JPS62204862A - Roller apparatus of vertical mill - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a roller device suitably used in a vertical mill for grinding raw materials such as slag.

BACKGROUND ART FIG. 7 is a sectional view of a portion of a conventional vertical mill 1. The configuration of the vertical mill 1 will be explained with reference to FIG. A table 3 having a vertical axis of rotation is provided within a casing 2 having a roughly right cylindrical shape. The table 3 includes a table liner 3a and a table body 3b. This table 3 is rotationally driven by a drive device fff4.

A plurality of rollers 5 having support shafts 6 are arranged on the table 3 at intervals in the circumferential direction, and are pressed against the table 3 by a structure not shown. Further, below the table 3 of the casing 2, a blower lower is provided for blowing hot air, and the hot air is blown upward into the casing 2 through a blower duct 8 and a nozzle 9 surrounding the table 3.

The raw material supplied onto the table 3 is moved radially outward by the centrifugal force accompanying the rotational drive of the table 3, and is caught between the row 25 and the table liner 3a and pulverized.6 The obtained pulverized material is further moved radially outward by centrifugal force, and is blown upward in the casing 2 by the gas flow from the nozzle 9, causing the classifier r! 1 (not shown)
After being classified by the casing 2, the obtained fine powder is taken out of the casing 2.

In the conventional vertical mill 1 having such a configuration and operation, the raw material pulverization operation is carried out by the table liner 3 of the roller 5.
This is achieved by compression pulverization by a reduction blade to a, and pulverization by relative sliding force based on the difference between the peripheral speed of the roller 5 and the peripheral speed of the table liner 3a. In particular, the grinding operation is essential for finely pulverizing the raw material, and basically defines the performance of the vertical mill 1.

FIG. 8 is a graph explaining the crushing operation.

The crushing operation of the vertical mill 1 will be explained with reference to FIGS. 7 and 8. The convention of the graph is the radius of table 3,
The radius along the axial direction of the roller 5 is also shown. Moreover, the vertical axis is the peripheral speed. The radius of the roller 5 gradually increases in the axial direction, reaches the maximum value, and then gradually i! do. That is, the circumferential speed of the roller 5 is indicated by the line 12'1 in FIG.

On the other hand, the peripheral speed of table 3 is the line of the tjSB diagram! 2
increases linearly as shown in .

Equifar point P1 where the peripheral speeds of row 25 and table 3 match
In the f;rL region closer to the origin of the graph, the circumferential speed of the row 25 is greater than the circumferential speed of the table liner 3a. The relative speed (1) in this region is relatively small, and therefore the table liner 3a is mainly compressed and pulverized by the rolling blade of the roller 5. In a region opposite to the origin from the constant velocity point P1, the circumferential speed of the table liner 3a is greater than the circumferential speed of the roller 5.

The relative velocity (2) in this region is relatively large, and therefore grinding mainly occurs due to relative sliding force.

Therefore, in the axially outer region of the row 25 that performs the grinding, the outer peripheral surface of the row 25 facing the table liner 3a wears out more than the axially inner outer peripheral surface (hereinafter referred to as uneven wear). There was a problem with this.

Another conventional technology that attempts to solve these problems is f.
jS9. This conventional roller device f? 21
0 includes a support shaft 6 and rollers 11 and 12 rotatably attached to the support shaft 6, respectively.

These rollers 11 and 12 are mounted on the support shaft 6 with bearings 13, respectively.
．． 14, and are individually rotatable.

FIG. 10 is a graph showing the operating state of the roller device 10 shown in jm9. Table liner 3 as shown in FIG.
The circumferential speed of a changes linearly as shown in line no. 36
Also, the circumferential speed of rollers 11 and 12 is line! 4.75.

Problems to be Solved by the Invention In such a prior art a-ra device io, the a-ra 11 and 12 each having a divided shape along the axial direction of the support shaft 6 are rotatably attached. , the relative speed between the roller 11 and the table liner 3a is reduced compared to the case of the prior art described above, and therefore the uneven wear of the row 211 is eliminated, but due to this decrease in relative speed, the friction due to the configuration shown in the m7 is The degree of grinding is reduced and therefore the ability to produce fine powder is unnecessarily reduced,
Furthermore, there is a problem in that the pulverization efficiency decreases and there is a limit to the pulverization of the raw material.

The object of the present invention is to solve the above-mentioned problems, to be able to produce fine powder of a desired degree, and to use a roller device.
An object of the present invention is to provide an improved roller device for a vertical mill that can significantly extend its life.

Means for Solving the Problems The present invention provides a roller device for a vertical mill that crushes raw materials by being pressed against a table having a rotation axis extending in the vertical direction within a housing, and having the rotation axis extending in the radial direction of the table. This roller device for a vertical mill is characterized in that it is divided into a plurality of parts that can be divided in the axial direction, and each of these parts is fixed to each other and driven to rotate.

Operation The roller device of the vertical mill according to the present invention has a rotation axis extending in the radial direction of the table, and is divided into a plurality of parts that can be divided in the axial direction. These parts are mutually fixed and rotationally driven.

Therefore, by appropriately selecting the material of each of these parts, it is possible to prevent the outer part in the radial direction of the table from wearing out more than the rest of the divided parts of the roller device. Therefore, the lifespan of such a roller device can be extended, and since these parts are integrally fixed and driven by oral transmission during operation, frictional pulverization during the raw material pulverization operation can be achieved to the desired degree. Therefore, the desired fine powder production ability can be obtained.

Embodiment FIG. 1 is a sectional view of a portion of a roller device 20 according to an embodiment of the present invention, and FIG. 2 is a sectional view of a vertical mill 21 provided with the roller device 20. 61 r& of this embodiment will be explained with reference to the rjSl diagram and FIG. The vertical mill 21 of this embodiment has a generally cylindrical housing 22, and a table 23 having a rotation axis extending in the vertical direction is disposed inside the 7% housing 22, and is rotationally driven by a drive device 24. Ru. The table 23 includes a table liner 25 and a table body 26, and a plurality of glues 227 are arranged on the upper surface thereof at intervals in the circumferential direction.

The support shaft 28 of the roller 27 extends along the radial direction of the table 23 and is pivotally fixed to the arm 29 by a pivot 30.

The arm 29 is connected to a pressure means 31 extending outward from the housing 22, and the pressure means 31 causes the row 227 to
It is pressed against the table liner 25. Also table 23
A supply chute 32 is provided above the table 23 for supplying the raw material to be crushed onto the table 23, and the tip thereof opens above the rotation center of the table 23.

Further above the table 23, a cone 33 having an inverted truncated cone shape is provided, the lower end of which opens above the rotation center of the table 23. Moreover, between the upper part j1 and the ceiling plate 34 of the housing 22, a large number of collision blades 35 are arranged in the circumferential direction. After entering the cone 33 through the gap 36 between the upper end of the cone 33 and the ceiling plate 34 and between the collision blades 35, the gas containing the pulverized powder and granules is , configured to be pivoted within the cone 33.

A plurality of rotating blades 37 are arranged radially inward of the cone 33 at intervals in the circumferential direction. The lower end of each rotary blade m37 is commonly fixed to the support member 38, and
8 is fixed to a rotating shaft 40 which is rotationally driven by a driving device 39. Further, a discharge duct 41 is provided in the radially inner portion of the rotary blade 37 of the ceiling plate 34 for taking out the fine powder obtained by classification.

Further, in the housing 22, below the table 23, there is an air outlet 42 for blowing hot air into the housing 22.
is provided, and the blown hot air is passed through a blower duct 43 to a nozzle 4 provided surrounding the table 23.
4, the air is blown up from below to above over the entire circumference of the table 23.

Further, the loaf device 20 provided in the vertical mill 21 is
For example, a right cylindrical shape, which is rotatably attached to the support shaft 28 via bearings 45 and 46 that receive radial force, is attached to the member 47, and the attachment is made to the outer peripheral surface 48 of the member 47 in the radial direction with respect to the thin wire of the support shaft 28. The axial length Ll of the support shaft 28 with respect to the pongee [49] is smaller than the axial length L2 of the member 47, and the table 23
The roller 27 includes an fjSi segment 51 that is a component of the roller 27 and has a tapered surface 50 that tapers outward in the radial direction.

Further, a second segment 53 having a tapered surface 52 having a shape corresponding to the tapered surface 50 of the ml segment 51 is provided. Regarding the thin wire 49 of the second segment 53,
The radially inner circumferential surface likewise fits smoothly against the radially outer circumferential surface 48 of the member 47. These first segments 51, 53 are attached to member 47 by bolts 54, 55, respectively. That is, by using the above h1 configuration, the first and second segments 51 and 53 constituting the roller 27 can be attached and separated from the member 47 by the respective attachment points 54 and 55, In addition, when performing the crushing operation, these rjSl and fjS2 segments 51.53 are
It is attached to the member 47 using bolts 54 and 55, and together constitutes the row 227.

Here, the ml and rjS2 segments) 51.53 may be made of the same material, and the fjS2
Segment 53 may be formed from a harder material than first segment 51, where second segment 53 is
When formed from a material with higher hardness than the first segment 51,
It is possible to reduce as much as possible the occurrence of uneven wear in the prior art described with reference to FIGS. 7 and 8. In this way, the service life of the row 227 can be significantly extended, and since the ml and c/l I$2 segments 51 and 53 are rotated integrally and come into contact with the a-ra 25, the raw material A desired fine powder can be obtained in the crushing operation. In addition, maintenance and inspection operations are easy, and f
The η structure can also be made smaller.

Furthermore, since the materials of the 11th segment 51 and the second segment 53 can be changed, the cost can be reduced compared to an integrated roller.

FIG. 3 is a sectional view of a roller device 10b according to still another embodiment of the present invention. This embodiment is similar to the embodiment described above, for example, shown in the first drawing, and corresponding parts are given the same reference numerals. The noteworthy point of this embodiment is that the support shaft 28 has a bearing 45.4.
The substantially cylindrical mounting which is rotatably mounted by the member 47 is provided with a concave groove 57 extending over the entire circumference on the radial outer circumference of the member 47 with respect to the axis 49, and the member 47 is mounted by the member 47 and bolts 54 and 55 are used for the mounting. is the first fixed to member 47
Also, five concave grooves 58° are formed on the inner circumferential surfaces of the second segments 51 and 53 in the radial direction of the axis 49, respectively.

Further, the ground surface 60 of the first segment 51 on the radially outward side of the table 23 is configured to form a tapered surface that tapers toward the radially outward side of the table 23, similarly to FIG. Also, the mounting is done by the member 47 and the bearings 45, 46.
The respective attachments are fixed with bolts 62. Furthermore, even with the roller device 10b having such a configuration, the same effects as those described in the above-mentioned embodiments can be obtained.

FIG. 4 is a diagram illustrating the principle of operation of the tall roller devices RA20, 20a, and 20b with reference to FIGS. 1 to 3. FIG. In FIG. 4, the reference numeral 49 is the IwI line 49 used in FIGS. 1 and 3, and the reference 1f-
61 is center #i6 used in Fig. 1 and Pt53
It is 1. Hereinafter, the principle of the moving ear of the roller device 20 will be explained with reference to FIG. 1 as well. In Figure 4,
Reference numeral FO is a reaction force acting from the table 2 liner 25 when the roller 27 is pressed against the table liner 25, and F is a force applied to the roller from the pressing means 31 through the support shaft 28, which balances FO. By appropriately selecting the distance L1 and the angle of the 1-tapered surface 50, FO and F create a 5'0 taper surface, and a force that causes the first segment 51 and the second segment 53 to separate from each other is created. produces F1. The force F1 that tries to separate is the mounting force) 54.5
5, the attachment creates a tensile force on the member 47 and the first and second segments 51.53, and the attachment ensures that the member 47 is securely fixed and stable. can be maintained in the same condition.

Therefore, even if the roller 27 rotates around the axis 49 as the table 23 rotates,
It is possible to continue the luck of the pine in a stable manner without mutual deviation or wobbling.

FIG. 5 is a sectional view showing the configuration of a roller device 20c according to still another embodiment of the present invention, and FIG. 6 is! ml segment 5
1 (or a second segment 53). Fifth
The structure of this embodiment will be described with reference to the drawings and FIG. 6. This embodiment is similar to the above-described embodiment, and corresponding parts are given the same reference numerals. A notable feature of this embodiment is that, for example, the end face of the first segment 51 facing the second segment 53 has a shape in which convex portions 63 and concave portions 64 are repeatedly formed in sequence. The convex portion 63 includes a first slope 65, a top surface 66 continuous to the fjS1 slope 65, and a second slope 67 formed on the opposite side of the f51 slope 65 with respect to the top surface 66.

Here, the inclination angle θ1 of the first slope 65 and the m2 slope 67 is
．． θ2 are equal to each other, and the circumferential lengths of the top surface 66 and the four portions 64 are the same L3. L4 are each made equal. Therefore, the first segment 51 and the second segment 53 have the same shape.

By using such a configuration, it is possible to realize the effects described in the above-mentioned embodiments, and at the same time, the inclination angle θ1. By increasing θ2, it is possible to further improve the degree of mutual fixation compared to the previous embodiment in the state where rjSl and l/f:tS2seg/:z) 51.53 are combined. can.

Further, in this embodiment, tjSl and the second segment 51
．． Since 53 has the same shape, such a roller arrangement r
! Even if the first segment 51 is more worn than the second segment 53 due to the use of ttS
Not only can one segment 51 be replaced with a new one, but also the second segment 53 and the worn first segment 51 can be replaced with each other to continue use.

In other words, a roller configured like this! ! fi 20c
, its service life can be further extended.

Effects As described above, the roller device of the vertical mill according to the present invention has the following effects:
The table has a rotating thin wire extending in the radial direction of the table, and is divided into a plurality of parts that can be divided in the axial direction. These parts are mutually fixed and rotationally driven. Therefore, by appropriately selecting the material of each of these parts, it is possible to prevent the outer part in the radial direction of the table from wearing out more than the rest of the divided parts of the roller device. Therefore, not only can the life of the roller device be extended, but also
Since each of these parts is integrally fixed and rotationally driven during operation, frictional pulverization in the raw material pulverization operation can be performed to a desired degree, and thus a desired fine powder production ability can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a roller device 20 according to an embodiment of the present invention;
Fig. fjS2 is a sectional view of a vertical mill 21 equipped with a roller arrangement RA20, Fig. 3 is a sectional view of a roller arrangement RA20b of still another embodiment of the present invention, Fig. Pt54 is a diagram explaining the present invention in detail, tjS5 The figures are a sectional view of a roller device ji 20c according to still another embodiment of the present invention, FIG. 6 is a perspective view of the first segment 51 or the second segment 53, and FIG.
FIG. 8 is a graph explaining the operation of the vertical mill 1; FIG. The figure is a graph showing the operation of the roller device r1110. 20.20m, 20b, 20c・ry-ra device, 21
- Vertical mill, 22... Hashing, 23... Table, 25... Table liner, 27... Roller, 28... Support shaft, 45.46... Bearing, 47...・
Mounting member, 49... Thin wire, 50.52... Taper surface, 51... ml segment, 53... fJS2 segment, 54.55... Mounting bolt, 56.60...
・End face, 61...Center line, 62...Mounting bolt, 6
3...Concave portion, 64...Convex portion, θ1゜θ2...Inclination angle Agent Patent attorney Keiichi Saikyo Figure 2 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Scope of Claims] A roller device for a vertical mill that is pressed against a table having a rotation axis extending in the vertical direction within a housing to crush raw materials, and having the rotation axis extending in the radial direction of the table, the roller device having the rotation axis extending in the radial direction of the table; A roller device for a vertical mill, characterized in that the roller device is divided into a plurality of parts that can be divided into two parts, and each of these parts is fixed to each other and driven to rotate.