JPH0350580B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary crusher, and particularly to a rotary crusher with an improved mantle crushing surface.

[Conventional technology]

Conventionally, a rotary crusher is configured as shown in FIG. 3, for example.

In the figure, reference numeral 1 denotes an upper frame, which is connected to the upper part of a lower frame 2 placed on a pedestal (not shown). An inlet hopper 3 is provided at the top of the upper frame 1, which serves as an inlet for materials to be crushed (not shown) such as rough stones and rocks. A cone cave 4 in the shape of a truncated conical tube with a smooth curved surface is attached.

On the other hand, a sleeve 6 having an eccentric shaft hole 5 is rotatably fitted into the boss 2a of the lower frame 2, and a main shaft 7 is rotatably inserted into the eccentric shaft hole 5 of the sleeve 6. The lower end of the main shaft 7 is supported by a lower bearing (not shown) such as a thrust bearing. The upper end of the main shaft 7 is supported by an upper bearing 8 such as a radial spherical bearing, and the upper bearing 8 is supported by a plurality of arms 9 provided on the upper frame 1. A truncated conical mantle 11 is attached to the main shaft 7 via a mantle core 10.
The mantle 11 forms a crushing chamber 12 together with the cone cave 4, and its outer peripheral surface is formed into a smooth curved surface.

On the other hand, a driven bevel gear 13 is attached to the lower end of the sleeve 6 through which the main shaft 7 is inserted, and a driving bevel gear 15 attached to the inner end of the horizontal rotating shaft 14 is meshed with the driven bevel gear 13. There is. Horizontal rotation axis 1
4 is a casing 16 attached to the lower frame 2
A pulley 18 is attached to the outer end of the horizontal rotating shaft 14 and is operatively connected to an electric motor (both not shown) via a belt.

In order to crush a material to be crushed by the rotary crusher having the above configuration, the electric motor is activated to rotate the sleeve 6, and the material to be crushed is introduced from the inlet hopper 3. As the sleeve 6 rotates, the lower end of the main shaft 7 makes an eccentric rotational movement due to the action of the eccentric shaft hole 5, and the mantle 11 also makes an eccentric rotational movement.
Due to the change in the gap between the inner circumferential surface of the mantle 11 and the outer circumferential surface of the mantle 11, the crushed products fall while being compressed and crushed, and are discharged from the lower part of the crushing chamber 12 through the outlet (not shown) of the lower frame 2 to the outside of the machine. It is discharged.

[Problem that the invention seeks to solve]

However, according to the conventional rotary crusher, the crushing surfaces of the cone cave and mantle are formed into smooth curved surfaces. It is easy to slide toward the larger gap between the two, and the crushing of the object is compression crushing between surfaces.
Requires relatively large power. Furthermore, since the material to be crushed naturally falls due to its own weight, short passes are likely to occur, which increases the particle size distribution width of the crushed product and reduces crushing efficiency.

Therefore, the present invention can prevent objects to be crushed from slipping, and can also prevent surface-to-surface compression crushing.
It is also an object of the present invention to provide a rotary crusher that can regulate the falling speed of objects to be crushed.

[Means for solving problems]

In order to solve the above-mentioned problems, the rotary crusher of the present invention has irregularities continuous in a wave shape in the circumferential direction formed on the crushing surface of the mantle so as to be diagonally downward and forward in the rotation direction of the mantle. It is.

[Effect]

The material to be crushed, which is placed in the crushing chamber between the cone cave and the mantle, is crushed at three points: the inner circumferential surface of the cone cave and the adjacent convex portions of the mantle crushing surface, with a part of the material entering the concave part of the mantle crushing surface. It is crushed by bending and shearing while the slippage is restricted due to the decrease in the gap between the cone cave and the mantle.

In addition, since the object to be crushed falls along the concave portion of the mantle fracture surface and receives a pushing force from the convex portion of the rotating mantle fracture surface, the falling speed is suppressed compared to the case of natural falling.

〔Example〕

Embodiments of the rotary crusher of the present invention will be described with reference to the drawings. In the following description, the same components as those in FIG. 3 are denoted by the same reference numerals, and the description thereof will be omitted.

FIGS. 1a and 1b are a plan view and a front view showing essential parts of a first embodiment of a rotary crusher according to the present invention.

In the first embodiment, unevenness 19 extending in a wave shape in the circumferential direction from the vicinity of the upper end to the vicinity of the lower end on the fracture surface of the mantle 11 extends forward in the turning direction of the mantle 11 (counterclockwise direction in FIG. 1a). It is formed to be inclined downward, and the recessed portion of the unevenness 19 is formed so that the lower end side gradually becomes wider.

When crushing a material to be crushed by the rotary crusher having the above configuration, a part of the material to be crushed, especially large lumps and highly hard materials, is crushed into mantle. When the cone cave has entered the concave part of the surface, it is pinched at three points: the inner peripheral surface of the cone cave 4 and the adjacent convex parts of the mantle fracture surface, and as the gap between the cone cave 4 and the mantle 11 is reduced, it is It is fractured by bending and shearing at three points with controlled slippage.

In addition, the object to be crushed falls along the concave portion of the mantle crushing surface and receives a pushing force from the convex portion of the rotating mantle crushing surface, so that the falling speed is suppressed compared to when it falls naturally.

FIGS. 2a and 2b are a plan view and a front view showing essential parts of a second embodiment of a rotary crusher according to the present invention.

The second embodiment differs in that the fractured surface of the mantle 11 is formed in a straight line in the first embodiment described above, whereas the fractured surface of the mantle 11 is formed in a concave curved line in the shape of an arc. Since the operation is the same as that of the first embodiment, the explanation thereof will be omitted.

〔Effect of the invention〕

As described above, according to the rotary crusher according to the present invention, the objects to be crushed are crushed by bending and shearing while the slippage is restricted, so that large chunks and highly hard objects can be crushed with relatively small power. Can be crushed. In addition, since the objects to be crushed fall along the concave portions of the mantle fracture surface and are pushed up by the convex portions of the rotating mantle fracture surface, the falling speed of the objects to be crushed is suppressed and the occurrence of short passes is reduced. , has the effect of dramatically improving crushing efficiency.

[Brief explanation of drawings]

FIGS. 1a and 1b are a plan view and a front view showing essential parts of a first embodiment of a rotary crusher according to the present invention,
FIGS. 2a and 2b are a plan view and a front view showing essential parts of a second embodiment of a rotary crusher according to the present invention, and FIG. 3 is a longitudinal sectional front view showing a conventional rotary crusher. 4... Corncave, 11... Mantle, 12
...Crushing chamber, 19...Unevenness.

Claims (1)

[Claims] 1. A rotating crusher characterized in that a mantle crushing surface is formed with corrugations that extend in the circumferential direction in a wave-like manner and are oriented obliquely toward the front and lower side in the rotation direction of the mantle.