JPS63360Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coating gun, and particularly to a coating gun suitable for use in a coating device that applies two or more types of liquids.

2. Description of the Related Art Conventionally, a coating device having a structure shown in FIG. 1 is known as a coating device for coating two or more types of liquids (for example, paints).

This coating device includes two liquid supply means 1 for individually pressurizing and sending out two types of liquids A and B;
2 and a cleaning liquid supply means 3 for pressurizing and sending out the cleaning liquid C are connected to a single painting gun 5 via a switching valve 4, and both liquids can be supplied by operating the switching valve 4. By selectively communicating the means 1 and 2 with the coating gun 5, the two types of liquids A and B are applied individually.

However, in this technique, since there is only one liquid supply path from the switching valve 4 to the coating gun 5, prior to switching the liquid to be applied, the liquid from the switching valve 4 to the coating gun 5 is It is necessary to send the cleaning liquid C into the supply path to clean the inside of the liquid supply path and remove the liquid remaining in this path.

This operation must be performed every time the liquid is changed, which causes problems such as the painting process becoming complicated and taking a long time. This causes problems such as an increase in cost and the need for additional equipment.

On the other hand, as a method for solving the above-mentioned problems, two painting guns 5 are provided in parallel, and liquid supply means 1 and 2 are connected to each of these painting guns 5 to create two systems. It is conceivable that the cleaning operation can be omitted by providing an independent liquid supply path.

However, even with this method, the painting gun 5 becomes large in size, making it difficult to insert the painting gun 5 into a narrow area, and as a result, it becomes impossible to paint the narrow area. When painting two surfaces that intersect in a particularly narrow area, the inclination of the paint gun 5 is limited, making it difficult for each discharge hole of the paint gun 5 to reach the surface to be painted. cannot be faced.

The present invention was proposed in consideration of the above-mentioned conventional circumstances, and its purpose is to form two liquid supply channels coaxially by using a double pipe structure. By intersecting the spray heads provided on each side, we have created a painting gun that can apply two types of liquids separately while minimizing the size of the gun, making it easier to apply to two intersecting surfaces in narrow areas. It is about providing.

The present invention will be explained below based on an embodiment shown in FIG.

The coating gun 6 shown in this embodiment has a first supply path 7
A second pipe 8 forming a second liquid supply path 8a is provided on the outside of the first pipe 7 forming the first pipe 7 along the outer periphery of the first pipe 7. The tip of the tube 7 is provided with a first spray head 9 for discharging the liquid A sent into the first liquid supply path 7a to the outside, and the outer wall of the second tube 8 is provided with the second
A second spray head 10 is provided to intersect the axis of the first pipe 7 and discharge the liquid B fed into the liquid supply path 8a to the outside.
The basic configuration includes valve devices 11 and 12 provided at the base ends of the tubes 7 and 8, respectively, for controlling the flow of the liquids A and B supplied to the respective liquid supply paths.

Next, to explain these details, the first pipe 7 is formed in a cylindrical shape, and a hollow portion extending over the entire length inside thereof is the first liquid supply path 7a.
It is said that Further, a threaded portion 7b is formed on the outer periphery of the tip (upper part in FIG. 2) of the first tube 7, and a nozzle 12 having a discharge hole 12a is fitted into the opening at the tip. This nozzle 1
2 is a nozzle nut 1 that is screwed into the screw portion 7b.
3 and is pressed against the distal end surface of the first tube 7, thereby being fixed to the first tube 7.

The tip of the first tube 7 is a nozzle 12.
The first spray head 9 is constituted by the nozzle nut 13 and the nozzle nut 13.

The second tube 8 has an inner diameter larger than the outer diameter of the first tube 7 and is shorter than the first tube 7 . The second liquid supply is arranged concentrically on the outside and fixed to the outer wall of the first tube 7 with both ends closed, and is annular along the outer periphery of the first tube 7. It is adapted to form a passage 8a. Further, communication holes 14 and 15 are formed in the side wall of the second tube 8 at its distal end and proximal end.
And the second spray head 10 is attached to the tip thereof.
is provided.

The spray head 10 includes a nozzle holder 16 which is integrally fixed to the outer wall of the second tube 8 and projects in the radial direction, and has a communication hole 16a that communicates with the communication hole 14 on the tip side.
The nozzle 17 is fitted into the projecting end of the nozzle holder 16 and has a discharge hole 17a, and the nozzle nut 18 is configured to press and fix the nozzle 17 against the projecting end of the nozzle holder 16.

The valve device 11 is provided at the base end of the first pipe 7 and the base end of the second pipe 8, and the first liquid supply path 7a and the second liquid supply path 8a, respectively. In this embodiment, both valve devices 11 have the same structure. Therefore, in the following, one valve device 11
The structure will be explained.

This valve device 11 includes a liquid control chamber 19 that is continuous with the first or second liquid supply path 7a, 8a,
A valve seat 20 provided in this liquid control chamber 19,
a needle valve 21 that opens and closes the liquid control chamber 19 in cooperation with the valve seat 20;
The needle valve 21 is configured to include an operation chamber 22 for opening and closing, and a spring 23 disposed within the operation chamber 22 for always pressing the needle valve 21 in the closing direction. Liquid A (B) is fed into the liquid control chamber 19 through the liquid supply hole 24, and operating fluid D such as air is fed into the operation chamber 22 through the operating fluid supply hole 25. It's getting old. The operating fluid D is sent into the operating chamber 22 to move the needle valve 21 in the opening direction against the elastic force of the spring 23.

Next, the operation of the coating gun 6 of this embodiment configured as described above will be explained.

First, when applying by means of the first spray head 9, the valve device 1 connected to the first pipe 7 is
Liquid A is fed into the liquid control chamber 19 from the liquid supply hole 24 of No. 1, and operation fluid D is fed into the operation chamber 22 through the operation fluid supply hole 25 to move the needle valve 21 in the opening direction.

When the needle valve 21 is moved in this way, the contact between the needle valve 21 and the valve seat 20 is broken, and the liquid control chamber 19 and the first liquid supply path 7a are separated from each other.
The liquid A in the liquid control chamber 19 is in communication with the first liquid supply path 7a and the nozzle 1.
2 and can be discharged and applied to the surface to be coated.

Also, the liquid B is sprayed by the second spray head 10.
When applying liquid B, liquid B is supplied through the liquid supply hole 24 into the valve device 11 connected to the second pipe 8.
, and then stop feeding the operating fluid D to the one valve device 11 and perform an operation to feed the operating fluid D to the other valve device 11.

By such operation, the one valve device 1
It is possible to close one liquid control chamber 19 and open the liquid control chamber 19 of the other valve device 11. As a result, the first spray head 9 stops applying the liquid A, and the liquid B sent to the other valve device 11 is discharged through the second liquid supply path 8a and the second spray head 10 for application. can do. Since this second spray head 10 is made to protrude in the radial direction of the second pipe 8, it can be
Even when applying the coating to one surface, uniform coating can be easily applied to each surface.

In addition, in the above embodiment, the second spray head 10
Although an example has been described in which the spray head is provided in the radial direction of the second pipe 8, that is, perpendicular to the first spray head 9, the present invention is not limited to this, and changes may be made as appropriate depending on the shape of the surface to be painted, etc. It is possible.

As explained above, the coating gun according to the present invention provides the following excellent effects.

Since the first liquid supply path and the second liquid supply path were formed by fitting the second pipe to the outside of the first pipe, both liquid supply paths were formed concentrically. The shape around the painting gun can be made compact, making it easier to insert into narrow areas.
This facilitates the application of two types of liquids in this narrow space.

Since one spray head is installed to intersect with the axis of the first pipe, both spray heads can be effectively opposed to each of the intersecting surfaces to be painted, allowing uniform application to the surfaces to be painted. becomes. Furthermore, even if the intersecting surfaces to be coated are in narrow areas where the inclination of the coating gun is restricted, the coating can be carried out reliably and easily in combination with the above effects.

[Brief explanation of the drawing]

In the drawings, FIG. 1 is a schematic diagram showing an example of a conventional coating apparatus, and FIG. 2 is a partially sectional plan view showing an embodiment of the present invention. 6...Painting gun, 7...First pipe, 7a...First liquid supply path, 8...Second pipe, 8a...Second
liquid supply path, 9...first spray head, 10
. . . second spray head, 11 . . . valve device.

Claims (1)

[Scope of utility model registration request] A second pipe forming a second liquid supply path is provided on the outside of the first pipe forming the first liquid supply path, and a second pipe forming the second liquid supply path is fitted around the outer periphery of the first pipe, A first spray head is provided at the tip of the pipe to discharge the liquid sent into the first liquid supply path to the outside, and a first spray head is provided on the outer wall of the second pipe to discharge the liquid sent into the second liquid supply path. A second spray head for discharging liquid to the outside is provided to intersect the axis of the first pipe, and a flow of liquid supplied to each liquid supply path is provided at the proximal ends of the first and second pipes. A painting gun characterized by being provided with a valve device for controlling each.