JPS61149279A - Cereal elevating spiral body of cereals selector - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a grain sorting machine that sorts and removes immature grains, broken grains, etc. while frying grains such as rice. This invention relates to a grain lifting spiral body that ascends and conveys grains.

[Prior art] Conventionally, regarding this type of grain sorting machine, there was a
142139, JP 57-177381, JP 58-148475, JP 58-15
Its basic structure has already been disclosed in JP-A No. 3582 and JP-A-58-T5E377.

As shown in FIG. 6, in these grain sorting machines, a cylindrical sorting net body 2 and a grain lifting spiral body 3 fitted inside the sorting net body 2 are arranged concentrically and rotatably with each other in an outer shell. The grains fried by the grain frying spiral body 3 fall onto the upper partition plate 15 from the discharge port 23 a bored in the upper part of the sorting net body 2 . The upper grains are sorted through the screening net 2.
The scraper 16 fixed to
It is designed so that it is guided into the hopper 8 from the inside.

The sorting net 2 used in these grain sorting machines is
As shown in FIG. 7, it has a cylindrical shape composed of a lower tube 21, an intermediate mesh tube 22, and an upper tube 23, and a large number of meshes 22a are perforated in the entire area of the mesh tube 22 in an orderly manner in the direction of rotation. has been done. This sorting net body 2 is attached to the drive shaft 6 with a joint part 20.
are connected at the point. The drive shaft 6 extends inside the grain lifting spiral 3, has a lower end 6a connected to a motor M via a gear box G, and has an upper end 6b pivotally supported by the top plate 7.

In addition, as shown in FIG.
is rotatably supported by.

On the other hand, the grain lifting spiral body 3 has a spiral blade 32 provided on the outer periphery of a spiral shaft 31. The spiral blade 32 has a part of the sorting net body 2 facing the lower cylinder 21 as a supply area 33, a part facing the mesh cylinder 22 as a sorting area 34, a part facing the upper cylinder 23 as a take-out area 35, and The lowermost end, which is the lower part of the supply area 33, is divided into two areas 3B, which are divided into action areas. The bottom plate 30 of the grain lifting spiral body 3 is connected to a rotating fill connected to a motor M via a gear box G, and the grain raising spiral body 3 is rotated by rotation of the rotary disk 11.
rotates around the drive shaft 6.

- Grain, such as rice, which has been sorted by the grain sorter and stored in the hopper 8, is weighed in a predetermined amount and packed into bags.

[Problems to be Solved by the Invention] By the way, conventional grain sorting machines have poor sorting accuracy, so they must be sorted multiple times.

A predetermined selection rate was ensured.

However, recently, the above-mentioned bagging work has been automated and carried out 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 to attach a resistor such as rubber to the upper surface of the spiral blade, which has a large sliding friction resistance. For example, JP-A-513-329
An example thereof is disclosed in Japanese Patent No. 85.

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, causing its powder to adhere to the grain. There is a problem of contamination.

However, if such abrasion powder adheres to grains, it is not a big problem because the grains themselves are used after being polished, but it does cause the problem that powders such as rubber are mixed in with rice bran, making them unusable. arise.

As described above, conventional grain frying spirals have low sorting accuracy, and even if the accuracy is slightly improved, there are problems such as peeling of the outermost layer of grains and contamination.The present invention solves these problems. The purpose of this invention is to provide a grain frying spiral for a grain sorting machine that can greatly improve sorting accuracy and does not cause peeling or contamination of the outermost layer of grains. shall be.

[Means for Solving the Problems] The present invention has a spiral blade on the outer periphery of a helical shaft, which is fitted concentrically and rotationally within a cylindrical sorting net, and is capable of handling grains. This is the main part of the sorting machine, and by the rotation of the helical shaft, the grain is transported upward by the spiral blades from the scooping area at the lowest end, through the sorting area, to the take-out area. μ is applied to the fried grain spiral,
As a means for solving this problem, a convex portion is provided on the upper surface of at least a portion of the spiral blade existing in the sorting area.

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. Although the forming position is the sorting area of the spiral blade, it may be extended to other areas.

In the case of a hemisphere, they are arranged discretely or regularly distributed. On the other hand, in the case of protrusions, they are usually arranged radially or concentrically.

For example, in the case of a hemisphere, the appropriate size of the convex portion is such that the radius is about 2 to 6 times the short axis of the grain. Further, the protrusion height is suitably within twice the breadth of the grain. However, the size is not limited to this range.

[Function] The present inventor has experimentally discovered that when the spiral blade is provided with a convex portion, 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 at least the portion of the spiral blade existing in the sorting area improves the accuracy of sorting grains. Although its mechanism of action is not necessarily clear, it is believed that the grains in this area are sufficiently agitated, that the proportion of grains that are pressed against the sorting net increases, and that the grains that remain near the inner periphery of the sorting net are This is thought to be due to frequent replacement.

[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 30 is constructed by providing a spiral blade 32 on the outer periphery of a cylindrical spiral shaft 31.

The helical blade 32 has an action area from the upper part of the helical shaft 31, a take-out area 35, a sorting area 34, a supply area 33, and a scraping area 36.
It is continuously provided with 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 provided with an inclined part 321 having a slope with respect to the radial direction of the helical shaft 31 on the inner peripheral side in the sorting area 34, and a slope part 321 that has a slope with respect to the radial direction of the helical shaft 31 on the outer peripheral side. A horizontal portion 322 is provided parallel to the direction. However, the sorting area 34 of the spiral blade 32 is not limited to this form, and may be only a horizontal part where the mounting angle is 0 degrees or only an inclined part where the mounting angle is not 0 degrees.

”-The spiral blade 32 is, as shown in FIGS. 3A and 3B,
A convex portion 3 is provided on the upper surface of the horizontal portion 322 in the sorting area 34.
20 is the default. In this embodiment, this convex portion 320 is
As shown in FIG. 3C, the metal plate forming the spiral blade 32 is pressed from the lower surface side and is formed by protruding hemispherically from 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. In the case of this embodiment, it is provided at a location slightly inside from the outer periphery.

The length Sl and the protruding height S2 are appropriately set through experiments, but in the case of this embodiment, both are 3III11.

Note that a scraping claw 37 is provided at the starting end of the spiral blade 32.

<Effects of Examples> Next, the operation of the above embodiment will be explained.

The grain frying spiral of the second 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. , rotates the motor M, and connects the drive shaft 6 via the gearbox G.
and rotates the rotary disk 11. The rotation of the rotary disk 11 causes the grain frying spiral 3 to rotate around the drive shaft 6, and the rotation of the drive shaft 6 causes the sorting net 2 to rotate.

As the grain lifting spiral body 3 rotates, the grains supplied into the grain receiving tube 5 are scraped up by the scraping claws 37 of the spiral blades 32 in the scraping region 3B.

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 are separated from the mesh cylinder 22 by the action of centrifugal force.
At this time, fine particles smaller than the mesh 22a are sieved out to the outside of the mesh tube 22 and fall onto the horizontal partition plate 12-H, where they are passed through the scraper blade 1.
3 to the discharge port 42 and discharged to the outside.

At this time, due to the convex portion 320 provided on the spiral blade 32,
The grains are stirred. Further, 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 particles 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 removal area 35.

The grains fried to the top of the take-out area 35 are sent to the discharge port 23.
a is discharged into the storage section of the hopper 8 and stored.

As described 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 in 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, the experimental conditions will be shown.

However, conventional products... conventional sorting machines that use a grain frying spiral.

Invention: A sorting machine using the grain frying spiral of the present invention.

(a) Grain sorter used in the experiment Exactly the same format except for the grain frying spiral part.

(b) Structure of grain frying spiral Conventional product Invention Length of helical shaft 850mm 850mm Diameter of helical shaft 1110mm 1110mm Outer diameter of spiral blade 2813mm 288mm Number of turns of spiral blade
18 turns 19 turns spiral blade pitch 50mm
Number of convex parts per circumference of 50 mm 0 pieces 8 pieces (C) Structure, formation range and position structure of the convex parts... Hemispherical range with a radius of 3 mm and a protrusion height of 3 mm... Outer peripheral side end of the spiral blade sorting area Position: 3ff1m from the outer periphery (d) Sample brown rice, paddy rice, wet brown rice moisture content...15.3% Sample brown rice good rate...84.8% Sample brown rice scraps Rice rate: 5.1% The results of experiments repeated several times under the above conditions for selection accuracy are as follows.

■ Selection rate Conventional product Invented product First quality rice rate 98.0% 88.0% - Dump waste rice rate
2.0% 1.0% Second row good rice rate 8.2%
8.1% No. 2 waste rice rate 91.8% 81.8% ■ Sorting rate - Conventional product Invention product Good rice No. 1 rate! , 8Ei% 99, f ('0% Waste rice second rate 85.30% 81.92% 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 turn per hour, using the following formula.

As is clear from the above experimental results, if the grain frying spiral of the present invention is used, the first quality rice rate and the second waste sorting rate can be improved, and the sorting accuracy can be improved.

<Modification of Example> In the above example, six hemispherical convex portions were regularly provided on the spiral blade, but less than six or seven or more convex portions may be provided regularly or discretely. Good too.

Furthermore, a convex portion of a protrusion may be provided. The convex portions of the protrusions can be arranged concentrically, radially, or the like.

FIG. 4 shows an example in which the convex portions of the protrusions are arranged radially.

In the example shown in the figure, convex portions 320 of protrusions are arranged radially at equal intervals in the sorting area of the helical blade 32 whose attachment angle to the helical shaft 31 is 0 degrees.

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 embodiment, this receding angle α is
It is about 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 protrusion height of the protrusion 320 of the protrusion is the same as that of the hemispherical protrusion in the embodiment described above.

FIG. 5 shows an example in which a large number of hemispherical convex portions are arranged in a staggered manner.

The grain lifting spiral body shown in the same figure has hemispherical convex portions 320 provided alternately on the outer circumferential side and the inner circumferential side on seven sides of the horizontal portion 322 in the sorting area of the spiral blade 32, and is arranged in a staggered manner. .

[Effects of the Invention] As explained above, the present invention provides a grain lifting spiral body that uses spiral blades to transport grain upward from the raking area at the lowest end to the removal area via the sorting area by rotating the helical shaft. The configuration in which a convex portion is provided on the upper surface of the spiral blade in the sorting area has the effect of improving sorting accuracy without causing peeling or contamination of the outermost layer of grains.

[Brief explanation of drawings]

1A to 3C show an embodiment of the grain frying spiral of the present invention, FIG. 1A is a front view thereof, FIG. 1B is a left side view thereof,
Figure 2A is its top view, Figure 2B is its bottom view, and Figure 3A is its top view.
The figure 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 is a partially enlarged sectional view showing the convex portion provided on the spiral blade in the above embodiment. , 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 partially enlarged sectional view showing another modified example of the convex part, and FIG. 6 is a conventional fried grain. FIG. 7 is a sectional view showing a grain sorter equipped with a spiral body, and a perspective view showing a sorting net used in the grain sorter.

Claims (1)

[Claims] The spiral shaft has a spiral blade on its outer periphery, and is fitted concentrically and rotatably inside a cylindrical sorting net to constitute the main part of the grain sorter. In a grain lifting spiral body that uses spiral blades to transport grain upward from a raking area at the lowest end to a sorting area to a take-out area by rotation of A grain lifting spiral body of a grain sorting machine, characterized in that the grain sorting machine comprises: