JP2011245415A - Stirring blade and stirring granulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stirring blade which is lighter in weight than heretofore and enables easy handling while improving stirring efficiency and controlling attachment of raw materials to improve operation efficiency in a stirring granulator.SOLUTION: The stirring blade 3 set in the stirring granulator for stirring and granulating the granular powders has a center cone 31 and the blades 32 arranged radially on the periphery of the center cone 31. The operating portions 40 are recessedly set at a front face side in the rotating direction of the blade 32. The operating portion 40 is composed by three inclined planes 41, 42 and 43 downwardly inclined to a rotation direction side, wherein the inclined planes contact each other at a rallying point P forming the top of dent of the operating portion 40. The round angle θ1 of the inclined planes 41, 42 and 43 at the rallying point P is less than 360°, and the angle of the front side of a rotating direction formed mutually by the planes 41, 42 and 43 is less than 180°.

Description

  The present invention relates to an agitation granulator that performs processing such as agitation and granulation of a granular material, and particularly relates to an improvement in performance and weight reduction of an agitation blade used in the agitation processing.

  2. Description of the Related Art Conventionally, as a manufacturing apparatus for pharmaceuticals and foods, there is known an agitation granulator that arranges a rotary blade member in a cylindrical processing vessel (vessel) and performs processing such as agitation and granulation of powder particles. Yes. For example, Patent Documents 1 to 3 describe an agitation granulator in which 2 to 4 blades (stirring blades) are arranged in a cylindrical container whose side surfaces are upright or inclined. The agitation granulator is provided with a nozzle for supplying a binder liquid and the like, and a chopper for crushing the aggregated processed material, and agitating while appropriately dropping or spraying the binder liquid or the like on the granular material in the container. By rotating the blades, processes such as agitation, mixing, granulation and the like of the granular material are executed.

  In such an agitation granulator, various devices are applied to the shape of the agitation blade in order to improve the agitation efficiency and suppress the adhesion of the raw material to the side surface of the processing container during the treatment. For example, Patent Document 1 discloses a rotary blade whose tip is bent in a twisted shape. Patent Document 2 describes a stirring blade in which a distal end portion is bent in a rotation direction and an air supply nozzle is provided at the bent distal end portion (inclined portion). Furthermore, Patent Document 3 describes a stirring blade having a tip portion preceded in a rotational direction with respect to a base end portion.

Japanese Utility Model Publication No.41-3596 Japanese Utility Model Publication No. 56-137729 Japanese Patent No. 3164600

  On the other hand, in such an agitation granulator, the improvement of the agitation efficiency and the suppression of raw material adhesion as well as the ease of setting the agitation blades are also a big problem for the user. However, conventional agitating blades have a large weight, and a large production machine requires equipment such as a winch for dividing and setting the agitating blades. The lighter the agitating blade, the easier the operation. Particularly, since the blade portion of the stirring blade is attached in a cantilevered state, the tip of the blade tends to be lowered by its own weight, and it is necessary to increase the member width and thickness of the blade at the base of the blade in order to suppress it. For this reason, the weight of the whole stirring blade tends to become large, and it cannot be said that the conventional stirring blade is always easy to handle.

  An object of the present invention is to provide a stirring blade that is lighter and easier to handle while improving the stirring efficiency and suppressing the adhesion of raw materials, and to improve the working efficiency of the stirring granulator.

  The stirring blade of the present invention is installed in a processing container of an agitation granulator for agitation and granulation of a granular material, a center cone connected to a rotation drive member, and a plurality of radial cones attached to the center cone The blade has a working portion recessed on the front side in the rotational direction of the blade, and the working portion has a downward slope on the rotational direction side. Further, it is characterized by being formed by a plurality of three or more inclined surfaces.

  In this invention, it can be moved upwards so that the granular material in stirring granulation processing may be held by the action part provided in the blade of the stirring blade. For this reason, the granular material pressed against the processing container side wall of the agitation granulator is reduced, and the adhesion of the raw material to the processing container side wall is suppressed.

  In the above, a first slope disposed on the processing vessel bottom surface side of the blade and a second slope disposed on the tip end side of the blade extending upward from an upper edge of the first slope on the action portion. And a third inclined surface extending upward from an upper edge of the first inclined surface and disposed on the center cone side of the second inclined surface, wherein the first to third inclined surfaces are depressions of the action portion. They may be in contact with each other at the set point P forming the vertices.

  Further, the turning angle θ1 of the first to third slopes at the gathering point P may be less than 360 °, and the angle on the front side in the rotational direction formed by the slopes of the first to third slopes surrounding the gathering point P Each may be less than 180 °.

  The first slope may be inclined by 1 ° to 15 ° with respect to the bottom surface of the processing container. Further, an angle on the front side in the rotation direction formed by the second slope and the first slope may be 105 ° to 175 °, and the first slope on the first slope where the second slope is in contact with the front edge in the rotation direction of the first slope. The angle formed by the edge may be 10 ° to 75 °. Furthermore, the angle on the front side in the rotational direction formed by the third slope and the first slope may be 95 ° to 175 °. In addition, the upper edge of the stirring blade and the front edge in the rotational direction of the first slope may be formed substantially in parallel.

  On the other hand, the agitation granulator of the present invention includes a processing container for storing the powder and a stirring blade disposed in the processing container, and the stirring of the powder by rotating the stirring blade. The agitation granulator performs granulation, wherein the agitation blade has a center cone connected to a rotation drive member, and a plurality of blades radially attached to the center cone, The blade has a working portion recessed on the front side in the rotational direction of the blade, and the working portion is formed by a plurality of three or more inclined surfaces having a downward slope on the rotational direction side. .

  In this invention, it can be moved upwards so that the granular material in stirring granulation processing may be held by the action part provided in the blade of the stirring blade. For this reason, the granular material pressed against the processing container side wall of the agitation granulator is reduced, and the adhesion of the raw material to the processing container side wall is suppressed.

  In the agitation granulator, the action portion is provided with a first slope disposed on the bottom surface side of the processing container of the blade and an upper edge of the blade extending upward from an upper edge of the first slope. A second slope and a third slope extending upward from an upper edge of the first slope and disposed on the center cone side of the second slope, wherein the first to third slopes are You may make it contact | connect each other in the gathering point P which forms the vertex of the hollow of an action part.

  According to the agitating blade of the present invention, since the action portion is recessed on the front side in the rotation direction of the blade of the agitating blade, the agitating / granulating process or the like causes the acting powder to move the granular material being processed upward. It is possible to move to. Thereby, the granular material pressed against the processing container side wall of a stirring granulator reduces, and the raw material adhesion to a processing container side wall is suppressed. Accordingly, waste of raw materials is reduced and the yield of the product is improved. Further, the processing container is not easily soiled, the maintenance of the apparatus is facilitated, and the working efficiency is improved. Furthermore, by providing the action part as described above, it is possible to reduce the weight of the stirring blade while improving the stirring efficiency and suppressing the adhesion of the raw material.

  According to the agitation granulator of the present invention, in the agitation granulator for agitation, granulation, etc., with the agitation blade for the granular material accommodated in the processing vessel, the front side in the rotational direction of the blade of the agitation blade Since the action part is provided in the recess, the action part can move the granular material being processed upward by the action part during the agitation / granulation process or the like. Thereby, the granular material pressed against the processing container side wall of a stirring granulator reduces, and the raw material adhesion to a processing container side wall is suppressed. Accordingly, waste of raw materials is reduced and the yield of the product is improved. Further, the processing container is not easily soiled, the maintenance of the apparatus is facilitated, and the working efficiency is improved. Furthermore, by providing the action part as described above, it is possible to reduce the weight of the stirring blade while improving the stirring efficiency and suppressing the adhesion of the raw material.

It is explanatory drawing which shows the structure of the stirring granulation apparatus which is Example 1 of this invention. It is a perspective view which shows the structure of the stirring blade which is Example 1 of this invention. It is sectional drawing which shows the structure of a center cone. It is explanatory drawing which shows the structure of the action part formed in the braid | blade. It is a perspective view which shows the structure of the stirring blade which is Example 2 of this invention.

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

FIG. 1 is an explanatory diagram showing the configuration of an agitation granulator that is Embodiment 1 of the present invention. The agitation granulator 1 in FIG. 1 includes a vessel (processing vessel) 2 having a substantially cylindrical shape with a bottom, and an agitation blade 3 is disposed at the center of the bottom of the vessel 2. The vessel 2 is placed on the table unit 5 of the apparatus housing 4. A stirring blade motor 6 is accommodated below the vessel 2 of the apparatus housing 4. The stirring blade motor 6 is connected to a rotary shaft (rotary drive member) 8 via a speed reducer 7. The rotating shaft 8 extends in the vertical direction from the speed reducer 7 and protrudes into the vessel 2. The stirring blade 3 is attached to the upper end portion of the rotary shaft 8 and is rotationally driven by the stirring blade motor 6.

  The vessel 2 has a side wall 11 whose diameter is reduced upward, and a side wall 11 is provided with a discharge portion 12 and a chopper 13. The discharge unit 12 is opened and closed by a handle 14 so that the processed granular material can be discharged therefrom. The chopper 13 is rotationally driven by a chopper motor 15. The chopper motor 15 is placed on the table unit 5.

  An upper lid 17 is attached to the upper end opening 16 of the vessel 2 so as to be freely opened and closed. A binder liquid supply pipe 18, a spray nozzle 19 and a filter 20 are attached to the upper lid 17. A hopper 21 is provided as a binder liquid container above the binder liquid supply pipe 18. The spray nozzle 19 is connected to a compressor and a liquid container (not shown) provided outside the apparatus. In the agitation granulator 1, purge air is supplied between the agitation blade 3 and the vessel 2, and the filter 20 discharges air to the outside of the apparatus while removing the particulates contained in the exhaust air. Is attached.

  FIG. 2 is a perspective view showing the configuration of the stirring blade 3. As shown in FIG. 2, the stirring blade 3 is composed of a center cone 31 and a blade 32. The center cone 31 and the blade 32 are both formed of stainless steel. The outer diameter of the stirring blade 3 is appropriately set depending on the size of the apparatus, but the stirring blade 3 in FIG. 2 has an outer diameter of about 500 mm. The center cone 31 is formed in a truncated cone shape, and the blade 32 is fixed to the outer periphery of the lower portion of the center cone 31 by welding. In the present embodiment, three blades 32 are equally provided on the center cone 31.

  FIG. 3 is a cross-sectional view showing the configuration of the center cone 31. As shown in FIG. 3, the center cone 31 is formed with a mounting hole 33 penetrating in the vertical direction. An upper end portion of the attachment hole 33 is a square hole 34. The square hole 34 is fitted into a rectangular column portion 35 formed in the upper part of the rotating shaft 8. By fitting the square hole 34 to the prism portion 35, the stirring blade 3 rotates integrally with the rotary shaft 8.

  A male screw portion 36 is formed at the upper end portion of the rotating shaft 8. A lock nut 37 is screwed and fixed to the male screw portion 36. The lock nut 37 has a substantially conical shape with a nut portion 38 formed at the tip. The lock nut 37 is fixed to the rotary shaft 8 by attaching a cross wrench to the nut portion 38 and rotating it. That is, the stirring blade 3 is connected and fixed to the rotating shaft 8 by fitting the center cone 31 to the rotating shaft 8 and screwing and fixing the lock nut 37.

  FIG. 4 is an explanatory diagram showing the configuration of the blade 32. As shown in FIGS. 2 and 4, the blade 32 is a concave wing in which the central portion on the front side in the rotational direction is recessed, and the action portion 40 is recessed. The action part 40 is provided on the blade 32 so as to be recessed toward the opposite side (rear side) in the rotation direction, and is constituted by three or more surfaces. In the stirring blade 3, three inclined surfaces 41 to 43 (first to third inclined surfaces) having different inclination angles are provided. The blade 32 is formed by bending one member to form inclined surfaces 42 and 43 and welding the inclined surface 41 to the lower portion thereof.

  Both of the inclined surfaces 41 to 43 are inclined downward in the rotational direction, that is, the distance between the inclined surfaces 41 to 43 and the vessel bottom surface 2a is decreased as the inclined surfaces 41 to 43 are advanced toward the front side in the rotational direction. . The inclined surfaces 41 to 43 are provided with an inclined surface 41 on the bottom surface 2 a side of the vessel 2 and inclined surfaces 42 and 43 above the upper edges 44 a and 44 b of the inclined surface 41. The inclined surface 42 is provided on the tip side of the blade 32, and the inclined surface 43 is provided on the center cone 31 side. The inclined surfaces 42 and 43 are steeper than the inclined surface 41 with respect to the horizontal plane. The blade 32 is formed with a set point P where the three inclined surfaces 41 to 43 are in contact with each other, and the set point P forms the apex of the depression of the action portion 40.

  The turning angle θ1 (θA + θB + θC in FIG. 4) of the meeting point P is less than 360 °. Further, the angles θ2 to θ4 on the front side in the rotational direction between the inclined surfaces 41 to 43 surrounding the set point P are also less than 180 °. When θ1 = 360 °, the set point P cannot be formed, and the blade becomes flat. When θ1> 360 °, the set point of the surface protrudes forward in the rotational direction. Similarly to θ1, θ2 to θ4 are also flat when θ2 to θ4 = 180 °, and are not flat, and when θ2 to θ4> 180 °, the setpoint of the surface protrudes forward in the rotational direction. To do.

  The inclined surface 41 is raised at an angle θ5 with respect to a horizontal plane (the vessel bottom surface 2a). Here, θ5 (rise angle) is 1 ° to 15 °, preferably 5 ° to 10 °. It has become. In addition, the inclination angle θ2 of the inclined surface 42 on the front side in the rotation direction with respect to the inclined surface 41 is 105 ° to 175 °, preferably 120 ° to 160 °, and the inclined surface 42 and the front edge 45 of the inclined surface 41 are The angle θ6 (angle formed by the upper edge 44a and the front edge 45: the bending angle of the inclined surface 42) is 10 ° to 75 °, preferably 20 ° to 50 °. Furthermore, the inclination angle θ3 on the front side in the rotation direction of the inclined surface 43 with respect to the inclined surface 41 is 95 ° to 175 °, preferably 120 ° to 170 °. In the stirring blade 3, by providing such an action unit 40, it is possible to move upward so as to hold the granular material being processed during the operation of the stirring blade 3.

  In general, in the agitation granulator, the granular material being processed tends to flow toward the side wall of the vessel due to the centrifugal force of the agitation blade, thereby causing the raw material to adhere to the inner surface of the vessel side wall. On the other hand, in the agitation granulator 1, the action granule is lifted upward by the action unit 40 and guided to the center side. That is, the granular material being processed is first scooped up from the vessel bottom surface 2a by the inclined surface 41 that directly contacts the granular material in the traveling direction. Next, the granular material scooped up by the inclined surface 41 is lifted upward by the inclined surfaces 42 and 43 (see the arrow in FIG. 4).

  In the blade 32, the inclined surface 42 is provided within a range of about ３ from the blade tip that greatly contributes to the stirring and granulating action, and the inclined surface 42 is located on the center side (center cone 31 side). It is suitable. For this reason, the granular material scooped up by the inclined surface 41 rises along the inclined surface 42 and is lifted in the inner direction by utilizing centrifugal force. Further, in the stirring blade 3, the two-stage scooping operation is performed by the inclined surface 41 and the inclined surfaces 42 and 43, so that the powder particles are smoothly lifted upward.

  Accordingly, during the agitation / granulation process, etc., the granular material is not easily pressed against the inner surface 11a of the side wall of the vessel 2, and adhesion of the raw material to the side wall of the vessel is suppressed. In addition, the inclined surfaces 42 and 43 are inclined more upward than the inclined surface 41, and the granular material being processed is guided upward by the inclined surface 41 and then lifted greatly upward by the inclined surfaces 42 and 43. It is done. For this reason, the stirring blade 3 has a larger action of moving the powder particles upward than the bent blade that is bent with the tip portion advanced in the rotation direction, and has a higher stirring efficiency than the bent blade. And the effect of suppressing the adhesion of raw materials can be obtained.

  Moreover, in the stirring blade 3, since the action part 40 is provided in the shape which makes the braid | blade 32 hollow, the full length (L1 + L2) of the blade 32 is restrained to the same extent as the straight-shaped stirring blade without the action part 40. The tip portion is shorter than the one bent in advance in the rotational direction. For this reason, the material 40 can be prevented from adhering to the side wall of the vessel by the action part 40 without increasing the weight from the straight shape, and the weight can be made lighter than the latter bent blade, which is said to have the same effect. .

  Furthermore, since the action portion 40 has a two-stage configuration of the inclined surface 41 and the inclined surfaces 42 and 43, the effect of lifting the powder can be sufficiently obtained even if the height of the action portion 40 is low. The blade width (height) can be made smaller than that of a conventional straight stirring blade. For this reason, the material of the blade 32 can be reduced while obtaining the effect of suppressing the adhesion of the raw material, and the weight can be reduced and the price can be reduced. Therefore, in the stirring blade 3 according to the present invention, it is possible to reduce the weight of the blade while obtaining higher stirring efficiency and raw material adhesion suppressing effect than the bent blade, and the handling of the stirring blade becomes easy. Product prices can also be reduced.

  In such an agitation granulator 1, processing such as agitation and granulation of the granular material is performed as follows. Here, first, the granular material that is the object to be processed is supplied from the upper end opening 16. Next, the stirring blade motor 6 is driven to rotate the stirring blade 3. At that time, a binder liquid or the like is appropriately supplied into the vessel 2 by a binder liquid supply pipe 18 or a spray nozzle 19. Further, purge air is supplied from the lower end of the center cone 31 between the lower end of the blade 32 and the bottom surface 2 a of the vessel 2.

  The granular material in the vessel 2 is stirred and granulated by the stirring blade 3. At this time, in the agitation granulator 1, the granular material being processed moves upward by the action unit 40 provided on the blade 32. For this reason, the granular material pressed against the side wall inner surface 11a of the vessel 2 is reduced, and the adhesion of the raw material to the vessel side wall is suppressed. Accordingly, waste of raw materials is reduced and the yield of the product is improved. Further, the vessel 2 is difficult to get dirty, the maintenance of the apparatus becomes easy, and the working efficiency is improved.

  In the vessel 2, the granular material that has been subjected to processing such as stirring, mixing, and granulation is appropriately crushed by the chopper 13. Thereby, a granular material is granulated with the stirring granulator 1, and a desired granular product is manufactured. The product for which processing such as mixing and granulation has been completed is discharged from the discharge unit 12.

  FIG. 5 is a perspective view showing the configuration of a stirring blade that is Embodiment 2 of the present invention. In the second embodiment, the same members and portions as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. As shown in FIG. 5, the stirring blade 51 of the second embodiment has a form in which the upper edge of the blade 32 in the stirring blade 3 of the first embodiment is cut, and the upper edge 52 a of the blade 52 is formed of the inclined surface 41. It is substantially parallel to the leading edge 45. The shape of other parts of the stirring blade 51 and the conditions of θ1 to θ6 are the same as those of the stirring blade 3.

  The blade 52 of the second embodiment has a reduced weight as compared with the blade 32 of the first embodiment because the upper portion of the blade is notched as shown by a broken line in FIG. Accordingly, the total length of the blade (L1 + L2) is shorter than the stirring blade 3 of the first embodiment, and is almost the same as the straight-shaped stirring blade without the action portion 40, and the tip portion is bent in advance in the rotation direction. Even shorter. For this reason, it is possible to suppress the adhesion of the raw material to the side wall of the vessel by the action portion 40 without increasing the weight from the straight shape, and the weight can be further reduced as compared with the bent blade.

It goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention.
For example, each numerical value described in the above embodiment is merely an example, and the present invention is not limited to the above numerical value. In the above-described embodiment, a configuration in which one set point P is provided on the blade 32 is shown. However, the number of set points P is not limited to one, and a plurality of set points P are provided on the blade 32. May be. For example, it is also possible to divide the inclined surfaces 42 and 43 to provide more gathering points P.

  On the other hand, in the above-described embodiment, the inclined surfaces 42 and 43 are formed by bending, and the action portion 40 is provided at the lower portion of the inclined surface 41. However, the plate member is joined by welding or the like. The inclined surfaces 41 to 43 may be formed. The blade 32 may be formed by casting, and the action part 40 may be formed integrally.

1 Stirring granulator 2 Vessel (processing vessel)
2a Bottom surface 3 Stirring blade 4 Device housing 5 Table section 6 Stirring blade motor 7 Reducer 8 Rotating shaft (rotation drive member)
11 Side wall 11a Side wall inner surface 12 Discharge portion 13 Chopper 14 Handle 15 Chopper motor 16 Upper end opening portion 17 Upper lid 18 Binder liquid supply pipe 19 Spray nozzle 20 Filter 21 Hopper 31 Center cone 32 Blade 33 Mounting hole 34 Square hole 35 Square column portion 36 Male Screw part 37 Lock nut 38 Nut part 40 Action part 41 Inclined surface (first inclined surface)
42 Inclined surface (2nd inclined surface)
43 Inclined surface (third inclined surface)
44a, 44b Upper edge 45 Front edge 51 Stirring blade 52 Blade 52a Upper edge P Gathering point θ1 of inclined surfaces 41 to 43 Circumference angle θ2 of collecting point P Inclination angle θ3 of inclined surface 41 and inclined surface 42 on the front side in the rotation direction 41 and the inclination angle θ4 on the front side in the rotation direction of the inclined surface 43 The inclination angle θ5 on the front side in the rotation direction of the inclination surface 42 and the inclined surface 43 θ5 The rising angle θ6 of the inclination surface 41

Claims (11)

A center cone that is installed in a processing vessel of an agitation granulator that performs agitation and granulation of powder and is connected to a rotation drive member, and a plurality of blades that are radially attached to the center cone. A stirring blade comprising:
The blade has a working portion recessed on the front side in the rotational direction of the blade,
The stirrer blade is characterized in that the action portion is formed by a plurality of three or more inclined surfaces that are inclined downward in the rotational direction. 2. The stirring blade according to claim 1, wherein the action portion includes a first inclined surface disposed on a bottom surface side of the processing vessel of the blade, and extends upward from an upper edge of the first inclined surface to a tip side of the blade. A second inclined surface, and a third inclined surface extending upward from an upper edge of the first inclined surface and disposed on the center cone side of the second inclined surface,
The agitation blade according to claim 1, wherein the first to third inclined surfaces are in contact with each other at a set point P that forms a vertex of the depression of the action portion.   3. The stirring blade according to claim 1, wherein a turning angle θ <b> 1 of the first to third slopes at the gathering point P is less than 360 °.   The stirring blade according to any one of claims 1 to 3, wherein each of the first to third slopes surrounding the gathering point P has an angle on the front side in the rotational direction that is less than 180 °. Characteristic stirring blade.   The stirring blade according to any one of claims 1 to 4, wherein the first inclined surface is inclined by 1 ° to 15 ° with respect to a bottom surface of the processing vessel.   The stirring blade according to any one of claims 1 to 5, wherein an angle of the front side in the rotation direction formed by the second slope and the first slope is 105 ° to 175 °.   The stirring blade according to claim 6, wherein an angle formed between a leading edge of the first inclined surface in a rotation direction and an upper edge of the first inclined surface that is in contact with the second inclined surface is 10 ° to 75 °. Wings.   The stirring blade according to any one of claims 1 to 7, wherein an angle on a front side in a rotation direction formed by the third slope and the first slope is 95 ° to 175 °.   The stirring blade according to any one of claims 1 to 8, wherein an upper edge of the stirring blade and a front edge in the rotation direction of the first slope are substantially parallel. An agitation granulator comprising a processing container for storing a powder and a stirring blade disposed in the processing container, and stirring and granulating the powder by rotating the stirring blade. And
The stirring blade has a center cone connected to a rotation drive member, and a plurality of blades attached radially to the center cone,
The blade has a working portion recessed on the front side in the rotational direction of the blade,
The agitation granulator is characterized in that the action part is formed by a plurality of three or more inclined surfaces that are inclined downward in the rotation direction. 11. The agitation granulator according to claim 10, wherein the action portion includes a first slope disposed on a bottom surface side of the blade and a tip of the blade extending upward from an upper edge of the first slope. A second slope disposed on the side, and a third slope disposed on the center cone side of the second slope extending upward from an upper edge of the first slope,
The agitation granulator according to claim 1, wherein the first to third slopes are in contact with each other at a gathering point P that forms the apex of the depression of the action portion.

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