CoverageChip meter / HP feeder / top separator / blow unit
ServiceHigh-temp, high-pressure alkaline cooking
Key clearancesMeter wheel 1.0 mm / scraper 45 mm
1 · Equipment Overview
| Function | Continuous cooking of chips with white liquor to remove lignin. |
| Flow | Chip metering → steaming → LP feeder → HP feeder → cooking → blow unit. |
| HP feeder | Rotor taper fit; 0.2 mm axial feed per pocket. |
| Meter-wheel clearance | Wheel end to housing 1.0 mm; scraper wall to wheel 45 mm. |
2 · Maintenance Process
Incoming checkAfter cleaning, measure meter-wheel end and scraper-wall gaps; record HP rotor axial position.
HP rotor adjustmentLift lock pin; feed rotor axially via hand wheel / motor — about twice weekly, 0.2 mm per pocket; calibrate against motor load / pump pressure.
Meter-wheel removalOpen inspection cover and drive-end cover; lift meter wheel with double-sling; remove both bearings.
Cleaning & inspectionClean wheel body with air / water; check wheel and scraper-wall wear and corrosion.
Taper repairBuild up worn HP-rotor taper; machine to restore taper and fit.
BearingsInspect / replace bearings; re-grease per lubrication chart.
Stuffing boxReplace packing; check drip tray and leakage.
Blow unitInspect cone / scraper wear — repair or replace; align bearings.
ReassemblyRe-lift meter wheel; fit covers and bearings; align gearbox coupling.
Trial runJog and ramp up; re-verify vibration, clearances and leakage; log adjustments.
3 · Key Process Photos
4 · Acceptance & Handover
Meter-wheel end gap ≤ 1.0 mm, scraper-wall gap ≈ 45 mm; HP-rotor taper fit and axial adjustment correct; stuffing box leak-free; bearing SPM values normal; screen plates / cones wear-repaired; trial-run records and adjustment log complete.