JP2015182884A - Branching device and air force transportation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology which suppresses the generation of overrun in a branching device, in an air force transportation device which transports particulates.SOLUTION: This branching device 14 has: a flow-in passage 30 having a flow-in port 31 and a supply port 33; a first discharge passage 40 having a first discharge port 41 and a first introduction port 43; a second discharge passage 50 having a second discharge port 51 and a second introduction port 52; and a branching space 20. The branching space 20 is connected to the supply port 33, the first introduction port 43, and the second introduction port 52. The flow-in passage 30 or the branching space 20 has a stall flow passage. A cross section area vertical to a transportation direction of particulates in the stall passage is larger than a cross section area of the flow-in port 31. By this constitution, particulates are stalled at the stall flow passage. As a result, a transportation speed of the particulates becomes low in the branching space which is branched to the first discharge passage and the second discharge passage. Accordingly, the erroneous intrusion of the particulates into the discharge passage not being a target discharge passage is suppressed.

Description

  The present invention relates to a branching device used when pneumatically transporting a material made of powder or fluid (hereinafter referred to as “powder body”) and a pneumatic transporting device having the branching device.

  Conventionally, an aerodynamic transport apparatus is used for conveying powder particles such as resin pellets. The pneumatic transport device is used in, for example, a plastic molding factory. In a molding factory or the like, when the same kind of granular material is transported to a plurality of molding machines, the granular material is supplied to the plurality of molding machines by inserting a branch device in the transport pipe. A pneumatic transportation device having a conventional branching device is described in Patent Document 1, for example.

Japanese Patent No. 4308366

  In a branching device that branches from a main transport pipe to a sub-transport pipe as in the aerodynamic transport device described in Patent Document 1, when transporting a granular material to a sub-transport pipe in a branch direction, Overrun is likely to occur in which the section erroneously flows into the main transport pipe. In the aerodynamic transportation device described in Patent Document 1, in order to suppress overrun in the branching device, an auxiliary aerodynamic means for introducing the aerodynamic force in the direction opposite to the conveyance direction is provided separately from the aerodynamic source that generates the airflow in the conveyance direction. Have (paragraph 0012). Then, the auxiliary aerodynamic means is operated at a predetermined timing (paragraph 0029).

  However, in the pneumatic transportation apparatus of the above-mentioned patent document 1, since it has an auxiliary | assistant aerodynamic means, an apparatus enlarges. Moreover, it is necessary to control the complicated operation of the auxiliary aerodynamic means. In order to suppress overrun without increasing the size of the pneumatic transportation device, it is necessary not to suppress overrun by means provided outside the branch device, but to have a function to suppress overrun in the branch device itself. Become.

  This invention is made | formed in view of such a situation, and it aims at providing the technique which suppresses that the overrun in a branching device arises.

  In order to solve the above-mentioned problem, the first invention of the present application is a branching device used in an aerodynamic transportation device for transporting powder particles, and has an inlet into which the powder particles flow in at one end and the other end. An inflow path having a supply port, a first discharge port from which the granular material is discharged at one end, a first discharge path having a first introduction port at the other end, and the granular material at one end Branch having a second discharge port to be discharged and having a second introduction port at the other end, connected to the second discharge path, the supply port, the first introduction port, and the second introduction port A cross-sectional area of the cross section perpendicular to the transport direction of the granular material in the stall flow path is a cross-sectional area of the inlet Bigger than.

  A second invention of the present application is the branching device according to the first invention, wherein the inflow path has the stall flow path.

  A third invention of the present application is the branching device of the first invention or the second invention, wherein the inflow path, the branch space, the first discharge path, or the second discharge path is a flow of the granular material. It further has a passage blocking means protruding from the wall surface forming the path.

  A fourth invention of the present application is any one of the branching devices from the first invention to the third invention, and at least a part of the wall surfaces constituting the branch space is a concave surface.

  A fifth invention of the present application is the branching device according to the fourth invention, wherein the first introduction port and the second introduction port face the concave surface.

  A sixth invention of the present application is any one of the branching devices from the first invention to the fifth invention, wherein a transport direction in the vicinity of the first introduction port of the first discharge path, and the second of the second discharge path. 2 The transport direction in the vicinity of the inlet is upward.

  A seventh invention of the present application is any one of the branching devices from the first invention to the sixth invention, wherein the transport direction in the vicinity of the supply port of the inflow route and the vicinity of the first introduction port of the first discharge route The angle formed by the transport direction in the second passage is greater than a right angle, and the angle formed by the transport direction in the vicinity of the supply port of the inflow path and the transport direction in the vicinity of the second introduction port of the second discharge path is greater than a right angle. .

  An eighth invention of the present application is the branching device according to the seventh invention, wherein a transport direction in the vicinity of the supply port of the inflow path is downward, and a transport direction in the vicinity of the first inlet of the first discharge path is Both the transport direction in the vicinity of the second inlet of the second discharge path is upward.

  A ninth invention of the present application is an aerodynamic transport device for transporting a granular material, wherein any branching device from the first invention to the eighth invention, a supply source of the granular material, a branched transport destination, A main transport pipe connecting the most downstream transport destination, the supply source, and the most downstream transport destination, which is arranged on the downstream side of the branch transport destination, and the branch device includes the main transport pipe The inlet is connected to the upstream side of the main transport pipe, the first outlet is connected to the downstream side of the main transport pipe, and the second outlet is the branch destination. Connected to.

  According to the first to ninth inventions of the present application, the granular material flowing in from the inflow port stalls in the stall flow path. Thereby, in the branch space for branching into the 1st discharge path and the 2nd discharge path, the transportation speed of a granular material becomes slow. Accordingly, it is possible to prevent the granular material from erroneously flowing into the discharge path that is not the target discharge path.

  In particular, according to the second invention of the present application, the granular material is stalled before flowing into the branch space. Thereby, it is suppressed more that a granular material erroneously flows into the discharge route which is not aimed.

  In particular, according to the third invention of the present application, the flow rate of the granular material can be made slower by the passage inhibiting means. Thereby, it is further suppressed that the granular material erroneously flows into an unintended discharge route.

  In particular, according to the fourth invention of the present application, in the unlikely event that the granular material has overrun to an unintended discharge path, the overrun granular material is likely to return to the branch space.

  In particular, according to the fifth invention of the present application, the powder particles supplied from the inflow path to the branch space try to gather into the concave surface once. When the first introduction port and the second introduction port face the concave surface, the granular material supplied to the branch space easily branches to the first introduction port or the second introduction port.

  In particular, according to the sixth invention of the present application, since the transport direction from the branch space to the discharge path is upward, it is necessary to resist gravity in order for the granular material to flow into the discharge path. Thereby, it is suppressed more that a granular material erroneously flows into the discharge route which is not aimed.

  In particular, according to the seventh invention of the present application, in the branched space, the transport direction of the granular material bends more than 90 degrees. Thereby, it is suppressed more that a granular material erroneously flows into the discharge route which is not aimed.

  In particular, according to the eighth invention of the present application, in the branch space, the transport direction of the granular material is bent by approximately 180 degrees. In addition, since the transport direction from the branch space to the discharge path is upward, it is necessary to resist gravity in order for the granular material to flow into the discharge path. Thereby, it is further suppressed that the granular material erroneously flows into an unintended discharge route.

It is the schematic of the pneumatic transport apparatus which concerns on 1st Embodiment. It is a longitudinal cross-sectional view of the branch apparatus which concerns on 1st Embodiment. It is a cross-sectional view of the branch device according to the first embodiment. It is a longitudinal cross-sectional view of the branch apparatus which concerns on one modification. It is a cross-sectional view of a branch device according to a modification. It is a longitudinal cross-sectional view of the branch apparatus which concerns on one modification. It is a longitudinal cross-sectional view of the branch apparatus which concerns on one modification. It is a cross-sectional view of a branch device according to a modification. It is a cross-sectional view of a branch device according to a modification.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

<1. First Embodiment>
<1-1. Structure of pneumatic transport device>
First, the whole structure of the aerodynamic transport apparatus 1 of this embodiment is demonstrated. FIG. 1 is a schematic view of a pneumatic transportation device 1 according to a first embodiment of the present invention. This pneumatic transport device 1 is a device that transports a granular material such as a resin pellet to a plurality of transportation destinations such as a molding machine using pneumatic force.

  As shown in FIG. 1, the pneumatic transportation device 1 of the present embodiment includes a granular material supply unit 11, four feeder hoppers 12, a main transportation pipe 13, three branching devices 14, three branching pipes 15, It has an exhaust pipe 16 and a suction blower 17.

  The four feeder hoppers 12 are referred to as a first feeder hopper 121, a second feeder hopper 122, a third feeder hopper 123, and a fourth feeder hopper 124 in order from the upstream side. The three branch devices 14 are referred to as a first branch device 141, a second branch device 142, and a third branch device 143 in order from the upstream side. The three branch pipes 15 are referred to as a first branch pipe 151, a second branch pipe 152, and a third branch pipe 153 in order from the upstream side.

  The granular material supply unit 11 includes a storage hopper 111, a screw feeder 112, and a shooter 113. The storage hopper 111 stores a granular material that is a transport target. The screw feeder 112 supplies a desired amount of powder particles from the storage hopper 111 to the shooter 113.

  The plurality of feeder hoppers 12 are hoppers for temporarily storing powder particles to be transported to each of a plurality of transportation destinations. The feeder hopper 12 has an opening 91 for supplying powder particles to the service hopper 19 disposed below, and a shutter 92 for opening and closing the opening 91. When the shutter 92 is closed, the feeder hopper 12 and the service hopper 19 are disconnected from each other. Each feeder hopper 12 has a filter 93 for removing powder and fine particles from the gas discharged to the exhaust pipe 16. In the present embodiment, the filter 93 is provided above the feeder hopper 12.

  The upstream end of the main transport pipe 13 is connected to the lower end of the shooter 113 of the granular material supply unit 11. Further, the downstream end of the main transport pipe 13 is connected to the inside of the fourth feeder hopper 124 (the most downstream transport destination) on the most downstream side among the plurality of feeder hoppers 12. In the present embodiment, three branch devices 14 are interposed in the main transport pipe 13. When an air flow is generated in the main transport pipe 13 from the upstream side to the downstream side, the granular material supplied from the granular material supply unit 11 is transported from the upstream side to the downstream side.

  In the present embodiment, a portion between the shooter 113 and the first branching device 141 in the main transport pipe 13 is referred to as a first transport pipe 131. A portion between the first branch device 141 and the second branch device 142 is a second transport pipe 132, and a portion between the second branch device 142 and the third branch device 143 is a third transport pipe 133. A portion between the third branch device 143 and the fourth feeder hopper 124 is a fourth transport pipe 134.

  The branching device 14 has an inlet 31, a first outlet 41, and a second outlet 51. The inflow port 31 is connected to the main transport pipe 13 on the upstream side. The first discharge port 41 is connected to the downstream main transport pipe 13. Further, the second discharge port 51 is connected to the branch pipe 15. Thereby, the branching device 14 transfers the granular material supplied from the upstream main transport pipe 13 to the inflow port 31 from the first discharge port 41 to the downstream main transport tube 13 or the second discharge port. The gas is discharged from 51 to the branch pipe 15. The detailed configuration of the branch device 14 will be described later.

  One end of the branch pipe 15 is connected to the second discharge port 51 of the branch device 14, and the other end is connected to the inside of the feeder hopper 12 (the first feeder hopper 121 to the third feeder hopper 123, which is a branch transport destination). . Thereby, the granular material discharged | emitted from the 2nd discharge port 51 of the branch apparatus 14 passes through the inside of the branch pipe 15, and is supplied to the inside of the feeder hopper 12. FIG.

  In the present embodiment, the three branch pipes 15 are a first branch pipe 151, a second branch pipe 152, and a third branch pipe 153 in order from the upstream side. The first branch pipe 151 connects the first branch device 141 and the first feeder hopper 121. The second branch pipe 152 connects the second branch device 142 and the second feeder hopper 122. The third branch pipe 153 connects the third branch device 143 and the third feeder hopper 123.

  The exhaust pipe 16 includes a first exhaust pipe 161, a second exhaust pipe 162, a third exhaust pipe 163, a fourth exhaust pipe 164, and a main exhaust pipe 160. The upstream ends of the first exhaust pipe 161 to the fourth exhaust pipe 164 are connected to the spaces inside the first feeder hopper 121 to the fourth feeder hopper 124 via the filter 93, respectively. Further, the first exhaust pipe 161 to the fourth exhaust pipe 164 are connected to the main exhaust pipe 160 at their downstream ends.

  A first on-off valve 961 to a fourth on-off valve 964 are interposed in the first exhaust pipe 161 to the fourth exhaust pipe 164, respectively. When the first opening / closing valve 961 to the fourth opening / closing valve 964 are opened, the first feeder hopper 121 to the fourth feeder hopper 124 and the main exhaust pipe 160 communicate with each other. On the other hand, when the first on-off valve 961 to the fourth on-off valve 964 are closed, the main exhaust pipe 160 with the first feeder hopper 121 to the fourth feeder hopper 124 is shut off.

  The main exhaust pipe 160 has an upstream end connected to a downstream end of the first exhaust pipe 161. Further, the downstream end of the main exhaust pipe 160 is connected to the suction blower 17 via the dust removing unit 165. The dust removing unit 165 has a filter that removes dust contained in the gas. When an air flow from each feeder hopper 12 toward the suction blower 17 is generated in the main exhaust pipe 160, dust contained in the air flow flowing through the main exhaust pipe 160 is removed in the dust removing unit 165. The dust removing unit 165 may be a dust removing unit other than a filter.

  The suction blower 17 is an aerodynamic device that sucks the gas in the exhaust pipe 16. The suction blower 17 is connected to the downstream end of the main exhaust pipe 160. When the suction blower 17 is driven, the suction blower 17 discharges the gas in the main exhaust pipe 160 to the outside.

<1-2. Operation of the pneumatic transport device>
Next, the operation of the pneumatic transport device 1 will be described. Here, the operation of the pneumatic transport device 1 will be described by taking as an example a case where the granular material is supplied in the order of the first feeder hopper 121, the second feeder hopper 122, the third feeder hopper 123, and the fourth feeder hopper 124. .

  First, the pneumatic transport device 1 opens the first opening / closing valve 961 and closes the second opening / closing valve 962 to the fourth opening / closing valve 964. At this time, the shutter 92 provided in the lower part of each feeder hopper 12 is closed, and the inside of the pneumatic transportation apparatus 1 is airtight. Then, the suction blower 17 is driven. Then, the first transport pipe 131, the first branch device 141, the first branch pipe 151, the first feeder hopper 121, the first exhaust pipe 161, and the main exhaust pipe 160 are sequentially flowed from the shooter 113 to the suction blower 17. Airflow is generated.

  Thereafter, the pneumatic transport device 1 starts driving the screw feeder 112. That is, the supply of the granular material from the storage hopper 111 into the shooter 113 is started. Then, the granular material supplied from the storage hopper 111 to the shooter 113 is flown from the shooter 113 through the first transport pipe 131, the first branch device 141, and the first branch pipe 151 by the air flow generated by the suction blower 17. It is transported to the first feeder hopper 121 and stored below the first feeder hopper 121. On the other hand, the gas in the first feeder hopper 121 from which dust has been removed by the filter 93 is discharged from above the first feeder hopper 121 to the first exhaust pipe 161. The gas is discharged from the suction blower 17 to the outside through the first exhaust pipe 161 and the main exhaust pipe 160.

  Next, the pneumatic transport device 1 closes the first opening / closing valve 961 and opens the second opening / closing valve 962. As a result, the flow of the airflow in the aerodynamic transport device 1 changes, and the first transport pipe 131, the first branch device 141, the second transport pipe 132, the second branch device 142, the second branch pipe 152, the second The two feeder hoppers 122, the second exhaust pipe 162, and the main exhaust pipe 160 sequentially flow to generate an airflow toward the suction blower 17.

  Therefore, the granular material supplied from the storage hopper 111 to the shooter 113 is caused by this air flow to be supplied from the shooter 113 to the first transport pipe 131, the first branch device 141, the second transport pipe 132, the second branch device 142, and It is transported to the second feeder hopper 122 via the second branch pipe 152 and stored below the second feeder hopper 122. On the other hand, the gas in the second feeder hopper 122 from which dust has been removed by the filter 93 is discharged from above the second feeder hopper 122 to the second exhaust pipe 162. The gas is discharged from the suction blower 17 to the outside through the second exhaust pipe 162 and the main exhaust pipe 160.

  Subsequently, the pneumatic transport device 1 closes the second opening / closing valve 962 and opens the third opening / closing valve 963. Thereby, the flow of the airflow in the aerodynamic transport device 1 is changed, and the first transport pipe 131, the first branch device 141, the second transport pipe 132, the second branch device 142, the third transport pipe 133, the first transport pipe from the shooter 113 are changed. The air flows toward the suction blower 17 through the three branch device 142, the third branch pipe 153, the third feeder hopper 123, the third exhaust pipe 163, and the main exhaust pipe 160 in order.

  For this reason, the granular material supplied from the storage hopper 111 to the shooter 113 is caused to flow from the shooter 113 to the first transport pipe 131, the first branch device 141, the second transport pipe 132, the second branch device 142, It is transported to the third feeder hopper 123 via the third transport pipe 133, the third branch device 143, and the third branch pipe 153, and stored below the third feeder hopper 123. On the other hand, the gas in the third feeder hopper 123 from which dust has been removed by the filter 93 is discharged from above the third feeder hopper 123 to the third exhaust pipe 163. The gas is discharged from the suction blower 17 to the outside through the third exhaust pipe 163 and the main exhaust pipe 160.

  Thereafter, the pneumatic transport device 1 closes the third opening / closing valve 963 and opens the fourth opening / closing valve 964. Thereby, the flow of the airflow in the aerodynamic transport device 1 is changed, and the first transport pipe 131, the first branch device 141, the second transport pipe 132, the second branch device 142, the third transport pipe 133, the first transport pipe from the shooter 113 are changed. The air flows toward the suction blower 17 through the three branch device 142, the fourth transport pipe 134, the fourth feeder hopper 124, the fourth exhaust pipe 164, and the main exhaust pipe 160 in order.

  Therefore, the granular material supplied from the storage hopper 111 to the shooter 113 is sent from the shooter 113 to the first transport pipe 131, the first branch device 141, the second transport pipe 132, the second branch device 142, the second It is transported to the fourth feeder hopper 124 via the third transport pipe 133, the third branch device 143, and the fourth transport pipe 134, and stored below the fourth feeder hopper 124. On the other hand, the gas in the fourth feeder hopper 124 from which the dust has been removed by the filter 93 is discharged from above the fourth feeder hopper 124 to the fourth exhaust pipe 164. The gas is discharged from the suction blower 17 to the outside through the fourth exhaust pipe 164 and the main exhaust pipe 160.

  When the supply of the granular material to each feeder hopper 12 is completed, the drive of the screw feeder 112 and the suction blower 17 is stopped. Then, by opening the shutter 92 of each feeder hopper 12, the granular material stored in the feeder hopper 12 is supplied to the service hopper 19.

  As described above, in this pneumatic transport device 1, by opening and closing the open / close valves 961 to 964 provided in the exhaust pipes 161 to 164 connected to the feeder hoppers 12, the granular material is added to the target feeder hopper 12. Can be supplied.

<1-3. Configuration of branch device>
In the pneumatic transportation device 1 described above, in order to reliably supply the granular material to the intended feeder hopper 12, the branching device 14 uses the main transportation pipe 13 and the branch pipe 15 which are the two discharge destinations. It is necessary that the granular material can be discharged only to the discharge destination.

  The structure of the branching device 14 will be described below with reference to FIGS. 2 and 3. FIG. 2 is a longitudinal sectional view of the branching device 14. FIG. 3 is a cross-sectional view of the branching device 14. As shown in FIG. 2, the branching device 14 includes a main body 2, an inflow pipe 3, a first discharge pipe 4, and a second discharge pipe 5.

  The main body 2 has a cylindrical part 21, a bottom part 22, and a lid part 23. The cylindrical portion 21 is a cylindrical portion that extends vertically. The bottom portion 22 is a hemispherical portion that protrudes downward. Therefore, the bottom 22 has a concave surface 221 on the inner surface. The bottom 22 covers the opening below the cylindrical portion 21. The lid portion 23 covers the opening above the cylindrical portion 21.

  The inflow pipe 3 is a circular pipe extending substantially horizontally. An inflow port 31 that is one end of the inflow pipe 3 is connected to the main transport pipe 13 on the upstream side. A connection port 32 that is the other end of the inflow pipe 3 is connected to a side surface of the cylindrical portion 21. Thereby, the internal space of the inflow pipe 3 and the internal space of the cylindrical portion 21 communicate with each other via the connection port 32.

  The first discharge pipe 4 is a circular pipe extending substantially horizontally. A first discharge port 41 that is one end of the first discharge pipe 4 is connected to the downstream main transport pipe 13. The first discharge pipe 4 passes through the side wall of the cylindrical portion 21. And the protrusion 42 which is the other end of the 1st discharge pipe 4 is arrange | positioned inside the cylindrical part 21. As shown in FIG. The internal space of the first discharge pipe 4 and the internal space of the cylindrical portion 21 communicate with each other via the protruding port 42.

  The second discharge pipe 5 is a circular pipe extending vertically. A second discharge port 51, which is an upper end portion of the second discharge pipe 5, is connected to the branch pipe 15. The 2nd discharge pipe 5 penetrates the cover part 23 up and down. The second introduction port 52, which is the lower end portion of the second discharge pipe 5, is disposed in the internal space of the bottom portion 22.

  The main body 2 has a partition plate 24 that partitions the internal space of the cylindrical portion 21 into two spaces. As shown in FIG. 2, the partition plate 24 extends vertically from the vicinity of the lid portion 23 to the vicinity of the lower end portion of the cylindrical portion 21. The partition plate 24 extends in the radial direction from the outer peripheral surface of the second discharge pipe 5 to the vicinity of the inner peripheral surface of the cylindrical portion 21. Thereby, the internal space of the cylindrical portion 21 is partitioned into a first space 211 connected to the connection port 32 and a second space 212 connected to the protruding port 42.

  In the present embodiment, the partition plate 24 is fixed to the outer peripheral surface of the second discharge pipe 5. The partition plate 24 may be fixed to the inner peripheral surface of the cylindrical portion 21, or may be fixed to both the outer peripheral surface of the second discharge pipe 5 and the inner peripheral surface of the cylindrical portion 21. In the present embodiment, a slight gap through which the granular material does not pass is interposed between the partition plate 24 and the inner peripheral surface of the cylindrical portion 21. Thus, the communication between the first space 211 and the second space 212 may not be completely blocked by the partition plate 24.

  By having such a configuration, the branching device 14 discharges the granular material to the inflow path 30 into which the granular material supplied from the upstream main transport pipe 13 flows and to the downstream main transport pipe 13. The first discharge path 40, the second discharge path 50 that discharges the granular material to the branch pipe 15, and the branch space 20 that relays the inflow path 30, the first discharge path 40, and the second discharge path 50. Have.

  As shown in FIG. 2, the inflow path 30 includes a space in the inflow pipe 3 and a first space 211. In the first space 211, the transport direction of the powder particles is downward. The cross-sectional area of the cross section perpendicular to the transport direction of the granular material in the first space 211, that is, the cross-sectional area of the substantially horizontal cross section of the first space 211 is larger than the cross-sectional area of the inflow path 30 in the inflow port 31.

  Thereby, the transport speed of the granular material in the first space 211 is slower than the transport speed of the granular material in the inflow port 31. That is, the first space 211 is a stall flow path that temporarily decreases the transport speed of the granular material. Further, the lower end portion of the first space 211 serves as a supply port 33 for supplying powder particles from the inflow path 30 to the branch space 20.

  The first discharge path 40 includes a second space 212 and a space in the first discharge pipe 4. Here, the main body 2 has a baffle plate 25 in the vicinity of the lower end of the second space 212. As shown in FIG. 2, the baffle plate 25 extends substantially horizontally from the inner peripheral surface near the lower end of the cylindrical portion 21 toward the inside. The baffle plate 25 is a passage-inhibiting means that protrudes from the inner peripheral surface of the cylindrical portion 21 that is a wall surface that forms a flow path of the granular material from the branch space 20 to the first discharge path.

  Further, as shown in FIG. 3, a gap having a width that allows the granular material to pass sufficiently is interposed between the inner edge of the baffle plate 25 and the outer peripheral surface of the second discharge pipe 5. The gap is a first introduction port 43 that communicates the branch space 20 and the second space 212.

  The second discharge path 50 is a space in the second discharge pipe 5. The 2nd inlet 52 which connects the branch space 20 and the space in the 2nd discharge pipe 5 is an edge part of the downward side of the 2nd discharge pipe 5 as above-mentioned.

  The branch space 20 is a space surrounded by the concave surface 221, the supply port 33, the first introduction port 43 and the baffle plate 25, and the second introduction port 52. That is, at least a part of the wall surface constituting the branch space 20 is the concave surface 221. Therefore, the granular material supplied from the supply port 33 tends to gather on the concave surface 221. Further, the supply port 33, the first introduction port 43, and the second introduction port 52 face the concave surface 221. Thereby, in the unlikely event that the granular material has overrun to an unintended discharge path, the overrun granular material is returned to the branch space, and the target granular material is discharged from the branch space 20 to the target discharge path. Can be aspirated.

<1-4. Movement of granular material in branching device>
Next, the movement of the granular material in the branching device 14 will be described.

  First, the case where a granular material is transported from the upstream main transport pipe 13 to the branch pipe 15 will be described. In this case, the granular material is supplied to the feeder hopper 12 connected to the branch pipe 15. When the suction blower 17 sucks the gas inside the feeder hopper 12 to be supplied, the air flows from the inlet 31 to the branching device 14 through the inflow path 30, the branch space 20, and the second discharge path 50. Thus, an air flow toward the second discharge port 51 is generated. At the same time, the granular material supplied from the shooter 113 to the upstream main transport pipe 13 is supplied from the inlet 31 into the branching device 14.

  The granular material supplied from the upstream main transport pipe 13 to the inlet 31 is transported through the inflow path 30 in the order of the space in the inflow pipe 3 and the first space 211. And in the 1st space 211 which is a stall channel, the transportation speed of a granular material falls. Thereafter, the granular material whose transport speed has decreased flows into the branch space 20. In this manner, by causing the powder particles to stall, the erroneous flow of the powder particles to the first discharge path 40 is suppressed.

  The powder that has flowed into the branch space 20 has a force to gather at the center of the concave surface 221 due to gravity, a force to move toward the first discharge path 40 along the concave surface 221 due to inertia, and the suction blower 17. The force which tends to go to the 2nd discharge path 50 by the air current which occurred by this works.

  In the branched space 20, powder particles having a relatively low transport speed tend to gather near the center of the concave surface 221 due to gravity. Here, as shown in FIG. 2, the second introduction port 52 faces the center of the concave surface 221. Further, since the second introduction port 52 is disposed below the first introduction port 43, the second introduction port 52 is closer to the center of the concave surface 221 than the first introduction port 43. Thereby, the granular material which goes to the center vicinity of the concave surface 221 goes to the 2nd discharge path 50 from the 2nd inlet 52 efficiently.

  On the other hand, in the branched space 20, among the granular materials, a particularly fast transport speed hits the concave surface 221 and travels along the concave surface 221. A part of the granular material traveling along the concave surface 221 collides with the baffle plate 25. In other words, powders having a particularly high transport speed are likely to collide with the baffle plate 25. As a result, it is efficiently suppressed that the granular material overruns the first discharge path 40.

  In addition, even if the powder particles are overrun from the first inlet 43 to the first discharge path 40, the overrun powder particles are directed vertically upward in the second space 212. Easy to fall down. Therefore, it is suppressed that the granular material overrun to the second space 212 erroneously flows into the first discharge pipe 4. In addition, the projecting port 42 of the first discharge pipe 4 is disposed so as to project inward from the inner surface of the cylindrical portion 21. Thereby, it is further suppressed that the granular material overrun into the second space 212 erroneously flows into the first discharge pipe 4.

  Next, the case where a granular material is conveyed from the upstream main transport pipe 13 to the downstream main transport pipe 13 will be described. When the suction blower 17 sucks the gas inside the feeder hopper 12 to be supplied, the air flows from the inlet 31 into the branching device 14 through the inflow path 30, the branch space 20, and the first discharge path 40. Thus, an air flow toward the first discharge port 41 is generated. At the same time, the granular material supplied from the shooter 113 to the upstream main transport pipe 13 is supplied from the inlet 31 into the branching device 14.

  The granular material supplied from the upstream main transport pipe 13 to the inlet 31 is transported through the inflow path 30 in the order of the space in the inflow pipe 3 and the first space 211. And in the 1st space 211 which is a stall channel, the transportation speed of a granular material falls. Thereafter, the granular material whose transport speed has decreased flows into the branch space 20.

  The powder that has flowed into the branch space 20 has a force to gather at the center of the concave surface 221 due to gravity, a force to move toward the first discharge path 40 along the concave surface 221 due to inertia, and the suction blower 17. The force which tends to go to the 1st discharge path 40 by the airflow generated by this works.

  In the branched space 20, powder particles having a relatively low transport speed tend to gather near the center of the concave surface 221 due to gravity. And the granular material which goes to the center vicinity of the concave surface 221 goes to the 1st discharge path 40 from the 1st inlet 43 by the airflow which generate | occur | produced by the suction blower 17. FIG.

  On the other hand, in the branched space 20, among the granular materials, a particularly fast transport speed hits the concave surface 221 and travels along the concave surface 221. A part of the granular material traveling along the concave surface 221 collides with the baffle plate 25. In other words, powders having a particularly high transport speed are likely to collide with the baffle plate 25. The granular material that has stalled by colliding with the baffle plate 25 tends to gather at the center of the concave surface 221 by gravity. And the said granular material goes to the 1st discharge path 40 from the 1st inlet 43 by the airflow which the suction blower 17 generate | occur | produced.

  Thus, in this embodiment, since the supply port 33 faces the concave surface 221, the granular material supplied from the inflow path 30 to the branch space 20 tends to go to the center of the concave surface 221. And since the 1st inlet 43 and the 2nd inlet 52 face the concave surface 221, the granular material supplied to the branch space 20 is the 1st inlet 43, the 2nd inlet 52, and Easy to branch into. That is, it is suppressed that a granular material erroneously flows into the discharge path which is not aimed.

  In the present embodiment, the transport direction in the vicinity of the first inlet 43 of the first discharge path 40 and the transport direction in the vicinity of the second inlet 52 of the second discharge path 50 are both upward. Thereby, in order for a granular material to flow in into each discharge path, it is necessary to oppose gravity. Therefore, it is further suppressed that the granular material erroneously flows into an unintended discharge route.

  Furthermore, the transport direction in the vicinity of the supply port 33 of the inflow path 30 is downward. As a result, in the branch space 20, the transport direction of the granular material is bent by nearly 180 degrees from the inflow path 30 to the first discharge path 40 or the second discharge path 50. As described above, in the branch space 20, when the inflow path 30 is directed to any of the discharge paths, the transport direction of the granular material is bent more than 90 degrees, so that the granular material is erroneously discharged to an undesired discharge path. Inflow is further suppressed.

<2. Modification>
Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment.

  FIG. 4 is a longitudinal sectional view of a branching device 14A according to a modification. In the example of FIG. 4, the second introduction port 52 </ b> A that is the lower end portion of the second discharge pipe 5 </ b> A is provided not diagonally but obliquely. Further, the second introduction port 52A opens in the direction opposite to the supply port 33A in the branch space 20A. Thereby, the end on the supply port 33A side of the second introduction port 52A is positioned below the end on the opposite side. Therefore, the granular material supplied from the supply port 33A to the branch space 20A collides with the end of the second introduction port 52A on the supply port 33A side, and is likely to be stalled. As a result, the transportation speed of the granular material in the branch space 20A becomes slow, and it is easy to branch into the first introduction port 43A and the second introduction port 52A.

  On the other hand, by providing the second introduction port 52A obliquely, the second introduction port 52A can be enlarged without increasing the diameter of the second discharge pipe 5A. Thereby, when the air flow toward the second discharge port 41A from the inlet 31A through the branch space 20A is generated in the branching device 14A by the suction blower, the granular material supplied into the branch space 20A is It is easy to go into the second discharge pipe 5A.

  FIG. 5 is a cross-sectional view of a branching device 14B according to another modification. In the above embodiment, the first space and the second space partitioned by the partition plate have substantially the same volume, but the present invention is not limited to this.

  In the example of FIG. 5, the partition plate 24B partitions the space in the cylindrical portion 21B into a first space 211B and a second space 212B. The first space 211B is larger than the second space 212B. Thereby, the cross-sectional area of the 1st space 211B which is a stall flow path can be taken large, without enlarging the diameter of the cylindrical part 21B. Therefore, the granular material can be reliably branched without increasing the size of the branching device 14B.

  FIG. 6 is a longitudinal sectional view of a branching device 14C according to another modification. In the example of FIG. 6, the baffle plate 25C extends obliquely downward from the inner peripheral surface near the lower end of the cylindrical portion 21C. That is, the baffle plate 25C goes downward as it goes inward.

  Thereby, when supplying a granular material to the 2nd discharge port 51C, when the granular material which overruns to the 1st discharge path 40C has laid on the upper surface of the baffle plate 25C, it is to branching space 20C. And easy to return. Therefore, the branching device 14 </ b> C can more reliably branch the granular material because the upper surface of the baffle plate 25 </ b> C is inclined.

  FIG. 7 is a longitudinal sectional view of a branching device 14D according to another modification. In the above embodiment, the first discharge channel is configured by the space inside the first discharge pipe and a part of the internal space of the main body, but the present invention is not limited to this. In the example of FIG. 7, the first discharge path consists only of the space inside the first discharge pipe 4D.

  As shown in FIG. 7, one end of the first discharge pipe 4D is a first discharge port 41D. The other end of the first discharge pipe 4D is a first introduction port 43D. The first introduction port 43D is disposed downward in the internal space of the bottom 22D. Thereby, the whole internal space of cylindrical part 21D except 1st discharge pipe 4D and 2nd discharge pipe 5D serves as a stall channel. That is, the cross-sectional area of the stall flow path can be increased without increasing the size of the branching device 14D. Therefore, the granular material can be reliably branched without increasing the size of the branching device 14D.

  FIG. 8 is a cross-sectional view of a branching device 14E according to another modification. In the branching device of the above embodiment, the granular material supplied from the inflow port is branched into one of the two discharge ports, the first discharge port and the second discharge port, but the present invention is not limited to this. . The branching device of the present invention may branch the granular material supplied from the inlet into three or more outlets.

  In the example of FIG. 8, the branch device 14E includes a first discharge pipe 4E, a second discharge pipe 5E, and a third discharge pipe 6E. The 3rd discharge pipe 6E is a circular pipe extended up and down similarly to the 2nd discharge pipe 5E. And the 3rd discharge pipe 6E is arranged along with the 2nd discharge pipe 5E. A third discharge port (not shown) which is an upper end portion of the third discharge pipe 6E is connected to a branch pipe different from the branch pipe to which the second discharge pipe 5E is connected. Thereby, the granular material supplied into the branching device 14E from the inflow port 31E can be branched into three discharge ports.

  FIG. 9 is a cross-sectional view of a branching device 14F according to another modification. In the example of FIG. 9, the partition plate 24F partitions the space in the cylindrical portion 21F into three spaces, a first space 211F, a second space 212F, and a third space 213F.

  The first discharge pipe 4F is a circular pipe extending substantially horizontally, like the first discharge pipe of the above embodiment. The first discharge port 41F, which is one end of the first discharge pipe 4F, is connected to the downstream main transport pipe. The other end of the first discharge pipe 4F is disposed in the second space 212F. The first discharge path includes a second space 212F and a space in the first discharge pipe 4F.

  The second discharge pipe 5F is a circular pipe extending substantially horizontally. A second discharge port 51F, which is one end of the second discharge pipe 5F, is connected to the branch pipe. The other end of the second discharge pipe 5F is disposed in the third space 213F. The second discharge path includes a third space 213F and a space in the second discharge pipe 5F.

  In the branch device of the above embodiment, the first discharge path and the second discharge path have different configurations, but the present invention is not limited to this. As in the example of FIG. 9, the second discharge path may have the same configuration as the first discharge path.

  Moreover, in said embodiment, the 1st space which is a stall flow path was provided in a part of inflow flow path. However, the stall flow path should just be provided in at least one part of the inflow flow path and the branch space.

  Moreover, in said embodiment, the baffle plate as a passage inhibition means was provided in the flow path of the granular material from the branch space to the 1st discharge path. However, the baffle plate should just be provided in at least one part of the inflow flow path, the branch space, the 1st discharge path, and the 2nd discharge path. Further, the passage blocking means may have a shape different from that of the baffle plate.

  Moreover, in said embodiment, although the transportation destination of the pneumatic transportation apparatus was four, this invention is not limited to this. The transportation destination of the pneumatic transportation device may be two or three, or may be five or more.

  Moreover, you may combine suitably each element which appeared in said embodiment and modification in the range which does not produce inconsistency.

DESCRIPTION OF SYMBOLS 1 Pneumatic transport apparatus 2 Main-body part 3 Inflow pipe 4,4D, 4E, 4F 1st discharge pipe 5,5A, 5D, 5E, 5F 2nd discharge pipe 6E 3rd discharge pipe 11 Powder body supply part 12 Feeder hopper 13 Main Transport pipe 14, 14A, 14B, 14C, 14D, 14E, 14F Branch device 15 Branch pipe 16 Exhaust pipe 17 Suction blower 20, 20A, 20C Branch space 21, 21B, 21C, 21D, 21F Cylindrical part 22, 22D Bottom part 23 Lid Portion 24, 24B, 24F Partition plate 25, 25C Baffle plate 30 Inflow path 31, 31A, 31E Inlet 32 Connection port 33, 33A Supply port 40, 40C First discharge path 41, 41A, 41D, 41F First discharge port 42 Projection port 43, 43A, 43D First introduction port 50 Second discharge path 51, 51C, 51F Second discharge port 52, 52A Second introduction port 2 1,211B, 211F first space 212,212B, 212F, 213F second space 221 recessed surface

Claims (9)

A branching device used in an aerodynamic transportation device for transporting powder particles,
An inflow path having an inlet into which the granular material flows in at one end and a supply port at the other end;
A first discharge path having a first discharge port through which the granular material is discharged at one end and a first introduction port at the other end;
A second discharge path having a second discharge port through which the granular material is discharged at one end and a second introduction port at the other end;
A branch space connected to the supply port, the first introduction port, and the second introduction port;
Have
The inflow path or the branch space has a stall flow path,
A branching device in which a cross-sectional area of a cross section perpendicular to the transport direction of the granular material in the stall flow path is larger than a cross-sectional area of the inlet. The branching device according to claim 1,
A branching device in which the inflow path has the stall flow path. The branching device according to claim 1 or 2,
The branching device, further comprising a passage inhibition means, wherein the inflow path, the branch space, the first discharge path, or the second discharge path protrudes from a wall surface that forms a flow path of the granular material. A branching device according to any one of claims 1 to 3,
A branching device, wherein at least a part of the wall surface constituting the branching space is a concave surface. The branching device according to claim 4,
The first introduction port and the second introduction port are branching devices facing the concave surface. A branching device according to any one of claims 1 to 5,
A branching device in which both the transport direction in the vicinity of the first inlet of the first discharge path and the transport direction in the vicinity of the second inlet of the second discharge path are upward. A branching device according to any one of claims 1 to 6,
The angle formed by the transport direction in the vicinity of the supply port of the inflow path and the transport direction in the vicinity of the first inlet of the first discharge path is greater than a right angle,
A branching device, wherein an angle formed by a transport direction in the vicinity of the supply port of the inflow route and a transport direction in the vicinity of the second introduction port of the second discharge route is larger than a right angle. The branching device according to claim 7,
The transport direction in the vicinity of the supply port of the inflow path is downward,
A branching device in which both the transport direction in the vicinity of the first inlet of the first discharge path and the transport direction in the vicinity of the second inlet of the second discharge path are upward. An aerodynamic transport device for transporting powder particles,
A branching device according to any one of claims 1 to 8;
A source of powder,
Branch destination and
Disposed at the downstream side of the branch destination, the most downstream destination, and
A main transport pipe connecting the supply source and the most downstream transport destination;
Have
The branch device is inserted in the main transport pipe,
The inlet is connected to the upstream side of the main transport pipe;
The first discharge port is connected to the downstream side of the main transport pipe,
The second discharge port is a pneumatic transportation device connected to the branch transportation destination.

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