JPH035509B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Technical Field The present invention provides an immature rice discrimination device for a grain dryer that measures the state of immature rice contained in paddy in order to appropriately set drying conditions during grain drying. Regarding.

(b) Prior Art In conventional grain dryers, the overall moisture content of the paddy in the storage tank is measured to set the drying conditions, and the drying rate or hot air temperature is controlled based on the moisture content data. I was doing it. However, the paddy dried in the grain dryer is then passed through a rice sorter to remove immature rice with high moisture content, waste rice, etc., and is sorted into grains. The moisture content is lower than the moisture content at the end of drying, which has the disadvantage of often resulting in overdrying.

(c) Purpose of the invention This invention was made in view of the above, and it automatically detects the content of immature rice, which is normally removed in a rice sorting machine, during the drying process in a grain dryer, and it An object of the present invention is to provide an immature rice discriminating device for a grain dryer, which can provide information on the content rate of immature rice to a drying control unit so that the rice is properly dried.

(d) Structure of the Invention In summary, this invention consists of two roll-type electrodes that are in opposing contact with each other, and rice grains are continuously dropped between the roll-type electrodes, thereby determining the moisture content of each grain. By installing a moisture meter that continuously measures moisture content, it is possible to obtain moisture content data continuously, and furthermore, by determining the dispersion from the data group, the number of data with high moisture content exceeding a predetermined deviation range is determined.
The immature rice content rate is calculated from the ratio of the number of data to the total number of sample data.

(e) Embodiment FIG. 1 is a block diagram of an immature rice discriminating apparatus which is an embodiment of the present invention. In the figure, reference numeral 1 denotes a moisture meter, and as shown in FIG.
It includes an inter-electrode voltage drop detection circuit 12 that detects the voltage drop between one electrode and a conversion circuit 13 that converts the voltage drop ΔV into a moisture content analog signal. In Figure 2, normal paddy 2 usually has a relatively low moisture content compared to immature rice 3, so the roll electrode 1
When the rice 2 enters between 0 and 11, the output voltage V at that time is
The output voltage is relatively smaller than that when the output voltage is held between the two terminals. Therefore, the output of the conversion circuit 13 is an analog signal having a different level when the paddy 2 is sandwiched between the rolled electrodes 10 and 11 and when the immature rice 3 is sandwiched between the roller electrodes 10 and 11. FIG. 3 is a diagram showing the fluctuation state of the output of the conversion circuit 13 when the moisture meter 1 is continuously driven. In the figure, a portion indicated by A indicates that immature rice 3 with a high moisture content is held between the roll electrodes 10 and 11.

The moisture content signal output from the moisture meter 1 is digitized by the A/D converter 4 and guided to the CPU 5.
The CPU 5 samples the continuously inputted moisture content data for a certain period of time or a certain number of times, and calculates the variation in the sampled amount. Further, a deviation range is determined based on the calculated variation, and the number of data with high moisture content exceeding the deviation range is regarded as corresponding to immature rice, and the immature rice content rate is calculated. In addition, CPU5
A ROM 6 that defines programs for performing the above operations and a RAM 7 to which work registers and the like necessary for data processing are allocated are connected by a bus. Next, with reference to FIG. 4, the operating procedure for calculating the immature rice content by driving the moisture meter 1 will be explained.

First, the moisture meter 1 is driven at step n1 (hereinafter, step ni is simply referred to as ni). The moisture meter 1 is driven by turning on a motor drive section 8 connected to the rotating shafts of the roll electrodes 10 and 11. When the drive unit 8 is turned on, the drive shafts 8a and 8b are driven to rotate counterclockwise and clockwise, respectively, and the rolled electrodes 10 and 11 also begin to rotate counterclockwise and clockwise accordingly. Then, with n2
A counter N assigned to the RAM 7 is preset to 1, and one sample of moisture content data output from the A/D converter 4 is obtained at n3. Then, it is determined which range the size of the sampled data falls into among a plurality of ranges classified in advance according to a certain size (n4). Once the sample data is divided, the counter is further incremented at n5 and n6, and data sampling and sample data division are performed until n=200.
Note that we try to sample until n = 200, that is, a total of 200 pieces of data, but the number of samples may be greater than this, or all the data input to the CPU within a predetermined time can be sampled. You may also do so. Figure 5 shows histograms obtained by sampling a total of 200 data up to n6 as described above. Figure A shows a case where there is almost no immature rice, and Figure B shows a case where there is a relatively large amount of immature rice. Each case is shown below.

For n7 and n10, the total sampled up to n6
Find the variation in the 200 pieces of data and calculate the content of immature rice from that variation. First, the variance σ ² is calculated using n7, and then the deviation σ/n is set. n
is an integer set experimentally in advance, and data with a high moisture content exceeding this deviation range σ/n is data corresponding to immature rice. For example, in FIG. 5A, data p1 and p2 are considered to be data corresponding to immature rice, and in FIG. 5B, data p3 to p5 are considered to be data corresponding to immature rice. Then, the number of data (number of samples) NA of high water content exceeding the deviation width σ/n is calculated (n9). In Figure 5A, NA = p1 + p2, in Figure 5B, NA
= p3 + p4 + p5. Once the total data number NA corresponding to immature rice is calculated, the operation of (NA/N)×100 is executed at n10 to calculate the immature rice content rate a% and the process ends. After driving the moisture meter 1 as described above, the content of immature rice can be automatically calculated.

When the content rate of immature rice is calculated as described above, the measured moisture content at the time of grain drying can be corrected based on the magnitude of the content rate. For example, if the immature rice content rate is 10%, the value obtained by subtracting the moisture content of approximately 0.2 to 0.4% from the measured moisture content at that time is considered to be the moisture content, and the immature rice content rate is 30%.
%, the moisture content at that time is 1~
If the value obtained by subtracting 1.2% is treated as the true moisture content, appropriate drying control can be performed for paddy excluding immature rice. Also, in Figure 5, p1~
If the average moisture content is calculated from the data in the range from which p5 data has been removed, and this moisture content data is used for drying control, it is possible to perform appropriate drying control for paddy, excluding immature rice, in the same way as above. In addition, when it is determined that the immature rice content is high and the moisture content is 0.5 to 1.0% higher than the moisture content at which the drying process is stopped, drying is automatically paused for a certain period of time, and grading and grading are carried out within that pause time. Reduce the moisture difference with immature rice,
After that, drying may be performed again. In this way, when drying has stopped for a certain period of time, the fifth
The number of data items in the range p3 to p5 shown in FIG. 5 is reduced as shown in FIG. 5A.

By obtaining the content of immature rice in this way, it becomes possible to easily correct the actually measured moisture content and control the tempering during drying.

(f) Effects of the Invention As described above, according to the present invention, since the immature rice content rate can be automatically measured when the moisture meter is driven, it is possible to automatically measure the immature rice content rate by using the immature rice content rate data. Therefore, it is possible to easily correct the measured moisture content or perform tempering control, thereby preventing overdrying. Furthermore, data on the moisture content of each individual paddy can be obtained continuously by simply dropping the paddy in the storage tank between two roll-type electrodes, which has the advantage of making data sampling very simple.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an immature rice discriminator that is an embodiment of the present invention, Fig. 2 is a structural diagram of the roll-type electrode part of the moisture meter, and Fig. 3 shows an example of the output signal transition state of the moisture meter 1. Figure 4 is a flowchart showing the operation of the above-mentioned immature rice discriminating device, and Figures 5A and B are diagrams showing histograms of the number of data with respect to moisture content when there is almost no immature rice and when there is a large amount of immature rice, respectively. be. 1... Moisture meter, 10, 11... Roll type electrode,
2...Paddy (sized), 3...Immature rice, 4...A/D
converter.

Claims (1)

[Claims] 1 Moisture meter that continuously measures the moisture content of each individual paddy by bringing two roll-type electrodes into opposing contact and dropping the paddy between the roll-type electrodes, and A that digitizes the output of this moisture meter. /D converter,
A variation calculation means that samples digitized moisture content data for a certain period of time or a certain number of samples and calculates the variation, and a variation calculation means that calculates the variation of the digitalized moisture content data, and calculates the deviation range of a preset rate based on the calculated variation, and also calculates the deviation range of the high water content exceeding the deviation range. Immature rice content rate calculation means for calculating the number of data and calculating the ratio of the number of data to the total number of sample data as the immature rice content rate;
A device for determining immature rice in a grain dryer.