Liquid nitrogen filling auxiliary device

Abstract

The utility model is suitable for the technical field of liquid nitrogen filling, and provides a liquid nitrogen filling auxiliary device which comprises a lifting type base plate, and a driving frame is arranged on the base plate. The driving block is arranged on the driving frame; the lifting frame is fixed at the bottom end of the driving block; the winding roller is rotationally mounted on the hoisting frame; and the steel wire rope is arranged on the winding roller, and a limiting hook used for hooking and fixing the liquid nitrogen filling pipe is fixedly installed at the bottom end of the steel wire rope. According to the liquid nitrogen filling auxiliary device provided by the scheme, through reasonable structural design and function configuration, the problems of inconvenience in operation and safety risk caused by too high position of the neck opening of the gas-phase liquid nitrogen tank are effectively solved, and the working efficiency and the operation safety of laboratory personnel are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquid nitrogen filling, and in particular relates to a liquid nitrogen filling auxiliary device. Background Art

[0002] In the fields of biomedicine, cell biology and genetic engineering, liquid nitrogen is widely used for cell cryopreservation; gas phase liquid nitrogen tanks are commonly used storage equipment in these laboratories to maintain a low temperature environment for a long time to ensure the activity and integrity of cell samples.

[0003] However, since the neck design of current gas phase liquid nitrogen tanks is usually relatively high, generally more than 1.5 meters, this brings many inconveniences to laboratory personnel when performing sample extraction or liquid nitrogen filling. Utility Model Content

[0004] The utility model provides a liquid nitrogen filling auxiliary device, aiming to solve the problem that the neck of the gas phase liquid nitrogen tank is too high and the liquid nitrogen filling is inconvenient.

[0005] The utility model is implemented as follows: a liquid nitrogen filling auxiliary device comprises: a lifting base plate, a driving frame is arranged on the base plate; a driving block, the driving block is arranged on the driving frame; a lifting frame, the lifting frame is fixed to the bottom end of the driving block; a winding roller, the winding roller is rotatably mounted on the lifting frame; a steel wire rope, the steel wire rope is arranged on the winding roller, and a limiting hook for hooking and fixing a liquid nitrogen filling pipe is fixedly installed on the bottom end of the steel wire rope; a first motor for driving the winding roller to rotate, the output shaft of the first motor is fixedly connected to one end of the shaft of the winding roller; a driving mechanism for driving and regulating the lateral movement of the driving block, the driving mechanism being arranged on the driving frame.

[0006] Preferably, the driving mechanism includes: a screw rotatably mounted on the driving frame, one end of the screw passing through the driving block; a guide rod fixed on the driving frame for limiting and guiding the driving block, the guide rod passing through the driving block; a second motor fixed on one side of the driving frame for driving the screw to rotate; a coupling mounted on the output shaft of the second motor, one end of the coupling being fixedly connected to one end of the screw.

[0007] Preferably, an assembly box is fixedly installed on the top of the base plate, an electric hydraulic rod for regulating the lifting of the driving frame is fixedly installed in the assembly box, and the top end of the output rod of the electric hydraulic rod is fixedly connected to the driving frame.

[0008] Preferably, a connecting frame is fixedly installed on one side of the base plate, a plurality of supporting columns are symmetrically fixedly installed on the bottom of the connecting frame and the bottom of the base plate, and a brake-type universal wheel is fixedly installed on the bottom ends of the plurality of supporting columns.

[0009] Preferably, the limit hook is provided with an anti-slip bump, and the limit hook is provided with a press-type spring piece for clamping the liquid nitrogen filling pipe.

[0010] Preferably, a through opening is provided on the top of the assembly box, the inner diameter of the through opening is larger than the output rod of the electric hydraulic rod, an inspection port is provided on one side of the assembly box, a detachable baffle is provided in the inspection port, a screw for limiting is provided on the baffle, and the screw is threadedly connected to the assembly box.

[0011] Preferably, the connecting frame is U-shaped, and the inner diameter of the connecting frame is larger than the gas phase liquid nitrogen tank.

[0012] Compared with the related art, the liquid nitrogen filling auxiliary device provided by the utility model has the following beneficial effects:

[0013] Through the design of the lifting base plate, the device can adjust the overall height as needed to compensate for the problem of the neck position of the gas phase liquid nitrogen tank being too high, thereby reducing the operating burden and improving work efficiency; secondly, the combination of the drive block and the drive mechanism makes the lifting and lateral movement of the winding roller and the liquid nitrogen filling pipe precisely controllable, enhancing the flexibility and convenience of operation; this design not only adapts to the operating requirements of different positions, but also reduces the risk of operating at heights; in addition, the combined use of the assembly box and the electric hydraulic rod provides a stable lifting function for the drive frame, further enhancing the stability and reliability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the main structure of a liquid nitrogen filling auxiliary device provided by the utility model;

[0015] Figure 2 This is a schematic diagram of the main cross-sectional structure of the utility model;

[0016] Figure 3 for Figure 2 An enlarged structural diagram of part A shown in FIG.

[0017] Figure 4 It is an assembly diagram of the base plate and the connecting frame in the utility model.

[0018] Figure numerals: 1. base plate 1; 2. drive frame; 3. drive block; 4. lifting frame; 5. winding roller; 6. wire rope; 7. limit hook; 8. first motor; 9. screw; 10. guide rod; 11. second motor; 12. coupling; 13. assembly box; 14. electric hydraulic rod; 15. connecting frame; 16. support column; 17. universal wheel. DETAILED DESCRIPTION

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0020] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0021] The utility model embodiment provides a liquid nitrogen filling auxiliary device, such as Figure 1-4 As shown, the liquid nitrogen filling auxiliary device includes: a lifting base plate 1, on which a driving frame 2 is arranged; a driving block 3, which is arranged on the driving frame 2; a lifting frame 4, which is fixed on the bottom end of the driving block 3; a winding roller 5, which is rotatably mounted on the lifting frame 4; a wire rope 6, which is arranged on the winding roller 5, and a limiting hook 7 for hooking and fixing the liquid nitrogen filling pipe is fixedly installed on the bottom end of the wire rope 6; a first motor 8 for driving the winding roller 5 to rotate, and the output shaft of the first motor 8 is fixedly connected to one end of the shaft of the winding roller 5; a driving mechanism for driving and regulating the lateral movement of the driving block 3, and the driving mechanism is arranged on the driving frame 2.

[0022] It should be noted, however, that we must face up to a realistic problem, that is, the neck design of the widely used gas phase liquid nitrogen tank is usually set at a higher position, generally at a height of more than 1.5 meters; this design feature brings many operational inconveniences to laboratory personnel in actual applications; first of all, for laboratory personnel, it is a very laborious and inefficient task to extract samples or add liquid nitrogen at a higher position for a long time. Due to the high position of the neck, laboratory personnel have to bend over or tiptoe frequently. Such an operating posture is not only easy to cause physical fatigue, but also may increase the pain or injury of the waist, back or neck caused by maintaining an unnatural posture for a long time; secondly, operating at high altitudes also increases the risk of operating errors; when laboratory personnel are adding liquid nitrogen or extracting samples, they need to look up, and the distance between their sight and the operating point is far, which may lead to inaccurate grasp of details and easy misoperation. In addition, the low temperature characteristics of liquid nitrogen also increase the difficulty of operation. Once an operation error occurs, the possibility of liquid nitrogen splashing increases, which may not only pollute the experimental environment, but also pose a threat to the safety of laboratory personnel. Furthermore, the high neck of the liquid nitrogen tank also poses a challenge to the daily cleaning and maintenance of the laboratory. Laboratory personnel need to climb or use ladders to clean or repair, which not only increases the complexity of operation, but also increases safety risks. In summary, the problem of the neck of the gas phase liquid nitrogen tank being designed too high not only affects the work efficiency of laboratory personnel, but also increases the difficulty of operation and safety risks. Therefore, in response to this problem, it is particularly important to develop a liquid nitrogen filling auxiliary device that can compensate for the height difference and improve the convenience and safety of operation.

[0023] In this embodiment, the lifting base plate 1: This is the basic part of the whole device, which has the lifting function and can adjust the height of the whole device as needed. This design is intended to make up for the problem that the neck of the gas phase liquid nitrogen tank is too high, so that laboratory personnel do not need to bend or tiptoe frequently, thereby reducing the operating burden and improving work efficiency; drive frame 2: It is set on the base plate 1, used to support and fix other components to ensure the stability and reliability of the whole device; drive block 3: It is installed on the drive frame 2, and the lateral movement function can be achieved through the regulation of the drive mechanism. This function enables the device to flexibly adjust the position of the liquid nitrogen filling tube, which is convenient for laboratory personnel to extract samples or fill liquid nitrogen; the lifting frame 4 is fixed at the bottom end of the driving block 3, and is used to support and install components such as the winding roller 5. The design of the lifting frame takes into account the load-bearing and stability to ensure that there will be no shaking or tilting during the lifting process; winding roller 5 and wire rope 6: The winding roller 5 is driven to rotate by the first motor 8, thereby driving the winding and releasing of the wire rope 6. The bottom end of the wire rope 6 is fixed with a limit hook 7, which is used to hook and fix the liquid nitrogen filling tube. This design allows laboratory personnel to remotely control the lifting and lowering of the liquid nitrogen filling tube, reducing the risk and difficulty of high-altitude operations; the limit hook 7 is used to hook and fix the liquid nitrogen filling tube to ensure that the liquid nitrogen filling tube will not fall off or shake during the lifting process. The design of the limit hook 7 takes into account the anti-slip and load-bearing capacity to ensure the safety and stability of the operation; the first motor 8 is used to drive the winding roller 5 to rotate to realize the retracting and releasing function of the wire rope 6. By controlling the speed and direction of the motor, the lifting speed and position of the liquid nitrogen filling tube can be accurately controlled; it is used to drive the lateral movement of the regulating drive block 3. Through the precise control of the driving mechanism, the liquid nitrogen filling tube can be flexibly moved in the horizontal direction to meet the operation requirements of different positions; through the design of the lifting base plate 1 and the lifting frame, laboratory personnel do not need to bend or tiptoe frequently, which reduces the difficulty and fatigue of operation, thereby improving work efficiency; by remotely controlling the lifting and movement of the liquid nitrogen filling tube, the risk of high-altitude operations is reduced. At the same time, the design of the limit hook 7 ensures the stability and safety of the liquid nitrogen filling tube during the lifting process, and prevents safety problems such as liquid nitrogen splashing caused by misoperation; the design of the drive block 3 and the drive mechanism allows the liquid nitrogen filling tube to move flexibly in the horizontal direction to meet the operation requirements of different positions. This design improves the flexibility and applicability of the device, allowing laboratory personnel to complete operations such as sample extraction and liquid nitrogen filling more conveniently.

[0024] In a further preferred embodiment of the utility model, the driving mechanism includes: a screw 9 rotatably mounted on the driving frame 2, one end of the screw 9 passes through the driving block 3; a guide rod 10 fixed on the driving frame 2 for limiting and guiding the driving block 3, the guide rod 10 passes through the driving block 3; a second motor 11 fixed on one side of the driving frame 2 for driving the screw 9 to rotate; a coupling 12 assembled on the output shaft of the second motor 11, one end of the coupling 12 is fixedly connected to one end of the screw 9.

[0025] In this embodiment, the screw 9 is rotatably mounted on the drive frame 2. Its main function is that, through its thread matching with the thread in the drive block 3, when the screw 9 rotates, the drive block 3 can be lifted and lowered along the axial direction of the screw 9. This design makes the lifting and lowering movement of the winding roller 5 more precise and stable; the guide rod 10 is fixed on the drive frame 2, and is used to limit and guide the drive block 3. The guide rod 10 runs through the drive block 3 to ensure that the drive block 3 will not deviate from the predetermined path during the lifting process, thereby enhancing the stability and reliability of the structure; the second motor 11 is fixed on one side of the drive frame 2, and is used to drive the screw 9 to rotate. By controlling the rotation direction and speed of the second motor 11, the lifting and lowering movement of the drive block 3 can be accurately controlled, thereby conveniently adjusting the height of the winding roller 5; the coupling 12 is assembled on the output shaft of the second motor 11, and one end of the coupling 12 is fixedly connected to one end of the screw 9. The function of the coupling 12 is to connect the second motor 11 and the screw 9, ensuring that the power output by the motor can be effectively transmitted to the screw 9 to realize the rotation of the screw 9. Through the threaded cooperation between the screw 9 and the driving block 3, and the precise control of the second motor 11, the lifting and lowering movement of the winding roller 5 can be precisely adjusted. This design enables firefighters to quickly and accurately adjust the height of the winding roller 5 as needed, improving the convenience and efficiency of operation; the use of the guide rod 10 ensures the stability of the driving block 3 during the lifting process, preventing operational errors or safety hazards caused by offset or shaking. This design improves the structural stability and reliability of the entire device; the coupling 12 effectively connects the second motor 11 and the screw 9, ensuring that the power output by the motor can be efficiently transmitted to the screw 9, realizing rapid and smooth transmission of power, and improving the working efficiency of the entire drive mechanism.

[0026] In a further preferred embodiment of the utility model, an assembly box 13 is fixedly installed on the top of the base plate 1, and an electric hydraulic rod 14 for regulating the lifting and lowering of the drive frame 2 is fixedly installed in the assembly box 13, and the top of the output rod of the electric hydraulic rod 14 is fixedly connected to the drive frame 2.

[0027] In this embodiment, the assembly box 13 is fixedly mounted on the top of the base plate 1. It serves as a closed space for accommodating and protecting the internal electric hydraulic rod 14 to prevent it from being disturbed and damaged by the external environment. The electric hydraulic rod 14 is fixedly mounted in the assembly box 13. It is a device that can achieve telescopic movement through electric drive. In the utility model, the top of the output rod of the electric hydraulic rod 14 is fixedly connected to the drive frame 2, so when the electric hydraulic rod 14 is extended, it can drive the drive frame 2 to move up and down; through the telescopic movement of the electric hydraulic rod 14, the lifting and lowering of the drive frame 2 can be easily adjusted, thereby realizing the lifting and lowering adjustment of the winding roller 5. This design enables firefighters to quickly and accurately adjust the height of the winding roller 5 according to actual needs, thereby improving the convenience of operation; the design of the assembly box 13 makes the entire lifting and adjusting mechanism compact and occupies a small space. At the same time, the protective effect of the assembly box 13 on the electric hydraulic rod 14 also enhances the stability and reliability of the entire device.

[0028] In a further preferred embodiment of the utility model, a connecting frame 15 is fixedly installed on one side of the base plate 1, and a plurality of supporting columns 16 are symmetrically fixedly installed on the bottom of the connecting frame 15 and the bottom of the base plate 1, and a brake-type universal wheel 17 is fixedly installed on the bottom end of the plurality of supporting columns 16.

[0029] In this embodiment, the connecting frame 15 is fixedly mounted on one side of the base plate 1; its main function is to increase the stability and structural strength of the entire device, ensuring that the base plate 1 will not shake or tilt during movement or use; the support column 16 is symmetrically fixedly mounted on the bottom of the connecting frame 15 and the bottom of the base plate 1. These support columns 16, as the main load-bearing and supporting components, can disperse the gravity of the device and ensure that the entire device is stable and reliable when placed; the brake-type universal wheel 17 is fixedly mounted on the bottom of the support column 16. This wheel has a universal rotation function, which allows the device to easily change direction, making it convenient for firefighters to move the device in different scenarios; at the same time, the brake function allows the device to be stably parked at a designated position when needed to prevent sliding or moving; through the coordinated use of the connecting frame 15 and the support column 16, the stability of the entire device is significantly improved; this design makes it difficult for the device to shake or tilt during placement or use, improving the safety and reliability of use; the use of the brake-type universal wheel 17 allows the device to be easily moved and turned; firefighters can easily push the device to the required position, improving the convenience and flexibility of operation.

[0030] In a further preferred embodiment of the present invention, the limit hook 7 is provided with an anti-slip bump, and the limit hook 7 is provided with a press-type spring piece for clamping the liquid nitrogen filling pipe.

[0031] In this embodiment, anti-skid bumps are arranged on the limit hook 7, and the design of these bumps is to increase the friction between the limit hook 7 and the liquid nitrogen filling tube, so as to prevent the filling tube from accidentally slipping or loosening during the clamping process. By increasing the roughness of the contact surface, the anti-skid bumps effectively improve the stability and reliability of the clamping; the limit hook 7 is also provided with a press-type spring for clamping the liquid nitrogen filling tube; this spring maintains a certain open state when not pressed, and when the liquid nitrogen filling tube is placed in the limit hook 7, the firefighter can press the spring to close it, so as to tightly clamp the filling tube; when the filling tube needs to be released, it can be easily removed by pressing the spring again; through the design of the anti-skid bumps, the limit hook 7 can provide more stable support when clamping the liquid nitrogen filling tube, reducing operational errors or safety hazards caused by sliding or loosening; the use of the press-type spring makes the operation of clamping and releasing the liquid nitrogen filling tube simple and quick; the firefighter only needs to gently press the spring to complete the whole process, without the need to use additional tools or perform complicated operations.

[0032] In a further preferred embodiment of the utility model, a through opening is opened on the top of the assembly box 13, the inner diameter of the through opening is larger than the output rod of the electric hydraulic rod 14, and an inspection port is provided on one side of the assembly box 13, a detachable baffle is provided in the inspection port, a screw for limiting is provided on the baffle, and the screw is threadedly connected to the assembly box 13.

[0033] In this embodiment, a through opening is provided at the top of the assembly box 13. The design of this through opening allows the output rod of the electric hydraulic rod 14 to pass through the top of the assembly box 13 and connect with the drive frame 2. The inner diameter of the through opening is larger than the output rod of the electric hydraulic rod 14, ensuring that the output rod can smoothly pass through the through opening without being blocked during telescopic movement. An inspection port is provided on one side of the assembly box 13 for inspection and maintenance of the interior of the assembly box 13. A detachable baffle is provided in the inspection port, which can be easily disassembled and installed, thereby allowing maintenance personnel to enter the interior of the assembly box 13 to perform necessary operations. Screws for limiting are provided on the baffle. These screws are threadedly connected to the assembly box 13, and the baffle can be fixed or removed by tightening or loosening the screws. This design not only ensures the stability of the baffle, but also facilitates the disassembly and installation process of the baffle. The design of the through-port enables the output rod of the electric hydraulic rod 14 to smoothly pass through the assembly box 13 and connect with the drive frame 2, thereby ensuring the structural rationality and functionality of the entire lifting mechanism; the design of the inspection port and the detachable baffle makes the inspection and maintenance inside the assembly box 13 convenient and quick; firefighters or maintenance personnel can easily remove the baffle and enter the assembly box 13 for inspection or maintenance operations.

[0034] In a further preferred embodiment of the present invention, the connecting frame 15 is U-shaped, and the inner diameter of the connecting frame 15 is larger than the gas phase liquid nitrogen tank.

[0035] In this embodiment, the design of the U-shaped connecting frame 15 enables the assembly to be moved to a location close to the gas phase liquid nitrogen tank for nitrogen injection operations.

[0036] In summary, the liquid nitrogen filling auxiliary device provided by the technical solution effectively solves the operational inconvenience and safety risk problems caused by the excessively high neck position of the gas phase liquid nitrogen tank through reasonable structural design and functional configuration, and improves the work efficiency and operational safety of laboratory personnel.

[0037] Compared with the related art, through the design of the lifting base plate 1, the device can adjust the overall height as needed to compensate for the problem of the neck position of the gas phase liquid nitrogen tank being too high, thereby reducing the operating burden and improving work efficiency; secondly, the combination of the drive block 3 and the drive mechanism makes the lifting and lateral movement of the winding roller 5 and the liquid nitrogen filling pipe precisely controllable, enhancing the flexibility and convenience of operation; this design not only adapts to the operating requirements of different positions, but also reduces the risk of high-altitude operations; in addition, the coordinated use of the assembly box 13 and the electric hydraulic rod 14 provides a stable lifting function for the drive frame 2, further enhancing the stability and reliability of the device.

[0038] It is worth noting that the circuits, electronic components and modules involved in the present utility model are all prior art and can be fully implemented by those skilled in the art. Needless to say, the content protected by the present utility model does not involve improvements to software and methods.

[0039] In the several embodiments provided in the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only schematic, such as the division of the above-mentioned units, which is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be in the form of telecommunication or other forms.

[0040] The above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit the protection scope of the utility model. Obviously, the described embodiments are only some embodiments of the utility model, rather than all embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model. Although the utility model has been described in detail with reference to the above embodiments, ordinary technicians in this field can still combine, add, delete or make other adjustments to the features in the various embodiments of the utility model according to the circumstances without conflict, without making creative work, so as to obtain different other technical solutions that do not deviate from the concept of the utility model in essence, and these technical solutions also belong to the scope of protection of the utility model.

Claims

1. A liquid nitrogen filling auxiliary device, characterized in that: include: A lifting base plate, wherein a driving frame is arranged on the base plate; A driving block, wherein the driving block is arranged on the driving frame; A lifting frame, the lifting frame being fixed to the bottom end of the driving block; A winding roller, the winding roller is rotatably mounted on the lifting frame; A steel wire rope, wherein the steel wire rope is arranged on a winding roller, and a limit hook for hooking and fixing a liquid nitrogen filling pipe is fixedly installed on the bottom end of the steel wire rope; A first motor for driving the winding roller to rotate, wherein an output shaft of the first motor is fixedly connected to one end of a shaft of the winding roller; A driving mechanism for driving and regulating the lateral movement of the driving block, wherein the driving mechanism is arranged on the driving frame.

2. The liquid nitrogen filling auxiliary device according to claim 1, characterized in that: The driving mechanism comprises: Rotating a screw rod mounted on the driving frame, one end of the screw rod passing through the driving block; A guide rod fixed on the driving frame for limiting and guiding the driving block, the guide rod passing through the driving block; A second motor fixed to one side of the driving frame for driving the screw to rotate; A coupling is assembled on the output shaft of the second motor, and one end of the coupling is fixedly connected to one end of the screw.

3. The liquid nitrogen filling auxiliary device according to claim 1, characterized in that: An assembly box is fixedly installed on the top of the base plate, and an electric hydraulic rod for regulating the lifting of the driving frame is fixedly installed in the assembly box. The top end of the output rod of the electric hydraulic rod is fixedly connected to the driving frame.

4. The liquid nitrogen filling auxiliary device according to claim 1, characterized in that: A connecting frame is fixedly installed on one side of the base plate, a plurality of supporting columns are symmetrically fixedly installed on the bottom of the connecting frame and the bottom of the base plate, and a brake-type universal wheel is fixedly installed on the bottom ends of the plurality of supporting columns.

5. The liquid nitrogen filling auxiliary device according to claim 1, characterized in that: The limit hook is provided with an anti-slip bump, and the limit hook is provided with a press-type spring piece for clamping the liquid nitrogen filling pipe.

6. The liquid nitrogen filling auxiliary device according to claim 3, characterized in that: A through opening is provided on the top of the assembly box, the inner diameter of which is larger than the output rod of the electric hydraulic rod. An inspection port is provided on one side of the assembly box, a detachable baffle is provided in the inspection port, a screw for limiting is provided on the baffle, and the screw is threadedly connected to the assembly box.

7. The liquid nitrogen filling auxiliary device according to claim 4, characterized in that: The connecting frame is U-shaped, and the inner diameter of the connecting frame is larger than the gas phase liquid nitrogen tank.

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