JP6413808B2 - Powder input device - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a powder input device represented by a chute provided in the course of a powder particle conveyance process, a hopper or a tank for storing powder particles. More specifically, the present invention relates to a granular material charging device that suppresses clogging in the vicinity of the discharge port of the granular material by a bridge.

  In facilities that handle powder and granular materials, when transporting powder to any location, the powder is temporarily stored in a powder input device such as a hopper or tank, In general, it is transported from a granule feeding device to a target location using a transport pipe or a conveyor. In addition, when there is a difference in height between the two conveyors, a granular material charging device may be used so that the granular material appropriately falls to the target point. In any of the granular material charging devices, an inclined portion is formed in the vicinity of the granular material outlet so as to decrease the cross-sectional area from above to below.

  In such a granular material charging device, if a granular material having a small particle size and containing a large amount of moisture and oil is used, friction between the granular materials increases, and the gap between the opposing inner surfaces of the inclined portion is increased. A phenomenon that a bridge is formed on the surface and cutting out becomes impossible.

  On the other hand, methods for breaking the bridge formed near the discharge port have been proposed. Specifically, a knocker is installed on the inclined part and the bridge is broken by physical impact, a nozzle that blows gas on the side of the inclined part and a bridge is broken by the gas flow (Patent Document 1), or There is a method in which a porous plate for introducing gas is provided on the side surface of the part, and the powder is fluidized to break the bridge.

  Also, in Patent Document 2, a flexible container made of rubber or the like is attached to the inside of the outer wall of the inclined portion, and the flexible container is deformed by air pressure by intermittently applying and removing air pressure to the container, thereby creating a bridge or the like. A technique for breaking down is disclosed.

  Further, Patent Document 3 discloses a technique in which a part of a flexible liner lined on an inclined portion is periodically moved inside a hopper.

JP 2007-297204 A JP 2001-39489 A JP 2003-54684 A

  However, in the case of a device using a knocker, there is a problem that the bridge does not collapse even when a physical impact is applied depending on the hardness and friction coefficient of the particles, and in some cases, it becomes a compacted state and it becomes difficult to discharge the granular material.

  Moreover, in the apparatus of Patent Document 1, it is difficult to break the bridge unless the gas flow rate is set to a certain level. On the other hand, when trying to secure the flow rate, excessive gas is introduced, and there is a problem that the efficiency of conveyance is lowered.

  Moreover, in the apparatus of patent document 2, there existed a problem that a flexible container exists in a hopper, and when a flexible container is damaged, a granular material will be clogged and the effort of replacement will take remarkably. Furthermore, when air pressure is applied to the flexible material, there is a problem that the air pressure escapes depending on the shape of the bridge and the like, and often does not contribute effectively to the destruction of the bridge.

  In addition, the apparatus of Patent Document 3 has a complicated structure and takes a lot of maintenance, and in the case of a small granular material having an average particle size of 1 mm or less, the granular material is clogged in the gaps of the movable parts. There was a problem that it became difficult to discharge.

  The present invention has been made in order to solve the above-described problems, and in the granular material charging apparatus, the bridge formed in the vicinity of the discharge port is surely broken to suppress clogging of the granular material. With the goal.

The present invention for solving the aforementioned problems is a granular material feeder comprising a wall that the supply port and outlet granular material is discharged to granule is supplied is formed, the wall is , An iron plate portion that is a portion formed of an iron plate, and an inclined portion that is inclined so that a cross-sectional area decreases from above to below, at least a part of the inclined portion being formed of a flexible material A gas supply that is a flexible portion, and includes a gas ejector that ejects gas toward the inner surface of the flexible portion, and the gas ejector is connected to the iron plate portion and serves as a gas flow path It is characterized by having a tube .

  According to the granular material charging device according to the present invention, a gap can be generated between the flexible portion and the bridge by expanding the flexible portion outward. Thereby, the bridge formed in the vicinity of the discharge port can be surely destroyed, and clogging of the granular material can be suppressed.

It is a figure which shows schematic structure of the granular material injection | throwing-in apparatus which concerns on embodiment of this invention. In the granular material injection device concerning the embodiment of the present invention, it is a schematic longitudinal section showing the state where a bridge was formed. It is a figure which shows the state which the inclination part expanded in the granular material injection | throwing-in apparatus which concerns on embodiment of this invention. In addition, the dashed-two dotted line in a figure has shown the shape of the inclination part before expansion | swelling. It is a schematic longitudinal cross-sectional view which shows the state which the inclination part of the granular material injection | throwing-in apparatus which concerns on embodiment of this invention expanded. It is a longitudinal cross-sectional view which shows schematic structure of the granular material injection | throwing-in apparatus which concerns on another embodiment of this invention.

  Hereinafter, a granular material charging device according to an embodiment of the present invention will be described with reference to the drawings. In the present specification and drawings, elements having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 1, the granular material injection | throwing-in apparatus 1 which concerns on this embodiment is provided with the wall body 4 in which the supply port 2 which supplies a granular material, and the discharge port 3 which discharges a granular material were formed. . The wall body 4 is formed in a square cross section, and the upper portion 4a of the wall body 4 is formed of an iron plate.

  Further, the wall 4 is formed with an inclined portion (inclined portion 4b) so that the cross-sectional area decreases from the upper side to the lower side. The inclined portion 4b is formed of a flexible material made of rubber or the like. The inclined portion 4b is not covered with an outer wall member such as an iron plate, and is configured to be expandable outward.

  The granular material charging device 1 also includes a plurality of gas ejectors 5 for ejecting compressed gas. Each gas ejector 5 includes a gas tank 6 filled with a gas such as air at a high pressure. Connected to the gas tank 6 is a gas supply pipe 7 serving as a flow path for the filled gas. Each gas supply pipe 7 is attached to each surface of the rectangular wall body 4 so as to penetrate the iron plate of the wall upper part 4a. An ejection nozzle 8 that ejects gas is provided at the tip of the gas supply pipe 7, and an ejection port (not shown) of the ejection nozzle 8 faces downward.

  The granular material charging device 1 according to the present embodiment is configured as described above. When this granular material charging device 1 is used, a bridge may be formed in the vicinity of the outlet as shown in FIG. In such a case, compressed gas is ejected from the gas ejector 5 as shown in FIG. The jet pressure of the compressed gas is set to a jet pressure at which the inclined portion 4b expands outward based on the properties of the flexible material and the wall shape. Thereby, the jetted compressed gas hits the inclined portion 4b, and the inclined portion 4b formed of a flexible material expands outward.

  As a result, as shown in FIG. 4, a gap S is formed between the granular material (dashed line portion) at the time of bridge formation and the inner surface of the inclined portion. And when each particle | grain flows into the newly produced clearance gap S, the balance state of the force between each particle | grain at the time of bridge formation will collapse, and a bridge will be destroyed. Thereby, clogging of the granular material is eliminated, and the granular material is smoothly charged from the discharge port 3.

  As described above, in the granular material charging device 1 according to the present embodiment, the inclined portion 4b of the wall body 4 is formed of a flexible material, and the inclined portion 4b can be expanded outward. Due to the configuration, the bridge can be easily broken without providing a complicated mechanism or the like.

  Moreover, like the granular material charging device 1 according to the present embodiment, by expanding the inclined portion 4b to the outside, the granular material accumulated so as to stretch between the opposing inner surfaces of the inclined portion 4b is dropped all at once. Can be made. For this reason, the bridge formed in the vicinity of the discharge port can be reliably destroyed.

  Further, by not covering the outside of the portion (flexible portion) formed of a flexible material with an outer wall member such as an iron plate, the flexible portion can be replaced while avoiding removal of other parts as much as possible. Thereby, even if a flexible part is damaged by repeated use of the granular material throwing-in apparatus 1, member replacement | exchange can be performed in a short time and maintenance property can be improved. Moreover, since it is possible to shorten the time until the granular material transport facility is restarted, productivity can be improved.

  The inventor of the present application conducted an experiment in which an impact was physically applied from the outside of the inclined portion 4b with an air hammer or the like instead of blowing compressed gas into the inner surface of the inclined portion. It was limited and the bridge could not be destroyed.

  As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to this example. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to.

  For example, in the said embodiment, although the cross-sectional shape of the wall body 4 was made into the square shape, the shape of the wall body 4 is not limited to this. Moreover, the upper part 4a of the wall 4 may not be an iron plate. Moreover, the kind of gas ejected toward the inclined portion inner surface is not particularly limited. However, it is preferable to use compressed air in order to reduce the running cost while obtaining a sufficient effect. The gas ejection timing does not have to be after the bridge formation as described in the above embodiment, and the gas may be intermittently ejected before the bridge formation.

  Moreover, in the said embodiment, although it decided to form the whole inclination part 4b with a flexible material, you may decide to form only a part of inclination part 4b with a flexible material. For example, in consideration of the properties of the granular material and the wall shape of the granular material charging device 1, only the portion where the bridge is easily formed may be formed of a flexible material. Even if it is such a structure, if the granular material injection | throwing-in apparatus is comprised so that the part (flexible part) formed with the flexible material among the inclination parts 4b may be expanded outside, the above-mentioned The bridge can be destroyed as described in the embodiment.

  However, it is possible to reliably break the bridge if the entire inclined portion 4b is a flexible portion regardless of the properties of the granular material or the shape of the wall. For example, even if the position where the bridge is likely to be formed is changed when powders having different properties are used, if the entire inclined portion 4b is a flexible portion, the entire inclined portion 4b expands outward. Thereby, since the clearance gap S can be produced between the inner surface of the inclination part 4b and the granular material G irrespective of the formation position of a bridge, a bridge can be destroyed reliably. That is, the versatility of the granular material charging device can be improved by forming the entire inclined portion 4b from a flexible material.

  Moreover, the direction which comprised the inclination part 4b whole with a flexible part becomes easy to enlarge the bending amount of a flexible part. For example, comparing the case where the gas ejection pressure is the same and a portion of the inclined portion 4b is a flexible portion and a case where the entire inclined portion 4b is a flexible portion, the entire inclined portion 4b is a flexible portion. This increases the amount of bending of the flexible portion. That is, in the configuration in which the entire inclined portion 4b is a flexible portion, the gap S generated between the granular material and the inner surface of the flexible portion is easily increased. For this reason, a bridge can be destroyed more reliably.

  Moreover, in the said embodiment, although the gas ejector 5 was used as a flexible part deformation | transformation mechanism which expands a flexible part, a flexible part deformation | transformation mechanism is not limited to this. For example, as shown in FIG. 5, it is good also as a structure which attaches the cylinder 9 to the outer surface side of the inclination part 4b, and pulls the inclination part 4b from the outer side of the inclination part 4b. Even if it is this structure, the clearance gap S can be produced between the inclination part 4b and the granular material G, and a bridge | bridging can be destroyed. However, by using the gas ejector 5, the structure of the apparatus can be simplified, and the costs associated with apparatus introduction and maintenance can be suppressed.

  Moreover, the granular material injection | throwing-in apparatus which concerns on this invention can eliminate not only the clogging of the granular material resulting from a bridge | bridging but also the clogging of the granular material resulting from a rat hole etc.

  In the equipment (dust recycling equipment) for kneading dust and sludge, which are by-products of the iron making process, and regenerating as iron making raw material pellets, the powder input device according to the present invention is applied as the discharge ore sloping part on the kneader exit side, The effect by this invention was verified.

  The wall shape of the granular material charging device according to the present embodiment has a rectangular cross section, the dimensions of the upper wall body serving as the inlet side of the granular material are 450 mm long, 1110 mm wide, and the outlet side of the granular material. The dimensions of the lower part of the wall body are 380 mm long and 720 mm wide. The total length of the wall body is 1400 mm, and an inclined portion is provided from the upper part of the wall body toward the lower part of the wall body. The upper part of the wall body is formed of an iron plate, and the entire inclined part is formed of a flexible material. The thickness of the inclined portion is 16 mm.

  Further, a gas ejector for ejecting compressed air is provided at the upper portion of the wall body, and a gas supply pipe serving as a gas flow path is provided so as to penetrate the upper portion of the wall body. An ejection nozzle is provided at the tip of the gas supply pipe, and the ejection port faces downward.

The granular material conveyed in the conveyance process of this example has a bulk density of 1600 kg / m ³ , a volume average particle size of 1 mm or less, contains 10% of water, and is conveyed at a mass rate of 11.1 kg / s. Is done.

  In this example, compressed air having a pressure of 0.6 MPa was ejected toward the inclined portion every 8 hours of operation of the transfer process. As a result, there was no clogging of the ore sloping portion that occurred about four times a month on average in the powder structure charging device of the conventional structure. That is, according to the granular material charging device according to the present invention, it is possible to greatly suppress clogging of the granular material in the vicinity of the discharge port as compared with the conventional granular material charging device.

  In particular, the granular material charging device according to the present invention has a more remarkable effect when used in the transport process as in the present embodiment. Considering the conditions of the transfer process of the present embodiment, it is assumed that the same remarkable effect can be obtained even in the transfer process conditions generally used in the dust recycling facility.

That is, a conveying process for conveying a granular material having a bulk density of 1000 kg / m ³ or more, a volume average particle diameter of 1 mm or less, and a moisture content of 7% to 15% at a mass rate of 0.3 kg / s to 30 kg / s. By using the granular material charging device according to the present invention, the effect of suppressing clogging of the granular material is increased.

  Moreover, in the conveyance process, it is preferable that the thickness of an inclination part is 5 mm or more and 25 mm or less. According to the experiment of the present inventor, when the thickness of the inclined portion is less than 5 mm, the durability is not sufficient and the replacement frequency of the inclined portion is increased. On the other hand, if the thickness of the inclined portion exceeds 25 mm, the expansion allowance cannot be secured sufficiently, and the number of times the inclined portion expands and contracts is increased in order to destroy the bridge.

  The present invention can be applied to a process for conveying a granular material.

DESCRIPTION OF SYMBOLS 1 Powder body injection | throwing-in apparatus 2 Supply port 3 Discharge port 4 Wall body 4a Wall body upper part 4b Inclination part 5 Gas ejector 6 Gas tank 7 Gas supply pipe 8 Injection nozzle 9 Cylinder G Granule body S Gap

Claims (4)

A granular material charging device provided with a wall body in which a supply port to which granular material is supplied and a discharge port from which granular material is discharged is formed,
The wall body has a iron plate portion which is a portion formed of a steel plate, an inclined portion which is the cross-sectional area toward the top downwards inclined so as to decrease,
At least a part of the inclined part is a flexible part made of a flexible material,
A gas ejector for ejecting gas toward the inner surface of the flexible portion;
The said gas ejector is a granular material injection | throwing-in apparatus which has the gas supply pipe | tube used as the flow path of the said gas connected to the said iron plate part . The granular material injection device according to claim 1, wherein the entire inclined portion is the flexible portion. Used in a transport process for transporting powder particles having a bulk density of 1000 kg / m ³ or more, a volume average particle size of 1 mm or less, and a moisture content of 7% to 15% at a mass rate of 0.3 kg / s to 30 kg / s. The granular material injection | throwing-in apparatus of Claim 1 or 2 used. The granular material injection | throwing-in apparatus of Claim 3 whose thickness of the said flexible part is 5 mm or more and 25 mm or less.

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