Le guide ultime de dépannage des usines d'émulsion de bitume

Running a Bitumen Emulsion Plant requires precision. The combination of high-temperature asphalt, acidic water solutions, and high-speed shearing means that even top-tier equipment needs proper maintenance.

When your plant stops, your road construction project stops. Based on the engineering manual of our highly reliable Feiteng GRL-6 Bitumen Emulsion Plant, we have compiled the most common operational faults and their immediate solutions.

Bookmark this guide to keep your production line running smoothly.

1. Bitumen Pump Issues: No Output or Pump Not Turning

The bitumen pump is the heart of the material supply. If asphalt isn’t flowing, check these common culprits:

• Symptom: The pump motor is running, but there is no bitumen output.

  • Cause: The motor might be rotating in reverse.

  • Solution: Immediately turn off the power and adjust the cable plug (swap any two phase wires) to correct the motor’s rotation direction.

• Symptom: The bitumen pump refuses to turn upon startup.

  • Cause: Inadequate preheating. Bitumen inside the pump casing has solidified.

  • Solution: Ensure full preheating using the thermal oil tracing system. Never force-start a cold pump, as this will snap the coupling or burn out the motor. Check if the thermal oil preheating valve is fully open.

2. Excessive Pump Vibration and Abnormal Noise

If your bitumen pump or water circulating pump sounds like it’s grinding gears, do not ignore it.

• Cause 1: Non-concentricity. The pump bearing and the motor bearing are no longer perfectly aligned (often caused by thermal expansion or ground shifting).

  • Solution: Stop the machine and manually adjust the concentricity of the pump and motor shafts.

• Cause 2: Coupling Cushion Damage. The rubber cushion (spider) inside the coupling has worn out due to long-term heavy load.

  • Solution: Replace the coupling cushion. Tip: Keep spare cushions from Feiteng Parts & Services in your site inventory.

3. Colloid Mill (Emulsifier) Faults: Low Flow or Jamming

The high-shear colloid mill is the most critical component for ensuring the $ ≤ 5 µm$ emulsion fineness.

• Symptom: Insufficient flow from the emulsifier.

  • Solution A: Check if the motor is reverse-rotating (adjust the cable plug).

  • Solution B: The clearance between the stator and rotor might be too small, restricting the flow. Slightly loosen the adjusting ring to increase the clearance.

• Symptom: The grinding head “bites to death” (Jammed completely).

  • Cause: Hard debris (like stones or metal shavings from the bitumen tank) has bypassed the filter and stuck inside the grinding teeth.

  • Solution: Do not force the motor. You must dismantle the grinding head, manually clean out the debris, and inspect the stator/rotor for physical damage. Always ensure your Bitumen Filters are cleaned regularly!

4. Temperature Controller Showing Abnormal Readings

Accurate temperature control is vital. Mixing water and bitumen at the wrong temperatures will cause the emulsion to break immediately.

• Symptom: The digital temperature display is jumping wildly or showing errors.

  • Cause A: The PT100 temperature sensor has failed. -> Action: Replace the sensor.

  • Cause B: Loose signal line connections. -> Action: Open the control cabinet and tighten the terminal ends.

  • Cause C: Signal interference. -> Action: Ensure the shield wire has a single-point grounding and keep the sensor wires away from strong magnetic fields (like heavy-duty contactors).

Pro Maintenance Tips for Emulsion Plants

To avoid the above troubleshooting steps altogether, follow the Feiteng Golden Rules of Maintenance:

1. Flushing is Mandatory: After every single production shift, flush the colloid mill and pipelines with hot water or high-pressure air. Leaving emulsion in the mill will cause it to separate and rust the internal parts.

2. Lubricate the Agitator: Regularly fill the agitator bearing parts with grease using the designated grease fittings.

3. Check Thermal Oil Filters: Clean the thermal oil filters regularly, especially during the first few weeks of running a new machine, to ensure the heating system remains efficient.

Need Reliable Equipment or Spare Parts?

Older plants often suffer from chronic pump and mill failures. If your plant is costing you too much downtime, it might be time for an upgrade.

Le Feiteng GRL-6 Series is designed with frequency conversion controls, high-strength stainless steel colloid mills, and fail-safe thermal tracing to prevent these exact headaches.

Contact Feiteng Engineers Today for a free consultation or to order replacement parts for your existing setup.