JPH0217665Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an improvement of a classifier that separates granular raw materials into coarse particles and fine particles, and in particular employs a non-contact method for the sealing means.

(Prior Art) The present applicant previously proposed a classifier (Japanese Patent Application No. 37615/1983) that separates granular raw materials into coarse particles and fine particles.
The basic structure of such a classifier is shown in FIG. In this figure, 1... is a plurality of cylindrical classification screens vertically installed radially in the circumferential direction in the upper chamber of the casing 2, and air purge pipes 3... are arranged to face the classification screens 1... . The classifying screens 1... are each connected to rotatable drive shafts 4..., and since the drive shafts 4... are rotated by a chain or the like connected to the upper end, the classifying screens 1...
It is also rotatable. The granular raw material inputted from the raw material supply port 5 at the upper part of the casing 2 flows through the opening 6.
The particles enter the classification screen 1 and are separated into coarse particles and fine particles according to their particle size.The coarse particles pass through the coarse particle chamber 7 and are discharged from the lower end opening 8, and the fine particles pass through the fine particle discharge pipe provided in the center. 9 and is discharged from the side openings.

In the above, when classifying, the classification screen 1...
While rotating, air is injected into the interior from the openings of air purge pipes 3 connected to a high-pressure air source.

(Problems to be solved by the invention) In the conventional classifier described above, the raw material input chamber 1
0 and coarse particle chamber 7, and a classification chamber 11 for performing separation work.
and are sealed by a mechanical sealing device 12. Therefore, fine particles in the raw material enter the sliding portion of the sealing device 12, resulting in abrasion of the sliding portion and shortening the life of the sealing device 12.

In view of the above-mentioned problems, the present invention provides a classifier equipped with a sealing means that does not require consideration of wear of sliding parts.

(Means for Solving the Problems) The present invention has a classification screen that is rotatably supported in a classification room, etc., and a partition wall that partitions each of the upper and lower compartments. It is configured to form an open air chamber and supply air to the air chamber to seal between the classification chamber and other compartments.

(Function) According to the above configuration, a non-contact type sealing device using air is provided on the classification screen which is rotatably disposed in each compartment in the casing of the classifier, so that it is not possible to slide as in the conventional case. There is no wear on the parts, and the seal can be reliably maintained for a long period of time.

(Example) An example of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing the internal structure of a classifier according to a first embodiment of the present invention. The same elements as in the conventional classifier are given the same reference numerals.

In FIG. 1, 2 is a substantially cylindrical casing, 7 is a funnel-shaped coarse particle chamber formed at the bottom, and 10 is a raw material input chamber. The inside of the casing 2 is divided into a raw material input chamber 10, a classification chamber 11, and a coarse particle chamber 7, which constitute compartments. The raw material input chamber 10 has a raw material supply port 5 in the upper part, and is equipped with a conical raw material distributor 13 inside. The classification chamber 11 also serves as a particle chamber, and the separated particles are taken out to the outside through a discharge pipe 14.

1... is a classification screen, the overall shape of the classification screen 1 is cylindrical, and the material input chamber 1 is
0, the classification chamber 11 and the coarse particle chamber 7 are installed vertically. The classification screen 1 has an upper holder 1 having an opening 6.
5 and a cylindrical lower holder 16, and an upper holder 15.
and the lower holder 16 are connected and integrated by an inner cylinder member 17. A cylindrical screen 18 of a desired mesh is attached between the upper holder 15 and the lower holder 16 with a band 19. A plurality of classification screens 1 formed in this manner are arranged radially in the circumferential direction inside the casing 2. The upper holder 15 of the classification screen 1 is coupled to the drive shaft 4 in the drive device 20, and is rotated by rotational force applied from another drive source via a sprocket 21 provided at the upper end. The classification screen 1 is rotatable.

Inside the casing 2, there is an upper partition wall 22 that partitions the raw material input chamber 10 and the classification chamber 11, and the classification chamber 11.
and a lower partition wall 23 that partitions the coarse particle chamber 7 are formed. In the upper partition wall 22 and the lower partition wall 23, an opening with a ring-shaped flange 24 hanging downward is formed at the location where the classification screen 1 is disposed. A ring-shaped air chamber 26 is formed by providing a flange 25 around the periphery. As a result, the air chamber 26 opens into the raw material input chamber 10 and the classification chamber 11, which form upper and lower compartments, and into the classification chamber 11 and the coarse particle chamber 7. On the other hand, upper holder 1
5 and the lower holder 16 are formed with ring-shaped flanges 27, 27 that stand upward and have an air supply/distribution function by being inserted into the air chamber 26.

Further, in the center of the casing 2, double inner and outer pipes 28 and 29 are inserted from below. The inner tube 28 communicates with each air chamber 26 formed in the upper partition wall 22 and the lower partition wall 23 to send compressed air. On the other hand, the outer pipe 29 is communicated with air purge pipes 30 which are disposed at the center of the classification chamber 11 so as to face each other in the entire longitudinal direction of the screen 11 of each classification screen 1. Compressed air from an air compressor is supplied to the classification screens 1 through air purge pipes 30.

According to the above configuration, the granular raw material supplied from the raw material input port 5 is passed through the opening 6 to the classification screen 1.
..., where the fine particles are sent to the fine particle chamber through the screen 18 by the air flow from the air purge pipe 30, and the coarse particles fall as they are and are sent to the coarse particle chamber 7, respectively. taken out.

Further, when air is supplied through the pipe 28, this air is guided to the air chamber 26, and is branched from the air chamber 26 into two directions. That is, the upper partition wall 2
2, the classification chamber 1 is inserted through the outer slit S ₁ .
1 and through the inner slit S ₂ to the raw material input chamber 10
Air is supplied to each. On the other hand, the lower partition wall 23
In this case, air is supplied to the coarse particle chamber ₇ via the outer slit S1 and to the classification chamber ₁₁ via the inner slit S2.

According to the above action, the flanges 24, 25, 27
A non-contact type sealing device is constituted by the air chamber 26 to which air is supplied, and the raw material input chamber 10, the classification chamber 11, and the coarse particle chamber 7 are each isolated from each other by this, and airtightness is maintained from each other. Ru. Furthermore, the sealing device does not have any sliding parts, so problems such as wear do not occur.

FIG. 2 shows a second embodiment of the invention. In this embodiment, the upper holder 115 is used instead of the flange 27 formed on the upper holder of the classification screen 1...
The upper edge 115a of the upper edge 115a is used. The air purge pipes 30 are disposed outside the classification screen 1, and air is supplied to the air chambers 26 formed in the upper partition wall 22 and the lower partition wall 23 through supply pipes 28. are doing. Note that the particle discharge pipe 31 is provided in the center. The other configurations are the same as those in the embodiment described above, and therefore are given the same reference numerals.

In the above embodiment, the raw material receiving ports in the classification screens 1 are opened upward, so that the granular raw materials can be efficiently received.

FIG. 3 shows a third embodiment of the present invention. In this embodiment, an air chamber 26 is formed by flanges 124 and 125 in the upper partition wall 22 and the lower partition wall 23 to open upward, and flanges for air supply and distribution are provided at the upper edge of the upper holder 215 and the lower holder 116. 32 is installed vertically,
It is configured to be inserted between flanges 124 and 125. Regarding other configurations, the same elements as in the previous embodiment are given the same reference numerals.

In the embodiment shown in FIG.
A ring member 33 having a U-shaped cross section is attached to the inner peripheral surface of the hole through which the classification screen 1 is inserted, and a ring member 34 having a U-shaped cross section is also attached to the opposing peripheral portion of the upper holder 315. .
A box-shaped air chamber 26 is formed by these ring members 33 and 34, and slits S ₃ and S ₄ are formed in opposing parts thereof. The air chamber 26 has a tube 28
Air is supplied by. Note that the sealing device in the lower partition wall 23 is also configured in the same manner.

FIG. 5 shows a further modification of the above embodiment, in which a ring member 133 made by reducing the diameter of the ring member 33 is provided in the hole of the upper partition wall 22, and the inner surface of the ring member 133 is attached to the upper holder 415. The air chamber 26 and the slits S ₃ and S ₄ are directly opposed to the outer peripheral surface.
is formed. 28 is a pipe that supplies air to the air chamber 26.

(Effect of the invention) As explained above, according to the invention, in a classifier, each chamber of the classification screen installed vertically and rotatably in the raw material input chamber, the classification chamber 11, and the coarse particle chamber can be separated. Since the sealing device is configured in a non-contact manner using air, etc., there is no wear or sliding resistance on the sealing part, and since airflow is generated around the sealing part, there is no problem of particles remaining and accumulating. This effect is achieved.

[Brief explanation of drawings]

Figure 1 is a longitudinal sectional view of the classifier according to the present invention, Figure 2
3 and 3 are similar to FIG. 1 according to a modified embodiment, FIG. 4 is a diagram of another embodiment showing only the structure of the sealing device, and FIG. 5 is similar to FIG. 4 according to a modified embodiment. FIG. 6 is a diagram similar to FIG. 1 of the conventional classifier. In the drawing, 1 is a classification screen, 2 is a casing, 3 and 30 are air purge pipes, 4 is a drive shaft, 5 is a raw material input port, 7 is a coarse particle chamber, 9 and 14 are fine particle discharge pipes, 10 is a raw material input chamber, 11 is the classification room, 15,
115, 215, 315, 415 are upper holders, 1
6,116 is the lower holder, 18 is the screen, 22
23 is an upper partition wall, 23 is a lower partition wall, 26 is a sealing air chamber, 28 is an air supply pipe, and 29 is a compressed air supply pipe.

Claims (1)

[Scope of claim for utility model registration] A substantially cylindrical casing is partitioned into vertical compartments such as a classification chamber, and the classification chamber and other compartments are connected without direct contact using mechanical seals or the like. A classifier that separates and extracts the granular raw material supplied from the raw material input port according to particle size by installing multiple cylindrical classification screens rotatably vertically in the classification chamber and applying compressed air to the classification screens. In this step, an air chamber opening into each of the upper and lower compartments is formed at the boundary of the partition consisting of a partition wall that partitions each of the upper and lower compartments of the classification screen, and air is supplied to this air chamber to separate the above-mentioned classification room and other compartments. A classifier characterized in that the chamber is separated from the chamber.