JP2858681B2 - Vertical crusher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical pulverizer used as a preliminary pulverizer for finely pulverizing chemicals such as cement clinker, blast furnace slag, ceramics and the like by cooperation of a rotary table and a pulverizing roller.

[0002]

2. Description of the Related Art As one type of a crusher for finely pulverizing raw materials such as limestone, slag, and cement raw material into powder, FIG.
As shown in FIG. 1, a vertical pulverizer 1 having a rotary table and a pulverizing roller is widely used. This kind of crusher is
The disk-shaped rotary table 3A, which is driven by the speed reducer 2 by the motor 2A at a lower portion of the cylindrical casing 15 and rotates at a low speed, is pressed by hydraulic pressure or the like to a portion equally dividing the outer peripheral portion of the upper surface in the circumferential direction, and is driven to rotate. And a plurality of crushing rollers 4.

The pulverizing roller 4 is connected to a piston rod 10 of a hydraulic cylinder 9 via an arm 5 and an arm 7 which are pivotally supported by a shaft 6 on a casing 15. The crushing roller 4 is pressed on the rotary table 3A to apply crushing pressure to the raw material. 3B is a dam ring for adjusting the raw material layer thickness provided on the outer peripheral edge of the rotary table 3A, the rotary table 3A around the annular space passage 14, 13 is rotated separator classifying the raw material is crushed by the blades 13 a, 16 a gas A gas outlet for taking out a product together therewith is a raw material input chute 17.

In such a vertical pulverizer, the raw material supplied to the center of the rotary table by the raw material charging chute 17 receives the centrifugal force in the table radial direction by the rotation of the rotary table 3A and slides on the rotary table 3A. When a force in the rotating direction is received by the rotating table 3A,
A slides with A and makes a rotation somewhat slower than the rotation speed of the turntable 3A. The above two forces, that is, the force in the radial direction and the force in the rotational direction are synthesized, and the raw material is
A moves to the outer periphery of the turntable 3A in a spiral locus on A. Since a roller is pressed against this outer peripheral portion and rotated, the raw material describing the spiral enters the crushing roller 4 and the rotary table 3A from a direction forming an angle with the roller axis direction and is caught. Rarely crushed.

On the other hand, a duct 1 is provided at the base of the casing 15.
4A guides gas such as air or hot air, and this gas blows up from an annular space passage 14 between the outer peripheral surface of the rotary table 3A and the inner peripheral surface of the casing 15, so that pulverized fine powder is obtained. Rises inside the casing 15 with the gas, and the separator 1
The product having a predetermined particle size is discharged from the discharge port 16 together with the gas, and is sent to the next step.

[0006]

When the conventional vertical pulverizer as described above is used as a pre-pulverizer for performing a finish pulverization with a ball mill or a rod mill in, for example, pulverization of a cement clinker, 30 to 50 mm is required. The raw material clinker is desirably supplied to a ball mill and a rod mill of a finishing pulverizer with a particle size of about 300 μm. However, if the conventional vertical mill is used as a pre-mill as it is, the particle size of the milled product will be widely distributed from small to almost as supplied, and the granules supplied to the finishing mill The width is too wide for the diameter distribution. This is from the fines after the crushed products are classified by the separator built into the mill, to the raw materials that were supplied on the rotating table but overflowed the rotating table without undergoing any crushing action with the crushing rollers, and were discharged. Because it includes. Therefore, as a feed raw material for the finish pulverization, the so-called one-pass pulverized particle diameter, which is supplied to a vertical pulverizer and subjected to pulverization performed between a rotary table and a pulverizing roller about once or twice, ie, one-pass pulverization, is almost one. Thus, a raw material having a narrow distribution, for example, sized to about 200 to 400 μm is desirable.

[0007]

Means for Solving the Problems (1) In order to solve the above problems, it is desirable to use a vertical pulverizer that does not incorporate a separator and does not perform pulverization many times. A plurality of rotatable crushing rollers are arranged on the upper surface of the crusher, and the raw material supplied from a material input chute provided by vertically suspending the axis of the vertical crusher from the center of the top of the crusher is supplied to the crushing roller in a predetermined manner. In a vertical pulverizer in which a pulverizing pressure is applied to pulverize between a top surface of a rotary table and a peripheral surface of a pulverizing roller, a curve along the outer periphery of the rotatable table is provided on the outer periphery of the rotatable table, and on the downstream side in the rotation direction of the pulverizing roller. A guide plate having a face plate suspended therefrom is protruded from the inner surface of the casing of the vertical pulverizer, and a discharge chute of the raw material dropped from the annular space formed by the rotary table and the casing is rotated by the rotary table. Provided at the lower part of the outer circumference ,
The raw material that has passed through and overflowed the rotary table
Rotate the rotary table against the curved plate
So that it can bite into the grinding roller located downstream in the rolling direction.
And pulverized, and the pulverized raw material is dropped into the annular space.
In this way, almost all of the milled raw material is removed from the annular space.
Through the discharge chute to the outside of the vertical mill.
It was configured to be put out . (2) In the vertical pulverizer of (1) above,
The plate has the same number as the grinding rollers.
Was.

[0008]

In vertical mills the the present invention, the separator is not, therefore, airflow for Easueputo is not necessary, after the raw material has been supplied onto the rotary table, which is ground on a grinder rollers, beyond the dam ring of the turntable Overflow and fall down the annular space passage. In this case , among the raw materials that pass through the rotary table between the crushing rollers and overflow and fall, the large-diameter material is bent between guide rollers provided between the crushing rollers and downstream of the crushing roller in the rotation direction.
It rebounds from the side curved plate as the face plate, is returned to the rotary table, and is bitten by the next crushing roller. However, fine particles and fine particles of several mm or less fall through the gap between the outer periphery of the rotary table and the side curved plate and the annular space passage without the guide plate, are collected by the discharge chute, and are discharged outside the machine. Therefore, the raw material supplied to the vertical pulverizer is almost one-pass pulverized, sized to several mm or less, and discharged. Number of the guide plates and the number of the crushing rollers
When the same number is installed, the curved plate of the guide plate
Of raw materials to the table
The action of biting the raw material into the crushing roller
Is performed reliably over the circumference, and the sizing of the raw materials is performed evenly.
Will be

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of a vertical pulverizer according to the present invention. FIG. 1 is an overall vertical sectional view of the vertical pulverizer, FIG. 2 is a plan view of a pulverizing unit, and FIG. It is.

In the figure, a top plate 15a of a casing 15 is shown.
A raw material charging chute 17 is hung down from the center of the rotary table 3A, and the lower end opening thereof is opposed to just above the center of the turntable 3A.
As shown in FIGS. 2 and 3, on the outer periphery of the turntable 3A,
Side curved plate 30 curved along the outer periphery of turntable 3A
A guide plate 30 having a is disposed downstream of the grinding roller 4 in the rotation direction, and is fixed to the casing 15. The gap between the side curved plate 30a of the guide plate 30 and the outer periphery of the turntable 3A is kept at a small value of about 5 to 10 mm. The side curved plate 30a can be made of hard synthetic resin in addition to steel. As shown in FIG. 3, a discharge chute 40 is provided below the outer periphery of the turntable 3A for collecting the raw material that has overflowed the turntable 3A and dropped into the annular space passage 14 and discharged the outside of the machine. ,
It is conveyed by a belt conveyor 50. 40a is a scraper attached to the turntable 3A.

The operation of the vertical pulverizer 1 of the present invention having the above-described structure will be described. The raw material supplied from the raw material charging chute 17 is spirally moved toward the outer peripheral side by the centrifugal force of the rotating rotary table 3A, and is pulverized by being caught between the grinding roller 4 and the rotary table 3A. Of the raw materials, the particles that have passed between the crushing rollers pass over the dam ring 3B and overflow the rotary table 3A, but just hit the side curved plate 30a of the guide plate 30 disposed at that position and return to the rotary table again. It is returned and bitten by the next crushing roller 4 downstream in the rotation direction to be crushed.

As described above, in the vertical pulverizer of the present invention, almost all of the raw material put into the rotary table is subjected to the pulverizing action of the pulverizing roller once or twice and then falls into the annular space passage. The raw material is supplied to the finishing mill in the form of particles in a state of being pulverized to several mm or less. Also, since there is no separator classifying effect by air sweep (air conveyance), the raw material is not pulverized more than necessary, the ratio of fine powder mixed into the discharged pulverized product is low, and the finished mill is relatively sized. It can supply raw materials with a narrow particle size range.

[0013]

As described above, the vertical pulverizer of the present invention finishes relatively sized granulated raw materials of several mm or less having a small amount of large large-diameter particles and a low fine powder content. Since it can be supplied to a mill, a desirable pre-mill can be provided.
In addition, since no air conveyance or separator is required, no intake fan or dust collector is required, and equipment and transportation costs can be kept low. In addition, since a relatively sized raw material of several mm or less can be supplied to the finishing mill, when a ball mill is used as the finishing mill, the maximum ball diameter in the first chamber can be reduced. , The productivity is increased, and the running cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an overall vertical sectional view showing an embodiment of a vertical crusher of the present invention.

FIG. 2 is a schematic plan view of a pulverizing unit showing an embodiment of the vertical pulverizer of the present invention.

FIG. 3 is a vertical sectional view of a main part of a pulverizing section showing an embodiment of the vertical pulverizer of the present invention.

FIG. 4 is an overall vertical sectional view of a conventional vertical crusher.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vertical grinder 3A Rotary table 4 Grinding roller 14 Annular space passage 17 Raw material input chute 30 Guide plate 30a Side curved plate 40 Discharge chute 40a Scraper

Claims (2)

(57) [Claims] 1. A plurality of rotatable crushing rollers are arranged on the upper surface of an outer peripheral portion of a rotary table, and the material is supplied from a material input chute provided from the center of the top of the crusher with the axis of the vertical crusher suspended vertically. In a vertical pulverizer for applying a predetermined pulverizing pressure to a pulverizing roller to pulverize the raw material between the upper surface of the rotary table and the peripheral surface of the pulverizing roller, at the outer periphery of the rotary table and at the downstream side in the rotation direction of the pulverizing roller. A guide plate having a curved plate extending along the outer periphery of the rotary table protrudes from the inner surface of the casing of the vertical crusher, and a discharge chute for the raw material that has fallen in the annular space formed by the rotary table and the casing is provided. provided on the rotary table outer periphery lower,該回pass through between the grinding rollers
The material overflowing the turntable is transferred to the curved surface of the guide plate.
Return to the rotary table by touching
Pulverize so as to bite into the pulverizing roller to be placed,
The crushed raw material is dropped into the annular space,
Almost all of the crushed material is discharged through the annular space.
A vertical crusher that is taken out of the vertical chute from the output chute . 2. The guide plate is provided with the grinding roller.
The vertical pulverizer according to claim 1, wherein the same number of pulverizers are provided.