Shearing cylinder oil way and metal gantry shear hydraulic system thereof

The utility model discloses a shearing cylinder oil way and a metal gantry shear hydraulic system thereof, and belongs to the technical field of speed increasing hydraulic pressure of gantry shears, and the shearing cylinder oil way comprises a rapid cylinder and a shearing cylinder which are connected in parallel; the rapid cylinder is connected with an oil inlet path through the rapid cylinder upper cavity oil inlet on-off valve assembly, and the rapid cylinder lower cavity oil inlet on-off valve assembly and the rapid cylinder lower cavity oil discharge on-off valve assembly are connected with the oil inlet path and the oil return path respectively. The shearing cylinder is connected with an oil return path, an upper oil cavity of the rapid cylinder and the back pressure side of the oil drainage on-off valve assembly of the lower cavity of the rapid cylinder through the prefill valve, the upper cavity oil inlet on-off valve assembly of the shearing cylinder and the upper cavity pressure relief on-off valve