I. Quick Diagnosis of Common Causes of Belt Misalignment
1. Uneven Tension: Belt misaligns to the same side under both no-load and heavy-load conditions → Check if the tensioning device is balanced on both sides.
Rack Installation Error: Belt misalignment at the head or tail rollers → Roller axis not perpendicular to the frame.
2. Idler Roller Issues: Localized misalignment in a fixed position → Idler roller jamming, material sticking, or bracket deformation.
3. Material Impact: Misalignment only under heavy load → Improper material drop point causing uneven load.
4. Belt Problems: Improper joint, aging, deformation, or edge wear → Structural imbalance causing continuous misalignment.
II. Practical Adjustment Methods (Classified by Scenario)
1. Adjusting the Tensioning Device: If the belt continuously misaligns to one side, it indicates that the tension on that side is too loose.
Operation: Adjust the tensioning screw or counterweight to appropriately tighten the loose side and slightly loosen the tight side until the tension on both sides is balanced.
Verification: Observe whether the belt is centered during operation to avoid excessive tension that could damage the bearings.
2. Correcting the Roller Position
Head Roller Adjustment Method:
If the belt deviates to the right → move the right bearing seat forward, or the left bearing seat backward;
If it deviates to the left → move the left bearing seat forward, or the right bearing seat backward.
Tail Roller: Adjust in the opposite direction to the head roller.
Note: Ensure that at least 2–5 main roller axes are parallel and perpendicular to the frame centerline.
3. Adjusting the Idler Roller Assemblies
If the belt deviates to one side, move the idler roller assembly on that side forward 1–2 cm in the running direction, or move the other side backward.
Utilize the principle of "running backward, not forward," to create a guide angle on the idler rollers, pushing the belt back to the center.
4. Removing Adhesives
Foreign objects such as slag and wet material adhering to the surface of the rollers or idler rollers → increase diameter → increase tension → cause belt deviation.
Solution: Stop the machine for cleaning and install a V-shaped sweeper or gravity-feed cleaning brush to prevent material accumulation again.
5. Optimize Material Drop Point: Off-center material drop generates lateral impact force, leading to uneven belt tension.
Improvement: Add guide plates or baffles to ensure material falls centered on the belt.
6. Install Automatic Deviation Correction Device:
Self-aligning idler groups: Such as vertical rollers or trough-type idlers, which automatically generate lateral thrust to correct the direction when deviation occurs.
Intelligent System: Employs AI vision detection + differential control system to identify deviation in real time and automatically adjust the belt alignment in conjunction with the actuator, improving accuracy and response speed.
7. Repair or Replace the Belt: Misaligned joints, severe edge wear, or internal structural deformation → cannot be corrected by external adjustment.
Solution: Re-vulcanize the joints or replace the belt with a new one to ensure overall flatness and symmetry.
