| Emulsion pump is power resource of hydraulic pressure bracket system, its work without accident can ensure that mining work and production continue safely in fully mechanized mining face. Development of electro-hydraulic unloading and supervisory control system of emulsion pump aims at controlling the unloading of emulsion pump, and supervising and controlling emulsion pump parameters, and ensuring the hydraulic pressure bracket system works without accident.According to PIC16F877 single-chip microcomputer sensor technology electronic technology testing technology and electro-hydraulic control technology , we developed the supervisory control system of single-chip microcomputer. In this system, according to the work characteristic of emulsion pump, sensor is used to test the work pressure of emulsion pump and the single chip is used to control the unloading of emulsion pump, so emulsion pump can be controlled to work within setting pressure. Making use of temperature sensor and switch which measures liquid level by floating ball and signal modulation circuit, we realized the live supervisory control of the oil temperature and level of emulsion pump crankcase, the liquid temperature and level of emulsion pump box. When one parameter overruns the limit, operators can be reminded by the alarm of sound and light. Optoelectronic isolation technology is adopted to deal with the controlling and driving problem of large power loading electromagnetism control valve, the problem of supervising the value of liquid level switch is approached, too, and the anti-disturbance ability of the system was improved. LED can live display pressure and temperature. Unloading pressure and value of alarm parameter of emulsion pump can be adjusted by stroking keys. Based on the overall design of system, this paper discusses the measurement means of non-electronic parameters and the design of hardware circuit, and introduces the software design of system, anti-jamming design...
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