JPH0150460B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention provides a system in which the order in which multi-colored paint is applied to a coating machine is programmed in advance in a top coating or intermediate coating line where multi-colored paint is applied to the body of an automobile.
The present invention relates to a control air supply device for opening and closing a color change valve, which is disposed in a multi-color coating device, and is configured to automatically change the color of paint by controlling the opening and closing of the color change valve based on this.

[Prior art and its problems]

FIG. 4 is a schematic explanatory diagram showing an example of a conventional multicolor coating device, in which 1 is an electrostatic coating machine, 2 is a color change device (CCV) having color change valves V1, V2 to Vn, T1 , T2 to Tk are paint feed pipes (not shown) that circulate and feed each color paint.
Paint supply pipes S1 and S2 are respectively branched from the color change valve and connected to the color change valve of the color change device 2, and cleaning air supply pipes and thinner supply pipes D1 and S2 are respectively connected to the color change valve. D2 to Dn are electromagnetic switching valves arranged at a required distance (for example, 5 to 6 m) from the color change device 2 by the number of color change valves, and E1, E2 to En are color change valves V1, V2 to Vn, and Solenoid switching valve D1, D2~
3. A control air supply pipe connected between Dn; is a sequencer that automatically opens and closes the electromagnetic switching valves D1, D2 to Dn according to a predetermined control program, and G1, G2 to Gn are its signal lines.

For example, when selectively supplying and spraying paint in the paint supply pipe T1 to the electrostatic atomizer 1 to which a high voltage is applied, the signal line G is connected from the sequencer 3 to the paint supply pipe T1.
1 to open the electromagnetic switching valve D1, and supply the control air supplied from the air supply pipe H to the control air supply pipe E1, and the control air supplied into the control air supply pipe E1. Therefore, the color change valve V1 of the color change device 2 is opened, and the paint in the paint supply pipe T1 is electrostatically applied from the discharge side collection path 4 of the color change device 2 through the flexible hose 5 through the color change valve V1. It is fed to the paint, etc. supply system leading to machine 1.

Then, when changing colors, sequencer 3
After stopping the output of the signal to the signal line G1 of the sequencer 3 and closing the electromagnetic switching valve D1 and stopping the supply of paint from the paint supply pipe T1, the signal line of the sequencer 3 is stopped.
Output a signal to Gn to open the electromagnetic switching valve Dn, supply control air from the air supply pipe H to the control air supply pipe En, open the color change valve Vn, and connect the cleaning air supply pipe S1 to the control air supply pipe En. Cleaning air is supplied to the electrostatic coating machine 1 to discharge remaining old paint from the collection path 4 into the electrostatic coating machine 1 to the outside.

Next, following the same procedure as above, thinner is supplied from the cleaning thinner supply pipe S2 to clean the collection path 4, flexible hose 5, and the inside of the electrostatic atomizer 1, and then the air supply pipe is supplied again. Cleaning air is supplied from S1 to discharge the remaining thinner to the outside, and then new paint is supplied.

As described above, in the conventional multi-color painting device, there are a large number of paint supply pipes T1, which supply multi-color paint and cleaning air, thinner, etc. to the color change device.
T2 to Tk, air supply pipe S1, thinner supply pipe S2, etc. are connected, and the same number of control air supply pipes E1, E2 to En are connected according to the number of color change valves V1, V2 to Vn. There is.

In addition, these control air supply pipes E1, E2 to En
The electromagnetic switching valve is installed for explosion-proof measures or to prevent the high voltage applied to the electrostatic coating machine 1 from leaking to the electromagnetic switching valves D1, D2 to Dn and destroying the electromagnetic switching valves. Valve and color change device 2
The length shall be selected to be sufficient to provide electrical isolation between the two.

Furthermore, the electromagnetic switching valves D1, D2 to Dn, which are arranged according to the number of control air supply pipes E1, E2 to En, are also relatively large and take up space.

Therefore, in the case of conventional multi-color coating equipment,
This method has disadvantages in that the number of piping materials and piping man-hours required for automatic color change is extremely large, which increases equipment costs, requires a large installation space, and requires extremely troublesome maintenance and inspection.

In particular, in automobile painting, multi-color painting is currently being performed, for example, with 30 or more colors, and the number of control air supply pipes E1, E2 to En and the number of solenoid switching valves D1,
As the number of installations of D2 to Dn has become extremely large, the above-mentioned drawback has become a serious problem.

[Purpose of the invention]

Therefore, the present invention significantly reduces the number of control air supply pipes and the number of installed electromagnetic switching valves, and at the same time significantly reduces the overall number of piping compared to the conventional one, and reduces the number of piping materials used in multi-color coating equipment. It is an object of the present invention to provide a new control air supply device for opening and closing a color change valve, which reduces piping man-hours, reduces equipment costs and installation space, and makes maintenance and inspection extremely easy.

[Structure of the invention]

In order to achieve the above object, the present invention provides a control air supply device for opening and closing a color change valve, which is installed in a multi-color painting device and performs automatic color change of paint, in which a color change valve supplied from an air supply source is used. A plurality of stages of two-way branch passages for conducting control air for valve opening and closing are formed in a chain, and a predetermined number of branch passages at the final stage are formed in accordance with the number of color change valves, and the two-way branch passages It is characterized in that an air-operated valve means is provided for collectively switching the flow path of the control air conducted to each stage.

[Example 1] The present invention will be described below based on specific examples shown in the drawings.

Fig. 1 is an explanatory diagram showing an example of a control air supply device for opening and closing a color change valve according to the present invention, Fig. 2 is an explanatory diagram showing another example, and Fig. 3 is an explanatory diagram showing an example of a control air supply device for opening and closing a color change valve according to the present invention. FIG. 1 is a schematic explanatory diagram showing the overall configuration of a coating device.

Note that parts common to the conventional multicolor coating apparatus shown in FIG. 4 are designated by the same reference numerals, and detailed explanation thereof will be omitted.

First, in FIG. 1, reference numeral 10 indicates color change valves V1 to V1 of the color change device 2, which are disposed near or integrally with the color change device 2.
This is a control air supply device that controls opening and closing of the V8.

In this control air supply device 10, color change valves V1 to V are supplied from an air supply source (not shown).
The first stage two-way branch line B1 is connected to the air supply pipe H' that supplies control air for opening and closing 8.
and second-stage two-way branch roads B2F and B connected in a chain to the branch ends a and b of the branch road B1, respectively.
2E, and third-stage two-way branch paths B3F, B3S, B3M, and B3E connected in a chain to each branch end c, d, e, and f of each of these branch paths B2F, B2E, respectively, are formed, The branch road B3F, B3
S, B3M and B3E branch ends g, h, i, j,
k, l, m, and n are connected to the color change valves V1 to V8 of the color change device 2, respectively, to form a number of control air supply paths corresponding to the color change valves V1 to V8.

And the branch paths B1, B2F, B2 of each stage
Air-operated three-way valves Y1, Y2, and Y3 are respectively installed in the branch parts of E and B3F to B3E, and are arranged at each stage from the first stage to the third stage. Valve control air supply pipe Q that collectively controls the opening and closing of the three-way valves Y1, Y2, and Y3 for each stage.
1, Q2, and Q3 are arranged in each stage, respectively.

These valve control air supply pipes Q1 to Q3 are extended by a required distance that is not affected by the high voltage applied to the electrostatic coating machine 1 from the control air supply device 10 according to the present invention, and each extended end is connected to the sequencer. Electromagnetic switching valves D1, D2, and D3 whose opening and closing are controlled by
It is connected to the.

The electromagnetic switching valves D1 to D3 also include three-way valves Y1 to Y for valve control air supply pipes Q1 to Q3.
An air supply pipe H for supplying pressurized air for controlling the opening and closing of 2 is connected.

In addition, when the three-way valves Y1 to Y3 are opened by being supplied with pressurized air from the valve control air supply pipes Q1 to Q3, the color change valves supplied from the air supply pipe H' A flow path is formed in which control air for opening and closing is conducted to the upper branch end side of each branch path as seen in FIG. 1, and valve control air supply pipes Q1 to Q3 are formed.
When the supply of pressurized air from the air supply pipe H' is stopped and the state is closed, a flow path is formed that conducts the control air supplied from the air supply pipe H' to the lower branch end side of each branch passage. It is done like this.

The above is the configuration of the control air supply device 10 according to the present invention shown in FIG. 1, and its operation will next be explained with reference to FIG. 3.

First, when selecting the paint in the paint supply pipe T1 connected to the color change valve V1 of the color change device 2 and supplying it to the electrostatic atomizer 1 for spraying, the signal lines G1 to G3 from the sequencer 3 are A signal is output to all solenoid switching valves D1 to D3 to open them, and the electromagnetic switching valves D1 to D3 are connected from the air supply pipe H to the solenoid switching valves D1 to D3.
Pressurized air is supplied to all of the valve control air supply pipes Q1 to Q3 through the valve control air supply pipes Q1 to Q3.

As a result, all the three-way valves Y1 to Y3 disposed in the first to third stages of the control air supply device 10 are opened, and the branch from the air supply pipe H' to the first stage is opened. The control air supplied to the path B1 is connected to the branch path B1.
through the upper branch end a of the second stage branch road B2.
F, and the upper branch end c of the branch road B2F
is fed to the third stage branch road B3F, which is the final stage, and is further fed to the branch end g above the branch road B3F.
The paint in the paint supply pipe T1 connected to the valve V1 is supplied to the color change valve V1 through the color change valve V1, and the paint in the paint supply pipe T1 connected to the valve V1 is supplied to the color change valve V1 through the discharge side collecting passage 4 of the color change device 2 and the flexible hose 5. It is supplied to the electrocoating machine 1 and sprayed.

That is, by collectively switching the three-way valves Y1 to Y3 arranged in each stage to the open state, the air supply pipe H' is connected to the branch end a of the branch path B1 to the branch end c of the branch path B2F. - An air flow path communicating with the branch end g of the branch path B3F is selectively formed, and control air for opening and closing the collar change valve fed from the air supply pipe H' is conducted into the air flow path to connect the collar. Change valve V1 is opened.

Next, for example, when changing the color of the paint in the paint supply pipe T6, first the signal lines G1 to
Control air is supplied to the air supply pipe H' with no signal being output to any of the solenoid switching valves D1 to D3, and therefore all of the electromagnetic switching valves D1 to D3 being closed.

In this case, valve control air supply pipes Q1 to Q3
Since pressurized air is not supplied from the air supply pipe H to all of Branch end b of branch path B1 from feed pipe H'
An air flow path communicating with the branch end f of the branch path B2E and the branch end n of the branch path B3E is formed, and the color change valve V8 to which the cleaning air supply pipe S1 is connected is opened, and the color change valve V8 of the color change device 2 is opened. The remaining old paint is discharged from the discharge side collection path 4 to the flexible hose 5 and the electrostatic coating machine 1 to the outside.

Next, a signal is output only to the signal line G3 of the sequencer 3 to open the electromagnetic switching valve D3, and pressurized air is supplied to the valve control air supply pipe Q3 to control the third stage of the control air supply device 10. Open 3-way valve Y3.

As a result, an air passage communicating from the branch end b of the branch road B1 to the branch end f of the branch road B2E to the branch end m of the branch road B3E is selectively formed, and the on-off valve to which the cleaning thinner supply pipe S2 is connected is formed. V7 is opened, and the discharge side collection path 4 of the color change device 2 and the inside of the electrostatic coating machine 1 are cleaned with thinner.

Next, using the same procedure as above, cleaning air is supplied from the air supply pipe S1 again to discharge the remaining thinner to the outside.

Then, a signal is output to the signal line G2 of the sequencer 3 to open the electromagnetic switching valve D2, and pressurized air is supplied only to the valve control air supply pipe Q2. Directional branch road B2F and B
Only the three-way valves Y2 and Y2 disposed at the branch part of 2E are opened.

As a result, the control air supplied from the air supply pipe H' to the first stage branch passage B1 is
is conducted to the lower branch end b side and fed to the second stage branch path B2E, and is conducted to the upper branch end e of the branch path B2E and fed to the third stage branch path B3M. Furthermore, the color change valve V6, which is connected to the lower branch end l of the branch passage B3M which serves as a control air supply passage for the color change valve V6, is opened, and the paint in the paint supply pipe T6 is opened. is supplied to the electrostatic atomizer 1 and sprayed.

As described above, the control air supply device for opening and closing the color change valve according to the present invention has three stages of two-way branch passages through which control air is conducted in a chain, and a three-way valve disposed at each stage. The eight color change valves installed in the color change device can be controlled to open and close by opening and closing the three valve control air supply pipes for each stage at once. There is no need for 8 control air supply pipes as in the color change equipment in multi-color painting equipment, and only 3 valve control air supply pipes can be used as air supply pipes, and 3 electromagnetic switching valves are required. Enough.

Therefore, piping materials and piping man-hours can be significantly reduced compared to the conventional method, reducing equipment costs, and at the same time, the installation space of the entire color changing device can be reduced, which is an excellent effect.

In addition, in the conventional multi-color painting apparatus shown in FIG. 4, due to a malfunction, signals are output from the sequencer 3 to two or more signal lines G1~, and two or more color change valves V1~ are simultaneously opened. There is a concern that paints of different colors may be simultaneously discharged from the paint supply pipes T1~, but if the controlled air supply device according to the present invention is used, if a malfunction occurs, the sequencer 3 will send signals to two or more signal lines G1~ at the same time. Even if is output, only one color change valve is always opened, and two or more colors of paint are not ejected at the same time, which prevents problems.

[Embodiment 2] Next, another example of the control air supply device 10 according to the present invention will be described based on FIG. 2.

In this example, a stacked piston valve P having a substantially cylindrical valve body 20 is used as an air-operated valve means that collectively switches the control air flow path for each stage.
1, P2 and P3 are used.

Each of these piston valves P1 to P3 has a body 21 made of, for example, die-cast aluminum alloy, and a perforation 23 through which a valve stem 22 is inserted.
A two-way branch path communicating with each other via the perforation 23 is bored.

That is, a first-stage two-way branch passage B1 having branch ends a and b is bored in the body 21 of the piston valve P1 connected to the air supply pipe H', and a first stage two-way branch passage B1 having branch ends a and b is bored in the body 21 of the piston valve P1 connected to the air supply pipe H'. A second stage two-way branch path B2F and B2E communicating with the branch ends a and b of the branch path B1 are bored, and a piston valve P
The third stage two-way branch road B3F, B3S, which communicates with the branch ends c, d of the branch road B2F and the branch ends e, f of the branch road B2E, is installed in the body 21 of No. 3.
B3M and B3E are drilled, and branch ends g, h, i, j, k, l, m, and n, which serve as air supply paths for the color change valves V1 to V8, are bored.

These piston valves P1 to P3 are stacked and connected, and the valve stem 22 of each piston valve P1 to P3 is
Valve control air supply pipes Q1 to Q3 are respectively connected to a piston 24 fixedly installed at one end, and a coil spring 25 is disposed at the other end of each valve rod 22 to cause the valve rod 22 to move toward the piston 24. Forced.

In addition, 26 in the figure is an O-ring that seals the connecting portion of the piston valves P1 to P3.

The above is the configuration of the control air supply device 10 shown in FIG. The valve stem 22 of the valve rod 22 is biased toward the piston 24, and in this state, each two-way branch passage is formed by the valve body 20 to form a flow passage for conducting control air to the lower branch end as seen in the figure. When pressurized air is supplied from the valve control air supply pipes Q1 to Q3, the pressurized air is supplied to the pistons 2 of the piston valves P1 to P3.
4, the valve stem 22 is pressed against the elastic force of the coil spring 25 to slide the valve body 20, and the flow path of the control air is reversed to the upper branch end of the two-way branch path. Switch all at once to the side.

Therefore, in this case as well, the valve control air supply pipe Q
By controlling the opening and closing of piston valves P1 to P3 by appropriately turning on and off the supply of pressurized air to Q1 to Q3, the first stage piston valve P1 connected to the air supply pipe H' is formed. 2-way branch road B1
and two-way branch passages B2F and B2 formed in the second stage piston valve P2 in conjunction with the branch passage B1.
E and the control air flow paths connected to the two-way branch paths B3F to B3E formed in the third stage piston valve P3 in series with the branch paths B2F and B2E, respectively, are connected to each other for each stage. It is possible to selectively form an air flow path that communicates with desired color change valves V1 to V8.

Note that the three-way valve Y1 explained in FIG. 1 may be used instead of the piston valve P1 as the valve means for switching the flow path of the first-stage two-way branch path B1.

[Operation and effect of the invention]

As described above, the control air supply device for opening and closing the color change valve according to the present invention has a chain of multiple stages of two-way branch passages that conduct the control air for opening and closing the color change valve supplied from the air supply source. A predetermined number of final stage branch passages are formed in accordance with the number of color change valves, and the flow passages for the control air conducted to the two-way branch passages are collectively formed for each stage. Since air-operated valve means for switching is provided, it is possible to open and close only two color change valves of the color change device by simply installing n valve control air supply pipes, the same number as the number of stages. can.

Therefore, by installing this control air supply device close to or integrally with the color change device, for example, 30 color paint supply pipes, cleaning air supply pipes, and thinner supply pipes can be connected to the color change valve. In the case of conventional multi-color coating equipment,
While 32 control air supply pipes and 32 electromagnetic switching valves were required, which were formed to the required length in consideration of explosion-proof measures or electrical insulation distance, in the present invention, the two-way branch path was constructed in five stages. Five valve control air supply pipes formed to a required length are arranged in the formed device of the present invention, and five electromagnetic switching valves are provided to control the supply of pressurized air to the valve control air supply pipes. Because all you have to do is install the This has an excellent effect in that the overall installation space is significantly reduced.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an example of a control air supply device for opening and closing a color change valve according to the present invention, FIG. 2 is an explanatory diagram showing another example, and FIG. 3 is an explanatory diagram showing an example of a control air supply device for opening and closing a color change valve according to the present invention. FIG. 4 is a schematic explanatory diagram showing an automatic color changing device for a multicolor coating device. FIG. 4 is a schematic explanatory diagram showing an automatic color changing device for a conventional multicolor coating device. Explanation of symbols, 1...Electrostatic coating machine, 2...Color change device (CCV), V1-V8...Color change valve, T1-T6...Paint supply pipe, S1...Air supply pipe for cleaning, S2...For cleaning thinner supply pipe,
3...Sequencer, G1-G3...Signal line, D1-D
3...Solenoid switching valve, 10...Control air supply device, Q1
~Q3...Air supply pipe for valve control, H'...Air supply pipe,
B1...First stage two-way branch road, B2F, B2E
...2nd stage two-way branch road, B3F, B3S, B
3M, B3E...Third stage two-way branch road, Y1~
Y3...3-way valve (valve means), P1-P3...piston valve (valve means).

Claims (1)

[Scope of Claims] 1. In a control air supply device for opening and closing a color change valve that is disposed in a multi-color painting device and that automatically changes the color of paint, a control for opening and closing the color change valve that is supplied from an air supply source. A plurality of stages of two-way branch passages for conducting air are formed in a chain manner, and a predetermined number of branch passages at the final stage are formed according to the number of color change valves. 1. A control air supply device for opening and closing a color change valve, characterized in that an air-operated valve means is provided for collectively switching the control air flow path for each stage. 2. A control air supply device for opening and closing a color change valve according to claim 1, wherein the valve means is a piston valve having a substantially cylindrical valve body.