JPS59193167A - Controlling method of spray gun - Google Patents

Abstract

PURPOSE:To prevent uneven painting and wasteful painting in various kinds of painting by making the rotating and driving part of a spray gun controllable by an encoder device. CONSTITUTION:A main rotary shaft 25 is suspended freely rotatable from a main bearing 24 on the frame 23 on a conveyor 22 carrying a material W to be painted. A dust collecting box 27 contg. an encoder part 26 is successively provided to said shaft 25 on the axial line thereof. The shaft 25 is made freely drivable at varying speeds by means of a speed changer 27 for driving the main shaft on the frame 23, chain wheels 29, 30 and a chain 31. The rotating speed and direction of the shaft 25 are made freely controllable by the encoder part 26. Painting is thus accomplished uniformly without unevenness at adequate revolutions.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention is based on a coating method in which a spray gun rotates, and a pulse generator and an encoder (
Encoding) device allows you to freely control the rotation direction, rotation speed, paint spray/stop, spray height, angle, etc. of the spray gun, resulting in even, uniform coating, saving on paint, and leaving even uneven surfaces unpainted. The present invention relates to a method of controlling a spray gun in a rotary coating method for the purpose of coating without coating.

Various conventional rotary coating methods are known, but the most common one is the spray gun equipped with a heavy rotation type auto spray gun using a planetary gear, as shown in Japanese Patent Publication No. 53-19332 (19332-1933). (See Fig. 1), which is a rotary joint attached to the tip of a radiant shaft 5 that is attached radially from a bearing 4 at the lower end of a main shaft 3 that hangs freely from the center of a sun gear 2 fixed to a booth L. An auto spray gun 8 is attached to the lower end of the rotating shaft 7 supported perpendicularly to the main shaft 3, and a planetary gear 11 supported on a bearing 1o provided at the outer end of the collar 9 provided on the upper part of the main shaft 3 is meshed with the sun gear 2. The planetary gear +1 and the rotating shaft 7 are connected via the universal joint 12 and the connecting rod 13, so that the auto spray gun 8 is caused to move planetarily by the rotation of the main shaft 3, so that the rotation trajectory 14 as shown in FIG. It is something that depicts. Such a rotation trajectory 1
4, the rotation ratio between the revolution and rotation of the planetary gear is constant, so there is no degree of freedom in adjustment, and unevenness like the striped pattern 16 that appears on the simulation trajectory 15 shown in Fig. 3 occurs. Uniform coating becomes difficult.

In FIG. 2, 17 indicates a revolution locus, 18 indicates an autorotation trajectory, and 19 indicates an injection direction. In FIG. 3, 2o indicates a belt conveyor, and 21 indicates a waste coating portion.

The object of the present invention is to solve these problems and to prevent uneven coating such as striped patterns even in the case of various coatings, and to prevent unnecessary coating.

The basic explanation of this invention is that the rotating part ia of the spray gun
A pulse generator and an encoder device installed in each section determine the revolution of the spray gun, the direction of rotation,
The rotation speed, paint spray, spray height, angle, etc. can be freely controlled.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In this embodiment, as shown in FIGS. 4 to 6, a main bearing 24 is mounted on a frame 23 installed over a conveyor 22 carrying objects W to be coated and traveling in the direction of an arrow P in a speed-adjustable manner. A main rotary shaft 25 is installed vertically so as to be freely rotatable, and a current collecting box 27 having a built-in encoder part 26 is connected to the main rotary shaft 25 on the axis, and is connected to the main shaft drive gearbox 28 provided on the frame 23. The main rotary shaft 25 can be driven at variable speeds via the wheels 29, 30 and the chino 31, and the rotational speed and direction of the main rotary shaft 25 can be freely controlled by the encoder part 26.

A plurality of sub rotary shafts Ili [1133] are vertically rotatably mounted on the outer end of the rotary plate 32 attached to the lower end of the main rotary shaft 25, and these sub rotary shafts 33 correspond to each other on the rotary plate 32. auxiliary rotary drive transmission 34 and another encoder part 35 and chain wheel 36, provided as
37, and each of the spray guns 4o is attached to the lower end of a spray gun attachment rod 39, which is suspended vertically from both ends of a spray gun attachment beam 38 attached to the lower end of each of these sub rotary shafts 33, and is vertically adjustable. The rotation speed, rotation direction, paint injection/stop, and injection height and angle can be controlled at will.

In Figure 5, 41 is an electric pole for power supply, 42 is a paint pipe for paint supply, 43 is a compressed air pipe for compressed air supply, 44 is a valve for operating the spray gun, and 45 in Figure 6 is an exhaust fan. , 46 indicates a mist separator.

As shown in Fig. m1, when the conveyor 22 travels at a speed V, the rotation (revolution) speed R of the main rotary shaft 25 and the rotation (rotation) speed r of the auxiliary rotary shaft 33 are determined by the encoder part 2.
If the adjustment of 6.3 seconds is properly controlled, the center portion 48 becomes uniform as shown in the simulation locus 47 shown in FIG. In other words, uniform coating is possible by freely adjusting a part of the encoder.

Furthermore, the simulation locus 49 shown in FIG. 8 shows that not only the center part 48 is uniform, but also the both sides 50 (see FIG. 7), which are slightly inward from both side edges of the conveyor 22 and outside the actual coating range, are sprayed. (cut when the stop command is issued), so there is no wasted air.

Furthermore, in the simulation trajectory 51 shown in FIG. 9, areas other than the painting required area 52 of the arbitrarily shaped object (automobile wheel) W in the center portion 48 are cut by the instruction to stop injection, so there is no waste in this case as well. Doesn't blow.

In this example, the spray gun heavy rotation type painting was described, but rotation control is performed in the same way when the spray gun moves back and forth while rotating, and when the spray gun rotates (rotates) at a fixed position. be able to.

Since the present invention has the above configuration, it has the following advantages.

(1) When painting with a heavy rotation spray gun, the rotational speed and direction of revolution and rotation can be freely adjusted. That is, since the rotation ratio can be changed freely, an appropriate rotation (revolution/rotation) can be selected for the running speed of the conveyor, and uniform coating without unevenness can be easily achieved.

(2) Simple painting is possible by stopping rotation and only revolving.
Conversely, it is also possible to stop the revolution and only rotate on the axis for partial painting.

(3) Since the direction of rotation of the spray gun can be freely controlled, uneven surfaces can be painted evenly.

(4) Since the control for spraying and stopping can be done freely, it is possible to cut out parts that do not need to be painted, so there is no wasted spraying, and the parts that do not need to be painted can be cut slightly inward from both sides of the conveyor. The savings effect is extremely large.

(5) Since it is possible to paint only the area that requires painting in an arbitrary shape, the effect of saving paint is significant.

[Brief explanation of drawings]

Figure 1 is a front view of the route of the main parts of the conventional technology, Figure 2 is the same,
Rotation @ trace, Fig. 3 is a simulation trajectory diagram resulting in uneven jetting, Fig. 4 is a route plan of the device according to the present invention, Fig. 5
The figure is a front view of the route, FIG. 6 is a side view of the route, and FIGS. 7 to 9 are various simulation locus diagrams according to the present invention. (Explanation of symbols of main parts) 22...Conveyor 25...Main rotary beam shaft 26...Part of encoder (main shaft) 27...Current box 28...Main shaft drive Transmission 32... Rotating plate 33... Sub rotary shaft 34... Sub rotary shaft drive transmission 35... Encoder part (sub shaft) 40... Spray gun 47... ...Simulation a trace 52...Required painting area Fig. 5 Fig. 6

Claims (3)

[Claims] (1) A method for controlling a spray gun in a rotary coating method, which comprises controlling the rotation direction, rotation speed, paint injection/stop, spray height, angle, etc. of the spray gun using an encoder provided on the rotating part. (2) In the spray gun reciprocating m-type auto spray device, the rotary drive parts provided in the main rotating part and the auxiliary moving part are controlled by an encoder provided in the rotating part, according to claim 1. How to control a spray gun. (3) In the spray gun reciprocating m-type auto spray device, the spray gun control method according to claim 1, characterized in that the rotation drive section of each spray gun is controlled by an encoder provided in each rotation section. .