JPS60183054A - Cyclone type classifier - Google Patents

Abstract

PURPOSE:To make a classification ratio variable and to attain to make an apparatus compact, by arranging a movable buffle in an outer cylinder. CONSTITUTION:When air containing product coarse particles and fine particles is sent into a blower from a charging port 11, said air is fallen while revolved in the passage 25 between an outer cylinder 10 and an inner cylinder 15 and coarse particles are fallen through a passage 26 while fine particles or froth are raised through the inner cylinder 15 to be discharged to the open air through an exhaust port 19 and a filter. The coarse particles are flowed along the inner surface of the outer cylinder by the action of centrifugal force during the revolution in the passage 25 and fallen by the action of gravity while fine particles or froth are collected to the central side and classified. When a buffle 13 is raised by operating a nut 21, the cross-sectional area of the passage 26 is reduced and the fine mesh particles in the coarse particles are flowed to the side of the exhaust port 19 along with fine particles and a classification ratio is changed.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides products with coarse grains, fine powder or floss (string-like fibrous material, etc.).
This invention relates to a cyclone classifier for classifying coarse product particles from mixed air.

(Prior Art) Conventional wind classifiers of various structures are known, such as the Eltriator-1 secondary air classifier.

For example, the elutriator shown in Fig. 1 has a circular outer cylinder l.
, an input port 2, a fixed baffle 8.4, etc.

Each baffle 8.4 has the shape of two integrated cones, is arranged on the center line of the outer cylinder 1, and has a passage 5.6 with an annular cross section formed between it and the inner surface of the outer cylinder 1. The inlet 2 opens upward from directly below the fixed baffle 8, and air mixed with product coarse particles and fine powder or floss is ejected from the inlet 2, is evenly distributed along the fixed baffle 8, rises, and flows into the passageway. 5, the flow speed increases, and it continues to enter the wide wall between the upper and lower panfuls 4.3, and continues! It ascends around the baffle 4 through the passage M6, and fine powder or 70s is taken out from the discharge lower at the upper end of the outer cylinder, and coarse particles are taken out from the outlet 8 at the lower end of the outer cylinder. In the conventional secondary air type, in addition to the air from the input port 2, another secondary air is supplied to the fixed baffle 3, and by adjusting the amount of this secondary air, the classification capacity can be increased. . In this way, all conventional wind classifiers use the difference in floating speed between coarse particles and fine particles to classify them. It is easily subject to restrictions and becomes expensive.

Conventionally, a tangential input port was provided at the upper end of the circular outer cylinder, a cone portion was provided in the lower half of the outer cylinder body, the diameter of which became smaller as it went downwards, and the lower end was used as a coarse particle outlet. A cyclone classifier is also known that has a fixed exhaust cylinder with an open bottom end. However, in that case, the classification rate cannot be changed because the shape of the cone remains unchanged, and the height increases due to the presence of the cone, making it impossible to avoid problems similar to those shown in FIG.

(Objective of the Invention) An object of the present invention is to make the classification rate variable by arranging a movable baffle inside the outer cylinder, thereby making it possible to make the apparatus more compact.

(Structure of the Invention) The present invention provides a tangential inlet at the upper end of a circular outer cylinder, a coarse particle outlet at the lower end, and an exhaust inner cylinder with an open lower end at the center. A baffle chamber with a different cross-sectional area relative to the outer cylinder body is provided at the bottom of the tube, and the baffle is arranged in the buckle chamber so that it can be raised and lowered, and the cross-sectional area of the coarse particle passage between the inner surface of the buckle chamber and the baffle can be adjusted by raising and lowering the baffle. This is a cyclone type classifier that is characterized by being variable.

(Example) FIG. 2 is a longitudinal cross-sectional view of a cyclone classifier according to the present invention.
FIG. 3 is a cross-sectional view of FIG. 2, and FIG. 4 is a partially cutaway perspective view. Mainly in FIG. 2, the circular outer cylinder IO is provided with a tangential inlet 11 at its upper end, and the inlet 11 is connected to a feeder (not shown) for product coarse particles containing fine powder.

The lower end of the outer cylinder 10 has a reed as a cone part 10a whose diameter increases as it goes downward in a relatively short section L1, and a flange 12ti at the lower end for feeding a hopper (not shown) for storing coarse product particles, for example. Connected to the mouth. Of course, the flange 12 may be connected to a hopper or various manufacturing equipment via a duct. A low conical baffle 1 is installed in the buckle chamber in the cone section 0a that serves as the outlet for product coarse particles.
The rods 14, which are integral with the baffle 18, are supported by the inner cylinder 15 so as to be movable up and down. The illustrated inner cylinder 15 is also supported at the center of the outer cylinder 10 so as to be able to rise and fall. The inner cylinder 15 is tightly fitted into a hole 16 provided in the earthen wall of the outer cylinder 10 while maintaining airtightness, and the bracket 17 attached to the outer surface of the inner cylinder 15 is connected to the bolt 1 attached to the earthen wall of the outer cylinder 10.
8 can be used to freely move up and down at a height of 1g' and can be stopped at the desired position. The inner cylinder 15 protrudes upward from the outer cylinder 1o, has an exhaust port 19 at its upper end, and has a plurality of bolts 31 parallel to the rod 14 on the upper surface of the earthen wall 3o.
is welded. The rod 14 is inserted into the central hole 1 of the upper wall 3o.
It protrudes upward from 9 and has a platinum 20 at its upper end. The bolt 81 fits into the hole of the platen) 20, and the bolt 81 fits into the hole of the platen) 20.
1 fixes the vertical position of the bracket 2o. Input port 11Kt-, i As shown in Fig. 8, a damper 28 is built in, and this damper 28 is fixed to a vertical shaft 24, and by rotating together with the shaft 24, the damper 28 is attached as shown in Fig. 8 by a two-dot chain line. It can be rotated in a stepless manner in the direction of the arrow from the fully open position shown, and held, for example, at the control position shown by the solid line. Specifically, a lever is attached to the upper end of the shaft 24 that protrudes upward from the input port 11, and the lever and the input port 1
A friction mechanism or other brake may be disposed between the lever and the lever to maintain the desired position t.

Next, the operation will be explained. When air containing product coarse particles and fine powder is sent from the inlet 11 by a blower, this air is transferred to the outside fr
The passage 25 between J10 and the inner cylinder 15 descends while turning completely, and the cross-sectional area of the passage 26 at the lower end of the outer cylinder 1O is narrowed by the baffle 1B.The coarse particles fall downward through the passage 26. The fine powder or floss is reversed upward in the air reservoir 27 between the inner cylinder 15 and the backflush 18, rises within the air, and is discharged into the atmosphere through the exhaust port 19 and a filter (not shown). (dashed arrow).

While rotating in the passage 25, the coarse particles fall along the inner surface of the outer cylinder 10 due to the action of gravity due to the action of centrifugal force, and the fine powder or floss with lower specific gravity gathers towards the center and is classified as described above. When the capacitor 18 is raised by operating the nut 21, the cross-sectional area of the passage 26 is reduced, the amount of coarse particles taken out downward is reduced, and the fine particles among the coarse particles are exhausted together with the fine powder. It starts to flow towards the mouth 19 side. In this way, the classification rate changes. When the inner WJ 15 is lowered by operating s7 and 18, and then the baffle 13 is kept at the narrowed position where the passage 26 is sufficiently narrowed as shown by the two-dot chain line by operating the lower part 21, the inner WJ 15 in the air reservoir 27 portion is lowered. The cross-sectional area of the passageway decreases, the flow velocity increases, and the particles sent to the exhaust port 19 gradually become larger. That is, the classification rate can be controlled in two stages by raising and lowering the inner cylinder 15. Further, by further opening and closing the damper 28 from the position indicated by the solid line and changing the charging speed at the input port 11 according to the grains, the centrifugal force acting on the grains can be changed and the separation efficiency can be changed.

(Effects of the Invention) According to the present invention, the cross-sectional area of the passage 26 between the baffle 18 and the cone portion 10a by raising and lowering the baffle 13 with respect to the gas swirling within the passage 25 between the outer cylinder 10 and the inner cylinder 15. is made freely changeable, so the classification rate can be changed steplessly by changing the position of the baffle 18, for example, by changing the distance L2i between the lower end of the baffle 18 and the upper end of the cone portion 1oa.
Applications will expand. Furthermore, since the cross-sectional area of the passage 26 is changed by raising and lowering the baffle 1B inside the outer cylinder 10, a long cone part is not required, and the device is therefore lower in height, eliminating installation restrictions and reducing manufacturing costs. As described above, the present invention has the advantage that the feeding state (quantity) of particles can be easily adjusted by adjusting the position of the baffle 13, and the apparatus can be made more compact.

(Other Embodiments) Instead of the cone portion lOa, a full annular stepped portion may be provided to provide a low large diameter portion. Inner cylinder 15. The lifting device for the rod 14 may be a hydraulic type, a pneumatic type, or an electric type using a small motor or the like.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing the conventional structure, Fig. 2 is a longitudinal sectional view of the device according to the present invention, Fig. 8 is a sectional view of Fig. 2, and Fig. 4 is a partially cutaway view. FIG. 10...
・Outer cylinder, ti...Inlet, 18...-baffle, 15
...Inner cylinder, 26...Coarse particle passage (baffle chamber)

Claims (1)

[Claims] A tangential input port is provided at the upper end of the circular outer cylinder, a coarse particle outlet is provided at the lower end, and an inner cylinder for exhaust with an open bottom end is provided at the center, and the cross-sectional area of the outer cylinder is set at the bottom of the outer cylinder. A cyclone classifier characterized in that baffle chambers with different sizes are provided, the baffles are arranged in the baffle chambers so as to be movable up and down, and the cross-sectional area of the coarse particle passage between the inner surface of the baffle chambers and the baffles is made variable by the up and down movement of the baffles.