JP2017000974A - Vertical mill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vertical mill capable of improving the crushing efficiency of a crushing roller and preventing the occurrence of abnormal vibration during crushing.SOLUTION: In a vertical mill crushing a crushing raw material by rotatably rolling a crushing roller 16 on the upper surface 14A of a rotation table via the crushing raw material, a compression plate 50 is disposed along the radial direction of the upper surface 14A of the rotation table at the biting side of the crushing raw material of the crushing roller 16 on the upper surface 14A of the rotation table. The compression plate 50 is disposed in a longitudinal direction along the radial direction, the width direction of the compression plate is formed to be arcuate and the crushing raw material on the upper surface 14A of the rotation table can be compressed by the arcuate external surface.SELECTED DRAWING: Figure 1

Description

  The present invention mainly uses coal, oil coke, limestone, slag, clinker, cement raw material, other inorganic raw materials, or organic raw materials such as chemicals and biomass on a rotary table and a powder having a predetermined particle size. The present invention relates to a vertical crusher that pulverizes the body.

  A vertical crusher is widely used as a crusher for crushing raw materials such as coal and biomass. A conventional vertical crusher includes a rotary table and a plurality of crushing rollers arranged in a position that equally divides the outer peripheral portion of the upper surface of the rotary table in the circumferential direction in a casing that forms an outer shell of the crusher. .

  In such a vertical crusher, when the pulverized raw material is supplied to the center of the rotary table, the pulverized raw material moves to the outer peripheral portion of the rotary table by the rotation of the rotary table. Since the crushing roller is pressed against the outer peripheral portion and rotated, the crushing raw material enters between the crushing roller and the rotary table and is crushed. And by the hot air blowing from the annular passage between the outer peripheral surface of the rotary table and the inner peripheral surface of the casing, the inside of the casing rises while the granular material is dried together with the hot air. The powder particles are sorted by the classifying means provided in the upper part of the casing, and the product of a predetermined particle size is discharged to the outside. Coarse powder that cannot pass through the classification means falls again on the rotary table and is pulverized.

  Depending on the particle size, the pulverized raw material cannot be pulverized into a pulverized product having a desired particle size in one pulverization, and usually, a plurality of times are used to obtain a pulverized product having a desired particle size. A grinding process is required. In the above-mentioned casing, the pulverized product is circulated in the casing by being moved up by hot air and falling until it reaches the classification means, or by being removed by the classification means and returning to the rotary table. Grinding by the grinding roller is performed several times. The pulverized material circulating in the pulverizer is about 5 to 7 times the amount supplied to the pulverizer, and is circulated by hot air from the lower part of the casing. It will be. Therefore, it is required to quickly pulverize to a desired particle size in the pulverizer and discharge it to the outside of the pulverizer to reduce the amount of internal circulation.

  Conventionally, in order to improve the crushing efficiency of the vertical crusher, the vertical crusher of Patent Document 1 has a crushing roller, an auxiliary roller, and a scraper attached to the upper surface of the crushing table. The auxiliary roller degass and pre-compresses the pulverized raw material or pulverized product, and prevents the occurrence of vibration when pulverizing by the pulverizing roller, and makes it easy to bite with the pulverizing roller. The scraper makes the thickness of the layer of the pulverized raw material or pulverized product uniform.

Japanese Patent Laid-Open No. 3-217250

  However, in a vertical crusher equipped with auxiliary rollers, when the top surface of the rotary table is viewed in plan, the table is covered with a plurality of grinding rollers and auxiliary rollers, and the pulverized material circulating in the casing falls onto the top surface of the rotary table. The place to do is limited. For this reason, the pulverized material falling on the upper surface of the rotary table is uneven because the thickness of the deposited layer differs between the location where the roller is present and the location where the roller is not present. A portion where the layer of pulverized material on the upper surface of the rotary table is thick falls from the outer diameter side due to the centrifugal force caused by the rotation. Further, the thick layer portion is pushed out of the table without being pre-compressed by the auxiliary roller. Further, the unevenness of the pulverized material on the upper surface of the rotary table has a difference in height, which causes vibrations due to the difference in density when the pulverizing roller is compressed.

  Further, like the crushing roller, the auxiliary roller is fixed to the arm so as to be swingable from the side wall of the casing toward the center of the rotary table. The auxiliary roller moves up and down in an arc shape by the expansion and contraction of the hydraulic cylinder connected to the arm and comes into contact with the upper surface of the rotary table. In such an auxiliary roller, when the roller is lifted by a change in the layer thickness of the pulverized material, the distance between the upper surface of the table and the roller surface is different between the center side and the outer peripheral side of the rotary table, so that the layer thickness can be made uniform. Absent. Note that the scraper has the same configuration, and the layer thickness cannot be made uniform.

  In the vertical grinder, the pulverized product circulated in the casing is 5 to 7 times the pulverized raw material, and the pulverized product circulated into the pulverized product of the desired particle size in a small number of times. Processing capacity is determined by whether it is discharged. The pulverized raw material and the pulverized material to be processed by the vertical pulverizer have no variation in the layer thickness of the pulverizing surface of the pulverizing roller, and the layer thickness of the pulverized raw material and pulverized product and the air contained in the pulverized surface are removed under conditions optimal for pulverization. It is required to be concerned.

  In view of the above-described problems of the prior art, an object of the present invention is to provide a vertical crusher capable of improving the crushing efficiency of a crushing roller and preventing occurrence of abnormal vibration during crushing.

As a first means for solving the above-mentioned problems, the present invention provides a vertical crusher that pulverizes the pulverized raw material by rotating a pulverizing roller rotatably on the upper surface of the rotary table via the pulverized raw material. A compression plate is provided along the radial direction of the upper surface of the rotary table on the biting side of the grinding raw material of the grinding roller on the upper surface of the rotary table. The present invention is to provide a vertical crusher characterized in that the crushed material on the upper surface of the rotary table can be compressed by the arc-shaped outer surface.
With such a configuration, the compression plate is provided on the crushing material biting side of the crushing roller on the upper surface of the rotary table, so that the crushing material and crushing material on the biting side of the crushing roller can be compressed to an optimum layer thickness. it can. Moreover, since the width direction of the compression plate is formed in an arc shape, it is possible to secure an area where the pulverized raw material and the pulverized material that fall on the upper surface of the rotary table are accumulated. Therefore, the pulverized raw material and the pulverized material deposited on the rotary table can be efficiently pulverized. Moreover, abnormal vibration does not occur during pulverization.

According to the present invention, as a second means for solving the above-described problem, in the first means, the compression plate is attached to a shaft arranged in an axial direction along a radial direction of the rotary table, and the shaft of the shaft It is an object of the present invention to provide a vertical crusher characterized in that it can rotate along its circumference.
By adopting such a configuration, the compression plate is attached to the shaft arranged in the axial direction in the radial direction of the upper surface of the turntable, and arranged parallel to the upper surface of the turntable. The optimum layer thickness of the uniform pulverized raw material can be formed at equal intervals with respect to the side. Therefore, improvement of pulverization efficiency and abnormal vibration during pulverization can be prevented.

The present invention provides a third means for solving the above-mentioned problems. In the first or second means, the upper end of the compression plate is attached to the shaft so as to be at the height of the compression range of the pulverized raw material. An object is to provide a vertical crusher characterized by being attached.
By adopting such a configuration, the upper end of the compression plate is set to the height of the compression range of the pulverized raw material, so when the layer thickness of the excessive pulverized raw material exceeds the compression range of this pulverized raw material. Is a sudden load fluctuation that acts on the compression plate even when the layer thickness suddenly changes due to excess crushed raw material and crushed material getting over the upper end of the compression plate and flowing downstream or to the outer periphery of the upper surface of the rotary table. The pulverized raw material can be compressed to an optimum density. Therefore, improvement of pulverization efficiency and abnormal vibration during pulverization can be prevented.

  According to the present invention as described above, the pulverized raw material and the pulverized product on the biting side of the pulverizing roller can be compressed to an optimum layer thickness, and the pulverizing efficiency of the pulverizing roller can be improved. Further, since the width direction of the compression plate is formed in an arc shape, it is possible to secure an area in which the pulverized raw material and the pulverized material that fall on the upper surface of the rotary table are accumulated. Therefore, the pulverized raw material and the pulverized material deposited on the rotary table can be efficiently pulverized. Moreover, abnormal vibration does not occur during pulverization.

  Further, in the conventional pulverizer, when the auxiliary roller is lifted from the rotary table by the pulverized raw material, the distance between the upper surface of the rotary table on the inner diameter side and the outer diameter side of the auxiliary roller is different. Although the uniform layer thickness of the pulverized raw material could not be formed on the side, the compression plate of the present invention is attached to the shaft arranged in the axial direction in the radial direction of the upper surface of the rotary table, so the center of the upper surface of the rotary table The optimum layer thickness of the pulverized raw material can be formed at equal intervals with respect to the side or the outer peripheral side. Therefore, improvement of pulverization efficiency and abnormal vibration during pulverization can be prevented.

  Furthermore, there is no variation in the thickness of the pulverized layer on the rotary table, and abnormal vibration during pulverization due to non-uniform layer thickness of the pulverized surface of the pulverizing roller is eliminated.

It is a perspective view of the compression board of this embodiment. It is a top view of the compression board of this embodiment, a crushing roller, and a rotary table. It is a front view of the compression board of this embodiment. It is a block schematic diagram of a vertical crusher.

  Embodiments of a vertical crusher of the present invention will be described below in detail with reference to the accompanying drawings.

[Vertical crusher 10]
FIG. 4 is a schematic configuration diagram of a vertical crusher. As shown in the figure, the vertical crusher 10 includes a casing 12, a rotary table 14, a plurality of crushing rollers 16 arranged at positions where the outer peripheral portion of the upper surface of the rotary table 14 is equally divided in the circumferential direction, The main basic structure includes an annular passage 40 formed along the outer periphery of the table 14, classification means 30 provided on the upper portion of the casing 12, a dam ring 48 mounted on the outer peripheral edge of the rotary table 14, and a compression plate 50. It is said.

  The crushing roller 16 is connected to the piston rod of the hydraulic cylinder 24 via an upper arm 20 pivotally attached to the lower casing 12B serving as a fulcrum and a lower arm 22 formed integrally with the upper arm 20. . The crushing roller 16 is laterally pressed on the upper surface 14A of the rotary table by the operation of the hydraulic cylinder 24, and rotates by being driven by the rotary table 14 via the crushing raw material.

A classification means 30 is provided above the upper surface 14 </ b> A of the casing 12.
The classifying means 30 includes a rotary shaft 30a, a rotary blade 30b, and a fixed blade 30c. The rotating shaft 30a hangs downward from the upper surface of the casing 12, and is configured to be rotatable by an external drive motor (not shown). A plurality of rotary blades 30b are arranged in a ring shape below the rotary shaft 30a, with the rotary shaft 30a as an axis. Further, a plurality of fixed blades 30c are formed side by side on the outer periphery of the rotary blade 30b. Both the rotary blade 30b and the fixed blade 30c are arranged in parallel with the axis of the rotary shaft 30a in the longitudinal direction, and the hot air rising in the casing 12 is a gap between the blades parallel to the axis of the rotary shaft 30a. Supplied from In the classifying means 30 having such a configuration, the rotary blade 30 b rotates together with the rotary shaft 30 a, and only fine powder particles (fine powder) that have passed through the fixed blade 30 c and the rotary blade 30 b are discharged from the upper outlet 44.

  An inner cone 30e and a feed pipe 30f are provided at the lower end of the fixed blade 30c. The inner cone 30e is formed in a funnel shape whose diameter decreases from the upper side to the lower side, and the feed tube 30f is formed in a cylindrical shape connected to the lower end of the inner cone 30e. The body is captured and supplied to the rotary table upper surface 14A from the lower discharge port via the feed tube 30f.

A raw material charging chute 34 is connected to the inner cone 30e. The raw material is charged from the raw material charging port 32 to the rotary table upper surface 14A via the raw material charging chute 34.
The raw material charged from the raw material charging chute 34 moves to the outer periphery of the rotary table upper surface 14A while drawing a spiral trajectory on the rotary table upper surface 14A, and is caught between the rotary table upper surface 14A and the grinding roller 16 and pulverized. The A part of the pulverized granular material passes over the dam ring 48 that is provided around the outer edge of the turntable upper surface 14A to adjust the layer thickness of the raw material, and the outer periphery of the turntable upper surface 14A and the casing 12 It goes to the annular passage 40 which is a gap. Here, a gas introduction port 42 for introducing hot air heated to a predetermined temperature is provided below the turntable 14 of the lower casing 12B.

During operation of the vertical crusher 10, by introducing hot air from the gas inlet 42, the hot air flowing through the classification means 30 from below the rotary table 14 to the upper outlet 44 in the casing 12. Airflow is generated.
The raw material charged into the vertical crusher 10 and part of the powder that has been crushed by the rotary table 14 and the crushing roller 16 and overcame the dam ring 48 described later are blown up by hot air from the annular passage 40. The inside of the casing 12 is raised and reaches the classifying means 30.

Here, the granular material having a large diameter and mass cannot pass through the fixed blade 30c and the rotating blade 30b of the classifying means 30, falls to the internal cone 30e, is re-engaged by the grinding roller 16, and is crushed. The On the other hand, the granular material having a small diameter passes through the classifying means 30 through the fixed blades 30c and the rotary blades 30b arranged with a gap therebetween, and is taken out of the casing 12 through the upper outlet 44.
Further, a part of the raw material having a maximum particle size that does not get caught in the crushing roller 16 and reaches the annular passage 40 as it falls falls below the rotary table 14 from the annular passage 40 and is vertically crushed from the lower outlet 46. It is taken out of the machine 10.

[Compression plate 50]
FIG. 1 is a perspective view of a compression plate according to this embodiment. FIG. 2 is a plan view of the compression plate, crushing roller, and rotary table of this embodiment. FIG. 3 is a front view of the compression plate of the present embodiment.
The compression plate 50 is attached to the biting side of the crushing roller 16 on the upper surface 14 </ b> A of the rotary table, using a steel plate having a predetermined rigidity similar to that of the casing 12. The compression plate 50 is formed by arranging the longitudinal direction along the radial direction of the turntable 14 and curving the width direction in an arc shape. When the outer peripheral angle of the conventional auxiliary roller is 360 degrees, the compression plate 50 is curved in the width direction into an arc of 90 degrees to 180 degrees (an arc when the sector angle is 90 degrees) which becomes a compression surface for deaeration. I am letting.

  The upper end side of the compression plate 50 is fixed to one end of the shaft 60. The shaft 60 is inserted from the opening on the side of the casing 12 in a state of being kept horizontal from the outside toward the inner center, and the axial direction is arranged along the radial direction of the turntable 14. The shaft 60 is rotatably supported via a bearing 64 by a bearing 62 disposed outside the casing 12. A lever 66 is attached to the other end of the shaft 60 protruding from the opposite side of the bearing 62 (opposite to one end side of the shaft 60). The lever 66 extends in a direction orthogonal to the axial direction of the shaft 60.

  A drive unit 70 is connected to the lever 66. The drive unit 70 rotates the shaft 60 about its axis, and a hydraulic or pneumatic cylinder mechanism or an elastic body such as a spring can be used. The drive unit 70 of this embodiment uses a hydraulic cylinder as an example, and a cylinder disposed outside the casing 12 and the tip of the piston rod are pin-coupled to the lever 66. With the drive unit 70 having such a configuration, the shaft 60 can be rotated around the axis at a predetermined angle by advancing and retracting the cylinder. The compression plate 50 configured as described above can rotate around the axis of the shaft 60 and can compress the pulverized raw material and the pulverized material at a higher compressibility as the arc-shaped outer surface is closer to the upper surface 14A of the rotary table. By rotating the shaft 60, the inclination of the compression plate 50 with respect to the upper surface 14A of the rotary table can be changed, and the pulverized raw material and the pulverized product can be deaerated and set to an optimum layer thickness.

  Further, the upper end of the compression plate 50 is attached to the shaft 60 so as to have a height in the compression range of the pulverized raw material. The height of the compression range of the pulverized raw material in the present embodiment refers to a height at which the pulverizing roller 16 can perform optimal pulverization on the upper surface 14A of the rotary table. The compression plate 50 is an arc when the sector angle is 90 degrees as described above, and the height from the upper surface 14A of the rotary table is set lower than that of the conventional auxiliary roller. For this reason, by setting the upper end of the compression plate 50 to the height of the compression range of the pulverized raw material, the pulverized raw material higher than this height gets over the upper end of the compression plate 50 to the downstream side or the outer peripheral side of the rotary table 14. Flowing. As a result, the excess pulverized raw material is not degassed and the pulverized raw material does not become thick.

[Action]
The operation of the vertical crusher of the present invention having the above configuration will be described below.
When the rotary table 14 of the vertical crusher 10 is rotated, the crushing roller 16 laterally pressed by the hydraulic cylinder 24 onto the upper surface 14A of the rotary table is also rotated. Then, when the pulverized raw material is supplied from the raw material input port 32, it falls onto the rotary table upper surface 14A and moves to the outer periphery of the table while drawing a spiral trajectory on the rotary table upper surface 14A.
By the compression plate 50 arranged on the biting side of the pulverizing roller 16, the pulverized raw material containing a large amount of air is compressed by the arc-shaped outer surface and deaerated to obtain an optimum layer thickness for pulverization. Then, it is caught between the upper surface 14A of the rotary table and the crushing roller 16 and crushed.

The hot air blown from the annular passage 40 between the outer peripheral surface of the turntable 14 and the inner peripheral surface of the casing 12 raises the inside of the casing 12 while the granular material is dried together with the hot air. The granular material is distributed by the classifying means 30 provided in the upper part in the casing 12, and the product of a predetermined particle size is discharged | emitted outside. On the other hand, the coarse powder that cannot pass through the classification means 30 falls again onto the rotary table upper surface 14A through the internal cone 30e and is pulverized.
When the pulverized material falls on the rotary table upper surface 14A, the crushed material is compressed again by the arc-shaped outer surface by the compression plate 50, so that the layer thickness becomes optimum for pulverization. Further, when the pulverized raw material and the pulverized material are higher than the height of the compressed range of the pulverized raw material, the crushed raw material flows over the upper end of the compression plate 50 to the downstream side or the outer peripheral side of the turntable 14. As a result, the excessive pulverized raw material and pulverized material are not compressed, and the layer thickness of the pulverized raw material does not increase.

According to the pulverizing roller of the vertical pulverizer of the present invention, the pulverized raw material and the pulverized product on the biting side of the pulverizing roller can be compressed to an optimum layer thickness. Moreover, since the width direction of the compression plate is formed in an arc shape in a portion in contact with the pulverized material necessary for compression, compared to a roller shape such as an auxiliary roller, the pulverized raw material and pulverized material falling on the upper surface of the rotary table An area to be deposited can be secured. Therefore, the pulverized raw material and the pulverized material deposited on the rotary table can be efficiently pulverized. Moreover, abnormal vibration does not occur during pulverization.
Also, the compression plate mounting positions are equidistant with respect to the center side or outer peripheral side of the upper surface of the rotary table, and an optimum layer thickness of the pulverized raw material can be formed. Therefore, improvement of pulverization efficiency and abnormal vibration during pulverization can be prevented.

  The present invention is particularly useful for a vertical crusher that crushes raw materials such as cement, coal, and biomass with a crushing roller driven by rotation of a rotary table.

DESCRIPTION OF SYMBOLS 10 ......... Vertical crusher, 12 ......... Casing, 12B ......... Lower casing, 14 ......... Rotary table, 14A ......... Rotary table upper surface, 16 ......... Crushing roller, 16a ......... Roller shaft 20 ......... Upper arm, 22 ......... Lower arm, 24 ......... Hydraulic cylinder, 30 ......... Classifying means, 30a ......... Rotating shaft, 30b ......... Rotating blade, 30c ......... Fixed blade, 30e ......... Inner cone, 30f ......... Feed tube, 32 ......... Raw material inlet, 34 ......... Raw material chute, 40 ......... Round passage, 42 ......... Gas inlet, 44 ...... Upper part 48, ... Dam ring, 50 ......... Compression plate, 60 ...... Shaft, 62 ...... Bearing, 64 ...... Bearing, 66 ...... Lever, 70 ...... Drive part.

Claims (3)

In a vertical pulverizer that pulverizes the pulverized raw material by rotating the pulverizing roller rotatably on the upper surface of the rotary table via the pulverized raw material,
A compression plate is provided along the radial direction of the upper surface of the rotary table on the biting side of the pulverized raw material of the grinding roller on the upper surface of the rotary table;
The compression plate is formed by arranging the longitudinal direction along the radial direction and curving the width direction in an arc shape, and compressing the pulverized raw material on the upper surface of the rotary table with the arc-shaped outer surface. Characteristic vertical crusher.   2. The vertical crusher according to claim 1, wherein the compression plate is attached to a shaft arranged in an axial direction along a radial direction of the rotary table and is rotatable around an axis of the shaft.   The vertical crusher according to claim 1 or 2, wherein an upper end of the compression plate is attached to the shaft so as to be a height of a compression range of the pulverized raw material.

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