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    • 3. 发明专利
    • SELF-PROPELLED DUCT CONTINUITY TESTING DEVICE
    • JPH0847130A
    • 1996-02-16
    • JP20027494
    • 1994-08-03
    • TOKYO ELECTRIC POWER COKANTO DENKI KOJI
    • NAKATANI MASAOKANEKI KIYOSHIABE HIDETOSAKAKIBARA YASUSHI
    • H02G1/08
    • PURPOSE:To obtain a self-propelled duct continuity testing device in which a bobbin can be passed inside a duct by one operator by a method wherein a self-propelled front tractor and a self-propelled rear tractor whose cross-sectional diameter is a little smaller than the cross-sectional diameter at the inner circumference of the duct are installed at the front and the rear of the bobbin and the respective tractors are operated by an operating machine. CONSTITUTION:Driving gears for a front tractor 3 and a rear tractor 4 are driven by the operation of an operating machine in a radio manner or via a wire 5; Thereby, wheels 8 are turned, and the front tractor 3 and the rear tractor 4 are run inside a duct 7. Thereby, a bobbin 1 which is coupled via joint mallets 2 in the middle of both tractors 3, 4 is run inside the duct 7. When the bobbin 1 or the like reaches one end of the duct 7 or when an obstacle exists inside the duct 7, the wheels 8 are turned reversely so as to be run backward. Thereby, the bobbin 1 is set to continuity inside the duct 7, and it is confirmed whether the inside of the duct 7 is deformed or an obstacle exists inside the duct. Thereby, the bobbin 1 can be passed through the inside of the duct 7 by one operator.