JPH0335419Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The invention is used, for example, when applying anti-rust paint to the inner circumferential surface of the pipe from which rust has been removed during water pipe repair work. The main body is movable along the axis of the tube, and includes an applicator that applies paint to the inner peripheral surface of the tube by rotating around the axis along the direction of movement, and an air motor that drives the applicator. This article relates to the in-pipe coating equipment provided.

[Conventional technology]

In a conventional pipe coating device of this type, the applicator is disposed behind the air motor, but the exhaust air from the air motor can freely flow toward the applicator. Therefore,
Even if the paint is evenly applied to the inner circumferential surface of the pipe with an applicator, the fluidized paint film is undulated by the above-mentioned exhaust gas, resulting in a uniform thickness and smooth surface. It was not possible to paint the inner surface of the pipe.

[Problem that the invention attempts to solve]

The present invention has been developed in view of these circumstances, and its purpose is to prevent paint defects caused by exhaust from the air motor.

[Means for solving problems]

The characteristic structure of the pipe interior coating device according to the present invention, which was taken to achieve the above object, is that the applicator is disposed behind the air motor, and the pipe inner circumferential surface is provided between the applicator and the exhaust port from the air motor. A sealing material is provided which is in sliding contact with the pipe in an airtight manner to partition the inner part of the pipe around the applicator and the inner part of the pipe around the exhaust port. The effects and effects thereof are as follows.

[Effect]

The sealing material can separate the inside of the pipe around the paint applicator from the inside of the pipe around the exhaust port, so the exhaust air from the air motor will flow into the applicator, and the incoming air will cause the paint film to wave. This can be prevented. Furthermore, by partitioning the inside of the pipe with a sealing material, it is possible to prevent the exhaust gas from flowing into the applicator side, so for example, the exhaust gas can be discharged outside the pipe through a duct inserted into the pipe to prevent the coating film from waving due to the exhaust gas. The structure is simple and inexpensive compared to
Moreover, it is easy to handle.

[Effect of idea]

Therefore, the present invention prevents paint defects caused by exhaust from the air motor and improves the quality of the paint inside the pipe.
Furthermore, it has been possible to provide an apparatus for painting inside pipes that is accurate and easy to implement.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

It is a device for applying paint such as anti-rust paint to the circumferential surface a of a pipe such as a water pipe whose inner circumferential surface has been rust-removed, and this in-pipe coating device 1 is as shown in FIG. , the paint is sprayed onto the inner circumferential surface a of the tube while being pulled and moved inside the tube A along the axial direction of the tube via a wire 2. Specifically, it is constructed as follows. ing.

In other words, as shown in FIG. 2, a cylindrical tube is pulled and moved in a state substantially concentric with the tube A via three circumferentially-made leaf spring feet 3a that slide on the inner peripheral surface a of the tube. An applicator 4 that sprays paint radially outward by rotating around an axis X along the moving direction is attached to the rear end of the main body 3, and the applicator 4 is driven to the main body 3. It is constructed by incorporating an air motor 5 inside.

The main body 3 includes a paint supply path 7 that leads the paint from the paint supply pipe 6 to the applicator 4, and a hardener supply path 9 that leads the hardener from the paint hardener supply pipe 8 to the applicator 4.
, an air supply path 11 that guides air from the air supply pipe 10 to the air motor 5;
An exhaust port 12 for discharging the exhaust gas from the pipe A into the pipe A is formed, and the pipe A is in airtight sliding contact with the inner circumferential surface a of the pipe between the exhaust port 12 and the applicator 4, so that the air around the applicator 4 is Pipe inner part A ₁ and exhaust port 12
A sealing agent 13 is attached to partition the pipe from the surrounding inner pipe portion _A2 .

The applicator 4 has a mixing chamber 14 for coating and curing agent.
and a mixing cylinder 16 in which a plurality of slits 15 are formed at appropriate intervals in the circumferential direction for discharging the paint mixed with the curing agent radially outward at the supply pressure. A stirring tool 18 is provided inside the mixing cylinder 16 for stirring and mixing the paint and the curing agent with the blades 17 by rotating around the rotation axis X.
5 is caught by the conical inner circumferential surface 19a around the rotation axis X, and by centrifugal force by rotating around the rotation axis X, the paint is caught on the conical inner circumferential surface 19a. A diffusion tube 19 is provided along the diffusion tube 19 for diffusion, and a plurality of holes 20 are formed in the diffusion tube 19 to scatter the diffusion paint to the outside of the diffusion tube 19 by centrifugal force. Note that the mixing cylinder 16 is connected to the main body 3 at its front end.
The stirring tool 18 is attached to the shaft end of the air motor 5, and the stirring tool 18 is attached to the shaft end of the air motor 5.
is attached to the rear end of the stirrer 18 via bolts and nuts 21.

The tensile movement of the main body 3 via the wire 2 is
This is done by winding up the wire 2 with a winch, and the supply pipes 6, 8, 10 are bundled together with the wire 21 and wound around the winch.

[Brief explanation of the drawing]

The drawings show an embodiment of the pipe coating apparatus according to the present invention, in which FIG. 1 is a longitudinal side view, FIG. 2 is a cross-sectional view taken along the line -- in FIG. 1, and FIG. 3 is an exploded perspective view of the main parts. A...Tube, 3...Main body, 4...Applicator, 5...
Air motor, 12...exhaust port, 13...sealing material.

Claims (1)

[Claims for Utility Model Registration] Application in which paint is applied to the inner circumferential surface of a tube by rotating a main body 3 that is movable within a tube A along the axis of the tube around an axis X along the direction of movement. In an in-pipe coating apparatus equipped with a coating device 4 and an air motor 5 for driving the same, the applicator 4 is disposed behind the air motor 5, and an exhaust port 1 from the applicator 4 and the air motor 5 is provided.
2, in sliding contact with the inner peripheral surface of the pipe in an airtight state,
This pipe coating device is provided with a sealing material 13 that partitions the pipe inner part _A1 around the applicator 4 and the pipe inner part _A2 around the exhaust port 12. The pipe coating apparatus according to claim 1, wherein the applicator 4 sprays the paint radially outward by rotational centrifugal force.