JPS60102975A - Cleaner for supplying and feeding passage for water base coating material in coating machine - Google Patents

Abstract

PURPOSE:To discharge a coating material remaining in a pipe and clean a supplying and feeding passage, by a method wherein an air-supplying means and a water-supplying means are connected to a supplying and feeding passage for a water base coating material through a change-over means, pressurized air is fed first, and then pressurized water and pressurized air are fed. CONSTITUTION:The supplying and feeding passage L for a water base coating material is connected to a coating head 5, and the air-supplying means 19 and the water-supplying means 20 are connected to the passage L through the change-over means. A controlling means 31 so functions that pressurized air is first supplied and fed into the passage L by the means 19, and then pressurized water and pressurized air are supplied and fed in this order by the means 20, 19. Accordingly, after a coating operation is completed, the coating material remaining in the pipe can be discharged and recovered by supplying pressurized air into the passage L, so that the coating material is prevented from being wasted, and then the passage L is cleaned and dried by pressurized water and pressurized air.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cleaning device for a water-based paint feed path in a coating machine.

In a paint sprayer that uses water-based paint, when changing the color of the paint, the feed path between the paint tank and the painting head must be cleaned, but conventionally pressurized water or pressurized air was fed into the feed path. In the former case, the paint remaining in the feeding path mixes with the pressurized water for cleaning, making it impossible to reuse the remaining paint t1, and in the latter case, the remaining paint t1 cannot be reused. Since the residual paint in the feeding path cannot be completely removed, there is a problem in that the unremoved paint and the paint of the next color mix.

An object of the present invention is to provide the above-mentioned cleaning device that can eliminate such problems, and includes connecting an air supply means and a water supply means to a water-based paint supply path connected to a painting head via a switching means, After supplying pressurized air to the supply path from the air supply means,
A control means for controlling the switching means is connected to the switching means so that pressurized water and pressurized air can be supplied in this order from the water supply means and the air supply means.

An embodiment of the present invention will be described below with reference to the drawings. A support 3 is erected on the floor 2 of a booth 10 in an electrostatic coating machine, and a painting head 5 is attached to the support 3 via an insulating bracket 4. It will be done.

In addition, an insulating support stand 6 is placed at a predetermined distance from the head 5.
A paint tank 7 containing water-based paint P and a water tank 8 containing cleaning water W are placed on the support stand 6''.

The head 5 and the paint tank 1 are connected by a feeding path,
The feed path consists of a pump 10, a first pneumatic switching valve V with three-way switching capability, a second pneumatic switching valve V2 with two-way switching capability, and a connecting pipe connecting them. . The connecting pipe includes a first pipe section 91 that connects the paint tank 1 and the suction boat 11 of the pump 10, and a discharge port 1 of the pump 10.
2 and the first population 131 of the first switching valve V1.
a third pipe part 93 connecting between the pipe part 92, the first outlet 141 of the first switching valve 1/2, and the inlet 15 of the second switching valve V2;
It is composed of a fourth pipe section 94 that connects the first outlet 161 of the second switching valve V2 and the head 5.

The suction side end of the first pipe part 91 can be switched to the paint tank γ or the water tank 8 side, and the water tank 8
The cleaning water sucked by the pump 10 and passed through the first pipe section 91, the pump 10, and the second pipe section 92 is discharged to the drain bit 1γ that opens on the floor surface 2 of the booth 10 (the first switch valve V1 of the first switching valve V1). The first cleaning conduit 18 is connected to the second outlet 142 .

Collect the residual paint in the third pipe section 9J, and
Pipe portion 98,9. The air supply means 19 having a pneumatic pressure source such as an air compressor and the water supply means 20 having a water pressure source such as a water supply pump used for cleaning the head 5 are pneumatic type having two-way switching ability as a switching means. The first switch of the third switching valve V3. Second population 21. .

212 via pipes 22 and 23, and the outlet 24 of the third switching valve V3 is connected to the first switching valve V1 via a pipe 25.
is connected to the second population 132 of. In order to discharge the pressurized air and pressurized water supplied from the air supply means 19 and the water supply means 20 and passed through the third pipe line 93 to the paint tank 1 or the drainage bit 11, the second outlet 162 of the second switching valve r2 is provided with a second outlet 162 of the second switching valve r2. A second cleaning conduit 182 is connected. Therefore, the second cleaning pipe 18
The discharge side of 2 can be switched to the paint tank 1 or the drain bit 11 side.

A solenoid valve VS is disposed on the outer surface of the side wall of the booth 1, and an inlet 26 of the solenoid valve Vs is connected to the air pressure source 21 via a pipe 40, and the solenoid valves V, ? three exits 28, ~283
are the first to third switching valves V1 to V1 through pipes 291 to 293.
Connected to the V30 operating section.

Also, solenoid valve 1. An electric signal circuit 30 is connected to the actuating portion of the pipe 29. 〜293 through the first to third switching valves V
1 to Tl, pressurized air for operation is supplied. Further, the solenoid valve V9 has a built-in timer that sets the cleaning time, and the timer sets the cleaning time. The switching timing of the third switching valves V2 and V3 is controlled. Therefore, the solenoid valve t'? , the pneumatic source 21 and the electric signal circuit 30 are connected to the first to third switching valves V1 to
This constitutes a control means 31 for Tl.

Next, to explain the operation of this embodiment, before painting work, the first pipe section 9 is placed on the paint tank 1 side, and the first switching valve V1 is controlled by the control means 31 to
and the first exit 14. Furthermore, the second switching valve V2 is switched so as to communicate the population 15 and the first outlet 161.

During painting work, when the pump 10 is driven, the paint tank γ
The paint inside is fed to the head 5 via a feeding path, where it is atomized and electrostatically adheres to an object to be coated (not shown).

After the painting work is completed, the remaining paint inside the third pipe section 93 is collected by changing the paint color, etc., and the first pipe section 93 is recovered. Second pipe section 9. .

92 and the pump 10, in the first switching valve V, the first port 131 and the second outlet 14□ communicate with each other, and the second port 132 and the first outlet 141 communicate with each other. Joint valves V1 to V3 are controlled so that in the switching valve V2, the inlet 15 and the second outlet 162 communicate with each other, and in the third switching valve V3, the first port 211 on the air supply means 19 side and the outlet 24 communicate with each other. They are switched by means 31, respectively. On the other hand, the suction side end of the first pipe section 91 is switched to the water tank 8, and the discharge side of the second cleaning pipe 182 is switched to the paint tank γ side.

Then, the pump 10 is driven to draw cleaning water tr from the water tank 8.
When the cleaning water II/ flows through the first pipe section 9I, the second pipe section 92, the first switching valve 77, and the first cleaning pipe line 181, the first. Second pipe section 91, 9□ and pump 1
The paint remaining inside the tank is washed away with washing water W and
Is the water discharged into the water pit 17 and those parts cleaned? It is understood. At the same time, pressurized air from the air supply means 19 is supplied to the pipe line 22,
When the paint flows through the third switching valve V3, the pipe 25, the first switching valve I'7, the third pipe section 93, the second switching valve V2, and the second cleaning pipe 182, the paint remaining in the third pipe section 93 is removed. The paint is pushed out by pressurized air and returned to the paint tank 7, where the paint is recovered.

Next, the third. Fourth pipe section 9. ．． 94 and the head 5, in the first switching valve V, the second outlet 13□ and the first outlet 14. are in communication with each other, and in the second switching valve V2, the inlet 15 and the first outlet 16. Both valves V2 and V3 are switched by the control means 31 so that the third switching valve V3 initially communicates with the second port 212 on the water supply means 20 side and the outlet 24.

Then, the pressurized water from the water supply means 20 flows through the pipe line 23, the third switching valve V3, the pipe line 25, the first switching valve "I, the third pipe section 91, the second switching valve V2, and the fourth pipe section 94. When sprayed to the outside from the head 5, the paint remaining in the 3rd and 11th pipe sections 93, 94, the second switching valve V2, and the head 5 is washed away. ) has elapsed, the third switching valve V3 is switched to the air supply means 19 side by the control means 31, and this time the path from the third switching valve V3 to the head 5 is switched for the time reset by the timer (for example, 6 seconds). Pressurized air is supplied from the pipe line 22. As a result, paint and water remaining in each part are jetted out from the head 5 along with the pressurized air, and each part is continuously cleaned and dried. It will be held on.

Next, when the time set by the timer (for example, 10 seconds from the start of cleaning) has elapsed, the control means 31 switches the second switching valve V2 to the second outlet 16 on the second cleaning pipe line 182 side.
2, and the discharge side of the second cleaning pipe 182 is switched to the water control pit 11 side. Similarly to the above, the pressurized water from the water supply means 20 and the pressurized air from the air supply means 19 are supplied to the pipe 22 or 23 in this order; the third switching valve V3; the first switching valve 7; the third pipe section 92; The water flows through the second switching valve I/2 and the second cleaning pipe 18□ to perform cleaning and drying of the second cleaning pipe 182 (1).

After that, replace the paint tank of the next color with the previous paint tank 1, and open the first pipe line 9. The suction side end of is switched to the Uri tank side, and the first switching valve V
and the second switching valve V so that the first outlet 141 communicates with the
2, both valves V, so that the inlet 15 and the first outlet 161 communicate with each other.

V2 is switched by the control means 31 to prepare for the next painting operation.

As described above, according to the present invention, the paint remaining in the supply line can be discharged and recovered by the pressurized air supplied to the supply line after the painting work is completed, thereby eliminating waste of paint and making it economical. can improve sex. In addition, unremoved paint can be discharged using pressurized water and pressurized air fed to the feed path, and the feed path can be continuously cleaned and dried, so cleaning the feed path during color change work, etc. can be done efficiently.

[Brief explanation of drawings]

The drawing is a system diagram of one embodiment of the present invention. L... Feeding path, P... Water-based paint, V3... Third switching valve as switching means, 5... Painting head, 19... Air supply means, 2o...
・Water supply means, 31...control means

Claims (1)

[Claims] An air supply means and a water supply means are connected to a water-based paint supply passage connected to a painting head via a switching means, and after pressurized air is supplied from the air supply means to the supply passage, the water supply and a control means for controlling the switching means so that pressurized water and pressurized air can be supplied in this order from the air supply means, the supply path for water-based paint in a coating machine being connected to the switching means. cleaning equipment.