JPH0290954A - Classifier of vertical mill - Google Patents

Abstract

PURPOSE:To ensure that the meshes of a classifier is not blocked by grinding coarse powder between a rotary ring attached to a table and a stationary ring fixed to a casing, and allowing the ground powder to drop through a clearance between the rings or returning the powder to the table using a scraper. CONSTITUTION:At least one ring 10 is concentrically installed to the same core on the outer periphery of a table 6 by a supporting arm 11 fixed to the table 6. Then rings 10' between the table 6 and the inner ring 10, and between the rings 10 are concentrically installed to the same core with the table 6 by a supporting arm 11' fixed to the casing 7 of a vertical mill. In addition, the rotary ring 10 fixed to the table 6 and the stationary ring 10' fixed to the casing 7 are alternately adjacent to each other. Further, at least one scraper 12 with its end fixed to the casing 7 is arranged on the ring in such a manner that the scraper is inclined in a rotating direction rather than in a radial direction. Consequently, the meshes of a classifier are not blocked and smooth grain classification is ensured.

Description

[Detailed Description of the Invention] [Industry-42 Field of Application] The present invention is applicable to classification of clinker, which is a raw material for cement, coal used in boilers, blast furnaces, and various industrial furnaces, or powders such as wheat and corn. The present invention relates to a classification device for a vertical mill.

[Prior Art] First, referring to FIG. 9, a vertical mill and a conventional classification device will be briefly described.

The raw material to be crushed is fed from the center of the top 2 of the mill 1 through a vibrator 3.

A circular table 4 is placed directly below the pipe 3. Since the table 4 has a medium-height slope, when the table 4 is rotated by a motor via the reducer 5,
The raw material is guided toward the outer circumference by the centrifugal force and the above gradient.

On the outer periphery of the table 4, there is a table segment 1-6 concentrically with the table 4, forming a concave ring-shaped crushing part.

The raw material is from the segment!・Flows into 6.

A plurality of large-diameter tire-shaped special steel rollers 8, which are pivoted obliquely to the casing 7, are placed on the segment 6 so as to be inclined inward from a right angle to the surface of the table 4.

The roller 8 is rotated by the frictional force with the table 4 as the table 4 rotates, and the raw material is crushed and finely divided by the shearing force between the roller 8 and the table segment 6.

The pulverized raw material is gradually pushed out toward the outer circumference by the centrifugal force caused by the rotation of the table 4.

On the outer periphery of the table segment 6, there is a fixed sieve 9 or slit 9' between the segment 6 and the casing 7, and particles finer than the sieve 9 or slit 9' gap fall through the gap and are milled. It is sent out by an air current such as air delivered to the lower part of the air pump 1.

[Problems to be Solved by the Invention] However, in the case of the fixed sieve 9 and the slits 9°, particles larger than the gap do not fall down, so they gradually stagnate and accumulate on the sieve 9 or the slits 9°, The drawback was that it eventually became clogged, reducing its classification ability. In order to prevent clogging, it is necessary to widen the gap between the holes to allow even medium-sized powder to fall, which makes it difficult to classify fine particles.

The present invention aims to solve these drawbacks and prevent clogging of the classification device.

[Means for Solving the Problems] The present invention provides a vertical mill having a crushing section consisting of a rotating circular table and a plurality of rollers rotating in contact with the table. Both rings are mounted concentrically by a support arm fixed to the table, and a ring is fixed to the table between the table and the inner ring and between each ring by a support arm fixed to the casing of the vertical mill. At least one scraper with one end fixed to the casing is tilted in the direction of rotation with respect to the radius of the ring, and a rotary ring fixed to the table and a fixed ring fixed to the casing are arranged adjacent to each other alternately, and one end of the scraper is fixed to the casing. The classification device of a vertical mill is characterized by being arranged on a ring, and furthermore, each classification ring has a step,
This applies to the classification equipment of vertical mills, where the ring is tapered to have a trapezoidal cross section, a 117 arc-shaped cutter is provided instead of a fixed ring, each ring is stepped, and the scraper is also sloped. It is something.

[Function] A relative rotational movement occurs between the rotatable ring fixed to the table and the fixed ring fixed to the casing, and the shearing force causes the coarse powder that remains on the ring to be crushed and fall through the gap between the rings. Since the dust is returned to the table again by the scraper, the tit powder will not accumulate on the ink and cause clogging, and the classification capacity will always be maintained at 100%.11
It will be decoded.

By adding a step to the ring so that it is higher on the outside, the coarse powder can be quickly adjusted to the table.

When the cross section of the ring is trapezoidal, the gap between the rings can be arbitrarily changed by changing the height of the rotating ring or the stationary ring, so the particle size that can be classified can be changed.

Even if an arcuate section is provided between the rings fixed to the table and the section is fixed to the casing by a support arm, the crushing effect and clogging effect due to the relative rotational movement of the rings can be obtained.

If each ring is provided with a step and the scraper is also sloped parallel to the ring, the coarse powder will hardly ever advance onto the ring, and even if it does, it will be immediately returned to the table and only the fine powder will be removed from the ring. Fall through the gap.

[Implementation example] Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the present invention, and FIGS.
Parts with the same reference numerals as those in the figures represent the same parts.

Further on the outer periphery of the segment 6 of the table 4, between the segment θ and the casing 7, a plurality of perfectly circular rings 10 are arranged concentrically with the table 4 and spaced apart from each other at regular intervals. The ring 10 is attached so as to be supported from below by an appropriate number of support arms 11 fixed to the ring.

Between table 4 and inner ring IO and each ring IO
A ring 10 is further arranged in the gap between the ring 10 and the ring 10, and each ring 10' is attached to be supported from one side by an appropriate number of support arms 11' fixed to the casing 7.

Therefore, the rotating side ring 10 fixed to the circular table 4
and the fixed side ring 10' fixed to the casing 7 are alternately arranged with the required gap 1, that is, the classification gap d.

One end of an elongated scraper 12 is fixed to the casing 7 near the upstream side of each of the support arms It', and the other end is provided with the other end slightly inclined in the rotational direction from the radial direction with respect to the ring 10.10°.

The gap between each scraper I2 and each ring 10.10° is preferably less than the classification gap d.

The operation will be explained below.

Raw materials are introduced and supplied through the vibrator 3 located at the center of the top 2 of the mill 1.

The raw material t4 passes through the pipe 3 and falls onto a circular table 4'' located directly below the pipe 3, but since the table 4 has a slope, as the table 4 rotates, the raw material moves around the outer periphery due to the slope and centrifugal force. direction and fall into the table segment 6.

In the first segment G, the raw material is pulverized by the shearing force between the segment 6 and three large-diameter tire-shaped special steel rollers 8 placed on the segment 6.

The raw material powder pulverized on segment 6 is pushed out in the outer circumferential direction by centrifugal force, and the outer circumferential ring 10.10°.
Reach the second. On ring 10.10', ring 10
．． Particles smaller than the 10' gap fall to the bottom, while larger particles remain on top.

Ring 10, 10° is several supports! ! Arm +1,11
The rings 10 fixed to the table 4 rotate with the rotation of the table 4, and the rings 10' fixed to the casing gate remain stationary. There is.

A relative rotational movement occurs between the rotating ring 10 and the fixed ring 10゛, and due to the shearing force between the two rings 10 and 10°, the powder remaining on the ring can fall more than the ring 10.10° interval. The particles are crushed, atomized, and dropped, or are moved from above the ring [, 1 (l) by the movement of the rotating ring 10 and returned to the table 4 again.

Furthermore, ring 10. Since several scrapers 12 are provided in the ring 2, the coarse powder remaining in the ring 2 is returned to the table 4, where it is ground again.

Since the scraper I2 is installed slightly more obliquely in the rotational direction than in the radial direction, the coarse powder scraped by the scraper 12 does not stagnate and smoothly returns to the table.

FIG. 3 shows a second embodiment of the present invention, in which a plurality of rings 10 and 10' are provided with steps so that the outer sides thereof are successively higher, in a configuration substantially similar to that of the previous embodiment. be.

Coarse powder that does not fall through the gap between the rings 4 due to the above-mentioned step easily returns to the table 4, thereby preventing clogging.

FIG. 4 shows a third embodiment of the present invention, in which the ring 10.10'' has a configuration substantially similar to that of the first embodiment, but the inner and outer peripheral surfaces of the ring 10.10'' are sloped, and the cross section is trapezoidal. This is an example in which the rotating ring 10 and the fixed ring 10' are upside down.

By changing the height of the rotating ring 10 or the fixed ring lO°, the size of the mutually parallel gaps can be changed and the particle size to be classified can be controlled.

FIGS. 5 and 6 show a fourth embodiment of the present invention, in which a fixed link ν10
An arc-shaped ring section 13 is used instead of the support arm 11.
' is fixed as an example.

Relative movement occurs between the ring segment 13 and the rotating ring 10, and coarse powder that does not fall through the gap between the rings is crushed or returned to the table 4, thereby preventing clogging.

Furthermore, the remaining coarse powder is quickly returned to the table 4 by the scraper 12.

FIG. 7 and FIG. 8 show a fifth embodiment of the present invention, in which a rotating ring 10 is constructed in substantially the same configuration as the fourth embodiment.
This is an example in which a step is provided in the ring section 15 to make the outer side higher, and the scraper 12 is also provided with a slope so as to be parallel to the ring 10.

Coarse powder rarely advances to ring 10, and even if it does, it quickly returns to table 4 and transfers only fine powder to ring IO.
falling through the gap.

Since the coarse powder does not advance above the 5 ring 10, there is no clogging.
Even if it reaches the ring, it is immediately scraped off by a scraper.

The classification device for a vertical mill of the present invention is not limited to the above-mentioned embodiments, and may be used as a fixed ring support arm or a scraper, or may be provided with a separate scraper, etc., within the scope of the invention. Of course, various changes can be made therein.

[Effects of the Invention] As explained above, the vertical mill classification device of the present invention can provide various excellent effects as described below.

A rotating ring concentric with the fixed table and a fixed ring fixed to the casing are provided on the table by the support arm, and the souffle bar is placed on the ring, so that the rotating ring and the fixed ring cause relative rotational movement, which is different from the conventional ring. It crushes the coarse powder that has accumulated on top and caused clogging,
By returning it to the table, clogging is prevented and classification is performed smoothly.

In addition, since the coarse powder remaining on the conventional ring is returned to the table by the school and pulverized again, there is no possibility of large particles remaining on the ring that may cause clogging. Therefore, the classification efficiency is improved.

By adding steps to the ring, the coarse powder remaining on the ring is naturally returned to the table and re-ground without remaining or accumulating.

With a ring that has a trapezoidal ring cross section, by changing the height of the rotating ring or stationary ring, it is possible to widen or narrow the parallel surfaces to classify various particle sizes. .

When setting a step on the ring and tilting the scraper,
It becomes easier to remove coarse powder that remains on the ring.

Since the coarse powder is crushed on the ring or returned to the table, there is no need for a special device to collect the coarse powder and return it to the crushing section, which simplifies the structure.

[Brief explanation of the drawing]

FIG. 1 is a plan view of one embodiment of the present invention, FIG. 2 is a view taken in the direction of arrows -■ in FIG. 1, FIG. 3 is a side sectional view of the second embodiment of the present invention, and FIG. 4 is a side sectional view of the third embodiment of the present invention, FIG. 5 is a plan view of the fourth embodiment of the present invention, FIG. 6 is a view taken along the VT-V1 direction in FIG. 5, and FIG. FIG. 8 is a plan view of the fifth embodiment, FIG. 8 is a view taken along the arrows 1--2 in FIG. 7, and FIG. 9 is a diagram showing a conventional example. 4 is a table, 7 is a casing, 8 is a roller, 10 is a rotating ring, lOo is a fixed ring, 11 and 11° are support arms, 12 is a scraper, and 13 is a ring section.

Claims (1)

[Claims] 1) In a vertical mill having a crushing section consisting of a rotating circular table and a plurality of rollers rotating in contact with the table, at least one ring is attached to the outer periphery of the table,
The ring is attached concentrically to the table by a support arm fixed to the table, and the ring is attached concentrically to the table by a support arm fixed to the casing of the vertical mill, between the table and the inner ring and between each ring. A rotating ring fixed to the ring and a fixed ring fixed to the casing are arranged adjacent to each other alternately, and at least one scraper having one end fixed to the casing is arranged on the ring at an angle in the direction of rotation than the radius of the ring. A vertical mill classification device characterized by: 2) The classification device for a vertical mill according to claim 1, wherein a step is provided so that the outer side of each ring is successively higher. 3) The classification device for a vertical mill according to claim 1, wherein the rings have a trapezoidal cross section, and the opposing surfaces of the adjacent rotating ring and stationary ring are parallel to each other. 4) In a vertical mill having a crushing section consisting of a rotating circular table and a plurality of rollers rotating in contact with the table, at least one ring is attached to the outer periphery of the table by a support arm fixed to the table. Install concentrically,
A vertical mill characterized in that arc-shaped ring sections are provided between the rings fixed to the table and between the table and the inner ring, and each section is fixed to the casing by a support arm. Classifying device. 5) The classification device for a vertical mill according to claim 4, wherein a step is provided so that the outer side of each ring and each section is sequentially higher, and the support arm of each section is also inclined parallel to the ring so that the outer side is sequentially higher.