JPH06320068A - Tip jig for coating inside of tube - Google Patents

Abstract

PURPOSE:To evenly coat the inside of reducing tubes by providing a tip having a powder discharge port on the end of a body so constituted that it is flexible and providing a guide for keeping, the tip and the inside of the tube from contact with one another on the outer surface near the end of the body. CONSTITUTION:A tip jig for coating the inside of tubes 1 is fitted to an electrostatic gun and inserted into the inside of a reducing of high temp. to be inside coated and coating powder electrostatically charged is discharged from discharge ports 19 to electrostatically stick it on the inside of the tube. In this case, since a pipe part 2 of the tip jig ] has flexibility and the pipe part 2 and a cylindrical part 3 are rotatably and pivotally supported by a connector, the tip jig 1 is easily inserted into the reducing tube and drawn from it. And since a guide 24 surrounding the tip 5 around the powder discharge ports 19 is provided on the cylindrical part 3, the tip 5 is prevented from coming into contact with the inside of the reducing tube and passed though the central part. Consequently the coating powder is evenly dispersed over the inside of the reducing tube to form a good coating film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe inner surface coating tip jig used for coating and lining the inner surface of a pipe or the like, and particularly for powder coating the inner surface of a deformed pipe having a complicated structure. The present invention relates to a tip jig for painting the inside surface of a pipe that is attached to an electrostatic gun.

[0002]

2. Description of the Related Art Conventionally, powder coating of the inner surface of a deformed pipe has been carried out by inserting a long barrel attached to an electrostatic gun into the inside of the pipe. The long barrel is a rod-shaped nozzle provided with a reflector at the tip, and is configured to discharge the electrostatically charged coating powder ejected from the rod-shaped nozzle from the reflector by operating the electrostatic gun. ing. Since the discharged powder adheres electrostatically to the inner surface of the tube, the powder can come into contact with the hot wall of the tube and melt to form a coating film on the inner surface of the tube.

[0003]

However, since the conventional long barrel is rod-shaped as described above, a deformed pipe into which the long barrel cannot be inserted or an inner surface of the deformed pipe in which the tip of the long barrel comes into contact with the inner surface of the pipe. Could not be powder coated.

The present invention solves the above problems, and an object of the present invention is to enable powder coating of the inner surface of a profiled pipe which could not be conventionally coated.

[0005]

In order to solve the above problems, the tip jig for coating the inner surface of a pipe of the present invention is a flexible tip jig for coating the inner surface of a pipe mounted on an electrostatic gun for powder coating. A tip having a powder discharge port is provided at the tip of the body part configured in 1., and the tip is surrounded by the powder discharge port on the outer surface in the vicinity of the tip of the body part so that the tip and the inner surface of the pipe contact each other. It is characterized by providing a guide for preventing

Further, the tip jig for coating the inner surface of the pipe of the present invention is characterized in that the tip is rotatable around the axis and the discharge port is capable of imparting a rotational force to the chip by the discharge reaction force. And

[0007]

In the above construction, since the tip is provided at the tip of the flexible body portion, the coating tip jig can be inserted into the inside of the deformed pipe to coat the inner surface of the deformed pipe. In addition, by providing a guide on the outer surface near the tip of the body part around the powder discharge port to prevent contact between the tip and the inner surface of the tube, the tip can pass through the center part of the tube. The inner surface of the irregularly shaped pipe can be painted evenly because it can be coated.

Further, since the tip is configured to be rotatable about its axis and the discharge port is configured to be able to give a rotational force to the tip by the discharge reaction force, the tip is rotated by supplying powder. Since the powder can be discharged from the rotating tip, the powder can be favorably dispersed on the inner surface of the profiled pipe and can be coated evenly.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a vertical sectional view showing a tip jig for coating a pipe inner surface according to an embodiment of the present invention. Tip jig for painting the inner surface of pipe 1
Is configured by providing a tip 5 at the tip of a body portion 4 including a tube portion 2 and a cylindrical portion 3. The tube part 2 is a vinyl hose 6
By arranging a heat insulating material 7 such as a cloth on the outside of the structure, it is configured to have flexibility and heat insulating properties. A vinyl pipe 9 has one end 10 inserted into the pipe portion 2 and the other end 11 extended and fixed to the outside of the pipe portion 2 on the distal end side 8 of the pipe portion 2. The tube portion 2 and the cylindrical portion 3 are connected. The other end 11 of the vinyl pipe 9 is provided with a connector 12 having a ball-shaped outer shape, and the ball-shaped connector 12 has a cylindrical inner wall 13 and an outer wall 14 having a spherical convex surface. It is fixed to the outer circumference of the vinyl pipe 9 at 13.

A cylindrical portion 3 is arranged on the outer peripheral side of the connecting member 12, and a ring 16 is arranged between the connecting member 12 and the cylindrical portion 3, and the cylindrical portion 3 is fixed on the ring 16. Supported on the connector 12. The ring 16 has a spherical concave surface corresponding to the outer wall 14 which is a spherical convex surface of the connector 12 as an inner wall 17, and is rotatably supported on the connector 12. Therefore, the member such as the cylindrical portion 3 fixed on the ring 16 is, as shown in FIG.
Can rotate around 12.

The tip 5 is provided at one end 18 of the cylindrical portion 3. The tip 5 is formed in a cylindrical shape with one end face closed, and a plurality of powder discharge ports 19 are provided on the outer circumference on the closed end face side. The other end 20 of the tip 5 is arranged inside the cylindrical portion 3, and is fixed by a ring 21 arranged between the cylindrical portion 3 and the tip 5 near one end 18 of the cylindrical portion. Further, the other end 22 of the cylindrical portion 3 is arranged so as not to overlap the pipe portion 2 so that the other end 22 does not hinder the relative rotation between the pipe portion 2 and the cylindrical portion 3.

The outer wall 23 of the cylindrical portion 3 is provided with a guide 24 extending from the cylindrical portion 3 in the radial direction and the tip direction.
The guide 24 changes its direction at a position near one end 18 of the cylindrical portion and extends substantially parallel to the cylindrical portion 3 to a position where the discharge port 19 is not covered.

Inside the vinyl pipe 9, a powder guiding hose 25 for guiding the powder from the pipe portion 2 to the cylindrical portion 3 is arranged. Further, an electrostatic wire 26 capable of charging powder is guided from an electrostatic gun (not shown) to the inside of it, and is connected to the chip 5.

The operation of the above structure will be described below.
The tip jig 1 for coating the inner surface of the pipe is attached to the electrostatic gun, and is inserted into the high-temperature deformed pipe 27 to be coated on the inner surface as shown in FIG. Let Then, while supplying static electricity to the electrostatic wire 26 by the electrostatic gun, the coating powder is supplied from the tube portion 2 side and sent to the chip 5 through the powder guide hose 25, and the discharge port 19
The powder is discharged in a radial direction to discharge the electrostatically charged powder and electrostatically attach it to the inner surface of the tube. Then, as shown in the drawing, the tip jig 1 is gradually pulled out while discharging the powder, and the powder is sequentially attached to the inner surface of the pipe. Then, the coating is formed by melting the powder.
The powder is discharged from the tip 5 without being melted inside the tube portion 2 because the tube portion 2 has a heat insulating property.

In the above, since the tube portion 2 of the tip jig 1 is flexible and the tube portion 2 and the cylindrical portion 3 are rotatably supported by the connecting tool, the tip jig 1 is It can be easily inserted into the deformed tube 27 and pulled out from the deformed tube 27. Further, since the guide portion 24 that surrounds the tip 5 around the powder discharge port is provided in the cylindrical portion 3, contact of the tip 5 with the inner surface of the tube 27 is prevented, and the tip 5 covers the central portion of the tube 27. As it passes, the powder is evenly dispersed on the inner surface of the tube 27, and a good coating film is formed.

Next, with reference to the vertical sectional view of FIG. 4 and the front view of FIG. 5, a tip jig for coating the inner surface of the pipe according to another embodiment of the present invention will be described. In this embodiment, members having the same configurations and functions as those of the pipe inner surface coating tip jig of the embodiment shown in FIGS. 1 to 3 are designated by the same reference numerals and the description thereof will be omitted.

In the tip jig 28 of this embodiment, the tip 5 is formed in a tubular shape with its tip closed, and is provided at one end 18 of the cylindrical portion 3. A bearing 29 is provided between the tip 5 and one end 18 of the cylindrical portion, so that the tip 5 can rotate around the axis inside the cylindrical portion 3.

The powder discharge port 30 is formed in the shape of a plurality of pipes, and extends from the side surface of the chip 5 so as to bend in a slightly radial tangential direction and slightly toward the tip end. Further, a flexible auxiliary air vinyl hose 31 is provided inside the tube portion 2, and air can be supplied into the chip 5 from this hose 31. As a result, the mixture of air and powder is vigorously ejected from the ejection port 30, and as a result, the tip 5 supported by the bearing 29 is rotated around the axis by the ejection reaction force.

Also in the tip jig 28 having the above-described structure, the tip jig 28 has flexibility as in the embodiment shown in FIGS. 1 to 3, so that the tip jig 28 can be easily placed in a deformed pipe. Can be inserted and withdrawn from the profiled tube. Further, the guide 24 provided on the cylindrical portion 3 can prevent the tip 5 from coming into contact with the inner surface of the deformed tube and allow the tip 5 to pass through the central portion of the tube. It can be evenly dispersed to form a coating film.

At this time, the vinyl hose 31 for auxiliary air
By supplying air from the discharge port 30 to the chip 5 and ejecting it from the discharge port 30 together with the powder as shown in FIG. Powder is discharged radially. As a result, the powder can be evenly dispersed on the inner surface of the tube to form a good coating film.

[0021]

As described above, according to the present invention, by providing the tip having the powder discharge port at the tip of the flexible body portion, the coating tip jig is provided with flexibility and complicated. Since it is configured so that it can be inserted into a deformed pipe of a different structure, the inside of the deformed pipe can be painted. In addition, a guide is provided on the outer surface near the tip of the body to prevent contact between the tip and the inner surface of the pipe.This allows the tip to pass through the center of the pipe, so that the inner surface of the deformed pipe can be painted evenly. is there.

Further, since the tip is rotated around the axis by the reaction force of the powder discharge, the powder for coating is well dispersed from the rotating tip to the inner surface of the pipe, and the inner surface of the profiled pipe is uneven. Can be painted without.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view illustrating a tip jig for coating a pipe inner surface according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of an essential part for explaining the operation of the tip jig for painting the inner surface of the pipe of FIG.

FIG. 3 is a cross-sectional view illustrating a state in which the tip jig for coating the inner surface of the pipe of FIG. 1 is inserted into the inside of the deformed pipe for coating.

FIG. 4 is a vertical cross-sectional view illustrating a tip jig for coating an inner surface of a pipe according to another embodiment of the present invention.

5 is a front view of the pipe inner surface coating tip jig of FIG. 4. FIG.

[Explanation of symbols]

 1 Inner surface coating tip jig 4 Body 5 Tip 18 Tip 19 Powder ejection port 24 Guide 28 Inner surface coating tip jig 30 Powder ejection port

Claims (2)

[Claims] 1. In a tip jig for coating the inner surface of a pipe mounted on an electrostatic gun for powder coating, a tip having a powder discharge port is provided at the tip of a flexible body portion, and the tip of the body portion is provided. A tip jig for coating the inner surface of a pipe, characterized in that a guide is provided on the outer surface in the vicinity to surround the chip around the powder discharge port to prevent contact between the chip and the inner surface of the pipe. 2. The pipe inner surface coating according to claim 1, wherein the tip is configured to be rotatable about its axis, and the discharge port is configured to apply a rotational force to the tip by its discharge reaction force. Tip jig.