JP5401392B2 - Fine powder removal device - Google Patents

Description

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

  An example of a conventional fine powder removing device will be described with reference to FIG. 6. A powder and particle separation unit 101 in which a center pipe 111 and a casing 112 are arranged substantially concentrically and a filter pipe 113 is inserted between them is a three-layer structure. The cylindrical portion of the cap 114 installed at the upper portion is provided with a tangential powder suction port 115, the lower portion of the casing 112 is provided with a tangential air suction port 117, and the shutter 122 is provided at the lower portion. It installs in the upper part of the storage tank 121 provided in. By driving the suction blower connected to the air suction port 117, the powder body is sucked together with air from the end of the tube connected to the powder body suction port 115. The air-fuel mixture including the granular material flowing in the tangential direction from the granular material suction port 115 enters between the center pipe 111 and the filter pipe 113 from the upper part of the granular material separating unit 101 and moves downward. During this time, the granular material and the fine powder accompanying it are separated. The separated fine powder passes through the filter hole together with air, travels downward between the filter pipe 113 and the casing 112, and is discharged from the air suction port 117. The granular material from which the fine powder has been removed is discharged from the lower end opening of the filter pipe 113 to the storage tank 121 without passing through the filter hole.

JP 2009-273969 A

  In the above conventional fine powder removing device, since the mixture of powder and gas is introduced from the top of the device, there is a limit in the residence time of the powder in the device, and depending on the powder, the fine powder removal efficiency due to insufficient residence time in the device There is a problem that becomes extremely low.

  The present invention has been made in view of the above problems, and its purpose is to arbitrarily set the residence time of the granular material in the apparatus, and to ensure the residence time in the apparatus necessary for removing fine powder, which varies depending on the granular material. It is an object of the present invention to provide a fine powder removing device that can always remove the dust with high efficiency.

  In order to achieve the above object, the present invention provides a cylindrical casing, a cylindrical filter disposed in the casing, a transport gas for granular material, and an inlet for allowing the granular material to flow into the filter, In the fine powder removing apparatus having an outlet for allowing the transport gas and fine powder that have passed through the filter to flow out in a tangential direction from between the casing and the filter, the filter has an inverted conical surface about the center line of the casing. The inflow port is characterized in that the granular material and the transport gas flow in a tangential direction from the lower part of the filter. With this configuration, the transport gas flows in a tangential direction from the inflow port. In the filter, an air flow is generated from the lower part to the upper part while turning along the inner surface of the inverted conical filter. As long as the air flow is present, the particles stay in the filter.

  According to the present invention, it is possible to arbitrarily set the residence time of the granular material in the apparatus, to ensure the residence time required for the removal of the fine powder, which varies depending on the granular material, and to always remove the fine powder with high efficiency. A removal device can be provided.

  In the present invention, when the filter is provided with a configuration in which a filter part having a large number of filter holes is provided at the upper part, a strong air flow can be generated in the filter without escaping the transport gas from the lower part of the filter to the outside. Accordingly, fine powder can be efficiently separated at the upper part of the filter on which centrifugal force acts greatly. In this case, when a configuration in which a cylindrical cover is installed around the outer periphery of the lower part of the filter unit, more transport gas escapes outward from the upper part of the lower part of the filter unit, so that a stronger air flow is generated in the filter. Accordingly, the granular material and the fine powder can be more efficiently separated at the upper portion of the filter portion where the centrifugal force acts more greatly.

  In the present invention, when the configuration is such that the transport gas and fine powder that have passed through the filter flow out in a tangential direction from between the lower part of the casing and the lower part of the filter, the outlet exits while rotating between the casing and the filter. An airflow directed in the direction is generated, and the transport gas and fine powder that have passed through the filter flow out from the lower outlet.

  In the present invention, when the configuration is such that the transport gas and fine powder that have passed through the filter flow out in a tangential direction from between the upper part of the casing and the upper part of the filter, the outlet is swirled between the casing and the filter. An airflow directed in the direction is generated, and the transport gas and fine powder that have passed through the filter flow out from the upper outlet.

It is side explanatory drawing which shows Example 1 of the fine powder removal apparatus concerning this invention. It is upper surface explanatory drawing which shows Example 1 of the fine powder removal apparatus concerning this invention. It is a figure which shows the use condition of Example 1 of the fine powder removal apparatus concerning this invention. It is side explanatory drawing which shows Example 2 of the fine powder removal apparatus concerning this invention. It is side explanatory drawing which shows Example 3 of the fine powder removal apparatus concerning this invention. It is side explanatory drawing which shows an example of the conventional fine powder removal apparatus.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a fine powder removing apparatus according to the present invention will be described based on examples together with the drawings.

  FIG. 1 is an explanatory side view showing Example 1 of a fine powder removing apparatus according to the present invention, and FIG. 2 is an explanatory top view showing Example 1 of the fine powder removing apparatus according to the present invention. As shown in FIG. 1 and FIG. 2, in the fine powder removing apparatus of Example 1, a cylindrical filter 4 is disposed in a cylindrical casing 3 in which an upper opening is closed by an upper lid 1 and a lower opening is closed by a bottom plate 2. The filter 4 is in an inverted conical surface with the center line of the casing 3 in the axial direction (the vertical direction in FIG. 1) as an axis, and is formed in an inverted frustoconical shape. The upper opening is closed by the upper lid 1 and the lower end portion. Passes through the bottom plate 2 and is drawn out to the lower side of the casing 3, and the lower opening serves as the discharge port 6 of the granular material 5. The discharge port 6 is provided with a damper 7 that can be rotated (opened / closed) about a support shaft 7a.

  The cylindrical portion of the casing 3 and the filter 4 are divided into two upper and lower portions on one plane perpendicular to the axis thereof, and the upper portion of the filter 4 in the upper cylindrical portion 3a of the casing 3 is made of punching metal or a metal net. The filter part 4a having a large number of filter holes 8 is formed, and the lower part of the filter 4 in the lower cylindrical part 3b shorter than the upper cylindrical part 3a of the casing 3 is made of a non-breathable metal plate, and the non-filter part 4b To do.

  In addition, the non-filter part 4b penetrates the lower cylindrical part 3b from the outside of the lower cylindrical part 3b into the non-filter part 4b, and transports the transport gas 9 of the granular substance 5 and the granular substance 5 in the tangential direction. A short pipe-like inlet 10 is provided for inflow, and an annular space between the lower cylindrical portion 3b and the non-filter portion 4b is provided in the lower cylindrical portion 3b with the transport gas 9 and fine powder 11 that have passed through the filter hole 8 of the filter portion 4a. In addition, a short tangential pipe-like outlet 12 is provided to flow out of the lower cylindrical portion 3b from a height position approaching the bottom plate 2.

  FIG. 3 is a diagram illustrating a usage state of the first embodiment of the fine powder removing apparatus according to the present invention. As shown in FIG. 3, the fine powder removing apparatus of Example 1 is generated during a resin molding, such as a molding failure, included in a resin material (resin pellet), or in a suction-type pipeline transportation process to a molding machine. In order to remove the fine powder and foreign matters to be removed, it is installed on the upper part of the resin material supply popper 14 of the molding machine 13, and the discharge port 6 is opened to the resin material supply popper 14 via the damper 7. The inflow port 10 is connected by piping to a storage tank 15 of the resin material 5 that is a granular material, and the outflow port 12 is connected by piping to the suction port of a blower 16 that is a fluid device that gives kinetic energy to a gas or increases pressure. . There is a dust collector 17 between the outlet 12 and the blower 16.

  Operation | movement of the fine powder removal apparatus of Example 1 is demonstrated.

  When the resin material 5 is not contained in the storage tank 15, when the blower 16 is driven, the air in the annular space between the lower cylindrical portion 3b and the non-filter portion 4b flows out from the outlet 12 in the tangential direction, and the lower cylindrical portion 3b Air in the annular space between the upper cylindrical portion 3a and the filter portion 4a flows into the annular space between the non-filter portions 4b, and the annular space between the upper cylindrical portion 3a and the filter portion 4a is inside the filter portion 4a. Air flows in from the filter hole 8, air in the non-filter portion 4b flows into the filter portion 4a, and a damper 7 is freely opened in the non-filter portion 4b from the discharge port 6 opened. The air inside the resin material supply popper 14 flows in, and at the same time, the air inside and outside the storage tank 15 flows from the inlet 10, but when the air begins to flow into the outlet 6, the damper 7 is closed by the airflow. , Discharge Because 6 is closed, the inside of the non-filter portion 4b is air in and out of the storage tank 15 flows from the inlet port 10 in the tangential direction.

  The air flowing in from the inlet 10 in the tangential direction generates an upward spiral air flow 18 (spiral indicated by a solid line in FIG. 1) from the bottom to the top while swirling along the inner surface of the inverted conical filter 4 inside the filter 4. In the annular space between the casing 3 and the filter 4, a downward spiral airflow 19 (spiral indicated by a broken line in FIG. 1) is generated while turning, until the spiral airflows 18 and 19 stop driving the blower 16. Maintained.

  Therefore, when the resin material 5 is contained in the storage tank 15, suction-type pipe transportation (pneumatic transportation) is performed, and the resin material 5 is brought into the inlet 10 together with the air (transport gas) 9 inside and outside the storage tank 15. Since the spiral air flow 18 that flows upward in the tangential direction is generated inside the filter 4, the resin material 5 that flows in the tangential direction together with the air 9 from the inlet 10 flows into the filter 4 due to the upward spiral air flow 18. The resin material 5 stays in the filter 4 as long as there is a spiral airflow 18, that is, until the drive of the blower 16 is stopped.

  At this time, the resin material 5 and the fine powder 11 contained in the resin material 5 or generated in the suction-type pipe transportation process to the molding machine 13 and the like are separated by centrifugal force. Fine powder 11 and foreign matter smaller than the filter hole 8 pass through the filter hole 8 together with the air 9 flowing into the annular space between the upper cylindrical portion 3a and the filter portion 4a from the inside of the filter portion 4a, and the annular shape between the casing 3 and the filter 4 It merges with the downward spiral air flow 19 generated in the space, turns downward while turning, and flows out tangentially from the outlet 12 together with the air 9. That is, it is discharged out of the apparatus. Fine powder 11 and foreign matter contained in the air 9 discharged outside the apparatus are collected by the dust collector 17, and clean air 9 is discharged from the discharge port of the blower 16 to the atmosphere.

  Then, when the residence time in the apparatus appropriately set by the resin material 5 (the time required for removing the fine powder 11 and the foreign matter depending on the resin material 5) has elapsed, the drive of the blower 16 is stopped, and thus the filter 4 until then. Since the spiral airflows 18 and 19 generated inside and outside are eliminated, the resin material 5 forcedly retained in the filter 4 by the upward spiral airflow 18 falls by its own weight, and at the same time the damper 7 is opened. Therefore, the cleaner resin material 5 from which the fine powder 11 and the foreign matter are removed with high efficiency targeted is discharged from the discharge port 6. In other words, it is discharged to the resin material supply popper 14 outside the apparatus and put into the molding machine 13. Therefore, it is possible to suppress molding defects due to mixing of the fine powder 11 and foreign matter into the resin material 5 during resin molding.

  As described above, in the fine powder removing apparatus according to the first embodiment, the filter 4 is in the inverted conical surface with the center line of the casing 3 as an axis, and the inlet 10 tangentially passes the resin material 5 and the air 9 from the lower part of the filter 4. The air 9 flowing in the tangential direction from the inflow port 10 causes the upward flow of the spiral air flow 18 from the lower part to the upper part while turning along the inner surface of the inverted conical filter 4. Since the resin material 5 stays in the filter 4 as long as the spiral air flow 18 exists, the residence time of the resin material 5 in the apparatus can be arbitrarily set, and the residence time in the apparatus necessary for removing the fine powder 11 and the foreign matters which differ depending on the resin material 5 The fine powder 11 and the foreign matter can always be removed with high efficiency.

  Further, the filter 4 is provided with a filter portion 4 a having a large number of filter holes 8 in the upper portion, thereby generating a strong upward spiral air flow 18 in the filter 4 without letting the air 9 escape from the lower portion of the filter 4 to the outside. Accordingly, the fine powder 11 and the foreign matter can be efficiently separated at the upper part of the filter 4 where the centrifugal force acts greatly.

  FIG. 4 is a side explanatory view showing Example 2 of the fine powder removing apparatus according to the present invention. As shown in FIG. 4, the fine powder removing device of Example 2 has the same configuration and function as the fine powder removing device of Example 1 except that a cylindrical cover 20 is installed around the lower outer periphery of the filter portion 4a. The same parts as those in the fine powder removing apparatus of the first embodiment are denoted by the same reference numerals.

  The cover 20 is made of a non-breathable metal plate, is in an inverted conical surface with the center line in the axial direction of the casing 3 (up and down direction in FIG. 4) as an axis, is formed in an inverted frustoconical shape, and has an upper end and a lower end. The same gap is provided between the filter unit 4a and the filter unit 4a.

  In the fine powder removing apparatus according to the second embodiment, more air is released to the outside in the upper part where the cover 20 is not present than in the lower part of the filter part 4 a where the cover 20 is present on the outer side, and thus a stronger upward spiral air flow 18 is generated in the filter 4. Accordingly, the fine powder 11 and the foreign matter can be more efficiently separated at the upper part of the filter unit 4 where the centrifugal force acts more greatly.

  Here, the air 9 and the fine powder 11 and the foreign matter that have passed through the upper part of the filter part 4a without the cover 20 on the outside are generated downward on the upper part of the filter part 4a, on the outer side of the cover 20, and on the outer side of the non-filter part 4b. It merges with the spiral air flow 19 and flows out from the outlet 12 in the tangential direction. Air 9, fine powder 11 and foreign matter also pass through the lower part of the filter part 4 a having the cover 20 on the outside, and flow into the annular space between the cover 20 and the filter part 4 a, but a downward spiral airflow is also generated there. The air 9, the fine powder 11, and the foreign matter that have passed through the lower part of the filter part 4 a and flowed into the annular space between the cover 20 and the filter part 4 a merge into the downward spiral airflow generated there, It flows out into the annular space between the lower cylindrical portion 3b and the non-filter portion 4b through the gap between the lower end of the filter portion 4a, merges with the downward spiral airflow 19 generated there, and flows out from the outlet 12 in the tangential direction.

  The cover 20 is installed in parallel with the filter unit 4a in FIG. 4, but the inclination is such that the gap between the cover 20 and the filter unit 4a is larger at the lower end than the upper end of the cover 20, or the gap is eliminated at the upper end of the cover 20. It may be installed in a cylindrical shape parallel to the outer upper cylindrical portion 3a so as to eliminate such a tilt or a gap at the upper end of the cover 20.

  FIG. 5 is a side explanatory view showing Example 3 of the fine powder removing apparatus according to the present invention. In the fine powder removing apparatus of the first and second embodiments, the air 9, the fine powder 11 and the foreign matter that have passed through the filter 4 are tangent between the lower part of the casing 3 (lower cylindrical part 3b) and the lower part of the filter 4 (non-filter part 4b). The outlet 12 is provided tangentially to the lower portion of the casing 3 so as to flow out in the direction, whereas in the fine powder removing device of Example 3 as shown in FIG. The fine powder 11 and the foreign matter are allowed to flow out in a tangential direction between the upper portion of the casing 3, preferably the uppermost portion (the uppermost portion of the upper cylindrical portion 3a) and the upper portion of the filter 4, preferably the uppermost portion (the uppermost portion of the filter portion 4a). Thus, the point that the outflow port 12a is provided in the tangential direction with respect to the upper part of the casing 3, preferably the uppermost part is greatly different, and the embodiment is implemented in that a cylindrical cover 20 is installed around the lower part of the lower part of the filter part 4a. Example 2 Is the same as the fine powder removal device.

  Moreover, since the outflow port 12a is provided in the tangential direction with respect to the upper part of the casing 3, the casing 3 has a lower cylindrical portion so that an annular space between the upper part of the casing 3 and the upper part of the filter 4 is expanded radially outward. The upper cylindrical portion 30a has a diameter larger than 3b, and a ring-shaped step plate 30c that blocks the step surface between the upper cylindrical portion 30a and the lower cylindrical portion 3b having different diameters.

  Also, an outer ring-shaped upper collar portion 20a is provided at the upper end of the cover 20 so as to close the gap between the upper cylindrical portion 30a and the outlet 12a, and the lower end of the cover 20 is provided with the lower end of the filter portion 4a. A ring-shaped lower collar portion 20b that closes the gap (the upper end of the non-filter portion 4b) is provided, and an annular outflow space 30 having a tangential outflow port 12a is formed on the upper portion of the casing 3, preferably the uppermost portion. The upper part of the annular space closed between the cover 20 and the filter part 4 a is connected to the outflow space 30.

  In the fine powder removing apparatus according to the third embodiment, the air 9, the fine powder 11, and the foreign matter that have passed through the upper part of the filter unit 4 a that does not have the cover 20 on the outside directly flow into the outflow space 30 and join the swirling airflow 19 a generated therein. , Flows out tangentially from the outlet 12a. Air 9, fine powder 11 and foreign matter also pass through the lower part of the filter part 4 a having the cover 20 on the outside and flow into the annular space between the cover 20 and the filter part 4 a, but an upward spiral airflow is generated there. Therefore, the air 9, the fine powder 11, and the foreign matter that have passed through the lower part of the filter unit 4 a and flowed into the annular space between the cover 20 and the filter unit 4 a merge into the upward spiral airflow generated there, and enter the outflow space 30. It flows in, merges with the swirling airflow 19a generated there, and flows out tangentially from the outlet 12a.

  In addition to the above, the fine powder removing apparatus of Example 3 has the same configuration and function as the fine powder removing apparatus of Examples 1 and 2, and the same parts as those of the fine powder removing apparatus of Examples 1 and 2 are denoted by the same reference numerals. It is. In addition, the casing 3 may be configured such that the step plate 30c is eliminated by matching the diameter of the lower cylindrical portion 3b with the diameter of the upper cylindrical portion 30a.

  As described above, in the present embodiment, the present invention has been described with the fine powder removing device applied to the well-known suction-type pipeline transportation of the granular material. However, the present invention is not limited thereto, and various modifications can be made without departing from the scope of the present invention. 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 the pipe transportation using nitrogen gas or carbon dioxide gas as a transport gas. Further, in the present embodiment, the present invention has been described with an apparatus that transports one type of powder and removes fine powder, but transports and mixes multiple kinds of powder and removes fine powder. The present invention can also be applied to an apparatus that performs the above.

3 Casing 4 Filter 4a Filter section 5 Resin material (powder)
8 Filter hole 9 Air (transport gas)
10 Inlet 11 Fine powder 12 Outlet 12a Outlet 20 Cover

Claims (5)

A cylindrical casing;
A cylindrical filter disposed in the casing;
An inflow port for flowing a granular material transport gas and the granular material into the filter;
In the fine powder removing apparatus provided with an outlet for allowing the transport gas and fine powder that have passed through the filter to flow out in a tangential direction from between the casing and the filter,
The filter is in an inverted conical plane about the casing centerline;
The fine powder removing apparatus, wherein the inlet allows the granular material and the transport gas to flow in a tangential direction from a lower part of the filter. In the fine powder removal apparatus according to claim 1,
A fine powder removing device, wherein the filter is provided with a filter portion having a large number of filter holes in an upper part. The fine powder removing apparatus according to claim 2,
A fine powder removing apparatus, characterized in that a cylindrical cover is installed around the lower outer periphery of the filter section. In the fine powder removal apparatus according to any one of claims 1 to 3,
A fine powder removing device characterized in that the outflow outlet causes the transport gas and fine powder that have passed through the filter to flow out in a tangential direction from between the lower part of the casing and the lower part of the filter. In the fine powder removal apparatus according to any one of claims 1 to 3,
A fine powder removing device characterized in that the outflow outlet causes the transport gas and fine powder that have passed through the filter to flow out in a tangential direction from between the upper part of the casing and the upper part of the filter.

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