Needle tube pipetting device and needle tube annular clamp

Abstract

The utility model discloses a needle tube pipetting device and a needle tube annular clamping hoop, the device comprises a needle tube part and a pipetting part, the needle tube part comprises a needle tube sleeve, a needle tube pushing part and an annular clamping hoop, the needle tube pushing part is located in the needle tube sleeve, and the annular clamping hoop can be fastened to the end, away from the needle head direction, of the needle tube sleeve; the liquid transferring part comprises a power part, a clamping assembly, a moving assembly and a propelling assembly, the clamping assembly is located on the lower portion of the liquid transferring part, the clamping assembly can grab, clamp and fix the annular clamping hoop, the propelling assembly is arranged in an inner cavity of the liquid transferring part, and the propelling assembly can push the moving assembly to move. According to the automatic pipetting device, the needle tube can be conveniently and stably grabbed, and liquid materials in the needle tube can be accurately and quantitatively extruded out.

Description

Technical Field

[0001] The present application relates to the field of liquid transfer devices, and in particular to a needle pipette liquid transfer device and a needle pipette annular clamp. Background Art

[0002] Automated liquid handling devices are widely used in scientific research, biopharmaceuticals, food production, and cosmetics manufacturing. Existing automated liquid handling devices often utilize a suction principle: negative pressure is generated within the pipetting chamber, which draws liquid material from the storage tank and then pushes it to the desired area. However, this method carries the risk of contamination in non-GMP operating environments, as the pipetting chamber can introduce contaminants into the storage tank. Summary of the Invention

[0003] In order to solve the problems existing in the prior art, the present application provides a needle tube pipetting device and a needle tube annular clamp.

[0004] The specific technical solutions of this application are as follows:

[0005] A needle pipetting device, wherein the device comprises a needle tube part and a pipetting part,

[0006] The needle tube part includes a needle tube sleeve, a needle tube propulsion part and an annular clamp.

[0007] The needle tube propulsion portion is located in the needle tube sleeve, and the annular clamp can be fastened to an end of the needle tube sleeve away from the needle tip;

[0008] The pipetting unit includes a power unit, a clamping component, a moving component, and a propulsion component.

[0009] The clamping assembly is located at the lower part of the pipetting part, and the clamping assembly can grasp and clamp the annular clamp.

[0010] The pipetting part has an inner cavity capable of accommodating the needle tube propulsion part of the needle tube part, the moving component and the propulsion component. The propulsion component can move the moving component under the action of the power part.

[0011] In a specific embodiment, the annular clamp can be fastened to a raised portion at one end of the needle sleeve away from the needle tip.

[0012] In a specific embodiment, the inner wall of the annular clamp has a groove, and the protrusion on the needle tube sleeve can be embedded in the groove on the inner wall of the annular clamp.

[0013] In a specific embodiment, the inner wall of the raised portion of the annular clamp away from the needle tube sleeve further has a protrusion, and the protrusion can be engaged with the needle tube propulsion portion to prevent the needle tube propulsion portion from shaking during the propulsion process.

[0014] In a specific embodiment, the inner wall of the raised portion of the annular clamp away from the needle tube sleeve further has a limiting protrusion, and the limiting protrusion can control the advancement distance of the needle tube advancement portion.

[0015] In a specific embodiment, the annular clamp is detachably connected to the needle tube sleeve.

[0016] In one embodiment, the outer wall of the annular clamp has a lock buckle for fixing the annular clamp to the needle tube sleeve or detaching the annular clamp from the needle tube sleeve. Specifically, the number of the lock buckle is at least one, for example, the number can be one, two, three, four, etc.

[0017] In a specific embodiment, the clamping assembly is a clamping claw structure.

[0018] In a specific embodiment, the propulsion assembly is a propulsion rod.

[0019] In a specific embodiment, the moving component is a slider or a slide.

[0020] In a specific embodiment, the propulsion assembly and the movement assembly are fixedly connected.

[0021] In a specific embodiment, the propulsion component reciprocates under the action of the power unit, thereby driving the moving component to move up and down in the inner cavity of the pipetting part.

[0022] In a specific embodiment, the moving assembly contacts the needle tube pushing portion, thereby causing the needle tube pushing portion to move up and down.

[0023] In one embodiment, the pipetting assembly further comprises a limiting portion, the limiting portion being arranged in the inner cavity of the pipetting assembly relative to the propulsion assembly, the limiting portion being used to ensure stable movement of the moving assembly. Furthermore, the limiting portion is used to ensure stable movement of the moving assembly along an extension direction of the limiting portion.

[0024] In a specific embodiment, the pipetting unit further comprises a support frame, and the power unit, the clamping assembly and / or the propulsion assembly are all fixed on the support frame.

[0025] The present application also provides a needle tube annular clamp, wherein the inner wall of the annular clamp has a groove, and the raised portion on the needle tube sleeve can be embedded in the groove on the inner wall of the annular clamp; the inner wall of the annular clamp away from the raised portion of the needle tube sleeve also has a protrusion, and the protrusion can be embedded with the needle tube propulsion portion, thereby preventing the needle tube propulsion portion from shaking during the propulsion process.

[0026] In a specific embodiment, the inner wall of the raised portion of the annular clamp away from the needle tube sleeve further has a limiting protrusion, and the limiting protrusion can control the advancement distance of the needle tube advancement portion.

[0027] Beneficial effects

[0028] The needle pipetting device provided in the present application can enable the pipetting part to grasp the needle pipe more stably by providing an annular clamp on the needle pipe;

[0029] Furthermore, more precise quantitative extrusion of the liquid material in the syringe can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is an overall schematic diagram of the needle pipette device of the present application;

[0031] Figure 2 yes Figure 1 A partial enlarged view of part A;

[0032] Figure 3 This is a diagram showing the connection structure of a needle tube and an annular clamp in one embodiment of the present application;

[0033] Figure 4 This is a structural diagram of a pipetting unit in one embodiment of the present application;

[0034] Figure 5 It is a structural diagram of the clamp in this application.

[0035] In the figure, 1. needle tube part; 11. needle tube sleeve; 12. needle tube propulsion part; 13. annular clamp; 2. pipetting part; 21. clamping assembly; 22. moving assembly; 23. propulsion assembly; 3. power part; 4. limiting part; 5. bracket frame; 6. protrusion. DETAILED DESCRIPTION

[0036] The present application is described in detail below. Although specific embodiments of the present application are shown, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0037] It should be noted that certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that technicians may use different nouns to refer to the same component. This specification and claims do not use the difference in nouns as a way to distinguish components, but use the difference in the functions of the components as the criterion for distinction. As mentioned throughout the specification and claims, "including" or "comprising" are open-ended terms and should be interpreted as "including but not limited to". The subsequent description of the specification is a preferred embodiment of the present application, but the description is based on the general principles of the specification and is not intended to limit the scope of the present application. The scope of protection of this application shall be as defined by the attached claims.

[0038] refer to Figures 1 to 5 The present application provides a needle pipette device. The device comprises a needle tube part 1 and a pipette part 2.

[0039] Liquid is stored in the needle tube part 1, and the pipetting part 2 can push the needle tube part 1 to squeeze out the liquid in the needle tube part 1. In addition, the pipetting part 2 can also control the discharge amount of the liquid in the needle tube part 1 by controlling the operation process.

[0040] refer to Figure 3 The needle tube part 1 includes a needle tube sleeve 11, a needle tube propulsion part 12 and an annular clamp 13.

[0041] The needle tube propulsion portion 12 is located in the needle tube sleeve 11 , and the annular clamp 13 is fastened to an end of the needle tube sleeve 11 away from the needle tip.

[0042] refer to Figure 3 The needle sleeve 11 is a hollow structure, and liquid can be stored inside the needle sleeve 11. The needle pusher 12 is located inside the needle sleeve 11 and is used to push the liquid inside the needle sleeve 11. At the same time, the needle pusher 12 can also seal the needle sleeve 11, so that the liquid in the needle sleeve 11 is sealed inside the needle sleeve 11.

[0043] At the same time, after the needle tube propulsion unit 12 pushes the liquid in the needle tube sleeve 11, the needle tube propulsion unit 12 stays at the target position, and the liquid in the needle tube sleeve 11 is also sealed by the needle tube propulsion unit 12 and does not leak out of the needle tube sleeve 11. Therefore, the liquid in the needle tube can be accurately removed by only controlling the position of the needle tube propulsion unit 12 in the needle tube sleeve 11.

[0044] refer to Figure 3 The annular clamp 13 is fastened to the rear end of the needle tube sleeve 11, thereby making the rear end of the needle tube sleeve 11 have a larger radial dimension, making it easier for the needle tube sleeve 11 to be fixed by the pipetting part 2. This reduces the possibility of the pipetting part 2 and the needle tube part 1 being separated.

[0045] refer to Figures 1 to 5 The pipetting unit 2 includes a power unit 3, a clamping component 21, a moving component 22, and a propulsion component 23.

[0046] The clamping assembly 21 is located at the lower part of the pipetting part 2. The clamping assembly 21 can grasp and clamp the annular clamp 13. The pipetting part 2 has an inner cavity that can accommodate the needle tube propulsion part 12 of the needle tube part 1, the moving assembly 22 and the propulsion assembly 23. The propulsion assembly 23 can move the moving assembly 22 under the action of the power part 3.

[0047] In a specific embodiment, the power unit 3 is a motor, and the motor is used to enable the propulsion assembly 23 to drive the moving assembly 22 to move up and down, thereby pushing the needle tube propulsion unit 12 to move up and down.

[0048] refer to Figure 5 The inner wall of the annular clamp 13 away from the raised portion of the needle tube sleeve 11 also has a protrusion 6, and the protrusion 6 can be engaged with the needle tube propulsion portion 12, thereby preventing the needle tube propulsion portion 12 from shaking during the propulsion process.

[0049] A protrusion 6 is formed on the inner wall of the annular clamp 13 extending toward the center, and the protrusion 6 forms a gap near the center that can accommodate the needle tube propulsion part 12. When the annular clamp 13 is clamped and fixed on the outside of the needle tube sleeve 11, the protrusion 6 will also abut and limit the needle tube propulsion part 12, so that when the needle tube propulsion part 12 moves inside the needle tube sleeve 11, it can move along the needle tube sleeve 11, reducing the possibility of the needle tube propulsion part 12 being offset.

[0050] The inner wall of the raised portion of the annular clamp 13 away from the needle tube sleeve 11 is further provided with a limiting protrusion, and the limiting protrusion can control the advancing distance of the needle tube propulsion portion 12, so that the feeding is more accurate.

[0051] The limiting protrusion extends toward the center from the inner wall of the annular clamp 13, and there is a certain distance between the limiting protrusion and the groove. When the needle tube propulsion part 12 is pushed in the needle tube sleeve 11 and the liquid in the needle tube sleeve 11 is squeezed out, the limiting protrusion can contact the tail end of the needle tube propulsion part 12, thereby limiting the advancement of the needle tube propulsion part 12, so that the pipetting part 2 can stop at the desired position when pushing the needle tube propulsion part 12, reducing the possibility of the pipetting part 2 causing damage to the needle tube propulsion part 12 or the needle tube sleeve 11.

[0052] refer to Figure 1 and Figure 4 The clamping assembly 21 is used to clamp the needle tube part 1 to fix the needle tube part 1. Then the moving assembly 22 and the propulsion assembly 23 are used to squeeze out the liquid in the needle tube sleeve 11.

[0053] When the clamping assembly 21 clamps the needle tube part 1 , it will clamp the larger annular clamp 13 , making it more convenient for the clamping assembly 21 to clamp the needle tube part 1 .

[0054] The moving assembly 22 is used to push the needle tube propulsion portion 12 of the needle tube portion 1 , and the propulsion assembly 23 is used to push the moving assembly 22 , so that the moving assembly 22 can push the needle tube propulsion portion 12 to move.

[0055] When the present application is in use, the clamping assembly 21 clamps the annular clamp 13 to keep the needle tube sleeve 11 fixed, and then the propulsion assembly 23 pushes the moving assembly 22, which in turn causes the moving assembly 22 to push the needle tube propulsion unit 12 to move, thereby discharging the liquid in the needle tube sleeve 11 out of the needle tube sleeve 11. The annular clamp 13 is used to fix the needle tube sleeve 11, thereby making it easier for the clamping assembly 21 to clamp and fix the needle tube unit 1. The moving assembly 22 and the propulsion assembly 23 are then used to push the needle tube propulsion unit 12, so that the needle tube propulsion unit 12 can accurately push out the liquid in the needle tube sleeve 11. In addition, when the annular clamp 13 clamps and fixes the needle tube sleeve 11, the limiting unit 4 can also limit the needle tube propulsion unit 12, so that the needle tube propulsion unit 12 can move along the inner wall of the needle tube sleeve 11, reducing the possibility of the needle tube propulsion unit 12 being offset.

[0056] refer to Figure 1 and Figure 3 The annular clamp 13 is fastened to the raised portion of the needle tube sleeve 11 at one end away from the needle tip.

[0057] When the liquid pipetting part 2 takes the liquid in the needle tube part 1, it pushes the needle tube propulsion part 12, thereby squeezing out the liquid in the needle tube sleeve 11. The needle tube propulsion part 12 is located in the direction of the needle tube sleeve 11 away from the needle head.

[0058] The annular clamp 13 is disposed at an end near the needle cannula pusher 12, so that when the clamping assembly 21 clamps and secures the needle cannula sleeve 11 and the annular clamp 13, it is close to the needle cannula pusher 12, thereby improving the stability of the needle cannula pusher 12 during movement. In addition, in the art, the needle cannula sleeve 11 has a raised portion on the end away from the needle. Securing the annular clamp 13 to the raised portion can improve the stability of the connection between the annular clamp 13 and the needle cannula sleeve 11 and reduce the possibility of the annular clamp 13 and the needle cannula sleeve 11 being separated.

[0059] refer to Figure 1 and Figure 3 The annular clamp 13 has a groove, and the depth of the groove is greater than the width of the protrusion.

[0060] The annular clamp 13 includes two mutually engaged clamping parts, and the two clamping parts are of the same structure. The two clamping parts are mutually engaged at opposite sides, thereby achieving mutual fixation of the clamping parts and also enabling the annular clamp 13 to be detachably connected to the needle tube sleeve 11.

[0061] In a specific embodiment, the interior of the annular clamp 13 is an I-shaped structure. The groove is a slot formed in the I-shaped structure.

[0062] refer to Figure 1 and Figure 3 When the annular clamp 13 is installed on the needle tube sleeve 11, the protrusion of the needle tube sleeve 11 will be clamped into the groove of the annular clamp 13. The annular clamp 13 and the needle tube sleeve 11 are embedded and clamped, thereby improving the connection strength between the needle tube sleeve 11 and the annular clamp 13.

[0063] The depth of the groove is set to be greater than the width of the raised portion on the needle tube sleeve 11. This allows the raised portion to be completely clamped into the groove. This reduces the possibility of misalignment between the annular clamp 13 and the needle tube sleeve 11. On the other hand, after the annular clamp 13 is clamped onto the needle tube sleeve 11, the inner wall of the annular clamp 13 can contact the outer wall of the needle tube sleeve 11, further improving the connection strength between the annular clamp 13 and the needle tube sleeve 11. At the same time, after the clamping assembly 21 clamps the annular clamp 13, the needle tube sleeve 11 has higher stability. This improves the pipetting accuracy of the pipette part 2 on the needle tube part 1.

[0064] Preferably, the upper portion of the groove further includes a limiting protrusion of the needle tube propulsion portion 22, which is used to define the propulsion end point of the propulsion assembly 22.

[0065] Preferably, the top surface of the annular clamp 13 is provided with a cross hole, and the cross hole matches the needle tube propulsion part, thereby facilitating the needle tube propulsion part to be more stable during the movement process and facilitating the pipetting accuracy.

[0066] refer to Figure 1 and Figure 3 The annular clamp 13 is detachably connected to the needle tube sleeve 11.

[0067] In one embodiment, the outer wall of the annular clamp 13 has a lock buckle for fixing the annular clamp 13 to the needle tube sleeve or detaching the annular clamp 13 from the needle tube sleeve. Specifically, the number of the lock buckle is at least one, for example, the number can be one, two, three, four, etc.

[0068] The annular clamp 13 is adapted to fit the clamping assembly 21. When the clamping assembly 21 clamps and secures the needle tube 1, the clamping assembly 21 clamps and secures the annular clamp 13. Therefore, the annular clamp 13 is detachably connected to the needle tube sleeve 11. When the liquid in the needle tube sleeve 11 is used up, the annular clamp 13 can be removed from the needle tube sleeve 11 and then installed on a new needle tube sleeve 11. The liquid in the new needle tube sleeve 11 can then be removed using the pipetting unit 2.

[0069] refer to Figure 1 and Figure 2 , the clamping assembly 21 is a clamping claw structure. Figure 2 This is a partially enlarged schematic diagram of the clamping claw structure in this application.

[0070] The clamping assembly 21 can clamp the annular clamp 13 , and when the liquid in the needle tube sleeve 11 is used up, the clamping assembly 21 needs to loosen the annular clamp 13 and replace the needle tube sleeve 11 with a new one.

[0071] The clamping claw structure enables the clamping assembly 21 to clamp the annular clamp 13 , and at the same time, the clamping claw can be moved to loosen the annular clamp 13 , thereby facilitating the replacement of the needle tube sleeve 11 .

[0072] refer to Figure 1 and Figure 2 Preferably, the clamping structure is connected to a spring, which is arranged on the clamping jaw of the clamping structure so that the clamping jaw can be switched and reset in a clamping or opening state.

[0073] refer to Figure 1 and Figure 4 , the propulsion component is a propulsion rod.

[0074] refer to Figure 1 , the moving component is a slide.

[0075] refer to Figure 4 , the moving component is a slider.

[0076] refer to Figure 1 and Figure 2 , the propulsion component 23 and the moving component 22 are fixedly connected.

[0077] The moving assembly 22 is connected to the needle tube propulsion unit 12 , and the moving assembly 22 can push the needle tube propulsion unit 12 to move, thereby the needle tube propulsion unit 12 squeezes out the liquid in the needle tube sleeve 11 .

[0078] The propulsion assembly 23 is used to push the moving assembly 22 and provide power to the moving assembly 22 , thereby squeezing out the liquid in the needle sleeve 11 .

[0079] On the other hand, the moving assembly 22 is used to connect the propulsion assembly 23 and the needle tube propulsion unit 12, thereby reducing the damage of the propulsion assembly 23 to the needle tube propulsion unit 12.

[0080] In a specific embodiment, the propulsion component 23 is a propulsion rod, and the moving component 22 is a slider.

[0081] The slider is in contact with the needle tube propulsion part 12 , and the propulsion rod is located on the side of the slider away from the needle tube propulsion part 12 . The propulsion rod pushes the slider to move, and then the slider pushes the needle tube propulsion part 12 to squeeze out the liquid in the needle tube sleeve 11 .

[0082] In one embodiment, the propulsion rod is a metal rod and the needle tube propulsion portion 12 is glass or plastic. A slider is used to separate the propulsion rod from the needle tube propulsion portion 12 to reduce the damage of the metal propulsion rod to the needle tube propulsion portion 12.

[0083] The pipetting assembly further includes a limiting portion 4 , which is disposed on the inner wall of the pipetting portion 2 opposite to the propulsion assembly 23 . The limiting portion 4 is used to enable the moving assembly 22 to move along an extending direction of the limiting portion 4 .

[0084] refer to Figure 1 and Figure 5 The limiter 4 is used to limit the push rod. Since the push rod reciprocates inside the pipetting unit 2, the push rod has a long stroke in the pipetting unit 2. When the push rod deviates in its radial direction, the slider will have a large deviation. Therefore, the limiter 4 is used to limit the push rod and also provides support for the movement of the push rod. When the push rod pushes the slider, the slider can move along the extension direction of the push rod, reducing the possibility of deviation between the slider and the needle tube pusher 12. This improves the accuracy of taking liquid from the needle tube sleeve 11.

[0085] In a specific embodiment, preferably, the limiting portion 4 is a limiting block.

[0086] refer to Figure 1 In one embodiment, the propulsion assembly is a propulsion rod, the moving assembly is a slide, and the limiting portion is a limit block. The limit block is fixed to the inner wall of the liquid transfer unit, and the propulsion rod is threadedly connected to the limit block; the propulsion assembly is fixedly connected to the moving block. When the motor drives the propulsion rod to rotate, the limit block fixed to the liquid transfer unit will drive the propulsion rod up and down under the action of the threads. The propulsion rod then pushes the moving block up and down.

[0087] refer to Figure 4In one embodiment, the propulsion assembly is a push rod, the moving assembly is a slider, and the limiting portion is a limiting rod. The limiting rod is arranged parallel to the propulsion rod and fixed to the pipetting unit. The propulsion rod is threadedly connected to the moving block, and the moving block is slidably connected to the limiting rod. The limiting rod is capable of limiting the rotation of the moving block; when the motor drives the propulsion rod to rotate, the moving block, driven by the threads of the propulsion rod, reciprocates up and down along the limiting rod.

[0088] refer to Figure 1 and Figure 4 In a specific embodiment, the power unit 3 is a motor, and the motor 3 is threadedly connected to the propulsion rod. When the motor 3 rotates, it will simultaneously drive the propulsion rod to move back and forth, and then the propulsion rod pushes the slider and the needle tube propulsion unit 12 to move.

[0089] When the motor 3 rotates in the reverse direction, the propulsion rod will return to its original position under the drive of the threaded connection, and then the propulsion rod and the slider can push the new needle tube sleeve 11 and the needle tube propulsion part 12.

[0090] The pipetting device further comprises a support frame 5 , and the power unit 3 , the clamping assembly 21 and / or the propulsion assembly 23 are all fixed on the support frame 5 .

[0091] When the liquid in the needle tube part 1 needs to be transferred to the target position, the clamping component 21 is first used to fix the needle tube sleeve 11, and then the moving component 22 and the propulsion component 23 are used to push the needle tube propulsion part 12, thereby squeezing the liquid in the needle tube sleeve 11 to the target position.

[0092] refer to Figure 1 The annular clamp 13 is clamped and fixed on the end of the needle sleeve 11 away from the needle. The moving component 22 abuts against the tail end of the needle propulsion part 12, and the moving component 22 can push the needle propulsion part 12 to achieve the transfer of the liquid inside the needle sleeve 11.

[0093] When the propulsion assembly 23 and the moving assembly 22 push the needle tube propulsion part 12 to move, the clamping assembly 21 fixes the needle tube sleeve 11, and then the moving assembly 22 abuts against the needle tube propulsion part 12. The motor 3 rotates to drive the propulsion assembly 23 to move, thereby moving the moving assembly 22. The moving assembly 22 pushes the needle tube propulsion part 12 to move, squeezing out the liquid in the needle tube sleeve 11.

[0094] The motor 3 is threadedly connected to the propulsion assembly 23. Rotation of the electrode drives the propulsion assembly 23 back and forth, thereby pushing the moving assembly 22 back and forth. A stopper located at the annular portion of the propulsion assembly 23 limits its movement. The stopper is fixed to the pipetting unit 2. This allows the slider to move along the extension of the propulsion rod, thereby pushing the needle propulsion unit 12.

[0095] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A needle pipetting device, characterized in that: The device comprises a needle tube part (1) and a liquid transfer part (2), The needle tube part (1) comprises a needle tube sleeve (11), a needle tube propulsion part (12) and an annular clamp (13). The needle tube propulsion portion (12) is located in the needle tube sleeve (11), and the annular clamp (13) can be fastened to an end of the needle tube sleeve (11) away from the needle tip. The pipetting unit (2) includes a power unit (3), a clamping component (21), a moving component (22), and a propulsion component (23). The clamping assembly (21) is located at the lower part of the pipetting part, and the clamping assembly (21) is capable of grabbing and clamping the annular clamp (13). The pipetting part (2) comprises an inner cavity capable of accommodating a needle tube propulsion part of the needle tube part (1), the moving component (22) and the propulsion component (23); the propulsion component (23) is capable of moving the moving component under the action of the power part (3).

2. The needle pipetting device according to claim 1, characterized in that: The annular clamp (13) can be fastened to a raised portion at one end of the needle sleeve away from the needle head.

3. The needle pipetting device according to claim 2, characterized in that: The inner wall of the annular clamp (13) has a groove, and the protrusion on the needle tube sleeve can be embedded in the groove on the inner wall of the annular clamp (13).

4. The needle pipetting device according to claim 2, characterized in that: The inner wall of the raised portion of the annular clamp (13) away from the needle tube sleeve is also provided with a protrusion, and the protrusion can be engaged with the needle tube propulsion portion, thereby preventing the needle tube propulsion portion from shaking during the propulsion process.

5. The needle pipetting device according to claim 2, characterized in that: The inner wall of the raised portion of the annular clamp (13) away from the needle tube sleeve is also provided with a limiting protrusion, and the limiting protrusion can control the distance of advancement of the needle tube advancement portion.

6. The needle pipetting device according to claim 1, characterized in that: The annular clamp (13) is detachably connected to the needle tube sleeve (11).

7. The needle pipetting device according to claim 1, characterized in that: The clamping assembly (21) is a clamping claw structure.

8. The needle pipetting device according to claim 1, characterized in that: The propulsion component (23) is a propulsion rod, and the moving component (22) is a slider or a slide.

9. The needle pipetting device according to claim 1, characterized in that: The pipetting part (2) further comprises a limiting part (4), wherein the limiting part (4) and the propulsion component (23) are arranged in the inner cavity of the pipetting part (2) relative to each other, and the limiting part is used to ensure stable movement of the moving component.

10. The needle pipetting device according to claim 1, characterized in that: The pipetting part (2) further comprises a support frame (5), and the power part (3), the clamping component (21) and / or the propulsion component (23) are all fixed on the support frame.

11. A needle tube annular clamp for clamping a needle tube, wherein the needle tube comprises a needle tube sleeve and a needle tube propulsion portion; characterized in that: The inner wall of the annular clamp (13) has a groove, and the raised portion on the needle tube sleeve can be embedded in the groove on the inner wall of the annular clamp (13); the inner wall of the annular clamp (13) away from the raised portion of the needle tube sleeve also has a protrusion, and the protrusion can be embedded with the needle tube propulsion portion (12), thereby preventing the needle tube propulsion portion from shaking during the propulsion process.

12. The needle tube annular clamp according to claim 11, characterized in that: The inner wall of the raised portion of the annular clamp (13) away from the needle tube sleeve is also provided with a limiting protrusion, and the limiting protrusion can control the distance of advancement of the needle tube advancement portion.

13. The needle tube annular clamp according to claim 11, characterized in that: The annular clamp (13) is detachably connected to the needle tube sleeve (11).

14. The needle tube annular clamp according to claim 13, characterized in that: The annular clamp (13) comprises two clamp parts that are clamped to each other, and the two clamp parts have the same structure.

15. The needle tube annular clamp according to claim 13, characterized in that: The outer wall of the annular clamp (13) has at least one lock buckle, which is used to fix the annular clamp (13) on the needle tube sleeve or detach it from the needle tube sleeve.

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