RD series caster special double-enveloping speed reducers RD-double-enveloping worm-gear reducer is to introduce United States Rome company (ROKOPCO/U.S.A) patented technology and production of metallurgical industry-specific drive, its carrying capacity, compact and reasonable structure, small size, widely used in metallurgical mill straightening machines, dummy bar storage device and vibration device. Shaft-mounted structure, and easy to work with machinery associated