Powder pelletizing and pelletizer to this end

FIELD: process engineering.

SUBSTANCE: invention relates to powder pelletizing. Multiple scrapers are arranged to abut on or to approach to cylindrical container bottom inner side, container keeping the powder to be pelletized are spinning of container bottom surface in horizontal plane.

EFFECT: higher efficiency and yield, ruled out sticking to container inner wall.

12 cl, 8 dwg, 2 tbl

 

AREA of TECHNOLOGY

The present invention relates to a method of granulation of powder and apparatus for granulation. More specifically, the present invention relates to a method granulation container rotary type and apparatus for granulation.

The LEVEL of TECHNOLOGY

There are many kinds of ways granulation of the powder, for example, drum granulation, methods of agitation granulation, extrusion methods are granulation, compression methods are granulation, ways granulation in a fluidized bed, ways granulation crushing and the like.

Among the above, the method of agitation granulation is a method in which a target granulated particles obtained by the transmission of shear, kneading and sealing effects on the source material powder, by adding liquid or binder to raw material powder and bring the stirring blades of different shapes in rotation. For example, a similar method of agitation granulation is disclosed in Publication No. S61-5946 passed the examination of Japanese utility model applications (Japanese Examined Utility Model Application Publication No. S61-5946).

In this method, agitation granulation raw materials powders can be accurately mixed for a short time, and can be obtained relatively large product (Gran�graded particles) with a relatively uniform particle size for even in the case of many types of source material powder. Accordingly, the method of agitation granulation is used for granulation of different types of raw materials powders, such as drugs, foods, pesticides, feed, fertilizer, mineral substances, and the like.

However, mixing in the agitation granulator type disclosed in Publication No. S61-5946 passed the examination of Japanese utility model applications (Japanese Examined Utility Model Application Publication No. S61-5946), the impact of strong forces of compression and shear forces on the powder is the result of rotation of the stirring blades that rotate at high speed, and, in addition, granulation is carried out by means of the force of adhesion of the binder, such as water, adding binder to the powder. Accordingly, there is strict adhesion (fixing) between the inner side of the container and mixing blades.

In addition, the wetted powder is pressed against surfaces of the container walls due to the centrifugal force, which is transmitted from the stirring blades, and therefore the powder also sticks to these surfaces. This adhesion was noted, in particular, in cases of granulation, which used the powder with a large specific gravity or small size particles.

As a result, the operation of removing the adhesive layer must be performed during the operation; alternate�but the operation of removing the adhesive layer must be performed after discharge of the product (before loading the next source material). This was problematic because of the associated lower work efficiency and productivity, and in this way has proved problematic due to the associated lower degree of extraction of the product and the variability of particle size of the product.

Disclosure of the INVENTION

In light of the above information from the prior art, the object of the present invention is to provide a method for the granulation of powder and apparatus for granulation, which provide higher efficiency and productivity and increase the degree of extraction of the product by eliminating adhesion of powder to the inner wall of the container, and where the variability of particle size of the product is eliminated.

To achieve the above objectives the first method granulation powder of the present invention includes: set of many of the scrapers so that they are adjoined or approached close to the inner side having a bottomed cylindrical container that accommodates powder; and granulating the powder in the container by bringing the inner bottom surface of the container in rotation in a horizontal plane.

Used in Yes�nom document, the term "close to" refers to the maximum possible closeness, but without the full adjacency.

The second method granulation powder of the present invention is the first invention in which the granulated powder in the container by bringing the inner bottom surface of the container in rotation in a horizontal plane in a state where scrapers are fixed.

The third method granulation powder of the present invention is the first invention in which the powder in the container is granulated by bringing the inner bottom surface of the container in rotation in a horizontal plane, while the scrapers are driven along the inner side of the container.

In the first through third methods of granulation powder of the present invention containing the powder container is rotated for granulation of powder, and therefore the adhesion of the powder to the inside of the container is reduced. Respectively, can be reduced the number of operations of removing the adhesive layer, the withdrawals, during the process or operation of removing the adhesive layer after unloading the product (before the next load source of the material); increase efficiency and productivity, increases the degree of extraction of the product, and the particle size of the product is more uniform.

As used m�ojesto scrapers, thereby reducing the load from the bed of powder, acting on each scraper, and therefore can be extended life scrapers. The increase in the number of pigs increases the degree of mixing of the powder and increased turbulence. Accordingly, enhanced granulation effect.

The fourth method granulation powder of the present invention is any from the first to the third invention, in which the container is driven in rotation with the outer linear velocity ranging from 1 to 5 m/s.

In the method of granulation of the powder in accordance with the fourth invention, the container is rotated at a low speed, and therefore the load on the device can be reduced and the service life of the device is increased.

To achieve the above objectives, the fifth device for the granulation of the powder of the present invention has a configuration, wherein the plurality of scrapers positioned so as to abut or approach close to the inner bottom surface of the cylindrical container so that the inner bottom surface rotated in a horizontal plane, and thus to join or approach close to the inner side which is adjacent to the inner bottom surface.

In the apparatus for granulation of powder for the fifth invented�Yu containing powder container is rotated for granulation of powder. Thus, this prevents the growth of adhered product, and even when the powder sticks to the inner surface, this allows you to quickly scrape adhered product. As a result, the degree of extraction of granular particles can be increased, and the variability of particle size of the product (granular particles) can be removed.

Scrapers are arranged in the form of their sets, and therefore acting on each scraper load from the bed of powder is reduced and the service life of scraper can be increased. The increase in the number of pigs increases the degree of mixing of the powder and increased turbulence. Accordingly, enhanced granulation effect.

A sixth device for the granulation of the powder of the present invention is the fifth invention, in which the scrapers are arranged separately so as to abut or approach close to the inner bottom surface and inner side surface, which contacts loaded into a cylindrical powder container.

In the device for the granulation of a powder in accordance with the sixth invention scrapers reliably come into contact with the powder, which is loaded into a cylindrical container. Therefore, all the powder feels granulation effect, and the degree of extraction of the product is great� increases.

The seventh device for the granulation of the powder of the present invention is the fifth invention, in which the scrapers are arranged separately so as to abut or approach close to the inner bottom surface, an inner side surface and the angle between the two cylindrical surfaces of the container.

In the device for the granulation of a powder in accordance with the seventh invention, the scrapers are attached to the inner bottom surface, an inner side surface and the angle between both surfaces of the cylindrical container. Thus, the powder in the corner can be reliably scraped off and granulated.

The eighth device for the granulation of the powder of the present invention is the fifth invention, in which the scrapers, which are arranged so as to abut or approach close to the inner bottom surface of the cylindrical container, are separated for internal periphery and the external periphery of the container.

In the device for the granulation of a powder in accordance with the eighth invention is a scraper for the inner periphery of the lead powder, which is present in the Central part of the cylindrical container (including powder, which is returned to the inner peripheral part of the other scrapers), to the movement by actively seeks�Yu to the outer peripheral part of the high linear velocity (higher granulating effect), and the external peripheral part forms a layer of powder. The result can be increased granulation effect.

The ninth device for the granulation of the powder of the present invention is an eighth invention, in which in the Central part of the cylindrical container instead of a scraper for the inner periphery of the formed conical or essentially hemispherical portion of the liner.

In the device for the granulation of a powder in accordance with the ninth invention, the powder that is present in the Central part of the cylindrical container (including powder, which is returned in the internal peripheral portion of scrapers) can be set in motion more toward the outer peripheral portion of the cylindrical container, which creates a granulation effect without the scraper, located in the Central part of the cylindrical container. As a result, the number of scrapers may be reduced and the device can be simplified.

The tenth device for the granulation of the powder of the present invention is any from the fifth to the ninth invention, in which scrapers are located in the position in which the front end thereof is inclined so as to be facing in the direction of rotation of the cylindrical container.

In the apparatus for granulation powder�ka in accordance with the tenth invention the front ends of the scrapers are not zakladivaetsa with the inner surface of the cylindrical container, even when the first join last. Thus, this prevents damage to both the pig and propulsion.

Powder in a cylindrical container is sealed on the inner side scrapers and between the two parties formed a compacted layer of the starting material powder. However, the constant driving force is applied to the scrapers, is converted into shear force acting on the adhesive layer, and therefore, any adhesive powder layer that will be formed on the inner surface of the cylindrical container, is forced to peel off under the action of the aforementioned shear forces. The result can be increased granulation effect.

Eleventh device for the granulation of the powder of the present invention is any from the fifth to the tenth invention, in which the scrapers are attached to the machine frame or similar device for the granulation by means of rods.

In the device for the granulation of a powder in accordance with the eleventh invention, the position and angular orientation of the scrapers can be easily changed by deformation of the rods.

Twelfth device for the granulation of the powder of the present invention is any from the fifth to the eleventh invention, in which scrapers are adjacent to notransaction cylindrical container under the action of the driving force of springs, or scrapers forced to depart from the inner side of the cylindrical container when the preset load or large scrapers attached to.

In the device for the granulation of a powder in accordance with the twelfth invention scrapers forced to depart from the inner side of the cylindrical container under the action of the driving force of springs, even when the preset load or a large impact on scrapers, for example, granular particles that are stuck between the scrapers and the inner side of the cylindrical container. This allows to reduce the degree of wear and damage scrapers.

Thirteenth the device for the granulation of the powder of the present invention is any from the fifth to the twelfth invention, in which scrapers are located at an equal distance in the circumferential direction of the cylindrical container.

In the device for the granulation of a powder in accordance with the thirteenth invention, the number of pigs can be increased. As a result, the probability of the powder to come into contact with scrapers per unit time, i.e. the degree of mixing of the powder scrapers, can be increased, and the time of granulation can be reduced.

To achieve the above objectives, the fourteenth device for granulation of powder really from�bretania has a configuration, wherein the plurality of scrapers positioned on the frame of the machine or the like movably in a radial direction with respect to the inner bottom surface, which rotates in a horizontal plane and in a vertical direction with respect to the inner side surface which smoothly mates with the inner bottom surface of the cylindrical container, so that the front ends of a plurality of scrapers are adjacent or approaching close to the inner bottom surface and inner side surface of the cylindrical container.

In the device for the granulation of a powder in accordance with the fourteenth invention scrapers are driven, and thus the surface area of contact between the scrapers and the powder can be reduced. This can be reduced by the load acting on the scrapers, and the service life of the device may be increased.

Fifteenth device for the granulation of the powder of the present invention is the fourteenth invention, in which scrapers are located at an equal distance in the circumferential direction of the cylindrical container.

In the device for the granulation of a powder in accordance with the fifteenth invention, the number of pigs can be increased. As a result, the probability of the powder to come into contact with scrapers per unit time, i.e. �degree of mixing of the powder scrapers, can be increased, and the time of granulation can be reduced.

BRIEF description of the DRAWINGS

Fig. 1 is a drawing of a top view principally illustrating a variant of the device for the granulation for carrying out the method of granulation of the powder in accordance with the present invention;

Fig. 2 is a schematic sectional drawing of part of Fig. 1 along the line II-II;

Fig. 3 is a schematic sectional drawing of part of Fig. 1 along the line III-III;

Fig. 4 is a schematic sectional drawing of part of Fig. 2 along the line IV-IV;

Fig. 5 is a schematic sectional drawing illustrating the angular orientation of the scraper in accordance with the present invention relative to an adjacent surface and illustrating the flow of powder;

Fig. 6 is a schematic sectional drawing illustrating a modification of the container in the device for the granulation of a powder in accordance with the present invention;

FIS. 7 is a set of drawings, principally illustrating another variant of the device for the granulation for carrying out the method of granulation of the powder in accordance with the present invention, where Fig. 7(A) is a drawing of the top view, and Fig. 7(B) is a drawing of a longitudinal section.

BEST mode of carrying out the INVENTION

Method of granulation of powder and apparatus for granulation in accordance with the present invention are described in detail below on the basis of the options with reference to the accompanying drawings.

The device 10 for granulation of powder in accordance with the present invention, shown in Fig. 1-4, includes: a cylindrical container 11, the bottom of which rotates in a horizontal plane; drive means 12, which result in rotation of the cylindrical container 11 through the shaft 12A which is mounted on the Central axis of rotation of the cylindrical container 11; and a variety of scrapers 13, 14, 15, which are arranged in such a manner as to come into contact with the inner bottom surface 11a of the cylindrical container 11 and the inner lateral face 11b, which is smoothly contiguous to the peripheral edge above the inner bottom surface.

Here, the inner bottom surface 11a of the cylindrical container 11 is a circular flat plate, and the inner side wall 11b which is adjacent thereto, is formed so as to be perpendicular to the inner bottom surface 11a. The reduced diameter section having a diameter, tapered upwards, may be provided in the upper part of the inner lateral face 11b. The upper part of the cylindrical container 11 may be inopen condition, as shown in the figure. Alternatively, following a closed structure can be obtained when the cover is mounted to the frame of the machine.

Device for pellet 10 has a configuration in which the scrapers 13 are composed of two scrapers 13A, 13b, which are ribbon-like plate in the form of arcs. Scrapers 13A, 13b are provided extending in the radial direction of the inner bottom surface 11a of the cylindrical container 11 so that the intermediate section (projecting section) in the longitudinal direction acts in the direction opposite to the direction of rotation of the cylindrical container 11.

In scraper disc 13b, located on the outer peripheral side, in particular, the end portion of the scraper 13b, which is located on the outer peripheral side, is preferably positioned so as to be inclined in the direction of the future direction of rotation of the cylindrical container 11, in the so-called swept the state, rather than the end portion, which is provided on the Central part of the cylindrical container 11. The reason for this is that this configuration gives a higher granulation effect.

Two scrapers 13A, 13b are arranged so that the scrapers 13A, 13b for rotation of the inner bottom surface 11a of the cylindrical container 11.

You�OTA scrapers 13A, 13b is less than the height of the layer of powder, at a time when the starting material powder was charged into a cylindrical container 11, and varies depending on the size and height of the layer of powder. The height of the scrapers 13A, 13b is set, for example, up to about 10 mm, in the case where the device has an internal volume of 65 liters.

Scrapers 13A, 13b are mounted to respective lower ends of the rods 17A, 17b. The rods 17A, 17b extending upward so that the upper end parts of the rods 17A, 17b are bent at right angles relative to the scrapers 13A, 13b in the direction opposite to the direction of rotation of the cylindrical container 11. The upper ends of the rods 17A, 17b are pivotally rely on their respective shafts 20A, 20b, which are fixed in the horizontal direction, in the upper part of the racks 19a, 19b, which are arranged on the frame 18 of the machine. One corresponding end of each of the cords 21A, 21b connected to the corresponding upper end of each rod 17A, 17b, and the other ends of the cords 21A, 21b, placed on top of the springs 22A, 22b, which are arranged between the cords 21A, 21b and the frame 18 of the machine. Accordingly, the scrapers 13A, 13b are brought into contact (abut) with the inner bottom surface 11a of the cylindrical container 11 under the action of the driving force of the springs 22A, 22b.

Method of bringing into contact of the scrapers 13A, 13b with the inner lower surface 11� cylindrical container 11 is not limited to the driving force of springs 22A, 22b. Can be selected the appropriate way, which includes, for example, controls air pressure by means of pneumatic cylinders, control torque of the electric motor, or based on a specified load weight.

Scraper 14 is made in the form of a narrow elongated plate or an elongated solid cylindrical body. Part of the front end of the scraper 14 has a rounded curvature comparable to the angle 11c between the inner lateral face 11b and the inner bottom surface 11a of the cylindrical container 11, as shown in Fig. 4. Part of the front end of the scraper 14 is inclined with an inclination from above, i.e. in the direction of rotation and the outer peripheral direction of the cylindrical container 11 in such a manner as to be adjacent to the corner 11C.

Scraper 14 is attached to the lower end of the rod 23. The rod 23 is extending up so that the upper end portion of the rod 23 is bent at right angles with respect to the scraper 14 in the direction opposite to the direction of rotation of the cylindrical container 11. The upper end of the rod 23 is pivotally rests on the shaft 20A that is attached to the rack 19a, which is located on the frame 18 of the machine. One end of the extension tube 26 is connected with the upper end of the rod 23 and the other placed on top of the spring 27, which is located between the extension 26 and the frame 18 of the machine. Thus, the scraper 14 PR�meget to the corner 11C of the cylindrical container 11 under the action of the driving force of the spring 27.

The scraper 15 is formed of ribbon-like plate. The scraper 15 is facing in the longitudinal direction in such a way as to adjoin the inner side surface 11b of the cylindrical container 11.

The scraper 15 is attached to the lower end of the rod 29 of the coupler 28. The rod 29 is extending up parallel to the scraper 15. The upper end of the rod 29 is pivotally supported by a bearing 32, which is attached by fasteners 31 to the rack 30, which is located on the frame 18 of the machine. One end of the extension tube 33 connected to the upper end of the rod 29 and the other end is held in a horizontal direction by a spring 35, which is mounted between the extension 33 and section 34 of the reception of the spring, which is mounted on the frame 18 of the machine. Thus, the scraper 15 is brought into contact with the inner lateral face 11b of the cylindrical container 11 under the action of the driving force of the spring 35.

Alternative ways of bringing into contact of the scraper 14 with the corner 11C of the cylindrical container 11 and alternative ways of bringing into contact of the scraper 15 with the inner lateral face 11b of the cylindrical container 11 is identical to the means of bringing into contact of the scrapers 13A, 13b with the inner bottom surface 11a of the cylindrical container 11.

In the location configuration scrapers And (13A, 13b, 15), which is used in the embodiment, as shown in Fig. 5, p�redni end "a" is preferably relative to an adjacent surface B (the inner bottom surface 11a and the inner side 11b) of the cylindrical container 11 thus, what front end "a" is inclined towards the direction of an adjacent surface B (in the direction of the direction of rotation of the cylindrical container 11). As a result, the front end "and" scrapers jams And not adjacent surface, even when the front end "and" scrapers And is adjacent to an adjacent surface B. Thus, this prevents damage to both the pig and propulsion.

Next will be explained a method of granulation of the powder from the device 10 for granulation of powder in accordance with the present invention.

Predetermined amount of the starting material powder was charged into a cylindrical container 11 of the device 10 for granulation, performed as described above, and the cylindrical container 11 is rotated by the above-described means of the actuator 12 (e.g., engine). In this case, the speed of rotation of the cylindrical container 11 is arbitrary, but is typically installed with the external line rate from 1 to 5 m/s. This is a very slow speed compared to the external line rate of 10 to 15 m/s in the above-described conventional mixing agitation granulator type. As a result, the loading device 10 for granulation in accordance with the present invention can be reduced and the service life of the device may be increased.

Centrifugal force, to�which occurs in response to the rotation of the cylindrical container 11, effects the powder, which is loaded into a cylindrical container 11, and the powder is propelled to the part of the peripheral edge of the cylindrical container 11. At the same time, the closer the powder is to the cylinder inner bottom surface 11a of the cylindrical container 11, the smaller the centrifugal force that acts on the powder, and thus, the powder remains in place; however, the powder is forcibly moved along the band-like plate scraper 13A in the area of granulation C toroidal shape on an outer side of the two-point dot-dashed line.

Means for bringing the powder in the vicinity of the center of the cylindrical container 11 to the active movement in the field of granulation are not limited To the above-mentioned scraper 13A, and a conical or essentially hemispherical resistant portion 36 may be formed in the Central portion of the cylindrical container 11, as shown in Fig. 6.

The powder, which is moving towards the field of granulation, varies with the centrifugal force which acts on the powder, and depending on the characteristics of the powder. Powder ascends along the inner side surface 11b of the cylindrical container 11 and remains there, forming a layer of powder, the height of accumulation of which increases toward the peripheral part�tion region. A layer of powder moves rotationally together with the cylindrical container 11. However, scrapers 13b, 15, 14 are arranged so as to adjoin the outer peripheral portions of the inner bottom surface 11a and the inner side surface 11b and 11C between the two surfaces of the cylindrical container 11. Thus, the powder in the cylindrical container 11 is necessarily in contact with any of the blades 13b, 15, 14 once in each rotation of the cylindrical container 11. These effects influence the powder when the latter comes into contact with a scraper 13b, 15, 14.

First, the scraper 13b causes the pressing portion of the powder, which is present in the field of granulation on the inner bottom surface 11a of the cylindrical container 11, to the inner bottom surface 11a of the cylindrical container 11, but most of the powder rises over the place in the direction of the scraper 13b and thereby causes the transfer in the outer peripheral direction with nascrebet to fall on the powder layer on the outer peripheral part. Scraper 14 causes the return of the powder, which is present in the corner 11c of the cylindrical container 11, in the direction of the center of the cylindrical container 11, and the rest of the powder is twisted upward along the inner lateral side 11 and falls on the powder layer on the outer preferencesi when performing so-called movement in the form of a twisted rope. Scraper 15 causes the pressing portion of the powder, which is present in the vicinity of the inner side 11b of the cylindrical container 11, to the inner side surface 11b of the cylindrical container 11, but most of the powder scraped off from the inner side 11b, rises above the scraper plate 15, twists up thereby in the direction of the center of the cylindrical container 11 and falls, being widely scattered over a layer of powder in the field of granulation With the implementation of the movement in the form of a twisted rope.

Powder in a cylindrical container 11 is vigorously stirred and mixed with the combined effect reported scrapers 13b, 14, 15, shear, torsion, and seal, identical to that of the stirring blades of the mixing agitation granulator type at a time for each rotation of the cylindrical container 11.

Powder that is returned in the direction of the center (inside the two-point dot-dashed line) of the cylindrical container 11 scrapers, in turn, is moved forcibly in the region of granulation With a scraper 13A and undergoing the combined effects of the above.

Further, a binder such as water or the like, is sprayed at a predetermined feed speed, for example, through one nozzle (not shown) with�Oh powder in the field of granulation C. In this regard, the binder adheres to the surface of powder particles, which are shuffled and mixed, and formed loose aggregates of primary due to the intermittent liquid bridge around the contact points between particles. These units are then gradually condensed, and the resulting voids between the particles become smaller; further, the powder sticks together and communicates with the periphery of the unit, or alternatively, the aggregates stick together and communicate with each other, and gradually grow larger particles.

Thus, units that contain a binder, pressed to the inner side of the cylindrical container 11 scrapers A, and is formed in the adhesive layer of the starting material powder (aggregates) between the front end "and" scrapers A and the adjacent surface B of the cylindrical container 11. However, the constant driving force applied to scrapers And is converted into shear force acting on the adhesive layer, and therefore, any adhesive powder layer that will be formed on the inner side of the cylindrical container 11, is forced to flaking immediately through the above-mentioned shear forces.

Granular particles and the like, which is great, strive to be compressed between the front end "and" scrapers A and the adjacent surface of the cylindrical container 11. In Reza�the adds, scrapers 13A, 13b, 14, 15 extend from the inner sides 11a, 11b, 11C in the direction of the point-to-point dot-dashed line, as shown in Fig. 2 and Fig. 3, against the driving force of the respective springs 22A, 22b, 27, 35, even if the load is equal to or greater than the preset load, affects scrapers A. Therefore, the service life and damage to the scrapers 13A, 13b, 14, 15 are reduced.

After the termination of the binder of the cylindrical container 11 continues to rotate for a predetermined time; when granular particles reach the desired size of the particles, the rotation of the cylindrical container 11 is stopped and the granulation process ends.

Fig. 7 is a drawing principally illustrating another variant of the device for the granulation for carrying out the method of granulation of the powder in accordance with the present invention.

The device 40 for granulation of powder in accordance with the present invention comprises: a cylindrical container 41, the bottom of which rotates in a horizontal plane; drive means 42, which lead cylindrical container 41 into rotation by a shaft 42A which is mounted on the Central axis of rotation of the cylindrical container 41; a plurality of scrapers 43, 44, which are arranged in such a manner as to come into contact with the inner bottom surface�Yu 41A above the cylindrical container 41 and the inner lateral side 41b, which smoothly adjoins the peripheral edge above the inner bottom surface; and moving mechanisms 45, 46 to move the scrapers 43, 44.

The device 40 for granulation of the powder is identical to the device 10 for the granulation of the powder to the above version in that the inner bottom surface 41A of the above cylindrical container 41 is a circular flat plate, such that the inner lateral side 41b, which is adjacent, is essentially perpendicular to the inner bottom surface 41A; section of smaller diameter having a diameter tapered upwards, can be in the top of the inner lateral side 41b; the upper part above the cylindrical container 41 may be in the open state, as shown in the figure; and the following closed structure can be obtained when the lid is attached to the frame of the machine.

In the device 40 for granulation scraper 43 is made in the form of a narrow elongated plate or rod. The front end (lower end) of the scraper 43 is in contact with the inner bottom surface 41A of the cylindrical container 41. The upper end of the scraper 43 is connected to the rod 45A. Nut 45b is located on the upper end of the shaft 45A so that the screw rod 45c, located in the horizontal direction, is screwed on the nut 45b. Drive shaft �engine 45d, which is located on the machine frame or the like, is connected to the end portion of the screw rod 45c.

In scraper disc 43 when the screw rod 45c rotates in one direction, nut 45b moves in one axial direction of the screw rod 45c, and in response to this, the front end moves in one radial direction of the inner bottom surface 41A of the cylindrical container 41, for example, in the direction of the center. The motor 45d is provided to the reverse rotation when the scraper 43 reaches the center of the inner bottom surface 41A of the cylindrical container 41. In this regard, nut 45b is driven in the other axial direction of the screw rod 45c, and in response to this, the front end of the scraper 43 is moving in a different radial direction of the inner bottom surface 41A of the cylindrical container 41, for example, to the peripheral edge.

The scraper 44 is made in the form of a narrow elongated plate or rod. The front end (outer peripheral end) of the scraper 44 is in contact with the inner lateral side 41b of the cylindrical container 41. The scraper 44 is connected to the extension 46a of rectangular shape in cross section.

A gear rack 46b formed on the side of the extension 46a so that the toothed rack 46b is movably supported on the frame of the machine. Gear 46c is hooked by means of a rack 46b extension 46a so that �esterna 46c is connected to the drive shaft of the motor 46d, which is, for example, the frame of the machine.

In scraper disc 44 when the gear s is rotated in one direction by the motor 46d, extension 46a having a toothed rail 46b formed on it, moves in one axial direction, and in response, the scraper 44 moves in one vertical direction of the inner lateral side 41b of the cylindrical container 41, for example, down. When the scraper 44 reaches the lower end (corner) of the internal lateral side 41b of the cylindrical container 41, the motor 46d is rotated in the reverse direction, causing the gear 46c is rotated in the other direction. In this regard, extension 46a having a toothed rail 46b formed on it, is moving in the other axial direction, and in response, the scraper 44 is moving in a different vertical direction of the inner lateral side 41b of the cylindrical container 41, for example, upwards.

Preferably, the configuration of the location of the scrapers And (43, 44) is such that the front end "a" is located relative to an adjacent surface B (the inner bottom surface and inner side) of the cylindrical container 41 so that the front end "a" is tilted in the direction adjacent the surface of B (in the direction of rotation of the cylindrical container), as in Fig. 5 of the above options. As a result, p�redni the end "and" scrapers jams And not the adjacent surface, even when the front end "and" scrapers And is adjacent to an adjacent surface B. Thus, this prevents damage to both the pig and propulsion.

Next will be explained a method of granulation of the powder from the device 40 for granulation of powder in accordance with the present invention.

Predetermined amount of the starting material powder was charged into a cylindrical container 41 of the device 40 for granulation, performed as described above, and the cylindrical container 41 is rotated by the above-described means of the actuator 42 (e.g., engine). In this case, the speed of rotation of the cylindrical container 41 is arbitrary, but is typically installed with the external line rate from 1 to 5 m/s.

The centrifugal force that occurs in response to the rotation of the cylindrical container 41, acts on the powder, which is loaded into the cylindrical container 41, and the powder moves toward the peripheral edge of the cylindrical container 41. Centrifugal force that acts on the powder, less in the vicinity of the center of the inner bottom surface of the cylindrical container 41, and a layer of powder remains and is formed on the other side. The closer the powder to the inner side surface 41b, the more centrifugal force that acts on the powder, and�Ashok rises along the inner lateral side 41b, and remains on the other side, so that the powder layer is formed on the inner side surface 41b.

Then the engines begin to work 45d, 46d. As a result of rotation of the motor 45d front end of the scraper 43 reciprocating motion at a constant speed in both radial directions (from the centre to the corner 41c) of the inner bottom surface 41A, when coming in contact with the inner bottom surface 41A of the cylindrical container 41. As a result of rotation of the motor 46d front end of the scraper 44 reciprocating motion at a constant speed in a vertical direction (from the corner 41c to the upper side of the layer of powder) inner lateral side 41b, when coming in contact with the inner lateral side 41b of the cylindrical container 41.

In response to the movement of the scraper 43 of the powder on the inner bottom surface 41A of the cylindrical container 41 is pressed against the inner bottom surface 41A of the cylindrical container 41 of the scraper 43, while the other part is forcibly returned in the direction of the center of the cylindrical container 41. The rest of the powder is twisted upward toward the peripheral edge of the cylindrical container 41 and then falls on the powder layer in the circumferential direction of the cylindrical container 41. Scraper 44 presses a portion of the powder n� outer peripheral portion of the cylindrical container 41 to the inner side surface 41b of the cylindrical container 41, and the other part is pressed against the inner bottom surface 41A of the cylindrical container 41, the remaining powder is twisted upwards on the inner side surface 41b of the cylindrical container 41, and falls to powder on the outer peripheral portion of the cylindrical container 41 when performing so-called movement in the form of a twisted rope. Powder in a cylindrical container 41 is vigorously stirred and mixed with the combined effect reported scrapers 43, 44, shear, torsion, and seal, identical to those that are caused by the mixing blades of the mixing agitation granulator type.

Next, a binder such as water or the like, is sprayed at a preset feed speed, for example, through one nozzle (not shown) on the layer of powder in a cylindrical container 41. In this regard, the powder is subjected to the same granulation effect, as described above, and the powder is gradually growing into larger particles. These units, which include a binder, pressed to the inner side of the cylindrical container 41 scrapers A. Adhesion layer of the starting material powder (the aggregates) is formed between the front end "and" scrapers A and the adjacent surface B of the cylindrical container 41. However, the constant driving force applied�traveler to scrapers And, is converted into shear force acting on the adhesive layer, and therefore, any adhesive powder layer that will be formed on the inner side of the cylindrical container 41, is forced directly to the peeling of above shear force.

Scrapers And moving all the time in both radial directions and in the vertical direction of the inner side of the cylindrical container 41. Thus, there is a low probability of jamming of granular particles or similar, that has grown to a large size, between the front end "and" scrapers A and the adjacent surface of the cylindrical container 41, even in the case where scrapers And are elastic, and therefore, the front end "and" moving away from an adjacent surface V. Consequently, reduced service life and damage to the scrapers 43, 44.

After the termination of the binder of the cylindrical container 41 continues to rotate for a predetermined time and continuing reciprocation of the scrapers 43, 44. When granular particles reach the desired size, rotation of the cylindrical container 41 and a reciprocating movement of the scrapers 43, 44 stops, and the granulation process ends.

Above-described variants of the method of granulation of powder and apparatus for granulation according to the present invention, but the present invention is not limited to any embodiments described above and may include, as a matter of course that various variations and modifications that fall within the scope of technical ideas of the present invention set forth in the attached claims.

Examples

The following are examples of the present invention and comparative examples.

1. The DUT

and. The device according to the present invention

The device was made by placing four scrapers in a cylindrical stainless steel container with an internal diameter of 600 mm. the position of the location, shape and so on scrapers and such fundamentally shown in Fig. 1-5.

In the device, in particular, two scrapers were placed so as to occupy the entire area of rotation of the inner bottom surface of the cylindrical container, with one additional scraper was located in such a way as to be adjacent to a corner between the inner bottom surface and inner side, and the remaining scraper was located in such a way as to adjoin the inner side.

b. Conventional device

Used high-speed mixing granulator campaign type (NMG-65L) manufactured by Nara Machinery Co., Ltd.

This mill has peremeci�ment of the blade, which rotate with high speed, attached to a cylindrical stainless steel container and having an inside diameter of 530 mm.

Mixing blades include three main blades with a width of 90 mm and an angle of 15 degrees, which are located at an equal distance in the circumferential direction, on the sleeve with a diameter of 170 mm. the diameter of the circle furthest from the center of the peripheral location of the stirring blades is 526 mm clearance between the bottom of the blade and the bottom of the container is 1 mm, and the gap between the most remote from the center of the peripheral location of the stirring blades and the side of the container is 2 mm.

2. The processed product

The treated product was tungsten trioxide (FI-WO3, D. A. L. M. T. Corp., having an average particle size in the range from 0.5 to 1.2 μm).

3. Binder

Used only water was added through one of the spray nozzle).

4. Test method

The test method was as follows.

and. The device according to the present invention

1) a predetermined amount (5 kg/batch) processed product loaded into the container.

2) Water as a binder were sprayed, while the container was rotated.

The speed of rotation of the container was Ob/min. Water feed rate was 150 ml/min, and the dosage was set at 13%, 14% and 15%, as shown in Table 1.

3) After the termination of the water, as shown in Table 1, the container is brought into rotation with a speed of 60 rpm, 75 rpm and 90 rpm, and pelletized corresponding processed products.

Time granulation tissue was determined as the time elapsed from the beginning of the feed water, when checking the status of the granulation of the processed products. Time granulation are shown in Table 1. The water was about 5 minutes for dosing 15%.

4) After granulation is then extracted processed product (granulated) cleaning brush with obtaining "granulated product", and the remaining product that sticks to the container, removed by means of scraping with getting "the adhesion of the product."

5) Both received "granulated product" and "adhesive product was dried in a thermostat with obtaining samples for evaluation.

Drying was performed at 120°C for 1 hour.

b. Conventional device

1) a predetermined amount (5 kg/batch) processed product loaded into the container.

2) Water as a binder was sprayed upon actuation of stirring blades to rotate.

The speed of rotation of the stirring blades was 100 rpm SKO�awn water flow was 150 ml/min, and the dosage was set at 12%, 13% and 15%, as shown in Table 2.

3) After the termination of the water agitators brought into rotation with a speed of 100 rpm, 200 rpm and 300 rpm, as shown in Table 2 and pelletized corresponding processed products.

Time granulation tissue was determined as the time elapsed from the beginning of the feed water, when checking the status of the granulation of the processed products. Time granulation are shown in Table 2. The water was about 5 minutes for dosing 15%.

4) After granulation, the product was extracted by opening the outlet opening during rotation of the stirring blades at a speed of about 100 rpm to obtain a granulated product; and the remaining product, which is stuck to the container, removed by means of scraping with getting "the adhesion of the product."

5) Both received "granulated product" and "adhesive product was dried in a thermostat with obtaining samples for evaluation.

Drying was performed at 120°C for 1 hour.

5. Method of evaluation

and. The output granules (variability of particle size of the product)

The received "granular products were sieved on a shaker Ro-Tap (D. Tanaka, Kagaku Kikai). Fraction from 106 to 1000 μm was adopted for the obtained granules. The results are shown together in Table 1 and Table�e 2.

The amount of sample was taken about 100 g, and the time of sifting - 10 minutes. At the time of screening were not allowed a concussion in order to prevent the destruction of the granular product when receiving a strong blow.

b. The degree of extraction

The degree of extraction was calculated based on the obtained corresponding "granulated product" and "adhesive product. The results are shown together in Table 1 and Table 2.

The recovery rate of equal mass proportions "granulated product" in relation to "granulated product" + "of the adhesive product."

6. The test results

Table 1
The device according to the present invention
No.The speed of rotation of the containers is RA (rpm)Dosage water (%)Time of the process (min)The output of the granules (%)The degree of extraction (%)
less than 106 micronsfrom 106 to 1000 µmmore than 1000 µm
Example 1 7515125,256,6The 38.298,8
Example 26015199,170,420,598,7
Example 3901596,461,532,199,4
Example 475133468,726,54,897,7
Example 57514259,463,627,097,9

Table 2
Normal �disorder
No.The speed of rotation of the change-shimauma of the blades (rpm)Dozy-
bottom water (%)
Time process
CA (min)
The output of the granules (%)The degree offers cance (%)
less than 106 micronsfrom 106 to 1000 µmmore than 1000 µm
CP. example 110015213,762,433,966
CP. example 220015116,37,486,359
CP. example 33001592,98,388,854
CP. example 4100 13191,569,728,846
CP. example 5100123461,619,019,455

7. Assessment

and. The output granules (variability of particle size of the product)

When using the device of the present invention, the output of granules having a target particle size in the range from 106 to 1000 μm, was high at 60-70% in all tests except sample 13% - the lowest dosage of water, even if you change the number of revolutions of the container and the dosage of water.

In the case of conventional devices, the output of the granules at the level of 60% could be obtained depending on the experimental conditions. However, the proportion of more than 1000 μm was very large, and so-called pieces of large size were encountered in significant quantities when I changed the number of revolutions of the stirring blades even for the same dosage of water.

Thus, it is established that during normal use of the device the flow of the granulation is too fast, and therefore difficult to control the particle size.

b. St�stump extraction

It was not observed a strong adhesion of the processed product to the container in any of the tests, which used the device of the present invention, and "granular particles" can be obtained with a high degree of extraction, component essentially 100%.

In the case of conventional devices, in contrast, showed a strong adhesion to a corner part between the bottom side and the side of the container with considerable soft adhesion of the side surface, and the degree of extraction was at very low levels of 40-60% (adhesion 1/3-1/2 of the total loaded quantity).

It follows from the foregoing that the device of the present invention has a differentiating effect in relation to the conventional device.

INDUSTRIAL APPLICABILITY

The above-described method, the granulation of powder and apparatus for granulation in accordance with the present invention has been to reduce the number of cleaning operations for the adhesive layer, the operations during the operation or to reduce the number of cleaning operations from the adhesive layer after unloading the product (before the next load source of the material) and allow it to increase efficiency and productivity, and to increase the degree of extraction of the product and more uniform particle size of the product. Accordingly, the present �turbine zobretenie can be widely used for granulation of the starting material powder of various types, for example, drugs, food, pesticides, feed, fertilizer, minerals and the like.

1. Method of granulation of powder, including:
bringing in rotation with the bottom of a cylindrical container that holds the powder, so that its lower surface rotates in a horizontal plane;
the generation of motion in the form of twisted rope in the powder in the container, through a plurality of scrapers which are located so that they are adjoined or was coming close to the inner side of the rotating container, in the position in which its front end is tilted so that it faces the direction of rotation of the container; and
the supply of adhesive in the container for the granulation of powder.

2. Method of granulation of the powder according to claim 1, in which the motion in the form of twisted rope in the powder in the container, is generated by bringing the container into rotation in a position where scrapers are fixed.

3. Method of granulation of the powder according to claim 1, in which the motion in the form of twisted rope in the powder in the container, is generated by bringing the container into rotation, while the scrapers are driven along the inner side of the container.

4. Method of granulation of the powder according to any one of claims. 1-3, in which the container is driven in rotation with the outer linear� speed from 1 to 5 m/s.

5. A device for the granulation of a powder containing:
having a bottomed cylindrical container that holds the powder, and the container is rotated so that its lower surface rotates in a horizontal plane;
numerous scrapers, which generate traffic in the form of twisted rope in the powder in the container, and a variety of scrapers positioned so as to abut or approach close to the inner surface of the container in the position in which its front end is tilted so that it faces the direction of rotation of the container; and
the nozzle that delivers the binder in the container.

6. A device for the granulation of the powder according to claim 5, in which the scrapers are arranged separately so as to abut or come close close to all the inner bottom surface and inner side surface with which it comes in contact loaded into the powder container.

7. A device for the granulation of the powder according to claim 5, in which the scrapers are arranged separately so as to abut or approach close to the inner bottom surface, an inner side surface and the angle between these surfaces of the container.

8. A device for the granulation of the powder according to claim 5, in which scrapers are adjacent or approaching close to the inner bottom surface of the container, or is� separately for the internal periphery and the external periphery of the container, or are only the external periphery of the container, while in the Central part of the container is formed conical or essentially hemispherical portion of the liner.

9. A device for the granulation of a powder according to any one of claims. 5-8, in which scrapers by means of rods attached to the machine frame of the device for the granulation.

10. A device for the granulation of a powder according to any one of claims. 5-8, in which scrapers are brought into abutment with the inner side of the container under the action of the driving force of springs, or scrapers forced to depart from the inner side of the container when the preset load or large scrapers attached to.

11. A device for the granulation of a powder according to any one of claims. 5-8, in which scrapers are located at an equal distance in the circumferential direction of the container.

12. A device for the granulation of a powder according to any one of claims. 5-8, in which many scrapers are located on the frame of the machine is movable in the radial direction of the inner bottom surface, which rotates in a horizontal plane and in a vertical direction inner side, which smoothly mates with the inner bottom surface of the cylindrical container so that the front ends of a plurality of scrapers are adjacent or approaching close to the inner bottom surface and inner �okoboi side of the cylindrical container.



 

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