The invention discloses a method and a device for demagnetizing a steel wire conveying belt without
energy consumption. The method comprises the following steps of: a) allowing the moving direction of the steel wire conveying belt to get into an alternating
magnetic field formed by a demagnetizing plate, wherein the distance between the demagnetizing plate and the steel wire conveying belt can be adjusted; b) adjusting the distance between the demagnetizing plate and the steel wire conveying belt, and measuring the
magnetic field intensity on the back surface of the steel wire conveying belt, if the measured value of the
magnetic field intensity is more than 200 Gs, the distance is qualified; c) adjusting the distance that the steel wire conveying belt departs from the demagnetizing plate, acquiring a detection
signal through a
metal detector, inputting the detection
signal into an oscillometer, and observing whether interference pulse exists or not and the
peak value of interference
pulse wave, if a waveform curve is flat, demagnetization is qualified, and when the waveform curve is abnormal, adjusting the current distance until the detection
signal is qualified; and d) after adjusting the current distance until the detection signal is qualified, starting a steel wire conveying
belt machine set to perform demagnetizing operation, wherein in the process, the
metal detector extracts the detection signal to analyze the whole periphery of the conveying belt to judge a demagnetizing effect. The problem about demagnetizing the steel wire conveying belt is solved by the method and the device, and the method and the device have the characteristics of no maintenance,
energy conservation and the like.