CN110053057B

CN110053057B - Pipetting assembly

Info

Publication number: CN110053057B
Application number: CN201910351628.9A
Authority: CN
Inventors: 闫林刚; 刘冬平
Original assignee: Shenzhen Wontec Technology Co ltd
Current assignee: Shenzhen Wontec Technology Co ltd
Priority date: 2019-04-28
Filing date: 2019-04-28
Publication date: 2023-08-18
Anticipated expiration: 2039-04-28
Also published as: CN110053057A

Abstract

The invention is suitable for the technical field of medical equipment, and provides a pipetting assembly which comprises a base, a pipetting arm, a rack arranged on the pipetting arm, a supporting block for the rack to slide, a gear meshed with the rack, a rotating shaft for driving the gear to rotate and a driving device for driving the rotating shaft to rotate so as to enable the pipetting arm to move along the axis direction perpendicular to the rotating shaft. Compared with the single transmission mode that the driving device drives the pipetting arm in the vertical direction, the pipetting assembly cancels the occupation space of the driving device in the vertical direction, and has high movement efficiency and small inertia of the pipetting arm.

Description

Pipetting assembly

Technical Field

The invention belongs to the technical field of medical equipment, and particularly relates to a pipetting assembly.

Background

At present, in order to improve pipetting efficiency, automatic pipetting equipment is often adopted to drive a pipetting arm to perform pipetting operations. The automatic pipetting device is provided with an X-axis mechanical arm, a Y-axis mechanical arm and a Z-axis mechanical arm, and can drive the pipetting arm to move in three directions of XYZ axes. However, the driving device for driving the pipetting arm to move in the Z-axis direction is often arranged on a vertical plane, namely, the driving device directly drives the pipetting arm to move in the vertical direction, so that the weight of the pipetting arm in the Z-axis direction is greatly increased, the occupied space of the automatic pipetting device in the Z-axis direction is also increased, the movement inertia of the pipetting arm in the Z-axis direction is large, and the movement efficiency is low.

Disclosure of Invention

The invention aims to provide a pipetting assembly which solves the problems that in the prior art, an automatic pipetting device is large in occupied space driven by the pipetting device in the vertical direction and the pipetting arm is low in movement efficiency in the vertical direction.

In order to achieve the above purpose, the invention adopts the following technical scheme: the pipetting assembly comprises a base, a pipetting arm for taking and placing liquid, a rack arranged on the pipetting arm, a supporting block for guiding the rack to slide, a gear meshed with the rack, a rotating shaft for driving the gear to rotate and a driving device for driving the rotating shaft to rotate so that the gear drives the rack to move up and down; the gear is rotatably arranged on the supporting block, the gear is sleeved on the rotating shaft in a sliding mode, the rack is slidably arranged on the supporting block, and the driving device is arranged on the base and connected with the rotating shaft.

Further, the pipetting arm comprises a liquid storage tube for supporting the sampling head, a piston rod slidably mounted in the liquid storage tube and a power longitudinal moving mechanism for driving the piston rod to move in the liquid storage tube; the power longitudinal moving mechanism is arranged on the rack, the power longitudinal moving mechanism is connected with the piston rod, and the liquid storage tube is slidably arranged on the rack.

Further, the piston rod is hollow, one end of the piston rod is an open end, and the other end of the piston rod is a closed end; the power longitudinal moving mechanism comprises a sliding block connected with the piston rod, a screw rod for driving the sliding block to move and a power mechanism for driving the screw rod to rotate; the sliding block is arranged on the screw rod, one end of the screw rod is connected with the power mechanism, the other end of the screw rod stretches into the piston rod, and the power mechanism is arranged on the rack.

Further, the pipetting arm further comprises a universal stopper for sealing the connection of the piston rod and the slider.

Further, the power mechanism comprises a first rotating gear sleeved and fixed on the screw rod, a second rotating gear meshed with the first rotating gear, a power device for driving the second rotating gear to rotate and a shell for supporting the power device; the power device is connected with the second rotating gear, and the shell is arranged on the rack.

Further, the pipetting arm further comprises a sliding block for removing the sampling head on the liquid storage tube when being abutted with the supporting block and a limiting block for limiting the sliding block to move on the liquid storage tube, the sliding block is sleeved on the liquid storage tube and is abutted with the sampling head on the liquid storage tube, and the limiting block is installed at one end of the rack, which is close to the sliding block.

Further, the liquid storage tube comprises a liquid suction tube for supporting the sampling head and a hollow tube communicated with the liquid suction tube, and the piston rod is slidably arranged in the hollow tube; the pipette arm further comprises a connecting pipe for connecting the pipette with the hollow pipe, a support frame slidably mounted on the connecting pipe, a control main board mounted on the support frame, a reed pipe, a magnet block for controlling the on/off of the reed pipe, and two pole pieces connected with and supporting the reed pipe, wherein the sliding block is sleeved on the connecting pipe, the magnet block is mounted on the sliding block, and the two pole pieces are respectively connected with the control main board.

Further, the pipetting arm further comprises a pressure sensor for measuring the pressure between the end of the piston rod and the liquid level in the pipette when the pipette is filled with liquid, and the pressure sensor is connected with the control main board.

Further, the pipetting assembly further comprises a transverse moving mechanism for driving the pipetting arm to move along the axis direction parallel to the rotating shaft, wherein the transverse moving mechanism comprises a driving wheel and a driven wheel which are respectively rotatably installed on the base, a conveyor belt for connecting the driving wheel and the driven wheel, a connecting block for connecting the conveyor belt with the supporting block, and a transmission device for driving the driving wheel to rotate so that the conveyor belt drives the supporting block to move; the connecting block is slidably mounted on the base, the transmission device is connected with the driving wheel, and the transmission device is mounted on the base.

Further, the pipetting component further comprises a longitudinal moving mechanism for driving the pipetting arm to move along the axis direction perpendicular to the rotating shaft and a bracket for supporting the longitudinal moving mechanism, wherein the longitudinal moving mechanism comprises two rotating wheels which are respectively rotatably arranged on the bracket, a conveying belt for connecting the two rotating wheels, a guide block for connecting the base with the conveying belt and an output device for driving one rotating wheel to rotate; the guide block is slidably mounted on the support, the output device is connected with the corresponding rotating wheel, and the output device is mounted on the support.

The pipetting component provided by the invention has the beneficial effects that: compared with the single transmission mode that the driving device drives the pipetting arm in the vertical direction, the pipetting assembly cancels the occupation space of the driving device in the vertical direction, and has high movement efficiency and small inertia of the pipetting arm.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a pipetting assembly according to an embodiment of the invention;

FIG. 2 is a schematic view of a portion of an exploded view of a pipetting assembly according to an embodiment of the invention;

FIG. 3 is an exploded view of a pipetting arm in accordance with an embodiment of the invention;

FIG. 4 is an enlarged schematic view of FIG. 3 at A;

FIG. 5 is an exploded view of a power mechanism and screw connection provided by an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a sliding block according to an embodiment of the present invention;

fig. 7 is an exploded view of a connection between a longitudinal moving mechanism and a bracket according to an embodiment of the present invention.

Wherein, each reference sign in the figure:

1-a base; 2-racks; 3-supporting blocks; 4-gear; 5-rotating shaft; 6-a driving device;

7-pipetting arm; 71-pipette; 72-hollow tube; 73-a piston rod; 731-slider; 732-screw; 733-a power mechanism; 734—a first rotation gear; 735—a second rotary gear; 736-a power plant; 737-housing; 74-universal stopper ring; 75-sliding blocks; 751-springs; 752-avoidance slots; 753 grooves; 76-limiting blocks; 771-metal tube; 772-insulating tube; 78-supporting frame; 781-a control motherboard; 782-reed switch; 783-a pressure sensor; 784-probe tile; 785-grounding plate; 79-magnet blocks;

8-a lateral movement mechanism; 81-a driving wheel; 82-driven wheel; 83-conveyor belt; 84-connecting blocks; 85-transmission device;

9-a longitudinal movement mechanism; 91-rotating wheel; 92-conveyer belt; 93-output means; 94-a guide block; 941-a first guide groove; 942-second guide groove;

10-sampling head; 11-a bracket; 111-a first rail; 112-a second rail; 113-positioning grooves; 12-removing the head pipe; 13-sliding rails; 14-caterpillar tracks.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present invention, it should be understood that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

For convenience of description, defining three coordinate axes which are mutually perpendicular in space as an X axis, a Y axis and a Z axis, wherein the X axis and the Y axis are two coordinate axes which are mutually perpendicular in the same horizontal plane, and the Z axis is a coordinate axis in the vertical direction; the X axis, the Y axis and the Z axis are positioned on three planes which are mutually perpendicular in space and are respectively an XY plane, a YZ plane and an XZ plane, wherein the XY plane is a horizontal plane, the XZ plane and the YZ plane are vertical planes, and the XZ plane is perpendicular to the YZ plane.

Referring to fig. 1 to 7, a pipetting assembly according to an embodiment of the invention will be described. The pipetting component comprises a base 1, a rotating shaft 5 rotatably arranged on the base 1, a driving device 6 arranged on the base 1 and connected with the rotating shaft 5, a gear 4 sleeved on the rotating shaft 5, a rack 2 meshed with the gear 4 and arranged vertically to the rotating shaft 5, a pipetting arm 7 arranged and fixed on the rack 2, and a supporting block 3 for sliding of the rack 2; the rack 2 is slidably mounted on the support block 3, the support block 3 is sleeved on the rotating shaft 5, and the gear 4 is rotatably mounted on the support block 3 and sleeved on the rotating shaft 5.

Alternatively, the rotating shaft 5 is preferably a spline shaft, and the driving device 6 may drive the rotating shaft 5 to rotate and simultaneously drive the gear 4 to rotate, which is not limited herein.

When the base 1 is disposed on a horizontal plane, the pipetting arm 7 is disposed perpendicular to the rotating shaft 5, and the pipetting arm 7 is disposed on a vertical plane, i.e., in the Z-axis direction. When the driving device 6 drives the gear 4 to rotate through the rotating shaft 5, the rack 2 meshed with the gear 4 can move up and down along the Z-axis direction on the supporting block 3, and then the movement of the pipetting arm 7 in the Z-axis direction can be realized.

Optionally, a sliding groove matched with the rack 2 is formed in the supporting block 3, and the rack 2 can realize positioning sliding along the sliding groove, so that the accuracy of movement of the pipetting arm 7 in the Z-axis direction is improved.

Compared with the prior art, the liquid transferring component provided by the embodiment of the invention has the advantages that the driving device 6 can drive the rotating shaft 5 to rotate, the rotating shaft 5 drives the gear 4 to rotate, the rack 2 meshed with the gear 4 drives the liquid transferring arm 7 to move on the supporting block 3 along the axis direction vertical to the rotating shaft 5, namely, the transmission force of the driving device 6 in the horizontal direction is converted into the transmission force of the driving device in the vertical direction through the gear 4 and the rack 2, so that the movement of the liquid transferring arm 7 in the vertical direction is realized, compared with the single transmission mode of the driving device 6 in the vertical direction for driving the liquid transferring arm 7, the liquid transferring component omits the occupied space of the driving device 6 in the vertical direction, and the movement efficiency of the liquid transferring arm 7 is high and the inertia is small.

Further, referring to fig. 3 to 5, as a specific implementation of the pipetting assembly according to the embodiment of the invention, the pipetting arm 7 includes a liquid storage tube (not shown) for supporting the sampling head 10, a piston rod 73 slidably mounted in the liquid storage tube, and a power output mechanism (not shown) for driving the piston rod 73 to move in the liquid storage tube; the power take-off is mounted at the end of the rack 2, which is connected to the piston rod 73, and the reservoir is slidingly mounted on the rack 2. In this structure, when the driving device 6 drives the pipetting arm 7 to move to the preset position in the Z-axis direction, the power output mechanism drives the piston rod 73 to move in the liquid storage tube at this time, and the automatic pipetting operation can be realized by matching with the sampling head 10, so that the working efficiency of the pipetting assembly can be improved compared with the manual pipetting operation in the prior art.

Further, referring to fig. 3 to 5, as a specific implementation of the pipetting assembly according to the embodiment of the invention, the piston rod 73 is hollow, one end of the piston rod 73 is an open end, and the other end of the piston rod 73 is a closed end; the power output mechanism comprises a sliding block 731 connected with the piston rod 73, a screw 732 for driving the sliding block 731 to move and a power mechanism 733 for driving the screw 732 to rotate; the slider 731 is mounted on the screw 732, one end of the screw 732 is connected to the power mechanism 733, the other end extends into the piston rod 73 at the opening end of the piston rod 73, and the power mechanism 733 is mounted on the rack 2. In this structure, when the power mechanism 733 drives the screw 732 to rotate, the slider 731 can move up and down on the screw 732, and the piston rod 73 connected to the slider 731 can also move in the liquid storage tube, so as to cooperate with the sampling head 10 to realize automatic liquid taking and discharging operation.

Further, referring to fig. 3, as an embodiment of the pipetting assembly according to the present invention, the pipetting arm 7 further comprises a universal stopper 74 for sealing the connection between the piston rod 73 and the slide 731. With this structure, the sealing performance of the connection between the piston rod 73 and the slider 731 can be effectively improved by the universal stopper 74, and the contamination of the target liquid caused by the entry of external impurities into the liquid storage tube can be effectively avoided.

Further, referring to fig. 5, as a specific implementation of the pipetting assembly according to the embodiment of the invention, the power mechanism 733 includes a first rotating gear 734 sleeved and fixed on the screw 732, a second rotating gear 735 meshed with the first rotating gear 734, a power device 736 for driving the second rotating gear 735 to rotate, and a casing 737 for supporting the power device 736; the power unit 736 is coupled to a second rotary gear 735, and a housing 737 is mounted to the rack 2. In this structure, when the power device 736 drives the second rotating gear 735 to rotate, the first rotating gear 734 engaged with the second rotating gear 735 also rotates together, so as to drive the screw 732 to rotate. The gear is used for transmission, and the device has the advantages of high transmission precision, high efficiency, compact structure, long service life and the like.

Optionally, the transmission ratio of the first rotating gear 734 to the second rotating gear 735 is greater than 1, that is, the smaller second rotating gear 735 drives the larger first rotating gear 734 to rotate, so that the power output efficiency of the power unit 736 can be improved, and time and effort can be saved.

Alternatively, the transmission ratio of the first rotating gear 734 to the second rotating gear 735 may be smaller than 1, that is, the larger second rotating gear 735 drives the smaller first rotating gear 734, so as to increase the rotation speed of the first rotating gear 734, further increase the movement speed of the piston rod 73, and increase the liquid taking and placing speed.

In other embodiments, the ratio of the first rotating gear 734 to the second rotating gear 735 may be equal to 1, which is not limited only herein.

Further, referring to fig. 2, fig. 4 and fig. 6 together, as a specific implementation of the pipetting assembly according to the embodiment of the invention, the pipetting arm 7 further includes a sliding block 75 for removing the sampling head 10 from the liquid storage tube when abutting against the support block 3, and a limiting block 76 for limiting the sliding block 75 to move on the liquid storage tube, wherein the sliding block 75 is sleeved on the liquid storage tube and abuts against the sampling head 10, and the limiting block 76 is mounted at one end of the rack 2 close to the sliding block 75. In this structure, the gear 4 drives the rack 2 to move upwards on the supporting block 3, when the lower end of the supporting block 3 is abutted against the upper end of the sliding block 75, the sliding block 75 does not rise continuously along with the continuous upward movement of the rack 2, and the liquid storage pipe drives the sampling head 10 to rise continuously, so that the sliding block 75 can fade the sampling head 10 from the liquid storage pipe, the automatic fade-out operation of the sampling head 10 is realized, and compared with the traditional manual change operation of the sampling head 10, the operation efficiency is greatly improved.

Optionally, the liquid storage tube is sleeved with a head removing tube 12, and the head removing tube 12 is located between the sliding block 75 and the sampling head 10. This configuration effectively extends the length of the reservoir tube by removing the head tube 12 and avoids direct contact between the slider 75 and the sampling head 10. In the process of removing the sampling head 10, the sliding block 75 pushes the removing head pipe 12, and the removing head pipe 12 removes the sampling head 10, so that the removing reliability of the sampling head 10 can be improved.

Further, referring to fig. 2 to 4 together, as a specific implementation of the pipetting assembly according to the embodiment of the invention, the liquid storage tube includes a liquid suction tube 71 for supporting the sampling head 10 and a hollow tube 72 in communication with the liquid suction tube 71, and the piston rod 73 is slidably mounted in the hollow tube 72; the pipetting arm 7 further comprises a connecting pipe (not shown) for connecting the pipette 71 with the hollow pipe 72, a support frame 78 slidably mounted on the connecting pipe, a control main board 781 mounted on the support frame 78, a reed switch 782, a magnet block 79 for controlling the on or off of the reed switch 782, and two pole pieces connected with and supporting the reed switch 782, wherein the magnet block 79 is mounted on the sliding block 75, and the two pole pieces are respectively connected with the control main board 781. In this structure, the two pole pieces are a probe piece 784 and a grounding piece 785, respectively. In this structure, when the sliding block 75 is removed from the sampling head 10, the magnet block 79 on the sliding block 75 gradually approaches the reed switch 782, the reed switch 782 is turned on, the detecting plate 784 is disconnected from the grounding plate 785, and the control main board 781 cannot receive the capacitance signal formed between the detecting plate 784 and the grounding plate 785, so as to determine that the sampling head 10 is not on the liquid suction pipe 71; conversely, when the magnet block 79 gradually gets far away from the reed switch 782, the reed switch 782 is turned off, the detecting plate 784 is turned on with the grounding plate 785, and the control main board 781 can receive the capacitance signal formed between the detecting plate 784 and the grounding plate 785 to determine that the sampling head 10 is present on the liquid suction pipe 71. Therefore, the pipetting module can automatically judge whether the sampling head 10 exists or not, prevent the sampling head 10 from falling off and being unrecognizable due to external collision in the pipetting process, and improve the use reliability of the pipetting module.

Alternatively, the connection pipe includes a metal pipe 771 and an insulation pipe 772, and the metal pipe 771 and the insulation pipe 772 are respectively installed at both sides of the support frame 78. One end of the metal tube 771 is communicated with the pipette 71, and the other end is communicated with the insulating tube 772; the other end of the insulating tube 772 communicates with the hollow tube 72. One end of the detecting sheet 784 is connected to the control main board 781, the other end is mounted on the metal tube 771, one end of the grounding sheet 785 is connected to the control main board 781, and the other end is mounted on the insulating tube 772 to realize grounding. When the magnet 79 is far away from the reed switch 782, the reed switch 782 is disconnected, and the detecting piece 784 and the grounding piece 785 are conducted and have capacitance signals. On the basis, when the pipetting arm 7 does not perform pipetting operations, an air medium is arranged between the detecting plate 784 and the grounding plate 785; when the pipetting arm 7 is pipetting, the medium between the detecting plate 784 and the grounding plate 785 is liquid and air as the liquid level in the pipette 71 is gradually raised and is in contact with the metal tube 771, and the capacitance signal between the detecting plate 784 and the grounding plate 785 is also changed as the liquid level is continuously raised. Therefore, by changing the capacitance signal between the detecting plate 784 and the grounding plate 785 through the continuous change of the liquid level, the liquid level in the liquid suction pipe 71 can be effectively monitored in real time, and the liquid level height in the liquid suction pipe 71 can be effectively judged.

Optionally, a spring 751 is provided on the sliding block 75, and one end of the supporting frame 78 may be connected to the spring 751. When the sliding block 75 drives the magnet block 79 to be far away from the reed switch 782, the gear 4 drives the rack 2 to move downwards, the sliding block 75 gradually returns to the initial position under the pushing of the elastic force of the spring 751, and the limiting block 76 limits the sliding block, so that the sliding block 75 is prevented from moving on the connecting pipe beyond the preset stroke.

Optionally, the sliding block 75 is provided with a avoiding groove 752 for accommodating the reed switch 782. Alternatively, the avoidance groove 752 is provided along the axial direction of the connection pipe. In this structure, the avoidance groove 752 is arranged to avoid the reed switch 782, so that the movement of the sliding block 75 on the connecting pipe can be effectively realized, the magnet block 79 is convenient to approach or separate from the reed switch 782, and a certain limiting guide function is also realized.

Optionally, the sliding block 75 is further provided with a groove 753 for mounting the supporting magnet block 79, and the magnet block 79 is mounted in the groove 753. This structure through setting up recess 753, can realize the quick location installation of magnet piece 79, the dismouting of also being convenient for magnet piece 79, easy dismounting.

Further, referring to fig. 4, as an embodiment of the pipetting assembly according to the present invention, the pipetting arm 7 further includes a pressure sensor 783 for measuring the pressure between the end of the piston rod 73 and the liquid level in the pipette 71 when the pipette 71 is filled with liquid, and the pressure sensor 783 is electrically connected to the control main board 781. With this structure, when the pipetting operation is performed, a negative pressure is formed between the bottom of the piston rod 73 and the liquid surface in the pipette 71, and if the sampling head 10 is clogged, the negative pressure is rapidly increased, the pressure sensor 783 senses the increased negative pressure, and the sampling head 10 is determined to be damaged, and the worker is reminded of timely replacement. In the same way, when the tapping operation is performed, a positive pressure is formed between the bottom of the piston rod 73 and the liquid level in the liquid suction pipe 71, if the sampling head 10 is blocked, the positive pressure can be rapidly increased, the pressure sensor 783 senses the increased positive pressure, the sampling head 10 is considered to be damaged, and the staff is reminded of timely replacement. Therefore, the pressure sensor 783 detects the pressure between the piston rod 73 and the liquid surface in the liquid suction pipe 71, so that whether the sampling head 10 is damaged, blocked or not can be detected, and the test sensitivity is high, and the test is convenient and quick.

Further, referring to fig. 1 and fig. 2 together, as a specific implementation manner of the pipetting assembly provided by the embodiment of the invention, the pipetting assembly further includes a lateral movement mechanism 8 for driving the pipetting arm 7 to move along the axis direction parallel to the rotating shaft 5, the lateral movement mechanism 8 includes a driving wheel 81 and a driven wheel 82 rotatably mounted on the base 1, a conveyor belt 83 connecting the driving wheel 81 and the driven wheel 82, a connecting block 84 connecting the conveyor belt 83 and the supporting block 3, and a transmission device 85 for driving the driving wheel 81 to rotate so as to drive the supporting block 3 to move; the connecting block 84 slidable mounting is on base 1, and the one end of connecting block 84 links to each other with conveyer 83, and the other end links to each other with supporting shoe 3, and transmission 85 links to each other with action wheel 81, and transmission 85 installs on base 1. In this structure, when the driving device 85 drives the conveyor belt 83 to rotate through the driving wheel 81 and the driven wheel 82, the connecting block 84 connected with the conveyor belt 83 is also driven to move, and the supporting block 3 is also driven to move in the process that the connecting block 84 slides on the base 1, so that the movement of the pipetting arm 7 along the Y-axis direction on the horizontal plane is realized.

Optionally, the base 1 is provided with a sliding rail 13, and the connecting block 84 is provided with a sliding groove matched with the sliding rail 13, so that the directional movement of the connecting block 84 can be realized, and the moving accuracy of the connecting block 84 is improved. Optionally, the driving wheel 81 and the driven wheel 82 are provided with latches, so as to improve connection reliability with the conveyor belt 83, effectively prevent slipping of the conveyor belt 83, and improve transmission availability between the driving wheel 81 and the driven wheel 82, which is not limited only herein.

Further, referring to fig. 1 and fig. 7 together, as a specific implementation manner of the pipetting assembly provided by the embodiment of the invention, the pipetting assembly further includes a longitudinal moving mechanism 9 for driving the transverse moving mechanism 8 to move along the axis direction perpendicular to the rotating shaft 5 and a bracket 11 for supporting the longitudinal moving mechanism 9, wherein the longitudinal moving mechanism 9 includes two rotating wheels 91 rotatably mounted on the bracket 11, a conveying belt 92 connecting the two rotating wheels 91, a guide block 94 connecting the base 1 and the conveying belt 92, and an output device 93 for driving one of the rotating wheels 91 to rotate; the guide block 94 is slidably mounted on the support 11, one end of the guide block 94 is connected with the conveyor belt 92, the other end is connected with the base 1, the output device 93 is connected with the corresponding rotating wheel 91, and the output device 93 is mounted on the support 11. In this structure, when the output device 93 drives the rotating wheel 91 and the conveyor belt 92 to rotate, the guide block 94 is also driven to slide on the support 11, and the base 1 connected to the guide block 94 moves in the X-axis direction on the horizontal plane, so that the movement of the pipetting arm 7 in the X-axis direction can be realized. Therefore, the pipetting assembly can drive the pipetting arm 7 to move along the Z-axis direction through the cooperation among the driving device 6, the rotating shaft 5, the gear 4 and the rack 2, can drive the pipetting arm 7 to move along the Y-axis direction through the transverse moving mechanism 8, can drive the pipetting arm 7 to move along the X-axis direction through the longitudinal moving mechanism 9, and further can realize the movement of the pipetting arm 7 in the XYZ-axis direction.

Alternatively, the bracket 11 is provided with a first guide rail 111 and a second guide rail 112, and the guide block 94 is provided with a first guide groove 941 matching with the first guide rail 111 and a second guide groove 942 matching with the second guide rail 112, respectively. By the cooperation of the first guide rail 111 with the first guide groove 941 and the second guide rail 112 with the second guide groove 942, the accuracy of the movement of the guide block 94 on the bracket 11 can be improved. Optionally, latches are disposed on both the two rotating wheels 91 to improve connection reliability with the conveyor belt 92, effectively prevent slipping of the conveyor belt 92, and improve transmission availability between the two rotating wheels 91, which is not limited only herein.

Optionally, the pipetting assembly further comprises a positioning groove 113 arranged on the bracket 11 and a crawler 14 with one end installed in the positioning groove 113 and the other end connected with the base 1. The positioning groove 113 can play a certain role in positioning the crawler belt 14, and the accuracy and reliability of the movement of the pipetting arm 7 along the X-axis direction are further improved through the cooperation of the crawler belt 14 and the positioning groove 113.

Alternatively, the driving device 6, the power device 736, the transmission device 85 and the output device 93 may be motors, which are not limited herein.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims

1. A pipetting assembly, characterized in that: the device comprises a base, a pipetting arm for taking and placing liquid, a rack arranged on the pipetting arm, a supporting block for guiding the rack to slide, a gear meshed with the rack, a rotating shaft for driving the gear to rotate and a driving device for driving the rotating shaft to rotate so that the gear drives the rack to move up and down; the gear is rotatably arranged on the supporting block, the gear is sleeved on the rotating shaft in a sliding manner, the rack is slidably arranged on the supporting block, and the driving device is arranged on the base and connected with the rotating shaft;

the liquid transferring arm comprises a liquid storage pipe for supporting the sampling head, a piston rod slidably arranged in the liquid storage pipe and a power output mechanism for driving the piston rod to move in the liquid storage pipe; the power output mechanism is arranged on the rack, the power output mechanism is connected with the piston rod, and the liquid storage tube is slidably arranged on the rack;

the liquid transferring arm further comprises a sliding block for removing the sampling head on the liquid storage pipe when the sliding block is in butt joint with the supporting block and a limiting block for limiting the sliding block to move on the liquid storage pipe, the sliding block is sleeved on the liquid storage pipe and is in butt joint with the sampling head on the liquid storage pipe, and the limiting block is arranged at one end of the rack close to the sliding block; the liquid storage pipe is sleeved with a head removing pipe, and the head removing pipe is positioned between the sliding block and the sampling head;

the liquid storage tube comprises a liquid suction tube for supporting the sampling head and a hollow tube communicated with the liquid suction tube, and the piston rod is slidably arranged in the hollow tube; the pipette arm further comprises a connecting pipe for connecting the pipette with the hollow pipe, a support frame slidably mounted on the connecting pipe, a control main board mounted on the support frame, a reed pipe, a magnet block for controlling the on/off of the reed pipe, and two pole pieces connected with and supporting the reed pipe, wherein the sliding block is sleeved on the connecting pipe, the magnet block is mounted on the sliding block, and the two pole pieces are respectively connected with the control main board.

2. The pipetting assembly of claim 1 wherein: the piston rod is hollow, one end of the piston rod is an open end, and the other end of the piston rod is a closed end; the power output mechanism comprises a sliding block connected with the piston rod, a screw rod for driving the sliding block to move and a power mechanism for driving the screw rod to rotate; the sliding block is arranged on the screw rod, one end of the screw rod is connected with the power mechanism, the other end of the screw rod stretches into the piston rod, and the power mechanism is arranged on the rack.

3. The pipetting assembly of claim 2 wherein: the pipetting arm further comprises a universal stopper for sealing the connection of the piston rod and the slider.

4. The pipetting assembly of claim 2 wherein: the power mechanism comprises a first rotating gear sleeved and fixed on the screw rod, a second rotating gear meshed with the first rotating gear, a power device for driving the second rotating gear to rotate and a shell for supporting the power device; the power device is connected with the second rotating gear, and the shell is arranged on the rack.

5. The pipetting assembly of claim 1 wherein: the pipetting arm further comprises a pressure sensor for measuring the pressure between the end part of the piston rod and the liquid level in the pipette when the pipette is filled with liquid, and the pressure sensor is connected with the control main board.

6. The pipetting assembly as recited in any one of claims 1-5 wherein: the pipetting assembly further comprises a transverse moving mechanism for driving the pipetting arm to move along the axis direction parallel to the rotating shaft, wherein the transverse moving mechanism comprises a driving wheel and a driven wheel which are respectively rotatably arranged on the base, a conveying belt for connecting the driving wheel with the driven wheel, a connecting block for connecting the conveying belt with the supporting block, and a transmission device for driving the driving wheel to rotate so that the conveying belt drives the supporting block to move; the connecting block is slidably mounted on the base, the transmission device is connected with the driving wheel, and the transmission device is mounted on the base.

7. The pipetting assembly as recited in claim 6 wherein: the pipetting assembly further comprises a longitudinal moving mechanism for driving the pipetting arm to move along the axis direction perpendicular to the rotating shaft and a bracket for supporting the longitudinal moving mechanism, wherein the longitudinal moving mechanism comprises two rotating wheels which are respectively rotatably arranged on the bracket, a conveying belt for connecting the two rotating wheels, a guide block for connecting the base with the conveying belt and an output device for driving one rotating wheel to rotate; the guide block is slidably mounted on the support, the output device is connected with the corresponding rotating wheel, and the output device is mounted on the support.