Hoist Safety Device

The hoist safety device is the core protection element of a building hoist. It is a obligatory mechanical protection gadget requiring obligatory installation, periodic inspection and obligatory scrapping, on the whole used to stop the cage from falling due to overspeed.

 

Main Functions

①Monitors the downward pace of the hoist cage and triggers braking robotically in case of overspeed.

②Brakes the cage easily barring have an effect on or rebound.

③Cuts off the manage strength grant throughout braking to keep away from secondary risks.

④Operates merely mechanically, unbiased of electricity, hydraulics or pneumatics, making sure excessive reliability below severe conditions.

①Gear mechanism: Engages with the hoist rack to feel real-time speed.

②Centrifugal velocity governor (flyweight): Throws out when overspeed takes place to spark off braking.

③Cone drum brake: Provides modern friction braking for clean deceleration.

④Disc spring group: Generates braking pressure and controls braking distance.

⑤Micro switch: Cuts off the circuit as soon as the protection system operates.

 

Working Principle

①Normal operation: The tools rotates with the cage; the flyweight stays retracted besides braking.

②Overspeed triggering: When velocity exceeds 1.1 instances the rated speed, centrifugal pressure throws out the flyweight to have interaction the ratchet.

③Braking process: Cone drum rotates → compresses disc springs → friction braking → easy stop.

④Braking distance: 0.25–1.5 m.

①Inspection cycle: Calibration required each and every two years, regardless of usage.

②Drop test: Required after installation, overhaul or calibration, and repeated each and every three months.

③Service life: Mandatory scrapping after five years from manufacture, no extension allowed.