CN217699236U - Liquid transfer mechanism and liquid workstation - Google Patents

Abstract

The utility model relates to a move liquid mechanism and liquid workstation, move liquid mechanism includes framework, move liquid subassembly, move liquid head, Z to drive assembly and move back rifle subassembly, move liquid head detachably and connect on moving liquid subassembly, move liquid subassembly, Z to drive assembly all set up in the framework, move liquid subassembly and Z to drive assembly transmission connection, and can slide along Z on the framework, move back rifle subassembly and be fixed in moving liquid subassembly, and can promote to move liquid head and withdraw from moving liquid subassembly; the utility model provides a move liquid mechanism will move the liquid head and install on moving the liquid subassembly, Z is to drive assembly output power, the drive moves the liquid subassembly and follows Z to sliding in the framework, move the liquid head through moving the liquid subassembly and independently accomplish the not suction-discharge liquid operation of co-altitude, treat to move the liquid head and accomplish to the suction-discharge liquid operation back of liquid such as reagent, move back rifle subassembly action, promote to move the liquid head and withdraw from moving the liquid subassembly, the automatic liquid head that moves of dismantling, the operation is changed to the liquid head that moves after using to the convenience, improve the change efficiency of moving the liquid head.

Description

Liquid transfer mechanism and liquid workstation

Technical Field

The utility model relates to a move liquid equipment technical field, especially relate to a move liquid mechanism and liquid work station.

Background

With the rapid development of science and technology, in the fields of medical treatment, physics, chemistry, biology and the like, for the purposes of sampling, proportioning and the like, a small amount of liquid needs to be taken out of a certain reagent, and the taken-out reagent is mixed with another reagent. If carry out liquid transfer work to liquid through manual operation, often appear because of operating personnel's operating error and seriously influence the credibility of sample preparation, and long-time sample preparation in-process, operating personnel's healthy also can receive the influence. Therefore, reagent or other liquid is usually transferred by the liquid handling station, and in order to improve the liquid transfer efficiency of the liquid handling station, the liquid handling station is usually provided with a plurality of liquid transfer modules for simultaneously transferring liquid, or a multi-channel liquid transfer module is used for transferring liquid.

However, no matter a plurality of pipetting modules are arranged on the liquid treatment workstation or a multi-channel pipetting module is used for completing the pipetting work of liquid, the pipetting modules or the multi-channel pipetting module can only move up and down along the Z-axis direction of the workbench simultaneously to complete the pipetting work, and each channel in each pipetting module or the pipetting module can not independently move up and down along the Z-axis direction of the workbench freely, namely, the pipetting and draining actions of liquid can not be independently performed, and the pipetting and draining work requirements of different heights, different dosages, different reagents and the like can not be met.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide a liquid transfer mechanism and a liquid workstation, which are directed to solve the problem that the conventional liquid workstation cannot independently perform liquid sucking and discharging operations.

The utility model provides a move liquid mechanism, includes the framework, move liquid subassembly, move liquid head, Z to drive assembly and move back the rifle subassembly, move liquid head detachably connect in move liquid subassembly is last, move liquid subassembly Z to drive assembly all set up in the framework, move liquid subassembly with Z is connected to the drive assembly transmission, just can follow Z in the framework and to sliding, it is fixed in to move back the rifle subassembly move on the liquid subassembly, and can promote move liquid head and withdraw from move liquid subassembly.

Above-mentioned move liquid mechanism, at first install the liquid transfer head on moving the liquid subassembly, Z is to drive assembly output power after that, the drive moves the liquid subassembly and follows Z to sliding in the framework, drive the liquid transfer head through moving the liquid subassembly and independently accomplish the suction and drainage operation of co-altitude, treat to move the liquid head and accomplish to the suction and drainage operation back of liquid such as reagent, move back rifle assembly action, promote to move the liquid head and withdraw from and move the liquid subassembly, the liquid head is moved in automatic dismantlement, the operation is changed to the liquid transfer head after conveniently using, improve the change efficiency of liquid transfer head. This move liquid mechanism when a plurality of liquid transfer heads, through corresponding a plurality of liquid transfer heads to set up on a plurality of liquid transfer subassemblies, the liquid operation of inhaling of different high positions can independently be accomplished to a plurality of liquid transfer heads, and the flexibility is high, can satisfy more different liquid scene demands of inhaling the flowing back.

In one embodiment, the pipetting assembly comprises a main body, a first driving source, a plunger cylinder and a plunger, wherein the main body is slidably arranged on the frame, the first driving source and the plunger cylinder are fixed on the main body, one end of the plunger is connected to the output end of the first driving source, the other end of the plunger is movably inserted into the plunger cylinder, and the pipetting head is detachably connected to the end part of the plunger cylinder far away from the plunger.

In one embodiment, the gun withdrawing assembly includes a second driving source fixed to the main body and a gun withdrawing sleeve connected to an output end of the second driving source and slidably sleeved on the plunger cylinder.

In one embodiment, the second driving source is a driving motor or a driving module composed of a power supply and an electromagnet pair.

In one embodiment, the Z-direction driving assembly includes a third driving source fixed to the frame, and a sliding module connected to an output end of the third driving source and capable of sliding in the Z-direction, and the sliding module is connected to the main body.

In one embodiment, the sliding module includes a first slider and a screw rod extending along the Z direction, the screw rod is connected to the output end of the third driving source, and the first slider is screwed on the screw rod and connected to the main body.

In one embodiment, the main body is provided with a plurality of second sliding blocks, the frame body is provided with a guide rail, and the second sliding blocks are slidably arranged on the guide rail.

In one embodiment, the device further comprises a plurality of sensors, and the sensors are uniformly fixed on the frame body along the Z direction and used for acquiring the position information of the pipetting assembly.

The utility model provides a liquid workstation, includes the frame and a plurality ofly move liquid mechanism as any one of above-mentioned technical scheme, it is a plurality of move liquid mechanism sets up side by side in the frame.

Above-mentioned liquid work station, at first install the liquid transfer head on moving the liquid subassembly, Z is to drive assembly output power after that, the drive moves the liquid subassembly and follows Z to sliding in the framework, drive the liquid transfer head through moving the liquid subassembly and independently accomplish the suction and drainage liquid operation of co-altitude, treat to move the liquid head and accomplish to the suction and drainage liquid operation back of liquid such as reagent, move back rifle assembly action, promote to move the liquid head and withdraw from and move the liquid subassembly, the liquid head is moved in automatic dismantlement, the operation is changed to the liquid head that moves after the convenience was used, improve the change efficiency of liquid head. A plurality of liquid-transfering mechanism set up in the frame side by side, correspond a plurality of liquid-transfering heads and set up on a plurality of liquid-transfering components, and a plurality of liquid-transfering heads can independently accomplish the suction and drainage operation of not co-altitude position, and the flexibility is high, can satisfy more different suction and drainage scene demands.

In one embodiment, the Z-direction driving assembly comprises third driving sources and sliding modules, and two adjacent third driving sources are staggered with each other in a plane perpendicular to the Z direction.

Drawings

Fig. 1 is a schematic structural view of a liquid transfer mechanism provided by the present invention;

fig. 2 is a schematic structural diagram of a liquid workstation provided by the present invention;

fig. 3 is a top view of the liquid workstation provided by the present invention.

Reference numerals are as follows:

100. a pipetting mechanism;

110. a frame body; 111. a guide rail;

120. a pipetting assembly; 121. a main body; 1211. a second slider; 122. a first drive source; 123. a plunger barrel; 124. a push rod plunger;

130. a Z-direction drive assembly; 131. a third drive source; 132. a sliding module; 1321. a first slider; 1322. a screw rod;

140. a gun withdrawing assembly; 141. a second drive source; 142. withdrawing the gun sleeve;

150. a sensor;

200. a liquid work station.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The technical solution provided by the embodiments of the present invention is described below with reference to the accompanying drawings.

As shown in fig. 1, the present invention provides a pipetting mechanism 100, the pipetting mechanism 100 includes a frame 110, a pipetting assembly 120, a pipetting head (not shown), a Z-direction driving assembly 130 and a gun returning assembly 140. Wherein, move liquid head detachably and connect on moving liquid subassembly 120, move liquid head and connect on moving liquid subassembly 120 when moving liquid head, move liquid head cooperation move liquid subassembly 120 and can accomplish the suction and drainage action to liquid such as reagent, and after moving liquid head and accomplish the suction and drainage operation, can dismantle the liquid head that moves liquid from moving liquid subassembly 120 to the liquid head that moves liquid after using is retrieved. The pipetting assembly 120 and the Z-direction driving assembly 130 are both arranged on the frame body 110, so that the pipetting assembly 120 and the Z-direction driving assembly 130 are installed and connected. The pipetting assembly 120 is drivingly connected with the Z-direction driving assembly 130, and the pipetting assembly 120 can slide on the frame 110 along the Z-direction, specifically, when there are a plurality of pipetting heads, the plurality of pipetting heads are correspondingly arranged on the plurality of pipetting assemblies 120, and the Z-direction driving assembly 130 can drive the corresponding pipetting assemblies 120 to slide along the Z-direction, so that the plurality of pipetting heads independently complete the liquid sucking and discharging operations at different height positions. Move back rifle subassembly 140 and be fixed in on moving liquid subassembly 120 through modes such as spiro union, riveting to moving back rifle subassembly 140 can promote and move the liquid head and withdraw from moving liquid subassembly 120, and after moving the liquid head and accomplish the suction and drainage operation, the automatic liquid head that moves of dismantling conveniently moves the liquid head after the use and change and retrieve the operation, improves the change efficiency of moving the liquid head. It should be noted that the Z direction in the present invention is a direction in which the pipetting head moves in a vertical direction, such as the Z direction shown in fig. 2.

Above-mentioned liquid moving mechanism 100, at first install the liquid transfer head on liquid transferring assembly 120, Z is to drive assembly 130 output power afterwards, drive liquid transferring assembly 120 is followed Z on framework 110 and is slided to the Z, it independently accomplishes the suction and drainage operation of co-altitude not to move the liquid transfer head to drive through liquid transferring assembly 120, treat that the liquid transfer head accomplishes the suction and drainage operation to liquid such as reagent after, move back rifle subassembly 140 and move, promote to move the liquid transfer head and withdraw from liquid transferring assembly 120, the liquid transfer head is dismantled in the automation, the operation is changed to the liquid transfer head after the use to the convenience, improve the change efficiency of liquid transfer head. When a plurality of liquid transfer heads are arranged on the plurality of liquid transfer assemblies 120, the liquid transfer heads can independently complete liquid suction and discharge operations at different height positions, the flexibility is high, and the liquid suction and discharge scene requirements of more differences can be met.

In order to perform the pipetting operation of the pipetting head for liquid such as reagent, in a preferred embodiment, as shown in fig. 1, the pipetting unit 120 includes a main body 121, a first drive source 122, a plunger cylinder 123, and a plunger 124. The body 121 is slidably disposed on the frame 110, so that when the Z-direction driving unit 130 operates, the Z-direction driving unit 130 can push the pipetting unit 120 to slide along the Z-direction through the body 121. The first driving source 122 and the plunger barrel 123 are both fixed on the main body 121 through screwing, welding and other manners, one end of the plunger 124 is connected to the output end of the first driving source 122, the other end of the plunger 124 is movably inserted into the plunger barrel 123, and the pipetting head is detachably connected to the end portion of the plunger barrel 123 far away from the plunger 124. When the first driving source 122 outputs power, the first driving source 122 can drive the plunger 124 to move in the plunger barrel 123, and liquid such as reagent is sucked into or discharged from the plunger barrel 123 through the pipetting head by using the air pressure difference between the inside and the outside of the plunger barrel 123, so as to complete the liquid sucking and discharging operation of the pipetting head on the liquid such as reagent, and the liquid dose sucked into or discharged from the pipetting head can be determined according to the occupied volume difference before and after the plunger 124 moves in the plunger barrel 123.

The plunger cylinder 123 is provided with a sealing member at an end portion close to the plunger 124 so as to ensure that the plunger cylinder 123 is always in a sealed state during the movement of the plunger 124 in the plunger cylinder 123, thereby preventing leakage of gas in the plunger cylinder 123, and enabling the liquid such as a reagent to be sucked into or discharged from the plunger cylinder 123 through the pipette head by utilizing a difference in gas pressure between the inside and the outside of the plunger cylinder 123 during the movement of the plunger 124. Moreover, when there are multiple pipetting heads, the multiple pipetting heads are correspondingly arranged on the multiple pipetting assemblies 120, and the power output quantity of each Z-direction driving assembly 130 and the activity quantity of each push rod plunger 124 in the corresponding plunger barrel 123 can be independently controlled, so that the multiple pipetting heads can independently complete the liquid suction and discharge operations at different height positions and different dosages, the flexibility is high, and the requirements of more different liquid suction and discharge scenes can be met.

The first driving source 122 is preferably a servo motor, and because the position accuracy of the servo motor is high, the first driving source 122 is set as the servo motor, so that the movement amount of the push rod plunger 124 can be accurately controlled, the liquid suction amount and the liquid discharge amount of the liquid transfer head can be accurately adjusted, and the accurate control requirement of a user on the dosage of liquid such as reagent is met. Of course, in other situations where the liquid suction and discharge dosage requirement for the liquid discharge head is not high, other driving elements capable of outputting power, such as a driving motor, a driving cylinder, etc., may also be adopted, and the specific type of the first driving source 122 is not limited by the present invention.

In order to automatically disassemble the pipetting head, specifically, as shown in fig. 1, the gun withdrawing assembly 140 includes a second driving source 141 and a gun withdrawing sleeve 142. The second driving source 141 is fixed to the body 121 by screwing, riveting, or the like, the gun withdrawing sleeve 142 is connected to an output end of the second driving source 141, and the gun withdrawing sleeve 142 is slidably sleeved on the plunger barrel 123. When the second driving source 141 outputs power, the gun withdrawing sleeve 142 is driven to slide on the plunger barrel 123, when the gun withdrawing sleeve 142 abuts against the liquid transferring head, the gun withdrawing sleeve 142 continues to slide, acting force applied to the liquid transferring head enables the liquid transferring head to withdraw from the plunger barrel 123, after the liquid transferring head finishes liquid sucking and discharging operation, the liquid transferring head is automatically detached, the used liquid transferring head is conveniently replaced and recycled, and the replacement efficiency of the liquid transferring head is improved. In addition, after the pipetting head is detached, the second driving source 141 reversely outputs power to drive the gun retreating sleeve 142 to slide on the plunger barrel 123, so that the gun retreating sleeve 142 is reset, and the connection between the pipetting head and the plunger barrel 123 can be conveniently completed next time.

As shown in fig. 1, the second driving source 141 is a driving motor or a driving module composed of a power supply and an electromagnet pair. In one embodiment, the second driving source 141 is a driving motor, and the gun withdrawing sleeve 142 is connected to an output end of the driving motor, and the gun withdrawing sleeve 142 is driven by the power output by the driving motor to slide on the plunger barrel 123. In another embodiment, the second driving source 141 is a driving module consisting of a power supply and a pair of electromagnets, one of the pair of electromagnets is fixed on the main body 121 by screwing, riveting or the like, and the other of the pair of electromagnets is connected to the gun withdrawal sleeve 142, so that when the power supply is powered on, the pair of electromagnets has magnetism, and the pair of electromagnets repel or attract each other, thereby driving the gun withdrawal sleeve 142 to slide on the plunger 123. Of course, the second driving source 141 may also be other power elements capable of outputting power, such as a driving cylinder, a servo motor, etc., and the present invention is not limited to the specific type of the second driving source 141.

In order to drive the pipetting head to perform liquid sucking and discharging operations at different height positions, in a preferred embodiment, as shown in fig. 1, the Z-direction driving assembly 130 comprises a third driving source 131 and a sliding module 132. The third driving source 131 is fixed to the frame 110 by screwing, welding, etc., the sliding module 132 is connected to an output end of the third driving source 131, the sliding module 132 can slide along the Z direction, and the sliding module 132 is connected to the body 121. When the third driving source 131 outputs power, the third driving source 131 can drive the sliding module 132 to slide along the Z direction, so that the main body 121 is driven by the sliding module 132 to move along the Z direction, and the liquid-transferring heads connected to the main body 121 are driven to move along the Z direction, so as to independently complete liquid suction and discharge operations at different height positions.

Specifically, as shown in fig. 1, the sliding module 132 includes a first sliding block 1321 and a lead screw 1322. The screw rod 1322 extends in the Z direction, the screw rod 1322 is connected to an output end of the third driving source 131, the first slider 1321 is screwed to the screw rod 1322, and the first slider 1321 is connected to the main body 121. When the third driving source 131 outputs power, the lead screw 1322 connected to the third driving source 131 performs a rotational motion, the engaging position of the first slider 1321 and the lead screw 1322 changes, so that the first slider 1321 slides along the Z direction, and the first slider 1321 drives the main body 121 to perform a follow-up motion, thereby driving the liquid-transferring head connected to the main body 121 to move along the Z direction, so as to independently complete liquid suction and discharge operations at different height positions. Of course, the sliding module 132 is not limited to the screw 1322 and the first sliding block 1321 provided above, and may also be a matching manner of the guide rail and the sliding block or other types, and to the specific type of the sliding module 132, the utility model discloses do not make a limitation, only need satisfy under the power action of the third driving source 131, the sliding module 132 can slide along the Z direction.

The third driving source 131 is preferably a servo motor, and since the position accuracy of the servo motor is high, the third driving source 131 is set as the servo motor, so that the amount of movement of the sliding module 132 can be accurately controlled, the amount of movement of the pipetting head in the Z direction can be accurately adjusted, and the requirement of a user on accurate control of the height position of the pipetting head for liquid suction and discharge can be met. Of course, in other situations where the precision requirement on the height position of the liquid sucking and discharging head is not high, other driving elements capable of outputting power, such as a driving motor, a driving cylinder, etc., may be adopted.

In order to improve the smoothness of the Z-direction sliding of the pipetting unit 120, in a preferred embodiment, as shown in fig. 1, the main body 121 is provided with a plurality of second sliders 1211, and the frame 110 is provided with the guide rail 111 by screwing, welding, or the like. The guide rail 111 extends along the Z direction, the plurality of second sliders 1211 are slidably disposed on the guide rail 111, and the plurality of second sliders 1211 slide along the guide rail 111 to drive the main body 121 to slide along the Z direction, so as to drive the pipetting assembly 120 to slide along the Z direction on the guide rail 111, thereby improving the smoothness of the pipetting assembly 120 sliding along the Z direction, and further prolonging the service life of the pipetting mechanism 100.

In order to obtain the position information of the pipetting module 120 during the movement, in a preferred embodiment, as shown in fig. 1, the pipetting mechanism 100 further comprises a plurality of sensors 150, and the plurality of sensors 150 are uniformly fixed on the frame 110 along the Z direction, i.e. the distance between two adjacent sensors 150 is the same, and the sensors 150 are used for obtaining the position information of the pipetting module 120. The sensor 150 is further externally connected to an external terminal, and after the sensor 150 acquires the positional state information of the liquid transfer unit 120, the positional state information can be fed back to the external terminal, and the external terminal can directly control the movement of the liquid transfer mechanism 100, or the positional state information acquired by the plurality of sensors 150 can be imaged in front of the user and the movement of the liquid transfer mechanism 100 can be controlled by the user.

The sensor 150 may be one of a displacement sensor, a proximity sensor, and a photoelectric sensor. Of course, the sensor 150 can be of other types, and it is only necessary that the sensor 150 can obtain the position status information of the pipetting assembly 120 during the movement of the pipetting assembly 120, and the invention is not limited to the specific type of the sensor 150.

In addition, as shown in fig. 1-3, the present invention further provides a liquid workstation 200. The liquid station 200 includes a rack (not shown) and a plurality of pipetting mechanisms 100 according to the above-described embodiment, and the plurality of pipetting mechanisms 100 are arranged side by side on the rack.

Above-mentioned liquid workstation 200, at first install the liquid transfer head on moving liquid subassembly 120, Z is to drive assembly 130 output power afterwards, the drive moves liquid subassembly 120 and slides along Z on framework 110, drive through moving liquid subassembly 120 and move liquid head and independently accomplish the suction and drainage operation of co-altitude not, treat to move liquid head and accomplish the suction and drainage operation to liquid such as reagent after, move back rifle subassembly 140 and move, promote to move liquid head and withdraw from and move liquid subassembly 120, the liquid transfer head is dismantled in the automation, the operation is changed to the liquid transfer head after the convenience is used, improve the change efficiency of liquid transfer head. A plurality of liquid-transfering mechanism 100 set up side by side in the frame, correspond a plurality of liquid-transfering heads and set up on a plurality of liquid-transfering component 120, and a plurality of liquid-transfering heads can independently accomplish the suction and drainage operation of different height positions, and the flexibility is high, can satisfy more different suction and drainage scene demands.

In order to avoid interference of the Z-direction driving assembly 130 during movement, in a preferred embodiment, as shown in fig. 1 and 2, the Z-direction driving assembly 130 includes a third driving source 131 and a sliding module 132, and two adjacent third driving sources 131 are offset from each other in a plane perpendicular to the Z-direction. In the process of installing the liquid-transfering mechanism 100, the adjacent two third driving sources 131 are mutually staggered in the plane vertical to the Z direction, so that the installation positions of a plurality of liquid-transfering mechanisms 100 are reasonably arranged, and the motion interference of the adjacent two Z-direction driving components 130 can be avoided.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. The utility model provides a move liquid mechanism, its characterized in that includes the framework, move liquid subassembly, move liquid head, Z to drive assembly and move back rifle subassembly, move liquid head detachably connect in move on the liquid subassembly, move liquid subassembly Z to drive assembly all set up in the framework, move liquid subassembly with Z is connected to drive assembly transmission, and can follow Z on the framework and slide to, move back rifle subassembly and be fixed in move liquid subassembly is last, and can promote move liquid head and withdraw from move liquid subassembly.

2. A pipetting mechanism as recited in claim 1 wherein the pipetting assembly comprises a body, a first drive source, a plunger barrel and a plunger, the body is slidably disposed on the frame, the first drive source and the plunger barrel are both fixed to the body, one end of the plunger is connected to an output end of the first drive source, and the other end of the plunger is movably inserted into the plunger barrel, and the pipetting head is detachably connected to an end of the plunger barrel remote from the plunger.

3. A pipetting mechanism as recited in claim 2 wherein the withdrawal gun assembly includes a second drive source secured to the body and a withdrawal gun sleeve connected to an output of the second drive source and slidably received on the plunger barrel.

4. A pipetting mechanism as recited in claim 3 wherein the second drive source is a drive motor or a drive module of a power supply and electromagnet pair.

5. The pipette mechanism according to claim 2, wherein the Z-direction drive unit includes a third drive source fixed to the frame, and a slide module connected to an output end of the third drive source and slidable in the Z-direction, the slide module being connected to the main body.

6. The pipette mechanism according to claim 5, wherein the slide module includes a first slider and a lead screw extending in the Z direction, the lead screw being connected to an output end of the third driving source, the first slider being screwed to the lead screw and being connected to the main body.

7. The pipetting mechanism of claim 2, wherein the body is provided with a plurality of second slides, the frame is provided with a guide rail, and each of the plurality of second slides is slidably disposed on the guide rail.

8. The pipetting mechanism of claim 1, further comprising a plurality of sensors uniformly fixed to the frame in the Z-direction for acquiring positional information of the pipetting assembly.

9. A liquid work station comprising a frame and a plurality of pipetting mechanisms according to any one of claims 1 to 8 arranged side by side on said frame.

10. The liquid work station as claimed in claim 9, wherein the Z-drive assembly includes a third drive source and a slide module, and two adjacent third drive sources are offset from each other in a plane perpendicular to the Z-direction.

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