JPS6129483Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a crusher rotor.

As is well known, a shear pulverizer is provided with a pair of fixed blades in opposing parts of a pulverizing chamber surrounded by a casing, and a rotor having a cutting edge on its outer periphery facing the fixed blades is rotatably shafted in the pulverizing chamber. Plastic scraps and industrial waste materials such as runners, films, pipes, and molded products are input through the material input port of the crushing chamber, and the materials are crushed using the shearing force acting between the fixed blade and the rotor. It crushes.

In such a crusher, in order to allow the rotor to rotate freely, a slight gap is provided between the end surface of the rotor in the crushing chamber and the inner surface of the side wall of the crushing chamber opposing the end surface. Therefore, input materials and crushed materials may enter the gap, and film-like materials in particular may become entangled with the rotor, slide against the inner surface of the side wall, become hot, melt, and enter the bearing, potentially damaging the bearing. It was hot. In addition, crushed materials and the like that have entered the gap create frictional resistance, causing overload on the rotor drive system.

The present invention was devised in view of the above-mentioned problems, and aims to provide a rotor for a crusher that can quickly discharge crushed materials that have entered between the end face of the rotor and the inner surface of the side wall of the crushing chamber. purpose.
Therefore, the characteristic feature is that the rotor rotatably provided in the crushing chamber has cutting edges on its outer periphery at predetermined intervals in the circumferential direction, and the outer end surface of the cutting edges in the rotor axis direction is aligned with the rotor axis. The blade edge faces the inner surface of the side wall of the grinding chamber perpendicular to the core direction with a predetermined gap, and the outer end surface of the cutting edge in the rotor axis direction is arranged such that the gap gradually increases from the front to the rear in the rotor rotation direction The point is that a relief surface is provided on the side.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

What is shown in FIGS. 1 and 2 is the overall structure of the crusher main body. In the figures, the crusher main body has a casing consisting of an upper body 1 and a lower body 2. A grinding chamber 3 having a circular cross section is formed at the joint of the grinding chamber 3, and the upper part of the grinding chamber 3 is an upwardly opening inlet 4, and a hopper 5 extends above the inlet 4. The upper body 1 and the lower body 2 are firmly overlapped by a pair of fastening mechanisms 6, and the lower body 2 can be opened and closed with respect to the upper body 1 via a hinge mechanism 7.

A pair of fixed blades 8 are fastened to the joint surface of the upper body 1 and the lower body 2 with bolts 9, and the blade edges of the fixed blades 8 extend into the crushing chamber 3 and extend over the entire length of the crushing chamber 3. It is set up. The pair of fixed blades 8 can be moved forward and backward in the radial direction of the crushing chamber 3 by adjusting bolts 10, and the amount of protrusion in the radial direction thereof can be adjusted.

The lower body 2 is equipped with a screen 11 having a semicircular cross section, and this screen 11 constitutes the bottom surface of the grinding chamber 3. A large number of holes 12 are perforated in the screen 11. The screen 11 can be removed by rotating the lower body 2 relative to the upper body 1.

13 is a rotor, and the rotor 13 is composed of a main shaft 14 and a rotary blade 15. The main shaft 14 is inserted through the center of the grinding chamber 3, and both ends of the main shaft 14 are attached to bearings 17 in bearing cases 16 provided at both ends of the grinding chamber 3.
It is rotatably mounted on an axis via. One end of the main shaft 14 protrudes outward from the bearing case 16, and a pulley 18 is fixed to the protrusion. Power from a drive motor (not shown) is transmitted to this pulley 18 via a belt or the like.

The rotary blades 15 are provided on the main shaft 14 in the crushing chamber 3 at predetermined intervals in the circumferential direction (in the illustrated example, at three locations) over the entire length of the crushing chamber 3 . The rotary blade 1
5 has a rectangular flat plate shape as shown in FIGS. 3 to 5, and is fixed to the main shaft 14 with a bolt 19.
The cutting edge 20 of the rotary blade 15 projects radially outward from the outer periphery of the main shaft 14, and its protruding amount is adjusted by an adjustment bolt 21 so as to have a predetermined gap with the cutting edge of the fixed blade 8.

As shown in FIG. 6, the outer end surface of the rotary blade 15 in the rotor axial direction faces the inner surface of the crushing chamber side wall 22, which is orthogonal to the rotor axial direction, with a predetermined gap therebetween. In the illustrated example, the end face of the bearing case 16 constitutes the side wall 22. On the outer end surface of the rotary blade 15,
Relief surface 23 whose gap with the inner surface of side wall 22 gradually increases from the front to the rear in rotor rotation direction a
is formed. The relief surface 23 has an angle α with respect to the side wall 22.

According to the above embodiment of the present invention, the plastic waste inputted into the crushing chamber 3 from the hopper 5 through the input port 4 is transferred to the rotary blade 1 by the rotation of the rotor 13.
5 and the fixed blade 8, and the finely pulverized material falls down through the screen 11. At this time, these crushed materials enter the gap between the outer end surface of the rotary blade 15 and the inner surface of the side wall 22, but the rotary blade 1
5 A relief surface 23 is provided on the outer end surface, and the rotation direction a
Since the gap becomes wider toward the rear, the intruder b remains in the gap and is discharged rearward without rotating together with the rotary blade 15. Therefore, there is no possibility that the intruder b will get stuck in the gap and cause an overload, and there is no risk that the intruder b will slide into contact with the side wall 22 and become hot and melt, so that the bearing 17 is
There is no risk of infiltration of elutriates.

It should be noted that the present invention is not limited to the above embodiments, and the rotor may be of a mammoth type or an open flat type.

According to the present invention, since the relief surface is provided on the outer end surface of the cutting edge of the rotor facing the inner surface of the side wall of the grinding chamber, intruders are easily discharged without remaining between the inner surface of the side wall and the outer end surface of the cutting edge. There is no overload on the rotor's rotational force, and there is no fear that intruders will enter the bearing, so it is highly effective in practical use.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is a cross-sectional view of the crusher main body, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, Fig. 3 is a front view of the rotary blade, and Fig. 4 is a cross-sectional view of the crusher main body. The figure is a sectional view taken along the line -- in FIG. 3, FIG. 5 is a sectional view taken along the line -- in FIG. 3, and FIG. 6 is a sketch showing the relationship between the side wall and the flank. 3... Grinding chamber, 13... Rotor, 20... Cutting edge, 22... Side wall, 23... Flank surface.

Claims (1)

[Scope of utility model registration request] The rotor, which is rotatably provided in the grinding chamber, has cutting edges on its outer periphery at predetermined intervals in the circumferential direction, and the outer end surface of the cutting edges in the rotor axial direction is on the inner surface of the side wall of the grinding chamber orthogonal to the rotor axial direction. The blades face each other with a predetermined gap, and are characterized in that a relief surface is provided on the outer end surface of the cutting edge in the rotor axis direction so that the gap gradually widens from the front to the rear in the rotor rotational direction. The rotor of the crusher.