JPH0531383A - Dehulling rate detector of huller - Google Patents

Abstract

PURPOSE:To enhance the discrimination accuracy of rice hulls and unpolished rice and the detection accuracy of a dehulling rate by calculating the frequency distribution of detection values using a returned rice sample high in rice hull content and calculating a rice hull and unpolished rice discrimination value from said frequency distribution. CONSTITUTION:A hulled rice sample A is supplied to a dehulling rate sensor 2 and the quantity of light of a light emitting element is controlled. That is, the voltage corresponding to the quantity of emitted light at the time of the passage of the n-grain sample A is inputted to a controller to calculate frequency distribution. Then, the voltage bringing the frequency distribution to the max. frequency is allowed to coincide with preset unpolished rice voltage. Next, a returned rice sample B is supplied to the dehulling rate sensor to calculate rice hull voltage. Predetermined operation is performed on the basis of the unpolished rice voltage and rice hull voltage to calculate rice hull and unpolished rice discriminating voltage for discriminating rice hulls and unpolished rice. Thereafter, the dehulling rate of the hulled rice sample A is detected to be compared with the rice hull and unpolished rice discriminating voltage, and it is judged whether the sample is rice hulls or unpolished rice to calculate a dehulling rate. From this result, an objective sample is detected.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a removal rate detecting device used in a hulling machine. 2. Description of the Related Art A conventional dehulling rate detecting device used for dehulling roll gap control or the like in a hulling machine performs the following processing. That is, when the skimmed rice that has been subjected to the depulling treatment is sampled by a deploping roll and the sample is supplied to the depuffing rate sensor, the depuffing rate sensor responds to the optical characteristics (eg, light transmittance) of the sample. The voltage is obtained. When such a voltage is input to the CPU for n samples, C
The PU creates a frequency distribution of the voltage of the sample n particles. Here, due to the difference in the optical characteristics of paddy and brown rice, the peak of brown rice and the peak of paddy appear separately in this frequency distribution. Therefore, a predetermined calculation is performed based on both voltage values showing these two peaks. , The paddy brown rice discriminating value for discriminating between paddy rice and brown rice is obtained, the paddy rice and the brown rice are discriminated based on the discriminating value of the paddy brown rice, and the content rate of brown rice in the extruded rice (that is, the removal rate) is calculated. is there. [0003] However, when the frequency distribution is obtained by using the surplus rice in the removing section, 85-90% of the surplus rice is brown rice and the content of paddy is included. Since the amount is small, the paddy peak may not appear clearly on the frequency distribution.In such a case, the paddy brown rice discriminating voltage cannot be calculated properly, which is an obstacle to the improvement of the removal rate detection accuracy. It was Therefore, an object of the present invention is to optimize the paddy brown rice discriminating voltage so as to improve the accuracy of detecting the removal rate. [0005] In order to solve the above problems, the removal rate detection device of the present invention is a reduced rice sample processed in the removal section and reduced rice reduced by the sorting section. The selection means for selectively supplying either one of the samples, the optical sensor for optically detecting the properties of the supplied sample, and the frequency distribution of the detection values of the n-grain reduced rice sample detected by the optical sensor are shown. Frequency distribution creating means to create, based on the frequency distribution created by the frequency distribution creating means, a discriminant value calculating means for calculating a paddy brown rice discriminant value for discriminating between paddy and brown rice, and a detection value of the optical sensor To the paddy brown rice discriminant value calculated by the discriminant value calculating means to discriminate whether the sample is paddy or unpolished rice, and detect the shedding rate of the sample based on the discriminant result of the discriminant means. Remove rate detection hand It is characterized by having steps. [0006] When one of the extruded rice sample and the reduced rice sample is supplied by the selection of the selecting means, the optical sensor optically detects the property of the supplied sample. The frequency distribution creating means creates a frequency distribution of the detection values of the n-grain reduced rice sample detected by the optical sensor. The discriminant value calculating means calculates a discriminant value of paddy brown rice for discriminating between paddy and brown rice based on the created frequency distribution. The determination means is
The detection value of the optical sensor is compared with the paddy brown rice discriminant value calculated by the discriminant value calculating means to discriminate whether the sample is paddy or brown rice. The removal rate detecting means detects the removal rate of the sample based on the discrimination result of the discrimination means. As described above, in the present invention, the frequency distribution of the detected values is obtained by using the reduced rice sample having a high content rate of paddy, and therefore the peaks corresponding to brown rice and paddy appear in the frequency distribution, respectively. .. Then, since the paddy brown rice discriminant value is obtained from the frequency distribution, the discriminant value thus obtained can be optimized. Therefore, the accuracy of discriminating unhulled rice can be improved, and the accuracy of detecting the shedding rate can be improved. Also, a single optical sensor can be commonly used for detecting the slid-out rice sample and the reduced rice sample. Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1 (a), reference numeral 1 is a removal rate detecting device according to the present invention, which is a sorting unit (not shown) of a hulling and sorting machine.
Samples are switched at each end of the reduced rice pipe 5 for supplying the reduced rice sample collected from the above, and the slide-out rice pipe 6 for supplying the slide-out rice sample collected from the mixed rice tank (not shown) on the discharge side of the removing section. While connecting to the device 7,
The discharge side of the sample switching device 7 is connected to the removal rate sensor 2 including an optical sensor via a sampling pipe 3 as a sample supply path. As shown in FIG. 1 (b), the sample switching device 7 selects a reducing rice pipe 5 or a sliding rice pipe 6 to bring it into a connected state with the sampling pipe 3, and a switching valve 8. Throttle switching motor 9 for driving the valve 8
And further has outlet sensors 10 and 11 for detecting the operating position of the switching valve 8. The removal rate sensor 2 is a so-called transmissive sensor, and as shown in FIG. 2, a light emitting element 13 such as a light emitting diode and a light receiving element 1 such as a phototransistor.
4, the sample is made to flow down between the light emitting element 13 and the light receiving element 14 to detect the amount of transmitted light.
The light amount of the light emitting element 13 can be changed. The electrical configuration of the removal rate detecting device 1 will be described. Reference numeral 12 is a controller including a CPU that controls each part and performs a predetermined calculation in a predetermined procedure described later, and the controller 12 has an input terminal Rate sensor 2, throw sensor 1
0 and 11 are electrically connected to each other, and the outlet switching motor 9 is electrically connected to the output side of the controller 12. Next, an example of the control of the embodiment of the present invention configured as above will be described with reference to the flow chart of FIG. 3 and the time chart of FIG. First, the throwing port switching motor 9 is rotated in the forward direction to operate the switching valve 8 toward the throwing port sensor 10 to connect the slide-out rice pipe 6 to the sampling pipe 3 (S1). Then, the amount of light of the light emitting element 13 is adjusted while supplying the removed rice sample A to the removal rate sensor 2. That is, when n grains of the ejected rice sample A pass between the light emitting element 13 and the light receiving element 14, the voltage is input to the controller 12 as a voltage according to the amount of light received by the light receiving element 14 and the frequency of the signal voltage of n grains is input. The distribution is calculated. Then, the controller 12 outputs the light amount adjustment voltage toward the light emitting element 13 so that the voltage having the maximum frequency of this frequency distribution matches the predetermined brown rice voltage V _G , and adjusts the light amount of the light emitting element 13. Yes (S2). This light amount adjustment is performed as shown in FIG.
The light amount of the light emitting element 13 is gradually changed from dark to bright in the order of A to D so that the voltage having the maximum frequency of the frequency distribution is made to coincide with a predetermined brown rice voltage V _G. In this way, since the slide-out rice sample is used for adjusting the light amount, the light amount can be set early after the start of operation. Thus, in step S2, the light emitting element 1
When the light amount of 3 is set, the throwing port switching motor 9 is rotated in reverse to operate the switching valve 8 toward the casting port sensor 11 side, and the reduced rice pipe 5
Is connected to the sampling pipe 3 (S3), the reduced rice sample B is supplied to the removal rate sensor 2, and the paddy voltage V
Calculate _M. That is, when the reduced grain sample B of n grains is supplied, the frequency distribution of the measured voltage of n grains is obtained,
A voltage corresponding to the peak value of power at the higher voltage range than the brown rice voltage V _G of the frequency distribution is detected as paddy rice voltage V _M (S4). Here, since the content of paddy in the reduced rice sample B is higher than that in the extruded rice sample A,
As shown in FIG. 4 (b), a peak value corresponding to paddy appears,
The paddy voltage V _M can be accurately detected. [0015] Then, in step S5, and the brown rice voltage V _G, based on the paddy rice voltage V _M obtained in step S4, performs predetermined calculation, paddy rice determination voltage for distinguishing between rice and rice Calculate V _S. When the paddy brown rice discrimination voltage V _S is calculated in this way, the slide-out rice pipe 6 is connected by the switching valve 8 (S
6) Detecting the removed rice sample A by the removal rate sensor 2 and comparing the detected value with the unhulled rice discrimination voltage V _S ,
Whether each grain of the sample is paddy or unpolished rice is discriminated, and based on the discrimination result, the content rate of unpolished rice in the exfoliated rice sample A, that is, the removal rate of the exfoliated rice sample A is calculated (S7,
FIG. 4 (c). Note that the shaded area in Fig. 4 (c) is calculated as brown rice). Further, the reduced rice pipe 5 is connected by the switching valve 8 (S8), and the reduced rice sample B is detected by the removal rate sensor 2, and the detected value is compared with the paddy brown rice discrimination voltage V _S, and the sample It is determined whether each grain is paddy or brown rice, and based on the result of the determination, the removal rate of the reduced rice sample B is calculated (S9, FIG. 4D). Here, the input of the data for calculating the removal rate in these steps S7 and S9 is started after a predetermined time T after switching the switching valve 8 (FIG. 5).
This time T is an appropriate time during which the rice remaining in the sampling pipe 3 should pass through the removal rate sensor 2 and the sample to be detected should be supplied. This is a sampling pipe 3
This is to ensure that the residual rice inside is discharged and to detect only the sample to be detected. After that, the operations of steps S6 to S9 are repeated, and the removal rates of the slide-out rice sample A and the reduced rice sample B are alternately calculated at regular intervals. The removal rate of the slide-out rice sample A calculated in this way is used for the removal roll gap control. In addition, the removal rate of the reduced rice sample B is used for supply amount control that adjusts the supply amount of the sorting unit. In the present embodiment constructed as described above, hitting the calculation of paddy rice voltage V _M, because it uses paddy content high reduction rice sample B, the frequency distribution of the detected voltage at its reduced rice samples A peak corresponding to paddy appears in addition to the peak corresponding to brown rice. As a result, the calculation of the paddy voltage V _M becomes appropriate, and the paddy brown rice discrimination voltage V _S calculated based on the paddy voltage V _M can be optimized and the paddy brown rice discrimination accuracy is improved. The rate detection accuracy can be improved. Further, in the present embodiment, the reduced rice pipe 5 and the slide-out rice pipe 6 are merged, and these pipes 5 and 6 are selected by the switching valve 8 and connected to the sampling pipe 3, so that a single disconnection is performed. There is an advantage that the rate sensor 2 can be commonly used for detecting the slid-out rice sample A and the reduced rice sample B. In this embodiment, the transmissive removal rate sensor 2 is used as the optical sensor, but a reflective sensor may be used instead. As described above, according to the present invention, the frequency distribution of the detected values is obtained using the reduced rice sample having a high content rate of paddy, and the discriminated value of the unhulled rice is obtained based on the frequency distribution. As a result, the determined discriminant value becomes appropriate, and the discrimination accuracy of unhulled brown rice is improved, and thus the removal rate detection accuracy can be improved. Further, there is an effect that a single optical sensor can be commonly used for detection of the slid out rice sample and the reduced rice sample.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a main part of a removal rate detecting device of an embodiment of the present invention,
(A) is the perspective view, (b) is a schematic front view which shows the sample switching device. FIG. 2 is a block diagram showing an electrical configuration of an embodiment of the present invention. FIG. 3 is a flowchart showing an example of control according to the embodiment of the present invention. 4 (a) to 4 (d) are diagrams showing the frequency distribution of grains at each stage of the processing of the example of the present invention. FIG. 5 is a time chart showing the control procedure of the embodiment of the present invention. [Explanation of Codes] 1 Depletion rate detection device 2 Depletion rate sensor 3 Sampling pipe 5 Reduced rice pipe 6 Sliding rice pipe 7 Sample switching device 8 Switching valve 9 Throw switch motors 10, 11 Throw sensor 13 Light emitting element 14 Light receiving element A Slide-out rice sample B Reduced rice sample V _G Brown rice voltage V _M Paddy voltage V _S Paddy brown rice discrimination voltage

Claims (1)

Claims: Selective means for selectively supplying either one of a sample of extruded rice treated in the depulling unit and a sample of reduced rice reduced in the sorting unit, and an optical property of the sample supplied. An optical sensor for detecting, a frequency distribution creating means for creating a frequency distribution of detection values of the n-grain reduced rice sample detected by the optical sensor, and a paddy based on the frequency distribution created by the frequency distribution creating means. Discrimination value calculating means for calculating the paddy brown rice discriminating value for discriminating unpolished rice, and comparing the detection value of the optical sensor with the paddy brown rice discriminating value calculated by the discrimination value calculating means, the sample is paddy or brown rice A depletion rate detecting device for a hulling machine, comprising: a discriminating means for discriminating whether or not the depletion rate is detected based on a discrimination result of the discriminating means.