Maintenance and Repair of Bucket Elevator Conveyor Belt

Maintenance and Repair of Bucket Elevator Conveyor Belt

1. Daily Maintenance

• Regular inspection
Check the belt surface for cracks, rubber wear, exposed steel cords, bulge, delamination or abnormal wear patterns. Inspect bucket bolts to ensure they are tight and not cutting into the belt.

• Cleanliness control
Remove sticky materials, coal dust, ore powder or debris from the belt surface, pulleys and bucket bases to avoid uneven stress and accelerated abrasion.

• Tension monitoring
Maintain proper belt tension. Excessive tension causes steel cord fatigue; insufficient tension leads to slip, eccentric wear and bucket impact.

• Pulley and alignment check
Ensure pulleys are clean, lagged properly and aligned correctly. Misalignment causes belt deviation and edge damage.

• Lubrication of related parts
Keep bearings and tension devices well lubricated to avoid vibration that damages the belt.

2. Periodic Maintenance (Weekly / Monthly / Quarterly)

• Measure belt elongation and adjust tension accordingly. Steel cord belts have very low elongation, so obvious stretching indicates internal damage.

• Check the belt joint for looseness, rubber cracking, steel cord exposure or opening. The joint is the weakest part and must be in perfect condition.

• Inspect rubber cover thickness. If the cover is worn too thin, the steel cord may corrode or break.

• Check for corrosion of steel cords, especially in wet or acidic environments.

• Verify the condition of impact beds and skirt boards to prevent sharp objects from cutting the belt.

3. Common Damages and Repair Methods

(1) Minor surface rubber wear or small cracks

• Clean and dry the damaged area.

• Use cold vulcanizing rubber repair strips or repair compound to cover the defect.

• Polish and smooth the surface to restore integrity.

(2) Local rubber damage without steel cord exposure

• Remove damaged rubber.

• Apply rubber adhesive and attach repair rubber sheets.

• Use a pressure roller to compact and cure.

(3) Steel cord exposure or partial breakage

• Cut off the damaged section completely.

• Use a professional steel cord belt splicing kit to perform hot vulcanization or mechanical splicing.

• Ensure good adhesion between new rubber and steel cords to prevent delamination.

(4) Belt joint failure

• Disassemble the failed joint.

• Re-prepare the belt ends and re-splice by hot vulcanization (recommended for heavy‑duty conditions).

• Mechanical joints may be used for temporary emergency repair but are not suitable for long‑term heavy load.

(5) Belt edge damage

• Trim the damaged part neatly.

• Use edge repair rubber compound to rebuild and reinforce the edge.

• Adjust tracking to avoid repeated friction against the frame.

4. Safety Notes During Maintenance

• Stop the elevator completely and lock out the power source.

• Release belt tension before repair to avoid sudden movement.

• Use only rubber compounds and adhesives specially designed for steel cord conveyor belts.

• Do not use open fire near rubber materials.

• After repair, run the belt at low speed for commissioning before full-load operation.

5. When to Replace the Belt

• Steel cords are broken, loose or severely corroded.

• Belt elongation exceeds the allowable range.

• Joints cannot be effectively repaired.

• Rubber cover is severely worn, leading to frequent failure.

• The belt is deformed, causing persistent deviation or safety hazards.