Three-dimensional hoisting mechanism for liquid nitrogen tank

Abstract

The utility model provides a liquid nitrogen tank three-dimensional hoisting mechanism which comprises a stand column arranged on a liquid nitrogen tank, a horizontal hoisting arm is rotatably arranged at the top of the stand column, a hoisting hook used for hooking a cryopreservation frame is arranged below the horizontal hoisting arm, and the hoisting hook can be driven to move relatively in the length direction of the horizontal hoisting arm and the axis direction of the stand column. A positioning plate is arranged at the top of the liquid nitrogen tank, inserting rods are fixed to the top of the positioning plate, and inserting holes matched with the inserting rods are formed in the bottoms of the stand columns. A positioning assembly is arranged on the stand column and used for locking the relative position between the inserting rod and the inserting hole. By additionally arranging the positioning plate, the positioning assembly and the like, the upright post can be conveniently and efficiently disassembled and assembled on the liquid nitrogen tank, so that the whole hoisting mechanism can be conveniently maintained.

Description

Technical Field

[0001] This utility model relates to the field of hoisting equipment technology, specifically to a three-dimensional hoisting mechanism for liquid nitrogen tanks. Background Technology

[0002] The statements herein provide only background information related to this invention and do not necessarily constitute prior art.

[0003] In practical applications of liquid nitrogen tanks, frequent and precise sample hoisting is a critical operation. Currently, many liquid nitrogen tanks rely on relatively simple methods for sample hoisting. Some simply install hooks at the tank opening and rely on manual labor with ropes and other tools to hoist samples; others use small lifting arms installed on the top of the tank, but this structure usually only allows limited movement within a two-dimensional plane and cannot achieve full-range, flexible three-dimensional operation.

[0004] The related technology disclosed in utility model patent CN219222083U is a cryopreservation rack lifting device, which includes a column assembly and a horizontal boom assembly rotatably connected to the top of the column assembly. The horizontal boom assembly includes a horizontal boom, on which a lifting component is slidably connected. The lifting component can be driven to reciprocate linearly along the length of the horizontal boom, and includes a hook that can be raised and lowered for hooking the cryopreservation rack. The hook in the lifting component, which can be driven to reciprocate linearly, hooks the cryopreservation rack and adjusts its height and horizontal position. The rotatable horizontal boom assembly facilitates the transfer of the cryopreservation rack inside and outside the liquid nitrogen tank, thereby achieving mechanized storage and retrieval of the cryopreservation rack and the specimens on it. This effectively avoids the fatigue-induced damage to the cryopreservation rack and specimens caused by manual handling in existing technologies, and effectively prevents frostbite to operators caused by the low temperature of the liquid nitrogen tank.

[0005] However, the aforementioned patented technology has the following drawbacks:

[0006] The column assembly is usually installed and fixed on the top of the liquid nitrogen tank by bolts, which makes disassembly and assembly inconvenient when maintenance of the lifting device is required. Utility Model Content

[0007] The main purpose of this utility model is to provide a three-dimensional hoisting mechanism for liquid nitrogen tanks.

[0008] To achieve the above objectives, the technical solution of this utility model is as follows: a three-dimensional lifting mechanism for a liquid nitrogen tank includes a column mounted on the liquid nitrogen tank, a horizontal boom rotatably mounted on the top of the column, and a hook for lifting the cryopreservation rack below the horizontal boom. The hook can be driven to move relative to the length direction of the horizontal boom and the axis direction of the column.

[0009] The liquid nitrogen tank is equipped with a positioning plate on the top, and a rod is fixed on the top of the positioning plate. The bottom of the column is provided with a hole that mates with the rod.

[0010] The column is equipped with a positioning component, which is used to lock the relative position between the insertion rod and the insertion hole.

[0011] Furthermore, the positioning component includes a locking rod that is radially elastically inserted into the column, and the outer wall of the locking rod has a locking hole that mates with the centrifugal end of the locking rod. The outer wall of the column has an axially formed first sliding groove, and the centrifugal end of the locking rod is located in the first sliding groove. A first slider located above the locking rod is slidably disposed in the first sliding groove, and the side of the first slider facing the locking rod has an inclined groove that slides and presses against the centrifugal end of the locking rod.

[0012] By driving the first slider to move towards the locking rod in the first groove, the inclined groove slides and presses against the centrifugal end of the locking rod, forcing the centripetal end of the locking rod to engage with the locking hole.

[0013] Furthermore, the inner wall of the column is provided with a second sliding groove for the clamping rod to pass through, and a second slider is provided in the second sliding groove. The second slider is sleeved and fixed on the outside of the clamping rod, and a spring is sleeved on the outside of the clamping rod.

[0014] Furthermore, a connecting block is provided at the top of the first slider, and a limiting block parallel to the lever is rotatably provided in the first slide groove. The limiting block is located above the first slider, and a limiting groove is provided at the top of the connecting block.

[0015] When the first slider does not press the lever, the limiting block is slidably inserted into the limiting groove, and the width of the limiting block facing the first slider is less than or equal to the length of the limiting groove opening.

[0016] When the first slider presses against the locking rod to make the locking rod engage in the locking hole, the width of the limiting block facing the first slider is greater than the length of the limiting groove by rotating the limiting block.

[0017] Furthermore, a damping rod parallel to the locking rod is fixed to one end of the limiting block, and one end of the damping rod is rotatably mounted on the wall of the first sliding groove. A lever is fixed to the other end of the limiting block; the maximum rotation angle of the damping rod is ninety degrees.

[0018] Furthermore, a third motor is installed on the inner side of the column near the top, and the output shaft of the third motor is connected to the bottom of the horizontal boom near the column.

[0019] Furthermore, the horizontal boom has a track groove parallel to its length direction, a track block is slidably arranged in the track groove, a loading platform is provided on the top of the track block, a spool is installed on the top of the loading platform, a rope is wound on the spool, the free end of the rope is connected to a hook, and a through hole is provided at the bottom of the horizontal boom for the rope to pass through and move along the length direction of the horizontal boom.

[0020] Furthermore, pulleys are installed at both ends of the inner side of the horizontal boom, and a tensioned belt is wound between the two pulleys. A connecting plate is fixed to the side of the loading platform, and the bottom of the connecting plate is fixed to the belt body.

[0021] A first motor is installed inside the horizontal boom, and the output shaft of the first motor is connected to the rotation center of one of the pulleys; a second motor is installed on the top of the loading platform, and the output shaft of the second motor is connected to the rotation center of the pulley.

[0022] The beneficial effects of this utility model are reflected in:

[0023] The three-dimensional lifting mechanism for liquid nitrogen tanks of this utility model, through the addition of positioning plates and positioning components, can conveniently and efficiently assemble and disassemble the columns on the liquid nitrogen tanks, thereby facilitating the overall maintenance of the lifting mechanism.

[0024] The three-dimensional lifting mechanism for liquid nitrogen tanks of this invention uses a motor to drive the rotation of the horizontal boom at the top of the column assembly. This allows for precise control of the sample lifting position and path outside the liquid nitrogen tank. Whether it is retrieving samples from deep within the liquid nitrogen tank or precisely placing samples at a specific depth and position, it can be easily achieved, greatly improving the accuracy of sample lifting and effectively avoiding sample collision damage. It is especially suitable for scientific research experimental scenarios with extremely high precision requirements. Attached Figure Description

[0025] In the attached diagram:

[0026] Figure 1 This is a three-dimensional structural diagram of the entire utility model;

[0027] Figure 2 for Figure 1 A schematic diagram of a partial cross-sectional structure;

[0028] Figure 3 for Figure 1 A partial cross-sectional view of the horizontal boom after it has been rotated 90 degrees to the left.

[0029] Figure 4 for Figure 1 A partial cross-sectional view of the central column in a locked state after it is connected to the positioning plate;

[0030] Figure 5 for Figure 4 Enlarged structural diagram at point A;

[0031] Figure 6 for Figure 4 A schematic diagram of the structure when the middle limit block rotates and blocks the connecting block;

[0032] Figure 7 for Figure 4A partial cross-sectional view of the central column in an unlocked state after it is connected to the positioning plate;

[0033] Figure 8 for Figure 7 A schematic diagram of the structure when the middle limit block is inserted into the limit groove before rotation.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Column; 2. Horizontal boom; 3. Hook; 4. Loading platform; 5. Track block; 6. Track groove; 7. Pulley; 8. Belt; 9. First motor; 10. Connecting plate; 11. Second motor; 12. Spool; 13. Guide wheel; 14. Rope; 15. Through hole; 16. Third motor; 17. Positioning plate; 18. Insertion hole; 19. Insertion rod; 20. First slide groove; 21. First slider; 22. Inclined groove; 23. Locking rod; 24. Locking hole; 25. Connecting block; 26. Limiting groove; 27. Limiting block; 28. Damping rotating rod; 29. ​​Pulling block; 30. Limiting rod; 31. Limiting hole; 32. Second slide groove; 33. Second slider; 34. Reception groove; 100. Freezing rack. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments of the utility model, and not all of them. Unless otherwise specified, the embodiments and features described in this application can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of the utility model without creative effort are within the scope of protection of the utility model.

[0037] Please combine Figures 1 to 8 .

[0038] The liquid nitrogen tank three-dimensional lifting mechanism includes a column 1 mounted on the liquid nitrogen tank, a horizontal boom 2 rotatably mounted on the top of the column 1, and a hook 3 for hooking and lifting the cryogenic rack 100 below the horizontal boom 2. The hook 3 can be driven to move relative to the axis of the column 1 along the length of the horizontal boom 2.

[0039] A positioning plate 17 is installed on the top of the liquid nitrogen tank, and the positioning plate 17 is pre-fixed to the top of the liquid nitrogen tank by bolts. A plug rod 19 is fixed to the top of the positioning plate 17, and a plug hole 18 that mates with the plug rod 19 is opened at the bottom of the column 1.

[0040] A positioning component is provided on the column 1, which is used to lock the relative position between the insertion rod 19 and the insertion hole 18.

[0041] In a specific embodiment, the column 1 is first installed on top of the liquid nitrogen tank using a positioning component. When hoisting and transferring samples, the hook 3 on the horizontal boom 2 is rotated to the vicinity of the cryopreservation rack 100 to be retrieved by driving the column 1. The hook 3 is then moved along the length of the horizontal boom 2 to above the cryopreservation rack 100 to be moved. The hook 3 is then moved downward along the axis of the column 1 to land on the target cryopreservation rack 100 and hook the handle of the cryopreservation rack 100. The hook 3 is then moved upward along the axis of the column 1 until the hooked cryopreservation rack 100 is higher than the opening of the liquid nitrogen tank and then stops. The column 1 is then rotated to detach the cryopreservation rack 100 from the opening of the liquid nitrogen tank and reach the target position. Finally, the hook 3 is driven to vertically lower the cryopreservation rack 100 into the target position inside the liquid nitrogen tank, completing the sample retrieval.

[0042] The advantage of this design is that it not only facilitates the assembly and disassembly of column 1 on the liquid nitrogen tank, but also allows operators to precisely control the position and path of sample hoisting from outside the liquid nitrogen tank. Whether it is taking out the sample from deep at the bottom of the liquid nitrogen tank or placing the sample precisely at a specific depth and position, it can be easily achieved, greatly improving the accuracy of sample hoisting and effectively avoiding sample collision damage. It is especially suitable for scientific research experimental scenarios with extremely high precision requirements.

[0043] Compared to traditional methods, operators do not need to spend a lot of time manually adjusting the sample position, and can quickly complete the sample removal and placement. This greatly shortens the time the sample is exposed outside the liquid nitrogen tank and reduces the risk of sample temperature rebound, making it particularly suitable for biological sample processing and other tasks with high time requirements.

[0044] It should be noted that the liquid nitrogen tank can hold several cryopreservation racks 100, and these racks are arranged irregularly at the tank opening. The cryopreservation racks must be placed close together, and they must be lifted and lowered vertically to access them; otherwise, jamming may occur during the lifting and lowering process, damaging the cryopreservation racks and specimens.

[0045] In one embodiment, the positioning component includes a locking rod 23 radially elastically inserted into a column 1. The outer wall of the locking rod 19 has a locking hole 24 that mates with the radial end of the locking rod 23. An axial first sliding groove 20 is formed on the outer wall of the column 1, and the centrifugal end of the locking rod 23 is located in the first sliding groove 20. A first slider 21, located above the locking rod 23, is slidably disposed in the first sliding groove 20. The side of the first slider 21 facing the locking rod 23 has an inclined groove 22 that slides and presses against the centrifugal end of the locking rod 23.

[0046] By driving the first slider 21 to move towards the locking rod 23 in the first slide groove 20, the inclined groove 22 slides and presses against the centrifugal end of the locking rod 23, forcing the centripetal end of the locking rod 23 to be locked into the locking hole 24.

[0047] Thus, when the insertion rod 19 is inserted into the insertion hole 18, the first slider 21 is moved towards the locking rod 23 in the first sliding groove 20, so that the inclined groove 22 slides and presses against the centrifugal end of the locking rod 23, forcing the centripetal end of the locking rod 23 to be locked into the locking hole 24, thereby completing the fixation of the relative position between the insertion rod 19 and the insertion hole 18, and thus realizing the installation of the column 1 on the top positioning plate 17 of the liquid nitrogen tank.

[0048] In one embodiment, the inner wall of the column 1 is provided with a second sliding groove 32 through which the locking rod 23 passes. A second slider 33 is provided in the second sliding groove 32. The second slider 33 is sleeved and fixed on the outside of the locking rod 23. A spring (not shown) is sleeved on the outside of the locking rod 23.

[0049] Thus, when the locking rod 23 is engaged in the locking hole 24, the spring is compressed and deformed. When the inclined groove 22 of the first slider 21 disengages from the centrifugal end of the locking rod 23, the compression force of the spring can help the centripetal end of the locking rod 23 disengage from the locking hole 24, thereby releasing the position lock between the insertion rod 19 and the insertion hole 18, making disassembly convenient.

[0050] In one embodiment, a connecting block 25 is provided on the top of the first slider 21, and a limiting block 27 parallel to the locking rod 23 is rotatably provided in the first slide groove 20. The limiting block 27 is located above the first slider 21, and a limiting groove 26 is formed on the top of the connecting block 25.

[0051] When the first slider 21 does not press the lever 23, the limiting block 27 is slidably inserted into the limiting groove 26, and the width of the limiting block 27 facing the first slider 21 is less than or equal to the length of the groove opening of the limiting groove 26.

[0052] When the first slider 21 presses against the locking rod 23 to make the locking rod 23 engage in the locking hole 24, the width of the limiting block 27 facing the first slider 21 is greater than the length of the limiting groove 26 by rotating the limiting block 27.

[0053] Thus, when the first slider 21 does not press the lever 23, the limiting block 27 is slidably inserted into the limiting groove 26. The width of the limiting block 27 facing the first slider 21 is less than or equal to the length of the groove opening of the limiting groove 26. Then the connecting block 25 can move relative to the limiting block 27 through the limiting groove 26. At this time, the limiting block 27 will not interfere with the movement of the connecting block 25.

[0054] When the first slider 21 presses against the locking rod 23 to make the locking rod 23 engage in the locking hole 24, the opening of the limiting groove 26 of the connecting block 25 is relatively disengaged from the outside of the limiting block 27. By rotating the limiting block 27 in a directional manner, the width of the limiting block 27 facing the first slider 21 is greater than the length of the opening of the limiting groove 26. Therefore, the limiting block 27 cannot enter the limiting groove 26. The limiting block 27 can prevent the connecting block 25 from moving upward in the opposite direction, so as to ensure the stability of the locking state of the locking rod 23 in the locking hole 24.

[0055] In one embodiment, a damping rod 28 parallel to the locking rod 23 is fixed at one end of the limiting block 27. One end of the damping rod 28 is rotatably mounted on the groove wall of the first slide groove 20, and a lever 29 is fixed at the other end of the limiting block 27. The maximum rotation angle of the damping rod 28 is ninety degrees.

[0056] Thus, the lever 29 can cause the limiting block 27 to deflect 90 degrees via the damping rod 28, thereby blocking or releasing the connecting block 25.

[0057] Furthermore, the first slider 21 has a receiving groove 34 on the side facing the insertion hole 18 for the centrifugal end of the locking rod 23 to be locked. The bottom of the receiving groove 34 is connected to the top of the inclined groove 22. The top of the receiving groove 34 has a limiting hole 31 parallel to the insertion hole 18. The outer wall of the locking rod 23 near the centrifugal end is provided with a limiting rod 30 that cooperates with the limiting hole 31.

[0058] Thus, when the first slider 21 moves downward and slides through the inclined groove 22 to press the locking rod 23 to move centrifugally, the centrifugal end of the locking rod 23 will temporarily be locked into the receiving groove 34 after passing through the inclined groove 22 (at this time, the locking rod 23 is fully locked into the locking hole 24), thereby causing the limiting rod 30 to be inserted into the limiting hole 31, ensuring the stability of the position of the locking rod 23 after centrifugal movement, and further improving the locking stability between the locking rod 23 and the locking hole 24.

[0059] In one embodiment, a third motor 16 is installed on the inner side of the column 1 near the top, and the output shaft of the third motor 16 is connected to the bottom of the horizontal boom 2 near the column 1. The third motor 16 can be a controllable geared motor, servo motor, or stepper motor.

[0060] Thus, the horizontal boom 2 and hook 3 can be driven to rotate in the horizontal direction by the third motor 16.

[0061] In one embodiment, a track groove 6 parallel to its length direction is provided in the horizontal boom 2. A track block 5 is slidably arranged in the track groove 6. A loading platform 4 is provided on the top of the track block 5. A spool 12 is installed on the top of the loading platform 4. A rope 14 is wound on the spool 12. The free end of the rope 14 is connected to a hook 3. A through hole 15 is provided at the bottom of the horizontal boom 2, through which the rope 14 can pass and move along the length direction of the horizontal boom 2.

[0062] Both ends of the inner side of the horizontal boom 2 are equipped with pulleys 7, and a tensioned belt 8 is wound between the two pulleys 7. A guide wheel 13 is installed on the top of the loading platform 4, and the free end of the rope 14 passes over the guide wheel 13 and is bolted to the top of the hook 3. A connecting plate 10 is fixed to the side of the loading platform 4, and the bottom of the connecting plate 10 is fixed to the belt body of the belt 8.

[0063] Thus, the load platform 4 can be driven to move along the length of the horizontal boom 2 via the pulley 7, belt 8, and connecting plate 10, thereby adjusting the relative position of the hook 3 along the length of the horizontal boom 2. The relative position of the hook 3 along the axial direction of the column 1 can be adjusted by releasing or rewinding the rope 14 via the reel 12.

[0064] It should be noted that the connecting plate 10 has a bent structure. The top of the connecting plate 10 is bolted to the side of the loading platform 4. A clamp (not shown) is provided on one side of the bottom of the connecting plate 10. The belt body of the belt 8 is located between the connecting plate 4 and the clamp, and the connecting plate 4 and the clamp are fixed by bolts to fix the bottom of the connecting plate 4 on the belt 8 and move synchronously with the belt 8.

[0065] In one embodiment, a first motor 9 is installed inside the horizontal boom 2, and the output shaft of the first motor 9 is connected to the rotation center of one of the pulleys 7. A second motor 11 is installed on the top of the loading platform 4, and the output shaft of the second motor 11 is connected to the rotation center of the pulley 12. Both the first motor 9 and the second motor 11 can be controllable geared motors, servo motors, or stepper motors.

[0066] Thus, the pulley 7 can be driven to rotate by the first motor 9 to adjust the relative position of the hook 3 in the length direction of the horizontal boom 2, and the adjusting wheel 12 can be driven by the second motor 11 to perform rope winding or unwinding operations, thereby adjusting the relative position of the hook 3 in the axial direction of the column 1.

[0067] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

[0068] It should be noted that if the utility model embodiment involves directional indicators (such as up and down), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0069] Furthermore, the meaning of "and / or" throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that simultaneously satisfies A and B. Additionally, if the utility model embodiments involve descriptions of "first," "second," etc., these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" can explicitly or implicitly include at least one of those features. Furthermore, "multiple" refers to two or more. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by the utility model.

Claims

1. A three-dimensional lifting mechanism for a liquid nitrogen tank, characterized in that, It includes a column (1) set on the liquid nitrogen tank, a horizontal boom (2) rotatably set on the top of the column (1), and a hook (3) for hooking the cryogenic rack (100) set below the horizontal boom (2). The hook (3) can be driven to move relative to the axis of the column (1) along the length direction of the horizontal boom (2). A positioning plate (17) is provided on the top of the liquid nitrogen tank. A plug rod (19) is fixed on the top of the positioning plate (17). A plug hole (18) that mates with the plug rod (19) is opened at the bottom of the column (1). A positioning component is provided on the column (1) to lock the relative position between the insertion rod (19) and the insertion hole (18).

2. The three-dimensional lifting mechanism for the liquid nitrogen tank as described in claim 1, characterized in that, The positioning component includes a locking rod (23) that is radially elastically inserted into the column (1). The outer wall of the locking rod (19) is provided with a locking hole (24) that mates with the centripetal end of the locking rod (23). The outer wall of the column (1) is provided with a first sliding groove (20) axially. The centrifugal end of the locking rod (23) is located in the first sliding groove (20). A first slider (21) located above the locking rod (23) is slidably disposed in the first sliding groove (20). The side of the first slider (21) facing the locking rod (23) has an inclined groove (22) that slides and presses against the centrifugal end of the locking rod (23). By driving the first slider (21) to move toward the locking rod (23) in the first groove (20), the inclined groove (22) slides and presses against the centrifugal end of the locking rod (23), forcing the centripetal end of the locking rod (23) to be locked into the locking hole (24).

3. The three-dimensional lifting mechanism for the liquid nitrogen tank as described in claim 2, characterized in that, The inner wall of the column (1) is provided with a second sliding groove (32) through which the clamping rod (23) passes. A second slider (33) is provided in the second sliding groove (32). The second slider (33) is sleeved and fixed on the outside of the clamping rod (23). A spring is sleeved on the outside of the clamping rod (23).

4. The three-dimensional lifting mechanism for the liquid nitrogen tank as described in claim 2, characterized in that, A connecting block (25) is provided on the top of the first slider (21), and a limiting block (27) parallel to the lever (23) is rotatably provided in the first slide groove (20). The limiting block (27) is located above the first slider (21), and a limiting groove (26) is opened on the top of the connecting block (25). When the first slider (21) does not press the lever (23), the limiting block (27) slides into the limiting groove (26), and the width of the limiting block (27) facing the first slider (21) is less than or equal to the length of the groove opening of the limiting groove (26). When the first slider (21) presses against the locking rod (23) to make the locking rod (23) engage in the locking hole (24), the width of the limiting block (27) facing the first slider (21) is greater than the length of the limiting groove (26) by rotating the limiting block (27).

5. The three-dimensional lifting mechanism for a liquid nitrogen tank as described in claim 4, characterized in that, One end of the limiting block (27) is fixed with a damping rotating rod (28) parallel to the locking rod (23). One end of the damping rotating rod (28) is rotatably set on the groove wall of the first slide (20). The other end of the limiting block (27) is fixed with a lever (29). The maximum rotation angle of the damping rotating rod (28) is ninety degrees.

6. The three-dimensional lifting mechanism for a liquid nitrogen tank as described in claim 1, characterized in that, A third motor (16) is installed on the inner side of the column (1) near the top. The output shaft of the third motor (16) is connected to the bottom of the horizontal boom (2) near the side of the column (1).

7. The three-dimensional lifting mechanism for a liquid nitrogen tank as described in claim 1, characterized in that, The horizontal boom (2) has a track groove (6) parallel to its length direction. A track block (5) is slidably arranged in the track groove (6). A loading platform (4) is set on the top of the track block (5). A spool (12) is installed on the top of the loading platform (4). A rope (14) is wound on the spool (12). The free end of the rope (14) is connected to the hook (3). The bottom of the horizontal boom (2) has a through hole (15) through which the rope (14) can pass and move along the length direction of the horizontal boom (2).

8. The three-dimensional lifting mechanism for a liquid nitrogen tank as described in claim 7, characterized in that, Both ends of the inner side of the horizontal boom (2) are equipped with pulleys (7), and a tensioned belt (8) is wound between the two pulleys (7). A connecting plate (10) is fixed on the side of the loading platform (4), and the bottom of the connecting plate (10) is fixed on the belt body of the belt (8). A first motor (9) is installed inside the horizontal boom (2), and the output shaft of the first motor (9) is connected to the rotation center of one of the pulleys (7); a second motor (11) is installed on the top of the loading platform (4), and the output shaft of the second motor (11) is connected to the rotation center of the pulley (12).

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