Title:
POSITION MEASURING DEVICE FOR UNDERGROUND DIGGING MACHINE
Document Type and Number:
Japanese Patent JPH0335114
Kind Code:
A
Abstract:
PURPOSE:To detect a position on the horizontal surface for an underground digging machine by providing a receiving device to receive AC magnetic fields generated from at least 2 pairs of transmitting devices and an arithmetic device to discriminate a received signal from the receiving device and calculate the position of underground digging machine. CONSTITUTION:An AC current with a frequency is supplied to a cable 10a and one with a frequency is supplied to a cable 10b respectively by AC power supplies 11a,11b to generate magnetic fields concentrically with the cables as the center. These magnetic fields are detected by magnetic field detecting elements S1,S2, and the voltages induced in the detecting elements by filters f1,f2 are discriminated which cable they are introduced from. Signals come from the filters f1,f2 are amplified by receiving amplifiers Am1,Am2 and converted to DCs to make an A/D conversion. Then, the X,Y positions are calculated from these signals by the arithmetic device 60. Further, a ditch depth and bearing angle for the underground digging machine are obtained from a signal of bearing detection device 50 and displayed 70.
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Inventors:
SAKANISHI SHOICHI
SHIBATANI KANJI
SHIBATANI KANJI
Application Number:
JP17042289A
Publication Date:
February 15, 1991
Filing Date:
June 30, 1989
Export Citation:
Assignee:
KOMATSU MFG CO LTD
International Classes:
E21D9/06; E21B47/022; E21D9/00; G01B7/00; G01C15/00; G01S5/00; (IPC1-7): E21D9/06; G01B7/00; G01C15/00; G01S5/00