Laser destruction online dismounting nuclear island gate valve leakage ring device

Abstract

The application belongs to the technical field of valve maintenance, and particularly relates to a laser destructive online dismounting and taking device for a leakage ring of a nuclear island gate valve. The device comprises a driving device driving structure, a driving device driven structure, a leakage ring inner ring taking tool and a leakage ring outer ring taking tool. The driving device driving structure comprises a support rod supported outside a valve base, a fixing frame fixed outside a valve yoke, a servo motor and a driving gear installed on the fixing frame, and the servo motor is connected with an external control assembly and drives the driving gear to rotate when the external control assembly works. The driving device driven structure comprises a split sliding rail fixed on a valve rod, a sliding block with an upper end hung in a ring-shaped groove at a lower end of the sliding rail and a lower end connected with a driven gear, and the driven gear drives the sliding block to rotate along the sliding rail groove when rotating, a laser adapter plate is fixed on the driven gear and rotates with the driven gear, and a laser device is arranged on the laser adapter plate. The device can realize automatic control of the whole cutting process of the leakage ring.

Description

Technical Field

[0001] This invention belongs to the field of valve maintenance technology, specifically relating to a laser-based online destructive device for removing leakage rings from nuclear island gate valves. Background Technology

[0002] Nuclear island gate valves are used for status control of the primary circuit system in power plants. After long-term operation, the system medium may become radioactive. A packing ring is usually designed at the valve stem seal to collect the leaked medium at the valve stem and guide it to the sealed container or system, thereby avoiding the situation where the medium escapes and pollutes the environment due to the failure of the valve stem seal.

[0003] During gate valve maintenance, the packing guide ring needs to be removed and the packing above and below replaced. However, due to corrosion and foreign matter from packing wear becoming lodged between the guide ring and the inner wall of the stuffing box during operation, the original tools used to remove the guide ring become ineffective. This prevents replacement of the packing below it, causing the system to operate with defects for an extended period. The damaged and continuously deteriorating packing below the guide ring will lead to a loss of load control in the unit's primary circuit.

[0004] Currently, the domestic and international approach to dealing with stuck packing vent rings involves using electrical discharge machining (EDM) to cut the vent ring online and then designing specialized tools to remove it. This method is not only time-consuming and requires a large space for the EDM cooling system, but also necessitates at least five operators for maintenance, resulting in high costs and low efficiency. Therefore, to efficiently remove packing vent rings from nuclear island gate valves, improve maintenance efficiency, and reduce radiation dose for operators, a laser-based destructive online removal device and operating method for nuclear island gate valve vent rings has been invented. Summary of the Invention

[0005] The purpose of this invention is to provide a laser-based online destructive device for removing the leakage ring of a nuclear island gate valve. Firstly, it offers a high degree of automation, enabling automated control of the entire leakage ring cutting process, effectively shortening operation time, reducing the number of operators, improving work efficiency, and lowering the radiation dose for workers in high-radiation environments and the collective radiation dose. Secondly, it can replace leakage rings of electrically forged carbon steel welded gate valves of different sizes and structures; one device can be applied to the replacement of leakage rings for all existing heavy water gate valves of various specifications and sizes. Thirdly, it reduces the probability of human error, saves overall and individual working time, reduces overall labor intensity, and minimizes operator fatigue.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A laser-based online destructive device for removing the drain ring of a nuclear island gate valve includes an active drive structure, a driven drive structure, a drain ring inner ring removal tool, and a drain ring outer ring removal tool. The active drive structure includes a support rod supported on the outside of the valve base, a fixing frame fixed on the outside of the valve yoke, and a servo motor and a drive gear mounted on the fixing frame. The servo motor, connected to an external control component, drives the drive gear to rotate during operation. The driven drive structure includes a split slide rail fixed to the valve stem, with a slider hanging from its upper end. The slide rail is connected to the annular groove at its lower end, and the lower end is connected to the driven gear. When the driven gear rotates, it drives the slider to rotate along the groove of the slide rail. The laser adapter plate is fixed on the driven gear and rotates together with the driven gear. The laser is placed on the laser adapter plate. When the tool for removing the inner ring of the drain ring is working, first insert the inner ring removal jaws into the cut gap of the drain ring. After adjusting the appropriate position, lock the two halves of the inner ring removal lifting rod clamp. Then, pre-tighten and lock the clamps so that the inner ring removal jaws grip the inner ring of the drain ring tightly. Then, use the inner ring removal lifting rod... After rotating the inner ring extraction tool to a suitable operating position, pull the inner ring extraction lever upwards to remove the inner ring. The outer ring extraction tool includes a clamp, with a PTFE pad between the clamp and the valve stem. During operation, install the PTFE pad and clamp at a suitable height according to the height of the outer ring extraction jaws. Assemble the upper groove of the outer ring extraction jaws with the lower flange of the clamp, and assemble the upper flange of the anti-detachment pad with the middle groove of the outer ring extraction jaws. Adjust the position of the outer ring extraction jaws until their lower end... The protruding cylinder is inserted into the drainage hole of the outer ring. The anti-detachment pad is rotated so that its lower protrusion corresponds to the protruding cylinder of the outer ring removal claw. This prevents the protruding cylinder of the outer ring removal claw from falling out of the drainage hole when the outer ring of the leakage ring is lifted. The lifting rod is connected to the slider. The outer ring removal lifting rod is installed to a suitable operating position and tightened. Then, the outer ring removal lifting rod is rotated to a suitable operating position and lifted upwards. This causes the slider to strike and lift, driving the leakage ring removal tool to lift and remove the outer ring of the leakage ring.

[0008] The fixing bracket is fixed to the outside of the valve yoke by locking bolt A and set screw. The set screw can be adjusted to accommodate valve yokes of different diameters.

[0009] The slide rail is fixed to the valve stem by locking bolt B.

[0010] The slider has a split structure.

[0011] The lower end of the slider is connected to the driven gear via a large screw.

[0012] The laser includes a laser cutting head and an air source inlet. The laser adapter plate is fixed to the driven gear by small screws.

[0013] The laser cutting head focuses and transmits the laser beam. The gas source inlet connects to the gas source, which provides the gas required for the cutting process. The laser beam emitted by the laser cutting head is focused into a very small spot at the focal point. When the spot irradiates the drain ring, it is quickly heated to the vaporization temperature and evaporates to form a hole. As the beam moves and the auxiliary gas blows away the molten slag, the hole continuously forms a very narrow slit, completing the cutting of the drain ring.

[0014] The control components include a servo motor motion controller and a laser controller. The servo motor motion controller controls the rotation speed of the laser, the laser controller controls the laser cutting power, and the servo motor motion controller controls the start of the servo motor, which drives the drive gear to rotate. The drive gear drives the driven gear to rotate, thereby driving the laser to rotate around the valve stem, thus achieving circumferential cutting of the leakage ring.

[0015] Remove the two halves of the lifting rod by locking the inner ring, and then pre-tighten and lock the clamps with bolts; the lifting rod is connected to the slider by threads; the pad protrusion is set on the anti-detachment pad.

[0016] A laser-based destructive online method for removing the leakage ring from a nuclear island gate valve:

[0017] The first step is to install the driven structure of the drive device: place the positioning rod between the leakage ring and the slide rail and fix it on the valve stem. After fixing, remove the positioning rod, connect the slider and the driven gear and install them on the slide rail.

[0018] The second step is to install the laser: First, fix the laser cutting head to the laser adapter plate with small screws, and then install the laser adapter plate on the driven gear.

[0019] The third step is to install the active structure of the drive unit: use the expansion sleeve to fix the drive gear and the servo motor drive shaft, and install the servo motor and drive gear onto the fixed frame; install the fixed frame on the outside of the valve yoke, adjust the fixed frame to a suitable height through the support rod so that the drive gear and the driven gear are fully meshed, and tighten the locking bolt A and the set screw;

[0020] The fourth step is to complete the connection of the servo motor cable and control components, complete the air supply connection, check that the circuit is correct, power on the machine and perform system initialization.

[0021] The fifth step is to perform laser cutting. The servo motor drives the drive gear to rotate, and the drive gear drives the driven gear to move, so that the laser moves along the circumference of the siphon ring to complete the laser destructive cutting.

[0022] Step 6: Dismantle the active structure and driven structure of the drive unit;

[0023] Step 7: Install the tool for removing the inner ring of the drain ring: initially insert the inner ring removal claw into the cut gap of the drain ring, adjust the position appropriately, lock the two halves of the inner ring removal lifting rod clamp, and then pre-tighten and lock the clamp with bolts so that the inner ring removal claw grips the inner ring of the drain ring tightly.

[0024] Step 8: Pull out the inner ring of the drain ring: After rotating the drain ring inner ring removal tool to a suitable operating position, pull the inner ring removal lever upwards to remove the drain ring inner ring.

[0025] Step 9: Remove the inner ring of the drain ring and take out the tool;

[0026] Step 10: Install the outer ring removal tool for the drain ring: Install the PTFE pad and clamp at a suitable height according to the height of the outer ring removal claw. Assemble the upper groove of the outer ring removal claw with the lower protrusion of the clamp. Assemble the upper protrusion of the anti-detachment pad with the middle groove of the outer ring removal claw. Adjust the position of the outer ring removal claw until its lower protruding cylinder is inserted into the drain hole of the outer ring. Adjust the position of the anti-detachment pad so that its lower protrusion corresponds to the protruding cylinder of the outer ring removal claw. Install the outer ring removal lifting rod to a suitable operating position and tighten it.

[0027] Step 11: Pull out the inner ring of the drain ring: After rotating the outer ring removal lever to a suitable operating position, pull the outer ring removal lever upward to remove the outer ring of the drain ring;

[0028] Step 12: Remove the tool for removing the outer ring of the drain ring, thus completing the entire drain ring removal process.

[0029] The beneficial effects achieved by this invention are as follows:

[0030] This invention better satisfies the need for complete removal of the leak-inducing ring from various types of valves, helps improve work efficiency, has universality, and can be used in valve maintenance work for a long time, forming a good demonstration and promotion; at the same time, this device can be applied to the cutting and processing of parts in narrow gap, deep annular, confined spaces.

[0031] (1) Existing electrical discharge machining methods require real-time operation by staff. This invention, by pre-simulating and setting the laser path, allows for remote operation via a control platform combined with real-time visual positioning equipment after the device is installed, significantly reducing the radiation dose to personnel.

[0032] (2) The existing electrical discharge machining method requires the preparation of an electrical discharge control platform and an actuator, which weighs up to 150 kg and is relatively large in size. The space for removing the valve leakage ring is limited and narrow. This invention processes and decomposes the mechanical parts in the device to form multiple parts that are easy to transport and install, thereby realizing small gap (10 mm) and large depth (100 mm) laser cutting operation.

[0033] (3) The existing electrical discharge machining method requires 5 people to operate for 9 days to complete the removal of the leakage ring. This invention uses an ultra-short pulse fiber laser and a miniaturized optical focusing module to develop a high-efficiency narrow space laser cutting process. While improving the probability of successfully removing the leakage ring, it also improves work efficiency. The removal of the stuck leakage ring can be completed by 2 people in 8 hours. Compared with the electrical discharge machining technology, the time for removing the leakage ring is shortened by about 95%, the number of personnel is reduced by 60%, and the work efficiency is improved while reducing time and labor costs. At the same time, it reduces the radiation dose of workers in high radiation environments and the collective radiation dose.

[0034] (4) Compared with the existing non-destructive removal technology for the drain ring, the non-destructive removal of the drain ring has a high probability of failure when removing the drain ring with a very serious jamming degree. The present invention does not have requirements on the degree of jamming when removing the drain ring, and has fewer limitations. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the laser-cut section;

[0036] Figure 2 This is a schematic diagram of the active structure of the drive unit;

[0037] Figure 3 This is a schematic diagram of the driven structure of the drive device;

[0038] Figure 4 This is a schematic diagram of the inner ring removal structure for the drain ring removal section;

[0039] Figure 5 This is a schematic diagram of the structure for removing the outer ring of the drain ring.

[0040] Figure 6 This is a schematic diagram of the drain ring structure after laser cutting;

[0041] In the diagram: 1. Valve base; 2. Valve yoke; 3. Valve stem; 4. Drain ring; 401. Outer ring of the drain ring after laser cutting; 402. Inner ring of the drain ring after laser cutting; 403. Drain hole; 5. Active structure of the drive unit; 501. Support rod; 502. Fixing bracket; 503. Set screw; 504. Locking bolt A; 505. Servo motor; 506. Drive gear; 6. Driven structure of the drive unit; 601. Driven gear; 602. Slider; 603. Slide rail; 604. Laser adapter plate; 605. Locking bolt B; 606. Large... Screws; 607. Small screws; 7. Positioning rods; 8. Laser; 801. Laser cutting head; 802. Air source inlet; 9. Tool for removing the inner ring of the drain ring; 901. Inner ring removal lifting rod; 902. Clamps; 903. Inner ring removal grippers; 904. Bolts; 10. Tool for removing the outer ring of the drain ring; 1001. PTFE padding; 1002. Clamps; 1003. Outer ring removal lifting rod; 1004. Outer ring removal grippers; 1005. Anti-detachment padding; 1006. Raised cylinder; 1007. Pad protrusion; 1008. Slider. Detailed Implementation

[0042] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0043] like Figure 1 As shown in Figure 6, a laser-based online destructive device for removing the leakage ring of a nuclear island gate valve consists of an active drive structure 5, a driven drive structure 6, an inner leakage ring removal tool 9, and an outer leakage ring removal tool 10.

[0044] The active structure 5 of the drive unit is designed with a support rod 501 that supports the outside of the valve base 1 and is responsible for adjusting the height and level of the fixed frame 502. The fixed frame 502 is fixed to the outside of the valve yoke 2 by locking bolts A504 and set screws 503. The set screws 503 can be adjusted to accommodate valve yokes 2 of different diameters. The servo motor 505 and the drive gear 506 are installed on the fixed frame 502. When the servo motor 505 is connected to the external control component, it drives the drive gear 506 to rotate.

[0045] The driven structure 6 of the drive device is designed with a split slide rail 603, which is fixed to the valve stem 3 by locking bolt B605. Its position is determined by the positioning rod 7. The slider 602 is a split structure. Its upper end is attached to the annular groove at the lower end of the slide rail 603, and its lower end is connected to the driven gear 601 by a large screw 606. When the driven gear 601 rotates, it drives the slider 602 to rotate along the groove of the slide rail 603. The laser adapter plate 604 is fixed to the driven gear 601 by a small screw 607 and rotates together with the driven gear 601.

[0046] The laser 8 includes a laser cutting head 801 and a gas source inlet 802, which are mounted on the laser adapter plate 604. The laser cutting head 801 is used to focus and transmit the laser beam, and the gas source inlet 802 is used to connect to a gas source, which provides the gas required for the cutting operation. The laser beam emitted by the laser cutting head 801 is focused into a very small spot at the focal point. When the spot irradiates the drain ring 4, it is quickly heated to the vaporization temperature, evaporating to form a hole. As the beam moves, and with the help of auxiliary gas blowing away the molten slag, the hole continuously forms a very narrow slit, completing the cutting of the drain ring 4.

[0047] The control components are located within the control operating system and include a servo motor motion controller and a laser controller. The servo motor motion controller controls the rotation speed of the laser cutting head 801, while the laser controller controls the laser cutting power. The control components start the servo motor 505 via the motion controller, which drives the drive gear 506 to rotate. The drive gear 506 drives the driven gear 601 to rotate, thereby causing the laser 8 to rotate around the valve stem 3, achieving circumferential cutting of the leakage ring 4.

[0048] When the inner ring removal tool 9 is working, first insert the inner ring removal jaws 903 into the cut gap of the leakage ring 4. After adjusting to a suitable position, lock the two halves of the inner ring removal lifting rod 901. Then, use bolts 904 to pre-tighten and lock the clamps 902, so that the inner ring removal jaws 903 hold the inner ring 402 of the leakage ring tightly. Then, use the inner ring removal lifting rod 901 to rotate the inner ring removal tool 9 to a suitable operating position, and then pull the inner ring removal lifting rod 901 upward to pull out the inner ring 402 of the leakage ring.

[0049] The outer ring removal tool 10 adds a polytetrafluoroethylene (PTFE) pad 1001 between the clamp 1002 and the valve stem 3. The number and thickness of the pad can meet the requirements of fixing the clamp 1002 to valve stems 3 of different sizes. During operation, the PTFE pad 1001 and the clamp 1002 are installed at a suitable height according to the height of the outer ring removal claw 1004. The upper groove of the outer ring removal claw 1004 is assembled with the lower protrusion of the clamp 1002. The upper protrusion of the anti-detachment pad 1005 is assembled with the middle groove of the outer ring removal claw 1004. The position of the outer ring removal claw 1004 is adjusted until the protruding cylinder 1006 at its lower end is inserted into the outer ring. Inside the flow hole 403, rotate the anti-detachment pad 1005 so that its lower protruding position corresponds to the protruding cylinder 1006 of the outer ring removal gripper 1004. This prevents the protruding cylinder 1006 of the outer ring removal gripper 1004 from falling out of the flow hole 403 when the outer ring of the drain ring 401 is pulled up. Secure the outer ring removal lifting rod 1003 to a suitable operating position using screws at various points. Then, rotate the outer ring removal lifting rod 1003 to the suitable operating position and pull it upwards. This causes the slider 1008 to strike and pull, thus pulling the drain ring outer ring removal tool 10 out of the drain ring 401. The lifting rod 1003 is threaded onto the slider 1008. The pad protrusion 1007 is located on the anti-detachment pad 1005 and is integral with it.

[0050] A laser-based destructive online removal device for the leakage ring of a nuclear island gate valve, the method of use is as follows:

[0051] First, install the driven structure 6 of the drive device: place the positioning rod 7 between the leakage ring 4 and the slide rail 603 and fix it on the valve stem 3. After fixing, take out the positioning rod 7, connect the slider 602 and the driven gear 601 and install them on the slide rail 603.

[0052] The second step is to install the laser 8: First, fix the laser cutting head 801 to the laser adapter plate 604 with small screws 607, and then install the laser adapter plate 604 on the driven gear 601.

[0053] The third step is to install the active structure 5 of the drive device: use the expansion sleeve to fix the drive gear 506 and the drive shaft of the servo motor 505 to achieve a tight connection between the shaft of the servo motor 505 and the drive gear 506; install the servo motor 505 and the drive gear 506 onto the fixing bracket 502; install the fixing bracket 502 on the outside of the valve yoke 2, adjust the fixing bracket 502 to a suitable height through the support rod 501 so that the drive gear 506 and the driven gear 601 are fully meshed, and tighten the locking bolt A504 and the set screw 503;

[0054] Step 4: Complete the installation of components such as laser 8: Complete the quick connection of servo motor 505 cable and control components, complete the air source connection, check that the circuit is correct, power on and perform system initialization;

[0055] The fifth step is to perform laser cutting. The servo motor 505 is controlled to drive the drive gear 506 to rotate, and the drive gear 506 drives the driven gear 601 to move, so that the laser 8 moves along the circumference of the leakage ring 4 to complete the laser destructive cutting.

[0056] Step 6: Remove the active structure 5 and the driven structure 6 of the drive unit.

[0057] Step 7, install the inner ring removal tool 9: initially insert the inner ring removal claw 903 into the cut gap of the leakage ring 4, adjust the appropriate position, lock the two halves of the inner ring removal lifting rod 901, and then pre-tighten and lock the clamp 902 with the bolt 904 so that the inner ring removal claw 903 grips the inner ring 402 of the leakage ring.

[0058] Step 8, pull out the inner ring 402 of the leakage ring: After rotating the inner ring removal tool 9 of the leakage ring to a suitable operating position, pull the inner ring removal lifting rod 901 upward to pull out the inner ring 402 of the leakage ring.

[0059] Step 9: Remove the inner ring of the drain ring and take out tool 9;

[0060] Step 10, Install the outer ring removal tool 10: Install the PTFE pad 1001 and clamp 1002 at a suitable height according to the height of the outer ring removal claw 1004. Assemble the upper groove of the outer ring removal claw 1004 with the lower protrusion of the clamp 1002. Assemble the upper protrusion of the anti-detachment pad 1005 with the middle groove of the outer ring removal claw 1004. Adjust the position of the outer ring removal claw 1004 until its lower protruding cylinder 1006 is inserted into the drainage hole 403 of the outer ring. Adjust the position of the anti-detachment pad 1005 so that its lower protruding position corresponds to the protruding cylinder 1006 of the outer ring removal claw 1004. Tighten the screws at all locations. Install the outer ring removal lifting rod 1003 to a suitable operating position and tighten it.

[0061] Step 11: Pull out the inner ring 401 of the leakage-inducing ring: After rotating the outer ring removal lifting rod 1003 to a suitable operating position, pull the outer ring removal lifting rod 1003 upward to pull out the outer ring 401 of the leakage-inducing ring;

[0062] Step 12: Remove tool 10 from the outer ring of the leakage ring to complete the removal of the leakage ring 4.

[0063] The laser-based destructive online removal device for the leakage ring of a nuclear island gate valve comprises a laser cutting section and a leakage ring removal section. The laser cutting section uses a motor-controlled gear transmission to drive the laser, achieving a destructive cut into an inner and outer ring. The leakage ring removal section consists of specialized tools for removing the inner and outer rings, enabling the removal of the cut inner and outer rings. The laser cutting section comprises a drive unit, a laser, and control components. The drive unit includes an active structure (support rod, fixing frame, set screw, servo motor, and drive gear) and a driven structure (driven gear, slider, slide rail, and laser adapter plate), used to carry the laser cutting head to rotate circumferentially, thereby achieving circumferential cutting of the leakage ring. Because the working space between the valve yoke and the valve stem is a narrow, annular structure, a support rod is designed to support the valve base externally for convenient on-site operation. This support rod adjusts the height and level of the mounting bracket. The mounting bracket is fixed to the outside of the valve yoke using locking bolts and set screws, and the set screws can be adjusted to accommodate valve yokes of different diameters. A servo motor connects to an external control component and drives the drive gear during operation. The driven structure features a split slide rail fixed to the valve stem by locking bolts, its position determined by the positioning rod. The slider is a two-part structure; the upper end hangs in the annular groove at the lower end of the slide rail, and the lower end is connected to the driven gear by screws. When the driven gear rotates, it drives the slider to rotate along the slide rail groove. The laser mounting bracket is fixed to the driven gear by screws and rotates together with it. The laser includes a laser cutting head and a gas source inlet, mounted on a laser adapter plate. The laser cutting head focuses and transmits the laser beam, while the gas source inlet provides the necessary gas for the cutting process. The laser beam emitted by the laser cutting head is focused into a tiny spot at the focal point. When this spot illuminates the drain ring, it is quickly heated to its vaporization temperature, evaporating and forming a hole. As the beam moves, and with the assistance of auxiliary gas blowing away the molten slag, the holes continuously form very narrow slits, completing the cutting of the drain ring. The control components include a servo motor motion controller and a laser controller. The servo motor motion controller controls the rotation speed of the laser cutting head, while the laser controller controls the laser cutting power. The control components, through the motion controller, start the servo motor of the drive unit, driving the drive gear to rotate. The drive gear drives the driven gear, thereby causing the laser to rotate around the circumference of the valve stem, achieving circumferential cutting of the drain ring. The drain ring removal section consists of an inner ring removal tool and an outer ring removal tool. After the drain ring is laser-cut, an inner ring and an outer ring are formed. The removal section includes an inner ring removal tool and an outer ring removal tool. During operation, the inner ring is removed first, followed by the outer ring.The inner ring removal tool consists of a lifting rod, clamps, and grippers. During operation, the grippers are first inserted into the cut gap of the drain ring. After adjusting the position, the two halves of the lifting rod are locked. Then, the clamps are pre-tightened and locked with bolts, so that the grippers hold the inner ring of the drain ring tightly. Then, the removal device is manually rotated at a certain angle, and the inner ring of the drain ring is lifted up by using the lifting rod. The outer ring removal tool consists of a PTFE pad, clamp, lifting rod, grippers, and anti-detachment pad. The combination of the PTFE pad and clamp allows for fixing and locking valve stems of different sizes. During operation, the PTFE pad and clamp are installed at a suitable height according to the height of the grippers. The upper groove of the grippers is assembled with the lower protrusion of the clamp, and the upper protrusion of the anti-detachment pad is assembled with the middle groove of the grippers. The position of the grippers is adjusted until the lower protruding cylinder is inserted into the drainage hole of the outer ring. The position of the anti-detachment pad is adjusted so that its lower protrusion corresponds to the protruding cylinder of the grippers, preventing the protruding cylinder of the grippers from falling out of the drainage hole when the outer ring is lifted. All parts of the device are locked with screws. The lifting rod is installed to a suitable operating position and tightened. Then, the removal device is manually rotated at a certain angle, and the outer ring is lifted up by the lifting rod.

Claims

1. A laser-based destructive online removal device for the leakage ring of a nuclear island gate valve, characterized in that: The device includes an active drive structure, a driven drive structure, a tool for removing the inner ring of the drain ring, and a tool for removing the outer ring of the drain ring. The active drive structure includes a support rod that is supported outside the valve base. A fixing frame is fixed outside the valve yoke. A servo motor and a drive gear are mounted on the fixing frame. When the servo motor is connected to an external control component, it drives the drive gear to rotate. The driven drive structure includes a split slide rail that is fixed on the valve stem. The upper end of the slider is hooked into the annular groove at the lower end of the slide rail, and the lower end is connected to the driven gear. When the driven gear rotates, it drives the slider to rotate along the groove of the slide rail. A laser adapter plate is fixed on the driven gear and rotates together with the driven gear. The laser is mounted on the laser adapter plate. When using the tool to remove the inner ring of the drain ring, first insert the inner ring removal jaws into the cut gap of the drain ring. After adjusting the position, lock the two halves of the inner ring removal lifting rod clamp. Then, pre-tighten and lock the clamps to ensure the inner ring removal jaws grip the inner ring of the drain ring. Next, use the inner ring removal lifting rod to rotate the tool to a suitable operating position, and then pull the inner ring removal lifting rod upwards to remove the inner ring of the drain ring. The tool to remove the outer ring of the drain ring includes a clamp, with a PTFE pad between the clamp and the valve stem. During operation, install the PTFE pad and clamp at a suitable height according to the height of the outer ring removal jaws, and align the upper groove of the outer ring removal jaws with the clamp. The lower protruding edge is assembled, and the upper protruding edge of the anti-detachment pad is assembled with the middle groove of the outer ring removal claw. Adjust the position of the outer ring removal claw until its lower protruding cylinder is inserted into the drainage hole of the outer ring. Rotate the anti-detachment pad so that its lower protruding position corresponds to the protruding cylinder of the outer ring removal claw, to prevent the protruding cylinder of the outer ring removal claw from falling out of the drainage hole when the outer ring of the leakage ring is lifted. The lifting rod is connected to the slider. Install the outer ring removal lifting rod to a suitable operating position and tighten it. Then rotate the outer ring removal lifting rod to a suitable operating position and lift the outer ring removal lifting rod upward, so that the slider strikes and lifts, driving the leakage ring outer ring removal tool to lift and remove the leakage ring outer ring.

2. The laser-based destructive online removal device for the leakage ring of a nuclear island gate valve according to claim 1, characterized in that: The fixing bracket is fixed to the outside of the valve yoke by locking bolt A and set screw. The set screw can be adjusted to accommodate valve yokes of different diameters.

3. The laser-based destructive online removal device for the leakage ring of a nuclear island gate valve according to claim 2, characterized in that: The slide rail is fixed to the valve stem by locking bolt B.

4. The laser-based destructive online removal device for the leakage ring of a nuclear island gate valve according to claim 3, characterized in that: The slider has a split structure.

5. The laser-based destructive online removal device for the leakage ring of a nuclear island gate valve according to claim 4, characterized in that: The lower end of the slider is connected to the driven gear via a large screw.

6. The laser-based destructive online removal device for the leakage ring of a nuclear island gate valve according to claim 5, characterized in that: The laser includes a laser cutting head and an air source inlet. The laser adapter plate is fixed to the driven gear by small screws.

7. The laser-based destructive online removal device for the leakage ring of a nuclear island gate valve according to claim 6, characterized in that: The laser cutting head focuses and transmits the laser beam. The gas source inlet connects to the gas source, which provides the gas required for the cutting process. The laser beam emitted by the laser cutting head is focused into a very small spot at the focal point. When the spot irradiates the drain ring, it is quickly heated to the vaporization temperature and evaporates to form a hole. As the beam moves and the auxiliary gas blows away the molten slag, the hole continuously forms a very narrow slit, completing the cutting of the drain ring.

8. The laser-based destructive online removal device for the leakage ring of a nuclear island gate valve according to claim 7, characterized in that: The control components include a servo motor motion controller and a laser controller. The servo motor motion controller controls the rotation speed of the laser, the laser controller controls the laser cutting power, and the servo motor motion controller controls the start of the servo motor, which drives the drive gear to rotate. The drive gear drives the driven gear to rotate, thereby driving the laser to rotate around the valve stem, thus achieving circumferential cutting of the leakage ring.

9. The laser-based destructive online removal device for the leakage ring of a nuclear island gate valve according to claim 8, characterized in that: Remove the two halves of the lifting rod by locking the inner ring, and then pre-tighten and lock the clamps with bolts; the lifting rod is connected to the slider by threads; the pad protrusion is set on the anti-detachment pad.

10. A method for laser-destructive online removal of the leakage ring of a nuclear island gate valve using the laser-destructive online removal device of claim 9, characterized in that: The first step is to install the driven structure of the drive device: place the positioning rod between the leakage ring and the slide rail and fix it on the valve stem. After fixing, remove the positioning rod, connect the slider and the driven gear and install them on the slide rail. The second step is to install the laser: First, fix the laser cutting head to the laser adapter plate with small screws, and then install the laser adapter plate on the driven gear. The third step is to install the active structure of the drive unit: use the expansion sleeve to fix the drive gear and the servo motor drive shaft, and install the servo motor and drive gear onto the fixed frame; install the fixed frame on the outside of the valve yoke, adjust the fixed frame to a suitable height through the support rod so that the drive gear and the driven gear are fully meshed, and tighten the locking bolt A and the set screw; The fourth step is to complete the connection of the servo motor cable and control components, complete the air supply connection, check that the circuit is correct, power on the machine and perform system initialization. The fifth step is to perform laser cutting. The servo motor drives the drive gear to rotate, and the drive gear drives the driven gear to move, so that the laser moves along the circumference of the siphon ring to complete the laser destructive cutting. Step 6: Dismantle the active structure and driven structure of the drive unit; Step 7: Install the tool for removing the inner ring of the drain ring: initially insert the inner ring removal claw into the cut gap of the drain ring, adjust the position appropriately, lock the two halves of the inner ring removal lifting rod clamp, and then pre-tighten and lock the clamp with bolts so that the inner ring removal claw grips the inner ring of the drain ring tightly. Step 8: Pull out the inner ring of the drain ring: After rotating the drain ring inner ring removal tool to a suitable operating position, pull the inner ring removal lever upwards to remove the drain ring inner ring. Step 9: Remove the inner ring of the drain ring and take out the tool; Step 10: Install the outer ring removal tool for the drain ring: Install the PTFE pad and clamp at a suitable height according to the height of the outer ring removal claw. Assemble the upper groove of the outer ring removal claw with the lower protrusion of the clamp. Assemble the upper protrusion of the anti-detachment pad with the middle groove of the outer ring removal claw. Adjust the position of the outer ring removal claw until its lower protruding cylinder is inserted into the drain hole of the outer ring. Adjust the position of the anti-detachment pad so that its lower protrusion corresponds to the protruding cylinder of the outer ring removal claw. Install the outer ring removal lifting rod to a suitable operating position and tighten it. Step 11: Pull out the inner ring of the drain ring: After rotating the outer ring removal lever to a suitable operating position, pull the outer ring removal lever upward to remove the outer ring of the drain ring; Step 12: Remove the tool for removing the outer ring of the drain ring, thus completing the entire drain ring removal process.

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