JPH07102328B2 - Removal rate detector for hulling machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an improvement of a removal rate detection device which is provided in a hulling machine and which checks the removal rate of mixed rice that has been subjected to derolling by derolling.

(Prior Art) Conventionally, as an apparatus of this type, light is applied to each grain of the mixed rice of paddy and brown rice after de-rolling, and the electric power is adjusted according to the state of transmission or reflection of the light. It is known that the output is compared with the discriminant value between paddy and brown rice, and the number of paddy and brown rice is counted from the comparison result to obtain the loss rate.

(Problems to be solved by the invention) By the way, there is immature rice in the mixed rice after detreatment,
Since this unripe rice has been detreated, it should be counted as brown rice, but it is often counted as paddy because the amount of light reflected or transmitted is smaller than that of brown rice.

Therefore, in the past, if the mixing ratio of unripe rice was high, there was a drawback that a precise removal ratio could not be obtained.

Then, this invention aims at eliminating such a fault.

(Means for Solving Problems) In order to achieve this object, the present invention has the following configuration.

That is, the present invention provides a sensor 2 for detecting the rate of desorption that irradiates the mixed rice that has been detreated by derolling with light to convert the state of desorption into an amount of electricity, and detects rice and brown rice from the detection values of the sensor 2. Paddy / brown rice discriminant value calculation means A for determining a discriminant value, immature rice detection area setting means B for setting an unripe rice detection area having a predetermined width above and below the determined discriminant value, and each of the sensors. An unripe rice mixing ratio calculating means C for calculating the number of undetected rice corresponding to the unripe rice detection region and calculating the unmixed rice mixing ratio from the number, and when the calculated unripe rice mixing ratio exceeds a predetermined value. , A discriminant value correcting means D for correcting the paddy / brown rice discriminant value to obtain a corrected discriminant value, and each detected value of the sensor is compared with the obtained corrected discriminant value, and a loss rate is detected from the comparison result. And rate detection means E.

(Operation) When dehulling of paddy is started by the derolling roll 3 of the huller, the deblended mixed rice of unhulled rice and brown rice is guided to the degrading rate detection sensor 2 one by one, and The released state is converted into an electric quantity.

The paddy / brown rice discriminant value calculation means A obtains a discriminant value for discriminating between paddy and brown rice from the detection value of the sensor 2, and the unripe rice detection area setting means B moves up and down around the discriminant value thus obtained. An immature light detection region having a predetermined width is set to.

Next, the unripe rice mixing rate calculation means C obtains the number of detection values of the sensor 2 that correspond to the set unripe rice detection region, and calculates the unripe rice contamination rate from the obtained number. Then, when the calculated unripe rice mixing ratio is high, the discriminant value correction means D corrects the discriminant value obtained by the paddy / brown rice discriminant value calculating means A.

The escape rate detecting means E compares each detection value of the sensor 2 with the correction determination value, and detects the escape rate from the comparison result.

Therefore, even when the unmixed rice content is high,
The detection loss rate is a highly accurate value.

(Embodiment) FIG. 2 is a block diagram of a hulling machine to which an embodiment of the present invention is applied, and the drawing shows only a portion relating to the present invention.

In the figure, reference numeral 1 is a one-chip type microcomputer, which comprises a central processing unit (CPU), a random access memory (RAM), and a read only memory (ROM). The RAM stores various data, and the ROM stores a control procedure for controlling each component as shown in FIG. 3, for example.

2 is a de-detection sensor for shining light on each grain of the mixed rice of unhulled rice and brown rice after de-treatment by the de-rolling 3 of the huller, and obtaining an electrical output according to the reflection or transmission of the light, Paddy and brown rice are discriminated from each other according to the magnitude of the electric output as described later.

Reference numeral 4 is an A / D converter, and 5 is a removal rate setting means for setting a reference removal rate during the removal rate control. 6 is the derolling 3, so that the removal rate set by the removal rate setting means 5 is obtained.
It is a derolling opening / closing motor that adjusts the gap of 3.

Next, an operation example of the embodiment of the present invention configured as described above will be described with reference to FIGS. 3 and 4.

When dehulling of paddy is started by derolling of a hulling machine, the deblended mixed rice of unpolished rice and brown rice is led to the degrading rate detection sensor 2 one by one, depending on the debonding state. An electrical output is obtained, and this output is A / D converted by the A / D converter 4 and read into the microcomputer 1, and such processing is performed for, for example, 400 grains (step S1).

Then, for every 400 grains, 100 grains are set as one unit, and the average of each highest value in the unit is obtained as the paddy voltage E1, for example, and the average of each lowest value in the unit is obtained as the brown rice voltage E2, for example. (Steps S2, S3). Then, the paddy / brown rice discrimination voltage E is obtained from these voltages E1 and E2 by the following equation (1) (step S4).

E = (E1−E2) α + E2 (1) where α is a multiplication rate of about 0.53.

Next, centering on the paddy / brown rice discrimination voltage E thus obtained, an unripe rice detection region d having a predetermined width is set up and down as shown in FIG. 4 (step S5).

Next, it is checked whether or not the detection value of the loss rate detection sensor 2 includes the unripe rice detection region d set as described above, and when it is included, this is regarded as unripe rice and counted. Then, the mixing rate of immature rice is calculated from the count value (step S6). For example, if the detected grain number is "100" and the unripe rice count value is "5", the unripe rice contamination rate is 5%.

Next, it is determined whether or not the unripe rice mixing ratio is larger than a predetermined value such as 5% (step S). When it is larger than the predetermined value, the paddy / brown rice discrimination voltage E obtained in step S4 is set to a predetermined amount. Increase and correct (step S8). In this case, a predetermined voltage (for example, 0.5V) may be increased, or the multiplication factor α in the equation (1) may be set to 0.6 to obtain the correction value.

On the other hand, when the unripe rice mixing rate is smaller than the predetermined value, the paddy / brown rice discrimination voltage E obtained in step S4 is uncorrected (step S9).

Next, the processing is performed as described above, and the loss rate is calculated as follows based on the correction voltage. That is, each detected value of the sensor 2 for detecting the removal rate is compared with the correction voltage value obtained as described above, and when the detected value exceeds the corrected voltage value, for example, it is counted as paddy, while the detected value is, for example, the corrected value. When it exceeds the voltage value, it is counted as brown rice, and the loss rate is calculated from each of these count values.

Then, the derolling opening / closing motor 6 rotates normally or reversely so that the delaminating ratio calculated in this way matches the delaminating ratio set by the delaminating ratio setting means 5, whereby the derolling 3, 3 is performed.
Adjust the gap of.

(Effect of the invention) As described above, in the present invention, the discriminant value for discriminating between unhulled rice and brown rice is corrected to a predetermined value when the mixing ratio of immature rice is high, and the determination value is corrected based on this corrected discriminant value. Since the rate is calculated, even if the mixing rate of the unripe rice is high, the removal rate with high accuracy can be obtained, and thus the accuracy of the derolling control can be improved.

[Brief description of drawings]

FIG. 1 is a functional diagram of the present invention, FIG. 2 is a block diagram of a grain huller to which the embodiment of the present invention is applied, FIG. 3 is a flowchart explaining an operation example of the embodiment of the present invention, and FIG. It is a figure which shows the detection waveform example of a detection sensor. Reference numeral 1 is a microcomputer, 2 is a sensor for detecting a loss rate, A is a paddy / brown rice discrimination value calculation means, B is an unripe rice detection area setting means, C is an unripe rice mixing rate calculation means, D is a discrimination value correction means, and E Is a removal rate detection means.

Claims (1)

[Claims] 1. A sensor for detecting a rate of de-rolling, which converts light into a quantity of electricity by irradiating the mixed rice after de-rolling with light, and a discrimination for discriminating between paddy and brown rice from the detection value of the sensor. Paddy / brown rice discriminant value calculation means for obtaining a value, unripe rice detection area setting means for setting an unripe rice detection area having a predetermined width around the obtained discriminant value, and among the detection values of the sensor, An unripe rice admixture ratio calculating means for calculating the number of unripe rice in the unripe rice detection area and calculating the unripe rice admixture ratio from the number, and when the calculated unripe rice admixture ratio exceeds a predetermined value, the rice / brown rice discrimination A paddy value correction unit that corrects a value to obtain a correction discriminant value, and a loss rate detection unit that compares each detection value of the sensor with the obtained correction determination value and detects a loss rate from the comparison result. Removal rate detection device for a sliding machine.