Method and hydraulic driving device for an overload work condition protection of a clutch-brake combination powered mechanical press

摘要

The method of operating an overload protector for a coupling-brake controlled mechanical press involves using a time, movement or angle parameter of the hydraulic pressure drop in the clutch (17). The pressure drop is determined using a ramp function or cascade function. The slippage or heat generation values of the clutch can be used to determine if the press is stopped.