JPS631101B2 - - Google Patents

Description

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

[Conventional technology]

Conventionally, a rotary crusher is configured as shown in FIGS. 4 and 5, 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 M to be crushed such as rough stones and rocks. A cone cave 4 in the shape of a truncated conical tube 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 has a straight outer circumferential surface serving as a crushing 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 the material M with the above-described rotary crusher, the electric motor is activated to rotate the sleeve 6, and the material M is
Insert. As the sleeve 6 rotates, the lower end of the main shaft 7 eccentrically rotates due to the action of the eccentric shaft hole 5, and the mantle 11 similarly eccentrically rotates, and the crushed material M falling into the crushing chamber 12 is crushed into a cone cave. Due to the change in the gap between the inner peripheral surface of the mantle 4 and the outer peripheral surface of the mantle 11, the mantle falls while being compressed and crushed one after another.
The crushed products are discharged from the lower part of the crushing chamber 12 to the outside of the machine through a discharge port (not shown) of the lower frame 2.

[Problem that the invention seeks to solve]

However, in the conventional rotary crusher, the crushing surfaces of the cone cave 4 and the mantle 11 forming the crushing chamber 12 are formed in straight lines as shown in FIG. Since the angle of view) is set constant, there are the following problems.

(1) It is necessary to adjust the entrance gap of the crushing chamber 12 to the maximum side length of the object M to be crushed, so as the object M to be crushed becomes a large lump, the length of the crushing chamber 12 increases, and the size of the machine body increases. Bring about shape.

(2) Since the material to be crushed M is crushed in the thickness direction of the material to be crushed, as shown by the solid line in FIG. The area is mainly used for reversing the object M to be crushed,
Crushing is concentrated in a region 1/2 to 2/3 of the length from the lower end of the crushing chamber 12, which tends to cause overcompression, resulting in overload and inoperability. For this reason, in large block crushing, the crushing ratio cannot exceed 4 to 6. At the same time, as shown by the dashed line in Fig. 5, the cone cave 4
Also, 1/2 to 2/3 of the lower end of the mantle 11 is locally worn, resulting in a decrease in the life span and yield of the cone cave 4 and the mantle 11.

SUMMARY OF THE INVENTION Therefore, the present invention aims to provide a rotary crusher that can reduce the length of the crushing chamber and that can disperse crushing over almost the entire lengthwise area of the crushing chamber. be.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the rotary crusher of the present invention has the crushing surface of the mantle shaped into a circular arc or a circular arc so that the inclination angle gradually increases from above to below. The cone cave is formed by a series of close straight lines, and the fracture surface of the cone cave opposing this is formed by a straight line that slopes inward and a circular arc that extends at the lower end and bulges in the middle, or a series of straight lines close to the circular arc, and both fracture surfaces The nip angle formed by the cone cave is constant in the straight part of the cone cave and decreases continuously from the top to the bottom in the curved part.

[Effect]

The material to be crushed is placed in the crushing chamber formed between the cone cave and the mantle so that the thickness direction is in the vertical direction in the area corresponding to the straight line part of the cone cave (inverted area). While being supported by the sloped surface formed by the mantle, the mantle turns in the longitudinal or width direction due to the eccentric rotational movement of the mantle and slides down the slope, so that the thickness direction becomes horizontal and the area corresponding to the curved part of the cone cave ( effective crushing area). The material to be crushed introduced into the effective crushing area of the crushing chamber is designed to decrease as the nip angle goes downward, so it is repeatedly crushed and fallen in the entire lengthwise area, resulting in The crushed products are smoothly discharged from the lower end of the crushing chamber without being compressed.

〔Example〕

An embodiment of the rotary crusher of the present invention will be described with reference to FIGS. 1 and 2. In the following description, the same components as those in FIG. 4 are denoted by the same reference numerals, and the description thereof will be omitted.

In this embodiment, the fracture surface of the mantle 11 is
It is formed by a series of circular arcs or straight lines close to circular arcs so that the inclination angle (the inclination angle of the fracture surface with respect to the vertical plane) gradually increases from the top to the bottom. Furthermore, the crushing surface of the cone cave 4 that faces the mantle 11 and forms the crushing chamber 12 is about 40~
It is formed by a straight line that slopes inward (to the left in Figure 1) at an angle of 45 degrees, and a circular arc or a continuous straight line close to a circular arc that continues at the lower end of this straight line and bulges out in the middle. The nip angle formed by the fracture surfaces of the mantle 11 and the cone cave 4 is kept constant in the range of approximately 50 to 55 degrees in the region (inversion region) 12a corresponding to the straight line portion of the cone cave 4 in the fracture chamber 12, and In the area (effective crushing area) 12b corresponding to the curved portion, the crushing area is continuously decreased from the top to the bottom.

The shape of the effective crushing area 12b of the crushing chamber 12 and the reduction of the nip force are determined by the passing volume of the effective crushing area 12b at each crushing stage (curve A in FIG. 2).
The change in volume of the cumulative particle size (shown by curves B and C in FIG. (shown by curve D).

When crushing the material M to be crushed by the rotary crusher having the above configuration, the crushing chamber 1 is
The material to be crushed M put into 2 is 1 in Fig. 1.
As shown by the dotted and dashed lines, the inversion region 1
2a, the mantle 11 changes direction in the longitudinal direction or width direction and slides down on the inclined surface while being supported by the inclined surface formed by the straight portion of the cone cave 4 so that the thickness direction is the vertical direction. , as shown by the solid line in FIG. 1, is introduced into the effective crushing area 12b so that the thickness direction is in the horizontal direction.

Here, in the effective crushing area 12b, both crushing surfaces are formed by a circular arc or a series of straight lines close to a circular arc, in order to make the passing volume of this area at each crushing stage correspond to the volume change of the cumulative particle size of the material M to be crushed. , and the nip angle formed by both fracture surfaces decreases as it goes downward. Therefore, the object M introduced into the upper part of the effective crushing area 12b is repeatedly crushed and dropped in the entire lengthwise area of the effective crushing area 12b, without causing an over-compression state. The crushed products are smoothly discharged from the lower end of the crushing chamber 12.

Corncave 4 and Mantle 11 according to the above operation
The fracture surface is worn almost uniformly over the entire vertical direction in the effective fracture area 12b, as shown by the dashed line in FIG.

In addition, when the crushing ratio is increased under the operating conditions of the same horsepower and the rotary crusher of the above embodiment and the conventional rotary crusher with the same mantle diameter, the processing capacity is as follows. As shown by curves A and B in Figure 3, the conventional rotary crusher becomes overloaded and becomes inoperable when the crushing ratio exceeds 6, but the rotary crusher of the embodiment It was found that stable operation was possible even when the crushing ratio was increased to 12.

〔Effect of the invention〕

As described above, according to the rotary crusher of the present invention,
An inversion area is formed at the entrance of the crushing chamber, and the object to be crushed is inverted in this inversion area, so even when crushing large pieces of material as in the conventional technology, the length of the crushing chamber can be reduced. There is no need to increase the size, and the aircraft can be made smaller. In addition, an effective crushing area is formed that is connected to the reversal area, and the object to be crushed is repeatedly crushed and fallen in the entire length direction of this effective crushing area, in other words, the object to be crushed is crushed. Since the compression is distributed over almost the entire length of the chamber, there is no possibility of over-compression.
The crushing ratio can be increased to 8 to 12, stable operation can be performed, and life and yield can be significantly improved due to uniform wear.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the rotary crusher of the present invention, with Figure 1 being a front view of the main parts, Figure 2
The figure is an explanatory diagram of the relationship between the passing volume at each crushing stage of the effective crushing area and the volume of cumulative particle size. Figure 3 is a diagram explaining the comparison of the processing capacity of the present invention with respect to the conventional technology.
Figure 5 shows a conventional rotary crusher.
FIG. 4 is a longitudinal sectional front view, and FIG. 5 is a front view of the main parts. 4... Corncave, 11... Mantle, 12
... Crushing chamber, 12a... Inversion area, 12b... Effective crushing area.

Claims (1)

[Claims] 1 The fractured surface of the mantle is formed by a series of circular arcs or straight lines close to circular arcs so that the angle of inclination gradually increases from the top to the bottom, and the fractured surface of the cone cave opposing this is formed by a straight line that slopes inward and continues at its lower end. and a circular arc bulging in the middle or a series of straight lines close to circular arcs, and the nip angle formed by both fracture surfaces is constant in the straight part of the cone cave and continuously decreases from the top to the bottom in the curved part. A rotary crusher characterized by: