Remote operation lifting device for fuel assembly of nuclear power plant

Abstract

The utility model discloses a remote operation lifting device for a fuel assembly of a nuclear power plant. The remote operation lifting device comprises a lifting assembly, a transmission assembly, a core rod connecting assembly, a grabbing assembly, a positioning assembly and a control assembly, according to the remote operation lifting device for the fuel assembly of the nuclear power plant, through the arrangement of the transmission assembly, the lifting assembly and the core rod connecting assembly can be driven to move together, so that the core rod connecting assembly can do reciprocating linear motion, opening and closing of the grabbing assembly are controlled, and the action of grabbing and releasing the simulated fuel assembly is achieved. Meanwhile, the positioning assembly is arranged to be positioned on the fuel assembly upper pipe base, rigid positioning between the whole nuclear power plant fuel assembly remote operation lifting device and the fuel assembly upper pipe base is ensured, and the stability of the nuclear power plant fuel assembly remote operation lifting device in the working process is ensured. And the control assembly is further arranged and can control the transmission assembly so as to control movement of the grabbing assembly, and the remote control function is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to nuclear power plant fuel assembly grab technical field especially relates to a nuclear power plant fuel assembly remote operation hoist device. BACKGROUND

[0002] At present, a kind of fuel assembly short handle grab is widely used in nuclear power plant to implement the grabbing of fuel assembly, personnel close-range operation handle up and down movement is completed to open and close the action of grab multiple clamping jaw, to realize the grabbing and release of fuel assembly. Since it is manually operated, the operator needs to be lowered to the bottom of the pool to realize the grabbing and release action of grab, with safety risk and contamination risk. Moreover, short handle tool cannot be remotely operated, short handle tool hoists fuel assembly into transmission system tilting machine, and the operator needs to be dressed in gas clothes to be lowered to the top of tilting machine above the bottom of transmission pool to perform unlocking operation, the environment dose is high at the bottom of transmission pool, the operator is dressed in gas clothes to operate on the transmission system tilting machine, limited by environment, the safety risk of operator is high, and the event of tilting machine putting simulation assembly clamp to foot has occurred in some nuclear power station, and safety risk cannot be eliminated by only personnel risk warning.

[0003] In addition, fuel assembly is easy to twist when being put into tilting machine, fuel assembly is easy to twist in the process of being put into tilting machine, cannot be put into tilting machine, operator is difficult to adjust, fuel assembly is inconvenient to operate into tilting machine, and site operation efficiency is affected.

[0004] Therefore, it is necessary to develop a tool that can remotely control the grabbing / release of fuel assembly, without the need for the operator to be lowered to the transfer pool, to complete the transfer of fuel assembly, reduce the radiation dose of operator and reduce the operation risk to prevent contamination events. INVENTION CONTENTS

[0005] The utility model solves the technical problem to provide a nuclear power plant fuel assembly remote operation hoist device.

[0006] The utility model solves the technical problem and adopts the technical scheme in the following:<Device for hoisting nuclear power plant fuel assembly> a nuclear power plant fuel assembly remote operation hoist device is constructed, and it includes lifting assembly, transmission assembly, core rod connecting assembly, grabbing assembly, positioning assembly and control assembly;

[0007] The transmission assembly is connected to the lifting assembly, and the transmission assembly is used to drive the lifting assembly to move;

[0008] The core rod connecting assembly is connected to the end of the lifting assembly away from the transmission assembly, and the core rod connecting assembly is used to drive the grabbing assembly to move, and the grabbing assembly is used to grab fuel assembly;

[0009] The positioning assembly is connected to the grabbing assembly, and the positioning assembly is used to be positioned on the tube base of fuel assembly.

[0010] The control assembly is in communication connection with the transmission assembly.

[0011] In some embodiments, the transmission assembly comprises a transmission box body, a driver mounted on the transmission box body, a driving transmission member connected with an output end of the driver, and a driven transmission member meshingly connected with the driving transmission member.

[0012] In some embodiments, the lifting assembly comprises a driving screw connected with the driven transmission member, a lifting nut drivingly connected with a lower end of the driving screw, and a connecting sleeve connected with a lower end of the lifting nut.

[0013] In some embodiments, the core rod connecting assembly comprises an outer tube body, a core rod body, a positioning pin shaft, a pipe joint, and a sleeve;

[0014] An upper end of the outer tube body is connected with the transmission box body, and a lower end of the outer tube body is connected with the pipe joint;

[0015] An upper end of the core rod body is connected with the connecting sleeve, the core rod body is arranged through the pipe joint, and a lower end of the core rod body is connected with the sleeve;

[0016] The positioning pin shaft is used for connecting the upper end of the core rod body and the connecting sleeve.

[0017] In some embodiments, the core rod connecting assembly further comprises a switch bracket, a detection switch, a spring support, and a shock-absorbing spring;

[0018] The switch bracket is mounted on the outer tube body, the detection switch is mounted on the switch bracket, the spring support is sleeved on the core rod body, an upper end of the shock-absorbing spring is connected with the spring support, and a lower end of the shock-absorbing spring is connected with the pipe joint.

[0019] In some embodiments, the lifting assembly further comprises a limiting member, a limiting groove is formed in the outer tube body, the limiting groove is arranged along a height direction of the outer tube body, a fixed end of the limiting member is fixedly connected with the lifting nut, and a movable end of the limiting member is mounted in the limiting groove.

[0020] In some embodiments, the grabbing assembly comprises a grabbing head body, a plurality of grabbing claws, and a plurality of limiting pin shafts;

[0021] An upper end of the grabbing head body is connected with the pipe joint, each of the grabbing claws is connected with the grabbing head body through the limiting pin shaft, the grabbing claw is capable of rotating relative to the grabbing head body, the grabbing claw is located below the sleeve, and the sleeve is used for driving the grabbing claw to move.

[0022] In some embodiments, the positioning assembly comprises a positioning seat, a support tube, a guide, a spring mounting seat and a guide spring.

[0023] The positioning seat is fixedly connected with the lower end of the grab head body, the support tube and the spring mounting seat are separately mounted on the two sides of the positioning seat, the guide is movably mounted in the support tube, and the two ends of the guide spring are connected with the spring mounting seat and the guide respectively.

[0024] In some embodiments, the positioning assembly further comprises a supporting leg mounted on the positioning seat, and the supporting leg is connected with the positioning seat through a fastener.

[0025] In some embodiments, the nuclear power plant fuel assembly remote operation lifting device further comprises a lifting ring mounted on the transmission box.

[0026] The nuclear power plant fuel assembly remote operation lifting device has the following beneficial effects: through the arrangement of the transmission assembly, the lifting assembly and the core rod connecting assembly can be driven to move together, so that the core rod connecting assembly can make straight reciprocating motion, thereby controlling the opening and closing of the grabbing assembly, and realizing the action of grabbing and releasing the simulated fuel assembly. The positioning assembly is arranged to be positioned on the tube seat of the fuel assembly, thereby ensuring the rigid positioning between the nuclear power plant fuel assembly remote operation lifting device and the tube seat of the fuel assembly, and ensuring the stability of the nuclear power plant fuel assembly remote operation lifting device during operation. The control assembly is arranged to control the movement of the transmission assembly and the grabbing assembly, thereby realizing the remote control function. The nuclear power plant fuel assembly remote operation lifting device improves the efficiency of adjusting and using the grabbing assembly, reduces the safety risk of personnel, and ensures the safety of maintenance personnel. The installation and removal of the grabbing assembly of the nuclear power plant fuel assembly remote operation lifting device can be operated at the bottom of the component pool, without the need for personnel to enter the maintenance area for disassembly, thereby reducing the repeated communication between the disassembly personnel and the crane operator, and eliminating the safety risk caused by poor communication. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical scheme of the present application, the following will further illustrate the present application in conjunction with the drawings and embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor. In the drawings:

[0028] Figure 1 is the overall structure diagram of the nuclear power plant fuel assembly remote operation lifting device in some embodiments of the present application;

[0029] Figure 2 is a structure section schematic view of the nuclear power plant fuel assembly remote operation lifting device in some embodiments of the utility model;

[0030] Figure 3 is a structure schematic view of the lifting assembly in some embodiments of the utility model;

[0031] Figure 4 is a local structure schematic view of the nuclear power plant fuel assembly remote operation lifting device in some embodiments of the utility model;

[0032] Figure 5 is a structure schematic view of the transmission assembly in some embodiments of the utility model;

[0033] Figure 6 is a structure schematic view of the core rod connecting assembly in some embodiments of the utility model;

[0034] Figure 7 is a structure schematic view of the grabbing assembly in some embodiments of the utility model;

[0035] Figure 8 is a structure schematic view of the positioning assembly in some embodiments of the utility model;

[0036] Figure 9 is a control principle schematic view of the control assembly in some embodiments of the utility model. DETAILED DESCRIPTION

[0037] In order to have a more clear understanding of the technical features, purposes and effects of the utility model, the specific implementation manners of the utility model will be described in detail with reference to the drawings. In the following description, it should be understood that the directions or position relations indicated by "front", "back", "up", "down", "left", "right", "vertical", "horizontal", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail" are based on the directions or position relations shown in the drawings, the specific directions are constructed and operated, and are only for the convenience of describing the technical scheme, and cannot be understood as indicating that the devices or elements must have the specific directions, so it cannot be understood as the limitation of the utility model.

[0038] It should be noted that, unless otherwise expressly specified and limited, the terms "mounting", "connecting", "connecting", "fixing", "setting" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. When an element is referred to as "on" or "below" another element, the element can be "directly" or "indirectly" above another element, or there can be one or more intervening elements. The terms "first", "second", "third" and the like are only for the convenience of describing the technical solutions, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features with "first", "second", "third" and the like can be explicitly or implicitly include one or more features. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] Please refer to Figures 1 to 9 It is a kind of nuclear power plant fuel assembly remote operation lifting device in some embodiments of the present application, it includes lifting assembly 1, transmission assembly 2, core rod connecting assembly 3, grabbing assembly 4, positioning assembly 5 and control assembly 6. Transmission assembly 2 is connected to lifting assembly 1, and transmission assembly 2 is used to drive lifting assembly 1 to move;Core rod connecting assembly 3 is connected to the end of lifting assembly 1 away from transmission assembly 2, and core rod connecting assembly 3 is used to drive grabbing assembly 4 to move, and grabbing assembly 4 is used to grab fuel assembly;Positioning assembly 5 is connected to grabbing assembly 4, and positioning assembly 5 is used to be positioned on the tube base of fuel assembly;Control assembly 6 is in communication connection with transmission assembly 2.

[0040] Understandably, the nuclear power plant fuel assembly remote operation lifting device drives the lifting assembly 1 and the core rod connecting assembly 3 to move through the transmission assembly 2, so that the core rod connecting assembly 3 can make reciprocating linear motion, thereby controlling the opening and closing of the grabbing assembly 4, and realizing the action of grabbing and releasing the simulated fuel assembly. At the same time, the positioning assembly 5 is arranged to be positioned on the fuel assembly upper tube seat, which ensures the rigid positioning between the nuclear power plant fuel assembly remote operation lifting device and the fuel assembly upper tube seat, and guarantees the stability of the nuclear power plant fuel assembly remote operation lifting device during operation. The control assembly 6 is also provided, which can control the transmission assembly 2 and thereby control the movement of the grabbing assembly 4, realizing the remote control function. The nuclear power plant fuel assembly remote operation lifting device improves the efficiency of adjusting and using the grabbing assembly 4, reduces the safety risk of personnel, and ensures the safety of maintenance personnel. The installation and removal of the grabbing assembly 4 of the nuclear power plant fuel assembly remote operation lifting device can be operated at the bottom of the component pool, without the need for personnel to enter the maintenance area for disassembly, and at the same time, the work of repeated communication between the disassembly personnel and the crane operator is reduced, and the safety risk caused by the unsmooth communication is eliminated.

[0041] As shown in Figure 5 , the transmission assembly 2 includes a transmission box 21, a drive 22 mounted on the transmission box 21, a driving transmission member 23 connected with the output end of the drive 22, and a driven transmission member 24 meshed with the driving transmission member 23. The drive 22 can be a direct current motor, which is the power source of the whole nuclear power plant fuel assembly remote operation lifting device, and provides power for the whole nuclear power plant fuel assembly remote operation lifting device. The driving transmission member 23 and the driven transmission member 24 are both gears, and when the drive 22 acts, the driving transmission member 23 and the driven transmission member 24 rotate at the same time.

[0042] As shown in Figure 3 and Figure 4 , the lifting assembly 1 includes a transmission screw 11 connected with the driven transmission member 24, a lifting nut 12 drivingly connected with the lower end of the transmission screw 11, and a connecting sleeve 13 connected with the lower end of the lifting nut 12. Specifically, the transmission screw 11 and the lifting nut 12 cooperate, and the rotation of the transmission screw 11 drives the lifting nut 12 to rise and fall. The lifting nut 12 and the transmission screw 11 cooperate to transmit power and mechanically lock, and the connecting sleeve 13 is connected with the lifting nut 12 at the upper end to transmit power. Upper mechanical structure limit and upper mechanical structure limit can also be designed separately on the upper and lower positions of the lifting nut 12 to prevent the detection switch 37 from malfunctioning, which provides double protection.

[0043] As shown in Figure 4 and Figure 6As shown, the core rod connecting assembly 3 comprises an outer tube 31, a core rod body 32, a positioning pin shaft 33, a tube joint 34 and a sleeve 35. The upper end of the outer tube 31 is connected to the transmission box 21, and the lower end of the outer tube 31 is connected to the tube joint 34; the upper end of the core rod body 32 is connected to the connecting sleeve 13, the core rod body 32 is arranged in the tube joint 34, and the lower end of the core rod body 32 is connected to the sleeve 35; the positioning pin shaft 33 is used to connect the upper end of the core rod body 32 and the connecting sleeve 13. Specifically, the upper end of the outer tube 31 can be connected to the transmission box 21 by bolts, and the lower end can be connected to the tube joint 34 by connecting pins or bolts, and the core rod body 32 can be lifted along with the lifting nut 12, thereby driving the sleeve 35 to move, and the sleeve 35 can drive the grabbing assembly 4 to move while moving.

[0044] Further, the core rod connecting assembly 3 further comprises a switch bracket 36, a detection switch 37, a spring support 38 and a shock-absorbing spring 39. The switch bracket 36 is installed on the outer tube 31, the detection switch 37 is installed on the switch bracket 36, the spring support 38 is sleeved on the core rod body 32, the upper end of the shock-absorbing spring 39 is connected to the spring support 38, and the lower end of the shock-absorbing spring 39 is connected to the tube joint 34. The number of detection switches 37 can be two, and the two detection switches 37 can be used to detect the upper limit position and the lower limit position of the core rod body 32 and transmit to the control assembly 6. The shock-absorbing spring 39 can be used for buffering of the sleeve 35.

[0045] As shown in Figure 4 The lifting assembly 1 further comprises a limiting member 14, a limiting groove 311 is formed in the outer tube 31, the limiting groove 311 is arranged along the height direction of the outer tube 31, the fixed end of the limiting member 14 is fixedly connected to the lifting nut 12, and the movable end of the limiting member 14 is installed in the limiting groove 311. It can be understood that the number of limiting members 14 is preferably two, the limiting member 14 cooperates with the limiting groove 311 to limit the radial rotation of the lifting nut 12, so that the lifting nut 12 can only move up and down along the limiting groove 311.

[0046] As shown in Figure 7As shown, the grabbing assembly 4 comprises a grabbing head body 41 and a plurality of grabbing claws 42 and a plurality of limiting pin shafts 43. The upper end of the grabbing head body 41 is connected to the pipe joint 34, each grabbing claw 42 is connected to the grabbing head body 41 through the limiting pin shaft 43, the grabbing claw 42 can rotate relative to the grabbing head body 41, the grabbing claw 42 is below the sleeve 35, and the sleeve 35 is used to drive the grabbing claw 42 to move. Specifically, the grabbing head body 41 can be fixedly connected to the pipe joint 34, and the grabbing claw 42 is installed on the grabbing head body 41 and used to grab the fuel assembly. The number of the grabbing claw 42 is preferably four, and the four grabbing claws 42 are uniformly arranged along the circumferential direction of the grabbing head body 41. When the sleeve 35 moves downward, the grabbing claw 42 rotates around the limiting pin shaft 43, and at this time, the four grabbing claws 42 are generally open and in a release state. When the sleeve 35 moves upward, at this time, the four grabbing claws 42 are generally contracted and in a grabbing state. By opening and closing the grabbing claw 42, the fuel assembly can be grabbed and released.

[0047] As shown in the figure, Figure 8 The positioning assembly 5 comprises a positioning seat 51, a support pipe 52, a guide piece 53, a spring mounting seat 54 and a guide spring 55. The positioning seat 51 is fixedly connected to the lower end of the grabbing head body 41, the support pipe 52 and the spring mounting seat 54 are separately installed on the two sides of the positioning seat 51, the guide piece 53 is movably installed in the support pipe 52, and the two ends of the guide spring 55 are connected to the spring mounting seat 54 and the guide piece 53 respectively. Specifically, the positioning seat 51 can be welded to the lower end of the grabbing head body 41, the support pipe 52 provides a guiding and supporting action for the guide piece 53, the guide piece 53 is used to be inserted into the guide hole of the upper nozzle of the fuel assembly, and when the guide piece 53 is inserted into the guide hole of the upper nozzle of the fuel assembly, the guide spring 55 plays a buffering action. In this embodiment, the number of the support pipe 52, the guide piece 53, the spring mounting seat 54 and the guide spring 55 is two, and the above-mentioned components are symmetrically distributed on the diagonal positions of the positioning seat 51.

[0048] The positioning assembly 5 further comprises a support leg piece 56 installed on the positioning seat 51, and the support leg piece 56 is connected to the positioning seat 51 through a fastener 57. The fastener 57 can be a bolt, the support leg piece 56 can be fixed on the positioning seat 51 through the bolt, and the support leg piece 56 can abut against the surface of the upper nozzle of the fuel assembly to provide a supporting action. In this embodiment, the number of the support leg piece 56 is two, and the two support leg pieces 56 are symmetrically distributed on the diagonal positions of the positioning seat 51.

[0049] As shown in the figure, Figure 1 The nuclear power plant fuel assembly remote operation lifting device further comprises a lifting ring piece 7 installed on the transmission box body 21. The lifting ring piece 7 can be matched with an external crane to transport the nuclear power plant fuel assembly remote operation lifting device.

[0050] As shown in the figure, Figure 9As shown, the control assembly 6 mainly comprises a control cabinet, indicator lights, cables, operating handles, etc. The control cabinet is internally composed of a battery, an air switch, a relay, a speed regulator, etc. Its schematic diagram is shown in Figure 9 The battery supplies power to the control assembly 6, the detection switch 37 feeds back the position information of the core connecting assembly, and the speed regulator adjusts the speed of the driver 22. The mushroom head emergency stop, open and close buttons are provided on the operator, which are used as the human-machine interface of the control assembly 6. They are used to control the forward and reverse rotation, emergency stop and other functions of the driver 22. The control assembly 6 can control the opening and closing of the gripper 42 by controlling the action of the driver 22, and can also receive the signal of the detection switch 37 and display the stop-to-position.

[0051] The specific operation steps of the nuclear power plant fuel assembly remote operation lifting device are as follows:

[0052] The crane is operated to lift the entire nuclear power plant fuel assembly remote operation lifting device through the lifting ring 7, so that the nuclear power plant fuel assembly remote operation lifting device is kept in a vertical and free state. Then the crane is operated to lower the nuclear power plant fuel assembly remote operation lifting device, and the guide piece 53 is inserted into the guide hole of the upper tube seat of the fuel assembly, so as to realize the relative positioning between the nuclear power plant fuel assembly remote operation lifting device and the upper tube seat of the fuel assembly. After the nuclear power plant fuel assembly remote operation lifting device is successfully positioned, the control assembly 6 is used to control the movement of the driver 22, so that the gripper assembly 4 grasps the fuel assembly. After the gripper assembly 4 completes grasping the fuel assembly, the crane is operated to rise, the nuclear power plant fuel assembly remote operation lifting device is raised to a certain height, and then moved to the tilting machine. The crane is operated to lower the nuclear power plant fuel assembly remote operation lifting device to the position, and the control assembly 6 is used to control the gripper assembly 4 to release the fuel assembly. In any case before the lifting / descending work of the nuclear power plant fuel assembly remote operation lifting device is completed, the gripper assembly 4 and the fuel assembly are not allowed to be detached.

[0053] It can be understood that the above embodiment only expresses the preferred embodiment of the present application, which is described in detail, but it cannot be understood as a limitation on the scope of the patent of the present application. It should be pointed out that for ordinary skilled persons in the art, the above technical features can be freely combined without departing from the concept of the present application, and some deformations and improvements can be made, which all belong to the protection scope of the present application. Therefore, any equivalent transformation and modification within the scope of the claims of the present application shall belong to the scope of the claims of the present application.

Claims

1. A remotely operated fuel assembly hoist for a nuclear power plant, characterized by, The lifting assembly (1), the transmission assembly (2), the core rod connecting assembly (3), the grabbing assembly (4), the positioning assembly (5) and the control assembly (6) are included. The transmission assembly (2) is connected to the lifting assembly (1), and the transmission assembly (2) is used for driving the lifting assembly (1) to move. The core rod connecting assembly (3) is connected to the end of the lifting assembly (1) away from the transmission assembly (2), the core rod connecting assembly (3) is used for driving the grabbing assembly (4) to move, and the grabbing assembly (4) is used for grabbing the fuel assembly. The positioning assembly (5) is connected to the grabbing assembly (4), and the positioning assembly (5) is used for positioning on the tube seat of the fuel assembly. The control assembly (6) is in communication connection with the transmission assembly (2).

2. The remotely operated fuel assembly lifting device of a nuclear power plant according to claim 1, characterized in that, The transmission assembly (2) includes a transmission box body (21), a driver (22) installed on the transmission box body (21), a driving transmission member (23) connected with the output end of the driver (22), and a driven transmission member (24) meshed with the driving transmission member (23).

3. The remotely operated fuel assembly lifting device of a nuclear power plant according to claim 2, characterized in that, The lifting assembly (1) includes a transmission screw (11) connected with the driven transmission member (24), a lifting nut (12) in transmission connection with the lower end of the transmission screw (11), and a connecting sleeve (13) connected with the lower end of the lifting nut (12).

4. The remotely operated fuel assembly lifting device of a nuclear power plant according to claim 3, characterized in that, The core rod connecting assembly (3) includes an outer tube body (31), a core rod body (32), a positioning pin shaft (33), a pipe joint (34), and a sleeve (35). The upper end of the outer tube body (31) is connected to the transmission box body (21), and the lower end of the outer tube body (31) is connected to the pipe joint (34). The upper end of the core rod body (32) is connected to the connecting sleeve (13), the core rod body (32) is arranged in the pipe joint (34), and the lower end of the core rod body (32) is connected to the sleeve (35). The positioning pin shaft (33) is used for connecting the upper end of the core rod body (32) and the connecting sleeve (13).

5. The remotely operated fuel assembly lifting device of a nuclear power plant according to claim 4, characterized in that, The core rod connecting assembly (3) further includes a switch bracket (36), a detection switch (37), a spring support (38), and a shock absorbing spring (39). The switch bracket (36) is installed on the outer tube body (31), the detection switch (37) is installed on the switch bracket (36), the spring support (38) is sleeved on the core rod body (32), the upper end of the shock absorbing spring (39) is connected to the spring support (38), and the lower end of the shock absorbing spring (39) is connected to the pipe joint (34).

6. The remotely operated fuel assembly lifting device of a nuclear power plant of claim 4, wherein, The lifting assembly (1) further includes a limiting piece (14), a limiting groove (311) is formed in the outer tube body (31), the limiting groove (311) is arranged along the height direction of the outer tube body (31), the fixed end of the limiting piece (14) is fixedly connected to the lifting nut (12), and the movable end of the limiting piece (14) is installed in the limiting groove (311).

7. The remotely operated fuel assembly lifting device of claim 5, wherein, The grabbing assembly (4) comprises a grabbing head body (41), a plurality of grabbing claws (42) and a plurality of limiting pin shafts (43); The upper end of the grabbing head body (41) is connected to the pipe joint (34), each grabbing claw (42) is connected to the grabbing head body (41) through the limiting pin shaft (43), the grabbing claw (42) can rotate relative to the grabbing head body (41), the grabbing claw (42) is below the sleeve (35), and the sleeve (35) is used for driving the grabbing claw (42) to move.

8. The remotely operated fuel assembly lifting device of a nuclear power plant of claim 7, wherein, The positioning assembly (5) comprises a positioning seat (51), a supporting pipe (52), a guide piece (53), a spring mounting seat (54) and a guide spring (55). The lower end of the grabbing head body (41) is fixedly connected to the positioning seat (51), the supporting pipe (52) and the spring mounting seat (54) are separately installed on the two sides of the positioning seat (51), the guide piece (53) is movably installed in the supporting pipe (52), and the two ends of the guide spring (55) are connected to the spring mounting seat (54) and the guide piece (53) respectively.

9. The remotely operated fuel assembly lifting device of a nuclear power plant of claim 8, wherein, The positioning assembly (5) further comprises a supporting leg piece (56) installed on the positioning seat (51), and the supporting leg piece (56) is connected to the positioning seat (51) through a fastener (57).

10. The remotely operated fuel assembly lifting device of a nuclear power plant of claim 2, wherein, The nuclear power plant fuel assembly remote operation lifting device further comprises a lifting ring piece (7) installed on the transmission box body (21).

Images