Fuel assembly hanger

Abstract

The present application belongs to the technical field of mechanical design and manufacturing, and particularly relates to a fuel assembly lifting appliance. A lifting ring is connected with a supporting shaft, the lower end of the supporting shaft is provided with a connecting rod, the lower end of the connecting rod is provided with a lifting shaft, the lower end of the lifting shaft is provided with a locking nut, the lower end of the locking nut is provided with an anti-rotation device, and the lower end of the anti-rotation device is provided with a hook claw. The lifting ring is connected with the supporting shaft through a pin shaft and a split pin. The anti-rotation device comprises an index pin, a hexagon nut, a supporting plate and a positioning pin. The supporting plate is provided with the index pin. The supporting plate is connected with the positioning pin through the hexagon nut. The pin of the anti-rotation device is aligned with the S hole of the upper tube seat component and is inserted downward to the bottom at an angle of 45 degrees. The lifting ring, the connecting rod or the lifting shaft is held and rotated counterclockwise by 45 degrees, so that the pin of the anti-rotation device is automatically inserted into the corresponding hole of the hook claw, and the lifting appliance and the fuel assembly are assembled into one. The present application can bear the weight of the fuel assembly, lock the assembly to avoid falling off, fully expose the internal structure of the tube seat component for easy cleaning and observation, and cause no damage to the assembly.

Description

Technical Field

[0001] This invention belongs to the field of mechanical design and manufacturing technology, and specifically relates to a fuel assembly lifting device. Background Technology

[0002] Existing fuel assembly lifting tools or grippers are all specialized, and there are no dedicated lifting tools applicable to a certain type of fuel assembly. A search revealed grippers that are easy to operate and can fully expose the internal structure of the upper tube seat component, as seen in the patents for "mechanical self-locking fuel assembly gripper" and "new fuel assembly gripper". However, these grippers have the disadvantages of complex structure, difficult manufacturing, and easy damage. Summary of the Invention

[0003] The purpose of this invention is to provide a fuel assembly lifting device that can be installed inside the upper pipe seat component, bear the weight of the fuel assembly, lock it to prevent the assembly from falling off, fully expose the internal structure of the pipe seat component for easy cleaning and observation, and does not cause any damage to the assembly.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A fuel assembly lifting device has a lifting ring connected to a support shaft. The lower end of the support shaft is provided with a connecting rod, the lower end of the connecting rod is provided with a lifting shaft, the lower end of the lifting shaft is provided with a locking nut, the lower end of the locking nut is provided with an anti-rotation device, and the lower end of the anti-rotation device is provided with a hook.

[0006] The lifting ring is connected to the support shaft via a pin and a cotter pin.

[0007] The anti-rotation device includes an indexing pin, a hexagonal nut, a support plate, and a locating pin.

[0008] The support plate is equipped with indexing pins.

[0009] The support plate is connected to a locating pin via a hexagonal nut.

[0010] Align the anti-rotation device pin at a 45° angle with the S-hole of the upper pipe seat component and insert it downwards to the bottom. Hold the lifting ring, connecting rod or lifting shaft and rotate counterclockwise 45° so that the anti-rotation device pin automatically inserts into the corresponding hole of the hook claw, thus completing the assembly of the lifting device and fuel assembly into one unit.

[0011] Cranes and hoists are used for lifting and transporting via lifting rings.

[0012] The fuel assembly is stored in a free-standing, suspended state using a support shaft.

[0013] The beneficial effects achieved by this invention are as follows:

[0014] This invention proposes a novel fuel assembly lifting device structure that is simpler, more robust, and safer. The lifting device employs a special hook with a rotatable and lockable mechanism and a side window to engage with the stepped structure within the upper tube seat component cavity. The structure is simple and easy to manufacture; easy to operate and safe; and robust and not easily damaged. Attached Figure Description

[0015] Figure 1 This is a diagram of a fuel assembly lifting device;

[0016] Figure 2 This is a diagram showing the working state of a fuel assembly lifting device;

[0017] Figure 3 Diagram of the hook and claw structure;

[0018] Figure 4 Diagram of anti-rotation device;

[0019] In the diagram: 1-lifting ring, 2-pin, 3-cotter pin, 4-support shaft, 5-connecting rod, 6-lifting shaft, 7-locking nut, 8-anti-rotation device, 9-hook, 10-indexing pin, 11-hexagonal nut, 12-support plate, 13-positioning pin. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0021] A fuel assembly lifting device includes a lifting ring 1 connected to a support shaft 4 via a pin 2 and a cotter pin 3. A connecting rod 5 is provided at the lower end of the support shaft 4, and a lifting shaft 6 is provided at the lower end of the connecting rod 5. A locking nut 7 is provided at the lower end of the lifting shaft 6, and an anti-rotation device 8 is provided at the lower end of the locking nut 7. A hook 9 is provided at the lower end of the anti-rotation device 8. The anti-rotation device 8 includes an indexing pin 10, a hexagonal nut 11, a support plate 12, and a positioning pin 13. The indexing pin 10 is provided on the support plate 12, and the positioning pin 13 is connected to the support plate 12 via the hexagonal nut 11.

[0022] The lifting device uses a rotatable and lockable hook with a window on the side to hook onto the step inside the cavity of the upper tube seat component to achieve the purpose of the invention. Figure 1 With the lifting device in a non-working state, align the pin of the anti-rotation device 8 at a 45° angle with the S-hole of the upper pipe seat component and insert it all the way down. Hold the lifting ring 1, connecting rod 5, or lifting shaft 6 and rotate counterclockwise 45° to automatically insert the pin of the anti-rotation device into the corresponding hole of the hook pawl 9. This completes the assembly of the lifting device and the fuel assembly into one unit. Figure 2 As shown. At this time, lifting tools such as cranes and hoists can be used to lift and transfer the fuel assembly through the lifting ring 1, and the fuel assembly can be stored in a free state through the support shaft 4.

[0023] The lifting device consists of a lifting ring, a support shaft, a connecting rod, a lifting shaft, an anti-rotation device, a hook, and other connecting or structural components. The lifting ring is suitable for lifting and transporting using cranes, hoists, and other lifting tools. The support shaft can be used for the lifting and storage of the lifting device and fuel assemblies with the lifting device attached. The anti-rotation device locks the lifting device after it is inserted into the fuel assembly, preventing the lifting device from coming out of the fuel assembly during lifting. The hook is used to extend into and hook into the upper tube seat of the fuel assembly, so that the fuel assembly can be securely suspended on the lifting device.

Claims

1. A fuel assembly lifting device, characterized in that: The lifting ring is connected to the support shaft. A connecting rod is provided at the lower end of the support shaft. A lifting shaft is provided at the lower end of the connecting rod. A locking nut is provided at the lower end of the lifting shaft. An anti-rotation device is provided at the lower end of the locking nut. A hook is provided at the lower end of the anti-rotation device.

2. The fuel assembly lifting device according to claim 1, characterized in that: The lifting ring is connected to the support shaft via a pin and a cotter pin.

3. The fuel assembly lifting device according to claim 1, characterized in that: The anti-rotation device includes an indexing pin, a hexagonal nut, a support plate, and a locating pin.

4. The fuel assembly lifting device according to claim 3, characterized in that: The support plate is equipped with indexing pins.

5. The fuel assembly lifting device according to claim 3, characterized in that: The support plate is connected to a locating pin via a hexagonal nut.

6. The fuel assembly lifting device according to claim 1, characterized in that: Align the anti-rotation device pin at a 45° angle with the S-hole of the upper pipe seat component and insert it downwards to the bottom. Hold the lifting ring, connecting rod or lifting shaft and rotate counterclockwise 45° so that the anti-rotation device pin automatically inserts into the corresponding hole of the hook claw, thus completing the assembly of the lifting device and fuel assembly into one unit.

7. The fuel assembly lifting device according to claim 6, characterized in that: Cranes and hoists are used for lifting and transporting via lifting rings.

8. The fuel assembly lifting device according to claim 1, characterized in that: The fuel assembly is stored in a free-standing, suspended state using a support shaft.

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