Pipette pump

Abstract

The present application provides a pipetting pump, comprising: a channel module in which a plurality of mutually independent pipetting channels are formed; the plunger module comprises a plurality of plungers, the plurality of plungers are in one-to-one correspondence with the plurality of pipetting channels, and each plunger is movably connected into the corresponding pipetting channel; the driving module comprises a driving assembly, a transmission assembly and a connecting assembly, the transmission assembly is connected with the driving assembly and the connecting assembly, the connecting assembly is connected with the channel module and the plunger module, and the transmission assembly and the connecting assembly are used for driving the channel module and the plunger module to rotate under driving of the driving assembly. And the rotary motion is converted into linear motion so as to drive each plunger to translate in the corresponding pipetting channel, so that the plurality of pipetting channels generate negative pressure to suck liquid or extrude air in the plurality of pipetting channels to discharge liquid.

Description

Technical Field

[0001] This application relates to the field of liquid reagent transfer technology, and more particularly to a pipette pump. Background Technology

[0002] In in vitro diagnostic medical devices, pipette arms are used to dispense liquids such as samples and reagents, and the core component for achieving precise liquid dispensing is the pipette pump. Pipettes are usually used in conjunction with reaction plates to perform pipetting operations, but currently, the pipette pump channels do not match the reaction plate well positions, resulting in low pipetting efficiency. Utility Model Content

[0003] This application provides a pipetting pump, comprising: a channel module having multiple independent pipetting channels; a plunger module including multiple plungers, each plunger corresponding to one of the multiple pipetting channels, each plunger being movably connected to its corresponding pipetting channel; and a drive module including a drive assembly, a transmission assembly, and a connecting assembly, the transmission assembly being connected to the drive assembly and the connecting assembly, and the connecting assembly being connected to the channel module and the plunger module. The transmission assembly and the connecting assembly are used to convert rotational motion into linear motion under the drive of the drive assembly, thereby driving each plunger to translate within its corresponding pipetting channel, causing the multiple pipetting channels to generate negative pressure for liquid aspiration or to expel air from the multiple pipetting channels.

[0004] In at least one embodiment of this application, the transmission assembly includes a timing belt and a plurality of timing pulleys, the timing belt being wound around each of the timing pulleys respectively, the connection assembly including a lead screw, and at least one of the timing pulleys being connected to the lead screw; the drive assembly is used to drive the plurality of timing pulleys to rotate, the plurality of timing pulleys being used to drive the lead screw to rotate, thereby driving the plunger module to translate relative to the channel module along the extension direction of one of the lead screws, the extension direction of the lead screw being parallel to the rotation axis of the timing pulleys.

[0005] In at least one embodiment of this application, the drive assembly includes a motor, the plurality of synchronous pulleys include a motor synchronous pulley and at least one transmission synchronous pulley, the motor synchronous pulley is rotatably connected to the motor, the synchronous belt is respectively wound around the motor synchronous pulley and the at least one transmission synchronous pulley, and the connection assembly includes at least one lead screw that is connected to the at least one transmission synchronous pulley in a one-to-one correspondence.

[0006] In at least one embodiment of this application, the connecting component further includes a movable block sleeved on the lead screw, the movable block being fixedly connected to the plunger module, and when the lead screw rotates, the movable block translating along the lead screw to drive the plunger module to translate synchronously.

[0007] In at least one embodiment of this application, the transmission assembly further includes an idler pulley, and the timing belt is further wound around the idler pulley, the idler pulley being used to pre-tighten the timing belt.

[0008] In at least one embodiment of this application, the idler pulley is movable to adjust the tension of the timing belt.

[0009] In at least one embodiment of this application, the idler wheel can be translated along a straight line, the straight line being perpendicular to the direction of translation of the plunger module.

[0010] In at least one embodiment of this application, the pipette pump further includes a top plate, the plunger module is located between the top plate and the channel module, the drive assembly and the transmission assembly are respectively connected to the surface of the top plate away from the plunger module, one end of the lead screw passes through the top plate and is connected to the synchronous pulley, and the other end is connected to the channel module.

[0011] In at least one embodiment of this application, the pipette pump further includes a photoelectric switch and a sensing element, one of which is fixedly connected to the plunger module and the other is fixedly connected to the channel module; an air gap exists between the transmitting end and the receiving end of the photoelectric switch, and the air gap is located on the moving path of the sensing element.

[0012] In at least one embodiment of this application, the channel module forms 96 parallel pipetting channels spaced apart from each other, and the 96 pipetting channels are arranged in a rectangular array comprising multiple rows and columns.

[0013] The aforementioned pipette pump, on the one hand, by setting multiple pipetting channels, facilitates matching with porous reaction plates and improves pipetting efficiency; on the other hand, by setting up a drive assembly, a transmission assembly, and a connecting assembly, the transmission assembly and the connecting assembly, driven by the drive assembly, convert rotational motion into linear motion, enabling the drive plunger module to translate vertically for liquid aspiration or dispensing. The aforementioned drive assembly, transmission assembly, and connecting assembly 33 have a compact structure, which is beneficial for the overall miniaturization of the pipette pump. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural view of the pipette pump in the suction state according to an embodiment of this application.

[0015] Figure 2 This is a three-dimensional structural diagram of the pipette pump in the suction state according to an embodiment of this application, viewed from another perspective.

[0016] Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure of the transfer pump along line III-III.

[0017] Figure 4This is a three-dimensional structural view of the pipette pump in the dispensing state according to an embodiment of this application.

[0018] Figure 5 This is a three-dimensional structural diagram of the pipette pump in the dispensing state according to another perspective of an embodiment of this application.

[0019] Figure 6 for Figure 5 A schematic diagram of the cross-sectional structure of the transfer pump along line VI-VI.

[0020] Explanation of main component symbols

[0021] Pipetting pump: 1; Second mounting plate: 311; Channel module: 10; Mounting opening: 3111; Main body: 11; Motor: 312; First surface: 111; Transmission assembly: 32; Second surface: 112; Motor synchronous pulley: 321; Mounting hole: 1121; Transmission synchronous pulley: 322; Pipetting channel: 114; Second idler wheel: 324; First mounting groove: 115; Synchronous belt: 325; Adapter head: 12; Slider: 326; Connecting channel: 121; Connecting assembly: 33; First sealing ring: 13; Wire Rod: 331; Second sealing ring: 14; Moving block: 332; First pressure plate: 15; Top plate: 34; Through hole: 151; Slide groove: 341; Plunger module: 20; Rail: 342; First mounting plate: 21; Support column: 35; Second mounting groove: 211; Position sensing module: 36; Plunger: 22; Photoelectric switch: 361; Second pressure plate: 23; Transmitter: 3611; O-ring: 24; Receiver: 3612; Drive module: 30; Sensing plate: 362; Drive assembly: 31; Vertical direction: Z.

[0022] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0023] Please refer to the following: Figure 1 and Figure 2 The pipette pump 1 of this application embodiment includes a channel module 10, a plunger module 20, and a drive module 30. The plunger module 20 is movably connected to the channel module 10. The drive module 30 is connected to both the channel module 10 and the plunger module 20, and is used to drive the plunger module 20 up and down relative to the channel module 10 in the vertical direction Z (within a certain range). Figure 1 (Based on orientation) Translation. When the drive module 30 drives the plunger module 20 to translate upward relative to the channel module 10, it draws liquid into the channel module 10. When the drive module 30 drives the plunger module 20 to translate downward relative to the channel module 10, it discharges the liquid from the channel module 10. By repeating the above upward and downward translation process, the pipetting pump 1 can move liquid reagents between different containers, that is, achieve "pipette".

[0024] The channel module 10 includes a main body 11 and a plurality of adapter heads 12. The main body 11 has a first surface 111 and a second surface 112 that are opposite to and spaced apart from each other. Each adapter head 12 is fixedly connected to the first surface 111 and is spaced apart from each other. The plunger module 20 and the drive module 30 are respectively connected to the second surface 112.

[0025] Please see Figure 3 The main body 11 has multiple pipetting channels 114 extending through the first surface 111 and the second surface 112. Each pipetting channel 114 is a cylindrical channel extending in the vertical direction Z. The pipetting channels 114 are spaced apart and arranged in parallel. Each adapter 12 has a cylindrical connecting channel 121 extending in the vertical direction Z. The number of pipetting channels 114 and adapters 12 are the same and correspond one-to-one. The connecting channel 121 of each adapter 12 is connected to its corresponding pipetting channel 114. The end of each adapter 12 away from the main body 11 is used to connect to an external pipette tip. That is, during the use of the pipetting pump 1, the end of each adapter 12 away from the main body 11 is connected to a pipette tip, and the pipetting channels 114, connecting channels 121 and pipette tips are connected. When the pipette tip is inserted into the target container, a negative pressure is generated in the pipetting channels 114 and connecting channels 121, and the pipette tip can draw in liquid. During the drainage process, the liquid in the pipette tip can be discharged by squeezing the air in the pipetting channel 114 and the connecting channel 121.

[0026] The channel module 10 also includes multiple first sealing rings 13. Multiple first mounting grooves 115 are formed on the first surface 111 of the main body 11. The number of first sealing rings 13 and first mounting grooves 115 are the same as the number of adapter heads 12 and correspond one-to-one. Each adapter head 12 is embedded in a corresponding first mounting groove 115, and each first sealing ring 13 is located in a corresponding first mounting groove 115 and sleeved around the corresponding adapter head 12.

[0027] The channel module 10 also includes a plurality of second sealing rings 14. The number of second sealing rings 14 is the same as that of the plunger and the pipetting channel 114, and they correspond one-to-one. Each second sealing ring 14 is located in its corresponding pipetting channel 114 and at the opening formed on the second surface 112 of the pipetting channel 114, and is also sleeved on the periphery of its corresponding plunger 22.

[0028] The plunger module 20 also includes a first pressure plate 15. The first pressure plate 15 is fixedly connected to and in direct contact with the second surface 112 of the main body 11. A through hole 151 is formed on the first pressure plate 15 corresponding to the position of each pipetting channel 114. The number of through holes 151 is the same as the number of pipetting channels 114 and the number of plungers 22, and they correspond one-to-one. The lower end of each plunger 22 passes through the corresponding through hole 151 and extends into the corresponding pipetting channel 114.

[0029] The plunger module 20 includes a first mounting plate 21 and a plurality of plungers 22. The first mounting plate 21 is generally parallel to the first surface 111 and the second surface 112, and each plunger 22 is embedded in the first mounting plate 21. Each plunger 22 is a cylindrical structure extending in the vertical direction Z, and the plungers 22 are arranged parallel to each other at intervals on the first mounting plate 21. The plurality of plungers 22 are the same number as the plurality of pipetting channels 114 and correspond one-to-one. Each plunger 22 is movably connected to a corresponding pipetting channel 114, and the outer surface of each plunger 22 is in close contact with the inner wall of its corresponding pipetting channel 114. During pipetting, the plungers move synchronously. When the plunger 22 moves upward in the pipetting channel 114, a negative pressure is generated in the pipetting channel 114 and the connecting channel 121, causing the disposable pipette tip installed on the adapter 12 to draw in liquid. When the plunger 22 moves downward in the pipetting channel 114, it squeezes the air in the pipetting channel 114 and the connecting channel 121 to expel liquid from the pipette tip.

[0030] The plunger module 20 also includes a second pressure plate 23, with the first mounting plate 21 and each plunger 22 located between the first pressure plate 15 and the second pressure plate 23. The second pressure plate 23 is fixedly connected to the surface of the first mounting plate 21 away from the first pressure plate 15, and is also fixedly connected to the drive module 30.

[0031] The first mounting plate 21 has multiple second mounting slots 211. The number of second mounting slots 211 is the same as the number of plungers 22, and they correspond one-to-one. Each plunger 22 is embedded in a corresponding second mounting slot 211. The plunger module 20 also includes multiple O-rings 24, the number of which is the same as the number of second mounting slots 211 and plungers 22, and they correspond one-to-one. Each O-ring 24 is located in a corresponding second mounting slot 211 and is sleeved around the periphery of a corresponding plunger 22.

[0032] In this embodiment, the pipette pump 1 includes 96 pipetting channels 114, 96 plungers 22, and 96 adapters 12, arranged in a rectangular array of 8 rows and 12 columns. Therefore, the pipette pump 1 in this embodiment has a 96-channel structure, allowing simultaneous connection of 96 pipette tips during a single working period, achieving synchronous pipetting across 96 channels. However, the pipette pump 1 can only be matched with 96-well reaction plates, resulting in relatively low pipetting efficiency.

[0033] Please refer to this document as well. Figure 1 and Figure 2The drive module 30 includes a drive assembly 31, a transmission assembly 32, and a connecting assembly 33. The transmission assembly 32 connects the drive assembly 31 and the connecting assembly 33. The connecting assembly 33 connects the channel module 10 and the plunger module 20. The drive assembly 31 drives the connecting assembly 33 to rotate via the transmission assembly 32, thereby causing the plunger module 20 to translate relative to the channel module 10, thus achieving liquid aspiration and drainage. The drive module 30 also includes a top plate 34. The plunger module 20 is located between the top plate 34 and the channel module 10. The drive assembly 31 and the transmission assembly 32 are connected to the surface of the top plate 34 away from the plunger module 20, and the connecting assembly 33 is connected to the surface of the top plate 34 facing the plunger module 20.

[0034] The drive assembly 31 includes a second mounting plate 311 and a motor 312. The second mounting plate 311 is parallel to the top plate 34 and is fixedly connected to the surface of the top plate 34 by screws. The motor 312 is fixedly connected to the bottom surface of the second mounting plate 311 by screws. The second mounting plate 311 is fixedly connected to the edge of the top plate 34, so that the second mounting plate 311 protrudes relative to the edge of the top plate 34, thereby allowing the motor 312 on the second mounting plate 311 to be suspended and not occupying the mounting space of the top plate 34.

[0035] The transmission assembly 32 includes a motor synchronous pulley 321, three transmission synchronous pulleys 322, a first idler pulley 323, a second idler pulley 324, and a synchronous belt 325.

[0036] The second mounting plate 311 has a circular mounting opening 3111 extending through it. A motor synchronizing pulley 321 is located within the mounting opening 3111 and is connected to a motor 312 via a central shaft. The motor 312 drives the motor synchronizing pulley 321 to rotate around its axis, which is parallel to the vertical direction Z.

[0037] Three drive synchronous pulleys 322, a first idler pulley 323, and a second idler pulley 324 are spaced apart on the surface of the top plate 34 away from the plunger module 20. A synchronous belt 325 is sequentially wound around the motor synchronous pulley 321, the first drive synchronous pulley 322, the first idler pulley 323, the two drive synchronous pulleys 322, the second idler pulley 324, and the motor synchronous pulley 321. The first idler pulley 323 and the second idler pulley 324 have smooth surfaces for pre-tensioning the synchronous belt 325. The surfaces of the motor synchronous pulley 321 and the three drive synchronous pulleys 322 are respectively formed with a serrated structure.

[0038] After the first idler pulley 323 and the second idler pulley 324 pre-tighten the synchronous belt 325, when the motor synchronous pulley 321 rotates, the friction between the synchronous belt 325 and the sawtooth structure drives the three transmission synchronous pulleys 322 and the motor synchronous pulley 321 to rotate synchronously around a parallel shaft.

[0039] The top plate 34 has a strip-shaped groove 341 on its surface where the first idler wheel 323 is located, and a track 342 with a raised bottom relative to the groove 341 is formed. The track 342 extends in a straight line parallel to the top plate 34. The transmission assembly 32 also includes a slider 326. The first idler wheel 323 is fixedly connected to the slider 326, and the slider 326 is slidably connected to the track 342, so as to drive the first idler wheel 323 to move synchronously in the groove 341 along the extension direction of the track 342. By moving the first idler wheel 323, the pretension of the synchronous belt 325 can be adjusted. In other embodiments of this application, the tension of the synchronous belt 325 can also be adjusted by other movement methods, such as moving along a curved direction or moving in multiple directions, as long as the first idler wheel 323 is movably connected to the top plate 34.

[0040] The second idler pulley 324 is fixedly connected to the top plate 34. The second idler pulley 324 allows the synchronous belt 325 to contact the toothed structures on the motor synchronous pulley 321 and the transmission synchronous pulley 322 closest to the motor synchronous pulley 321, increasing friction so that when the motor synchronous pulley 321 rotates, the synchronous belt 325 has sufficient friction to drive the transmission synchronous pulley 322 to rotate synchronously. In at least one embodiment of this application, the winding angle of the synchronous belt 325 on the motor synchronous pulley 321 and each of the transmission synchronous pulleys 322 is greater than 60°.

[0041] In this embodiment, the top plate 34 is a rectangular plate structure. Three synchronous transmission pulleys 322 are respectively connected to two opposite sides of the top plate 34 to balance the driving force. Specifically, one synchronous transmission pulley 322 is located on one short side of the top plate 34, and the other two synchronous transmission pulleys 322 are located on the other short side of the top plate 34.

[0042] In other embodiments of this application, the number of idler pulleys and transmission synchronous pulleys may be less or more, and their installation positions on the top plate 34 may also be different. The idler pulley can pre-tighten the synchronous belt 325, and the transmission synchronous pulley 322 can rotate synchronously with the motor synchronous pulley 321 to drive the plunger module 20 to translate.

[0043] The connecting assembly 33 includes a plurality of lead screws 331 and a plurality of moving blocks 332, each corresponding to the other. Each lead screw 331 extends vertically in the Z direction, and the lead screws 331 are parallel to each other and spaced apart. Each lead screw 331 passes through the edge region of the second pressure plate 23, and each moving block 332 is sleeved on its corresponding lead screw 331 and fixed to the second pressure plate 23 by screws. The second pressure plate 23 is located between the moving blocks 332 and the main body 11.

[0044] The second surface 112 of the main body 11 is also provided with a plurality of mounting holes 1121. The number of mounting holes 1121 is the same as that of the lead screws 331 and they correspond one-to-one. The lead screws 331 are also connected to the same number of transmission synchronous pulleys 322 and they correspond one-to-one. One end of each lead screw 331 passes through the top plate 34 and is connected to the central shaft of the corresponding transmission synchronous pulley 322, and the other end extends into the corresponding mounting hole 1121 and is connected to the main body 11.

[0045] When the transmission synchronous pulley 322 rotates, the synchronous pulley 322 drives the lead screw 331 connected to it to rotate synchronously. The surface of the lead screw 331 has an external thread, and the moving block 332 sleeved on the lead screw 331 has an internal thread. When the lead screw 331 rotates, the moving block 332 moves along the extension direction of the lead screw 331, that is, moves along the vertical direction Z, thereby driving the second pressure plate 23, the first mounting plate 21 and all the plungers 22 to move synchronously.

[0046] Therefore, in this embodiment, by activating the motor 312 in the drive assembly 31, the motor synchronous pulley 31 and each transmission synchronous pulley 32 in the transmission assembly 32 rotate, which drives the lead screw 331 in the connecting assembly 33 to rotate synchronously, thereby causing the moving block 332 to drive the plunger module 20 to move synchronously (that is, to convert rotational motion into linear motion). By switching the direction of rotation of the motor synchronous pulley 321 driven by the motor 312, the moving block 332 can be switched to drive the plunger module 20 to move synchronously upward or downward.

[0047] The pipette pump 1 also includes a plurality of spaced-apart and parallel support columns 35 for supporting and defining the height between the drive module 30 and the channel module 10, allowing the plunger module 20 to move vertically within the space between the drive module 30 and the channel module 10. Each support column 35 is a cylindrical structure and parallel to the lead screw 331. One end of each support column 35 is fixedly connected to the top plate 34, and the other end is fixedly connected to the second surface 112 of the main body 11.

[0048] In this embodiment, the pipette pump 1 includes three lead screws 331 and three support columns 35, and the second pressure plate 23 is a generally rectangular plate structure. Two lead screws 331 and one support column 35 are located on one short side of the second pressure plate 23, while the remaining lead screw 331 and the remaining two support columns 35 are located on the other short side of the second pressure plate 23. This helps to balance the supporting force and the driving force of the drive module 30 on the plunger module 20, so that the plungers in the plunger module 20 can always maintain synchronous translation, that is, always remain on the same horizontal plane. In other embodiments of this application, the number of support columns 35 and lead screws 331 can be different.

[0049] Please see Figure 1The pipette pump 1 also includes a position sensing module 36. The position sensing module 36 includes a photoelectric switch 361 and a sensing element 362. The photoelectric switch 361 is fixedly connected to the side of the main body 11, which is perpendicular to the second surface 112. The sensing element 362 is fixedly connected to the second pressure plate 23 at the position where the lead screw 331 is connected. The photoelectric switch 361 has an emitting end 3611 for emitting sensing light and a receiving end 3612 for receiving sensing light, with an air gap between the emitting end 3611 and the receiving end 3612. The sensing element 362 can be synchronously translated with the plunger module 20, and the air gap is located on the displacement path of the sensing element 362. When the sensing element 362 translates to the air gap, it blocks the propagation of sensing light, preventing the receiving end 3612 from sensing the sensing light. At this time, the position sensing module 36 can report that the plunger 22 has reached the pipetting channel 114 (see...). Figure 3 At the bottom of the motor 312, the motor can be stopped.

[0050] The following describes the operation of the aforementioned pipette pump 1:

[0051] Please see Figures 1-3 In the liquid aspiration state: pipette tips (not shown) are installed on each adapter head 12; the slider 326 is moved along the track 342, causing the first idler wheel 323 to move synchronously until the timing belt 325 is pre-tightened; the motor 312 is turned on, driving the motor timing wheel 321 to rotate; under the drive of the timing belt 325, the three transmission timing wheels 322 rotate synchronously; each transmission timing wheel 322 drives the lead screw 331 connected to it to rotate; as the lead screw 331 rotates, the moving block 332 on each lead screw 331 moves vertically upward along the lead screw 331; the plunger module 20 moves vertically upward along with the moving block 332, causing each plunger 22 to move vertically upward in the pipetting channel 114; when the plunger 22 moves upward, a negative pressure is generated in the pipetting channel 114 and the connecting channel 121, thereby generating suction, and the pipette tip can be drawn into the liquid reagent for storage.

[0052] Please see Figures 4-6 In the dispensing state, the motor 312 is turned on and drives the motor synchronous pulley 321 to rotate in the opposite direction to that in the aspiration state. Under the drive of the synchronous belt 325, the three transmission synchronous pulleys 322 rotate synchronously. Each transmission synchronous pulley 322 drives the lead screw 331 connected to it to rotate. As the lead screw 331 rotates, the moving block 332 on each lead screw 331 moves vertically downward along the lead screw 331. The plunger module 20 moves vertically downward along with the moving block 332, so that each plunger 22 moves vertically downward in the pipetting channel 114. When the plunger 22 moves downward, it squeezes the gas in the pipetting channel 114 and the connecting channel 121, thereby squeezing the liquid reagent in the pipette tip to expel the liquid reagent in the pipette tip.

[0053] The pipette pump 1 of this embodiment, on the one hand, by providing multiple (96 in this embodiment) pipetting channels 114, facilitates matching with porous reaction plates and improves pipetting efficiency; on the other hand, by providing a drive assembly 31, a transmission assembly 32, and a connecting assembly 33, the transmission assembly 32 and the connecting assembly 33, driven by the drive assembly 31, convert rotational motion into linear motion, enabling the drive plunger module 20 to translate vertically for liquid aspiration or dispensing. The aforementioned drive assembly 31, transmission assembly 32, and connecting assembly 33 have a compact structure, which is beneficial for the overall miniaturization of the pipette pump 1.

[0054] Those skilled in the art should recognize that the above embodiments are only used to illustrate this application and are not intended to limit this application. As long as they are within the essential spirit and scope of this application, appropriate changes and variations made to the above embodiments fall within the scope of protection claimed in this application.

Claims

1. A pipetting pump, characterized in that include: The channel module forms multiple independent pipetting channels; A plunger module includes multiple plungers, each of which corresponds to a single pipetting channel, and each plunger is movably connected to its corresponding pipetting channel. The drive module includes a drive component, a transmission component, and a connecting component. The transmission component is connected to the drive component and the connecting component, and the connecting component is connected to the channel module and the plunger module. The transmission component and the connecting component are used to convert rotational motion into linear motion under the drive of the drive component, so as to drive each plunger to translate in a corresponding pipetting channel, so as to generate negative pressure to draw liquid in the multiple pipetting channels, or to squeeze out air in the multiple pipetting channels. as well as A photoelectric switch and a sensing element are provided, one of which is fixedly connected to the plunger module and the other is fixedly connected to the channel module; an air gap exists between the transmitting end and the receiving end of the photoelectric switch, and the air gap is located on the moving path of the sensing element.

2. The pipette pump of claim 1, wherein, The transmission assembly includes a timing belt and a plurality of timing pulleys, the timing belt being wound around each of the timing pulleys respectively, and the connection assembly includes a lead screw, with at least one of the timing pulleys connected to the lead screw; The drive assembly is used to drive the plurality of synchronous pulleys to rotate, and the plurality of synchronous pulleys are used to drive the lead screw to rotate, so as to drive the plunger module to translate relative to the channel module along the extension direction of the lead screw, and the extension direction of the lead screw is parallel to the rotation axis of the synchronous pulley.

3. The pipette pump of claim 2, wherein, The drive assembly includes a motor, the plurality of synchronous pulleys include a motor synchronous pulley and at least one transmission synchronous pulley, the motor synchronous pulley is rotatably connected to the motor, the synchronous belt is respectively wound around the motor synchronous pulley and the at least one transmission synchronous pulley, and the connection assembly includes at least one lead screw that is connected to the at least one transmission synchronous pulley in a one-to-one correspondence.

4. The pipette pump of claim 2, wherein, The connecting assembly also includes a movable block sleeved on the lead screw. The movable block is fixedly connected to the plunger module. When the lead screw rotates, the movable block moves along the lead screw to drive the plunger module to move synchronously.

5. The pipette pump of claim 2, wherein, The transmission assembly also includes an idler pulley, and the timing belt is wound around the idler pulley, which is used to pre-tighten the timing belt.

6. The pipette pump of claim 5, wherein, The idler pulley is movable to adjust the tension of the timing belt.

7. The pipette pump of claim 6, wherein, The idler wheel can translate along a straight line, and the straight line is perpendicular to the direction of translation of the plunger module.

8. The pipette pump of claim 2, wherein, The pipette pump also includes a top plate, the plunger module is located between the top plate and the channel module, the drive assembly and the transmission assembly are respectively connected to the surface of the top plate away from the plunger module, one end of the lead screw passes through the top plate and is connected to the synchronous pulley, and the other end is connected to the channel module.

9. The pipette pump according to any one of claims 1 to 8, characterized in that The channel module has 96 parallel pipetting channels spaced apart from each other, and the 96 pipetting channels are arranged in a rectangular array consisting of multiple rows and columns.

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