Research on jacking hydraulic system of mine-used pipe-jacking machine

In view of the problem that it will lead to jacking direction offset while four oil cylinders in the jacking system for underground coal mine jacking construction had different jacking speeds, a pipe-jacking hydraulic system based on load sensitive control technology was designed. The structure and working principle of pipe jacking machine, working principle and parameters calculation of hydraulic system were analyzed in details. The hydraulic system uses electro-hydraulic controlled quadruple load-sensitive multi-way values to regulate pump flow and pressure so that the speed of each jack cylinder is not affected by external load changes, and synchronous jacking is achieved, and direction offset phenomenon caused by imbalance of jacking speed of fuel tanks is reduced.