Device for treating powder particles by rotary flow

The present invention relates to a rotating fluidized bed apparatus for powder particle. A gas circulation path is formed at the periphery of the treatment chamber 2 via the circumferential faceplate 202, 212, and the circumferential faceplate is adapted to rotate around an axis. Behavior of powder particles can be controlled by introducing gas from the periphery of the treatment chamber via the circumferential plate 212 to exert centripetal force on the powder particle, while exerting centrifugal force on the powder particles accompanying rotation of the circumferential plate 212. In another aspect, by making the arrangement proportion of the bag filter 5 inside the treatment chamber 2 wider than the surface width of the dispersion plate 212 or larger than the surface area of the dispersion plate 212, it is possible to cause gas that has flowed into the treatment chamber 2 to be discharged at a lower rate at an axial region inside the treatment chamber 2 where centrifugal force is weak and discharge rate is fast. It is possible to carry out optimal operation control of introduction and discharge of gas for fluidized bed behavior.

TECHNICAL FIELD

The present invention is in the field of fluidized bed apparatus for treating powder particles by mixing, granulating, coating, surface treatment, drying, reaction etc., and particularly relates to a fluidized bed apparatus suitable for treating fine powder particles.

BACKGROUND ART

Generally, a fluidized-bed apparatus, as shown inFIG. 20, is known as a device for allowing mixing, granulation, coating, drying or reaction of powder particles by causing a gaseous body such as various gases or air to flow in to the inside of a treatment chamber.

This fluidized-bed apparatus is formed of a truncated cone-shaped container2A having a dispersion plate3A (for example, a punched porous plate) for ventilation arranged at the bottom. When this apparatus is used to dry powder particles, heated air is made to flow in to the container2A from below the dispersion plate3A, and powder particles1A put inside the container2A are dried while being subjected to suspension fluidization.

On the other hand, when using this apparatus for granulation processing, a specified binder fluid (liquid) for granulation (for example, a solution such as carboxymethylcellulose, polyvinyl alcohol, or hydroxypropyl cellulose) is sprayed from a nozzle4A to powder particles being fluidized to granulate by forming solid bridges between particles by allowing drying of the powder particles at the same time as wet curing.

Recently, in fields such as medical supplies, agricultural chemicals, fertilizers, foodstuff, ceramics etc., there has been a demand to increase the functionality possessed by particles, and to endow particles with new functions in order to manufacture high quality products. There has therefore also been a demand, in the granulation process, for processing of fine powder particles of raw material in the micron and sub-micron order. Specifically, if granulated products of about 50 μm are to be produced, it is necessary to handle fine powder particles of 10-30 μm and also single order micron fine particles as the raw material.

However, since cohesiveness and adhesiveness increase rapidly as particle diameter of the processing material becomes smaller, it is not possible to uniformly fluidize and disperse the powder particles with the previously described existing fluidized bed apparatus. On the other hand, there is a problem that if the amount of heated air supplied is increased in order to achieve uniform fluidization and dispersion, the body of fine powder particles will fly out as it is, handling is extremely difficult, and it is not possible to carry out control to form a satisfactory fluidized bed. Therefore, with the fluidized bed apparatus of the related art, there is a limit to effective fluidized bed control due to the structure of the apparatus itself.

The object of the present invention is to completely solve the above described problems, and to form a fluidized bed controlling behavior of powder particles by introducing gas from outside the treatment chamber via a circumferential faceplate to provide centripetal force to powder particles inside the treatment chamber, and providing centrifugal force on the powder particles in accordance with rotation of the circumferential faceplate. By doing this, it is possible to provide a fluidized bed apparatus for a body of powder particles that can perform various types of processing such as mixing, granulation, coating, drying and reaction even for fine powder particles in the micron or sub-micron range.

In actually realizing such a fluidized bed apparatus, there are various problems to be solved in implementation of the overall structure of the apparatus with taking manufacturability and maneuverability into consideration, such as the specific arrangement and interrelation of various equipment, such as a gas supply device, operation control device, motor, granulation nozzle, operating panel, gas supply piping, wiring etc. as well as maintaining optimization of influx and discharge of gas attributable to size of the treatment chamber and blockage of a bag filter etc.

Another object of the present invention is to solve the problems facing actual making of products described above, and to cause slowing of discharge velocity of gas that has been introduced inside the treatment chamber at an axial region inside the treatment chamber where discharge velocity is high with weak centrifugal force. By doing this, it is possible to efficiently discharge gas that has been introduced into the treatment chamber while balancing centripetal force and centrifugal force on the powder particles regardless of the particle size, and it is possible to carry out optimal operation control of introduction and discharge of gas for fluidized bed behavior. It is also possible to anticipate improved product collection rate by reducing the amount of powder particles sticking to a bag filter accompanying gas flow, and reducing the amount of discharge through the bag filter.

A further object of the present invention to cause gas to flow in to the inside of the treatment chamber in a uniform manner from the entire surface region of gas ventilation means and not excessively circulating gas supplied to gas introduction means, as well as reducing the diameter of a gas supply port, and to enable manufacture of a supply structure without causing a gas supply path to project to the outer surface of a casing. As a result of doing this, arrangement of gas introduction means and a casing and arrangement of the gas introduction means and a treatment chamber, and interrelation between gas introduction means and a gas supply device is optimized, a supply structure for gas in the apparatus overall is simplified, and manufacture of the apparatus becomes simple.

DISCLOSURE OF THE INVENTION

Technical means adopted by the present invention in order to solve the above described problems is a rotating fluidized bed apparatus for powder particle for causing gas to flow in to a cylindrical treatment chamber in which powder particles are placed, via a circumferential faceplate having permeability, and discharging gas that has flowed into the treatment chamber from the treatment chamber via a bag filter, wherein a gas circulation path is formed at the periphery of the treatment chamber via the circumferential faceplate, and the circumferential faceplate is adapted to rotate around an axis.

Another technical means adopted by the present invention is a rotating fluidized bed apparatus for powder particle comprising, inside a casing, a rotatable treatment chamber having an axis and being provided with cylindrical gas ventilation means having permeability at its circumference about the axis, gas introduction means provided at the periphery of the treatment chamber for causing gas to flow into the treatment chamber via the gas ventilation means, and a bag filter, provided inside the treatment chamber, for discharging gas that has been introduced into the treatment chamber to the outside, wherein an arrangement proportion of the bag filter inside the treatment chamber is wider than a surface width of the gas ventilation means, or larger than the surface area of the gas ventilation means.

A still further technical means adopted by the present invention is a rotating fluidized bed apparatus for powder particle comprising, inside a casing, a rotatable treatment chamber having an axis and being provided with cylindrical gas ventilation means having permeability at its circumference about the axis, gas introduction means provided at the periphery of the treatment chamber for causing gas to flow into the treatment chamber via the gas ventilation means, and a bag filter, provided inside the treatment chamber, for discharging gas that has been introduced into the treatment chamber to the outside, wherein the gas introduction means is comprised of a gas introduction passage formed between the casing and the ventilation means, and a plurality of supply ports provided at specified intervals on an inner wall forming the gas introduction passage.

BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will now be described in detail based on a rotating fluidized bed apparatus for powder particle as a preferred embodiment.

A first embodiment of this apparatus having a vertical structure will be described based on FIG.1andFIG. 11that is also used with the second embodiment. Reference numeral1is a cylindrical casing, and inside this casing1a cylindrical treatment chamber2for treating a powder particle material is arranged with a specified space from an inner wall surface of the casing1.

In the treatment chamber2, a lower fixed plate201is rotatably linked via a rotation shaft301to a drive unit3. A circumferential faceplate202provided on an outer peripheral surface region of the cylindrical treatment chamber2is comprised of specified ventilation means for causing specified gas such as various gases or air to be introduced into the treatment chamber2in a manner enabling ventilation from a dispersion plate. The circumferential faceplate202is attached between the lower fixed plate201and an upper fixed plate203in a state of being sandwiched by these two plates, using bolts204, and can be attached and detached by tightening or loosening the bolts204. The dispersion plate can be suitably exchanged for a porous plate, slit, metal mesh, multilayer mesh, or metal fiber etc. having different diameter holes depending on physical properties, such as the particle diameter of the processed powder material.

A granulation nozzle4for spraying a supplied binder fluid for granulation is provided inside the treatment chamber2. Respective piping for supplying granulation binding fluid and compressed air to the granulation nozzle4is provided on the upper fixed plate203. A communicating port to a discharge pipe501housing a cylindrical bag filter5is also provided on the upper fixed plate203as discharge means for discharging gas that has been introduced into the treatment chamber2. Also, inFIG. 1the bag filter5is provided midway along the discharge pipe501, but the bag filter5can also be provided inside the treatment chamber2as shown in FIG.8and FIG.9.

In the case of a vertical apparatus, the powder particles are piled up in a lower portion due to gravity, and this tends to occur more with small particle diameter, causing bad fluidity. This means that even if the treatment chamber2is caused to rotate to apply centrifugal force to the powder particles inside the treatment chamber2, there is a tendency for the layer thickness (a distance from the circumferential plate202in an axial direction) of a powder particle layer to increase towards the lower side. Reference numeral202ais a bottom surface plate for variable adjustment of internal volume of the treatment chamber2, namely, the height of the treatment chamber2, and gas flow supplied from gas inflow means passes uniformly through the circumferential plate202to simply form an appropriate fluidized bed. An arbitrary plate such as a non-porous plate or porous plate (enabling inflow of specified gas from underneath) is adopted as the bottom surface plate202a.

The casing1has a through hole through hole for a rotating shaft301in a bottom part, is formed from a container101having a supply port103for supplying a specified gas (various gases such as heated air, inert gas etc.) to a side section and a cover body102having a communication port connecting between pipe holes for various piping for supplying granulation binder fluid and compressed air to the granulation nozzle4and a discharge pipe501, and the cover body102is fastened to a flange section104of the container101so as to be capable of being opened and closed using a bolt104.

As the gas, heated air that has been produced by heating air conveyed from a blower6with a heater601is used, and this heated air is sent through the supply pipe105to the supply port103. Also, compressed air that has been supplied from a compressor602and granulation binder fluid supplied from a binder supply device604are respectively fed to the granulation nozzle4so as to be finely sprayed to the inside of the treatment chamber2. In order to generate finely granulated material, a so-called two-fluid or four-fluid fine spray nozzle is preferably used as the granulation nozzle4.

A specified space formed between an inner wall surface of the casing1and an outer surface region of the circumferential plate202(ventilation means) of the treatment chamber2is formed as a circulation path205for heated air that has been supplied from the supply port103.

For supplying heated air to the circulation path205, as shown inFIG. 11, the supply port103is arranged to supply heated air towards the rotation direction of the treatment chamber2, while the supply pipe105is arranged at a side surface of the casing1from a substantially tangential direction to the same direction of rotation as the treatment chamber2, so as to further stabilize the supply of heated air.

Gas inflow means for causing heated air to flow dispersedly into the inside of the treatment chamber2via the circumferential plate202is formed using the circulation path205and the supply port103.

Heated air that has flowed into the treatment chamber2passes from a communication port opened in the cover body102though the bag filter5and is discharged to the outside via the discharge pipe501.

A pulse jet nozzle603for spraying the compressed air from the compressor602is provided above the bag filter5, and by spraying the compressed air intermittently in the direction of the bag filter5, powder particles collected by the bag filter5are returned to the treatment chamber2.

FIG. 2toFIG. 9show a second embodiment enabling construction of a horizontal apparatus.FIG. 11is an explanatory diagram that is also used with the first embodiment. With this apparatus, the bag filter5is arranged at an axial section of the inside of the treatment chamber2, and the bottom surface plate202ais not provided inside the treatment chamber2. The remaining structure and concept of the fluidized bed are the same as for the first embodiment.

FIG. 2is an overall front view of the fluidized bed apparatus, andFIG. 3is an overall side view of the fluidized bed apparatus. As shown in these drawings, the casing1is fixed to a body bracket116at a bottom part, and is attached to a frame7via this body bracket116. A pair of left and right arm shaped support frames711are erected at specified intervals on this frame7, while a pair of left and right support shafts116aprojecting outwards to the left and right are provided on the body bracket116, and the support shafts116aare rotatably supported in the support frames711. In this way, the casing1is constructed capable of changing orientation of the rotating shaft of the treatment chamber2by rotating from horizontal to vertical, and can be used in either of a case where the treatment chamber2shown inFIG. 1is a vertical type or is a horizontal type. In this apparatus, in the case of a vertical type apparatus, feeding in and taking out of the powder particles is carried out with the opening section112aof the casing1facing upwards (rotation axis vertical), and granulation processing is carried out with the opening section112afacing sideways (rotation axis horizontal).

FIG. 4is a side view showing a rotation operation mechanism of a treatment apparatus body, andFIG. 5is an essential detail drawing of the rotation operation mechanism. As shown in these drawings, a rotation operation mechanism8for rotation operation of the casing1is provided on an outer side of the right support frame711in FIG.2. The rotation operation mechanism8is comprised of a large diameter gear811provided integrally with the right support shaft116a, a small diameter gear812meshing with the large diameter gear811, a worm wheel813rotating integrally with the small diameter gear812, a worm814meshing with the worm wheel813, and a handle shaft815for rotatably operating the worm814. A handle816is provided on a front end of the handle shaft815, and by turning the handle816, that operation force is transmitted through the worm814, worm wheel813, small diameter gear812and large diameter gear811to the support shaft116a, and the casing body1is turned. Since the worm814is then interposed in this transmission path, it is possible to reduce the handle operating force by ensuring a large reduction ratio, while at the same time having a structure enabling the casing body1to be fixed to an arbitrary position by a brake operation of the worm814.

FIG. 6is a front view showing a casing body1of a fluidized bed apparatus,FIG. 7is a rear view showing the casing body1,FIG. 8is a side cross-sectional view showing the casing body1andFIG. 9is an essential cross-sectional view of a treatment chamber. As shown in these drawings, the casing body1of the fluidized bed apparatus is a cylindrical shape having an opening section112aat a front surface part, and the air circulation path215, the treatment chamber2having a front section opened and the bag filter5arranged at an axial region inside the treatment chamber2are provided inside the casing body1.

The air circulation path215is formed between an inner wall surface of the casing1and an outer surface region of the circumferential faceplate212(dispersion plate), as ventilation means for the treatment chamber2. A rear surface part112bof the casing1is integrally fixed to the body bracket116, while an opening part112aof the front surface part is covered by a disk-shaped cover body112formed from a transparent acrylic resin. The cover body112has an outer edge section fixed to the casing1using a plurality of butterfly bolts117, and can be attached and detached by tightening or loosening the butterfly bolts117.

Also, the supply port113for introducing a specified gas (various gasses such as heated air, inert gas etc.) into the air circulation path215is formed in a right upper part of the casing1, and is adapted to cause gas that has been introduced from the supply port113to circulate along the inner surface of the casing1, as shown in FIG.11. For example, in the case of introducing heated air, air generated by a blower6, as with the gas inflow means of the first embodiment shown inFIG. 1, is heated by the heater601and introduced to the supply port113.

The treatment chamber2is formed so that a disk-shaped rear fixed plate211and a disk-shaped cover body216formed of transparent acrylic resin are opposite each other with a specified distance between them, with a circular dispersion plate212fitted between them. The fixed plate211and the cover body216are connected by a plurality of bolts214, and attachment and detachment of the cover body216and the dispersion plate212is made possible by tightening or loosening the bolts214. The dispersion plate212is arranged with a specified distance with respect to the inner wall of the casing1, and has such a structure that gas introduced from the supply port113to the air circulation path215flows into the treatment chamber2through the dispersion plate212. The dispersion plate212can be appropriately replaced with one having different hole diameters or material properties, depending on the particle diameter of the powder particles being processed, etc., and it is possible to use a porous plate, slits, metal mesh, multilayer metal mesh, metal fiber etc. For example, since a multilayer metal mesh is formed by superposing a plurality of metal meshes having different sized openings, and sintering them at a specified pressure and temperature, it is possible to prevent the mesh becoming clogged with powder particles by having a structure with metal meshes of fine openings on the surface contacting the powder particles.

A cylindrical rotation support shaft217extending to the rear is integrally connected to a central part of the rear fixed plate211, and the rotation support shaft217is rotatably supported in an inner periphery portion of a cylindrical holder118provided on the body bracket116via a pair of bearings119. A motor3(drive unit) is arranged beneath the rotation support shaft217, with a pulley312integrally provided on a motor shaft311of the motor3and a pulley313integrally provided on the rotation support shaft217being connected through a transmission belt314. In this way it becomes possible to rotate the treatment chamber2in response to drive of the motor3and supply centrifugal force to the powder particles inside.

The bag filter5is formed from cylindrical mesh plates and is fitted between a disk-shaped rear plate512having an opening at the center and a disk-shaped front plate513formed of transparent acrylic resin that are opposite each other with a specified distance between them. The rear plate512and the front plate513are connected using a plurality of bolts514, and the front plate513and the bag filter5can be attached or removed by tightening or loosening the bolts514. The bag filter5is arranged at a specified interval with respect to the dispersion plate212, and is configured so that gas that has flowed into the treatment chamber2via the dispersion plate212is discharged through the bag filter5. The bag filter5can be appropriately replaced with one having different hole diameter or material properties depending on particle diameter of the powder particles being processed, and as well as materials used for the dispersion plate212it is also possible for the bag filter to have a cylindrical structure using a retainer and bag shaped bag cloth (woven or non-woven fabric) made of various materials for covering the retainer.

A cylindrical discharge pipe511extending to the rear is integrally connected to a central opening section of the rear surface plate512, configured so that gas that has been discharged from the treatment chamber2via the bag filter5is discharged to the outside of the apparatus (outside the system) via the discharge pipe511. The discharge pipe511is rotatably supported in an inner part of the rotation support shaft217, and also a rotation operation lever515is integrally provided on a rear end of the discharge pipe511. The rotation operation lever515is for operation when the powder particles have accumulated on the bag filter5, and it is permissible to rotate the bag filter through about 180°.

The granulation nozzle4is provided inside the bag filter5, as shown in FIG.9. The granulation nozzle4is connected to a binder supply device and a compressor (refer toFIG. 1) via piping, and a specified granulation binder supplied from the supply device is sprayed into the treatment chamber2.

FIG. 10is a schematic cross sectional drawing showing another example for driving the bag filter5of the second embodiment. In the processing apparatus shown inFIG. 10, the rotation operation lever515is not provided on the discharge pipe511, and the structure is such that powder particles on the bag filter5are made to fall by causing the bag filter5to rotate using drive force of the motor3. A pulley315is provided on the discharge pipe511of this embodiment instead of the rotation operation lever515. Pulleys312and316are provided next to each other on a motor shaft311, and a so-called dual rotation axis mechanism is adopted to convey drive force of the motor3to the discharge pipe511via a transmission belt317suspended between the pulleys315and316. With rotation of the dispersion plate212and the bag filter5by drive force of the motor3, a transmission ratio is set such that angular velocity of the bag filter5and angular velocity of the dispersion plate212do not match. Piping for the granulation nozzle4is such that an end of the granulation nozzle4is jointed with the other end in a rotatable manner so that it is possible to rotate the end integrally with the bag filter5. In this way, the granulation nozzle4provided in the bag filter5is prevented from spraying granulation binder fluid to only a specified region of the dispersion plate212. For the detailed structure of a dual rotation axis mechanism it is possible to reference Japanese patent application No. Hei. 11-43238 (Patent laid-open No. 2002-143705), and with the structure mentioned in this document, the bag filter5and the dispersion plate212are caused to rotate in the same direction, but they can also be caused to rotate in opposite directions.

Next, a description will be given for the apparatus having this type of structure of a method for carrying out drying treatment while mixing and granulating powder particles, based on FIG.12and FIG.13. Description will be given focusing mainly on the second embodiment, but the first embodiment can also be appropriately referred to. In introducing a fixed amount of powder particles into the inside of the treatment chamber2, first of all the cover body112(102) and cover body216are opened with the opening section112aof the casing1facing upwards (vertical type), a specified amount of powder particles are introduced into the treatment chamber2and the cover body112and cover body216are closed. After that, the orientation of the casing1is changed to a lateral manner, the powder particles are subjected to centrifugal force by driving the motor3to rotate the treatment chamber2, and powder particles accumulate in a uniform manner at the inner wall surface of the circumferential surface plate212(202). By causing heated air introduced to the circulation path205(215) to flow into the inside of the treatment chamber2via the circumferential surface plate212(202), the powder particles are subjected to centripetal force to cause dispersed fluidization, and a fluidized bed is formed.

It is possible to carry out continuous operation by providing the supply discharge pipe for material inside the discharge pipe511(501), and it is also possible to easily introduce the specified amount of particles in a short time if powder particles are introduced while rotating the treatment chamber2. By causing compressed air to flow inside the treatment chamber2using the granulation nozzle4, as required, it is possible to form the fluidized bed smoothly, and it is possible to form a powder layer of uniform thickness in an extremely short time.

At that time, in the first embodiment the height of the treatment chamber2is adjusted as required using the bottom surface plate202aand by supplying heated air from below by employing a porous plate for the bottom surface plate202aand supplying compressed air from the granulation nozzle4before carrying out a granulation operation, it is possible to cause suspended fluidization of the powder particles. In this way, it is possible to form a fluidized bed smoothly from initial operating conditions, and if the adjustment and supply are used together they can be used to assist in uniform formation of a fluidized bed even during operation.

Here, inside the treatment chamber2fluidization commences from the particle body layer surface because wind velocity is slightly faster at the inner side of the particle body layer (axial direction) and centrifugal force applied to the powder particles is small. Accordingly, by changing the amount of heated air supplied, even if rotational speed of the treatment chamber2is constant, it is possible to control the powder particles from a fixed bed where there is no fluidization to a completed fluidized bed. InFIG. 13, (A), (B) and (C) respectively represent a fixed bed, a partial fluidized bed and a completely fluidized bed.

At a section where the powder particles are being fluidized, respective particles of the powder particles exhibit the microscopic fluidizing behavior shown inFIG. 12due to balance adjustment of the centrifugal force and the centripetal force. At this time, a pressure difference arises in front of and behind the powder particle layer through which heated air passes, and inside the casing body1, the inside of the circulation path215(205) exhibits high pressure while the inside of the treatment chamber2exhibits low pressure. This pressure difference become larger with increase in powder particle layer thickness, rotational speed of the treatment chamber2and amount (flow rate) of heated air. If the powder particle layer thickness and the rotational speed of the treatment chamber2are constant, the pressure difference increases together with flow velocity, but remains constant once a specified velocity is reached, with this time being a state where there is complete fluidization. This velocity is taken to be the velocity when complete fluidization commences. This minimum fluidization velocity can be calculated logically from a relationship between pressure difference and flow rate of the powder particle layer. Therefore, the behavior of the powder particles inside the treatment chamber2brings about a structure that enables sequential behavioral control of a balance between rotational speed of the treatment chamber2and air supply amount from a state where the fixed bed is formed causing centrifugal pressing of the powder particles towards the circumferential plate212(202) to a state where a fluidized bed is formed causing centripetal dispersion to the axial region, by adjusting the pressure difference between the air circulation path215(205) and the inside of the treatment chamber2.

In the case of the vertical type apparatus of the first embodiment, the powder particles are susceptible to the effects of gravity, which means that in order to cause fluidization of the powder particles a larger flow velocity than the calculated value is required, and since effects of gravity become more severe with smaller particle diameter and bad fluidity, in controlling the apparatus it is preferable to confirm the powder particles used in advance through usage measurement.

According to this type of control means for controlling centrifugal force and centripetal force, it is possible to control behavior of the powder particles shown in FIG.13. However, even with a fine spray of binder fluid in the fixed bed state (FIG.13(A)) where the powder particles are completely not fluidized so as to give a state where a layer is only and in a partially fluidized bed where only the inside of the power particle layer is fluidized (FIG.13. (B)), it is difficult to carry out uniform granulation treatment on the powder particles that have been introduced into the treatment chamber2. Therefore, normally mixing, granulation and drying are carried out using the complete fluidized bed of FIG.13(C).

It is also possible to carry out granulation by repeatedly carrying out an operation of subjecting the powder particles to a centrifugal force larger than the centripetal force and compressing the powder particles by pressing to the circumferential plate212(202) side, and an operation of exerting centripetal force and centrifugal force in a balanced manner to uniformly fluidize the powder particles, that is, by repeatedly forming the fixed bed of FIG.13(A) and the complete fluidized bed of FIG.13(C). It is also preferable to finely spray binder fluid in this case, but since granulation is possible with a small amount of binder fluid it is possible to significantly reduce the energy cost required in drying.

FIG. 14is an explanatory diagram showing a usage example of the rotation operation lever515. As shown inFIG. 14, in the case of processing the powder particles, the powder particles are introduced into the treatment chamber2(FIG.14(A)) and the treatment chamber2is rotated (FIG.14(B)). Initial rotation is at a slow rotational speed, and since centrifugal force acting on the powder particles is small, the powder particles drop freely and accumulate on the bag filter5(FIG.14C)). If the rotational speed of the treatment chamber2reaches a specified speed, almost all of the powder particles are formed into a powder particle layer on an inner surface of the dispersion plate212due to centrifugal force, and since centrifugal force is not exerted on the powder particles that have accumulated on the bag filter5it is maintained in that state (FIG.14(D)). If the rotation operation lever515is then operated to rotate the bag filter5by about 90°, the powder particles that have accumulated on the bag filter5fall down (FIG.14(E)) and is assimilated into the powder particles forming the layer on the inner surface of the dispersion plate212due to gravity and centrifugal force.

As a method that does not use the rotation operation lever515, it is possible to utilize a structure where the above described bag filter5is caused to rotate by the drive force of a motor3, to cause the powder particles on the bag filter5to drop off. Alternatively, it is possible to utilize a structure that uses a retainer and bag shaped bag cloth for covering the retainer, and to intermittently blow compressed gas from the discharge pipe511to instantaneously inflate the bag cloth and cause the powder particles to fly off.

In the embodiment of the present invention having the above described structure, mixing, granulation and drying are carried out by forming a fluidized bed of powder particles inside the treatment chamber2. With the apparatus, the treatment chamber2is configured to be capable of causing rotation of a circumferential plate212(202) about an axis, as ventilation means constituted by a dispersion plate, and also, heated air supplied from the gas inflow means via this rotatable circumferential plate212(202) is introduced to the inside of the treatment chamber2. As a result, in the fluidized bed of the present apparatus, behavior of the powder particles inside the treatment chamber2is controlled by control means for controlling centrifugal force due to rotation of the treatment chamber2and centripetal force due to the inflow of heated air. This means that with respect to powder particles inside the treatment chamber2it is possible to supply the effect of forces from opposing directions, namely the centrifugal force and centripetal force, in a balanced manner, and behavior control is possible to cause dispersive fluidizing while maintaining a state where the powder particles are allowed to accumulate uniformly inside a specified region at the circumferential plate212(202) side. Also, even if heated air required to uniformly disperse the powder particles is supplied, since centrifugal force acts on the powder particles, a good fluidized bed is formed where there is no danger of the powder particles being blown off as with the fluidized bed apparatus of the related art, and it is possible to treat fine particle powder in the micron and submicron range.

It is also possible to easily carry out a balance adjustment operation for the centrifugal force and the centripetal force using control means, and for the powder particles it is possible to carry out behavior control so that a fixed bed, partially fluidized bed and completely fluidized bed are appropriately formed. As a result, during the granulation treatment, from a fixed bed to a complete fluidized bed are repeatedly formed, and it is anticipated that processing efficiency will be improved by carrying out compression treatment of the powder particles, in addition to cohesive force and adhesive force possessed by the source powder particles itself, to make it possible to generate a strong granulated material.

Further, behavior of the powder particles is such that the powder particles accumulates inside a specified region at the circumferential plate212(202) side to form a fluidized bed, it is possible to arrange the granulation nozzle4and bag filter5in a rotational center region inside the treatment chamber2without there being any negative influence on the fluidization process, and it is possible to make practical use of space inside the treatment chamber2.

The treatment chamber2of this embodiment is formed in a cylindrical shape, but this is not limiting and it is also possible to form the chamber in a truncated cone shape or with a central section expanded as long as the cross section at an arbitrary position is a concentric circle, and a completely or partial dual cylinder structure is also possible. In the case of using a shape other than a cylinder for the treatment chamber2, powder particles that have accumulated at the circumferential plate212(202) side form a fluidized bed that is inherent to the shape of the treatment chamber2, for example having a partially different thickness, and it is possible to carry out mixing, granulation and drying treatment using this type of treatment chamber2.

A circulation path215(205) for air is formed between the inner wall surface of the casing body1and an outer surface region of the circumferential plate212(202) maintaining a specified space, and the gas inflow means is comprised of supply port113(103) for introducing heated air from the supply device (blower6) and the circulation path215(205). As a result, heated air is made the same pressure inside this circulation path215(205) making it possible to cause uniform dispersive flow inside the treatment chamber2. This circulation path215(205) has, for example, openings of ventilation holes in the circumferential plate212(202) that are larger than powder particles, and the powder particles are discharged to the circulation path215(205) side during treatment air flows into the treatment chamber2through the circumferential plate212and flow path for discharging to the bag filter5is formed which means that discharged powder particles can be re-introduced into the treatment chamber2.

The gas inflow means is made up of the supply port113(103) and circulation path215(205), as described previously, but this is not limiting and it is not essential to provide the circulation path215(205) as long as the structure equally supplies heated air to the circumferential plate212(202) from the outer surface region thereof.

The supply port113(103) is arranged at a side surface of the casing1so as to supply heated air towards the same rotational direction as the treatment chamber2. As a result, heated air that has been supplied from the supply port113(103) to the circulation path215(205) flows in a constant direction (rotation direction of the treatment chamber2) inside the circulation path215(205), and smoothly flows dispersively into the inside of the treatment chamber2, uniformly from the ventilation holes of the circumferential plate212(202), which means that it is possible to exert equal centripetal force on the powder particles.

Discharge means including the bag filter5for discharging heated air that has flowed in to the inside of the treatment chamber links to a central region of the treatment chamber2, and heated air inside the treatment chamber2can be efficiently discharged from a rotational center regions without exerting any detrimental effect on the behavior of the powder particles. By making it possible to arrange the bag filter5at the central region, the overall apparatus can be made compact by making effective use of the rotational central region.

The control means is configured so that it is possible to control behavior of the powder particles from a fixed bed formation state, where the powder particles are centrifugally pressed to the circumferential plate212(202) side to accumulate at a uniform thickness, to a fluidized bed formation state, where the powder particles are centripetally dispersed in the axial direction, by balance adjustment of the rotational speed of the treatment chamber2and the supplied amount of air. Accordingly, using the control means, balance adjustment of the centrifugal force and centripetal force can be carried out easily, and it is possible to carry out processing of the powder particles using behavior control to appropriately form a fixed bed, a partial fluidized bed and a complete fluidized bed. During granulation processing, granulation becomes possible using behavior control to repeat the compression in the fixed bed formation state and the dispersion in the fluidized bed formation state, and it is anticipated that processing efficiency will be improved by carrying out compression treatment of the powder particles, in addition to cohesive force and adhesive force possessed by the source powder particles itself, to make it possible to generate a strong granulated material.

The granulation nozzle4is provided inside the treatment chamber2at a central section, and granulation binder fluid is finely sprayed from the granulation nozzle4towards the circumferential plate212(202) direction. As a result, since the granulation binder fluid itself is also uniformly sprayed to the circumferential plate212(202) side due to the centrifugal force, it is possible to wet the powder particles efficiently and to perform granulation treatment.

With this apparatus, the structure is such that together with the inflow of gas through the porous circumferential plate212to the cylindrical treatment chamber2holding the powder particles, gas flowing into the treatment chamber2is discharged to the outside of the treatment chamber2through the bag filter, and also, together with formation of the circulation path215for gas by means of the circumferential plate212at an outer side of the treatment chamber2, the bag filter5is arranged at an axial inner section of the treatment chamber2, with the circumferential plate being capable of rotation in a direction around the bag filter5. Accordingly, it is possible to cause centrifugal force to act on the powder particles in accordance with rotation of the circumferential plate212, while gas flows in from the outer side treatment chamber2through the circumferential plate212, and even if there are fine particles of powder in the micron or submicron range it is possible to carry out various treatments such as mixing, granulation, coating, drying and reaction while controlling the behavior of the powder particles. Furthermore, in a rotation center region where there is no detrimental effect on the behavior of the powder particles inside the treatment chamber2, the entire filter surface of the bag filter5is used uniformly making it possible to discharge the inflowing gas in an equally dispersed manner, unevenness of the gas is avoided and it is expected that behavior control to achieve balance of the centrifugal force and the centripetal force will be simplified contributing to formation of a uniform and stable fluidized bed, and it is also anticipated that it will be possible to improve processing efficiency dramatically.

Since the granulation nozzle4is provided inside the bag filter5, not only is it possible to spray granulation binder fluid from a central part of the treatment chamber2, it is also possible to simplify the structure by also using the bag filter5as a support member for the granulation nozzle4.

The bag filter5is structured to be rotatable around its circumference, and is rotated using a rotation operation lever515(operation means), which means that it is possible to easily cause the powder particles that have accumulated on the bag filter5to drop off. Further, in another embodiment the bag filter5is structured to be rotatable about its circumference and rotated by a motor3(drive means), which means that operation of the rotation operation lever515is not required and it is also possible to cause forced separation of the powder particles on the bag filter5using centrifugal force and to prevent clogging of the bag filter5.

Because the angular velocity of the bag filter5and the angular velocity of the circumferential plate212different, the relative position of the granulation nozzle4and the circumferential plate212is varied and it is possible to spray granulation binder fluid to the powder particles without bias.

By intermittently blowing compressed air from a compressor to the bag filter5, fine powder particles shaken off the filter surface are mixed in with the powder particles forming the powder particle layer inside the treatment chamber2, which means that there is no problem of component separation.

The motor3and discharge pipe511(gas discharge path) are arranged at an outer rear side of the treatment chamber2, and since a cover body216and cover body112for opening and closing the treatment chamber2are arranged at the front of the treatment chamber2the structure is such that the treatment chamber2is closed inside the casing1and construction is made relatively simple. As a result, it is possible to make opening and closing and encapsulation of the treatment chamber2simple compared to the first embodiment.

The cover body216and the cover body112are formed from transparent material, which makes it possible to control the behavior of the powder particles while confirming the condition of the powder particles through observation.

By providing the casing body1provided with the treatment chamber2so that the rotational axis of the circumferential plate212faces in the horizontal direction, and having a structure enabling rotation about a support shaft116athat is horizontal and orthogonal to the rotational axis as a fulcrum, at the time of processing the powder particles it is possible to give the fluidized bed apparatus a horizontal structure, and compared to a apparatus having that structure vertically it is possible to form a favorable fluidized bed avoiding unevenness of the powder particles due to gravity, and since it is easy for the powder particles to collect uniformly at the inner wall surface side of the circumferential plate, it is possible to easily obtain a fluidized bed that has been uniformly dispersedly fluidized. As a result, volume adjustment of the inside of the treatment chamber2using the bottom surface plate202ais no longer necessary, transit dispersion of inflowing air by the circumferential plate212is made uniform, and there is the advantage that it is easy to perform behavioral control of the fluidized bed.

When not processing, it is possible to easily carry out introduction and removal of the powder particles by rotating the casing body1so that the opening section112aof the casing1faces upwards. Also, since it is possible to alter the structure of the casing1from a vertical type to a horizontal type, it is possible to use either a vertical type or a horizontal type, enabling treatment using an orientation changing process including a variation in inclination through a range of 0-90°.

The treatment apparatus body is rotated by means of a reduction gear mechanism including a worm814, which means that it is possible to reduce the handle operation force by ensuring a large reduction ratio, and it is also possible to fix the casing1at an arbitrary position by a braking action of the worm814.

Based onFIG. 15toFIG. 19, a description will now be given of a fluidized bed apparatus for powder particles representing a third embodiment of the present invention.FIG. 15is an overall perspective view of the fluidized bed apparatus,FIG. 16is an explanatory drawing for operation of a casing body,FIG. 17is a front view showing a casing body section of the fluidized bed apparatus,FIG. 18is a front view showing a state where an outer cover of the casing body is open, andFIG. 19is a side cross-sectional view showing a casing body section. This third embodiment is an improvement to the second embodiment, and the same reference numbers are used to represent members shared with the second embodiment. As shown in these drawings, the casing body1of the fluidized bed apparatus is a cylindrical truncated cone type having an opening section112aat a front surface section, and internally comprises a cylindrical treatment chamber2for treating powder particle material, an air inflow path (circulation path)215formed between the treatment chamber2and an inner wall surface of the casing, and a bag filter5arranged at an axial section of the inside of the treatment chamber2.

The air inflow path215is formed between the inner wall surface of the casing1and an outer surface region of the circumferential plate (dispersion plate)212as ventilation means for the treatment chamber2. The casing1is integrally fixed to a body bracket116having a substantially L-shaped cross section using bolts125at a rear surface section of the casing. The opening section112aat the front surface section of the casing1is covered by a substantially rhomboid flat disk-shaped outer cover body12containing circular transparent acrylic resin. The outer cover12is attached at an upper part to a hinge section122of a slide body128tip end so as to be capable of opening and closing upwards and downwards. The outer cover12also has a grip handle123at a lower part and left and right slot sections124,124. To open and close the outer cover12, left and right take-up handles126,126provided at outer side surfaces of the casing1capable of rotating horizontally are respectively joined to the slot sections124,124and the outer cover12is press-fitted to the casing1(opening section112a) by tightening to close the door, and the operation is reversed to open the door. The outer cover12in the open state can be stowed by sliding the slide body128provided so as to be capable of sliding with respect to guide bars127rearwards along the guide bars127, and the guide bars127have front ends respectively supported in a frame121bent in a stepped shape viewed from the side, and rear ends respectively supported on an upper part of a case cover11.

Supply ports13for introducing specified gas (various gas such as heated air, inert gas, etc.) into the air circulation path215are formed in the bracket116constituting the rear surface section of the casing1forming the inner wall of the air circulation path215, facing a surface region of the outer circumferential surface of the treatment chamber2. The supply ports13are holes of about 30mm diameter provided at 12 places in total at specified intervals. Gas introduced from these supply ports13is caused to circulate along the inner periphery of the casing1accompanying rotation of the treatment chamber2that is, rotation of the dispersion plate212about the axis as ventilation means, and gas inflow means is constituted by the air circulation path215and the plurality of supply ports13. A gas supply chamber131for equally distributing air from the gas supply device (not shown in the drawings) provided inside a frame7, which will be described later, is provided at a rear surface side of the supply ports13, and in the case of introducing heated air, for example, air generated by a blower, as gas supply means is heated by a heater and guided into the gas supply chamber131.

The supply ports13are not limited to being circular, and it is also possible to form them in an arbitrary shape, such as elliptical. It is also possible to provide a plurality of smaller supply ports13at an arrangement region of one supply port13, or to form the supply ports so as to impart directivity to an air jet.

The treatment chamber2is formed by making a substantially truncated cone shaped rear fixed plate221and a disc shaped inner cover216containing circular transparent acrylic resin face each other at a specified distance, and fitting the cylindrical dispersion plate212between them as ventilation means. The inner cover216can be attached to and removed from the fixed plate221. The fixed plate221comprises a ring-shaped upright section221a rising up in an axial direction from the dispersion plate (circumferential plate)212and having an arbitrary width, and an inclined section221bextending from the upright section221a. A plurality of bolt pins214aare provided on the upright section221a, and a plurality of attachment holes214b, each of which is formed by integrally connecting large and small holes, are provided in the inner cover216. In attaching the inner cover216to the fixed plate221, large holes of the attachment holes214bare fitted over bolt heads of the bolt pins214a, and abut against the bolt heads by rotating the inner cover216to the small hole side and fixing using upper and lower bolts. When removing the inner cover216it is possible to carry out the reverse operation and it is possible to attach and remove the inner cover216together with the dispersion plate212. The dispersion plate212is arranged a specified distance from the inner wall surface of the casing1and gas that has been introduced to the air (gas) circulation path215flows into the inside of the treatment chamber2through the dispersion plate212.

The granulation nozzle4for two-fluid fine spraying is provided inside the treatment chamber2. The granulation nozzle4, is connected through piping to a binder supply device, not shown, and a compressor, not shown, and a specified granulation binder fluid supplied from the supply device is sprayed to the inside of the treatment chamber2.

The dispersion plate212can be appropriately replaced by a dispersion plate of differing hole diameter or material properties depending on the particle size of the powder particles to be processed, and it is possible to use a porous plate, slits, metal mesh, multi-layer metal mesh or metal fiber etc. For example, a multi-layer metal mesh is formed by overlaying a plurality of meshes having different mesh sizes, and sintering at a specified pressure and temperature, and it is possible to prevent clogging with powder particles by forming a metal mesh of a fine mesh size.

A cylindrical rotation support shaft217extending rearwards is integrally connected to a central part of the rear fixed plate221, and the rotation support shaft217is rotatably supported via a pair of bearings119at an inner periphery of a cylindrical holder118integrally provided on the body bracket116. A motor3(drive unit) is arranged beneath the rotation support shaft217. A pulley312integrally provided on the motor shaft311and a pulley313integrally provided on the rotation support shaft217are connected together via a transmission belt314. In this way it is possible to rotate the treatment chamber2in response to drive of the motor3and to impart centrifugal force to the powder particles inside.

The bag filter5is formed from a cylindrical mesh plate, and is fitted between a disk-shaped rear plate512, having an opening section at a middle part, and a disc shaped front plate513having a central part formed in a U-shape, that are caused to face each other with a specified distance between them. The rear plate512and the front plate513are connected using butterfly bolts514provided in the middle, and it is possible to attach and detach the front plate513and the bag filter5by tightening or loosening the bolts514. The configuration of the bag filter5is such that it is arranged a specified distance from the dispersion plate212, and an arrangement proportion inside the treatment chamber2is wider than the surface width of the dispersion plate212or larger than the surface area of the dispersion plate212, with gas that has flowed into the treatment chamber2through the dispersion plate212being discharged through the bag filter5.

The bag filter5can be appropriately replaced with one of a different hole diameter or material depending on the particle diameter of the powder particles to be processed, and as well as material that is the same as that used for the dispersion plate212, it is possible to form the filter cylindrically using a retainer and bag-shaped bag cloth (woven or non-woven fabric) formed from various materials for covering the retainer, or alternatively to form the bag filter5in a bellows shape in order to ensure surface area.

A cylindrical discharge pipe511extending rearwards is integrally connected to a central opening part of the rear plate512, and gas discharged from the treatment chamber2to the bag filter5is discharged outside of the apparatus (outside the system) via the discharge pipe511. The discharge pipe511is rotatably supported at the inner periphery of the rotation support shaft217.

A backwash nozzle, not shown, is provided inside the bag filter5, and compressed gas is instantaneously or intermittently sprayed to peel away particulate matter that has become attached to the bag filter5, and returned to the dispersion plate212side. Utilizing the structure where the bag filter5uses a retainer and bag-shaped bag cloth for covering the retainer, it is possible to instantaneously inflate the bag cloth using compressed gas to cause the powder particles to fly off.

A pair of support shafts116a,116bare respectively attached to attachment surfaces formed on left and right sides of the body bracket116. The body bracket116is fitted by rotatably pivoting to the frame7via these support shafts116a,116b. The frame7is formed substantially in a U-shape in front view, so that various equipment (not shown) is housed in the bottom section721and left and right upright side sections722,723, and the upright side sections722and723constitute support sections (support frames) for pivoting the support shafts116aand116b. The casing body1is then capable of rotation upwards and downwards in the U-shaped space. A gas supply device containing a blower and a heater etc. is provided inside the bottom section721. An operation control device is equipped inside the upright side section722, for controlling various drives, such as the motor for causing upward and downward rotation of the casing body1using the operation panel722a, and a control panel for controlling centrifugal and centripetal force on the powder particles inside the treatment chamber2. A collection bag filter62for collecting powder particles that have passed through the bag filter5and been discharged outside the system from the discharge pipe511via the piping hose511ais fitted inside the upright side section723.

The support shaft116bis tubular, and the inside of this tube is used for housing a gas supply tube connecting the gas supply device and the gas supply chamber131, to pass wiring to the motor3, etc. therethrough, and to connect various devices at the casing1and frame7side.

In this manner, the casing1is constructed capable of varying rotation of a rotation shaft of the treatment chamber2from above to below, and it can be used in either case of a vertical type where the rotation shaft of the treatment chamber2is vertical, or a horizontal type where the rotation shaft is horizontal. In this apparatus, powder particles are introduced with the opening section112aof the casing1facing upwards (rotation axis in the vertical direction), as shown in FIG.16(A), the powder particles are processed with the opening section112afacing sideways as shown inFIG. 15(rotation axis in the horizontal direction), and powder particles are removed with the opening section112afacing downwards (rotation axis in the vertical direction), as shown in FIG.16(B).

Next, a description will be given of a method of carrying out drying treatment while mixing and granulating powder particles, for the apparatus having this type of structure. In introducing a constant amount of powder particles into the treatment chamber2, first of all the outer cover12and the inner cover216are opened with the opening section of the casing1sloping upwards, a constant amount of powder particles is introduced into the treatment chamber2and the outer cover12and the inner cover216are closed. After that, the orientation of the casing1is changed to a lateral manner, centrifugal force is applied to the powder particles by causing rotation of the treatment chamber2by driving the motor3, and the powder particles accumulate uniformly on the inner wall surface of the circumferential plate212. On the other hand, heated air that has been guided to the inflow215is made to flow to the inside of the treatment chamber2through the circumferential plate212to cause dispersive fluidization of the powder particles by subjecting them to centripetal force, and forming a fluidized bed.

By providing a material supply discharge pipe inside the discharge pipe511, it is possible to operate continuously, and if powder particles are introduced via the supply discharge pipe while rotating the treatment chamber2it is possible to simply introduce a specified amount of powder particles in a short time. By causing compressed air to flow inside the treatment chamber2using the granulation nozzle4, as required, it is possible to smoothly form a fluidized bed and it is also possible to form a powder layer of uniform thickness in an extremely short time.

Here, inside the treatment chamber2, although only slight, the wind velocity is faster at the inner side of the powder particle layer (axial direction), while centrifugal force acting on the powder particles is smaller, which means that fluidization commences from the powder layer surface. As a result, even if the speed of rotation of the treatment chamber2is constant, by varying an amount of heated air supplied it is possible to form a fixed bed where the powder particles are not fluidized, a partially fluidized bed and a completely fluidized bed, as described in Japanese Patent Laid-open No, 2002-119843.

In a third embodiment of the present invention having this type of structure, a fluidized bed of powder particles is formed by gas flowing into a cylindrical treatment chamber2from a circumferential surface region, and mixing, granulation and drying treatment is carried out. At this time, at a dispersion plate (circumferential plate)212side, as ventilation means, being the outermost section of the treatment chamber2, and at a bag filter5side at a central section, the flow rate is faster at the central side, as result of which it becomes easier for finer particles accompanying the gas flow to move to the central section and a phenomenon arises where it is difficult for the moved particles to return to the circumferential surface region. Also, when blockage of the bag filter5occurs discharge efficiency becomes bad and there is a danger of pressure drop and the balance between centrifugal force and centripetal force collapsing.

However, the bag filter5provided in the treatment chamber2of this apparatus has an arrangement proportion inside the treatment chamber2that is wider than the surface region width of the dispersion plate212forming the outer surface region, or larger than the surface area of the dispersion plate212.

In this way, gas that has flowed into the treatment chamber2can cause discharge rate to be slowed at an axial region inside the treatment chamber2where centrifugal force is weak and discharge rate is fast, efficient discharge of airflow is obtained while balancing centripetal force and centrifugal force on the powder particles regardless of the particle diameter, uneven gas flow is avoided and it is possible to carry out drive control for optimum inflow and discharge of gas for fluidized bed behavior. Further, it can be planned to improve product collection rate by reducing the amount of powder particles attaching to the bag filter5accompanying airflow, and amount of powder particles discharged by passing through from the bag filter, and it is further possible to improve control characteristics for powder particles inside the treatment chamber2such as being able to form a good fluidized bed by exerting forces in opposing directions, namely centrifugal force and centripetal force, in a well balanced manner. Also, it is possible to carry out an adjustment operation for the balance between the centrifugal force and centripetal force extremely easily using control means, and it is possible to plan to improves processing efficiency by reliably processing fine powder particles in the micron and sub micron range.

The arrangement proportion of the dispersion plate212and the bag filter5inside the treatment chamber2is realized by forming the treatment chamber2in a truncated cone shape. That is, a large overall central region that is set is effectively utilized and makes the arrangement region for the bag filer5by forming an upright section221athat is upright and has an arbitrary height and width from a dispersion plate212side, and an inclined region221bextending towards the rear from the upright section221a, with respect to an axial direction of the treatment chamber2. As a result, with respect to powder particles at an axial region side inside the treatment chamber2where centrifugal force is weak, by slowing down flow rate at the inclined section together with discharge action to the discharge pipe511side to weaken centripetal force, even if there is attachment to the bag filter5, it is possible to cause powder particles to move smoothly to the upright section221aside to form a fluidized bed, including powder particles that are made to fly off by a backwash nozzle.

The treatment chamber2of this embodiment has the rear fixed plate221formed in the shape of a truncated cone, but the shape of the treatment chamber2is not limiting. It is also possible to form the inner cover body216in a truncated cone shape, and also to form both the rear fixed plate221and inner cover body216in truncated cone shapes to give an overall diamond shape when viewed from the side.

By forming the inclined section221bfacing to the rear of the casing1(bracket116side), it is possible to smoothly move the powder particles to the upright section221aside and also to use a space appearing at the rear surface side of the inclined section221bas the air circulation path215to make the air circulation path215inside the casing1large, which makes it possible to increase the amount of heated air accumulated inside the air circulation path215(casing1), to make the pressure either side of the dispersion plate212much closer to equal, and to achieve uniform dispersive inflow inside the treatment chamber2.

By making the gas inflow means using the air inflow path215, formed between the casing1and the dispersion plate212, and the plurality of supply ports13being a specified distance from an inner wall forming the air flow path215, it is possible to cause air to flow in uniformly from the entire surface region of the dispersion plate212to the inside of the treatment chamber, without gas supplied to the air inflow path215circulating excessively. Also, because the supply ports13can be made small, it is possible to manufacture a supply structure without the gas supply path projecting to the exterior surface of the casing1. As a result, arrangement of the casing1and treatment chamber2and connection to the gas supply device can be optimized, the gas supply structure for the overall apparatus is simplified and manufacture is made easy.

Since the supply ports13are provided in the bracket116forming the inner wall of the inflow path215, it is possible to have gas supplied from the supply ports13flow out in a direction parallel to the dispersion plate212, direct outflow (blowing) to the dispersion plate212is avoided, it is possible to equalize pressure inside the inflow path215in a state where there is no circulation due to supply of heated air, and it is possible to make a circulation path due to circulation arising from rotation of the dispersion plate212.

The supply ports13can also be provided in the casing1forming the inner wall of the inflow path as well as in the bracket116, and naturally the inflow direction of the air is arbitrary.

Further, a donut shaped (annular) gas supply chamber131for distributing air from the gas supply device to each of the supply ports13,13. . . is provided next to the rear surface side of the supply ports13(bracket116), and the supply ports13are linked to this gas supply chamber131. Air supplied from the gas supply device is temporarily built up inside this gas supply chamber131and air can be supplied equally to each of the supply ports13,13. . . and discharged to the inside of the inflow path215. The gas supply chamber131can be arranged at a rear surface side of the bracket116together with the motor3and the discharge pipe511(gas discharge path) etc., arrangement of the casing1and the treatment chamber2and connection to the gas supply device is optimized, the gas supply structure for the apparatus overall is simplified and manufacture is easy.

The casing1is formed as a truncated cone shape with a substantially trapezoidal cross section so that the external profile facing forwards becomes small, which means that an inclined side surface section of the casing1forms an inclined inner wall constituting the inflow path215, and air supplied to the inside of the inflow path215from each of the supply ports13,13. . . can be discharged towards the inclined inner wall, it becomes possible to direct flow towards a circumferential surface region direction of the dispersion plate212, and it is possible to support uniform dispersive inflow to the inside of the treatment chamber2.

The frame7is formed having upright side sections722,723at the left and right and with a substantially U-shaped cross section overall in front view, and the treatment chamber2(casing1) is fitted into a U-shaped section of a space formed between the upright side sections722and723at the left and right, via support shafts116a,116bthat are orthogonal to a rotational axis. The upright side sections722,723constitute support sections (support frames) for axially supporting the support shafts116a,116bto secure a structure for supporting the treatment chamber2capable of rotating up and down, it is possible to vary the attitude of the treatment chamber2to be facing upwards, facing sideways or facing downwards, it becomes possible to carry out treatment utilizing a process to vary the attitude of the treatment chamber2, meaning varying inclination in a range of 0-90° conforming to respective operations such as introduction, processing and extraction of powder material, and it is possible to use either a vertical type or a horizontal type apparatus.

One of the support shafts116bis formed in a cylindrical shape, and the inside of this cylindrical support shaft116bconstitutes arrangement paths (arrangement piping) for a gas supply pipe linking the treatment chamber2and the frame7and wiring etc., which means that these supply pipes and wiring are not exposed to the outside, it is possible to completely remove any danger of damage such as inadvertent attachment of processing material to induce a reaction, and it is possible to plan to link to devices mounted inside the bottom section721of the frame7and inside the upright side sections722,723.

Inner and outer covers216and12capable of being opened and closed are provided at a front surface side of the treatment chamber2and a front surface side of the casing1, and because the inner cover216is constructed so as to be attached or removed by tightening or loosening bolts, while the outer cover12is hinged at an upper section (or it can be hinged at a lower section) and is constructed so as to slide stowed to the rear in an open state, it is possible to form respectively independent sections as a structure for closing the treatment chamber2inside the casing1, and as a result opening and closing and also sealing of the treatment chamber2can be made easy, and the opened outer cover12does not obstruct introduction or removal of powder particles, or varying of attitude upwards or downwards accompanying the introduction or removal of powder particles.

The inner cover216and the outer cover12are formed from transparent resin, which means that it is possible to control behavior of the powder particles while confirming the fluidization and processing states of the powder particles through observation.

FIELD OF INDUSTRIAL UTILIZATION

The present invention is a rotating fluidized bed apparatus for powder particle, the apparatus causing gas to flow in to a cylindrical treatment chamber2in which powder particles are introduced, via a porous circumferential faceplate212, and discharging gas that has flowed in to the treatment chamber2to the outside of the treatment chamber via a bag filter5, wherein a gas circulation path215is formed at the periphery of the treatment chamber2via the circumferential faceplate212, and the circumferential faceplate212has a structure enabling rotation around an axis. With this arrangement, it is possible to form a fluidized bed for controlling behavior of powder particles by having gas flow in from the outer side of the treatment chamber via the circumferential plate212to exert centripetal force on the powder particle, while exerting centrifugal force on the powder particles accompanying rotation of the circumferential plate212. It is therefore possible to carry out various treatments such as mixing, granulation, coating, drying or reaction even with powder particles that are in the micron or submicron range.

In the present invention, by making the arrangement proportion of the bag filter5inside the treatment chamber2wider than the surface width of the dispersion plate212or larger than the surface area of the dispersion plate212, it is possible to cause gas that has flowed into the treatment chamber2to be discharged at a lower rate at an axial region inside the treatment chamber2where centrifugal force is weak and discharge rate is fast. Accordingly, it is possible to efficiently discharge gas that has been introduced into the treatment chamber while balancing centripetal force and centrifugal force on the powder particles regardless of the particle size, and it is possible to carry out optimal operation control of introduction and discharge of gas for fluidized bed behavior. It is also possible to plan for improved product collection rate by reducing the amount of powder particles sticking to a bag filter accompanying gas flow, and reducing the amount of discharge through the bag filter.

With the present invention, the gas introduction means comprises a gas introduction path215formed between a casing1and ventilation means212, and a plurality of supply ports13provided at specified intervals on an inner wall forming the gas inflow path215. In this way, it is possible to cause gas to flow in uniformly from the entire surface region of the ventilation means212to the inside of the treatment chamber2, without gas supplied to the gas inflow means being circulated excessively. Also, because the supply ports13can be made small, it is possible to manufacture a gas supply structure without the gas supply path projecting to the exterior surface of the casing1. As a result, arrangement of the gas inflow means, and casing1and treatment chamber2, and connection of the gas inflow means and the gas supply device can be optimized, the gas supply structure for the overall apparatus is simplified and manufacture is made easy.