A non-destructive testing device and method for a carbon fiber composite core conductor mandrel

Abstract

The invention provides a non-destructive testing device and method for a carbon fiber composite core conductor rod. The equipment consists of four parts: excitation probe, wire positioning device, oscillation signal pickup probe, and oscillation signal analyzer. After positioning the wire to be inspected, the equipment uses the vibration probe to emit vibration waves of a specific frequency to radiate the composite material mandrel inside the wire; the transmitted feedback vibration wave signal is collected by the vibration signal pickup probe, and the pickup probe The collected signals form a continuous spectrum and are digitized. Finally, the processed signal spectrum is compared with the standard digital spectrum by an oscillation signal analyzer, and the analysis result is obtained through the database analysis software, so as to detect the damage of the specific position of the mandrel. This equipment can be widely used in the non-destructive testing of carbon fiber composite wire mandrels. The analysis process is fast and convenient, the detection process is convenient, and there is no damage to the mandrel.

Description

technical field [0001] The invention relates to a detection method for a carbon fiber composite wire mandrel, in particular to a device and a method for detecting damage to an internal composite material core rod of a carbon fiber composite material wire mandrel by means of ultrasonic radiation at a specific frequency. Background technique [0002] The carbon fiber composite wire mandrel is an important part of the high-voltage wire used in the field of power transmission. Its main function is to replace the metal steel core in the steel-reinforced aluminum stranded wire. The strength, rigidity and environmental adaptability are strong, which can effectively reduce the sag deformation of high-voltage transmission lines between long-distance towers. There are many quality and life problems brought about by replacing the metal core. [0003] However, as a mandrel made of new composite material, there are many problems in the process of use or construction and wiring. The most...

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Problems solved by technology

[0003] However, as a mandrel made of new composite material, there are many problems in the process of use or construction and wiring. The most typical and main one is the surface and internal damage of the carbon fiber composite mandrel. This damage may be caused by the product preparation process. It may also be caused by the imperfection of the construction process in the wiring process. If the defect damage is not discovered and dealt with in time, it will inevitably bring hidden dangers to the stable use of the transmission line.

[0004] In view of the multi-layer structure of the current high-voltage transmission line, the carbon fiber composite mandrel has a thicker wrapping layer of aluminum stranded wire and an outer insulating layer, so once the line is erected, it is difficult to find the inner core of the composite material rod. Damage problem, traditional visual or surface detection methods cannot achieve the purpose of timely detection of damage

At present, there are almost zero researches and methods on the detection and processing of this multi-layer high-voltage transmission line at home and abroad, especially the detection of carbon fiber composite wire mandrels is difficult.

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