A portable ultrasonic guided-wave phased array bolt detection system

Abstract

The invention relates to a portable ultrasonic guided-wave phased array bolt detection system. The system includes an ultrasonic guided-wave phased array bolt detector and a bolt probe. A bolt to be detected includes a screw rod and a bolt end. The system is characterized in that the detector includes a computer, a signal collection module and a display module; the bolt probe is arranged on the bolt end of a bolt fastener to be detected and a wire leads out; and the wire is connected to the detector. The detector and the bolt probe cooperate to generate a cylindrical guided wave signal in thebolt fastener to be detected through combination of an ultrasonic phased array technique and a piezoelectric guided wave technique so as to achieve imaging detection. Through detection at one point, one-time, rapid and efficient detection imaging of the whole structure of a bolt fastener on active service is achieved, including A image scanning, B image scanning and 3D defect model building, and positioning and data storage of inner defects of the bolt fastener can be achieved.

Description

technical field [0001] The invention relates to a bolt defect detection instrument, in particular capable of one-time real-time imaging detection of defects on in-service long-stem bolt fasteners. The invention belongs to the technical field of ultrasonic nondestructive testing. Background technique [0002] Bolt is one of the standard accessories in industrial equipment. As a connecting piece of various equipment, it has the advantages of simple construction, good mechanical performance, removable, fatigue resistance, and no loosening under dynamic load. It is often used in complex Working under various harsh conditions such as stress, high temperature and high pressure, and periodic vibration, fatigue cracks are prone to occur. In order to ensure the safety of industrial production, we must find crack defects as early as possible so that they can be replaced in time. Therefore, how to detect smaller crack defects and find defects faster and more conveniently has always b...

AI Technical Summary

Problems solved by technology

[0006] The number of bolt fasteners is huge, and the number of bolt fasteners to be inspected in one inspection cycle can reach thousands. The detection method of traditional ultrasonic single probe direct longitudinal wave is inefficient, so random inspection is often used for safety assessment, which cannot be comprehensive and effective Potential safety hazards of ground control bolts

[0007] Most of the geometric shapes of bolt fasteners are slender structures, and the side wall interference effect is strong when the ultrasonic single probe is used for direct longitudinal wave detection, which leads to a decrease in sensitivity, and it is very easy to miss detection and other situations, causing safety hazards

[0008] Only one end surface of the in-service bolts such as fan blades and buried anchors is exposed outside. When the conventional ultrasonic testing method is used to detect, the other end buried inside has low detection results.

Unable to effectively evaluate the overall safety of bolt fasteners

[0009] At present, the length of bolt fasteners used in service can reach 1200mm. When the existing conventional ultrasonic testing methods are used to detect one end of the bolt in service, the energy of the ultrasonic wave is likely to be greatly attenuated, and effective detection cannot be carried out.

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