JP3569174B2 - Roller support structure of vertical mill - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical mill for compressing and crushing an object to be crushed between a rotary table and a roller.
[0002]
[Prior art]
As shown in FIGS. 5 and 6, the vertical mill supports a roller 3 located above a rotary table 2 in a casing 1 so as to be vertically swingable on the casing 1 and presses the roller 3 with a pressing means. 4 urges the rotary table 2 to press the crushed material a between the rotary table 2 and the roller 3 to compress and pulverize. Generally, as shown in FIG. After the material b is dropped from the rotary table 2 and collected, as shown in FIG. 6, air c is sent from below the rotary table 2, the crushed material b is put on the rising airflow, and classified by the classifier 5. In some cases, only fine crushed material b is discharged from the casing 1 and collected by a bag filter or the like.
[0003]
In these vertical mills, there are various types of means for supporting and pressing the roller 3, and as one means, as shown in FIGS. 5 and 6, a swing block 6 that rotatably supports the roller 3. In some cases, the both-side support shaft 7 is rotatably supported by the casing 1 and the arm 8 on the swing block 6 is pressed by a hydraulic cylinder 9 or a spring. As another means, as shown in FIG. 7A, a support shaft 7 is provided below the swing block 6, and a hydraulic cylinder 9 is connected to the roller 3 side of the swing block 6, or as shown in FIG. As shown in b), there is a type in which a lever portion is provided below the swing block 6, the center of the lever portion is supported by a support shaft 7, and the lower end is connected to a hydraulic cylinder 9 by a pin.
[0004]
In each of these supporting and pressing means, the support shaft 7 is supported by a bearing provided on the casing 1. As shown in FIGS. 5 and 6, the bearing 10 is fixed to the casing 1 as shown in FIG. The support shaft 7 is fitted into the bearing 10 via a sleeve 11 and a bush 12. In the figure, 13 is a bearing stopper, 14 is a grease nipple, and 15 is an oil seal.
[0005]
[Problems to be solved by the invention]
In the support structure of the support shaft 7, the sleeve 11 is generally made of an iron-based hard metal to protect the support shaft 7, and the bush 12 is made of a soft metal such as gunmetal. The bush 12 is fixed to the support shaft 7 or the bearing 10 by an interference fit. It is injected from the nipple 14. The gap S depends on the diameter of the support shaft 7, but is generally about 0.02 to 0.05 mm.
[0006]
In this support shaft structure, the sleeve 11 and the bush 12 are in partial contact due to the gap S, and the swing block 6 constantly swings, so that only the contact portion is worn. Further, since the contact portion is used for the swing operation, the contact portion is limited to a specific portion of the swing surface, and it is not possible to avoid uneven wear in which only the specific portion is worn. For this reason, conventionally, as described above, the bush 12 is made of a soft metal such as a metal shell, and uneven wear is concentrated on the bush 12. When uneven wear progresses and smooth sliding cannot be performed, Only 12 are to be replaced.
[0007]
However, since the replacement must be performed only by a partial defect due to uneven wear, for example, if the vertical mill is operated for 10,000 hours, the replacement must be performed. Replacement of the bush 12 causes cost and production loss due to interruption of operation.
[0008]
An object of the present invention is to extend the life of a bush under the above circumstances.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, the wear points of the bush are sequentially shifted in the circumferential direction. If they are sequentially displaced, wear at the same location for a long time does not occur, that is, uneven wear does not occur, and a long-term smooth rotation (sliding) can be obtained between the sleeve and the bush. That is, the replacement span of the bush can be lengthened.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
As an embodiment of the present invention, in a vertical mill for compressing and pulverizing an object to be crushed between a rotary table and a roller as described above, the support shaft of the roller is rotatable to a bearing of a casing via a bush and a sleeve. , A sleeve is fitted to the support shaft by interference fit, a bush is rotatably fitted between the sleeve and the bearing, and the bush is formed of a softer metal than the sleeve.
[0011]
As described above, if the bush is rotatable (slidable) and is made of a softer metal than the sleeve, the bush gradually rotates while wearing as the roller support shaft swings, causing uneven wear. Difficult (see Example for details of this action).
[0012]
【Example】
One embodiment is shown in FIGS. 1 to 3, in which, as described above, 1 is a casing of a vertical mill, 2 is a rotary table provided in the casing 1, and 3 is provided above the rotary table 2. The crushing roller 6 is a hydraulic cylinder mounted on the inspection cover 1a provided on the casing, and the swing block 9 rotatably supporting the roller 3 is provided.
[0013]
Reference numeral 10 denotes a bearing that supports the support shaft 7 fixed to the inspection cover 1a. A bracket 16 is attached to the bearing 10, and a stopper bolt 17 is screwed into the bracket 16. On the other hand, a protrusion 18 is formed on the bearing stopper 13, and the downward movement (rotation) of the roller 3 is regulated by the tip of the stopper bolt 17 abutting on the protrusion 18. Reference numeral 19 denotes an opening / closing cylinder rod for opening and closing the inspection cover 8.
[0014]
As shown in FIG. 3, the support shaft 7 protruding from the swing block 6 is fitted around the sleeve 11 with an interference fit (shrink fit). A bush 12 is fitted in the bearing 10 fixed to the inspection cover 1a with a loose fit. In addition, since the bush 12 is provided with a through hole through which grease passes, the inner and outer surfaces of the bush 12 are also filled with grease from the grease nipple 14.
[0015]
In this embodiment, the bush 12 has an inner surface in partial contact with the sleeve 11 at a portion a, and an outer surface with the bearing 10 at a portion b, as shown in FIG. Since the swing range W of the roller 3 is limited, the portions a and b have an almost constant angle with respect to the center point of the support shaft 7.
[0016]
Now, it is assumed that the sleeve 11 and the bush 12 slide and oscillate in the portion a on the inner surface side of the bush 12. When the sliding is repeated, the portion a is worn and the frictional resistance is increased, the portion b on the outer surface side of the bush 12 having the smaller resistance becomes the sliding surface, and the bush 12 and the bearing 10 are separated. Slide. When the frictional resistance of the portion b also increases due to wear, the inner surface side of the bush 12 becomes a sliding surface. At this time, a new portion that has not yet been worn becomes a sliding surface. In other words, the sleeve 12 is gradually rotated by the repetition of the swinging of the roller 3, and a portion different from the first worn portion becomes a sliding surface, and wear starts at this new portion a. If the abrasion progresses also in this portion and the frictional resistance increases, the outer surface of the bush 12 becomes a sliding surface. Also at this time, a new portion that has not yet been worn becomes the sliding surface.
[0017]
As described above, the parts to be worn are both the inner surface and the outer surface of the bush 12, and the places to be worn change, so that long-term operation can be performed without replacing the bush 12.
[0018]
In addition, the sliding surface does not always switch between the inner surface and the outer surface, but there is no fear of uneven wear because a new portion where no wear occurs becomes the sliding surface. That is, when the bush 12 rotates little by little and wear occurs at the portion a, a new portion a in the immediate vicinity becomes a sliding surface.
[0019]
Further, a pin or the like is screwed from the bearing 10 and pressed against the bush 12 so that the bush 12 is fixed so as not to slide with respect to the bearing 10. , The uneven wear can be eliminated.
[0020]
【The invention's effect】
As described above, according to the present invention, the wear portions of the bush are sequentially shifted in the circumferential direction, so that uneven wear does not occur and the life of the bush can be extended. For this reason, the cost of the pulverizing action can be reduced.
[Brief description of the drawings]
1 is a cutaway front view of a main part of one embodiment; FIG. 2 is a right side view of a cut main part of the embodiment; FIG. 3 is an enlarged sectional view of a main part of FIG. 1; FIG. 5 is a schematic diagram of one embodiment of a vertical mill. FIG. 6 is a schematic diagram of another embodiment of a vertical mill. FIG. 7 is an example diagram of a roller swing mechanism of a pulverizing mill. Cross-sectional view of [Description of symbols]
DESCRIPTION OF SYMBOLS 1 Casing 2 Rotary table 3 Crush roller 6 Oscillating block 7 Crush roller spindle 10 Bearing 11 Sleeve 12 Bush

Claims (1)

A roller 3 located above the rotary table 2 in the casing 1 is supported by the casing 1 so as to be vertically swingable, and the roller 3 is urged toward the rotary table 2 by a pressing means 4 to rotate the roller 3. In a vertical mill for pulverizing the crushed material a between the table 2 and the roller 3, the support shaft 7 of the roller 3 is rotatably supported on a bearing 10 of a casing 1 via a bush 12 and a sleeve 11. ,
Fitted with an interference fit of the sleeve 11 to the support shaft 7 rotatably fitted a bush 12 between the sleeve 11 and the bearing 10, and form a bushing 12 of a soft metal from the sleeve 11, the swing of the support shaft 7 A roller supporting structure for the vertical mill, wherein the bush 12 is rotated as the rotation speed increases.

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