CN113785823B - Experimental device for accurately cooling by using liquid nitrogen tank and using method - Google Patents
Experimental device for accurately cooling by using liquid nitrogen tank and using method Download PDFInfo
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- CN113785823B CN113785823B CN202111072718.8A CN202111072718A CN113785823B CN 113785823 B CN113785823 B CN 113785823B CN 202111072718 A CN202111072718 A CN 202111072718A CN 113785823 B CN113785823 B CN 113785823B
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- fixedly connected
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N1/00—Preservation of bodies of humans or animals, or parts thereof
- A01N1/02—Preservation of living parts
- A01N1/0236—Mechanical aspects
- A01N1/0242—Apparatuses, i.e. devices used in the process of preservation of living parts, such as pumps, refrigeration devices or any other devices featuring moving parts and/or temperature controlling components
- A01N1/0252—Temperature controlling refrigerating apparatus, i.e. devices used to actively control the temperature of a designated internal volume, e.g. refrigerators, freeze-drying apparatus or liquid nitrogen baths
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/14—Measuring arrangements characterised by the use of mechanical techniques for measuring distance or clearance between spaced objects or spaced apertures
Abstract
The invention discloses an experimental device for accurately cooling by using a liquid nitrogen tank and a using method thereof, wherein the experimental device comprises the liquid nitrogen tank and is characterized in that a dividing ring is fixedly connected to the top of the liquid nitrogen tank, a plurality of mounting grooves are formed in the inner wall of the dividing ring at equal intervals in the circumferential direction, a lifting bucket is arranged in each mounting groove and comprises a telescopic bucket handle and a bucket body connected to the telescopic bucket handle in a sliding manner, a floating plate is fixedly connected to the bottom end of the telescopic bucket handle, the bucket body is positioned above the floating plate, a temperature sensor is fixedly connected to the bottom surface of the bucket body, and a first distance measuring mechanism and a second distance measuring mechanism are arranged on the telescopic bucket handle. The length of the telescopic barrel handle can be adjusted through the telescopic mechanism, the telescopic barrel handle is guaranteed to be suitable for liquid nitrogen tanks with different liquid level heights, the descending height is observed through the tape measure on the winding roller, and the distance between the barrel body and the liquid level is determined through comparison with the numerical value of the scale mark on the traction belt, so that the accuracy of an experiment is guaranteed.
Description
Technical Field
The invention relates to the technical field of biology, in particular to an experimental device for accurately cooling by using a liquid nitrogen tank and a using method thereof.
Background
In a laboratory, when a liquid nitrogen tank is used for carrying out related experiments of ultra-low temperature freezing preservation of germ cells (sperms, ova and the like), gradient cooling is often carried out by using a two-step method and a three-step method. The two methods both adopt the method of artificially controlling the distance of the liquid nitrogen lifting barrel above the liquid level of the liquid nitrogen to control the temperature reduction gradient. The method has three disadvantages, namely, the liquid nitrogen tank has a small opening, the distance between the liquid nitrogen lifting barrel and the liquid nitrogen liquid level cannot be seen by naked eyes, the distance is controlled mostly by the feeling of technicians, the influence of human factors is large, and the experiment repeatability is poor; secondly, the length of a telescopic barrel handle of a common liquid nitrogen lifting barrel cannot be adjusted, and a technician needs to prop the telescopic barrel handle on the wall of a liquid nitrogen tank opening by using gauze to fix the telescopic barrel handle at a certain height, only one liquid nitrogen lifting barrel can be placed at a time, so that few experimental samples are stored, and the experimental efficiency is low; thirdly, different liquid nitrogen tanks have different specifications, and even if the distance between the liquid nitrogen lifting barrel and the upper part of the liquid level of the liquid nitrogen is the same, the temperature is not nearly the same, and the experimental error is large. Therefore, there is a need for an experimental sample holding device that can accurately control the distance above the liquid level of liquid nitrogen, fix and measure the temperature, so as to solve the problem.
Disclosure of Invention
The invention aims to provide an experimental device for accurately cooling by using a liquid nitrogen tank and a using method thereof, so as to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following scheme: the invention provides an experimental device for accurately cooling by using a liquid nitrogen tank and a using method thereof, wherein the experimental device comprises the liquid nitrogen tank and is characterized in that a dividing ring is fixedly connected to the top of the liquid nitrogen tank, a plurality of mounting grooves are formed in the inner wall of the dividing ring at equal intervals in the circumferential direction, a plurality of lifting barrels are mounted in the mounting grooves, each lifting barrel comprises a telescopic barrel handle and a barrel body connected to the telescopic barrel handle in a sliding manner, a floating plate is fixedly connected to the bottom end of the telescopic barrel handle, the barrel body is positioned above the floating plate, a temperature sensor is fixedly connected to the bottom surface of the barrel body, a first distance measuring mechanism and a second distance measuring mechanism are arranged on the telescopic barrel handle, the first distance measuring mechanism is arranged corresponding to the barrel body, and the second distance measuring mechanism is arranged corresponding to the floating plate.
Preferably, the telescopic bucket handle comprises a first connecting pipe and a second connecting pipe, the inner wall of the first connecting pipe is connected with the outer wall of the second connecting pipe in a sliding mode, and the floating plate is fixedly connected to the bottom end of the second connecting pipe.
Preferably, the first distance measuring mechanism comprises a rotating shaft which is rotatably connected to the top end of the first connecting pipe; the winding wheel is fixedly connected to the rotating shaft and located inside the first connecting pipe, one end of a traction belt is fixedly connected to the winding wheel, the other end of the traction belt is fixedly connected with the top surface of the floating plate, and scale marks are arranged on one side of the traction belt.
Preferably, the second distance measuring mechanism comprises a winding roller rotatably connected in the first connecting pipe, the winding roller is arranged in parallel with the rotating shaft, one end of a tape measure is fixedly wound on the winding roller, a stepped shaft is rotatably connected in the first connecting pipe, the winding roller is in transmission fit with the stepped shaft, the stepped shaft is positioned below the winding roller, the other end of the tape measure is fixedly connected with the middle part of the stepped shaft, one side of the telescopic bucket handle is slidably connected with a connecting part, and the bucket body is fixedly connected with one side of the connecting part, which is far away from the bucket handle; the top end of the connecting part is fixedly connected with one end of a traction wire, and the other end of the traction wire is fixedly wound on the stepped shaft.
Preferably, the winding roller and the rotating shaft are both provided with a limiting part;
spacing portion includes the telescopic link, two telescopic link one end respectively with the wind-up roll rotation axis fixed connection, the first spacing latch of telescopic link outer wall fixedly connected with, the telescopic link is kept away from the one end of first even pipe runs through the spacing latch of first spacing latch and fixedly connected with second, first spacing latch with the spacing cooperation of the spacing latch of second, the spacing latch of second is kept away from one side fixedly connected with adjust knob of telescopic link.
Preferably, connecting portion include with the connecting plate of first company pipe, the even pipe slip joint of second, the connecting plate is close to the mounting groove has all been seted up to the both sides of flexible bucket handle, fixedly connected with spring one end in the mounting groove, spring other end fixedly connected with mount pad, mount pad sliding connection be in the mounting groove, the mount pad is kept away from one side of spring is rotated and is connected with the ball, first company pipe, the even pipe of second are close to the spout has been seted up to one side of connecting plate, the spout with ball looks adaptation.
Preferably, the number of the mounting grooves is 2-8.
The use method of the experimental device for accurately cooling by using the liquid nitrogen tank comprises the following steps:
1) putting the lifting barrel into a liquid nitrogen tank, and adjusting the length of the telescopic barrel handle by using a first distance measuring mechanism until the floating plate is contacted with the liquid level;
2) adjusting the distance between the barrel body and the floating plate by using a second distance measuring mechanism
3) Determining a current height temperature value by observing a temperature signal transmitted by a temperature sensor;
4) and (5) sealing and storing the liquid nitrogen tank.
The invention discloses the following technical effects: the distance between the first connecting pipe and the second connecting pipe can be controlled through the second distance measuring mechanism, so that the length of the telescopic barrel handle is adjusted, the telescopic barrel handle is suitable for liquid nitrogen tanks with different liquid level heights, the descending height of the barrel body is controlled by using the winding roller, the descending height is observed through a measuring tape on the winding roller, the distance between the barrel body and the floating plate is determined through comparison with the number of the scale marks on the traction belt, the distance between the barrel body and the liquid level is further determined, the temperature value of the current distance is measured through the temperature sensor, and the accuracy of an experiment is guaranteed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is an isometric view of an experimental apparatus for accurate cooling using a liquid nitrogen tank of the present invention;
FIG. 2 is a front view of an experimental apparatus for precise cooling using a liquid nitrogen tank according to the present invention;
FIG. 3 is a cross-sectional view taken along line C-C of FIG. 2;
FIG. 4 is an enlarged view taken at A in FIG. 1;
FIG. 5 is a top view of an experimental apparatus for precise cooling using a liquid nitrogen tank according to the present invention;
FIG. 6 is a schematic structural view of a position-limiting portion according to the present invention;
FIG. 7 is a schematic view of the construction of the index ring of the present invention;
FIG. 8 is a schematic structural diagram of the limiting portion of the present invention.
The automatic winding machine comprises a first connecting pipe-1, a second connecting pipe-2, a barrel body-3, a floating plate-4, a rotating shaft-5, a traction belt-6, a winding wheel-7, an adjusting knob-8, a winding roller-9, a measuring tape-10, a traction wire-11, a second limiting latch-12, a dividing ring-13, a stepped shaft-14, a first limiting latch-15, a temperature sensor-16, a connecting plate-17, a spring-18, a mounting seat-19 and a ball-20.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The invention provides an experimental device for accurately cooling by using a liquid nitrogen tank, which comprises the liquid nitrogen tank and is characterized in that a dividing ring 13 is fixedly connected to the top of the liquid nitrogen tank, a plurality of mounting grooves are formed in the inner wall of the dividing ring 13 at equal intervals in the circumferential direction, a lifting bucket is arranged in each mounting groove and comprises a telescopic bucket handle and a bucket body 3 connected to the telescopic bucket handle in a sliding mode, a floating plate 4 is fixedly connected to the bottom end of the telescopic bucket handle, the bucket body 3 is located above the floating plate 4, a temperature sensor 16 is fixedly connected to the bottom surface of the bucket body 3, a first distance measuring mechanism and a second distance measuring mechanism are arranged on the telescopic bucket handle, the first distance measuring mechanism is arranged corresponding to the bucket body 3, and the second distance measuring mechanism is arranged corresponding to the floating plate 4.
Further, for guaranteeing that flexible bucket handle length is adjustable, flexible bucket handle includes first connecting pipe 1 and second connecting pipe 2, and 1 inner wall of first connecting pipe and 2 outer wall sliding connection of second connecting pipe, 4 fixed connection of kickboard are in 2 bottoms of second connecting pipe. Through the flexible length between first distance measurement mechanism control second even pipe 2 and the first even pipe 1, guarantee flexible bucket handle and be applicable to the different liquid level height condition, can set up on the couple picture at first even pipe 1 top simultaneously and do not demonstrate for guarantee that the integrated device fixes the device when placing for a long time in with the liquid nitrogen jar.
Furthermore, a first distance measuring mechanism is arranged for controlling the length of the telescopic barrel handle, and comprises a rotating shaft 5 which is rotatably connected to the top end of the first connecting pipe 1; fixedly connected with rolling wheel 7 on rotation axis 5, rolling wheel 7 is located first connecting pipe 1 inside, and fixedly connected with traction belt 6's one end is gone up to rolling wheel 7, and traction belt 6 other end and 4 top surfaces fixed connection of kickboards are provided with the scale mark on one side of traction belt 6. The winding wheel 7 drives the traction belt 6 to rotate, the traction belt 6 pulls the second connecting pipe 2 to move upwards, the reverse rotation is realized, under the action of gravity, the second connecting pipe 2 moves downwards, meanwhile, the spring 18 can be fixed on a spring 18 figure at the top of the floating plate 4, the other end of the spring 18 is fixedly connected with the side wall of the first connecting pipe 1, when the length of the telescopic barrel handle is minimum, the spring 18 is in a compression state, and when the length of the telescopic barrel handle is longest, the spring 18 is in a relaxation state, so that the stable sliding between the second connecting pipe 2 and the first connecting pipe 1 is ensured.
Further, in order to control the distance between the barrel body 3 and the floating plate 4, a second distance measuring mechanism is arranged, the second distance measuring mechanism comprises a winding roller 9 which is rotatably connected in the first connecting pipe 1, the winding roller 9 is arranged in parallel with the rotating shaft 5, one end of a tape measure 10 is fixedly wound on the winding roller 9, a stepped shaft 14 is rotatably connected inside the first connecting pipe 1, the winding roller 9 is in transmission fit with the stepped shaft 14, the stepped shaft 14 is positioned below the winding roller 9, the other end of the tape measure 10 is fixedly connected with the middle part of the stepped shaft 14, one side of the telescopic barrel handle is slidably connected with a connecting part, and the barrel body 3 is fixedly connected with one side of the connecting part, which is far away from the barrel handle; the top end of the connecting part is fixedly connected with one end of a traction wire 11, and the other end of the traction wire 11 is fixedly wound on a stepped shaft 14. The scale lines of the tape measure 10 are in line marking when the barrel body 3 is in an initial state, the tape measure 10 extends along with the sliding of the barrel body 3 on the sliding rail, the moving distance of the barrel body 3 on the sliding rail is controlled, the line marking on the traction belt 6 displays the extending length of the telescopic barrel handle, and the distance between the barrel body 3 and the floating plate 4 can be known through comparison with the sliding length of the barrel body 3, so that the distance between the barrel body 3 and the liquid level of liquid nitrogen can be obtained. When the barrel body 3 does not slide on the sliding rail, only one end of the measuring tape 10 is fixedly connected with the stepped shaft 14, and the rest parts are wound on the winding roller 9.
Further, limiting parts are arranged on the winding roller 9 and the rotating shaft 5; spacing portion includes the telescopic link, two telescopic link one ends respectively with wind-up roll 9, 5 fixed connection of rotation axis, the first spacing latch 15 of telescopic link outer wall fixedly connected with, the telescopic link is kept away from the one end of first even pipe 1 and is run through the spacing latch 12 of first spacing latch 15 and fixedly connected with second, the spacing cooperation of first spacing latch 15 and the spacing latch 12 of second, one side fixedly connected with adjust knob 8 that the telescopic link was kept away from to the spacing latch 12 of second. The similar ratchet meshing of the spacing latch 12 meshing effect of first spacing latch 15 and second can realize the unilateral and rotate, when needs reverse and shorten flexible barrel handle length, and the outside extension draw bar makes first spacing latch 15 and the spacing latch 12 of second part, reverses control knob, realizes flexible barrel handle length shrink.
Furthermore, in order to improve the experimental efficiency, the number of the mounting grooves is 2-8, preferably 6.
Further, for reducing the frictional force between connecting plate 17 and the slide rail, guarantee that ladle body 3 steadily slides on the slide rail, connecting portion include with first connecting pipe 1, the second is connecting pipe 2 slip joint's connecting plate 17, the mounting groove has all been seted up to connecting plate 17 near the both sides of flexible bucket handle, fixedly connected with spring 18 one end in the mounting groove, spring 18 other end fixedly connected with mount pad 19, 19 sliding connection of mount pad is in the mounting groove, one side that spring 18 was kept away from to mount pad 19 is rotated and is connected with ball 20, first connecting pipe 1, the spout has been seted up to one side that second is connecting pipe 2 and is close to connecting plate 17, spout and ball 20 looks adaptation. The spring 18 is always in a compressed state, and when the connecting plate 17 slides from the first connecting pipe 1 to the second connecting pipe 2, the spring 18 ejects the mounting seat 19 and the ball 20, so that the ball 20 is in sliding connection with the sliding groove on the second connecting pipe 2, and the sliding plate is guaranteed to be suitable for the first connecting pipe 1 and the second connecting pipe 2 at the same time.
The invention provides a use method of an experimental device for accurately cooling by using a liquid nitrogen tank, which specifically comprises the following steps:
1) putting the lifting barrel into a liquid nitrogen tank, and adjusting the length of the telescopic barrel handle by using a first distance measuring mechanism until the floating plate 4 is contacted with the liquid level;
2) the distance between the barrel body 3 and the floating plate 4 is adjusted by a second distance measuring mechanism
3) Determining the current height temperature value by observing the temperature signal transmitted by the temperature sensor 16;
4) and (5) sealing and storing the liquid nitrogen tank.
When the novel liquid nitrogen liquid level gauge is used, the rotating shaft 5 is controlled to rotate through the adjusting knob 8, the winding wheel drives the winding wheel to rotate in a winding mode, the traction belt 6 pulls the second connecting pipe 2 to move upwards and rotate reversely, the second connecting pipe 2 moves downwards under the action of gravity, the length of the telescopic barrel handle is increased until the floating plate 4 is in contact with the liquid level of liquid nitrogen, the winding roller 9 is controlled to rotate through rotating the adjusting knob 8 on the winding roller 9, the tape measure 10 on the winding roller 9 extends, the stepped shaft 14 rotates under the action of the pulling force of the barrel body 3 and the connecting plate 17, the length of the traction wire 11 is increased, the connecting plate 17 drives the barrel body 3 to slide downwards, the proper descending size is selected through observing the comparison of the size of the tape measure 10 and the size on the traction belt 6, and the first limiting latch 15 and the second limiting latch 12 are in limiting fit, so that the winding roller 9 and the stepped shaft 14 are avoided.
The distance between the first connecting pipe 1 and the second connecting pipe 2 can be controlled through the second distance measuring mechanism, so that the length of the telescopic barrel handle is adjusted, the telescopic barrel handle is suitable for liquid nitrogen tanks with different liquid level heights, the winding roller 9 is used for controlling the descending height of the barrel body 3, meanwhile, the descending height is observed through the tape measure 10 on the winding roller 9, the distance between the barrel body 3 and the floating plate 4 is determined through comparison with the numerical value of the scale mark on the traction belt 6, the distance between the barrel body 3 and the liquid level is further determined, the temperature value of the current distance is measured through the temperature sensor 16, and the accuracy of an experiment is guaranteed.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (5)
1. An experimental device for accurately cooling by using a liquid nitrogen tank comprises the liquid nitrogen tank and is characterized in that a dividing ring (13) is fixedly connected to the top of the liquid nitrogen tank, a plurality of mounting grooves are formed in the inner wall of the dividing ring (13) in the circumferential direction at equal intervals, a plurality of lifting barrels are mounted in the mounting grooves, each lifting barrel comprises a telescopic barrel handle and a barrel body (3) connected to the corresponding telescopic barrel handle in a sliding mode, a floating plate (4) is fixedly connected to the bottom end of the telescopic barrel handle, the barrel body (3) is located above the corresponding floating plate (4), a temperature sensor (16) is fixedly connected to the bottom surface of the barrel body (3), a first distance measuring mechanism and a second distance measuring mechanism are arranged on the telescopic barrel handle, the first distance measuring mechanism corresponds to the barrel body (3), and the second distance measuring mechanism corresponds to the floating plate (4);
the telescopic bucket handle comprises a first connecting pipe (1) and a second connecting pipe (2), the inner wall of the first connecting pipe (1) is connected with the outer wall of the second connecting pipe (2) in a sliding manner, and the floating plate (4) is fixedly connected to the bottom end of the second connecting pipe (2);
the first distance measuring mechanism comprises a rotating shaft (5) which is rotatably connected to the top end of the first connecting pipe (1); a winding wheel (7) is fixedly connected to the rotating shaft (5), the winding wheel (7) is located inside the first connecting pipe (1), one end of a traction belt (6) is fixedly connected to the winding wheel (7), the other end of the traction belt (6) is fixedly connected with the top surface of the floating plate (4), and scale marks are arranged on one side of the traction belt (6);
the second distance measuring mechanism comprises a winding roller (9) which is rotatably connected in the first connecting pipe (1), the winding roller (9) is arranged in parallel with the rotating shaft (5), one end of a tape measure (10) is fixedly wound on the winding roller (9), a stepped shaft (14) is rotatably connected in the first connecting pipe (1), the winding roller (9) is in transmission fit with the stepped shaft (14), the stepped shaft (14) is positioned below the winding roller (9), the other end of the tape measure (10) is fixedly connected with the middle of the stepped shaft (14), one side of the telescopic barrel handle is slidably connected with a connecting part, and the barrel body (3) is fixedly connected with one side of the connecting part, which is far away from the barrel handle; the top end of the connecting part is fixedly connected with one end of a traction wire (11), and the other end of the traction wire (11) is fixedly wound on the stepped shaft (14).
2. The experimental device for accurately reducing the temperature by using the liquid nitrogen tank as claimed in claim 1, wherein: limiting parts are arranged on the winding roller (9) and the rotating shaft (5); spacing portion includes the telescopic link, two telescopic link one end respectively with wind-up roll (9) rotation axis (5) fixed connection, the first spacing latch (15) of telescopic link outer wall fixedly connected with, the telescopic link is kept away from the one end of first even pipe (1) runs through first spacing latch (15) and the spacing latch (12) of fixedly connected with second, first spacing latch (15) with the spacing cooperation of the spacing latch (12) of second, keep away from the spacing latch (12) of second one side fixedly connected with adjust knob (8) of telescopic link.
3. The experimental device for accurately reducing the temperature by using the liquid nitrogen tank as claimed in claim 2, wherein: connecting portion include with connecting plate (17) of first even pipe (1), the even pipe of second (2) slip joint, connecting plate (17) are close to the mounting groove has all been seted up to the both sides of flexible bucket handle, fixedly connected with spring (18) one end in the mounting groove, spring (18) other end fixedly connected with mount pad (19), mount pad (19) sliding connection be in the mounting groove, mount pad (19) are kept away from one side of spring (18) is rotated and is connected with ball (20), first even pipe (1), the even pipe of second (2) are close to the spout has been seted up to one side of connecting plate (17), the spout with ball (20) match.
4. The experimental device for accurately reducing the temperature by using the liquid nitrogen tank as claimed in claim 1, wherein: the number of the mounting grooves is 2-8.
5. The use method of the experimental device for accurately reducing the temperature by using the liquid nitrogen tank according to any one of claims 1 to 4 is characterized in that: the method comprises the following steps:
1) putting the lifting barrel into a liquid nitrogen tank, and adjusting the length of the telescopic barrel handle by using a first distance measuring mechanism until the floating plate (4) is contacted with the liquid level;
2) the distance between the barrel body (3) and the floating plate (4) is adjusted by utilizing a second distance measuring mechanism
3) Determining the current height temperature value by observing the temperature signal transmitted by the temperature sensor (16);
4) and (5) sealing and storing the liquid nitrogen tank.
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