Conveyor Belt Tracking via Drum Displacement
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Solution Overview
Problem
Conveyor belt tracking systems fail to maintain high accuracy at high velocities, particularly in applications like printing technology where precision is critical, as existing methods rely on angle adjustments that are inadequate for fast-moving belts.
Innovation Solution
The method involves displacing one of the rotatable drums sideways in the direction of belt travel to directly adjust the belt's position, using a rotational movement about a pivot point in an orthogonal plane, and then moving the drum back to its original position at the same velocity as the belt moves, ensuring the belt remains aligned without changing its position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the drum axis angle is adjusted to make the belt wander to the desired position, then the belt tracking is achieved, but the adjustment accuracy deteriorates at high velocities
Solution Approach 1:
Instead of adjusting the drum axis angle to make the belt wander to the desired position, the patent inverts the approach by directly displacing the drum sideways in the direction of belt travel. This direct displacement method allows the drum to push the belt immediately to the desired position without relying on angle-induced wandering, thereby maintaining high accuracy even at velocities of 200 m/min or more.
Solution Approach 2:
The patent changes the control parameter from drum axis angle adjustment to direct sideways displacement of the drum. By using a pivot point positioned at a distance from the drum (at least as long as the belt width), the system achieves large-radius rotational movement with flat curvature, enabling precise belt position control through drum displacement rather than angle modification.
2Productivity
If the drum is displaced sideways to directly adjust the belt position, then the adjustment speed is improved, but the device complexity increases
Solution Approach 1:
The patent introduces a new dimension by positioning the pivot point in an orthogonal plane along the center of the belt at a distance from the drum. This spatial arrangement allows the drum to rotate about a remote pivot point, creating a lever arm that amplifies the displacement effect. The pivot point distance (at least equal to belt width) ensures flat curvature of the rotational path, simplifying the mechanical implementation while achieving rapid direct belt position adjustment.
3Measurement precision
If the drum is moved back to the desired position continuously, then the belt tracking accuracy is maintained, but the use of energy increases
Solution Approach 1:
The patent employs continuous feedback control where the PLC receives constant position and velocity signals from sensors and adjusts the drum displacement accordingly. The system monitors belt position and drum velocity in real-time, enabling the drum to move back to the desired position at the exact speed needed to counteract belt wandering. This closed-loop feedback ensures high tracking accuracy while optimizing energy consumption by avoiding excessive or unnecessary drum movements.
Data Source
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AI summary
Method of adjusting and tracking an conveyor belt arranged around at least two rotatable drums, the belt having a direction of travel along its length and orthogonally an axis of the at least two drums, whereby the adjustment of the belt is made by displacing at least one of the drums sideways seen in the direction of travel of the belt and thus the belt so that the belt directly gets into a desired position. A conveyor belt tracking arrangement, the drums are arranged with their axles in a frame and at least one drum is arranged with its axle in a pivot frame and the pivot frame is in turn adjustably arranged in the frame, and movable by means of a drum moving force, which in turn makes the whole drum, with the belt, to move with the pivot frame around a pivot point provided in an orthogonal plane along the centre of the belt seen in the direction of the belt at a distance from the drum, so that the belt is directly moved to a desired position.