On-line measurement digital sensing device for grain depot foodstuffs temperature and moisture

Abstract

The invention relates to the grain bin grain temperature and moisture detection field, in particular to a digital sensing device for carrying out on-line grain temperature and moisture measurement in a grain bin. The sensing device solves the problem that the prior grain situation measuring and controlling system can not simultaneously carry out the accurate on-line grain temperature and moisture measurement; the device comprises a tensile wirerope, a plurality of grain temperature and moisture sensors which are fixed along the tensile wirerope and connected in parallel with each other and a plastic cladding externally wrapped on the tensile wirerope and the grain temperature and moisture sensors; the digital signal transmission lines of all the grain temperature and moisture sensors are connected with each other. Each grain temperature and moisture sensor comprises a hard plastic tube with an in-built thermistance and a metal cylinder respectively sleeved and fixed on two ends of the hard plastic tube to form a detecting capacitor; the hard plastic tube is provided with a measuring circuit inside for measuring the variable quantity of the detecting capacitor and the thermistance. The digital sensing device has reasonable structure and low manufacturing cost, adopts a digital transmission mode and can carry out the accurate on-line grain temperature and moisture measurement in the grain bin.

Description

technical field [0001] The invention relates to the field of grain temperature and moisture detection in grain depots, in particular to a digital sensing device for online measurement of grain temperature and moisture in grain depots. Background technique [0002] Whether it is in the daily storage of grain depots, or in the cooling ventilation, precipitation ventilation, and tempering ventilation of grain, online measurement of grain temperature and moisture is essential. Online measurement requires that the horizontal spacing of monitoring points is less than 5 meters, and the vertical spacing is less than 2 meters; the smaller the repeated error of the measured grain temperature and moisture, the better. The temperature repeated error should preferably be less than or equal to 0.1 degrees Celsius, and the moisture repeated error should preferably be less than or equal to 0.02%. , so that as long as there is a slight change in the state of the food in storage, it can be mo...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the existing grain condition measurement and control system applied to the grain depot cannot accurately measure the temperature and moisture of

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