HYDRAULIC HAMMER FOR PILE DRIVING Russian patent published in 2007 - IPC E02D7/10 

FIELD: construction equipment, particularly for pile driving during foundation erection, particularly to drive tubular marine piles and to remove piles from ground, for marine shelf rock crushing.

SUBSTANCE: hydraulic hammer comprises impact body 7, hydraulic cylinder for impact body acceleration, hydraulic pump 22 for impact mass 7 lifting, hydraulic accumulator 9 for rapid oil discharge from hydraulic cylinder 2 during impact body acceleration, as well as hydraulic distribution means 17 to control oil flows, pressure 18 and discharge 19 hydraulic lines. Hydraulic hammer has cylindrical body 1 and doubled high-pressure gas 5 and low-pressure gas chamber 10 arranged inside the body. Piston cavities of hydraulic cylinder 2 for impact body 7 acceleration and hydraulic accumulator 9 made as hydraulic cylinder are communicated with the chamber. Hydraulic hammer has hydraulic distribution means 17 having electric control member 15. Discharge pipeline 19 is linked to hydraulic pump 22 inlet and is connected with hydraulic accumulator 9 through hydraulic distribution means 17 to open oil flow in hydraulic cylinder 2 by means of hydraulic pump during impact body 7 drop.

EFFECT: increased economical efficiency along with increased impact frequency and possibility to change impact power in wide range.

1 dwg, 2 tbl