I. Direct Observation Method: Observe the running trajectory. While the equipment is running, visually inspect whether the distance between the edge of the conveyor belt and the frame guide rails or idler supports is uniform.
If the gap on one side is significantly reduced and the gap on the other side is increased, and this continues to widen with operation, misalignment has occurred. The amount of misalignment is generally judged by the belt edge extending beyond the idler end face or deviating from the center line by more than 5% of the belt width (e.g., for an 800mm wide belt, a deviation exceeding 40mm is abnormal).
✅ Recommendation: Observe 1-2 complete cycles under no-load and heavy-load conditions to confirm whether the misalignment is stable or related to the operating conditions.
II. Check for Physical Damage. Long-term misalignment will leave "evidence" on the equipment:
Openings, wear, or curling at the conveyor belt edge: Indicates long-term friction with the frame;
Obvious scratches on the idler end face or side guard plate: Indicates the belt has come into contact with non-running parts;
Severe wear on one side of the roller's rubber coating: May be due to excessive local stress caused by belt misalignment.
These traces can be detected even when the machine is stopped, providing crucial evidence for diagnosing chronic belt misalignment.
III. Utilizing Monitoring Devices for Judgment Modern conveyor systems are often equipped with automated detection methods:
Belt Misalignment Sensors: Installed on both sides of the belt, they output a switch signal to alarm or shut down the machine when the misalignment exceeds a set threshold;
Machine Vision Systems: Use cameras to identify the belt edge position in real time, combining AI algorithms (such as YOLOv5 instance segmentation) to accurately calculate the misalignment, achieving mAP of up to 99.0%;
Laser Rangefinders: Non-contact measurement of belt edge distance, data is input to the PLC for dynamic monitoring.
For large production lines, this type of intelligent monitoring can provide early warnings, preventing escalation of faults.
IV. Analyzing Misalignment Patterns Based on Operating Conditions Determine the nature of the misalignment based on the conditions under which it occurs:
No misalignment under no load, misalignment under heavy load → Incorrect material drop point or misalignment of the guide chute;
Constantly misaligning to the same side → Improper roller installation or uneven tension;
Unpredictable direction, swaying left and right → Belt slack or improper joint.
