SU387344A1 - DEVICE FOR CONTROL MOISTURE GRAIN - Google Patents

Description

one

The invention relates to devices for controlling the moisture of a grain in a drying chamber.

Devices for controlling and monitoring grain moisture are known, comprising a moisture sensor, a pulse generator, a computing unit, a reference element.

The aim of the invention is to improve the accuracy of the device.

This is achieved by the fact that a discrete differentiation unit is installed in it, one input of which is connected to the output of the humidity sensor, the second to the reference element. The other inputs of the discrete differentiation unit are connected to the output of the pulse generator, and the output of the reference element is connected to the computing unit.

The drawing shows a block diagram of the proposed device.

It contains a drying chamber /, a humidity sensor 2, a discrete differentiation unit 5 containing an electronic automatic potentiometer 4, two electronic automatic bridges 5 to 6, keys 7, 8 and 9, electric motors for testing 10, 11, 12 in all bridges, a pulse generator, the comparison element 13, the computing device 14, performing the functions of summing, storing and comparing information on a change in conductivity.

At the initial moment of time, the switch 7 is closed and during the time TI, the voltage of the humidity sensor 2 is converted into an angle of rotation of the engine 10, which moves the potentiometer slider until resistance G1 becomes proportional to the voltage of the humidity sensor. In this way, the voltage taken from the humidity sensor is remembered. During the next cycle of operation of the generator with a duration of T2, when the key 9 is closed, the resistance r is connected to the input of the electronic bridge 6 from the resistance RZ and the top of the resistance equal to Bx -Ri- (ri-yy).

The position of the slide motor Rz of the bridge Rz 5 - the resistance value rz - repeats the position of the slide rail R with a shift by one differentiation step. Therefore, by the ratio between the magnitudes of the resistances G1 and G9, we can judge the nature of the increment of the electrical conductivity of the grain. If one accepts changes in electrical conductivity during the DG cycle time equal to AY, then

u shg, A- O, g /-.j and R,

f var, A-f Oh, ha and f var, 1 0, g, / -J and

The output motor 12 of the electronic bridge 6 moves the RW Ri engine

  to compensate for the resistance of g. Thus, by the position of the slide motor Rs relative to its center, one can judge the sign of the increment of electrical conductivity. The incoming signal from reference element 12 has the following meanings:

00 Oh

,

at

at

00 0

with Af - 0.

Computational

the device remembers the sequence of transitions of the characters of the derivatives through zero, analyzes and issues commands to the actuators.

Subject invention

A device for monitoring grain moisture, comprising a moisture sensor, a pulse generator, a computing unit, a comparison element, characterized in that, in order to improve the accuracy of the device, a discrete differentiation unit is installed in it, one input of which is connected

the output of the humidity sensor, the second to the reference element, the other inputs of the discrete differentiation unit are connected to the output of the pulse generator, and the output of the comparison element is connected to the computing unit.