On-line resistance-type grain moisture tester and control method thereof

Abstract

The invention discloses an on-line resistance-type grain moisture tester and a control method thereof. The tester comprises a transporter and a detection control device, wherein the detection control device comprises two grinding wheels on the rear end of the transporter, an operational amplifier the reverse input end and the syntropy input end of which are respectively connected with the two grinding wheels, an A / D (analog-digital) converter the input end of which is connected with the output end of the operational amplifier, and a control end connected with the output end of the A / D converter, wherein one grinding wheel connected with the reverse input end of the operational amplifier is connected in series with a fixed value resistor, and the control end is connected with a dryer controller. The on-line resistance-type grain moisture tester provided by the invention adopts intelligent automation operation; and when a grain drying machine operates, the tester can automatically carry out periodic detection on grain moisture and the inner temperature of the dryer according to parameters set by users and compare the detected result with the preset parameters, and other related operations are also automatically executed.

Description

[0001] Technical field [0002] The invention relates to the field of grain moisture detection devices, in particular to an online resistance type grain moisture tester and a control method thereof. Background technique [0003] my country is the world’s largest food producer and consumer. However, in my country, the loss rate of grain after harvesting, through threshing, drying, storage, transportation, processing, and consumption, reaches 18%, far exceeding the standard value set by the United Nations Food and Agriculture Organization. 5%. Grain moisture is an important factor that affects the quality of food, and it is also an important indicator that must be tested in the links of food storage, purchase, processing and transportation. If the moisture content of the grain is too high, it will cause the grain to rot and deteriorate during storage or transportation. Drying is the most effective way to reduce the mildew and spoilage of the grain due to high moisture content. H...

AI Technical Summary

Problems solved by technology

[0005] The existing grain moisture tester is to take out the grain in the drying bin, and then test it through the tester. Since the grains are randomly selected, the test results will not necessarily reflect the moisture value of all the grains in the drying bin, and When the moisture value is too low, the start and stop of the dryer cannot be automatically controlled, and the operator needs to control the operation at any time, which is quite troublesome.

Although there are online resistive grain moisture meters in foreign countries, their accuracy is not high, and the error is relatively large. During the drying process, the moisture value of the grain cannot be accurately detected. Drying can lead to the loss of grain protein

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