CN219039088U - Material returning structure, material returning mechanism and pipetting device - Google Patents

Abstract

The utility model discloses a material returning structure, a material returning mechanism and a pipetting device, and belongs to the technical field of experimental equipment. According to the material returning structure, the material returning mechanism and the liquid transferring device, the material returning parts and the material returning surfaces are at least partially different, so that a plurality of gun heads can be returned in batches, and further, the material returning plate only needs to provide smaller thrust each time, so that the gun heads can be smoothly withdrawn from the suction heads of the liquid transferring device, and the liquid transferring device is prevented from being damaged; meanwhile, the material returning structure adopts a mode that the material returning plate, the fixing piece and the two reinforcing pieces are arranged in a split mode and are fixedly connected to form a whole, compared with the integral forming mode, the parallelism of the material returning plate and the liquid dispenser can be controlled more easily, the stress can be dispersed better, the vibration amplitude is reduced, the material returning plate is more stable in the gun head material returning process, the liquid dispenser is protected, and smooth gun head material returning is promoted.

Description

Material returning structure, material returning mechanism and pipetting device

Technical Field

The utility model relates to the technical field of experimental equipment, in particular to a material returning structure, a material returning mechanism and a pipetting device.

Background

In biological experiments and clinical detection, a pipette is often used, a gun head needs to be pricked and unloaded in the process of completing a pipetting operation by the pipette, and at present, the pipette is mostly manually used for completing the pricking and unloading of the gun head, but for a high-throughput pipette, the operation is tedious and time-consuming, taking a 96-channel pipette as an example, 96 suction heads (also called an adapter) of the pipette are used, and after the gun head is pricked and the gun heads are manually removed one by one, so that the labor is consumed and the time is long.

In order to solve the above problems, the existing 96-channel pipettor is provided with an automatic material returning device to complete automatic material returning of the gun head, specifically, the automatic material returning device comprises a material returning plate and a material returning driving piece, the material returning plate is provided with a plurality of through holes which can be sleeved outside the pipette suction head, the material returning plate is driven to descend by the material returning driving piece, and the bottom surface of the material returning plate can be abutted with the gun head, so that the gun head is withdrawn from the suction head. However, the bottom surface of the material returning plate is an integral plane, 96 gun heads can be synchronously returned, so that a large downward thrust is required to push all gun heads to fall simultaneously, but the material returning plate has overlarge thrust to the gun heads and is easy to generate large vibration, and parts in the liquid transfer device can be damaged. When the downward pushing force of the material returning plate is insufficient or uneven, the material returning of the gun heads of the pipettors is not smooth, so that the phenomenon that the individual gun heads are remained on the suction heads of the pipettors occurs, and the next experiment can possibly occur that the suction heads of the pipettors collide to damage the pipettors. In addition, in order to avoid interference with the pipette tip, the material returning driving piece is connected to one side of the material returning plate, so that the material returning plate is easy to incline or uneven in stress, and smooth material returning of the gun head is also affected.

Disclosure of Invention

The utility model aims to provide a material returning structure, a material returning mechanism and a liquid transferring device, which improve the smoothness of gun head material returning and avoid the problem of gun head retention.

In order to achieve the above object, the following technical scheme is provided:

in a first aspect, a material return structure is provided, comprising:

the material returning plate comprises a mounting surface and a material returning surface which are respectively positioned at two sides of the material returning plate in the thickness direction, the material returning surface is provided with a plurality of material returning parts, the material returning parts are provided with a plurality of material returning through holes which penetrate through the material returning plate, the material returning through holes can be sleeved outside the suction head of the liquid transfer device, and the material returning parts can be abutted to the gun head so as to withdraw the gun head from the suction head of the liquid transfer device; the space between the material returning parts and the material returning surface is at least partially different;

the fixing piece is detachably arranged on the mounting surface and close to one side of the material returning plate, and is used for being connected with the material returning driving piece;

the two reinforcing pieces are detachably arranged on the mounting surface and are respectively positioned at the edges of the mounting surface, and the two reinforcing pieces are respectively detachably connected to the two ends of the fixing piece.

As an alternative to the material returning structure, the reinforcement member is locked to or unlocked from the material returning plate by at least three first reinforcement locking members, the first reinforcement locking members being disposed perpendicular to the mounting surface; and/or the number of the groups of groups,

the reinforcement member is locked or unlocked with the fixing member through at least two second reinforcement locking members, and the second reinforcement locking members are arranged parallel to the mounting surface; and/or the number of the groups of groups,

the fixing piece is locked or unlocked with the material returning plate through a plurality of fixing locking pieces, and the fixing locking pieces are parallel to the mounting surface.

As an alternative scheme of the material returning structure, one of the fixing piece and the material returning plate is provided with a positioning structure, and the other is provided with a positioning matching structure matched with the positioning structure.

As an alternative scheme of the material returning structure, the material returning parts comprise a plurality of first material returning parts which are arranged in a step shape along the first direction; the first direction is perpendicular to the material returning plate and is provided with edges of the fixing piece.

As an alternative to the material-returning structure, the distance between the first material-returning portion and the material-returning surface increases gradually in the first direction toward the direction approaching the fixing member.

As an alternative scheme of the material returning structure, the material returning parts comprise a plurality of second material returning parts which are arranged in a step shape along a second direction; the second direction is perpendicular to the first direction.

As an alternative of the material returning structure, the distance between the second material returning portion and the material returning surface increases gradually from the middle portion of the material returning plate to the two ends along the second direction.

As an alternative to the relief structure, the maximum distance between the first relief portion and the relief surface is smaller than the minimum distance between the second relief portion and the relief surface.

As an alternative scheme of material returning structure, material returning portion be equipped with a plurality of the chamfer that material returning through-hole one-to-one set up, the chamfer with the correspondence the rifle head butt.

As an alternative of the material returning structure, the material returning structure further includes a plurality of pressing plate columns, the pressing plate columns are detachably connected to the material returning surface of the material returning plate, and the pressing plate columns can be abutted to a gun head box containing the gun head so as to enable the gun head to be separated from the gun head box when the suction head of the pipette pierces the gun head.

In a second aspect, a material returning mechanism is provided, including a material returning structure and a material returning driving member as described in any one of the above, where the fixing member is connected to the material returning driving member, so that the material returning driving member can drive the material returning plate to approach or separate from the gun head.

As an alternative to the material returning mechanism, the material returning mechanism further includes:

the mounting substrate is used for being fixedly connected with the pipettor;

the connecting plate is slidably arranged on the mounting substrate and is respectively connected with the material returning driving piece and the fixing piece.

In a third aspect, a pipetting device is provided, including a pipette and a material returning mechanism as described above, where the material returning through hole is sleeved outside a suction head of the pipette.

Compared with the prior art, the utility model has the beneficial effects that:

according to the material returning structure, the material returning mechanism and the liquid transferring device, the material returning parts and the material returning surfaces are at least partially different, so that a plurality of gun heads can be returned in batches, namely, the gun heads corresponding to the material returning parts with smaller spacing between the material returning parts and the material returning surfaces can be withdrawn from the suction heads of the liquid transferring device, and as the material returning plate descends further, the gun heads corresponding to the material returning parts with slightly larger spacing between the material returning surfaces can be withdrawn from the suction heads of the liquid transferring device again, so that the material returning plate only needs to provide smaller thrust each time, and the gun heads can be withdrawn smoothly from the suction heads of the liquid transferring device, and the liquid transferring device is prevented from being damaged; simultaneously, locate the mounting face with mounting detachably and be close to one of them limit setting of material returning plate to utilize the mounting to be connected with material returning driver, locate the mounting face with two equal detachably of reinforcement again and be located the edge of mounting face respectively, and two reinforcement detachably connect in the both ends of mounting respectively, in other words, material returning structure adopts material returning plate, mounting and two reinforcement components of a whole that can function independently setting and fixed connection's form, compare in integrated into one piece, the parallelism of material returning plate and pipettor is easier to control, and can disperse the atress better, reduce the vibration range, make material returning plate more stable at rifle head material returning in-process, be favorable to protecting the pipettor, and promote smooth and easy material returning of rifle head.

Drawings

FIG. 1 is a schematic view of a pipetting device (with gun head) according to an embodiment of the utility model;

FIG. 2 is a schematic view of a pipetting device (without gun head) according to an embodiment of the utility model;

FIG. 3 is an exploded view of a pipette and a reject mechanism according to an embodiment of the present utility model;

fig. 4 is a schematic structural diagram of a material returning mechanism in an embodiment of the present utility model;

FIG. 5 is an exploded view of a material return mechanism according to an embodiment of the present utility model;

FIG. 6 is a schematic diagram of a material returning plate according to an embodiment of the present utility model;

FIG. 7 is a diagram showing the relationship between a pipette device and a gun head box when the gun head is pricked.

Reference numerals:

1. a pipette; 11. a suction head;

2. a material returning mechanism;

21. a material returning structure; 211. a material returning plate; 211a, a mounting surface; 211b, material returning surface; 2111. a material returning part; 2111a, a first material returning part; 2111b, a second material returning part; 2111b1, a middle second material returning part; 2111b2, a side second reject; 21111. a material returning through hole; 21112. chamfering; 2112. a positioning pin; 212. a fixing member; 2121. fixing the locking piece; 213. a reinforcing member; 2131. a second reinforcing locking member; 214. a platen column;

22. a material returning driving piece; 23. a mounting substrate; 231. a slide rail; 232. a slide block; 24. a connecting plate;

3. a gun head; 4. gun head box.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected 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: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; either mechanically or electrically. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

As shown in fig. 1-7, the present embodiment provides a material returning structure, a material returning mechanism and a liquid transferring device, the liquid transferring device includes a liquid transferring device 1 and a material returning mechanism 2, the material returning mechanism 2 includes a material returning structure 21 and a material returning driving member 22, the material returning structure 21 includes a material returning plate 211, the material returning plate 211 includes a mounting surface 211a and a material returning surface 211b respectively located at two sides of the thickness direction thereof, the material returning surface 211b is provided with a plurality of material returning portions 2111, the material returning portions 2111 are provided with a plurality of material returning through holes 21111 penetrating the material returning plate 211, the material returning through holes 21111 can be sleeved outside the suction head 11 of the liquid transferring device 1, and the material returning driving member 22 can drive the material returning plate 211 to approach or separate from the gun head 3 so that the material returning portions 2111 can abut against the gun head 3 to withdraw the gun head 3 from the suction head 11 of the liquid transferring device 1; the distance between the plurality of relief portions 2111 and the relief surface 211b is at least partially different. Thus, a plurality of gun heads 3 can be fed back in batches, namely, the material returning part 2111 with smaller interval between the material returning surfaces 211b can firstly withdraw the gun heads 3 corresponding to the gun heads 3 from the suction head 11 of the liquid dispenser 1, and as the material returning plate 211 descends further, the material returning part 2111 with slightly larger interval between the material returning surfaces 211b can withdraw the gun heads 3 corresponding to the material returning parts from the suction head 11 of the liquid dispenser 1, so that the material returning plate 211 only needs to provide smaller thrust each time, and the gun heads 3 can be withdrawn smoothly from the suction head 11 of the liquid dispenser 1, and the liquid dispenser 1 is prevented from being damaged.

Further, the material returning structure 21 further includes a fixing member 212 and two reinforcing members 213, the fixing member 212 is detachably disposed on the mounting surface 211a and is disposed near one side of the material returning plate 211, and the fixing member 212 is connected to the material returning driving member 22; both the reinforcing members 213 are detachably disposed on the mounting surface 211a and are respectively located at edges of the mounting surface 211a, and both the reinforcing members 213 are respectively detachably connected to both ends of the fixing member 212. In other words, the material returning structure 21 is formed as a whole by adopting the manner that the material returning plate 211, the fixing piece 212 and the two reinforcing pieces 213 are arranged in a split manner and fixedly connected, compared with the integral molding, the material returning plate 211 and the liquid dispenser 1 are easier to control the parallelism, the stress can be better dispersed, the vibration amplitude is reduced, the material returning plate 211 is more stable in the material returning process of the gun head 3, the liquid dispenser 1 is protected, and the smooth material returning of the gun head 3 is promoted. The fixing member 212 and the two reinforcing members 213 are provided at the edge of the mounting surface 211a, and do not interfere with the cooperation of the ejector plate 211 and the pipette 1.

Optionally, the material returning driving piece 22 is a screw motor, so that the stability is good and the displacement precision is high.

Optionally, the material returning mechanism 2 further comprises a mounting substrate 23 and a connecting plate 24, and the mounting substrate 23 is fixedly connected with the pipettor 1; the connecting plate 24 is slidably disposed on the mounting substrate 23, and the connecting plate 24 is connected to the material returning driver 22 and the fixing member 212, respectively. In this way, the material returning mechanism 2 and the liquid shifter 1 are convenient to be matched and installed, and the material returning plate 211 is ensured to be lifted and stabilized.

In this embodiment, the mounting substrate 23 is fixedly mounted on one side of the pipette 1, the mounting substrate 23 is provided with a slide rail 231, the slide rail 231 is slidably connected with a slider 232, the connecting plate 24 is fixedly connected with the slider 232, the connecting plate 24 is guided by the slide rail 231, and the smoothness and stability of lifting of the connecting plate 24 and the material returning plate 211 are improved. Illustratively, in order to further improve the lifting stability of the connecting plate 24 and the material returning plate 211, two sets of sliding rails 231 and sliding blocks 232 are provided, and the two sets of sliding rails 231 and sliding blocks 232 are arranged side by side.

Alternatively, the reinforcement 213 is locked or unlocked to the stripper plate 211 by at least three first reinforcement locks disposed perpendicular to the mounting surface 211 a. Further, the reinforcement 213 is locked or unlocked to the fixing 212 by at least two second reinforcement locks 2131, the second reinforcement locks 2131 being disposed parallel to the mounting face 211 a. Further, the fixing member 212 is locked to or unlocked from the ejector plate 211 by a plurality of fixing locks 2121, the fixing locks 2121 being disposed parallel to the mounting surface 211 a. The arrangement is such that the connection stability of the material returning plate 211, the fixing piece 212 and the two reinforcing pieces 213 is better, the material returning plate 211 is more uniformly stressed, and the parallelism of the material returning plate 211 and the liquid shifter 1 can be ensured.

Illustratively, the first reinforcement lock, the second reinforcement lock 2131 and the fixing lock 2121 are all bolts. In this embodiment, the fixing member 212 and the reinforcing member 213 are both plate-shaped structures and are disposed perpendicular to the mounting surface 211a, so that the fixing member 212 and the reinforcing member 213 are connected to each other, and the driving force of the material returning driving member 22 is transmitted to the material returning plate 211 uniformly. Three first reinforcing locking pieces are arranged and are uniformly distributed along the length direction of the reinforcing piece 213 of the plate-shaped structure; two second reinforcing locking pieces 2131 are provided, and the two second reinforcing locking pieces 2131 are uniformly distributed along the height direction of the reinforcing piece 213 of the plate-shaped structure; the fixing and locking members 2121 are provided with four fixing and locking members 2121 which are uniformly distributed along the length direction of the fixing member 212 having a plate-like structure, so that the connection stability between the material returning plate 211 and the reinforcing member 213 and between the fixing member 212 and the reinforcing member 213 is improved, and the number of the first reinforcing and locking members, the second reinforcing and locking members 2131 and the fixing and locking members 2121 is not excessively increased.

Optionally, one of the fixing member 212 and the material returning plate 211 is provided with a positioning structure, and the other is provided with a positioning matching structure matched with the positioning structure. The positioning structure and the positioning matching structure are matched to improve the position accuracy of the fixing piece 212 and the material returning plate 211, so that the stress uniformity of the material returning plate 211 is improved. In this embodiment, the positioning structure is a positioning pin 2112 provided on the material returning plate 211, and the positioning matching structure is a positioning hole provided on the fixing member 212, and the positioning pin 2112 is inserted into the positioning hole.

Optionally, the plurality of material returning portions 2111 includes a plurality of first material returning portions 2111a and a plurality of second material returning portions 2111b, and the plurality of first material returning portions 2111a are arranged in a step shape along the first direction; the plurality of second material returning parts 2111b are arranged in a step shape along the second direction; the first direction is perpendicular to the edge of the stripper plate 211 where the fixing member 212 is provided, and the second direction is perpendicular to the first direction. In this way, the plurality of gun heads 3 can be fed back in batches along two directions respectively, and the anti-shock force applied to the feeding back plate 211 in the feeding back process of the gun heads 3 is further reduced.

Further, the distance between the first material returning portion 2111a and the material returning surface 211b increases in the first direction in a direction approaching the fixing 212. The plurality of gun heads 3 are sequentially returned along the first direction towards the direction close to the fixing piece 212, in other words, the gun heads 3 farther from the fixing piece 212 finish returning earlier, which is beneficial to reducing the anti-shock force of the returning plate 211 during the returning process of the gun heads 3.

Further, the distance between the second material returning portion 2111b and the material returning surface 211b increases from the middle to both ends of the material returning plate 211 in the second direction. Sequentially returning the plurality of gun heads 3 from the middle part of the material returning plate 211 to the two ends along the second direction, in other words, the gun heads 3 closer to the middle part of the material returning plate 211 along the second direction finish material returning more first, which is also beneficial to reducing the anti-vibration force of the material returning plate 211 in the material returning process of the gun heads 3.

Further, the maximum distance between the first relief portion 2111a and the relief surface 211b is smaller than the minimum distance between the second relief portion 2111b and the relief surface 211 b. In other words, after the gun heads 3 corresponding to the first material returning portions 2111a are all returned, the gun heads 3 corresponding to the second material returning portions 2111b are returned, so that the impact force applied to the material returning plate 211 during the material returning of the gun heads 3 can be reduced.

In the present embodiment, the ninety-six channel pipette 1 is exemplified as an array of ninety-six tips 11, specifically, ninety-six tips 11 are divided into eight rows of twelve tips 11 in the first direction. Correspondingly, the material returning plate 211 is rectangular, the material returning plate 211 is provided with ninety-six material returning through holes 21111, and ninety-six material returning through holes 21111 are arranged in one-to-one correspondence with ninety-six suction heads 11.

Specifically, thirteen material returning portions 2111 are provided, wherein two first material returning portions 2111a are provided, two first material returning portions 2111a are sequentially provided at one end of the material returning plate 211 away from the fixing member 212 along the first direction, and the distance between the two first material returning portions 2111a and the material returning surface 211b increases gradually along the first direction in a direction approaching to the fixing member 212; each of the first reject portions 2111a is provided with twelve reject through holes 21111.

Further, the second material returning portion 2111b is provided with eleven, for convenience of description, the second material returning portion 2111b located at the middle of the material returning plate 211 in the second direction is referred to as a middle second material returning portion 2111b1, the middle second material returning portion 2111b1 is provided with twelve material returning through holes 21111, and the twelve material returning through holes 21111 are divided into two columns of six; the remaining ten second material returning portions 2111b are all denoted as side second material returning portions 2111b2, and the distance between the middle second material returning portion 2111b1 and the material returning surface 211b is smaller than the distance between the side second material returning portion 2111b2 and the material returning surface 211 b; the ten side second material returning portions 2111b2 are divided into two groups, each group of five side second material returning portions 2111b2 are respectively located at two sides of the middle second material returning portion 2111b1 along the second direction, the two groups of side second material returning portions 2111b2 are symmetrically arranged relative to the middle second material returning portion 2111b1, and for each group of side second material returning portions 2111b2, the distance between the five side second material returning portions 2111b2 and the material returning surface 211b increases from the middle to the end of the material returning plate 211 along the second direction; each side second material returning portion 2111b2 is provided with six material returning through holes 21111, in other words, twelve material returning through holes 21111 are provided in total on the second material returning portion 2111b with the same interval between the material returning surfaces 211b, so that the material returning plate 211 can complete material returning of the twelve gun heads 3 each time, the material returning plate 211 is ensured to provide smaller thrust force each time and the thrust force is the same, smooth material returning of the gun heads 3 is ensured, and the counter-vibration force applied to the material returning plate 211 is reduced.

Optionally, the material returning portion 2111 is provided with chamfers 21112 disposed in one-to-one correspondence with the plurality of material returning through holes 21111, and the chamfers 21112 abut against the corresponding gun heads 3. Compared with the prior art, the contact between the material returning plate 211 and the gun head 3 is changed from surface contact to line contact, so that the contact area is reduced, the gun head 3 can be prevented from being attached to the contact surface of the material returning part 2111, the material returning is delayed, the thrust of the material returning part 2111 to the gun head 3 is more concentrated, and the gun head 3 returns smoothly and tidily.

When the tip 11 of the pipette 1 pierces the tip 3, the tip 11 lowers a small distance due to a certain plugging length between the tip 11 and the tip 3, so that a certain adhesion force is generated between the tip 3 and the tip case 4 due to pressure, and the tip case 4 is prevented from being lifted. Optionally, the material returning structure 21 further includes a plurality of pressing plate columns 214, where the pressing plate columns 214 are detachably connected to the material returning surface 211b of the material returning plate 211, and the pressing plate columns 214 can be abutted against the gun head box 4 for holding the gun head 3, so that the gun head 3 is separated from the gun head box 4 when the suction head 11 of the pipette 1 pierces the gun head 3, and normal separation of the gun head 3 and the gun head box 4 is ensured, and the gun head box 4 is prevented from being lifted.

Optionally, the platen post 214 is screwed to the stripper plate 211, so as to facilitate the disassembly and replacement of the platen post 214. Illustratively, one end of the platen post 214 is provided with external threads, and the relief surface 211b of the relief plate 211 is provided with threaded holes that are disposed in mating relationship with the external threads.

In this embodiment, the pressing plate column 214 is a cylinder made of stainless steel material, and has a simple structure and low cost. Four pressing plate columns 214 are provided, and for the rectangular material returning plate 211, four pressing plate columns 214 are respectively arranged at four corners of the material returning plate 211. Of course, the number of the platen columns 214 may be two, three, eight, etc. as required, and is not limited thereto.

Note that the above is only a preferred embodiment of the present utility model and the technical principle applied. It will be understood by those skilled in the art that the present utility model is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, while the utility model has been described in connection with the above embodiments, the utility model is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the utility model, which is set forth in the following claims.

Claims (13)

1. Material returned structure, its characterized in that includes:

the material returning plate (211), the material returning plate (211) comprises a mounting surface (211 a) and a material returning surface (211 b) which are respectively positioned at two sides of the material returning plate in the thickness direction, the material returning surface (211 b) is provided with a plurality of material returning parts (2111), the material returning parts (2111) are provided with a plurality of material returning through holes (21111) penetrating through the material returning plate (211), the material returning through holes (21111) can be sleeved outside a suction head (11) of the liquid transfer device (1), and the material returning parts (2111) can be abutted to a gun head (3) to withdraw the gun head (3) from the suction head (11) of the liquid transfer device (1); the intervals between the material returning parts (2111) and the material returning surfaces (211 b) are at least partially different;

the fixing piece (212) is detachably arranged on the mounting surface (211 a) and is close to one edge of the material returning plate (211), and the fixing piece (212) is used for being connected with the material returning driving piece (22);

and the two reinforcing pieces (213) are detachably arranged on the mounting surface (211 a) and are respectively positioned at the edge of the mounting surface (211 a), and the two reinforcing pieces (213) are respectively detachably connected to the two ends of the fixing piece (212).

2. The blanking structure according to claim 1, characterized in that the reinforcement (213) is locked or unlocked with the blanking plate (211) by at least three first reinforcement locks, which are arranged perpendicular to the mounting surface (211 a); and/or the number of the groups of groups,

the reinforcement (213) is locked or unlocked to the mount (212) by at least two second reinforcement locks (2131), the second reinforcement locks (2131) being arranged parallel to the mounting surface (211 a); and/or the number of the groups of groups,

the fixing member (212) is locked to or unlocked from the material returning plate (211) by a plurality of fixing locking members (2121), and the fixing locking members (2121) are arranged parallel to the mounting surface (211 a).

3. The material returning structure according to claim 1, wherein one of the fixing member (212) and the material returning plate (211) is provided with a positioning structure, and the other is provided with a positioning mating structure mated with the positioning structure.

4. The material returning structure according to claim 1, wherein the plurality of material returning sections (2111) includes a plurality of first material returning sections (2111 a), and the plurality of first material returning sections (2111 a) are arranged in a stepwise manner in the first direction; the first direction is perpendicular to the edge of the material returning plate (211) provided with the fixing piece (212).

5. The material returning structure according to claim 4, wherein a distance between the first material returning portion (2111 a) and the material returning surface (211 b) increases in the first direction toward the fixing member (212).

6. The material returning structure according to claim 5, wherein the plurality of material returning sections (2111) includes a plurality of second material returning sections (2111 b), and the plurality of second material returning sections (2111 b) are arranged in a stepwise manner in the second direction; the second direction is perpendicular to the first direction.

7. The material returning structure according to claim 6, wherein a distance between the second material returning portion (2111 b) and the material returning surface (211 b) increases from a middle portion to both ends of the material returning plate (211) in the second direction.

8. The material return structure according to claim 7, characterized in that a maximum distance between the first material return portion (2111 a) and the material return surface (211 b) is smaller than a minimum distance between the second material return portion (2111 b) and the material return surface (211 b).

9. The material returning structure according to claim 1, wherein the material returning portion (2111) is provided with chamfers (21112) provided in one-to-one correspondence with the plurality of material returning through holes (21111), and the chamfers (21112) abut against the corresponding gun heads (3).

10. The material returning structure according to claim 1, wherein the material returning structure (21) further comprises a plurality of pressing plate columns (214), the pressing plate columns (214) are detachably connected to the material returning surface (211 b) of the material returning plate (211), and the pressing plate columns (214) can be abutted with a gun head box (4) for containing the gun heads (3) so as to enable the gun heads (3) to be separated from the gun head box (4) when the suction heads (11) of the liquid transfer device (1) prick the gun heads (3).

11. The material returning mechanism is characterized by comprising a material returning structure (21) and a material returning driving piece (22) according to any one of claims 1-10, wherein the fixing piece (212) is connected with the material returning driving piece (22) so that the material returning driving piece (22) can drive the material returning plate (211) to be close to or far from the gun head (3).

12. The material return mechanism according to claim 11, wherein the material return mechanism (2) further comprises:

the mounting substrate (23) is used for being fixedly connected with the pipettor (1);

the connecting plate (24), connecting plate (24) slidably locate mounting substrate (23), connecting plate (24) respectively with material returning driver (22) with mounting (212).

13. Pipetting device, characterized by comprising a pipetting device (1) and a material returning mechanism (2) according to claim 11 or 12, wherein the material returning through hole (21111) is sleeved outside the suction head (11) of the pipetting device (1).

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