A tool for unlocking the control rod drive rod

Abstract

A tool for unlocking a control rod drive rod comprises a first control structure and a second control mechanism. When in use, the first control structure approaches the control rod drive rod relative to the second control mechanism first. The first control structure comprises a first mounting seat on which a first gripper is mounted. The first mounting seat is a hollow cylindrical structure. The first gripper is rotatably connected to the first mounting seat. The rotation axis of the first gripper is parallel to the central axis of the first mounting seat. A first control sleeve is arranged outside the first mounting seat and is rotatably arranged relative to the first mounting seat. An empty space is arranged on the outer wall of the first control sleeve. The tail of the first gripper is arranged in the empty space. The rotation of the first control sleeve can drive the first gripper to rotate.

Description

Technical Field

[0001] The present invention relates to a tool for unlocking a control rod drive rod. Background Art

[0002] Existing nuclear power units have hundreds of fuel assemblies, each of which houses dozens of control assemblies. Each is driven by a corresponding number of control rod drive mechanisms, each mechanically connected to the control rod assembly. During overhauls, this connection must be disconnected before unloading and reconnected after loading. Currently, pneumatic unlocking tools are used, but these tools present several challenges: They require more than seven people to operate simultaneously, resulting in high labor costs. The workstation is located above the refueling pool, requiring high levels of protection against foreign matter. The large number of people working overtime increases the risk of unnecessary foreign matter. The workstation is located above the refueling pool, resulting in high radioactivity levels. The large number of people working overtime increases unnecessary doses. Therefore, there is an urgent need to design a tool for unlocking the control rod drive rods to address these issues. Summary of the Invention

[0003] The purpose of the present invention is to solve the problems existing in the prior art, improve the working efficiency of unlocking the control rod drive rod, reduce the risk of foreign matter and the radiation dose to personnel, and reduce maintenance costs.

[0004] The present invention adopts the following technical solution: a tool for unlocking a control rod drive rod, comprising a first control structure and a second control mechanism. During use, the first control structure approaches the control rod drive rod relative to the second control mechanism. The first control structure includes a first mounting seat on which a first gripper is mounted. The first mounting seat is a hollow cylindrical structure. The first gripper is rotatably connected to the first mounting seat, and the rotation axis of the first gripper is parallel to the central axis of the first mounting seat. A first control sleeve is provided on the outside of the first mounting seat and is rotatably arranged relative to the first mounting seat. The outer wall of the first control sleeve has a space, and the tail of the first gripper is disposed within the space. Rotation of the first control sleeve can drive the first gripper to rotate. The second control mechanism includes a second mounting seat, a second gripper is rotatably provided at one end of the second mounting seat, and the rotation axis of the second gripper is perpendicular to the central axis of the first mounting seat. The second control mechanism also includes a second driving rod that drives the second gripper to rotate. The second driving rod axially moves to drive the second gripper to rotate. The gripping position formed by the first gripper and the gripping position formed by the second gripper are coaxially arranged.

[0005] Among them, it also includes a motor, which drives a nut through a worm gear transmission structure. The nut can be circumferentially rotated and maintained on the base plate. The nut is threadedly connected to the screw rod, and the screw rod drives the second drive rod. The motor is fixedly connected to the base plate, and the first control sleeve is rotatably arranged with the base plate.

[0006] Wherein, the second mounting seat is arranged in a cylinder, and the cylinder is fixedly connected to the first mounting seat.

[0007] The first mounting seat is axially movable and is disposed in the cylinder. Limiting blocks for limiting the movable travel of the first mounting seat are provided at both ends of the movable travel of the first mounting seat.

[0008] The screw rod and the second driving rod are fixedly connected by a tubular nut.

[0009] When the second gripper grips the control rod driving rod, the motor drives the lead screw to move and press the second mounting seat tightly into the cylinder.

[0010] Among them, the second driving rod includes a driving head, and the second claw includes a first contact surface that drives the second claw to rotate forward after contacting the driving head and a second contact surface that drives the second claw to rotate reversely after contacting the driving head. The first contact surface and the second contact surface are located on both sides of the second claw's rotation axis.

[0011] When the second driving rod is away from the second mounting seat, the second driving rod contacts the second mounting seat, thereby driving the second mounting seat to move in a direction away from the second mounting seat.

[0012] The invention also includes a spring which applies a force to the second mounting seat to move toward the first mounting seat.

[0013] Compared with the existing technology, the present invention has the following advantages: the technical solution of the present invention reduces the risk of foreign matter, reduces the radiation dose to personnel, improves work efficiency, and reduces work costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention.

[0015] Figure 2 It is a structural schematic diagram of the first control structure and the second control mechanism of the present invention. DETAILED DESCRIPTION

[0016] The present invention is described in detail below with reference to specific embodiments.

[0017] Example 1:

[0018] like Figure 1 and 2As shown, the tool for unlocking a control rod drive rod described in this embodiment includes a first control structure and a second control mechanism. During use, the first control structure approaches the control rod drive rod relative to the second control mechanism. The control rod drive rod is the target object to be unlocked and is not the content of the present invention, but is the object of the present invention. The first control structure includes a first mounting seat 11 on which the first gripper 1 is mounted. The first mounting seat 11 is a hollow cylindrical structure. The first gripper 1 is rotatably connected to the first mounting seat 11. The rotation axis of the first gripper 1 is parallel to the central axis of the first mounting seat 11. A first control sleeve 12 is provided on the outside of the first mounting seat 11 and is circumferentially rotatable relative to the first mounting seat 11. The outer wall of the first control sleeve 12 is provided with a space 120. The tail of the first gripper 1 is provided in the space 120. The rotation of the first control sleeve 12 can drive the first gripper 1 to rotate. The space 120 in this embodiment is a hole with an outer edge. When the first control sleeve 12 rotates, the outer edge contacts the tail of the first gripper 1, thereby driving the first gripper 1 to rotate. Preferably, the tail of the first gripper 1 is provided with a rotatable roller. The outer edge contacts the roller, and the rolling friction between the two reduces the resistance. In this embodiment, the second control mechanism includes a second mounting base 2, with a rotatable second gripper 21 disposed at one end. The rotation axis of the second gripper 21 is perpendicular to the central axis of the first mounting base 11. The second gripper 21 also includes a second drive rod 22 that drives the second gripper 21. The axial movement of the second drive rod 22 drives the rotation of the second gripper 21. In this embodiment, the gripping position formed by the first gripper 1 and the gripping position formed by the second gripper 21 are coaxially arranged. In this embodiment, the first gripper 1 rotates by rotating the first control sleeve 12, thereby clamping the first clamped portion of the control rod drive rod. Operating the second drive rod 22 drives the second gripper 21 to clamp the second clamped portion of the control rod drive rod. This achieves clamping of the control rod drive rod. Reversing the rotation of the first control sleeve 12 and reversing the operation of the second drive rod 22 loosens the control rod drive rod. Preferably, the first control sleeve 12 is coaxially fixed to the first tubeset 13, which extends toward the base plate 35 and is rotatable relative to the base plate 35.

[0019] In this embodiment, the gripping position formed by the first gripper 1 refers to a circular enclosure formed by two or three or more first grippers 1 arranged in a ring shape, and the gripping position is the center position of the circular enclosure. The gripping position formed by the second gripper 21 is the same as the gripping position formed by the first gripper 1 described above.

[0020] This embodiment also includes a motor 3, which drives a nut 33 through a worm gear transmission structure. Preferably, the worm gear 32 and worm gear 31 transmission structure includes a worm 31 fixedly connected to the rotating shaft of the motor 3, the worm gear 32 is rotatably connected to the base plate 35, and the nut 33 is fixedly connected to the worm gear 32. The nut 33 is rotatably maintained on the base plate 35. The nut 33 is threadedly connected to the screw rod 34, and the circumferential rotation of the screw rod is restricted. The screw rod 34 can only move axially. The axial movement of the screw rod 34 drives the second drive rod 22. The motor 3 is fixedly connected to the base plate 35, and the first control sleeve 12 is rotatably arranged with the base plate 35. Preferably, the motor 3 is connected to a torque limiter, which detects the torque of the motor. When the torque is too large, it indicates that it has been tightened, thereby stopping the operation of the motor. A second tube assembly 132 is disposed within the first tube assembly 13 and is coaxially disposed with the first tube assembly 13. One end of the second tube assembly 132 is fixedly connected to the base plate 35, and the other end of the second tube assembly 132 is fixedly connected to the first mounting base 11. Preferably, the screw rod 34 is connected to the second tube assembly 132 by a stop pin, which restricts circumferential rotation of the screw rod 34 and is slidably connected to the second tube assembly 132.

[0021] In this embodiment, the second mounting seat 2 is disposed in a cylinder 4 , and the cylinder 4 is fixedly connected to the first mounting seat 11 .

[0022] In this embodiment, the first mounting seat 11 is axially movable within the cylinder 4, and limit blocks 111 are provided at both ends of the first mounting seat 11's movable range to limit the first mounting seat 11's movable range. Preferably, the limit blocks 111 reduce the space so that the first mounting seat 11 cannot escape from the original movable space.

[0023] In this embodiment, the screw rod 34 is fixedly connected to the second driving rod 22 by a tubular nut 33'. In this embodiment, the distance between the screw rod 34 and the second driving rod 22 can be controlled by adjusting the tubular nut 33', thereby achieving adjustment.

[0024] In this embodiment, when the second gripper 21 grips the control rod driving rod, the motor 3 drives the screw rod 34 to move and press the second mounting seat 2 into the cylinder 4 .

[0025] In this embodiment, the second drive rod 22 includes a drive head 221. The second gripper 21 includes a first contact surface 211 that drives the second gripper 21 in a forward rotation upon contact with the drive head 221, and a second contact surface 212 that drives the second gripper 21 in a reverse rotation upon contact with the drive head 221. The first contact surface 211 and the second contact surface 212 are located on opposite sides of the rotation axis of the second gripper 21. In this embodiment, the movement of the second drive rod 22 can control both clamping and loosening of the control rod drive rod.

[0026] In this embodiment, when the second driving rod 22 moves away from the second mounting seat 2 , the second driving rod 22 contacts the second mounting seat 2 and drives the second mounting seat 2 to move away from the second mounting seat 2 .

[0027] This embodiment further includes a spring 5 that applies a force to the second mounting base 2 toward the first mounting base 11. In this embodiment, the force exerted by the spring 5 on the second mounting base 2 is opposite to the force exerted by the second drive rod 22 on the second mounting base 2. These two opposing forces allow the second mounting base 2 to always move between two states, thereby preventing the second gripper 21 from being locked.

[0028] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various variations or modifications within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A tool for unlocking a control rod drive rod, characterized in that: The invention comprises a first control structure and a second control mechanism. When in use, the first control structure is closer to the control rod driving rod than the second control mechanism. The first control structure comprises a first mounting seat with a first gripper installed. The first mounting seat is a hollow cylindrical structure. The first gripper is rotatably connected with the first mounting seat. The rotation axis of the first gripper is parallel to the central axis of the first mounting seat. A first control sleeve is arranged outside the first mounting seat and is rotatably arranged relative to the first mounting seat. An empty space is arranged on the outer wall of the first control sleeve. The tail of the first gripper is arranged in the empty space. The rotation of the first control sleeve can drive the first gripper to rotate. The second control mechanism includes a second mounting seat, a second gripper rotatably arranged at one end of the second mounting seat, a rotation axis of the second gripper being perpendicular to the central axis of the first mounting seat, and a second driving rod driving the second gripper to rotate, the second driving rod axially moving to drive the second gripper to rotate; The gripping position formed by the first gripping claw and the gripping position formed by the second gripping claw are coaxially arranged.

2. A tool for unlocking a control rod drive rod according to claim 1, characterized in that: It also includes a motor, which drives a nut through a worm gear transmission structure. The nut can be rotatably maintained on the base plate. The nut is threadedly connected to the screw rod, which drives the second drive rod. The motor is fixedly connected to the base plate, and the first control sleeve is rotatably arranged with the base plate.

3. A tool for unlocking a control rod drive rod according to claim 1, characterized in that: The second mounting seat is arranged in a cylinder, and the cylinder is fixedly connected to the first mounting seat.

4. A tool for unlocking a control rod drive rod according to claim 1, characterized in that: The first mounting seat is movably arranged in the cylinder along the axial direction, and limit blocks for limiting the moving stroke of the first mounting seat are arranged at both ends of the moving stroke of the first mounting seat.

5. A tool for unlocking a control rod drive rod as claimed in claim 1, characterized in that: The lead screw and the second driving rod are fixedly connected by a tubular nut.

6. A tool for unlocking a control rod drive rod according to claim 1, characterized in that: When the second gripper grips the control rod driving rod, the motor drives the lead screw to move and press the second mounting seat tightly into the cylinder.

7. A tool for unlocking a control rod drive rod according to claim 1, characterized in that: The second driving rod includes a driving head, and the second claw includes a first contact surface that drives the second claw to rotate forward after contacting the driving head and a second contact surface that drives the second claw to rotate reversely after contacting the driving head. The first contact surface and the second contact surface are located on both sides of the second claw's rotation axis.

8. A tool for unlocking a control rod drive rod according to claim 1, characterized in that: When the second driving rod is away from the second mounting seat, the second driving rod contacts the second mounting seat to drive the second mounting seat to move in a direction away from the second mounting seat.

9. A tool for unlocking a control rod drive rod as claimed in claim 1, characterized in that: It also includes a spring that applies a force to the second mounting seat to move toward the first mounting seat.

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