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How should a plastic extruder be run under no-load conditions for testing and inspection?

Time：

2018-10-20

How should a plastic extruder be subjected to an no‑load trial run and inspection? After installation, the plastic extruder must undergo a no‑load trial run to avoid wasting material, while also verifying that all operating parameters are functioning properly, enabling prompt identification of any issues and their root causes. I. No‑load trial run and inspection of the barrel heating sections: 1. Heat each section of the extruder barrel to the required process temperature, adjusting the temperature control instruments accordingly. 2. Use mercury thermometers to measure the temperature in each section, cross‑checking and calibrating the instrument readings against the thermometer readings. 3. Verify that the heating system includes proper circuit‑breakage alarms and that it operates correctly.

How should a plastic extruder be tested under no-load conditions? After installation, the plastic extruder must undergo a no‑load trial run to avoid wasting material and to verify that all operating parameters are functioning properly, enabling prompt identification of any issues and their root causes.

1. Conduct a no-load trial run to check the heating and temperature rise of each section of the plastic extruder barrel.

1. Heat and raise the temperature of each section of the plastic extruder barrel, and adjust the temperature control instruments according to the process temperature requirements.

2. Use a mercury thermometer to measure the temperature at each section of the barrel, and verify and adjust the instrument‑displayed temperature to match the reading from the mercury thermometer.

3. Verify that the heating device includes a heating circuit open-circuit alarm and that it functions properly.

4. After the barrel is heated to the process temperature, maintain constant‑temperature heating for 1 hour and record the heating time.

5. Retighten the bolts connecting the barrel to the barrel support.

6. Start the screw‑driving motor at low speed, and observe whether the voltmeter and ammeter readings fluctuate abnormally; check that the screw rotates smoothly, and listen for any unusual operating noises from the transmission components. If all conditions are normal, stop the machine. Note: The no‑load running time of the screw should not exceed 3 minutes.

II. Conduct a no-load trial run to verify that the barrel of the plastic extruder is properly heated and reaching operating temperature.

1. Close the circuit breaker to supply power to the control box;

2. Start the lubrication oil pump, lubricate the gearbox for 3 minutes, and apply lubricant to all lubrication points.

3. Inspect the hopper; it should be free of foreign objects. Then, rotate the V‑belt once more—its rotation must be smooth and unobstructed.

4. The screw is driven to operate at low speed during startup;

5. Observe whether the pointer movements of the voltmeter and ammeter on the plastic extruder are normal.

6. Verify that the screw rotation direction is correct.

7. The emergency stop button on the test equipment shall operate accurately.

8. Verify that the lubrication oil lines are unobstructed, that the oil‑spraying positions are correct, and that there are no oil leaks at any component.

9. Inspect the cooling water lines of the plastic extruder; there should be no leaks.

10. Remove the screw and verify that the high- and low-speed readings (r/min) of the screw drive shaft are consistent with those specified in the manual.