Full-automatic nitrogen blowing filtering device

Abstract

The invention relates to a full-automatic nitrogen blowing filtering device, and relates to the technical field of experimental instruments. The test tube rack is provided with a tube rack for placing corresponding test tubes; the transfer mechanical arm is used for receiving the test tubes conveyed by the front-end pretreatment equipment and conveying the test tubes to the transition station; the carrying and liquid taking mechanical arm comprises a carrying arm and a liquid taking needle, the carrying arm is provided with a mechanical arm body capable of moving in the X direction, the Y direction and the Z direction and a carrying clamping jaw, and the liquid taking needle is arranged on the Z-direction mechanical arm body and can move in the Z direction; a cap screwing module; the rinsing and liquid adding module is used for sucking liquid in the test tubes located at the cap screwing module and / or adding liquid into the test tubes located at the cap screwing module; a nitrogen blowing module; and a vortex mixing module. By arranging the multi-module linkage full-automatic nitrogen blowing filtering device, on the basis that the full-automatic nitrogen blowing concentration function is achieved, automatic filtering of the sample liquid and automatic adding of the redissolving solution are achieved, and the concentration and extraction efficiency of the sample liquid is effectively improved.

Description

Technical Field

[0001] This application relates to the field of experimental instruments, and particularly to a fully automatic nitrogen blowing and filtering device. Background Art

[0002] Traditional nitrogen blowing concentration relies on manual operation, which has problems such as low efficiency, high error rate, and high safety risks. For example, open nitrogen blowing devices require frequent manual monitoring to prevent the solvent from drying out, and volatile solvents are directly exposed, endangering the health of operators. In trace analysis scenarios such as environmental pollutants and food agricultural residues, traditional equipment is difficult to meet the needs of large-scale sample processing.

[0003] Modern analytical techniques (such as chromatography and mass spectrometry) have significantly higher requirements for the sensitivity and accuracy of sample pretreatment. Traditional methods are difficult to achieve stable recovery rates and low cross-contamination risks.

[0004] Secondly, looking at existing automatic nitrogen blowers at home and abroad, they only include the function of automatic nitrogen blowing and do not include the function of automatic filtration; while automatic filter products only include the function of automatic filtration and do not have the function of automatic nitrogen blowing.

[0005] Therefore, this application intends to provide a fully automatic nitrogen blowing and filtering device that can complete nitrogen blowing, reconstitution, and filtering operations automatically. It can complete operations such as automatic nitrogen blowing, automatic reconstitution and mixing after nitrogen blowing, and automatic filtration into liquid and gas chromatography injection vials, and no manual intervention is required during the intermediate process. Summary of the Invention

[0006] In view of the above problems, this application is proposed to provide a fully automatic nitrogen blowing and filtering device that overcomes or at least partially solves the above problems.

[0007] The fully automatic nitrogen blowing and filtering device provided by this application adopts the following technical solutions: A fully automatic nitrogen blowing and filtering device includes: A body; A test tube rack, configured with a tube rack for placing corresponding test tubes, including an injection vial rack, a filter rack, a centrifuge tube rack, etc.; A transfer robotic arm, used to receive test tubes transported by a front-end pretreatment device and transport the test tubes to a transition station; A handling and liquid-taking robotic arm, including a handling arm and a liquid-taking needle; the handling arm is arranged above the body, configured with a robotic arm that can move in the X, Y, and Z directions and a handling gripper for clamping test tubes, and is used to clamp and transport test tubes to corresponding stations; the liquid-taking needle is arranged on the Z-direction robotic arm and can move along the Z direction by itself, and is used to suck the liquid in the test tube or add liquid to the test tube; A cap-tightening module, which cooperates with the handling and liquid-taking robotic arm and is used to open and close the caps of test tubes; A rinsing and liquid adding module, which is arranged adjacent to the capping module, is used to suck the liquid in the test tube at the capping module and / or add liquid to the test tube at the capping module; A nitrogen blowing module, which is used to perform nitrogen blowing and concentration operations on the transported test tubes; And a vortex mixing module, which is located at the next working station of the nitrogen blowing module and is used to perform vortex mixing operations on the transported test tubes.

[0008] Optionally, the transfer robotic arm includes, A support platform, which is arranged at one end of the machine body and extends to the outside. A rotary cylinder is horizontally arranged at the end extending to the outside, and a transition pipe is vertically arranged at the other end; And a lifting cylinder, which is vertically arranged on the rotary cylinder. A support plate is horizontally arranged at the upper end, and a transfer gripper is horizontally arranged at one end of the support plate away from the lifting cylinder, and When the transfer gripper holds the test tube and moves to one side of the transition pipe, the test tube can be inserted into the transition pipe.

[0009] Optionally, there are a pair of capping modules, and the pair of capping modules are arranged side by side.

[0010] Optionally, the rinsing and liquid adding module includes, A support frame, with a telescopic cylinder horizontally arranged at the upper end; A liquid extraction needle, which is vertically arranged, connected to the telescopic cylinder, can move along the Z direction by itself, and is arranged opposite to one of the capping modules, and is used to suck the liquid in the test tube at the corresponding capping module; And a liquid adding needle, which is vertically arranged, connected to the telescopic cylinder, and is arranged opposite to the other capping module, and is used to add liquid to the test tube at the corresponding capping module.

[0011] Optionally, the rinsing and liquid adding module further includes a rinsing tank located between the capping module and the liquid extraction needle; the rinsing tank includes a rinsing tank body and a rinsing pipe, and a liquid discharge port is communicated with the bottom of the rinsing tank body; The rinsing pipe is vertically arranged in the rinsing tank body, and a rinsing port is communicated with the bottom. During the process of the telescopic cylinder driving the liquid extraction needle to move horizontally, the liquid extraction needle can be communicated with the rinsing tank or be coaxially arranged with the rinsing pipe, and when it is coaxially arranged with the rinsing pipe, the liquid extraction needle can be inserted into the rinsing pipe for needle washing operation.

[0012] Optionally, the rinsing and liquid adding module further includes a waste liquid tank arranged between the liquid adding needle and the corresponding capping module, and during the process of the telescopic cylinder driving the liquid adding needle to move horizontally, the liquid adding needle can be communicated with the waste liquid tank.

[0013] Optionally, the nitrogen blowing module includes a nitrogen blowing support that can move in the Z direction and is equipped with a nitrogen blowing needle; and a nitrogen blowing table located below the nitrogen blowing support, which can rotate in the horizontal direction, is equipped with nitrogen blowing holes for placing test tubes, and the nitrogen blowing holes are used for the nitrogen blowing needle to insert.

[0014] Optionally, there are two groups of the nitrogen blowing holes, and the number of each group of nitrogen blowing holes is set corresponding to the number of nitrogen blowing needles, and when each group of nitrogen blowing holes moves below the nitrogen blowing needle, the nitrogen blowing needle can correspondingly insert into the test tubes arranged in the nitrogen blowing holes.

[0015] Optionally, a cover rack for placing tube caps is configured on the nitrogen blowing table.

[0016] Optionally, it further includes an unloading rack and a liquid taking and cleaning tank, the unloading rack is used for the liquid taking needle to unload the filter; the cleaning tank is used for the liquid taking needle to perform the needle cleaning operation.

[0017] In summary, by setting up a fully automatic nitrogen blowing and filtering device with multi-module linkage, on the basis of realizing the fully automatic nitrogen blowing concentration function, the automatic filtering of the sample solution and the automatic addition of the reconstitution solution are also realized, effectively improving the concentration and extraction efficiency of the sample solution. Description of the Drawings

[0018] Figure 1 is the overall structural schematic diagram of the embodiment of the present application; Figure 2 is Figure 1 the partial enlarged schematic diagram of area A in Figure 3 is the schematic diagram of the connection relationship between the cap screwing module, the rinsing and liquid adding module and the nitrogen blowing module in the embodiment of the present application.

[0019] Description of the reference numerals: 1, body; 11, unloading rack; 12, cleaning tank; 121, cleaning tank body; 122, cleaning pipe; 2, test tube rack; 3, transfer robotic arm; 31, support table; 311, rotating cylinder; 312, transition pipe; 32, lifting cylinder; 321, support plate; 3211, transfer gripper; 4, handling and liquid taking robotic arm; 41, handling arm; 42, liquid taking needle; 5, cap screwing module; 6, rinsing and liquid adding module; 61, support frame; 611, telescopic cylinder; 62, liquid pumping needle; 63, liquid adding needle; 64, rinsing tank; 65, waste liquid tank; 7, nitrogen blowing module; 71, nitrogen blowing support; 711, nitrogen blowing needle; 72, nitrogen blowing table; 721, nitrogen blowing hole; 722, cover rack; 8, vortex mixing module. Detailed Embodiments

[0020] To make the objectives, technical solutions and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions of the present invention in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are one embodiment of the present invention, rather than all embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present invention.

[0021] Unless otherwise defined, the technical terms or scientific terms used in the present invention should have the ordinary meaning understood by those of ordinary skill in the art to which the present invention pertains.

[0022] This embodiment provides a fully automatic nitrogen blowing and filtering device.

[0023] Referring to Figure 1 , a fully automatic nitrogen blowing and filtering device includes a body 1, a test tube rack 2, a transfer robotic arm 3, a handling and liquid-taking robotic arm 4, a capping module 5, a rinsing and liquid-adding module 6, a nitrogen blowing module 7, and a vortex mixing module 8.

[0024] The body 1 is used to carry and place the test tube rack 2, robotic arms, capping module 5, rinsing and liquid-adding module 6, nitrogen blowing module 7, vortex mixing module 8, etc.

[0025] The test tube rack 2 is configured with a tube rack for placing corresponding test tubes. The tube rack includes a sample injection bottle rack for placing sample injection bottles, a filter rack for placing filters, a centrifuge tube rack for placing centrifuge tubes, etc.

[0026] The transfer robotic arm 3 is used to receive the test tubes transported by the front-end processing equipment and transport the test tubes to the transition station.

[0027] The handling and liquid-taking robotic arm 4 is used to clamp and transport the test tubes from the transition station to the corresponding functional module stations, and / or clamp and transport the test tubes from one functional module station to another module functional station, and / or used to suck the liquid in the test tubes or add liquid to the test tubes.

[0028] The capping module 5 is used to clamp and fix the test tube body, and cooperate with the handling and liquid-taking robotic arm 4 to realize the opening and closing of the test tube.

[0029] The rinsing and liquid-adding module 6 is located adjacent to the capping module 5 station, and is used to add reconstitution solution or rinse the test tubes after the test tubes are opened.

[0030] The nitrogen blowing module 7 and the vortex mixing module 8 are respectively used to perform nitrogen blowing concentration operation and vortex mixing operation.

[0031] Referring to Figure 1, the transfer robotic arm 3 includes a support platform 31 and a lifting cylinder 32. The support platform 31 is arranged at one end of the machine body 1 and extends to the outside, and a rotary cylinder 311 is arranged at the end extending to the outside of the machine body 1, and a transition pipe 312 (i.e., the transition station) is vertically arranged at the other end; the lifting cylinder 32 is vertically arranged on the rotary cylinder 311, and the rotary cylinder 311 can drive the lifting cylinder 32 to rotate in the horizontal direction.

[0032] A support plate 321 is horizontally arranged at the upper end position of the lifting cylinder 32, and a transfer gripper 3211 is horizontally arranged at one end of the support plate 321 away from the lifting cylinder 32. When the rotary cylinder 311 drives the transfer gripper 3211 to move to one side of the transition pipe 312, the axis of the transfer gripper 3211 in the vertical direction can coincide with the axis of the transition pipe 312. When the transfer gripper 3211 grips the test tube and transports it to directly above the transition pipe 312 (i.e., the axis of the test tube coincides with the axis of the transition pipe 312), the lifting cylinder 32 drives the test tube to move downward, and the test tube is inserted into the transition pipe 312, and the test tube can be transported to the transition station.

[0033] Refer to Figure 1 、 Figure 2 , the handling and liquid-taking robotic arm 4 includes a handling arm 41 and a liquid-taking needle 42. The handling arm 41 is arranged above the machine body 1, equipped with a robotic arm that can move in the X, Y, and Z directions and a handling gripper arranged at the lower end of the robotic arm in the Z direction. The handling gripper and the robotic arm cooperate to transport the test tube to the corresponding module station.

[0034] The liquid-taking needle 42 is vertically arranged on the robotic arm in the Z direction and can move along the Z direction by itself to extend into the test tube to add liquid to the test tube or suck the liquid in the test tube; the liquid-taking needle 42 can also be detachably connected to the filter arranged on the test tube rack 2. In the specific implementation process, the two can be installed by plugging and tightly fitting.

[0035] An unloading rack 11 is arranged on the machine body 1, an unloading port for clamping the filter is arranged on the unloading rack 11, and a recycling bucket is arranged below the machine body 1 and is connected to and communicated with the unloading port.

[0036] When the liquid-taking needle 42 is connected to the filter, the liquid-taking needle 42 moves to above a filter with the robotic arm, and then the liquid-taking needle 42 moves downward and inserts into the filter, and the connection between the liquid-taking needle 42 and the filter can be realized; When disassembling the filter, the liquid-taking needle 42 moves to one side of the unloading rack 11 with the robotic arm and makes the filter embed into the unloading port. Subsequently, the liquid-taking needle 42 moves upward, the liquid-taking needle 42 is separated from the filter, and falls into the recycling bucket, and the disassembly of the filter can be realized.

[0037] The machine body 1 is also provided with a cleaning tank 12, which includes a cleaning tank body 121 and a cleaning pipe 122. A liquid discharge port for discharging waste liquid is communicated and arranged at the bottom of the cleaning tank body 121; the cleaning pipe 122 is vertically arranged in the cleaning tank body 121 for the liquid taking needle 42 to be inserted, and a cleaning port is communicated and arranged at its bottom to clean the outside of the liquid taking needle 42 when the liquid taking needle 42 is inserted into the cleaning pipe 122.

[0038] When the liquid taking needle 42 works, the liquid taking needle 42 is first connected to a pipetting injection pump to suck the sample solution or the reconstituted solution in the centrifuge tube, then connected to a filter, and finally the sucked solution is pushed into the sample bottle through the filter (if the sample bottle needs to be rinsed, only a small amount of solution needs to be added to the sample bottle first as a rinsing solution. After the rinsing and liquid adding module 6 extracts the rinsing solution later, the remaining solution is filtered and then enters the sample bottle as the final sample); subsequently, the liquid taking needle 42 is connected to a cleaning pump to clean the inside of the liquid taking needle 42, and cooperate with the cleaning tank 12 to achieve the overall cleaning of the inside of the liquid taking needle 42 and avoid cross contamination.

[0039] Refer to Figure 1 、 Figure 3 The capping module 5 is located at the next working station of the transfer robotic arm 3 and includes a clamping mechanism. The clamping mechanism adopts an airbag clamping method, which is a mature existing technology and will not be elaborated in this application. For the specific structure, reference can be made to Chinese Patent CN2024117352622.

[0040] There are a pair of capping modules 5, and the pair of capping modules 5 are respectively arranged corresponding to the rinsing unit and the liquid adding unit of the rinsing and liquid adding module 6. The capping module 5 corresponding to the rinsing unit is used to place the sample bottle, and the capping module 5 corresponding to the liquid adding unit is used to place the centrifuge bottle.

[0041] The rinsing and liquid adding module 6 is adjacent and opposite to the capping module 5, and includes a support frame 61, a liquid suction needle 62 and a liquid adding needle 63; the support frame 61 is vertically arranged above the machine body 1, and a telescopic cylinder 611 is horizontally arranged at the top.

[0042] The liquid suction needle 62 (i.e., the rinsing unit) is used to suck the liquid in the test tube at the corresponding capping module 5, is vertically arranged above the corresponding capping module 5 and is connected to the telescopic cylinder 611, and can move horizontally along with the telescopic cylinder 611. When the liquid suction needle 62 moves to the position above the corresponding capping module 5 along with the telescopic cylinder 611, the axis of the liquid suction needle 62 can coincide with the axis of the corresponding test tube, and at the same time, the liquid suction needle 62 itself can move along the Z direction to extend into the test tube to suck the liquid.

[0043] The liquid adding needle 63 (i.e., the liquid adding unit) is used to add the reconstitution solution into the test tube corresponding to the capping module 5. It is vertically arranged above the corresponding capping module 5 and connected to the telescopic cylinder 611. It can move horizontally along with the telescopic cylinder 611. When the liquid adding needle 63 moves to the position above the corresponding capping module 5 along with the telescopic cylinder 611, the axis of the liquid adding needle 63 can coincide with the axis of the corresponding test tube, so as to add the reconstitution solution into the test tube located at the corresponding capping module 5.

[0044] The rinsing and liquid adding module 6 further includes a rinsing tank 64 and a waste liquid tank 65. The rinsing tank 64 is located below the liquid pumping needle 62 and between the liquid pumping needle 62 and its corresponding capping module 5, and includes a rinsing tank body and a rinsing pipe.

[0045] The rinsing pipe is vertically arranged in the rinsing tank body, and a liquid discharge port is arranged at the bottom of the rinsing tank body for discharging waste liquid.

[0046] The rinsing pipe is used for the liquid pumping needle 62 to insert into it, and a rinsing port is communicated and arranged at its bottom to clean the outside of the liquid pumping needle 62 when the liquid pumping needle 62 is inserted. Combining with the self-cleaning function inside the liquid pumping needle 62, the complete cleaning of the liquid pumping needle 62 is realized, and the pollution between different sample liquids is avoided.

[0047] The liquid pumping needle 62 can be connected to a liquid pumping pump and a cleaning pump. In the specific implementation process, the liquid pumping needle 62 is first connected to the liquid pumping pump, and after pumping out the rinsing waste liquid in the corresponding test tube, the rinsing waste liquid is discharged into the rinsing tank body. Then it is connected to the cleaning pump to clean the inside of the liquid pumping needle 62. Then the liquid pumping needle 62 is inserted into the rinsing pipe, and water is sprayed from the air inlet to clean the outside of the liquid pumping needle 62, and finally the overall cleaning work of the liquid pumping needle 62 is completed.

[0048] The waste liquid tank 65 is located below the liquid adding needle 63 and between the liquid adding needle 63 and its corresponding capping module 5. The liquid adding needle 63 is connected to a reconstitution plunger pump, and the reconstitution plunger pump is connected to multiple containers for placing reconstitution solutions through a multi-way switching valve to realize the addition of several kinds of reconstitution solutions.

[0049] In the specific implementation process, when adding a certain reconstitution solution, the reconstitution plunger pump is connected to the corresponding container through the multi-way switching valve. The liquid adding needle 63 moves above the waste liquid tank 65 to empty the liquid, and then continues to move above the test tube at the opposite capping module 5 to add the reconstitution solution.

[0050] Refer to Figure 1 、 Figure 3 As shown in

[0051] The nitrogen blowing platform 72 is arranged below the nitrogen blowing support 71 and can rotate horizontally. It is configured with nitrogen blowing holes 721 for placing test tubes. When the nitrogen blowing platform 72 rotates horizontally by a certain angle, the nitrogen blowing needle 711 can be inserted into the nitrogen blowing hole 721.

[0052] In the specific implementation process, in order to improve the utilization efficiency of the nitrogen blowing module 7, multiple nitrogen blowing needles 711 can be provided, and multiple nitrogen blowing holes 721 are also provided, and the number of nitrogen blowing holes 721 is set corresponding to the number of nitrogen blowing needles 711.

[0053] Furthermore, when conditions permit, multiple groups (N≥2) of nitrogen blowing holes 721 can also be provided to perform nitrogen blowing work during the time intervals of other operations to ensure the nitrogen blowing efficiency. That is, when the device is working, multiple centrifuge tubes can be transported to the nitrogen blowing module 7 first, and then other operations can be carried out.

[0054] A cover rack 722 for placing tube caps is arranged on the nitrogen blowing platform 72. The cover rack 722 is used to place the caps of sample injection bottles and / or centrifuge tubes. In a preferred embodiment, two groups of nitrogen blowing holes 721 can be provided, and the two groups of nitrogen blowing holes 721 are symmetrically distributed on the nitrogen blowing platform 72. A cover rack 722 corresponding to the number of nitrogen blowing holes 721 is arranged between the two groups of nitrogen blowing holes 721; In the specific implementation process, a cover rack 722 for placing centrifuge tube caps can be arranged on the nitrogen blowing platform 72, and a cover rack 722 for placing the caps of inlet gas bottles can be arranged on the sample injection bottle rack, so as to separately place the centrifuge tube caps and the caps of inlet gas bottles, thereby reducing the software programming difficulty in the actual implementation process.

[0055] The vortex mixing module 8 is located at the next working station of the rinsing and liquid adding module 6, which is a mature existing technology and will not be elaborated in this application. The specific structure can refer to Chinese Patent CN2021106214057.

[0056] The working steps of a full-automatic nitrogen blowing and filtering device according to an embodiment of this application are as follows: 1. The transfer robotic arm 3 transports the centrifuge tubes conveyed by the front-end pre-treatment equipment to the transition station (i.e., the transition tube 312), and the handling and liquid-taking robotic arm 4 transports the centrifuge tubes to the capping module 5 for uncapping operation; 2. After uncapping, the centrifuge tubes are transported to the nitrogen blowing module 7 for nitrogen blowing and concentration operation, then transported to the liquid adding unit to add the reconstitution solution, and after capping, transported to the vortex mixing module 8 for mixing treatment; 3. After the centrifuge tubes are uncapped, the liquid-taking needle 42 sucks the sample liquid, connects the filter, transports the sample bottle to the rinsing unit for uncapping and rinsing operation. When rinsing in the rinsing unit, the centrifuge tubes are capped and transported to the centrifuge tube rack, and then the liquid-taking needle 42 adds the sample liquid into the sample bottle; 4. The sample bottle is capped and transported to the sample bottle rack for storage; 5. Discard the filter and clean the needle (i.e., clean the liquid extraction needle 42 and the liquid suction needle 62).

[0057] It should be noted that in the actual implementation process, the above working steps or working order can be adjusted according to actual needs.

[0058] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A fully automatic nitrogen blowing filtration device, characterized in that: include, Body (1); A test tube rack (2), which is equipped with a tube rack for placing corresponding test tubes, including a sample injection bottle rack, a filter rack, a centrifuge tube rack, etc.; The transfer robot arm (3) is used to receive the test tubes delivered by the front-end pre-processing equipment and transport the test tubes to the transition station; The liquid collection robot arm (4) comprises a carrying arm (41) and a liquid collection needle (42); the carrying arm (41) is arranged above the machine body (1), and is provided with a robot arm that can move in the X, Y and Z directions and a carrying clamp for clamping a test tube, and is used to clamp and transport the test tube to a corresponding workstation; the liquid collection needle (42) is arranged on the Z-direction robot arm, and can move in the Z direction, and is used to absorb liquid in the test tube or add liquid to the test tube; A capping module (5) cooperates with the liquid handling and liquid collection robot arm (4) to open and close the cap of the test tube; a rinsing and liquid adding module (6), arranged adjacent to the cap screwing module (5), and used for absorbing liquid in the test tube located at the cap screwing module (5) and / or adding liquid to the test tube located at the cap screwing module (5); A nitrogen blowing module (7) is used to perform nitrogen blowing and concentration operation on the transported test tubes; and a vortex mixing module (8), located at the next station of the nitrogen blowing module (7), for performing a vortex mixing operation on the delivered test tube.

2. A fully automatic nitrogen blowing filtration device according to claim 1, characterized in that: The transfer robot arm (3) comprises: A support platform (31) is arranged at one end of the machine body (1) and extends to the outside, a rotating cylinder (311) is horizontally arranged at one end extending to the outside, and a transition pipe (312) is vertically arranged at the other end; and a lifting cylinder (32) vertically arranged on the rotating cylinder (311), with a support plate (321) horizontally arranged on the upper end, and a transfer clamp (3211) horizontally arranged on one end of the support plate (321) away from the lifting cylinder (32), and When the transfer clamp (3211) clamps the test tube and moves to one side of the transition tube (312), the test tube can be inserted into the transition tube (312).

3. A fully automatic nitrogen blowing filtration device according to claim 1, characterized in that: A pair of the capping modules (5) are provided, and the pair of the capping modules (5) are arranged side by side.

4. A fully automatic nitrogen blowing filtration device according to claim 3, characterized in that: The rinsing and liquid adding module (6) comprises: A support frame (61) having a telescopic cylinder (611) horizontally disposed at the upper end; A liquid extraction needle (62), which is arranged vertically, connected to the telescopic cylinder (611), can move along the Z direction, is arranged opposite to one of the cap screwing modules (5), and is used to extract liquid in the test tube corresponding to the cap screwing module (5); and a liquid adding needle (63), which is vertically arranged, connected to the telescopic cylinder (611), and arranged opposite to another cap screwing module (5), and is used for adding liquid into the test tube corresponding to the cap screwing module (5).

5. A fully automatic nitrogen blowing filtration device according to claim 4, characterized in that: The rinsing and liquid adding module (6) further comprises a rinsing tank (64) located between the cap screwing module (5) and the liquid extraction needle (62); the rinsing tank (64) comprises a rinsing tank (64) body and a rinsing pipe, and a liquid discharge port is provided at the bottom of the rinsing tank (64) body; The rinse tube is vertically arranged in the rinse tank (64) and is connected to a rinse port at the bottom. When the telescopic cylinder (611) drives the liquid extraction needle (62) to move in the horizontal direction, the liquid extraction needle (62) can be connected to the rinse tank (64) or coaxially arranged with the rinse tube. When coaxially arranged with the rinse tube, the liquid extraction needle (62) can be inserted into the rinse tube to perform needle washing operations.

6. A fully automatic nitrogen blowing filtration device according to claim 4, characterized in that: The rinsing and liquid adding module (6) further comprises a waste liquid tank (65) arranged between the liquid adding needle (63) and the corresponding cap screwing module (5), and when the telescopic cylinder (611) drives the liquid adding needle (63) to move in the horizontal direction, the liquid adding needle (63) can be connected to the waste liquid tank (65).

7. The fully automatic nitrogen blowing filtration device according to claim 1 is characterized in that: The nitrogen blowing module (7) comprises: A nitrogen blowing support (71) is movable along the Z direction and is provided with a nitrogen blowing needle (711); and a nitrogen blowing platform (72), which is located below the nitrogen blowing support (71), can rotate in the horizontal direction, and is provided with a nitrogen blowing hole (721) for placing a test tube, and the nitrogen blowing hole (721) is used for inserting the nitrogen blowing needle (711).

8. A fully automatic nitrogen blowing filtration device according to claim 7, characterized in that: The nitrogen blowing holes (721) are provided in two groups, and the number of the nitrogen blowing holes (721) in each group is provided corresponding to the number of the nitrogen blowing needles (711), and When each group of nitrogen blowing holes (721) moves to below the nitrogen blowing needle (711), the nitrogen blowing needle (711) can be correspondingly inserted into a test tube arranged in the nitrogen blowing hole (721).

9. A fully automatic nitrogen blowing filtration device according to claim 7 or 8, characterized in that: The nitrogen blowing station (72) is provided with a cover rack (722) for placing tube covers.

10. The fully automatic nitrogen blowing filtration device according to claim 1, characterized in that: It also includes an unloading rack (11) and a liquid taking and cleaning tank (12), The unloading rack (11) is used for the liquid collection needle (42) to unload the filter; The cleaning tank (12) is used for washing the liquid collection needle (42).

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