... structure and working principle of CD1, MD1, wire rope electric hoist CD1, MD1 rope electric hoist is made up by 3 parts: Hoisting ... , operating mechanism and electrical control devices. MD1, HMD1 electric wire rope hoist is based on CD1, which changes hoisting mechanism ... speed and slow speed. It is different with CD1 rope electric hoist merely in hoisting mechanism and electrical control devices ...