JP2648347B2 - Automatic coating equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic coating apparatus, and more particularly to an automatic coating apparatus capable of uniformly coating a relatively large surface to be coated.

Prior art and its problems The present inventor has disclosed Japanese Patent Application No. 60-293271 (Japanese Patent Application Laid-Open No. 62-1525).
No. 59) proposed an automatic coating device equipped with a reciprocating device operated by pressurized air and a moving device.

This automatic coating apparatus includes a spray gun, a reciprocating apparatus, and a moving apparatus that are operated by pressurized air.For example, the spray gun is reciprocated by the reciprocating apparatus, and the object to be coated is continuously moved upward by the moving apparatus. Moved in the direction.

If the moving speed of the spray gun and the moving speed of the object are not constant, the object is not uniformly coated.

Since the movement of the spray gun in the left-right direction is relatively fast, the speed can be relatively easily made constant even if an air-operated reciprocating device is used.

However, when a moving device operated by air is used, the speed at which the object is lifted is relatively low, and the load of the object needs to be lifted. It is difficult to make it.

For this reason, the inventor of the present invention has previously proposed that the cylinder device constituting the moving device be operated by hydraulic pressure in order to raise the object to be coated constantly (Japanese Patent Application No. 62-223045). Kaisho 64-67278))). According to the moving device according to this proposal, the object to be coated can be moved at a constant speed even at a low speed.

However, it has been found that there is a problem to be further improved.

That is, in the moving device of the automatic coating device proposed above, the working liquid is filled both above and below the piston of the cylinder device, and the working liquid is supplied from below or above from the hydroconverter, so that the piston becomes It can be moved up or down.

In such a moving device, if the room temperature is constant, the temperature rises or falls at a constant speed. However, when the room temperature changes, there is a problem that the moving speed changes.

The research by the present inventors has revealed that the reason why the moving speed changes with the change in room temperature is as follows.

In the previously proposed automatic coating apparatus moving apparatus, the first temperature is set between the first hydroconverter and the lower part of the cylinder apparatus so that the moving speed does not change according to the change in room temperature. A flow control valve with compensation is arranged, and a second flow control valve with temperature compensation is arranged between the second hydroconverter and the upper part of the cylinder device.

However, the flow control valve with temperature compensation allows a constant flow rate to pass even when the room temperature changes in one direction, for example, from the hydroconverter to the cylinder device, so that the viscosity of the working liquid changes. However, in the opposite direction, for example, from the cylinder device to the hydroconverter, the working fluid is not subjected to temperature compensation, and if the room temperature changes and the viscosity of the working fluid changes, the resistance changes. I do.

For this reason, for example, in the flow path for supplying the working liquid from the first hydroconverter to the lower part of the cylinder device via the first temperature-compensated flow control valve in order to raise the piston, the room temperature changes. Also,
It is possible to supply a substantially constant flow of working liquid to the lower part of the piston. However, in the flow path for supplying the working liquid to the hydroconverter from the upper part of the piston via the second temperature-compensated flow control valve, when the room temperature changes, the resistance changes, and a constant flow of the working liquid Can not be discharged.

Therefore, in the moving device proposed above, when the room temperature changes, the piston cannot be moved up or down at a constant speed.

Means for Solving the Problems According to the present invention, the problems as described above include: a spray gun, a reciprocating device for reciprocating the spray gun or the object to be coated in a substantially horizontal direction, and an object to be coated or the spray gun. An automatic coating apparatus comprising: a moving device that moves substantially vertically; the moving device comprising: a control valve communicating with a pressurized air source AC and the outside; a hydroconverter connected to the control valve; A temperature compensating flow control valve connected to the hydroconverter; and a cylinder device communicating with the temperature compensating flow control valve at a lower portion and communicating with a control valve at an upper portion. The hydroconverter is selectively connected to a source of pressurized air and the outside, and the upper part of the cylinder device is connected to the outside and the pressurized air. The problem is solved by providing an automatic coating apparatus characterized by selectively communicating with a source.

According to the present invention, the working liquid is supplied to the lower part of the cylinder device from the hydro converter via the flow control valve with temperature compensation. Therefore, even when the room temperature changes, the working liquid is supplied to the cylinder device at a substantially constant flow rate.

Air is discharged from the upper part of the cylinder device. The resistance of the discharged air varies depending on the room temperature, but this is slight, and since the flow rate of the working liquid supplied to the cylinder device does not substantially vary with the room temperature, the moving speed of the movable member of the cylinder device is kept constant. Will be maintained.

In this way, the object or the spray gun can be raised to a constant speed.

Next, a preferred embodiment of an automatic coating apparatus according to the present invention will be described with reference to FIG.

In this embodiment, a reciprocating device for moving the spray gun to the left and right in the horizontal direction and a moving device for moving the object to be coated vertically in the vertical direction are used. Instead, the movement of the spray gun and the movement of the object
The configuration may be reversed.

As shown in FIG. 1, an automatic coating apparatus according to this embodiment includes a spray gun 10, a reciprocating apparatus 12, and a moving apparatus 14.
And

The spray gun 10 sprays paint at a predetermined time according to a control signal from a control unit (not shown).

The reciprocating device 12 is controlled by, for example, pneumatic pressure, and moves the spray gun 12 in the left-right direction according to a control signal from a control unit.

The moving device 14 supports the work 15 so that the paint sprayed from the spray gun 12 hits the work 15 and moves the work 15 up and down according to a control signal. The movement of the spray gun 10 by the reciprocating device 12 and the movement of the object 15 by the moving device 14 cause the entire surface of the object 15 to be coated to be coated.

 The moving device 14 will be further described.

The moving device 14 is a control valve connected to a source of pressurized air AC.
16 and a hydroconverter 18 connected to the control valve 16
A flow control valve 22 with temperature compensation connected to the hydro converter 18, a cylinder device 20 connected to the flow control valve 22 with temperature compensation and the control valve 16, and an exhaust filter 24 connected to the control valve 16. Have.

When the control valve 16 receives the rising signal C + from the control unit (not shown), the control valve 16 enters the state shown in FIG.
And the hydro converter 18
The upper part of 20 and the exhaust filter 24 are communicated. When there is no rising signal C +, the control valve 16 allows the hydro converter 18 to communicate with the exhaust filter 24 and allows the pressurized air source AC to communicate with the upper portion of the cylinder device 20. This control valve 16 is
The supply of pressurized air to the upper part of the cylinder device 20 and the supply of pressurized air to the upper part of the cylinder device 20 are simultaneously controlled. Instead, a two-part control valve is used to
The two sections can also be configured to control the supply of pressurized air to the upper section of the hydroconverter 18 and the supply of pressurized air to the upper section of the cylinder device 20, respectively.

When the hydro converter 18 is communicated with the pressurized air source AC, the hydro converter 18 supplies a working liquid such as a working oil to a lower portion of the cylinder device 20 via a temperature-compensated flow control valve 22.

The flow control valve 22 with temperature compensation, for example,
A thin blade orifice is provided, and in the flow from the hydroconverter 18 to the cylinder device 20, even if the viscosity of the working liquid changes due to a change in room temperature, it acts to pass a constant flow rate. In the opposite direction, that is, in the direction from the cylinder device 20 to the hydroconverter 18, the working liquid does not undergo a temperature compensation action.

The cylinder device 20 includes a cylinder body 26 and a cylinder body.
The piston 26 includes a piston 28 that can move in the up and down direction, and a mounting table 32 installed on a piston rod 30 of the piston 28. By moving the piston 28 up and down,
The article 15 placed on the table 32 is moved up and down.

The working liquid is supplied from the hydro converter 18 to the lower side of the piston 28 of the cylinder device 20, and the pressurized air is supplied to the upper side of the piston 28 from the pressurized air source AC.

The exhaust filter 24 is controlled via the control valve 16.
It is selectively connected to the upper part of the hydroconverter 18 and the upper part of the cylinder body 26, whereby the exhaust air from these is discharged to the outside via the exhaust filter 24.

A speed control valve 34 is also provided between the control valve 16 and an upper part of the cylinder device 20. Thus, the flow rate of the air sent from the pressurized air source AC to the cylinder device 20 is adjusted to prevent abnormal lowering of the piston 28.

The automatic coating apparatus according to this embodiment operates as follows.

When a start switch (not shown) is turned on, the operation signal causes the reciprocating device 12 to operate.
This causes the spray gun 10 to reciprocate in the left-right direction. Further, during a predetermined period of the reciprocation, the spray gun 10 is operated to spray the paint.

When the start switch is turned on, the control valve 16 is further brought into the state shown in the figure by a rising signal C + from a control unit (not shown), and pressurized air is supplied from the pressurized air source AC to the hydro converter 18. It is supplied to the upper part, whereby the hydraulic converter 18 transfers the working liquid via the temperature-compensated flow control valve 22 to the cylinder device 20.
To the lower part of As a result, the piston 28 is raised, and the work 15 is raised. Air above the piston 28 of the cylinder device 20 is discharged to the outside via the control valve 16 and the exhaust filter 24.

In this way, the spray gun 10 is moved to the left and right, the paint is sprayed, and the object 15 is raised continuously, so that the entire surface of the object 15 is coated.

When the detection means (not shown) detects that the piston 28 has reached the uppermost position, the supply of the actuation signal and the rising signal C + is terminated.

Upon termination of the supply of the activation signal, the reciprocating device 12
Stop spray gun 10 in place and spray gun
Operation of 10 ends.

Upon completion of the supply of the rising signal C +, the control valve 16 shifts from the illustrated state to the other state, the pressurized air from the pressurized air source AC is supplied to the upper portion of the cylinder device 20, and the piston 28 is lowered. . The working liquid under the piston 28 is supplied to the hydroconverter 18 through the flow control valve 22 with temperature compensation, and is supplied to the hydroconverter 18.
Is discharged outside through the control valve 16 and the exhaust filter 24.

Effect As described above, according to the present invention, the object to be coated or the spray gun can be raised at a constant speed even when the room temperature changes.

[Brief description of the drawings]

FIG. 1 is a simplified diagram of an automatic coating apparatus according to a preferred embodiment of the present invention. 10 Spray gun 12 Reciprocating device 14 Moving device 15 Coating object 16 Control valve 18 Hydroconverter 20 Cylinder device 22 Flow control valve with temperature compensation 24 Exhaust filter 26 Cylinder body 28 Piston 32 Mounting table

Claims (1)

(57) [Claims] 1. An automatic coating system comprising a spray gun, a reciprocating device for reciprocating the spray gun or the object to be coated in a substantially horizontal direction, and a moving device for moving the object to be coated or the spray gun in a substantially vertical direction. In the apparatus, the moving device includes: a control valve communicating with the pressurized air source AC and the outside; a hydroconverter connected to the control valve; a flow control valve with temperature compensation connected to the hydroconverter; A cylinder device communicating with the flow control valve with temperature compensation at a lower portion and communicating with the control valve at an upper portion, wherein the control valve selectively connects the hydroconverter to a source of pressurized air and to the outside. An automatic coating device characterized in that the upper portion of the cylinder device is selectively communicated with the outside and a source of pressurized air. .