Valve clack pressure plate dismounting device and method

Abstract

The application belongs to the technical field of nuclear power maintenance and relates to a valve clack pressing plate dismounting device which comprises a gripping mechanism, a lifting mechanism and an anti-dropping structure. The gripping mechanism comprises a plurality of gripping claws distributed in the circumferential direction, each gripping claw is used for penetrating through a bolt hole of the valve clack pressing plate and extending to the lower side of the valve clack pressing plate to hook the valve clack pressing plate from the lower side; the lifting mechanism is connected with the gripping mechanism and is used for applying upward lifting force to the gripping mechanism to vertically take out the valve clack pressing plate from the valve core; the anti-dropping structure is arranged on the gripping mechanism and has a locking state and an unlocking state. When the gripping mechanism extends into the bolt hole of the valve clack pressing plate and relatively rotates relative to the valve clack pressing plate, the anti-dropping structure is switched from the unlocking state to the locking state to limit the relative movement of the gripping mechanism and the valve clack pressing plate and prevent the gripping mechanism from being loosened from the valve clack pressing plate. The application realizes the safe dismounting of the valve clack pressing plate in the vertical state of the valve core, does not need to dump the valve core and eliminates the risk of personnel injury and equipment bumping and scratching.

Description

Technical Field

[0001] This application belongs to the field of nuclear power plant maintenance technology, and more specifically, it relates to a valve disc pressure plate disassembly and assembly device and disassembly and assembly method. Background Technology

[0002] Nuclear power, as a crucial component of clean energy, occupies a key position in the global energy structure. The safety and stability of nuclear power plant operations are paramount; even minor malfunctions can lead to serious consequences, threatening environmental safety and public health. In the GSS system, large-diameter pilot-operated safety valves are core nuclear-grade equipment ensuring system pressure safety and preventing overpressure operation. Their sealing performance, operational accuracy, and coaxiality directly determine the system's operational reliability. The disassembly and reassembly of the valve disc pressure plate are the most precise and risky procedures during safety valve maintenance.

[0003] During routine maintenance of GSS pilot-operated safety valves, the valve core assembly must be kept vertical, with no operating clearance above the valve disc pressure plate. Furthermore, the pressure plate is heavy and has low frictional resistance at its contact surface, making it impossible for manual removal, lifting, or prying off from above. Therefore, there is an urgent need for a dedicated device that allows for safe installation and removal of the valve disc pressure plate from above while the valve core is vertical. Summary of the Invention

[0004] The purpose of this application is to provide a valve disc pressure plate disassembly and assembly device and disassembly and assembly method, which aims to solve the problem that the valve disc pressure plate cannot be safely disassembled and assembled in a vertical state.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: A valve disc pressure plate disassembly and assembly device is provided, comprising: a gripping mechanism including a plurality of gripping claws distributed circumferentially, each of the gripping claws being used to pass through bolt holes of the valve disc pressure plate and extend to the underside of the valve disc pressure plate to hook the valve disc pressure plate from below; A lifting mechanism, connected to the gripping mechanism, is used to apply an upward lifting force to the gripping mechanism to vertically remove the valve disc pressure plate from the valve core; and An anti-detachment structure is provided on the gripping mechanism, and the anti-detachment structure has a locked state and an unlocked state; When the gripping mechanism extends into the bolt hole of the valve disc pressure plate, relative rotation can occur between the gripping mechanism and the valve disc pressure plate, so that the anti-detachment structure can switch from the unlocked state to the locked state, restricting the relative movement between the gripping mechanism and the valve disc pressure plate, and preventing the gripping mechanism from detaching from the valve disc pressure plate.

[0006] In some embodiments, there are three gripping claws, which are evenly distributed circumferentially, and each gripping claw is used to hook onto the lower edge of the valve disc pressure plate.

[0007] In some embodiments, the gripping mechanism further includes: The lifting force column is positioned above each of the gripping claws and connected to each of the gripping claws.

[0008] In some embodiments, the lifting mechanism includes: A lifting rod, one end of which is connected to the gripping mechanism; and A handle is connected to the end of the lifting rod furthest from the gripping mechanism, for the operator to hold and apply an upward lifting force.

[0009] In some embodiments, the handle has an arc-shaped structure, and the number of lifting rods is three, with the three lifting rods evenly spaced along the arc surface of the handle.

[0010] In some embodiments, the anti-detachment structure is an eccentric limiting block, which is movably mounted on the lifting rod, and there is a gap between the eccentric limiting block and the lifting rod so that the eccentric limiting block can swing freely relative to the lifting rod.

[0011] In some embodiments, a limiting portion is provided on one side of the eccentric limiting block, which can abut against the upper surface of the valve disc pressure plate to limit the falling depth of the eccentric limiting block.

[0012] In some embodiments, the valve disc pressure plate disassembly and assembly device further includes: A pre-compression mechanism is used to apply downward pre-pressure to the valve disc pressure plate during reinstallation to compress the sealing ring.

[0013] In some embodiments, the pre-compression mechanism includes: An upper pressure plate is positioned above the valve disc pressure plate; A lower pressure plate, located below the valve disc pressure plate, is used to support the valve core; and A drive assembly, connected to the upper pressure plate, is used to apply a downward driving force to the upper pressure plate to drive the upper pressure plate to move toward the lower pressure plate.

[0014] In some embodiments, the driving component includes: A lead screw, one end of which is connected to the lower pressure plate, and the other end of which passes through the upper pressure plate and extends upward; and The first nut is threaded to one end of the lead screw that extends out of the upper pressure plate and is used to connect to a torque wrench.

[0015] In some embodiments, the pre-compression mechanism further includes: A support member, disposed below the lower pressure plate, is used to support the lower pressure plate; and The second nut is threaded to one end of the lead screw that extends out of the lower pressure plate and is used to connect to a torque wrench.

[0016] In some embodiments, the upper pressure plate has a plurality of mounting holes, which correspond to the bolt holes of the valve disc pressure plate.

[0017] In some embodiments, the upper pressure plate is provided with a plurality of measuring holes, each of which is used for a measuring tool to be inserted and to measure the compression of the sealing ring.

[0018] This application embodiment also provides a method for disassembling and assembling a valve disc pressure plate, using the valve disc pressure plate disassembly and assembly device described above, including the following steps: Removal steps: The gripping claw of the gripping mechanism passes through the bolt hole of the valve disc pressure plate and extends to the bottom of the valve disc pressure plate; The valve disc pressure plate is rotated to a preset angle relative to the gripping mechanism, so that the bolt hole of the valve disc pressure plate is misaligned with the corresponding threaded hole below, and the anti-disengagement structure is switched from the unlocked state to the locked state, so as to restrict the relative movement between the gripping mechanism and the valve disc pressure plate; The valve disc pressure plate is vertically removed from the valve core by applying an upward lifting force to the gripping mechanism through the lifting mechanism. Insertion steps: The removed valve disc pressure plate is vertically inserted into the valve core through the gripping mechanism; Rotate the valve disc pressure plate in the opposite direction relative to the gripping mechanism to realign the bolt hole of the valve disc pressure plate with the corresponding threaded hole below, and switch the anti-disengagement structure from the locked state to the unlocked state. Pull the gripping mechanism upwards to disengage the gripping claw from the bolt hole of the valve disc pressure plate.

[0019] The beneficial effects of the valve disc pressure plate disassembly and assembly device provided in this application are as follows: When disassembling the valve disc pressure plate, the gripping claw of the gripping mechanism first passes through the bolt hole of the valve disc pressure plate from above and extends to the bottom of the valve disc pressure plate. Then, the valve disc pressure plate is rotated relative to the gripping mechanism to a preset angle, so that the gripping mechanism and the valve disc pressure plate are misaligned. The bent part of the gripping claw then engages with the lower edge of the pressure plate. At the same time, the anti-detachment structure switches from the unlocked state to the locked state to restrict the relative movement between the gripping mechanism and the valve disc pressure plate. Finally, the valve disc pressure plate can be vertically removed from the valve core by lifting it upwards using the lifting mechanism. The entire disassembly process is completed in the vertical state of the valve core, eliminating the need to tilt the heavy valve core assembly. This fundamentally eliminates the risks of personnel injury, crushing injury, and equipment collision, scratches, and coaxiality misalignment. At the same time, the anti-detachment structure provides mechanical anti-detachment protection to ensure that the heavy pressure plate does not slip or fall off during the lifting process, greatly improving the safety and reliability of maintenance operations. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the connection between the valve disc pressure plate disassembly and assembly device and the valve disc pressure plate provided in the embodiments of this application; Figure 2 for Figure 1 The diagram shows the exploded structure of the valve disc pressure plate disassembly and assembly device connected to the valve disc pressure plate. Figure 3 for Figure 1 The diagram shows a top view of the connection between the valve disc pressure plate disassembly / assembly device and the valve disc pressure plate. Figure 4 This is a schematic diagram of the cross-sectional structure along line AA in section 3; Figure 5 for Figure 4 A magnified schematic diagram of the local structure; Figure 6 for Figure 5 A partially enlarged structural diagram of part A in the middle; Figure 7 for Figure 1 The diagram shows the structure in which the eccentric limiting block and the pressure plate are locked together. Figure 8 for Figure 1 Schematic diagram of the gripping mechanism and lifting rod; Figure 9 for Figure 1 A schematic diagram of the middle handle; Figure 10 for Figure 1 A schematic diagram of the anti-hair loss structure; Figure 11 This is a schematic diagram of the pre-compression mechanism provided in the embodiments of this application; Figure 12 A top view of the preloading mechanism provided in the embodiments of this application; Figure 13 This is a schematic diagram of the upper pressure plate of the pre-compression mechanism provided in the embodiments of this application; Figure 14 A schematic diagram illustrating the steps of the valve disc pressure plate disassembly and assembly method provided in the embodiments of this application.

[0022] The following are the labeling elements in the figure: 10-Grasping mechanism; 11-Grasping claw; 12-Lifting force-bearing column; 20 - Lifting mechanism; 21 - Lifting rod; 211 - Axis of the lifting rod; 22 - Handle; 30 - Anti-detachment structure; 31 - Eccentric limiting block; 311 - Axis of the eccentric limiting block; 312 - Axis of the eccentric hole; 32 - Limiting part; 40 - Preload mechanism; 41 - Upper pressure plate; 411 - Mounting hole; 412 - Measuring hole; 42 - Lower pressure plate; 43 - Drive assembly; 431 - Lead screw; 432 - First nut; 44 - Support member; 45 - Second nut; 100-Valve disc pressure plate; 101-Sealing ring; 102-Valve core; 103-Bolt hole; 104-Threaded hole; 105-Limit groove; 1051-Axis of the limit groove; 200-torque wrench; 300 - Measuring tools. Detailed Implementation

[0023] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0024] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0025] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, "multiple sets" means two or more sets, "multiple pieces" means two or more pieces, and "several" means one or more, unless otherwise explicitly specified.

[0027] Nuclear power, as a crucial component of clean energy, occupies a key position in the global energy structure. The safety and stability of nuclear power plant operations are paramount; even minor malfunctions can lead to serious consequences, threatening environmental safety and public health. In the GSS system, large-diameter pilot-operated safety valves are core nuclear-grade equipment ensuring system pressure safety and preventing overpressure operation. Their sealing performance, operational accuracy, and coaxiality directly determine the system's operational reliability. The disassembly and reassembly of the valve disc pressure plate are the most precise and risky procedures during safety valve maintenance.

[0028] During routine maintenance of the GSS pilot-operated safety valve, the valve core assembly must be kept vertical, with no operating clearance above the valve disc pressure plate. At the same time, the pressure plate has a large self-weight and low frictional resistance on the mating surface, making it impossible for manual personnel to directly lift, pull, or remove it from above.

[0029] Traditional maintenance requires tilting the entire heavy valve core assembly to remove the valve disc pressure plate from the side. This is not only extremely difficult, but also poses a significant risk of injury from falling objects and crushing injuries from rolling. Furthermore, the tilting process can easily damage the valve core guide components, scratch the sealing surface, and cause misalignment, directly compromising the safety valve's sealing performance and operational accuracy. During valve disc pressure plate reinstallation, the extremely small assembly gaps and the plate's weight make it highly susceptible to hand injuries from being caught or crushed, posing a serious personal safety hazard.

[0030] Based on this, this application provides a valve disc pressure plate disassembly and assembly device and method for use in nuclear power plant safety valves for disassembling and assembling valve disc pressure plates, in order to solve the above-mentioned problems.

[0031] Please refer to the following: Figures 1 to 14 The valve disc pressure plate disassembly and assembly device and disassembly and assembly method provided in this application embodiment are applicable to, but not limited to, disassembling and assembling the valve disc pressure plate 100 in the maintenance of pilot-operated safety valves in nuclear power plants.

[0032] In the embodiments of this application, such as Figures 1 to 5 As shown, the valve disc pressure plate disassembly and assembly device includes a gripping mechanism 10, a lifting mechanism 20, and an anti-detachment structure 30. The gripping mechanism 10 includes a plurality of gripping claws 11 distributed circumferentially. Each gripping claw 11 is used to pass through the bolt holes 103 of the valve disc pressure plate 100 and extend to the bottom of the valve disc pressure plate 100 to hook the valve disc pressure plate 100 from below. The lifting mechanism 20 is connected to the gripping mechanism 10 and is used to apply an upward lifting force to the gripping mechanism 10 to vertically remove the valve disc pressure plate 100 from the valve core 102. The anti-detachment structure 30 is disposed on the gripping mechanism 10 and has a locked state and an unlocked state.

[0033] Understandably, since the valve core assembly of the GSS pilot-operated safety valve must be kept vertically upright during routine maintenance, there is no operating clearance above the valve disc pressure plate 100. Furthermore, the pressure plate is heavy and has low frictional resistance at the contact surface, making it impossible for manual lifting, pulling, or removal from above. Therefore, the gripping mechanism 10 employs multiple circumferentially distributed gripping claws 11. Each gripping claw 11 can pass through the bolt holes 103 of the valve disc pressure plate 100 from above and extend below it, thus hooking the valve disc pressure plate 100 from below. This achieves gapless gripping in a vertical position, eliminating the need to tilt the heavy valve core assembly to complete the gripping and positioning before disassembly. This fundamentally eliminates the risks of personnel injury, crushing injuries, and damage to the valve core 102 guide components, scratches on the sealing surface, and coaxiality misalignment caused by tilting the valve core 102.

[0034] For example, three gripping claws 11 may be provided, which are evenly distributed circumferentially. Each gripping claw 11 is bent at a right angle and used to hook onto the lower edge of the valve disc pressure plate 100. The even distribution of the three gripping claws 11 circumferentially can form a stable and uniform three-point force, which can meet the gripping requirements of the heavy valve disc pressure plate 100 and avoid tilting or slippage caused by unilateral force. The size of each gripping claw 11 is adapted to the bolt hole 103 of the valve disc pressure plate 100 so that the gripping claw 11 can pass smoothly through the bolt hole 103.

[0035] In this embodiment, the lifting mechanism 20 is connected to the gripping mechanism 10 and is used to apply an upward lifting force to the gripping mechanism 10. An anti-detachment structure 30 is disposed on the gripping mechanism 10 and has a locked state and an unlocked state. When the gripping mechanism 10 extends into the bolt hole 103 of the valve disc pressure plate 100, relative rotation can occur between the gripping mechanism 10 and the valve disc pressure plate 100, causing the anti-detachment structure 30 to switch from the unlocked state to the locked state, restricting the relative movement between the gripping mechanism 10 and the valve disc pressure plate 100, and preventing the gripping mechanism 10 from detaching from the valve disc pressure plate 100. The angle of relative rotation between the gripping mechanism 10 and the valve disc pressure plate 100 is 1° to 2°. After the gripping mechanism 10 extends into the bolt hole 103, the operator rotates the valve disc pressure plate 100 approximately 1° along the horizontal plane, causing the bolt hole 103 of the valve disc pressure plate 100 to form a misaligned hole with the corresponding threaded hole 104 of the valve core 102 below. At this time, the right-angled bend of the gripping claw 11 engages below the valve disc pressure plate 100, achieving hooking. Of course, the gripping mechanism 10 can also be rotated, as long as relative rotation occurs between the gripping mechanism 10 and the valve disc pressure plate 100.

[0036] When the gripping mechanism 10 extends into the bolt hole 103 of the valve disc pressure plate 100 and rotates relative to the valve disc pressure plate 100 to a preset angle, the anti-detachment structure 30 switches from the unlocked state to the locked state. After gripping in place, mechanical anti-detachment can be achieved, preventing the gripping claw 11 from slipping, loosening, or the equipment from falling during the lifting process, thus achieving dual safety protection for personnel and equipment.

[0037] Thus, in the valve disc pressure plate disassembly and assembly device provided in this application embodiment, when disassembling the valve disc pressure plate 100, the gripping claw 11 of the gripping mechanism 10 first passes through the bolt hole 103 of the valve disc pressure plate 100 from above and extends to the bottom of the valve disc pressure plate 100. Then, the valve disc pressure plate 100 is rotated relative to the gripping mechanism 10, so that the gripping mechanism 10 and the valve disc pressure plate 100 are misaligned. The bent part of the gripping claw 11 is then engaged in the lower edge of the valve disc pressure plate 100. At the same time, the anti-detachment structure 30 switches from the unlocked state to the locked state to restrict the relative movement between the gripping mechanism 10 and the valve disc pressure plate 100. Finally, the valve disc pressure plate 100 can be vertically removed from the valve core 102 by lifting it upward by the lifting mechanism 20. The entire disassembly process is completed with the valve core 102 in a vertical position, eliminating the need to tilt the heavy valve core assembly. This fundamentally eliminates the risks of personnel injury from impacts and crushing, as well as equipment collisions, scratches, and coaxiality misalignment. At the same time, the anti-detachment structure 30 provides mechanical anti-detachment protection, ensuring that the heavy pressure plate does not slip or fall off during the lifting process, greatly improving the safety and reliability of maintenance operations.

[0038] In some embodiments, such as Figure 2 and Figure 3As shown, there are three gripping claws 11, which are evenly distributed circumferentially. Each gripping claw 11 is used to hook onto the lower edge of the valve disc pressure plate 100. The three gripping claws 11 are evenly distributed circumferentially to form a three-point balanced force structure, which ensures that the valve disc pressure plate 100 is subjected to uniform force during the lifting process, avoiding tilting or shaking of the pressure plate due to force on one or both sides, and ensuring that the heavy pressure plate remains horizontal and stable during the vertical removal process, without uneven loading or twisting.

[0039] Understandably, due to the large weight of the valve disc pressure plate 100 and the low frictional resistance of its contact surface, using three evenly distributed circumferential gripping claws 11 to hook the valve disc pressure plate 100 from below can evenly distribute the entire weight of the valve disc pressure plate 100 to three stress points, avoiding stress concentration. Thus, through the three evenly distributed circumferential gripping claws 11, the valve disc pressure plate 100 is stably hooked from below, ensuring balanced force and smooth movement of the heavy pressure plate during lifting, avoiding equipment damage caused by uneven loading, and effectively guaranteeing maintenance quality and operational safety.

[0040] It should be noted that in this embodiment, there are two gripping mechanisms 10 and two lifting mechanisms 20. The two gripping mechanisms 10 are symmetrically arranged on both sides of the valve disc pressure plate 100 about the axis of the pressure plate 100, and the two lifting mechanisms 20 are connected to the two gripping mechanisms 10 in a one-to-one correspondence. The gripping claws 11 of the two gripping mechanisms 10 pass through the bolt holes 103 on both sides of the valve disc pressure plate 100 and hook onto the lower edge of the valve disc pressure plate 100. The two lifting mechanisms 20 apply an upward lifting force simultaneously, so that both sides of the valve disc pressure plate 100 are subjected to force and lifted evenly.

[0041] Understandably, since the valve disc pressure plate 100 has a large self-weight and an overall circular symmetrical structure, the two gripping mechanisms 10 are symmetrically arranged on both sides of the pressure plate. This can ensure that the pressure plate is subjected to balanced force on both sides during the lifting process, avoiding the pressure plate tilting, jamming or uneven load caused by lifting on one side. At the same time, the two-point symmetrical gripping, together with the three gripping claws 11 on each gripping mechanism, forms a six-point uniform force, which further improves the stability and reliability of the gripping.

[0042] In some embodiments, such as Figures 1 to 4 As shown, the gripping mechanism 10 also includes a lifting force-bearing column 12, which is positioned above and connected to each gripping claw 11. The lifting force-bearing column 12 serves as the main load-bearing column of the device, located above the gripping claws 11 and connecting them into a single unit. The weight of the valve disc pressure plate 100 borne by each gripping claw 11 is transmitted to the lifting force-bearing column 12 through the gripping claw 11 itself, and then upwards from the lifting force-bearing column 12 to the lifting mechanism 20. Finally, the operator applies force through the lifting mechanism 20 to complete the lifting operation.

[0043] Understandably, due to the significant weight of the valve disc pressure plate 100, the lifting force-bearing column 12, serving as the intermediate force-transmitting component connecting the gripper 11 and the lifting mechanism 20, bears the entire weight of the valve disc pressure plate 100. During the lifting process, all loads are transmitted upwards through the lifting force-bearing column 12. Therefore, the lifting force-bearing column 12 is made of a high-rigidity alloy material, possessing sufficient rigidity and yield strength to ensure that the overall structure does not deform or yield during lifting, providing a stable load-bearing body for the operator and enabling the safe lifting of the heavy valve disc pressure plate 100. Simultaneously, the surface of the lifting force-bearing column 12 can be covered with a non-slip, soft, wear-resistant layer. When bearing the weight of the pressure plate and directly contacting the lower surface of the valve disc pressure plate 100, this layer effectively protects the lower surface of the valve disc pressure plate 100, preventing scratches or indentations and ensuring the integrity of the sealing surface.

[0044] In this way, by lifting the force-bearing column 12 to connect each gripper 11 into one unit, the synchronous action of each gripper 11 is realized, and the entire weight of the valve disc pressure plate 100 is concentrated and transferred to the lifting mechanism 20, ensuring a clear force transmission path and reliable structural bearing during the lifting process, thereby achieving stable and safe lifting of the heavy pressure plate.

[0045] It should be noted that there are three lifting force-bearing columns 12, and each lifting force-bearing column 12 is provided with a gripping claw 11 at one end. That is, a gripping claw 11 is fixedly connected to the lower end of each lifting force-bearing column 12, and the three lifting force-bearing columns 12 are connected to the three gripping claws 11 in a one-to-one correspondence. Each lifting force-bearing column 12 acts as an independent load-bearing component, and transmits the local load borne by the corresponding gripping claw 11 upwards. The three lifting force-bearing columns 12 jointly bear the entire weight of the valve disc pressure plate 100, and the extension direction of the gripping claw 11 is perpendicular to the axis of the lifting force-bearing column 12.

[0046] Understandably, due to the large self-weight of the valve disc pressure plate 100 and its three-point gripping structure, each gripping claw 11 bears the local load at its corresponding position on the valve disc pressure plate 100. The load borne by each gripping claw 11 is independently transmitted upward through the corresponding lifting force-bearing column 12. The three lifting force-bearing columns 12 are evenly distributed circumferentially and are simultaneously stressed during the lifting process, distributing the weight of the pressure plate to three independent load-bearing paths, avoiding load concentration on a single component, and thus ensuring the load-bearing reliability of the overall structure during the lifting process.

[0047] In some embodiments, such as Figure 2As shown, the lifting mechanism 20 includes a lifting rod 21 and a handle 22. One end of the lifting rod 21 is connected to the gripping mechanism 10. The handle 22 is connected to the end of the lifting rod 21 away from the gripping mechanism 10, and is used for the operator to hold and apply an upward lifting force. The lifting rod 21 serves as a force transmission component between the gripping mechanism 10 and the handle 22. One end of the lifting rod 21 is connected to the gripping mechanism 10, and the other end is connected to the handle 22. The operator applies upward force by holding the handle 22, and the lifting force is transmitted through the handle 22 to the lifting rod 21, and then from the lifting rod 21 to the gripping mechanism 10, ultimately driving the gripping claw 11 to lift the valve disc pressure plate 100 upward.

[0048] Understandably, given the significant weight of the valve disc pressure plate 100 and its need for seamless vertical removal from above, the lifting rod 21 employs a high-strength rigid round rod structure. This structure possesses sufficient rigidity and tensile strength to uniformly and stably transmit the lifting force from the handle 22 to the gripping mechanism 10, ensuring a clear force transmission path and reliable structural support during the lifting process. A limiting mechanism (not shown in the figure) can be installed at the end of the lifting rod 21 connected to the handle 22 to limit the axial displacement of the lifting rod 21 relative to the handle 22, preventing it from detaching from the handle 22 during lifting. Simultaneously, the shaft holes on the lifting rod 21 and handle 22 are coaxially arranged without any wobbling gaps, avoiding wobbling and uneven loading caused by gaps during lifting. This ensures that the lifting force applied by the operator is precisely transmitted vertically to the valve disc pressure plate 100, guaranteeing no uneven loading or twisting during the lifting process and enabling the valve disc pressure plate 100 to be removed vertically and smoothly.

[0049] In this embodiment, the first third of the lifting rod 21, near the gripping mechanism 10, can be milled into a flat surface to provide space for the threaded hole 104 when passing through the bolt hole 103 of the valve disc pressure plate 100, preventing interference with the wall of the bolt hole 103 during descent. Simultaneously, a threaded hole 104 can be provided at the front end of the lifting rod 21 for detachable connection with the lifting force-bearing column 12.

[0050] Thus, through the cooperation of the lifting rod 21 and the handle 22, the operator holds the handle 22 and exerts upward force. The lifting force is vertically transmitted to the gripping mechanism 10 through the lifting rod 21. Single-person operation can be achieved without the need for other auxiliary tools, reducing the difficulty of operation and labor intensity. At the same time, the zero-wobble gap between the lifting rod 21 and the handle 22 ensures that the lifting force is accurately transmitted in the vertical direction, avoiding uneven load and twisting of the pressure plate during the lifting process, and ensuring that the heavy pressure plate is safely and stably removed.

[0051] In some embodiments, such as Figures 5 to 9As shown, the handle 22 has an arc-shaped structure, and there are three lifting rods 21. The three lifting rods 21 are evenly spaced along the arc surface of the handle 22. The handle 22 adopts an ergonomic arc-shaped design, and its width is suitable for one-handed grip. The surface of the handle 22 can be coated with an arc-shaped anti-slip coating so that the operator can hold the handle 22 stably and apply upward force without slipping.

[0052] Understandably, since the valve disc pressure plate 100 is heavy and needs to be removed vertically, the arc-shaped handle 22 provides the operator with a comfortable and stable point of force application, making the force application more natural and the grip more secure. The three lifting rods 21 are evenly spaced along the arc surface of the handle 22, for example, the angle between two adjacent lifting rods 21 and the arc center of the handle 22 is 30°. They are arranged one-to-one with the three gripping claws 11 and the three lifting force-bearing columns 12, so that the lifting force applied by the operator through the handle 22 can be evenly and synchronously transmitted to each gripping claw 11 through the three lifting rods 21. This ensures that the three gripping claws 11 move synchronously and receive balanced force during the lifting process, avoiding the pressure plate tilting, jamming, or uneven load caused by uneven force on each gripping claw 11.

[0053] In this way, by cooperating with the arc-shaped handle 22 and the three evenly spaced lifting rods 21, the operator can hold the handle 22 with one hand and transmit the lifting force to each gripper 11 synchronously through the three lifting rods 21. This allows a single person to complete the lifting, removal and positioning of the valve disc pressure plate 100 without the need for multiple people to cooperate, reducing the difficulty of operation and labor intensity, while ensuring that the pressure plate is subjected to balanced force and moves smoothly during the lifting process.

[0054] In some embodiments, such as Figure 2 , Figure 4 , Figure 5 and Figure 10 As shown, the anti-detachment structure 30 is an eccentric limiting block 31, which is movably mounted on the lifting rod 21. There is a gap between the eccentric limiting block 31 and the lifting rod 21, allowing the eccentric limiting block 31 to swing freely relative to the lifting rod 21. The eccentric limiting block 31 is a gravity-driven eccentric movable block that can swing freely around its axis, with its center of gravity deviating from the rotation axis. When the gripping mechanism 10 extends into the bolt hole 103 of the valve disc pressure plate 100 and rotates relative to the valve disc pressure plate 100 to a preset angle, the eccentric limiting block 31 rotates synchronously with the gripping mechanism 10 to a position corresponding to the limiting groove 105 of the valve disc pressure plate 100. At this time, due to the gap between the eccentric limiting block 31 and the lifting rod 21, and its center of gravity deviating from the rotation axis, the eccentric limiting block 31 automatically swings and falls under the action of gravity, locking into the limiting groove 105 of the valve disc pressure plate 100, thus switching the anti-detachment structure 30 from the unlocked state to the locked state.

[0055] Specifically, please refer to Figure 6The lifting rod 21 has an axis 211 extending along its length. The eccentric limiting block 31 has an axis 311 and an eccentric hole 312 with an axis 3121. The valve disc pressure plate 100 has a limiting groove 105 with an axis 1051.

[0056] The locking process is as follows, see below. Figures 4 to 6 In the initial state, before the gripping mechanism 10 has fully gripped the valve disc, the eccentric limiting block 31 is located above the valve disc pressure plate 100. At this time, the axis 3121 of the eccentric hole, the axis 211 of the lifting rod, and the axis 1051 of the limiting groove 105 are collinear. When the operator rotates the valve disc pressure plate 100 relative to the gripping mechanism 10 to a preset angle, see [the relevant documentation]. Figure 3 and Figure 5 The direction F shown is the direction of the rotary valve disc pressure plate 100, further combined with Figure 7 The gripper 11 engages with the lower edge of the valve disc pressure plate 100. Simultaneously, due to the gap between the eccentric limiting block 31 and the lifting rod 21, the eccentric limiting block 31 falls with gravity. At this time, the axis 311 of the eccentric limiting block is collinear with the axis 1051 of the limiting groove. The eccentric limiting block 31 engages with the limiting groove 105, causing the anti-detachment structure 30 to switch from the unlocked state to the locked state.

[0057] When the device needs to be disassembled, the operator first pulls the lifting rod 21 upward to disengage the eccentric limit block 31 from the limit groove 105, and then rotates the valve disc pressure plate 100 in the opposite direction to reset it, so that the axis 3121 of the eccentric hole, the axis 211 of the lifting rod, and the axis 1051 of the limit groove are collinear again. At this time, the eccentric limit block 31 abuts against the upper surface of the valve disc pressure plate 100, and the anti-disengagement structure 30 switches from the locked state to the unlocked state, so that the tool can be quickly removed.

[0058] Understandably, given the significant weight of the valve disc pressure plate 100, and the potential for relative displacement between the gripper 11 and the valve disc pressure plate 100 due to vibration and swaying during lifting, relying solely on the gripper 11 for bottom hooking poses a risk of the gripper 11 slipping off the lower edge of the valve disc pressure plate 100. By movably installing an eccentric limiting block 31 on the lifting rod 21, maintaining a gap between it and the lifting rod 21, the eccentric limiting block 31 can automatically fall under its own weight after the gripper 11 has hooked into position, locking without manual intervention. The eccentric distance L1 of the eccentric limiting block 31 matches the rotation angle of the valve disc pressure plate 100, ensuring that after rotation, the eccentric limiting block 31 accurately aligns with the limiting groove 105 and reliably engages. When disassembly is required, the valve disc pressure plate 100 is rotated in the opposite direction to reset, and the eccentric limiting block 31 automatically disengages from the limiting groove 105 under gravity, allowing for quick tool removal.

[0059] Thus, through the clearance fit between the eccentric limiting block 31, which is movably installed on the lifting rod 21, and the lifting rod 21, the eccentric limiting block 31 can automatically fall down under gravity after being gripped in place, clamping the limiting groove 105 of the valve disc pressure plate 100, forming a mechanical anti-detachment structure 30. This prevents the gripping claw 11 from loosening and the pressure plate from slipping and falling during the lifting process, achieving dual safety protection for personnel and equipment. At the same time, it can be automatically unlocked by rotating in the opposite direction, without affecting the quick disassembly of the device.

[0060] In some embodiments, such as Figure 2 , Figure 4 , Figure 5 and Figure 10 As shown, a limiting part 32 is provided on one side of the eccentric limiting block 31. The limiting part 32 can abut against the upper surface of the valve disc pressure plate 100 to limit the falling depth of the eccentric limiting block 31. The limiting part 32 is located on the left side of the eccentric limiting block 31. When the eccentric limiting block 31 automatically falls and enters the limiting groove 105 of the valve disc pressure plate 100 under the action of gravity, the limiting part 32 moves downward synchronously with the eccentric limiting block 31 and abuts against the upper surface of the valve disc pressure plate 100 when the eccentric limiting block 31 falls to a preset depth, thereby preventing the eccentric limiting block 31 from falling further and limiting the insertion depth of the eccentric limiting block 31 within a preset range.

[0061] Understandably, since the eccentric limiting block 31 falls automatically under gravity, without a structure to limit its falling depth, the eccentric limiting block 31 may fall excessively and fail to smoothly disengage from the limiting groove 105 during lifting, causing jamming when disassembling the tool. By providing a limiting part 32 on one side of the eccentric limiting block 31, and ensuring that the limiting part 32 abuts against the upper surface of the valve disc pressure plate 100 when the eccentric limiting block 31 falls to a preset depth, the falling depth of the eccentric limiting block 31 can be limited to a range that allows it to reliably engage with the limiting groove 105 to achieve the anti-disengagement function, while also allowing it to smoothly disengage after the pressure plate is rotated in the opposite direction to reset, thus ensuring the locking reliability and disassembly convenience of the device.

[0062] Thus, by setting a limiting part 32 on the eccentric limiting block 31, the limiting part 32 abuts against the upper surface of the valve disc pressure plate 100 to limit the falling depth of the eccentric limiting block 31, avoiding the eccentric limiting block 31 from falling too far and being unable to get out of the limiting groove 105. This ensures the reliability of the anti-detachment structure 30 during the lifting process and facilitates quick disassembly of tools after the pressure plate is removed.

[0063] In some embodiments, such as Figures 11 to 13As shown, the pre-compression mechanism 40 includes an upper pressure plate 41, a lower pressure plate 42, and a drive assembly 43; the upper pressure plate 41 is disposed above the valve disc pressure plate 100; the lower pressure plate 42 is disposed below the valve disc pressure plate 100 and is used to support the valve core 102; the drive assembly 43 is connected to the upper pressure plate 41 and is used to apply a downward driving force to the upper pressure plate 41 to drive the upper pressure plate 41 to move toward the lower pressure plate 42. The upper pressure plate 41 serves as the upper force-bearing platform for applying pressure and is coaxially set with the lower pressure plate 42. The lower pressure plate 42 serves as a positioning support base plate and is precisely matched with the upper end face of the main valve core 102 and the shape of the valve disc pressure plate 100. It is used to support the valve core 102 and provide a stable support reference surface. The drive assembly 43 is connected between the upper pressure plate 41 and the lower pressure plate 42. By applying torque to the drive assembly 43, a downward driving force is generated, which is transmitted to the valve disc pressure plate 100 through the upper pressure plate 41, and the valve disc pressure plate 100 is pressed down smoothly as a whole.

[0064] Understandably, due to the extremely high hardness of the sealing ring 101, it must be forcibly compressed to a steel-to-steel fit during reinstallation. However, conventional bolt tightening methods cannot achieve the required fit using standard torque. Through the coaxial cooperation of the upper pressure plate 41 and the lower pressure plate 42, when the upper pressure plate 41 moves towards the lower pressure plate 42 under the drive of the drive assembly 43, it ensures that the valve disc pressure plate 100 and the valve core 102 remain coaxial during pre-compression, preventing misalignment and jamming. The downward driving force generated by the drive assembly 43 is evenly distributed to the surface of the valve disc pressure plate 100 via the upper pressure plate 41, allowing the valve disc pressure plate 100 to press down smoothly as a whole, reliably compressing the hard sealing ring 101 to the designed position.

[0065] Thus, through the cooperation of the upper pressure plate 41, the lower pressure plate 42, and the drive assembly 43, when the valve disc pressure plate 100 is reinstalled, the drive assembly 43 applies a downward driving force to the upper pressure plate 41, causing the upper pressure plate 41 to move towards the lower pressure plate 42, applying external force to pre-compress the valve disc pressure plate 100. This first forces the hard sealing ring 101 to a steel-to-steel fit, then the original fastening bolts are installed and tightened, and finally the pre-compression mechanism 40 is removed. The entire pre-compression process does not rely on bolt torque to forcibly compress the sealing ring 101, fundamentally protecting the bolts and threads, avoiding equipment damage such as bolt breakage and thread stripping, while ensuring uniform compression and reliable sealing of the sealing ring 101.

[0066] In some embodiments, such as Figure 11As shown, the drive assembly 43 includes a lead screw 431 and a first nut 432. One end of the lead screw 431 is connected to the lower pressure plate 42, and the other end of the lead screw 431 passes through the upper pressure plate 41 and extends upward. The first nut 432 is threadedly connected to the end of the lead screw 431 that extends out of the upper pressure plate 41, and is used to connect with the torque wrench 200. The lead screw 431 is the core force-applying component of the drive assembly 43. Its lower end is connected to the lower pressure plate 42, and its upper end passes through the upper pressure plate 41 and is threadedly engaged with the first nut 432. After the first nut 432 is connected to the torque wrench 200, the operator rotates the first nut 432 through the torque wrench 200. The first nut 432 moves downward along the thread of the lead screw 431, pushing the upper pressure plate 41 toward the lower pressure plate 42.

[0067] Understandably, due to the extremely high hardness of the sealing ring 101, sufficient and uniform pressure is required to compress it to a steel-to-steel fit. Lead screws 431 are evenly arranged (e.g., six) along the circumference of the upper pressure plate 41 and the lower pressure plate 42. Each lead screw 431 rotates synchronously to apply pressure, converting the rotational torque input by the torque wrench 200 into a vertically downward preload. Multiple lead screws 431 are simultaneously stressed, ensuring uniform pressure distribution and enabling the valve disc pressure plate 100 to be pressed down smoothly. The lead screw 431 and nut cooperate smoothly, ensuring that the rotational torque can be smoothly converted into a downward driving force, avoiding torque loss or uneven force application due to excessive frictional resistance. The first nut 432 is located at the end of the lead screw 431 extending from the upper pressure plate 41, allowing the operator to apply torque from above using the torque wrench 200, eliminating the need to operate from the side or bottom of the valve core 102 and reducing operational difficulty.

[0068] Thus, through the threaded engagement of the lead screw 431 and the first nut 432, the rotational torque input by the torque wrench 200 is converted into a vertically downward preload, driving the upper pressure plate 41 to press down smoothly, thereby achieving reliable compression of the sealing ring 101. Multiple lead screws 431 are evenly arranged and simultaneously subjected to force, ensuring that the pressure is evenly distributed along the circumference of the valve disc pressure plate 100, ensuring that the sealing ring 101 is evenly compressed to a steel-to-steel fit state, providing a reliable assembly foundation for subsequent bolt tightening.

[0069] In some embodiments, such as Figure 11 As shown, the pre-compression mechanism 40 also includes a support member 44 and a second nut 45. The support member 44 is located below the lower pressure plate 42 and is used to support the lower pressure plate 42. The second nut 45 is threadedly connected to one end of the lead screw 431 extending out of the lower pressure plate 42 and is used to connect to the torque wrench 200. The support member 44 is located at the bottom of the lower pressure plate 42 and supports the lower pressure plate 42 and the valve core 102 as a whole, leaving operating space at the bottom. The second nut 45 is located at the lower end of the lead screw 431 extending out of the lower pressure plate 42. The operator rotates the second nut 45 through the torque wrench 200, which cooperates with the first nut 432 to achieve bidirectional force application or reverse locking of the sealing ring 101.

[0070] Understandably, due to the extremely limited space between the bottom of the valve core 102 and the mounting base, and the fact that the fastening bolts are located below the valve disc pressure plate 100, the traditional method of installation and tightening the bolts without any operating clearance is extremely difficult. By setting a support member 44 below the lower pressure plate 42, the support member 44 lifts the lower pressure plate 42 and the valve core 102 supported on it upwards, creating sufficient bottom operating space between the bottom of the valve core 102 and the area below the lower pressure plate 42. This facilitates the installation and tightening of the pressure plate bolts by personnel, solving the problem of no operating clearance in the vertical position. At the same time, the support member 44 acts as a bottom support leg, stably supporting the heavy valve core assembly and preventing hard contact from scratching the sealing surface of the valve core 102.

[0071] In this embodiment, the second nut 45 is threadedly connected to one end of the lead screw 431 extending from the lower pressure plate 42. While the first nut 432 applies torque from above to drive the upper pressure plate 41 downwards, the second nut 45 can apply a reverse torque from below, achieving bidirectional force application. Alternatively, the second nut 45 can lock the first nut 432 to prevent loosening. Thus, the support member 44 supports the valve core 102, providing bottom operating space for the operation of the second nut 45, allowing the operator to rotate the second nut 45 from below using the torque wrench 200, achieving flexible force application during the pre-pressing process.

[0072] In this way, the lower pressure plate 42 and valve core 102 are supported as a whole by the support member 44, which not only stably supports the heavy valve core assembly and protects the sealing surface of the valve core 102 from scratches by hard contact, but also leaves enough operating space at the bottom to facilitate the installation and fastening of the pressure plate bolts by the disassembly and assembly personnel. At the same time, it provides operating space for the operation of the second nut 45, solving the problem that the bolts cannot be installed due to the lack of operating clearance in the traditional vertical state.

[0073] In some embodiments, such as Figure 5 , Figures 11 to 13 As shown, the upper pressure plate 41 has multiple mounting holes 411, which correspond to the bolt holes 103 of the valve disc pressure plate 100. The upper pressure plate 41 serves as the upper force-bearing platform for applying pressure. The multiple mounting holes 411 on it are positioned one-to-one with the bolt holes 103 on the valve disc pressure plate 100. When the upper pressure plate 41 compresses the sealing ring 101 to a steel-to-steel fit, the fastening bolts can be directly passed through the mounting holes 411 on the upper pressure plate 41 and into the bolt holes 103 of the valve disc pressure plate 100 for locking. The bolt installation can be completed without removing or moving the upper pressure plate 41 after pre-compression.

[0074] Understandably, since the upper pressure plate 41 covers the valve disc pressure plate 100 during the pre-compression process, if the upper pressure plate 41 does not have a clearance hole corresponding to the bolt hole 103 of the valve disc pressure plate 100, the upper pressure plate 41 needs to be removed before the bolts are installed after the sealing ring 101 is compressed into place. After removing the upper pressure plate 41, the sealing ring 101 may no longer be in a steel-to-steel fit due to elastic recovery, resulting in pre-compression failure. By opening multiple mounting holes 411 on the upper pressure plate 41 corresponding to the bolt holes 103 of the valve disc pressure plate 100, such as 12 holes, after pre-pressurization, the fastening bolts can be directly passed through the mounting holes 411 of the upper pressure plate 41 and inserted into the bolt holes 103 of the valve disc pressure plate 100 and locked. The upper pressure plate 41 maintains pressure on the valve disc pressure plate 100 during the bolt locking process. The upper pressure plate 41 is removed after all bolts are tightened, thereby ensuring that the sealing ring 101 always maintains a steel-to-steel fit during the bolt locking process and avoiding the rebound of the sealing ring 101 caused by the pre-pressurization pull-out force.

[0075] Thus, by opening mounting holes 411 on the upper pressure plate 41 corresponding to the bolt holes 103 of the valve disc pressure plate 100, the upper pressure plate 41 can be pre-pressed in place without removing the upper pressure plate 41, and the fastening bolts can be directly inserted. This ensures that the sealing ring 101 is always in a compressed state during the bolt tightening process, avoiding the problem that the sealing ring 101 will rebound due to the removal of the pre-pressure, thus failing to maintain the steel-to-steel fit. At the same time, it simplifies the operation process and improves the assembly accuracy and efficiency.

[0076] In some embodiments, such as Figures 11 to 13 As shown, the upper pressure plate 41 has multiple measuring holes 412, each of which is used for a measuring tool 300 to be inserted to measure the compression of the sealing ring 101. The measuring holes 412 are evenly distributed around the circumference of the upper pressure plate 41. The operator inserts the measuring tool 300 (such as a vernier caliper, depth gauge, etc.) through the measuring holes 412 to the junction of the valve disc pressure plate 100 and the main valve core 102 to directly measure the compression of the sealing ring 101 during the pre-compression process, in order to determine whether the sealing ring 101 has reached the steel-to-steel bonding state.

[0077] Understandably, the sealing ring 101 needs to be compressed to a steel-to-steel fit to ensure sealing reliability under high-temperature conditions. However, during the pre-compression process, the sealing ring 101 is covered by the upper pressure plate 41, making it impossible to directly observe its compression state. By opening multiple measuring holes 412 on the upper pressure plate 41, for example, setting four measuring points and opening measuring holes 412 on the inner side of the upper pressure plate 41 at the junction of the valve disc pressure plate 100 and the main valve core 102, the operator can insert the measuring tool 300 into the measuring holes 412 at any time during the pre-compression process to measure the compression of the sealing ring 101 in real time. In actual operation, the sealing ring 101 is not installed first; only the valve cover pressure plate is installed. The height of the valve cover pressure plate in the steel-to-steel state is measured with vernier calipers as a reference value. After the sealing ring 101 is installed, the torque is gradually increased during the pre-compression process. The compression amount at the corresponding position is measured through the four measuring holes 412, and the measured values ​​are recorded and compared with the steel-to-steel reference value. Based on the measurement data, it is determined whether the sealing ring 101 has been compressed to the steel-to-steel state. At the same time, the measurement data at the four points can also be used to determine whether the upper pressure plate 41 is tilted. If the measurement data at the four points are consistent, it indicates that the upper pressure plate 41 is in a horizontal state and the pressure distribution is uniform. If the measurement data at a certain position deviates significantly, the deviation can be corrected by adjusting the loading sequence of the corresponding screw 431.

[0078] Thus, by setting multiple measuring holes 412 on the upper pressure plate 41, the operator can measure the compression of the sealing ring 101 in real time and at multiple points during the pre-compression process using the measuring tool 300. Based on the measurement data and the steel-to-steel reference value, the operator can accurately determine whether the sealing ring 101 has been compressed to the steel-to-steel state. At the same time, the operator can determine whether the upper pressure plate 41 is tilted by the consistency of the four-point measurement data, providing data support for adjusting the loading sequence and ensuring that the sealing ring 101 is compressed evenly and the assembly accuracy is controllable.

[0079] In the embodiments of this application, see Figure 14 Furthermore, a method for disassembling and assembling a valve disc pressure plate is provided. This method is implemented using the valve disc pressure plate disassembly and assembly device in any of the above embodiments, and includes the following steps: S1: Pass the gripping claw 11 of the gripping mechanism 10 through the bolt hole 103 of the valve disc pressure plate 100 and extend it to the bottom of the valve disc pressure plate 100.

[0080] Specifically, the valve disc pressure plate 100 is coaxially aligned with the 12 bolt holes 103 of the main valve core 102. Then, the gripping claws 11 of the gripping mechanism 10 are symmetrically arranged so that each gripping claw 11 is precisely inserted into the bolt holes 103 of the valve disc pressure plate 100. The insertion depth is sufficient for the gripping claw 11 to pass through the bolt holes 103 and extend below the valve disc pressure plate 100, entering the lower threaded hole 104. This step, by having the gripping claw 11 extend from above through the bolt holes 103 to below the pressure plate, provides a foundation for subsequent hooking of the pressure plate, avoiding the difficulties of operation from the side or bottom.

[0081] S2: Rotate the valve disc pressure plate 100 relative to the gripping mechanism 10 to a preset angle, so that the bolt hole 103 of the valve disc pressure plate 100 is misaligned with the corresponding threaded hole 104 below, and switch the anti-disengagement structure 30 from the unlocked state to the locked state, so as to restrict the relative movement between the gripping mechanism 10 and the valve disc pressure plate 100.

[0082] Specifically, the valve disc pressure plate 100 is rotated approximately 1° along the horizontal plane, causing the bolt hole 103 of the valve disc pressure plate 100 to align with the corresponding threaded hole 104 below. At this point, the bent portion of the gripper 11 engages with the lower edge of the valve disc pressure plate 100, while the anti-detachment structure 30 aligns with the limiting groove 105 of the valve disc pressure plate 100 and automatically falls into the limiting groove 105 under gravity, switching the anti-detachment structure 30 from the unlocked state to the locked state. This step achieves the hooking of the gripper 11 and the automatic locking of the anti-detachment structure 30 through a slight rotation of the pressure plate, ensuring that the gripper 11 will not slip off from under the pressure plate during the lifting process.

[0083] S3: The lifting mechanism 20 applies an upward lifting force to the gripping mechanism 10, and the valve disc pressure plate 100 is vertically removed from the valve core 102.

[0084] Specifically, the operator holds the handle 22 and pulls it upwards vertically. The lifting rod 21 and the lifting force column 12 effectively apply upward pulling force, allowing the valve disc pressure plate 100 to be pulled out vertically, stably, and reliably without damaging the surface of the valve core 102. This step effectively avoids the risks of injury and equipment damage associated with traditional tilting disassembly methods, achieving safe removal in a vertical, gapless state.

[0085] Insertion steps: S4: The removed valve disc pressure plate 100 is vertically placed into the valve core 102 through the gripping mechanism 10.

[0086] Specifically, the operator holds the handle 22 to move the gripping mechanism 10 and the valve disc pressure plate 100 hooked on it above the valve core 102, and slowly inserts the valve disc pressure plate 100 into the installation position of the valve core 102 in the vertical direction. This step achieves symmetrical operation of removing and placing the pressure plate through the same gripping mechanism 10, ensuring the stability and controllability of the pressure plate during movement.

[0087] S5: Rotate the valve disc pressure plate 100 in the opposite direction to the gripping mechanism 10, so that the bolt hole 103 of the valve disc pressure plate 100 is aligned with the corresponding threaded hole 104 below, and switch the anti-disengagement structure 30 from the locked state to the unlocked state.

[0088] Specifically, the valve disc pressure plate 100 is rotated approximately 1° in the reverse direction along the horizontal plane, so that the bolt hole 103 of the valve disc pressure plate 100 is realigned with the corresponding threaded hole 104 below, and the anti-detachment structure 30 is disengaged from the limiting groove 105, switching from the locked state to the unlocked state. This step, through reverse rotation and reset, releases the hook relationship between the gripper 11 and the lower edge of the pressure plate, as well as the locking state of the anti-detachment structure 30, preparing for the gripper 11 to exit from the bolt hole 103.

[0089] S6: Pull the gripping mechanism 10 upward to make the gripping claw 11 retract from the bolt hole 103 of the valve disc pressure plate 100.

[0090] Specifically, the operator holds the handle 22 and pulls it upwards vertically, causing each gripper 11 to disengage from the bolt holes 103 of the valve disc pressure plate 100, thus completing the disassembly of the entire device. This step achieves rapid separation of the gripping mechanism 10 from the pressure plate, making the operation simple and efficient.

[0091] Thus, by coordinating the removal and placement steps, the valve disc pressure plate 100 can be removed and accurately placed back into place without damage while the valve core 102 is in a vertical position. During removal, the gripping claw 11 passes through the bolt hole 103 and hooks the lower edge of the pressure plate, automatically locking with the anti-slip structure 30 to ensure that the heavy pressure plate does not slip or fall during lifting. During placement, the hook and lock are released by reverse rotation, allowing the gripping claw 11 to smoothly retract. The entire disassembly and assembly process does not require tilting the heavy valve core assembly, fundamentally eliminating the risks of personnel injury from impacts and crushing, as well as equipment damage from collisions, scratches, and coaxiality misalignment. The operation is simple and efficient, and can be completed by a single person.

[0092] The method for disassembling and assembling the valve disc pressure plate also includes the following steps: S7: The upper pressure plate 41 of the pre-compression mechanism 40 is positioned above the valve disc pressure plate 100, and the lower pressure plate 42 is positioned below the valve disc pressure plate 100. A downward driving force is applied to the upper pressure plate 41 by the drive assembly 43 to compress the sealing ring 101.

[0093] Specifically, first place the main valve core 102 on the lower pressure plate 42, then place the upper pressure plate 41 above the valve disc pressure plate 100. After aligning the holes of the upper pressure plate 41 and the valve disc pressure plate 100, insert the force-bearing screw 431. Apply preload by rotating the first nut 432 with the torque wrench 200. First, apply an initial torque of 40 N·m. Measure the compression at the corresponding positions through the four measuring holes 412, record the measured values, and compare them with the steel-to-steel reference value. After confirming that the upper pressure plate 41 is not skewed, gradually increase the torque to 90-100 N·m by increasing the torque by 10-20 N·m each time. During the progressive loading process, the compression of the sealing ring 101 is measured through four measuring holes 412 after each loading stage. The measured data is compared with the steel-to-steel reference value. When the measured data at all four points are consistent with the reference value, it is determined that the sealing ring 101 has been uniformly compressed to a steel-to-steel fit. If there is a deviation in the measured data at a certain position, the loading sequence of the lead screw 431 at the corresponding position is adjusted to correct the deviation. This step uses external force pre-compression to forcibly compress the high-hardness sealing ring 101 to a steel-to-steel fit, without relying on bolt torque for forced compression, thus fundamentally protecting the bolt and threads.

[0094] S8: Insert the fastening bolts into the bolt holes 103 of the valve disc pressure plate 100 and tighten them, then remove the upper pressure plate 41 and the drive assembly 43.

[0095] Specifically, after the sealing ring 101 is compressed to a steel-to-steel fit, 12 fastening bolts are inserted through the mounting holes 411 on the upper pressure plate 41 and tightened sequentially to a torque of 25 N·m, completing the locking and fixing of the valve disc pressure plate 100. During the bolt tightening process, the upper pressure plate 41 maintains a pre-pressure on the valve disc pressure plate 100 to ensure that the sealing ring 101 remains in a steel-to-steel fit throughout the bolt tightening process. After all bolts are tightened, the upper pressure plate 41 and the tensioning screw 431 are removed, completing the entire installation operation. This step, by tightening the bolts after pre-compression, ensures that the sealing ring 101 remains compressed throughout the bolt tightening process, avoiding the problem of the sealing ring 101 springing back due to the removal of pre-pressure.

[0096] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0097] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A valve clack retainer dismounting device, characterized in that, include: The gripping mechanism includes a plurality of gripping claws distributed circumferentially, each of the gripping claws being used to pass through bolt holes in the valve disc pressure plate and extend below the valve disc pressure plate to hook the valve disc pressure plate from below; A lifting mechanism, connected to the gripping mechanism, is used to apply an upward lifting force to the gripping mechanism to vertically remove the valve disc pressure plate from the valve core; as well as An anti-detachment structure is provided on the gripping mechanism, and the anti-detachment structure has a locked state and an unlocked state; When the gripping mechanism extends into the bolt hole of the valve disc pressure plate, relative rotation can occur between the gripping mechanism and the valve disc pressure plate, so that the anti-detachment structure can switch from the unlocked state to the locked state, restricting the relative movement between the gripping mechanism and the valve disc pressure plate, and preventing the gripping mechanism from detaching from the valve disc pressure plate.

2. The valve disc pressure plate disassembly and assembly device as described in claim 1, characterized in that, The gripping claw is provided in three parts, which are evenly distributed around the circumference. Each gripping claw is used to hook onto the lower edge of the valve disc pressure plate.

3. The valve disc pressure plate disassembly and assembly device as described in claim 2, characterized in that, The gripping mechanism also includes: The lifting force column is positioned above each of the gripping claws and connected to each of the gripping claws.

4. The valve disc pressure plate disassembly and assembly device as described in any one of claims 1 to 3, characterized in that, The lifting mechanism includes: A lifting rod, one end of which is connected to the gripping mechanism; and A handle is connected to the end of the lifting rod furthest from the gripping mechanism, for the operator to hold and apply an upward lifting force.

5. The valve disc pressure plate disassembly and assembly device as described in claim 4, characterized in that, The handle has an arc-shaped structure, and there are three lifting rods, which are evenly spaced along the arc surface of the handle.

6. The valve disc pressure plate disassembly and assembly device as described in claim 4, characterized in that, The anti-detachment structure is an eccentric limiting block, which is movably installed on the lifting rod, and there is a gap between the eccentric limiting block and the lifting rod so that the eccentric limiting block can swing freely relative to the lifting rod.

7. The valve disc pressure plate disassembly and assembly device as described in claim 6, characterized in that, One side of the eccentric limiting block is provided with a limiting part, which can abut against the upper surface of the valve disc pressure plate to limit the falling depth of the eccentric limiting block.

8. The valve disc pressure plate disassembly and assembly device as described in any one of claims 1 to 3, characterized in that, The valve disc pressure plate disassembly and assembly device also includes: A pre-compression mechanism is used to apply downward pre-pressure to the valve disc pressure plate during reinstallation to compress the sealing ring.

9. The valve disc pressure plate disassembly and assembly device as described in claim 8, characterized in that, The pre-compression mechanism includes: An upper pressure plate is positioned above the valve disc pressure plate; A lower pressure plate, located below the valve disc pressure plate, is used to support the valve core; and A drive assembly, connected to the upper pressure plate, is used to apply a downward driving force to the upper pressure plate to drive the upper pressure plate to move toward the lower pressure plate.

10. The valve disc pressure plate disassembly and assembly device as described in claim 9, characterized in that, The driving component includes: A lead screw, one end of which is connected to the lower pressure plate, and the other end of which passes through the upper pressure plate and extends upward; and The first nut is threaded to one end of the lead screw that extends out of the upper pressure plate and is used to connect to a torque wrench.

11. The valve disc pressure plate disassembly and assembly device as described in claim 10, characterized in that, The pre-compression mechanism also includes: A support member, disposed below the lower pressure plate, is used to support the lower pressure plate; and The second nut is threaded to one end of the lead screw that extends out of the lower pressure plate and is used to connect to a torque wrench.

12. The valve disc pressure plate disassembly and assembly device as described in claim 9, characterized in that, The upper pressure plate has multiple mounting holes, which correspond to the bolt holes of the valve disc pressure plate.

13. The valve disc pressure plate disassembly and assembly device as described in claim 9, characterized in that, The upper pressure plate has multiple measuring holes, each of which is used for a measuring tool to be inserted and to measure the compression of the sealing ring.

14. A method for disassembling and assembling a valve disc pressure plate, characterized in that, Using the valve disc pressure plate disassembly and assembly device as described in any one of claims 1 to 13 includes the following steps: Removal steps: The gripping claw of the gripping mechanism passes through the bolt hole of the valve disc pressure plate and extends to the bottom of the valve disc pressure plate; The valve disc pressure plate is rotated to a preset angle relative to the gripping mechanism, so that the bolt hole of the valve disc pressure plate is misaligned with the corresponding threaded hole below, and the anti-disengagement structure is switched from the unlocked state to the locked state, so as to restrict the relative movement between the gripping mechanism and the valve disc pressure plate; The valve disc pressure plate is vertically removed from the valve core by applying an upward lifting force to the gripping mechanism through the lifting mechanism. Insertion steps: The removed valve disc pressure plate is vertically inserted into the valve core through the gripping mechanism; Rotate the valve disc pressure plate in the opposite direction relative to the gripping mechanism to realign the bolt hole of the valve disc pressure plate with the corresponding threaded hole below, and switch the anti-disengagement structure from the locked state to the unlocked state. Pull the gripping mechanism upwards to disengage the gripping claw from the bolt hole of the valve disc pressure plate.

Images