JP2543804B2 - Operation control method for non-washed rice manufacturing equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the operation of a non-washed rice producing apparatus.

[0002]

2. Description of the Related Art An apparatus for producing so-called "non-washed rice" that can be cooked without polishing has already been proposed by the present inventor (Japanese Patent Application No. 4-6363). This is by washing the polished rice and then immediately drying the water adhering to the surface of the polished rice,
It is intended to obtain non-washed rice which has a good taste and is excellent in storability. In order to improve the quality of unwashed rice produced by such an unwashed rice producing apparatus, the degree of washing rice (level of washing rice)
It is important that the desired degree of dryness (drying level) is obtained.

First, the degree of rice washing will be explained. If it is too low, the substance that causes bran odor (a mixture containing a large amount of oil and fat as a main component contained in the aliuron layer of brown rice: hereinafter referred to as "ariuron residue") can be removed. It becomes insufficient, resulting in non-washed rice with a bran odor when cooked, and on the other hand, if the degree of rice washing is too high, the starch particles, which are the edible component of milled rice, will be severely detached and the rice washing yield will decrease. Or, the surface of the rice grain becomes rough and the stickiness of cooked rice becomes excessive, resulting in unwashed rice. Regarding the dryness, if this is too low, the water content of the non-washed rice becomes high and the non-washed rice has a low storability,
On the contrary, if the degree of dryness is too high, the rice grain surface layer shrinks due to overdrying and cracks occur in the rice grains.

The degree of rice washing is proportional to the degree of water absorption of polished rice when immersed in water under the same conditions. However, the water absorption is almost directly proportional to the water temperature, as can be seen from the graph in FIG. 9, which shows the increased water content of the polished rice when the three types of polished rice of different origins and varieties A to C are soaked in water for 10 seconds and immediately centrifugally dehydrated. The degree of rice washing also changes depending on the type of milled rice. The degree of dryness depends on the method of drying, but when water is evaporated by contact with air, for example, it changes depending on factors such as the temperature of the atmosphere and relative humidity.

[0005]

However, conventionally, it is possible to directly or indirectly detect the degree of rice washing and the degree of dryness which change due to the above-mentioned factors, and control the non-washed rice producing apparatus according to the result. Since it was not possible, the quality of unwashed rice was often deteriorated because the desired degree of rice washing and drying could not be achieved.

Regarding the dryness, it is considered that the final moisture content of unwashed rice should be measured with a moisture meter and the unwashed rice producing apparatus should be controlled based on this measurement result, but this is required for measurement accuracy and measurement. Due to the problem of time, it was practically impossible to perform such control using a commercially available moisture meter.

Since the main component of the aliuron residue, which causes bran odor, is oil and fat, it is considered that the degree of its removal can be examined from the concentration of the n-hexane extract substance of the washing water. Therefore, the inventor of the present invention puts 1 kg of polished rice in a container and a temperature of 20
Then, 1 liter of water at 0 ° C. was added, and the rice was stirred and washed at a constant strength, and the relationship between the washing time and the concentration of the n-hexane extract substance was investigated. As a result, as shown in the graph of FIG.
Hexane extractable substance concentration increased rapidly at the beginning of washing rice,
It was found that there was not much change after reaching about 1000 ppm.

The present inventor also investigated the relationship between the washing time and the BOD (biochemical oxygen demand) of the washing water in the above experiment. As a result, as shown in the graph of FIG. 11, although there was a difference depending on the type of milled rice, the washing time and BOD were substantially directly proportional.

Further, the present inventor investigated the relationship between turbidity and BOD of the washing water obtained in the above experiment. As a result, as shown in the graph of FIG. 12, a large amount of n-hexane extract was removed in the early stage of washed rice with low turbidity (A in FIG. 12), and polished rice was washed in the final stage of washed rice with high turbidity. The turbidity was almost directly proportional to the BOD, though there was a change considered to be caused by the fact that the crushed and crushed into fine particles (B in FIG. 12).

By the way, a high degree of rice washing means that a large amount of substances (aliuron residue, starch particles, etc .: hereinafter referred to as "leaving substances") that are released from the polished rice during rice washing are heavy. Since the substance is an organic substance, the amount thereof and the BOD of the washing water are in direct proportion. In addition, the BOD of rinsing water and turbidity are approximately directly proportional to each other as described above. Therefore, since the weight of the released substance and the turbidity are approximately directly proportional to each other, the rice washing degree is derived from the turbidity of the waste water after washing the rice, and the non-washed rice manufacturing apparatus is controlled so that the rice washing degree approaches the target rice washing degree. Then, it was considered that the desired degree of rice washing could be achieved such that the aliuron residue was sufficiently removed and the starch particles were released only slightly.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an operation control method for a non-washed rice production apparatus capable of producing high-quality non-washed rice.

[0012]

In order to achieve the above object, the present invention provides a method for controlling the operation of a non-washed rice production apparatus for producing non-washed rice by washing polished rice and then drying it. White rice is weighed with a raw material meter, the amount of water used for washing rice is detected with a water amount detector, and the turbidity of waste water after rice washing is detected with a turbidity detector. At least the raw material meter, water amount detector, And the rice washing degree is calculated based on each output value from the turbidity detector, and the control element relating to the rice washing degree is controlled so that the calculated rice washing degree approaches the preset target rice washing degree. .

Further, the polished rice to be washed is weighed with a raw material measuring device, and the non-washed rice after washing and drying is weighed with a product measuring device based on at least the output values from the raw material measuring device and the product measuring device. Then, the dryness of the non-washed rice is calculated, and the dryness control element is controlled so that the calculated dryness approaches the preset target dryness.

[0014]

According to the operation control method of the non-washed rice producing apparatus according to the present invention, when the polished rice is washed by the non-washed rice producing apparatus and then dried and processed into the non-washed rice, the polished rice to be washed is the raw material. In addition to being weighed by a weighing machine, the amount of water used for washing rice to be washed is detected by a water amount detector, and the turbidity of the waste water after washing is detected by a turbidity detector. Then, the degree of rice washing is calculated based on at least each output value from the raw material meter, the water amount detector, and the turbidity detector, and the calculated degree of rice washing is approximated to a preset target degree of rice washing. A desired degree of rice washing can be achieved by controlling the degree-related control element.

The polished rice to be washed is weighed by a raw material measuring device, and the non-washed rice after washing and drying is weighed by a product measuring device. Then, the dryness of the unwashed rice is calculated based on at least the output values from the raw material measuring device and the product measuring device, and the dryness is adjusted so that the calculated dryness approaches the preset target dryness. Since such a control element is controlled, a desired degree of dryness can be obtained.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an operation control method for a non-washed rice producing apparatus according to the present invention will be described below with reference to the drawings.

An apparatus for producing non-washed rice generally designated by reference numeral 1 in the drawing is a raw material tank 2 for storing polished rice as a raw material, a screw feeder 3 for discharging a predetermined amount of the polished rice in the raw material tank 2, A product that stores a primary washing part 4 and a secondary washing part 5 for washing polished rice discharged from the raw material tank 2, a drying part 6 for drying the polished rice after washing, and a non-washed rice discharged from the drying part 6. It is provided with a tank 7 and a bucket elevator 8 for introducing unwashed rice into the product tank 7.

The screw feeder 3 is driven by a motor 9. The primary rice washing unit 4 has a protrusion 13 (a feed protrusion 13a and a stirring protrusion 13b) on the peripheral surface inside a rice washing cylinder 12 having a polished rice receiving port 10 at one end and a discharge port 11 at the other end. The roll 14 is internally rotatably driven by a motor 15, and a pressure adjusting mechanism 16 is provided at the discharge port 11. In addition, the rice washing cylinder 12 is provided with a water injection port that communicates with a water source (not shown) through a water supply pipe 17, and further, a large number of pores 18 are formed in the lower portion of the rice washing cylinder 12 and A water receiving gutter 19 is provided on the side to configure. Reference numeral 20 is a solenoid valve that opens and closes the water supply pipe 17.

The secondary washing unit 5 is provided with a centrifugal dehydration tank 23 having a peripheral wall having a large number of pores 22 formed inside a casing 21, and inside the centrifugal dehydration tank 23, screw blades 24 are provided on the peripheral wall. The screw cylinder 25 having the above is provided, and the centrifugal dehydration tank 23 and the screw cylinder 25 are rotationally driven by the motor 26. At this time, the screw cylinder 25 rotates slightly faster than the centrifugal dehydration tank 23 by providing a difference in pulley diameter. Configure.

Inside the screw cylinder 25, a rice supply pipe 27 for supplying the polished rice from the outlet 11 and a water supply pipe 17 are provided.
While inserting the water supply pipe 28 branched from the middle of the process, a large number of rice discharge ports 29 and rinse water discharge ports 30 are provided on the peripheral wall of the screw cylinder 25 so as to correspond to the lower ends of the rice supply pipe 27 and the water supply pipe 28, respectively. Open.

Further, a large number of vent holes 31 are provided in the upper part of the peripheral wall of the screw cylinder 25, and an exhaust drain port 32 is opened in the lower part of the peripheral wall of the casing 21, and the exhaust drain port 32 is connected to the suction fan 34 via a suction hose 33. Connecting. 35 is a rice grain scattering prevention net, 36 is a rice receiving gutter, 37 is a rice receiving gutter 3
A discharge cylinder facing 6 and a transfer plate 38.

The drying unit 6 has a casing 3 having an open upper surface.
A disk-shaped net conveyor 40 is installed inside the motor 9 for the motor 4
1 is configured to be rotatably driven, and the rice grain from the discharge cylinder 37 is configured to be supplied to the upper surface of the net conveyor 40, and a part of the casing 39 is cut out to form a discharge port 42 to remove the rice grain. A guide plate 43 that guides to the discharge port 42 is provided. Reference numeral 44 denotes a cover fixedly connected to the casing 39 above the center of the net conveyor 40.
5 is a chute attached to the discharge port 42. Further, an intake port 46 is provided at the lower end of the casing 39, and a suction fan 48 is connected via a suction hose 47.

The above is the outline of the non-washed rice producing apparatus 1.
In this embodiment, in order to control the operating state of the non-washed rice producing apparatus 1, the following configuration is further added. First, the raw material measuring device 4 is provided between the screw feeder 3 and the primary washing unit 4.
9 is provided with the product weighing device 50 between the drying unit 6 and the bucket elevator 8. Both of the weighing devices 49 and 50 are provided with a load cell balance below the belt conveyor, and the weight of rice grains is measured together with the belt conveyor, and the weight of the belt conveyor itself is preset to be subtracted from the measured value and output. It should be noted that both the weighing devices 49 and 50 have the same time from when the rice grains are placed on the belt conveyor to when they are dropped from the end of the conveyor. (For example, the time is 10
If it is seconds, the output value will show the rice grain flow rate for 10 seconds. )

In addition, the pressure regulating mechanism 16 of the primary rice washing section 4 supports the upper portion of the support plate 52, which has the resistance lid 51 facing the discharge port 11 mounted on the lower portion thereof, by the projecting rod 53 so as to be swingable. A knob 55 is screwed to a support rod 54 that loosely penetrates the support plate 52, and a pressure adjusting spring 56 is provided between the knob 55 and the support plate 52.
And the resistance cover 51 by the pressure adjusting spring 56.
Energize toward 1.

Further, the motor 57 is provided so that its rotary shaft 58 freely penetrates the support plate 52, and the rotary shaft 58
A pressing plate 59 is screwed on the motor 5, and an auxiliary pressure-adjusting spring 60 is interposed between the support plate 52 and the pressing plate 59, so that the motor 5
With the forward and reverse rotation of 7, the pressing plate 59 moves in the axial direction, so that the urging force on the resistance lid 51 can be adjusted. Note that 61
Are pins provided through the pressing plate 59 in order to prevent the pressing plate 59 from rotating, and 62a and 62b are limit switches for limiting the moving range of the pressing plate 59.

Further, a water amount sensor 63 (water amount detector) is provided on the upstream side of the branch point between the water supply pipe 17 and the water supply pipe 28. Further, a gas-liquid separator 64 is provided in the middle of the suction hose 33, and a drain pipe 65 for collecting and joining the drainage separated from the air by this and the drainage from the water receiving trough 19 of the primary rice washing section 4 is provided. A turbidity detector 66 is provided in connection with the drain pipe 65. The turbidity detector 66 has a light emitting element 67 and a light receiving element 68, which are provided in opposition to each other, in a position that is always underwater, regardless of the flow rate of the drainage, and the turbidity of the drainage depends on the degree of attenuation of the received light. To detect. 69 is an overflow pipe for draining water from the turbidity detector 66.

The control system of the devices constructed as described above will be described. In FIG. 8, reference numeral 70 denotes a control device having a built-in storage / calculation means such as a microcomputer.
A raw material measuring device 49, a product measuring device 50, limit switches 62a and 62b, a water amount sensor 63 and a turbidity detector 66 are connected to the input side. In addition to the motors 9, 41 and 57 relating to the control elements, the motors 15 and 26, the solenoid valve 20, and the suction fans 34 and 48 are connected to the output side of the control device 70. Further, the control device 70 is provided with various start switches and a setting volume 71.

Next, the operation of the above embodiment will be described. Motors 15, 26, 41 and suction fans 34, 4
After starting 8 and starting the water supply by opening the solenoid valve 20, the motor 9 is rotated, and the milled rice stored in the raw material tank 2 is taken out by the screw feeder 3 and weighed by the raw material measuring device 49. After that, it enters the rice washing cylinder 12 through the receiving port 10 of the primary rice washing unit 4,
The discharge port 11 is formed by the feed protrusion 13a of the rotating roll 14.
Direction, the resistance lid 51 of the pressure regulating mechanism 16 is pushed open to be discharged from the discharge port 11, while the polished rice is supplied with water while the flow rate is detected by the water amount sensor 63.
The water sent through the water is added from the water injection port, and at the same time, it is stirred by the stirring projection 13b, and the released substances such as aliuron residue are dissolved or suspended in the water, and this water is discharged from the pores 18. The collected rice is collected in the water receiving trough 19, and the polished rice is discharged from the discharge port 11 and put into the rice supply pipe 27.

When the milled rice introduced into the rice supply pipe 27 falls and reaches the bottom of the screw cylinder 25, the screw cylinder 2
The water that is attached to the polished rice is finely divided by the centrifugal force caused by the rotation of 5 and is radially moved, discharged from the rice discharge port 29, enters the centrifugal dehydration tank 23, and is pressed against the peripheral wall by the centrifugal force. It is discharged from 22.

While the milled rice is centrifugally dehydrated, it is fed up by the centrifugal dehydration tank 23 and the screw blades 24 of the screw cylinder 25 that rotates differentially, and in the middle of the process, from the water supply pipe 17 through the water supply pipe 28 to the screw cylinder 25. The water supplied to the inside is discharged from the rinse water discharge port 30 by the centrifugal force and poured into the polished rice in a shower shape, so that the detached substances remaining on the surface of the polished rice are further rinsed off, and the pores are removed together with the water. Two
Emitted from 2.

The polished rice thus rinsed and drained by centrifugal dewatering is scattered in the radial direction when it reaches the upper end of the centrifugal dewatering tank 23, and is caught by the rice scattering prevention net 35 to be caught in the rice receiving trough. When the discharge cylinder 37 comes to a place where the discharge cylinder 37 is opened while being dropped into the inside 36 and being moved in the circumferential direction by the transfer plate 38, it is dropped inside and discharged onto the net conveyor 40 of the drying unit 6.

The suction fan 34 constantly sucks the air from the upper end of the screw cylinder 25 to the exhaust port 32 through the vent hole 31 and the pores 22, so that the air is discharged from the pores 22. Water is quickly exhausted and drained 3
From 2 through the suction hose 33 to the gas-liquid separator 64, where it is separated from the air and flows into the drainage pipe 65, merges with the drainage from the water receiving trough 19 of the primary washing unit 4, and the turbidity detector After the turbidity is detected by 66, a wastewater treatment facility (not shown) separately provided via the overflow pipe 69
And sent to sewers.

The milled rice discharged onto the net conveyor 40 is successively spread on the net conveyor 40 as it is rotated in the direction of arrow C and transferred in the circumferential direction.
The water adhering to the surface is evaporated and dried by the wind blown from the top to the bottom of the net conveyor 40 by the suction of the suction fan 48. When the guide plate 43 is reached,
The chute 4 is guided along the front wall to the outlet 42.
After sliding down 5, the product is weighed by the product measuring device 50, and then, is put into the product tank 7 through the bucket elevator 8.

The operation control operation of the non-washed rice producing apparatus 1 for producing non-washed rice as described above is as follows. The output values from the raw material meter 49, the product meter 50, the water amount sensor 63, and the turbidity detector 66 are input to the control device 70 at any time. Then, first, the output value from the raw material meter 49 (hereinafter referred to as "milled rice flow rate"), the water amount sensor 6
Based on the output value from 3 (hereinafter referred to as "washed water amount") and the output value from the turbidity detector 66 (hereinafter referred to as "detected turbidity value"), for example, the weight ratio of rice to water is 1: 1. In this case, the turbidity value (hereinafter referred to as “calculated turbidity value”) is calculated.
That is, even if the absolute amount of the released substances is the same, the turbidity of the waste water after washing will change if the weight ratio of rice and water changes, so that no error will occur.

The calculated turbidity value is calculated by a calculation formula preset in the control device 70, for example, the detected turbidity value × the amount of water for washing rice / the flow rate of polished rice = the calculated turbidity value. As described above, since the weight of the released substances and the turbidity of the waste water after washing the rice are substantially directly proportional to each other, the calculated washing turbidity value expresses the rice washing degree.

Then, it is determined whether or not the calculated degree of rice washing is within the range of the target degree of rice washing preset in the controller 70. Specifically, this judgment is made based on whether or not the BOD of the wastewater after washing the rice, which is derived from the calculated turbidity value based on the result of the experiment or the like, is in the range of 15,000 to 17,000 ppm. 10 to 12
As can be seen from the examination of the above, if the washing degree is such that the BOD falls within the above range, the concentration of the n-hexane extract substance is sufficiently increased in any of the polished rices of A, B and C. At least, no bran odor remains on the unwashed rice, and it is considered that the release of starch particles does not increase extremely.

When it is determined that the calculated degree of rice washing is too low, first the motor 57 is rotated forward to move the pressing plate 59 to the motor 57 side, and the discharge port 11 to the resistance lid 51 is moved.
By increasing the biasing force in the direction, the frictional force acting on the rice grains in the rice washing cylinder 12 is increased and the degree of rice washing is increased.
Even if the pressing plate 59 reaches the limit switch 62b, if the calculated degree of rice washing does not fall within the range of the target degree of rice washing, the rotation speed of the motor 9 is reduced to bring the amount of milled rice into the rice washing cylinder 12. By reducing the amount of rice grains 12
Lengthen the stay in the house and increase the degree of rice washing.

On the other hand, when it is judged that the calculated degree of rice washing is too high, first, the rotation speed of the motor 9 is increased to shorten the staying time of the rice grains in the rice washing cylinder 12, and the rice is still calculated. If the degree of rice washing does not fall within the range of the target degree of rice washing, the motor 57 is reversely rotated to reduce the frictional force acting on the rice grains in the rice washing cylinder 12,
Decrease the degree of rice washing. As described above, the desired degree of rice washing can be achieved.

Next, the control of dryness will be described. First, for example, based on the BOD of the waste water after washing rice derived from the calculated turbidity value based on the results of experiments, and the polished rice flow rate, the weight of the released substance is a calculation formula preset in the controller 70, For example, it is calculated by the following: polished rice flow rate × BOD ÷ 1,000,000 × a = weight of released substance. It should be noted that a is a coefficient corresponding to the BOD per unit weight of the substance, and in the case of a substance released from polished rice, it is suitable to be about 0.95, for example.

The weight of the released substance, the flow rate of polished rice,
And the difference in the water content rate between the polished rice and the unwashed rice (hereinafter referred to as “increased water content”) is calculated based on the output value from the product weighing device 50 (hereinafter referred to as “non-washed rice flow rate”). The increased water content is calculated by a calculation formula preset in the control device 70, for example, the flow rate of non-washed rice / (flow rate of polished rice−weight of released substance) −1 = increased water content. This increased moisture content represents the dryness of unwashed rice.

Then, it is judged whether or not the calculated dryness is within the range of the target dryness preset in the control device 70. Specifically, this judgment is, for example, in the range where the increased water content is 0.002 ≦ increase water content ≦ 0.007 (the water content of unwashed rice is increased by 0.2 to 0.7% from polished rice). It is performed depending on whether it is within the range). When it is determined that the calculated dryness is too low (insufficient drying), the rotation of the motor 41 is slowed to increase the time (drying time) for the rice grains to be on the net conveyor 40, and to dry the rice. Increase the degree. On the contrary, when it is determined that the dryness is too high (excessive dryness), the drying time is shortened by increasing the rotation of the motor 41 to decrease the dryness. In this way, the desired dryness can be achieved.

The above is the operation control operation of the non-washed rice manufacturing apparatus 1 in this embodiment. In addition, it is desirable that the control as described above be performed stepwise by reducing the control width per time. In addition, since it takes some time after the control is performed once until the result is reflected in the detected value, it is desirable to set the control interval at least longer than this time. By the way, in reality, changes in the atmosphere temperature, the relative humidity, the temperature of the washing water, etc., which are factors that change the degree of rice washing and the degree of drying, are not so rapid, so control is performed at intervals of about 1 to 2 minutes. Therefore, it is possible to sufficiently follow the change.

However, in an unstable state immediately after the start of operation, if the control width per operation is small, it may take too long to reach a desired degree of washing or drying. Therefore, when the calculated degree of rice washing or dryness deviates significantly from the target degree of rice washing or dryness, the control width is increased once, and when the deviation is small, the control width is reduced once. It is possible to shorten the time until a stable state is achieved by performing such control.

Further, based on the measurement results of the temperature of the atmosphere, the relative humidity, the temperature of the washing water, and the like, and the water absorption rate data according to the origin and variety of the polished rice used as a raw material, the desired degree of washing and drying It may be possible to shorten the time required to reach a stable state after the start of operation by initially setting each control element so that Further, it is conceivable that such an initial setting is automatically performed by transmitting the outputs of the thermometer, the hygrometer, the water thermometer, etc. to the control device 70.

Needless to say, the above-mentioned examples do not limit the technical scope of the present invention. For example, the calculation method of the degree of rice washing and the degree of dryness, the method of determining the target degree of rice washing and the degree of dryness. Etc. are not limited to the above-mentioned embodiment and are arbitrary. In addition, since the weight of the released substance was taken into consideration when calculating the dryness in the above-mentioned example, the dryness was calculated extremely accurately, but without considering the weight of the released substance, only the flow rate of the polished rice and the non-washed rice flow rate was used. It is also possible to calculate the dryness.

Furthermore, the detection methods of the raw material measuring device, the product measuring device, the turbidity detecting device, and the water amount detecting device are arbitrary. Also, the control element relating to the degree of rice washing and the degree of dryness is not limited to the above-mentioned embodiment as long as it can change the degree of rice washing and the degree of dryness. For example, the net conveyor of the drying unit 6 can be used. It is also possible to change the degree of dryness by installing a heater above 40 and controlling the amount of heat generated by the heater.

Furthermore, the constitution of the non-washed rice production apparatus controlled by the method of the present invention is not limited to the above-mentioned embodiment, and any apparatus can be used as long as it satisfies the requirement that the polished rice is washed and then dried. The method of the present invention can be applied even to a non-washed rice producing apparatus having a configuration.

[0048]

As described above, according to the operation control method of the non-washed rice producing apparatus according to the present invention, when the polished rice is washed by the non-washed rice producing apparatus and then dried to be processed into non-washed rice. The polished rice to be washed is measured by the raw material measuring device, the amount of water used for washing the rice is detected by the water amount detector, and the turbidity of the waste water after the rice washing is detected by the turbidity detector. And at least the raw material meter,
The rice washing degree is calculated based on each output value from the water quantity detector and the turbidity detector, and the control element related to the rice washing degree is controlled so that the calculated rice washing degree approaches the preset target rice washing degree. As a result, the desired degree of rice washing can be achieved. Therefore, the degree of rice washing is too low to produce a bran-like odor when it is cooked, or conversely, the degree of rice washing is too high and starch particles, which are the edible component of milled rice, become severely detached and the rice is washed. It is possible to prevent the non-washed rice from having a low yield and having the surface of the rice grains roughened to become unwashed rice having excessive stickiness when it is made into cooked rice, and it becomes possible to produce high-quality unwashed rice.

The polished rice to be washed is weighed by the raw material measuring device, and the non-washed rice after washing and drying is weighed by the product measuring device. Then, the dryness of the unwashed rice is calculated based on at least the output values from the raw material measuring device and the product measuring device, and the dryness is adjusted so that the calculated dryness approaches the preset target dryness. Since such a control element is controlled, a desired degree of dryness can be obtained. Therefore, the dryness is too low and the water content of unwashed rice is high, resulting in unwashed rice with low storability, or conversely, the dryness is too high and the rice grain surface layer shrinks due to overdrying and cracks in the rice grain. It is possible to produce high quality non-washed rice.

[Brief description of drawings]

FIG. 1 is a no-wash control controlled by an operation control method according to the present invention .
It is a schematic block diagram which showed a part of rice production apparatus in a cross section .

FIG. 2 is a vertical cross-sectional view showing a part of a primary rice washing unit and a pressure adjusting mechanism.

FIG. 3 is a schematic cross-sectional view taken along line AA of the primary rice washing section.

FIG. 4 is a vertical sectional view of a secondary rice washing section.

FIG. 5 is a front view of a screw cylinder.

FIG. 6 is a plan view of a drying unit.

FIG. 7 is a vertical sectional view of a turbidity detector.

FIG. 8 is a schematic configuration diagram of a control device.

FIG. 9 is a graph showing the increased water content of polished rice.

FIG. 10: Relationship between washing time and n-hexane extract substance concentration
It is a graph which shows a relation.

FIG. 11 is a graph showing the relationship between the rice washing time and BOD .

FIG. 12 is a graph showing the relationship between turbidity and BOD .

[Explanation of symbols]

1 Non-washed rice manufacturing device 9 Motor (control element relating to rice washing degree) 41 Motor (control element relating to dryness) 49 Raw material measuring instrument 50 Product weighing instrument 57 Motor (controlling element relating to rice washing degree) 63 Water amount sensor (water amount detector) ) 66 Turbidity detector

Claims (2)

(57) [Claims] 1. Washing polished rice and then drying it.
Those who control the operation of non-washed rice production equipment that produces more non-washed rice
According to the law, the polished rice to be washed is weighed with a raw material meter and used for washing.
The amount of water used for washing rice is detected by a water amount detector and
The turbidity of water is detected by a turbidity detector and
Outputs from the charge meter, water amount detector, and turbidity detector
Calculate the degree of rice washing based on the value, and calculate the calculated degree of rice washing close to the preset target degree of rice washing.
To control the control elements related to rice washing
A method for controlling the operation of a non-washed rice manufacturing apparatus, which is a feature. 2. Washing polished rice and then drying.
Those who control the operation of non-washed rice production equipment that produces more non-washed rice
According to the law, the polished rice to be washed is weighed with a raw material meter, washed and dried.
Weigh the non-washed rice after drying with a product scale and
Based on each output value from raw material measuring instrument and product measuring instrument
The dryness of unwashed rice is calculated and the calculated dryness is close to the preset target dryness.
To control the dryness control element.
A method for controlling the operation of a non-washed rice manufacturing apparatus, which is a feature.