Dewar tank with small sampling opening

Abstract

The invention discloses a Dewar tank with a small sampling port, which comprises a tank body, a first rotating mechanism, a sample tank, a plurality of sample racks, a cold source tank, a temperature control device, a tank cover, a sampling bin and a lifting device, and is characterized in that the first rotating mechanism is arranged at the bottom of the tank body and is used for driving the sample tank to rotate; a plurality of sample cavities and a cold source cavity are formed in the sample tank; one sample rack is correspondingly arranged in one sample cavity, and a first cavity cover for sealing the sample cavity is arranged at the top of the sample rack; the cold source tanks are arranged in the cold source cavities and used for storing cold sources, a cold source bin is arranged below each sample cavity, and the cold source tanks are communicated with the cold source bins in a one-to-one correspondence manner through a plurality of liquid passing pipes; a sampling opening is formed in the tank cover; the sampling bin is arranged at the top of the tank cover and is coaxial with the sampling opening; and under the driving of the lifting device, the sample rack positioned below the sampling port can be lifted into the sampling bin. According to the Dewar tank with the small sampling opening, the loss of a cold source in the sampling and lofting process can be effectively reduced.

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 tank that preserves biological samples at ultra-low temperatures. When a large number of biological samples need to be stored, using a large dewar can effectively save energy and improve sample management efficiency compared to using multiple small dewars.

[0003] In the prior art, a plurality of sample cavities are arranged in a circular distribution in the dewar tank, and the sample cavities extend in the vertical direction. Different sample cavities can be used to place samples of different storage times, so as to facilitate the classification and placement of various samples. Since the existing dewar tank is closed by only one tank cover, the tank cover of the dewar tank needs to be opened in the actual sampling and placement operations. At this time, the openings of each sample cavity are all open, resulting in a large amount of cold source loss.

[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 object of the present invention is to provide a small sampling port Dewar tank, 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 arranged at the bottom of the tank body, and a rotating platform is arranged at the output end of the first rotating mechanism;

[0010] A sample tank is arranged on a rotating platform, a plurality of second heat-insulating layers are arranged between the sample tank and the rotating platform, a plurality of sample cavities arranged in a circumferential array and a cold source cavity arranged in the middle are arranged in the sample tank, and a third heat-insulating layer is arranged between the inner wall of the sample tank and the outer wall 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 arranged in the cold source cavity and is used to store cold sources. A cold source bin is arranged under each sample cavity. The cold source tank is connected to a plurality of cold source bins one by one through a plurality of liquid passing pipes.

[0013] The temperature control device includes a controller and a plurality of temperature regulating devices electrically connected to the controller, one temperature regulating device is correspondingly arranged at the bottom of one sample cavity, and a heat insulation structure is arranged between the temperature regulating device and the cold source bin;

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

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

[0016] The lifting device includes a first lifting mechanism arranged on the top of the sampling chamber and a material picking claw arranged 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 rise into the sampling chamber, and 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 via a plurality of release tubes.

[0018] Furthermore, the sample rack also includes a top plate, a bottom plate and a plurality of connecting columns for connecting the top plate and the bottom plate, each connecting column has a plurality of grooves arranged in a 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 meshed with the worm gear; a first through hole is opened in the middle of the rotating shaft for easy 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 a gap exists 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 taking claw comprises 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 grooves cooperating with the clamping blocks.

[0024] Furthermore, the tank cover includes a second outer shell and a plurality of sixth heat insulation layers which are 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 tank provided by the present invention has a sampling port on the tank cover, the first rotating mechanism drives the rotating platform to rotate so that multiple sample cavities can rotate to the bottom of the sampling port, and the first lifting mechanism drives the material taking claw to perform lifting and lowering movements, so as to lift the sample rack in the sample cavity into the sampling bin, so as to facilitate 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 cold sources in the remaining sample cavities can be avoided during sampling. At the same time, the loss of cold sources in the sample cavity can be reduced by lifting the sample rack to the sampling bin with a closed structure 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 a small sampling port Dewar provided by the present invention;

[0029] Figure 3 A side sectional view of a small sampling port Dewar tank 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 a sample tank in a Dewar tank with a small sampling port 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 The present invention provides a circuit diagram of a temperature control device in a Dewar tank with a small sampling port.

[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 wheel ring 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 cavity 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 passage 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, card 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, and in order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0038] In the description of the present invention, it should be understood that the terms "upper", "lower", "outer", "inner", etc., indicating orientation or positional relationship, are based on the orientation or positional relationship 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 a limitation of 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 comprises: a tank body 1, a first rotating mechanism 2, a sample tank 3, a plurality of 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 a plurality of first heat insulation layers 12 in sequence from the outside to the inside; the first rotating mechanism 2 is arranged 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 arranged on the rotating platform 21, and a plurality of second heat insulation layers 22 are arranged between the sample tank 3 and the rotating platform 21, and a plurality of sample cavities 31 arranged in a circular array and a cold source cavity 32 arranged in the middle are arranged in the sample tank 3, and a third heat insulation layer 33 is arranged 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 arranged in one sample cavity 31, a plurality of mutually parallel placement plates 41 are arranged in the sample rack 4, and a first cavity cover for sealing the sample cavity 31 is provided on the top of the sample rack 4 42; the cold source tank 5 is arranged in the cold source cavity 32 for storing the cold source, a cold source bin 53 is arranged below each sample cavity 31, and the cold source tank 5 is connected to the plurality of cold source bins 53 one by one through a plurality of liquid pipes 54; the temperature control device 6 comprises a controller 61, and a plurality of temperature regulating devices 62 respectively electrically connected to the controller 61, a temperature regulating device 62 is arranged at the bottom of a sample cavity 31, and a heat insulation structure 63 is arranged between the temperature regulating device 62 and the cold source bin 53; the tank cover 7 is used The tank body 1 is closed, and a sampling port 71 is formed on the tank cover 7; a sampling chamber 8 is arranged at the top of the tank cover 7 and is coaxially arranged with the sampling port 71; a lifting device 9 comprises a first lifting mechanism 91 arranged at the top of the sampling chamber 8 and a material taking claw 92 arranged at the output end of the first lifting mechanism 91, the material taking 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 rise 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 through 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 bin 53 through the liquid pipe 54. The cold source bin 53 provides a low temperature environment for the sample bin 31, and controls the temperature regulating device 62 to keep the temperature of the sample cavity 31 within a preset temperature range. Since 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, which are suitable for storing different samples, thereby improving the wide use of the Dewar tank.

[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, so as to lift the sample rack 4 into the sampling chamber 8. Finally, the cabinet door 81 is opened to take out the corresponding sample, or the sample is placed on the storage plate 41. Compared with the prior art, during the sampling and placement process of a 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, during 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: forward and reverse rotation 180 degrees, so as to avoid the rotating platform 21 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. The liquid nitrogen provides an ultra-low temperature condition for the corresponding sample cavity 31 in the cold source warehouse 53, so as to provide a low temperature environment suitable for storage for the sample. Wherein, the cold source tank 5 is connected with the cold source warehouse 53 through a liquid pipe 54, so as to continuously replenish the liquid nitrogen for the cold source warehouse 53, so as to ensure that the cold source warehouse 53 can continuously provide ultra-low temperature. In addition, by setting the insulation structure 63, the temperature at the bottom of the sample cavity 31 can be correspondingly increased to control the storage temperature of the entire sample cavity 31, wherein the insulation structure 63 can be a multi-layer insulation layer, and different layers of insulation layers are set to control the temperature provided by the cold source warehouse 53 for the sample warehouse 31. Since the tank body 1 is provided with a multi-layer first insulation layer 12, the rotating platform 21 is provided with a multi-layer second insulation layer 22, and the sample tank 3 is provided with a third insulation layer 33, so as to play a role of heat insulation and heat preservation for each sample cavity 31, the sample cavity 31 is 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), or 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 heating device and the cooling device are controlled separately by the controller 61 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, and each temperature sensor 64 is disposed between the sample holder 4 and the bottom of the sample cavity 31 to detect the temperature in the sample cavity 31. The temperature sensor 64 cooperates with the temperature control device 62 to maintain the temperature in the sample cavity 31 within a preset temperature range.

[0048] In a preferred embodiment, the cold source tank 5 is connected to the upper parts of the plurality of sample chambers one by one through a plurality of release tubes 51. The cold source is released into the sample chamber 31 through the release tubes 51, providing a low temperature storage condition for the upper part of the sample chamber 31, so that the temperature of the upper part and the lower part of the sample chamber 31 are close.

[0049] In a preferred embodiment, see Figure 5 The sample rack 4 further includes a top plate 43, a bottom plate 44 and a plurality of connecting posts 45 for connecting the top plate 43 and the bottom plate 44. Each connecting post 45 is provided with a plurality of grooves 451 arranged in a vertical direction, and the edge of the placement plate 41 is inserted into the groove 451. In this embodiment, the sample chamber 31 is a cylindrical structure, and accordingly, the sample rack 4 is a cylindrical structure. The three connecting posts 45 connect the top plate 43 and the bottom plate 44. When the placement plates 41 are inserted into different grooves 451, the distance between the two placement plates 41 can be adjusted to be suitable for storing samples of different 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 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 disposed 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 fix its position. Since the sample rack 4 is fixed on the first chamber cover 42, the sample rack 4 can be suspended in the sample chamber 31, avoiding direct contact between the bottom of the sample rack 4 and the bottom of the sample chamber 31 to exchange heat, which would cause a large deviation between the temperature at the bottom of the sample rack 4 and the temperature at other positions.

[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 cold source quickly filling the entire sample cavity 31.

[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 wheel 25 sleeved on the rotating shaft 24, a worm 26 rotatably connected to the first base 23, and a first driving motor 27 arranged on the first base 23, the output end of the first driving motor 27 is connected to the worm 26, and the worm 26 is meshed with the worm wheel 25; a first through hole 241 is opened in the middle of the rotating shaft 24 for easy threading. The first driving motor 27 drives the worm 26 to rotate, and the worm 26 is meshed with the worm wheel 25 to drive the rotating shaft 24 to rotate forward or reverse, thereby driving the rotating platform 21 to rotate, so as to realize the rotation of 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, and 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, enter the cold source cavity 32 and 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 pipelines.

[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 heat 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 placing process, thereby increasing the loss of the cold source.

[0057] In order to add new cold source to the cold source tank 5, the cold source tank 5 is connected with 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 to replenish the cold source of the cold source tank 5 from the outside.

[0058] Optionally, the replenishing tube 52 is disposed 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 from the second through hole 34 and the first through hole 341. The releasing tube 51 is disposed 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 thereof is connected to the sample cavity 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 sampling, 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 cold sources during sampling and placing.

[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, so as to reduce 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 taking claw 92 includes a pneumatic clamp 921, a proximity switch 922 arranged on the pneumatic clamp 921, and two clamping blocks 923. The pneumatic clamp 921 drives the two clamping blocks 923 to move toward or away from each other synchronously. The first chamber cover 42 is provided with two clamping slots 421 cooperating with the clamping blocks 923. The proximity switch 922 is electrically connected to the controller 61, and 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 toward each other synchronously. The two clamping blocks 923 are respectively clamped into the clamping 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 moves upward accordingly, thereby lifting the sample rack 4 to 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 matching 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 heat insulation layers 73 arranged in sequence from top to bottom. The second outer shell 72 is fitted with the top of the first outer shell 11 to form a sealed space between the tank body 1 and the tank body 1, and multiple layers of the first heat insulation layer 12 and the sixth heat insulation layer 73 are arranged to effectively prevent heat exchange between the inside 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 being arranged at the output end of the second rotating mechanism 10, and the output end of the second lifting mechanism 20 being connected to the tank cover 7. When maintenance is required, the second lifting mechanism 20 drives the tank cover 7 to move upward, and after the tank cover 7 is 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 is away from the top of the tank body 1, so that the operator can 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 perform lifting motion and drive the tank cover 7 to perform lifting motion.

[0067] The second rotating mechanism 10 includes a second base 101, a driven wheel 102 rotatably connected to the second base 101, a second driving motor disposed on the second base 101, and a driving wheel 103 disposed at the output end of the second driving motor, the driving wheel 103 meshes with the driven wheel 102, and the second lifting mechanism 20 is fixedly connected to the driven wheel 102. When in use, the second driving motor drives the driving wheel 103 to rotate, and the driving wheel 103 meshes 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 protection scope of the claims attached to the present invention.

Claims

1. Small sampling port Dewar, characterized in that: 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 arranged at the bottom of the tank body, and a rotating platform is arranged at the output end of the first rotating mechanism; A sample tank is arranged on a rotating platform, a plurality of second heat-insulating layers are arranged between the sample tank and the rotating platform, a plurality of sample cavities arranged in a circumferential array and a cold source cavity arranged in the middle are arranged in the sample tank, and a third heat-insulating layer is arranged between the inner wall of the sample tank and the outer wall 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 arranged in the cold source cavity and is used to store cold sources. A cold source bin is arranged under each sample cavity. The cold source tank is connected to a plurality of cold source bins one by one through a plurality of liquid passing pipes. The temperature control device includes a controller and a plurality of temperature regulating devices electrically connected to the controller, one temperature regulating device is correspondingly arranged at the bottom of one sample cavity, and a heat insulation structure is arranged between the temperature regulating device and the cold source bin; A tank cover, used to close the tank body, and having a sampling port on the tank cover; The sampling chamber is arranged on the top of the tank cover and is coaxially arranged with the sampling port; The lifting device includes a first lifting mechanism arranged on the top of the sampling chamber and a material picking claw arranged 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 rise into the sampling chamber, and 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 with 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 a plurality of connecting columns for connecting the top plate and the bottom plate, each connecting column is provided with a plurality of grooves arranged in a vertical direction, and the edge of the storage plate is inserted into the groove; a fourth heat 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 wheel sleeved on the rotating shaft, a worm rotatably connected to the first base, and a first driving motor arranged on the first base, wherein the output end of the first driving motor is connected to the worm, and the worm is meshed with the worm wheel; a first through hole is opened in the middle of the rotating shaft for easy threading.

6. The small sampling port Dewar according to claim 1, characterized in that: A first installation step is arranged on the top of the cold source cavity, and the cold source tank is arranged on the first installation step so that a gap exists 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 comprises a pneumatic clamping claw, a proximity switch arranged on the pneumatic clamping claw and two clamping blocks. The pneumatic clamping claw drives the two clamping blocks to move toward or away from each other synchronously. The first cavity cover is provided with two clamping grooves matching 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 arranged in sequence 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 also 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.

Images