Cylinder Wall Uniformity Online Inspection System

Cylinder has large-scale application in the mechanical, energy, military and other fields. But in the process of cylinder production , usually using the traditional manual offline detection methods to testing. In order to improving the speed of cylinder testing, the factory very urgently need to achieve cylinder-line detection method and system. However, because of cylinder's one end closed, and at the high temperature production site, the existing machine vision detection method and system is difficult to achieve real-time online test cylinder. This paper put forward a method of vision-based one end closed cylinder wall geometric parameters on-line measurement, an imaging agency with special structure is designed, by processing the spot image which is formed by the laser reflector and reflects the cylinder wall geometry change, cylinder wall geometric parameters change information is accessed.According to the machine vision theory, testing the inner wall of the cylinder, this paper proposes a method based on laser triangulation distance measurement, using the new imaging method . This method adopt the specula change the direction to the laser light path, the laser light perpendicular raying to the cylinder wall surface to form a cylindrical wall geometry changes to reflect the spot image, using the prism of the laser spot image imaging. This method can achieve the vertical injection laser, image vertical spread. On the one hand, the method can detect the cylinder wall integrity, even close to the cylinder closed end of the inner wall of the remote also allows detection; the other hand, the method of electronic imaging equipment needed to set up away from the cylinder under test, production environment to meet high demands long hours.In order to meeting test requirement, progressing circle detection of accurate positioning to the cylinder wall, this paper design a set of mechanical system. The system used to secure the optics devices and electron devices; precisely control rotation angle of be tested cylinder and rotate speed; precisely control the horizontal shift of detecting device, and can be adjust its vertical height, to achieve the best detection result. Designed stepper motor driver application circuit and Single Chip Microcomputer control circuit, and compiled the SCM procedures, finished to communicate with the upper computer. Matching image processing and testing procedures, so that the whole system detect capacity can reach requirement of precisely position, and let the system can reach to PC visual control requirement to the detecting position. All the mechanical devices and components coordinate with each other, and ultimately achieve a demonstrate model prototype.of real-time online detection.To laser spot center positioning algorithm as object of study, compiled the procedure of spot diagram collected images with detecting system automatically change into spot position data. Through the experiment of the model prototype, the final data show that the system towards to inner wall size detecting resolution ratio, can up to 0.1mm/pixel, detecting range of inner wall size can up to 16mm. The repeated measurement data to cylinder wall at the same location , basically described the same change of degree of uniformity.