1. Belt Misalignment (Most Frequent)

Symptoms: Belt runs off the roller center; edge wear, severe spillage, and even belt tearing.

Root causes:

• Misaligned idlers or pulleys;
• Off-center material loading (asymmetric load);
• Uneven belt tension;
• Material buildup on pulley surface;
• Frame distortion or foundation settlement.

Prevention & solutions:

• Installation accuracy: Idler lateral tilt ≤1.5mm; pulley axis perpendicularity ≤0.5mm/m.
• Training idlers: Install automatic belt trackers every 10 idler sets (both carry and return side). ZOOMRY recommends hydraulic/pneumatic aligners for fast response without belt damage.
• Load centering: Adjust chute outlet to drop material at belt center; add material centering device.
• Pulley cleaning: Use alloy rubber scrapers or polyurethane blades; add water spray or heater for sticky materials.
• Tension check: Measure tension difference between both sides; if >5%, re-adjust take-up.

2. Belt Slippage

Symptoms: Relative slip between drive pulley and belt, especially under heavy load; reduced throughput; rapid lagging wear.

Root causes:

• Insufficient belt tension (counterweight too light or screw take-up loose);
• Worn pulley lagging – low friction;
• Wet or dusty belt surface – reduced friction;
• Overload beyond design capacity.

Prevention & solutions:

• Tension adjustment: Regularly check take-up stroke; ensure tension at 90–110% of design. Use tension sensors for long conveyors.
• Lagging maintenance: Inspect lagging every 3 months; replace when wear depth >1/3. Ceramic lagging increases friction by >30%.
• Anti-slip measures: Apply slip-resistant spray on belt back; install slip detection switch to alarm and auto-tighten.
• ZOOMRY's recommendation: Use hydraulic auto-take-up that adjusts tension based on load, eliminating slippage. ZOOMRY offers this on selected export models with lagging wear sensors.

3. Belt Tear / Cut

Symptoms: Longitudinal/transverse scratches or cuts; severe tearing leads to long downtime.

Root causes:

• Foreign objects (iron, sharp stones, rebar) in material;
• Worn chute liner plates creating sharp edges;
• Buildup in chute scratching belt edge;
• Aging or poor splice quality.

Prevention & solutions:

• Magnetic separators: Install permanent/electromagnetic separators at head or transfer points; add metal detector with diverter.
• Chute liner maintenance: Check wear each week; replace when >2mm; ensure gap 3–5mm from belt; no sharp edges.
• Rip protection: Install rip detection sensors (pressure or inductive). Immediate stop when belt punctured.
• Splice inspection: Ultrasonic or X-ray inspection every six months; re-splice if voids found.
• ZOOMRY practice: Provide belt rip training and online monitoring system to visualize belt condition.

4. Severe Spillage / Material Leakage

Symptoms: Material spills from skirtboard sides, transfer points, or along the belt; pollution, waste, and idler jamming.

Root causes:

• Worn or aged skirtboard rubber seals;
• Off-center impact point – material splashes;
• Mismatch between belt speed and material feed speed;
• Poorly designed chute.

Prevention & solutions:

• Seal maintenance: Replace rubber seals every 3 months; ensure 5–10mm compression. Use double seals or dust extraction in dusty areas.
• Load centering: Use adjustable chute deflector plates to drop material at belt center and speed.
• Speed matching: For VFD drives, set acceleration/deceleration to match feed rate. Install impact idlers or impact bed at loading point.
• ZOOMRY's solution: Recommend curved chute (streamlined) to reduce impact and spillage, plus mist dust suppression.

5. Idler / Pulley Damage

Symptoms: Seized idler bearings, worn shell, corrosion; pulley shell wear, abnormal noise.

Root causes:

• Lack of lubrication or seal failure – dust/water ingress causing rust;
• Shell wear from material impact, accelerated by salt spray in ports;
• Bent idler bracket causing extra moment.

Prevention & solutions:

• Lubrication & seals: Monthly grease; use labyrinth or double-lip sealed idlers. ZOOMRY offers stainless steel or galvanized idlers for corrosion resistance.
• Pulley protection: Ceramic or rubber lagging; regular inspection. Use 316L stainless steel or epoxy coating for severe corrosion.
• Regular inspection: Feel idler temperature each shift (>60°C indicates bearing failure). Listen for pulley bearing noise.
• ZOOMRY's recommendation: Install idler condition monitoring system (vibration + temperature) for early warning.

6. Chute Blockage / Material Build-up

Symptoms: Material piles up at chute outlet, causing belt stall or back spill.

Root causes:

• High moisture or sticky material (e.g., clay, concentrate);
• Insufficient chute slope – low flow velocity;
• Mismatch between belt capacity and feed rate (instant overload);
• Hardened deposits on chute walls.

Prevention & solutions:

• Chute optimization: Design slope ≥60°; line with low-friction polymer liners.
• Level detection: Install rotary or radar level sensor; alarm at 80% and reduce feed.
• Regular cleaning: Clean chute each shift; use air cannons or vibrators to assist flow.
• ZOOMRY's recommendation: For sticky materials, use anti-clogging chute with timed air cannons or vibrating feeder.