Permeability meter for coal body under dynamic load effect

The utility model discloses a permeability meter for a coal body under a dynamic load effect. The permeability meter comprises a barrel-shaped high-pressure barrel, wherein the high-pressure barrel penetrates through an upper seat and is fixedly arranged on a lower seat; the upper seat is fixedly connected with the lower seat into a whole through bolts; a high-pressure air chamber, a high-pressure punch, a pressurized piston, a coal body test-piece groove and a radical displacement sensor are sequentially arranged on the high-pressure barrel from top to bottom; a high-pressure nitrogen cylinder, an air inlet pipe, an axial pressure pump and a confining pressure pump are respectively arranged at two sides of the high-pressure barrel; the axial pressure pump and the confining pressure pump are respectively communicated with the lower end and the periphery of the high-pressure barrel through pipelines, so as to apply pressure on the upper and lower part and the periphery of the coal body in the coal body test-piece groove; an air outlet pipe and a flow meter are arranged at the lower end of the lower seat; the flow meter is used for metering the gas passing amount when air is discharged from the air outlet pipe; and pressure gauges are arranged on the pipelines of the air inlet pipe, the air outlet pipe, the confining pressure pump and the axial pressure pump. The permeability meter for the coal body under the dynamic load effect is capable of determining the permeability of the coal body with an axial dynamic load at different confining pressure.