CN217453946U

CN217453946U - Telescopic expansion claw of single cylinder

Info

Publication number: CN217453946U
Application number: CN202123334276.8U
Authority: CN
Inventors: 程檀; 周政; 陈政文; 胡娜
Original assignee: China Nuclear Power Operation Technology Corp Ltd
Current assignee: China Nuclear Power Operation Technology Corp Ltd
Priority date: 2021-12-28
Filing date: 2021-12-28
Publication date: 2022-09-20
Anticipated expiration: 2031-12-28

Abstract

The utility model relates to a nuclear power plant's steam generator overhauls the field, concretely relates to scalable claw that expands of single cylinder. The device comprises a cylinder, an expansion rod, an expansion claw return spring and an expansion rod return spring; the cylinder in be equipped with the claw that expands, be provided with the expander roll in the claw that expands, the bottom of claw that expands has an annular boss, the bottom of claw that expands is equipped with the push rod, the bottom of push rod has an annular boss, the cover is equipped with the claw reset spring that expands on the push rod between the annular boss of push rod and the annular boss of claw that expands, the cover is equipped with the expander roll reset spring between the annular boss of push rod and the tip that has the through-hole of cylinder. The beneficial effects of the utility model reside in that: the structure is simple, the size is compact, and the steam generator is suitable for various types of steam generators; the expansion claw can realize the functions of expansion, grasping and releasing actions on the premise of simplifying the structure of the expansion claw and reducing the size and weight of the expansion claw.

Description

Telescopic expansion claw with single cylinder

Technical Field

The utility model relates to a nuclear power plant's steam generator overhauls the field, concretely relates to scalable claw that expands of single cylinder.

Background

The Steam Generator (SG) is used as the pressure boundary of the first and second loops of the nuclear power plant, is the core part of the heat exchange between the radioactive coolant of the first loop and the non-feedwater of the second loop, and is also a radioactive protection barrier for preventing the two loops from being polluted. The operation experience of nuclear power plants at home and abroad shows that the problem of degradation of the heat transfer pipe cannot be completely eliminated, so that on the basis of periodically checking the integrity of the heat transfer pipe, the damaged or defective heat transfer pipe needs to be blocked to be taken out of service, thereby ensuring that SG can safely and reliably operate.

In order to reduce the exposure dose of personnel, an automatic pipe plugging mode that pipe plugging equipment is carried by a mechanical arm to implement pipe plugging operation is generally adopted at present, and an operator does not need to enter a SG primary side. Under the circumstances such as stifled pipe equipment dead weight is great or stifled pipe in-process reaction force is great, need set up supplementary claw that expands on stifled pipe equipment to share load for the arm.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the supplementary claw demand that expands in the automatic stifled pipe operation of nuclear power plant SG, aim at provides a single cylinder scalable claw that expands, and this claw that expands uses single cylinder to carry out the two-stage drive, can simplify expand the claw structure, reduce under the prerequisite of expanding claw size and weight, realize expanding the claw flexible, grab and hold and release the action function.

The technical scheme of the utility model as follows: a single-cylinder telescopic expansion claw comprises a cylinder, an expansion rod, an expansion claw reset spring and an expansion rod reset spring; the cylinder in be equipped with the claw that expands, be provided with the expander roll in the claw that expands, the bottom of claw that expands has an annular boss, the bottom of claw that expands is equipped with the push rod, the bottom of push rod has an annular boss, the cover is equipped with the claw reset spring that expands on the push rod between the annular boss of push rod and the annular boss of claw that expands, the cover is equipped with the expander roll reset spring between the annular boss of push rod and the tip that has the through-hole of cylinder.

The cylinder be the hollow structure of tube-shape, the one end of cylinder is sealed, and the other end is opened has the through-hole, the inside cover of cylinder is equipped with the claw that expands.

The expansion claw is a bolt-shaped structure, a through hole is formed in the expansion claw, an expansion rod is arranged in the expansion claw, and the appearance of the expansion rod is matched with the through hole in the expansion claw.

And a limit pin is arranged between the expansion claw and the expansion rod.

The head of the expansion rod is of a conical structure.

The section of the push rod is T-shaped.

The beneficial effects of the utility model reside in that: the structure is simple, the size is compact, and the steam generator is suitable for various types of steam generators; the expansion claw can realize the functions of expansion, grasping and releasing actions on the premise of simplifying the structure of the expansion claw and reducing the size and weight of the expansion claw.

Drawings

Fig. 1 is a schematic structural view of a single-cylinder telescopic expansion claw provided by the present invention;

fig. 2 is a schematic diagram of the plug transmission process of the present invention.

In the figure: the expansion device comprises a cylinder 1, an expansion rod 2, an expansion claw 3, a limiting pin 4, an expansion claw reset spring 5 and an expansion rod reset spring 6.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

The utility model discloses to the supplementary claw demand that expands in the automatic stifled pipe operation of nuclear power plant SG, provided a scalable claw that expands of single cylinder, this claw that expands uses single cylinder to carry out the two-stage drive, can simplify expand the claw structure, reduce under the prerequisite of expanding claw size and weight, realize expanding the claw flexible, grab and hold and release the action function. The utility model discloses to the supplementary claw demand that expands in the automatic stifled pipe operation of nuclear power plant SG, provided a scalable claw that expands of single cylinder, this claw that expands uses single cylinder to carry out the two-stage drive, can simplify expand the claw structure, reduce under the prerequisite of expanding claw size and weight, realize expanding the claw flexible, grab and hold and release the action function.

The utility model uses a single cylinder to carry out two-stage driving, when the cylinder is ventilated, the first stage driving stroke drives the expansion claw to extend into the heat transfer pipe hole, and the second stage stroke drives the expansion claw to expand and grasp; when the cylinder exhausts, the expansion claw firstly retreats the second-stage stroke to complete the release of the expansion claw under the action of the spring, and then retreats the second-stage stroke to complete the retraction of the expansion claw.

As shown in fig. 1, the single-cylinder telescopic expansion claw comprises a cylinder 1, an expansion rod 2, an expansion claw 3, a limit pin 4, an expansion claw return spring 5 and an expansion rod return spring 6. The cylinder 1 be the hollow structure of tube-shape, the one end of cylinder 1 is sealed, the other end is opened there is the through-hole, the inside cover of cylinder 1 is equipped with the claw 3 that expands, the claw 3 that expands is the inside through-hole that opens of bolt column structure, the inside expander roll 2 that is provided with of claw 3 that expands, the appearance and the inside through-hole phase-match of claw 3 that expands of expander roll 2, be equipped with spacer pin 4 between claw 3 and the expander roll 2 that expands, the head of expander roll 2 is the toper structure, the bottom of claw 3 that expands has an annular boss, the bottom cover of claw 3 that expands is equipped with push rod 7, the cross-section of push rod 7 is the T type, the bottom of push rod 7 has an annular boss, the cover is equipped with claw reset spring 5 that expands on the push rod 7 between the annular boss of push rod 7 and the annular boss of claw 3 that expands, the cover is equipped with expander roll reset spring 6 between the annular boss of push rod 7 and the tip that has the through-hole of cylinder 1.

The working process of the utility model is as follows:

the working process of the present invention is described in detail below with reference to fig. 1 and 2:

a limit pin 4 is arranged between the expansion claw 3 and the expansion rod 2; the limiting pin 4 is fixedly arranged on the expansion claw 3, passes through a slotted hole formed in the expansion rod 2 and only moves within the range of the slotted hole of the expansion rod 2, so that the expansion claw 3 is prevented from being separated from the expansion rod 2 in the movement process. Meanwhile, in the retracting process of the expansion claw, the limiting pin 4 is a fulcrum for the expansion rod to pull the expansion claw 3 to retract.

When the cylinder 1 ventilates, compressed air drives the expansion rod 2 to drive the expansion claw 3 to move upwards, and the process is as follows:

in the range of the first-stage stroke L1, an expansion claw reset spring 5 pushes an expansion claw 3 to eject out, and in the process, a limiting pin 4 fixes the relative position of the expansion claw 3 and an expansion rod 2 to realize toe extension.

Secondly, in the range of a second-stage stroke L2, the lower end face of the expansion claw 3 clings to the air cylinder 1 to stop moving, the expansion rod 2 continues to move upwards under the driving of compressed air and expands the expansion claw 3 through a conical surface structure at the front end, and toe grasping is achieved.

When the cylinder 1 exhausts, the two-stage spring pushes the expansion rod 2 and the expansion claw 3 to retract, and the process is as follows:

firstly, the expansion rod 2 firstly retracts under the action of an expansion claw return spring 5, so that the expansion claw 3 contracts to realize toe loosening;

and secondly, after toes are loosened, the expansion rod reset spring 6 pushes the expansion rod 2 to retreat for a first stroke L1, and the expansion rod 2 pulls the expansion claw 3 to retreat through the limit pin 4, so that the toes are retracted.

In the extending process of the expansion claw 3, the expansion claw reset spring 5 pushes the expansion claw 3 to eject, and the elastic force exerted on the expansion claw 3 by the expansion claw reset spring 5 is larger than the friction force between the expansion claw 3 and the cylinder.

The expanding claw 3 contracts from an expanding state, and the elastic force of the expanding claw reset spring 5 is larger than the friction force between the expanding claw 3 and the expanding rod 2.

Claims

1. The utility model provides a scalable claw that expands of single cylinder which characterized in that: the device comprises a cylinder, an expansion rod, an expansion claw reset spring and an expansion rod reset spring; the cylinder in be equipped with the claw that expands, be provided with the expander roll in the claw that expands, the bottom of claw that expands has an annular boss, the bottom of claw that expands is equipped with the push rod, the bottom of push rod has an annular boss, the cover is equipped with the claw reset spring that expands on the push rod between the annular boss of push rod and the annular boss of claw that expands, the cover is equipped with the expander roll reset spring between the annular boss of push rod and the tip that has the through-hole of cylinder.

2. A single cylinder telescopic expansion jaw according to claim 1, characterized in that: the cylinder be the hollow structure of tube-shape, the one end of cylinder is sealed, and the other end is opened has the through-hole, the inside cover of cylinder is equipped with the claw that expands.

3. A single cylinder telescopic expansion jaw according to claim 1, characterized in that: the expansion claw is of a bolt-shaped structure, a through hole is formed in the expansion claw, an expansion rod is arranged in the expansion claw, and the appearance of the expansion rod is matched with the through hole in the expansion claw.

4. A single cylinder telescopic expansion jaw according to claim 1, characterized in that: and a limit pin is arranged between the expansion claw and the expansion rod.

5. A single cylinder telescopic expansion jaw according to claim 1, characterized in that: the head of the expansion rod is of a conical structure.

6. A single cylinder telescopic expansion jaw according to claim 1, characterized in that: the section of the push rod is T-shaped.

7. A single cylinder telescopic expansion jaw according to claim 2, characterized in that: the expansion claw is a bolt-shaped structure, a through hole is formed in the expansion claw, an expansion rod is arranged in the expansion claw, and the appearance of the expansion rod is matched with the through hole in the expansion claw.

8. A single cylinder telescopic expansion jaw according to claim 2, characterized in that: and a limit pin is arranged between the expansion claw and the expansion rod.

9. A single cylinder telescopic expansion jaw according to claim 2, characterized in that: the head of the expansion rod is of a conical structure.

10. A single cylinder telescopic expansion jaw according to claim 2, characterized in that: the section of the push rod is T-shaped.