JP2006075790A - Removing apparatus of foreign matter of small specific gravity in particulate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a removing apparatus of foreign matter of small specific gravity with simple constitution, capable of moving particulate easily in a uniform thin layer, and enhancing the treating capacity of the foreign matter of small specific gravity. <P>SOLUTION: This removing apparatus 1 of foreign matter of small specific gravity is provided with a supply port 21 at a lower end part, a supply part 11 supplying particulate from an upper part to a lower part, a recessed type rotary vessel 12 rotatably provided around a vertical axis and moving the particulate supplied from the supply part 11 to a large diameter side by centrifugal force, a suction part 13 having a suction port 27 near the upper part of a tilted inner periphery face nearer to the uppermost edge than to a center of the vessel 12, and a recovering part 14 of a shape surrounding the uppermost edge of the vessel 12, and formed to receive the particulate overflowing from the uppermost edge of the vessel 12 by centrifugal force and being discharged to the outside thereof. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an apparatus for removing small-specific-gravity foreign matter that is suitable for removing and collecting small-specific gravity foreign matter including hair and fibers in the granular material.

Conventionally, in order to remove foreign matter mixed in the granular material, the granular material is supplied onto the belt conveyor so as to form a uniform thin layer, and in the process of horizontally conveying the granular material, it is optically powdered. An apparatus that detects and removes foreign matter mixed in a granule is known (for example, see Patent Documents 1 and 2).
JP 2000-84496 A JP 2000-162136 A

  In order to optically detect foreign matter mixed in the powder and remove it, the powder must first be formed into a uniform thin layer. In the apparatus described in Patent Document 1, the granular material is made uniform using a squeeze roller on the first conveyor and then transferred onto the second conveyor. In the apparatus described in Patent Document 2, The powder particles are leveled by vibrating. In any case, the transport amount of the granular material is determined by the width of the conveyor, the thickness of the layer of the granular material, and the conveyor speed. Since the detectable range of the optical sensor for optically detecting foreign matter mixed in the powder is limited, there is a limit to increasing the width of the conveyor. The thinner the layer, the better. Moreover, since the granular material does not follow even if the conveyor speed is increased unnecessarily, there is a limit to increasing this. For this reason, the conveyance amount of the granular material per unit time, and thus the processing capacity for removing foreign matter is limited, and in order to compensate for the insufficient processing capacity, a belt including a powder supply unit, a foreign matter detection unit, etc., together with this belt conveyor There is a problem that it is difficult to increase the processing capacity because there is only an additional conveyor line. Moreover, in the case of each apparatus mentioned above, there existed a problem that a granular material could not necessarily be made into a uniform thin layer form by the kind of granular material. In particular, in the case where the foreign matter is a small specific gravity containing hair and fibers, there is a problem that this removal is difficult even though mixing into the powder is never allowed.

  An object of the present invention is to eliminate such a conventional problem, and with a simple configuration, it is possible to easily move a granular material in a uniform thin layer, and to improve the processing capacity for removing small specific gravity foreign substances. An object of the present invention is to provide an apparatus for removing foreign substances having a small specific gravity in a granular material.

  In order to solve the above-mentioned problem, the first invention has a supply port at the lower end portion, and is provided rotatably with a supply portion for supplying powder particles downward from above and a vertical axis, A concave rotary container that moves the granular material supplied from the supply part to the larger diameter side by centrifugal force, a suction part that has a suction port above the inner peripheral surface of the rotary container, and the rotary container And a recovery section formed so as to be receivable with respect to the granular material discharged to the outside beyond the uppermost edge of the rotating container by centrifugal force. did.

  In addition to the structure of 1st invention, 2nd invention receives the light which passed through the granular material from the light projection part which irradiates light to the granular material on the said rotation container, and an electrical signal from this light projection part The light receiving unit for conversion and the optical sensor unit for monitoring whether or not small specific gravity foreign substances including hair and fibers are mixed in the granular material from the electric signal are provided.

  In addition to the structure of 1st invention, the 3rd invention receives the light which passed through the granular material from the light projection part which irradiates light to the granular material on the said rotation container, and this light projection part, and it becomes an electrical signal The light receiving unit to be converted and the electrical signal are used to determine whether or not small specific gravity foreign substances including hair and fibers are mixed in the granular material. It was set as the structure which provided the optical sensor part to operate | move.

  According to the low specific gravity foreign substance removing device in the granular material according to the present invention, the apparatus has a simple configuration, and the small specific foreign material including hair and fibers mixed in the granular material is slower in movement than the granular material and moves. Since it has the property of appearing on the surface or surface of the powder during the process, it is particularly easy to separate and remove the powder, and even if the supply flow rate of the powder is increased, the rotational speed of the rotating container can be increased. Therefore, it is possible to easily form the granular material into a uniform thin layer, and it is possible to greatly increase the processing capacity for removing the low specific gravity foreign matter.

  In addition, by providing an optical sensor unit and thereby monitoring whether or not foreign matter is mixed in the granular material, the reliability of the apparatus can be improved.

  In addition, an optical sensor unit is provided, and when the foreign matter mixed in the granular material is detected, the suction unit is operated, so that the power consumption of the suction unit can be saved.

Next, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show a low specific gravity foreign substance removing device 1 for a powder and granular material according to the present invention, which includes a supply unit 11, a rotating container 12, a suction unit 13, a recovery unit 14, and an optical sensor. Part 15.

  The supply unit 11 is a cylindrical body having a circular horizontal cross section, has a supply port 21 at the lower end, and is connected to powder supply equipment (not shown), and the powder sent from here drops. , Supplied from the supply port 21 downward. In addition, it is preferable that the supply unit 11 is adjustable in height and can be replaced with one having a different inner diameter.

  The rotary container 12 is formed in a concave shape, and is provided at the upper end portion of the rotary shaft 22 provided to be vertically rotatable so as to be integrally rotatable therewith. The rotary shaft 22 is rotated by, for example, a timing belt 23 and a pulley 24 by a rotation driving unit (not shown). It is preferable that the rotational drive unit is variable speed. A cone 25 is provided on the upper end surface of the rotating shaft 22 that passes through the center of the rotating container 12 so as to be integrally rotatable with the rotating shaft 22 below the supply unit 11. In addition, each of the supply part 11, the rotation container 12, the rotating shaft 22, and the cone 25 is concentric. And the granular material which has fallen in the supply port 21 is equally distributed over the perimeter of the cone 25 along the slope which spreads below the rotating cone 25, and the rotating container which rotates similarly. 12 is supplied toward the large diameter side. On the rotating container 12, since the powder particles also rotate accompanying the rotating container 12, centrifugal force acts on the powder particles and moves to the larger diameter side as shown by a dashed line curve a in FIG. 2. At the same time, it spreads in the circumferential direction. That is, on the rotating container 12, the powder particles immediately move in the circumferential direction in a uniform and thin layer toward the larger diameter side. Note that the curve a is exemplarily shown at intervals of 90 degrees, and actually, there is a curve a indicating the movement trajectory of the granular material over the entire circumferential direction of 360 degrees.

  The suction unit 13 has a suction duct 26 connected to a collection facility (not shown), and the suction port 27 extends from the flat bottom surface of the rotating container 12 to the inner peripheral surface inclined so as to spread toward the uppermost edge, and above it. It is arranged in the proximity position. While the granular material supplied from the supply unit 11 to the rotating container 12 moves toward the large diameter side as described above, the small specific foreign matter including hair and fibers mixed therein is more slowly than the granular material. And move to the surface layer of the granular material while moving, or appear to float on the surface. Suction is always performed from the suction port 27. The lifted light foreign matter is immediately sucked and removed from the suction port 27 into the suction duct 26, and only the granular material from which the small specific gravity foreign matter has been removed is rotated by centrifugal force. This is discharged from the uppermost edge of the container 12 to the outside.

  The collection unit 14 has a shape that surrounds the uppermost edge of the rotating container 12, receives the granular material discharged to the outside beyond the uppermost edge of the rotating container by centrifugal force, and guides it to a collection facility (not shown). Is formed.

  The optical sensor unit 15 is a light projecting unit that irradiates light toward an inclined surface in the rotating container 12, a light receiving unit that irradiates the upper surface, receives light reflected from the upper surface, and converts the light into an electrical signal, and From this electrical signal, the presence or absence of foreign matter having a small specific gravity to be separated / removed including hair and fibers in the granular material is monitored. For this monitoring, for example, the presence or absence of a foreign object may be determined, and if a foreign object is detected, the light emitting diode may be caused to emit light. As a result, the presence or absence of small specific gravity foreign matter in the granular material can be confirmed and the reliability of the apparatus can be improved. However, a plurality of the specific gravity foreign matter may be provided, but only in terms of separation and removal of small specific gravity foreign matter. The optical sensor unit 15 is not necessarily required. In FIG. 2, a double-headed arrow b indicated by a two-dot chain line represents a foreign object detectable range of the optical sensor unit 15, and light is projected along the double-headed arrow b to detect a foreign object.

  On the other hand, the optical sensor unit 15 may be provided not for the above-described monitoring but for operating the suction unit 13 only when a foreign object is detected. In other words, when no foreign matter is detected by the optical sensor unit 15, the suction unit 13 is inactivated, and when the foreign matter is detected by the optical sensor unit 15, a foreign matter detection signal is output from the optical sensor unit 15. Based on this, the suction unit 13 may be switched to the operating state, and power consumption in the suction unit 13 may be saved. In this case as well, a plurality of optical sensor units 15 may be provided as described above.

  Thus, according to the small specific gravity foreign substance removing apparatus 1 that uses the rotating container 12 and moves the granular material by centrifugal force, it is compared with the above-described apparatus that horizontally conveys the granular material by the conveyor. In addition, it is possible not only to easily move the powder particles in a uniform thin layer with a simple configuration, but also to increase the rotational speed of the rotating container 12 to supply the powder particles onto the rotating container 12. Therefore, it is possible to greatly improve the processing capacity for removing the low specific gravity foreign matter. In addition, for small specific gravity foreign substances including hair and fibers, the behavior is different from the granular material, it moves to the surface layer while moving, and appears to float on the surface of the granular material. Although it is difficult to remove the small specific gravity foreign matter, it is difficult, but in the small specific gravity foreign material removal apparatus 1 in this granular material, by using the above-mentioned properties specific to the low specific gravity foreign matter. The certainty of the separation / removal can be increased.

  FIG. 3 shows an example of application of the small specific gravity foreign matter removing apparatus 1 to the granular material sorting apparatus 2. In FIG. 3, parts common to FIGS. .

  In the small specific gravity foreign matter removing apparatus 1, the collection unit 14 is formed so as to surround the rotating container 12, and a discharge port 31 opened downward is provided at the bottom of the inclined bottom surface. And the small specific gravity foreign material is removed, and the granular material discharged | emitted from the rotating container 12 is received on the said bottom face, and is discharged | emitted from the discharge port 31 below.

  The granular material sorting device 2 includes a granular material transporting unit 32 and an optical sensor unit 33. The granular material transport unit 32 is, for example, a rotating member that is rotatable about a vertical axis, and the granular material discharged from the discharge port 31 is centrifugally applied on the granular material transfer unit 32. While moving to the large diameter side, it becomes a uniform thin layer. And the presence or absence of the foreign material except the said small specific gravity foreign material in a granular material is detected by the optical sensor part 33 similar to the optical sensor part 15, and in the peripheral part which is not shown in figure by the large diameter side of the granular material transfer part 32 When the foreign matter is detected and when the foreign matter is not detected, the collection path of the granular material is switched so that the foreign matter and the granular material are sorted.

  In the above-described embodiment, the reflection type optical sensor units 15 and 44 are shown. However, the present invention is not limited to this, and includes a device using a transmission type optical sensor unit instead of the reflection type. . In addition, the suction port 27 of the suction unit 13 is preferably located above the rotating container 12 over as wide a range as possible in the radial direction. Furthermore, the cross-sectional shape of the supply unit 11 is not limited to a circular shape.

  The present invention is suitable for a granule inspection system for removing, for example, foreign substances or hair mixed in granules.

It is sectional drawing which shows the outline of the small specific gravity foreign material removal apparatus in the granular material which concerns on this invention. It is a top view shown in the partial cross section of the small specific gravity foreign material removal apparatus shown in FIG. It is a fragmentary sectional view which shows the outline of the example of application to the granular material screening device of the small specific gravity foreign material removal apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Small specific gravity foreign substance removal apparatus 2 Granule classification apparatus 11 Supply part 12 Rotating container 13 Suction part 14 Collecting part 15 Optical sensor part 21 Supply port 22 Rotating shaft 23 Timing belt 24 Pulley 25 Cone 26 Suction duct 27 Suction port 31 Exhaust Exit 32 Powder / particles transfer part 33 Optical sensor part

Claims (3)

A supply port having a supply port at the lower end, and supplying the granular material downward from above;
A concave rotating container that is rotatably provided around a vertical axis, and that moves the granular material supplied from the supply unit to the larger diameter side by centrifugal force;
A suction part having a suction port at a close position above the inner peripheral surface of the rotating container;
A recovery unit that has a shape surrounding the uppermost edge of the rotating container and is formed so as to be receivable with respect to the granular material discharged to the outside beyond the uppermost edge of the rotating container by centrifugal force. An apparatus for removing foreign matter having a small specific gravity in a granular material.   A light projecting unit for irradiating the powder on the rotating container with light, a light receiving unit for receiving light that has passed through the powder from the light projecting unit, and converting the light into an electrical signal, and a powder from the electrical signal 2. The small specific gravity foreign substance removing apparatus according to claim 1, further comprising an optical sensor unit for monitoring whether or not small specific gravity foreign substances including hair and fibers are mixed therein. A light projecting unit for irradiating the powder on the rotating container with light, a light receiving unit for receiving light passing through the powder from the light projecting unit, and converting the light into an electrical signal, and a powder from the electrical signal It is determined whether or not a small specific gravity foreign matter including hair and fibers is mixed therein, and when the small specific gravity foreign matter is mixed, an optical sensor unit for operating the suction unit is provided. Item 2. A small specific gravity foreign matter removing apparatus for a granular material according to Item 1.

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