Liquid nitrogen transfer device
By designing a liquid nitrogen transfer device, using automated clamping and dumping technology, the problems of personnel injury and waste in liquid nitrogen transfer are solved, and efficient and safe replenishment of liquid nitrogen storage tanks is achieved.
Patent Information
- Application Number
- CN202422557539.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-22
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-10-22
AI Technical Summary
The existing liquid nitrogen transfer methods rely on human labor or liquid nitrogen pressure, resulting in personnel injury, fatigue and waste of liquid nitrogen, and are inefficient.
A liquid nitrogen transfer device is designed, including a fixed frame, a lifting box and a clamping arm. Using a lifting cylinder, a clamping drive mechanism and an inclination adjustment mechanism, the liquid nitrogen tank is automatically clamped and poured, so as to achieve no manual manual transfer of liquid nitrogen.
It reduces the labor intensity of staff, improves the efficiency of liquid nitrogen transfer, reduces liquid nitrogen loss, and ensures the health of staff.
Smart Images
Figure CN223163141U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of liquid transfer, in particular to a liquid nitrogen transfer device. Background Art
[0002] Embryo freezing is the only proven method in the world for preserving fertility. This technique involves freezing embryos obtained through in vitro fertilization (IVF) and storing them in liquid nitrogen at -196°C for extended periods of time.
[0003] During the use of liquid nitrogen, a small-volume liquid nitrogen transfer tank is used to refill a large-volume liquid nitrogen storage tank. Currently, there are two methods for refilling liquid nitrogen: one relies on manpower and the other relies on liquid nitrogen pressure. When relying on manpower to transfer liquid nitrogen, there are many liquid nitrogen storage tanks (dozens). For safety reasons, liquid nitrogen must be added twice a week, which consumes a lot of manpower. If one person is constantly doing this heavy physical work, it will cause personal injury, such as back injury, spinal injury, muscle injury, etc.; heavy physical work will destroy the working environment, cause fatigue, reduce work efficiency, and waste manpower.
[0004] When transferring liquid nitrogen based on the pressure of liquid nitrogen, the machine and the liquid nitrogen tank must be turned on in advance, and the liquid nitrogen tank must be opened in advance to be integrated with the liquid nitrogen tank. The liquid nitrogen must then evaporate and the pressure must increase. Once the pressure reaches a certain level, the liquid nitrogen will flow from the small liquid nitrogen tank into the large liquid nitrogen tank. During this process, the loss of liquid nitrogen is significant; adding 15L of liquid nitrogen also wastes 15L. This process also takes a significant amount of time, waiting for the liquid nitrogen to evaporate, increase the pressure, and wait for the liquid nitrogen to be transferred. Furthermore, a significant amount of manpower is required, as specialized liquid nitrogen vaporizers are required, so manual labor is still required to add the liquid nitrogen from the transfer tank to the liquid nitrogen vaporizer. Utility Model Content
[0005] In order to solve the above problems, the utility model provides a liquid nitrogen transfer device, which can reduce the difficulty of liquid nitrogen transfer, eliminate the need for manual handling, and effectively avoid physical injuries to workers.
[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0007] A liquid nitrogen transfer device comprises a fixed frame and a lifting box, wherein support frames are respectively provided on both sides of the bottom of the fixed frame, one end of the support frame is fixedly connected to the fixed frame, and a roller is rotatably provided on the other end; a universal wheel is provided on the side of the bottom of the fixed frame facing away from the support frame;
[0008] The lifting box is slidably arranged in the fixed frame. One side of the lifting box is fixedly connected to the inner wall of the top of the fixed frame through a lifting oil cylinder. On the other side of the lifting box, there are two clamping arms. The clamping arm includes a first arm body, a second arm body and a third arm body. One end of the first arm body is slidably connected to the lifting box through a clamping driving mechanism. The other end of the first arm body is rotatably connected to one end of the second arm body, and the second arm body is connected to the lifting box through an inclination adjusting mechanism to adjust the included angle between the second arm body and the first arm body; the third arm body is fixedly connected to the end of the second arm body far from the first arm body.
[0009] Further, both the first arm body and the support frame are located on one side of the fixed frame, and the first arm body is parallel to the support frame, and the third arm body is perpendicular to the second arm body.
[0010] Further, a box cavity is arranged in the lifting box, and a sliding port communicating with the lifting box is arranged on one side of the lifting box; the clamping driving mechanism includes sliding blocks and a driving motor. There are two sliding blocks, and the sliding blocks are slidably arranged in the box cavity. One end of the first arm body far from the second arm body is embedded into the box cavity through the sliding port and fixedly connected to the corresponding sliding block, and the driving motor is used to drive the two sliding blocks.
[0011] Further, a threaded rod is rotatably arranged in the box cavity. The thread directions at both ends of the threaded rod are opposite, and both ends of the threaded rod are respectively threadedly penetrated through the two sliding blocks. The threaded rod is fixedly sleeved with a first gear. The driving motor is fixedly arranged in the box cavity, and an output shaft of the driving motor is provided with a second gear meshing with the first gear, so that the two sliding blocks can move in opposite directions.
[0012] Further, a mounting member is fixedly arranged on the side of the lifting box facing away from the clamping arm, and the mounting member is fixedly connected to the lifting oil cylinder;
[0013] Sliding rods are respectively arranged on both sides of the lifting oil cylinder. The sliding rods are located in the fixed frame, and both ends of the sliding rods are respectively fixedly connected to the fixed frame. The sliding rods are slidably penetrated through the mounting member.
[0014] Further, a reserved port is recessed between the bottom of the mounting member and the bottom of the lifting box, so that when the clamping arm descends to the ground, the mounting member abuts against the fixed frame through the reserved port.
[0015] Furthermore, the tilt adjustment mechanism includes a tilt cylinder, two of which are provided and located on both sides of the clamping arm, one end of the tilt cylinder is rotatably connected to the second arm body, and the other end is rotatably connected to the lifting box.
[0016] Furthermore, a cavity is provided in the third arm body, and a slide groove connected to the cavity is provided on the side of the third arm body facing the lifting box. A limit cylinder is fixedly provided in the cavity, and a limit rod is provided at the driving end of the limit cylinder. One end of the limit rod is fixedly connected to the driving end of the limit cylinder, and the other end passes through the slide groove to the outside of the cavity, and the limit rod is slidably connected to the slide groove.
[0017] Furthermore, a supporting plate is fixedly provided on one side opposite to the two third arm bodies of the clamping arm, and a side of the supporting plate facing the lifting box is provided with a curved surface.
[0018] The beneficial effects of the utility model are:
[0019] 1. Under the action of the lifting cylinder, the lifting box can move up and down along the fixed frame so that the second arm body can move to the bottom of the liquid nitrogen tank. The clamping driving mechanism makes the second arm bodies approach each other, so that the two second arm bodies can clamp the base of the liquid nitrogen tank. Then, the tilt adjustment mechanism is used to tilt the end of the second arm body away from the first arm body toward the ground at a certain angle, and the liquid nitrogen tank can be pressed against the third arm body, so that the bottom and one side of the liquid nitrogen tank are respectively supported on the second arm body and the third arm body, thereby realizing the loading of the liquid nitrogen tank onto the clamping arm; after controlling the lifting box to move upward to a suitable position, the tilt adjustment mechanism is used to make the end of the second arm body away from the first arm body gradually tilt toward the ground, and the liquid nitrogen in the liquid nitrogen tank can be poured into the liquid nitrogen storage tank, thereby realizing the liquid nitrogen replenishment of the liquid nitrogen storage tank. During the liquid nitrogen replenishment process of the liquid nitrogen storage tank, no manual labor is required, which effectively reduces the labor intensity of the staff and ensures the health of the staff. In addition, the utility model transfers liquid nitrogen by dumping, improves the liquid nitrogen transfer efficiency, and reduces the loss of liquid nitrogen.
[0020] 2. Since the threads at both ends of the threaded rod are in opposite directions, the two first arms move in opposite directions at the same time under the drive of the drive motor, so that the second arm can clamp and release the base of the liquid nitrogen tank. Under the action of the gravity of the liquid nitrogen tank itself, the protruding part of the bottom of the liquid nitrogen tank can abut against the second arm. At the same time, the second arm is slightly tilted to the ground, so that the liquid nitrogen tank can be stably fixed between the two clamping arms. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a structural schematic diagram of a liquid nitrogen transfer device according to a preferred embodiment of the present invention.
[0022] Figure 2 It is a front view schematic diagram of a liquid nitrogen transfer device according to a preferred embodiment of the present utility model.
[0023] Figure 3 It is a schematic diagram of a lifting oil cylinder of a liquid nitrogen transfer device according to a preferred embodiment of the present utility model.
[0024] Figure 4 It is a schematic diagram of a threaded rod of a liquid nitrogen transfer device according to a preferred embodiment of the present utility model.
[0025] Figure 5 It is a schematic diagram of a driving motor of a liquid nitrogen transfer device according to a preferred embodiment of the present utility model.
[0026] Figure 6 It is a schematic diagram of a third arm body of a liquid nitrogen transfer device according to a preferred embodiment of the present utility model.
[0027] Figure 7 It is a schematic diagram of a limiting rod of a liquid nitrogen transfer device according to a preferred embodiment of the present utility model.
[0028] In the figure, 1 - fixed frame, 101 - roller, 102 - universal wheel, 11 - support frame, 12 - lifting oil cylinder, 121 - sliding rod, 2 - lifting box, 201 - box cavity, 202 - sliding opening, 21 - mounting member, 22 - reserved opening, 3 - clamping arm, 31 - first arm body, 32 - second arm body, 33 - third arm body, 331 - cavity, 332 - chute, 34 - tilting oil cylinder, 4 - sliding block, 41 - driving motor, 42 - threaded rod, 431 - first gear, 432 - second gear, 5 - limiting cylinder, 51 - limiting rod, 6 - supporting plate, 61 - arc surface, 7 - control box. Specific embodiments
[0029] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.
[0030] It should be noted that when a component is referred to as "fixed to" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.
[0031] Unless otherwise defined, all technical and scientific terms used in this article have the same meaning as commonly understood by those skilled in the technical field to which this utility model belongs. The terms used in the specification of this utility model in this article are only for the purpose of describing specific embodiments and are not intended to limit this utility model. The term "and / or" used in this article includes any and all combinations of one or more of the related listed items.
[0032] Please also refer to Figures 1 to 7 , a preferred embodiment of the present utility model includes a fixed frame 1 and a lifting box 2.
[0033] On both sides of the bottom of the fixed frame 1, support frames 11 are respectively provided. One end of the support frame 11 is fixedly connected to the fixed frame 1, and the other end is rotatably provided with rollers 101. On the side of the bottom of the fixed frame 1 facing away from the support frame 11, universal wheels 102 are provided. The universal wheels 102 in this embodiment are universal wheels with brakes. Under the action of the rollers 101 and the universal wheels 102, it is convenient to move the fixed frame 1 to the required position.
[0034] The lifting box 2 is slidably disposed in the fixed frame 1, and one side of the lifting box 2 is fixedly connected to the inner wall of the top of the fixed frame 1 through a lifting oil cylinder 12.
[0035] As Figure 1 , Figure 4 , Figure 5 shown, on the other side of the lifting box 2, two clamping arms 3 are provided. The clamping arm 3 includes a first arm body 31, a second arm body 32 and a third arm body 33. One end of the first arm body 31 is slidably connected to the lifting box 2 through a clamping driving mechanism. The other end of the first arm body 31 is rotatably connected to one end of the second arm body 32, and the second arm body 32 is connected to the lifting box 2 through an inclination adjusting mechanism to adjust the included angle between the second arm body 32 and the first arm body 31; the third arm body 33 is fixedly connected to the end of the second arm body 32 far from the first arm body 31.
[0036] In this embodiment, the first arm body 31 and the support frame 11 are both located on one side of the fixed frame 1, and the first arm body 31 is parallel to the support frame 11, and the third arm body 33 is perpendicular to the second arm body 32. Preferably, an arc-shaped notch can be recessed on the opposite side of the two second arm bodies 32 to increase the contact area between the second arm bodies 32 and the liquid nitrogen tank.
[0037] Under the action of the lifting oil cylinder 12, the lifting box 2 can move up and down along the fixed frame 1, so that the second arm body 32 can move to the bottom of the liquid nitrogen tank. Through the clamping drive mechanism, the second arm bodies 32 are made to approach each other, so that the two second arm bodies 32 can clamp the base of the liquid nitrogen tank. Then, through the tilting adjustment mechanism, the end of the second arm body 32 away from the first arm body 31 is tilted towards the ground by a certain angle, and the liquid nitrogen tank can press against the third arm body 33, so that the bottom and one side of the liquid nitrogen tank are respectively supported on the second arm body 32 and the third arm body 33, thus realizing the loading of the liquid nitrogen tank onto the clamping arm 3; after controlling the lifting box 2 to move up to a suitable position, using the tilting adjustment mechanism, the end of the second arm body 32 away from the first arm body 31 is gradually tilted towards the ground, and the liquid nitrogen in the liquid nitrogen tank can be poured into the liquid nitrogen storage tank, thus realizing the liquid nitrogen replenishment of the liquid nitrogen storage tank.
[0038] In this embodiment, no manual operation is required during the liquid nitrogen replenishment process of the liquid nitrogen storage tank, effectively reducing the labor intensity of the staff and ensuring the health of the staff. Moreover, the utility model transfers liquid nitrogen by pouring, improving the liquid nitrogen transfer efficiency and reducing the loss of liquid nitrogen.
[0039] As Figure 2 、 Figure 3 and Figure 5 As shown, a mounting member 21 is fixedly provided on the side of the lifting box 2 facing away from the clamping arm 3, and the mounting member 21 is fixedly connected to the lifting oil cylinder 12;
[0040] Slide rods 121 are respectively arranged on both sides of the lifting oil cylinder 12. The slide rods 121 are located inside the fixed frame 1, and both ends of the slide rods 121 are fixedly connected to the fixed frame 1. The slide rods 121 slidably pass through the mounting member 21.
[0041] The bottom of the mounting member 21 and the bottom of the lifting box 2 form a recessed reserved opening 22, so that when the clamping arm 3 descends to the ground, the mounting member 21 abuts against the fixed frame 1 through the reserved opening 22.
[0042] In this embodiment, by providing the reserved opening 22, the second arm body 32 can be as close to the ground as possible, so that the second arm body 32 can be embedded on both sides of the base of the liquid nitrogen tank, ensuring that the clamping arm 3 can lift the liquid nitrogen tank.
[0043] As Figure 4 and Figure 5As shown, the lifting box 2 is provided with a chamber 201, and a sliding opening 202 is provided on one side of the lifting box 2 for communication with the lifting box 2. The clamping drive mechanism includes two sliding blocks 4, which are slidably arranged within the chamber 201. The end of the first arm 31, which is away from the second arm 32, is inserted into the chamber 201 through the sliding opening 202 and fixedly connected to the corresponding sliding block 4. The driving motor 41 is used to drive the two sliding blocks 4. In this embodiment, a limit bar is provided within the chamber 201, and the sliding block 4 is located between the limit bar and the bottom of the chamber 201, allowing the sliding block 4 to slide within the chamber 201.
[0044] A threaded rod 42 is rotatably provided in the box cavity 201, and the thread directions at both ends of the threaded rod 42 are opposite, and the two ends of the threaded rod 42 are respectively threaded through the two sliding blocks 4, and the threaded rod 42 is fixedly sleeved with a first gear 431. The drive motor 41 is fixedly provided in the box cavity 201, and the output shaft of the drive motor 41 is provided with a second gear 432 that meshes with the first gear 431, so that the two sliding blocks 4 can move in opposite directions.
[0045] Since the threads at both ends of the threaded rod 42 are in opposite directions, the two first arms 31 move in opposite directions at the same time under the drive of the drive motor 41, so that the second arm 32 can clamp and release the base of the liquid nitrogen tank. Under the action of the gravity of the liquid nitrogen tank itself, the protruding part of the bottom of the liquid nitrogen tank can abut against the second arm 32. At the same time, the second arm 32 is slightly inclined to the ground, so that the liquid nitrogen tank can be stably fixed between the two clamping arms 3.
[0046] like Figure 1 As shown, the tilt adjustment mechanism includes two tilt cylinders 34, each located on either side of the clamping arm 3. One end of the tilt cylinder 34 is pivotally connected to the second arm 32, and the other end is pivotally connected to the lifting box 2. Under the telescopic action of the tilt cylinder 34, the second arm 32 can rotate about one end of the first arm 31, thereby achieving tilt of the second arm 32.
[0047] like Figure 6 and Figure 7 As shown, a cavity 331 is provided in the third arm body 33, and a slide groove 332 connected to the cavity 331 is provided on the side of the third arm body 33 facing the lifting box 2. A limit cylinder 5 is fixedly provided in the cavity 331, and a limit rod 51 is provided at the driving end of the limit cylinder 5. One end of the limit rod 51 is fixedly connected to the driving end of the limit cylinder 5, and the other end passes through the slide groove 332 to the outside of the cavity 331, and the limit rod 51 is slidably connected to the slide groove 332.
[0048] Under the action of the limit cylinder 5, the limit rod 51 can be driven to press against the liquid nitrogen tank inside the clamping arm 3, preventing the liquid nitrogen tank from sliding out along the second arm body 32 when pouring liquid nitrogen, and ensuring safety when pouring liquid nitrogen.
[0049] As Figure 6 shown, support plates 6 are fixedly arranged on the opposite sides of the two third arm bodies 33 of the clamping arm 3, and a cambered surface 61 is arranged on the surface of the support plate 6 facing the lifting box 2. Under the action of the cambered surface 61, the contact area between the support plate 6 and the liquid nitrogen tank can be increased, preventing the liquid nitrogen tank from rolling inside the clamping arm 3 and sliding out of the clamping arm 3, and ensuring the safety of the device during use.
[0050] In this embodiment, a control box 7 is arranged on the outer wall of the fixed frame 1. A PLC controller is arranged inside the control box 7, and control buttons are arranged outside the control box 7. The PLC controller is electrically connected to the control buttons, the lifting oil cylinder 12, the tilting oil cylinder 34, the limit cylinder 5, and the driving motor 41 respectively for controlling the lifting oil cylinder 12, the tilting oil cylinder 34, the driving motor 41, and the limit cylinder 5.
[0051] The liquid nitrogen transfer process of the liquid nitrogen transfer device in this embodiment is as follows:
[0052] Push the fixed frame 1 to both sides of the liquid nitrogen tank, control the lifting oil cylinder 12 to extend, so that the lifting box 2 descends until the second arm body 32 moves to both sides of the base of the liquid nitrogen tank; control the driving motor 41 to rotate and make the two second arm bodies 32 clamp the base of the liquid nitrogen tank, and then control the tilting oil cylinder 34 to extend to tilt the end of the second arm body 32 away from the first arm body 31 towards the ground at a certain angle. The liquid nitrogen tank can press against the third arm body 33, so that the bottom and one side of the liquid nitrogen tank are respectively supported on the second arm body 32 and the third arm body 33. Control the limit cylinder 5 to shorten, so that the limit rod 51 presses against the liquid nitrogen tank inside the clamping arm 3, thereby realizing loading the liquid nitrogen tank onto the clamping arm 3;
[0053] Control the lifting oil cylinder 12 to extend until the liquid nitrogen tank is at an appropriate height, and control the tilting oil cylinder 34 to extend to tilt the second arm body 32, so as to pour the liquid nitrogen in the liquid nitrogen tank into the liquid nitrogen storage tank, realizing the transfer of liquid nitrogen.
Claims
1. A liquid nitrogen transfer device, characterized in that, It includes a fixed frame (1) and a lifting box (2). On both sides of the bottom of the fixed frame (1), there are support frames (11) respectively. One end of the support frame (11) is fixedly connected to the fixed frame (1), and the other end is rotatably provided with rollers (101). On one side of the bottom of the fixed frame (1) facing away from the support frame (11), there are universal wheels (102). The lifting box (2) is slidably arranged in the fixed frame (1). One side of the lifting box (2) is fixedly connected to the inner wall of the top of the fixed frame (1) through a lifting oil cylinder (12). On the other side of the lifting box (2), there are two clamping arms (3). The clamping arm (3) includes a first arm body (31), a second arm body (32) and a third arm body (33). One end of the first arm body (31) is slidably connected to the lifting box (2) through a clamping drive mechanism. The other end of the first arm body (31) is rotatably connected to one end of the second arm body (32), and the second arm body (32) is connected to the lifting box (2) through an inclination adjustment mechanism to adjust the angle between the second arm body (32) and the first arm body (31). The third arm body (33) is fixedly connected to the end of the second arm body (32) far from the first arm body (31).
2. A liquid nitrogen transfer device according to claim 1, characterized in that: The first arm body (31) and the support frame (11) are both located on one side of the fixed frame (1), and the first arm body (31) is parallel to the support frame (11). The third arm body (33) is perpendicular to the second arm body (32).
3. The nitrogen liquid transfer device according to claim 1, characterized in that: There is a box cavity (201) arranged in the lifting box (2), and on one side of the lifting box (2), there is a sliding opening (202) communicated with the lifting box (2). The clamping drive mechanism includes sliding blocks (4) and a drive motor (41). There are two sliding blocks (4), and the sliding blocks (4) are slidably arranged in the box cavity (201). One end of the first arm body (31) far from the second arm body (32) is embedded into the box cavity (201) through the sliding opening (202) and fixedly connected to the corresponding sliding block (4). The drive motor (41) is used to drive the two sliding blocks (4).
4. The nitrogen liquid transfer device according to claim 3, wherein: A threaded rod (42) is rotatably arranged in the box cavity (201). The thread directions at both ends of the threaded rod (42) are opposite, and both ends of the threaded rod (42) are respectively threadedly penetrated through the two sliding blocks (4). The threaded rod (42) is fixedly sleeved with a first gear (431). The drive motor (41) is fixedly arranged in the box cavity (201), and the output shaft of the drive motor (41) is provided with a second gear (432) meshing with the first gear (431) so that the two sliding blocks (4) can move in opposite directions.
5. A liquid nitrogen transfer device according to claim 1, characterized in that: On the side of the lifting box (2) facing away from the clamping arm (3), there is a mounting part (21) fixedly arranged. The mounting part (21) is fixedly connected to the lifting oil cylinder (12). Sliding rods (121) are respectively provided on both sides of the lifting oil cylinder (12), the sliding rods (121) are located in the fixed frame (1), and the two ends of the sliding rods (121) are respectively fixedly connected to the fixed frame (1), and the sliding rods (121) are slidably inserted into the mounting member (21).
6. The nitrogen liquid transfer device according to claim 5, characterized in that: The bottom of the mounting member (21) and the bottom of the lifting box (2) form a recessed reserved opening (22), so that when the clamping arm (3) is lowered to the ground, the mounting member (21) abuts against the fixed frame (1) through the reserved opening (22).
7. The liquid nitrogen transfer device according to claim 1, characterized in that: The tilt adjustment mechanism includes a tilt oil cylinder (34), two of which are provided and are located on both sides of the clamping arm (3), one end of the tilt oil cylinder (34) is rotatably connected to the second arm body (32), and the other end is rotatably connected to the lifting box (2).
8. A liquid nitrogen transfer device according to claim 1, characterized in that: A cavity (331) is provided in the third arm body (33), and a slide groove (332) communicating with the cavity (331) is provided on the side of the third arm body (33) facing the lifting box (2). A limit cylinder (5) is fixedly provided in the cavity (331), and a limit rod (51) is provided at the driving end of the limit cylinder (5). One end of the limit rod (51) is fixedly connected to the driving end of the limit cylinder (5), and the other end passes through the slide groove (332) to the outside of the cavity (331), and the limit rod (51) is slidably connected to the slide groove (332).
9. A liquid nitrogen transfer device according to claim 1, characterized in that: A supporting plate (6) is fixedly provided on one side opposite to the two third arm bodies (33) of the clamping arm (3), and a curved surface (61) is provided on one side of the supporting plate (6) facing the lifting box (2).