JP2608849B2 - Spray gun for painting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray gun for painting, in which a valve rod for controlling the presence or absence of spraying of paint by opening and closing a valve port formed in a paint passage is driven by an air cylinder or the like. The present invention relates to a spray gun for painting in which the packing of the sliding portion of the rod can be replaced easily and quickly.

[0002]

2. Description of the Related Art In a conventional spray gun for painting, a valve rod and a drive unit such as a piston of an air cylinder are connected by a rod that passes through the inside of the valve body. Requires a disassembly from the drive, which is complicated and takes a long time. In particular, when the spray gun is attached to the robot, it can be attached to the robot arm at the rear of the gun body with the drive unit, so it is necessary to remove the spray gun from the robot arm when replacing the packing. In painting, it was necessary to stop the line for a long time.

[0003]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to make it possible to easily and quickly replace the parts of the sliding part of a valve rod such as a packing.

[0004]

As a means for solving the above SL problems SUMMARY OF THE INVENTION, together with a first aspect of the invention to expose the rod by cutting a part of the gun body, the rod and the valve杆側driver Divided to the side and the connecting rod can be detached in the meantime
The structure is such that they are separably connected by interposing them, and the invention of claim 2 has both ends of the connecting rod having elasticity.
The third aspect of the present invention is a packing for sealing a valve rod.
The unit is made into a unit, and it is detachably screwed onto the gun body.
did.

[0005]

According to the present invention having the above-mentioned structure, the rod connecting the valve rod and the drive unit is exposed and divided, and in between.
The connecting rod is detachably connected to the valve rod so that it can be detached.When replacing parts of the sliding part of the valve rod such as packing, the rod is separated by removing the connecting rod and only the valve rod side is removed. very easily and quickly can be carried out because it permanently, also, the ends of the connecting rod
The locking part has elasticity so it can be easily attached and detached and accidentally come off
And the packing is unitized and the gun
Replacement is easy because it is screwed to the main body.

[0006]

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

In the figure, reference numeral 1 is a gun body made of synthetic resin, and a high voltage is applied to a nozzle 3 by a high voltage generator 2 embedded therein.

A paint reservoir 4 for temporarily storing paint supplied from a paint passage (not shown) drilled from the rear end portion is formed at the upper front end side of the gun body 1. A valve seat 6 having a port 5 is provided, and the valve port 5 communicates with the nozzle 3 through a paint passage 7.

A valve rod 8 is disposed at the valve port 5 so that the tip of the valve rod 8 can come and go.
Thus, it is tightly and slidably held.

The packing unit 9 is shown in FIGS.
As shown in detail, a case 10, a first packing 11,
Second packing 12, O-ring 13 and packing retainer 1
4, the first packing 11, the second packing 12, and the O-ring 13 are housed in the case 10 and integrated by the packing retainer 14 press-fitted into the case 10.

A notch 15 is formed at the upper center of the gun body 1, a device hole 17 reaching the paint reservoir 4 is formed at the front end face thereof, and a female screw 18 is formed at the entrance thereof, and a packing unit is formed. 9 is packing holder 1
The male screw 16 formed at 4 is screwed and fixed to the female screw 18.

The valve rod 8 is slidably fitted in the packing retainer 14 and has a rear end projecting into the notch 15.
9 are integrally connected.

An air cylinder 21 in which a piston 23 is slidably fitted in a cylinder 22 at the rear end of the gun body 1.
The piston 23 is urged leftward in FIG. 1 by the elastic force of the coil spring 25, and moves rightward when pressurized air is supplied from the through hole 24. No. 23 has a second end with a tip protruding into the notch 15.
Rod 26 is connected.

Flanges 20 and 27 are formed at corresponding ends of the first rod 19 and the second rod 26, respectively, and connecting rods 28 having elastic locking portions 29 and 29 formed at both ends are provided with elastic locking portions. The first rod 19 and the second rod 26 are connected by locking 29, 29 to the collars 20, 27. The elastic locking portions 29, 29 are elastically deformed so that the flanges 20, 2,
It can be freely attached and detached.

The gun body 1 is covered with a cover 30 to prevent the paint mist from entering the notch 15.

This embodiment has the above structure, and the piston 23
When pressurized air is supplied into the cylinder 22 through the through hole 24 of the piston 23 and the piston 23 moves to the right in FIG. 1 against the elastic force of the coil spring 25, the first rod 19, the second rod 26 and the connecting rod 28 together The valve rod 8 moves in the same direction, separates from the valve seat 6, opens the valve port 5, and the paint supplied to the paint reservoir 4 is ejected from the nozzle 3 in the form of a mist through the passage 7 and at the same time a high voltage is generated. Since the nozzle 3 has a high voltage by the heater 2, the mist paint is charged and sucked by the object to be coated.
When the air in the cylinder 22 is discharged from the through hole 24, the piston 23 moves leftward in FIG. 1 due to the elasticity of the coil spring 25, the valve rod 8 also moves in the same direction, and the valve opening 5 closes. The ejection of the paint from the nozzle 3 stops.

In this manner, when the opening and closing of the valve hole 5 is repeated, the first packing 11 and the second packing 11 of the packing unit 9 are repeated.
Since the packing 12 is rubbed and worn by the valve rod 8 and the paint leaks toward the notch 15, the packing unit 9 needs to be replaced.

In this case, the cover 30 is removed, and the connecting rod 28 is pulled to remove the elastic locking portions 29, 29 from the first and second rods 19, 26 while causing elastic deformation. Is removed from the packing unit 9 together with the first rod 19, and the packing retainer 14 is rotated to remove the packing unit 9 from the gun body 1.

Then, a new packing unit 9 is mounted on the gun body 1, the valve rod 8 is inserted into the packing unit 9 together with the first rod 19, and the elastic locking portions 29, 29 are connected while being elastically deformed. Rod 28 to first rod 1
9 and the second rod 26.

In this embodiment, the first rod 19 and the second rod 26 are separably connected by a connecting rod 28 having elastic locking portions 29 at both ends, but the connecting rod 28 is connected to the first rod 19 by a split pin or the like. It may be connected to the second rod 26.

The present invention is not limited to the automatic electrostatic coating gun shown in the above embodiment, but can be widely applied to other types of coating guns.

[Brief description of the drawings]

FIG. 1 is a sectional view of one embodiment of the present invention.

FIG. 2 is an exploded sectional view of a packing unit.

FIG. 3 is a sectional view of a packing unit.

[Explanation of symbols]

 1: Gun body 4: Paint pool 5: Valve port 8: Valve rod 9: Packing unit 11: First packing 12: Second packing 15: Notch 19: First rod 21: Air cylinder 23: Piston 26: Second Rod 28: Connection rod 29: Elastic locking part

Claims (3)

(57) [Claims] 1. A a valve port provided on the paint passage formed in the gun body, the paint spray gun which is connected to the piston of the air cylinder via a rod a valve rod for opening and closing apart against the valve opening, the cancer A part of the main body is cut off to expose the rod, and the rod is divided into the valve rod side and the drive section side, and a connecting rod is detachably interposed therebetween.
A spray gun for painting, characterized by connecting the two so that they can be separated. 2. The locking portions at both ends of the connecting rod have elasticity.
The spray for coating according to claim 1, characterized in that the spray for coating is provided.
gun. 3. A packing for sealing the valve rod is a unit.
It is characterized by being screwed to the gun body freely
The spray gun for coating according to claim 1 or 2, wherein