Rotation Correction

The forest industry is continually looking for ways to reduce costs and improve fiber recovery. To that end, errors associated with log rotation systems have been identified as an area for potential improvement. These errors may be a result of log slippage while being held in the turning rolls, poorly calibrated or poorly performing turning roll setworks and other mechanical shortcomings. The basic goal of a rotation correction system is to ensure the log is actually rotated the amount specified by the optimizer.

Porter has developed an Automatic Rotation Correction System utilizing Hermary DPS 4024S2 laser scanners. The scanners, mounted near the log turner, compare log shape data captured on the Automatic Rotation Conveyor to that being scanned by the Automatic Correction Scanners to determine the present angle of the log after the initial rotation. The system calculates the difference between the actual and desired angles of rotation, which is then transmitted to the PLC. The PLC then provides a corrective turn through the hydraulic positioners on the turning rolls. Depending on machine configuration and design corrective turns may be applied more than once before the turning rolls release the log.

This system can be fully integrated with our Optimization Systems.