Automatic liquid nitrogen storage equipment

Abstract

The utility model relates to the technical field of liquid nitrogen storage, in particular to automatic liquid nitrogen storage equipment. Comprising a material storing and taking part used for placing to-be-stored or to-be-taken samples; the storage mechanism is used for storing samples and automatically extracting or storing cryopreservation frames for storing the samples according to the storage and taking requirements of the samples; the automatic storing and taking mechanism is used for taking out the samples on the cryopreservation frame and conveying the samples to the material storing and taking part or conveying the to-be-stored samples at the material storing and taking part into the cryopreservation frame of the storage mechanism according to the storing and taking requirements of the samples; and the control part is used for controlling the material access part, the storage mechanism and the automatic access mechanism to carry out an automatic access procedure on the samples according to access requirements of the samples, and providing a low-temperature, dry and clean access space for the samples in the access process.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid nitrogen storage, and particularly relates to an automated liquid nitrogen storage device. Background Art

[0002] At present, the temperature inside a well-known liquid nitrogen tank is -196°C, and a freezing rack is provided inside for easy access to samples. The samples are stored in freezing boxes or straws and placed in the freezing rack for freezing. When a sample needs to be taken out, the operator needs to wear special liquid nitrogen gloves and manually identify multiple freezing racks inside the liquid nitrogen tank and then lift the freezing rack to select the desired sample. When a single freezing rack is fully loaded, it can weigh nearly 10 kilograms, and liquid nitrogen has a low temperature and the property of expelling air. There are problems with the liquid nitrogen tanks on the market such as difficult manual access and placement, inaccurate sample searching, and an easy risk of asphyxiation for operators. For some automated liquid nitrogen tank products, the full-process humidity control effect is not ideal, resulting in high mechanical failure rates and high liquid nitrogen consumption rates for automated liquid nitrogen tank products. Therefore, there is an urgent need to solve these problems.

[0003] The above content is only used to assist in understanding the technical solution of the utility model and does not represent an admission that the above content is the closest prior art. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide an automated liquid nitrogen storage device, which not only solves the problem of difficult manual selection of traditional liquid nitrogen storage devices, but also has a high degree of automation, stable operation, and improves the efficiency of sample access and storage.

[0005] To achieve the above object, the technical solution of the utility model is realized as follows: an automated liquid nitrogen storage device, comprising: an installation platform, a material access and storage part for placing samples, a storage mechanism for storing samples, and an automatic access mechanism for transferring and selecting samples between the material access and storage part and the storage mechanism; the storage mechanism includes a liquid nitrogen tank, an automatic sealing component, and an automatic extraction component; a freezing rack for storing samples is provided inside the liquid nitrogen tank; the material access and storage part and the liquid nitrogen tank of the storage mechanism are installed below the installation platform; the automatic access mechanism, the automatic sealing component, and the automatic extraction component are installed above the installation platform, and a freezing rack hole is provided on the installation platform; the freezing rack hole is communicated with the entrance and exit at the top of the liquid nitrogen tank, and the automatic sealing component seals the freezing rack hole and the entrance and exit at the top of the liquid nitrogen tank simultaneously; the automatic extraction component is docked with the liquid nitrogen tank and extracts or places the freezing rack along the entrance and exit at the top of the liquid nitrogen tank.

[0006] Preferably, an annular drive and at least two mutually nested annular fixing cylinders are provided inside the liquid nitrogen tank, and fixing grooves are equidistantly distributed along the circumferential direction of the annular fixing cylinder; the cryopreservation rack and the fixing grooves form a plug-in fit; the annular drive is used to drive the annular fixing cylinder to rotate and move the corresponding cryopreservation rack to the entrance and exit of the liquid nitrogen tank according to the sample access requirements.

[0007] Preferably, the automatic sealing assembly includes a sealing cover and an opening / closing motor; the bottom of the sealing cover forms a snap connection with the entrance and exit at the top of the liquid nitrogen tank; the opening / closing motor is fixed beside the sealing cover and is connected to the top of the sealing cover through a connecting frame to drive the sealing cover to automatically open and close at the entrance and exit of the liquid nitrogen tank.

[0008] Preferably, the automatic extraction assembly includes an extraction box and a direction adjustment frame; the extraction box is a quadrangular prism, an opening for the cryopreservation rack to enter and exit is provided at the bottom of the quadrangular prism, and a side opening for the sample storage box to enter and exit is provided on one side of the quadrangular prism, and the side opening is docked with the automatic access mechanism; the direction adjustment frame is arranged above the liquid nitrogen tank and is used to drive the vertically placed extraction box to move along the horizontal plane and adjust the opening at the bottom of the quadrangular prism to be aligned with the cryopreservation rack at the entrance and exit of the nitrogen tank in the vertical direction; a vertical drive is provided at the top of the extraction box, a claw is provided inside the extraction box, the vertical drive passes through the top of the extraction box and is connected to the top of the claw, and drives the claw to move up and down along the vertical direction inside the extraction box; the bottom of the claw forms a snap connection with the top of the cryopreservation rack.

[0009] Preferably, the automatic access mechanism includes a box selection and tube picking assembly, a tube picking platform, and a box picking assembly; a liquid nitrogen tank for placing the sample storage box is provided on the tube picking platform, and two sample storage boxes can be placed in the liquid nitrogen tank; the box picking assembly is used to put the sample storage box into the cryopreservation rack or take it out from the cryopreservation rack; the box selection and tube picking assembly transfers the sample storage box at the material access part or the box picking assembly to the liquid nitrogen tank according to the sample access requirements and selects the samples in the sample storage box.

[0010] Preferably, the box picking assembly includes two groups of parallelly arranged trays and a horizontal drive; one end of the tray is used to support the bottom of the sample storage box on the cryopreservation rack; the horizontal drive is connected to the other end of the tray and drives the tray to reciprocate along the horizontal direction.

[0011] Preferably, the box selection and tube picking assembly includes a first manipulator and a second manipulator; the first manipulator is used to pick the sample storage box in the tray and the liquid nitrogen tank and select the test tubes containing samples in the sample storage box; the second manipulator is used to pick the sample storage box in the liquid nitrogen tank and the material access part.

[0012] Preferably, a sample box hole is provided on the installation platform; the material access and storage part includes a lifting drive and a horizontal sample placing plate; the horizontal sample placing plate is located directly below the sample box hole, and the sample storage box is placed on the horizontal sample placing plate; the lifting drive is connected to the bottom of the horizontal sample placing plate, driving the horizontal sample placing plate to reciprocate in the vertical direction, driving the sample storage box on the horizontal sample placing plate to pass through the sample box hole, and the horizontal sample placing plate seals the lower end of the sample box hole; a seal is provided at the upper end of the sample box hole, and the seal automatically opens and closes according to the access requirements of the sample.

[0013] Preferably, it further includes a transparent sealing cover; the transparent sealing cover covers the installation platform, and a partition plate is provided inside the transparent sealing cover, dividing the installation platform into a storage area and an operation area; the automatic access mechanism and the seal are both located in the operation area; the automatic sealing assembly and the automatic extraction assembly are both located in the storage area; a transfer door communicating the storage area and the operation area is provided on the partition plate, and the transfer door is electrically connected to the computer and automatically opens and closes according to the sampling requirements.

[0014] Preferably, it further includes a humidity sensor, a dehumidifier and a visual recognition sensor; the humidity sensor and the dehumidifier are both installed in the transparent sealing cover, automatically detecting the humidity inside the transparent sealing cover and automatically dehumidifying; the visual recognition sensor includes a first recognition camera and a second recognition camera; the first recognition camera is arranged in the extraction box, automatically verifying the position of the sample storage box on the cryopreservation rack according to the access requirements of the sample; the second recognition camera is arranged on one side of the liquid nitrogen tank, automatically verifying the sample information clamped by the first manipulator according to the access requirements of the sample.

[0015] The beneficial effects of the utility model are reflected in:

[0016] (1) The equipment provided by the utility model solves the problem of difficult manual selection of traditional liquid nitrogen storage equipment, realizes the functions of automatic transfer, automatic selection and long-term stable storage in the case of large-scale samples, has the characteristics of small floor area, high storage density, high automation degree, safety and reliability, and can expand various environments for automatic storage on this basis, such as -80°C automatic access, etc., and can be migrated to other products to realize the function of automatic management.

[0017] (2) The equipment provided by the present utility model adopts an up-and-down separated structural design, and separately forms enclosed spaces for the operation area and the storage area. It can start internal dehumidification according to the internal environment and action process to eliminate water molecules in the transparent sealing cover, and avoid automation failures caused by water vapor condensation. The operation area adopts a robotic structure to achieve fully automated operations such as transfer, tube picking, and code scanning, greatly improving reliability and the degree of equipment integration. The tube picking area uses liquid nitrogen for pre-cooling and cold preservation to ensure stable and reliable temperature of the samples during tube picking. The liquid nitrogen tank in the storage area automatically opens the lid and rotates automatically, cooperating with extraction to improve the access efficiency. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the utility model;

[0019] Figure 2 is a schematic structural diagram of the utility model;

[0020] Figure 3 is an axonometric view of the upper structure of the installation platform of the utility model;

[0021] Figure 4 is a side view of the upper structure of the installation platform of the utility model;

[0022] Figure 5 is a schematic structural diagram of the liquid nitrogen tank of the utility model.

[0023] Description of the Reference Numerals in the Drawings:

[0024] 10, Material Access Unit; 11, Sample Box Hole; 20, Sealing Member; 21, Sealing Cover Plate;

[0025] 22, Tipping Motor; 30, Box Picking and Tube Picking Assembly; 31, First Manipulator; 311, Test Tube Claw;

[0026] 32, Second Manipulator; 40, Tube Picking Platform; 41, Liquid Nitrogen Tank; 42, Second Identification Camera;

[0027] 50, Box Picking Assembly; 51, Tray; 52, Horizontal Drive; 60, Transfer Door; 61, Door Panel;

[0028] 62, Transfer Door Vertical Drive; 70, Automatic Sealing Assembly; 71, Lid Opening Motor;

[0029] 72, Auxiliary Motor; 80, Extraction Assembly; 81, Extraction Box; 811, Claw;

[0030] 82, Direction Adjustment Frame; 90, Liquid Nitrogen Tank; 91, Freezing Storage Rack; 92, Ring Drive. Detailed Embodiment

[0031] Next, the technical solutions in the embodiments of the utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the utility model without creative efforts belong to the scope of protection of the utility model.

[0032] Embodiment

[0033] See Figures 1-5 as shown in:

[0034] The utility model provides an automated liquid nitrogen storage device, including:

[0035] A material access part 10 for placing samples to be stored or retrieved;

[0036] A storage mechanism for storing samples and automatically extracting or receiving the cryogenic storage rack 91 storing samples according to the access requirements of the samples.

[0037] An automatic access mechanism for taking out the samples on the cryogenic storage rack 91 and transporting them to the material access part 10 according to the access requirements of the samples, or transporting the samples to be stored at the material access part 10 into the cryogenic storage rack 91 of the storage mechanism

[0038] A control part for controlling the material access part 10, the storage mechanism and the automatic access mechanism to perform automatic access procedures on the samples according to the access requirements of the samples, and providing a low-temperature, dry and clean access space for the samples in the access process.

[0039] The control part includes a computer, a transparent sealing cover, a humidity sensor, a dehumidifier and a visual recognition sensor; the computer is electrically connected to the material access part 10, the storage mechanism, the automatic access mechanism, the humidity sensor, the dehumidifier and the visual recognition sensor, and controls the storage mechanism, the automatic access mechanism, the humidity sensor, the dehumidifier and the visual recognition sensor to work according to the sample access requirements.

[0040] Through the above settings, the process of manually extracting the cryogenic storage rack 91 by humans and accessing samples in the cryogenic storage rack 91 is replaced, avoiding the close contact between the operator and the low-temperature liquid nitrogen environment, and improving the safety of sample access.

[0041] The storage mechanism mainly consists of a liquid nitrogen tank 90, an automatic sealing assembly 70, and an automatic extraction assembly 80. Inside the liquid nitrogen tank 90, there is an annular drive 92 and at least two mutually nested annular fixed cylinders. Along the circumferential direction of the annular fixed cylinder, equally spaced fixing grooves are provided, and the cryopreservation rack 91 is in plug-in fit with the fixing grooves. The automatic sealing assembly 70 is used to seal the inlet and outlet at the top of the liquid nitrogen tank 90, which can ensure that the liquid nitrogen in the liquid nitrogen tank 90 does not leak, ensuring that the low-temperature environment inside the liquid nitrogen tank 90 is not affected. The automatic sealing assembly 70 automatically opens or closes the inlet and outlet at the top of the liquid nitrogen tank 90 according to the sample access requirements. The automatic extraction assembly 80 is docked with the liquid nitrogen tank 90 and extracts the cryopreservation rack 91 or places the cryopreservation rack 91 along the inlet and outlet at the top of the liquid nitrogen tank 90 according to the sample access requirements.

[0042] Through the above design, not only can it replace manual extraction of the cryopreservation rack 91, liberate human labor, and improve the efficiency of sample access, but also optimize the internal space of the liquid nitrogen tank 90, so that more cryopreservation racks 91 can be stored, and the storage efficiency of the liquid nitrogen tank 90 for samples is improved.

[0043] The annular drive 92 mainly consists of a turntable, a drive motor, and a controller. In specific applications, the drive motor drives the turntable to rotate, and the turntable is arranged at the bottom of the annular fixed cylinder, used to drive the annular fixed cylinder to rotate slowly, and move the corresponding cryopreservation rack 91 to the inlet and outlet of the liquid nitrogen tank 90 according to the sample access requirements. The controller can control the start and stop of the drive motor, and the cryopreservation rack 91 is provided with a number and a sensor. After the number of each cryopreservation rack 91, there is information about the samples stored in the cryopreservation rack 91, which is recorded in the computer of the control unit. The sensor on each cryopreservation rack 91 can interact with the sensor arranged at the inlet and outlet at the top of the liquid nitrogen tank 90.

[0044] When the cryopreservation rack 91 required for sample access rotates to the inlet and outlet at the top of the liquid nitrogen tank 90 and is detected by the sensor at the inlet and outlet, the detected information is transmitted to the computer, and the computer controls the controller to control the drive motor to stop rotating, so that the cryopreservation rack 91 required for sample access stays at the inlet and outlet at the top of the liquid nitrogen tank 90 and no longer moves.

[0045] It also includes an installation platform; the material access unit 10 and the liquid nitrogen tank 90 of the storage mechanism are installed below the installation platform; the automatic access mechanism, the automatic sealing assembly 70, and the automatic extraction assembly 80 are installed above the installation platform, and there are cryopreservation rack holes on the installation platform.

[0046] The automatic sealing assembly 70 mainly consists of a sealing cover, an opening motor 71, and an auxiliary motor 72. The bottom of the sealing cover forms a snap connection with the entrance and exit at the top of the liquid nitrogen tank 90. The cryopreservation rack holes communicate with the entrance and exit at the top of the liquid nitrogen tank 90, and a soft sealing package is provided on the lower surface of the sealing cover. The sealing package has a large deformation ability and can simultaneously seal the cryopreservation rack holes and the entrance and exit at the top of the liquid nitrogen tank 90.

[0047] One side of the sealing cover is hinged to the mounting platform, and the hinge chain is connected to the motor shaft of the auxiliary motor 72. The opening motor 71 is fixed on the mounting platform, beside the hinged part of the sealing cover and the mounting platform, and is connected to the top of the sealing cover through a connecting frame. During specific use, the auxiliary motor 72 and the opening motor 71 jointly drive the sealing cover to automatically open and close at the entrance and exit of the top of the liquid nitrogen tank 90. By setting two motors, the stability of the opening and closing is ensured.

[0048] The vision recognition sensor includes a first recognition camera and a second recognition camera 42; the first recognition camera is arranged in the extraction box 81 and automatically checks the position of the sample storage box on the cryopreservation rack 91 according to the access requirements of the sample.

[0049] The automatic extraction assembly 80 includes an extraction box 81 and a direction adjustment frame 82. During specific use, the extraction box 81 is set as a quadrangular prism. An opening for the cryopreservation rack 91 to enter and exit is provided at the bottom of the quadrangular prism, and an access side opening for the sample storage box is provided on one side of the quadrangular prism. The side opening is docked with the automatic access mechanism.

[0050] The direction adjustment frame 82 is arranged on the mounting platform above the liquid nitrogen tank 90. The direction adjustment frame 82 mainly consists of a first bracket for adjusting the left - right movement of the extraction box 81 and two second brackets for adjusting the front - back movement of the extraction box 81. Both ends of the first bracket are slidably connected to the second brackets, and the second brackets are located on the front and back sides of the entrance and exit at the top of the liquid nitrogen tank 90. The extraction box 81 is slidably connected to the first bracket.

[0051] In practical applications, by setting a driving part controlled by a computer, the extraction box 81 is respectively pushed to slide along the first bracket, and the first bracket is pushed to slide along the length direction of the second bracket, so that the vertically placed extraction box 81 can be driven to move along the horizontal plane, and the opening at the bottom of the quadrangular prism can be controlled to be aligned with the cryopreservation rack 91 at the entrance and exit of the nitrogen tank 90 in the vertical direction. Together with the computer - controlled controller and sensors, the cryopreservation rack 91 that meets the sample access requirements is stopped at the entrance and exit of the nitrogen tank 90.

[0052] A vertical drive is provided at the top of the extraction box 81. A claw 811 is arranged inside the extraction box 81. The vertical drive passes through the top of the extraction box 81 and is connected to the top of the claw 811, driving the claw 811 to move up and down along the vertical direction inside the extraction box 81. The bottom of the claw 811 forms a snap connection with the top of the cryopreservation rack 91.

[0053] In actual use, the vertical drive at the top of the extraction box 81 can be a rotary telescopic motor or a power transmission pulley structure.

[0054] Through the above settings, the cryopreservation rack 91 that meets the sample access requirements in the nitrogen tank 90 is successfully extracted automatically. Moreover, due to the setting of the extraction box 81, the low-temperature environment of the cryopreservation rack 91 is ensured not to be affected.

[0055] The automatic access mechanism mainly consists of a box picking and selecting tube assembly 30, a tube picking platform 40, and a box picking assembly 50.

[0056] The installation platform is also provided with sample box holes 11; the material access part 10 includes a lifting drive and a horizontal sample placing plate.

[0057] The horizontal sample placing plate is located directly below the sample box holes 11, and the sample storage boxes are placed on the horizontal sample placing plate; the lifting drive is connected to the bottom of the horizontal sample placing plate, driving the horizontal sample placing plate to reciprocate vertically, and driving the sample storage boxes on the horizontal sample placing plate to pass through the sample box holes 11. Moreover, the horizontal sample placing plate seals the lower end of the sample box holes 11; a seal 20 for sealing the sample box holes 11 is provided at the upper end of the sample box holes 11, and the seal 20 automatically opens and closes according to the access requirements of the samples. The seal 20 includes a seal cover plate 21 and a flipping motor 22; the seal cover plate 21 is hinged to the installation platform on one side of the sample box holes 11, and the flipping motor 22 is arranged at the hinge and drives the seal cover plate 21 to complete the opening and closing actions on the sample box holes 11.

[0058] The transparent seal cover covers the installation platform. A partition plate is provided inside the transparent seal cover, and the partition plate divides the installation platform into a storage area and an operation area. The automatic access mechanism and the seal 20 are both located in the operation area; the automatic sealing assembly 70 and the automatic extraction assembly 80 are both located in the storage area; a transfer door 60 communicating the storage area and the operation area is provided on the partition plate, and the transfer door 60 is electrically connected to the computer and automatically opens according to the sampling requirements.

[0059] The partition plate is provided with through holes. The transfer door 60 includes a door panel 61 and a transfer door vertical drive 62. The transfer door vertical drive 62 is fixed on a fixing frame beside the through holes. The door panel 61 is attached to the partition plate and seals the through holes. Moreover, the top end of the door panel 61 is connected to the transfer door vertical drive 62. The computer controls the transfer door vertical drive 62 to drive the door panel 61 to reciprocate vertically, enabling the storage area and the operation area to be intermittently communicated.

[0060] The tube picking platform 40 is arranged on the installation platform, and a liquid nitrogen tank 41 for placing sample storage boxes is provided on the tube picking platform 40. Two sample storage boxes can be placed in the liquid nitrogen tank 41. During use, liquid nitrogen is stored in the liquid nitrogen tank 41, thus providing a low-temperature environment for the sample storage boxes.

[0061] The cassette picking component 50 is used to place the sample storage cassette into the cryogenic storage rack 91 or take it out from the cryogenic storage rack 91; the cassette picking and selecting tube component 30 transfers the sample storage cassette at the material access part 10 or the cassette picking component 50 to the liquid nitrogen tank 41 according to the access requirements of the sample, and selects the samples in the sample storage cassette.

[0062] The cassette picking component 50 includes two groups of pallets 51 arranged side by side and a horizontal drive 52. One end of the pallet 51 passes through the through hole opened by the door panel 61 to support the bottom of the sample storage cassette on the cryogenic storage rack 91. The horizontal drive 52 is connected to the other end of the pallet 51 and drives the pallet 51 to reciprocate horizontally, so as to move the sample storage cassette on the cryogenic storage rack 91 from the storage area to the operation area, or move the sample storage cassette from the operation area to the cryogenic storage rack 91 in the storage area.

[0063] The cassette picking and selecting tube component 30 includes a first manipulator 31 and a second manipulator 32. The second identification camera 42 is arranged on one side of the liquid nitrogen tank 41 to automatically verify the sample information clamped by the first manipulator 31 according to the access requirements of the sample. Sample box grippers capable of clamping the sample storage cassette are provided on both the first manipulator 31 and the second manipulator 32. A test tube gripper 311 is also separately provided on the sample box gripper of the first manipulator 31, and the test tube gripper 311 is used to clamp the test tube containing the sample in the sample storage cassette.

[0064] In actual use, the first manipulator 31 is used to clamp the sample storage cassette in the pallet 51 and the liquid nitrogen tank 41, select the samples in the sample storage cassette, and place the selected test tubes that meet the sample access requirements into an empty sample storage cassette, so that the first manipulator 31 completes the transfer and tube selection work of the sample storage cassette between the pallet 51 and the liquid nitrogen tank 41. The second manipulator 32 is used to clamp the sample storage cassette at the liquid nitrogen tank 41 and the material access part 10, so that the second manipulator 32 completes the transfer work of the sample storage cassette between the liquid nitrogen tank 41 and the material access part 10.

[0065] The humidity sensor and the dehumidifier are both installed in the transparent sealing cover to automatically detect the humidity inside the transparent sealing cover and automatically dehumidify.

[0066] It should be noted that if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, such descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, "a plurality of" means two or more. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist.

[0067] The above are only the preferred embodiments of the utility model and are not intended to limit the utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the utility model shall be included within the protection scope of the utility model.

Claims

1. An automated liquid nitrogen storage device, characterized in that: include: An installation platform, a material access portion (10) for placing samples, a storage mechanism for storing samples, and an automatic access mechanism for transferring and selecting samples between the material access portion (10) and the storage mechanism; the storage mechanism comprises a liquid nitrogen tank (90), an automatic sealing component (70) and an automatic extraction component (80); a freezing rack (91) for storing samples is provided in the liquid nitrogen tank (90); the material access portion (10) and the liquid nitrogen tank (90) of the storage mechanism are installed below the installation platform; The automatic storage and retrieval mechanism, the automatic sealing component (70) and the automatic extraction component (80) are installed above the installation platform, and the installation platform is provided with a freezing rack hole; the freezing rack hole is communicated with the entrance and exit at the top of the liquid nitrogen tank (90), and the automatic sealing component (70) seals the freezing rack hole and the entrance and exit at the top of the liquid nitrogen tank (90) at the same time; the automatic extraction component (80) is docked with the liquid nitrogen tank (90), and extracts the freezing rack (91) or puts the freezing rack (91) into the freezing rack along the entrance and exit at the top of the liquid nitrogen tank (90).

2. An automated liquid nitrogen storage device according to claim 1, characterized in that: The liquid nitrogen tank (90) is provided with an annular drive (92) and at least two mutually nested annular fixed cylinders, and fixed grooves are arranged at equal intervals along the circumferential direction of the annular fixed cylinder; the freezing rack (91) and the fixed grooves are plug-fitted; the annular drive (92) is used to drive the annular fixed cylinder to rotate, and move the corresponding freezing rack (91) to the entrance and exit of the liquid nitrogen tank (90) according to the sample access requirements.

3. An automated liquid nitrogen storage device according to claim 2, characterized in that: The automatic sealing assembly (70) comprises a sealing cover and a cover opening motor (71); the bottom of the sealing cover is connected to the inlet and outlet at the top of the liquid nitrogen tank (90) in a snap-fitting manner; the cover opening motor (71) is fixed to one side of the sealing cover and connected to the top of the sealing cover via a connecting frame, thereby driving the sealing cover to automatically open and close at the inlet and outlet at the top of the liquid nitrogen tank (90).

4. The automated liquid nitrogen storage device according to claim 3, characterized in that: The automatic extraction component (80) comprises an extraction box (81) and a direction adjustment frame (82); the extraction box (81) is configured as a quadrangular prism, the bottom of the quadrangular prism is provided with an opening for the freezing rack (91) to enter and exit, and one side of the quadrangular prism is provided with a side opening for the sample storage box to enter and exit, and the side opening is docked with the automatic storage and retrieval mechanism; the direction adjustment frame (82) is arranged above the liquid nitrogen tank (90), and is used to drive the vertically placed extraction box (81) to move along a horizontal plane, and to adjust the bottom opening of the quadrangular prism to align with the freezing rack (91) in the entrance and exit of the nitrogen tank (90) in the vertical direction; the top of the extraction box (81) is provided with a vertical drive, and a clamping claw (811) is provided inside the extraction box (81), the vertical drive passes through the top of the extraction box (81) and is connected to the top of the clamping claw (811), and drives the clamping claw (811) to be lifted and lowered along the vertical direction inside the extraction box (81); the bottom of the clamping claw (811) is clamped with the top of the freezing rack (91).

5. An automated liquid nitrogen storage device according to claim 3 or 4, characterized in that: The automatic storage and retrieval mechanism comprises a box retrieval and tube selection assembly (30), a tube selection platform (40), and a box retrieval assembly (50); a liquid nitrogen tank (41) for placing a sample storage box is provided on the tube selection platform (40), and two sample storage boxes can be placed in the liquid nitrogen tank (41); the box retrieval assembly (50) is used to place a sample storage box into a freezing rack (91) or to take it out from the freezing rack (91); the box retrieval and tube selection assembly (30) transfers the sample storage box at the material storage and retrieval portion (10) or the box retrieval assembly (50) to the liquid nitrogen tank (41) according to the storage and retrieval requirements of the sample, and selects the sample in the sample storage box.

6. The automated liquid nitrogen storage device according to claim 5, characterized in that: The box taking assembly (50) comprises two groups of supporting plates (51) arranged side by side and a horizontal drive (52); one end of the supporting plate (51) is used to support the bottom of the sample storage box on the freezing rack (91); the horizontal drive (52) is connected to the other end of the supporting plate (51) and drives the supporting plate (51) to move back and forth in the horizontal direction.

7. The automated liquid nitrogen storage device according to claim 6, characterized in that: The box-taking and tube-selecting assembly (30) comprises a first manipulator (31) and a second manipulator (32); the first manipulator (31) is used to clamp the sample storage boxes in the support plate (51) and the liquid nitrogen tank (41), and select the test tubes containing the samples in the sample storage boxes; the second manipulator (32) is used to clamp the sample storage boxes in the liquid nitrogen tank (41) and the material storage and access portion (10).

8. The automated liquid nitrogen storage device according to claim 7, characterized in that: The mounting platform is provided with a sample box hole (11); the material storage and access portion (10) comprises a lifting drive and a horizontal lofting plate; the horizontal lofting plate is located directly below the sample box hole (11), and the sample storage box is placed on the horizontal lofting plate; the lifting drive is connected to the bottom of the horizontal lofting plate, drives the horizontal lofting plate to move back and forth in the vertical direction, and drives the sample storage box on the horizontal lofting plate to pass through the sample box hole (11), and the horizontal lofting plate seals the lower end of the sample box hole (11); the upper end of the sample box hole (11) is provided with a sealing member (20) for sealing the sample box hole (11), and the sealing member (20) automatically opens and closes according to the storage and access requirements of the sample.

9. The automated liquid nitrogen storage device according to claim 8, characterized in that: It also includes a transparent sealing cover; the transparent sealing cover is covered on the mounting platform, a partition plate is provided inside the transparent sealing cover, and the partition plate mounting platform is divided into a storage area and an operation area; the automatic storage and retrieval mechanism and the sealing member (20) are both located in the operation area; the automatic sealing component (70) and the automatic extraction component (80) are both located in the storage area; a transfer door (60) connecting the storage area and the operation area is provided on the partition plate, and the transfer door (60) is electrically connected to a computer and automatically opens and closes according to sampling requirements.

10. The automated liquid nitrogen storage device according to claim 9, characterized in that: The invention also comprises a humidity sensor, a dehumidifier and a visual recognition sensor; the humidity sensor and the dehumidifier are both installed in a transparent sealing cover, automatically detecting the humidity in the transparent sealing cover and automatically dehumidifying; the visual recognition sensor comprises a first recognition camera and a second recognition camera (42); the first recognition camera is arranged in the extraction box (81), and automatically verifies the position of the sample storage box on the freezing rack (91) according to the access requirements of the sample; the second recognition camera (42) is arranged on one side of the liquid nitrogen tank (41), and automatically verifies the sample information clamped by the first manipulator (31) according to the access requirements of the sample.

Images