JP2022006219A - Vertical mill - Google Patents

Abstract

To provide a vertical mill which prevents progress of nonuniform wear of roller tires in grinding rollers caused by uneven accumulation of a raw material on a rotary table due to supply imbalance.SOLUTION: In a vertical mill according to the present invention, freely rotatable grinding rollers are arranged on a rotary table. A raw material gets caught between the rotary table and the grinding rollers to be ground by compression and shearing force. In a space between a chute 25 which extends from a raw material supply port toward the rotary table, and the rotary table, a cone 22 is fixed by at least two supports 24 arranged at equal intervals from a width direction.SELECTED DRAWING: Figure 1

Description

It relates to a vertical crusher for crushing solid materials such as coal, limestone, cement raw material, clinker, slag, oil coke and other inorganic raw materials, and organic raw materials.

The crusher is a device that crushes and pulverizes coal, limestone, cement raw materials, etc., and the vertical crusher presses the crushing roller against a disk-shaped rotary table with hydraulic pressure or its own weight, and between the crushing roller and the rotary table. It is crushed by compression. This vertical crusher is widely used because it consumes less power per unit crushing amount and has the characteristics of being able to crush efficiently.

When the raw material is supplied from the chute into the vertical crusher, it falls to the center of the rotary table through the lower end tubular part of the inner cone, is pushed out to the outer circumference by centrifugal force, and is bitten between the crushing roller and the rotary table. It is crushed by compression and shearing force. In this crusher, a gap is provided between the rotating portion of the crushing roller and the lower casing on the outer periphery of the rotary table, and gas is ejected from the gap. The crushed raw material is carried in the direction of the gap between the outer peripheral portion of the rotary table and the casing, and is carried by the air flow of gas. In this way, it is sent to the classifier (separator) attached above, classified, and finally collected as a product to the outside. Further, those having a large size and insufficient crushing cannot pass through the classifier and are again supplied onto the rotary table and crushed.

In this way, while the crushed material is transported to the upper part of the machine using the gas airflow and taken out, the crushed material with a large particle size that cannot be transported by the gas airflow falls from the rotary table and falls from below the machine body. Will be recovered. After that, the recovered crushed material is again supplied onto the rotary table from above the machine body by a bucket elevator and repeatedly crushed to a desired particle size.

In order for the vertical crusher to fulfill its crushing function, it is important to keep the roller tires of the crushing rollers in a predetermined shape, but as the crushing time elapses, wear progresses and the shape changes. ..
Further, the raw materials supplied into the vertical crusher are unevenly deposited on the rotary table depending on the type of the raw material and the crushing conditions, and the layer thickness of the raw material layer becomes non-uniform. Therefore, the load applied to the roller tires of the plurality of crushing rollers fixed in the casing differs depending on the installation position of the crushing rollers, and the degree of wear progress of each crushing roller also varies.
When the roller tire is worn in this way, the raw material is not sufficiently pulverized, and the quality of the obtained pulverized product is deteriorated. In addition, the classifier consumes extra energy to crush the crushed material that is insufficiently crushed again. Even if crushing is performed again, it is difficult to obtain a desired crushed product with a worn roller tire.

Therefore, in general, in a vertical crusher, when the wear of the roller tire progresses, the roller tire of the crushing roller is removed and replaced with a new one, or the roller tire is replaced with a roller tire whose wear has not progressed so much.
However, after stopping the operation of the vertical crusher to cool the inside of the machine, the worker must work in a bad environment inside the casing where dust is generated. Furthermore, in a vertical crusher that does not have a device to detect the wear state of roller tires from outside the machine, a worker enters the casing, removes the set of roller shafts, inspects the condition of each part, and then replaces it. Must be determined.

Even when resuming operation after inspection or replacement work, it takes time and effort to install the roller tires because preparatory work such as adjusting the gap with the rotary table and heating the inside of the casing is required.
Further, since it takes a long time that the vertical crusher cannot be operated from the time when the operation is stopped until the operation is restarted, the roller tire replacement work is a problem because the operation rate is lowered.
In such a situation, unexpected maintenance work due to an operation trouble may cause the operation of the entire equipment including the vertical crusher to be stopped.

Japanese Unexamined Patent Publication No. 10-118510 Japanese Unexamined Patent Publication No. 2018-81012

In view of the above problems, when the crushing roller is replaced by periodic inspection etc., the gap between the crushing roller and the rotary table can be adjusted and set quickly and accurately, so the technology that can shorten the time to restart the operation is patented. It is disclosed in Document 1.
Further, Patent Document 2 discloses a technique for providing an abnormality detecting device capable of detecting an initial abnormality of a crushing roller, particularly a bearing, with high accuracy without stopping the operation.
With these conventional techniques, the time until the operation is restarted and the inspection avoiding the stoppage of the operation are performed to stabilize the operation.

The problem to be solved by the present invention is that the raw material is unevenly deposited on the rotary table due to the imbalance in the supply balance of the raw material, and the wear of the roller tire of the crushing roller progresses unevenly (only a certain roller tire is worn). It is intended to provide a vertical crusher that prevents (such as a large degree of progress).

As a first means to solve the above problems,
Arrange a rotatable crushing roller on the rotary table,
In a vertical crusher that crushes raw materials by compression and shearing force by being bitten between the rotary table and the crushing roller.
It is an object of the present invention to provide a vertical crusher in which a cone is arranged between a chute extending from a raw material supply port toward the rotary table and the rotary table.
According to the first means, the raw material to be charged flows radially by the conical body, and the raw material can be uniformly supplied onto the rotary table, so that uneven wear on the roller tire can be prevented.

As a second means to solve the above problems,
The vertical grinding according to the first means, wherein in the space between the chute extending toward the turntable and the turntable, the cone is fixed by at least two supports arranged at equal intervals from the width direction. It is to provide an opportunity.
According to the second means, the flow of the raw material input by the conical body can be controlled to uniformly supply the raw material onto the rotary table, so that uneven wear occurring in the roller tire can be prevented. can.

As a third means to solve the above problems,
The cone is a right cone or an oblique cone,
It is arranged in the lower end tubular portion formed at the lower end of the funnel-shaped inner cone provided below the chute.
It is an object of the present invention to provide the vertical crusher according to the first or second means, wherein the position of the cone can be freely adjusted in a range where the apex of the cone is orthogonal to the circle on the bottom surface.
According to the third means, the flow of the charged raw material is controlled by adjusting the inclination angle of the side surface of the cone according to the angle formed by the apex of the cone with the center of the circle on the bottom surface, and the surface is placed on the rotary table. Since the raw material can be supplied uniformly, it is possible to prevent uneven wear of the roller tire.

As a fourth means to solve the above problems,
The cone is an oblique cone,
Arranged inside a funnel-shaped inner cone provided below the chute so as to be located directly below the chute.
It is an object of the cone to provide the vertical crusher according to the first or second means, which is capable of adjusting the rotation clockwise or counterclockwise.
According to the fourth means, by changing the inclination angle of the side surface of the oblique cone and further adjusting the rotation, the flow of the input raw material can be controlled and the raw material can be uniformly supplied onto the rotary table. It is possible to prevent uneven wear of the roller tire.

As a fifth means to solve the above problems,
The internal cone has a structure that can be divided into upper and lower parts.
A cone is fixed to the uppermost portion of the lower division portion, and the lower division portion is rotated clockwise or counterclockwise.
It is an object of the present invention to provide the vertical crusher according to the fourth means for rotating and adjusting the cone.
According to the fifth means, by changing the inclination angle of the side surface of the oblique cone and further adjusting the rotation, the flow of the input raw material can be controlled and the raw material can be uniformly supplied onto the rotary table. It is possible to prevent uneven wear of the roller tire.

According to the present invention, the conical body uniformly disperses and deposits the raw materials charged into the vertical crusher on the rotary table without bias, so that the degree of wear progress of each roller tire of the crushing roller is uniform. can do. As a result, not only the frequency of replacement of the roller tires can be reduced, but also the progress of abnormal wear of the roller tires can be prevented and sudden maintenance work can be avoided, so that the operation can be stabilized.

It is sectional drawing of the conical body arranged in the lower end tubular part of this invention. It is explanatory drawing of the cone arranged in the lower end tubular part of this invention, (a) shows the embodiment before adjustment, (b) shows the embodiment after adjustment. It is sectional drawing of the cone arranged in the inner cone of this invention. It is explanatory drawing of the cone arranged in the inner cone of this invention, (a) shows the embodiment before adjustment, (b) shows the embodiment after adjustment. It is sectional drawing of the cone arranged in the inner cone which can be divided into upper and lower parts of this invention. It is explanatory drawing of the cone arranged in the inner cone which can be divided into upper and lower parts of this invention, (a) shows the embodiment before adjustment, and (b) shows the embodiment after adjustment. It is sectional drawing of the conventional vertical crusher.

It will be described in detail below with reference to the attached drawings.

[Conventional vertical crusher]
FIG. 7 is a cross-sectional view of a conventional vertical crusher. As shown in the figure, the vertical crusher 1 includes a rotary table 6 and a crushing roller 4A driven by a speed reducer and a drive motor (not shown) installed below the upper casing 2A and the lower casing 2B forming the outer shell. It is equipped with. Further, an internal cone 3A having a funnel shape is arranged above the rotary table 6, and a classification mechanism 8 is fixed to the upper part of the internal cone 3A. A cylindrical raw material supply port 10 is arranged coaxially with the center of the classification mechanism 8 and the center of the lower opening of the internal cone 3A, and the raw material input from the raw material supply port 10 is passed through the chute 5 to the rotary table 6. Accumulate on top. The deposited raw material is bitten between the roller tire 4B of the crushing roller 4A and the rotary table 6 and crushed by compression and shearing force.
Further, the vertical crusher 1 has a gas introduction port 7 for introducing gas below the rotary table 6 and an discharge chute for taking out a large crushed material having insufficient crushing that cannot be conveyed by the gas air flow. 11 and an upper outlet 12 for taking out a pulverized product (product) having a desired particle size together with gas are provided above the classification mechanism 8.

[Place a cone in the lower end tubular part]
In the vertical crusher of the present invention, as shown in FIG. 1, the cone 22 is arranged near the discharge port of the lower end tubular portion 23B of the inner cone 23A. The adjustment of this arrangement is performed by the supports 24 arranged at equal intervals from at least two directions supported in the lower end tubular portion 23B.
FIG. 2 shows a cone 22 supported by supports 24 arranged at equal intervals from four directions in the lower end tubular portion 23B. In this structure, the cone 22 can be rotated clockwise or counterclockwise to adjust the cone 22 so that the four supports 24 supporting the cone 22 are directed toward the inner wall surface of the lower end tubular portion 23B. By pushing and pulling, the cone 22 is moved and adjusted in the x-axis direction or the y-axis direction on the same plane as the bottom surface.
At this time, the cone 22 provided in the lower end tubular portion 23B is an oblique cone or a right cone, and the diameter size of the bottom surface and the inclination angle of the side surface of the cone 22 are the raw materials to be charged into the vertical crusher. Adjust according to the tendency of the flow. Further, the diameter size of the circle on the bottom surface of the conical body 22 is preferably two-fifths or less of the inner diameter size of the lower end annular portion 23B. A structure in which a ball screw or a nut and a screw are combined is adopted for the support body 24, and a movable joint that can be flexibly supported is used for the connection portion between the conical body 22 and the support body 24.

Such position adjustment of the cone 22 is determined from the tendency of the raw material flow confirmed in advance. The conical body 22 is freely moved in the x-axis direction or the y-axis direction on the opposite planes of the rotary table to adjust the width of the gap between the lower end tubular portion 23B and the conical body 22, and the raw materials are unevenly distributed on the rotary table. Then, a large amount of raw material is supplied to the part where the amount tends to be small (conversely, the supply of the raw material is suppressed to the part where the amount tends to be large).

FIG. 2 shows an oblique cone in which the apex 21 of the cone is not orthogonal to the center of the circle on the bottom surface of the cone 22, and when the embodiment of FIG. 2 (a) is before adjustment, FIG. 2 (b) is shown. In the embodiment of (a), after rotating the cone 22 clockwise by 20 ° with the center of the circle on the bottom surface of the cone 22 as a reference point, the lower end tube is formed on the same plane as the bottom surface of the cone 22. When the inner diameter of the portion 23B is 1 m, it is the result of adjusting by moving -3 cm in the x-axis direction and +10 cm in the y-axis direction.
In FIG. 2, (a) is an embodiment before adjustment, but as a result of adjustment, it can also be an embodiment of (a).
In this way, the conical body 22 having the optimum inclination angle provided in the lower end tubular portion 23B is rotated by the raw material flow confirmed in advance, and is moved on the same plane as the conical body 22 in the x-axis direction or the y-axis direction. By adjusting, the uneven distribution of raw materials accumulated on the rotary table can be prevented and the degree of progress of wear of the roller tires can be made uniform. Can be lowered. In addition, it is possible to prevent the progress of abnormal wear of the roller tires and avoid sudden maintenance work, so that the operation can be stabilized.

[Place a cone inside the inner cone]
As shown in FIGS. 3 and 5, the cones 32 and 42 are supported by the supports 34 and 44 at equal intervals from at least two directions at the intermediate points of the slope lengths in the inner cones 33A and 43A, and the raw materials to be charged are Control the flow of the charged raw material so that it does not accumulate unevenly on the rotary table.
At this time, the cones 32 and 42 provided in the inner cones 33A and 43A are oblique cones, and are adjusted to the optimum inclination angle according to the tendency of the raw material flow confirmed in advance. Further, the vertices of the cones 32 and 42 must be positioned orthogonal to the bottom surface, and can freely move within a circle of the same size coaxial with the circle on the bottom surface in a plane orthogonal to the bottom surface. It can be adjusted to various tilt angles. At this time, the diameter of the circle on the bottom surface of the cones 32 and 42 is the same as the size of the opening diameter of the chutes 35 and 45 in which the raw material is supplied to the rotary table.

As shown in FIG. 3, a cone 32 is provided directly below the chute 35 extending from the raw material supply port toward the rotary table, and the cone 32 is hung in a cross shape from four directions in the space inside the inner cone 33A. It is fixed on the support 34.

FIG. 4 is a diagram illustrating a cone 32 fixed inside the inner cone 33A. The fixing hole 36 on the bottom surface of the conical body 32 and the support 34 are bolted from below and fixed to the support 34. Therefore, fixing holes 36 are provided at equal intervals on the bottom surface of the conical body 32 for fixing bolts, and the number of fixing holes 36 can be changed depending on the size of the crusher and the crushing conditions.
The cone 32 is an oblique cone, the apex 31 of the cone is not orthogonal to the center of the circle on the bottom surface of the cone 32, and the inclination angle of the cone 32 can be adjusted by the flow of the raw material confirmed in advance. ..
By adjusting the rotation of the cone 32, the position of the apex 31 of the cone 31 is adjusted to control the flow of the raw material.
Assuming that the embodiment of FIG. 4A is before adjustment, the embodiment of FIG. 4B rotates the cone 32 clockwise by 120 ° with respect to the center of the circle on the bottom surface from the embodiment of (a). This is the result of adjustment.
In FIG. 4, (a) is an embodiment before adjustment, but as a result of adjustment, it can also be an embodiment of (a).
In this way, by adjusting the rotation of the cone 32 having the optimum inclination angle provided in the internal cone 33A by the raw material flow confirmed in advance, uneven distribution of the raw material deposited on the rotary table is prevented, and the roller tire is worn. Since the degree of progress can be made uniform, it is possible to reduce the frequency of maintenance of crushing rollers and replacement of roller tires, which are time-consuming and labor-intensive tasks. In addition, it is possible to prevent the progress of abnormal wear of the roller tires and avoid sudden maintenance work, so that the operation can be stabilized.

Further, as shown in FIG. 5, a cone 42 is provided directly below the chute 45 extending from the raw material supply port toward the rotary table, and the cone 42 can be divided into upper and lower parts from the lower structure of the inner cone 43A to the inner cone. It is fixed to the space in 43A on a support 44 extending in a cross shape from four directions.
The lower structure of the inner cone 43A, which is integrated with the support 44 on which the cone 42 is fixed, has an annular fixture that surrounds the outer circumference of the inner cone 43A, and the fixture is provided at equal intervals. There are a plurality of fixing holes, and they are fixed by tightening with bolts 47.

FIG. 5 is a diagram illustrating a cone 42 fixed inside the inner cone 43A. The cone 42 is an oblique cone, the apex 41 of the cone is not orthogonal to the center of the circle on the bottom surface of the cone 42, and the inclination angle of the cone 42 can be adjusted by the flow of the raw material confirmed in advance. ..
By adjusting the rotation of the cone 42, the position of the apex 41 of the cone 41 is adjusted to control the flow of the raw material. At this time, since the conical body 42 is rotated and fixed in accordance with the fixing holes 46 in the fixture, the number of the fixing holes 46 can be changed depending on the size of the crusher and the crushing conditions.
Assuming that the embodiment of FIG. 6 (a) is before adjustment, the embodiment of FIG. 6 (b) rotates the cone 32 clockwise with the center of the circle on the bottom surface of the cone 32 as a reference point from the embodiment of (a). This is the result of adjusting the rotation by 30 °.
In FIG. 6, (a) is an embodiment before adjustment, but as a result of adjustment, it can also be an embodiment of (a).
In this way, by adjusting the rotation of the cone 42 having the optimum inclination angle provided in the internal cone 43A by the raw material flow confirmed in advance, uneven distribution of the raw material deposited on the rotary table is prevented, and the roller tire is worn. Since the degree of progress can be made uniform, it is possible to reduce the frequency of maintenance of crushing rollers and replacement of roller tires, which are time-consuming and labor-intensive tasks. In addition, it is possible to prevent the progress of abnormal wear of the roller tires and avoid sudden maintenance work, so that the operation can be stabilized.

Further, the problem that the raw material put into the vertical crusher is repeatedly crushed to reduce the biting force into the crushing roller and cause a stick-slip phenomenon to cause abnormal vibration is also solved by the present invention on the rotary table. Since the raw material is uniformly deposited on the surface, it is expected to be surely bitten into the crushing roller to prevent it.

In addition to the above, as long as the gist of the present invention is not deviated, the configurations listed in the above embodiments can be selected or appropriately changed to other configurations.

1 Vertical crusher 2A Upper casing 2B Lower casing 3A, 23A, 33A, 43A Inner cone 3B, 23B, 33B, 43B Lower end tubular part 4A Crushing roller 4B Roller tire 5, 25, 35, 45 Chute 6 Rotating table 7 Gas introduction Port 8 Classification mechanism 10 Raw material supply port 11 Discharge chute 12 Upper outlet 21, 31, 41 Conical apex 22, 32, 42 Conical body 24, 34, 44 Support 36, 46 Fixing hole 47 Bolt

Claims (5)

Arrange a rotatable crushing roller on the rotary table,
In a vertical crusher that crushes raw materials by compression and shearing force by being bitten between the rotary table and the crushing roller.
A vertical crusher in which a cone is arranged between a chute extending from a raw material supply port toward the rotary table and the rotary table.
The vertical crusher according to claim 1, wherein in the space between the chute extending toward the rotary table and the rotary table, the cone is fixed by at least two supports arranged at equal intervals from the width direction. ..
The cone is a right cone or an oblique cone,
It is arranged in the lower end tubular portion formed at the lower end of the funnel-shaped inner cone provided below the chute.
The vertical crusher according to claim 1 or 2, wherein the position of the cone can be freely adjusted within a range where the apex of the cone is orthogonal to the circle on the bottom surface.
The cone is an oblique cone,
Arranged inside a funnel-shaped inner cone provided below the chute so as to be located directly below the chute.
The vertical crusher according to claim 1 or 2, wherein the cone can be rotated clockwise or counterclockwise.
The internal cone has a structure that can be divided into upper and lower parts.
A cone is fixed to the uppermost portion of the lower division portion, and the lower division portion is rotated clockwise or counterclockwise.
The vertical crusher according to claim 4, wherein the cone is rotated and adjusted.

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