CN219518901U - Pitch changing assembly and pipetting device - Google Patents

Abstract

The utility model discloses a distance changing assembly and liquid transferring equipment, and relates to the technical field of liquid transferring devices, wherein the distance changing assembly comprises a sliding seat, a plurality of X-direction distance changing plates, two Y-direction distance changing plates, a plug assembly, an X-direction driving assembly and a Y-direction driving assembly, the two X-direction adjusting plates are positioned on two sides of the plurality of X-direction distance changing plates, a first bearing of the X-direction distance changing plates is in sliding fit with an X-direction sliding groove of the X-direction adjusting plates, the X-direction driving assembly drives the two X-direction adjusting plates to synchronously slide up and down so as to realize that the plurality of X-direction distance changing plates are mutually close to or mutually far away along an X-axis direction, the two Y-direction adjusting plates are positioned on two sides of the two Y-direction distance changing plates, a second bearing of the Y-direction distance changing plates is in sliding fit with a Y-direction sliding groove of the Y-direction adjusting plates, and the Y-direction driving assembly drives the two Y-direction adjusting plates to synchronously slide up and down so as to realize that the two Y-direction distance changing plates are mutually close to or mutually far away along the Y-axis direction, and the sliding plug is pushed to move along the sliding groove. The variable-pitch assembly synchronously drives and improves the variable-pitch effect.

Description

Pitch changing assembly and pipetting device

Technical Field

The utility model relates to the technical field of pipettors, in particular to a variable-pitch assembly and pipetting equipment using the variable-pitch assembly.

Background

The pipettor is an essential experimental instrument for all biochemical laboratories to perform immunization, cell culture, clinical diagnosis and food analysis, and can transfer biochemical reagents into specific experimental vessels, such as 24-well plates, 48-well plates, 96-well plates, 384-well plates, etc.

Because sampling plates have various specifications and the hole pitches of different sampling plates are different, the multichannel pipettor with fixed pitches can only be suitable for sampling plates with the same specification, in order to solve the problem, in the utility model proposed by the applicant in 2022, 4 months and 14 days, the pitch of the left-right direction and the front-back direction is realized through the pitch-changing screw rod and the pitch-changing cam.

Disclosure of Invention

The utility model mainly aims to provide a variable-pitch assembly, and aims to provide a variable-pitch assembly which is synchronously driven and improves the variable-pitch effect.

In order to achieve the above object, the present utility model provides a distance-varying assembly for adapting to sampling plates of different specifications, the distance-varying assembly comprising:

the sliding seat is provided with an X-direction sliding rail and a Y-direction sliding rail;

the X-direction distance changing plate is provided with a plurality of first sliding grooves which are spaced in the Y-axis direction and are in sliding fit with the X-direction sliding rails, a mounting groove is formed between the two first sliding grooves, and first bearings are arranged at two ends of the X-direction distance changing plate;

the two Y-direction distance changing plates penetrate through the plurality of X-direction distance changing plates and are in sliding fit with the Y-direction sliding rails, the Y-direction distance changing plates are provided with second sliding grooves along the X-axis direction, and two ends of each Y-direction distance changing plate are provided with second bearings;

the plug-in nozzle assembly is provided with a plurality of groups of X-direction distance changing plates corresponding to the X-direction distance changing plates, each plug-in nozzle assembly is provided with three plug-in nozzles, namely a fixed plug-in nozzle and two sliding plug-in nozzles, the fixed plug-in nozzles are arranged in the mounting grooves, and the two sliding plug-in nozzles penetrate through the second sliding grooves and are respectively and slidably arranged in the two first sliding grooves;

the X-direction driving assembly is arranged on the sliding seat and comprises an X-direction driving device and two X-direction adjusting plates, the X-direction adjusting plates are provided with a plurality of X-direction sliding grooves which are distributed radially, a plurality of X-direction distance changing plates are positioned between the two X-direction adjusting plates, the first bearing is in sliding fit with the X-direction sliding grooves, and the X-direction driving device drives the two X-direction adjusting plates to slide up and down synchronously;

the Y-direction driving assembly is arranged on the sliding seat and comprises a Y-direction driving device and two Y-direction adjusting plates, the Y-direction adjusting plates are provided with two symmetrical Y-direction sliding grooves which are arranged in an angle mode, the two Y-direction distance changing plates are positioned between the two Y-direction adjusting plates, the second bearing is in sliding fit with the Y-direction sliding grooves, and the Y-direction driving assembly drives the two Y-direction adjusting plates to slide up and down synchronously.

Optionally, the X-direction driving assembly further includes:

the X-direction adjusting plates are respectively matched with the two first fixing plates in an up-down sliding way;

the first connecting plate is used for connecting the two X-direction adjusting plates;

the X-direction driving device is arranged on any one of the first fixing plates and drives the X-direction adjusting plate in sliding fit with the first fixing plate.

Optionally, the Y-direction driving assembly further includes:

the two Y-direction adjusting plates are respectively matched with the two second fixing plates in an up-down sliding way;

the second connecting plate is used for connecting the two Y-direction adjusting plates;

the Y-direction driving device is arranged on any one of the second fixing plates and drives the Y-direction adjusting plate in sliding fit with the second fixing plate.

Optionally, the X-direction driving device includes:

the motor seat is arranged on any one of the first fixing plates;

the penetrating motor is provided with a screw rod capable of moving up and down, and the screw rod is connected with the X-direction adjusting plate.

Optionally, the structure of the X-direction driving device is the same as the structure of the Y-direction driving device.

Optionally, the X-direction driving assembly further includes a first photoelectric sensor and a first sensing piece, where the first photoelectric sensor is disposed on any one of the first fixing plates, and the first sensing piece is disposed on the X-direction adjusting plate in sliding fit with the first fixing plate; the Y-direction driving assembly further comprises a second photoelectric sensor and a second sensing piece, wherein the second photoelectric sensor is arranged on any one of the second fixing plates, and the second sensing piece is arranged on the Y-direction adjusting plate in sliding fit with the second fixing plate.

Optionally, sliding fit is realized through the guide rail slider between the first fixed plate and the X direction regulating plate, sliding fit is realized through the guide rail slider between the second fixed plate and the Y direction regulating plate.

Optionally, the sliding fit is realized between the X-direction variable-pitch plate and the X-direction sliding rail through a linear bearing, and the sliding fit is realized between the Y-direction variable-pitch plate and the Y-direction sliding rail through a linear bearing.

Optionally, the sliding plug is square in sliding fit with the first sliding groove and the second sliding groove.

The utility model also proposes a pipetting device comprising:

a pitch assembly as described above;

the pipetting assembly is arranged at the top of the sliding seat and is provided with a plurality of pipetting nozzles, and the pipetting nozzles are in one-to-one correspondence with the plugs and are connected through hoses.

The technical scheme of the utility model comprises a sliding seat, a plurality of X-direction distance changing plates, two Y-direction distance changing plates, a plug assembly, an X-direction driving assembly and a Y-direction driving assembly, wherein the two X-direction adjusting plates of the X-direction driving assembly are positioned at two sides of the plurality of X-direction distance changing plates, a first bearing of the X-direction distance changing plate is in sliding fit with an X-direction sliding chute of the X-direction adjusting plate, an X-direction driving device of the X-direction driving assembly drives the two X-direction adjusting plates to synchronously slide up and down so as to realize that the plurality of X-direction distance changing plates are mutually close to or far away from each other along the X-axis direction, the two Y-direction adjusting plates of the Y-direction driving assembly are positioned at two sides of the two Y-direction distance changing plates, a second bearing of the Y-direction distance changing plate is in sliding fit with the Y-direction sliding chute of the Y-direction adjusting plate, the Y-direction driving assembly drives the two Y-direction adjusting plates to synchronously slide up and down so as to realize that the two Y-direction distance changing plates are mutually close to each other or mutually far away from each other along the Y-axis direction, and the plug assembly is slidably arranged at the positions of sliding chute along with the X-direction changing plates and the X-direction adjusting plates and the Y-direction adjusting plates are synchronously moved along with the Y-direction adjusting plates.

Drawings

FIG. 1 is a schematic diagram of a variable pitch assembly according to an embodiment of the present utility model;

FIG. 2 is a schematic top view of a pitch assembly of the present utility model;

FIG. 3 is a schematic cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a schematic cross-sectional view taken along line B-B in FIG. 2;

FIG. 5 is a schematic view of the pitch changing assembly of the present utility model with the X-direction drive assembly and the Y-direction drive assembly omitted;

FIG. 6 is a schematic view of the mounting locations of the X-direction pitch plate, Y-direction pitch plate and spigot assembly of the utility model;

FIG. 7 is a schematic structural view of an X-direction driving assembly according to the present utility model;

FIG. 8 is a schematic view of the Y-direction drive assembly of the present utility model;

FIG. 9 is a schematic view showing the structure of an embodiment of a pipetting device of the utility model;

reference numerals illustrate:

a pipetting device 100; a pitch assembly 10; a slide seat 11; an X-direction pitch plate 12; a first chute 121; a first bearing 122; a Y-direction pitch-changing plate 13; a second chute 131; a second bearing 132; a fixed plug 141; a sliding plug 142; an X-direction drive assembly 15; an X-direction driving device 151; motor mount 1511; penetrating the motor 1512; an X-direction adjustment plate 152; an X-direction runner 1521; a first fixing plate 153; a first connection plate 154; a first photosensor 155; a first inductive pad 156; a Y-direction drive assembly 16; a Y-direction driving device 161; a Y-direction adjustment plate 162; y-direction chute 1621; a second fixing plate 163; a second connection plate 164; a second photosensor 165; a second inductive tab 166; a pipetting assembly 20; a pipette tip 21; a hose 30.

Detailed Description

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

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

In the present utility model, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The utility model provides a distance-changing assembly 10, which is used for adapting to sampling plates with different specifications, in particular to adapting to sampling plates with different hole pitches by adjusting the gap between adjacent plugs.

In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.

In the embodiment of the present utility model, as shown in fig. 1, 2, 3, 4, 5 and 6, the pitch varying assembly 10 includes a sliding seat 11, a plurality of X-direction pitch varying plates 12, two Y-direction pitch varying plates 13, a plug assembly, an X-direction driving assembly 15 and a Y-direction driving assembly 16, wherein the sliding seat 11 is provided with an X-direction sliding rail and a Y-direction sliding rail; the X-direction variable-pitch plate 12 is provided with a plurality of first sliding grooves 121 which are in sliding fit with the X-direction sliding rails, the X-direction variable-pitch plate 12 is provided with two first sliding grooves 121 which are spaced in the Y-axis direction, a mounting groove is arranged between the two first sliding grooves 121, and two ends of the X-direction variable-pitch plate 12 are provided with first bearings 122; the Y-direction variable-pitch plate 13 passes through the plurality of X-direction variable-pitch plates 12 and is in sliding fit with the Y-direction sliding rails, the Y-direction variable-pitch plate 13 is provided with a second sliding chute 131 along the X-axis direction, and two ends of the Y-direction variable-pitch plate 13 are provided with second bearings 132; the plug-in nozzle assemblies are provided with a plurality of groups of X-direction variable-pitch plates 12 corresponding to the X-direction variable-pitch plates, each plug-in nozzle assembly is provided with three plug-in nozzles, namely a fixed plug-in nozzle 141 and two sliding plug-in nozzles 142, the fixed plug-in nozzles 141 are arranged in the mounting grooves, and the two sliding plug-in nozzles 142 penetrate through the second sliding grooves 131 and are respectively and slidably arranged in the two first sliding grooves 121; the X-direction driving assembly 15 is arranged on the sliding seat 11, the X-direction driving assembly 15 comprises an X-direction driving device 151 and two X-direction adjusting plates 152, the X-direction adjusting plates 152 are provided with a plurality of X-direction sliding grooves 1521 which are distributed radially, a plurality of X-direction distance changing plates 12 are arranged between the two X-direction adjusting plates 152, the first bearing 122 is in sliding fit with the X-direction sliding grooves 1521, and the X-direction driving device 151 drives the two X-direction adjusting plates 152 to slide up and down synchronously; the Y-direction driving assembly 16 is arranged on the sliding seat 11, the Y-direction driving assembly 16 comprises a Y-direction driving device 161 and two Y-direction adjusting plates 162, the Y-direction adjusting plates 162 are provided with two symmetrical Y-direction sliding grooves 1621 which are arranged in an angle mode, the two Y-direction distance changing plates 13 are arranged between the two Y-direction adjusting plates 162, the second bearing 132 is in sliding fit with the Y-direction sliding grooves 1621, and the Y-direction driving assembly 16 drives the two Y-direction adjusting plates 162 to slide up and down synchronously.

It will be appreciated that the first runner 121 and the second runner 131 limit the sliding range of the sliding plug 142, thereby enabling pitch adjustment, and when the X-direction pitch plate 12 is moved, the sliding plug is pushed to move in the direction of the second runner 131, and when the Y-direction pitch plate 13 is moved, the sliding plug is pushed to move in the direction of the first runner 121. The first bearings 122 disposed at two ends of the X-direction displacement plate 12 extend into the X-direction sliding grooves 1521 corresponding to the positions and are in sliding fit with the X-direction sliding grooves 1521, the plurality of X-direction sliding grooves 1521 are radially distributed, when the X-direction driving device 151 drives the two X-direction adjusting plates 152 to slide up and down synchronously, the positions of the first bearings 122 in the X-direction sliding grooves 1521 are changed because the X-direction displacement plates 12 can only move along the X-direction guide rail, so that the plurality of X-direction displacement plates 12 are mutually close or mutually far away along the X-axis direction, and the sliding plug 142 is driven to move along the direction of the second sliding groove 131 by the movement of the X-direction displacement plates 12. Similarly, the second bearings 132 disposed at two ends of the Y-direction displacement plate 13 extend into the Y-direction sliding grooves 1621 corresponding to the positions and are in sliding fit with the Y-direction sliding grooves 1621, the two Y-direction sliding grooves 1621 are symmetrically and angularly disposed, when the Y-direction driving device 161 drives the two Y-direction adjustment plates 162 to slide up and down synchronously, the positions of the second bearings 132 in the Y-direction sliding grooves 1621 are changed so that the two Y-direction displacement plates 13 are moved closer to or away from each other in the Y-axis direction, and the movement of the Y-direction displacement plates 13 drives the sliding plug 142 to move in the direction of the first sliding groove 121.

The X-direction distance-changing plate 12 is provided with eight plug-in connectors, and each plug-in connector assembly is provided with three plug-in connectors, so that the utility model can realize the adjustment of the distance between twenty-four plug-in connectors and is suitable for 24-hole plates, 48-hole plates, 96-hole plates or 384-hole plates which are conventionally used at present.

According to the utility model, the synchronous opening and closing of the plurality of X-direction distance changing plates 12 are realized through the two X-direction adjusting plates 152, and the synchronous opening and closing of the two Y-direction distance changing plates 13 are realized through the two Y-direction adjusting plates 162, so that the synchronous sliding of the two ends of the X-direction distance changing plates 12 and the Y-direction distance changing plates 13 can be realized, and the problem of asynchronous action caused by single-side driving is avoided.

The technical proposal of the utility model comprises a sliding seat 11, a plurality of X-direction distance changing plates 12, two Y-direction distance changing plates 13, a plug assembly, an X-direction driving assembly 15 and a Y-direction driving assembly 16, wherein two X-direction adjusting plates 152 of the X-direction driving assembly 15 are positioned at two sides of the plurality of X-direction distance changing plates 12, a first bearing 122 of the X-direction distance changing plate 12 is in sliding fit with an X-direction chute 1521 of the X-direction adjusting plate 152, an X-direction driving device 151 of the X-direction driving assembly 15 drives the two X-direction adjusting plates 152 to synchronously slide up and down so as to realize that the plurality of X-direction distance changing plates 12 are mutually close to or mutually far away along the X-axis direction, two Y-direction adjusting plates 162 of the Y-direction driving assembly 16 are positioned at two sides of the two Y-direction distance changing plates 13, and the second bearing 132 of the Y-direction variable-pitch plate 13 is in sliding fit with the Y-direction sliding groove 1621 of the Y-direction adjusting plate 162, and the Y-direction driving device 161 of the Y-direction driving assembly 16 drives the two Y-direction adjusting plates 162 to synchronously slide up and down so as to realize that the two Y-direction variable-pitch plates 13 are close to or far away from each other along the Y-axis direction, and the plug assembly is slidably arranged at the position of the sliding groove, so that synchronous movement is realized along with the movement of the X-direction variable-pitch plate 12 and the Y-direction variable-pitch plate 13, namely, the technical means that the adjusting plates are arranged on both sides of the variable-pitch plate so as to realize synchronous driving are adopted, so that the technical problems of asynchronous sliding and influence on variable-pitch in the single-side driving in the prior art are effectively solved, and the technical effects of synchronous driving and improvement of the variable-pitch effect are realized.

In the embodiment of the present utility model, as shown in fig. 7, the X-direction driving assembly 15 further includes a first fixing plate 153 and a first connecting plate 154, wherein two first fixing plates 153 are disposed on opposite sides of the sliding seat 11, and two X-direction adjusting plates 152 are respectively slidably engaged with the two first fixing plates 153; the first connecting plate 154 is used for connecting the two X-direction adjusting plates 152; the X-direction driving device 151 is provided on any one of the first fixing plates 153, and drives the X-direction adjusting plate 152 slidably engaged with the first fixing plate 153. The two X-direction adjusting plates 152 are connected through the first connecting plate 154, and the X-direction driving device 151 is connected with one of the X-direction adjusting plates 152, that is, the X-direction driving device 151 drives the two X-direction adjusting plates 152 to move synchronously.

In the embodiment of the present utility model, as shown in fig. 8, the Y-direction driving assembly 16 further includes two second fixing plates 163 and a second connecting plate 164, wherein the second fixing plates 163 are disposed on two opposite sides of the sliding seat 11, the second fixing plates 163 and the first fixing plates 153 are disposed on different sides of the sliding seat 11, and the two Y-direction adjusting plates 162 are respectively slidably engaged with the two second fixing plates 163; the second connecting plate 164 is used for connecting the two Y-direction adjusting plates 162; the Y-direction driving device 161 is provided to any one of the second fixing plates 163, and drives the Y-direction adjusting plate 162 slidably engaged with the second fixing plate 163. The two Y-direction adjusting plates 162 are connected through the second connecting plate 164, and the Y-direction driving device 161 is connected with one of the Y-direction adjusting plates 162, that is, the Y-direction driving device 161 drives the two Y-direction adjusting plates 162 to move synchronously.

In the embodiment of the present utility model, as shown in fig. 7, the X-direction driving device 151 includes a motor base 1511 and a penetrating motor 1512, wherein the motor base 1511 is disposed on any first fixing plate 153; the penetration motor 1512 has a screw rod that can move up and down, and the screw rod is connected to the X-direction adjusting plate 152. The utility model realizes the distance adjustment in a mode of screw rod adjustment and has the characteristics of wide adjustment range and high precision.

In the embodiment of the present utility model, the structure of the X-direction driving device 151 is the same as that of the Y-direction driving device 161, and will not be described herein.

In the embodiment of the present utility model, as shown in fig. 1, 2, 7 and 8, the X-direction driving assembly 15 further includes a first photoelectric sensor 155 and a first sensing piece 156, the first photoelectric sensor 155 is disposed on any one of the first fixing plates 153, and the first sensing piece 156 is disposed on the X-direction adjusting plate 152 slidably engaged with the first fixing plate 153; the Y-direction driving assembly 16 further includes a second photosensor 165 and a second sensing piece 166, wherein the second photosensor 165 is disposed on any one of the second fixing plates 163, and the second sensing piece 166 is disposed on the Y-direction adjusting plate 162 slidably engaged with the second fixing plate 163. The position of the X-direction adjusting plate 152 or the Y-direction adjusting plate 162 is fed back by the photoelectric sensor and the sensing piece.

In the embodiment of the present utility model, as shown in fig. 7 and 8, the first fixing plate 153 and the X-direction adjusting plate 152 are slidably engaged with each other through the rail slider, and the second fixing plate 163 and the Y-direction adjusting plate 162 are slidably engaged with each other through the rail slider. The guide precision can be improved and the friction force in the sliding process can be reduced through the guide rail sliding block structure.

In the embodiment of the utility model, the X-direction variable-pitch plate 12 and the X-direction sliding rail are in sliding fit through a linear bearing, and the Y-direction variable-pitch plate 13 and the Y-direction sliding rail are in sliding fit through a linear bearing. The linear bearing can improve the guiding precision and reduce the friction force in the sliding process.

In the embodiment of the present utility model, as shown in fig. 6, the sliding plug 142 is in a square shape in a sliding fit with the first sliding groove 121 and the second sliding groove 131. The square structure is used for better matching with the first chute 121 and the second chute 131, so that the gap between the sliding plug nozzle 142 and the chute is reduced, and the position accuracy is improved.

The present utility model further proposes a pipetting device 100, as shown in fig. 9, where the pipetting device 100 includes a distance changing assembly 10 and a pipetting assembly 20, and the specific structure of the distance changing assembly 10 refers to the above embodiment, and since the pipetting device 100 adopts all the technical solutions of all the embodiments, at least has all the beneficial effects brought by the technical solutions of the embodiments, and will not be described in detail herein. The pipetting assembly 20 is disposed at the top of the sliding seat 11, and the pipetting assembly 20 has a plurality of pipetting nozzles 21, and the pipetting nozzles 21 are in one-to-one correspondence with the plugs and are connected by hoses 30.

The foregoing description is only of the optional embodiments of the present utility model, and is not intended to limit the scope of the utility model, and all the equivalent structural changes made by the description of the present utility model and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims (10)

1. A gauge assembly for accommodating gauge plates of different specifications, the gauge assembly comprising:

the sliding seat is provided with an X-direction sliding rail and a Y-direction sliding rail;

the X-direction distance changing plate is provided with a plurality of first sliding grooves which are spaced in the Y-axis direction and are in sliding fit with the X-direction sliding rails, a mounting groove is formed between the two first sliding grooves, and first bearings are arranged at two ends of the X-direction distance changing plate;

the two Y-direction distance changing plates penetrate through the plurality of X-direction distance changing plates and are in sliding fit with the Y-direction sliding rails, the Y-direction distance changing plates are provided with second sliding grooves along the X-axis direction, and two ends of each Y-direction distance changing plate are provided with second bearings;

the plug-in nozzle assembly is provided with a plurality of groups of X-direction distance changing plates corresponding to the X-direction distance changing plates, each plug-in nozzle assembly is provided with three plug-in nozzles, namely a fixed plug-in nozzle and two sliding plug-in nozzles, the fixed plug-in nozzles are arranged in the mounting grooves, and the two sliding plug-in nozzles penetrate through the second sliding grooves and are respectively and slidably arranged in the two first sliding grooves;

the X-direction driving assembly is arranged on the sliding seat and comprises an X-direction driving device and two X-direction adjusting plates, the X-direction adjusting plates are provided with a plurality of X-direction sliding grooves which are distributed radially, a plurality of X-direction distance changing plates are positioned between the two X-direction adjusting plates, the first bearing is in sliding fit with the X-direction sliding grooves, and the X-direction driving device drives the two X-direction adjusting plates to slide up and down synchronously;

the Y-direction driving assembly is arranged on the sliding seat and comprises a Y-direction driving device and two Y-direction adjusting plates, the Y-direction adjusting plates are provided with two symmetrical Y-direction sliding grooves which are arranged in an angle mode, the two Y-direction distance changing plates are positioned between the two Y-direction adjusting plates, the second bearing is in sliding fit with the Y-direction sliding grooves, and the Y-direction driving assembly drives the two Y-direction adjusting plates to slide up and down synchronously.

2. The pitch assembly of claim 1, wherein the X-direction drive assembly further comprises:

the X-direction adjusting plates are respectively matched with the two first fixing plates in an up-down sliding way;

the first connecting plate is used for connecting the two X-direction adjusting plates;

the X-direction driving device is arranged on any one of the first fixing plates and drives the X-direction adjusting plate in sliding fit with the first fixing plate.

3. The pitch assembly of claim 2, wherein the Y-drive assembly further comprises:

the two Y-direction adjusting plates are respectively matched with the two second fixing plates in an up-down sliding way;

the second connecting plate is used for connecting the two Y-direction adjusting plates;

the Y-direction driving device is arranged on any one of the second fixing plates and drives the Y-direction adjusting plate in sliding fit with the second fixing plate.

4. The pitch assembly of claim 2, wherein the X-direction drive means comprises:

the motor seat is arranged on any one of the first fixing plates;

the penetrating motor is provided with a screw rod capable of moving up and down, and the screw rod is connected with the X-direction adjusting plate.

5. The pitch assembly of claim 4, wherein the X-direction drive is configured identically to the Y-direction drive.

6. The pitch assembly of claim 3, wherein the X-direction drive assembly further comprises a first photosensor and a first sensing piece, the first photosensor being disposed on any one of the first fixed plates, the first sensing piece being disposed on the X-direction adjustment plate in sliding engagement with the first fixed plate; the Y-direction driving assembly further comprises a second photoelectric sensor and a second sensing piece, wherein the second photoelectric sensor is arranged on any one of the second fixing plates, and the second sensing piece is arranged on the Y-direction adjusting plate in sliding fit with the second fixing plate.

7. A range assembly according to claim 3, wherein the first fixed plate is slidably engaged with the X-direction adjustment plate via a guide rail slider, and the second fixed plate is slidably engaged with the Y-direction adjustment plate via a guide rail slider.

8. The pitch assembly of claim 1, wherein the X-direction pitch plate is in sliding engagement with the X-direction slide rail via a linear bearing, and the Y-direction pitch plate is in sliding engagement with the Y-direction slide rail via a linear bearing.

9. The pitch assembly of claim 1, wherein the sliding plug is square in position for sliding engagement with the first runner and the second runner.

10. A pipetting device, the pipetting device comprising:

a pitch assembly as claimed in any one of claims 1 to 9;

the pipetting assembly is arranged at the top of the sliding seat and is provided with a plurality of pipetting nozzles, and the pipetting nozzles are in one-to-one correspondence with the plugs and are connected through hoses.