The stable operation of guide-column blow molding machines directly impacts the forming quality and production efficiency of hollow products. Scientific and systematic maintenance not only extends equipment lifespan but also significantly reduces failure downtime. The core lies in establishing a three-pronged maintenance system: “daily inspections + periodic maintenance + specialized maintenance for critical components,” with a focus on ensuring guide-column precision, hydraulic system stability, and mold compatibility.

I. Daily Maintenance (Per Shift)

Conducting basic inspections and cleaning before and after daily operation serves as the first line of defense against unexpected failures:

Lubricate Critical Moving Components

Before startup: Apply specified lubricants (oil or grease) to guide columns, mold opening/closing rails, robotic arm slides, etc., ensuring smooth operation.
After shutdown: Re-lubricate and clean residual oil to prevent dust-lubricant mixtures from forming abrasive particles.

Equipment Cleaning and Condition Check

Clean oil stains, plastic debris, and cooling water scale from machine surfaces;
Inspect heating elements for looseness and power cables for damage;
Verify safety door interlock functionality and emergency stop button responsiveness.

Auxiliary System Operation Verification

Check compressed air pressure within 0.6–0.8MPa range;
Drain accumulated water from air compressor triplets to prevent moisture ingress into pneumatic components;
Ensure cooling water lines are unobstructed and mold cooling channels are free of blockages.
II. Periodic Maintenance Schedule

Implement tiered maintenance strategies based on operating hours or production cycles for precise protection:

Table
Cycle    Maintenance Item    Technical Requirements
Weekly    Hydraulic oil filtration, guide rail parallelism inspection    Oil cleanliness meets NAS 8 standard; guide rail deviation ≤0.02mm/m
Monthly    Replace hydraulic oil filter element, inspect belt tension    Clean cooling water tank, calibrate temperature sensors
Quarterly    Discharge head disassembly/cleaning, air compressor maintenance    Channel surface roughness Ra ≤ 0.8μm; clean filters
Semi-annually    Gearbox oil change, circulating water system cleaning    Use N320 gear oil; remove rust and sediment
Annually    Electrical system insulation testing, comprehensive mold inspection    Insulation resistance ≥1MΩ; inspect guide pin heat treatment hardness

Special Note: Replace hydraulic oil for the first time after three months of new equipment operation to prevent initial wear contaminants from affecting system lifespan.

III. Special Maintenance Points for Guide Pins and Molds

As core guiding structures, guide pins require meticulous maintenance:

Guide Pin Lubrication and Protection

Regularly apply high-temperature grease to prevent dry friction;
Inspect guide pin surfaces for scratches, bending, or corrosion; replace immediately if damaged;
Recommend adding cylindrical locating keys at parting lines to distribute lateral forces and extend guide pin lifespan.

Mold Maintenance Standards

Inspect cavity surfaces before each use; repair minor scratches with 300-grit sandpaper;
Store molds closed with guide pins coated in rust-preventive oil and cavities sprayed with rust inhibitor;
For PET molds, perform nitriding treatment after every 50,000 shots to ensure surface hardness ≥ HV800.

Avoid Human-Caused Damage Risks

After mold replacement, recalibrate the position of limit switches and clamping cylinders;
When clearing fallen hot molded blanks, shut off air and power sources to prevent accidental operation injuries.