Abstract

In this paper, a new type of motor-controlled unloading valve for high-pressure and large-flow hydraulic system of coal mining is reported. Here the motor-controlled unloading valve can control the pressure and flow of the emulsion pump, so as to the unloading and pressure building of the mining hydraulic system, by using the cam mechanism to control the pilot valve to open or close. The motor control unloading valve can be automatic with a very simple structure. And the advantages of the traditional mechanical unloading valve and electromagnetic unloading valve are well combined with the motor controlled unloading valve, and many disadvantages of the traditional mechanical unloading valve and electromagnetic unloading valve are avoided. Motor controlled unloading valves have good potential for development

Keywords:unloading valve; motor control; automatic control; emulsion pump; coal mining