BI-CABLE WINCH WITH HYDRAULIC STEPPER Russian patent published in 2009 - IPC B66D1/00 

FIELD: mining.

SUBSTANCE: invention refers to mining, particularly to mine lifting devices with hydraulic drive. The device consists of two stationary secured hydro-cylinders through which flexible rods made out of cable of closed structure are let through. The flexible rod is designed so as to be alternately gripped with piston rods with controlled collets; the latter facilitate transferring a cable with load. Piston rods travel under effect of working fluid supplied into hydro-cylinders from oil capacity by means of distributors. Return cavities of all hydro-cylinders of a bi-cable winch are connected between them; working cavities of upper cylinders are joined with a pipeline and are fed with a working medium directly from the hydro-distributor. The working cavity of lower hydro-cylinders of one of the winches is fed from a big cavity of a multiplier, the main cavity of which is fed via the same hydro-distributor; also ratio of areas of working cavities of the multiplier is 1:2.

EFFECT: simplifying and expanding functionality of the design.

2 dwg