JP2003181308A - Rice milling machine and rice milling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rice milling machine capable of carrying out a rice polishing while effectively inhibiting a temperature raising of rice and enhancing a conveying performance of a rice bran to a rice bran reservoir. <P>SOLUTION: The rice milling machine 1 conveys a rice bran separated from the rice to the rice bran reservoir 61 at the outside of a container 21 by a fan 71 rotated with a stirring tool 41 in a separation cage 31. An upper side than a layer of the rice thrown into the separation cage 31 is made to communicate with the rice bran reservoir 61 and an air return port (return air passage) 65 for returning the air fed with the rice bran to the rice bran reservoir 61 by an air-feeding force of the fan 72 to the upper part of the layer of the rice is provided. Thereby, a temperature raising of the rice is inhibited by the fact that the air returned through the returning air passage 65 is passed through the layer of the rice. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a bran of grains such as rice, wheat, buckwheat (embryo, bran layer and starch layer exfoliated from the grain, or fine powder mixed with seed coat etc.). ) Is removed, and the present invention relates to a rice polishing machine and a method for polishing rice.

[0002]

2. Description of the Related Art A bottomed cylindrical container having a large number of separation holes into which rice is charged is housed in a bottomed cylindrical container, and a stirring device arranged in the car is driven by a motor. In the rice milling machine for rice polishing by rotating with the power of, the container lid that closes the upper end opening of the container is provided with many vent holes, and the rice bran generated by rice polishing is carried out to the bran receiver outside the container by the wind force of the fan. Things are offered.

In this rice milling machine, it is expected that the temperature rise of the rice milled in the separation basket will be suppressed due to the blowing of the fan.

By the way, the wind formed by the fan is blown inward through the separation holes of the separation car while rotating around the outside of the separation car. However, since the separation holes are so small that the polished rice grains cannot pass through, it is difficult for the wind to smoothly flow into the separation basket. In addition, the vent holes on the container lid are provided to discharge the hot air of rice that accompanies rice polishing, but in order to prevent the bran from leaking outside through these vent holes, the vent holes are separated holes. It is formed with small holes that are equivalent to or smaller than. Therefore, it is also difficult for the outside air to be smoothly sucked into the separation cage through the ventilation hole.

Under these circumstances, the fan that rotates together with the stirring tool at the time of rice polishing is used only to carry the rice bran to the rice bran reservoir, and the temperature of the rice being milled is increased by the wind force sent by the fan. Cannot be effectively suppressed.
Therefore, in the conventional rice milling machine, even though the container lid has a vent hole, the temperature of the rice easily rises when the rice polishing time is long and the rice is cooked because of the acceleration of the drying of the rice. The taste of cooked rice may deteriorate. or,
As described above, since the outside air cannot be effectively introduced from the ventilation hole, the performance of conveying the bran to the bran reservoir by the rotation of the fan is not sufficient. This can be improved by increasing the rotation of the fan, but doing so is not preferable because the rice may be agitated too much for proper rice polishing.

[0006]

DISCLOSURE OF THE INVENTION Problems to be solved by the present invention include a rice polishing machine and a rice polishing method capable of polishing rice while effectively suppressing an increase in temperature of rice and improving the performance of transporting rice bran to a rice bran reservoir. Is to get.

[0007]

The rice milling machine of the present invention is provided with a fan that is rotated together with a stirring tool in a separation basket.
In the rice milling machine that carries the bran separated from rice to the bran reservoir outside the container, a return air passage that connects the bran reservoir to the upper side of the rice layer loaded in the separating basket is provided, and the bran is blown by the fan. The air sent with the bran into the reservoir is returned to the upper side of the rice layer through the return air passage, and the air thus returned circulates through the rice layer.

In the rice milling machine of the present invention, the rice that is thrown into the separating basket to be polished is positively exposed to the flow of air that is returned to the separating basket via the bran reservoir and passes through the rice layer to circulate. Moreover, the wind does not become a dead end in the bran reservoir, and the wind can be circulated as described above.

In the rice polishing method of the present invention, the bran separated from the rice is carried out to a bran reservoir provided outside the container by a fan that is rotated together with a stirring tool in a separation basket housed in the container, The air in the reservoir is returned to above the layer of rice put in the separation basket, and the returned air is passed through the layer of rice to polish the rice.

In the rice polishing method of the present invention, the air flow generated by the fan can be supplied to the rice layer in the separation basket from above and circulated without stopping in the bran reservoir.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A rice milling machine according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 5. The rice-polishing machine 1 is formed by including a rice-polishing machine main body 2 and a rice-polishing attachment 20 that is attached to and detached from the rice-polishing machine body 2.

As shown in FIG. 1, the rice-polishing machine main body 2 has a vessel-shaped container mounting portion 3. A drive mechanism 5 is built in a rice-polishing machine main body case 4 made of a synthetic resin, which is an outer shell of the rice-polishing machine main body 2. The drive mechanism 5 includes a drive motor 6, a drive shaft 8 projecting from the central portion of the container placement portion 3 and vertically supported by a bearing 7, and decelerating the rotational power of the drive motor 6 on the drive shaft 8. And a transmission mechanism 9 for transmission. Transmission mechanism 9
For example, a winding transmission mechanism is used. Drive shaft 8
A drive side coupling 10 is attached to the upper end of the. An operation section is provided on the surface of the portion of the rice milling machine body case 4 which covers the drive motor 6, and various operation switches (only one switch is shown in FIG. 1) 11 are attached thereto.

As shown in FIG. 1, a rice polishing attachment 20
Is provided with a container 21, a separating basket 31, a stirring tool 41, a container lid 51, a bran reservoir 61, a fan 71, a bran discharge ring 81, and a return air passage.

The container 21 has a bottomed cylindrical shape with an open upper surface, and a short cylindrical container base 22 with an open lower end is provided on the lower surface of the container 21 in a protruding manner. The container table 22 is attached to the container mounting portion 3
The container 21 is mounted on the container mounting portion 3 by being detachably fitted into the concave portion 3 a. The container 21 has a handle 23 on its outer peripheral surface, and the handles 23 to 18
It has a spout 24 projecting outward in the radial direction at the opening edge separated by 0 °.

As shown in FIG. 2, a bearing holder 25 is attached to the center of the bottom wall 21b of the container 21 so as to pass through the bottom wall 21b, and the container base 22 is connected to the lower end of the holder 25. A bearing 26 built in the bearing holder 25 vertically supports a rotating shaft 27 that vertically penetrates through a central portion of the bearing 26. A driven side coupling 28 that is detachably meshed with the coupling 10 when the container 21 is attached to or detached from the container mounting portion 3 is attached to a lower end portion of a rotating shaft 27 arranged in the center of the container 21. Has been.

The separating basket 31 can be put in and taken out of the container 21. As shown in FIG. 1, the separation cage 31 includes a cage body 32 made of metal and an upper surface of which is opened, and a central cylindrical body 3 made of synthetic resin.
3 and 3. The central cylindrical body 33 penetrates the central portion of the car bottom wall 32b of the separation car 31 and is riveted to the car bottom wall 32b. Both the upper and lower ends of the central cylindrical body 33 are open. The car body 32 is provided with a car bottom wall 32b integrally at the lower end of a cylindrical car peripheral wall 32a, and an annular shape that is continuous in the circumferential direction at the upper end opening edge of the car peripheral wall 32a and projects horizontally toward the outside. Overhang flange 32
It is formed by providing c.

Overhanging flange 32c of the car body 32
The main part of the car, except for the
It has a bottomed cylindrical shape shorter than the depth of. The overhanging flange 32c is formed in such a size that it can be hooked from above on the upper surface of the bran ring 81 to be described later.

A large number of separation holes (not shown) are formed in the car peripheral wall 32a of the separation car 31 over substantially the entire area thereof, and a large number of separation holes (not shown) are also formed in the car bottom wall 32b of the separation car 31 over the substantially entire area thereof. (Not shown) is opened. The separation hole may be provided at least in the car bottom wall 32b. Each of these separation holes is a small hole of a size that prevents passage of the rice that has been housed in the separation basket 31 and milled.

As shown in FIG. 1, the upper part 2 of the rotary shaft 27
The stirring tool 41 is attached to the 7a so as to be detachably fitted from above in the separation basket 31. The stirring tool 41 is rotated in the direction of arrow F in FIG. The stirring tool 41 includes a stirring tool body 42 made of synthetic resin, a synthetic resin or light metal shaft engagement member 43 built in the body 42, and one or more, for example, a pair of stirring portions 44. The stirring section 44
Can be omitted, and in this case, the stirring tool body 42
Is tapered, and the outer peripheral surface thereof is roughened, and the friction between this surface and the rice put in the separation basket 31 allows the rice to be moved and stirred.

A central cylindrical portion 42a is integrally projectingly provided on the inner surface of the central portion of the upper end wall which is closed at the upper end of the stirring tool body 42, and the shaft engaging member 43 is connected to the lower end portion thereof. The shaft engaging member 43 is fitted into the upper portion 27a of the rotary shaft 27 so as to be insertable and removable from the axial direction, and has an engaging portion (not shown) that is hooked in the circumferential direction of the upper portion 27a in this fitted state. ing.
Therefore, the stirring tool 41 is arranged in the central portion of the separation car 31 and is rotated together with the rotating shaft 27.

As shown in FIG. 3, the agitating portion 44 is made of a metal, for example, stainless steel blade, and the connecting plate portion 4 integrally formed by projecting from the outer periphery of the lower end portion of the agitating tool body 42.
It is attached to the No. 5 by a fixed part 46 such as a rivet. The agitating portion 44 is configured such that the agitator main body 42 can be seen when viewed from above with the agitator 41 arranged in the separation basket 31.
It is formed in an arc shape that gradually approaches the car peripheral wall 32a from the outer periphery of.

As shown in FIGS. 1 and 2, the rotary shaft 27
A fan mounting portion 38 is provided on the lower peripheral surface of the upper portion 27a. The fan mounting portion 38 is located between the car bottom wall 32b of the separation car 31 and the bottom wall 21b of the container 21. A fan 71 is detachably fitted and attached to the fan attachment portion 38 from above. Therefore, the fan 71 is arranged in the bottom gap BG formed between the bottom walls 32b and 21b. The fan 71 is pulled up from the attached state to thereby cause the upper portion 27a of the rotary shaft 27 to rise.
Can be removed from.

A fan 71 rotated together with the rotary shaft 27
Is an integrally molded product of synthetic resin and has a plurality of blades 72 that are radially provided. The suction side of the fan 71 is on the upper side and faces the car bottom wall 32b, and the discharge side of the fan 71 is on the outer periphery and faces the inner peripheral surface of the lower end portion of the car peripheral wall 32b.

As shown in FIGS. 1 and 2, a brazing ring 81 made of synthetic resin, to which a rubber seal 82 is attached, is removably installed at the opening edge of the upper end of the container 21. As shown in FIGS. 3 and 4, etc., the bran discharge ring 81 includes a ring portion 83 and a bran outlet 84 that is integrally projected from the ring portion 83 to the outside in the radial direction. The seal 82 has a hole 82a (see FIG. 3) through which the bran outlet 84 passes, and is attached to the ring portion 83. The ring portion 83 has an installation step portion 83a that is continuous in the outer circumferential surface without interruption in the circumferential direction, and has a pair of inward flanges 83b that are interrupted by two notches 83d on the inner circumferential surface.

The annular portion of the ring portion 83 below the installation step portion 83a is fitted inside the upper opening edge 21c of the container 21, and the outer diameter of the annular portion above the installation step portion 83a is the container 2
The outer diameter of the upper end opening edge 21c of No. 1 is substantially equal to the outer diameter. The ring portion 83 is a convex portion 83 that is overlaid on the spout 24.
c It has one. A rib 85 for closing the spout root is integrally formed downward at the base of the inward flange 83b so as to correspond to the convex portion 85a.

The bran outlet 84 has both end walls 84a and 84b substantially parallel to the direction in which the radial line R (see FIG. 3) of the ring portion 83 passing through the center of the outlet 84 in the width direction is extended. It has a laterally elongated shape extending in the circumferential direction and is integrally projected outward. Therefore, the bran outlet 84 has a horizontally long rectangular tube shape as shown in FIG. 4 (B). Nuka Exit 84
Has a length that protrudes outward in the radial direction of the container 21 when the bran discharge ring 81 is installed on the container 21, as shown in FIGS. 1 and 3.

At the lower end of the inward flange 83b, as shown in FIGS. 2 and 4 (B), an air guide rib 86 that integrally projects downward is extended. The air guide rib 86 is a rib base 86 that curves along the inner peripheral edge of the inward flange 83b.
a and an air guide portion 86b that is obliquely bent from the base 86a. As shown in FIG. 3, the air guide portion 86b is provided corresponding to the side wall 84b of the bran outlet 84. The side wall 84b is the container peripheral wall 21a of the container 21 and the car peripheral wall 32a.
With reference to an airflow that swirls while rising in an annular circumferential gap SG formed between the swirl and the airflow (the direction of this swirling airflow is indicated by an arrow E in FIG. 3), the direction of rotation is greater than that of the side wall 84a. It is located on the downstream side.

The air guide rib 86 has a peripheral air gap SG so that the air guide portion 86b partitions the upper portion of the peripheral air gap SG in a substantially radial direction.
The upper portion of the air guide portion 86b faces the side wall 84b of the bran outlet 84. Therefore, the separation basket 31
A swirling air flow around the can be directed to the bran outlet 84.

In the bran-extracting ring 81 having the above-described structure, the inward flange 83b is fitted along the inner peripheral surface of the upper end opening edge 21c of the container 21, and the installation step portion 83a is arranged on the upper end surface of the container 21. It is placed and set on the container 21 in a removable manner. In the bran ring 81 that has been set,
The separation basket 31 is passed through, and the protruding flange 32c of the basket 31 is hooked on the upper surface of the bran-extracting ring 81. As a result, the separation car 31 housed in the container 21 is suspended by the bran-out ring 81, and in this housed state, the inner peripheral edge of the inward flange 83b and the outer peripheral surface of the car peripheral wall 32a of the separation car 31 are not shown. As shown in 1, they are close to each other.

When the separated car 31 is accommodated in the container 21, as shown in FIG. 1, a bottom gap BG for accommodating the fan 71 is formed between the bottom wall 21b of the container 21 and the car bottom wall 32b of the separated car 31. Thus, an annular peripheral space SG is formed between the peripheral wall 21a of the container 21 and the car peripheral wall 32b of the separation car 31. The lower end of the peripheral void SG is continuous with the peripheral portion of the bottom void BG. The peripheral void SG is substantially closed from the upper side by a bran-extracting ring 81 and communicates with the bran outlet 84 of the ring 81.

The container lid 51 is made of transparent synthetic resin in a substantially circular shape, and is detachably attached to the container 21 with a bran-extracting ring 81 sandwiched between the container lid 51 and the container 21, as shown in FIGS. . As shown in FIG. 2, a spout hook 52 and a handle engaging body 53 are provided on the outer peripheral portion of the container lid 51 at 180 ° apart from each other. The container lid 51 has a slanted posture in which the spout hook portion 52 is lowered frontward, and the hook portion 5
2 is hooked on the flat lower surface of the spout 24 of the container 21, and then pushed down and rotated so that the side of the handle engaging body 53 is lowered with the spout 24 as a fulcrum, so that the handle 23 is below the handle engaging body 53. The upper part is elastically clamped and the container 21
Mounted on. By attaching the container lid 51 to the container 21, the overhanging flange 32c is sandwiched between the upper surface of the bran-extracting ring 81 and the inner surface of the peripheral portion of the container lid 51. Container lid 51
A large number of vent holes 54 are formed in the container 21 to release the heat of rice generated by rice polishing to the outside of the container 21. These ventilation holes 54 are small holes that prevent the bran from leaking to the outside.

A bran reservoir 61 is detachably attached to the outside of the container 21. The bran reservoir 61 is formed by a bran reservoir container 62 made of, for example, synthetic resin and having an open upper end, and a bran reservoir lid 63 that is openably and closably attached to the upper end opening of the container 62. As shown in FIG. 5 etc., the bran container 62
Has a bran inlet 64 that is detachably fitted to the outer periphery of the bran outlet 84 on the inner wall of the upper end thereof.

The bran collecting lid 63 is overlapped on the upper surface of the bran outlet 84 with a part of the overhanging flange 32c sandwiched between them and a wind return port 65.
have. The wind return port 65 has a horizontally long rectangular tube shape, and is shown in FIGS. 1 and 2 when the bran reservoir lid 63 is put on the bran reservoir 62 fitted and supported in the bran outlet 84. Is arranged on the bran outlet 84.

The wind return port 65 is provided to return the air in the bran reservoir 61 to above the rice layer charged into the separation basket 31, and the protruding length thereof is longer than that of the bran inlet 64. Specifically, as shown in FIG. 1, the length of the wind return port 65 is set so as to cross a part of the overhanging flange 32c of the separation car 31 and project in the central axis direction of the separation car 31. . The bran reservoir lid 63 that creates a flow of air to the wind return port 65 shown by an arrow D in FIG. 1 forms a return air duct that guides the upper air in the bran reservoir 61 to above the rice layer in the separation basket 31. ing.

An upward stopper protrusion 66 is provided on the upper surface of the wind return port 65. In addition, reference numeral 67 in FIG. 1 denotes a baffle projecting downward on the inner surface of the bran reservoir lid 63, and is provided for separating the bran contained in the returned airflow to some extent.

As shown in FIGS. 2 and 5, on a part of the peripheral wall of the container lid 51, the wind return port 65 and the bran outlet 84 and the bran inlet 64 which are located underneath and are fitted to each other interfere with each other. A concave escape 55 that avoids the above is formed, and a pair of guide pieces 56 that are located above the escape 55 are formed. The pair of guide pieces 56 are obliquely provided so as to be arranged in a V shape, and the wind return port 65 is inserted between them. Further, the container lid 5 is located between the pair of guide pieces 56.
A stopper hole 57 into which the stopper protrusion 66 is fitted is formed in the peripheral portion of 1.

Next, the case of polishing brown rice will be described. First, the rice polishing attachment 20 is assembled in a state where the rice attachment 20 is placed on the rice polishing machine main body 2 or removed from the rice polishing machine main body 2.

In this assembly, first, the fan 71 is housed in the container 21 and attached to the rotary shaft 27, and then the bran-discharging ring 81 is placed on the container 21 in a predetermined direction. next,
The separating basket 31 is housed in the container 21 until the overhanging flange 32c of the separating basket 31 is caught on the upper surface of the bran protrusion ring 81 from above. Along with this, the upper portion 27a of the rotating shaft 27 is inserted into the central cylindrical body 33 of the separation basket 31. After that, the stirring tool 41 is housed in the separation car 31, and the shaft engaging member 43 is fitted and connected to the upper portion 27a of the rotating shaft 27 in the central cylindrical body 33.

Next, the bran inlet 64 of the bran reservoir 62 is fitted into the bran outlet 84 of the bran ejecting ring 81 to make the bran reservoir 6
After supporting No. 2 on the container 21 side, a bran reservoir lid 63 is fitted and covered on the bran reservoir 62 to assemble the bran reservoir 61.
In this state, a desired amount of brown rice is put into the separation basket 31, and then the container lid 51 is attached by the procedure described above so as to close the upper end opening of the container 21. Thereby, the bran-exiting ring 81
And the overhanging flange 32 of the separating basket 31 that overlaps with this
c is sandwiched between the upper end opening edge 21c of the container 21 and the peripheral portion of the container lid 51, and the wind return port 65 is sandwiched between the overhanging flange 32c and the container lid 51. Separation basket 31 and wind return port 65
Is held so that it does not move either vertically or circumferentially.
Moreover, by this assembly, the stopper projection 66 is fitted into the stopper hole 57, and the bran reservoir 61 is held so as not to accidentally come off from the bran outlet 84.

Thereafter, the rice polishing attachment 20 assembled by the above procedure is attached to the rice polishing machine body 2. In this attached state, the driving side coupling 10 and the driven side coupling 28 are meshed with each other, and are connected so that power can be transmitted from the rice milling machine body 2 side to the stirring tool 41. After the above setting is completed, the operation switch 11 is operated according to the amount of brown rice put into the separation basket 31 to start the rice polishing operation. As a result, rice milling is carried out with the following dry-type separation of bran.

That is, the drive mechanism 5 in the rice milling machine main body 2 is operated, and the rotation of the drive shaft 8 causes the couplings 10 and 2 to rotate.
It is transmitted to the rotating shaft 27 via 8 and the stirring tool 41 is rotated together with this shaft 27 in the separation cage 31. Therefore, the pair of crawling portions 44 of the crawling tool 41 pushes the rice in the separation basket 31 toward the basket peripheral wall 32a while stirring the rice, while receiving the rotational force.

Thus, the rice in the separation basket 31 is pressed against the inner peripheral surface of the cage peripheral wall 32a of the separation basket 31 in a stationary state, and is moved along the inner peripheral surface of the cage peripheral wall 32a.
After moving toward the upper side of the inner peripheral surface of the separation basket 31, the separation basket 3 is moved toward the radial center of the separation basket 31 by its own weight.
It is moved in the direction of the car bottom wall 32b of No. 1 and is stirred while convection is performed in the vertical direction.

By the rubbing of the rice with each other and the rubbing of the rice with the separation basket 31 and the stirring tool 41, the bran is removed from the brown rice, and the bran is removed from the separation basket 31. Is left. The generated bran is
It passes through each separation hole of the car peripheral wall 32a and the car bottom wall 32b and is discharged to the peripheral space SG and the bottom space BG.

During the above-mentioned rice polishing, the fan 71 is rotated together with the rotating shaft 27 in the bottom gap BG, and the fan 71 blows air by its respective blades 72. In this blowing, the upper side of the fan 71 is the suction side, and the outer peripheral side of the fan 71 is the exhaust side.

Therefore, the air contained in the rice layer (not shown) in the separation basket 31 is sucked into the bottom space BG through the separation hole of the basket bottom wall 32b, and this air is supplied to the fan 71.
Via the bottom clearance BG while swirling through the peripheral clearance SG. This air flow is indicated by arrow E in FIGS.
Due to the momentum of the swirling airflow E, a part of the air contained in the rice layer in the separation car 31 is drawn out to the side gap SG through the separation hole of the car peripheral wall 32a.

Then, the swirling airflow E is passed through the interposition ring 81.
The flow direction is changed by the baffle portion 86b of the bran outlet 84
It is introduced into the inside and passes through this bran outlet 84 to the bran container 62.
Flows in. The flow of the inflowing air is shown by an arrow H in FIGS. The inflowing air into the bran reservoir 62 collides with the upper wall surface 62a (see FIG. 1) of the bran reservoir 62 facing the outflow direction and changes its flow direction toward the bran lid 63. After being blown, it flows in the direction of arrow D inside the bran reservoir lid 63 while bypassing the baffle 67, and passes through the wind return port 65.

As a result, the air above the bran reservoir 61 is returned to the inner space of the container lid 51. Since this inner space faces the upper opening of the separation basket 31 from above, air is eventually returned above the rice layer charged in the separation basket 31. As described above, this air is sucked into the rice layer from above because the air in the rice layer is sucked downward by the fan 71.

That is, the wind generated by the rotation of the fan 71 as described above swirls from the bottom gap BG to the side gap and flows into the bran reservoir 61 through the bran outlet 84. The circulation of returning to the upper side of the rice layer in the separation basket 31 through the return port 65 and supplying the rice layer is repeated.

By the generation of this forced circulation air flow, the bran discharged from the separation holes of the car bottom wall 32b and the car peripheral wall 32a is discharged to the gaps BG and SG, as described above. Can be carried by circulating air flow. As a result, the bran transferred to the bran reservoir 61 has the upper wall surface 62a.
As the circulating air flow hits and changes its direction, it is separated from this air flow and falls due to its own weight and is stored in the lower part of the bran reservoir 62. The fall path of the bran at this time is shown by a dotted arrow in FIG. By the automatic carry-out of the rice bran as described above, the rice bran separated from the brown rice is not accumulated in the bottom void BG, and the rice bran 61 is kept in a low temperature condition outside the container 21.
It can be discharged and stored in.

As described above, the wind generated by the fan 71 continues to circulate along the separating basket 31 or the bran reservoir 61.
There is no dead end in the rice bran 6
Because it is circulated through the rice layer of 1 and 31 in the separation basket,
It is possible to improve the transfer performance of the bran from the container 21 to the bran reservoir 61.

As described above, since the wind generated by the fan 71 circulates through the rice layer in the separation basket 31 and circulates, the rice can be positively exposed to this wind. Therefore, it is possible to effectively suppress an increase in the temperature of rice even though frictional heat is generated due to rice polishing. In this case, the heat of the circulating air flow heated by heat exchange with rice is absorbed by the member with which it comes into contact, and the heat of the member is naturally released into the atmosphere, so that it is supplied to the rice layer from above. The temperature of the circulating air flow is always lower than the temperature of rice, so that the temperature rise of rice can be effectively suppressed as described above. Moreover, since the outside air is drawn into and mixed with a part of the vent hole 54 of the container lid 51 in accordance with the above air circulation, the temperature of the circulating air flow can be lowered. In the present invention, the container lid 5
The one vent hole 54 can be omitted.

Further, in returning the circulating air onto the rice layer in the separation basket 31, in the present embodiment, the air is introduced into the space formed between the container lid 51 and the separation basket 31 above the upper end of the separation basket 31. Is returning. That is, the separation basket 31
Since the wind return port 65 is arranged above, the separation cage 3
Since the wind return port 65 is connected to the upper part of 1, there is no need to process dents or holes. Therefore, the structure of the separation basket 31 need not be complicated, and the rice does not leak from the upper side of the separation basket 31 even if the rice is slightly shaken when the separation basket 31 containing rice is moved. it can.

The bran return air passage having the wind return port 65 is formed in the bran reservoir lid 63 and guides the air in the upper portion of the bran reservoir 61 separated from the bran in the bran reservoir 61.
The amount of bran contained in the air stream returned to the rice layer can be minimized. Furthermore, since the bran return air passage is formed by the bran collecting lid 63, it is possible to reduce the number of parts and the cost without requiring a dedicated component for forming the bran return air passage.

Moreover, as described above, in order to return the circulating air to the upper side of the rice layer, the wind return port 65 is arranged above the bran outlet 84 for guiding the bran to the bran reservoir 61. The sizes do not constrain each other. Therefore, the shapes of the both openings 84, 65 can be secured in a limited space, and the both openings 84, 65 can be formed into a horizontally long rectangular tube shape that is simple in shape. Therefore, not only the forced circulation of the air flow becomes easier, but also the adhesion of the bran to the bran outlet 84 and the wind return port 65 is suppressed, so that the cleaning property after use is improved and the usability is improved.

The present invention is not limited to the above embodiment. For example, according to the present invention, it is possible to carry out the same treatment as grain polishing on grains other than rice. Further, in the present invention, the container may not be separate from the main body of the rice polishing machine, but may be integrally provided so as not to be removed from the main body of the rice polishing machine.

Further, the present invention is not limited to the structure using the bran-extracting ring as in the above-mentioned one embodiment. That is,
A bran outlet is formed on the upper part of the container, and an overhanging flange is placed on the opening edge of the upper end of the container so that the separating basket is directly supported on the container, and the wind return port of the bran reservoir connected to the bran outlet is placed on the overhanging flange. At the same time, it can be applied to a rice polishing machine having a structure in which an overhanging flange is sandwiched between an upper opening edge of a container and a peripheral portion of a container lid to fix a separation basket and a bran reservoir.

The present invention can also be applied to a rice polishing machine having a bran reservoir below the lower part of the container. In this case, a pipe member (return air passage) having a wind return port at one end is used, and the other end is connected so as to communicate with the bran reservoir, so that the air separated from the bran in the bran reservoir is removed. The wind return port may be used in the same manner as in the first embodiment or by connecting to the bran inlet provided in the lid so as to return to the layer of rice in the separation basket.

[0058]

According to the inventions according to claims 1 to 4 and the invention according to claim 5, the rice can be milled while effectively suppressing the temperature rise of the rice, and the performance of conveying the bran to the bran reservoir can be improved. A rice polishing machine and a rice polishing method can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view of a rice polishing machine according to a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing a rice polishing attachment provided in the rice polishing machine of FIG.

FIG. 3 is a cross-sectional view showing a rice polishing attachment provided in the rice polishing machine of FIG. 1 with its container lid omitted.

FIG. 4A is a plan view showing a bran-extracting ring included in the rice polishing attachment of FIG. (B) is a bran-extracting ring shown in FIG.
(A) The figure seen and shown from the middle arrow Z direction.

FIG. 5 is an exploded perspective view showing the mutual relationship among the bran outlet, the bran reservoir, and the container lid of the rice polishing machine of FIG. 1.

[Explanation of symbols]

1 ... Rice milling machine body 2 ... Rice milling machine body 5 ... Drive mechanism 6 ... Drive motor 8 ... Drive shaft 21 ... Container 21b ... bottom wall of container 27 ... Rotary axis 31 ... Separation basket 32b ... basket bottom wall BG: bottom void SG ... Peripheral void 41 ... Stirrer 51 ... Container lid 61 ... Nukadame 63 ... Nukadame lid (return air duct) 65 ... Wind return port of the return air passage 71 ... fan 81 ... Nukadashi Ring 84 ... Nuka Exit

Claims (5)

[Claims] 1. A rice milling machine main body having a drive shaft and a drive motor for rotating the drive shaft, and a rice milling machine main body provided on the rice milling machine main body and rotatably supported on the bottom wall by penetrating the bottom wall. A container having a rotating shaft to be connected and a bottomed cylindrical separating basket that is housed in this container and has a large number of separation holes for separating bran from rice, and the rotating shaft is attached to the rotating shaft in this separating basket. A stirring tool that is attached and rotated, a removable container lid that closes the upper end opening of the container, and a bran reservoir provided outside the container in communication with the space between the container and the separation basket, A fan that is located between the bottom wall of the container and the bottom wall of the separation basket and is attached to the rotary shaft to carry out the bran to the bran reservoir; and a layer above the rice layer charged in the separation basket. It is provided in communication with the inside of the rice bran reservoir and guides the air from the rice bran reservoir onto the rice layer. A rice polishing machine equipped with a return air passage. 2. The rice mill according to claim 1, wherein the air return port of the return air passage is arranged above the upper end of the separation basket. 3. The rice mill according to claim 1 or 2, wherein the return air passage is provided above the bran reservoir. 4. The rice polishing machine according to claim 1, further comprising a horizontally long bran outlet communicating with the void, the bran outlet being fitted to a bran inlet of the bran reservoir, and the return air passage being horizontally long. It has a shaped wind return port, and this wind return port is arranged on the bran outlet. 5. A bran separated from rice by rotating a stirring tool in a separating basket housed in the container is discharged into the container through a large number of separation holes of the separating basket, and the bran is separated from the rice. It is carried out by a fan that is rotated together with a stirring tool to the bran reservoir provided outside the container, and the air in the bran reservoir is returned to above the layer of rice that has been thrown into the separation basket by the wind force sent by the fan. A method of polishing rice, which comprises polishing the rice while passing it through the layer of rice.