A multi-position adjustable pipette tip holder

Abstract

The application discloses a multi-gear adjustable pipette liquid taking auxiliary device and belongs to the technical field of pipettes. The auxiliary device comprises an empty cylinder, a first piston plate which is slidably connected to the inner wall of the empty cylinder, a driving plate which is fixedly connected to the surface of the first piston plate through a piston rod, a top plug which is fixedly connected to the bottom of the first piston plate through a first spring, a through hole which is formed in the top plug, a connecting rod which is fixedly connected to the bottom of the top plug, a bottom plug which is fixedly connected to the bottom of the connecting rod and fixedly connected to the empty cylinder, a first one-way valve which is mounted on the connecting rod and the first piston plate, an air inlet pipe which is fixedly connected to the outer wall of the empty cylinder, a liquid discharge speed-up valve which is fixedly connected to the air inlet pipe, a suction ball which is fixedly connected to the free end of the air inlet pipe, a second one-way valve which is mounted on the suction ball, a butt joint which is fixedly connected to the bottom of the empty cylinder, and a soft rubber plug which is fixedly connected to the outer wall of the butt joint. The auxiliary device is simple in operation and convenient in use, and the liquid taking and discharging precision of the pipette is improved.

Description

Technical Field

[0001] This invention relates to the field of pipette technology, and in particular to a multi-level adjustable pipette liquid dispensing aid. Background Technology

[0002] A pipette is a precise liquid transfer tool, primarily used for accurately aspirating and dispensing specific volumes of liquid. A pipette consists of a long, thin glass tube with an expansion section in the middle. Its lower end is designed with a pointed tip for easy and accurate liquid dispensing. A mark is engraved on the neck of the tube indicating the specific volume the pipette can accurately aspirate. In titration analysis, pipettes are frequently used to accurately transfer specific volumes of solution. Depending on the experimental requirements and the volume of the solution, an appropriate pipette size can be selected. Common pipette sizes include 1 ml, 2 ml, 5 ml, 10 ml, 25 ml, 50 ml, and 100 ml.

[0003] When using a pipette to collect liquid, first immerse the tip of the pipette into the liquid to be collected, while using one hand to stabilize the pipette and ensure it remains vertical. Then, use your other hand to press the bulb of the pipette to expel any air, and then place the bulb on top of the pipette. Release the bulb, using the air pressure difference to draw the liquid into the pipette, ensuring that the liquid collected exceeds the required measurement mark. Next, remove the bulb and seal the tip of the pipette with your index finger. Slightly release your index finger to allow excess liquid to flow out of the pipette until the liquid level (the lowest point of the concave meniscus) is level with the measurement mark on the side of the pipette. Seal the tip of the pipette tightly with your index finger again to complete the quantitative collection. When transferring the liquid to the target container, keep your index finger sealing the tip of the pipette, move the pipette tip into the container, and release your index finger to allow the liquid to flow out until all the liquid in the pipette is expelled (leaving only the last drop of liquid at the tip of the pipette), completing the pipetting process.

[0004] Traditional pipette manipulation requires a high level of skill and concentration from the operator and carries the risk of error due to human error. For example, failure to seal the pipette tip with the index finger in time may result in excessive liquid leakage, leading to insufficient volume and requiring repetition. Furthermore, controlling the liquid flow with the fingers during operation can easily result in excessive liquid discharge, increasing the complexity and uncertainty of the experiment. Additionally, when using larger pipettes, the process of transferring liquid to the target container may be time-consuming due to waiting for the liquid to flow out naturally, impacting experimental efficiency. Therefore, improvements are needed to the traditional pipette-based liquid collection tool (bulb) to address these issues. Summary of the Invention

[0005] The purpose of this invention is to solve the problems of excessive discharge or insufficient aspiration caused by manual operation errors in traditional pipetting operations, as well as the low efficiency caused by slow liquid discharge when using large-size pipettes, and to propose a multi-level adjustable pipette liquid collection assistant.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A multi-position adjustable pipette dispensing aid includes an empty cylinder and further includes: a first piston plate slidably connected to the inner wall of the empty cylinder, a drive plate fixedly connected to the surface of the first piston plate via a piston rod, a top plug fixedly connected to the bottom of the first piston plate via a first spring, the top plug having a through hole; a connecting rod fixedly connected to the bottom of the top plug, a bottom plug fixedly connected to the bottom of the connecting rod, the bottom plug being fixedly connected to the empty cylinder, and a first one-way valve installed on both the bottom plug and the first piston plate; an air inlet pipe fixedly connected to the outer wall of the empty cylinder, a drain speed-up valve fixedly connected to the air inlet pipe, a suction bulb fixedly connected to the free end of the air inlet pipe, a second one-way valve installed on the suction bulb; and a connector fixedly connected to the bottom of the empty cylinder, a soft rubber stopper fixedly connected to the outer wall of the connector.

[0008] To facilitate adjustment of the exhaust volume as needed, preferably, the outer wall of the empty cylinder has an adjustment groove, and an indicator needle is slidably connected in the adjustment groove. The inner wall of the empty cylinder has symmetrical first sliding grooves, and the surface of the indicator needle is symmetrically fixedly connected to a first sliding strip, which is slidably connected in the first sliding groove. The outer wall of the empty cylinder is fixedly connected to a pipetting metering setting. The top plug and bottom plug are both slidably connected in the empty cylinder. The indicator needle is provided with a fixing mechanism for fixing the position of the indicator needle.

[0009] To facilitate fixing the position of the indicator needle, the fixing mechanism further includes a first locking pin slidably connected to the side wall of the indicator needle, a second spring fixedly connected between the first locking pin and the indicator needle, and a first locking groove opened on the outer wall of the empty cylinder, the first locking groove matching the first locking pin.

[0010] To facilitate limiting the movement range of the first piston plate, preferably, a limiting block is fixedly connected to the inner wall of the empty cylinder, the limiting block and the first piston plate being able to abut and separate, and a limiting post is fixedly connected to the bottom of the first piston plate, the limiting post and the top plug being able to abut and separate.

[0011] To facilitate clamping and fixing this auxiliary device onto the pipette, preferably, it further includes: a support frame fixedly connected to the outer wall of the empty cylinder, the surface of the support frame having a second sliding groove, a first slider slidably connected in the second sliding groove, a movable plate fixedly connected to the surface of the first slider, and an inclined groove on the surface of the movable plate; a third sliding groove on the surface of the support frame, a second slider slidably connected in the third sliding groove, a trapezoidal plate fixedly connected to the surface of the second slider, and a second clamping wheel rotatably connected to the surface of the trapezoidal plate; hook-shaped plates symmetrically rotatably connected to the surface of the support frame, one end of the hook-shaped plates rotatably connected to the first clamping wheel, the other end of the hook-shaped plates rotatably connected to a rotating wheel, the rotating wheel slidably connected to the side wall of the trapezoidal plate, and a third spring fixedly connected between adjacent hook-shaped plates; and a power mechanism disposed on the support frame, the power mechanism being used to drive the movable plate to move.

[0012] To further improve the stability of the moving plate and the trapezoidal plate, both the first and second sliders are T-shaped.

[0013] To facilitate the movement of the movable plate, the power mechanism further includes a first rotating rod rotatably connected to the surface of the support frame. A knob and a first gear are fixedly connected to the outer wall of the first rotating rod, and a first rack is fixedly connected to the side wall of the movable plate. The first rack and the first gear cooperate with each other.

[0014] To facilitate fixing the position of the movable plate, a second locking post is slidably connected to the surface of the first rack, and a fourth spring is fixedly connected between the second locking post and the first rack. A second locking groove is opened on the surface of the support frame, and the second locking post and the second locking groove are matched with each other.

[0015] To further improve the stability of the first rack, the soft rubber plug is hollow, and a first connecting pipe is connected between the hollow cylinder and the soft rubber plug. The air inlet of the first connecting pipe is located between the first piston plate and the top of the hollow cylinder. An exhaust pipe is fixedly connected to the soft rubber plug through a pressure relief valve. A third one-way valve is installed on the first connecting pipe. The inner wall of the support frame has a through groove, and a branch pipe is fixedly connected between the through groove and the exhaust pipe. The inner diameter of the branch pipe is smaller than the inner diameter of the exhaust pipe.

[0016] To facilitate the removal of this auxiliary device, the surface of the first slider is further fixedly connected to a second piston plate via a push rod. The inner wall of the support frame is provided with a piston cavity, and the second piston plate is slidably connected in the piston cavity. A second connecting tube connects the piston cavity and the soft rubber plug.

[0017] Compared with the prior art, the present invention provides a multi-level adjustable pipette liquid dispensing aid, which has the following beneficial effects:

[0018] 1. This multi-position adjustable pipette dispensing aid uses the airflow inside the empty cylinder to inflate the soft rubber stopper by inserting it into the top of the pipette, thus achieving a tight seal between the dispensing aid and the top of the pipette.

[0019] 2. This multi-position adjustable pipette dispensing aid determines the position of the top stopper through position settings, thereby determining the movement distance of the drive plate. By pressing down on the drive plate, the piston rod moves downward, driving the first piston plate downward. During this process, the first one-way valve on the bottom stopper closes, the first one-way valve on the first piston plate opens, and the first spring is compressed, moving the first piston plate to the desired position and transferring the airflow to the area between the empty cylinder and the first piston plate. Subsequently, the drive plate moves upward autonomously under the rebound force of the first spring, returning to its initial position, causing the piston rod to move upward. The piston rod drives the first piston plate upward, during which the first one-way valve on the first piston plate closes, and the first one-way valve on the bottom stopper opens, drawing the airflow from the pipette into the empty cylinder and allowing the corresponding volume of liquid to enter the pipette, thus realizing the pipette dispensing function. This aid is simple to operate and convenient to use, while improving the dispensing efficiency of the pipette.

[0020] 3. This multi-level adjustable pipette dispensing aid allows for accelerated liquid dispensing by opening the dispensing speed valve and pressing the suction bulb with appropriate force during the pipette dispensing process. When the pipette is nearly empty, stopping the pressure on the suction bulb and rotating the knob moves the first and second clamping wheels away from the pipette, simultaneously releasing air from the soft rubber stopper. Removing the aid allows the liquid at the end of the pipette to flow out naturally and remain in a stagnant state, ensuring accurate liquid dispensing and improving dispensing efficiency.

[0021] 4. This multi-position adjustable pipette dispensing aid allows for easy adjustment of the airflow volume between the bottom plug and the first piston plate by sliding the indicator needle within the adjustment groove. This facilitates adjustment of the airflow rate extracted by the pipette, thereby controlling the dispensing volume. During this process, the first slide bar always blocks the adjustment groove, improving the airtightness of the empty cylinder and preventing air leakage. After the position is determined, the first locking pin engages with the corresponding first locking groove under the action of the second spring, preventing the first locking pin from moving.

[0022] 5. This multi-position adjustable pipette dispensing aid allows the first rotating rod to be rotated by hand-held knob. The first rotating rod drives the first gear to rotate, the first gear drives the first rack to move, the first rack drives the moving plate to move, the moving plate drives the trapezoidal plate to move, and the trapezoidal plate drives the hook plate to deflect. This facilitates clamping the empty tube at the top of the pipette, thus making it easier to fix the position of the empty tube, reducing the tilting of the empty tube during dispensing and dispensing, and improving the stability of the empty tube.

[0023] 6. This multi-position adjustable pipette dispensing aid, after clamping the empty cylinder onto the pipette, causes the second locking pin to engage in the corresponding second locking groove under the action of the fourth spring. Simultaneously, when the gas in the pipette is evacuated, the airflow flows into the soft rubber stopper through the first connecting tube. On the one hand, this allows the soft rubber stopper to fit more tightly with the pipette, thereby reducing the amount of outside air entering the pipette from the connection between the soft rubber stopper and the pipette, which could affect the accuracy of the dispensing result. On the other hand, excess gas is discharged from the exhaust pipe under the action of the pressure relief valve. Due to the high airflow velocity in the exhaust pipe, according to Bernoulli's principle, a suction force is generated in the branch pipe, which makes the second locking pin engage more firmly, thereby improving the stability of the moving plate. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a multi-level adjustable pipette liquid dispensing aid proposed in this invention;

[0025] Figure 2 This invention proposes a multi-level adjustable pipette liquid dispensing aid. Figure 1 Enlarged schematic diagram of the structure at point A in the diagram;

[0026] Figure 3 This invention proposes a multi-level adjustable pipette liquid dispensing aid. Figure 1 Schematic diagram of the BB cross-sectional structure in the middle;

[0027] Figure 4 This invention proposes a multi-level adjustable pipette liquid dispensing aid. Figure 3 Enlarged schematic diagram of the structure at point C;

[0028] Figure 5 This invention proposes a multi-level adjustable pipette liquid dispensing aid. Figure 3 Enlarged schematic diagram of the structure at point D;

[0029] Figure 6 This is a partial structural diagram of a multi-level adjustable pipette liquid dispensing aid proposed in this invention;

[0030] Figure 7 This is a schematic diagram of the power mechanism in a multi-level adjustable pipette liquid dispensing aid proposed in this invention;

[0031] Figure 8 This is a cross-sectional view of the support frame in a multi-level adjustable pipette dispensing aid proposed in this invention.

[0032] In the diagram: 1. Empty cylinder; 101. Connector; 102. Piston rod; 103. First piston plate; 104. First spring; 105. Top plug; 106. Connecting rod; 107. Bottom plug; 108. Through hole; 109. First one-way valve; 2. Air inlet pipe; 201. Drainage speed-up valve; 202. Suction bulb; 203. Second one-way valve; 204. Soft rubber stopper; 205. Drive plate; 206. Adjustment groove; 207. Indicator needle; 208. First slide groove; 209. First slide bar; 3. Pipette metering setting; 301. First locking post; 302. Second spring; 303. First locking groove; 304. Push rod; 305. Second piston plate; 306. Piston chamber; 307. Limiting block 308. Limiting post; 309. Knob; 4. Support frame; 401. First rotating rod; 402. First gear; 403. First rack; 404. Inclined groove; 405. Trapezoidal plate; 406. First clamping wheel; 407. Hook plate; 408. Rotating wheel; 409. Third spring; 5. Second sliding groove; 501. First slider; 502. Third sliding groove; 503. Second slider; 504. Second clamping wheel; 505. Second locking post; 506. Fourth spring; 507. Second locking groove; 6. First connecting pipe; 601. Third one-way valve; 602. Exhaust pipe; 603. Pressure relief valve; 604. Branch pipe; 605. Through groove; 606. Moving plate; 607. Second connecting pipe. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0034] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0035] Example 1:

[0036] Reference Figure 1 as well as Figure 3A multi-position adjustable pipette dispensing aid includes an empty cylinder 1, and further includes: a first piston plate 103 slidably connected to the inner wall of the empty cylinder 1; a drive plate 205 fixedly connected to the surface of the first piston plate 103 via a piston rod 102; a top plug 105 fixedly connected to the bottom of the first piston plate 103 via a first spring 104; and a through hole 108 on the top plug 105; a connecting rod 106 fixedly connected to the bottom of the top plug 105; and a bottom plug fixedly connected to the bottom of the connecting rod 106. 107, the bottom plug 107 is fixedly connected to the empty cylinder 1, and a first one-way valve 109 is installed on both the bottom plug 107 and the first piston plate 103; the air inlet pipe 2 is fixedly connected to the outer wall of the empty cylinder 1, and a liquid discharge speed-up valve 201 is fixedly connected to the air inlet pipe 2. A suction bulb 202 is fixedly connected to the free end of the air inlet pipe 2, and a second one-way valve 203 is installed on the suction bulb 202; the connector 101 is fixedly connected to the bottom of the empty cylinder 1, and a soft rubber plug 204 is fixedly connected to the outer wall of the connector 101.

[0037] It should be noted that the first one-way valve 109 on the bottom plug 107 allows the airflow to flow unidirectionally towards the top plug 105, and the first one-way valve 109 on the first piston plate 103 allows the airflow to flow unidirectionally towards the upper space of the first piston plate 103.

[0038] To facilitate limiting the movement range of the first piston plate 103, a limiting block 307 is fixedly connected to the inner wall of the empty cylinder 1. The limiting block 307 and the first piston plate 103 can be abutted and separated. A limiting post 308 is fixedly connected to the bottom of the first piston plate 103. The limiting post 308 and the top plug 105 can be abutted and separated.

[0039] Insert the soft rubber stopper 204 into the pipette to block it. Move the drive plate 205 upward, causing the piston rod 102 to move upward. The piston rod 102 drives the first piston plate 103 to move upward, thereby drawing the airflow from the pipette into the empty cylinder 1. During this process, the first one-way valve 109 on the bottom stopper 107 opens, and the first one-way valve 109 on the first piston plate 103 closes, allowing airflow to enter between the bottom stopper 107 and the first piston plate 103. When the drive plate 205 moves downward, the first one-way valve 109 on the first piston plate 103... When 109 is opened, the first one-way valve 109 on the bottom stopper 107 is closed, which facilitates the transfer of airflow to the area between the empty cylinder 1 and the first piston plate 103, thereby facilitating the entry of liquid into the pipette. When drainage is required, simply open the drainage acceleration valve 201 and press the suction bulb 202 with appropriate force to increase the pressure and accelerate the drainage of liquid from the pipette. However, when the pipette is about to be emptied, stop pressing to retain the last liquid residue when the pipette flows out, ensuring accurate pipetting volume. This auxiliary device is simple to operate and convenient to use, and at the same time, it improves the accuracy of liquid picking and drainage of the pipette.

[0040] Example 2:

[0041] Reference Figures 3-4 as well as Figure 6 It is basically the same as Example 1, but further, a specific implementation scheme is added to facilitate the adjustment of exhaust volume as needed.

[0042] Reference Figures 3-4 as well as Figure 6 An adjustment groove 206 is opened on the outer wall of the empty cylinder 1. An indicator needle 207 is slidably connected in the adjustment groove 206. A first sliding groove 208 is symmetrically opened on the inner wall of the empty cylinder 1. A first sliding strip 209 is symmetrically fixedly connected to the surface of the indicator needle 207. The first sliding strip 209 is slidably connected in the first sliding groove 208. A pipetting metering position 3 is fixedly connected to the outer wall of the empty cylinder 1. A fixing mechanism is provided on the indicator needle 207 to fix the position of the indicator needle 207.

[0043] In this embodiment, the fixed connection between the bottom plug 107 and the empty cylinder 1 is transformed into a system in which both the top plug 105 and the bottom plug 107 are slidably connected inside the empty cylinder 1.

[0044] It should be noted that the pipetting volume settings 3, from top to bottom, are 1ml, 2ml, 5ml, and 10ml.

[0045] Reference Figures 3-4 as well as Figure 6 The fixing mechanism includes a first locking post 301 that is slidably connected to the side wall of the indicator needle 207. A second spring 302 is fixedly connected between the first locking post 301 and the indicator needle 207. A first locking groove 303 is opened on the outer wall of the empty cylinder 1, and the first locking groove 303 matches the first locking post 301.

[0046] Slide the indicator needle 207 in the adjustment groove 206 to adjust the airflow volume between the bottom plug 107 and the first piston plate 103 as needed, thereby facilitating the adjustment of the airflow rate extracted by the pipette and controlling the liquid volume taken by the pipette. During this process, the first slide bar 209 always blocks the adjustment groove 206, thereby improving the airtightness of the empty cylinder 1 and reducing air leakage. After the gear is determined, the first locking pin 301 is engaged in the corresponding first locking groove 303 under the action of the second spring 302.

[0047] Example 3:

[0048] Reference Figures 1-3 , Figure 5 as well as Figure 7 The embodiment is basically the same as that in Example 2, but with the addition of a specific implementation scheme that facilitates clamping and fixing the auxiliary device onto the pipette.

[0049] Because the empty cylinder 1 is prone to tilting during the movement of the drive plate 205, thus affecting the liquid dispensing effect, therefore, referring to Figures 1-3 , Figure 5 as well as Figure 7 This multi-position adjustable pipette dispensing aid also includes: a support frame 4 fixedly connected to the outer wall of the empty cylinder 1; a second sliding groove 5 is formed on the surface of the support frame 4; a first slider 501 is slidably connected in the second sliding groove 5; a moving plate 606 is fixedly connected to the surface of the first slider 501; and an inclined groove 404 is formed on the surface of the moving plate 606; a third sliding groove 502 is formed on the surface of the support frame 4; a second slider 503 is slidably connected in the third sliding groove 502; and a trapezoidal plate 4 is fixedly connected to the surface of the second slider 503. 05. A second clamping wheel 504 is rotatably connected to the surface of the trapezoidal plate 405; a hook-shaped plate 407 is symmetrically rotatably connected to the surface of the support frame 4, one end of the hook-shaped plate 407 is rotatably connected to a first clamping wheel 406, and the other end of the hook-shaped plate 407 is rotatably connected to a rotating wheel 408, the rotating wheel 408 is slidably connected to the side wall of the trapezoidal plate 405, and a third spring 409 is fixedly connected between adjacent hook-shaped plates 407; a power mechanism is provided on the support frame 4, which is used to drive the moving plate 606 to move.

[0050] To improve the stability of the moving plate 606 and the trapezoidal plate 405, both the first slider 501 and the second slider 503 are T-shaped.

[0051] Reference Figure 7 The power mechanism includes a first rotating rod 401 rotatably connected to the surface of the support frame 4. A knob 309 and a first gear 402 are fixedly connected to the outer wall of the first rotating rod 401. A first rack 403 is fixedly connected to the side wall of the moving plate 606. The first rack 403 and the first gear 402 cooperate with each other.

[0052] The first rotating rod 401 is rotated by holding the knob 309. The first rotating rod 401 drives the first gear 402 to rotate. The first gear 402 drives the first rack 403 to move. The first rack 403 drives the moving plate 606 to move. The moving plate 606 drives the trapezoidal plate 405 to move. The trapezoidal plate 405 drives the hook plate 407 to deflect, thereby facilitating the clamping of the empty cylinder 1 onto the pipette. This makes it easier to fix the position of the empty cylinder 1, reducing the tilting of the empty cylinder 1 during liquid collection and discharge, and improving the stability of the empty cylinder 1.

[0053] Example 4:

[0054] Reference Figures 1-3 , Figure 5 as well as Figures 7-8 The implementation is basically the same as in Example 3, but with an additional specific implementation for fixing the position of the movable plate 606.

[0055] Reference Figures 1-3 , Figure 5 as well as Figures 7-8A second locking post 505 is slidably connected to the surface of the first rack 403. A fourth spring 506 is fixedly connected between the second locking post 505 and the first rack 403. A second locking groove 507 is opened on the surface of the support frame 4. The second locking post 505 and the second locking groove 507 are matched with each other.

[0056] To facilitate improving the stability of the first rack 403, refer to Figures 1-3 , Figure 5 as well as Figures 7-8 The soft rubber plug 204 is hollow. A first connecting pipe 6 is connected between the empty cylinder 1 and the soft rubber plug 204. The air inlet end of the first connecting pipe 6 is located between the first piston plate 103 and the top of the empty cylinder 1. An exhaust pipe 602 is fixedly connected to the soft rubber plug 204 through a pressure relief valve 603. A third one-way valve 601 is installed on the first connecting pipe 6. The inner wall of the support frame 4 has a through groove 605. A branch pipe 604 is fixedly connected between the through groove 605 and the exhaust pipe 602. The inner diameter of the branch pipe 604 is smaller than the inner diameter of the exhaust pipe 602.

[0057] For easier removal of this auxiliary device, please refer to... Figure 8 The surface of the first slider 501 is fixedly connected to the second piston plate 305 by the push rod 304. The inner wall of the support frame 4 is provided with a piston cavity 306. The second piston plate 305 is slidably connected in the piston cavity 306. The piston cavity 306 and the soft rubber plug 204 are connected by a second connecting tube 607.

[0058] It should be noted that the third one-way valve 601 is unidirectionally directed towards the soft rubber stopper 204.

[0059] After the empty cylinder 1 is clamped onto the pipette, the second locking pin 505 engages with the corresponding second locking groove 507 under the action of the fourth spring 506. Simultaneously, when gas is drawn from the pipette, the airflow flows through the first connecting pipe 6 into the soft rubber stopper 204. This allows the soft rubber stopper 204 to fit more tightly with the pipette, reducing the amount of outside air entering the pipette from the connection point and thus affecting the accuracy of the liquid collection. Furthermore, excess gas is discharged from the vent pipe 602 under the action of the pressure relief valve 603. The airflow velocity is relatively high, which, according to Bernoulli's principle, generates a suction force in the branch tube 604, thereby making the second clamping post 505 more securely engaged and improving the stability of the moving plate 606. At the same time, after the liquid is dispensed, simply rotating the knob 309 can separate the first clamping wheel 406, the second clamping wheel 504 from the pipette. Simultaneously, the first slider 501 drives the push rod 304 to move, and the push rod 304 drives the second piston plate 305 to move within the piston chamber 306, thereby drawing air from the soft rubber stopper 204 into the piston chamber 306, thus facilitating the removal of this auxiliary device.

[0060] In other words, during use, first rotate knob 309 to clamp and fix the first clamping wheel 406 and the second clamping wheel 504 to the outer wall of the pipette. At the same time, the second piston plate 305 pushes some of the air in the piston chamber 306 into the soft rubber stopper 204, causing the soft rubber stopper 204 to block the top of the pipette. During the liquid extraction process, the extracted air flows into the soft rubber stopper 204 through the first connecting pipe 6, making the soft rubber stopper 204 fit more tightly with the pipette. Excess gas is discharged from the exhaust pipe 602 under the action of the pressure relief valve 603. After the liquid extraction is completed, rotate knob 309 in the opposite direction to separate the first clamping wheel 406 and the second clamping wheel 504 from the pipette. At the same time, the second piston plate 305 draws the airflow in the soft rubber stopper 204 into the piston chamber 306, making it easy to remove the soft rubber stopper 204 from the pipette.

[0061] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A multi-position adjustable pipette dispensing aid, comprising an empty cylinder (1), characterized in that, Also includes: A first piston plate (103) is slidably connected to the inner wall of the empty cylinder (1). A drive plate (205) is fixedly connected to the surface of the first piston plate (103) via a piston rod (102). A top plug (105) is fixedly connected to the bottom of the first piston plate (103) via a first spring (104). A through hole (108) is opened on the top plug (105). A connecting rod (106) is fixedly connected to the bottom of the top plug (105). A bottom plug (107) is fixedly connected to the bottom of the connecting rod (106). The bottom plug (107) is fixedly connected to the empty cylinder (1). A first one-way valve (109) is installed on both the bottom plug (107) and the first piston plate (103). An air inlet pipe (2) is fixedly connected to the outer wall of the empty cylinder (1). A drain speed-up valve (201) is fixedly connected to the air inlet pipe (2). A suction bulb (202) is fixedly connected to the free end of the air inlet pipe (2). A second one-way valve (203) is installed on the suction bulb (202). A connector (101) is fixedly connected to the bottom of the empty cylinder (1), and a soft rubber plug (204) is fixedly connected to the outer wall of the connector (101). The soft rubber plug (204) is hollow. A first connecting pipe (6) is connected between the empty cylinder (1) and the soft rubber plug (204). The air inlet end of the first connecting pipe (6) is located between the first piston plate (103) and the top of the empty cylinder (1). An exhaust pipe (602) is fixedly connected to the soft rubber plug (204) through a pressure relief valve (603). A third one-way valve (601) is installed on the first connecting pipe (6). The first check valve (109) on the bottom plug (107) allows the airflow to flow unidirectionally toward the top plug (105), and the first check valve (109) on the first piston plate (103) allows the airflow to flow unidirectionally toward the upper space of the first piston plate (103).

2. The multi-level adjustable pipette dispensing aid according to claim 1, characterized in that, The outer wall of the empty cylinder (1) has an adjustment groove (206), and an indicator needle (207) is slidably connected in the adjustment groove (206). The inner wall of the empty cylinder (1) has symmetrical first sliding grooves (208). The surface of the indicator needle (207) is symmetrically fixedly connected to a first slide bar (209), which is slidably connected in the first sliding groove (208). The outer wall of the empty cylinder (1) is fixedly connected to a pipetting metering setting (3). The top stopper (105) and the bottom stopper (107) are both slidably connected in the empty cylinder (1). The indicator needle (207) is provided with a fixing mechanism, which is used to fix the position of the indicator needle (207).

3. The multi-level adjustable pipette dispensing aid according to claim 2, characterized in that, The fixing mechanism includes a first locking post (301) slidably connected to the side wall of the indicator needle (207), a second spring (302) fixedly connected between the first locking post (301) and the indicator needle (207), and a first locking groove (303) opened on the outer wall of the empty cylinder (1), the first locking groove (303) matching the first locking post (301).

4. The multi-level adjustable pipette dispensing aid according to claim 1, characterized in that, The inner wall of the empty cylinder (1) is fixedly connected to a limiting block (307), the limiting block (307) and the first piston plate (103) can be abutted and separated, the bottom of the first piston plate (103) is fixedly connected to a limiting post (308), the limiting post (308) and the top plug (105) can be abutted and separated.

5. The multi-level adjustable pipette dispensing aid according to claim 1, characterized in that, Also includes: A support frame (4) is fixedly connected to the outer wall of the empty cylinder (1). A second sliding groove (5) is opened on the surface of the support frame (4). A first slider (501) is slidably connected in the second sliding groove (5). A moving plate (606) is fixedly connected to the surface of the first slider (501). An inclined groove (404) is opened on the surface of the moving plate (606). A third slide groove (502) is formed on the surface of the support frame (4). A second slider (503) is slidably connected in the third slide groove (502). A trapezoidal plate (405) is fixedly connected to the surface of the second slider (503). A second clamping wheel (504) is rotatably connected to the surface of the trapezoidal plate (405). A hook-shaped plate (407) is symmetrically rotatably connected to the surface of the support frame (4). One end of the hook-shaped plate (407) is rotatably connected to a first clamping wheel (406), and the other end of the hook-shaped plate (407) is rotatably connected to a rotating wheel (408). The rotating wheel (408) is slidably connected to the side wall of the trapezoidal plate (405). A third spring (409) is fixedly connected between adjacent hook-shaped plates (407). The power mechanism is mounted on the support frame (4) and is used to drive the moving plate (606) to move.

6. The multi-level adjustable pipette dispensing aid according to claim 5, characterized in that, Both the first slider (501) and the second slider (503) are T-shaped.

7. The multi-level adjustable pipette dispensing aid according to claim 5, characterized in that, The power mechanism includes a first rotating rod (401) rotatably connected to the surface of the support frame (4), a knob (309) and a first gear (402) are fixedly connected to the outer wall of the first rotating rod (401), and a first rack (403) is fixedly connected to the side wall of the moving plate (606), with the first rack (403) and the first gear (402) cooperating with each other.

8. The multi-level adjustable pipette dispensing aid according to claim 7, characterized in that, The surface of the first rack (403) is slidably connected to a second locking post (505), and a fourth spring (506) is fixedly connected between the second locking post (505) and the first rack (403). The surface of the support frame (4) is provided with a second locking groove (507), and the second locking post (505) and the second locking groove (507) are matched with each other.

9. The multi-level adjustable pipette dispensing aid according to claim 8, characterized in that, The inner wall of the support frame (4) has a through groove (605), and a branch pipe (604) is fixedly connected between the through groove (605) and the exhaust pipe (602). The inner diameter of the branch pipe (604) is smaller than the inner diameter of the exhaust pipe (602).

10. A multi-level adjustable pipette dispensing aid according to claim 9, characterized in that, The surface of the first slider (501) is fixedly connected to the second piston plate (305) by the push rod (304). The inner wall of the support frame (4) is provided with a piston cavity (306). The second piston plate (305) is slidably connected in the piston cavity (306). The piston cavity (306) and the soft rubber plug (204) are connected by a second connecting tube (607).

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