Uliflex: Why Industrial Belts Deviate on Machines

The deviation of polyurethane industrial belts is indeed a common and tricky problem. Uliflex is here to help you sort out the core reasons and coping strategies. Based on Uliflex's years of experience in the polyurethane industrial belt industry, deviation is usually caused by uneven stress or mechanical deviation, which can be specifically classified into the following categories:

1. Mechanical installation and structural issues

Misalignment of Roller/Idler:‌ If the shaft axis of a roller or idler is not perpendicular to the conveyor centerline, or if the shaft axes of multiple rollers are not parallel, it will cause uneven belt loading and result in tracking issues. When the installation error of the drive roller exceeds 0.5°, the belt's lateral deviation can reach up to 15% of its belt width. Similarly, offset of the idler group centerline will also cause localized tracking problems. A customer of Uliflex from the automotive manufacturing industry experienced periodic tracking issues for three consecutive months due to deformation of their idler.

Skewed frame centerline: Misalignment of the conveyor's overall rack centerline, whether due to uneven installation or a non-straight centerline, will directly cause the belt's running trajectory to deviate. When troubleshooting belt tracking issues, it's also important to check whether the ground where the machine is placed has settled, as this occasional event can also lead to belt deviation on the machine.

Idler Failure:‌ Idler not rotating, bearing damage, or non-circular surface will lead to localized support force abnormalities, causing deviation.

2. Quality and Condition Issues of the Belt Itself

Belt quality issue:Uneven belt material, uneven joints, or other deviations will cause uneven tension distribution during operation, leading to tracking issues and frequent machine stoppages.

Belt Aging and Wear:‌After prolonged use, belt elongation deformation, edge wear, or slackness will make it unable to run stably on the rollers.

Joint Issues: Belt joints that are not smooth, straight, or have deviations are a common cause of tracking problems. When the above conditions occur, the belt cannot be repaired and must be replaced. Uliflex recommends customers replace the belt promptly to avoid impacting daily production.

3. Material and External Environmental Factors

Material Loading Issues: Piling material on one side of the belt generates lateral forces, causing uneven loading and resulting in tracking deviation. When this occurs, it is necessary to promptly disperse and level the material to allow the belt to run smoothly.

Environmental Factors Influence:‌ Environmental factors such as high temperature, humidity, or oil contamination may cause the belt to slip, age, or experience changes in the coefficient of friction with the rollers, thereby inducing tracking deviation. If the machine operates in a production environment frequently exposed to oil contamination, the oil can increase the belt's deviation by 40%.

External Interference:‌ Vibration around the conveyor, foreign objects jamming in, or worn scrapers may also cause uneven belt loading.

4.Size matching issues

Size mismatch: The mismatch between the belt width, length, or interface size and the equipment can lead to uneven stress during operation, especially in scenarios where high dimensional accuracy is required, such as in the food industry. Uliflex has found that if the belt width error exceeds 2mm, the belt's offset increases significantly during high-speed operation.

5. Inadequate maintenance and management

The lack of regular inspections can amplify the risk of deviation. A steel enterprise failed to promptly clean the accumulated material on the idlers, leading to a gradual deterioration of the belt deviation from 2mm to 15mm. Incorrect adjustments such as tensioning force can also cause deviation. For example, a chemical plant once experienced a belt deviation of up to 20% of the belt width due to uneven tensioning force.

Solution approach

Addressing belt misalignment issues typically involves a step-by-step approach: first, inspect and rectify the misalignment during no-load conditions, followed by adjustments during heavy-load conditions; starting with mechanical installation and structure, then proceeding to check the condition of the belt and material loading. Specific measures include adjusting the position of the drums, replacing aged or damaged belts, and optimizing the material loading method.