JPH0642765Y2 - Paint gun cleaning equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a coating gun cleaning device.

(Prior Art) Conventionally, as this type of device, a cleaning case is provided in a coating booth, a cleaning nozzle is provided in the cleaning case, and an insertion port for inserting a coating gun into the upper wall of the case and a case of the case. A discharge port is formed at the bottom, a coating gun is inserted into the case, and a coating liquid is sprayed with a cleaning liquid such as thinner to clean the coating gun. This is known from JP-A-59-127671. In this case, the inside of the cleaning case is exhausted by utilizing the downward airflow in the coating booth.

(Problems to be solved by the invention) In the above-mentioned conventional one, since the air flow in the coating booth is not so fast, the mist in the cleaning case may be scattered from the insertion port to the upper part of the coating booth and may contaminate the inside of the coating booth. is there.

In this case, it is conceivable to increase the speed of the air flow in the coating booth so that the cleaning case can be sufficiently exhausted. However, increasing the flow velocity of the air flow in the coating booth may lower the coating efficiency. Also, a large blower is required and the equipment cost increases.

Further, an elastic cover member as in Japanese Utility Model Laid-Open No. 63-77664 is provided at the insertion port of the cleaning case so that when the coating gun is inserted, the cover member abuts on the outer periphery to prevent a gap. It is conceivable that dirty cleaning liquid or dirt attached to the inner surface of the cover member may adhere to the coating gun when the coating gun is pulled out after cleaning.

In addition, when cleaning the coating gun, the cleaning liquid is sprayed from the cleaning nozzle to clean the coating gun, the coating gun is dried, and then the coating gun is pulled out of the cleaning case. Since there is a difference in height between the pipes for supplying the cleaning liquid, even if the valve provided in the middle of the pipe is closed, the cleaning liquid in the downstream pipe flows out from the cleaning nozzle, and it takes time to dry the coating gun. Furthermore, the cleaning liquid is wasted.

In view of the above points, the present invention prevents the mist in the cleaning case from scattering into the coating booth, and improves the disconnection of the cleaning liquid after stopping the supply of the cleaning liquid to delay the drying of the coating gun and the cleaning liquid. It is an object of the present invention to provide a cleaning device that does not cause waste.

(Means for Solving the Problem) In order to achieve the above-mentioned object, the invention of claim 1 is to paint in a cleaning case provided with a cleaning nozzle and an insertion port into which a coating gun can be inserted with a gap in the periphery. In a cleaning device for inserting a gun and cleaning it, an exhaust port is provided in a wall portion of the cleaning case facing the nozzle at the tip of the coating gun, and an exhaust device for forcibly exhausting the inside of the cleaning case is provided in the exhaust port. A check valve that opens at a predetermined pressure or higher is provided at a position near the cleaning nozzle in a cleaning liquid supply pipe connected to the cleaning nozzle. In this case, as in the invention of claim 2, it is preferable that a gas-liquid separation device in which a baffle plate is disposed so that a meandering flow path is formed in the separation case is connected to the discharge port by piping. According to the invention of claim 3, it is preferable that the baffle plate is formed of a corrugated plate.

(Function) Since the cleaning case is smaller than that of the painting booth, a sufficiently fast air flow can be obtained even with a small exhaust device.
Therefore, it is possible to prevent the mist in the cleaning case from scattering outward.

When cleaning the coating gun, the paint remaining in the coating gun is discharged.However, since the exhaust port is installed to face the nozzle at the tip of the coating gun, the coated particles are quickly discharged from the discharge port. The inside of the cleaning case due to can be prevented.

Further, a check valve is provided in the vicinity of the nozzle connected to the cleaning nozzle, and after closing the valve provided in the middle of the pipe, the pipe on the downstream side of the valve due to the height difference and residual pressure of the pipe. Even if the cleaning liquid in the inside tries to flow out from the cleaning nozzle, the outflow is blocked by the check valve, and the cleaning liquid runs out easily after the supply of the cleaning liquid is stopped. The check valve is set to open at a predetermined pressure higher than the difference in height of pipes or residual pressure and lower than the supply pressure of the cleaning liquid.

Further, if the exhaust air from the outlet of the cleaning case is discharged into the coating booth, the inside of the coating booth will be contaminated with the cleaning liquid containing the paint.

In this case, as in the second aspect of the invention, if a gas-liquid separation device, in which a baffle plate is arranged so that a meandering flow path is formed in the separation case, is connected to the outlet by piping, Exhaust gas introduced into the machine hits the baffle plate to effectively separate gas and liquid. Even if the exhaust device actively exhausts gas from the exhaust port, only the gas and liquid separated gas is exhausted in the coating booth. As a result, the above problems can be resolved.

Further, by forming the baffle plate with a corrugated plate, the length of the flow path is substantially lengthened, and gas-liquid separation is more effectively performed.

(Example) With reference to FIGS. 1 to 7, (1) shows a cleaning case, and the cleaning case (1) is a stay (2a) extending from a frame (2) arranged in a coating booth. The cleaning case is provided with an insertion opening (3) for inserting a painting gun on the upper wall of the cleaning case (1) and an outlet (4) on the bottom wall of the case (1). The cleaning nozzle (5) and the air nozzle (6) are alternately arranged on the outer periphery of the upper side of (1) with their tips facing the inside of the case (1) and spaced apart from each other. 1) A gas-liquid mixing type cleaning nozzle (7) is provided on the outer periphery of the lower side of the coating gun, which is directed toward the tip of the coating gun.
The I-type painting gun A attached to the painting robot was inserted into the washing case (1) from above so as to be washed.

The exhaust port (4) is provided with an exhaust device (8) for forcibly exhausting the inside of the cleaning case (1).
A gas-liquid separation device (9) for introducing exhaust gas from was provided.

More specifically, as shown in FIG. 5, the cleaning nozzle (5) has a nozzle body (5a) having a jet port (5b) and a large diameter hole (5c) communicating with the jet port (5b). The orifice member (5d) is inserted into the large diameter hole (5c), and the passage forming member (5e) is screwed into the nozzle body (5a) so as to be closely attached to the tail end of the orifice member (5d). The orifice member (5d) is provided with a small hole (5f) in the radial direction, and the nozzle body (5a) is provided with a port (5g) connected to the large hole (5c). A gas-liquid mixture in which a pipe for supplying air to 5e) and a pipe for supplying a cleaning liquid such as thinner are connected to the port (5g) and thus each cleaning nozzle (5) mixes and injects the cleaning liquid and air. Configured into molds.

Further, the port (5g) and the passage forming member (5e) are respectively provided with check valves (10) clearly shown in FIG. 6, and a cleaning nozzle (5) is supplied with a cleaning liquid through the respective check valves (10). Air is supplied so that the solenoid valves (not shown) provided in the middle of the cleaning liquid pipe and the middle of the air pipe are closed, and then the pressure difference from the nozzle (5) due to the height difference or residual pressure of the pipe The check liquid (10) was used to prevent the washing liquid from flowing out.

Further, the exhaust device (8) is formed by forming an annular high pressure chamber (8c) in a tubular member (8b) having a throat (8a), as clearly shown in FIG. ) Is provided with an annular nozzle hole (8d) communicating with the high pressure chamber (8c) on its inner peripheral surface, and a port (8e) communicating with the high pressure chamber (8c) on its outer peripheral surface.
Air hose (12) that is provided with and supplies compressed air to it
Was connected to form an exhaust device using compressed air.

As shown in FIG. 2, the gas-liquid separation device (9) is provided with a baffle plate in a separation case (9a) fixed to a cross member (2b) of the frame body (2). The baffle plate (9b) extending downward from the upper surface and the baffle plate (9c) extending upward from the lower surface in the separation case (9a) are alternately arranged to form a vertically meandering flow path. An exhaust port (9d) was opened on the back wall of 9a). Then, the lower end of the tubular member (8a) of the exhaust device (8) was connected to the opening of the upper wall of the separation case (9a) through the connection pipe (13).

In this case, by constructing the baffle plates (9b) (9c) with corrugated plates as shown in FIG. 8, the meandering flow path can be substantially lengthened, and gas-liquid separation can be more effectively performed. Further, by cooling the baffles (9b) (9c), gas-liquid separation can be performed more effectively.

The discharge port (4) is formed to have a larger diameter than the coating pattern D of the coating gun A so that the sprayed paint is not scattered in the cleaning case (1) when the coating material remaining inside the coating gun is discarded. .

In the drawing, (14) shows an air nozzle for an air curtain which is provided in the cleaning case (1) so as to surround the insertion port (3).

FIG. 9 shows another embodiment, in which an insertion port (3) is provided in the upper wall of the cleaning case (1) and a discharge port (4) is provided in the peripheral wall portion, and the outer periphery of the case (1) is provided. A gas-liquid type cleaning nozzle (5) and an air nozzle (6) were provided so that the L-shaped coating gun B could be cleaned. An exhaust device (8 ') utilizing compressed air for forcibly exhausting the inside of the case (1) is provided at the exhaust port (4), and a gas-liquid separation device for introducing exhaust gas from the exhaust device (8'). (9 ') is provided.

In this case, if the discharge port (4) is arranged on the peripheral wall of the cleaning case (1), dirty cleaning liquid or dirt tends to collect on the bottom of the case (1).

Therefore, in the embodiment, a second discharge port (15) is provided on the bottom wall of the cleaning case (1), and compressed air for forcibly exhausting the inside of the case (1) is used for the second discharge port (15). A second exhaust device (16) is provided, and the exhaust gas from the second exhaust device (16) is introduced into the gas-liquid separation device (9 ').

By the way, the dirty cleaning liquid adhering to the inner surface of the upper wall of the cleaning case (1) drops from the edge of the inlet (3) and the coating gun B
It may adhere to and get dirty.

In this case, if the diameter of the insertion port (3) is increased, the contaminated cleaning liquid drops away from the coating gun and the above inconvenience can be solved. However, if the insertion port (3) is enlarged, the cleaning case (1 Mist inside) will be scattered outward from the insertion opening (3). Therefore, in the embodiment, the cleaning case (1)
A cylindrical member (17) having a lower end opening having a larger diameter than the upper end opening is provided at the edge of the insertion opening (3) on the outer surface of the upper side wall, and the dirty cleaning liquid travels along the inner surface of the cylindrical member (17). It was made to drip from the lower end edge of the mist to prevent the mist from scattering outward and prevent the dirty cleaning liquid from adhering to the coating gun B.

FIG. 10 shows still another embodiment, in which the cleaning case (1) is provided with an insertion port (3) on the left side wall and a discharge port (4) on the right side wall and the left side of the case (1). Gas-liquid mixing type cleaning nozzle (5) and air nozzle (6) on the outer circumference
And a cleaning nozzle (7) directed to the outer periphery of the tip of the coating gun on the outer periphery of the right side of the case (1), and further having a second discharge port (15) on the bottom wall of the case (1). Provided. Exhaust devices (8 ") (16 ') using compressed air are provided at the exhaust ports (4) (15), respectively, and exhaust from the exhaust devices (8") (16') is not shown. It was introduced into the gas-liquid separator via the pipes (18) and (19) so that the I-type coating gun A could be inserted from the lateral direction for cleaning.

Further, a liquid dripping prevention member (19) having a guide groove (19a) is provided at the edge of the insertion port (4) on the inner surface of the left side wall of the cleaning case (1) and is attached to the inner surface of the side wall of the cleaning case (1). The dirty cleaning liquid is guided downward by the guide groove (19a) so that the dirty cleaning liquid can be prevented from dripping from the edge of the insertion port (4) to the coating gun A.

Next, the operation of the embodiment will be described.

First, insert the coating gun into the cleaning case (1), then operate the exhaust devices (9) and (16) while cleaning the cleaning nozzle (5).
The coating gun is washed by jetting the gas-liquid mixed washing solution from (7).

Then, after the supply of the cleaning liquid is stopped, air is jetted from the air nozzle (5) to dry the coating gun and the cleaning of the coating gun is completed.

Dirty cleaning liquid or mist in the cleaning case (1) during the cleaning and drying of the coating gun is discharged from the discharge ports (4) (15) to the gas-liquid separator (9) and is separated in the separation case (9a). Liquid is separated and only gas is exhausted into the coating booth from the exhaust port (9d).

When the cleaning nozzles (5), (7) and the air nozzle (6) are provided on the outer periphery of the cleaning case (1) as in the above-described embodiment, the mist is not attached to these nozzles (5), (7), (6). This is advantageous because it can be prevented and the maintenance work can be easily performed. Also, if Teflon processing is applied to the inner surface of the cleaning case (1), dirt will not easily adhere to the cleaning case (1) and maintenance of the cleaning case (1) will be easy. This is advantageous.

(Effect of the Invention) As described above, according to the first aspect of the invention, it is possible to reliably prevent the mist in the cleaning case from scattering outward, and the small exhaust device for forcibly exhausting the inside of the cleaning case is sufficient. The equipment cost can be kept low, and further, the outflow of the cleaning liquid from the cleaning nozzle after the supply of the cleaning liquid can be prevented,
Problems such as the time required for drying the coating gun and the waste of cleaning liquid can be eliminated.

Further, according to the invention of claim 2, since the exhaust gas from the cleaning case can be effectively gas-liquid separated and only the gas can be exhausted into the coating booth, the inside of the coating booth can be prevented from being contaminated, and the gas-liquid separation can be achieved. Even if the device is provided, its structure is simple, so that the equipment cost can be kept low, and further, according to the invention of claim 3, the gas-liquid separation of the exhaust gas from the cleaning case can be performed more effectively. Have.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing an example of the device of the present invention, and FIG.
II-II line enlarged cutting front view of the figure, FIG. 3 is an enlarged cutting front view of the main part, FIG. 4 is the IV-IV line cutting plane view of FIG. 3, and FIG. 6 and 6 are cross-sectional views of a check valve, FIG. 7 is a cross-sectional view of an exhaust device, FIG. 8 is a cross-sectional view of essential parts showing a modified example of a gas-liquid separation device, and FIG. 9 is a cleaning device. 10 is a cutaway front view of the main part showing another embodiment of
The figure is a cutaway front view of a main part showing still another embodiment of the cleaning apparatus. (1) ... Washing case (3) ... Insertion port (4) (15) ... Discharge port (5) (7) ... Washing nozzle (8) (16) ... Exhaust device (9) ... Gas-liquid separation device (9a) … Separation case (9b) (9c)… Baffle plate (10)… Check valve (17)… Cylindrical member (19)… Liquid drop prevention member

Continuation of the front page (56) References JP-A-59-127671 (JP, A) JP-A-63-123458 (JP, A) Actually-opened Sho-61-121967 (JP, U)

Claims (3)

[Scope of utility model registration request] Claim: What is claimed is: 1. In a cleaning device for inserting a coating gun into a cleaning case having a cleaning nozzle and an insertion port into which the coating gun can be inserted with a gap around the cleaning gun and cleaning the same, coating the cleaning case. A discharge port is provided in a wall portion facing the nozzle at the tip of the gun, and an exhaust device for forcibly exhausting the inside of the cleaning case is provided at the discharge port, and a position of a cleaning liquid supply pipe connected to the cleaning nozzle near the cleaning nozzle. A coating gun cleaning device characterized in that a check valve that opens at a predetermined pressure or more is provided in the interior. 2. The coating according to claim 1, wherein a gas-liquid separation device, in which a baffle plate is arranged so that a meandering flow path is formed in the separation case, is connected to the discharge port by piping. Gun cleaning device. 3. The cleaning device for a coating gun according to claim 2, wherein the baffle plate is a corrugated plate.