The Development Of Metric Pump Mechatronics Control System

Metric pump is a kind of machinery that has the function of transporting the medium and adjusting the flux. So it is suitable to be as an executive component that is used in the process of control system which need transport all kinds of liquid media. But it is difficult for the traditional metric pump to adjust the precision of flux to satisfy the automatization needs of controlling the flow of the modernization mass production technics, especially in the measurement of the nocuous liquid and the adjustment under dangerous environment. The traditional device has more problems, so it is very necessary that metric pump realize the auto-control, real time monitoring, and precise modulation.In order to solve the above problems, the single-chip microcomputer technique is adopted, AT89C52 chip is used as control kernel, various anti-disturb measures are considered, and the control and transmission parts of the metric pump are altered correspondently, and then the metric pump mechatronics control system is developed.The development of the control system is mainly composed of the design of mechanically-driven device and hardware and software of the circuit. The mechanically-driven device adopts step motor to drive a pair of speed-down gears, and then drive the axis to rotate with gears, which lead the screw move through sliding key to realize the regulation to the metric pump.AT89C52 is adopted as main CMOS chip in the hardware of circuit which communicate with AT89C2051 to produce controlling signal in order to control step motors, and C language is adopted in software. Because it has the advantageous modularization programme technology, the new program can be planted easily and the time of programme and the adjustment of the process can be cut down remarkably.This control system has two sets of control schemes: automatic control and manual control. Through pressing switch keys, they can be switched easily. In the manual control condition, the value of flux can be input through the keyboard straightly. While in the automatism control condition, with A/D conversion component, the system converses the 4～20mA analog current signals into digital signals to realize the flow control.