Kilowatt-level rock output three-redundancy electro-hydraulic digital servo system

A kilowatt-level rock output three-redundancy electro-hydraulic digital servo system is composed of a digital servo controller and a rock output electro-hydraulic servo mechanism. According to the scheme, three independent sub-controllers in the controller carry out control over a servo valve with three front levels on the servo mechanism, and a three-redundancy feedback potentiometer feeds back the position of a piston rod to the three sub-controllers so as to form a closed loop. According to the technical scheme, under the situation that one path of the servo valve is in open circuit, it can still be guaranteed that the system normally works, a dynamic pressure feedback hardware device of a traditional servo valve is eliminated, a software algorithm is adopted for replacement for the controller, and the beneficial effect of flexible parameter adjustment is achieved. In addition, a previous tilting axis constant pump is replaced with a direct-axis variable displacement piston pump in the system, compared with the prior art, rapid starting performance is improved, and self regulation of flow is achieved, wherein a previous overflow valve is eliminated. Finally, a composite seal and a double-way seal are adopted in a key linear movement sealing part in the system to replace a previous O-shaped ring and a previous one-way seal, and compared with the prior art, long-term storage and service life prolonging of products are better facilitated.