

Further, the transfer unit 51 is provided with transfer rails 54 extending between the standby area 52 and the replenishment recovery area 53, and the transfer rails 54 are movable along the transfer rails 54. A receiver 55 is attached.

Further, the receiving portion 55 has a receiving portion main body 56 connected to the transfer rail 54 and a support portion 57 mounted on the receiving portion main body 56 so as to be vertically movable. It has a support arm 58 for mounting the gun 11 thereon. In this embodiment, as shown in FIG. 11, the spray gun 11 is supported by the support arm 58 by placing the upper portion of the manifold 23 of the spray gun 11 on the support arm 58 .

The method of moving the receiving portion 55 is not particularly limited, but it may be moved using a belt, a chain, or the like, or the receiving portion 55 may be provided with a motor so that the receiving portion 55 can run by itself. The method of attaching the support portion 57 to the receiving portion main body 56 so as to be vertically movable is not particularly limited. may

Here, FIG. 11 is a diagram for explaining the support portion 57, and shows a state in which part of the receiving portion 55 is viewed from below. The receiving portion 55 has a bottom plate 59 having a passage hole 60 and a lid portion 61 for opening and closing the passage hole 60 .

By lowering the support portion 57, the cover 61 is opened and the support arm 58 is moved into the coating booth 2. On the other hand, the support portion 57 is raised while the support arm 58 is in the coating booth 2. Then, the support arm 58 returns into the transfer unit 51 and the lid 61 is closed.

Next, the action of the transfer unit 51 will be described. Place. That is, by supporting the upper portion of the manifold 23 with the support arm 58 , the spray gun is placed on the support arm 58 of the receiving portion 57 .

After that, the receiver 55 is moved to a predetermined position in the waiting area 52 along the transfer rail 54 , and then the support arm 58 is lowered to move the spray gun 11 into the coating booth 2 .

Next, the first arm 402 and the second arm 403 of the coating robot 4 are rotated upward with respect to the body pillar 401 to raise the ball screw spline 404, and the ball screw spline 404 is moved in the left-right direction as appropriate, The engaging claw portion 42 of the hand unit main body 35 is engaged with the groove formed in the paint supply means 13 of the spray gun 11 , thereby supporting the spray gun 11 on the hand unit main body 35 .

Then, with the spray gun 11 supported by the hand unit main body 35, the movable portion 36 of the hand unit 34 is advanced. Then, as described above, the connection between the hydraulic fluid supply joint 39 and the hydraulic fluid supply port 31, the connection between the hydraulic fluid discharge joint 40 and the hydraulic fluid discharge port 32, and the three air supply joints 41 and Connection with the three air supply ports 33 is performed, whereby the spray gun 11 can be attached to the hand unit 34 .

Next, in this state, the position of the ball screw spline 404 is adjusted by rotating the first arm 402 and the second arm 403, the spray gun 11 is removed from the support 58, and then the ball screw spline 404 is lowered. , to move the spray gun 11 to the coating area.

On the other hand, when removing the used spray gun 11 from the hand unit 34 and recovering it, the first arm 402 and the second arm 403 of the coating robot 4 are moved while the spray gun 11 is attached to the hand unit 34 . is rotated to raise the ball screw spline 404 and mount the spray gun 11 on the support arm 58 .

Then, the movable part 36 is retracted, the connection between the hydraulic fluid supply joint 39 and the hydraulic fluid supply port 31 is released, the connection between the hydraulic fluid discharge joint 40 and the hydraulic fluid discharge port 32 is released, and the three air supply The connection between the air supply joint 41 and the three air supply ports 33 is released, and the spray gun 11 is removed from the hand unit 34 .

Then, after moving the ball screw spline 404 away from the support portion 57 , the support arm 58 is raised to move the spray gun 11 into the standby area 52 . Further, the receiver 55 is moved into the replenishment collection area 53 along the transfer rail 54 , and the used spray gun 11 is removed from the receiver 55 in the replenishment collection area 53 . After that, replenishment of unused spray guns and collection of used spray guns are repeated, and the paint color is changed.

Thus, in the coating system of this embodiment, the transfer unit 51 is provided above the coating booth. By advancing the movable portion 36 of the hand unit 34 with , the spray gun 11 can be attached to the hand unit 34 .

Also, by raising the ball screw spline 404 of the coating apparatus, placing the spray gun locked to the hand unit 34 on the support arm 54, and retracting the movable part 38 in this state, the hydraulic fluid supply joint 39 is and the hydraulic fluid supply port 31, disconnection of the hydraulic fluid discharge joint 40 and the hydraulic fluid discharge port 32, and connection between the three air supply joints 41 and the three air supply ports 33 It is possible to release the connection and remove the spray gun 11 from the hand unit 34 . Therefore, replacement of the spray gun has become extremely easy.

Furthermore, in the coating system of this embodiment, a transfer unit 51 for providing unused spray guns and collecting used spray guns is provided above the coating booth, and the unused spray guns are kept on standby. This also made it very easy to replace the spray gun, since it was ready for replacement with a used spray gun.

As described above, in the coating system of this embodiment, in a coating system using a spray gun in which the spray gun body is integrated with the coating material supplying means equipped with the coating pouch, the hydraulic fluid can be supplied only by removing the spray gun from the hand unit. The connection between the means or the air supply means and the spray gun can be released, and the moving part of the hand unit can be moved back and forth while the spray gun is placed on the transfer unit by raising the ball screw spline of the coating device. Since the spray gun can be attached/detached to/from the hand unit with just a screwdriver, replacement of the spray gun is easy, and painting of a large number of workpieces and color change of paint can be efficiently performed.

INDUSTRIAL APPLICABILITY The coating system of the present invention is applicable to all coating systems using spray guns integrally provided with coating material supply means.

1 painting system 2 painting booth 3 painting equipment 4 painting machine (painting robot)
401 main body pillar 402 first arm 403 second arm 404 ball screw spline 5 base 6 work fixing table 601 fixing arm 602 connecting portion 11 spray gun 12 spray gun main body 13 paint supply means 14 paint supply passage 14a paint receiving port 14b paint Injection port 15 Needle 16 Piston 17 Spring 18 Air chamber 19 Needle operating air supply path 20 Atomizing air supply path 21 Pattern air supply path 22 Main body 23 Manifold 24 Casing 25 Paint pouch 26 Paint discharge part 27 Hydraulic fluid supply part 28 Operation Liquid discharge part 29 Hydraulic fluid discharge pipe 30 Paint discharge port 31 Hydraulic fluid supply port 32 Hydraulic fluid discharge port 33 Air supply port 34 Hand unit 35 Hand unit body 36 Movable part 37 Air cylinder 38 Air supply pipe 39 Hydraulic fluid supply joint 40 Hydraulic fluid discharge joint 41 Air supply joint 42 Locking claw 43 Hydraulic fluid supply means 44 Hydraulic fluid tank 45 Hydraulic fluid supply path 46 Hydraulic fluid discharge path 47 Feed valve 48 Actuating pump 49 Syringe pump 49a Syringe 49b Piston 49c Piston rod 50 Return valve 51 Transfer unit 52 Standby area 53 Replenishment recovery area 54 Transfer rail 55 Receiving part 56 Receiving part body 57 Support part 58 Support arm 59 Bottom plate 60 Passing hole 61 Lid part 62 Air supply means (air pipe)

Claims (6)

A coating machine (4), a hand unit (34) attached to the coating machine (4), and a spray gun (11) detachably attached to the coating machine (4) via the hand unit (34). A coating device (3) for coating a workpiece to be coated, comprising
a transfer unit (51) for providing unused spray guns (11) to a coating apparatus (3) and collecting used spray guns (11),
The transfer unit (51)
a transport rail (54);
a receiver (55) capable of supporting the spray gun (11) and movable along the transfer rail;
The hand unit (34)
a hydraulic fluid supply joint (39) and a hydraulic fluid discharge joint (40) to which the hydraulic fluid supply means (43) is connected;
an air supply joint (41) to which an air supply means is connected,
The spray gun (11) is
A spray gun body (12) and paint supply means (13) for supplying paint to the spray gun body (12) are integrally provided,
The spray gun body (12) includes a paint receiving port (14a) for receiving the paint supplied from the paint supply means (13), and a spray gun for spraying the paint received from the paint receiving port (14a) toward the workpiece. a paint supply passage (14) having a paint injection port (14b);
a needle (15) capable of opening and closing the paint injection port (14b) by advancing and retreating;
a needle operating means for advancing and retracting the needle (15);
The tip is opened at an arbitrary position around the paint injection port (14b), and by supplying air around the paint injection port (14b), the paint discharged from the paint injection port (14b) is misted. an air supply path (20, 21) for spraying the atomized paint to the tip side in an arbitrary pattern,
The paint supply means (13) is
a casing (24) having a paint outlet (26) communicating with the paint receiving port (14a);
A bag-like paint pouch (25) which is housed in the casing (24), has a paint discharge port (30) connected to the paint discharge part (26), and is filled with paint. and
The casing (24) is
a hydraulic fluid supply port (31) connected to the hydraulic fluid supply joint (39) for injecting the hydraulic fluid supplied from the hydraulic fluid supply means (43) into the casing (24);
a hydraulic fluid discharge port (32) connected to the hydraulic fluid discharge joint ( 40 ) for returning the hydraulic fluid injected into the casing (24) to the hydraulic fluid supply means (43);
an air supply port (33) connected to the air supply joint (41) for supplying air supplied from the air supply means to the air supply paths (20, 21) of the spray gun body (12); Equipped with
By supplying the working fluid into the casing (26) through the working fluid supply port (31), the paint pouch (25) is pressed and the paint in the paint pouch (25) is discharged from the paint discharge section. (26) to be discharged and supplied to the paint receiving port (14a),
Connection between the hydraulic fluid supply joint (39) and the hydraulic fluid supply port (31), connection between the hydraulic fluid discharge joint (40) and the hydraulic fluid discharge port (32), and connection of the air supply joint (41) and the air By disconnecting the connection of the supply port (33), it is possible to remove the spray gun (11) attached to the coating machine (4),
The hydraulic fluid supply joint (39) and the hydraulic fluid supply port (31), the hydraulic fluid discharge joint (40) and the hydraulic fluid discharge port (32), and the air supply joint (41) and the air supply port (33) ), a spray gun (11) can be attached to the coating machine (4). The hand unit (34)
A hand unit body (35) mounted on a coating machine (4) and capable of supporting a spray gun (11); with
The movable part (36) is provided with the hydraulic fluid supply joint (39), the hydraulic fluid discharge joint (40) and the air supply joint (41),
With the spray gun (11) supported by the hand unit main body (35), the movable part (36) is advanced and retracted to connect the hydraulic fluid supply joint (39), the hydraulic fluid supply port (31), and the hydraulic fluid discharge joint (39). (40) and the hydraulic fluid discharge port (32), and between the air supply joint (41) and the air supply port (33) can be connected or disconnected. system. The coating machine (4) has a vertically movable ball screw spline (404), and the hand unit (34) is attached to the ball screw spline (404),
By raising the ball screw spline (404), the spray gun (11) supported by the receiving part (52) of the transfer unit (51) can be supported by the hand unit main body (35). 3. A coating system according to claim 2. The hydraulic fluid supply means (43) is
a hydraulic fluid tank (44) storing hydraulic fluid to be supplied into the casing (24);
A hydraulic fluid supply passage (45) having a distal end connected to the hydraulic fluid supply joint (39), a base end disposed in a hydraulic fluid tank (44), and a feed valve (47) disposed at an arbitrary location. When,
Hydraulic fluid supplied from the hydraulic fluid supply path (45) arranged between the feed valve (47) and the hydraulic fluid supply joint (39) in the path of the hydraulic fluid supply path (45) is supplied to the hydraulic fluid supply path (45). 4. The coating system according to any one of claims 1 to 3, further comprising a syringe pump (49) for conveying the liquid to the liquid supply port (31). The syringe pump (49) includes a syringe (49a) having a distal end connected to the hydraulic fluid supply path (45);
a piston (49b) inserted into the syringe (49a) so as to move back and forth;
a piston rod (49c) connected to the proximal end of the syringe (49a) in the piston (49b);
5. The coating system according to claim 4, further comprising a hydraulic fluid conveying path for supplying hydraulic fluid into the syringe (49a). The needle operating means includes a piston (16) to which the needle (15) is fixed and which is movably inserted in the spray gun main body (12), and the piston (16) is connected to a paint injection port (14b). and an air supply means (19) for pressing the piston (16) with air pressure to the side opposite to the paint injection port (14b). The coating system according to any one of claims 1 to 5.

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