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Application of Temperature Sensor Technology in Grain Dryer


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     In the field of agricultural machinery, small grain dryers can dry high-moisture rice, wheat, corn, soybeans and other cereals, and can also play a bactericidal role. Since the initial moisture and drying time of the grain determine the drying temperature, in order to obtain a safe drying temperature, it is necessary to perform a plurality of sampling tests by means of a temperature sensor to calculate and determine the temperature change time.


                          (Grain drying processing diagram)

    In the grain drying process, in the season when the temperature difference of the outside world changes greatly, we should pay close attention to the measures of ventilation cooling and dehumidification. Otherwise, the heat transfer will cause the phenomenon of “capping” and “hanging the wall”, causing food condensation. , mildew and mildew, reduce food quality.

    At the initial stage, the heater of the dryer is started. When the temperature sensor detects the temperature of the air in the drying chamber, compared with the set temperature, the single-chip microcomputer controls the heater to gradually increase the power from the low power. After heating, the temperature rise has a certain lag, and the increase rate of the heating power is lower than the lag time, that is, the temperature measured by the temperature sensor should be measured under the condition that the drying chamber environment is thermally stable.


                                     (grain dryer diagram

    In addition, in the grain dryer, a moisture sensor is also used, and the corresponding measurement signal of the moisture content of the measured grain is sent to the subsequent circuit processing, and through the study of the conductive characteristics of the grain, the obstruction of the grain in a certain frequency band is presented. In the lower state, its conductivity is proportional to the moisture content. In this way, it can be reflected on the display to determine the speed of the wind and whether to perform secondary drying.

    For example, in practical applications, a thermocouple temperature probe based on temperature sensor technology can be used to monitor the temperature change in the drying tower and the change of grain moisture, thereby adjusting the speed of the drying tower to control the drying. The dryer reaches the required moisture.


                                            (grain dryer diagram

    After using various types of IoT sensor technology, the traditional dryer is no longer a simple drying machine. The intelligent terminal control cabinet on the dryer is equivalent to the visual nervous system. The temperature sensor and moisture meter are equivalent to the tactile nervous system. The Internet of Things corresponds to the motor nervous system. The big data information transmitted by the cloud from various users through the GPS device constitutes the hub. The core of the nervous system, thus achieving quality control, fault alarm, intelligent analysis, precise positioning and other services, greatly improving the efficiency of the work.

    The above is the application of the temperature sensor technology in the grain dryer introduced by the sensor expert network. In the field of dryers, in recent years, various intelligent control technologies have led to product upgrades and demand upgrades, creating new market demands. It is believed that in the future, with the further development of domestic smart agriculture and the further integration of sensors, more sensor technologies will be used in the drying process of grain and grain.