JPH0425637Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to a device that pinches and crushes a sample grain between a pair of electrodes to which a potential difference is applied, and measures the moisture content of the sample grain from the current signal flowing between them. .

BACKGROUND ART Conventionally, this type of grain moisture measuring device has been described in, for example, Japanese Utility Model Publication No. 41247/1983.
In this device, as shown in FIG. 3, a pair of electrode rolls 101, 101' are connected to a constant voltage power source 103 with a resistor 102 in series, and sample grains are placed between the pair of electrode rolls 101, 101'. When the two are sandwiched, the current signal flowing between them is detected by the resistor 1.
By detecting the voltage between the terminals of 02, the moisture content of the sample grain is measured. In addition, 104 in the figure is an operational amplifier, and the resistor 10
The voltage between the two terminals is amplified by this operational amplifier 104 and then output.

Problems that the invention aims to solve By the way, the sample grains extracted when measuring the moisture content of grains often contain immature grains, and the moisture content of immature grains is considerably higher than that of grains of sorted grain. Therefore, in order to obtain highly accurate moisture measurement results using the conventional grain moisture measurement device described above, it is necessary to check the immature grain contamination rate of the sample grain in advance and correct the moisture measurement value accordingly. Not only is this complicated, but it also requires multiple mechanisms and circuit configurations to perform this automatically.

In view of these conventional problems, the present invention has a simple structure, and regardless of the percentage of immature grains in the extracted sample grain, it is possible to always obtain moisture measurement results for only grain size. Therefore, it is an object of the present invention to provide a grain moisture measuring device that can perform measurements with extremely high accuracy.

Means for Solving the Problems The present invention has the following technical means for achieving its purpose.

In other words, the grain moisture measuring device according to the present invention is a device that pinches and crushes a sample grain between a pair of electrodes to which a potential difference is applied, and measures the moisture content of the sample grain from a current signal flowing between the pair of electrodes. a pressure detector that detects the pressure when crushing the sample grain between the electrodes, and a function that determines whether the sample grain is regular grain or immature grain based on the current signal flowing between the pair of electrodes and the pressure signal from the pressure detector; and a data control circuit having a function of outputting moisture data from the current signal for particle size adjustment only.

Operation The sample grain whose moisture content is to be measured is sandwiched between a pair of electrodes and crushed. During this process, a current flows between the pair of electrodes via the sample grain, and the current signal is detected. In addition, the pressure that the pair of electrodes receives during the process in which the sample grain is sandwiched between the pair of electrodes and crushed is detected by a pressure detector. Then, in the data control circuit, it is determined whether the sample grain is sized or immature based on the current signal and the pressure signal, and moisture data of the sample grain is output from the current signal for grading only.

When the sample grain is immature grain, the crushing pressure and electrical resistance are lower than when grains are sized, so the data control circuit determines whether the grain is sized or immature from the current signal and pressure signal as described above. It is possible to accurately determine whether

Example An embodiment of the present invention will be described with reference to the drawings.

In Figures 1 and 2, 1 and 1' are a pair of rolled electrodes, one of which is placed at a small distance from the other electrode 1' so that they do not touch each other. , one electrode 1 is supported so as to be freely displaceable and is connected to a stress gauge 2, which allows the pair of electrodes 1,
The pressure when the grains 1' pinch and crush the sample grains is detected as a pressure signal. A potential difference is applied between the pair of electrodes 1, 1' by a constant voltage power source 3, and the pair of electrodes 1, 1'
In the meantime, a current signal flowing through the sample grain is detected and outputted via an amplifier 4. The output of the amplifier 4 is input to the data control circuit 6 via the A/D converter 5, and the pressure signal detected by the stress gauge 2 is input to the data control circuit 6 via the strain amplifier 7 and the A/D converter 8. The input circuit is configured. The data control circuit 6 is a microcomputer, and the data control circuit 6 determines whether the sample grain is sized or immature from the above-mentioned current signal and pressure signal, and calculates the moisture value of the sample grain from the current signal for grading only. This is what is output. Therefore, the data control circuit 6 is programmed with statistical data for determining whether the sample grain is a regular grain or an immature grain. is as shown in FIG. 2, and since immature grains have a lower electrical resistance to pressure than regular grains, this data can be programmed.

In the apparatus configured as described above, when the sample grain is supplied between the pair of electrodes 1 and 1', it is pinched and crushed between the pair of electrodes 1 and 1'. Since a potential difference is applied between 1' and 1' by the constant voltage power supply 3, a current flows through the sample grain, and a current signal is detected. At this time, the stress gauge 2 detects the pressure that crushes the sample grain through one electrode 1. Based on this current signal and pressure signal, the data control circuit 6 discriminates between grain size and immature grain, and outputs the moisture value of the sample grain from the current signal for grain size only.

In addition, if the data control circuit 6 averages a plurality of current signals for grain size adjustment and outputs the result as a moisture value, a more accurate measurement result can be obtained.

Effects of the invention As described above, the present invention is applicable to an apparatus in which a sample grain is sandwiched and crushed between a pair of electrodes to which a potential difference is applied, and the moisture content of the sample grain is measured from a current signal flowing between the two. A pressure detector that detects the pressure when crushing the grain, a function that determines whether the sample grain is grained or immature based on the current signal flowing between the pair of electrodes and the pressure signal from the pressure detector, and a function that determines whether the sample grain is grain size or immature grain, and grain size only. Since it is configured with a data control circuit that has a function of outputting moisture data from the above-mentioned current signal of You can do it, you can do it,
This has the effect of allowing highly accurate moisture measurement.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a device showing an embodiment of the present invention, FIG. 2 is a diagram for explaining the operation of the same, and FIG. 3 is a circuit diagram showing a conventional example. 1, 1...Pair of electrodes, 2...Stress gauge, 3
... Constant voltage power supply, 4 ... Amplifier, 5 ... A/D converter, 6 ... Data control circuit, 7 ... Strain amplifier, 8 ... A/D converter.

Claims (1)

[Claims for Utility Model Registration] (1) In a device that measures the moisture content of a sample grain from a current signal flowing between a pair of electrodes that apply a potential difference by sandwiching and crushing the sample grain between the pair of electrodes, A pressure detector that detects the pressure when crushing the grain, a function that determines whether the sample grain is grained or immature based on the current signal flowing between the pair of electrodes and the pressure signal from the pressure detector, and a function that determines whether the sample grain is grain size or immature grain, and A grain moisture measuring device comprising a data control circuit having a function of outputting moisture data from the current signal. (2) The grain moisture measuring device according to claim 1, wherein the data control circuit outputs a value obtained by averaging a plurality of moisture data obtained only from grain sorting.