Fast reactor control rod spent tool sleeve hoisting device

Abstract

The utility model belongs to the technical field of sodium-cooled fast reactor control rod assembly material loading and changing processes, and particularly relates to a fast reactor control rod spent tool sleeve hoisting 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 rod B is arranged in the outer sleeve, and claws are arranged at the lower end of the outer sleeve and are symmetrically arranged in the circumferential direction in the axis direction. Each claw is of an outwards-turned structure, a protruding structure is arranged at the top end of each claw, and the protruding structures are matched with the meshing part of the spent tool sleeve; the lower section of the connecting rod B is arranged in the inner sleeve, the lower end of the connecting rod B is connected with the star wheel, and the connecting rod B conducts reciprocating motion to achieve opening and closing of the hook claws. A push rod is arranged at the bottom of the inner sleeve, an ejector pin is arranged at the upper end of the push rod, and the push rod reciprocates in the axial direction to sequentially push the ejector pin, the star wheel and the connecting rod B to control opening and closing of the hook claws. The device meets the field requirements of the sodium-cooled fast reactor, fills up the gap of equipment, and fills up the blank of the domestic split type control rod assembly transfer process.

Description

Technical Field

[0001] The utility model belongs to the technical field of the refueling process technology of sodium-cooled fast reactor control rod assemblies, and particularly relates to a lifting device for a spent tool sleeve of a fast reactor control rod. Background Art

[0002] The control rod assembly of the sodium-cooled demonstration fast reactor has a split structure, which is composed of a moving body and an outer sleeve. Among them, the moving body and the tool sleeve are of a combined structure. According to the refueling process of the sodium-cooled fast reactor control rod assembly, after the tool sleeve of the control rod assembly and the moving body assembly are transferred out of the core during refueling, the spent tool sleeve needs to be unlocked from the moving body in the spent fuel pool of the spent fuel building. In the prior art, the unlocked spent tool sleeve cannot be lifted and transported alone, and there is a lack of tools in the spent fuel building for lifting it. Therefore, a lifting device needs to be designed to separately grab and transfer the spent tool sleeve of the control rod after unlocking. Summary of the Utility Model

[0003] The utility model provides a lifting device for a spent tool sleeve of a fast reactor control rod, which is used to solve the problem that there is a lack of tools in the prior art for grabbing and transferring the spent tool sleeve in the spent fuel building.

[0004] Technical Solution of the Utility Model

[0005] The utility model provides a lifting device for a spent tool sleeve of a fast reactor control rod. The device includes a connecting rod B, an outer sleeve, an inner sleeve, a star wheel, a hook claw, a thimble and a push rod. An inner sleeve is arranged inside the lower section of the outer sleeve. A connecting rod B is arranged inside the outer sleeve. A hook claw is arranged at the lower end of the outer sleeve. The hook claw has three petals and is circumferentially symmetrically arranged along the axial direction. The hook claw is of an outward-turning structure, and a protruding structure is arranged at the top of the hook claw. The lower section of the connecting rod B is arranged inside the inner sleeve. The lower end of the connecting rod B is connected to the star wheel. The connecting rod B reciprocates along the axis to realize the opening and closing of the hook claw. A push rod is arranged at the bottom of the inner sleeve. A thimble is arranged at the upper end of the push rod. The push rod reciprocates along the axis, and sequentially pushes the thimble, the star wheel and the connecting rod B to control the opening and closing of the hook claw.

[0006] In some embodiments, the connecting rod B is connected to the connecting rod A through a connecting section. The connecting section and the connecting rod A are used to lengthen the operating distance of the device, so that the operator can operate the underwater equipment above the pool.

[0007] In some embodiments, a groove A is arranged at the middle section of the outer sleeve, and a groove B is arranged at the lower section of the connecting rod B. The device also includes steel balls, which are arranged at the upper section of the inner sleeve. The steel balls switch positions between the groove A and the groove B when the connecting rod B reciprocates, so as to realize the self-locking of the device.

[0008] In some embodiments, a groove is provided at the middle section of the connecting rod B, and a pin is provided in the groove. The pin slides in the groove, and the operating state of the connecting rod is judged by observing the stroke position of the pin in the groove.

[0009] In some embodiments, a guiding head is provided at the lower end of the outer sleeve. The guiding head guides the device when it enters the spent tool sleeve, and is used to position the spent tool sleeve for the device.

[0010] In some embodiments, a lifting ring is provided at the top end of the connecting rod A.

[0011] In some embodiments, 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.

[0012] In some embodiments, the protruding structure of the hook claw is matched with the meshing part of the spent tool sleeve.

[0013] Advantages of the present utility model:

[0014] The present utility model provides a lifting device for a spent tool sleeve of a fast reactor control rod. Through the axial reciprocating motion of the push rod, the star wheel rotation and the connecting pipe B, the opening and closing of the hook claw are realized, so as to achieve the purpose of separately grasping and transporting the unlocked spent tool sleeve of the control rod. This device meets the on-site requirements of the sodium-cooled fast reactor, fills the equipment gap, and makes up for the domestic blank in the transfer process of the split control rod assembly. Description of the drawings

[0015] Figure 1 Schematic diagram of the extended state of the connecting rod B of a lifting device for a spent tool sleeve of a fast reactor control rod proposed in an embodiment of the present utility model;

[0016] Figure 2 Schematic diagram of the retracted state of the connecting rod B of a lifting device for a spent tool sleeve of a fast reactor control rod proposed in an embodiment of the present utility model;

[0017] Figure 3 Top view of a lifting device for a spent tool sleeve of a fast reactor control rod proposed in an embodiment of the present utility model;

[0018] Figure 4 Schematic diagram of the support frame of a lifting device for a spent tool sleeve of a fast reactor control rod proposed in an embodiment of the present utility model;

[0019] Description of the drawings: 1. Support frame; 2. Expansion bolt; 3. Lifting ring; 4. Connecting rod; 5. Connecting section A; 6. Connecting rod B; 7. Pin; 8. Star wheel; 9. Outer sleeve; 10. Thimble; 11. Guiding head; 12. Steel ball; 13. Inner sleeve; 14. Thimble; 15. Hook claw; 16. Push rod; 17. Groove A; 18. Groove B. Detailed implementation manners

[0020] The present utility model will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0021] As Figures 1 to 3 shown, the present utility model provides a lifting device for a spent tool sleeve of a fast reactor control rod. The device includes a connecting rod B6, an outer sleeve 9, an inner sleeve 13, a star wheel, a hook claw 15, a support frame 10, and a push rod 16. An inner sleeve 13 is provided inside the lower section of the outer sleeve 9. A connecting rod B6 is provided inside the outer sleeve 9. A hook claw 15 is provided at the lower end of the outer sleeve 9. The hook claw 15 has three petals and is circumferentially symmetrically arranged along the axial direction. The hook claw 15 has an outward-turning structure. A protruding structure is provided at the top of the hook claw 15, and the protruding structure is matched with the meshing part of the spent tool sleeve. The lower section of the connecting rod B6 is arranged inside the inner sleeve 13. The lower end of the connecting rod B6 is connected to the star wheel. The reciprocating movement of the connecting rod B6 realizes the opening and closing of the hook claw 15. A groove is provided at the middle section of the connecting rod B6, and a pin 7 is provided in the groove. The pin 7 slides in the groove, and the operating state of the connecting rod 4 is judged by observing the stroke position of the pin 7 in the groove. A push rod 16 is provided at the bottom of the inner sleeve 13. A support frame 10 is provided at the upper end of the push rod 16. The push rod 16 reciprocates axially, and successively pushes the support frame 10, the star wheel, and the connecting rod B6 to control the opening and closing of the hook claw 15. A guide head 11 is provided at the lower end of the outer sleeve 9. The guide head 11 conducts guiding when the device enters the spent tool sleeve, facilitating the positioning of the device for the spent tool sleeve. It should be noted that the end where the hook claw 15 is provided is the lower end of the device, and the end where the connecting rod B6 is provided is the upper end of the device.

[0022] The present utility model provides a lifting device for a spent tool sleeve of a fast reactor control rod. The device realizes the opening and closing of the hook claw 15 through the axial movement of the push rod 16, the rotation of the star wheel, and the connecting pipe B, thereby realizing the purpose of separately grasping and transporting the unlocked spent tool sleeve of the control rod. The device meets the on-site requirements of sodium-cooled fast reactors, fills the equipment gap, and makes up for the domestic blank in the transfer process of split control rod assemblies.

[0023] In some embodiments, the connecting rod B6 is connected to the connecting rod 4A through a connecting section. The connecting section and the connecting rod 4A are used to extend the operating distance of the device, enabling the operator to operate underwater equipment above the pool. A lifting ring 3 is provided at the top of the connecting rod 4A. The lifting ring 3 is a U-shaped ring and is used to carry the entire device and the object to be lifted.

[0024] In some embodiments, a groove A17 is provided at the middle section of the outer sleeve 9, and a groove B18 is provided at the lower section of the connecting rod B6. The device further includes a steel ball 12. The steel ball 12 is provided at the upper section of the inner sleeve 13. The steel ball 12 switches positions between the groove A17 and the groove B18 when the connecting rod B6 reciprocates axially. The steel ball 12 is stuck in the groove A17 and the groove B18 to realize the self-locking of the device.

[0025] As Figure 4As shown, the device is stored in the support frame 1, and the support frame 1 is connected to the floor of the spent fuel storage pool through expansion bolts 2.

[0026] As Figures 1 to 4 shown, the present utility model provides a lifting device for the spent tool sleeve of a fast reactor control rod. The operation method of the device is as follows:

[0027] Step 1: The operator enters the area of the spent fuel storage pool, and connects the overhead crane in the operation building to the sling, the electronic scale, and the lifting device for the spent tool sleeve of the sodium-cooled fast reactor control rod stored in the support frame 1 in sequence.

[0028] Step 2: Operate the crane to lift the device and record the reading of the electronic scale as A Kg;

[0029] Step 3: Operate the crane to completely lift the device and transfer it above the spent tool sleeve of the control rod to be lifted.

[0030] Step 4: Align the device with the spent tool sleeve of the control rod assembly below and slowly lower it until the reading of the electronic scale shows 0 Kg, then stop lowering.

[0031] Step 5: Operate the crane to lift the device and observe the reading of the electronic scale. When the reading of the electronic scale exceeds A Kg and reaches B Kg, where B Kg is the sum of A Kg and the weight of the spent tool sleeve, it means that the spent tool sleeve has been successfully grasped. Then continue to lift the crane until the spent tool sleeve is completely removed from the storage grid;

[0032] Step 6: Transfer the spent tool sleeve to the required storage position, and operate the crane to lower the device until the reading of the electronic scale shows 0 Kg;

[0033] Step 7: Operate the crane to lift the device again and observe the reading of the electronic scale. When the reading of the electronic scale is stable at A Kg, it indicates that the lifting device has been decoupled from the spent tool sleeve;

[0034] Step 8: Operate the crane to transfer the lifting device to the support seat position, and place it back in place to complete one transfer process.

[0035] The above has made a detailed description of the embodiments of the present utility model. The present utility model is not limited to the above examples. Within the knowledge scope of those of ordinary skill in the art, various changes can be made without departing from the purpose of the present utility model.

Claims

1. A lifting device for the spent tool sleeve of a fast reactor control rod, characterized in that, The device includes a connecting rod B, an outer sleeve, an inner sleeve, a star wheel, a hook claw, a thimble and a push rod. The inner sleeve is arranged inside the lower section of the outer sleeve. The connecting rod B is arranged inside the outer sleeve. The hook claw is arranged at the lower end of the outer sleeve. The hook claw is of a three-lobe structure and is circumferentially symmetrically arranged along the axial direction. The hook claw is of an outward-turning structure, and a protruding structure is arranged at the top end of the hook claw. The lower section of the connecting rod B is arranged inside the inner sleeve. The lower end of the connecting rod B is connected to the star wheel. The connecting rod B reciprocates axially to realize the opening and closing of the hook claw. The push rod is arranged at the bottom of the inner sleeve, and the thimble is arranged at the upper end of the push rod. The push rod reciprocates axially to sequentially push the thimble, the star wheel and the connecting rod B to control the opening and closing of the hook claw.

2. The lifting device for the spent tool sleeve of the control rod of a fast reactor according to claim 1, wherein, The connecting rod B is connected to the connecting rod A through a connecting section. The connecting section and the connecting rod A are used to lengthen the operating distance of the device, so that the operator can operate the underwater equipment above the pool.

3. The lifting device for the spent tool sleeve of the control rod of a fast reactor according to claim 1, characterized in that, A groove A is arranged at the middle section of the outer sleeve, and a groove B is arranged at the lower section of the connecting rod B. The device also includes a steel ball, which is arranged at the upper section of the inner sleeve. The steel ball switches positions between the groove A and the groove B when the connecting rod B reciprocates axially, so as to realize the self-locking of the device.

4. A lifting device for a spent tool sleeve of a fast reactor control rod according to claim 1, characterized in that, A groove is arranged at the middle section of the connecting rod B, and a pin is arranged in the groove. The pin slides in the groove, and the operating state of the connecting rod B is judged by observing the stroke position of the pin in the groove.

5. A lifting device for a spent tool sleeve of a fast reactor control rod according to claim 1, characterized in that, A guiding head is arranged at the lower end of the outer sleeve. The guiding head guides the device when it enters the spent tool sleeve, and is used for the device to position the spent tool sleeve.

6. The lifting device for the spent tool sleeve of the control rod of a fast reactor according to claim 2, characterized in that, A lifting ring is arranged at the top end of the connecting rod A.

7. A lifting device for a spent tool sleeve of a fast reactor control rod according to claim 1, characterized in that, The device is stored in a support frame, and the support frame is connected to the floor of the spent fuel storage pool through expansion bolts.

8. The lifting device for the spent tool sleeve of the control rod of a fast reactor according to claim 1, characterized in that, The protruding structure of the hook claw is matched with the meshing part of the spent tool sleeve.

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