Gripper for spent control rod assembly of sodium-cooled fast reactor

Abstract

The utility model relates to the technical field of sodium-cooled fast reactor spent control rod hoisting and transferring, in particular to a sodium-cooled fast reactor spent control rod assembly gripping apparatus, which comprises a connecting rod, an outer sleeve, an inner sleeve, a star wheel, an ejector pin, a push rod and a gripping head, an inner sleeve is arranged in the lower end of the outer sleeve, and an ejector pin is arranged at the lower end of the inner sleeve; the lower section of the connecting rod is arranged in the inner sleeve, the middle section of the connecting rod is arranged in the outer sleeve, and the connecting rod reciprocates in the outer sleeve to realize opening and closing of the gripper; the lower end of the connecting rod is connected with the star wheel through a pin; grippers are arranged at the lower end of the outer sleeve. The device is connected with a lifting hook of a crane through a lifting ring, and by means of operation of the crane and lifting of the lifting hook, transfer of a simulation control rod assembly moving body and tool sleeve combined body and a simulation control rod assembly outer sleeve and sleeve gripper combined body in a spent fuel storage pool hall is completed. And the vacancy of lack of the sodium-cooled fast reactor spent control rod assembly transfer gripping apparatus in the prior art is filled.

Description

Technical Field

[0001] The utility model relates to the technical field of hoisting and transporting spent control rods of a sodium-cooled fast reactor, in particular to a gripper for a spent control rod assembly of a sodium-cooled fast reactor. Background Art

[0002] The spent control rod assembly of a sodium-cooled demonstration fast reactor is a split structure consisting of a moving body and an outer sleeve. During overhaul of a sodium-cooled fast reactor, the spent control rod assembly must be disassembled and transported. Existing tools for fast reactors cannot meet the requirements for transporting the spent control rod assembly moving body, tool sleeve assembly, and spent control rod assembly outer sleeve, sleeve gripper assembly. To ensure smooth transport of the control rod assembly, a spent control rod assembly gripper for sodium-cooled fast reactors was designed to facilitate the transport of the moving body, tool sleeve assembly, and spent control rod assembly outer sleeve, sleeve gripper assembly. Utility Model Content

[0003] The utility model provides a sodium-cooled fast reactor spent control rod assembly gripper, which is used to solve the problem in the prior art of lacking a transport tool for the spent control rod assembly moving body and tool sleeve combination, and the spent control rod assembly outer sleeve and sleeve gripper combination.

[0004] The technical solution of this utility model:

[0005] The utility model proposes a gripper for a spent control rod assembly of a sodium-cooled fast reactor, which comprises a connecting rod, an outer sleeve, an inner sleeve, a star wheel, an ejector pin, a push rod and a claw; an inner sleeve is provided inside the lower end of the outer sleeve, a claw is provided at the lower end of the outer sleeve, the top end of the claw is an inclined surface, so as to prevent the claw from unlocking the moving body and the tool sleeve assembly when the moving body is grabbed; an ejector pin is provided at the lower end of the inner sleeve, and a push rod is provided at the lower end of the ejector pin; the lower section of the connecting rod is provided inside the inner sleeve, the middle section of the connecting rod is provided inside the outer sleeve, the connecting rod reciprocates in the outer sleeve to realize the opening and closing of the claw; the lower end of the connecting rod is connected to the star wheel by a pin.

[0006] In some embodiments, a lifting ring B is provided at the upper end of the connecting rod, and a lifting ring A is provided at the upper end of the lifting ring B. The lifting ring A and the lifting ring B are connected by a pin, and the pin is used to connect and disconnect the lifting ring A and the gripper.

[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 gripper is also provided with a steel ball. When the connecting rod reciprocates, the steel ball switches positions between groove A and groove B to achieve self-locking of the gripper.

[0008] In some embodiments, the gripper is a three-petal gripper head, which is rotationally symmetrical about the axis. The gripper head grabs the annular groove of the moving body operating head of the spent control rod assembly and the annular groove of the sleeve gripper operating head of the spent control rod assembly. The outer diameter of the gripper is 96 mm, and the outer diameter of the gripper matches the annular groove of the moving body operating head.

[0009] In some embodiments, a spring is provided between the push rod and the ejector pin. Under the action of the spring, the ejector pin applies a rotational torque to the star wheel and pushes the star wheel to rotate periodically; the rotation of the star wheel pushes the connecting rod, thereby controlling the opening and closing of the gripper.

[0010] In some embodiments, a pin hole is provided at the tail of the latch, and the pin hole is used to install a quick-pull latch to prevent the latch from falling off.

[0011] In some embodiments, the gripper is stored in a storage rack, the storage rack and the gripper are connected by bolts, and the storage rack is connected to the ground of the spent fuel storage pool by expansion bolts.

[0012] Beneficial effects of the utility model:

[0013] The utility model provides a gripper for sodium-cooled fast reactor spent control rod assemblies. This gripper is used to transport spent control rod assemblies within a new fuel building for a sodium-cooled fast reactor. The gripper is connected to a crane hook via a lifting ring. By utilizing the operation of the crane and the raising and lowering of the hook, the spent control rod assembly's moving body and tool sleeve assembly, as well as the spent control rod assembly's outer sleeve and sleeve gripper assembly, are transported within the spent fuel storage pool hall. This fills the gap in the prior art for grippers for transporting spent control rod assemblies for sodium-cooled fast reactors. The gripper has a small-headed claw with an inclined top, preventing the moving body and tool sleeve assembly of the spent control rod assembly from being unlocked during the gripping process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the gripper connecting rod of a new type of sodium-cooled fast reactor spent control rod assembly gripper proposed in this utility model in the extended state;

[0015] Figure 2 This is a schematic structural diagram of a gripper of a sodium-cooled fast reactor spent control rod assembly gripper proposed by the present invention, showing which component is in a retracted state;

[0016] Figure 3 This is a top view of a gripper for a spent control rod assembly of a sodium-cooled fast reactor proposed in the present invention;

[0017] Figure 4 This is a schematic diagram of the storage rack structure of a sodium-cooled fast reactor spent control rod assembly gripper proposed in the present invention;

[0018] Description of the accompanying drawings: 1. Lifting ring A; 2. Lifting ring B; 3. Connecting rod; 4. Outer sleeve; 5. Inner sleeve; 6. Steel ball; 7. Star wheel; 8. Ejector pin; 9. Push rod; 10. Claw; 11. Latch; 12. Storage rack; 13. Groove A; 14. Groove B. DETAILED DESCRIPTION

[0019] A gripper for a spent control rod assembly of a sodium-cooled fast reactor according to the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0020] like Figures 1 to 4 As shown, the utility model proposes a gripper for a spent control rod assembly of a sodium-cooled fast reactor, which includes a connecting rod 3, an outer sleeve 4, an inner sleeve 5, a star wheel 7, an ejector pin 8, a push rod 9 and a gripper 10; the inner sleeve 5 is provided inside the lower end of the outer sleeve 4, the ejector pin 8 is provided at the lower end of the inner sleeve 5, and the push rod 9 is provided at the lower end of the ejector pin 8; the lower section of the connecting rod 3 is provided inside the inner sleeve 5, the middle section of the connecting rod 3 is provided inside the outer sleeve 4, and the connecting rod 3 reciprocates in the outer sleeve 4 to realize the opening and closing of the gripper 10; the lower end of the connecting rod 3 is connected to the star wheel 7 by a pin, the upper end of the connecting rod 3 is provided with a lifting ring B2, the upper end of the lifting ring B2 is provided with a lifting ring A1, the lifting ring A1 and the lifting ring B2 are connected by a latch 11, and the latch 11 is used to connect and disconnect the lifting ring A1 and the gripper. A pin hole is provided at the tail end of the pin 11, which is used to install the quick-pull pin 11 to prevent the pin 11 from falling off; a claw 10 is provided at the lower end of the outer sleeve 4, which is used to grab the spent control rod assembly moving body and tool sleeve combination, and the spent control rod assembly outer sleeve 4 and sleeve gripper combination.

[0021] In some embodiments, the gripper 10 is a three-lobed gripper, rotationally symmetrical about an axis. The gripper grips the annular grooves of the moving body operating head of the spent control rod assembly and the annular grooves of the sleeve gripper operating head of the spent control rod assembly. The gripper 10 has an outer diameter of 96 mm, and its top is beveled. This prevents the moving body from being unlocked from the tool sleeve assembly when the gripper 10 grips the moving body. The end of the gripper with the gripper 10 is the lower end, and the end with the connecting rod 3 is the upper end.

[0022] In some embodiments, a groove A13 is provided at the middle position of the outer sleeve 4, a groove B14 is provided at the lower position of the connecting rod 3, and the gripper is also provided with a steel ball 6. When the connecting rod 3 reciprocates, the steel ball 6 switches positions between the groove A13 and the groove B14 to achieve self-locking of the gripper.

[0023] In some embodiments, a spring is provided between the push rod 9 and the ejector pin 8. Under the action of the spring, the ejector pin 8 applies a rotational torque to the star wheel 7 and pushes the star wheel 7 to rotate periodically around the pin connected to the connecting rod 3; the star wheel 7 rotates and pushes the connecting rod 3, thereby controlling the opening and closing of the gripper 10.

[0024] In some embodiments, the gripper is stored in a storage rack 12 , the storage rack 12 and the gripper are connected by bolts, and the storage rack 12 is connected to the ground of the spent fuel storage pool by expansion bolts.

[0025] like Figures 1 to 4As shown, the utility model proposes a gripper for a spent control rod assembly of a sodium-cooled fast reactor. The specific method of using the gripper to transport a moving body of a spent control rod assembly and a tool sleeve assembly is as follows:

[0026] Step 1: At the storage rack 12, connect the lifting ring of the sodium-cooled fast reactor spent control rod assembly gripper to the crane hook in the storage pool hall.

[0027] Step 2: Operate the crane to move the sodium-cooled fast reactor spent control rod assembly gripper to a position above the spent control rod assembly moving body and tool sleeve assembly.

[0028] Step 3: Operate the crane to align the sodium-cooled fast reactor spent control rod assembly gripper with the head of the spent control rod assembly moving body and tool sleeve assembly, and operate the crane to lower the gripper so that the gripper claw 10 of the gripper and the surfaces of the spent control rod assembly moving body and tool sleeve assembly are effectively fitted.

[0029] Step 4: Continue to lower the crane until the hook can no longer be lowered. Then operate the crane to lift the sodium-cooled fast reactor spent control rod assembly gripper 1000 mm. At this time, the gripper 10 closes and locks the annular groove of the operating head of the spent control rod assembly's moving body. The spent control rod assembly moving body and tool sleeve assembly are lifted along with the crane.

[0030] Step 5: Operate the crane to completely remove the spent control rod assembly moving body and the tool sleeve assembly from the grid and transfer them to an adjacent control panel storage location.

[0031] Step 6: Lower the crane until the hook stops descending. At this time, operate the crane to lift 1000mm, and the claws 10 of the sodium-cooled fast reactor spent control rod assembly gripper open, completing the transfer of the spent control rod assembly moving body and the tool sleeve assembly.

[0032] Step 7: Lift the sodium-cooled fast reactor spent control rod assembly gripper to the storage rack 12.

[0033] 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 gripper for a sodium-cooled fast reactor spent control rod assembly, characterized in that: The gripper includes a connecting rod, an outer sleeve, an inner sleeve, a star wheel, a thimble, a push rod and a claw; the inner sleeve is provided inside the lower end of the outer sleeve, and a claw is provided at the lower end of the outer sleeve, and the top of the claw is an inclined surface to prevent the claw from unlocking the moving body and the tool sleeve combination when grabbing the moving body; the lower end of the inner sleeve is provided with a thimble, and the lower end of the thimble is provided with a push rod; the lower section of the connecting rod is provided inside the inner sleeve, and the middle section of the connecting rod is provided inside the outer sleeve, and the connecting rod reciprocates in the outer sleeve to realize the opening and closing of the claw; the lower end of the connecting rod is connected to the star wheel by a pin.

2. The sodium-cooled fast reactor spent control rod assembly gripper according to claim 1, characterized in that: A lifting ring B is provided at the upper end of the connecting rod, and a lifting ring A is provided at the upper end of the lifting ring B. The lifting ring A and the lifting ring B are connected by a latch, and the latch is used to connect and disconnect the lifting ring A and the gripper.

3. The sodium-cooled fast reactor spent control rod assembly gripper according to claim 1, characterized in that: The outer sleeve has a groove A in the middle, the connecting rod has a groove B in the lower part, and the gripper is also provided with a steel ball. When the connecting rod reciprocates, the steel ball switches positions between the groove A and the groove B, thereby realizing self-locking of the gripper.

4. The sodium-cooled fast reactor spent control rod assembly gripper according to claim 1, characterized in that: The gripper is a three-petal gripper head, which is rotationally symmetrical about the axis. The gripper head grips the annular groove of the moving body operating head of the spent control rod assembly and the annular groove of the sleeve gripper operating head of the spent control rod assembly; the outer diameter of the gripper is 96 mm, which matches the annular groove of the moving body operating head.

5. The sodium-cooled fast reactor spent control rod assembly gripper according to claim 1, characterized in that: A spring is provided between the push rod and the ejector pin. Under the action of the spring, the ejector pin applies a rotational torque to the star wheel and pushes the star wheel to rotate periodically. The rotation of the star wheel pushes the connecting rod, thereby controlling the opening and closing of the gripper.

6. The sodium-cooled fast reactor spent control rod assembly gripper according to claim 2, characterized in that: The tail of the latch is provided with a pin hole, and the pin hole is used to install the quick-pull latch to prevent the latch from falling off.

7. The gripper for a sodium-cooled fast reactor spent control rod assembly according to claim 1, characterized in that: The gripper is stored in a storage rack, the storage rack and the gripper are connected by bolts, and the storage rack is connected to the ground of the spent fuel storage pool by expansion bolts.

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