WEAR DETECTOR OF CUTTER BIT OF SHIELD EXCAVATOR

PROBLEM TO BE SOLVED: To detect the wear of the cutter bit of a shield excavator by a device in which failure does not occur in a simple constitution. SOLUTION: A magnetic substance core 20 around which a primary side coil 26 and a secondary side coil 27 are wound is housed in the inside at a prescr...

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Bibliographische Detailangaben
Hauptverfasser:	MUKOYA TSUNEMATSU, INADA YOSHIKAZU
Format:	Patent
Sprache:	eng
Schlagworte:	EARTH DRILLING FIXED CONSTRUCTIONS GALLERIES INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES LARGE UNDERGROUND CHAMBERS MEASURING MEASURING ANGLES MEASURING AREAS MEASURING IRREGULARITIES OF SURFACES OR CONTOURS MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS MINING PHYSICS SHAFTS TESTING TUNNELS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To detect the wear of the cutter bit of a shield excavator by a device in which failure does not occur in a simple constitution. SOLUTION: A magnetic substance core 20 around which a primary side coil 26 and a secondary side coil 27 are wound is housed in the inside at a prescribed position of the cutter head face plate of a shield excavator to expose a part of the core 20 to the cutting front face, and a wear detection head 10 as a detection head part 21 is fixed thereon. The wear amount of the part 21 is detected by applying alternating voltage to the 26 and using output voltage of the coil 27 obtained from the magneto-resistance value of the magnetic circuit of the core 20 changed by the wear of the part 21.