My paper mainly foused on the problem which is design out a type of chock-shield support.
Modern longwall mining employs hydraulic powered supports at the face area. The supports not only holds up the roof, pushes the face chain conveyor, and advances itself, but also provides a safe environment for all associated mining activities. Therefore its successful selection and application are the prerequisite for successful longwall mining. Furthermore, due to the large number of units required, the capital invested for the power support usually accounts for more than half of the initial capital for a longwall face. Therefore both from technical and economic points of view, the powered support is a very important piece of equipment in a long wall face.
The chock shield combines the features of the chocks and the shields. As such it possesses the advantages of both.
The hydraulic support described is a part of the mining industry equipment in the mine, used for protection of working environment in the gallery. It works well or bad at work basing on its support mode, frame and some parameters. In the first step, the optimal values of some parameters of the leading four-bar mechanism are determined by using Visual Basic. Secondly, the base of mechanic model of support-surrounding, the mechanism and loads on the support is decided. The next work, with the condition of the design, the main mechanics of hydraulic support is analyzed and calculated by plane and spatial model. Finally, the under frame, top beam cave shield, wrists and hydraulic column are analyzed by calculation. And draw out all the process drawings.