Hydraulic system for deep hole machining through cutter drill

The hydraulic system comprises a moving head, a drill rod supporting ring, a sealing piece, an oil inlet, an oil guide cavity and a plurality of sealing pieces, a front groove and a rear groove whichare used for containing a workpiece and the drill rod supporting ring are formed in the two ends of the moving head respectively, and a taper angle connected with the end of the workpiece is arrangedat the bottom of the front groove. The drill rod supporting ring comprises a ring body and a limiting plate, the side face of the limiting plate is in close fit with the groove wall of the rear groove, an end cover is arranged at the end, facing the drill rod, of the movable head, two arc-shaped nozzles are symmetrically arranged on the oil guide cavity, and the tail ends of the arc-shaped nozzlesextend towards the outer side of the movable head; a scrap pouring pipe, a filter, an oil discharging pipe, a recoverer and an oil return pipe are sequentially arranged on the outer side of the moving head, and a filter screen