JP3057202B2 - Granulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a granulator for producing a granular material comprising an inorganic powder having an irregular cross section.

[0002]

2. Description of the Related Art Conventionally, in order to produce an artificial lightweight aggregate having a specific gravity of 1 or less, a foamed inorganic substance such as shale, clay, coal ash, and slate is used as a raw material, which is formed and fired and foamed. It is known (for example,
No. 97443). The inorganic foam thus obtained has a circular or nearly circular cross section.
And such inorganic foam having a circular cross section has a small surface frictional force, so when piled up, there is a problem that the piled up easily breaks down, and this is mixed with mortar for construction. In this case, there is a problem that the foam is separated from the mortar. Furthermore, when this is used as artificial cultivation soil for horticulture, there is a problem that the ability to support plants is weak and the root survival rate is low.

On the other hand, as a granulator for granulating inorganic powder, a dish granulator, an extrusion granulator, a compression granulator, a fluidized granulator and the like are known. However, these granulators are devices for producing granules of a certain size, and cannot produce granules having a wide range of particle size distribution at one time.
There were problems such as difficulty in unmanned operation, difficulty in fine-graining, and high equipment and high production cost. Further, a commercially available crushing type stirrer only crushes a wet cake and has no granulation property.
There are many fine particles having a particle size of m / m or less, and the shape of the powder is mainly flat, and few of them have irregular cross sections.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art and to provide a granulator for producing granules having an irregular cross section suitable for artificial lightweight aggregate and artificial soil. It is in. Another object of the present invention is to provide a granulator capable of performing unattended operation, enabling fine granulation, and easily obtaining the above-mentioned granular material at low cost.

[0005]

Means for Solving the Problems The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, have completed the present invention. That is, according to the present invention, the casing includes a pair of rotating shafts that rotate in opposite directions in parallel in the casing, and the rotating shafts are formed by a set of several crushing blades assembled in a fan shape around the rotating shaft. A granulator body provided with a plurality of sets and several stirring blades, and provided with a number of blades hanging down from above the casing in the casing, and a top of the casing of the granulator body parallel to the rotation axis. Means for supplying as a raw material a wet molded product or a wet cake having inorganic powder and having surface adhering water, which are connected to the plurality of hoppers which are spaced apart along different directions A granulator is provided, comprising: a means for supplying powder; and a particulate discharge port provided at a bottom of a casing of a granulator main body. Further, according to the present invention, in the above configuration, a means for supplying a raw material and a means for supplying a powder for moisture adjustment are connected to the hopper on one end side, and the powder for moisture adjustment is supplied to the other hoppers. A granulator is provided, wherein the granulating means is connected. Further, according to the present invention, in the above configuration, another hopper is provided on the other end side, and the hopper is provided with an anti-fusing agent and / or
Alternatively, there is provided a granulator characterized in that a means for supplying a colorant is connected. Furthermore, according to the present invention,
In the above configuration, there is provided a granulator, wherein a vibrating sieve that sorts the obtained granules according to size is installed below the granule discharge port.

[0006]

According to the present invention, a wet molded product or a wet cake made of an inorganic powder and having water adhering to the surface is granulated by crushing and stirring by rotating a crushing blade and a stirring blade. Since the dry powder is gradually added by the moisture adjusting powder supply mechanism during the formation, the granular material having an irregular cross-section without surface adhering water can be continuously obtained.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on embodiments. FIG. 1 is a diagram schematically showing the structure of a granulator according to one embodiment of the present invention. A crushing granulation unit 1 forming a main part and a mechanism for supplying raw materials to the crushing granulation unit 1 are shown. 2, a mechanism 3 for supplying a dry powder for moisture adjustment, a mechanism 4 for supplying an anti-fusing agent, a coloring agent, etc. to the crushed granulation unit 1, and a vibrating screen for sieving the obtained granules. 5 is comprised.

[0008] The crushing and granulating section 1 is provided on the upper surface of the casing 6.
Four hoppers 7a to 7 connected to the supply mechanisms 2, 3, and 4
7d is provided upright along the longitudinal direction. Of course, the number of hoppers is not limited to this. That is, the raw material is supplied to the first hopper 7 a via the belt conveyor 8 and the screw feeder 10 is supplied from the storage tank 9.
The dry powder for moisture adjustment is supplied via the chute 11 and the dry powder for moisture adjustment is supplied to the second and third hoppers 7b and 7c from the storage tank 9 via the screw feeder 10 and the chute 11, respectively. In the hopper 7d, a fixed screw feeder 13 is provided from a storage tank 12.
In addition, an anti-fusing agent, a coloring agent, and the like are supplied via the chute 14. At one end of the bottom of the casing 6, a discharge port 6 'for discharging the obtained particulate matter is formed.

As is apparent from FIGS. 2 and 3, the crushing and granulating section 1 is provided with a gear box 14 at one end connected to the casing 6, and a motor 15 provided at an upper portion thereof. The rotation of the pulley 17 also serving as a flywheel, which is rotated via a V-belt 16, is transmitted to a pair of rotation shafts 18 in the casing 6 via gears, and the rotation shaft 1
8, 18 are rotated in opposite directions (the direction of the arrow in FIG. 5). As shown in the sectional views of FIGS. 4 and 5, crushing blades 19 each formed of a strip-shaped plate are provided on the rotating shafts 18 provided in parallel in the casing 6.
.. Are fixedly displaced little by little and project radially so as to form a fan shape in opposite directions with respect to the shaft. Each of the crushing blades 19 is a plate having one end face formed in a blade shape and having a length of 70 to 150 mm, a width of 20 to 40 mm, and a thickness of 10 to 20 mm. A slightly wider stirring blade 20 is located at a position between each pair of the crushing blades 19 projecting in the fan shape.
Is fixed. The stirring blades 20 have a length of 80.
~ 160mm, width 50 ~ 100mm, thickness 10 ~ 20m
m with respect to the axis of the rotating shaft 18 as shown in FIG.
It is formed by being attached at a position twisted by 5 °. The number of the stirring blades 20 is 5 to 20 for 10 crushing blades.
, Preferably 10-15. Further, in the upper part of the casing 6, a number of fixed blades 21 are located between the rotating crushing blades 19, stirring blades 20,.
・ It is suspended.

The hoppers 7a to 7d provided on the upper surface of the casing 6 are roller feeders 23 each having a helical gear-shaped groove 22 formed on the peripheral surface as shown in FIGS.
The roller feeder 23 is rotated by a deceleration motor 24 provided on one side of the hopper as shown in FIG.

Next, the operation will be described. First, in the granulator having the above-described configuration, a press-formed product or a dewatered cake of an inorganic powder containing about 22 to 23% of water is used as a raw material, and is passed through the first hopper 7 a by the belt conveyor 8. It is supplied to the crushing and granulating unit 1. As the inorganic powder, those generally used as raw material powders for artificial lightweight aggregates such as shale, clay, slate, coal ash and the like can be used. The particle size of these inorganic powders is 3 to 20 μm, preferably 5 to 10 μm. Further, the press-formed product can be obtained by adding a predetermined amount of water to the inorganic powder, kneading the mixture, and forming the kneaded product using a press-forming machine such as an extruder or a press. The shape of the molded product can be a block shape, a bar shape, a plate shape, a column shape, or the like. On the other hand, a dewatered cake can be obtained by dehydrating a slurry containing inorganic powder with a pressure dehydrator. The pressure-formed product and the dewatered cake of the inorganic powder are in a wet state (wet state) with water attached to the powder surface.

In the present granulator, the supplied raw material is granulated in the crushing granulation unit 1, and at the time of granulation, a dry powder for moisture adjustment is gradually added, and finally the adhered water is added. To produce granules free of cracks. For this reason, the dry powder for moisture adjustment is supplied separately (several times in this example). By doing so, there is an advantage that a granular material having no unevenness in water content can be obtained. The first dry powder supply is performed from the storage tank 9 to the first hopper 7a via the screw feeder 1 and the chute 11 at the same time as supplying the raw material. Of course, the first dry powder supply may be performed immediately after the supply of the raw material. The second and third dry powder supply operations are performed from the storage tank 9 through the screw feeder 1 respectively.
The process is performed on the second hopper 7b and the third hopper 7c through the hopper 0 and the chute 11. Here, the particle size of the dry powder is 3 to 20 μm, preferably 5 to 10 μm. Generally, it is preferable to use a powder having a particle size equal to or smaller than the inorganic powder as the granulation raw material. The amount of the dry powder to be added depends on the type of the dry powder, but it is necessary to absorb the water adhering to the surface of the granular material formed from the pressed product or the dehydrated cake and to give the surface-dried granular material. It is sufficient if it is a sufficient amount. Any dry powder may be used as long as it is water-absorbing, and any of inorganic powder and organic powder can be used. Examples of the inorganic powder include, in addition to the various materials described above as the raw material inorganic powder, refractory clay, clay chamotte powder, silica stone powder, alumina powder, and the like.Examples of the organic powder include a hydrophilic polymer. It is preferably used. Examples of such hydrophilic polymers include conventionally known polymers such as carboxymethylcellulose, hydroxyethylcellulose, cellulose derivatives such as cellulose sulfate, polyvinyl alcohol, polyvinylpyrrolidone, sodium polyacrylate, sodium polymethacrylate, and polyethylene oxide. , Sodium alginate, starch and the like, with the use of superabsorbent polymers being particularly preferred. Such a superabsorbent polymer is described in detail in, for example, "New Polymer High Material One Point Superabsorbent Polymer", published by Kyoritsu Shuppan Co., Ltd., by Yoshimasa Masuide.

The raw material supplied through the first hopper 7a is supplied with the dry powder through the hoppers 7a to 7c while being reduced by the crushing blades 19 in the crushing and granulating section 1. The small divided body is crushed into divided bodies, and the small divided bodies are stirred by the stirring blades 20. By this operation, the pressure-formed product or dewatered cake-like material of the inorganic powder as the raw material is granulated into granules having good fluidity without water attached to the surface, but the granules obtained in this way are: Crushing blade 19
···························· Due to its cross section, it does not show a circular shape but shows a different shape. Further, the particle size of the granular material becomes smaller as the stirring time elapses. Therefore, 2 to 10 minutes, preferably 5 to 8 minutes, of the stirring is sufficient. Dry powder addition time is 1
It is good to make it for about 5 minutes, preferably about 2 to 4 minutes.
The appropriate water content of the obtained granules is 16 to 17%.

In the final stage of crushing and granulation in the crushing and granulating section 1, an anti-fusing agent, a coloring agent, and the like are supplied from a storage tank 12 through a quantitative screw feeder 13 and a chute 14 as necessary. Here, an inorganic powder having strong fire resistance is used as the anti-fusing agent. As such,
For example, refractory clay powder, clay chamotte powder, silica stone powder, alumina powder and the like can be mentioned. The addition amount is usually 2 to 10 parts by weight based on 100 parts by weight of the raw material granules. The granulated material is guided to the electromagnetic vibration type vibrating sieve 5 through the granular material discharge port 6 ′, and the granulated material, which is a net material, is sent to a drying furnace or a baking furnace 25, Is subjected to recrushing.

Although the present invention has been described with reference to an embodiment, the present invention is not limited to this embodiment, and it goes without saying that various modifications and changes are possible.

[0016]

According to the present invention, since the above-mentioned configuration is adopted,
Granules having an irregular cross-section without water adhering to the surface can be continuously obtained at low cost. In addition, it is possible to reduce the size of the granules and to easily perform unmanned operation.

[Brief description of the drawings]

FIG. 1 is a system explanatory diagram of an entire granulator according to an embodiment of the present invention.

FIG. 2 is a side view of a crushing granulation section of the granulator.

FIG. 3 is a front view of a crushing granulation section of the granulator.

FIG. 4 is a sectional side view showing the inside of a crushing and granulating section of the granulator.

FIG. 5 is a sectional front view showing the inside of a crushing and granulating section of the granulator.

FIG. 6 is a perspective view illustrating an appearance of a roller feeder of the hopper.

[Explanation of symbols]

DESCRIPTION OF REFERENCE NUMERALS 1 crushing and granulating unit 2 mechanism for supplying raw materials 3 mechanism for supplying dry powder 4 mechanism for supplying an anti-fusing agent 5 vibrating sieve 6 casing 6 ′ granular material discharge ports 7 a to 7 d hopper 18 rotating shaft 19 crushing Blade 20 Stirrer blade 21 Fixed blade

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho 56-24939 (JP, U) Japanese Utility Model Sho 60-151536 (JP, U) Japanese Utility Model Sho 56-24938 (JP, U) (58) Field (Int. Cl. ⁷ , DB name) B01J 2/00-2/30

Claims (4)

(57) [Claims] 1. A plurality of sets of several sets of crushing blades arranged in a fan shape around the pair of rotating shafts which rotate in opposite directions in parallel in a casing. A granulator body provided with several stirring blades, and provided with a number of blades hanging down from above the casing in the casing, and a top portion of the casing of the granulator body in a direction parallel to the rotation axis. A plurality of hoppers spaced apart along
Means for supplying as a raw material a wet molded product or a wet cake-like material comprising inorganic powder and having surface adhering water, and a means for supplying a moisture adjusting powder, connected to the hopper, and a casing for the granulator body. A granulator comprising: a particulate matter discharge port provided at a bottom portion. 2. A means for supplying a raw material and a means for supplying a powder for moisture adjustment are connected to a hopper on one end side,
2. The granulator according to claim 1, wherein a means for supplying a water content adjusting powder is connected to the other hoppers. 3. A further hopper is installed on the other end side,
The granulator according to claim 1 or 2, wherein means for supplying a fusion preventing agent and / or a coloring agent is connected to the hopper. 4. The granulation according to claim 1, wherein a vibrating sieve that sorts the obtained granules according to size is installed below the granule discharge port. Machine.