JP4411583B2 - Extrusion granulator and method of assembling cylindrical die used therefor - Google Patents

Description

The present invention, fertilizers and industrial chemicals, a method of assembling a cylindrical dialog for extrusion granulator extrusion granulation instrumentation 置及 originator of the particulate raw materials to granule pellets of ceramic raw materials.

Conventionally, the outer periphery of a cylindrical die having a plurality of molding holes formed in the side surfaces at the tips of two parallel rotating shafts is mounted so as to face each other, and the raw material powder fed between the cylindrical dies is An extrusion granulator that press-fits into a molding hole to obtain a granulated product is generally used.
In this type of extrusion granulator, if the supply amount of the raw material is increased to increase the production amount (processing amount), the pair of cylindrical dies are deformed as the load increases, and the interval between the contact surfaces is widened. In order to solve such a problem, in the extrusion granulation apparatus described in Japanese Patent Publication No. 7-63611, the cylinder is used to increase the rigidity of the cylindrical die and prevent the interval between the cylindrical dies from widening. The thing of the shape which made the flange project in the outer-periphery edge part of a shape die is proposed (refer to patent documents 1).

  Japanese Patent Publication No. 53-42474 discloses a powder compression roll for preventing a raw material from leaking from the side portion of the compression roll during granulation in a dry compression granulator and obtaining a granulated product having a uniform density. A roll having a groove having a depth of 0.5 to 10 mm in the circumferential direction of the roll surface and an angle of 20 to 85 ° with the bottom surface and a roll having a convex portion corresponding to the roll groove have been proposed (Patent Document 2). reference).

  Furthermore, in order to control the quality (density, hardness, size) of the granulated product in the extrusion granulator and the dry compression granulator, it is one important method to adjust the interval between the cylindrical dies or the compression rolls. It is. In this regard, although not a granulator, JP-A-6-47298 proposes a roll mill having an adjusting mechanism capable of adjusting the gap of the roll (see Patent Document 3).

Japanese Patent Publication No. 7-63611 Japanese Patent Publication No.53-42474 JP-A-6-47298

However, these technologies have the following major problems.
First, in the configuration shown in Patent Document 1, when the width of a cylindrical die is increased in order to further increase the production amount, not only the cylindrical die itself but also the interval between two parallel rotating shafts is opened. As a result, the opening of the cylindrical die is increased, and it is not possible to completely prevent the interval between the cylindrical dies from widening only by forming the flange at the outer peripheral edge of the cylindrical die.

  In addition, when the roll shape disclosed in Patent Document 2 is applied to a cylindrical die and a cantilever-support type extrusion granulator using a rotating shaft, a stamped joint is used to connect the cylindrical die and the rotating shaft. Since the outer peripheral shape of the cylindrical die becomes an obstacle and interferes with each other when trying to attach and detach the cylindrical die to the rotating shaft one by one, the two dies are combined. It is necessary to attach and detach at the same time. For this reason, there has been a problem that the efficiency of assembling the die is poor.

Furthermore, the mechanism for adjusting the gap of the roll disclosed in Patent Document 3 requires a complicated mechanism using a small screw jack. For this reason, the mechanism which adjusts the space | interval of the cylindrical die | dye of a granulator and a compression roll with a simple mechanism and desired the quality of the granulated material to be controlled freely was desired.

The present invention has been made in view of the above problems, and an extrusion granulator capable of preventing the interval between a pair of opposed cylindrical dies from being widened, and an extrusion capable of adjusting the interval between the cylindrical die and the compression roll in advance. and to provide a method of assembling the granulator and dry compression granulation device, an extrusion granulator for cylindrical excellent shape workability of assembly as well dialog.

In order to achieve the above object, an extrusion granulation apparatus according to the present invention comprises a cylindrical die having a plurality of molding holes, and two parallel rotating shafts so that the molding surfaces of the cylindrical die face each other. Each of which is attached to the tip of the cylindrical die, and the raw material powder fed between the cylindrical dies is press-fitted into the molding hole to obtain a granulated product, which is an extruding granulator that is opposite to the mounting end of the cylindrical die The end portion of the cylindrical portion forms a support portion whose outer diameter is reduced in a stepped shape from the molding surface, the outer periphery of the support portion is surrounded by a frame-like die interval fixing member , and the opposite cylindrical die One of them has a stepped outer diameter at each position before and after the molding surface from the front end to the base end, and the other cylindrical die has a front and rear end of the molding surface from the front end to the base end. The outer diameter is increased in a stepped manner corresponding to each position .

Further, the extrusion granulation apparatus according to the present invention is configured such that a cylindrical die having a plurality of molding holes is attached to the ends of two parallel rotating shafts so that the molding surfaces of the cylindrical die face each other. , An extrusion granulation apparatus for obtaining a granulated material by press-fitting raw material powder fed between the cylindrical dies into the molding hole, wherein one of the rotating shafts is a cylindrical shaft eccentric member. The shaft eccentric member has a longitudinal section whose inner center is concentric with the rotating shaft but whose outer center is eccentric from the axis of the rotating shaft, and one of the opposing cylindrical dies is The outer diameter is reduced in a stepped manner at each position before and after the molding surface from the tip to the base end, and the other cylindrical die corresponds to each position before and after the molding surface from the tip to the base end. Thus, the outer diameter is increased stepwise .

Further, a cylindrical die having a plurality of molding holes is attached to the ends of two parallel rotating shafts so that the molding surfaces of the cylindrical die face each other, and are fed between the cylindrical dies. An extruding granulator that obtains a granulated product by press-fitting raw material powder into the forming hole, and a cylindrical shaft eccentric member that penetrates one of the rotating shafts, and the rotating shaft An annular die eccentric member mounted on the support portion of the cylindrical die, and the longitudinal center of the shaft eccentric member and the die eccentric member are both concentric with the rotating shaft. The outer center is eccentric from the axis of the rotating shaft.

Further, the method for assembling the cylindrical die of the extrusion granulation apparatus according to the present invention includes a cylindrical die having a shape in which the outer diameter is increased stepwise at each position before and after the molding surface from the distal end to the proximal end. A cylindrical die having a shape in which the outer diameter is reduced in a stepped manner corresponding to each position before and after the molding surface from the front end to the base end is attached to the one rotary shaft. It is mounted on a rotating shaft.

As is apparent from the above description, the present invention attaches a cylindrical die having a plurality of forming holes to the tips of two parallel rotating shafts so that the forming surfaces of the cylindrical die face each other. And an extrusion granulation apparatus for obtaining a granulated product by press-fitting raw material powder fed between the cylindrical dies into the molding hole, wherein the end opposite to the mounting end of the cylindrical die is the above-mentioned end A support portion whose outer diameter is reduced in a stepped shape from the molding surface is formed, the outer periphery of the support portion is surrounded by a frame-shaped die interval fixing member , and one of the opposing cylindrical dies is The outer diameter is reduced stepwise at each position before and after the molding surface from the front end to the base end, and the other cylindrical die corresponds to each position before and after the molding surface from the front end to the base end. since, characterized in that the outer diameter stepped shape is expanded Te, wherein the granulation in It is possible to prevent the distance between the tip portion of the cylindrical die is widened. Furthermore, since it is possible to attach / detach the cylindrical die to / from the rotating shaft one by one, labor for attaching / detaching the cylindrical die to / from the extrusion granulator main body can be reduced.

In the present invention, a cylindrical die having a plurality of forming holes is attached to the ends of two parallel rotating shafts so that the forming surfaces of the cylindrical die face each other. An extruding granulator that obtains a granulated product by press-fitting the raw material powder fed into the molding hole, and one of the rotating shafts is inserted into a cylindrical shaft eccentric member. The longitudinal section of the shaft eccentric member has an inner center that is concentric with the rotating shaft, but an outer center that is eccentric from the axis of the rotating shaft, and one of the opposing cylindrical dies has a proximal end from the distal end. The outer diameter is reduced stepwise at each position before and after the molding surface, and the other cylindrical die is stepped correspondingly at each position before and after the molding surface from the distal end to the base end. the outer diameter is enlarged, the spacing of the cylindrical die by varying the spacing of the rotary shaft It can be an integer. Thereby, properties such as density, hardness and size of the granulated product can be controlled in advance.

In the present invention, a cylindrical die having a plurality of forming holes is attached to the ends of two parallel rotating shafts so that the forming surfaces of the cylindrical die face each other. An extruding granulator that obtains a granulated product by press-fitting the raw material powder fed into the molding hole, and a cylindrical shaft eccentric member that penetrates one of the rotating shafts, An annular die eccentric member mounted on the support portion of the cylindrical die on the rotating shaft, and the longitudinal sections of the shaft eccentric member and the die eccentric member are both centered on the rotating shaft. Concentric but the outer center is eccentric from the axis of the rotating shaft, and one of the opposing cylindrical dies is stepped at each position before and after the molding surface from the tip to the base. The outer diameter is reduced, and the other cylindrical die is placed on the front and rear sides of the molding surface from the front end to the base end. Wherein the granulation along with the order, characterized in that expanded outer diameter corresponding to the stepped shape at location granulate density and hardness, can be pre-controlling properties such as the size It is possible to prevent the interval between the tip portions of the cylindrical dies from widening.

Hereinafter, the best mode for carrying out the present invention will be described. According to the present invention, the end opposite to the mounting end of each of the cylindrical dies mounted on the ends of two parallel rotating shafts has a support portion whose outer diameter is reduced in a stepped shape from the molding surface. The outer periphery of the support portion is surrounded by a frame-shaped die interval fixing member.

Further, in the present invention, one of the rotating shafts is inserted into a cylindrical shaft eccentric member, and the longitudinal center of the shaft eccentric member is concentric with the rotating shaft, but the outer core is the rotating shaft. It is an extrusion granulator or a dry compression granulator that is eccentric from the axis of the shaft. Further, according to the present invention, one of the pair of cylindrical dies opposed to each other has a stepped outer diameter reduced at each position before and after the molding surface from the front end to the base end, and the other cylindrical die. Is characterized in that the outer diameter is increased stepwise correspondingly at each position before and after the molding surface from the distal end to the proximal end. In addition, the stepped shape of the cylindrical die requires that the inclination angle θ formed with the side wall of the cylindrical die is 20 to 85 °, and the enlargement or reduction amount h is in the range of 0.5 to 10 mm. Yes (Fig. 6).

Here, the extrusion granulation apparatus in the present invention refers to a cylindrical die having a plurality of molding holes pierced at the tips of two parallel rotating shafts so that the molding surfaces of the cylindrical die face each other. It means an extrusion granulating apparatus of a type in which a raw material powder that is mounted and fed between the cylindrical dies is press-fitted into the forming hole to produce a granulated product (pellet). The fact that the cylindrical dies are respectively attached to the tips of the two rotating shafts means that the extrusion granulation apparatus of the present invention is a cantilever support system.
In the present invention, the cylindrical die refers to the tip of the rotating shaft of an extrusion granulator in order to obtain a granulated product of a predetermined shape through a large number of molding holes formed through the outer peripheral surface by pressurizing the charged raw material. Means a component part of the extrusion granulation apparatus to be mounted on.

The present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of an essential part showing the relationship between a cylindrical die and a rotating shaft of an extrusion granulation apparatus according to the present invention.
The two parallel rotating shafts 1a and 1b have a shape in which the outer diameters at both ends are reduced in a stepped manner from the outer diameter at the center, and a flange-shaped mounting seat 3a is provided at the outer peripheral portion of the tip. , 3b are respectively fitted. Cylindrical cylindrical dies 2a and 2b are detachably fastened to the mounting seats 3a and 3b by bolts.
One end of the rotary shaft 1a is rotatably supported by bearings 6, and the bearing 6 is fitted in a bearing case 5 fixed in a box-shaped casing 4. . The other rotating shaft 1b is rotatably supported at both ends by bearings 8. The bearing 8 is mounted at both ends in a shaft eccentric bush 7 which is a shaft eccentric member installed on the casing 4. It is fixed.

As shown in FIG. 2, the shaft eccentric bush 7 has a longitudinal section whose inner center is concentric with the rotating shaft 1 b, but whose outer center C is eccentric by δ from the shaft center of the rotating shaft 1 b. Eight fixed grooves 7a are formed radially on the end face of the eccentric bush 7 at regular intervals in the circumferential direction (FIG. 3). A long-plate-shaped shaft stopper 9 is fastened to the end surface of the casing 4 by fixing bolts 9a and 9b at an angle corresponding to the forming angle of the fixing groove 7a, and the end of the stopper 9 is fixed to the fixing surface. The shaft eccentric bush 7 is fixed to the casing 4 by fitting in the groove 7a.

A pulley 10 is connected to the base end of the rotating shaft 1a, and the pulley 10 is connected to a motor which is a driving means (not shown). Since the rotary shafts 1a and 1b are engaged with each other by gears 11 and 11 provided at the respective base ends, the rotary shaft 1b is rotated when the motor is driven to rotate the rotary shaft 1a. Also rotate together.

Each of the cylindrical dies 2a and 2b has a plurality of molding holes formed in its molding surface 12, and the cylindrical dies 2a and 2b are opposite to the ends attached to the rotary shafts 1a and 1b. A support portion having an outer diameter smaller than that of the molding surface 12 is formed at the end portion. One of the cylindrical dies 2a is rotatable by a support portion supported by a bearing 13, and the bearing 13 is inscribed in a housing 14 whose outer periphery is a frame-shaped die interval fixing member. It is fixed.
The other cylindrical die 2b is made rotatable by a support portion supported by a bearing 16 fitted in the bearing case 15, and the bearing case 15 is a cylindrical die eccentric member. The die eccentric bushing 17 is fitted into a certain die eccentric bushing 17, and the die eccentric bushing 17 is fixed in contact with the housing 14. In the longitudinal section of the eccentric bush 17 for the die, the inner center is concentric with the rotary shaft 1b as in the eccentric bush 7 for the shaft, but the outer center is eccentric by δ from the axial center of the rotary shaft 1b.

That is, since the shaft eccentric bush 7 and the die eccentric bush 17 are both on the same line, the die eccentric bush 17 matches the amount of rotation of the shaft eccentric bush 7. By rotating the cylindrical die 2b, the cylindrical die 2b can be relatively translated from the cylindrical die 2a by the same distance as the distance the rotational shaft 1b is relatively translated from the rotational shaft 1a. Yes.
Further, eight fixing grooves 17 a are formed radially on the end surface of the die eccentric bushing 17 in the circumferential direction at equal intervals with the fixing groove 7 a in the shaft eccentric bushing 7. A long plate-shaped die stopper 18 is fastened by fixing bolts 18a and 18b at an angle corresponding to the angle of formation of the fixing groove 17a. The shaft eccentric bush 17 is fixed to the housing 14 by fitting the end of the die stopper 18 into the fixing groove 17a (FIG. 4).

Next, the actual granulation process in the extrusion granulation apparatus according to the present invention will be described. First, the optimum interval between the cylindrical dies 2a and 2b is selected for the raw material powder to be granulated first. This interval is obtained empirically from past granulation data or is determined based on results previously found by preliminary tests. The operation of adjusting the interval between the cylindrical dies 2a and 2b is performed as follows.

First, the fixing of the shaft eccentric bush 7 to the casing 4 is released.
That is, the fixing bolts 9a and 9b of the shaft stopper 9 engaged with the fixing grooves 7a formed on the end face of the shaft eccentric bush 7 are loosened and the fixing bolts are screwed out from screw holes (not shown) drilled in the case 4. 9a and 9b are removed, and the shaft stopper 9 is extracted from the fixing groove 7a. As a result, the shaft eccentric bush 7 is fixed to the case 4 by the shaft stopper 9, and the shaft eccentric bush 7 becomes rotatable relative to the case 4. Next, the shaft eccentric bush 7 is rotated by a required amount to the left or right together with the rotating shaft 1b, and the fixing bolt 9a in which the center 4 of the fixing groove 7a at a different position from the beginning is drilled in the case 4 and It is positioned so as to come on a line connecting the screw holes for 9b.
Subsequently, the shaft stopper 9 is fastened to the case 4 by screwing the fixing bolts 9a and 9b into the screw holes, and an end portion of the shaft stopper 9 is fitted into the fixing groove 7a, thereby the shaft eccentricity. The bush 7 is fixed to the case 4 so that it cannot rotate again.

Next, the eccentric bush 17 for the die is rotated by a necessary amount in the same procedure. That is, the fixing bolts 18a and 18b of the die stopper 18 whose ends are fitted in the fixing grooves 17a formed on the end surface of the eccentric bush 17 for die are loosened and drilled in the wall surface of the housing 14. The fixing bolts 18a and 18b are removed from the screw holes that are not formed, and the die stopper 18 is extracted from the fixing groove 17a.
As a result, the die eccentric bush 17 is fixed to the housing 14 by the die stopper 18, and the die eccentric bush 17 becomes rotatable. Then, the die eccentric bush 17 is rotated together with the cylindrical die 2b by the same amount in the same direction as the rotation of the shaft eccentric bush 7, and the fixing groove 17a is fixed to the housing 14 at the center thereof. The bolts 18a and 18b are positioned so as to be on a line connecting screw holes (not shown). Subsequently, the die stopper 18 is fastened to the housing 14 by screwing the fixing bolts 18a and 18b into the screw holes, and an end portion of the die stopper 18 is fitted into the fixing groove 17a, thereby the die eccentricity. The bush 17 is fixed to the housing 14.

As a result, the axial center of the cylindrical die 2b and the axial center of the rotary shaft 1b coincide with each other, and the interval between the cylindrical die 2b and the cylindrical die 2a is adjusted to a value selected first. The interval between the cylindrical dies 2a and 2b is larger than 0 and can be changed in the range of 2δ at the maximum. The shaft eccentric bush 7 is rotated to change the distance between the rotation shaft 1b and the rotation shaft 1a, and then the die eccentric bush 17 is rotated to rotate the cylindrical die 2a. The operation of changing the distance between the cylindrical die 2b and the cylindrical die 2b has been described. However, since the cylindrical dies 2a and 2b are integrally attached to the rotary shafts 1a and 1b, the operation is completely completed in this way. Independent operation is difficult.
Therefore, in practice, an operation for adjusting the distance between the cylindrical dies 2a and 2b is simultaneously performed while an operation for adjusting the distance between the rotation shafts 1a and 1b is performed, or the rotation shafts 1a and 1b are adjusted. The distance between the axes between the cylindrical dies 2a and 2b is changed by a distance corresponding to the distance, and this operation is repeated alternately to finally change the distance between the axes. It is necessary to perform an operation of setting the interval between the cylindrical dies 2a and 2b.

Next, by driving a motor (not shown) as a driving means and rotating the rotary shaft 1a connected to the pulley 10, the rotary shaft 1b is also rotated in synchronism with this, and the rotary shafts 1a and 1b are rotated at the tips of the rotary shafts 1a and 1b. Both the mounted cylindrical dies 2a and 2b are rotated at a constant speed. Thereafter, raw material powder is supplied onto the cylindrical dies 2a and 2b from a raw material charging hopper (not shown) provided above the extrusion granulator, and the raw material powder supplied between the cylindrical dies 2a and 2b is compressed. Then, granulation is performed by passing the molding hole, and the granulated material is taken out from the front surface of the cylindrical dies 2a and 2b through the inner hollow portions of the cylindrical dies 2a and 2b.

When the input amount of the raw material is increased to increase the processing amount during the granulation operation, or the cylindrical die 2a, 2b having a larger width (molding surface) is used from the beginning for a large amount of processing. Since the load at the time of granulation increases, the force applied to the cylindrical dies 2a and 2b in the opening direction increases, but as described above, the cylindrical shape of the cylindrical dies 2a and 2b. The support portion of the die 2a is rotatably supported by the bearing 13, the outer periphery of the bearing 13 is fixed in contact with the housing 14, and the support portion of the cylindrical die 2b is the bearing. The die eccentric bush 1 that is rotatably supported by the bearing 16 fitted in the case 15 is inscribed in the housing 14. Since there is a configuration that is fitted into the cylindrical die 2a, 2b is to spread the spacing integrally in a fixed state the cylindrical die 2a, 2b are completely suppressed.

In order to granulate, the cylindrical dies 2a and 2b must be mounted on the rotary shafts 1a and 1b. When the cylindrical dies 2a and 2b are worn or the size and shape of the granulated material are changed, the cylindrical dies 2a and 2b need to be replaced with new ones. The cylindrical die 2a according to the present invention has a stepped outer diameter reduced at each position before and after the molding surface from the distal end to the proximal end, and the other cylindrical die 2b extends from the distal end toward the proximal end. Since the outer diameter of the cylindrical die 2a is enlarged by the same amount as the reduction amount of the outer diameter of the cylindrical die 2a in a stepped manner at each position before and after the molding surface, the cylindrical die 2a It is not necessary to attach or detach the rotary shaft 1a or 1b in a state of being combined with 2b in advance. The cylindrical die 2b is attached to or detached from the rotary shaft 1b first, and then the other cylindrical die 2a is attached to the rotary shaft 1a. Detachable.

That is, when the cylindrical dies 2a and 2b are first mounted, first, only the cylindrical die 2b is fastened to the mounting seat 3b to be mounted on the rotary shaft 1b, and then the cylindrical die 2a. Is gradually moved from the base end side of the cylindrical die 2b toward the base end of the rotary shaft 1a along the outer periphery of the molding surface, and when reaching the mounting seat 3a, the mounting seat 3a is moved to the mounting seat 3a. It can be fastened and attached to the rotary shaft 1a. When removing the cylindrical dies 2a and 2b from the rotary shafts 1a and 1b, the cylindrical die 2a is first attached to the rotary shaft 2a, contrary to the above-described operation of attaching the cylindrical dies 2a and 2b. Then, the cylindrical die 2b is removed from the rotary shaft 1b. For this reason, it is possible to prevent the raw material from leaking from the side surface portion of the cylindrical die during granulation and maintain the effect of obtaining a granulated product having a uniform density, while replacing the cylindrical dies 2a and 2b. Therefore, it is possible to increase the working efficiency.

Further, the dry compression granulator in the present invention is a method in which a compression roll having a pocket serving as a briquette mold on the outer peripheral surface is attached to two parallel rotating shafts, and raw material powder is continuously put between the compression rolls. Manufactures molded products using equipment (briqueting machine) that supplies and compresses and forms molded products with high density and shape, and compression rolls that have the same structure but do not have pockets on the outer periphery. Means both of the equipment (roll compacting machine). And the dry compression granulation apparatus in the present invention is not limited to the cantilever support system in which the compression roll is mounted on the tip of the rotating shaft, but both of the both-end support system in which the compression roll is mounted in the center of the rotating shaft. Things are included.

  Note that the invention according to claim 1 of the present application is not limited to an extrusion granulator, and is a cantilever support type dry type characterized in that a support portion formed at an end portion of a compression roll is surrounded by a roll interval fixing member. It can also be applied as a compression granulator. Further, the invention according to claim 4 of the present application is not limited to the cylindrical die for the extrusion granulator, but can be applied to a compression roll for a dry compression granulator of a cantilever support system. Similarly, the cylinder according to claim 6 The method of assembling the die is also applicable to the method of assembling the compression roll in the cantilever-support type dry compression granulator.

  It can prevent that the space | interval of cylindrical dies in an extrusion granulation apparatus spreads during granulation. In addition, since it has a mechanism to change the distance between the pair of cylindrical dies in the extrusion granulator and the distance between the pair of compression rolls in the dry compression granulator, the quality of the granulated material such as density, hardness and size is controlled. Furthermore, since the shape of the cylindrical die is made to be relatively easy to replace, the industrial applicability is great.

It is principal part sectional drawing of the extrusion granulation apparatus in this invention. It is a figure explaining the adjustment mechanism of the distance between rotating shafts by the eccentric bush 7 for shafts of this invention. It is a BB arrow line view in FIG. It is CC arrow line view in FIG. It is a principal part external view of the extrusion granulation apparatus in this invention. It is a cross-sectional enlarged view of one of a pair of cylindrical dies in the extrusion granulation apparatus of the present invention.

Explanation of symbols

1a, 1b Rotating shafts 2a, 2b Cylindrical die 17 Die interval fixing member
7 Eccentric member 17 Eccentric member for die

Claims (4)

A cylindrical die in which a plurality of molding holes are perforated is attached to the ends of two parallel rotating shafts so that the molding surfaces of the cylindrical die face each other, and the raw material fed between the cylindrical dies An extrusion granulation apparatus for obtaining a granulated product by press-fitting powder into the molding hole,
The end of the cylindrical die opposite to the mounting end forms a support portion whose outer diameter is reduced stepwise from the molding surface, and the outer periphery of the support portion is surrounded by a frame-shaped die interval fixing member. In addition, one of the opposing cylindrical dies has a stepped outer diameter reduced at each position before and after the molding surface from the front end to the base end, and the other cylindrical die is the base end from the front end. An extrusion granulator characterized in that the outer diameter is increased stepwise correspondingly at each position before and after the molding surface toward the end . A cylindrical die in which a plurality of molding holes are perforated is attached to the ends of two parallel rotating shafts so that the molding surfaces of the cylindrical die face each other, and the raw material fed between the cylindrical dies An extrusion granulation apparatus for obtaining a granulated product by press-fitting powder into the molding hole,
One of the rotating shafts is inserted into a cylindrical shaft eccentric member, and the longitudinal center of the shaft eccentric member is concentric with the rotating shaft, but the outer center is the axis of the rotating shaft. One of the opposing cylindrical dies is reduced in a stepped outer diameter at each position before and after the molding surface from the front end to the base end, and the other cylindrical die is the front end. An extruding granulator characterized in that the outer diameter expands in a stepped manner corresponding to each position before and after the molding surface from the base to the base end . In the extrusion granulator according to claim 1,
A cylindrical shaft eccentric member penetrating one of the rotating shafts, and an annular die eccentric member mounted on the support portion of the cylindrical die on the rotating shaft, An extrusion granulation apparatus characterized in that the longitudinal centers of the shaft eccentric member and the die eccentric member are such that the inner center is concentric with the rotation shaft, but the outer center is eccentric from the axis of the rotation shaft. A cylindrical die in which a plurality of molding holes are perforated is attached to the ends of two parallel rotating shafts so that the molding surfaces of the cylindrical die face each other, and the raw material fed between the cylindrical dies A method of assembling a cylindrical die in an extrusion granulation apparatus that press-fits powder into the molding hole to obtain a granulated product,
A cylindrical die having a stepped outer diameter is attached to one of the rotating shafts at each position before and after the molding surface from the distal end toward the proximal end, and then from the distal end toward the proximal end. A cylindrical die in an extrusion granulation apparatus, wherein a cylindrical die having a stepped outer shape corresponding to each position before and after the molding surface is attached to the other rotating shaft. Assembly method.

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