1. Daily Maintenance: Preventive Checks Before and After Operation
Daily maintenance focuses on "pre-operation inspection" and "post-operation cleaning" to eliminate potential risks before they escalate.
Pre-Operation Inspection (5–10 Minutes)
Mixing Drum: Check for cracks, deformation, or loose welds on the drum body. Ensure the drum rotates smoothly without abnormal noises (e.g., squeaking or clanging) that may indicate bearing wear.
Mixing Blades & Liners:
Inspect the wear condition of blades and liners-if the blade edge is worn to less than 1/3 of its original thickness, or if liners show obvious concave marks, replace them immediately.
Tighten the fixing bolts of blades and liners (use a torque wrench to ensure consistent tightness, as loose parts can cause uneven mixing or drum damage).
Drive System: Check the tension of the drive belt or chain. If there is slack (evidenced by excessive vibration during startup), adjust the tensioning device promptly.
Lubrication Points: Verify that lubricating oil/grease levels at key points (e.g., drum bearings, reducer) meet the specified standard (refer to the equipment manual for oil level marks).
Post-Operation Cleaning (Must Be Completed)
Asphalt residue hardens easily and can cause blockages or uneven mixing if left untreated.
High-Pressure Water Cleaning: Use high-pressure water (pressure ≥ 15 MPa) to flush the inner wall of the mixing drum, blades, and discharge port. Focus on areas where asphalt tends to accumulate (e.g., blade roots, drum corners).
Residue Scraping: For stubborn, hardened residue, use a non-metallic scraper (to avoid scratching the drum liner) to remove it manually. Do not use a hammer or other hard tools, as this may damage the liner.
Drainage: Ensure all water in the cleaning system is drained after cleaning, especially in low-temperature environments, to prevent pipeline freezing and cracking.
2. Quarterly/Annual Maintenance: Overhaul and Replacement
Annual maintenance is a comprehensive overhaul to ensure long-term stable operation of the mixing device.
Bearing Replacement: Disassemble and inspect the drum bearings. If there is rust, pitting, or excessive clearance (measured with a feeler gauge), replace them with new bearings of the same model (use original parts to ensure compatibility).
Reducer Overhaul: Drain the old lubricating oil in the reducer, clean the oil tank and filter, and refill with new oil that meets the manufacturer's specifications (e.g., 220# industrial gear oil). Replace the oil seal if leaks are found.
Structural Inspection: Check the overall frame of the mixing device for deformation. Tighten all high-strength bolts (e.g., drum support bolts) using a torque wrench according to the specified torque value.
Performance Test: After overhaul, conduct a no-load test (run the drum for 30 minutes) and a load test (mix a small batch of asphalt mixture) to verify that the mixing speed, uniformity, and discharge efficiency meet the standard requirements.
3. Special Maintenance: Adapt to Working Conditions
High-Temperature Environments (≥ 35°C): Increase the frequency of lubrication (e.g., from weekly to 3 days) and check the reducer temperature twice a day. Install a heat shield for the motor if necessary to prevent overheating.
Low-Temperature Environments (≤ 0°C): Use low-temperature lubricating oil (e.g., -15°C grade) for bearings and reducers. Preheat the mixing drum for 10–15 minutes before operation to avoid cold startup damage.
Dusty Environments: Install a dust cover for the drive chain/belt and clean the air filter of the motor weekly to prevent dust from entering and causing component wear.