An intelligent refrigerator for storing biological samples

Abstract

The present invention discloses an intelligent refrigerator for storing biological samples, comprising: an incubator housing, a drum storage rack, a drum driving mechanism, a gripper handling mechanism and a sample test tube entrance and exit, wherein a test tube rack in and out automatic handling mechanism is arranged in the incubator housing, and the test tube rack in and out automatic handling mechanism comprises a test tube rack in and out box, an upper pretreatment area and a lower test tube selection area, wherein the upper pretreatment area comprises a test tube holder driving module, a first test tube holder, a defrosting mechanism, a visual camera mechanism and a first sealing door, and the lower test tube selection area comprises an X-axis linear driving module, a Z-axis linear driving module, a Y-axis clamping claw linear driving module and a second sealing door, and the two groups of X-axis linear driving modules are both provided with a second test tube holder, and the Y-axis linear driving module is provided with a test tube clamping claw. The present invention realizes a full-function process of pretreatment of sample in and out of the warehouse, and realizes flexible application of whole storage and whole retrieval and zero storage and zero retrieval of samples.

Description

Technical Field

[0001] The present invention relates to the technical field of low-temperature storage, and in particular to an intelligent refrigerator for storing biological samples. Background Art

[0002] At present, -80℃ low-temperature storage refrigerators are mainly used in application scenarios with small sample volume or low investment. Currently, the low-temperature refrigerator storage operation and management of samples are mainly carried out manually. The traditional storage method requires opening the refrigerator door, which affects the temperature and humidity environment inside the refrigerator, thereby affecting the storage safety of biological samples. Summary of the invention

[0003] The main technical problem solved by the present invention is to provide an intelligent refrigerator for storing biological samples, realize the full-function process of pre-processing of samples in and out of the warehouse, and realize the flexible application of whole-storage and zero-storage and zero-retrieval of samples, which has absolute advantages over manual operation of refrigerators to manage samples.

[0004] In order to solve the above technical problems, a technical solution adopted by the present invention is: an intelligent refrigerator for storing biological samples, comprising: an incubator shell, two sets of rotating drum storage racks for storing test tube racks arranged in the incubator shell, a rotating drum driving mechanism, a gripper transport mechanism for taking and placing the test tube racks in the rotating drum, and a sample test tube inlet and outlet arranged on the side of the incubator shell, wherein the incubator shell is provided with a test tube rack inlet and outlet automatic transport mechanism docked with the sample test tube inlet and outlet, and the test tube rack inlet and outlet automatic transport mechanism comprises a test tube rack inlet and outlet box, an upper pretreatment area and a lower pretreatment area. The test tube selection area, the upper pretreatment area includes a test tube holder drive module arranged on the side wall of the test tube rack inlet and outlet box, a first test tube holder arranged on the test tube holder drive module and capable of horizontal movement, a defrosting mechanism, a visual camera mechanism and a first sealing door, the lower test tube selection area includes two groups of X-axis linear drive modules, a Z-axis linear drive module, a Y-axis clamp linear drive module arranged on the Z-axis linear drive module and a second sealing door, the two groups of X-axis linear drive modules are both provided with a second test tube holder, and the Y-axis linear drive module is provided with a test tube clamp.

[0005] In a preferred embodiment of the present invention, the bottoms of the first test tube holder and the second test tube holder are hollow structures, and the first test tube holder and the second test tube holder are provided with secondary positioning mechanisms.

[0006] In a preferred embodiment of the present invention, the secondary positioning mechanism is an electromagnetic coil push rod diagonally arranged on the first test tube holder or the second test tube holder, and the electromagnetic coil push rod has a pressing and positioning effect on the test tube racks in the first test tube holder and the second test tube holder.

[0007] In a preferred embodiment of the present invention, the visual camera mechanism is disposed below the first test tube rack, and the visual camera mechanism uses a CCD camera to obtain the two-dimensional code information of each test tube on the first test tube rack.

[0008] In a preferred embodiment of the present invention, the gripper transport mechanism includes a lifting drive assembly and a transport drive assembly, the lifting drive assembly includes a lifting column arranged in the insulation box shell, a ball screw module arranged on the lifting column, a guide slide rail arranged on the side of the lifting column, and a fixed plate connected to the slider on the slide rail, the ball screw module is connected to the fixed plate and can drive the fixed plate to perform lifting movement; the transport drive assembly includes a base plate connected to the fixed plate, a rotation drive mechanism and a multi-stage telescopic feeding mechanism, the gripper is arranged on the multi-stage telescopic feeding mechanism, the rotation drive mechanism is arranged below the multi-stage telescopic feeding mechanism and can drive the multi-stage telescopic feeding mechanism to rotate to facilitate the gripper to grab test tube racks in different directions, the rotation drive mechanism includes a turntable drive motor arranged on the base plate, and the output end of the turntable drive motor is connected to a rotating shaft arranged below the multi-stage telescopic feeding mechanism through a belt.

[0009] In a preferred embodiment of the present invention, the multi-stage telescopic material feeding mechanism includes a primary turntable plate, a secondary telescopic plate, a tertiary telescopic plate and a swing arm driving assembly, the secondary telescopic plate and the primary turntable plate are slidably connected via a first slide rail, the tertiary telescopic plate and the secondary turntable plate are slidably connected via a second slide rail, sprocket chain assemblies are respectively provided on both sides of the secondary telescopic plate, the swing arm driving assembly includes a swing arm driving motor and a swing arm provided on the primary turntable plate, one end of the swing arm is connected to the swing arm driving motor, and the other end is provided in a slide groove below the secondary telescopic plate, the swing arm driving motor can drive the extension and retraction movements of the secondary telescopic plate and the tertiary telescopic plate.

[0010] In a preferred embodiment of the present invention, the sprocket chain assembly includes sprockets diagonally arranged on both sides of the secondary telescopic plate and a chain A wound around the sprockets, one end of the chain A is connected to the primary turntable plate, and the other end of the chain A is connected to the tertiary telescopic plate.

[0011] In a preferred embodiment of the present invention, the rotary drum storage rack includes a group of concentrically arranged inner rotary drum storage racks and outer rotary drum storage racks, the rotary drum driving mechanism is arranged above the top plate of the incubator shell, including an inner rotary drum driving assembly for driving the inner rotary drum storage rack to rotate forward or reversely and an outer rotary drum driving assembly for driving the outer rotary drum storage rack to rotate forward or reversely, the inner rotary drum storage rack and the outer rotary drum storage rack have the same structure, including a rotary drum, freezing racks arranged in layers around the circumference of the rotary drum, and test tube racks arranged in several freezing racks, the side plates on both sides of the freezing rack are fixedly connected to the upper and lower plates of the rotary drum, the freezing rack is a sheet metal part, and the gap between two adjacent layers of test tube racks in the freezing rack is close to 8MM.

[0012] In a preferred embodiment of the present invention, a group of spaces are vacated among the plurality of freezing racks distributed in a ring shape in the outer drum storage rack to form a material taking station, so as to facilitate the gripper to grab the test tube rack in the freezing rack on the inner drum storage rack.

[0013] In a preferred embodiment of the present invention, the inner drum drive assembly includes a first worm drive motor arranged above the top plate of the insulation box shell and a first worm connected to the first worm drive motor, the first worm is meshed with a first gear at the top of the rotating shaft of the inner drum storage rack; the outer drum drive assembly includes a second worm drive motor arranged above the top plate of the insulation box shell and a second worm connected to the second worm drive motor, the second worm is meshed with a second gear at the top of the rotating shaft of the outer drum storage rack.

[0014] The beneficial effects of the present invention are as follows: the present invention can realize the test tube sorting operation in the refrigerator shell through the test tube rack automatic transport mechanism, realize the full-function process of pre-processing of samples in and out of the warehouse, and realize the flexible application of whole storage and whole retrieval and zero storage and zero retrieval of samples; the gripper interacts with the rotation of the rotary drum storage rack through the lifting and rotating functions to realize grabbing of any group of test tube racks on the freezing racks in the rotary drum storage rack on the left and right sides, and the gripper cooperates with the multi-stage telescopic material collection mechanism to grasp the test tube rack at double depth, occupies less space, is easy to use, can realize fully automatic biological sample low-temperature storage and retrieval operation, and effectively improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0016] Figure 1 It is a structural schematic diagram of an intelligent refrigerator for storing biological samples of the present invention;

[0017] Figure 2 It is a structural schematic diagram of the automatic transport mechanism for test tube racks in and out of the present invention;

[0018] Figure 3 This is a structural schematic diagram of another perspective of the automatic transport mechanism for the test tube rack in and out of the present invention.

[0019] Figure 4 It is a structural schematic diagram of the rotary drum driving mechanism of the present invention;

[0020] Figure 5 It is a structural schematic diagram of a lifting drive component and a transport drive component in an intelligent refrigerator for storing biological samples of the present invention;

[0021] Figure 6 It is a schematic diagram of a transport drive assembly in an intelligent refrigerator for storing biological samples of the present invention when it is in an extended state;

[0022] Figure 7 It is a partial structural schematic diagram of a transport drive assembly in an intelligent refrigerator for storing biological samples of the present invention when it is in an extended state;

[0023] Figure 8 It is a cross-sectional view of a rotary drum storage rack in an intelligent refrigerator for storing biological samples according to the present invention. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1-3 , an embodiment of the present invention: an intelligent refrigerator for storing biological samples, comprising: an incubator shell 1, two sets of rotary drum storage racks 2 for storing test tube racks arranged in the incubator shell, a rotary drum driving mechanism 3, a gripper transport mechanism for taking and placing the test tube racks in the rotary drum, and a sample test tube entrance and exit 4 arranged on the side of the incubator shell, wherein the gripper transport mechanism comprises a lifting drive assembly 5 and a transport drive assembly 6, an insulation layer 7 is arranged on the top plate of the incubator shell, a storage area of ​​-80°C is provided in the incubator shell, and the top of the equipment is separated by an insulation layer to ensure that the heat generated by the equipment and the coldness of the storage area offset each other, thereby optimizing the sample storage environment and ensuring the safety of the samples.

[0026] The incubator shell is provided with a test tube rack in-and-out automatic transport mechanism 8 docked with the sample test tube inlet and outlet, the test tube rack in-and-out automatic transport mechanism includes a test tube rack in-and-out box body 801, an upper pretreatment area and a lower test tube selection area, a foam insulation layer can be provided on the outside of the test tube rack in-and-out box body to achieve temperature isolation from the internal low temperature area, the upper pretreatment area includes a test tube rack drive module 802 provided on the side wall of the test tube rack in-and-out box body, a first test tube rack 803 provided on the test tube rack drive module and capable of horizontal movement, a defrosting mechanism 804, a visual camera mechanism 805 and a first sealing door 806, the first sealing door adopts a rotating The test tube rack driving module drives the first test tube rack to move horizontally through the lead screw, switches to the defrosting, photographing and docking position with the internal gripper, and after the first sealed door is opened, the internal gripper can be driven by the gripper transport mechanism to grab the test tube rack, wherein the visual photographing mechanism is arranged under the first test tube rack and adopts a CCD camera to obtain the QR code information of each test tube on the first test tube rack, and the defrosting mechanism adopts the alcohol spraying device in the prior art to complete the test tube rack cleaning function, and makes the subsequent photographing and code reading more accurate and efficient by cleaning the test tube and the bottom of the test tube rack.

[0027] The lower test tube selection area includes two groups of X-axis linear drive modules 807, a Z-axis linear drive module 808 and a Y-axis clamping claw linear drive module 809 arranged on the Z-axis linear drive module. The two groups of X-axis linear drive modules are provided with a second test tube bracket 810, and the Y-axis linear drive module is provided with a test tube clamping claw 811. The X-axis linear drive module includes two groups of lead screw slides to drive a group of second test tube rack brackets to achieve horizontal X-direction movement for switching the tube picking work and the gripper docking function. The vertical Z-axis linear drive module has two sets of linear slides and lead screws. The horizontal Y-axis linear drive module is realized by a group of lead screws and linear guides at the moving end. The test tube selection operation of the upper and lower test tube rack samples is realized through the linkage of XYZ. The two groups of second There is a group of spare test tube holders in the test tube rack. When the background control system controls the test tube grippers to select the required test tubes and place them in the spare test tube holders according to demand, the X-axis linear drive module drives the spare test tube holders after selecting the required test tubes to move to the second sealed door 812 position. The second sealed door also adopts a rotary sealed door. After the second sealed door is opened, the internal gripper can be driven by the gripper transport mechanism to raise the spare test tube holder to the first sealed door, and then the test tube holder drive module transports multiple test tubes in the selected spare test tube holders to the sample test tube entrance and exit at the same time to achieve automatic docking with the external AGV. It should be noted that all linear drive modules can be selected but are not limited to linear modules with lead screws and slide rails in the prior art.

[0028] Specifically, the bottom of the first test tube holder and the second test tube holder is a hollow structure to facilitate camera photography. The first test tube holder and the second test tube holder are provided with a secondary positioning mechanism, which is an electromagnetic coil push rod 813 diagonally arranged on the first test tube holder or the second test tube holder. The electromagnetic coil push rod at the diagonal position is pressed to provide a secondary positioning function after the test tube holder is in place, thereby improving the positioning accuracy and improving the safety of equipment operation.

[0029] like Figure 4-8 As shown, there are two groups of drum storage racks, one of which is a double-drum storage rack, which includes an inner drum storage rack 21 and an outer drum storage rack 22 which are arranged concentrically. The drum driving mechanism is arranged above the top plate of the heat preservation box shell, including an inner drum driving assembly 31 for driving the inner drum storage rack to rotate forward or reversely, and an outer drum driving assembly 32 for driving the outer drum storage rack to rotate forward or reversely. The transport driving assembly is used to drive the rotation and extension of the gripper to grab the test tube racks in the inner drum storage rack and the outer drum storage rack. The movement trajectory of the gripper is within the range of the inscribed circle formed by the inner and outer drum mechanisms and the test tube rack entrances and exits, and the center of the inscribed circle is the rotation center of the gripper. The inner drum storage rack and the outer drum storage rack have the same structure, including a drum 211, a layered structure around the circumference of the drum. The freezing rack 212 arranged in the rotating drum and the test tube rack arranged in several freezing racks, the side panels on both sides of the freezing rack are fixedly connected to the upper and lower plates of the rotating drum, the freezing rack is a sheet metal part, the gap between the test tube racks in the freezing rack is close to 8MM, the rotating shaft of the inner ring and the outer ring of the inner rotating drum storage rack is a round tube, and the inner and outer sides can be rotated at different angles through bearing connection. Several freezing racks distributed in a ring shape in the outer rotating drum storage rack leave a group of spaces to form a material retrieval station 15, so as to facilitate the gripper to grab the test tube rack in the freezing rack on the inner rotating drum storage rack. The gripper can realize double-depth grabbing. The setting of the inner and outer two-layer rotating drum storage racks can store more biological samples. Compared with the previous single-layer freezing rack form, the double-layer storage has a great advantage and saves more volume.

[0030] Specifically, the inner drum drive assembly includes a first worm drive motor 311 arranged above the top plate of the insulation box shell and a first worm 312 connected to the first worm drive motor, the first worm is meshed with a first gear 313 at the top of the shaft of the inner drum storage rack; the outer drum drive assembly includes a second worm drive motor 321 arranged above the top plate of the insulation box shell and a second worm 322 connected to the second worm drive motor, the second worm is meshed with a second gear 323 at the top of the shaft of the outer drum storage rack, the inner drum drive assembly and the outer drum drive assembly are both connected to a manual drum drive assembly, the manual drum drive assembly includes a parallel shaft fixing frame 9 and a parallel shaft 10 rotatably arranged on the parallel shaft fixing frame, one end of the parallel shaft is connected to one end of the first worm through a chain B 11 transmission, which can be used to manually rotate the internal drum storage rack, and is used for manually rotating the drum storage rack when a power outage occurs.

[0031] The lifting drive assembly 5 includes a lifting column 51 arranged in the incubator shell, a ball screw module 52 arranged on the lifting column, a guide slide rail 53 arranged on the side of the lifting column, and a fixed plate 54 connected to the slider on the slide rail. The ball screw module is connected to the fixed plate and can drive the fixed plate to perform lifting and lowering movements. The transport drive assembly 6 includes a bottom plate 601 connected to the fixed plate, a rotation drive mechanism and a multi-stage telescopic material-collecting mechanism. The gripper is arranged on the multi-stage telescopic material-collecting mechanism. The rotation drive mechanism is arranged below the multi-stage telescopic material-collecting mechanism and can drive the multi-stage telescopic material-collecting mechanism to rotate to facilitate the gripper to grab test tube racks in different directions. The rotation drive mechanism includes a turntable drive motor 602 arranged on the bottom plate. The output end of the turntable drive motor is connected to a rotating shaft 613 arranged below the first-level turntable plate through a belt 603. Through the interaction of the lifting and rotating functions and the rotation of the rotary drum storage rack, any group of test tube racks on the inner and outer rings of the freezing racks on the left and right sides can be grabbed.

[0032] The multi-stage telescopic material-grabbing mechanism includes a primary turntable plate 604, a secondary telescopic plate 605, a tertiary telescopic plate 606 and a swing arm drive assembly. The secondary telescopic plate and the primary turntable plate are slidably connected via a first slide rail 607, and the tertiary telescopic plate and the secondary turntable plate are slidably connected via a second slide rail 608. Sprocket chain assemblies are respectively provided on both sides of the secondary telescopic plate. The swing arm drive assembly includes a swing arm drive motor 609 and a swing arm 600 provided on the primary turntable plate. One end of the swing arm is connected to the swing arm drive motor, and the other end is provided in a slide groove 610 below the secondary telescopic plate. The swing arm drive motor can drive the swing arm to swing back and forth to drive the extension and retraction movements of the secondary telescopic plate and the tertiary telescopic plate.

[0033] Specifically, the sprocket chain assembly includes a sprocket 611 diagonally arranged on both sides of the secondary telescopic plate and a chain A 612 wound on the sprocket, one end of the chain A is connected to the primary turntable plate, and the other end of the chain A is connected to the tertiary telescopic plate, a gripper 12 is installed at the front end of the tertiary telescopic plate, and test tube rack guide plates 13 are also arranged on both sides of the gripper, and a driving motor drives the swing arm to swing toward the rotary drum storage rack, driving the secondary telescopic plate to move toward the rotary drum storage rack, and through the cooperation of the sprocket and the chain, the tertiary telescopic plate can be driven to move toward the rotary drum storage rack to support the test tube rack 14 in the freezing rack. The setting of the multi-stage telescopic material taking mechanism can make the secondary telescopic plate and the tertiary telescopic plate slide and retract at the same time, which is convenient for supporting and transporting the test tube rack. After the test tube rack in the outer rotary drum storage rack is taken and placed, it can be further telescoped inward to the inner rotary drum freezing rack to take materials, so as to realize double-depth grabbing of the test tube rack.

[0034] The beneficial effects of the intelligent refrigerator for storing biological samples of the present invention are:

[0035] 1. The present invention can realize the test tube sorting operation in the refrigerator shell through the test tube rack automatic transport mechanism, realize the full-function process of pre-processing the sample in and out of the warehouse, and realize the flexible application of the whole storage and whole retrieval and zero storage and zero retrieval of the sample; the gripper interacts with the rotation of the rotary drum storage rack through the lifting and rotating functions to realize the grabbing of any group of test tube racks on the freezing rack in the rotary drum storage rack on the left and right sides. The gripper cooperates with the multi-stage telescopic material taking mechanism to grab the test tube rack in double depth, which occupies a small space and is easy to use. It can realize the fully automatic low-temperature storage and retrieval operation of biological samples and effectively improve the work efficiency;

[0036] 2. The worm gear drum drive mechanism is also connected to an external manual drum drive assembly, which can be used to manually rotate the internal storage rack and to manually rotate the storage rack in the event of a power outage.

[0037] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An intelligent refrigerator for storing biological samples, comprising: An incubator shell, two sets of rotating drum storage racks for storing test tube racks arranged in the incubator shell, a rotating drum driving mechanism, a gripper transport mechanism for taking and placing the test tube racks in the rotating drum, and a sample test tube inlet and outlet arranged on the side of the incubator shell, characterized in that a test tube rack inlet and outlet automatic transport mechanism docked with the sample test tube inlet and outlet is arranged in the incubator shell, the test tube rack inlet and outlet automatic transport mechanism includes a test tube rack inlet and outlet box, an upper pretreatment area and a lower test tube selection area, the upper pretreatment area includes a test tube rack drive module arranged on the side wall of the test tube rack inlet and outlet box, and a test tube rack drive module arranged on the upper surface of the test tube rack drive module. The first test tube holder, the defrosting mechanism, the visual camera mechanism and the first sealing door can be moved horizontally. The lower test tube selection area includes two groups of X-axis linear drive modules, a Z-axis linear drive module, a Y-axis clamping claw linear drive module arranged on the Z-axis linear drive module and a second sealing door. The two groups of X-axis linear drive modules are both provided with a second test tube holder, and the Y-axis linear drive module is provided with a test tube clamp. The gripper transport mechanism includes a lifting drive assembly and a transport drive assembly. The lifting drive assembly includes a lifting column arranged in the incubator shell, a ball screw module arranged on the lifting column and a The guide slide rails on the sides of the lifting column and the fixed plate connected to the slider on the slide rails, the ball screw module is connected to the fixed plate and can drive the fixed plate to perform lifting movements; the transport drive assembly includes a base plate connected to the fixed plate, a rotation drive mechanism and a multi-stage telescopic material-collecting mechanism, the gripper is arranged on the multi-stage telescopic material-collecting mechanism, the rotation drive mechanism is arranged below the multi-stage telescopic material-collecting mechanism and can drive the multi-stage telescopic material-collecting mechanism to rotate to facilitate the gripper to grab test tube racks in different directions, the rotation drive mechanism includes a turntable drive motor arranged on the base plate, and the output end of the turntable drive motor is connected to the The belt is connected to the rotating shaft arranged below the multi-stage telescopic material taking mechanism, the rotating drum storage rack includes a group of concentrically arranged inner rotating drum storage rack and outer rotating drum storage rack, the rotating drum driving mechanism is arranged above the top plate of the incubator shell, including an inner rotating drum driving assembly driving the inner rotating drum storage rack to rotate forward or reversely and an outer rotating drum driving assembly driving the outer rotating drum storage rack to rotate forward or reversely, the inner rotating drum storage rack and the outer rotating drum storage rack have the same structure, including a rotating drum, freezing racks arranged in layers around the circumference of the rotating drum, and test tube racks arranged in several freezing racks, and the side plates on both sides of the freezing racks are fixedly connected to the upper and lower plates of the rotating drum.

2. The intelligent refrigerator for storing biological samples according to claim 1, characterized in that: The bottoms of the first test tube bracket and the second test tube bracket are hollow structures, and the first test tube bracket and the second test tube bracket are provided with secondary positioning mechanisms.

3. The intelligent refrigerator for storing biological samples according to claim 2, characterized in that: The secondary positioning mechanism is an electromagnetic coil push rod diagonally arranged on the first test tube bracket and the second test tube bracket, and the electromagnetic coil push rod has a pressing and positioning effect on the test tube racks in the first test tube bracket and the second test tube bracket.

4. The intelligent refrigerator for storing biological samples according to claim 1, characterized in that: The visual camera mechanism is arranged below the first test tube bracket and adopts a CCD camera to obtain the two-dimensional code information of each test tube on the first test tube bracket.

5. The intelligent refrigerator for storing biological samples according to claim 1, characterized in that: The multi-stage telescopic material-grabbing mechanism includes a primary turntable plate, a secondary telescopic plate, a tertiary telescopic plate and a swing arm driving assembly. The secondary telescopic plate is slidably connected to the primary turntable plate via a first slide rail, and the tertiary telescopic plate is slidably connected to the secondary telescopic plate via a second slide rail. Sprocket chain assemblies are respectively provided on both sides of the secondary telescopic plate. The swing arm driving assembly includes a swing arm driving motor and a swing arm provided on the primary turntable plate. One end of the swing arm is connected to the swing arm driving motor, and the other end is provided in a slide groove below the secondary telescopic plate. The swing arm driving motor can drive the extension and retraction movements of the secondary telescopic plate and the tertiary telescopic plate.

6. The intelligent refrigerator for storing biological samples according to claim 5, characterized in that: The sprocket chain assembly includes sprockets diagonally arranged on both sides of the secondary telescopic plate and a chain A wound around the sprockets, one end of the chain A is connected to the primary turntable plate, and the other end of the chain A is connected to the tertiary telescopic plate.

7. The intelligent refrigerator for storing biological samples according to claim 1, characterized in that: The freezing rack is a sheet metal part, and the gap between two adjacent layers of test tube racks in the freezing rack is close to 8MM.

8. The intelligent refrigerator for storing biological samples according to claim 1, characterized in that: A group of spaces are vacated among the plurality of freezing racks distributed in a ring shape in the outer drum storage rack to form a material taking station, so as to facilitate the gripper to grab the test tube rack in the freezing rack on the inner drum storage rack.

9. The intelligent refrigerator for storing biological samples according to claim 1, characterized in that: The inner drum drive assembly includes a first worm drive motor arranged above the top plate of the insulation box shell and a first worm connected to the first worm drive motor, the first worm being meshed with a first gear at the top of the rotating shaft of the inner drum storage rack; the outer drum drive assembly includes a second worm drive motor arranged above the top plate of the insulation box shell and a second worm connected to the second worm drive motor, the second worm being meshed with a second gear at the top of the rotating shaft of the outer drum storage rack.

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