In daily injection molding production, injection molding robots are widely used for part removal, handling, and product placement. They play an important role not only in production efficiency, but also in on-site safety. In particular, during maintenance, machine adjustment, mold change, and test-run stages, equipment is no longer in normal operating condition, which means the risk of unexpected movement, collision, or pinching is often higher than during standard production.

For this reason, injection molding robot maintenance should not focus only on whether the equipment can be repaired, but also on whether it can be repaired safely. If safety procedures are ignored during maintenance, even a minor fault can quickly become a serious incident involving personnel injury, equipment damage, or production loss.

Why Is Injection Molding Robot Maintenance More Likely to Create Safety Risks?

When a robot fails, many factories focus on restoring production as quickly as possible. However, in many cases, the real danger does not come from the fault itself, but from unsafe maintenance behavior. Examples include checking the machine before the power is fully isolated, disassembling components while residual air pressure is still present, or allowing personnel to remain within the robot arm’s operating range during mold changes or adjustment.

Because injection molding robots often work together with injection molding machines, molds, air circuits, vacuum systems, and control systems, any mistake in the maintenance process may trigger sudden movement or abnormal operation. This is why maintenance safety must be treated as a standard management issue rather than a temporary on-site judgment.

7 Key Safety Measures to Avoid Danger During Injection Molding Robot Maintenance

1. Always Shut Off the Power Before Inspection

Before performing any maintenance on an injection molding robot, the first step is to turn off the power and confirm that the robot, the injection molding machine, and the related control system have all stopped operating. It is not enough to stop the machine from the operator panel only. The main power supply must be isolated to prevent standby circuits, servo systems, or linked equipment from remaining active.

2. Release Residual Pressure Before Maintenance

In addition to power isolation, maintenance personnel should release any remaining air pressure, vacuum pressure, or other stored energy inside the injection molding robot. In many robots, the pneumatic system may still contain residual pressure after shutdown. If a solenoid valve is triggered unexpectedly or the circuit releases suddenly, the robot arm may move without warning. That is why power-off and pressure release must always be carried out together.

3. Do Not Disassemble or Modify Non-Standard Faults Without Professional Support

Common issues such as proximity switch failure, unstable suction, or solenoid valve malfunction may be handled by trained maintenance staff following standard procedures. However, problems related to programming, servo drives, wiring, origin position deviation, or control logic should only be handled by qualified technicians. Unauthorized disassembly or modification can increase the scope of the fault and may lead to mis-grabbing, incorrect positioning, or mold collision after restart.

4. Do Not Replace Original Parts Arbitrarily

To reduce downtime, some factories temporarily install parts that look similar to the original components. However, injection molding robots require precise coordination in positioning accuracy, cycle timing, and control compatibility. Replacing original parts with unsuitable alternatives, or changing parameters and wiring without approval, may result in unstable robot operation and long-term safety risks. Proper spare parts management is always more reliable than temporary substitution.

5. Stay Clear of the Robot’s Motion Path During Mold Change and Adjustment

Injection molding robot maintenance is often carried out together with mold changing, position correction, or motion adjustment. This stage is one of the highest-risk moments for collisions and pinch injuries. Operators should ensure the robot is in maintenance mode or safety mode before any adjustment begins, and all personnel must stay out of the robot arm’s movement range. During mold adjustment in particular, no one should stand between the robot and the mold area.

6. Clear the Area Before Test Running

After maintenance is completed, the machine should not be test-run immediately with personnel standing nearby. The correct procedure is to confirm that all tools have been removed, safety covers are back in place, screws and air fittings are secured, and all personnel have left the hazardous area. Only then should the robot go through manual testing, dry-run verification, and linked operation testing. Automatic operation should resume only after the motion path, speed, and pickup position have all been confirmed as normal.

7. Never Perform Maintenance with Live Power or Connected Air Pressure

In order to save time, some operators troubleshoot while the machine is still powered on, test while the air supply is connected, or restart automatic motion before safety conditions have been fully checked. This is one of the most dangerous practices in injection molding robot maintenance. Skipping safety steps may appear efficient in the short term, but it significantly increases the risk of injury, equipment damage, and repeated machine stoppages.

How Can Injection Molding Factories Reduce Maintenance Risk?

For injection molding factories, reducing the risk of injection molding robot maintenance should not depend solely on the experience of an individual technician. It should be based on a structured safety management system. Factories are advised to establish standard maintenance procedures that include power-off confirmation, pressure release confirmation, maintenance authority classification, pre-test area clearance, and maintenance record management.

In addition, regular training on common injection molding robot faults can help reduce operator mistakes and repeated downtime. From a workshop management perspective, injection molding robot maintenance is not only an equipment servicing task, but also a critical part of factory safety management.

Conclusion

To avoid danger during injection molding robot maintenance, the key is not how many steps are involved, but whether every step is followed properly. From power isolation and pressure release to mold change, fault diagnosis, spare parts replacement, and test-run procedures, each part of the process should follow a clear and standardized safety workflow.

For injection molding factories, paying attention to injection molding robot maintenance safety is not only about preventing accidents. It is also essential for maintaining stable equipment performance, continuous production, and standardized workshop management.

FAQ Section

Why must the power be turned off before injection molding robot maintenance?

Because the robot, injection molding machine, and control system may still be linked together. Even if the machine appears stopped, internal electrical systems or standby functions may still be active. Power isolation is the most basic step to prevent unintended startup.

Is it enough to turn off the power without releasing pressure?

No. Many injection molding robots use pneumatic systems, and residual air pressure may still remain inside the machine after shutdown. If pressure is not released, the robot arm may move suddenly and create a serious safety hazard.

Can operators repair an injection molding robot by themselves after a fault occurs?

Simple and routine faults may be handled by trained personnel. However, issues involving programs, servo systems, electrical wiring, or core mechanical components should be handled by professional technicians only. Unauthorized repair may worsen the fault and increase safety risks.