JPH0779986B2 - Method of controlling paint discharge rate of painting gun in painting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a method for controlling a paint discharge amount of a coating gun in a coating apparatus capable of making a coating film thickness as uniform as possible when coating a wall surface of a building or the like. Is.

[Prior art]

In reality, the current building is constructed as a very high-rise building, as represented by an office building, for example.

Construction of such high-rise buildings is steel frame assembly work,
All work, including concrete driving work, is dangerous and difficult because it is performed at a high place.

Particularly, since the painting work on the outer wall surface is a work on the outside of the building, it is more dangerous and difficult as compared with other work at height. Therefore, in order to overcome such dangers and difficulties,
Conventionally, there is a system in which after removing scaffolding from the building, a workbench (gondola) equipped with a coating device is hung along the wall surface, and the coating operator directly rides on this to perform the prescribed coating work. Although widely used, the coating device of such a system is one in which a worker directly mounts on a workbench such as a gondola, which replaces the scaffold, and performs a predetermined coating work. There is not much difference from the method of painting work while moving above.

Therefore, at present, various automatic coating devices have been developed to eliminate such danger.

However, in the conventional coating gun used in the automatic coating apparatus, the amount of coating material ejected from the coating gun is always a constant amount even though the moving speed is accelerated and decelerated at the left and right folding positions. It was Therefore, on the coated surface in the left and right acceleration / deceleration areas, the thickness of the coating film became extremely uneven, resulting in a very poor coating finish. Therefore, in order to eliminate such inconvenience, the above-mentioned automatic coating apparatus is, for example, Japanese Patent Application No. Sho 59-172776 (No. Sho 61-87560).
As in the invention, at the turning points on the left and right where the movement of the coating gun is accelerated and decelerated, for example, the discharge direction of the coating gun is shaken greatly outward so that unnecessary paint is not attached to the coating film forming surface. The reality is that

However, in such a case, it is possible to prevent the paint from unnecessarily adhering to the wall surface by shaking the paint gun to the outside, but by shaking the paint gun to the outside in a large direction, the paint is diffused. Minutes become mist and scatter into the atmosphere, which is a serious environmental problem.

In addition, the above method makes it uncertain how to move the coating gun, making it very difficult to clearly position the boundary of the coating, which makes it unsuitable for coating a wide range of walls. Met.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention is mounted on a movable workbench and reciprocates a coating gun left and right at a predetermined speed along a guide rail arranged to extend in the left-right direction of the workbench. In a coating device which is moved to coat a wall surface of a building or the like, the acceleration / deceleration area of the coating gun near both ends of the guide rail is detected by the detection means, and the acceleration / deceleration detected by the detection means is detected. By controlling the flow rate control valve provided in the paint supply path of the coating gun with a zone signal, the supply of the paint supplied to the coating gun is stopped, and a coating device that makes the coating wall thickness as uniform as possible is provided. An object of the present invention is to provide a method for controlling the amount of paint discharged from a coating gun.

Therefore, the discharge of the paint by the coating gun that has moved to the acceleration / deceleration area near the left and right ends of the guide rail is reliably stopped. Therefore, at the left and right ends of the painted area, the boundary between the painted part and the unpainted part can be clearly understood. Therefore, even if the wall surface of a large building is divided into a plurality of coating areas (left, right, top and bottom blocks) and coating is performed sequentially while moving the coating gun left and right in each of these coating areas, the continuous portion of each coating block Further, there is an effect unique to the invention of the present application such that coating is never overlaid, and therefore uniform coating treatment can be performed without unevenness in the film thickness.

〔Example〕

An embodiment of a paint discharge amount control method for a coating apparatus according to the present invention will be described in detail below with reference to FIGS. 1 to 4.

In FIG. 1, reference numeral 1 denotes an aerial work vehicle. A turntable 3 is rotatably provided on the aerial work vehicle 1 via a turning ring 2, and the turntable 3 is undulated by a hoisting cylinder. The telescopic boom 4 is attached along the longitudinal direction of the boom by a telescopic cylinder incorporated therein. At the tip of the telescopic boom 4, a workbench 5 whose structure is shown in detail in FIG. 2 (described in this embodiment as being equipped with a coating device) is swingably mounted and held in a balanced manner. .

FIG. 2 is a view for explaining a concrete structure of the workbench 5 attached to the tip of the telescopic boom 4 as seen from the front.

The workbench 5 is configured with a horizontally long rectangular frame 5c in which guide rails 5a and 5b are arranged in parallel vertically as a skeleton. The frame 5c straddles both the guide rails 5a and 5b to form a frame 6
Are reciprocally movable to the left and right. That is, the frame 6 can run by guiding the plurality of guides 6a ... to the guide rails 5a and 5b, and the frame 6 has a vertically long fitting hole 6b. The fittings 6b are provided at the four corners of the fitting hole 6b.
The slider 6d with is arranged so that it can slide up and down.

Further, coating guns (arranged on the left and right in this embodiment) 7a and 7b are attached above the frame 6, and the coating guns are provided.
7a and 7b are moved between the drive sprocket 8a arranged on one side in the longitudinal direction (left side in this embodiment) inside the frame 5c and the driven sprocket 8b arranged on the other side in the longitudinal direction (right side in this embodiment). By running the chain 8c wound around, the frame 6 reciprocates left and right to be moved.

In the figure, 9 is a balance weight of the chain 8c, 10,
Reference numeral 10 is a proximity sensor which constitutes a detecting means for detecting the limit of both ends of the left and right reciprocating motion of the frame 6.

FIG. 3 shows a control circuit for supplying paint to the coating guns 7a and 7b mounted on the workbench 5.

In the figure, 11 is an air compressor, 12 is an electromagnetic air check valve (AND circuit), 13 is a flow rate control valve for controlling the flow rate of the paint supplied to the coating guns 7a and 7b, 14 is a paint supply path, and 15 is This is an electromagnetic relay, and this electromagnetic relay 15 is a timer 16 that operates by turning on and off the proximity sensor 10.
The relay contact 15a is turned off when the contact 16a is turned on, and the relay contact 15a is turned on when the contact 16a of the timer 16 is turned off. 17 is a power supply.

Hereinafter, the method for controlling the coating material discharge amount of the coating gun in the coating apparatus according to the present invention will be described in detail with reference to the above embodiments.

First, the aerial work vehicle 1 is moved to a target work place.
Then, after completely fixing, the turntable 3 is swung in a predetermined wall surface direction to bring the telescopic boom 4 closer to the wall surface A (see FIG. 4) to be coated and to be extended and attached to the tip. The table 5 is opposed to the wall surface A to be coated.

It should be noted that the above-mentioned various operations are accurately performed by a well-known control device installed in the aerial work vehicle 1.

Then, as described above, the workbench 5 has the predetermined wall surface A to be coated.
When set to the front of, the painting guns 7a and 7b are given conditions for starting painting. The painting gun 7a at this point,
The position of 7b is, for example, at a position where the proximity sensor 10 on the left side of FIG. 2 detects the coating guns 7a and 7b, and therefore the control circuit includes a timer 16 connected in series with the proximity sensor 10.
Is in the operating state, and the contact 16a is turned on. Therefore, the electromagnetic relay 15 connected in series with the contact 16a enters the operating state, the relay contact 15a is turned off, and the electromagnetic air check valve 12 is closed. Therefore, both of the painting guns 7
The discharge of paint from a and 7b is stopped. In this state, both coating guns 7a, 7b are at the coating start position toward the right side.

The set times of the electromagnetic relay 15 shown in Fig. 3 have passed since the above conditions were satisfied (this set time is for both painting guns 7
a and 7b are close to the left and right ends and are satisfied by the setting condition of the timer 16 set in consideration of the timing of acceleration / deceleration).
By setting to FF, the relay contact 15a is turned on and the electromagnetic air check valve 12 is opened. Therefore, the flow control valve 13 is opened, and the predetermined coating material is discharged from both the coating guns 7a and 7b.

When both of the coating guns 7a, 7b approach the right proximity sensor 10 by the above-mentioned rightward movement, the proximity sensor 10 detects this and reactivates the electromagnetic relay 15, and the electromagnetic air check valve 12 To shut off. Therefore, the flow control valve 13 is also closed again to stop the paint discharge.

By repeating the reciprocating motion of the coating guns 7a, 7b, for example, a plurality of coating steps shown by an arrow B in FIG. 4 are obtained, and the desired complete coating work of the wall surface A to be coated is completed. .

That is, according to the above-mentioned embodiment, the discharge of the paint from both coating guns 7a and 7b is completely stopped in the traveling range where the traveling speed is accelerated and decelerated at both ends of the reciprocating movement of both coating guns 7a and 7b. Therefore, unnecessary coating of the paint as seen in the conventional automatic coating apparatus is not seen, and therefore the formation of a non-uniform coating film is eliminated and a uniform coating film can be formed. Further, since the coating area becomes clear, numerical control of a predetermined coating pattern and the like becomes very easy and the working efficiency is significantly improved.

〔The invention's effect〕

As described above, according to the present invention, the coating gun is reciprocally moved left and right at a predetermined speed along a guide rail that is mounted on a movable work table and is arranged to extend in the left-right direction of the work table. In a coating device for coating a wall surface of a building or the like, the acceleration / deceleration area of the coating gun near both ends of the guide rail is detected by the detection means, and the acceleration / deceleration area signal detected by the detection means is detected. By controlling the flow control valve provided in the paint supply path of the coating gun, the supply of the paint supplied to the coating gun is stopped, and the coating gun paint is discharged so that the coating wall thickness is as uniform as possible. Since it provides a quantity control method,
The discharge of paint by the coating gun that has moved to the acceleration / deceleration area near the left and right ends of the guide rail is reliably stopped. Therefore, at the left and right ends of the painted area, the boundary between the painted part and the unpainted part can be clearly understood. Therefore, even if the wall surface of a large building is divided into a plurality of coating areas (left, right, top and bottom blocks) and coating is performed sequentially while moving the coating gun left and right in each of these coating areas, the continuous portion of each coating block Further, since it is never applied repeatedly, a uniform coating process can be performed without unevenness in the film thickness, and since the paint is not unnecessarily diffused, it has excellent effects such as being environmentally friendly.

[Brief description of drawings]

FIG. 1 is a side view of an entire aerial work vehicle that adopts the paint discharge amount control method of the coating apparatus according to the present invention, and FIG. 2 is the reciprocating motion of a coating gun that adopts the paint discharge amount control method of the same coating device. Fig. 3 is a front view showing the mechanism, Fig. 3 is a control circuit diagram for intermittently discharging paint from the coating gun of the same coating device, and Fig. 4 is coating by a coating gun adopting the paint discharge amount control method of the same coating device. It is explanatory drawing which shows a range. 1 ... Aerial work vehicle, 2 ... Swivel ring, 3 ... Turntable, 4 ... Telescopic boom, 5 ... Workbench (in this embodiment, description is made assuming that a coating device is mounted), 5a, 5b ... … Guide rail, 5c …… Frame, 6 …… Frame, 6a …… Guide element, 6b …… Fitting hole, 6c …… Guide element, 6b …… Slider,
7a, 7b ... Painting guns (in this embodiment, arranged on the left and right), 8a ...
… Drive sprocket, 8b …… Driven sprocket, 8c ……
Chain, 9 ... Balance weight, 10 ... Proximity sensor (detection means), 11 ... Air compressor, 12 ...
Electromagnetic air check valve (AND circuit), 13 ... Flow control valve, 14 ... Paint supply path, 15 ... Electromagnetic relay, 15a ... Relay contact, 16 ... Timer, 16a ... Contact, 17 ... Power supply.

Claims (1)

[Claims] 1. A wall surface of a building or the like, which is mounted on a movable workbench and reciprocally moves a coating gun left and right at a predetermined speed along a guide rail extending in the left-right direction of the workbench. In a coating device adapted to perform coating, the acceleration / deceleration area of the coating gun near both ends of the guide rail is detected by a detection means, and the coating material of the coating gun is detected by the acceleration / deceleration area signal detected by the detection means. By controlling the flow control valve provided in the supply path, the supply of paint supplied to the coating gun is stopped, so that the coating wall thickness is made as uniform as possible. Control method of paint discharge rate of coating gun.