An electromagnetic ultrasonic probe for non-destructive testing of water pipes

Abstract

An electromagnetic ultrasonic probe for non-destructive testing of water pipes, including a housing, a detection part, a rotating part arranged on the right side of the detection part, a signal processing part, an electromagnetic ultrasonic detection module, a depth detection module and a signal transmission transfer station are arranged in the detection part, and the electromagnetic The ultrasonic detection module includes balls, pneumatic expansion pipes and electromagnetic ultrasonic transducers; the depth detection module includes a laser ranging probe, a control circuit system and a rack. After the rack is driven by a gear driven by a servo motor, it can control the rotating part to realize Rotary forward; the pneumatic expansion tube includes a pressure sensor installed on the top of the ball, a rotating chamber, a screw rotor and a pressure pump that is movably connected with the screw rotor. It can detect the damage of pipelines with different diameters, use pneumatic expansion to fit the surface of the inner wall of the pipeline, and use electromagnetic ultrasonic transducers to perform nondestructive inspection on pipelines, and move smoothly, making the nondestructive testing effect more accurate.

Description

technical field [0001] The invention relates to the field of nondestructive testing, in particular to an electromagnetic ultrasonic probe for nondestructive testing of water pipes. Background technique [0002] The urban underground pipe network is the deep underground blood vessel of the city, which plays an important role in urban construction. Water supply pipelines, drainage pipelines, natural gas pipelines, etc. are all buried underground for a long time and each plays a different role. Due to the relatively backward planning of urban underground pipelines in the early days, the distribution of them was complicated and buried deep underground, which made it difficult to manage the pipelines uniformly, and also created many problems for the subsequent construction of new cities. Leakage of underground pipelines easily caused by overdue service, aging pipelines, geological changes, poor construction, etc. is a huge challenge in the operation and maintenance of pipeline n...

AI Technical Summary

Problems solved by technology

Therefore, the workload of daily manual inspection and on-board inspection of pipe network leakage is very heavy, and timely detection of leakage cannot be achieved.

[0004] In addition, the permanent magnets of the existing electromagnetic ultrasonic probes are single-stage or reverse multi-stage arrangement type, but no matter what kind of permanent magnets, the change in quantity is to improve the magnetization of the workpiece to be tested, but there is no way at all. To solve the problem of magnetic field line scattering, as the distance between the electromagnetic ultrasonic probe and the workpiece to be tested increases, as long as the change is in millimeters, the magnetization intensity will decrease exponentially, and the experiment proves that the magnetic ripple on the workpiece to be tested is scattered in a ring, and the ring The magnetization of the center and the outside of the ring is the weakest, so how to gather the magnetic force lines to increase the magnetization of the workpiece to be tested is a technical problem that needs to be solved urgently

[0005] Because the AC-DC conversion of the signal source and the stability of the signal source affect the detection effect, such as CN 105465614 A mentioned using a leak detection device to detect, when the whole or the outer insulation layer is damaged, the insulation resistance to the ground changes, but this During the detection process, the process of signal transmission and information processing is relatively complicated, and it is prone to interference, which affects the stability and accuracy of the detection, and the pipe wall cannot be inspected in all directions, and loopholes will easily appear, so it is necessary to conduct Improve

Images