WO2023090257A1

WO2023090257A1 - Device for manufacturing no-wash rice

Info

Publication number: WO2023090257A1
Application number: PCT/JP2022/041988
Authority: WO
Inventors: 悠希橋本; 尭杜東脇; 久石田
Original assignee: 株式会社サタケ; 株式会社エバートン
Priority date: 2021-11-18
Filing date: 2022-11-10
Publication date: 2023-05-25
Also published as: JP2023074742A

Abstract

This device 1 for manufacturing no-wash rice comprises at least a grain milling part 3 for mixing/stirring rice grains and water and performing underwater milling, wherein: the grain milling part 3 includes, from the upstream side of the grain milling part 3, a first added water conveying part, a first rice washing part, a suction dewatering part, a second added water conveying part, and a second rice washing part; and the second added water conveying part is supplied with bubble water.

Description

Rinse-free rice manufacturing equipment

The present invention relates to a wash-free rice manufacturing apparatus capable of manufacturing wash-free rice.

In the conventional wash-free rice manufacturing apparatus, as disclosed in Patent Document 1, between the primary rice-washing section and the secondary rice-washing section and between the secondary rice-washing section and the tertiary rice-washing section There was one that provided a drainage port and was able to wash rice three times.

Patent Document 2 discloses a wash-free grain manufacturing apparatus capable of producing wash-free rice by passing the washed rice through a centrifugal dehydrator.

Patent Document 3 discloses an invention of a rice washing method in which fine air bubbles, rice washing water, and polished rice grains are mixed and flowed in a pipe to wash the rice.

JP-A-2002-159869 JP 2019-209242 A Japanese Patent Application Laid-Open No. 2018-111098

However, in the case of the rinse-free rice production apparatus described in Patent Document 1, it is difficult to sufficiently drain the rice-washing water mixed with the rice grains and the bran through the drainage ports because the time for the rice grains to pass over the drainage ports is short. . Therefore, even if rice-washing water is newly supplied in each subsequent rice-washing step, rice-washing water mixed with bran always remains. In addition, in the above-described rice washing process, the rice is washed by rubbing the rice grains together, so the bran acts as an abrasive and causes small scratches on the surface of the rice grains when the rice is washed and stirred. As a result, there was a concern about the quality of the rice, as the rice cracked during cooking (underwater cracks) and the internal starch flowed out, resulting in soft rice.

In the non-rinsing grain manufacturing apparatus described in Patent Document 2, a polishing unit (rice washing unit) for mixing and agitating grains (rice) with water and polishing in water, and a centrifugal dehydration unit in the subsequent process. It was used to produce rinse-free rice, but the washing action was weak because the rice was washed only once. In the rice washing device disclosed in Patent Document 3, since the rice grains come into contact with and collide with the element when flowing and reversing in the piping, there is a risk of damage to the rice grains, which leaves concerns about the quality of the cooked rice. there were.

Therefore, in view of the above problems, it is an object of the present invention to provide a rinse-free rice manufacturing apparatus capable of improving the washing effect and improving the quality of rinse-free rice.

An embodiment of the present invention is a rinse-free rice manufacturing apparatus comprising at least a polishing section for mixing and agitating rice grains and water and polishing them in water, wherein the polishing section transports the first water from the upstream side of the polishing section. , a first rice washing section, a suction dewatering section, a second water feeding section, and a second rice washing section, and the second water feeding section is supplied with bubbly water.

Another embodiment has a centrifugal dewatering unit capable of dehydrating the rice grains discharged from the second rice washing unit, and the recovered water collected in the centrifugal dewatering unit is supplied to the first water transfer unit. This is a wash-free rice manufacturing device that

In another embodiment, the water supplied to the second water supply conveying part is added in an amount of 6 to 24% by weight with respect to the weight of the rice grains supplied to the second water supply conveying part. It is a device.

According to the embodiment of the present invention, by configuring the polishing section from the upstream side with the first hydration conveying section, the first rice washing section, the suction dehydration section, the second hydration conveying section, and the second rice washing section, for example, the first The water mixed with rice bran used in the rice washing section can be completely removed by the forced action in the suction dehydration section. Furthermore, in the second water-replenishing conveying section in the next step, bubbled water is added to new clean water without contamination with the water mixed with rice bran in the previous step, so that the rice can be washed in the second rice-washing section. As a result, the washing effect is improved, and turbidity and whiteness can be improved. In addition, the air bubbles soften the impact between the rice grains, preventing damage to the surface of the rice grains that leads to cracks in the water, and improving the quality of cooked rice. becomes.

1 is an overall schematic perspective view of a rinse-free rice manufacturing apparatus in an embodiment of the present invention; FIG. Fig. 2 is a partially enlarged front view of the rinse-free rice manufacturing apparatus in the embodiment; Fig. 2 is a perspective view of a polishing section in the rinse-free rice manufacturing apparatus; Fig. 3 is an enlarged perspective view of a suction dewatering unit in the rinse-free rice manufacturing apparatus; It is the figure which showed the connection aspect of the bubble water manufacturing apparatus and the polishing part in an Example.

An embodiment of the rinse-free rice manufacturing apparatus of the present invention will be described below. FIG. 1 is an overall schematic perspective view of the rinse-free rice manufacturing apparatus 1 in this embodiment, and FIG. Illustrated. Further, FIG. 5 shows the configuration of a bubbled water production device 70 capable of supplying bubbled water to the polishing section 3 .

As illustrated, the rinse-free rice manufacturing apparatus 1 of this embodiment is placed on the machine frame 2 . The rinse-free rice manufacturing apparatus 1 also includes a polishing unit 3 for mixing and agitating the supplied polished rice with water and polishing it in water, a polished rice supply device 4 for supplying the polished rice to the polishing unit 3, and the polishing unit. The main part is constituted by a dehydrator 5 capable of centrifugally dehydrating the rice grains discharged from 3, and a moisture adjusting unit 6 for adjusting the moisture content.

The polishing section 3 includes a rotatable polishing shaft 8 in a horizontal cylindrical polishing cylinder 7 and a conveying screw 9 attached to the polishing shaft 8 . The polishing part 3 has a plurality of stirring blades 10 fixed thereto and a stirring roller 11 axially attached to the polishing shaft 8, and the rice grains flow out from the end side of the polishing cylinder 7 which is axially attached to the polishing shaft 8. It also has a regulating member 12 for regulating.

The regulating member 12 described above is preferably a brim-shaped member. It is preferable to regulate the outflow of grains.

As shown in FIG. 1, a driving pulley 13 for rotational driving is attached to the rear end (left end in the figure) of the polishing shaft 8, and the polishing shaft 8 is rotated above the driving pulley 13. A motor 14 is installed for driving. A transmission belt (not shown) is wound between the motor pulley 15 of the motor 14 and the driving pulley 13 of the polishing shaft 8 so that the rotational force of the motor 14 can be transmitted to the polishing shaft 8 .

As shown in FIG. 2, the dewatering unit 5 includes a vertical rotatable dewatering cylinder 18 partly formed of a porous wall 17 and a dewatering shaft 19 rotatably supported in the dewatering cylinder 18 . , and a dewatering screw 20 attached to the dewatering shaft 19 . A drainage cover 21 and a drain gutter 22 are provided around the perforated wall 17 of the dehydration cylinder 18, and the centrifugal force caused by the rotation of the dehydration screw 20 and the rotation of the dehydration cylinder 18 cleans the porous wall 17. of water is discharged.

A motor 23 having a plurality of output shafts for rotating the dehydration shaft 19 and the dehydration cylinder 18 is installed on the side of the dehydration section 5 . A drive pulley 24 for rotating the dehydration shaft 19 is provided at the upper end of the dehydration shaft 19, and a pulley groove 25 is provided in the circumferential surface of the dehydration cylinder 18 near the center in the axial direction.

That is, the first transmission belt 27 is wound between the driving pulley 24 and the first motor pulley 26 of the motor 23 so that the rotational force of the first motor pulley 26 can be transmitted to the dewatering shaft 19 . Furthermore, a second transmission belt 29 is wound between the pulley groove 25 and the second motor pulley 28 of the motor 23 so that the rotational force of the second motor pulley 28 can be transmitted to the dewatering cylinder 18 .

At the lower end of the dewatering shaft 19 of the dewatering unit 5, a scraping blade (not shown) for throwing the rice grains into the moisture adjusting unit 6 is attached so that the rice grains can be thrown into the moisture adjusting unit 6 while being diffused. The dewatering section 5 and the moisture adjusting section 6 are connected by a flow down trough 31 having a gentle circular arc in longitudinal section, and together with the raking blades, the dewatered rice grains are diffused while being dispersed in the moisture adjusting section 6. can be put into

As shown in FIG. 1, the moisture adjusting unit 6 vibrates rice grains with a vibrating motor 37, refines and dries them with a hot air supply fan 38 with a built-in heater, and heats the rice grains through a refined product duct (not shown). can be discharged out of the machine as rinse-free rice.

Next, the process of manufacturing rinse-free rice in the rinse-free rice manufacturing apparatus 1 will be described in detail, especially with reference to FIGS. 2 to 5.

Polished rice as a raw material supplied from a raw material supply chute 50 (see FIG. 1) is quantitatively supplied to a rice grain charging hopper 42 through a passage 52 by a rotary valve 51 (see section A in FIG. 2) in the polished rice supply device 4. be done. Then, rice grains are thrown into the polishing barrel 7 through a rice grain inlet 41 provided on the starting end side (left side in the drawing) of the polishing barrel 7 .

As shown in FIG. 2, the polishing section 3 of the present embodiment includes, in order from the upstream side (left side in the drawing), a first water-addition conveying section B, a first rice-washing section C, a suction dehydration section D, a second water-addition conveying section E, The rice grains discharged from the second rice washing section F and the polishing section 3 are conveyed to the centrifugal dewatering section G on the downstream side.

The rice grains put into the milling cylinder 7 are first conveyed to the first water conveying section B. As shown in FIGS. 2, 3, etc., the first water supply nozzle 44 is provided in the first water supply conveying part B at a position downstream of the rice grain input port 41, and water is supplied from the first water supply nozzle 44. At the same time, the rice grains input from the rice grain input port 41 are conveyed downstream (right side in the drawing) by the conveying screw 9 .

The amount of water added by the first water supply nozzle 44 can be, for example, 6 to 24% by weight (wt%) with respect to the weight of rice grains to be fed. Further, in this embodiment, the recovered water recovered by the centrifugal dehydrator G is supplied to the first water supply nozzle 44 to reuse the water. Of course, it is also possible to supply fresh water without using recovered water.

Next, the rice grains that have been watered in the first hydrating conveying section B and conveyed by the conveying screw 9 are conveyed to the first rice washing section C. As described above, the first rice-washing section C is provided with a plurality of stirring blades 10 (in the illustrated example, arranged at two locations, 12 o'clock and 6 o'clock). As a result, the rice grains added with water in the first water feeding section B are agitated and washed in the first rice washing section C.

In the rice washing process in the first rice washing section C, the bran content generated by stirring and washing the rice is dispersed in the water, and polishing is also performed by the friction between the grains in the water. At this time, when the degree of polishing progresses by 0.5 to 2.0% with respect to the rice grain, the aleurone layer on the surface of the rice grain is peeled off.

Subsequently, the rice grains stirred and washed in the first rice washing section C are transported to the suction dehydration section D on the downstream side (on the right side in the drawing). A suction fan (not shown) is connected to the suction dewatering unit D, and a drain pipe 60 for draining the sucked water is connected. The sugar-mixed water generated in the first rice washing section C is sucked from the rice grains and discharged to the outside of the machine through the drain pipe 60 .

More specifically, the polishing shaft 8 and the stirring roller 11 in the vicinity of the stirring blades 10 of the suction dewatering section D are provided with vent holes 61 as shown in the enlarged perspective view of FIG. That is, the polished shaft 8 has a hollow structure and communicates with the outside air, and communicates with the ventilation hole 61 . As a result, outside air is taken into the suction dewatering section D at the time of suction, making it possible to suck sugar-mixed water.

Subsequently, the rice grains dehydrated in the suction dewatering section D are conveyed to the second hydration conveying section E on the downstream side (right side in the drawing). A second water supply nozzle 45 and a bubbly water supply nozzle 46 are connected to the second water supply conveying part E, respectively, as shown in the figure. It is configured to be conveyed by the conveying screw 9 together with it.

More specifically, in this embodiment, as shown in FIG. 5, a bubbly water producing device 70 is provided, and the bubbly water producing device 70 is provided with a bubble generating device 72 in a water tank 71 to generate bubbly water. manufacturing. The produced bubbly water is configured to be supplied from the bubbly water supply nozzle 46 to the second water transfer unit E via the pump 73 and the control valve 74 . The second water supply nozzle 45 is used to supply water to the inside of the rinse-free rice manufacturing apparatus 1 when washing the rinse-free rice manufacturing apparatus 1 .

By adding air bubble water as described above, the rice grains are agitated and polished, and the bubbles are further miniaturized by the polishing action and penetrate deep into the surface of the rice grains. In addition, it is possible to promote the detachment of the bran deep inside the surface details of the rice grains, thereby improving the quality such as whiteness and turbidity. In addition, while removing the bran on the surface of the rice grain, it is possible to leave the "umami component" at the boundary with the starch layer without removing it, so that the taste can be improved more than before. In addition, the air bubbles soften the impact between the rice grains and prevent damage to the surface of the rice grains, which can lead to cracks in the water. can do.

Fine bubble water is preferable as the bubble water, and it is more preferable to use ultra-fine bubble (registered trademark) water with a bubble diameter of 1 μm or less. In this case, it is preferable to add 6 to 15% of the normal water supplied to the second water supply conveying section E.

A ring-shaped backflow prevention partition 62 is formed on the outer periphery of the stirring rotor 11 between the suction dehydration section D and the second hydration transfer section E, as shown in FIG. This effectively prevents sugar-mixed water from entering the second hydration conveying section E from the suction dehydrating section D. As shown in FIG.

The rice grains that have been watered and conveyed by the second water supply conveying section E are conveyed to the second rice washing section F on the downstream side (on the right side in the drawing). As shown in FIG. 3 and the like, the second rice-washing section F is provided with a plurality of stirring blades 10 (arranged at two locations, 12 o'clock and 6 o'clock in the illustrated example). That is, since a small amount of bran remains on the surface of the rice grains dehydrated in the suction dewatering section D, clean water is supplied in the second water supply conveying section E, and rinsing is performed in the second rice washing section F.

However, if the rice grains are washed strongly in the second rice-washing part F, the taste of the cooked rice deteriorates. It reduces the strength of rice washing. In this way, the rice is washed strongly in the first rice-washing section C and weakly washed in the second rice-washing section F, so that the collected water discharged and collected in the centrifugal dehydration section G on the downstream side contains rice bran, etc. less fine substances. By doing so, clean recovered water can be supplied by the first water supply nozzle 44, and the rice washing effect in the first rice washing section C and the dewatering effect in the suction dewatering section D can be improved.

At the end of the polishing shaft 8 at the end of the second rice washing section F, a regulating member 12 is attached to the polishing shaft 8, as shown in FIGS. The restricting member 12 has an outer diameter close to the inner diameter of the milling cylinder 7 to narrow the gap, and restricts the outflow of rice grains from the milling cylinder 7 . The gap between the inner diameter of the polishing cylinder 7 and the outer diameter of the regulating member 12 in this embodiment is about 5 to 13 mm. With such a gap size, the rice grains can be conveyed to the centrifugal dehydrator G while controlling the outflow of the rice grains from the polishing cylinder 7 . Also, by restricting the outflow of rice grains, it is possible to increase the intensity of washing the rice. Thereby, the rice washing efficiency can be improved. In addition, by narrowing the inlet to the dewatering unit 5, the outflow of rice grains is further restricted.

Next, the rice grains conveyed from the second rice washing section F are conveyed to the dehydrating cylinder 18 of the dehydrating section 5 and conveyed to the centrifugal dehydrating section G as shown in FIG. In the centrifugal dewatering section G, the rice grains and water are transported vertically by the rotation of the dewatering screw 20 (for example, 1700 rpm). At this time, the rice grains and water are separated into rice grains and water at the perforated wall 17 of the dewatering cylinder 18 while being transferred, under the effect of centrifugal force due to the rotation of the dewatering cylinder 18 (eg, 2000 rpm).

Then, the separated water is recovered through the drainage cover 21 and the drainage gutter 22, and supplied to the first water supply nozzle 44 of the first water supply conveying section B as described above, and the recovered water is reused. On the other hand, the dehydrated rice grains are scraped out of the dehydration cylinder 18 by scraping blades (not shown) at the lower end of the dehydration shaft 19 and thrown into the moisture adjusting section 6 via the downflow trough 31 .

In the moisture adjusting unit 6, the rice grains are rolled by the vibration motor 37, hot air is supplied from the hot air supply fan 38, and the rice grains are rolled and exposed to the hot air, thereby being tempered and dried. is done. Wash-free rice with a water content of less than 15%, for example, is discharged from a refined product duct (not shown).

(another example)
Although the rinse-free rice manufacturing apparatus 1 of the present embodiment has been described above, the rinse-free rice manufacturing apparatus of the present invention is not necessarily limited to the above-described embodiments.

In the above-described example, the stirring blades 10 provided in the first rice washing section C, the suction dehydration section D, and the second rice washing section F were arranged at two positions in the direction of 12 o'clock and 6 o'clock with respect to the polishing shaft 8 . However, it is not necessarily limited to such an arrangement mode, and the stirring blades 10 may be provided at a plurality of locations, or the stirring blades 10 may be divided into a plurality of parts in the axial direction of the polishing shaft 8 and arranged. is also possible. As a result, the internal resistance in the polishing section 3 can be adjusted, and the degree of washing and rinsing can be adjusted.

For example, by making the arrangement configuration of the stirring blades 10 of the first rice washing section C and/or the suction dewatering section D different from the arrangement configuration of the stirring blades 10 provided in the second rice washing section F, the second rice washing section on the downstream side The internal resistance at F can be lowered. As a result, it is possible to actively wash the rice in the first rice-washing section C on the upstream side and wash the rice in the second rice-washing section F on the downstream side, which also serves as rinsing. It works better.

Also, in the above-described embodiment, the rinse-free rice manufacturing apparatus 1 using the bubble water manufacturing apparatus 70 has been described, but the present invention is not limited to this. For example, fine bubbles may be enjoyed by installing a commercially available nozzle responsible for bubble generation inline with the bubble water supply nozzle 46 .

Although the embodiments and other embodiments of the present invention have been described above, these descriptions are intended to facilitate understanding of the present invention and are not intended to limit the present invention. The present invention may be modified and improved without departing from its spirit, and the present invention includes equivalents thereof. Further, within the range that at least part of the above problems can be solved or at least part of the effects achieved, the components described in the scope of claims and the specification can be combined or omitted.

1 Wash-free rice production device 2 Machine frame 3 Polishing unit 4 Polished rice supply device 5 Dewatering unit 6 Moisture adjustment unit 7 Polishing cylinder 8 Polishing shaft 9 Conveying screw 10 Stirring vane 11 Stirring roller 12 Regulating member 13 Driving pulley 14 Motor 15 Motor pulley 16 Transmission belt 17 Porous wall 18 Dehydration cylinder 19 Dehydration shaft 20 Dehydration screw 21 Drainage cover 22 Drainage gutter 23 Motor 24 Drive pulley 25 Pulley groove 26 First motor pulley 27 First transmission belt 28 Second motor pulley 29 Second transmission belt 31 Drainage gutter 37 Vibration motor 38 Hot air supply fan 41 Rice grain inlet 42 Rice grain introduction hopper 44 First water supply nozzle 45 Second water supply nozzle 46 Bubble water supply nozzle 50 Raw material supply chute 51 Rotary valve 52 Passage 61 Ventilation hole 62 Backflow prevention partition 70 Bubble water production device 71 water tank 72 bubble generator 73 pump 74 control valve

Claims

A rinse-free rice manufacturing apparatus comprising at least a polishing part for mixing and stirring rice grains and water and polishing them in water,
The polishing section is composed of, from the upstream side of the polishing section, a first hydration conveying section, a first rice washing section, a suction dehydration section, a second hydration conveying section, and a second rice washing section,
The rinse-free rice manufacturing apparatus is characterized in that bubbly water is supplied to the second water supply conveying unit.
Having a centrifugal dewatering unit capable of dehydrating the rice grains discharged from the second rice washing unit,
The rinse-free rice manufacturing apparatus according to claim 1, wherein the recovered water recovered in the centrifugal dehydration section is supplied to the first water transfer section.
The water supplied to the second water supply conveying unit is added in an amount of 6 to 24% by weight with respect to the weight of the rice grains supplied to the second water supply conveying unit. Washed rice manufacturing equipment.