JPH0318927B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is applicable to processing of powder and granular materials, such as mixing powder and granular materials, adding liquid to powder and stirring, and adding liquid to powder. In addition, the present invention relates to a powder processing device that performs granulation and coats granular materials with a coating agent.

[Conventional technology]

Some typical examples of conventional powder processing equipment will be explained below.

FIG. 6 is a schematic diagram showing an example of a conventional blender. This is called a V-shaped blender, and when raw material powder is put into a V-shaped processing tank 2 and the rotating shaft 3 is rotated, for example, as shown by arrow A, the raw material inside will be mixed as shown by arrow B, for example. They move together and mix with each other.

FIG. 7 is a schematic diagram showing an example of a conventional mixer. In this mixer, blades 6 are housed in a processing tank 4. Raw material powder or, in some cases, liquid is placed in the processing tank 4, and the blades 6 are moved by a rotating shaft 10, for example. When it is rotated in the direction of arrow C, the raw materials inside move as shown in arrow D, for example, and are stirred and mixed together. In that case, the rotating shaft 10
Sealing air 12 for sealing is blown into the portion where the gas is penetrated. 8 is a bearing.

FIG. 8 is a schematic diagram showing an example of a conventional granulator. In this granulator, a bottom plate 16 of a processing tank 14 is made rotatable. Raw material powder, water, binder, etc. are put into the processing tank 14, and the bottom plate 16 is rotated by a rotating shaft 20, for example, by arrow E. When rotated as shown, the raw material inside moves as shown by arrow F, for example, and becomes round particles. Furthermore, when a coating agent is sprinkled on top of this, the surface of the grains is coated with it. In that case, sealing air 12 for sealing is blown into the gap between the processing tank 14 and the bottom plate 16. 18 is a bearing.

[Problem that the invention seeks to solve]

Each of the devices described above has its own problems. For example, in a blender as shown in FIG. 6, there are problems such as poor mixing performance because rotational motion cannot be imparted to the raw materials inside.

In addition, in the mixer shown in Fig. 7,
There are problems such as raw materials having a high specific gravity tend to accumulate on the outside of the blades 6 and mixing of ultrafine powder is impossible. That is, with the progress and development of powder processing technology in recent years, powders with a particle size of less than 1 to 0.5 μm have appeared, but when such ultrafine powders are stirred with the blade 6 as described above, they are They float in the internal space and become floating dust, making stirring and mixing impossible. Furthermore, the sealing air 12 is blown from the bearing 8, which further exacerbates the above problem. Furthermore, the sealed air 12 inevitably contains minute foreign matter (for example, oil vapor, etc.) that cannot be filtered by a filter, and there is also the problem that this foreign matter mixes into the raw material powder.

On the other hand, in the granulator shown in Figure 8,
Regarding the sealing air 12, in addition to the same problems as above, since the granulation action area is limited to the periphery of the bottom plate 16, there is a problem that the processing efficiency is poor and the processing takes time. The same applies to coatings. Furthermore, since the grains located at the center of movement as indicated by arrow F do not grow much, there is also the problem that the grain sizes become uneven.

Furthermore, a problem common to all of the above-mentioned apparatuses is that separate apparatuses must be used for each processing step such as mixing, stirring, and granulating powder and granules.

Therefore, an object of the present invention is to provide a powder processing apparatus that solves the above-mentioned problems.

[Means for solving problems]

A first powder processing apparatus of the present invention includes a generally cylindrical support frame having an inner circumferential surface with a V-shaped cross section, and a generally cylindrical support frame having an outer circumferential surface with a V-shaped cross section corresponding to the V-shape of the support frame. A floating frame rotatably incorporated into the support frame with a gap left between the outer circumference and the inner circumference of the support frame, and two diagonal inner circumferences forming the inner circumference of the support frame. are provided on each side,
an air inlet for floating the floating frame within the support frame by blowing compressed air supplied from the outside into the gap; an induction electric means provided along the line; a processing tank that stores raw materials and is rotationally driven by the floating frame; a support means that rotatably supports the support frame; It is characterized by comprising a rotation drive means for rotating the support frame.

Simply put, the second granular material processing apparatus of the present invention is characterized in that the processing tank of the first granular material processing apparatus is provided with one more axis of freedom.

[Effect]

In the first powder processing device, the processing tank is
It is rotated by the rotary frame, and the rotary frame is also rotated by the rotary drive means in a direction perpendicular to the direction of rotation. Thereby, various types of processing can be performed on the powder and granular material in the processing tank.

In the second granular material processing device, the processing tank is
Furthermore, it is rotated in a direction perpendicular to the above two directions. Thereby, various types of processing of the powder and granular material in the processing tank can be performed more precisely.

〔Example〕

FIG. 1 is a schematic vertical sectional view showing a powder processing apparatus according to an embodiment of the present invention. Note that the cross section in the - direction in this figure is almost the same as that in FIG. 4, so please refer to it.

The powder and granular material processing apparatus of this embodiment includes a generally cylindrical support frame 22 having an inner peripheral surface 24 that is open inward and has a V-shaped cross section, and an outer peripheral surface 34 that has a V-shaped cross section corresponding to the V-shape of the support frame 22. The outer circumferential surface 34 and the inner circumferential surface 2 of the support frame 22 are generally cylindrical.
4 and a floating frame 32 rotatably incorporated within the support frame 22 with a gap 30 left between them.

The support frame 22 is connected to the base 64 by means of support means, that is, via rotation shafts 50a, 50b provided on both sides thereof and bearings 52a, 52b for receiving them.
It is rotatably supported by struts 62a and 62b provided above. A motor 58 serving as rotation driving means for rotating the rotation shaft 50b, that is, the support frame 22, is supported by the support column 62b.

The two oblique inner circumferential surfaces 24a and 24b forming the inner circumferential surface 24 of the support frame 22 are filled with compressed air supplied from the outside into the gap 30 over the entire circumference thereof. Air inlet 26 for floating the floating frame 32 within the support frame 22
a, 26b are formed. The air blowing ports 26a, 26b may be a plurality of small holes arranged in a row, or may be thin ring-shaped slits.

The air inlets 26a, 26b are connected to the support frame 2.
It communicates with two ventilation passages 28a and 28b, which are also formed in the interior of 2 and extend around the entire circumference. The ventilation passages 28a, 28b communicate with a ventilation hole 54 provided in the rotating shaft 50a.
4 is supplied with compressed air 56 from a compressed air source such as a compressor or a blower (not shown).

On the other hand, an electric induction means 40 is provided from the support frame 22 to the floating frame 32. That is, the stator core 42 and the stator winding 43 are provided along the valley portion of the inner circumferential surface 24 of the support frame 22.
A stator 44 of the induction motor means 40 is formed by these. On the other hand, the outer peripheral surface 34 of the floating frame 32
A rotor core 45 having a copper plating layer 46 formed on its surface is provided along the vicinity of the valley, and a rotor 47 of the induction motor means 40 is formed by these. The stator winding 43 includes a rotating shaft 5
AC power is supplied from a power source (not shown) through a slip ring device 60 provided at 0b.

In this example, a processing tank 36 that stores raw materials such as powder and granules and is rotationally driven by the floating frame 32 is provided so that the floating frame 32 forms a part thereof. The processing tank 36 has an opening 37 through which raw materials and the like are taken in and taken out. A lid 38 is provided there as necessary.

An example of the operation of the above powder processing apparatus will be explained. Compressed air 56 is supplied to a vent 54 provided on the rotating shaft 50a.
When the compressed air 56 is blown into the support frame 22, the compressed air 56 is uniformly distributed within the ventilation passages 28a and 28b within the support frame 22, and
Air inlet 26 provided on the inner circumferential surface 24 of 2
There is a gap 30 uniformly from a, 26b to the entire circumference.
It is forcefully blown inside. As a result, a well-balanced force is applied to the outer circumferential surface 34 of the flotation frame 32, and the flotation frame 32 and eventually the processing tank 36 are moved to the support frame 22.
float inside.

When the induction electric means 40 is operated in this state, the floating frame 32 and the processing tank 36 rotate as indicated by arrow H, for example.

When the motor 58 is operated at the same time, the support frame 22
The processing tank 36 rotating therein is rotated, for example, as indicated by arrow I. Furthermore, motor 5
8 may be of a reversible type, in which case the processing tank 36 can be rotated in the direction of arrow H and rotated by a predetermined angle in the direction of arrow I and its opposite direction, that is, oscillated. .

In this case, since normal motors, bearings, etc. are not used to drive the flotation frame 32 and the processing tank 36 to rotate in the direction of the arrow H and to support them, the mass distribution of the rotating parts is uniform, and the processing tank 36 is Or, it can be rotated or swung in the forward and reverse directions very smoothly. In addition, processing tank 3
Since no protruding parts such as motors or bearings are attached to 6, the processing tank 36 can be rotated or swung in the direction of arrow I or its reverse direction in a small space. These effects are even more effective in the case of three axes of freedom as illustrated in FIG.

If we consider the movement of raw materials when they are put into the processing tank 36 of the above-mentioned powder and granular material processing equipment and mixed, for example, as shown in Fig. 2, at first the processing starts. Due to the rotation of the tank 36 as shown by arrow H (see Figure 1), the raw material moving in a great circle as shown by arrow J in a plane orthogonal to gravity G is A, and the processing tank 36 is moving as shown by arrow I ( When the treatment tank 36 is rotated 90 degrees in the direction shown in FIG. Furthermore, when the processing tank 36 is rotated 90 degrees in the direction of arrow I and turned upside down, the raw material is transferred to the processing tank 3.
6, C moves in a great circle in the opposite direction to A in the plane perpendicular to gravity G, as shown by arrow L. When the processing tank 36 further rotates 90 degrees in the direction of the arrow I, the raw material is rotated as shown by the arrow H of the processing tank 36 and due to gravity, the raw material is moved in the plane along the gravity G as shown by the arrow M, which is opposite to the case of B. Move in a small circle in the direction D.

In other words, if the processing tank 36 is continuously rotated with two degrees of freedom as shown by arrows H and I in FIG.
The raw material in the processing tank 36 sequentially repeats the movements shown in A to D in FIG. As a result, the raw materials in the processing tank 36 are mixed. Furthermore, since the raw materials in the processing tank 36 are mixed while sequentially changing the magnitude and direction of their rotational movement, even if materials with high specific gravity tend to accumulate under gravity or outside centrifugal force, they will not stay in a fixed place. As a result, even raw materials with a large difference in specific gravity can be mixed homogeneously.

Moreover, since the area of action on the raw materials covers almost the entire inner surface of the processing tank 36, the area of action becomes large and the raw materials can be mixed efficiently.

Furthermore, since the blades 6 are not used as in the apparatus shown in FIG. 7, even when ultrafine powder is mixed, it does not occur that the particles float in the space like floating dust and are not mixed.

Furthermore, since the inside of the processing tank 36 can be sealed, there is no fear that the sealing air 12 will promote the floating of the ultrafine powder inside or that foreign matter will be mixed into the raw material, unlike in the prior art. If necessary, the treatment tank 36
Processing can also be carried out by creating a special atmosphere inside and filling it with, for example, an inert gas.

Furthermore, since the processed product can be taken out while rotating in the direction of arrow H with the opening 37 of the processing tank 36 facing downward, the time required to take out the product is shortened and the product remains in the processing tank 36. There is little possibility.

Similarly, in the processing tank 36, it is also possible to add a liquid to the powder and stir it, add a liquid or a binder to the powder and granulate it, or coat the granule with a coating agent. can.

Moreover, it is very economical because a plurality of processes of powder and granule processing such as mixing, stirring, granulation, and coating can be carried out in one apparatus or in succession.

In that case, the rotational speed of the processing tank 36 as indicated by arrows H and I, and whether the processing tank 36 should be rotated halfway in the direction of arrow I instead of being rotated completely, etc., are determined depending on the raw material to be processed and the like. It may be selected as appropriate depending on the processing content, etc.

For example, in the case of granulation, the processing tank 36 may not be rotated completely in the direction of arrow I, but may be reversed midway and oscillated. In this case, the movement of the raw material within the processing tank 36 is a combination of a great circular movement as shown by arrow J and a reciprocating movement as shown by arrow N, as shown in FIG. Due to this movement, the raw material gradually grows into round particles. Furthermore, if a coating agent is applied to a granular material, the coating film will gradually grow and become thicker.

In the case of the above-mentioned granulation and coating as well, since the action area is large, the processing efficiency is good, and the processing time can be shortened compared to the apparatus shown in FIG. 8.
In addition, since the grains in the processing tank 36 all roll in substantially the same manner over almost the entire bottom surface of the processing tank 36, products with uniform grain size and coating film thickness can be obtained.
Furthermore, when taking out the product, the time required to take it out is shortened, and there are fewer problems such as residue.

By the way, since the above-mentioned characteristic structure is adopted for supporting the processing tank 36 and rotating it as shown by the arrow H, it is easy to provide the processing tank 36 with three degrees of freedom. An example will be explained with reference to FIG.

Mainly to explain the difference from the example shown in FIG. 1, in this example, a third frame 66 is further provided outside the support frame 22 as described above, and this and the bearings 52a, 52b are used. Rotating shafts 50a and 50b attached to the support frame 22 are rotatably supported by the support frame 22, and the motor 58 is also supported by the frame 66.

Further, rotation shafts 68 provided on both sides of the frame 66
a, 68b are rotatably supported by bearings 70a, 70b attached to pillars (not shown) or the like. A second motor 76 that rotationally drives the rotating shaft 68a is supported by the above-mentioned support or the like.

The compressed air 56 is supplied to the vent 54 of the rotating shaft 50a via a vent 72 provided in the rotating shaft 68b and a ventilation path 74 provided in the frame 66. Furthermore, power is supplied to the slip ring device 60 via a slip ring device 78 provided on the rotating shaft 68a and an electric wire 80 extending along the frame 66.

In the above powder processing apparatus, the processing tank 36
In addition to being able to rotate in the direction of arrow H and arrow I or their forward and reverse directions as in the case of the apparatus shown in FIG. 1, the motor 76 can further rotate it in the direction of arrow O. Of course, the motor 76 may be of a reversible type similar to the motor 58, and in that case, the processing tank 36 can also be swung in the direction of the arrow O and its opposite direction.

Therefore, when the raw material powder is placed in the processing tank 36 of such an apparatus and the above-mentioned processing is performed,
As an example is shown in FIG. 5, the raw material in the processing tank 36 is subjected to a movement as shown by an arrow P in addition to the movement shown in FIG. 2 or 3. Therefore,
Compared to the apparatus shown in FIG. 1, it becomes possible to perform the above-described processing of powder and granules more finely, more uniformly, and in a shorter time.

In each of the above embodiments, the inner circumferential surface 24 of the support frame 22 and the outer circumferential surface 34 of the floating frame 32
The example is a case where the cross section is V-shaped and opens inward, but
On the contrary, they may also be V-shaped in cross-section and open outwards.

Furthermore, in the above embodiments, the floating frame 32 forms a part of the processing tank 36, but the floating frame 32 and the processing tank 36 may be separate bodies.

〔Effect of the invention〕

As described above, according to the present invention, processing of powder and granular materials, such as mixing, stirring, granulation, coating, etc., can be carried out efficiently, in a short time, and uniformly. Moreover, since the process can be carried out in a sealed state, problems such as foreign matter being mixed into the raw material caused by conventional sealing air blowing can be eliminated. In addition, the processed product can be completely removed from the processing tank in a short period of time. Furthermore, it is very economical because a plurality of processing steps can be performed in one device or in succession.

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical sectional view showing a powder processing apparatus according to an embodiment of the present invention. FIGS. 2 and 3 are diagrams for explaining the processing operation of the apparatus shown in FIG. 1, respectively. FIG. 4 is a schematic cross-sectional view showing a powder processing apparatus according to another embodiment of the present invention, and corresponds to the view taken in the line-direction of FIG. 1. FIG. 5 is a diagram for explaining the processing operation of the apparatus shown in FIG. 4. FIG. 6 is a schematic diagram showing an example of a conventional blender. FIG. 7 is a schematic diagram showing an example of a conventional mixer. FIG. 8 is a schematic diagram showing an example of a conventional granulator. 22... Support frame, 24... Inner peripheral surface, 26a, 2
6b...Air inlet, 30...Gap, 32...
Floating frame, 34... Outer peripheral surface, 36... Processing tank, 40
... Induction electric means, 44 ... Stator, 47 ... Rotor, 56 ... Compressed air, 58 ... First motor, 66 ... Third frame, 76 ... Second motor.

Claims (1)

[Scope of Claims] 1. A generally cylindrical support frame having an inner peripheral surface with a V-shaped cross section; and a generally cylindrical support frame having an outer peripheral surface with a V-shaped cross section corresponding to the V-shape of the support frame; A floating frame is rotatably built into the support frame with a gap left between the outer circumference and the inner circumference of the support frame, and a floating frame is provided on each of the two oblique inner circumferences forming the inner circumference of the support frame. an air inlet for levitating the levitation frame within the support frame by blowing compressed air supplied from the outside into the gap; an induction electric means provided along the frame; a processing tank that stores raw materials and is rotationally driven by the floating frame; a support means that rotatably supports the support frame; and a support means that rotatably supports the support frame; A granular material processing apparatus comprising: a rotation drive means for rotating the support frame. 2. A generally cylindrical support frame having an inner peripheral surface with a V-shaped cross section, and an outer peripheral surface with a V-shaped cross section corresponding to the V-shape of the support frame, where the outer peripheral surface and the support frame are in contact with each other. The floating frame is rotatably built into the support frame with a gap left between it and the inner circumferential surface, and the floating frame is provided on each of the two oblique inner circumferential surfaces that form the inner circumferential surface of the support frame, and is supplied from the outside. an air inlet for levitating the levitation frame within the support frame by blowing compressed air into the gap; a stator is provided along the support frame, and a rotor is provided along the levitation frame. a processing tank that stores raw materials and is rotationally driven by the floating frame; a third frame that rotatably supports the support frame; and with respect to the third frame. a first rotation drive means for rotating the support frame; a support means for rotatably supporting the third frame; and a second rotation drive means for rotating the third frame with respect to the support means. Powder processing equipment equipped with.