Blow Moulding Machine Shakes or Makes Abnormal Noise

Stop if vibration is severe or increasing. Determine whether the source is high-pressure air, mould clamping, bearings, cams, stretch drives, cooling pumps or a loose structure, and diagnose only after stored energy is isolated.

Isolate high-pressure air, electrical power, heating circuits and motion energy before entering the guarded area. Treat hot oven components and pressurized blowing circuits as stored-energy hazards.

Locate the fault

• A knock occurs once per mould cycle
• Vibration increases with production speed
• Air piping pulses or whistles during blow
• Bearing temperature or servo load trends upward

Inspection sequence

1. Stop immediately for sharp impact, structural movement or increasing vibration
2. Record the exact cycle position, speed and cavity associated with the noise
3. Review servo load, motor current and bearing-temperature trends
4. Inspect guards, frame, mould mounts and accessible fasteners after lockout
5. Check high-pressure supply, valve exhaust and pipe supports
6. Use qualified vibration or alignment measurement to separate bearing, coupling and structural sources

Corrective work

• Replace worn joints, bearings and guides and tighten with the specified method
• Align mould and clamp and correct damaged locating surfaces
• Repair leaks, restrictions and pipe supports without defeating pressure protection
• Correct binding, coupling condition or approved motion parameters

Operating records and follow-up

• Keep baseline vibration and servo-load data
• Inspect mould mounts after changeover
• Maintain pressure valves and silencers
• Use torque-marked critical fasteners
• Investigate new noise before it becomes a secondary failure

Equipment details: 5 Gallon Bottle Blow Molding Machine.