In the paper, the problem of oil leakage in hydraulic system of rail stamping machine is analyzed, and the design defect on L oil tube of hydraulic system is analyzed by combining the site use condition and detailed calculation. The root cause of oil leakage in hydraulic system is found out, and the solution aiming at this defect is put forward: servo valve in hydraulic system is configured with the separate L oil pipeline to ensure that the return pressure of newly added L oil pipeline is basically zero. Thus the problem of oil leakage in hydraulic system of rail stamping machine for many years is solved.

hot stamping machine  /  servo valve  /  pressure