JPH035854B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a mantle for a rotary crusher such as a gear crusher or a cone crusher.

[Prior Art] The mantle of a rotary crusher works in conjunction with a cone cave to crush the material to be crushed. Conventionally, taking a gyratory crusher as an example, the mantle is configured as shown in Fig. 3. ing.

1 in the figure is the upper frame in the shape of a truncated inverted conical tube.
The upper frame 1 includes a plurality of (two in Fig. 3)
The frame 1a and 1b are arranged in series, and are arranged in series on the upper part of a lower frame 2 placed on a pedestal (not shown).

A sleeve 4 having an eccentric shaft hole 3 penetrating in the vertical direction is rotatably fitted into the boss portion 2a of the lower frame 2, and a sleeve 4 is rotatably inserted into the eccentric shaft hole 3. The lower end of the main shaft 5 is inserted through the main shaft 5. The lower end of the main shaft 5 is supported by a lower bearing 6 such as a thrust bearing.
is supported by a piston 8 of a hydraulic cylinder 7 for lifting and lowering the main shaft connected to the lower end of the boss portion 2a of the lower frame 2. The upper end of the main shaft 5 is supported by an upper bearing 9 such as a radial spherical bearing.
is the rim 10 attached to the upper end of the upper frame 1.
It is supported by a spider 11 that is integrated with.

The main shaft 5 has a truncated conical mantle core 12.
is integrally provided facing the inner peripheral surface of the upper frame 1, and a truncated conical mantle 13 made of high manganese cast steel is fitted into the mantle core 12. On the other hand, in order to form a cone cave 14 on the inner circumferential surface of the upper frame 1, a large number of cone cave segments 14a made of high manganese cast steel in the shape of an inverted trapezoid are arranged with appropriate clearances between each other and with a back-up material 15. They are installed in multiple rows and stages in a staggered pattern. A crushing chamber 16 having a wedge-shaped hollow cross section is formed between the cone cave 14 and the mantle 13.

A driven bevel gear 1 is attached to the lower end of the sleeve 4.
7 is attached to the driven bevel gear 17, and a driving bevel gear 19 attached to the inner end of the horizontal rotating shaft 18 is meshed with the driven bevel gear 17. The horizontal rotating shaft 18 is supported by a casing 20 attached to the lower frame 2 via a bearing 21, and an electric motor (both not shown) is connected to the outer end of the horizontal rotating shaft 18 via a belt. A pulley 22 is attached.

In order to crush an object to be crushed (not shown) with the gear crusher having the above configuration, the electric motor is activated to rotate the sleeve 4 and the crushing chamber 16 is rotated.
The material to be crushed is put into the As the sleeve 4 rotates, the lower end of the main shaft 5 makes an eccentric rotation movement due to the action of the eccentric shaft hole 3, and the object to be crushed falls while being compressed and crushed one after another due to the change in the gap between the cone cave 14 and the mantle 13. Then, it becomes a crushed product and goes to the crushing chamber 1.
6 and then fall and are discharged out of the machine from the discharge port of the lower frame 2.

[Problems to be Solved by the Invention] However, according to the above-mentioned conventional rotary crusher, the crushing surface of the mantle 13 is formed in a smooth conical shape. 14, it is easy to slip in the circumferential direction, the falling speed is high, and the number of shot passes increases, and the crushing time between the mantle 13 and the cone cave 14 of the object to be crushed,
Since the kneading time is shortened, there is a problem that the grain shape of the crushed product becomes flat.

In addition, when performing a chiyolk operation, since the crushing surface of the runtle 13 is formed into a smooth conical shape, the falling speed increases and the lower part of the crushing chamber 16 is likely to become overcrowded, so that a packing phenomenon occurs. In addition to being unable to operate stably,
Mantle 13, corn cave 14 due to uneven wear
There is a problem that the lifespan of the product is shortened.

SUMMARY OF THE INVENTION Therefore, the present invention aims to provide a mantle for a rotary crusher that improves the particle shape of crushed products, enables stable chuck operation, and extends the life of the crusher.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a mantle of a rotary crusher for crushing objects to be crushed in cooperation with a cone cave, in which an upper part is provided on the crushing surface of the mantle. A large number of grooves are formed at appropriate intervals in the circumferential direction, and the grooves become narrower from the top to the bottom, and are diagonally downward and forward in the direction of rotation of the mantle.

[Operation] According to the above means, the material to be crushed placed between the mantle and the cone cave is prevented from slipping in the circumferential direction with a part of the material entering the groove of the mantle, while being crushed on both sides of the groove. It is compressed and fractured by being sandwiched between the fractured surface of the mantle and the fractured surface of the cone cave.

Furthermore, the material to be crushed is guided by the grooves in the mantle that become narrower as the particle size gradually decreases due to the crushing, and falls in a spiral manner, so that the falling distance becomes longer and the falling speed is suppressed.

[Example] Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2.

FIGS. 1 and 2 are a half-cut plan view and a front view of the mantle of the tire retraction crusher, and the smooth fractured surface (outer peripheral surface) of the mantle 30 in the shape of a truncated conical tube made of high manganese cast steel. 31 has a large number of holes that become narrower from above to below in correspondence with the particle size of the material to be crushed that gradually decreases as it is crushed, and that are inclined forward and downward in the direction of rotation of the mantle 30 during crushing (in the direction of the arrow in the figure). grooves 32 are formed at appropriate intervals in the circumferential direction. Each groove 32 is provided from near the top to near the bottom of the mantle 30, and the groove width is set appropriately smaller than the grain size of the material to be crushed at the crushing stage, and the cross section of each groove 32 is as follows. It is provided in a V-shape, trapezoid shape, or other shape.

When the object to be crushed is crushed by the gear recycling crusher having the mantle 30 having the above configuration, a part of the object to be crushed is charged into the crushing chamber 34 between the mantle 30 and the cone cave 33 (see Fig. 2). The fracture surface 31 of the mantle 30 and the cone cave 3 on both sides of the groove 32 are prevented from slipping in the circumferential direction while entering the groove 32 of the mantle 30.
It is compressed and crushed by being sandwiched between the crushing surfaces of No. 3. Furthermore, when the spacing between the crushing chambers 34 widens due to the rotation of the mantle 30, the crushed material is guided by the groove 32 of the mantle 30, which becomes narrower in accordance with the gradual decrease in particle size due to the crushing, and falls in a spiral pattern. Therefore, the falling distance of the objects to be crushed becomes longer and the falling speed is suppressed.

[Effects of the Invention] As described above, according to the present invention, the following effects can be obtained compared to the prior art.

(1) A part of the material to be crushed enters the groove with a width corresponding to the particle size at the crushing stage, and slipping in the circumferential direction is prevented, so that crushing can be performed reliably.

(2) The object to be crushed is guided by the groove and falls in a spiral, the falling distance becomes longer, and the falling speed is suppressed, so the crushing time and kneading time for the object to be crushed are increased; As a result, flat crushed products are eliminated and the particle shape can be significantly improved.

(3) Also, since the falling speed of the material to be crushed is suppressed,
Together with the presence of the grooves, the material to be crushed is filled with appropriate voids in the crushing chamber, and stable cheese yoke operation is possible without causing packing phenomenon due to overcrowding in the lower part of the crushing chamber. Because there is less wear,
The lifespan of mantle and corn cave can be improved.

[Brief explanation of the drawing]

FIGS. 1 and 2 are a half-cut plan view and a front view of a mantle of a tire retractor according to an embodiment of the present invention, and FIG. 3 is a longitudinal sectional view of a conventional tire retractor equipped with a mantle. It is. 30... Mantle, 31... Fractured surface, 32...
Groove, 33... corn cave.

Claims (1)

[Claims] 1. In the mantle of a rotary crusher that works with a cone cave to crush materials, there are a number of holes on the crushing surface of the mantle that become narrower from the top to the bottom and are oriented diagonally forward and downward in the rotation direction of the mantle. groove,
A mantle for a rotary crusher characterized by being formed at appropriate intervals in the circumferential direction.