Mining the hydraulic l column, 3 tons and 5 tons, 8 tons, l column, 3 tons, 5 tons, 8 tons of prop 
 First, use 
 The mining of hydraulic l column is the application of hydraulic technology and equipment manufacturing, coal mine or column tool for the coalface HZWA micro increasing resistance metal prop set up to support the use of tight. Mechanical l column device, not only compact and effortless operation convenience, high-speed fast, the most prominent advantage is the beginning of the support force. Underground to reduce roof fall accidents, ensure the safe production effect is very obvious, and won the miners welcome. 
 Second, the technical characteristics 
 Cylinder diameter 30mm 
 Piston diameter of 10mm 
 Handle length 400 mm 
 Rated original supporting 49KN (5T) 
 Maximum rise 120mm 
 Oil rated working pressure 703Kg/mm2 
 Support process (full stroke of the handle, shake 10 times increase in volume) 31mm