How to achieve explosion proof chain hoists?

Explosion-proof  Manual hoist   and other equipment and other components are not prone to mechanical collision sparks, limits the ignition source, to prevent the explosion, explosion-proof purposes.
Proof chain hoist is a professional proof class manual lifting tool, especially suitable for explosion-proof construction work liquidity requirements and do not have other sources of power used when lifting loads occasions. Hand monorail car with proof supporting the composition of manual lifting and transport trolley, so that proof chain hoists lifting goods more flexible. The product has explosion-proof performance, security and stability, simple operation, easy maintenance.
Explosion-proof  chainb lock  principle is as follows:
Its way into mechanical spark-proof type. Most of its parts are copper alloy. Since copper is relatively low hardness, soft texture, friction and collisions have a very good compromise and difficult to strip out the tiny metal particles, while copper has good thermal conductivity, electrical conductivity, friction or impact generated when the heat is timely absorption and conduction. When the copper raw material is added a sufficient amount of composition of copper alloy with metals such as aluminum copper alloy,wire rope winch not only to maintain the characteristics of copper, but also with the part of the desired mechanical strength and hardness. So that in use the friction between the parts are not prone to mechanical sparks, hooks, chains and other parts and other equipment is not easy to produce mechanical collision sparks limiting the ignition source, to prevent explosion, explosion-proof purposes.