Patent ID: 8562077
Filing Date: 2013-10-22
Classification: E21C,E21D

Abstract:
1. A method of setting an automatic level control of a plow ( 17 ) in longwall mining operations, in underground coal mining, equipped with a hydraulic shield support and a face conveyor ( 16 ) that guides a plow guide mechanism ( 18 ) disposed on the plow ( 17 ), including the steps of: by means of a boom control mechanism that is supported on the shield support, changing the position of said face conveyor ( by means of the boom control mechanism, setting a control angle ( for each stroke of said plow ( in a calculating unit, calculating a face height change therefrom per plow stroke; in the calculating unit, associating a face height, as a projected height, with each face position of said face conveyor ( when a shield support frame ( comparing the calculated actual height with the stored projected height; and for subsequent plow strokes, taking into consideration a height differential value (