JP2003010710A - Pulverization method for simultaneously producing pulverized materials having different particle sizes and roller mill used in the pulverization method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] Even with a single roller mill having compact equipment, a raw material is pulverized and, at the same time, a product having a plurality of types of particle sizes is manufactured in a short time. SOLUTION: A rotary table 2 on which a raw material is placed and rotated in a vertical casing 4, a grinding roller 3 which is pressed against an upper surface of the rotary table 2 and driven to rotate, and a rotary table 2
And a plurality of substantially cylindrical separators 12 provided at a position above the rotary table 2 in order to classify the pulverized product pulverized by the pulverizing roller 3 into a plurality of particle sizes.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a cement raw material, blast furnace slag,
The present invention relates to a roller mill for crushing raw materials such as cement clinker and various chemicals, and particularly to a crushing method for simultaneously producing crushed products having different particle sizes and a roller mill used for the crushing method.

[0002]

2. Description of the Related Art Conventionally, as a roller mill for finely crushing raw materials such as limestone, slag, and cement raw material into powder, as shown in FIG. 4, a vertical type having a rotary table 2 and a pulverizing roller 3 is used. Roller mill 1 has been proposed.
In this type of vertical roller mill 1, a disk-shaped rotary table 2 which is driven at a low speed by a motor 5 at a lower portion of a substantially cylindrical casing 4 and rotates at a low speed, and an outer peripheral portion of an upper surface thereof is circumferentially or the like. It is provided with a plurality of crushing rollers 3 which are pressed against each other by a coil spring or hydraulic pressure and are driven to rotate.

Each crushing roller 3 has a stand 6 and a rotating shaft 7 attached thereto.
Is rotatably attached to an arm 8 which is rotatably supported in the vertical direction. By connecting a rod of a tension spring, the arm 8 presses the crushing roller 3 onto the rotary table 2 to apply crushing pressure to the raw material.

When manufacturing a product having a predetermined particle size by using such a rigid roller mill 1, the following method has been used. First, a certain amount of raw material is supplied from the raw material charging chute 9 to the central portion of the rotary table 2. This raw material receives a centrifugal force in the radial direction of the table due to the rotation of the rotary table 2 and slides on the rotary table 2 by the rotary table 2 in the direction of rotation, and slides between itself and the rotary table 2. Rotate somewhat slower than the number of revolutions of. The radial and rotational forces are combined on the rotary table 2, and the raw material moves to the outer peripheral portion of the rotary table 2 in a spiral path on the rotary table 2. Since a plurality of crushing rollers 3 are pressed against the outer peripheral portion of the crushing roller 3 and are rotating, the raw material in which the spiral is drawn enters between the crushing roller 3 and the rotary table 2 from a direction forming an angle with the roller axial direction. Then it is bitten and crushed.

Further, the crushing method is shown in FIGS. 5 (a) and 5 (b).
As shown in, the crushed product is taken out from the roller mill 1 as it is, conveyed by a feeder, divided into two or more kinds of products having a particle size by a classifier 10 and not returned to the same roller mill 1.
There is an open circuit crushing method (see FIG. 5 (a)). There is also a closed circuit crushing method in which the crushed material taken out from the roller mill 1 is passed through a classifier 10, the coarse particles in the product are returned to the roller mill 1, and only the fine particles are taken out (see FIG. 5 (b)).

[0006]

The crushing method using the conventional roller mill 1 described above can only produce a product having only one kind of particle size that can be produced at the same time. Therefore, when manufacturing products of two or more kinds of particle sizes using one roller mill 1, it is necessary to operate at different times, so contamination is likely to occur at the time of switching, and the product value is high. It has a problem that the value of is easily lowered. On the other hand, in order to prevent such contamination, many class machines 1 are installed in the latter stage.
Therefore, there is a problem that the apparatus required for the pulverization operation tends to be large in size.

[0007] Also, using one roller mill 1, 2
When manufacturing a product having more than one kind of particle size, there is a problem that the working time for switching the product tends to be long.

The present invention was devised to solve the above-mentioned problems. That is, it is an object of the present invention to crush raw materials and simultaneously produce products of plural kinds of particle sizes in a short time even with a single roller mill having compact equipment, and simultaneously produce pulverized products of different particle sizes. It is to provide a pulverizing method and a roller mill used for the pulverizing method.

[0009]

According to the method of the present invention,
The raw material is supplied onto a rotary table (2) which rotates around a vertical axis in a vertical casing (4), and the raw material is pressed by a pulverizing roller (3) to pulverize the pulverized product. Is classified into products of two or more kinds of particle sizes at the same time in the upper position in the casing (4), and a crushing method for producing a crushed product of different particle sizes at the same time is provided.

The classification of the pulverized material is performed by rapidly changing the flow direction of the carrier gas.

In the method of the present invention, since the crushing roller (3) is pressed against the rotating rotary table (2) to rotate, the raw material supplied to the central portion of the rotary table (2) is crushed. It can be crushed by being caught between the roller (3) and the rotary table (2).

The crushed product having a predetermined particle size is lifted by gas from an annular gap between the rotary table (2) of the roller mill (1) and the rigid casing (4), and crushed at an upper position in the casing (4). It is possible to classify products into two or more kinds and simultaneously produce and collect products having two or more kinds of particle sizes such as coarse particles and fine particles. At this time, the raw material that has not been sufficiently pulverized as a product is returned to the rotary table (2) and pulverized again.

The classification of the crushed material is performed by rapidly changing the gas conveying direction. For example, when producing a coarse-grained product, a sudden change in the direction of the air flow can cause separation due to the inertia of the large particles.

According to the structure of the present invention, the rotary table (2) for loading and rotating the raw material in the vertical casing (4).
A crushing roller (3) which is pressed against the upper surface of the rotary table (2) and is driven to rotate, and a crushed product crushed by the rotary table (2) and the crushing roller (3) to classify into a plurality of particle sizes. A plurality of substantially cylindrical separators (12) provided above the turntable (2),
A roller mill for use in a pulverizing method for producing pulverized products having different particle sizes at the same time.

In each of the separators (12), a blade (13) for dividing a crushed material into coarse particles and fine particles is provided around a horizontally arranged cylinder, and a discharge port (14) provided on one side in the longitudinal direction of the cylinder. ), And with.

In the roller mill (1) having the above structure, when the raw material supplied to the rotary table (2) receives centrifugal force in the radial direction of the table due to the rotation of the rotary table (2) and slides on the rotary table (2). On the turntable (2)
Receives a force in the direction of rotation, and slides with respect to the turntable (2) to perform a rotation somewhat slower than the rotation speed of the turntable (2). On the rotary table (2), the force in the radial direction and the force in the rotary direction are combined, and the raw material moves to the outer peripheral portion of the rotary table (2) in a spiral trajectory on the rotary table (2). At this outer peripheral portion, the crushing roller (3) is pressed and rotating, so that the raw material that draws the spiral is between the crushing roller (3) and the rotary table (2) at an angle with the roller axial direction. It is possible to crush the raw material that has entered from the direction of forming the bite.

The pulverized product pulverized in this way is lifted by gas from the annular passage (11) between the rotary table (2) of the roller mill (1) and the rigid cylindrical casing (4), and the casing ( In 4), a plurality of separators (12) at the upper position are used to classify the pulverized product having two or more particle sizes such as coarse particles and fine particles.

The separators (12) are preferably two cylinders staggered in the casing (4). A collecting device (18) for collecting the products classified by each separator (12) may be further provided. By alternately arranging the separators in this manner, the collecting device (18) can be arranged compactly, and the separators (12) can be conveyed to the collecting device (18) from the discharge port (14) and collected. . .

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. In each drawing, common parts are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 1 is a vertical sectional view of the roller mill of the present invention. FIG. 2 is a plan sectional view of the roller mill.

As shown in this figure, in the roller mill 1 of the present invention, a raw material charging chute 9 for charging a raw material is obliquely attached to the upper part of a cylindrical casing 4. The lower end opening 9a of the raw material charging chute 9 faces directly above the center of the rotary table 2. The rotary table 2 is driven by a speed reducer by a motor 5 at a lower portion to rotate at a low speed. The rotary table 2 is provided with a plurality of crushing rollers 3 which are pressed against the peripheral portion of the upper surface of the rotary table and equally rotated in a circumferential direction. A passage 11 for blowing gas is formed in a gap between the periphery of the rotary table 2 and the casing 4.

In the roller mill 1 thus constructed, the raw material is first supplied from the raw material charging chute 9 onto the rotary table 2. This raw material receives a centrifugal force in the radial direction of the table due to the rotation of the rotary table 2 and slides on the rotary table 2 by the rotary table 2 in the direction of rotation, and slides between itself and the rotary table 2. Rotate somewhat slower than the number of revolutions of. The radial and rotational forces are combined on the rotary table 2, and the raw material moves to the outer peripheral portion of the rotary table 2 in a spiral path on the rotary table 2. In this outer peripheral portion, the crushing roller 3 is pressed and rotating, so that the raw material in which the spiral is drawn enters between the crushing roller 3 and the rotary table 2 from a direction forming an angle with the roller axial direction. The bitten raw material can be crushed.

FIG. 3 is an enlarged perspective view in which one side of the separator of the present invention is cut.

The separator 12 of the present invention is provided with a blade 13 for separating coarse particles and fine particles and a discharge port 14 provided on one side in the longitudinal direction of the cylinder around the circumference of the cylinder. The plurality of blades 13 has a function of rapidly changing the air flow direction of the gas that conveys the pulverized material and classifying the gas into coarse particles and fine particles.

The separator 12 thus constructed is disposed laterally above the cylindrical casing 4 of the roller mill 1 as described above. In this way the separator 1
This is because by arranging 2 laterally, the plurality of separators 12 can be efficiently stored in the cylindrical casing 4 without degrading its classification function. The separator 12 is connected to a drive unit 17 such as a motor and rotated.

The separator 12 includes two separators 12.
By alternately arranging the products in the casing 4, the collection devices 18 for collecting the products classified by the separators 12 can be arranged alternately. Therefore,
These recovery devices 18 can also be arranged compactly. From the outlet 16 of each separator 12 to the recovery device 18
Transport to and collect. The crushed product is a roller mill 1.
Gas is lifted from an annular passage 11 between the rotary table 2 and the rigid cylindrical casing 4 by a gas, and is pulverized by a separator 12 at an upper position in the casing 4 to have two or more kinds of particle sizes such as coarse particles and fine particles. Be classified as a thing. In addition, in the above-described example, the two separators 12 arranged laterally on the vertical roller mill 1 have been described in detail, but the present invention is not limited to such an embodiment. For example, 3
It is needless to say that more than one separator 12 can be arranged and the arrangement direction can be inclined, and various changes can be made without departing from the scope of the present invention.

[0027]

As described above, according to the crushing method of the present invention for producing pulverized products having different particle sizes at the same time, the pulverized product is lifted by gas from the annular passage between the rotary table and the casing, and the pulverized product is roller-milled. It is possible to produce products of several kinds of particle sizes in a short time because it is possible to simultaneously produce and recover products of two or more kinds of particle sizes such as coarse particles and fine particles by performing classification of 2 or more kinds inside. Further, since the roller mill using the pulverizing method of the present invention for simultaneously producing pulverized products having different particle sizes has a plurality of separators provided in one roller mill, a plurality of classifiers are arranged around the roller mill. Since it is not necessary, it has an excellent effect that the equipment can be made compact.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a roller mill according to the present invention.

FIG. 2 is a plan sectional view of a roller mill.

FIG. 3 is an enlarged perspective view in which one side of the separator of the present invention is cut.

FIG. 4 is a partial front view showing a configuration of a rotary table and a crushing roller in a conventional roller mill.

FIG. 5 is a block diagram showing a conventional roller mill crushing method, in which (a) is an open circuit crushing method and (b) is a closed circuit crushing method.

[Explanation of symbols]

1 roller mill 2 turntable 3 crushing roller 4 casing 12 separators 13 feathers 14 outlet 17 Drive 18 Recovery device

Claims (6)

[Claims] 1. A raw material is supplied onto a rotary table (2) which rotates about a vertical axis in a vertical casing (4),
The raw material is pressed by a pulverizing roller (3) to be pulverized, and then the pulverized material is classified into products having two or more kinds of particle sizes at the upper position in the casing (4) at the same time. A pulverizing method for simultaneously producing pulverized products having different particle sizes. 2. The pulverization method for producing pulverized products having different particle sizes at the same time according to claim 1, wherein the pulverized product is classified by rapidly changing the flow direction of the carrier gas. 3. A rotary table (2) for loading and rotating a raw material in a vertical casing (4); a crushing roller (3) which is pressed against an upper surface of the rotary table (2) and is driven to rotate; A rotary table (2) and a plurality of substantially cylindrical separators (12) provided above the rotary table (2) in order to classify the crushed material crushed by the crushing roller (3) into different particle sizes. A roller mill for use in a crushing method for producing a crushed product having different particle sizes at the same time. 4. Each of the separators (12) has a large number of blades (13) for dividing coarse particles and fine particles around a horizontally arranged cylinder, and a discharge port (14) provided on one side in the longitudinal direction of the cylinder. ), And a roller mill used in a pulverizing method for producing pulverized products having different particle sizes at the same time according to claim 3. 5. The pulverization method for producing pulverized products having different particle sizes at the same time according to claim 3 or 4, wherein two separators (12) are arranged in a staggered manner in the casing (4). Roller mill. 6. The pulverized product having different particle sizes at the same time according to claim 3, 4 or 5, further comprising a recovery device (18) for recovering the products classified by the respective separators (12). A roller mill used in a pulverizing method for producing.