The Development Of Ultrasonic Testing System Based On Cartesian Coordinate Robot

With the rapid development of modern industrial economy,the safety and reliability of metal bar and pipe are attracted more attention.Traditional portable flaw detector equipment has been unable to satisfy the user's request,the range of applications is narrow through traditional detection method,and it can't meet the requirements of different specifications of the workpiece,and also reduce the production efficiency.Therefore,the research on the ultrasonic automatic testing system for the on-line detecting of inner flaws on the materials has become the urgent demand.Under the background of production demand,the ultrasonic testing system based on Cartesian coordinate robot is developed in this paper.Based on the traditional inspection system for the bar workpiece,the mechanical and electrical technology have been combined in this paper to design an automatic ultrasonic inspection system which is designed for the workpiece with different diameters and lengths in a certain range.The double probe fixing device has been used,so this system can be used for ultrasonic and eddy current testing simultaneously.The mechanical and electric control parts of the ultrasonic testing system were designed in this paper which can realize the movement of the workpiece and the probe.It carry out the testing of the bar-shaped workpiece with different specifications was completed and good results were obtained.In this paper,the design scheme of the overall flaw detection for the rotating bar and linearly moving probe has been designed.The mechanical device including the Cartesian coordinate robot system and the roller carriage system have been designed.The driving of the probe and the workpiece were realized by using the stepping motor,servo motor,cylinder and other drivers.The ANSYS finite element analysis of Y-axis crossbeam,which is the main force component of Cartesian robot system,was carried out.The control part mainly uses SIEMENS PLC S7-1200 as the core control component,and combines with the SIEMENS V20 inverter to realize the movement of the mechanical equipment,which realized the automatic scanning of the workpiece.At the same time,the PLC is communicated with the IPC(Industrial Personal Computer)to acquire the ultrasonic echo signal of the testing system,which will form a complete automatic ultrasonic testing system to realize the helical flaw detection of the bar-shaped workpiece.After the inspection is finished,the IPC picks up the ultrasonic signal from the probe.At the same time,the inspection signal is sent to the PLC,waiting for the next cycle of flaw detection.The information of the size and position of the defects in the bar can be obtained from the software interface,so that the operators can accurately judge the flaw of the bar and provide the basis for improving the quality of production.The entire automatic ultrasonic testing system is developed from the user's point of view in this paper.The system is easy to operate,has fast detection speed and high detection accuracy,the various functions has been continuously tested and improved,so it can meet the needs of high level ultrasonic testing.