Currently mine loading devices are used pneumatic drive, although the pressure drive mode with fast response, convenient advantages, but the prevailing poor reliability problems, which are reflected in the following aspects :
(1) the use of concentrated natural gas resources, pipeline length, pressure loss and leakage of a large quantity;
(2) low pressure, Pneumatic components (cylinder) structure size, which is difficult layout;
(3) water separation is not the net. Winter easily frozen pipes;
(4) low precision positioning, movements poor stability, transmission shocks, so that the equipment reduced life expectancy;
(5) noise pollution.
Mine loading device is the transport link a major component of the mine with production capacity continues to improve, Mine loading of the device's ability and reliability, have set higher requirements using pneumatic drive mode has not far to meet their production requirements. High-yield, Mine right efficient loading system the capability and reliability of the specific requirements in the following areas
(1) loading, fast, and to meet the high-yield, high-efficiency coal production;
(2) loading gate, skip boxes and wandering mouth should be accurate positioning;
(3) an outage occurs, the doors, wandering mouth should return to the initial position, in order to skip through.
(4) the impact of small, equipment longevity, safe and reliable.
In response to these requests and pneumatic loading devices exist, The paper introduces a PLC using the electro-hydraulic control programs, according to the principle, This control enables loading device to meet modern efficient, high-yield mine production needs.