Injection Molding Machine Safety Operation and Maintenance Procedures

Injection Molding Machine Safety Operation and Maintenance

I. Pre-Startup Safety Requirements

1. Personnel entering the workplace must wear necessary protective equipment. Slippers are prohibited in the workshop.
2. Check whether the raw materials and accessories are qualified. Before feeding, check the raw materials for impurities and foreign objects.
3. Check whether the mold and its fixing bolts, travel switches, and control rods are loose or reliable. Check whether the tools are complete.
4. Check whether the guide rails and guide pillars of the equipment and mold are clean. Wipe with clean cotton yarn and lubricate all lubrication points.
5. When starting up after a shutdown or on the first shift after a holiday, use a test pen to check whether the equipment is leaking electricity. Check whether the cooling water system is blocked or leaking.
6. When the barrel is heating up, turn on the barrel cooling water at the same time. In cold winter conditions, first jog the oil pump, and after confirming no abnormal phenomena, run it empty for 10-15 minutes before normal production.

II. Safety Requirements During Production

1. After the barrel temperature reaches the process requirements, maintain the temperature for 30-60 minutes before starting the machine.
2. The safety door must be used during operation. If the safety door travel switch fails, the machine must not be started. Operating without the safety door is strictly prohibited.
3. Non-shift operators are not allowed to press any handles or buttons without permission.
4. When placing molds or inserts, be steady and reliable. If abnormalities are found during mold closing, stop the machine immediately and report to the shift leader.
5. When repairing the machine or cleaning the mold for an extended period, the power must be disconnected. When cleaning residual material or products from the mold, use soft metal materials such as copper.
6. All covers, protective guards, and protective covers for electrical, hydraulic, and rotating parts must be properly installed and securely fastened.
7. For air injection, generally no more than 5g each time. When two consecutive injections fail, notify nearby personnel to stay away from the danger zone.

III. Key Maintenance Practices

Hydraulic System

• Keep hydraulic oil temperature between 30-50 degrees Celsius to prevent oil oxidation.
• Monitor oil viscosity regularly to prevent pump damage and leakage.
• Check the oil cooler for water leaks to prevent water from entering the oil cylinder.
• Replace hydraulic oil and clean the oil screen every 3,000-4,000 hours of operation.

Clamping Unit

• Lubricate hinge components properly for long-term use.
• Keep tie bars clean and lubricate sliding feet and guide rails.
• Operate at appropriate clamping pressure to avoid insufficient or excessive force.

Injection Unit

• Keep guide shafts lubricated and maintain injection table surface clean and dry.
• Only use approved plastics, pigments, and additives in the hopper.
• Do not start the melting motor before the barrel reaches preset temperature.
• Regularly inspect all parts and tighten any loose components.

Electrical System

• Do not turn on power unnecessarily when inspecting high-voltage parts.
• Prevent water ingress into the control cabinet when changing molds.
• Monitor control cabinet temperature to prevent electronic board damage.
• Replace old relays with new ones specified by the manufacturer.