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CN-117307455-B - Rotary quantitative metering control method and metering device

CN117307455BCN 117307455 BCN117307455 BCN 117307455BCN-117307455-B

Abstract

The invention discloses a rotary quantitative metering control method and a metering device, wherein m rollers are uniformly distributed in a shell, m is a positive integer greater than 1, an elastic hose is wound on the periphery of the rollers, fluid flows in the elastic hose, a buffer assembly is arranged at an outlet of the elastic hose, fluid is pre-stored in the buffer assembly, the rollers rotate and squeeze the elastic hose to convey the fluid, the conveying volume of the preset fluid is V0 in one metering cycle, the rotating angle of the rollers is S1, the S1 value is a positive integer multiple of (360 DEG/m), the conveyed fluid volume is V1, one roller returns to the original point position on the shell after one metering conveying is finished, the starting point and the end point position of the quantitatively conveyed fluid are consistent relative to the original point in any metering cycle, and if V1 is smaller than V0, the buffer assembly is squeezed to supplement the differential volume V2, so that V0 = V1+ V2. The invention has the advantages of simple control, high metering precision, high filling efficiency and the like.

Inventors

  • LIU ZHEN
  • YANG BO
  • ZHAO GUOQIANG
  • LIAO CHUN

Assignees

  • 湖南执先科技有限公司

Dates

Publication Date
20260505
Application Date
20230823

Claims (6)

  1. 1. A rotary quantitative metering control method is characterized in that m rollers (4) are uniformly distributed in a shell (101), m is a positive integer and is more than or equal to 1, an elastic hose (3) is wound on the periphery of the rollers (4), fluid (100) flows in the elastic hose (3), one end of the elastic hose (3) is an inlet and is used for sucking the fluid (100), the other end of the elastic hose (3) is an outlet and is used for discharging the fluid (100), a buffer assembly is arranged at the outlet of the elastic hose (3), the buffer assembly is pre-stored with the fluid (100), and the buffer assembly is used for regulating and controlling the output quantity of the fluid (100) so as to realize quantitative metering conveying of the fluid (100); In one metering cycle of the roller (4) rotating and extruding the elastic hose (3) to convey the fluid (100), presetting the conveying volume of the fluid (100) as V0, presetting the rotation angle of a single roller (4) as S1, presetting the S1 value as positive integer multiple of (360 DEG/m), and after the conveyed fluid volume as V1, finishing one-time metering conveying, wherein any roller (4) returns to the original point position marked on the shell (101) to realize that the starting point position and the end point position of the quantitatively conveyed fluid are consistent relative to the original point in any metering cycle; If the actual delivery volume V1 of the fluid (100) is less than the preset delivery volume V0, squeezing the buffer assembly to supplement the differential volume V2 to achieve v1+v2=v0; If the volume V22 of the fluid (100) pre-stored in the buffer assembly is smaller than V2, V1+V22< V0, controlling the rotation angle of the single roller (4) to be S2, S2=S1+ (360 degrees/m), and the conveying volume of the fluid (100) to be (V1 +V 3), wherein V3 is the fluid volume in the elastic hose (3) between two adjacent rollers (4), the volume of the fluid (100) sucked back by the buffer assembly is (V3-V2), and the volume V0 of the fluid (100) quantitatively conveyed by the elastic hose (3) = (V1 +V 3) - (V3-V2) =V 1+V2.
  2. 2. The rotary quantitative metering control method according to claim 1, wherein if the volume V21 of the fluid (100) pre-stored in the buffer assembly is greater than V2, the roller (4) is controlled to rotate by an angle S1 and simultaneously squeeze the buffer assembly to supplement the differential volume V2 to achieve v1+v2=v0, and the next metering cycle is entered until the volume of the fluid pre-stored in the buffer assembly is detected to be less than V2.
  3. 3. The rotary quantitative metering control method according to claim 1, wherein if the volume (V3-V2) of the fluid (100) pre-stored in the buffer unit is smaller than V2, v1+ (V3-V2) < V0, the rotation angle of the single roller (4) is controlled to be S2, the volume of the fluid (100) sucked back by the buffer unit is 2× (V3-V2), v0=v1+v2 of the fluid (100) quantitatively delivered by the flexible tube (3), and the fluid delivery process is repeated until the volume of the fluid (100) pre-stored in the buffer unit is larger than V2.
  4. 4. A rotary quantitative metering device for implementing the rotary quantitative metering control method according to claim 1 is characterized by comprising a shell (101), a tee joint (5), a liquid outlet pipe (6) and a buffer assembly, wherein a plurality of rollers (4) are uniformly distributed in the shell (101), elastic hoses (3) are arranged on the peripheries of the rollers (4), the rollers (4) rotate to extrude the elastic hoses (3) to realize fluid (100) delivery, the tee joint (5) is used for realizing the communication of an outlet of the elastic hoses (3), the liquid outlet pipe (6) and the buffer assembly, the buffer assembly is pre-stored with the fluid (100), and the buffer assembly is used for regulating and controlling the output quantity of the fluid (100) to realize the quantitative metering delivery of the fluid (100).
  5. 5. The rotary quantitative metering device according to claim 4, wherein the buffer assembly comprises a positioning seat, a liquid storage hose (8) and a butt clamp roller (9), the liquid storage hose (8) is straightened and fixed on the positioning seat, the liquid storage hose (8) is communicated with the three-way joint (5), the butt clamp roller (9) is arranged on the outer side of the liquid storage hose (8), and the butt clamp roller (9) is controlled to reciprocate along the liquid storage hose (8) so as to suck or extrude fluid (100) into the liquid storage hose (8).
  6. 6. The rotary quantitative metering device according to claim 5, wherein the positioning seats comprise a first positioning seat (7) and a second positioning seat (10), the three-way joint (5) is fixed in the first positioning seat (7), and a hose joint (11) for fixing a liquid storage hose (8) is arranged in the second positioning seat (10).

Description

Rotary quantitative metering control method and metering device Technical Field The invention belongs to the technical field of fluid conveying, and particularly relates to a rotary quantitative metering control method and a metering device. Background At present, in the field of fluid delivery pumps, the traditional peristaltic pump is widely applied to various industries including chemical industry, pharmaceutical industry, food filling industry and the like due to the advantages of no pollution, strong self-priming capability, simple structure, good accuracy and the like. Peristaltic pumps are like squeezing a fluid filled hose with fingers, and as the fingers slide forward, the fluid in the tube moves forward. In peristaltic pumps only, the fingers are replaced by rollers. The elastic conveying hose in the peristaltic pump is alternately extruded and released to pump fluid, and the roller extrudes the elastic hose and rotates just like the extrusion of the hose by two fingers, so that two cavities of positive pressure and negative pressure are formed in the hose, and the fluid flows and is discharged. Among them, the peristaltic pump is mainly used for transporting fluid by adopting a mode of rolling and extruding hoses by a plurality of groups of rollers, and the quantitative transportation of the fluid is one of the main applications of the peristaltic pump. The conventional peristaltic pump fluid quantitative conveying function obtains approximately the same liquid distribution amount by controlling the motor to rotate for the same number of turns. Under the condition of fixed rotating speed, the motor rotates for the same number of times within the same time interval, the roller extrusion part is driven to rotate and extrude the elastic hose, and the stop point position of the roller extrusion part is the starting point position of the next quantitative fluid delivery, so that the starting point position and the stop point position of the roller extrusion part are continuously changed, and the position of the roller extrusion part is also continuously changed when the outlet end leaves the working surface. However, the peristaltic pump has pulsation phenomenon in the operation process, when the roller extrusion part leaves the working surface at the outlet end, the occupied volume can be suddenly and instantaneously released, the liquid flow at the outlet end is instantaneously reduced, and even the problem of liquid back suction occurs. And, the larger the hose internal diameter, the larger the volume that one extrusion part invades on the hose, and the more obvious the flow pulsation phenomenon that the outlet end produced. Due to the existence of pulsation phenomenon, the position of the roller extrusion part is also changed continuously when the outlet end leaves the working surface, so that the fluid quantity conveyed in the same time interval under the condition of fixed rotating speed can have deviation of the volume occupied by one roller extrusion part on the hose, and the fluid conveying quantity is different. In the prior art, in order to ensure the accuracy of quantitatively conveying fluid by a peristaltic pump and reduce flow deviation, a hose with smaller inner diameter is adopted in a common practice. The method has the problems that the same liquid amount is transmitted, the rotation number of the hose with smaller diameter is required to be increased, the filling time is prolonged, the efficiency is reduced, the extrusion frequency of the hose is increased, the service life of the hose is obviously shortened, and the quantitative transmission stability of the peristaltic pump is reduced. Disclosure of Invention The invention aims to solve the technical problems of large quantitative error caused by the fluctuation phenomenon of a peristaltic pump roller component when leaving a working surface due to the fact that the starting position and the end position of the roller extrusion component are continuously changed in the prior art, and provides a rotary quantitative metering control method and a metering device which are compact in structure, simple to control, high in metering precision and high in filling efficiency. In order to solve the technical problems, the invention adopts the following technical scheme: The rotary quantitative metering control method comprises the steps that m rollers are uniformly distributed in a shell, m is a positive integer, and m is more than or equal to 1, an elastic hose is wound on the periphery of the rollers, fluid flows in the elastic hose, one end of the elastic hose is an inlet and is used for sucking the fluid, and the other end of the elastic hose is an outlet and is used for discharging the fluid, a buffer assembly is arranged at the outlet of the elastic hose, the buffer assembly is pre-stored with the fluid, and the buffer assembly is used for regulating and controlling the output quantity of the fluid so as to realize quantitative meter