JP2002126549A - Crushing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crushing device capable of enhancing a discharge efficiency by easily discharging a substance crushed to a predetermined grain size to the outside of a crushing chamber. SOLUTION: In this crushing device, a rotatable crushing rotor 22 provided with a plurality of crushing blades 21,... and a fixed blade 30 arranged oppositely to the crushing rotor 22 are provided in a crushing chamber 10 accommodating a substance to be crushed; and a screen 65 on which a plurality of discharge holes 67 for discharging the crushed substance sheared by the crushing blades 21,... and the fixed blade 30 to the outside of the crushing chamber 10 is arranged from the fixed blade 30 in the rotation direction of the crushing rotor 22. A plurality of circumferential grooves 66,... each having a shape analogous to a tip end shape of each of the crushing blades 21,... are formed on the screen 65 and the screen 65 is arranged such that the rotating crushing blades 21,... are passed through the insides of the circumferential grooves 66,....

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crusher capable of crushing various kinds of waste such as waste plastic, wood, paper and the like.

[0002]

2. Description of the Related Art A crushing rotor rotatable with a crushing blade having a V-shaped tip,
A so-called uniaxial crushing apparatus in which a fixed blade arranged opposite to the crushing rotor is provided inside the crushing chamber, the shearing action between the crushing blade and the fixed blade is performed by the crushing object put into the crushing chamber. The crushed material is selected by a screen arranged at predetermined intervals on a crushing rotor, and the crushed material that has been sheared to a predetermined particle size from a plurality of discharge holes formed in the screen is selected. It is designed to be discharged outside the crushing chamber.

In the screen, one flat plate is curved in an arc of about 1/4 so as to follow the rotation locus of the crushing blade, and a plurality of discharge holes for discharging the material to be crushed are formed in the flat plate. Have been.

However, since a large gap is formed between the crushing blade having a V-shaped tip and a screen having a curved flat plate, the material to be crushed is made of a light material such as plastic or paper. If so, there is a problem that even if crushed to a predetermined particle size, it may return to the crushing chamber without being discharged from the discharge hole of the screen.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a crushing apparatus capable of easily discharging a crushed object having a predetermined particle size to the outside of a crushing chamber and improving the discharge efficiency. I do.

[0006]

In order to solve the above-mentioned problems, a crushing apparatus according to the present invention has a plurality of crushing blades 2 inside a crushing chamber 10 for accommodating a crushed object.
Are provided with a rotatable crushing rotor 22 having a fixed blade 30 disposed opposite to the crushing rotor 22, and a crushing blade is provided in the rotation direction of the crushing rotor 22 from the fixed blade 30. In a crushing apparatus provided with a screen 65 having a plurality of discharge holes 67 for discharging the crushed material that has been sheared by the fixed blades 30 to the outside of the crushing chamber 10, , A plurality of circumferential grooves 66 having a shape similar to the shape of the tip of the crushing blades 21,...
Are arranged so as to pass through the circumferential grooves 66,.

Therefore, the crushing blade 2 is provided on the screen 65.
A plurality of circumferential grooves 66,... Having a shape similar to the shape of the tip of 1,.
The crushed objects pushed to the tips of the crushing blades 21 by passing through the crushing blades 21 and the circumferential grooves 6.
6, it becomes easy to be discharged out of the crushing chamber by being caught in the gap. At this time, if the gap between the crushing blades 21,... And the circumferential grooves 66,... Is reduced, the finely sheared material to be crushed can be easily discharged to the outside of the crushing chamber.

Further, the screen 65 has circumferential grooves 66,.
Is formed, the surface area of the screen 65 can be increased as compared with a screen in which one flat plate is curved in an arc shape. In addition, if the discharge holes 67 are formed in the screen 65, the aperture ratio of the screen 65 is increased, and the crushed material is more easily discharged.

The circumferential grooves 66 of the screen 65 are formed adjacent to each other in the axial direction of the crushing rotor 22 in parallel with each other, and the crushing blades of the crushing rotor 22 are formed. 21 are arranged corresponding to the respective circumferential grooves 66. In this case, the crushing blades 21 corresponding to the circumferential grooves 66 of the screen 65 formed in the axial direction,
Are passed through the circumferential grooves 66 of the screen 65, the crushed material is discharged in the axial direction.

Further, as described in claim 3, the tips of the crushing blades 21,... Have a V-shape, and the crushing blades 21,.
The screen 65 is opposed to the adjacent side of the tip of
Of the circumferential grooves 66,. In this case, the screen 6 is provided on the side adjacent to the tip of the crushing blade 21.
5 is close to the side wall of the circumferential groove 66, and the crushing blade 2
A minute gap is formed in accordance with the shape of the front end portion of No. 1. The object to be crushed extruded to the front surface of the crushing blade 21 is caught in the gap, is finely sheared, and is easily discharged to the outside of the crushing chamber.

In addition, according to a fourth aspect of the present invention, a discharge hole 67 of the screen 65 is provided on the discharge side of the screen 65.
A discharge hopper 70 for accommodating the crushed material discharged from the hopper is provided, and a cyclone 71 for collecting the crushed material by the suction action of the blower 72 is connected to the discharge hopper 70.

Therefore, since the crushed material discharged from the screen 65 is collected by the cyclone 71 by the suction action of the blower 72, a light crushed material such as paper is efficiently discharged from the screen 65. Will be done.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIGS. 1 and 2, the crushing apparatus 1 includes a substantially box-shaped apparatus frame 2 supported by a plurality of legs (not shown), and a crushing chamber 10 of the apparatus frame 2. And a cooling means 28 for cooling a crushing rotor 22 of the crushing means 20, which will be described later.
And a pressing and supplying means 55 for pressing the material to be crushed into the crushing processing means 20.

The apparatus frame 2 has an upper opening so that a plurality of objects to be crushed can be introduced into the apparatus frame 2. The opening input section 3 and the crushing chamber 10 communicate with each other, and Can be transferred from the opening input section 3 to the crushing chamber 10.

Further, guide plates 5 a, 5 a constituting a part of each of the reinforcing frames 4, 4 arranged opposite to the opening input section 3 are tapered so as to approach the crushing chamber 10. The object to be crushed is guided by the guide plates 5a, 5a and supplied to a suitable position for crushing in the crushing chamber 10.

The crushing means 20 comprises a plurality of crushing blades 2.
1 is a crushing rotor 22 detachably attached to the outer peripheral surface
And a fixed blade 30 attached to an end of the reinforcing frame 15 located below the crushing chamber 10.
Both ends of the crushing rotor 22 are rotatably supported by bearings in the shaft supports 6, 6 fixed to the apparatus frame 2.

Here, as shown in FIG. 3, the crushing rotor 22 has a cylindrical body 23 disposed between the side plates 2a and 2b.
And a shaft 24 inserted into the cylindrical body 23 and fixed concentrically with the cylindrical body 23, and the shaft 24 protruding from the side plate bodies 2 a, 2 b is rotatably supported by the shaft supports 6, 6. And is connected to a hydraulic motor.

Further, in the crushing rotor 22, a water supply channel 25 as a cooling water channel for cooling the crushing rotor 22 is formed along the axis at one axial portion of the shaft 24. A drain passage 26 as a cooling water passage is formed along the axis at the axial center portion, and a flow passage communicating with the water supply passage 25 and the drain passage 26 is formed on the inner peripheral surface of the cylindrical body 23.
This flow path has an annular concave portion, is located at the axial center of the cylindrical body 23, and is referred to as a water jacket 27. The cooling means 28 of the crushing rotor 22 is constituted by these channels 25 to 27.

Next, the attachment / detachment structure of the crushing blade 21 will be described in detail with reference to FIGS. 1 and 2 and FIGS.
Such a detachable structure is provided by the cylindrical body 2 constituting the crushing rotor 22.
A plurality of mounting holes 31,... Formed so as to be gradually displaced in the circumferential direction along the rotation axis direction of the outer peripheral surface of No. 3, and a fitting member that is removably fitted into the mounting holes 31,. The wedge 32 and a wedge holder 40 as a blade holder of the crushing blade 21 fixed to the mounting hole 31 by the wedge 32 are provided.

The mounting hole 31 is formed so that its center line is eccentric from the radial direction of the crushing rotor 22, and cuts a circular opening first insertion portion 31a and a part of a peripheral edge of the first insertion portion 31a. It comprises an opening-shaped second insertion portion 31b lacking and communicating with the first insertion portion 31a, and relief portions 31c formed at both corners of the second insertion portion 31b. The reason why the escape portion 31c is formed in the attachment hole 31 is to avoid contact between the second insertion portion 31b and the edge of the crushing blade 21.

The wedge 32 has a mounting hole 31 on one surface.
An arc-shaped contact surface 33 is formed in contact with the inner peripheral surface of the mounting hole 31, and an inclined surface 34 inclined at a predetermined angle with respect to the axial direction of the mounting hole 31 is formed on the other surface. A screw hole 36 for the bolt 35 is formed in the longitudinal direction, and a concave portion 37 in which the head of the bolt 35 is immersed is formed at an end of the screw hole 36.

The wedge holder 40 has a substantially boat shape, and has a substantially rectangular parallelepiped insertion portion 4 inserted into the mounting hole 31.
1 and a substantially triangular prism-shaped protrusion 4 protruding from the mounting hole 31
And 2. The adjacent side surface (inclined surface) 42a of the protruding portion 42 has a parallelogram shape, and the pointed tip of the protruding portion 42 is located on the inner side of the rotation path of the It is connected to the side. Further, a through hole 44 for the bolt 43 is formed in the protrusion 42 so as to be orthogonal to the longitudinal axis of the wedge holder 40.

Further, the mounting hole 31 is provided on one surface of the insertion portion 41.
An arc-shaped contact surface 45 is formed in contact with the inner peripheral surface of the wedge 32, and an inclined surface 46 is formed on the other surface so as to be in contact with the inclined surface 34 of the wedge 32. The two inclined surfaces 3
Reference numerals 4 and 46 are for moving the wedge holder 40 in the radial direction of the mounting hole 31 and pressing the wedge holder 40 against the inner peripheral surface of the mounting hole 31.

Further, a notch 47 having a V-shape in plan view is formed at the tip end of the contact surface 45 of the insertion portion 41.
7 and the crushing blade 2 having a square shape in a plan view
One seating portion 48 is formed. On the base end side of the inclined surface 46 of the insertion portion 41, a ridge portion 49 with which the tip portions of the two bolts 35 of the wedge 32 abut is formed.

Then, the bolt 43 inserted into the through hole 44 of the projection 42 is screwed into the screw hole 21a of the crushing blade 21,
The crushing blade 21 is detachably mounted on the seat 48 so that two adjacent side surfaces of the crushing blade 21 protrude from the outer peripheral surface of the crushing rotor 22. The crushing blade 21 attached to the seat 48
Are located in the radial direction of the crushing rotor 22. That is, it is perpendicular to the outer peripheral surface of the crushing rotor 22.

In addition, the wedge holder 40 has a mounting hole 31 formed so as to be gradually displaced in the circumferential direction along the rotation axis direction of the outer peripheral surface of the crushing rotor 22 (cylindrical body 23).
Is inserted into. Moreover, the plurality of crushing blades 21 have a saw blade shape in plan view when the crushing rotor 22 rotates. The crushing blade 21 is provided with a crushing rotor 22.
Are shifted in the rotational direction toward the end.

The pressing / supplying means 55 includes side plates 2a, 2a.
b, a pressing plate 56 arranged from the vicinity of the opening input section 3 to the crushing chamber 10 and rotatably supported by the side plates 2a and 2b, and bringing the pressing plate 56 into and out of contact with the crushing rotor 22. And a swing cylinder 57 for swinging in the direction.

The pressing plate 56 is formed by bending a single flat plate into a substantially U-shape when viewed from the side, and has a plurality of substantially U-shaped reinforcing ribs 58 on the back side (opposite to the crushing rotor 22). The brackets 5 are attached in parallel with an interval, and are provided on both sides of the surface of the bent one side 56a (opening opening 3 side).
9, 59 are fixed, and the brackets 59, 59 are supported by pins on the side plates 2a, 2b.

The other side 56b bent (crushing chamber 1)
A plurality of guide plates 60,... Are fixed at regular intervals in the width direction (axial direction on the side of the crushing rotor 22).

When the oscillating cylinder 57 is extended, the pressing plate 56 is inclined such that one side 56a extends on the side of the opening insertion section 3 of the path communicating with the opening insertion section 3 and the crushing chamber 10. While the other side approaches the crushing rotor 22 and swings to a position where the crushing chamber 10 side contracts to a substantially vertical state while the oscillating cylinder 57 is contracted, one side 56a crushes the path. The chamber 10 is substantially vertically extended so as to expand, and the other side 56b is separated from the crushing rotor 22 and swings to a position where it is inclined to extend the crushing chamber 10. Therefore, as the swing cylinder 57 expands and contracts from the extended state to the contracted state, the path is gradually expanded from the opening input section 3 to the crushing chamber 10.

The lower end of the other side 56b of the pressing plate 56 is
It is substantially L-shaped, is bent to the side opposite to the path, and the plate body of the reinforcing frame 15 facing the path is also curved such that the lower end follows along with the swing. Therefore, the pressing plate 5
Due to the swing of 6, a part of the crushing object or dust does not deviate from the path.

The edge of the reinforcing frame 15 along which the lower end of the pressing plate 56 extends is substantially flush with the upper surface of the fixed blade 30, so that the swing cylinder 57 contracts and the reinforcing frame 15 The crushing object falling on the top is the swing cylinder 5
7 is smoothly guided to the crushing rotor 22 side by the pressing of the pressing plate 56 due to the extension of 7.

A screen 65 is provided below the crushing rotor 22. The screen 65 includes a crushing blade 2
1 has a number of circumferential grooves 66,... Having a V-shaped cross section similar to the shape of the tip, and is curved in an arc shape of about 1/4 in the direction of rotation of the crushing rotor 22 from the fixed blade 30. The crushing blade 21 is disposed so as to have a small gap toward the tip of the crushing blade 21.

The circumferential grooves 66 of the screen 65 are:
As shown in FIGS. 4A to 4C, the crushing blades 21,... Pass through the circumferential grooves 66,. The side wall of the circumferential groove 66 is formed facing the side surface adjacent to the tip of the crushing blade 21, and the circular groove 66 has a plurality of circular discharge holes 67 for discharging the crushed material to be crushed. Are aligned and formed.

Then, a minute gap is formed according to the shape of the tip of the crushing blade 21. Further, the surface area of the screen 65 is increased and the discharge holes 67 are increased by 1.4 times, so that the aperture ratio of the screen 65 is increased as compared with the conventional screen in which a flat plate is curved in an arc shape. And the material to be crushed is easily discharged out of the crushing chamber 10.

By appropriately setting the size of the discharge hole 67 of the screen 65, the object to be crushed can be crushed to a desired size. That is, the crushed material that can pass through the discharge hole 67 is discharged to the outside through the discharge hole 67, and the crushed material having a size that cannot pass through the discharge hole 67 is caused by the rotation of the crushing rotor 22. Along the inner surface of the screen 65, it is returned to the crushing chamber 10 again.

Further, a discharge hopper 70 is provided on the discharge side of the screen 65, that is, below the discharge hopper 70 for storing the crushed material discharged from the discharge hole 67 of the screen 65. The discharge hopper 70 has a cyclone 71 and a blower. 72 is connected by a pipe (not shown), and the crushed material contained in the discharge hopper 70 is sucked by the suction action of the blower 72,
The sucked material to be crushed is collected by the cyclone 71.

Therefore, the crushed material discharged from the screen 65 does not return to the crushing chamber 10 even if it is a light crushable material such as paper, and is efficiently discharged.

Next, the manner of use of the crushing apparatus of the present invention configured as described above will be described. First, in a state in which the pressing plate 56 of the pressing and supplying means 55 is separated from the crushing rotor 22, the crushed object is charged into the crushing chamber 10 from the opening input portion 3, and then the oscillating cylinder 57 is operated, The rod 57 is extended to move the pressing plate 56 toward the crushing rotor 22, and the material to be crushed is pushed by the pressing plate 56 and sent toward the crushing rotor 22, and is pressed against the surface of the crushing rotor 22 by the pressing plate 56. Crushing rotor 22 and fixed blade 3
Feed to the crushing position between 0.

The material to be crushed sent to the crushing position is partially sheared and crushed by a shearing action in a minute gap between each crushing blade 21 attached to the crushing rotor 22 and the fixed blade 16, while the screen 65 is crushed. Because it is close to the crushing blade 21,
The material to be crushed rotates along the screen 65 so as to be pushed out on the front surface of the crushing blade 21 and is pushed out to the discharge hole 67. When the diameter of the discharge hole 67 is 20 mm, it is crushed to a particle size of about 20 mm. .

Thereafter, the finely crushed material is accommodated in the discharge hopper 70, sucked by the blower 72, and collected by the cyclone 71.

Further, even if the crushing rotor 22 is rotated at a high speed in order to increase the crushing efficiency, the cooling water W is passed through the crushing rotor 22 through the water supply passage 25, the water jacket 27, and the drain passage 26. The heat accumulated in the crushing rotor 22 is taken away by the cooling water W, so that the crushing rotor 22 is cooled, so that the temperature increase of the crushing rotor 22 can be avoided and the temperature increase of the crushing blade 21 can be suppressed.

As described above, according to the crushing apparatus according to the present embodiment, by cooling the crushing rotor 22, it is possible to prevent the occurrence of a fire due to a rise in the temperature of the crushed object and the melting of the waste plastic.

The flow path for cooling the crushing rotor 22 is an annular concave portion formed on the inner peripheral surface of the cylindrical body 23. It may be formed on at least one of the outer peripheral surfaces.

Furthermore, instead of the recess, a flow path formed in at least one of the axial direction, the radial direction, and the circumferential direction of the cylindrical body 23 and the shaft body 24 may be used.

Further, the shaft 24 and the cylindrical body 23 having an inner diameter larger than the outer diameter of the shaft 24 are integrated, and a flow path of the cooling water W is formed between the shaft 24 and the cylindrical body 23. You may do so.

In addition, the flow path of the cooling water W formed in the crushing rotor 22 may be formed so as to be located near the crushing blade 21 to cool the crushing blade 21.

Next, a procedure for attaching and replacing the crushing blade 21 will be described. First, when the crushing blade 21 is attached to the mounting hole 31 of the crushing rotor 22, the crushing blade 21 is seated on the seating portion 48 of the wedge holder 40, and the bolt 43
Is inserted into the through hole 44 of the projection 42 and screwed into the screw hole 21 a of the crushing blade 21, and the crushing blade 21 is mounted on the wedge holder 40. Next, the inclined surface 46 of the wedge holder 40 is brought into contact with the inclined surface 34 of the wedge 32 and combined, and in this state, the insertion portion 41 of the wedge holder 40 and the wedge 3
2 is inserted into the first insertion portion 31a of the mounting hole 31.

When the bolt 35 of the wedge 32 is tightened, the tip of the bolt 35 comes into contact with the projection 49 of the wedge holder 40, and the wedge 32 is moved to the wedge holder 4.
It moves to the thick part side along the 0 inclined surface 46. Therefore,
The wedge holder 40 moves in the radial direction of the mounting hole 31, the contact surface 45 of the wedge holder 40 presses against the inner wall of the mounting hole 31, and the wedge holder 40 is fixed to the mounting portion 31.

At this time, two adjacent side surfaces of the crushing blade 21 are provided with the second insertion portion 31 b of the mounting hole 31 and the escape portion 3.
1c, and the adjacent two side surfaces on the other side protrude from the outer peripheral surface of the crushing rotor 22. That is, the triangular shape on one side in a plan view fits into the second insertion portion 31b and the relief portion 31c of the mounting hole 31 with the diagonal of the crushing blade 21 interposed therebetween, and the triangular shape on the other side in the plan view is the outer peripheral surface of the crushing rotor 22. From the state.

Next, when the crushing blade 21 is damaged and worn, and the crushing blade 21 is to be replaced, the bolt 43 of the wedge holder 40 is replaced.
To remove the crushing blade 21 from the seating portion 48 and replace it with a new crushing blade 21. When the crushing blade 21 and the wedge holder 40 are damaged or worn, the bolt 35 of the wedge 32 is loosened, and the crushing blade 21
Of the second insertion portion 31b of the mounting hole 31 and the escape portion 3
1c and the mounting hole 31 together with the wedge holder 40.
The crushing blade 21 is removed from the seating portion 48 by loosening the bolt 43 of the wedge holder 40, and the new crushing blade 2 is removed.
Replace with 1.

Although the inclined surface 46 is formed on the wedge holder 40, it may be a flat surface. In short, the shape of the wedge holder 40 is such that the wedge 32 is removably inserted into the attachment hole 31, the crushing blade 21 is detachably attached, and the wedge 32 is provided between the wedge holder 40 and the inner peripheral surface of the attachment hole 31. Any shape that can be fitted may be used.

The shapes of the fitting member and the blade holder are as follows.
It is sufficient that at least one of the members has an inclined surface for radially moving the blade holder.

However, when attaching the crushing blade 21,
It is desirable that the crushing blade 21 is attached to be orthogonal to the outer peripheral surface of the crushing rotor 22.

Furthermore, although the shape of the tip of the crushing blade 21 is rectangular in plan view, the shape is not limited to this and may be circular. In addition, the side surface adjacent to the crushing blade 21 having a square shape in plan view protrudes from the outer peripheral surface of the crushing rotor 22, but the two corners of the crushing blade 21 having square shape in plan view are separated from the outer peripheral surface of the crushing rotor 22. You may make it protrude. However, in this case, the circumferential groove 66 of the screen 65 is
It is necessary to correspond to the shape of the tip of the first.

The cooling structure for the crushing blade 21 and the crushing rotor 22 and the detachable mounting structure for the crushing holder 40 can of course be applied to a crushing rotor having a conventional circumferential groove. Needless to say, the present invention can be applied to an existing screen in which a flat plate having a plurality of discharge holes is curved in an arc shape.

[0058]

As described above, the crushing apparatus of the present invention uses a screen having a plurality of circumferential grooves having a shape similar to the shape of the tip of the crushing blade. The number of discharge holes formed in the screen increases, and the aperture ratio of the screen increases. Moreover, the screen is arranged so that the tip of the rotating crushing blade passes through the circumferential groove of the screen, so that the crushed material is easily discharged out of the crushing chamber, which is effective for improving the discharge efficiency. It is.

Further, the crushed material discharged from the discharge hole of the screen below the screen can be collected by the cyclone, and the discharge efficiency can be further improved.

[Brief description of the drawings]

FIG. 1 is a cut-away side view of a crusher showing one embodiment of the present invention.

FIG. 2 is a cut-away plan view of FIG. 1;

FIG. 3 is an enlarged sectional view of the crushing rotor of FIG.

FIG. 4 (a) is an enlarged plan view of the screen of FIG. 1,
(B) is a cut front view of FIG. 4 (A), and (C) is FIG. 4 (B)
FIG.

5 shows a partial cross section of the crushing rotor of FIG. 1 and shows a state in which a blade holder of the crushing blade is fixed by a fitting member.

FIG. 6 is a front view of a mounting structure portion of the crushing blade of FIG. 5;

FIG. 7 is a plan view of a mounting structure of the crushing blade of FIG. 5;

FIG. 8 is a schematic configuration diagram in which a cyclone is connected to a crushing device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Crushing apparatus, 10 ... Crushing chamber, 21 ... Crushing blade, 22 ... Crushing rotor, 30 ... Fixed blade, 65 ... Screen, 66 ... Circular groove, 67 ... Discharge hole, 70 ... Discharge hopper, 71 ... Cyclone, 72 ... Blowers.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4D065 CA16 CB01 CC01 DD05 DD18 DD26 EB11 EB14 ED15 ED24 4D067 EE13 EE19 EE22 GA11 GA16 GB03

Claims (4)

[Claims] 1. A rotatable crushing rotor (22) having a plurality of crushing blades (21,...) Inside a crushing chamber (10) for accommodating a crushed object, and a crushing rotor (22) facing the crushing rotor (22). And fixed blades (30) arranged in the direction of rotation, and the shearing blades (21,...) And the fixed blades (30) shear in the rotation direction of the crushing rotor (22) from the fixed blades (30). A discharge hole (6) for discharging the crushed material to the outside of the crushing chamber (10).
7) In a crushing device provided with a screen (65) on which a plurality of pieces are formed, the screen (65) has a plurality of circumferences having a shape similar to the shape of the tip of the crushing blade (21,...). Grooves (66,...) Are formed and the screen (6) is formed.
5), the rotating crushing blades (21,...)
…) A crushing device characterized by being disposed so as to pass through the inside. 2. A circumferential groove (6) of said screen (65).
Are formed in parallel with each other in the axial direction of the crushing rotor (22), and the crushing blades (21,...) Of the crushing rotor (22) correspond to the respective circumferential grooves (66). The crushing device according to claim 1, wherein the crushing device is disposed. 3. A tip of the crushing blade (21,...) Has a V-shape, and a circumferential groove of the screen (65) is opposed to a side surface adjacent to a tip of the crushing blade (21,...). (6
The crushing device according to claim 1 or 2, wherein the side walls of (6, ...) are formed. 4. A discharge hopper (70) is provided on the discharge side of the screen (65) for accommodating the crushed material discharged from a discharge hole (67) of the screen (65). 4. The crushing device according to claim 1, wherein a cyclone (71) for collecting the crushed material by the suction action of the blower (72) is connected to the crushing device.