Pipette head withdrawing mechanism of pipettor and pipettor

Abstract

The utility model belongs to the technical field of pipettors, and relates to a pipette tip withdrawing mechanism and a pipettor, the pipette tip withdrawing mechanism comprises a needle withdrawing sleeve sleeved on a pipette tip rod of a pipette body, and the needle withdrawing sleeve slides on the pipette tip rod; the swing part is rotationally connected to the base of the pipettor body; the middle part of the swinging part is rotationally connected to a base of the pipettor body; the two ends of the swing part form a lever structure with the middle as a fulcrum. The end, close to the needle withdrawing sleeve, of the swing piece is matched with the top of the needle withdrawing sleeve. The execution part is connected to the base of the pipettor body; the output end of the execution part is connected with the other end of the swing part, and the execution part drives the end, away from the needle withdrawing sleeve, of the swing part to press down the needle withdrawing sleeve. After the structure is adopted, the pipettor has the beneficial effects that the gun retreating action of the gun head is carried out by adopting the lever principle, and the needle retreating space design of a needle retreating plate is omitted, so that the integrity of the pipettor is better.

Description

TECHNICAL FIELD

[0001] The utility model belongs to pipette technical field, concretely relates to a kind of mechanism of withdrawing gun head of pipette and pipette. BACKGROUND

[0002] In biochemical experiment and clinical detection, pipette is one of the core devices of the whole experimental process, and the needle withdrawal of pipette tip in current pipetting equipment is basically carried out by the cooperation of needle withdrawal plate and cylinder to detach the pipette tip. Thus, the needle withdrawal space required by the needle withdrawal plate needs to be designed inside the pipetting equipment, which makes the overall layout of the equipment poor and the volume large, resulting in poor cooperation precision between liquid suction and dispensing units and affecting the liquid suction and dispensing precision of the pipetting equipment. Therefore, it is necessary to improve. UTILITY MODEL CONTENT

[0003] To solve the above problems of the prior art, the utility model provides a kind of mechanism of withdrawing gun head of pipette and pipette, which is simple in structure and independent of liquid suction and dispensing unit, without affecting the cooperation precision of liquid suction and dispensing.

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

[0005] As one aspect of the utility model, a kind of mechanism of withdrawing gun head of pipette is provided, which includes: needle withdrawal sleeve is sleeved on the gun head rod of pipette body, and the needle withdrawal sleeve slides on the gun head rod;

[0006] Swing piece, the swing piece is rotatably connected to the base of pipette body;The middle part of the swing piece is rotatably connected to the base of pipette body;Two ends of swing piece form lever structure with middle part as fulcrum;The end of swing piece close to needle withdrawal sleeve is connected with the top of needle withdrawal sleeve;

[0007] Execution part, connected to the base of pipette body;The output end of execution part is connected with the other end of swing piece, and the execution part drives the end of swing piece away from needle withdrawal sleeve to press down needle withdrawal sleeve, or the execution part drives needle withdrawal sleeve to slide upward along gun head rod through swing piece.

[0008] As the second aspect of the utility model, a kind of mechanism of withdrawing gun head of pipette is provided, which includes: needle withdrawal sleeve is sleeved on the gun head rod of pipette body, and the needle withdrawal sleeve slides on the gun head rod;

[0009] Swing piece, the swing piece is rotatably connected to the base of pipette body;The middle part of the swing piece is rotatably connected to the base of pipette body;Two ends of swing piece form lever structure with middle part as fulcrum;The end of swing piece close to needle withdrawal sleeve is connected with the top of needle withdrawal sleeve;

[0010] The execution part is connected to the base of the pipette body; the output end of the execution part is connected to the other end of the swing part, and the execution part drives the swing part to move away from the needle withdrawal sleeve to press down the needle withdrawal sleeve, or the execution part drives the swing part to move away from the needle withdrawal sleeve to lift up the needle withdrawal sleeve.

[0011] The sleeve connecting part includes a guide part movably arranged on the base of the pipette body; the lower end of the guide part is detachably connected to the needle withdrawal sleeve.

[0012] Optionally, the needle withdrawal sleeve is provided with a protrusion; the end of the swing part close to the needle withdrawal sleeve is spaced from the top of the protrusion; the execution part drives the end of the swing part away from the needle withdrawal sleeve to press down the protrusion, or the execution part drives the end of the swing part away from the needle withdrawal sleeve to lift up the protrusion.

[0013] Optionally, one end of the guide part is detachably connected to the protrusion on the needle withdrawal sleeve; the base of the pipette body is provided with a first mounting hole, the guide part is movably arranged in the first mounting hole, and the guide part is provided with an elastic part located in the first mounting hole.

[0014] Optionally, the inductive switch is connected to the base of the pipette body, and the guide part is used in cooperation with the inductive switch.

[0015] Optionally, the execution part is connected to the swing part through a connecting part; the connecting part includes a connecting block slidably connected to the swing part, and the output end of the execution part is connected to the connecting block; the connecting block is connected with a connecting rod, and the connecting rod is connected to the swing connecting part or the swing sliding part on the swing part.

[0016] The execution part is connected to the swing part through a connecting part; the connecting part includes a connecting block movably connected to the swing part, and the output end of the execution part is connected to the connecting block; the connecting block is connected with a connecting rod, and the connecting rod is movably connected to the swing movable part on the swing part.

[0017] Optionally, the auxiliary moving part is connected with a guide rod, when the auxiliary moving part is rotatably connected to one end of the swing part, the base or the pipette body is provided with a penetrating hole for the guide rod to movably penetrate, and the guide rod movably penetrates in the penetrating hole; the size of the penetrating hole is larger than the diameter of the guide rod, and under the action of external force, the guide rod can move in the penetrating hole.

[0018] Or when the auxiliary action piece is slidingly connected to one end of the swing piece, a guide rod is connected to the auxiliary action piece, and a through hole for the guide rod to move through is arranged on the base or the pipette body, and the guide rod moves through the through hole.

[0019] As an option, a wire channel is further arranged on the needle withdrawal sleeve.

[0020] As an option, the elastic piece is arranged on the guide piece, and under normal circumstances, the elastic piece makes the needle withdrawal sleeve be at a preset height position on the gun head rod.

[0021] As an option, an induction unit is further included, and the induction unit is connected to the base or the pipette body; and the guide rod is used in cooperation with the induction unit.

[0022] As another aspect of the present application, a pipette is provided, which comprises the gun head withdrawal mechanism of the pipette as described above.

[0023] The gun head withdrawal mechanism of the pipette and the pipette have the following beneficial effects: 1. The lever principle is used to perform the gun head withdrawal action, so that the space of the pipette cavity is not increased, and the design of the needle withdrawal plate is not increased, and the pipette precision and the overall layout space rationality are improved.

[0024] 2. The elastic piece makes the needle withdrawal sleeve be at a preset height position on the gun head rod, so that the guide part for the gun head on the gun head rod is not completely blocked by the needle withdrawal sleeve, and in order to ensure that the connection part of the gun head rod and the gun head is partially exposed, the installation of the gun head is facilitated.

[0025] 3. The design of the wire channel plays a role in avoiding exposure of the capacitor wire;

[0026] 4. The design of the auxiliary action piece makes the power stroke of the execution part short, and saves cost;

[0027] 5. The design of the sleeve connecting part and the induction switch is used to sense whether the gun head is installed in place, and also makes the return of the needle withdrawal sleeve have protection, so as to ensure that the gun head can be inserted onto the gun head rod. BRIEF DESCRIPTION OF DRAWINGS

[0028] The drawings accompanying the specification provide further understanding of the present application, and the schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute an improper limitation on the present application.

[0029] Figure 1 Fig. 1 is a structure perspective view of a pipette with a gun head withdrawal mechanism according to Embodiment 1 of the present application;

[0030] Figure 2Structure side view of the pipettor with the gun head retracting mechanism of the embodiment 1 of the utility model;

[0031] Figure 3 Structure perspective view of the pipettor with the gun head retracting mechanism of the embodiment 2 of the utility model;

[0032] Figure 4 Structure side view of the pipettor with the gun head retracting mechanism of the embodiment 2 of the utility model;

[0033] Figure 5 Structure perspective view of the gun head retracting mechanism of the embodiment 2 of the utility model;

[0034] Figure 6 Structure bottom view of the gun head retracting mechanism of the embodiment 2 of the utility model;

[0035] Figure 7 Structure sectional view of the gun head retracting mechanism of the embodiment 2 of the utility model;

[0036] Figure 8 Structure schematic view of the connecting part of the utility model;

[0037] Figure 9 Structure schematic view of the auxiliary action part of the utility model;

[0038] Figure 10 Front view of the installation state of the auxiliary action part and the guide rod of the utility model;

[0039] Figure 11 Rear view of the installation state of the auxiliary action part and the guide rod of the utility model;

[0040] Figure 12 Structure exploded view of the auxiliary action part and the guide rod of the utility model;

[0041] Figure 13 Sectional view of the installation state of the auxiliary action part and the guide rod of the utility model;

[0042] Explanation of reference numerals: 1 - gun head rod; 11 - pipettor body; 12 - first mounting hole; 13 - base; 131 - through hole;

[0043] 2 - needle retracting sleeve; 21 - protruding block;

[0044] 31 - guide part;

[0045] 4 - swing part; 41 - swing movable part;

[0046] 5 - execution part;

[0047] 6 - sleeve connecting part; 61 - guide part; 62 - elastic part; 63 - induction switch;

[0048] 7-Connecting part; 71-Connecting block; 72-Connecting rod;

[0049] 8-Auxiliary actuator; 81-Second mounting hole;

[0050] 9-Guide rod. Detailed Implementation

[0051] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0052] Example 1

[0053] One embodiment of this application provides a pipette tip ejection mechanism, such as... Figures 1-2 As shown, it includes: a needle withdrawal sleeve 2 sleeved on the tip rod 1 of the pipette body 11, the needle withdrawal sleeve 2 sliding on the tip rod 1; it should be noted that the pipette body 11 includes a base 13, the tip rod 1 is connected to the base 13, one end of the tip rod 1 is connected to a pipette tip, the other end of the tip rod 1 is connected to a pipette, one end of the tip rod 1 is detachably connected to a pipette tip for aspiration and dispensing liquid; a channel is formed inside the tip rod 1; the other end of the tip rod 1 is connected to a pipette. The structure and working principle of this pipette body 11 are existing technologies and will not be described in detail; a protrusion 21 is formed on the needle withdrawal sleeve 2;

[0054] A swinging component 4 is rotatably connected to the base 13 of the pipette body 11. For example, the middle part of the swinging component 4 is rotatably connected to the base 13 of the pipette body 11. Both ends of the swinging component 4 form a lever structure with the middle part as the fulcrum. One end of the swinging component 4 near the needle withdrawal sleeve 2 is connected to the top of the needle withdrawal sleeve 2. It should be noted that the swinging component 4 and the top of the needle withdrawal sleeve 2 are movably connected. For example, the swinging component 4 has a connecting hole, and the top of the needle withdrawal sleeve 2 has a connecting pin, which is movably connected to the connecting hole; or it is movably connected to the connecting hole via a connecting rod.

[0055] The actuator 5 is connected to the base 13 of the pipette body 11; the output end of the actuator 5 is connected to the other end of the swing member 4; as an example, the actuator 5 is a motor, which is existing technology and will not be described in detail; when the actuator 5 works, it drives the other end of the swing member 4 to move upward or downward with the middle of the swing member 4 as the fulcrum, so that the end of the swing member 4 presses down on the protrusion 21, and drives the end of the needle withdrawal sleeve 2 to withdraw the pipette tip on the pipette tip rod 1; or the actuator 5 drives the needle withdrawal sleeve 2 to slide upward along the pipette tip rod 1 through the swing member 4, so that the needle withdrawal sleeve 2 moves away from the pipette tip, which facilitates the installation of the pipette tip and the pipette tip rod 1.

[0056] As further explained, in this embodiment, such as Figure 1 , Figure 2 and Figure 9 As shown, it also includes an auxiliary action component 8, which is rotatably connected to one end of the swing component 4. The auxiliary action component 8 is provided with a second mounting hole 81, and the auxiliary action component 8 is rotatably connected to the swing component 4 through the cooperation of the second mounting hole 81 and the pin. The bottom of the auxiliary action component 8 is connected to the top of the protrusion 21 on the needle withdrawal sleeve 2. The swing component 4 can achieve a larger range of motion for the needle withdrawal sleeve 2 through the auxiliary action component 8, which is convenient for the overall space layout. The actuator 5 drives the end of the swing component 4 away from the needle withdrawal sleeve 2 to press down on the protrusion 21, so that the needle withdrawal sleeve 2 performs a needle withdrawal action on the gun head, or the actuator 5 drives the needle withdrawal sleeve 2 to slide upward along the gun head rod 1 through the swing component 4, so that the needle withdrawal sleeve 2 is away from the gun head, which is convenient for the installation of the gun head and the gun head rod 1.

[0057] In this embodiment, as Figure 1 and Figure 8 As shown, it also includes a connecting part 7, through which the actuator 5 is connected to the swing member 4, making the connection between the two more convenient; the connecting part 7 includes a connecting block 71 that is slidably connected to the swing member 4. It should be noted that the connecting block 71 is slidably connected to the swing member 4, such as a sliding groove; the output end of the actuator 5 is connected to the connecting block 71, and the output end of the actuator 5 is threadedly connected to the connecting block 71. A connecting rod 72 is connected to the connecting block 71, and the connecting rod 72 is movably connected to the swing movable part 41 on the swing member 4.

[0058] As an example, the swinging movable part 41 is a sliding groove provided in the swing member 4. When the swinging movable part 41 is a sliding groove, the connecting rod 72 and the sliding groove form a sliding connection. In this embodiment, the actuator 5 is a forward and reverse reversing motor. The output end of the actuator 5 is threadedly connected to the connecting block 71. By rotating the actuator 5 forward or in reverse, the swinging movable part 41 of the connecting rod 72 on the swing member 4 moves upward or downward. Or, when the actuator 5 is a lifting motor or a lifting cylinder, the output end of the actuator 5 is detachably connected to the connecting block 71. By rotating the actuator 5 forward or in reverse, the swinging movable part 41 of the connecting rod 72 on the swing member 4 moves upward or downward.

[0059] In this embodiment, as Figure 1 and Figures 9-13As shown, the auxiliary action piece 8 is connected with a guide rod 9, when the auxiliary action piece 8 is rotationally connected with one end of the swing piece 4, the base 13 or the pipette body 11 is provided with a through hole 131 for the guide rod 9 to movably pass through, and the guide rod 9 movably passes through the through hole 131; the size of the through hole 131 is greater than the diameter of the guide rod 9, which is used for guiding the auxiliary action piece 8, so as to realize the action between the auxiliary action piece 8 and the needle retraction sleeve 2. As an example, the through hole 131 is a waist-shaped hole, and the cross-sectional shape of the guide rod 9 is circular. The size of the through hole 131 is greater than the diameter of the guide rod 9. In this way, when the swing piece 4 moves, the guide rod 9 and the through hole 131 form a movement compensation. Specifically, a gap is formed between the size of the through hole 131 and the guide rod 9. During the rotation of the swing piece 4 around the middle rotation point, the auxiliary action piece 8 rotates around the pin shaft of the second mounting hole 81 as the fulcrum, and the guide rod 9 can move in the through hole 131. The movement includes but is not limited to up and down movement and left and right movement.

[0060] When the auxiliary action piece 8 is slidably connected with one end of the swing piece 4, the sliding connection is similar to the sliding connection between the connecting rod 72 and the swing movable part 41. For example, one end of the swing piece 4 is provided with a sliding groove, and the auxiliary action piece 8 is connected with a connecting rod. The connecting rod and the sliding groove are slidably connected. As a movement compensation, the base 13 or the pipette body 11 is provided with a through hole 131 for the guide rod 9 to movably pass through, and the guide rod 9 movably passes through the through hole 131. At this time, the guide rod 9 and the through hole 131 are slidably connected, which is used for guiding the auxiliary action piece 8. Because the auxiliary action piece 8 is rotationally connected with the guide rod 9, the guide rod 9 makes the auxiliary action piece 8 perform the needle retraction action during the movement.

[0061] In this embodiment, the relative displacement is generated between the connecting block 71 and the swing piece 4. Under the action of the output end of the execution part 5, the connecting block 71 can move upward or downward in the vertical direction. When the middle part of the swing piece 4 rotates around the base 13, the movement track of any point of the swing piece 4 except the middle rotation point of the swing piece 4 should be a circular arc around the middle part of the swing piece 4. At this time, the sliding connection point between the connecting block 71 and the swing piece 4 does not generate movement interference. Conversely, when the auxiliary action piece 8 is slidably connected with one end of the swing piece 4 through the sliding connection between the connecting rod 72 and the swing movable part 41, the movement interference does not occur.

[0062] In this embodiment, the needle retraction sleeve 2 is also provided with a wire passage for the capacitive sensing device, which makes the pipette wire more standardized and clean, and also protects the wire.

[0063] During implementation, under the control of the actuator 5, the swinging member 4 moves the auxiliary action member 8 downward. The auxiliary action member 8 drives the needle retraction sleeve 2 to move downward along the gun head rod 1. The needle retraction sleeve 2 pushes the used gun head downward to complete the gun head retraction action. Then, the actuator 5 reverses its operation, and the swinging member 4 drives the auxiliary action member 8 and the needle retraction sleeve 2 to move upward along the gun head rod 1. The needle retraction sleeve 2 returns to its original position under the action of the auxiliary action member 8 to facilitate the installation of the next gun head.

[0064] Example 2

[0065] Another embodiment of this application provides a pipette tip ejection mechanism, such as... Figures 3-7 As shown, it includes: a needle withdrawal sleeve 2 sleeved on the tip rod 1 of the pipette body 11, the needle withdrawal sleeve 2 sliding on the tip rod 1; it should be noted that the pipette body 11 includes a base 13, the tip rod 1 is connected to the base 13, one end of the tip rod 1 is connected to a pipette tip, the other end of the tip rod 1 is connected to a pipette, one end of the tip rod 1 is detachably connected to a pipette tip for aspiration and dispensing liquid; a channel is formed inside the tip rod 1; the other end of the tip rod 1 is connected to a pipette. The structure and working principle of this pipette body 11 are existing technologies and will not be described in detail; a protrusion 21 is formed on the needle withdrawal sleeve 2;

[0066] A swing member 4 is rotatably connected to the base 13 of the pipette body 11. For example, the middle part of the swing member 4 is rotatably connected to the base 13 of the pipette body 11. The two ends of the swing member 4 form a lever structure with the middle part as the fulcrum. There is a gap between the end of the swing member 4 near the needle withdrawal sleeve 2 and the top of the protrusion 21, so that when the pipette tip is installed with the pipette tip rod 1, it can push the needle withdrawal sleeve 2 upwards, facilitating the installation of the pipette tip. If the swing member 4 is close to the needle withdrawal sleeve... One end of tube 2 abuts against protrusion 21. When the gun head and gun head rod 1 are installed, the lack of travel clearance makes it difficult to install the gun head in place. The actuator 5 drives the swing member 4 to press down on protrusion 21 at the end away from the needle retraction sleeve 2, so that the needle retraction sleeve 2 retracts the gun head. Alternatively, the actuator 5 drives the swing member 4 to tilt up relative to protrusion 21 at the end away from the needle retraction sleeve 2, so that the needle retraction sleeve 2 moves away from the gun head, which facilitates the installation of the gun head and gun head rod 1.

[0067] The execution part 5 is connected to the base 13 of the pipette body 11; the output end of the execution part 5 is connected to the other end of the swing part 4; as an example, the execution part 5 is a motor, which is prior art and will not be described here; the execution part 5 works to drive the other end of the swing part 4 to move up or down with the middle part of the swing part 4 as the fulcrum, so as to drive the one end of the swing part 4 to press down on the convex block 21 or move away from the convex block 21, so as to realize the action of the end of the needle withdrawal sleeve 2 pressing down on the gun head on the gun head rod 1 or moving away from the gun head.

[0068] The sleeve connecting part 6 is further included, which comprises a guide part 61 movably penetrating the base 13 of the pipette body 11; the lower end of the guide part 61 is detachably connected to the needle withdrawal sleeve 2; it should be noted that in this process, the upper part of the guide part 61 is limited relative to the base 13, so that the guide part 61 can be clamped on the base 13, and the needle withdrawal sleeve 2 will not directly slide down along the gun head rod 1.

[0069] As a further description, in the embodiment, as shown in Figures 3-7 the lower end of the guide part 61 is connected to the convex block 21 on the needle withdrawal sleeve 2 by a bolt; the base 13 of the pipette body 11 is provided with a first mounting hole 12, the guide part 61 movably penetrates the first mounting hole 12, the guide part 61 is provided with an elastic part 62, the elastic part 62 is a spring, and the elastic part 62 is located in the first mounting hole 12; the base 13 of the pipette body 11 is provided with a sensing switch 63, and the guide part 61 is used in cooperation with the sensing switch 63; when the guide part 61 touches the sensing switch 63, the sensing switch 63 transmits an induction signal to the controller; the sensing switch 63 is used to sense whether the guide part 61 is returned to the position, so as to prevent the needle withdrawal sleeve 2 from being in the unreturned state, which affects the operation of inserting the gun head into the gun head rod 1; it should be noted that the structure and working principle of the sensing switch 63 are both prior art and will not be described here.

[0070] In the embodiment, as shown in Figure 6 and Figure 7 the elastic part 62 penetrates the guide part 61; in the normal state, the elastic part 62 makes the needle withdrawal sleeve 2 be at a position of a preset height on the gun head rod 1, so that the guide part 31 for the gun head on the gun head rod 1 is not completely blocked by the needle withdrawal sleeve 2; in order to ensure that the connection part of the gun head rod 1 and the gun head is partially exposed, the installation of the gun head is facilitated.

[0071] Further, in normal state, the elastic member 62 is in preset tension or preset compression state, preferably, the elastic member 62 is in preset compression state, the elastic member 62 in compression state makes the needle withdrawing sleeve 2 in preset height position on the gun head rod 1; when the swing member 4 presses the protrusion 21 on the needle withdrawing sleeve 2, the guide member 61 connected with the protrusion 21 follows the action, the guide member 61 compresses the elastic member 62, when the elastic member 62 moves to compression limit state, the execution part 5 stops action at this time, it should be explained that when the elastic member 62 moves to compression limit state, the elastic member 62 uses inductor to cooperate with the execution part 5, which will not be described here.

[0072] In addition, when the execution part 5 reverses action, the compressed elastic member 62 has certain elastic force, which plays a lifting role on the guide member 61.

[0073] As a further illustration, in the embodiment, as shown in Figure 3 and Figure 8 It also includes a connecting part 7, the execution part 5 is connected with the swing member 4 through the connecting part 7, which makes the connection more convenient; the connecting part 7 includes a connecting block 71 which is slidably connected on the swing member 4, it should be explained that the connecting block 71 is connected on the swing member 4 by sliding mode, such as sliding groove; the output end of the execution part 5 is connected with the connecting block 71, the output end of the execution part 5 is threadedly connected with the connecting block 71, the connecting block 71 is connected with a connecting rod 72, the connecting rod 72 is connected with the swing movable part 41 on the swing member 4,

[0074] As an example, the swing movable part 41 is a sliding groove arranged in the swing member 4, when the swing movable part 41 is a sliding groove, the connecting rod 72 and the sliding groove constitute sliding connection; in the embodiment, the execution part 5 is a forward and reverse motor, the output end of the execution part 5 is threadedly connected with the connecting block 71, through the forward or reverse work of the execution part 5, the connecting rod 72 is driven to move upward or downward on the swing movable part 41 of the swing member 4; or when the execution part 5 is a lifting motor or a lifting cylinder, the output end of the execution part 5 is detachably connected with the connecting block 71, through the forward or reverse work of the execution part 5, the connecting rod 72 is driven to move upward or downward on the swing movable part 41 of the swing member 4.

[0075] As a specific illustration, in the embodiment, as shown in Figures 4-7 and Figure 9As shown, the auxiliary action piece 8 is rotatably connected to one end of the swing piece 4, and the second mounting hole 81 is arranged on the auxiliary action piece 8. The auxiliary action piece 8 is rotatably connected to the swing piece 4 through the second mounting hole 81 and the cooperation with the pin shaft. The swing piece 4 can achieve a larger action expansion space on the needle withdrawal sleeve 2 through the auxiliary action piece 8, which is convenient for the layout of the overall space. The bottom of the auxiliary action piece 8 and the top of the protrusion 21 on the needle withdrawal sleeve 2 have a spacing, so that the gun head can be lifted upward when the gun head is installed with the gun head rod 1, which is convenient for the installation of the gun head. If the end of the swing piece 4 close to the needle withdrawal sleeve 2 abuts against the protrusion 21, there is no spacing travel to give way when the gun head is installed with the gun head rod 1, so that the gun head is not easy to install in place. The execution part 5 drives the end of the swing piece 4 away from the needle withdrawal sleeve 2 to press down the protrusion 21, so that the needle withdrawal sleeve 2 performs the gun withdrawal action on the gun head, or the execution part 5 drives the end of the swing piece 4 away from the needle withdrawal sleeve 2 to be raised relative to the protrusion 21, so that the needle withdrawal sleeve 2 is away from the gun head, which is convenient for the installation of the gun head and the gun head rod 1.

[0076] In the embodiment, as shown in Figure 3 and Figures 9-13 As shown, the auxiliary action piece 8 is rotatably connected to one end of the swing piece 4, and the second mounting hole 81 is arranged on the auxiliary action piece 8. The auxiliary action piece 8 is rotatably connected to the swing piece 4 through the second mounting hole 81 and the cooperation with the pin shaft. The swing piece 4 can achieve a larger action expansion space on the needle withdrawal sleeve 2 through the auxiliary action piece 8, which is convenient for the layout of the overall space. The bottom of the auxiliary action piece 8 and the top of the protrusion 21 on the needle withdrawal sleeve 2 have a spacing, so that the gun head can be lifted upward when the gun head is installed with the gun head rod 1, which is convenient for the installation of the gun head. If the end of the swing piece 4 close to the needle withdrawal sleeve 2 abuts against the protrusion 21, there is no spacing travel to give way when the gun head is installed with the gun head rod 1, so that the gun head is not easy to install in place. The execution part 5 drives the end of the swing piece 4 away from the needle withdrawal sleeve 2 to press down the protrusion 21, so that the needle withdrawal sleeve 2 performs the gun withdrawal action on the gun head, or the execution part 5 drives the end of the swing piece 4 away from the needle withdrawal sleeve 2 to be raised relative to the protrusion 21, so that the needle withdrawal sleeve 2 is away from the gun head, which is convenient for the installation of the gun head and the gun head rod 1.

[0077] or when the auxiliary action piece 8 is slidingly connected to one end of the swing piece 4, the sliding connection is similar to the sliding connection between the connecting rod 72 and the swing active part 41, for example, a sliding groove is arranged on one end of the swing piece 4, and a connecting rod is connected to the auxiliary action piece 8, and the connecting rod is slidingly connected with the sliding groove; as motion compensation, the base 13 or the pipette body 11 is provided with a through hole 131 for the guide rod 9 to movably pass through, and the guide rod 9 movably passes through the through hole 131, and at this time, the guide rod 9 and the through hole 131 are slidingly connected for guiding the auxiliary action piece 8. Because the auxiliary action piece 8 is rotationally connected with the guide rod 9, the guide rod 9 makes the auxiliary action piece 8 retreat during the action.

[0078] In the embodiment, the relative displacement between the connecting block 71 and the swing piece 4 is generated, and under the action of the output end of the execution part 5, the connecting block 71 can move upward or downward in the vertical direction. When the middle part of the swing piece 4 rotates around the base 13, the motion track of any point on the swing piece 4 except the rotation point of the middle part of the swing piece 4 should be a circular arc around the middle part of the swing piece 4, and at this time, the sliding connection point between the connecting block 71 and the swing piece 4 will not interfere with the motion. Conversely, when the auxiliary action piece 8 is slidingly connected to one end of the swing piece 4 through the sliding connection between the connecting rod 72 and the swing active part 41, the motion interference will not be generated.

[0079] In the embodiment, the retreat needle sleeve 2 is also provided with a wire passing channel for a capacitive sensing device, so that the pipette wire is more standardized and clean, and the wire is also protected.

[0080] In the implementation, the swing piece 4 moves downward under the control of the execution part 5, and the auxiliary action piece 8 moves downward along the gun head rod 1 through the auxiliary action piece 8, so that the retreat needle sleeve 2 pushes the used gun head downward to complete the retreat gun head action. Then, the execution part 5 reverses the work, the swing piece 4 drives the auxiliary action piece 8 to move upward, and the retreat needle sleeve 2 is reset upward along the gun head rod 1 under the action of the sleeve connecting part 6 to facilitate the installation of the next gun head.

[0081] As further illustration, as shown in Figure 12 The sensing unit 64 is connected to the base 13 or the pipette body 11, and the sensing unit 4 is arranged on the embodiment 1 and the embodiment 2. The sensing unit 64 includes but is not limited to a photoelectric sensing switch, and the upper end of the guide rod 9 is used in cooperation with the sensing unit 64. When the upper end of the guide rod 9 is in the highest position, the guide rod 9 is perpendicular to the horizontal plane, the guide rod 9 triggers the sensing unit 64 to respond, the sensing unit 64 transmits the position state signal of the guide rod 9 to the controller, and the controller controls the execution part 5 to stop the action to prevent the excessive torque of the execution part 5. It should be noted that the structure and working principle of the sensing unit 64 are prior art, and will not be described in detail.

[0082] Another embodiment of the present application is a pipette comprising a gun head retracting mechanism of the pipette as described above.

[0083] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects: 1. The lever principle is used for the gun head retracting action, avoiding the increase of the pipette cavity space and the design of the needle retracting plate, improving the pipette precision and the overall layout space rationality;

[0084] 2. The elastic member allows the needle retracting sleeve to be at a preset height on the gun head rod, so that the guide part for the gun head on the gun head rod is not completely blocked by the needle retracting sleeve, in order to ensure that the connection part of the gun head rod and the gun head is partially exposed, facilitating the installation of the gun head;

[0085] 3. The design of the wiring channel plays a role in avoiding the exposure of the capacitor wiring;

[0086] 4. The design of the auxiliary action member makes the power stroke of the execution part short, saving cost;

[0087] 5. The design of the sleeve connecting part and the induction switch senses whether the gun head is installed in place, and also ensures the return of the needle retracting sleeve, so that the gun head can be inserted onto the gun head rod.

[0088] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0089] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the various embodiments are not intended to limit the scope of the present application unless otherwise specifically stated. It will be further understood that the dimensions of the various parts shown in the drawings are not drawn to scale for the sake of convenience. Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail herein. However, in appropriate cases, techniques, methods, and devices should be considered as part of the specification. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Thus, other examples of the example embodiments can have different values. It should be noted that like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0090] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship is generally based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the device or element indicated must have a particular orientation or be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application; The orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0091] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0092] In addition, it should be noted that the use of "first", "second" and the like to define parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore it cannot be understood as a limitation on the scope of protection of the present application.

[0093] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "connected" and the like should be understood in a broad sense, for example, "connected" can be fixedly connected, or can be detachably connected, or integrally connected; It can be mechanical connection, or electrical connection; It can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0094] The above is only the preferred embodiment of the present application, any change and modification made within the scope of the present application should be included in the scope of the present application.

Claims

1. A pipette tip ejection mechanism, characterized in that, It includes: a needle withdrawal sleeve (2) fitted on the pipette tip rod (1) of the pipette body (11), the needle withdrawal sleeve (2) sliding on the pipette tip rod (1); The swinging component (4) is rotatably connected to the base (13) of the pipette body (11); the middle part of the swinging component (4) is rotatably connected to the base (13) of the pipette body (11); the two ends of the swinging component (4) form a lever structure with the middle part as the fulcrum; the end of the swinging component (4) near the needle withdrawal sleeve (2) is connected to the top of the needle withdrawal sleeve (2); The actuator (5) is connected to the base (13) of the pipette body (11); the output end of the actuator (5) is connected to the other end of the swing member (4); the actuator (5) drives the swing member (4) away from the end of the needle withdrawal sleeve (2) to press down on the needle withdrawal sleeve (2), or the actuator (5) drives the needle withdrawal sleeve (2) to slide upward along the pipette tip rod (1) through the swing member (4); It also includes an auxiliary action component (8), on which a guide rod (9) is connected. When the auxiliary action component (8) is rotatably connected to one end of the swing component (4), the base (13) or the pipette body (11) is provided with a through hole (131) for the guide rod (9) to move through. The guide rod (9) moves through the through hole (131). The size of the through hole (131) is larger than the diameter of the guide rod (9). Under the action of external force, the guide rod (9) can move in the through hole (131). Or when the auxiliary action member (8) is slidably connected to one end of the swing member (4), the auxiliary action member (8) is connected to a guide rod (9), and the base (13) or pipette body (11) is provided with a through hole (131) for the guide rod (9) to pass through, and the guide rod (9) passes through the through hole (131).

2. A pipette tip ejection mechanism, characterized in that, It includes: a needle withdrawal sleeve (2) fitted on the pipette tip rod (1) of the pipette body (11), the needle withdrawal sleeve (2) sliding on the pipette tip rod (1); The swinging component (4) is rotatably connected to the base (13) of the pipette body (11); the middle part of the swinging component (4) is rotatably connected to the base (13) of the pipette body (11); the two ends of the swinging component (4) form a lever structure with the middle part as the fulcrum; there is a gap between the end of the swinging component (4) near the needle withdrawal sleeve (2) and the top of the needle withdrawal sleeve (2); An actuator (5) is connected to the base (13) of the pipette body (11); the output end of the actuator (5) is connected to the other end of the swing member (4); the actuator (5) drives the swing member (4) away from the needle withdrawal sleeve (2) to press down on the needle withdrawal sleeve (2), or the actuator (5) tilts relative to the needle withdrawal sleeve (2) through the end of the swing member (4) away from the needle withdrawal sleeve (2); The cannula connection part (6) includes a guide (61), which is movably inserted into the base (13) of the pipette body (11); the lower end of the guide (61) is detachably connected to the needle withdrawal cannula (2). It also includes an auxiliary action component (8), on which a guide rod (9) is connected. When the auxiliary action component (8) is rotatably connected to one end of the swing component (4), the base (13) or the pipette body (11) is provided with a through hole (131) for the guide rod (9) to move through. The guide rod (9) moves through the through hole (131). The size of the through hole (131) is larger than the diameter of the guide rod (9). Under the action of external force, the guide rod (9) can move in the through hole (131). Or when the auxiliary action member (8) is slidably connected to one end of the swing member (4), the auxiliary action member (8) is connected to a guide rod (9), and the base (13) or pipette body (11) is provided with a through hole (131) for the guide rod (9) to pass through, and the guide rod (9) passes through the through hole (131).

3. The pipette tip ejection mechanism as described in claim 2, characterized in that, A protrusion (21) is formed on the needle ejector sleeve (2); there is a gap between the end of the swing member (4) near the needle ejector sleeve (2) and the top of the protrusion (21); the actuator (5) drives the end of the swing member (4) away from the needle ejector sleeve (2) to press down on the protrusion (21), or the actuator (5) tilts relative to the protrusion (21) through the end of the swing member (4) away from the needle ejector sleeve (2); One end of the guide (61) is detachably connected to the protrusion (21) on the needle withdrawal sleeve (2); The base (13) of the pipette body (11) is provided with a first mounting hole (12), the guide (61) is movably inserted into the first mounting hole (12), the guide (61) is provided with an elastic element (62), and the elastic element (62) is located in the first mounting hole (12).

4. The pipette tip ejection mechanism as described in claim 3, characterized in that, It also includes a sensor switch (63), which is connected to the base (13) of the pipette body (11), and the guide (61) is used in conjunction with the sensor switch (63).

5. The pipette tip ejection mechanism of any one of claims 1-4, characterized in that, It also includes a connecting part (7), the execution part (5) is connected to the swing member (4) through the connecting part (7); the connecting part (7) includes a connecting block (71) slidably connected to the swing member (4), and the output end of the execution part (5) is connected to the connecting block (71).

6. The pipette tip ejection mechanism as described in claim 5, characterized in that, A connecting rod (72) is connected to the connecting block (71), and the connecting rod (72) is movably connected to the swinging movable part (41) on the swinging member (4).

7. The pipette tip ejection mechanism of any one of claims 1-4, characterized in that, The needle-removal sleeve (2) is also provided with a wiring channel.

8. The pipette tip ejection mechanism as described in claim 3, characterized in that, The elastic element (62) is inserted on the guide element (61). Under normal conditions, the elastic element (62) keeps the needle-retracting sleeve (2) at a preset height on the gun head rod (1).

9. The pipette tip ejection mechanism as described in claim 1 or 2, characterized in that, It also includes a sensing unit (64) which is connected to the base (13) or the pipette body (11); the guide rod (9) is used in conjunction with the sensing unit (64).

10. A pipette, characterized in that, Includes the pipette tip ejection mechanism of any one of claims 1-9.

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