High-precision liquid metering device and metering method thereof

Abstract

The invention discloses a liquid high-precision metering device and a metering method thereof, the liquid high-precision metering device comprises a control end, a reagent bottle, a peristaltic pump, a liquid outlet, an air pipe, a reagent pipe and a metering device, the peristaltic pump extracts and meters a reagent in the reagent bottle through the reagent pipe, and the liquid high-precision metering device is characterized in that the metering device is arranged on the reagent pipe. According to the high-precision liquid metering device and the metering method thereof, the metering pipe is arranged to be a spirally-coiled transparent hollow pipeline, the diameter in the pipe is reduced, the measurement adjusting component and the measurement component are matched with each other, the measurement component is moved to the calculated measurement point position through the control end, and after the liquid level reaches, the measurement component is triggered, so that the liquid level is accurately measured. The peristaltic pump and the valve are controlled, so that accurate metering is realized, and the influence of horizontal inclination is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of precision metrology, and particularly to a high-precision liquid metering device and a metering method thereof. Background Technique

[0002] Precise metering of liquid agents refers to the high-precision quantitative measurement of liquid pharmaceutical agents or other liquid substances, which is widely used in industries such as pharmaceuticals, chemicals, food and beverages.

[0003] Currently, the metering methods of common on-line analysis equipment (COD, ammonia nitrogen, total phosphorus, total nitrogen) usually adopt the metering method of the metering tube as shown in Figure 1 After the reagent is pumped into the metering tube by a peristaltic pump, when the liquid level reaches the specified height, the liquid level is metered by triggering a photoelectric switch. The advantages of this metering method are simple structure and low cost, but the metering accuracy is low. Moreover, if the on-line analysis equipment is designed to be carried out, the non-level placement will also affect the metering result, resulting in inaccurate reagent sampling and affecting the analysis result, leading to errors.

[0004] Therefore, a high-precision liquid metering device and a metering method thereof are proposed to solve the deficiencies existing in the above-mentioned prior art. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-precision liquid metering device and a metering method thereof to solve the problems raised in the above background technique.

[0006] To achieve the above purpose, the present invention provides the following technical solutions: A high-precision liquid metering device and a metering method thereof. The high-precision liquid metering device includes a control end, a reagent bottle, a peristaltic pump, a liquid outlet, an air pipe, a reagent pipe and a metering device. The peristaltic pump pumps and meters the reagent in the reagent bottle through the reagent pipe. It is characterized in that a metering device is provided on the reagent pipe; The metering device includes a metering tube, a measurement adjustment component and a measurement component. The measurement component is assembled on the measurement adjustment component, and the measurement component is controlled by the measurement adjustment component to move to the metering position to meter the liquid in the metering tube; A honeycomb structure rectifying device and a conical defoamer are also provided at the connection between the reagent pipe and the metering tube.

[0007] As a further scheme of the present invention: the metering tube is a transparent hollow pipeline coiled in a spiral shape.

[0008] As a further solution of the present invention: The measurement and adjustment component includes a sleeve, two ring seats, a driven rotating ring, a spiral chute, a circumferential adjustment motor, a driving gear, a circumferential adjustment gear, and a driving shaft. A fixed sleeve is installed between the two ring seats. The driven rotating ring is installed inside the ring seat through a bearing. A rotatable driving shaft is installed between the two driven rotating rings. The measurement component is slidably installed on the driving shaft. A circumferential adjustment motor is installed on the ring seat. The output shaft of the circumferential adjustment motor is installed with the driving gear. A circumferential adjustment gear meshing with the driving gear is fixedly installed on the driven rotating ring. A spiral chute is arranged inside the sleeve. One side of the measurement component is slidably connected to the spiral chute.

[0009] As a further solution of the present invention: The metering tube has the same helix angle, pitch, and helix direction parameters as the spiral chute. The total height of the spiral chute is greater than the total height of the metering tube. Since the spiral chute is located outside the metering tube, the diameter of the spiral chute needs to be greater than the diameter of the metering tube. The inclination angle of the measurement component is the same as the inclination angle of the tangent line of the helix of the metering tube and the spiral chute. The metering tube and the spiral chute are coaxial.

[0010] As a further solution of the present invention: The bottom pipe orifice of the metering tube is communicated with the reagent tube, and the top pipe orifice of the metering tube is communicated with the peristaltic pump.

[0011] A metering method for high-precision liquid metering, using the high-precision liquid metering device as described above, specifically includes the following steps; S1: Calculate its capacity by measuring the inner diameter of the inner tube of the metering tube and the length of one turn of the helix of the metering tube, and calibrate the accurate value through small-scale tests. S2: According to the calculation method obtained in S, calculate and control the circumferential adjustment motor through the control end to control the movement of the measurement component. The measurement component moves upward along the spiral chute to the required liquid level position. S3: The peristaltic pump extracts the reagent under negative pressure until the reagent reaches the measurement point of the measurement component, triggering the measurement component to send an electrical signal. The peristaltic pump stops, and the pipeline is switched to drain the reagent completely, completing one reagent metering, and repeating this process.

[0012] As a further solution of the present invention: The metering tube is a jacketed transparent hollow pipeline.

[0013] As a further solution of the present invention: the measurement and adjustment component includes a sleeve, a ring seat, a linear module mechanism, a circumferential adjustment motor, a driving gear, a circumferential adjustment gear, an air port and a vertical slide rail. The metering tube is fixed inside the ring seat. The ring seat is rotatably installed with a circumferential adjustment gear through a bearing. A circumferential adjustment motor with an output shaft for installing the driving gear is fixed on the ring seat. The driving gear meshes with the circumferential adjustment gear. The sleeve is fixed on the top of the circumferential adjustment gear. The circumferential adjustment motor can drive the sleeve to rotate coaxially outside the metering tube through the circumferential adjustment gear. A vertical slide rail is also provided on the sleeve. A linear module mechanism is arranged inside the vertical slide rail. The measuring component is installed on the linear module mechanism and the measuring component is slidably installed with the vertical slide rail. An air port is arranged at the top of the metering tube.

[0014] As a further solution of the present invention: it further includes an inclination correction system. A bracket is arranged at the top of the sleeve. A gyroscope sensor a is installed at the top of the metering tube. A gyroscope sensor b and a brush ring are respectively installed on the bracket. The brush ring is used for power supply to the gyroscope sensor b and the linear module mechanism.

[0015] The metering method for high-precision liquid metering uses the high-precision liquid metering device as described above, and specifically includes the following steps; S1: Measure the capacity of the interlayer space of the metering tube, calculate the capacity through the height, and calibrate the accurate value through small-scale tests; S2: Calculate the inclination angle and inclination direction through the gyroscope sensor a, transmit them to the control end, and the control end drives the sleeve to rotate through the inclination angle and inclination direction to correct the measurement angle and measurement point of the measuring component, and correct the measurement angle of the measuring component to be perpendicular to the inclination direction measured by the gyroscope sensor a; S3: According to the calculation method obtained in S, calculate and control the linear module mechanism through the control end, and the linear module mechanism drives the measuring component to move to the required liquid level position; S4: The peristaltic pump extracts the reagent under negative pressure until the reagent reaches the measurement point of the measuring component to trigger the measuring component to send an electrical signal, the peristaltic pump stops, switches the pipeline to drain the reagent completely, and completes one reagent metering, and repeats this process.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. For the high-precision liquid metering device and its metering method, by setting the metering tube as a spirally coiled transparent hollow pipeline to reduce the inner diameter of the tube, the measurement and adjustment component and the measuring component cooperate with each other. The measuring component is moved to the calculated measuring point position through the control end. After the liquid level reaches, the measuring component is triggered to control the peristaltic pump and the valve, realizing accurate metering and being not affected by horizontal inclination.

[0017] 2. The liquid high-precision metering device and its metering method. By setting a jacket structure for the metering tube, the reagent shows obvious fluctuations after entering the interior, improving the measurement accuracy. The circumferential adjustment of the measurement adjustment component and the axial adjustment of the linear module mechanism, in cooperation with the tilt correction system, make the measurement angle and measurement point of the correction measurement component perpendicular to the tilt direction measured by the gyroscope sensor a, with the included angle remaining at °, achieving precise metering and being unaffected by horizontal tilt. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. 6 is a schematic diagram of the prior art structure of a liquid high-precision metering device; Figure 2 FIG. 7 is a schematic diagram of the structure of a liquid high-precision metering device; Figure 3 FIG. 8 is a schematic diagram of the conical defoamer structure of a liquid high-precision metering device; Figure 4 FIG. 9 is a schematic diagram of the measurement component structure of a liquid high-precision metering device; Figure 5 FIG. 10 is a schematic diagram of the structure of Embodiment 1 of a liquid high-precision metering device; Figure 6 FIG. 11 is a schematic cross-sectional view of the structure of Embodiment 1 of a liquid high-precision metering device; Figure 7 FIG. 12 is an exploded view of the structure of Embodiment 1 of a liquid high-precision metering device; Figure 8 FIG. 13 is a schematic diagram of the structure of Embodiment 2 of a liquid high-precision metering device; Figure 9 FIG. 14 is a schematic cross-sectional view of the structure of Embodiment 2 of a liquid high-precision metering device; Figure 10 FIG. 15 is an exploded view of the structure of Embodiment 2 of a liquid high-precision metering device; Figure 11 FIG. 16 is a tilt measurement angle diagram of Embodiment 2 in a liquid high-precision metering device; Figure 12 FIG. 17 is a top view of the tilt measurement angle of Embodiment 2 in a liquid high-precision metering device.

[0019] In the figures: 1. reagent bottle; 2. peristaltic pump; 3. liquid outlet; 4. air pipe; 5.; 6. reagent tube; 7.; 8. metering device; 9. sleeve; 10. ring seat; 11. bearing; 12. linear module mechanism; 13. spiral chute; 14.; 15. metering tube; 16. drive shaft; 17. circumferential adjustment motor; 18. drive gear; 19. circumferential adjustment gear; 20. honeycomb structure rectifying device; 21. bracket; 22. gyroscope sensor a; 23. gyroscope sensor b; 24. brush ring; 25. air port; 26. measurement component; 27. vertical slide rail; 28. conical defoamer. Detailed implementation manners

[0020] Embodiment 1 Please refer to Figures 1 to 7 , in the embodiment of the present invention, for the liquid high-precision metering device and its metering method, the liquid high-precision metering device includes a control end, a reagent bottle 1, a peristaltic pump 2, a liquid outlet 3, an air pipe 4, a reagent pipe 6 and a metering device 8. The peristaltic pump 2 extracts and meters the reagent in the reagent bottle 1 through the reagent pipe 6. It is characterized in that a metering device 8 is arranged on the reagent pipe 6; The metering device 8 includes a metering pipe 15, a measurement adjustment component and a measurement component 26. The measurement component 26 is assembled on the measurement adjustment component. The measurement adjustment component controls the movement of the measurement component 26 to the metering position to meter the liquid in the metering pipe 15. The measurement component 26 is provided with a transmitting module and a receiving module for triggering the photoelectric switch. When the reagent reaches the measurement point of the photoelectric switch through the metering pipe 15, the photoelectric switch is triggered to turn off the peristaltic pump 2 to achieve the metering function. The measurement adjustment component is used to adjust and correct the measurement point to improve the metering accuracy; A honeycomb structure rectifying device 20 and a conical defoamer 28 are also arranged at the connection between the reagent pipe 6 and the metering pipe 15. The numerous hexagonal holes in the honeycomb structure can guide the fluid, making the disordered fluid flow in a certain direction, reducing the lateral fluctuation and vortex generation of the fluid, thereby playing a role in stabilizing the fluid flow. The conical defoamer is a device commonly used to eliminate foam in liquids, mainly composed of a conical main body, a liquid inlet, a liquid outlet and other basic parts. To enhance the defoaming effect, auxiliary structures such as a rotating component, a flow guide plate, a shear net, and a spraying device may also be equipped.

[0021] As a further scheme of the present invention: the metering pipe 15 is a spiral coiled transparent hollow pipeline. The metering pipe 15 is made of glass, and the diameter of the metering pipe 15 is less than 5 mm to maintain good measurement accuracy. According to some requirements with higher accuracy, the diameter of the metering pipe 15 can be further reduced.

[0022] As a further solution of the present invention: The measurement and adjustment component includes a sleeve 9, two ring seats 10, a driven rotating ring 12, a spiral chute 13, a circumferential adjustment motor 17, a driving gear 18, a circumferential adjustment gear 19 and a driving shaft 16. A fixed sleeve 9 is installed between the two ring seats 10. The driven rotating ring 12 is installed inside the ring seat 10 through a bearing 11. A rotatable driving shaft 16 is installed between the two driven rotating rings 12. The measurement component 26 is slidably installed on the driving shaft 16. The circumferential adjustment motor 17 is installed on the ring seat 10. The output shaft of the circumferential adjustment motor 17 is installed with the driving gear 18. The circumferential adjustment gear 19 meshing with the driving gear 18 is fixedly installed on the driven rotating ring 12. A spiral chute 13 is arranged inside the sleeve 9. One side of the measurement component 26 is slidably connected with the spiral chute 13. The circumferential adjustment motor 17 is a stepping motor. The circumferential adjustment motor 17 drives the circumferential adjustment gear 19 to rotate through the driving gear 18. The circumferential adjustment gear 19 drives the measurement component 26 to move on the spiral chute 13, so as to realize that the measurement component 26 can detect the spiral coiled metering pipe 15 in all positions.

[0023] As a further solution of the present invention: The spiral lift angle, pitch and helix direction parameters of the metering pipe 15 are the same as those of the spiral chute 13. The total height of the spiral chute 13 is greater than the total height of the metering pipe 15. Since the spiral chute 13 is located outside the metering pipe 15, the diameter of the spiral chute 13 needs to be greater than the diameter of the metering pipe 15. The inclination angle of the measurement component 26 is the same as the inclination angle of the tangent line of the spiral line of the metering pipe 15 and the spiral chute 13. The metering pipe 15 and the spiral chute 13 are coaxial. This design can keep the angle and distance between the measurement component 26 and the metering pipe 15 consistent during the movement process.

[0024] As a further solution of the present invention: The bottom pipe orifice of the metering pipe 15 is communicated with the reagent pipe 6, and the top pipe orifice of the metering pipe 15 is communicated with the peristaltic pump 2. A central cylinder 14 is arranged inside the metering pipe 15. The central cylinder 14 can be made of glass material, which is bonded to the metering pipe 15 to keep the metering pipe 15 stable. The central cylinder 14 is fixed on the carrier.

[0025] The metering method for high-precision liquid metering uses a high-precision liquid metering device, which specifically includes the following steps; S1: By measuring the inner pipe diameter of the metering pipe 15 and the length of one turn of the spiral of the metering pipe 15, calculate its capacity, and calibrate the accurate value through small-scale tests. S2: According to the calculation method obtained in S1, calculate and control the circumferential adjustment motor 17 through the control end to control the movement of the measurement component 26. The measurement component 26 moves upward along the spiral chute 13 to the required liquid level position. S3: The peristaltic pump 2 extracts the reagent under negative pressure until the reagent reaches the measurement point of the measurement component 26, triggering the measurement component 26 to send an electrical signal. The peristaltic pump 2 stops, the pipeline is switched to drain the reagent completely, and one reagent measurement is completed. This process is repeated.

[0026] In the prior art, the inflow and outflow of the reagent tube 6 are controlled by valves. This application follows the original methods of valve control, pipeline control, liquid suction, and liquid discharge. When the reagent is extracted into the metering tube 15, the required reagent volume V 总 , the volume from the valve to the initial end of the metering tube 15 is V 1 , the required reagent volume in the metering tube 15 is V 2 , the pipe radius of the metering tube 15 is r 管 , and the designed length of the required reagent in the metering tube 15 is x; V 总 = V 1+ V 2 ; V 1 is a fixed value, so it can be obtained through repeated measurement of the reagent volume; V 2 = πr 管 2 × x; By calculation, the length of the required reagent in the metering tube 15 is obtained as x; The number of turns of the spiral is n, and the radius of the spiral is r 螺 ; The circumference of each turn of the spiral is C; C = 2πr 螺 ; The number of turns of the circumferential adjustment gear 19 is Y; Y = x ÷ C; Let the number of teeth of the driving gear 18 be Z 1 , and the number of teeth of the circumferential adjustment gear 19 be Z 2 ; The gear ratio is i; i = Z 1 ÷ Z 2 ; The number of turns of the circumferential adjustment motor 17 is U; U = Y ÷ i; Thus, the driving number of turns of the circumferential adjustment motor 17 is calculated, so that the control end can move the measurement component 26 to the metering position. After the reagent liquid level reaches the measurement point of the measurement component 26, the measurement component 26 is triggered, the control end controls the peristaltic pump 2 to stop, and the valve switches the water path to discharge the reagent.

[0027] This technology has the following advantages; 1. Since the metering tube 15 is a spirally coiled transparent hollow pipeline with a small inner diameter, it can still maintain accurate metering accuracy when the metering tube 15 is not in a horizontal state, so that the metering accuracy is not affected by the horizontal angle; 2. The method of driving the measuring component 26 to move for fixed-point measurement by the measuring and adjusting component can reduce the number of measuring components 26 arranged, and the movement is precise, the control is accurate, and any point can be measured and positioned.

[0028] Embodiment 2 Please refer to Figure 1 、 2 、3, 4, 8, 9, 10, 11 and 12. In the embodiment of the present invention, a liquid high-precision metering device and its metering method, the liquid high-precision metering device includes a control end, a reagent bottle 1, a peristaltic pump 2, a liquid outlet 3, an air pipe 4, a reagent pipe 6 and a metering device 8. The peristaltic pump 2 extracts and meters the reagent in the reagent bottle 1 through the reagent pipe 6. It is characterized in that a metering device 8 is arranged on the reagent pipe 6; The metering device 8 includes a metering tube 15, a measuring and adjusting component and a measuring component 26. The measuring component 26 is assembled on the measuring and adjusting component, and the measuring and adjusting component is used to control the measuring component 26 to move to the metering position to meter the liquid in the metering tube 15; A honeycomb structure rectifying device 20 and a conical defoaming device 28 are also arranged at the connection between the reagent pipe 6 and the metering tube 15.

[0029] In a preferred embodiment, the metering tube 15 is a jacketed transparent hollow pipeline, and the metering tube 15 is composed of inner and outer sleeves. The sleeves can be made of glass, and an inner layer is formed inside, and the inside of the inner layer is flat and uniform to ensure the accuracy of measurement.

[0030] In a preferred embodiment, the measurement adjustment component includes a sleeve 9, a ring seat 10, a linear module mechanism 12, a circumferential adjustment motor 17, a driving gear 18, a circumferential adjustment gear 19, an air port 25, and a vertical slide rail 27. The metering pipe 15 is fixed inside the ring seat 10. The ring seat 10 is installed with a rotatable circumferential adjustment gear 19 through a bearing 11. A circumferential adjustment motor 17 with an output shaft installed with a driving gear 18 is fixed on the ring seat 10. The driving gear 18 meshes with the circumferential adjustment gear 19. The sleeve 9 is fixed on the top of the circumferential adjustment gear 19. The circumferential adjustment motor 17 can drive the sleeve 9 to rotate coaxially outside the metering pipe 15 through the circumferential adjustment gear 19. A vertical slide rail 27 is also provided on the sleeve 9. A linear module mechanism 12 is arranged inside the vertical slide rail 27. The measurement component 26 is installed on the linear module mechanism 12 and the measurement component 26 is slidably installed with the vertical slide rail 27. An air port 25 is provided at the top of the metering pipe 15. During the test, it is found that if the metering pipe 15 is a tubular shape with the same diameter at the top and bottom, during its tilting process, the liquid level will remain horizontal and the liquid level height will not change. However, since the measurement component 26 is fixed, the tilting of the device will affect the detection of the measurement component 26, resulting in errors. Therefore, in this application, the circumferential adjustment motor 17 drives the rotation of the sleeve 9 to adjust its measurement angle, and cooperates with the linear module mechanism 12 to control the measurement height, so as to achieve precise metering. The calculation formula is as follows; The capacity is V 总 , the inner diameter of the outer pipe is set as r 1 , the outer diameter of the inner pipe is set as r 2 , and the height is h; V 总 = π(r 1 2 - r 2 2 ) × h; By controlling the height of the measurement component 26 through the linear module mechanism 12, the liquid level measurement can be achieved; Regarding how to determine the height position of the measurement component 26, it can be measured by a laser ranging instrument.

[0031] In a preferred embodiment, it further includes an inclination correction system. A bracket 21 is provided at the top of the sleeve 9, and a gyroscope sensor a22 is installed at the top of the metering pipe 15. A gyroscope sensor b23 and a brush ring 24 are respectively installed on the bracket 21. The brush ring 24 is used for power supply to the gyroscope sensor b23 and the linear module mechanism 12. A gyroscope sensor is a sensor used to measure angles and their rate of change. A gyroscope sensor is usually a micro-electromechanical system gyroscope based on MEMS technology. Using the Coriolis force principle, when a mass block vibrates in one direction and the carrier rotates simultaneously, the mass block will be subjected to the Coriolis force perpendicular to the vibration direction, resulting in a small displacement. By detecting this displacement change, the sensor can calculate the rotational angular velocity and angle change of the carrier, thereby obtaining the inclination angle and data of the metering pipe 15 in this way, and adjusting the measurement angle of the measuring component 26 through the sleeve 9 to ensure the accuracy of the measurement data. The gyroscope sensor b23 obtains the inclination angle and data of the sleeve 9.

[0032] The metering method for high-precision liquid metering uses a high-precision liquid metering device, which specifically includes the following steps; S1: Measure the capacity of the interlayer space of the metering pipe 15, calculate the capacity through the height, and calibrate the accurate value through pilot tests; S2: Calculate the inclination angle and inclination direction through the gyroscope sensor a22 and transmit them to the control terminal. The control terminal drives the sleeve 9 to rotate through the inclination angle and inclination direction to correct the measurement angle and measurement point of the measuring component 26. The corrected measurement angle of the measuring component 26 is perpendicular to the inclination direction measured by the gyroscope sensor a22; S3: According to the calculation method obtained in S1, calculate and control the linear module mechanism 12 through the control terminal, and the linear module mechanism 12 drives the measuring component 26 to move to the required liquid level position; S4: The peristaltic pump 2 extracts the reagent under negative pressure until the reagent reaches the measurement point of the measuring component 26 to trigger the measuring component 26 to send an electrical signal. The peristaltic pump 2 stops, switches the pipeline to drain the reagent completely, and completes one reagent metering, and repeats this process.

[0033] It should be noted that the above embodiments all belong to the same inventive concept. The descriptions of the embodiments have their own emphases. For the parts not described in detail in individual embodiments, reference can be made to the descriptions in other embodiments.

[0034] The above-described embodiments only represent the implementation manners of the present invention. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the inventive concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent should be subject to the appended claims.

Claims

1. A high-precision liquid metering device and a metering method thereof, the high-precision liquid metering device comprising a control end, a reagent bottle (1), a peristaltic pump (2), a liquid outlet (3), an air pipe (4), a reagent tube (6) and a metering device (8), wherein the peristaltic pump (2) extracts and measures the reagent in the reagent bottle (1) through the reagent tube (6), and the device is characterized in that: The reagent tube (6) is provided with a metering device (8); The metering device (8) comprises a metering tube (15), a measuring adjustment component, and a measuring component (26), wherein the measuring component (26) is mounted on the measuring adjustment component, and the measuring adjustment component controls the measuring component (26) to move to a metering position to meter the liquid in the metering tube (15); A honeycomb structure rectifying device (20) and a conical defoamer (28) are also provided at the connection point between the reagent tube (6) and the metering tube (15).

2. The high-precision liquid metering device according to claim 1, characterized in that: The metering tube (15) is a transparent hollow pipeline that is spirally coiled.

3. The high-precision liquid metering device according to claim 2, characterized in that: The measuring and adjusting component comprises a sleeve (9), two ring seats (10), a driven rotating ring (12), a spiral slide groove (13), a circumferential adjustment motor (17), a driving gear (18), a circumferential adjustment gear (19) and a driving shaft (16); a fixed sleeve (9) is installed between the two ring seats (10); a driven rotating ring (12) is installed inside the ring seat (10) via a bearing (11); a rotatable driving shaft (16) is installed between the two driven rotating rings (12); a measuring component (26) is slidably installed on the driving shaft (16); a circumferential adjustment motor (17) is installed on the ring seat (10); a driving gear (18) is installed on the output shaft of the circumferential adjustment motor (17); a circumferential adjustment gear (19) meshing with the driving gear (18) is fixedly installed on the driven rotating ring (12); a spiral slide groove (13) is provided inside the sleeve (9); and one side of the measuring component (26) is slidably connected to the spiral slide groove (13).

4. The high-precision liquid metering device according to claim 3, characterized in that: The helical angle, pitch and direction of rotation of the metering tube (15) and the spiral chute (13) are the same; the total height of the spiral chute (13) is greater than the total height of the metering tube (15); the spiral chute (13) is located outside the metering tube (15); therefore, the diameter of the spiral chute (13) needs to be greater than the diameter of the metering tube (15); the inclination angle of the measuring component (26) is the same as the inclination angle of the helical tangent of the metering tube (15) and the spiral chute (13); and the metering tube (15) and the spiral chute (13) maintain a coaxial center.

5. The high-precision liquid metering device according to any one of claims 2 to 4, characterized in that: The bottom pipe opening of the metering tube (15) is connected to the reagent tube (6), and the top pipe opening of the metering tube (15) is connected to the peristaltic pump (2).

6. The high-precision liquid metering device and the metering method thereof according to claim 1, characterized in that: The metering tube (15) is a transparent hollow pipeline with a jacket.

7. The high-precision liquid metering device and the metering method thereof according to claim 6, characterized in that: The measuring and adjusting component comprises a sleeve (9), a ring seat (10), a linear module mechanism (12), a circumferential adjustment motor (17), a driving gear (18), a circumferential adjustment gear (19), an air port (25) and a vertical slide rail (27); the metering tube (15) is fixed inside the ring seat (10); the ring seat (10) is provided with a rotatable circumferential adjustment gear (19) via a bearing (11); a circumferential adjustment motor (17) having an output shaft mounted with a driving gear (18) is fixed on the ring seat (10); the driving gear (18) and the circumferential adjustment gear are connected to each other. (19) are meshed with each other, the sleeve (9) is fixed on the top of the circumferential adjustment gear (19), the circumferential adjustment motor (17) can drive the sleeve (9) to rotate coaxially on the outer side of the metering tube (15) through the circumferential adjustment gear (19), the sleeve (9) is also provided with a vertical slide rail (27), a linear module mechanism (12) is provided in the vertical slide rail (27), the measuring component (26) is installed on the linear module mechanism (12) and the measuring component (26) and the vertical slide rail (27) are slidably installed, and an air port (25) is provided on the top of the metering tube (15).

8. The high-precision liquid metering device and the metering method thereof according to claim 7, characterized in that: The device also includes a tilt correction system, wherein a bracket (21) is provided on the top of the sleeve (9), a gyroscope sensor a (22) is installed on the top of the metering tube (15), a gyroscope sensor b (23) and a brush ring (24) are respectively installed on the bracket (21), and the brush ring (24) is used to supply power to the gyroscope sensor b (23) and the linear module mechanism (12).

9. A method for high-precision measurement of liquids, characterized in that: The high-precision liquid metering device according to claim 5 specifically comprises the following steps: S1: Calculate the capacity of the measuring tube (15) by measuring the inner diameter of the measuring tube (15) and the length of one spiral turn of the measuring tube (15), and calibrate the accurate value through a small test; S2: According to the calculation method obtained in S1, the control end calculates and controls the circumferential adjustment motor (17) to control the movement of the measuring component (26), and the measuring component (26) moves upward along the spiral slide groove (13) to the desired liquid level position; S3: The peristaltic pump (2) extracts the reagent under negative pressure until the reagent reaches the measuring point of the measuring component (26), triggering the measuring component (26) to send an electrical signal, and the peristaltic pump (2) stops, and the pipeline is switched to drain the reagent, completing one reagent measurement, and this is repeated.

10. A method for high-precision measurement of liquids, characterized in that: The high-precision liquid metering device according to claim 8 specifically comprises the following steps: S1: By measuring the interlayer space capacity of the measuring tube (15), the capacity is calculated by the height, and the precise value is corrected by a small test; S2: Calculate the tilt angle and tilt direction through the gyro sensor a (22), transmit them to the control end, and the control end drives the sleeve (9) to rotate according to the tilt angle and tilt direction, and correct the measurement angle and measurement point of the measuring component (26), and correct the measurement angle of the measuring component (26) to be perpendicular to the tilt direction measured by the gyro sensor a (22); S3: According to the calculation method obtained in S1, the linear module mechanism (12) is calculated and controlled by the control end, and the linear module mechanism (12) drives the measuring component (26) to move to the desired liquid level position; S4: The peristaltic pump (2) extracts the reagent under negative pressure until the reagent reaches the measuring point of the measuring component (26), triggering the measuring component (26) to send an electrical signal, and the peristaltic pump (2) stops, and the pipeline is switched to drain the reagent, completing one reagent measurement, and this is repeated.

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