What are the operating techniques for an aquatic feed production line?

The requirements for raw material pretreatment in dry-type fish feed extruder lines are far higher than those for livestock and poultry feed. This is because fish and shrimp have unique feeding environments, requiring feeds with good stability and nutritional balance. This necessitates precise control over every operational detail in the pretreatment stage.

The core of raw material screening is "removing impurities and purifying the feed," necessitating a dual screening mechanism. The first stage uses a vibrating screen, adjusting the screen mesh size according to the raw material type. Animal protein raw materials such as fishmeal and shrimp meal use a 20-mesh screen to remove bone fragments and impurities; plant raw materials such as corn and soybean meal use a 12-mesh screen to separate stones and soil. The second stage requires magnetic separation equipment, using a strong magnetic field to adsorb metal debris from the raw materials, preventing subsequent equipment wear and the risk of fish and shrimp accidentally ingesting it. During operation, the metal collection box of the magnetic separator must be cleaned every 2 hours to ensure the magnetic field strength is stable above 12,000 Gauss. If the magnetic field strength drops below 8,000 Gauss, it is necessary to remagnetize or replace the magnets promptly.

The key to the pulverization stage in animal feed extruder lines lies in "controlling particle size as needed," as different aquatic animals have significantly different requirements for raw material particle size. Fish fry feed requires raw materials to be pulverized to a fineness of 100 mesh or higher, with particle diameters less than 0.15 mm, to ensure easy digestibility and absorption. An ultrafine pulverizer should be used, and fine particle size can be achieved by adjusting the hammer mill speed (controlled at 3000 rpm). For adult fish feed, the raw material particle size can be controlled at 60-80 mesh, and a regular hammer mill is sufficient. The gap between the hammer mill and the screen should be maintained at 1-2 mm to avoid over-pulverization and increased energy consumption. Particle size should be tested for each batch during the pulverization process, using a standard sieve. If the particle size does not meet the requirements, the screen aperture or feed rate should be adjusted promptly. The feed rate should be maintained at a level that prevents equipment blockage and ensures stable current.

The conditioning process in the floating feed production line is crucial for improving feed quality. The core technique is "precise temperature and humidity control." The conditioning temperature for aquatic feed needs to be adjusted according to the raw material formula. For feed with fishmeal as the main ingredient, the conditioning temperature should be controlled at 95-100℃ to ensure sufficient protein denaturation. For feed with plant-based ingredients, the temperature should be controlled at 85-90℃ to prevent excessive starch gelatinization. Humidity control is even more important. The humidity of the raw materials should be adjusted to 16%-18% using a steam spray system. When the humidity is below 15%, the feed is prone to dust; when it is above 19%, it is prone to sticking to the equipment. During operation, the condition of the raw materials after conditioning should be monitored in real time. The ideal condition is that the raw materials can be clumped together when squeezed by hand, but can be easily broken apart when lightly touched after being released. At the same time, temperature and humidity data should be recorded every hour to form a traceability record.

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