JPH0938509A - Rice polishing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently remove dungs of rats mixed into brown rice by carrying out the grain size selection utilizing slits slightly larger than rice grains or the photoelectric selection utilizing the difference of color or brightness in the process prior to the process of using a rice polisher in a rice mill plant. SOLUTION: Raw material brown rice grains are fed from an opening end 11 into a selection cylinder 1 with selection slits 3 opened on a peripheral face 5, and pressure is applied in the direction of a foreign matter discharge outlet 13 by a fluid such as air, and when a revolving shaft 9 is revolved in the above state, the transfer force heading for the foreign matter discharge outlet 13 and the revolving force of a slat 7 are applied to the brown rice. At that time, matters to be selected receive the pressing force while being revolved in the selection cylinder 1, and the brown rice grains are flowed from the selection slits 3 to the outside because of their small friction coefficients. On the other hand, dungs of rats mixed into the raw material brown rice grains are not flowed out of the selection slits 3 but discharged out from the foreign matter outlet 13. The selection of dungs of rats can be so constituted as to be removed by the photoelectric selection utilizing the difference of color or brightness.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a rice polishing method suitable for removing rat feces.

[0002]

[Prior Art] To finish brown rice into polished rice for business purposes,
Generally, it is carried out by a so-called rice milling plant incorporating a sorting device.In these rice milling plants, foreign matter such as stones and fragments of storage bags mixed at the time of harvesting and storage before the process of the rice milling machine is carried out. To be removed. To remove this foreign matter, a known stone removing machine that utilizes the difference in specific gravity from rice grains for stones is also known for non-granular foreign substances that are significantly larger than brown rice grains, such as fragments and strings of storage bags. The selection by the rough selection machine is used. In addition, in the process after passing through the rice polishing machine, known grain size selectors (shifters) that remove crushed grains generated in the rice polishing process and bran balls that are peeled off after adhering to the transportation path after the rice polishing process, and whitening A known color sorter or the like for removing burnt rice (black particles) in the rice grains is installed. As described above, the reason why the sorting machine installed in the pre-process of the rice milling machine and the sorting machine installed in the post-process are separated is as follows. In other words, the grain size sorter (shifter) cannot remove the crushed grains and bran balls that are mixed in the milled rice unless it is a post-process of the rice mill, and the color sorter is installed in the post-process as the polished rice. This is because the burnt rice in the inside has a black-and-white color difference, which improves the selection efficiency, and is much more efficient than removing the burnt rice in the yellow-brown brown rice. Therefore, in the previous step of the rice polishing machine, the grain size selection of foreign matters slightly larger than the rice grain and the color selection were not performed.

By the way, even in the conventional rice milling plant using these sorters, rat feces may be removed by chance, but it was extremely rare. However, it is recognized that the selective removal rate is not low, but only that amount is mixed in, and thus it has been considered sufficient as a removal measure. Even if it is overlooked to some extent in the specific gravity selection with a stone removing machine, it was thought that the removal of the black rat feces in the white polished rice grains was perfect with the color selection machine that selects by the difference in color (white and black). Is. Moreover, there was no rat feces in the grain of the polished rice actually commercialized.
In this way, as a conventional measure for removing rat dung in rice grains, it is completely removed by the color sorter installed in the subsequent process of the rice polishing machine, and no one feels any doubt about it. It was It has also been recognized that the rate of rat feces contamination is insignificant.

[0004]

However, as a result of detailed research on the ecology of rats, the present inventor may have found that the amount of rat feces removed by color selection or the like is small, or that rat feces are selected. I thought that it might be wrong to do the removal after the process of the rice milling machine. In other words, if the rat dung is not removed by the time the brown rice is passed through the rice mill (in the process before the rice mill), the rat dung will enter the rice mill along with the rice grains. In that case, Since feces are much softer and more viscous than rice grains, they are ground into rice grains by high-pressure grain friction in the rice-polishing machine and applied on the surface of the polished rice. We paid attention to the possibility that there are few rat feces in the discharged milled rice. And through real research, he discovered some astonishingly unknown facts. According to the measurement by the present inventor, it was found that rat feces of a size as described later were actually mixed in an average of 3 per ton of brown rice. It was further found that the rat dung selected by the conventional stone removing machine has a particularly high specific gravity for some reason, and the rat dung selected by the color sorter after the rice polishing process also has For some reason, it is a strong one that is particularly hard to break so that it can withstand the high pressure of a rice mill, and all of them are abnormal feces as rat faeces. Is the same as or lighter than the rice grain, and therefore it is not removed by the stone removing machine and enters the rice polishing machine while being mixed in the brown rice. Moreover, since these feces have no strength and are soft and viscous, they are high pressure together with the rice grain group in the rice polishing machine. The point is that the original shape disappeared because it was ground as a result of stirring and was smeared on the polished rice grains. Therefore, the feces that were discharged from the rice mill as they were in conventional grains were
It can be seen that it was a special hardened dung that was difficult to be crushed for some reason and was extremely rare. In other words, the polished rice discharged from the rice mill had almost no rat feces that kept its original shape, and at the stage of brown rice, both brown rice and rat feces were dark, so it was possible to distinguish with the naked eye. Because it was difficult, no one was aware of the existence of the mixture. Furthermore, no one knew that feces had been painted on the surface of polished rice grains as a product. Therefore, the polished rice we were eating was
Even though it was washed with rice before the rice was cooked, I was shocked to find out that it was covered with rat droppings.

Therefore, it is necessary to completely remove the rat dung mixed in the brown rice. Even if it is considered to remove the rat dung at the stage of brown rice by the above-mentioned known method, the size of the brown rice grain is large. The size and shape are 5 to 5.5 mm x 2.9 to 3 m
The size and shape of the rat feces is about 15 to 20 mm x 3 to 4 while the flat shape is m x 1.7 to 2.3 mm.
mm spindle shape or sausage shape, and slightly larger or about the same size as the brown rice grain. Therefore, it should not be possible to remove the larger foreign matter with the above-mentioned coarse selector. As described above, most of the rat droppings have a small difference in specific gravity from rice grains and cannot be removed by a stone removing machine for specific gravity selection.

In addition to the above examples, the present inventor also considered that there is no grain size selection device for removing foreign substances mixed in brown rice, and this device may be used for removal of rat feces. .
An example of the device is shown in FIG. FIG.
Represents a cross-sectional structure of a conventional grain size selection device 50.
In the illustrated example, a sorting cylinder 54 having a large number of small holes 52 formed in the wall surface is fixedly installed substantially horizontally, and a stirring blade 58 is attached to a screw blade 56 provided in the sorting cylinder 54. . The raw brown rice is fed from the feeding port 60 and conveyed to the discharging port 62 in the sorting cylinder 54 by the rotation of the screw blades 56. At this time, the raw brown rice transferred in the sorting cylinder 54 is stirred by the rotation of the stirring blade 58, and the minute foreign matter contained is discharged from the peripheral surface of the sorting cylinder 54. That is, the present apparatus takes out the majority of brown rice grains from the tip of the sorting cylinder 54, while taking out a minute amount of mixed foreign matter from the peripheral surface of the sorting cylinder 54, and the foreign matter to be removed is limited to minute foreign matter. I will end up.

As described above, the above-mentioned conventional grain size selecting device 5 is used.
0 was intended for the removal of a small amount of minute foreign substances mixed in the majority of brown rice grains, and foreign substances slightly larger than brown rice grains or foreign substances having the same volume could not be removed. Further, the diameter of the small holes 52 of the sorting cylinder 54 is made slightly larger than the grain of brown rice so that the majority of brown rice grains are discharged from the wall surface of the sorting cylinder 54, while a small amount of foreign matter is discharged from the tip of the sorting cylinder 54. However, as is clear from the structure of the figure, although the brown rice grains are discharged from the small holes 52, most of them flow down from the discharge port 62 as well, and in order to avoid it, the processing capacity is remarkably high. Will fall.

Further, as another method for removing the foreign matter, there is a method of using a mesh sieve, which is generally used. When using this mesh sieve, as shown in FIG. 15, the opening diagonal length x of the mesh 64 is naturally set to be slightly longer than the long diameter of the brown rice grain. However, if the opening diagonal length x is set in this way, the opening 66 becomes large, so that only a considerably large foreign substance can be removed. Moreover, unless the brown rice grains are inclined with respect to the opening 66, they cannot pass through the mesh 64, resulting in a significant decrease in processing capacity. Therefore, in order to enable the mesh 64 to pass through regardless of the direction of the brown rice grain with respect to the opening 66, a method of setting the opening side length y of the mesh 64 to be slightly longer than the major axis of the brown rice grain is used. The opening 66 of the mesh 64 becomes larger, and only extremely large foreign matter can be removed. And, of course, this does not remove the rat feces.

As explained above, there was no suitable sorter for removing the rat feces by grain size sorting before passing the brown rice through the rice milling machine. Moreover, there was no sorting means other than grain size sorting. For example, there was no idea of using a color sorter for the purpose of selective removal of polished rice "burnt rice" to remove rat dung in brown rice, and even if there was, it would be a normal color sorter, The selection rate of feces was so low that it could not be selected. There was no idea of removing feces in brown rice with other sorters, and there was no sorter having that function.

[0010]

[Means for Solving the Problems] As described above, it was confirmed that the amount of rat feces mixed in the rice-polishing process was much higher than the level conventionally considered. There was no way to polish rice without bringing it in. However, such a problem according to the present invention, in a rice polishing plant, grain size selection by a long hole slightly larger than a rice grain in a step prior to the rice milling machine, or photoelectric selection utilizing a difference in color or brightness It can be solved by taking a rice polishing method to remove feces. Then, in the large grain selection, specifically, in the sorting cylinder in which a large number of long holes for sorting having a short diameter slightly larger than the short diameter of the brown rice grain are opened on the peripheral surface of the cylindrical body, the sorting cylinder is rotated by the rotational force and the transfer resistance. While applying different pressing force in the long axis direction of, by transferring the raw brown rice in the long axis direction,
While the brown rice grains are allowed to flow out through the sorting long holes, the rat feces that are mixed in the raw brown rice and are slightly larger than the short diameter of the sorting long holes are discharged from the tip side in the transfer direction of the sorting cylinder. This is a rice polishing method in which the grain size selection is performed to separate the brown rice grain and the rat feces. Alternatively, a grain polishing method may be used in which grain-size selection is performed to separate brown rice grains in the raw brown rice from rat feces by using an oscillating sieve having a hole slightly larger than the rice grains. Furthermore, a photoelectric sorter that uses a background with a lower lightness than that for milled rice and has a longer ejector fume time than that for milled rice or a later fumarolic time is used to produce brown rice grains in raw brown rice and rat feces. Alternatively, a method of polishing rice for separating the and

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The method for polishing rice of the present invention is to perform grain size selection or photoelectric selection in a step before brown rice in a rice polishing plant, that is, before introducing brown rice into the rice polishing machine. . At this time, it is desirable to set the throughput of the selective removal to be equal to or more than the throughput of the rice polishing machine. Specifically, when brown rice is added after a means for removing rat dung has been provided in the previous process of the rice polishing machine,
It is advisable to have a configuration in which the flow from the removal of rat feces to the introduction into the rice polishing machine can be performed continuously.

First of all, as for the selection method using a selection tube, the raw brown rice is rotated in a selection tube in which a large number of long slots for selection having a short diameter slightly larger than the short diameter of brown rice grains are opened on the peripheral surface of the cylindrical body. Individual brown rice grains are transferred by applying different pressure forces in the long axis direction of the sorting cylinder depending on the force and transfer resistance, for example, while applying pressure force except in the vicinity of the tip opening of the sorting cylinder in the long axis direction of the sorting cylinder. Since it rotates while receiving a pressing force, the direction in which the long axis of the brown rice grain intersects the long axis direction of the sorting cylinder,
That is, the angle formed by the long axis of the brown rice grain and the long axis direction of the selection tube is likely to be nearly orthogonal. At that time, since the pressing force applied to the brown rice grains varies depending on the position of the sorting cylinder, each part in the transfer direction is
The pressurizing unit, the sending unit, and the foreign matter (mouse feces) discharging unit function respectively. In addition, since a long hole for sorting having a minor diameter slightly larger than the minor diameter of the brown rice grain is opened on the peripheral wall of the sorting cylinder, the brown rice grain is further combined with the pressing force and the rotational force to the raw brown rice. Combined with the roundness and relatively small friction coefficient, when the brown rice grain reaches the long slot for sorting opened on the peripheral wall of the sorting cylinder, it tends to come out from the long slot, that is, with respect to the long hole. It rotates in the direction of the shortest diameter (posture that matches the opening direction of the long hole) and continuously flows out of the selection cylinder from the long hole for selection. If the long axis of the selection long hole is opened in the direction intersecting the center line direction of the cylindrical body, the brown rice grains flow out more efficiently.

On the other hand, rat feces that are mixed in the raw brown rice and are slightly larger than the minor diameter of the above-mentioned long holes for sorting are transferred to the tip side of the sorting cylinder in the transfer direction without flowing out from the long holes for sorting, and are sorted. The foreign matter is discharged from the foreign matter discharge port provided on the front end side in the transfer direction of the cylinder. The reason why the rat feces do not flow out of the selection long hole is that the brown rice grains have a rounded shape and a relatively small coefficient of friction, as described above, and they tend to come out of the same long hole when approaching the selection long hole. Direction, i.e., in the direction of the shortest diameter with respect to the long hole, the feces of the rat have an irregular shape even if they are larger than the short diameter of the long hole for sorting, or about the same size. Also, since the surface is not rounded and has a relatively large coefficient of friction, it does not rotate like brown rice grains and cannot pass through the long holes for sorting. Therefore, the rat's feces to be removed that are mixed in the raw brown rice are removed from the tip of the sorting cylinder.
Also, the majority of brown rice grains are taken out from the peripheral wall surface of the sorting cylinder.

If the pressing force is eliminated in the vicinity of the tip in the transfer direction, the foreign matter is not pressed in the vicinity of the tip of the sorting cylinder in which almost only rat feces are present, and the rat feces are cracked. Nor.

Next, as for the oscillating sieve having elongated holes slightly larger than the rice grains, the oscillating sieve having a large number of elongated holes slightly larger than the rice grains is oscillated, and the raw brown rice is flown through this to produce brown rice grains. Leakage from a large number of long holes, and rat feces larger than the long holes are drawn to the end of the sieve and taken out through the foreign matter discharge port.

In photoelectric selection, the background of the photoelectric sorter is made to have a color or brightness similar to that of brown rice, so that the efficiency of foreign matter selection in brown rice is enhanced. Since it is slowing down, the following effects can be obtained. That is, since the rat feces are lighter than the rice grains and slightly larger than the rice grains, they are susceptible to air resistance, and the fall time from the position of the light receiving element to the position of the ejector, that is, the time lag is longer than that of the rice grains, the conventional polished rice is used. In the color sorter for use, the ejection of the ejector performed in an extremely short time does not match the timing, resulting in selection omission.However, in the photoelectric selection of the present invention, the ejection time of the ejector is long or the ejection timing is delayed. As a result, the rat's feces are removed as a result of the correct timing.

[0017]

Embodiments of the present invention will be described below. In any case, the present invention is characterized in that a sorting machine for removing rat feces is provided in a step prior to the rice milling machine in the rice polishing plant. A method of removing rat dung by grain size selection using a selection cylinder will be described.

[Embodiment 1] FIG. 1 schematically shows the overall structure of a sorting cylinder 1 used in the rice polishing method of the present invention. In the example shown in the figure, a long hole for sorting 3 having a minor diameter slightly larger than the minor diameter of the target brown rice grain, for example, a width of 2.3 mm and a length of 12 mm, is provided on the peripheral surface 5 of the cylinder. The opening is made in a direction intersecting with the center line direction of the cylinder (in this figure, 90 ° intersection is shown, but it may be inclined). Inside, a rotary shaft 9 provided with a blade plate 7 for imparting a rotational force to the raw brown rice in the sorting cylinder 1 is provided.
Both ends of the selection cylinder 1 are open.

Raw material brown rice is continuously fed into the sorting cylinder 1 from the opening end 11 on one end side, and the foreign matter discharge port 13 is opened by a mechanical pressure means (not shown) or a fluid such as air. Apply pressure in the direction. Further, when the rotating shaft 9 is rotated in this state, the transfer force of the sorting cylinder 1 toward the foreign matter discharge port 13 and the rotating force of the blade 7 simultaneously act on the fed raw rice. That is, as shown in FIG.
For example, on the raw brown rice in the vicinity of the rotary shaft 9 fed from the opening end 11 on one end side, a spiral trajectory shown by an arrow is drawn by the resultant force of the pressing force from the opening end 11 on one end side and the rotational force by the blade plate 7. Such a transfer force will be added. Then, by narrowing the passage in the proper position of the sorting cylinder 1 and providing the vane plates 7 at a plurality of locations in the longitudinal direction of the rotary shaft 9, and changing the mounting angle thereof, a resistance force that acts as a brake for the transfer of the raw brown rice is given. As a result, different pressures can be applied to the raw brown rice in the sorting cylinder 1. When such a pressing force is applied to the raw brown rice, the individual items to be sorted receive a pressing force while rotating in the sorting cylinder 1, and the brown rice grains are rounded and have a relatively small friction coefficient. When it reaches the elongated slot 3, the direction in which it easily rotates out of the elongated slot 3 opened in the sorting cylinder 1, that is, the brown rice grain has the size and shape described above, and the shortest radial direction has a width of 2 .3
It faces the sorting long hole 3 in a direction of passing through the sorting long hole 3 of mm, and continuously flows out of the sorting cylinder 1 from the sorting long hole 3. At this time, the positional relationship between the brown rice grains and the selection long holes 3 is as shown in FIG. 3, and the brown rice grains are oriented in the direction of the shortest diameter. In the standing state (posture A ₁ ), or in the state of lying (posture A ₂ ), in which the long axis direction of the long holes 3 for sorting of (b) and the long axis direction of the brown rice grains substantially coincide (posture A ₂ ). Either of them will continuously flow out from the long hole 3 for selection. In particular, in this embodiment, the long axis direction of the selection long hole 3 is opened in a direction substantially orthogonal to the center line direction of the selection cylinder 1 substantially along the rotation direction of the raw rice grain. Efficient outflow from 3.

On the other hand, the rat dung 4 mixed in the raw brown rice is transferred to the front end side in the transfer direction of the selection cylinder 1 without flowing out from the long hole 3 for selection, and is provided at the front end side in the transfer direction of the selection cylinder 1. The foreign matter is discharged to the outside through the foreign matter discharge port (opening end 13 on the other end side). The reason why the brown rice grains flow out from the sorting long hole 3 but the rat feces 4 do not flow out from the sorting long hole 3 is as shown in Fig. 3 (b). Is very small, that is, it has a major axis of about 5 mm, but even a major axis with a major axis of only about 2.2 mm flows out through the sorting long hole 3 having a width of 2.3 mm, while the rat feces 4 This is because it is slightly larger and does not flow out. However, in the rat's feces 4, the same size as brown rice grain,
In other words, there is no one that is close to the shape and size of brown rice grain. However, the rat feces 4 are not in the shape of smooth rounded rice grains, but are irregular and have a large coefficient of friction on the surface. When approaching, the rat feces 4 cannot rotate in the direction along the perforations of the selection long hole 3 and do not flow out from the long hole 3. Therefore, according to the rice polishing method of the present invention, the rat feces 4 to be removed are taken out from the tip of the sorting tube 1 and the majority of brown rice grains are taken out from the peripheral surface 5 of the sorting tube 1.

Next, an embodiment of a foreign matter sorting apparatus which can be connected to the input port of a rice polishing machine using the above-mentioned method for removing rat feces will be described. FIG. 4 shows the first embodiment of the foreign matter sorting apparatus as a schematic diagram. The illustrated example is a transfer means for transferring raw brown rice, which is provided on the outer circumference of the rotary shaft 9 at predetermined angles θ ₁ , θ ₂ , and θ with respect to the generatrix a of the rotary shaft 9.
A single or a plurality of screw-type transfer means 15 to which the vane plate 7 is attached at ₃ ; and brown rice grains on the peripheral surface of a cylindrical or polygonal cylinder fixedly arranged on the outer peripheral side of the screw-type transfer means 15. The long hole 3 for selection having a minor diameter slightly larger than the minor diameter of the same is opened in the direction in which the major axis thereof intersects the center line direction of the cylinder, and the screw type transfer means 1
Foreign matter discharge port (the other end side opening end 1
The foreign matter sorting device 17 is provided with a sorting cylinder 1 provided with 3). Here, the rotary shaft 9 of the screw type transfer means 15 has a hollow structure, and has a cantilever structure in which a drive rotary shaft 9a such as a motor shaft is fitted from one end side.
Further, at an appropriate position on one end side of the sorting cylinder 1, an input port 1 for the raw brown rice is provided.
9 are provided. The clearance between the sorting cylinder 1 and the blade 7 is basically desired to be 3 to 4 times the short diameter of the brown rice grain. That is, if this is too narrow, crushed particles will occur,
On the other hand, if it is too wide, the selection ability will not increase, and it is more preferable to determine an appropriate clearance on the basis of experiments.
The raw material brown rice is fed into the feeding portion A on the upstream side of the screw-type feeding means 15, the brown rice grain feeding portion B is placed onto the feeding downstream tip side, and the stirring portion C is placed between the feeding portion A and the feeding portion B. age,
The angle θ ₁ formed by the vane plate 7 and the generatrix a of the rotary shaft 9 in the feeding portion B is the largest, the angle θ ₂ in the stirring portion C is the smallest, and the angle θ in the feeding portion A is the same.
₃ is set between θ ₁ and θ ₂ . With such a configuration, the raw brown rice fed from the feeding unit A is transferred to the feeding unit B.
Since the mounting angle of the vane plate 7 is θ ₁ when it comes to the position, the transfer amount per unit time decreases, so transfer resistance works there, and from the tip of the feeding part A to the stirring part C. The pressing force is applied to the raw brown rice. Therefore, the brown rice grains flow out from the long holes 3 for sorting existing on the outer periphery by the action as described above. Due to such a structure and the above-mentioned action, most of the brown rice grains flow out from the elongated slot 3 for sorting before reaching the tip of the delivery section B.
No pressure is applied near the tip of the delivery section B, and only a small amount of the remaining feces of the mouse is transferred to the open end 13 on the other end side and discharged. At this time, no pressure is applied to the rat feces,
It is possible to prevent cracking of rat feces and scratches due to other foreign matter from occurring on the screw type moving means and the inner surface of the sorting cylinder.

The operation of the foreign matter sorting device 17 will be described in more detail. FIG. 5 shows the II cross section of the foreign matter sorting apparatus 17 shown in FIG. 4 as viewed from the other open end 13. Along with the rotation of the screw-type transfer means 15, the blade plate 7 provided on the outer periphery of the rotary shaft 9 rotates, and the rotation of the blade plate 7 causes the raw brown rice to move toward the other open end 13. At the same time, a rotational force is applied along the direction of the arrow in the figure. Then, the raw brown rice is transported to the position along the inner peripheral surface 21 of the sorting cylinder 1 by this rotational force, and as described in the above-mentioned sorting method, the posture shown in FIG. It efficiently flows out of the sorting cylinder 1. As shown in the following FIG. 6, the elongated slot 3 for selection may be appropriately designed depending on the type of the target brown rice grain, such as a rectangular shape of (a) or an arc shape of both ends of (b). The size of the long hole 3 for selection is slightly larger than that of the longest brown rice grain having the shortest diameter, and the length is 1.2% of that of the longest brown rice grain.
About 3 times is good. Further, in the case of brown rice grains, since the shape thereof is a substantially circular cross-sectional shape with a short diameter, the shape of (b) is preferable from the viewpoint of allowing smooth passage through the selection long holes 3.

Further, in the above-described present invention, it is better to consider the angle between the major axis direction of the sorting long hole 3 and the center line direction of the sorting cylinder 1. FIG. 7 shows the positional relationship between the selection long hole 3 and the center line direction 9c of the selection cylinder 1.
Here, the angle θ ₄ shown in the figure is treated as 90 degrees. This is because the brown rice grains rotate in the sorting cylinder 1 due to the action of the present invention, and thus are opened along the direction. However, since the raw brown rice moves in the transfer direction while rotating, it may be better to make it at an angle of about 70 ° instead of fixedly considering the angle θ ₄ as 90 °.

FIG. 8 shows major and minor diameters of brown rice varieties, and major and minor diameters of the sorting long holes 3 adapted to them. As shown in the figure, the major axis and minor axis of the sorting long hole 3 may be set depending on the size of the brown rice grain. Further, as is clear from this figure, in the case of brown rice grains, the minor axis cross-sectional shape is substantially elliptical, so the minor axis of the selection long hole 3 is naturally longer than the elliptical major axis of this minor axis cross section. You need to do it.

Further, a transfer resistance means is provided at a proper position in the transfer direction, and a transfer upstream side of the transfer resistance means is a pressurizing section for the raw brown rice, and a transfer downstream side of the transfer resistance means is a pressure release section. You can also The transfer resistance means resists the flow of the raw material brown rice transferred at a proper position of the sorting cylinder 1, and transfers it to the open end 13 on the other end side without applying a pressing force downstream thereof. It is what By doing so, the brown rice grains slightly remaining before reaching the opening end 13 on the other end side flow out from the long holes 3 for sorting, and only the remaining feces of the mouse are discharged.

As the transfer resistance means, although not shown, a screw type transfer means is constituted by at least the transfer means of the feeding part and the transfer means of the sending part rotating at a speed lower than that, and this low speed rotating screw is used as the transfer resistance. It can be realized by doing.

As another transfer resistance means, as shown in FIG. 9, a disk-shaped plate member 16 may be provided at a proper position in the transfer direction of the screw type transfer means 15. This plate-shaped member 16 is a bus bar a of the rotary shaft 9 of the screw type transfer means 15.
Since the plate-shaped member 16 is rotated, the transfer force does not act on the raw brown rice. Moreover, the transfer passage of the raw brown rice in the sorting cylinder 1 is a disc-shaped plate-shaped member 1.
Since there is only a slight gap between 6 and the sorting cylinder 1, the plate-shaped member 1
An effective pressing force is applied on the upstream side of 6, while the pressing force is completely released on the downstream side. Then, only a few brown rice grains and rat feces are pushed to the downstream side of the plate member 16 from the gap between the plate-shaped member 16 and the sorting cylinder 1, and the remaining brown rice grains are left for the sorting length. Only the feces of the mouse are discharged from the hole 3 and are transferred to the open end 13 on the other end side and discharged without applying a pressing force.

FIG. 10 shows another transfer preventing means.
As shown in, the screw type transfer means 15 is inserted and fixed at a proper position on the inner peripheral surface of the selection cylinder 1 in a positional relationship.
You may provide the conical member 18 which made the opening diameter of the downstream of the transfer direction narrower than the opening diameter of the upstream of the transfer direction. As is clear from the figure, the conical member 18 functions as a baffle plate for the raw brown rice, so that the transfer thereof is stopped and it is possible to contribute to the effective application of a pressing force. As described above, the effective pressure is applied on the upstream side of the conical member 18, while the pressure is completely released on the downstream side. Then, the rat feces and a few brown rice grains are pushed to the downstream side of the cone member 18 from the gap between the conical member 18 and the rotating shaft 9, and then the brown rice grains are sorted without applying a pressing force. The rat feces discharged from the long hole 3 and finally left are transferred to the other end side open end 13 and discharged. The transfer resistance means described above is merely an example, and other known resistance means may be used.

Next, another embodiment of the foreign matter sorting apparatus 17 of the present invention will be described in detail with reference to the drawings. In FIG.
The 2nd Example of the foreign material selection apparatus 17 of this invention is represented typically. The illustrated example is a transfer means for transferring raw brown rice, and the blade plate 7 is attached to the outer periphery of the rotary shaft 9 at predetermined angles θ ₁ , θ ₂ , and θ ₃ with respect to the generatrix a of the rotary shaft 9. A single or a plurality of screw-type transfer means 15; a long hole 3 for sorting, which is arranged on the outer peripheral side of the screw-type transfer means 15 and has a minor axis slightly larger than the minor axis of brown rice grains on the circumferential surface of the cylinder. The screw-type transfer means 1 is provided so as to be opened so that its major axis does not intersect the center line direction of the cylinder.
Foreign matter discharge port (the other end side opening end 1
The foreign matter sorting device 17 is provided with a sorting cylinder 1 provided with 3). Here, the rotary shaft 9 of the screw type transfer means 15 has a hollow structure, and has a cantilever structure in which a rotary shaft 9a for driving is fitted into one end side. A pulley 23 is attached to the rotating shaft 9a, and is connected to a rotation driving means such as a motor (not shown) via a belt 25. Further, an input port 19 for the raw brown rice is provided at a proper position on one end side of the sorting cylinder 1. Further, the sorting cylinder 1 is attached to the casing 27, and the inside of the casing 27 serves as a flow path for brown rice grains flowing out from the entire outer peripheral portion of the sorting barrel 1 and is connected to an outlet 29 provided at the bottom of the casing 27. . Here, in order to explain the structure in an easy-to-understand manner, the opening density of the selection long holes 3 is roughly drawn in this figure for convenience. That is, it is natural that the minor axis of the selection long holes 3 is at least smaller than the pitch between the blade plates 7.

When the feed part of the raw brown rice on the upstream side of the upstream side of the screw type transfer means 15 is A, the interval from the tip to the delivery part B is a pressurizing part, and the delivery part is The angle θ ₁ formed by the vane plate 7 in B and the generatrix a of the rotary shaft 9 is set to be the largest, and the angle θ ₃ in the feeding portion A is set to be small. With such a configuration, the raw brown rice fed from the feeding part A is resisted by the action of the small feeding amount of the feeding part B, and the raw brown rice existing up to that point is fed from the feeding part A. As a result of the pressing force being applied by the thrust associated with the transfer of the liquid, the liquid is forcedly flown out from the sorting elongated hole 3. Further, since the screw pitch in the feeding section B is the smallest in the vicinity of the stirring section C, most of the brown rice grains flow out from the elongated slot 3 for sorting before reaching the tip of the feeding section B, and The pressure becomes smaller as it approaches the tip of B, and only a small amount of the remaining feces of the mouse is transferred to the open end 13 on the other end side.
At this time, most of the unpolished rice grains are not already present inside the sorting tube 1.

Although the duplicate description is omitted, the first example is also used in this example.
Of course, as in the embodiment, it is effective to combine the above-described transfer resistance means.

[Embodiment 2] Next, a method of performing grain size selection using an oscillating sieve will be described. In this method, FIG.
As shown in Fig. 4, the sieve is a sieve that horizontally or slightly tilts and swings, and has a width of 2.3 to slightly larger than brown rice grains.
It is performed using a flat sieving plate 31 having a large number of long holes 30 having a length of 3 mm and a length of 6 to 20 mm. Then, when the raw brown rice is supplied to the appropriate place of the sieving plate 31, the brown rice grains drop downward from the long holes 30 and move toward the non-defective product outlet (not shown), while the rat feces are the same as in the case of Example 1. Therefore, it cannot be dropped from the long hole 30 of the sieving plate 31, is moved to one corner of the sieving plate 31, and is removed from the foreign matter discharge port (not shown).

[Embodiment 3] Next, an embodiment of removing rat feces by photoelectric sorting will be described. Here, a photoelectric sorting machine used therefor will be described. FIG. 13 shows the structure of the photoelectric sorter used in the rice polishing method of the present invention, which is almost the same as the known color sorter. The structure will be briefly described below. In the illustrated example, a photoelectric sorting chamber 33 is arranged below the slope 32, and further below this photoelectric sorting chamber 33, there is a sorting grain discharge port 34 through which normal brown rice grains fall, and on the side thereof, a mouse. The different-colored grain discharge ports 35 through which the feces of the above are discharged are respectively arranged. Then, on both sides of the photoelectric selection chamber 33, a background 36, a sorting light source 37, and a photoelectric chamber 39 accommodating the light receiving element 38 are provided. In addition, an ejector 41 for blowing off rat feces, that is, different-colored grains to the different-colored grain discharge port 35 is provided above the sorted-grain discharge port 34. As described above, such a photoelectric sorter has substantially the same basic structure as the conventionally known device, but the difference is that the background 36 is a dark color which is almost the same color as brown rice grains, or brown rice. It has almost the same brightness as the grain (by taking measures such as darkening the light source provided inside the background), and in any case, the background is darker than that for conventional polished rice, and brown rice The lightness of the grain is almost the same as that of the grain, and the time from when the light receiving element 38 receives a different color grain signal based on the rat feces until the ejector 41 blows off when the burnt rice in the polished rice is removed. It is slightly longer than the setting, or the ejector 4 is triggered by the different color grain signal.
The reason for this is that the time from the start of the fuming of No. 1 to the end of the fuming is set slightly longer than that at the time of removing the burned rice. As a result, when the rat droppings mixed in the brown rice grains fall from the slope 32 while maintaining a slight interval between the grains, a change in the light amount due to the black rat droppings different from the brightness of the background 36 occurs. The ejector 41 blows out instantaneously according to the signal of the light receiving element 38 which receives it, but the timing is later than that of the conventional one, or the time from the start to the end of the blowout is longer than before. Therefore, the following phenomenon occurs. In other words, since rat dung is slightly larger than brown rice grains and slightly lighter, it takes longer to drop than burned rice due to the effect of air resistance. Although it causes omission of selection, in the present invention, the fuming timing is delayed as described above, or the fuming time itself from the beginning to the end of the fuming is set to be long, so that dropping of rat feces and tamping of fumes occur. They are matched, and are reliably blown off by the fumes to be selectively removed.

[0034]

As described above, by removing the rat feces mixed in brown rice by the rice polishing method of the present invention, specifically, the rice polishing method using the apparatus described in each of the above examples, No more bringing in rat dung in the subsequent rice polishing process. As a result, it is no longer necessary to supply the consumer with milled rice coated with rat dung, which is a conventional food product. Further, in the method of Example 1, when the raw brown rice is transferred in the sorting cylinder while applying different pressures in the longitudinal direction of the sorting cylinder due to the rotational force and the transfer resistance, the individual brown rice grains are pushed to the delivery section. As a result of receiving pressure, brown rice grains can be efficiently discharged from a narrow selection long hole with a large unit time throughput,
Since high-precision sorting and removal can be performed with the same processing capacity as that of seisei, adding a new process before seisei does not have a negative effect on work efficiency. Further, since the foreign matter removing device can perform stable sorting and discharge only foreign matter such as rat feces from the tip of the sorting cylinder, extremely high precision sorting work can be performed. Therefore, in this method, when brown rice is fed with a foreign matter sorting device using the above-mentioned sorting cylinder provided near the loading port of the rice milling machine that performs milling, the flow from the removal of rat dung to the loading into the rice milling machine is continuous. It is possible to realize a rice polishing method that can be performed in a specific manner. In addition, the methods of Examples 2 and 3 can also remove the rat dung before entering the rice milling machine as in the above, and can supply the consumer with milled rice coated with the rat dung. Lost. As described above, according to the rice polishing method of the present invention, the sanitary quality of the polished rice as a food can be significantly improved, and the image can be improved.

[Brief description of drawings]

FIG. 1 is an explanatory view showing the overall structure of a sorting cylinder used in Embodiment 1 of the present invention.

FIG. 2 is an explanatory view schematically showing the transfer force received by the raw material brown rice.

FIG. 3 is an explanatory view showing the positional relationship between the sorting long holes and the brown rice grains in the vicinity of the inner peripheral wall surface of the sorting cylinder.

FIG. 4 is an explanatory diagram showing a first embodiment of a foreign matter sorting apparatus that can be used in the rice polishing method of the present invention.

FIG. 5 is an explanatory view showing a cross section of the foreign matter sorting apparatus shown in FIG.

FIG. 6 shows the shape of the same long hole for sorting, (a) having a rectangular shape, and (b) having arcuate ends.

FIG. 7 is an explanatory view showing a positional relationship between the long slot for sorting, the sorting cylinder, and the center of the rotation axis of the screw type transfer means.

FIG. 8 is an explanatory view showing major and minor diameters of the same brown rice grain varieties, and major and minor diameters of sorting long holes adapted to each.

FIG. 9 is an explanatory view showing an embodiment of the transfer resistance means.

FIG. 10 is an explanatory view showing an example of a mounting structure of the transfer resistance means.

FIG. 11 is an explanatory diagram showing a second embodiment of a foreign matter sorting apparatus that can be used in the rice polishing method of the present invention.

FIG. 12 is an explanatory diagram showing an example of a sieving plate that can be used in Example 2 of the present invention.

FIG. 13 is an explanatory view of main parts showing an example of a photoelectric sorter that can be used in Embodiment 3 of the present invention.

FIG. 14 is an explanatory diagram showing the structure of a conventional foreign matter sorting apparatus.

FIG. 15 is an explanatory diagram showing a conventional mesh screen.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sorting cylinder 3 Long hole for sorting 4 Rod feces 5 Longitudinal wall surface 7 Blade plate 9 Rotating shaft 9a Rotating shaft for driving 11 One end side opening end 13 The other end side opening end 15 Screw type transfer means 16 Plate member 17 Foreign matter sorting device 18 Conical member 19 Input port 21 Inner peripheral surface of sorting cylinder 23 Pulley 25 Belt 27 Housing 29 Discharge port 30 Long hole 31 Sieve plate 32 Sloping path 33 Photoelectric sorting chamber 34 Sorted grain discharge port 35 Different color grain discharge port 36 Background 37 Light source for sorting 38 Light receiving element 39 Photoelectric chamber 41 Ejector 50 Conventional foreign matter sorting device 52 Small hole 54 Sorting cylinder 56 Screw blade 58 Stirring blade 60 Input port 62 Discharge port 64 Mesh 66 Opening part

Claims (4)

[Claims] 1. In a rice polishing plant, in a step prior to the rice polishing machine, grain-size selection by a long hole slightly larger than a rice grain, or photoelectric selection utilizing a difference in color or brightness, Rice polishing method to remove feces. 2. A long axis direction of the selection tube due to rotational force and transfer resistance in a selection tube in which a large number of selection slots having a short diameter slightly larger than the short diameter of brown rice grain are opened on the peripheral surface of the cylindrical body. While applying different pressurizing force with, the raw rice grains are transferred in the long axis direction so that the brown rice grains flow out from the long holes for sorting, while the raw rice grains have a shorter diameter than the short holes of the long holes for sorting mixed in the raw rice grains. The rice polishing method according to claim 1, wherein grain-size selection is performed to separate brown rice grains in the raw brown rice from the rat dung by discharging slightly large rat dung from the front end side in the transport direction of the sorting cylinder. 3. The method for polishing rice according to claim 1, wherein grain-size selection for separating the brown rice grains in the raw brown rice from the rat feces is carried out by an oscillating sieve having a hole slightly larger than the rice grains. 4. A brown rice grain in raw brown rice is obtained by a photoelectric sorter which uses a background of lower brightness than that for milled rice, and which has a longer ejector fusing time or a later fusing time than that for milled rice. The rice polishing method according to claim 1, wherein the rice feces are separated from each other.