Lifting device for leakage guide ring of nuclear island gate valve

Abstract

The invention belongs to the technical field of valve maintenance, and particularly relates to a lifting device for a leakage guide ring of a nuclear island gate valve. The upper end of the supporting screw rod is arranged on a valve yoke frame, the lower end of the supporting screw rod is arranged on the drawing support, the drawing support is installed on a valve rod, the half-and-half type lifting nut is installed at the position of a threaded sleeve at the bottom end of the drawing support in a spliced mode and connected with the threaded sleeve through the set screw, and the half-and-half type lifting loop is connected to the lower end of the lifting nut in a hung mode. The lower end of the lifting screw rod is screwed into the original lifting hole and the new lifting hole of the leakage guiding ring, the height of the lifting loop is adjusted in a rotating mode, the upper end of the lifting screw rod is arranged in a screw hole of the lifting loop and is screwed and fixed through a nut, and the operating handle and the rotation preventing handle are arranged in the lifting nut and operating holes in the periphery of the lifting loop respectively. And the drawing bracket is fixed by connecting the original bolt hole of the valve with the supporting screw rod. On the premise of fully considering the limited operation space, the leakage guiding ring is efficiently detached, meanwhile, the complete effect of the leakage guiding ring is guaranteed, and the leakage guiding ring can be repeatedly used.

Description

Technical Field

[0001] The invention belongs to the technical field of valve maintenance, and particularly relates to a lifting device for a leakage guiding ring of a nuclear island gate valve. Background Art

[0002] The nuclear island gate valve is used for controlling the state of the primary loop system of a power plant. After long-term operation, the system medium will be radioactive. Usually, a packing leakage guiding ring is designed at the valve stem seal of the gate valve to collect the leaked medium at the valve stem packing and drain it into a sealed container or system, thereby avoiding the situation of medium leakage and environmental pollution caused by the failure of the valve stem packing seal.

[0003] During the maintenance of the gate valve, it is necessary to remove the packing leakage guiding ring and perform packing replacement operations above and below. Due to reasons such as corrosion generated during operation, foreign matters such as packing wear getting stuck between the leakage guiding ring and the inner wall of the stuffing box, the method of using the original special tool to remove the leakage guiding ring fails, and the packing below it cannot be replaced, resulting in the system running with defects for a long time. The packing below the leakage guiding ring is damaged and continues to deteriorate, which will cause the primary loop system of the unit to lose inventory control.

[0004] Currently, at home and abroad, in response to the situation where the leakage guiding ring is stuck and cannot be removed, the method is to select the electric discharge machining process to perform on-line cutting on the packing leakage guiding ring, and design a special tool to remove the cut packing leakage guiding ring. This method not only has a long cutting time, the electric discharge cooling system occupies a large space, but also requires at least 5 operators to cooperate with the maintenance operation, with high costs and low efficiency. In order to improve the removal efficiency of the leakage guiding ring and avoid complete damage to the leakage guiding ring, so that the removed leakage guiding ring can still be reused, a new tool is needed to quickly remove the leakage guiding ring without damage. Summary of the Invention

[0005] The purpose of the invention is to provide a lifting device for a leakage guiding ring of a nuclear island gate valve. In order to non-destructively remove the leakage guiding ring of the nuclear island gate valve online, on the premise of fully considering the limited operation space, the removal of the leakage guiding ring can be efficiently completed while ensuring its intact function and being reusable.

[0006] To achieve the above purpose, the technical solution adopted by the invention is as follows: A leakage guiding ring lifting device for a nuclear island gate valve, comprising a support screw rod, a drawing bracket, a lifting nut, an operating handle, a lifting loose sleeve, a rotation prevention handle, and a lifting screw rod; the upper end of the support screw rod is placed in the valve yoke, and the lower end of the support screw rod is placed on the drawing bracket, the drawing bracket is installed on the valve stem, the split-type lifting nut is spliced and installed at the threaded sleeve at the bottom end of the drawing bracket and connected by a set screw, the split-type lifting loose sleeve is hung at the lower end of the lifting nut, the lower end of the lifting screw rod is screwed into the original lifting hole and the new lifting hole of the leakage guiding ring, the height of the lifting loose sleeve is adjusted by rotation, the upper end of the lifting screw rod is placed in the threaded hole of the lifting loose sleeve and tightened and fixed with a nut, the operating handle and the rotation prevention handle are respectively placed in the operating holes around the lifting nut and the lifting loose sleeve, and the drawing bracket is fixed by connecting with the support screw rod through the original bolt hole of the valve.

[0007] The upper end of the support screw rod is placed in the threaded hole of the valve yoke and locked with a nut; the lower end of the support screw rod is placed in the slotted hole of the drawing bracket and locked with a nut.

[0008] The set screw connects the two split-type drawing brackets.

[0009] The lifting loose sleeve is hung at the lower end of the lifting nut and connected by a set screw.

[0010] A circular concave edge in an L shape is arranged at the lower end of the lifting nut to be matched and hung with a convex edge in a 7 shape arranged at the upper end of the lifting loose sleeve, so that when the lifting nut rotates and moves upward, the lifting loose sleeve does not rotate with it but moves upward linearly, ensuring that the lifting screw rod only bears the pulling force in the vertical direction.

[0011] During operation, the operating handle is rotated and the rotation prevention handle is fixed by hand, the lifting nut drives the lifting loose sleeve to move upward, drives the lifting screw rod to move upward, and further drives the leakage guiding ring to move upward until it is lifted out to a proper position.

[0012] Before using this lifting device, first drill a new lifting hole in the leakage guiding ring, and then use the lifting device. If the leakage guiding ring is slightly stuck, it can be lifted out in this step. If it cannot be taken out, continue with the next step of disassembling the lifting device.

[0013] If it cannot be taken out: The lifting screw is connected 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 are detachably connected, so that the four connecting rods can be connected end to end around the valve stem to form a bracket. Each end shaft hinge is connected with a telescopic mechanism. The end of the telescopic rod of the telescopic mechanism is provided with a roller for supporting the valve stem. The rotating shaft of the roller is perpendicular to the valve stem, which is convenient for the roller to roll up and down along the valve stem. The middle of each connecting rod is connected to the upper end of the lifting screw; The bracket also includes a lifting ring for connecting with the split lifting collar. The lifting ring is split, including two semi-circular ring bodies. The two semi-circular ring bodies are connected into a circular lifting ring by bolts. The lifting ring is provided with radial holes. The cylinder body of the telescopic mechanism is slidably arranged in the radial holes, so as to lift the lifting screw upward by lifting the lifting ring.

[0014] During use, after elastically adjusting the telescopic amount of one telescopic mechanism, rotate or lift the leak guiding ring to see if the jamming is eliminated. If not, adjust the telescopic amount of the next or two telescopic mechanisms until the jamming is eliminated; It is also possible to rotate the lifting ring so that the lifting screw drives the leak guiding ring to rotate to eliminate the jamming. When rotating, all the telescopic mechanisms contract, so that the rollers leave the valve stem, which is convenient for the bracket to rotate relative to the valve stem.

[0015] The telescopic mechanism is a pneumatic cylinder, a hydraulic cylinder, an electric cylinder or a screw-nut telescopic mechanism driven manually.

[0016] The beneficial effects obtained by the present invention are as follows: The present invention is composed of a drawing bracket, a support screw, a drawing screw, a lifting nut, a lifting collar, etc. Its function is to lift the leak guiding ring to a suitable position and then replace the lower packing of the leak guiding ring. During operation, the support screw is fixed to the threaded hole at the top of the valve by bolts. The split drawing bracket (including the threaded sleeve) holds the valve stem tightly. After the lower end of the lifting screw is fastened to the lifting hole of the leak guiding ring, the split lifting nut is placed at the lower end of the threaded sleeve of the drawing bracket. After the lifting collar is hung and assembled with the lifting nut, when the lifting nut rotates, the lifting collar and the lifting screw only bear the vertical tension and do not bear the torque and shear force. The upper end of the lifting screw passes through the threaded hole at the lower end of the lifting collar and is locked with a nut. Slowly rotate the lifting nut to drive the lifting screw to lift synchronously and lift out the leak guiding ring.

[0017] When using this device to remove the leak guiding ring, the removed leak guiding ring is complete and in good working condition. It can be used continuously after replacing the packing, which is a breakthrough in the on-line disassembly tooling of electric gate valves; While improving work efficiency, it reduces time and labor costs, and at the same time reduces the irradiation dose and collective irradiation dose of workers in high-radiation environments; The whole device is convenient for disassembly and assembly. The operator only needs two wrenches on site to complete the disassembly and assembly of the tool, reducing the safety operation risk during use; This device is convenient to carry and transport. Description of the Drawings

[0018] Figure 1 Schematic installation diagram of a leakage ring lifting device for a nuclear island gate valve; Figure 2 Schematic structural diagram of a leakage ring lifting device for a nuclear island gate valve; Figure 3 Top view schematic diagram when a leakage ring lifting device for a nuclear island gate valve is in use; Figure 4 Schematic structural diagram of the leakage ring; 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 loose sleeve; 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 implementation manners

[0019] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] As Figures 1-4As shown in the figure, the main function of a leakage guiding ring lifting device 12 for a nuclear island gate valve is to lift and remove the leakage guiding ring 2. During assembly, first, according to the actual on-site situation, measure and confirm the appropriate position of the pulling bracket 1202. Place the upper end of the support screw 1201 into the threaded hole on the valve yoke 1 and lock it with a nut. Place the lower end of the support screw 1201 into the slotted hole of the pulling bracket 1202 and lock it with a nut. Install the pulling bracket 1202 on the valve stem 4, and use a set screw to reliably connect the two split pulling brackets 1202. Splice and install the split lifting nut 1203 at the threaded sleeve at the bottom end of the pulling bracket 1202 and make a reliable connection through a set screw. Hang the split lifting collar 1205 on the lower end of the lifting nut 1203 and make a reliable connection through a set screw. Screw the lower ends of the lifting screws 1207 (2 or 4 pieces) into the original lifting holes 202 and new lifting holes 203 of the leakage guiding ring 2. Rotate and adjust the height of the lifting collar 1205, place the upper ends of the lifting screws 1207 into the threaded holes of the lifting collar 1205, and tighten and fix them with nuts. Place the operating handle 1204 and the anti-rotation handle 1206 into the operating holes around the conveniently operable lifting nut 1203 and lifting collar 1205 respectively. Fix the pulling bracket 1202 by connecting it through the original bolt holes of the valve. The lifting nut 1203 and the lifting collar 1205 are matched and hung by a concave edge in an "L" shape arranged in a circle at the lower end of the lifting nut 1203 and a convex edge in a "7" shape arranged at the upper end of the lifting collar 1205. When the lifting nut 1203 rotates upward, the lifting collar 1205 does not rotate with it but moves upward in a straight line, ensuring that the lifting screw 1207 only bears the vertical upward pulling force. During operation, rotate the operating handle 1204 and fix the anti-rotation handle 1206 by hand. The lifting nut 1203 drives the lifting collar 1205 to move upward, drives the lifting screw 1207 to move upward, and further drives the leakage guiding ring 2 to move upward until it is lifted and removed to an appropriate position. The setting of the handle further ensures that the lifting collar 1205 does not rotate with the lifting nut 1203. The lifting and removing device has a simple structure and is convenient to operate, and can directly remove the entire leakage guiding ring of the valve, improving the replacement efficiency of the seal.

[0021] Before using this lifting device, first drill a new lifting hole 203 in the leakage guiding ring 2, and then use the lifting device 12. Place the upper ends of the two lifting screws 1207 into the threaded holes of the lifting collar 1205, and screw the lower ends into the original lifting holes 202 of the leakage guiding ring 2. Operate the operating handle 1204 with appropriate force and fix the anti-rotation handle 1206 by hand to drive the synchronous lifting of the lifting screws 1207. If the jamming of the leakage guiding ring 2 is relatively slight, it can be lifted and removed in this step. If it cannot be removed, continue with the next step and disassemble the lifting device 12. Different from the above embodiments: In this embodiment, the lifting screw 1207 is connected to the bracket. The bracket includes four connecting rods 61. The ends of the four connecting rods 61 are rotatably connected by end shaft hinges 62. The end shaft hinges 62 are detachably connected, so that the four connecting rods 61 can be connected end to end around the valve stem 4 to form a bracket. Each end shaft hinge 62 is connected with a telescopic mechanism 63. The telescopic mechanism 63 can be a device capable of telescoping such as a pneumatic cylinder, a hydraulic cylinder, an electric cylinder, or a screw-nut telescopic mechanism 63 driven manually. The end of the telescopic rod of the telescopic mechanism 63 is provided with a roller 64 for supporting the valve stem 4. The axis of the roller 64 is perpendicular to the valve stem 4, so as to facilitate the roller 64 to roll up and down along the valve stem 4. The middle of each connecting rod 61 is connected to the upper end of the lifting screw 1207. It also includes a lifting ring 65 for connecting with the split lifting loop 1205. The lifting ring 65 is also split, including two semi-circular ring bodies. The two semi-circular ring bodies are connected into a circular lifting ring 65 by bolts. The lifting ring 65 is provided with a radial hole 651. The cylinder body of the telescopic 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.

[0022] Since partial jamming is likely to occur between the leakage guiding ring 2 and the inner wall of the stuffing box 5, at this time, the leakage guiding ring 2 needs to be rotated to eliminate the jamming. By controlling the telescoping of different telescopic mechanisms 63, thrust or pulling force can be provided to the leakage guiding ring 2 in different radial directions, so as to control different parts of the leakage guiding ring 2 to approach or move away from the valve stem 4, thereby eliminating the jamming. During use, after elastically adjusting the telescoping amount of one telescopic mechanism 63, the leakage guiding ring 2 can be rotated or lifted to see if the jamming is eliminated. If not, the telescoping amount of the next or two telescopic mechanisms 63 can be adjusted until the jamming is eliminated. It is also possible to rotate the lifting ring 65 so that the lifting screw 1207 drives the leakage guiding ring 2 to rotate to eliminate the jamming. When rotating, all the telescopic mechanisms 63 can be contracted so that the rollers 64 leave the valve stem 4, so as to facilitate the rotation of the bracket relative to the valve stem 4.

Claims

1. A lifting device for the leakage guiding ring of a nuclear island gate valve, characterized in that: It includes a support screw, a drawing bracket, a lifting nut, an operating handle, a lifting loose sleeve, a rotation prevention handle, and a lifting screw; the upper end of the support screw is placed in the valve yoke, and the lower end of the support screw is placed on the drawing bracket. The drawing bracket is installed on the valve stem. The split lifting nut is spliced and installed at the thread sleeve at the bottom end of the drawing bracket and connected by a set screw. The split lifting loose sleeve is hung at 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. Rotate and adjust the height of the lifting loose sleeve, place the upper end of the lifting screw into the screw hole of the lifting loose sleeve and tighten it with a nut. The operating handle and the rotation prevention handle are respectively placed in the operating holes around the lifting nut and the lifting loose sleeve, and the drawing bracket is fixed by connecting through the original bolt hole of the valve and the support screw.

2. The leakage guiding ring lifting device of the nuclear island gate valve according to claim 1, characterized in that: The upper end of the support screw is placed in the threaded hole of the valve yoke and locked with a nut; the lower end of the support screw is placed in the slotted hole of the drawing bracket and locked with a nut.

3. The nuclear island gate valve leakage guiding ring lifting device according to claim 1, characterized in that: The set screw connects the two split drawing brackets.

4. The nuclear island gate valve leakage guiding ring lifting device according to claim 1, characterized in that: The lifting loose sleeve is hung at the lower end of the lifting nut and connected by a set screw.

5. The leakage guiding ring lifting device for the nuclear island gate valve according to claim 1, characterized in that: The lower end of the lifting nut is provided with an L-shaped concave edge in a circle, which is matched and hung with the 7-shaped convex edge at the upper end of the lifting loose sleeve, so that when the lifting nut rotates upward, the lifting loose sleeve does not rotate with it but moves upward in a straight line, ensuring that the lifting screw only bears the vertical pulling force.

6. The nuclear island gate valve leakage guiding ring lifting device according to claim 1, characterized in that: During work, rotate the operating handle and fix the rotation prevention handle by hand. The lifting nut drives the lifting loose sleeve to move upward, drives the lifting screw to move upward, and then drives the leakage ring to move upward until it is lifted out to a suitable position.

7. The nuclear island gate valve leakage guiding ring lifting device according to claim 1, characterized in that: Before using the lifting device, first drill a new lifting hole in the leakage ring, and then use the lifting device. If the leakage ring is slightly stuck, it can be lifted out in this step. If it cannot be taken out, continue with the next step of disassembling the lifting device.

8. The nuclear island gate valve leakage guiding ring lifting device according to claim 7, characterized in that: If it cannot be taken out, then: the lifting screw is connected 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 are connected in a detachable manner, so that the four connecting rods can be connected end to end around the valve stem to form a bracket. Each end shaft hinge is connected with a telescopic mechanism. The end of the telescopic rod of the telescopic mechanism is provided with a roller for supporting the valve stem. The axis of the roller is perpendicular to the valve stem, which is convenient for the roller to roll up and down along the valve stem. The upper end of each connecting rod is connected to the lifting screw in the middle; the bracket also includes a lifting ring for connecting with the split lifting loose sleeve. The lifting ring is split, including two semi-circular ring bodies. The two semi-circular ring bodies are connected into a circular lifting ring by bolts. The lifting ring is provided with radial holes, and the cylinder body of the telescopic mechanism is slidably arranged in the radial holes, so as to lift the lifting screw upward by lifting the lifting ring.

9. The leakage guiding ring lifting device for the nuclear island gate valve according to claim 8, characterized in that: When using, after elastically adjusting the telescopic amount of one telescopic mechanism, then rotate or lift the leakage ring to see if the jamming is eliminated. If it is not eliminated, then adjust the telescopic amount of the next or two telescopic mechanisms until the jamming is eliminated. It is also possible to eliminate the jamming by rotating the lifting ring, so that the lifting screw drives the leakage ring to rotate. When rotating, all the telescopic mechanisms contract, so that the rollers leave the valve stem, which is convenient for the bracket to rotate relative to the valve stem.

10. The leakage guiding ring lifting device for the nuclear island gate valve according to claim 8, characterized in that: The telescopic mechanism is a pneumatic cylinder, a hydraulic cylinder, an electric cylinder or a screw and nut telescopic mechanism driven manually for telescoping.

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