6309 Double-shaft Dust Humidifying Mixer

Working Principle

1. Feeding: Dry dust such as fly ash is evenly fed into the machine through an air-locking feeder to prevent air leakage and dust emission.

2. Double-shaft Mixing: Two parallel shafts fitted with spiral blades rotate reversely and synchronously. The blades shear and break up dust in a counter-impact manner to form a strong turbulent flow field.

3. Precision Spraying: Multiple groups of atomizing nozzles on the top spray water quantitatively according to feed rate, with the moisture content controlled at 15%–25%. Water mist fully adheres to dust particles.

4. Mixing & Conveying: Blades complete mixing while pushing materials forward to the discharge port, avoiding secondary dust during discharging.

5. Transmission & Sealing: Power is transmitted from motor to reducer and then to synchronous gears for twin shafts. Shaft ends adopt labyrinth combined with packing seal to prevent ash and water leakage.

Common Faults, Causes & Solutions

1. Discharge port blockage (Most frequent)

• Causes: Excessive water addition leading to sticky wet ash, overloaded feeding, worn/fouled blades, material caking at discharge port.

• Solutions: Stop feeding and water supply immediately, clear accumulated materials inside the chamber; adjust water volume and feeding capacity; repair or replace worn blades; flush the chamber and discharge port regularly.

2. Uneven humidification (Dry dust escaping / Over-slurried ash)

• Causes: Blocked or fallen-off nozzles, poor atomization, improper blade angle, incorrect water regulation.

• Solutions: Dismantle and clean nozzles; install a filter (≥50μm) at water inlet; adjust blade angle to 30°–45°; calibrate linkage of water supply and feeding.

3. Motor overload & tripping

• Causes: Excessive accumulated materials in chamber, insufficient lubrication or worn bearings, unstable voltage, foreign objects stuck between blades.

• Solutions: Clear materials before restarting; replenish lithium-based grease for bearings (every 100 operating hours) or replace damaged bearings; inspect power supply and install voltage stabilizer; remove foreign matters.

4. Severe vibration & abnormal noise

• Causes: Uneven installation, damaged bearings, loose or broken blades, bent shaft, worn gears.

• Solutions: Level the equipment and fasten foundation bolts; replace defective bearings; tighten or replace blades; straighten or replace bent shaft; inspect, repair and lubricate gears.

5. Ash/water leakage at shaft seal

• Causes: Worn packing, dust buildup in labyrinth seal, worn shaft journal.

• Solutions: Compress or replace packing; clean labyrinth grooves; repair shaft journal or replace seal assembly.

6. Rapid blade wear

• Causes: High resistance in dry dust section, poor water quality, hard impurities mixed in materials.

• Solutions: Adopt high-wear-resistant alloy or ceramic blades; filter inlet water; strictly block sundries from entering the machine.

Preventive Maintenance Tips

1. Keep material moisture content at 15%–25% to avoid blockage or dust emission.

2. Flush the chamber and nozzles per shift; inspect blades, bearings and seals weekly.

3. Install a grid at the feeding port to block bulk foreign objects.