Optimization and Troubleshooting Techniques for Dry Type Pet Feed Extruder Line Equipment Systems

The core of optimizing the floating food production line equipment system is improving the response speed of heating and cooling. Regarding the heating device, traditional resistance heating coils are replaced with electromagnetic heaters, increasing heating efficiency from 50%-60% to over 90%, and providing faster heating speed; the temperature rises from room temperature to 150℃ in only 5-8 minutes, far faster than the 15-20 minutes of resistance heating. Simultaneously, electromagnetic heaters of different power are matched according to the heat requirements of different sections of the extruder: the power in the expansion section is increased (e.g., 2.5kW per meter), while the power in the feeding section is reduced (e.g., 1.5kW per meter), ensuring precise heating. For the cooling system, a spiral water-cooling jacket is added to the outer wall of the barrel, forming a dual cooling system of "water cooling + air cooling" in conjunction with an air-cooled fan. When the temperature exceeds the target range, the water cooling system can quickly intervene within 30 seconds to reduce the temperature to the target range.

Optimization of the temperature detection and control system is key to precise temperature control. The standard thermocouple sensor was replaced with a PT100 platinum resistance sensor, improving the measurement accuracy from ±1℃ to ±0.1℃. The sensor's installation position was also adjusted from near the heating coil to the melt side of the inner wall of the barrel to avoid measurement deviation. The PLC control system was upgraded, adding a "temperature-speed linkage" function. When the extruder screw speed increases (due to increased mechanical shear heat generation), the system automatically reduces the heating power; when the speed decreases, it automatically increases the heating power, achieving dynamic temperature balance. Simultaneously, temperature parameter templates for different feed types are preset in the control system, allowing for one-click recall when switching production varieties, reducing adjustment time.

Common temperature anomalies require rapid and accurate handling. If the temperature fails to rise, first check if the heating device is faulty. Use a multimeter to check the output voltage of the electromagnetic heater; if the voltage is 0, replace the faulty heater or control module. Next, check the raw material moisture content; if the moisture content exceeds 16%, extend the drying time to reduce the moisture before processing. If overheating occurs, first check the cooling system for blockages, and clean scale from the water-cooled jacket and dust from the air-cooled fan. If the cooling system is normal, check the screw speed and appropriately increase the speed to increase the feed rate, allowing the raw material to absorb some heat and lower the barrel temperature.

Excessive temperature fluctuations are another common problem, often caused by loose sensors or uneven feed. To handle this, first re-secure and calibrate the sensor to ensure accurate measurements; then check the feeder. If the feed rate fluctuates, adjust the feeder speed to a stable level, and if necessary, replace it with a variable frequency feeder to achieve uniform feeding. If localized overheating occurs (such as a sudden temperature rise in a certain area of ​​the extrusion section), it may be due to raw material clumping and blockage inside the barrel. Immediately stop the machine, disassemble the barrel to clean out any remaining raw material, and check the fit clearance between the screw and the barrel. If the clearance is too large, replace the screw to prevent raw material from accumulating and burning.

Daily maintenance of the animal food extruder line is crucial for temperature control. Clean the dust off the heating device and sensor surfaces weekly, calibrate the temperature sensor and control system monthly, check the sealing and operating status of the cooling system quarterly, and replace aging seals and water pipes in a timely manner to ensure that the equipment system is always in good operating condition and provide hardware support for precise temperature control.

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