Stroke protection structure of electro-hydraulic servo valve and adjusting method of stroke protection structure

Abstract

The invention belongs to the technical field of electro-hydraulic servo valves, and particularly relates to a stroke protection structure of an electro-hydraulic servo valve and an adjusting method of the stroke protection structure. The stroke protection structure comprises a torque motor, an upper cover, a shell, a valve element, a valve sleeve, an end cover, an end cover screw, a left limiting block, a right limiting block, an adjusting screw and a rubber ring; the torque motor is installed on the shell through screws, a valve sleeve hole is formed in the shell, the valve sleeve is installed in the valve sleeve hole of the shell, the valve element is located in the valve sleeve hole and is in clearance fit with the valve sleeve, the left limiting block and the right limiting block are installed at the left end and the right end of the valve sleeve hole respectively, and the end covers are installed on the two sides of the shell through end cover screws. By means of the designed stroke protection structure, the limiting size of a valve element of a product is calculated in detail, the stroke protection requirement of the large-zero-offset and flow saturation electro-hydraulic servo valve can be met, and therefore the safety of the electro-hydraulic servo valve is improved; the servo valve is installed on a test bed, the positions of the left limiting block and the right limiting block are adjusted by adjusting screws in real time, and adjustment is accurate and reliable. The left end cover and the right end cover are provided with adjusting screw threaded holes, whether the end covers leak oil or not can be monitored in the debugging process of the servo valve, whether the end covers leak oil or not can be checked by taking down adjusting screws after oil leakage faults occur to the end covers of the servo valve, and operation is convenient and fast; and the adjusting screw is glued, the locking mode is reliable, and the requirements of vibration, impact and the like can be met.

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