According to the production affected by the frequent gas over the limits and then the electric power cutting off during the coal blasting operation at the high gassy seam gateway heading face, a gas hydraulic pressing and discharging technology was proposed and tested.

Study of intelligent gas discharging system based on switch resistance motor;

It is effective to apply it in gas discharging in order to improve accuracy of control and communicate with other equipment the technology since S7 serial PLC has been mature.

Through the analysis on gas discharging in Jining coalmine II, and on the basis of the gas density and the specific conditions of roadways arrangement, this aritcle, in order to achieve promptness, safety and high efficiency, integrates many effective gas discharging methods, such as full pressure ventilation, auxiliary fans and drill-holl ventilation, and so forth.

Based on analyzing the defects from which traditional gas drainage suffers,the paper offers a new gas exhausting method without over-limitation and a closed-loop control system for gas exhausting based on frequency conversion technology.

The partial ventilator in the coal mine is important in mine digging, its dependability and efficiency affect directly the safety of gas drainage.

Using the RFPA~(2D)-Flow to simulating the process of the gas drainage in low air permeability coal bed by slotting, it prove that slotting is an efficient technique to reduce the risk of coal and gas out bursting.

A fuzzy control system of gas pumping-exhaust was designed and implemented.

New method of drawing out gas before the roadway threaded together -full air pressure drill draw method;