JP2007117825A - Classifier - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a classifier which can resolve a conventional problem of the classifier that an aggregate is classified while it is not fully crushed. <P>SOLUTION: The classifier can control the rotational speed of a dispersing plate and a classification vane, respectively by making a driving machine the dispersing plate and the a classification vane independent, and for example, when a raw material containing much aggregate is classified, only the rotational number of the dispersing plate can be changed while the rotational number of the classification vane is kept constant. Therefore, as the crushing degree of the aggregate can be changed almost without changing the degree of classification (the average particle diameter of a fragment taken out), the efficiency of classification becomes good. Further, in the classifier, a raw-material throwing-in chute is made to pass in an inner cylinder for making the classification vane rotate to be used as a rotational axis and also given a raw-material supplying function. Thus, the classifier is simple in apparatus structure to allow to reduce the apparatus size although the driving machine of the dispersing plate and the classification vane are made to be independent. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The classifying apparatus of the present invention relates to a classifying apparatus that efficiently separates granular materials such as coal, limestone, cement raw material, slag, cement clinker, ceramics, filler, and chemicals into granular materials of a predetermined particle size.

  The classifier is intended to sort and separate powder particles into particles of a required particle size. For example, a cyclone separation method is generally used as a dry classifier for classifying powder particles pulverized by a pulverizer as a raw material, and the particles are larger than the classification point of the classifier. It is separated into a granular material having a particle size (coarse powder) and a granular material having a smaller particle size (fine powder). The classification point of the classifier can be changed variously depending on the type, structure, operating conditions, etc. of the classifier.

  There are many types of the classifiers described above. For example, classifiers having structures as disclosed in Patent Document 1, Patent Document 2, and Patent Document 3 are known.

JP 63-39666 A Japanese Patent Application Laid-Open No. 11-267592 JP 2001-38296 A

In the classification device disclosed in Patent Document 1 (sometimes referred to as a separator), classification gas (air or the like) is introduced from the lower side of the device, and the introduced gas becomes an air flow that rises inside the device, and is guided. It passes through the member and the classification blade (classification impeller) and is led out of the apparatus.
The airflow rises while rotating so as to wind a vortex due to the effect of the rotating classification blades and the like when rising in the apparatus.

Here, the granular material (hereinafter also referred to as a raw material) supplied from the raw material inlet onto the dispersion plate jumps out of the dispersion plate by the rotation of the dispersion plate, and flows into the rising airflow flowing around the dispersion plate. It is carried on board.
Of the raw materials jumping out of the dispersion plate, the raw material having a large diameter is heavy and does not get on the ascending current but falls downward and is taken out from below the apparatus.

In addition, since the raw material once started to rise in the ascending current is also affected by the rotation of the air current and rises while rotating, the raw material having a relatively large particle diameter is generated by the rotation of the raw material. The force deviates from the flow of the air current, falls downward, and is taken out of the apparatus.
According to the principle described above, the classifying device disclosed in Patent Document 1 allows a raw material having a large diameter to fall below the apparatus, and a raw material having a small diameter and a small weight can be selectively taken out from above the apparatus. The raw material having a small diameter can be separated and classified.

In addition, the classification devices disclosed in Patent Document 2 and Patent Document 3 use the above-described classification mechanism in part, and in particular, the granular material has a particle size configuration of several stages of coarse powder, medium powder, and fine powder. The present invention relates to a classification device that can classify efficiently.

By the way, in the conventional classification device as described above, it is common to change the rotation speed of the classification blade in order to change the degree of classification, and by increasing the rotation speed of the classification blade, classification is performed. A strong swirling flow is generated in the apparatus, and the raw material having a large diameter deviates from the air flow of the classification gas and falls downward, so that the raw material having a smaller diameter can be taken out from the upper part.

Here, looking at the structure of the classification device disclosed in Patent Document 1, the dispersion plate and the classification blade are driven by a single drive shaft, and the rotation speeds of the dispersion plate and the classification blade are the same. This is due to the positional relationship between the dispersion plate and the classification blades. To drive the dispersion plate below the device from the classification blades, it is simpler and more compact to use a single drive shaft. According to the technical idea of being. An example of the conventional example is shown in FIG.

However, in recent years, more efficient classification has been demanded, and a classification apparatus with higher classification accuracy has been demanded.
However, when the above-described conventional classification device that rotates the dispersion plate and the classification blade with one drive shaft is used, the aggregate is supplied into the classification gas without being sufficiently crushed in the classification device, As a result, problems such as poor classification accuracy occurred.

  Moreover, in the classifiers as shown in Patent Documents 1 to 3 and FIG. 2, there is a problem that the raw material tends to be biased when it is put into the dispersion plate, and it is difficult to supply it uniformly near the center of the dispersion plate. If the raw material cannot be evenly supplied near the center of the dispersion plate, the dispersion of the raw material popping out from the dispersion plate may not be uniform and may be biased. If the dispersion of the raw material is biased, there is a problem that accurate classification cannot be performed. To do.

  The present invention relates to the above-described conventional problems, and an object of the present invention is to provide a classifier having high classification and dispersion effects by solving this problem.

In order to achieve the above object, the classifying device according to the present invention comprises:
(1) The lower end of the raw material input chute, which is provided with a raw material input port and a classification gas discharge port at the upper part of the device, and has a coarse powder outlet and a classification gas inlet at the lower part of the device, and extends vertically downward from the raw material input port. A disc-shaped dispersion plate is fixedly disposed between the introduction port and the discharge port of the classification gas, and a classification blade is disposed between the dispersion plate and the discharge port of the classification gas, and the classification is performed. By blowing up the gas from the inlet to the outlet through a classification blade, the raw material supplied and dispersed on the dispersion plate is separated into coarse powder and fine powder, and the fine powder is placed on the upper part of the apparatus. A classification device that takes out the classified gas from the arranged classification gas discharge port together with the classified gas and also takes out the coarse component from the coarse powder outlet provided in the lower part of the apparatus, and the inner cylinder in which the classification blades are connected via a connecting member is a casing. The material input chute is inserted into the inner cylinder. In addition, the outer peripheral portion of the raw material charging chute is rotatably supported on the inner peripheral portion of the inner cylinder, the upper end and the lower end of the raw material charging chute are protruded from the inner cylinder, and the protruding portion on the upper end side is While being connected to one rotation driving machine, an opening was provided in the projecting part on the lower end side, and the vicinity of the upper end part of the inner cylinder was connected to the second rotation driving machine.

(2) In the classification apparatus according to (1), the openings are provided at equal intervals in the circumferential direction of the lower end portion of the raw material charging chute.

According to the present invention, the rotational speeds of the dispersion plate and the classification blade can be individually controlled by separately providing the driving devices for the dispersion plate and the classification blade.
Therefore, when classifying a raw material having a large amount of aggregates, it is possible to change only the rotational speed of the dispersion plate while keeping the rotational speed of the classification blade constant.
If the rotation speed of the dispersion plate can be increased while keeping the rotation speed of the classification blade constant, the raw material jumping speed that jumps out of the dispersion plate is hardly changed, with almost no change in the degree of classification (average particle size of the extracted subdivision). The raw material jumping out of the dispersion plate vigorously collides with the side wall of the casing on the side surface of the dispersion plate and agglomerates are crushed, so that the classification efficiency is improved.

In the present invention, the inner cylinder for rotating the classification blade is used as a rotating shaft of the dispersion plate through the raw material charging chute and has a raw material supply function. Therefore, the apparatus configuration is simple and can be miniaturized despite the classifying apparatus in which the dispersing plate and the classifying blade drive are separately provided.

  Furthermore, when supplying the raw material to the dispersion plate, it is important to supply the raw material as uniformly as possible near the center of the dispersion plate. Will be better. According to the present invention, if the opening formed at the lower end of the raw material charging chute is provided at equal intervals in the circumferential direction, the raw material is uniformly supplied from the opening formed at the lower end of the raw material charging chute to the vicinity of the center of the dispersion plate. Therefore, the state of the raw material jumping out from the dispersion plate can be made uniform.

As described above, according to the present invention, without increasing the size of the classifier, the functions of dispersion and classification can be maximized individually, and the classification efficiency is increased, thereby increasing the pressure loss of the accompanying classified gas blower. It can be reduced.

Hereinafter, an example of a preferred embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view of an essential part for conceptually explaining the structure of the classification device according to the present embodiment.

First, the structure of the classification device 50 in this embodiment will be described with reference to FIG.
As shown in FIG. 1, the classification device 50 in the present embodiment is surrounded by a casing, the upper portion of the casing is cylindrical, and the lower portion extends from the vicinity of the substantially central portion to the lower side. It has a shape similar to a reverse truncated cone shape with a decreasing diameter.

  The upper part of the casing is sealed with a top plate so that classification gas (air in this embodiment) and raw materials (powder particles) do not leak unnecessarily, but the inner cylinder 65 is supported by a bearing. It is pivotally supported on the top plate of the casing in a rotatable state, passes through the top plate, is inserted into the casing, and is provided with a discharge port 63 for taking out fine powder together with the classification gas.

Here, the lower end of the inner cylinder 65 is fixed to the central portion of the disk-shaped connecting member 56, and a plurality of classification blades are arranged on the outer peripheral edge of the connecting member 56.
The classification blades 52 are attached to the outer peripheral edge of the connecting member 56 at their lower ends, and are equally spaced in the circumferential direction so as to draw a circle centered on the inner cylinder 65.
The classification blade 52 is arranged so that the upper end of the classification blade 52 is close to the top plate arranged on the upper part of the casing so that the classification gas flowing from the annular passage S flows to the discharge port 63 through the classification blade. Further, the openings opened in the top plate by the discharge port 63 are arranged so as to surround from the lower side with the row of the connecting members and the classification blades 52. Therefore, in the present embodiment, the plurality of classification blades 52 are adjacent to each other. Between the circumferential directions of the two classification blades, there is a gap through which the classification gas and fine powder can pass during operation, and the raw material does not pass through the classification blades 52 and does not reach the discharge port 63. It has a structure like this.

  Further, a raw material charging chute 58 passes through the pipe of the inner cylinder 65 while being rotatably supported by a bearing, and the upper end and the lower end of the raw material charging chute 58 protrude from the inner cylinder 65. It has become. A raw material charging port 59 is formed at the upper end of the raw material charging chute 58, and a disc-shaped dispersion plate is fixed to the lower end of the raw material charging chute 58 in a horizontal state.

Here, a part of the casing is formed as a side wall at a position away from the outer peripheral side of the dispersion plate 53 by a certain distance. As will be described in detail later, classification gas blows up an annular passage S formed between the outer peripheral portion of the dispersion plate 53 and the side wall portion, and one of the raw materials jumped out of the dispersion plate by centrifugal force. The part is configured to collide with the side wall.
In the present embodiment, the raw material released from the dispersion plate 53 into the annular passage S and the raw material that collided with the side wall are converted into coarse powder and smaller powder by the classification gas blown up in the annular passage S in the present embodiment. Be separated. Therefore, in this embodiment, one classifying part is constituted by the dispersion plate 53, the side wall, and the annular passage S.

Next, in the present embodiment, with the position of the dispersion plate 53 as a boundary, the casing below it is reduced in diameter toward the lower side, and has a shape similar to a so-called reverse truncated cone shape. The coarse powder outlet 55 is provided at the lower end.
As described above, the raw material that has not been able to get on the classification gas flow in the apparatus falls into the lower casing and slides down so as to gather at the coarse separation outlet 55.

In addition, an inverted conical lower cone 57 whose diameter is reduced toward the lower side is disposed on the bottom surface of the dispersion plate 53. Just below the lower cone 57, below the annular passage S where the classification gas blows up. The gas passage from the gas inlet 61 is provided with the tip opened upward, and the lower end of the lower cone 57 described above is disposed in the state where the gas passage tip is opened.
Therefore, the classification gas blown out from the gas inlet 61 into the classification device 50 by the action of the lower cone 57 can be made to flow evenly in the circumferential direction of the annular passage S.
For this reason, it is possible to reduce waste that the raw material that has been classified once and slides down the casing as coarse powder is again blown from the lower side with the classification gas.

  In addition, since the raw material charging chute 58 fixed to the dispersion plate 53 is connected to the portion protruding above the inner cylinder 65 and the first electric motor 68 fixed to the top plate via a belt, The dispersion plate 53 can be rotated by the rotation of the electric motor 68.

Further, since the inner cylinder 65 that supports the classification blade 52 is connected to the second electric motor 69 provided on the top plate via a belt, the classification blade 52 is rotated by the rotation of the electric motor 69. Can do.

Next, the operation of the classifier 50 configured as described above will be described with reference to FIG.
First, a raw material (hereinafter also referred to as a powder) introduced from the raw material input port 59 passes through the raw material input chute 58 and falls to the vicinity of the central portion on the dispersion plate 53, and reaches the lower end of the raw material input chute 58. It is supplied onto the dispersion plate 53 from the formed opening 54.
Here, in this embodiment, the raw material is supplied in a uniform state on the dispersion plate as a configuration in which four substantially square openings 54 formed at the lower end of the raw material charging chute are provided at equal intervals in the circumferential direction. . However, the configuration of the opening 54 that can be applied to the present invention is not limited to the configuration according to the above-described embodiment, and the opening 54 may be a rectangle or a semicircular shape, and does not depart from the technical idea of the present invention. It is possible to change.

  Since the dispersion plate 53 is rotated by the first electric motor 68 when the raw material is supplied, the supplied raw material is also driven by the rotation of the dispersion plate 53 and starts rotating. Therefore, centrifugal force is generated in the raw material, and the raw material moves toward the outer periphery of the dispersion plate 53, and eventually jumps out from the dispersion plate 53 toward the annular passage S.

The raw material that has jumped out from the dispersion plate 53 reaches the annular passage S between the dispersion plate 53 and the casing side wall portion where the classification gas is blown up, and is thrown out into the annular passage S or collides with the side wall to enter the annular passage S. Thrown out. At this time, the classified gas blown from the gas introduction port 61 is blown up into the annular passage S through the space between the lower cone 57 and the casing as a uniform flow from the lower side. The raw material is blown upward, but the raw material having a large particle size (coarse powder) is not blown up and falls as it is.
The dropped raw material having a large particle diameter falls from the annular passage S and is taken out from the coarse powder outlet 55 at the lower end while sliding down the casing.

In addition, when classifying a raw material with a lot of aggregates, or when there are a lot of aggregates in the fine powder taken out after classification, the rotational speed of the classification blade 52 is kept constant and the dispersion plate 53 Only increase the number of revolutions. By raising the rotation speed of the dispersion plate 53, the jumping speed of the raw material jumping out from the dispersion plate 53 can be increased, and the raw material jumping out from the dispersion plate 53 vigorously hits the side wall of the casing on the side surface of the dispersion plate 53. Since it collides strongly and agglomeration is crushed, the classification efficiency is improved.

  Further, since the classified gas blown into the apparatus from the gas inlet 61 is rectified by the lower cone 57 and the classified gas can be evenly blown up to the entire annular passage S, relatively uniform classification can be performed at any place. Is called.

In addition, since the raw material once blown up by the classification gas is affected by the rotation of the air flow and rises while rotating, the raw material having a relatively large particle size is flown by the centrifugal force generated by the rotation of the raw material. Deviates from the flow of the flow, falls downward and is taken out of the apparatus.
Then, only the powder raw material (fine powder) having a small particle diameter passes through the gap toward the classifying blade 52 and is taken out from the discharge port 63 along with the classification gas.

  In the above embodiment, the driving motors of the dispersion plate 53 and the classification blade 52 are the first motor 68 and the second motor 69. However, the driving motor may be two hydraulic motors or the like. good.

It is principal part sectional drawing for demonstrating the classification apparatus structure which concerns on this embodiment. It is principal part sectional drawing for demonstrating the conventional classification apparatus structure.

Explanation of symbols

50 classifier 52 classifying blade 53 dispersion plate 55 coarse powder outlet 56 connecting member 57 lower cone 58 raw material input chute 59 raw material input port 61 gas inlet 63 discharge port 65 inner cylinder 68 electric motor 69 electric motor

Claims (2)

A raw material inlet and a classification gas outlet are arranged at the upper part of the device, a coarse powder outlet and a classification gas inlet are provided at the lower part of the device, and a disk-like shape is formed at the lower end of the raw material input chute extending vertically downward from the raw material input port. The dispersion plate is fixed and disposed between the classification gas introduction port and the discharge port, and the classification blade is disposed between the dispersion plate and the classification gas discharge port,
By blowing up the classification gas from the inlet to the outlet through a classification blade, the raw material supplied and dispersed on the dispersion plate is separated into coarse powder and fine powder, and a fine powder is obtained. A classification device that takes out the classification gas from the classification gas discharge port disposed in the upper portion together with the classification gas, and extracts the coarse portion from the coarse powder outlet disposed in the lower portion of the apparatus,
An inner cylinder to which the classifying blades are connected via a connecting member is rotatably supported on an apparatus casing, and a raw material charging chute is inserted into the inner cylinder, and the raw material charging chute is inserted into an inner peripheral portion of the inner cylinder. The outer peripheral portion of the raw material is rotatably supported, the upper end and the lower end of the raw material charging chute are protruded from the inner cylinder, the upper end side protruding portion is connected to the first rotary drive unit, and the lower end side protruding portion A classifying device in which an opening is provided in the inner cylinder and the vicinity of the upper end of the inner cylinder is connected to a second rotary driving machine.   The classification device according to claim 1, wherein the openings are provided at equal intervals in a circumferential direction of a lower end portion of the raw material charging chute.

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