A more efficient inspection method, which is absolutely reliable, involves the use of non-contact laser scanners from Micro-Epsilon. Slovak company Tipteh has developed an inspection system using laser line triangulation sensors for fast, fully automatic inspection and is already being used for the inspection of the received beer bottle crates. This inline inspection system is equipped with five scanCONTROL 2900-50 laser scanners from Micro-Epsilon. In the production line, the scanners measure from above onto the crates which are moved along a conveyor belt. Each scanner measures a row of bottles in the crates. Presence detection is carried out at conveyor speeds of up to 850 mm/s. Compared with solutions based on conventional image processing systems, laser scanners not only monitor the presence of a bottle but also the height of the bottle. The sensor uses the respective bottle height to determine whether the correct type of bottle is in the crate. The bottle height must not deviate by more than 3mm from the target height of the respective bottle type.
The PLC receives the result of the evaluation as an »OK« or »not OK« value, whereby any faulty crates can be removed directly from the production line. The user can also output the measured results via an integrated display on the control unit.