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

Vertical dip mining system for fully mechanized face under the condition of large dip angle (24°);

Aiming at the complex geologic condition in deep angle inclined top-coal wall,analyzed the reciprocity relationship of fully mechanized top-coal hydraulic support stress state and enclosing rocks under the condition of large dip angle,expatiated the effect on the capability of hydraulic powered support that the enclosing wall characteristic arousing.

Having taken high inclined angle 31502 working face fully mechanized top coal caving in Zhang Ji Mine of Kangbao Mining Company as object of study,this paper analyzes the complicated situation the 31502 fully mechanized top coal caving face will face,having taken specific measures and management methods to guarantee mining safely,providing methods for future mining and accumulating experience.

Through the research and analysis on 8256 light carving face support gliding caused by complicated geological structure,deep mining,and high inclined angle in Yangquhe Coal Mine,this paper provides a solution to the gliding of light caving support and ancillary equipment,improving the recovery rate of coal,providing a reference for future mining under similar conditions.

In view of the actual situation,through the transformation of the mechanical and electrical equipment,the adjustment of extraction technology and strengthening the management of safety production,we are successful in the elevated fully mechanized coal face high inclined angle .

Technical Research of Complicated Coal Seams with Deep Dip Angle;

Study the feasibility of the bolt support technology used in deep dip angle half-coal rock roadway in this paper,and analysis the effect on roadway's rock stress distribution and condition of maintenance when the vertex angle coal hold,finally,a bolting support design is suggested,and the research results have been applied to the project successfully.

Application of rotary fan-shaped actual mining technology in large inclined angle face;

Approach on combined mining technology at large inclined angle middle and thick coal seam;

A mining technique without netting was applied in the conditions of compound Roof,"three-soft" seam and large inclined angle in working face NO.

Based on the machining principle analysis of the nature ruled surfaces, the technologies of NC programming for intricate nature ruled surfaces by wire-EDM were studied, including the profile marking standard, the algorithm of seeking corresponding points, equal-error synchro-linear approximation of profiles and the method to calculate the maximum inclining angle of ruling.

In this paper, by the motion analysis of four-axis wire-Electric Discharge Machining (WEDM) machine tools, it is concluded that, during the machining of intricate ruled surfaces only with linear boundary curves, the maximum inclining angle of the wire and the maximum displacements of the machining table and the wire guiding head occur on the vertices of the boundary lines.