JP2004202671A - Device for polishing long pipe inside surface - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for polishing an inside surface of a long pipe, which is applicable to precleaning for painting the inside of the long pipe vertically disposed and having inner diameters multistepwise varied. <P>SOLUTION: The device for polishing the inside surface of the long pipe is provided with at least a working part 100 to be freely inserted in the long pipe. The working part 100 comprises: a fixing means A for fixing to the inside surface, which is formed of a working rod 1a housed in a cylinder 1 and movable forward and backward, and clamping arms 2 and 3 to be developed and folded by the forward and backward movement of the working rod 1a; and a rotatively brushing means B developably mounted on the end of the fixing means A. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an apparatus for polishing an inner surface of a long pipe such as a transmission line support pipe.
[0002]
[Prior art]
The inner and outer surfaces of the transmission line support pipe are subjected to a rust-proof treatment by galvanizing with zinc. However, since the surface is exposed to the weather for many years, the rust-preventing ability of the surface is reduced, so that the rust-proof coating is periodically applied. And, in order to obtain the effect as a rust preventive coating, the coated surface needs to be applied in a state of being in direct contact with the base material of the pipe, and at the time of the coating, polishing is performed to clean the surface. .
[0003]
However, the outer surface of the pillar pipe is a horn, and the inner surface of the pillar pipe is painted by flowing paint from the top opening of the pipe without preliminary polishing because there is no appropriate polishing means, and the rust prevention effect is present. The work itself is useless.
[0004]
Therefore, for example, diversion of a device for internal polishing of a steel pipe applied in the general steel field as described in Patent Documents 1 to 3 has been considered, but its length extends to several tens of meters. In addition, it cannot be used for a high-voltage transmission line support pipe having a variable inner diameter, and it is necessary to develop a unique device capable of coping with such conditions.
[0005]
[Patent Document 1]
JP-A-7-88768
[Patent Document 2]
JP 2001-138240 A
[Patent Document 3]
JP 2001-191244 A
[Problems to be solved by the invention]
The present invention provides an apparatus for polishing the inner surface of a long pipe that can be applied to cleaning for pretreatment of coating on the inner surface of a long pipe that is disposed in a vertical position and whose inner diameter changes in multiple stages.
[0009]
[Means for Solving the Problems]
The present invention is a polishing apparatus for polishing an inner surface of a long pipe in which at least an operating part can be freely inserted into a long pipe, wherein the operating part comprises an operating rod housed in a cylinder and an advanceable and retractable operating rod. A fixing means for fixing to the inner surface of the pipe, comprising a clamp arm which is deployable and foldable, and a deployable rotating brush means attached to a tip of the fixing means.
[0010]
As the operating portion, various hydraulic driving, any driving means such as electric driving means can be used, but in consideration of application to remote areas such as high-voltage wire tower, the operating means is an air cylinder, an air motor or the like. It is convenient to apply the air driving means from the viewpoint of workability and maintainability.
[0011]
The clamp arm is for positioning the operating portion within the pipe, and for stable positioning, a plurality of stages are provided in the vertical direction of the operating portion, and at each stage along the circumferential direction of the operating portion. It is necessary to provide more than one. In particular, when using a press-fit butt type joint that causes a large step on the inner surface of the pipe, in order to reliably position the operating part when the clamp arm crosses the step, two or more steps located in a part other than the step are required. It is preferred that the working part is supported and positioned by the clamp arm. Therefore, the number of stages of the clamp arm is preferably three or more in the vertical direction of the operating portion. However, when the number of stages is increased, there is a problem that the operating portion becomes long and bulky. Therefore, as a result of experimental verification, it was found that the optimal number of clamp arms was three or four.
[0012]
Further, the number of clamp arms in the circumferential direction of the operating portion in each stage is preferably as large as possible for stable positioning of the operating portion. However, if the number of the clamp arms in each stage is too large, there is a problem that it is difficult to expand and fold the clamp arms. Therefore, as a result of experimental verification, it has been found that it is optimal to provide four clamp arms at equal intervals in the circumferential direction of the operating portion in each stage.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the embodiment of the present invention, the height of 50 m, the inner diameter of the top pipe is 140 mm at the insertion port, the inner diameter of the lower pipe is 306 mm, the polished length is 13000 mm from the bottom, the rust prevention coating of the support pipe of the power transmission tower. An embodiment shown in FIGS. 1 to 3 which is applied to inner surface polishing will be described.
[0014]
FIG. 1 is a perspective view showing the appearance of the polishing apparatus of the present invention before it is inserted into a support pipe. As shown in FIG. 1, the working part 100 of the polishing apparatus of the present invention includes a fixing means A for fixing to the inner surface of a pipe mainly composed of upper and lower two-stage clamp arms 2 and 3 which can be deployed and folded by an air cylinder 1. An air motor 4 as a rotary driving device attached to the tip of the fixing means A, and a rotating brush means B mainly comprising a rotating brush 5 connected to the tip.
[0015]
FIG. 2 is a sectional view showing the structure of the fixing means A and the rotating brush means B. First, the configuration of the fixing means A will be described with reference to FIGS. As shown in FIG. 1, three clamp arms 2 are arranged at intervals of 120 degrees in the circumferential direction of the rod-shaped main body 6, and the base end of each clamp arm 2 is pivotally supported on the rod-shaped main body 6. This allows for unfolding and folding. At the tip of each clamp arm 2, an engagement portion 2 a made of a leaf spring and having a tip curved toward the rod-shaped main body 6 is provided. The configuration of the clamp arm 3 is the same as that of the clamp arm 2. The base end of each clamp arm 3 is pivotally supported by the rod-shaped main body 6, and the distal end is provided with an engaging portion 3 a. The clamp arm 2 and the clamp arm 3 are arranged at positions where they are aligned in the vertical direction, and are connected by the first link pieces 7. Both ends of the first link piece 7 are rotatably supported by the clamp arms 2 and 3.
[0016]
The cylindrical support 8 is connected to the base end of the rod-shaped main body 6, and the air cylinder 1 is connected to the base end of the cylindrical support 8. The proximal end of the operating rod 1a of the air cylinder 1 is housed in the cylinder body 1b so as to be able to advance and retreat, and the distal end is housed in the cylindrical support 8. The operating rod 1a is normally urged by a coil spring (not shown) so as to be in the advanced position as shown in FIG. 2, and operates the air cylinder solenoid valve 18 shown in FIG. By introducing air into the cylinder main body 1b from the air inlet 1c, the air is retracted rightward in FIG. A connecting tool 10 is connected to the tip of the operating rod 1a via a boss 9. The connecting tool 10 is disposed in a slit 8a formed in the cylindrical support 8, and moves in the slit 8a as the operating rod 1a advances and retreats. Further, the base end of the second link piece 11 is rotatably supported by the connecting tool 10, and the distal end of the second link piece 11 is rotatably supported by the clamp arm 2. .
[0017]
Next, the configuration of the rotating brush means B will be described. As shown in FIG. 2, an air motor 4 is connected to the tip of the rod-shaped main body 6, and a rotary brush 5 is connected to a rotary drive shaft 4a at the tip. The air motor 4 is driven to rotate by operating the air motor solenoid valve 19 shown in FIG. 1 to introduce air from the air compressor 20 through the air inlet 6a provided in the rod-shaped main body 6 and the air passage 6b. I do. The air motor 4 is housed in a motor box 13 whose base end is fixed to the rod-shaped main body 6 via a flange 12. A bearing box 16 is connected to a distal end of the motor box 13 via two flanges 14 and 15. The inner diameter of the flange 14 is formed smaller than the outer diameter of the air motor 4.
[0018]
In the bearing box 16, a connecting portion 5a of the rotary brush 5 connected to the rotary drive shaft 4a is housed so as to contact the bearing 16a. Thus, the connecting portion 5a rotates smoothly while contacting the bearing 16a with the rotation of the rotary drive shaft 4a. The four brush bodies 5b are connected to the connecting portion 5a at 90-degree intervals in the circumferential direction so as to be deployable and foldable. The brush main body 5b includes an arm 5c and a brush 5d, and a base end of the arm 5c is rotatably supported by the connecting part 5a so that the brush main body 5b can be expanded and folded. The brush part 5d is rotatably connected to the tip of the arm part 5c. The bearing box 16 is covered by an inner guide 17. The inner guide 17 has such a size that its maximum outer diameter portion projects slightly outward from the engaging portions 2a and 3a in a state where the clamp arms 2 and 3 are folded. That is, when the clamp arms 2 and 3 are folded, the inner guide 17 projects outward. The inner guide does not necessarily need to cover the entire bearing box 16 and may be formed in a cage shape by a plate-shaped guide piece.
[0019]
Hereinafter, a method of using the polishing apparatus of the present invention will be described.
[0020]
First, the working part 100 is inserted from the insertion opening (140 mm in inner diameter) of the top pipe. At this time, the operating rod 1a of the air cylinder 1 is in a state of being advanced as shown in FIG. 2 by the urging force of the coil spring as described above. In this state, as shown by the solid line in FIG. 2, the clamp arms 2 and 3 are folded, and the outer diameter of the entire operation part 100 is smaller than the inner diameter of the top pipe P1, so that the operation part 100 is connected to the top pipe P1. Can be inserted from the insertion opening (inner diameter 140 mm). Next, the operating part 100 is lowered to the lower end of the lower pipe P2 (306 mm in inner diameter). At this time, since the inner guide 17 projecting outward most abuts against the inner surface of the pipe, the distal ends of the clamp arms 2 and 3 are not caught on the inner surface of the pipe, and the lowering of the operating portion 100 is not hindered. After the descent, air is introduced into the cylinder main body 1b of the air cylinder 1 to retreat the operating rod 1a rightward in FIG. Along with this, the second link piece 11 connected to the operating rod 1a also retreats, and the clamp arm 2 is deployed as shown by a broken line in FIG. Since the clamp arm 3 is connected to the clamp arm 2 by the first link piece 7, the clamp arm 3 is deployed in conjunction with the clamp arm 2. When the clamp arms 2 and 3 are deployed, the engaging portions 2a and 3a at the tips thereof engage with the inner surface of the lower pipe P2, and the operating portion 100 is positioned in the lower pipe P2.
[0021]
In this state, the air motor 4 is driven by the air from the air compressor (air source) 20 by operating the air motor electromagnetic valve 19 shown in FIG. 1 to rotate the rotary drive shaft 4a. Along with this, the rotating brush main body 5b connected to the connecting portion 5a of the rotating brush 5 also rotates, and expands outward by its centrifugal force. As a result, the brush portion 5d rotates while being in contact with the inner surface of the lower pipe P2, and the inner surface of the lower pipe P2 is polished.
[0022]
FIG. 3 is a diagram showing the operation state. In this state, the lower pipe P2 and the inner surface of the pipe continuous therewith are polished while raising the operating portion 100. At this time, even if there is a step on the inner surface of the pipe, the engaging portions 2a and 3a at the distal ends of the clamp arms 2 and 3 are made of a leaf spring and have a shape curved toward the rod-shaped main body 6. You can easily get over the steps. Further, since the connecting portion 5a of the rotary brush 5 connected to the rotary drive shaft 4a of the air motor 4 is housed in the bearing box 16 and rotates while contacting the bearing 16a, excessive load is applied only to the rotary drive shaft 4a. However, damage to the rotary drive shaft 4a can be prevented. Further, since the air motor 4 is housed in the motor box 13 connected to the rod-shaped main body 6, even if the connection between the air motor 4 and the rod-shaped main body 6 is disconnected, the air motor 4 is kept in the motor box. It stays in 13 and does not fall below it.
[0023]
In the embodiment, the clamp arms are provided in two upper and lower stages, but may be provided in three upper and lower stages or more. In that case, the clamp arms of each stage may be connected by the same link piece as the first link piece 7 in the embodiment, and may be operated in conjunction with each other. Further, in the embodiment, initially, three clamp arms are arranged at intervals of 120 degrees in the circumferential direction of the rod-shaped main body 6 in each stage, but four clamp arms are arranged at intervals of 90 degrees in the circumferential direction of the rod-shaped main body 6. The operating part can be positioned more stably in the pipe.
[0024]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the polishing apparatus of this invention, even if it is a long pipe whose length is several tens of meters and an inside diameter changes in multiple steps, the polishing process for cleaning the inner surface can be performed smoothly. .
[Brief description of the drawings]
FIG. 1 is a perspective view showing the appearance of a polishing apparatus of the present invention before being inserted into a support pipe.
FIG. 2 is a sectional view showing a configuration of a fixing means and a rotating brush means in the polishing apparatus of the present invention.
FIG. 3 is a perspective view showing the appearance of the polishing apparatus of the present invention inserted into a support pipe.
[Explanation of symbols]
Reference Signs List 100 Operating part of polishing apparatus A Fixing means of polishing apparatus B Rotating brush means of polishing apparatus 1 Air cylinder 1a Operating rod 1b Cylinder main body 1c Air inlets 2, 3 Clamp arms 2a, 3a Engaging section 4 Air motor (rotary driving device) )
4a Rotary drive shaft 5 Rotary brush 5a Connecting part 5b Brush body 5c Arm part 5d Brush part 6 Bar-shaped body 6a Air inlet 6b Air passage 7 First link piece 8 Cylindrical support 8a Slit 9 Boss 10 Connector 11 Second Link piece 12 Flange 13 Motor box 14, 15 Flange 16 Bearing box 16a Bearing 17 Inner guide 18 Solenoid valve for air cylinder 19 Solenoid valve for air motor 20 Air compressor (air source)

Claims (6)

A polishing apparatus for an inner surface of a long pipe, at least an operation part of which can be freely inserted into a long pipe, wherein the operation part is capable of being extended and retracted by an advanceable / retractable operation rod housed in a cylinder and the advance / retreat of the operation rod. An apparatus for polishing the inner surface of a long pipe, comprising: means for fixing to the inner surface of the pipe comprising a possible clamp arm; and rotating means attached to the tip of the fixing means. The polishing of the inner surface of a long pipe according to claim 1, wherein a plurality of clamp arms are arranged in a vertical direction of the operating portion, and a plurality of clamp arms are provided at each stage along a circumferential direction of the operating portion. apparatus. 2. The clamp arm according to claim 1, wherein the clamp arms are arranged in three or four stages in the vertical direction of the operating portion, and each stage is provided with four clamp arms at equal intervals along the circumferential direction of the operating portion. Polishing equipment for the inner surface of long pipes. The inner surface of a long pipe according to any one of claims 1 to 3, wherein the rotary brush means comprises a rotary drive device attached to a tip of the fixing means, and a rotary brush connected to a rotary drive shaft at the tip of the rotary drive device. Polishing equipment. A connecting portion of the rotary brush connected to the rotary drive shaft at the tip of the rotary drive device is rotatably housed in a bearing box connected to the distal end of the rotary drive device, and a plurality of rotary brush bodies are connected to each other. The plurality of rotating brush bodies are formed so as to be expanded outward by the rotation of the connecting portion and to be in rotational contact with the inner surface of the long pipe. Polishing device for elongating the inner surface of a long pipe according to Item 1. The polishing device for the inner surface of a long pipe according to any one of claims 1 to 5, wherein driving of the cylinder and the rotary driving device is performed by air.

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