JPH0624619B2 - Granulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is a granulator capable of dry-mixing various raw materials for granules, dispersing and coating liquid on the raw materials for granules, and kneading. For example, for example,
Granulation, granulation in the field of agrochemicals, granulation of wettable powders, food granulation, mixing of body pigments and colored pigments in cosmetics, oil dispersion, and granulation of press molding in the fields of new ceramics and powder metallurgy. Used for.

[Conventional technology]

As a conventional granulator, as shown in FIG. 21 and FIG. 22, a basket-shaped container having a horizontally placed cylindrical container a and a stirring member c concentric with the container a and close to its inner wall. It is proposed that the low-speed rotor b is provided, and one high-speed rotor d having a plurality of impact members e on the outer periphery is arranged inside the low-speed rotor b concentrically or eccentrically with the cylindrical container a. (See, for example, Japanese Patent Publication No. 60-55175).

In this granulator, the 2
The powder raw materials of more than one kind are dispersed and mixed by the low-speed rotor b and the high-speed rotor d, and at a stage when the apparent volume is increased by containing air, a constant flow rate of water or binder is added from the liquid adding means g to the cylindrical container a. The granules are supplied to the inside and granulated, and the granulated product for each batch is taken out from the discharge port h of the cylindrical container a.

[Problems to be Solved by the Invention]

In the fields of medicine, agricultural chemicals, cosmetics, etc., precision mixing and granulation operations are often carried out in batch units, and the production scale used is one with an effective capacity of several 100 liters to 1000 liters. To be Conventionally, when making a mixing granulator of this effective capacity by scaling up from a small tester, the mixing time increases, the yield of granulated products decreases compared to the case of a small tester, and the performance is remarkably high. There was a problem of lowering.

The reason for this is that in the conventional configuration, the batch amount to be processed by the scaled-up cylindrical container a increases in proportion to the cube of the typical size of the container a, whereas the impact member e Since the surface area of the high-speed rotor d that gives effective energy to the raw material in the container a is proportional only to the square of the typical size, the contact probability between the raw material to be processed and the impact member e of the high-speed rotor d decreases. It is possible.

In order to prevent the decrease of the contact probability, if the ratio of the scale-up of the typical size of the high-speed rotor d is increased to the ratio of the scale-up of the typical size of the cylindrical container a or more, the rotation of the high-speed rotor d is caused. As the required power increases significantly, the effective volume of the container a, which is the internal volume of the cylindrical container a minus the volume of the high-speed rotor d, decreases,
Another problem occurs that reduces the processing capacity.

Further, when one high-speed rotor d is provided inside the low-speed rotor b to scale up, the size of the inner wall of the cylindrical container a and the tip of the impact member e protruding from the high-speed rotor d becomes large. Due to the rolling operation of the granulated raw material on the side where the raw material is picked up by the stirring member c of the rotor b, as shown by an arrow A in FIG. 23, the raw material is circulated without contact with the impact member e of the high speed rotor d. The raw material that has been formed or has been dropped by the stirring member c of the low-speed rotor b passes over the high-speed rotor d and circulates without contacting the impact member e of the high-speed rotor d as shown by an arrow B in FIG. There was a problem that parts were formed, and the performance of the scale-up granulator was degraded.

The present invention has been made in view of these circumstances, and even when the apparatus is scaled up, the time required for mixing and the yield of granulated products do not significantly decrease as compared with the performance of a small tester, and It is an object of the present invention to provide a granulator which does not reduce the effective volume of the container.

[Means for Solving the Problems]

In order to achieve the above object, in the present invention, a cylindrical container provided with a raw material inlet and a discharge outlet is provided horizontally or diagonally laterally, and is provided with a stirring member in proximity to the inner peripheral surface of the container. The low-speed rotor is provided through the center of one end surface of the container, and the two high-speed rotors provided with a large number of impact members on the outer peripheral surface of the container are positioned so as to be located inside the stirring member of the low-speed rotor. The liquid adding means, which is provided through the end face side and supplies water or a binder, is provided so as to penetrate the end face side of the container on the side where the high speed rotor is mounted, or the axial center portion of the low speed rotor to form a granulator. ing.

The number of high speed rotors may be three or more.

Further, it is preferable that the adding means is attached in a state of being projected into the container from the end face side of the container to which the high speed rotor is attached.

Further, in order to disperse the liquid from the liquid adding means in the container well and in a short time, the liquid adding means is preferably constituted by a plurality of two-fluid sprays.

Also, in order to adjust the impact force on the raw material according to the characteristics of the granular material to be processed, the impact member of the high-speed rotor is a pin, or a blade straight to the axial direction of the high-speed rotor or inclined with respect to the axial direction. The blade may be a blade or a combination thereof.

Further, the blade of the stirring member attached to the low-speed rotor may have a tip connected to the high-speed rotor drive side, may not be linked, may be straight in the axial direction of the low-speed rotor, or may be twisted. it can.

Then, in order to remove the raw material adhering to the inner wall surface of the container, a scraper adjacent to the inner wall surface may be attached to the stirring member of the low speed rotor.

[Work]

When the granular material is put into the container and the low speed rotor and the two high speed rotors are rotated in the same direction or in different directions, the granular material is dispersed by the strong mixing action of the impact member of each high speed rotor. -The apparent volume is generally increased by the air that is mixed and contained at that time.

When a constant flow rate of water or binder measured in this state is supplied from the liquid adding means, the liquid supplied in the initial stage of the supply is quickly incorporated into the granular material by a rotational interaction between the low speed rotor and the high speed rotor. It is evenly dispersed. As the amount of liquid injected increases, the wetted granular material generally decreases in apparent volume and increases in stickiness and is lifted in the rotation direction of the low-speed rotor, and thereafter, it is moved to the direction shown in FIG. As shown in FIG. 8, it falls in a cascade form on the high-speed rotor inside the low-speed rotor, contacts the impact member of each high-speed rotor, and is subjected to compression / shearing action.

Then, in the entire granulation process, the granular material that has come into contact with the first high-speed rotor that is lifted by the low-speed rotor is blown in the tangential direction of the high-speed rotor and comes into contact with the second high-speed rotor that is close to it again. Therefore, it is subjected to the impact / dispersion action of the second stage.

When the addition is further advanced, the raw material for powder and granules becomes fine granules due to liquid cross-linking, and the apparent volume is further reduced to become granular and fluidity appears.

As a result of the above, the entire powder and granules are uniformly granulated in a short time.

When the number of high-speed rotors is three or more, the uniform granulation action of the entire powder and granules is further promoted by the synergistic effect of impact / dispersion received in each high-speed rotor.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings shown in FIGS. 1 to 9.

In the figure, reference numeral 1 is a cylindrical container for granulation which is horizontally or obliquely arranged horizontally. This container 1 is provided with a raw material charging port 4 equipped with a charging valve in the upper part and a discharge lid in the lower part. A discharge port 5 is provided. A drive means for a low speed rotor is attached to one end face 2 side of the container 1, and a plurality of, for example, two high speed rotor drive means is attached to the other end face 3 side.

On the end face 2 side, a low speed rotor 6 is provided coaxially with the center line of the container 1, and on the end face 3 side, two low speed rotors are provided inside the stirring member 7 eccentric to the center line of the container 1 and attached to the low speed rotor 6. High speed rotors 9 and 9 are provided. As the stirring member 7 of the high-speed rotor 6, a plurality of, for example, three L-shaped members arranged so as to be close to the inner wall surface of the container 1 are attached. By the drive shaft 8 coinciding with the central axis, it is rotated counterclockwise at a low speed of about 8 to 50 rpm, for example, as shown by an arrow P in FIG. The drive shaft 8 is rotatably held by a bearing 10 of a cylindrical casing 17A protruding from the end face 2 side, and is driven by a motor 12 mounted on a base 11 of the container 1 and a speed reducer 13 coupled to the motor 12. , Is rotated at a low rotation speed set via the power transmission means 14. A stirring member 7 attached to the low-speed rotor 6
Is not limited to the L-shaped member, and other structures can be used.

The high-speed rotors 9, 9 have a plurality of pin-shaped collision members 15, 15 projecting from the outer peripheral surface. The high-speed rotors 9, 9 and the impact members 15, 15 are located inside the stirring member 7 of the low-speed rotor 6. By the high speed drive shafts 16 and 16 which are provided and project outward from the end face 3 side, for example, high speed (100 to 8000 rpm) in the same direction as the low speed rotor 6 (it may be different).
Is rotated by. The high-speed drive shafts 16, 16 are rotatably held by bearings 18, 18 in cylindrical casings 17B, 17B protruding outward from the end face 3 side, and the motor 1 attached to the casings 17B, 17B.
It is rotated at the high-speed rotation speed set by 9 and 19. The motor 19 may be installed on the base 11 to rotate the high speed drive shaft 16.

20 is a container 1 for liquid such as granulation water or binder
The required number of adding means 20 is the adding means for injecting
The stirring member 7 of the low speed rotor 6 and the impact member 1 of the high speed rotor 9
It is provided on the end face 3 side so as not to hinder the rotation of 5. An exhaust port 21 for discharging the shaft seal gas and soot for liquid atomization from the liquid adding means 20 is provided in the upper part of the container 1 in addition to the raw material input port 4, and above the exhaust port 21 is a bag. The filter 22 is attached as needed.

Next, the granulation process in the apparatus will be described with reference to FIGS.

A plurality of pre-measured powdery or granular materials are charged into the container 1 through the material charging port 4 in which the charging valve is opened, and the charging valve is closed (Fig. 5). After the powder material is charged, the low speed rotor 6 and the two high speed rotors 9, 9 are sequentially rotated in the same direction, and dry powder mixing is performed for a predetermined time. During this powder mixing, the powdery granular material that has been subjected to a strong stirring action by the impact members 15, 15 of the high speed rotors 9, 9 is dispersed and mixed, and at the same time, it contains air so that its apparent volume is generally increased. Then, the entire container 1 is spread (FIG. 6).

When this state is reached, a fixed amount of water or a binder liquid is supplied into the container 1 in an atomized state by the two-fluid spray of the liquid adding means 20. The supplied liquid is
By the rotation of the stirring member 7 of the low speed rotor 6 and the impact members 15, 15 of the two high speed rotors 9, 9, they are first mixed with the powdery granular material in a strong turbulent flow / circulation state and uniformly dispersed. As the amount of liquid supplied increases, the apparent volume of the wetted granular material generally decreases and the adhesiveness increases, so that the stirring member 7 of the low-speed rotor 6 causes the wetted granular material to adhere to the inner wall surface of the container 1. It is lifted up along and is supplied to the high speed rotors 9, 9 in a cascaded flow as shown in FIG. 7 or 8. In FIG. 7, the granular material that has fallen to the high speed rotor 9 on the right side is not only subjected to the compression / shear action by the impact member 15 of the high speed rotor 9, but also
It is blown to the other high-speed rotor 9 provided in the vicinity, and is also subjected to the compression / shear action (FIG. 7).

In the state in which the liquid amount is supplied from the liquid adding means 20 and the operation is performed, the high-speed rotors 9 and 9 cause the secondary agglomeration of the dry powder raw material due to the strong compression / shearing action given to the powder raw material. In addition to crushing, it improves dispersion with the supplied liquid,
Further, the liquid cross-linking by the liquid supplied to the granular material is promoted to efficiently produce a granulated product having a uniform particle size (Fig. 8). In this case, the granular material in the container 1 is
Since the whole of the two high speed rotors 9 and 9 is uniformly subjected to a strong compression / shearing action, compared to the case of FIG. 23 in which the high speed rotor d moves within one conventional device, It is possible to eliminate the flow of the arrows A and B that circulate without being affected by the impact member e of the high-speed rotor d so that various performances of the granulator do not deteriorate even when scaled up.

When a predetermined granulation time has elapsed, the high speed rotor 9 and the low speed rotor 6 stop rotating in this order, the discharge lid is opened, and both rotors 6 and 9 are rotated again to discharge the granulated product from the discharge port 5.

In the operation of the granulator, generally, the larger the ratio of the supply liquid to the raw material and the lower the rotation number of the high speed rotor 9, the larger the particle size of the granulated product, and the longer the granulation time, the higher the speed of the high speed rotor 9 is. The higher the number of revolutions, the higher the bulk density. Therefore, by changing the combination of these granulation conditions, it is possible to control granulated product characteristics such as particle size and bulk density.

FIG. 9 is a graph showing a comparison of particle size distribution of granulated products between the granulator according to the present invention having two high-speed rotors and the conventional granulator having one high-speed rotor. The horizontal axis of the graph shows the particle size (μm), and the vertical axis shows the cumulative weight on the screen.

In Fig. 9, is a small granulator with one high-speed rotor, is a conventional large-sized granulator with one high-speed rotor that is a scale-up of the small granulator with a volume ratio of 18 times, and The large-sized granulator according to the present invention, which is obtained by scaling up the small-sized granulator described in (1) above with the same volume ratio, has the same effective capacity as the large-sized granulator described in (1).

Talc having an average particle size of several μm was used as a raw material for the granulation test, and an aqueous solution of PVA (polyvinyl alcohol) was used as a binder.

According to this graph, in the case of a conventional large-scale granulator that scales up the small-scale granulator, the distribution curve of the particle size becomes more horizontal and the sharpness is lost. In the case of the large granulator of the present invention, which shows a good agreement with the particle size distribution of the small granulator over the entire granulated particle size, it is possible to prevent performance degradation of the large granulator when scaled up. Is shown.

Although the case where two high speed rotors 9 are provided has been described in the above embodiment, the high speed rotor 9 may be, for example, the tenth rotor.
Three pieces may be provided in the arrangement shown in the figure, or four pieces may be provided in the arrangement shown in FIG. The number of high-speed rotors 9 is not limited to four, and they can rotate in different directions.

In the above embodiment, the liquid adding means 20 is attached to the drive-side end face 3 of the high speed rotor 9 and sprays obliquely downward from above the high speed rotor 9, but the liquid adding means 20 is
It may be attached at another position where it does not contact the low speed rotor 6 and the high speed rotor 9. Further, when the volume of the container 1 becomes large and the reaching distance of the liquid supplied from the liquid adding means 20 becomes insufficient, as shown by the solid line in FIG. A through hole 21 is provided in the center, and a spray nozzle serving as a liquid adding means 20 is fixed in the through hole 21 to supply the liquid from the inner end surface of the container of the low-speed rotor 6, or as shown by the chain double-dashed line in FIG. At the end face 3 side of the container 1 to which the high speed rotor 9 is attached, the liquid adding means 20 is attached in a state of protruding into the container 1, and the liquid adding means 20
Alternatively, the water or the binder may be supplied in the form of a two-fluid spray or a drop.

The stirring member 7 attached to the low-speed rotor 6 lifts the entire raw material supplied into the container 1 while stirring the raw material in the circumferential direction, and supplies the raw material to the high-speed rotor 9 in the axial direction with respect to the stirring member 7. When a twist is applied, not only the stirring in the circumferential direction but also the stirring in the axial direction can be added by the rotation of the stirring member 7 to improve the mixing effect of the raw materials and the dispersion effect of the supplied liquid. Moreover, when it is desired to effectively remove the wet raw material adhering to the inner peripheral wall of the container 1, the stirring member 7 of the low-speed rotor 6 is provided with the scraper 22 which is extremely close to the inner peripheral wall of the container. It may be attached so as to be adjustable in the radial direction as shown in. In this case, the scraper 22 may be attached to at least one of the plurality of stirring members 7 attached to the low speed rotor 6.

Further, in the above-mentioned embodiment, it is preferable that the plurality of stirring members 7 each having one end attached to the low-speed rotor 6 are fixed at their divided base end portions with bolts 23 or the like (FIG. 12). FIG. 15 shows another example of the stirring member 7, which is a case where the tips of the L-shaped blades (the driving side of the high speed rotor 9) are connected by a rig 24 to form an integral type.

Further, the large number of impact members 15 attached to the outer peripheral surface of the high-speed rotor 9 are not limited to the pin-shaped members, but as shown in FIG. A combination of blades, as shown in FIGS. 17 and 18, when blades having a length shorter than the length of the high-speed rotor 9 are arranged linearly or spirally, and FIG. As shown in the figure, the blade may be twisted. Needless to say, a pin-shaped impact member may be added to the blade of the impact member 15 shown in FIGS. 17 to 19.

〔The invention's effect〕

Since the present invention is configured as described above, it has the following effects.

(1) In the granulator according to claim 1, the granular material which is lifted upward in the container by the stirring member of the low speed rotor is supplied to two high speed rotors provided inside the stirring member, A large number of impact members mounted on the outer peripheral surface of each high-speed rotor undergo a strong compression / shear action. Moreover, strong compression /
The granular material that has undergone the bending action is blown from the first high-speed rotor toward the second high-speed rotor, and the second high-speed rotor is again subjected to the strong compression / shear action.

For this reason, when the granulator is scaled up from a small machine to a large machine, the mixing time increase and the lack of sharpness in the particle size distribution, which have been problems in the conventional apparatus having one high-speed rotor, are improved, It is possible to provide an excellent large-sized granulator having a sharp particle size distribution, in which mixing and dispersion are uniformly carried out in a short time with almost no deterioration in excellent granulation performance in a small-sized machine.

In addition, since the liquid adding means is provided so as to penetrate through the end face side of the container on the side where the high speed rotor is attached, or the axial center of the low speed rotor, the liquid supply from the liquid adding means is agitated. The operation can be performed without being hindered by the low-speed rotor including the member and the high-speed rotor including the impact member.

(2) In the granulator according to claim 2, since the high-speed rotor provided inside the stirring member is a plurality of three or more, the scale-up is achieved by the synergistic effect of the strong compression / shear action received in each high-speed rotor. It is possible to further improve the granulation performance of the large-sized granulator.

(3) In the granulator according to claim 3, since the liquid adding means for supplying water or the binder is provided so as to project inward from the end surface side of the container, the water or the binder is used as the powdery or granular material in the container. It will be easier to uniformly supply.

(4) In the granulator according to claim 4, 2 is used as the liquid adding means.
Since a plurality of fluid sprays are provided, it is possible to improve the dispersion of the liquid to be supplied and the granular material, and to shorten the liquid supply time.

(5) In the granulator according to claim 5, since the impact member of the high-speed rotor is a pin, a blade that is straight in the axial direction, a blade that is inclined with respect to the axial direction, or a combination thereof, processing is performed. It is possible to adjust the magnitude of the compression / shearing action given to the granular material by the high-speed rotor and the flow of the granular material in the container according to the characteristics of the granular material to be powdered.

(6) In the granulator according to claims 6, 7, and 8, the stirring member of the high-speed rotor is a blade, and the blade is not connected on the end face side holding the high-speed rotor, or is connected by a ring. , Straight in the axial direction of the low-speed rotor,
Alternatively, since it is twisted, the strength of the stirring member and the flow in the axial direction can be applied to the granular material in the container.

(7) In the granulator according to claim 9, since the scraper is attached to the stirring member of the low speed rotor, the wet raw material adhering to the inner wall surface of the container can be effectively removed.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of an embodiment of the present invention, FIG. 2 is a sectional view showing an arrangement state of a low speed rotor and a high speed rotor, FIG. 3 is a front view of the entire apparatus, and FIG. Left side view, fifth
Figures 8 to 9 are sectional views schematically showing the granulation process in the apparatus, Figure 9 is a particle size distribution curve showing the scale-up effect of the apparatus of the present invention, and Figures 10 and 11 are the number of high-speed rotors. 12 is a sectional view of another embodiment of the stirring member, FIG. 12 is a plan view of another embodiment of the stirring member, FIG. 13 is a perspective view showing still another embodiment of the stirring member, and FIG. 14 is FIG. FIG. 15 is an enlarged view of a main part of FIG. 15, FIG. 15 is a perspective view of still another embodiment of the stirring member, and FIGS. 16 to 19 are perspective views of other embodiments of the impact member attached to the high-speed rotor. FIG. 20 is a longitudinal sectional view of another embodiment in which the constitution of the adding means is different, FIGS. 21 and 22 are sectional side views of different conventional examples, and FIG. 23 is the apparatus having the constitution of FIG. It is sectional drawing which showed typically the flow of the granular material at this time. 1 ... Cylindrical container, 2, 3 ... End face of container 4 ... Raw material input port, 5 ... Discharge port 6 ... Low-speed rotor, 7 ... Stirring member 8 ... Drive shaft of low-speed rotor 9 ... High-speed rotor, 15 ... Impacting member, 20 ... Adding means, 22 ... Scraper

Claims (9)

[Claims] 1. A cylindrical container provided with a raw material inlet and a discharge port is arranged horizontally or diagonally horizontally, and a low speed rotor provided with a stirring member close to the inner peripheral surface of the container is Two high-speed rotors, which are provided through the center of one of the end faces and are equipped with numerous impact members on the outer peripheral surface,
The adding means for supplying water or binder, which is provided through the other end face side of the container so as to be located inside the stirring member of the low speed rotor, is the end face side of the container on the side to which the high speed rotor is attached, or the low speed rotor. A granulator characterized by being provided so as to penetrate through the central part of the shaft. 2. A cylindrical container having a raw material inlet and a discharge port is arranged horizontally or diagonally sideways, and a low speed rotor provided with a stirring member close to the inner peripheral surface of the container is Three or more high-speed rotors, which are provided through the central part of one end face and have a large number of impact members on the outer peripheral surface, are provided through the other end face side of the container so as to be located inside the stirring member of the low-speed rotor, The granulating machine characterized in that the liquid adding means for supplying water or the binder is provided so as to penetrate through the end face side of the container on the side where the high speed rotor is mounted or through the axial center of the low speed rotor. 3. A cylindrical container having a raw material inlet and a discharge port is arranged horizontally or diagonally sideways, and a low speed rotor equipped with a stirring member close to the inner peripheral surface of the container is A plurality of high-speed rotors, which are provided through the central part of one end face and are provided with a number of impact members on the outer peripheral surface, are provided through the other end face side of the container so as to be located inside the stirring member of the low-speed rotor. Alternatively, the granulating machine is characterized in that the liquid adding means for supplying the binder is provided so as to project inward from the end face side of the container on the side to which the high speed rotor is attached. 4. The granulating machine according to any one of claims 1 to 3, wherein the liquid adding means is provided with a plurality of two-fluid sprays. 5. The impact member comprises a pin, a blade which is straight in the axial direction of the high speed rotor, a blade which is inclined with respect to the axial direction, or a combination thereof. The granulator according to any one of 1. 6. The granulating machine according to any one of claims 1 to 5, wherein the stirring member is a plurality of blades, and the end face side of the container holding the high-speed rotor is not connected. . 7. The structure according to claim 1, wherein the stirring member is a plurality of blades, and the end face side of the container holding the high-speed rotor is connected by a ring. Granulator. 8. The granulator according to claim 6 or 7, wherein the blade of the stirring member is straight or twisted in the axial direction of the low speed rotor. 9. The low speed rotor according to claim 1, wherein a scraper which is in close proximity to the inner peripheral wall of the container is attached to at least one of the stirring members. Granulator.