APPARATUS AND METHOD FOR DETECTING AND PROTECTING TELESCOPIC OIL CYLINDER OF CRANE

摘要

An apparatus for detecting and protecting a telescopic oil cylinder of a crane comprises a large-cavity pressure sensor (205), a small-cavity pressure sensor (206), a controller (203), a telescopic oil cylinder (213), and a telescopic oil cylinder regulator. Further disclosed is a method for detecting and protecting a telescopic oil cylinder of a crane, in which the large-cavity pressure sensor (205) measures the oil pressure in a large cavity of the telescopic oil cylinder (213); the small cavity pressure sensor (206) measures the oil pressure in a small cavity of the telescopic oil cylinder (213); the controller (203) controls an output electrical signal according to a large-cavity oil pressure fed back by the large-cavity pressure sensor (205) and a small-cavity oil pressure fed back by the small-cavity pressure sensor (206), and, by means of the electrical signal, controls a change of the amount of hydraulic oil flowing into and out of the large cavity and the small cavity of the telescopic oil cylinder so as to regulate the oil pressures in the large cavity and the small cavity.