A nuclear island gate valve leakage ring lifting device

Abstract

The application belongs to the technical field of valve maintenance, and particularly relates to a lifting device for a leakage ring of a nuclear island gate valve. The upper end of a supporting screw rod is arranged on a valve yoke, the lower end of the supporting screw rod is arranged on a drawing support, the drawing support is arranged on a valve rod, a half type lifting nut is spliced and arranged at a threaded sleeve at the bottom end of the drawing support and is connected through a locking screw, a half type lifting sleeve is hung at the lower end of the lifting nut, the lower end of a lifting screw is screwed into original lifting holes and new lifting holes of the leakage ring, the height of the lifting sleeve is adjusted through rotation, the upper end of the lifting screw is arranged in a threaded hole of the lifting sleeve and is fixed through a nut, an operating handle and a rotation preventing handle are respectively arranged in operating holes around the lifting nut and the lifting sleeve, and the drawing support is fixed through connection between original bolt holes of the valve and the supporting screw rod. The application can efficiently complete dismounting and picking of the leakage ring and ensure that the function of the leakage ring is intact under the premise of fully considering limited operation space, and the leakage ring can be repeatedly used.

Description

Technical Field

[0001] The invention belongs to the technical field of valve maintenance, and in particular relates to a leakage guide ring lifting 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 original method of removing the leak ring using specialized 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 becomes damaged and deteriorates, leading to a loss of control over the primary circuit of the unit.

[0004] Currently, the solution for leak rings stuck and unable to be removed is to use EDM to cut the packing leak rings online and design a special tool to remove the cut packing leak rings. This method not only takes a long time to cut, but also takes up a lot of space in the EDM cooling system. It also requires at least five operators to coordinate the maintenance work, which is costly and inefficient. In order to improve the efficiency of leak ring removal and avoid complete damage to the leak rings, so that the removed leak rings can be reused, a new tool is needed to quickly and non-destructively remove the leak rings. Summary of the Invention

[0005] The purpose of the present invention is to provide a nuclear island gate valve leakage ring lifting device, in order to non-destructively remove the nuclear island gate valve leakage ring online, under the premise of fully considering the limited operating space, efficiently complete the leakage ring removal while ensuring its intact function and reusability.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A nuclear island gate valve leakage ring lifting device includes a support screw, a pulling bracket, a lifting nut, an operating handle, a lifting sleeve, an anti-rotation handle, and a lifting screw; the upper end of the support screw is placed on the valve yoke, the lower end of the support screw is placed on the pulling bracket, the pulling bracket is installed on the valve stem, the half-type lifting nut is spliced ​​and installed at the threaded sleeve at the bottom end of the pulling bracket and is connected by a set screw, the half-type lifting sleeve is hung on the lower end of the lifting nut, the lower end of the lifting screw is screwed into the original lifting hole and the new lifting hole of the leakage ring, the height of the lifting sleeve is adjusted by rotation, the upper end of the lifting screw is placed in the screw hole of the lifting sleeve and is tightened and fixed with a nut, the operating handle and the anti-rotation handle are respectively placed in the lifting nut and the operating holes around the lifting sleeve, and the pulling bracket is fixed by connecting it to the original bolt hole of the valve with the support screw.

[0008] The upper end of the support screw is placed in the threaded hole on the valve yoke and locked with a nut; the lower end of the support screw is placed in the slotted hole on the pulling bracket and locked with a nut.

[0009] The set screw connects the two half-type pull-out brackets.

[0010] The lifting loop is hung on the lower end of the lifting nut and connected by a set screw.

[0011] An L-shaped concave edge is set at the lower end of the lifting nut, which is matched and hung with a 7-shaped convex edge set at the upper end of the lifting loop. When the lifting nut rotates and moves upward, the lifting loop does not rotate with it and moves upward in a straight line, ensuring that the lifting screw only bears the pulling force in the vertical direction.

[0012] When working, turn the operating handle and use your hand to fix the handle to prevent it from turning. The lifting nut drives the lifting sleeve to move upward, drives the pulling screw to move upward, and then drives the leakage ring to move upward until it is lifted and taken out to the appropriate position.

[0013] Before using the lifting device, drill a new lifting hole on the leak guide ring, and then use the lifting device. If the leak guide ring is slightly stuck, it can be pulled out in this step. If it cannot be removed, continue to the next step to disassemble the lifting device.

[0014] If it cannot be removed: the lifting screw is connected to the bracket, and the bracket includes four connecting rods. The ends of the four connecting rods are rotatably connected by end shaft hinges. The end shaft hinges are detachably connected so that the four connecting rods are connected to form a bracket around the valve stem. 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 perpendicular to the valve stem, so that the roller can roll up and down along the valve stem. The middle part of each connecting rod is connected to the upper end of the lifting screw; the bracket also includes a lifting ring for connecting to a half-type lifting sleeve. The lifting ring is split and includes two semicircular ring bodies. The two semicircular ring bodies are connected to a circular lifting ring by bolts. A radial hole is provided on the lifting ring. The cylinder body of the telescopic mechanism is slidably set in the radial hole, thereby lifting the lifting screw upward by pulling the lifting ring.

[0015] When in use, after flexibly adjusting the extension and contraction amount of one telescopic mechanism, rotate or pull the leakage guide ring to see whether the jam is eliminated. If not, adjust the extension and contraction amount of the next one or two telescopic mechanisms until the jam is eliminated. The jam can also be eliminated by rotating the lifting ring so that the lifting screw drives the leakage guide ring to rotate. When rotating, all the telescopic mechanisms are contracted, and the roller is separated from the valve stem, so that the bracket can rotate relative to the valve stem.

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

[0018] The present invention consists of a pulling bracket, a support screw, a pulling screw, a lifting nut, a lifting loop, etc. Its function is to lift the leak guide ring to the appropriate position and then replace the lower layer of packing of the leak guide ring. During operation, the support screw is fixed to the threaded hole at the top of the valve with a bolt, and the half-type pulling bracket (including the threaded sleeve) holds the valve stem tightly. After the lower end of the pulling screw is tightened to the lifting hole of the leak guide ring, the half-type lifting nut is placed on the lower end of the threaded sleeve of the pulling bracket. The lifting loop and the lifting nut are hooked and assembled. When the lifting nut rotates, the lifting loop and the pulling screw only bear vertical tension, and do not bear torque and shear force. The upper end of the pulling screw passes through the threaded hole at the lower end of the lifting loop and is locked with a nut. Slowly rotate the lifting nut to drive the lifting screw to lift synchronously, and lift and remove the leak guide ring.

[0019] The device can be used to remove the leak ring. The removed leak ring is intact and functional, and can continue to be used after replacing the packing. It is a breakthrough in the online disassembly tooling of electric gate valves. It improves work efficiency while reducing time and labor costs, and also reduces the radiation dose of workers in high-radiation environments and the collective radiation dose. The overall disassembly and assembly of the device is convenient, and the operator only needs two wrenches on site to complete the disassembly and assembly of the tools, reducing the safety operation risks during use. The device is easy to carry and transport. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 2 This is a structural diagram of a nuclear island gate valve leakage ring lifting device;

[0022] Figure 3 This is a top view schematic diagram of a nuclear island gate valve leakage ring lifting 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; 12. Lifting device; 1201. Support screw; 1202. Pulling bracket; 1203. Lifting nut; 1204. Operating handle; 1205. Lifting loop; 1206. Anti-rotation handle; 1207. Lifting screw; 61. Connecting rod; 62. End shaft hinge; 63. Telescopic mechanism; 64. Roller; 65. Lifting ring; 651. Radial hole. DETAILED DESCRIPTION

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

[0026] like Figure 1-4As shown, a nuclear island gate valve leakage ring lifting device 12 is mainly used to lift and remove the leakage ring 2. During assembly, first measure and confirm the appropriate position of the pulling bracket 1202 according to the actual situation on site, place the upper end of the support screw 1201 in the threaded hole on the valve yoke 1 and lock it with a nut, place the lower end of the support screw 1201 in the straight hole of the pulling bracket 1202 and lock it with a nut, install the pulling bracket 1202 on the valve stem 4, tighten the screws to reliably connect the two half-type pulling brackets 1202, and tighten the half-type lifting nuts 1203. The splicing is installed at the threaded sleeve at the bottom end of the pulling bracket 1202, and is reliably connected by a set screw. The half-type lifting loop 1205 is hung on the lower end of the lifting nut 1203 and is reliably connected by a set screw. The lower end of the lifting screw 1207 (2 or 4) is screwed into the original lifting hole 202 and the new lifting hole 203 of the leakage ring 2, and the height of the lifting loop 1205 is adjusted by rotation. The upper end of the lifting screw 1207 is placed in the screw hole of the lifting loop 1205 and is tightened with a nut. The operating handle 1204 and the anti-rotation handle 1 are 206 are respectively placed in the operating holes around the lifting nut 1203 and the lifting loop 1205 for easy operation, and the pulling bracket 1202 is fixed by connecting the original bolt hole of the valve with the support screw 1201. The lifting nut 1203 and the lifting loop 1205 adopt an "L"-shaped concave edge at the lower end of the lifting nut 1203 and a "7"-shaped convex edge at the upper end of the lifting loop 1205 to match and hang, so that when the lifting nut 1203 rotates and moves upward, the lifting loop 1205 does not rotate with it and moves upward in a straight line, ensuring that the pulling screw 1202 is fixed. 207 only bears the pulling force in the vertical direction; when working, rotate the operating handle 1204 and use your hand to fix the handle 1206 to prevent it from rotating. The lifting nut 1203 drives the lifting sleeve 1205 to move upward, drives the lifting screw 1207 to move upward, and then drives the leakage ring 2 to move upward until it is lifted and taken out to the appropriate position. The setting of the handle further ensures that the lifting sleeve 1205 does not rotate with the lifting nut 1203. The lifting and taking out device has a simple structure and is easy to operate. It can directly take out the valve leakage ring as a whole, thereby improving the replacement efficiency of the seal.

[0027] Before using the lifting device, first drill a new lifting hole 203 on the leakage guide ring 2, then use the lifting device 12, place the upper ends of the two lifting screws 1207 in the screw holes of the lifting loop 1205, and screw the lower ends into the original lifting holes 202 of the leakage guide ring 2. Use appropriate force to operate the handle 1204 and use your hand to fix the handle 1206 to prevent rotation, drive the lifting screws 1207 to lift synchronously. If the leakage guide ring 2 is slightly stuck, it can be lifted and removed in this step. If it cannot be removed, continue to the next step and disassemble the lifting device 12.

[0028] Different from the above embodiments, the lifting screw 1207 of the present embodiment is connected to the bracket, the bracket comprises four connecting rods 61, the ends of the four connecting rods 61 are rotationally connected through end shaft hinges 62, the end shaft hinges 62 are detachably connected, so that the four connecting rods 61 are connected in series around the valve stem 4 to form the bracket, each end shaft hinge 62 is connected with an extension mechanism 63, the extension mechanism 63 can be a pneumatic cylinder, a hydraulic cylinder, an electric cylinder or other extendable devices, or can be a manually driven telescopic screw sleeve extension mechanism 63, the extension rod end of the extension mechanism 63 is provided with a roller 64 supporting the valve stem 4, the rotation axis of the roller 64 is perpendicular to the valve stem 4, so that the roller 64 can roll along the up-down direction of the valve stem 4, and the middle of each connecting rod 61 is connected with the upper end of the lifting screw 1207. It also comprises a lifting ring 65 for connecting with the half-type lifting sleeve 1205, the lifting ring 65 is also split type, comprising two semicircular ring bodies, the two semicircular ring bodies are connected into a circular lifting ring 65 through bolts, the lifting ring 65 is provided with a radial hole 651, and the cylinder body of the extension mechanism 63 is slidably arranged in the radial hole 651, so that the lifting screw 1207 can be lifted upward by lifting the lifting ring 65.

[0029] Since the partial jamming between the leakage ring 2 and the inner wall of the stuffing box 5 is prone to occur, the leakage ring 2 needs to be rotated at this time to eliminate the jamming. By controlling the extension of different extension mechanisms 63, the extension mechanisms 63 can provide thrust or pull force to the leakage ring 2 in different radial directions, so as to control different parts of the leakage ring 2 to approach or move away from the valve stem 4, thereby eliminating the jamming. In use, the extension amount of one extension mechanism 63 can be adjusted elastically, and then the leakage ring 2 is rotated or lifted to see if the jamming is eliminated, if not, the extension amount of the next or two extension mechanisms 63 can be adjusted until the jamming is eliminated. The jamming can also be eliminated by rotating the lifting ring 65 to make the lifting screw 1207 drive the leakage ring 2 to rotate, when rotating, all the extension mechanisms 63 can be retracted to make the rollers 64 away from the valve stem 4, so as to facilitate the rotation of the bracket relative to the valve stem 4.

Claims

1. A nuclear island gate valve leakage ring lifting device, characterized by: It includes a support screw, a pulling bracket, a lifting nut, an operating handle, a lifting sleeve, an anti-rotation handle, and a lifting screw; the upper end of the support screw is placed on the valve yoke, the lower end of the support screw is placed on the pulling bracket, the pulling bracket is installed on the valve stem, the half-type lifting nut is spliced ​​and installed on the threaded sleeve at the bottom end of the pulling bracket and connected by a set screw, the half-type lifting sleeve is hung on the lower end of the lifting nut, the lower end of the lifting screw is screwed into the original lifting hole and the new lifting hole of the leakage ring, the height of the lifting sleeve is adjusted by rotating, and the upper end of the lifting screw is placed in the screw hole of the lifting sleeve The inner nut is tightened and fixed, and the operating handle and the anti-rotation handle are respectively placed in the operating holes around the lifting nut and the lifting sleeve. The pulling bracket is fixed through the original bolt hole of the valve and the support screw. The upper end of the support screw is placed in the threaded hole on the valve yoke and locked with a nut; the lower end of the support screw is placed in the slotted hole on the pulling bracket and locked with a nut; the set screw connects the two half-type pulling brackets; the lower end of the lifting nut is provided with an L-shaped concave edge and the upper end of the lifting sleeve is provided with a 7-shaped convex edge to match and hang the lifting nut to realize the upward rotation of the lifting nut During movement, the lifting loop does not rotate with it and moves upward in a straight line, ensuring that the lifting screw only bears the tension in the vertical direction; before using the lifting device, first drill a new lifting hole on the leakage guide ring, and then use the lifting device. If the leakage guide ring is slightly stuck, it can be lifted and removed in this step. If it cannot be removed, then: connect the lifting screw to the bracket. The bracket includes four connecting rods. The ends of the four connecting rods are rotatably connected by end shaft hinges. The end shaft hinges adopt a detachable connection method so that the four connecting rods are connected to the end of the valve stem to form a bracket. Each end shaft hinge is connected to a A telescopic mechanism, a roller supporting the valve stem is provided at the end of the telescopic rod of the telescopic mechanism, and the rotating shaft of the roller is perpendicular to the valve stem, so that the roller can roll up and down along the valve stem, and the middle part of each connecting rod is connected to the upper end of the lifting screw; the bracket also includes a lifting ring for connecting to the half-type lifting sleeve, and the lifting ring is a split type, including two semicircular ring bodies, and the two semicircular ring bodies are connected into a circular lifting ring by bolts, and a radial hole is provided on the lifting ring, and the cylinder body of the telescopic mechanism is slidably set in the radial hole, so that the lifting screw is lifted upward by pulling the lifting ring.

2. The nuclear island gate valve leakage ring lifting device according to claim 1 is characterized in that: The lifting loop is hung on the lower end of the lifting nut and connected by a set screw.

3. The nuclear island gate valve leakage ring lifting device according to claim 1 is characterized in that: When working, turn the operating handle and use your hand to fix the handle to prevent it from turning. The lifting nut drives the lifting sleeve to move upward, drives the pulling screw to move upward, and then drives the leakage ring to move upward until it is lifted and taken out to the appropriate position.

4. The nuclear island gate valve leakage ring lifting device according to claim 1 is characterized in that: When in use, adjust the extension amount of one telescopic mechanism flexibly, then rotate or pull the leak guide ring to see if the jam is eliminated. If not, adjust the extension amount of the next one or two telescopic mechanisms until the jam is eliminated. The jam can also be eliminated by rotating the lifting ring so that the lifting screw drives the leakage ring to rotate. During the rotation, all the telescopic mechanisms are contracted, so that the roller leaves the valve stem, so that the bracket can rotate relative to the valve stem.

5. The nuclear island gate valve leakage ring lifting 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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