Back to the winch: The winch also called slow winch, mine coal face back caving. Due to the lower height and light weight, is more suitable for thin coal seams and very inclined seam coal face, as well as a variety of coalface recycling sinking into the floor waste rock buried beneath the metal pillar. Of course, with the improvement in the level of mechanization of coal mining and updates back to the winch is used for mechanized coal face, as the installation, recycling traction for a variety of equipment and spare parts. Winch principle: the use of the the spherical turbine auxiliary drive to work. Winch features: compact structure, simple machine to go down. Smooth operation, safe and reliable. High efficiency, long life and prop winch Overall structure: symmetrical arrangement, elongated strip, sled-like base, more flexible to move, but without losing a smooth prop winch various types of technical parameters: Model JH-JH-8 JH-14 JH-20 JH-30 Reel Diameter (mm) Width (mm) 280 280 380 440 540 262 230 300 530 560 wire rope diameter (mm) 15.5 17 21.5 24.5 30 Yung amount of rope m 80 100 130 170 220 wire rope static tension KN50 80 140 200 300 wire rope average speed m / s ≤ 0.2 motor Model YBJ-7.5 YBK2160M-6 YBK2225S-8 YBK2200L2 6 YBK2280S-6 voltage V 380/660 or 660/1140 Speed ??r / min 1460 970 740 980 990 Power kW 7.5 7.5 18.5 22 45 size mm 1450 * 512 * 512 1660 * 530 * 685 2000 * 685 * 935 2560 * 968 * 797 3300 * 1070 * 1034 Weight kg 622 650 1400 2500 4460