JPS63126696A - Doubie roll type pressure pelletizing machine for - Google Patents

Abstract

PURPOSE:To efficiently and inexpensively obtain fine-grained solidified matter having good quality at a low cost by forming brittle parts on a molding by slender grooves or projecting hurdles provided on the surface of double rolls. CONSTITUTION:The roll 1 is provided with the slender grooves 18 or projecting hurdles 19 intersecting transversely with vertical grooves 17. Such grooves or projecting hurdles locally form the brittle parts at the equal intervals conformed to a specified grain size on the band-shaped molding which is continuously solidified and emitted by a pressure. The height H of the projecting hurdles 19 is determined adequate between the sizes from the roll surface up to the bottom of the vertical grooves according to the properties of the raw material to be molded. The grain shape of the solidified matter is determined by the shapes of the vertical grooves of the press rolls 1 and 2 and the shape in the longitudinal direction thereof is determined by the pitch on the circumference of the grooves 18 or hurdles 19 provided in the transverse direction of the grooves 17.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a double-roll pressure granulator for powder and granular materials.

More specifically, in continuously pressurizing granules, the present invention prevents internal cracks or scratches in the molded product by using narrow grooves or protruding obstacles provided on the surface of the double roll during granulation. The present invention relates to a double roll pressure granulator that makes it possible to produce a fine coagulated material with a desired particle size by forming weak parts and applying mechanical impact or bending to the molded product after granulation.

Conventional technology In recent years, with the advancement of production technology in various industries, efforts have been made to improve productivity, but efficiency is also required in material handling of raw materials and finished products.
Granulation of fine powder raw materials is actively progressing. Extrusion granulators are used to manufacture high-density fine coagulates such as fine briquettes and pellets, such as screw set granulators, disc-and-roll granulators, ring-and-roll granulators, etc. Further, in the rolling type granulator, a roll forming machine, a roll converter, etc. are used.

Problems to be Solved by the Invention The extrusion granulator described above requires a large force when pushing the raw material into the die hole, which increases the required power and causes severe wear of the die hole. The final raw material remains stuck in the die hole at the end of the process, making it difficult to maintain and manage the equipment.

In addition, since a large amount of power is required, the machine becomes large. Particularly for fine briquettes, roll-type molding machines have drawbacks such as poor separation of the product from the mold engraved on the roll surface and a low yield of the product. In addition, a crusher must be incorporated into the manufacturing process to size the band-shaped agglomerates compacted by a roll condenser etc. to a constant particle size, and because they are re-pulverized in this process, there are problems such as a decrease in molding efficiency. was there.

The object of the present invention is to solve these problems and provide equipment that can efficiently produce fine-grained coagulates of good quality at low cost.

Means for Solving the Problems The present inventors have developed a double-roll pressure granulator, in which a large number of vertical grooves with a cross-sectional shape of the product particle size are formed on the surface of one or both rolls in parallel to the rotational circumferential direction. The roll has a structure in which narrow grooves or protruding obstacles that intersect the vertical grooves perpendicularly or at a certain angle are installed on the surface of one or both of the rolls at intervals matching the particle size of the vehicle object. The present invention was completed based on the discovery that by using a granulator, it is possible to continuously produce fine coagulated particles extremely efficiently and at low cost.

When raw material is continuously compressed and solidified using rolls with appropriate narrow grooves in the transverse direction to the longitudinal grooves, the forming pressure acting between the rolls changes locally in the narrow groove areas, causing cracks, etc. The strength becomes weaker. Similarly, when a protruding obstacle is attached, the part becomes locally fragile. For this reason, the band-shaped compressed coagulum that is continuously formed using a wooden pile machine can be easily broken at weak parts by small impact force or bending, and a coagulate with a desired fixed particle size can be obtained. In addition, unlike briquette rolls, the molds of this roll are not separated individually, but are continuous with vertical grooves, so the roll surface and pressed coagulum are easily separated from the mold, resulting in adhesive properties that cannot be achieved with briquette rolls. It is also possible to make fine coagulates of certain raw materials.

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

This figure shows a combination of a vertically grooved roll on one side and a vertically grooved roll with narrow grooves or a roll with protrusions on the other side.

FIG. 1 shows a plan view of the granulator according to the invention, and FIG. 2 also shows a side view. Figure 3.4 shows a part of the cross section on the center line of the rolls, showing an example of a combination of roll 1 with narrow grooves 18 added to the vertical grooves and roll 2 with vertical grooves. An example of a combination of a roll 1 in which a protruding obstacle 19 is fitted into a grooved roll and a vertically grooved roll 2 is shown. FIGS. 7 and 8 show examples of band-shaped compressed coagulum obtained by this machine. To explain in more detail, pressure granulator bed 8
A pair of pressure rolls 1 and 2 having the same diameter are installed opposite each other on the top, and 1 has a vertical groove roll with a narrow groove 18 or a protruding obstacle 1.
9 is a roll, and 2 is a vertically grooved roll. The longitudinal grooves 17 of the mutual rolls are arranged to face each other correctly and form a coagulum grain-shaped cross section.

Each roll 1 and 2 is attached to a window-like frame of a bed 8 with a bearing 9 and a bearing housing 10 and 11.

The bearing box 11 of roll 1 has a structure that can be moved back and forth with a roll gap adjustment bolt 12, and the bearing box 11 of roll 2
0 has a structure that is fixed to the window frame of bed 8. After setting a suitable roll gap with the adjusting bolt 12, a rotary nut 13 is placed to fix the position.

A twin gear 3 is fixed to one end of the roll shafts 1 and 2, and the twin gear 3 rotates the rolls 1 and 2 at a constant speed in opposite directions as shown by arrows. A large sprocket wheel 4 is fixed to the other end of the roll shaft 2 to drive the rolls, and a roller chain is attached to a small sprocket wheel 5 fixed to the output shaft of a motor 7 with a reduction gear. It has a structure in which power is transmitted by 6. The raw material is introduced into a hopper 14 provided above the pressure rolls 1 and 2, fed between the vertically grooved pressure rolls 1 and 2, and granulated under pressure until it reaches the center line of the rolls.

In the granulator shown in this figure, the roll 1 is provided with narrow grooves 18 or protruding obstacles 19 that intersect with the vertical grooves 17 in the transverse direction, and these grooves or protruding obstacles are continuous. It plays the role of locally creating weak parts at equal intervals according to the specified particle size in the band-shaped product that comes out after pressure solidification. The height H of the protruding obstacle 19 is appropriately determined from the roll surface to the bottom of the vertical groove depending on the physical properties of the raw material to be molded.

A conveyor 16 for transporting the product is disposed below the pressure roll, and a hopper 15 is provided between the pressure roll and the conveyor to prevent the product from spilling.

The shape of the coagulated particles is determined by the shape of the vertical grooves on the pressure rolls 1 and 2, and the length direction is determined by the narrow grooves 1 formed horizontally with respect to the vertical grooves 17.
8 or the pitch on the circumference of the protruding obstacle 19. If the shape of the vertical groove is a semicircle, it will look like a cylindrical grain shape 20, '1II7! If the shape of is trapezoidal, the grain shape is prismatic 21
become that way.

In a continuous double-roll pressure granulator, not only is the pressure roll rolled by the squeezing action, but also part of the extrusion granulation action occurs.
8. It is also recognized that the protruding obstacle 19 is about 10 to 40% longer than the bi-sochi. Therefore, the pitch of the lateral grooves or protrusions may be made 10 to 40% shorter than the length of the specified grain shape in accordance with the physical properties of the raw material to be granulated.

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

Effects of the Invention Since the raw material is forced into the die hole of an extrusion granulator and granulated by passing through the die hole, the hole wall is scratched and worn, but double-roll pressure granulation as in the present invention Since the granulator gradually squeezes the raw material by sandwiching it between both rolls, it is granulated at the same speed as the roll surface or at a speed close to it, so there is little wear on the roll surface. Furthermore, compared to the required power of an extrusion granulator, a double roll pressure granulator requires relatively less power. As an example, Table 3 shows a comparison of equipment for obtaining a cylindrical fine-grain molded product with a width of 5 mm using coal as a raw material.

When attempting to produce a fixed-size fine coagulated product using a sticky raw material using a double-roll pressure granulator, the conventional technology could not be used because the roll surface and the product would separate from the mold.

However, in the granulator of the present invention, a combination of a vertically grooved roll and a roll in which narrow grooves are cut in the horizontal direction with respect to the vertical groove of one roll, or a combination of a vertically grooved roll and a roll with a protruding obstacle on one side is used. The combination of rolls allows for efficient continuous production of fine-grained coagulated material with good separation between the finished product and the roll surface.

Regarding grain size, the strength of the product is locally weak in areas damaged by narrow grooves or protruding obstacles, so it will break with an extremely weak impact, resulting in less re-powdering of the coagulated material and a high product yield, increasing productivity. is high.

In this way, the present invention has improved durability and improved durability compared to conventional technology.
Performance improvements such as reduction in power consumption and improvement in product yield are remarkable, and this greatly contributes to improvement in productivity.

[Brief explanation of the drawing]

FIG. 1 shows a plan view of the double-roll pressure granulator of the present invention, and FIG. 2 shows a side view thereof. Figures 3 and 4 are
A part of the cross section of a roll part that is a combination of a roll 1 with a narrow groove 18 added to the vertical groove and a vertically grooved roll 2 is shown.
The figure and FIG. 6 show a part of an analysis surface of a roll portion that is a combination of a roll 1 in which a protruding obstacle 19 is fitted into a vertically grooved roll and a vertically grooved roll 2. FIG. 7 shows a band-shaped compressed coagulum obtained using a roll with narrow grooves, and FIG. 8 shows a band-shaped press coagulate obtained using a roll with protruding obstacles. Figure 9 shows fine coagulates produced by breaking a band-shaped compressed coagulum; the one on the left is the one obtained when the longitudinal grooves are semicircular, and the one on the right is the one obtained when the longitudinal grooves are ladder-shaped. shows. (Brief explanation of the drawings) 1.2...Roll, 3...Double gear, 4...Large sprocket foil, 5...Small sprocket foil, 6
...Roller -f-I 7.7...Motor, 8
...Bed, 9...Bearing, 10.11...
Bearing box, 12...Roll gap adjustment bolt, 13...
Lock nut, 14... hopper, 15... hopper, 16... conveyor, 17... vertical groove, 1
8...Narrow groove, 19...Protrusion obstacle, 2o, 21.
...Fine coagulum.

Claims (1)

[Claims] In a double-roll pressure granulator, the surface of one or both rolls has a large number of vertical grooves parallel to the rotating circumferential direction, each having a cross-sectional shape of the product particle size, and the surface of one or both rolls has the above-mentioned grooves. Double-roll pressure forming of powder and granular material, characterized by comprising rolls with a structure in which narrow grooves or protruding obstacles that intersect perpendicularly or at a certain angle with vertical grooves are installed at intervals that match the product particle size. grain machine.