Device for measuring height of liquid nitrogen in liquid nitrogen tank

Abstract

The invention relates to the technical field of liquid nitrogen measurement, and discloses a device for measuring the height of liquid nitrogen in a liquid nitrogen tank, which comprises a main body, and limiting plates are fixedly connected to the inner walls of the left side and the right side of the main body. When two second sliding plates slide downwards, the second sliding plates drive limiting rings and a plurality of auxiliary plates to generate downward pushing force on the top area of an inner layer sleeve, and at the moment, an inlet of the inner layer sleeve shrinks under pushing of the auxiliary plates and the limiting rings and makes contact with the surface of the measuring scale again; at the moment, two fulcrums and a stable guide structure can be formed on the surface of the contracted inner layer sleeve inlet and the contact between the two first sliding plates and the surface of the measuring scale after movement, so that the situation that the measuring scale inclines when being manually inserted for measurement can be reduced, and it is ensured that the average liquid level can be stably obtained; and the accuracy and the stability during measurement are improved.

Description

Technical Field

[0001] This invention relates to the field of liquid nitrogen measurement technology, specifically to a device for measuring the liquid nitrogen level in a liquid nitrogen tank. Background Technology

[0002] A liquid nitrogen tank is a container specifically designed for storing and transporting liquid nitrogen. It is designed to maintain a low temperature for extended periods to prevent the liquid nitrogen from evaporating too quickly. The liquid nitrogen level measuring device in the tank is mainly used to monitor and manage the amount of liquid nitrogen stored, ensuring the effective use and replenishment of liquid nitrogen.

[0003] When measuring the liquid nitrogen level in a liquid nitrogen tank, workers typically insert a measuring ruler vertically into the tank from the top, hold it until it touches the bottom, and then remove it. The liquid nitrogen level is then measured based on the ruler's scale and the frost level. However, when the measuring ruler is manually inserted into the tank, it is difficult to maintain a vertical position in the liquid nitrogen. This can cause the ruler to tilt and make it difficult to obtain a stable average liquid level on the ruler's scale, affecting the accuracy and stability of the height measurement. Summary of the Invention

[0004] The purpose of this invention is to provide a device for measuring the liquid nitrogen level in a liquid nitrogen tank, so as to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0006] This invention relates to a device for measuring the liquid nitrogen level in a liquid nitrogen tank, comprising a main body, with limit plates fixedly connected to the inner walls of the left and right sides of the main body, and further comprising:

[0007] A sliding mechanism is installed inside the main body to ensure the verticality of the measuring device when measuring the height of the fluid inside the main body.

[0008] The rotating mechanism is installed on the side wall of the sliding mechanism. The movement of the rotating mechanism can prevent the sliding mechanism from sticking together due to excessive cooling inside the main body.

[0009] Furthermore, the main body includes:

[0010] Auxiliary components are installed inside the main body to slow down the flow of space inside the main body during measurement;

[0011] The elastic component is installed on top of the limit plate.

[0012] Furthermore, the sliding mechanism includes a crossbar disposed on the top of the limiting plate, and the sliding mechanism also includes:

[0013] The swing assembly is installed on the side wall of the crossbar to ensure its verticality during the measurement process of the measuring device.

[0014] The closing component is installed at the bottom of the swing component. As the swing component slides, the closing component can push the top of the auxiliary component.

[0015] Furthermore, the rotating mechanism includes two fixed plates disposed at the bottom of the swing assembly, and the rotating mechanism also includes:

[0016] The telescopic component is installed on the side wall of the fixed plate to prevent the surface of the measuring device from being excessively rubbed by the swing component after the measurement is completed.

[0017] Furthermore, the two limiting plates are symmetrically arranged with the middle of the main body as the center;

[0018] The auxiliary components include an inner sleeve that is fixedly connected to the inner wall of the bottom of the main body, and a plug is provided on the top of the inner sleeve. The plug is slidably connected inside the main body.

[0019] Furthermore, a toothed frame is fixedly connected to the inner wall of the main body on the side near the limiting plate;

[0020] The elastic component includes several return springs disposed on the inner wall of the top of the main body, with the return springs arranged symmetrically in groups of three;

[0021] Each set of reset springs has an arc-shaped plate fixedly connected to its bottom. The front and back inner walls of the main entrance area are recessed, and the inner wall of the inner sleeve is corrugated.

[0022] Furthermore, the crossbar is slidably connected inside the toothed frame;

[0023] The swing assembly includes a sliding plate fixedly connected to the side wall of the crossbar, and a connecting plate rotatably connected to the side of the sliding plate near the limiting plate.

[0024] The end of the connecting plate away from the sliding plate one is rotatably connected to the sliding plate two, and the sliding plate two is slidably connected to the inside of the limiting plate.

[0025] Furthermore, the closing assembly includes a limiting ring rotatably connected to the bottom of the two sliding plates, and a number of auxiliary plates are rotatably connected to the outer surface of the limiting ring;

[0026] Several auxiliary plates have counterweight rings slidably connected to their tops.

[0027] Furthermore, two fixed plates are fixedly connected to the bottom of the sliding plate one;

[0028] The telescopic assembly includes a telescopic sleeve rotatably connected to the end of the fixed plate away from the sliding plate;

[0029] A central rod is slidably connected between the two telescopic sleeves. A limit spring is fixedly connected to the end of the central rod near the fixed plate, and the end of the limit spring away from the central rod is fixedly connected to the inner wall of the telescopic sleeve.

[0030] Furthermore, a rotating frame is slidably connected to the middle of the central rod, and a semicircular plate is fixedly connected to the side wall of the rotating frame. Two inclined plates are fixedly connected to the side of the semicircular plate near the central rod, and the two inclined plates are arranged in a V-shape.

[0031] The present invention has the following beneficial effects:

[0032] 1. In this invention, when the two sliding plates slide downwards, the two sliding plates will drive the limiting ring and multiple auxiliary plates to generate a downward pushing force on the top area of ​​the inner sleeve. At this time, the entrance of the inner sleeve will contract under the push of the auxiliary plates and multiple limiting rings and contact the surface of the measuring scale again. At this time, the contact between the entrance of the contracted inner sleeve and the surface of the measuring scale of the two sliding plates after movement can form two fulcrums and a stable guiding structure on its surface, thereby reducing the tilting of the measuring scale when manually inserted for measurement, ensuring that the average liquid level can be obtained stably, and improving the accuracy and stability of the measurement.

[0033] 2. In this invention, multiple auxiliary plates rotate downward on the surface of the limiting ring. At this time, the counterweight ring slides downward on the sidewalls of the multiple auxiliary plates, and the entrance area at the top of the inner sleeve contracts in the corrugated area of ​​the surface under the push of the limiting ring, the multiple auxiliary plates after movement, and the counterweight ring. At this time, the contraction of the inner sleeve can reduce the gas phase space of liquid nitrogen and reduce the natural evaporation rate of liquid nitrogen when the plug separates from the main body during the measurement process. This can ensure the integrity of the liquid nitrogen measurement process, further improve the accuracy of the liquid nitrogen measurement process, and improve the measurement efficiency.

[0034] 3. In this invention, the connecting plate pushes the sliding plate two and drives the limiting ring to reset. At this time, the side walls of multiple auxiliary plates will be closed and reset under the obstruction of the bottom of the plug. The closed auxiliary plates will then block the bottom part of the sliding plate one on the outer surface of the plug, thereby further reducing the situation of cold adhesion and excessive movement resistance of the sliding plate one under the influence of liquid nitrogen cold gas. This can improve the continuity and movement strength of the sliding plate one during measurement, and further enhance the measurement strength and efficiency of the measuring scale during measurement.

[0035] 4. In this invention, when the two telescopic sleeves approach each other, a tensile force is generated at both ends of the sliding plate. When the two ends of the sliding plate are subjected to tensile force, the middle area of ​​the sliding plate separates from the side wall of the measuring scale. When the sliding plate separates from the measuring scale, it can ensure the smoothness of the measuring scale when it is pulled out. At the same time, it can reduce the frost and blurring of the surface of the measuring scale caused by the contact between the measuring scale and the sliding plate during the pulling out. In this way, it can ensure the clarity of the scale on the measuring scale and further improve the accuracy of the measurement.

[0036] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0039] Figure 2 This is a schematic diagram of the overall partial cross-sectional structure of the present invention;

[0040] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle;

[0041] Figure 4 This is a partial cross-sectional schematic diagram of the inner sleeve of the present invention;

[0042] Figure 5 This is a partial exploded cross-sectional view of the auxiliary component of the present invention;

[0043] Figure 6 This is a schematic diagram of the elastic component of the present invention;

[0044] Figure 7 This is a schematic diagram of the swing component of the present invention;

[0045] Figure 8 This is a schematic diagram of the explosion of the swing component of the present invention;

[0046] Figure 9 This is a partial cross-sectional schematic diagram of the telescopic component of the present invention;

[0047] Figure 10 For invention Figure 9 Enlarged diagram of point B in the middle.

[0048] The attached diagram lists the components represented by each number as follows:

[0049] In the diagram: 1. Main body; 101. Limiting plate; 11. Auxiliary component; 111. Inner sleeve; 112. Plug cap; 113. Toothed frame; 12. Elastic component; 121. Return spring; 122. Arc plate; 2. Sliding mechanism; 201. Crossbar; 21. Swing component; 211. Sliding plate one; 212. Connecting plate; 213. Sliding plate two; 22. Closing component; 221. Limiting ring; 222. Auxiliary plate; 223. Counterweight ring; 3. Rotating mechanism; 301. Fixed plate; 31. Telescopic component; 311. Telescopic sleeve; 312. Center rod; 313. Rotating frame; 314. Semicircular plate. Detailed Implementation

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] Please see Figures 1-10 As shown, the present invention is a device for measuring the liquid nitrogen level in a liquid nitrogen tank, comprising a main body 1, wherein limit plates 101 are fixedly connected to the left and right inner walls of the main body 1, and further comprising:

[0052] The sliding mechanism 2 is installed inside the main body 1 to ensure the verticality of the measuring device when measuring the height of the fluid inside the main body 1.

[0053] The rotating mechanism 3 is installed on the side wall of the sliding mechanism 2. The movement of the rotating mechanism 3 can prevent the sliding mechanism 2 from sticking together due to excessive cooling inside the main body 1.

[0054] Entity 1 includes:

[0055] Auxiliary component 11 is installed inside the main body 1 to slow down the flow of space inside the main body 1 during measurement;

[0056] Elastic component 12 is installed on top of limit plate 101.

[0057] The sliding mechanism 2 includes a crossbar 201 disposed on the top of the limiting plate 101, and the sliding mechanism 2 also includes:

[0058] The swing assembly 21 is installed on the side wall of the crossbar 201 to ensure its verticality during the measurement process of the measuring device.

[0059] The closing component 22 is installed at the bottom of the swing component 21. The closing component 22 can push the top of the auxiliary component 11 as the swing component 21 slides.

[0060] The rotating mechanism 3 includes two fixed plates 301 disposed at the bottom of the swing assembly 21, and the rotating mechanism 3 also includes:

[0061] The telescopic component 31 is installed on the side wall of the fixed plate 301 to prevent the surface of the measuring device from being excessively rubbed by the swing component 21 after the measurement is completed.

[0062] The two limiting plates 101 are symmetrically arranged with the middle of the main body 1 as the center;

[0063] The auxiliary component 11 includes an inner sleeve 111 fixedly connected to the inner wall of the bottom of the main body 1. A plug 112 is provided on the top of the inner sleeve 111. The plug 112 is slidably connected to the inside of the main body 1. First, the staff opens the sealing cover at the entrance of the main body 1 and pulls out the plug 112. Then, the measuring scale to be measured is inserted into the inside of the main body 1 from the entrance at the top of the main body 1.

[0064] A toothed frame 113 is fixedly connected to the inner wall of the main body 1 on the side near the limiting plate 101;

[0065] The elastic component 12 includes a plurality of return springs 121 disposed on the inner wall of the top of the main body 1, and the plurality of return springs 121 are symmetrically distributed in groups of three;

[0066] Each set of return springs 121 has an arc-shaped plate 122 fixedly connected to its bottom. The front and back inner walls of the entrance area of ​​the main body 1 are recessed, and the inner wall of the inner sleeve 111 is corrugated. When the plug 112 is pulled out from the entrance of the main body 1, the side wall of the plug 112 is no longer in contact with the side wall of the sliding plate 211. At this time, the arc-shaped plate 122 will slide downward under the elastic release force of the multiple return springs 121.

[0067] The crossbar 201 is slidably connected inside the toothed frame 113;

[0068] The swing assembly 21 includes a sliding plate 211 fixedly connected to the side wall of the crossbar 201, and a connecting plate 212 is rotatably connected to the side of the sliding plate 211 near the limiting plate 101.

[0069] The end of the connecting plate 212 away from the sliding plate 211 is rotatably connected to the sliding plate 213. The sliding plate 213 is slidably connected to the inside of the limiting plate 101. When the connecting plate 212 changes to a horizontal state, the connecting plate 212 will push the bottom of the sliding plate 211 so that the two sliding plates 211 slide closer to each other. When the sliding plate 211 slides to the recess of the side wall of the main body 1, the sliding plate 211 will move from a bent state to a flat state under its own elasticity.

[0070] The closing component 22 includes a limiting ring 221 rotatably connected to the bottom of two sliding plates 213, and a plurality of auxiliary plates 222 are rotatably connected to the outer surface of the limiting ring 221;

[0071] A counterweight ring 223 is slidably connected to the top of several auxiliary plates 222. When two sliding plates 213 push the limiting ring 221 downward, the sliding of the limiting ring 221 will cause multiple auxiliary plates 222 and the counterweight ring 223 to slide downward synchronously. When the limiting ring 221 slides downward, the limiting ring 221 will generate a downward pushing force at the top entrance of the inner sleeve 111.

[0072] Two fixed plates 301 are fixedly connected to the bottom of the sliding plate 211;

[0073] The telescopic assembly 31 includes a telescopic sleeve 311 that is rotatably connected to the end of the fixed plate 301 away from the sliding plate 211;

[0074] A central rod 312 is slidably connected between the two telescopic sleeves 311. A limit spring is fixedly connected to one end of the central rod 312 near the fixed plate 301. The end of the limit spring away from the central rod 312 is fixedly connected to the inner wall of the telescopic sleeve 311. When the sliding plate 211 is in a flat state, the two ends of the sliding plate 211 will drive the two telescopic sleeves 311 to slide away from each other. At this time, the protrusions at the ends of the two telescopic sleeves 311 that are close to each other will slide to the side wall of the inclined plate on the semicircular plate 314.

[0075] A rotating frame 313 is slidably connected to the middle of the central rod 312. A semicircular plate 314 is fixedly connected to the side wall of the rotating frame 313. Two inclined plates are fixedly connected to the side of the semicircular plate 314 near the central rod 312. The two inclined plates are arranged in a V-shape. The upward sliding of the measuring scale will drive the semicircular plate 314 to rotate upward on the surface of the central rod 312 through friction. When the semicircular plate 314 rotates upward, the two inclined plates on the side wall of the semicircular plate 314 will squeeze the protrusions on the two telescopic sleeves 311.

[0076] In use, the staff first open the sealing cover at the entrance of the main body 1 and pull out the plug 112. Then, the measuring scale to be measured is inserted into the interior of the main body 1 from the entrance at the top of the main body 1. The bottom of the measuring scale is brought into contact with the bottom inner wall of the main body 1 and held briefly. Then the measuring scale is pulled out. The liquid nitrogen height inside the main body 1 is measured according to the scale on the measuring scale and the height of the frost on the surface.

[0077] When the plug 112 is pulled out from the inlet of the main body 1, the side wall of the plug 112 is no longer in contact with the side wall of the sliding plate 211. At this time, the arc plate 122 will slide downward under the elastic release force of multiple return springs 121. When the arc plate 122 slides downward, it will generate a downward pushing force on the top of the sliding plate 213. When the sliding plate 213 slides downward under the pushing force, the sliding of the sliding plate 213 will drive the connecting plate 212 to slide synchronously and change the connecting plate 212 from an inclined state to a horizontal state. During the transition of the connecting plate 212 to a horizontal state, the connecting plate 212 pushes the bottom of the sliding plate 211, causing the two sliding plates 211 to slide closer to each other. When the sliding plate 211 slides to the recessed area on the side wall of the main body 1, the sliding plate 211 will move from a bent state to a flat state due to its own elasticity. When the bottom ends of the two sliding plates 211 approach each other, the two sliding plates 211 will form a tapered guide structure that is larger at the top and smaller at the bottom at the entrance of the main body 1. Then, when the measuring scale is inserted into the main body 1... The end of the measuring scale will first contact the inclined surface of the sliding plate 211 after the movement. At this time, the side wall of the sliding plate 211 will guide the measuring scale, so that the measuring scale slides to the central axis of the main body 1 and maintains the vertical state when it enters the main body 1. At the same time, the bottoms of the two sliding plates 211 will also contact the side wall of the measuring scale when they come closer to each other. Meanwhile, when the two sliding plates 213 slide downward, the sliding plates 213 will drive the limiting ring 221 and multiple auxiliary plates 222 to the top area of ​​the inner sleeve 111. The field generates a downward pushing force, at which point the inlet of the inner sleeve 111 will retract under the push of the auxiliary plate 222 and multiple limiting rings 221 and re-contact the surface of the measuring scale. At this time, the contact between the inlet of the retracted inner sleeve 111 and the two sliding plates 211 after movement with the surface of the measuring scale can form two fulcrums and a stable guiding structure on its surface, thereby reducing the tilting of the measuring scale when manually inserted for measurement, ensuring that the average liquid level can be obtained stably, and improving the accuracy and stability of the measurement.

[0078] When the two sliding plates 213 push the limiting ring 221 downward, the sliding of the limiting ring 221 will cause multiple auxiliary plates 222 and the counterweight ring 223 to slide downward simultaneously. When the limiting ring 221 slides downward, it will generate a downward pushing force on the top entrance of the inner sleeve 111. At the same time, when the worker pulls out the plug 112, the bottom of the plug 112 will no longer block the side walls of the auxiliary plates 222. At this time, the multiple auxiliary plates 222 will rotate downward on the surface of the limiting ring 221. At this time, the counterweight ring... 223 will slide downwards along the sidewalls of the multiple auxiliary plates 222, and the entrance area at the top of the inner sleeve 111 will contract in the corrugated area of ​​the surface under the push of the limiting ring 221, the multiple auxiliary plates 222 after movement, and the counterweight ring 223. At this time, the contraction of the inner sleeve 111 can reduce the gas phase space of liquid nitrogen and reduce the natural evaporation rate of liquid nitrogen when the plug 112 separates from the main body 1 during the measurement process. This can ensure the integrity of the liquid nitrogen measurement process, further improve the accuracy of the liquid nitrogen measurement process, and improve the measurement efficiency.

[0079] When the worker pulls the plug 112 out of the main body 1 and inserts the measuring scale, the upward movement of the plug 112 will cause the sliding plate 211 to slide upward synchronously through the friction between its surface and the sliding plate 211. When the sliding plate 211 slides upward, it will cause the crossbar 201 to slide within the toothed frame 113. When the crossbar 201 slides within the toothed frame 113, its surface will periodically vibrate under the toothed components within the toothed frame 113. This vibration of the crossbar 201 can be transmitted to the limiting ring 221, connecting plate 212, sliding plate 213, and other structures. This vibration can reduce the cold adhesion of some structural components caused by prolonged exposure to liquid nitrogen to the limiting ring 221 and sliding plate 211. In this case, when the plug 112 is inserted into the inlet of the main body 1, the plug 112 will push the sliding plate 211 to reset. When the sliding plate 211 is reset, it will push the sliding plate 213 through the connecting plate 212 and drive the limiting ring 221 to reset. At this time, the side walls of the multiple auxiliary plates 222 will be closed and reset under the obstruction of the bottom of the plug 112. The closed multiple auxiliary plates 222 will block the bottom part of the sliding plate 211 on the outer surface of the plug 112, thereby further reducing the situation of cold adhesion and excessive movement resistance of the sliding plate 211 under the influence of liquid nitrogen cold gas, thereby improving the continuity and movement strength of the sliding plate 211 during measurement, and further enhancing the measurement strength and measurement efficiency of the measuring scale during measurement.

[0080] When the sliding plate 211 slides to the recesses on the front and back of the main body 1, and the sliding plate 211 is in a flat state, the two ends of the sliding plate 211 will drive the two telescopic sleeves 311 to slide away from each other. At this time, the protrusions at the ends of the two telescopic sleeves 311 that are close to each other will slide to the side wall of the inclined plate on the semicircular plate 314. When the sliding plate 211 contacts the surface of the measuring scale, the side wall of the semicircular plate 314 will also contact the side wall of the measuring scale. After the measurement is completed and the measuring scale is pulled out of the main body 1, the upward sliding of the measuring scale will drive the semicircular plate 314 to rotate upward on the surface of the central rod 312 through friction. When the semicircular plate 314 rotates upward, the two inclined plates on the side wall of the semicircular plate 314 will contact the two telescopic sleeves. The protrusions on 311 are squeezed, and the two telescopic sleeves 311 slide closer to each other under the push of the two inclined plates. When the two telescopic sleeves 311 approach each other, a tensile force is generated at both ends of the sliding plate 211. When the two ends of the sliding plate 211 are subjected to tensile force, the middle area of ​​the sliding plate 211 will separate from the side wall of the measuring scale. When the sliding plate 211 separates from the measuring scale, it can ensure the smoothness of the measuring scale when it is pulled out. At the same time, it can reduce the frost and blurring of the surface of the measuring scale caused by the contact between the measuring scale and the sliding plate 211 during the pulling out. In this way, it can ensure the clarity of the scale on the measuring scale and further improve the accuracy of the measurement.

[0081] Among them, the inner sleeve 111 can be made of polytetrafluoroethylene (PTFE) material, and the sliding plate 211 can be made of 304 stainless steel. This material has good toughness, does not become brittle, and does not stick together when exposed to liquid nitrogen.

[0082] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A device for measuring the liquid nitrogen level in a liquid nitrogen tank, comprising a main body (1), wherein limit plates (101) are fixedly connected to the left and right inner walls of the main body (1), characterized in that, Also includes: A sliding mechanism (2) is installed inside the main body (1) to ensure the verticality of the measuring device when measuring the height of the fluid inside the main body (1); Rotating mechanism (3) is installed on the side wall of sliding mechanism (2). The movement of rotating mechanism (3) can prevent sliding mechanism (2) from cold sticking in the main body (1) due to excessive cooling.

2. The device for measuring the liquid nitrogen level in a liquid nitrogen tank according to claim 1, characterized in that: The main body (1) includes: An auxiliary component (11) is installed inside the main body (1) to slow down the flow of space inside the main body (1) during measurement; An elastic component (12) is mounted on top of a limiting plate (101).

3. The device for measuring the liquid nitrogen level in a liquid nitrogen tank according to claim 2, characterized in that: The sliding mechanism (2) includes a crossbar (201) disposed on the top of the limiting plate (101), and the sliding mechanism (2) further includes: A swing assembly (21) is installed on the side wall of the crossbar (201) to ensure its verticality during the measurement process of the measuring device; The closing component (22) is installed at the bottom of the swing component (21). The closing component (22) can push the top of the auxiliary component (11) as the swing component (21) slides.

4. The device for measuring the liquid nitrogen level in a liquid nitrogen tank according to claim 3, characterized in that: The rotating mechanism (3) includes two fixed plates (301) disposed at the bottom of the swing assembly (21), and the rotating mechanism (3) further includes: Telescopic component (31) is installed on the side wall of fixed plate (301) to prevent the surface of the measuring device from being excessively rubbed by the swing component (21) after the measurement is completed.

5. The device for measuring the liquid nitrogen level in a liquid nitrogen tank according to claim 4, characterized in that: The two limiting plates (101) are symmetrically arranged with the middle part of the main body (1) as the center; The auxiliary component (11) includes an inner sleeve (111) fixedly connected to the inner wall of the bottom of the main body (1), and a plug (112) is provided on the top of the inner sleeve (111), and the plug (112) is slidably connected to the inside of the main body (1).

6. The device for measuring the liquid nitrogen level in a liquid nitrogen tank according to claim 4, characterized in that: A toothed frame (113) is fixedly connected to the inner wall of the main body (1) near the limiting plate (101). The elastic component (12) includes a plurality of return springs (121) disposed on the inner wall of the top of the main body (1), and the plurality of return springs (121) are symmetrically distributed in groups of three; Each set of return springs (121) has an arc-shaped plate (122) fixedly connected to its bottom.

7. The device for measuring the liquid nitrogen level in a liquid nitrogen tank according to claim 6, characterized in that: The crossbar (201) is slidably connected inside the toothed frame (113); The swing assembly (21) includes a sliding plate (211) fixedly connected to the side wall of the crossbar (201), and a connecting plate (212) is rotatably connected to the side of the sliding plate (211) near the limiting plate (101). The end of the connecting plate (212) away from the sliding plate one (211) is rotatably connected to the sliding plate two (213), and the sliding plate two (213) is slidably connected to the inside of the limiting plate (101).

8. The device for measuring the liquid nitrogen level in a liquid nitrogen tank according to claim 7, characterized in that: The closing component (22) includes a limiting ring (221) rotatably connected to the bottom of two sliding plates (213), and a plurality of auxiliary plates (222) are rotatably connected to the outer surface of the limiting ring (221). A counterweight ring (223) is slidably connected to the top of several of the auxiliary plates (222).

9. The device for measuring the liquid nitrogen level in a liquid nitrogen tank according to claim 7, characterized in that: The two fixing plates (301) are fixedly connected to the bottom of the sliding plate (211); The telescopic assembly (31) includes a telescopic sleeve (311) rotatably connected to the end of the fixed plate (301) away from the sliding plate (211). A central rod (312) is slidably connected between the two telescopic sleeves (311). A limit spring is fixedly connected to one end of the central rod (312) near the fixed plate (301), and the end of the limit spring away from the central rod (312) is fixedly connected to the inner wall of the telescopic sleeve (311).

10. The device for measuring the liquid nitrogen level in a liquid nitrogen tank according to claim 9, characterized in that: A rotating frame (313) is slidably connected to the middle of the central rod (312), and a semicircular plate (314) is fixedly connected to the side wall of the rotating frame (313). Two inclined plates are fixedly connected to the side of the semicircular plate (314) near the central rod (312).

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