How to Troubleshoot and Repair fish Feed Pellet Lines?

First, it's essential to define the normal temperature range of the extruder: the temperature of the extrusion section in a dry extruder is typically 120-150℃, while in a wet extruder, due to steam-assisted heating, the temperature is slightly lower, at 100-130℃. When the temperature is abnormal, first determine whether the abnormality is systemic or localized (feeding section, extrusion section, discharge section) using the temperature control instrument, and then troubleshoot accordingly.

Common causes and repair methods for excessively high temperatures:

1. A short circuit in the heating element or a malfunctioning temperature controller causes the heating system to continuously heat up. During troubleshooting, first turn off the heating power and use a multimeter to check the resistance of the heating element. If the resistance is 0%, it indicates a short circuit in the heating element, requiring replacement with the same model. If the heating element is normal, check the temperature controller. Lower the temperature setting on the temperature controller and observe if the temperature drops. If the temperature does not change, the temperature controller needs to be replaced.

2. Poor raw material delivery leads to excessive frictional heat generation within the extrusion chamber. At this point, it's necessary to check if the feeding speed is too slow or if the screw is worn, causing obstruction of raw material transport. If the feeding speed is abnormal, adjust the feeding system parameters; if the screw is worn, it needs to be polished and repaired or replaced. Thirdly, a cooling system malfunction, especially in wet extruders, could cause problems. If the cooling water pipes are blocked, use a high-pressure water gun to flush the pipes and restore cooling function.

The key to troubleshooting excessively low temperatures lies in the heating and heat retention processes. First, check if the heating system's power supply is normal and if the fuse is blown. If blown, replace it with a fuse of the same specification. Second, check if the heating element surface is covered with excessive burnt material from raw materials, affecting heat dissipation efficiency; clean the surface of the heating element. For wet extruders, insufficient steam pressure is the main cause of low temperature. Check if the steam generator is working properly and if the steam pipes are leaking. If leaking, repair with sealant or replace the pipes. Additionally, damage to the extruder's insulation layer can also lead to heat loss; re-wrap the machine body with high-temperature resistant insulation cotton to reduce heat loss.

After repair, a small-batch trial production is required for verification: Raw materials are added according to the normal formula, and the temperature of each stage is monitored to ensure it remains stable within a reasonable range. The color, hardness, and degree of ripeness of the finished granules are observed. If the finished product has no burnt smell and the granules are intact, the temperature problem has been resolved. Simultaneously, a regular temperature inspection system should be established, recording temperature data for each stage every hour, and any fluctuations should be addressed promptly to prevent recurrence of the problem.

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