Method of Setting an Automatic Level Control of the Plow in Plowing Operations of Coal Mining
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Abstract
A method of setting an automatic level control of a plow in longwall mining operations. By means of a boom control mechanism, a control angle for setting motion of the plow, which is guided on a face conveyor, in an exploitation direction as a climbing, plunging or neutral motion is set. For each plow stroke, a cutting depth and the control angle, derived as a differential angle between inclinations of the face conveyor and of a top canopy of a shield support frame are determined. In a calculating unit, a face height change per plow stroke is calculated therefrom and a face height, as a projected height, is associated with each face position of the face conveyor. When a shield support frame that trails behind the plow in terms of a time delay reaches a respective face position, an actual height of the face is calculated and compared with the store projected height. For subsequent plow strokes, a height differential value between the projected and actual heights, determined for a respective face position, in the sense of a self-learning effect of the calculating unit when the control angle that is to be set to achieve a projected height of the face is prescribed, is taken into consideration.
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Citations
46 Claims
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1-23. -23. (canceled)
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24. 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:
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by means of a boom control mechanism that is supported on the shield support, changing the position of said face conveyor (16), including the plow (17) guided thereon, in exploitation; by means of the boom control mechanism, setting a control angle (20) for setting a motion of said plow (17) in the exploitation direction as a climbing motion, dropping motion, or neutral motion; for each stroke of said plow (17), determining a cutting depth (21) and the control angle (20), which is derived as a differential angle between an inclination of a top canopy (11) of a shield support frame (10) and an inclination of said face conveyor (16) in the exploitation direction; 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 (16), wherein the face position corresponds to a plow stroke, and wherein the projected height is then stored in the calculating unit; when a shield support frame (10) that trails behind said plow (17) in terms of a time delay reaches a respective face position, calculating an actual height of the face on the basis of values detected by inclination sensors (15) mounted on said shield support frame (10); comparing the calculated actual height with the stored projected height; and for subsequent plow strokes, taking into consideration a height differential value (28), between the projected height and the actual height, determined for a respective face position, in the sense of a self-learning effect of the calculating unit when the control angle (20) for said plow (17) that is to be set to achieve a projected height of the face is prescribed. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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Specification