High-precision electric fine adjustment pipette

Abstract

This application relates to the field of pipette technology and proposes a high-precision electrically adjustable pipette, including a pipette body, an aspiration head mounted at the bottom of the pipette body, a liquid receiving chamber inside the pipette body, a piston and a piston rod extending to the outside of the liquid receiving chamber, and a drive motor mounted at the top of the pipette body. The drive end of the drive motor is connected to a transmission mechanism, which is connected to the piston rod to drive the piston rod to move linearly. This invention, through the design of the drive motor, transmission mechanism, and microcontroller, can automatically perform liquid aspiration without manually pressing physical buttons to trigger the aspiration action. Combined with a precision lead screw and rotary encoder, it can accurately fine-tune the aspiration volume. An operation display screen and handle are provided on the surface of the pipette body, enabling one-handed operation. The simple operation significantly improves operational efficiency and reduces human error, making it particularly suitable for cell culture experiments.

Description

Technical Field

[0001] This application relates to the field of pipette technology, and in particular to a high-precision electrically adjustable pipette. Background Technology

[0002] Pipettes are core tools for micro-liquid manipulation in laboratories, widely used in biomedicine, chemical analysis, and cell culture. While traditional electric pipettes have achieved basic electric drive, they still suffer from the following technical challenges:

[0003] 1. Operation relies on manual intervention: Most electric pipettes still require users to manually press physical buttons to trigger the aspiration action. This can easily lead to deviations in aspirated volume due to differences in the pressure applied, especially in high-throughput experiments where repeated operation can easily cause fatigue errors.

[0004] 2. Volume adjustment is not intuitive: Existing products, such as mechanical pipettes, adjust the volume range by turning a knob, which requires reading from a dial. The accuracy of the setting is easily affected by visual errors or lighting conditions.

[0005] 3. It cannot perform automatic suction operation, and it is not convenient to operate and adjust with one hand.

[0006] Therefore, based on the above problems, a high-precision electric fine-tuning pipette is proposed. Utility Model Content

[0007] To address the problems mentioned in the background art, this application provides a high-precision electrically adjustable pipette.

[0008] The high-precision electrically adjustable pipette provided in this application adopts the following technical solution:

[0009] A high-precision electric fine-tuning pipette includes a pipette body, an aspiration head installed at the bottom of the pipette body, a liquid receiving chamber installed inside the pipette body, a piston and a piston rod extending to the outside of the liquid receiving chamber inside the liquid receiving chamber, a drive motor installed at the top of the pipette body, a transmission mechanism connected to the drive end of the drive motor, and the transmission mechanism connected to the piston rod for driving the piston rod to move linearly.

[0010] The gun body is also equipped with an electronic control system, which includes a microcontroller, a motor driver and a rotary encoder. An operation display screen is installed on the outer surface of the gun body, and the operation display screen is located at the front of the gun body. A handle is installed on the side wall of the gun body to facilitate hand operation of the operation display screen.

[0011] Preferably, the microcontroller is an MCU with an ADC, and the drive motor is a stepper motor.

[0012] Preferably, the operation display screen includes an LCD display screen, a rotary encoder, and a pick-up button, with the pick-up button located on the side wall of the operation display screen.

[0013] Preferably, the transmission mechanism includes a precision lead screw connected to the drive end of a drive motor, a lead screw sleeve engaging with the outer surface of the precision lead screw, and the lead screw sleeve being connected to a piston rod.

[0014] Preferably, a slider is fixed to the outer surface of the lead screw sleeve, and the slider is slidably connected to a slide rail on the inner wall of the gun body.

[0015] Preferably, the precision lead screw has a 0.5mm pitch and a 1.8° step angle.

[0016] Beneficial effects:

[0017] This invention, through the design of a drive motor, transmission mechanism, and microcontroller, can automatically perform liquid aspiration without the need for manual pressing of physical buttons to trigger the aspiration action. With the help of precision lead screws and rotary encoders, the aspiration volume can be accurately fine-tuned and controlled. An operation display screen and handle are set on the surface of the gun body, which can be operated with one hand. The method of use is simple, which can significantly improve the operation efficiency and reduce human error, making it especially suitable for cell culture experiments. Attached Figure Description

[0018] Figure 1 This is an external perspective view of the high-precision electrically adjustable pipette of this application;

[0019] Figure 2 This is a partial internal structure diagram of the high-precision electrically adjustable pipette of this application;

[0020] Figure 3 This application relates to a high-precision electrically adjustable pipette. Figure 2 Enlarged view of point A in the middle.

[0021] Explanation of reference numerals in the attached drawings: 1. Gun body; 2. Suction head; 3. Liquid receiving chamber; 4. Piston rod; 5. Drive motor; 6. Microcontroller; 7. Slider; 8. Rotary encoder; 9. Insert; 10. LCD display screen; 11. Knob encoder; 12. Suction button; 13. Precision lead screw; 14. Lead screw sleeve. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Example

[0024] like Figures 1-3 As shown, the high-precision electrically adjustable pipette disclosed in this application includes a pipette body 1, an aspiration head 2 installed at the bottom of the pipette body 1, a liquid receiving chamber 3 installed inside the pipette body 1, a piston and a piston rod 4 extending to the outside of the liquid receiving chamber 3 are arranged inside the liquid receiving chamber 3. These are all prior art. Currently, traditional pipettes use a structure such as a pressing spring and a pressing head on the surface of the piston rod, which is inconvenient for one-handed operation while adjusting the aspiration volume. At the same time, the error of manual pressing is large and the accuracy is not high enough. Therefore, this design is based on the existing technology. Specifically, a drive motor 5 is installed at the top of the pipette body 1. The drive end of the drive motor 5 is connected to a transmission mechanism, which is connected to the piston rod 4 and is used to drive the piston rod 4 to move linearly, thereby automatically aspirating and dispensing liquid. The amount aspirated is determined by the number of rotations of the drive motor 5.

[0025] The gun body 1 also houses an electronic control system, which includes a microcontroller 6, a motor driver, and a rotary encoder 8. The microcontroller 6 is an MCU with an ADC, which can accurately calculate and control the number of steps required by the stepper motor based on the set target volume, and control the output of the motor driver. The rotary encoder 8 is connected to the shaft of the drive motor 5, which can monitor the number of rotations of the drive motor 5, providing closed-loop feedback to ensure that the actual position of the piston movement is consistent with the MCU command, thus improving accuracy and reliability. The drive motor 5 is a stepper motor that can provide high-precision, controllable rotary motion. A model with small size, suitable torque, and small step angle is selected; in this embodiment, 1.8° / step or less can be selected.

[0026] An operation display screen is installed on the outer surface of the gun body 1. The operation display screen is located in front of the gun body 1 and can be seen at the natural point of the user's line of sight. A handle 9 is installed on the side wall of the gun body 1 to facilitate the operation of the operation display screen. Specifically, the handle 9 is located on one side of the operation display screen. When in use, the operator passes four fingers through the handle 9 to prevent the gun body 1 from falling out of the hand when operating with one hand.

[0027] The operation display includes an LCD display 10, a rotary encoder 11, and a suction button 12. The suction button 12 is located on the side wall of the operation display. The LCD display 10, the rotary encoder 11, and the suction button 12 are all electrically connected to the microcontroller 6. After passing four fingers through the insert 9, the rotary encoder 11 can be adjusted by the index finger to fine-tune the volume of liquid being suctioned. The suction button 12 on the side can be pressed by the index finger to easily start suction with one button without manual control. Specifically, when the suction button 12 is pressed, the MCU reads the currently set volume, calculates the required number of motor steps, and controls the driver to drive the stepper motor to precisely reverse (the piston moves outward during suction) the corresponding number of steps to complete the suction action. This eliminates the need for physical buttons on traditional electric pipettes to manually control the suction stroke.

[0028] The transmission mechanism includes a precision lead screw 13 connected to the drive end of the drive motor 5. A lead screw sleeve 14 meshes with the outer surface of the precision lead screw 13. The lead screw sleeve 14 is connected to the piston rod 4. A slider 7 is fixed on the outer surface of the lead screw sleeve 14. The slider 7 is slidably connected to the slide rail on the inner wall of the gun body 1, thereby ensuring the stability of the movement of the lead screw sleeve 14. The precision lead screw 13 has a 0.5mm pitch and a 1.8° step angle, which enables the theoretical single-step resolution to reach 0.1μL, resulting in higher accuracy.

[0029] Working principle: When using the pipette, the operator first removes the pipette from the pipette holder. When removing it, four fingers are inserted through the handle 9 to prevent the pipette body 1 from slipping out of the hand during one-handed operation. According to the actual needs, the volume to be aspirated is adjusted. The operator only needs to use the index finger to turn the knob encoder 11 to the required volume. The knob encoder 11 feeds back the signal to the MCU. Then, the aspiration button 12 on the side is pressed. The MCU can accurately calculate and control the number of steps required by the stepper motor according to the set target volume, and control the output of the motor driver, thereby driving the motor 5 to drive the precision lead screw 13 to rotate, which drives the lead screw sleeve 14 to move, thereby driving the piston rod 4 to move and rotate the corresponding number of steps, thus realizing the aspiration of the required volume. It can be operated with one hand and is convenient to use.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A high-precision electric micro-adjustment pipette, comprising a pipette body (1), wherein a suction head (2) is mounted on the bottom of the pipette body (1), and a liquid receiving cavity (3) is installed inside the pipette body (1), wherein a piston and a piston rod (4) extending to the outside of the liquid receiving cavity (3) are disposed inside the liquid receiving cavity (3), characterized in that: A drive motor (5) is installed on the top of the gun body (1). The drive end of the drive motor (5) is connected to a transmission mechanism. The transmission mechanism is connected to the piston rod (4) and is used to drive the piston rod (4) to move linearly. The gun body (1) is also equipped with an electronic control system, which includes a microcontroller (6), a motor driver and a rotary encoder (8). An operation display screen is installed on the outer surface of the gun body (1), and the operation display screen is located in front of the gun body (1). A handle (9) is installed on the side wall of the gun body (1) to facilitate hand operation of the operation display screen.

2. The high-precision electrically adjustable pipette according to claim 1, characterized in that: The microcontroller (6) is an MCU with an ADC, and the drive motor (5) is a stepper motor.

3. The high-precision electrically adjustable pipette according to claim 1, characterized in that: The operation display screen includes an LCD display screen (10), a rotary encoder (11), and a pick-up button (12), which is located on the side wall of the operation display screen.

4. The high-precision electrically adjustable pipette according to claim 1, characterized in that: The transmission mechanism includes a precision lead screw (13) connected to the drive end of the drive motor (5), and a lead screw sleeve (14) meshes with the outer surface of the precision lead screw (13). The lead screw sleeve (14) is connected to the piston rod (4).

5. The high-precision electrically adjustable pipette according to claim 4, characterized in that: The outer surface of the lead screw sleeve (14) is fixed with a slider (7), which is slidably connected to the slide rail on the inner wall of the gun body (1).

6. The high-precision electrically adjustable pipette according to claim 4, characterized in that: The precision lead screw (13) has a pitch of 0.5 mm and a step angle of 1.8°.

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