JPH0561579B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method and apparatus for measuring grain moisture, and in particular to a method and apparatus for measuring grain moisture, and in particular, measuring the electrical resistance of each grain,
The present invention relates to a grain moisture measuring method and device for measuring grain moisture.

[Description of Prior Art] Grain moisture measuring devices that measure the moisture content of grains by measuring the electrical resistance of the grains have been widely used. In other words, this device takes one sample from a grain, places it between a pair of opposing electrodes, passes an electric particle through it, obtains the resistance of the grain from the resulting voltage, and converts it to find the water content. This is what I did. In order to improve the accuracy of moisture measurement, the grains are preferably ground, and after being ground, they are placed between a pair of electrodes. When crushing,
A grinder having a pair of opposed grinding rollers is used. The grinding rollers are arranged adjacent to each other in parallel with a slight gap between them, and rotate in directions facing each other at different circumferential speeds. The grains are crushed by friction between opposing rollers (because the peripheral speeds differ depending on the gear ratio). A roller-electrode moisture measuring device is also currently in use in which these grinding rollers are provided in a grain moisture measuring device and used as electrodes, and a voltage is measured by passing a current through these grinding rollers. Such a roller is called an electrode roller.

When a current is applied to a grain while crushing it with an electrode roller and the voltage is measured, an output Vo showing a peak voltage as shown in A of FIG. 2 is obtained.

Now, a cleaning action is performed on the pair of roller electrodes after crushing a grain of grain, but when the remaining particles that could not be removed by this cleaning action circulate again, current is applied again and an output voltage is generated. . Such a voltage is usually instantaneous and has a low peak level, as shown in FIG. Therefore, when an output voltage as shown in FIG. 3 is obtained, it is not a signal indicating the moisture value of the grain, and therefore it is necessary to remove it as a noise signal. To this end, the voltage signal obtained during moisture measurement is compared with a noise signal to determine whether or not there is a valid measurement signal.

[Problems to be Solved by the Invention] When making a comparison, there are two cases: calculating the integral value of the noise signal for comparison and comparing this integral value with the integral value of the output voltage signal, and comparing the peak level of the noise signal for comparison. Two methods are used to compare the peak level of the output voltage signal and the peak level of the output voltage signal.

The former comparison based on integral values is influenced by the size of each grain. That is, if the peak level is the same, the larger the grain, the larger the integral value, and the smaller the grain, the smaller the integral value. Further, when comparing peak levels, depending on the water content, even if the measurement is correct, the peak level may be low and show a value close to that of the comparison noise signal. That is, there may be cases where a normal measurement voltage signal as shown in FIG. 4 is obtained.

Only by comparing the signals as described above, it is not possible to distinguish between a noise signal and a normal measurement signal with sufficient accuracy.

An object of the present invention is to solve the above-mentioned problems in the conventional electrical measurement of grains. Specifically, the present invention provides a means by which a normal measured voltage signal can be accurately distinguished from a noise signal.

[Means for Solving the Problem] In order to achieve the above objects, the present invention includes the steps of: measuring the voltage by passing a current through it while crushing one grain; and determining the peak level of the obtained voltage. integrating the voltage, comparing the peak level with a predetermined value, comparing the integrated value with the predetermined value, and determining the measured voltage value as a normal measurement signal when it is larger than both predetermined values; A method for measuring the moisture content of grain is provided, the method comprising the step of converting the normal measurement signal to determine the moisture content of the grain.

Furthermore, according to the present invention, the grains are fed one by one between a pair of crushing electrode rollers to be crushed, and at the same time, a current is applied to take out a voltage signal between the electrode rollers, and the voltage signal is based on the voltage signal. In a grain moisture measuring device that has come to measure the moisture content of grains, it includes a means for calculating the peak level of the voltage signal, a means for integrating the voltage signal to obtain the integral value, and a means for calculating the peak level of the voltage signal. It is connected to the level calculating means and the integrating means, and compares the peak level of the voltage signal and the integral value with a predetermined value, and when it is larger than the predetermined value, the voltage signal is regarded as a valid signal and an enabling signal is output. a control means connected to the control means, inputting the activation signal and passing the voltage signal, and a moisture content connected to the gate circuit converting the voltage signal into the moisture content of the grain; There is provided a grain moisture measuring device characterized by having a conversion circuit.

[Function] With the above-described configuration of the present invention, grains are successively introduced and crushed between the roller electrodes of the moisture measuring device to measure the moisture content. Even if crushed debris is stuck to the roller electrode and this generates a noise signal, this noise signal is nullified and only the normal measurement signal is converted into moisture content.

[Example] The present invention will be explained in detail in the form of an example with reference to the accompanying drawings.

FIG. 1 shows a block diagram of a grain moisture measuring device which is an embodiment of the present invention. Reference numerals 1a and 1b are roller electrodes arranged in parallel with a slight gap between them, during which grains are introduced one by one and crushed. Between these electrodes,
A potential is applied by the power supply, and when the ground grains come between them, a current is generated and a voltage Vo is generated as the output of the measuring circuit 2. This voltage Vo is used as a measurement signal by the peak level calculation circuit 5 and the integration circuit 6.
The peak level and integral value of each measurement signal are determined.

The control circuit 7 compares the obtained peak level and integral value with respective stored reference values,
If both are larger than the reference value, an enabling signal is output to the gate circuit 8. The above measurement signal is
Since the signal is also input to the gate circuit 8, when the gate is opened by the activation signal, the signal is input to the water content conversion circuit 9. Therefore, moisture content conversion circuit 9
converts the measurement signal into moisture content and transfers the result to the output display device 10.

With reference to FIG. 4, the processing after the time when the measured voltage value is obtained will be explained.

First, when a voltage Vo is generated, it is input as a voltage signal to the peak level calculating circuit 5 and the integrating circuit 6 in step 1, and the peak level Vo _nax and integral value SV are determined in step 2. These values are input to the control circuit 7, and the reference value is set in step 3.
Compare with VR and SVR. If both are larger than the reference value, the control circuit 6 outputs an enabling signal to the gate circuit 8 in step 4. For this purpose, the gate is opened and thus in step 5 the water content conversion circuit 9
is converted into moisture content from the above voltage signal, and step 6
It is displayed on the output display device 10. If the judgment condition in step 3 is not satisfied, the control circuit 6 does not generate a signal and returns to step 1 to maintain the input state of the next voltage signal.

[Effects] In the configuration of the present application, since both the peak level and the integral value of the input voltage signal are compared with respective reference values, it is possible to accurately distinguish whether the input voltage signal is a noise signal or a valid measurement signal. I can do it.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a grain moisture measuring device which is an embodiment of the present invention. FIGS. 2 to 4 are diagrams showing various measurement signal voltages. Figure 5 shows the first
The figure which shows the flowchart of the operation|movement of the grain moisture measuring device of FIG. 1a, 1b...Roller electrode that also serves as a crushing roller, 2...Moisture measuring circuit, 3...Power source, 4...Grain, 5...Peak level calculation circuit, 6...Integrator circuit, 7...Control circuit, 8...gate circuit, 9...
Moisture content conversion circuit, 10...display device.

Claims (1)

[Claims] 1. A step of passing a current through and measuring a voltage while crushing a grain of grain, a step of determining the peak level of the obtained voltage, a step of integrating the obtained voltage, and the steps of: comparing the peak level with a predetermined value, and comparing the integral value with a predetermined value, and determining the measured voltage value when it is larger than both predetermined values as a normal measurement signal; and converting the normal measurement signal into the A method for measuring the moisture content of grains, comprising the steps of determining the moisture content of grains. 2. Grain is fed one by one between a pair of crushing roll electrodes to crush it. At the same time, the sample current generated by the applied voltage is converted into a voltage signal, and based on the voltage signal, the grain is crushed. A grain moisture measuring device that has come to measure the moisture content of grains includes means for calculating the peak level of the voltage signal, means for integrating the voltage signal to obtain its integral value, the peak level calculation means, and the a control means connected to the integrating means, which compares the peak level of the voltage signal and the integrated value with a predetermined value, and when the voltage signal is greater than the predetermined value, considers the voltage signal to be a valid signal and outputs an enabling signal; , a gate means connected to the control means, inputting the enabling signal and passing the voltage signal; and a moisture content conversion circuit connected to the gate signal, converting the voltage signal into the moisture content of the grain. A grain moisture measuring device comprising: