Positioning mechanism and lifting device of nuclear power plant fuel assembly

Abstract

The utility model relates to the technical field of nuclear power plant fuel assembly fixing, in particular to a positioning mechanism and a lifting device of a nuclear power plant fuel assembly, and the positioning mechanism comprises a clamping assembly, a structural part, a clamping part arranged on one side of the structural part, a locking part arranged on the upper side of the clamping part, and a pressing assembly. Comprising a pressing part arranged on one side of a structural part, an extruding part arranged on one side of the pressing part and a shifting part arranged on one side of the structural part, and the clamping part comprises a fixing plate arranged on one side of the structural part and a clamping plate arranged on one side of the structural part in a sliding mode. According to the device, the fuel assembly of the nuclear power plant can be conveniently and rapidly clamped and positioned, dismounting tools such as a screwdriver are not needed in the clamping and positioning process, clamping and dismounting are convenient, and the repairing efficiency of the device is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fixing fuel assemblies of nuclear power plants, in particular to a positioning mechanism and a lifting device for fuel assemblies of nuclear power plants. Background Art

[0002] The fuel assembly is the core component of the nuclear power plant reactor, and its integrity is crucial to the safe operation of the reactor. Damaged fuel assemblies will cause the nuclear power plant to reduce power or even shut down, and increase the radiation dose of employees, seriously affecting the economic benefits and safety performance indicators of the nuclear power plant. Repairing damaged fuel assemblies that have not reached the burnup depth and replacing the damaged fuel rods before continuing to send them into the core for use can improve the efficiency of nuclear fuel use. During the fuel repair process, the fuel assembly needs to be fixed on the new fuel elevator to provide positioning and support for subsequent operating equipment. Existing equipment is difficult to quickly clamp and position the fuel assembly when placing it, which may cause the fuel assembly to slide and shake during the lifting and adjustment process, thereby affecting the repair efficiency of the fuel assembly. Utility Model Content

[0003] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0004] In view of the problem that it is difficult to quickly clamp and position the fuel assembly when placing it in the above-mentioned equipment, which may cause the fuel assembly to slide and shake during the lifting and adjustment process, thereby affecting the repair efficiency of the fuel assembly, the present utility model is proposed.

[0005] Therefore, the purpose of the utility model is to provide a positioning mechanism.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions: a positioning mechanism, comprising a clamping assembly, including a structural member, a clamping member arranged on one side of the structural member, and a locking member arranged on the upper side of the clamping member;

[0007] A pressing assembly, comprising a pressing member arranged on one side of the structural member, an extruding member arranged on one side of the pressing member, and a toggle member arranged on one side of the structural member;

[0008] The clamping member comprises a fixing plate arranged on one side of the structural member and a clamping plate slidably arranged on one side of the structural member.

[0009] As a preferred solution of the positioning mechanism of the utility model, the structural member includes a mounting plate, a first connecting plate arranged on one side of the mounting plate, a second connecting plate arranged on one side of the mounting plate and a mounting frame arranged on one side of the mounting plate.

[0010] As a preferred solution of the positioning mechanism of the utility model, the clamping member includes a threaded sleeve arranged on one side of the first connecting plate, a screw threadedly arranged on one side of the threaded sleeve, a movable plate rotatably arranged on one side of the screw, and a clamping plate arranged on one side of the movable plate.

[0011] As a preferred solution of the positioning mechanism of the utility model, wherein: the locking member includes a groove opened on the upper side of the movable plate, a locking plate slidably arranged in the groove, a locking block arranged on one side of the locking plate and a compression spring arranged inside the groove;

[0012] The locking member also includes a slide groove opened on one side of the installation frame, a slide rod arranged on the inner side of the slide groove, a lifting plate slidably arranged on the outer side of the slide rod, a wedge block arranged on one side of the lifting plate and a return spring sleeved on the outer side of the slide rod, and the wedge block extends into the gap between the locking blocks.

[0013] As a preferred solution of the positioning mechanism of the utility model, wherein: the pressing member includes a pressing plate slidably arranged in the installation frame, and a pressing block arranged inside the pressing plate;

[0014] The clamping member also includes a limiting groove opened on one side of the clamping plate, a horizontal groove arranged on one side of the limiting groove, an arc groove arranged on one side of the horizontal groove, and limiting rods arranged on both sides of the installation frame. The limiting rods extend into the limiting groove and are slidably arranged therewith.

[0015] As a preferred solution of the positioning mechanism of the utility model, the extrusion member includes a connecting strip arranged on one side of the clamping plate, a connecting rod arranged on one side of the connecting strip and an extrusion ball arranged on one side of the connecting rod, and the extrusion ball is in contact with the lifting plate.

[0016] As a preferred solution of the positioning mechanism described in the utility model, the toggle member includes a vertical plate arranged on the upper side of the mounting plate, a rotating rod rotatably arranged on one side of the vertical plate, an adjustment block arranged on the outside of the rotating rod, a rotating disk arranged on one side of the rotating rod, a toggle rod sleeved on the outside of the rotating rod, and an adjustment groove opened on the side wall of the clamping plate, and the toggle rod can partially extend into the adjustment groove during the rotation process.

[0017] As a preferred solution of the positioning mechanism of the utility model, the toggle member further includes a main spring arranged on one side of the second connecting plate, and two ends of the main spring are respectively connected to the side wall of the second connecting plate and the side wall of the clamping plate.

[0018] The beneficial effects of the positioning mechanism described in the utility model are as follows: the utility model provides a clamping assembly including a structural member, a clamping member arranged on one side of the structural member and a locking member arranged on the upper side of the clamping member, and a pressing assembly including a pressing member arranged on one side of the structural member, an extrusion member arranged on one side of the pressing member and a toggle member arranged on one side of the structural member, which cooperate with each other to facilitate rapid clamping and positioning of nuclear power plant fuel assemblies, and no disassembly tools such as screwdrivers are required during the clamping and positioning process, so clamping and disassembly are convenient, which greatly improves the repair efficiency of the device.

[0019] In view of the fact that in actual use, it is still difficult to quickly adjust the positioning mechanism.

[0020] In order to solve the above technical problems, the utility model also provides the following technical solutions: a lifting device for a nuclear power plant fuel assembly, comprising the above positioning mechanism, and also comprising a lifting assembly, including a lifting member arranged on one side of the structural member and a limiting member arranged on one side of the lifting member;

[0021] The lifting member includes a threaded rod threadedly arranged on one side of the mounting plate, a bottom plate arranged at the bottom end of the threaded rod, a top plate arranged at the top end of the threaded rod and a driving source arranged on one side of the top plate, and the output end of the driving source is connected to the threaded rod through a coupling.

[0022] As a preferred solution of the lifting device of the nuclear power plant fuel assembly of the utility model, the limiting member includes a limiting column arranged on one side of the bottom plate, and two limiting columns are arranged and penetrate the mounting plate and are slidably arranged therewith.

[0023] The beneficial effects of the lifting device for the nuclear power plant fuel assembly of the utility model are as follows: the utility model can automatically lift and adjust the nuclear power plant fuel assembly after the positioning mechanism clamps and positions the nuclear power plant fuel assembly through the provided lifting assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0025] Figure 1 It is a structural schematic diagram of the clamping assembly in this utility model.

[0026] Figure 2 It is a front view of the clamping assembly in this utility model.

[0027] Figure 3 It is a schematic diagram of the structure of the locking member in this utility model.

[0028] Figure 4 for Figure 1 A magnified view of the structure in the middle.

[0029] Figure 5 It is a structural schematic diagram of the clamping assembly in this utility model.

[0030] Figure 6 for Figure 5 Enlarged view of point B in .

[0031] Figure 7 It is a schematic diagram of the structure of the pressing member in this utility model.

[0032] Figure 8 It is a structural schematic diagram of the lifting component in this utility model. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0034] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0035] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0036] Example 1

[0037] Reference Figure 1-Figure 4 , which is the first embodiment of the utility model, and provides a positioning mechanism, including a clamping assembly 100, including a structural member 101, a clamping member 102 arranged on one side of the structural member 101, and a locking member 103 arranged on the upper side of the clamping member 102;

[0038] The pressing assembly 200 includes a pressing member 201 disposed on one side of the structural member 101, an extruding member 202 disposed on one side of the pressing member 201, and a toggle member 203 disposed on one side of the structural member 101;

[0039] The clamping member 102 includes a fixing plate 102a disposed on one side of the mounting member and a clamping plate 102e slidably disposed on one side of the mounting member.

[0040] Specifically, the structural member 101 includes a mounting plate 101a, a first connecting plate 101b disposed on one side of the mounting plate 101a, a second connecting plate 101c disposed on one side of the mounting plate 101a, and a mounting frame 101d disposed on one side of the mounting plate 101a.

[0041] Furthermore, the clamping member 102 includes a threaded sleeve 102b arranged on one side of the first connecting plate 101b, a screw 102c threadedly arranged on one side of the threaded sleeve 102b, a movable plate 102d rotatably arranged on one side of the screw 102c, and a clamping plate 102e arranged on one side of the movable plate 102d. The screw 102c will drive the movable plate 102d to move during rotation, and the movable plate 102d will drive the clamping plate 102e to move inward when moving. The clamping plate 102e and the fixed plate 102a on the other side cooperate with each other to clamp and position the fuel assembly placed on the upper side of the mounting plate 101a, and at the same time, the other side of the fixed plate 102a is locked and fixedly connected to the mounting plate 101a by bolts. The position of the fixed plate 102a on the upper side of the mounting plate 101a can be adjusted by bolts, so as to facilitate the clamping and fixing of fuel assemblies of different sizes.

[0042] Furthermore, the locking member 103 includes a groove 103a provided on the upper side of the movable plate 102d, a locking plate 103b slidably arranged in the groove 103a, a locking block 103c arranged on one side of the locking plate 103b and a compression spring 103d arranged on the inner side of the groove 103a, the two ends of the compression spring 103d are respectively connected to the side wall of the locking plate 103b and the inner wall of the groove 103a, and the compression spring 103d is used to reset and drive the locking plate 103b to slide. The locking member 103 also includes a sliding groove 103e provided on one side of the installation frame 101d, a sliding rod 103f arranged on the inner side of the sliding groove 103e, a lifting plate 103h slidably arranged on the outer side of the sliding rod 103f, a wedge block 103i arranged on one side of the lifting plate 103h and a return spring 103g sleeved on the outer side of the sliding rod 103f, and the two ends of the return spring 103g are respectively connected to the lifting plate The side wall of 103h is connected to the inner wall of the slide groove 103e, and the return spring 103g is used to drive the lifting plate 103h to return upward. The wedge block 103i extends into the gap between the locking block 103c. In the initial state, the inclined surfaces of the wedge block 103i and the locking block 103c are in contact with each other. At the same time, the elastic coefficient of the return spring 103g is greater than the elastic coefficient of the compression spring 103d. During the sliding process of the locking block 103c, the locking block 103c is squeezed by the inclined surface of the wedge block 103i to squeeze the locking plate 103b toward the groove 103a, so that the movable plate 102d can slide inward. When the clamping plate 102e is moved to clamp the fuel assembly, the vertical surfaces of the wedge block 103i and the locking block 103c are in contact with each other, thereby realizing the locking block 103c being stuck and fixed by the wedge block 103i, so as to achieve the fixed clamping effect of the lifting clamping plate 102e.

[0043] Operation process: when it is necessary to clamp and position the nuclear fuel assembly, first adjust the fixed plate 102a to the appropriate position and then fix it, then rotate the screw 102c to drive the movable plate 102d to slide, and when the movable plate 102d slides, it drives the clamping plate 102e to slide and start clamping and fixing the fuel assembly. During the sliding process, the locking block 103c is squeezed by the inclined surface of the wedge block 103i to squeeze the locking plate 103b toward the groove 103a, so that the movable plate 102d can slide inward, and when the clamping plate 102e is moved to clamp the fuel assembly, the vertical surfaces of the wedge block 103i and the locking block 103c contact each other, thereby achieving the wedge block 103i to fix the locking block 103c, so as to enhance the fixing and clamping effect of the clamping plate 102e.

[0044] Example 2

[0045] Reference Figure 2-Figure 7 , which is the second embodiment of the utility model. It is different from the previous embodiment in that: the pressing member 201 includes a pressing plate 201a slidably arranged in the installation frame 101d, a pressing block 201b arranged on the inner side of the pressing plate 201a, and the pressing member 201 also includes a limiting groove 201c opened on one side of the pressing plate 201a, a horizontal groove 201d arranged on one side of the limiting groove 201c, an arc groove 201e arranged on one side of the horizontal groove 201d, and limiting rods 201f arranged on both sides of the installation frame 101d. The limiting rods 201f extend into the limiting groove 201c and are slidably arranged therewith, and the pressing plate 201a is moved to drive the pressing plate 201a to slide left and right, and at the same time, the limiting rods 201f are inserted into the limiting groove 201c and are slidably arranged therewith. The limiting rod 201f is set, and the limiting rod 201f extends into the limiting groove 201c, and the limiting groove 201c is divided into two ends of a horizontal groove 201d and an arc groove 201e. When sliding to the arc groove 201e and contacting the limiting rod 201f, it will drive the clamping plate 201a to rotate slightly and tilt. At this time, the clamping plate 201a is in a slightly tilted state, and the clamping block 201b is in an unlocked and un-clamped state. When the limiting rod 201f slides from the arc groove 201e to the horizontal groove 201d, the clamping plate 201a rotates to a horizontal state and then slides. The clamped fuel assembly is auxiliary clamped by the set clamping block 201b, thereby enhancing the positioning effect of the device.

[0046] Specifically, the extrusion member 202 includes a connecting strip 202a disposed on one side of the pressing plate 201a, a connecting rod 202b disposed on one side of the connecting strip 202a, and an extrusion ball 202c disposed on one side of the connecting rod 202b. The extrusion ball 202c contacts the lifting plate 103h. When the pressing plate 201a is in a horizontal pressing state, the extrusion ball 202c squeezes the lifting plate 103h, driving the lifting plate 103h to be in a lower position. At this time, the wedge block 103i on the lower side of the lifting plate 103h is inserted into the locking plate 103b. The locking block 103c on the side locks and fixes the locking plate 103b, thereby improving the clamping and positioning effect of the clamping plate 102e. When the clamping plate 201a is in a tilted and unlocked state, it will drive the squeezing ball 202c to rise. At this time, the lifting plate 103h is driven by the rebound force of the reset spring 103g to slide upward, so that the wedge block 103i slides out of the tooth groove of the locking block 103c, releasing the locking fixation of the locking plate 103b, so that the clamping plate 102e can slide in the opposite direction to release the positioning of the fuel assembly.

[0047] Furthermore, the toggle member 203 includes a vertical plate 203a arranged on the upper side of the mounting plate 101a, a rotating rod 203b rotatably arranged on one side of the vertical plate 203a, an adjusting block 203c arranged on the outer side of the rotating rod 203b, the cross-section of the adjusting block 203c is arranged on a convex block with a fan-shaped structure, one side of which is provided with an arc-shaped protrusion, a rotating disk 203d arranged on one side of the rotating rod 203b, a toggle rod 203e sleeved on the outer side of the rotating rod 203b, an adjusting groove 203f opened on the side wall of the clamping plate 201a, one side of the adjusting groove 203f is provided with an inclined portion, and the toggle rod 203e can partially extend into the adjusting groove 203f during the rotation process, and the toggle member 203 also includes a main spring 203g arranged on one side of the second connecting plate 101c, and the two ends of the main spring 203g are respectively connected to the side wall of the second connecting plate 101c and the clamping plate When the clamping plate 201a needs to be unlocked, the rotating rod 203b is rotated. When the rotating rod 203b is rotated, the arc-shaped protrusion of the adjusting block 203c is slowly separated from the clamping plate 201a. At the same time, the toggle rod 203e extends into the adjusting groove 203f through the inclined portion of the adjusting groove 203f during the rotation process, and contacts the vertical portion of the adjusting groove 203f, thereby toggling the clamping plate 201a to slide slightly, and finally driving the clamping plate 201a to be adjusted from the horizontal clamping state to the inclined unlocking state, thereby realizing the rapid unlocking of the positioned and fixed fuel assembly.

[0048] The rest of the structure is the same as that of Example 1.

[0049] Operation process: After the fuel assembly is clamped and fixed by the clamping assembly 100, the rotating rod 203b is rotated. At this time, the adjusting rod rotates from the vertical part close to the adjusting groove 203f to the inclined part of the adjusting groove 203f, and is separated from the clamping plate 201a. At the same time, the arc-shaped protrusion of the adjusting block 203c begins to contact one end of the clamping plate 201a, driving the clamping plate 201a from the inclined state to the unlocked state and then to the horizontal clamping state. At the same time, the clamping plate 201a is locked and fixed. When the clamping plate 201a is in the horizontal clamping state, the squeezing ball 202c squeezes the lifting plate 103h, driving the lifting plate 103h to be located in a lower position. At this time, the wedge block 103i on the lower side of the lifting plate 103h is inserted into the locking block 103c on the upper side of the locking plate 103b, and the locking plate 103b is locked and fixed, thereby improving the clamping and positioning effect of the clamping plate 102e.

[0050] When it is necessary to quickly unlock and remove the fuel assembly, the rotating rod 203b is rotated in the opposite direction, and the arc-shaped protrusion of the adjusting block 203c slowly separates from the clamping plate 201a. At the same time, the toggle rod 203e extends into the adjusting groove 203f through the inclined portion of the adjusting groove 203f during the rotation process, and contacts the vertical portion of the adjusting groove 203f, thereby toggling the clamping plate 201a to slide slightly, and finally drives the clamping plate 201a to be adjusted from the horizontal clamping state to the inclined unlocking state, and releases the clamping state. At the same time, when the clamping plate 201a is in the tilted and unlocked state, it will drive the squeezing ball 202c to rise. At this time, the lifting plate 103h is subjected to the rebound force of the reset spring 103g, driving it to slide upward, so that the wedge block 103i slides out of the tooth groove of the locking block 103c, releasing the locking fixation of the locking plate 103b, so that the clamping plate 102e can slide in the opposite direction to release the positioning of the fuel assembly.

[0051] Example 3

[0052] Reference Figure 1-Figure 8 , which is the third embodiment of the utility model. Different from the above embodiments, this embodiment provides a lifting device for a nuclear power plant fuel assembly, including the above positioning mechanism, and also includes a lifting assembly 300, including a lifting member 301 arranged on one side of the structural member 101 and a limiting member 302 arranged on one side of the lifting member 301;

[0053] The lifting member 301 includes a threaded rod 301a threadedly arranged on one side of the mounting plate 101a, a bottom plate 301b arranged at the bottom end of the threaded rod 301a, a top plate 301c arranged at the top end of the threaded rod 301a, and a driving source 301d arranged on one side of the top plate 301c. The output end of the driving source 301d is connected to the threaded rod 301a through a coupling. The threaded rod 301a penetrates the mounting plate 101a and is threadedly connected thereto. When the driving source 301d drives the threaded rod 301a to rotate, it can drive the mounting plate 101a to automatically lift and slide.

[0054] Specifically, the limiting member 302 includes a limiting column 302a arranged on one side of the bottom plate 301b, two limiting columns 302a are provided and penetrate the mounting plate 101a and are slidably arranged therewith, and the limiting columns 302a can be used to limit the mounting plate 101a during the lifting and sliding process, and at the same time, the stability of the mounting plate 101a during the lifting and sliding process can be improved, and the two ends of the limiting rod 201f are respectively fixedly connected to the bottom plate 301b and the top plate 301c, and the two limiting rods 201f can improve the installation stability of the top plate 301c, which is used to support the top plate 301c.

[0055] The rest of the structure is the same as that of Example 2.

[0056] Operation process: After the fuel assembly is clamped and fixed in position, starting the driving source 301d can drive the threaded rod 301a to rotate, thereby driving the mounting plate 101a to be lifted, lowered, slid and adjusted, so as to adjust the height of the mounting plate 101a. During the sliding process, the limiting column 302a can be used to limit the mounting plate 101a during the lifting and sliding process, and at the same time, the stability of the mounting plate 101a during the lifting and sliding process can be improved. The two ends of the limiting rod 201f are fixedly connected to the bottom plate 301b and the top plate 301c respectively. The two limiting rods 201f can improve the installation stability of the top plate 301c, which is used to support the top plate 301c, thereby improving the overall stability of the device.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A positioning mechanism, characterized in that: It comprises a clamping assembly (100), comprising a structural member (101), a clamping member (102) arranged on one side of the structural member (101), and a locking member (103) arranged on the upper side of the clamping member (102); A pressing assembly (200) comprises a pressing member (201) arranged on one side of a structural member (101), an extruding member (202) arranged on one side of the pressing member (201), and a toggle member (203) arranged on one side of the structural member (101); The clamping member (102) comprises a fixing plate (102a) arranged on one side of the structural member (101) and a clamping plate (102e) slidably arranged on one side of the structural member (101).

2. The positioning mechanism according to claim 1, characterized in that: The structural member (101) comprises a mounting plate (101a), a first connecting plate (101b) arranged on one side of the mounting plate (101a), a second connecting plate (101c) arranged on one side of the mounting plate (101a), and a mounting frame (101d) arranged on one side of the mounting plate (101a).

3. The positioning mechanism according to claim 2, characterized in that: The clamping member (102) comprises a threaded sleeve (102b) arranged on one side of the first connecting plate (101b), a screw rod (102c) threadedly arranged on one side of the threaded sleeve (102b), a movable plate (102d) rotatably arranged on one side of the screw rod (102c), and a clamping plate (102e) arranged on one side of the movable plate (102d).

4. The positioning mechanism according to claim 2 or 3, characterized in that: The locking member (103) comprises a groove (103a) provided on the upper side of the movable plate (102d), a locking plate (103b) slidably arranged in the groove (103a), a locking block (103c) arranged on one side of the locking plate (103b), and a compression spring (103d) arranged inside the groove (103a); The locking member (103) further comprises a slide groove (103e) provided on one side of the installation frame (101d), a slide rod (103f) arranged on the inner side of the slide groove (103e), a lifting plate (103h) slidably arranged on the outer side of the slide rod (103f), a wedge block (103i) arranged on one side of the lifting plate (103h) and a return spring (103g) sleeved on the outer side of the slide rod (103f), wherein the wedge block (103i) extends into the gap between the locking blocks (103c).

5. The positioning mechanism according to claim 4, characterized in that: The pressing member (201) comprises a pressing plate (201a) slidably disposed in the installation frame (101d) and a pressing block (201b) disposed inside the pressing plate (201a); The clamping member (201) further comprises a limiting groove (201c) provided on one side of the clamping plate (201a), a horizontal groove (201d) provided on one side of the limiting groove (201c), an arc groove (201e) provided on one side of the horizontal groove (201d), and limiting rods (201f) provided on both sides of the installation frame (101d), wherein the limiting rods (201f) extend into the limiting groove (201c) and are slidably arranged therewith.

6. The positioning mechanism according to claim 5, characterized in that: The extrusion member (202) comprises a connection strip (202a) arranged on one side of the pressing plate (201a), a connection rod (202b) arranged on one side of the connection strip (202a), and an extrusion ball (202c) arranged on one side of the connection rod (202b), wherein the extrusion ball (202c) is in contact with the lifting plate (103h).

7. The positioning mechanism according to claim 6, characterized in that: The toggle member (203) comprises a vertical plate (203a) arranged on the upper side of the mounting plate (101a), a rotating rod (203b) rotatably arranged on one side of the vertical plate (203a), an adjusting block (203c) arranged on the outside of the rotating rod (203b), a rotating disk (203d) arranged on one side of the rotating rod (203b), a toggle rod (203e) sleeved on the outside of the rotating rod (203b), and an adjusting groove (203f) provided on the side wall of the pressing plate (201a); the toggle rod (203e) can partially extend into the adjusting groove (203f) during the rotation process.

8. The positioning mechanism according to claim 7, characterized in that: The toggle member (203) further comprises a main spring (203g) arranged on one side of the second connecting plate (101c), and two ends of the main spring (203g) are respectively connected to the side wall of the second connecting plate (101c) and the side wall of the pressing plate (201a).

9. A lifting device for a nuclear power plant fuel assembly, characterized in that: The positioning mechanism comprises any one of claims 1 to 8, and further comprises a lifting assembly (300), comprising a lifting member (301) arranged on one side of the structural member (101) and a limiting member (302) arranged on one side of the lifting member (301); The lifting member (301) comprises a threaded rod (301a) threadedly arranged on one side of the mounting plate (101a), a bottom plate (301b) arranged at the bottom end of the threaded rod (301a), a top plate (301c) arranged at the top end of the threaded rod (301a), and a driving source (301d) arranged on one side of the top plate (301c), wherein the output end of the driving source (301d) is connected to the threaded rod (301a) via a coupling.

10. The lifting device for a nuclear power plant fuel assembly according to claim 9, characterized in that: The limiting member (302) comprises a limiting column (302a) arranged on one side of the bottom plate (301b), and two limiting columns (302a) are provided and penetrate the mounting plate (101a) and are slidably arranged therewith.

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