JPS5959301A - Coating stripper of coated pipe - Google Patents

Abstract

PURPOSE:To efficiently peel and strip a coating by providing a mechanism peeling the coating of a highly-adhesive coated pipe utilizing a small rotating force with a cutting tool in a coating stripper of the coated pipe used for city gas, LP gas, etc. CONSTITUTION:After a coated pipe 1 is fixed to a pipe holder 2 by use of the feed handle 31 of a clamper 3 through a winding ring 211, the feed handle 31 is returned to a solid line position from a two-dot chain line position. Next, the operating handle 41 of a cutting edge feeder 4 is operated to allow the tip of a cutting tool 52 to cut into a coating 11 at an angle of alpha deg. to the circular tangent direction of a coated material 11 at the two-dot chain line position by means of a link action of pivotal axes 43, 53, and by turning the handle 41 horizontal the cutting tool 52 reaches a steel pipe main body 12. Then, a rotating force is applied to the pipe by the feed operating handle 41 and clamping feed handle 31, thus the coating can be peeled off without allowing the cutting tool 52 to bite into the metal portion of the steel pipe 12.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for stripping and removing the coating of a coated pipe.

In recent years, coated steel pipes have been used for undergrounding, supplying, and piping for city gas, LP gas, etc., and are being used for corrosion protection. It is often used from the viewpoint of 1.

Conventional coating@pipe is tightened with a threaded J-repipe wrench during piping work.
often occurred. On the other hand, recently, the handling of each quadruple at the site has been improved (as shown in Figure 1), the difference in formability due to the drying of the steel pipe surface is 7' + =
-r: Defined polyethylene is destroyed and polyethylene is coextruded at the same time, tightly adheres to the steel pipe,
Pipes began to be manufactured and used /ξ.

In order to perform cathodic protection on these corrugated pipes, since the covering material itself is an insulating material, some of the broken holes in the covering pipe must be removed, and when joining +J&Fb pipes, the covering material must be removed. It will be necessary to remove the inner dimensions of only the part 'c/Mll. In order to separate these corrugations from the covered pipe, conventionally, a cutting edge such as a knife was used to remove them, but this was inefficient and still caused damage to the coating (18 (J0 By beer method) ~3 M/cm culm Wf (7)
In the case of coated pipes, the conventional method can be used, but when using the above-mentioned modephite polyethylene with F base and 17cm, the adhesion strength of polyethylene coated pipes is 6 to 20) + 7/cm, which is a strong adhesion. is difficult to peel off and remove.

The object of the present invention is to use a cutting tool to efficiently peel off and remove the coating of a highly adhesive coated pipe with a small amount of force.

Next, the details of the present invention will be explained below based on the drawings which are examples. Fig. 2 is a diagram showing a coating removal device for a coated pipe which is a first embodiment of the present invention, Fig. 3 is a side view, and Fig. 4 is a diagram showing a coating removing device for a coated pipe which is a second embodiment of the present invention. It is a side view of a removal device.

In FIGS. 2 and 6 which are the first embodiment of the present invention,
In the coated pipe 1, the surface of the steel pipe 120 is coated with an anticorrosive coating 11 made of polyethylene or the like.

The covered pipe 1 is held and fixed by a pipe holding device 2 as shown in FIG. The gripping device 2t includes a sliding gripping member 21, a fixed gripping member 22, a shape member 26, and a base 24.
The pipe 1 is gripped and fixed by four rings 211, each of which is wound with an elastic material such as urethane rubber, and supported by shafts 212 provided on the gripping members 21 and 22. The sliding portion 21 is tensionably slid on the base 24 according to the pipe diameter by the screw mechanism of the tightening device @6, which will be described later, and is engaged with the L-shaped portion 26, and the screw 213 (and 21) The pace 24 has a sliding structure.

The tightening device 3 is located on the center MA-A' of the cross section of the covered pipe, and includes the tightening feed handle 61, the handle movable mechanism 32, the tightening screw mechanism 66, and the tightening device i/? It is comprised of a screw 64 for fixing the sliding part 21 to the tip.

The pipe 1 is held between the gripping members 21 and 22, and the tightening feed handle 61 is rotated horizontally by 90° about the axis of the handle movable mechanism 32 to the position shown by the two-dot chain line in FIG. Torque is applied to the tightening device 6 to cause the sliding holder 21 to slide by means of the female thread 61 and male thread 632, and the ring 211 is used to tighten and hold the covered pipe 1.

Next, the blade feeding device 4 for peeling and removing the coating 11 of the covered pipe 1 consists of a feeding operation knob 41 and a blade feeding operation member 42 welded to this. Intermediate member 2 screwed by 261
The peeling device 5 and the blade feeding device 4 are rotated through a hole 44 at the tip of the blade feeding device 4. It is locked freely. In the peeling device 5, a cutting tool 52 made of cemented carbide is screwed onto the tip of the cutting edge base material 51 with a screw 521, and the cutting tool 52 is attached to the cutting edge base material 51.

The pin 54 is configured to engage the pivot shaft 5 of the dowel for circular arc movement in the tangential direction of the circular arc with the borehole 44 of the blade feeding section described above.

Note that 262 is the stopper of the blade feed operation member 42, and is screwed into the fixed grip member 22 via the middle 1111 member 26.
221 is a modified screw for attaching the intermediate member 26 and the fixed gripping member 22 in response to a change in the specifications of the squib 1.

In the sheathing pipe stripping device having the above-mentioned configuration, the sheathing pipe 1 is wrapped around the pipe gripping device @2 by the feed nozzle 61 of the tightening device 6 and fixed under tension via the link 211. Rotate the handle 51 by 90' from the two-dot chain line position and return it to the solid line position IW, l'. Next, operate the blade feeder i\4 - 7 dollar 41 fF and link the pivots 46 and 53 to the position indicated by the two-dot chain line in Fig. 6, cutting, Cite 52σ) Blade tip 75; An angle α0 (25° in this embodiment) is set in the direction of the circular cutting line of 11 to make it easier for the cutting tool 52 to bite into the coating 11. By making the center line A4' horizontal (rotating by 25 degrees), the cutting hole 52 is attached to the steel pipe body 12 (metal part). By applying rotational force to the pipe with the cutting nodle 61, the cutting nut 52 can be peeled off without biting into the metal part of the steel pipe 1.2.

That is, the feature of the present invention is that the coating/sheathing is removed.
−f When first cutting the cutting hole, the covering σ) arc Q)
The cutting tool is made to bite into the coating at an angle that corresponds to the cutting line direction, and then when the cutting tool reaches the metal part of the main pipe, the cutting tool is moved in an arc in the cutting direction of the arc of the main pipe by the link mechanism, Next, a second embodiment of the present invention will be described with reference to FIG. 4, in which only the coating of the coated pipe is cut off by the rotational force of operating handles installed on both sides of the pipe support device. Reference symbols in the middle of the drawings have the same functions. In FIG. 4, a spring Mkm6 is used to bite the cutting tool 52 into the coating 11 and move it in an arc in the cutting line direction of the pipe 12. The spring mechanism 6 is composed of a spring sweeping lever 61 and a spring 62, and the spring operating lever 61 is connected to the pivot 41153 of the peeling device 5.
The peeling device 5 is pivoted and rotated by a certain angle. On the other hand, the first
In FIG. 6 of the embodiment, the blade feeding device 4 and the peeling device 51 are locked at the tip of the blade feeding device 4 so as to be able to rotate directly through the perforation 44, whereas in the second embodiment, In FIG. 4, the blade feed operation handle 41 is directly connected to the fixed grip portion 22.
The blade feeding member 45 is fixed by welding to the pivot nl+4.
3, the pivot 43 is positioned on the center line AA', and the blade feeding member 45, the peeling device 5, and the spring mechanism 6 are rotatably locked by a pin 54 or the like through the hole 44. There is. In this configuration, a spring-operated blade 61 is first attached to the position 11-1 indicated by the two-dot chain line in the figure to make it easier for the cutting edge of the cutting tool 52 to bite into the coating 11. Thereafter, by rotating the spring-operated lever 61 in the direction of the arrow about the pivot 56 to the stone z-626, the cutting tip 52 moves in an arc in the direction of the cutting line of the steel pipe 12 by the link mechanism, thereby cutting the M solid. It reaches the position of @(, that is, on the cutting line of the pipe 12.

Thereafter, in the same manner as in the previous embodiment, the feeding operation is performed by applying torque to the pipe using the handle 41 and the tightening feed handle 31 to remove only the coating on the surface of the steel pipe.

Although only a single cutting tool 52 is used in this embodiment, it is more efficient to use a plurality of cutting tools to enlarge the area during removal, and it is also possible to mechanize the removal operation. A pipe coating removal device is a device that can easily and efficiently remove the coating of a coated pipe with strong adhesion by using a small rotational force without causing any scratches on the surface of the steel pipe.

[Brief Description of the Drawings] Fig. 1 is a schematic diagram showing the structure of a covered pipe, Fig. 2 is a plan view of the first embodiment according to the present invention, Fig. 6 is a side view of the first embodiment, and Fig. 4 FIG. 2 is a side view of a second embodiment of the present invention. 1: Covered pipe, 11: Covered g, 2 knee holding device,
21: Sliding gripping member, 211: Wrapping with ring, 3: Tightening device, filter 1: Tightening with feeding knob, 4: Blade feeding device, 41: Blade feeding knob, 4 loop, 56: Axis, 5:
Peeling device, 52: Cutting device, 6: Spring mechanism,
61: Spring operation) Throat/l-162 spring, 2
62, 623: Stotsuno 2-Agent Patent Attorney Tree
Mura Sanro 3

Claims (1)

[Claims] 1) A vibrator gripping device that grips and fixes the coated pipe with an 11-digit ring wound with frictional elasticity, a tightening device for sliding the gripping member of the gripping device, and a cutting hole at the tip for peeling off the coating of the coated pipe. stripping equipment with
It consists of a blade feeding device formed by engaging a gripping device and a stripping device, and the pivots of the tightening device and the blade feeding device are on the center line of the cross section of the coated pipe, and the pivot of the stripping device is below the center line. A coating removing device for a coated pipe, characterized in that the cutting tool is moved in an arc in the direction of the cutting line of the circular arc of the coated pipe to peel off the coating, with the blade feeding device and the stripping device being pivoted around the axis.