Method for controlling application of brakes in single drum hoist systems
AssigneeABB AB
InventorKlaus Kacy
Life of this patent
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Abstract
A method of damping the oscillations during an emergency stop of an ascending single drum hoist system in a shaft having a conveyance, the mechanical brakes applying a braking force to the drum and the drum rotating in a first direction having a speed, comprising applying a first brake force when the drum speed reaches close to zero enabling the drum to roll back in an opposite direction to the first direction by a force generated from a first conveyance downward swing, and controlling the brake force during the first conveyance downward swing to dissipate the energy of the swing.
Claims19
A method of controlling the application of mechanical brakes during an emergency stop of a single drum hoist system having a conveyance moving upwardly in a shaft, the mechanical brakes applying a braking force to the drum and the drum rotating in a first direction having a speed, comprising the steps of:
- determining a static load unbalance of the hoist system just prior to stop;
- applying a first limited braking force when the drum speed is close to zero, the first limited braking force being determined as a function of the static load unbalance of the hoist system;
- and
- allowing the drum to roll-back opposite the first direction as the conveyance bounces downwards.
A method of damping the oscillations during an emergency stop of an ascending single drum hoist system in a shaft having a conveyance, the mechanical brakes applying a braking force to the drum and the drum rotating in a first direction having a speed, comprising:
- applying a first brake force when the drum speed reaches close to zero enabling the drum to roll back in an opposite direction to the first direction by a force cenerated from a first conveyance downward swing;
- and
- controlling the brake force during the first conveyance downward swing to dissipate the energy of the swing.
Dependencies are inferred from the claim text.