A nuclear island gate valve leakage ring rotating device

Abstract

The present invention belongs to the field of valve maintenance technology, and specifically relates to a nuclear island gate valve leakage ring rotation device. It includes a rotating bracket and a rotating handle. The rotating handle is fastened to the end of the rotating bracket. The rotating bracket is installed on the valve stem. The upper end of the screw is inserted into the rotating hole of the rotating bracket. The rotating handle is rotated, and the bottom end of the screw is inserted into the new lifting hole of the leakage ring. The rotating bracket includes four connecting rods. The ends of the four connecting rods are rotatably connected by end shaft hinges. Each end shaft hinge is connected to a telescopic mechanism. The end of the telescopic rod of the telescopic mechanism is provided with a roller supporting the valve stem. The rotating shaft of the roller is parallel to the valve stem. The middle part of each connecting rod is connected to a rod that can be inserted into the new lifting hole of the leakage ring. The two opposite telescopic mechanisms are connected to the rotating handle. The present invention can eliminate jamming and facilitate the removal of the leakage ring from the stuffing box.

Description

Technical Field

[0001] The invention belongs to the technical field of valve maintenance, and in particular relates to a leakage guide ring rotating device for a nuclear island gate valve. Background Art

[0002] Nuclear island gate valves are used for primary system status control in power plants. After long-term operation, the system medium will become radioactive. A packing leakage ring is usually designed at the gate valve stem seal to collect the leaked medium at the stem packing and drain it into a sealed container or system, thereby avoiding the leakage of the medium caused by the failure of the stem packing seal and polluting the environment.

[0003] During gate valve maintenance, the packing leak ring must be removed and the packing above and below replaced. Due to corrosion during operation and foreign matter from packing wear becoming lodged between the leak ring and the inner wall of the stuffing box, the traditional method of removing the leak ring using tools becomes ineffective, making it impossible to replace the packing below it. This results in long-term defective system operation, and the packing below the leak ring is damaged and deteriorates, leading to a loss of control over the primary circuit of the unit.

[0004] At present, the solution for the situation that the leakage ring is stuck and cannot be removed at home and abroad is to use the electric spark machining process to cut the packing leakage ring online, and design a special tool to remove the cut packing leakage ring. This method not only takes a long time to cut, but also occupies a large space for the electric spark cooling system. At the same time, it also requires at least 5 operators to cooperate with the maintenance work, which is costly and inefficient.

[0005] To improve the efficiency of leak-trap ring removal and avoid complete damage, allowing for reuse, a method was proposed to drill and tap holes in the upper end face of the leak-trap ring. A screw was then inserted to pull the ring upward and remove it. Because the leak-trap ring is prone to partial jamming between the ring and the inner wall of the stuffing box, it is necessary to rotate the ring to eliminate the jam. Therefore, a device capable of rotating the ring is required. Summary of the Invention

[0006] The purpose of the present invention is to provide a nuclear island gate valve leakage ring rotating device so as to eliminate the jamming and facilitate the removal of the leakage ring from the stuffing box.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A nuclear island gate valve leakage ring rotating device includes a rotating bracket and a rotating handle. The rotating handle is fastened to the end of the rotating bracket, and the rotating bracket is installed on the valve stem. The upper end of the screw is inserted into the rotating hole of the rotating bracket. When the rotating handle is rotated, the bottom end of the screw is inserted into the new lifting hole of the leakage ring.

[0009] The rotating bracket is a split bracket.

[0010] The rotating handle is a half-handle.

[0011] The rotating handle is fastened to the end of the rotating bracket by four fastening screws.

[0012] After the bottom end of the screw is inserted into the new lifting hole of the leakage ring, tighten the locking bolt.

[0013] When working, use both hands to symmetrically rotate the rotating handle in forward and reverse directions to drive the leakage ring to rotate and try to eliminate the jam.

[0014] The rotating bracket includes four connecting rods, and the ends of the four connecting rods are rotatably connected through end shaft hinges. Each end shaft hinge is connected to a telescopic mechanism. The end of the telescopic rod of the telescopic mechanism is provided with a roller supporting the valve stem. The rotating shaft of the roller is parallel to the valve stem. The middle part of each connecting rod is connected to a rod that can be inserted into the new pulling hole of the leakage ring, and the two opposite telescopic mechanisms are connected to a rotating handle.

[0015] The end shaft hinge adopts a detachable connection method so that the four connecting rods can be connected around the valve stem to form a bracket.

[0016] The telescopic mechanism is a screw and sleeve telescopic mechanism driven by a pneumatic cylinder, a hydraulic cylinder, an electric cylinder or manually.

[0017] By rotating the handle, the rod inserted into the new lifting hole drives the leakage guide ring to rotate, and by controlling the extension and contraction of different telescopic mechanisms, thrust or pulling force is provided to the leakage guide ring in different radial directions, thereby controlling different parts of the leakage guide ring to approach or move away from the valve stem, thereby eliminating the jam. When in use, after elastically adjusting the extension and contraction amount of a telescopic mechanism, the leakage guide ring is rotated or pulled to see whether the jam is eliminated. If not, adjust the extension and contraction of the next one or two telescopic mechanisms until the jam is eliminated.

[0018] The beneficial effects achieved by the present invention are:

[0019] The present invention consists of a rotating bracket, a rotating handle, and a locking bolt. During operation, the half-rotating bracket is installed on the valve stem. The bracket position is adjusted appropriately so that the lower end of the extended drill bit is placed in the leakage guide ring lifting hole. The bolt is tightened. Using appropriate operating force, the rotating handle is rotated symmetrically in both forward and reverse directions to drive the leakage guide ring to rotate, attempting to eliminate any obstructions and laying the foundation for smooth leakage guide ring lifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the installation of a nuclear island gate valve leakage ring rotating device;

[0021] Figure 2 This is a schematic diagram of the structure of a nuclear island gate valve leakage ring rotating device;

[0022] Figure 3This is a top view schematic diagram of a nuclear island gate valve leakage ring rotating device in use;

[0023] Figure 4 Schematic diagram of the leakage ring structure;

[0024] In the figure: 1. Valve yoke; 2. Leakage ring; 201. Drainage hole; 202. Original lifting hole; 203. New lifting hole; 3. Lower packing; 4. Valve stem; 5. Stuffing box; 7. Rotating device; 701. Rotating bracket; 702. Locking bolt; 703. Rotating handle; 704. Screw; 705. Fastening screw; 61. Connecting rod; 62. End shaft hinge; 63. Telescopic mechanism; 64. Roller; 65. Rod. DETAILED DESCRIPTION

[0025] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1-4 As shown, a nuclear island gate valve leakage ring rotating device 7 is mainly composed of a split rotating bracket 701 and a rotating handle 703. When assembling, first fasten the half rotating handle 703 to the end of the split rotating bracket 701 through four fastening screws 705, then install the split rotating bracket 701 at a suitable position of the valve stem 4, install the locking bolt 702, and then insert a certain number (4 new holes) of screws 704 into the rotating holes of the rotating bracket 701, rotate the rotating handle 703, and wait for the screws to be screwed. After the bottom end of the rod 704 is inserted into the new lifting hole 203 of the leakage guide ring 2, the locking bolt 702 is tightened; when working, the rotating handle 703 is rotated symmetrically in forward and reverse directions with both hands to drive the leakage guide ring 2 to rotate, trying to eliminate the jamming, laying the foundation for the smooth lifting of the leakage guide ring 2. The device can also be used to deal with the breakage of the drill bit or tap during the drilling or tapping process. If the tap or drill bit breaks during operation, the length remaining in the lifting hole of the leakage guide ring is higher than the allowable distance of the upper surface of the leakage guide ring, and the device can be used to cut off the protruding part.

[0027] When in use, install and use the rotating device 7, insert the four screws 704 into the rotating hole of the rotating bracket 701, insert the bottom end into the new pulling hole 203 of the leakage ring 2, use appropriate operating force to symmetrically rotate the rotating handle 703 in forward and reverse directions to drive the leakage ring 2 to rotate, try to eliminate the jam, and disassemble the rotating device 7.

[0028] The difference from the above embodiment is that the rotating bracket 701 of this embodiment includes four connecting rods 61, and the ends of the four connecting rods 61 are rotatably connected by end shaft hinges 62. The end shaft hinges 62 adopt a detachable connection method so that the four connecting rods 61 are connected end to end around the valve stem 4 to form a bracket. Each end shaft hinge 62 is connected to a telescopic mechanism 63. The telescopic mechanism 63 can be a device that can be telescopic such as a pneumatic cylinder, a hydraulic cylinder, an electric cylinder, or a manually driven telescopic screw sleeve telescopic mechanism 63. The end of the telescopic rod of the telescopic mechanism 63 is provided with a support for the valve stem 4. The roller 64 has a rotating shaft parallel to the valve stem 4. The middle of each connecting rod 61 is connected to a rod 65 that can be inserted into the new lifting hole 203 of the leakage guide ring 2. The two opposite telescopic mechanisms 63 are connected with a rotating handle 703. By rotating the handle 703, the rod 65 inserted into the new lifting hole 203 drives the leakage guide ring 2 to rotate. By controlling the expansion and contraction of different telescopic mechanisms 63, thrust or pulling force can be provided to the leakage guide ring 2 in different radial directions, thereby controlling different parts of the leakage guide ring 2 to approach or move away from the valve stem 4, thereby eliminating jamming. When in use, the expansion and contraction amount of a telescopic mechanism 63 can be flexibly adjusted, and then the leakage guide ring 2 is rotated or pulled to see if the jam is eliminated. If not, the expansion and contraction of the next one or two telescopic mechanisms 63 can be adjusted until the jam is eliminated.

Claims

1. A nuclear island gate valve leakage ring rotating device, characterized by: The invention comprises a rotating bracket and a rotating handle, wherein the rotating handle is fastened to the end of the rotating bracket, the rotating bracket is installed on the valve stem, the upper end of the screw is inserted into the rotating hole of the rotating bracket, and the rotating handle is rotated, so that the bottom end of the screw is inserted into the new lifting hole of the leakage guide ring. The rotating bracket comprises four connecting rods, the ends of the four connecting rods are rotatably connected by end shaft hinges, each end shaft hinge is connected to a telescopic mechanism, the end of the telescopic rod of the telescopic mechanism is provided with a roller supporting the valve stem, the rotating shaft of the roller is parallel to the valve stem, the middle part of each connecting rod is connected to a rod capable of being inserted into the new lifting hole of the leakage guide ring, and the rotating handle is connected to the two opposite telescopic mechanisms. By rotating the handle, the rod inserted into the new lifting hole drives the leakage guide ring to rotate, and by controlling the extension and contraction of different telescopic mechanisms, thrust or pulling force is provided to the leakage guide ring in different radial directions, thereby controlling different parts of the leakage guide ring to approach or move away from the valve stem, thereby eliminating jamming. When in use, after elastically adjusting the extension and contraction of one telescopic mechanism, the leakage guide ring is rotated or lifted to see whether the jamming is eliminated. If not, the extension and contraction of the next one or two telescopic mechanisms are adjusted until the jamming is eliminated.

2. The nuclear island gate valve leakage guide ring rotating device according to claim 1 is characterized in that: The rotating bracket is a split bracket.

3. The nuclear island gate valve leakage guide ring rotating device according to claim 1 is characterized in that: The rotating handle is a half-handle.

4. The nuclear island gate valve leakage guide ring rotating device according to claim 1 is characterized in that: The rotating handle is fastened to the end of the rotating bracket by four fastening screws.

5. The nuclear island gate valve leakage guide ring rotating device according to claim 1 is characterized in that: After the bottom end of the screw is inserted into the new lifting hole of the leakage ring, tighten the locking bolt.

6. The nuclear island gate valve leakage guide ring rotating device according to claim 1 is characterized in that: When working, use both hands to symmetrically rotate the rotating handle in forward and reverse directions to drive the leakage ring to rotate and try to eliminate the jam.

7. The nuclear island gate valve leakage guide ring rotating device according to claim 1 is characterized in that: The end shaft hinge adopts a detachable connection method.

8. The nuclear island gate valve leakage guide ring rotating device according to claim 1 is characterized in that: The telescopic mechanism is a screw and sleeve telescopic mechanism driven by a pneumatic cylinder, a hydraulic cylinder, an electric cylinder or manually.

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