Pipette head withdrawing mechanism of multi-channel pipettor and pipettor

Abstract

The utility model belongs to the technical field of pipettors, and relates to a pipette tip withdrawing mechanism of a multi-channel pipette and the pipettor, the pipette tip withdrawing mechanism comprises a plurality of needle withdrawing sleeves movably sleeved on a plurality of pipette tip rods of a multi-channel pipette body, and each needle withdrawing sleeve slides on the corresponding pipette tip rod; the gun withdrawing plate is movably connected to the base of the pipettor body; the gun withdrawing plate is matched with a plurality of needle withdrawing tubes for use; the gun withdrawing plate is movably connected to the base of the pipettor body through the elastic connecting piece; the middle part of the swinging part is rotationally connected to the base of the pipettor body; the power execution part is connected to the base of the pipettor body; the output end of the power execution part is movably connected with the other end of the swing part, and one end of the swing part is used in cooperation with the gun withdrawing plate. After the structure is adopted, the pipette withdrawing device has the beneficial effects that the pipette withdrawing action of the pipette head is carried out by adopting the lever principle, so that the pipetting precision and the overall layout space reasonability are improved; and the multi-channel gun head withdrawing action is good in synchronism and high in practicability.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipettes, and more specifically, relates to a needle retraction mechanism for a multi-channel pipette and a pipette. Background Art

[0002] In biochemical experiments and clinical detections, pipettes are one of the core devices in the entire experimental process, and automatic pipettes are an important part of automated workstations. In particular, multi-channel pipettes (such as 8-channel, 12-channel, 96-channel, 384-channel automatic pipettes) configured for higher efficiency. Currently, in multi-channel liquid transfer devices, for the needle retraction of the pipette tips, basically, the retraction plate is directly connected to the movable end of the cylinder. Through the movement of the movable end of the cylinder, the pipette tips are removed in cooperation with the retraction plate. In this way, there will be a certain delay when the movable end of the cylinder moves, resulting in the inability to synchronously retract the needles of multiple tips, thus affecting the liquid suction and discharge operations of the liquid transfer device. Therefore, it is necessary to make improvements. Summary of the Utility Model

[0003] To solve the above problems of the prior art, the utility model provides a needle retraction mechanism for a multi-channel pipette and a pipette, which has a simple structure and strong practicability.

[0004] To achieve the above object, the utility model adopts the following technical solutions:

[0005] As one aspect of the utility model, a needle retraction mechanism for a multi-channel pipette is proposed, which includes:

[0006] A plurality of needle retraction sleeves movably sleeved on a plurality of tip rods of the multi-channel pipette body, and each needle retraction sleeve slides on the corresponding tip rod;

[0007] A needle retraction plate movably connected to the base of the pipette body; the needle retraction plate is used in cooperation with a plurality of needle retraction tubes;

[0008] An elastic connecting member, and the needle retraction plate is movably connected to the base of the pipette body through the elastic connecting member;

[0009] A swing member, and the middle part of the swing member is rotatably connected to the base of the pipette body;

[0010] A power execution part, and the power execution part is connected to the base of the pipette body; the output end of the power execution part is movably connected to the other end of the swing member, and one end of the swing member is used in cooperation with the needle retraction plate.

[0011] Optionally, the upper ends of a plurality of needle retraction sleeves are all in cooperation with the needle retraction plate, and the needle retraction plate is provided with a plurality of connection holes corresponding to the plurality of needle retraction sleeves; each tip rod can movably pass through the corresponding connection hole and is in cooperation with the corresponding needle retraction sleeve.

[0012] Optionally, a pressing member is movably connected to one end of the swinging member close to the needle retracting sleeve, and the pressing member is used in cooperation with the gun retracting plate.

[0013] Optionally, a guide rod is further included, and the guide rod is connected to the pressing member; a through hole for the guide rod to movably pass through is provided on the base or the pipette body, and the guide rod movably passes through the through hole.

[0014] Optionally, a guiding unit is further included, and the guiding unit includes a guide rod and a guide sleeve slidably connected to the guide rod. The guide rod is connected to the gun retracting plate; the guide sleeve is connected to the base.

[0015] Optionally, pressing extension blocks are respectively extended from both ends of the pressing member.

[0016] Optionally, an avoidance space is formed between the pressing member and the corresponding pressing extension block.

[0017] Optionally, a connecting portion is further included, and the power execution portion is connected to the swinging member through the connecting portion.

[0018] Optionally, the connecting portion includes a connecting block slidably connected to the swinging member. The output end of the power execution portion is connected to the connecting block, and a connecting convex portion is connected to the connecting block. The connecting convex portion is movably connected to the swinging active portion on the swinging member.

[0019] As another aspect of the present invention, a pipette is provided, including the gun head retracting mechanism of the multi-channel pipette as described above.

[0020] The gun head retracting mechanism and the pipette of the multi-channel pipette of the present invention have the following beneficial effects: 1. The lever principle is adopted for the gun head retracting action, which improves the pipetting accuracy and the rationality of the overall layout space; the synchronization of the multi-channel gun head retracting actions is good, and the practicability is strong.

[0021] 2. The guiding unit design is adopted to make the gun retracting plate run more smoothly and have higher stability.

[0022] 3. The connecting portion design is adopted to make the connection and movement between the power execution portion and the swinging member more convenient and have high flexibility. Description of the Drawings

[0023] The schematic drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0024] Figure 1 It is a structural installation cross-sectional view of the gun head retracting mechanism of the multi-channel pipette of the present invention;

[0025] Figure 2 This is a structural installation sectional view of the swing part and the pressing part of the present utility model;

[0026] Figure 3 This is an exploded view of the structure of the swing part and the pressing part of the present utility model;

[0027] Figure 4 This is the main structural installation view of the gun head withdrawing mechanism of the multi-channel pipette of the present utility model;

[0028] Figure 5 This is the side structural installation view of the gun head withdrawing mechanism of the multi-channel pipette of the present utility model;

[0029] Figure 6 This is the main exploded structural installation view of the gun head withdrawing mechanism of the multi-channel pipette of the present utility model;

[0030] Figure 7 This is the side exploded structural installation view of the gun head withdrawing mechanism of the multi-channel pipette of the present utility model;

[0031] Figure 8 This is an exploded view of the structure of the gun head withdrawing mechanism of the multi-channel pipette of the present utility model;

[0032] Figure 9 This is the side structural view of the swing part and the pressing plate of the present utility model;

[0033] Figure 10 This is an exploded view of the structure of the connecting part of the present utility model;

[0034] Explanation of reference numerals: 1 - gun head rod; 11 - pipette body; 13 - base; 131 - through hole;

[0035] 2 - needle withdrawing sleeve;

[0036] 3 - gun head withdrawing plate; 31 - connecting hole;

[0037] 4 - guide rod;

[0038] 5 - swing part; 51 - swing moving part;

[0039] 6 - pressing part; 61 - avoidance space; 62 - pressing extension block; 63 - second mounting hole;

[0040] 7 - power execution part;

[0041] 8 - guiding unit; 81 - guide rod; 82 - guide sleeve;

[0042] 9 - connecting part; 91 - connecting block; 92 - connecting convex part;

[0043] 10 - elastic connecting piece. Detailed implementation manners

[0044] For better explaining the present utility model for easier understanding, the present utility model will be described in detail below in conjunction with the accompanying drawings through specific implementation manners.

[0045] The needle retracting mechanism of a multi-channel pipette according to an embodiment of the present application is shown as Figures 1 - 7 follows: A plurality of needle retracting sleeves 2 are movably sleeved on a plurality of pipette tips 1 of the multi-channel pipette body 11, and each of the needle retracting sleeves 2 slides on the corresponding pipette tip 1; the plurality of pipette tips 1 are arranged in a rectangular array to form a multi-row layout, and the plurality of needle retracting sleeves 2 also correspondingly form a multi-row layout. It should be noted that the multi-channel pipette body 11 includes a base 13, and a plurality of pipette tips 1 are connected to the base 13. A channel is formed in each pipette tip 1; one end of each pipette tip 1 is detachably connected to a pipette tip for sucking and discharging liquid, and the other end of each pipette tip 1 is connected to the corresponding pipetting gun; the structure and working principle of the multi-channel pipette body 11 are prior arts and will not be elaborated here;

[0046] A needle retracting plate 3 is movably connected to the base 13 of the pipette body 11; the needle retracting plate 3 is used in cooperation with the plurality of needle retracting tubes 2; when the needle retracting plate 3 moves downward, the plurality of needle retracting tubes 2 are synchronously pressed downward, so that the plurality of needle retracting tubes 2 perform a synchronous needle retracting action for the pipette tips;

[0047] Preferably, the upper ends of the plurality of needle retracting sleeves 2 are all connected to the needle retracting plate 3, and the multi-row needle retracting sleeves 2 are all connected to the needle retracting plate 3. The synchronous needle retracting action of the multi-row needle retracting sleeves 2 is realized through the needle retracting plate 3; a plurality of connection holes 31 corresponding to the plurality of needle retracting sleeves 2 are provided on the needle retracting plate 3; each pipette tip 1 can movably pass through the corresponding connection hole 31 and cooperate with the corresponding needle retracting sleeve 2; the needle retracting plate 3 drives the plurality of needle retracting sleeves 2 to move up and down relative to the multi-channel pipette body 11, so that the plurality of needle retracting sleeves 2 act synchronously to perform a synchronous needle retracting action on the plurality of pipette tips;

[0048] An elastic connecting member 10, the needle retracting plate 3 is movably connected to the base 13 of the pipette body 11 through the elastic connecting member 10; as an example, the elastic connecting member 10 is a spring; when the pipette tips are not retracted, the elastic connecting member 10 is in a preset compressed state, and the elastic connecting member 10 in the preset compressed state makes the needle retracting sleeve 2 in a position at a preset height on the pipette tip 1;

[0049] The swing member 5 is rotatably connected to the base 13 of the pipette body 11; as an example, the middle part of the swing member 5 is rotatably connected to the base 13 of the pipette body 11; both ends of the swing member 5 form a lever structure with the middle part as the fulcrum; one end of the swing member 5 close to the needle retraction sleeve 2 is connected with a pressing member 6; the pressing member 6 is located above the gun retraction plate 3, and the pressing member 6 presses down on the gun retraction plate 3, so that the gun retraction plate 3 drives the needle retraction sleeve 2 to perform the gun head retraction action;

[0050] The power execution part 7 is connected to the base 13 of the pipette body 11; the output end of the power execution part 7 is movably connected to the other end of the swing member 5; as an example, the power execution part 7 is a forward and reverse motor, which is a prior art and will not be elaborated here; when the power execution part 7 works and drives the other end of the swing member 5 to move upward with the middle part of the swing member 5 as the fulcrum, it drives the pressing member 6 at one end of the swing member 5 to press down, and drives the lower end of the needle retraction sleeve 2 to perform the gun head retraction action on the gun head rod 1; when the power execution part 7 works and drives the other end of the swing member 5 to move downward with the middle part of the swing member 5 as the fulcrum, the swing member 5 drives the pressing member 6 to separate from the gun retraction plate 3, and the gun retraction plate 3 returns to its original position under the action of the elastic connecting member 10.

[0051] In one embodiment, as Figures 8 - 10 shown, both ends of the pressing member 6 respectively extend to form pressing extension blocks 62, and an avoidance space 61 is formed between the pressing member 6 and the corresponding pressing extension blocks 62, so that the acting force of the swing member 5 acts on the gun retraction plate 3 evenly through the pressing extension blocks 62.

[0052] In one embodiment, as Figures 2 - 3 shown, a guide rod 4 is connected to the pressing member 6. When the pressing member 6 is rotatably connected to one end of the swing member 5, a through hole 131 for the guide rod 4 to movably pass through is provided on the base 13 or the pipette body 11, and the guide rod 4 movably passes through the through hole 131; the size of the through hole 131 is larger than the diameter of the guide rod 4, which is used for guiding the pressing member 6 to realize the movement between the pressing member 6 and the needle retraction sleeve 2. As an example, the through hole 131 is a waist-shaped hole, etc., the cross-sectional shape of the guide rod 4 is circular, etc., and the size of the through hole 131 is larger than the diameter of the guide rod 4. With such a design, when the swing member 5 moves, a movement compensation is formed between the guide rod 4 and the through hole 131. Specifically: the gap formed between the size of the through hole 131 and the size of the guide rod 4, this gap is used as the swing member 5 rotates around its middle rotation point, the pressing member 6 rotates with the pin shaft of the second mounting hole 63 as the fulcrum, and the guide rod 4 can move in the through hole 131. This movement includes but is not limited to up and down movement, left and right movement.

[0053] Or when the pressing member 6 is slidably connected to one end of the swinging member 5, the sliding connection method is similar to the sliding method of the connecting convex portion 92 and the swinging movable portion 51. For example, a chute is provided at one end of the swinging member 5, a connecting convex portion is connected to the pressing member 6, and the connecting convex portion is slidably connected to the chute. As a motion compensation, a through hole 131 for the guiding rod 4 to pass through is provided on the base 13 or the pipette body 11. The guiding rod 4 is movably disposed in the through hole 131. At this time, the guiding rod 4 and the through hole 131 are slidably connected for guiding the pressing member 6. Since the pressing member 6 is rotatably connected to the guiding rod 4, during the movement of the guiding rod 4, the pressing member 6 is actuated.

[0054] In one embodiment, as Figure 7 shown, a guiding unit 8 is further included. The guiding unit 8 includes a guiding rod 81 and a guiding sleeve 82 slidably connected to the guiding rod 81. The guiding rod 81 is connected to the gun withdrawing plate 3; the guiding sleeve 82 is connected to the base 13. By adopting the guiding unit 8, the movement of the gun withdrawing plate 3 is made more stable. As an example, the elastic connecting member 10 is sleeved on the guiding rod 81.

[0055] In one embodiment, as Figure 3 、 Figure 9 and Figure 10 shown, a connecting portion 9 is further included. The power execution portion 7 is connected to the swinging member 5 through the connecting portion 9. The connecting portion 9 includes a connecting block 91 slidably connected to the swinging member 5. It should be noted that the connecting block 91 is connected to the swinging member 5 by a sliding method, such as a chute. The output end of the power execution portion 7 is connected to the connecting block 91. The output end of the power execution portion 7 is threadedly connected to the connecting block 91. A connecting convex portion 92 is connected to the connecting block 91, and the connecting convex portion 92 is movably connected to the swinging movable portion 51 on the swinging member 5.

[0056] As an example, the swinging movable portion 51 is a chute provided in the swinging member 5. When the swinging movable portion 51 is a chute, the connecting convex portion 92 and the chute form a sliding connection. In this embodiment, the power execution portion 7 is a forward and reverse motor. The output end of the power execution portion 7 is threadedly connected to the connecting block 91. By the forward or reverse operation of the power execution portion 7, the connecting convex portion 92 is driven to move up or down on the swinging movable portion 51 of the swinging member 5. Or when the power execution portion 7 is a lifting motor or a lifting cylinder, the output end of the power execution portion 7 is detachably connected to the connecting block 91. By the forward or reverse operation of the power execution portion 7, the connecting convex portion 92 is driven to move up or down on the swinging movable portion 51 of the swinging member 5.

[0057] During implementation, under the control of the power execution unit 7, the swing member 5 moves the pressing member 6 downward, drives the needle retracting sleeve 2 through the gun withdrawing plate 3 to move downward along the gun head rod 1 together, and the needle retracting sleeve 2 pushes the used gun head downward to complete the gun head withdrawing action; then the power execution unit 7 reverses its operation, the swing member 5 drives the pressing member 6 to move upward, and the gun withdrawing plate 3 returns to its original position under the action of the elastic connecting member 10 to facilitate the installation of the next gun head.

[0058] A pipette according to an embodiment of the present application includes the gun head withdrawing mechanism of the multi-channel pipette as described above.

[0059] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0060] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that for the convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0061] In the description of the present application, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Without contrary instructions, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the protection scope of the present application; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0062] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. can be used here to describe the spatial positional relationship of a device or feature shown in the figure with other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figure for the device. For example, if the device in the drawing is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0063] In addition, it should be noted that the use of terms such as "first", "second" etc. to define components is only for the convenience of differentiating the corresponding components. Without additional statements, the above terms have no special meanings, and thus should not be construed as limiting the protection scope of this application.

[0064] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, terms such as "installed", "provided with", "connected" etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0065] The above are only the preferred embodiments of the present utility model. All equivalent changes and modifications made according to the scope of the patent application of the present utility model shall fall within the coverage scope of the present utility model.

Claims

1. A tip retracting mechanism for a multi-channel pipette, characterized in that: It includes: A plurality of needle withdrawal sleeves (2) movably sleeved on a plurality of gun head rods (1) of a multi-channel pipette body (11), each of the needle withdrawal sleeves (2) sliding on a corresponding gun head rod (1); A gun retracting plate (3) is movably connected to a base (13) of a pipette body (11); the gun retracting plate (3) is used in conjunction with a plurality of needle retracting sleeves (2); An elastic connecting member (10), wherein the gun retracting plate (3) is movably connected to a base (13) of the pipette body (11) through the elastic connecting member (10); A swinging member (5), the middle portion of which is rotatably connected to a base (13) of a pipette body (11); A power actuator (7) is connected to a base (13) of a pipette body (11); an output end of the power actuator (7) is movably connected to the other end of a swing member (5), and one end of the swing member (5) is used in conjunction with a gun retracting plate (3).

2. The tip retracting mechanism of the multi-channel pipette according to claim 1, characterized in that: The upper ends of the plurality of needle withdrawal sleeves (2) are matched with the gun withdrawal plate (3), and the gun withdrawal plate (3) is provided with a plurality of connection holes (31) corresponding to the plurality of needle withdrawal sleeves (2); each gun head rod (1) can movably pass through the corresponding connection hole (31) and match with the corresponding needle withdrawal sleeve (2).

3. The tip retracting mechanism of the multi-channel pipette according to claim 1, characterized in that: One end of the swinging member (5) close to the needle withdrawal sleeve (2) is movably connected to a pressing member (6), and the pressing member (6) is used in conjunction with the gun withdrawal plate (3).

4. The tip retracting mechanism of the multi-channel pipette according to claim 3, characterized in that: The invention also comprises a guide rod (4), wherein the guide rod (4) is connected to the pressing member (6); a penetration hole (131) for the guide rod (4) to be movably penetrated is provided on the base (13) or the pipette body (11), and the guide rod (4) is movably penetrated in the penetration hole (131).

5. The tip retracting mechanism of the multi-channel pipette according to claim 1, characterized in that: The invention also comprises a guide unit (8), wherein the guide unit (8) comprises a guide rod (81) and a guide sleeve (82) slidably connected to the guide rod (81), wherein the guide rod (81) is connected to the gun retracting plate (3); and the guide sleeve (82) is connected to the base (13).

6. The tip retracting mechanism of the multi-channel pipette according to claim 3, characterized in that: Both ends of the pressing member (6) extend to form pressing extension blocks (62).

7. The tip retracting mechanism of the multi-channel pipette according to claim 6, characterized in that: An escape space (61) is formed between the pressing member (6) and the corresponding pressing extension block (62).

8. The tip retracting mechanism of the multi-channel pipette according to claim 1, characterized in that: It also comprises a connecting part (9), and the power execution part (7) is connected to the swing member (5) via the connecting part (9).

9. The tip retracting mechanism of the multi-channel pipette according to claim 8, characterized in that: The connecting portion (9) comprises a connecting block (91) slidably connected to the swing member (5); the output end of the power actuator (7) is connected to the connecting block (91); a connecting protrusion (92) is connected to the connecting block (91); and the connecting protrusion (92) is movably connected to a swing movable portion (51) on the swing member (5).

10. A pipette, characterized in that: The invention comprises a gun tip retracting mechanism of a multi-channel pipette as described in any one of claims 1 to 9.

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