SCRAPER HYDRAULIC SYSTEM Russian patent published in 2016 - IPC E02F3/65 E02F9/22 

FIELD: machine building.

SUBSTANCE: invention relates to hydraulic actuators of working members of scrapers. Disclosed is a scraper hydraulic system including hydraulic pump, hydraulic cylinders for the bucket control, hydraulic cylinder drive hydraulic cylinder rear wall, front damper, hydraulic cylinder additional front flap, an additional controlled back valve, standard controlled back valve, filter, hydraulic tank, standard three-section hydraulic control valve, two sections of which are connected to one of lines of actuating hydraulic cylinders bucket drive and the rear wall, third-line with two hydraulic cylinders front main and additional gates, and pipelines. Hydraulic cylinders of additional front flap and front flaps are connected in parallel opposite cavities. Besides, between the hydraulic cylinder rod additional front flap and blind side of front flap there is an additional controlled back valve control chamber which is connected with drive hydraulic cylinder rod rear wall. Besides, the blind cavity of hydraulic cylinder additional front flap is connected with the line of hydraulic control valve to controlled return valve bucket hydraulic cylinder.

EFFECT: control of four groups of cylinders from one of the standard three-way hydraulic control valve with the possibility of independent control of two hydraulic cylinders from one section of the standard hydraulic control valve.

1 cl, 2 dwg