JP2716938B2 - Pipe inner surface polishing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polishing apparatus for polishing the inside of a pipe, and more particularly to a polishing apparatus for polishing the inside of a pipe which can prevent rotation of a chassis due to a reaction of polishing.

[0002]

2. Description of the Related Art For example, a medium or small-diameter pipe body having a diameter of 20 inches or less, such as an outlet of a safety valve in a power plant, is difficult to polish the inner surface even if rust enters. Is used to polish the inner surface to remove rust, scale, and other foreign matter. A conventional pipe inner surface polishing apparatus includes a chassis that self-runs in the pipe or is pulled by a wire rope or the like drawn out of the pipe, a rotor rotatably supported by the chassis, and a rotor supported by the rotor. And a motor mounted on a chassis for rotationally driving the rotor and the polishing tool.

In this conventional pipe inner surface polishing apparatus, a rotor and a polishing tool are rotated by a motor while being inserted into the pipe and moving in the axial direction of the pipe by self-propelling or towing, and the polishing tool is placed inside the pipe. The inner surface of the tubular body is polished by sliding contact.

[0004]

For this reason, a reaction force which the polishing tool receives from the inner surface of the tube acts on the chassis, and the chassis rotates in a direction opposite to the rotation direction of the motor, the rotor and the polishing tool. As well as twisting the cord that supplies power to the motor from outside the tube, the hydraulic hose that supplies pressurized oil, or the air hose that supplies compressed air,
There is a problem that its durability is reduced.

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a tube inner surface polishing apparatus capable of preventing rotation of a chassis due to a reaction of polishing.

[0006]

The present invention comprises a chassis,
In the tube inner surface polishing apparatus, which is rotatably supported by the chassis and supports a polishing tool that slides on the inner surface of the tube, and a motor that is supported by the chassis and drives the rotor and the polishing device to rotate. The following measures are taken to achieve the purpose.

That is, first and second rotors, which are arranged one above the other in a coaxial manner and respectively support polishing tools,
A center shaft that is coaxially and rotatably inserted through the first rotor and is fixed to the second rotor, a motor that drives the center shaft, and a first rotor that rotates around the center shaft. And a reversing mechanism that interlocks with each other.

[0008]

In the present invention, when the motor of the pipe surface polishing apparatus inserted into the pipe is operated, the rotation of the motor is transmitted to the second rotor via the central axis so as to rotate in the same direction as the central axis. At the same time, the rotation of the motor is transmitted from the central axis to the first rotor via the reverse rotation mechanism to the first rotor so as to rotate in a direction opposite to the central axis.

Therefore, the direction of the reaction force received by the first rotor from the inner surface of the pipe when the polishing tool supported by the first rotor slides on the inner surface of the pipe, and the polishing tool supported by the second rotor, 2nd slide from the inner surface of the tube
The direction of the reaction force applied to the rotor is opposite to the direction of the reaction force, and since these reaction forces have equal strengths and cancel each other out, the chassis is apparently rotated by the reaction of polishing. The force does not act and the rotation of the chassis is prevented.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a polishing apparatus for polishing the inner surface of a pipe according to an embodiment of the present invention.
As shown in the perspective view of FIG. 1 and the partially cutaway front view of FIG. 2, the pipe inner surface polishing apparatuses according to one embodiment of the present invention are arranged vertically one above the other in a coaxial shape, and each has a wire brush and a roller. First and second rotors 1.2 for supporting the tool,
A center shaft 3 coaxially and rotatably inserted through the first rotor 1 and fixed to the second rotor 2; an electric motor 4 driving the center shaft 3; 3
And a reversing mechanism 5 for interlocking the first rotor 1 such that they rotate in reverse with each other.

As shown in FIG. 2, the motor 4 is constituted by a motor with a speed reducer. The output shaft 7 is mounted on the upper side of the chassis 6 with the output shaft 7 facing downward. The rotation of the motor 4 is transmitted to the second rotor 2 in the same direction by being connected to the center shaft 3 by a coupling 8. The center shaft 3 is coaxially inserted into a hollow shaft 9 rotatably supported by a chassis 6, and the first rotor 1 is fixed to the hollow shaft 9 below the chassis 6.

The reverse rotation mechanism 5 only needs to be configured to transmit the rotation of the central shaft 3 to the first rotor 1 so as to rotate the first rotor 1 in a direction opposite to the rotational direction of the central shaft 3. For example, FIG. 1 is a perspective view, FIG. 2 is a partially cutaway front view, and FIG. 3 is a plan view and FIG. 4 is a plan view of FIG. The reversing mechanism 5 is disposed in a space inside the chassis 6, and is disposed at a symmetrical position with respect to the first gear 10 fixed to the center shaft 3 via the coupling 8 and the first gear 10 as a center. 6, a pair of first support shafts 11 rotatably supported by the first support shaft 6, a pair of second gears 12 fixed to the upper half of each first support shaft 11, and meshing with the first gear 10, A pair of second support shafts 13 symmetrically arranged with respect to one gear 10 and rotatably supported by the chassis 6, and a second gear 12 fixed to the upper half of each second support shaft 13 A pair of third gears 14 meshing with the second shaft 13; a pair of fourth gears 15 coaxial with the third gears 14 fixed to the upper half of each second support shaft 13; And a fifth gear 16 meshed with the fourth gears 15.

Each pair of the first support shaft 11, the second gear 12, the second
One set of the support shaft 13, the third gear 14, and the fourth gear 15 may be omitted or three or more sets may be provided. In this embodiment, the transmission of the rotational force is smoothly performed.
In order to achieve a good balance, two sets of these are provided, and they are symmetric with respect to the center axis 3.

The chassis 6 includes a rectangular upper plate 17 and a lower plate 18 each of which has four cutout corners, and six upper and lower plates 18 and 18 connected to each other at the front, rear, and middle portions of the left and right sides. And a side plate 20 connecting the short sides of the upper plate 17 and the lower plate 18 to each other. Further, as shown in FIGS. 1 and 2, a plurality of polishing tools each including a wire brush 31 and 32 are fixed to the first and second rotors 1 and 2 at equal intervals in the circumferential direction. At the same time, three to four rotating guide rollers 33 rotating and rotating around a vertical axis (an axis parallel to the axis of the tube) on the inner surface of the tube to be polished are equally spaced in the circumferential direction. Fixed. The chassis 6 is provided with three to four advance / retreat guide rollers 34 which are in contact with the inner surface of the pipe to be polished while rotating about a horizontal axis (an axis perpendicular to the axis of the pipe) and rolling. Fixed at equal intervals.

A bifurcated lifting bracket is connected to the lower portion of the chassis 6 of the pipe inner surface polishing apparatus in which the polishing tool, the rotation guide roller 33 and the reciprocating guide roller 34 are assembled, and the lifting tool such as a hoist or a crane is used. The pipe inner surface polishing apparatus is lifted through the pipe and suspended in the pipe, and the first and second
When both rotors 1 and 2 are in the tube, the motor 4 is started to start polishing.

The rotation of the motor 4 (for example, clockwise rotation) causes the second rotor 2 to rotate in the same direction as the motor 4 (for example, clockwise) via the coupling 8 and the center shaft 3. To be transmitted. The first gear 10 of the reversing mechanism 5 is in the same direction as the center shaft 3 (for example, clockwise).
The second gear 12 is in the opposite direction (for example, counterclockwise), the third gear 14 and the fourth gear 15 are in the same direction (for example, clockwise) with the central shaft 3, and the fifth gear 16 is in the opposite direction. Rotate in the respective directions (eg, counterclockwise).

Accordingly, the first rotor 1 fixed to the fifth gear 16 via the hollow shaft 9 rotates in a direction opposite to the center shaft 3 (for example, counterclockwise) and rotates in a direction opposite to the second rotor 2. Will do. When each of the polishing tools attached to the first and second rotors 1 and 2 comes into sliding contact with the inner surface of the tubular body, a reaction force is generated due to friction of the respective polishing tools against rotation, and the reaction force causes the second rotor 2 to rotate. , A force acting in the direction opposite to the direction of rotation of the central shaft 3 acts on the first rotor 1, while a force acting in the same direction as the center shaft 3 acts on the first rotor 1.

The reaction force acting on the first rotor 1 is
And acts on the central shaft 3 via the reversing mechanism 5 so as to rotate the central shaft 3 in the same direction as its rotation direction, thereby canceling the reaction force acting from the second rotor 2. The reaction force acting on the first and second rotors 1 and 2 is determined by the contact pressure of the polishing tool and the coefficient of friction of the polishing tool against the inner surface of the tube. Contact the inner surface of the
The reaction force acting on the second rotors 1 and 2 has the same strength in opposite directions, and apparently the chassis 6 has the first and second rotors.
The reaction force of both rotors 1 and 2 does not work.

As a result, there is no danger that the chassis 6 will rotate, and the pipe inner surface polishing apparatus can move in the axial direction without rotating around the axis of the pipe, thereby supplying power to the motor 4. Is prevented from being twisted, thereby improving the durability of the cord. In the above-described embodiment, the pipe inner surface polishing apparatus is moved up and down by raising and lowering the pipe inner surface polishing apparatus with a lifting machine. There is no hindrance to a configuration in which the robot can move by itself in the axial direction.

The reverse rotation mechanism 5 is disposed between the motor 4 and the first rotor 1, but the first and second rotors 1.2
It is also possible to arrange the reversing mechanism 5 between the two. In this case, the motor 4 is constituted by a biaxial motor, and the motor 4 is arranged between the first rotor 1 or the second rotor 2 and the reversing mechanism 5. You can also. Further, in the above embodiment, the motor 4
Is constituted by an electric motor, but the motor 4 may be constituted by a hydraulic motor or an air motor.

[0021]

As described above, according to the present invention, the first and second rotors arranged coaxially and vertically and supporting the polishing tool, respectively,
A center shaft rotatably inserted therein and fixed to the second rotor; a motor driving the center shaft; and a reversing mechanism for interlocking the first rotor with the center shaft such that the first rotors are rotated in opposite directions. Therefore, the polishing tools supported by the first and second rotors, which are opposite to each other, rotate while contacting the inner surface of the tube, so that the polishing tools receive the opposite reaction force in the same direction from the inner surface of the tube. As a result, these reaction forces cancel each other, so that the reaction force apparently disappears and the chassis does not rotate.

Accordingly, there is no danger of twisting of the cord for supplying electric power to the motor, the hydraulic hose for supplying pressure oil to the motor, and the air hose for supplying compressed air to the motor. Also, there is no danger that the hydraulic hose or air hose will be unscrewed or threaded.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the principle of the present invention.

FIG. 2 is a partially cutaway front view of one embodiment of the present invention.

FIG. 3 is a plan view of one embodiment of the present invention.

FIG. 4 is a plan view showing the configuration of a reversing device according to one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... 1st rotor 2 ... 2nd rotor 3 ... Center axis 4 ... Motor 5 ... Reverse rotation mechanism 6 ... Chassis

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mitsuyasu Matsuo 2-181-1, Shinmachi, Nishi-ku, Osaka-shi Inside Shinei Shoten Co., Ltd. No. Sanyo Giken Co., Ltd. (56) References JP-A-63-28548 (JP, A) JP-A-4-32560 (JP, A)

Claims (1)

(57) [Claims] 1. A first and second rotors 1, 2 which are arranged vertically one above the other and coaxially support a polishing tool, and are inserted coaxially and rotatably through the first rotor 1. A central shaft 3 fixed to the second rotor 2, an electric motor 4 for driving the central shaft 3, and the first rotor 1 and the second rotor 2 are rotated around the central shaft 3 in a direction opposite to each other. The motor 4 is mounted on the upper side of the chassis 6 with the output shaft 7 facing downward, and is coupled to the output shaft 7 protruding into the chassis 6. 8, the rotation of the motor 4 is transmitted to the second rotor 2 in the same direction, and the center shaft 3 is coaxially inserted into the hollow shaft 9 rotatably supported by the chassis 6. The hollow shaft 9 below the chassis 6
The first rotor 1 is fixed to the
A gear mechanism is configured to transmit the rotation of the center shaft 3 to the first rotor 1 so as to rotate the first rotor 1 in the direction opposite to the rotation direction of the first rotor 1, and the reverse rotation mechanism 5 is arranged in a space in the chassis 6. , A first gear 10 fixed to the center shaft 3,
A pair of second gears 12 arranged symmetrically with respect to the gear 10 and meshing with the first gear 10;
A pair of third gears 14 arranged symmetrically with respect to the center gear 0 and meshing with the second gear 12, a pair of fourth gears 15 coaxially connected to the respective third gears 14, 4 gear 1
And a fifth gear 16 connected to the first rotor 1 and fixed to the first and second rotors with a plurality of polishing tools made of wire brushes 31 and 32 at equal intervals in the circumferential direction. At the same time, three or four rotating guide rollers 33, which rotate and rotate around the vertical axis on the inner surface of the pipe to be polished, are fixed at equal intervals in the circumferential direction, and the pipe to be polished to the chassis 6 is fixed. That three to four guide rollers 34 that roll and rotate around the horizontal axis on the inner surface of the body are fixed at equal intervals in the circumferential direction, and that a bifurcated lifting bracket is provided at the lower portion of the chassis 6. Characteristic tube interior surface polishing device.