CN209970745U

CN209970745U - Pipetting assembly

Info

Publication number: CN209970745U
Application number: CN201920613364.5U
Authority: CN
Inventors: 闫林刚; 刘冬平
Original assignee: Shenzhen Daken Technology Co Ltd
Current assignee: Shenzhen Daken Technology Co Ltd
Priority date: 2019-04-28
Filing date: 2019-04-28
Publication date: 2020-01-21
Anticipated expiration: 2029-04-28

Abstract

The utility model is suitable for a medical equipment technical field provides a move liquid subassembly, including the base, move the liquid arm, install rack on moving the liquid arm, supply the gliding supporting shoe of rack, with rack toothing's gear, be used for driving gear revolve's pivot and be used for driving the pivot and rotate so that move the drive arrangement that the axis direction of liquid arm edge perpendicular to pivot removed. Compared with the prior art, the utility model discloses a drive arrangement can drive the pivot and rotate, the pivot drives gear revolve in the lump, the rack with gear engagement drives move the liquid arm on the supporting shoe and remove along the axis direction of perpendicular to pivot, be about to the transmission power on the drive arrangement horizontal direction and convert vertical ascending transmission power into through wheel and rack, thereby realize moving the liquid arm and move the removal of liquid arm in vertical ascending, compare in the single transmission mode that drive arrangement drove the liquid arm in vertical direction, this move the liquid subassembly and cancelled drive arrangement at vertical ascending occupation space of side, move the mobility efficiency of liquid arm high, inertia is little.

Description

Pipetting assembly

Technical Field

The utility model belongs to the technical field of medical equipment, more specifically say, relate to a move liquid subassembly.

Background

At present, in order to improve liquid transfer efficiency, often adopt automatic liquid transfer equipment to drive and move liquid arm and get liquid operation. The automatic liquid-transfering equipment has X-axis mechanical arm, Y-axis mechanical arm and Z-axis mechanical arm, and can drive the liquid-transfering arm to move in three directions of XYZ axis. However, the driving device driving the pipetting arm to move in the Z-axis direction is often arranged on a vertical plane, that is, the driving device directly gives the pipetting arm the transmission force in the vertical direction, the weight of the pipetting arm in the Z-axis direction is greatly increased by the design, the occupied space of the automatic pipetting device in the Z-axis direction is also increased, the moving inertia of the pipetting arm in the Z-axis direction is large, and the moving efficiency is not high.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a move liquid subassembly to it is big to solve the automatic liquid equipment that moves that exists among the prior art and drive the ascending occupation space in vertical side, moves the problem that liquid arm moving efficiency is low in vertical side.

In order to achieve the above object, the utility model adopts the following technical scheme: providing a liquid transfer assembly, which comprises a base, a liquid transfer arm for taking and placing liquid, a rack arranged on the liquid transfer 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 installed on the supporting block, the gear is slidably sleeved on the rotating shaft, the rack is slidably installed on the supporting block, and the driving device is installed on the base and connected with the rotating shaft.

Further, the liquid-transfering arm comprises a liquid storage tube for supporting the sampling head, a piston rod arranged in the liquid storage tube in a sliding manner 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 and connected with the piston rod, and the liquid storage pipe is slidably arranged on the rack.

Furthermore, 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 used for driving the sliding block to move and a power mechanism used for driving the screw rod to rotate; the sliding block is installed on the screw rod, one end of the screw rod is connected with the power mechanism, the other end of the screw rod extends into the piston rod, and the power mechanism is installed on the rack.

Further, the pipetting arm also comprises a plunger ring for sealing the connection position of the piston rod and the sliding block.

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

Further, move liquid arm still including be used for with the supporting shoe during the butt fade the sliding block of the sampling head on the stock solution pipe with be used for restricting the sliding block is in the stock solution pipe goes up the stopper that removes, the sliding block cover locate on the stock solution pipe and with sampling head looks butt on the stock solution pipe, the stopper install in the rack is close to the one end of sliding block.

Further, the liquid storage pipe comprises a pipette for supporting a sampling head and a hollow pipe communicated with the pipette, and the piston rod is slidably mounted in the hollow pipe; the liquid transfer arm further comprises a connecting pipe for communicating the liquid suction pipe 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 reed pipe to be switched on or off and two pole pieces connected with and supporting the reed pipe, the connecting pipe is sleeved with the sliding block, the magnet block is mounted on the sliding block, and the two pole pieces are respectively connected with the control main board.

Further, the liquid-transferring arm also comprises a pressure sensor which is used for measuring the pressure between the end part of the piston rod and the liquid level in the liquid-transferring pipe when the liquid-transferring pipe is filled with liquid, and the pressure sensor is connected with the control main board.

Further, the liquid transfer assembly further comprises a transverse moving mechanism for driving the liquid transfer arm to move along the axis direction parallel to the rotating shaft, and the transverse moving mechanism comprises a driving wheel and a driven wheel which are respectively rotatably mounted on the base, a conveying belt for connecting the driving wheel and the driven wheel, a connecting block for connecting the conveying belt and 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.

Further, the liquid-transfering component also comprises a longitudinal moving mechanism for driving the liquid-transfering arm to move along the axial direction perpendicular to the rotating shaft and a bracket for supporting the longitudinal moving mechanism, wherein the longitudinal moving mechanism comprises two rotating wheels respectively rotatably mounted on the bracket, a conveying belt connected with the two rotating wheels, a guide block connecting the base with the conveying belt and an output device for driving one of the rotating wheels 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 utility model provides a move liquid subassembly's beneficial effect lies in: compared with the prior art, the utility model discloses a drive arrangement can drive the pivot and rotate, the pivot drives gear revolve in the lump, the rack with gear engagement drives move the liquid arm on the supporting shoe and remove along the axis direction of perpendicular to pivot, be about to the transmission power on the drive arrangement horizontal direction and convert vertical ascending transmission power into through wheel and rack, thereby realize moving the liquid arm and move the removal of liquid arm in vertical ascending, compare in the single transmission mode that drive arrangement drove the liquid arm in vertical direction, this move the liquid subassembly and cancelled drive arrangement at vertical ascending occupation space of side, move the mobility efficiency of liquid arm high, inertia is little.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a liquid-transfering assembly provided by an embodiment of the present invention;

fig. 2 is a schematic diagram of a partial explosion of a pipetting assembly provided by an embodiment of the present invention;

fig. 3 is an exploded schematic view of a pipetting arm provided by an embodiment of the present invention;

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

fig. 5 is an exploded schematic view of the connection between the power mechanism and the screw rod according to the 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 schematic view of the connection between the longitudinal moving mechanism and the support according to the embodiment of the present invention.

Wherein, in the figures, the respective reference numerals:

1-a base; 2-a rack; 3-a support block; 4-a gear; 5-a rotating shaft; 6-a drive device;

7-a pipetting arm; 71-a pipette; 72-a hollow tube; 73-a piston rod; 731-sliding block; 732-lead screw; 733-power mechanism; 734-a first rotation gear; 735 — a second rotating gear; 736-a power plant; 737-a housing; 74-a stopper ring; 75-a slider; 751-a spring; 752-avoidance groove; 753-grooves; 76-a limiting block; 771-metal tube; 772-insulating tube; 78-a support frame; 781-control the main board; 782-reed pipe; 783-a pressure sensor; 784-detection segment; 785-a grounding plate; 79-magnet block;

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

9-a longitudinal movement mechanism; 91-a rotating wheel; 92-a conveyor belt; 93-an output device; 94-a guide block; 941-first guide groove; 942 — a second channel;

10-a sampling head; 11-a scaffold; 111-a first guide rail; 112-a second guide rail; 113-a positioning groove; 12-a head-fading pipe; 13-a slide rail; 14-track.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

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

In the description of the present invention, it is to 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 those 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.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

For convenience of description, three coordinate axes which are mutually vertical in space are defined as an X axis, a Y axis and a Z axis respectively, wherein the X axis and the Y axis are two coordinate axes which are mutually vertical on 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 in space and are mutually vertical, and three planes 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 vertical to the YZ plane.

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

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

When the base 1 is arranged on a horizontal plane, the pipetting arm 7 is arranged perpendicular to the rotating shaft 5, and the pipetting arm 7 is located on a vertical plane, namely 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 on the supporting block 3 along the Z-axis direction, and further the moving arm 7 can move in the Z-axis direction.

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

The embodiment of the utility model provides a move liquid subassembly, compared with the prior art, the utility model discloses a drive arrangement 6 can drive pivot 5 and rotate, pivot 5 drives gear 4 in the lump and rotates, 2 drive with gear 4 meshing's rack move liquid arm 7 on supporting shoe 3 and along the axis direction removal of perpendicular to pivot 5, be about to the transmission power on the drive arrangement 6 horizontal direction and convert vertical ascending transmission power into through gear 4 and rack 2, thereby realize moving liquid arm 7 and move the ascending removal of liquid arm 7 in vertical side, compare in drive arrangement 6 and drive the single drive mode who moves liquid arm 7 in vertical side, this move liquid subassembly and cancelled drive arrangement 6 occupation space in vertical side, move liquid arm 7's removal efficiency height, inertia is little.

Further, referring to fig. 3 to fig. 5, as a specific implementation manner of the liquid-transferring assembly provided by the embodiment of the present invention, the liquid-transferring 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 output mechanism is arranged at the end part of the rack 2, the power output mechanism is connected with the piston rod 73, and the liquid storage pipe is arranged on the rack 2 in a sliding way. This structure, when drive arrangement 6 drives move liquid arm 7 and remove to when predetermineeing the position in the Z axle direction, power take off mechanism drives piston rod 73 and removes in the liquid storage tube this moment, and cooperation sampling head 10 can realize getting automatically and put the liquid operation, compares in the artifical manual work of tradition and gets and put the liquid, can improve the work efficiency who moves the liquid subassembly.

Further, referring to fig. 3 to fig. 5, as a specific implementation manner of the liquid-transfering assembly according to the embodiment of the present 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 rod 732 for driving the sliding block 731 to move and a power mechanism 733 for driving the screw rod 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 of the screw 732 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. With the structure, when the power mechanism 733 drives the screw 732 to rotate, the sliding block 731 can move up and down on the screw 732, and the piston rod 73 connected with the sliding block 731 can also move in the liquid storage tube, so that the automatic liquid taking and placing operation can be realized by matching with the sampling head 10.

Further, referring to fig. 3, as a specific implementation manner of the liquid-transfering assembly provided by the embodiment of the present invention, the liquid-transfering arm 7 further includes a universal plug ring 74 for sealing the connection between the piston rod 73 and the sliding block 731. This structure can effectively improve the sealing performance who is connected between piston rod 73 and slider 731 through general stopper ring 74, effectively avoids during outside impurity gets into the liquid storage pipe, causes the pollution to the target liquid.

Further, referring to fig. 5, as a specific implementation manner of the pipetting assembly according to the embodiment of the present invention, the power mechanism 733 includes a first rotating gear 734 fixed to the screw 732 in a sleeved manner, a second rotating gear 735 engaged with the first rotating gear 734, a power device 736 for driving the second rotating gear 735 to rotate, and a housing 737 for supporting the power device 736; the power unit 736 is connected to the second rotating gear 735, and the housing 737 is mounted to the rack 2. With this structure, when the power unit 736 drives the second rotating gear 735 to rotate, the first rotating gear 734 engaged with the second rotating gear 735 also rotates, and further drives the screw 732 to rotate. The transmission is carried out through the gear, and the transmission 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 device 736 can be improved, and time and labor are saved.

Or, the transmission ratio of the first rotating gear 734 to the second rotating gear 735 may also be smaller than 1, that is, the larger second rotating gear 735 drives the smaller first rotating gear 734, so that the rotating speed of the first rotating gear 734 may be increased, the moving speed of the piston rod 73 may be increased, and the liquid taking and discharging speed may be increased.

In other embodiments, the transmission ratio of the first rotation gear 734 to the second rotation gear 735 may also be equal to 1, and is not limited herein.

Further, please refer to fig. 2, fig. 4 and fig. 6 together, as a specific implementation manner of the liquid-transfering assembly provided by the embodiment of the present invention, the liquid-transfering arm 7 further includes a sliding block 75 for removing the sampling head 10 on the liquid storage tube when abutting against the supporting block 3 and a limiting block 76 for limiting the sliding block 75 to move on the liquid storage tube, the sliding block 75 is sleeved on the liquid storage tube and abuts against the sampling head 10, and the limiting block 76 is installed at one end of the rack 2 close to the sliding block 75. This structure, gear 4 drives rack 2 at the in-process of 3 shanks of supporting shoe, when the lower extreme of supporting shoe 3 and the upper end butt of sliding block 75, along with rack 2 continues the in-process of upward movement, sliding block 75 no longer continues to rise, because the stock solution pipe drives sampling head 10 and continues to rise, sliding block 75 can fade sampling head 10 from the stock solution pipe, thereby realize the automatic operation that fades sampling head 10, compare in the artifical operation of changing sampling head 10 of tradition, the operating efficiency has greatly been improved.

Optionally, a head-removing tube 12 is sleeved on the liquid storage tube, and the head-removing tube 12 is located between the sliding block 75 and the sampling head 10. This structure, through the length that can effectively prolong the stock solution pipe of tube 12 of taking off to and avoid the direct contact of sliding block 75 and sampling head 10. In the process of fading the sampling head 10, the sliding block 75 pushes the fading pipe 12, and the fading pipe 12 fades the sampling head 10, so that the fading reliability of the sampling head 10 can be improved.

Further, referring to fig. 2 to 4 together, as a specific implementation manner of the liquid-transfering assembly provided by the embodiment of the present invention, the liquid-transferring tube includes a liquid-transfering tube 71 for supporting the sampling head 10 and a hollow tube 72 communicated with the liquid-transfering tube 71, and a piston rod 73 is slidably installed in the hollow tube 72; the pipetting arm 7 further comprises a connecting pipe (not shown) for communicating 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 pipe 782, a magnet block 79 for controlling the on/off of the reed pipe 782, and two pole pieces connected with and supporting the reed pipe 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 the structure, the two pole pieces are a detection piece 784 and a grounding piece 785 respectively. With the structure, when the sliding block 75 is removed from the sampling head 10, the magnet 79 on the sliding block 75 gradually approaches the reed pipe 782, at this time, the reed pipe 782 is conducted, the detection piece 784 is disconnected from the grounding piece 785, at this time, the control main board 781 cannot receive a capacitance signal formed between the detection piece 784 and the grounding piece 785, and it is determined that the sampling head 10 is not on the pipette 71; conversely, when the magnet block 79 gradually moves away from the reed pipe 782, the reed pipe 782 is disconnected, the detection piece 784 and the grounding piece 785 are connected, and the control main board 781 can receive a capacitance signal formed between the detection piece 784 and the grounding piece 785 and determine that the sampling head 10 is present on the pipette 71. Therefore, the liquid-transfering component can automatically judge whether the sampling head 10 exists or not, prevent the sampling head 10 from falling off and being unidentified due to external collision in the liquid-transfering process, and improve the use reliability of the liquid-transfering component.

Alternatively, the connecting tube includes a metal tube 771 and an insulating tube 772, and the metal tube 771 and the insulating tube 772 are respectively installed at both sides of the supporting frame 78. One end of the metal tube 771 communicates with the pipette 71, and the other end communicates with the insulating tube 772; the other end of the insulating tube 772 communicates with the hollow tube 72. One end of the detection sheet 784 is connected with the control main board 781, the other end of the detection sheet is installed on the metal tube 771, one end of the grounding sheet 785 is connected with the control main board 781, and the other end of the grounding sheet 785 is installed on the insulating tube 772 to achieve grounding. When the magnet block 79 moves away from the reed pipe 782, the reed pipe 782 is disconnected, and the detection piece 784 and the grounding piece 785 are conducted and have capacitance signals. On the basis, when the liquid-taking operation is not carried out by the liquid-moving arm 7, an air medium is arranged between the detection sheet 784 and the grounding sheet 785; when the liquid is taken out by the pipette arm 7, as the liquid level in the pipette tube 71 gradually rises and contacts with the metal tube 771, the medium between the detection sheet 784 and the grounding sheet 785 is liquid and air, and as the liquid level continuously rises, the capacitance signal between the detection sheet 784 and the grounding sheet 785 changes. Therefore, through the continuous change of the liquid level, the capacitance signal between the detection piece 784 and the grounding piece 785 is changed, the real-time monitoring of the liquid level in the liquid suction pipe 71 can be effectively realized, and the liquid level height in the liquid suction pipe 71 can be further effectively judged.

Optionally, a spring 751 is disposed on the sliding block 75, and one end of the supporting bracket 78 may be connected to the spring 751. When the sliding block 75 drives the magnet 79 to move away from the reed pipe 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 spring 751, and is limited under the action of the limiting block 76, so that the sliding block 75 is prevented from moving on the connecting pipe beyond a preset stroke.

Optionally, the sliding block 75 is provided with an avoidance groove 752 for accommodating the reed pipe 782. Alternatively, the bypass groove 752 is provided along the axial direction of the connection pipe. This structure, dodge the tongue tube 782 through setting up and dodging groove 752 can dodge, can effectively realize the removal of sliding block 75 on the connecting pipe, and the magnet piece 79 of being convenient for is close to or keeps away from tongue tube 782, also plays certain spacing guide effect simultaneously.

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

Further, referring to fig. 4, as a specific implementation manner of the pipetting assembly provided by the embodiment of 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 contains liquid, and the pressure sensor 783 is electrically connected to the control main board 781. This structure, when carrying out the imbibition operation, form the negative pressure intensity between piston rod 73 bottom and the liquid level in the pipette 71, if the sampling head 10 takes place to block up, then this negative pressure intensity can rise rapidly, and pressure sensor 783 senses this rising negative pressure intensity, and affirmation sampling head 10 damages to remind the staff in time to change. On the contrary, similarly, when the liquid discharging 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 is rapidly increased, the pressure sensor 783 senses the increased positive pressure, the sampling head 10 is determined to be damaged, and the worker is reminded to replace the sampling head in time. Therefore, the pressure sensor 783 can detect the pressure between the piston rod 73 and the liquid level in the pipette 71, so that whether the sampling head 10 is damaged or blocked can be detected, the testing sensitivity is high, and convenience and rapidness are realized.

Further, please refer to fig. 1 and fig. 2 together, as a specific implementation manner of the liquid-transferring assembly provided by the embodiment of the present invention, the liquid-transferring assembly further includes a lateral moving mechanism 8 for driving the liquid-transferring arm 7 to move along an axis direction parallel to the rotating shaft 5, the lateral moving mechanism 8 includes a driving wheel 81 and a driven wheel 82 respectively 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 to drive the supporting block 3 to move; connecting block 84 is slidably mounted on base 1, one end of connecting block 84 is connected with conveyor belt 83, the other end is connected with supporting block 3, transmission device 85 is connected with driving wheel 81, and transmission device 85 is mounted on base 1. With the structure, when the transmission 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 liquid transfer arm 7 on the horizontal plane along the Y-axis direction 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 connecting block 84 can move directionally, and the moving accuracy of the connecting block 84 is improved. Optionally, the driving wheel 81 and the driven wheel 82 are both provided with latches to improve the connection reliability with the transmission belt 83, effectively prevent the transmission belt 83 from slipping, and improve the transmission efficiency between the driving wheel 81 and the driven wheel 82, which is not limited herein.

Further, please refer to fig. 1 and fig. 7 together, as a specific implementation manner of the liquid-transfering assembly provided by the embodiment of the present invention, the liquid-transfering 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 support 11 for supporting the longitudinal moving mechanism 9, the longitudinal moving mechanism 9 includes two rotating wheels 91 rotatably mounted on the support 11 respectively, a conveying belt 92 for connecting the two rotating wheels 91, a guide block 94 for connecting the base 1 with 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 bracket 11, one end of the guide block 94 is connected with the conveying belt 92, the other end of the guide block 94 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 bracket 11. With this structure, when the output device 93 drives the rotating wheel 91 and the conveying belt 92 to rotate, the guide block 94 is also driven to slide on the bracket 11, and the base 1 connected with the guide block 94 moves on a horizontal plane along the X-axis direction, 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 matching among the driving device 6, the rotating shaft 5, the gear 4 and the rack 2, the pipetting arm 7 can be driven to move along the Y-axis direction through the transverse moving mechanism 8, the pipetting arm 7 can be driven to move along the X-axis direction through the longitudinal moving mechanism 9, and then the pipetting arm 7 can be moved along 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 engaged with the first guide rail 111 and a second guide groove 942 engaged with the second guide rail 112. The accuracy of movement of the guide block 94 on the bracket 11 can be improved 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. Optionally, the two rotating wheels 91 are provided with latches to improve the connection reliability with the conveying belt 92, effectively prevent the conveying belt 92 from slipping, and improve the transmission efficiency between the two rotating wheels 91, which is not limited herein.

Optionally, the pipetting assembly further comprises a positioning slot 113 opened in the support 11 and a crawler 14 having one end mounted in the positioning slot 113 and the other end connected to the base 1. The positioning groove 113 can play a certain positioning role in the crawler 14, and the precision and reliability of the movement of the pipetting arm 7 along the X-axis direction are further improved through the matching of the crawler 14 and the positioning groove 113.

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

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A pipetting assembly characterized by: the device comprises a base, a liquid transfer arm for taking and placing liquid, a rack arranged on the liquid transfer 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 installed on the supporting block, the gear is slidably sleeved on the rotating shaft, the rack is slidably installed on the supporting block, and the driving device is installed on the base and connected with the rotating shaft.

2. A pipetting assembly as recited in claim 1 wherein: the liquid transfer arm comprises a liquid storage pipe for supporting the sampling head, a piston rod arranged in the liquid storage pipe in a sliding mode 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 pipe is slidably arranged on the rack.

3. A pipetting assembly as recited in claim 2 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 used for driving the sliding block to move and a power mechanism used for driving the screw rod to rotate; the sliding block is installed on the screw rod, one end of the screw rod is connected with the power mechanism, the other end of the screw rod extends into the piston rod, and the power mechanism is installed on the rack.

4. A pipetting assembly as recited in claim 3 wherein: the pipetting arm also comprises a plunger ring for sealing the joint of the piston rod and the slide block.

5. A pipetting assembly as recited in claim 3 wherein: the power mechanism comprises a first rotating gear, a second rotating gear, a power device and a shell, wherein the first rotating gear is sleeved and fixed on the screw rod, the second rotating gear is meshed with the first rotating gear, the power device is used for driving the second rotating gear to rotate, and the shell is used for supporting the power device; the power device is connected with the second rotating gear, and the machine shell is arranged on the rack.

6. A pipetting assembly as recited in claim 2 wherein: move liquid arm still including be used for with during the supporting shoe butt fade the sliding block of the sampling head on the liquid reserve pipe with be used for the restriction the sliding block is in the stopper that moves on the liquid reserve pipe, the sliding block cover is located on the liquid reserve pipe and with sampling head looks butt on the liquid reserve pipe, the stopper is installed in the rack and is close to the one end of sliding block.

7. A pipetting assembly as recited in claim 6 wherein: the liquid storage pipe comprises a liquid suction pipe for supporting a sampling head and a hollow pipe communicated with the liquid suction pipe, and the piston rod is slidably arranged in the hollow pipe; the liquid transfer arm further comprises a connecting pipe for communicating the liquid suction pipe 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 reed pipe to be switched on or off and two pole pieces connected with and supporting the reed pipe, the connecting pipe is sleeved with the sliding block, the magnet block is mounted on the sliding block, and the two pole pieces are respectively connected with the control main board.

8. A pipetting assembly as recited in claim 7 wherein: the liquid transfer arm further comprises a pressure sensor which is used for measuring the pressure between the end part of the piston rod and the liquid level in the liquid transfer tube when the liquid transfer tube is filled with liquid, and the pressure sensor is connected with the control main board.

9. Pipetting assembly according to any one of claims 1-8, wherein: the liquid transfer assembly further comprises a transverse moving mechanism for driving the liquid transfer arm to move along the axis direction parallel to the rotating shaft, and the transverse moving mechanism comprises a driving wheel and a driven wheel which are respectively rotatably mounted 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.

10. A pipetting assembly as recited in claim 9 wherein: the liquid transfer assembly further comprises a longitudinal moving mechanism and a support, the longitudinal moving mechanism is used for driving the liquid transfer arm to move along the direction perpendicular to the axis of the rotating shaft, the support supports the longitudinal moving mechanism, the longitudinal moving mechanism comprises two rotating wheels, a conveying belt, a guide block and an output device, the two rotating wheels are respectively rotatably mounted on the support, the conveying belt is connected with the two rotating wheels, the guide block is used for connecting the base with the conveying belt, and the output device is used 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.