JP2012081643A - Fine powder removing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fine powder removing apparatus which can freely design the shape of the apparatus and lengthen the retention time of an air-fuel mixture on a filter face.SOLUTION: The fine powder removing apparatus includes: an inner cylinder 10; and an outer cylinder 20. At least a part of an overlapping part with the sidewall of the outer cylinder 20 in the axial direction of the central axis 11 of the inner cylinder 10 of the sidewall of the inner cylinder 10 is made to be a porous filter 30, and a first inlet pipe 60 for making an air-fuel mixture 3 of air 1 and pellets 2 flow into the inner cylinder 10 is provided, and an outlet pipe 70 for making the air 1 passing through filter holes 31 with fine powder 4 included in the air-fuel mixture 3 flowed into the inner cylinder 10 flow out to the outside of the outer cylinder 20 is provided. A second inlet 120 for making air 1a for generating a revolving air flow into the inner cylinder 10 is provided, and a revolving air flow 9 with the same revolving direction with the flow 6 of the air-fuel mixture 3 flowing spirally along the inner wall of the filter 30 is formed by the air 1a flowing into the inner cylinder 10 therefrom.

Description

  The present invention relates to a fine powder removing apparatus for removing fine powder from a granular material.

  An example of a mechanism for removing fine powder from a granular material is disclosed in Patent Documents 1 and 2. In this mechanism, a supply pipe is provided above a cylindrical casing, a suction pipe is provided below the casing, and a cylindrical filter having a net-like side wall is provided in the casing. A supply pipe is connected to a material tank containing plastic resin pellets (an example of a granular material) with a hose or pipe, and a suction pipe is connected to the suction blower with a hose or pipe. Due to the action of centrifugal force generated by this spiral flow, the mixture of pellets and air (an example of transport gas for granular materials) flows in from the supply pipe and flows down along the inner wall (filter surface) of the filter. The powder adhering to the pellet (an example of fine powder) and the pellet are separated into the inside and outside of the filter side wall, the air containing the powder is discharged from the suction pipe, and the pellet from which the powder has been removed is from the opening at the lower end of the filter Fall.

  In Patent Document 2, the air suction port that is a suction pipe has a larger diameter than the powder body suction port that is a supply pipe, and the distance from the center of the casing is the distance between the center of the casing and the powder body suction port. It is proposed that the air-fuel mixture flow along the inner wall of the filter is spiraled by providing it so that it is larger than the distance to the installation position, and the residence time of the air-fuel mixture on the filter surface is increased.

JP 2007-50354 A JP 2009-273969 A

  When the fine powder is removed from the granular material as described above, the removal efficiency of the fine powder increases if the residence time of the air-fuel mixture on the filter surface can be increased. However, the technique disclosed in Patent Document 2 has a problem that the shape of the apparatus is restricted.

  An object of the present invention is to provide a fine powder removing device that can freely design the shape of the device and can increase the residence time of the air-fuel mixture on the filter surface.

  In order to achieve the above object, the present invention comprises an inner cylinder and an outer cylinder arranged outside the inner cylinder, and of the side walls of the inner cylinder, the side wall of the outer cylinder in the axial direction of the central axis of the inner cylinder At least a part of the overlapping portion is a porous filter, and an inflow port is provided in the inner cylinder for allowing the mixture of the particulate transport gas and the powder to flow in, and the mixture that has flowed into the inner cylinder. In the fine powder removing apparatus, the second flow for flowing the gas for generating the swirling air flow into the inner cylinder is provided with an outlet for allowing the transport gas passing through the side wall of the filter to flow out of the outer cylinder together with the fine powder contained in the inner cylinder. An inlet is provided, and the swirling airflow having the same swirling direction as the flow of the air-fuel mixture flowing spirally along the inner wall of the filter is formed by the gas flowing into the inner cylinder from the second inflow port. It is characterized by There is provided a fine powder removal device.

  According to the present invention, the second inflow port for allowing the gas for generating the swirling airflow to flow into the inner cylinder is provided, and spiraled along the inner wall of the filter by the gas introduced from the second inflow port into the inner cylinder. The swirling airflow is the same as the flow of the airflowing mixture, and the swirling airflow entrains the airflow of the airflowing airflow along the inner wall of the filter. Since it is close to a spiral shape with a small lead angle, it is possible to provide a fine powder removing device in which the shape of the device can be freely designed and the residence time of the air-fuel mixture on the filter surface can be increased.

  In the present invention, the second inflow port is provided below the inflow port, so that when the air-fuel mixture introduced from the inflow port is lowered while swirling along the inner wall of the filter, the flow of the air-fuel mixture is reduced. The spiral can be made close to the swirling airflow and have a small lead angle. Conversely, the second inflow port is provided above the inflow port so that when the air-fuel mixture introduced from the inflow port is raised while swirling along the inner wall of the filter, the flow of the air-fuel mixture is swirled. A spiral with a small lead angle can be made close to the air flow.

  Further, by reducing the flow rate of the gas flowing in from the second inflow port from the flow rate of the transport gas in the air-fuel mixture flowing in from the inflow port, the gas flowing in from the second inflow port It is possible to prevent the inflow of the air-fuel mixture.

  Furthermore, the inflow direction of the gas flowing in from the second inflow port includes an upward component, and particularly when the air-fuel mixture flowing in from the inflow port is lowered while swirling along the inner wall of the filter, the mixing is performed. The air flow can be further spiraled with a smaller lead angle.

It is a figure which shows the whole structure of the fine powder removal apparatus of Example 1 of this invention. It is a figure which shows the external appearance of the fine powder removal apparatus of Example 1, (A) is a front view, (B) is a top view, (C) is a side view. It is a figure which shows the usage example of the fine powder removal apparatus of Example 1. FIG. It is a side view which shows the flow of the air in the fine powder removal apparatus of Example 1. FIG. It is a top view which shows the flow of the air in the fine powder removal apparatus of Example 1, (A) is a top view which shows the flow of the air in an inflow port part, (B) shows the flow of the air in a isolation | separation part. A top view and (C) are top views which show the flow of the air in an outflow part. It is a figure which shows the deformation | transformation structure of the 2nd inflow port of the fine powder removal apparatus of Example 1. FIG. It is a figure which shows the other air supply means to the 2nd inflow port of the fine powder removal apparatus of Example 1. FIG. It is a figure which shows the whole structure of the fine powder removal apparatus of Example 2 of this invention. It is a figure which shows the external appearance of the fine powder removal apparatus of Example 2, (A) is a front view, (B) is a top view, (C) is a side view. It is a side view which shows the flow of the air in the fine powder removal apparatus of Example 2. It is a top view which shows the flow of the air in the fine powder removal apparatus of Example 2, (A) is a top view which shows the flow of the air in an inflow port part, (B) shows the flow of the air in a isolation | separation part. A top view and (C) are top views which show the flow of the air in an outflow part. It is a figure which shows the whole structure of the fine powder removal apparatus of Example 3 of this invention. It is a side view which shows the flow of the air in the fine powder removal apparatus of Example 3. It is a top view which shows the flow of the air in the fine powder removal apparatus of Example 3, (A) is a top view which shows the flow of the air in an inflow port part, (B) shows the flow of the air in a isolation | separation part. A top view and (C) are top views which show the flow of the air in an outflow part. It is a figure which shows the whole structure of the fine powder removal apparatus of Example 4 of this invention. It is a figure which shows the external appearance of the fine powder removal apparatus of Example 4, (A) is a front view, (B) is a top view, (C) is a side view. It is a side view which shows the flow of the air in the fine powder removal apparatus of Example 4. It is a top view which shows the flow of the air in the fine powder removal apparatus of Example 4, (A) is a top view which shows the flow of the air in a isolation | separation part, (B) shows the flow of the air in an outflow part. A top view and (C) are top views which show the flow of the air in an inflow port part.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described based on examples shown in the drawings.

  The fine powder removing apparatus according to the first embodiment will be described with reference to FIGS. FIG. 1 is a diagram showing the overall configuration of the fine powder removing apparatus of Example 1, FIG. 2 is a diagram showing the appearance of the fine powder removing apparatus of Example 1, (A) is a front view, (B) is a plan view, C) is a side view, FIG. 3 is a view showing an example of use of the fine powder removing apparatus of the first embodiment, FIG. 4 is a side view showing the air flow in the fine powder removing apparatus of the first embodiment, and FIG. It is a top view which shows the flow of the air in the fine powder removal apparatus of (A), (A) is a top view which shows the flow of the air in an inflow port part, (B) is a top view which shows the flow of the air in a separation part, (C) is a top view which shows the flow of the air in an outflow port part.

  As shown in FIG. 1 and FIG. 2, the fine powder removing apparatus of the present embodiment includes an inner cylinder 10 including a filter 30, an outer cylinder 20 arranged coaxially on the outer side of the inner cylinder 10, and a stand for installing the fine powder removing apparatus. The plate 40 and the upper lid 50 are used.

  The filter 30 constitutes at least part of a portion of the side wall of the inner cylinder 10 that overlaps the side wall of the outer cylinder 20 in the axial direction of the central axis 11 of the inner cylinder 10, and the air-fuel mixture 3 ( 3 to 5) for separating the fine powder 4 from the plastic resin pellet 2 (an example of a granular material) in the outside of the side wall of the inner cylinder 10, the central axis 11 of the inner cylinder 10 being a vertical line At this time, it is formed into a truncated cone shape that is narrowed vertically downward, and only the air 1 and the fine powder 4 in the air-fuel mixture 3 are allowed to pass through substantially the entire side wall (side surface) (the pellet 2 is not allowed to pass). ) A large number of filter holes 31 are arranged in a staggered pattern. The side walls of the filter 30 are made of punching metal.

  Each filter hole 31 causes the flow 6 of the air-fuel mixture 3 flowing spirally along the inner wall (filter surface) of the filter 30 to flow in a direction perpendicular to the central axis 11 of the inner cylinder 10 (the central axis 11 of the inner cylinder 10 is vertical). In the case of a line, it is formed in a long hole whose length direction is a direction perpendicular to the central axis 11 of the inner cylinder 10.

  The inner cylinder 10 includes a filter 30, an upper cylinder portion 12 formed in a cylindrical shape having substantially the same diameter as the upper opening diameter of the filter 30, and a lower cylinder portion formed in a cylindrical shape having substantially the same diameter as the lower opening diameter of the filter 30. 13 has a three-piece structure, and a filter 30 is disposed between them so as to connect the upper and lower cylindrical portions 12 and 13. The upper and lower cylindrical portions 12 and 13 may have a truncated cone shape whose side walls are arranged in a conical surface including the side wall of the filter 30. The outer cylinder 20 has a two-piece structure of a cylindrical upper cylinder part 21 and a lower cylinder part 22 having substantially the same diameter. The coaxially arranged inner cylinder 10 and outer cylinder 20 are raised at a right angle from the base plate 40, and the upper part of the inner cylinder 10 (upper cylinder part 12) is the upper opening of the outer cylinder 20 (upper opening of the upper cylinder part 21). The upper opening of the inner cylinder 10 (upper opening of the upper cylinder portion 12) is closed by the upper lid 50, and the upper opening of the outer cylinder 20 is the upper part of the inner cylinder 10 passing through the upper cylinder and the side wall thereof. Is closed by a flange 12a provided so as to protrude from the outer cylinder 20 to the upper side.

  An inlet (a first inlet) for allowing the air-fuel mixture 3 to flow into the inner cylinder 10 tangentially from the side wall of the upper part (upper cylinder part 12) of the inner cylinder 10 protruding upward from the upper opening of the outer cylinder 20. Inflow pipe 60 (hereinafter referred to as “first inflow pipe”). The first inflow pipe 60 is a straight pipe, and the inlet 61 in the first inflow pipe 60 is formed in a circular shape, the outlet 62 is formed in a rectangular shape, and the outlet 62 extends along the upper side wall of the inner cylinder 10. (See FIG. 5A).

  A gas 1a (see FIGS. 3 to 5) for generating a swirling airflow is introduced into the inner cylinder 10 from the side wall in a tangential direction, and the gas 1a causes the mixture 3 to flow spirally along the inner wall of the filter 30. A second inflow pipe 120 is provided as a second inlet for forming a swirling airflow 9 (see FIGS. 4 and 5C) having the same swirling direction as the flow 6. The second inflow pipe 120 circulates the gas 1 a for generating the swirling airflow from the side wall below the first inflow pipe 60 in the axial direction of the central axis 11 of the inner cylinder 10 among the side walls of the inner cylinder 10. Among the side walls of the inner cylinder 10, the inner cylinder 10 is provided on the side wall below the first inflow pipe 60 in the axial direction of the central axis 11 of the inner cylinder 10. Specifically, it is provided on the side wall of the lower part (lower cylinder part 13) of the inner cylinder 10. The second inflow pipe 120 is a straight pipe and penetrates the side wall of the lower part (lower cylinder part 22) of the outer cylinder 20, and the inlet 121 in the second inflow pipe 120 is formed in a circular shape. Opened to the lower outside. The outlet 122 in the second inflow pipe 120 is formed in a rectangular shape, and the outlet 122 is opened along the side wall of the lower part (lower cylinder part 22) of the inner cylinder 10 (see FIG. 5C).

Of the side wall of the outer cylinder 20, the lower part (lower cylinder part 22) of the outer cylinder 20 that overlaps the side wall of the lower part (lower cylinder part 13) than the filter 30 of the inner cylinder 10 in the axial direction of the central axis 11 of the inner cylinder 10. ) From the inside of the inner cylinder 10 through the inner side of the inner cylinder 10 (the side walls of the filter 30 and the side of the lower cylinder part 13) and the outer cylinder 20 It is an outlet for causing the fine powder 4 mixed air 1 that has flowed into the annular space 20A between the side wall (the side wall of the upper cylinder part 21 and the side wall of the lower cylinder part 22) to flow out of the outer cylinder 20 in the tangential direction. An outflow pipe 70 is provided. The outflow pipe 70 is a straight pipe, and both the inlet 71 and the outlet 72 of the outflow pipe 70 are formed in a circular shape. The outflow pipe 70 is an annular space 20 </ b> A between the side wall of the inner cylinder 10 and the side wall of the outer cylinder 20, and the lower part of the annular space 20 </ b> A between the lower side wall of the inner cylinder 10 and the lower side wall of the outer cylinder 20. In order to form the inlet 71 which entered, it has the pipe | tube side wall 73 which entered the annular space 20A lower part between the lower side wall of the inner cylinder 10, and the lower side wall of the outer cylinder 20 (refer FIG. 5C). .
In this embodiment, between the outflow pipe 70 and the side wall of the outer cylinder 20 (outer wall of the annular space 20A), between the outflow pipe 70 and the base plate 40 (the bottom surface of the outer cylinder 20: the bottom surface of the annular space 20A), respectively. Although there are gaps, it is preferable that these are not present. Although the circular opening shape of the inlet 71 of the outflow pipe 70 is shown, it may be circular or rectangular. The inlet 71 of the outflow pipe 70 is rectangular and preferably has no gap between the side wall of the outer cylinder 20 and the base plate 40.

  A circular through hole 41 having substantially the same diameter as the lower opening of the inner cylinder 10 (lower opening of the lower cylinder part 13) is provided at the center of the base plate 40, and the inner cylinder 10 is the edge of the through hole 41 of the base plate 40. The lower opening of the inner cylinder 10 is opened to the lower surface side of the base plate 40 to form a discharge port 13a for the pellet 2 from which the fine powder 4 has been removed. The outer cylinder 20 is raised from the outer surface of the upper surface of the base plate 40, and the lower opening of the outer cylinder 20 (the lower opening of the lower cylindrical portion 22) is closed by the base plate 40.

  The inner cylinder 10 has a discharge port 13a at its lower end, a first inflow pipe 60 connected to the upper side wall, and a second inflow pipe 120 connected to the lower side wall of the first inflow pipe 60. The columnar space 10 </ b> A is formed, and the outer cylinder 20 forms an annular space 20 </ b> A in which the outflow pipe 70 is connected to the lower side wall around the columnar space 20 </ b> A below the first inflow pipe 60. Of the side walls of the filter 30 and the lower cylinder portion 13 which are the side walls of the inner cylinder 10 at the boundary between the columnar space 20A and the annular space 20A, the side wall of the filter 30 is columnar space by a number of filter holes 31 provided therein. 10A and the annular space 20A are connected in communication, and the side wall of the lower cylindrical portion 13 blocks ventilation between the columnar space 10A and the annular space 20A.

  Next, assembly of the fine powder removing device of the present embodiment will be described.

  As shown in FIGS. 1 and 2, the lower cylinder portion 13 of the inner cylinder 10 and the lower cylinder portion 22 of the outer cylinder 20 are integrally provided on the base plate 40. When assembling the fine powder removing device of the present embodiment, the flange 30a provided at the lower end of the side wall of the filter 30 is overlaid on the flange 13b provided at the upper end of the side wall of the lower cylinder portion 13 of the inner cylinder 10, and The filter 30 is placed on the lower cylinder portion 13.

  Further, the upper cylinder portion 21 of the outer cylinder 20 is placed on the flange 22a provided at the upper end of the side wall of the lower cylinder portion 22 of the outer cylinder 20 via the ring-shaped lower packing 80, and the upper cylinder of the outer cylinder 20 is placed. A ring-shaped flange 82 is superposed on the portion 21 via a ring-shaped upper packing 81, and the upper tube portion 21 of the outer cylinder 20 is sandwiched between the flanges 82, 22a via upper and lower packings 81, 80.

  The flange 12 a provided to project outward from the vicinity of the lower end of the side wall of the upper cylinder portion 12 of the inner cylinder 10 is overlaid on the flange 82, and the lower end of the side wall of the upper cylinder portion 12 of the inner cylinder 10 is placed inside the upper opening of the filter 30. Fit. At this time, the filter 30 is sandwiched between the flange 12 a of the upper cylinder portion 12 of the inner cylinder 10 and the lower cylinder portion 13 of the inner cylinder 10. Further, the upper cylinder portion 21 of the outer cylinder 20 is sandwiched between the flange 12a of the upper cylinder portion 12 of the inner cylinder 10 and the lower cylinder portion 22 of the outer cylinder 20, and the upper opening of the outer cylinder 20 (the upper cylinder portion 21). The upper opening) is closed by the flange 12a of the upper cylinder portion 12 of the inner cylinder 10.

  A plurality of bolts 83 having male threads at both ends are passed through the flange 82 and passed between the flanges 12a and 22a, and nuts 84 are screwed onto the upper ends of the bolts 83 protruding upward from the upper surface of the flange 12a. A nut 84 is screwed to the lower end of each bolt 83 projecting downward from the lower surface of 22a, and the upper tube portion 12 of the inner tube 10 is connected to the lower tube portion 13 of the inner tube 10 and the lower tube portion 22 of the outer tube 20. tighten. At this time, in order to prevent the upper cylinder portion 21 of the outer cylinder 20 and the filter 30 from being deformed or cracked due to excessive tightening, each bolt 83 is provided with a cylindrical spacer 85 sandwiched between the flanges 12a and 22a. It is fitted.

  An outer portion of the upper lid 50 is placed on the flange 12b provided at the upper end of the side wall of the upper cylinder portion 12 of the inner cylinder 10, and a ring-shaped presser plate 86 is overlaid on the outer portion of the upper lid 50, thereby clamping the clamp band. The upper lid 50 is fixed to the flange 12b by 87 or the like, and the upper opening of the inner cylinder 10 (the upper opening of the upper cylinder portion 12) is closed by the upper lid 50 to complete.

  Thereby, filter replacement | exchange can be performed by removing the upper cylinder part 12 of the inner cylinder 10. FIG. Moreover, when washing | cleaning a fine powder removal apparatus, the lower cylinder part 13 of the inner cylinder 10, the lower cylinder part 22 of the outer cylinder 20, the integral part of the baseplate 40, the filter 30, and the upper cylinder part 12 of the inner cylinder 10 And the upper cylinder portion 21 of the outer cylinder 20.

  Next, the material of the fine powder removing apparatus of this embodiment will be described.

  Materials such as the inner cylinder 10, the outer cylinder 20, the base plate 40, and the upper lid 50 including the filter 30 may be metals such as general structural steel plates and stainless steel plates. At this time, it is preferable to use a transparent material such as acrylic, polycarbonate, or glass for the upper cylinder portion 21 and the upper lid 50 of the outer cylinder 20.

  Thereby, the flow 8 of the air 1 mixed with the fine powder 4 flowing spirally in the annular space 20 </ b> A through the outer cylinder 20 from the outside of the fine powder removing device can be visually confirmed. Further, the flow 6 of the air-fuel mixture 3 flowing spirally in the columnar space 10 </ b> A through the upper lid 50 from above the fine powder removing device, particularly the flow 6 of the air-fuel mixture 3 flowing spirally along the inner wall of the filter 30. It can be confirmed visually. Thus, the entire inside of the fine powder removing device can be seen through the upper cylinder portion 21 and the upper lid 50 of the outer cylinder 20 from the outside of the fine powder removing device, and the processing status of the fine powder removing device can be confirmed.

  Next, the use of the fine powder removing apparatus of this embodiment will be described.

  As shown in FIG. 3, the fine powder removing apparatus of the present embodiment is included in the pellet 2 before supplying the plastic resin pellet (which may be a chip) 2 as a raw material for plastic resin molding to the molding machine 90. In order to remove the fine powder 4 of the plastic resin, it is used by being installed vertically (may be installed obliquely) on the upper part of the raw material supply hopper 91 of the molding machine 90 via the base plate 40. At this time, the storage tank 92 for the pellet 2 is connected to the first inflow pipe 60 via a hose or a pipe, and the blower 93 which is a fluid device that gives kinetic energy to the air 1 or increases the pressure to the outflow pipe 70. Connect the suction port of the unit via a hose or pipe. A dust collector 94 is provided between the outflow pipe 70 and the blower 93.

  Here, a Y-shaped pipe 124 is provided in the middle of the transport pipe 123 connecting the storage tank 92 and the first inflow pipe 60, and the branch pipe 126 branched from the transport pipe 123 by the Y-shaped pipe 124 is connected to the second pipe 126. By connecting to the inflow pipe 120, a part 1 a of the air 1 for transporting the pipes of the pellet 2 is made to flow from the second inflow pipe 120. The branch pipe 126 is provided with an air filter (passing only air 1a) 127 and a flow rate adjusting valve 128.

  The flow rate adjustment valve 128 reduces the flow rate of the air 1a flowing in from the second inflow tube 120 than the flow rate of the air 1 flowing in from the first inflow tube 60. Since the flow rate from the connection port 124a of the storage tank 92 to the connection port 124b of the first inflow pipe 60 and the connection port 124c of the second inflow pipe 120 can be changed by the angle 125, the Y-shaped pipe 124 also has the first inflow. It can be used as a flow rate adjusting means for reducing the flow rate of the air 1a flowing in from the second inflow tube 120 than the flow rate of the air 1 flowing in from the tube 60.

  Next, the operation of the fine powder removing apparatus of this embodiment will be described.

  When the blower 93 connected to the outflow pipe 70 is driven, suction-type piping transportation is started. By this suction-type piping transportation, as shown in FIGS. 4 and 5, the air-fuel mixture 3 (including the fine powder 4) of the air 1 and the pellets 2 passes through the first inflow pipe 60 and passes through the inner cylinder 10. Into the upper cylindrical portion 12 (upper part of the columnar space 10A) from the side wall thereof, descends while turning along the inner wall of the upper cylindrical portion 12 of the inner cylinder 10 and the filter 30 (in the columnar space 10A). It enters the upper and lower intermediate part) and descends while turning along the inner wall of the filter 30. At this time, a part 1 a of the air 1 for transporting the pipes of the pellets 2 passes through the second inflow pipe 120 and enters the lower cylinder portion 13 (lower part of the columnar space 10 </ b> A) of the inner cylinder 10 from the side wall in the tangential direction. The swirl airflow 9 having the same swirling direction as the flow 6 of the air-fuel mixture 3 flowing spirally along the inner wall of the filter 30 while swirling along the inner wall of the lower cylinder portion 13 of the inner cylinder 10 It is formed in the lower cylinder part 13. The swirling air flow 9 entrains the flow 6 of the air-fuel mixture 3 flowing spirally along the inner wall of the filter 30 and brings the flow 6 of the air-fuel mixture 3 closer to the swirling flow into a spiral with a smaller lead angle.

  Here, a portion of the side wall of the inner cylinder 10 that overlaps the second inflow pipe 120 in the axial direction of the central axis 11 of the inner cylinder 10 is blocked by the side wall of the lower cylinder portion 13 of the inner cylinder 10. An annular space 20 </ b> A that is a non-ventilated air-blocking portion, and in which the air 1 a that has flowed in from the second inflow pipe 120 is located around the outer wall of the lower part of the columnar space 10 </ b> A (side wall of the lower tube portion 13 of the inner tube 10) Since the strong swirling airflow 9 can be formed in the lower part of the columnar space 10A (inside the lower cylinder part 13) of the columnar space 10A without leaking to the lower part, the flow 6 of the air-fuel mixture 3 flowing spirally along the inner wall of the filter 30 is It becomes a spiral with a smaller lead angle.

  Further, a portion of the side wall of the inner cylinder 10 that overlaps the outflow pipe 70 in the axial direction of the central axis 11 of the inner cylinder 10 is a non-porous ventilation for blocking the ventilation by the side wall of the lower cylinder portion 13 of the inner cylinder 10. It serves as a stop, and the air 1 and 1a in the lower part of the columnar space 10A inside the annular wall 20A is not sucked from the inner wall (the side wall of the lower cylinder part 13 of the inner cylinder 10) below the annular space 20A. The outflow pipe 70 has a pipe side wall 73 that enters the lower part of the annular space 20A so as to form an inlet 71 that enters the lower part of the annular space 20A. Since the intake air in the opposite direction can be reduced and a stronger swirling airflow can be formed, the flow 6 of the air-fuel mixture 3 flowing spirally along the inner wall of the filter 30 has a spiral shape with a smaller lead angle. That.

  The filter hole 31 provided in the side wall of the filter 30 is a long hole whose length direction is a direction perpendicular to the central axis 11 of the inner cylinder 10. On the other hand, centrifugal force is acting on the air-fuel mixture 3 that flows spirally along the inner wall of the filter 30. For this reason, the filter hole 31 moves the pellet 2 in the air-fuel mixture 3 along the upper and lower sides in the length direction of the filter hole 31, and the flow 6 of the air-fuel mixture 3 flowing spirally along the inner wall of the filter 30 is It becomes a spiral with a smaller lead angle.

  While the air-fuel mixture 3 flows in a spiral shape with a small lead angle along the inner wall of the filter 30, the pellet 2 and the fine powder 4 in the air-fuel mixture 10 are separated from the filter 30 by the action of centrifugal force generated in the flow 6. Separated inside and outside the side wall. The pellet 2 larger than the filter hole 31 does not pass through the filter hole 31 and stops inside the side wall of the filter 30, and the fine powder 4 smaller than the filter hole 31 passes through the filter hole 31 and is separated outside the side wall of the filter 30. At this time, since there is a flow 7 of air 1 that passes through the filter hole 31 from the inside to the outside of the side wall of the filter 30, the pellet 2 and the fine powder 4 can be easily separated.

  The fine powder 4 separated to the outside of the side wall of the filter 30, that is, the annular space 20 </ b> A, swirls down and reaches the lower part of the annular space 20 </ b> A by the flow 8 of the air 1 flowing spirally there, passes through the outflow pipe 70, It flows out from the side wall of the lower cylinder part 22 of the outer cylinder 20 in the tangential direction. That is, it flows out of the outer cylinder 20. The fine powder 4 contained in the air 1 flowing out of the outer cylinder 20 is collected by the dust collector 94, and clean air 1 is released from the discharge port of the blower 93 into the atmosphere.

  While descending while turning along the inner wall of the filter 30, the pellet 2 from which the fine powder 4 has been removed enters the lower cylinder portion 13 (lower part of the columnar space 10 </ b> A) of the inner cylinder 10, and the lower cylinder portion of the inner cylinder 10. 13, descends while turning along the inner wall of the inner cylinder 10, reaches a discharge port 13 a which is a lower opening of the lower cylinder portion 13 of the inner cylinder 10, and is discharged from there to a raw material supply hopper 91 of the molding machine 90. Of course, while descending while turning along the inner wall of the filter 30, dust passing through the filter hole 31, small pieces of plastic resin, and the like are removed as foreign matter together with the fine powder 4.

  Thus, the fine powder removing apparatus of the present embodiment can continuously process the pellet 2 and remove foreign matters such as the fine powder 4 from the pellet 2. In the present embodiment, the air-fuel mixture 3 is introduced from the first inflow pipe 60, and a part 1a of the air 1 for transporting the pellets 2 from the second inflow pipe 120 is introduced (this form is changed). However, the air-fuel mixture 3 may be introduced from the second inflow pipe 120 and a part 1a of the air 1 for transporting the pipe 2 of the pellet 2 may be introduced from the first inflow pipe 60 ( This form is β). In this case, the flow rate of the air 1a flowing in from the first inflow tube 60 is made smaller than the flow rate of the air 1 in the air-fuel mixture 3 flowing in from the second inflow tube 120. Further, the transport pipe 123 on the downstream side of the Y-shaped pipe 124 is switched and connected to the first inflow pipe 60 and the second inflow pipe 120, and at the same time, the branch pipe 126 on the downstream side of the flow rate adjustment valve 128 is connected to the first inflow pipe. A flow path switching valve that switches between the second inflow pipe 120 and the first inflow pipe 60 that are not connected to the inflow pipe 60 may be provided to switch between α and β.

  As mentioned above, according to the present Example, there exist the following effects.

  A second inflow pipe 120 through which the air 1a for generating the swirling airflow is introduced into the inner cylinder 10 is provided, and along the inner wall of the filter 30 by the air 1a introduced into the inner cylinder 10 from the second inflow pipe 120. By forming a swirl airflow 9 having the same swirl direction as the flow 6 of the airflowing mixture 3, the swirl airflow 9 entrains the flow 6 of the mixture 3 flowing spirally along the inner wall of the filter 30. Since the flow 6 of the air-fuel mixture 3 is made close to the swirl flow and has a spiral shape with a small lead angle, the shape of the apparatus can be designed freely, and the residence time on the filter surface of the air-fuel mixture 3 can be increased to remove the fine powder 4. Efficiency can be increased.

  By making the flow rate of the air 1a flowing in from the second inflow tube 120 smaller than the flow rate of the air 1 in the air-fuel mixture 3 flowing in from the first inflow tube 60, the air flows in from the second inflow tube 120. It is possible to prevent the air 1a from obstructing the inflow of the air-fuel mixture 3 from the first inflow pipe 60.

  A portion of the side wall of the inner cylinder 10 that overlaps the second inflow pipe 120 in the axial direction of the central axis 11 of the inner cylinder 10 is non-porous for blocking airflow by the side wall of the lower cylinder portion 13 of the inner cylinder 10. By using the ventilation stopper, the air 1a introduced from the second inflow pipe 120 leaks from the outer wall of the columnar space 10A lower part (side wall of the lower cylinder part 13 of the inner cylinder 10) to the lower part of the annular space 20A around it. Since a strong swirling airflow 9 can be formed in the lower part of the columnar space 10A (in the lower cylinder portion 13) of the columnar space 10A, the flow 6 of the air-fuel mixture 3 flowing spirally along the inner wall of the filter 30 is more reed angle. Therefore, the shape of the apparatus can be designed freely, and the residence time of the air-fuel mixture 3 on the filter surface can be made longer and the removal efficiency of the fine powder 4 can be further increased.

  A portion of the side wall of the inner cylinder 10 that overlaps the outflow pipe 70 in the axial direction of the central axis 11 of the inner cylinder 10 is a non-perforated ventilation stopper for blocking ventilation by the side wall of the lower cylinder part 13 of the inner cylinder 10. As a result, the air 1 and 1a in the lower part of the columnar space 10A on the inner side (the side wall of the lower cylinder part 13 of the inner cylinder 10) is not sucked from the inner wall at the lower part of the annular space 20A, and is illustrated in the lower part of the annular space 20A. In addition, the outflow pipe 70 has a pipe side wall 73 that enters the lower part of the annular space 20A so as to form an inlet 71 that enters the lower part of the annular space 20A. Since the intake air in the reverse direction can be reduced and a stronger swirling airflow can be formed, the flow 6 of the air-fuel mixture 3 flowing spirally along the inner wall of the filter 30 has a spiral shape with a smaller lead angle. The shape of the device can be freely designed, moreover can be further increased efficiency of removing fines 4 residence time in the filter surface of the mixture 3 made longer.

  The filter hole 31 of the filter 30 is a long hole whose length direction is a direction perpendicular to the central axis 11 of the inner cylinder 10, so that the filter hole 31 allows the pellet 2 in the air-fuel mixture 3 to be longer than the filter hole 31. Since the flow 6 of the air-fuel mixture 3 that moves along the upper and lower sides in the vertical direction and flows spirally along the inner wall of the filter 30 has a spiral shape with a smaller lead angle, the shape of the apparatus can be designed freely. The residence time of the air-fuel mixture 3 on the filter surface can be made longer, and the removal efficiency of the fine powder 4 can be further increased.

  FIG. 6 is a view showing a modified structure of the second inlet of the fine powder removing apparatus of the first embodiment. The second inflow pipe 120 shown in FIGS. 1 to 5 is provided at a right angle to the central axis 11 of the inner cylinder 10, and in the inflow direction of the air 1 a flowing in from the second inflow pipe 120, the second inflow pipe 120 shown in FIG. The axial component of the central axis 11 of the cylinder 10 is not included. That is, the second inflow pipe 120 allows the air 1a to flow in a direction perpendicular to the central axis 11 of the inner cylinder 10 (horizontal direction when the central axis 11 of the inner cylinder 10 is a vertical line). As shown in FIG. 4, the second inflow pipe 120 is connected to the inner cylinder 10 so that the center of the inlet 121A that opens to the outside of the outer cylinder 20 is lower than the center of the outlet 122A that opens along the side wall of the inner cylinder 10. An inclination angle θ is given to the central axis 11, and an upward component that is an axial component of the central axis 11 of the inner cylinder 10 is included in the inflow direction of the air 1 a flowing in from the second inflow pipe 120. Is preferred. As a result, the air 1 a flowing in from the second inflow pipe 120 having the inclination angle θ rises while swirling along the inner wall of the filter 30 to form a spiral swirl airflow 9 </ b> A, and along the inner wall of the filter 30. Since the flow 6 of the spiral mixture 3 that descends while swirling is made into a spiral with a smaller lead angle, the shape of the apparatus can be designed freely, and the residence time of the mixture 3 on the filter surface can be made longer. Thus, the removal efficiency of the fine powder 4 can be further increased. In this case, if the lead angle of the swirling airflow 9A is large, the flow 6 of the air-fuel mixture 3 may be disturbed, or the flow 6 of the air-fuel mixture 3 may be merged and cannot be entrained. The inclination angle θ of the tube 120 is preferably 1 degree or more and 10 degrees or less, which is sufficiently smaller than the lead angle of the flow 6 of the air-fuel mixture 3, and more preferably 1 degree or more and 5 degrees or less.

  FIG. 7 is a view showing another air supply means to the second inlet of the fine powder removing apparatus of the first embodiment. Instead of supplying a part 1a of air 1 that is a transport gas of pellet 2 as a gas for generating a swirl airflow to second inflow pipe 120, as shown in FIG. You may supply the air 1 as gas for generation | occurrence | production of a swirl | vortex airflow by this exclusive piping system. This dedicated piping system connects the discharge port of the blower 93 </ b> A for generating the swirling airflow to the second inflow pipe 120 via the air supply pipe 126, and the second inflow pipe 120 passes through the air supply pipe 126. A flow rate adjustment valve 128 </ b> A is provided to reduce the flow rate of the air 1 that flows in from the flow rate of the air 1 that flows in from the first inflow pipe 60. Further, it is preferable to provide a filter 127A for removing foreign matters such as dust contained in the air 1 in the air supply pipe 126 upstream or downstream of the flow rate adjustment valve 128A. A gas other than air 1 such as nitrogen gas or carbon dioxide gas may be supplied as the gas for generating the swirling airflow.

  The fine powder removing apparatus according to the second embodiment will be described with reference to FIGS. FIG. 8 is a diagram showing the overall configuration of the fine powder removing apparatus of Example 2, FIG. 9 is a diagram showing the appearance of the fine powder removing apparatus of Example 2, (A) is a front view, (B) is a plan view, C) is a side view, FIG. 10 is a side view showing the flow of air in the fine powder removing apparatus of Example 2, and FIG. 11 is a plan view showing the flow of air in the fine powder removing apparatus of Example 2. (A) is a plan view showing the flow of air at the inlet, (B) is a plan view showing the flow of air at the separation part, (C) is a plan view showing the flow of air at the outlet. is there.

  The fine powder removing apparatus of the present embodiment is the same as the fine powder removing apparatus of the first embodiment except that the installation position in the axial direction of the central axis 11 of the inner cylinder 10 of the second inflow pipe is different from the fine powder removing apparatus of the first embodiment. It has the same structure, the same code | symbol is attached | subjected to the same structure, and detailed description is abbreviate | omitted.

  As shown in FIGS. 8 to 11, the gas 1 a or 1 for generating the swirling airflow is introduced into the inner cylinder 10 in the tangential direction from the side wall of the inner cylinder 10, and along the inner wall of the filter 30 by the gas 1 a or 1. A second inflow pipe 120A is provided as a second inlet for forming a swirling airflow 9B having the same swirling direction as the flow 6 of the air-fuel mixture 3 flowing spirally. The second inflow pipe 120 </ b> A supplies the swirling air flow generating gas 1 a or 1 from the side wall lower than the first inflow pipe 60 in the axial direction of the central axis 11 of the inner cylinder 10 among the side walls of the inner cylinder 10. Among the side walls of the inner cylinder 10, the inner cylinder 10 is provided on the side wall below the first inflow pipe 60 in the axial direction of the central axis 11 so as to flow into the inner cylinder 10 in the tangential direction. Specifically, it is provided on the side wall of the upper and lower intermediate portion (filter 30) of the inner cylinder 10. The second inflow pipe 120A is a straight pipe and penetrates the side wall of the upper part (upper cylinder part 21) of the outer cylinder 20, and the inlet 121A in the second inflow pipe 120A is formed in a circular shape. Opened to the top outside. The outlet 122A of the second inflow pipe 120A is formed in a rectangular shape, and the outlet 122A is opened along the side wall of the upper and lower intermediate portion (filter 30) of the inner cylinder 10.

  When the blower 93 or 93A connected to the outflow pipe 70 is driven, the air 1a or 1 for generating the swirling airflow passes through the second inflow pipe 120A as shown in FIGS. The air-fuel mixture 3 flows into the inside (upper and lower middle parts of the columnar space 10A) from the side wall in a tangential direction and flows spirally along the inner wall of the filter 30 while turning along the inner wall of the filter 30 of the inner cylinder 10 A swirling airflow 9B having the same swirling direction as the flow 6 is formed in the filter 30 of the inner cylinder 10. The swirl airflow 9B entrains the flow 6 of the air-fuel mixture 3 flowing spirally along the inner wall of the filter 30, and the flow 6 of the air-fuel mixture 3 is brought close to the swirl flow to form a spiral with a smaller lead angle. Note that the second inflow pipe 120A of the present embodiment may be provided with an inclination angle θ as in the first embodiment.

  The fine powder removing apparatus according to the third embodiment will be described with reference to FIGS. FIG. 12 is a diagram showing the overall configuration of the fine powder removing apparatus of Example 3, FIG. 13 is a side view showing the flow of air in the fine powder removing apparatus of Example 3, and FIG. 14 is in the fine powder removing apparatus of Example 3. It is a top view which shows the flow of air of (A), (A) is a top view which shows the flow of air in an inflow port part, (B) is a top view which shows the flow of air in a separation part, (C) is an outflow port It is a top view which shows the flow of the air in a part.

  The fine powder removing apparatus of the present embodiment is obtained by adding a central tube 100 and a filter cover 110 to the fine powder removing apparatus of the first embodiment, and has all the configurations of the fine powder removing apparatus of the first embodiment.

  As shown in FIGS. 12 to 14, the center cylinder 100 is configured such that its upper end is detachably fixed to the inner surface of the upper lid 50 and is coaxially inserted from the inner surface of the upper lid 50 into the inner cylinder 10. 10 has a cylindrical portion 101 parallel to the upper cylindrical portion 12, a truncated cone portion 102 parallel to the side wall of the filter 30, and a closed end portion 103 on the truncated cone portion 102 side. It is arranged between the upper opening and the lower opening, and the columnar space 10A above the closed end 103 is formed in the annular space 10B. The air-fuel mixture 3 flowing in the tangential direction from the side wall of the upper cylinder portion 12 through the first inflow pipe 60 descends while turning along the inner wall of the upper cylinder portion 12 of the inner cylinder 10 and is filtered. 30, and descends while swirling along the inner wall of the filter 30, but the swirling inner diameter at that time is regulated by the side wall of the central cylinder 100, and the air-fuel mixture 3 easily flows spirally along the inner wall of the filter 30. ing.

  The filter cover 110 is provided between the side wall of the outer cylinder 20 and the side wall of the filter 30 as a ventilation suppression unit that suppresses the amount of air 1 that passes through the filter hole 31 from the inside to the outside of the side wall of the filter 30. . The filter cover 110 has a cylindrical shape, and a flange 111 provided in the upper opening is sandwiched between the flange 12 a and the flange 82, so that it is coaxial with the inner cylinder 10 and between the side wall of the outer cylinder 20 and the side wall of the filter 30. And covers at least the upper part of the side wall of the filter 30. The length of the side wall of the filter cover 110 (the area covering the side wall of the filter 30), the diameter (the distance between the side wall of the filter cover 110 and the side wall of the filter 30), and the shape (the presence or absence of holes, the degree of opening ratio) The amount of air 1 passing through the filter hole 31 from the inside to the outside of the filter 30 is optimized, the necessary amount of air 1 is secured in the filter 30, and the air-fuel mixture 3 spirals along the inner wall of the filter 30. The velocity of the flow 6 is not reduced during the flow. That is, the centrifugal force generated in the flow 6 of the air-fuel mixture 3 flowing spirally along the inner wall of the filter 30 is not reduced, and the reduction in the removal efficiency of the fine powder 4 is prevented.

  By the way, in this embodiment, when the outflow pipe 70 is rotated around the central axis 11 of the inner cylinder 10 with a radius from the central axis 11 of the inner cylinder 10 to the center of the first inflow pipe 60, the inner cylinder 10. The flow 6 of the air-fuel mixture 3 flowing spirally along the inner wall of the filter 30 without overlapping the first inflow pipe 60 when viewed in the axial direction of the central axis 11 of the The flow 8 of air 1 mixed with fine powder 4 flowing spirally between the side wall and the side wall of the lower cylinder part 13 and the side wall of the outer cylinder 20 (the side wall of the upper cylinder part 21 and the side wall of the lower cylinder part 22) Although swirling in the same direction, the swirling direction of both flows 6 and 8 can be reversed by providing the outflow pipe 70 so as to overlap the first inflow pipe 60. Here, the swirl direction is opposite to the flow 6 of the air-fuel mixture 3 flowing spirally along the inner wall of the filter 30, and the side wall of the inner cylinder 10 (the side wall of the filter 30 and the side wall of the lower cylinder portion 13) and the outer The flow 8 of air 1 mixed with fine powder 4 spirally flowing between the side wall of the cylinder 20 (the side wall of the upper cylinder part 21 and the side wall of the lower cylinder part 22) is outside from the inside of the side wall of the filter 30 through the filter hole 31. Since the air curtain suppresses the amount of air 1 passing through the filter cover 110, the air curtain can be used as an air flow suppressing means instead of the filter cover 110.

  The fine powder removing apparatus according to the fourth embodiment will be described with reference to FIGS. FIG. 15 is a diagram showing the overall configuration of the fine powder removing apparatus of Example 4, FIG. 16 is a diagram showing the appearance of the fine powder removing apparatus of Example 4, (A) is a front view, (B) is a plan view, C) is a side view, FIG. 17 is a side view showing the flow of air in the fine powder removing apparatus of Example 4, and FIG. 18 is a plan view showing the flow of air in the fine powder removing apparatus of Example 4. (A) is a plan view showing the air flow at the separation part, (B) is a plan view showing the air flow at the outlet part, (C) is a plan view showing the air flow at the inlet part. is there.

  As shown in FIGS. 15 and 16, the fine powder removing device of the present embodiment includes an inner cylinder 140 including a filter 130, an outer cylinder 150 arranged coaxially on the outer side of the inner cylinder 140, and a stand for installing the fine powder removing device. A plate 160, an upper lid 170, and the like are included.

  The filter 130 has the same structure and function as the filter 30 of the first, second, and third embodiments. Of the side wall of the inner cylinder 140, at least a part of a portion overlapping the side wall of the outer cylinder 150 in the axial direction of the central axis 141 of the inner cylinder 140 is formed, and the air-fuel mixture 3 that flows into the inner cylinder 140 (FIG. 17, FIG. 18) for separating the fine powder 4 from the plastic resin pellet 2 (an example of a granular material) in the outside of the side wall of the inner cylinder 140. When the central axis 141 of the inner cylinder 140 is a vertical line, A large number of filters that are formed in a truncated cone shape that narrows downward in the vertical direction and allow only the air 1 and fine powder 4 in the air-fuel mixture 3 to pass through substantially the entire side wall (side surfaces) (the pellet 2 does not pass). The holes 131 are arranged in a staggered pattern. The side wall of the filter 130 is made of punching metal.

  Each filter hole 131 has the same structure and function as the filter holes 31 of the first, second, and third embodiments. The flow 6A of the air-fuel mixture 3 that flows spirally along the inner wall (filter surface) of the filter 130 is In order to guide in a direction perpendicular to the central axis 141 of the inner cylinder 140 (horizontal direction when the central axis 141 of the inner cylinder 140 is a vertical line), the length direction is a direction perpendicular to the central axis 141 of the inner cylinder 140. It is formed in a long hole.

  The inner cylinder 140 has a large truncated cone shape, which is narrowed downward vertically when the central axis 141 is a vertical line, and is composed of three parts, an upper part, a middle part, and a lower part. The middle part and the lower part are constituted by a truncated cone-shaped middle cylinder part 142 and a lower cylinder part 143, respectively. The outer cylinder 150 has a two-piece structure of a cylindrical upper cylinder part 151 and a lower cylinder part 152 having substantially the same diameter, and the lower cylinder part 152 has a bottom plate 152a. Among the coaxially arranged inner cylinder 140 and outer cylinder 150, the inner cylinder 140 is raised from the base plate 160 at a right angle, and the outer cylinder 150 is arranged around the filter 130 and the middle cylinder portion 142 of the inner cylinder 140. The lower cylinder part 152 of the inner cylinder 140 protrudes downward from the center part of the bottom plate 152a, and the upper opening of the inner cylinder 140 (upper opening of the filter 130) and the upper opening of the outer cylinder 150 are aligned at substantially the same height position. (Upper opening of the upper cylinder portion 151) is closed by the upper lid 170.

  In the side wall of the lower part (lower cylinder part 143) of the inner cylinder 140 projecting downward from the bottom plate 152a of the outer cylinder 150, an inflow port (a first inlet) through which the air-fuel mixture 3 flows tangentially into the inner cylinder 140 Inflow pipe 180 (hereinafter referred to as “first inflow pipe”). The inlet 181 in the first inflow pipe 180 is formed in a circular shape, and the outlet 182 is formed in a circular shape (which may be rectangular). The outlet 182 extends along the side wall of the lower portion of the inner tube 140 (the lower tube portion 143). (See FIG. 18C).

  A gas 1a (see FIGS. 17 and 18A) for generating a swirling airflow is introduced into the inner cylinder 140 in a tangential direction from the side wall of the inner cylinder 140, and mixed by the gas 1a to flow spirally along the inner wall of the filter 130. A second inflow pipe 220 serving as a second inflow port for forming a swirling airflow 9C (see FIGS. 17 and 18A) having the same swirling direction as the flow 3A of the air 3 is provided. The second inflow pipe 220 circulates the gas 1 a for generating the swirling airflow from the side wall of the inner cylinder 140 in the axial direction of the central axis 141 of the inner cylinder 140 from the side wall above the first inflow pipe 180. Among the side walls of the inner cylinder 140, the inner cylinder 140 is provided on the side wall above the first inflow pipe 180 in the axial direction of the central axis 141. Specifically, it is provided on the side wall of the upper part (filter 130) of the inner cylinder 140 (in some cases, the side wall of the upper and lower intermediate part (filter 130) of the inner cylinder 140). The second inflow pipe 220 is a straight pipe and penetrates the side wall of the upper part (upper cylinder part 151) of the outer cylinder 150, and the inlet 221 in the second inflow pipe 220 is formed in a circular shape. Opened to the top outside. The outlet 222 in the second inflow pipe 220 is formed in a rectangular shape, and the outlet 222 is opened along the side wall of the upper portion (filter 130) of the inner cylinder 140 (see FIG. 18A).

Among the side walls of the outer cylinder 150, the outer cylinder 150 that overlaps the side wall of the middle part (middle cylinder part 142) of the inner cylinder 140 below the filter 130 of the inner cylinder 140 in the axial direction of the central axis 141 of the inner cylinder 140. On the side wall of the lower part (lower cylinder part 152), air 1 mixed with fine powder 4 (from each of the filter holes 131 and from the inner cylinder 140 to the side wall of the inner cylinder 140 (the side walls of the filter 130 and the middle cylinder part 142) ) And the side wall of the outer cylinder 20 (the side wall of the upper cylinder part 151 and the side wall of the lower cylinder part 152), the air 1) mixed with the fine powder 4 flowing into the annular space 150A flows out of the outer cylinder 150 in the tangential direction. An outflow pipe 190 serving as an outflow port is provided. The outflow pipe 190 is a straight pipe, and both the inlet 191 and the outlet 192 in the outflow pipe 190 are formed in a circular shape. The outflow pipe 190 is an annular space 150A between the side wall of the inner cylinder 140 and the side wall of the outer cylinder 150, and the lower part of the annular space 150A between the middle side wall of the inner cylinder 140 and the lower side wall of the outer cylinder 150. In order to form the inlet 191 which entered, it has the pipe | tube side wall 193 which entered the annular space 150A lower part between the side wall of the inner part of the inner cylinder 140, and the lower side wall of the outer cylinder 150 (refer FIG. 18B). .
In this embodiment, there are gaps between the outflow pipe 190 and the side wall of the outer cylinder 150 (outer wall of the annular space 150A) and between the outflow pipe 190 and the bottom plate 152a (the bottom surface of the outer cylinder 150: the bottom surface of the annular space 20A). However, it is preferable that these are not present. Although the circular opening shape of the inlet 191 of the outflow pipe 190 is shown, it may be circular or rectangular. The inlet 191 of the outflow pipe 190 is rectangular and preferably has no gap between the side wall of the outer cylinder 150 and the bottom plate 152a.

  A circular through hole 161 having substantially the same diameter as the lower opening of the inner cylinder 140 (lower opening of the lower cylinder part 143) is provided at the center of the base plate 160. The inner cylinder 140 is an edge of the through hole 161 of the base plate 160. The lower opening of the inner cylinder 140 is opened to the lower surface side of the base plate 160 to form a discharge port 143a for the pellet 2 from which the fine powder 4 has been removed.

  The inner cylinder 140 has a discharge port 143a at its lower end, a first inflow pipe 180 connected to the lower side wall, and a second inflow pipe 220 connected to the upper side wall of the first inflow pipe 180. A funnel-shaped space 140A is formed, and the outer cylinder 150 forms an annular space 150A around the funnel-shaped space 140A above the first inflow pipe 180 and having an outflow pipe 190 connected to the lower side wall. Of the side wall of the filter 130 and the side wall of the middle cylinder portion 142 which are the side walls of the inner cylinder 140 at the boundary between the funnel-shaped space 140A and the annular space 150A, the side wall of the filter 130 is funneled by a number of filter holes 131 provided therein. 140A and the annular space 150A are connected in communication, and the side wall of the middle cylindrical portion 142 blocks ventilation between the funnel-shaped space 140A and the annular space 150A.

  Next, assembly of the fine powder removing device of the present embodiment will be described.

  As shown in FIGS. 15 and 16, the middle tube portion 142, the lower tube portion 143, and the lower tube portion 152 of the outer tube 150 are integrally provided on the base plate 160. When assembling the fine powder removing device of the present embodiment, the flange 130a provided at the lower end of the side wall of the filter 130 is overlaid on the flange 142a provided at the upper end of the side wall of the middle cylindrical portion 142 of the inner cylinder 140. The filter 130 is placed on the middle tube portion 142.

  Further, the upper cylinder portion 151 of the outer cylinder 150 is placed on the flange 152b provided at the upper end of the side wall of the lower cylinder portion 152 of the outer cylinder 150 via the ring-shaped lower packing 200, and the upper cylinder of the outer cylinder 150 is placed. A ring-shaped upper packing 201 is placed on the portion 151, and the upper lid 170 is placed on the inner cylinder 140 and the outer cylinder 150. At this time, the filter 130 is sandwiched between the upper lid 170 and the middle cylinder portion 142 of the inner cylinder 140. Further, the upper cylinder portion 151 of the outer cylinder 150 is sandwiched between the upper lid 170 and the lower cylinder portion 152 of the outer cylinder 150 via the upper and lower packings 201 and 200. The upper opening of the inner cylinder 140 (upper opening of the filter 130) and the upper opening of the outer cylinder 150 (upper opening of the upper cylinder portion 151) are integrally closed by the upper lid 170.

  A plurality of bolts 202 having male screws at both ends are passed between the upper lid 170 and the flange 152b, and nuts 203 are screwed onto the upper ends of the bolts 202 protruding upward from the upper surface of the upper lid 170, and downward from the lower surface of the flange 152b. A nut 203 is screwed onto the lower end of each bolt 202 projecting to the top, and a filter 130 is attached to the middle cylinder part 13 of the inner cylinder 140 by an upper lid 170, and an upper cylinder part 130 is attached to the lower cylinder part 152 of the outer cylinder 150. Tighten to complete. At this time, in order to prevent the upper lid 170, the filter 130 of the inner cylinder 140, the upper cylinder portion 151 of the outer cylinder 150 from being deformed or cracked due to excessive tightening, each bolt 202 has a gap between the upper lid 170 and the flange 152b. A cylindrical spacer 204 to be sandwiched is externally fitted.

  Thereby, the filter can be replaced by removing the upper lid 170. Further, when cleaning the fine powder removing device, etc., an integral part of the inner tube portion 142, the lower tube portion 143, the outer tube 150, the lower tube portion 152 and the base plate 160 of the inner tube 140, the filter 130, and the outer tube 150 Can be disassembled into an upper cylinder portion 151 and an upper lid 170.

  Next, the material of the fine powder removing apparatus of this embodiment will be described.

  Materials such as the inner cylinder 140, the outer cylinder 150, the base plate 160, and the upper lid 170 including the filter 130 may be metals such as general structural steel plates and stainless steel plates. At this time, it is preferable to use a transparent material such as acrylic, polycarbonate, or glass for the upper tube portion 151 of the outer tube 150. It is more preferable to use a transparent material for the upper lid 170 as well.

  Thereby, the flow 8A of the air 1 mixed with the fine powder 4 flowing spirally in the annular space 150A through the outer cylinder 150 from the outside of the fine powder removing device can be visually confirmed. Further, the flow 6A of the air-fuel mixture 3 flowing spirally in the funnel-shaped space 140A through the upper lid 170 from above the fine powder removing device, in particular, the flow 6A of the air-fuel mixture 3 in the filter 130 can be visually confirmed. In this way, the entire inside of the fine powder removing device can be seen through the upper cylinder portion 151 and the upper lid 170 of the outer cylinder 150 from the outside of the fine powder removing device, and the processing status of the fine powder removing device can be confirmed.

  Next, the use of the fine powder removing apparatus of this embodiment will be described.

  The fine powder removing device of the present embodiment is installed in the molding machine 90 instead of the fine powder removing devices of the first, second, and third embodiments, and the first inflow pipe 180 is connected to the storage tank 92 of the pellet 2 via a hose or a pipe. The second inflow pipe 220 is connected to the end of the branch pipe 126 branched from the transport pipe 123 connecting the storage tank 92 and the first inflow pipe 60, and the outflow pipe 190 is given kinetic energy to the air 1. Connected to the suction port of the blower 93, which is a fluid device that increases the pressure, through a hose or pipe, and treats each unit of pellet 2 by batch processing, and removes foreign matter such as fine powder 4 from the pellet 2. . When the fine powder removing device of this embodiment is installed in the molding machine 90, the raw material supply hopper 91 is removed, and the connecting port is vertically installed through the base plate 160 (may be installed obliquely). A dust collector 94 is provided between the outflow pipe 190 and the blower 93.

  Next, the operation of the fine powder removing apparatus of this embodiment will be described.

  When the blower 93 connected to the outflow pipe 190 is driven, suction-type piping transportation is started. As a result of this suction-type piping transportation, as shown in FIGS. 17 and 18, the air-fuel mixture 3 (containing fine powder 4) of air 1 and pellets 2 passes through the first inflow pipe 180 and the inner cylinder 140. Flows into the lower cylinder part 143 (lower part of the funnel-shaped space 140A) from the side wall there, rises while turning along the inner wall of the lower cylinder part 143 of the inner cylinder 140, and enters the middle cylinder part 142 The filter 130 (upper part of the funnel-shaped space 140 </ b> A) rises while turning along the inner wall of the middle cylinder part 142, rises while turning along the inner wall of the filter 130, and reaches the upper lid 170. At this time, a part 1 a of the air 1 for transporting the pipe of the pellet 2 passes through the second inflow pipe 220 and flows into the filter 130 of the inner cylinder 140 (upper part of the columnar space 140A) from the side wall in the tangential direction. Then, a swirling airflow 9C having the same swirling direction as the flow 6A of the air-fuel mixture 3 flowing spirally along the inner wall of the filter 130 while swirling along the inner wall of the filter 130 of the inner cylinder 140 enters the filter 130 of the inner cylinder 140. Form. The swirling airflow 9C entrains the flow 6 of the air-fuel mixture 3 that flows spirally along the inner wall of the filter 130, and brings the flow 6 of the air-fuel mixture 3 closer to the swirling flow into a spiral with a smaller lead angle.

  Here, a portion of the side wall of the inner cylinder 140 that overlaps the outflow pipe 190 in the axial direction of the central axis 141 of the inner cylinder 140 is a non-hole for blocking airflow by the side wall of the inner cylinder portion 142 of the inner cylinder 140. It is a ventilation stopper, and the air 1, 1a in the upper and lower middle parts of the funnel-like space 140A inside the annular space 150A is not sucked from the inner wall (the side wall of the middle cylinder part 142 of the inner cylinder 140). Since a strong swirling air flow (not shown) can be formed in the lower portion of the space 150A, and the outflow pipe 190 has a pipe side wall 193 that enters the lower portion of the annular space 150A so as to form an inlet 191 that enters the lower portion of the annular space 150A. Since the intake air in the direction opposite to the swirling direction of the air can be reduced and a stronger swirling airflow can be formed, the mixing flows spirally along the inner wall of the filter 130. 3 of flow 6A becomes more of a lead angle small spiral.

  The filter hole 131 provided in the side wall of the filter 130 is a long hole whose length direction is a direction perpendicular to the central axis 141 of the inner cylinder 140. On the other hand, centrifugal force is acting on the air-fuel mixture 3 that flows spirally along the inner wall of the filter 130. For this reason, the filter hole 131 moves the pellet 2 in the air-fuel mixture 3 along the upper and lower sides in the length direction of the filter hole 131, and the flow 6A of the air-fuel mixture 3 flowing spirally along the inner wall of the filter 130 is It becomes a spiral with a smaller lead angle.

  When the second inflow pipe 220 is provided on the side wall of the upper and lower intermediate portion (filter 130) of the inner cylinder 140, the second inflow in the axial direction of the central axis 141 of the inner cylinder 140 out of the side walls of the inner cylinder 140. The portion overlapping the tube 120 is a non-porous air-blocking portion for blocking airflow by the side wall of the middle tube portion 142 of the inner tube 140, and the air 1a introduced from the second inflow tube 220 is funnel-shaped. There is no leakage from the outer wall of the space 140A upper and lower intermediate portion (side wall of the middle tube portion 142 of the inner tube 140) to the lower portion of the annular space 150A around it, and the upper and lower middle portion of the funnel-shaped space 140A (inside the middle tube portion 13 of the inner tube 140) Therefore, the flow 6A of the air-fuel mixture 3 flowing spirally along the inner wall of the filter 130 has a spiral shape with a smaller lead angle.

  Then, one unit of the air-fuel mixture 3 stays in the filter 130 while swirling along the inner wall of the filter 130 until the drive of the blower 93 is stopped. During this period, the mixture 3 flows spirally along the inner wall of the filter 130. The pellet 2 and the fine powder 4 in the air-fuel mixture 3 are separated on the inner and outer sides of the side wall of the filter 130 by the action of the centrifugal force generated in the flow 6 </ b> A of the air 3. The pellet 2 larger than the filter hole 131 stops inside the filter 130 without passing through the filter hole 131, and the fine powder 4 smaller than the filter hole 131 passes through the filter hole 131 and is separated to the outside of the filter 130 side wall. At this time, since there is a flow 7A of air 1 that passes from the inside to the outside of the side wall of the filter 130 at the filter hole 131, the pellet 2 and the fine powder 4 can be easily separated.

  The fine powder 4 separated from the side wall of the filter 130, that is, the annular space 150A, descends while swirling by the flow 1A of the air 1 flowing spirally there, reaches the lower portion of the annular space 150A, passes through the outflow pipe 190, It flows out in the tangential direction from the side wall of the lower cylinder portion 152 of the outer cylinder 150. That is, it flows out of the outer cylinder 150. The fine powder 4 contained in the air 1 flowing out of the outer cylinder 150 is collected by the dust collector 94, and clean air 1 is discharged into the atmosphere from the discharge port of the blower 93.

  While swirling along the inner wall of the filter 130 and staying in the filter 130, the pellet 2 from which the fine powder 4 has been removed falls by stopping the drive of the blower 93, and the lower part of the lower cylinder part 143 of the inner cylinder 140. It is discharged to the molding machine 90 from the discharge port 143a which is an opening. Of course, while staying while swirling along the inner wall of the filter 130, dust passing through the filter hole 131, small pieces of plastic resin, and the like are removed as foreign matter together with the fine powder 4. When one unit of fine powder removal processing is completed, the blower 93 starts to be driven, and the next one unit of fine powder removal processing is performed.

  Thus, the fine powder removing apparatus of the present embodiment and the fine powder removing apparatus of the reference example process each pellet 2 in a unit by batch processing, and remove foreign matters such as the fine powder 4 from the pellet 2.

  In the batch processing, the residence time of the pellet 2 on the inner wall of the filter 130 is determined by the driving time (suction time) of the blower 93. Therefore, in the fine powder removing apparatus of this embodiment, the presence / absence of the second inflow pipe 220 and the lower part of the annular space 150A There is no difference in residence time due to the strength of the swirling airflow and the shape of the filter hole 131, but as a modified structure of the fine powder removing device of this embodiment, a discharge port for discharging the processed pellet 2 is provided at the upper part of the device, There is a type (continuous processing type) in which the pellets 2 to be processed are inserted from the lower part of the apparatus and the processed pellets 2 are extracted from the upper part of the apparatus. In the case of this type, the removal time of the fine powder 4 can be increased by increasing the residence time of the air-fuel mixture 3 on the filter surface.

  As described above, the present embodiment has the same effects as the first and second embodiments.

  Also in the fine powder removing apparatus of the present embodiment, the second inflow pipe 220A may be provided with an inclination angle θ as in the first embodiment. Further, the air 1 as the gas for generating the swirling airflow may be supplied to the second inflow pipe 220 </ b> A by a dedicated pipe system different from the pipe transportation of the pellet 2. Furthermore, the center tube 100 and the filter cover 110 added by the fine powder removing apparatus of the second embodiment can be added.

  As described above, in the first to fourth embodiments, the present invention has been described with the fine powder removing apparatus applied to the well-known suction-type pipeline transportation of the granular material. However, the present invention is not limited thereto, and the scope of the present invention is not deviated. Various modifications can be made. For example, the present invention can be applied to the well-known pressure-feed type pipe transportation of granular materials, and can also be applied to pipe transportation using nitrogen gas or carbon dioxide gas as a transport gas. In addition, in Examples 1 to 4, the present invention has been described with an apparatus that transports one type of granular material and removes fine powder. However, a plurality of types of granular material are transported and mixed to form fine powder. It is applicable also to the apparatus which removes.

  In addition, in order to form a spiral flow inside and outside the filter side wall, both the tangential direction of the connection direction of the mixed gas inflow pipe (first inflow pipe) and the fine powder mixed air outflow pipe to the cylindrical side wall. It is not necessary to provide either one, and it is sufficient as long as it is different with respect to the axial position of the central axis of the inner cylinder of the inflow pipe of mixture gas and the outflow pipe of air mixed with fine powder. Even if they do not overlap at all in the axial direction of the central axis of the inner cylinder, they may overlap. In the case of the fourth embodiment, the axial position of the central axis of the inner cylinder of the inflow pipe for the air-fuel mixture and the outflow pipe for the air mixed with fine powder may be the same. The filter may be a well-known filter provided with a filter hole on the side wall that does not have an air-fuel mixture guide function. Further, the filter hole may not be a long hole. Further, the filter hole allows the free flow of the air-fuel mixture flowing spirally along the inner wall of the filter to be perpendicular to the central axis of the inner cylinder from a direction closer to the central axis of the inner cylinder than the free flow direction. It may be a long hole guiding in one direction up to the direction. In this case, the filter hole is formed in a long hole whose length direction is the guide direction.

1 Air (transport gas)
2 Pellet (powder)
3 Mixture 4 Fine powder 10,140 Inner cylinder 11, 141 Center axis 20 150 Outer cylinder 30, 130 Filter 31, 131 Filter hole 60, 180 First inlet pipe (first inlet)
70, 190 Outflow pipe (outlet)
120, 220 Second inlet pipe (second inlet)
9, 9A, 9B, 9C Swirl airflow

Claims (5)

  An inner cylinder and an outer cylinder arranged outside the inner cylinder, and at least a portion of the side wall of the inner cylinder that overlaps the side wall of the outer cylinder in the axial direction of the central axis of the inner cylinder is a porous filter. In addition, an inlet is provided in the inner cylinder for allowing a mixture of the particulate transport gas and the particulate to flow in, and the side wall of the filter is disposed along with the fine powder contained in the mixture flowing into the inner cylinder. In the fine powder removing apparatus provided with an outlet for allowing the transporting gas passing therethrough to flow out of the outer cylinder, a second inlet for allowing a gas for generating a swirling airflow to flow into the inner cylinder is provided, and the second inlet is provided. The fine powder removing device, wherein the swirling air flow having the same swirling direction as the flow of the air-fuel mixture flowing spirally along the inner wall of the filter is formed by the gas that has flowed into the inner cylinder from the inside.   The fine powder removing apparatus according to claim 1, wherein the second inflow port is provided below the inflow port.   The fine powder removing apparatus according to claim 1, wherein the second inflow port is provided above the inflow port.   4. The flow rate of the gas flowing in from the second inflow port is made smaller than the flow rate of the transport gas in the air-fuel mixture flowing in from the inflow port. 5. The fine powder removing apparatus according to item.   The fine powder removing apparatus according to any one of claims 1 to 4, wherein an inflow direction of the gas introduced from the second inflow port includes an upward component.

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