JPS59173170A - Air classifier - 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 The present invention relates to an air classifier used in a crushing process in a cement plant or the like.

Generally, in the crushing process of cement plant, etc., raw material A is supplied to the crusher 1 as shown in the figure t=1, and after being crushed, it is sent to the air classifier 2 as an incoming powder, and the rotating refined powder B is separated. , this is sent to the milling room 3 to obtain a product. The air discharged from this fine powder chamber 3 contains a considerable amount of fine powder B, so
The pack filter 4 rotates and adds it to the product.

On the other hand, the coarse powder C in the powder input is sent to the crusher 1 as a return powder and is crushed again together with the raw material A.

Conventionally, this type of air classifier has an air chamber with an air inlet at the bottom of the classification chamber, and a fine powder chamber is communicated with the top of the classification chamber.
A dispersion plate for dispersing incoming powder and a classification blade for classification are rotatably provided in the central part of the classification chamber.

The incoming powder fed into the rotating dispersion plate is dispersed into the classification chamber by centrifugal force, and is separated into fine powder and returned powder by the classification air rising in the classification chamber and the rotating dispersion blade, and the fine powder is returned to the fine powder chamber. On the other hand, the returned powder falls while rotating inside the classification chamber P, and is separated again near the air inlet. By the way, since the returned powder forms a layer and falls down the inner surface of the classification chamber casing, the amount of fine powder separated from the returned powder is small. Therefore, most of the refined powder in the returned powder is sent to the grinder as returned powder.

Incidentally, in this classifier, approximately 30% of the rotating refined powder is returned to the pulverizer as returned powder.

In view of the above points, it is an object of the present invention to recover a large amount of refined powder in returned powder, greatly improve the performance of an air classifier, and reduce power consumption in the crushing process.◇ This invention has an air chamber with an air inlet at the bottom of the classifier,
A fine powder chamber is connected to the upper part of the classification chamber, and a dispersion plate for dispersing the incoming powder and a classification blade for classification are rotatably provided in the center of the classification chamber, and a part of the inner surface of the classification chamber below the dispersion plate is provided. This air classifier is characterized in that a dispersion vane for dispersing the returned powder is provided, and an air blowing slit is formed at the edge of the dispersion vane.

Embodiments of the present invention will be described below with reference to the drawings. In Figure 2, 5 is an air classifier main body, a classification chamber 6 is formed in the upper part of the main body 5, an air chamber 7 is formed in the lower part of the classification chamber, Further, a fine powder passage 9 communicating with the fine powder chamber 8 is provided in the upper part of the classification chamber. An air inlet 10 is formed in the air chamber 7, and a guide vane 11 is provided above the air chamber 7. A dispersion plate 12 for dispersing incoming powder is rotatably provided in the center of the classification chamber, and a classification blade 13t for classification is fixed to the dispersion plate box.

The lower part of the casing 6a of the classification chamber 60 is formed into an inverted conical shape, and a dispersion vane 14 for dispersing the returned powder is provided on the inner surface of the casing 6 and the lower part, and an air blowing slit 15 is formed at the edge of the dispersion vane 14. .

The dispersion vanes 14 are disposed at regular intervals in the circumferential direction as shown in Figure 3, and the swirling flow that swirls in the direction of the arrow (rotation direction of the classification vanes) within the classification chamber is dispersed. It is sloped so that it collides with the vane 14 and flows obliquely upward.

The slit 15 is formed at the upper edge and side edge of the dispersion vane 14, and the slit 15 is formed at the upper edge and the side edge of the dispersion vane 14, and the slit 15 is formed at the upper edge and the side edge of the dispersion vane 14.
The compressed air is blown out obliquely upward and toward the center of the classification chamber (for example, in the horizontal direction). The incoming powder is dispersed into the classification chamber by centrifugal force.

On the other hand, in the classification chamber 6, the classification blade 13 is rotating, and the classified air enters the air chamber 7 from the air inlet [1] 0, is guided by the guide blade 11, and rotates in the direction of arrow a, then moves to L#7. The generated powder scattered in the classification chamber marked with O is separated into light fine powder and heavy returned powder by the classification blade J3 and the classification air.

This fine powder rides on the classified air and passes through the fine powder passage 9 into the fine powder room 8.
On the other hand, the returned powder is rotated around the inside of the classification chamber.
As shown in Fig. 4, arrow 1:lJd
, it slides down in the direction of , collides with the dispersion vane 14, and is crushed.

This broken back powder (B+C) flies out from the edge of the dispersion vane 14 in the circumferential direction (arrow (11L direction)) in the classification chamber in a swirling flow in the same direction as the rotation direction of the classification blade.
At this time, the returned powder < B + C) is removed from the air blowing slit 1.
5, compressed air is blown out diagonally upward (arrow e+) and toward the center of the classification chamber (for example horizontally) (arrow e yo direction).
It is perpendicular to , and is diffused into the classification chamber 6 and washed again by the classification air (direction of arrow f) to separate fine powder B in the returned powder.

This fine powder B rides on the classified air (in the direction of arrow f) to the fine powder chamber 8.
On the other hand, the returned powder C is returned to the pulverizer and pulverized again.

In the present invention, a dispersion vane is provided on the inside of the classification chamber below the dispersion plate, and an air blowing slit is formed at the edge of the several dispersion tube. The powder can be crushed and dispersed, and further, the dispersed returned powder can be spread perpendicularly to the compressed air blown out from the air blowing slit. Therefore, the returned powder can be washed well by the classified night air, so a large amount of fine powder in the returned powder can be recovered, and the classification function of the air classifier can be greatly improved.
The amount of recycled powder is reduced, and the power consumption in the crushing process can be reduced.

[Brief explanation of drawings]

Figure 71 is a cement-Pvro Y1 chart using a conventional air classifier, Figure 2 is a longitudinal sectional view showing an embodiment of the present invention, Figures 1 and 3 are the m-m line of Figure 2. The cross-sectional view and the 4th cross section are diagrams showing the separated state of the returned powder in an embodiment of the present invention. 6...Classifying chamber 7...Air chamber 8-...Powder chamber 10...Air inlet 12...Dispersion plate 13-...Classifying blade 14...Dispersion vane 15...Air blowing slit Representative masu filler Saifuji Yugai 2 people @ 1 Figure 3w1 1st 112 Figure 7 6 14 Figure 14 ′:゛, 11 -〇

Claims (1)

[Claims] An air chamber with an air inlet is provided in the lower part of the classification chamber, and a fine powder chamber is communicated with the upper part of the classification chamber, and a dispersion plate for dispersing incoming powder and a classification blade for classification are rotatably provided in the center of the classification chamber. An air classifier characterized in that a dispersion vane for dispersing returned powder is provided on the inner surface of the classification chamber below the dispersion plate, and an air blowing slit is formed at an edge of the dispersion vane.