JPH0244857Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a screen device for a pulverizer that pulverizes objects to be pulverized, such as plastic processing waste and defective molded products.

(Prior Art) A conventional shear crusher is disclosed in, for example, Japanese Utility Model Publication No. 61-29479. This includes a casing 40 forming a crushing chamber 41 as shown in FIG.
It includes a rotary blade 42 rotatably supported by a casing 40 so as to be located in a crushing chamber 41, and a screen 44 arranged in an arc shape along the tip trajectory of the rotary blade 42.

A plurality of particle size adjustment holes 43 are formed in the screen 44 for discharging pulverized material of a predetermined particle size from the grinding chamber 41.

(Problem to be solved by the invention) However, since the particle size adjustment hole 43 is provided so that its axis 45 coincides with the radial direction of the screen, the pulverized material is transferred to the screen 4 by the rotating blade 42.
4, even if it is a long object to be crushed, if its outer diameter is less than the particle size adjustment hole 43, the object to be crushed will easily enter the particle size adjustment hole 43 and be discharged. It was.

In order to prevent the discharge of this long material to be crushed, it is possible to make the particle size adjustment hole 43 smaller, but if this is done, clogging will easily occur, and it will be over-pulverized and become fine particles. A problem arises in that the crushing operation cannot be performed.

In view of the above-mentioned conventional problems, the present invention makes it difficult for long materials to be crushed to enter the particle size adjustment hole without making the particle size adjustment hole smaller, and reduces the discharge of crushed materials with a predetermined particle size or more. Another object of the present invention is to provide a screen device for a crusher that can perform suitable crushing operations.

(Means for solving the problems) The technical means used by the present invention to achieve the above object are as follows.

Upper and lower casings 7a, 7 joined so as to be openable and closable
A crushing chamber 11 is formed by b, and this crushing chamber 11
A rotary blade 20 is rotatably provided therein, and a screen 10 is provided in the lower casing 7b in an arc shape along the tip locus of the rotary blade 20, and this screen 10 extends in the circumferential direction from the upper opening of the lower casing 7b. In the screen 10, in which a plurality of particle size adjustment holes 31 are formed, the axis 32 of the particle size adjustment holes 31 extends from the inner surface of the screen 10 toward the outer surface. 10
The inner surface of the lower casing 7b is recessed in the upper part of the lower casing 7b at one end in the circumferential direction of the screen 10, so that the inner surface of the lower casing 7b is recessed. An open take-out space 28 is formed between the screen 10 and the screen 10, and a take-out piece 29 located within the take-out space 28 is protruded from the screen 10.

(Operation) The material to be crushed 25 put into the hopper 5 is crushed by the fixed blade 8 and the rotary blade 20 in the crushing chamber 11, and a predetermined material to be crushed passes through the particle size adjustment hole 31 of the screen 10. The elongated object 25' to be crushed comes into contact with the circumferential surface on the entrance side of the particle size adjustment hole 31, and is difficult to enter into the particle size adjustment hole 31. Therefore, the object to be crushed 25' is long.
is rarely discharged, but is carried around by the rotating blade 20 along the screen 10, and the crushed material
5' is crushed again by the double blades 8 and 20.

Further, the long object to be crushed 25' is inserted into the particle size adjustment hole 31.
This reduces the possibility of clogging. Furthermore, when cleaning the screen 10, the upper casing 7
The screen 10 can be removed from the upper opening of the lower casing 7b by opening the opening a and turning the screen 10 in the circumferential direction. The screen 10 can be taken out easily by grasping the take-out piece 29 located inside the screen 28, and when installing the screen 10, it is necessary to take out the screen 10 from the side where the take-out piece 29 is not provided. By attaching the screen 10 with the operation shown in FIG. Therefore, the screen 10 cannot be completely installed, so the screen 10 is installed in the opposite direction in the circumferential direction so that the particle size adjustment holes 31 are aligned in the rotational direction of the rotary blade 20 (i.e., the object to be crushed 25 There is no risk that the material will be inclined in the direction in which the material is easily discharged.

(Example) Embodiments of the present invention will be described in detail with reference to the drawings.

1 to 9 show a first embodiment in which the present invention is applied to a shear crusher, in which reference numeral 1 denotes a portable frame equipped with wheels 2, and a crushed material storage container 3 is provided.
Reference numeral 4 indicates a crushing section placed on the pedestal 1, 5 a hopper, and 6 a drive mechanism.

The crushing unit 4 includes a casing 7, a fixed blade 8, a rotor 9 rotatably supported by the casing 7,
It mainly consists of a screen 10.

The casing 7 consists of an upper casing 7a and a lower casing 7b, which are joined to each other by a horizontal shaft 14 and a clamp bolt 15 so as to be openable and closable around the horizontal shaft 14. A grinding chamber 11 is formed by the upper and lower casings 7a and 7b, and the grinding chamber 11 is provided with an input port 12 at its upper portion and an outlet port 13 at its lower portion.

The fixed blade 8 is located at the joint between the upper and lower casings 7a and 7b, and is attached to the lower casing 7b with a mounting bolt 17 so as to face the crushing chamber 11. 18
is a fixed blade adjustment bolt.

The rotor 9 includes a rotor body 19 and a rotary blade 20.
It is equipped with The rotor main body 19 is located at the joint between the upper and lower casings 7a and 7b, and has bearings 21 and 2.
1, and is rotated in the direction of arrow A shown in FIGS. 1 and 2 by a drive mechanism 6 via a pulley 22 and a belt 23.

A rotary blade attachment portion 24 is recessed in the rotor body 19 in the longitudinal direction parallel to the axis, and a holding portion 26 is formed at the front portion of the attachment portion 24 in the rotational direction. The holding portion 26 is a notch in the rotor main body 19 in the longitudinal direction so that an appropriate amount of the object 25 to be crushed can be held therein.

The rotary blade 20 is attached to a rotary blade attachment part 24 with a mounting bolt 27 and is located within the crushing chamber 11. Two rotary blades are provided in the longitudinal direction of the rotor body 19, and the crushing phases are shifted so that the load does not act on the fixed blade 8 at once. That is, Figure 7~
As shown in FIG. 9, the cutting edge 20a of the rotary blade 20
is formed to be gradually lower than the joint part 20b with respect to the rotary blade attachment part 24, so that the cutting edge 20a of the rotary blade 20 is on the outer peripheral surface of a cylinder centered on the rotational axis of the rotor body 19. , is inclined so as to proceed in the direction opposite to the rotation direction from both ends toward the center from the rotation axis direction. 20c
is a rotary blade adjustment bolt.

The screen 10 is detachably attached to the lower casing 7b so as to form the bottom of the crushing chamber 11. The screen 10 is formed in an arc shape along the trajectory of the tip of the rotary blade 20, and both ends of the screen 10 in the axial direction are built over an arc-shaped step portion 7c formed on the inner surface of the side wall of the lower casing 7b. One circumferential edge of the screen 10 is in contact with the fixed blade 8, and the other edge is in contact with the lower surface (joint surface) of the upper casing 7a.

28 is a screen take-out space, where screen 1
0 is provided on the upper part of the lower casing 7b on the other edge side in the circumferential direction. The extraction space 28 is formed between the screen 10 and the lower casing 7b by recessing the inner surface of the front wall thereof so as to open on the upper surface. In the longitudinal direction midway of the extraction space 28,
Screen contact portion 16 that contacts screen 10
is installed protrudingly. Reference numeral 29 denotes a take-out piece that projects from the screen 10 so as to be located within the screen take-out space 28. The upper surface of this take-out piece 29 is flush with the upper surface of the screen 10, and is in contact with the lower surface of the upper casing 7a.

A plurality of particle size adjustment holes 31 are formed in the screen 10. As shown in FIG. 1, the axis 32 forms a certain angle θ from the inner surface to the outer surface of the screen 10 in the opposite direction to the rotation direction A of the rotary blade 20 with respect to the radius B of the inner surface of the screen 10. It has a slope. This angle θ is omitted in this example.
30° is suitable.

In the above embodiment, the material to be crushed 2 is placed in the hopper 5.
5, the object to be crushed 25 is held in the holding part 26 by the rotary blade 20 and crushed by the fixed blade 8 and the rotary blade 20. At this time, since the object to be crushed 25 is sheared with a phase shift, the double-edged blades 8, 20
In addition, since the cutting edge 20a is inclined, the object 25 to be crushed tends to be moved toward the center in the axial direction of the rotor 9 when sheared, and acts on the upper and lower casings 7a and 7b. The force is also reduced, and the material to be crushed 25 that has been fused by heat is less likely to flow into the bearing 21 side. Particle size adjustment hole 31
The crushed material that has been crushed into smaller pieces is passed through the screen 10.
It is discharged from the particle size adjustment hole 31 when being carried around along the particle size adjustment hole 31. Even if the elongated material to be crushed 25' tries to enter the particle size adjustment hole 31, since the axis 32 of the particle size adjustment hole 31 is inclined in the direction opposite to the direction of rotation of the rotary blade 20, the entrance of the particle size adjustment hole 31 is blocked. It comes into contact with the side circumferential surface and is difficult to pass through the particle size adjustment hole 31.

When removing the screen 10, the upper casing 7a side is opened around the horizontal axis 14, the removal piece 29 is pinched, and the screen 10 can be easily removed while rotating in its circumferential direction.

10 and 11 show a second embodiment of the present invention, in which two sets of rotary blades 20 are provided in the longitudinal direction of the rotor 9, and the phases of each set are shifted in the circumferential direction. The screen contact portions 16 are provided at two locations in the longitudinal direction of the rotor 9. This contact portion 16 is formed along the outer peripheral surface of the screen 10 as shown by the imaginary line C in FIG. 2, and firmly holds the screen 10. Particle size adjustment holes 31 are not provided at a location D corresponding to the contact portion 16 of the screen 10. Therefore, even if the screen 10 becomes clogged, the screen 10 can be easily taken out.
To increase the capacity for cleaning and maintenance of the screen 10.

FIG. 12 shows a third embodiment of the present invention, which has a structure in which the screen contact portion 16 is not provided on the lower casing 7b, and the take-out pieces 29, 29 directly contact the lower casing 7b.

In the above embodiments, the rotor rotates around the horizontal axis, which is applied to a shear crusher. It may be adopted in a crusher having a structure that rotates around an axis.

(Effect of the invention) In the present invention, the axis 32 of the particle size adjustment hole 31 is inclined in the direction opposite to the rotation direction of the rotary blade 20 with respect to the radius B of the screen 10 from the inner surface side to the outer surface side of the screen 10. Therefore, even if the particle size adjustment hole 31 is not made small, the elongated material to be crushed 25' having a predetermined particle size or more is difficult to be discharged.

Further, the long object to be crushed 25' is inserted into the particle size adjustment hole 31.
Since it is difficult to enter, clogging with the elongated object 25' to be crushed is less likely to occur, and a suitable crushing operation can be performed with less risk of over-pulverizing and creating fine particles. Furthermore, when cleaning the screen 10, the upper casing 7a is opened and the screen 10 can be removed from the upper opening of the lower casing 7b by turning it in the circumferential direction.
At that time, the screen 10 can be taken out by grasping the take-out piece 29 located in the take-out space 28 provided in the upper part of the lower casing 7b on one end side in the circumferential direction of the screen 10, and the screen 10 can be taken out easily. When installing, the screen 10 is prevented from being installed in the opposite direction in the circumferential direction by installing from the side where the take-out piece 29 is not provided, in the opposite direction to the above, and even if the take-out piece 29 is not provided, Screen 1 from the side being
0, but it cannot be completely installed due to the presence of the take-out piece 29. Therefore, the screen 10 is installed in the opposite direction in the circumferential direction so that the particle size adjustment holes 31 are aligned with the radial direction B of the screen 10. Therefore, there is no risk that the rotary blade 20 will be tilted in the direction of rotation of the rotary blade 20 (that is, the direction in which the material to be crushed 25' is easily discharged).

[Brief explanation of drawings]

Figures 1 to 9 show the first embodiment of the present invention, with Figure 1 being a sectional view of the main parts, Figure 2 being a side sectional view showing the inside of the crushing section, and Figure 3 being a plan view of the lower casing side. , Fig. 4 is a longitudinal sectional view of Fig. 2, Fig. 5 is an overall side view of the shear crusher, Fig. 6 is a rear view of the same, Fig. 7 is a front view of the rotary blade, and Fig. 8 is a plan view of the same. , FIG. 9 is a view taken along the - line in FIG. 7, FIGS. 10 and 11 show a second embodiment of the present invention, FIG. 10 is a plan view corresponding to FIG. 3, and FIG. 11 is a plan view corresponding to FIG. FIG. 12 is a longitudinal sectional view corresponding to FIG. 4, FIG. 12 is a plan view of the main part showing the third embodiment, and FIG. 13 is a sectional view of the main part showing the conventional example. 7...Casing, 10...Screen, 11
... Grinding chamber, 20 ... Rotating blade, 25 ... Object to be crushed, 31 ... Particle size adjustment hole, 32 ... Axis center, B ...
radius.

Claims (1)

[Scope of claim for utility model registration] Upper and lower casings 7a, 7 joined so as to be openable and closable
A crushing chamber 11 is formed by b, and this crushing chamber 11
A rotary blade 20 is rotatably provided therein, and a screen 10 is provided in the lower casing 7b in an arc shape along the tip locus of the rotary blade 20, and this screen 10 extends in the circumferential direction from the upper opening of the lower casing 7b. In the screen 10, in which a plurality of particle size adjustment holes 31 are formed, the axis 32 of the particle size adjustment holes 31 extends from the inner surface of the screen 10 toward the outer surface. 10
The inner surface of the lower casing 7b is recessed in the upper part of the lower casing 7b at one end in the circumferential direction of the screen 10, so that the inner surface of the lower casing 7b is recessed. A screen device for a crusher, characterized in that an open take-out space 28 is formed between the screen 10 and a take-out piece 29 protruding from the screen 10, which is positioned in the take-out space 28.