JPH0679670B2 - Roller mill - Google Patents

Description

TECHNICAL FIELD The present invention relates to a roller mill for crushing cement raw materials, clinker, slag, coal, etc., and more particularly to a roller mill in which a rolling surface of a crushing table is composed of a plurality of liners. It is a thing.

[Conventional technology]

Conventionally, the structure of the liner used for the rolling surface of the crushing table of the roller mill has been formed into a fan shape that is the easiest to divide.

12 to 14 are explanatory views of a roller mill using a conventional liner.

A crushing table 23 is provided in the body of the roller mill, and the raw material is crushed between the crushing rollers 22 on the upper side while constantly rotating.

The crushing roller 22 is rotatable around a shaft 24 and can be rolled by the rotation of the crushing table 23. Therefore, when the raw material is sandwiched between the crushing roller 22 and the crushing table 23 and subjected to compression crushing or friction crushing, a strong force is applied to the surface of the crushing table, so that the surface liner 25 is made of high hardness cast iron or the like.

The liner 25 on the surface has a fan shape with the circumference divided into 12 and is clamped one by one by a clamp plate 26.

The liner 25 with the divided rolling surface has the simplest fan shape, and is 15 ° to the left and right with respect to the center line X passing through the center O.
It fits line G of. This is because it is the easiest to make, but because of that, it is exactly aligned with the axis of the crushing roller 22, and when the crushing table 23 rotates and the dividing line G overlaps directly under the crushing roller 22, the dividing line G The crushing roller 22 generated a vertical shock due to a gap formed or a step difference due to the uneven thickness of the adjacent liner 25, which was a vibration source.

[Problems to be solved by the invention]

A liner made of high-hardness cast iron or the like has conventionally been a vibration source because the roller is shocked and intermittent due to a gap formed by the dividing line or a step between adjacent dividing liners. Also, the noise was high and I was in trouble.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a roller mill having a liner that solves such problems and that the dividing line does not become a vibration source of the roller.

[Means for solving problems]

In order to achieve this object, the present invention has the following configuration.

That is, in a roller mill for crushing a raw material between a crushing table having an annular rolling surface composed of a plurality of liners and a crushing roller rolling under pressure on the rolling surface, the rolling surface and the crushing The gap formed with the roller is increased or decreased in the radial direction of the annular rolling surface, and the dividing line formed by the liner adjacent to the rolling surface is such that the minimum position of the gap is the last. In the direction in which the crushing roller passes, the configuration is inclined with respect to the center line passing through the center of the annular rolling surface. Further, it is desirable that the gap be narrowed toward the outer peripheral portion of the crushing table.

[Action]

According to the above-mentioned means of the present invention, since the dividing line formed by the liners adjacent to the rolling surface is inclined with respect to the center line passing through the center of the annular rolling surface, the crushing roller rolls. When passing through the step between the liners while rolling on the surface, the direction of the step does not coincide with the axis of the crushing roller, and the step gradually passes through the crushing action surface of the crushing roller, resulting in no impact of the step. Will be alleviated.

Further, the gap between the rolling surface and the crushing roller is increased or decreased in the radial direction of the annular rolling surface, and the minimum position of the gap where the crushing force is most generated is the direction in which the crushing roller finally passes.
Since the line of division of the liner is inclined with respect to the axis passing through the center of the ring-shaped rolling surface, it will pass through the step between the liners sequentially from the part with a small grinding force to the part with a large grinding force.
The impact of the step will be further alleviated.

〔Example〕

 The present invention will be described below with reference to the drawings of the embodiments.

1 to 7 are explanatory views of a liner according to the present invention.

In the body of the roller mill, there is a crushing table 1 which constantly rotates in a horizontal direction, and this crushing table is formed with an annular rolling surface composed of a plurality of liners. The raw material is sandwiched between the crushing roller 2 and crushing roller 2. It should be noted that the term "annular rolling surface" does not mean that it is geometrically only a perfect circle, but it also includes a substantially circular shape such as a polygonal ring.

Since the crushing roller 2 is rotatable around the shaft 3 and is rotated by the crushing table 1, the crushing roller 2 and the raw material entering the crushing table 1 are sandwiched and crushed, so that the liner 4 on the surface is high. Hardness cast iron etc. are used.

The liner 4 on the surface has a shape similar to a fan shape in which the circumference is divided into 12 (the number of divisions is not limited), and the liners 4 are stopped by the clamp plates 5 one by one.

Further, the divided liner 4 has radiations E and F passing through the center O.
Divided by dividing lines H and I that are shifted to the left by 15 ° with respect to
12 sheets fill the circumference exactly.

The liner 4 thus divided operates as follows.

First, it is assumed that the crushing table 1 rotates in the direction of the arrow shown in the figure, that is, in the clockwise direction.

Since the crushing roller 2 does not change its place, the dividing lines H and I passing directly below the axis 3 on the radial line are faster on the inner peripheral side and slower on the outer peripheral side. Therefore, the entire dividing line does not simultaneously overlap the axis of the crushing roller 2.

With such a configuration, even when the rotation direction of the table 1 is reversed, the order of passing directly under the shaft 3 of the roller 2 is reversed, and one entire dividing line is simultaneously rotated along the axis of the roller 2. The large shack is avoided because it does not overlap.

4 and 5 show another embodiment of the present invention.

Radiation F'where the dividing line (8 divisions) of the liner 10 passes through the center O
On the other hand, the curve gradually expands from a certain angle θ. Also in this case, the shaft 12 of the crushing roller 11 and the entire one dividing line do not overlap at the same time.

FIG. 6 and FIG. 7 also show another embodiment, in which the dividing line of the liner 15 is bent halfway from a line inclined at an angle θ with respect to the radiation F ″ passing through the center O.

In this case also, in the liner 15 divided into 12 parts, the shaft 17
Therefore, even if there is a step on the liner 15, a large shock can be avoided because the entire dividing line does not overlap at the same time.

Next, a case of a roller mill in which the gap formed between the ring-shaped rolling surface of the crushing table and the rolling crushing roller increases or decreases in the radial direction of the ring-shaped rolling surface will be described.

The rotating crushing table 1 shown in FIGS.
The position Y where the distance between the surface liners 4 and 10 and the crushing rollers 2 and 11 is minimum is on the circumferential line closest to the outer peripheral side.

In this case, when the crushing table 1 is rotated to the right as shown in the drawing, it is desirable that the inner peripheral side of the dividing line also quickly passes immediately below the pulverizing roller and the outer peripheral side becomes slow. Therefore, on the contrary, in the case of counterclockwise rotation, it is better to bend the decomposition line in the opposite direction as shown by the chain line, so that the liners 6 and 13 should be used.

In FIGS. 6 and 7, the location Z where the distance between the surface liner 15 and the crushing roller 16 is minimum is on the circumferential line passing through the center.
It is desirable to construct the point so that it passes the point immediately below the axis 17 of the roller 16. Further, as shown by the chain line, in the case of counterclockwise rotation, the liner 18 having the opposite shape may be used.

In this way, the grinding rollers 2, 11, 16 and liners 4, 10, 15 and 6,
A large gap between 13,18 passes directly under the roller shafts 3,12,17 first, and then gradually moves to a place Y, Z where the gap is smallest, so there is a step on the split liner side. Even if it does, the rollers 2, 11 and 16 do not fall at a time.

The liner 4 is fixed to the crushing table 1 by a clamp plate 5 having a wedge-shaped cross section as shown in FIGS. 1 and 2.
Is usually fixed by pushing with a bolt 27 between the liner and the grinding table. However, in the case of a geometrically perfect circular ring-shaped rolling surface, when the bolt is loosened, the liner 4 starts to move within the ring-shaped rolling surface of the grinding table 1, and the width of the dividing line between the liners increases. Things can form and cause vibration. Therefore, in fixing the liner 4 to the crushing table 1, it is desirable to provide not only a simple wedge-shaped clamp plate, but also a concave-convex engaging portion that engages with each other between the liner 4 and the crushing table. FIG. 8 shows an example in which the liner 4 and the clamp plate 5 correspond to each other in a one-to-one relationship, and the uneven engaging portion 28 is provided in the central portion thereof. FIG. 9 shows an example in which the clamp plate 5 is mounted over the two liners 4, and an uneven engaging portion 28 is provided on the dividing line of the liner and in the center of the liner. FIG. 10 shows an example in which the uneven engaging portion 28 is provided between the liner 4 and the outer peripheral side that holds the rolling surface of the crushing table 1. FIG. 11 is a combination of FIG. 8 and FIG. By providing the uneven engagement portion between the liner 4 and the clamp plate 5 and / or the crushing table, it is possible to completely prevent the liner 4 from moving within the annular rolling surface of the crushing table 1.

〔The invention's effect〕

As described above, according to the present invention, the dividing line of the liner of the annular rolling surface is moved in the direction in which the minimum position of the gap increased or decreased in the radial direction of the annular rolling surface is finally passed by the crushing roller. Since it is inclined with respect to the axis passing through the center, when the grinding roller rolls on the rolling surface and passes through the step between the liners, the direction of the step does not match the axis of the grinding roller, and the grinding force is small. It will pass through the step between the liners sequentially from the part to the larger part. Therefore, it is possible to significantly reduce the impact of the step, and as a result, it is possible to reduce vibration and noise pollution, which have been problems in the related art.

[Brief description of drawings]

1 is a plan view of a crushing table showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, FIG. 3 is an enlarged view of the liner of FIG. 1, and FIG. FIG. 5 is a plan view of a crushing table showing another embodiment of the invention, FIG. 5 is a sectional view taken along line BB in FIG. 4,
FIG. 6 is a plan view of a crushing table showing another embodiment of the present invention, FIG. 7 is a sectional view taken along the line CC of FIG. 6, FIG. 8, FIG.
10 and 11 are plan views of the crushing table showing the liner mounting state, FIG. 12 is a plan view of the conventional crushing table, and 13
12 is a sectional view taken along the line DD of FIG. 12, and FIG. 14 is an enlarged view of the liner of FIG. 1,23 …… Crushing table 2,11,16,22 …… Crushing roller 3,12,17,24 …… Shaft 4,10,15,25 …… Liner 5,26 …… Clamp plate

Claims (2)

[Claims] 1. A roller mill for crushing a raw material between a crushing table having an annular rolling surface composed of a plurality of liners and a crushing roller rolling under pressure on the rolling surface, the rolling surface comprising: The gap formed between the crushing roller and the crushing roller is increased or decreased in the radial direction of the annular rolling surface, and the dividing line formed by the liner adjacent to the rolling surface is the minimum position of the gap. The roller mill is characterized in that it is inclined in a direction in which the crushing roller finally passes with respect to a center line passing through the center of the annular rolling surface. 2. The roller mill according to claim 1, wherein the gap becomes narrower toward the outer peripheral portion of the crushing table.