JPS61263656A - Agitation type crusher - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 crushing chamber formed between a cone cape and a mantle. .

[Conventional technology]

Conventionally, a rotary crusher is constructed 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 cape 4 in the form 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 2α of the lower frame 2, and a main shaft 7 is rotatably inserted through 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 two-sial spherical bearing. It 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. Mantle 11
1 forms a crushing chamber 12 together with the Mayuki concave 4, and the outer surface serving as the crushing surface is formed in a straight line.

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.
A driving bevel gear 15 attached to the inner end of the horizontal rotating shaft 14 is meshed with it. The horizontal rotating shaft 14 is supported by a casing 16 attached to the lower frame 2 via a bearing 1, and an electric motor (
A pulley 18 is attached which is operatively connected to the motor (both not shown).

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 introduced from the inlet hopper 3. As the sleeve 6 rotates, the lower end of the main shaft 7 eccentrically rotates due to the action of the eccentric shaft hole 50, and the mantle 11 similarly rotates eccentrically. Due to the change in the gap between the inner circumferential surface and the outer circumferential surface of the mantle 11, the pieces fall while being compressed and crushed one after another, and the crushed products are discharged from the lower part of the crushing chamber 12 through the discharge port (not shown) of the lower frame 2 to the outside of the machine. is discharged.

[Problem that the invention seeks to solve]

However, in the conventional rotary crusher, the crushing surfaces of the cone cape 4 and the mantle 11 forming the crushing chamber 12 are formed in one straight line as shown in FIG. Since the angle (pinch angle) is set at a constant value, there are the following problems (1) It is necessary to adjust the entrance gap of the crushing chamber 120 to the maximum side length of the object M to be crushed. As the mass becomes larger, the length of the crushing chamber 12 increases, resulting in an increase in the size of the machine body.

(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. It is used for reversing the object M to be crushed, and is
Fractures are concentrated in a region with a length of 72 to 273, which tends to cause overcompression, resulting in overload and inoperability. For this reason, in crushing large blocks, the crushing ratio cannot exceed 4-6. At the same time, as shown by the dashed line in FIG. 5, the portions 172 to 273 from the lower ends of the cone cape 4 and mantle 11 are locally worn, resulting in a decrease in the life span and yield of the cone cape 4 and mantle 11. is bringing.

Therefore, the present invention seeks 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. It's a turtle.

[Means for solving problems]

In order to solve the above problems, the rotary crusher of the present invention has the following features:
The fractured surface of the mantle is formed by a circular arc or a series of straight lines close to circular arcs so that the inclination angle gradually increases from the top to the bottom, and the fractured surface of the cone cape opposite to this is formed by a straight line that slopes inward and its lower end. It is formed by a series of circular arcs that bulge out in the middle or a series of straight lines close to circular arcs, and the nip angle formed by both fractured surfaces is constant in the straight part of the cone cape and continuous from the top to the bottom in the curved part. This has been reduced to .

[For production]

The material to be crushed is placed in the crushing chamber formed between the cone cape and the mantle, and is crushed so that the thickness direction is in the vertical direction in the region corresponding to the straight line part of the cone cape (inverted region). While being supported by the slope formed by the straight part of the mantle, the mantle turns in the longitudinal or width direction and slides down the slope so that the thickness direction is horizontal and the curve of the cone cape is formed. It is introduced into the area corresponding to the part (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 that it is repeatedly crushed and fallen in the entire lengthwise area. The crushed products are smoothly discharged from the lower end of the crushing chamber without causing an overcompression state.

〔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 fractured surface of the mantle 11 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 fractured surface with respect to the vertical plane) gradually increases from the top to the bottom. Furthermore, the crushing surface of the cone cape 4 that faces the mantle 11 and forms the crushing chamber 12 is a straight line that is inclined to the inside II (to the left in FIG. 1) at an angle of about 40 to 45 degrees with respect to the horizontal direction. It is formed by a circular arc that connects to the lower end of this straight line and bulges out in the middle, or a series of straight lines that are close to circular arcs. The nip angle formed by the crushing surfaces of the mantle 11 and the cone cape 4 is kept constant in the range of about 50 to 55 degrees in the area (inversion area) 12α corresponding to the straight line part of the cone cape 4 in the crushing chamber 12. , the area corresponding to the curved part of cone cape 4 (effective crushing area)
126, it is continuously decreased from the top to the bottom.

The shape of the effective crushing area 12b of the crushing chamber 12 and the decrease in the two-y angle are such that the passing volume of the effective crushing area 12b at each crushing stage (indicated by curve A in FIG. 2) is Particle size and particle size of the crushed material M (second
This is to correspond to the change in volume of the cumulative particle size (indicated by a curved line in FIG. 2), which is a composite of the curves B and C in the figure.

When the material to be crushed M is crushed by the rotary crusher having the above configuration, the material to be crushed M input into the crushing chamber 12 from the inlet hopper (not shown) is as shown by the one-dot chain line and the two-dot chain line in FIG. In the reversal region 12g, while being supported by the inclined surface formed by the straight line portion of the cone cape 4 so that the thickness direction is the vertical direction, the direction is changed in the longitudinal direction or width direction by the eccentric rotation movement of the mantle 11, and the inclined surface is formed. It slides down from above and is introduced into the effective crushing area 126 with the thickness direction being in the horizontal direction, as shown by the solid line in FIG.

Here, in the effective crushing area 126, 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 material to be crushed M introduced into the upper part of the effective crushing area 126 is sequentially crushed and dropped in the entire lengthwise area of the effective crushing area 126, and is not over-compressed in the crushing chamber. The crushed product is smoothly discharged from the lower end of 12.

The crushed surfaces of the cone cape 4 and the mantle 11 due to the above operation are worn almost uniformly over the entire vertical direction in the effective crushing area 126, 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 FIG. 3, the conventional rotary crusher becomes overloaded and becomes inoperable when the crushing ratio exceeds 6, but the rotary crusher of the embodiment The crusher has a crushing ratio of 12
It was found that stable operation can be achieved even if the value is increased to 1.

〔Effect of the invention〕

As described above, in the rotary crusher of the present invention, an inversion area is formed at the entrance of the crushing chamber, and the material to be crushed is inverted in this inversion area. Even when crushing crushed materials, there is no need to increase the length of the crushing chamber, and the machine body can be made smaller. In addition, an effective crushing area is formed that is continuous with the reversal area, and the object to be crushed is repeatedly crushed and fallen in order in the entire area in the length direction of this effective crushing area. It is carried out dispersedly over almost the entire lengthwise area of the
Since there is no over-compression, the crushing ratio can be increased to 8 to 12, stable operation can be achieved, and the life and yield can be greatly improved due to uniform wear. has.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the rotary crusher of the present invention. Figure 1 is a front view of the main parts, and Figure 2 shows the passing volume at each crushing stage in the effective crushing area. Fig. 3 is a comparative illustration of the processing capacity of the present invention with respect to the conventional technology. Fig. 4 and Fig. 5 show the conventional rotary crusher. The figure is a longitudinal sectional front view, and FIG. 5 is a front view of main parts. 4... Corn cape 11... Mantle 12...
・Crushing chamber 12cL...Reversal area 126...
Effective crushing area

Claims (1)

[Claims] The fractured surface of the mantle is formed by a circular arc or a series of straight lines close to a circular arc so that the angle of inclination gradually increases from above to below, and the fractured surface of the cone cape, which faces this, is formed by a straight line that slopes inward and a series of straight lines at its lower end. and a circular arc that bulges in the middle or a series of straight lines close to circular arcs, and the nip angle formed by the two fractured surfaces is constant in the straight part of the cone cape and continuously decreases from the top to the bottom in the curved part. A rotary crusher characterized by