A rotary metering control method and metering device

Abstract

This invention discloses a rotary quantitative metering control method and metering device. The method comprises: m rollers evenly distributed within a housing, where m is a positive integer greater than 1; an elastic hose wrapped around the outer circumference of the rollers, with fluid flowing within the hose; a buffer assembly at the outlet of the elastic hose, pre-stored with fluid; in one metering cycle, the rollers rotate to compress the elastic hose to deliver fluid, with a preset fluid delivery volume of V0, a ​​roller rotation angle of S1, where S1 is a positive integer multiple of (360° ÷ m), and the delivered fluid volume of V1. After one metering delivery cycle, one roller returns to its original position on the housing, ensuring that in any metering cycle, the starting and ending positions of the roller rotation for quantitative fluid delivery are consistent with the origin. If V1 is less than V0, the buffer assembly is compressed to supplement the difference in volume V2, making V0 = V1 + V2. This invention has the advantages of simple control, high metering accuracy, and high filling efficiency.

Description

Technical Field

[0001] This invention belongs to the field of fluid transport technology, specifically relating to a rotary quantitative metering control method and metering device. Background Technology

[0002] Currently, in the field of fluid transfer pumps, traditional peristaltic pumps are widely used in various industries, including chemical, pharmaceutical, and food filling industries, due to their advantages such as no pollution, strong self-priming ability, simple structure, and good accuracy. A peristaltic pump is like squeezing a fluid-filled tube with your fingers; as your fingers slide forward, the fluid moves forward. However, in a peristaltic pump, rollers replace the fingers. Fluid is pumped by alternately squeezing and releasing the elastic delivery tube within the pump, much like squeezing a tube with two fingers. The rollers squeeze and rotate the elastic tube, creating positive and negative pressure chambers inside, which then flow out the fluid.

[0003] Traditional peristaltic pumps, which use multiple sets of rollers to roll and squeeze the flexible tubing, are primarily used for metered fluid delivery. Current peristaltic pumps achieve metered fluid delivery by controlling the motor to rotate the same number of times to obtain approximately the same volume of fluid. Under fixed speed conditions, within the same time interval, the motor rotates the same number of times, driving the rollers to squeeze the flexible tubing. The point where the rollers stop is the starting point of the next metered fluid delivery. Therefore, the starting and ending positions of the rollers are constantly changing, and their position also changes as they leave the working surface at the outlet.

[0004] However, peristaltic pumps exhibit pulsation during operation. When the roller extrusion component leaves the working surface at the outlet, it suddenly releases the occupied volume, causing a momentary decrease in liquid flow at the outlet and even liquid backflow. Furthermore, the larger the inner diameter of the hose, the larger the volume occupied by the extrusion component on the hose, and the more pronounced the flow pulsation at the outlet.

[0005] Due to the pulsation phenomenon, and the fact that the position of the roller extrusion component is constantly changing when it leaves the working surface at the outlet, the amount of fluid delivered within the same time interval may vary under a fixed rotation speed, resulting in a difference in the volume of fluid transported by the roller extrusion component on the hose.

[0006] In existing technologies, to ensure the accuracy of peristaltic pumps in metering fluid delivery and reduce flow deviation, the conventional approach is to use hoses with smaller inner diameters. The problem with this method is that, to deliver the same volume of fluid, the smaller diameter hose requires more rotations, which not only prolongs filling time and reduces efficiency, but also increases the frequency of hose compression, significantly shortening hose lifespan and reducing the stability of the peristaltic pump's metering delivery. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the large quantitative error caused by the continuous change of the starting and ending positions of the roller extrusion component and the pulsation phenomenon of the peristaltic pump roller component when leaving the working surface in the prior art. The invention provides a rotary quantitative metering control method and metering device with compact structure, simple control, high metering accuracy and high filling efficiency.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0009] A rotary quantitative metering control method includes m rollers evenly distributed inside a housing, where m is a positive integer and m≥1; an elastic hose is wound around the outer circumference of the rollers, and fluid flows inside the elastic hose. One end of the elastic hose is an inlet for drawing in fluid, and the other end is an outlet for discharging fluid. The outlet of the elastic hose is equipped with a buffer assembly, which pre-stores fluid. The buffer assembly is used to regulate the output of fluid to achieve quantitative metering and delivery of fluid.

[0010] In one metering cycle of fluid delivery by rotating rollers to squeeze the flexible hose, the preset fluid delivery volume is V0, the preset rotation angle of a single roller is S1, the value of S1 is a positive integer multiple of (360°÷m), and the delivered fluid volume is V1. After completing one fluid metering delivery, any one of the rollers returns to the origin position marked on the housing, so that in any metering cycle, the starting position and the ending position of the roller rotation to deliver a quantitative amount of fluid remain consistent with the origin.

[0011] If the actual transport volume V1 of the fluid is less than the preset transport volume V0, the buffer component is squeezed to supplement the difference in volume V2, so as to achieve V1+V2=V0.

[0012] As a further improvement of the present invention, if the pre-stored fluid volume V21 in the buffer component is greater than V2, the roller is controlled to rotate by an angle S1, and the buffer component is squeezed at the same time to supplement the difference in volume V2, so as to achieve V1+V2=V0; so as to enter the next metering cycle until the pre-stored fluid volume in the buffer component is detected to be less than V2.

[0013] As a further improvement of the present invention, if the pre-stored fluid volume V22 in the buffer component is less than V2, and V1+V22<V0, then the angle of rotation of a single roller is controlled to be S2, S2=S1+(360°÷m), and the fluid delivery volume is (V1+V3), where V3 is the fluid volume in the elastic hose between two adjacent rollers; the fluid volume simultaneously drawn back by the buffer component is (V3-V2), and the fluid volume quantitatively delivered by the outlet of the elastic hose is V0=(V1+V3)-(V3-V2)=V1+V2.

[0014] As a further improvement of the present invention, if the pre-stored fluid volume (V3-V2) in the buffer component is less than V2 and V1+(V3-V2)<V0, then the rotation angle of the single roller is controlled to be S2, the fluid volume sucked back by the buffer component is 2×(V3-V2), and the fluid volume quantitatively delivered by the elastic hose is V0=V1+V2; the above fluid delivery process is repeated until the pre-stored fluid volume in the buffer component is greater than V2.

[0015] As a general technical concept, the present invention provides a rotary quantitative metering device for implementing the above-mentioned rotary quantitative metering control method, comprising: a housing and a buffer assembly, wherein multiple rollers are evenly distributed inside the housing, and elastic hoses are provided on the outer periphery of the rollers; the rollers rotate to squeeze the elastic hoses to realize fluid delivery; the outlet of the elastic hoses is inserted in the buffer assembly, and the buffer assembly squeezes or releases the elastic hoses to regulate the output of fluid and realize quantitative metering and delivery of fluid.

[0016] As a further improvement of the present invention, the buffer assembly includes a lifting pressure plate and a fixed plate, which are respectively located on both sides of the elastic hose. Under the drive of the drive assembly, the lifting pressure plate moves up and down to get closer to or away from the fixed plate, squeezing or releasing the elastic hose, and using the elastic deformation of the elastic hose to regulate the output of fluid.

[0017] As a general technical concept, the present invention provides a rotary quantitative metering device for implementing the above-mentioned rotary quantitative metering control method, comprising: a housing, a three-way connector, a liquid outlet pipe, and a buffer assembly. Multiple rollers are evenly distributed inside the housing, and elastic hoses are provided on the outer periphery of each roller. The rollers rotate to compress the elastic hoses, thereby achieving fluid delivery. The three-way connector connects the outlet of the elastic hose, the liquid outlet pipe, and the buffer assembly. The buffer assembly pre-stores fluid and is used to regulate the fluid output to achieve quantitative fluid metering and delivery.

[0018] As a further improvement of the present invention, the buffer assembly includes a positioning seat, a liquid storage hose, and clamping rollers; the liquid storage hose is straightened and fixed on the positioning seat, the liquid storage hose is connected to a tee connector, and clamping rollers are provided on the outside of the liquid storage hose, controlling the clamping rollers to move back and forth along the liquid storage hose to realize the fluid being drawn into or squeezed out of the liquid storage hose.

[0019] As a further improvement of the present invention, the positioning seat includes a first positioning seat and a second positioning seat, and the three-way connector is fixed in the first positioning seat; the second positioning seat is provided with a hose connector for fixing the liquid storage hose.

[0020] Compared with the prior art, the advantages of the present invention are as follows:

[0021] 1. The rotary quantitative metering control method of the present invention, by evenly distributing multiple rollers within a housing and placing an elastic hose between the outer circumference of the rollers and the inner wall of the housing, achieves fluid delivery by squeezing the hose as the rollers rotate. By controlling the starting and ending positions of the rollers in each metering cycle to remain consistent relative to the origin, and by using a buffer component at the outlet of the elastic hose to replenish the fluid volume difference or to reabsorb excess fluid, the method achieves the goal of maintaining a consistent volume of fluid delivered each time. This method enables fixed-point metering delivery based on demand, significantly reduces manufacturing costs, meets the requirements of both small and large load capacities, and ensures high precision. The present invention effectively solves the technical problems of large quantitative errors caused by the constantly changing starting and ending positions of the roller squeezing components and the pulsation phenomenon of the peristaltic pump roller components when leaving the working surface in the prior art.

[0022] 2. The rotary quantitative metering device of the present invention has a lifting pressure plate and a fixed plate respectively provided on both sides of the outlet of the elastic hose. When it is necessary to replenish the fluid difference, the lifting pressure plate moves closer to the fixed plate to squeeze the elastic hose to replenish the fluid; when it is necessary to suck back the excess fluid, the lifting pressure plate moves away from the fixed plate to loosen the elastic hose, and the elastic hose uses its own elastic deformation to achieve fluid back suction. It has the advantages of simple operation and precise control, and improves the stability of quantitative transmission of the metering device.

[0023] 3. The rotary quantitative metering device of the present invention connects the outlet of the elastic hose, the liquid outlet, and the buffer assembly through a three-way connector. The buffer assembly consists of a positioning seat, a liquid storage hose, and clamping rollers. The liquid storage hose is straightened and fixed on the positioning seat and connected to the three-way connector. Clamping rollers are provided on the outside of the liquid storage hose. When it is necessary to replenish the fluid difference, the clamping rollers move closer to the three-way connector to squeeze the liquid storage hose to replenish the fluid. When it is necessary to back-suction excess fluid, the clamping rollers move away from the three-way connector to loosen the liquid storage hose, and the liquid storage hose relies on its own elastic deformation to achieve fluid back-suction. It has the advantages of simple operation and precise control, and improves the stability of quantitative transmission of the metering device. Attached Figure Description

[0024] Figure 1 This is a schematic diagram illustrating the principle of replenishing the buffer component with differential fluid in Embodiment 1 of the present invention.

[0025] Figure 2 This is a schematic diagram illustrating the principle of the buffer component drawing back excess fluid in Embodiment 1 of the present invention.

[0026] Figure 3 This is a schematic diagram illustrating the principle of replenishing the buffer component with differential fluid in Embodiment 2 of the present invention.

[0027] Figure 4This is a schematic diagram illustrating the principle of the buffer component drawing back excess fluid in Embodiment 2 of the present invention.

[0028] Figure 5 This is a schematic diagram illustrating the principle of replenishing the buffer component with differential fluid in Embodiment 3 of the present invention.

[0029] Figure 6 This is a schematic diagram illustrating the principle of the buffer component drawing back excess fluid in Embodiment 3 of the present invention.

[0030] Legend:

[0031] 1. Lifting pressure plate; 2. Fixing plate; 3. Elastic hose; 4. Roller; 5. T-connector; 6. Discharge pipe; 7. First positioning seat; 8. Liquid storage hose; 9. Clamping roller; 10. Second positioning seat; 11. Hose connector; 100. Fluid; 101. Housing. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0033] This invention discloses a rotary quantitative metering control method. Within a housing 101, m rollers 4 are evenly distributed, where m is a positive integer and m ≥ 1. An elastic hose 3 is wound around the outer circumference of the rollers 4. Fluid 100 flows within the elastic hose 3. One end of the elastic hose 3 is an inlet for drawing in fluid 100, and the other end is an outlet for discharging fluid 100. A buffer assembly is provided at the outlet of the elastic hose 3. The buffer assembly pre-stores a certain volume of fluid 100. Based on specific metering requirements, the buffer assembly is used to regulate the output of fluid 100 to achieve quantitative metering and delivery of fluid 100.

[0034] In one metering cycle of fluid 100 conveyed by the rotation of roller 4 squeezing the elastic hose 3, the preset conveying volume of fluid 100 is V0, the preset rotation angle of a single roller 4 is S1, and the value of S1 is a positive integer multiple of (360° ÷ m), where m is the number of rollers 4, and the actual fluid conveying volume is V1. After completing one fluid metering conveying cycle, any one of the rollers 4 returns to the origin position marked on the housing 101, ensuring that the starting and ending positions of the roller rotation for quantitative fluid conveying remain consistent with the origin in any metering cycle. If the actual conveying volume V1 of fluid 100 is less than the preset conveying volume V0, the buffer component is squeezed to supplement the difference in volume V2, so that V1 + V2 = V0.

[0035] If the volume V21 of fluid 100 pre-stored in the buffer component is greater than V2, then control the roller 4 to rotate by an angle S1 and squeeze the buffer component to replenish the difference in volume V2, so as to achieve V1+V2=V0; and enter the next metering cycle until the volume of fluid pre-stored in the buffer component is detected to be less than V2.

[0036] If the volume V22 of fluid 100 pre-stored in the buffer component is less than V2, i.e., V1+V22<V0, then the angle controlling the rotation of a single roller 4 is S2, S2=S1+(360°÷m), which means rotating by an additional angle between two rollers. The conveying volume of fluid 100 is V1+V3, where V3 is the fluid volume in the elastic hose 3 between two adjacent rollers 4; the volume of fluid 100 simultaneously drawn back by the buffer component is (V3-V2), and the volume of fluid 100 quantitatively conveyed by the outlet of the elastic hose 3 is V0=(V1+V3)-(V3-V2)=V1+V2.

[0037] If the volume of fluid 100 pre-stored in the buffer component (V3-V2) is less than V2, i.e., V1+(V3-V2)<V0, then the angle of rotation of the single roller 4 is controlled to be S2, the volume of fluid 100 sucked back by the buffer component is 2×(V3-V2), and the volume of fluid 100 quantitatively delivered by the elastic hose 3 is V0=V1+V2; repeat the above fluid delivery process until the volume of fluid 100 pre-stored in the buffer component is greater than V2.

[0038] By evenly distributing multiple rollers 4 within the housing 101 and placing the elastic hose 3 between the outer periphery of the rollers 4 and the inner wall of the housing 101, the rotation of the rollers 4 achieves hose compression to deliver fluid. By controlling the starting and ending positions of the rollers' quantitative fluid delivery relative to the origin position to remain consistent in each metering cycle, and by utilizing a buffer component at the outlet of the elastic hose to replenish the fluid volume difference or reabsorb excess fluid, the goal of maintaining consistent fluid volume in each metering delivery is achieved. This enables targeted metering delivery based on demand, significantly reduces manufacturing costs, meets the requirements of both small and large load capacities, and ensures high precision. This invention effectively solves the technical problems of large quantitative errors caused by the constantly changing starting and ending positions of the roller compression components and the pulsation phenomenon of the peristaltic pump roller components when leaving the working surface in existing technologies, improving the efficiency of quantitative metering and the stability of the equipment's quantitative transmission.

[0039] Example 1

[0040] like Figure 1 and Figure 2As shown, the rotary quantitative metering device of the present invention is used in the above-mentioned rotary quantitative metering control method. The device includes a housing 101 and a buffer assembly. Multiple rollers 4 are evenly distributed inside the housing 101. Elastic hoses 3 are provided on the outer periphery of each roller 4. The rollers 4 rotate to compress the elastic hoses 3, thereby conveying the fluid 100. The outlet of the elastic hose 3 is inserted into the buffer assembly. The buffer assembly compresses or releases the elastic hose 3 to regulate the output of the fluid 100, thereby achieving quantitative metering and conveying of the fluid 100.

[0041] Furthermore, the buffer assembly includes a lifting pressure plate 1 and a fixed plate 2, which are located on both sides of the elastic hose 3. Under the drive of the drive assembly, the lifting pressure plate 1 moves up and down to get closer to or away from the fixed plate 2, squeezing or releasing the elastic hose 3, and using the elastic deformation of the elastic hose 3 to regulate the output of fluid 100.

[0042] In this embodiment, the fixed plate 2 remains stationary, while the lifting pressure plate 1 can move up and down. The flexible hose 3 is inserted between the lifting pressure plate 1 and the fixed plate 2. The fluid volume in the flexible hose 3 between two adjacent rollers 4 is V3, and there are 6 rollers 4. During the quantitative fluid delivery process, the preset fluid delivery volume is V0. The rollers 4 are controlled to rotate by a corresponding angle S1 to ensure that after the quantitative fluid delivery, one of the rollers 4 returns to its original position, and the actual fluid delivery volume is V1. While the rollers 4 rotate to squeeze the flexible hose for quantitative fluid delivery, the lifting pressure plate 1 is simultaneously driven to descend, squeezing the flexible hose 3 to replenish the difference in fluid volume V2. The final fluid delivery volume is V0 = V1 + V2.

[0043] When it is detected that the elastic hose 3 can still provide the next replenishment volume V2, the control roller 4 continues to rotate by the corresponding angle S1, while the lifting pressure plate 1 continues to descend, squeezing the elastic hose 3 to replenish the fluid volume V2. The final fluid volume delivered is V0 = V1 + V2. This process continues until it is detected that the fluid volume stored in the outlet of the elastic hose 3 is less than V2.

[0044] When the volume of fluid in the elastic hose 3 is insufficient to replenish the difference volume V2 for the next quantitative fluid delivery cycle, the rotation angle of the rotary peristaltic pump roller is controlled to S2, which delivers an additional angle (360° ÷ m) between two rollers compared to S1. S2 = S1 + (360° ÷ m), where m is the number of rollers. After fluid delivery, one roller is ensured to return to its original position, and the additional volume delivered is the fluid volume V3 between the two rollers. During the quantitative fluid delivery by the multi-roller peristaltic pump, the lifting plate 1 is simultaneously driven to rise, and the outlet elastic hose 3 draws back the additional delivered volume (V3 - V2). The quantitatively delivered fluid volume V0 = V1 + V3 - (V3 - V2) = V1 + V2, and the outlet elastic hose 3 stores a fluid volume of (V3 - V2).

[0045] When the volume of fluid stored in the outlet flexible hose 3 is detected to be less than V2, the rotation angle of the roller 4 is controlled to S2, and the lifting pressure plate 1 is driven to continue to rise, ensuring that the outlet of the flexible hose 3 stores fluid of (V3-V2) volume again. This process continues until the volume of fluid stored in the outlet of the flexible hose 3 is detected to be greater than V2.

[0046] In this embodiment, by controlling the starting and ending positions of the rollers in the multi-roller metering device to be consistent with the origin position for each quantitative fluid delivery, and simultaneously driving the lifting plate 1 to descend and squeeze the elastic hose 3 to continuously replenish the fluid volume difference, or driving the lifting plate 1 to rise and the elastic hose 3 to suck back the excess fluid, the volume of fluid delivered by the metering device is consistent each time.

[0047] Example 2

[0048] like Figure 3 and Figure 4 As shown, the rotary quantitative metering device of the present invention is used in the above-mentioned rotary quantitative metering control method. The device includes: a housing 101, a three-way connector 5, a liquid outlet pipe 6, and a buffer assembly. Multiple rollers 4 are evenly distributed inside the housing 101. An elastic hose 3 is provided on the outer periphery of the rollers 4. The rollers 4 rotate to squeeze the elastic hose 3 to realize the delivery of fluid 100. The three-way connector 5 is used to connect the outlet of the elastic hose 3, the liquid outlet pipe 6, and the buffer assembly. The buffer assembly is pre-stored with fluid 100 and is used to regulate the output of fluid 100 to realize the quantitative metering and delivery of fluid 100.

[0049] Furthermore, the buffer assembly includes a positioning seat, a liquid storage hose 8, and clamping rollers 9. The liquid storage hose 8 is straightened and fixed on the positioning seat. The liquid storage hose 8 is connected to the tee connector 5. The clamping rollers 9 are provided on the outside of the liquid storage hose 8. The clamping rollers 9 are controlled to move back and forth along the liquid storage hose 8 so as to realize the fluid 100 being drawn into or expelled from the liquid storage hose 8.

[0050] Furthermore, the positioning seat includes a first positioning seat 7 and a second positioning seat 10. The tee connector 5 is fixed inside the first positioning seat 7, and the second positioning seat 10 is provided with a hose connector 11 for fixing the liquid storage hose 8, which ultimately achieves the straightening and fixing of the liquid storage hose 8 between the first positioning seat 7 and the second positioning seat 10.

[0051] In this embodiment, the three-way connector 5 is connected to the elastic hose 3, the outlet pipe 6, and the storage hose 8, respectively. The three-way hose connector 5 is fixed to the first positioning seat 7, which remains stationary. The lower part of the storage hose 8 is connected to the hose connector 11, which is fixed to the second positioning seat 10, which remains stationary. The storage hose 8 is installed in the middle of the clamping rollers 9, which can vertically reciprocate. The fluid volume between two adjacent rollers is V3, and the number of rollers is 6. During the quantitative fluid delivery process, the preset fluid delivery volume is V0. The rollers 4 are controlled to rotate by a corresponding angle S1 to ensure that after the quantitative fluid delivery, one of the rollers returns to its original position, and the actual fluid delivery volume is V1. During the quantitative fluid delivery, the clamping rollers 9 are simultaneously driven to rise, squeezing the fluid in the storage hose 8 to supplement the difference in fluid volume V2. The final fluid delivery volume is V0 = V1 + V2.

[0052] When it is detected that the fluid in the storage hose 8 can still provide the difference in volume V2 for the next replenishment, the control roller 4 continues to rotate by the corresponding angle S1, while simultaneously driving the clamping roller 9 to continue rising, squeezing the fluid in the storage hose 8 to replenish the difference in fluid volume V2. The final fluid volume delivered is V0 = V1 + V2. This process continues until it is detected that the fluid volume stored in the storage hose 8 is less than V2.

[0053] When it is detected that the fluid volume stored in the reservoir hose 8 is insufficient to replenish the difference volume V2 for the next time, in the next quantitative fluid delivery cycle, the rotation angle of the roller 4 is controlled to be S2. S2 delivers an additional angle between two rollers (360° ÷ m) compared to S1, where S2 = S1 + (360° ÷ m), and m is the number of rollers. After fluid delivery, one of the rollers is ensured to return to its original position, and the additional volume delivered is the fluid volume V3 of the two rollers. During the quantitative fluid delivery, the clamping roller 9 is simultaneously driven to descend, causing the reservoir hose 8 to draw back the additional delivered volume (V3 - V2). The quantitatively delivered fluid volume V0 = V1 + V3 - (V3 - V2) = V1 + V2; at the same time, the reservoir hose 8 stores a fluid volume of (V3 - V2). When the volume of fluid stored in the reservoir hose 8 is detected to be less than V2, the rotation angle of the roller 4 is controlled to S2, and the clamping roller 9 is driven to continue to descend, ensuring that the reservoir hose 8 stores another volume of fluid (V3-V2). This process continues until the volume of fluid stored in the reservoir hose 8 is detected to be greater than V2.

[0054] In this embodiment, by controlling the starting and ending positions of the rollers in the rotary metering device to keep the fluid delivery volume consistent with the origin position each time, and simultaneously driving the clamping rollers 9 to rise and squeeze the liquid storage hose 8 to continuously replenish the fluid volume difference, or driving the clamping rollers 9 to fall and the liquid storage hose 8 to suck back the excess fluid, the rotary metering device achieves consistent fluid delivery volume each time.

[0055] Example 3

[0056] like Figure 5 and Figure 6 As shown, the rotary quantitative metering device of the present invention is used in the above-mentioned rotary quantitative metering control method. The metering device in this embodiment has a similar structure and working principle to the metering device in embodiment 1. The main difference is that only a single roller 4 is provided in the housing 101, and the fluid metering and conveying is achieved by the rotation and squeezing of the single roller 4.

[0057] Specifically, the metering device includes a housing 101 and a buffer assembly. A roller 4 is arranged inside the housing 101, and a spiral elastic hose 3 is provided on the outer periphery of the roller 4. The roller 4 rotates around the center to compress the elastic hose 3, thereby realizing the delivery of fluid 100. The outlet of the elastic hose 3 is inserted into the buffer assembly. The buffer assembly compresses or releases the elastic hose 3 to regulate the output of fluid 100, thereby realizing the quantitative metering and delivery of fluid 100.

[0058] Further, the buffer assembly includes a lifting pressure plate 1 and a fixed plate 2, which are located on both sides of the elastic hose 3. Driven by the drive assembly, the lifting pressure plate 1 moves up and down to approach or move away from the fixed plate 2, squeezing or releasing the elastic hose 3. The output of fluid 100 is controlled by the elastic deformation of the elastic hose 3. In this embodiment, the fixed plate 2 is fixed, while the lifting pressure plate 1 can move up and down. The elastic hose 3 is inserted between the lifting pressure plate 1 and the fixed plate 2. The fluid volume of one rotation of the roller 4 is V3, and there is one roller 4. During the quantitative fluid delivery process, the preset fluid volume is V0. The roller 4 is controlled to rotate by a corresponding angle S1 to ensure that after the quantitative fluid delivery, the roller 4 returns to its original position, and the actual fluid volume delivered is V1. During the rotation of the roller 4 to squeeze the elastic hose for quantitative fluid delivery, the lifting pressure plate 1 is simultaneously driven to descend, squeezing the elastic hose 3 to supplement the difference in fluid volume V2. The final fluid volume delivered is V0 = V1 + V2.

[0059] When it is detected that the elastic hose 3 can still provide the next replenishment volume V2, the control roller 4 continues to rotate by the corresponding angle S1, while the lifting pressure plate 1 continues to descend, squeezing the elastic hose 3 to replenish the fluid volume V2. The final fluid volume delivered is V0 = V1 + V2. This process continues until it is detected that the fluid volume stored in the outlet of the elastic hose 3 is less than V2.

[0060] When the volume of fluid in the elastic hose 3 is insufficient to replenish the difference volume V2 for the next quantitative fluid delivery cycle, the rotation angle of the rotary peristaltic pump roller is controlled to S2, which is 360° more than S1, where S2 = S1 + 360°. After fluid delivery, the position of roller 4 is ensured to return to its original position, and the extra volume delivered is the fluid volume of one rotation of roller 4, which is V3. During the quantitative fluid delivery by the roller peristaltic pump, the lifting plate 1 is simultaneously driven to rise, and the outlet elastic hose 3 draws back the extra delivered volume (V3 - V2). The quantitatively delivered fluid volume V0 = V1 + V3 - (V3 - V2) = V1 + V2, and at the same time, the outlet elastic hose 3 stores a volume of fluid of (V3 - V2).

[0061] When the volume of fluid stored in the outlet flexible hose 3 is detected to be less than V2, the rotation angle of the roller 4 is controlled to S2, and the lifting pressure plate 1 is driven to continue to rise, ensuring that the outlet of the flexible hose 3 stores fluid of (V3-V2) volume again. This process continues until the volume of fluid stored in the outlet of the flexible hose 3 is detected to be greater than V2.

[0062] In this embodiment, by controlling the starting and ending positions of the rollers in the single roller metering device to be consistent with the origin position for each quantitative fluid delivery, and simultaneously driving the lifting plate 1 to descend and squeeze the elastic hose 3 to continuously replenish the fluid volume difference, or driving the lifting plate 1 to rise and the elastic hose 3 to suck back the excess fluid, the volume of fluid delivered by the metering device is consistent each time.

[0063] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the spirit and technical essence of the invention. Therefore, any simple modifications, equivalent substitutions, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, shall still fall within the scope of protection of the present invention.

Claims

1. A rotary quantitative measurement and control method, characterized in that: There are m rollers (4) evenly distributed inside the housing (101), where m is a positive integer and m≥1; the elastic hose (3) is wrapped around the outer circumference of the rollers (4), and the fluid (100) flows inside the elastic hose (3). One end of the elastic hose (3) is the inlet, which is used to draw in the fluid (100), and the other end of the elastic hose (3) is the outlet, which is used to discharge the fluid (100); the outlet of the elastic hose (3) is provided with a buffer component, which pre-stores the fluid (100). The buffer component is used to regulate the output of the fluid (100) so as to realize the quantitative metering and delivery of the fluid (100); In one metering cycle of the roller (4) rotating to squeeze the elastic hose (3) to transport fluid (100), the preset transport volume of fluid (100) is V0, the preset rotation angle of a single roller (4) is S1, the value of S1 is a positive integer multiple of (360°÷m), the transport volume of fluid is V1, after completing one fluid metering transport, any one of the rollers (4) returns to the origin position marked on the housing (101), so that in any metering cycle, the starting position and the ending position of the roller rotation to quantitatively transport fluid are kept consistent with the origin; If the actual transport volume V1 of the fluid (100) is less than the preset transport volume V0, the buffer component is squeezed to supplement the difference volume V2 so as to achieve V1+V2=V0; If the volume V22 of the fluid (100) pre-stored in the buffer component is less than V2, and V1+V22<V0, then the angle of rotation of the single roller (4) is S2, S2= S1+(360°÷m), and the conveying volume of the fluid (100) is (V1+V3), where V3 is the fluid volume in the elastic hose (3) between two adjacent rollers (4); the volume of the fluid (100) simultaneously drawn back by the buffer component is (V3-V2), and the volume of the fluid (100) quantitatively conveyed by the elastic hose (3) is V0=(V1+V3)-(V3-V2)=V1+V2.

2. The rotary quantitative measurement and control method according to claim 1, characterized in that, If the volume V21 of the fluid (100) pre-stored in the buffer component is greater than V2, then control the roller (4) to rotate by an angle S1 and simultaneously squeeze the buffer component to supplement the difference in volume V2, so as to achieve V1+V2=V0; The cycle continues until the volume of fluid stored in the buffer component is less than V2.

3. The rotary quantitative measurement and control method according to claim 1, characterized in that, If the volume (V3-V2) of the fluid (100) pre-stored in the buffer component is less than V2, and V1+(V3-V2)<V0, then the angle of rotation of the single roller (4) is controlled to be S2, the volume of fluid (100) sucked back by the buffer component is 2×(V3-V2), and the volume of fluid (100) quantitatively delivered by the elastic hose (3) is V0=V1+V2; repeat the above fluid delivery process until the volume of fluid (100) pre-stored in the buffer component is greater than V2.

4. A rotary quantitative measuring device for implementing the rotary quantitative measuring control method according to claim 1, characterized in that, include: The system comprises a housing (101), a three-way connector (5), an outlet pipe (6), and a buffer assembly. The housing (101) contains multiple rollers (4), and each roller (4) has an elastic hose (3) on its outer periphery. The rollers (4) rotate to compress the elastic hose (3) to deliver fluid (100). The three-way connector (5) is used to connect the outlet of the elastic hose (3), the outlet pipe (6), and the buffer assembly. The buffer assembly contains pre-stored fluid (100) and is used to regulate the output of fluid (100) to achieve quantitative metering and delivery of fluid (100).

5. The rotary quantitative measuring device according to claim 4, characterized in that, The buffer assembly includes a positioning seat, a liquid storage hose (8), and clamping rollers (9); the liquid storage hose (8) is straightened and fixed on the positioning seat, the liquid storage hose (8) is connected to the tee connector (5), and clamping rollers (9) are provided on the outside of the liquid storage hose (8). The clamping rollers (9) are controlled to move back and forth along the liquid storage hose (8) so as to realize the suction or expulsion of fluid (100) from the liquid storage hose (8).

6. The rotary quantitative measuring device according to claim 5, characterized in that, The positioning seat includes a first positioning seat (7) and a second positioning seat (10). The three-way connector (5) is fixed inside the first positioning seat (7). The second positioning seat (10) is provided with a hose connector (11) for fixing the liquid storage hose (8).

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