Complete Daily Maintenance Plan for Automated Storage and Retrieval System Stacker Crane

I. Daily Pre-Start Inspection (Performed by the operator 10 minutes before shift)

1. Mechanical Structure Visual Inspection

1. Tracks: Tracks are free of debris, welding slag, and oil stains; pressure plate bolts are not loose; tracks are free of deformation and cracks; limit stops are intact.

2. Loading Platform & Forks: Forks extend and retract smoothly, without deformation, wear, or cracks; upper and lower limit stops and buffer rubber are intact; rollers are free of jamming and abnormal noises.

3. Columns & Lifting Chains/Wire Ropes: Chains are free of looseness, broken strands, and rust; lubrication is sufficient; wire ropes are free of fraying and indentations.

4. Traveling Wheels: Wheel surfaces are free of severe wear, delamination, and cracks; operation is free of deviation and abnormal noises.

2. Mandatory Inspection of Safety Components

1. Emergency Stop Button: Pressing the emergency stop button on the control cabinet, at the head, or at the tail of the stacker crane will immediately stop the machine; reset is normal.

2. Photoelectric Safety Protection: Safety photoelectric sensors at both ends of the aisle and anti-fall photoelectric sensors on the loading platform are free from dust obstruction, and triggering shutdown functions effectively.

3. Buffers and Travel Limits: Ascending/descending and left/right travel limit switches operate sensitively.

3. Electrical and Air Supply Inspection

1. Control Cabinet: Fan operates normally; no dust accumulation, odor, or signs of overheating or burning inside; indicator lights have no abnormal alarms.

2. Cables: Cables inside the cable chain are free from compression, damage, or pulling; joints are secure.

3. Air Supply (for models with pneumatic forks): Air pressure is stable at 0.5~0.7MPa; air pipes are free from leaks and water accumulation.

4. 3-Minute No-Load Test Run

Perform low-speed travel, lifting, and full fork extension/retraction; observe for any abnormal noises, vibrations, or jamming; the screen displays no fault codes.

II. Daily Post-Stop Maintenance (15 minutes after shift)

1. Dust Removal: Blow dust from tracks, columns, control cabinet vents, and sensor lenses.

2. Debris Removal: Clean fallen cardboard boxes, plastic, and cargo debris from the aisles to prevent jamming of the forks and wheels.

3. Record Keeping: Register abnormal noises, errors, limit switch malfunctions, oil leaks, etc. Report any abnormalities immediately; do not operate the machine while it is malfunctioning.

4. Power Disconnection: For long-term shutdowns, disconnect the main power supply to the stacker crane and shut off the air supply.

III. Weekly Regular Maintenance (Equipment Maintenance Personnel)

1. Lubrication Maintenance

• Travel wheel bearings, lifting guide wheels, fork rollers: Apply high-temperature grease;

• Lifting chain, travel drive chain: Clean old oil stains and apply chain-specific lubricant;

• Linear guide slider: Wipe clean and apply evenly with oil.

2. Tightening Inspection: Tighten all track bolts, column connection bolts, loading platform fasteners, and motor base bolts one by one.

3. Sensor Calibration: Clean the laser rangefinder, positioning encoder, and cargo detection photoelectric sensor; verify the cargo positioning accuracy (standard ±1~2mm), and make timely fine adjustments for any deviations.

4. Motor Inspection: Travel/Lifting/Forklift Motors: Operating temperature ≤70℃, bearings without abnormal noise, cooling fans in good working order.

5. Full Testing of Safety Functions: Manually trigger limit switches, safety photoelectric sensors, and emergency stop; confirm the reliability of interlock protection.

IV. Monthly In-Depth Maintenance

1. Disassembly and Inspection of Transmission Components

• Reducer: Check the lubricating oil level; check for emulsification and leaks; add oil if insufficient, replace if deteriorated;

• Gears and Synchronous Belts: Synchronous belts should be free of cracks and wear; tension adjusted to the standard range.

2. **Wire Rope/Chain Depth Inspection:** Check for chain elongation and pin wear; replace the wire rope immediately if the number of broken wires exceeds the standard.

3. **Electrical System Deep Dust Removal:** Open the control cabinet and use compressed air to purge contactors, relays, PLC modules, and terminal blocks; tighten any loose wiring terminals.

4. **Overall Machine Accuracy Verification:** Perform 5 cycles each under no-load and heavy-load conditions to check for positioning deviations when storing and retrieving goods; adjust the guide wheel clearance and laser positioning parameters.

5. **Pneumatic System Maintenance:** Drain the air tank and remove water from the pipelines; clean the pressure regulating filter element.

V. Quarterly/Annual Overhaul and Maintenance

1. Disassemble all bearings and replace the grease; replace worn bearings directly.

2. Replace severely worn chains and wire ropes entirely.

3. Replace all reducer lubricating oil.

4. Calibrate the encoder and laser rangefinder; replace aging sensors.

5. Perform structural flaw detection on the entire machine: check for fatigue cracks in the welds of the columns and loading platform.

6. Backup the control system program; check for aging wiring; replace cracked cables.

7. Conduct third-party testing of the safety system and issue a safety inspection report.

VI. Key Points for Daily Prevention of Common Faults

1. Positioning Misalignment: Regularly clean the tracks, calibrate the laser, and replace worn wheels promptly.

2. Fork Jamming: Clean debris from the forks daily and lubricate the rollers weekly.

3. Communication Errors: Regularly tighten cable connectors to prevent long-term bending and damage.

4. Overload Alarm: Strictly prohibit loading or unloading goods beyond the rated weight; regularly calibrate the load detection sensor.

5. Abnormal Noise and Vibration: Focus on checking for insufficient chain lubrication, loose bolts, and debris on the tracks.

VII. Maintenance Safety Standards

1. Maintenance within the aisle must be tagged and locked, the main power supply disconnected, and supervised by designated personnel.

2. When performing maintenance at heights (high-altitude stacker cranes), wear a safety belt; personnel are prohibited from carrying people on the loading platform.

3. Lubrication and dust removal operations should be avoided during automatic operation periods.

4. Do not put the equipment into production operation before the fault is repaired.