Method for handling goods with vacuum lifting device

摘要

The method involves ensuring that the earliest time (t1) that a vacuum lifting device can raise a load occurs after the rate of vacuum loss in the vacuum has reached zero (VB to V0). The lifting action will only take place if the vacuum pressure is above a set minimum negative pressure (VE). The variation in the vacuum pressure (VN) over time is measured by a control mechanism which gives a signal when the various threshold values are reached. If a subsequent loss in vacuum pressure occurs, an emergency vacuum generator can be operated by the control mechanism as soon as a drop in vacuum occurs (V1,V2,V3) and before the minimum is reached.