Schematic model
FG6080FWC
Service
Lubrication, troubleshooting, wear parts and adjustment steps, taken from the BellaEx water-cooled flaking mill manual.
Maintenance schedule
| Item | Interval | Requirement | |
|---|---|---|---|
| Feed-roll bearing grease points (both sides) | Daily | High-temperature grease, dropping point above 320 °C | |
| Roll bearing grease points (①②) | Weekly | Same grease; grease points on both sides | |
| Upper and lower slide grease points (③④) | Weekly | Same grease | |
| Cooling-water rotary joints | Every 1–3 months | Mobil grease HP, NLGI 2 | |
| Bearing temperature | Check often | Within 1–3 h of start-up at ambient: max 40 °C. Continuous operation: max 70 °C | |
| Clean bearings and renew grease | Monthly | Clean all bearings and refill with new grease | |
| V-belt wear and tension | Regularly | Adjust or replace as soon as belts slacken | |
| Pulley taper-bush screws | After the first 0.5–1 h of running, then monthly | Retighten to the specified torque; weekly if the drive runs in both directions | |
| Bolts, nuts and lock plates | Check often | Check for looseness, especially above the rolls | |
| Cooling-water lines | Regularly | Check fittings, ageing seals, worn internal roll pipes and leaks | |
| Hydraulic oil | Every 6–12 months | Replace the oil | |
| Full service or overhaul | Once a year | Inspect the rolls (replace when the alloy layer is worn through), check wear parts, remove rust and re-protect |
Troubleshooting
| Symptom | Possible cause | Remedy | |
|---|---|---|---|
| Whole grain at both roll ends | 1. Cheek plates not sealing 2. Roll end faces not aligned | 1. Adjust the cheek plates 2. Adjust the rolls so their end faces line up | |
| Flakes thrown off the outer roll | Scraper gap too large | Adjust the scraper | |
| Uneven flake thickness | Gap differs between the two roll ends | Adjust the slide blocks at both ends | |
| One or both rolls won’t open | Relief valve blocked | Clean the relief-valve spool; replace the hydraulic oil (every 6–12 months) | |
| Rolls won’t close | Closing pressure too low or absent | Adjust the hydraulic pressure; clean the relief valve and check the solenoid coils |
Wear parts
FG6080FWC
| Part | Specification | Qty | Location |
|---|---|---|---|
| Bearing | 23228CAK/W33 | 4 pcs | Rolls |
| Bearing | UCFC209 | 4 pcs | Feed roll |
| V-belt | SPC4879 | 4 pcs | Main motor |
| V-belt | SPC3707 | 4 pcs | Main motor |
| Cheek plate | 6080 | 2 pcs | Side wall |
| Scraper | 800×130×6 | 2 pcs | Base |
Adjustment guides
Setting the hydraulic pressure
- Set the selector to manual and start the pump; seen from the fan cover the motor should turn clockwise.
- Press Close rolls and slowly turn the relief valve clockwise until the black needle reads 4.0 MPa.
- Set the green low-pressure needle to 3.5 MPa and the red high-pressure needle to 4.0 MPa; the working pressure stays in this band.
- Adjust the feed pressure-reducing valve to 1.5–2.0 MPa.
- Try open/close rolls, feeder on/off and gate open/close; check every movement completes and nothing leaks.
Note: Factory setting 3.5–4.0 MPa; adjust to suit the material.
Roll gap and flake thickness
- Loosen the adjustable handle, turn the sleeve a few turns anticlockwise and centre the slide block.
- Close the rolls in manual mode so they touch fully, then tighten the sleeve clockwise by hand.
- Open the rolls and turn both sleeves clockwise by the same amount: 0.1 mm per division, 2 mm per turn.
- Close the rolls, check both ends with a feeler gauge, and lock the handle when they match.
- While running, fine-tune with the slide blocks: for thicker flakes loosen the upper screw and tighten the lower one, the reverse for thinner. Adjust both sides together and take samples as you go.
Scrapers
- With the rolls closed, reach in through the middle door and loosen the fixing screws and the adjusting-screw nuts on both sides.
- Turn the adjusting screws to set a scraper-to-roll gap of 0.1–0.2 mm.
- Tighten the nuts and fixing screws, then open the rolls.
- When a worn scraper becomes too narrow, move it to the spare holes below.
Cheek plates
- Set the working roll gap first, then stop the mill.
- With the rolls closed, set the cheek plates 0.2–0.3 mm from the roll surface.
- Fix them in place, then open the rolls.
Connecting the cooling water
- Connect the external supply and return ports to mains or a recirculating water system.
- Open the inlet valve and check the lines for leaks.
- Before starting the roll motors, make sure the rotary joints turn freely and are undamaged.
- Grease the rotary joints every 1–3 months with Mobil grease HP (NLGI 2).
Fitting and removing taper-bush pulleys
- Fitting: clean the pulley bore, the bush inside and out and the screws with petrol; surfaces must be clean and dry.
- Fit the key in the shaft keyway, slide the pulley on, then push the bush in over the key (tap the large face lightly with a soft mallet if needed).
- Line up the holes, run the screws (with washers) in evenly and tighten them alternately to the specified torque. Never force them.
- Retighten to torque after 0.5–1 h of running.
- Removal: take out the fitting screws, screw them into the bush’s jacking holes and tighten alternately until the bush releases; remove the bush first, then the pulley.
Start-up with product
- Clear any foreign material, run a no-load trial and turn on the cooling water.
- Start the main motors first; once they run smoothly, start the pump.
- Select automatic and press Program start: rolls close → gate opens → feed roll starts → pump stops.
- Take samples from both ends and the middle at intervals to check thickness and gelatinisation; adjust the slide blocks for thickness, steam and feed rate for gelatinisation.
- Program stop sequence: feed roll stops → gate closes → rolls open.
Safety
- Read the manual before use and follow the operating procedures.
- Use original spare parts only.
- Before starting the roll motors, check the cooling-water rotary joints for binding or damage.
- Before running with product, clear foreign material, run a no-load trial and turn on the cooling water.
- Stop the mill and isolate the main power before maintenance or cleaning; refit guards and doors before restarting.
- In an emergency, press the emergency stop and switch off the main power.
Contact service
Emailray@bellaex.com
Phone+86-13810151555
