Electric hoist has the characteristics of compact structure, light weight, small volume, convenient operation, easy maintenance, etc. The electric hoist can be installed on the overhead I-beam alone or on the electric or manual single beam, double beam, cantilever, gantry and other cranes. Therefore, it is one of the commonly used lifting equipment in factories, mines, ports, warehouses, freight yards, shops and so on. It is a necessary machinery to improve labor efficiency and working conditions. The main products are widely used in ports, electricity, steel, shipbuilding, petrochemical industry, mining, railway, construction, metallurgy and chemical industry, automobile manufacturing, plastic machinery, industrial control, highway, heavy transportation, etc.