Two-propulsion travelling mechanisms of shearers for thin beds

Abstract

The paper deals with urgent for coal industry problem of designing of shearers for thin beds. The shearers should be equipped with travelling mechanisms with two frequency-controlled drives, one frequency converter, and rigid traction unit. The paper deduces from the experiments and theoretically explains a phenomenon of originating of out of phase load variations within drives of such a type. The paper gives recommendations on decrease in affect of load variations on shearer efficiency. The paper proposes a version of correcting a proportional control law in frequency- controlled drive, providing extension of a range of service speeds of the shearer as well as required moving forces.