| 摘要 |
Bar screen apparatus of the type having a motorized rake assembly, that mounts an electric drive motor with associated electrical components which moves the assembly along a guide frame in a closed, approximately vertical path from an upper parking position to and through a lower reversing direction position, is imporved by adding a protection device to prevent the drive motor and associated electrical components from being submerged in a stream of sewage passing the apparatus at an abnormally high level. Such protection device includes a detector unit to sense the presence of liquid that may exist at or above a predetermined level, a monitor unit for determining where the motorized rake assembly is along its travel path during operation of the apparatus, and a logic unit for determining by input from the monitor unit whether the motorized rake assembly should move in a forward direction or in a reverse direction along its travel path from a given location to return with the least amount of travel from the given location. In preferred embodiments, the protection device also addresses overload problems.
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