A combined laboratory pipetting device

Abstract

The application discloses a combined laboratory pipetting device, and relates to the field of laboratory pipetting, which comprises a base, a frame, a suction head and a pipetting assembly. The top of the base is provided with a reagent groove. One side of the reagent groove is provided with a liquid agent box, and the other side is provided with a suction head box. The frame is rotatably provided with a fixed gear matched with the pipetting assembly. A clamping plate matched with the fixed gear is slidably arranged in the reagent groove. A plurality of through grooves for clamping the suction head are formed in the suction head box. A jacking plate is slidably arranged in the vertical direction at the bottom of the suction head box. Through the cooperation of the bidirectional threaded rod and the threaded sleeve, the clamping plate in the reagent groove is driven to limit and clamp the outer wall of the test tube rack, so that the suction head is prevented from accidentally colliding with the outer wall of the test tube when the pipetting assembly and the suction head are used for pipetting each time. After the pipetting is completed, the threaded sleeve drives the jacking plate to move upward, and the elastic clamping mechanism is released to limit the suction head.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of laboratory pipetting, in particular to a combined laboratory pipetting device. BACKGROUND

[0002] The pipette, also known as a pipetting gun, is a device for quantitative transfer of liquid. In the analysis and testing research, a pipette is generally used to take a small amount or micro amount of liquid. The pipette can be divided into a gas piston type pipette and an external piston type pipette according to the principle. The gas piston type pipette is mainly used for standard pipetting, and the external piston type pipette is mainly used for processing special liquids such as volatile, corrosive and viscous liquids. It is widely used in chemical, microbiological and other related detection laboratories.

[0003] The existing laboratory pipetting device uses a pipetting gun when facing a small amount of pipetting. In use, the suction head is clamped into the end of the pipetting gun, and then the suction head is inserted into the liquid to be pipetted for extraction. After a certain amount of liquid is extracted, it is discharged into the pipetting test tube in a quantitative manner. This working method can ensure the pipetting efficiency when facing a single pipetting workload, but when facing pipetting analysis and testing of mixed liquids, the worker needs to extract one kind of liquid and discharge it into the test tube one by one. Then the suction head at the end of the pipetting gun is pulled out, the suction head is reinstalled, and another kind of liquid is extracted and pipetted. Manual operation greatly affects the overall work efficiency and increases the work burden of the experimental personnel. Although the automatic pipetting device solves the above problems, in the process of pipetting, in order to prevent the suction head from accidentally touching the outer wall of the reagent tube and causing cross contamination, the stability of the reagent tube disc needs to be ensured. It usually adopts a fixed clamping method, and the suction head holder and the suction head are connected by clamping to ensure the stability of the installation between the pipetting assembly and the suction head. However, this fixed method is time-consuming and labor-intensive when disassembled, and the suction head of the automatic pipetting device is placed in the suction head holder after use. When pipetting different solutions, the suction head needs to be replaced frequently. At this time, different solutions may be left in different suction heads. When the worker manually replaces the suction head in the suction head holder, it is difficult for the worker to disassemble and replace the suction head due to the clamping type setting between the suction head disc and the suction head, thereby affecting the subsequent pipetting efficiency.

[0004] In summary, the automatic pipetting is time-consuming and labor-intensive when disassembling the reagent tube disc, and the worker has difficulty in replacing the used suction head, which greatly affects the overall work efficiency and increases the work burden of the experimental personnel. SUMMARY

[0005] Based on this, the purpose of the present application is to provide a combined laboratory pipetting device to solve the problem of wasting manpower and resources when disassembling the reagent tube disc later, and the difficulty of replacing the used suction head for the staff, which greatly affects the overall work efficiency and increases the work burden of the experimental personnel.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solution: a combined laboratory pipetting device, comprising a base, a frame, a suction head and a pipetting assembly, the pipetting assembly is located in the frame and can slide, the top of the base is provided with a reagent tank, one side of the reagent tank is provided with a liquid agent box, and the other side is provided with a suction head box, the frame is rotatably provided with a gear rack matched with the pipetting assembly, and a clamping plate matched with the gear rack is slidably arranged in the reagent tank.

[0007] A plurality of through grooves for clamping the suction head are formed on the suction head box, and an elastic limiting mechanism is arranged in the through groove, and a jacking plate is slidably arranged on the bottom of the suction head box in the vertical direction, and a threaded sleeve is connected to the bottom of the jacking plate.

[0008] By adopting the above technical scheme, the gear rack is driven to rotate under the action of the toothed rod, and the clamping plate in the reagent tank is driven to limit and clamp the outer wall of the test tube rack under the cooperation of the bidirectional threaded rod and the threaded sleeve. In this process, it is ensured that the test tube rack will not be displaced during pipetting, and it is ensured that the suction head will not accidentally touch the outer wall of the test tube during pipetting with the suction head each time. After pipetting is completed, the threaded sleeve drives the jacking plate to move upward when the clamping plate releases the limiting of the test tube rack, the used suction head is jacked up as a whole, the limiting of the suction head by the elastic clamping mechanism is released, and the suction head in the suction head box is convenient for the staff to replace.

[0009] The present application further provides that the bottom of the liquid agent box and the bottom of the suction head box are respectively provided with a stepping motor and a driving assembly, the liquid agent box and the suction head box can rotate on the base, a plurality of liquid agent grooves are formed on the liquid agent box, the liquid agent grooves are used to store different liquid agents, and the suction head box is provided with through grooves corresponding to the liquid agent grooves.

[0010] As a preferred, when multiple liquids are pipetted in the test tube rack at one time, a group of liquid agents corresponds to a suction head under the action of the stepping motor at the bottom of the liquid agent box and the driving assembly at the bottom of the suction head box, the pipetting assembly corresponds to different liquid agents and suction heads when the liquid agent box and the suction head box rotate at the same time, the suction head is convenient for replacement, another group of liquid agents is extracted at the same time, and the X-axis transmission assembly and the Z-axis transmission assembly only need to be picked up at the specified position each time, which reduces the driving steps of the whole pipetting assembly and reduces the overall driving cost.

[0011] The frame is further provided with a Z-axis transmission assembly, the output end of the Z-axis transmission assembly penetrates into the frame and is connected with the X-axis transmission assembly, and a pipetting assembly is arranged on the X-axis transmission assembly and slides.

[0012] Preferably, the pipetting assembly can realize the extraction of multiple groups of liquid agents into test tubes at one time through the cooperation of the X-axis transmission assembly and the Z-axis transmission assembly, so as to reduce the overall work burden and improve the pipetting efficiency of the device when facing a large amount of liquid agent.

[0013] The frame is further provided with a Z-axis transmission assembly, the output end of the Z-axis transmission assembly penetrates into the frame and is connected with the X-axis transmission assembly, and a pipetting assembly is arranged on the X-axis transmission assembly and slides.

[0014] Preferably, the cooperation of the sliding groove and the sliding block facilitates the stability of the sliding of the X-axis transmission assembly in the frame, so that the X-axis transmission assembly slides in the vertical direction of the inner wall of the frame.

[0015] The frame is further provided with a Z-axis transmission assembly, the output end of the Z-axis transmission assembly penetrates into the frame and is connected with the X-axis transmission assembly, and a pipetting assembly is arranged on the X-axis transmission assembly and slides.

[0016] Preferably, during the movement of the X-axis transmission assembly and the pipetting assembly, the tooth bar rotates the side gear, the gear wheel rotates the bidirectional threaded rod, and the threaded sleeve drives the clamping plate to slide in the reagent groove, so as to complete the limiting and opening of the test tube rack.

[0017] The frame is further provided with a Z-axis transmission assembly, the output end of the Z-axis transmission assembly penetrates into the frame and is connected with the X-axis transmission assembly, and a pipetting assembly is arranged on the X-axis transmission assembly and slides.

[0018] Preferably, the flexible protective sleeve prevents the clamping plate from directly contacting the outer wall of the test tube rack, reduces the wear of the outer wall of the test tube rack during clamping, improves the practicability of the device, and facilitates the regular disassembly and replacement of the flexible protective sleeve by the worker.

[0019] The frame is further provided with a Z-axis transmission assembly, the output end of the Z-axis transmission assembly penetrates into the frame and is connected with the X-axis transmission assembly, and a pipetting assembly is arranged on the X-axis transmission assembly and slides.

[0020] As preferably, when the bidirectional threaded rod rotates under the action of the gear, the spur gear on the outer wall of the bidirectional threaded rod drives the side spur gear on one side to rotate, so that the worm on one end of the side spur gear rotates, and the worm gear is driven to rotate, thereby driving the unidirectional threaded rod at the top to rotate, so that the threaded sleeve drives the jacking plate at the top to slide vertically, facilitating subsequent jacking of the suction head.

[0021] The application further provides that the elastic limiting mechanism in the suction head box is an elastic plastic sheet.

[0022] As preferably, the plastic elastic sheet is made of polyethylene material, which is light in structure and has high acid and alkali resistance, facilitating clamping and limiting the used suction head to prevent the residual liquid in the suction head from splashing and leaking due to vibration.

[0023] The application further provides that the outer wall of the threaded sleeve is provided with a limiting mechanism, and the limiting mechanism cooperates with the base.

[0024] As preferably, the threaded sleeve does not rotate during the rotation of the unidirectional threaded rod under the action of the limiting mechanism, further improving the stability of the threaded sleeve sliding vertically in the base.

[0025] The application further provides that the bottom of the reagent tank is provided with a plurality of micro convexities, and the outer surfaces of the micro convexities are rough.

[0026] As preferably, the micro convexities improve the stability of the test tube rack placed in the reagent tank, and the rough setting increases the sliding friction between the reagent tank and the test tube rack, further improving the stability of the test tube rack.

[0027] In summary, the application has the following advantages:

[0028] 1、The application sets the reagent tank on the top of the base, places the test tube rack to be pipetted in the reagent tank, and then cooperates the X-axis transmission assembly and the Z-axis transmission assembly to realize the extraction of multiple groups of liquid reagents into the test tube at a time, thereby reducing the overall work burden when facing a large amount of liquid reagent pipetting work, improving the overall pipetting efficiency of the device, and realizing one type of suction head corresponding to one group of liquid reagent under the action of the stepping motor at the bottom of the liquid reagent box and the driving assembly at the bottom of the suction head box, so that the X-axis transmission assembly and the Z-axis transmission assembly only need to pick up at the specified position each time, reducing the driving steps of the overall pipetting assembly and reducing the overall driving cost.

[0029] 2. This invention features a sliding clamp in the reagent tank. As the pipetting assembly moves the pipette tip downwards, the geared rod drives the fixed gear to rotate. With the cooperation of the bidirectional threaded rod and the threaded sleeve, the clamp inside the reagent tank clamps the outer wall of the test tube rack. This ensures that the test tube rack does not shift position during pipetting, preventing the pipette tip from accidentally hitting the outer wall of the test tube and reducing the risk of cross-contamination. When the pipetting assembly slides upwards to reset, the fixed gear rotates in the opposite direction, releasing the clamp from its clamping action on the test tube rack, allowing staff to easily remove the test tube rack.

[0030] 3. This invention features a bevel gear transmission assembly on the outer wall of a bidirectional threaded rod. The bevel gear transmission assembly, in conjunction with a worm gear, drives the threaded sleeve to slide up and down. When the pipetting assembly moves upward to connect with the pipette tip, the lifting plate initially supports the bottom of the tip. Simultaneously, the elastic locking mechanism within the tip box ensures the tip is positioned at a designated location within the box, guaranteeing stable insertion of the tip into the output end of the pipetting assembly. After pipetting is completed, when the clamp releases the test tube rack's limit, the threaded sleeve drives the lifting plate upward, lifting the used tip and releasing the elastic locking mechanism's limit, facilitating subsequent replacement of the tip within the tip box. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the suction head in the lifted state of the present invention;

[0032] Figure 2 This is a perspective view of the present invention;

[0033] Figure 3 For the present invention Figure 1 Enlarged view of A in the middle;

[0034] Figure 4 This is the front view of the present invention;

[0035] Figure 5 This is a schematic diagram of the transmission mechanism structure of the present invention;

[0036] Figure 6 This is a schematic diagram of the structure of the suction head of the present invention in the inserted state;

[0037] Figure 7 This is a schematic diagram of the liquid container structure of the present invention;

[0038] Figure 8 This is a side perspective view of the transmission mechanism of the present invention;

[0039] Figure 9 For the present invention Figure 8 Enlarged view of B in the middle;

[0040] Figure 10 Figure 1 is a schematic view of the pipette tip box structure of the present application.

[0041] Reference signs:

[0042] 1, base; 2, frame; 3, Z-axis transmission assembly; 4, liquid box; 5, pipette tip box; 6, pipette tip; 7, reagent tank; 8, pipetting assembly; 9, X-axis transmission assembly; 10, clamping plate; 11, threaded sleeve; 12, bidirectional threaded rod; 13, sliding groove; 14, rack; 15, gear; 16, spur gear; 17, side bevel gear; 18, worm; 19, lifting plate; 20, threaded sleeve; 21, one-way threaded rod; 22, worm gear; 23, liquid tank; 24, stepper motor. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0044] The embodiments of the present application will be described below according to the overall structure of the present application.

[0045] Embodiment one: please refer to Figures 1-10 The combined laboratory pipetting device shown in the figure includes a base 1, a frame 2, a Z-axis transmission assembly 3, an X-axis transmission assembly 9, a pipette tip 6, a transmission mechanism, a clamping mechanism and a lifting mechanism. The reagent tank 7 is arranged on the top of the base 1. One side of the reagent tank 7 is provided with a liquid box 4, and the other side is provided with a pipette tip box 5. A plurality of through grooves for clamping the pipette tip 6 are formed on the pipette tip box 5. An elastic limiting mechanism is arranged in the through groove. The worker clamps the pipette tip 6 into the pipette tip box 5, and then drives the pipetting assembly 8 to move to the top of the pipette tip box 5 under the action of the Z-axis transmission assembly 3 and the X-axis transmission assembly 9. The pipetting assembly 8 is driven to slide downward by the Z-axis transmission assembly 3, so that the pipette tip 6 is stably connected to the output end of the pipetting assembly 8. Then the X-axis transmission assembly 9 drives the pipetting assembly 8 and the pipette tip 6 to move to the top of the liquid box 4, and a certain amount of liquid is extracted by the pipette tip 6, which is convenient for subsequent pipetting work.

[0046] The staff will place the test tube rack in the reagent tank 7 at this time, and then the X-axis transmission assembly 9 drives the pipette assembly 8 and the suction head 6 to move to the top of the reagent tank 7. Since the rack 14 meshing with the gear 15 is arranged on one side of the X-axis transmission assembly 9 in the frame 2, the rack 14 slides downward under the action of the Z-axis transmission assembly 3, driving the gear on one side to rotate. One end of the gear 15 is connected with the bidirectional threaded rod 12, and the threaded sleeve 11 is arranged on the outer wall of the bidirectional threaded rod 12 in a sliding manner. The top of the threaded sleeve 11 is connected with the clamping plate 10. In the process of rotating the gear 15, the bidirectional threaded rod 12 will rotate following the gear 15. The clamping plate 10 limits and clamps the outer wall of the test tube rack through the action of the threaded sleeve 11, so that the test tube rack will not deviate from its position during pipetting. The suction head 6 will not accidentally touch the outer wall of the test tube, reducing the risk of cross contamination.

[0047] After the pipetting is completed through the cooperation of the pipette assembly 8 and the suction head 6, the Z-axis transmission assembly 3 drives the pipette assembly 8 to slide upward. The rack 14 drives the gear 15 to rotate in the opposite direction. At this time, the clamping plate 10 releases the limiting and clamping of the test tube rack, so that the staff can take out the test tube rack in time. The outer wall of the bidirectional threaded rod 12 is provided with a spur gear 16. The spur gear 16 is meshed with a side bevel gear 17 on one side. One end of the side bevel gear 17 is connected with a worm 18. When the bidirectional threaded rod 12 rotates through the gear 15, the spur gear 16 on the outer wall will drive the side bevel gear 17 on one side to rotate, so that the worm 18 at one end of the side bevel gear 17 rotates. The side of the worm 18 is meshed with a worm wheel 22. The top of the worm wheel 22 is connected with a one-way threaded rod 21, and the one-way threaded rod 21 is in threaded connection with a threaded sleeve 20. The one-way threaded rod 21 at the top is driven to rotate through the cooperation of the worm 18 and the worm wheel 22, so that the threaded sleeve 20 drives the top lifting plate 19 to slide upward, and the suction head 6 after use is lifted as a whole, and the elastic clamping mechanism is released to limit the suction head, so that the staff can replace the suction head 6.

[0048] The Z-axis transmission assembly 3, the X-axis transmission assembly 9 and the pipette assembly 8 are all prior art for those skilled in the art, so they are not described in detail in this application. During the process of rotating the gear 15 to clamp the test tube with the clamping plate 10, the lifting plate 19 will slowly slide downward to the lowest state. Since the suction head box 5 is provided with a groove matched with the top end of the suction head 6, the suction head 6 will not be separated from the suction head box 5 during the process of sliding downward of the lifting plate 19.

[0049] In the above embodiment, please refer to Figure 5The inner wall of the clamping plate 10 is provided with a flexible protective sleeve, which is detachably arranged between the clamping plate 10 and the flexible protective sleeve. The flexible protective sleeve can prevent the clamping plate 10 from directly contacting the outer wall of the test tube rack, reduce the wear of the clamping plate 10 on the outer wall of the test tube rack during clamping, improve the practicability of the device as a whole, and facilitate the regular disassembly and replacement of the flexible protective sleeve by the staff.

[0050] In the above embodiment, please refer to Figure 2 and Figure 10 The elastic limiting mechanism in the suction head box 5 is made of an elastic plastic sheet, which is inclined in the suction head box and made of polyethylene material. The elastic plastic sheet is light in structure, has high acid and alkali resistance, can clamp the used suction head 6, prevent the residual liquid in the suction head 6 from splashing and leaking due to vibration, and the side wall of the frame 2 is provided with a sliding groove 13. The X-axis transmission assembly 9 is provided with a sliding block matched with the sliding groove 13. The sliding groove 13 and the sliding block cooperate to stabilize the sliding of the X-axis transmission assembly 9 in the frame 2, so that the X-axis transmission assembly 9 slides in the vertical direction of the inner wall of the frame 2.

[0051] Embodiment two: please refer to Figure 7 and Figure 10 The bottom of the liquid box 4 and the suction head box 5 is respectively provided with a stepping motor 24 and a driving assembly, so that the liquid box 4 and the suction head box 5 can rotate on the base 1. The liquid box 4 is provided with a plurality of liquid grooves 23, which are used to store different liquids. The suction head box 5 is provided with a through groove corresponding to the liquid groove 23. When multiple liquids are transferred in the test tube rack at one time, the stepping motor 24 at the bottom of the liquid box 4 and the driving assembly at the bottom of the suction head box 5 are used to realize one group of liquid corresponding to one suction head. When the liquid box 4 and the suction head box 5 rotate at the same time, the liquid transfer assembly 8 corresponds to different liquids and suction heads 6, so that the suction head 6 can be replaced, and another group of liquid can be extracted at the same time. The X-axis transmission assembly 9 and the Z-axis transmission assembly 3 only need to be picked up at the specified position each time, which reduces the driving steps of the liquid transfer assembly 8 and reduces the driving cost.

[0052] In the specific work, when in use, the staff places the test tube rack to be pipetted in the reagent groove 7, then drives the pipetting assembly 8 to the top of the suction head box 5 through the cooperation of the X-axis transmission assembly 9 and the Z-axis transmission assembly 3, then drives the pipetting assembly 8 to slide downward through the Z-axis transmission assembly 3, in the process, the output end of the pipetting assembly 8 is in close contact with the suction head 6 and is installed, and the X-axis transmission assembly 9 moves the pipetting assembly 8 and the suction head 6 to the top of the liquid agent box 4, the suction head 6 cooperates with the pipetting assembly 8 to quantitatively extract the liquid agent in the liquid agent box 4, then moves to the top of the test tube rack under the action of the X-axis transmission assembly 9, at this time, the Z-axis transmission assembly 3 drives the pipetting assembly 8 to slide downward, the rack gear 15 is driven to rotate through the toothed rod 14, and the clamping plate 10 drives the test tube rack to be clamped and limited through the cooperation of the two-way threaded rod 12 and the threaded sleeve 11, so that the suction head 6 is prevented from accidentally touching the outer wall of the test tube during pipetting by the pipetting assembly 8 and the suction head 6 each time, and the suction head 6 is replaced after each pipetting of the liquid agent, and the used suction head is placed in the suction head box 5 again;

[0053] Meanwhile, the elastic clamping mechanism is arranged in the suction head box 5, which facilitates the stable connection of the suction head with the output end of the pipetting assembly 8 during the downward movement of the pipetting assembly 8, after the pipetting of the test tube rack is completed, the pipetting assembly 8 is slid upward to reset through the Z-axis transmission assembly 3, the rack gear 15 is reversed under the action of the toothed rod 14, the clamping plate 10 releases the clamping work on the outer wall of the test tube rack, which facilitates the staff to quickly take out and replace the test tube rack, and the worm 18 is driven to rotate under the meshing of the bevel gear, and the upward sliding of the jacking plate 19 is facilitated through the cooperation of the worm wheel 22 on one side and the one-way threaded rod 21, at this time, the used suction head 6 in the suction head box 5 breaks through the limit of the elastic mechanism and is lifted upward, so that the staff can replace the suction head 6 in the suction head box 5, reduce the overall work burden, and improve the pipetting efficiency of the whole device.

[0054] Although the embodiments of the present application have been shown and described, the specific embodiments are only an explanation of the present application, and are not a limitation of the application, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner, and those skilled in the art can make modifications, replacements and variations of the embodiments without creative contribution after reading the specification without departing from the principles and purposes of the present application, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A combined laboratory pipetting device comprising a base (1), a frame (2), a tip (6) and a pipetting assembly (8), which is slidable in the frame (2), characterized in that: The top of the base (1) is provided with a reagent tank (7), wherein one side of the reagent tank (7) is provided with a liquid agent box (4), and the other side is provided with a suction head box (5), the frame (2) is rotatably provided with a gear (15) matched with the pipetting assembly (8), wherein the reagent tank (7) is slidably provided with a clamping plate (10) matched with the gear (15); A plurality of through grooves for clamping the suction heads (6) are formed on the suction head box (5), wherein the through grooves are provided with elastic limiting mechanisms, the bottom of the suction head box (5) is slidably provided with a jacking plate (19) in the vertical direction, wherein the bottom of the jacking plate (19) is connected with a threaded sleeve (20), the threaded sleeve (20) is driven to displace by the gear (15), the bottom of the liquid agent box (4) is provided with a stepping motor (24), the bottom of the suction head box (5) is provided with a driving assembly, the liquid agent box (4) and the suction head box (5) can rotate on the base (1), a plurality of liquid agent grooves (23) are formed on the liquid agent box (4), the liquid agent grooves (23) are used to store different liquid agents, and the suction head box (5) is provided with through grooves corresponding to the liquid agent grooves (23); The top of the frame (2) is provided with a Z-axis transmission assembly (3), the output end of the Z-axis transmission assembly (3) penetrates into the frame (2) and is connected with an X-axis transmission assembly (9), and the X-axis transmission assembly (9) is slidably provided with a pipetting assembly (8), the side wall of the frame (2) is provided with a sliding groove (13), wherein the X-axis transmission assembly (9) is provided with a sliding block matched with the sliding groove (13), one side of the X-axis transmission assembly (9) in the frame (2) is provided with a tooth rod (14) engaged with the gear (15), one end of the gear (15) is connected with a bidirectional threaded rod (12), a threaded sleeve (11) is slidably arranged on the outer wall of the bidirectional threaded rod (12), and the top of the threaded sleeve (11) is connected with the clamping plate (10), the elastic limiting mechanism in the suction head box (5) is formed by an elastic plastic sheet, and the elastic plastic sheet is arranged obliquely in the suction head box (5).

2. A combined laboratory pipetting device according to claim 1, characterized in that The inner wall of the clamping plate (10) is provided with a flexible protective sleeve, and the flexible protective sleeve and the clamping plate (10) are detachably arranged.

3. The combination laboratory pipetting device of claim 1, wherein: The outer wall of the bidirectional threaded rod (12) is provided with a spur gear (16), a side bevel gear (17) is engaged on one side of the spur gear (16), one end of the side bevel gear (17) is connected with a worm (18), one side of the worm (18) is engaged with a worm wheel (22), the top of the worm wheel (22) is connected with a one-way threaded rod (21), and the one-way threaded rod (21) is threadedly connected with the threaded sleeve (20).

4. A modular laboratory pipetting device according to claim 3, wherein: The outer wall of the threaded sleeve (20) is provided with a limiting mechanism, and the limiting mechanism is matched with the base (1).

5. The modular pipetting apparatus of claim 1, wherein: The bottom of the reagent tank (7) is provided with a plurality of micro protrusions, and the outer surfaces of the micro protrusions are all provided in a rough shape.

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