JPH10393A - Automatic coating gun - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to use two-pack type coating materials of an external mixing system by providing a coating gun with plural opening/closing controllers which separately open and close plural stop valves separately connected to plural nozzles and plural coating material supplying devices which separately supply the coating materials to the plural stop valves. SOLUTION: A gun body 1 is internally provided with the first stop valve 11 connected to the first nozzle 10 and the second stop valve 21 connected to the second nozzle 20. These valves have the same structure. The first stop valve 11 and the second stop valve 27 are separately opened and closed by separately switching a first selector valve 17 and a second selector valve 27. The same or different coating materials separately stored in a first coating material tank 15 and a second coating material tank 25 are then forcibly fed by a first pump 14 and a second pump 24 and are separately discharged from the first nozzle 10 and the second nozzle 20 or the discharge is stopped; further, the secondary pressures of a first regulator 13 and a second regulator 23 are arbitrary set and the discharge rates of the coating materials from the first nozzle 10 and the second nozzle 10 are separately controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic coating gun in which a plurality of nozzles are provided at the tip of a gun body and a paint opening / closing valve is provided in the gun body.

[0002]

2. Description of the Related Art Conventionally, when a plurality of automatic coating guns are installed close to each other, an automatic coating gun having a plurality of nozzles at the tip of a gun body has been used. As compared with the automatic coating gun, the coating particles were made finer to form a smooth coating film, and the discharge amount was increased to improve the productivity.

[0003]

However, in the prior art, since there is only one on-off valve for controlling the discharge of paint and one device for supplying paint to the on-off valve, paint discharged from a plurality of nozzles is not provided. It was the same, and the ratio of the ejection amount was constant and could not be adjusted, and the ejection and its stop could not be performed separately.

[0004]

Means, functions and effects for solving the problems.
As a means for solving such a problem, the invention of
A plurality of on-off valves separately connected to a plurality of nozzles in the gun body, a plurality of on-off control devices for separately opening and closing the plurality of on-off valves, and a plurality of supplies of paint separately to the plurality of on-off valves The paint supply device is provided, and different paints are discharged from a plurality of nozzles, the discharge amount is separately controlled, and the discharge and the stop can be performed separately, so that the main agent and the curing agent are hardened. It can be used for externally mixed two-pack type paints that mix and cure after discharging the agent from separate nozzles, and for deeply coated objects, use one nozzle to apply the paint over the entire surface By spraying the paint only on the back part with the other nozzle, the back part where the amount of paint applied is reduced with one nozzle can be uniformly coated with the front part, and in the case of electrostatic coating, it can be coated with the front part. Painted The so-called picture frame phenomenon in which paint concentrates on the edge may occur, but in such a case, the paint is sprayed on the entire surface with one nozzle and the paint is sprayed only on the center with the other nozzle. It is possible to paint the entire surface evenly, furthermore, it is easier to change colors by discharging different paints from multiple nozzles, and furthermore, clogging of one nozzle, defective seat of open / close valve, regulator and When the paint pump is out of order, the paint can be continued with only the other nozzle.

According to a second aspect of the present invention, in the first aspect of the present invention, a high voltage generator or a high voltage cable is disposed at the center of the gun body, and two paint passages and two
Since two control air passages for separately controlling the two on-off valves are arranged at symmetrical positions, the distance from the high voltage generator or the high voltage cable to the electrodes provided on the two nozzles in the electrostatic automatic coating gun. Has the effect of reducing the electrostatic capacity and improving the safety, and has the effect of shortening the distance from the on-off valve to the nozzle and shortening the cleaning time.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a gun body, and a first nozzle 10 and a second nozzle 20 are fixed to the tip of the gun body 1 so as to be directed slightly inward to discharge paint. A first opening / closing valve 11 connected to the first nozzle 10 and a second opening / closing valve 21 connected to the second nozzle 20 are housed.

The first on-off valve 11 and the second on-off valve 21 have the same structure, and a rod protruding into the paint chamber 9 through the partition 8 to the piston 4 slidably fitted in the cylinder chamber 2. The valve body 6 fixed to the distal end of the rod 5 is pressed against the seat surface 7 by the elastic force of the coil spring 3 to close the valve, and the first and second valves are placed on the partition wall 8 side of the cylinder chamber 2. The supply of the pressurized air from the pressurized air supply pipes 16 and 26 causes the valve body 6 to retract and open together with the piston 4.

Reference numerals 12 and 22 denote first and second paint supply pipes connected to the paint chamber 9 of the first on-off valve 11 and the second on-off valve 21, respectively. 1
3, the first pump 14 and the first paint tank 15 are sequentially connected, and the second paint supply pipe 22 has a second regulator 23,
The second pump 24 and the second paint tank 25 are sequentially connected.

A first switching valve 17 and a first compressed air supply source 18 are connected to the first compressed air supply pipe 16, and a second switching valve 27 and a second switching valve 27 are connected to the second compressed air supply pipe 26. A pressurized air supply 28 is connected.

In this embodiment, the first switching valve 17 and the second switching valve 27 are separately switched so that the first switching valve 11 and the second switching valve 21 are opened and closed separately. The same or different paints separately stored in the paint tank 15 and the second paint tank 25 are pumped by the first pump 14 and the second pump 24, and the first nozzle 10 and the second nozzle 2
0, or the discharge is stopped, and the secondary pressure of the first regulator 13 and the second regulator 23 is arbitrarily set so that the paint from the first nozzle 10 and the second nozzle 20 is discharged. The discharge amount can be controlled separately.

Incidentally, the first regulator 13 and the second regulator 23 are removed, and the first pump 14 and the second pump 2 are removed.
The discharge amount may be controlled by using a positive displacement pump such as a gear pump and controlling the rotation speed of the pump.

Although the present embodiment relates to an airless spray gun, the present invention can be applied to other automatic coating guns such as an air spray gun or an electrostatic spray gun.

FIG. 2 is a sectional view of the gun body 1, in which a high voltage generator 30 is disposed at the center of the gun body 1 and two paint passages 31 and two on-off valves are separately controlled therearound. And the two control air passages 32 are arranged at symmetrical positions. In the electrostatic automatic coating gun, the distance from the high voltage generator 30 to the electrodes provided on the two nozzles 10 and 20 is the shortest, The capacitance is reduced and safety is improved, and the distance between the on-off valves 11 and 21 and the nozzles 10 and 20 is minimized, thereby shortening the cleaning time.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an outline of an embodiment of the present invention.

FIG. 2 is a sectional view of a gun body.

[Explanation of symbols]

 1: Gun body 10, 20: First and second nozzles 11, 21: First and second on-off valves 12, 22: First and second paint supply pipes 13, 23: First and second Regulators 14, 24: first and second pumps 15, 25: first and second paint tanks 16, 26: first and second pressurized air supply pipes 17, 27: first and second switching Valves 18, 28: first and second pressurized air supply sources 30: high voltage generator 31: paint passage 32: control air passage

Claims (2)

[Claims] A plurality of nozzles are provided at a tip of a gun body,
In an automatic coating gun provided with a paint on-off valve in the gun body, a plurality of on-off valves separately connected to the plurality of nozzles are provided in the gun body, and a plurality of on-off valves are separately opened and closed. An automatic coating gun, comprising: an opening / closing control device, and a plurality of paint supply devices for separately supplying paint to the plurality of on / off valves. 2. A high voltage generator or a high voltage cable is disposed at the center of the gun body, and two paint passages and a control air passage for separately controlling the two on-off valves are symmetrically disposed around the high voltage generator or the high voltage cable. The automatic coating gun according to claim 1, wherein the gun is disposed at a position.