1. Insufficient Initial Tension
Cause:
Initial belt tension is too low.
Take-up device does not provide sufficient pulling force.
Take-up carriage is stuck or obstructed.
Tension at the belt separation point from the drive pulley is insufficient.
This situation commonly occurs during startup.
Solution:
Adjust the take-up system to increase tension.
Remove any obstruction affecting the take-up carriage.
Increase counterweight to improve initial belt tension.
Proper tension ensures adequate friction between the belt and drive pulley.
2. Insufficient Friction Between Drive Pulley and Belt
Cause:
Water on the belt surface.
High humidity environment.
Reduced friction coefficient between belt and drive pulley.
When friction is insufficient, the drive pulley rotates but fails to transmit motion effectively to the belt.
Solution:
Keep the belt surface dry and clean.
Improve environmental moisture control if possible.
Apply friction-enhancing material (such as rosin powder) to the pulley surface.
Safety Note:
Rosin powder must not be applied manually. It should be blown in using appropriate air equipment to avoid personal injury.
3. Bearing Damage Increasing System Resistance
Cause:
Tail pulley bearing failure (pulley does not rotate).
Multiple upper or lower idler roller bearings damaged and not rotating.
Excessive mechanical resistance increases load, which can lead to slippage.
Solution:
Inspect and replace damaged bearings.
Ensure all pulleys and rollers rotate smoothly.
Implement regular preventive maintenance.
4. Excessive Load or Improper Startup
Cause:
Material load exceeds motor capacity.
Startup speed is too fast.
Belt acceleration is too aggressive.
When load exceeds transmission capability, slippage occurs.
Solution:
Reduce material feed immediately when slippage is detected.
Stop the conveyor immediately if the belt fails to rotate.
Restart under reduced load conditions.
Verify motor capacity matches operating requirements.
5. Severe Belt Misalignment (Tracking Problem)
Cause:
Belt deviation causes friction against frame or safety guards.
Increased side resistance leads to slippage.
Solution:
Adjust tracking system immediately.
Align rollers and pulleys.
Ensure frame structure is level and square.
Conclusion
Conveyor belt slippage is typically caused by:
Low tension
Insufficient friction
Mechanical resistance
Overloading
Severe misalignment
Timely inspection and corrective action can prevent equipment damage, production downtime, and safety hazards. Regular maintenance, proper tension control, and load management are essential for stable conveyor system operation.
