JP6363908B2 - Metal powder removal unit - Google Patents

Description

The present invention prevents the generation of static electricity while removing the metal powder when the powder material is put into a fluid hopper by suction pneumatic transportation, stirred and mixed, or when the stored powder is discharged. In addition, the present invention relates to a metal powder removing unit for preventing the material from being classified when discharged.

The prior art will be described with reference to FIG. Conventionally, as a method for removing foreign substances from granular material, an introduction pipe 22 for receiving the granular material transported by suction air is provided at the lower part of the hopper shown in Patent Document 1, and the granular material from the transported air is provided at the upper end of the hopper. There is known a fluid hopper provided with a separation part 18 for separating the material and provided with a discharge port for discharging the granular material at the lower end part. Such a fluid hopper separates foreign substances such as fine powder and dust from the particulate material at the separation part by fluidly stirring the particulate material transported by air in the fluid hopper by an air flow action. In this fluid hopper, granular materials with different bulk densities flow, dust with low bulk density flows out of the system together with air, and those with high bulk density are separated by falling into the fluid hopper. To do. Therefore, in the case of dust such as metal powder with a small difference in bulk density, it may not be sufficiently separated only by flow.

Therefore, when removing the metal powder in the foreign matter, a unit for removing the metal powder using the magnet 100 shown in Patent Document 2 is widely implemented. These are often used in a round bar shape in which a plurality of magnets 100 are used and a yoke is sandwiched to increase the efficiency of magnetic lines of force. A plurality of these round bar shapes are arranged in the same direction and installed near the lower portion of the flow hopper, a space through which the powder particles pass is provided, and the metal particles are removed by passing the powder particles therebetween. However, this invention is effective for removing metal powder, but after mixing different materials with a fluid hopper, or after storing with the material mixed in the container, in the case of a container where the discharge part is tapered at the time of discharge, When discharging mixed powder particles having different shapes, there is a problem that the powder particles that are difficult to flow are separated from those that have a large outflow resistance, and those that are easy to flow and have a small outflow resistance, and the ones that are easy to flow out. Furthermore, when the material is introduced from the lower part, the metal powder separator combined with the round bar-shaped magnet 100 disturbs the air flow, the air resistance increases, and the stirring and mixing in the fluid hopper is not sufficiently performed. There was a problem.

Due to suction transportation or flow agitation to the fluid hopper, the material was charged with static electricity, and a material that was easily charged with static electricity when discharged was attached to the wall surface of the fluid hopper. For this reason, the mixed material is charged with static electricity when discharged, and the material adhering to the wall surface is left behind, resulting in a problem that the mixing ratio changes.

Furthermore, when the material mixed in the fluid hopper is discharged from the lower part of the fluid hopper, the material near the center of the outlet is preferentially discharged, and the upper material is directed toward the center to compensate for the discharged material. It is known to show an outflow mode that moves horizontally. When this granular material moves horizontally, frictional force acts between the granular materials, the material that flows easily moves first, and the material that does not easily move stagnates, so that there is a problem that separation of the mixed material occurs.

JP-A-11-197480 JP 2006-341212 A

The present invention has been made in view of the above situation, and when discharging the granular material from a container or a fluid hopper, the metal powder that is a foreign object is removed from the granular material and the material is replaced, or the adhered metal When cleaning powder, make it easy to clean and do not separate the mixed materials when discharging. It is another object of the present invention to prevent adhesion of the powder material on the inner wall surface due to static electricity generated during fluid mixing or pneumatic transportation, so that the mixed material does not separate during discharge.

In order to achieve the above object, as a first means, the metal powder removing unit of the granular material according to the present invention includes a straight body portion in which an upper side portion storing the granular material is substantially cylindrical, and a lower portion side. In a container having a tapered portion having a substantially inverted conical portion and a discharge pipe for discharging the granular material at the lower end portion of the tapered portion, a conical shape on the upper portion, which is installed on the tapered portion, a lower portion And a support material for containing a magnet inside and obtaining a gap with the tapered portion. It is a metal powder removal unit for granular materials.

The metal powder removal unit is electrically connected to the container made of a conductive material as a second means through the support member and the surface portion of the metal powder removal unit made of the conductive material, The metal powder for the granular material according to the first means, wherein the generated static electricity is moved by contacting the metal powder removal unit and the container, and the static electricity is discharged to the outside. It is a removal unit.

The container has, as a third means, an introduction pipe that receives the particulate material that is pneumatically transported to the side surface of the discharge pipe, and an air suction port that is connected to a suction air source at the upper end of the straight body portion at the top of the container. An installed canopy, and a separation unit that separates the granular material from the transport air ,
The granular material charged from the introduction pipe flows upward through the discharge pipe, through the gap, and repeatedly rises and falls while the suction air source operates, so that the metal powder 3. The metal powder removing unit for a granular material according to claim 1, wherein the metal powder removing unit is installed in the tapered portion so as to repeat contact with the removing portion .

As a fourth means, the container is provided with a discharge pipe at the lower end of the tapered portion whose lower part is substantially inverted conical, and is connected to the discharge pipe so that it has a certain gap and is concentrically outward longer than the discharge pipe. A canopy in which an air inlet is provided at the upper end of the straight body of the container, and a granular material from the transport air The apparatus according to any one of the first to second means, characterized in that it is a powder particle flow apparatus provided with a separation part for separating the material, and is installed in a tapered part below the flow hopper. This is a metal powder removing unit for a granular material.

The metal powder removal unit of the granular material according to the present invention can be mass flow discharged by installing it in the tapered part of the container storing the mixed material, and the gap between the tapered part and the metal powder removal unit. The metal powder could be removed efficiently. In addition, the flow hopper is configured as described above, so that the powder material is brought into contact with the metal powder removal unit many times during the flow stirring while the fluid material is pneumatically transported and flowed. Since the material is discharged out of the fluid hopper system, the powder mixed material is controlled by the metal powder removal unit controlling the flow when the particulate material is discharged, and suppressing the adhesion of the particulate material to the inner wall surface of the fluid hopper It became possible not to classify when discharging. Further, when the material is changed, the metal powder removing unit is fixed to the flow hopper of the granular material only by its own weight and the frictional force of the support member, so that it can be easily removed and cleaned.

The front external view a of a metal powder removal unit and the external view b seen from the lower part are shown. The front external view when a metal powder removal unit is installed in the container which stores a granular material is shown. The modification of the support member of a metal powder removal unit is shown. The external view when the metal powder removal unit is installed in the fluid hopper is shown. The system block diagram which showed typically an example of the transportation system of the granular material material provided with the fluid hopper of the granular material is shown. The external view when the metal powder removal unit is installed in the modification of a fluid hopper is shown. The external appearance front view of the fluid hopper which attached the metal powder removal apparatus of a prior art is shown.

The best mode for carrying out the present invention will be described below with reference to the drawings. In addition, this invention is not limited by this embodiment. Further, in the description of the present embodiment, the same reference numerals are given to the same configurations and the effects and the same description is not repeated.

(A) of FIG. 1 shows the external shape of the front of the metal powder removal unit 1 of this invention, (b) shows the external shape seen from the C direction of (a). The metal powder removing unit 1 has a surface portion 4 made of a stainless steel material, is smooth and has a conical shape at the upper part of the central cylindrical part, and a lower part of the metal powder removing unit 2 and an anti-conical shape. Three support members 3 made of a round bar made of a material are attached so that the upper part is attached to the cylindrical part, and the lower part is bent so as to be fitted along the inner peripheral wall of the discharge pipe 11 described later. As shown in (b), the lower end portions of these three support members 3 are bent so that the center comes to the center position of the metal powder removing portion 2. Further, the shorter the length of the central cylindrical portion, the more effective the material outflow control is, and it does not have to be as shown in FIG.

FIG. 2 shows a front external view when the metal powder removing unit 1 is installed in the container 8 storing the granular material. The straight body portion 9 in which the upper side portion storing the granular material is made into a substantially cylindrical shape, the tapered portion 10 in which the lower side portion is made into a substantially inverted conical shape, and the granular material are discharged to the lower end portion of the tapered portion 10. In the container 8 having the discharge pipe 11 to be performed, the metal powder removing unit 1 for the granular material is installed under the tapered portion 10. The support member 3 hangs down to a position where the round bar attached to the cylindrical portion at the center of the metal powder removing portion 2 is the designed gap distance between the taper portion 10 and the metal powder removing portion 2, and then the taper portion It bends inward according to the inclination, and then curved according to the inner diameter of the discharge pipe 11. Therefore, by inserting the support member 3 into the discharge pipe 11, the gap between the metal powder removing unit 2 and the taper unit 10 can be obtained by the design value, and the metal powder removing unit 1 can be installed at the center of the container.

Next, the operation will be described with reference to FIG. The canopy 12 at the top of the container 8 is opened, and the mixed material is charged. The material is discharged from the discharge pipe 11, and the granular material stored in the container 8 receives the resistance of the upper taper portion of the metal powder removing unit 2, becomes a mass flow, and the mixed material is discharged from the discharge pipe 11 uniformly. If the metal powder removal unit is not provided, when the mixed material is discharged from the lower part of the container 8, the material near the center of the discharge port is discharged preferentially, It is known to exhibit an outflow mode in which the material moves horizontally toward the center. When this granular material moves horizontally, frictional force acts between the granular materials, the material that tends to flow moves first, and the material that does not easily move stagnates, so that the mixed material is separated. Further, the metal powder can be removed by allowing the powder material to pass through the narrow gap between the metal powder removing portion 2 and the taper portion 10 to remove the metal powder adhering to most of the material.

The modification regarding the support member 3 of the metal powder removal unit 1 is demonstrated based on FIG. 3 and FIG. As shown in FIG. 3 (b), the metal powder removing portion 2 is joined at the central portion without the intermediate member 7 at the central portion, the upper portion having a conical shape and the lower portion having an inverted conical shape. Further, the support member 3 is made of a stainless steel rod and is fixed along an inverted conical bus bar. The support member 3 is extended to be a fluid hopper upper portion 17 and a taper portion which are a straight body portion of the fluid hopper 14 shown in FIG. The support member corner portion 13 is bent at the joint portion with the fluid hopper lower portion 16, and the metal powder removing portion is caused by frictional force with the fluid hopper upper portion 17 along the vertical upper portion of the fluid hopper upper portion 17 from the corner portion. 2 is fixed with a fluid hopper lower part 16 and a gap.

FIG. 4 shows an external view when the metal powder removing unit 1 is installed in the fluid hopper 14. The fluid hopper 14 has a tapered fluid hopper lower portion 16 connected to the material supply / discharge pipe 15 at the lower portion and a fluid hopper upper portion 17 whose upper portion has a cylindrical shape, so that the material does not pass therethrough but the dust and air pass therethrough. A separation unit 18 composed of a plate or a net is installed, and a canopy 20 is installed together with a gasket 19 at the upper end of the fluid hopper 14 to seal gas and materials. This is the canopy 20 is mounted an air suction port 21 is connected to a suction air source 33 through the suction air pipe 34 shown in FIG. On the other hand, an introduction pipe 22 is connected to the side of the material supply / discharge pipe 15 from a substantially horizontal or oblique direction, and a discharge port 23 is provided below the material supply / discharge pipe 15. The discharge port 23 is connected to a discharge damper 24, connected to a glass tube 26 to which a level switch 25 is attached, and a flow hopper 14 connected to an attachment seat 27 is configured.

When the mounting seat 27 is connected to a device having a sealed structure, the discharge damper 24 is not essential and may be omitted. A glass tube 26 to which a level switch 25 as shown in FIG. 8 as a prior art is attached may be located between the material supply / discharge tube 15 and the flow hopper lower portion 16.

A system example when the metal powder removing unit 1 is installed in the fluid hopper 14 will be described with reference to FIG. The powder hopper 14 has a transport pipe 31 connected to an introduction pipe 22, one or more raw material supply sources 32 connected via the transport pipe 31, and suction of the air suction port 21 and the suction air source 33. By being connected via the intake pipe 34, the air is sucked and transported into the flow hopper 14 of the granular material through the transport pipe 31 by the air suction force, and only the fine powder and dust contained in the granular material together with the air flow are sucked into the suction air pipe 34. And is collected by passing through the dust collection filter 35, and only air is discharged from the suction air source 33.

As a raw material supply source 32 for supplying raw materials, a dryer 36 is used for suction transportation through which a material is introduced into a transport pipe 31 via a feeder A 37 and a raw material tank 38 is provided via a feeder B 39 and taken in from a secondary air inlet 40. The air is connected to the introduction pipe 22 of the fluid hopper 14 through the transport pipe 31 together with air. The feeder A37 employs a damper or the like, and the feeder B39 employs a rotary valve or a screw in addition to the damper. The dryer 36 and the raw material tank 38 used for the raw material supply source 32 are not limited to two, and may be one or three or more. When the raw material is a single material, it is used when a material obtained by removing powder or metal powder from the raw material is required, for example, when pneumatically transported to the synthetic resin molding machine 41. Alternatively, when the raw material supply source 32 pneumatically transports a plurality of unmixed raw materials or mixed raw materials and stir-mixes or re-stir-mixes them, for example, to a synthetic resin molding machine 41 that requires mixed raw materials of plastic recycled materials To do.

The operation of the flow hopper 14 according to this embodiment configured as described above will be described. When the synthetic resin molding machine 41 using the molding material is operated, the molding material in the glass tube 26 is decreased, and the level switch 25 issues a molding material request signal, the discharge damper 24 is closed. Next, the feeder A37 of the dryer 36, which is the raw material supply source 32, discharges the set amount molding material to the transport pipe 31, and simultaneously discharges the set amount material from the feeder B39 of the raw material tank 38 to the transport pipe 31. To do. When the material discharge timers from the feeder A37 and the feeder B39 issue a completion signal, the flow mixing process is started. When the suction air source 33 is activated, the molding material from the raw material supply source 32 is supplied from the secondary air intake port 40. The air is sucked and transported from the introduction pipe 22 to the fluid hopper 14 through the transport pipe 31 together with the sucked air.

The molding material and air that have entered from the introduction pipe 22 are introduced into the fluid hopper 14 through the material supply / discharge pipe 15. The injected molding material and air flow to the upper part by reducing the air flow resistance by the gap formed by the inverted conical shape of the lower part of the flow hopper lower part 16 and the metal powder removing part 2. The material contacts the inverted conical portion at the bottom of the metal powder removing unit 2, and the material transmits static electricity to the metal powder removing unit 2. At the same time, the metal powder is adsorbed on the surface of the metal powder removing unit 2, and the metal powder is removed from the material. Remove. Since the wind speed is stalled by entering the fluidized hopper upper part 17 having a large space, the material falls again to the fluidized hopper lower part 16, and the conical shape part at the upper part and the inverted conical shape at the lower part of the metal powder removing part 2. Touching the part, the material is removed static electricity and metal powder is removed. While the suction air source is in operation, the molding material sucked from the introduction pipe 22 is sucked up by the fluid hopper upper part 17, dropped into the fluid hopper lower part 16, and again sucked up and mixed again.

Since the sucked air moves to the suction air source 33 together with the fine powder and dust that have passed through the separation unit 18, the fine powder and dust are removed from the molding material, and at the same time, in the case of dissimilar materials, the fluid is stirred and mixed, and the material becomes uniform. And static electricity is removed. Further, as described above, the metal powder is removed by the molding material coming into contact with the metal powder removal unit 1 many times during the fluid mixing. When the fluid mixing timer issues a completion signal, the process proceeds to the discharge process, the suction air source 33 stops, the mixed molding material falls by its own weight from the fluid hopper lower part 16 to the material supply / discharge pipe 15, and the discharge damper 24 It is held open until the next molding material is transported. When the resin is used by molding by the synthetic resin molding machine 41, the molding material is slowly discharged by its own weight. At this time, the material controls the flow of the material by the metal powder removing unit 1 and becomes a mass flow in which the material flows as a whole. Further, by removing static electricity, the material does not adhere to the inner surface of the flow hopper 14, and the material at the time of discharge can be supplied stably. Further, the metal powder adhering to the metal powder removing unit 1 can be re-installed by simply removing the metal powder removing unit 1 by hand, removing it with a compressor air or cloth, and placing it on the fluid hopper 14 or the container 8.

FIG. 6 shows a modification of the fluid hopper. The lower end portion of the flow hopper lower portion 16 is provided with a flange upper portion 48 and a material supply / discharge tube inner tube 49, and a flange lower portion 51 is formed at the upper end of the material supply / discharge tube outer tube 50 so as to cover the material supply / discharge tube inner tube 49 with a gap. An introduction pipe 52 through which air and material are introduced is connected substantially horizontally to the side surface of the material supply / discharge pipe outer cylinder 50. These are integrated by joining the flange upper part 48 and the flange lower part 51. Other structures is omitted because it is similar to FIG. 4. Although the introduction pipe 22 is substantially horizontal, it may be inclined downward or obliquely upward.

As described above, the metal powder removal unit 1 according to the present invention has a simple structure, and is free of metal powder from unmixed and remixed raw materials, and excellent static electricity removal and discharge control. It can be used when discharging powder from the storage container.

DESCRIPTION OF SYMBOLS 1 Metal powder removal unit 2 Metal powder removal part 3 Support member 4 Surface part 5 Magnet 6 Yoke 7 Intermediate member 8 Container 9 Straight body part 10 Tapered part 11 Discharge pipe 12 Canopy 14 Fluid hopper 15 Material supply / discharge pipe 16 Fluid hopper lower part 17 Flow hopper upper part 18 Separating part 19 Gasket 20 Canopy 21 Air suction port 22 Introducing pipe 23 Discharge port 25 Level switch

Claims (3)

A straight body portion in which the upper side portion storing the granular material is made into a substantially cylindrical shape, a tapered portion in which the lower side portion is made into a substantially inverted conical shape, and discharge that discharges the granular material to the lower end portion of the tapered portion. In a container having a tube, it is composed of a weak magnetic body or a non-magnetic body made of a conductive material that is integrated with a conical shape on the upper surface and an inverted conical shape on the lower surface, which is installed in the tapered portion. A metal powder removing unit for a granular material comprising a metal powder removing portion containing a magnet therein and a conductive material support member for obtaining a gap between the tapered portion. The metal powder removal unit is electrically connected to the container made of a conductive material through the support member and the surface portion of the metal powder removal unit made of a conductive material, and the static electricity generated in the granular material, 2. The metal powder removing unit for the granular material according to claim 1, wherein the metal powder removing unit is configured to be moved by contacting the metal powder removing unit and the container to discharge static electricity to the outside. The container is a canopy in which an inlet pipe for receiving a granular material that is pneumatically transported to the side surface of the discharge pipe, and an air suction port to which a suction air source is connected to an upper end portion of a straight body portion at the upper part of the container. And a separation part for separating the particulate material from the transport air ,
The granular material charged from the introduction pipe flows upward through the discharge pipe, through the gap, and repeatedly rises and falls while the suction air source operates, so that the metal powder 3. The metal powder removing unit for a granular material according to claim 1, wherein the metal powder removing unit is installed in the tapered portion so as to repeat contact with the removing portion .

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