JPH07299716A - Pipe inside projection removing device - Google Patents

Abstract

PURPOSE:To completely remove a projection such as a backing ring in a pipe body. CONSTITUTION:A pipe inside projection removing device comprises a front aligning mechanism 30 and a rear aligning mechanism 40 which have respective three extension/contraction legs 31, 41 capable of extending, aligning, and setting radially, a centering mechanism 90 which is attached to a rotary shaft 50 supported by both aligning mechanisms 30, 40 and detects the center, a grinding tool which is rotatably provided around the shaft center line of the rotary shaft 50 while being supported by both aligning mechanisms 30, 40, and a feed mechanism 80 which transfers the grinding tool at right angles to the shaft center line of the rotary shaft 50.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a means for removing a convex portion in a pipe such as a backing metal (back ring) attached to a welded joint portion of a pipe.

[0002]

2. Description of the Related Art When welding large-sized pipes installed in facilities such as power plants and plants, a backing metal is attached to the inside of the welded joint to perform welding. The gold remains attached to the inside of the tube at the weld joint.

[0003]

Conventionally, the backing metal remains attached to the inside of the pipe as described above, but if the backing metal comes off and flows inside the pipe due to corrosion during operation, a serious accident will occur. There is a problem that it is desirable to remove the backing metal because it may occur.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain an in-tube convex portion removing device capable of completely removing an in-tube convex portion such as a backing metal.

[0005]

SUMMARY OF THE INVENTION An in-pipe convex portion removing device according to the present invention includes a front centering mechanism and a rear centering mechanism each having three telescopic legs that can be set to be telescopically adjusted in the radial direction. A centering mechanism that is attached to a rotating shaft that is supported by an aligning mechanism to detect the center, and a grinding tool that is supported by both of the aligning mechanisms and is rotatable around the axis of the rotating shaft. And a feed mechanism for moving the grinding tool in a direction perpendicular to the axis of the rotary shaft.

[0006]

The pipe convex portion removing device according to the present invention is temporarily installed in the pipe, and the centering mechanism attached to the rotary shaft supported by the front centering mechanism and the rear centering mechanism is rotated to detect and detect the center. Each of the two centering mechanisms to match the center
When the telescopic legs of the book are set to be telescopically adjusted in the radial direction, the rotation axis is set to the center line. If the grinding tool supported by these two centering mechanisms is rotated around the axis of the rotary shaft while being fed by the feed mechanism in the direction perpendicular to the axis of the rotary shaft, the grinding tool will be Abut and grind to remove. As a result, the inner surface of the pipe can be cut into an accurate circular shape.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1A and 1B show a device for removing a convex portion in a pipe according to an embodiment of the present invention, wherein FIG. 1A is a longitudinal sectional view, FIG. 1B is a lateral sectional view near a front centering mechanism, and FIG. It is a side view. In the figure, 10 is a pipe body such as a pipe having a different diameter. A backing metal 20 applied before welding is left on the inner peripheral surface of the pipe at the welded portion for connecting the step connection pipe and the normal pipe. This in-pipe convex portion removing device is an apparatus for eliminating an in-pipe convex portion such as the backing plate 20.

In the figure, 30 is a front centering mechanism and 40 is a rear centering mechanism, each having three telescopic legs 31, 41. The telescopic legs 31 and 41 are attached so as to extend radially from the center of the front centering mechanism 30 or the rear centering mechanism 40 at intervals of 120 degrees, and the telescopic legs 31 and 41 are applicable to pipes of various different diameters. As described above, various lengths are prepared, and the telescopic legs 31 and 41 can be adjusted and set by expanding and contracting the radial protruding length with a screw. Front centering mechanism 3
A rotary shaft 50 is provided through the center of the zero and rear centering mechanism 40. A centering mechanism 90 is attached to the rotating shaft 50, and an extendable and retractable protrusion 92 is provided on the centering mechanism 90 so as to extend in a direction perpendicular to the center line of the rotating shaft 50. Detects the distance from the center of the centering mechanism 90, that is, the center of the rotating shaft 50 to the tip of the protrusion 92.
Therefore, by rotating the rotary shaft 50 to change the direction of the protrusion 92, the tip of the protrusion 92 is brought into contact with the inner surface of the tubular body 10 or the backing metal 20, and the distance in each direction is detected to detect the center position. can do.

In the figure, reference numeral 60 is a grinder, and a rotary drive unit 62 of the grinder 60 is a grinder support frame 86.
The grinder support frame 86 is attached to the guide 8
It is provided on the entire rotating member 55 via 7 so as to be movable in the vertical direction in the figure. The right portion of the whole rotary member 55 in the figure is rotatably supported by the rear centering mechanism 40 by the whole rotary bearing 45, and is also supported by the front centering mechanism 30 via the rotary shaft 50. The rotation center line of the entire rotation member 55 is the rotation shaft 50.
It is the same as the rotation center line of No. 1 and connects the center of the front centering mechanism 30 and the center of the rear centering mechanism 40.

As the feed mechanism 80, a screw shaft 85 is provided on the entire rotary member 55 so as to be rotatable in the direction perpendicular to the center line (upper central portion in the drawing), and a large bevel gear 83 is fixed to the screw shaft 85. There is. A rotary drive shaft 81 is rotatably provided in the entire rotary member 55 in the axial direction, and a handle fitting portion 81c is formed at the right end of the rotary drive shaft 81 in the drawing so that a rotary drive handle can be attached. , Rotary drive shaft 8
A small bevel gear 82 meshing with the large bevel gear 83 is provided at the left end of the drawing of FIG.
Is stuck. A male screw is formed on the upper portion of the screw shaft 85 in the drawing, and a screw hole to be screwed into the male screw of the screw shaft 85 is formed and screwed into the upper side member of the grinder support frame 86 in the drawing. Therefore, the grinder support frame 86 that supports the grinder 60 is supported by the entire rotating member 55 via the screw shaft 85, and is rotated by the rotary drive shaft 81.
When is rotated, the grinder support frame 86 is a mechanism that moves in the vertical direction in the figure.

A suction pipe system 70 has a suction port opened near the rotary grindstone 61 of the grinder 60, and the right side of the drawing is connected to a suction pump or the like (not shown). Further, a power source or a compressed air source (not shown) is connected to the right side of the drawing to the rotary drive unit 62 of the grinder 60.

Next, the operation of the embodiment shown in the figure will be described. First, a procedure for installing the in-tube convex portion removing device in a desired tube will be described. Each of the three telescopic legs 31 and 41 of the front centering mechanism 30 and the rear centering mechanism 40 is inserted into the tubular body 10 in a shortened state, and the protrusion 92 of the centering mechanism 90 is inserted.
Axial position is determined so that it is located on the backing metal 20 to be deleted, and each of the three telescopic legs 31 and 41 is extended,
The tip is brought into contact with the inner surface of the tubular body 10 and temporarily provided at the approximate center position. Next, the rotating shaft 50 is rotated to rotate the centering mechanism 90.
By changing the angular position of the projecting member 92 in three or more directions, the distance from the center in each direction to the inner peripheral surface of the backing plate 20 is detected, and the three telescopic legs 31 are moved according to the difference in each distance. Turn to change the amount of protrusion and adjust the center. Further, when the centering mechanism 90 is rotated around the center line, the three 41 are expanded and contracted so that the tip of the protrusion 92 extends over the entire circumference at the axial center of the inner peripheral surface of the backing plate 20. And adjust. As described above, the centerlines of the rotary shaft 50 and the entire rotary member 55, that is, the centerlines of the in-tube convex portion removing device are set by the adjustment using the telescopic legs 31 and 41. Further, the axial position of the rotary grindstone 61 of the grinder 60 is the centering mechanism 90.
Since it is provided so as to coincide with the axial position of, the axial position of the rotary grindstone 61 coincides with the axial position of the backing plate 20.

Next, electric power or compressed air is sent to the rotary drive unit 62 of the grinder 60 that has been pulled up toward the center line to rotate the rotary grindstone 61, and the feed operation is performed so as to lower it in the figure. The feed operation is performed by the handle fitting portion 81.
When the handle is fitted to c and the rotary drive shaft 81 is rotated to rotate the screw shaft 85 from the small bevel gear 82 via the large bevel gear 83, the grinder support frame 86 of the grinder support frame 86 screwed to the male screw of the screw shaft 85 is rotated. A downward force is applied to the screw holes to push down the grinder support frame 86, and the grinder 6 attached to the grinder support frame 86 is pushed down.
Push 0 down. When the rotating grindstone 61 of the grinder 60 contacts the backing plate 20, the inner peripheral surface of the backing plate 20 is ground. By grinding the backing metal 20 over the entire circumference while rotating the entire rotating member 55 and rotating the grinder 60, the backing metal 20 can be completely removed by grinding the backing metal 20.

After the grinding and removing of the backing metal 20 is completed, the rotary drive shaft 81 is rotated to pull up the grinder 60 to the upper side of the drawing, and the telescopic legs 31 and 41 are shortened to take out the pipe convexity removing device. During this grinding operation, if the grinding dust is sucked and collected by the suction pipe system 70, environmental pollution can be prevented.

Although the grinder 60 is used as the grinding tool in the drawings and the description of the embodiment, the grinder 6
Instead of 0, a tool such as a portable flat milling cutter can be attached to the grinder support frame 86 and used. Further, the design of the feeding mechanism 80 and the like can be appropriately changed.

[0016]

As described above, according to the present invention, the center line is set by the centering mechanism and the both-centering mechanism, and the grinding tool is ground while rotating around the center line. It is possible to completely remove the convex portion in the pipe and machine it to an accurate inner surface of the cylinder.

[Brief description of drawings]

1A and 1B show a device for removing a convex portion in a pipe according to an embodiment of the present invention, wherein FIG. 1A is a longitudinal sectional view, FIG. 1B is a lateral sectional view near the front centering mechanism, and FIG. It is a side view.

[Explanation of symbols]

10: tubular body, 20: back metal, 30: front centering mechanism,
31: telescopic leg, 40: rear centering mechanism, 41: telescopic leg,
50: rotating shaft, 55: whole rotating member, 60: grinder, 61: rotating grindstone, 70: suction pipe system, 80: feed mechanism, 90: centering mechanism, 92: protrusion.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Katoyo Yoshida 7-1-14 Wadamiyadori, Hyogo-ku, Kobe Nishibishi Engineering Co., Ltd.

Claims (1)

[Claims] 1. A front centering mechanism and a rear centering mechanism each having three telescoping legs that can be set to expand and contract in a radial direction, and a center attached to a rotary shaft supported by the both centering mechanisms. A centering mechanism for detecting, a grinding tool supported by the both aligning mechanisms and rotatably provided around the axis of the rotary shaft, and the grinding tool perpendicular to the axis of the rotary shaft. In-tube convex part removal device consisting of a feed mechanism that moves in different directions.