Study on stability technology of hydraulic support in fully-mechanized caving working face with large dip angle;

Light type caving coal hydraulic support structural characteristic and discussion on canopy structural design;

The research of appropriate original supporting pressure of powered support;

Dynamic analysis of caving powered support stability in deeply inclined coal seam;

Study on powered support canopy motion track of joints with clearance;

The structure patterns and performance analysis of the double-telescopic props of hydraulic supports;

Computer aided concept design system for hydraulic supports;

The structure characteristics and principle of the new type relief valve used on hydraulic supports were introduced.

Study on the Structure of the Cartridge valve with on Operating system of the Hydraulic supporter Support-post;

Study on the feasibility of the hydraulic supporter with water medium;

A kind of new style combination linear hydraulic supporter is offered,which possesses the characteristic of light weight,reasonable structure, excellent mobility and low investment ect.