Application of the hoisting jack made by ourself in install of large colliery equipment;

Introduced uses the ANSYS software establishment hydraulic power support hoisting jack the method.

Improvement of push jack in ZZ4400/14.5/29 hydraulic support;

Approaching repair technology of the cladding materical of support column and jack;

Apply the Sn-Bi-welding to recondition the chromium-plated layer of vertical posts and jacks;

By using ANSYS software and European CEN standards, the nonlinear finite element simulation analysis on eccentricity load of ram is carried out in this paper, thus, the design and type-modification are optimized and the reliability of design is improved.

Through the convenient visual function of VB software,has carried on kinematics analysis in designing the Model ZY5200/8/18D Hydraulic support that is researched and developed,obtain the kinematics parameter of the Hydraulic support and the orbit pictures of sports.

This paper introduce the reform of river-crossing simply brdge by using ultrathin lifting jack,this mode avoided the foundation treatment under the bridge,reduced the influence of the river and the adjacent environment.