JP6010197B1 - Multipoint collection apparatus and multipoint collection method - Google Patents

Abstract

[PROBLEMS] To collect objects that are present at multiple points in a wide collection area such as in a tank, in a factory, or in a scaffolding, such as when recovering paint film fragments or abrasives generated by blasting in an oil tank. Are efficiently discharged outside the collection target area and collected. SOLUTION: Provided in the middle of a main flow pipe 10 connecting a collection target area 100 and a collection target outside area 200, a plurality of branch pipes 20 connected at one end to the main flow pipe 10, and a plurality of branch pipes 20. It has an ejector 30 and is configured to generate a swirl flow by inflow from the branch pipe 20 at the junction 40 between the main pipe 10 and the branch pipe 20, and is recovered by the suction force generated by the ejector 30. The objects to be collected existing at multiple points in the target area 100 are sucked from the other ends of the plurality of branch pipes 20 and discharged to the outside of the collection target area 200 via the main flow pipe 10 for recovery. [Selection] Figure 1

Description

  The present invention discharges objects to be collected existing at multiple points in the collection target area to the outside of the collection target area, for example, when collecting a piece of coating film or abrasive material generated by blasting work in an oil tank. It is related with the multipoint collection | recovery apparatus and the multipoint collection | recovery method which collect | recover.

  Conventionally, in order to periodically repaint the inner surface of a tank such as an oil tank, a floor surface cleaner for removing old paint has been used. For example, Patent Document 1 describes an invention relating to a floor surface cleaner that travels while projecting steel grains onto a floor surface by two centrifugal projectors to clean the floor surface. This floor surface cleaner is structurally somewhat complicated and large because it is equipped with a centrifugal projector and a motor. Therefore, the dust collector which collects a coating-film piece and the projected abrasives also becomes large sized, and it becomes the structure which installs a dust collector outside a tank and connects between the floor surface cleaner in a tank with a duct hose. Further, when a plurality of floor surface cleaners are operated simultaneously in a tank, it is necessary to prepare the same number of dust collectors and connect them one-on-one.

  On the other hand, for example, Patent Document 2 describes an invention relating to a compact floor surface cleaner that promotes downsizing of the apparatus. Since this floor surface cleaner is small, the dust collector can also be miniaturized, and the dust collector can be carried into the tank without being installed outside the tank.

  In open blasting work in tanks and bridge scaffolds, a large amount of abrasive material is sprayed and used, and after completion of the work, the abrasive material is collected.

  In addition, cleaning in tanks and factories, and drainage work associated with condensation and rainwater intrusion on open tank floors are also being carried out.

JP-A-5-123969 JP 2002-18716 A

  However, when operating a plurality of large-sized floor surface cleaners described in Patent Document 1 in the tank, it is necessary to introduce a plurality of duct hoses connected to a plurality of dust collectors outside the tank into the tank. There was a problem that the side manhole, which is an entrance for work, was blocked. In addition, a large number of duct hoses crawls around the floor in the tank, which requires a work for moving the duct hoses by human power, resulting in a decrease in work efficiency.

  Moreover, according to the small-sized floor surface sweeper described in patent document 2, since a dust collector can be carried in in a tank and it can construct, workability | operativity improves without blocking a side manhole. However, when multiple units are operated simultaneously in a tank, one dust collector is still required for one floor surface cleaner, and the decrease in the suction capacity of the dust collector is directly affected by the floor surface cleaner. There is a problem that it takes time for maintenance because it leads to a decrease in capacity.

  Also, in open blasting work in tanks and bridge scaffolds, a large amount of abrasive is sprayed and used, requiring a lot of manpower for recovery. In addition, belt conveyors are installed and unloaded, and dedicated vacuum vehicles are used for unloading and collecting, which requires a lot of manpower and cost.

  In addition, a lot of manpower, cost, and construction time are required for cleaning the inside of the tank and the factory, and for the drainage work accompanying the dew condensation and rainwater intrusion on the open tank floor.

  The present invention solves the above-described conventional problems. For example, in the case of recovering coating film pieces or abrasives generated by blasting work in an oil tank, the tank, the factory, the scaffolding, etc. The present invention provides a multipoint recovery apparatus and a multipoint recovery method capable of efficiently discharging and recovering objects to be recovered existing at multiple points in the recovery target area to the outside of the recovery target area.

  In order to solve the above problems, the multipoint recovery apparatus of the present invention is a multipoint recovery apparatus that discharges and recovers objects to be recovered existing at multiple points in the recovery target area to the outside of the recovery target area. A mainstream pipe connecting the inside of the collection target area and the outside of the collection target area, a plurality of branch pipes connected at one end to the main pipe, and an ejector provided in the middle of the plurality of branch pipes, At the junction of the main flow pipe and the branch flow pipe, the upstream main flow pipe is inserted into the downstream main flow pipe to create a gap between the outer surface of the upstream main flow pipe and the inner surface of the downstream main flow pipe. And the branch pipe is connected to open toward the gap in a state of being inclined upstream with respect to the main pipe, and is configured to generate a swirl flow by inflow from the branch pipe. And said Eje By the suction force generated by the gas, the objects to be collected existing at multiple points in the collection target area are sucked from the other ends of the plurality of branch pipes and discharged out of the collection target area through the main flow pipes. And collected.

  Preferably, in the merging portion, the upstream main pipe is tapered toward the downstream side, and the downstream main pipe is tapered toward the downstream side. It is characterized by being.

  Preferably, the ejector generates a swirling flow by introducing compressed air.

  Also preferably, the object to be collected is a granular material.

  The multipoint recovery method of the present invention is a multipoint recovery method for discharging and recovering objects to be recovered existing at multiple points in the recovery target area to the outside of the recovery target area. Connect the outside of the collection target area with a main pipe, connect one end of a plurality of branch pipes to the main pipe, provide an ejector in the middle of the plurality of branch pipes, and at the junction of the main pipe and the branch pipe, The upstream main flow pipe is inserted into the downstream main flow pipe to create a gap between the outer surface of the upstream main flow pipe and the inner surface of the downstream main flow pipe, and the branch pipe is connected to the main flow pipe. Connected to open toward the gap in a state of being inclined toward the upstream side, and configured to generate a swirl flow by inflow from the branch pipe, and the object to be recovered by the suction force generated by the ejector area The object to be recovered which are present in the multi-point was aspirated from the other end of said plurality of branch pipes, and recovering and discharged out of the collecting area of interest via the mainstream pipe.

  Preferably, in the merging portion, the upstream mainstream pipe is tapered toward the downstream side, and the downstream mainstream pipe is tapered toward the downstream side. And

  Preferably, the ejector generates a swirling flow by introducing compressed air.

  Also preferably, the object to be collected is a granular material.

  In the present invention, a main pipe connecting the inside of the collection target area and the outside of the collection target area, a plurality of branch pipes connected at one end to the main pipe, and an ejector provided in the middle of the plurality of branch pipes are provided. ing. In addition, at the junction of the main pipe and the branch pipe, the upstream main pipe is inserted into the downstream main pipe, and a gap is formed between the outer surface of the upstream main pipe and the inner surface of the downstream main pipe. The branch pipe is connected so as to open toward the gap in a state of being inclined upstream with respect to the main pipe, and is configured to generate a swirling flow by inflow from the branch pipe. Then, with the suction force generated by the ejector, the objects to be collected that exist at multiple points in the collection target area are sucked from the other end of the multiple branch pipes and discharged to the outside of the collection target area via the main pipe. It is supposed to be.

  Therefore, first, between the outside of the collection target area and the inside of the collection target area can be simply configured by the arrangement of the mainstream piping. Furthermore, in the area to be collected, it is possible to simply configure by arranging the branch pipes branched from the main pipe so as to spread to a plurality of points (multiple points). As a result, it is possible to prevent a reduction in work efficiency due to complicated piping. Then, it is possible to discharge and collect the objects to be collected existing at multiple points in the collection target area at the same time and in a concentrated manner.

  Further, the suction force for collecting the object to be collected can be realized with a compact system configuration using an ejector. Thereby, even if it is a case where the to-be-collected object which exists in many points within a collection object area is collected, it is not necessary to arrange devices, such as a dust collector which takes time for maintenance.

  Also, at the junction of the main pipe and the branch pipe, the flow from the branch pipe flows into the gap formed between the outer surface of the upstream main pipe and the inner surface of the downstream main pipe. A swirl flow toward the downstream side can be generated while rotating along the donut-shaped gap, and the flow of the main flow pipe can be strengthened.

  In addition, in the confluence portion, when the upstream main flow pipe is tapered toward the downstream side, and the downstream main flow pipe is tapered toward the downstream side, the taper shape is reduced. The flow of the main pipe can be made stronger.

  Further, when the ejector is configured to generate a swirl flow by introducing compressed air, the flow of the branch pipe can be made stronger.

  In addition, when the object to be recovered is a granular material, particularly efficient recovery is possible.

  As described above, according to the present invention, for example, in the case of recovering coating film pieces or abrasives generated by blasting work in an oil tank, multiple points in a wide collection target area such as in a tank, in a factory, or in a scaffold. Can be efficiently discharged out of the collection target area and collected.

It is a whole lineblock diagram showing the multipoint recovery device concerning Embodiment 1 of the present invention. It is sectional drawing which shows an ejector. It is a perspective view which shows the confluence | merging part of main flow piping and a branch flow piping. It is sectional drawing which shows the confluence | merging part of main flow piping and branch flow piping. It is sectional drawing which shows the confluence | merging part of main flow piping and branch flow piping. It is sectional drawing which shows the connection structure of the mainstream piping by a some confluence | merging part. It is a whole block diagram which shows the multipoint collection | recovery apparatus which concerns on Embodiment 2 of this invention.

  Next, a multipoint recovery apparatus and a multipoint recovery method according to an embodiment of the present invention will be described with reference to FIGS. In the following description, “upstream” and “downstream” are defined based on the direction in which the collection object moves, and the direction of the movement source of the collection object is “upstream” and the collection object. The direction of the movement destination is “downstream”.

(Embodiment 1)
FIG. 1 is an overall configuration diagram showing a multipoint recovery apparatus according to Embodiment 1 of the present invention. As shown in FIG. 1, the multipoint recovery apparatus according to Embodiment 1 is an apparatus for recovering an object to be recovered consisting of powder particles such as paint film pieces and abrasives generated by blasting work in an oil tank 1. It is. Here, the inside of the oil tank 1 in which the object to be recovered exists is referred to as a “recovery target area”, and the inside and outside of the oil tank 1 are divided into “inside the recovery target area 100” and “outside the recovery target area 200”. In addition, the blasting work in Embodiment 1 is based on a so-called closed blasting method using a plurality of floor surface cleaners, such as a coating piece or an abrasive generated by the operation of each floor surface cleaner. The powder is recovered. Therefore, the objects to be collected in the first embodiment exist at multiple points in the collection target area 100 according to the traveling positions of the plurality of floor surface sweepers.

  The collection target area 100 and the collection target area 200 are connected by a main pipe 10. One end of the main pipe 10 extends toward the collection target area 100, and the other end of the main pipe 10 passes through a side manhole of the oil tank 1 and passes through a cyclone 9 installed outside the collection target area 200. And connected to the dust collector 3. In addition, it is also possible to perform the separation processing of the object to be collected by connecting the granular material separation processing device disclosed in JP2013-071228A.

  One end of a plurality of branch pipes 20 is connected to the main pipe 10 in the collection target area 100. A connecting portion between the main flow pipe 10 and the branch flow pipe 20 is a junction 40. As described above, the branch pipes 20 branch from the main pipe 10, so that the pipes in the collection target area 100 have an appearance like a fish bone. Details of the junction 40 will be described later. The main pipe 10 and the branch pipe 20 are preferably made of stretchable and flexible members.

  Ejectors 30 are respectively provided in the middle of the plurality of branch pipes 20. An air supply pipe 5 is connected to the ejector 30, and compressed air is supplied from an air compressor 2 installed outside the oil tank 1. The air supply pipe 5 is provided with a plurality of adjustment valves for independently adjusting the air supply to each ejector 30. In the present embodiment, the suction force for collecting the object to be collected is generated from the ejector 30, and the dust collector 3 connected to the end of the main pipe 10 is discharged out of the collection target area 200. It has an auxiliary function for preventing the object to be collected from scattering. Details of the ejector 30 will be described later.

  A floor surface cleaner 4 is connected to the other end of each branch pipe 20. And the to-be-recovered object which consists of granular materials, such as a coating-film piece and an abrasives produced by the operation of the floor surface cleaner 4, is attracted | sucked by the suction force which the ejector 30 generate | occur | produces from the other end of the branch pipe 20. It is discharged and collected outside the collection target area 200 via the pipe 10. The floor surface polishing machine 4 connected to the branch pipe 20 includes a large floor surface cleaning machine disclosed in JP-A-5-123969, and a small floor surface disclosed in JP-A-2002-18716. An abrading machine etc. are mentioned.

  Next, the details of the ejector 30 will be described with reference to FIG. 2A is a cross-sectional front view showing the ejector 30, and FIG. 2B is a cross-sectional perspective view showing the ejector 30.

  The ejector 30 includes a compressed air introduction pipe 31, a suction pipe 32, and a discharge pipe 33. Then, by introducing the compressed air (A) from the compressed air introduction pipe 31, the suction input (B) is generated in the suction pipe 32, and the air containing the collection object is discharged (C) from the discharge pipe 33. It has become. Since the ejector 30 moves with the movement of the branch pipe 20, it is preferable to place the ejector 30 on a wheeled base such as a merging section 40 described later.

  Here, the ejector 30 is preferably configured to generate a swirl flow by introducing the compressed air (A). By generating the swirl flow, the flow of the branch pipe 20 can be made stronger. Although various configurations for generating the swirl flow are possible, in this embodiment, the compressed air introduced from the compressed air introduction pipe 31 is sucked by shifting the mounting position of the compressed air introduction pipe 31 from the center of the suction pipe 32. This is realized by rotating near the end of the pipe 32 and ejecting (D) from the gap formed between the suction pipe 32 and the discharge pipe 33 while maintaining the rotation.

  Next, the details of the junction 40 will be described with reference to FIGS. 3 to 5. FIG. 3 is a perspective view showing a merging portion between the main pipe and the branch pipe, and FIGS. 4 and 5 are cross-sectional views showing the merging portion between the main pipe and the branch pipe.

  As shown in FIG. 3, the junction 40 is placed on the gantry 6. Wheels 7 are provided on the lower surface of the gantry 40 so that they can be moved freely. The junction 40 is configured such that the branch pipe 20 joins the connecting portion of the upstream main pipe 11 and the downstream main pipe 12 constituting the main pipe.

  As shown in FIGS. 4 and 5, the upstream mainstream pipe 11 and the downstream mainstream pipe 12 are connected by inserting the upstream mainstream pipe 11 into the downstream mainstream pipe 12. A gap is formed between the outer surface of the upstream main pipe 11 and the inner surface of the downstream main pipe 12. Furthermore, the branch pipe 20 is directed toward the gap between the outer surface of the upstream main pipe 11 and the inner face of the downstream main pipe 12 with the upstream pipe tilted upstream with respect to the main pipe 10 (11, 12). Connected to open. The attachment angle (α) of the branch pipe 20 with respect to the main pipe 10 (11, 12) can be set to 75 °, for example. Further, the upstream end of the downstream main flow pipe 12 is closed.

  More specifically, the end portion of the main flow pipe 11 is inserted into the enlarged diameter portion formed at the end portion of the main flow pipe 12, and the end portion of the branch flow pipe 20 penetrates the enlarged diameter portion of the main flow pipe 12 to form a gap. It is open toward. And the air containing the to-be-collected object from the branch pipe 20 flows into the main pipe 10. Further, the attachment position (attachment direction) of the branch pipe 20 to the main pipe 12 is configured so that the inflow from the branch pipe 20 does not go to the central point in the radial direction of the main pipe 12. The air to be rotated rotates on the outer surface of the main pipe 11 and is jetted toward the downstream side from a gap formed between the main pipe 11 and the main pipe 12 while maintaining the rotation.

  In the present embodiment, the end portion of the upstream main flow pipe 11 is tapered so as to be tapered toward the downstream side. Further, the downstream main flow pipe 12 is formed so as to be tapered in a taper shape from the upstream enlarged portion toward the downstream side. In this way, by reducing the diameter of the main pipes 11 and 12 toward the downstream side, the flow of the main pipe 10 can be made stronger. However, if a gap can be formed between the outer surface of the main flow pipe 11 and the inner surface of the main flow pipe 12, it is not always necessary to reduce the diameter into a tapered shape.

  With the above configuration, a swirling flow is generated by the inflow from the branch pipe 20 in the merging portion 40. That is, since the flow from the branch pipe 20 flows toward the downstream side into the gap formed between the outer surface of the upstream main pipe 11 and the inner face of the downstream main pipe 12, it rotates along the donut-shaped gap. However, a swirl flow toward the downstream side can be generated. And the flow of the main flow piping 10 can be made stronger by generating a swirl flow. At this time, in the junction 40, an effect as an ejector is generated by the inflow of air from the branch pipe 20.

  Next, the connection structure of the main flow pipe 10 will be described with reference to FIG. FIG. 6 is a cross-sectional view showing a connection structure of the main flow pipe 10 by a plurality of merging portions 4. In FIG. 6, the illustration of the branch pipe 20 is omitted.

  As shown in FIG. 6, the main flow pipe 10 is connected to the main flow pipe 11, the main flow pipe 12, and the main flow pipe 13 from the upstream side (right side in FIG. 6) to the downstream side (left side in FIG. 6) via the junction 40. And main flow pipe 14 are connected in order. Further, the middle of each of the main flow pipes 11, 12, 13, 14 is connected by a connecting pipe 8 having stretchability and flexibility. The main pipes 11, 12, 13, and 14 have a diameter that increases from upstream to downstream. This is because air flows from the branch pipe 20 every time it passes through the junction, and the flow rate of the main pipe 10 increases.

  With the above configuration, the multipoint recovery apparatus according to the first embodiment is generated by the operation of the plurality of floor surface cleaners 4 that exist at multiple points in the recovery target area 100 due to the suction force generated by the ejector 30. An object to be recovered, which is made up of powder particles such as a coating film piece or an abrasive, is sucked from the ends of a plurality of branch pipes 10 and discharged to the outside of the collection target area 200 via the main pipe 10 for recovery. ing.

(Embodiment 2)
FIG. 7 is an overall configuration diagram showing a multipoint recovery apparatus according to Embodiment 2 of the present invention. Similar to the multipoint recovery apparatus according to the first embodiment, the multipoint recovery apparatus according to the second embodiment is an object to be recovered that is made of powder particles such as paint film pieces and abrasives generated by blasting work in the oil tank 1. Is a device for recovering. Hereinafter, the same components as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The blasting work in the second embodiment is based on a so-called open blasting method, and collects powder particles such as paint film pieces and abrasives scattered by injection of abrasives onto the floor surface. Therefore, the objects to be collected in the second embodiment are present at many points in the collection target area 100 in the state of powder particles scattered on the floor surface.

  The collection target area 100 and the collection target area 200 are connected by a main pipe 10. One end of the main flow pipe 10 extends toward the inside of the collection target area 100, and the other end of the main flow pipe 10 passes through a hopper 50 installed outside the collection target area 200 via the side manhole of the oil tank 1. And connected to the dust collector 3. In addition, it is also possible to perform the separation processing of the object to be collected by connecting the granular material separation processing device disclosed in JP2013-071228A.

  A vacuum cleaner head 51 and a floor cleaner 52 are connected to the other end of each branch pipe 20. Then, the ejector 30 removes an object to be collected consisting of powder particles scattered on the floor surface, such as coating particles and abrasives, from the other end of the branch pipe 20 while using the cleaner head 51 and the floor cleaner 52. The suction is generated by the generated suction force, and is discharged and collected outside the collection target area 200 via the main pipe 10. Examples of the floor cleaner 52 connected to the branch pipe 20 include a hand-held floor cleaner disclosed in JP 2012-143422 A.

  With the above configuration, the multipoint recovery apparatus according to the second embodiment is configured from the powder particles such as the coating film pieces and the abrasives collected at multiple points in the recovery target area 100 by the suction force generated by the ejector 30. The to-be-recovered object to be collected is sucked from the end portions of the plurality of branch pipes 10 and discharged through the main pipe 10 to the outside of the collection target area 200 for recovery.

  In the multipoint recovery apparatus and the multipoint recovery method according to the present embodiment, a main pipe 10 connecting the inside 100 of the collection target area and the outside 200 of the collection target area, and a plurality of branch pipes 20 connected at one end to the main pipe 10. And an ejector 30 provided in the middle of the plurality of branch pipes 20. Further, at the junction 40 between the main flow pipe 10 and the branch flow pipe 20, the upstream main flow pipe 11 is inserted into the downstream main flow pipe 12, and the outer surface of the upstream main flow pipe 11 and the downstream main flow pipe 12 are connected. A gap is formed between the inner pipe and the branch pipe 20 is connected to the main pipe 10 (11, 12) so as to open toward the gap in a state of being inclined toward the upstream side. It is configured to generate a swirl flow by inflow. Then, due to the suction force generated by the ejector 30, the objects to be collected existing at multiple points in the collection target area 100 are sucked from the other ends of the plurality of branch pipes 20, and the collection target area outside 200 through the main pipe 10. It is designed to be discharged and collected.

  Therefore, first, between the outside of the collection target area 200 and the inside of the collection target area 100 can be simply configured by the arrangement of the main pipe 10. Further, in the collection target area 100, the tributary pipe 20 branched from the main pipe 10 can be simply configured to be extended to a plurality of points (multiple points). As a result, it is possible to prevent a reduction in work efficiency due to complicated piping. Then, it is possible to discharge and collect the objects to be collected existing at multiple points in the collection target area 100 at the same time and while concentrating.

  Further, the suction force for collecting the object to be collected can be realized by using the ejector 30 with a compact system configuration. Thereby, even if it is a case where the to-be-collected object which exists in many points within the collection object area 100 is collect | recovered, it is not necessary to arrange | position apparatuses, such as a dust collector which takes time for a maintenance, in each point.

  Further, in the junction 40 between the main pipe 10 and the branch pipe 20, the flow from the branch pipe 20 is downstream in the gap formed between the outer surface of the upstream main pipe 11 and the inner surface of the downstream main pipe 12. Therefore, a swirl flow toward the downstream side can be generated while rotating along the donut-shaped gap, and the flow of the main pipe 10 can be strengthened.

  Further, in the junction 40, the upstream main flow pipe 11 is tapered toward the downstream side, and the downstream main flow pipe 12 is tapered toward the downstream side. Thus, the flow of the main pipe can be made stronger.

  Moreover, in the ejector 30, since the swirl flow is generated by introducing the compressed air, the flow of the branch pipe 20 can be made stronger.

  In addition, since the object to be collected is a granular material, particularly efficient collection is possible.

  As described above, according to the multipoint recovery apparatus and the multipoint recovery method according to the present embodiment, the multipoints in the large recovery target area 100 such as the paint film pieces and the abrasives generated by the blasting work in the oil tank 1 are obtained. Can be efficiently discharged out of the collection target area 200 and collected.

  As described above, the multipoint recovery apparatus and the multipoint recovery method according to the embodiment of the present invention have been described. However, the present invention is not limited to the above-described embodiment, and various other modifications are possible.

  For example, in the present embodiment, the blasting work using the floor surface cleaner in the oil tank has been described, but in addition to this, the abrasive accumulated on the floor surface in the open blasting work in the bridge scaffolding, the tank and the factory It can also be applied to a wide range of cleaning using a plurality of floor cleaners in the inside, drainage work accompanying dew condensation or rainwater intrusion on the open tank floor. The object to be collected is not limited to a granular material, and can also be a liquid in a drainage operation.

DESCRIPTION OF SYMBOLS 1 Petroleum tank 2 Compressor 3 Dust collector 4 Floor surface cleaner 5 Air supply piping 6 Mount 7 Wheel 8 Connection piping 9 Cyclone 10 Main flow piping 11 Main flow piping 12 Main flow piping 13 Main flow piping 14 Main flow piping 20 Branch flow piping 30 Ejector 31 Introduction of compressed air Pipe 32 Suction pipe 33 Discharge pipe 40 Junction 50 Hopper 51 Vacuum cleaner head 52 Floor cleaner 100 Within collection area 200 Outside collection area

Claims (8)

A multi-point collection device that discharges and collects objects to be collected existing at multiple points in the collection target area outside the collection target area,
A mainstream pipe connecting the inside of the collection target area and the outside of the collection target area, a plurality of branch pipes having one end connected to the main pipe, and an ejector provided in the middle of the plurality of branch pipes,
At the junction of the main flow pipe and the branch flow pipe, the upstream main flow pipe is inserted into the downstream main flow pipe, and a gap is formed between the outer surface of the upstream main flow pipe and the inner surface of the downstream main flow pipe. The branch pipe is connected to open toward the gap in a state of being inclined upstream with respect to the main pipe, and is configured to generate a swirl flow by inflow from the branch pipe. And
Due to the suction force generated by the ejector, the objects to be recovered existing at multiple points in the recovery target area are sucked from the other ends of the plurality of branch pipes and discharged out of the recovery target area via the main flow pipes. The multi-point recovery device is characterized in that the recovery is performed.   In the merging portion, the upstream mainstream pipe is tapered toward the downstream side, and the downstream mainstream pipe is tapered toward the downstream side. The multipoint recovery apparatus according to claim 1.   The multipoint recovery apparatus according to claim 1, wherein the ejector generates a swirl flow by introducing compressed air.   The multipoint recovery apparatus according to claim 1, wherein the object to be recovered is a granular material. A multi-point recovery method for discharging and recovering objects to be recovered existing at multiple points in the recovery target area outside the recovery target area,
Connecting the inside of the collection target area and the outside of the collection target area with a main pipe, connecting one end of a plurality of branch pipes to the main pipe, and providing an ejector in the middle of the plurality of branch pipes,
At the junction of the main flow pipe and the branch pipe, the upstream main flow pipe is inserted into the downstream main flow pipe, and a gap is formed between the outer surface of the upstream main flow pipe and the inner surface of the downstream main flow pipe. The branch pipe is connected to the main pipe so as to open toward the gap while being inclined upstream with respect to the main pipe, and a swirling flow is generated by inflow from the branch pipe. ,
Due to the suction force generated by the ejector, the objects to be recovered existing at multiple points in the recovery target area are sucked from the other ends of the plurality of branch pipes and discharged out of the recovery target area via the main flow pipes. A multi-point collection method characterized in that the collection is performed.   The diameter of the upstream main stream pipe is tapered toward the downstream side, and the downstream main stream pipe is tapered toward the downstream side at the junction. 5. The multipoint recovery method according to 5.   6. The multipoint recovery method according to claim 5, wherein the ejector generates a swirl flow by introducing compressed air.   The multipoint recovery method according to claim 5, wherein the object to be recovered is a granular material.

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