Microwave type intelligent grain moisture detector

Abstract

The invention belongs to the field of moisture detection instruments, and particularly relates to a microwave type intelligent grain moisture detector. The microwave type intelligent grain moisture detector comprises a rack, a motor, a gearbox, a No.1 conveying belt, a guide plate, a No.2 conveying belt, a leveling unit and a measuring unit; the motor is arranged at the rear portion of the rack; the No.1 conveying belt is arranged on the rack; the motor drives the No.1 conveying belt to rotate through the gearbox; one side, far away from the motor, of the No.1 conveying belt is provided with the No.2 conveying belt; the arc-shaped guide plate is arranged between the No.1 conveying belt and the No.2 conveying belt; the right side of the No.2 conveying belt is provided with the leveling unit which is used for leveling the grain thickness; and the right side of the leveling unit is provided with the measuring unit, and the measuring unit is used for measuring the grain moisture content. According to the invention, the grains on the No.1 conveying belt are divided onto the No.2 conveying belt and a No.3 conveying belt through the guide plate, a scraping plate scrapes redundant grains off the No.3 conveying belt, the thickness consistency of the grains detected by the measuring unit is guaranteed, and the grain moisture detection precision is improved.

Description

technical field [0001] The invention belongs to the field of moisture detection instruments, in particular to a microwave-type intelligent grain moisture detector. Background technique [0002] The moisture content of grain is an important indicator for evaluating grain quality and a basic item for grain testing. Normal grains contain an appropriate amount of moisture, and the moisture content is usually kept within a certain range, which is necessary for the grain to maintain life and maintain its inherent quality and edible quality. Due to the impact of harvest time, maturity and climatic conditions, the moisture content of grain is a variable value. The detection methods of grain moisture can be summarized into two categories: non-destructive testing and destructive testing. Non-destructive testing refers to measuring the moisture content of the grain itself through its physical, optical and chemical properties without destroying the original state and chemical properti...

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Problems solved by technology

[0004] The microwave attenuation method is based on the fact that the dielectric constant of water is much larger than that of ordinary dielectric materials. Therefore, even a slight change in the free water content in the material will cause changes in the dielectric properties of the material, and the response is very sensitive. However, the accuracy is low, only 1%, and the dielectric constant is affected by temperature, material density, material purity, and the distance between the detected object and the detection sensor; The distance between the detected grain and the microwave transmitter head is constantly changing, which affects the detection accuracy of the moisture detector. At the same time, the iron and straw impurities doped in the grain will also affect the purity of the grain to be detected, affect the attenuation during the microwave radiation process, and reduce the moisture detection. precision

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