JPH0333465B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention cleans and cleans the inner surface of existing pipes or new pipes.
The present invention relates to an apparatus for polishing the inner surface of a tube.

[Conventional technology]

Conventionally, as a method of polishing the inner surface of a pipe, whether it is an existing pipe or a new pipe, a polishing device equipped with a polishing member rotated by an electric motor is inserted into the pipe, and the polishing device is There is a method in which a polishing member is rotated while being pulled at a predetermined speed to clean and polish the inner surface of the tube, and a method in which abrasive sand particles energized by compressed gas are blown into the tube from one end of the tube.
A method is known in which the inner surface of the tube is polished by the impact force of the abrasive sand grains.

[Problem that the invention seeks to solve]

When a device equipped with a polishing member rotated by an electric motor is pulled inside a pipe to polish the inner circumferential surface of the pipe, the polishing member may hit an obstacle installed inside the pipe, such as a water faucet. There is a problem that the rotation comes to a halt due to the resistance caused by contact.

In addition, there is a problem that fine abrasive debris scraped off by the abrasive member enters the motor, shortening the life of the motor, and after the polishing process is finished, the abrasive debris remaining in the pipe is removed using high-pressure water or compressed water. There is an inconvenience that the gas must be discharged outside the tube.

In addition, when using a method that uses abrasive sand grains energized by compressed gas, a sand storage tank and a sand pumping device are required, making the entire device large-scale and also making the polishing cost relatively high. There is a problem.

Therefore, the present invention solves the problems associated with the conventional method described above, and makes the rotary blades, which are rotated according to the force of the wind supplied from one direction inside the pipe, have a function as a polishing plate, and A device for polishing the inner surface of a pipe, in which when the polishing plate comes into contact with an obstacle such as a water faucet, the polishing plate falls down slightly against the force of the wind, allowing smooth and efficient continuous rotational polishing. The purpose is to provide the following.

[Means for solving problems]

To explain in detail the configuration of the present invention to achieve the above object, it is a tube inner surface polishing device for polishing the inner circumferential surface of a tube by pulling the inside of the tube, which comprises an air turbine body fixed to the outer circumference of a main shaft; , a pair of center holders attached to the front and rear of the air turbine body so as to sandwich the air turbine body in order to hold the air turbine body at a substantially central position within the pipe; and one center holder of the pair of center holders. and a traction shaft attached via a bearing to the main shaft, and the air turbine body stands up in response to the force of wind supplied from one direction inside the pipe on the outer periphery of a turbine block fixed to the outer periphery of the main shaft. The pair of center holders may include several half-moon-shaped polishing plates that also serve as rotating blades, and the pair of center holders may include a curved member that can come into contact with the inner peripheral surface of the tube via a bearing. This is a polishing device for the inner surface of a tube, and approximately 3 to 10 half-moon-shaped polishing plates can be arranged around the outer periphery of the turbine block.

According to the device of the present invention, when wind is supplied into the pipe, the polishing plate that also serves as a rotating blade stands up according to the force of the wind,
It comes into contact with the vertical surface formed on the turbine block in an oblique direction and stands upright, and is driven to rotate at high speed (approximately 1000 revolutions per minute) by the force of the wind, and the tip of the polishing plate It makes strong contact with the inner surface of the tube and finishes the base material on the inner surface of the tube.

When the polishing plate collides with an obstacle such as a water faucet protruding into the pipe, the polishing plate resists the force of the wind and falls slightly toward the opposite vertical surface of the turbine block, allowing it to escape from the obstacle. It is capable of continuous rotational movement.

It was found through experiments that the curved surface of the polishing plate does not necessarily have to have an uneven shape, and even if the polishing plate had a normal meniscus shape, there was no significant difference in the polishing effect.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, the specific structure of the apparatus of this invention will be explained in detail based on the illustrated Example.

FIG. 1 is a half-sectional view showing one embodiment of the device of the present invention, FIG. 2 is a front view of a turbine block, FIG. 3 is a plan view of the turbine block shown in FIG. 2, and FIG.
The figure is a front view showing an example of a polishing plate, and numeral 1 in the figure indicates a pipe to be cleaned and polished.

Note that the pipe 1 may be a buried pipe or a non-buried pipe, and it does not matter whether it is an existing pipe or a new pipe.

Reference numeral 2 denotes a main shaft located at the center of the device, and a turbine block 3 is fixed to the outer circumference of the main shaft 2 with a set screw 4, as shown in FIG. As shown in FIGS. 1 to 3, the turbine block 3 has a through hole 5 in its center for tightly inserting the main shaft 2, and has a through hole 5 in its outer periphery for the main shaft 2 to pass through. Several horizontal planes 7 are formed which form planes substantially parallel to 2.

Reference numeral 6 denotes a vertical surface that stands up at the end of the horizontal surface 7 formed on the turbine block 3 so that its extension line intersects diagonally with respect to the main shaft 2. This vertical surface 6
may be carved on the outer periphery of the turbine block 3 so as to diagonally intersect with the main shaft 2, or, although not shown, a horizontal surface 7 may be formed by forming a vertical plate on the turbine block 3 to form a vertical surface. It may be fixed by known means such as welding near the terminal end of the main shaft 2 so as to obliquely intersect with the main shaft 2. The appropriate angle of inclination of the vertical plane 6 with respect to the main axis 2 is 40 to 50 degrees, preferably 45 degrees.
A guide wire member 9 made of a relatively thick wire is installed between the vertical surface 6 and the horizontal surface 7 formed on the outer periphery of the turbine block 3 to hold a polishing plate 8 which also serves as a rotating blade, which will be described later. (1st
Fig. 2).

As shown in FIGS. 1 and 4, the polishing plate 8 is
It has a half-moon shape, and a through hole 11 for loosely fitting the guide wire member 9 is formed at a position slightly above the center of the straight portion 10. In addition, as shown in FIG.
As shown in the figure, a normal half-moon shape may be used without providing a V-shaped groove.

In this way, the polishing plates 8 are disposed on the outer circumference of the turbine block 3, and the number of polishing plates 8 to be disposed is determined by the size of the turbine block 3 depending on the inner diameter of the pipe 1 to be polished. The selection is made as appropriate depending on the size, but usually 3 to 10 sheets are sufficient.

When wind pressure is applied to this polishing plate 8, the polishing plate 8 stands up according to the force of the wind, is held in contact with the vertical surface 6 of the turbine block 3, and rotates together with the main shaft 2 due to the wind. However, when the polishing plate 8 collides with an obstacle in the pipe 1, such as a water distribution faucet (not shown), the polishing plate 8 is guided by the guide line member 9 and rotates into the turbine. Tilt slightly toward the horizontal surface 7 formed on block 3,
This allows continuous operation by avoiding the obstacles, and the air turbine main body is constituted by the turbine block 3, the polishing plate 8, and the guide wire member 9.

Next, reference numerals 13 and 13 in the figure indicate a center holder for holding the air turbine main body at a substantially central position within the pipe 1. A center holder 13 attached near one end includes a holder block 15 attached via a bearing 14 near one end of the main shaft 2, and a holder block 15 attached near one end of the main shaft 2.
A curved member 17 made of piano wire or the like having a predetermined tension directed outward is installed between the main shaft 2 and an auxiliary block 16 attached at a predetermined distance to the outer periphery of the main shaft 2 via a bearing. In addition, the center holder attached near the other end of the main spindle 2 has a holder block 15 attached to the other end of the main spindle 2 via a bearing 14, and is spaced a little from the holder block 15. A curved member 17 similar to that described above is installed between the auxiliary block 16 attached to the traction shaft 18 via a bearing 19, and in this way, the other end of the main shaft 2 is Since the traction shaft 18 is provided through a bearing 19 and is independent of the main shaft 2, the entire device can move smoothly inside the tube 1.

Note that the center holders 13, 13 are not limited to those of the embodiment shown in FIG. 1, as long as they have a structure that allows the air turbine main body to be held substantially at the center within the pipe 1.

In addition, reference numeral 20 in the figure is a through hole drilled in the traction shaft 18, and a connecting metal or the like is appropriately attached to the through hole 20, and the entire apparatus is pulled by a wire winch or the like. Further, 21 indicates a wire brush replaceably attached to the tip of the main shaft 2, and 22 indicates a collar ring fitted to the outer periphery of the main shaft 2 between the turbine block 3 and the holder blocks 15, 15.

Next, to explain the polishing work on the inner surface of a tube using the polishing device of the present invention, first, the entire polishing device placed inside the tube 1 is pulled in the direction of arrow B in FIG. 1 using a wire winch or the like. . On the other hand, from a blower (not shown) installed outside the pipe, air volume: 70 m ³ /
min, wind pressure: 2200 mmAq of air is supplied into pipe 1. Note that arrow A in FIG. 1 indicates the direction of air blowing.

Then, the guide wire member 9 lies on the horizontal surface 7 of the turbine block 3 or on the lower side.
Wind pressure is applied to the polishing plate 8 which is in a hanging state due to the wind resistance, and the polishing plate 8 stands up due to the wind resistance and contacts the vertical surface 6 formed on the turbine block 3, at the same time reducing the wind resistance. It then becomes a type of rotary blade and rotates together with the main shaft 2 at high speed in a predetermined direction.

During this rotation, the curved end of the polishing plate 8 comes into strong contact with the inner surface of the tube 1 to remove and polish various oxides and the like adhering to the inside of the tube 1.

Note that the tip of the polishing plate 8 gradually wears out due to contact with the inner surface of the tube 1, but since the polishing plate 8 has a through hole 11 with a larger diameter than the guide wire member 9, this The polishing plate 8 is pushed outward by centrifugal force according to the amount of wear, and as a result, the polishing plate 8 can be used for a fairly long period of time.

Furthermore, when the polishing plate 8 collides with an obstacle such as a faucet protruding into the pipe 1, the polishing plate 8 is guided by the guide wire member 9 against the force of the wind and is slightly rotated. Since the turbine block 3 is tilted to the side opposite to the vertical plane, it can escape from the obstruction, and the inner surface of the tube 1 can be continuously cleaned and polished. Note that the entire device can also be moved backward by relaxing the traction force of the wire winch.

〔Effect of the invention〕

The apparatus for polishing the inner surface of a pipe according to the present invention has the above-mentioned configuration and operation, and has a polishing function in the rotary blade that is rotated according to the force of the air blown and supplied from one direction inside the pipe. It is possible to downsize the entire device, and since it does not include any rotating mechanism using an electric motor, it is possible to provide a highly reliable polishing device with fewer failures.

Furthermore, since the polishing plate can be turned upside down, the polishing plate has the great advantage of being able to continue the work without interruption even if it bumps into an obstacle within the pipe.

[Brief explanation of the drawing]

FIG. 1 is a half-sectional view showing one embodiment of the device of the present invention, FIG. 2 is a front view of a turbine block, FIG. 3 is a plan view of the turbine block shown in FIG. 2, and FIG.
The figure is a front view showing an example of a polishing plate. 1: Pipe, 2: Main shaft, 3: Turbine block,
4: Set screw, 5: Through hole, 6: Vertical surface, 7: Horizontal surface, 8: Polishing plate, 9: Guide linear member, 10: Straight section, 11: Through hole, 12: V-shaped groove, 13: Center Holder, 14: Bearing, 15: Holder block, 16: Auxiliary block, 17: Curved member, 18: Traction shaft, 19: Bearing.

Claims (1)

[Claims] 1. A tube inner surface polishing device that polishes the inner circumferential surface of a tube by pulling the inside of the tube, which includes an air turbine body fixed to the outer circumference of a main shaft, and a device for holding the air turbine body at a substantially central position within the tube. The air turbine comprises a pair of center holders attached to the front and rear of the air turbine body so as to sandwich the air turbine body, and a traction shaft attached to one of the pair of center holders via a bearing. The main body has several polishing plates on the outer periphery of a turbine block fixed to the outer periphery of the main shaft, which are half-moon shaped and serve as rotating blades, which rise in response to the force of the wind supplied from one direction inside the pipe. The apparatus for polishing the inner surface of a tube is characterized in that the pair of center holders are provided with curved members via bearings that can come into contact with the inner circumferential surface of the tube.