JP3190999B2 - Rotary impeller agitation granulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary blade type stirring and granulating apparatus for performing a granulation process by rotating a rotary blade in a stirring tank.

[0002]

2. Description of the Related Art Conventionally, in the pharmaceutical and food industries, for example, a rotary blade type stirring granulator as shown in FIG.
In this rotating blade type stirring granulator, the rotating shaft 13 projects into the stirring tank 8 from the bottom wall 8c of the substantially cylindrical stirring tank 8 having a small diameter on the upper side, and the rotating blade 2 is attached to the tip of the rotating shaft 13. At the same time, the chopper shaft 90
Are protruded in the horizontal direction, and a chopper blade 91 is attached to the tip of the chopper shaft 90.

When the rotating blades 2 are rotated in the horizontal direction around the center C of the stirring tank 8, the raw material particles in the stirring tank 8 are moved in the radial direction by the centrifugal force of the rotation, and the scooping surface of the rotating blades 2 is moved. It is jumped up by 17. Therefore, the centrifugal force and the rising force are applied to the raw material particles in the stirring tank 8, and the raw material particles swirl on the bottom wall 8 c of the stirring tank 8 as shown by an arrow 92 in FIG. Along with the movement, a reversal movement in the radial direction as indicated by an arrow 93 in FIG. 13B is repeated. The raw material particles swirling and reversing in this manner are supplied to the binder supply port 9.
The chopper blade 9 is condensed by the binder liquid supplied from the mixing tank 4 and rotates in the outer region I of the stirring tank 8.
1 to produce product particles of a desired size according to the set number of rotations of the chopper blade 91.

[0004]

However, if a large lump commonly called lump wetted by the binder liquid is generated during the stirring process, the lump 95 is heavy, as shown in FIG. Since the particles are strongly shaken off by the particles and bounce off vigorously on the inner peripheral wall of the stirring tank 2, FIG.
As shown in (A), near the center of the stirring tank 2, that is, the inner region
Lama 95 will easily gather in II.

[0005] In the inner region II of the stirring tank 8,
Since the peripheral speed of the rim 95 is small and the centrifugal force is small, the lumps 95 gathered in the inner area II are less likely to move in the radial direction, and stay at the inner area II. In this state, the lumps 95 are not crushed because they are located far from the chopper blades 91, and are discharged close to the lumps 95 even after the granulation time is completed, thereby improving the uniformity of the particle diameter of the product particles. There was a problem that it was not possible.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a rotating blade type stirring granulator capable of maintaining the particle size distribution of product particles in a narrow range and improving the uniformity of the particle size. The purpose is to provide.

[0007]

As means for achieving the above object, the present invention provides two different configurations. The rotary blade type stirring granulator according to claim 1 (first invention) will be described with reference to, for example, FIG. 1. In a rotary blade type stirring granulation apparatus configured to penetrate the central portion of the wall 8c and protrude into the stirring tank 8 and attach the rotary blade 2 to the protruding tip of the rotary shaft 13, the central mounting portion of the rotary blade 2 The chopper shaft 5 is pivotally supported between the lower half peripheral walls 8b from which the base member 14 has been removed, and the outer blades 23a and 23b are fixed to the chopper shaft 5 in the outer region I of the stirring tank 8 and the inside of the stirring tank 8 In region II, the inner blades 24a and 24b are fixed to the chopper shaft 5, and a driving means 6 for rotating the chopper shaft 5 is provided on one side of the chopper shaft 5.

A rotary blade type stirring granulator according to a second aspect (second invention) will be described with reference to FIGS. 8 to 10, for example. In the rotating blade type stirring granulating apparatus configured to penetrate the central portion of the bottom wall 8c of the stirring tank 8 and project into the stirring tank 8, and to attach the rotary blade 2 to the protruding tip of the rotating shaft 13, the stirring tank An outer blade 77 rotatably driven by a short-axis chopper shaft 76 protruding from the lower half peripheral wall 8 b of the stirring tank 8 toward the center C of the stirring tank 8 toward the outer region I of the stirring tank 8, and the lower half peripheral wall of the stirring tank 8 8b to the center C of the stirring tank 8 inside the stirring tank 8
And an inner blade 71 rotatably driven by a long-axis chopper shaft 55 protruding to the left.

[0009]

In the rotary blade type stirring granulator according to the first aspect, the chopper shaft 5 is rotatably supported between the lower half peripheral walls 8b of the stirring tank 8 at both ends in a state where both ends are supported. Even when the chopper shaft 5 is rotated by 3, vibration is suppressed because the both ends are supported in a stable state. Also,
By providing the outer blades 23a and 23b in the outer region I of the stirring tank 6 and the inner blades 24a and 24b in the inner region II, the swirling and reversing raw material particles are respectively formed in the outer region I and the inner region II. Can be crushed. Therefore, as compared with the configuration in which the chopper blades are provided only in the outer region I, lumps that easily accumulate in the inner region II of the stirring tank 8 can be reliably ground by the inner blades 24a and 24b.
The particle size distribution of the product can be kept within a narrow range.

In the rotary blade type stirring granulation apparatus according to the second aspect, the raw material particles turning and reversing in the outer region I of the stirring tank 8 are supplied to the outer blades 7 attached to the short-axis chopper shaft 76.
The raw material particles that are disintegrated by the rotating chopper 7 and swirl and invert in the inner region II of the stirring tank 8 form a long-axis chopper shaft 55.
Crushed by the inner blades 71 attached to the fins. Therefore, as compared with the configuration in which the chopper blades are provided only in the outer region I, lumps that easily accumulate in the inner region II of the stirring tank 8 can be reliably pulverized by the inner blades 71, and the particle size distribution of the product can be kept in a narrow range. Can be.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a rotary blade type stirring granulator according to the present invention. FIG. 1A is a partially cross-sectional plan view showing an embodiment of the first invention, FIG. 1B is a partially longitudinal front view thereof, FIG. 2 is a longitudinal sectional view of a base end portion of a rotor, FIG. FIG. 3 is a vertical cross-sectional view of the tip of the rotor.

The rotary blade type stirring granulator 1 includes a rotary blade 2
A stirrer tank 8 is disposed in the upper left half of a machine base 7 containing a main motor 3 for driving the motor, a speed reducer 4 directly connected to the main motor 3, and a sub motor 6 for rotating and driving the chopper shaft 5. It is.
In the stirring tank 8, the upper half peripheral wall 8a is formed in an upper tapered shape, and the lower half peripheral wall 8b is formed by a cylindrical wall. The opening 11 is covered. A rotating shaft 13 protrudes from below at a central portion of the bottom wall 8c of the stirring tank 8 via a predetermined sealing mechanism, and the rotating blade 2 is detachably attached to a tip portion of the rotating shaft 13.

The rotary wing 2 has an annular center mounting portion 14.
3, and three wing pieces 15 extending linearly in the centrifugal direction are formed. Each wing piece 15 is provided with a flip-up portion 16 that curves upward at a tip end portion 18 as shown in FIG. 3. Further, a scooping surface 17 for scooping up the powder in the stirring tank 8 is formed on the inclined surface of the rotating blade 2 on the side of the traveling direction P. The scooping surface 17 is closer to the mounting portion 14 at the tip end portion 18 of the blade piece 15 when the scooping angle θ (indicated by angle θ1 in FIG. 3) from the bottom wall 8c of the stirring tank 8 is in the range of 20 ° to 25 °. In the base end portion 19, the scooping angle θ (indicated by an angle θ2 in FIG. 2) is provided in the range of 30 ° to 45 °, and formed so as to become larger as it approaches the base end portion 19 from the front end portion 18. Have been.

Further, each wing piece 15 can be separated into three parts by a center mounting part 14, so that each wing piece 15 can be easily and detachably attached to the rotating shaft 13 even when the chopper shaft 5 described later is laid horizontally. Is available. In addition, each wing piece 15
Can be easily separated from the small-diameter inlet 11 of the stirring tank 8. A conical cover 20 is mounted on the center mounting portion 14 of the rotary blade 2 so that the raw material particles which rise and reverse by the rotary blade 2 are guided again to the inner region II of the stirring tank 8.

Further, between the lower half peripheral wall 8b of the stirring tank 8 which does not pass through the center mounting portion 14 so that the center mounting portion 14 of the rotary blade 2 does not interfere with the chopper blade, that is, the diameter K of the stirring tank 8
A shorter length L of the chopper shaft 5 is supported between the lower half peripheral walls 8b with both ends supported. A drive shaft 6a of the sub motor 6 is connected to one end of the chopper shaft 8 directly or via a speed reducer, and the rotational speed of the chopper shaft 5 is set to 600 rpm.
It can be changed in the range of ３3600 rpm.

Two types of chopper blades are attached to the chopper shaft 5. One is outer blades 23a and 23b mounted near both ends of the chopper shaft 5, and the other is inner blades 24a and 24b mounted closer to the center. A total of two outer blades 23a and 23b are provided, one at each end of the chopper shaft 5, and when the outer blades 23a and 23b are granulating blades, the blades bent toward the inside of the stirring tank 8 are provided. Has been adopted. Two inner blades 24a and 24b are provided in the inner region II of the chopper shaft 5 at a predetermined interval f (FIG. 1).
(See FIG. 2A), the inner blades 24a, 24
When b is a granulating blade, a blade bent at both ends of the chopper shaft 5 is employed. The diameters of the inner blades 24a and 24b are set so as not to interfere with the rotary blade 2.
It is set smaller than the blade diameter of 3a, 23b.

The types of the chopper blades attached to the chopper shaft 5 include a straight plate-shaped cutter blade for the purpose of fine grains, and granulation by scattering raw material particles while cutting, as shown in FIG. The shape of the blades and product particles becomes star-shaped, and dissolver blades suitable for tablet granules can be adopted. By attaching the blades for each purpose to the horizontally mounted chopper shaft 5, the function can be changed according to the intended use. It has become.

FIG. 4 is a partially enlarged longitudinal sectional view illustrating an example of a mounting structure of a chopper shaft supported at both ends and a mounting structure of an inner blade and an outer blade. FIG. 5A is a view of the chopper shaft viewed from a base end side. FIG. 5B is a diagram showing an example of an inner blade attached to a chopper shaft. As shown in FIG.
A pair of openings 25 for inserting the chopper shaft 5 at both ends thereof are provided at predetermined positions of the lower half peripheral wall 8b so as to face each other. FIG. 4 shows only the opening 25 on one side (right side). The diameter D1 of each opening 25 is the chopper shaft 5
D1> d so that the diameter d3 of the central portion 5a of the
3 is set.

The center portion 5a of the chopper shaft 5 is a hollow pipe, and the weight of the center portion 5a is reduced to prevent vibration. A bearing boss 26 projects outward from the lower half peripheral wall 8b so as to surround the opening 25. A bearing member 27 that supports the chopper shaft 5 is inserted into the bearing boss 26. At the same time, it is configured to be fixed to the bearing boss 26 by the mounting flange 28 of the shaft support member 27.

The shaft support member 27 has a shaft hole 2 penetrating in the longitudinal direction.
9 and the base end 5 c of the chopper shaft 5 inserted into the shaft hole 29 is connected to the base ball bearing 30 and the center bush 3.
1 supports it rotatably. An oil seal mechanism 32 is provided inside the base end ball bearing 30, and air is sent to the gap 33 between the oil seal mechanism 32 and the center bush 31 by applying pressure through an air passage 34. Since the pressurized air overflows from the center bush 31 into the stirring tank 8, the raw material particles in the stirring tank 8 are prevented from entering the shaft hole 29.

The chopper shaft 5 includes a central portion 5a having a diameter d3, an intermediate portion 5b having a diameter d2, and a diameter d1 from the center side of the diffusion tank 8.
The base end 5c is formed so that the diameter becomes gradually smaller. A large square fitting portion 38 that fits with the square shaft hole 37 of the inner blades 24a and 24b (see FIG. 5B) is formed at the connection between the central portion 5a and the intermediate portion 5b. On the outer side of the portion 38, an inner male screw portion 39 is threaded. Further, a small square fitting portion 40 that fits into a square shaft hole of the outer blades 23a and 23b is provided at a connection portion between the intermediate portion 5b and the base end portion 5c. Has an external male screw portion 41 threaded.

As described above, from the center side of the diffusion tank 8, the diameter d3
The center blade 5a, the middle portion 5b having a diameter d2, and the base end portion 5c having a diameter d1 have a gradually decreasing diameter.
b, the process of attaching the outer blades 24a and 24b and the process of attaching the chopper shaft 5 to the stirring tank 8 can be simplified. That is, first, the chopper shaft 5 is inserted into the stirring tank 8 from the opening 25 provided in the lower half peripheral wall 8b. In this case, since the center portion 5a having the largest diameter has the diameter d3, it can be easily inserted through the opening 5 having the diameter D1.
From this state, the chopper shaft 5 is shifted to the right opening 25, and the inner blade 24b is fitted to the left large square fitting portion 38,
The inner blade 24 b is fixed to the chopper shaft 5 by screwing the left inner tightening nut 42 through the chopper shaft 5.

Further, the chopper shaft 5 is shifted to the left opening 25 to fit the inner blade 24a into the right large square fitting portion 38, and the inner blade 4a is fixed to the chopper shaft 5 by the right inner tightening nut 42. . Also, the outer blades 23a, 23b
Similarly, in the case of
5. By shifting to the left opening 25, the outer blades 23a, 23b and the outer tightening nuts 43, 43 are passed through the chopper shaft 5, and the small square fitting portions 40, 40 of the chopper shaft 5 are respectively formed by the outer tightening nuts 43, 43. The outer blade 23a,
23b is attached. And the bearing bosses 26, 2 on both sides
6 and the drive shaft 6a of the auxiliary motor 6 is connected to the right end of the chopper shaft 5,
Finish the installation.

As described above, the inner blade 24 is attached to the chopper shaft 5.
The inner blades 24a, 24b and the outer blades 23a, 23b can be securely and securely fixed to the chopper shaft 5 by sequentially fixing the inner blades 24a, 24b and the outer blades 23a, 23b with the tightening nuts 42, 43. In FIG. 1, the inner blades 24a, 24b and the outer blades 23a, 23
Although the case where the number of the blades 3b is one is shown, an inner blade in which a plurality of blades are stacked or an outer blade in which a plurality of blades are stacked may be used. It is not necessary to connect the left support member 27 to the auxiliary motor 6, so the right support member 27 is not required.
The structure can be simpler than that of In addition, the left support member 27 is also configured to overflow the pressurized air.

Next, the operation of the rotary blade type stirring granulator of this embodiment shown in FIGS. 1 to 4 will be described. When the rotor 2 is rotated by the main motor 3 and the chopper shaft 5 is rotated by the sub motor, the raw material
As shown by the arrow, while rotating inside the stirring tank 8 around the rotating shaft 13, the inverting motion shown by the arrow 93 is repeated by the rising force. And two outer blades 23a, 23b
In the region I outside the stirring tank 8, the raw material particles are crushed and sized. In the present embodiment, since the inner blades 24a and 24b are provided in the inner region II of the stirring tank 8, particles having a large particle diameter (dama) staying in the inner region II are removed as shown by a dotted arrow 46 in FIG. I can be guided to extrude.

In the inner region II, the inner blades 24a,
By rotating 24b, particles having a large particle diameter can be directly crushed, and by rotating the chopper shaft 5 in the direction of arrow 47 in FIG. The area I can be scraped. As described above, the inner blades 24a and 24b have a crushing function for crushing particles staying in the inner region II and the outer region I.
Since it has a function of sending out particles to the outside, as shown in FIG. 13, the uniformity of the particle diameter can be improved as compared with an apparatus configuration having only the chopper blade 91 in the outer region I. That is, as compared with the particle size distribution curve 48 of the conventional device shown in FIG. 6, the particle size distribution curve 49 of the present embodiment can be defined in a narrow particle size range, and the performance as the device can be improved.

Further, since the chopper shaft 5 is supported at both ends, there is little blur due to rotation, and a stable crushing and sizing action can be exhibited. In addition, as shown in FIGS. 2 and 3, the scooping angle θ of the scooping surface 17 of the rotor 2 is
5 has an attachment portion 1 within the range of 20 ° to 25 °.
At the base end 19 closer to 4 degrees, it is provided in the range of 30 to 45 degrees,
In addition, since it is formed so that the angle becomes larger as approaching from the distal end portion 18 to the proximal end portion 19, even if the peripheral speed is slow in the inner region II, the raw material particles in the stirring tank 8 are strongly scooped up and mixed by stirring. Can be.

That is, by employing the rotary blade 2 of this embodiment, the scooping force can be increased even in the inner region II of the stirring tank 8, so that the inner blades 24a, 24b
The crushing function and the function of sending the raw material particles to the outer region I can be further improved, and the sizing performance of the apparatus can be improved.

As a modification of this embodiment, FIG.
In addition to the configuration shown in FIG. 7, there is a configuration in which the mounting form of the outer blade 23 and the inner blade 24 is changed as shown in FIGS. 7 (A) and 7 (B). FIG. 7 (A) shows that the inner blade 24a and the outer blade 23a are attached only to the right semicircular portion of the stirring tank 8, and the swirling direction flow 92 formed by the rotary blade 2 (FIG. 1 (A)).
(See Reference), the rotation direction of the inner blade 24a and the outer blade 23a is characterized by being one direction. On the other hand, as shown in FIG. 1, when the inner blades 24a and 24b and the outer blades 23a and 23b are attached to both the left and right sides, the inner blade 24a and the inner blade 24b,
There is a feature that the outer blade 23a and the outer blade 23b rotate in opposite directions.

FIG. 7 (B) shows only the outer blade 23a attached to the right semicircle of the stirring tank 8, and the inner blade 24 attached to the left semicircle.
The configuration is such that only b is attached. This configuration is characterized in that the center of gravity of the chopper shaft 5 is improved because the blade is not attached to only one side as shown in FIG. 7A and 7B, the number of blades attached to the chopper shaft 5 is smaller than that of the configuration shown in FIG. 1, so that there is an advantage that the weight can be reduced and suitable for high-speed rotation.

The rotary blade type stirring granulator according to the present embodiment is also used in the case of performing granulation of particles subsequent to the mixing of powders and granules. Since there are various conditions such as types, FIGS. 1 and 7
It is not easy to predict which of the configurations shown in FIG. 7A and FIG. 7B is suitable, and experiments should be appropriately performed in accordance with the form to be actually used, the material particles, and the properties of the powder. It is preferable to select the optimal configuration by performing the above.

[0032]

FIG. 8 is a partial cross-sectional plan view showing an embodiment of the second invention, FIG. 9 is a longitudinal sectional view of a long-axis chopper, and FIG.
(A), (B) is a figure for demonstrating the effect | action of 2nd invention. As shown in FIG. 8, the rotary blade type stirring granulator according to this embodiment includes an inner region II of the stirring tank 8 in addition to a short axis chopper 51 disposed for an outer region I of the stirring tank 8. A long-axis chopper 52 provided as an object is provided. The long axis chopper 52 is the short axis chopper 51
A chopper blade smaller than the chopper blade of the short-axis chopper 51 is attached to the tip end portion. Both the short-axis chopper 51 and the long-axis chopper 52 are arranged so as to face the center C of the stirring tank 8, and the arrangement angle の (see FIG. 10B) between the long-axis chopper 52 and the short-axis chopper 51 is It is set in the range of 20 ° to 35 °.

The reason why the blade of the long axis chopper 52 is formed in a small size is that the scooping surface 17 of the rotary blade 2 is higher toward the center C so that it does not interfere with the rotary blade 2. Since the range in which the raw material particles are scattered in the inner region II is limited to a narrow range (indicated by t in FIG. 10) as shown by the line 80 in FIG. This is for improving the crushing efficiency of the lumps 95 by rotating the chopper blades.

As shown in FIG. 9, lower half peripheral wall 8 of stirring tank 8 is provided.
An opening 53 is provided at a predetermined position b to allow the long-axis chopper 52 to protrude into the stirring tank 8 from the outside, and a bearing boss 54 protrudes outward so as to surround the opening 53. Long shaft chopper shaft 5
The bearing member 56 that supports the shaft 5 is provided with a shaft hole 54 of the bearing boss 54.
a, and is fixed to the bearing boss 54 by the mounting flange 57 of the shaft support member 56. The shaft support member 56 has a shaft hole 58 penetrating in the longitudinal direction, and the shaft hole 5
8 with the long-side chopper shaft 55
9. The base end side ball bearing 60 rotatably supports.

The base end of the shaft hole 58 is formed to have a large diameter, and the tip end of the shaft hole 58 is formed to be a shaft through hole 61 having a diameter slightly larger than the long shaft chopper shaft 55. An air passage 64 is communicated with a gap 63 between an oil seal mechanism 62 provided at a base end of the shaft through hole 61 and a distal bush 59, and air is sent to the air passage 64 by applying pressure to the air passage 64. The structure is such that the pressurized air overflows from the gap between the tip side bush 59 and the long shaft chopper shaft 55 to prevent powder from entering the shaft through hole 61.

The shaft support member 56 has an extending portion 65 protruding into the stirring tank 8 from the front end side, an insertion portion 66 inserted in a state of being fitted into the shaft hole 54a of the bearing boss 54, and a motor side. And a base end 69 having a connection flange 68 fixed to the flange 67. At the end of the long shaft chopper shaft 55 protruding from the end of the extending portion 65 of the shaft support member 56, a square fitting portion 70 as described in FIG. Are alternately inserted into the square fitting portion 70 via the spacer 72, and are fixed to the long-axis chopper shaft 55 by the cap nut 73 at the foremost portion. The drive shaft of the long-axis chopper motor 74 shown in FIG. 8 is inserted into the base end side and connected to the long-axis chopper shaft 55, so that the rotational driving force of the long-axis chopper motor 74 is reduced. 55.

With the long axis chopper 52 having such a configuration, the insertion portion 66 of the shaft support member 56 is supported over the length M by the shaft hole 54a of the bearing boss 54. Even if the number of rotations of the long-axis chopper shaft 55 is increased, it is possible to minimize the vibration caused by the rotation of the inner blade 71 to sway the extension portion 65, and to exert a stable chopper function. Further, since the long-axis chopper shaft 55 is pivotally supported by the base-side ball bearing 60 and the distal-side bush 59, the horizontal swing of the long-axis chopper shaft 55 can be suppressed to a minimum even when the rotation speed is increased. As shown in FIG. 8, an outer blade 77 as shown in FIG. 13 is attached to the tip of the short axis chopper shaft 76 of the short axis chopper 51, and is driven to rotate by the short axis chopper motor 78. ing.

The operation of the present embodiment will be described with reference to FIG. FIG. 10 (A) is a longitudinal sectional view showing an ideal range of the raw material particles at the time of granulation, and shows the rotation shaft base end 79 of the rotary blade 2 and the upper end of the outer blade 77 of the short shaft chopper 51. The rotation speed of the rotary blade 2 is adjusted so that the raw material particles are distributed in the connecting line 80, so that the outer blade 77 can sufficiently exhibit the crushing function. In this case, the short axis chopper 51
10B, the outer region I and the inner region
It is necessary that the outer blade 77 has a function of crushing and sizing in a wide range of II. However, as described above, since the circumferential speed of the rotor 2 is low in the inner region II, lumps having a large particle diameter stay in the inner region II.

Therefore, in this embodiment, the inner region II is replaced with the inner region II.
By providing the long-axis chopper 52 for rotating the dedicated inner blade 71, the functions of the crushing and sizing process in the inner region II and the crushing and sizing process in the outer region I are separated. By providing a dedicated inner blade 71 in the inner region II and setting the rotation speed of the long-axis chopper motor 74 to a rotation speed that improves the sizing distribution, lumps staying in the inner region II can be crushed, The burden of sizing by the outer blades 77 can be reduced, and the uniformity of the particle size of the product particles can be increased.

Since the extended portion 65 of the long axis chopper 52 that supports the inner blade 71 projects into the stirring tank 8, the influence of the turning direction by the extended portion 65 of the long axis chopper 52 is reduced. As a result, the outer blade 77
Is set first, and the arrangement order of the short-axis chopper 51 and the long-axis chopper 52 in the circumferential direction of the stirring tank 8 is set in accordance with the rotation direction of the rotary blade 2 so that the inner blade 71 comes into contact next.

However, the short axis chopper 51 and the long axis chopper 5
2, the influence of the extending portion 65 of the long axis chopper 52 decreases as the arrangement angle ψ of the second axis increases. Therefore, as shown in FIG. 11, the arrangement angle of the short axis chopper 51 and the long axis chopper 52 is 180 °. , As shown in FIG.
1. In the configuration in which the disposition angle of the long axis chopper 52 is 90 °, the disposition order does not matter. When it is desired to separate the short-axis chopper 51 and the long-axis chopper 52 from each other for a special reason, a configuration in which the arrangement angle shown in FIG. 11 is 180 ° is adopted. The configuration shown in FIG. 8 can make the device most compact.

The present invention is not limited to the above embodiment, and various design changes can be made without departing from the spirit of the present invention. For example, the rotary blade type stirring granulation apparatus of the above two inventions is an apparatus mainly used for granulating particles, but also in a step of mixing two or more powders before granulation, Can be improved. In the above two inventions,
The configuration of the inner blade and the outer blade, for example, the type of the blade and the number of the blades can be changed as appropriate. Furthermore, in the above-described embodiment, the stirring tank 8 in which the upper half peripheral wall 8a is inclined inward is illustrated, but the effect of the present invention can be obtained even with a stirring tank configured only with a cylindrical peripheral wall. is there.

[0043]

As described in the above operation, according to the first aspect of the present invention, the chopper shaft is laid across the peripheral wall of the stirring layer, the outer blade is provided in the outer region of the stirring tank, By providing the inner blades in the region, in the outer region and the inner region, swirling and reversing raw material particles can be disintegrated by the respective blades, and the particle size distribution of the product is kept in a narrow range. And has a specific effect that the uniformity of the particle size can be improved.

According to the second aspect of the invention, the raw material particles turning and reversing in the outer region of the stirring tank are broken by the outer blades, and the raw material particles turning and reversing in the inner region of the stirring tank are also separated by the inner blades. Since it can be disintegrated, the particle size distribution of the product can be kept within a narrow range, and the specific effect of improving the uniformity of the particle size can be obtained.

[Brief description of the drawings]

FIG. 1A is a partially cross-sectional plan view showing an embodiment of the first invention, and FIG. 1B is a partially longitudinal front view thereof.

FIG. 2 is a longitudinal sectional view of a base end portion of a rotor.

FIG. 3 is a vertical cross-sectional view of a tip portion of a rotary wing.

FIG. 4 is a partial longitudinal sectional view of a lower half peripheral wall of a stirring tank.

FIG. 5A is a view of a chopper shaft viewed from a base end side,
FIG. 5B is a diagram illustrating an example of the inner blade attached to the chopper shaft.

FIG. 6 is a graph in which the horizontal axis represents the particle size and the vertical axis represents the appearance rate.

FIGS. 7A and 7B are diagrams for explaining another embodiment of the first invention. FIG.

FIG. 8 is a partial cross-sectional plan view showing an embodiment of the second invention.

FIG. 9 is a longitudinal sectional view of a long-axis chopper.

FIGS. 10A and 10B are diagrams for explaining the operation of the second invention.

FIG. 11 is a schematic diagram for explaining another form of arrangement of the short axis chopper and the long axis chopper.

FIG. 12 is a schematic diagram for explaining another embodiment of the arrangement of the short-axis chopper and the long-axis chopper.

FIG. 13 (A) is a partial cross-sectional plan view of a conventional rotary blade type stirring granulation apparatus, and FIG. 13 (B) is a partial longitudinal front view thereof.

[Explanation of symbols]

Reference numeral 2: rotating blade, 3: main motor, 5: chopper shaft, 6: sub motor, 8: stirring tank, 8a: upper half peripheral wall, 8b: lower half peripheral wall, 8c: bottom wall, 13: rotary shaft, 14 … Center mounting part, 2
3a, 23b: outer blades, 24a, 24b: inner blades,
55: long axis chopper axis, 71: inner blade, 76: short axis chopper axis, 77: outer blade, I: outside area of the stirring tank, II:
Area inside the stirring tank, C: center of the stirring tank.

Claims (2)

(57) [Claims] 1. A tip of a rotating shaft (13) rotated by a driving means (3) penetrates a central portion of a bottom wall (8c) of a stirring tank (8) and projects into a stirring tank (8). And a lower half portion of the rotary blade-type agitation and granulation apparatus having a rotary blade (2) attached to a protruding tip of the rotary shaft (13), with a center mounting portion (14) of the rotary blade (2) removed. The chopper shaft (5) is supported between the peripheral walls (8b) in a state where both ends are supported, and the outer blades (23a) and (23b) are fixed to the chopper shaft (5) in the outer region (I) of the stirring tank (8). Driving means for fixing the inner blades (24a) and (24b) to the chopper shaft (5) in the inner region (II) of the stirring tank (8) and rotating the chopper shaft (5) on one side of the chopper shaft (5) (6) A rotating blade type stirring granulation apparatus characterized by including (6). 2. A tip of a rotating shaft (13) rotated by a driving means (3) penetrates a central portion of a bottom wall (8c) of a stirring tank (8) and projects into the stirring tank (8). In the rotary blade type stirring granulator configured by attaching the rotary blade (2) to the protruding tip of the rotary shaft (13), the stirring tank (8) is moved from the lower half peripheral wall (8b) of the stirring tank (8). ), An outer blade (77) rotatably driven by a short axis chopper shaft (76) protruding toward the outer region (I) of the stirring tank (8) toward the center (C), and a lower half of the stirring tank (8). Peripheral wall (8b)
And an inner blade (71) rotatably driven by a long-axis chopper shaft (55) protruding toward the center (C) of the agitating tank (8) from the front to the inner region (II) of the agitating tank (8). Rotary impeller type stirring granulator.