Buffering oil pad structure of hydraulic rock drill

• Main Authors: QIN YIQING, GUO DIANSHENG, XU KANGCUN, DU SHOUNIAN, CHEN XIUSHEN, XU ZUQUAN, LI CHUNLI
• Format: Patent
• Language: Chinese; English
• Published: 20.05.2009
• Subjects: CHEMISTRY; EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; GALLERIES; LARGE UNDERGROUND CHAMBERS; MANUFACTURE OF IRON OR STEEL; METALLURGY; METALLURGY OF IRON; MINING; MINING OR QUARRYING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS; SHAFTS; TUNNELS

The utility model discloses a cushion oil pad structure of a hydraulic rock drill, which comprises a front cylinder sleeve, a rear cylinder sleeve and a piston, wherein the front and rear cylinder sleeves are arranged in a rear cavity of an impacting mechanism of the rock drill, a front shaft shoulder and a rear shaft shoulder of the piston are respectively limited by the end faces of the front and rear cylinder sleeves, the oil pad structure for cushioning the front and rear shaft shoulders of the piston is arranged at the end faces of the front and rear cylinder sleeves, the oil pad structure is characterized by providing a front annular groove and a rear annular groove which can be respectively inserted by the front and rear shaft shoulders at the end face of the front and the rear cylinder sleeves, and the cross sections of the front and rear annular grooves are equal to those of the front and rear shaft shoulders. When the piston is in excess of stroke, the oil pad structure can effectively cushion the p