JPH0323336Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Field of Industrial Application] The present invention relates to a grain-frying spiral that lifts up grains and conveys them upward in a grain sorting machine that separates and removes immature grains, broken grains, etc. while frying grains such as rice. . [Prior art] Conventionally, regarding this type of grain sorting machine,
In JP-A-59-14269, JP-A-57-177381, JP-A-58-146475, JP-A-58-153562, JP-A-58-156377, etc., the basic structure is as follows. Already disclosed. These grain sorters, as shown in Figure 5,
A cylindrical sorting net 2 and a grain frying spiral 3 fitted inside the sorting net 2 are erected in an outer shell 4 concentrically and rotatably with each other.
The fried grains fall onto the upper partition plate 15 from the discharge port 23a formed in the upper part of the sorting net 2, and the grains on the partition plate 15 are fixed to the sorting net 2. The scraper blades 16 transport the material to an outlet 45 formed in a part of the upper outer periphery of the outer shell 4, and guide it into the hopper 8 from the outlet 45. As shown in FIG. 6, the sorting net body 2 used in these grain sorting machines has a cylindrical shape composed of a lower tube 21, an intermediate screen tube 22, and an upper tube 23. A large number of meshes 22a are perforated in the entire area of the cylinder 22 in an orderly manner in the direction of rotation. The sorting net 2 is connected to the drive shaft 6 at a joint portion 20. The drive shaft 6 extends inside the grain lifting helix 3, has a lower end 6a connected to a motor M via a gearbox G, and has an upper end 6b pivotally supported by the top plate 7. Further, as shown in FIG. 6, the lower tube 21 of the sorting net body 2 is rotatably supported by a guide roller 10 disposed on the upper end surface 51 of the grain receiving tube 5. As shown in FIG. On the other hand, in the grain lifting spiral body 3, a spiral blade 32 is provided on the outer periphery of a spiral shaft 31. The spiral blade 32 is
The part of the sorting net body 2 facing the lower tube 21 is called the supply area 33, and the part facing the screen tube 22 is called the sorting area 3.
4, the part facing the upper cylinder 23 is the extraction area 35.
Furthermore, the lowermost end of the supply area 33 is used as a scraping area 36, which is divided into action areas. The bottom plate 30 of the grain lifting spiral body 3 is connected to a rotary disk 11 connected to a motor M via a gearbox G.
The rotation of the rotary disk 11 causes the grain frying spiral body 3 to rotate around the drive shaft 6. The grains, such as rice, which have been sorted by the grain sorter and stored in the hopper 8, are weighed in a predetermined amount and packed into bags. [Problems that the invention aims to solve] By the way, conventional grain sorting machines do not have very good sorting accuracy, so they have to carry out sorting multiple times.
A predetermined selection rate was ensured. However, recently, the above-mentioned bagging work has been automated and performed with high efficiency. Therefore, it is necessary to ensure a predetermined selection rate through one selection using a grain sorter. Therefore, in order to improve the sorting accuracy, it has been proposed that a resistor such as rubber having a large sliding friction resistance is attached to the upper surface of the spiral blade. For example, one example is disclosed in Japanese Patent Application Laid-Open No. 59-32985. Although the mechanism of action of the device provided with such a resistor is not clear, the selection accuracy is slightly improved compared to the device without the resistor. However, when a resistor such as rubber is attached, the friction with the grain is large, so in the case of brown rice, for example, the bran layer may peel off, or the resistor itself may wear out and its powder may adhere to the grain. There is a problem of contamination. Of course, when such abrasion powder adheres to grains, the grains themselves are polished and used.
Although this is not a serious problem, powders such as rubber are mixed into bran, which causes the problem that it becomes unusable. As described above, the conventional grain frying spiral has low sorting accuracy, and even if the accuracy is slightly improved, there are problems such as peeling of the outermost layer of the grain, contamination, etc. The present invention has been developed by focusing on these problems, and is a method for frying grains in a grain sorting machine that can greatly improve sorting accuracy and does not cause peeling or contamination of the outermost layer of grains. The purpose is to provide a helix. [Means for Solving the Problems] The present invention has a spiral blade on the outer periphery of a spiral shaft, which is fitted concentrically and rotatably inside a cylindrical sorting net, and is used in a grain sorting machine. It is applied to a grain lifting spiral body that constitutes the main part and uses spiral blades to transport grain upward from the scraping area at the lowest end to the sorting area to the take-out area by rotating the helical shaft, and as a means to solve the problem, It is characterized by having the following configuration requirements. First, convex portions are provided at intervals of 100 to 250 mm on the upper surface of the portion of the spiral blade that exists in the sorting area. Second, the convex part has a diameter of the hemisphere in the case of a hemispherical shape, or a short axis in the case of a grain other than a hemisphere, which is 2 to 6 times the short axis of the grain, and a protruding height. is equal to or about twice the breadth of the grain. Thirdly, the convex portion extends from the outer periphery of the spiral blade.
It is arranged so that its outer peripheral side end is positioned inside the grain by a length approximately twice the breadth of the grain. Next, the above configuration requirements will be explained in more detail. In the above configuration, the convex portion provided on the upper surface of the spiral blade can be, for example, hemispherical or protruding. These are easily formed by pressing or the like when forming the spiral blade. The area formed is the sorting area of the spiral blade, but it may be extended to other areas. In the case of a hemisphere, they are formed at regular intervals on the same circumference. This interval varies depending on the outer circumference of the spiral blade, but is suitably about 100 to 250 mm. If they are arranged too closely, the sorting effect will be too strong and the sorted grains will often be treated as waste grains. On the other hand, if the interval is too large, the effect of the convex portion will be weakened. On the other hand, in the case of protrusions, they are arranged almost radially. The spacing is approximately the same as in the case of the hemisphere. The width and protrusion height of this convex portion are both determined based on the grain. For example, in the case of a hemisphere, the appropriate width is about 2 to 6 times the diameter of the grain. Further, the protrusion height is suitably within twice the breadth of the grain. Further, the outer circumferential end of the convex portion does not coincide with the outer circumference of the spiral blade, but is provided at a position inside with a slight distance from the outer circumference. The above-mentioned interval is approximately twice the breadth of the grain. [Function] The inventor of the present invention has experimentally discovered that when a convex portion is provided on the spiral blade, grains are more easily pressed against the sorting net. The present invention has been made based on this knowledge. Its action is as follows. The convex portion provided on the upper surface of the portion of the spiral blade in the sorting area improves the accuracy of grain sorting.
Although its mechanism of action is not necessarily clear, it is important to note that the grain in this region is sufficiently agitated, and
This is thought to be due to the fact that the ratio of grains being pressed against the sorting net increases, and the grains staying near the inner periphery of the sorting net are frequently replaced. Further, since the convex portion is provided inside the spiral blade with a slight interval from the outer periphery, grains are prevented from being caught in the gap between the mesh tube and the convex portion and being crushed. The width and protrusion height of the convex portion are set within the above-mentioned ranges because if it is too small, sufficient stirring action cannot be achieved, whereas if it is too large, it will actually hinder the replacement of grains. This is because it will happen. [Example] Hereinafter, an example of the present invention will be described with reference to the drawings. Note that the same parts as in the conventional example are given the same reference numerals. <Configuration of Example> The grain frying spiral body of the present invention shown in FIGS. 1A to 3C is constructed by providing a spiral blade 32 on the outer periphery of a cylindrical spiral shaft 31. The spiral blade 32 extends from the upper part of the spiral shaft 31 into a take-out area 35, a sorting area 34, a supply area 33, and a scraping area 36.
Each of the action areas is successively provided by one spiral blade, and the basic structure is the same as the spiral blade of the conventional grain frying spiral body. The difference from the conventional one is the sorting area 34. In the case of this embodiment, the spiral blade 32 is arranged in the sorting area 34.
, an inclined portion 321 having a slope with respect to the radial direction of the helical shaft 31 is provided on the inner circumferential side, and a horizontal portion 322 parallel to the radial direction of the helical shaft 31 is provided on the outer circumferential side. However, the spiral blade 32
The sorting area 34 is not limited to this form.
It is also possible to use only a horizontal part with a mounting angle of 0° or only a sloped part with a non-zero mounting angle. As shown in FIGS. 3A and 3B, the spiral blade 32 is provided with a convex portion 320 on the upper surface of a horizontal portion 322 in the sorting area 34. In this example,
As shown in FIG. 3C, the convex portion 320 is formed by pressing the metal plate forming the spiral blade 32 from the lower surface side and protruding hemispherically toward the upper surface side. The radius R of this hemisphere is approximately 3 mm. In this embodiment, six convex portions 320 are arranged for each circumference so that one circumference of the spiral blade 32 is approximately divided into six equal parts. The arrangement position is near the outer periphery of the horizontal portion 322 and slightly inside from the outer periphery. This length S1 and protrusion height S2
are appropriately set through experiments, but in the case of this example, both are 3 mm. Note that a scraping claw 37 is provided at the starting end of the spiral blade 32. <Operation of the embodiment> Next, the operation of the above embodiment will be explained. The grain lifting spiral body of the above embodiment can be applied to the grain sorting machine shown in FIG. In order to fry grains using the grain frying spiral of the above embodiment installed in the grain sorting machine shown in FIG.
Meanwhile, the motor M is rotated to rotate the drive shaft 6 and rotary disk 11 via the gearbox G. The rotation of the rotary disk 11 causes the grain lifting spiral body 3 to rotate around the drive shaft 6, and the rotation of the drive shaft 6 causes the sorting net 2 to rotate. Due to the rotation of the grain lifting spiral body 3, in the raising area 36,
The scraping claws 37 of the spiral blades 32 scrape up the grains supplied into the grain receiving tube 5. The supply area 33 further transports the raked grains upward and sends them to the sorting area 34. In the sorting area 34, the grains hit the mesh pipe 22 due to the action of centrifugal force, and fine grains smaller than the mesh 22a are
It is sieved to the outside of the screen tube 22 and falls onto the horizontal partition plate 12, transferred to the discharge port 42 by the scraper blades 13, and discharged to the outside. At this time, the convex portion 320 provided on the spiral blade 32
The grains are stirred. Furthermore, the grains staying near the inside of the mesh tube 22 are pressed against the mesh body 2 or have their posture changed by the convex portions 320. As a result, fine grains can easily pass through the mesh 22a, and grains that do not pass through the mesh 22a are replaced with other grains. Therefore, the sorting efficiency in the mesh 22a is improved. In this way, grains larger than the mesh 22a of the mesh tube 22 remain and are lifted up in the sorting area 34 and fed and conveyed to the take-out area 35. The grains fried to the top of the take-out area 35 are discharged from the discharge port 23a into the storage section of the hopper 8,
stored. As mentioned above, the grain frying spiral of the present invention has high sorting accuracy. When comparing this, the grain frying spiral of the present invention and the conventional grain frying spiral were respectively installed on a grain sorting machine of exactly the same type except for the grain frying spiral. This grain sorting machine has improved sorting accuracy compared to the conventional grain sorting machine equipped with a grain lifting spiral. Therefore, a specific experimental example will be shown below. <Experimental Example> First, experimental conditions will be shown. However, conventional product...a conventional sorting machine using a grain frying spiral Invented product...a sorting machine using a grain frying spiral of the present invention Comparative product...a sorting machine using a grain frying spiral with more convex parts than the invented product (a ) Grain sorting machine used in the experiment Exactly the same model except for the grain lifting spiral part. (b) Structure of grain frying spiral

[Table] (c) Structure, formation range, and position of the convex part Structure: Hemispherical with a radius of 3 mm and protrusion height of 3 mm Range: Spiral blade sorting area Outer edge position: 3 mm from the outer circumference (d) Provided Test brown rice Paddy-grown brown rice Moisture content...15.3% Test brown rice quality rate 94.9% Test brown rice waste rate 5.1% The results of repeating the experiment several times under the above conditions to check the sorting accuracy are as follows. street. Selection rate Conventional product Invented product Comparative product First-quality rice rate 98.0% 99.0% 99.1% First-mouth waste rice rate 2.0% 1.0% 0.9% Second-best-quality rice rate 8.2% 8.1% 11.3% Second-mouth waste rice rate 91.8% 91.9% 88.7% Sorting rate Conventional product Invented product Comparative product Good rice first mouth rate 99.66% 99.60% 99.40
% Waste rice secondary ratio 65.30% 81.92% 85.55
% However, in the above data, the first port is the discharge port 23a, and the second port is the discharge port 42. Further, the sorting rate is calculated as the weight ratio of grains discharged at each port per hour using the following formula. Good rice first rate =
Most palatable rice (Kg/h)/Ichiban palatable rice + Second palatable rice (Kg/h)
h) Waste rice second rate =
Second mouth waste rice (Kg/h) / First mouth waste rice + Second mouth waste rice (Kg/h)
h) As is clear from the above experimental results, when the protrusions are provided, the ratio of good rice in the first mouth and the waste rice sorting rate in the second mouth are improved, but if the number of protrusions is too large, on the contrary,
The ratio of good rice in the second mouth increases, the amount of good rice in the first mouth decreases, and the grains discharged into the second mouth must be re-sorted. Therefore, it is clear that the use of the grain frying spiral of the present invention is effective. <Modification of the embodiment> FIG. 4 shows an example in which the convex portions of the protrusions are arranged radially. In the example shown in the figure, a convex portion 32 of a protrusion is placed in a sorting area of a helical blade 32 whose attachment angle with respect to a helical shaft 31 is 0 degrees.
0 are arranged radially at equal intervals. In the case of this embodiment, the convex portion 320 of the protrusion is arranged at a slight angle with respect to the radial direction. This angle is provided in a direction opposite to the direction of rotation of the helical shaft 31 and is referred to as a receding angle. In this example,
This receding angle α is approximately 5 degrees. Further, the convex portion 320 of the protrusion is provided such that its outer circumference side end portion is located slightly inside the outer circumference of the spiral blade 32. The distance between this outer circumferential end and the outer circumference is the same as in the case of the hemispherical convex portion in the embodiment described above. Further, the protruding height of the convex portion 320 of the protrusion is set to be the same as that of the hemispherical convex portion in the above-described embodiment. [Effects of the invention] As explained above, the present invention is capable of sorting in a grain lifting spiral body in which grains are conveyed upward from the raking area at the lowest end to the removal area via the sorting area using the spiral blades by rotating the helical shaft. The configuration in which a convex portion is provided on the upper surface of the spiral blade in the area has the effect of greatly improving sorting accuracy without causing peeling or contamination of the outermost layer of grains.

[Brief explanation of the drawing]

Figures 1A to 3C show an embodiment of the grain-frying spiral of the present invention; Figure 1A is a front view thereof, Figure 1B is a left side view thereof, Figure 2A is a plan view thereof, and Figure 2B is a bottom view thereof. Figure 3A is a partially enlarged sectional view of the grain-frying spiral used in the above embodiment, Fig. 3B is a partially enlarged front view thereof, and Fig. 3C shows a convex portion provided on the spiral blade in the above embodiment. Partially enlarged sectional view,
FIG. 4 is a partially enlarged perspective view showing a modified example of the convex part that can be used in the above embodiment, FIG. 5 is a sectional view showing a grain sorting machine equipped with a conventional grain lifting spiral, and FIG. FIG. 2 is a perspective view showing a sorting net used in the machine. 2... Sorting net body, 3... Grain frying spiral body, 31...
Spiral shaft, 32... Spiral blade, 33... Supply area, 3
4... Sorting area, 35... Taking out area, 36... Scraping area, 37... Scraping claw, 4... Outer shell body.

Claims (1)

[Claims for Utility Model Registration] Consisting of a helical shaft with a helical blade on the outer periphery, the grain sorting machine is fitted concentrically and rotatably inside a cylindrical sorting net to constitute the main part of the grain sorting machine, In a grain lifting spiral body that uses spiral blades to transport grain upward from the scraping area at the lowest end to the sorting area and to the take-out area by rotating the spiral shaft, a convex portion is formed on the upper surface of the portion of the spiral blade that exists in the sorting area. The convex portions are arranged at intervals of 100 to 250 mm, and the convex portions measure the diameter of the hemisphere if the grain is hemispherical, or the short axis of the grain if the grain is not hemispherical. 6 times, the protrusion height is equal to or about twice the breadth of the grain, and the protrusion has a length from the outer periphery of the spiral blade to about twice the breadth of the grain. A grain lifting spiral body for a grain sorting machine, characterized in that the grain lifting spiral body is arranged so that its outer circumference side end is located at an inside position.