JP2001029802A - Wash-free rice production apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive wash-free rice production apparatus of a small size and water saving type. SOLUTION: This apparatus comprises a rice polishing section 10 which has a rice polishing roll 20 for polishing milled rice by pressure agitation together with polishing water, a dehydrating section 38 which has a centrifugal dehydrating cylinder 43 for dehydrating the milled rice supplied from the rice polishing section 10 and a drying section 61 having a drying disk 66 for drying the milled rice supplied from the dehydrating section 38. In such a case, the respective centers of rotation of the centrifugal dehydrating cylinder 43 and the drying disk 66 are arranged on the same vertical central line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-washed rice producing apparatus, and more particularly to a so-called "non-washed rice" which does not require rice washing prior to cooking, can be cooked only by adding water, and has good preservability. The present invention relates to an apparatus for producing rice without washing.

[0002]

2. Description of the Related Art When polished rice is washed in a normal manner, water penetrates into the polished rice and raises the moisture content, which tends to cause mold and decay, resulting in unwashed rice that can be handled like ordinary polished rice. Can not be. Then, if it is necessary to dry the milled rice once having a high moisture content by washing with water, the starch layer of the milled rice has the property of expanding when absorbing water and shrinking when dried (Japanese Patent Publication No. 3-36496). Etc.), only the surface layer of the polished rice shrinks sharply during drying, and a tensile force acts on the surface layer to generate cracks. A milled rice with cracks is unevenly swelled due to a large amount of water entering from cracks during cooking, or a large amount of starch particles are eluted from cracks, resulting in rice with a very poor taste and extremely poor taste. Is well known.

[0003] Therefore, by washing with water in a very short time when water hardly enters the inside of the polished rice and immediately removing the water adhering to the surface of the polished rice, unwashed rice which is easy to store and has good taste can be obtained. Techniques for obtaining the same have been proposed in JP-A-2-242647 and JP-A-3-154643. Since these techniques do not dry polished rice once having a high moisture content to lower the moisture content, it can theoretically produce crack-free rice without cracks.

[0004] However, depending on the temperature of the washing water and the properties of the polished rice as a raw material, the polished rice can be removed within a short time so that the water entering the polished rice stays within or outside 1% by weight of the polished rice. It cannot be said that it is difficult to perform the washing with water and the removal of the water adhering to the surface by using a known rice washing device or a dehydration (evaporation and drying) device.

[0005] If cooked rice is not washed, the rice will have a rice bran odor, the color of the rice will be yellow, or the rice will not be sticky.
An extremely viscous semi-liquid mixture (hereinafter referred to as ariuron residue) consisting of oils, fats, proteins, and carbohydrates contained in the ariuron layer (paste layer), which is the lowermost layer of brown rice bran layer, is polished rice The main cause is that the ariuron residue adheres to the surface of the rice (see Japanese Patent Application Laid-Open No. 3-154643). In order to make the rice without washing good in taste, the ariuron residue must be almost completely removed. By the way, the ariuron residue is difficult to release from the polished rice by simply washing the polished rice due to its high viscosity.To release it, immerse the polished rice in water and rub the surface of the polished rice. is necessary. However, polished rice loses its strength when it absorbs water, and in particular, its surface cell tissue is easily damaged, and if it is damaged, it will have the same adverse taste effect as cracks. Applying power is forbidden. Therefore, the conventional rice washing equipment uses the method (rotating the stirring blades in the washing tank to stir the water and the milled rice, putting the water and the milled rice into the washing tank with the blades fixed inside and rotating the washing tank itself. Irrespective of the method of stirring the polished rice and water while transporting the polished rice by a screw conveyor, and stirring by injecting a strong water or air stream into the polished rice in the water). The frictional force applied to the polished rice is reduced so that the rice is not damaged or cracked, and instead, the cleaning is performed for a relatively long time so that sufficient cleaning can be performed. Therefore, it is almost impossible to remove the ariuron residue almost completely in such a short time as is suitable for rice-free rice production using such a rice washing apparatus.

A known device for removing adhering water is a centrifugal dewatering machine or a net conveyor (evaporating the adhering water by wind). It takes more time to dewater the polished rice from the point of time when the amount of polished rice is about 3% by weight or less, which causes excessive infiltration of adhered water into the polished rice. On the other hand, in the net conveyor, it is difficult to make the air evenly contact the whole surface of the polished rice, and some grains of the polished rice, or some parts of one polished rice become over-dried, There is a high risk of so-called uneven drying and cracking. In order to prevent this, it seems that the polished rice should be evaporated while rolling, but this would damage the tissue of the polished rice surface layer softened by water absorption.

As described above, Japanese Patent Application Laid-Open No. 2-242
No. 647 does not disclose an apparatus capable of cleaning the polished rice and removing adhering water, and also discloses an apparatus for producing unwashed rice disclosed in JP-A-3-154643. Therefore, it is considered possible to manufacture rice without washing, but there is room for further improvement in order to stably produce high-quality rice without washing regardless of the conditions such as the temperature of washing water and the relative humidity of the atmosphere. There is.

Japanese Patent Application Laid-Open No. 5-192594 discloses a method for solving the above-mentioned problems, in which washing water is added to the polished rice by a pressurizing and stirring means and the surface of the polished rice is rubbed while applying relatively high pressure. After effectively removing the substances to be removed, such as ariuron residues, and dissolving or suspending them in the washing water, the rice is centrifuged and dewatered by applying rinsing water to the polished rice in the rinsing and dewatering means. There has been proposed a non-washing rice production apparatus in which the attached washing water is removed, and further, the attached water on the surface of the polished rice slightly remaining at the time of being discharged from the rinsing and dewatering means is evaporated by an evaporating means.

[0009]

However, in these conventional non-washed rice producing apparatuses, since the washing section, the dehydrating section, the drying section, etc. are separately arranged for each section, the connecting means between each section and the polished rice are used. There has been a problem that the transporting means becomes complicated and the entire apparatus becomes large and expensive.

[0010] Further, since the polished rice transport means requires a large amount of transport water sufficient to flush out the polished rice, not only the cost of water supply increases but also a large amount of polluted water (sharpening juice) is discharged. Therefore, there is a problem that the installation of a considerably large and expensive water purification device is obliged under the pollution prevention regulations.

The present invention has been made to solve the above problems, and has as its object to provide a small, water-saving and inexpensive rice-free rice producing apparatus.

[0012]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a fryer spiral for conveying polished rice from below to above, a pouring water inlet provided on the head, and Provided with an outlet for the milled rice, and a milling rice roll for stirring and milling the milled rice pressurized by the conveying of the frying spiral together with the sharpening water poured from the water inlet, A dewatering unit that discharges polished rice that has been polished rice from the outlet, and a dewatering unit that includes a centrifugal dewatering cylinder that dewaters the polished rice supplied from the polished rice unit while transporting the polished rice from below to above. Drying section with a drying disk for drying the milled rice supplied from the section,
And the center of rotation of the polishing rice roll, the centrifugal dewatering cylinder, and the drying disk are arranged on the same vertical center line.

In the present invention, the polished rice is transported upward from the bottom by a spiraling mill in the polishing rice section, and the polished rice is pressurized by this transport. The pressurized polished rice is stirred by the rotating polished rice roll together with the sharpening water poured from the water inlet of the head to perform polished rice processing, and the surface of the polished rice is rubbed. By this polishing rice treatment, the removal target such as the ariuron residue is released from the surface of the polished rice and dissolved in the sharpening water. The polished rice is discharged from the outlet of the head by centrifugal force and natural fall.

The polished rice discharged from the polishing rice unit is supplied to the dewatering unit, and is dewatered together with the sharpening water by a rotating centrifugal dewatering cylinder that is conveyed upward from below. The dewatered polished rice is discharged from above the dewatering unit by centrifugal force and free fall.

The polished rice discharged from the dewatering section is supplied to the drying section, and is dried by the rotating drying disk to become unwashed rice.

As described above, in the present invention, the rice polishing unit, the dewatering unit, and the drying unit are vertically arranged, and their rotational centers (the rotational centers of the polishing rice roll, the centrifugal dewatering cylinder, and the drying disk) are the same. Since they are arranged on the vertical center line, the connecting means between each part and the means for transporting the polished rice can be simplified, and the whole apparatus can be reduced in size and cost. In addition, since the milled rice can be transported by centrifugal force and natural fall, transport water for transporting the milled rice is not required, so that not only the cost of water supply is reduced, but also of the polluted water (sharpening juice). A simple water purification device can be installed with little discharge, and a water-saving type inexpensive device can be obtained.

Furthermore, in the polishing rice section of the present invention, the sharpening water is poured from the water inlet of the head and flows down naturally from top to bottom, and the polished rice flows from bottom to top in the opposite direction to the sharpening water by a milling spiral. And discharged from the head outlet. For this reason, in the last stage of rice polishing (upper part of rice polishing roll), rice is polished with pure water poured from the head, and the first stage of rice polishing (lower part of rice polishing roll) In this case, water contaminated by the rice polishing process at the last stage is used, and pure water is gradually used as the rice polishing process progresses. it can. In this way, the first stage of the rice polishing process uses dirty water, gradually uses pure water as the rice polishing process progresses, and uses pure water in the final finishing stage of the rice polishing process. There is no need to pour fresh rinse water, and a small amount of water can be used to perform pretreatment for producing good-tasting unwashed rice.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings.

The machine frame 15 of the rice-free rice production apparatus according to the present embodiment has an upper mount 17, a middle mount 13, and a lower mount 19 parallel to each other inside, and a cover 1 outside.
1 is provided.

The rice polishing unit 10 of the apparatus for producing rice without washing is arranged on the central vertical center line A from the middle position to the lower position in the machine frame 15 and has a cylindrical rice polishing tube 18. I have. The polishing rice cylinder 18 has its central axis set up on the vertical center line A, and has its legs fixed to the lower mounting base 19.

A supply port 12 for milled rice communicating with the inside of the polishing rice cylinder 18 is formed in the side wall of the polishing rice cylinder 18 leg, and is supplied from a hopper 30 opened above the machine frame 15. A screw feeder 32 for conveying the polished rice is provided. 34 is a supply motor for the screw feeder 32.

A rotating shaft 23 is housed inside the polishing rice cylinder 18. The rotation shaft 23 has an upper end protruding from an opening of the head of the rice-grinding cylinder 18 and a lower end protruding from an opening of the leg of the rice-grinding cylinder 18. Have been. A pulley 29 is fixed to a portion of the rotating shaft 23 protruding from the rice-grinding cylinder 18 leg. The pulley 29 is connected to a pulley 33 fixed to the rotating shaft of the polishing rice motor 24 via a belt 31. Have been.

A screw blade 20a for conveying the polished rice supplied to the lower part of the polishing rice cylinder 18 from below to above is formed on the outer periphery of the rotating shaft 23 in the polishing rice cylinder 18 below, and a hoisting spiral 26 is formed. It is configured. The portion of the rice milling cylinder 18 surrounding the helix spiral 26 is formed in a cylindrical shape, and the helix spiral 26 and the rice milling cylinder 1 are formed.
8 and a frying room 25 is formed. In addition, the outer periphery of the rotating shaft 23 in the polishing rice cylinder 18 is
A plurality of plate-shaped ridges 20b are formed radially around the rotation shaft 23 in parallel with the axis 3 (rotation center) of the polishing rice roll 20.
The polishing rice roll 20 has an axis (rotation center).
Are erected on the vertical center line A. The portion of the polishing rice cylinder 18 surrounding the polishing rice roll 20 is formed in a cylindrical shape having a polygonal (for example, hexagonal) side surface in order to provide resistance to and agitate the polished rice. A polishing rice room 21 is formed between the polishing rice cylinder 18.

At the center of the rotary shaft 23, a water supply hole 28 for supplying sharpening water from outside the rice polishing unit 10 is formed from the upper end to the upper side of the ridge 20b.
The water supply hole 28 communicates with a plurality of water inlets 28 a radially formed on the upper side of the ridge 20 b forming portion of the polishing rice roll 20 so as to reach the polishing rice room 21. Rotary axis 2
The upper end of 3 is connected to a water supply tank (not shown) via a connector 35 that connects the rotating shaft 23 as a rotating portion and a pipe 37 as a fixed portion in a sealed state, thereby providing water. The hole 28 is connected to a water supply tank (not shown) via a pipe 37. For this reason, sharpening water is poured from the water supply hole 28 provided in the head of the polishing rice unit 10 to the polishing rice room 21 via the water inlet 28a. In the present invention, the polishing rice unit 10
Since the sharpening water only needs to be poured from the head, the water supply hole 28 may be formed by penetrating the upper wall or the side wall of the head of the polishing rice cylinder 18.

A drain port 18a having a plurality of holes for draining dirty sharpening water (sharpening juice) containing ariuron residue is formed in the side wall of the grinding rice cylinder 18 leg. The rice-grinding cylinder 18 is attached to the leg of the rice-grinding cylinder 18 so as to cover the outlet 18a.
One end of a discharge pipe 39 provided in a horizontal direction from the outside to the machine frame 15 is fixed, and the above-mentioned dirty sharpening water (sharpening juice) is discharged through the discharge pipe 39.

The head of the polishing rice cylinder 18 (the head of the polishing rice unit 10) communicates with the polishing rice room 21 inside the polishing rice cylinder 18 and discharges the polished rice. An outlet 18b is formed. A pressure valve 18c that closes the discharge port 18b in a normal state and opens the discharge port 18b with an opening corresponding to the pressure applied when a pressure equal to or more than a predetermined value is applied to the discharge port 18b can be opened and closed. Is provided. The pressure valve 18c can adjust the opening pressure arbitrarily. The polished rice that has been subjected to the rice polishing treatment and discharged from the discharge port 18b is supplied to the dewatering unit 38.

The dewatering section 38 extends from the upper part to the middle part in the machine casing 15 and the lower part is the outer periphery (the rice cylinder 1) above the rice polishing section 10.
8), a centrifugal dewatering cylinder 43 whose axis (center of rotation) is erected on the vertical center line A, and an outer casing 36 erected to surround the centrifugal dehydrating cylinder 43. It is configured. The centrifugal dehydrating cylinder 43 is a dehydrating inner cylinder 5 having an open upper part.
6 and a dewatering outer cylinder 44, and a dehydration chamber 55 having an open upper part is formed between the dehydration inner cylinder 56 and the dehydration outer cylinder 44.

A large number of blowing holes 56a are formed on the peripheral surface on the upper side of the dewatering inner cylinder 56, and a screw blade 54 for raising the milled rice is stretched on the peripheral surface. The upper end of the dewatering inner cylinder 56 is opened to serve as an air inlet, and a blowing chamber 45 is formed in a hollow portion of the dewatering inner cylinder 56.

A cylindrical shaft 56b whose axis (center of rotation) stands upright on the vertical center line A is formed below the dewatering inner cylinder 56. The dehydration inner cylinder 56 has a substantially middle portion in the axial direction and a cylindrical shaft. 5
6b Polished rice cylinder 1 fixed on lower mounting base 19 at lower end
8 is rotatably supported by the polishing rice cylinder 18 in a state surrounding the same. The cylindrical shaft 56b is connected to a pulley (not shown) of the motor via a belt.

A plurality of transfer ports 56c for polished rice are formed on the peripheral surface of a substantially middle portion in the axial direction of the dewatering inner cylinder 56. The polished rice supplied from the discharge port 18b of the polishing rice unit 10 is It is transferred to the lower part of the dehydration chamber 55 through the transfer port 56c by centrifugal force.

The dewatering outer cylinder 44 has a large number of discharge holes 44a for drainage / discharge on the peripheral surface, and discharge rice holes 44b at a plurality of locations on the upper peripheral surface. Dehydration outer cylinder 4
A cylindrical shaft 44c is fixed to the lower end of the cylinder 4. Cylindrical shaft 44
“c” is rotatably supported by the polishing rice cylinder 18 fixed on the lower mounting base 19 via the dehydration inner cylinder 56 in a state surrounding the cylindrical shaft 56b of the dehydration inner cylinder 56. The cylindrical shaft 44c is connected to a pulley (not shown) of the motor via a belt.

The outer cylinder 36 is formed in a tubular shape with an open upper end, and the lower end is fixed to the middle mount 13. Shell 3
The drain pipe 60 for drainage / exhaust is connected to the side wall at the lower end of the pipe 6, and the discharge pipe 60 is connected to the discharge pipe 39. The dehydrated polished rice is discharged from the polished rice discharge port 44b and supplied to the drying unit 61.

The drying unit 61 is disposed above the dewatering unit 38 at a higher position in the machine frame 15, and includes a drying disk 66 whose axis (center of rotation) is erected on the vertical center line A; The drying cylinder 62 is provided so as to surround the drying disk 66.

The drying disk 66 has a large number of ventilation holes 6
6a is formed, and a cylindrical shaft 66b is formed at the lower center. The cylindrical shaft 66b is rotatably supported by a bearing base 70 fixed on the upper mounting base 17 so as to surround the dewatering outer cylinder 44. The cylindrical shaft 66b is connected to a motor sprocket (not shown) through a chain. The cylindrical shaft 66b is disposed on the inner peripheral side of the outer casing 36 of the dewatering unit 38.

The drying cylinder 62 has a lower end fixed to the upper mount 17 and a top plate 63 formed with a plurality of ventilation windows 62a. A drying chamber 61a is formed between the drying disk 66 and the top plate 63, and a suction chamber 61b is formed between the drying disk 66 and the upper mount 17.

The drying chamber 61a communicates with the discharge port 44b of the dewatering section 38 so that the milled rice discharged from the discharge port 44b is gradually moved from the center to the outer periphery by the rotation of the drying disk 66. A plurality of guide plates 72 are provided along a tangential direction of the dewatering outer cylinder 44. This guide plate 7
2 is attached to the top plate 63 in a state of lightly contacting the surface of the drying disk 66. A discharge gutter 74 is provided on a side surface of the drying cylinder 62 corresponding to the guide plate 72 of the drying chamber 61a.

In the suction chamber 61b, a truncated umbrella-shaped suction cylinder 94 is fixed so as to surround the bearing base 70. Suction tube 94
A suction tube 84 connected to a blower communicates with the inner cavity of the blower. The suction port 93 at the head of the suction tube 94 is narrowed so that the suction tube 84 can be uniformly sucked and ventilated from the entire surface of the drying disk 66 even though the suction tube 84 is at a position where the inner cavity of the suction tube 94 is biased. It is formed in a squeezed state.

The hot air duct 92 is attached to the upper wall of the upper part of the machine frame 15 and has a heater 90 therein.
And the air supply port 96 is directed toward the drying unit 61.
Due to the suction of the suction pipe 84, the atmosphere naturally flows in from the air inlet 95, and becomes warm air to uniformly flow on the drying disk 66 of the drying unit 61.

Next, the operation of this embodiment will be described. When the screw feeder 32 is driven to supply the milled rice in the hopper 30 to the milled rice unit 10 while the rotating shaft 23 of the milled rice unit 10 is rotated at a predetermined rotation speed (for example, 700 rpm), the milled rice is fried. Spraying room 25 by spiral 26
It is conveyed from the bottom to the top and supplied to the polishing rice room 21. The milled rice is conveyed upward from the bottom by the helix 26 and the pressure valve 18c is opened at a pressure equal to or higher than a predetermined value, so that the milled rice is pressurized in the polishing room 21.

An appropriate amount of sharpening water is supplied from the water inlet 28a to the rice polishing room 2
When poured into the polishing pad 1, the rice is stirred by the polishing rice roll 20 together with the pressurized rice in the polishing rice chamber 21 to perform polishing rice processing. As a result, objects to be removed such as ariuron residues are released from the surface of the polished rice and dissolved in the sharpening water. The sharpening water is poured from the water inlet 28a of the head and flows down naturally from top to bottom, and the polished rice is conveyed from bottom to top in the opposite direction to the sharpening water and polished. The polished rice that has been polished is a spiral spiral 26
The pressure valve 18c is opened by the conveyance force of the head, and is discharged from the discharge port 18b of the head by centrifugal force and natural fall.
The water is supplied to the lower part of the dewatering chamber 55 through a transfer port 56c provided in the dewatering inner cylinder 56 of FIG. In addition, the sharpened water that has been subjected to the rice polishing treatment and is contaminated is discharged from the discharge pipe 39 through the discharge port 18a of the leg portion of the rice polishing cylinder 18.

In the dehydrating section 38, the centrifugal dehydrating cylinder 43 is rotating at a predetermined speed. That is, the dehydrating inner cylinder 56 rotates at a predetermined speed (for example, 1200 rpm), and the dehydrating outer cylinder 44 rotates at a predetermined speed (for example, 1000 rpm) slightly lower than the dehydrating inner cylinder 56. Simultaneously, the rotation of the dewatering inner cylinder 56 causes natural suction from the upper end opening of the dewatering inner cylinder 56, and this air is supplied to the blowing chamber 45, the blowing hole 56 a, the dehydrating chamber 55, and the dewatering outer cylinder 44 of the dewatering inner cylinder 56. Through the discharge hole 44 a, it reaches the inside of the cylindrical shaft 66 b of the drying disk 66 and the inside of the outer cylinder 36, and is discharged from the discharge pipe 60.

The milled rice supplied to the dewatering chamber 55 of the dewatering section 38 is centrifugally dewatered while being raised by the screw blades 54, and the sharpening water is discharged from the discharge hole 44 a of the dewatering outer cylinder 44. At this time, all of the sharpening water is centrifugally dehydrated while rising in the dehydration chamber 55 together with the milled rice. In addition, the sharpening water adhering to the polished rice during centrifugal dehydration is the sharpening water adhered at the last stage of the polishing rice treatment, and thus remains pure. 44 discharge holes 44a
From the discharge pipe 60 through the inside of the cylindrical shaft 66b of the drying disk 66 and the inside of the outer casing 36. The air sucked from the upper end opening of the dewatering inner cylinder 56 assists the centrifugal dewatering action by being injected into the dewatering chamber 55. The dewatered polished rice has a discharge port 44 of a dewatering outer cylinder 44 by centrifugal force and natural fall with very little water adhered to the surface.
b and is supplied to the drying disk 66 of the drying section 61.

The polished rice supplied to the drying chamber 61a of the drying section 61 is moved from the center side to the outer side by the guide plate 72 on the drying disk 66 rotating at a predetermined speed (for example, 7 rpm). Migrated and spread. The diffused white rice is supplied from the hot air duct 92 to the drying chamber 61 a and the drying disk 66.
The air (hot air) that flows to the suction pipe 84 through the ventilation hole 66a, the suction chamber 61b, and the suction tube 94 is completely removed, and the water adhering to the surface is completely removed. The unpolished rice which has not been washed is eventually discharged from the discharge gutter 74.

In the above steps, the passage time of each part of the polished rice is about 5 seconds in the polishing rice section 10, about 25 seconds in the dewatering section 38,
It takes about 30 seconds in the drying unit 61, and the time required for the entire process is about 1
Minutes. As described above, since the time during which the polished rice is in contact with water is very short, high-quality unwashed rice can be produced.

[0045]

As described above, according to the present invention, the polishing rice part, the dewatering part and the drying part are vertically arranged and their rotation centers (the rotation centers of the polishing rice roll, the centrifugal dewatering cylinder and the drying disk) are arranged. Are arranged on the same vertical center line, so that the connecting means between each part and the means for transporting the polished rice can be simplified, and the whole apparatus can be made small and inexpensive. In addition, since the milled rice can be transported by centrifugal force and natural fall, water for transporting the milled rice is not required, so that not only the water bill is reduced, but also the discharge of polluted water (sharpening juice) is reduced. Installation of a simple water purification device is sufficient, and a water-saving type inexpensive device can be provided.

Further, according to the rice polishing section of the present invention, dirty water is used in the first stage of the rice polishing process, and pure water is gradually used as the rice polishing process progresses. Since pure water is used in the final finishing stage, there is no need to pour fresh rinse water, and a small amount of water can be used for pretreatment for producing a taste-free unwashed rice.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of an embodiment of the present invention.

FIG. 2 is a plan view of a drying unit.

[Explanation of symbols]

 10 polishing rice section 20 polishing rice roll 38 dewatering section 43 centrifugal dewatering cylinder 61 drying section 66 drying disk

Claims (1)

[Claims] (1) a frying spiral for conveying polished rice from bottom to top;
A pouring water inlet provided at the head, a polished rice discharge port provided at the head, and a polish water poured from the pouring pad with the polished rice pressurized by the conveyance of the fried helical spiral. A polishing rice roll for stirring and polishing the rice, and a polishing rice section for discharging the polishing rice after the polishing from the discharge port; and a polishing pad for conveying the polishing rice supplied from the polishing rice section from below to above. A dewatering unit having a centrifugal dewatering cylinder for dewatering while drying, and a drying unit having a drying disk for drying the polished rice supplied from the dewatering unit, comprising: a polishing rice roll, a centrifugal dewatering cylinder and a drying disk. An apparatus for producing rice without washing, wherein the rotation centers are arranged on the same vertical center line.