JPH0966264A - Method for selecting foreign matter in rice grain group - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively select and remove foreign matters larger than rice grains in a rice grain group by rotating a selection cylinder with a slit of width slightly larger than the short diameter of the rice grain. SOLUTION: While a selection cylinder 3 is rotated, a rice grain group 13 in which foreign matters are mixed is fed from a hopper 11. Then the rice grain group 13 comes across a new slit 1 moved following the rotation. As the width of the slit 1 is set larger than the short diameter of a rice gain, the rice grains 23 are passed through the slit 1 and flowed down to a pick-up line 15 of rice grains. On the other hand, the foreign matters such as rat feces slightly larger than the rice grains 23 are transferred to the other end side by the inclination of the selection cylinder 3 and flowed from an opening 17 on the other end toward a discharge outlet 19 for the foreign matters. As the fine and long foreign matters such as hairs are in the rotating or floating state or in the state of entangling with other foreign matters 25, such foreign matters are picked up from the discharge outlet 19 without slipping off the slit 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foreign matter selection technique capable of efficiently selecting and removing foreign matter larger than rice grains present in rice grain groups such as brown rice and polished rice.

[0002]

2. Description of the Related Art Among the foreign substances mixed in rice grains such as brown rice and polished rice, mouse feces are attracting attention as a foreign substance larger than rice grains. Then, in order to surely remove the rat feces, the applicant has already proposed the effectiveness of removing the rat feces from the unpolished rice before introducing it into the rice polishing process. Here, the size and shape of the brown rice grains are 5 to 5.
5 mm x 2.9 to 3 mm x 1.7 to 2.3 mm is a flat shape, whereas the size and shape of rat feces is about 1
It has a spindle shape or a sausage shape of 5 to 20 mm × 3 to 4 mm, and is known to be slightly larger than brown rice grains. Examples of other foreign substances include bran balls that are generated during rice polishing and fragments of bags when storing brown rice. Among the bran balls, the bran removed during rice polishing aggregates and grows, and is produced as foreign matter larger than rice grains. In addition, the bag fragments were temporarily removed by the roughing machine before being put into the rice-polishing process, but a small amount was inevitably mixed in a small amount, and the bag fragments mixed in were smashed in the rice-polishing machine. By receiving the fluff, the size becomes larger than that of the rice grain. Then, as a method for removing the foreign matter larger than the rice grain, a known coarse selecting machine based on the principle of the sieve for a foreign matter significantly larger than the rice grain, or a mesh as shown in FIG. Some use a sieve. It is not necessary to explain these again, but a group of rice grains mixed with foreign matter is put in from the top of a mesh-like sieve, and foreign matter larger than the rice grain is left on the sieve, and only rice grains pass through the sieve mesh. It is what makes me. There is also a method of discharging and removing foreign matter smaller than rice grains from the peripheral surface of a rotating cylindrical sieve.

[0003]

However, when such a mesh screen is used, the opening diagonal length x of the mesh 40 is set to be slightly longer than the major axis of the rice grain, as shown in the figure. However, when the diagonal length x of the opening is set in this way, the opening 42 becomes large, so that only a considerably large foreign matter can be removed. Moreover, the opening 4
The rice grain cannot pass through the mesh unless the rice grain is inclined with respect to 2, resulting in a significant decrease in processing capacity. Therefore, since the mesh 40 can pass through regardless of the direction of the rice grain with respect to the opening 42, the mesh 40
The opening side length y of the mesh 40 is set to be slightly longer than the major axis of the rice grain.
2 becomes even larger, and only extremely large foreign matter can be removed. And, of course, this cannot completely remove foreign substances, such as rat dung, which are slightly larger than rice grains. Further, the above method of discharging and removing foreign matter from the peripheral surface of the cylindrical sieve is to discharge a small amount of foreign matter or small grain rice mixed in a large amount of rice grains from the peripheral surface of the cylindrical sieve. , Foreign substances larger than rice grains cannot be removed. In this sorting method, only a small amount of small grains of rice or a small foreign substance contained in a large amount of rice grains are allowed to flow out from the Amami eyes, and not a system in which a large amount of rice grains themselves are discharged from the Amami eyes.

[0004]

The present invention has a processing capacity equal to or higher than the processing capacity of the rice polishing process, and efficiently and efficiently removes foreign substances slightly larger than rice grains typified by rat feces. It is an object of the present invention to provide a method for selecting foreign substances in a rice grain group that can be reliably removed. According to the present invention as described above, a sorting cylinder having a large number of elongated holes having a width slightly larger than the short diameter of the rice grain is opened on the peripheral surface of the sorting cylinder, and foreign matter is mixed in from the opening at one end. This can be realized by a method for selecting foreign matter in a rice grain group, in which the rice grain group is charged to flow out the rice grain from the elongated hole and a foreign matter larger than the rice grain is taken out from the opening at the other end. This foreign matter selection method is
In the process prior to the rice milling machine in the rice polishing plant, rotate both ends of the sorting cylinder in an inclined state, opening both ends and forming a number of elongated holes with a width slightly larger than the short diameter of the rice grain, and tilt upward. A rice grain group in which foreign matter is mixed is introduced from the opening at one end located to allow the rice grain to flow out from the slot, and a foreign matter larger than the rice grain is extracted from the opening at the other end located below the slope. A method of selecting foreign matter in the rice grain group to be taken out may be used, and in this case, the foreign matter is rat feces. Further, between the rice milling machine and the packaging machine in the rice milling plant, the both ends are opened and the sorting cylinder in which a number of elongated holes having a width slightly larger than the short diameter of the rice grain is formed on the peripheral surface is rotated in an inclined state, While introducing a rice grain group in which foreign matter is mixed from the opening at one end located on the upper side of the slope to cause the rice grain to flow out from the elongated hole, a foreign matter larger than the rice grain,
It may be a foreign matter selection method in the rice grain group taken out from the opening at the other end located below the slope, and the selection target in this case is a foreign matter larger than the rice grain produced between the rice polishing machine and the packaging machine. Good to do. Further, in these foreign matter selecting methods, elongated holes are provided in a direction orthogonal to the longitudinal direction of the selecting cylinder, and between the elongated holes along the longitudinal direction, an approximately V is projected toward the inside of the selecting cylinder. You may use the sorting cylinder in which the character-shaped standing wall was provided.

As described above, conventionally, a small amount of foreign matter is discharged from a large amount of rice grains from the peripheral surface of the cylinder, whereas the present invention discharges a large amount of rice grains from the peripheral surface of the cylinder. In this respect, the idea of removing foreign matter is completely different.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention can be carried out by utilizing, for example, a selection cylinder in which a large number of long holes are formed in the peripheral surface of an octagonal cylinder in a direction orthogonal to the longitudinal direction of the cylinder. Specifically, one end of this sorting cylinder is used as a rice grain group input port, and the input port is rotated in a tilted state such that the input port is slightly higher,
The rice grain group is introduced from the inlet. Then, the rice grains tend to be conveyed upward along the inner peripheral surface of the sorting cylinder as the sorting cylinder rotates, but eventually they fall down like an avalanche due to gravity and encounter a new long hole. Become. Here, since the long hole is set to have a width slightly larger than the short diameter of the rice grain, it quickly passes through the long hole and flows out of the sorting cylinder. Due to such a rotation operation of the sorting cylinder, the long holes successively pass through the lower part of the introduced rice grain group, and a large amount of rice grains flow out of the sorting cylinder in an extremely short time.
At this time, if a substantially V-shaped standing wall that projects inwardly of the sorting cylinder is provided between the long holes along the longitudinal direction, the rice grains can be quickly elongated along the side wall of the standing wall. It reaches the department and the processing capacity is further improved. On the other hand, foreign substances that are slightly larger than rice grains such as rat feces and relatively large foreign substances such as bran balls and bag fragments stay inside the sorting cylinder and move toward the other end due to the inclination of the sorting cylinder. And is taken out from the opening on the other end side. As described above, the sorting cylinder used in the present invention effectively increases the passing area per unit time through the long holes of the rice grain group by rotating, thereby improving the processing capacity. Therefore, even if the foreign matter selection method of the present invention is performed before the introduction into the rice polishing process or between the rice polishing machine and the packaging machine, the processing capacity does not decrease, and it should be further synchronized with the processing capacity of the rice polishing process. In this case, the negative side of the processing capacity due to the addition of the new sorting process will not occur. As described above, according to the present invention, the removal of rat feces at the stage of brown rice, and the removal of debris of bran balls, bags, etc., which is proposed by the applicant, reduces the processing capacity of the conventional rice polishing process. Can be realized without And because it uses a sorting cylinder,
Space saving can also be realized.

[0007]

EXAMPLES Next, the details of the present invention will be described based on specific examples. FIG. 1 shows an example of the configuration of a sorting apparatus for implementing the foreign matter sorting method of the present invention. In the example shown in the figure, a sorting cylinder 3 having both ends opened and a large number of elongated holes 1 having a width slightly larger than the short diameter of rice grain on the peripheral surface can be rotated in a tilted state in a housing 7 by a shaft 5. The structure supported by. A rotation driving means such as a motor (not shown) is connected to the shaft 5 to apply a rotational force to the selection cylinder 3. Sorting cylinder 3
At the position facing the opening 9 at one end located above the inclination of
A hopper 11 for introducing the rice grain group is provided, and the rice grain group 13 is introduced from the hopper 11 into the sorting cylinder 3. Below the peripheral surface of the sorting cylinder 3, the rice grain take-out path 1
5 is formed, and on the other hand, the opening 17 at the other end located below the slope continues to the foreign matter discharge port 19.
A jammer plate 21 is provided between the foreign matter discharge port 19 and the rice grain takeout path 15 so as to prevent the foreign matter and the rice grain from being mixed with each other.

Removal of foreign matter by such a foreign matter sorting apparatus is as follows. The sorting cylinder 3 is rotated, and the rice grain group 13 in which foreign matter is mixed is introduced from the hopper 11.
Then, the rice grain group 13 tends to be conveyed upward along the inner peripheral surface of the sorting cylinder 3 as the sorting cylinder 3 rotates, but eventually it falls down like an avalanche due to gravity, and along with the rotation. You will meet a new long hole 1 that is moving. Since the long hole 1 is set to have a width slightly larger than the short diameter of the rice grain, the rice grain 23 immediately passes through the long hole 1 and flows out from the peripheral surface of the sorting cylinder 3 to the outside. It flows down to the take-out path 15. On the other hand, the foreign substance 25 slightly larger than the rice grain 23 such as rat feces, or the foreign substance 25 relatively larger than the rice grain 23 such as bran balls and bag fragments,
Since it cannot pass through the long hole 1 because it is larger than the above, it is sent to the other end side due to the inclination of the sorting cylinder 3 while remaining inside the sorting cylinder 3, and the foreign matter discharge port 19 from the opening 17 at the other end.
It flows down to and is taken out.

It should be noted that even thin and long foreign matter such as hair, which has been extremely difficult to be selectively removed by the past, will pass through the meshes of the sieve like the conventional mesh sieve. It is a point that can be removed without selection. That is, the conventional mesh sieve is to pass the rice grains on the sieve and leave the foreign matter on the sieve, but when selecting only the rice grains from the rice grain group in which hair is mixed, the hair is sieved. Since it stays at almost the same position above, it will pass through the eyes of the sieve while being entangled with the rice grains, and it is difficult to select and remove only the hair. On the other hand, in the method of the present invention, since the rice grain group 13 is rotating in the cylindrical sorting cylinder 3, when the rice grain group 13 slides down in the sorting cylinder 3 in an avalanche shape due to this rotation. Since the hair is light, the sliding is delayed, and the hair is buried in the rice grain group 13 that slides down by the time the slide point is reached.
There is no contact with the inner wall of the. Therefore, the hair has a long hole 1
I have almost no chance to meet him, and of course I do not pass through the long hole 1. On the other hand, in the vicinity of the opening 17, the rice grain group 13 hardly remains in the sorting cylinder 3, and the foreign matter 25 is in a state of repeatedly sliding down from the inner peripheral surface thereof as the sorting cylinder 3 rotates. , The hair is very light and easy to float,
As the sorting cylinder 3 rotates, it floats or floats, or is entangled with other foreign matter 25.
It will be taken out from the discharge port 19 without falling off from the long hole 1. That is, according to the method of the present invention, unlike a conventional mesh sieve, by applying a floating force and a rotational force due to the rotation of the sorting cylinder 3 to a foreign substance that is long and thin and easily floats, such as hair, the foreign substance is lengthened. It is possible to obtain a peculiar function and effect of preventing the rice grains 23 from falling out of the hole 1.

As an example of the foreign matter sorting method of the present invention using the above sorting apparatus, for example, in the case of removing rat feces in brown rice grains, the rice grain removing device 15 is connected to the rice grain removing path 15 at a subsequent stage. , Connect to the input port of the rice polishing equipment. Then, the size, the number of rotations, the inclination angle, and the shape of the slot 1 of the sorting cylinder 3 are set so that the flow rate of the brown rice grains (rice grains 23) flowing down from the sorting cylinder 3 is almost equal to the throughput of the rice polishing apparatus. , Determine the size. In the sorting method of the present invention, since the rice grains 23 are allowed to flow down from the peripheral surface of the sorting cylinder 3 having a large area, the passing area per unit time of the rice grain group 13 to the slot 1 is effectively increased, and the rice polishing process The foreign matter 25 can be selectively removed with an ability equal to or higher than the processing amount. Therefore, even if the foreign matter 25 such as rat feces is removed at the stage of brown rice, the processing capacity as a whole does not decrease. Needless to say, even if the foreign matter 25 such as bran balls or broken pieces of bags is removed at any stage before the packaging machine, the processing capacity does not decrease.

An example of the sorting cylinder 3 that can be used in the foreign matter sorting method of the present invention is shown in FIG. In the example shown in the drawing, the width is slightly larger than the minor axis of the rice grain 23 on almost the entire surface of each of the eight surfaces 29 of the octagonal tube 27 with both ends open, and in the direction orthogonal to the longitudinal direction of the selection tube 3. A large number of elongated holes 1 are formed. The manner of forming the elongated hole 1 is shown in FIG.
The structure is as shown in FIG. As shown in FIG. 3, as a representative foreign substance to which the present invention is applied, when the purpose is to remove rat feces in brown rice grains, the slot 1 has a width d of 2.
The length L is set to 3 mm to 3.0 mm and about 30 mm. And, rice grains 23 such as brown rice usually have a length of about 5
mm, the width is about 3 mm, and the thickness is 2.2 mm or less, so that the longitudinal direction is along the long hole 1 and the width direction of the long hole 1 and the shortest radial direction of the rice grain 23 match. Passes through the long hole 1 and flows down to the outside of the sorting cylinder 3. Therefore,
Any foreign matter having a size of 2.3 mm or more cannot pass through the elongated hole 1, so that any foreign matter having a size larger than this size will be removed. Further, as shown in FIG. 4, the cross-sectional structure of the elongated holes 1 in the width direction (A-A cross section in FIG. 3) is directed between the elongated holes 1 along the longitudinal direction thereof and toward the inside of the selection tube 3. The structure is such that an overhanging substantially V-shaped standing wall 31 is provided. Therefore, along the side wall portion 33 of the standing wall 31, the rice grain 23 quickly reaches the elongated hole 1 portion while the posture is controlled so that the longitudinal direction of the rice grain 23 and the opening direction of the elongated hole 1 coincide with each other. Leads to improvement of. The width of this long hole 1 can be applied as it is to the removal of foreign matters such as bran beads and bag fragments, but in this case, unlike rice dung, rice grain 2
Since it is relatively larger than 3, the size can be set larger than the above size in order to increase the processing capacity. Of course, the size of the elongated hole 1 may be set appropriately according to the type of foreign matter to be removed.

In this example, the selection cylinder 3 has an octagonal cross section, but other polygons may be used. When the sorting cylinder 3 is polygonal in this way, the "fold" between the polygonal surfaces 29 when the sorting cylinder 3 is rotated serves as a weir when the rice grains try to slide like an avalanche. As a matter of fact, when the arbitrary surface 29 on which the rice grain groups are accumulated at the lowermost portion increases its inclination angle with the rotation of the selection cylinder 3, the accumulated rice grain groups are compared to the case of the cylinder. Can be transported to a higher position. With such an action, the “new slot group” with a small amount of accumulated rice grain groups moving to the vicinity of the lowermost portion of the sorting cylinder 3 with rotation is more forcefully driven from a higher position. Since the rice grain group slides down, it becomes easy and fast for the rice grain to fit into the portion where the long holes 1 are formed between the standing walls 31. In the case of the octagonal shape of this example, this “sliding down of the rice grain group with high vigor” occurs eight times during one rotation of the sorting cylinder 3. Therefore, it can contribute to the improvement of the processing capacity. Such a configuration is effective because the present invention is a method of flowing a large amount of rice grains down from the peripheral surface of the selection cylinder 3 in a short time. Since such a phenomenon becomes closer to a cylinder as the number of polygons increases, a hexagon to a decagon, preferably an octagon as in this example, is desirable.

[0013]

As described above, according to the foreign matter selection method of the present invention, the foreign matter larger than the shortest diameter of the rice grain can be reliably and promptly treated without significantly lowering the treatment capacity as compared with the rice polishing process. Can be removed. That is, the foreign matter sorting method of the present invention, in which a large number of elongated holes having a width slightly larger than the shortest diameter of rice grains are provided on the peripheral surface, the rice grains are discharged from the elongated holes on the peripheral surface of the rotating sorting cylinder. Therefore, it is possible to remove even a relatively small foreign matter, and effectively increase the passage area per unit time through the long holes of the rice grain group, thereby significantly improving the foreign matter selection processing capability. Therefore, for example, even if a step according to the foreign matter selection method of the present invention is provided before the rice polishing step for the purpose of removing rat feces from the brown rice grain group, it does not result in a decrease in the processing capacity as a whole, and the rice polishing step If it is synchronized with the processing capacity of, the negative side of the processing capacity due to the addition of a new sorting step will not occur at all. In addition, foreign substances such as bran balls and bag fragments that are generated in the rice milling machine or in the subsequent steps and increase in volume are removed by the foreign matter sorting method of the present invention between the rice milling machine and the packaging machine. In addition, if it is synchronized with the processing capacity of the rice polishing step as described above, no negative side of the processing capacity due to the addition of a new sorting step will occur. And the slot is set to a width slightly larger than the shortest diameter of rice grain, and because it is a rotation method, not only foreign matter obviously larger than rice grain but also smaller than rice grain like hair. Light foreign matter can be removed. As described above, almost no pressure is applied to the foreign matter in the sorting cylinder, and the foreign matter in the sorting cylinder moves in the tilting direction while maintaining the rotation or floating state. This is because it can be discharged from the lower end of the slope without being further discharged. Further, since the selection cylinder is used, space saving can be realized, and further, by making the selection cylinder polygonal, further improvement in efficiency can be realized.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a structural example of a foreign matter sorting apparatus used in the present invention.

FIG. 2 is an explanatory view showing a structural example of a sorting cylinder used in the present invention.

FIG. 3 is an explanatory view showing a mode of forming an elongated hole of a sorting cylinder used in the present invention.

FIG. 4 is an explanatory cross-sectional view showing a mode of forming a long hole of a sorting cylinder used in the present invention.

FIG. 5 is an explanatory diagram showing an opening of a mesh screen that has been conventionally used.

[Explanation of symbols]

 1 slot 3 selection cylinder 5 shaft 7 housing 9 opening at one end 11 hopper 13 rice grain group 15 rice grain take-out path 17 opening at the other end 19 foreign matter discharge port 21 rice grain plate 23 rice grain 25 foreign matter 27 octagonal cylinder 29 Eight faces 31 Standing wall 33 Side wall 40 Mesh 42 Opening

Claims (6)

[Claims] 1. A rice grain in which foreign matter is mixed from an opening at one end by rotating a sorting cylinder having a large number of elongated holes having a width slightly larger than the short diameter of the rice grain on the peripheral surface and having both ends opened. A method for selecting foreign matter in a rice grain group, in which a grain is thrown in to flow out the rice grain from the slot and a foreign matter larger than the rice grain is taken out from the opening at the other end. 2. In a step prior to the rice milling machine in a rice milling plant, a sorting cylinder, which is open at both ends and has a large number of long holes having a width slightly larger than the short diameter of the rice grain, is rotated in an inclined state. Then, the rice grain group in which foreign substances are mixed is introduced from the opening at one end located on the upper side of the slope to allow the rice grains to flow out from the long hole, and the foreign substances larger than the rice grains are located on the lower side of the slope. The method for selecting foreign matter in a rice grain group according to claim 1, wherein the foreign matter is taken out through an opening at the end. 3. The method for selecting foreign matter in a rice grain group according to claim 1, wherein the foreign matter is mouse feces as the foreign matter. 4. A sorting cylinder between a rice milling machine and a packaging machine in a rice milling plant, in which both ends are opened and a large number of long holes having a width slightly larger than the short diameter of the rice grain are formed on the peripheral surface in an inclined state. Rotate and put in a group of rice grains mixed with foreign matter from the opening at one end located on the upper side of the slope to let the rice grain flow out from the long hole, and place a foreign substance larger than the rice grain on the lower side of the slope. 2. Extracted from the opening at the other end.
A method for selecting foreign substances in a rice grain group described. 5. The foreign matter larger than the rice grains produced between the rice polishing machine and the packaging machine is selected as the object to be sorted.
A method for selecting foreign substances in a rice grain group described. 6. A substantially V-shaped standing wall in which elongated holes are provided in a direction orthogonal to the longitudinal direction of the selection cylinder, and between the elongated holes along the longitudinal direction, the substantially V-shaped standing wall projects toward the inside of the selection cylinder. The method for selecting foreign matter in a rice grain group according to any one of claims 1 to 5, wherein a sorting cylinder provided with is used.