JP3996256B2 - Vibration treatment device for powder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vibration treatment device for granular material. In particular, it is an invention suitable as a vibration drying apparatus for granular materials.
[0002]
Here, the vibration heating drying apparatus for granular materials will be mainly described as an example, but the present invention is not limited to this. For example, the present invention can be applied to a vacuum drying apparatus, a freeze drying apparatus, a granulating apparatus, a reaction apparatus, a fermentation apparatus, and the like.
[0003]
In addition, the term “powder” is a concept that includes not only powders having a particle size of 0.1 μm or less in a narrow sense but also particles and granules exceeding 0.1 μm (“Chemical Engineering Dictionary” (See May 30, 1974) Maruzen, p415).
[0004]
[Background]
There existed the following as a drying apparatus used for the final process of the powdery medicine in the field of fine chemicals.
[0005]
A cylindrical processing container for charging and processing the powdery material to be dried is placed (horizontal) so that the axis is substantially horizontal, a rotary blade is provided inside the processing container, and heat is applied to the outer periphery of the cylindrical body. There is a type that includes a jut that allows a medium to flow, and is heated and dried by a heat medium that flows in a jacket in the course of stirring a granular material that is an object to be dried by a rotating blade.
[0006]
However, this drying apparatus has the following problems (see Japanese Patent Publication No. 55-37944).
[0007]
The gap between the rotary blade and the inner peripheral surface of the cylindrical processing container becomes a dead space, and it is difficult to sufficiently agitate the granular material, the granular material is locally heated, or the gap There was a risk of crushing and crushing the powder.
[0008]
Especially in the field of fine chemicals, when high purity is required for high-mix, low-volume production, that is, when you are extremely disliked by contamination of chemicals (so-called contamination), a machine such as a rotary blade is used. It is not desirable to have parts. That is, it is necessary to clean and remove other chemicals adhering to the corners and intersections such as the rotary shaft seal part and the rotary blades, which increases the number of cleaning steps.
[0009]
Therefore, the applicant of the present application first vigorously agitates the entire granular material without destroying the particles by vibrating the cylindrical processing container to make the granular material floating. Have been proposed and manufactured and sold (see claims and the like in the same publication).
[0010]
A continuous drying apparatus based on the same technical idea is described in Japanese Patent Publication No. 60-13742 / 63-63241.
[0011]
In batch-type drying apparatuses based on these same technical ideas, there is an increasing demand for further improvement in drying efficiency.
[0012]
As a means for improving the drying efficiency, it may be possible to provide a heat transfer fin or a single cylindrical member through which the heat medium flows (see Japanese Patent Publication No. 60-13742). However, it is not as desirable to deal with the above in the case of providing the rotary blades described above, but it is not desirable from the standpoint of cleaning the inside of the container at the time of batch change.
[0013]
In view of the above, an object of the present invention is to provide a vibration treatment device for a granular material capable of improving the mixing fluidity of the granular material without depending on the means for disposing a member therein. .
[0014]
Another object of the present invention is to provide a vibration drying apparatus for granular material that improves the mixing fluidity of the granular material and improves the drying efficiency without depending on the means for disposing the member inside. The purpose is to do.
[0015]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present inventors have made a cylindrical processing vessel arranged horizontally into a frustum cylindrical shape in the process of earnestly developing, and the processing vessel is mainly subjected to circular vibration around an axis. In addition, when elliptical vibration is generated, it has been found that good fluidity can be obtained and, in turn, drying efficiency can be improved.
[0016]
A cylindrical processing container placed on an elastic body so that an object to be processed, which is powdered or after being charged, is placed and the axis is substantially horizontal, and an oscillation that imparts vibration to the processing container In a vibration processing apparatus comprising a machine, the workpiece discharge port is a frustum cylinder having a large-diameter side end, and
The taper angle of the truncated cone (intersection angle with respect to the axis) is 5 ° to 30 ° .
[0017]
In the above-described configuration, it is desirable that the oscillator generate a circular vibration or an elliptic vibration mainly around the axis in the processing container, because the mixed fluidity of the powder is improved.
[0018]
In addition, it is desirable that the processing container has a temperature control means on the peripheral wall because the versatility of the apparatus is increased.
[0019]
Further, it is desirable that the processing vessel has an intermediate bulging double frustoconical shape and that both ends are formed by end plates because the mixing fluidity of the powder particles is further improved.
[0020]
And in the said vibration treatment apparatus for granular materials, if an exhaust port is formed in the said processing container, it will become a vibration drying apparatus for granular materials.
[0021]
Furthermore, drying efficiency can be improved by connecting a vacuum suction means to the exhaust port.
[0022]
[Operation and effect of the invention]
As shown in FIGS. 1 (a) and 1 (b), the vibration processing apparatus for granular material according to the present invention is one in which the granular material P is put into the processing container 12 or becomes a granular material after being charged. It is charged so that the apparent volume of 12 is about 60 vol% or more. Then, vibration is applied to the processing container 12 by an oscillator. At this time, the vibration generated in the processing container usually includes an elliptical or circular vibration around the axis L (see arrow in FIG. 1A). Then, the apparent cross section of the granular material has a shape as shown by a two-dot chain line W1 in FIG. And on the small diameter side, the granular material is relatively easy to receive vibrational energy relatively, and the kinetic energy of each particle on the small diameter side (end side) increases as compared with the large diameter side. For this reason, as shown by a two-dot chain line W2 in FIG. Then, a force acts in a direction to attenuate the bulge, and the granular material moves to the large diameter side, and the granular material on the bottom side also moves to the large diameter side due to gravity, and the two in FIG. As shown by the dotted line W3, the large diameter side rises. Then, a reaction from the wall surface on the large diameter side occurs, and this time, on the contrary, the reaction moves to the small diameter side, and the small diameter side rises as shown by a two-dot chain line W2 in FIG. As described above, in the granular material, a swell motion similar to the tide fullness reciprocating in the axial direction is generated along with the rotational motion around the axis of the processing container.
[0023]
Accordingly, the mixing fluidity of the powder particles is increased, and naturally, when used as a drying apparatus, the drying efficiency is also increased.
[0024]
In the configuration in which only the bottom surface is inclined toward the processed product discharge port as disclosed in JP-A-6-307764, the diameter opposite is not formed on the side opposite to the processed product discharge port side. Can not expect.
[0025]
As a matter of course, the effect is remarkable when circular vibration or elliptic vibration around the axis is generated in the processing container.
[0026]
Further, by adopting a configuration in which the processing container has an intermediate bulging double frustoconical shape and both ends are formed of end plates, there is no corner, and the swell movement reciprocating in the axial direction can be performed more smoothly. Further, as a secondary matter, cleaning at the time of changing the object to be processed is further facilitated, and the discharge of the processed material from the processing container is quick and smooth.
[0027]
Further, when an exhaust port is formed in the processing container and a vacuum suction means is connected to the exhaust port as necessary, it can be suitably used as a vibration drying apparatus for powder.
[0028]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0029]
(1) FIGS. 2-4 shows an example of the horizontal vibration heating drying apparatus which shows one Embodiment of this invention.
[0030]
The basic configuration of this apparatus is a cylindrical processing container 12 that is placed on an elastic body 14 so that an object to be processed that is powdered or powdered is charged and the axis L is substantially horizontal, An oscillator (driving means) 16 for applying vibration to the processing container 12 is provided.
[0031]
Here, the powder and granular material after charging, as disclosed in Japanese Examined Patent Publication No. 63-63241, is a liquid (including mud) containing a solute and dried (solvent volatilization) to become powder and granular material. In some cases, the liquid body reacts and further freezes to become a granule, and further includes the case where the powder becomes a granule by a granulating action.
[0032]
Here, the insertion port 18 is formed on the ceiling wall side. The position of the insertion port 18 is not limited to this, and any position such as the upper part of the wall surfaces at both ends can be used as long as it is a position where powder particles can be charged. The size of the inlet is, for example, 8 to 10 cm in opening diameter when the capacity of the processing container 12 is 1000L. Hereinafter, the design specifications of the processing container 12 and the like are specifications when the capacity of the processing container 12 is 1000 L unless otherwise specified.
[0033]
The elastic body 14 is a coil spring, is disposed on the support column 32 a of the gantry 32, and supports the processing container 12 via the bracket 34. The elastic body is not particularly limited as long as it is elastic and strong enough to absorb vibrations applied to the processing container 12.
[0034]
As such an elastic body, a leaf spring, an air spring, a rubber-like elastic body, or the like can be used. In the case of a coil spring, it is desirable to wrap the coil spring with an elastomer material because it can utilize the damping performance of rubber-like elasticity in addition to spring elasticity.
[0035]
In the illustrated example, the oscillator 16 is a mechanical type in which an oscillating portion 24 having unbalanced weights 22 arranged on both sides is rotated by a prime mover (motor) 28 via a universal joint 26. Depending on the amount of processing, the required frequency, and the type of vibration, not only a mechanical system but also an electromagnet system and a vibration motor system can be used alone or in combination with a mechanical system if necessary. The oscillator 16 and the processing container 12 are connected by attaching the oscillating portion 24 of the oscillator 16 to the downwardly extending portion 34 a of the bracket 34.
[0036]
At this time, in order to improve the effect of the present invention (mixed fluidity of the granular material) reliably, the vibration applied to the processing container 12 is mainly to provide circular vibration or elliptic vibration around the axis. desirable. The type of vibration may be vertical or diagonal linear vibration, or horizontal straight line or circular / elliptical vibration.
[0037]
Furthermore, the mounting position of the oscillator 16 is usually set to be substantially directly below the processing container 12. As shown in FIG. 5, the oscillator 16 may also be provided on one side of the processing container 12 at the height of the axis L and in the laterally extending portion 34 b of the bracket 34. In this case, it is necessary to arrange the balance weight 17 on the opposite side. As compared with the case where the oscillator 16 is arranged directly under the processing container 12, the circular vibration can be applied to the processing container 12 with more energy efficiency.
[0038]
Furthermore, a pair of oscillators 16 may be provided on both sides of the processing container 12, and the cleaning property or the like is hindered, but may be provided at the axial center position of the processing container 12.
[0039]
The frequency and vibration pitch vary depending on the processing procedure and required mixing fluidity. For example, when used for powder heating and drying, the vibration frequency is 500 to 1800 cpm, and the vibration pitch is 10 to 0.5 mm. To do. Here, the vibration pitch is usually set smaller than the increase in the frequency.
[0040]
The temperature adjusting means is a jacket 30 that is piped so as to be able to pass a heat medium such as superheated steam or refrigerant. Although the position of the steam inlet 31 to the jacket is not particularly limited, in the present embodiment, the steam inlet 31 is provided in a peripheral wall portion of a dust collecting cylinder portion 38 to be described later. The temperature control means is not limited to this, and a coil for resistance heating and induction heating is wound around the processing vessel 12, or a microwave oscillator is attached to the ceiling and used in combination with microwave heating. A chemical reaction heating element may be wound around the processing container.
[0041]
Since this processing container is a drying device, it includes an exhaust port 36. Specifically, in order to prevent leakage of powder (dust) to the outside of the processing system, an exhaust port 36 is formed through a dust collecting cylinder portion 38 formed in the center of the ceiling side of the processing container 12.
[0042]
The dust collecting cylinder portion 38 has a configuration in which a plurality of bag filters 42 are suspended from a holding plate 40 at an intermediate height position. The inner diameter of the dust collecting cylinder portion 38 is 40 to 50 cm. The exhaust port 36 can be connected to a vacuum suction means (not shown) such as a vacuum pump or a compressor, although it is not inevitable if the dust collecting cylinder portion 38 is not interposed. At this time, the vacuum suction capacity is such that a suction capacity of 1 to 1.5 Nm ³ / min or a vacuum degree of 5 to 10 Torr (0.5 to 1 kPa) in absolute pressure in the processing container 12 is obtained.
And
[0043]
(2) The processing container 12 of the present embodiment is provided with at least one processed product discharge port 44 substantially immediately below the axis L in the above, and the processed product discharge port 44 at the large-diameter side end. It is a characteristic requirement to have a truncated cone shape.
[0044]
Here, the reason why the processed product discharge port 44 is formed at the end on the large diameter side is to facilitate discharge of the processed product.
[0045]
In the illustrated example, the processing container 12 has an intermediate bulging double frustoconical shape, and both ends are formed of end plates. The processed product discharge port 44 is formed by a bellows hose 48 via a discharge valve 46. By adopting the two-point frustoconical shape, the processing capacity can be increased, and the processed material can be discharged from the discharge port more quickly and smoothly.
[0046]
Moreover, by forming both ends with the end plate 12a, the corners are not formed, and the mixed fluidity is improved. This can be said even when both ends of a single truncated cone as shown in FIG.
[0047]
At this time, the taper angle of the frustoconical shape (intersection angle with respect to the axis) depends on the capacity of the processing vessel 12 (that is, the average diameter and length of the frustoconical shape), but is 5 ° to 40 °, preferably 10 ° to 30 °. If the taper angle is too small or too large, the improvement of the mixing fluidity of the present invention cannot be expected, and the discharge rate (discharge property) from the discharge port also decreases.
[0048]
The average diameter (center diameter) and length (height) of the truncated cone are usually the former: 75 to 120 cm and the latter: 120 to 75 cm.
[0049]
Here, the description has been made by taking the double frustoconical shape as shown in FIGS. 2 to 5 as an example. However, a configuration in which two double frustoconical shapes as shown in FIG. The frustoconical shape and the like, and the frustum shape is not limited to a cone, but may be a polygonal frustum shape (hexagonal frustum shape or the like), and the number and method of connection of the frustoconical shape are arbitrary as long as the effects and effects of the invention are exhibited.
[0050]
Further, it is not inevitable, the mixed fluidity is alienated, and the cleaning workability may be hindered. However, if necessary, the heat transfer fins 50 may be provided as shown in the figure.
[0051]
In the illustrated example, 52 is a manhole for cleaning and the like, and 54 is a viewing window for checking the inside.
[0052]
(3) Next, the usage mode of the horizontal vibration drying apparatus will be described.
[0053]
First, 50 to 80% by volume, preferably 60 to 70% by volume, of the capacity of the processing container 12 is charged from the input port 18. If the input amount is too small, it is difficult to obtain the effect of improving the mixing fluidity of the present invention due to the frustum shape. Further, the diameter of the powder is 1 μm to 5 mm, preferably about 0.1 to 1 mm, and the effect of improving the mixing fluidity is easily obtained. From the standpoint of improving mixed fluidity, it is desirable that the powder has a true specific gravity of 0.5 to 10, and preferably 0.8 to 2.
[0054]
Next, the motor 28 is started to drive the oscillator 16 to apply vibration to the processing container 12, and steam (pressurized / depressurized) at a predetermined temperature is caused to flow into the jacket 30 through the steam inlet 31. In order to maintain a predetermined temperature, a pipe provided with a drain valve (not shown) that opens and closes at a predetermined pressure is connected to the jacket 30 via a bellows hose or the like. Depending on the material of the processing object (powder), the steam may be passed before the processing object is charged to heat the processing container 12. Moreover, you may use warm water instead of steam.
[0055]
Although the driving horsepower of the oscillator varies depending on the amount of processing, for example, 5.5 to 7.5 kW, and the driving specification of the oscillator 16 varies depending on the type of powder (particle size / specific gravity) and the filling amount. As described above, the vibration frequency is 500 to 1800 cpm and the vibration pitch is 0.5 to 10 mm. At the same time, the vacuum pump is operated to perform vacuum suction and continue the drying process.
[0056]
Then, as shown in FIG. 7, the temperature and vacuum pressure of the processing object change, the processing object temperature becomes asymptotically parallel to the heating temperature, and the degree of vacuum in the processing container 12 is reduced by the vacuum pump (vacuum suction means). When it becomes asymptotically parallel to the capacity, the operation is stopped, that is, the oscillator and the vacuum pump are stopped, and the steam valve is closed if necessary.
[0057]
At this time, the processed material in the processing container 12 has a good mixing fluidity as described above, and thus is quickly and efficiently dried.
[0058]
Then, after the operation is stopped, the discharge valve 46 is opened, and the processed product (dried product) is discharged from the discharge port 44. At this time, by starting the oscillator 16 and applying vibration to the processing container 12, the dried product can be easily discharged. The frequency at the time of discharging the processed material may be a relatively smaller output / pitch and rotation speed than that at the time of the drying process. At this time, for example, the vibration frequency is 1500 to 300 cpm and the vibration pitch is 0.5 to 10 mm.
[0059]
Further, the vibration type may be a circular / elliptical vibration, but is not limited as long as the vibration type acts to promote the fall of the powder on the frustum-shaped slope. In this case, it is conceivable to attach a discharge oscillator different from the mixing oscillator for the drying process to the processing container.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing the mixing fluidity of powder particles in a processing container in the vibration processing apparatus of the present invention. FIG. 2 is a schematic plan view of a horizontal vibration dryer in one embodiment of the present invention. FIG. 4 is a schematic cross-sectional side view of the same. FIG. 4 is a schematic front view of the same. FIG. Fig. 7 is a schematic side cross-sectional view of an embodiment of the present invention. Fig. 7 is a conceptual diagram of drying when a processed product is dried using the processing apparatus of the present invention.
12 Processing container 14 Elastic body (coil spring)
16 Oscillator 30 Temperature control means (jacket)
36 Exhaust port 38 Dust collection cylinder 44 Processed product discharge port

Claims (7)

A cylindrical processing container placed on an elastic body so that an object to be processed, which is powdered or after being charged, is placed and the axis is substantially horizontal, and an oscillation that imparts vibration to the processing container In a vibration processing apparatus comprising a machine,
The processing container is provided with at least one processed product discharge port substantially directly below the axis, and has a truncated cone shape having the processing object discharge port at a large-diameter end ,
The powdery-body vibration processing apparatus, wherein the frustum cylindrical taper angle (intersection angle with respect to the axis) is 5 ° to 30 ° .   2. The vibration treatment apparatus for a granular material according to claim 1, wherein the oscillator mainly imparts circular vibration or elliptic vibration around an axis to the processing container. The vibration processing apparatus for a granular material according to claim 1 or 2, wherein the processing container includes a temperature adjusting means on a peripheral wall .  4. The vibration treatment apparatus for a granular material according to claim 3, wherein the processing container is formed as an intermediate bulging double frustoconical shape and both ends are formed of end plates.  The vibration processing apparatus for a granular material according to claim 1 or 2, wherein the processing container is formed in an intermediate bulging double truncated cone shape and both ends are formed of end plates.  6. The vibration drying apparatus for granular material according to claim 1, wherein the processing container includes an exhaust port.  The vibration drying apparatus for granular materials according to claim 6, wherein a vacuum suction means is connected to the exhaust port.

Images