Machine vision on-line inspection technology can be divided into fixed type and dynamic type from installation mode; vision inspection system can be divided into two ways: camera photographing system and laser system in terms of measurement method; and it can be divided into positioning detection function, size detection, surface detection and function matching from the application field.
In the automatic automobile production line, the vision inspection system needs to match with the robot when necessary, and establish the connection with the PLC control system of the production line, so as to realize the functions of measurement, detection, positioning and identification.
The visual inspection system has the following characteristics: the non-contact measurement method is adopted to improve the corresponding speed, and has little impact on the production line; it has the performance of long-time stable and reliable repeated work, which is suitable for continuous assembly line operation of automobile; it is suitable for working in areas with high safety risk, poor human and mechanical engineering and poor environment. Many advantages make the visual inspection system in the automotive industry has been widely used.
The working principle of vision measurement system: using plane laser to irradiate the surface of the object to collect two-dimensional plane data; using laser line to irradiate the measured object to collect the third dimensional data; analyzing the collected data through professional software; obtaining the displacement, deformation and other geometric characteristics changes of the measured object or characteristics through relevant algorithms.
Robot assembly precise positioning, in the field automation station, such as top cover installation, robot laser welding, door cover installation and automatic gluing and other processes, need to carry out accurate positioning first. The robot will analyze the positioning data and then operate correctly to achieve the stability of the process. This kind of positioning adopts the way of laser measurement, and usually adopts the fixed mode.
Online door cover profile detection usually uses camera system or laser surface scanning to detect the outline or characteristics of external panel, which reduces the problems of manual handling and offline, and realizes 100% online detection. Surface scanning is also a testing method that trigger measurement equipment cannot completely replace.
In addition, the online detection equipment can also measure and monitor the trajectory and position of the robot, and set the alarm limit for the deviation of the trajectory, so as to realize the automatic monitoring.
Machine vision on-line inspection system is an indispensable equipment in the process of increasing the automation rate of the automobile industry. Several methods of use introduced in this paper are relatively mature in practice, which effectively guarantee the accuracy of product in size control, precise positioning, function matching and automatic detection. It will be applied in a wider field in the future, in order to achieve higher self-improvement Dynamic, more refined quality and other aspects play a huge role.
Robot 3D vision guidance system, product appearance inspection system and other intelligent products can be customized according to customer requirements. In an efficient, low-cost, modular way for automation integrators, automation equipment manufacturers, robot manufacturers to provide machine vision detection system technology related solutions.