Reversibly accurate and automatic large-stroke detection method and device of pipe cable

The invention discloses reversibly accurate and automatic large-stroke detection method and device of a pipe cable. The device comprises an engine base, eight limiting wheels, two tensioning wheels, a counter wheel, a pressing and limiting wheel, a gear counting sensor, an approach switch and a sensing element. The device is characterized in that judgment of a measurement and movement direction of the pipe cable can be achieved by use of the approach switch and the sensing element; reversible measurement is achieved; reversible measurement is achieved; the positions of one counter wheel and a tensing wheel in each pair of limiting wheels can be automatically adjusted; measurement of pipe cables in different diameters can be met; the pressing force of the pipe cable is adjusted; the pipe cable is prevented from slipping; the reliability and the accuracy of pipe cable measurement can be improved by use of two counting sensors, and the reliability of the pipe cable detection is increased by using a PLC (programmable logic controller). The method and the device are advanced, scientific, strong in practicability, simple in structure, and suitable for special environments such as aviation, and reversibly accurate and automatic large-stroke detection of the pipe cable can be met.