JPH0116543Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to the improvement of a distribution panel used in a so-called air classifier, and particularly relates to the structure of the distribution panel that can improve durability and the ability to evenly distribute materials to be classified. be.

First, the structure of a conventional general air classifier will be briefly explained using FIG.

The classifier 20 is composed of a classifier main body 22 having a driving electric motor 21 on the upper part thereof, a plurality of cyclone separators 23 arranged around the main body 22, a circulation fan 24, a duct connecting these, and the like. .

At the lower end of the drive shaft 26, which is rotated by the drive motor 21 attached to the upper part of the classifier main body 22 via the gear reducer 25, there is a disc-shaped distribution plate 2.
7 is mounted horizontally, and selector blades 28 that rotate integrally with the distribution board 27 are provided radially on the top of the distribution board 27 with the drive shaft 26 as the center.

A raw material discharge port 29 opened radially between the distribution board 27 and the selector blade 28 is connected to a raw material supply port 31 opened in the ceiling of the classifier main body 22 via a raw material passage 30 surrounding the drive shaft 26. It communicates with

Tapered funnel plates 33, 34, and 35 are arranged in steps at the lower part of the classification chamber 32 that houses the distribution board 27 and the selector blade 28. In the space between them, there are deflection plates 36, 36, ... and 3 in a spiral direction so that the air flowing into each funnel plate forms a swirling flow.
7, 37, . . . are arranged at equal pitches on the same circumference.

Located at the bottom of the classification chamber 32, the funnel plate 3
The lower surface of the air distribution chamber 39 surrounding 3, 34, and 35 forms a tapered plate 40 (lower cone) parallel to the funnel plate 35, and the lower end 38 of the tapered plate 40
Discharge the coarse powder from.

Further, a plurality of communication ducts 45, 45, . A dust exhaust pipe 46 provided at the center of the upper part of each cyclone separator 23 is connected to a collection duct 48, 48, . The circulation fan 24 and the air distribution chamber 39 are connected to the air extraction port 4.
9 through a bleed chamber 50.

Therefore, the raw material powder input from the raw material supply port 31 is discharged from the raw material discharge port 29 onto the distribution plate 27, and is discharged into the classification chamber 32 by the centrifugal force caused by the rotation of the distribution plate 27. It is distributed all around the classification chamber 32.

Of the raw material powder thus dispersed, the coarse powder falls by gravity, descends against the flow of the circulating air flow indicated by the white arrow, and is discharged from the coarse powder discharge tube 38.

On the other hand, the circulating air flow sent into the air distribution chamber 39 via the air bleed chamber 50 by the circulation fan 24 passes through the deflection plates 36 and 37 as shown by the white arrow, and rotates into the classification chamber. 32 and into the communication duct 45, but along the way, it collects fine powder with a small mass in the raw material powder and rises, and as the selector blade 28 rotates,
Further, more than a certain amount of particles are captured, and only the fine powder reaches the cyclone separator 23 via the communication duct 45, and the fine powder collected here is discharged from the air lock damper at the bottom of the cyclone separator 23.

During the exhaust from the cyclone separator 23,
Although it contains a very small amount of fine powder, a method is generally used in which these fine powders are collected by a dust collector from the air bleed port 49 when passing through the air bleed chamber 50. The material to be classified discharged from the outlet 29 slides on the surface of the distribution board 27 and is discharged in the radial direction. Therefore, only a certain passage on the upper surface of the distribution board 27, through which the material to be classified often passes, is worn out significantly, causing premature wear. There are maintenance issues such as replacement. Therefore, the distribution board 27 is made of a material with high wear resistance in order to extend its life, but when such a material is used, there are problems with the processing performance, welding performance, etc. of the distribution board. Moreover, such changes in material do not have the expected effect on life extension. Also, since such distribution panels are installed in locations where it is very difficult to replace them, it is desirable to have a distribution panel with a long lifespan.

The purpose of this invention is to eliminate the drawbacks inherent in the conventional distribution board for classifiers as described above. In a distribution board for a classifier that separates raw powder into coarse powder and fine powder, raw powder is discharged into an updraft by rotation of the distribution board and classified into coarse powder and fine powder. Provided is a distribution board for a classifier in which the board is divided into three or more equiangular fan-shaped distribution boards, and a large number of parallel ribs are fixed at right angles to one side edge of each fan-shaped distribution board on the upper surface thereof. It is something to do.

Next, embodiments embodying the present invention will be described with reference to the attached drawings starting from FIG. 2 to provide an understanding of the present invention. FIG. 2 is a top plan view of a distribution board according to an embodiment of the present invention, and FIG. 3 is a plan view of a quarter section of the distribution board before assembly.

In FIG. 2, reference numeral 61 indicates the entire distribution board, and a quarter portion 61a thereof is shown in FIG. As shown in FIG. 3, a mounting plate 63a for joining the other quarter parts is welded to a side part 62 of the fan-shaped distribution board 61a, and a mounting plate 63a for joining the other quarter part is welded to the opposite side part 64. Bolt holes 65 for fixing the mounting plate 63a provided in the other quarter part
Many holes have been drilled.

On the upper surface of the distribution board 61 shown in FIG.
are fixedly installed in parallel. This side portion 63 is the side edge of the distribution board 61b. The distribution board 61 is the second
When attached to the classifier shown in the figure, a large number of raw material discharge ports 29 are arranged radially in the center of the classifier, and when the distribution plate 61 rotates in the direction of arrow 67, the raw material discharged from the raw material discharge ports 29 is The powder is discharged in a spiral manner against the distribution plate 61, as shown by the large white arrow 68 in FIG.

The fixing direction of the rib 66 is indicated by the arrow 6 like this.
It is desirable that the direction be as perpendicular to the outflow direction of the raw material as indicated by 8. rib 66
By providing it at a right angle to the side part 63 of the distribution board 61b as described above, it is planted approximately at right angles to the discharge direction of the raw material, and the worn part formed on the top surface of the distribution board 61 is On the other hand, since the ribs 66 are arranged at 90 degrees, the strength of the distribution board 61 will not decrease even if the distribution board 61 is worn out, and the ribs 66 will not only prevent the air from flowing on the distribution board 61 By disturbing the flow and dispersing the raw material powder on the distribution plate 61, the raw material powder is not discharged from the distribution plate 61 only through a certain path, but is dispersed and discharged over a wide range.

In this embodiment, the distribution board 61 is divided into four parts as an example of fan-shaped division, but the distribution board 61 is divided into four parts.
Of course, the present invention also applies to cases where 1 is divided into three or five or more parts.

As described above, the present invention uses a distribution plate for a classifier that discharges raw material powder into an updraft by rotating the distribution plate and classifies it into coarse powder and fine powder. In a distribution board for a classifier that discharges into an updraft to classify coarse powder and fine powder, the distribution board is divided into three or more equiangular fan-shaped distribution boards, and one side of each fan-shaped distribution board is placed on the top surface of each fan-shaped distribution board. This distribution board for a classifier is characterized by a large number of parallel ribs fixed at right angles to the edge, so by adding the ribs, the life of the distribution board can be extended without using expensive wear-resistant materials. Since it can be extended, it is possible to reduce costs in terms of material costs, and since it is easy to process, it can also contribute to reducing manufacturing costs.
It is possible to arrange the ribs so that the direction is perpendicular to the flow of the material to be sorted, and by arranging the ribs in this direction, even if the surface of the distribution board becomes considerably worn, the distribution It can be used for a long period of time without reducing the strength of the panel, and can be expected to significantly reduce costs by reducing the number of times the distribution panel must be replaced. In addition, by making the direction of the ribs approximately perpendicular to the flow of the material to be classified as described above, the ribs disturb the airflow on the distribution board, and by dispersing the material to be classified on the distribution board, it is possible to spread the material over a wide range. The material to be classified can be diffused and released, the material to be classified can be evenly distributed, contributing to improving the classification efficiency of the classifier, and preventing uneven wear of the distribution disk.

[Brief explanation of the drawing]

Figure 1 is a side sectional view of a conventional general classifier, Figure 2 is a top view of a distribution board that is an embodiment of the present invention, and Figure 3 is the state of the distribution board before it is assembled. FIG. Explanation of symbols, 61...Distribution board, 61a, 61b
... Fan-shaped component of the distribution board, 66 ... Rib, 68
...Arrow.

Claims (1)

[Scope of utility model registration request] In a distribution board for a classifier that discharges raw material powder into an updraft by rotating the distribution board and classifies it into coarse powder and fine powder, the distribution board is divided into three or more equiangular fan-shaped distribution boards, and each A distribution board for a classifier, characterized in that a large number of parallel ribs are fixed at right angles to one edge of the upper surface of the fan-shaped distribution board.