Electromagnetic flaw detection device for bridge cables and its application

Abstract

The invention discloses a bridge cable electromagnetic flaw detection device and application thereof, and relates to the field of bridge cable nondestructive testing. The bridge cable electromagnetic flaw detection device comprises a sleeve. A plurality of magnet exciting coils are fixed to the outer wall of the sleeve, a plurality of grooves are formed in the inner wall of the sleeve, and each groove is internally and fixedly provided with a detection coil for detecting leakage magnetic flux at a broken wire position. A bridge cable nondestructive testing system comprises the bridge cable electromagnetic flaw detection device, an insulated gate bipolar transistor connected with the magnet exciting coils, a power supplying device connected with the insulated gate bipolar transistor, and a computer connected with the insulated gate bipolar transistor. A signal processing device is used for receiving and processing flaw signals sent by all the detection coils and sending processed flaw signals to the computer. The bridge cable electromagnetic flaw detection device is large in detection area, low in weight and capable of detecting high-altitude bridge cables which are difficult to arrive for people. According to the bridge cable nondestructive testing system, the detection sensitivity can be adjusted, and the detection accuracy rate can be increased.

Description

technical field [0001] The invention relates to the field of non-destructive detection of bridge cables, in particular to an electromagnetic flaw detection device for bridge cables and its application. Background technique [0002] At present, a large number of buildings represented by bridges adopt the cable system structure, and the non-destructive testing of the cables of important stress components has become an increasingly concerned issue in the safety and health of bridge structures. Because the length of these cables is very long and the overhead height is high, it is very dangerous to adopt a manual detection method and the detection effect is not ideal at the same time. It is a relatively safe and reliable technical means for robots to be equipped with non-destructive flaw detection instruments for detection, but the flaw detection instruments are required to be as light as possible, small in size, low in energy consumption, and reliable in data. [0003] A variet...

AI Technical Summary

Problems solved by technology

However, for bridge cables that are also steel wire ropes, this technical solution has encountered many problems in the detection of bridge cables: one is that the sensitivity of the Hall element is not high, and it must be as close as possible to the surface of the steel cable. The surface layer of the cable has a nearly one centimeter thick PE sheath

As the diameter of the steel wire increases, the volume and weight of the external permanent magnet and its fixed structure increase sharply, which is no problem for steel wire ropes that detect motion at a fixed location, but it is not suitable for bridge cables at high altitudes

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