Nuclear reactor pressure vessel heat sleeve dismounting device

Abstract

The utility model discloses a dismounting and mounting device for a heat sleeve of a nuclear reactor pressure vessel. The dismounting and mounting device comprises an operating mechanism, an executing mechanism and a connecting rod mechanism, wherein the executing mechanism penetrates into the heat sleeve to reach the bottom of the heat sleeve; the connecting rod mechanism is used for feeding the executing mechanism into the heat sleeve; the operating mechanism is arranged at one end of the connecting rod mechanism, and the executing mechanism is arranged at the other opposite end of the connecting rod mechanism; the executing mechanism comprises a claw assembly capable of being opened and closed, and the operating mechanism is connected with the claw assembly through the connecting rod mechanism and drives the claw assembly to be opened and closed. When the hook claw assembly is in an open state, the hook claw assembly can be lifted at the bottom of the hot sleeve; when the hook claw assembly is in a closed state, the hook claw assembly can freely enter and exit from the heat sleeve. According to the utility model, the operating mechanism, the connecting rod mechanism and the executing mechanism are arranged in a matched manner, so that the heat sleeve can be disassembled and assembled in the pipe seat, the heat sleeve can be replaced and maintained, the service life of a nuclear reactor can be prolonged, the safety of the nuclear reactor can be improved, and the application prospect is good.

Description

Technical Field

[0001] This utility model relates to the technical field of nuclear reactor component disassembly and assembly equipment, and in particular to a device for disassembling and assembling the thermal jacket of a nuclear reactor pressure vessel. Background Technology

[0002] The primary function of the reactor pressure vessel thermal jacket is to provide a channel for the control rod drive rods. During unit operation, it guides the control rod drive rods and increases the flow cross-sectional area during control rod descent, allowing water to flow rapidly from the bottom to the top and improving the control rod descent time. During normal operation, when there is no control rod movement, the thermal jacket restricts the flow of hot water from the top cover into the CRDM (Control Rod Drive Mechanism). During rapid control rod descent, the thermal jacket prevents thermal shock from the primary coolant to the CRDM socket, protecting the CRDM socket and its welds.

[0003] During operation, the impact of water flow can cause the lower part of the heat jacket to sway, and the entire heat jacket to move vertically and circumferentially. This can lead to wear between the tapered surface of the heat jacket flange and the CRDM pipe seat. Specialized tools are required to replace and repair the heat jacket. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a device for disassembling and assembling the thermal jacket of a nuclear reactor pressure vessel.

[0005] The technical solution adopted by this utility model to solve its technical problem is: to provide a device for disassembling and assembling a hot jacket of a nuclear reactor pressure vessel, including an operating mechanism, an execution mechanism for penetrating the hot jacket to reach the bottom of the hot jacket, and a linkage mechanism for sending the execution mechanism into the hot jacket.

[0006] The operating mechanism is located at one end of the linkage mechanism, and the actuator is located at the opposite end of the linkage mechanism; the actuator includes an openable and closable hook assembly, and the operating mechanism is connected to and drives the hook assembly to open and close through the linkage mechanism;

[0007] When the hook assembly is in the open state, it can lift the bottom of the heat sleeve;

[0008] When the hook assembly is in the closed state, it can freely enter and exit the heat sleeve.

[0009] In one embodiment, the linkage mechanism includes an outer cylinder and a core rod that is movably inserted into the outer cylinder;

[0010] The operating mechanism is connected to the core rod and drives the core rod to rotate relative to the outer cylinder;

[0011] The actuator includes a lifting screw and a drive rod; the lifting screw is connected to the core rod, the drive rod is connected to the lifting screw, and the claw assembly is movably connected to the drive rod;

[0012] The lifting screw rotates with the core rod and converts the rotational motion into linear motion, driving the drive rod to move back and forth along the axial direction of the core rod, thereby opening and closing the claw assembly.

[0013] In one embodiment, the operating mechanism includes a connecting shaft and a rotating handle; the connecting shaft is connected to and fixed relative to the core rod; the rotating handle is fitted onto the connecting shaft and fixed relative to the connecting shaft, and drives the connecting shaft and the core rod to rotate by its own rotation.

[0014] In one embodiment, the operating mechanism further includes a connecting frame with a lifting ring, the connecting frame being disposed at the end of the linkage mechanism away from the actuator; the connecting frame having a U-shaped bend provides clearance for the rotation of the rotary handle.

[0015] In one embodiment, the linkage mechanism includes a plurality of linkage assemblies sequentially connected axially; each linkage assembly includes an outer cylinder section and a core rod section disposed within the outer cylinder section; the outer cylinder sections of two adjacent sets of linkage assemblies are axially connected by a connecting assembly, and the core rod sections of two adjacent sets of linkage assemblies are axially connected by a tongue-and-groove fitting structure; and / or,

[0016] The linkage mechanism also includes a limiting baffle disposed on the outer periphery of the outer cylinder for abutting against the top of the heat jacket.

[0017] In one embodiment, the connecting assembly includes a threaded male end sleeved and positioned at one end of the outer cylinder segment, a connecting sleeve sleeved and positioned at the adjacent end of another outer cylinder segment, and a connecting female end adapted to the threaded male end.

[0018] The threaded male and the connecting sleeve are provided with a snap-fit ​​structure that can be matched with each other. The connecting female is sleeved on the outer periphery of the snap-fit ​​structure and connected to the threaded male through threads.

[0019] In one embodiment, the actuator further includes a positioning sleeve and a support sleeve that are axially connected to the outer cylinder;

[0020] The positioning sleeve has a central channel with an internal thread that engages with the lifting screw; the lifting screw passes through the central channel and engages with the internal thread, and moves axially along the internal thread within the positioning sleeve as the core rod rotates.

[0021] The support sleeve is connected to the end of the positioning sleeve away from the outer cylinder, and the end of the drive rod away from the lifting screw passes into the support sleeve.

[0022] The side wall of the support sleeve has a through hole corresponding to the claw assembly. The drive rod moves back and forth in the axial direction of the support sleeve, causing the claw assembly to open and extend out of the through hole or close and retract into the through hole.

[0023] In one embodiment, the claw assembly includes at least two claws arranged circumferentially spaced apart, each claw engaging in a corresponding through hole;

[0024] The connecting end of the hook is rotatably connected to and supported on the support sleeve. The hooked end of the hook is rotatably connected to one end of a linkage shaft, and the other end of the linkage shaft is rotatably connected to the drive rod. The drive rod moves back and forth in the axial direction of the support sleeve, driving the linkage shaft to swing back and forth in the axial direction of the support sleeve, causing the hooked end of the hook to extend out of the through hole or retract into the through hole.

[0025] In one embodiment, the actuator further includes a guide cylinder connected to the end of the support sleeve away from the positioning sleeve; the end of the guide cylinder is a tapered end or an arc-shaped end.

[0026] In one embodiment, the actuator further includes a limiting component sleeved on the outer periphery of the drive rod; the limiting component includes a first limiting sleeve that is connected to the outer periphery of the positioning sleeve and a second limiting sleeve connected between the first limiting sleeve and the support sleeve; the central holes of the first limiting sleeve and the second limiting sleeve are connected to each other.

[0027] The beneficial effects of this utility model are as follows: By coordinating the operating mechanism, the linkage mechanism and the execution mechanism, it is used for the disassembly and assembly of the heat jacket in the tube seat, realizing the replacement and maintenance of the heat jacket, which is of great significance to improving the life and safety of nuclear reactors and has good application prospects. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0029] Figure 1 This is a schematic diagram of the structure of a nuclear reactor pressure vessel heat jacket disassembly and assembly device according to an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the structure of a nuclear reactor pressure vessel heat jacket assembly / disassembly device and heat jacket according to an embodiment of the present invention;

[0031] Figure 3 yes Figure 2A schematic diagram of the longitudinal cross-sectional structure;

[0032] Figure 4 yes Figure 2 A schematic diagram of the split structure of the connecting components;

[0033] Figure 5 yes Figure 2 Connection diagram of the central core rod;

[0034] Figure 6 yes Figure 2 A magnified schematic diagram of the actuator.

[0035] Figure 7 yes Figure 2 A partial structural breakdown diagram of the actuator;

[0036] Figure 8 This is a schematic diagram of the application of the nuclear reactor pressure vessel heat jacket disassembly and assembly device according to an embodiment of the present invention to the replacement of the heat jacket. Detailed Implementation

[0037] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0038] The present invention relates to a device for disassembling and assembling a thermal jacket of a nuclear reactor pressure vessel, which is used to insert into the thermal jacket to lift the thermal jacket out of the CRDM liner, or to lift the thermal jacket to place the thermal jacket into the liner.

[0039] like Figure 1 , Figure 2 As shown, a nuclear reactor pressure vessel heat jacket disassembly and assembly device according to an embodiment of the present invention includes an operating mechanism 100, a linkage mechanism 200 and an execution mechanism 300, wherein the operating mechanism 100 and the execution mechanism 300 are respectively disposed on opposite ends of the linkage mechanism 200.

[0040] The linkage mechanism 200 is used to feed the actuator 300 into the heat jacket 400. The actuator 300 penetrates the heat jacket 400 and reaches its bottom, thus supporting the heat jacket 400. The operating mechanism 100 is used to control the movement of the actuator 300, thereby enabling the actuator 300 to support or release the heat jacket 400. After the actuator 300 supports the heat jacket 400, the linkage mechanism 200 drives the actuator 300 to move up and down, removing the heat jacket 400 from the pipe seat or feeding the heat jacket 400 into the pipe seat.

[0041] The actuator 300 includes an openable and closable hook assembly 30, which can be in the open state to support the bottom of the heat jacket 400. The operating mechanism 100 is connected to and drives the hook assembly to open and close via a linkage mechanism 200. When the hook assembly 30 is in the open state, it supports the bottom of the heat jacket 400. At this time, the linkage mechanism 200 moves up and down, causing the hook assembly 30 to move up and down as a whole, thereby also causing the supported heat jacket 400 to move up and down. When the hook assembly 30 is in the closed state, the outer diameter of the actuator 300 is smaller than the inner diameter of the heat jacket 400, allowing the actuator 300 to move back and forth along the axial direction of the heat jacket 400 within the heat jacket 400, thus freely entering and exiting the heat jacket 400.

[0042] In one embodiment, combined with Figures 1 to 3 The linkage mechanism 200 may include an outer cylinder 21 and a core rod 22 movably inserted within the outer cylinder 21; the core rod 22 can rotate relative to the outer cylinder 21 (circumferential rotation). Correspondingly, the operating mechanism 100 is connected to the core rod 22 and drives the core rod 22 to rotate relative to the outer cylinder 21. The actuator 300 also includes a lifting screw 31 and a drive rod 32; the lifting screw 31 is connected to the core rod 22, the drive rod 32 is connected to the lifting screw 31, and the hook assembly 30 is movably connected to the drive rod 32. When the operating mechanism 100 drives the core rod 22 to rotate, the lifting screw 31 rotates with the core rod 22 and converts the rotational motion into linear motion, driving the drive rod 32 to move up and down in the axial direction of the core rod 22, thereby opening and closing the hook assembly 30.

[0043] Specifically, the operating mechanism 100 may be a manual operating mechanism, and may further include a connecting shaft 11 and a rotating handle 10. The connecting shaft 11 is connected to and relatively fixed to the core rod 22; the rotating handle 10 is sleeved on the connecting shaft 11 and relatively fixed to the connecting shaft 11, and the rotating handle 10 drives the connecting shaft 11 and the core rod 22 to rotate by its own rotation.

[0044] To achieve a relatively fixed connection, the connecting shaft 11 is preferably a non-circular shaft, such as a square shaft or other polygonal shaft. The connecting shaft 11 is inserted into the core rod 22 of the linkage mechanism 200, with one end embedded within the core rod 22 and the other end extending beyond the end of the linkage mechanism 200. The rotating handle 20 has a fixing hole adapted to the connecting shaft 11, and the rotating handle 20 is sleeved onto the connecting shaft 11 through this fixing hole, remaining relatively fixed to the connecting shaft 11. When the rotating handle 20 is operated to rotate, the core rod 22 is simultaneously rotated via the connecting shaft 11.

[0045] The operating mechanism 100 may also include a connecting frame 12 with a lifting ring 121, which can be fixed to the end of the linkage mechanism 200, which is also the end of the outer cylinder 21, via a fixing sleeve 13. A sliding bearing is installed between the fixing sleeve 13 and the core rod 22 to reduce frictional resistance.

[0046] The lifting ring 121 serves as the lifting point for transporting the entire heat pipe jacket assembly and disassembly device, and also as the hanging point for storing the heat pipe jacket assembly and disassembly device. The lifting ring 121 can be made by bending and welding.

[0047] The rotary handle 10 is rotatably supported on either the fixed sleeve 13 or the connecting bracket 12. The connecting bracket 12 has a U-shaped bend 122 to provide clearance for the rotation of the rotary handle 10. The connecting bracket 12 also serves to provide an operating handle when the rotary handle 10 is operated manually.

[0048] See Figures 1 to 3 In the linkage mechanism 200, the outer cylinder 21 can preferably be a carbon fiber outer cylinder, which reduces the weight of the linkage mechanism 200 to the maximum extent while ensuring strength.

[0049] To meet length requirements, the linkage mechanism 200 may include several linkage assemblies 20 and several connecting assemblies 23, with the linkage assemblies 20 sequentially connected axially via the connecting assemblies 23. The number of linkage assemblies 20 may be increased or decreased to meet different length requirements.

[0050] Each link assembly 20 includes an outer cylinder section and a core rod section disposed within the outer cylinder section; the outer cylinder sections of two adjacent link assemblies 20 are axially connected by a connecting assembly 23, and the core rod sections of two adjacent link assemblies 20 are axially connected by a convex-concave fit structure. All outer cylinder sections are connected to form an outer cylinder 21, and all core rod sections are connected to form a core rod 22.

[0051] The connecting component 23 adopts a separable mating structure, which facilitates the disassembly and assembly of the connecting rod components 20.

[0052] Combination Figures 2 to 4 The connecting component 23 may specifically include a threaded male head 231, a connecting sleeve 232, and a connecting female head 233. The threaded male head 231 is sleeved and positioned at the end of one outer cylinder segment, and the connecting sleeve 232 can be sleeved and positioned at the end of another adjacent outer cylinder segment. The connecting female head 233 is adapted to the threaded male head 231 and can be sleeved outside the connecting sleeve 232. Alternatively, the threaded male head 231 is sleeved and positioned at one end of the outer cylinder segment, and the connecting sleeve 232 can be sleeved and positioned at the opposite end of the outer cylinder segment, so that one outer cylinder segment can cooperate with the connecting sleeve 232 of another adjacent outer cylinder segment through the threaded male head 231 at its end.

[0053] The threaded male head 231 and the connecting sleeve 232 are provided with a snap-fit ​​structure 230 that can be matched with each other. After the threaded male head 231 and the connecting sleeve 232 are connected through the snap-fit ​​structure 230, the connecting female head 233 is sleeved on the outer periphery of the snap-fit ​​structure 230 and connected to the threaded male head 231 through threads, thereby connecting the connecting assembly 23 into one unit and axially connecting the two outer cylinder sections.

[0054] The snap-fit ​​structure 230 includes, but is not limited to, concave-convex fit and convex-tooth fit. For example, the snap-fit ​​structure 230 includes a matching baffle and a retaining groove; the end of the threaded male head 231 facing the connecting sleeve 232 is provided with an outwardly extending axial baffle, and the end of the connecting sleeve 232 facing the threaded male head 231 is provided with a retaining groove, the retaining groove corresponding to the baffle. When the threaded male head 231 and the connecting sleeve 232 are mated, the baffle is snapped into the retaining groove, thereby fixing the threaded male head 231 and the connecting sleeve 232 relatively in the circumferential direction.

[0055] When installing the threaded male head 231 at the end of the outer cylinder section, the threaded male head 231 is fitted onto one end of the outer cylinder section, and a locating pin is inserted radially into the end of the outer cylinder section to position the threaded male head 231 on the end of the outer cylinder section. Similarly, the connecting sleeve 232 is fitted onto the other end of the outer cylinder section, and a locating pin is inserted radially into the end of the connecting sleeve 232 and the end of the outer cylinder section to position the connecting sleeve 232 on the end of the outer cylinder section.

[0056] The interlocking structure between the core rod segments can withstand tensile force and transmit torque from the rotary handle 10. The interlocking structure between the core rod segments may include a mortise and tenon joint. (See reference) Figure 5 One core rod segment has a notch 221 at its end, and the adjacent core rod segment has a protrusion 222 at its end. The notch 221 and the protrusion 222 are fitted together. To ensure axial connection between the core rod segments and prevent separation in the axial direction, the notch 221 and the protrusion 222 can be circular, trapezoidal, or other shapes of unequal width.

[0057] The linkage mechanism 200 may further include a limiting baffle 24, which is disposed on the outer periphery of the outer cylinder 21 and can abut against the top of the heat jacket 400. This prevents the linkage mechanism 200 from penetrating the heat jacket 400 by an excessive length and also ensures the relative position of the limiting baffle 24 and the actuator 300 disposed at the end of the linkage mechanism 200, ensuring that the hook assembly 30 accurately reaches the bottom of the heat jacket 400. Preferably, the axial distance between the limiting baffle 24 and the hook assembly 30 is greater than or equal to the length of the heat jacket 400 (excluding the flared portion).

[0058] In an embodiment where the linkage mechanism 200 includes several linkage assemblies 20, the actuator 300 is disposed on the linkage assembly 20 at one end of the linkage mechanism 200, and the limiting baffle 24 may be disposed on the outer periphery of the connecting assembly 23.

[0059] Combination Figure 3 , Figure 6 and Figure 7The connection between the lifting screw 31 and the core rod 22 of the actuator 300 can also be achieved using a concave-convex fit structure. This concave-convex fit structure can refer to the concave-convex fit structure between the core rod segments, and can also withstand tension and transmit torque from the rotary handle 10. The connection between the drive rod 32 and the lifting screw 31 can also use a concave-convex fit structure, with one side having a notch and the other side having a protrusion (such as a ball head).

[0060] The actuator 300 also includes a positioning sleeve 33 and a support sleeve 34. The positioning sleeve 33 is axially connected to the outer cylinder 21 of the linkage mechanism 200, and the two are fixed relative to each other. The positioning sleeve 33 has a central channel with an internal thread 331 that mates with the lifting screw 31. The lifting screw 31 passes through the central channel and mates with the internal thread 331. When the lifting screw 31 rotates with the core rod 22, it moves axially along the internal thread 331 within the positioning sleeve 33, thereby pulling the moving core rod 22 axially toward the end of the actuator 300 along the outer cylinder 21. This achieves the overall axial movement of the core rod 21, the lifting screw 31, and the drive rod 32, thereby driving the hook assembly 30 to open and close.

[0061] The support sleeve 34 is connected to the end of the positioning sleeve 33 away from the outer cylinder 22, the end of the drive rod 32 away from the lifting screw 31 is inserted into the support sleeve 34, and the hook assembly 30 is disposed inside the support sleeve 34.

[0062] Specifically, the side wall of the support sleeve 34 is provided with a through hole 341 corresponding to the claw assembly 30. The drive rod 32 moves back and forth in the axial direction of the support sleeve 34, driving the claw assembly 30 to open and extend out of the through hole 341 or close and retract into the through hole 341.

[0063] The hook assembly 30 further includes at least two hooks 301 arranged circumferentially on the drive rod 32 at intervals. The number of through holes 341 on the support sleeve 34 is the same as the number of hooks 301, and each hook 301 fits into a corresponding through hole 341. When there are two hooks 301, they are preferably connected to opposite sides of the drive rod 32.

[0064] Each hook 301 has a connecting end and a hook end. The connecting end of the hook 301 is rotatably connected to and supported on the support sleeve 34 via a rotating shaft, specifically within the through hole 341. The hook end of the hook 301 is connected to the drive rod 32 via a connecting shaft 302, and they are rotatable relative to each other. Specifically, one end of the connecting shaft 302 is rotatably connected to the hook end of the hook 301, and the other end is rotatably connected to the drive rod 32. When the drive rod 32 moves back and forth axially in the support sleeve 34, it drives the connecting shaft 302 to swing back and forth axially in the support sleeve 34, causing the hook end of the hook 301 to extend out of or retract into the through hole 341. After the hook end of the hook 301 extends out of the through hole 341, it can be lifted at the bottom of the heat sleeve 400; when the hook end of the hook 301 is driven to retract into the through hole 341, the hook end leaves the bottom of the heat sleeve 400.

[0065] To prevent the drive rod 32 from wobbling, a limiting component is provided between the positioning sleeve 33 and the support sleeve 34. The limiting component is sleeved on the exposed section of the drive rod 32 located between the support sleeve 34 and the positioning sleeve 33. The limiting component may include a first limiting sleeve 36 that is threadedly connected to the outer periphery of the positioning sleeve 33, and a second limiting sleeve 362 that is threadedly connected to the first limiting sleeve 36. The central holes of the first limiting sleeve 361 and the second limiting sleeve 362 are opposite to and communicate with each other, allowing the exposed section of the drive rod 32 to movably pass through them.

[0066] Furthermore, the actuator 300 also includes a guide cylinder 35 connected to the end of the support sleeve 34 away from the positioning sleeve 33. The end of the guide cylinder 35 away from the support sleeve 34 is closed, and the end is a tapered end or an arc end, which can guide the actuator 300 into the heat sleeve 400 and also avoid sharp corners scratching the heat sleeve 400.

[0067] Combination Figures 1 to 3 and Figure 8 The procedure for replacing the 400mm heat jacket using the nuclear reactor pressure vessel heat jacket disassembly and assembly device of this invention is as follows:

[0068] 1) Removing the old heat jacket assembly: Erect scaffolding above the pressure vessel top cover 500, remove the control rod drive mechanism, and remove the lower guide device (flared end) of the heat jacket. Hoist the nuclear reactor pressure vessel heat jacket disassembly and assembly device to the top of the heat jacket to be replaced. The operator holds the upper end of the nuclear reactor pressure vessel heat jacket disassembly and assembly device for assistance. Position the nuclear reactor pressure vessel heat jacket disassembly and assembly device with the actuator 300 facing and inserted into the heat jacket 400. Operate the rotating handle 10 to open the hook assembly 30. The hook assembly 30 of the actuator 300 supports the heat jacket 400 from the inside. Lift the nuclear reactor pressure vessel heat jacket disassembly and assembly device to lift the heat jacket 400 away from the pipe seat 600, and then place it into the storage cylinder.

[0069] 2) Install the new heat jacket assembly: Insert the new heat jacket 400 into the end where the actuator 300 is located. Operate the rotating handle 10 to open the hook assembly 30, allowing the hook assembly 300 to lift the heat jacket 400. Hoist the nuclear reactor pressure vessel heat jacket installation and removal device and the lifted heat jacket 400 to the position above the heat jacket to be replaced. The operator holds the upper end of the nuclear reactor pressure vessel heat jacket installation and removal device for assistance, passing the heat jacket 400 through the center of the pipe seat 600 until the heat jacket 400 is in place. Operate the rotating handle 10 to close the hook assembly 300, and after hoisting the nuclear reactor pressure vessel heat jacket installation and removal device away from the heat jacket 400, store it on the hanger.

[0070] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A device for disassembling and assembling a thermal jacket on a nuclear reactor pressure vessel, characterized in that, It includes an operating mechanism, an actuator for penetrating the heat jacket to reach the bottom of the heat jacket, and a linkage mechanism for feeding the actuator into the heat jacket; The operating mechanism is located at one end of the linkage mechanism, and the actuator is located at the opposite end of the linkage mechanism; the actuator includes an openable and closable hook assembly, and the operating mechanism is connected to and drives the hook assembly to open and close through the linkage mechanism; When the hook assembly is in the open state, it can lift the bottom of the heat sleeve; When the hook assembly is in the closed state, it can freely enter and exit the heat sleeve.

2. The nuclear reactor pressure vessel thermal jacket disassembly and assembly device according to claim 1, characterized in that, The linkage mechanism includes an outer cylinder and a core rod that can be movably inserted into the outer cylinder; The operating mechanism is connected to the core rod and drives the core rod to rotate relative to the outer cylinder; The actuator includes a lifting screw and a drive rod; the lifting screw is connected to the core rod, the drive rod is connected to the lifting screw, and the claw assembly is movably connected to the drive rod; The lifting screw rotates with the core rod and converts the rotational motion into linear motion, driving the drive rod to move back and forth in the axial direction of the core rod, thereby opening and closing the claw assembly.

3. The nuclear reactor pressure vessel thermal jacket disassembly and assembly device according to claim 2, characterized in that, The operating mechanism includes a connecting shaft and a rotating handle; the connecting shaft is connected to and fixed relative to the core rod; the rotating handle is attached to the connecting shaft and fixed relative to the connecting shaft, and drives the connecting shaft and the core rod to rotate by its own rotation.

4. The nuclear reactor pressure vessel thermal jacket disassembly and assembly device according to claim 3, characterized in that, The operating mechanism also includes a connecting frame with a lifting ring, which is disposed at the end of the linkage mechanism away from the actuator; the connecting frame has a U-shaped bend to provide clearance for the rotation of the rotary handle.

5. The device for disassembling and assembling the thermal jacket of a nuclear reactor pressure vessel according to claim 2, characterized in that, The linkage mechanism includes a plurality of linkage assemblies connected sequentially in the axial direction; each linkage assembly includes an outer cylinder section and a core rod section disposed within the outer cylinder section; the outer cylinder sections of two adjacent sets of linkage assemblies are axially connected by a connecting assembly, and the core rod sections of two adjacent sets of linkage assemblies are axially connected by a concave-convex fit structure; and / or, The linkage mechanism also includes a limiting baffle disposed on the outer periphery of the outer cylinder for abutting against the top of the heat jacket.

6. The nuclear reactor pressure vessel thermal jacket disassembly and assembly device according to claim 5, characterized in that, The connecting assembly includes a threaded male end sleeved and positioned at one end of the outer cylinder segment, a connecting sleeve sleeved and positioned at the other adjacent end of the outer cylinder segment, and a connecting female end adapted to the threaded male end. The threaded male and the connecting sleeve are provided with a snap-fit ​​structure that can be matched with each other. The connecting female is sleeved on the outer periphery of the snap-fit ​​structure and connected to the threaded male through threads.

7. The nuclear reactor pressure vessel thermal jacket disassembly and assembly device according to claim 2, characterized in that, The actuator also includes a positioning sleeve and a support sleeve that are axially connected to the outer cylinder; The positioning sleeve has a central channel with an internal thread that engages with the lifting screw; the lifting screw passes through the central channel and engages with the internal thread, and moves axially along the internal thread within the positioning sleeve as the core rod rotates. The support sleeve is connected to the end of the positioning sleeve away from the outer cylinder, and the end of the drive rod away from the lifting screw passes into the support sleeve. The side wall of the support sleeve has a through hole corresponding to the claw assembly. The drive rod moves back and forth in the axial direction of the support sleeve, causing the claw assembly to open and extend out of the through hole or close and retract into the through hole.

8. The nuclear reactor pressure vessel thermal jacket disassembly and assembly device according to claim 7, characterized in that, The hook assembly includes at least two hooks arranged circumferentially spaced apart, each hook engaging in a corresponding through hole; The connecting end of the hook is rotatably connected to and supported on the support sleeve. The hooked end of the hook is rotatably connected to one end of a linkage shaft, and the other end of the linkage shaft is rotatably connected to the drive rod. The drive rod moves back and forth in the axial direction of the support sleeve, driving the linkage shaft to swing back and forth in the axial direction of the support sleeve, causing the hooked end of the hook to extend out of the through hole or retract into the through hole.

9. The nuclear reactor pressure vessel thermal jacket disassembly and assembly device according to claim 7, characterized in that, The actuator further includes a guide cylinder connected to the end of the support sleeve away from the positioning sleeve; the end of the guide cylinder is a tapered end or an arc end.

10. The nuclear reactor pressure vessel thermal jacket disassembly and assembly device according to claim 7, characterized in that, The actuator further includes a limiting component sleeved on the outer periphery of the drive rod; the limiting component includes a first limiting sleeve that is connected to the outer periphery of the positioning sleeve and a second limiting sleeve that is connected between the first limiting sleeve and the support sleeve; the central holes of the first limiting sleeve and the second limiting sleeve are connected to each other and communicate with each other.

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