APPARATUS FOR DETECTING BREAKAGE OF STEEL CORD IN STEEL CORD CONVEYOR BELT USING U-TYPE CORE

摘要

Purpose a: device, for detecting the rupture of an all-steel cord in a steel cord converor belt, it is arranged to prevent to reduce the rupture due to all-steel cord in terms of the service life of band and operation failure, by detecting whether that all-steel cord is broken in the band using the non-contact type magnetic coil pickoff using a u shaped core. Construction: one is applied to an excitation coil (3) from the exciting signal that exciting power supply (2) generates to generate a magnetic flux, it is used to be attached, the all-steel cord (1) in a steel cord converor belt of a lower part of a return belt of conveyer belt. The magnetic flux generated in excitation coil (3) is by a u shaped core (5) examined all-steel cord (1) and constructs a magnetic flux closed-circuit. Then, one sensing coil of a voltage import feature (4). That is, the u shaped core (5) and exciting and sensing coil (3, the 4) impairment of the constitution on u shaped core (5) are at a magnetic coil pickup. One peak value (a) of an output waveform (6) for the quantity relative to the connection magnetic flux in sensing coil (4) is filtered through a bandpass filter (16). Filter signal amplification is changed to the direct current value of a conversion in a signal amplifier (17) and by an AC-DC converter (18). One sensitivity controller (19) establishes a susceptibility of the direct current value of the conversion of alternating current, induces in the sensing coil (4) ruptured very much. One signal comparator (20) compares a sensitivity control signal (10), the direct-flow output signal (9) of the conversion with sensing coil. By value be entered compared with the determined microprocessor (22) of wherein level of breakage by an A/D converter (21). Determining result is indicated on a display (23).