Hydraulic Prop is a kind of single retractable prop which uses the liquid pressure to produce working resistance and realize lifting and unloading. Hydraulic Acrow Props is mainly divided into suspension type, double telescopic suspension type, DN internal injection type and FRP single hydraulic prop.
Acrow prop is widely used in coal mine operation, but it should be noted that hydraulic prop can not work in the following working face:
1. Blasting mining face with relatively hard coal quality and working face with strong periodic weighting or rock burst.
2. The mining height of hydraulic acrow props working face is too low to ensure the minimum height required for pillar safety recovery after roof subsidence.
3. Different working characteristics or different working resistances can not be mixed in the same hydraulic acrow props working face.
