How to identify and resolve die blockage issues in small fish food making machines caused by raw material problems? - Knowledge

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First, accurately identify the characteristics of mold hole blockage caused by raw material issues in automatic fish food making equipment to avoid misdiagnosis. Typical symptoms of this type of blockage include: blockage often occurs at the initial startup or after a batch change of raw materials, and the blockage location is concentrated at the edge of the die head outlet; the discharged blockage material contains obvious impurities (such as sand, metal fragments) or large, uncrushed raw materials; simultaneously, the extrusion effect is unstable, with particles appearing undercooked and cracked. For example, when using a new batch of corn to process pig feed, if the die head outlet becomes blocked within 10 minutes of startup, and the blockage material contains a large number of uncrushed corn particles, it can be determined that the blockage is caused by substandard raw material particle size. Furthermore, if the raw material has too high a moisture content, the blockage material will be sticky and adhere to the inner wall of the die hole, making it difficult to clean; if the moisture content is too low, the blockage material will be hard, mostly hard lumps formed after the raw material is compressed.

Targeted solutions should be implemented for blockages in fish feed production equipment caused by different raw material issues. If blockage is caused by uneven raw material particle size (including large particles), the machine must be stopped immediately. Clean the die head and puffing chamber of any remaining raw material, replace the screen (use a screen of 80 mesh or higher), and re-crush the raw material to ensure uniform particle size before restarting. If the blockage contains impurities, check the raw material cleaning equipment (such as a vibrating screen or magnetic separator) for malfunctions. After repair, perform a second cleaning of the raw material to remove impurities. If blockage is caused by excessive moisture content in the raw material, the raw material should be sun-dried or dried using a drying device to reduce the moisture content to 12%-15%. Add a small amount of bran (5%-10%) to improve the material's flowability. If the moisture content is too low, spray an appropriate amount of warm water into the raw material, stir well, and let it stand for 30 minutes before processing. For example, when processing fishmeal raw materials with excessive moisture content, first dry the fishmeal to 13% moisture content, add 8% bran and mix, then feed it into the puffing extruder to effectively prevent sticking and blockage.

Optimize the raw material pretreatment process to prevent blockage in small fish feed pellet making machines from the source. Establish raw material inspection standards. Before each batch of raw materials enters the warehouse, particle size, moisture content, and impurity content are tested. Unqualified raw materials are strictly prohibited from entering the warehouse. A complete set of raw material pretreatment equipment is configured, involving four processes: cleaning (removing impurities), crushing (ensuring particle size), mixing (uniforming moisture and composition), and conditioning (improving raw material plasticity). Especially for extruders, the conditioning stage can raise the raw material temperature to 80-90℃ by adding steam, allowing the starch to initially gelatinize, significantly improving raw material flowability and reducing the risk of clogging. For example, when processing pet food, after conditioning, the moisture content of the raw material is controlled at 14% and the temperature at 85℃. After entering the extruder, it can quickly pass through the die, resulting in stable extrusion and a significantly reduced clogging rate. Furthermore, avoid component conflicts when mixing different types of raw materials. For example, when mixing high-protein and high-starch raw materials, the ratio must be controlled to ensure balanced flowability.

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