Passing lifting wire through the sunken ship is key working procedure for sunken ship salvage.

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 presents mathematical formulas of stresses of union purchase, analyses and illustrates the stresses of derricks, guys and topping lifts under the influence of tiedguy positions by numerical prediction, which is helpful for selecting fit positions of guys.