JP3446370B2 - Dust removal device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust removing device for removing dust from air or other gas bodies containing dust to obtain clean air or gas. The device of the present invention is
It is especially useful when applied to the production of corrugated paper and the removal of paper dust generated in the fields of processing such as printing and box making.

[0002]

2. Description of the Related Art In factories that manufacture corrugated paper and make boxes, 10% of the material is cut by trimming and punching the edges.
A small amount of scrap is generated. If necessary, these are cut with a catabot or a shredder, and usually they are carried on an air stream and sent to a cyclone, where they are separated from the air stream, and are compacted into blocks by a device called a "beira". This waste paper block is recyclable and is sent to the paper mill.

The cyclone exhaust contains fine paper dust. This has been conventionally discharged to the outside, but since it deteriorates the working environment, improvement has been required.

On the other hand, printing on corrugated cardboard is usually performed by flexographic printing, but as finer and more accurate printing is gradually demanded, paper dust adhering to the corrugated cardboard becomes a problem. . Especially for bar code printing, paper dust must be removed as much as possible. Therefore,
Immediately before printing, air on the paper surface is sucked to remove paper dust. Since this suctioned air cannot be separated into solid and gas by a cyclone, it must be treated by means such as a bag filter.

However, if very fine dust is to be removed with a bag filter, a filter with a small mesh must be used, so that the pressure loss is high and the filter is clogged in a short time, and the suction force is reduced, which is expected. The purpose of can not be achieved.

[0006]

SUMMARY OF THE INVENTION A general object of the present invention is to remove fine dust contained in air or other gas,
An object of the present invention is to provide a device which removes efficiently with a low pressure loss and gives clean air or gas.

A limited object of the present invention is to remove paper powder from air containing fine paper powder, which is required in the steps of manufacturing, printing and processing corrugated board, with a high removal rate and a low pressure loss. The purpose is to provide a device that regenerates clean air to improve the working environment.

[0008]

The dust removing device of the present invention will be described by taking a typical device for removing paper dust of corrugated paper as an example. As shown in the detailed structure of FIG. 5, it comprises the following components.

At least two laterally arranged openings (11) are provided at the top to serve as an inlet for air containing dust, the sides are surrounded by a mesh screen (12), and the bottom is gradually inclined (13). ) And a filter chamber (1A, 1B) leading to the dust outlet (14) provided at the bottom, a dust-containing air conduit (2) common to the filter chamber (1A, 1B), a bottom outlet (14) Dust container (3) installed below the filter, installed in each filter chamber, and raised (1)
1) a closing plate (4) for closing and lowering and opening, and an outlet valve for rising and opening and closing the dust outlet (14) for lowering and closing
(5), a plurality of nozzles (6) that surround the mesh screen (12) of the filter chamber and blow pressurized air from the outside
2), backwash means (6) and pressurized air supply means (not shown) as well as their closing plate (4) and outlet valve (5) for alternating use of each filter chamber. Control means for controlling (not shown).

In the illustrated example, the filter chambers (1A, 1A
The vibrator (7) is attached to the inclined surface (13) of B), and the dust that has fallen onto the inclined surface due to backwashing is discharged from the outlet (1).
It is designed so that it is easy to proceed toward 4). It is recommended that the sloped surface be coated with Teflon to make it slippery.

The vertical movement of the closing plate (4) and the outlet valve (5) is preferably performed by an air cylinder (8).

In the example shown as the backwashing means (6), a pipe is wound around the filter chamber (1A, 1B) in a spiral shape, and a number of holes are formed in the inside thereof to form a nozzle. Other than this, as the backwashing means, for example, a row of pipes arranged in parallel in the vertical direction may be used, or a hollow plate-shaped body having holes may be used.

The dust accumulated in the dust container (3) can be disposed of in a paper bag or a polyethylene bag for disposal. Particularly, paper dust containing a large amount of fibrous components can be pressed. Since they are connected together, subsequent handling is easy. Therefore, it is advisable to form this container in the shape of a rectangular parallelepiped, provide the dust presser (9), and press it again as soon as an appropriate amount has accumulated, to form a rectangular parallelepiped block as a whole. For driving the presser, it is convenient to use an air cylinder. In the illustrated example, the pressing is performed in the lateral direction as is apparent from FIG. 3, but it is needless to say that the pressing may be performed in the longitudinal direction using an air cylinder having a long stroke.

[0014]

In the apparatus shown in FIG. 4, the left filter chamber (1A) is operating and the right filter chamber (1B) is inactive. The dust-laden air coming through the conduit (2) has an opening (11A).
Enters the filter chamber (1A) and exits laterally through the mesh screen (12A) where dust is separated. During this time, the bottom outlet (14A) is closed. If dust has accumulated on the mesh screen, making it difficult for air to pass through, close the outlet valve (5B) of the right filter chamber (1B), and then raise the closing plate (4A) with an air cylinder. , Close the opening (11A) from below. At the same time, the closing plate (4B) of the right filter chamber (1B) is lowered to open the opening (11B).
As a result, the dust-containing air is processed in the right filter chamber (1B).

For the left filter chamber (1A),
As shown in FIG. 5, send pressurized air to the backwash means (6A),
If pressurized air is blown from the outside of the mesh screen (12A), the dust accumulated on the screen is blown off and falls on the inclined surface. If necessary, dust can be collected at the bottom outlet (14A) with the help of the vibrator (7) shown in FIG. 1, and the outlet valve (5A) can be lifted to open and the dust can be collected from the bottom outlet (14A) ( It falls to 3).

When the amount of dust trapped in the right filter chamber (1B) becomes large, the operating filter chamber is switched to the left side by the same operation as above, and the dust is taken out from the right side.

The reason why this device is suitable for removing paper dust depends on the shape of the paper dust. That is, the inventor microscopically observed paper dust, which is a problem in the production and processing of corrugated cardboard, and found that it consisted of a small number of long fibrous substances and most of powdered substances. Knew.
In addition, by examining the paper dust collected in the bag filter used conventionally, it was found that it was the above-mentioned fibrous material. In other words, it has been found that the efficiency is low because conventionally, the fine powdery material passes through the bag filter and only the fibrous material can be collected.

Therefore, the inventor expects that the powdery dust will be collected without passing through the filter by reducing the flow velocity of the air passing through the filter, and the volume of the filter portion will be adjusted to that of the air conduit. A large selection compared to the cross-sectional area gave the expected results. As for the paper dust generated from the processing of corrugated paper, most of the paper dust can be collected by reducing the air flow velocity to a linear velocity of about 2 to 3 m / sec or less.

When the collected paper powder is observed on a microscope with the paper dust still on the filter, there is a fibrous substance on the mesh of the filter and they are intertwined to some extent to form a coarse mesh. It was found that the powdery paper powder adhered to the mesh and the mesh, and the powdery paper powder itself formed a filter. This is considered to be because the paper powder, which looks like a powder, also has a fine shape in which the outer sides thereof are likely to be caught by each other. In this way, even if a filter is formed using a relatively coarse wire mesh such as 70 mesh, finer powder is also collected by the filter forming function of the paper powder itself. A relatively coarse mesh has high backwash efficiency, and the mesh sheet itself has high strength and durability, and is easily available and inexpensive.

[0020]

Industrial Applicability The dust removing device of the present invention can remove dust such as fine paper powder which could not be collected by the conventionally used cyclone with high efficiency, and the pressure loss accompanying the removal. Is relatively small. When dust accumulates and the pressure loss increases, two or more filter chambers can be switched to use, and the dust accumulated during the rest can be backwashed away to make it easily reusable. . During the switching, it is of course possible to continue processing dust-laden air or gas. Backwashing with pressurized air is highly effective and can be returned to a state that is almost the same as the initial state even if it is repeated many times.

The apparatus of the present invention as described above treats the exhaust of the cyclone provided for collecting the waste paper in the factory for manufacturing and processing the corrugated paperboard described above, and the air for which the paper surface is suction-cleaned immediately before printing in the factory for printing. It is most suitable for use in the treatment of blower exhaust, and can also be used for applications such as collecting powder scattered on paper during special printing.

[Brief description of drawings]

FIG. 1 is a side view showing an overall configuration of a typical example of a dust removing device of the present invention, showing a cross section with a part cut away.

2 is a sectional view of the device of FIG. 1 taken along the line II.

FIG. 3 is a sectional view taken along line II-II of the apparatus of FIG.

4 shows the movement of the closure plate and the valve of the device of FIG.

FIG. 5 is a diagram for explaining the situation of the apparatus of FIG. 1 during backwashing.

[Explanation of symbols]

1 (1A, 1B) filter chamber 11 (11A, 11B) opening 12 (12A) mesh screen 13 inclined surface 14 (14A, 14B) exit 2 conduits 3 containers 4 (4A, 4B) Closure plate 5 (5A, 5B) outlet valve 6 (6A) Backwashing means 7 vibrator 8 air cylinders

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Japanese Patent Laid-Open No. 3-278811 (JP, A) Actual Opening 4-73937 (JP, U) Actual Opening Sho 64-1727 (JP, U) Actual Opening Sho 61- 187219 (JP, U) Actually open Sho 60-67125 (JP, U) Actually open 62-202311 (JP, U) Actually open 61-130898 (JP, U) Actually open 3-102497 (JP, U) 56-81108 (JP, U) 56-81815 (JP, U) Fira 6-41815 (JP, U) Registered utility model 3003338 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B01D 46 / 00-46/54

Claims (6)

(57) [Claims] 1. A dust removing device comprising the following components:
It has at least two laterally arranged openings (11) in the upper part that serve as inlets for air containing dust, the sides are surrounded by a mesh screen (12), and the lower part is an inclined surface (13) that gradually shrinks. Filter chamber (1A, 1B) reaching the dust outlet (14) provided at the bottom of the filter chamber (1A,
1B), a duct for air containing dust (2), a container for dust (3) provided below the bottom outlet (14), provided in each filter chamber, ascending and closing the opening (11) and descending A plurality of blown air to enclose the closing plate (4) and the outlet valve (5) that rises to open and close the dust outlet (14) and closes to descend and close the filter chamber mesh screen (12). Of the closing plate (4) and the outlet valve (5) for alternating use of the backwash means (6) with the nozzle (62) and the pressurized air supply means and the respective filter chambers (1A, 1B). Control means for controlling the drive. 2. The dust removing device according to claim 1, wherein a vibrator (7) is attached to the inclined surface of the filter chamber. 3. The dust removing device according to claim 1, wherein the closing plate (4) and the outlet valve (5) are driven by an air cylinder (8). 4. The backwash means (6) comprises a filter chamber (1).
A nozzle formed by forming a large number of holes inside a spirally wound pipe around (A, 1B).
Dust remover. 5. The dust removing device according to claim 1, wherein the dust container (3) is provided with a dust presser (9). 6. A mesh screen of 70 to 200
The dust removing device according to claim 1, which is used for removing paper dust from air containing the paper dust by using a mesh wire mesh.