JPH0647296A - Rice polishing method - Google Patents

Abstract

(57) [Summary] [Purpose] When whitening brown rice stored in multiple brown rice tanks, the degree of whitening is determined according to the degree of damage. [Structure] The surface damage degree of brown rice to be whitened is measured, and the whitening treatment is performed based on the relationship between the damage degree and the whitening degree set in advance from the measurement result.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a rice polishing method.

[0002]

2. Description of the Related Art When the brown rice is subjected to a whitening treatment, its whitening degree can be set according to preference.

[0003]

In recent years, however, the taste has come to be discussed, and the surface layer portion, which is a factor of deterioration, may remain if only the degree of whitening is performed according to the taste of the customer as in the conventional case. In addition, when the degree of damage is large, the taste may deteriorate depending on the storage condition thereafter. That is, when the surface layer of brown rice is damaged, enzymes are likely to newly enter from the damaged part, or neutral fat is leaked from the inside to generate fatty acids, which contributes to the odor of old rice.

[0004]

SUMMARY OF THE INVENTION The present invention attempts to eliminate the above-mentioned drawbacks by performing a whitening treatment by knowing the degree of damage of brown rice, and measuring the degree of surface damage of brown rice to be whitened. The rice polishing method is configured to perform a whitening treatment based on a preset relationship between the degree of damage and the degree of whitening.

[0005]

[Advantageous effects of the invention] The milling degree is compulsorily set in consideration of the degree of damage of brown rice. However, most of the damage causes deterioration in taste, so the milling degree is set to completely remove this. Therefore, it is possible to eliminate the above-mentioned drawbacks and to contribute to the production of white rice having a good taste.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. A brown rice tank 3 capable of storing a plurality of different types of brown rice is arranged on the left side of the central elevator 2 in the building 1, and a rice milling machine 4 and a dust collector 5 are arranged on the right side. The elevator 2
Is a known bucket type elevator, and a load receiving hopper 6 is connected to the lower part thereof. On the other hand, in the throwing-out cylinder frame 7 connected to the upper side of the elevator 2, the first flow path cylinder 8 and the second flow path cylinder 9 are connected to the left and right in an inclined state, and lifted when the switching valve 10 is switched to the left or right. It is configured so that grains can be selectively supplied to either one.

The lower end side of the first flow path cylinder 8 is looked into the brown rice tank 3 via a switching valve 11. The brown rice tank 3 includes partition members 12 and 12 arranged radially from the center side.
Are divided into a plurality of sections (six sections in the example in the figure), each of which is provided with a receiving port 13, 13 ..., In addition, opening / closing shutters 14, 14 ... are provided on the lower side narrowed to the center side, and each section is further divided. The tank part is the main tank part 15 with a large volume.
, And a small-volume residual auxiliary tank portion 17, 17 ... Partitioned by partitions 16, 16 ... The brown rice tank 3 as described above is rotatably supported by a central shaft 18 which is supported by the ceiling and the floor of the building.
It can rotate in conjunction with the ceiling side motor 19.

Therefore, by switching the switching valve 11, the grain flow path to the main tank portion 15 (solid line in FIG. 5) and the grain flow path to the residual auxiliary tank portion 17 via the transverse feed spiral cylinder 20 (see FIG. 5). It has a configuration that can be switched to the communication with the (dotted line).
The shutter 14 provided under each main tank 15 can open the outlet of the auxiliary tank 17 and then the main tank 15 from a position where both the outlets of the main tank 15 and the auxiliary tank 17 can be closed at the same time. Can rotate.

Reference numeral 21 is a weighing machine, and a load cell is arranged below the hopper section 22 so that the detection result can be output to a control section described later. An opening / closing shutter 23 is provided at the end of the discharging portion connected to the hopper portion 22, and the grain in the hopper can be returned to the lower end side of the elevator 2 by opening the shutter 23. The second flow path cylinder 9 is looked into the rice polishing tank 24. The tank 24 has a structure in which a spiral body 25 of vertical axis rotation is provided in the center portion to perform stirring and mixing processing.

At the lower part of the tank 24, a rice polishing machine 4 is provided so that its cylindrical body is inclined by an angle α with respect to the horizontal plane. That is,
A rotary shaft 27 constituting a well-known roll-in roll unit, a whitening roll unit, and the like, and a cylindrical body 28 surrounding the rotary shaft 27 are provided in a low inclination of a polished rice discharge unit 29 in a polishing chamber below the tank 24. Reference numeral 30 is a drive motor that interlocks with the rotary shaft 27. A resistance plate 31 is closely attached to the discharge portion 29 via a spring 32. The spring 32 can be received by a receiving seat 34 which can be moved forward and backward by the control motor 33 in the axial direction to change the whiteness to a predetermined pressure, and can also be opened from the discharge portion 29 with a predetermined gap. (A virtual line in FIG. 4). Reference numeral 35 is an intermediate member that rotates integrally with the control motor 33 and is screwed into the screw portion of the seat 34.

A bran collecting hopper 36 is introduced into the dust collector 5 through a passage 37. A white rice passage 38 is formed below the discharge portion 29, and a branch passage 39 is provided in the middle of the rice rice passage 38, and the direction is determined by a switching valve 40. The white rice passage 38 is seen in the product (white rice) storage bag, and the branch passage 39 is the load receiving hopper 6.
Nozomi. The brown rice that is first discharged by pressing the resistance plate 31 does not yet attain a predetermined whitening state sufficiently, and therefore the switching valve 40 is switched to the communication side of the branch passage 39 (solid line in FIG. 4), and work is started. The unpolished white rice that is discharged from the timer for a set time (for example, several tens of seconds)
9, the load receiving hopper 6, the elevator 2, the rice polishing tank 24 and the like, and is returned to the inside of the white polishing cylinder 28 to be subjected to the re-whitening action.

The dust collector 5 has a construction in which a suction fan is built in and dust collected from the bran discharge tube 43 communicating with the passage 37 is separated by a cyclone (not shown). Reference numeral 44 is an operation panel provided on the front door or wall of the building 1, and the brown rice tank 3 (NO.
1-NO. 6) which displays the brown rice varieties accommodated in 6), the varieties selection switches 46, 46
... Polished rice amount designation switches 47, 47, which can be designated in units of 1 kg among 1 kg to 5 kg, and whitening degree selection switch 4
8, 48, coins, bill insertion ports 49, 50, etc. are arranged. In addition, the polished rice removing section 51 is provided with a bag setting section 52 and an empty bag supply section 53.

The elevator 2 to which the load receiving hopper 6 is connected is provided with a damage detecting device 54 for measuring the degree of surface damage (skin dislocation) of the load receiving brown rice. The apparatus is composed of a one grain feeding section 55 for feeding one grain upon receipt of the brown rice overflowing from the fried bucket, a camera detection section 56 provided on the lower end side of the feeding section 55 for detecting the degree of surface damage of the transferred brown rice, and the like. That is, the gutter-shaped feeding portion 55 is provided with appropriate vibration so that one grain of brown rice can flow down, and the camera detection portion 56 can estimate the surface scratch area by counting the binarized signal for each minute unit. It is a composition. G is a sample brown rice.

FIG. 7 is a control block diagram. The CPU 57, which controls the operation of the rice polishing apparatus, has a product type designation signal at the time of receipt of goods, the damage detection camera detection signal, the product type selection switch signal at the start of rice polishing, and the amount of rice polished. Designated signal,
A whiteness degree designating signal, a designated coin or bill insertion signal, a weighing instrument signal, a proximity sensor 58 signal provided to know the rotational position of the brown rice tank 3, and the like are input. On the other hand, as output information, damage detection device 54 activation signal, rice milling machine, elevator, each motor output for rotating brown rice tank, etc., whitening degree adjusting / resistor plate opening / closing control motor output, thrower switching valve, first flow path Control motor forward / reverse output for cylinder switching valve, shutter for each discharge part of brown rice tank 3, shutter for weighing hopper, polished rice flow path switching valve, etc.

The CPU 57 mainly has the following functions.
That is, when receiving a cargo receipt signal (for example, by specifying a product type based on keyboard operation or outputting a brown rice tank 3 designation signal), a start signal is output to the damage detection device 54. Receiving the signal to specify the stake destination, it outputs a drive signal for shaving the brown rice.
For a predetermined number of grains, for example, 100 grains, the degree of damage, that is, the ratio of the damaged area to the area of each brown rice captured by the camera is calculated, and the average value Sm of the damage ratios is calculated from this distribution state, and the data is stored in the brown rice tank It is stored in the storage unit as a pair with the 3 number data. Damage ratio Sm in advance for each product type
And the degree of whitening Sh are set such that the higher the damage ratio, the higher the whitening degree and the lower the whitening degree (FIGS. 8 and 9), and output a forward / reverse rotation signal to the control motor 33. The relationship between the damage ratio and the degree of whitening is determined in consideration of the type, the degree of deterioration due to damage, the purpose of use, the time of whitening, etc., but priority is given to prevention of quality deterioration rather than yield. In response to the product type selection, the weighing instrument signal, the input charge signal, etc., it is determined whether or not the designated product type / weight meets the charge. When the conditions of (3) are satisfied, related device drive signals such as a payout signal from the designated brown rice tank 3 and a rice milling machine drive signal are output. Etc.

The operation of the above example will be described. Brown rice of different varieties is put into the receiving hopper 6 and stored separately in the main tank portion 15 of the brown rice tank 3 in advance. At this time, the damage detection device 54 is activated during the staking operation, the degree of damage of the sample brown rice is estimated by the above estimation method for each different product type, and stored in the storage unit together with the brown rice tank number.

The customer selects a desired product type from the display on the operation panel 44 and operates the switch 46. At the same time, the required amount and the desired whiteness are selected and the switches 47 and 48 are operated in the same manner. In accordance with these commands, the drive motor 19 is activated to rotate the rotary shaft 18 until the main tank portion 15 of the selected product reaches the upper portion of the weighing device 21. The opening / closing shutter 14 is opened, and the brown rice flows down into the weighing hopper 22 to weigh the set amount. A predetermined amount of brown rice is returned to the elevator 2 and lifted.
The switching valve 40 is switched to the supply side of the second flow path cylinder 9, and the unpolished rice is transferred to the rice polishing tank 24 side.

The milled rice drive motor 30 is activated to supply brown rice into the milled cylindrical body 28, and the milled rice from the discharge portion 29 is taken out through the milled rice passage 38. When the processing of brown rice in the rice polishing tank 24 is completed, the control motor 33 reverses while the rice polishing machine drive motor 19 remains in the activated state, for example, when the operation time corresponding to the processing amount elapses or the lower limit sensor provided in the rice polishing tank 24 is detected. When the discharging unit 29 is opened by opening the polishing unit 28, the polished cylindrical body 28 is inclined, so that substantially all the rice remaining inside is discharged. At this time, the white rice passage 38 is switched to the communication side of the branch passage 39, and the residual rice is lifted by the elevator 5. On the other hand, the switching valve 40 of the throwing port is switched to the state in which it can be supplied to the first flow channel cylinder 8 side, and the switching valve 11 of the flow channel cylinder 8 is changed.
In the spiral cylinder 20 side supply state, the remaining rice is guided and supplied and stored in the auxiliary tank 17 formed on the side portion of the main tank 15 that accommodates the initially selected variety.

In this way, the scheduled rice polishing work is completed, there is no residual rice in the white polishing cylinder 28, and there is no risk of mixing even if the variety selected by the user next time is different.
In the above case, the customer arbitrarily selected the desired whiteness,
When processing brown rice with a particularly high degree of damage, the CPU 57 preferentially performs whitening processing with a preset high whitening degree. Further, when the whitening degree designating switch 48 is not set from the beginning, the control motor 33 is driven so as to be in a preset whitening degree state.

In the above case, the case of selecting a single variety has been described, but if two or more types of brown rice are selected and the respective amounts are set, they are sequentially supplied in the rice polishing tank 24,
The rotation of the stirring and mixing helix 25 allows different types of brown rice to be uniformly mixed, and thereafter, polished rice is obtained through similar processing. It should be avoided as much as possible to carry out blending of the ones having extremely different damage levels, and the customer can display the damage status of the brown rice in the brown rice tank 3 on the operation panel 44 (see FIG. 10A). It is performed while checking the blending suitability by confirmation. When blending the ones whose damage degree is extremely different depending on the relations such as varieties, the milling degree is set to a high value according to the brown rice with a high damage degree, or both the damage degree and the damage degree preset by the CPU 57-whitening The determination may be made automatically based on the degree relationship graph (FIG. 9).

When the degree of damage is known, the storage limit of the brown rice tank 3 is determined, and it is possible to set a limit month or date on the display unit 59, which may be a basis for determining which brown rice to process. Become. An example of the display unit 59 is as shown in FIG. 10, but using a CRT screen, the brown rice tank NO. And the degree of damage are expressed. In addition, if the difference is such that blending can be done, the identification marks of the same shape are used for facilitation. The numbers are the room temperature storage limit months.

Items on the vertical axis are changed by operating a screen selection switch (not shown), and for example, internal components analyzed by a near infrared spectroscopic analyzer (not shown) are displayed. For example, in FIG. 10B, the protein content is expressed, and similarly, the identification mark having the same shape is used for the blendable range. In addition to the data shown in FIG. 10A, the data shown in FIG. 10B can be captured to predict an appropriate blend ratio.

[Brief description of drawings]

FIG. 1 is a sectional view of a damage detection device.

FIG. 2 is an overall front view with a partial cross section.

FIG. 3 is an overall plan view.

FIG. 4 is a sectional view of a rice polishing machine.

FIG. 5 is a sectional view of a part of a brown rice tank.

FIG. 6 is an overall front view.

FIG. 7 is a control block diagram.

FIG. 8 is a graph showing an example of a damage detection result frequency distribution.

FIG. 9 is a graph showing the relationship between damage degree and milling degree.

FIG. 10 is a diagram showing an example of a display.

[Explanation of symbols]

1 Building 2 Elevator 3
Brown rice tank 4 Rice milling machine 5 Dust collector 6
Receiving hopper 7 Throw-off cylinder frame 8 First flow path cylinder 9
Second flow channel cylinder 10 switching valve 11 switching valve 12
Partition member 13 Receiving port 14 Opening / closing shutter 15
Main tank 16 Partition 17 Auxiliary tank 18
Rotating shaft 19 Motor 20 Spiral cylinder 21
Scale 22 Hopper 24 Rice milling tank 27
Rotating shaft 28 White barrel 29 White rice discharging unit 30
Drive motor 31 Resistance plate 32 Spring 33
Control motor 38 White rice passage 39 Branch passage 40
Switching valve 44 Operation panel 45 Product type display unit 46
Variety selection switch 47 Rice polishing amount specification switch 48
Whiteness selection switch 49,50 Coin or banknote slot 54
Damage detection device 55 Single grain feeding unit 56 Camera detection unit 57
CPU 58 Proximity sensor

Claims (1)

[Claims] 1. A rice polishing method comprising measuring the degree of surface damage of brown rice to be whitened, and performing whitening treatment based on the relationship between the degree of damage and the degree of whitening preset from the measurement result.