Liquid nitrogen pouring device

Abstract

The utility model discloses a liquid nitrogen pouring device, which belongs to the technical field of liquid nitrogen equipment, comprises a liquid nitrogen tank, a Dewar flask and a non-return device, and is characterized by further comprising a liquid nitrogen pouring support, a liquid nitrogen tank locking mechanism, a rotating shaft, a driving piece and a controller, and the non-return device, the driving piece and the controller are fixed on the liquid nitrogen pouring support. The liquid nitrogen tank is rotationally connected to the liquid nitrogen pouring support through a rotating shaft, the driving piece is connected with the rotating shaft, a liquid nitrogen tank locking mechanism is arranged on the liquid nitrogen tank and comprises a metal bottom plate, a metal ring, an adjustable belt piece and a lock catch connected with the adjustable belt piece, the metal ring is connected with the metal bottom plate, and the adjustable belt piece is connected with the lock catch. A metal strip is fixed on the top of the metal ring, and the adjustable belt piece is fixed on the metal ring. The liquid nitrogen pouring device is suitable for liquid nitrogen containers of different specifications to pour liquid nitrogen, the liquid nitrogen pouring flow speed can be effectively adjusted, the liquid nitrogen splashing amount is reduced, and the liquid nitrogen pouring safety is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid nitrogen equipment, in particular to a liquid nitrogen pouring device. Background Art

[0002] In laboratories, liquid nitrogen is widely used. For example, when using a nitrogen adsorption instrument to test the specific surface area of ​​a sample, the sample tank needs to be placed in a Dewar flask filled with liquid nitrogen for testing. At present, when pouring liquid nitrogen, the main method is for experimenters to lift the liquid nitrogen tank and pour the liquid nitrogen into the Dewar flask. There are many risk points and inconveniences in this process. First, the liquid nitrogen tank for storing liquid nitrogen indoors is large in size and weight, and single-person operation can easily lead to limb sprains; second, in order to reduce the volatilization of liquid nitrogen, the Dewar flask has a small bottle mouth design, and two-person operation will cause the liquid nitrogen flow rate to be uneven and the stability to be poor due to the different forces used by the people on both sides when pouring, which can easily cause liquid nitrogen to spill and splash onto the operator.

[0003] There are currently two types of devices that assist in dumping liquid nitrogen. One is to add a funnel-like device to the original Dewar flask to enlarge the mouth of the Dewar flask, so as to reduce the amount of liquid nitrogen splashing when dumping. However, manpower is still required to move the liquid nitrogen tank, which is laborious and easy to get injured. The other is to install a bracket for the liquid nitrogen tank and manually rotate the mechanical arm to tilt the liquid nitrogen tank. Although this reduces some manpower, it still requires people to bend over the handle throughout the dumping process, and the liquid nitrogen flow rate needs to be manually controlled, which is easy to overflow and spill liquid nitrogen.

[0004] A Chinese patent document with publication number CN112628590A and publication date April 9, 2021 discloses a liquid nitrogen dumping device, characterized in that: it includes the frame, the driving mechanism, the rotating shaft, the liquid nitrogen tank clamp locking mechanism and the liquid nitrogen funnel; the frame is provided with a driving mechanism mounting platform and a rotating shaft support frame; the rotating shaft is mounted on the rotating shaft support frame; the driving mechanism is mounted on the driving mechanism mounting platform; the driving mechanism drives the rotating shaft to rotate; the liquid nitrogen tank clamp locking mechanism is a square shell as a whole, the lower end of which is closed, the upper end is bent inward to form a necking, and ... A closable pressing plate is arranged on one side wall of the mechanism; the upper end of the clamp locking mechanism of the liquid nitrogen tank is fixedly connected to the rotating shaft; the liquid nitrogen funnel is installed on the frame, and when the driving mechanism drives the rotating shaft to rotate, the rotating shaft drives the clamp locking mechanism of the liquid nitrogen tank to rotate, so that the constriction at the upper end of the clamp locking mechanism of the liquid nitrogen tank corresponds to the liquid nitrogen funnel; when working, the liquid nitrogen tank is loaded into the clamp locking mechanism of the liquid nitrogen tank, and the pressing plate is closed; the liquid nitrogen container cart is placed at the lower end of the liquid nitrogen funnel; the driving mechanism drives the rotating shaft to rotate, and the filling port of the liquid nitrogen tank is rotated to the position corresponding to the liquid nitrogen funnel, so that the liquid nitrogen flows into the liquid nitrogen container cart through the liquid nitrogen funnel.

[0005] The liquid nitrogen pouring device disclosed in the patent document uses a motor to drive a rotating shaft to tilt the liquid nitrogen tank. The pouring device can realize the rapid clamping of the liquid nitrogen bottle and automatically and smoothly pour the liquid nitrogen into the liquid nitrogen container. However, the size of the liquid nitrogen tank is relatively single, which is not suitable for pouring liquid nitrogen from liquid nitrogen tanks of different specifications, and the pouring liquid nitrogen flow rate cannot be controlled, so the applicability is poor. Utility Model Content

[0006] In order to overcome the defects of the prior art, the utility model provides a liquid nitrogen dumping device. The utility model is suitable for dumping liquid nitrogen from liquid nitrogen tanks of different specifications, can effectively adjust the flow rate of liquid nitrogen dumping, reduce the amount of liquid nitrogen splashing, and ensure the safety of liquid nitrogen dumping.

[0007] The utility model is realized by the following technical solutions:

[0008] A liquid nitrogen dumping device comprises a liquid nitrogen tank, a Dewar flask and a backstop, characterized in that it also comprises a liquid nitrogen dumping bracket, a liquid nitrogen tank locking mechanism, a rotating shaft, a driving member and a controller, the backstop, the driving member and the controller are fixed on the liquid nitrogen dumping bracket, the liquid nitrogen tank is rotatably connected to the liquid nitrogen dumping bracket through the rotating shaft, the driving member is connected to the rotating shaft, the liquid nitrogen tank is provided with the liquid nitrogen tank locking mechanism, the liquid nitrogen tank locking mechanism comprises a metal bottom plate, a metal ring, an adjustable belt member and a lock connected to the adjustable belt member, the metal ring is connected to the metal bottom plate, a metal strip is fixed on the top of the metal ring, the adjustable belt member is fixed on the metal ring, and the controller is used to control the driving member to drive the rotating shaft to rotate forward and reverse.

[0009] The driving component is a servo motor.

[0010] The adjustable belt member comprises a first adjustable belt, a second adjustable belt, a third adjustable belt and a fourth adjustable belt, and the second adjustable belt, the third adjustable belt and the fourth adjustable belt are evenly arranged along the circumference of the liquid nitrogen tank.

[0011] The first adjustable belt is fixed to the top of the liquid nitrogen tank.

[0012] The bottom of the Dewar flask is provided with a fixed base.

[0013] The fixed base is slidably connected to the lower part of the liquid nitrogen pouring support.

[0014] A liquid nitrogen funnel is arranged on the top of the Dewar flask.

[0015] A suspension line is connected inside the liquid nitrogen funnel, and a liquid level float is connected to the suspension line. The liquid level float is a small foam ball, and the liquid level float is located in the middle of the liquid nitrogen funnel.

[0016] A sponge block is bonded to the inner wall of the metal ring.

[0017] The beneficial effects of the utility model are mainly manifested in the following aspects:

[0018] 1. In the utility model, a backstop, a driving member and a controller are fixed on a liquid nitrogen dumping bracket, a liquid nitrogen tank is rotatably connected to the liquid nitrogen dumping bracket through a rotating shaft, a driving member is connected to the rotating shaft, a liquid nitrogen tank locking mechanism is provided on the liquid nitrogen tank, and the liquid nitrogen tank locking mechanism comprises a metal bottom plate, a metal ring, an adjustable belt member and a lock connected to the adjustable belt member, the metal ring is connected to the metal bottom plate, a metal strip is fixed on the top of the metal ring, the adjustable belt member is fixed on the metal ring, and a controller is used to control the driving member to drive the rotating shaft to rotate forward and reversely. Compared with the prior art, the length of the belt is adjusted by the adjustable belt member, which is suitable for dumping liquid nitrogen from liquid nitrogen tanks of different specifications, can effectively adjust the flow rate of dumping liquid nitrogen, reduce the amount of liquid nitrogen splashing, and ensure the safety of liquid nitrogen dumping.

[0019] 2. In the utility model, the adjustable belt member comprises a first adjustable belt, a second adjustable belt, a third adjustable belt and a fourth adjustable belt. The second adjustable belt, the third adjustable belt and the fourth adjustable belt are evenly arranged along the circumference of the liquid nitrogen tank, have a good fixing effect, are easy to adjust, have a simple structure and a low manufacturing cost.

[0020] 3. In the utility model, the controller can control the rotation direction and speed of the driving member, thereby controlling the flow rate of liquid nitrogen and reducing the amount of liquid nitrogen splashing.

[0021] 4. In the utility model, a suspension line is connected inside the liquid nitrogen funnel, and a liquid level float is connected to the suspension line. The liquid level float is a small foam ball, and the liquid level float is located in the middle of the liquid nitrogen funnel. In the process of pouring liquid nitrogen, a large amount of liquid nitrogen is gasified to form white mist, and it is difficult to see the liquid level of the liquid nitrogen in the Dewar flask with the naked eye. The liquid level float is connected to the suspension line, and whether the liquid level reaches the appropriate height can be judged by whether the suspension line is in a straightened state, which is more convenient and intuitive.

[0022] 5. In the utility model, when the liquid nitrogen level reaches the appropriate height of the Dewar flask, the liquid nitrogen tank is reversed, and after the locking mechanism of the liquid nitrogen tank is returned to the normal position, the metal strip touches the check valve, the driving part is powered off, and the liquid nitrogen tank stops rotating, which can prevent the liquid nitrogen from spilling due to excessive reversal and affecting the rotating shaft and the driving part. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementations, wherein:

[0024] Figure 1 It is a schematic diagram of the structure of the utility model;

[0025] Figure 2 It is a side view of the utility model;

[0026] Figure 3 It is a top view of the utility model;

[0027] Markings in the figure: 1. Liquid nitrogen tank, 2. Dewar flask, 3. Backstop, 4. Liquid nitrogen dumping bracket, 5. Liquid nitrogen tank locking mechanism, 6. Rotating shaft, 7. Driving part, 8. Controller, 9. Metal base plate, 10. Metal ring, 11. Adjustable belt part, 12. Lock, 13. Metal strip, 14. First adjustable belt, 15. Second adjustable belt, 16. Third adjustable belt, 17. Fourth adjustable belt, 18. Fixed base, 19. Liquid nitrogen funnel, 20. Suspension line, 21. Liquid level float, 22. Sponge block. DETAILED DESCRIPTION

[0028] Example 1

[0029] See also Figure 1-Figure 3 A liquid nitrogen dumping device comprises a liquid nitrogen tank 1, a Dewar flask 2 and a backstop 3, and also comprises a liquid nitrogen dumping bracket 4, a liquid nitrogen tank locking mechanism 5, a rotating shaft 6, a driving member 7 and a controller 8, wherein the backstop 3, the driving member 7 and the controller 8 are fixed on the liquid nitrogen dumping bracket 4, the liquid nitrogen tank 1 is rotatably connected to the liquid nitrogen dumping bracket 4 through the rotating shaft 6, the driving member 7 is connected to the rotating shaft 6, the liquid nitrogen tank 1 is provided with the liquid nitrogen tank locking mechanism 5, the liquid nitrogen tank locking mechanism 5 comprises a metal bottom plate 9, a metal ring 10, an adjustable belt member 11 and a lock buckle 12 connected to the adjustable belt member 11, the metal ring 10 is connected to the metal bottom plate 9, a metal strip 13 is fixed on the top of the metal ring 10, the adjustable belt member 11 is fixed on the metal ring 10, and the controller 8 is used to control the driving member 7 to drive the rotating shaft 6 to rotate forward and reverse.

[0030] This embodiment is the most basic implementation method. The check valve 3, the driving member 7 and the controller 8 are fixed on the liquid nitrogen dumping bracket 4. The liquid nitrogen tank 1 is rotatably connected to the liquid nitrogen dumping bracket 4 through the rotating shaft 6. The driving member 7 is connected to the rotating shaft 6. The liquid nitrogen tank 1 is provided with a liquid nitrogen tank locking mechanism 5. The liquid nitrogen tank locking mechanism 5 includes a metal base plate 9, a metal ring 10, an adjustable belt member 11 and a lock buckle 12 connected to the adjustable belt member 11. The metal ring 10 is connected to the metal base plate 9. A metal strip 13 is fixed on the top of the metal ring 10. The adjustable belt member 11 is fixed on the metal ring 10. The controller 8 is used to control the driving member 7 to drive the rotating shaft 6 to rotate forward and reverse. Compared with the prior art, the length of the belt is adjusted by the adjustable belt member 11. It is suitable for liquid nitrogen tanks 1 of different specifications to dump liquid nitrogen, and can effectively adjust the flow rate of liquid nitrogen dumping, reduce the amount of liquid nitrogen splashing, and ensure the safety of liquid nitrogen dumping.

[0031] Example 2

[0032] See also Figure 1-Figure 3A liquid nitrogen dumping device comprises a liquid nitrogen tank 1, a Dewar flask 2 and a backstop 3, and also comprises a liquid nitrogen dumping bracket 4, a liquid nitrogen tank locking mechanism 5, a rotating shaft 6, a driving member 7 and a controller 8, wherein the backstop 3, the driving member 7 and the controller 8 are fixed on the liquid nitrogen dumping bracket 4, the liquid nitrogen tank 1 is rotatably connected to the liquid nitrogen dumping bracket 4 through the rotating shaft 6, the driving member 7 is connected to the rotating shaft 6, the liquid nitrogen tank 1 is provided with the liquid nitrogen tank locking mechanism 5, the liquid nitrogen tank locking mechanism 5 comprises a metal bottom plate 9, a metal ring 10, an adjustable belt member 11 and a lock buckle 12 connected to the adjustable belt member 11, the metal ring 10 is connected to the metal bottom plate 9, a metal strip 13 is fixed on the top of the metal ring 10, the adjustable belt member 11 is fixed on the metal ring 10, and the controller 8 is used to control the driving member 7 to drive the rotating shaft 6 to rotate forward and reverse.

[0033] The driving member 7 is a servo motor.

[0034] The adjustable belt member 11 includes a first adjustable belt 14 , a second adjustable belt 15 , a third adjustable belt 16 and a fourth adjustable belt 17 , and the second adjustable belt 15 , the third adjustable belt 16 and the fourth adjustable belt 17 are evenly arranged along the circumference of the liquid nitrogen tank 1 .

[0035] This embodiment is a preferred implementation mode. The adjustable belt member 11 includes a first adjustable belt 14, a second adjustable belt 15, a third adjustable belt 16 and a fourth adjustable belt 17. The second adjustable belt 15, the third adjustable belt 16 and the fourth adjustable belt 17 are evenly arranged along the circumference of the liquid nitrogen tank 1, have a good fixing effect, are easy to adjust, have a simple structure and a low manufacturing cost.

[0036] Example 3

[0037] See also Figure 1-Figure 3 A liquid nitrogen dumping device comprises a liquid nitrogen tank 1, a Dewar flask 2 and a backstop 3, and also comprises a liquid nitrogen dumping bracket 4, a liquid nitrogen tank locking mechanism 5, a rotating shaft 6, a driving member 7 and a controller 8, wherein the backstop 3, the driving member 7 and the controller 8 are fixed on the liquid nitrogen dumping bracket 4, the liquid nitrogen tank 1 is rotatably connected to the liquid nitrogen dumping bracket 4 through the rotating shaft 6, the driving member 7 is connected to the rotating shaft 6, the liquid nitrogen tank 1 is provided with the liquid nitrogen tank locking mechanism 5, the liquid nitrogen tank locking mechanism 5 comprises a metal bottom plate 9, a metal ring 10, an adjustable belt member 11 and a lock buckle 12 connected to the adjustable belt member 11, the metal ring 10 is connected to the metal bottom plate 9, a metal strip 13 is fixed on the top of the metal ring 10, the adjustable belt member 11 is fixed on the metal ring 10, and the controller 8 is used to control the driving member 7 to drive the rotating shaft 6 to rotate forward and reverse.

[0038] The driving member 7 is a servo motor.

[0039] Furthermore, the adjustable belt member 11 includes a first adjustable belt 14 , a second adjustable belt 15 , a third adjustable belt 16 and a fourth adjustable belt 17 , and the second adjustable belt 15 , the third adjustable belt 16 and the fourth adjustable belt 17 are evenly arranged along the circumference of the liquid nitrogen tank 1 .

[0040] The first adjustable belt 14 is fixed on the top of the liquid nitrogen tank 1 .

[0041] A fixed base 18 is provided at the bottom of the Dewar flask 2 .

[0042] The fixed base 18 is slidably connected to the lower part of the liquid nitrogen pouring bracket 4 .

[0043] This embodiment is another preferred implementation mode. The controller 8 can control the rotation direction and speed of the driving member 7, thereby controlling the flow rate of liquid nitrogen and reducing the amount of liquid nitrogen splashing.

[0044] Example 4

[0045] See also Figure 1-Figure 3 A liquid nitrogen dumping device comprises a liquid nitrogen tank 1, a Dewar flask 2 and a backstop 3, and also comprises a liquid nitrogen dumping bracket 4, a liquid nitrogen tank locking mechanism 5, a rotating shaft 6, a driving member 7 and a controller 8, wherein the backstop 3, the driving member 7 and the controller 8 are fixed on the liquid nitrogen dumping bracket 4, the liquid nitrogen tank 1 is rotatably connected to the liquid nitrogen dumping bracket 4 through the rotating shaft 6, the driving member 7 is connected to the rotating shaft 6, the liquid nitrogen tank 1 is provided with the liquid nitrogen tank locking mechanism 5, the liquid nitrogen tank locking mechanism 5 comprises a metal bottom plate 9, a metal ring 10, an adjustable belt member 11 and a lock buckle 12 connected to the adjustable belt member 11, the metal ring 10 is connected to the metal bottom plate 9, a metal strip 13 is fixed on the top of the metal ring 10, the adjustable belt member 11 is fixed on the metal ring 10, and the controller 8 is used to control the driving member 7 to drive the rotating shaft 6 to rotate forward and reverse.

[0046] The driving member 7 is a servo motor.

[0047] The adjustable belt member 11 includes a first adjustable belt 14 , a second adjustable belt 15 , a third adjustable belt 16 and a fourth adjustable belt 17 , and the second adjustable belt 15 , the third adjustable belt 16 and the fourth adjustable belt 17 are evenly arranged along the circumference of the liquid nitrogen tank 1 .

[0048] The first adjustable belt 14 is fixed on the top of the liquid nitrogen tank 1 .

[0049] A fixed base 18 is provided at the bottom of the Dewar flask 2 .

[0050] The fixed base 18 is slidably connected to the lower part of the liquid nitrogen pouring bracket 4 .

[0051] A liquid nitrogen funnel 19 is provided on the top of the Dewar flask 2 .

[0052] This embodiment is another preferred implementation manner. A suspension line 20 is connected inside the liquid nitrogen funnel 19. A liquid level float 21 is connected to the suspension line 20. The liquid level float 21 is a small foam ball. The liquid level float 21 is located in the middle of the liquid nitrogen funnel 19. During the pouring of liquid nitrogen, a large amount of liquid nitrogen is vaporized to form white mist. It is difficult to see the liquid level of the liquid nitrogen in the Dewar flask 2 with the naked eye. The liquid level float 21 is connected to the suspension line 20. By judging whether the suspension line 20 is in a straightened state, it is possible to judge whether the liquid level has reached a suitable height, which is more convenient and intuitive.

[0053] Example 5

[0054] See also Figure 1-Figure 3 A liquid nitrogen dumping device comprises a liquid nitrogen tank 1, a Dewar flask 2 and a backstop 3, and also comprises a liquid nitrogen dumping bracket 4, a liquid nitrogen tank locking mechanism 5, a rotating shaft 6, a driving member 7 and a controller 8, wherein the backstop 3, the driving member 7 and the controller 8 are fixed on the liquid nitrogen dumping bracket 4, the liquid nitrogen tank 1 is rotatably connected to the liquid nitrogen dumping bracket 4 through the rotating shaft 6, the driving member 7 is connected to the rotating shaft 6, the liquid nitrogen tank 1 is provided with the liquid nitrogen tank locking mechanism 5, the liquid nitrogen tank locking mechanism 5 comprises a metal bottom plate 9, a metal ring 10, an adjustable belt member 11 and a lock buckle 12 connected to the adjustable belt member 11, the metal ring 10 is connected to the metal bottom plate 9, a metal strip 13 is fixed on the top of the metal ring 10, the adjustable belt member 11 is fixed on the metal ring 10, and the controller 8 is used to control the driving member 7 to drive the rotating shaft 6 to rotate forward and reverse.

[0055] The driving member 7 is a servo motor.

[0056] The adjustable belt member 11 includes a first adjustable belt 14 , a second adjustable belt 15 , a third adjustable belt 16 and a fourth adjustable belt 17 , and the second adjustable belt 15 , the third adjustable belt 16 and the fourth adjustable belt 17 are evenly arranged along the circumference of the liquid nitrogen tank 1 .

[0057] The first adjustable belt 14 is fixed on the top of the liquid nitrogen tank 1 .

[0058] A fixed base 18 is provided at the bottom of the Dewar flask 2 .

[0059] The fixed base 18 is slidably connected to the lower part of the liquid nitrogen pouring bracket 4 .

[0060] A liquid nitrogen funnel 19 is provided on the top of the Dewar flask 2 .

[0061] The liquid nitrogen funnel 19 is connected with a suspension line 20 , and the suspension line 20 is connected with a liquid level float 21 . The liquid level float 21 is a foam ball, and the liquid level float 21 is located in the middle of the liquid nitrogen funnel 19 .

[0062] A sponge block 22 is bonded to the inner wall of the metal ring 10 .

[0063] This embodiment is the best implementation mode. When the liquid nitrogen level reaches the appropriate height of the Dewar flask 2, the liquid nitrogen tank 1 is reversed. After the liquid nitrogen tank locking mechanism 5 is returned to the normal position, the metal strip 13 touches the check valve 3, the driving member 7 is powered off, and the liquid nitrogen tank 1 stops rotating, which can prevent the liquid nitrogen from spilling due to excessive reversal and affecting the rotating shaft 6 and the driving member 7.

[0064] The working process of the utility model is as follows:

[0065] S1, put the liquid nitrogen tank 1 into the liquid nitrogen tank locking mechanism 5, adjust the adjustable belt member 11 to be in close contact with the liquid nitrogen tank 1, and then fasten the lock buckle 12;

[0066] S2, placing the Dewar flask 2 on the fixed base 18, and placing the liquid level float 21 into the Dewar flask 2;

[0067] S3, turn on the power of the equipment, control the driving member 7 through the controller 8 to drive the rotating shaft 6 to rotate forward, so that the liquid nitrogen in the liquid nitrogen tank 1 is poured into the liquid nitrogen funnel 19 of the Dewar flask 2, and flows into the Dewar flask 2 through the liquid nitrogen funnel 19;

[0068] S4, when the suspension line 20 of the suspension liquid level float 21 is no longer straightened, indicating that the liquid level has reached a suitable position, the operator reverses the driving member 7 through the controller 8;

[0069] S5, after the liquid nitrogen tank 1 is straightened, the metal strip 13 at the rear side of the liquid nitrogen tank 1 touches the check valve 3, and the driving member 7 stops working, thus completing the liquid nitrogen dumping work.

Claims

1. A liquid nitrogen pouring device, comprising a liquid nitrogen tank (1), a Dewar flask (2) and a backstop (3), characterized in that: The invention also comprises a liquid nitrogen dumping bracket (4), a liquid nitrogen tank locking mechanism (5), a rotating shaft (6), a driving member (7) and a controller (8), wherein the check valve (3), the driving member (7) and the controller (8) are fixed on the liquid nitrogen dumping bracket (4), the liquid nitrogen tank (1) is rotatably connected to the liquid nitrogen dumping bracket (4) via the rotating shaft (6), the driving member (7) is connected to the rotating shaft (6), the liquid nitrogen tank locking mechanism (5) is arranged on the liquid nitrogen tank (1), the liquid nitrogen tank locking mechanism (5) comprises a metal bottom plate (9), a metal ring (10), an adjustable belt member (11) and a lock buckle (12) connected to the adjustable belt member (11), the metal ring (10) is connected to the metal bottom plate (9), a metal strip (13) is fixed on the top of the metal ring (10), the adjustable belt member (11) is fixed on the metal ring (10), and the controller (8) is used to control the driving member (7) to drive the rotating shaft (6) to rotate forward and reverse.

2. A liquid nitrogen pouring device according to claim 1, characterized in that: The driving member (7) is a servo motor.

3. A liquid nitrogen pouring device according to claim 1, characterized in that: The adjustable belt member (11) comprises a first adjustable belt (14), a second adjustable belt (15), a third adjustable belt (16) and a fourth adjustable belt (17); the second adjustable belt (15), the third adjustable belt (16) and the fourth adjustable belt (17) are evenly arranged along the circumference of the liquid nitrogen tank (1).

4. A liquid nitrogen pouring device according to claim 3, characterized in that: The first adjustable belt (14) is fixed on the top of the liquid nitrogen tank (1).

5. A liquid nitrogen pouring device according to claim 1, characterized in that: A fixed base (18) is provided at the bottom of the Dewar flask (2).

6. A liquid nitrogen pouring device according to claim 5, characterized in that: The fixed base (18) is slidably connected to the lower part of the liquid nitrogen pouring bracket (4).

7. A liquid nitrogen pouring device according to claim 1, characterized in that: A liquid nitrogen funnel (19) is provided on the top of the Dewar flask (2).

8. A liquid nitrogen pouring device according to claim 7, characterized in that: The liquid nitrogen funnel (19) is connected with a suspension line (20), and a liquid level float (21) is connected to the suspension line (20). The liquid level float (21) is a small foam ball, and the liquid level float (21) is located in the middle of the liquid nitrogen funnel (19).

9. A liquid nitrogen pouring device according to claim 1, characterized in that: A sponge block (22) is bonded to the inner wall of the metal ring (10).

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