1、 Abnormal particle quality

1. Uneven particles

Reason: There is a large difference in raw material particle size, the sieve mesh is damaged or the mesh size is not matched, and the drum swing amplitude is abnormal.

Solution: Pre screen the raw materials to a uniform particle size, replace the damaged screen mesh (aperture error ≤ 10%), and calibrate the drum swing amplitude to a tolerance of ± 1.5mm.

2. Loose particles or rough surface

Reason: The moisture content of the material is too high (>15%) or too low (<10%), and the drum pressure is insufficient.

Solution: Adjust the moisture content of the material to 12% -14% and increase the contact pressure between the drum and the sieve (recommended to increase to 20% of the rated pressure).

3. The powder content of the finished product is too high

Reason: Aging of the screen sealing strip and low environmental humidity (<40%) leading to particle breakage.

Solution: Replace the silicone sealing strip, increase the ambient humidity to 45% -55%, and reduce the drum speed to 20-30 revolutions per minute.

　2、 Mechanical operation failure

1. The drum is stuck or stopped rotating

Reason: Foreign objects (such as metal debris) get stuck in the gap between the rollers, and the lubrication of the worm gear box is insufficient.

Solution: Clean up foreign objects after emergency power outage, replenish lubricating oil in the worm gear box to 2/3 of the oil window height, manually rotate the drum 3-5 times and restart.

‌2. Abnormal heating of bearings (>70 ℃)

Reason: Lubricating oil contamination or missing, bearing installation offset exceeding 0.1mm.

Solution: Replace the high-temperature grease (recommended NLGI grade 2) and calibrate the bearing coaxiality to a tolerance of ≤ 0.05mm.

　3. Severe vibration of equipment

Reason: Loose anchor bolts, uneven installation of screen mesh, and uneven material accumulation and loading.

Solution: Tighten the anchor bolts (torque ≥ 50N · m), reinstall the screen mesh and level it, and control the single feeding amount to ≤ 1/2 of the hopper volume.

‌3、 Production process issues

1. Frequent blockage of the sieve mesh

Reason: The material viscosity is too high (such as sugar content>20%), and the mesh size of the sieve is not selected properly.

Solution: Add 0.5% -1% magnesium stearate as an anti sticking agent and replace the large pore sieve (reducing the mesh size by 2-4 levels).

‌2. Granulation efficiency decreases

Reason: The wear of the drum leads to excessive clearance (>2mm), causing the transmission belt to slip.

Solution: Replace the worn drum liner and adjust the belt tension to a pressing depth of ≤ 10mm.

‌3. Dust leakage exceeds the standard

Reason: Insufficient air flow in the dust removal system (<800m ³/h) and aging of the sealing gasket.

Solution: Clean the dust accumulation in the dust removal filter bag, replace the fluororubber sealing gasket, and increase the local exhaust air velocity to 1.5m/s.

4、 Security related fault handling

1. Emergency stop triggered

Reason: Overload protection activated (current>120% of rated value), foreign object jamming.

Processing procedure: Immediately cut off the power, check for abnormal load points, manually reverse the drum 0.5 turns to remove the blockage, and then restart.

2. Electrical system malfunction

Phenomenon: The control panel has no display or the motor cannot start.

Troubleshooting steps: Check the main power supply voltage (380V ± 10%), ground resistance (≤ 4 Ω), and test the fuse for continuity.