Nuclear reactor control rod drive rod hoist

Abstract

The application belongs to the technical field of hoisting, and provides a nuclear reactor control rod drive rod hoisting device, which comprises a rod body, a clamping assembly and a lock assembly. The clamping assembly is arranged at the end of the rod body and is used for clamping the drive rod in a closed state. The clamping assembly can be separated from the drive rod in an open state. The lock assembly is movably arranged on the rod body and connected with the clamping assembly. The lock assembly has a first position and a second position. When the lock assembly is in the first position, the clamping assembly is in the open state. When the lock assembly moves from the first position to the second position relative to the rod body, the lock assembly can drive the clamping assembly to switch from the open state to the closed state. When the nuclear reactor control rod drive rod hoisting device is in a hoisting state, the lock assembly can be kept in the second position under the action of gravity. Under the action of gravity, the lock assembly can form self-locking, so that the clamping assembly keeps clamping the drive rod, the risk of falling of the drive rod is reduced, and the safety of operation is improved.

Description

Technical Field

[0001] This application belongs to the field of hoisting technology, and more specifically, relates to a hoisting device for a nuclear reactor control rod drive rod. Background Technology

[0002] After a long period of operation, nuclear power plant reactors require maintenance of the control rod guide tubes. Before maintenance, the drive rods must be disassembled, hoisted away, and stored in a temporary storage rack. The wear and tear inside the guide tubes is then inspected. After the inspection, the drive rods are reinstalled in the guide tubes. However, current drive rod hoisting devices are unable to stably hoist the drive rods, posing a safety hazard of them falling and hindering safe operation. Utility Model Content

[0003] The purpose of this application is to provide a nuclear reactor control rod drive rod hoisting device to reduce the risk of the drive rod falling during the hoisting process.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0005] A nuclear reactor control rod drive rod hoisting device is provided, comprising:

[0006] Rod body;

[0007] A clamping assembly is disposed at the end of the rod body. The clamping assembly includes a plurality of claw hooks, which are arranged at intervals around the central axis of the rod body and are movably connected to the rod body. When the clamping assembly is closed, the plurality of claw hooks converge toward the central axis of the rod body to clamp the drive rod. When the clamping assembly is open, the plurality of claw hooks move away from the central axis of the rod body to be able to separate from the drive rod.

[0008] The locking assembly has a first position and a second position. When the locking assembly is in the first position, it avoids the claw hook to allow the clamping assembly to be in the open state. When the locking assembly moves relative to the rod from the first position to the second position, it can connect with the claw hook to allow the clamping assembly to switch from the open state to the closed state. When the nuclear reactor control rod drive rod hoisting device is in the hoisting state, the locking assembly can be held in the second position under the action of gravity.

[0009] In some embodiments, the locking assembly includes a sleeve fitted around the outer periphery of the rod. The sleeve is movable relative to the rod. When the locking assembly is in the first position, the sleeve avoids the pawl hook to move the pawl hook away from the central axis of the rod. When the locking assembly moves to the second position, the inner wall of the sleeve can compress the pawl hook to rotate, thereby driving the pawl hook closer to the central axis of the rod so that the pawl hook can be connected to the drive rod.

[0010] In some embodiments, one of the sleeve and the rod is provided with a limiting groove, the length of which extends along the length direction of the rod, and the other of the sleeve and the rod is provided with a limiting member that is slidably adapted to the limiting groove, so that the sleeve slides along the length direction of the rod.

[0011] In some embodiments, the clamping assembly includes at least two clamping members, all of which are spaced apart around the central axis of the rod. Each clamping member has a first end and a second end that are disposed opposite to each other. The first end is rotatably connected to the rod. The claw hooks correspond one-to-one with the clamping members and are disposed on the side of the second end facing the central axis of the rod. When the locking assembly is in the first position, the second end is away from the central axis of the rod, and the sleeve avoids the second end. When the locking assembly moves to the second position, the inner wall of the sleeve can squeeze the second end to drive the claw hooks closer to the central axis of the rod.

[0012] In some embodiments, one end of the rod is provided with a tube, the central hollow area of ​​the tube is used to accommodate the drive rod, the side wall of the tube is provided with a connecting hole communicating with the central hollow area of ​​the tube, and the clamping member is disposed in the connecting hole.

[0013] In some embodiments, the opening at the end of the tube opposite to the rod is funnel-shaped.

[0014] In some embodiments, the tube body is provided with a limiting surface, which is used to abut against the end face of the drive rod.

[0015] In some embodiments, the clamping member is rotatably connected to the rod body via a rotating shaft. A protrusion is provided on the side of the first end, and the protrusion is located on the side of the rotating shaft opposite to the second end. When the locking assembly is switched from the second position to the first position, the inner wall of the sleeve can squeeze the protrusion to drive the clamping member to rotate, so that the claw hook is away from the central axis of the rod body.

[0016] The sleeve is provided with a first clearance hole, and when the lock assembly is in the second position, the protrusion is located in the first clearance hole.

[0017] In some embodiments, the clamping assembly further includes an elastic element, the two ends of which are respectively connected to the rod and the clamping member. The elastic force of the elastic element is used to drive the second end away from the central axis of the rod. When the locking assembly is in the second position, the locking assembly can overcome the elastic force of the elastic element to keep the clamping assembly in the closed state.

[0018] In some embodiments, the outer periphery of the rod is provided with at least one first handle, and the locking assembly is provided with at least one second handle. The first handle and the second handle are used to apply external force to switch the locking assembly between the first position and the second position.

[0019] The beneficial effects of the nuclear reactor control rod drive rod hoisting device provided in this application are as follows: when the locking assembly is in the second position, it can drive the clamping assembly to be in a closed state. When the nuclear reactor control rod drive rod hoisting device is in the hoisting state, the locking assembly can be held in the second position under the action of gravity. At this time, the locking assembly in the second position can keep the clamping assembly in a closed state. It is equivalent to the locking assembly forming a self-locking under the action of gravity, so that the clamping assembly keeps clamping the drive rod. In this way, the connection stability between the nuclear reactor control rod drive rod hoisting device and the drive rod can be improved, the risk of the drive rod falling can be reduced, and the safety of the operation can be improved. 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 A schematic diagram of the nuclear reactor control rod drive rod hoisting device and drive rod provided in the embodiments of this application;

[0022] Figure 2 A cross-sectional schematic diagram of the nuclear reactor control rod drive rod hoisting device and drive rod provided in the embodiments of this application;

[0023] Figure 3 for Figure 2 An enlarged view of point A in the diagram;

[0024] Figure 4 An enlarged schematic diagram of the nuclear reactor control rod drive rod hoisting device provided in the embodiments of this application;

[0025] Figure 5A schematic diagram of a nuclear reactor control rod drive rod hoisting device and crane provided in an embodiment of this application.

[0026] The following are the labeling elements in the figure:

[0027] 100. Crane; 200. Lifting platform; 300. Drive rod; 3001. Groove; 400. Lifting device;

[0028] 1. Rod body; 11. First rod segment; 12. Second rod segment; 13. Third connector; 14. Tube body; 15. Limiting component; 16. First handle;

[0029] 2. Locking assembly; 21. Sleeve; 211. First sleeve segment; 212. Second sleeve segment; 213. First connector; 214. Second connector; 215. Movable sleeve; 216. Locking sleeve; 217. Limiting groove; 218. First clearance hole; 219. Limiting surface; 22. Second handle;

[0030] 3. Clamping assembly; 31. Clamping element; 311. First end; 3111. Protrusion; 312. Second end; 3121. Claw hook; 33. Rotating shaft;

[0031] 4. Lifting eye assembly; 41. Lifting eye body; 42. Mounting plate; 43. Nut; 44. Cotter pin;

[0032] 51. First component; 52. Second component. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] In nuclear power plants, the reactor, as the core equipment, bears the crucial mission of maintaining a controlled, self-sustaining chain reaction of nuclear fission, thereby achieving the efficient utilization of nuclear energy. The reactor control rods are key components within the nuclear reactor that control the rate of the nuclear fission reaction; their precise positioning is essential for the stable operation of the reactor and the safe utilization of nuclear energy. The control rods are connected to the drive rods of the control rod drive mechanism (CRDM), and are driven to move by the drive rods. Simultaneously, guide tubes provide precise guidance for their movement, thus enabling flexible adjustment of the control rods' position within the reactor core.

[0038] After a long period of operation, the guide cylinder needs to be inspected. Before the inspection, the drive rod needs to be disassembled, lifted away, and stored in a temporary storage rack. Then, the wear inside the guide cylinder needs to be inspected. After the inspection is completed, the drive rod is reinstalled into the guide cylinder.

[0039] However, current drive rod hoisting devices are unable to stably hoist the drive rod, resulting in a safety hazard of the drive rod falling and hindering safe operation.

[0040] Based on this, this application provides a nuclear reactor control rod drive rod hoisting device to solve the above problems.

[0041] Reference Figures 1 to 4This application provides a nuclear reactor control rod drive rod hoisting device 400 (hereinafter referred to as hoisting device 400), which includes a rod body 1, a clamping assembly 3, and a locking assembly 2. The clamping assembly 3 is disposed at the end of the rod body 1 and includes multiple claw hooks 3121. The multiple claw hooks 3121 are arranged at intervals around the central axis of the rod body 1 and are movably connected to the rod body 1. When the clamping assembly 3 is in the closed state, the multiple claw hooks 3121 converge toward the central axis of the rod body 1 to clamp the drive rod 300. When the clamping assembly 3 is in the open state... Multiple claw hooks 3121 are located away from the central axis of the rod body 1 so as to be able to separate from the drive rod 300; the locking assembly 2 is movably disposed on the rod body 1 and connected to the clamping assembly 3. The locking assembly 2 has a first position and a second position. When the locking assembly 2 is in the first position, the clamping assembly 3 is in the open state. When the locking assembly 2 moves relative to the rod body 1 from the first position to the second position, the locking assembly 2 can drive the clamping assembly 3 to switch from the open state to the closed state. When the lifting device 400 is in the lifting state, the locking assembly 2 can be held in the second position under the action of gravity.

[0042] It should be noted that in the diagram, the locking component 2 is in the second position, and the clamping component 3 is in the closed state.

[0043] It should be noted that in some embodiments, the clamping assembly 3 may be provided with two claw hooks 3121, which are arranged around the central axis of the rod body 1. When the clamping assembly 3 is in the closed state, the two claw hooks 3121 converge toward the central axis of the rod body 1, thus clamping the drive rod 300. In other embodiments, the clamping assembly 3 may be provided with three or more claw hooks 3121. In the embodiments of this application, the clamping assembly 3 is provided with three claw hooks 3121. The claw hooks 3121 can hook into the grooves 3001 at the end of the drive rod 300 to achieve connection with the drive rod 300. Of course, the shape of the claw hooks 3121 can be adapted to the shape of the grooves 3001 of the drive rod 300.

[0044] It should be noted that a lifting ring assembly 4 can be provided at the end of the rod 1 away from the clamping assembly 3. The lifting ring assembly 4 can be connected to the hook to facilitate the lifting of the lifting device 400 provided in this embodiment. When the lifting device 400 is in the lifting state, the rod 1 can be in a vertical state, that is, when the lifting device 400 is in the lifting state, the length direction of the rod 1 is perpendicular to the horizontal plane. At this time, the clamping assembly 3 can be located at the lower end of the rod 1, and the higher end of the rod 1 can be used to connect with the crane 100 to realize the lifting.

[0045] It should be noted that the locking assembly 2 is connected to the clamping assembly 3. The locking assembly 2 can drive the clamping assembly 3 to move to switch between an open state and a closed state. When the locking assembly 2 is in the first position, the clamping assembly 3 is in the open state. At this time, the clamping assembly 3 can move closer to or further away from the drive rod 300. When the locking assembly 2 moves from the first position to the second position relative to the rod 1, the locking assembly 2 can drive the clamping assembly 3 to switch from the open state to the closed state. At this time, the clamping assembly 3 can clamp the drive rod 300.

[0046] It should be noted that when the lifting device 400 is in the lifting state, the locking assembly 2 can be held in the second position under the action of gravity. This means that when the lifting device 400 is in the lifting state, the locking assembly 2 can be held in the second position by its own weight. Of course, when the lifting device 400 is in the lifting state, the self-weight of the locking assembly 2 can move the locking assembly 2 from the first position to the second position and hold it in the second position to form a self-locking mechanism. In this case, the locking assembly 2 can keep the clamping assembly 3 in a closed state.

[0047] The hoisting device 400 provided in this application embodiment can drive the clamping component 3 to be in a closed state when the locking component 2 is in the second position. When the hoisting device 400 is in the hoisting state, the locking component 2 can be held in the second position under the action of gravity. At this time, the locking component 2 in the second position can keep the clamping component 3 in a closed state. It is equivalent to the locking component 2 forming a self-locking under the action of gravity, so that the clamping component 3 keeps clamping the drive rod 300. In this way, the connection stability between the hoisting device 400 and the drive rod 300 can be improved, the risk of the drive rod 300 falling can be reduced, and the safety of the operation can be improved.

[0048] Reference Figure 3 and Figure 4 The locking assembly 2 includes a sleeve 21, which is sleeved on the outer periphery of the rod 1. The sleeve 21 can move relative to the rod 1. When the locking assembly 2 is in the first position, the sleeve 21 avoids the claw hook 3121 so that the claw hook 3121 is away from the central axis of the rod 1. When the locking assembly 2 moves to the second position, the inner wall of the sleeve 21 can squeeze the claw hook 3121 to rotate so as to drive the claw hook 3121 to approach the central axis of the rod 1 so that the claw hook 3121 can be connected to the drive rod 300.

[0049] When the locking assembly 2 is in the first position, the sleeve 21 avoids the claw hook 3121, and the claw hook 3121 is away from the central axis of the rod 1. At this time, the claw hook 3121 can approach or move away from the drive rod 300. When the locking assembly 2 moves to the second position, the inner wall of the sleeve 21 can squeeze the claw hook 3121 to rotate, thereby driving the claw hook 3121 to approach the central axis of the rod 1. The claw hook 3121 can then connect with the drive rod 300. At this time, the clamping assembly 3 can clamp the drive rod 300. When the locking assembly 2 moves to the second position, the inner wall of the sleeve 21 squeezes the claw hook 3121 to rotate. Therefore, when the locking assembly 2 is held in the second position, the sleeve 21 can continuously squeeze the claw hook 3121 to maintain the connection between the claw hook 3121 and the drive rod 300. The locking assembly 2 can also be held in the second position under the action of gravity. Thus, under the action of gravity, the locking assembly 2 can lock the clamping assembly 3 in a closed state, which helps to improve the connection stability between the lifting device 400 and the drive rod 300.

[0050] Reference Figure 1 and Figure 4 One of the sleeve 21 and the rod 1 is provided with a limiting groove 217, the length of which extends along the length direction of the rod 1. The other of the sleeve 21 and the rod 1 is provided with a limiting member 15 that is slidably adapted to the limiting groove 217, so that the sleeve 21 slides along the length direction of the rod 1.

[0051] It should be noted that in some embodiments, the limiting groove 217 can be provided on the sleeve 21, in which case the limiting member 15 is provided on the rod body 1. In other embodiments, the limiting groove 217 can be provided on the rod body 1, and the limiting member 15 can be provided on the sleeve 21. In the figure, the limiting groove 217 is provided on the sleeve 21, and the limiting member 15 is provided on the rod body 1. The limiting member 15 can be a protrusion provided on the surface of the rod body 1. When the sleeve 21 slides relative to the rod body 1, the limiting member 15 can slide within the limiting groove 217.

[0052] A limiting groove 217 and a limiting member 15 are provided in the sleeve 21 and the rod 1. The limiting member 15 is slidably adapted to the limiting groove 217, and the length of the limiting groove 217 extends along the length direction of the rod 1. The cooperation of the limiting member 15 and the limiting groove 217 can limit the movement direction of the sleeve 21 to the length direction of the rod 1. When the hoisting device 400 is in the hoisting state, the length direction of the rod 1 is vertical. Then, most or even all of the weight of the sleeve 21 can be used to keep the sleeve 21 in the second position. This helps to improve the connection stability between the hoisting device 400 and the drive rod 300.

[0053] In some embodiments, the limiting groove 217 may be a strip-shaped through hole structure provided in the sleeve 21.

[0054] Reference Figure 3 and Figure 4 The clamping assembly 3 includes at least two clamping members 31. All clamping members 31 are arranged at intervals around the central axis of the rod body 1. The clamping members 31 have a first end 311 and a second end 312 that are disposed opposite to each other. The first end 311 is rotatably connected to the rod body 1. The claw hook 3121 corresponds to the clamping member 31 and is disposed on the side of the second end 312 facing the central axis of the rod body 1. When the locking assembly 2 is in the first position, the second end 312 is away from the central axis of the rod body 1, and the sleeve 21 avoids the second end 312. When the locking assembly 2 moves to the second position, the inner wall of the sleeve 21 can squeeze the second end 312 to drive the claw hook 3121 to approach the central axis of the rod body 1.

[0055] It should be noted that when the locking assembly 2 is in the first position, the second end 312 is away from the central axis of the rod 1, the sleeve 21 avoids the second end 312, and the clamping assembly 3 is in the open state. At this time, the clamping assembly 3 can approach or move away from the drive rod 300. When the locking assembly 2 moves to the second position, the inner wall of the sleeve 21 can squeeze the second end 312 to drive the claw hook 3121 to approach the central axis of the rod 1, so that the clamping assembly 3 is in the closed state. At this time, at least two clamping members 31 can clamp the drive rod 300 to achieve the connection between the clamping assembly 3 and the drive rod 300.

[0056] When the locking assembly 2 is in the first position, the second end 312 is away from the central axis of the rod 1, and the sleeve 21 avoids the second end 312. That is, at this time, the sleeve 21 will not squeeze the second end 312. The second end 312 can drive the claw hook 3121 away from the central axis of the rod 1. At this time, the clamping assembly 3 is in the open state, and the clamping assembly 3 can approach or move away from the drive rod 300. When the locking assembly 2 moves to the second position, the inner wall of the sleeve 21 can squeeze the second end 312 to drive the claw hook 3121 to approach the central axis of the rod 1, so that the clamping assembly 3 is in the closed state. All the clamping parts 31 can abut against the drive rod 300 together, and the claw hook 3121 provided at the second end 312 can be inserted into the groove 3001 of the drive rod 300, so that the clamping assembly 3 and the drive rod 300 are kept connected.

[0057] In some embodiments, one end of the rod 1 is provided with a tube 14, one end of the tube 14 is connected to the end of the rod 1, the central hollow area of ​​the tube 14 is used to accommodate the drive rod 300, the side wall of the tube 14 is provided with a connecting hole communicating with the central hollow area of ​​the tube 14, and the clamping member 31 is disposed in the connecting hole.

[0058] One end of the rod 1 is provided with a tube 14, and the clamping member 31 is installed in the connecting hole of the tube 14. This facilitates the positioning and installation of the clamping member 31 and reduces the assembly difficulty of the hoisting device 400.

[0059] In some embodiments, the opening of the tube 14 away from the end of the rod 1 is funnel-shaped.

[0060] It should be noted that the opening of the tube 14 away from the end of the rod 1 is trumpet-shaped, which means that the diameter of the opening of the tube 14 away from the rod 1 is larger than the diameter of the opening of the tube 14 near the end of the rod 1, and the sidewall of the opening of the tube 14 can form a guiding structure.

[0061] The opening of the tube body 14 away from the rod body 1 is funnel-shaped, and the side wall of the opening of the tube body 14 can form a guide structure to guide the drive rod 300 into the tube body 14. In this way, the claw hook 3121 can be easily inserted into the groove 3001 of the drive rod 300.

[0062] In some embodiments, the tube body 14 may also be provided with a limiting surface 219, which can abut against the end face of the drive rod 300 to limit the depth of the drive rod 300 inserted into the tube body 14. Thus, when the drive rod 300 abuts against the limiting surface 219, it indicates that the drive rod 300 is inserted in place. At this time, the position of the sleeve 21 can be adjusted to insert the claw hook 3121 into the groove 3001 of the drive rod 300, making it convenient to connect the lifting device 400 to the drive rod 300.

[0063] Reference Figure 3 and Figure 4 In some embodiments, the clamping member 31 is rotatably connected to the rod body 1 via a rotating shaft 33. A protrusion 3111 is provided on the side of the first end 311. The protrusion 3111 is located on the side of the rotating shaft 33 away from the second end 312. When the locking assembly 2 switches from the second position to the first position, the inner wall of the sleeve 21 can squeeze the protrusion 3111 to drive the clamping member 31 to rotate, so that the claw hook 3121 is away from the central axis of the rod body 1.

[0064] It should be noted that in this embodiment, when the locking component 2 switches from the second position to the first position, the sleeve 21 can squeeze the protrusion 3111 when it slides, so as to drive the clamping component 3 to switch from the closed state to the open state.

[0065] When the locking assembly 2 switches from the second position to the first position, the inner wall of the sleeve 21 presses the protrusion 3111 to drive the clamping member 31 to rotate, and the clamping assembly 3 switches from the closed state to the open state. When the locking assembly 2 moves from the first position to the second position, the inner wall of the sleeve 21 can press the second end 312 to drive the clamping member 31 to rotate, and the clamping assembly 3 switches from the open state to the closed state. That is, the position change of the sleeve 21 can drive the clamping assembly 3 to produce a corresponding state change. In this way, it can help maintain the consistency of the state of the locking assembly 2 and the clamping assembly 3, so as to facilitate the use of the lifting assembly.

[0066] In some embodiments, the sleeve 21 is provided with a first clearance hole 218, and when the locking assembly 2 is in the second position, the protrusion 3111 is located in the first clearance hole 218.

[0067] A first clearance hole 218 is provided in the sleeve 21. When the locking assembly 2 is in the second position, the protrusion 3111 is located in the first clearance hole 218. At this time, the sleeve 21 will not squeeze the protrusion 3111, that is, the sleeve 21 will not squeeze the protrusion 3111 and the second end 312 at the same time, so that the clamping assembly 3 can flexibly switch between the open state and the closed state under the drive of the sleeve 21.

[0068] In other embodiments, the clamping assembly 3 further includes an elastic element, the two ends of which are connected to the rod 1 and the clamping member 31, respectively. The elastic force of the elastic element is used to drive the second end 312 away from the central axis of the rod 1. When the locking assembly 2 is in the second position, the locking assembly 2 can overcome the elastic force of the elastic element to keep the clamping assembly 3 in a closed state.

[0069] It should be noted that the elastic element can be a torsion spring, a spring, etc. For example, when the elastic element is a torsion spring, the elastic element can be sleeved on the outer periphery of the rotating shaft 33.

[0070] In this embodiment, when the locking assembly 2 switches from the second position to the first position, the elastic force of the elastic element drives the second end 312 away from the central axis of the rod body 1, so that the clamping assembly 3 can switch from the closed state to the open state. The elastic element connects the rod body 1 and the clamping component 31 at both ends. The elastic force of the elastic element can drive the second end 312 away from the central axis of the rod body 1. When the locking assembly 2 is in the first position, the claw hook 3121 can automatically move away from the drive rod 300, making it easier for the clamping assembly 3 to open. This facilitates the separation of the lifting device 400 from the drive rod 300 and allows for installation, disassembly, and position adjustment. When the locking assembly 2 is in the second position, it can overcome the elastic force of the elastic element to keep the clamping assembly 3 closed. At this time, the elastic force of the elastic element can cause the second end 312 to abut against the sleeve 21, forming frictional resistance. This reduces the risk of accidental movement of the locking assembly 2 or accidental opening of the clamping assembly 3 caused by external vibrations or shaking, ensuring that the drive rod 300 is stably clamped and ensuring safe and reliable lifting. In addition, during the closing or opening process of the clamping assembly 3, the elastic element can also play a buffering role, reducing collisions and impacts between components, reducing wear and damage risks, extending the service life of the device, and reducing noise generation.

[0071] Reference Figure 5 The rod body 1 is provided with at least one first handle 16 on its outer periphery, and the locking assembly 2 is provided with at least one second handle 22. The first handle 16 and the second handle 22 are used to apply external force to switch the locking assembly 2 between a first position and a second position.

[0072] Workers can hold the first handle 16 to fix the rod 1 while simultaneously manipulating the second handle 22 to move the locking assembly 2. This eliminates the need for additional tools, simplifying the operation and making state switching more direct and efficient. This is particularly beneficial in space-constrained nuclear reactor environments, significantly improving operational flexibility. The design of the first handle 16 and the second handle 22 increases the radius of force application. Based on the lever principle, this effectively reduces the external force required to switch the position of the locking assembly 2, making operation more effortless. When multiple people are needed to switch the state of the hoisting device 400, the first handle 16 and the second handle 22 can be operated by different personnel, achieving synchronized coordination between fixing the rod 1 and moving the locking assembly 2, reducing operational errors and improving teamwork coordination.

[0073] In some embodiments, the first handle 16 and the rod 1 can be welded together, while in other embodiments, the first handle 16 and the rod 1 can be threaded together.

[0074] In some embodiments, the second handle 22 and the sleeve 21 can be welded together, while in other embodiments, the second handle 22 and the sleeve 21 can be threaded together.

[0075] In some embodiments, two first handles 16 are provided on the outer periphery of the rod body 1, and the two first handles 16 are spaced apart along the length direction of the rod body 1. The locking assembly 2 is provided with two second handles 22, and the two second handles 22 are spaced apart along the length direction of the rod body 1. In this assembly, a first handle 16 and a second handle 22 that are close together form a first component 51. The distance between the first handle 16 and the second handle 22 within the first component 51 can be 100mm to 120mm (for example, it can be 100mm, 102mm, 104mm, 106mm, 108mm, 110mm, 112mm, 114mm, 116mm, 118mm, or 120mm). The remaining first handle 16 and the second handle 22 form a second component 52. The distance between the first handle 16 and the second handle 22 within the second component 52 can also be 100mm to 120mm (for example, it can be 100mm, 102mm, 104mm, 106mm, 108mm, 110mm, 112mm, 114mm, 116mm, 118mm, or 120mm).

[0076] In this embodiment, the hoisted drive rod 300 is stored on a temporary storage rack in the component pool. Since the head elevation of the drive rod 300 is nearly 2970mm higher than that of the component in the upper stack and the temporary storage rack, two first handles 16 and two second handles 22 of different heights are designed to facilitate the operation of the hoisting device 400 by the staff standing on the hoisting platform 200.

[0077] Reference Figure 5In (a), when the hoisting device 400 is in a low position ready to hoist the drive rod 300 inside the reactor, the distance between the first component 51 and the hoisting platform 200 can be 700mm to 720mm (exemplary values ​​are 700mm, 702mm, 704mm, 706mm, 708mm, 710mm, 712mm, 714mm, 716mm, 718mm, and 720mm). At this time, the operator can control the relative position of the sleeve 21 and the claw hook 3121 by using the first handle 16 and the second handle 22 to operate the first component 51, so that the clamping component 3 can be connected to the drive rod 300. (See reference...) Figure 5 In (b), when the hoisting device 400 is in a high position to store the hoisted drive rod 300 into the storage rack, the operator can control the relative position of the sleeve 21 and the claw hook 3121 from the first handle 16 and the second handle 22 of the control second component 52 so that the clamping component 3 can be separated from the drive rod 300.

[0078] In this embodiment, the hoisting device 400 also includes a weighing device connected to the rod 1, which is used to weigh the weight of the drive rod 300.

[0079] It should be noted that in some embodiments, the weighing device can be located at the end of the rod 1 away from the clamping assembly 3. In this case, the two ends of the weighing device can be connected to the rod 1 and the hook respectively, and the weighing device can weigh the total weight of the rod 1, the clamping assembly 3, and the drive rod 300. In other embodiments, the weighing device can also be located between the rod 1 and the clamping assembly 3. In this case, the weighing device can weigh the total weight of the clamping assembly 3 and the drive rod 300. The weighing device can be an electronic scale, a spring scale, etc.

[0080] During the hoisting process, the reading on the weighing device can be used to determine whether the hoisting device 400 is connected to the drive rod 300. For example, when the reading on the weighing device is lower than the preset value, the hoisting device 400 is not connected to the drive rod 300; when the reading on the weighing device is higher than the preset value, the hoisting device 400 is connected to the drive rod 300.

[0081] In some embodiments, the weighing device is located at the end of the rod 1 opposite to the clamping assembly 3. The weight of the drive rod 300 is 60 kg, and the weight of the rod 1 and the clamping assembly 3 is 56 kg. In some embodiments, the weighing device displays the actual weight it weighs; therefore, when the clamping assembly 3 is connected to the drive rod 300, the weighing device reading is 116 kg. In other embodiments, the weighing device displays the relative weight it weighs; therefore, when the clamping assembly 3 is connected to the drive rod 300, the weighing device reading is 60 kg. That is, the weighing device reading can be between 60 kg and 116 kg. When the weighing device reading is too low, it can be determined that the clamping assembly 3 and the drive rod 300 are not properly connected; when the weighing device reading is too high, it can be determined that the drive rod 300 may be caught by other components, affecting its movement.

[0082] In the embodiments of this application, participants Figure 2 The hoisting device 400 also includes a lifting ring assembly 4, which is located at the end of the rod 1 away from the clamping assembly 3. The lifting ring assembly 4 can be connected to the hook of the crane 100 to facilitate hoisting.

[0083] The lifting eye assembly 4 includes a lifting eye body 41, a mounting plate 42, two nuts 43, and two cotter pins 44. The lifting eye body 41 is C-shaped, and the mounting plate 42 has two mounting holes. Both ends of the lifting eye body 41 pass through the two mounting holes and are threaded to the nuts 43. The cotter pins 44 can be set at the ends of the lifting eye body 41 and abut against the nuts 43 to restrict the rotation of the nuts 43.

[0084] In this embodiment, the clamping assembly 3 includes three clamping members 31, which are evenly spaced around the central axis of the rod 1, with adjacent clamping members 31 forming a 120° central angle with the center of the rod 1. Each of the three clamping members 31 has a claw hook 3121 at its second end 312. The clamping assembly 3 also includes three rotating shafts 33, with the first ends 311 of the three clamping members 31 rotatably mounted on the tube 14 via the three rotating shafts 33. The tube 14 is fixed to the end of the rod 1 by four pins. Furthermore, the tube 14 can be welded to the rod 1 to improve the stability of the connection.

[0085] In this embodiment, the sleeve 21 may include a first sleeve segment 211, a first connector 213, a movable sleeve 215, a second connector 214, a second sleeve segment 212, and a locking sleeve 216. The first sleeve segment 211 and the first connector 213 are welded together. The first connector 213 is threaded to the movable sleeve 215. The movable sleeve 215 is threaded to the second connector 214. The second connector 214 is welded to the second sleeve segment 212. The second sleeve segment 212 is welded to the locking sleeve 216. The locking sleeve 216 can abut against the clamping member 31 to drive the clamping assembly 3 to open and close. The diameter of the first sleeve segment 211 and the second sleeve segment 212 may be 51 mm, and the length may be 1.5 m. Two second handles 22 may be respectively disposed on the first sleeve segment 211 and the second sleeve segment 212.

[0086] In this embodiment, the rod 1 includes a first rod segment 11, a second rod segment 12, and a third joint 13 connecting the first rod segment 11 and the second rod segment 12.

[0087] When the lifting device 400 needs to be disassembled after initial assembly and use on site, simply use a wrench to loosen the movable sleeve 215 to separate the first cylinder segment 211 and the second cylinder segment 212; then disengage the third joint 13 of the rod body 1. Conversely, when installing the long-handled grabber, first connect the first cylinder segment 11 and the second cylinder segment 12, then connect the first cylinder segment 211 and the second cylinder segment 212 using the movable sleeve 215. This completes the disassembly and installation of the lifting device 400.

[0088] The lifting device 400 provided in this embodiment drives the sleeve 21 upward via the second handle 22, causing the three clamping members 31 to open. At this time, the lifting device 400 is aligned with the head of the drive rod 300 and moved downward to place it on the step at the head of the drive rod 300. Then, the second handle 22 is released, and the sleeve 21 moves downward under its own weight. The three clamping members 31 are squeezed and rotated by the sleeve 21, swinging into the annular groove at the head of the drive rod 300. Because the sleeve 21 moves downward under its own weight, it ensures that the claw hook 3121 is in a closed state when no external force is applied. Therefore, when the lifting device 400 drives the drive rod 300, the claw hook 3121 is always in a closed, safe state, making the operation safe and reliable.

[0089] When the drive rod 300 is hoisted to the storage position, the crane 100 can be lowered so that the drive rod 300 is inserted into and falls into the corresponding temporary storage rack. At this time, the operator can operate the second handle 22 to move the sleeve 21 upward, thereby driving the three closed claw hooks 3121 to open outward and disengage from the drive rod 300. By continuously holding the second handle 22, the crane 100 raises the lifting device 400 by about 120mm. Then, the second handle 22 is released, and the sleeve 21 falls under its own weight, and the clamping assembly 3 returns to the closed state. At this point, the removal of the drive rod 300 is completed.

[0090] The reinstallation of the drive rod 300 can be performed in reverse order. After the crane 100 moves with the lifting device 400 and the drive rod 300 and aligns with the corresponding control rod guide tube position of the upper stack component, it falls. The second handle 22 is operated to move the sleeve 21 upward, and the drive claw hook 3121 opens outward, disengaging the lifting device 400 from the drive rod 300. Then, the lifting device 400 is lifted so that the claw hook 3121 disengages from the drive rod 300, and the second handle 22 is released. The sleeve 21 falls under its own weight, and the clamping assembly 3 returns to the closed state.

[0091] In some embodiments, the hoisting device 400 may be used in accordance with the following steps:

[0092] S100. Connect the weighing device to the crane 100, and then connect the weighing device to the end of the rod 1 away from the clamping assembly 3.

[0093] S200, the hoisting device 400 is moved by the crane 100 so that the clamping assembly 3 is aligned with the end of the drive rod 300 to be gripped.

[0094] S300, Push the second handle 22 to move the sleeve 21 upward, thereby putting the clamping assembly 3 in the open state;

[0095] S400: Lower the hoisting device 400 until the weighing scale reading is zero. At this point, the hoisting device 400 is positioned above the head of the drive rod 300.

[0096] S500, release the second handle 22, the sleeve 21 falls by its own weight, driving the three claw hooks 3121 to swing into the groove 3001 at the head of the drive rod 300, and the clamping assembly 3 is connected to the drive rod 300.

[0097] S600, the hoisting device 400 is lifted by the crane 100, and the drive rod 300 is lifted accordingly. Check the reading of the weighing device. When the change of the weighing device reading is observed to be within the range, it can be confirmed that the clamping assembly 3 and the drive rod 300 are well connected and the bottom of the drive rod 300 is not caught by other parts.

[0098] S700: The hoisting device 400 and the drive rod 300 are moved to the designated position of the storage rack by the crane 100, and then slowly lowered so that the drive rod 300 enters the storage rack position until the weight display of the weighing device is zero.

[0099] S800, push the second handle 22 to move the sleeve 21 upward, which will cause the three claw hooks 3121 to open. The hoisting device 400 will be lifted by the crane 100 by about 120mm. Then release the second handle 22. At this time, the sleeve 21 will fall by its own weight, and the claw hooks 3121 will return to the closed state.

[0100] The above are merely preferred embodiments of this application and are 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 hoisting device for a nuclear reactor control rod drive rod, characterized in that, include: Rod body; A clamping assembly is disposed at the end of the rod body. The clamping assembly includes a plurality of claw hooks, which are arranged at intervals around the central axis of the rod body and are movably connected to the rod body. When the clamping assembly is closed, the plurality of claw hooks converge toward the central axis of the rod body to clamp the drive rod. When the clamping assembly is open, the plurality of claw hooks move away from the central axis of the rod body to be able to separate from the drive rod. The locking assembly has a first position and a second position. When the locking assembly is in the first position, it avoids the claw hook to allow the clamping assembly to be in the open state. When the locking assembly moves relative to the rod from the first position to the second position, it can connect with the claw hook to allow the clamping assembly to switch from the open state to the closed state. When the nuclear reactor control rod drive rod hoisting device is in the hoisting state, the locking assembly can be held in the second position under the action of gravity.

2. The nuclear reactor control rod drive rod hoisting device as described in claim 1, characterized in that, The locking assembly includes a sleeve fitted around the outer periphery of the rod. The sleeve is movable relative to the rod. When the locking assembly is in the first position, the sleeve avoids the pawl hook, causing the pawl hook to move away from the central axis of the rod. When the locking assembly moves to the second position, the inner wall of the sleeve can compress the pawl hook to rotate, driving the pawl hook to move closer to the central axis of the rod, so that the pawl hook can be connected to the drive rod.

3. The nuclear reactor control rod drive rod hoisting device as described in claim 2, characterized in that, One of the sleeve and the rod is provided with a limiting groove, the length of which extends along the length direction of the rod. The other of the sleeve and the rod is provided with a limiting member that slides into the limiting groove, so that the sleeve slides along the length direction of the rod.

4. The nuclear reactor control rod drive rod hoisting device as described in claim 2 or 3, characterized in that, The clamping assembly includes at least two clamping members, all of which are arranged at intervals around the central axis of the rod. Each clamping member has a first end and a second end that are disposed opposite to each other. The first end is rotatably connected to the rod. The claw hooks correspond one-to-one with the clamping members and are disposed on the side of the second end facing the central axis of the rod. When the locking assembly is in the first position, the second end is away from the central axis of the rod, and the sleeve avoids the second end. When the locking assembly moves to the second position, the inner wall of the sleeve can squeeze the second end to drive the claw hooks closer to the central axis of the rod.

5. The nuclear reactor control rod drive rod hoisting device as described in claim 4, characterized in that, One end of the rod is provided with a tube, the central hollow area of ​​the tube is used to accommodate the drive rod, the side wall of the tube is provided with a connecting hole communicating with the central hollow area of ​​the tube, and the clamping member is disposed in the connecting hole.

6. The nuclear reactor control rod drive rod hoisting device as described in claim 5, characterized in that, The opening at the end of the tube opposite to the rod is trumpet-shaped.

7. The nuclear reactor control rod drive rod hoisting device as described in claim 5, characterized in that, The tube body is provided with a limiting surface, which is used to abut against the end face of the drive rod.

8. The nuclear reactor control rod drive rod hoisting device as described in claim 4, characterized in that, The clamping member is rotatably connected to the rod body via a rotating shaft. A protrusion is provided on the side of the first end. The protrusion is located on the side of the rotating shaft away from the second end. When the locking assembly is switched from the second position to the first position, the inner wall of the sleeve can squeeze the protrusion to drive the clamping member to rotate, so that the claw hook is away from the central axis of the rod body. The sleeve is provided with a first clearance hole, and when the lock assembly is in the second position, the protrusion is located in the first clearance hole.

9. The nuclear reactor control rod drive rod hoisting device as described in claim 4, characterized in that, The clamping assembly further includes an elastic element, the two ends of which are respectively connected to the rod and the clamping member. The elastic force of the elastic element is used to drive the second end away from the central axis of the rod. When the locking assembly is in the second position, the locking assembly can overcome the elastic force of the elastic element to keep the clamping assembly in the closed state.

10. The nuclear reactor control rod drive rod hoisting device according to any one of claims 1-3, characterized in that, The rod body is provided with at least one first handle on its outer periphery, and the locking assembly is provided with at least one second handle. The first handle and the second handle are used to apply external force to switch the locking assembly between the first position and the second position.

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