Having compared several methods of improving setting force, the authors considered that three of these methods as setting force keeping value, automatic boosting of pressure and push actuator can be adopted.

Based on the theory of double-telescopic prop of equal load equal setting and equal pressure,the process of the optimal design was built after the introduction of principle and the analysis of the initial conditions.

The content of the subject is to develop a kind of equal setting equal pressuredouble-telescopic prop used in power support.

Hydraulic support setting force have important influence on working face ground pressure behavior.

The causes of insufficient setting force of hydraulic supports have been analysed and the measures of improving setting force are proposed.

A system for boosting automatically the setting pressure is proposed in this paper in order to solve the problem of insufficient and inhomogeneous setting force of powered support and to solve the constraint relation between high flow and high pressure.

Approach on influencing factor about setting load of a hydraulic prop;

The study on monitering and ensuring system of support setting load;

An experimental study on the geological factors affecting the setting loads of single props used in coal faces

The article first theoretically verifies the unnesessity of installing pressure keeping valve in the JZ 7 air pressure breaker by comparing the installation and non installation of such a device.