JPH0368744B2 - - Google Patents

Abstract

PURPOSE:To equalize the amts. of paint to be injected from injection parts by forming the injection part of a rotatable diffusion cylinder in a position inclined to the generatrix of a conical inner peripheral surface. CONSTITUTION:An agitation part 18 and a diffusion cylinder 19 for stopping paint from the agitation part 18 with a conical inner peripheral surface 19a around the axis X of rotation in the moving direction and diffusing the stopped paint along the conical inner peripheral surface 19a by the centrifugal force produced by the revolution around the axis X of rotation, is provided to a main body 3 capable of moving in a pipe A along the axial direction of the pipe. In the diffusion cylinder 19, plural injection parts 20 leading from one end of the diffusion cylinder 19 in the axial direction to the other and used for injecting the diffused paint to the outside of the diffusion cylinder 19 by the centrifugal force are formed at appropriate intervals in the circumferential direction and the injection part 20 is inclined to the generatrix (l) of the conical inner peripheral surface 19a. Consequently, the amts. of paint to be injected from each injection part are equalized and the inner peripheral surface of a pipe can be coated with a film having uniform thickness.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is used, for example, when applying rust-preventive paint to the inner peripheral surface of a pipe from which rust has been removed during water pipe rehabilitation work. The main body, which can be moved inside the tube along the axis of the tube, has a stirring section that stirs and mixes the paint and sprays it radially outward, and a main body that is located on the outer periphery of this stirring section and distributes the paint from the stirring section in the moving direction. a diffusion tube that receives the paint with a conical inner circumferential surface around a rotational axis along the axis of rotation, and diffuses the received paint by centrifugal force as it rotates around the rotational axis along the conical inner circumferential surface; , and a plurality of spouting parts are installed on the diffusion tube as appropriate in the circumferential direction, and are located between both ends of the diffusion tube in the axial direction, and eject the diffusion paint to the outside of the diffusion tube by centrifugal force. The present invention relates to an in-pipe paint device formed at intervals.

[Conventional technology]

In a conventional pipe painting device of this type, each of the above-mentioned jetting portions was formed in a posture along the generatrix of the conical inner circumferential surface (for example,
Publication No. 41894).

However, when using the above-mentioned conventional device,
Among the diffusion paints on the inner circumferential surface of the cone, the paint that flows in the direction of the generatrix does not enter the ejection part, and the paint that enters the ejection part is the paint that flows in a direction inclined to the generatrix, (Example with large inner circumferential diameter)
Coupled with the fact that the distance between adjacent ejection parts becomes larger, the probability that paint will enter the ejection part becomes worse toward one end of the ejection part, and the amount of paint that enters becomes uneven. As a result, there is a large variation in the amount of paint ejected from one end of the ejection part, making it impossible to apply the paint to the inner circumferential surface of the tube at a constant thickness.

[Problem that the invention seeks to solve]

The present invention was developed in view of the above circumstances, and its purpose is to average the amount of paint ejected from the ejection portion.

[Means for solving problems]

A characteristic feature of the pipe coating apparatus according to the present invention, which has been adopted to achieve the above object, is that the ejection portion is formed in a posture inclined with respect to the generatrix of the conical inner circumferential surface. The effects and effects thereof are as follows.

[Effect]

Since the spouting part is inclined with respect to the generatrix of the conical inner circumferential surface, paint flowing along the generatrix passing through each part can be filled into each part of the spouting part, and the paint entering each part of the spouting part can be Amounts can be averaged.

〔Effect of the invention〕

Therefore, the present invention has reached the point where it is possible to provide an in-pipe coating device that can apply paint to the inner circumferential surface of a pipe by equalizing the amount of paint ejected from each part of the ejection part so that the thickness of the paint film is constant. Ivy.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

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

In other words, as shown in FIG. 2, the cylindrical body is pulled and moved while being positioned approximately concentrically with the tube A via three circumferentially made leaf spring legs 3a that slide on the inner circumferential 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 exhaust gas from the pipe A into the pipe A is formed.

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 dispersing the paint mixed with a curing agent radially outward with its supply pressure. a stirring tool 1 that stirs and mixes the paint and the curing agent with the blades 17a by rotating around the rotation axis (X);
7 is provided, and is located on the outer periphery of the mixing cylinder 16 to receive the sprayed paint from the slit 15 on a conical inner peripheral surface 19a around the rotation axis (X), A diffusion cylinder 19 is provided which diffuses the received paint along the conical inner peripheral surface 19a by centrifugal force by rotating around the rotation axis (X), and this diffusion cylinder 19
In addition, a plurality of ejection parts 20 are formed at appropriate intervals in the circumferential direction, and are located between both ends of the diffusion cylinder 19 in the axial direction, and eject the diffusion paint to the outside of the diffusion cylinder 19 by centrifugal force. It is configured as follows. Each of the ejection parts 20 is constructed by forming a series of slits 20a between both ends of the diffusion tube 19 in the axial direction, and one end of the slit 20a is adjacent to the other end of the slit 20a. It is formed in a posture inclined with respect to the generatrix (l) so as to be located on the same line as the other end side of the ejection part 20. Note that the mixing cylinder 16
is fitted into and fixed to the main body 3 at its front end, the stirring tool 17 is attached to the shaft end of the air motor 5, and the diffusion tube 19 is attached to the rear end of the stirring tool 17 via a bolt/nut 21. installed.

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, and 10 are bundled together with the wire 2 and wound around the winch.

According to the above configuration, the paint that diffuses and flows along the conical inner peripheral surface 19a in the generatrix direction due to rotational centrifugal force always enters the slit 20a, and as a result,
This allows the amount of paint entering the slit 20a to be averaged.

In the above embodiment, the ejection part 20 was formed with a slit 20a, but in the present invention, as shown in FIG. The ejection portion 20 may be configured by forming a plurality of holes 20b.

[Brief explanation of drawings]

Figures 1 to 4 show an embodiment of the pipe coating device according to the present invention, in which Figure 1 is a longitudinal sectional side view, Figure 2 is a sectional view taken along the - line in Figure 1, and Figure 3 is an exploded view of the main parts. The perspective view and FIG. 4 are side views of the main parts. FIG. 5 is a side view of main parts showing another embodiment. A...Tube, 3...Main body, 18...Stirring section, 19
a... Conical inner peripheral surface, 19... Diffusion cylinder, 20...
Spout portion, 20a... slit, 20b... hole.

Claims (1)

[Scope of Claims] 1. A main body 3 movable within the tube (A) along the axis of the tube includes a stirring section 18 that stirs and mixes paint and sprays it radially outward; and this stirring section 18. By receiving the paint from the stirring part 18 on the outer periphery of the stirring part 18 on the conical inner peripheral surface 19a around the rotation axis (X) along the moving direction, and rotating around the rotation axis (X). A diffusion tube 19 that diffuses the received paint along the conical inner circumferential surface 19a by centrifugal force is attached to the diffusion tube 19, and the diffusion tube 19 is placed in a state extending between both ends of the diffusion tube 19 in the axial direction. In an in-pipe paint device in which a plurality of spouting portions 20 are formed at appropriate intervals in the circumferential direction, the spouting portions 20 are arranged at appropriate intervals in the circumferential direction, and the spouting portions 20 are arranged in a conical inner periphery. The pipe coating device is formed in an attitude inclined with respect to the generatrix (l) of the surface 19a. Claim 1, wherein the spouting part 20 is formed in an inclined position such that one end thereof is located on the same generatrix (l) as the other end of the jetting part 20 adjacent to one side thereof. pipe painting equipment. Each of the jetting portions 20 has a diffusion tube 19.
A series of slits 2 between both ends in the axial direction of
An in-pipe coating device according to claim 1 or 2, which is configured by forming a pipe 0a. Each of the jetting portions 20 has a diffusion tube 19.
Claim 1 or 2 is constructed by forming a plurality of holes 20b at appropriate intervals between both ends in the axial direction.
In-pipe coating equipment described in section.