Ultrasonic circumferential automatic detection device and detection method for polyolefin composite pipe joints

Abstract

The invention relates to the field of ultrasonic detection of an electric welded joint and aims at providing a device and a method for automatic circumferential ultrasonic detection of a joint of a polyolefin composite tube. The automatic circumferential ultrasonic detection device comprises an ultrasonic detection instrument, a probe, a probe clamping device, an encoder, an inner clamp, an outer clamp, a small gear, a stepping motor and a control module; the method is used for detecting the joint of the to-be-detected tube, and finally a C-scanning image is formed through the ultrasonic detection instrument and displayed. According to the invention, a phased array focusing technology is adopted to solve the problem of too weak echo caused by excessive acoustic attenuation; a special coupling agent is chosen, so that the loss of interface sound transmission is minimized or even no loss is produced during the detection conducted with a contact method, and a special scanning device is developed to form the real-time C-scanning image.

Description

technical field [0001] The invention relates to the field of ultrasonic detection of electrofusion joints, in particular to an ultrasonic circumferential automatic detection device and detection method for polyolefin composite pipe joints. Background technique [0002] Pipeline transportation is an economical and safe transportation method, which is widely used in various departments such as petroleum, electric power, coal, chemical industry and urban water supply. At present, the traditional pipes used in my country mainly include metal pipes and polyolefin pipes. Due to the characteristics of the material itself, the strength of the metal pipe has the advantages of high rigidity and mature connection technology, but it has the disadvantages of being easy to rust and corrode; the polyolefin pipe has the advantages of large flexibility and corrosion resistance, but it has low strength and low rigidity and other shortcomings. In order to overcome the inherent defects of the...

AI Technical Summary

Problems solved by technology

The traditional ultrasonic testing of polyolefin composite pipe joints is mostly manual operation, labor-intensive, and the test results are greatly affected by human factors

At the same time, because the specification and size of the polyolefin composite pipe electrofusion sleeve is very different from that of the polyolefin composite pipe pipe, a special lengthened and thickened electrofusion sleeve is usually used, and the width of the resistance wire cloth is very large. If scanning is used for manual detection, It is time-consuming, and the quality information of the entire fusion surface cannot be obtained

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