Research On Fault Location And Identification Technology For Conventional Defects Of Crane Loading Parts

With the high-speed development of China economy and the arrival of industrial 4,lifting machinery will be applied to the large-scale engineering project,which plays an important part in carrying heavy machinery as the lifting support,rotation and other operations,its safety and damage degree can get timely detection and evaluation and repair related to crane safety problems.The loading parts of hoisting machinery are easy to produce micro cracks in the stress concentration area,resulting in potential safety hazards,even breaking,collapse and other major events.Therefore,it is of important theoretical and practical significance to carry out nondestructive identification and fault location research on the conventional defects of lifting machinery bearing parts.Acoustic emission technology is a non-destructive testing technology developed in recent decades.It has a broad application prospect in the fields of industrial manufacturing,petrochemical industry and so on.Compared with other detection technology,acoustic emission detection is suitable for almost all materials,and can obtain the dynamic information of material damage process,it can detect the material or component of the "active" defects,which may provide for the safety evaluation of materials or components.However,the nondestructive testing of crane bearing parts is still in the initial stage of exploration,and the relevant standards and industry standards have not yet been formulated in the country.In this paper,SDAES acoustic emission detector and GPS-100 high frequency fatigue tensile testing machine are used to collect and analyze the acoustic emission signals of the conventional defect specimens of Q235,the commonly used material for lifting machinery:(1)Referring to the relevant standards of acoustic emission testing,and referring to the fixture characteristics of the test machine,the corresponding standards have been made no defects,crack defects and other specimens,and according to the loading characteristics of the test machine,the corresponding loading scheme is worked out.(2)The acoustic emission test of specimens without flaw and crack under tensile load,the characteristic data of AE signals under tensile loading were collected,and the corresponding waveform characteristics were summarized.The AE signal characteristics of two different sizes of crack defects were summarized,compared and evaluated,and the fault location maps were summarized and analyzed.(3)Starting from Q235 Metal Crack Acoustic emission testing,the acquisition of metal materials Q235 crack method in different stages of AE damage,and the use of pattern recognition method to identify the crack stage and severity,risk assessment and analysis of qualitative and quantitative lifting bearing parts for dangerous source.