JPH08121434A - Multistage extension mechanism and working device provided with multistage expansion mechanism - Google Patents

Abstract

PURPOSE: To simplify the structure, reduce the weight and miniaturize the device by obviating the hose for supplying fluid. CONSTITUTION: A casing 2 is provided on a base 1, a pressurizing chamber 4 is formed in the casing 2 by connecting a fluid supplying pipe 3 to the casing 2. An outside cylindrical body 11 communicated with the pressurizing chamber 4 is connected to the lower surface of the base 1. A first inner cylindrical body 14, a second inner cylindrical body 15 and a third inner cylindrical body 16 are coaxially inserted into an outer cylindrical body 11. Seal materials 11 are fitted into the lower end thick part 11b of the outer cylindrical body 11 and thick parts 14a, 14b, 15a, 15b, 16a of first to third inner cylindrical bodies 14 to 16. A hook 17 for hooking a wire 10 on its upper end is connected to the third inner cylindrical body 16, and a working jig 18 is connected to the lower end. When respective inner cylindrical bodies 14 to 16 are extended, the wire 10 is delivered while pressurizing the pressurizing chamber 4, when respective cylindrical bodies 14 to 16 are contracted, the wire 10 is rewound on a drum 6 by driving a drum driving source 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multistage telescopic mechanism and multistage telescopic mechanism suitable for cleaning, inspecting, inspecting and repairing equipment in a reactor pressure vessel such as a light water cooling type reactor or in a working pool. The present invention relates to a working device including a mechanism.

[0002]

2. Description of the Related Art Conventionally, when a cleaning nozzle or a work tool is moved up and down in a reactor pressure vessel or a work pool for positioning, an auxiliary hoist installed in a refueling machine or a main winding or auxiliary crane of an overhead crane is used. A method of hanging and moving and positioning the wire rope by a wire rope winder such as a winding machine, a method of attaching and hanging the wire rope to the tip of a rod jig such as a pole, and a multistage combination such as a fuel-exchanger mast. There is a method of attaching it to the tip of the telescopic mechanism and hanging it.

In particular, in order to accurately determine the position of the cleaning nozzle and the work tool and to rigidly support them, a rod-shaped jig such as a pole or a multistage expansion / contraction mechanism is used for movement / positioning. Further, in order to automate the work and improve the efficiency, a multistage expansion / contraction mechanism such as a fuel exchange mast is suitable, and conventionally, expansion / contraction mechanisms of various shapes have been used.

[0004]

When the cleaning nozzle is moved and positioned by using the conventional multi-stage expansion / contraction mechanism having the above-mentioned structure, it is necessary to supply a fluid such as water or air to the tip, so that the nozzle is supported. A hose is required in addition to the expansion and contraction mechanism. Further, since the work tool is extended by its own weight during movement and positioning, when a pressing force larger than its own weight is required, a complicated mechanism such as a specially provided guide, drive source, and transmission mechanism is required.

When a cleaning nozzle or a work tool is moved to various positions in the furnace for positioning, a jet pump or the like exists, for example, between the shroud and the reactor pressure vessel (annulus portion), so that the inside is complicated and narrow. Workability is very poor at locations where it is difficult to approach from the top, and it is impossible to work inside the jet pump.

[0006] In particular, when the expansion / contraction mechanism is made to crawl the hose, interference between the hose and the surrounding structure poses a problem, and it is necessary to prevent the hose from being caught. In addition, since the cross-sectional size of the passage when the cleaning nozzle and the work tool are hung down from the top is limited, it is necessary to reduce the size of the expansion and contraction mechanism itself. Furthermore, in order to improve the handleability when moving and positioning the entire expansion / contraction mechanism, it is desired that the weight and size be as small as possible.

The present invention has been made to solve the above problems, and performs work such as cleaning, inspection, inspection and repair of equipment in a reactor pressure vessel such as a light water cooling type reactor or in a working pool. At this time, as a multi-stage expansion and contraction mechanism for moving and positioning cleaning nozzles and work tools to each part, there is no need for a hose that supplies fluid such as water to the tip, and it is possible to generate a pressing force larger than its own weight. It is an object of the present invention to provide a multi-stage telescopic mechanism and a working apparatus including the multi-stage telescopic mechanism, which has a small cross-sectional dimension of an ascending / descending (extending / contracting) portion for passing a limited cross-sectional dimension, has a simple structure, is lightweight, and is downsized.

[0008]

According to the present invention, there is provided a base, a fluid pressure chamber provided on the base, and an outer cylindrical body connected to the lower surface of the base and communicating with the pressure chamber. A plurality of inner cylindrical bodies that are successively reduced in diameter and coaxially and expandably and contractably inserted into the outer cylindrical body; a wire provided on at least one inner cylindrical body of the plurality of inner cylindrical bodies; and the outer cylindrical body And a plurality of inner cylinders, and a sealing material provided at a portion in sliding contact at both upper and lower ends.

Further, according to the present invention, a base, a fluid pressure chamber provided on the base, an outer cylinder connected to the lower surface of the base and communicating with the pressure chamber, and A plurality of inner cylinders which are successively reduced in diameter and are inserted coaxially and expandably, a wire provided on at least one inner cylinder of the plurality of inner cylinders, the outer cylinder and a plurality of inner cylinders. It is characterized in that it comprises a seal member provided at a site where the body slides in contact with each other at the upper and lower ends, and a working jig provided at a terminal end of the smallest diameter inner cylinder among the plurality of inner cylinders. And

[0010]

[Function] In a multi-stage expansion / contraction mechanism for vertically moving and positioning a cleaning nozzle, a working device, etc. in a reactor pressure vessel, a working pool, etc., a plurality of cylindrical bodies are coaxial,
They are combined in multiple stages and each connecting part is sealed and arranged so that they can slide and expand. Then, an expansion / contraction wire is passed through the cylindrical body, and a winding pulley, a drum, and a drum rotation drive unit are provided on the upper portion of the cylindrical body.

When fluid pressure is applied to the inside of a multi-stage, coaxially combined cylinder, the connecting portions of each stage are sealed, so that the horizontal cross section of each cylinder is used as a pressure receiving surface to receive the extension force by the fluid pressure and extend. . Further, the wire can be wound up to be contracted.

When it is necessary to supply a fluid such as water or air to a cleaning nozzle, the inside of the cylindrical body serves as a fluid supply passage, so that a supply hose up to the tip of the expansion / contraction mechanism becomes unnecessary. Therefore, there is no need to feed or wind the hose, and the system and structure are simplified.

Further, the fluid pressure acting on the horizontal cross section of the cylindrical body can generate a pressing force larger than its own weight,
No special mechanical extension mechanism is required. From the above, it is possible to reduce the cross-sectional dimension of the ascending / descending (expanding / contracting) portion, simplify the structure of the expanding / contracting mechanism, and reduce the weight and size.

Further, the winding pulley and drum are
It is placed in the same pressure chamber as the inner surface of the cylinder where fluid pressure acts,
The rotary sliding part of the rotary shaft for driving the drum is sealed and taken out of the pressure chamber.

Since the winding pulley and the drum for winding the contracting wire are in the pressure chamber, it is not necessary to seal the linear sliding portion of the wire, and only the rotary sliding portion is sealed as is usually done. As a result, the reliability of the seal of the pressure chamber can be improved when the contraction wire is passed through the cylindrical body under pressure.

Further, the contraction wire is connected to the cylindrical body from the tip of the cylindrical body without passing through the cylindrical body. The extension is performed by fluid pressure, and the contraction is also performed by winding the wire. Since the wire is not passed through the cylindrical body, it is possible to extend and retract even a thin cylindrical body in which the hoisting wire cannot be passed, and the number of wires can be increased to increase the hoisting force.

Further, at the sliding connection portion of each cylindrical body, a foreign matter scraping portion is provided for scraping off foreign matter adhering to the outer surface of the cylindrical body at the time of contraction to ensure cleanliness.
As a result, even if the outer surface of the cylindrical body contracts with dust or foreign matter attached thereto, it is possible to prevent dust or foreign matter from being caught in the seal portion of each stage.

Therefore, it is possible to prevent the sliding portion from being galled or fixed and being unable to expand or contract. Further, the sealing property of each stage can be kept sound. Also, it is possible that dust and foreign matter are activated when used in the furnace, but when contracting, dust and foreign matter are attracted to the foreign matter scraping part, so cleaning only this part It can prevent high levels of pollution throughout the body.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a multistage expansion / contraction mechanism and a working apparatus equipped with the mechanism according to the present invention will be described with reference to FIGS. 1 (a) and 1 (b). Note that FIG. 1B is the same as FIG.
FIG.

In FIGS. 1 (a) and 1 (b), reference numeral 1 is a base, a casing 2 is installed on the base 1, and a fluid supply pipe 3 is connected to the casing 2. A fluid is supplied to the inside of the casing 2 from a fluid supply pipe 3, and the inside of the casing 2 on the base 1 becomes a pressurizing chamber 4. A pulley 5 and a drum 6 are provided on the base 1 in the casing 2.
Is installed, and the drum 6 is connected to a drum drive source 7 installed on the base outside the casing 2.

That is, a drum drive shaft 8 is connected to the drum 6, and the shaft 8 is kept airtight by a drive shaft seal 9 and is connected to the drum drive source 7. The wire 10 is wound around the drum 6, and the wire 10 comes into contact with the pulley 5 and is sent out, and the winding is guided.

An elongated outer cylindrical body 11 is connected to the lower surface of the base 1 so as to hang down, and an upper end opening 11a of the outer cylindrical body 11 communicates with a ventilation hole 12 provided in the base 1. A thick-walled portion 11b protruding toward the inner and outer surfaces is formed in the vicinity of the lower end opening of the outer cylindrical body 11, and a sealing material 13 is fitted on the inner surface of the thick-walled portion 11b. A first inner cylinder 14 is inserted in the outer cylinder 11.

The first inner cylindrical body 14 has a thick-walled portion 14a projecting outward at the upper end opening and a thick-walled portion 14b projecting at the inner and outer surfaces at the lower end opening. These thick parts 14a,
A sealing material 13 is fitted into each of the 14b.

A second inner cylinder 15 is inserted in the first inner cylinder 14. The second inner cylindrical body 15 has a thick portion 15a projecting outward at the upper end opening and a thick portion 15b projecting at the inner and outer surfaces at the lower opening. A sealing material 13 is fitted in each of the thick portions 15a and 15b.

A third inner cylinder 16 is inserted into the second inner cylinder 15. The third inner cylindrical body 16 has a thick portion 16a protruding outward at the upper end opening and a thick portion 16b protruding outward on the lower end opening.

A seal member 13 is fitted into the thick portion 16a at the upper end, and a hook 17 for hooking the wire 10 is connected thereto. A connecting member 19 for attaching the working jig 18 is connected to the thick portion 16b at the lower end.

Each thick portion 11b, 14a, 14b, 15a, 15b,
Reference numerals 16a and 16b serve as sliding parts when the cylindrical bodies 11, 14, 15 and 16 move up and down to expand and contract. Since each sliding portion is sealed by the sealing material 13, the alignment of each step during expansion and contraction is performed.

Next, the operation of the multistage telescopic mechanism and the working apparatus equipped with the multistage telescopic mechanism according to the first embodiment will be described. In FIG. 1, a plurality of cylindrical bodies 11 and 14 to 16 are coaxially and multi-staged to be slidable and expandable by sliding at each thick portion, and each sliding inner and outer surface is sealed by a sealing material 13, At the time of expansion and contraction, the alignment of each step is performed and the pressure inside and outside each cylinder is sealed. In this embodiment, the case of four stages is shown.

The outer cylindrical body 11 on the base side is fixed to the base 1, and the third inner cylindrical body 16 has a cleaning nozzle as a working jig 18 attached to the tip thereof. The contraction wire 10 is connected by a hook 17 for wire connection.

As the work jig 18, it is possible to attach a work tool for inspection, inspection and repair in addition to the cleaning nozzle. The shrinking wire 10 is wound around the drum 6 via the pulley 5.

The pulley 5 and the drum 6 are fixed to the base 1 in the casing 2, and only the drum drive shaft 8 for rotating the drum 6 is sealed in the casing 2 by the drive shaft seal 9 and taken out to the outside. . The drum drive shaft 8 is connected to the drum drive source 7.

Therefore, in FIG. 2, a fluid such as water or air is supplied from the fluid supply pipe 3 and the outer cylinder 11 and the first to the third cylinders.
When pressure is applied to the inside cylindrical bodies 14 to 16 and the casing 2, the extension force acts by the fluid pressure with the end surface of each cylindrical body as a pressure receiving surface, so that the drum 6 is rotated and the contraction wire 10 is rotated.
When is rewound, the first to third inner cylindrical bodies 14 to 16 expand due to this fluid force and their own weight.

Which connecting portion of each cylindrical body is to be extended is determined by the point where the acting force obtained by adding the self-weight to the pressure receiving area of the end face and the extension force applied with the fluid pressure exceeds the maximum static friction force of each seal member 13. Will be extended from.

A fluid such as water or air supplied from the fluid supply pipe 3 passes through each of the cylindrical bodies 11 and 14 to 16 and is supplied to the cleaning nozzle at the tip. Therefore, the supply hose can be deleted.

As a result, it is not necessary to feed or wind the hose, and the system and structure are simplified. In addition, the hydraulic pressure acting on the horizontal cross section of each cylinder can generate a pressing force larger than its own weight, eliminating the need for a special drive mechanism for pressing such as guides, drive sources, and transmission mechanisms, simplifying the structure. To be done.

FIG. 2 shows, as an example, a case of extending downward from the root. At the time of contraction, the drum 6 is rotated to wind up the contraction wire 10 so that each cylindrical body 14-16
Can be contracted.

The connection from which each cylindrical body 10 contracts depends on the fact that the action force obtained by subtracting the fluid extension force and the self-weight from the winding force exceeds the maximum static friction force of each sealing material 13. become.

Although the position of the shrinking wire 10 changes when it is wound on the drum 6, the shrinking wire 10 moves through the pulley 5.
Since 10 is wound up on the drum 6, the pulling force at the time of contraction always acts on the axial center of each cylindrical body 11, 14-16. Therefore, when contracting, the pulling force acts diagonally and each cylindrical body
14-16 will be slanted and will not bite.

Further, the drum drive shaft 8 is taken out of the casing 2 to which pressure is applied with its rotary sliding portion sealed. Therefore, since the contraction wire 10 is in the pressure chamber and it is not necessary to seal the linear sliding portion of the wire, when the contraction wire 10 is passed through each of the cylinders under pressure, The seal reliability can be improved.

According to the multi-stage expansion / contraction mechanism configured as described above, when a fluid such as water or air is required to be supplied to the cleaning nozzle, each cylinder serves as a fluid supply path, so that the common hose up to the tip of the expansion / contraction mechanism is used. Becomes unnecessary.

Therefore, it is not necessary to feed or wind the hose, and the system and structure are simplified. Further, a pressing force larger than its own weight can be generated by the fluid pressure acting on the horizontal cross section of each cylindrical body, and a special drive mechanism for pressing is unnecessary. From the above, it is possible to reduce the sectional size of the ascending / descending (extending / contracting) portion, simplify the structure of the expanding / contracting mechanism, and reduce the weight and size.

Next, a second embodiment of the multistage expansion / contraction mechanism according to the present invention will be described with reference to FIG. In FIG. 3, a winding member 20 is arranged at the tip of the third inner cylindrical body 16, and at least two contraction wires 10 are attached to the outer cylindrical body 11 and the inner cylindrical body.
They are connected along the outside of the outer cylindrical body 11 without passing through the inside of 14 to 16.

The shrinking wire 10 is made of the same material as in the first embodiment.
It is wound around two drums 6 via one pulley 5 and is wound up and down by a drum drive source 7. Further, the pulley 5 and the drum 6 are arranged outside the pressure chamber to which the fluid pressure is applied. The other parts are similar to those of the first embodiment, and the description thereof is omitted. Expansion and contraction in this embodiment are performed in the same manner as in the first embodiment.

In this embodiment, the outer cylindrical body 11 and the inner cylindrical body
Since the wire is not passed through the inside of 14 to 16, even a thin cylindrical body in which the winding wire 10 cannot be passed can be extended and contracted. Further, since the number of wires can be increased, the winding force can be increased, and the winding can be performed when the fluid pressure is large and the extension force does not occur.

Next, a third embodiment of the multistage expansion / contraction mechanism according to the present invention will be described with reference to FIG. FIG. 4A is an enlarged partial cross-sectional view of each connecting portion of the outer cylindrical body 11 and the first and second inner cylindrical bodies 14 and 15 arranged coaxially and in multiple stages. FIG.
In (a), in addition to the sealing material 13 of each step, a sliding sealing material 21
To provide. The lip-shaped sliding seal material 21 scrapes off foreign matter adhering to the outer surfaces of the cylindrical bodies 14 and 15 during contraction,
The cleanliness can be secured.

As a result, even if the outer surfaces of the inner cylindrical bodies 14 and 15 contract with dust or foreign matter attached, the sliding seal material 13 at each step
Prevent dust and foreign matter from getting into the seal part of the
In other words, it is possible to prevent galling or sticking of the sliding portion, which makes it impossible to expand or contract. Furthermore, the sealing property of each cylinder can be kept sound.

Further, it is considered that dust and foreign matters are activated when used in the furnace. However, since dust and foreign matters are attracted to the sliding seal member 21 during contraction, only this portion is washed. By doing so, it is possible to prevent high level contamination of the entire outer surface of the inner cylindrical bodies 14 and 15.

Next, an example in which the light water-cooled reactor is applied to the working apparatus having the multistage expansion / contraction mechanism according to the present invention will be described with reference to FIGS. 5 and 6. FIG. 5 shows a state in which the working device equipped with the multistage expansion / contraction mechanism shown in FIG. 1 is installed in a reactor pressure vessel. A shroud 25 surrounding a reactor core (not shown) is installed in the reactor pressure vessel 22, and an annulus portion 26 is formed between the shroud 25 and the reactor pressure vessel 22. An operation floor 27 is provided above the reactor pressure vessel 22.

In the working device main body 29, the support base 30 is fixed to the flange 23 of the reactor pressure vessel 22 using the stat bolt 24. A turning rail 31 is fixed on the support base 30, and a turning table 32 is rotatably arranged on the turning rail 31.

On the turning table 32, three hoisting machines 33 for raising and lowering are installed, the raising and lowering beam 34 can be moved up and down by the wire 28, and the fixed pressure pad 22 makes the reactor pressure vessel 22
It is fixed to the inner wall.

A control unit 38 is installed on the operation floor 27, and the control unit 38 has a support base 30.
Cable 39 or other hose to connect to the above equipment,
Fiber etc. are connected.

A plurality of radially movable masts 35 are installed on the elevating beam 34, and a working tool 37 such as a cleaning nozzle provided at the tip can be moved vertically. The present invention is a multistage expansion / contraction mechanism corresponding to the mast 35.

The work tool 37 is moved to each part in the furnace by the degree of freedom of turning of the turning table 32 of the working device body 29, the degree of freedom of lifting of the lifting beam 34 and the mast 35, and the degree of freedom of movement of the mast 35 in the radial direction. Installed and positioned.

FIG. 6 is a conceptual diagram showing another example of use when the work tool 37 is installed on the annulus portion 26 by the in-furnace work device. Lifting beam with mast 35 retracted
34 Move the upper part in the radial direction to move it to a position where it can descend to the annulus portion 26.

Next, the elevating beam 34 and the mast 35 are lowered together, and the elevating beam 34 is fixed to the upper part of the shroud 25 by a fixed pad.
It is fixed by 36. Then, the mast 35 is expanded and contracted to move, install, and position the work tool 37 in the vertical direction to perform work.

The annulus portion 26 has a jet pump or the like inside and is complicated, and it is difficult to approach from the top due to its narrow space. Therefore, the cross-sectional size of the passage is limited. There is no tension, the cross-sectional size is small, the amount of extension is large, and the rigidity during extension must be high.

Further, it is desirable that the work device described with reference to FIGS. 1, 3 and 4 is capable of satisfying the above demands, though it is desirable that the work device described in FIGS. it can.

[0058]

According to the present invention, a plurality of cylindrical bodies are coaxially arranged,
It is arranged in such a way that it can be expanded and contracted by sliding in such a manner that each connecting part is sealed as a sliding part by combining in multiple stages. And
A retracting wire is passed through the cylindrical body, and a winding pulley, a drum, and a drum rotation drive unit are provided above the plurality of cylindrical bodies.

According to the multistage expansion / contraction mechanism configured as described above, when a fluid such as water or air needs to be supplied to the cleaning nozzle, the inside of the cylindrical body serves as a fluid supply passage, so that the supply hose up to the tip of the expansion / contraction mechanism is provided. It becomes unnecessary.

Therefore, it is not necessary to feed or wind the hose, and the system and structure are simplified. Further, a pressing force larger than its own weight can be generated by the fluid pressure acting on the horizontal cross section of each cylinder, and a special drive mechanism for pressing is unnecessary. Elevation (expansion and contraction) from the above
It is possible to reduce the cross-sectional size of the part, simplify the structure of the expansion mechanism, and reduce the weight and size.

Further, the winding pulley and the drum are arranged in the same pressure chamber as the inner surface of the cylindrical body on which the fluid pressure acts, and the rotary sliding portion of the drum driving rotary shaft is sealed and taken out of the pressure chamber. .

As a result, it is not necessary to seal the linear sliding portion of the wire, and it suffices to seal the rotary sliding portion as is usually done. Therefore, the sealing reliability of the pressure chamber can be improved when the contraction wire is passed through the cylindrical body under pressure.

Further, by connecting the shrinking wire to the outer cylindrical end portion without passing through the cylindrical body, it is possible to extend and retract even a thin cylindrical body which cannot pass through the winding wire, and increase the number of wires. The winding force can be increased.

Further, at the sliding connection portion of each cylindrical body, a sliding seal member for scraping foreign matter is provided to scrape off the foreign matter adhering to the outer surface of the cylindrical body at the time of contraction to ensure cleanliness. Even if the outer surface of the body contracts with dust or foreign matter, it prevents dust or foreign matter from getting into the seals of each step, and prevents galling or sticking of the sliding parts, making it impossible to expand or contract. be able to.

Further, the sealing property of each step can be kept sound. Also, it is possible that dust and foreign matter are activated when used in the furnace, but since dust and foreign matter are attracted to this foreign matter scraping part during contraction, cleaning only this part A high level of contamination of the entire cylinder can be prevented.

[Brief description of drawings]

FIG. 1A is a vertical cross-sectional view showing a first embodiment of a multistage expansion / contraction mechanism according to the present invention and a working apparatus including the mechanism in a side view, and FIG. 1B is a top view of FIG. 1A. The top view shown by the partial cross section.

FIG. 2 is a vertical cross-sectional view showing a state in which a part of the multistage expansion / contraction mechanism in FIG. 1A is extended.

FIG. 3 is a vertical cross-sectional view showing a second embodiment of a multistage expansion / contraction mechanism and a working apparatus including the mechanism according to the present invention in a partial side view.

FIG. 4A is a longitudinal sectional view showing a main part of a third embodiment of a multistage expansion / contraction mechanism and a working apparatus including the mechanism according to the present invention, and FIG. 4B is a multistage expansion / contraction mechanism in FIG. FIG. 6 is a vertical cross-sectional view showing a state when extended.

FIG. 5 is a schematic cross-sectional view showing an example of use of a working device equipped with a multistage expansion / contraction mechanism according to the present invention.

FIG. 6 is a schematic cross-sectional view showing another example of use of a working device equipped with a multistage expansion / contraction mechanism according to the present invention.

[Explanation of symbols]

1 ... Base, 2 ... Casing, 3 ... Fluid supply pipe, 4 ... Pressurizing chamber, 5 ... Pulley, 6 ... Drum, 7 ... Drum drive source, 8
… Drum drive shaft, 9… Drive shaft seal, 10
... shrinking wire, 11 ... outer cylinder, 12 ... vent hole, 13 ... sealing material, 14 ... first inner cylinder, 15 ... second inner cylinder, 16 ... third inner cylinder, 17 ... Hook, 18 ... Work jig, 19 ... Coupling member, 20 ... Winding member, 21 ... Sliding seal member, 22 ... Reactor pressure vessel, 23 ... Flange, 24 ... Stud bolt, 25 ... Shroud, 26 ... Annulus Department, 27 ...
Operation floor, 28 ... Wire, 29 ... Working device body, 30 ... Support base, 31 ... Swivel rail, 32 ... Swivel table, 33 ... Lifting hoist, 34 ... Lifting beam, 35 ... Mast, 36 ... Fixed pad, 37 … Work tools, 38… Control devices, 39
…cable.

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location G21F 9/28 ZAB 522 C

Claims (6)

[Claims] 1. A base, a pressurizing chamber provided on the base, an outer cylindrical body connected to a lower surface of the base and communicating with the pressurizing chamber, and a diameter of the outer cylindrical body sequentially reduced. A plurality of inner cylinders that are coaxially and expandably inserted, a wire provided on at least one inner cylinder of the plurality of inner cylinders, and the outer cylinder and the plurality of inner cylinders have upper and lower end portions. A multistage expansion / contraction mechanism, characterized in that the multistage expansion / contraction mechanism is provided with a sealing material provided in a portion that makes sliding contact with. 2. The multistage expansion / contraction mechanism according to claim 1, further comprising a rotating drum for winding the wire in the pressure chamber. 3. A base, a pressurizing chamber provided on the base, an outer cylinder connected to the lower surface of the base and communicating with the pressurizing chamber, and the diameter of the outer cylinder is sequentially reduced. A plurality of inner cylindrical bodies that are coaxially and extendably inserted, a sealing material provided at a portion where the plurality of inner cylindrical bodies and the outer cylindrical bodies are in sliding contact at both upper and lower ends, and the outer cylindrical body And a wire connected to the winding member, the winding member having a shape larger than the outer diameter of the inner cylindrical body and being in contact with the lower end surface of the smallest diameter inner cylindrical body of the inner cylindrical bodies. Multi-stage expansion mechanism. 4. A base, a pressurizing chamber provided on the base, an outer cylindrical body connected to the lower surface of the base and communicating with the pressurizing chamber, and the diameter of the outer cylindrical body is sequentially reduced. A plurality of inner cylinders that are coaxially and expandably inserted, a wire provided on at least one inner cylinder of the plurality of inner cylinders, and the outer cylinder and the plurality of inner cylinders have upper and lower end portions. A multistage expansion / contraction mechanism, characterized in that it comprises a seal member provided in a portion that makes sliding contact with each other, and a working jig provided at the end of the smallest-diameter inner cylindrical body among the plurality of inner cylindrical bodies. Working device equipped with. 5. A base, a pressurizing chamber provided on the base, an outer cylindrical body connected to the lower surface of the base and communicating with the pressurizing chamber, and the diameter of the outer cylindrical body is sequentially reduced. A plurality of inner cylindrical bodies that are coaxially and extendably inserted, a sealing material provided at a portion where the plurality of inner cylindrical bodies and the outer cylindrical bodies are in sliding contact at both upper and lower ends, and the outer cylindrical body Of the inner cylinder having a shape larger than the outer diameter of the inner cylinder, the winding member being in contact with the lower end surface of the inner cylinder having the smallest diameter, the wire connected to the winding member, and the plurality of inner cylinders. A working device provided with a multistage expansion / contraction mechanism, comprising: a working jig provided at the end of the smallest-diameter inner cylindrical body. 6. A working device having a multi-stage expansion / contraction mechanism according to claim 4, wherein a scraping member is provided at a sliding contact portion between the outer cylindrical body and the plurality of inner cylindrical bodies.