Weigh Feeder (Belt Gravimetric Feeder) — Maintenance & Calibration

1. Preventive Maintenance Schedule

Weekly

1. Clean weigh deck, belt, idlers, skirtboards; remove material buildup, caking, spillage. Buildup causes zero drift.

2. Inspect belt tracking, tension, cracks, wear. Check belt for material sticking.

3. Check idlers on weigh span: must rotate freely, no binding. Binding creates side force on load cells.

4. Check speed sensor: pulse signal stable, no loose wiring.

5. Check load cell cable, junction box: tight terminals, no moisture or corrosion.

6. Observe flow trend: large fluctuation = investigate immediately.

Monthly

1. Lubricate reducer, head/tail roller bearings (follow grease spec).

2. Check weighbridge alignment, mounting bolts, anti-vibration mounts, stop clearance.

3. Perform Zero calibration (empty belt).

4. Check hopper gate, seal, material bridging.

Quarterly

1. Span calibration (test weight / chain weight).

2. Gravimetric material catch test (dynamic real-material verification, most important for accuracy).

3. Inspect load cell for overload damage, physical contact or binding.

4. Backup controller parameters, save zero/span records.

Annual

1. Full mechanical inspection, belt replacement if worn.

2. Complete calibration + official certificate if required.

3. Check grounding & shielding for electrical noise.