JPH10305254A - Coating film stripping device for inside surface of large diameter pipe line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remarkably save manpower necessary for stripping work of a coating film on the inside surface of a large diameter pipe line and to safely execute the work without scratching the inside surface of the pipe line. SOLUTION: This coating film striping device for inside surface of large diameter pipe line is constituted so that an expansion pole 11 is supported so as to be able to adjust the height at the center of the front part of a self- traveling truck 2 capable of travelling in the large pipe line by an air motor drive an arm 14 rotating in the vertical plane perpendicular to the travelling direction of the self-traveling truck 2 by an air motor drive is supported on the upper end part of the expansion pole 11, further a cap like cover 72 is provided at the tip end part of the arm 14, a freely movable caster 93 provided on the peripheral part of the cover 72 is rolled on the inside surface of the large diameter pipe line, a nozzle 70 rotating in a plane perpendicular to the arm 14 by an air motor is provided in the cover 72 and a super high pressure water is ejected from the nozzle 70 toward the inside surface of the large diameter pipe line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for removing a coating film (lining) on the inner surface of a large-diameter pipe.

[0002]

2. Description of the Related Art For example, in a large-diameter pipeline for taking seawater for cooling in a thermal power plant or a nuclear power plant, a tar epoxy is lined to protect the inner surface thereof. Since the coating film (lining) is deteriorated due to aging, maintenance work for periodically peeling the coating film and repainting is required. Conventionally, the peeling of the coating film has been carried out exclusively by hand using the sandblasting method, but the working environment is extremely poor and requires a great deal of labor. Also, in the stripping operation by sandblasting, there was a risk of damaging the inner surface of the pipeline, so that sufficient care was required.

[0003]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a large-diameter pipeline in which a large amount of labor can be saved in removing the coating film, and the work can be performed safely and without damaging the pipeline inner surface. It is.

[0004]

For this purpose, the present invention provides an apparatus for peeling a coating film on the inner surface of a large-diameter pipe, which is provided with a telescopic pillar at the front center of a self-propelled bogie that can travel in the large-diameter pipe by driving an air motor. Height adjustable support, supports an arm that rotates by an air motor drive in a vertical plane perpendicular to the traveling direction of the traveling carriage at the upper end of the telescopic column, and further has a cap-shaped tip at the end of the arm. A cover is provided, and a swivel caster provided on a peripheral portion of the cover is rolled on the inner surface of the large-diameter pipe, and a nozzle that rotates in a plane orthogonal to the arm by driving an air motor is provided in the cover. It is characterized by injecting ultra-high pressure water toward the inner surface of the large diameter pipeline. Further, the present invention is characterized in that, in the coating film peeling device for the inner surface of the large-diameter pipe, a vacuum hose is provided on the cover so that the water in the cover is suctioned by vacuum.
Further, the present invention is characterized in that, in the coating film peeling apparatus for the inner surface of the large-diameter pipe, the traveling of the self-propelled carriage, the rotation of the arm, and the rotation of the nozzle are each driven by an air motor.

[0005]

Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 4, reference numeral 1 denotes an inner diameter of 1700.
It is a pipeline for circulating water of mm to 3700 mm. The self-propelled vehicle 2 traveling in the pipeline 1 includes two front wheels 3 and 3 made of rubber tires and two rear wheels 4 and 4. Reference numeral 5 denotes an air motor fixed to the lower surface of the bogie to rotationally drive each of the wheels, and a rotary shaft 6 protruding in the front-rear direction from the air motor.
6 is connected to the gearboxes 7,7, and the front two wheels 3,3 and the rear two wheels 4,4 are connected to an axle projecting from both sides of the gearboxes 7,7.

Reference numerals 8, 8, 9, and 9 denote bearing members for rotatably supporting the front two wheels 3, 3 and the rear two wheels 4, 4 under the bogie. The front two wheels 3, 3 and the rear two wheels 4, 4 are As shown in FIG. 2, it is pivotally supported so as to form a front C-shape. That is, the front two wheels 3, 3 and the rear two wheels 4, 4 are provided with bearing members 8, 8, 9, 9 so that the bogie 2 is stably supported in the pipeline 1.
The shafts are supported at an angle of about 15 degrees with respect to the vertical plane,
The two wheels are pivotally supported so that the distance between the two wheels increases on the side of the ground contact portion. Further, as shown in a plan view of FIG. 4, the front two wheels 3, 3 support the axle in such a manner that the bearing members 8, 8 are inclined forward by about 3 degrees so that the interval between the front two wheels becomes narrower in front than in rear. On the other hand, the rear two wheels 4, 4 have their axles supported by the bearing members 9, 9 so as to be inclined backward by about 3 degrees so that the interval between the rear two wheels is smaller than the front.

A pillar receiving portion 10 is provided in the center of the upper front portion of the trolley 2, and a telescopic pillar 11 which can expand and contract upward is fitted into the pillar receiving portion. A pinion meshing with a rack tooth formed on one side of the telescopic column 11 is provided in the column receiving portion 10, and an end 12 of the pinion is provided.
The telescopic column 11 is moved up and down by rotating the pinion by fitting a handle to the shaft, so that the height of the support shaft 13 horizontally supported on the telescopic column 11 can be adjusted.

As shown in FIG. 5, a boss 15 at the base end of an arm 14 is rotatably fitted to the support shaft 13, and the arm 14 is rotatable in a vertical plane perpendicular to the traveling direction of the carriage 2. It is pivotally supported. Reference numeral 50 denotes an air motor fixed to the telescopic column 11 for rotating the arm 14, and a pinion 51 fixed to the output shaft of the air motor 50 is attached to a gear 52 fixed to the edge of the boss 15. Are engaged.

A water supply pipe 53 for supplying high-pressure water is inserted through the center of the support shaft 13, and a rotary joint 54 is provided at the tip of the water supply pipe 53, and a flexible joint connected to the rotary joint 54 is provided. High-pressure water can be supplied to a nozzle 70 described later via the hose 55. As shown in FIG. 6, an air supply path 56 and a drainage path 57 for compressed air are respectively formed in the support shaft 13, and the distal end of the air supply path 56 has an annular shape formed on the inner peripheral surface of the boss 15. Groove 5
An air supply hose 59 is provided at the boss 15 and communicates with the annular groove 58 so that compressed air fed to the connection port 60 can be supplied from the air supply hose 59 to an air motor 80 described later. . The distal end of the drainage channel 57 communicates with an annular groove 61 formed on the support shaft 13.
The boss 15 is provided with a connection plug 62 so as to communicate with the boss 15. A vacuum hose 63 is connected to the base end of the drainage channel 57, and a vacuum hose 64 is joined to the connection plug 62, so that the vacuum hose 64 communicates with a cover 72 described later.

The length of the arm 14 can be adjusted according to the inner diameter of the pipeline 1 by loosening the bolt 73. A cap-shaped cover 7 is attached to the tip of the arm 14.
2 is attached to the bracket 79 via a parallel link composed of link members 74 and 75, and the opening 7 of the cover 72 is
6 can always be opposed to the inner surface of the conduit 1. 7
7 is a weight provided at the other end of the link member 75 so as to obtain a weight balance with the cover 72. 78 is attached to the arm 14 to pull the link member 75 and urge the cover 72 outward. It is a provided coil spring.

Reference numeral 80 denotes an air motor provided outside the cover 72. Reference numeral 81 denotes a rotary joint which rotatably supports a hollow shaft 82 at the center of the cover 72. The rotary joint communicates with the hollow shaft 82. Hose 55 is connected,
A flexible hose 83 connected to the air supply hose 59 is connected to the air motor 80. And the air motor 80
The gear box 84 is provided so that the hollow shaft 82 rotates by the driving of the gear box 84. The tip of the hollow shaft 82 protrudes into the cover 72, and the cover 72 is provided with a nozzle 70 in a forked branch shape as shown in FIG. 8, and the nozzle 70 is configured to rotate within the cover 72. .

Reference numeral 90 denotes a rubber band-shaped sealing member provided on the outer peripheral edge of the opening of the nozzle 70.
0 is provided so as to face the inner surface of the conduit 1 with a small gap therebetween, and external air is introduced from the gap to assist suction of water in the cover 72 and the peeled coating film pieces. . Further, a plurality of free casters 93 are provided on a flange portion 92 on the outer peripheral edge of the cover 72, and the nozzles 70 keep the inner surface of the pipe 1 constant by rolling each of the free casters 93 on the inner face of the pipe 1. It is configured to be able to meet at intervals. Reference numeral 94 denotes a connecting member that maintains the vacuum hose 64 on the cover 72.

On the other hand, bearings 28, 2
9, 43, 44, the hose winding drum 22 is coaxial.
And 23 are rotatably supported respectively. 2
Reference numeral 4 denotes an air motor for rotating the drum 22; 25, an air motor for rotating the drum 23; flexible hoses 26, 27 are wound around the drum 22; And high-pressure water is supplied to the hose 27.

Reference numerals 30 and 31 denote valve stands. A valve 32 provided on the valve stand 30 controls the rotation of the air motor 24, and a valve 33 controls the rotation of the air motor 25, respectively. The valve 34 provided on the valve stand 31 controls the rotation of the air motor 20, and the valve 35 controls the rotation of the air motor 5. The valve 36 regulates the high-pressure water blown from the nozzle 70. A hose connection port 37 protruding from the outside of the bearing 28 is connected to the valves 32, 33, 34, and 35 by piping (not shown) to supply compressed air. Further, a hose connection port 38 protruding outside the bearing 29 is connected to the water supply pipe 53 by a pipe (not shown) to supply high-pressure water.
Reference numerals 41 and 42 denote bearings 28 and 2 for guiding the hoses 26 and 27 unwound from the drums 22 and 23 to the rear of the carriage 2.
9 A guide roller rotatably and horizontally supported by a frame 40 provided at the rear.

In the device configured as described above, the height of the telescopic column 11 is adjusted so that the rotation center of the arm 14 is located on the center line of the pipe 1, and the compressed air provided outside the pipe 1 is adjusted. The tip of the hose 26 is connected to the source, and the tip of the hose 27 is connected to a high-pressure water generator, which is also provided outside the pipe 1. Ultra-high-pressure water pressurized to 2000 kg / cm2 or more is pumped through the hose. I do. Further, the vacuum hose 94 is connected to a vacuum suction device provided outside the pipeline 1. Then, the carriage 2 is caused to travel slowly in the pipeline 1 by driving the air motor 5, and at the same time, the air motor 50 is driven to rotate the arm 14, and the air motor 80 is driven to rotate the nozzle 70. Water is sprayed on the inner surface of the pipe 1. The coating film on the inner surface of the pipeline 1 is peeled off by the ultra-high pressure water sprayed from the nozzle 70. Since the nozzle 70 moves in a spiral trajectory on the inner surface of the pipe 1 by the rotation of the arm 14, the high-pressure water is evenly applied to the nozzle 70, and the distance between the tip of each nozzle and the inner face of the pipe 1 is adjustable.
Since the roller 3 is always kept constant by rolling on the inner surface of the conduit 1, the high-pressure water always hits with a constant strength, and the coating film can be evenly peeled off.

The high-pressure water sprayed from the nozzle 70 is immediately sucked into the vacuum hose 64 in the cover 72 together with the peeled coating film pieces, so that the water and the coating film particles become mist outside the cover 72. There is no scattering. For this reason, there is no possibility that the field of view in the pipeline 1 is obstructed by such a mist, and the work can be performed smoothly.

This bogie has two front wheels and two rear wheels. The front two wheels and the rear two wheels run on an arc-shaped pipe inner surface because their axles are slightly inclined so that the distance between them becomes narrower upward. In this case, a stable running state can be obtained without lateral displacement.

[0018]

As described above, according to the peeling apparatus of the present invention, the traveling film is caused to travel in the pipeline so that the coating film on the inner surface of the pipeline can be uniformly peeled by spraying the ultra-high pressure water. It is possible to work safely without requiring labor as in the past. In addition, there is a beneficial effect such that there is no possibility of damaging the inner surface of the conduit unlike sandblasting. Further, since the injection with the high-pressure water is performed in the cover, the water and the peeled coating film pieces do not scatter in the form of mist. Further, by vacuum suction, mist-like scattering is completely prevented, and water and coating film pieces are collected, so that work in the pipeline can be smoothly performed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a coating film peeling apparatus for an inner surface of a large-diameter pipe according to the present invention.

FIG. 2 is a front view of a coating film peeling apparatus for an inner surface of a large-diameter pipe according to the present invention.

FIG. 3 is a side view of a coating film peeling apparatus for an inner surface of a large-diameter pipe according to the present invention.

FIG. 4 is a plan view of the coating film peeling device for the inner surface of a large-diameter pipe according to the present invention.

FIG. 5 is a longitudinal sectional view of a rotation center portion of an arm of the coating film peeling device for the inner surface of a large-diameter pipe according to the present invention.

FIG. 6 is a sectional view taken along line AA of FIG. 5;

FIG. 7 is a longitudinal sectional view of a cover of the coating film peeling device for the inner surface of a large-diameter pipe according to the present invention.

FIG. 8 is a perspective view of a cover of the coating film peeling device for the inner surface of the large-diameter pipe according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 conduit 2 carriage 3 front two wheels 4 rear two wheels 5 air motor 11 telescopic column 13 support shaft 14 arm 15 boss 50 air motor 51 pinion 52 gear 54 rotary joint 64 vacuum hose 70 nozzle 72 cover 80 air motor 90 seal member 92 flange portion 93 Swivel caster 94 Vacuum hose

Continued on the front page (72) Inventor Shiro Matsumura 1 Higashi-Shinmachi, Higashi-ku, Nagoya City, Aichi Prefecture Inside Chubu Electric Power Co., Inc. Inventor Toshihisa Sato 1 Higashi-Shinmachi, Higashi-ku, Nagoya City, Aichi Prefecture Inside Chubu Electric Power Co., Inc. 3-13-21 Hakata Station East, Hakata-ku, Taihei

Claims (3)

[Claims] 1. A self-propelled vehicle capable of traveling in a large-diameter pipeline, a telescopic column is supported at the front center so as to be adjustable in height, and an upper end portion of the telescopic column is perpendicular to the traveling direction of the traveling vehicle. An arm that rotates in the plane is supported, and a cap-shaped cover is provided at the tip of the arm. A swivel caster provided on the peripheral edge of the cover is rolled to the inner surface of the large-diameter pipe, and Is provided with a nozzle that rotates in a plane perpendicular to the arm,
An apparatus for peeling a coating film on the inner surface of a large-diameter pipe, wherein ultrahigh-pressure water is jetted from the nozzle toward the inner surface of the large-diameter pipe. 2. The apparatus for removing a coating film on the inner surface of a large-diameter pipe according to claim 1, wherein a vacuum hose is disposed on the cover, and the moisture and the peeled coating film pieces in the cover are suctioned by vacuum. 3. The apparatus for removing a coating film on the inner surface of a large-diameter pipeline according to claim 1, wherein the traveling of the self-propelled carriage, the rotation of the arm, and the rotation of the nozzle are each performed by driving an air motor.