The standard operating procedure for the automatic feeding system must follow the steps of "system check - parameter preset - linkage start - dynamic monitoring" to ensure efficient coordination between feeding and the extruder: Step 1: System check. Before feeding, check whether the hopper, screw conveyor, level sensor, and control system are functioning properly. Ensure the raw material in the hopper is sufficient and meets pre-treatment standards. Ensure the screw conveyor is free of jamming and well-sealed. Verify the sensitivity of the level sensor and the smooth operation of the control system circuitry. Simultaneously check the linkage function between the automatic feeding system and the small fish feed pellet making machine to ensure that the feeding speed, screw speed, and extrusion temperature are linked and controlled. Step 2: Parameter preset. Preset parameters according to the extruder's capacity and raw material characteristics. The feeding speed must match the extruder's hourly output (e.g., for a twin-screw extruder with an hourly output of 500 kg, the feeding speed is preset to 8-10 kg/min). Set the upper and lower limits of the level sensor to 20%-80% of the hopper volume to avoid empty or overflowing hoppers. Simultaneously, preset linkage thresholds so that the feeding speed is automatically adjusted when the screw speed fluctuates by ±5 r/min or the extrusion temperature fluctuates by ±5℃. The third step is the coordinated startup. First, start the automatic feeding system and run it unloaded for 3-5 minutes to check the operation of the screw conveyor and the feedback from the material level sensor. Then, start the extruder for preheating. After the equipment parameters stabilize, start the coordinated feeding mode. The system automatically replenishes raw materials based on the material level sensor feedback to maintain a stable feed. The fourth step is dynamic monitoring. During the feeding process, observe the control system data in real time, including feeding speed, material level in the hopper, screw speed, and extrusion temperature. If parameter fluctuations occur, fine-tune the feeding speed in time to ensure that the feeding and extrusion rhythms are matched.
The core parameter control techniques of the automatic feeding system. The key to parameter control is to achieve the coordination of "feeding speed, screw speed, and extrusion temperature": First, feed speed control is precisely adjusted according to the production capacity and raw material characteristics of the Best pet food pellet machine. When processing high-fiber raw materials, the feeding speed is appropriately reduced by 10%-15% to avoid excessive pressure in the extrusion chamber; when processing high-protein raw materials, the feeding speed can be appropriately increased by 5%-10%, combined with increasing the screw speed, to ensure that the raw materials are fully processed. The feeding speed of the screw conveyor is adjusted via a frequency converter, typically within the range of 20-50Hz. Higher frequencies result in faster feeding speeds, requiring gradual fine-tuning to avoid sudden increases or decreases. Secondly, level sensors control the system, adjusting upper and lower thresholds according to production rhythm. For large-scale continuous production, the lower threshold is raised to 30% to prevent frequent empty hoppers and feeding interruptions. For small-batch, multi-batch production, the upper threshold is lowered to 70% to prevent raw materials from remaining in the hopper for too long and becoming damp and deteriorating. Thirdly, linkage parameters are optimized. If excessive feeding leads to screw overload, the feeding speed should be reduced while appropriately increasing the screw speed. Conversely, if excessive feeding leads to over-gelatinization of the raw materials, the feeding speed should be increased, and the extrusion temperature stabilized to ensure optimal puffing.
Daily maintenance and troubleshooting of the automatic feeding system. Maintenance points for small cat food making machine: After daily production, clean the hopper and screw conveyor of residual raw materials to prevent drying and corrosion of the equipment; check the sensitivity of the level sensor weekly, wipe the sensor probe with a clean cloth to prevent raw material dust from affecting the feedback accuracy; check the screw conveyor bearings and seals monthly, add lubricating oil, replace aged seals, and tighten bolts at the connection points; regularly calibrate the control system to ensure accurate parameter feedback and timely linkage control. Common fault handling: 1. Level sensor malfunction, manifested as no alarm when the hopper is empty or overflow when the hopper is full. The solution is to stop the machine, clean the sensor probe, calibrate the sensitivity, and replace it promptly if damaged; 2. Screw conveyor jamming, manifested as a sudden drop in feeding speed and abnormal motor noise. The solution is to stop the machine, check for impurities or clumps of raw materials in the conveyor, check for bearing wear, and repair or replace if necessary; 3. Unstable feeding speed, manifested as large parameter fluctuations and uneven output. The solution is to calibrate the frequency converter, check the linkage control system, adjust the linkage threshold, and check the uniformity of the raw materials to ensure that pretreatment meets standards.
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