JPH06106132A - Classifier - Google Patents

Abstract

PURPOSE:To classify fine particles to deliver them from slits and to enable operation reduced in clogging by forming a large number of the slits provided to the peripheral wall of the classifying drum provided in a main body in a rotatable manner so as to provide intervals in the axial direction of the drum into an outer contour shape expanded in open area outwardly. CONSTITUTION:When the granular raw material charged from a charging port 1a is supplied to a screw feeder 3, the raw material is sent into a classifying drum 4 by the screw feeder whose rotary main shaft 2 is rotationally drive by an electromotive shaft 2b. Since the classifying drum 4 itself is also integrally rotated along with the rotary main shaft 2, the fine particles of the granular raw material is recovered on the side of a discharge port 1b from the slits 6 running over the total length of the drum in the circumferential direction thereof and coarse particles having a large particle size are sent to the righthand end of the classifying drum as they are to be recovered on the side of a discharge port 1c. At the time of this classifying operation, only particles smaller than the open width of the slits pass through the slits by the shapes of a ring 5 and the slits 6 and rapidly discharged to the outside without clogging the slits because the open areas of the slits are outwardly increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary classifier for classifying various granular raw materials into coarse particles and fine particles according to their particle sizes.

[0002]

2. Description of the Related Art Various classifiers are used to classify granular raw materials according to their particle size. The basic structure of this classifier is to apply a centrifugal force to the granular raw material charged in the wire-mesh type classification flow path by a screw feeder, etc. by the high-speed rotation of the classification flow path, and the fine particles of small weight around the flow path. The particles are discharged from a classification screen provided in the above and classified with coarse particles. As another method, there is a method in which a wire mesh-like rotary screen is provided in a horizontal cylinder, and fine and coarse particles are classified by inclining and rotating the classifier at a low speed.

Examples of such a classifier include, for example, Japanese Patent Laid-Open No. 62-33583 and Japanese Patent Laid-Open No. 1-262972.
There is one described in the publication. These are similar to the basic structure of the classifier described above, in which a hollow cylindrical screen is placed in the classification flow passage, and fine particles passing through this and coarse particles discharged through the screen as they are. It is to classify into.

[0004]

However, a screen having many holes such as punching metal is used as the screen. Therefore, when the particle size is close to these holes, the particles may be stuck in the holes and become immobile, which may cause clogging. Especially when classifying by using powder pressure or centrifugal force in the classifying channel, the particles will fit into the holes with strong force and it will be impossible to remove them during operation. near.

As described above, if the holes of the screen are clogged with particles, the efficiency of the classification process is reduced, and it is necessary to remove the particles from the clogged portion. In this work, there is no choice but to push the particles out of all the holes clogged with the particles or push them back in, and the work is done by taking out the screen from the main body of the classifier.
Further, in order to remove the particles from a large number of holes, the particles are removed one by one, or they are removed by vibrating from the outside by a sieving effect, so that the processing time also becomes long.

As described above, in the conventional classifier, the removal work when the particles are clogged in the screen is complicated, the work load is large, and the operation rate is inevitably lowered.

The problem to be solved in the present invention is to make it possible to easily remove particles from a screen member simultaneously with classification in various classifiers.

[0008]

A classifier according to the present invention has a hollow cylindrical classification drum as a screen member for classification in a main body having a charging port and a discharging port for fine particles and coarse particles. It is characterized in that it is rotatably provided, and that the classification drum has an outer shape in which a large number of slits running along the entire length in the circumferential direction of the peripheral wall of the classification drum are opened at intervals in the axial direction.

Further, a scraper which can be freely taken in and out from the outside of the classification drum can be provided in the slit.

[0010]

When the granular raw material from the charging port is fed into the classifying drum arranged as a screen member, fine particles come out from the slit cut in the circumferential direction and are collected from the discharging port for fine particles, and the coarse particles are classified. From inside to the outlet for coarse particles.

Further, even if the slit is clogged with particulate matter, the clogging of the classification drum can be eliminated by inserting a scraper into the slit. As a result, it is not necessary to take out the classification drum outside the main body and remove it. Further, if the opening cross-sectional shape of the slit is appropriate for removing the particulate matter, the particulate matter can be quickly removed by the scraper.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front vertical sectional view of a classifier according to the present invention, and FIG.
Is a cutaway plan view thereof, and FIG. 3 is a longitudinal sectional view taken along the line AA of FIG.

In the figure, at the upper end of the body 1 of the classifier,
The charging port 1a for the granular raw material is provided so as to be offset to the left side, and the discharge port 1b for fine particles and the discharge port 1c for coarse particles are provided at the lower end, respectively. Then, as shown in FIG. 3, a casing 1d of a screw feeder having a feeding hopper is incorporated inside the charging port 1a.

On the upper part of the main body 1, a rotary spindle 2 is provided coaxially with the casing 1d. The rotating main shaft 2 is supported by a pair of bearings 2 a provided outside the main body 1, and the motor 2
A drive system is connected to b through a chain 2c. Further, in order to prevent leakage of dust generated during classification, a shaft sealing portion 2d such as a gland packing is provided between the main body 1 and the rotary spindle 2.

A screw feeder 3 is attached to the rotary main shaft 2 at a position corresponding to the lower part of the feeding hopper, and a classification drum 4 is connected to the right side of the screw feeder 3. The screw feeder 3 has a generally used spiral blade and has a function of feeding the granular raw material from the charging hopper and discharging it to the classification drum 4.

The classifying drum 4 has a hollow cylindrical shape, and as shown in FIGS. 1 and 3, a plurality of diametrically extending bosses 4a fixed to the rotary spindle 2 correspond to both ends in the axial direction. The rotary spindle 2 is integrated with the arm 4b. Further, it has a framework structure in which a stay 4c installed parallel to the axis of the rotary main shaft 2 is connected to the tips of these arms 4b.

The outer shell of the classifying drum 4 is constructed by arranging a large number of rings 5 at intervals from each other and providing a slit 6 between these rings 5.

FIG. 4 is an enlarged view showing a portion surrounded by a circle in FIG. 1, and the ring 5 has a substantially trapezoidal cross section in which the axial length on the inner peripheral side is the maximum and is shortened toward the outer peripheral side. Has a shape. Therefore, the slit 6 formed between these rings 5 has a minimum width on the inner peripheral side and becomes wider toward the outer peripheral side. On the contrary, it has an opening cross-sectional shape that minimizes the opening area on the inner peripheral side of the ring 5.

As shown in FIGS. 1 and 2, the classification drum 4
The rings 5 are arranged in the axial direction at a constant pitch, and the slits 6 formed by the rings 5 are used for discharging fine particles. That is, instead of forming a large number of holes on the screen as a whole for the purpose of classifying and discharging fine particles as in the prior art, the slit 6 cut along the entire length in the circumferential direction is used for classification.

Further, an auxiliary shaft 7 is provided inside the main body 1 along the vicinity of the outer peripheral surface of the classification drum 4. This auxiliary shaft 7
Is arranged in parallel with the axis of the rotary main shaft 2, and both ends thereof are projected to the outside of the main body 1 so that this part can be connected to a drive system or a handle for manual operation. And
As shown in FIGS. 2 and 3, the auxiliary shaft 7 is provided with a scraper 8 protruding in the radial direction.

As shown in the enlarged view of FIG. 5, the scraper 8 is made by integrally penetrating the auxiliary shaft 7 in its radial direction, and the material thereof is steel wire or the like having appropriate strength and elasticity. Used. The scraper 8 is located at a position corresponding to the slit 6 of the classifying drum 4 as shown in FIG. Further, the length of the scraper 8 is as shown in FIG.
The tip of the auxiliary shaft 7 penetrates through the slit 6 and is inserted into the classification drum 4 by the rotation of the auxiliary shaft 7.

In the above structure, the granular raw material charged from the charging port 1a is supplied to the screw feeder 3 from the casing 1d. On the other hand, the rotating main shaft 2 is rotationally driven by the electric shaft 2b, and the granular raw material is sent into the classifying drum 4 by the screw feeder 3. Since the classifying drum 4 itself also rotates integrally with the rotary spindle 2,
Fine particles of the granular raw material are collected from the slit 6 to the discharge port 1b side, and large coarse particles are sent to the right end of the classification drum 4 as they are and collected to the discharge port 1c side.

At the time of this classification operation, depending on the shapes of the ring 5 and the slit 6 shown in FIG. 4, when the particulate matter goes out, the minimum width of the slit 6, that is, the opening width of the slit 6 on the inner peripheral surface of the ring 5. Only those smaller than will escape to the outside. For this reason, when the granular material enters the slit 6 from the inner peripheral surface of the ring 5, the opening area up to the outer side increases, so that the granular material is quickly discharged without being clogged in the slit 6.

However, even if the granular material is clogged in the slit 6, it can be automatically removed by rotating the scraper 8 and the classification drum 4 inserted in the slit 6.

Further, if the scraper 8 is made of elastic wire such as steel wire, high load of the classification drum 4 and breakage of the scraper 8 due to elastic deformation of the scraper 8 do not occur even when the scraper 8 is strongly clogged. Even if the scraper 8 is worn, if the auxiliary shaft 7 is rotated and a new scraper is inserted, the classification operation can be continued without stopping the equipment.

[0026]

According to the present invention, fine particles can be classified and cut out from the slits formed in the peripheral wall of the rotary classifying drum, and the operation can be performed with less clogging.

Even if clogging occurs, by inserting the scraper into the slit and rotating the classification drum, it is possible to remove the clogged particulates from the slit, and the clogging can be easily performed without disassembling the device. The obstacles caused by can be eliminated. Therefore, maintenance and inspection are easy and stable continuous operation is possible, and the operating rate is improved.

[Brief description of drawings]

FIG. 1 is a front vertical cross-sectional view of a classifier of the present invention.

FIG. 2 is a cutaway plan view of the classifier of FIG.

FIG. 3 is a vertical sectional view taken along the line AA of FIG.

FIG. 4 is an enlarged cross-sectional view of a main part showing a shape of a ring and a slit, which is a part surrounded by a circle in FIG. 1.

FIG. 5 is a vertical cross-sectional view of a main part showing movements of a slit of a classification drum and a scraper.

[Explanation of symbols]

 1 main body 1a loading port 1b, 1c discharge port 2 rotary main shaft 3 screw feeder 4 classification drum 5 ring 6 slit 7 auxiliary shaft 8 scraper

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tatsuhisa Iwata 59 Nippon Steel Plant Design Co., Ltd. 46 Nakahara, Tobata-ku, Kitakyushu City, Fukuoka Prefecture (72) Inventor Takashi Ando 3-chome, Kaminomachi, Takamatsu City, Kagawa Prefecture No. 1-4 within Shiden Engineering Co., Ltd. (72) Inventor Yukishige Asada 3- 1-4, Kaminomachi, Takamatsu City, Kagawa Prefecture Within Dentsu Engineering Co., Ltd. (72) Masahiro Nitta, Takamatsu City, Kagawa Prefecture 3-4 Nonomachi Shiden Engineering Co., Ltd.

Claims (2)

[Claims] 1. A hollow cylindrical classification drum serving as a classification screen member is rotatably provided inside a main body having a charging port and a discharge port for fine particles and coarse particles, and the classification drum is A classifier characterized in that a plurality of slits running along the entire length in the circumferential direction of the peripheral wall are formed in an outer shape with a large number of slits arranged at intervals in the axial direction. 2. The classifier according to claim 1, comprising a scraper inside the slit, the scraper being able to be taken in and out from the outside of the classification drum.