| 摘要 |
<p>A crane such as a gantry crane 101 has a hoist 113 for performing a lifting operation, a controller 125 and at least one sensor 127 for detecting the presence of a person in a safety region 129 such that operation of the crane 101 is inhibited when the sensor 127 detects a person in the safety region 129. The sensor 127 may be a thermal imaging camera or a motion detection sensor. Operation of the crane 101 may be inhibited by reducing operating the speed of the hoist 113, stopping the hoist 113, reducing a lateral travel speed of the hoist 113 or permitting only incremental lateral movements of the hoist 113. A load sensor may be provided such that operation of the crane 101 is not inhibited when no load is applied to the hoist 113. A load may be held stationary for a short period after an initial lift to allow any swing to abate. A height sensor may be provided and crane operation may be inhibited if the height of a coupling attached to the hoist is below a pre-defined operating height H1.</p> |
