JPH0650123Y2 - Buried pipe polishing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a buried pipe polishing device, and more particularly to a device for polishing a welded portion of a pipe buried in the ground such as a gas conduit from the inside of the pipe. Is.

[Prior Art] Generally, since most of gas conduits are buried in the ground, it is difficult to directly grasp the state thereof, and efficient maintenance is not always easy. If you can grasp the state of these gas conduits buried,
It is extremely effective from the viewpoint of planned preventive maintenance, and for this reason, a gas pipe inspection robot has been developed that inspects the pipe without exposing the gas pipe (Reference Robot No. 5).
9, P72, Japan Industrial Robot Manufacturers Association, Date 1987-9-
1). By using this gas conduit inspection robot, it becomes possible to detect the polishing portion of the buried pipe, and in this case, the buried pipe is dug up to polish and repair the polishing portion.

[Problems to be solved by the invention] However, in the conventional buried pipe polishing repair, the buried pipe must be dug up in order to carry out the repair, so not only the heavy equipment cost is increased but also in a short time. There is a problem that it is difficult to efficiently excavate, inspect, and repair the buried pipe due to traffic conditions, and we would like to carry out polishing repair from the inside of the buried pipe.

There is a device that polishes the welded part from the inside of the pipe (Reference. Japan Gas Association magazine vo1.35 No.10 P74 to P81 inner surface automatic welding method, 1982), but this device is for large diameter straight pipes and cannot be applied to small diameters. There was a problem. In addition, this device is not suitable for curved pipes, and it is almost impossible that it is composed of only straight pipes regardless of the piping system of any equipment, and bend pipes such as bends, assembles and miter bends are everywhere. Therefore, there is a problem that it is difficult to polish the welded portion to be polished from the inside of the pipe.

Therefore, the present invention has been made to solve the above-mentioned problems, and is used not only for large-diameter embedded pipes but also for small-diameter embedded pipes, and is used not only for straight pipes but also for curved pipes, and from the inside of the pipes. It is an object of the present invention to provide a buried pipe polishing apparatus that can polish a welded portion.

[Means for Solving the Problems] In order to achieve the above object of the present invention, a polishing device main body that moves in an embedded pipe by pulling a rope or the like, and radially provided at front and rear parts of the main body at equal intervals in a radial direction. And a wheel whose tip is formed in a spherical shape, and a center of the wheel that is expandable and contractible in the pipe radial direction, and after the body moves to the weld polishing location, the tip is removed from the wheel. A fixing mechanism that extends toward the inner wall of the pipe and fixes the main body inside the pipe, and is provided in the main body, and the pipe axial direction, the pipe radial direction, and the pipe circumferential direction are remotely controlled to polish and repair the polishing location. The polishing mechanism is movable in three directions.

[Operation] With the above configuration, the main body of the polishing apparatus for a buried pipe moves inside the buried pipe by being pulled by a rope or the like. Since the main body does not require self-propelled power as described above, it is not necessary to mount an electric motor or the like associated therewith, the size can be reduced, and it can be applied to a small diameter buried pipe. Also, since wheels are provided radially at equal intervals in the front and rear of the main body and the tip of this wheel is formed into a spherical shape, even if the buried pipe is bent, it is difficult to move at that part. Without moving easily in the buried pipe.

Then, the polishing apparatus main body is pulled and moved to the welding portion polishing portion by the winding amount of the rope and the like, and after the movement, is fixed in the pipe by the fixing mechanism. Since this fixing mechanism is formed so as to be capable of expanding and contracting in the central portion of the wheel, the main body can be fixed inside the pipe by the method of extending the tip end portion outward from the wheel, and the fixing mechanism. Since it is formed as a part of the wheel, the fixing mechanism can be downsized. in this way,
Since the fixing mechanism radially provided at equal intervals extends to fix the main body, the center of the main body substantially coincides with the axial center of the pipe. After fixing, the polishing mechanism is moved by remote control in three directions of the pipe axis direction, the pipe radial direction and the pipe circumferential direction, and the polishing mechanism is positioned at the welding portion polishing portion, so that the polishing portion is polished and repaired. . In this way, since the polishing mechanism is movable in three directions of the pipe axis direction, the pipe radial direction, and the pipe circumferential direction,
Polishing and repair of the welded portion can be easily performed.

[Embodiment] A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the main body 2 of the buried pipe polishing apparatus 1 is formed of a hollow shaft. The rope 3 is inserted through the axis of the main body 2, and a carriage clamp 4 is provided in the main body 2 in front of the rope 3 in the pulling direction A. The clamp 4 fixes the main body 2 to the rope 3. In the front and rear portions of the main body 2, three axles 5 are radially arranged in the radial direction at 120 ° intervals in the circumferential direction. Wheels 7 are rotatably provided on these axles 5 via wheel bearings 6 so as to surround the axles 5, and the wheels 7 are configured to rotate in the radial direction. The front ends of these wheels 7 are formed in a spherical shape, and the three wheels 7 ahead of the rope 3 in the pulling direction A are front wheels 8 and the rear wheels 9 are rear wheels 9.
When the main body 2 is guided and moved in the buried pipe 10 by the traction force of, the wheels 7 come into contact with the inner wall of the pipe 10 and rotate, and the rotation of the wheels 7 and the spherical shape prevent the inner wall surface of the pipe 10 from being damaged. ing.

From the center to the tip of the center of each wheel 7, the fixing mechanism 11
The piston 12 constituting the above is provided so as to be expandable and contractible in the radial direction of the pipe 10. This piston 12 moves the pipe 10 by the pressure of air.
The pipe 10 is moved radially outward, and when the air pressure is lost or weakened, the pipe 10 is moved radially inward by the biasing force of the piston return spring 13. That is, the piston 12 has a tip portion formed as a part of the wheel 7, and the pipe 10 is compressed by air pressure.
The polishing apparatus body 2 is configured to be fixed in the pipe 10 by moving radially outward, that is, by causing the tip end portion to extend outward from the wheel 7 and contact the inner wall surface of the pipe 10. .

Further, the polishing mechanism 14 for polishing the welded portion by remote control is provided with a grinder 15 movably provided in three directions: the axial direction of the pipe 10, the radial direction of the pipe 10 and the circumferential direction of the pipe 10. A cylindrical rotating frame 16 serving as a base of the mechanism 14 is rotatably provided on the outer periphery of the main body 2 behind the front wheel 8 via a bearing 17. The rotating frame 16 for moving the grinder 15 in the circumferential direction of the tube 10 is configured to rotate ± 200 °. The rear wheel 9 is attached to the rotary frame 16 so that the rear wheel 9 is rotated together with the rotary frame 16. A swivel gear 18 is attached to the front part of the rotary frame 16, and a swivel pinion 19 is meshed with the swivel gear 18. This swivel pinion 19 is a swivel motor that can rotate forward and backward.
It is connected to a rotary shaft of 20 and is configured to move the grinder 15 in the circumferential direction of the tube 10 by driving the turning motor 20.

Further, as shown in FIG. 2, the head frame which is slidable in the axial direction of the tube 10 is provided on the rotary frame 16 between the front and rear wheels 8 and 9.
21 and a grinder mounting base 22 are integrally provided.
The grinder mount 22 is for moving the grinder 15 in the radial direction of the pipe 10, and includes three lifting guide rods.
The lift guide rod 23 is supported by the lift frame 23, and the lift guide rod 23 is inserted into the head frame 21 and connected to the lift lock piece 24. In addition, the head frame 21 has two lifting screw rods.
25 are inserted, one end of each of the lifting screw rods 25 is connected to the grinder mounting base 22, and the connecting portion is formed as a lifting feed screw 26. A lifting synchronous sprocket 27 is attached to the other ends of the lifting screw rods 25, and a chain is attached to these two lifting synchronous sprockets 27.
28 have been passed over. Further, an elevating gear 29 is attached to one elevating screw rod 25.
The lifting pinion 30 is meshed with. This lifting pinion
Reference numeral 30 is connected to a rotating shaft of a lift motor 31 capable of rotating in the forward and reverse directions, and is configured to drive the lift motor 31 to move the grinder 15 in the radial direction of the tube 10.

Further, as shown in FIGS. 2 and 3, the grinder 15
The head frame 21 that moves the tube in the axial direction of the tube 10 is attached to the rotary frame 16 via two forward and backward guide rods 32, a guide support bracket 33, and a motor support bracket 34, and the guide support bracket 33 and the motor are attached. It is meshed with the forward / backward feed screw 35 supported by the support bracket 34. A forward / reverse rotation motor 36 supported by a motor support bracket 34 and capable of rotating in the forward and reverse directions is connected to one end of the forward / backward movement screw 35, and the forward / backward movement motor 36 drives the grinder 15 in the axial direction of the tube 10. It is configured to move.

As shown in FIGS. 1 and 2, the grinder 15 is attached to the grinder mounting base 22 along the axial direction of the pipe 10, and the front portion of the grinder 15 is located on the rear wheel 9 side and the rear portion is The pipe 10 is located radially outward. Its grinder 15
The center of the grinder 15 is an elastic member such as rubber.
37, the rear part is attached to the grinder mounting base 22 via a pin 38. A grindstone 39 which is rotated by air is attached to the tip of the grinder 15. In addition, on one side front part of the grinder 15, while monitoring the state where the grinder 15 moves by remote control, the grinding state of the welding part polishing part is being monitored by the grinder 15.
The V-camera 40 has a camera light 41 on the other side of the front side, which illuminates the polished portion of the weld in the pipe 10 and the front of the grinder.
Are installed respectively. Furthermore, a sound collecting microphone (not shown) is attached to the grinder 15.

Next, the operation of this embodiment will be described.

When polishing and repairing the bead sagging of the buried pipe 10 such as a gas conduit, the buried pipe polishing device 1 moves the rope 3
It is moved in the buried pipe 10 by traction such as, and is guided to the welded portion polishing location. That is, the polishing device 1 is pulled by the winding amount of the rope 3 to an approximate position of the detected welding portion polishing position. When the polishing device 1 approaches the welding part polishing part, the polishing device 1 is pulled while looking at the ITV camera 40 provided on the polishing device 1, and when the polishing device moves to an appropriate position of the welding part polishing part, the rope Stop pulling 10th magnitude. Then, as shown in FIG. 4, the pistons 12 of the wheels 7 radially provided on the front and rear portions of the main body 2 at intervals of 120 ° in the radial direction of the main body 2 are urged by the piston return spring 13 by the air pressure. Against this, the polishing device 1 is fixed in the pipe 10 by moving it outward in the radial direction of the pipe 10 (the tip end of the piston 12 is extended outward from the wheel 7 and brought into contact with the inner wall of the pipe 10). First, the pistons 12 of the two wheels 7 out of the three wheels 7 of the front wheels 8 are first used, and the pistons 12 are centered to the stroke end. Press and fix with the remaining piston 12. That is, the pressing force of the remaining piston 12 is reduced so that the core (piston 12) does not move while the polishing apparatus 1 is operating. Then, the rear wheels 9 are operated similarly to the front wheels 8. As a result, the polishing device 1 is fixed in the tube 10.

After the fixing, the air of each wheel 7 of the rear wheel 9 is removed, and the piston 12 is moved inward in the radial direction by the urging force of the piston return spring 13. As a result, the polishing device 1 is fixed only by the front wheel 8. Then, while watching the ITV camera 40, the grindstone 39 of the grinder 15 is moved in the three directions of the tube 10 axial direction, the pipe 10 radial direction and the circumferential direction of the pipe 10 by remote control, and the grindstone 39 is aligned with the welded portion polishing location. . This is done by checking the welding line with the ITV camera 40 and aligning it with the whetstone 39 position. That is, in the tube 10 axis direction,
When the forward / reverse drive motor 36 is driven, the grinder mount 22 is moved together with the head frame 21 via the forward / reverse feed screw 35.
It will be moved in the 10-axis direction. Further, when the elevating motor 31 is driven in the radial direction of the pipe 10, the grinder mount is moved through the elevating pinion 30, the elevating gear 29, the elevating screw rod 25, the elevating synchronous sprocket 27 and the elevating feed screw 26.
22 will be moved in the radial direction of the pipe 10. In addition, tube 10
When the turning motor 20 is driven in the circumferential direction, the rotating frame 16 is rotated in the circumferential direction of the tube 10 via the turning pinion 19 and the turning gear 18.

Then, the grindstone 39 of the grinder 15 is aligned with the welding portion polishing portion, the grinding stone 39 is rotated by air, and the ITV camera 40, the camera light 41 and the sound collecting microphone are used to grasp the polishing state of the welding portion polishing portion. Will be repaired by polishing.
That is, since the ITV camera 40, the camera light 41, and the sound collecting microphone are attached to the front part of the grinder 15, it is possible to easily monitor the polishing section and grasp the polishing status. Further, during the grinding of the grinder 15, even if the load on the grinder 15 suddenly increases, the grinder 15 is not stopped because it is supported by the elastic member made of rubber or the like. Furthermore, since I used an air grinder 15,
A larger output is obtained as compared with the electric type, and burnout of the grinder 15 is eliminated due to overload.

Further, the air and the power source of the polishing apparatus are supplied from another apparatus or the like. For example, like the buried pipe welding repairing device proposed by the present applicant, the positioning pipe, the grinding carriage, the welding carriage, the driving carriage, and the power supply carriage constitute the buried pipe welding repairing equipment. Then, the device (carriage) is configured by each element device, and the device is towed by a rope or the like, so that self-propelled power is not required and the accompanying electric motor does not have to be mounted on the device. Will be miniaturized.

Therefore, the polishing apparatus 1 in the buried pipe is pulled by the rope 3 or the like and guided and moved into the buried tube 10, and the fixing and polishing work is performed by remote control. Therefore, the polishing apparatus 1 can be downsized, and the gas conduit, etc. The pipe 10 can be applied to a small mouth type such as φ200 mm, and not only the large mouth type but also the small mouth type embedded pipe 10 can polish and repair the welded portion to be polished from the inside of the pipe 10.

In addition, it is unlikely that the piping system of any equipment will be composed of only straight pipes, and curved pipes such as elbows, assembles, and miter elbows are everywhere, but the main body of the polishing apparatus 1 Since the front ends of the wheels 7, which are radially provided at equal intervals in the radial direction on the front and rear parts of 2, are formed in a spherical shape, even if the buried pipe 10 is bent, it is difficult to move at that part. Without moving easily in the buried pipe 10. Therefore, the polishing apparatus 1 can easily pull and move not only in the straight pipe but also in the curved pipe and does not damage the inner wall of the pipe.

Further, the grinder 15 is arranged in the axial direction of the pipe 10, the radial direction of the pipe 10, and
Since it can move in three circumferential directions, even if a welded part is found on a curved pipe, the grinder will be moved to the welded part.
15 can be easily adjusted and the welded part of curved pipe can be polished and repaired.

Furthermore, since the pistons 12 provided at equal intervals in the circumferential direction of the polishing apparatus main body 2 extend to fix the main body 2 in the pipe 10, the center of the main body 2 should always substantially coincide with the axis of the pipe 10. Therefore, the work of polishing the welded portion of the pipe 10 is facilitated. Further, when the grindstone 39 of the grinder 15 is positioned at the welding portion polishing position, the rear wheel 9 rotates together with the rotating frame 16, so that the hose, the cable, etc. do not interfere with the rear wheel 9. Therefore, there is no risk of a hose, a cable, or the like being entangled with the polishing apparatus 1 and causing a failure. Further, since the fixing mechanism 11 is formed by the piston 12 that is provided at the center of the wheel 7 so as to be able to expand and contract, the main body 2 is fixed in the pipe 10 by extending the tip end portion from the wheel 7 to the outside. Moreover, since the fixing mechanism 11 is formed as a part of the wheel 7, the fixing mechanism 11 can be downsized.

[Effects of the Invention] Since the present invention is configured as described above, it has the following effects.

(1) Since it is pulled by a rope or the like and guided and moved to the polishing part of the welded part in the buried pipe, and the fixing and polishing work is performed by remote control, the polishing device in the buried pipe can be downsized, and not only large diameter but also small size. Even with a buried pipe having a caliber, it is possible to polish a welded portion to be polished from the inside of the pipe, and it is possible to easily move not only in a straight pipe but also in a curved pipe. Therefore, the buried pipe polishing apparatus according to the present invention is versatile.

(2) Since the fixing mechanism is provided in a part of the wheel so as to be able to extend and contract, and is formed as a part of the wheel, the size of the fixing mechanism can be reduced.

(3) Since the polishing mechanism of the buried pipe polishing device is movable in three directions: pipe axis direction, pipe radial direction, and pipe circumferential direction, not only straight pipes but also welded portions of curved pipes are polished from inside the pipe. Can be repaired.

[Brief description of drawings]

1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line of FIG. 1, FIG. 3 is a partial sectional side view showing an embodiment of the present invention, and FIG. FIG. 3 is a front view showing a pulled state and a fixed state of the present invention. In the figure, 2 is a main body, 3 is a rope, 10 is a buried pipe, 11 is a fixing mechanism, and 14 is a polishing mechanism.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takashi Sakoma 4-1-2, Hiranocho, Chuo-ku, Osaka City, Osaka Prefecture Osaka Gas Co., Ltd. (72) Inventor, Isa Yamada 5-chome, Takada-cho, Mizuho-ku, Nagoya 2-8 (72) Inventor Toshio Kojima 3-1-15-1 Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries Ltd. Tokyo Second Factory (72) Inventor Akira Tanaka 3-1-15-1 Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries Co., Ltd. Tokyo Second Factory (56) References Actual Public Showa 57-7479 (JP, Y1) Actual Public Showa 62-31241 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A polishing apparatus main body which moves in an embedded pipe by pulling a rope or the like, and wheels which are radially provided at front and rear parts of the main body at equal intervals in a radial direction and whose tip portions are formed into a spherical shape. It is provided in the center of the wheel so that it can expand and contract in the pipe radial direction.
After the main body moves to the welded part polishing part, the tip part extends outward from the wheel and contacts the inner wall of the pipe to fix the main part inside the pipe, and the main body is provided with the fixing mechanism, and the polishing part is polished and repaired. In order to do so, a polishing mechanism that is movable by remote control in three directions of the pipe axial direction, the pipe radial direction, and the pipe circumferential direction is provided.