CN101458535A - Programmed control constant speed quantitative liquid feeding control system - Google Patents
Programmed control constant speed quantitative liquid feeding control system Download PDFInfo
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- CN101458535A CN101458535A CNA2008102427148A CN200810242714A CN101458535A CN 101458535 A CN101458535 A CN 101458535A CN A2008102427148 A CNA2008102427148 A CN A2008102427148A CN 200810242714 A CN200810242714 A CN 200810242714A CN 101458535 A CN101458535 A CN 101458535A
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Abstract
The invention relates to a program control constant-speed and fixed amount feed liquid control system which belongs to the electron technique and automatic control field. The system has main characteristics of using dual-CPU program control electrical power source structure that is composed of a host PC computer, a lower singlechip, a flow rate sensor, a temperature sensor, a transducer, an electromagnetic valve, an A/D convertor, a D/A convertor, a serial communication, amplify process and control driving circuit. Fluid feed of the system can be adjusted continuously, precision of constant-speed and fixed amount feed liquid control and temperature collecting reaches to +1/-1%, the system is suitable for feed liquid occasion that needs providing wide liquid feed range, continuous and adjustable fluid. The system has characteristics of high precision, better stability, high efficiency and energy saving, better real time monitoring effect, simple operation, and can be widely used in using liquid fields such as modernized food beverage process, medicament and industry.
Description
Technical field
The present invention relates to a kind of programmed control constant speed quantitative liquid feeding control system, system is applicable to need provide wide feed flow scope, flow is adjustable continuously, the feed flow occasion of constant flow rate, have performances such as degree of accuracy height, good stability, energy-efficient, real-time monitoring effect be good, easy and simple to handle, belong to electronic technology and automatic control technology field.
Background technology
Pollution-free environment-friendly products such as pollution-free food, beverage, medical health care drug become the focus of consumption.But use in the liquid field at some modernized food and drink processing, medicine and chemical industry etc., exist liquid supply rate out of true and feed flow flow velocity shakiness that product quality is had the problem of considerable influence, press for provide can constant speed, quantitatively, good stability, precision height, the feed flow that can monitor in real time.Yet, because the diversity of actual request for utilization, still lack at present and a kind ofly can adapt to that wide feed flow scope, flow are controlled, constant flow rate, control accuracy height, good, the real-time monitoring effect of system stability is good, real time data is directly perceived with curve display, measurement data is preserved, easy and simple to handle, cost is low, the while can measure the temperature of a liquid programmed control constant speed quantitative liquid feeding system.
Summary of the invention
The present invention is directed to that the existing liquid feed device in market can not possess wide feed flow scope simultaneously, flow is adjustable continuously, highly sensitive, constant flow rate, fluid temperature are measured, monitoring in real time, measurement data is preserved and function such as intuitive display, and control accuracy and stiffness of system can not satisfy the deficiency of actual request for utilization, and a kind of programmed control constant speed quantitative liquid feeding control system is provided.
The objective of the invention is to be achieved through the following technical solutions, a kind of programmed control constant speed quantitative liquid feeding control system is characterized in that, described control system adopts two CPU programmable power supply structures; The monitoring human-computer interface of upper PC, upper PC; A/D converter, D/A converter, control Driver Circuit that the next single-chip microcomputer, the next single-chip microcomputer connect; Serial communication circuit between the two CPU of upper and lower machine; The flow sensor that is positioned at the liquid outlet pipeline and temperature sensor are connected with signal processing circuit separately respectively, and the output of its signal processing circuit links to each other with the input end of multi-channel a/d converter respectively; The control end of the output termination frequency converter of D/A converter, the output of frequency converter links to each other with pump motor; Pump entrance links to each other with the liquid inlet pipeline, and its outlet links to each other with electromagnetic valve entrance, and electromagnetic valve outlet links to each other with the liquid outlet pipeline, and the control end of solenoid valve links to each other with the control Driver Circuit output terminal.
The next single-chip microcomputer adopts MCS-51 system single-chip microcomputer, adopts the RS232 interface circuit with communicating by letter between the upper PC, and the next single-chip microcomputer receives liquid supply rate and the feed flow time data from the signal that brings into operation of host computer, signal out of service, setting; After bringing into operation, the feed flow flow that the next single-chip microcomputer calculates system according to the liquid supply rate of setting and feed flow time data, D/A converter through 12 converts simulating signal to, send into the control end of frequency converter, control the rotating speed of pump motor by frequency converter, frequency converter has stepless frequency control, soft start, soft stopping and various defencive function, realizes that pump motor is in energy-efficient operation down; Signal sensed from flux is by after the high-precision low-drift operational amplifier processing and amplifying, convert the corresponding digital amount to through 12 A/D converters, send into the I/O mouth of single-chip microcomputer, single-chip microcomputer obtains data on flows in real time, and according to the margin of error of setting value, the control signal of frequency converter is regulated real time altering frequency converter output frequency and output voltage, the rotation speed change of control pump motor realizes the programmed control constant speed feed flow; Single-chip microcomputer is according to feed flow flow and the measurement data of feed flow time statistics liquid supply rate, compare with setting value, when near setting value, the input signal of control of conversion device, make linear decline of rotating speed of pump motor, in case reach setting value, single-chip microcomputer sends signal and gives frequency converter, and the feed flow pump motor is stopped operating, output simultaneously stops the feed flow signal, closed electromagnetic valve by control Driver Circuit will link to each other with the feed flow outlet conduit stops feed flow, realizes quantitative liquid feeding; The next single-chip microcomputer is measured in real time to fluid temperature, the simulating signal of temperature sensor is after high-precision low-drift operational amplifier processing and amplifying, convert the corresponding digital amount to by 12 A/D converters, send into the I/O mouth of single-chip microcomputer, single-chip microcomputer obtains temperature data in real time; Liquid supply rate and fluid temperature data that the next single-chip microcomputer will be measured in real time by the RS232 interface send to host computer.
Host computer is under the support of the special-purpose general switching software of liquid-supplying system, have and select parameter to set, show in real time measurement data and liquid supply rate--time, fluid temperature--the time relation curve of liquid supply rate, fluid temperature, press default path and preserve the measurement data function liquid supply rate, feed flow time and serial ports.
The present invention adopts Frequency Conversion and Speed Regulation Technique to regulate the variation of feed flow flow velocity.The next single-chip microcomputer is accepted liquid supply rate and the feed flow time set value from upper PC, calculates the feed flow flow setting value, converts simulating signal to by D/A converter, as the control signal of frequency converter, and the rotating speed of control pump motor.Signal sensed from flux in liquid-supplying system is after processing and amplifying and A/D conversion, send into the I/O mouth of single-chip microcomputer, realize the measurement of fluid flow, single-chip microcomputer calculates the error with setting value, according to the margin of error control signal of frequency converter is regulated, real time altering frequency converter output frequency and output voltage are accurately controlled the rotation speed change of pump motor, realize the constant speed feed flow.Single-chip microcomputer real-time statistics liquid supply rate, when near setting value, the control of conversion device makes the linear decline of the rotating speed of pump motor, in case reach setting value, stops the feed flow motor and rotates, and closes solenoid valve simultaneously, stops feed flow, realizes quantitative liquid feeding.In addition, single-chip microcomputer obtains the temperature sensor signal in the liquid-supplying system, can measure fluid temperature.Native system feed flow flow can be adjustable continuously, and constant speed quantitative liquid feeding is controlled and the precision of temperature acquisition reaches ± and 1 ‰.The present invention has wide feed flow scope, the feed flow flow is adjustable continuously, control accuracy is high, system stability is good, fluid temperature is measured, show liquid supply rate and temperature test data and curve in real time, preservation measurement data, energy-efficient, easy and simple to handle, characteristics such as cost is low, can be widely used in modernized food and drink processing, medicine and industry etc. and use the liquid field.
Description of drawings
Fig. 1 is a principle of the invention block diagram;
Fig. 2 is a PC monitoring interface of the present invention.
Embodiment
Further specify the present invention in conjunction with the accompanying drawings and embodiments, as shown in Figure 1, the program control micro-liquid feeding control system of high precision provided by the invention, high stability comprises following two parts:
(1) host computer is a PC, carries out the setting of liquid supply rate and feed flow time parameter by programmed control constant speed quantitative liquid feeding system-specific software, by the RS232 interface setting data is sent to slave computer.The feed flow flow and the fluid temperature data of the real-time measurement of accepting from slave computer, send to host computer by the RS232 interface, after system software is handled, the measurement data of its liquid supply rate and fluid temperature is presented at the PC monitoring human-computer interface in real time with numeral and curve form, and its test data is carried out data by default path and preserved.Host computer possesses also that serial ports is selected, brought into operation, function such as out of service, as shown in Figure 2.
(2) slave computer is a MCS-51 system single-chip microcomputer, obtains the setting value of feed flow flow from host computer, converts analog quantity to through D/A converter, as the control signal of frequency converter, by the rotating speed of the output control pump motor of frequency converter.Signal sensed from flux in liquid-supplying system is after processing and amplifying and A/D conversion, send into the I/O mouth of single-chip microcomputer, realize the measurement of fluid flow, single-chip microcomputer according to the margin of error of setting value, control signal to frequency converter is carried out real-time regulated, accurately the rotation speed change of control pump motor realizes the programmed control constant speed feed flow; Single-chip microcomputer real-time statistics liquid supply rate, when near setting value, the control of conversion device makes the linear decline of the rotating speed of pump motor, in case reach setting value, stops the feed flow motor rotation, closes solenoid valve simultaneously, stops feed flow, realizes quantitative liquid feeding.Temperature sensor signal in liquid-supplying system is sent into the I/O mouth of single-chip microcomputer after processing and amplifying and A/D conversion, realize the measurement of fluid temperature.
Serial communication circuit among the present invention between the two CPU of related A/D conversion, D/A conversion, signal processing circuit, control Driver Circuit and upper and lower machine all can adopt existing mature technology, ripe circuit.
Experimentation
Press Fig. 1 PC, frequency converter, water pump, solenoid valve, flow sensor, temperature sensor, liquid inlet pipeline and liquid outlet pipeline etc. are connected, set up program control liquid-supplying system.Preestablish converter parameter, control mode and Starting mode earlier, on PC, open the special software of this liquid-supplying system then, on monitoring interface, parameters such as liquid supply rate, feed flow time, serial ports selection are set, open frequency converter and liquid feeding control system again, behind the key of clicking on the monitoring interface that brings into operation, the automatic constant speed quantitative liquid feeding of system, automatically carry out the monitoring of real-time liquid supply rate and fluid temperature, the measurement data and the curve that show liquid supply rate--time, fluid temperature--time in real time, except automatic operation stops, can also be manually out of service.
Claims (3)
1, a kind of programmed control constant speed quantitative liquid feeding control system is characterized in that, described control system adopts two CPU programmable power supply structures; The monitoring human-computer interface of upper PC, upper PC; A/D converter, D/A converter, control Driver Circuit that the next single-chip microcomputer, the next single-chip microcomputer connect; Serial communication circuit between the two CPU of upper and lower machine; The flow sensor that is positioned at the liquid outlet pipeline and temperature sensor are connected with signal processing circuit separately respectively, and the output of its signal processing circuit links to each other with the input end of multi-channel a/d converter respectively; The control end of the output termination frequency converter of D/A converter, the output of frequency converter links to each other with pump motor; Pump entrance links to each other with the liquid inlet pipeline, and its outlet links to each other with electromagnetic valve entrance, and electromagnetic valve outlet links to each other with the liquid outlet pipeline, and the control end of solenoid valve links to each other with the control Driver Circuit output terminal.
2, programmed control constant speed quantitative liquid feeding control system according to claim 1, it is characterized in that the next single-chip microcomputer adopts MCS-51 system single-chip microcomputer, adopt the RS232 interface circuit with communicating by letter between the upper PC, the next single-chip microcomputer receives liquid supply rate and the feed flow time data from the signal that brings into operation of host computer, signal out of service, setting; After bringing into operation, the feed flow flow that the next single-chip microcomputer calculates system according to the liquid supply rate of setting and feed flow time data, D/A converter through 12 converts simulating signal to, send into the control end of frequency converter, control the rotating speed of pump motor by frequency converter, frequency converter has stepless frequency control, soft start, soft stopping and various defencive function, realizes that pump motor is in energy-efficient operation down; Signal sensed from flux is by after the high-precision low-drift operational amplifier processing and amplifying, convert the corresponding digital amount to through 12 A/D converters, send into the I/O mouth of single-chip microcomputer, single-chip microcomputer obtains data on flows in real time, and according to the margin of error of setting value, the control signal of frequency converter is regulated real time altering frequency converter output frequency and output voltage, the rotation speed change of control pump motor realizes the programmed control constant speed feed flow; Single-chip microcomputer is according to feed flow flow and the measurement data of feed flow time statistics liquid supply rate, compare with setting value, when near setting value, the input signal of control of conversion device, make linear decline of rotating speed of pump motor, in case reach setting value, single-chip microcomputer sends signal and gives frequency converter, and the feed flow pump motor is stopped operating, output simultaneously stops the feed flow signal, closed electromagnetic valve by control Driver Circuit will link to each other with the feed flow outlet conduit stops feed flow, realizes quantitative liquid feeding; The next single-chip microcomputer is measured in real time to fluid temperature, the simulating signal of temperature sensor is after high-precision low-drift operational amplifier processing and amplifying, convert the corresponding digital amount to by 12 A/D converters, send into the I/O mouth of single-chip microcomputer, single-chip microcomputer obtains temperature data in real time; Liquid supply rate and fluid temperature data that the next single-chip microcomputer will be measured in real time by the RS232 interface send to host computer.
3, programmed control constant speed quantitative liquid feeding control system according to claim 1, it is characterized in that, host computer is under the support of the special-purpose general switching software of liquid-supplying system, have and select parameter to set, show in real time measurement data and liquid supply rate--time, fluid temperature--the time relation curve of liquid supply rate, fluid temperature, press default path and preserve the measurement data function liquid supply rate, feed flow time and serial ports.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008102427148A CN101458535A (en) | 2008-12-15 | 2008-12-15 | Programmed control constant speed quantitative liquid feeding control system |
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| CNA2008102427148A CN101458535A (en) | 2008-12-15 | 2008-12-15 | Programmed control constant speed quantitative liquid feeding control system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102141807A (en) * | 2011-04-22 | 2011-08-03 | 柳州五菱汽车有限责任公司 | Upper computer, lower computer, monitoring system and method |
| CN102183974A (en) * | 2011-03-07 | 2011-09-14 | 福建省长汀金龙烯土有限公司 | System and method for accurately controlling flow of rare earth material |
| CN102338647A (en) * | 2011-09-27 | 2012-02-01 | 中国人民解放军总装备部军械技术研究所 | Device for automatically acquiring characteristic information of equipment |
| CN104148217A (en) * | 2014-08-07 | 2014-11-19 | 成都信鑫信息技术有限公司 | Full-automatic accurate pesticide variable-flow spray control system |
| CN105487561A (en) * | 2016-01-26 | 2016-04-13 | 上海应用技术学院 | Peristaltic pump flow control system based on LabVIEW fuzzy PID controller |
-
2008
- 2008-12-15 CN CNA2008102427148A patent/CN101458535A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102183974A (en) * | 2011-03-07 | 2011-09-14 | 福建省长汀金龙烯土有限公司 | System and method for accurately controlling flow of rare earth material |
| CN102141807A (en) * | 2011-04-22 | 2011-08-03 | 柳州五菱汽车有限责任公司 | Upper computer, lower computer, monitoring system and method |
| US8955101B2 (en) | 2011-04-22 | 2015-02-10 | Liuzhou Wuling Motors Co., Ltd. | Upper-order computer, lower-order computer, monitoring system and monitoring method |
| CN102338647A (en) * | 2011-09-27 | 2012-02-01 | 中国人民解放军总装备部军械技术研究所 | Device for automatically acquiring characteristic information of equipment |
| CN104148217A (en) * | 2014-08-07 | 2014-11-19 | 成都信鑫信息技术有限公司 | Full-automatic accurate pesticide variable-flow spray control system |
| CN105487561A (en) * | 2016-01-26 | 2016-04-13 | 上海应用技术学院 | Peristaltic pump flow control system based on LabVIEW fuzzy PID controller |
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Open date: 20090617 |