JPH03278846A - Detection control system for hulling ratio of huller and the like - Google Patents

Abstract

PURPOSE:To enhance hulling ratio detection accuracy by calculating a threshold value from an unhulled rice average block value and an unpolished rice average block value on the basis of the quantity-of-transmitted light distribution to the transmissivity block of hulled rice due to the projection of light of a sensor. CONSTITUTION:A part of the hulled rice 3 due to a hulling apparatus 2 is passed through the charging region of a hulling ratio sensor 1 as sampling grain. The quantity of transmitted light due to the projection of light of the sensor at every one sampling grain is detected as transmissivity and shown as quantity-of-transmitted light distribution 4. Since unpolished rice G is positioned in a block of a high transmissivity value and unhulled rice M is positioned in a block of a low transmissivity value, the threshold value K showing the boundary position between them is calculated. Then, a hulling ratio is calculated and outputted to a gap control motor 15 to control a roll gap. By this constitution, hulling ratio detection control can be rapidly completed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a removal rate detection control method for a rice huller, etc., and can also be used in a rice hulling plant, etc.

(Prior art and the problem to be solved by the invention)
While passing rice removed by a huller through the light emitting area of the rate sensor, the threshold value that is the boundary between paddy and brown rice is determined based on the distribution state of the transmittance of the removed rice by this sensor light emission. In a control mode for detecting a break-through rate that calculates a break-through rate using a threshold value, there is a processing mode in which a block in which a peak grain number exists is determined as an average block value for brown rice when determining the transmittance of brown rice. Depending on the transmittance distribution state, the transmittance of brown rice tends to vary depending on where the peak value is, and the accuracy of calculating the removal rate decreases.

In addition, in Figures 9 and 10, the average block value of brown rice is calculated based on the number of grains at the peak value, and the block light intensity of the number of grains within a certain number of grains from this standard number of grains is calculated. When calculating the added value by using the added value of the grain number as the value left over from the added value of the grain number, as shown in Figure 9, the peak value A
If it is outside the block of the appropriate range n, there may be insufficient light intensity adjustment of the removal rate sensor, dirt on the lens of the light emitting element or light receiving element, poor flow of the rolled rice, etc. If the peak value A is not within the block within the appropriate range n, cancel the data from the current sampling grain, recreate the transmitted light amount distribution using a new sampling grain, and calculate the brown rice average block value. Compute and control.

Therefore, in this type of control, even if the accuracy of detection of the removal rate is high, the detection control requires a long time.

(Means for Solving the Problems) This invention provides a method for passing rice 3 that has been removed by the hulling device 2 through the sensor light emitting area of the rice grain rate sensor 1, and blocking the transmittance of the rice 3 that has been removed by the sensor light emitting light. Based on the transmitted light amount distribution 4 shown as the relationship between the number of grains and
and the brown rice average block value KG, which is the average transmittance value of blocks in a preset appropriate range n, to calculate the threshold value K, which is the boundary between paddy M and brown rice G, and calculate the removal rate. This is a configuration of a removal rate detection control system for a rice huller, etc., which is characterized by the following.

(Function) When a part of the crushed rice 3 that has been scraped out by the hulling device 2 is passed through the sensor light emitting area of the dehulling rate sensor 1 as sampling grains, the sensor light is emitted for each grain of this sampling grain. The amount of transmitted light is detected as transmittance, and the relationship between the number of sampled particles for each block based on the average transmittance value is shown as transmitted light amount distribution 4. In this transmitted light amount distribution 4, since the brown rice G is located in the block with larger transmittance and the paddy M is located in the block with smaller transmittance, the threshold value K indicating the boundary position between these is set to It is determined by the average block value KM of paddy in the brown rice block section and the average block value KG of brown rice in the brown rice block section, and the shedding rate is controlled by arithmetic processing.

In particular, the brown rice average block value KG is determined as the average transmittance value by calculating the average of each block value in a preset appropriate range n.

(Effect of the invention) In this way, in the sensor light emission of the polished rice 3 by the removal rate sensor 1, the number of n blocks within the preset appropriate range is determined by the transmitted light amount distribution 4 shown as the relationship between the number of grains and the transmittance block. Since the brown rice average block value KG is determined as the transmittance average value of can be completed.

(Example) In addition, in the rotation, the hulling machine has a pair of dehulling rolls 5 and 6 at the top of the machine body, which have a difference in rotational circumferential speed, as shown in FIG.
A paddy-hulling device 2 consisting of a paddy-hulling device 2, a paddy supply funnel 7 that supplies paddy to the hulling device 2, and a rotary sorting tube that sorts the crushed rice 3 removed from the hulling device 2 into brown rice G and paddy M. sorting device 8
In addition, a wind selection device 9 for wind-selecting the rice removed by the hulling device 2 is provided at the bottom of the machine.

In addition, on the - side of the machine, a dehulling rate control device 10 is installed to control the hulling, and a dehulling rate control device 10 is installed to detect the dehulling rate from the sampled grains while flowing down some sampled grains of the hulled rice. ■A rate sensor 1 is provided. Reference numeral 11 denotes a crushed rice grain lifting machine, which receives the crushed rice crushed by the hulling device 2, the returned mixed rice sorted by the sorting device 8, etc., and sends the grain to the sorting device 8 for frying. . 12 is a brown rice frying machine, and the sorting device 2
It is configured to receive and take out the brown rice that has been wind-selected by the brown rice wind-selecting device 13 below. Reference numeral 14 denotes a dust extractor that sucks and discharges the rice husks, dust, etc. that have been air-selected by the wind-selecting devices 13.9.

In FIG. 1, a removal rate control device 10 having a microcomputer CPU receives input from a removal rate sensor 1 and controls output of a gap control motor 15 that adjusts the roll gap between removal rolls 5 and 6. The configuration is as follows. The removal rate sensor 1 allows the light emitted from the light emitting element 16 to the light receiving element 17 to pass through each sampling grain of the polished rice 3, thereby detecting the value of the light receiving element 17 when the sampled grains are irradiated. The amount of transmitted light received is detected and outputted to the removal rate control device 10.

The light amount control device 18 is provided as a part of the removal rate control device 10, and has an output circuit 19 for automatically adjusting the light amount of the light emitting element 16. A circuit 20 for inputting the amount of transmitted light for each particle, and a particle signal amount detection circuit 21 for detecting a signal for each particle.
In this configuration, the light amount according to No. 6 is automatically adjusted and controlled so that it falls within a light amount adjustment setting range based on a preset reference voltage (FIG. 2).

Regarding the arithmetic processing control of the removal rate in the removal rate control device 10, FIG. This figure shows a general form of a graphic transmittance particle number distribution curve (hereinafter referred to as transmitted light amount distribution) 4. The process of calculating the withdrawal rate in this withdrawal rate control device 10 is as follows.

(1) Graphic processing control of such transmitted light amount distribution 4 is performed.

(2) While calculating and processing this transmitted light amount distribution 4, control is performed to adjust the light amount of the removal rate sensor 1 itself.

(3) From this transmitted light amount distribution 4, the brown rice average block value KG
and the paddy average block value KM are calculated and controlled.

(4) The calculation process is controlled using the boundary block value, which is the boundary position between brown rice G and paddy M in the transmitted light amount distribution 4, as a threshold value.

(5) With this threshold value K as the boundary, the number of grains sampled on the brown rice G side and the number of grains sampled on the paddy M side are removed.
Calculate and control the rate.

This is done through each step.

To explain this threshold value calculation control in more detail, the transmittance of the amount of transmitted light is divided into N blocks from the maximum to the minimum transmittance, as shown in FIG. Therefore, the number of grains sampled twice is set to 200, for example.
0 grains, the detection time by the removal rate sensor 1 is 20 seconds,
The number of blocks N is 64 blocks. Further, the output voltage corresponding to each average amount of transmitted light among the total number of blocks N is set to be output as a signal voltage of 0 to 10 V (volts).

The brown rice average block value KG is the average value of brown rice, and this calculation is performed when the transmitted light amount distribution 4 after light amount adjustment is in the block in the preset appropriate range n=al~a9 as shown in FIG. Assuming that each grain number is R-R9, average block value of brown rice KG = (applicable block number) x (applicable block number of grains) addition value/applicable block total number of grains = (a I X R1 + a 2 X R2+a 3
X R3+a4XR4+a5XR5+a6 X R6+ a 7 X R7+ a 8 X R8+
a9XR9)/(R1+R2+R3 +R4+R5+R6+R7+R8+R9). That is, the average amount of transmitted light per -grain is calculated using the average block value in the appropriate range block n.

The paddy average block value KM is the average value of paddy, and in this calculation, the maximum block is a block obtained by cutting, for example, 5 grains from the paddy side of the total number of sampled grains (2000 grains), and a certain number of blocks from this paddy side are calculated. (For example, n=10 blocks)
The value obtained by dividing the added value of the integrated light amount by the added value of the number of grains.

That is, the average amount of transmitted light per grain in the M peak value portion of the rice grain is determined.

In this way, when the brown rice average block value KG and the paddy average block value KM are determined, the threshold value K, which is the boundary block value, is determined by each of these average block values KG and KM.
is calculated using the following formula.

K= (KM-KG)

Less than 100 grains...k=0.55100-149
Grain ・k=0.47 150 grains or more ・・・k=0.40 When calculating the removal rate from the distribution of sampled grains of polished rice, the distribution for the transmittance of the light emitted by the removal rate sensor 1 is The distribution form is not one in which G and rice M are completely separated, but a distribution in which the two are phase-polymerized close to the threshold value, and the accuracy of the calculated dehulling rate is determined by the threshold value K. By taking advantage of the fact that the number of grains in the upper case block changes depending on the actual rate, and adjusting the position of the boundary block according to the number of grains, it is possible to improve the accuracy of the calculated evasion rate relative to the actual evasion rate. .

Once the threshold value K is determined in this way, for example, the ratio of the total number of grains of brown rice G on the brown rice side is calculated from the threshold value K to the total number of grains sampled (2000 grains) as shown in the following equation. ■ Rate.

Elimination rate = ((total number of grains sampled - total number of grains in blocks above the threshold value)/total number of grains sampled) xlOO
(%) When the removal rate is calculated in this way, the gap control motor 15 is outputted to adjust the roll gap so that the calculated removal rate becomes the set removal rate.

Incidentally, such a transmitted light amount distribution 4 is as shown in FIG.
By performing a new detection each time the removal rate is detected for a fixed number of sampled grains, it is possible to eliminate the influence of variations in the transmittance of brown rice or of paddy, without being affected by the transmitted light amount distribution from the previous detection. It is possible to improve the accuracy of the calculated omission rate.

Furthermore, as shown in FIGS. 7 and 8, the amount of transmitted light differs depending on the type, variety, etc. of the pressed rice 3, and the form of the transmitted light amount distribution curve 4 differs. For example, in non-glutinous rice, the peak value of the transmitted light amount distribution 4 is formed in two places, one in the brown rice part and the other in the paddy part, but in glutinous rice, it is often formed only in the brown rice part and not in the paddy part. Utilizing such characteristics, while detecting the transmitted light amount distribution 4, discrimination control is performed as shown in FIG. 8, and control for detecting the removal rate suitable for the product type is performed. In transmitted light amount distribution 4, the paddy average block value is in KB for non-glutinous rice and KA for sticky rice,
The non-glutinous rice appears on the high transmittance side, and the glutinous rice appears on the small transmittance side, shifting back and forth with respect to the intersection T of the four curves of both transmitted light quantity distributions. This point T is set in advance, and the paddy average block value of the transmitted light quantity distribution 4 detected by the sampled grains is compared to determine whether the rice is sticky rice or non-glutinous rice.

[Brief explanation of drawings]

The figures show an example of the present invention, and Fig. 1 is a control block diagram, Figs. 2 and 3 are graphs of the transmitted light quantity distribution detected and controlled by the removal rate sensor, and Fig. 4 is a part thereof. , Figure 5 is a slope view of the rice huller, Figure 6 is a flowchart showing part of the control process, Figure 7 is a transmitted light amount distribution graph showing the form of transmitted light amount distribution, and Figure 8 is a part of it. FIG. 9 is a transmitted light quantity distribution graph in another invention, and FIG. 10 is a flowchart showing a part of the control processing. (Explanation of symbols) 1 Deactivation rate sensor 2 Hulling device 3 Dehulled rice 4 Transmitted light amount distribution M paddy N Block value n Appropriate range G Brown rice K Threshold! +-shise -1--c* 54 hFigure 3Figure 6Figure 8Figure 9/Gin-111 7)1. ＋ /ㅅ FUDtsu Figure 70 Procedural Amendment (Method) 2. Name of the invention Dehulling rate detection control method for rice huller, etc. 3. Person making the amendment Relationship with the case

Claims (1)

[Claims] While passing the removed rice 3 by the hulling device 2 through the sensor light emitting area of the dehulling rate sensor 1, the transmitted light amount distribution 4 shown as the relationship between the grain number and the transmittance block of the removed rice 3 by the sensor light emitting , the threshold value K, which is the boundary between the paddy M and the brown rice G, is determined by the paddy average block value KM and the brown rice average block value KG, which is the transmittance average value of the blocks in the preset appropriate range n. A method for detecting and controlling the removal rate of rice hullers, etc., which is characterized by calculating the rate.