Daily Maintenance Checklist and Schedule Recommendations for Rice Hullers

Maintenance: The Guarantee of Efficient Equipment Operation

As a key piece of equipment in rice processing lines, the rice huller's operating condition directly affects production efficiency and product quality. Many equipment failures and performance declines are not due to equipment quality issues but inadequate daily maintenance. Establishing a scientific and standardized maintenance system can not only extend equipment lifespan but also maintain stable processing quality and reduce repair costs.

Hierarchical Maintenance Management

Based on maintenance content and cycle, rice huller maintenance can be divided into four levels:

| Level | Cycle | Main Content | Personnel | |-------|-------|-------------|-----------| | Level 1 | Per shift/daily | Cleaning, inspection, lubrication | Operator | | Level 2 | Weekly | Tightening, adjustment, partial disassembly | Operator/Maintenance | | Level 3 | Monthly | Comprehensive inspection, measurement, part replacement | Maintenance | | Level 4 | Quarterly/annual | Major overhaul, precision restoration, upgrades | Professional technicians |

Level 1 Maintenance: Per Shift/Daily

Execution Time: After each shift or before daily startup (approximately 15-20 minutes)

Personnel: Equipment operator

Cleaning Tasks

• [ ] Clean feed hopper: Remove residual paddy and impurities
• [ ] Clean discharge outlet: Remove accumulated brown rice and broken rice
• [ ] Clean roll surfaces: Use soft brush to remove adhered bran powder and impurities
• [ ] Clean air passages: Remove accumulated husks and dust from ducts
• [ ] Clean equipment surface: Wipe dust and oil from machine body
• [ ] Clean work area: Sweep scattered paddy and bran from floor

Inspection Tasks

• [ ] Check feeding smoothness: Confirm no bridging or blockage in hopper
• [ ] Check roll surfaces: Visual inspection for foreign objects or damage
• [ ] Check drive belts: Observe for slippage, cracks, or looseness
• [ ] Check operation sounds: Listen for abnormal noises after startup
• [ ] Check motor temperature: Touch motor housing to confirm not hot (< 60°C)
• [ ] Check bearing temperature: Touch bearing housing for normal temperature rise (< 50°C)
• [ ] Check ammeter: Confirm current is within rated range
• [ ] Check pneumatic system (pneumatic type): Check air pressure stability and pipe leaks

Lubrication Tasks

• [ ] Replenish grease: Add appropriate amount of grease to required lubrication points
• [ ] Check oil level (gearbox): Confirm oil level is within gauge range
• [ ] Check oil condition: Observe lubricating oil color; replace if significantly darkened

Level 2 Maintenance: Weekly

Execution Time: Fixed day each week (approximately 1-2 hours)

Personnel: Operator cooperating with maintenance worker

Tightening Tasks

• [ ] Tighten foundation bolts: Check and tighten all foundation bolts
• [ ] Tighten bearing housing bolts: Prevent loosening causing roll shaft offset
• [ ] Tighten motor base bolts: Prevent motor displacement causing belt slippage
• [ ] Tighten protective covers: Ensure all covers are securely fixed
• [ ] Tighten electrical connections: Check if terminals in control cabinet are loose

Adjustment Tasks

• [ ] Adjust belt tension: Press middle of belt; 10-15mm depression is appropriate
• [ ] Check roll gap: Measure with feeler gauge, confirm within set range
• [ ] Adjust feed baffles: Ensure even feed distribution
• [ ] Check pneumatic setting (pneumatic type): Confirm pressure value meets process requirements

Disassembly Inspection Tasks

• [ ] Disassemble feed device: Clean accumulated material and impurities from feeder
• [ ] Check roll wear: Measure roll diameter, assess wear degree
• [ ] Check bearing condition: Remove bearing covers, inspect lubrication and wear
• [ ] Clean fan impeller: Remove dust accumulation from blades

Level 3 Maintenance: Monthly

Execution Time: Fixed day each month (approximately 4-8 hours)

Personnel: Maintenance worker

Comprehensive Inspection

• [ ] Measure roll gap: Measure at multiple points, check gap uniformity
• [ ] Measure roll diameter: Record wear amount, predict replacement time
• [ ] Check gear meshing: Open gearbox, inspect tooth surface wear
• [ ] Check bearing clearance: Measure radial bearing clearance, judge if exceeded
• [ ] Check motor insulation: Measure motor winding insulation resistance with megohmmeter
• [ ] Check electrical control system: Inspect contactors, relays, buttons, and other components

Wear Part Replacement

• [ ] Replace grease: Completely replace bearing grease
• [ ] Replace gearbox oil: Drain old oil, clean tank, add new oil
• [ ] Replace belts: Replace promptly if belts are severely worn or aged
• [ ] Replace filters: Replace air compressor filters (pneumatic type)

Precision Restoration

• [ ] Calibrate roll shaft parallelism: Ensure two roll axes are parallel
• [ ] Calibrate pulley alignment: Ensure driving and driven pulley end faces align
• [ ] Calibrate equipment level: Check and adjust equipment level with spirit level

Level 4 Maintenance: Quarterly/Annual

Execution Time: Arranged once per quarter or year (1-3 days)

Personnel: Professional maintenance personnel or factory technicians

Major Overhaul Content

• [ ] Comprehensive disassembly inspection: Disassemble entire machine, inspect all components
• [ ] Replace core components: Replace bearings, gears, etc. based on wear condition
• [ ] Repair or replace rolls: Grind or replace with new rolls
• [ ] Repair frame: Straighten deformation, weld cracks
• [ ] Repaint: Remove rust and recoat

Technical Upgrades

• [ ] Upgrade control system: Such as adding frequency converters, PLCs, etc.
• [ ] Optimize air network system: Modify air ducts to improve separation efficiency
• [ ] Noise reduction treatment: Add sound insulation measures to improve working environment

Maintenance Record Form

Establish maintenance records, documenting each maintenance's content and discovered problems:

| Date | Maintenance Level | Personnel | Maintenance Content | Problems Found | Corrective Actions | |------|------------------|-----------|--------------------|----------------|--------------------| | | | | | | |

Common Maintenance Misconceptions

Misconception 1: Heavy Use, Light Maintenance

Manifestation: Equipment runs non-stop without regular maintenance. Consequences: Accelerated wear, frequent failures, shortened lifespan. Correct Approach: Strictly execute maintenance according to schedule.

Misconception 2: Never Changing Lubricating Oil

Manifestation: Gearbox oil unchanged for years; bearing grease only added, never replaced. Consequences: Oil deterioration, poor lubrication, accelerated wear. Correct Approach: Replace lubricating oil and grease according to schedule.

Misconception 3: Replacing Rolls Only at Limit

Manifestation: Rolls used until completely unusable before replacement. Consequences: Long-term low hulling rate, high broken rice rate, increased energy consumption. Correct Approach: Establish roll usage records; replace when recommended processing volume is reached.

Misconception 4: Ignoring Small Problems

Manifestation: Discovering abnormal sounds or vibrations but not addressing them. Consequences: Small problems escalate into major failures, repair costs multiply. Correct Approach: Stop immediately for inspection upon discovering abnormalities; address promptly.

Zhejiang Lianggong's Maintenance Services

Zhejiang Lianggong Machinery provides comprehensive maintenance support for customers:

• Maintenance Training: Systematic maintenance training for customer operators
• Maintenance Manual: Detailed maintenance manual provided with each machine
• Regular Follow-ups: After-sales engineers regularly visit to guide maintenance
• Parts Supply: Common parts kept in stock to ensure timely availability
• Overhaul Services: On-site overhaul and refurbishment services

For more maintenance knowledge, please call 0575-87335525.