JP2010167376A - Foreign matter removing elbow pipe in air flow conveyance piping - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a foreign matter removing elbow pipe capable of easily and efficiently separating and removing a foreign matter from conveyable matters through air flow conveyance piping, in a flow of matters conveyed with air flow. <P>SOLUTION: The foreign matter removing elbow pipe 10 is installed in a curved corner 12 of air flow conveyance piping 11 changing a conveying direction from a lateral direction to a vertical direction, and removes foreign matters 17 having specific gravity larger than conveyed matters in conveyance. The elbow pipe 10 is composed of an accumulating recess 14 that is arranged opposite to a conveyance direction X by lateral piping 13 downstream and that is formed projectingly from the curved corner 12 in a lateral direction externally, and of a collecting recess 15 that is interposed between the lateral piping 13 and the accumulating recess 14 and that is installed projectingly from the curved corner 12 downward externally. Conveyed matters flowing in the lateral piping 13 by air flow conveyance are collected, while rotated through the accumulating rotary recess 14 and delivered upward, by dropping foreign matters 17 with a large specific gravity to the collecting recess 15 during the rotation. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a foreign matter removing elbow pipe in an airflow conveying pipe, and in particular, a foreign matter removing elbow in an airflow conveying pipe that is provided at a curved corner portion of the airflow conveying pipe and removes a foreign substance having a large specific gravity from a conveyed article. Regarding the tube.

  In recent years, since the amount of industrial waste and other wastes has been increasing year by year, there is a growing tendency to use these wastes effectively. For example, in the case of waste plastics and construction waste wood, etc., after being crushed finely by a crushing device etc. as needed, after being transported to a reuse facility on the downstream side by various conveying devices and processed, It will be reused as fuel for power generation, fuel for cement production, etc.

  When reusing these wastes, for example, waste plastics, construction waste wood, etc. often contain foreign objects such as nails, bolts and nuts, and non-ferrous metals, gravel, etc. If waste is transported to the downstream side with foreign matter mixed in, for example, in a reuse facility, the teeth of the crushing device may be lost, the transport piping may be blocked, or other equipment may be damaged. There is a risk of causing damage or the like and adversely affecting the operation of the reuse facility.

  On the other hand, when conveying plastic waste, shredder dust of vehicle parts, etc., an apparatus has been developed that sorts these wastes into heavy and light by wind sorting (for example, patents). Reference 1 and Patent Reference 2).

JP 2002-177890 A JP-A-11-207263 JP 58-500910 A JP-A-3-244895

  However, the wind power sorting apparatus disclosed in Patent Document 1 blows away the waste discharged and dropped into the air by an air flow from an air flow jet nozzle, and sorts the waste according to the fall distance. The wind power sorter has a staggered baffle arranged in the cavity of the sorter body, and separates waste through a zigzag flow of air. This requires a large facility such as a sorter body, which increases the cost and requires a lot of installation space.

  On the other hand, for example, as a device that can easily and efficiently transport fluid materials such as granular materials, air is generated by sending air into the pipe, or by creating negative pressure by sucking the pipe. Thus, there is known an airflow conveyance pipe for conveying a fluid material along with these airflows (see, for example, Patent Document 3 and Patent Document 4). Moreover, in the airflow conveyance piping of patent document 3 and patent document 4, when changing the flow of the airflow containing a conveyed product from the horizontal direction to the vertical direction, for example, the direction is changed through a curved corner portion with a small curvature. In addition, when the flow of the airflow changes direction with a small curvature, it is possible to effectively prevent the conveyed object from colliding with the inner wall surface of the pipe at the curved corner portion and wearing the inner wall surface. The device is made.

  The present invention provides a nail, a bolt having a large specific gravity easily and efficiently in a flow of a transported material that is transported together with an air current by an air flow transport pipe from a transported material such as a waste that can be transported via the air flow transport pipe. It is an object of the present invention to provide a foreign substance removing elbow pipe in an air flow conveying pipe capable of separating and removing foreign substances such as nuts, non-ferrous metals and gravel.

  The present invention is provided in a curved corner portion that changes a conveyance direction from a horizontal direction to a vertical direction in an air flow conveyance pipe that conveys a conveyance item by an air current, and the conveyance item is conveyed from the conveyance item conveyed along the curved corner portion. A foreign matter removing elbow pipe for removing foreign matter having a higher specific gravity than the other, and is disposed oppositely in the conveying direction by the downstream side horizontal pipe part, and is formed to protrude laterally outward from the curved corner part. Conveyance which consists of a concave part, a recovery concave part which is interposed between the horizontal pipe part and the reservoir concave part and protrudes downward and outward from the curved corner part, and flows through the horizontal pipe part by air current conveyance While sending at least the lower layer part of the flow of material toward the upstream vertical piping part through the reservoir recess, foreign matter having a large specific gravity is dropped into the recovery recess during turning and rotated. By providing a foreign matter removing elbow in pneumatic conveying pipe which is obtained by achieving the above object.

  And in the foreign substance removal elbow pipe | tube in the airflow conveyance piping of this invention, it is preferable that the said accumulation recessed part is provided with the inner wall surface shape which curves in circular arc shape or spherical shape.

  Further, in the foreign substance removing elbow pipe in the airflow conveying pipe of the present invention, the recovery recess communicates with an airflow generating means for generating an airflow upward from a lower portion of the recovery recess, and the airflow generating means It is preferable that an air flow having a speed larger than the floating speed of the conveyed object and smaller than the floating speed of the foreign matter is generated in the collecting recess.

  Furthermore, in the foreign substance removal elbow pipe in the airflow conveyance pipe of the present invention, the lower part of the recovery recess is opened and closed while holding the state of transporting the transported object through the curved corner part, and the recovery recess It is preferable that a take-out mechanism capable of taking out the collected foreign matter is provided.

  Furthermore, in the foreign substance removing elbow pipe in the airflow conveying pipe of the present invention, it is preferable that at least the bottom surface of the lateral pipe portion that is close to the recovery recess is formed flat.

  Moreover, in the foreign substance removal elbow pipe in the airflow conveyance pipe of the present invention, it is preferable that a bottom surface of at least a portion of the lateral pipe portion adjacent to the recovery recess is inclined downward toward the recovery recess. .

  Moreover, in the foreign substance removal elbow pipe in the airflow conveyance pipe of the present invention, it is preferable that the conveyed product is waste plastic crushed into particles.

  According to the foreign substance removing elbow pipe in the airflow conveying pipe of the present invention, the flow of the conveyed object that is conveyed along with the airflow by the airflow conveying pipe from the conveyed substance such as the waste that can be conveyed via the airflow conveying pipe is simplified. In addition, the foreign matter can be separated and removed efficiently.

It is sectional drawing explaining the structure of the foreign material removal elbow pipe | tube in the airflow conveyance piping which concerns on preferable one Embodiment of this invention. It is a principal part expansion schematic sectional drawing explaining the structure of the foreign material removal elbow pipe in the airflow conveyance piping which concerns on preferable one Embodiment of this invention. It is an expanded sectional view which illustrates the taking-out mechanism which can take out the foreign material concerning one desirable embodiment of the present invention.

  As shown in FIGS. 1 and 2, the foreign substance removing elbow pipe 10 in the airflow conveyance pipe according to a preferred embodiment of the present invention is, for example, a granular material that is a waste as a conveyance object that can be conveyed through the airflow conveyance pipe 11. When transporting the crushed waste plastic to the curved corner portion 12 of the airflow transport pipe 11, the transported material such as nails, bolts, nuts, non-ferrous metal, gravel, etc. This is employed in order to easily and efficiently separate and remove the foreign matter 17 having a larger specific gravity than the above. The type of airflow is not particularly limited as long as it is a gas, and examples thereof include air in the atmosphere, nitrogen, and carbon dioxide. Of these, air that is inexpensive and easily available is preferably used.

  And the foreign substance removal elbow pipe | tube 10 in the airflow conveyance piping which conveys the conveyed product of this embodiment by an airflow is preferably conveyed from a horizontal direction or a substantially horizontal direction as a horizontal direction, Preferably it is a vertical direction or a substantially vertical direction as a vertical direction. It is a pipe portion that is provided at the curved corner portion 12 of the airflow conveyance pipe 11 that changes the direction and removes the foreign matter 17 having a specific gravity larger than that of the conveyed product from the conveyed product conveyed along the curved corner portion 12. And a concavity 14 formed opposite to the conveying direction X by the downstream lateral pipe section 13 and projecting outward in the lateral direction from the curved corner section 12, and the lateral pipe section 13 and the concavity recess 14 It consists of a recess 15 for recovery that protrudes outwardly from the curved corner portion 12 with an intervening space between them. While turning at least the lower layer portion through the reservoir recess 14 and feeding it toward the upstream longitudinal pipe portion 16, the foreign matter 17 having a large specific gravity is dropped into the recovery recess 15 and collected during turning. (See FIG. 2).

  Further, in the present embodiment, the collection recess 15 communicates with an airflow generation means 18 that generates an upward airflow from the lower portion of the collection recess 15, and the airflow generation means 18 causes the floating speed of the transported object to be conveyed. An air flow that is larger than the floating velocity of the foreign matter 17 is generated in the collecting recess 15.

  Further, in the present embodiment, the foreign matter 17 collected in the collection recess 15 can be taken out at the lower portion of the collection recess 15 while being opened and closed while maintaining the state in which the conveyed product is conveyed via the curved corner portion 12. A take-out mechanism 19 is provided.

  In the present embodiment, the airflow conveying pipe 11 is made of a steel pipe having a circular cross section with an inner diameter φ = 140 mm, for example, except for the portion where the foreign substance removing elbow pipe 10 is provided, with the curved corner portion 12 interposed. The transport direction X is changed from a substantially horizontal lateral direction to a vertical direction substantially perpendicular thereto.

  In the present embodiment, the curved corner portion 12 is provided as a main part of an elbow pipe 23 connected via the joint portion 22 between the upstream linear pipe 20 and the downstream linear pipe 21. The corner portion 12 is curved so as to draw, for example, a quarter-circular arc shape having a radius of curvature R1 of the center line of about 1400 mm, and changes the conveyance direction X of the conveyance object from the horizontal direction to the vertical direction. Yes.

  Here, the radius of curvature R1 of the center line of the curved corner portion 12 is preferably 5 to 10 times, more preferably 8 to 10 times the inner diameter φ of the airflow conveyance pipe 11. By setting the curvature radius R1 of the center line of the curved corner portion 12 to 5 to 10 times the inner diameter φ of the airflow conveying pipe 11, the flow along the curved corner portion 12 of the waste plastic which is the conveyed product is made smooth. It becomes possible to efficiently separate foreign substances by the foreign substance removing elbow pipe 10.

  Further, the upstream side portion of the curved corner portion 12 is a horizontal pipe portion 13 extending in the horizontal direction or substantially horizontal direction, and the reservoir concave portion 14 disposed opposite to the conveyance direction X by the horizontal pipe portion 13. And the collection recess 15 disposed between the pool recess 14 and the downstream end of the horizontal pipe portion 13 are integrated to form the foreign substance removal elbow pipe 10 of the present embodiment. Will be.

  The reservoir concave portion 14 constituting the foreign substance removing elbow pipe 10 has the inner wall surface of the curved corner portion 12 recessed toward the outside so that the opening is opposed to the conveying direction X by the lateral pipe portion 13 and the curved corner portion 12. It is the part which protrudes from the horizontal direction outside. In the present embodiment, the inner surface of the main portion of the reservoir recess 14 is curved in a spherical shape (dome shape) having a curvature radius R2 of, for example, about 91 mm. In addition, the concave concave portion 14 having a spherical inner wall surface is gradually changed in shape toward a lower end portion connected to the recovery concave portion 15 so as to be joined and integrated with the upper end portion of the recovery concave portion 15. It has become. In addition to the spherical shape (dome shape), the reservoir concave portion 14 may have, for example, a shape in which a cylinder is cut in half.

  Since the inner wall surface of the main portion of the reservoir recess 14 is curved in a spherical shape, the conveyed product can be retained to trap foreign matter and wear of the corner portion can be prevented. Moreover, it becomes possible to generate the flow of the conveyed product that changes in direction while collecting and turning in the accumulation recess 14 more smoothly. Note that the inner wall surface of the reservoir recess 14 can be formed to be curved in an arc shape only in the vertical direction without being curved in the lateral direction, and a spherical curved surface can be formed by such an arc-shaped curved surface. In the same manner as described above, it is possible to cause the flow of the conveyed product that changes in direction while swirling in the pool recess 14 to be generated more smoothly. The shape of the reservoir recess 14 is preferably spherical or arcuate. Thereby, substitution of a staying thing is performed easily.

  The recovery concave portion 15 constituting the foreign substance removing elbow pipe 10 is a portion that is provided between the lower end portion of the reservoir concave portion 14 and the downstream end portion of the lateral pipe portion 13 so as to protrude outwardly. In the embodiment, a substantially truncated quadrangular pyramid shape in an inverted state in which the cross-sectional area decreases downward and the bottom surface (upper surface) opens as the recovery opening 15a is provided. The collecting recess 15 is not limited to a quadrangular pyramid shape, but may be any shape that can capture foreign matter.

  In the present embodiment, the recovery recess 15 is provided to protrude downward with a height H of, for example, about 150 mm, and at the lower end portion thereof, for example, through the airflow injection hole 24 formed in the side surface, It communicates with an airflow generation means 18 that generates an upward airflow from the lower part of the recess 15. The airflow generation means 18 is a known airflow supply device such as an air supply blower. For example, by connecting an air supply nozzle to the airflow injection hole 24 and forcibly sending the airflow, as will be described later, It is possible to generate an airflow that flows upward from the lower portion of the collection recess 15 at a speed that is higher than the speed and lower than the floating speed of the foreign matter 17.

  In the present embodiment, a take-out mechanism 19 for taking out the foreign matter 17 collected in the collection recess 15 is provided below the collection recess 15. The take-out mechanism 19 preferably needs to be able to take out the foreign matter 17 while keeping the state in which the conveyed product is being conveyed through the curved corner portion 12 with the peripheral surface of the curved corner portion 12 being sealed. is there. Such a take-out mechanism 19 includes, for example, a collection chamber 26 sandwiched between an inner opening / closing lid 25a and an outer opening / closing lid 25b. The outer opening / closing lid 25b is closed and the inner opening / closing lid 25a is opened. After the foreign matter 17 collected in the recess 15 is dropped into the collection chamber 26, the inner opening / closing lid 25a is closed and the outer opening / closing lid 25b is opened so that the foreign matter 17 can be taken out from the collection chamber 26. Can be used.

  Further, as another take-out mechanism 19 that allows the foreign matter 17 to be taken out while maintaining the state in which the conveyed product is being conveyed through the curved corner portion 12, for example, a double flap damper type take-out mechanism as shown in FIG. Can be mentioned. The double flap damper system refers to a discharge device that secures airtightness by installing flap dampers 31 and 32 that perform gravity discharge in two upper and lower stages across a space and alternately opening and closing.

  Here, in order to take out a foreign substance using the double flap dampers 31 and 32, specifically, first, it is confirmed that the flap dampers 31 and 32 are closed. Next, an appropriate amount of foreign matter is filled in the receiving box 33. At this time, it is preferable that gas is supplied from the airflow valve 38 to the receiving box 33, and an airflow is generated in the box 33 from the lower part to the upper part. Thereby, a conveyed product can be always flowed and can be smoothly sent to a lower stage. Thereafter, the pressure equalizing valve 34 is opened so that the pressure in the receiving box 33 and the intermediate box 35 is the same. Next, the upper flap 31 is opened, the foreign matter is moved to the intermediate box 35, and the upper flap 31 is closed. After confirming that the upper flap 31 is closed, the pressure equalizing valve 34 is closed, the atmospheric valve 36 is opened, and the intermediate box 35 is set to atmospheric pressure. Thereafter, the lower flap 32 is opened and the foreign matter is discharged into the discharge box 37. After confirming that the intermediate box 35 is emptied, the lower flap 32 is closed and the atmospheric valve 36 is also closed. Confirm that the lower flap 32 is closed. Thereafter, the foreign matter can be taken out by repeating the above-described operation.

  Furthermore, in the present embodiment, at least the downstream portion of the lateral piping portion 13 connected to one side portion of the recovery opening 15a that is a quadrangular shape of the inverted concave collecting portion 15 having a truncated truncated pyramid shape is used for recovery. The bottom surface of the portion 13a adjacent to the recess 15 is formed flat. As a result, the transverse cross-sectional shape of the airflow conveying pipe 11 of at least the portion 13a adjacent to the recovery recess 15 is provided with a hollow, generally inverted U shape with the bottom portion closed. Since the bottom surface of at least the portion 13a adjacent to the collecting recess 15 of the horizontal piping portion 13 is formed flat, foreign matter flows along the bottom of the horizontal piping portion 13 by airflow conveyance as will be described later. By moving 17 along a flat bottom surface having a considerable width while decreasing the speed, it is possible to smoothly drop it into the collection recess 15 and reliably collect it.

  Furthermore, in the present embodiment, at least the bottom surface of the portion 13a adjacent to the recovery recess 15 of the horizontal pipe portion 13 is inclined downward at an angle θ of, for example, about 3 ° toward the recovery recess 15. The bottom surface of at least the portion 13a adjacent to the recovery recess 15 of the horizontal pipe portion 13 is inclined downward toward the recovery recess 15 so that along the bottom of the horizontal pipe portion 13 by the air flow transfer together with the conveyed product. As the foreign matter 17 flowing in this direction moves toward the recovery recess 15, it can be easily separated downward from the flow of the conveyed product.

  And according to the foreign substance removal elbow pipe 10 in the airflow conveyance pipe of the present embodiment having the above-described configuration, a conveyed product (waste that is crushed into granules) is conveyed through the airflow conveyance pipe 11 by the following action. In the flow of the plastic), the foreign matter 17 having a specific gravity larger than that of a transported object such as a nail, a bolt, a nut, a non-ferrous metal, and gravel can be separated and removed easily and efficiently.

  That is, in this embodiment, as shown in FIG. 2, for example, at least the lower layer portion of the flow of the transported object including the foreign matter 17 flowing through the horizontal pipe portion 13 by airflow transport, preferably in the transport direction X while reducing the flow velocity. Enters the recess swivel recess 14 that is disposed oppositely, and descends while swirling downward inside the swirl recess recess 14, enters the recovery recess 15, and further swivels upward after being lowered. Then, the air flows in the upper layer part that flows directly from the horizontal pipe part 13 toward the vertical pipe part 16 and the flow of the conveyed product, and flows smoothly to the vertical pipe part 16 by the air current conveyance together with these. . On the other hand, the foreign matter 17 having a specific gravity greater than that of the waste plastic contained in the conveyed product cannot be changed in the upward movement direction by the collection recess 15 due to its weight, and is dropped and collected in the collection recess 15 as it is. It will be. The collected foreign matter 17 is taken out from the collecting recess 15 via the take-out mechanism 19 and removed.

  That is, according to the foreign substance removal elbow pipe 10 of the present embodiment, the transported object that can be transported through the airflow transport pipe 11 can be easily and It becomes possible to efficiently separate and remove 17 foreign substances.

  Further, according to the foreign matter removing elbow pipe 10 of the present embodiment, the recovery recess 15 communicates with the airflow generating means 18 that generates an airflow upward from the lower portion thereof. By generating an air flow in the collection recess 15 that is larger than the floating speed of the conveyed object and smaller than the floating speed of the foreign object 17, the recovery is performed while maintaining the function of separating the foreign substance 17 contained in the conveyed object. It is possible to effectively prevent the conveyed product from staying in the collecting concave portion 14 and the collecting concave portion 15 by assisting the conveyed product that has entered the concave portion 15 to be swung upward and pushed out. . Even if the conveyed product stays in the pool recess 14 or the collecting recess 15, the collecting of the collected material is temporarily stopped by the air flow generating means 18 while temporarily stopping the conveyance of the conveyed product and allowing only the air flow to flow through the air flow conveying pipe 11. By generating an airflow in 15, it is possible to remove only the foreign matter 17 from the collection recess 15 by pushing out and removing the staying conveyed product into the flow of the airflow passing through the curved corner portion 12.

  Further, in the present embodiment, for example, a part of the foreign matter 17 flowing along the bottom portion of the horizontal pipe portion 13 by airflow conveyance is pushed in the horizontal direction so as to be pushed by the conveyance object (waste plastic crushed into granules). Although it is considered that the bottom part of the pipe part 13 is slid onto the collecting concave part 15 as it is slid, it is considered that in this embodiment, as described above, at least the collecting concave part 15 of the lateral pipe part 13 and Since the bottom surface of the adjacent portion 13a is formed flat and is inclined downward toward the recovery recess 15, the foreign matter 17 flowing along the bottom of the lateral pipe portion 13 is recovered more efficiently. It becomes possible to do.

  Furthermore, according to the present embodiment, since the flow of the conveyed product that changes in direction while swirling in the reservoir recess 14 and the recovery recess 15 is formed, the flow of the conveyed product is cushioned. As a result, it is possible to effectively prevent the wear of the inner wall surface of the curved corner portion 12 due to the collision of the conveyed object moving in the conveying direction X.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, a transported object containing foreign matter transported via an airflow transport pipe need not be waste plastic, and can be transported via other waste such as crushed wood waste or an airflow transport pipe other than waste. Various kinds of conveyed products may be used. In addition, the reservoir recess does not necessarily have an inner wall surface shape that is curved in an arc shape or a spherical shape, and may have other various inner wall surface shapes. Furthermore, the airflow conveyance pipe provided with the foreign substance removal elbow pipe does not necessarily need to be made of a steel pipe having a circular cross section, and has a function of smoothly changing the conveyance direction from the horizontal direction to the vertical direction via the curved corner portion. Any other various cross-sectional shapes and materials may be used as long as they have.

  Hereinafter, although the foreign material removal elbow pipe | tube in the airflow conveyance piping of this invention is demonstrated still in detail by Example 1, 2, this invention is not limited to these.

[Example 1]
As waste plastic, 5 kg of film-like crushed material with a side of 20 mm or less was used. As foreign materials, stainless steel M6 hexagon nut, stainless steel M12 hexagon nut, stainless steel M6 x 20 mm long hexagon bolt, particle diameter 10 mm gravel, iron diameter 1.5 mm x 19 mm long nails Four pieces were mixed. Here, M6 and M12 are names defined in Japanese Industrial Standard (JIS) B0101.

  As the foreign substance removing elbow pipe, a foreign substance removing elbow pipe having the same configuration as that of the above embodiment as shown in FIG. 1 was used. The foreign substance removing elbow tube was made of a transparent vinyl chloride resin in order to visually confirm the air flow in the elbow pipe and the state of removing the foreign substance. The inner diameter of the airflow conveying pipe was 105 mm, and the radius of curvature of the center line of the curved corner was 1400 mm. The main inner wall surface of the reservoir recess was spherical with a radius of curvature of 91 mm. The collection recess was 118 mm wide, 132 mm deep, and 100 mm high. Waste plastic containing foreign material was supplied to the foreign material removal elbow pipe together with 20m / s air by a rotary feeder. The amount of waste plastic containing foreign matter was 536 kg / hour. In Example 1, no airflow was supplied from the lower part of the recovery recess.

  As a result, all of the M6 hexagon nut, M12 hexagon nut, M6 x 20 mm long hexagon bolt, gravel with a particle diameter of 10 mm and one nail with a diameter of 1.5 mm x length of 19 mm remained in the recovery recess. As a result, it has become clear that foreign matters can be removed by using the foreign matter removing elbow pipe of the present invention.

[Example 2]
The test was performed in the same manner as in Example 1 except that air was supplied upward from the lower portion of the recovery recess. The air flow was supplied from a gap of 132 mm × 3.2 mm × 2 places on one side provided in the lowermost flange portion of the recess for collection. The amount of air supplied from the lower part of the recovery recess is about 0.03 m ³ / s, the area of the air supply part is 7.55 × 10 ⁻⁴ m ² , and the initial flow velocity of the air supply air flow from the lower part Was about 34 m / s.

  As a result, in the first embodiment, the recovery concave portion was almost filled with the waste plastic, but in Example 2, the waste plastic staying in the recovery concave portion was removed by the air from the lower portion, and it was possible to recover only the foreign matter. Furthermore, the collected foreign objects are M6 hexagon nut, M12 hexagon nut, M6 x 20mm long hexagon bolt, gravel with particle diameter of 10mm and two nails of 1.5mm diameter x 19mm length. The effect of removing foreign matter was recognized. As a result, it has become clear that foreign matters can be removed by using the foreign matter removing elbow pipe of the present invention.

  According to the foreign substance removing elbow pipe in the airflow conveying pipe of the present invention, the flow of the conveyed object that is conveyed along with the airflow by the airflow conveying pipe from the conveyed substance such as the waste that can be conveyed via the airflow conveying pipe is simplified. In addition, the foreign matter can be separated and removed efficiently.

DESCRIPTION OF SYMBOLS 10 Foreign substance removal elbow pipe in airflow conveyance piping 11 Airflow conveyance piping 12 Curved corner part 13 Horizontal piping part 13a The part adjacent to the recessed part for collection | recovery of a horizontal piping part 14 Recessed recessed recessed part 15 Recessing recessed part 16 Vertical direction piping part 17 Conveyance Foreign matter 18 having larger specific gravity than the object Airflow generating means 19 Extraction mechanism 23 Elbow piping 24 Airflow injection hole 25a Inner opening / closing lid 25b Inner opening / closing lid 26 Collection chamber 27 Double flap damper X Transporting direction of transported object

Claims (7)

Provided at a curved corner portion that changes the conveying direction from the horizontal direction to the vertical direction in the air flow conveying pipe that conveys the conveyed item by an air flow, and the specific gravity from the conveyed item conveyed along the curved corner portion is higher than that of the conveyed item. A foreign matter removal elbow tube for removing large foreign matter,
A reservoir recess formed opposite to the conveying direction of the downstream lateral piping section and formed to protrude laterally outward from the curved corner section;
It consists of a recess for collection provided between the lateral pipe portion and the reservoir recess and projecting downward and outward from the curved corner portion,
While sending at least the lower layer part of the flow of the transported material flowing through the horizontal pipe part by air flow conveyance toward the upstream vertical pipe part through the reservoir concave part, foreign matter having a large specific gravity is dropped into the recovery concave part. Foreign material removal elbow pipe in the airflow transfer pipe to be collected. The foreign matter removing elbow pipe in the airflow conveying pipe according to claim 1, wherein the reservoir concave part has an inner wall shape curved in an arc shape or a spherical shape. The collecting recess communicates with an airflow generating means for generating an upward airflow from the lower portion of the collecting recess, and the airflow generating means causes the foreign matter floating speed to be greater than the floating speed of the conveyed product. The foreign substance removal elbow pipe in the air current conveying pipe according to claim 1 or 2, wherein an air current having a lower speed is generated in the recess for recovery. At the bottom of the recovery recess, a take-out mechanism is provided that can be opened and closed while holding the transported state through the curved corner, and can take out the foreign matter recovered in the recovery recess. The foreign substance removal elbow pipe in the air current conveying pipe according to claim 1. The foreign substance removal elbow pipe in the airflow conveyance pipe according to any one of claims 1 to 4, wherein a bottom surface of at least a portion of the horizontal pipe section close to the recovery recess is formed flat. The foreign matter removing elbow in the airflow conveying pipe according to any one of claims 1 to 5, wherein a bottom surface of at least a portion of the lateral pipe portion adjacent to the collecting concave portion is inclined downward toward the collecting concave portion. tube. The foreign material removal elbow pipe in the airflow conveyance pipe according to any one of claims 1 to 6, wherein the conveyance object is crushed waste plastic.

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