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    [Temperature control of pulse hot press! 】

    Views: 153 times Release date: 2018-4-17 23:04:28

    This type of fast-heating equipment is not controlled by temperature response. Because there is a lag from heating to temperature response, even if there is no lag in temperature collection, it takes time to heat to heat up. As long as the temperature change is slow and stable, you can use the temperature response to control when not changing. Otherwise, it is difficult to control only the response lag, and the temperature lags from implementation to response. The faster the temperature, the more difficult it is to control. Therefore, aviation morning automation professionals do not advocate full response control.
    The collection speed is usually 200mS. It is enough for flashing. The rapid heating is mainly controlled by the heating power. The heating cannot be controlled by PID (the PID must be handled by itself when it is stable). Of course, the collection speed also has advantages immediately. Temperature speed In addition to the heating power, it is also related to the response speed of the sensor. The temperature transmission speed is the first assumption. Air conduction is the main assumption. The thickness of the sensor has a large effect. Even if the air reaches 300 degrees, the sensor will lag behind for some time to 300 degrees. The control method must be Write by yourself, the collection speed need not be too harsh.
    Assuming that the temperature rises faster and cools down faster, PID adjustment is not required, and continuous heating is turned off when the temperature is reached, and the ON / OFF control of heating when the temperature is low is not good, and the temperature is simply overshooting. The heating power should be preset in advance, and the required heating power is calculated to directly output this power. If stability is required, a part can be reserved for PID adjustment during stability.
    If the temperature is not stable, you can adjust the PID to try. If the adjustment is not good, you can consider the stable time to reduce the heating power. If the heating power is too large, it is not easy to stabilize. There is no external temperature shock, which is related to the working condition of the press, but the principle of temperature stability is heating amount = heat dissipation amount, temperature and temperature. If the heating is greater than the heat dissipation amount, the temperature rises. It is assumed that the amount of heat dissipation can be changed by using the PID of the thermostat. If it is too large, it will be supplemented by other methods.

        
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