Small sampling port Dewar

Abstract

The present invention discloses a small sampling port Dewar jar, comprising: a jar body, a first rotating mechanism, a sample jar, a plurality of sample racks, a cold source jar, a temperature control device, a jar cover, a sampling bin, and a lifting device, wherein the first rotating mechanism is arranged at the bottom of the jar body for driving the sample jar to rotate; the sample jar is provided with a plurality of sample cavities and a cold source cavity; a sample rack is arranged in each sample cavity, and a first cavity cover for sealing the sample cavity is provided on the top of the sample rack; the cold source jar is arranged in the cold source cavity for storing a cold source, a cold source bin is provided below each sample cavity, and the cold source jar is connected to the plurality of cold source bins one by one through a plurality of liquid passages; a sampling port is provided on the jar cover; the sampling bin is arranged at the top of the jar cover and is coaxial with the sampling port; and under the drive of the lifting device, the sample rack located below the sampling port can be raised into the sampling bin. The small sampling port Dewar jar provided by the present invention can effectively reduce the loss of cold source during sampling and setting out.

Description

Technical Field

[0001] The invention relates to the technical field of Dewar jars, in particular to a Dewar jar with a small sampling port. Background Art

[0002] A dewar is a container used to store biological samples at ultra-low temperatures. When storing large quantities of biological samples, using a single large dewar can significantly save energy and improve sample management efficiency compared to using multiple smaller dewars.

[0003] In existing technology, a dewar jar has multiple sample chambers arranged in a circular pattern, extending vertically. Different sample chambers can hold samples of varying storage ages, facilitating the categorization and placement of various samples. Because existing dewar jars are sealed with only a single lid, sampling and placement operations require the lid to be opened. This leaves all sample chambers open, resulting in significant cooling losses.

[0004] It can be seen that the existing technology still needs to be improved and enhanced. Summary of the Invention

[0005] In view of the above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a small sampling port Dewar jar, aiming to solve the technical problem of the prior art that the openings of each sample cavity are open during the sampling process, resulting in a large loss of cold source.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] Small sampling port dewar, including:

[0008] A tank body, wherein the tank body is provided with a first outer shell and a plurality of first heat insulation layers in sequence from the outside to the inside;

[0009] A first rotating mechanism is provided at the bottom of the tank body, and a rotating platform is provided at the output end of the first rotating mechanism;

[0010] The sample tank is arranged on the rotating platform, and a plurality of second thermal insulation layers are provided between the sample tank and the rotating platform. The sample tank is provided with a plurality of sample cavities arranged in a circumferential array, and a cold source cavity provided in the middle. A third thermal insulation layer is provided between the inner wall of the sample tank and the outer walls of the sample cavity and the outer wall of the cold source cavity.

[0011] A plurality of sample racks, one sample rack correspondingly arranged in one sample cavity, a plurality of mutually parallel placement plates arranged in the sample rack, and a first cavity cover for sealing the sample cavity arranged on the top of the sample rack;

[0012] A cold source tank is provided in the cold source cavity and is used to store cold sources. A cold source compartment is provided under each sample cavity. The cold source tank is connected to multiple cold source compartments one by one through a plurality of liquid pipes.

[0013] The temperature control device includes a controller and several temperature regulating devices electrically connected to the controller. One temperature regulating device is correspondingly arranged at the bottom of each sample chamber, and a heat insulation structure is provided between the temperature regulating device and the cold source chamber.

[0014] A tank cover, used to close the tank body, and having a sampling port on the tank cover;

[0015] The sampling chamber is located on the top of the tank cover and is coaxial with the sampling port;

[0016] The lifting device includes a first lifting mechanism provided on the top of the sampling chamber and a material picking claw provided at the output end of the first lifting mechanism. The material picking claw is used to grab the first cavity cover so that under the drive of the lifting device, the sample rack located below the sampling port can be raised into the sampling chamber. A cabinet door is hinged on the sampling chamber.

[0017] Furthermore, the cold source tank is connected to the upper parts of the plurality of sample cavities in a one-to-one correspondence through a plurality of release tubes.

[0018] Furthermore, the sample rack also includes a top plate, a bottom plate and several connecting columns for connecting the top plate and the bottom plate, each connecting column has several grooves arranged in the vertical direction, and the edge of the storage plate is inserted into the groove; a fourth insulation layer is provided between the top plate and the first cavity cover.

[0019] Furthermore, the storage plate is a perforated plate.

[0020] Furthermore, the first rotating mechanism includes a first base, a rotating shaft rotatably connected to the first base, a worm gear sleeved on the rotating shaft, a worm rotatably connected to the first base, and a first driving motor arranged on the first base, the output end of the first driving motor is connected to the worm, and the worm is engaged with the worm gear; a first through hole is opened in the middle of the rotating shaft for facilitating threading.

[0021] Furthermore, a first installation step is provided on the top of the cold source cavity, and the cold source tank is provided on the first installation step so that there is a gap between the bottom of the cold source tank and the bottom of the cold source cavity.

[0022] Furthermore, a plurality of cabinet doors are arranged in parallel along the vertical direction, and each cabinet door is provided with an observation window.

[0023] Furthermore, the material-retrieving claw includes a pneumatic clamp, a proximity switch provided on the pneumatic clamp, and two clamping blocks. The pneumatic clamp drives the two clamping blocks to move toward or away from each other synchronously. The first cavity cover is provided with two clamping slots that cooperate with the clamping blocks.

[0024] Furthermore, the tank cover includes a second outer shell and a plurality of sixth heat insulation layers arranged in sequence from top to bottom.

[0025] Furthermore, it also includes a second rotating mechanism and a second lifting mechanism. The second lifting mechanism is arranged at the output end of the second rotating mechanism, and the output end of the second lifting mechanism is connected to the tank cover.

[0026] Beneficial effects: The small sampling port Dewar jar provided by the present invention has a sampling port provided on the jar cover, a first rotating mechanism drives the rotating platform to rotate so that multiple sample cavities can be rotated to the position directly below the sampling port, and a first lifting mechanism drives the material taking claw to perform lifting and lowering movements, thereby lifting the sample rack in the sample cavity into the sampling chamber, thereby facilitating the removal of the required samples. Since each sample rack is provided with a first cavity cover for sealing the sample cavity, the loss of cooling sources in the remaining sample cavities can be avoided during sampling. At the same time, the loss of cooling sources in the sample cavity can be reduced by lifting the sample rack to the closed sampling chamber before sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A structural diagram of a small sampling port Dewar tank provided by the present invention;

[0028] Figure 2 An exploded view of the small sampling port Dewar provided by the present invention;

[0029] Figure 3 A side sectional view of a Dewar jar with a small sampling port provided by the present invention;

[0030] Figure 4 An exploded view of a sample tank in a Dewar tank with a small sampling port provided by the present invention;

[0031] Figure 5 A partial exploded view of the sample tank in the small sampling port Dewar tank provided by the present invention;

[0032] Figure 6 A partial cross-sectional view of a sample tank in a Dewar tank with a small sampling port provided by the present invention;

[0033] Figure 7 An exploded view of the sampling chamber in the small sampling port Dewar tank provided by the present invention;

[0034] Figure 8 This is a circuit diagram of the temperature control device in the small sampling port Dewar tank provided by the present invention.

[0035] Reference numerals: tank body 1, first shell 11, first thermal insulation layer 12, first rotating mechanism 2, rotating platform 21, second thermal insulation layer 22, first base 23, rotating shaft 24, first through hole 241, worm gear 25, worm 26, first driving motor 27, sample tank 3, sample cavity 31, second mounting step 311, cold source cavity 32, first mounting step 321, third thermal insulation layer 33, second through hole 34, second cavity cover 35, fifth thermal insulation layer 36, annular support bar 37,

[0036] Sample rack 4, storage plate 41, first chamber cover 42, card slot 421, top plate 43, bottom plate 44, connecting column 45, groove 451, fourth thermal insulation layer 46, cold source tank 5, release tube 51, replenishing tube 52, cold source bin 53, liquid pipe 54, temperature control device 6, controller 61, temperature regulating device 62, thermal insulation structure 63, temperature sensor 64, tank cover 7, sampling port 71, second shell 72, sixth thermal insulation layer 73, sampling bin 8, cabinet door 81, observation window 811, third shell 82, seventh thermal insulation layer 83, lifting device 9, first lifting mechanism 91, material taking claw 92, pneumatic clamping claw 921, proximity switch 922, block 923, second rotating mechanism 10, second base 101, driven wheel 102, driving wheel 103, second lifting mechanism 20. DETAILED DESCRIPTION

[0037] The present invention provides a small sampling port Dewar. To make the objectives, technical solutions, and effects of the present invention more clear and explicit, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0038] In the description of the present invention, it should be understood that the terms "upper", "lower", "outer", "inner" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, and a specific orientation structure and operation, and therefore, cannot be understood as limiting the present invention. In addition, "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0039] See also Figures 1 to 8As shown, the small sampling port Dewar tank provided by the present invention includes: a tank body 1, a first rotating mechanism 2, a sample tank 3, several sample racks 4, a cold source tank 5, a temperature control device 6, a tank cover 7, a sampling chamber 8 and a lifting device 9; the tank body 1 is provided with a first shell 11 and several first thermal insulation layers 12 in sequence from the outside to the inside; the first rotating mechanism 2 is provided at the bottom of the tank body 1, and a rotating platform 21 is provided at the output end of the first rotating mechanism 2; the sample tank 3 is provided on the rotating platform 21, and several second thermal insulation layers 22 are provided between the sample tank 3 and the rotating platform 21, and the sample tank 3 is provided with several sample cavities 31 arranged in a circular array and a cold source cavity 32 provided in the middle, and a third thermal insulation layer 33 is provided between the inner wall of the sample tank 3 and the outer wall of the sample cavity 31 and the outer wall of the cold source cavity 32; there are multiple sample racks 4, one sample rack 4 is correspondingly provided in one sample cavity 31, and the sample rack 4 is provided with several mutually parallel placement plates 41, and the top of the sample rack 4 is provided with a first cavity cover for sealing the sample cavity 31 42; The cold source tank 5 is provided in the cold source cavity 32 for storing the cold source. A cold source bin 53 is provided below each sample cavity 31. The cold source tank 5 is connected to the plurality of cold source bins 53 in a one-to-one correspondence through a plurality of liquid pipes 54; The temperature control device 6 includes a controller 61 and a plurality of temperature regulating devices 62 electrically connected to the controller 61. A temperature regulating device 62 is provided at the bottom of each sample cavity 31, and an insulation structure 63 is provided between the temperature regulating device 62 and the cold source bin 53; The tank cover 7 is used The tank body 1 is sealed, and a sampling port 71 is opened on the tank cover 7; the sampling chamber 8 is arranged on the top of the tank cover 7 and is coaxially arranged with the sampling port 71; the lifting device 9 includes a first lifting mechanism 91 provided on the top of the sampling chamber 8 and a material claw 92 provided at the output end of the first lifting mechanism 91, and the material claw 92 is used to grab the first cavity cover 42, so that under the drive of the lifting device 9, the sample rack 4 located below the sampling port 71 can be raised into the sampling chamber 8, and a cabinet door 81 is hinged on the sampling chamber 8.

[0040] In the above, the sample is stored in the sample cavity 31 via the sample rack 4. To ensure that the sample can be stored in a specific low-temperature environment, the cold source tank 5 guides the cold source to each cold source compartment 53 through the liquid pipe 54. The cold source compartment 53 provides a low-temperature environment for the sample compartment 31, and controls the temperature control device 62 to keep the temperature of the sample cavity 31 within a preset temperature range. Because each sample cavity 31 is independent of each other, the temperature in each sample cavity 31 does not interfere with each other. Different sample cavities 31 can control different storage temperatures, suitable for storing different samples, and improve the versatility of the Dewar jar.

[0041] During sampling and placement, the first rotating mechanism 2 drives the rotating platform 21 to rotate an angle so that the sample chamber 31 is located directly below the sampling port 71. Then, the first lifting mechanism 91 drives the material claw 92 to move downward. After the material claw 92 grabs the first chamber cover 42, the first lifting mechanism 91 drives the material claw 92 to reset, thereby lifting the sample rack 4 into the sampling chamber 8. Finally, the cabinet door 81 is opened to take out the corresponding sample or place the sample on the storage plate 41. Compared with the prior art, during the sampling and placement process of one sample chamber 31, the remaining sample chambers 31 remain sealed under the action of the first chamber cover 42 to avoid the loss of the cold source. In addition, when sampling, the sample rack 4 in the sample chamber 31 is lifted to the sampling chamber 8 before sampling, thereby effectively reducing the loss of the cold source in the sample chamber 31.

[0042] It should be understood that the range of the first rotating mechanism 2 driving the rotating platform 21 is: 180° forward and reverse, so as to prevent the rotating platform 21 from rotating in one direction and causing the wires and pipes led out of the sample tank 3 to become tangled or entangled.

[0043] In the above, the cold source in the cold source tank 5 can be liquid nitrogen, which can provide an ultra-low temperature of -196°C. Liquid nitrogen provides ultra-low temperature conditions for the corresponding sample chamber 31 in the cold source chamber 53, so as to provide a low temperature environment suitable for storage of the sample. Wherein, the cold source tank 5 is connected to the cold source chamber 53 through a liquid pipe 54 to continuously replenish liquid nitrogen for the cold source chamber 53 to ensure that the cold source chamber 53 can continuously provide ultra-low temperatures. In addition, by providing a thermal insulation structure 63, the temperature at the bottom of the sample chamber 31 can be correspondingly increased to control the storage temperature of the entire sample chamber 31. Wherein, the thermal insulation structure 63 can be a multi-layer thermal insulation layer, with different numbers of thermal insulation layers provided, which can control the temperature provided by the cold source chamber 53 to the sample chamber 31. Since the tank body 1 is provided with multiple layers of first thermal insulation layers 12, the rotating platform 21 is provided with multiple layers of second thermal insulation layers 22, and the sample tank 3 is provided with a third thermal insulation layer 33, so as to play a role in thermal insulation for each sample chamber 31, the sample chamber 31 is kept in a sub-zero low temperature range.

[0044] To achieve the function of temperature control in the sample cavity 31 , at least one temperature control device 62 is provided in each sample cavity 31 . The temperature of the temperature control device 62 is directly transferred to the wall of the sample cavity 31 to achieve heat exchange with the sample cavity 31 .

[0045] Optionally, the sample cavity 31 is made of a material with high thermal conductivity, which further facilitates heat transfer.

[0046] Specifically, the temperature control device 62 can be a heating device (such as a heating plate, a resistance wire), a cooling device (such as a semiconductor refrigerator), or a combination of a heating device and a cooling device. According to actual storage requirements, the controller 61 controls the heating device and the cooling device respectively to increase or decrease the temperature in the sample chamber 31.

[0047] More specifically, the temperature control device 6 further includes a plurality of temperature sensors 64, which are electrically connected to the controller 61. Each temperature sensor 64 is disposed between the sample holder 4 and the bottom of the sample chamber 31 to detect the temperature within the sample chamber 31. The temperature sensors 64 cooperate with the temperature control device 62 to maintain the temperature within the sample chamber 31 within a predetermined temperature range.

[0048] In a preferred embodiment, the cold source tank 5 is connected to the upper portions of the plurality of sample chambers in a one-to-one correspondence via a plurality of release tubes 51. The release tubes 51 release the cold source into the sample chamber 31, providing low-temperature storage conditions for the upper portion of the sample chamber 31, thereby keeping the upper and lower portions of the sample chamber 31 at similar temperatures.

[0049] In a preferred embodiment, see Figure 5 The sample rack 4 further includes a top plate 43, a bottom plate 44, and several connecting posts 45 for connecting the top and bottom plates 43 and 44. Each connecting post 45 defines several vertically arranged grooves 451, into which the edges of the storage plates 41 are inserted. In this embodiment, the sample chamber 31 is cylindrical, and accordingly, the sample rack 4 is also cylindrical. The three connecting posts 45 connect the top and bottom plates 43 and 44. By inserting the storage plates 41 into different grooves 451, the distance between the two storage plates 41 can be adjusted to accommodate samples of varying heights.

[0050] In other embodiments, the sample chamber 31 and the sample rack 4 are polygonal column structures, the top plate 43 and the bottom plate 44 thereof are connected by a vertical plate, and the groove 451 is provided on the inner side of the vertical plate.

[0051] A fourth heat insulating layer 46 is provided between the top plate 43 and the first cavity cover 42 to prevent heat exchange between the sample cavity 31 and the first cavity cover 42, thereby preventing the temperature in the sample cavity 31 from increasing. Figure 4 The top of the sample chamber 31 is provided with a second mounting step 311, and the first chamber cover 42 is placed on the second mounting step 311 to secure its position. Since the sample rack 4 is secured to the first chamber cover 42, it can be suspended in the sample chamber 31, preventing the bottom of the sample rack 4 from directly contacting the bottom of the sample chamber 31 and exchanging heat, which would result in a significant temperature deviation between the bottom of the sample rack 4 and the temperature elsewhere.

[0052] Furthermore, the placement plate 41 is a perforated plate, which can reduce the weight of the sample rack 4 on the one hand, and on the other hand, since the gap between the sample rack 4 and the inner wall of the sample cavity 31 is small, the provision of multiple holes is conducive to the rapid filling of the entire sample cavity 31 by the cold source.

[0053] In a preferred embodiment, see Figure 2 、 3 The first rotating mechanism 2 includes a first base 23, a rotating shaft 24 rotatably connected to the first base 23, a worm gear 25 mounted on the rotating shaft 24, a worm 26 rotatably connected to the first base 23, and a first drive motor 27 mounted on the first base 23. The output end of the first drive motor 27 is connected to the worm 26, which meshes with the worm gear 25. A first through hole 241 is defined in the middle of the rotating shaft 24 for convenient threading. The first drive motor 27 drives the worm 26 to rotate, and the worm 26 meshes with the worm gear 25 to drive the rotating shaft 24 in forward or reverse rotation, thereby driving the rotating platform 21 to rotate, thereby rotating any sample chamber 31 to be directly below the sampling port 71.

[0054] Specifically, a second through hole 34 corresponding to the first through hole 241 is opened on the sample tank 3 and the rotating platform 21. The second through hole 34 is connected to the cold source cavity 32. The wires led out of the temperature control device 62 and the temperature sensor 64 in each sample cavity 31 pass through the second insulation layer 22 and enter the cold source cavity 32 to merge, and then are led out from the second through hole 34 and the first through hole 241 to the outside of the tank body 1 in turn.

[0055] In a preferred embodiment, see Figure 3 、 4 A first mounting step 321 is provided on the top of the cold source cavity 32, and the cold source tank 5 is provided on the first mounting step 321 so that there is a gap between the bottom of the cold source tank 5 and the bottom of the cold source cavity 32, so as to provide enough space for arranging wires and pipes.

[0056] Preferably, the cold source cavity 32 is provided with a second cavity cover 35 for sealing the cold source cavity 32, and a fifth thermal insulation layer 36 is provided on the top of the second cavity cover 35 to prevent excessive cold source from being released from the sample cavity 31 into the cold source cavity 32 during the sampling and placement process, thereby increasing the loss of the cold source.

[0057] In order to facilitate the replenishment of new cold source into the cold source tank 5, the cold source tank 5 is connected to a replenishing pipe 52, which is led out of the tank body 1 through the second through hole 34 and the first through hole 241, so as to replenish the cold source of the cold source tank 5 from the outside.

[0058] Optionally, the replenishing tube 52 is provided in the third insulation layer 33. The upper end of the replenishing tube 33 is connected to the cold source tank 5, and the lower end thereof extends to the bottom of the sample tank 3 and is led out through the second through hole 34 and the first through hole 341. The releasing tube 51 is provided in the third insulation layer 33. One end of the releasing tube 51 is connected to the cold source tank 5, and the other end is connected to the sample chamber 31.

[0059] In a preferred embodiment, see Figure 3 、 7 The plurality of cabinet doors 81 are arranged in parallel along the vertical direction, and each cabinet door 81 is provided with an observation window 811. During the sampling process, the position of the sample to be taken out can be observed through the observation window 811, and then the corresponding cabinet door 81 can be opened, which can effectively reduce the leakage of the cold source during sampling and setting out.

[0060] Preferably, the sampling chamber 8 is provided with a third outer shell 82 and a plurality of seventh heat insulation layers 83 in sequence from the outside to the inside, so as to avoid heat exchange between the inside of the sampling chamber 8 and the external environment, thereby reducing the loss of the cold source.

[0061] Similarly, an eighth heat insulation layer is provided on the inner wall of the cabinet door 81 .

[0062] In a preferred embodiment, see Figure 7 The material removal claw 92 includes a pneumatic clamp 921, a proximity switch 922 provided on the pneumatic clamp 921, and two clamping blocks 923. The pneumatic clamp 921 drives the two clamping blocks 923 to move synchronously toward or away from each other. The first chamber cover 42 has two slots 421 that cooperate with the clamping blocks 923. The proximity switch 922 is electrically connected to the controller 61. The first lifting mechanism 91 drives the pneumatic clamp 921 to move downward. When the proximity switch 922 detects the first chamber cover 42, the pneumatic clamp 921 drives the two clamping blocks 923 to move synchronously toward each other. The two clamping blocks 923 are respectively engaged in the slots 421 to clamp the first chamber cover 42. Then, the first lifting mechanism 91 drives the pneumatic clamp 921 to move upward, and the first chamber cover 42 also moves upward, thereby lifting the sample rack 4 into the sampling chamber 8.

[0063] Specifically, the outer wall of the clamping block 923 is provided with a first guiding inclined surface, and the inner wall of the clamping slot 421 is provided with a second guiding inclined surface that cooperates with the first guiding inclined surface, so as to ensure that the clamping block 923 is smoothly inserted into the clamping slot 421.

[0064] In a preferred embodiment, see Figure 3 The tank cover 7 includes a second outer shell 72 and a plurality of sixth thermal insulation layers 73 arranged in sequence from top to bottom. The second outer shell 72 is attached to the top of the first outer shell 11 to form a sealed space between the tank body 1 and the tank body 1. The multiple layers of the first thermal insulation layer 12 and the sixth thermal insulation layer 73 are provided to effectively prevent heat exchange between the interior of the tank body 1 and the external environment.

[0065] In a preferred embodiment, see Figure 1 、 2 , further comprising a second rotating mechanism 10 and a second lifting mechanism 20. The second lifting mechanism 20 is provided at the output end of the second rotating mechanism 10, and the output end of the second lifting mechanism 20 is connected to the tank cover 7. When maintenance is required, the second lifting mechanism 20 drives the tank cover 7 to move upward. After the tank cover 7 moves away from the tank body 1 for a certain distance, the second rotating mechanism 10 drives the second lifting mechanism 20 to rotate, so that the tank cover 7 moves away from the top of the tank body 1, making it easier for operators to perform maintenance work from the top of the tank body 1.

[0066] In the above description, the first lifting mechanism 91 and the second lifting mechanism 20 are both cylinder-driven lifting mechanisms, which respectively drive the material-taking claw 92 to move up and down, and drive the tank cover 7 to move up and down.

[0067] The second rotating mechanism 10 includes a second base 101, a driven wheel 102 rotatably connected to the second base 101, a second drive motor disposed on the second base 101, and a driving wheel 103 disposed at the output end of the second drive motor, wherein the driving wheel 103 is engaged with the driven wheel 102, and the second lifting mechanism 20 is fixedly connected to the driven wheel 102. During use, the second drive motor drives the driving wheel 103 to rotate, and the driving wheel 103 engages with the driven wheel 102 to drive the second lifting mechanism 20 to rotate, thereby driving the tank cover 7 away from the top of the tank body 1.

[0068] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the scope of protection of the claims attached to the present invention.

Claims

1. Small sampling port Dewar, characterized by: include: A tank body, wherein the tank body is provided with a first outer shell and a plurality of first heat insulation layers in sequence from the outside to the inside; A first rotating mechanism is provided at the bottom of the tank body, and a rotating platform is provided at the output end of the first rotating mechanism; The sample tank is arranged on the rotating platform, and a plurality of second thermal insulation layers are provided between the sample tank and the rotating platform. The sample tank is provided with a plurality of sample cavities arranged in a circumferential array, and a cold source cavity provided in the middle. A third thermal insulation layer is provided between the inner wall of the sample tank and the outer walls of the sample cavity and the outer wall of the cold source cavity. A plurality of sample racks, one sample rack correspondingly arranged in one sample cavity, a plurality of mutually parallel placement plates arranged in the sample rack, and a first cavity cover for sealing the sample cavity arranged on the top of the sample rack; A cold source tank is provided in the cold source cavity and is used to store cold sources. A cold source compartment is provided under each sample cavity. The cold source tank is connected to multiple cold source compartments one by one through a plurality of liquid pipes. The temperature control device includes a controller and several temperature regulating devices electrically connected to the controller. One temperature regulating device is correspondingly arranged at the bottom of each sample chamber, and a heat insulation structure is provided between the temperature regulating device and the cold source chamber. A tank cover, used to close the tank body, and having a sampling port on the tank cover; The sampling chamber is located on the top of the tank cover and is coaxial with the sampling port; The lifting device includes a first lifting mechanism provided on the top of the sampling chamber and a material picking claw provided at the output end of the first lifting mechanism. The material picking claw is used to grab the first cavity cover so that under the drive of the lifting device, the sample rack located below the sampling port can be raised into the sampling chamber. A cabinet door is hinged on the sampling chamber.

2. The small sampling port Dewar according to claim 1, characterized in that: The cold source tank is connected to the upper parts of the plurality of sample cavities in a one-to-one correspondence through a plurality of release tubes.

3. The small sampling port Dewar according to claim 1, characterized in that: The sample rack also includes a top plate, a bottom plate and several connecting columns for connecting the top plate and the bottom plate. Each connecting column has several grooves arranged in a vertical direction, and the edges of the storage plate are inserted into the grooves; a fourth insulation layer is provided between the top plate and the first cavity cover.

4. The small sampling port Dewar according to claim 1, characterized in that: The storage plate is a perforated plate.

5. The small sampling port Dewar according to claim 1, characterized in that: The first rotating mechanism includes a first base, a rotating shaft rotatably connected to the first base, a worm gear sleeved on the rotating shaft, a worm rotatably connected to the first base, and a first driving motor arranged on the first base, the output end of the first driving motor is connected to the worm, and the worm is engaged with the worm gear; a first through hole is opened in the middle of the rotating shaft for facilitating threading.

6. The small sampling port Dewar according to claim 1, characterized in that: A first installation step is provided on the top of the cold source cavity, and the cold source tank is provided on the first installation step so that a gap is provided between the bottom of the cold source tank and the bottom of the cold source cavity.

7. The small sampling port Dewar according to claim 1, characterized in that: The plurality of cabinet doors are arranged in parallel along the vertical direction, and each cabinet door is provided with an observation window.

8. The small sampling port Dewar according to claim 1, characterized in that: The material-taking claw includes a pneumatic clamp, a proximity switch arranged on the pneumatic clamp and two clamping blocks. The pneumatic clamp drives the two clamping blocks to move toward or away from each other synchronously. The first cavity cover is provided with two clamping slots that cooperate with the clamping blocks.

9. The small sampling port Dewar according to claim 1, characterized in that: The tank cover comprises a second outer shell and a plurality of sixth heat insulation layers which are sequentially arranged from top to bottom.

10. The small sampling port Dewar according to claim 1, characterized in that: The second rotating mechanism and the second lifting mechanism are further included. The second lifting mechanism is arranged at the output end of the second rotating mechanism, and the output end of the second lifting mechanism is connected to the tank cover.

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