JPH0728915Y2 - Double roll pressure granulator for powder - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double roll type pressure granulator for powder particles. More specifically, the present invention continuously pressurizes and granulates powder particles, and the narrow grooves or projection obstacles provided on the surface of the double roll during granulation cause internal cracks or scratches on the rod-shaped molded product. The present invention relates to a double-roll type pressure granulator capable of producing a fine-grain coagulated product having a desired particle size by forming a fragile portion such as, for example, and then subjecting the molded product to mechanical impact or bending.

[0002]

2. Description of the Related Art Recently, in each industry, efforts have been made to improve the productivity with the sophistication of production technology, but the material handling of raw materials and finished products is required to be efficient, and fine powder raw materials are required. Granulation is being actively promoted. Extrusion granulators such as screw type granulators, disc-and-roll type granulators, ring-and-roll type granulators, etc. are used as production equipment for high-density fine-grained coagulates such as fine-grained briquettes and fine-grained pellets. Further, in a rolling granulator, a roll molding machine, a roll compactor, etc. are used.

[0003]

In the above extrusion granulator, a large force is required when the raw material is pushed into the die hole, so the required power is large and the die hole is severely worn. The final raw material remains clogged in the die holes at the end of manufacturing, making it difficult to maintain the equipment. In addition, the machine becomes large because it requires a large amount of power. In particular, with regard to fine-grain briquettes, the roll-type molding machine has drawbacks such that the release of the product from the mold engraved on the roll surface is poor and the product yield is low. Further, the band-shaped agglomerate compacted with a roll compactor or the like must be taken into the crusher during the manufacturing process in order to size it to a certain particle size, and since it is re-pulverized in this process, there is a problem such as a decrease in molding efficiency. there were.

An object of the present invention is to solve these problems and to provide a facility capable of efficiently producing a fine-grain solidified product of good quality at low cost.

[0005]

DISCLOSURE OF THE INVENTION In the double roll type pressure granulator, the inventors of the present invention have paralleled a plurality of vertical grooves having a cross sectional shape of the product grain size on one or both roll surfaces in the circumferential direction of rotation. In addition, it has a structure in which one or both of the roll surfaces are provided with narrow grooves or projection obstacles intersecting the above vertical grooves at an angle or at an angle at intervals according to the product grain size. The present invention has been completed by finding that it is possible to continuously produce a fine-grained solidified product at a low cost extremely efficiently by using a granulator.

When the raw material is continuously squeezed and solidified by a roll having an appropriate narrow groove transversely to the vertical groove, the molding pressure acting between the rolls locally changes in the narrow groove portion, and that portion changes. Is weakened due to cracks. Also, when a projection obstacle is attached, that portion is locally weak. Therefore, a band-shaped pressed coagulated product continuously molded by the present granulator can be easily broken at a fragile portion by a small impact force or bending to obtain a coagulated product having a desired fixed size. In addition, unlike the briquette roll, this roll does not have individual molds and is continuous in the vertical groove, so the mold release of the pressed coagulated product from the roll surface is good, and therefore the adhesiveness that the briquette roll could not achieve. It is also possible to make fine-grained solidified products of certain raw materials.

Next, the structure of the double roll type pressure granulator of the present invention will be described with reference to the accompanying drawings.

This figure shows a configuration in which one is a vertical groove roll and the other is a vertical groove roll with a narrow groove or a projection obstacle.

FIG. 1 is a plan view of the granulator of the present invention, and FIG.
Also shows the sides. FIGS. 3 and 4 show a part of the cross section on the roll center line, showing an example in which the roll 1 in which the narrow groove 18 is further provided in the vertical groove and the vertical groove roll 2 are combined, and FIGS. Roll 1 with projection obstacle 19 fitted in
An example of a combination of the vertical groove roll 2 and

FIGS. 7 and 8 show an example of a band-shaped pressed solidified product obtained by this machine. More specifically, a pair of pressure rolls 1 of the same diameter are placed on the bed 8 of the pressure granulator.
2 and 2 are installed to face each other, 1 is a roll in which a narrow groove 18 or a protrusion obstacle 19 is attached to a flute roll, and 2 is a flute roll in a combination.

The flutes 17 of the two rolls are adapted to face each other and form a solidified grain-shaped cross section. Each of the rolls 1 and 2 is attached to the window-shaped frame of the bed 8 by the bearing 9 and the bearing housings 10 and 11.

The bearing box 11 of the roll 1 is structured to be movable back and forth by the roll gap adjusting bolts 12, and the bearing box 10 of the roll 2 is fixed to the window frame of the bed 8. After setting an appropriate roll gap with the adjusting bolt 12, a lock nut 13 is arranged to fix the position.

A twin wheel gear 3 is fixed to one end of the roll shafts 1 and 2, and the twin wheel gear 3 is adapted to rotate the rolls 1 and 2 in the opposite directions at a constant speed as indicated by arrows. A large sprocket wheel 4 is fixed to the other end of the roll shaft 2 for driving the roll, and a roller chain 6 hung on a small sprocket wheel 5 fixed to the output shaft of a motor 7 with a reducer. The structure is such that power is transmitted. The raw materials are charged into the hopper 14 provided on the pressure rolls 1 and 2, fed into between the vertical groove pressure rolls 1 and 2, and pressure-granulated up to the roll center line.

In the granulator shown in this figure, the roll 1 is provided with a narrow groove 18 or a projection obstacle 19 which intersects the longitudinal groove 17 in the horizontal direction. It plays the role of locally creating fragile parts at equal intervals according to the specified grain size in a strip-shaped product that is continuously solidified under pressure. The height H of the protrusion obstacle 19 is appropriately determined from the roll surface to the bottom of the flute depending on the physical properties of the raw material to be molded.

A conveyer conveyor 16 for pulling out the product is disposed below the pressure roll, and a hopper 15 for preventing the product from spilling between the pressure roll and the conveyor.
There is.

The grain shape of the solidified product is determined by the shape of the flutes of the pressure rolls 1 and 2, and the lengthwise direction is on the circumference of the narrow groove 18 or the projection obstacle 19 provided laterally to the flute 17. Determined by the pitch. If the shape of the flute is a semi-circle, columnar grain shape 2
If the vertical groove has a trapezoidal shape, it becomes like a prismatic grain shape 21.

In the continuous double roll pressure granulator, not only is the rolling performed by the pressing action of the pressure roll, but also the partial extrusion granulation action occurs. 10 to 10 from the pitch of the groove 18 or the protrusion obstacle 19
It is recognized that it will be as long as 40%. Therefore, the pitch of the grooves or protrusions in the lateral direction may be made shorter by 10 to 40% than the length of the prescribed grain shape according to the physical properties of the raw material to be granulated.

[0018]

EXAMPLES Next, Table 1 shows typical specifications of the double roll type pressure granulator of the present invention, and Table 2 shows the results of granulation using these.

[0019]

[Table 1]

[0020]

[Table 2]

[0021]

[Effects of the Invention] Since the raw material is pressed into the die hole of the extrusion granulator with a large pressure while it is granulated, the wall of the hole is scratched and worn. Since the press granulator squeezes the raw material so that it is sandwiched between both rolls, the raw material is granulated at a speed equal to or close to that of the roll surface, so that the roll surface is less worn. Further, the double roll type pressure granulator requires relatively small power as compared with the required power of the extrusion granulator. As an example, Table 3 shows a comparison using equipment for obtaining a cylindrical fine-grain molded product having a width of 5 mm from coal as a raw material.

[0022]

[Table 3]

In the case where a double-roll type pressure granulator is used to produce a fixed-size fine-grain solidified product from a sticky raw material,
In the conventional technique, the roll surface and the product are not separated from each other and cannot be used. However, in the granulator of the present invention, a combination of a flute roll and a roll in which a narrow groove is cut in the lateral direction with respect to the flute of one roll, or a flute roll and a protrusion obstacle on one side By combining the rolls, the product and the roll surface can be well separated from each other, and the fine-grained solidified product can be continuously produced efficiently.

With respect to sizing, the strength of the product is locally weak in the narrow groove or the part damaged by the projection obstacle, so that the product breaks due to an extremely weak impact, so that the solidified product is not re-powdered and the product yield is good. , High productivity.

As described above, the present invention is remarkably improved in performance, such as improved durability and improved yield of power saving products, as compared with the prior art, and greatly contributes to improved productivity.

[Brief description of drawings]

FIG. 1 is a plan view of a double roll type pressure granulator of the present invention.

FIG. 2 is a side view of the double roll type pressure granulator of the present invention.

FIG. 3 shows a part of a cross section of a roll portion in which a roll 1 in which vertical grooves are further provided with narrow grooves 18 and a vertical groove roll 2 are combined.

FIG. 4 shows a part of a cross section of a roll portion in which a roll 1 in which a narrow groove 18 is further provided in a vertical groove and a vertical groove roll 2 are combined.

FIG. 5 shows a part of a cross section of a roll portion in which a roll 1 in which a protrusion obstacle 19 is fitted in a flute roll and a flute roll 2 are combined.

FIG. 6 shows a part of a cross section of a roll portion in which a roll 1 in which a projection obstacle 19 is fitted in a flute roll and a flute roll 2 are combined.

FIG. 7 shows a strip-shaped pressed coagulum obtained using a roll with narrow grooves.

FIG. 8 shows a squeezed coagulum obtained using a roll with protrusion obstructions.

FIG. 9 shows a fine-grained solidified product produced by breaking a band-shaped pressed solidified product. The left side shows what is obtained when the flute shape is a semicircle, and the right side is what is obtained when the flute shape is a ladder shape. Show.

[Explanation of symbols]

 1 roll 2 roll 3 twin wheel gear 4 large sprocket wheel 5 small sprocket wheel 6 roller chain 7 motor 8 bed 9 bearing 10 bearing box 11 bearing box 12 roll gap adjusting bolt 13 lock nut 14 hopper 15 hopper 16 conveyor for transport 17 vertical groove 18 Narrow groove 19 Protrusion obstacle 20 Fine-grain solidified substance 21 Fine-grain solidified substance

Claims (1)

[Scope of utility model registration request] 1. A double roll type pressure granulator, wherein one or both rolls 1, 2 have a large number of vertical grooves having a cross sectional shape of the product grain size in parallel to the circumferential direction of rotation, and further. A structure in which one or both roll surfaces are provided with narrow grooves 18 intersecting the above-mentioned vertical grooves at an angle or intersecting at a certain angle or projection obstacles 19 having a height not protruding from the roll surface at intervals according to the product grain size. A double-roll type pressure granulator for powder and granules, characterized in that