Introduction to Electric Hoist:
The CD/MD model electric wire rope hoist is a versatile and robust lifting solution widely used in industrial applications. Designed for seamless integration with single-beam overhead cranes, gantry cranes, and other lifting equipment, it can also function as a winch with slight modifications. This hoist is an essential tool for enhancing productivity and improving working conditions across factories, mines, harbors, warehouses, cargo storage areas, and retail shops.
Applications:
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Trolley Electric Hoist:
- Can be installed on most cranes or hung on joist steel girders.
- Suitable for lifting cargo in straight or curved paths.
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Fixed Electric Hoist:
- Mounted on fixed supports to lift cargo vertically or at various angles.
These hoists are ideal for industrial enterprises, mining operations, factories, workshops, railways, seaports, warehouses, and storage yards, making them a modern and efficient choice for improving working environments.
Operating Conditions:
- Temperature Range: -20°C to +40°C
- Humidity: ≤85%
- Altitude: ≤1000m
- Environment: No fire, no explosive materials, and no corrosive substances.
- Restrictions: Not suitable for lifting molten metal, toxic, explosive, or flammable materials. The hoist is designed for medium-duty operations; for higher-duty cycles, the rated lifting capacity must be reduced by 20% per level of duty increase.
Transmission and Working Principle:
The CD/MD electric hoist comprises three main components: the lifting mechanism, traveling mechanism, and electrical parts.
Lifting Mechanism:
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Operation:
- A lifting motor drives the rope drum via a coupling and the hollow shaft of a reducer, enabling the wire rope to move the hook unit up or down.
- For lifting heights of 6m, a claw coupling connects the motor shaft and the reducer input shaft.
- For heights ≥9m, an intermediate shaft with a rigid coupling is added.
- For heights ≥18m, a carriage is incorporated to enhance intermediate shaft rigidity.
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Motor:
- Tapered rotor motors provide strong starting torque for frequent intermittent operations.
- CD hoists use ZD-type single-speed motors, while MD1 hoists feature ZDS-type dual-speed motors with a speed ratio of 10:1.
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Reducer:
- Hoists with a 2-ton capacity use straight-tooth planetary gear reducers. Other models use helical gear three-stage reducers.
- Gears and shafts are made of alloy or high-carbon steel, heat-treated for durability.
- Cast iron construction ensures damping performance and reliable sealing.
Rope Drum:
- Constructed from cast iron or seamless steel tubes with power transferred via splines.
- It is the core of the hoist, connecting the traveling mechanism, hook, and wire rope.
- Equipped with limit stopper rods and heavy punch stop blocks for added safety.
Lifting Hook:
- Forged from specialized steel for strength and reliability.
- Equipped with thrust ball bearings for smooth operation.
- Single slide wheels for capacities ≤5 tons; double slide wheels for capacities ≥10 tons.
Electric Device:
The electric system includes:
- Control Box: Houses relays and circuitry.
- Button Switch: Operates at 380V or 36V, allowing directional control of the hoist.
- Limit Stopper: Ensures safe and precise operation.
By pressing the appropriate buttons, operators can control the hoist's movements via the relays in the control box.
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