DEVICE FOR CONTROL OF UNIT TO COMPLY WITH BED UNDULATION Russian patent published in 1994 - IPC

FIELD: mining industry. SUBSTANCE: guides of working member are rigidly connected to one arm of bell-cranks and control hydraulic cylinders are articulated to the other arm of bell-cranks. One bell-crank is hinged to roofing and the other, to conveyer bracket. Hydraulic cylinders are communicated with delivery and return hydraulic lines. Installed inside rod of each control cylinder in cylindrical cavity closed at both ends is plunger spring-loaded at both ends for reciprocation. Diameter of plunger lower end is larger than that of its upper end. End faces and recess of plunged form together with cylindrical cavity, the lower, upper and intermediate chambers. Lower chamber is hydraulic connected with head end of hydraulic cylinder by means of constant throttle. Upper chamber is communicated through rod channel with rod end of hydraulic cylinder. Intermediate chamber is communicated through rod additional chamber with return hydraulic line. EFFECT: higher efficiency. 2 cl, 2 dwg