JPS5951355B2 - Classifier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a classifying device for sorting powder particles into a desired particle size range by applying centrifugal force and centripetal force simultaneously to the particles in an air flow.

Conventionally, there are various types of classification devices of this type, but in general, the material to be sorted (hereinafter simply referred to as material) is introduced into the classifier along with an airflow, and centrifugal force is applied by a classification impeller rotating inside the classifier. The material in the airflow is separated and sorted by the difference between the centrifugal force and the centripetal force, which are applied at the same time. There are things to do. In this type of classifier, it is desirable that the material be well dispersed. However, in the conventional method, this dispersion effect was not sufficient, and there was a risk that some of the aggregated fine powder particles in the material would not be dispersed into single particles and would be sent to the coarse powder region. As a result, there is a problem that fine powder is mixed into coarse powder, which is manifested in a decrease in the recovery rate and classification efficiency of fine powder. Therefore, the present invention effectively promotes the dispersion of material particles and efficiently performs the classification action in the next step.
The purpose is to improve the fine powder recovery rate and classification efficiency. Next, the configuration of the present invention will be explained using examples. 1 is the main body of the classifier, and the rotating shaft 3 is located in the upper part of the body of the machine.
a classification impeller 2 whose rotating outer peripheral surface forms an inverted conical shape and is rotatably supported by a classification impeller 2; An inlet 1 having a slit-like opening toward the lower side in the rotational direction.
5 is disposed, an air chamber 8 is formed between it and the body inner wall surface 14 of the classifier main body 1, and a secondary gas inlet 9 is disposed in communication with the air chamber 8. ing.

In this embodiment, the air chamber 8 is partitioned by a partition wall 11 into air chambers Ba and 8b, each of which is provided with a secondary air inlet and a body inlet 9a and 9b, but this is particularly limited to two chambers. isn't it. In contrast to the above structure of the upper part of the inside of the machine body, the lower part includes a blowing pipe 4 for introducing the material along with the airflow, and a coarse powder outlet 6 for taking out the sorted coarse powder side particles to the outside of the machine.
A tertiary gas inlet 10 for introducing gas for the purpose of wind sieving the material transferred to the coarse powder side and a wind sieve ring 13 which is disposed continuously with the guide vanes 7 and forms a wind sieve part are provided. It is being Reference numeral 12 denotes an opening of the blowing pipe 4. The opening 12 is concentrically opposed to the classification impeller 2, and its position is determined according to the distance from the classification impeller 2 and the wind sieve ring 1.
3 is configured to allow adjustment of the distance from the lower end.

In this embodiment, the above-mentioned interval is configured to be adjustable by an adjustment cylinder 16 that fits into the blow pipe 4; however, the adjustment cylinder 16
Adjustment from outside the machine can be made by movably fitting into the blow tube 4. Also, wind sieve ring 13
It is also possible to make it a removable type with an appropriate inner diameter. Furthermore, in this embodiment, the classification impeller 2 is structured so that its outer peripheral surface forms an inverted conical shape when rotating, and accordingly, the ventilation member 7 also has a shape that follows the classification impeller 2. The present invention can be practiced even if the impeller 2 has a different shape or the ventilation member 7 is provided in a cylindrical shape. Further, the secondary gas inlets 9a, 9b and the tertiary gas inlet 10 are opened in accordance with the rotating direction of the classification impeller 2 and in a tangential direction to the body of the classifier main body 1, and are opened as ventilation members. 7 and the air sieve ring 13 to make the flow uniform and stable, but the opening direction is not particularly limited. In this embodiment, the ventilation member 7 is a flat blade-like member that maintains a constant gap, is inclined toward the lower side in the rotational direction of the classification impeller 2, and is arranged so that adjacent ends thereof overlap. However, it is also possible to use a blade-like member formed into a curved surface along a streamline, or a punch plate with holes tilted in the rotation direction of the classification impeller 2. It is. The point is that the openings of the small holes are relatively uniform along the inner peripheral surface of the ventilation member 7 at an angle toward the downstream side in the rotational direction of the classification impeller 2, or in a direction close to the inner peripheral surface line of the ventilation member 7. It is sufficient if they are distributed and arranged. The fine powder discharge port 5 is connected to a Cytalon collector, a pack pool, etc. (not shown). It is communicated with a windmill (not shown) via a collector such as a turbine. In the above configuration, the material is transported from the blowing pipe 4 into the classifier main body 1 along with the airflow due to the rotation of the transporting airflow and the classification impeller 2 (the direction is shown by the arrow in the figure). It is dispersed and made into single particles under the agitation effect of the swirling airflow associated with it, and is simultaneously subjected to the centrifugal force F caused by the rotation of the classification impeller 2 and the centripetal force K due to the airflow j directed toward the center of the classification impeller 2. By adjusting the rotational speed of the classification impeller 2 and the speed of the airflow toward the center of the classification impeller 2 to predetermined values, a desired sorting effect is imparted to the material particles, and the sorting effect is applied to the material particles. Therefore, the fine particles for which the centripetal force K is larger are sucked into the center of the classification impeller 2 along with the air flow J, and after being carried out of the machine from the fine powder outlet 5, they are separated from the gas and collected by the collector. be done.

On the other hand, coarse particles with a large centrifugal force F move to the outer circumference of the rotation and reach the inner circumferential wall formed by the ventilation member 7. Here, by providing the ventilation member 7, which is a requirement of the present invention, the material transported by the transport airflow is transferred from the secondary gas inlets 9a and 9b in addition to the transport airflow and the swirling airflow caused by the rotation of the classification impeller 2. The dispersion effect of the inflow air 1 blown along the inner circumferential surface of the ventilation member 7 from the inflow port 15 provided in the ventilation member 7 is greatly enhanced, and after being rapidly dispersed, the classification is performed again. It is transported to the outer circumference of the impeller 2 and sorted. In other words, the inflow airflow 1 passing through the inflow port 15 has an extremely high velocity and is uniformly blown from all around the circumference, so that it appears to form a gas film flowing at high speed, unlike the conventional conveying airflow. When the airflow merges with the swirling airflow caused by the rotation of the classification impeller 2, a significant agitation effect occurs, so that the material in the airflow is extremely efficiently dispersed and made into single particles. After being subjected to such repeated sorting actions, the material still in the coarse powder region descends along the inner wall surface of the ventilation member 7, but as it passes through the air sieve ring 13, it is introduced from the tertiary gas inlet 10. The fine powder particles that are still adhered to or intermixed with the coarse particles are separated by the wind sieving caused by the rising air current e and the accompanying dispersion and sorting effects, and are transported by the conveying air flow and subjected to the sorting effect again. Coarse particles pass through the classification impeller 2, pass through the wind sieve ring 13, fall, and are discharged and collected from the coarse powder outlet 6 to the outside of the machine. The material thus supplied to the classifier according to this example is
By repeatedly applying the dispersing action and the sorting action, many opportunities for classification are given to one particle, and the classification performance is improved. As described above, according to the present invention, the degree of fine powder particles adhering to the coarse powder side particles, descending in the machine body in an agglomerated state, or being mixed into the coarse powder is extremely reduced, so that fine powder can be recovered. In addition, when recovering coarse powder as a product, high quality can be obtained, and the classification ability can be further improved through effective dispersion and efficient classification. The present invention is extremely useful industrially.

[Brief explanation of the drawing]

1 is a sectional view of a main part showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3 is an enlarged view of a portion B in FIG. 2. In the figure, 1... the main body of the classifier, 2...
...Classifying impeller, 4...Blowing pipe, 5...
... Fine powder discharge port, 6 ... Coarse powder discharge port, 7 ・
...Ventilation member, 8 ...Air chamber, 9 ...
...Secondary gas inlet, 14...Inner wall surface, 1
5...Inflow port.

Claims (1)

[Claims] 1. A blowing pipe 4 that carries in the material to be sorted on an air current;
a classifier main body 1 having a fine powder outlet 5 and a coarse outlet 6;
It consists of a classification impeller 2 provided in the classifier main body 1, the classification impeller 2 is rotated, the sorted differential particles are sucked into the meat side of the classification impeller 2, and the fine powder is discharged from the fine powder outlet 5. In a classifier configured to discharge the coarse powder particles from the coarse powder discharge ports 6, the classifier body 1 surrounds a classification impeller 2, and is spaced from the classification impeller 2 at an appropriate distance. ,
A ventilation member 7 having a large number of inlets 15 opened toward the downstream side in the rotational direction of the classification impeller 2 is disposed, and the ventilation member 7 allows the air flow between the inner wall surface 14 of the classifier main body 1 and A classification device characterized in that an air chamber 8 is formed in the air chamber 8, and a secondary gas inlet 9 is provided in communication with the air chamber 8.