| 摘要 |
An overload protection device for preventing excess of allowed workload in air-operated lifting devices. A braking device is associated with a drum around which a wire is wound. Upon actuation of a control valve which controls the supply of air to a drive motor, the braking device is released. If the lifting device is overloaded, then a main valve is adjusted by means of a load sensing device and the braking device is applied by venting through the main valve. |
