JP2011206631A - Stirring blade, and stirring granulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easily handleable stirring blade of a lighter weight while improving its stirring efficiency and preventing a raw material from sticking thereto, and to enhance working efficiency in operating a stirring granulator.SOLUTION: The stirring blade 3 disposed in a stirring granulator that stirs powder to convert the same into granules, includes a center cone 31 and a plurality of blades 32 radially disposed on the outer circumference thereof. A bent part 41 is formed on the end part of each of the blades 32 by bending the angular corner part of the end part thereof in the upward direction. The upper-end edge 48 of the bent part 41 extends outside in the radial direction in a manner of tilting upward from the rear-end edge 43 of a slope 40, allowing the bent part 41 to stand upward on the end part of the blade 32. The bent part 41 is formed by bending the end part of the blade 32 along a line segment M connecting a pair of bend points P, Q. The angle θ3 formed between the line segment M and the front-end edge 45 of the slope 40 is set in a range of 10 to 80°.

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 an agitation granulator for agitation and granulation of powder particles, a center cone connected to a rotation drive member, and a plurality of blades radially attached to the center cone The blade includes a slope portion extending in a radial direction from the center cone and having a downward slope in a rotational direction, and a rear side in the rotational direction of the blade tip portion. And a small wing portion that rises upward from the slope portion.

  In the present invention, during the agitation / granulation treatment or the like, the granular material being treated is lifted upward by the small blade portion and guided to the center side. 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.

  In the stirring blade, an angle θ1 formed between the small blade portion and the back surface of the slope portion may be 5 ° to 80 °. Further, the angle θ2 formed by the slope portion with respect to the horizontal plane may be 5 ° to 60 °, and the sum of the angle θ2 and the angle θ1 may be less than 90 °. Further, a bending point P is set on the front side in the rotational direction of the blade tip, and a bending point Q is set on the rear end edge of the slope portion, and a line segment M connecting the bending point P and the bending point Q is used as a boundary. The small blade portion may be formed on the radially outer side of the slope portion, and an angle θ3 formed by the line segment M and the front edge of the slope portion may be 10 ° to 80 °.

  An upper end edge of the small wing portion may extend from the rear end edge of the slope portion while being inclined upward in the radial direction. Moreover, you may provide the bending part formed by bending the said corner part upwards as the said wing part. Further, the small wing portion may be formed in a range of 1/3 from the tip with respect to the entire length of the blade.

  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. A stirring granulator that performs granulation, wherein the blade extends from the center cone in a radial direction and has a slope portion that is inclined downward in the rotation direction, and a rotation direction of the blade tip portion A small wing portion provided at a rear corner portion and rising upward from the slope portion.

  In the present invention, during the agitation / granulation treatment or the like, the granular material being treated is lifted upward by the small blade portion and guided to the center side. Thereby, the granular material pressed against the side wall of the processing container is reduced, and the adhesion of the raw material to the side wall of the processing container is suppressed.

  In the agitation granulator, the upper end edge of the small wing part may extend from the rear end edge of the slope part while being inclined upward in the radial direction. Moreover, you may provide the bending part formed by bending the said corner part upwards as the said wing part.

  According to the stirring blade of the present invention, since the small blade portion rising upward is provided at the tip portion of the blade, the powder body being processed by the small blade portion during the stirring / granulation processing or the like. Can be moved upward. 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. Further, by providing the small blade portion 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 that performs agitation, granulation, etc., with the agitation blade on the granular material accommodated in the processing container, Since the small blade portion that rises toward the surface is provided, it is possible to move the granular material being processed upward by this small blade portion during the stirring and granulation processing. 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. Further, by providing the small blade portion 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 one Example of this invention. It is a perspective view which shows the structure of a stirring blade. It is sectional drawing which shows the structure of a center cone. It is explanatory drawing which shows the structure of a braid | blade, and has shown the state which looked at the braid | blade front-end | tip part from the rotation direction side. It is explanatory drawing which shows the structure of a braid | blade, and has shown the state which looked at the braid | blade front-end | tip part from diagonally upward (arrow S of FIG. 4).

  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 which is an embodiment 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.

  4 and 5 are explanatory diagrams showing the configuration of the blade 32. The blade 32 includes a sloped portion 40 extending in the radial direction from the center cone 31 and a bent portion (small wing portion) 41 provided at a corner corner K on the rear side in the rotational direction of the blade tip portion. Has been. The slope portion (first slope) 40 has a downward slope toward the rotation direction. The bent portion 41 is formed at the tip end portion of the blade 32 along the line segment M in FIG. The rotation direction facing surface of the bent portion 41 is a guide surface (second inclined surface) 42 that rises at a larger angle than the inclined surface portion 40 with respect to the horizontal plane.

  In this case, the line segment M is a line segment connecting the bending point P on the front side in the rotational direction of the blade tip portion and the bending point Q on the rear end edge 43 of the blade portion 40 set to form the bent portion 41. It is. In this embodiment, the apex 44 on the leading side in the rotational direction of the blade tip is set as a point P, and the bent portion 41 is provided in such a manner that the corner corner K is folded inwardly, that is, toward the center cone 31 with reference to this point P. ing. If the point P is set on the outer edge 46 of the blade 32, the same state is obtained, but considering the action and effect of the bent portion 41, the point P is preferably set at the vertex 44.

  An angle θ1 (bending portion rising angle) formed by the bent portion 41 and the back surface of the blade 47 (surface on the back side in the rotation direction of the slope portion 40) is 5 ° to 80 °, preferably 20 ° to 60 °. It has become. In addition, an angle θ2 (blade rising angle) formed by the inclined surface portion 40 with respect to the horizontal plane is 5 ° to 60 °, preferably 15 ° to 40 °. The sum of the bent portion rising angle θ1 and the blade rising angle θ2 does not precede the rotational direction by being less than 90 °.

  The bent portion 41 and the slope portion 40 are connected by a curved surface R with the line segment M as a boundary. The line segment M is the center line of the curved surface R. In this way, by joining the bent portion 41 and the inclined surface portion 40 with the curved surface R, the granular material being processed is scooped up by the blade 32 along with the rotation of the stirring blade 3, and smoothly introduced into the bent portion 41 side. Is done. The angle θ3 (folded portion bending angle) formed between the line segment M and the front edge 45 of the inclined surface portion 40 is 10 ° to 80 °, preferably 20 ° to 60 °. It is formed in the range of 1/3 from the tip.

  The point Q is a boundary between the upper end edge 48 of the bent portion 41 and the rear end edge 43 of the slope portion 40. The upper end edge 48 extends (extends) from the outer end of the rear end edge 43 while being inclined upward in the radial direction. In other words, the bent portion 41 rises so that the upper end edge 48 is gently inclined upward from the point Q. Thus, in the stirring blade 3, by providing the bent portion 41 that rises upward in the range of the tip 1/3 of the blade 32 that greatly contributes to the stirring and granulating action, the granular material being processed can be obtained. It can be moved upward.

  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 powder particles being processed are lifted upward by the bent portion 41 and guided to the center side. For this reason, in the case of stirring / granulation processing, etc., it becomes difficult for the granular material to be pressed against the side wall inner surface 11a of the vessel 2, and the adhesion of the raw material to the vessel side wall is suppressed. Further, since the bent portion 41 has a larger upward slope than the slope portion 40, the stirring blade 3 has the powder body upwardly than the bent blade with the tip portion bent in the rotational direction. Therefore, the stirring efficiency and the raw material adhesion suppressing effect are higher than those of the bent blade.

  Further, in the stirring blade 3, the bent portion 41 that contributes as the working surface during processing is provided so as to rise upward from the rear end edge 43 of the slope portion 40, so that the total length (L1 + L2) of the blade 32 is small. It is suppressed to the same extent as a straight-shaped stirring blade having no blade portion, and the tip portion is shorter than the one bent in advance in the rotation direction. For this reason, it is possible to suppress the adhesion of the raw material to the side wall of the vessel by the bent portion 41 without increasing the weight from that of the straight shape, and the weight can be reduced as compared with the latter bent shape blade which is said to have the same effect. .

  Furthermore, since the bent portion 41 having the guide surface 42 that contributes as the working surface is provided to rise from the slope portion 40, the slope portion 40 itself may be low in height, which is higher than that of a conventional straight stirring blade. Also, the width (height) of the slope portion 40 can be reduced. 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 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 bent portion 41 provided at the tip of 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.

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. Further, in the above-described embodiment, the configuration in which the bent portion 41 is provided at the tip portion of the blade 32 as a small wing portion by bending the blade corner K is shown. However, the bent portion 41 is bent at the tip portion of the blade 32. A small wing portion may be formed by attaching a plate-like member having the same shape as the portion 41. In this case, the plate-like member forming the small blade portion is joined to the slope portion 40 by welding, mechanical means such as a bolt or a rivet, and the blade 32 is set at points P and Q with the line segment M as a boundary. Thus, the plate-like member and the inclined surface portion 40 are connected in a bent state. It is also possible to form the blade 32 by casting and integrally form the slope portion and the small blade portion.

  Further, the upper end edge 48 of the bent portion (small wing portion) 41 does not necessarily extend while inclining upward toward the radially outer side, and the upper end edge 48 is not extended to the rear end edge 43 of the slope portion 40. You may form in the same height.

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 Slope part 41 Bent part (small wing part)
42 Guide surface 43 Rear edge 44 Vertex 45 Front edge 46 Outer edge 47 Blade back surface 48 Upper edge K Corner corner M Line segment P Bending point Q Bending point R Curved surface X Bending part tip θ1 Bending part rising angle θ2 Blade standing Raising angle θ3 Bending angle

Claims (10)

A stirring blade installed in an agitation granulator for agitation and granulation of powder and having a center cone connected to a rotation drive member and a plurality of blades radially attached to the center cone Because
The blade is
A slope portion extending in the radial direction from the center cone and having a downward slope toward the rotation direction,
A stirring blade, comprising: a small blade portion provided at a corner corner on the rear side in the rotation direction of the blade tip portion and rising upward from the slope portion.   2. The stirring blade according to claim 1, wherein an angle θ <b> 1 between the small blade portion and the back surface of the slope portion is set to 5 ° to 80 °.   The stirring blade according to claim 2, wherein an angle θ2 formed by the slope portion with respect to a horizontal plane is 5 ° to 60 °, and a sum of the angle θ2 and the angle θ1 is less than 90 °. Agitating blades to do. The stirring blade according to any one of claims 1 to 3, wherein a bending point P is set on the front side in the rotation direction of the blade tip and a bending point Q is set on the rear end edge of the slope portion, and the bending point is set. The winglet portion is formed on the radially outer side of the slope portion with a line segment M connecting P and the bending point Q as a boundary,
An agitating blade characterized in that an angle θ3 formed by the line segment M and the front end edge of the slope portion is set to 10 ° to 80 °.   The stirring blade according to any one of claims 1 to 4, wherein an upper end edge of the small blade portion extends from the rear end edge of the slope portion while being inclined upward in the radial direction. A stirring blade characterized by   The stirring blade according to any one of claims 1 to 5, wherein the blade has a bent portion formed by bending the corner portion upward as the small blade portion.   The stirring blade according to any one of claims 1 to 6, wherein the small blade portion is formed in a range of 1/3 from a tip with respect to a total length of the blade. 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 is
A slope portion extending in the radial direction from the center cone and having a downward slope toward the rotation direction,
A stirrer-granulating apparatus comprising: a small wing portion provided at a corner portion on the rear side in the rotation direction of the blade tip portion and rising upward from the slope portion.   The stirring granulation apparatus according to claim 8, wherein an upper end edge of the small blade portion extends from the rear end edge of the slope portion while being inclined upward in the radial direction. Grain device.   The stirring granulation apparatus according to claim 8 or 9, wherein the blade has a bent portion formed by bending the corner portion upward as the small blade portion.

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