JPH0118787B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention moves grains such as rice and wheat and other granules in a cylindrical sorting tube installed upright inside a cylindrical shell. This invention relates to a vertical grain sorter that separates large grains into regular grains and small waste grains.

(Prior Art) A vertical granule sorter in the prior art is described in Japanese Patent Application Laid-open No. 153562/1983, which was filed by the present applicant and has already been published.

The overall structure of the vertical granule sorter is as shown in FIG. A helical tube 3 screwed onto the body 1 is installed vertically. The helical tube 3 is rotated by a motor 9 via a gear box 10 at a speed of, for example, 350 rpm, and the sorting tube 4 is rotated at a speed of, for example, 80 rpm in the opposite direction to the helical tube 3. be. The granules introduced from the granule input port 11 are placed on the helical blades 2 and are raised by the rotation of the helical tube 3. At this time, the particles are subjected to centrifugal force from the upper surface of the helical blade 2 and are pressed against the inner circumferential surface of the sorting cylinder 4. The sorting section 12 of the sorting tube 4 has a sorting port 13 of a predetermined size that allows small diameter and broken particles to pass through but does not allow large diameter particles to pass through. The waste particles fly out into the sorting area 14 through the sorting port 13 and are sent to the shell body 8 through the waste outlet 15.
The large-diameter sized particles rise to the top and jump out from the discharge window 16 into the take-out area 17, then flow into the hopper 18, and exit from the sized granule outlet 19 of the hopper 18. taken out.

By the way, the above-mentioned patent publication discloses a technical concept in which the upper surface of the helical blade 2 is made a surface layer having a dynamic frictional resistance greater than that of a flat metal plate in order to improve the sorting function, and the technical means thereof are as follows: The upper surface of the helical blade 2 is provided with small protrusions, small holes, protrusions, grooves, etc., the height and depth of which are approximately 1/5 to 1/2 of the diameter of the grain.

(Problems to be Solved by the Invention) In order to improve the sorting function of the vertical granule sorter described in the above-mentioned published patent application, the technical means is to use the granules in a state where the granules are thinly placed on the upper surface of the helical blade 2. In this case, the dynamic frictional resistance of the surface works well and the stirring function is achieved. However, if a large amount of particles are placed on the upper surface of the spiral blade 2, the stirring function will deteriorate. Therefore, in order to sort a large amount of particles, it is necessary to widen the upper surface of the spiral blade 2 so that the particles can be thinly placed on it, and the diameters of the spiral tube 3 and sorting tube 4 must be made large. In addition,
The entire shell 8 has a large diameter.

(Means for Solving the Problems) The present invention is designed to exhibit a good sorting function without expanding the upper surface of the helical blade 2 even when processing a large amount of granules, and is configured as follows. did.

In other words, a helical tube 3 having helical wings 2 projecting from the outer peripheral surface of an upright cylindrical body 1 extending in the radial direction is fitted concentrically into a cylindrical sorting tube 4 that is also upright. In the type granule sorter, an agitating surface 6 is formed on the upper surface of the helical blade 2 and extends from a position appropriately inward from the outer circumferential edge 5 to the outer circumferential surface of the cylindrical body 1, perpendicular to the rotational direction P or receding θ. It was constructed by providing a tool 7.

(Operation of the invention) The particles placed on the upper surface of the helical blade 2 are
The particles move while sliding on the upper surface due to the rotation of the granules, but this slipping is blocked by the stirring tool 7, and the particles move outward along the vertical surface 6 without stagnation, and during the outward movement, the particles The agitation action between them works and the outer peripheral end of the helical blade 2, which is away from the vertical surface 6, moves while slidingly contacting the inner peripheral surface of the sorting tube 4, and the particles are not subjected to sudden conveying action. Since the dust particles are well stirred, the waste grains can be well sorted out by the sorting section 12 of the sorting cylinder 4.

(Effect of the invention) The particles placed on the inside of the upper surface of the spiral blade 2 are stirred and sorted while being sent outward by the vertical surface 6 of the stirring tool 7, so even when there is a large amount of particles to be sorted, the particles are The helical blade 2 having a narrow upper surface width exhibits a sufficient sorting function, and a large amount of granules can be sorted with a small granule sorter without increasing the size of the entire machine frame 8.

(Example) Next, a vertical grain sorter that sorts brown rice as grains will be described.

1 and 2 show a part of the helical tube 3 corresponding to the sorting part 12 of the sorting tube 4, and the upper surface of the helical blade 2 has a stirring tool having an vertical surface 6 made of a substantially vertical surface. 7 are attached at four equally spaced positions on the circumference by a joining edge 20 that is joined and fixed to the outer peripheral surface of the cylindrical body 1 and a joining edge 21 that is joined and fixed to the upper surface of the helical wing 2. The receding angle θ of this vertical surface 6 with respect to the rotational direction P is approximately 60°, and the distance from the outer circumferential end 5 of the helical blade 2 to the outside of the stirring tool 7 with respect to the diameter of the cylindrical body 1 of 215 mm and the outer circumferential end diameter of the helical blade of 266 mm. The distance to the edge is 6.5
mm. Further, the upper edge of the stirring tool 7 is lowered toward the outside, and has an inner dimension 6 of 12 mm and a tip dimension C of 4 mm. In this case, the sorting tube 4
The inner circumference diameter is 276mm. The height of the vertical surface 6 is determined depending on the number of grains to be sorted, but if it is about 5 to 2 times the diameter of the grains, the rotational load on the helical tube 3 will not become excessive and will be good. .

The number of stirring tools 7 to be provided may be three or five on the circumference, but if the number is too large, the movement effect of the particles will be too low, and if it is too small, the movement will be too fast and the stirring effect will not be sufficient.

Further, the receding angle θ of the vertical surface 6 of the stirring tool 7 may be set to an arbitrary angle greater than 0° and smaller than 90°, but as the angle becomes smaller, it is necessary to increase the rotational driving force. As the angle becomes larger, the stirring effect decreases, so an angle of about 30° to 60° is good.

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention, FIG. 1 is an enlarged plan sectional view of a part, and FIG.
It is an enlarged front sectional view of the section. FIG. 3 is a front sectional view showing the overall structure of the vertical granule sorter. 1... Cylindrical body, 2... Spiral wing, 3... Spiral tube, 4... Sorting tube, 5... Outer peripheral end of helical wing, 6
...Elevation, θ...Retreat angle.

Claims (1)

[Claims] 1. A helical tube 3 is provided with helical wings 2 projecting from the outer peripheral surface of the cylindrical body 1 which is erected and extends in the radial direction.
In a vertical particle sorter that is fitted concentrically into a cylindrical sorting tube 4 that is also set upright, the cylindrical body 1 is placed on the upper surface of the helical blade 2 from a position appropriately inward from the outer peripheral edge 5. A stirring tool 7 consisting of an vertical surface 6 that is perpendicular to the rotational direction P or receded θ over the outer peripheral surface.
A vertical granule sorter characterized by being equipped with.