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ComponentElectric Wire Rope Hoist
The part that actually lifts the load — its service life and maintenance are decided right here.
How it works
The motor turns the drum through a gearbox; the rope winds onto the drum, pulling the hook up. The sheave system in the hook block splits the force in the rope, letting heavier loads be lifted with the same rope.
The brake is spring-applied, electromagnetically released: it closes on its own when power is removed. Backing up the hoist brake with a second one is a common choice in heavy-duty applications.
Critical maintenance points
This unit's service life is set by whether the rope spools evenly on the drum, whether the drum grooves and sheave pockets stay free of wear, and whether the brake's air gap stays correctly adjusted.
A worn sheave wears out a freshly fitted rope quickly. That's why the sheaves and drum are checked whenever the rope is replaced.
Comparison with a chain hoist
| Criterion | Wire rope hoist | Chain hoist |
|---|---|---|
| Tonnage | Moderate to high | Low to moderate |
| Lifting height | High — winds onto a drum | Limited — chain collects in a box |
| Hoisting speed | Generally higher | Lower |
| Building-height demand | Needs more space | Compact |
| Maintenance | Rope, drum, sheaves | Chain, guide, box |
| Initial cost | Higher | More economical |
Technical terms
| Term | What it means |
|---|---|
| Drum | The grooved cylinder the rope winds onto. |
| Reeving system | The sheave arrangement that splits the force in the rope to raise capacity. |
| Hook block | The block carrying the hook and the lower sheaves. |
| Safety wraps | The minimum number of turns that must remain on the drum when the hook is at its lowest. |
Frequently asked questions
When does the rope need replacing?
When broken-wire count, diameter reduction, corrosion or deformation reaches the discard criterion. It's judged on the measured finding, not on time elapsed.
Does it need to have a dual brake?
Not mandatory, but it's a common safety choice for heavy-duty use and risky loads; the need is set by a risk assessment.