How to Repair floating fish feed pellet production line Blockage Efficiently?

The core causes of blockages in extruders fall into three main categories: abnormal raw material characteristics, improper parameter settings, and aging equipment components. Regarding raw materials, a sudden increase in moisture content (exceeding 20%) or the presence of large particles (such as uncrushed grains or metal lumps) can easily create a "bridge" at the feed inlet or cause blockages within the extrusion chamber. In terms of parameter settings, excessively fast feed speed, excessively low screw speed, or insufficient heating temperature can lead to prolonged residence time of the raw material in the extrusion chamber, causing it to gradually adhere and accumulate. Aging equipment components manifest as screw wear and a smaller die orifice diameter, increasing the resistance to raw material transport and ultimately leading to blockages.

A safety check must be conducted before repairs; this is crucial to preventing accidents. First, the main power supply to the extruder must be disconnected, the heating system turned off, and operations should only commence after the extrusion chamber temperature has dropped below 50°C and the screw has completely stopped rotating. Simultaneously, clean up any loose raw material around the equipment, leave sufficient operating space, and wear high-temperature resistant gloves, goggles, and other protective equipment to prevent burns from residual high-temperature material.

The repair methods differ depending on the location of the blockage. If the feed inlet is clogged, first use a special plastic shovel to clean the accumulated raw material on the surface of the feed inlet, then use a long-handled soft brush to unclog the feed channel, avoiding scratching the inner wall of the feed inlet with metal tools. If the blockage occurs between the extrusion chamber and the screw, the die head must be disassembled first. Use the cleaning rod provided by the manufacturer to push it in from the discharge end in the opposite direction to loosen the blockage of raw material in the chamber, then manually rotate the screw (using a special wrench) to gradually discharge the raw material. For tightly bound charred raw materials, a "warm water soak + soft brush cleaning" method can be used. Soak the disassembled screw and die head in 40-50℃ warm water for 30 minutes until the charred material softens, then clean it thoroughly.

After repair, the machine cannot be started directly. Adjustments and preventative measures are required. First, assemble the equipment and run it empty for 5-10 minutes to check if the screw rotates smoothly and if the die head discharges evenly. Simultaneously, adjust production parameters: if blockage is caused by excessively high raw material moisture, the raw material must first undergo low-temperature drying; if the blockage is due to improper parameters, reduce the feed rate, increase the screw speed, or appropriately raise the heating temperature (usually by 5-10°C for dry extruders). Furthermore, a vibrating screen and magnetic separator should be installed at the feed inlet to filter impurities and metal particles, reducing the risk of blockage at its source. Mastering this repair process can limit extruder downtime to 1-2 hours, minimizing production losses.

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