JP4949309B2 - Powder and particle mixing equipment - Google Patents

Description

  The present invention relates to a mixing device for a granular material that uniformly mixes the granular material prior to packaging two or more types of granular material.

  Conventionally, in a mixture composed of two or more kinds of substances such as fertilizers and agricultural chemicals, the substance is sown in the field in the form of powder or granules (hereinafter referred to as "powder") instead of as a solution. There are cases like this. In such a mixture of powder and granule, it is used such that a certain amount of the mixture packed in a container such as a bag is taken out and is left as it is in a field or the like. In consideration of the convenience of the user, it is necessary that the powders of various types are uniformly mixed in advance when they are packaged in a container. Therefore, in such a mixture, in order to package in a container such as a bag, it is required to mix evenly prior to filling the container with powder particles.

  Conventionally, as one of the devices for mixing a plurality of types of charged granular materials, there is a device that has been devised in the filling hopper 30 connected to the upstream side of the filling machine, as shown in FIG. The filling hopper 30 has a structure in which a charging inner surface is an inclined wall surface 31, and a plurality of baffle plates 32 erected on the inclined wall surface 31 to obstruct the lowering of the powder particles. A plurality of different types of powder granules A, B, C, and D introduced from above the filling hopper 30 repeatedly collide with the baffle plates one after another when falling inside the filling hopper 30. Gradually mixed. The powder particles exiting the filling hopper 30 are directly put into a filling cylinder of a filling machine and packaged in a container such as a bag.

  In this type of mixing method, in order to ensure sufficient mixing when leaving the filling hopper 30, it is necessary to ensure a considerable drop distance, and the filling hopper is enlarged. In addition, it takes a long time for the granular materials A to D to exit from the charging to the exit. If the fall distance is short, the powder particles will not mix on average, and even if the number of baffle plates is increased, the powder particles will not always be mixed evenly at any time and at any part. There is also.

  Moreover, there exists what is shown in FIG. 10 as another apparatus which mixes the supplied multiple types of granular material. This device has a structure in which a cone-shaped screw 41 is inverted in a filling hopper 40 with the tip side facing upward, and the rotational direction of the screw 41 is set as a direction in which the fallen granular material is sent upward. Yes. A plurality of types of separate granules A, B, C, and D introduced from above the filling hopper 40 are carried so as to be scraped upward by the screw 41 when falling inside the filling hopper 40 by its own weight, It is mixed with the falling powder and granule.

  In the conventional apparatus shown in FIG. 10, the powder 41 is scraped up against the drop by the screw 41, so that there is a problem that it takes too much time until the powder is finally mixed and discharged. is there. In addition, since the stirring action by the screw 41 is strong and continues for a long time, in the case of a granular material having a relatively large particle size (the optimum particle size may be specified depending on the use situation), There exists a problem that a body will be crushed into the granular material with a smaller particle size.

As a mixing hopper device for mixing two or more kinds of materials, a second hopper is provided on the upper part of the lower first hopper, a continuous screw is provided at the center of these hoppers, and the length of the screw is included in the first hopper. In addition to wrapping the screw with a cylindrical body shorter than the tip of the rod, there is proposed a device having a see-through window and mixing the material of the second hopper with the material of the first hopper by extruding the material to the first hopper with a screw ( Patent Document 1). In addition, a hopper body having a workpiece inlet at the top and a mixed workpiece outlet at the lower side is provided at the bottom of the inner space of the hopper body, and the outlet from the other side of the hopper body. A transfer means with a feed blade for transferring the workpiece toward one side, and a rotary shaft disposed in a space above the transfer means and extending in the same direction as the transfer means, and on the circumference of the rotary shaft A mixing hopper having a mixing blade having a mixing blade, the rotation mixing device having a reverse feed blade for feeding the workpiece back to the other side of the hopper body, There has been proposed one that controls the amount of movement of the object to be processed toward the discharge port of the hopper body by the difference in the transfer amount between the blade and the reverse feed blade of the rotary mixing means (see Patent Document 2).
Japanese Patent Laid-Open No. 11-192618 JP 2002-102665 A

  Therefore, when packaging two or more types of granular materials in a container such as a bag, there is a problem to be solved in that the stirring effect of the rotating blades is used to ensure uniform efficiency.

  The object of the present invention is for a granular material that enables efficient and sure mixing of two or more types of granular materials into a uniform state when packaging them in a container such as a bag. It is to provide a mixing device.

  In order to solve the above problems, a mixing apparatus for a granular material according to the present invention includes a rotating drum for stirring that rotates around a horizontal axis, and a powder that contains the rotating drum for stirring and that is to be mixed from above. And a hopper having an opening / closing portion capable of discharging the mixed granular material downward, and the rotating drum for stirring rotates inside a rotatable outer ring and the outer ring. Each of the outer ring and the inner ring includes a plurality of side disks on both sides in the longitudinal direction and a plurality of bowls that connect the both side disks. It has a connecting bar and a plurality of stirring blades attached to each connecting bar.

  According to this mixing apparatus for granular materials, when the rotating drum for agitation rotates around the horizontal axis, a plurality of arranged in a bowl shape that connects the side disks on both sides in the longitudinal direction constituting the outer ring and the inner ring, respectively. The connecting bars and a plurality of stirring blades attached to the connecting bars rotate. A plurality of types of powder particles charged into the hopper from above are collided and agitated by these connecting bars and agitation blades when they pass through the rotating drum for agitation, and are mixed and homogenized. It becomes powder and is discharged from the hopper outlet.

  In this mixing apparatus for granular materials, the outer ring and the inner ring can be rotated by a rotating shaft having a common horizontal axis. With such an arrangement, the wheel rotation shaft structure of the outer ring and the inner ring can be simplified. Further, the outer ring and the inner ring can be rotated in the same direction or in the opposite directions to each other, and when the stirring rotary drum rotates in the opposite directions, the stirring action on the granular material becomes more efficient.

  In this mixing apparatus for granular materials, the rotating drum for stirring can be arranged in one or more stages vertically in the hopper. The granular material put into the hopper is stirred every time it passes through the rotating drum for stirring in each stage, and further mixed uniformly. When the stirring rotary drums are arranged in a plurality of stages, the stirring rotary drums of the respective stages can be arranged so that their rotation axes are parallel to each other or their rotation axes are alternately orthogonal. In particular, when the rotating drums for stirring are arranged so that the rotation axes are alternately orthogonal, the mixing direction of the powder particles is changed alternately, so that the mixing of the powder particles can be made even more uniform. it can.

  Furthermore, this mixing apparatus for granular materials can be applied to a filling hopper used in a filling machine for filling the mixed filling into a container. In the filling hopper, the powder and powder are uniformly mixed by the powder and particle mixing device, and the powder and powder are uniformly fed into the filling machine and packed in a container such as a bag. The Since the filling machine can be a vertical bag making filling and packaging machine, at this time, filling into the bag and packaging by sealing the opening are performed. Furthermore, in this case, the open / close portion of the hopper is a pool hopper portion having an open / close door that can be pooled for one time of container packing and can be opened at the time of container packing in the closed state. It can be.

  Since the present invention is configured as described above, even when two or more types of granular materials are packaged in a container such as a bag, these granular materials are efficiently and reliably made uniform. It is possible to provide a mixing apparatus for powder particles that can be mixed.

  Hereinafter, an embodiment of a mixing apparatus for granular materials according to the present invention will be described based on the attached drawings. FIG. 1 is a front view of a mixing apparatus for granular materials according to the present invention as viewed from the axial direction of a rotating shaft of a rotating drum for stirring, FIG. 2 is a side view of the mixing apparatus for granular materials shown in FIG. It is a figure which shows the rotating drum for stirring of the mixing apparatus for granular materials shown in 1. FIG.

  As shown in FIG.1 and FIG.2, the mixing apparatus 1 for granular materials which concerns on embodiment of this invention accommodated the rotating drum 2 for stirring rotated around a horizontal axis, and the rotating drum 2 for stirring inside. And a hopper 3 in a state. The hopper 3 includes an opening 5 in which an opening 4 into which powder particles to be mixed can be charged from above is formed, and an opening / closing unit 6 that can discharge the powder particles mixed by the stirring rotary drum 2 downward. have.

  In the closed state, the opening / closing part 6 of the hopper 3 is a pool hopper part that can pool the mixed granular material by an amount for container filling for one time. Powder particles can be released. The open / close doors 7 and 7 are double-open types, but one door can be fixed and only one door can be opened / closed. Opening and closing of the open / close doors 7 and 7 is controlled in synchronization with the operation of a filling machine connected to the downstream side of the powder mixing device 1 and provided for packing the powder particles.

  The stirring rotary drum 2 is formed in a cage shape having a rotatable outer ring 10 and an inner ring 11 rotatably arranged inside the outer ring 10. In this example, the rotation axis 12 of the outer ring 10 and the inner ring 11 is common. The outer ring 10 has side discs 13 and 14 on both sides in the longitudinal direction and a plurality of connecting bars 15 arranged in a bowl shape connecting the both side discs 13 and 14 (reference numerals are given only to some connecting bars). And a plurality of stirring blades 16 (reference numerals are attached only to some stirring blades) attached to each connecting bar 15. Similarly, the inner ring 11 includes side discs 17 and 18 on both sides in the longitudinal direction and a plurality of connecting bars 19 arranged in a bowl shape connecting the both side discs 17 and 18 (only a part of the connecting bars are indicated). And a plurality of stirring blades 20 (the reference numerals are attached only to some stirring blades) attached to each connecting bar 19. The inner ring side discs 17 and 18 are smaller than the outer ring side discs 13 and 14, and the inner ring connecting bar 19 is shorter than the outer ring connecting bar 15. In the outer ring 10, the radial lengths of the attachment positions of the connection bars 15 do not have to be the same. The same applies to the connection bar 19 of the inner ring 11.

  As shown in FIG. 3, the drive shaft 21 for driving the stirring rotary drum 2 is concentric with an outer drive shaft 22 for driving the outer ring 10 and an inner drive shaft 23 for driving the inner ring 11. In preparation. The outer drive shaft 22 is connected close to the outer side of the end plate 13 and is a drive shaft having a short shaft length. On the other hand, the inner drive shaft 23 is a drive shaft that passes through the outer drive shaft 22 and the side discs 17 and 18 and extends through the stirring rotary drum 2 as a single shaft and has a long shaft length. The outer drive shaft 22 and the inner drive shaft 22 are supported by a bearing 24 so as to be relatively rotatable. Further, the inner drive shaft 23 is connected to the inner side of the side discs 17 and 18 via metal fittings 25 and 25, respectively. A rotation axis 12 common to the outer drive shaft 22 and the inner drive shaft 23 is a horizontal axis, and the outer ring 10 and the inner ring 11 rotate around the horizontal axis.

  A first sprocket 26 is provided on the outer drive shaft 22 for driving the outer ring 10, and a chain (not shown) is wound around the outer drive shaft 22. Similarly, a second sprocket 27 is provided on the inner drive shaft 23 for driving the inner ring 11, and a chain (not shown) is wound around the inner drive shaft 23. These sprockets 26 and 27 are each driven by a motor (not shown) (for example, a servo motor). The outer ring 10 and the inner ring 11 are rotated in the same direction or in opposite directions. The rotational speed of the outer ring 10 and the inner ring 11 is about several tens of revolutions per minute. From the viewpoint of not making a difference in the peripheral speed, the rotational speed of the inner ring 11 is slightly higher than the rotational speed of the outer ring 10. Is preferred. When the outer ring 10 and the inner ring 11 are rotated in the opposite directions, the relative rotation becomes larger and the stirring action is stronger, and a plurality of types of falling powder particles can be mixed more uniformly.

  The inner drive shaft 22 can be structured to be coupled by a coupling 28 in the middle of the inner and outer regions of the hopper 3. Since the inner drive shaft 22 can be separated at the position of the coupling 28, the stirring rotary drum 2 can be separated from the drive system, and the stirring rotary drum 2 and the hopper 3 can be individually subjected to cleaning and maintenance.

  Each connecting bar 15 of the outer ring 10 and each connecting bar 19 of the inner ring 11 are fixed to the side discs 13, 14, 17, 18, respectively. Since the connecting bars 15 and 19 and the stirring blades 16 and 20 do not have a movable part, the falling granular material does not enter the gap between the movable parts.

  4-8 is a figure which shows another embodiment of the mixing apparatus for granular materials by this invention, respectively. In the granular material mixing apparatus 1a according to the embodiment shown in FIGS. 4 to 5, the stirring rotary drums 2a and 2b are arranged in a plurality of stages in the vertical direction in the hoppers 3a and 3b. In the embodiment shown in FIG. 4, the rotating drums 2a and 2b for stirring in each stage have the same structure as the rotating drum 2 for stirring shown in FIGS. The rotating shafts 12a and 12b are arranged in parallel to each other. The granular material dropped into the hoppers 3a, 3b collides with the connecting bars and the stirring blades one after another by the stirring rotary drums 2a, 2b at each stage, and is further uniformly mixed. . The arrangement of the stirring rotary drum 2b is not essential, but it is preferably provided immediately below the stirring rotary drum 2a.

  In the powder mixing apparatus 1b which is the embodiment shown in FIGS. 6 to 8, the stirring rotary drums 2c and 2d in each stage are the same as the stirring rotary drum 2 of the embodiment shown in FIGS. The rotating shafts 12c and 12d are alternately arranged orthogonal to each other. In this case, every time the powder is dropped and stirred by the rotating drums 2c and 2d for each stage, the mixing direction of the powder is changed alternately. Therefore, the powder particles can be further uniformly mixed.

  A filling machine for filling the mixed filling material into a container can be connected and arranged downstream of the hopper 3. A shutter may be provided downstream of the hopper 3 in multiple stages. Moreover, you may drop a granular material from the hopper 3 to a bucket conveyor. The filling machine can be a bag-feeding packaging machine, that is, a device that feeds bags manufactured in advance one by one to the discharge outlet of the hopper 3 or the carry-out end of the bucket conveyor and individually wraps them. The filling machine may also be a bag-making filling and packaging machine that fills powder particles inside the bag while forming a bag. In the bag supply packaging machine and the bag making and filling packaging machine, the bag can be gusseted, sealed and folded, and further, boxing (cartoning system) can be applied.

It is a front view which shows one Embodiment of the mixing apparatus for granular materials by this invention. It is a side view of the mixing apparatus for granular materials shown in FIG. It is a figure which shows the rotating drum for stirring of the mixing apparatus for granular materials shown in FIG. It is a front view which shows another embodiment of the mixing apparatus for granular materials by this invention. It is a side view of the mixing apparatus for granular materials shown in FIG. It is a front view which shows another embodiment of the mixing apparatus for granular materials by this invention. It is a side view of the mixing apparatus for granular materials shown in FIG. It is a top view of the mixing apparatus for granular materials shown in FIG. It is the schematic which shows an example of the mixing apparatus for the conventional granular materials. It is the schematic which shows another example of the mixing apparatus for the conventional granular materials.

Explanation of symbols

1,1a, 1b Mixing device for powder particles 2,2a, 2b, 2c, 2d Rotating drum for stirring 3,3a, 3b, 3c, 3d Hopper 4 Opening 5 Opening 6, 6c, 6d Opening / closing 7, 7 Opening / closing Door 10 Outer ring 11 Inner ring 12, 12a, 12b, 12c, 12d Rotating axis 13, 14 Side disc 15 Connection bar 16 Stirring blade 17, 18 Side disc 19 Connection bar 20 Stirring blade 21 Drive shaft 22 Outer drive shaft 23 Inner drive shaft 24 Bearing 25, 25 Metal fitting 26 First sprocket 27 Second sprocket 28, 28 Coupling

Claims (8)

A rotating drum for stirring that rotates around a horizontal axis, an opening in which the rotating drum for stirring is housed and into which powder particles to be mixed can be charged from above, and the mixed powder particles are moved downward A hopper having a dischargeable opening and closing part,
The stirring rotary drum has a rotatable outer ring and an inner ring that is rotatably arranged inside the outer ring, and the outer ring and the inner ring are respectively side discs on both sides in the longitudinal direction, A mixing apparatus for a granular material, comprising: a plurality of connecting bars arranged in a bowl shape for connecting the both side surface disks, and a plurality of stirring blades attached to each connecting bar.   The mixing apparatus for granular materials according to claim 1, wherein the outer ring and the inner ring are rotated by a rotating shaft having a common horizontal axis.   The mixing apparatus for granular materials according to claim 1 or 2, wherein the outer ring and the inner ring are rotatable in the same direction or in opposite directions.   The mixing apparatus for granular materials according to any one of claims 1 to 3, wherein the rotating drum for stirring is arranged in a single stage or a plurality of stages vertically in the hopper.   The mixing apparatus for granular materials according to claim 4, wherein the plurality of stages of the rotating drums for agitation are arranged in parallel with each other.   The mixing apparatus for granular materials according to claim 4, wherein the plurality of stages of the rotating drums for stirring are arranged such that their rotation axes are alternately arranged orthogonally.   The mixing apparatus for granular materials according to any one of claims 1 to 6, wherein the mixing apparatus is applied to a filling hopper used in a filling machine for filling the mixed filling into a container.   The opening / closing portion of the hopper is a pool hopper portion having an opening / closing door that can be pooled for one time of container filling and can be opened at the time of container filling in the closed state. The mixing apparatus for granular materials according to claim 7.

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