JP2951608B2 - Rotary blade of twin-shaft crusher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary blade of a twin-screw crusher for continuously crushing various solid products by a shearing action.

[0002]

2. Description of the Related Art Conventionally, a biaxial shear crusher, which is a typical example of a shear crusher, has a drive shaft 21 and a driven shaft 22 juxtaposed at a fixed interval as shown in a longitudinal sectional view of FIG. On the drive shaft 21 and the driven shaft 22, a large number of rotary blades 23 alternately sandwich the spacer 24 in close contact with each other, and their side surfaces are closely wrapped with a small gap therebetween. They are lined up in a state. Since the rotary blade 23 of the shear crusher crushes various crushed objects such as metal pieces, plastics, and wood, the wear is intense and requires frequent replacement.
There is a problem that even if a part is lost, the whole must be replaced.

In order to solve this problem, Japanese Utility Model Publication No.
In Japanese Patent No. 31953 and Japanese Utility Model Publication No. 7-53712,
A blade support that is fitted to a drive shaft or a driven shaft, and a blade body that surrounds the blade support. The blade body is divided in a circumferential direction, and includes a plurality of blade body pieces that are detachably attached to the blade support. A rotary blade of a shear crusher is described. The blade piece is fixed by screwing two mounting bolts on the outer periphery from the radially outer side into the blade receiving base.

[0004]

Problems to be Solved by the Invention
In the case of Japanese Patent Publication No. 953, since the engagement between the blade piece and the blade cradle is made to be a concave-convex fit, a high processing accuracy is required for this fitted portion. However, this part is inferior in workability as compared with the plane part, so that it is difficult to obtain high accuracy. If the processing accuracy is poor, play is produced when the two are fitted, and the use environment is severe even with a small play, so that the service life of the rotary blade is significantly shortened.

In the Japanese Utility Model Publication No. 7-53712, a stepped protrusion is engaged on the blade receiving side and engaged with the blade side to transmit the rotational force of the shaft from the blade receiving base to the blade body. Since the step portion is formed at the end portion, the workability deteriorates because the step receiving portion and the blade body have the step-shaped uneven portion. Also,
The spacer is also divided into two parts, which are mounted on the shaft and connected to each other with bolts, which takes a lot of time and effort for installation.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a blade body which is provided between a blade pedestal and a blade piece facing each other with a spacer interposed therebetween. By assembling the pieces or the like, the mounting surface between the blade receiving base and the blade body piece is made a flat surface without unevenness, and the workability thereof is improved so as to prevent rattling during assembly.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a blade supporter having a rotary blade mounted on a shaft supported by a casing with a spacer interposed therebetween, the rotary blade being provided on the shaft, and a blade body portion surrounding the same. In a biaxial shearing crusher in which the blade body part is divided in the circumferential direction and formed into a plurality of blade body pieces, and each blade body piece is detachably provided on the blade cradle, a spacer is formed. On the side surfaces of the pair of blade body pieces and the blade cradle opposed to each other, an engagement recess is provided that straddles the blade body piece and the blade cradle, and an engagement groove connected to the engagement recess is formed in the outer peripheral axial direction of the spacer. And a rotating blade of a biaxial shearing crusher in which one engaging member is fitted into an engaging recess of a blade receiving base and a blade body piece facing an engaging groove of a spacer. As a result, since the rotational force of the shaft can be transmitted to the blade body even through the engaging member, the mounting surface between the blade receiving base and the blade body piece can be made a flat surface without unevenness, and good workability is secured. No backlash occurs during assembly.

In this case, if the engaging recess is circular, the engaging groove is semicircular, and the engaging member is a cylindrical pin, the structure can be simplified.

Further, if the cross section of the engaging portion of the engaging member with the spacer has a sectional shape that is flush with the outer peripheral surface of the spacer, the tip of the opposing rotary blade may hit the engaging member. Since there is no spacer, the arrangement can be made so that it can easily approach the outer peripheral surface of the spacer.

Further, if the blade receiving base and the spacer are fitted on the shaft having a rectangular cross section, the mutual positional relationship is fixed, so that the engaging concave portion and the engaging groove are accurately continuous, and the engaging member is fitted. Is assured.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a state in which a rotary blade 2 is attached to a shaft 1 having a rectangular cross section, and shows an exploded perspective view before attaching a blade piece 5 and a spacer 6 and the like. It is the side view which showed a part in cross section.

1 and 2, a drive shaft or driven shaft (hereinafter, simply referred to as "shaft") 1 having a rectangular cross section has a blade holder 3 having a regular hexagonal outer shape, and a spacer 6 having a circular outer shape. It is provided in between. The blade support 4 is provided with a blade body 4 surrounding its outer periphery. The blade body 4 is formed from a plurality of blade body pieces 5 divided in the circumferential direction. As will be described later, the blade pieces 5 are detachably attached to the outer peripheral surface 6 of the blade receiving base 3 by mounting bolts 11, respectively. In addition, the blade support 3 is not limited to a regular hexagon, but may be a regular polygon such as a regular octagon, and the number of the blade pieces 5 may be increased.

[0014] Opposite side face 3 of blade receiving base 3 and blade piece 5 facing each other
a and 5a are formed with semicircular recesses 8a and 8b, respectively, so that when they are assembled and integrated, a circular engaging recess 8 which straddles the blade receiving base 3 and the blade piece 5 is formed. It is supposed to be. On the other hand, an engagement groove 9 having a semicircular cross section connected to the engagement recess 8 is formed on the outer periphery of the spacer 6. An engaging member (pin) 7 is fitted into the engaging groove 9. The outer diameter of the spacer 6 is usually set to a diameter that can be accommodated in the blade cradle 3 (equal to the diameter of a regular hexagonal inscribed circle of the blade cradle 3 as shown in FIG. 1). The diameter may be slightly larger or smaller as long as the engagement recess 8 that extends over the body piece 5 is formed.

A mounting surface 3b between the blade receiving base 3 and the blade piece 5;
5b is a flat surface without irregularities or steps, and the joining surface 5c of the blade pieces 5 is also a flat surface. Since the rotational force of the shaft 1 can be transmitted from the blade receiving base 3 to the blade body 4 also by the engaging member 7 in addition to the mounting bolt 11, a step portion or an uneven portion is formed between the blade receiving base 3 and the blade body 4. This is because there is no need to engage with them. If it is a flat surface, the workability will be very good, so that the processing accuracy will also be improved, and no play will be seen between the blade holder 3 and the blade pieces 5 and between the blade pieces 5 during assembly.

Here, while explaining the procedure for mounting the rotary blade, the configuration will be further extended.

A pair of blade supports 3 are mounted on both sides of the shaft 1 having a rectangular cross section with the spacer 6 interposed therebetween. At this time, the semicircular engagement groove 9 of the spacer 6 and the semicircular recess 8a of the blade receiving base 3 are connected to form a continuous groove. In this case, the spacer 6 and the blade support 3
Is fitted on the shaft 1 having a rectangular cross section, the mutual positional relationship is fixed, so that the engaging groove 9 and the concave portion 8a are reliably connected.

A cylindrical engaging member 7 is fitted into the continuous groove. Next, the blade piece 5 is mounted so that the engaging member 7 fits into the recess 8 b of the blade piece 5, whereby the positioning and fixing of the blade piece 5 in the circumferential direction are performed. Then, two mounting bolts 11 are inserted from the mounting holes 10 and screwed into the blade receiving base 3 to fix the blade body pieces 5. In this manner, the blade body pieces 5 are attached to the six surfaces of the blade support 3 respectively. Then, as described above, the shaft 1
The rotary blades 2 are mounted one after another with the spacer 6 interposed therebetween.

In the illustrated example, the engaging member 7 having a circular cross section protrudes from the outer peripheral surface 6a of the spacer 6. However, as shown in FIG. 3, it does not protrude from the outer peripheral surface 6a of the spacer. Such a cross section (semicircular, semielliptical, etc.) may be used. In this case, as shown in FIGS.
It is preferable that both ends of B be rectangular 7a or elliptical 7b to secure the engagement depth at the spacer portion. Reference numeral 7c denotes a surface which is flush with the outer peripheral surface 6a (virtual line) of the spacer. Then, as shown in FIG. 3 (c), the tip of the blade body piece 5 of the rotating blade facing the
Since it does not hit the engaging members 7A and 7B, the shear crushing action at this portion can be effectively exerted as close as possible to the outer peripheral surface 6a of the spacer.

[0020]

The present invention is embodied in the form described above and has the following effects.

The rotational force of the shaft can be transmitted to the blade body from the blade cradle by means of an engaging member in addition to the mounting bolt, so that there is no need to engage the blade cradle and the blade body with steps or uneven portions. Therefore, the mounting surface between the blade receiving base and the blade body piece can be a flat surface having no irregularities or steps, and the joining surface between the blade body pieces can also be a flat surface. As a result, the workability is extremely good, so that the processing accuracy is also improved, and no play is observed during assembly, so that the life of the rotary blade is greatly improved.

In this case, if the engaging recess is circular, the engaging groove is semicircular, and the engaging member is constituted by an engaging member having a circular cross section, the structure can be simplified.

In addition, if the cross section of the engaging portion of the engaging member with the spacer has a cross-sectional shape that is flush with the outer peripheral surface of the spacer, the tip of the opposed rotary blade may hit the engaging member. Since there is no spacer, the arrangement can be made so that it can easily approach the outer peripheral surface of the spacer.

Thus, the shear crushing function between the tip of the rotary blade and the outer peripheral surface of the spacer can be improved.

Further, if the blade support and the spacer are fitted on the shaft having a rectangular cross section, the mutual positional relationship is fixed, so that the engaging concave portion and the engaging groove are accurately connected, and the engaging member is fitted. As a result, the assemblability of parts can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state where a rotary blade is attached to a shaft;
FIG. 4 is an exploded perspective view before a blade piece, a spacer, and the like are attached.

FIG. 2 is a side view showing a part thereof in cross section.

FIGS. 3 (a) and 3 (b) show another embodiment of an engaging member, and FIG.
FIG.

FIG. 4 is a front view of a conventional twin-shaft crusher.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Shaft 2 ... Rotary blade 3 ... Blade support 4 ... Blade body 5 ... Blade body piece 6 ... Spacer 7, 7A, 7B ... Engagement member (pin) 8 ... Engagement concave part 9 ... Engagement groove

Claims (4)

(57) [Claims] 1. A rotary blade is mounted on a shaft supported by a casing with a spacer interposed therebetween, and the rotary blade is divided into a blade receiving base provided on the shaft and a blade body portion surrounding the same. In a biaxial shearing crusher in which a blade portion is divided into a plurality of blade pieces in a circumferential direction, and each blade piece is detachably provided on a blade cradle, a pair of blades opposed to each other with a spacer interposed therebetween. On the side surface of the body piece and the blade receiving base, an engaging recess is provided to extend over the blade body piece and the blade receiving base, and an engaging groove connected to the engaging concave portion is provided in the outer peripheral axis direction of the spacer. A rotary blade of a biaxial shearing crusher in which a member is fitted into a blade receiving base opposed to an engagement groove of a spacer and an engagement recess of a blade body piece. 2. The fixing member according to claim 1, wherein the engaging concave portion extending over the blade piece and the blade receiving base is circular, the engaging groove on the outer periphery of the spacer is semicircular, and the engaging member is constituted by a cylindrical pin. Rotary blade of twin-shaft crusher. 3. The rotation of the biaxial shearing crusher according to claim 1, wherein a cross section of an engaging portion of the engaging member with the spacer has a cross section that is flush with an outer peripheral surface of the spacer. blade. 4. The rotary blade of a biaxial shearing crusher according to claim 1, wherein the rotary blade has a rectangular cross section, and a blade support and a spacer are fitted to the shaft.