The daily maintenance of the twin-screw fish feed production line needs to focus on the four cores of "cleaning, lubrication, tightening, and monitoring". Standardized processes should be formulated for key components such as screws, barrels, and molds to extend the life of the equipment and ensure production efficiency. The following are maintenance tips and operating points for screws and barrels, molds, and rotary cutting systems:
Maintenance tips for screws and barrels of twin-screw fish feed extruders
1. fish feed extruders Daily cleaning process: Clean while hot after shutdown. Add water to the idling screw immediately after production is completed to clean the remaining materials in the screw and barrel. The extruder of the twin-screw fish feed production line has a self-cleaning function and is easy to clean.
2. fish feed extruders Weekly wear detection: Observe the wear of the screw of the fish feed extruder frequently. It is usually recommended to replace the screw once a year, but it is also necessary to decide whether to replace it based on the specific production situation.
Maintenance of the mold and cutter system of the fish feed extruder
1. Tips for unblocking the mold channel
• Anti-blocking during production: Before each batch of production, apply edible oil (such as soybean oil) to the inner hole of the mold (aperture 1-3mm) to reduce material adhesion; if the discharge is not smooth, reduce the feed amount by 10%-15%, and increase the die head temperature by 5-10℃ (not exceeding 120℃) to avoid forced extrusion and mold deformation.
• Fish feed extruder Deep cleaning after shutdown: Use a special mold unblocking needle (diameter 0.1mm smaller than the aperture) to insert the hole from the feed end, and use an ultrasonic cleaner (temperature 60℃, time 15 minutes) to remove the residue in the hole. After cleaning, apply anti-rust oil (such as WD-40) to prevent oxidation.
2. Management of cutter bluntness
• Adjustment of the gap between the cutter and the die surface: Use a feeler gauge to adjust the distance between the cutter and the die surface to 0.5-0.8mm (if the gap is too small, it is easy to hit the cutter, and if it is too large, the particles are of different lengths). After adjustment, manually turn the cutter shaft to check if there is any friction noise.
• Blade replacement standard: When the cutter has a notch or the edge is worn, resulting in a particle cross-section burr rate of >5%, the blade needs to be replaced (it is recommended to replace it once every 200 tons of feed produced). When replacing, it needs to be replaced in pairs to ensure that the cutter is balanced (dynamic balance error ≤5g・cm).
The above are the daily maintenance skills and operating points of the screw and barrel, mold and rotary cutting system of the fish feed production line. The key to the longevity of the equipment lies in its use and maintenance, and good maintenance is crucial.
