A lifting device for a liquid nitrogen tank

Abstract

The utility model relates to a kind of lifting device of liquid nitrogen tank, including lifting pole main part;Linear guide and fixed plate are sequentially arranged in the lower portion of lifting pole main part, the top end of stand column is connected by sliding through sliding block on linear guide;Lifting pole main part is sequentially provided with tow chain, screw support pedestal, speed reducer and pulley fixing piece from left to right in the upper portion, first bearing seat and second bearing seat are arranged on screw support pedestal, for carrying screw rod assembly, screw rod assembly is equipped with screw rod sensing baffle, one end of screw rod assembly is connected bevel gear;Speed reducer driving gear, gear is engaged with bevel gear, heavy chain is wound on gear shaft;The bottom end of heavy chain is connected with hook.The utility model has the advantages of automatic control, accurate positioning, multiple safety protection, etc., completely solve the safety hidden trouble and low efficiency problem existing in traditional manual operation.

Description

Technical Field

[0001] This utility model relates to the field of cryogenic container operation equipment technology, and in particular to a lifting device for a liquid nitrogen tank. Background Technology

[0002] In modern industry and scientific research, liquid nitrogen is widely used as an important cryogenic medium in fields such as biological sample preservation, cryogenic material processing, and superconducting technology. Liquid nitrogen tanks, as the primary containers for storing liquid nitrogen, are typically designed to be tall to maintain the cryogenic environment and improve storage efficiency. However, this tall design brings significant operational challenges and safety risks.

[0003] Currently, the following technical problems mainly exist in the daily use of liquid nitrogen tanks: (1) High safety risk: Liquid nitrogen has an extremely low temperature (-196℃). When manually handling or retrieving items from liquid nitrogen tanks, direct contact may result in severe frostbite. In particular, when retrieving items from deep liquid nitrogen tanks, operators need to lean forward excessively, increasing the risk of falling into the tank.

[0004] (2) Low operational efficiency: Traditional manual operation requires operators to manually extract samples using simple lifting tools, which is slow and laborious. In laboratory environments where samples need to be frequently stored and retrieved, this operation method seriously affects work efficiency.

[0005] (3) Poor positioning accuracy: It is difficult to achieve precise positioning by manual operation, especially when extracting heavy samples, which is prone to shaking, causing the sample to collide with the tank wall, resulting in sample damage or liquid nitrogen splashing out.

[0006] (4) Lack of automated control: Most of the existing simple lifting devices rely on manual operation and lack automatic limit and protection functions. During operation, they are prone to over-lifting or over-lowering, which poses a safety hazard.

[0007] (5) Insufficient adaptability: Different sizes of liquid nitrogen tanks require different lifting equipment. Existing lifting devices often lack flexible adjustment capabilities and cannot meet the needs of various sizes of liquid nitrogen tanks.

[0008] Therefore, this application proposes a dedicated liquid nitrogen tank lifting device to solve the above-mentioned technical problems. Utility Model Content

[0009] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a special lifting device for liquid nitrogen tanks that can achieve precise positioning and automatic control.

[0010] The purpose of this utility model is achieved as follows: A lifting device for a liquid nitrogen tank includes a lifting rod body and a column; a linear guide rail and a fixing plate are arranged sequentially below the lifting rod body, the linear guide rail is located on the left side of the fixing plate, and a slider is slidably mounted on the linear guide rail, the slider being connected to the top of the column; The lifting boom body is topped with, from left to right, a drag chain connecting plate, a lead screw support base, a reduction motor, and a pulley fixing component. A drag chain is mounted on the drag chain connecting plate, with one end of the drag chain connected to the connecting plate. The lead screw support base has a first bearing seat and a second bearing seat, both of which have lead screw assemblies. A lead screw sensing baffle is fitted onto the lead screw assembly and positioned between the first and second bearing seats. One end of the lead screw assembly passes through the second bearing seat to reach the first bearing seat, and the other end is connected to a bevel gear. The lead screw support base also has a first limit switch, positioned in front of the first bearing seat. The output end of the geared motor is connected to a gear shaft, and a gear is fitted on the top of the gear shaft. The gear meshes with a bevel gear, and the bevel gear achieves shaft transmission with the gear through conical surface meshing. A heavy-duty chain is wound on the gear shaft. The lifting rod body is provided with two front and rear pulley fixing parts, and a pulley is provided between the two pulley fixing parts; one end of the heavy chain extends vertically downward after being guided by the pulley and extends into the lifting rod body and the fixing plate; the bottom surface of the fixing plate is provided with a second limit switch, which is located on the right side of the heavy chain. The bottom end of the heavy-duty chain is connected to a chain fixing component, and a hook is connected through the chain fixing component. The hook is used to suspend the liquid nitrogen tank. The heavy-duty chain is also equipped with a chain retaining ring, which is located above the chain fixing component.

[0011] A lifting device for a liquid nitrogen tank, wherein the length of the linear guide rail is greater than the length of the fixed plate, providing a range of horizontal movement.

[0012] A lifting device for a liquid nitrogen tank, wherein a support base is provided at the bottom end of the column and a column cover is provided on the outside of the column.

[0013] A lifting device for a liquid nitrogen tank, wherein an upper chain guard plate and a lower chain guard plate are fitted on the gear shaft, and a washer is fitted on the gear shaft between the upper chain guard plate and the lower chain guard plate, and a heavy-duty chain is wound around the outside of the washer.

[0014] A lifting device for a liquid nitrogen tank, wherein a pulley fixing shaft is provided between two pulley fixing parts, and the pulley fixing shaft is connected to the pulleys through bearings.

[0015] A lifting device for a liquid nitrogen tank, wherein the lifting rod body and the fixing plate are respectively provided with through holes at the positions where the heavy chain falls, to ensure that the chain moves vertically.

[0016] A lifting device for a liquid nitrogen tank, wherein a protective cover is provided above the main body of the lifting rod, which covers the lifting, transmission and guiding mechanisms such as the drag chain, lead screw assembly, gears and pulleys.

[0017] A lifting device for a liquid nitrogen tank, wherein the bottom surface of a slider on a linear guide rail is connected to the top of a column via a rotary reducer.

[0018] A lifting device for a liquid nitrogen tank, wherein a guide sleeve is provided at the lower part of the heavy chain to reduce the swaying of the chain during the lifting process.

[0019] Compared with the prior art, the beneficial effects of this utility model are: This invention achieves safe, efficient, and precise hoisting of liquid nitrogen tanks through the coordinated design of the support structure, lifting system, horizontal movement system, and control system. It possesses the following specific advantages: (1) Operational safety is significantly improved: Enables remote automated operation, avoiding direct contact between personnel and liquid nitrogen; multiple limit protections prevent damage to the equipment due to excessive lifting and lowering; anti-sway design ensures stable and reliable lifting and lowering process.

[0020] (2) Operation efficiency is greatly improved: electric lifting replaces manual operation, greatly increasing the lifting speed; precise positioning function reduces adjustment time; adapts to frequent access needs and improves work efficiency.

[0021] (3) Positioning accuracy is significantly improved: Guide rails are used to ensure vertical movement accuracy, achieve precise position control, reduce sample shaking, and prevent liquid nitrogen from splashing out.

[0022] (4) Extended service life: The heavy-duty chain design provides greater load-bearing capacity; the bearings and transmission components work together to reduce wear and ensure long-term stable operation.

[0023] (5) High adaptability: Adjustable lifting height to adapt to liquid nitrogen tanks of different depths; provides a variety of hook accessories to adapt to different models of liquid nitrogen tanks. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model.

[0025] Figure 2 This is a schematic diagram of the structure of this utility model after the protective cover has been added.

[0026] Figure 3 for Figure 1 Enlarged view of a portion of point A in the middle.

[0027] in: 1. Lifting boom body; 2. Linear guide rail; 3. Cable drag chain; 4. Cable drag chain connecting plate; 5. First limit switch; 6. First bearing seat; 7. Lead screw sensing baffle; 8. Lead screw assembly; 9. Second bearing seat; 10. Bevel gear; 11. Gear; 12. Gear shaft; 13. Upper chain guard plate; 14. Lower chain guard plate; 15. Gear reducer motor; 16. Lead screw support base; 17. Pulley fixing component; 18. Bearing; 19. Pulley; 20. Pulley fixing shaft; 21. Second limit switch; 22. Fixing plate; 23. Heavy-duty chain; 24. Chain retaining ring; 25. Chain fixing component; 26. Hook; 27. Column; 28. Column cover. Detailed Implementation

[0028] To better understand the technical solution of this utility model, a detailed description will be provided below in conjunction with relevant illustrations. It should be understood that the specific embodiments described below are not intended to limit the specific implementation of the technical solution of this utility model, but are merely possible implementations of the technical solution of this utility model. It should be noted that the descriptions of the positional relationships of the components herein, such as component A being located above component B, are based on the relative positions of the components in the illustrations and are not intended to limit the actual positional relationships of the components. Example 1

[0029] See Figures 1-3 , Figure 1 A schematic diagram of a lifting device for a liquid nitrogen tank is shown. As illustrated, the lifting device for a liquid nitrogen tank according to this invention includes a support structure, a lifting system, a horizontal movement system, and a control system. Specific details are as follows: Supporting structure: Includes the main body of the lifting boom 1 and the column 27; The lifting rod body 1 is made of high-strength steel structure, and a linear guide rail 2 and a fixing plate 22 are arranged in sequence below the lifting rod body 1; The linear guide 2 is located on the left side of the fixed plate 22, and the length of the linear guide 2 is greater than the length of the fixed plate 22, providing a sufficient range of horizontal movement. A slider is slidably mounted on the linear guide rail 2. The top of the column 27 is connected to the slider via a rotary reducer, enabling the lifting rod body 1 to rotate 360°. The bottom of the column 27 is provided with a support base, and the outside of the column 27 is provided with a column cover 28 to provide stable support and protection.

[0030] Lifting system: The upper part of the lifting rod body 1 is provided with a drag chain connecting plate 4, a screw support base 16, a reduction motor 15 and a pulley fixing component 17 from left to right. The cable chain connecting plate 4 is provided with a cable chain 3. One end of the cable chain 3 is connected to the cable chain connecting plate 4. The function of the cable chain 3 is to protect the cable and prevent it from swaying left and right during movement or rotation, thereby avoiding the cable from getting stuck or causing other potential risks. The lead screw support base 16 is provided with a first bearing seat 6 and a second bearing seat 9, which are used to support the lead screw assembly 8. A lead screw sensing baffle 7 is sleeved on the lead screw assembly 8. The lead screw sensing baffle 7 is disposed between the first bearing seat 6 and the second bearing seat 9 and is used for position detection. The output end of the geared motor 15 is connected to the gear shaft 12, and a gear 11 is sleeved on the top of the gear shaft 12, which drives the lifting motion through the transmission of the gear 11.

[0031] Transmission mechanism: One end of the lead screw assembly 8 passes through the second bearing seat 9 to reach the first bearing seat 6, and the other end is connected to the bevel gear 10; The gear 11 meshes with the bevel gear 10, and the bevel gear 10 achieves intersecting shaft transmission with the gear 11 through conical surface meshing. The gear shaft 12 is also fitted with an upper chain guard plate 13 and a lower chain guard plate 14. A washer is fitted on the gear shaft 12 between the upper chain guard plate 13 and the lower chain guard plate 14. A heavy-duty chain 23 is wound around the outside of the washer to support the lifting weight.

[0032] Guidance system: The lifting rod body 1 is provided with two front and rear pulley fixing parts 17, and a pulley fixing shaft 20 is provided between the two pulley fixing parts 17. The pulley fixing shaft 20 is connected to the pulley 19 through a bearing 18. One end of the heavy chain 23 extends vertically downwards from the lifting rod body 1 and the fixing plate 22 after being guided by the pulley 19; The lifting rod body 1 and the fixing plate 22 are respectively provided with through holes at the positions where the heavy chain 23 falls, to ensure that the chain moves vertically.

[0033] Hanging device: The bottom end of the heavy chain 23 is connected to the chain fastener 25, and the chain fastener 25 is connected to the hook 26, which is used to hang the liquid nitrogen tank; The heavy-duty chain 23 is also provided with a chain retainer ring 24, which is located above the chain fixing member 25 and maintains a fixed distance from the chain fixing member; In this embodiment, the distance between the chain retainer 24 and the chain fastener 25 does not exceed the distance between three links of the heavy chain 23.

[0034] Control system: The lead screw support base 16 is also provided with a first limit switch 5, which is located on the front side of the first bearing seat 6; the bottom surface of the fixing plate 22 is provided with a second limit switch 21, which is located on the right side of the heavy chain 23; the first limit switch 5 and the second limit switch 21 are used for position detection and safety protection. The lead screw sensing baffle 7 cooperates with the first limit switch 5 to detect the horizontal movement limit position; The chain retaining ring 24 cooperates with the second limit switch 21 to detect the lifting limit position.

[0035] A protective cover is also provided above the main body 1 of the lifting rod, which covers the lifting, transmission and guiding mechanisms such as the drag chain 3, the lead screw assembly 8, the gear 11 and the pulley 19.

[0036] In this embodiment, an anti-sway stabilizing device is also provided: The lower part of the heavy chain 23 is provided with a guide sleeve to reduce the swaying of the chain during the lifting process; A mechanical snap-lock limiter or friction damping device is installed at the position where the heavy chain 23 passes over the pulley 19 to prevent the chain from slipping off the track due to inertia; a gear coupling is installed between the geared motor 15 and the gear shaft 12, with a built-in damper to buffer the impact during start / stop; the damper works in conjunction with the limit switch, and when the chain approaches the limit position, the damper automatically increases the resistance and works with the switch to cut off the power input to avoid overtravel damage; The hook 26 adopts a self-locking structure to ensure safety during the hanging process.

[0037] In this embodiment, an intelligent control system is also provided: An encoder is installed on the heavy-duty chain 23 to monitor the lifting position and speed in real time; The geared motor 15 is equipped with a remote control function to achieve remote control.

[0038] In this embodiment, hook accessories of various specifications are provided to adapt to different models of liquid nitrogen tanks.

[0039] Working principle: This utility model provides a lifting device for a liquid nitrogen tank, with the following operation procedure: 1. Position the hook directly above the liquid nitrogen tank using the horizontal movement system; 2. Activate the lifting system and lower the hook to a suitable height; 3. After hoisting the liquid nitrogen tank, start the lifting procedure; 4. The system will automatically stop at the set position; 5. Move the liquid nitrogen tank to the target location by horizontal movement.

[0040] The operating principle of the lifting device for a liquid nitrogen tank according to this utility model is as follows: (1) Vertical lifting motion: The geared motor operates, driving the gear shaft to rotate, which in turn drives the gears to rotate. The heavy-duty chain wound around the gear shaft follows the rotation of the gear shaft, achieving the lifting and lowering movement. Pulleys act as guides, ensuring that the heavy-duty chain rises or falls vertically, thereby driving the hook to achieve precise lifting and lowering positioning.

[0041] (2) Horizontal movement adjustment: The top of the column is connected to the slider of the linear guide rail via a rotary reducer. The left and right positions of the linear guide rail can be adjusted manually or by motor drive. The rotary reducer enables the linear guide rail to drive the chain to rotate 360°, thereby adjusting the horizontal position of the hook. The function of the cable chain is to protect the cable, prevent it from swaying left and right during movement or rotation, and avoid the cable getting stuck or causing other potential risks.

[0042] (3) Security protection mechanism: When the heavy-duty chain rises, the chain retaining ring touches the second limit switch, and the reduction motor automatically stops to prevent over-lifting. When the heavy-duty chain descends, the gear drives the bevel gear to rotate, and the rotation of the bevel gear drives the lead screw assembly to move. The lead screw sensing baffle on the lead screw assembly moves to the left, and when it touches the first limit switch, the reduction motor automatically stops to ensure safe operation.

[0043] This utility model discloses a lifting device for liquid nitrogen tanks. Through the innovative collaborative design of the support structure, lifting system, horizontal movement system, and control system, it achieves safe, efficient, and precise lifting operations for liquid nitrogen tanks. The device features automated control, precise positioning, and multiple safety protections, completely solving the safety hazards and inefficiencies of traditional manual operation. It is particularly suitable for the operation of liquid nitrogen tanks in laboratory and industrial environments.

[0044] The above are merely specific application examples of this utility model and do not constitute any limitation on the scope of protection of this utility model. All technical solutions formed by equivalent transformations or equivalent substitutions fall within the scope of protection of this utility model.

Claims

1. A lifting device for a liquid nitrogen tank, characterized in that: It includes a lifting rod body (1) and a column (27); a linear guide rail (2) and a fixing plate (22) are arranged in sequence below the lifting rod body (1). The linear guide rail (2) is located on the left side of the fixing plate (22). A slider is slidably provided on the linear guide rail (2), and the slider is connected to the top of the column (27). The lifting rod body (1) is provided with a drag chain connecting plate (4), a screw support base (16), a reduction motor (15), and a pulley fixing component (17) from left to right above it. The drag chain connecting plate (4) is provided with a drag chain (3), one end of which is connected to the drag chain connecting plate (4). The screw support base (16) is provided with a first bearing seat (6) and a second bearing seat (9). The first bearing seat (6) and the second bearing seat (9) are provided with a screw assembly (8). The screw assembly (8) is fitted with a screw sensing baffle (7), which is located between the first bearing seat (6) and the second bearing seat (9). One end of the screw assembly (8) passes through the second bearing seat (9) to reach the first bearing seat (6), and the other end is connected to a bevel gear (10). The screw support base (16) is also provided with a first limit switch (5), which is located on the front side of the first bearing seat (6). The output end of the geared motor (15) is connected to the gear shaft (12). A gear (11) is fitted on the top of the gear shaft (12). The gear (11) meshes with the bevel gear (10). The bevel gear (10) achieves intersecting shaft transmission with the gear (11) through conical surface meshing. A heavy chain (23) is wound on the gear shaft (12). The lifting rod body (1) is provided with two front and rear pulley fixing parts (17), and a pulley (19) is provided between the two pulley fixing parts (17); one end of the heavy chain (23) extends vertically downward from the lifting rod body (1) and the fixing plate (22) after being guided by the pulley (19); the bottom surface of the fixing plate (22) is provided with a second limit switch (21), and the second limit switch (21) is located on the right side of the heavy chain (23); The bottom end of the heavy chain (23) is connected to the chain fixing member (25), and the chain fixing member (25) is connected to the hook (26), which is used to hang the liquid nitrogen tank; the heavy chain (23) is also provided with a chain retaining ring (24), which is located above the chain fixing member (25).

2. The lifting device for a liquid nitrogen tank according to claim 1, characterized in that: The length of the linear guide (2) is greater than the length of the fixed plate (22), providing a range of horizontal movement.

3. The lifting device for a liquid nitrogen tank according to claim 1, characterized in that: The bottom end of the column (27) is provided with a support base, and the outside of the column (27) is provided with a column cover (28).

4. The lifting device for a liquid nitrogen tank according to claim 1, characterized in that: The gear shaft (12) is also fitted with an upper chain guard plate (13) and a lower chain guard plate (14). A washer is fitted on the gear shaft (12) between the upper chain guard plate (13) and the lower chain guard plate (14), and a heavy chain (23) is wound around the outside of the washer.

5. The lifting device for a liquid nitrogen tank according to claim 1, characterized in that: A pulley fixing shaft (20) is provided between the two pulley fixing parts (17), and the pulley fixing shaft (20) is connected to the pulley (19) through a bearing (18).

6. The lifting device for a liquid nitrogen tank according to claim 1, characterized in that: The lifting rod body (1) and the fixing plate (22) are respectively provided with through holes at the positions where the heavy chain (23) falls, to ensure that the chain moves vertically.

7. The lifting device for a liquid nitrogen tank according to claim 1, characterized in that: The lifting rod body (1) is also provided with a protective cover, which covers the lifting, transmission and guiding mechanisms of the drag chain (3), screw assembly (8), gear (11) and pulley (19) inside the protective cover.

8. The lifting device for a liquid nitrogen tank according to claim 1, characterized in that: The bottom surface of the slider on the linear guide (2) is connected to the top of the column (27) through a rotary reducer.

9. The lifting device for a liquid nitrogen tank according to claim 1, characterized in that: The lower part of the heavy chain (23) is provided with a guide sleeve to reduce the swing of the chain during the lifting process.

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