The electric hoist have wire rope hoist and chain hoist, and has a fast and slow speed. The slow type is often used for lifting alloy liquid pouring or starting molds and sand boxes. The lifting mechanism of the wire rope type electric hoist is driven by a motor to drive the wire rope reel to complete the lifting action.
The electric hoist is mounted on an I-beam track with a certain span and height to form an electric monorail crane. The type and span of the I-beam vary depending on the lifting weight of the electric hoist.
The electric hoist is composed of an electromagnetic brake, a lifting motor, a hook, a reel, a steel light rope, and a gear shifting mechanism. Electric monorail cranes also have rails, rollers and horizontal travel motors. The motor usually uses a three-phase cone rotor motor with a cone brake or a side magnetic motor to provide the driving force for the hoist to lift or move horizontally. The switch box with the lifting and walking buttons is hung on the lower part of the suspension cable for ground control. The motor mounted at one end of the reel is connected to the reduction gear mounted on the other end of the reel by a flexible coupling. A tapered brake is mounted on the fan shaft at the end of the electric hoist. After the motor is energized, the rotor is subjected to the magnetic force on the shaft to overcome the pressure of the spring, causing it to move to the left. The cone brake fixed on the rotor shaft is disengaged from the rear end cover of the motor, and the rotor is under the action of the spring, together with the shaft. The upper cone brake moves to the right and is in close contact with the rear end cover of the motor, and the generated friction torque stops the motor.