JPS6128470A - Vertical type 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 vertical mill in which rollers are rotated under pressure on a table having a vertical axis of rotation to grind raw materials between the table and the rollers.

BACKGROUND ART FIG. 6 is a sectional view showing a partial cross section of a prior art vertical mill, and FIG. 7 is a plan view of the vicinity of the arm 2. The vertical mill shown in Fig. 6 basically consists of a casing 1, an arm 2 provided inside the casing l, and a casing l of the arm 2.
a bracket 3 fixed to one end opposite to the bracket 3, a roller 4 rotatably provided on the bracket 3, a tensioning means 5 connected to the bracket 3 to pull the bracket 3 diagonally downward in FIG. 6, and a roller 4. and a rotatable table 11 in pressure contact with the table 11.

One end of the arm 2 is pin-coupled to the casing l by a pin 6 so as to be freely angularly displaceable. The other end of the arm 2 is a roller 4
It is fixed to a bracket 3 that supports the.

The plurality of tensioning means 5 include a rod 7 and a hydraulic cylinder 8. The end of the rod 7 opposite the hydraulic cylinder 8 is connected to a hook 9 of the arm 2 .

In the vertical mill having the above-mentioned configuration, the tensile force of the pair of rods 7 pulling the arm 2 downward in FIG. Therefore, the above-mentioned tensile force is approximately equal to the pressing force with which the roller 4 presses against the table 11.

Further, in order to prevent the pair of rods 7 from coming into contact with the table 11, they must be placed radially outward of the table 11. Therefore, if the radius of the table 11 becomes larger, the bracket 3 will correspondingly extend longer in the width direction. Since the pair of rods 7 are connected to the bracket 3 as described above, there is a problem in that the structure becomes large.

FIG. 8 is a partial cross-sectional view of another prior art vertical mill.

The bracket 21 is connected to the casing 20 by a shaft portion 25 so as to be angularly displaceable. The bracket 21 is the roller 2
2 is supported in the bearing part 26.

Tensioning means 23 includes a cylinder 27 and a rod 28. The bracket 21 is a connecting piece 2 that is integrated with the bracket 21.
It is connected to the tensioning means 23 by a pin 30 passing through the tensioning means 23 . In the prior art as shown in FIG. 8, the structure is prevented from increasing in size as described in FIG. 6.

The force acting on the table 24 by the roller 22 is fl, and the force acting on the casing 20 by the shaft 25 is f.
2, and the force acting on the bracket 21 from the tensioning means 23 is f. Said f, fl.

f2 is parallel to the direction in which the rod 28 extends.

Further, the distance between the roller 22 and the aforementioned pin 30 is ll,
The distance between the pin 30 and the aforementioned shaft portion 25- is assumed to be 12. Further, the distance between the roller 22 and the shaft portion 25 is assumed to be l. At this time, when the pressure contact force f1 is generated, the shaft portion 25 is connected to the casing 20.
The force f2 given to is expressed by the following formula % Formula % The tensile force f requires a force expressed by the following formula.

f=(l!1+/2)・fl/l! 2... (2) According to the above-mentioned equation 1 and equation (2), the pressure contact force f1 causes a force expressed by equation (1) from the shaft portion 25 to the casing 20, and the pressure contact force Since f1 acts as a part of the tensile force f as shown in equation (2), in order to increase the pressure contact force f1, the tensile force f of the tensioning means 23 must be further increased. Therefore, the tensioning means becomes larger and the strength of the casing 20 must be increased. Therefore, a new problem arises in that both the casing 20 and the tensioning means 23 are burdened with increased responsibility, and costs are significantly increased.

Purpose The purpose of the present invention is to provide an improved vertical mill that solves the above-mentioned technical problems, simplifies and reduces the weight of the tensioning means, and eliminates the need to unnecessarily increase the strength of the casing. It is.

Embodiment FIG. 1 shows a roller 45 of a vertical mill according to an embodiment of the present invention.
It is a sectional view of the vicinity. FIG. 2 is a sectional view of the vertical mill of FIG. 1. FIG. 3 is a simplified perspective view of the vicinity of the table 42 of the vertical mill shown in FIG. A table 42 having a vertical rotation axis A is arranged in a casing 41 of the vertical mill 40, and the table 42 is rotationally driven by a driving means 43. This table 42 includes a table main body 4
2b and a table 42 fixed to the table body 42b.
42a. A supply pipe 44 concentric with the axis of rotation A is arranged above the table 42 in FIG. This supply pipe 4
4 supplies the material to be crushed, such as a raw material for cement.

A plurality of (three in this embodiment) crushing rollers 45 are arranged on the table 42 at equal intervals in the circumferential direction. This crushing roller 45 is rotatable around the rotation axis B and is pressed against the table liner 42a. This crushing roller 45 is supported by a bracket 46, and is rotatably supported via a support portion 47 of the bracket 46. A portion of the bracket 46 on the side opposite to the support portion 47 extends outside the casing 41 of the vertical mill 40 and is connected to the support member 48 via a shaft portion 49 so as to be freely angularly displaceable. There is.

The rotational axis B of the crushing roller 45 extends in the radial direction of the table 42, and is inclined downward in FIG. 2 toward the radial inside of the table 42. Moreover, the bracket 46 is
A tensioning means 52 including a rod 50 and a piston 51 pulls the table liner 42a outward in the radial direction.
It is pulled in a direction that slopes downward in the figure.

The material to be crushed that is introduced from the supply pipe 44 falls near the center of the table 42 . At this time, since the table 42 is rotationally driven, the object to be crushed enters between the table liner 42a and the crushing roller 45 by centrifugal force and is crushed. This pulverized material to be pulverized is blown up by air from the jet port 53. A classifier 54 is installed inside the casing 41, and the classifier 54 has an inverted conical cone 55 having the same axis as the supply pipe 44, and is rotated around the vertical axis inside the cone 55. It includes a classification blade 56 and a guide blade 57 that guides the fine powder crushed and suspended by the roller 45.

As mentioned above, the material to be crushed is blown up in the casing 41 upward in FIG. It is fed and classified by the classification blade 56. The fine powder pulverized to a sufficiently small size is discharged from the outlet 59.

The material to be crushed whose particle size is not sufficiently crushed falls inside the cone 55 to the lower part of FIG. 2, and falls onto the table 42 together with the material from the supply pipe 44, where it is crushed again.

The bracket 46 and the support member 48 can be fixed to each other by installing a pin 60.

A fixing member 61 is provided on the lower surface of the support member 48 in FIG.
is fixed. The fixing member 61 is formed into a ring shape that surrounds the casing 41 and is not fixed to the casing 41 as shown in the third figure.

Below the fixing member 61 in FIG. 1, when the fixing member 61 is lowered downward in FIG.
A stop member 62 is provided for stopping 1 at a predetermined position. The stop member 62 may be formed in the shape of a ring surrounding the casing 41 as shown in the third figure, or may be a suitable short bracket. At this time, the above-mentioned fixing member 61 is provided outside the casing 41 and above the stop member 62 so as to be displaceable in the vertical direction in FIG.

At this time, when the aforementioned pin 60 is attached as shown in FIG. 3, the pin 60 prevents the roller 45 and the bracket 46 from rotating about the shaft portion 49. When the roller 45 is in pressure contact with the table 42, the lower end of the fixing member 61 is spaced apart from the stop member 62.
installed above it.

A connecting piece 63 is integrally provided at the lower part of the bracket 46, and the connecting piece 63 and the rod 50 are connected by a pin 64. Here, the rod 50 and the hydraulic cylinder 51 constitute a tensioning means 52. Also casing 4
1 is provided with a lid body 65 that is fixed to the casing 41 with screws (not shown), and as described later, the roller 45
During maintenance, the lid 65 can be removed from the casing 41 to expose the rollers 45 and the like to the outside of the casing 41.

The tension means 52 pulls the bracket 46 with a first tension F1.
As a result, the roller 45 is brought into pressure contact with the table liner 42a, and the roller 45 is pulled downward in the figure.
It receives the reaction force of FO from 2a.

In this state, the fixing member 61 is separated from the stop member 62 as described above. At this time, all rollers 45
And if the overall weight of the bracket 46, the support member 48, and the fixing member 61 is W, then each force F1.
During F2, the following formula approximately holds true.

FO=F1+W/3...(3) In this way, the tensile force F2 moves the roller 45 to the table liner 42a.
It becomes part of the pressure force that presses against the In addition, it was possible to prevent a force such as the force f2 of formula (11) from acting on the casing 41, for example.

During maintenance of the roller 45, etc., the lid 65 is opened outward from the casing 41, the pin 60 is removed,
Also, a pin 6 connecting the tensioning means 52 and the bracket 46
Remove 4. Next, the roller 45 and the bracket 46 can be angularly displaced about the shaft portion 49 in the direction of the arrow C and exposed to the outside of the casing 41. At this time, roller 45. The bracket 46 and the like are angularly displaced around the shaft portion 49 such that the portion furthest away from the shaft portion 49 has a trajectory indicated by a virtual line 100 in FIG.

That is, the rollers 45 and the like pass through a region radially inward of the virtual line 100. At this time, the fixing member 61 descends downward in FIG. 1 and stops by coming into contact with the stop member 62. In this way, maintenance of the rollers 45 and the like can be easily performed.

In this embodiment, as described above, no force derived from the tensile force F1 is applied to the casing 41. Therefore, it is not necessary to increase the mechanical strength of the casing 41 unnecessarily. Further, as shown in equation (3), all of the tensile force F1 effectively acts as the above-mentioned pressing force.

As described above, the casing 41 and the tensioning means 5
Second, it is possible to simplify and reduce the weight of related mechanisms. Furthermore, maintenance work on the rollers 45 and the like can be easily performed.

The pin 60 in the embodiment shown in FIG. 1 fixes the bracket 46, which is angularly movable around the shaft portion 49, at a predetermined position. It is set up so that you can easily do 10 things. At this time, as another embodiment, the pin 60 is not provided,
The support member 48 and the bracket 46 may be integrally formed by, for example, welding.

FIG. 4 shows a roller 45 of a vertical mill according to another embodiment of the present invention.
It is a sectional view of the vicinity. FIG. 5 is a perspective view of the vicinity of the table 42 of the vertical mill shown in FIG. Other embodiments of the present invention are shown in FIGS. 4 and 5.

This embodiment is similar to the previous embodiment, and corresponding parts are given the same reference numerals. What is noteworthy about this embodiment is that the portion of the bracket 46 facing the roller 45 is formed so as to cover the upper portion of the roller 45 in FIG. 4, and as shown in FIG. This is because a connecting member 67 is provided.

Each bracket 46 is connected to a connecting member 67 via a pin 68. Also, the bracket 46 is connected via pin/64.
It is connected to a tensioning means 52 and pulled outward in the radial direction of the table 42 and diagonally downward in FIG.

The distance between the axis of the roller 45 and the pin 64 is Ll, and the distance between a straight line parallel to the axis and passing through the pin 64 and a straight line parallel to the axis 1sD and passing through the shaft portion 49 is L2. Further, the distance between the lowermost end of the roller 45 and a straight line passing through the pin 68 and parallel to the left-right direction in FIG. 4 is defined as L3.

In addition, the roller 45 and the table liner 42
A reaction force FO of the pressure contact force is applied by the contact portion with a. A tensile force F1 is applied to the bracket 46 from the tensioning means 52 via the pin 64. A force F2 is applied to the bracket 46 by the connecting member 67 via the pin 68. Furthermore, the outer part of the casing 41 allows the bracket 46 to
Force F3 acts via the aforementioned support member 48.

Here the forces FO, F'l, F2. F3 and the aforementioned length L
l, L2. The following equation approximately holds true during L3.

FO=F1+W/3...(3) LIF
1=(L1+L2)F2+L3F3...(4
) where W is the number of rollers 45. This is the weight including the bracket 46 supporting member 48, the connecting member 67, and the fixing member 61.

At this time, as shown in equation (3), the tensile force F1 acts effectively as a pressure contact force, and for example, a state in which part of the tensile force does not act effectively as shown in equation (2) is prevented. It's broken.

Also, considering the case where the connecting member 67 is not provided,
The force F2 acting on the support member 48 by the bracket 46 is when F3=0 in equation (4), and is F2-(L
1+L2)Fl. Therefore, as it stands, it is necessary for the fixing member 61 to have relatively high mechanical strength. However, by providing the connecting member 67 as in this embodiment, if most of the moment for LIFI is received by LaF3, it becomes O in F2, and the occurrence of F2 can be prevented.

At this time, the force F3 acting on the connecting member 67 acts as a tensile force on the connecting member 67, as shown in FIG. Also, this force F3 can be calculated by adding F2=0 to equation (4), F3
=-mmFl. Since generally L3>>Ll, the force of F3 is extremely small. Connecting member 6
7 may be a member that can withstand a small tensile force, and may be a member short enough to connect the roller brackets, so there is no need to increase the mechanical strength unnecessarily, and a light member can be used. Roughly from F2=0, fixing member 6
1 may be an extremely light member, and even including the connecting member 67, the overall weight is reduced.

In a vertical mill having the above-mentioned configuration, rollers 4
During maintenance such as 5, the lid 65 is opened to the outside of the casing 41. Pins 60, 64.

By removing the roller 45 and the bracket 46 , the roller 45 and the bracket 46 can be angularly displaced counterclockwise around the shaft portion 49 and exposed to the outside of the casing 41 . In other words, the trajectory of the outermost circumference of the roller 45 is the virtual line l.
Angular displacement as indicated by OO.

In this way, maintenance work on the rollers 45 and the like can be easily performed, as described above.

In the embodiment of FIG. 4, the connecting member 6 is
7 and the bracket 46, the connecting member 6
7 and the bracket 46 may be integrally formed by, for example, welding.

In the embodiments shown in FIGS. 11!1 and 4, the rod 50 of the tensioning means 52 is connected to the bracket 46 at a position close to the roller 45, but it is connected to the bracket 46 at a position away from the roller 45. You can leave it there.

Effects According to the present invention as described above, the tensioning force can directly act as part of the pressure contact force, so that the tensioning means can be simplified and lightened. Also, since a part of the tensile force is prevented from acting on the casing, there is no need to unnecessarily increase the strength and strength of the casing.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the vicinity of the roller 45 of an embodiment of the present invention, FIG. 2 is a simplified cross-sectional view of the vertical mill shown in FIG. 1, and FIG. 3 is a table of the vertical mill shown in FIG. 1. Perspective view near 42,
FIG. 4 is a sectional view of the vicinity of the roller 41 of another embodiment of the present invention, FIG. 5 is a perspective view of the vicinity of the table 42 of the vertical mill of FIG. 4, and FIG. 6 is a roller of the prior art vertical mill. 7 is a plan view of the vicinity of the roller 4 of the vertical mill of FIG. 6, and FIG. 8 is a sectional view of the vicinity of the mouth to 222 of the vertical mill of the previous two techniques. 41...Casing, 42...Table, 44...
-Bracket, 45...Roller, 46...Supporting member, 47...Shaft portion, 48...Pin, 49...Fixing member, 50...Stopping member, 53...Tensioning means , 56・
...Lid, 57...Connecting member, 61...Fixing member Agent Patent attorney Kei Nishi Part Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (2)

[Claims] (1) A rotatable table having a vertical axis of rotation, a roughly cylindrical casing surrounding the table and extending vertically, and a casing having a radial axis of rotation of the table. , a plurality of crushing rollers disposed on a table; and for each crushing roller, a bracket that is located radially outward of the table and supports the crushing roller, and a portion of the bracket extends outside the casing; The fixing member is not fixed to the casing but surrounds the casing in an annular shape, and the part of each bracket is fixed in common; and a tensioning means for pulling the bracket so that the roller is pressed against the table. Vertical mill. (2) The vertical mill according to claim 1, further comprising a connecting member disposed within the casing and connecting the brackets in common.