On-line resistance type moisture sensor

Abstract

The invention discloses an on-line resistance type moisture sensor, and relates to detection equipment for grain moisture. The moisture sensor comprises a sampling device and a detection control device, wherein the sampling device consists of a motor provided with a motor gear and two roller components provided with rolling gears; roller components are meshed with each other via the rolling gears, the motor gear is meshed with one rolling gear; a signal board is arranged between the two roller components; both the signal board and the motor are electrically connected with the detection control device; one ends of the two roller components are provided with one rolling gear, and the other ends of the two roller components are respectively provided with a small rolling wheel and a large rolling wheel; and a gap between the small rolling wheel and the large rolling wheel is 0.3 mm to 1 mm, the width of the periphery of the small rolling wheel is 4 mm to 10 mm, and the width of the periphery of the large rolling wheel is 12 mm to 40 mm. The moisture sensor disclosed by the invention can automatically detect grain crops, is high in accuracy of detection of grain crop moisture, and is longer in service life and lower in application cost.

Description

technical field [0001] The invention relates to a detection device for grain moisture, in particular to an online resistance type moisture sensor. Background technique [0002] When food crops are stored and processed, the food crops themselves need to control a certain amount of moisture to prevent food crops from deteriorating or moldy during storage, thereby affecting the quality of processed food products. After the grain crops are harvested, the grain crops are generally dried by a grain dryer and then stored. During the drying process, the grain crops are sampled in real time, and the moisture content of the sampled grain crops is tested. [0003] The traditional device for sampling and testing the moisture content of grain crops is generally a hand-held grain moisture meter. After the grain dryer dries the grain crops, the hand-held grain moisture meter is used to manually sample and test the grain crops on a regular basis. Since it takes a long time for food crops t...

AI Technical Summary

Problems solved by technology

To sum up, if the number of grain crops between the two roller assemblies exceeds one, the measured resistance of the grain crops will have a large error with the normal measured resistance of one grain crop, so that the detected The moisture content of food crops is not accurate enough

[0007] (2) Since the rotating shaft drives the roller assembly to rotate at all times when the sampling device is working, and the reed is in direct contact with the rotating shaft, the moving rotating shaft directly contacts the reed dynamically, which not only makes the electrical connection between the reed and the rotating shaft not stable enough, Moreover, when the rotating shaft and the reed are in dynamic contact, the reed will be scratched, and the rotating shaft will scrape the reed for a long time, which will cause the reed to be worn

When the roller assembly detects food crops mixed with impurities, it will not be able to accurately measure the resistance value of the food crops due to the impurities in the food crops, which makes the detection of the moisture content of the food crops inaccurate.

When the diversion box assembly introduces food crops mixed with impurities, the diversion box may be blocked due to too much debris in the food crops, which will make the sampling device unable to work

[0009] (4) The motor in the sampling device usually uses an AC motor. The AC motor not only has high power, but also increases the cost of use, and it is not easy to control the circuit

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