Pipette for molecular biology experiment

Abstract

The utility model relates to the technical field of pipettes, in particular to a pipette for molecular biology experiments, which comprises a pipette body, a liquid taking mechanism is arranged at the upper end of the pipette body, the liquid taking mechanism comprises a U-shaped cavity, a first moving block is arranged inside one end of the U-shaped cavity, and a second moving block is arranged inside the other end of the U-shaped cavity. And a first sealing ring is fixedly connected to the circumferential surface of the first moving block and is in sliding connection with the inner wall of the U-shaped cavity. Through the arrangement of the liquid taking mechanism, the whole liquid taking operation process only needs to pull a pressure increasing block and rotate a rotating rod, so that the liquid taking operation steps are greatly simplified, meanwhile, a second sealing ring can slowly and stably move under the mutual cooperation of a threaded rod and a threaded block, the liquid level can stably rise, and the liquid taking efficiency is improved. Therefore, the user can stably operate and control, and the operation difficulty of the user is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of pipettes, in particular to a pipette for molecular biological experiments. Background Art

[0002] A pipette is a measuring instrument used to accurately transfer a certain volume of solution. A pipette is a measuring instrument that is only used to measure the volume of the solution it releases. It is a thin glass tube with a bulge in the middle. Its lower end is pointed, and there is a mark on the neck of the upper end, which is a mark of the exact volume taken.

[0003] At present, the pipette in the prior art generally needs to be operated with an ear suction bulb. When the user needs to take liquid, first the lower end of the pipette is inserted into the solution, then the ear suction bulb is pressed, and then the use end of the pressed ear suction bulb is inserted into the upper end of the pipette, and finally the ear suction bulb is slowly released. Under the action of negative pressure, the solution enters the interior of the pipette, and the solution is sucked by releasing the pressed ear suction bulb by hand. Since the ear suction bulb is more sensitive to deformation, it is difficult to control the change of the ear suction bulb by hand, so that the solution is difficult to accurately reach the mark line, so the user needs to first suck the solution above the mark line Then move the ear bulb out from the upper end of the pipette, then quickly press the upper end of the pipette with your thumb, and finally slightly release your thumb to allow the solution level to slowly drop. When the solution drops to the mark, finally quickly press the upper end of the pipette. However, the entire liquid extraction operation process is relatively cumbersome. At the same time, the liquid level is controlled to accurately drop to the mark by loosening the hand. Since it cannot be smoothly controlled, the operation is difficult. Users can easily cause over-discharge due to improper control, resulting in the need to re-extract the liquid, which will greatly affect the user's work efficiency in taking the liquid. Utility Model Content

[0004] The utility model aims at the deficiencies in the prior art and provides the following technical solutions: a pipette for molecular biological experiments comprises a pipette body, a liquid taking mechanism is arranged at the upper end of the pipette body, the liquid taking mechanism comprises a U-shaped cavity, the upper end of the pipette body is arranged at the U-shaped cavity, a first moving block is arranged inside one end of the U-shaped cavity, a first sealing ring is fixedly connected to the circumferential surface of the first moving block, the first sealing ring is slidably connected to the inner wall of the U-shaped cavity, a first push rod is fixedly connected to the upper end of the first moving block, a pressure block is fixedly connected to the upper end of the first push rod, the U-shaped cavity An air pressure hole is provided on the surface of the body, a sealing plug is provided inside the air pressure hole, the end surface of the other end of the U-shaped cavity is rotatably connected to a rotating rod penetrating the cavity through a thrust bearing, the lower end of the rotating rod is fixedly connected to a threaded rod, the threaded surface of the threaded rod is threadedly connected to a threaded block, the lower end of the threaded block is fixedly connected to a second push rod, the lower end of the second push rod is fixedly connected to a second moving block, the circumferential surface of the second moving block is fixedly connected to a second sealing ring, the second sealing ring is slidably connected to the inner wall of the U-shaped cavity, and an air vent begins to be provided on the end surface of the U-shaped cavity close to one end of the rotating rod.

[0005] As an improvement of the above technical solution, the upper end of the rotating rod is fixedly connected to a rotating plate, the surface of the rotating plate is slidably connected to a square rod that passes through it, the lower end of the square rod is fixedly connected to a friction block, the surface of the square rod is wrapped with a spring, the upper end of the spring is fixedly connected to the rotating plate, the lower end of the spring is fixedly connected to the friction block, the upper end of the square rod is fixedly connected to a fixed rod, and the surface of the fixed rod is rotatably connected to a rotating ring via a thrust bearing.

[0006] As an improvement of the above technical solution, an annular frosted layer is provided on the end surface of the U-shaped cavity close to the rotating rod, and the annular frosted layer is provided corresponding to the friction block.

[0007] As an improvement of the above technical solution, an anti-dropping block is fixedly connected to the lower end of the threaded rod.

[0008] As an improvement of the above technical solution, a third sealing ring is fixedly connected to the inside of the lower end of the U-shaped cavity, and the U-shaped cavity is detachably connected to the pipette body through the third sealing ring.

[0009] Beneficial effects of the utility model:

[0010] 1. The entire liquid taking operation process only requires pulling up the pressure block and rotating the rotating rod, which greatly simplifies the liquid taking operation steps. At the same time, the second sealing ring can move slowly and steadily under the cooperation of the threaded rod and the threaded block, so that the liquid level can rise steadily, allowing the user to operate smoothly, thereby greatly reducing the user's operating difficulty, thereby avoiding the problem of over-discharge caused by improper control by the user in the prior art, resulting in the need to re-take liquid, thereby greatly improving the user's work efficiency in taking liquid.

[0011] 2. Under the action of the restoring force of the spring, the friction block fits tightly to the surface of the U-shaped cavity. Since the friction block and the surface of the U-shaped cavity can generate a large friction force, the self-locking ability of this mechanism can be greatly improved through the mutual cooperation of the friction block and the spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is the overall structure diagram of the utility model;

[0013] Figure 2 This is the overall cross-sectional structural diagram of the utility model;

[0014] Figure 3 This is a structural diagram of the liquid taking mechanism of the utility model;

[0015] Figure 4 This is an enlarged structural diagram of the liquid taking mechanism of the utility model;

[0016] Figure 5 This is an enlarged structural diagram of part A of the liquid taking mechanism of the utility model.

[0017] Figure numerals: 1. pipette body; 2. liquid collection mechanism; 21. U-shaped cavity; 22. first moving block; 23. first sealing ring; 24. first push rod; 25. pressure block; 26. air pressure hole; 27. sealing plug; 28. rotating rod; 29. ​​threaded rod; 291. threaded block; 292. second push rod; 293. second moving block; 294. second sealing ring; 295. air vent; 296. rotating plate; 297. square rod; 298. friction block; 299. spring; 2991. fixed rod; 2992. rotating ring; 2993. annular frosted layer; 2994. anti-fall-off block; 2995. third sealing ring. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0019] See also Figure 1-5The utility model provides a technical solution: a pipette for molecular biology experiments comprises a pipette body 1, a liquid taking mechanism 2 is arranged at the upper end of the pipette body 1, the liquid taking mechanism 2 comprises a U-shaped cavity 21, a U-shaped cavity 21 is arranged at the upper end of the pipette body 1, a first moving block 22 is arranged inside one end of the U-shaped cavity 21, a first sealing ring 23 is fixedly connected to the circumferential surface of the first moving block 22, the first sealing ring 23 is slidably connected to the inner wall of the U-shaped cavity 21, a first push rod 24 is fixedly connected to the upper end of the first push rod 24, a pressure block 25 is fixedly connected to the upper end of the first push rod 24, an air pressure hole 26 is opened on the surface of the U-shaped cavity 21, and an air pressure hole 26 is opened on the surface of the U-shaped cavity 21. A sealing plug 27 is provided inside the pressure hole 26, and the end face of the other end of the U-shaped cavity 21 is rotatably connected to a rotating rod 28 that runs through it through a thrust bearing, and the lower end of the rotating rod 28 is fixedly connected to a threaded rod 29, and the threaded surface of the threaded rod 29 is threadedly connected to a threaded block 291, and the lower end of the threaded block 291 is fixedly connected to a second push rod 292, and the lower end of the second push rod 292 is fixedly connected to a second moving block 293, and the circumferential surface of the second moving block 293 is fixedly connected to a second sealing ring 294, and the second sealing ring 294 is slidably connected to the inner wall of the U-shaped cavity 21, and an air vent 295 begins to be provided on the end face of the U-shaped cavity 21 close to the rotating rod 28.

[0020] In this embodiment, when the user needs to take liquid, he first inserts the lower end of the pipette body 1 into the solution to be taken, and then pulls the pressure block 25 with his hand. As the pressure block 25 moves upward, the first push rod 24 drives the first moving block 22 to move upward, thereby driving the first sealing ring 23 to slide upward on the inner wall of the U-shaped cavity 21. Under the action of the first sealing ring 23, negative pressure is generated inside the U-shaped cavity 21 and the pipette body 1, so that the solution to be taken enters the interior of the pipette body 1. When the solution is about to reach the mark of the pipette body 1, the pressure block 25 is stopped and then the fine adjustment process is performed. First, the rotating rod 28 is rotated. The rotation of the rotating rod 28 drives the threaded rod 29 to rotate, so that the threaded block 291 moves upward, and then the second moving block 293 is driven to move upward through the second push rod 292. The upward movement of the second moving block 293 drives the second sealing ring 294 to slide upward on the inner wall of the U-shaped cavity 21. Under the mutual cooperation of the air vent 295 and the second sealing ring 294, the solution inside the pipette body 1 Continue to rise. When the solution rises to the marked line of the pipette body 1, stop rotating the rotating rod 28. When it is necessary to release the liquid, pull out the sealing plug 27. The entire liquid extraction operation process only requires pulling up the pressure block 25 and rotating the rotating rod 28, thereby greatly simplifying the liquid extraction operation steps. At the same time, with the cooperation of the threaded rod 29 and the threaded block 291, the second sealing ring 294 can move slowly and steadily, so that the liquid level can rise steadily, allowing the user to operate smoothly, thereby greatly reducing the user's operating difficulty, and thus avoiding the problem of over-discharge caused by improper control by the user in the prior art, resulting in the need to re-extract the liquid, thereby greatly improving the user's liquid extraction work efficiency.

[0021] Specifically, the upper end of the rotating rod 28 is fixedly connected to the rotating plate 296, the surface of the rotating plate 296 is slidably connected to the square rod 297 that runs through it, the lower end of the square rod 297 is fixedly connected to the friction block 298, the surface of the square rod 297 is wrapped with a spring 299, the upper end of the spring 299 is fixedly connected to the rotating plate 296, the lower end of the spring 299 is fixedly connected to the friction block 298, the upper end of the square rod 297 is fixedly connected to the fixed rod 2991, and the surface of the fixed rod 2991 is rotatably connected to the rotating ring 2992 via a thrust bearing.

[0022] In this embodiment, when entering the fine-tuning process, in the initial state, the spring 299 is in a compressed state, and the rotating ring 2992 is first pulled. Since the rotating ring 2992 moves upward, the square rod 297 is driven to slide upward on the surface of the rotating plate 296 through the fixed rod 2991, thereby driving the friction block 298 to move upward. At this time, the spring 299 is compressed, and then the rotating ring 2992 is rotated to drive the rotating rod 28 to rotate through the rotating plate 296, so that the solution inside the pipette body 1 can be fine-tuned. When it is necessary to stop the fine-tuning, the rotating ring 2992 can be released. Under the action of the restoring force of the spring 299, the friction block 298 is tightly attached to the surface of the U-shaped cavity 21. Since the friction block 298 and the surface of the U-shaped cavity 21 can generate a large friction force, the self-locking ability of this mechanism can be greatly improved through the mutual cooperation of the friction block 298 and the spring 299.

[0023] Specifically, an annular frosted layer 2993 is disposed on the end surface of one end of the U-shaped cavity 21 close to the rotating rod 28 , and the annular frosted layer 2993 is disposed corresponding to the friction block 298 .

[0024] In this embodiment, by providing an annular frosted layer 2993 on the surface of the U-shaped cavity 21 , the friction between the friction block 298 and the U-shaped cavity 21 can be greatly improved, thereby further improving the self-locking ability of the mechanism.

[0025] Specifically, the lower end of the threaded rod 29 is fixedly connected with an anti-slip block 2994 .

[0026] In this embodiment, the anti-slip block 2994 is fixedly connected to the lower end of the threaded rod 29 to avoid the problem of the threaded block 291 slipping off the threaded rod 29.

[0027] Specifically, a third sealing ring 2995 is fixedly connected to the interior of the lower end of the U-shaped cavity 21 , and the U-shaped cavity 21 is detachably connected to the pipette body 1 via the third sealing ring 2995 .

[0028] In this embodiment, by providing the third sealing ring 2995 , the user can conveniently disassemble and clean the mechanism from the upper end of the pipette body 1 without affecting the normal use of the mechanism and the pipette body 1 .

[0029] Working principle and usage process: When the user needs to take liquid, first insert the lower end of the pipette body 1 into the solution to be taken, and then use the hand to pull the pressure block 25. As the pressure block 25 moves upward, the first push rod 24 drives the first moving block 22 to move upward, and then drives the first sealing ring 23 to slide upward on the inner wall of the U-shaped cavity 21. Under the action of the first sealing ring 23, negative pressure is generated inside the U-shaped cavity 21 and the pipette body 1, so that the solution to be taken enters the interior of the pipette body 1. When the solution is about to reach the mark of the pipette body 1, stop pulling up the pressure block 25, and then perform the fine-tuning process. First, turn the rotating rod 28. As the rotating rod 28 rotates, it drives the threaded rod 29 to rotate, and then the threaded block 291 moves upward, and then the second moving block 293 moves upward through the second push rod 292. As the second moving block 293 moves upward, it drives the second sealing ring 29 The inner wall of the U-shaped cavity 21 slides upward, and the solution in the pipette body 1 continues to rise under the cooperation of the air hole 295 and the second sealing ring 294. When the solution rises to the mark line of the pipette body 1, the rotation of the rotating rod 28 is stopped. When the liquid needs to be released, the sealing plug 27 can be pulled out. The entire liquid extraction operation process only requires pulling up the pressure block 25 and rotating the rotating rod 28, thereby greatly simplifying the liquid extraction operation steps. At the same time, under the cooperation of the threaded rod 29 and the threaded block 291, the second sealing ring 294 can be moved slowly and steadily, so that the liquid level can be The user can smoothly control the liquid by rising steadily, thereby greatly reducing the difficulty of operation for the user, thereby avoiding the problem in the prior art that the user is very likely to over-discharge due to improper control, which leads to the need to re-take liquid, thereby greatly improving the user's efficiency in taking liquid; when entering the fine-tuning process, in the initial state, the spring 299 is in a compressed state, and the rotating ring 2992 is pulled first. As the rotating ring 2992 moves upward, the square rod 297 is driven to slide upward on the surface of the rotating plate 296 through the fixed rod 2991, thereby driving the friction The wiper block 298 moves upward, at which time the spring 299 is compressed, and then the rotating ring 2992 is rotated to drive the rotating rod 28 to rotate through the rotating plate 296, so that the solution inside the pipette body 1 can be fine-tuned. When it is necessary to stop the fine-tuning, the rotating ring 2992 can be loosened. Under the action of the restoring force of the spring 299, the friction block 298 fits tightly against the surface of the U-shaped cavity 21. Since the friction block 298 and the surface of the U-shaped cavity 21 can generate a large friction force, the self-locking ability of this mechanism can be greatly improved through the mutual cooperation of the friction block 298 and the spring 299.

[0030] The above embodiments are only used to illustrate the technical solution of the present invention, but not to limit it.

Claims

1. A pipette for molecular biology experiments, comprising a pipette body (1), wherein the upper end of the pipette body (1) is provided with a liquid taking mechanism (2), characterized in that: The liquid taking mechanism (2) comprises a U-shaped cavity (21), the upper end of the pipette body (1) is provided with the U-shaped cavity (21), one end of the U-shaped cavity (21) is provided with a first moving block (22), the circumferential surface of the first moving block (22) is fixedly connected with a first sealing ring (23), the first sealing ring (23) is slidably connected with the inner wall of the U-shaped cavity (21), the upper end of the first moving block (22) is fixedly connected with a first push rod (24), the upper end of the first push rod (24) is fixedly connected with a pressing block (25), the surface of the U-shaped cavity (21) is provided with an air pressure hole (26), the interior of the air pressure hole (26) is provided with a sealing plug (27), the U-shaped cavity (21) is provided with a first sealing ring (23), and the first sealing ring (23) is slidably connected with the inner wall of the U-shaped cavity (21). ) is rotatably connected to an end surface of the other end of the U-shaped cavity (21) through a thrust bearing, and a rotating rod (28) is arranged therethrough; the lower end of the rotating rod (28) is fixedly connected to a threaded rod (29); the threaded surface of the threaded rod (29) is threadedly connected to a threaded block (291); the lower end of the threaded block (291) is fixedly connected to a second push rod (292); the lower end of the second push rod (292) is fixedly connected to a second moving block (293); the circumferential surface of the second moving block (293) is fixedly connected to a second sealing ring (294); the second sealing ring (294) is slidably connected to the inner wall of the U-shaped cavity (21); and an air vent (295) is provided at the end surface of one end of the U-shaped cavity (21) close to the rotating rod (28).

2. A molecular biology experiment pipette according to claim 1, characterized in that: The upper end of the rotating rod (28) is fixedly connected to a rotating plate (296), the surface of the rotating plate (296) is slidably connected to a square rod (297) penetrating the rotating plate, the lower end of the square rod (297) is fixedly connected to a friction block (298), the surface of the square rod (297) is wound with a spring (299), the upper end of the spring (299) is fixedly connected to the rotating plate (296), the lower end of the spring (299) is fixedly connected to the friction block (298), the upper end of the square rod (297) is fixedly connected to a fixed rod (2991), and the surface of the fixed rod (2991) is rotatably connected to a rotating ring (2992) via a thrust bearing.

3. A molecular biology experiment pipette according to claim 1, characterized in that: An annular frosted layer (2993) is provided on the end surface of one end of the U-shaped cavity (21) close to the rotating rod (28), and the annular frosted layer (2993) is provided corresponding to the friction block (298).

4. A molecular biology experiment pipette according to claim 1, characterized in that: The lower end of the threaded rod (29) is fixedly connected with an anti-slip block (2994).

5. A molecular biology experiment pipette according to claim 1, characterized in that: A third sealing ring (2995) is fixedly connected to the interior of the lower end of the U-shaped cavity (21), and the U-shaped cavity (21) is detachably connected to the pipette body (1) via the third sealing ring (2995).

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