CN217910505U

CN217910505U - Pipetting device

Info

Publication number: CN217910505U
Application number: CN202222228428.4U
Authority: CN
Inventors: 范普; 胡兰
Original assignee: Guangzhou Chengqi Biotechnology Co ltd
Current assignee: Guangzhou Chengqi Biotechnology Co ltd
Priority date: 2022-08-23
Filing date: 2022-08-23
Publication date: 2022-11-29
Anticipated expiration: 2032-08-23

Abstract

The utility model discloses a liquid transfer device, which comprises a liquid transfer box, wherein a mounting groove is formed on the liquid transfer box, a mounting plate is arranged in the mounting groove, at least two accommodating grooves are formed on the top surface of the mounting plate, an adjusting mechanism is arranged below the mounting plate, the adjusting mechanism comprises a sliding block, and the top end of the sliding block is connected with the bottom end of the mounting plate; the liquid transfer box is provided with a liquid transfer box, the liquid transfer box is provided with a driving and moving mechanism, a lifting mechanism is arranged in the liquid transfer box, the driving and moving mechanism is connected with the lifting mechanism, the bottom end of the lifting mechanism is provided with a liquid transfer gun, and the bottom end of the liquid transfer gun faces the mounting plate; on any lateral wall of pipetting box, or pipetting box is equipped with the peristaltic pump outward, is equipped with the branch liquid pipe on the peristaltic pump, divides liquid pipe one end towards the mounting panel, in the other end stretched into liquid container, the utility model provides an adopt hand-held type pipettor can't realize continuous many times equivalent discharge liquid problem, the operating personnel who avoids long-time operation to lead to then causes the wrong liquid of interpolation or leaks the liquid, and the condition of heavy then muscle soreness strain takes place.

Description

Pipetting device

Technical Field

The utility model belongs to the technical field of the sample test equipment, concretely relates to move liquid device.

Background

At the present stage, in the laboratories of each field such as medical science detection, environmental monitoring, food and drug detection, scientific research institute, college and universities and petrochemical, all can adopt pipettor (pipetting gun) as the instrument of quantitative transfer liquid, present pipettor most all is hand-held type structure, need the user to hold the pipettor and carry out the pipetting operation when using, and the distance of controlling the piston motion through the spring structure on the hand-held type pipettor, and then control the volume of absorbing of pipettor liquid, the user need press the button at pipettor top when using and absorb the liquid after unclamping the button, move in other easy again and press the button and discharge the liquid in the pipettor.

When the handheld pipettor is used, on one hand, an operator needs to press a button for a long time, so that the operator is easy to fatigue in operation, the situation of adding wrong liquid or adding missed liquid is caused, and the situation of muscle soreness and strain of the operator is caused when the liquid is seriously added; on the other hand, the operations of sucking and discharging liquid need to be repeated once for each pipetting, and the discharged dosage is judged according to the visual inspection and experience of operators, so that the effect of continuously discharging the liquid with the same dosage for multiple times cannot be realized.

Disclosure of Invention

An object of the utility model is to provide a liquid-transfering device, this liquid-transfering device can realize that the automation of liquid is drawn and the continuous many times of automatic dosage discharge, replace driven hand-held type pipettor, solved and adopted hand-held type pipettor need rely on artifical back range estimation and operation experience, can't realize continuous many times equivalent discharge liquid problem, the operating personnel who has avoided long-time operation to lead to simultaneously is then caused to add wrong liquid or leak the liquid feeding body because of the operation is tired light, then the condition that causes the sour strain of operating personnel muscle takes place seriously.

The technical scheme for achieving the purpose comprises the following steps.

The liquid transfer device provided by the utility model comprises a liquid transfer box, wherein a mounting groove is formed on the liquid transfer box, a mounting plate is arranged in the mounting groove, at least two accommodating grooves are formed on the top surface of the mounting plate, a container frame or a recycling bin is arranged in the accommodating grooves, an adjusting mechanism is arranged below the mounting plate, the adjusting mechanism comprises a movable sliding block, and the top end of the sliding block is connected with the bottom end of the mounting plate;

the liquid transfer box is provided with a liquid transfer box, the liquid transfer box is provided with a driving and moving mechanism, a lifting mechanism is arranged in the liquid transfer box, at most part of the driving and moving mechanism extends into the liquid transfer box and is connected with the lifting mechanism, the bottom end of the lifting mechanism is provided with a liquid transfer gun, and the bottom end of the liquid transfer gun faces the mounting plate;

on any side wall of the liquid transfer box, or be equipped with the peristaltic pump outside the liquid transfer box be equipped with the liquid distribution pipe on the peristaltic pump, liquid distribution pipe one end is passed move liquid box orientation in the mounting panel, the other end stretches into in the liquid container, the liquid container is located outside the liquid transfer box or locate on the liquid transfer box.

In some embodiments, the driving mechanism comprises a driving motor, a driving member is connected to a driving shaft of the driving motor in a driving manner, a first sliding block is arranged on the driving member, a connecting block is arranged on the first sliding block, the connecting block extends into the liquid transfer box at least partially, and the connecting block is connected with the lifting mechanism.

In some of these embodiments, elevating system includes the connecting plate, the connecting plate towards drive and move the mechanism on one side and have set firmly elevator motor drive the connecting plate drive the one side that moves the mechanism and be equipped with the guide rail on the side that the connecting plate deviates from drive, be equipped with the second slider on the guide rail, be equipped with the mounting bracket on the second slider, the spiro union has first screw rod on the mounting bracket, the top of first screw rod with elevator motor drive is connected.

In some embodiments, a first driving gear is sleeved on a motor shaft of the lifting motor, a first driven gear is sleeved at the top end of the first screw rod, the first driving gear and the first driven gear are in transmission connection through a first connecting belt, a fixed block is fixedly arranged on the connecting plate, and the top end of the first screw rod penetrates through the fixed block and extends to the position above the fixed block.

In some of these embodiments, be formed with the adjustment groove on the mounting bracket the bottom of mounting bracket is equipped with the pipette, the top of pipette is equipped with the adjusting lever, the top of adjusting lever is passed the mounting bracket stretches into in the adjustment groove the top of adjusting lever is equipped with the elevator on the elevator, be equipped with the second screw rod, the bottom of second screw rod with the mounting bracket spiro union, the top is passed elevator and mounting bracket extend to outside the mounting bracket, be equipped with on the mounting bracket with the adjustment motor that the second screw rod transmission is connected.

In some embodiments, a guide rod is arranged in the adjusting groove, a shaft sleeve is arranged on the lifting block, the guide rod penetrates through the lifting block and the shaft sleeve, one end of the guide rod is fixed on the top groove wall of the adjusting groove, and the other end of the guide rod is fixed on the bottom groove wall of the adjusting groove; the driving shaft of the adjusting motor is sleeved with a second driving gear, the top end of the second screw is sleeved with a second driven gear, and the second driving gear and the second driven gear are in transmission connection through a second connecting belt.

In some embodiments, an adjusting motor is arranged in the mounting groove, an adjusting rod is connected to a driving shaft of the adjusting motor in a transmission manner, a first transmission gear is sleeved on the adjusting rod, a rotating rod is arranged on one side, opposite to the adjusting rod, in the mounting groove, a second transmission gear is sleeved on the rotating rod, the first transmission gear and the second transmission gear are connected through a transmission belt, and the sliding block is arranged on the transmission belt.

In some embodiments, two opposite groove walls in the installation groove are provided with installation blocks, two opposite grooves are formed in the installation blocks, two opposite guide rods are erected between the two installation blocks, two ends of each guide rod are accommodated in the grooves, guide blocks are sleeved on the guide rods, and the guide blocks are connected with the bottom ends of the installation plates.

In some embodiments, a sealing plate is arranged in the mounting groove and at a position on the side of the adjusting mechanism, a rotating rod is arranged on the sealing plate, a rotating motor is arranged in the mounting groove, a driving shaft of the rotating motor is in transmission connection with the rotating rod, two ends of the rotating rod are provided with accommodating blocks, and the accommodating blocks are provided with fixing grooves and placing grooves.

In some embodiments, an annular groove is formed in the sealing plate, a mounting protrusion is formed in the annular groove, the mounting protrusion is provided with the rotating rod, and a guide protrusion is arranged at the bottom of the accommodating block and extends into the annular groove.

The liquid transfer device provided by the utility model, on one hand, through forming the mounting groove on the liquid transfer box, pinch the adjusting mechanism in the mounting groove, set up the mounting panel on the sliding block of the adjusting mechanism, be formed with at least two storage tanks on the mounting panel, drive the mounting panel to move about in the scope of the mounting groove through the sliding block of the adjusting mechanism when using, and then adjust the container frame activity on the mounting panel; the liquid transferring box is arranged on the liquid transferring box, the driving and transferring mechanism on the liquid transferring box extends into the liquid transferring box and is connected with the lifting mechanism in the liquid transferring box, the bottom end of the lifting mechanism is provided with the liquid transferring gun facing to the mounting groove,

when the automatic liquid transferring device is used, the driving and transferring mechanism drives the liquid transferring box to move on the liquid transferring box, the lifting mechanism drives the liquid transferring gun to lift in the direction of the liquid transferring box, so that liquid is sucked or discharged in a container on the container rack on the mounting plate, the automatic liquid sucking and discharging effect is realized by matching with the adjusting mechanism, and the automatic liquid transferring device replaces a driven handheld liquid transferring device, so that the situations that wrong liquid is added or liquid is leaked due to light operation fatigue of an operator caused by long-time operation, and muscle soreness and strain of the operator are caused by serious operation are avoided;

on the other hand, through on arbitrary lateral wall at the liquid-transfering box, or be equipped with the peristaltic pump outside the liquid-transfering box, be equipped with branch liquid pipe on the peristaltic pump, branch liquid pipe one end is passed and is moved liquid box towards the mounting panel, in the other end stretches into liquid container, liquid container locates outside the liquid-transfering box or locate and move on the liquid-transfering box, when using, in liquid in with liquid container carries the container on the container frame on the mounting panel through dividing the liquid pipe through the peristaltic pump function, utilizes the repeatability of peristaltic pump, the high characteristic of stability precision, realizes the purpose of isodose discharged liquid to the solution is held formula pipettor and need rely on artifical back range estimation and operation experience, can't realize continuous many times equivalent discharged liquid problem.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic structural view of the present invention with a part of the structure removed;

fig. 3 is a partial enlarged view of a portion a of fig. 2 of the present invention;

fig. 4 is a schematic view of the driving and moving mechanism of the present invention;

fig. 5 is a schematic view of an adjustment mechanism of the present invention.

Description of reference numerals:

10. a liquid transfer box; 11. mounting grooves; 12. mounting a plate; 121. a containing groove; 122. a blocking lever; 13. a sealing plate; 131. mounting a bump; 132. an annular groove; 14. a liquid transfer box; 15. a recycling bin; 16. a pipetting container;

20. a driving and moving mechanism; 21. a driving and moving motor; 22. a transmission member; 23. a first slider; 24. connecting blocks;

30. a lifting mechanism; 31. a lifting motor; 311. a first drive gear; 32. a connecting plate; 33. a guide rail; 34. a second slider; 35. a mounting frame; 36. a first screw; 37. a fixed block; 38. a first driven gear; 39. a first connecting belt;

41. an adjustment groove; 42. an adjusting lever; 43. a lifting block; 431. a shaft sleeve; 44. a second screw; 45. adjusting the motor; 46. a second driving gear; 47. a second driven gear; 48. a second connecting strap; 49. a guide bar;

51. mounting blocks; 52. a groove; 60. an adjustment mechanism; 61. adjusting the motor; 62. adjusting a rod; 63. a first drive gear; 64. a second transmission gear; 65. a transmission belt; 66. a slider; 67. a guide bar; 68. a guide block;

71. rotating the rod; 72. accommodating the block; 80. a peristaltic pump; 81. a liquid separating pipe; 82. a liquid container; 90. a liquid transferring gun; 91. disposable pipette tips.

Detailed Description

To facilitate understanding of the present invention, specific embodiments thereof will be described in more detail below with reference to the accompanying drawings.

As used herein, unless otherwise specified or defined, "first, second …" is used merely to distinguish between names and does not denote a particular quantity or order.

As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items, unless otherwise specified or defined.

It should be noted that "fixed to" or "connected to" in this document may be directly fixed to or connected to one element or may be indirectly fixed to or connected to one element.

As shown in fig. 1 to 5, the liquid transfer device provided in this embodiment includes a liquid transfer case 10, a mounting groove 11 is formed on the liquid transfer case 10, an adjusting mechanism 60 is disposed in the mounting groove 11, a mounting plate 12 is disposed on the adjusting mechanism 60, a liquid transfer box 14 is disposed on the liquid transfer case 10, a driving mechanism 20 is disposed on the liquid transfer case 10, a lifting mechanism 30 is disposed in the liquid transfer box 14, at most a part of the driving mechanism 20 extends into the liquid transfer box 14 and is connected to the lifting mechanism 30, a liquid transfer gun 90 is disposed at a bottom end of the lifting mechanism 30, a bottom end of the liquid transfer gun 90 faces the mounting plate 12, and a disposable liquid transfer tip 91 for sucking or discharging liquid is disposed on the liquid transfer gun 90.

A peristaltic pump 80 is arranged on any side wall of the pipetting box 10 or outside the pipetting box 10, a liquid dividing pipe 81 is arranged on the peristaltic pump 80, one end of the liquid dividing pipe 81 penetrates through the pipetting box 14 and faces the mounting plate 12, the other end of the liquid dividing pipe extends into a liquid container 82, and the liquid container 82 is arranged outside the pipetting box 10 or on the pipetting box 10.

It can be understood that when the liquid distribution tube 81 passes through the liquid transferring box 14 and faces the mounting plate 12, a fixing structure for fixing the liquid distribution tube 81 is provided in the liquid transferring box 14, and the fixing structure may be a snap fastener, a fixing ring, or an engagement groove, so long as the fixing of the liquid distribution tube 81 in the liquid transferring box 14 can be achieved.

Adjustment mechanism 60 is including locating adjustment motor 61 in the mounting groove 11 mode transmission such as shaft coupling or gear structure is connected with adjusts pole 62 in the drive shaft of adjustment motor 61 the cover is equipped with first drive gear 63 on adjusting pole 62 be located in the mounting groove 11 with the one end that adjusts pole 62 and is relative is equipped with the dwang the cover is equipped with second drive gear 64 on the dwang, first drive gear 63 and second drive gear 64 realize the transmission through drive belt 65 and connect locate sliding block 66 on the drive belt 65 be equipped with mounting panel 12 on the sliding block 66, work as during adjustment motor 61 functions, drive adjust pole 62 and rotate, order about first drive gear 63 and rotate and drive belt 65 and rotate to drive mounting panel 12 on the sliding block 66 on the drive belt 65 at the 11 internal displacement of mounting groove.

A plurality of blocking rods 122 are arranged on the top surface of the mounting plate 12, a plurality of accommodating grooves 121 are formed around the plurality of blocking rods 122, a container rack or a recovery barrel 15 is arranged in the accommodating grooves 121, the container rack is used for accommodating containers required for pipetting and containers required for storing disposable pipetting tips 91, and the recovery barrel 15 is used for recovering the disposable pipetting tips 91 used on the pipetting gun 90.

Lie in the mounting groove 11 the both sides of drive belt 65 are equipped with two relative guide arms 67 that set up the cover is equipped with mobilizable guide block 68 on the guide arm 67, guide block 68 with the bottom of mounting panel 12 is connected, when using, utilizes the limiting displacement that guide block 68 can only move about on guide arm 67, thereby the restriction the displacement direction of mounting panel 12 in mounting groove 11 does the direction of guide block 68 activity on guide arm 67 can improve the stability and the smoothness nature of mounting panel 12 displacement simultaneously.

The mounting blocks 51 are arranged on two opposite groove walls in the mounting groove 11, two opposite grooves 52 are formed on each mounting block 51, the guide rod 67 is arranged between the two mounting blocks 51, and the end part of the guide rod 67 is rotatably accommodated in the groove 52.

The driving and moving mechanism 20 comprises a driving and moving motor 21, a transmission member 22 is connected to a driving shaft of the driving and moving motor 21 in a transmission manner, a first sliding block 23 is arranged on the transmission member 22, a connecting block 24 is arranged on the first sliding block 23, at least part of the connecting block 24 extends into the liquid transferring box 14, and the connecting block 24 is connected with the lifting mechanism 30.

Elevating system 30 includes connecting plate 32 orientation driving and moving mechanism 20 one side on has set firmly elevator motor 31 connecting plate 32 deviates from driving and moving mechanism 20 one side on be equipped with guide rail 33 be equipped with second slider 34 on guide rail 33, be equipped with mounting bracket 35 on second slider 34 the spiro union has first screw rod 36 on mounting bracket 35, the top of first screw rod 36 with elevator motor 31 transmission is connected.

The motor shaft of the lifting motor 31 is sleeved with a first driving gear 311, the top end of the first screw rod 36 is sleeved with a first driven gear 38, the first driving gear 311 and the first driven gear 38 are in transmission connection through a first connecting belt 39, the connecting plate 32 is fixedly provided with a fixing block 37, and the top end of the first screw rod 36 penetrates through the fixing block 37 and extends to the position above the fixing block 37.

When in use, on one hand, the driving motor 21 operates to drive the transmission member 22 to rotate, so that the first sliding block 23 on the transmission member 22 slides on the transmission member 22, and the connecting block 24 is driven to push the pipetting box 14 to reciprocate on the pipetting box 10; on one hand, the lifting motor 31 drives the first screw rod 36 to rotate, so that the mounting frame 35 is driven to drive the second sliding block 34 to reciprocate on the guide rail 33; on one hand, the adjusting motor 61 is operated to drive the adjusting rod 62 to rotate, and then the driving belt 65 is driven to rotate, so as to drive the mounting plate 12 on the sliding block 66 to reciprocate in the mounting groove 11.

Setting the moving direction of the first slider 23 on the transmission member 22 as the X-axis direction, setting the moving direction of the slider 66 on the belt 65 as the Y-axis direction, and setting the moving direction of the second slider 34 on the guide rail 33 as the Z-axis direction; so that the pipetting device can achieve the effect of three-axis operation.

Be formed with adjustment tank 41 on the mounting bracket 35 the bottom of mounting bracket 35 is equipped with liquid-transfering gun 90, liquid-transfering gun 90's top is equipped with adjusting rod 42, the top of adjusting rod 42 is passed mounting bracket 35 stretches into in the adjustment tank 41 the top of adjusting rod 42 is equipped with elevator 43 be equipped with second screw rod 44 on the elevator 43, the bottom of second screw rod 44 with the mounting bracket 35 spiro union, the top is passed elevator 43 and mounting bracket 35 extend to outside the mounting bracket 35 be equipped with on the mounting bracket 35 with the adjustment motor 45 that the transmission of second screw rod 44 is connected.

A guide rod 49 is arranged in the adjusting groove 41, a shaft sleeve 431 is arranged on the lifting block 43, the guide rod 49 penetrates through the lifting block 43 and the shaft sleeve 431, one end of the guide rod 49 is fixed on the top groove wall of the adjusting groove 41, and the other end of the guide rod 49 is fixed on the bottom groove wall of the adjusting groove 41; a second driving gear 46 is sleeved on the driving shaft of the adjusting motor 45, a second driven gear 47 is sleeved at the top end of the second screw 44, and the second driving gear 46 and the second driven gear 47 are in transmission connection through a second connecting belt 48.

When the device is used, the operation of the adjusting motor 45 drives the lifting block 43 to lift in the adjusting groove 41, so as to push the adjusting rod 62 to lift, drive the pipetting cavity to further lift in the Z-axis direction, and be adapted to pipetting treatment of pipetting containers 16 with different depths.

A sealing plate 13 is arranged at a position of the side portion of the adjusting mechanism 60 in the mounting groove 11, a rotating rod 71 is arranged on the sealing plate 13, a rotating motor is arranged in the mounting groove 11, a driving shaft of the rotating motor (not shown, the same below) is in transmission connection with the rotating rod 71 through a coupling or gear structure, two ends of the rotating rod 71 are provided with accommodating blocks 72, and the accommodating blocks 72 are provided with fixing grooves (not shown, the same below) and placing grooves (not shown, the same below).

An annular groove 132 is formed in the sealing plate 13, a mounting protrusion 131 is formed in the annular groove 132, the rotating rod 71 is disposed on the mounting protrusion 131, and a guiding protrusion (not shown, the same applies below) is disposed at the bottom of the accommodating block 72, and extends into the annular groove 132.

When using, hold the fixed slot of piece 72 and be used for placing and move the liquid test tube, the standing groove is used for placing the test tube lid that moves the liquid test tube, the rotating electrical machines function drive rotary rod 71 rotates, drives hold piece 72 and pass through the cooperation of guide projection and ring channel 132 is rotated along ring channel 132 for can constantly replace and need carry out the liquid test tube that moves the liquid processing, improve and move liquid efficiency.

In the pipetting device provided by the embodiment, on one hand, the mounting groove 11 is formed on the pipetting box 10, the adjusting mechanism 60 is arranged on the mounting groove 11, the mounting plate 12 is arranged on the sliding block 66 of the adjusting mechanism 60, at least two accommodating grooves 121 are formed on the mounting plate 12, and when in use, the mounting plate 12 is driven to move in the range of the mounting groove 11 by the sliding block 66 of the adjusting mechanism 60, so that the container rack on the mounting plate 12 is adjusted to move; the liquid transfer box 14 is arranged on the liquid transfer box 10, the driving and moving mechanism 20 on the liquid transfer box 10 extends into the liquid transfer box 14 and is connected with the lifting mechanism 30 in the liquid transfer box 14, the liquid transfer gun 90 facing the mounting groove 11 is arranged at the bottom end of the lifting mechanism 30, when the liquid transfer box is used, the driving and moving mechanism 20 drives the liquid transfer box 14 to move on the liquid transfer box 10, the lifting mechanism 30 drives the liquid transfer gun 90 to ascend and descend above the liquid transfer box 10, then the liquid is sucked or discharged in the container on the container rack on the mounting plate 12, the automatic liquid sucking and automatic liquid discharging effects are realized by matching with the adjusting mechanism 60, a transmission handheld liquid transfer machine is replaced, and the situations that the operator is subjected to wrong liquid adding or liquid leaking due to light operation fatigue and the muscle pain strain of the operator due to heavy operation caused by long-time operation are avoided;

on the other hand, a peristaltic pump 80 is arranged on any side wall of the pipette box 10 or outside the pipette box 10, a liquid distribution pipe 81 is arranged on the peristaltic pump 80, one end of the liquid distribution pipe 81 penetrates through the pipette box 14 and faces the mounting plate 12, the other end of the liquid distribution pipe extends into the liquid container 82, the liquid container 82 is arranged outside the pipette box 10 or on the pipette box 10, when the pipette box is used, liquid in the liquid container 82 is conveyed into a container on a container rack on the mounting plate 12 through the liquid distribution pipe 81 by the operation of the peristaltic pump 80, and the aim of discharging the liquid in equal dosage is fulfilled by utilizing the characteristics of high repetition precision and high stability precision of the peristaltic pump 80, so that the problem that the handheld pipette cannot discharge the liquid continuously for multiple times and in equal quantity due to the need of depending on manual visual inspection and operation experience is solved.

The above examples are not intended to be exhaustive list of the present invention, and there may be many other embodiments not listed. Any replacement and improvement made on the basis of not violating the conception of the utility model belong to the protection scope of the utility model.

Claims

1. The liquid transfer device is characterized by comprising a liquid transfer box, wherein a mounting groove is formed in the liquid transfer box, a mounting plate is arranged in the mounting groove, at least two accommodating grooves are formed in the top surface of the mounting plate, a container frame or a recovery barrel is arranged in each accommodating groove, an adjusting mechanism is arranged below the mounting plate and comprises a movable sliding block, and the top end of the sliding block is connected with the bottom end of the mounting plate;

2. Pipetting device according to claim 1, characterized in that the drive means comprise a drive motor, a drive element being drivingly connected to the drive shaft of the drive motor, a first slide being provided on the drive element, a connection block being provided on the first slide, the connection block extending at least partially into the pipetting box, and the connection block being connected to the lifting means.

3. The liquid transfer device according to claim 2, wherein the lifting mechanism comprises a connecting plate, a lifting motor is fixedly arranged on one side of the connecting plate facing the driving mechanism, a guide rail is arranged on one side of the connecting plate facing away from the driving mechanism, a second slide block is arranged on the guide rail, a mounting frame is arranged on the second slide block, a first screw rod is screwed on the mounting frame, and the top end of the first screw rod is in transmission connection with the lifting motor.

4. The pipette device according to claim 3, wherein a first driving gear is sleeved on a motor shaft of the lift motor, a first driven gear is sleeved on a top end of the first screw, the first driving gear and the first driven gear are in transmission connection through a first connecting belt, a fixed block is fixedly arranged on the connecting plate, and a top end of the first screw penetrates through the fixed block and extends above the fixed block.

5. The pipetting device as recited in claim 3 wherein an adjustment slot is formed in the mounting rack, the pipetting gun is disposed at the bottom end of the mounting rack, an adjustment rod is disposed at the top end of the pipetting gun, the top end of the adjustment rod extends into the adjustment slot through the mounting rack, an elevator block is disposed at the top end of the adjustment rod, a second screw is disposed on the elevator block, the bottom end of the second screw is in threaded connection with the mounting rack, the top end extends out of the mounting rack through the elevator block and the mounting rack, and an adjustment motor in drive connection with the second screw is disposed on the mounting rack.

6. The pipette device according to claim 5, wherein a guide rod is provided in the adjustment well, a boss is provided on the lift block, the guide rod passes through the lift block and the boss, one end of the guide rod is fixed to a top well wall of the adjustment well, and the other end of the guide rod is fixed to a bottom well wall of the adjustment well; the driving shaft of the adjusting motor is sleeved with a second driving gear, the top end of the second screw is sleeved with a second driven gear, and the second driving gear and the second driven gear are in transmission connection through a second connecting belt.

7. The pipette device according to any one of claims 1 to 6, wherein an adjustment motor is provided in the mounting groove, an adjustment lever is drivingly connected to a drive shaft of the adjustment motor, a first transmission gear is fitted on the adjustment lever, a rotating lever is provided in the mounting groove on a side opposite to the adjustment lever, a second transmission gear is fitted on the rotating lever, the first transmission gear and the second transmission gear are drivingly connected by a transmission belt, and the sliding block is provided on the transmission belt.

8. A pipetting device as recited in claim 7 wherein two opposed walls of the mounting well are provided with mounting blocks having two opposed recesses formed therein, two opposed guide rods are mounted between the two mounting blocks, the ends of the guide rods being received in the recesses, and guide blocks are mounted on the guide rods and connected to the bottom ends of the mounting plates.

9. The pipette device according to any one of claims 1 to 6, wherein a sealing plate is provided in the mounting groove at a position lateral to the regulating mechanism, a rotating rod is provided on the sealing plate, a rotating motor is provided in the mounting groove, a driving shaft of the rotating motor is drivingly connected to the rotating rod, receiving blocks are provided on both ends of the rotating rod, and a fixing groove and a placement groove are provided on the receiving blocks.

10. The pipette device according to claim 9, wherein an annular groove is formed in the sealing plate, a mounting projection is formed in the annular groove, the rotating rod is provided on the mounting projection, and a guide projection is provided at a bottom of the containing block, the guide projection extending into the annular groove.