Development and Application of Step-Separation Advanced Support

Due to the backwardness of traditional individual prop used for advanced support roof in return airway roof in fully-mechanized coal face, and according to the geological characteristics of Pingshuo Mining Area in China Coal Energy Group, step-separation advanced support group of ZFDC26500/22/43 was developed. T he four-bar linkage system of support group reduced the area of wind resistance, the mechanical move of support group realized by the use of electro-hydraulic control system and step forward. The stability of support group was increased, the system of prevention falling which could rotate in three-dimensional space was designed. Th e application showed that the surrounding rock deformation of return airway was well controlled by the support group, and the integrity of roadway could be well maintai ned. By the usage of support group, the traditional individual prop support could be substituted, and safety space for workers and equipments could be supplied.