JPH0630290Y2 - Switching device for color change valve - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is a color changer for selectively opening and closing a large number of color change valves provided in a multi-color coating device in accordance with a pre-programmed supply order of each color paint. The present invention relates to a valve opening / closing device.

[Conventional technology]

In this type of device, one control air supply pipe is connected to each color change valve, and the electromagnetic change valves provided in the respective control air supply pipes are opened and closed to open and close the color change valves. Has become.

However, in this case, it is necessary to provide a large number of electromagnetic switching valves, which are expensive and large and take up a large number of installation locations, in accordance with the number of color switching valves.

In addition, to prevent explosion, and to prevent the electromagnetic switching valve from being damaged by leakage of high voltage applied to the electrostatic coating machine, there is electrical insulation between the color switching valve and the electromagnetic switching valve. Therefore, the length of each control air supply pipe connected between them must be very long.

Therefore, the equipment cost of the entire apparatus is increased, and at the same time, the installation space is increased, and maintenance and inspection are very troublesome.

Therefore, as disclosed in JP-A-60-222162, the present applicant reduces the number of control air supply pipes and the number of installed electromagnetic switching valves to reduce equipment cost and installation space. A plurality of two-way branch passages for connecting the control air for opening and closing the color change valves are formed in a chain, and the final stage branch passages are formed by the number corresponding to the number of color change valves. We proposed a color-changing valve opening / closing device in which an air-actuated piston valve that switches the control air flow path for each stage at the branch portion of the directional branch path is arranged.

According to this, for example, in the conventional case where multicolor coating of 30 colors is performed, 32 control air supply pipes connected to 32 color change valves including the color change valves to which the cleaning air and the cleaning solvent are supplied. When 32 electromagnetic switching valves were required, the control air supply pipe for opening and closing the color switching valve was only 1
Only a book is needed, and other than that, 5 bidirectional branches
It suffices to provide a total of five piston valve opening / closing control air supply pipes that are formed in stages and provided only one for each stage, and a total of five electromagnetic switching valves that are connected to the control air supply pipes. Therefore, the number of control air supply pipes and the number of electromagnetic switching valves installed are significantly reduced.

[Problems to be solved by the device]

However, when the two-way branch passages are formed in multiple stages and the piston valves are arranged in each stage in this manner, there is a problem that the mechanism becomes large and the weight becomes heavy.

Further, there is a problem that it takes time for the control air to sequentially pass through the two-way branch passages of each stage and reach the color change valve, and the response speed of the color change valve becomes slow.

Furthermore, if even one piston valve provided at the branch portion of each two-way branch path fails or malfunctions, there is a problem that the opening / closing control of the entire color change valve becomes impossible.

And, these various problems have been manifested as a particularly remarkable adverse effect in an apparatus such as an automobile coating in which two or more bidirectional branch paths are formed in a chain of 6 stages or more to perform multicolor coating of 50 colors or more. It was

In view of this, the present invention reduces the size and weight of the entire color change valve opening / closing device, improves the responsiveness of the color change valve in particular, and prevents the opening / closing control of the entire color change valve from being disabled due to a failure occurring at one location. This is a technical issue.

[Means for Solving the Problems]

In order to solve this problem, the present invention relates to a color-changing valve opening / closing device that selectively opens and closes a large number of color-changing valves provided in a multicolor coating device, in which both of two air input terminals are provided. A plurality of air elements having a logical function of outputting air from one air output terminal only when air is input to the air and connecting the air output terminal to exhaust air when air is not input to one of the air input terminals. Are arranged vertically and horizontally, and a column control air supply pipe connected to each column of the air elements in the column, and a row control air supply pipe connected to each row of the air elements in the row. Is provided, and the two air input terminals of each air element are respectively connected to the column control air supply pipe and the row control air supply pipe, and the air output terminal of each air element is connected to each color change valve. It is characterized by

[Action]

According to the present invention, when a specific control air supply pipe for a column and a control air supply pipe for a row are selected one by one and control air is supplied to each of them, one is supplied to each of these control air supply pipes. Air output is obtained only from the air output terminal of the air element to which the air input terminal is connected, and only the color change valve connected to the air output terminal is opened.

When one of the control air supply pipes stops supplying the control air, the air for opening the color change valve is not output from the air output terminal of the air element, and at the same time, the air for which the color change valve has been opened is changed to the air element. The color change valve is instantly closed after being exhausted.

〔Example〕

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

FIG. 1 is an overall view showing an example of an opening / closing device for a color change valve according to the present invention, and FIG. 2 is a sectional view of an air element used therein.

In this example, air was input to both of the two air input terminals a and b in accordance with the number of color change valves V _{1 to} V ₉ connected to the electrostatic coating machine 1 via the paint hose 2. A total of nine air elements M ₁ having a logic function of outputting air from one air output terminal s only when no air is input to one air input terminal a and connecting the air output terminal s to the exhaust e ~M _9, are arranged side by side three each in vertical and horizontal directions.

Air elements M ₁ , M ₄ and M ₇ forming a column, M ₂ ,
And M ₅ and _{M 8,} M 3, the _{M 6} and _{M 9,} respectively for each column, three column control air supply pipe _E 1 that are collectively connected to its air input terminal a, E ₂ and E ₃ are provided.

Also, air elements M ₁ , M ₂ and M ₃ forming rows,
Each of M ₄ , M ₅ and M ₆ and M ₇ , M ₈ and M ₉ has a row of control air supply pipes E which are collectively connected to the input terminal b of each line. ₄ , E ₅ and E ₆ are provided.

Then, the air output terminals s of each of the air elements M _{1 to} M ₉
Are connected to the color change valves V _{1 to} V ₉ , respectively.

Further, the control air supply pipes E _{1 to} E ₆ are controlled at positions separated from the color change valves V _{1 to} V ₉ connected to the electrostatic coating machine 1 to which a high voltage is applied, by a distance that can be electrically insulated. Electromagnetic switching valves D _{1 to} D ₆ for turning air on and off are provided.

The color change valves V _{1 to} V ₇ are connected to the supply sources of the respective color paints, and the color change valves V ₈ and V ₉ are connected to the supply sources of the cleaning air and the cleaning solvent, respectively.

Further, as shown in FIG. 2, each of the air elements M _{1 to} M ₉ is
When air is input from the air input terminal a, the air flow path 3 communicating from the air input terminal b to the air output terminal s is communicated with and the air flow path 4 communicating from the air output terminal s to the exhaust e is blocked, and the air input When air is not input from the terminal a,
A valve body 5 is built in that blocks the air flow path 3 and allows the air flow path 4 to communicate with each other.

When the valve body 5 is input from the air input terminal, the pressure of the air acts on one side and bulges to the other side, so that the air passage 3 communicates with the air passage 4. It is designed to float in the blocking direction.

The above is the configuration of the apparatus shown in FIG. 1, and its operation and effect will be described below.

First, when starting the coating of, for example, white paint supplied to the color change valve V ₁ , the column control air supply pipe E ₁
An electromagnetic switching valve D ₁ interposed, by opening the electromagnetic switching valve D ₄ interposed in row control air supply pipe E _4, control air to both the air input terminals a and b of the air element M ₁ To enter.

As a result, the control air input from the air input terminal b is output from the air output terminal s through the air flow path 3, the color change valve V ₁ connected to the air output terminal s is opened, and the color change valve concerned is opened. White paint is supplied from the valve V ₁ to the electrostatic coating machine 1 through the paint hose 2.

When the white paint is applied in this manner and then the color is changed to, for example, the red paint supplied to the color change valve V ₄ , first, the electromagnetic change-over valves D ₁ and D ₄ are closed and the air element M ₁ is closed. Stop the supply of control air to the.

As a result, the air flow path 3 communicating from the air input terminal b of the air element M ₁ to the air output terminal s is blocked, and the supply of control air to the color change valve V ₁ is stopped, and at the same time,
The air flow path 4 communicating from the air output terminal s to the exhaust e communicates with each other, and the control air supplied to the color change valve V ₁ from the air output terminal s is quickly withdrawn to the outside of the system, and the color change valve V ₁ concerned. Will be closed instantly.

Then, the electromagnetic switching valve D ₂ provided in the column control air supply pipe E ₂ and the electromagnetic switching valve D ₆ provided in the row control air supply pipe E ₆ are opened to open the air of the air element M ₈ . Control air is input to both the input terminals a and b.

Thus, color changing valve V ₈ from the air output terminal s control air is an output of the air element M ₈ is opened, the color change paint hose 2 by the cleaning air supplied from the valve V ₈
The white paint remaining inside and inside the electrostatic coating machine 1 is discharged to the outside.

Then, this time, the electromagnetic switching valve D ₃ provided in the column control air supply pipe E ₃ and the electromagnetic switching valve D ₆ provided in the row control air supply pipe E ₆ are opened to open the air element M ₉ Control air is input to both the air input terminals a and b.

Thus, output control air from the air output terminal s of the air element M ₉ color changing valve V ₉ is opened, the color change paint hose 2 by the cleaning solvent supplied from the valve V ₉
The white paint adhering inside and inside the electrostatic coating machine 1 is washed out.

Then, the color changing valve V ₈ is opened and closed again by the same operation as described above to discharge the cleaning solution remaining in the paint hose 2 and the electrostatic coating machine 1 to the outside by the cleaning air.

This way, the paint in the hose 2 and the electrostatic coating machine 1 is completely cleaned, an electromagnetic switching valve D ₁ interposed in cascade control air supply pipe E _1, row control air supply pipe E ₅ is opened to open the electromagnetic switching valve D ₅ and the air element M
Control air is input to both the air input terminals a and b of No. ₄ .

Thus, the output control air only from the air output terminal s of the air elements M _4, color changing valve V ₄ which is connected to the air output s is opened, through the paint hose 2 from the color change valve V ₄ The red paint is supplied to the electrostatic coating machine 1.

As described above, according to this example, the control air supply pipes E _{1 to} E ₃ for columns and the control air supply pipes E for rows ₃ each having three columns and three columns.
₄ to E _6, a combination of one by one vertically and horizontally by simply selecting one set, only one pair selected combination of one by one vertically and horizontally, alternatively control nine from the air element M ₁ ~M ₉ Air can be output to open and close the _nine color change valves V _{1 to} V ₉ .

Therefore, the piping of the controlled air supply pipe _E 1 to E _6, the electromagnetic switching valve _{D 1} interposed electromagnetic switching valve _D 1 to D ₆ interposed these to the control air supply pipe _E 1 to E ₆ ~ D
The number of arranged ₆ is smaller than the number of air elements M _{1 to} M ₉ corresponding to the number of color change valves V _{1 to} V ₉ , and the equipment cost and the installation space of the entire apparatus are significantly reduced.

In addition, the control air input to each of the air elements M _{1 to} M ₉ is
Since the color change valves are directly output to the color change valves V _{1 to} V ₉ , as compared with the conventional example, the control air is supplied to each color change valve through a two-way branch passage formed in a plurality of stages in a chain. The overall structure is remarkably simplified, the size and weight are reduced, and the response speed of the color change valves V _{1 to} V ₉ is increased.

In addition, each of the air elements M _{1 to} M ₉ has a color change valve V _{1 to} V.
At the same time as stopping the supply of the control air for opening ₉ of the color change valves V _{1 to} V ₉ , the control air for opening the color change valves V _{1 to} V ₉ is discharged from the exhaust gas e, so that the color change valves V _{1 to} V ₉ are released. The response speed of not only the opening speed but also the closing speed is very fast, and the color change time is greatly shortened.

Furthermore, since the operation of each air element M _{1 to} M ₉ is not affected by the other air elements, even if any one of the air elements M _{1 to} M ₉ fails, the entire color change valves V _{1 to} V ₉ will be affected. There is no problem of being unable to open and close.

In addition, if the number of color change valves is further increased, the third
As shown in the figure, in addition to the existing air elements M _{1 to} M ₉ ,
Air elements M ₁₀ , M ₁₁ and M ₁₂ each of which has two air input terminals a and b connected in series to the control air supply pipes E ₁ , E ₂ and E ₃ for tandem at its terminal side, Similarly, two air input terminals a and b are provided with air elements M ₁₃ , M ₁₄ and M ₁₅ , which are connected in series to the row control air supply pipes E ₄ , E ₅ and E ₆ , respectively. Each air element M ₁₀
˜M ₁₅ may be connected to the newly added color change valves V _{10 to} V ₁₅ .

In this case, for example, by opening the electromagnetic switching valve D ₁ and D ₃ that are both disposed in cascade control air feed pipe E ₁ and E _3, two air input control to the terminals a and b of the air element M ₁₄ By inputting air, control air is output from the air output terminal s of the air element M ₁₄ and the color change valve V ₁₄
Is released.

By doing so, a total of six control air supply pipes E _{1 to} E
₆ , ₆ C ₂ = 6 × 5/2 = 15 air elements M _{1 to} M
₁₅ kinds of control air are output alternatively from 15,
Since the individual color change valves V _{1 to} V ₁₅ can be controlled to be opened and closed, the equipment cost and installation space of the entire apparatus are significantly reduced.

[Effect of device]

As described above, in the device of the present invention, the number of control air supply pipes for opening and closing the color changing valve and the number of electromagnetic switching valves installed are significantly reduced as compared with the conventional one, so that the equipment cost and installation space of the entire device are reduced. Not only is it significantly reduced, but the responsiveness of the color change valve is also extremely fast, so the time for color change performed by alternately opening and closing each color change valve that supplies paint, cleaning air, and cleaning solvent is also significantly reduced. It has an excellent effect.

[Brief description of drawings]

FIG. 1 is an overall view showing an example of an opening / closing device for a color change valve according to the present invention, and FIG. 2 is a sectional view of an air element used therein.
FIG. 3 is an overall view showing another example of the present invention. Explanation of symbols V _{1 to} V ₁₅ ... color change valve, M _{1 to} M ₁₅ ... air element,
a: Air input terminal, b: Air input terminal, s: Air output terminal, e: Exhaust gas, E _{1 to} E _3: Column control Air supply pipe, E _{4 to} E _6: Row control Air supply pipe.

Claims (2)

[Scope of utility model registration request] 1. A color-changing valve opening / closing device for selectively opening and closing a large number of color-changing valves provided in a multicolor coating device by control air, wherein air is supplied to both of two air input terminals (a, b). One air output terminal (s) only when is input
From the air output terminal, and when no air is input to one of the air input terminals (a), the air output terminal (s) is exhausted (e)
A plurality of air elements (M ₁ to
M ₉ ) are arranged vertically and horizontally, and are connected to the air elements of the columns in each column by a control air supply pipe for columns (E ₁ to E ₁ ).
E ₃ ) and a row control air supply pipe (E _{4 to} E ₆ ) connected to each row of air elements for each row are provided, and each of the air elements (M _{1 to} M ₉ ) is connected to each other. Each of the two air input terminals (a, b) is a control air supply pipe for columns (E _{1 to} E ₃ ).
And is connected to the row control air supply pipe _(E 4 _{~E 6),} an air output terminal of each of the air elements _{(M 1 ~M 9) (s} ) is connected to the color changing valve _(V 1 ~V ₉₎ An opening / closing device for the color change valve, which is characterized in that 2. Two air input terminals (a, b) are respectively connected to the column control air supply pipes (E _{1 to} E ₃ ) and the row control air supply pipes (E _{4 to} E ₆ ). In addition to the air elements (M _{1 to} M ₉ ), two air input terminals (a,
b) is a control air supply pipe for columns (E _{1 to} E ₃ )
Air elements (M _{10 to} M ₁₂ ) connected in series to
And an air element (M _{13 to} M ₁₅ ) in which both of the two air input terminals (a, b) are connected in series to the row control air supply pipes (E _{4 to} E ₆ ). is, the air output terminal (s) are switchgear color changing valve according to claim 1, characterized in that connected to the color changing valve (V ₁ ~V ₁₅₎ of each air elements (M ₁ ~M _15).