JP2016221493A - Vertical mill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vertical mill which enables improvement of the crushing efficiency of crushing rollers and prevents occurrence of abnormal vibration during crushing.SOLUTION: A vertical mill rotatably rolls crushing rollers 16 on a rotary table 14 through a crushing material to crush the crushing material. Shield plates 50 which protrude from a side periphery of the rotary table 14 to the crushing rollers 16 are provided between the rotary table 14 and an annular passage 40 of hot air supplied from below the rotary table 14.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.

Conventionally, in order to improve the pulverization efficiency of the vertical pulverizer by hot air, the vertical pulverizer of Patent Document 1 is provided with a blade ring made of plate blades on the side periphery of the rotary table. By changing the distance between the inner ring and the outer ring, the amount of hot air blown up is made variable according to the state of stone removal.
In the vertical crusher of Patent Document 2, the circumferential speed component of the rotary table is set to be opposite to the circumferential speed direction at the outer peripheral end of the rotary table, and a plurality of partitions are formed on the outer peripheral portion of the rotary table. By providing a member, collision between the pulverized product and hot air can be increased, and the pulverized product can be mixed without stagnation.

Japanese Utility Model Publication No. 63-136739 JP 2000-107619 A

However, since the vertical crushers disclosed in Patent Documents 1 and 2 actively apply hot air to the pulverized material on the rotary table, the pulverized material on the rotary table just before pulverization before the pulverizing roller is also blown away. End up. As a result, the amount of pulverized material dropped and deposited on the rotary table immediately before the pulverizing roller decreased, and the pulverization efficiency was significantly reduced.
In addition, for the purpose of improving the classification efficiency, it is also possible to increase the hot air blowing speed or to design a classifying means with an increased wind speed. This reduces the amount of grinding and increases the running cost of the apparatus. Moreover, since hot air blows up the side periphery of the turntable, the deposits at the outer peripheral end of the turntable are blown off strongly, and the deposited layer thickness on the turntable differs between the inner periphery and the outer periphery. As a result, the layer thicknesses on the large diameter side and the inner diameter side of the pulverizing surface of the pulverizing roller are different, which causes vibrations due to a decrease in pulverization efficiency and variations in the pulverized layer thickness during pulverization.

  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 rotary table via the pulverized raw material. A shield plate is provided between the rotary table and an annular passage of hot air supplied from the lower side of the rotary table so as to protrude from the side periphery of the rotary table toward the upper grinding roller. It is to provide a mold crusher.
With such a configuration, the pulverized raw material and the pulverized material accumulated on the rotary table can be efficiently pulverized without the hot air from the annular passage directly hitting the pulverized raw material and the pulverized material on the rotary table. Moreover, abnormal vibrations do not occur during pulverization by depositing pulverized raw materials and pulverized materials having a predetermined thickness on the rotary table and pulverizing them.

According to the present invention, as a second means for solving the above-described problem, in the first means, the shielding plate is provided on a side of the grinding roller where the grinding raw material is bitten. It is to provide a mold crusher.
By adopting such a configuration, it is possible to maintain the pulverized raw material and the pulverized material immediately before being bitten by the pulverizing roller rolling on the rotary table at a predetermined thickness, improving the pulverization efficiency, Abnormal vibration can be prevented.

According to the present invention as described above, even if the hot air blowing speed from the annular passage is changed in accordance with the debris state of the pulverizer, the pulverized raw material and the pulverized material bitten by the pulverization roller are directly heated. Since the air does not hit, the pulverized raw material and the pulverized material can be deposited on the rotary table. As a result, the amount of biting can be secured and the pulverization efficiency is improved.
Further, in the conventional pulverizer, when the hot air speed is increased for the purpose of improving the classification efficiency, the pulverized material is agitated at the wind speed, and the accumulation on the rotary table is hindered, and the amount of the pulverizing roller is reduced. It was. However, according to the present invention, when the classification efficiency is adjusted by the wind speed, the classification efficiency can be adjusted to an appropriate wind speed without hindering the accumulation on the grinding table. As a result, the pulverized material biting into the roller increases and the pulverization efficiency can be improved.
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 shielding board of this embodiment. It is a top view of the rotary table of a vertical grinder. 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. 3 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 shielding 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 has reached the annular passage 40 without being caught by the grinding roller 16 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.

[Shielding plate 50]
FIG. 1 is a perspective view of the shielding plate of the present embodiment. FIG. 2 is a plan view of the rotary table of the vertical crusher. The shielding plate 50 is a wall in the casing 12 provided between the turntable 14 and the annular passage 40 of hot air supplied from below the turntable 14. The shielding plate 50 is made of a steel plate or the like having a predetermined rigidity similar to that of the casing 12 and protrudes from the side periphery of the rotary table 14 toward the upper crushing roller 16 at a predetermined height. . The projection amount of the shielding plate 50 is such that the hot air blown from the annular passage 40 causes the pulverized raw material and pulverized material on the upper surface 14A of the rotary table to roll up and the amount of deposit on the table does not change. It is set so as to maintain the accumulated state without being affected by the hot air from which the raw material and the pulverized material blow up, that is, set to be higher than the upper surface 14A of the rotary table. One main surface side of the shielding plate 50 is attached to the inside of the casing 12 using a support metal fitting 52 so as to intersect the rotation table upper surface 14A perpendicularly or at a predetermined angle. The support fitting extends from the casing 12 in the horizontal direction and is connected to the other main surface of the shielding plate 50. The other main surface side of such a shielding plate 50 is opposed to the wall surface of the casing 12, and hot air from the annular passage 40 is blown up between these surfaces. At this time, the shielding plate 50 is curved along the outer periphery of the turntable 14, and a slight gap is provided between the one main surface side of the shield plate 50 and the turntable 14 so that hot air does not pass through. Attached.

  Further, the shielding plate 50 of the present embodiment is provided on the side of the grinding roller 16 where the pulverized raw material and the pulverized material are bitten. Thereby, it is possible to maintain the predetermined thickness without being affected by the hot air blowing up the pulverized raw material and the pulverized material immediately before being bitten by the pulverizing roller 16 rolling on the rotary table upper surface 14A. And at places other than the side where the pulverized raw material and the pulverized material are bitten by the pulverizing roller 16, the pulverized material is wound up by hot air that blows up and circulated through the casing 12 to be pulverized into a pulverized material having a predetermined particle diameter. Can do.

  The shielding plate 50 has been described as being configured to be attached to the inner wall of the casing 12 using the support fitting 52, but is configured to project at a predetermined height from the side periphery of the rotary table 14 toward the upper crushing roller 16. In addition to this, it may be configured to be attached to the upper arm 20 of the crushing roller 16 using a support metal fitting.

[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 charged from the raw material charging port 32 to the rotary table upper surface 14A, 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. The table upper surface 14A and the crushing roller 16 are caught and crushed.
And by the hot air which blows off from the annular passage 40 between the outer peripheral surface of the turntable 14 and the inner peripheral surface of the casing 12, the inside of the casing 12 rises 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.

At this time, the crushing raw material and the pulverized material on the pulverization table upper surface 14A are not blown off by the hot air flow by the shielding plate 50, and a predetermined deposition thickness can be maintained on the table. Further, even when the blowing speed of hot air is increased for the purpose of improving the diversion efficiency, the accumulation amount on the upper surface 14A of the rotary table does not decrease due to the agitation of the air flow, and the predetermined accumulation amount bitten by the crushing roller Thus, the running cost of the entire pulverizer is not increased.
In addition, conventionally, hot air blows up the side periphery of the rotary table 14 and the pulverized raw material and pulverized material at the outer peripheral end of the upper surface 14A of the rotary table are blown away strongly, so that the accumulated thickness on the table becomes larger and the inner diameter of the pulverizing roller. The thickness of the pulverizing surface of the pulverizing roller was different and the pulverizing efficiency was reduced and the vibration was generated. Since the predetermined thickness can be maintained, problems such as vibrations due to variations in the pulverized layer do not occur.

According to the pulverization roller of the vertical pulverizer of the present invention, the pulverization that bites into the pulverization roller even when the hot air blowing speed from the annular passage is changed in response to the state of the pulverizer discharged. Since hot air does not directly hit the raw material and the pulverized material, the pulverized raw material and pulverized material at the location where the shielding plate is provided can be deposited on the rotary table. As a result, the amount of biting can be secured and the pulverization efficiency is improved.
Further, when the classification efficiency is adjusted by the wind speed, it can be adjusted to an appropriate wind speed without hindering the accumulation on the pulverization table, so that the pulverized matter biting into the roller increases and the pulverization efficiency can be improved.

  The present invention is particularly useful for a vertical crusher that crushes raw materials such as 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 Take-out port, 48 ... Dam ring, 50 ... Shield plate, 52 ... Support bracket.

Claims (2)

In a vertical pulverizer that pulverizes the pulverized raw material by rolling the pulverizing roller rotatably on the rotary table via the pulverized raw material,
A shielding plate is provided between the rotary table and an annular passage of hot air supplied from the lower side of the rotary table so as to protrude from the side periphery of the rotary table toward the upper grinding roller. A vertical crusher.   The vertical crusher according to claim 1, wherein the shielding plate is provided on the crushing side of the crushing raw material of the crushing roller.

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