Piston auto-clamping device and pipette comprising same

Abstract

This invention provides an automatic piston gripping device and a pipette including the same. The automatic piston gripping device includes a gripping mechanism, a fixed sleeve, a first spring, and a piston. The gripping mechanism is installed inside the fixed sleeve, and the first spring is sleeved outside the gripping mechanism, located between the gripping mechanism and the fixed sleeve. The piston is inserted through one end of the fixed sleeve, opposite the gripper of the gripping mechanism. The head of the gripper is provided with a locking ring, and the outer end of the fixed sleeve is provided with a first limiting part for positioning the locking ring. When the locking ring moves to the first limiting part, the gripper extends out from inside the locking ring and automatically grips the piston. This invention can quickly and adaptively grip the piston and can generate an audible signal during the gripping process to indicate successful gripping to the customer, thereby avoiding customer misoperation.

Description

Technical Field

[0001] This invention relates to the field of liquid handling systems, and particularly to an automatic piston gripping device and a pipette including the same. Background Technology

[0002] In existing technology, the piston clamping mechanism consists of a sleeve, a limiting component, a spring, and a clamp. Related products can be used in scientific and industrial laboratories in fields such as medicine, pharmaceuticals, and molecular biology.

[0003] We typically use a clamp, sleeve, and spring to form the gripping mechanism. The gripping mechanism holds the piston, and the up-and-down movement of the gripping mechanism enables the pipette to perform its aspiration and dispensing functions.

[0004] However, using the aforementioned mechanism to grip the piston requires pre-operation from the user, expending considerable effort to open the chuck before loading the piston. This is inconvenient, time-consuming, and labor-intensive. Furthermore, the piston is easily damaged during loading. Existing systems suffer from laborious, inconvenient, and difficult-to-observe gripping success, and are also prone to piston damage.

[0005] In view of this, the inventors of this application have designed an automatic piston gripping device and a pipette including the same, in order to overcome the above-mentioned technical problems. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the defects of the prior art, such as inconvenient operation, time and labor, and easy damage to the piston, and to provide an automatic piston gripping device and a pipette including the same.

[0007] The present invention solves the above-mentioned technical problems through the following technical solution:

[0008] An automatic piston clamping device is characterized in that the automatic piston clamping device includes a clamping mechanism, a fixed sleeve, a first spring and a piston, the clamping mechanism is installed inside the fixed sleeve, and the first spring is sleeved outside the clamping mechanism and located between the clamping mechanism and the fixed sleeve.

[0009] The piston is inserted from one end of the fixed sleeve and is opposite to the clamp of the clamping mechanism. The head of the clamp is provided with a locking ring, and the outer end of the fixed sleeve is provided with a first limiting part for positioning the locking ring. When the locking ring moves to the first limiting part, the clamp extends out from the locking ring and automatically clamps the piston.

[0010] According to one embodiment of the present invention, the clamping mechanism further includes an adapter seat, a sleeve, and a second spring. The adapter seat is installed inside the sleeve, the clamp is installed at one end of the adapter seat, and the second spring is sleeved on the adapter seat and located between the adapter seat and the sleeve.

[0011] According to one embodiment of the present invention, the locking ring is sleeved on the head of the clamp.

[0012] According to one embodiment of the present invention, the head of the chuck has a petal-shaped structure.

[0013] According to one embodiment of the present invention, the diameter of the internal clamping hole of the chuck matches the diameter of the root rod of the piston.

[0014] According to one embodiment of the present invention, a second limiting part is provided on the inner wall surface of the fixed sleeve, and a third limiting part is provided on the outer wall surface of the sleeve, and the two ends of the first spring abut against the second limiting part and the third limiting part respectively.

[0015] According to one embodiment of the present invention, a fourth limiting part is further provided on the inner wall surface of the sleeve, and the end of the second spring abuts against the fourth limiting part.

[0016] According to one embodiment of the present invention, the chuck includes three jaws arranged in a ring.

[0017] According to one embodiment of the present invention, the end of the claw is an arc-shaped sheet structure.

[0018] The present invention also provides a pipette, characterized in that the pipette includes the piston automatic gripping device as described above.

[0019] The positive and progressive effects of this invention are as follows:

[0020] The present invention provides an automatic piston gripping device and a pipette including the device, which can quickly and adaptively grip the piston, thereby solving the problem of complex piston gripping operations in existing products / technologies.

[0021] It can produce a sound during the piston clamping process to indicate to the customer that the clamping is successful, thereby avoiding customer misoperation. Attached Figure Description

[0022] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, in which the same reference numerals always denote the same features, wherein:

[0023] Figure 1 This is a schematic diagram of the clamping mechanism in the automatic piston clamping device of the present invention.

[0024] Figure 2 This is a schematic diagram of the automatic piston clamping device of the present invention.

[0025] Figure 3 This is a schematic diagram of the piston clamping structure of the automatic piston clamping device of the present invention.

[0026] [Attached image labels]

[0027] Clamping mechanism 10

[0028] Fixed sleeve 20

[0029] First spring 30

[0030] Piston 40

[0031] 11 chucks

[0032] Locking ring 12

[0033] First limiting part 21

[0034] 13-seater adapter

[0035] Sleeve 14

[0036] Second spring 15

[0037] Second limiting part 22

[0038] Third limiting part 141

[0039] Fourth limiting part 142

[0040] Card Claw 111 Detailed Implementation

[0041] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0042] Embodiments of the invention will now be described in detail with reference to the accompanying drawings. Preferred embodiments of the invention will now be described in detail, examples of which are shown in the drawings. Wherever possible, the same reference numerals will be used in all the drawings to denote the same or similar parts.

[0043] Furthermore, although the terminology used in this invention is selected from commonly known and used terms, some terms mentioned in this specification may have been selected by the applicant in his or her judgment, and their detailed meanings are explained in the relevant sections of the description herein.

[0044] Furthermore, the invention should be understood not only through the actual terminology used, but also through the meaning implied by each term.

[0045] Figure 1 This is a schematic diagram of the clamping mechanism in the automatic piston clamping device of the present invention. Figure 2 This is a schematic diagram of the automatic piston clamping device of the present invention. Figure 3 This is a schematic diagram of the piston clamping structure of the automatic piston clamping device of the present invention.

[0046] like Figure 1 and Figure 3 As shown, the present invention provides an automatic piston clamping device, which includes a clamping mechanism 10, a fixed sleeve 20, a first spring 30, and a piston 40. The clamping mechanism 10 is installed inside the fixed sleeve 20, and the first spring 30 is sleeved outside the clamping mechanism 10, located between the clamping mechanism 10 and the fixed sleeve 20.

[0047] The piston 40 is inserted from one end of the fixed sleeve 20 and is opposite to the chuck 11 of the clamping mechanism 10. The head of the chuck 11 is provided with a locking ring 12. The outer end of the fixed sleeve 20 is provided with a first limiting part 21 for positioning the locking ring 12. When the locking ring 12 moves to the first limiting part 21, the chuck 11 extends out from the locking ring 12 and automatically clamps the piston 40.

[0048] Preferably, the clamping mechanism 10 further includes an adapter seat 13, a sleeve 14, and a second spring 15. The adapter seat 13 is installed inside the sleeve 14, the clamp 11 is installed at one end of the adapter seat 13, and the second spring 15 is sleeved on the adapter seat 13 and located between the adapter seat 13 and the sleeve 14.

[0049] The locking ring 12 is preferably sleeved on the head of the chuck 11. The head of the chuck 11 has a petal-shaped structure. The diameter of the internal clamping hole of the chuck 11 matches the diameter of the root rod of the piston 40.

[0050] Furthermore, a second limiting part 22 is provided on the inner wall surface of the fixed sleeve 20, and a third limiting part 141 is provided on the outer wall surface of the sleeve 14. The two ends of the first spring 30 abut against the second limiting part 22 and the third limiting part 141 respectively.

[0051] Preferably, a fourth limiting part 142 is also provided on the inner wall surface of the sleeve 14, so that the end of the second spring 15 abuts against the fourth limiting part 142.

[0052] More preferably, the chuck 11 includes three jaws 111 arranged in a ring. The ends of the jaws 111 have an arc-shaped plate structure.

[0053] The present invention also provides a pipette that includes the piston automatic gripping device described above.

[0054] According to the above structural description, the automatic piston clamping device of the present invention has a clamping mechanism 10 installed in the fixed sleeve 20 at the lower end of the pipette. When the customer is performing an experimental operation, he first inserts the pipette into the tip box to load the tip. After the tip is loaded, he presses down on the pipette operating handle. After hearing the loading prompt sound "click", he releases the operating handle, and the clamping mechanism 10 automatically clamps the piston 40 in the tip. At this time, the customer can start performing daily pipetting operations.

[0055] After completing the experiment, the customer presses down on the operating handle to eject the suction head assembly. Once the suction head assembly has ejected, the customer releases the operating handle, and the gripping mechanism 10 returns to its initial position.

[0056] The working state of the automatic piston clamping device of the present invention is as follows:

[0057] The clamping mechanism is in its initial state: the spring inside the chuck mechanism is in a pre-warning state, with a spring force of N. The three jaws at the chuck head are in a tightened state. At this time, the dimension of the chuck end is the inner diameter of the locking ring.

[0058] When the first spring is compressed to its limit, the spring force within the chuck assembly gradually increases from N. The three jaws at the top of the chuck, no longer under the force of the chuck spring, begin to open slightly.

[0059] When the locking ring reaches the bottom of the fixed sleeve: the three jaws of the chuck gradually open to the inner wall of the locking ring, and the diameter of the internal clamping hole of the chuck matches the diameter of the piston root rod.

[0060] The chuck disengages from the locking ring and reaches a position flush with the bottom of the fixed sleeve. The chuck continues to advance, while the locking ring remains at the bottom of the fixed sleeve. At this point, the dimensions of the chuck end are equal to the inner diameter of the locking ring and the outer diameter of the chuck head.

[0061] The chuck is completely disengaged from the locking ring: The chuck continues to move forward away from the bottom of the fixed sleeve handle. At this time, the locking ring is affected by the unfolding elastic force of the chuck's jaws, and the locking ring begins to move backward away from the bottom of the fixed sleeve handle, producing an impact sound.

[0062] At this point, the size of the chuck end is the outer diameter when the jaws are fully open.

[0063] Exiting the suction head position: The chuck continues to move forward and leaves the bottom of the fixed sleeve. At this time, the chuck pushes out of the piston end face and ejects the suction head and piston.

[0064] In summary, the automatic piston gripping device and the pipette including the present invention can quickly and adaptively grip the piston, thereby solving the problem of complex piston gripping operations in existing products / technologies.

[0065] It can produce a sound during the piston clamping process to indicate to the customer that the clamping is successful, thereby avoiding customer misoperation.

[0066] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A piston automatic gripping device characterized by comprising: The piston automatic gripping device includes a gripping mechanism, a fixed sleeve, a first spring, and a piston. The gripping mechanism is installed inside the fixed sleeve, and the first spring is sleeved outside the gripping mechanism and located between the gripping mechanism and the fixed sleeve. The piston is inserted from one end of the fixed sleeve and is opposite to the chuck of the clamping mechanism. The chuck includes three jaws arranged in a ring. The head of the chuck is provided with a locking ring, and the outer end of the fixed sleeve is provided with a first limiting part for positioning the locking ring. When the locking ring moves to the first limiting part, the chuck extends out from the locking ring and automatically clamps the piston. When the chuck is completely disengaged from the locking ring, the chuck continues to move forward away from the bottom of the fixed sleeve. The locking ring is affected by the unfolding elastic force of the chuck's claws and begins to move backward away from the bottom position of the fixed sleeve, while producing an impact sound. The clamping mechanism further includes an adapter seat, a sleeve, and a second spring. The adapter seat is installed inside the sleeve, the clamp is installed at one end of the adapter seat, and the second spring is sleeved on the adapter seat and located between the adapter seat and the sleeve. A second limiting part is provided on the inner wall surface of the fixed sleeve, and a third limiting part is provided on the outer wall surface of the sleeve. The two ends of the first spring abut against the second limiting part and the third limiting part, respectively. The first limiting part and the second limiting part are separated from each other.

2. The piston automatic gripping device according to claim 1, wherein The locking ring is fitted onto the head of the clamp.

3. The piston automatic gripping device according to claim 2, wherein The head of the clamp has a petal-shaped structure.

4. The piston automatic gripping device according to claim 1, wherein The diameter of the internal clamping hole of the chuck matches the diameter of the root rod of the piston.

5. The piston automatic gripping device according to claim 1, wherein A fourth limiting part is also provided on the inner wall surface of the sleeve, and the end of the second spring abuts against the fourth limiting part.

6. The automatic piston clamping device as described in claim 1, characterized in that, The end of the claw has an arc-shaped plate structure.

7. A pipette, characterized in that, The pipette includes the piston automatic gripping device as described in any one of claims 1-6.

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