CN116106571A

CN116106571A - Sample adding arm and sample adding device

Info

Publication number: CN116106571A
Application number: CN202211347460.2A
Authority: CN
Inventors: 许威南; 胡志丹
Original assignee: Zhongyuan Huiji Biotechnology Co Ltd
Current assignee: Zhongyuan Huiji Biotechnology Co Ltd
Priority date: 2022-10-31
Filing date: 2022-10-31
Publication date: 2023-05-12

Abstract

The invention discloses a sample adding arm and a sample adding device, wherein the sample adding arm is used for driving a liquid shifter to move so as to carry out liquid sucking and discharging work, and comprises: an X-axis supporting plate; the two synchronous belt transmission assemblies are arranged on the X-axis supporting plate; the two Z-axis supporting plates are assembled on the X-axis supporting plates in a sliding manner and are correspondingly connected with the two synchronous belt transmission assemblies one by one; the two screw rod transmission assemblies are respectively arranged on the two Z-axis supporting plates; the two pipettes are respectively assembled on the two screw rod transmission assemblies, and the two pipettes are eccentrically assembled towards opposite directions. According to the invention, the two pipettors are driven to move in the X-axis and Z-axis directions by the two synchronous belt transmission assemblies and the two screw rod transmission assemblies, and the distance between the two pipettors can be reduced after the two pipettors are eccentrically assembled towards opposite directions, so that the condition that two samples are extracted on a deep pore plate with small distance is met, and the sample extraction efficiency of the deep pore plate with small distance is improved.

Description

Sample adding arm and sample adding device

Technical Field

The invention relates to the technical field of medical appliances, in particular to a sample adding arm and a sample adding device.

Background

At present, a full-automatic sample processing system is adopted for sample detection in a plurality of medical inspection institutions, and a sample adding arm flexibly moves in an X axis, a Y axis and a Z axis according to the needs so as to drive a pipettor to flexibly move; when a sample adding arm drives a pipette to extract samples, for example, the sample extracting is carried out from sample tubes with the spacing of 9mm of a 96-deep hole plate, the sample tubes on the deep hole plate are compact because the hole spacing of the deep hole plate is smaller, the pipette itself has a certain volume, and usually only a single pipette can be controlled to extract samples one by one according to the sequence of the sample tubes, so that the continuous sample tubes are difficult to extract samples simultaneously through a plurality of pipettes at one time; resulting in a low sample extraction efficiency.

Disclosure of Invention

The invention aims to provide a sample adding arm and a sample adding device, and aims to solve the problem that in the prior art, when a sample adding arm drives a liquid transfer device to extract samples on a deep pore plate with smaller hole pitch, the small hole pitch can only control a single liquid transfer device to extract the samples one by one in sequence, so that the working efficiency of sample extraction is low.

In order to solve the technical problems, the aim of the invention is realized by the following technical scheme: the utility model provides a sample application arm for drive the pipettor and remove in order to carry out imbibition and flowing back work, the sample application arm includes:

an X-axis supporting plate;

the two synchronous belt transmission assemblies are arranged on the X-axis supporting plate;

the two Z-axis supporting plates are assembled on the X-axis supporting plates in a sliding manner and are correspondingly connected with the two synchronous belt transmission assemblies one by one, and the synchronous belt transmission assemblies are used for driving the Z-axis supporting plates to move on the X-axis supporting plates along the X-axis direction;

the two screw rod transmission assemblies are respectively arranged on the two Z-axis supporting plates;

the two pipettors are respectively assembled on the two screw rod transmission assemblies, the two pipettors are eccentrically assembled towards opposite directions, and the screw rod transmission assemblies are used for driving the two pipettors to move along the Z-axis direction.

Further, an X-axis guide rail is arranged on the X-axis support plate, two sliding blocks capable of moving along the X direction are slidably arranged on the X-axis guide rail, and the backs of the two Z-axis support plates are respectively arranged on the two sliding blocks.

Further, two synchronous belt drive assemblies are arranged side by side from top to bottom, each synchronous belt drive assembly includes: the X-axis motor, the driving wheel, the driven wheel set and the synchronous belt; the X-axis motor is arranged at one end of the X-axis supporting plate; the driving wheel is arranged on an output shaft of the X-axis motor; the driven wheel group is arranged at the other end of the X-axis supporting plate; the synchronous belt is sleeved on the driving wheel and the driven wheel group; the Z-axis supporting plate is connected to the corresponding synchronous belt.

Further, a connecting block is arranged on the Z-axis supporting plate, and the connecting block and the arranged pressing plate are clamped on the synchronous belt; an X-axis optical coupler detection sheet is arranged on the connecting block, an X-axis detection optical coupler is arranged on the X-axis supporting plate, and the X-axis optical coupler detection sheet is matched with the X-axis detection optical coupler to realize the movement in-place detection of the pipettor along the X-axis.

Further, the driven wheel group includes: the pulley plate, the adjusting block, the adjusting screw, the wheel shaft and the driven wheel; the pulley plate is arranged at the other end of the X-axis supporting plate; the adjusting block is arranged on the pulley plate and can move on the pulley plate; the adjusting screw is in threaded connection with the pulley plate and is in rotary connection with the adjusting block; the wheel axle is arranged on the adjusting block; the driven wheel is arranged on the wheel shaft.

Further, a mounting plate is mounted on the Z-axis supporting plate, and a Z-axis guide rail is mounted on the mounting plate; the screw rod transmission assembly comprises a Z-axis motor, a screw rod and a moving block; the Z-axis motor is installed on the installation plate, one end of the screw rod is connected with an output shaft of the Z-axis motor, the moving block is in threaded connection with the screw rod and is in sliding assembly with the Z-axis guide rail, and the pipettor is assembled with the moving block.

Further, the screw rod transmission assembly further comprises a bearing piece arranged on the mounting plate, and one end, far away from the Z-axis motor, of the screw rod is inserted into the bearing piece to enhance transmission stability.

Further, an adapter plate is arranged on the moving block, and the pipettor is eccentrically assembled on the adapter plate; install the locating plate on the keysets, install Z axle opto-coupler detection piece on the locating plate, install Z axle detection opto-coupler in the Z axle backup pad, through Z axle opto-coupler detection piece with Z axle detection opto-coupler cooperation is in order to realize the motion of pipettor along the Z axle detects in place.

Further, the lower extreme of mounting panel is equipped with rotatory tray subassembly, rotatory tray subassembly includes:

the driving motor is arranged at the lower end of the mounting plate;

the tray is arranged on the output shaft of the driving motor, is positioned below the liquid transfer device and is used for preventing the liquid transfer device from dripping in the liquid transfer process.

The embodiment of the invention also provides a sample adding device, wherein: the automatic liquid sucking and discharging device comprises a sample adding arm and the liquid sucking device, wherein the liquid sucking device is assembled on the sample adding arm, and the sample adding arm is used for driving the liquid sucking device to move and suck liquid and discharge liquid.

The embodiment of the invention provides a sample adding arm and a sample adding device, wherein the sample adding arm is used for driving a liquid shifter to move so as to carry out liquid sucking and discharging work, and comprises: an X-axis supporting plate; the two synchronous belt transmission assemblies are arranged on the X-axis supporting plate; the two Z-axis supporting plates are assembled on the X-axis supporting plates in a sliding manner and are correspondingly connected with the two synchronous belt transmission assemblies one by one; the two screw rod transmission assemblies are respectively arranged on the two Z-axis supporting plates; the two pipettes are respectively assembled on the two screw rod transmission assemblies, and the two pipettes are eccentrically assembled towards opposite directions. According to the invention, the two pipettors are driven to move in the X-axis and Z-axis directions by the two synchronous belt transmission assemblies and the two screw rod transmission assemblies, and the distance between the two pipettors can be reduced after the two pipettors are eccentrically assembled towards opposite directions, so that the condition that two samples are extracted on a deep pore plate with small distance is met, and the sample extraction efficiency of the deep pore plate with small distance is improved.

Drawings

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

FIG. 1 is a schematic structural view of a sample loading arm according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the front structure of a Z-axis portion of a sample loading arm according to an embodiment of the present invention;

FIG. 3 is a schematic view of the rear structure of the Z-axis portion of the sample loading arm according to an embodiment of the present invention;

fig. 4 is a schematic view of a view angle structure of a driven wheel set according to an embodiment of the present invention;

fig. 5 is a schematic view of another view angle structure of a driven wheel set according to an embodiment of the present invention;

fig. 6 is a schematic view of a part of a structure of a driven wheel set according to an embodiment of the present invention.

The figure identifies the description:

11. a left side support plate; 12. an intermediate support plate; 13. a right side support plate; 14. an X-axis guide rail; 15. an X-axis detection optocoupler;

2. a synchronous belt drive assembly; 21. an X-axis motor; 22. a driving wheel; 23. a driven wheel group; 231. a pulley plate; 232. an adjusting block; 233. an adjusting screw; 234. a wheel axle; 235. driven wheel; 236. a rolling bearing sleeve; 237. a compression screw; 24. a synchronous belt;

3. a screw rod transmission assembly; 31. a Z-axis motor; 311. a Z-axis motor mounting plate; 32. a screw rod; 33. a moving block; 34. a bearing member; 35. an adapter plate; 36. a positioning plate; 37. z-axis optocoupler detection pieces;

4. a Z-axis support plate; 41. a connecting block; 411. x-axis optocoupler detection pieces; 42. a Z-axis detection optocoupler; 43. the tray detects the optocoupler;

5. a mounting plate; 51. a Z-axis guide rail;

6. a rotating tray assembly; 61. a driving motor; 611. a stepper motor mounting plate; 62. a tray; 63. a tray detection sheet;

7. a pipette.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

Referring to fig. 1-3, an embodiment of the present invention provides a sample loading arm for driving a pipette 7 to move to perform pipetting and draining operations, the sample loading arm including:

an X-axis supporting plate;

the two synchronous belt transmission assemblies 2 are arranged on the X-axis supporting plate side by side up and down;

the two Z-axis support plates 4 are assembled on the X-axis support plates in a sliding manner and are connected with the two synchronous belt transmission assemblies 2 in a one-to-one correspondence manner, and the synchronous belt transmission assemblies 2 are used for driving the Z-axis support plates 4 to move on the X-axis support plates along the X-axis direction;

the two screw rod transmission assemblies 3 are respectively arranged on the two Z-axis support plates 4;

the two pipettes 7 are respectively assembled on the two screw transmission assemblies 3, the two pipettes 7 are eccentrically assembled towards opposite directions, and the screw transmission assemblies 3 are used for driving the two pipettes 7 to move along the Z-axis direction.

In the embodiment, two synchronous belt transmission assemblies 2 respectively drive two Z-axis support plates 4 to move on the X-axis support plates along the X-axis direction, namely drive a liquid transfer device 7 to move along the X-axis direction; the two pipettors 7 are driven to move along the Z-axis direction by the two screw rod transmission assemblies 3, so that the two pipettors 7 can simultaneously perform sample extraction work, and the sample extraction efficiency is improved.

And when the sample is extracted from the deep hole plate with smaller hole pitch, the two pipettes 7 of the embodiment can be eccentrically assembled on the lead screw transmission assembly 3 where the two pipettes are respectively located towards opposite directions, namely, the two pipettes 7 can be infinitely close in the X-axis direction and other parts are not interfered, namely, the distance between the sample sucking positions at the bottoms of the two pipettes 7 is reduced, namely, the two samples can be extracted from the deep hole plate with smaller hole pitch at a time, so that the sample extraction efficiency is improved.

In one embodiment, the X-axis guide rail 14 is provided on the X-axis support plate, and two sliding blocks capable of moving along the X-direction are slidably mounted on the X-axis guide rail 14, and the backs of the two Z-axis support plates 4 are respectively mounted on the two sliding blocks.

In some implementations, as shown in fig. 1, the X-axis support plate may include a left side support plate 11, an intermediate support plate 12, and a right side support plate 13, the left side support plate 11 and the right side support plate 13 being mounted at both ends of the intermediate support plate 12; the X-axis guide rail 14 may be mounted on the intermediate support plate 12 by screws; the back of the Z-axis support plate 4 can be provided with a mounting notch, and the Z-axis support plate 4 can be positioned with the sliding block and fixed by a screw, so that the Z-axis support plate 4 can stably move on the X-axis guide rail 14 along the X-direction, and the pipette 7 can stably move along the X-direction.

In one embodiment, each timing belt drive assembly 2 comprises: an X-axis motor 21, a driving wheel 22, a driven wheel group 23 and a synchronous belt 24; the X-axis motor 21 is mounted on one end of the X-axis support plate (i.e., on the right support plate 13); the driving wheel 22 is arranged on the output shaft of the X-axis motor 21; the driven wheel group 23 is arranged at the other end of the X-axis supporting plate (namely, on the left supporting plate 11); the synchronous belt 24 is sleeved on the driving wheel 22 and the driven wheel group 23; the Z-axis support plates 4 are connected to corresponding timing belts 24.

In this embodiment, the right support plate 13 may be used as a motor mounting plate of the X-axis motor 21, and the driven wheel set 23 may be mounted on the left support plate 11, so that the synchronous belt 24 sleeved on the driving wheel 22 and the driven wheel set 23 may be driven along the X-axis direction to drive the Z-axis support plate 4 to move along the X-axis direction. Specifically, the upper end of the Z-axis support plate 4 is connected with a corresponding synchronous belt 24; the driving wheel 22 is driven to rotate by the X-axis motor 21, the driving wheel 22 drives the driven wheel 235 of the driven wheel group 23 to synchronously rotate by the synchronous belt 24, and the synchronous belt 24 is driven along the X-axis direction, so that the Z-axis supporting plate 4 is driven to move along the X-axis direction on the X-axis guide rail 14, namely the pipettor 7 is driven to move along the X-axis direction.

In some implementations, in order to ensure that the synchronous belt 24 can stably drive the Z-axis support plate 4 to move along the X-axis direction, a connecting block 41 is fixedly installed on the Z-axis support plate 4, a pressing plate is detachably installed on the connecting block 41, the synchronous belt 24 can be clamped through the connecting block 41 and the pressing plate, and then the pressing plate is fixed with the connecting block 41, so that the synchronous belt 24 is clamped, thereby ensuring that the synchronous belt 24 can stably drive the Z-axis support plate 4 to move along the X-axis direction, that is, ensuring that the stably driven pipettor 7 can move in the X-axis direction.

In some implementations, in order to ensure that the movement of the pipette 7 along the X axis can be accurately in place, an X-axis optocoupler detection sheet 411 is installed on the connection block 41, a corresponding X-axis detection optocoupler 15 is installed on the right support plate 13 of the X-axis support plate, and the movement of the pipette 7 along the X axis is detected in place by the cooperation of the X-axis optocoupler detection sheet 411 and the X-axis detection optocoupler 15; it can be understood that when the two Z-axis support plates 4 drive the two pipettes 7 to move in the X-axis direction, when the two X-axis optocoupler detection pieces 411 on the two connection blocks 41 trigger the corresponding two X-axis optocouplers 15 on the right support plate 13 respectively, the two pipettes 7 move in place at this time, and the distance between the liquid suction openings of the two pipettes 7 satisfies the extraction of two adjacent samples on the deep hole plate with small hole pitch at this time, that is, the two pipettes 7 are controlled to perform synchronous movement at this time, so that two adjacent samples can be extracted at a time, thereby improving the sample extraction efficiency.

As shown in connection with fig. 4-6, in one embodiment, the driven wheelset 23 includes: pulley plate 231, adjustment block 232, adjustment screw 233, axle 234, and driven wheel 235; the pulley plate 231 is mounted at the other end of the X-axis support plate; the adjusting block 232 is mounted on the pulley plate 231 and is movable on the pulley plate 231; the adjusting screw 233 is in threaded connection with the pulley plate 231 and is in rotational connection with the adjusting block 232; axle 234 is mounted to adjustment block 232; a driven wheel 235 is mounted to the axle 234.

In some implementations, the pulley plate 231 may be mounted on the left supporting plate 11 and used as a support for the whole driven pulley group 23, the adjusting block 232 is mounted on the pulley plate 231 through a waist hole provided with a matched screw, the adjusting block 232 may be movably adjusted on the pulley plate 231 along the length direction (i.e. the X-axis direction) of the waist hole, the wheel shaft 234 is mounted on the adjusting block 232 and penetrates through the pulley plate 231, an opening space for the wheel shaft 234 to move along with the adjusting block 232 is formed on the pulley plate 231, the driven pulley 235 may be pre-mounted on a rolling bearing sleeve 236, the rolling bearing sleeve 236 is sleeved on the wheel shaft 234 through the rolling bearing sleeve 236, and the rolling bearing sleeve 236 is pressed through the pressing screw 237, so that the driven pulley 235 may stably roll on the wheel shaft 234.

It can be appreciated that the adjusting screw 233 can be rotated to drive the adjusting block 232 to move and adjust on the pulley plate 231 along the length direction (i.e. the X-axis direction) of the waist hole, so as to tension and adjust the synchronous belt 24.

Referring to fig. 2 and 3, in one embodiment, a mounting plate 5 is mounted on the Z-axis support plate 4, and a Z-axis guide rail 51 is mounted on the mounting plate 5; the screw transmission assembly 3 comprises a Z-axis motor 31, a screw 32 and a moving block 33; the Z-axis motor 31 is installed on the mounting plate 5, one end of the screw rod 32 is connected with an output shaft of the Z-axis motor 31, the moving block 33 is connected to the screw rod 32 in a threaded mode, the moving block 33 is assembled on the Z-axis guide rail 51 in a sliding mode, and the pipettor 7 is assembled on the moving block 33.

In some implementations, the mounting plate 5 may be vertically fixedly mounted on the Z-axis support plate 4 by screws; the Z-axis guide rail 51 can be vertically and fixedly arranged on the mounting plate 5 through a screw, the Z-axis motor 31 can be arranged at the upper end of the mounting plate 5 through a Z-axis motor mounting plate 311, the upper end of the screw rod 32 is coaxially connected with the output shaft of the Z-axis motor 31, a threaded hole is formed in the moving block 33, the moving block 33 is sleeved on the screw rod 32 through the threaded hole in a threaded manner, and meanwhile, the back of the moving block 33 is slidably assembled on the Z-axis guide rail 51; after the pipette 7 is assembled on the moving block 33, the screw rod 32 is driven to rotate by the Z-axis motor 31, so that the moving block 33 can be driven to move on the Z-axis guide rail 51 along the Z-axis direction, and the pipette 7 is driven to move along the Z-axis direction.

In order to improve the stability of the transmission of the screw rod 32, the screw rod transmission assembly 3 further comprises a bearing piece 34 arranged at the lower end of the mounting plate 5, the bearing piece 34 comprises a bearing seat and a deep groove ball bearing arranged in the bearing seat, the lower end of the screw rod 32 is inserted into an inner ring of the deep groove ball bearing, the transmission stability of the screw rod 32 can be enhanced, and the deflection deformation of the screw rod 32 is reduced.

In one embodiment, the adapter plate 35 is mounted on the moving block 33, and the pipettor 7 is eccentrically mounted on the adapter plate 35; the adapter plate 35 is provided with a positioning plate 36, the positioning plate 36 is provided with a Z-axis optocoupler detection sheet 37, the Z-axis support plate 4 is provided with a Z-axis detection optocoupler 42, and the Z-axis optocoupler detection sheet 37 and the Z-axis detection optocoupler 42 are matched to realize the movement in-place detection of the pipettor 7 along the Z axis.

In this embodiment, the adapter plate 35 may be mounted on the front side of the moving block 33, and when the screw rod 32 drives the moving block 33 to move up and down along the Z axis, the adapter plate 35 and the pipette 7 may be driven to move up and down; in addition, the pipettes 7 are eccentrically assembled on the adapter plate 35, the pipettes 7 after eccentric installation are offset to one side, and the opposite offset of the other pipettes 7 is matched, so that the distance between the liquid suction openings of the two pipettes 7 is reduced, the small distance requirement of the two pipettes 7 is realized, and further, the efficient extraction of samples of deep pore plates with small distance and hole distances is realized.

The adapter plate 35 is provided with a positioning plate 36, the positioning plate 36 can be a bending plate, one end of the positioning plate 36 is arranged on the adapter plate 35, the other end of the positioning plate 36 is positioned at the rear side of the Z-axis supporting plate 4, and the Z-axis optocoupler detection piece 37 is arranged at the other end of the positioning plate 36; the Z-axis detecting optocoupler 42 is mounted on the rear side of the Z-axis supporting plate 4, when the pipettor 7 absorbs liquid and moves upwards, the adapter plate 35 moves upwards and drives the positioning plate 36 and the Z-axis optocoupler detecting sheet 37 to move upwards, and the Z-axis optocoupler detecting sheet 37 moves upwards and triggers the Z-axis detecting optocoupler 42 to feed back the pipettor 7 to move upwards in place.

Referring to fig. 2 and 3, in one embodiment, a rotary tray assembly 6 is provided at a lower end of the mounting plate 5, the rotary tray assembly 6 includes a driving motor 61 and a tray 62, and the driving motor 61 is mounted at the lower end of the mounting plate 5; the tray 62 is mounted on the output shaft of the drive motor 61, and the tray 62 is located below the pipettor 7.

In this embodiment, the rotary tray assembly 6 is used to prevent the pipettor 7 after pipetting from dripping during pipetting; it will be appreciated that when the pipette 7 is pipetting, the drive motor 61 drives the tray 62 to rotate away from the bottom of the pipette 7, avoiding affecting pipetting of the pipette 7, and after pipetting of the pipette 7 is completed and moved up into place, the drive motor 61 drives the tray 62 to rotate to the bottom of the pipette 7 to prevent dripping.

In some implementations, the drive motor 61 may be a stepper motor mounted to the bottom of the mounting plate 5 below the bearing member 34 by a stepper motor mounting plate 611; one side of the tray 62 is provided with a tray detection piece 63, the back of the mounting plate 5 is provided with a tray detection optocoupler 43, when the pipettor 7 is in imbibition, the driving motor 61 drives the tray 62 to rotate and drives the tray detection piece 63 to rotate, and the tray detection piece 63 rotates to trigger the tray detection optocoupler 43 to rotate in place in a feedback manner.

In some of the above assembly modes, the mounting plate 5 may be used as a substrate, and components directly and indirectly mounted on the mounting plate 5 may be integrated into a pipetting module along with the mounting plate 5 and then mounted on the Z-axis support plate 4.

The embodiment of the invention also provides a sample adding device, wherein: the device comprises a sample adding arm and the liquid removing device 7, wherein the liquid removing device 7 is assembled on the sample adding arm, and the sample adding arm is used for driving the liquid removing device 7 to move and conduct liquid suction and liquid discharge.

While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims

1. A sample addition arm for drive the pipettor remove in order to carry out imbibition and flowing back work, its characterized in that, the sample addition arm includes:

an X-axis supporting plate;

2. The loading arm of claim 1, wherein:

the X-axis support plate is provided with an X-axis guide rail, two sliding blocks capable of moving along the X direction are slidably arranged on the X-axis guide rail, and the back parts of the two Z-axis support plates are respectively arranged on the two sliding blocks.

3. The loading arm of claim 1, wherein two of said timing belt drive assemblies are disposed side-by-side one above the other, each of said timing belt drive assemblies comprising:

the X-axis motor is arranged at one end of the X-axis supporting plate;

the driving wheel is arranged on the output shaft of the X-axis motor;

the driven wheel group is arranged at the other end of the X-axis supporting plate;

the synchronous belt is sleeved on the driving wheel and the driven wheel group;

the Z-axis supporting plate is connected to the corresponding synchronous belt.

4. A loading arm according to claim 3, wherein:

a connecting block is arranged on the Z-axis supporting plate, and the connecting block and the arranged pressing plate are clamped on the synchronous belt;

an X-axis optical coupler detection sheet is arranged on the connecting block, an X-axis detection optical coupler is arranged on the X-axis supporting plate, and the X-axis optical coupler detection sheet is matched with the X-axis detection optical coupler to realize the movement in-place detection of the pipettor along the X-axis.

5. The loading arm of claim 3, wherein the driven wheel set comprises:

the pulley plate is arranged at the other end of the X-axis supporting plate;

the adjusting block is arranged on the pulley plate and can move on the pulley plate;

the adjusting screw is in threaded connection with the pulley plate and is in rotary connection with the adjusting block;

the wheel shaft is arranged on the adjusting block;

and the driven wheel is arranged on the wheel shaft.

6. The loading arm of claim 1, wherein:

the Z-axis supporting plate is provided with a mounting plate, and the mounting plate is provided with a Z-axis guide rail;

the screw rod transmission assembly comprises a Z-axis motor, a screw rod and a moving block; the Z-axis motor is installed on the installation plate, one end of the screw rod is connected with an output shaft of the Z-axis motor, the moving block is in threaded connection with the screw rod and is in sliding assembly with the Z-axis guide rail, and the pipettor is assembled with the moving block.

7. The loading arm of claim 6, wherein:

the screw rod transmission assembly further comprises a bearing piece arranged on the mounting plate, and one end, far away from the Z-axis motor, of the screw rod is inserted into the bearing piece to enhance transmission stability.

8. The loading arm of claim 6, wherein:

an adapter plate is arranged on the moving block, and the pipettor is eccentrically assembled on the adapter plate;

install the locating plate on the keysets, install Z axle opto-coupler detection piece on the locating plate, install Z axle detection opto-coupler in the Z axle backup pad, through Z axle opto-coupler detection piece with Z axle detection opto-coupler cooperation is in order to realize the motion of pipettor along the Z axle detects in place.

9. The loading arm of claim 1, wherein the lower end of the mounting plate is provided with a rotating tray assembly comprising:

the driving motor is arranged at the lower end of the mounting plate;

10. A sample application device, characterized in that: comprising a sample addition arm and a pipette according to any one of claims 1 to 9, wherein the pipette is mounted on the sample addition arm, and the sample addition arm is used for driving the pipette to move and perform pipetting and drainage.