JPS5935273B2 - Color change equipment for colored powder coating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a color changing device for a powder coating device that performs painting by selectively supplying two or more types of colored powder together with pressurized air to one spray gun and ejecting the powder. It is something.

Conventionally, this type of color changing device has been constructed by connecting each end of a plurality of introduction hoses that independently feed a plurality of colored powders to each other.
It has been proposed that a spray gun is selectively fitted to the end of an injection hose to which a spray gun is connected, either manually or mechanically, to change the color.

However, in this method of selectively fitting each hose to each other, the fitting process takes time;
In addition, a space for the fitting work is inevitably required. The present invention was made in view of the above-mentioned problems, and its purpose is not only to change the color of each colored powder without mixing them with each other, but also to enable this color change to occur during the fitting process. It is an object of the present invention to provide a color changing device which can be changed within a short period of time without requiring a color changing device and which can be configured compactly.

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 shows a colored powder coating apparatus 10 embodying the present invention, and this coating apparatus 10 is equipped with a supply tank Ta for A color powder (a supply tank Tb for 5B color powder).

Each tank Ta-Tb houses a mixing tank 1la and Ilb for mixing colored powder and pressurized air, respectively, and these mixers 11a and Ilb are connected to the main pipe 13 by pipes 12a and 12b. , a color changing device 1 according to the present invention, which is connected to a spray gun 16 by introducing hoses 15a and 15b.
0'. Further, the color changing device 10' includes each introduction hose 1Ta to 17c and each introduction hose 18a to 18.
d to pipes 17 and 18 communicating with the main pipe 13, respectively. Note that pressurized air is supplied to this main pipe 13 from an air compressor 14 through a purifying device 14a. On the other hand, each of the above-mentioned pipes 12a, 12b, 17
And each introduction hose 18a to 18d has a solenoid valve 5L1 to
5L7 is interposed, and each of these solenoid valves 5L1 to 5L7
is opened and closed by the control device 19 to control the inflow of pressurized air from the main pipe 13. Note that symbols R1 to R4 indicate pressure regulating valves that respectively adjust the pressure of the pressurized air fed toward the electromagnetic valves 5L1 to 5L7. Next, the color changing device 10', which is the main part of the present invention, will be explained. As shown in FIG. It's on.

The connector body 20 has an outflow passage 21 and two inflow passages 22 and 23 that communicate with each other, and a hose 16a of the spray gun 16 is airtightly connected to the outflow passage 21. The connector body 20 also has an inlet 24 to which the introduction hose 17c of the pipe line 17 is connected, and the inner end of the inlet 24 connects to the outlet passage 21 between the inlet passages 22 and 23. It is open towards. In addition, both inflow passages 22, 2
3, the outflow passage 21 is opened without abruptly changing its angle.
It has been communicated with. The connecting pipe 30 is connected to the introduction hose 15a described above at a base 31 located at its upstream end,
It is connected to the inflow passage 22 of the connector body 20 at a base 32 located at its downstream end.

Further, a pair of front and rear on-off valves 33 and 34 are provided between both mouthpieces 31 and 32 of this connecting pipe 30, and these on-off valves 3
3 and 34 are airtightly connected by a connecting pipe 35.
The front (upstream side) on-off valve 33 has a flexible tube 33a made of rubber, synthetic resin, etc., and a cylindrical body 33c forming a pressure chamber 33b around the outer periphery of the flexible tube 33a. moreover,
The cylindrical body 33c of this on-off valve 33 is a pressurized air inlet 33d.
The above-mentioned pipe line 18 is connected to this inlet port 33d.
The introduction hose 18a is connected. Similarly to the on-off valve 33, the rear (downstream side) on-off valve 34 includes a flexible tube 34a made of rubber, synthetic resin, etc., and a cylindrical body 34c forming a pressure chamber 34b around the outer periphery of the flexible tube 34a. And this cylinder 34
and an inlet 34d formed at c and to which the introduction hose 18b of the conduit 18 is connected. The connecting pipe 35 connects the flexible pipes 33a, 34a of the on-off valves 33, 34 to each other in an airtight manner.
A flow path 35a is formed to communicate with each other. The connecting pipe 35 is also provided with an inlet 36, and pressurized air is fed into the flow path 35a of the connecting pipe 35 from the introduction hose 17a of the conduit 17 connected to the inlet 36. Thus, in this connecting pipe 30, when both the on-off valves 33 and 34 are in the open state, a passage is formed from the introduction hose 15a to the inflow passage 22 of the connector body 20. In this case, the passage has the same diameter so that colored powder does not accumulate in any part. For example, in the upstream opening/closing valve 33, when pressurized air is supplied from the introduction hose 18a into the pressure chamber 33b, this air pressure causes the flexible tube 33 to
A portion of a is immediately crushed and its inner walls are brought into close contact with each other. This brings the on-off valve 33 into a completely closed state.
This also applies to the on-off valve 34. Note that when the pressure in each pressure chamber 33b, 34b is brought to atmospheric pressure, each flexible tube 33a, 34a returns to a tube state due to its elastic force, and each on-off valve 33, 34 becomes open. In addition, the connecting pipe 4
0 is exactly the same as the above-mentioned connecting pipe 30 described using the 30's code, so each member of the connecting pipe 40 corresponding to each member of the connecting pipe 30 is given the same 40's code. It is attached in the figure and its explanation is omitted.

In this case, the caps 41 and 42 located at both the upper and lower ends are respectively connected to the inflow passage 23 of the introduction hose 15b/connection body 20, and the introduction hoses 18c and 18d of the conduit 18 are connected to the inflow ports 43d and 44d, respectively. Connected. Further, the inlet hose 1 of the conduit 17 is connected to the inlet 46 of the connecting pipe 40.
7b is connected. Thus, in this connecting pipe 40, when both the on-off valves 43 and 44 are in the open state, a passage is formed from the introduction hose 15b to the inflow passage 23 of the connector body 20. Furthermore, in each on-off valve 43, 44, when pressurized air is supplied from each introduction hose 18c, 18d into each pressure chamber 43b, 44b, each flexible tube 43a, 44a is immediately pushed by the air pressure. crushed,
Each on-off valve 43, 44 is in a closed state. Conversely, when the air pressure in each pressure chamber 43b, 44b is set to atmospheric pressure, each on-off valve 43, 44 will open and close both on-off valves 33, 44 of the connection pipe 30 described above.
34, it is in an open state. Further, in the powder coating apparatus 10 described above, the opening and closing operations of the electromagnetic valves SLl to SL7 are set in advance by the control device 19 so as to be performed in conjunction with each other as follows.

That is, when starting the powder coating apparatus 10, after confirming the operation of the air compressor 14 and the purifying device 14a and the specified pressure of each pressure regulating valve R1 to R4, the control device 19 gives a specified color instruction, for example, A color powder. When an instruction is given to eject powder, the solenoid valve SL of the A-color powder supply tank Ta
1 is opened, and at the same time, the solenoid valve SL2 of the B color powder supply tank Tb, the cage valve SL3 of the pipe line 17, and both introduction hoses 1 are opened.
Each solenoid valve SL4, SL5 of 8a, 18b is closed, and solenoid valve SL6, SL7 of both introduction hoses 18c, 18d is closed.
will be held. The solenoid valves SL4 to SL7 installed in the introduction hoses 18a to 18d, when opened, transfer pressurized air from the main pipe 13 to the pressure chambers 33b, 34b, 43b of the connecting pipes 30, 40. , 44b, and when the closed state is reached, the inflow of pressurized air is stopped and each introduction hose 18a to 18d is communicated with the outside air to reduce the pressure in each pressure chamber 33b, 34b, 43b, 44b. The pressure is set to atmospheric pressure. Furthermore, when the control device 19 issues a color change instruction from color A powder to color B powder, first solenoid valves SLl, SL2, SL5, and SL7 are closed, and solenoid valve SL3 is intermittently opened and closed for several tens of seconds. Repeat. Thereafter, the two solenoid valves SL2, SL4, and SL5 are opened, and the two solenoid valves SL1, SL3, SL6, and SL7 are closed. Furthermore, when a color change instruction from color B to color A is issued, the above-mentioned operation 1 is performed, and then solenoid valves SL1, SL6, and SL7 are opened, and solenoid valves SL2 to SL5 are closed. Furthermore,
When a stop instruction is issued by the control device 19, the above-mentioned operation 1 is performed, and then the solenoid valve SL3 is completely closed.
Next, the operation of the color changing device 10' described above will be explained with reference to FIG.

First, for example, if it is desired to perform coating with A color powder, the control device 19 issues an A color instruction after checking the operating status of each part. Then, solenoid valve SLl opens and solenoid valve SL
2 is closed, and only the A color powder in the supply tank Ta is fed to the color changing device 10' together with pressurized air. Also, at this time, the solenoid valves SL4 and SL5 are closed, and as shown in A in FIG. Valve 3
3 and 34 are opened, and the solenoid valves SL6 and SL are opened.
7 is opened, pressurized air is fed into the pressure chambers 43b, 44b of the connecting pipe 40, and the on-off valves 43, 44 are closed. Note that at this time, the solenoid valve SL3 is in a closed state. As a result, the A color powder flows from the connecting pipe 30 into the inflow passage 22 of the connector body 20 together with the pressurized air and is ejected from the spray gun 16, thereby performing coating with the A color powder. At this time, a part of the A color powder flows back into the inflow passage 23 of the connector body 20, but the on-off valve 44 of the continuous pipe 40
Since it is in a closed state, the water does not flow backward into the continuous pipe 45.
Next, if it is desired to perform coating with B-color powder after coating with this A-color powder, the control device 19 issues a color change instruction to B-color powder.

Then, first, the solenoid valves SLl and SL2 are closed, and in the color changing device 10', the solenoid valves SL4 and SL6 are opened, so that pressurized air is supplied to each pressure chamber. 33b, 43b, each upstream on-off valve 33, 43 is in a closed state, and each solenoid valve S
By closing L5 and SL7, the pressure chambers 34b and 44b become atmospheric pressure, and the on-off valves 34 and 44 on the downstream side become open. Furthermore, in this case, the solenoid valve SL3 is intermittently opened and closed. As a result, pressurized air for cleaning is supplied to each inlet 24, 3.
6, 46 into the connector body 20 and both connecting pipes 30, 40 intermittently for several tens of seconds, and the remaining powder in the passage from each connecting pipe 30, 40 to the spray gun 16 is removed together with pressurized air. It is sprayed from the spray gun 16 to the outside for cleaning. Thereafter, the solenoid valves SL, SL3 are closed and the solenoid valve SL2 is opened, and only the B color powder is fed to the color changing device 10' together with pressurized air. At this time, in the color changing device 10'', each on-off valve 33 is opened by opening the solenoid valves SL4 and SL5, as shown by B in FIG.
, 34 are closed, and the solenoid valves SL6, SL7 are closed.
By closing, each on-off valve 43, 44 becomes open. As a result, the B color powder flows from the connecting pipe 40 into the inflow passage 23 of the connector body 20 together with the pressurized air and is ejected from the spray gun 16, thereby performing coating with the B color powder. At this time, since the on-off valve 34 of the connecting pipe 30 is closed, the B color powder does not flow back into the connecting pipe 35. In addition,
If it is desired to perform coating with A color powder after coating with B color powder, the above-mentioned operation may be reversed. As described above, in the color changing operation of the color changing device 10' according to the present invention, the solenoid valves SLl to SL7 are interlocked with each other to selectively supply pressurized air, and the connecting pipes 30, 40
Since the on-off valves 33, 34, 43, and 44 are opened and closed, the color change is performed within a short time.

Furthermore, since the color is changed by opening and closing the on-off valves 33, 34, 43, and 44, when installing this color changing device 10', it is necessary to
, 40 is all that is needed. In the above embodiment, the color changing device 10'' was described which is configured to switch between two colored powders of A and B. However, if it is desired to switch between three or more colored powders, the connector body 20 may further be provided with an inflow passage communicating with the outflow passage 21, and connecting pipes similar to the respective connecting pipes 30 and 40 may be connected to this inflow passage.

In this case, the powder introduction hose from the added paint tank is connected to the added connecting pipe. Further, in the above embodiment, the on-off valves 33, 34, which are closed by appropriately supplying pressurized air from the air compressor 14,
Although an example using valves 43 and 44 has been described, valves that are opened and closed by other means may also be used. Furthermore, if the inlet 24 of another connector body 20' is connected to the outflow passage 21 of the connector body 20 described above, and the spray gun 16 is connected to the outflow passage 21 of this other connector body 20', three It is possible to change the color of more than one type of colored powder. As described in detail above, in the present invention, as exemplified in the above embodiment, the outflow passage 21 to which the spray gun 16 is connected, and the plurality of introduction hoses 15a and 15b that independently feed the colored powder are provided. connecting pipe 3
0, 40 are connected to the inflow passages 22, 23 communicating with the outflow passage 21, and each connecting pipe 30 and 40 is provided with a pair of front and rear opening/closing valves 33, 34, respectively.
and 43, 44, and each pair of on-off valves 3
3, 34 and 43, 44 to which inlet hoses 17a, 17b for introducing pressurized air for cleaning are connected, respectively.
6 and 46 are provided, which makes it possible to change the color of each colored powder without mixing with other powders, as well as to change the color in a short time. It is possible to provide a color changing device capable of performing the following, and furthermore, this color changing device has a compact configuration.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of a colored powder coating device embodying the present invention, Fig. 2 is an enlarged vertical sectional view of the color changing device, and Fig. 3 is a schematic diagram of the operation of the color changing device shown in Fig. 2. It is. Explanation of symbols, 10...Colored powder coating equipment, 10
'...Color changing device, 15a, 15b...
Introduction hose, 16...Spray gun, 17a~
17b, 18a to 18d...Introduction hose, 20
...Connector body, 21...Outflow passage, 2
2, 23...Inflow passage, 30...Connecting pipe, 33, 34...Opening/closing valve, 36...
Inlet, 40... Connecting pipe, 43, 44...
...Opening/closing valve, 46...Inflow port, SLl~SL7
······solenoid valve.

Claims (1)

[Claims] 1. A connection having an outflow passage to which a spray gun is connected, and a plurality of inflow passages to which connecting pipes of a plurality of introduction hoses each independently feeding two or more types of colored powder are connected and communicate with the outflow passage. A container body is provided, and each of the connecting pipes is provided with a pair of front and rear on-off valves, and a pressurized air inlet to which a cleaning pressurized air introduction hose is connected is provided between each pair of on-off valves. , with each on-off valve on the upstream side of each of the connecting pipes closed and each on-off valve on the downstream side open, pressurized air flowing in from each of the inlets causes the passage from inside each connecting pipe to the spray gun to be After cleaning the remaining powder, each on-off valve in the connecting pipe of the introduction hose to which the desired colored powder is fed is opened, and each on-off valve in the other connecting pipe is closed. Color change device.