JPH0663427A - Dry-rice cleaning apparatus - Google Patents

Abstract

PURPOSE:To enhance rice cleaning accuracy in a sanitary state without generating the breakage of grains of cooked rice by providing the outer cylinder rotatable in an outer case, the drive source thereof, a fixed inner cylinder forming a rice cleaning chamber, a spiral guiding rice to a sending-out port and the inclined ring provided to the lower part of a receiving chamber. CONSTITUTION:A dry rice cleaning apparatus is equipped with an outer case 20 receiving rice, the outer cylinder 60 provided in the outer case 20 in a rotatable manner, the drive source of the outer cylinder 60 and a fixed inner cylinder 70 having rice cleaning and embryo cutting slits 71 and forming an annular rice cleaning chamber R2 between the outer and inner cylinders 60, 70 and constituting a duck for recovering a generated rice bran component. A spiral 76 guiding the rice introduced into the rice cleaning chamber R2 from the receiving chamber R1 formed between the outer case 20 and the outer cylinder 60 to a sending-out port 57 is provided to the area corresponding to a taking-in port 63 of the outer peripheral surface of the inner cylinder 70 and an inclined ring 41 having an inclined surface 42 set to an angle of inclination sufficient to allow the rice in the receiving chamber R1 to slide down toward the taking-out port 63 under its own wt. is arranged to the lower part of the receiving chamber R1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry type rice polishing apparatus for polishing rice in a dry state without using water.

[0002]

2. Description of the Related Art Generally, a small amount of bran layer (aleurone layer) is left on the surface of rice grain produced by whitening brown rice with a rice polishing machine, which consists of aleurone powder, endosperm and germ powder produced during rice milling. , So-called bran is mixed. The bran layer left on the rice grains of milled rice is sharpened by "polishing rice" with tap water from ordinary households, and rinsed with water together with the mixed bran. Polished white rice is transferred from the rice-washing device to the rice cooker and cooked. Since the washed rice grains contain water, they tend to be more brittle and more fragile than dry rice grains.

FIG. 13 is a diagram showing the construction of a conventional automatic rice polishing apparatus disclosed in, for example, Japanese Patent Laid-Open No. 58-67217. In the figure, a is a rice washer, b is a rice cooker located below it, c is the body of the rice washer, d is a hopper, and e is a water level adjusting tube.
f is a discharge hole, g is a valve, h is a rod, i is a solenoid, j is a water supply pipe, k is a solenoid valve, l is a trough,
m is a drainage ditch, and n is a drainage pipe.

In such an apparatus, when a predetermined amount of rice is put into the main body c from the hopper d and then a switch (not shown) is turned on, a timer is activated to open a solenoid valve k, and water is supplied from a water supply pipe j as indicated by an arrow. The water is sent as in the above and flows in from the lower end of the trough 1. Due to this inflow, the rice in the main body c is also drawn into the trough l, is discharged from the upper part of the trough l, and is drawn again to be circulated and washed. Excessive water in the main body c overflows into the drain m,
It is discharged from the drain pipe n. After supplying water for a predetermined time and washing rice, the solenoid valve k is closed by the operation of the timer.
Next, the solenoid i is activated and the rod h is pulled up to open the valve g. When the valve g is opened, the washed rice in the main body c and the water of which the amount is adjusted by the water level adjusting pipe e are dropped into the rice cooker b through the discharge hole f.

[0005]

Since the conventional automatic rice polishing apparatus is constructed to wash rice with water as described above, a pipe for supplying and discharging water for washing rice is provided. However, there was a problem that the water supply / drainage work and ancillary equipment for that purpose were required. In addition, measures to prevent the occurrence of mold based on the use of water that easily causes mold,
Hygiene measures are also indispensable, and the size of the device as a whole must be increased. In particular, unlike rice polishing, which allows you to sharpen the rice with your eyes, it mechanically grinds it, so the rice grains that become fragile due to water crush and the quality of cooked rice declines. There was a fatal problem of reducing the precision of polishing.

In view of the above points, the present invention is capable of sharpening rice without using water, eliminating the need for special water supply / drainage equipment for polishing rice, and is hygienic and cooked cooked rice. The purpose of the present invention is to obtain a dry-type rice polishing apparatus with high rice polishing accuracy that does not cause the rice grains to be crushed.

[0007]

A dry type rice polishing apparatus according to the present invention has an outer case for accommodating rice, and a rice feed port and a rice intake port in the upper and lower portions, respectively. With an outer cylinder rotatably provided around the axis of the direction, a drive source for driving the outer cylinder, and slits for grinding and embryo removal, and arranged coaxially in the outer cylinder. A ring-shaped polishing chamber with a variable clearance is formed between the outer cylinder and the outer cylinder, and the inside constitutes a recovery duct for separating and recovering the bran generated during polishing. The inner cylinder of, and provided on the outer peripheral surface of the inner cylinder at a portion corresponding to the intake,
A spiral for guiding the rice introduced into the rice polishing chamber from the storage chamber formed between the outer case and the outer cylinder to the delivery port side, and the rice in the storage chamber on the upper surface due to its own weight, the intake port. It has an inclined surface set at an inclination angle sufficient to slide to the side, and is provided with an inclined ring installed in the lower portion of the storage chamber.

[0008]

In the present invention, the rice in the storage chamber slides down the inclined surface of the upper surface of the inclined ring which is the bottom of the storage chamber, and is formed between the outer cylinder and the inner cylinder one after another from below the rotating outer cylinder. It is taken into the rice polishing room. The rice grains taken into the polishing room move in irregular directions due to the change in the size of the gap in the polishing room and are stirred, while being guided to the outlet side by the spiral of the inner cylinder, and the rice as a whole Pushed up.
During the ascending, the bran layer and the germ on the surface of the rice grain are scraped off or polished by the contact of the slit for polishing rice or the slit for cutting embryo or the rice grains provided in the inner cylinder. Then, the white rice pushed up to the upper part of the rice polishing chamber while being subjected to the rice polishing action is delivered from the delivery port. Further, the bran and the mixed dust are dropped into the collection duct through the gap of the slit of the inner cylinder and collected.

[0009]

The present invention will be described below with reference to the illustrated embodiments.

FIG. 1 is a structural explanatory view of an embodiment of the present invention, and FIG. 2 is a sectional view taken along line AA. In FIG. 1, 1 is a substrate, 2
Is an electric motor fixed to the substrate 1 and provided with a reduction mechanism, and 3 is an output shaft thereof. Reference numeral 4 is a drive pulley, 5 is a belt, and 6 is a driven pulley. As the belt 5, here, a timing belt in which slippage does not occur during transmission of torque is used, and tooth shapes corresponding to the teeth of the timing belt are also formed on the outer circumferences of both pulleys 4 and 6.

Reference numeral 10 is a main body of the rice polishing apparatus. Reference numeral 20 denotes a cylindrical outer case of the main body 10, which is divided into an upper case 21, an intermediate case 22 and a lower case 23. Two
Reference numeral 4 designates a plurality of connecting fittings provided above and below the intermediate case 22, which connects the upper case 21 and the lower case 23 to the intermediate case 22.
Removably connect the top and bottom. The outer case 20 is made of, for example, a transparent resin, and the vicinity of the lower case 23 is fixed to the substrate 1. Reference numeral 25 is a plurality of columns, and 26 is a mounting plate. The mounting plate 26 is horizontally mounted below the lower case 23 by a column 25 with a space. 27 is a U-shaped holding frame, and 28 is a tray. The tray 28 is arranged in the holding frame 27 and collects the bran and the like separated by the later-described polishing operation. 31 is an annular lower bearing seat fixed to the lower case 23 and the mounting plate 26, 32 is two ball bearings, 33
Is a drive shaft supported by both ball bearings 32. Drive shaft 33
A driven pulley 6 is attached to the.

Reference numeral 41 denotes an inclined ring fixed to the lower side in the intermediate case 22. On the upper surface thereof, rice in a storage chamber formed between the intermediate case 22 and an outer cylinder 60, which will be described later, is moved toward the center of the ring by its own weight. An inclined surface 42 is provided which has an inclination angle sufficient to slide down. Reference numeral 43 is a surface bearing with a flange, and 44 is a driven shaft. The driven shaft 44 is supported by the surface bearing 43 and is connected to the drive shaft 33.

Reference numeral 51 is an upper bearing seat provided on the upper case 21, 52 is a surface bearing, 53 is a dust seal, and 54 is an annular shaft supported by the surface bearing 52. Further, 55 is a top plate fixed to the upper case 21, 56 is a rice feeding path, 5
7 is an outlet. The upper and lower ends of the driven shaft 44 and the annular shaft 54 are formed in a hexagonal shape on the inner surface side in conformity with the outer shape of the outer cylinder 60, and on the outer peripheral side in a circular shape corresponding to the surface bearings 43 and 52 (the driven shaft). 44 refer to FIG. 2).

Reference numeral 60 denotes an outer cylinder, and reference numeral 70 denotes a cylindrical inner cylinder which is disposed inside the outer cylinder 60 in the axial center XX direction. An annular shaft 54 and a driven shaft 44 are fitted and integrally attached to the upper and lower ends of the outer cylinder 60, and are rotatably supported in the outer case 20 by surface bearings 52 and 43. 63 is a driven shaft 4
4 is an intake provided at a plurality of positions in the circumferential direction in the upper part of 4.

Reference numeral 71 is a slit that penetrates the inside and outside of the inner cylinder 70. The slits 71 are divided into four groups arranged in the axial center XX direction at an interval of approximately 90 degrees in the middle of the inner cylinder 70. As shown in FIG. Is inclined by an angle θ (in the embodiment, θ is about 25 degrees). The slit 71 has a groove width Ws smaller than the thin thickness Wr of the rice grain, Ws <Wr, so that the rice grain does not pass through the slit 71.
No. 3 is not chamfered and is formed in a sharp shape (see FIGS. 7 and 8). Of the many slits 71 provided in the vertical direction of the tubular portion of the inner tube 70, the slit 71 in the upper layer portion is shown in FIG.
The germ removal claw 72 as shown in FIG. The tip of the germ removal claw 72 forms an arcuate blade, and this blade portion obliquely projects to the outside of the inner cylinder 70.

Reference numeral 73 is a mesh formed on the upper portion of the inner cylinder 70. The mesh 73 has a thickness of 0.5φ and a length and width of 1
3.4 A thin wire made of metal such as stainless steel is woven into a net shape. It is made in a "Yatsuhashi" shape with a rectangular arc surface, and the inner cylinder is spaced at 90-degree intervals corresponding to the slit 71. It is provided on the peripheral surface of 70. 74 is a fixing plate fixed to the upper end of the inner cylinder 70, and 75 is a fixing screw. The fixing plate 74 is fixed to the upper plate 55 by fixing screws 75, and has a function of restricting free rotation of the inner cylinder 70 (see FIG. 5).

Reference numeral 76 is a spiral. Spiral 76
Is formed in the middle of the inner cylinder 70 so as to face the intake port 63, and slides down on the inclined surface 42 of the inclined ring 41 to guide the rice taken in from the intake port 63 to the delivery port 57 side. . The inner cylinder 70 in which the slits 71, the mesh 73, etc. are formed is set to be longer than the outer cylinder 60 on the outer side, and is suspended from the upper surface plate 55, and the driven shaft 44 and the drive shaft 3 are halfway.
The lower end is exposed in the holding frame 27 through the hollow part of 3.

Reference numeral 12 denotes polished rice before being polished, 13 is polished rice polished by a polishing device, and 15 is a bran mainly containing bran containing germ powder and dust mixed in the polished rice, It is separated from milled rice 12 by polishing rice. 16 is the germ pore.

Thus, the annular space formed between the outer case 20 and the outer cylinder 60 is a storage chamber R1 for temporarily storing the rice to be polished, the hexagonal outer cylinder 60 and the circular inner cylinder 70. The annular gap between and forms a polishing room R2, and the inner space of the inner cylinder 70 constitutes a recovery duct R3 for recovering the bran fraction 15 separated from the rice polishing 12. Based on the experimental results, the maximum value Lm and the minimum value Ln of the gap in the direction orthogonal to the axis XX of the rice polishing room R2 are Lm ≦ 2Lr and Lr, respectively, when the length of a normal rice grain is Lr. It is selected to fall within the range of ≧ Ln (FIGS. 6 and 7).

The polishing operation of the apparatus of this embodiment having such a structure will be described with reference to FIGS. 1 to 9. The milled rice 12 is loaded into the storage chamber R1 through the loading path 56 of the upper case 21, and is deposited and stored from the inclined surface 42 at the bottom. A part of the milled rice 12 put into the storage room R1 slides down on the inclined surface 42 and enters the vicinity of the bottom of the rice polishing room R2 from the intake 63.

When the electric motor 2 is driven at a constant speed, the rotational force of the electric motor 2 causes the output shaft 3, the drive pulley 4 and the belt 5 to rotate.
Is transmitted to the driven pulley 6 on the main body 10 side. The rotational force transmitted to the driven pulley 6 is further transmitted to the drive shaft 33 and the driven shaft 44, and the outer cylinder 60 supported by the surface bearings 43 and 52 at the lower and upper portions starts rotating in the arrow direction of FIG. Outer cylinder 6
When 0 rotates, the milled rice 12 that has slid on the sloped surface 42 of the sloped ring 41 is forcibly pushed into the rice polishing room R2 from the three inlets 63 under the pressure of the upper milled rice 12. To be The milled rice 12 that has been pushed in receives the pushing force of the milled rice 12 that has been pushed in subsequently, and is pushed up into the polishing room R2 together with the milled rice 12 that has already entered. At the same time, a force F having components Fk and Fv in the horizontal and vertical directions is applied to the rice grains pushed from the intake 63 and contacting the spiral 76 by the rotating outer cylinder 60, as shown in FIG. The force F inclined by the spiral angle α cooperates with the pushing force by the pressure from the inclined surface 42 and the rice polishing 12 above it to push up the rice 12 into the polishing room R2. The individual rice grains pushed up are separated by a gap L due to the difference in cross-sectional shape between the rotating hexagonal outer cylinder 60 and the fixed circular inner cylinder 70.
Due to the change of m-Ln = δ, the milled rice 12 as an aggregate moves while being moved in an irregular direction and being stirred,
Go up in 2.

In this case, the rice grains rising while coming into contact with the inner cylinder 70 are partially fitted in the slits 71 as shown in FIG. 8, and the bran layer on the surface is formed at the sharp edge 73 of the slits 71. It is scraped off. In addition, the bran layer is peeled off even when the rice grains are rubbed together by the weight from the upper layer in the polishing room R2 and the pushing up from the lower layer. In addition, the rice grains that have risen near the slit 71 for cutting embryos and made the germ holes 16 face the germ removal claws 72, the germ remaining in the germ holes 16 and the germ powder accumulated are scraped off. Further, the rice grains reaching the upper part of the polishing room R2 are rubbed and polished by the mesh having the arc surface of the mesh 73. Furthermore, the surface of each rice grain is polished by the friction of the rice comrades. Then, the scraped bran powder and germ powder, and the mixed small dusts, etc.
5 passes through the gap between the slit 71 and the mesh 73 to the side of the collecting duct R3 to be separated from the milled rice 12, drops through the collecting duct R3, and is collected in the tray 28.
In this way, the rice polishing room R undergoes grinding and polishing in a dry state.
The white rice 13 pushed up to the upper part of 2 is delivered from the delivery port 57. After that, it was moved from the rice polishing process to the rice cooking process,
It is put into a rice cooker, an appropriate amount of water is added, and then heated to cook rice.

Here, letting Q be the amount of rice milled 12 introduced into the rice polishing room R2, K be the degree of rice polishing, and N be the number of rotations of the outer cylinder 60, the relationship shown in FIG. 9 is obtained. Polished rice 12
As shown by the curve q, the delivery amount Q of the signal increases as the speed increases from a low speed, reaches a constant value when n2 is exceeded, and sharply decreases when n3 is exceeded. On the other hand, the polishing degree K indicated by the curve k shows a higher value at a low speed near n1 where the delivery amount Q is small, and decreases in inverse proportion to the increase of the rotation speed N. Therefore, the rotation speed N of the outer cylinder 60 is set to the two curves q
The rice polishing efficiency can be kept high by selecting it near the rotational speed na corresponding to the point p where k and k intersect. Further, by utilizing the relationship that the characteristic of the curve k is almost inversely proportional to the rotation speed N, it is possible to set the polishing degree K according to the customer's request in a wide range from brown rice to white rice based on the rotation speed N. it can.

FIG. 10 is a cross-sectional view of the essential parts of another embodiment of the present invention. In this embodiment, the outer case 20 is formed in a quadrangle, and the quadrangular inclined ring 41 is fixed inside the outer case 20, and the rice in the storage chamber R1 slides on the upper surface of the inclined ring 41 toward the center of the ring due to its own weight. Is provided with an inclined surface 42 set to a sufficient inclination angle. Further, as shown in the figure, the axis Oo of the outer cylinder 60 and the axis Oi of the inner cylinder 70 are
It is configured so as to be eccentric by shifting the distance ε. In particular, FIG.
A slit 71 for embryo cutting having a germ removal claw 72 shown in 1 is provided on the side surface of the inner cylinder 70 facing a position having a large gap in the rice polishing room R2. On the other hand, the grinding slit 71 shown in FIG. 12 faces a position in the polishing chamber R2 with a narrow gap.

In this embodiment, when the outer cylinder 60 is rotated by the electric motor 2, the milled rice 12 is moved to the polishing room R2 as described above.
It is pushed up inside. Then, when the rice grains are in a dense state at a narrow gap in the polishing room R2, the bran layer on the surface is scraped off by the slit 71. Further, when the rice grains move while rising and reach the position of the wide clearance, the degree of freedom increases and the moving range becomes wider. As a result, the germ removal claw 72 of the slit 71 for embryo cutting is fitted into the germ hole 16 of the rice grain, and the bran accumulated in the germ hole 16 and a part of the remaining germ is left by the germ removing claw 72. Will be scraped off. In this way, since the outer cylinder 60 and the inner cylinder 70 are configured so as to be eccentric to each other, the kneading of the rice grains becomes severe, and the rice polishing operation such as grinding is strengthened and effectively performed.

In the above-mentioned embodiment, the case where the outer cylinder 60 is formed by forming the plate material into a hexagonal shape is illustrated and described, but the outer side may be circular and the inner side may be integrally formed into a hexagonal shape, and the square shape is also illustrated. It is not limited to hexagons, in short
The gap between the two gaps may be changed. Further, although the germ removal claw 72 is provided on the downstream side of the slit 71, it may be provided on the upstream side or both sides, and the position, number, etc. of the slit 71 are not necessarily limited to the respective embodiments. Further, in the embodiment, the description has been given of the case where the inner cylinder 70 and the outer cylinder 60 are arranged concentrically with the axis XX being vertical, but the axis XX is an angle of about 0 to 60 ° with respect to the vertical. You may incline and arrange. In addition, an annular storage room R1 is provided around the rice polishing room R2 to introduce the milled rice 12 into the rice polishing room R2 from the three inlets 63. The milled rice 12 may be taken into the rice polishing room R2 through one inlet. Also, the case where the rice that has moved up from the rice polishing room R2 is sent out from the outlet 57 as it is has been described.
A switching valve for switching between the delivery port 57 and the storage chamber R1 may be provided near the upper part of the recirculation. If a reflux system is used, the degree K of polished rice can be further improved. Further, although the operation of the polishing process for making the polished rice 12 into the polished rice 13 has been described, the inner cylinder 70 and the outer cylinder 60 are made of a wear-resistant metallic material and are used for polishing the brown rice directly into the polished rice. You can also

[0027]

As described above, according to the present invention, since the rice is ground without using water, the supply / drainage work of the water supply / drainage system for washing rice and ancillary facilities are unnecessary. In addition, there is no need for hygiene measures such as measures for preventing mold and spoilage associated with the use of water, and there are few measures for corrosion, and the device can be made smaller and compact as a whole. In addition, since the dried rice grains are ground, there is no problem that the rice grains are not crushed and the quality of cooked cooked rice is deteriorated to deteriorate the polishing accuracy. Further, since the rice in the polishing chamber is conveyed by the inclined surface of the inclined ring installed in the lower part of the storage chamber and the spiral provided in the inner cylinder, the conveying mechanism becomes simple and the loss of rotational force is reduced.

[Brief description of drawings]

FIG. 1 is a structural explanatory view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a vertical sectional view of the vicinity of a rice polishing room.

FIG. 4 is an enlarged view of a slit for embryo removal.

FIG. 5 is a top view of an inner cylinder.

FIG. 6 is an explanatory diagram of a rice polishing operation.

FIG. 7 is an explanatory diagram of a rice grain transportation state.

FIG. 8 is an explanatory diagram of a polishing operation of a slit.

FIG. 9 is a characteristic diagram of polishing degree and delivery amount.

FIG. 10 is a cross-sectional view of essential parts of another embodiment of the present invention.

FIG. 11 is a perspective view of an inner cylinder.

FIG. 12 is a perspective view of the inner cylinder seen from another angle.

FIG. 13 is an explanatory diagram of a configuration of a conventional device.

[Explanation of symbols]

 2 Electric motor (driving source) 12 Polished rice 13 White rice 15 Bran 20 Outer case 41 Tilting ring 42 Tilted surface 57 Outlet 60 Outer cylinder 63 Intake 70 Inner cylinder 71 Slitting embryo slit 72 Germ removal claw 76 Spiral R1 storage room R2 Lab US room R3 recovery duct

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuo Otsuka 2-14-40 Ofuna, Kamakura-shi Mitsubishi Electric Corporation Life Systems Research Institute

Claims (1)

[Claims] 1. An outer case for accommodating rice, a rice outlet and a rice intake in the upper and lower parts, respectively, and an outer case provided rotatably around a vertical axis in the outer case. A cylinder, a drive source for driving the outer cylinder, and slits for grinding and embryo cutting, and are arranged coaxially in the outer cylinder so that a clearance gap changes around the outer cylinder. A ring-shaped rice polishing chamber is formed, and a fixed inner cylinder that constitutes a recovery duct for separating and collecting the bran generated in the rice polishing is formed on the inner surface of the inner cylinder. A spiral provided at a portion corresponding to the inlet, which guides the rice introduced into the polishing chamber from the storage chamber formed between the outer case and the outer cylinder to the outlet side, and the spiral on the upper surface. Rice has an inclined surface set at an inclination angle sufficient to slide down to the intake side due to its own weight. And a tilting ring installed at the bottom of the storage chamber.