A nuclear power plant radioactive filter hoisting clamp

Abstract

The utility model discloses a kind of nuclear power plant radioactive filter element hoisting tongs, including the first end of telescopic transmission mechanism is connected with driving mechanism, the second end of telescopic transmission mechanism is drivingly connected with clamping mechanism;Clamping mechanism includes fixed frame, drive shaft and variable-diameter execution component, drive shaft is fixedly connected with the second end of telescopic transmission mechanism, and is matched with the clearance of fixed frame;Variable-diameter execution component includes at least one variable-diameter drive part, at least two clamping arms and the same number of transmission member as clamping arm, variable-diameter drive part is fixed on drive shaft, and its outer contour radial dimension is continuously changed along the axial direction of drive shaft;Every clamping arm is hinged with fixed frame by transmission member, and transmission member and the outer contour of variable-diameter drive part keep contact;Locking mechanism is connected with fixed frame and drive shaft, to lock the axial direction of drive shaft relative to fixed frame. Telescopic transmission mechanism transmits driving force to clamping mechanism, and clamping mechanism can realize the capture and release of filter core.

Description

Technical Field

[0001] This utility model relates to the field of nuclear power plant maintenance tools, and in particular to a nuclear power plant radioactive filter element hoisting clamp. Background Technology

[0002] In nuclear power plants, the installation and replacement of filter cartridges is a routine but risky operation. Currently, traditional filter cartridge lifting clamps are commonly used. These tools typically use a linkage mechanism to control the gripper to open within the filter cartridge's pores by pulling up the upper handle.

[0003] However, existing technologies have significant drawbacks: First, the length is not adjustable, posing a high risk to human factors: Traditional clamps have a fixed length and cannot be adapted to operators of different heights or filters at different ground heights. Height mismatch can easily lead to improper operating postures, increasing the risk of filter cartridge detachment, equipment damage, and even radioactive contamination.

[0004] Second, high procurement costs: To solve the installation problem of filters of different heights, power plants need to purchase clamps of various specifications and lengths, resulting in wasted budget. Third, excessive tool weight: Traditional clamps often have an external support shell added to protect the connecting rod, resulting in a large overall weight. Combined with the weight of the filter element, this further increases the burden on operators and the probability of human error. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a hoisting clamp for radioactive filter elements in nuclear power plants.

[0006] The technical solution adopted by this utility model to solve its technical problem is: to construct a nuclear power plant radioactive filter element hoisting clamp, including a driving mechanism, a telescopic transmission mechanism, a clamping mechanism and a locking mechanism, wherein the first end of the telescopic transmission mechanism is connected to the driving mechanism, and the second end of the telescopic transmission mechanism is connected to the clamping mechanism in a transmission connection. The clamping mechanism includes a fixed frame, a drive shaft, and a variable diameter actuator. The drive shaft is fixedly connected to the second end of the telescopic transmission mechanism and is clearance-fitted with the fixed frame. The variable diameter actuator includes at least one variable diameter drive unit, at least two clamping arms, and a number of transmission members equal to the number of clamping arms. The variable diameter drive unit is fixed to the drive shaft, and the radial dimension of the outer contour of the variable diameter drive unit changes continuously along the axial direction of the drive shaft. Each clamping arm is hinged to the fixed frame through the transmission member, and the transmission member maintains contact with the outer contour of the variable diameter drive unit. The locking mechanism is connected to the fixed frame and the drive shaft to lock the drive shaft axially relative to the fixed frame.

[0007] Furthermore, the drive mechanism includes a housing, a main grip, an elastic reset member, and a secondary grip. The main grip is fixed to one end of the housing, and the secondary grip is slidably disposed on the housing and connected to the first end of the telescopic transmission mechanism. The elastic reset member acts between the housing and the secondary grip to provide an elastic force that resets the secondary grip.

[0008] Furthermore, the telescopic transmission mechanism includes a first telescopic rod, a positioning sleeve, and a second telescopic rod connected in sequence. The first telescopic rod is fixedly connected to the auxiliary grip, and the second telescopic rod is fixedly connected to the drive shaft.

[0009] Furthermore, the housing is provided with a guide slide and a guide hole communicating with the guide slide. The secondary grip is slidably disposed in the guide slide, and the first telescopic rod passes through the guide hole and is connected to the secondary grip.

[0010] Furthermore, the locking mechanism includes at least one locking member, which is fixed to the drive shaft or the second telescopic rod; The fixed frame includes a connector, a first limiting ring and a second limiting ring that are spaced apart and fixedly connected along the axial direction of the connector. The first limiting ring has a first limiting groove and a first locking channel communicating with the side of the first limiting groove. The second limiting ring has a second limiting groove and a second locking channel communicating with the side of the second limiting groove. The openings of the first limiting groove and the second limiting groove are arranged opposite to each other. The locking element engages and limits the locking position with the first locking channel or the second locking channel.

[0011] Furthermore, the locking element is a pin fixed to the drive shaft, and the axial height of the first locking channel and the second locking channel is adapted to the diameter of the pin.

[0012] Furthermore, the variable diameter drive unit is a tapered sleeve fixedly sleeved on the drive shaft, with the small end of the tapered sleeve facing the telescopic transmission mechanism; Alternatively, the variable diameter drive unit may consist of several variable diameter bars, each of which is fixedly connected to the drive shaft, with the shorter end of the variable diameter bar facing the telescopic transmission mechanism.

[0013] Furthermore, the transmission component includes a transmission rod and a contact portion. The transmission rod is hinged to the fixed frame via a pin, and a first end of the transmission rod is fixedly connected to one end of the clamping arm. The second end of the transmission rod is connected to the contact portion, and the contact portion is in contact with the surface of the variable diameter drive portion.

[0014] Furthermore, the elastic reset element is a spring.

[0015] Furthermore, the outer wall of the clamping arm is provided with arc-shaped protrusions and / or anti-slip textures that are adapted to the outer contour of the radioactive filter element.

[0016] By implementing this utility model, the following beneficial effects can be achieved: This utility model relates to a nuclear power plant radioactive filter cartridge lifting clamp. A drive mechanism provides manual or power input, while a telescopic transmission mechanism transmits the driving force to the clamping mechanism, allowing for flexible adjustment of the overall tool length. A locking mechanism rigidly locks the relative position of the drive shaft and the fixed frame after the clamping or releasing action is completed, ensuring absolute reliability of the clamping state. When the clamping mechanism moves axially under the drive of the telescopic transmission mechanism via the drive shaft, the variable-diameter drive unit moves synchronously, converting the axial movement of the drive shaft into the radial opening and closing motion of the clamping arm, thus achieving the gripping and releasing of the filter cartridge. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1 This is a schematic diagram of the structure of a nuclear power plant radioactive filter cartridge hoisting clamp according to one embodiment of the present invention; Figure 2 yes Figure 1 A first-view structural diagram of the clamping mechanism in the image; Figure 3 yes Figure 2 A second-view structural diagram of the clamping mechanism in the middle; Figure 4 yes Figure 2 A top view of the clamping mechanism in the middle; Figure 5 yes Figure 4 Sectional view along line AA in the middle; Figure 6 yes Figure 1 A schematic diagram of the drive mechanism in the diagram; Figure 7 yes Figure 1 A schematic diagram of the telescopic transmission mechanism in the diagram. Detailed Implementation

[0018] 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.

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0020] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or a chemical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] See Figures 1 to 7 One embodiment of this utility model discloses a hoisting clamp for radioactive filter cartridges in nuclear power plants, comprising a drive mechanism 1, a telescopic transmission mechanism 2, a clamping mechanism 3, and a locking mechanism 4. The first end of the telescopic transmission mechanism 2 is connected to the drive mechanism 1, and the second end of the telescopic transmission mechanism 2 is drively connected to the clamping mechanism 3. The drive mechanism 1 provides manual or power input. The telescopic transmission mechanism 2 transmits the driving force to the clamping mechanism 3 and enables flexible adjustment of the overall tool length, fundamentally solving the problem of fixed tool length in the prior art.

[0023] like Figures 2 to 5 As shown, the clamping mechanism 3 includes a fixed frame 31, a drive shaft 32, and a variable diameter actuation assembly 33. The drive shaft 32 is fixedly connected to the second end of the telescopic transmission mechanism 2 and is clearance-fitted with the fixed frame 31. The variable diameter actuation assembly 33 includes at least one variable diameter drive part 331, at least two clamping arms 332, and a number of transmission members 333 equal to the number of clamping arms 332. The variable diameter drive part 331 is fixed to the drive shaft 32, and the radial dimension of the outer contour of the variable diameter drive part 331 changes continuously along the axial direction of the drive shaft 32. Each clamping arm 332 is hinged to the fixed frame 31 through the transmission member 333, and the transmission member 333 maintains contact with the outer contour of the variable diameter drive part 331.

[0024] The working mechanism of the clamping mechanism 3 is as follows: when the drive shaft 32 moves axially under the drive of the telescopic transmission mechanism 2, the variable diameter drive part 331 fixed on it moves synchronously. Because the outer contour dimension of the variable diameter drive part 331 changes continuously, it squeezes or releases the transmission member 333 that is in contact with it. The transmission member 333 acts as a lever, rotating around its hinge point on the fixed frame 31, thereby converting the axial movement of the drive shaft 32 into the radial opening and closing movement of the clamping arm 332, realizing the gripping and release of the filter element.

[0025] The locking mechanism 4 is connected to the fixed frame 31 and the drive shaft 32 to axially lock the drive shaft 32 relative to the fixed frame 31. After the clamping or releasing action is in place, the locking mechanism 4 rigidly locks the relative position of the drive shaft 32 and the fixed frame 31, thereby ensuring the absolute reliability of the clamping state and preventing the filter element from falling off due to accidental loosening during hoisting, which greatly improves the safety of operation.

[0026] Furthermore, such as Figure 6 As shown, in some embodiments, the drive mechanism 1 includes a housing 11, a main grip 12, an elastic reset member 13, and a secondary grip 14. The main grip 12 is fixed to one end of the housing 11, and the secondary grip 14 is slidably disposed on the housing 11 and connected to the first end of the telescopic transmission mechanism 2. The elastic reset member 13 acts between the housing 11 and the secondary grip 14 to provide an elastic force to reset the secondary grip 14.

[0027] The drive mechanism 1 is manually operated. The operator holds the main handle 12 and the secondary handle 14, and by squeezing, the secondary handle 14 slides on the housing 11, thereby directly pulling the telescopic transmission mechanism 2. The operation is intuitive and effortless. The elastic reset element 13, for example, is a spring, which is compressed during the squeezing action. When the hand is released, the restoring force of the elastic reset element 13 automatically pushes the secondary handle 14 back to its initial position, thereby achieving automatic reset of the clamping mechanism 3, preparing for the next operation, and improving operational efficiency and smoothness.

[0028] Furthermore, such as Figure 7 As shown, in some embodiments, the telescopic transmission mechanism 2 includes a first telescopic rod 21, a positioning sleeve 22, and a second telescopic rod 23 connected in sequence. The first telescopic rod 21 is fixedly connected to the auxiliary handle 14, and the second telescopic rod 23 is fixedly connected to the drive shaft 32.

[0029] The telescopic transmission mechanism 2 realizes the core telescopic function. The first telescopic rod 21 is linked to the drive mechanism 1, and the second telescopic rod 23 is linked to the clamping mechanism 3. The positioning sleeve 22 is used to connect the two telescopic rods and ensure their coaxiality and force transmission stability. By changing the overlap length of the first telescopic rod 21 and the second telescopic rod 23 within the positioning sleeve 22, the total length of the entire clamp can be infinitely adjusted, perfectly adapting to the needs of different heights and installation heights, realizing multi-purpose use of one clamp, and significantly saving procurement costs.

[0030] Furthermore, in some embodiments, the housing 11 is provided with a guide slide and a guide hole communicating with the guide slide. The secondary grip 14 is slidably disposed in the guide slide, and the first telescopic rod 21 passes through the guide hole and is connected to the secondary grip 14. The guide slide and guide hole are obscured and are not shown in the figures.

[0031] The guide rail provides a precise trajectory for the sliding of the secondary grip 14, ensuring that the force is always transmitted axially and avoiding jamming and uneven loading. The guide hole guides and supports the first telescopic rod 21, ensuring its smooth movement and further improving the rigidity and reliability of the entire transmission system.

[0032] Furthermore, such as Figures 2 to 5 As shown, in some embodiments, the locking mechanism 4 includes at least one locking member 41, which is fixed to the drive shaft 32 or the second telescopic rod 23. The fixed frame 31 includes a connecting member 311, a first limiting ring 312 and a second limiting ring 313 that are axially spaced and fixedly connected to the connecting member 311. The first limiting ring 312 has a first limiting groove 3121 and a first locking channel 3122 communicating with the side of the first limiting groove 3121. The second limiting ring 313 has a second limiting groove 3131 and a second locking channel 3132 communicating with the side of the second limiting groove 3131. The openings of the first limiting groove 3121 and the second limiting groove 3131 are opposite to each other. The locking member 41 engages with the first locking channel 3122 or the second locking channel 3132 for limiting.

[0033] When the drive shaft 32 drives the locking element 41, such as a pin, to move axially until it aligns with the first limiting groove 3121 or the second limiting groove 3131, rotating the drive shaft 32 allows the locking element 41 to enter the locking channels (first locking channel 3122, second locking channel 3132) from the limiting grooves (including the first limiting groove 3121 and the second limiting groove 3131). At this time, due to the obstruction of the end face of the limiting groove, the locking element 41 cannot move axially, thus achieving axial locking between the drive shaft 32 and the fixed frame 31 (via the first limiting ring 312 and the second limiting ring 313). This locking method requires no additional tools, is quick and intuitive to operate, and the locking status is clear and reliable (it can be judged by touch or vision whether it is locked), making it very suitable for use in environments with extremely high safety requirements, such as nuclear power plants.

[0034] Furthermore, in some embodiments, the locking member 41 is a pin fixed on the drive shaft 32, and the axial height of the first locking channel 3122 and the second locking channel 3132 is adapted to the diameter of the pin.

[0035] Using a pin as the locking element 41 results in a simple structure, low manufacturing cost, and high strength. The heights of the first locking channel 3122 and the second locking channel 3132 are respectively matched with the diameter of the pin, meaning that the two are in a small clearance fit. This ensures that the pin passes smoothly and effectively eliminates axial movement, ensuring that the clamping force does not decrease in the locked state and that the hoisting process is absolutely safe.

[0036] Furthermore, in some embodiments, the variable diameter drive unit 331 is a tapered sleeve fixedly sleeved on the drive shaft 32, with the small end of the tapered sleeve facing the telescopic transmission mechanism 2.

[0037] When the drive shaft 32 pulls the tapered sleeve (small end facing backward) backward, the tapered surface of the sleeve presses against the transmission component 333, forcing it to rotate and push the clamping arm 332 outward, thus clamping the filter element holes, i.e., the outer surface of the clamping arm 332 abuts against the inner wall of the filter element holes. Conversely, when the tapered sleeve is pushed forward, the transmission component 333 slides along the tapered surface towards the small end under the action of the restoring force, and the clamping arm 332 retracts inward, i.e., releasing the inner wall of the filter element holes. This design can provide continuous and stable clamping force.

[0038] Or, such as Figure 2 and Figure 3 As shown, in some other embodiments, the variable diameter drive unit 331 consists of several variable diameter bars, each of which is fixedly connected to the drive shaft 32, with the lower end of the variable diameter bar facing the telescopic transmission mechanism 2.

[0039] The variable diameter strip is a lightweight and low-cost variant of the tapered sleeve. Its working mechanism is the same as the tapered sleeve, but it achieves variable diameter through a discrete strip structure, reducing weight while maintaining functionality, thus meeting the lightweight objective of this invention.

[0040] Furthermore, such as Figure 3 As shown, in some other embodiments, the transmission component 333 includes a transmission rod 3331 and a contact portion 3332. The transmission rod 3331 is hinged to the fixed frame 31 by a pin, and the first end of the transmission rod 3331 is fixedly connected to one end of the clamping arm 332. The second end of the transmission rod 3331 is connected to the contact portion 3332, and the contact portion 3332 is in contact with the surface of the variable diameter drive portion 331.

[0041] The transmission component 333 utilizes the lever principle. The transmission rod 3331 is the lever body, and the hinge point is the fulcrum. Specifically, the transmission component 333 is hinged to the connecting member 311. The contact part 3332, which can be a smooth end or a roller, is the point of force and contacts the variable diameter drive part 331. The end connected to the clamping arm 332 is the point of contact. When the contact part 3332 is pushed outward by the variable diameter drive part 331, the transmission rod 3331 rotates around the fulcrum, and its point of contact drives the clamping arm 332 to retract inward, thus releasing the filter element holes. Conversely, it opens outward, thus clamping the filter element holes. This lever mechanism amplifies the force, making operation more effortless.

[0042] Furthermore, the outer wall of the clamping arm 332 is provided with arc-shaped protrusions and / or anti-slip textures that conform to the outer contour of the radioactive filter element. The arc-shaped protrusions increase the contact area between the clamping arm 332 and the inner wall of the filter element, making the pressure distribution more uniform, avoiding stress concentration that could damage the filter element, and also providing a certain degree of self-centering. Anti-slip textures, such as knurling or rubber coatings, significantly increase the coefficient of friction, preventing relative sliding or rotation between the filter element and the clamps during hoisting, further improving the reliability and safety of the gripping.

[0043] The working process of this utility model's nuclear power plant radioactive filter element hoisting clamp is as follows: (1) Length adjustment: The operator pulls out or pushes in the first telescopic rod 21 and the second telescopic rod 23 according to his own height and the height of the filter, and adjusts them to the appropriate length.

[0044] (2) Clamping and locking: The operator pinches the main handle 12 and the auxiliary handle 14 to compress the spring, which drives the drive shaft 32 and the variable diameter drive part 331 to move backward through the telescopic transmission mechanism 2. The variable diameter drive part 331 presses the contact part 3332 of the transmission component 333, causing the transmission rod 3331 to rotate and push the clamping arm 332 to retract radially, thus forming a clamping state. When the locking member 41 moves to the first limiting groove 3121 of the first limiting ring 312, the entire drive mechanism 1 is rotated, causing the locking member 41 to slide into the first locking channel 3122, thereby achieving axial locking.

[0045] (3) Insert the filter element: Insert the clamp head, which is in a clamped and locked state, into the hole at the top of the filter element.

[0046] (4) Release and self-locking: Rotate the drive mechanism 1 in the opposite direction to return the locking member 41 from the first locking channel 3122 back to the first limiting groove 3121. Slowly release the auxiliary handle 14. Under the action of the spring return force, the drive shaft 32 moves forward, the telescopic transmission mechanism 2 releases the transmission component 333, and the clamping arm 332 opens radially under the reaction force of the filter element hole wall, forming a self-locking mechanism. Rotate the drive mechanism 1 again to engage the pin from the second limiting groove 3131 of the second limiting ring 313 into the second locking channel 3132, locking the released state. At this time, the filter element can be safely hoisted.

[0047] (5) Installation complete: After the filter element is delivered to the location, repeat steps 2 and 4 to release the filter element and complete the installation.

[0048] By implementing this utility model, the following beneficial effects can be achieved: This utility model relates to a nuclear power plant radioactive filter cartridge lifting clamp. A drive mechanism 1 provides manual or power input, while a telescopic transmission mechanism 2 transmits the driving force to the clamping mechanism 3, allowing for flexible adjustment of the overall tool length. A locking mechanism 4 rigidly locks the relative position of the drive shaft 32 and the fixed frame 31 after the clamping or releasing action is completed, ensuring absolute reliability of the clamping state. When the clamping mechanism 3 moves axially under the drive of the telescopic transmission mechanism 2 via the drive shaft 32, the variable-diameter drive unit 331 moves synchronously, converting the axial movement of the drive shaft 32 into the radial opening and closing movement of the clamping arm 332, thus achieving the gripping and releasing of the filter cartridge.

[0049] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that those skilled in the art can freely combine the above embodiments or technical features without departing from the concept of the present utility model, and can also make several modifications and improvements, all of which fall within the protection scope of the present utility model. That is, the embodiments described "in some embodiments" can be freely combined with any of the preceding and following embodiments. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should be covered by the claims of the present utility model.

Claims

1. A lifting clamp for radioactive filter cartridges in nuclear power plants, characterized in that, It includes a drive mechanism (1), a telescopic transmission mechanism (2), a clamping mechanism (3) and a locking mechanism (4). The first end of the telescopic transmission mechanism (2) is connected to the drive mechanism (1), and the second end of the telescopic transmission mechanism (2) is connected to the clamping mechanism (3). The clamping mechanism (3) includes a fixed frame (31), a drive shaft (32) and a variable diameter actuator (33). The drive shaft (32) is fixedly connected to the second end of the telescopic transmission mechanism (2) and is clearance-fitted with the fixed frame (31). The variable diameter actuator (33) includes at least one variable diameter drive unit (331), at least two clamping arms (332), and a number of transmission members (333) equal to the number of clamping arms (332). The variable diameter drive unit (331) is fixed to the drive shaft (32), and the radial dimension of the outer contour of the variable diameter drive unit (331) changes continuously along the axial direction of the drive shaft (32). Each clamping arm (332) is hinged to the fixed frame (31) through the transmission member (333), and the transmission member (333) maintains contact with the outer contour of the variable diameter drive unit (331). The locking mechanism (4) is connected to the fixed frame (31) and the drive shaft (32) to lock the drive shaft (32) axially relative to the fixed frame (31).

2. The nuclear power plant radioactive filter cartridge hoisting clamp according to claim 1, characterized in that, The drive mechanism (1) includes a housing (11), a main grip (12), an elastic reset member (13), and a secondary grip (14). The main grip (12) is fixed to one end of the housing (11), and the secondary grip (14) is slidably disposed on the housing (11) and connected to the first end of the telescopic transmission mechanism (2). The elastic reset member (13) acts between the housing (11) and the secondary grip (14) to provide an elastic force to reset the secondary grip (14).

3. The nuclear power plant radioactive filter cartridge hoisting clamp according to claim 2, characterized in that, The telescopic transmission mechanism (2) includes a first telescopic rod (21), a positioning sleeve (22), and a second telescopic rod (23) connected in sequence. The first telescopic rod (21) is fixedly connected to the auxiliary grip (14), and the second telescopic rod (23) is fixedly connected to the drive shaft (32).

4. The nuclear power plant radioactive filter cartridge hoisting clamp according to claim 3, characterized in that, The housing (11) is provided with a guide slide and a guide hole communicating with the guide slide. The secondary grip (14) is slidably disposed in the guide slide. The first telescopic rod (21) passes through the guide hole and is connected to the secondary grip (14).

5. The nuclear power plant radioactive filter cartridge hoisting clamp according to claim 3, characterized in that, The locking mechanism (4) includes at least one locking member (41), which is fixed to the drive shaft (32) or the second telescopic rod (23); The fixed frame (31) includes a connector (311), a first limiting ring (312) and a second limiting ring (313) that are axially spaced and fixedly connected to the connector (311). The first limiting ring (312) has a first limiting groove (3121) and a first locking channel (3122) that communicates with the side of the first limiting groove (3121). The second limiting ring (313) has a second limiting groove (3131) and a second locking channel (3132) that communicates with the side of the second limiting groove (3131). The openings of the first limiting groove (3121) and the second limiting groove (3131) are arranged opposite to each other. The locking member (41) engages with the first locking channel (3122) or the second locking channel (3132) for positioning.

6. The nuclear power plant radioactive filter cartridge hoisting clamp according to claim 5, characterized in that, The locking member (41) is a pin fixed on the drive shaft (32), and the axial height of the first locking channel (3122) and the second locking channel (3132) is adapted to the diameter of the pin.

7. The nuclear power plant radioactive filter cartridge hoisting clamp according to claim 1, characterized in that, The variable diameter drive unit (331) is a tapered sleeve fixedly sleeved on the drive shaft (32), with the small end of the tapered sleeve facing the telescopic transmission mechanism (2); Alternatively, the variable diameter drive unit (331) may be a plurality of variable diameter bars, each of which is fixedly connected to the drive shaft (32), with the lower end of the variable diameter bar facing the telescopic transmission mechanism (2).

8. The nuclear power plant radioactive filter cartridge hoisting clamp according to claim 7, characterized in that, The transmission component (333) includes a transmission rod (3331) and a contact portion (3332). The transmission rod (3331) is hinged to the fixed frame (31) by a pin. The first end of the transmission rod (3331) is fixedly connected to one end of the clamping arm (332). The second end of the transmission rod (3331) is connected to the contact portion (3332). The contact portion (3332) is in contact with the surface of the variable diameter drive unit (331).

9. The nuclear power plant radioactive filter cartridge hoisting clamp according to claim 2, characterized in that, The elastic reset element (13) is a spring.

10. The nuclear power plant radioactive filter cartridge hoisting clamp according to any one of claims 1 to 9, characterized in that, The outer wall of the clamping arm (332) is provided with arc-shaped protrusions and / or anti-slip textures that are adapted to the outer contour of the radioactive filter element.

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