Fast reactor spent outer sleeve unlocking and grabbing device

Abstract

The utility model relates to the technical field of sodium-cooled fast reactor control rod assembly material loading and changing processes, in particular to a fast reactor spent outer sleeve unlocking and grabbing device which comprises an outer sleeve, an inner sleeve is arranged on the inner side of the lower section of the outer sleeve, a connecting pipe B is arranged in the outer sleeve, and the outer sleeve is used for circumferential positioning of the device; the lower section of the connecting pipe B is arranged in the inner sleeve, a star wheel is arranged at the lower end of the connecting pipe B, an ejector pin and a push rod are sequentially arranged at the lower end of the star wheel, and a claw is arranged on the outer side of the push rod and reciprocates in the axial direction along with the connecting pipe B to achieve grabbing and releasing; a torsion block is arranged at the lower end of the hook claw, the torsion block is embedded into an airplane lug of an operation head of the control rod assembly sleeve gripper, and unlocking of the sleeve gripper and the outer sleeve is completed by rotating the torsion block. Besides a gravity type automatic grabbing function, the device also has an unlocking function, and a sleeve grabbing tool of a spent control rod group and a spent outer sleeve can be rotationally unlocked and separated.

Description

Technical Field

[0001] The invention relates to the technical field of sodium-cooled fast reactor control rod assembly loading and replacement processes, and in particular to a fast reactor spent outer sleeve unlocking and grabbing device. Background Art

[0002] The sodium-cooled demonstration fast reactor control rod assembly is a split structure consisting of a moving body and an outer sleeve. The outer sleeve and sleeve gripper assembly, according to the sodium-cooled fast reactor control rod assembly loading and refueling process, requires that after the spent control rod assembly is refueled and removed from the core, the spent outer sleeve and sleeve gripper must be unlocked in the spent fuel pool in the spent fuel building, and the sleeve gripper must be transported to a storage location. The existing technology lacks tools for unlocking the spent outer sleeve and sleeve gripper assembly and for transporting the sleeve gripper. Utility Model Content

[0003] The utility model provides a fast reactor spent outer sleeve unlocking and grabbing device, which is used to solve the problem in the prior art of lacking tools for unlocking the spent outer sleeve and a sleeve grabber assembly and for transporting the sleeve grabber.

[0004] The technical solution of this utility model:

[0005] The utility model proposes a device for unlocking and grasping a spent outer sleeve of a fast reactor. The device comprises a connecting tube B, an outer sleeve, an inner sleeve, a star wheel, a hook, an ejector pin, a torsion block and a push rod. The inner sleeve is provided on the inner side of the lower section of the outer sleeve, and the connecting tube B is provided inside the outer sleeve. The outer sleeve is used for circumferential positioning of the device. The lower section of the connecting tube B is arranged inside the inner sleeve, and a star wheel is provided at the lower end of the connecting tube B. The ejector pin and the push rod are provided at the lower end of the star wheel in sequence. A hook is provided on the outer side of the push rod. The hook moves back and forth axially with the connecting tube B to realize grasping and releasing. The lower end of the hook is provided with a torsion block, and the torsion block is embedded in the aircraft ear of the operating head of the sleeve gripper. The sleeve gripper and the spent outer sleeve are unlocked by rotating the torsion block.

[0006] In some embodiments, connecting pipe B is connected to connecting pipe A through a connecting section. The connecting section and connecting pipe A are used to extend the operating distance of the device. Connecting pipe A and connecting pipe B are the main load-bearing components of the device. A lifting ring is provided at the top of connecting pipe A.

[0007] In some embodiments, a groove A is provided in the middle section of the outer sleeve, a groove B is provided in the lower section of the connecting rod, and the device is further provided with a steel ball, which is provided in the upper section of the inner sleeve. When the connecting tube B reciprocates, the steel ball switches positions between groove A and groove B, thereby realizing self-locking of the device.

[0008] In some embodiments, a spring piece and a stop pin are provided at the lower end of the star wheel, and the spring piece and the stop pin are used to maintain the angle of the star wheel after each flip.

[0009] In some embodiments, an end cap is provided at the upper end of the inner sleeve, and the end cap is used to limit the movement stroke of the connecting tube B and fix the circumferential position of the connecting tube B, the ejector pin, the push rod, and the hook claw.

[0010] In some embodiments, the device is further provided with 6 operating rods, 2 of which are connected to the outer sleeve and used to fix the outer sleeve; the remaining 4 operating rods are connected to the connecting tube A and used to rotate the connecting tube A to unlock the sleeve gripper and the control rod assembly.

[0011] In some embodiments, the lower end of the outer sleeve is a hexagonal notch, and the outer sleeve engages with the boss at the transition joint of the outer sleeve.

[0012] In some embodiments, the hook claws are of a three-petal structure and are arranged symmetrically along the axial direction, and the hook claws are used to grab the spent outer sleeve.

[0013] In some embodiments, the device is stored in a support frame, the support frame is connected to the ground of the spent fuel storage pool through expansion bolts, and the operating rod is stored in an operating rod storage box.

[0014] Beneficial effects of the utility model:

[0015] The present invention proposes a fast reactor spent outer sleeve unlocking and gripping device. In addition to the gravity-based automatic gripping function, the device also has an unlocking function that can rotate and unlock and separate the sleeve gripper of the spent control rod assembly from the spent outer sleeve. The device utilizes a torsion block embedded in the aircraft ear structure of the sleeve gripper head of the control rod assembly, and the lower end of the outer sleeve is snapped into the boss at the spent outer sleeve transition joint. Under the condition that the outer sleeve is fixed, the torsion block is controlled to rotate using an operating rod to achieve relative rotational unlocking between the sleeve gripper and the spent outer sleeve. After unlocking the sleeve gripper and the spent outer sleeve, the gripping function of the device is utilized to grab the operating head of the sleeve gripper and transport it to another storage location, completely separating the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of a fast reactor spent outer sleeve unlocking and grabbing device proposed by the utility model;

[0017] Figure 2 The utility model proposed Figure 1 The enlarged schematic diagram of the lower section;

[0018] Figure 3 The utility model proposed Figure 2 Cross-sectional view at point B;

[0019] Figure 4 The utility model proposed Figure 2 Cross-sectional view at point C;

[0020] Figure 5This is a top view of a fast reactor spent outer sleeve unlocking and grabbing device proposed by the utility model;

[0021] Figure 6 This is a schematic diagram of a support frame for a fast reactor spent outer sleeve unlocking and grabbing device proposed in the utility model.

[0022] Description of the drawings: 1. Support frame; 2. Expansion bolt; 3. Operating rod storage box; 4. Lifting ring; 5. Connecting pipe A; 6. Operating rod; 7. Connecting section; 8. Outer sleeve; 9. Connecting pipe B; 10. End cover; 11. Steel ball; 12. Star wheel; 13. Shrapnel 14. Ejector pin; 15. Push rod; 16. Hook; 17. Torsion block; 18. Inner sleeve; 19. Stop pin; 20. Groove A; 21. Groove B. DETAILED DESCRIPTION

[0023] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0024] like Figures 1 to 6 As shown, the present invention proposes a fast reactor spent outer sleeve unlocking and gripping device. The device comprises a connecting tube B9, an outer sleeve 8, an inner sleeve 18, a star wheel 12, a hook 16, an ejector pin 13, a torsion block 17, and a push rod 15. The lower end of the outer sleeve 8 has a hexagonal notch that engages with a boss at the spent outer sleeve transition joint. The outer sleeve 8 serves to circumferentially locate the device. During the unlocking process of the sleeve gripper, the outer sleeve 8 remains stationary and rotates relative to the sleeve gripper to achieve unlocking.

[0025] An inner sleeve 18 is provided on the inner side of the lower section of the outer sleeve 8, and a support frame 10 is provided on the upper end of the inner sleeve 18. The support frame 10 is used to limit the movement stroke of the connecting tube B9 and fix the circumferential position of the connecting tube B9, the ejector pin 13, the push rod 15 and the hook 16.

[0026] A connecting pipe B9 is provided inside the outer sleeve 8, and the lower section of the connecting pipe B9 is provided inside the inner sleeve 18. The connecting pipe B9 is connected to the connecting pipe A5 through the connecting section 7. The connecting section 7 and the connecting pipe A5 are used to extend the operating distance of the device. The connecting pipe A5 and the connecting pipe B9 are the main load-bearing components; a lifting ring 4 is provided at the top of the connecting pipe A5.

[0027] A groove A20 is provided in the middle section of the outer sleeve 8, and a groove B21 is provided at the lower section of the connecting pipe B9. The device is also provided with a steel ball 11, which is provided at the upper section of the inner sleeve 18. When the connecting rod B reciprocates, the steel ball 11 switches positions between the groove A20 and the groove B21, thereby realizing self-locking of the device.

[0028] A star wheel 12 is provided at the lower end of the connecting tube B9, and the two are connected by a pin. A spring piece 13 and a stop pin 19 are provided at the lower end of the star wheel 12. The spring piece and the stop pin 19 are used to maintain the angle of the star wheel 12 after each flip. The star wheel 12 rotates periodically with the pin as the rotation center, which is used to realize the switching of different motion states of the connecting tube B9, thereby controlling the opening and closing of the gripper and realizing the self-locking of the device.

[0029] The lower end of the star wheel 12 is provided with a thimble 14 and a push rod 15 in sequence. The thimble 14 applies a rotational torque to the star wheel 12, causing the star wheel 12 to rotate periodically; the push rod 15 moves up and down along the axial direction to achieve the gripping and releasing of the claw 16.

[0030] A claw 16 is located on the outside of the push rod 15. This claw 16 has a three-lobed structure and is arranged symmetrically along the axis. It is used to grasp the spent outer sleeve 8. The claw 16 reciprocates axially with the connecting tube B9 to grasp and release the spent outer sleeve. A torsion block 17 is located at the lower end of the claw 16. This torsion block 17 engages with the lug of the control rod assembly sleeve gripper's operating head. Rotating the torsion block 17 unlocks the sleeve gripper from the spent outer sleeve of the control rod assembly.

[0031] In some embodiments, the device is stored on a support frame 1, which is connected to the surface of the spent fuel storage pool via expansion bolts 2. The device also includes six operating rods 6, which are stored in an operating rod storage box 3. Two operating rods 6 are connected to and used to secure the outer sleeve 8; the remaining four operating rods 6 are connected to a connecting tube A5 and used to rotate the connecting tube A5 to unlock the sleeve gripper from the control rod assembly's spent outer sleeve 8. During use, the operating rods 6 are respectively connected to the connecting tube A5 and the outer sleeve 8 to manually control the relative rotation of the outer sleeve 8 and the intermediate gripper. The operator holds the operating rods 6 to fix the relative position of the gripper and outer sleeve 8, and rotates the connecting tube A5 using the operating rods 6 to rotate the gripper component to a certain angle, ultimately unlocking and separating the outer sleeve 8 from the sleeve gripper.

[0032] The utility model provides a fast reactor spent outer sleeve unlocking and grabbing device, which has not only a gravity-type automatic grabbing function but also an unlocking function, and can rotate the sleeve gripper of the spent control rod group and the spent outer sleeve to unlock and separate them.

[0033] like Figures 1 to 6 As shown, the utility model proposes a fast reactor spent outer sleeve unlocking and grabbing device, and the implementation method of the device is as follows:

[0034] Step 1: The operator enters the spent fuel storage pool area and operates the crane to connect the sling and electronic scale. He then locates the fast reactor spent outer sleeve unlocking grabbing device on the connection support frame 1 and records the A kg displayed on the electronic scale.

[0035] Step 2: Operate the crane to fully lift the device and transfer it to the control rod assembly that needs to be unlocked.

[0036] Step 3: Align the hexagonal notch at the lower end of the outer sleeve 8 of the unlocking and grabbing tool with the positioning block of the outer sleeve of the control rod assembly below, and slowly lower the device until both are fully in place and locked.

[0037] Step 4: Operate the crane to continue lowering the device until the aircraft ear structure of the sleeve gripper operating head is embedded in the slot of the torsion block 17. The descending distance can be used to determine whether it has descended to the correct position.

[0038] Step 5: Operate the crane to slightly lift the device to avoid placing the weight of the device completely on the control rod assembly.

[0039] Step 6: The operator installs the operating rod 6 on the outer sleeve 8 and the connecting pipe A5 respectively.

[0040] Step 7: The operator keeps the operating rod 6 on the outer sleeve 8 fixed and rotates the operating rod 6 on the connecting pipe A5 to a certain angle.

[0041] Step 8: Slowly lift the crane, lift the device and the sleeve gripper, and separate the sleeve gripper from the lowering grid insert.

[0042] Step 9: Operate the crane to locate the storage location of the required storage sleeve gripper, and lower the device until the weight displayed on the electronic scale is 0.

[0043] Step 10: Lift the device and observe the weight on the electronic scale as A Kg to confirm that the device is detached from the sleeve gripper.

[0044] Step 11: Transfer the device to the support frame 1 and put it back in place.

[0045] The embodiments of the present invention are described in detail above. The present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A fast reactor spent outer sleeve unlocking and grabbing device, characterized in that: The device includes a connecting tube B, an outer sleeve, an inner sleeve, a star wheel, a hook, a thimble, a torsion block and a push rod. The inner sleeve is provided inside the lower section of the outer sleeve, and the connecting tube B is provided inside the outer sleeve. The outer sleeve is used for circumferential positioning of the device; the lower section of the connecting tube B is sleeved inside the inner sleeve, and the star wheel is provided at the lower end of the connecting tube B, and the thimble and push rod are provided at the lower end of the star wheel in sequence, and a hook is provided on the outside of the push rod, and the hook reciprocates axially with the connecting tube B to achieve grasping and releasing; a torsion block is provided at the lower end of the hook, and the torsion block is embedded in the aircraft ear of the operating head of the sleeve gripper, and the unlocking of the sleeve gripper and the exhausted outer sleeve is completed by rotating the torsion block.

2. The device for unlocking and grabbing the spent outer sleeve of a fast reactor according to claim 1, characterized in that: The connecting pipe B is connected to the connecting pipe A through a connecting section. The connecting section and the connecting pipe A are used to extend the operating distance of the device. The connecting pipe A and the connecting pipe B are the main load-bearing components of the device. A lifting ring is provided at the top of the connecting pipe A.

3. The fast reactor spent outer sleeve unlocking and grabbing device according to claim 1, characterized in that: The outer sleeve has a groove A in the middle, the connecting pipe B has a groove B in the lower part, and the device is further provided with a steel ball, which is arranged in the upper part of the inner sleeve. When the connecting rod B reciprocates, the steel ball switches positions between groove A and groove B, thereby realizing self-locking of the device.

4. The fast reactor spent outer sleeve unlocking and grabbing device according to claim 1, characterized in that: A spring piece and a stop pin are provided at the lower end of the star wheel, and the spring piece and the stop pin are used to maintain the angle of the star wheel after each flip.

5. The fast reactor spent outer sleeve unlocking and grabbing device according to claim 1, characterized in that: An end cover is provided at the upper end of the inner sleeve, and the end cover is used to limit the movement stroke of the connecting tube B and fix the circumferential positions of the connecting tube B, the ejector pin, the push rod, and the hook claw.

6. The fast reactor spent outer sleeve unlocking and grabbing device according to claim 1, characterized in that: The device is also provided with 6 operating rods, 2 of which are connected to the outer sleeve and used to fix the outer sleeve; the remaining 4 operating rods are connected to the connecting tube A and used to rotate the connecting tube A to unlock the sleeve gripper and the outer sleeve of the control rod assembly.

7. The fast reactor spent outer sleeve unlocking and grabbing device according to claim 1, characterized in that: The lower end of the outer sleeve is a hexagonal notch, and the outer sleeve is engaged with the boss at the transition joint of the exhausted outer sleeve.

8. The device for unlocking and grabbing the spent outer sleeve of a fast reactor according to claim 1, characterized in that: The hook claws are of a three-petal structure and are arranged symmetrically along the axial direction. The hook claws are used to grab the sleeve gripper.

9. The fast reactor spent outer sleeve unlocking and grabbing device according to claim 6, characterized in that: The device is stored in a support frame, and the support frame is connected to the ground of the spent fuel storage pool through expansion bolts. The operating rod is stored in an operating rod storage box.

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