BIG DRAGLINE WITH ELECTRIC DRIVE Russian patent published in 2006 - IPC E02F3/48 E02F3/58 E21C47/02 

FIELD: excavation.

SUBSTANCE: invention relates to dragline bucket suspension and control system. Proposed dragline has rated load capacity by suspended weight exceeding 100 tons. It has support installed for turning on base, boom assembly projecting outwards from support and installed for turning together with support, bucket, rigging and control system. Bucket is suspended from extreme end of boom by means of adjustable hoist cables and is controlled by at least one adjustable drag cable stretching from support to bucket. Rigging has first and second sheaves of boom head arranged on extreme end or near extreme end of boom assembly at fixed distance from each other, one after the other, so that first sheave is located closer to support then second sheave. First and second hoist cables pass over first and second sheaves of boom head, one cable passing over each sheave. First hoist cable passes downwards over sheave and is connected in operating position with front part of bucket. Second hoist cable passes downwards over second sheave and is connected in operating position with rear part of bucket. Control system uses computer to control relative travel of first and second hoist cables through load-lifting device. It is installed to change angle of tilting of bucket in vertical plane by differential displacement of one hoist cable relative to the other.

EFFECT: improved efficiency of dragline operation, provision of accurate adjustment of bucket displacement angle.

9 cl, 22 dwg