plastic injection molders motor are critical to efficient manufacturing processes. However, unexpected stoppages can occur due to various reasons. Here’s a detailed guide on the causes and solutions for such issues, along with an analysis of the hazards of excessive temperature rise in injection machines.
Solutions for Sudden Stops of plastic injection molders Motor
- Loose Wiring Issues
- Cause: Loose wires can cause overheating and trigger the motor’s thermal overload protection.
- Solution: Inspect the wiring and ensure all connections are secure. Once resolved, reset the switch to restart the motor.
- Thermal Overload Trip
- Cause: If the wiring is intact, the thermal overload under the contactor may have been triggered due to excessive load.
- Solution: Adjust the thermal overload setting by increasing it to the maximum. This should resolve the issue.
Reasons and Solutions for Oil Pump Motor Failure in Injection Molding Machines
- Motor Emits an Abnormal Sound Without Rotating
- Cause: A blown or loose fuse, or issues with the motor’s three-phase power supply.
- Solution: Immediately engage the emergency stop button. Inspect the fuse and check the three-phase power supply for irregularities.
- No Sound When Pressing the Start Button
- Cause: Possible issues include a faulty start button, loose wiring on the AC contactor, or activation of the thermal relay.
- Solution: Inspect the button switch and all wiring connections.
- Oil Pump Stuck, Motor Fails to Rotate
- Cause: Mechanical blockage in the oil pump.
- Solution: Inspect and repair the oil pump to resolve the issue.
- Burned-Out Motor
- Cause: Potential reasons include phase failure, overload, poor relay contacts, or unstable voltage in the three-phase power supply.
- Solution: Replace or repair the motor to its original specifications, addressing the underlying causes.
Five Major Hazards of Excessive Temperature in Injection Molding Machines
Excessive temperature in plastic injection molders can severely affect their performance and lifespan. Here’s a breakdown of the hazards and their implications:
- Thermal Deformation of Machinery
- Impact: Uneven expansion of components leads to movement failure, reduced transmission accuracy, and poor performance of hydraulic components.
- Reduction in Oil Viscosity
- Impact: Lower viscosity increases leakage, decreases system efficiency, and accelerates wear and tear of sliding parts.
- Rubber Seal Deformation
- Impact: Heat causes seals to deform, age prematurely, and lose effectiveness, leading to leaks and reduced service life.
- Accelerated Oxidation and Oil Deterioration
- Impact: High temperatures accelerate oil oxidation, clogging valve ports and reducing hydraulic efficiency.
- Degraded Component Quality
- Impact: High temperatures cause dissolved air to escape, leading to air pockets that reduce hydraulic system performance.
Ideal Operating Temperature for Hydraulic Systems
To ensure optimal performance, the hydraulic system’s temperature should range between 45°C and 50°C. Temperatures outside this range can negatively impact component accuracy, system response sensitivity, and seal longevity.
Tips to Prevent Excessive Oil Temperature
- Adjust Relief Valve Pressure
- Regularly check and adjust the valve pressure based on load requirements to maintain optimal settings.
- Select Appropriate Hydraulic Oil
- Choose oil with the correct viscosity for your system to minimize friction and heat.
- Enhance Lubrication
- Ensure moving parts are well-lubricated to reduce friction and workload.
- Improve Assembly Quality
- Focus on precision assembly, tighter clearances, and high-quality sealing materials to reduce friction-related heat.
- Add Cooling Devices
- If necessary, install cooling systems to keep temperatures within the recommended range.
Summary
Maintaining proper wiring, addressing overloads promptly, and monitoring oil temperatures are essential for the reliable operation of plastic injection molders. By understanding these common motor and hydraulic system issues, you can avoid downtime and extend the life of your machinery.
Stay vigilant, optimize performance, and ensure consistent production quality by keeping these key tips in mind.
