HYDRAULIC GRAB Russian patent published in 2025 - IPC E02F3/47 E02F9/22 

FIELD: construction.

SUBSTANCE: invention relates to construction and can be used in excavating machines for development of deep trenches and reservoirs filled with liquid medium in form of clay suspension, water or other type. Hydraulic grab comprises housing and bucket jaws with drive hydraulic cylinder pivotally connected to it, made with perforated cavities on inner surface and with hollow teeth communicated with fluid medium pressure source, moving crossbar, hydraulic accumulator, controlled hydraulic valves and controlled hydraulic throttles. Fluid pressure source is made in the form of pressure hydraulic cylinders pivotally connected to the housing and to the movable crossbar pivotally connected to the jaws. Cavities of pressure hydraulic cylinders are interconnected by one pipeline through inlet check hydraulic valve and filter with liquid medium in trench and the second pipeline through the hydraulic check valve with the hydraulic accumulator, which is connected through the first controlled hydraulic valve and the first adjustable hydraulic throttle with a perforated cavity on the inner surface of the jaws and through the second controlled hydraulic valve and the second adjustable hydraulic throttle with hollow teeth. First controlled hydraulic valve control chamber is communicated via hydraulic line with jaw drive hydraulic cylinder rod end, control chamber of the second controlled hydraulic valve is communicated with its piston cavity.

EFFECT: simplified design and higher reliability, reduced power consumption and easier control of working process.

1 cl, 1 dwg