JP6893440B2 - Rice milling blade and rice milling machine - Google Patents

Description

The present invention relates to a rice milling blade used in a rice mill for milling brown rice at home, and particularly to a blade shape that rotates on the bottom surface of a bran removing container to efficiently convect rice.

As is known in Patent Document 1 and the like, this type of rice milling machine includes a rice milling basket made of a metal mesh material into which rice (brown rice) is put, a bran container in which the rice milling basket is housed at intervals, and rice milling. It is equipped with a rice milling blade provided at the bottom of the basket and a lid attached to the upper surface of the bran container. By rotating the rice milling blade, brown rice is convected in the rice milling basket, and friction between rice or between the rice and the inner surface of the rice milling basket. The bran layer of brown rice is peeled off.

In such a so-called convection rice mill, the residual germ and the reduction of crushed rice are permanent issues. The cracked and small rice is sticky and has a bad taste because starch flows out into the water as glue, and it does not look good. By the way, the germ peeling and the occurrence of crushed rice due to rice milling are largely due to the friction between the rice and the inner peripheral surface of the rice milling basket. It is considered that this is because the friction between the rice and the inner peripheral surface of the rice-milled basket has a greater impact on the rice than the friction between the rice. On the other hand, since the friction between rice is the contact of the same thing, the impact on the rice is small, and in addition, the adsorption force of the bran interacts with each other, so that the peeling efficiency of the bran is high.

The rice milling blade of Patent Document 1 extends horizontally from a substantially cylindrical main body and the lower side of the main body toward the inner peripheral surface of the rice milling basket, and its tip is raised in a substantially L shape, and this rising portion is raised. It is composed of a plurality of blades having a shape in which the side trailing the direction of rotation of the rice is bent inward. Due to the rotation of the rice milling blades, the brown rice contained in the rice milling basket is pushed to the inner peripheral surface of the rice milling basket by centrifugal force and then rises along the inner peripheral surface of the rice milling basket for rice milling from the center of the rice milling basket. Convection so that it flows down along the main body of the blade. Due to this convection, the brown rice moves so that it is high on the inner peripheral surface side of the rice milling basket and low on the central side, and the brown rice is de-braned by the friction between the rice grains and the inner peripheral surface of the rice milling basket. However, basically, the rate of peeling the bran layer increased due to friction between the rice and the inner peripheral surface of the rice milling basket, and the rice milling operation was such that germs were less likely to remain and crushed rice was likely to occur.

Japanese Unexamined Patent Publication No. 2000-210575

Therefore, the present invention is based on the finding that rice can be efficiently milled by friction between rice, and the ratio of de-bran removal due to friction between rice milling cages is reduced, germs are likely to remain, and rice milling is efficiently performed while suppressing the occurrence of crushed rice. It provides a rice milling feather that can be used.

In order to solve such a problem, the present invention comprises a rice-milled basket having a plurality of rice bran outlets smaller than rice grains, a rice container attached to the upper surface of the rice-milled basket, and a bran receiving container containing the rice-milled basket. A rice milling blade attached to a rotating shaft of a rice milling machine provided with a rotating shaft protruding from the inner bottom surface of the rice milling basket, a motor for driving the rotating shaft, a bran receiving container, and a main body case for accommodating the motor. From the primitive shape of the strip-shaped flat plate, the end portion is bent upward to form a flat surface portion and a rising portion, and a twisted portion is formed on the flat surface portion so that the rising portion tilts forward by a predetermined angle in the rotation direction side. It is characterized by.

Further, in the rice milling blade of the present invention, the flat surface portion has a gap with the inner bottom surface of the rice milling basket, and the rising portion has a gap with the inner peripheral surface of the rice milling basket. It is characterized in that it is attached so that the rising part is equal to or higher than the height of the inner peripheral surface of the rice milling basket.

According to the rice milling blade of the present invention, since the twisted portion is formed on the flat surface portion so that the rising portion tilts forward by a predetermined angle in the rotation direction side, the inner peripheral surface of the rice milling basket is centrifugally applied to the rice by the rotation of the blade. In addition to the lateral convection toward the rice, the vertical convection that is blown upward along the twisted part is added, the rice is actively rubbed against each other, the ratio of contact with the inner peripheral surface of the rice milling basket is reduced, and the germ remains. Rice milling that is easy and suppresses the occurrence of crushed rice is realized.

Further, by setting the rising portion of the rice milling blade to be equal to or higher than the height of the inner peripheral surface of the rice milling basket, the ratio of rice contacting the inner peripheral surface of the rice milling basket can be further suppressed.

It is an internal sectional view of the rice milling machine of this invention. It is a structural exploded view of a rice milling machine. It is explanatory drawing which shows the assembly method of the rice milling machine. It is explanatory drawing which shows the structure of the rice milling blade 12. It is explanatory drawing which shows the convection of rice at the time of rice milling.

The configuration of the rice milling machine will be described with reference to FIGS.
Reference numeral 1 denotes a main body case, the inside of which is divided vertically by a partition wall 2, a motor chamber 3 is formed in a lower space, and a storage chamber 4 is formed in an upper space. A motor 5 is provided in the motor chamber 3, and a rotating shaft 6 of the motor 5 penetrates the partition wall 2 and projects toward the accommodating portion 4, and a lower coupling 7 is attached to the upper end thereof. The motor 5 employs a DC brush motor that outputs high torque and high rotation speed.

Reference numeral 8 denotes a bran container, which is housed in the storage chamber 4 of the main body case 1 and forms a cylindrical portion 9 surrounding the rotating shaft 6 of the motor 5 and the lower coupling 7 at the center of the bottom surface. The cylindrical portion 9 has both a function of securing a storage space for the rice bran so that the rice bran does not spill into the storage chamber 4 of the main body case 1 and a function of positioning the rice milling basket, which will be described later.

Reference numeral 10 denotes a rice milling basket, which is composed of a hemispherical body formed by forming a bottomed perforated plate having a mesh smaller than that of rice grains, and sandblasting is performed on the inner surface of the perforated plate. In the rice milling basket 10, a rotating shaft 11 is passed through the center of the bottom surface, a rice milling blade 12 is attached to the upper end of the rotating shaft 11, and an upper coupling 13 connected to the lower coupling 7 is attached to the lower end. .. Further, the outer bottom portion is provided with an upper coupling 13 and a mounting cylinder portion 14 that is internally fitted into the cylindrical portion 9 of the bran container 8. Further, the upper edge opening is provided with an annular mounting portion 15 for connecting to a rice container described later.

As shown in FIG. 3, the rice milling blade 12 is fixed to the rotating shaft 11, and from the primitive shape of the strip-shaped flat plate, a flat surface portion 12a extending horizontally to the inner bottom surface of the rice milling basket 10 and the tip of the flat surface portion 12a are milled. It is composed of a rising portion 12b raised along the inner peripheral surface of the car 10 and a twisted portion 12c in which the flat surface portion 12a is bent so that the rising portion 12b tilts forward by a predetermined angle in the rotation direction side. In the rice milling blade 12, the flat surface portion 12a has a gap narrower than the inner bottom surface of the rice milling basket 10 and the length of the rice grains, and the rising portion 12b has a gap narrower than the inner peripheral surface of the rice milling basket 10 and the length of the rice grains. , Attached to the rotating shaft 11.

Reference numeral 16 denotes a rice container, which is made of a permeable or semi-transparent material and is formed in a cup shape, and a mounting portion 17 to be mounted on the annular mounting portion 15 of the rice milling basket 10 is formed in the opening. The rice container 16 is provided with a scale 18 for measuring rice on the outer peripheral surface thereof, and also functions as a measuring cup. The scale 18 may be a composite number notation for white rice or a rice amount notation for brown rice. That is, since 200 cc of brown rice becomes 180 cc of white rice by milling, it may be described as 200 cc of brown rice or 1 go of white rice on the scale. In this example, the scale 18 is marked in 0.5 go units from 0.5 go to 2 go for both brown rice and white rice.

Further, on the outer edge of the opening of the rice container 16, a convex portion 20 that engages with the groove portion 19 provided on the inner edge of the opening of the accommodating portion 4 is formed, and by engaging the convex portion 20 with the groove portion 19, the rice container 16 is formed. It is fixed to the upper surface of the main body case 1. Although not particularly shown, the rice bran container 8, the rice milling basket 10, and the rice container 16 are accurately placed in the main body case 1 at a position where the convex portion 20 of the rice container 16 engages with the groove portion 19 of the accommodating portion 4 to switch. It is equipped with a safety switch that detects that it is attached, and the motor 5 does not start unless this safety switch is turned on.

Here, the relationship between the rice-polishing basket 10 and the rice-polishing blade 12 will be described.
The rising portion 12b of the rice milling blade 12 is set so that the end portion on the side trailing the direction of rotation is raised by the twisted portion 12c, but this end portion is higher than the upper edge of the rice milling basket 10. In addition, the rice milling basket 10 is located at a position lower than the highest level of rice that rises along the inner peripheral surface due to the centrifugal force generated by the rotation of the rice milling blade 12 when milling the minimum amount of rice that can be milled (0.5 go in this case). The upper surface is set to. That is, the rice-polishing basket 10 has a height dimension to a position lower than the tip of the rising portion, which is the upper end of the rotation locus of the rice-polishing blade 12, and suppresses the ratio of rice in contact with the inner peripheral surface of the rice-polishing basket.

When the rice milling blade 12 is rotated in the rice milling basket 10, the flat surface portion 12a of the rice milling blade 12 rotates along the inner bottom surface of the rice milling basket 10, and the rice contained in the rice milling basket 10 moves to the inner peripheral surface by centrifugal force. To do. The rice that has moved to the inner peripheral surface of the rice milling basket 10 is moved upward along the inner peripheral surface of the rice milling basket 12 by the rising portion 12b of the rice milling blade 12, and is given a vertical movement that descends by passing through the rising portion 12b. The rice is removed by contact with the inner surface of the rice milling basket 10 and contact with each other. Further, the twisted portion 12c of the rice milling blade 12 generates convection that winds up a part of the rice moving to the inner peripheral surface and returns it to the center of the rice milling blade 12, and promotes the action of removing the rice bran by contact between the rice. .. As a result, the rate at which the rice comes into contact with each other and the bran is removed increases, and the rice is milled so that germs tend to remain.

Reference numeral 21 is a start / stop switch, and 22 is a rice milling adjustment switch, which are provided on the outer surface of the main body case 1 and operate the motor drive circuit 23 built in the main body case 1. Reference numeral 24 denotes a rotation detection element, which detects the protrusion of the disk 25 attached to the rotation shaft 6 of the motor 5 , detects the rotation of the motor 5, and outputs a pulse signal. As the rotation detection element 24, a known configuration such as a Hall element or a photointerruptor that outputs a pulse signal due to changes in magnetism, photoelectric, noise, or the like is adopted.

The start / stop switch 21 is a switch that turns on / off the motor 5 , and an LED lamp is embedded in the switch, and the energized state can be confirmed by lighting red. The rice milling adjustment switch 22 selects the degree of polishing of brown rice by the rotation position of the volume knob. In this example, the degree of polishing can be selected from 3 minutes, 5 minutes, 7 minutes, and white rice. .. The stage of the degree of milling is not limited to these.

The motor drive circuit 23 starts the motor 5 in response to the input of the start / stop switch 21, and detects the amount of rice from the load (voltage value, current value, power consumption, etc.) of the motor 5. Then, the rice milling time is determined according to the detected amount of rice, and during rice milling, the rotation speed of the motor 5 is detected by receiving a pulse signal from the rotation detection element 24, and this rotation speed is the amount of rice, the degree of milling, and the rice milling. The motor 5 is controlled so as to be constant regardless of the degree of progress.

The rice milling machine configured in this way is prepared by the following procedure shown in FIG.
(Procedure a) A predetermined amount of brown rice is placed in a rice container 16 and a rice polishing basket 10 is attached.
In this procedure a, the rice container 16 is used as a measuring cup, brown rice is weighed using the scale 18 as a guide, and an annular attachment provided on the outer surface of the opening of the rice milling basket 10 is provided on the attachment portion 17 provided on the inner surface of the opening of the rice container 16. The portion 15 is screwed in and mounted in a state where the upper surfaces face each other. As a result, it is possible to set an amount of rice larger than the capacity of the rice milling basket 10.

(Procedure b) The bran container 8 is attached to the main body case 1.
In this procedure b, the bran container 8 is set in the accommodating portion 4 of the main body case 1, and the bran container 8 is attached to the main body case 1. As a result, the rotating shaft 6 and the lower coupling 7 protruding from the bottom of the accommodating portion 4 are surrounded by the cylindrical portion 9 of the bran container 8.

(Procedure c) The rice milling basket 10 is attached to the bran container 8.
In this procedure c, the rice milling basket 10 to which the rice container 16 is attached in step a is inverted and attached to the main body case 1, and the rice milling basket 10 is housed in the bran container 8. As a result, the mounting cylinder portion 14 of the rice milling basket 10 is internally fitted and positioned in the cylindrical portion 9 of the bran container 8, the lower coupling 7 and the upper coupling 13 are joined, and the rotating shaft 6 of the motor 5 and the rice milling are performed. The rotating shaft 11 of the car 10 is directly connected.

(Procedure d) The rice container 16 is fixed to the upper surface of the main body case 1.
In this procedure d, the rice container 16 is fixed to the upper surface of the main body case 1 by engaging the convex portion 20 formed on the outer edge of the opening of the rice container 16 with the groove portion 19 provided on the inner edge of the upper surface opening of the accommodating portion 4. It is a thing. This state is detected by a safety switch (not shown), and the driving of the motor 5 is permitted.

From such a preparatory procedure, when the motor 5 is driven, the rotation of the motor rotating shaft 6 is directly transmitted to the rotating shaft 11 of the rice milling basket 10, and the rice milling blade 12 attached to the rotating shaft 11 is rotationally driven to mill rice. The brown rice in the basket 10 can be rotated. The convection of rice causes the rice to rub against each other, scraping the surface of the rice and scraping off excess bran. The peeled bran is discharged from the mesh of the rice milling basket 10 into the bran container 8 and stored in the bran container 8.

In the present invention, by improving the efficiency of convection of rice by the rice milling blade 12, the volume of the rice milling basket 10 is reduced, the ratio of bran removal by contact between the milled rice basket and rice is reduced, the germ survival rate is high, and the generation of crushed rice is generated. It is characterized by the reduction of. The rice milling blade 12 has a flat surface portion 12a extending horizontally to the inner bottom surface of the rice milling basket 10, a rising portion 12b in which the tip of the flat surface portion 12a is raised along the inner peripheral surface of the rice milling basket 10, and a rising portion 12b thereof. It consists of two blades having a twisted portion 12c in which the flat surface portion 12a is bent forward by a predetermined angle on the rotation direction side, and when the rice milling blade 12 is rotated, the rice is brought into the rice milling basket 10 by the centrifugal force of the flat surface portion 12a. It swells on the inner peripheral surface of the rice container 16 and is lifted along the inner peripheral surface of the rice milling basket 10 and the rice container 16 by the rising portion 12b. In addition, a part of the rice is wound upward by the twisted portion 12c near the center of the rice milling blade.

Due to such convection, the rice in the rice milling basket 10 and the rice container 16 rises when the rice milling blade 12 passes through the rising portion 12b and the rising portion 12b, as shown in FIG. 5A when viewed from the side. Due to the downward flow after passing through the rice, the convection is not a mere circular rotational movement, but an inclined convection in which the side preceding the rice milling blade 12 in the rotational direction becomes higher. This convection is generated by the two blades, creating vertical convection between the top of the ascending stream and the valley of the descending stream, facilitating contact between the rice. Further, as shown in FIG. 5B when viewed from a plane, the rice wound upward by the twisted portion 12c descends toward the center of the rice milling blade 12, so that vertical convection is performed even near the center of the rice milling blade. , The contact between rice is further promoted. For this reason, the rate at which the rice comes into contact with each other and the bran is removed increases, and the rice is milled so that germs tend to remain.

In addition, since the inner surface of the rice milling basket 10 is sandblasted, the processing efficiency of removing the bran by contact with the inner surface of the rice milling basket is improved as much as possible, and the rice bran is removed by contact with the rice milling basket. It is also a feature of the present invention that the bran is efficiently removed even if the ratio is reduced.

The rice milling operation in this rice milling machine will be described below.
The motor 5 is driven by setting the brown rice and the rice milling machine members in steps (a) to (d), selecting the desired rice milling degree with the rice milling degree adjusting switch 22, and inputting the start / stop switch 21. By driving the motor 5, the rotation of the motor rotating shaft 6 is directly transmitted to the rotating shaft 11 of the rice milling basket 10, and the rice milling blades 12 attached to the rotating shaft 11 are rotationally driven to convection the brown rice in the rice milling basket 10. The convection of rice causes the rice to rub against each other, scraping the surface of the rice and scraping off excess bran. The peeled bran is discharged from the mesh of the rice milling basket 10 into the bran container 8 and stored in the bran container 8.

The motor drive circuit 23 automatically detects the amount of rice set, and controls the motor 5 with a rotation drive time and a rotation speed according to the detected amount of rice and the set degree of rice polishing. During the rice milling operation, the rotation speed is always detected, and the rotation of the motor 5 is controlled within a range of the rotation speed ± 100 rpm set according to the amount of rice and the degree of rice polishing.

When the rice milling blade 12 is rotated by the drive of such a motor 5, the rice grains in the rice milling basket 10 and the rice container 16 are rotated and moved up and down by the above-mentioned convection, and the rice grains rub against each other and the skin is peeled off. The peeled bran is discharged from the mesh portion of the rice milling basket 10 into the bran container 8. The rice container 16 is made of a transparent material such as plastic or glass, and the state of rice polishing can be observed from the outside. When the rice milling time according to the degree of rice milling elapses, the motor 5 is stopped and the process ends.

After the rice milling is completed, the rice milling basket 10 and the rice container 16 are removed from the main body case 1, and if the rice milling basket 10 is removed from the rice container 16, rice remains in the rice container 16 and the bran remains in the bran container 8. It can be used. According to the test of the applicant, brown rice was ground by a weight ratio of 10% by the rice milling operation up to white rice.

Although this device is configured as described above, the present invention is not limited to the above configuration. For example, the motor 5 may be driven intermittently. By intermittently operating the motor 5, the rice repeats intonation due to the convection action when the rice milling blade 12 rotates and the settling action when the rice milling blade 12 stops. It has the effect of increasing the polishing time due to the friction of the rice, and as a result, the rice polishing time is shortened and the temperature rise of the rice is suppressed.

Further, the shape of the bran removing portion exemplified as the rice milling basket 10 in the above embodiment is such that the peripheral surface and the bottom surface of the bottomed container are all made of a net-like or perforated plate, and only the peripheral surface is made of a net-like or perforated plate. It is also possible to realize a structure or a structure in which only the bottom surface is made of a net or a perforated plate.

1 Main body case 4 Storage part 5 Motor 8 Bran container 10 Rice milling basket 12 Rice container 22 Rice milling adjustment switch 23 Motor drive circuit

Claims (3)

A rice-polished basket with multiple outlets smaller than rice grains,
A rice container attached to the upper surface of the rice milling basket and
The rice bran receiving container inside the rice-polishing basket and
A rotating shaft protruding from the inner bottom surface of the rice milling basket,
The motor that drives the rotating shaft and
A main body case for accommodating the bran receiving container and the motor ,
A rice milling blade attached to the tip of the rotating shaft protruding from the inner bottom surface of the rice milling basket, and
With
The rice wings, from primitive shapes of rectangular flat plates, together with bent ends upwardly flat portion and the rising portion is formed, said plane as the standing upper a predetermined angle anteversion on the side one rotational direction A rice milling machine characterized in that a twisted portion is formed from the portion. Has an inner bottom surface and clearance of the flat portion is the rice basket, so that the raised portion has an inner peripheral surface and the clearance of the polished rice basket, attached to the tip of the rotary shaft that protrudes on the bottom center of the rice basket The rice milling blade has a rising portion higher than the inner peripheral surface of the rice milling basket having the bran outlet .
The rice milling machine according to claim 1 , wherein the volume of the rice milling basket is smaller than the volume of the rice container . A rice milling blade whose primitive shape is a strip-shaped flat plate, which is attached to a rotating shaft so that the length of the flat plate extends in the radius of gyration and has one side and the other side in the direction of rotation.
A flat surface portion formed so as to extend horizontally inward in the radial direction of the flat plate,
A rising portion formed so as to rise from the horizontal on the outside in the radial direction of the flat plate, and
With
The flat plate is bent from the flat surface portion to the rising portion so that the length of the other side portion in the flat surface portion is shorter than the length of the one side portion in the flat surface portion, and from the flat surface portion to the rising portion. The other side of the space is gradually raised toward the outside in the radial direction of rotation.
Rice milling feathers that are characterized by that.

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