JPH0439905B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention involves sandwiching one sample grain between a pair of electrodes, detecting the electrical resistance of each sample grain, and determining the moisture content of the grain from the average electrical resistance. This invention relates to a method and device for measuring moisture in grains.

BACKGROUND ART Conventionally, there is a grain moisture measuring device of this type described in, for example, Japanese Patent Publication No. 44286/1986, which will be explained with reference to FIG. 1,1'
are a pair of electrode rolls, and the pair of electrode rolls 1 and 1' face each other with an interval suitable for sandwiching one sample grain 2, and rotate in the direction of the arrow. be. Then, when one grain of sample grain 2 is sandwiched between the pair of electrode rolls 1, 1', the moisture content of one grain of sample grain 2 is measured from the electrical resistance between the pair of electrode rolls 1, 1'. It's getting old.

Problems to be Solved by the Invention In general, harvested and threshed grains contain a considerable amount of immature and watery grains, so-called green grains.

By the way, in order to measure the moisture content of grains, as mentioned above, the sample grains are taken out one by one, the moisture content of each grain is detected, and the average moisture value of each detected time is calculated. When the grains are removed, the measured average moisture value appears to be greater than the actual moisture value, which has traditionally been a cause of poor measurement accuracy.

Therefore, when using a grain moisture measurement method that extracts sample grains one by one, detects each moisture value, and averages the values, removing the influence of blue grains improves the accuracy of grain moisture measurement. This is extremely important for achieving this goal.

Means for Solving the Problems The present invention relates to a method and apparatus for solving the above problems, the details of which will be explained below.

The grain moisture measuring method according to the present invention involves sandwiching one sample grain between a pair of electrodes, detecting the electrical resistance of each sample grain, and measuring the grain moisture from the averaged electrical resistance. , a change in the gap between the pair of electrodes is detected when one sample grain is sandwiched between the pair of electrodes. When this gap change is smaller than a predetermined magnitude, the detected electrical resistance data is ignored, or data processing is performed to reduce its influence on the average value of the electrical resistance data. Determine the average moisture value and moisture distribution value.

In addition, as shown in FIGS. 1 and 2 corresponding to the embodiment, the apparatus for carrying out the method for measuring the moisture content of grains includes sandwiching one grain of sample grain 118 between a pair of electrodes 101 and 101'. Each sample grain 118
In the apparatus for measuring the moisture content of grain from the average electrical resistance by detecting the electrical resistance of each electrode, one electrode 101 of the pair of electrodes 101, 101'
The structure is such that it is movable and elastically supported. When the pair of electrodes 101 and 101' sandwich one sample grain 118, the displaceable electrode 101
A gap detector 106 is provided to detect a change in the gap between the electrodes from the amount of displacement of the electrode, and a memory circuit 115 is provided to store the electric resistance and the change in the gap between the electrodes for each measurement. Furthermore, it includes a data processing circuit 116 and a moisture value calculation circuit 117, and the data processing circuit 116 calculates and sets a gap value between the electrodes for data processing from a storage memory, and the gap between the electrodes is smaller than the set value. In this case, the detected electrical resistance data is ignored, or processing is performed to reduce the degree of influence on the average value of the electrical resistance data. The average moisture value and moisture distribution value are calculated based on the processed data.

Function In the apparatus according to the present invention, when measuring the moisture content of grains, the sample grains 118 are sandwiched and pressed one by one between the pair of electrodes 101, 101'. The electrical resistance of one sample grain 118 is detected between the electrodes 101 and 101',
Also, a gap change between the electrodes is detected from the amount of displacement of one electrode 101 of the pair of electrodes 101, 101'. Then, the electrical resistance of each sample grain and the gap change between the electrodes are determined by the memory circuit 1.
15, and the data processing circuit 116 ignores the electrical resistance data when the gap change between the electrodes is smaller than a preset value, or reduces the influence when averaging the electrical resistance data. will be held. Next, the electrical resistance of each grain processed in this way is calculated by the moisture value calculation circuit 1.
17, and the average moisture value and moisture distribution value are calculated.

Embodiment A first embodiment of the method and apparatus according to the present invention will be described below.
4 through 4 will be explained.

FIG. 1 shows the detection section of the grain moisture measuring device, in which 101 and 101' are a pair of electrodes made of rotating rolls, one of which is electrode 101.
are supported so as to be freely displaceable by t' in a direction away from each other from a small distance t position where they do not contact each other with respect to the other electrode 101' provided at a fixed position. The displaceable electrode 101 is elastically supported by a compression spring 102 in a direction toward the electrode 101' on the home position side. 103 is a displacement boss of the freely displaceable electrode 101; 104 is its support; 105 is a support member for the compression spring 102; It is linked to the container 106. That is, the gap detector 106 is composed of a high frequency differential transformer, and the displacement boss 103 is in contact with a slide core 107, which is pressed against the displacement boss 103 by a weak spring 108. . The differential transformer includes a primary coil 109 and a secondary coil 110. A pair of electrodes 101,1
01' are interlocked to rotate in opposite directions as shown by arrows by a gear structure or the like.

FIG. 2 shows an example of a measuring device using a detection section configured as described above, in which 111 is a resistance conversion circuit, 112 is a gap conversion circuit, and 113 is a temperature conversion circuit. The electrical resistance of one sample grain sandwiched between a pair of electrodes 101 and 101' is detected, and a gap conversion circuit 112
receives the signal from the gap detector 106 and detects the gap change between the electrodes, and further detects the gap change between the electrodes.
Reference numeral 3 receives a signal from the temperature sensor 114, detects the grain temperature, and converts it into a signal input to the memory circuit 115, respectively. Memory circuit 115
Data such as electrical resistance detection data, gap change between electrodes, and grain temperature detected from each sample grain are collected and stored. Further, 116 is a data processing circuit, and 117 is a moisture value calculation circuit, which calculates from the storage memory inputted from the memory path 115 to the data processing circuit 116, and calculates the moisture value in the moisture value calculation circuit 117 based on the data processed. An average moisture value is calculated. That is, in the data processing circuit 116, when the gap change between the electrodes when one grain of sample grain 118 is sandwiched between the pair of electrodes 101, 101' is smaller than a preset value, the detected electrical resistance is Data processing is performed to ignore the data or reduce its influence when calculating the average moisture value.
In this embodiment, when the gap change between the electrodes is smaller than the above set value, data processing is performed such that the degree of influence on the average moisture value is set to 0.5.

Note that the gap change value between the electrodes set in advance as described above is a value that is recognized as optimal based on experience, but these may also be determined by calculating the standard deviation from the average value of the results of multiple measurements. Furthermore, when the gap between the electrodes is quite large, the grain size of the sample grain is large, so the degree of influence on the average moisture value is increased, and measurement accuracy can be further improved. In this embodiment, the degree of influence is set to 2.

Next, the operation of the data processing circuit 116 will be explained in more detail with reference to FIGS. 3 and 4.

One sample grain is placed between a pair of electrodes 101 and 101'.
When the particles are supplied one by one and the electrical resistance is detected many times, the relationship between the gap change value between the electrodes and the frequency of taking the same value exhibits the curve shown in FIG.
Therefore, if the center point of the gap change value of the electrode and its magnitude limit points are S _H and S _L , respectively, then
From the standard deviation SS of the gap change value, S _L = -SS S _H = +SS.

Then, the detected gap change value between the electrodes is
If S _t , the data processing circuit 116 makes the determination shown in FIG.

That is, first, it is determined whether the gap value S _t between the electrodes is smaller than the lower limit point S _L , and if so, the electrical resistance data Mi of the relevant measurement time is
is set so that the degree of influence P on the average moisture value is 0.5. However, when this judgment of Si<S _L is negative, it is further judged whether the gap value Si between the electrodes is larger than the upper limit point S _H , and if so, the electric resistance data Mi is The degree of influence Q on the moisture value is set to 2. However, when this judgment of Si>S _H is negative, the electrical resistance data Mi is assumed to be intermediate between the lower limit point S _L and the upper limit point S _H.
The degree of influence R on the average moisture value is set to 1.

Based on the above results, the moisture value calculation circuit 117 calculates the average moisture value=ΣMi×P+ΣMi×Q+ΣMi×R/AP+BQ+
The CR calculation is performed and the average moisture value is calculated. Note that A, B, and C are the numbers of sample grains, and the total number is the number of measurements N (A+B+C=
N).

As is clear from the above operation details, even if a single grain of blue grain, which has a small grain shape and contains a lot of moisture, is supplied as a grain of sample grain, its influence on the average moisture value P is small, so the calculated average It is possible to measure the moisture content of grains with high accuracy without increasing the error in the moisture value, and to obtain the moisture distribution value.

The green grains are removed as immature grains during hulling after drying.

Effects of the Invention In summary, since the present invention is the method and apparatus as described above, even if it is a grain moisture measuring means that takes out sample grains one by one, detects the moisture value of each grain, and averages it, It is possible to remove the influence caused by the large amount of green grains contained in the grains, resulting in the effect of significantly improving the accuracy of grain moisture measurement.

[Brief explanation of drawings]

The drawings show an embodiment of the grain moisture measuring device according to the present invention, in which FIG. 1 is a schematic front view showing the detection section of the device, FIG. 2 is a block diagram showing the configuration of the device, and FIG. FIG. 3 is a diagram showing the relationship between the magnitude of the gap change value between the electrodes and the frequency, FIG. 4 is a flowchart showing the operation mode of the data processing circuit, and FIG. 5 is a conventional explanatory diagram. 101, 101'...pair of electrodes, 106...
Gap detector, 111...Resistance conversion circuit, 11
2...Gap conversion circuit, 115...Memory circuit, 116...Data processing circuit, 117...Moisture value calculation circuit, 118...One sample grain.

Claims (1)

[Claims] 1. In a method of sandwiching one grain of sample grain between a pair of electrodes, detecting the electrical resistance of each sample grain, and measuring the moisture content of the grain from the average electrical resistance, the above-mentioned pair of electrodes Detects the gap change between the electrodes when one sample grain is sandwiched between the electrodes, and ignores the detected electrical resistance data when the gap change is smaller than a predetermined size, or calculates the average of the electrical resistance data. A grain moisture measuring method characterized by calculating an average moisture value and a moisture distribution value by performing data processing to reduce the degree of influence on the values. 2 In a device that sandwiches one grain of sample grain between a pair of electrodes, detects the electrical resistance of each sample grain, and measures the moisture content of the grain from the average electrical resistance, a pair of electrodes is elastically supported with one electrode movable. a gap detector that detects a change in the gap between the electrodes from the amount of displacement of the displaceable electrode when a pair of electrodes sandwich one sample grain; A memory circuit that stores the gap change of , and a gap value between the electrodes that performs data processing is calculated and set from the memory memory, and when the gap between the electrodes is smaller than the set value, the detected electrical resistance data is ignored, or a data processing circuit that reduces the degree of influence on the average value of electrical resistance data, and a moisture value calculation circuit that calculates the average moisture value and moisture distribution value based on the data processed by the data processing circuit. A grain moisture measuring device characterized by: