Grain moisture analysis meter and method and grain drying system

Abstract

The invention relates to a grain moisture analysis meter which comprises a hopper, a plastic plate, a sensor plate, a base plate, a base plate motor and a control circuit. The hopper is vertically placed, the top of the hopper is provided with an opening used for receiving grains, the bottom of the hopper is sealed by the base plate, the base plate opens and closes the hopper under the drive of the base plate motor, at least one side wall of the hopper is provided with a slot, the plastic plate is embedded into the slot, the sensor plate is attached to the plastic plate to be arranged on the outer side of the hopper and insulates from the hopper, and the hopper and the sensor plate are made of conductive materials and form a positive electrode and a negative electrode of the capacitive grain moisture analysis meter. The invention further relates to grain moisture analysis method and a grain drying system.

Description

technical field [0001] The invention relates to a grain moisture analyzer, an analysis method and a grain drying system in the continuous grain drying process. Background technique [0002] Grain drying is the basic goal of grain storage. Food that is not dry enough has the risk of being rotten and even causing a fire. [0003] In the drying process of grain, the detection of moisture in grain is a necessary task. [0004] The traditional on-line detection of moisture in the grain drying process mostly uses methods such as capacitance method or resistance method for detection. Recently, new research and trends have emerged in China that use weight for online moisture detection and control. [0005] The principle of online moisture detection by resistance method is to use the correlation between grain moisture and its resistance value to indirectly measure grain moisture. High moisture has low resistance, and low moisture has high resistance. Resistive moisture sensors are...

AI Technical Summary

Problems solved by technology

[0006] The disadvantages of the existing on-line moisture detection by resistance method are: ① When the moisture content of the grain is uneven and contains many green and uncooked grains, the detection value error is relatively large; ② The structure is complex and there are many faults; ④ It can only adapt to grains with similar properties and particle sizes, such as rice and wheat. When the type of grain changes, the sensor needs to be greatly changed. That is to say, a specific detector can only detect specific grains. The types of grains are less versatile for a variety of grains; ⑤The detected grains are damaged and cannot be stored or used, which belongs to destructive testing: ⑥The detection accuracy of high moisture grains is low

[0008] The disadvantages of the existing online moisture detection by capacitance method are: ①Inconvenient installation and maintenance; ②The detection accuracy is greatly affected by the environment and grain temperature and humidity, grain density, and grain flow rate; ③When the grain contains high impurities, the monitoring error is large

However, this online detector has the following disadvantages: 1. Since the positive and negative electrodes are all exposed to the flowing wet grain, the passage of the grain will affect the capacitance characteristics between the positive and negative electrodes. If the grain contains iron wire Conductive impurities can easily short-circuit the capacitor plates; 2. Secondly, long-term use will cause the capacitor plates to be thinned by a large number of passing grains, resulting in further changes in the capacitance characteristics between the capacitor plates, and this change in capacitance characteristics is very large. Difficult to calibrate; 3. Since the grain is elongated and the capacitor plate itself is also elongated, at the upper and lower ends of the capacitor plate, the contact pattern between the grain and the capacitor plate will also affect the accuracy of capacitance measurement, for example, The tip of the grain has a different capacitance to the upper end of the plate than the elongated side of the grain to the upper end of the plate, so this uncertainty further leads to inaccurate capacitance measurements

The weight detection method has the advantages of high precision and good stability, but also has the disadvantages of inconvenient installation and difficult elimination of dynamic errors

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