The safe operation of the rotary granulator must strictly follow the standardized process. The following are the key points and precautions:
1、 Preparation before operation
1. Personal protection
Wear a safety helmet, dust mask, non slip shoes, and tight fitting work clothes (with tight cuffs and hem), and tuck long hair into the work cap.
Wear heat-resistant gloves (≥ 200 ℃) and protective face shields when in contact with high-temperature components.
2. Equipment and environmental inspection
The fasteners are not loose, the lubrication system oil level is normal (recommended lithium grease NLGI2 grade), and the electrical circuit is not damaged.
Clean up foreign objects inside and outside the equipment, ensure ventilation and absence of flammable materials in the work area, and ensure that safety devices (emergency stop button, protective cover) are intact and effective.
The mold/screen is securely installed, with no blockages in the screen holes, and the gap between the mold rollers is adjusted to 0.2-0.5mm (the pressure mold can drive the pressure rollers to rotate slightly).
2、 Operating standards during operation
1. Startup and parameter control
No load preheating: First, run at low speed for 5-10 minutes and observe that the motor current fluctuation is ≤ 10%.
The steam pressure is maintained at 0.3-0.4MPa, and the moisture content of the material is 12-13% (≤ 14.5% after tempering).
Slowly and evenly feed, current load ≤ 85% of rated value, temperature error: barrel ± 5 ℃, mold ± 3 ℃.
2. Real time monitoring and emergency response
If abnormal vibration (amplitude>0.15mm), noise, or sudden changes in current are detected, immediately shut down the machine.
When blocking materials: first stop feeding → loosen the pressure roller → clean the residue → restart, and do not force start or pull the gear shaft.
Add lubricating grease to the pressure roller every 2 hours to prevent the bearing from being bitten by high temperatures.
3、 Shutdown and maintenance
1. Standardize the shutdown process
Stop feeding 30 minutes in advance, gradually reduce speed to no load, and turn off the heating system.
Power off when the standby cylinder temperature is below 80 ℃, clean the residual materials in the mold, and reset the safety protection device.
2. Regular maintenance requirements
Add lubricating grease every week and check the screw wear (clearance ≤ 0.5mm) every month.
Change the engine oil for the first 500 hours of operation of the gearbox, and replace it every 3-6 months thereafter (68 # engine oil or 100-120 # gear oil).
The screen adopts a bayonet design for easy disassembly and cleaning, and the sealing is checked regularly to prevent dust from entering the bearings.
4、 Prohibition of high-risk behaviors
1. It is strictly prohibited to reach into the squeezing area or transfer objects across moving parts during operation.
2. It is prohibited to operate rotating parts with ordinary gloves (special protective gloves are required for high temperature/sharp scenes).
3. Eliminate the removal of protective covers, overload operation, or operation with faults.
Tip: New equipment with improved sealing structure (such as anti material intrusion reducer design) and bayonet screen can reduce maintenance risks. Accident prevention requires a combination of technical protection (emergency stop devices, limit switches) and management measures (training for all staff, accountability for violations).