A liquid nitrogen tank

Abstract

The application discloses a liquid nitrogen tank, comprising a liquid nitrogen tank body, further comprising: a storage unit; an adjusting unit, comprising a main adjusting component rotatably arranged in the interior of the liquid nitrogen tank body for driving the whole rotation of the storage unit away from the tank opening, and a secondary adjusting component arranged in the interior of the main adjusting component for driving the local rotation of the storage unit close to the tank opening. When the sample is taken out from the liquid nitrogen tank body, if the storage unit corresponding to the target sample is away from the tank opening, the main adjusting component is first rotated, so that the main adjusting component moves the storage unit corresponding to the sample to the tank opening; if the storage unit corresponding to the sample is located directly below the tank opening, the sample is directly pulled out through the tank opening; if the storage unit corresponding to the sample is offset from the position directly below the tank opening, the secondary adjusting component is rotated, so that the storage unit corresponding to the sample is moved to the position directly below the tank opening, and the remaining storage units remain unchanged, so that the samples in all the storage units are prevented from being disordered in the repeated adjustment process.

Description

Technical Field

[0001] This invention relates to the field of liquid nitrogen tank sampling technology, specifically to a liquid nitrogen tank. Background Technology

[0002] Liquid nitrogen tanks are containers commonly used for cryogenic storage of biological samples, cells, tissues, and certain special materials. They maintain the activity and stability of the stored items through the cryogenic environment of liquid nitrogen. However, liquid nitrogen tanks present many inconveniences in sampling during actual use.

[0003] In existing liquid nitrogen tank designs, the internal structure is quite complex. Numerous sample storage racks and compartments are often submerged in liquid nitrogen. When a specific sample needs to be retrieved, it is usually necessary to rotate the shaft used to move the storage rack to the opening of the liquid nitrogen tank, and then remove the storage rack from the tank. During this process, due to the liquid nitrogen covering the storage racks, it is difficult to accurately locate the target sample. In addition, the existing storage racks and shafts are fixedly connected, which means that when retrieving a sample close to the opening of the liquid nitrogen tank, all the storage racks inside the tank need to be rotated and adjusted. Because the opening of the liquid nitrogen tank is small, during the process of rotating and removing the storage rack, the angle of rotation of the required storage rack is often too large or too small, causing the storage rack to deviate from the bottom of the tank opening. In order to successfully remove the storage rack from the tank opening, it is necessary to repeatedly switch the rotation direction of the shaft to fine-tune the position of the storage rack. The operation process is complicated, and repeatedly switching the rotation direction of the shaft will further confuse the samples in all the storage racks.

[0004] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is the closest prior art. Summary of the Invention

[0005] The purpose of this invention is to provide a liquid nitrogen tank to solve the problems mentioned in the background art regarding the sample removal process of liquid nitrogen tanks. Due to the liquid nitrogen covering the storage rack, it is difficult to accurately locate the target sample. Furthermore, when removing the storage rack from the opening of the liquid nitrogen tank, the rotation direction of the entire storage rack needs to be repeatedly switched, causing the samples in all the storage racks to become disordered.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A liquid nitrogen tank, comprising a liquid nitrogen tank body, and further comprising:

[0008] The storage unit, located inside the liquid nitrogen tank, is used to store samples.

[0009] The adjustment unit includes a main adjustment component rotatably disposed inside the liquid nitrogen tank body for driving the storage unit away from the tank opening to rotate as a whole, and a secondary adjustment component disposed inside the main adjustment component for driving the storage unit near the tank opening to rotate locally.

[0010] Furthermore, the main control component includes:

[0011] The main rotating shaft is rotatably connected inside the liquid nitrogen tank body and is coaxial with the liquid nitrogen tank body;

[0012] The main rotating rod is fixedly connected to the upper end of the main rotating shaft and is used for adjusting the rotation of the main rotating shaft;

[0013] The clamping mechanism, located at the upper end of the liquid nitrogen tank body, is used to clamp the main rotating shaft.

[0014] Furthermore, the clamping mechanism includes:

[0015] A fixing block is fixedly connected to the upper end of the liquid nitrogen tank body, and a retraction groove is provided on the upper end of the fixing block;

[0016] The slider is slidably inserted into the retraction groove;

[0017] A retaining shaft is fixedly connected to one end of the slider, and a hole for guiding the movement of the retaining shaft is provided inside the fixing block and outside the retaining shaft.

[0018] The insertion holes are set at equal angles on the outside of the main rotating shaft, and are used to cooperate with the retaining shaft to lock the main rotating shaft.

[0019] Furthermore, the secondary adjustment component includes:

[0020] The secondary rotating shafts are provided in multiple sets and rotatably connected inside the main rotating shaft, and each secondary rotating shaft corresponds to a storage unit.

[0021] The secondary rotating rod is fixedly connected to the upper end of the secondary rotating shaft and is used for adjusting the rotation of the secondary rotating shaft;

[0022] The gear is fixedly connected to the lower end of the secondary shaft and located inside the main shaft.

[0023] The arc-shaped rack is provided in multiple sets and slidably disposed inside the main rotating shaft. The toothed side of the arc-shaped rack meshes with the gear. The main rotating shaft is provided with guide grooves for accommodating the arc-shaped rack and the gear.

[0024] A limiting mechanism is located on the outside of the main rotating shaft to limit the rotation of the arc-shaped rack;

[0025] An extension rod is fixedly connected to the side of the arc-shaped rack opposite the gear;

[0026] The upright is fixedly connected to one end of the extension rod opposite the arc-shaped rack, and is used to limit the position of the storage unit.

[0027] Furthermore, the limiting mechanism includes:

[0028] The support ring is fixedly sleeved on the outside of the main rotating shaft and located below the extension rod;

[0029] Multiple sets of arc-shaped grooves are provided inside the support ring. Each arc-shaped groove corresponds to one of the extension rods. A guide shaft is fixedly connected to the lower end of the extension rod. The guide shaft extends into the arc-shaped groove and is used to limit the movement of the arc-shaped rack in conjunction with the guide groove.

[0030] A limiting ring is fixedly sleeved on the outside of the main rotating shaft and located at the upper end of the support ring. The horizontal plane where the upper end of the limiting ring is located is higher than the horizontal plane where the lower end of the arc rack is located. It is used to limit and guide the side of the arc rack relative to the gear. The curvature of the limiting ring is adapted to the curvature of the arc rack.

[0031] Furthermore, the storage unit includes:

[0032] A lifting block, wherein one side of the lifting block is provided with multiple sets of storage slots at equal intervals from top to bottom for storing samples;

[0033] A retaining sleeve is fixedly connected to one side of the lifting block, and the retaining sleeve is slidably fitted onto the outside of the upright;

[0034] The lifting block is fixedly connected to the upper end of the lifting block and is used to pick up the lifting block.

[0035] Furthermore, the height of the upper end of the lifting block is close to the height of the tank opening;

[0036] The height of the upper end of the upright is close to the height of the tank opening.

[0037] Furthermore, the upper end of the main rotating shaft is provided with multiple sets of first marking blocks, each of which corresponds to a lifting block and is used to number the corresponding lifting blocks.

[0038] The lifting block has a second marking block on one side that corresponds to a storage slot, used to mark the types of samples in the storage slot.

[0039] Compared with the prior art, the beneficial effects of the present invention are:

[0040] 1. In this invention, when a sample is removed from the liquid nitrogen tank, if the storage unit corresponding to the target sample is far from the tank opening, the main adjustment component is rotated first to move the storage unit corresponding to the sample to the tank opening. If the storage unit corresponding to the sample is directly below the tank opening, it is pulled out directly through the tank opening. If the storage unit corresponding to the sample is offset from directly below the tank opening, the secondary adjustment component is rotated to move the storage unit corresponding to the sample to directly below the tank opening, while the remaining storage units remain stationary. This avoids confusion of the samples in all storage units during repeated adjustments. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0042] Figure 2 This is a schematic diagram of the internal structure of the liquid nitrogen tank body of the present invention;

[0043] Figure 3 This is a schematic diagram of the clamping mechanism of the present invention;

[0044] Figure 4 This is a schematic diagram of the storage unit structure of the present invention;

[0045] Figure 5 This is a schematic diagram of the main regulating component structure of the present invention;

[0046] Figure 6 For the present invention in Figure 5 Enlarged view of point A in the middle;

[0047] Figure 7 This is a schematic diagram of the process of removing the storage unit of the present invention from the can opening.

[0048] Reference numerals: 100, Liquid nitrogen tank body; 1001, Tank opening; 1002, Limiting groove; 101, Tank cover; 1, Adjustment unit; 11, Main adjustment assembly; 111, Main rotating shaft; 1111, Insertion hole; 1112, Guide groove; 1113, Limiting plate; 1114, Receiving hole; 112, Main rotating rod; 113, Clamping mechanism; 1131, Fixing block; 1132, Retraction groove; 1133, Sliding block; 1134, Clamping shaft; 114 1. First marking block; 12. Secondary adjustment component; 121. Secondary rotating shaft; 122. Secondary rotating rod; 123. Gear; 124. Limiting mechanism; 1241. Support ring; 1242. Arc groove; 1243. Limiting ring; 125. Arc rack; 126. Extension rod; 1261. Guide shaft; 127. Vertical pole; 2. Storage unit; 21. Lifting block; 22. Storage slot; 23. Sleeve; 24. Lifting block; 25. Second marking block. Detailed Implementation

[0049] 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.

[0050] Please see Figure 1-7 The present invention provides a technical solution:

[0051] A liquid nitrogen tank, including a liquid nitrogen tank body 100, and further comprising:

[0052] Storage unit 2, located inside the liquid nitrogen tank body 100, is used to store samples;

[0053] The adjustment unit 1 includes a main adjustment component 11 rotatably disposed inside the liquid nitrogen tank body 100 for driving the storage unit 2, which is far away from the tank opening 1001, to rotate as a whole, and a secondary adjustment component 12 disposed inside the main adjustment component 11 for driving the storage unit 2, which is close to the tank opening 1001, to rotate partially.

[0054] It should be noted that when a sample needs to be removed from the liquid nitrogen tank body 100, if the storage unit 2 corresponding to the target sample is far from the tank opening 1001, the main adjustment component 11 is rotated first to move the storage unit 2 corresponding to the sample to the tank opening 1001. If the storage unit 2 corresponding to the sample is directly below the tank opening 1001, it is pulled out directly through the tank opening 1001. If the storage unit 2 corresponding to the sample is offset from directly below the tank opening 1001, the secondary adjustment component 12 is rotated to move the storage unit 2 corresponding to the sample to directly below the tank opening 1001, while the remaining storage units 2 remain stationary to avoid confusion of the samples in all storage units 2 during repeated adjustments.

[0055] As an improvement, such as Figure 1-3 As shown, the main control component 11 includes:

[0056] The main rotating shaft 111 is rotatably connected inside the liquid nitrogen tank body 100 and is coaxial with the liquid nitrogen tank body 100;

[0057] The main rotating rod 112 is fixedly connected to the upper end of the main rotating shaft 111 and is used to adjust the rotation of the main rotating shaft 111.

[0058] The clamping mechanism 113 is located at the upper end of the liquid nitrogen tank body 100 and is used to clamp the main rotating shaft 111.

[0059] Furthermore, such as Figure 3 As shown, the clamping mechanism 113 includes:

[0060] A fixing block 1131 is fixedly connected to the upper end of the liquid nitrogen tank body 100, and a retraction groove 1132 is provided on the upper end of the fixing block 1131.

[0061] The slider 1133 is slidably inserted into the retraction groove 1132;

[0062] A retaining shaft 1134 is fixedly connected to one end of the slider 1133. The fixing block 1131 has a hole inside and outside the retaining shaft 1134 for guiding the movement of the retaining shaft 1134.

[0063] The insertion hole 1111 is set at an equal angle on the outside of the main rotating shaft 111, and is used to cooperate with the locking shaft 1134 to lock the main rotating shaft 111.

[0064] The lower end of the main rotating shaft 111 is fixedly connected to a limiting disk 1113. The diameter of the limiting disk 1113 is larger than the diameter of the main rotating shaft 111, and it is used to limit the main rotating shaft 111. The limiting disk 1113 is rotatably connected to the bottom of the liquid nitrogen tank body 100. The liquid nitrogen tank body 100 is provided with a limiting groove 1002 for accommodating the limiting disk 1113 inside the limiting disk 1113 and outside the limiting disk 1113.

[0065] As an improvement, such as Figure 5-6 As shown, the secondary adjustment component 12 includes:

[0066] The secondary rotating shaft 121 is provided in multiple sets and rotatably connected inside the main rotating shaft 111, and the secondary rotating shaft 121 corresponds one-to-one with the storage unit 2;

[0067] The main rotating shaft 111 is provided with a receiving hole 1114 inside and outside the secondary rotating shaft 121 for accommodating the secondary rotating shaft 121.

[0068] The secondary rotating rod 122 is fixedly connected to the upper end of the secondary rotating shaft 121 and is used for rotational adjustment of the secondary rotating shaft 121;

[0069] Gear 123 is fixedly connected to the lower end of the secondary rotating shaft 121 and located inside the main rotating shaft 111;

[0070] The arc-shaped rack 125 is provided in multiple sets and slidably disposed inside the main rotating shaft 111. The toothed side of the arc-shaped rack 125 meshes with the gear 123. The main rotating shaft 111 is provided with a guide groove 1112 for accommodating the arc-shaped rack 125 and the gear 123.

[0071] The limiting mechanism 124 is located on the outside of the main rotating shaft 111 and is used to limit the rotation of the arc-shaped rack 125.

[0072] The extension rod 126 is fixedly connected to the side of the arc-shaped rack 125 opposite to the gear 123;

[0073] The upright 127 is fixedly connected to one end of the extension rod 126 opposite to the arc-shaped rack 125, and is used to limit the position of the storage unit 2.

[0074] Furthermore, such as Figure 5-6 As shown, the limiting mechanism 124 includes:

[0075] The support ring 1241 is fixedly sleeved on the outside of the main rotating shaft 111 and located below the extension rod 126;

[0076] Multiple sets of arc-shaped grooves 1242 are provided inside the support ring 1241. Each arc-shaped groove 1242 corresponds to one of the extension rods 126. The lower end of the extension rod 126 is fixedly connected to a guide shaft 1261. The guide shaft 1261 extends into the arc-shaped groove 1242 and is used to limit the movement of the arc-shaped rack 125 in conjunction with the guide groove 1112.

[0077] A limiting ring 1243 is fixedly sleeved on the outside of the main rotating shaft 111 and located at the upper end of the support ring 1241. The horizontal plane where the upper end of the limiting ring 1243 is located is higher than the horizontal plane where the lower end of the arc rack 125 is located. It is used to limit and guide the side of the arc rack 125 relative to the gear 123. The curvature of the limiting ring 1243 is adapted to the curvature of the arc rack 125.

[0078] Furthermore, such as Figure 4 , Figure 7 As shown, the storage unit 2 includes:

[0079] The lifting block 21 has multiple sets of storage slots 22 spaced equally from top to bottom on one side for storing samples;

[0080] The sleeve 23 is fixedly connected to one side of the lifting block 21, and the sleeve 23 is slidably sleeved on the outside of the upright 127.

[0081] Lifting block 24 is fixedly connected to the upper end of lifting block 21 and is used to pick up lifting block 21;

[0082] It should be added that the storage slot 22 can be used to directly place samples into the storage slot, or a drawer containing samples can be inserted into the storage slot 22.

[0083] Among them, such as Figure 2 , Figure 7 As shown, the height of the upper end of the lifting block 24 is close to the height of the tank opening 1001;

[0084] The height of the upper end of the upright 127 is close to the height of the can opening 1001;

[0085] The can opening 1001 is fitted with a can cover 101 for sealing the inside of the liquid nitrogen tank body 100.

[0086] In addition, the upper end of the main rotating shaft 111 is provided with multiple sets of first marking blocks 114, and the first marking blocks 114 correspond one-to-one with the lifting blocks 21, which are used to number the corresponding lifting blocks 21.

[0087] The lifting block 21 has a second marking block 25 on one side that corresponds to the storage slot 22, which is used to mark the sample types in the storage slot 22.

[0088] It should be noted that, as Figure 2 , Figure 4 , Figure 7 As shown, the first marker block 114 in this invention is marked with Arabic numerals, and a query catalog is affixed to the upper end of the liquid nitrogen tank body 100. The query catalog records the type of sample stored in the lifting block 21 corresponding to each first marker block 114, and also records the name of the sample corresponding to the second marker block 25 on one side of each storage slot 22 in each lifting block 21. When the sample is taken out from the liquid nitrogen tank body 100, the type of the sample is first searched in the query catalog to determine the Arabic numeral label corresponding to the specific first marker block where the sample is located, and then the layer number of the corresponding second marker block 25 is found through the Arabic numeral label. In this way, the target sample can be quickly found and taken out directly from the liquid nitrogen tank body 100.

[0089] It should be noted that: in the specific implementation process of this invention, such as Figure 2-4 As shown, initially, one end of the locking shaft 1134 is inserted into the socket 1111, so that the main rotating shaft 111 is locked. When it is necessary to remove the target sample from the liquid nitrogen tank body 100, the first marker block 114 and the second marker block 25 corresponding to the target sample are found respectively.

[0090] like Figure 2-4As shown, if the lifting block 21 where the target sample is located is far away from the tank opening 1001, the slider 1133 is pulled to move along the retraction groove 1132, causing the locking shaft 1134 to disengage from the insertion hole 1111. The main rotating rod 112 is rotated, and the main rotating rod 112 drives all the extension rods 126 to rotate synchronously through the main rotating shaft 111. The extension rods 126 drive the lifting block 21 to rotate directly below the opening of the tank opening 1001 through the upright rod 127. During this process, the position of the first marker block 114 corresponding to the lifting block 21 used to store the target sample relative to the tank opening 1001 is observed to determine the position of the lifting block 21 inside the liquid nitrogen tank body 100 relative to the tank opening. At position 1001, open the canister lid 101 and pull the lifting block 24 upwards by hand. The lifting block 24 drives the sleeve 23 to move upwards along the upright 127 via the lifting block 21, so that the storage tank 22 containing the target sample is brought out from the canister opening 1001. At this time, check the second marker block 25 to determine the storage tank 22 where the target sample is located. Then, take the target sample out of the storage tank 22 and lower the lifting block 24 into the liquid nitrogen tank body 100. Cover the canister lid 101, thereby overcoming the liquid nitrogen covering the storage tank 22 and enabling the target sample to be quickly and accurately taken out of the liquid nitrogen tank body 100.

[0091] like Figure 5-7 As shown, if the lifting block 21 where the target sample is located is close to the bottom of the can opening 1001 at the beginning, or if the lifting block 21 is offset from the bottom of the can opening 1001 during the process of rotating to the main rotating shaft 111, the locking shaft 1134 is inserted into the insertion hole 1111, so that the main rotating shaft 111 is positioned, and the secondary rotating rod 122 corresponding to the can opening 1001 is rotated. The secondary rotating rod 122 drives the gear 123 to rotate through the secondary rotating shaft 121. The gear 123 drives the arc rack 125 to rotate along the limiting ring 1243. The arc rack 125 rotates through the extension... The extension rod 126 drives the upright rod 127 to rotate. The upright rod 127 drives the lifting block 21 to be finely adjusted to be directly below the can opening 1001 through the clamp 23. Then the lifting block 21 is removed from the can opening 1001. Thus, only the lifting block 21 near the can opening 1001 needs to be adjusted individually. There is no need to switch the rotation direction of all lifting blocks 21 through the main rotating shaft 111. This avoids the samples in the storage slots 22 corresponding to all lifting blocks 21 from shifting or becoming disordered due to the inertia of the samples themselves when rotating and adjusting.

[0092] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0093] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A liquid nitrogen tank, comprising a liquid nitrogen tank body (100), characterized in that, Also includes: Storage unit (2), located inside the liquid nitrogen tank body (100), is used to store samples; The adjustment unit (1) includes a main adjustment component (11) which is rotatably disposed inside the liquid nitrogen tank body (100) to drive the storage unit (2) far away from the tank opening (1001) to rotate as a whole, and a secondary adjustment component (12) disposed inside the main adjustment component (11) to drive the storage unit (2) close to the tank opening (1001) to rotate locally. The main control component (11) includes: The main rotating shaft (111) is rotatably connected inside the liquid nitrogen tank body (100) and is coaxial with the liquid nitrogen tank body (100); The main rotating rod (112) is fixedly connected to the upper end of the main rotating shaft (111) and is used to adjust the rotation of the main rotating shaft (111). A clamping mechanism (113) is located at the upper end of the liquid nitrogen tank body (100) and is used to clamp the main rotating shaft (111); The secondary adjustment component (12) includes: The secondary rotating shaft (121) is provided in multiple sets and rotatably connected inside the main rotating shaft (111), and the secondary rotating shaft (121) corresponds one-to-one with the storage unit (2); The secondary rotating rod (122) is fixedly connected to the upper end of the secondary rotating shaft (121) and is used to adjust the rotation of the secondary rotating shaft (121); Gear (123) is fixedly connected to the lower end of the secondary shaft (121) and located inside the main shaft (111); The arc-shaped rack (125) is provided in multiple sets and is slidably disposed inside the main rotating shaft (111). The toothed side of the arc-shaped rack (125) meshes with the gear (123). The main rotating shaft (111) is provided with a guide groove (1112) for accommodating the arc-shaped rack (125) and the gear (123). A limiting mechanism (124) is provided on the outside of the main rotating shaft (111) to limit the rotation of the arc-shaped rack (125); An extension rod (126) is fixedly connected to one side of the arc-shaped rack (125) relative to the gear (123); The upright (127) is fixedly connected to one end of the extension rod (126) opposite the arc-shaped rack (125) and is used to limit the storage unit (2); The storage unit (2) includes: The lifting block (21) has multiple sets of storage slots (22) spaced evenly from top to bottom on one side for storing samples; A sleeve (23) is fixedly connected to one side of the lifting block (21), and the sleeve (23) is slidably fitted onto the outside of the upright (127); The lifting block (24) is fixedly connected to the upper end of the lifting block (21) and is used to pick up the lifting block (21).

2. A liquid nitrogen tank according to claim 1, characterized in that: The clamping mechanism (113) includes: A fixing block (1131) is fixedly connected to the upper end of the liquid nitrogen tank body (100), and a retraction groove (1132) is provided on the upper end of the fixing block (1131); The slider (1133) is slidably inserted into the recess (1132); A retaining shaft (1134) is fixedly connected to one end of the slider (1133). The fixing block (1131) has a hole inside and outside the retaining shaft (1134) for guiding the movement of the retaining shaft (1134). The insertion hole (1111) is set at an equal angle on the outside of the main rotating shaft (111) and is used to cooperate with the locking shaft (1134) to lock the main rotating shaft (111).

3. A liquid nitrogen tank according to claim 1, characterized in that: The limiting mechanism (124) includes: The support ring (1241) is fixedly sleeved on the outside of the main rotating shaft (111) and located below the extension rod (126); Multiple sets of arc-shaped grooves (1242) are provided inside the support ring (1241). The arc-shaped grooves (1242) correspond one-to-one with the extension rods (126). The lower end of the extension rods (126) is fixedly connected to a guide shaft (1261). The guide shaft (1261) extends into the arc-shaped grooves (1242) and is used to limit the movement of the arc-shaped rack (125) in conjunction with the guide groove (1112). A limiting ring (1243) is fixedly sleeved on the outside of the main rotating shaft (111) and located at the upper end of the support ring (1241). The horizontal plane at the upper end of the limiting ring (1243) is higher than the horizontal plane at the lower end of the arc rack (125). It is used to limit and guide the arc rack (125) relative to the gear (123) on one side. The curvature of the limiting ring (1243) is adapted to the curvature of the arc rack (125).

4. A liquid nitrogen tank according to claim 1, characterized in that: The height of the upper end of the lifting block (24) is close to the height of the tank opening (1001); The height of the upper end of the upright (127) is close to the height of the can opening (1001).

5. A liquid nitrogen tank according to claim 4, characterized in that: The upper end of the main rotating shaft (111) is provided with multiple sets of first marking blocks (114), and the first marking blocks (114) correspond one-to-one with the lifting blocks (21) to mark the corresponding lifting blocks (21) with numbers; The lifting block (21) has a second marking block (25) on one side that corresponds to the storage slot (22) and is used to mark the sample types in the storage slot (22).

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