JP2555153Y2 - Electrostatic gun - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic gun for powder coating the inner surface of a pipe such as a deformed pipe.

[0002]

2. Description of the Related Art Conventionally, an electrostatic gun as shown in FIG. 4 has been used for powder coating the inner surface of a tube. In this electrostatic gun, a straight rod-shaped extension member 4 is connected to the paint delivery section 2 of the gun body 1, and a paint spray nozzle 7 is provided at the tip of the extension member 4. The nozzle 7 has a nozzle body 8 for ejecting paint, and the disk-shaped reflecting plate 3.
At the time of coating, the extension member 4 is inserted into the tube 5, and the powder coating material 6 sent out from the paint delivery unit 2 and passing through the inside of the extension member 4 is ejected from the nozzle body 8, and the tube 5 is reflected by the reflection plate 3. Is reflected outward in the radial direction and is injected toward the entire circumference of the inner surface of the tube 5.

[0003]

However, in such a conventional electrostatic gun, since the extension member 4 is a straight rigid body, when the tube 5 is a deformed tube as shown by a virtual line in FIG. However, there is a problem that it is difficult to insert the extension member 4 into the curved portion of the pipe 5, and thus it is not possible to completely apply the powder inside the pipe.

Accordingly, an object of the present invention is to solve such a problem and to provide an electrostatic gun capable of well coating the inner surface of a deformed tube with powder.

[0005]

In order to achieve the above object, according to the present invention, a flexible extension member is connected to a paint delivery portion of a gun body, and a nozzle for ejecting paint is provided at a tip of the extension member. A guide member for supporting the nozzle on the axis of the tube is provided, and the guide member is formed of a three-pronged bar material that is spaced apart in the circumferential direction of the nozzle, and has a base end portion. In addition to being fixed to the nozzle, the tip is slidable with respect to the inner surface of the tube.

[0006]

When the inner surface of the tube is powder-coated with the electrostatic gun having such a configuration, a nozzle is inserted into the tube. Even if the tube is a deformed tube, the nozzle is smoothly inserted due to the flexibility of the extension member. Insertion is performed. Thereafter, powder coating is performed while pulling the extension member out of the tube. At this time, since the nozzle is supported on the axis of the tube by the guide member, uniform powder coating over the entire circumference and the entire length of the tube is possible despite the flexibility of the extension member. Further, it is possible to prevent the painted surface from being damaged by the nozzle hitting the inner surface of the deformed pipe. The guide member is formed of a three-pronged bar material that is spaced in the circumferential direction of the nozzle, and has a base end fixed to the nozzle and a tip end slidable with respect to the inner surface of the tube. Therefore, the nozzle is always positioned on the axis of the tube regardless of the direction of the tube. Further, since the tip of the three-pronged bar only slides on the inner surface of the tube, the frictional resistance when moving the nozzle in the tube becomes small. Of course, powder coating on the inner surface of straight pipes as well as deformed pipes is also possible.

[0007]

1 to 3 illustrate an operation of powder coating the inner surface of a deformed pipe 11 using an electrostatic gun according to an embodiment of the present invention. In this electrostatic gun, an extension member 15 is connected to a paint delivery section 13 of the gun body 12 via a pipe joint 18. The extension member 15 has flexibility and is constituted by, for example, a flexible hose whose outer periphery is covered with a stainless steel fabric, a stainless steel flexible tube, or the like. A nozzle 22 is attached to the tip of the extension member 15 via a pipe joint 19. The nozzle 22 includes a cylindrical nozzle body 20 and a reflector 14 disposed so as to face the tip of the nozzle body 20, and the reflector 14 has a convex paint reflection surface 16. . A gap 17 for spraying paint is formed between the nozzle body 20 and the reflection plate 14.

A guide member 21 is provided on the outer periphery of the nozzle body 20. The guide member 21 is constituted by hook-shaped round bars or the like installed at three places at intervals of 120 degrees in the circumferential direction of the nozzle body 20, and the base end thereof is fixed to the nozzle body 20. At the same time, the tip contacts the inner surface of the deformed pipe 11,
And it is slidable along this inner surface. Because of this nozzle
22 is supported on the axis of the modified tube 11 by the guide member 21.

With the electrostatic gun having such a configuration, the deformed tube 11 is formed.
To apply powder coating to the inner surface of the
To the back of the inside. At this time, since the extension member 15 has flexibility, the insertion of the nozzle 22 is smoothly performed without any trouble to the deformed pipe 11 having a bend as illustrated.

Thereafter, the powder coating material 23 is sent out from the gun body 12 while pulling out the extension member 15 from the deformed pipe 11. The fed powder paint 23 passes through the extension member 15 and is jetted from the nozzle body 20 toward the paint reflection surface 16 of the reflection plate 14, and is reflected by the paint reflection surface 16 in all circumferential directions to form the gap 17 Is ejected toward the inner surface of the deformed pipe 11. Then, by pulling out the extension member 14, the inner surface of the deformed pipe 11 is powder-coated over the entire circumference and the entire length. At that time, since the guide member 21 supports the nozzle 22 on the axis of the deformed pipe 11, uniform powder coating without unevenness is possible, and the coating surface is damaged by the nozzle 22 hitting the inner surface of the deformed pipe 11. Is prevented.

[0011]

As described above, according to the present invention, since the extension member is flexible, not only can the nozzle be smoothly inserted into the tube, but also the extension member is moved out of the tube. When performing powder coating while pulling out, the nozzle is supported on the axis of the pipe by the guide member, so that the powder is uniformly distributed over the entire circumference and the entire length of the pipe despite the flexibility of the extension member. Body painting can be performed. In addition, the guide member is formed of a three-pronged rod material spaced apart in the circumferential direction of the nozzle, and has a base end fixed to the nozzle and a tip end slidable with respect to the inner surface of the tube. Therefore, the nozzle can always be positioned on the axis of the tube regardless of the direction of the tube. Moreover, it is possible to prevent the painted surface from being damaged by the nozzle hitting the inner surface of the deformed pipe. Further, since the tip of the three-pronged bar only slides on the inner surface of the tube, the frictional resistance when moving the nozzle in the tube can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a use state of an electrostatic gun according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part in FIG.

FIG. 3 is a view as viewed in the direction of the arrow Z in FIG. 2;

FIG. 4 is a diagram showing a usage state of a conventional electrostatic gun.

[Explanation of symbols]

 11 Deformed tube 12 Gun body 13 Paint delivery section 14 Reflector 15 Extension member 20 Nozzle body 21 Guide member 22 Nozzle

Claims (1)

(57) [Scope of request for utility model registration] 1. An electrostatic gun for powder coating an inner surface of a tube, wherein a flexible extension member is connected to a paint delivery portion of a gun body, and a tip for spraying paint is attached to a tip of the extension member. A nozzle is provided, and a guide member for supporting the nozzle on the axis of the pipe is provided.
Composed of three-pronged bars that are spaced
With the end fixed to the nozzle, the tip is
An electrostatic gun characterized by being slidable on the inner surface of the storage tube .