Different cranes use different hoists types
Hoist for crane is a kind of equipment that uses ropes or chains to wind drums or hoisting wheels to lift or reduce the load. Mainly divided into manual hoist, electric hoist, pneumatic hoist and hydraulic hoist. It can be used as a lifting medium by chain, fiber or steel wire rope.
Manual hoist is divided into hand hoist and hand hoist. When lifting a heavy object by hand, the hoist pulls the chain clockwise and runs with the help of the sprocket. When lowering the heavy object, the chain is pulled in the opposite direction, and the brake seat and brake pads are separated. The hoist is to pull the handle with the help of manpower, and through the principle of leverage, it alternately acts on the pliers body loaded in the movement to drive the load. The manual hoist is easy to use, small in size, and cost-effective. The disadvantage is that it is low in efficiency and labor-intensive.
The electric hoist is operated by the electric motor, and the torque is expanded by the reducer, and the wire rope or chain is pulled to lift the heavy object. The lifting part is composed of two parallel drums, with a large lifting height and a large lifting weight. It adopts a cone-shaped rotor or a magnetic circuit motor. Compared with the TV type, it has the characteristics of light weight, reliable braking, and multiple structural forms. Electric hoist is widely used and easy to use, and can lift large tonnage heavy objects. The disadvantage is that it is large in size, heavy in structure, and easy to burn when overloaded.
Pneumatic hoist uses a pneumatic motor as a power source, and uses a deceleration mechanism to pull a chain or a wire rope to lift heavy objects. Pneumatic hoist is currently the ideal explosion-proof crane equipment. It is simple to use, can be overloaded, has high positioning accuracy for lifting and lowering, safe and explosion-proof, and has a long service life. It is widely used in various special occasions, such as mines and oil fields, chemical workshops, etc. .