... working level should be according B/T9008.1-2004 "wire rope hoist - Part 1: Types and basic parameters and technical conditions" ... and working principle of CD1, MD1, wire rope electric hoist CD1, MD1 rope electric hoist is made up by 3 parts: Hoisting mechanism ... mechanism and electrical control devices. MD1, HMD1 electric wire rope hoist is based on CD1, which changes hoisting mechanism to dual ...