JPH1028831A - Powder recovering and transferring apparatus and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently transfer the powder in a hopper by easily crushing the powder deposited on fabric by floating the fabric coming into contact with the inner peripheral surface of a hopper part at a time of pressure reduction. SOLUTION: This apparatus is provided with a container 1 having a hopper part recovering a powder separated from air, fabric 8 laid on the inner peripheral surface of the hopper part 1b and floated so as to be separated from the inner peripheral surface of the hopper part 1b by evacuating the container 1 and a first opening and closing valve 10 for transferring a powder disposed on the way of the recovered powder transfer pipe 9 connected to the vicinity of the bottom part of the hopper part 1b and opened when evacuation is released and, wen evacuation is released, the powder in the hopper part 1b is forcibly sent into the recovered powder transfer pipe 9 by a powder feed means P.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method in which a gas containing powder such as dust is introduced into a container and filtered by a filter member, and the powder captured on the filter member by the filtration is placed in a hopper. The present invention relates to a powder collecting and transferring apparatus and a powder collecting and transferring method used for collecting and transferring to the outside.

[0002]

2. Description of the Related Art As a conventional powder collecting and transferring apparatus, for example, a so-called bag filter is known. This method is used, for example, when filtering dust-containing gas generated in various industrial material processing steps using a filter cloth (filter member). Since the filter cloth is used in a bag form, dust collection efficiency is high. As the filtration rate is slower and the dust accumulates on the filter cloth, the pressure drop increases. For this reason, while the dust collection operation is continued during the dust collection process or the dust collection operation is temporarily stopped, the backflow of the filter cloth is blown or mechanical vibration is applied to the filter cloth to deposit on the filter cloth. Dust must be removed. Therefore, in order to avoid inconvenience caused by stopping the above-mentioned filtration work when the amount of dust to be collected is large or dust is removed, a plurality of such bag filters are juxtaposed and each of them is selectively used. Then, the filtration operation is stopped to reduce the decrease in the filtration efficiency as a whole. On the other hand, the dust accumulated on the filter cloth and removed is collected at the bottom of the hopper at the bottom of the container constituting the bag filter, and in many cases, the dust collection operation is temporarily stopped.
The powder was collected by opening a valve provided at the bottom. Also, in order to automate this dust collection work, a recovery powder transfer pipe is provided near the bottom, and the recovered powder is taken out of the container by air transfer, and is discarded or reprocessed. I have. The gas (air or gas) separated from the powder is discharged out of the container in a separate system, and is used after being discarded or reprocessed.

[0003]

Since the conventional bag filter is constructed as described above, when the dust dropped from the filter member such as filter cloth is collected in the hopper, it is formed on the inner peripheral surface of the hopper. Even if an attempt is made to take out the collected powder to the outside of the container by air transfer through a collected powder transfer pipe having one end opened in the hopper portion, the collected powder is deposited near the opening end of the collected powder transfer pipe. In some cases, only the powder can be transferred to the outside, and the powder except for the vicinity of the opening end may remain in the hopper. Therefore, it is necessary to disintegrate the powder that has accumulated and solidified in the hopper by applying vibration to the container, and new equipment must be added, and sufficient disintegration and re-deposition effects cannot be obtained. As a result, there has been a problem that the transfer efficiency of the powder is significantly deteriorated.

[0004] The present invention has been made in view of the above circumstances, and the hopper portion is formed using a film so as to bend inward of the hopper by negative pressure inside the container, thereby forming a film on the film. Provided are a powder collection and transfer device and a powder collection and transfer method that can crush and re-deposit the powder collected by falling and collecting, thereby efficiently transferring the powder in the hopper to the outside of the container. The purpose is to do.

[0005]

According to a first aspect of the present invention, there is provided a container having a hopper for accommodating powder, and a method for transferring collected powder connected near a bottom of the hopper. A first opening / closing valve for transferring powder that is provided in the middle of the pipe and that is opened when the negative pressure is stopped; and that transfers the powder in the hopper section into the recovered powder transfer pipe when the negative pressure is stopped. Powder feeding means for forcibly feeding powder, wherein at least a part of the hopper is configured to bend inward by negative pressure inside the container. The invention according to claim 2 has a structure in which at least a part of the hopper portion is formed of a film made of a flexible material such as cloth or resin, and the film is bent inward by negative pressure. It is characterized by doing. According to a third aspect of the present invention, the hopper portion is composed of a hopper portion main body, a cloth laid on the inner surface thereof, and a flexible film body such as a resin, and the film body is formed by the hopper by negative pressure evacuation. It is characterized by having a structure that bends from the inner surface of the main body to the inside of the hopper. Claim 4
In the invention described in the above, the powder delivery means is connected to the recovered powder transfer pipe upstream of the first opening / closing valve, and guides the powder in the hopper to the recovered powder transfer pipe. It is characterized by comprising a transfer intake pipe and a second opening / closing valve provided in the middle of the supply pipe and opened at the time of supply. According to a fifth aspect of the present invention, a gas containing powder is introduced into the container, and the powder separated from the gas falls into the container on the inner peripheral surface of the hopper portion made of a flexible material at the lower portion of the container. Then, the hopper is bent inward by applying a negative pressure to the inside of the container, and the powder collected and accumulated on the inner surface of the hopper is crushed and redeposited. It is characterized in that the powder in the hopper is sent out through a collected powder transfer pipe by sending means. The invention described in claim 6 transfers the powder accumulated in the hopper by repeating the negative pressure drawing, stopping the negative pressure drawing and sending out the powder in the hopper to the outside a plurality of times. It is characterized by the following.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a conceptual diagram showing a bag filter to which the powder collecting and transferring apparatus of the present invention is applied. In FIG. 1, reference numeral 1 denotes a container constituting the main body of the bag filter. The upper half is a cylindrical portion 1a, and the lower half is an inverted conical hopper main body 1b whose diameter decreases downward.
The lower end of the hopper body 1b is a small-diameter cylindrical portion 3 closed by a closing plate 2 serving as a bottom. The container 1 has a closed structure except for a gas-containing gas inlet for introducing gas containing dust (powder), which will be described later, and various plant facilities for generating gas containing dust and the like. And so on.

Further, reference numeral 4 denotes a container 1 in the cylindrical portion 1a.
A filter member, such as filter paper or filter cloth, which separates the inside into a lower primary chamber 5 and an upper secondary chamber 6, is air-tightly attached to the inner peripheral surface of the cylindrical portion 1a so as to be exchangeable as required. I have. The filter member 4 is formed in a zigzag, wavy or villous shape in the radial direction as a whole so that a sufficient filtration area can be obtained. In the drawing, the filter member 4 is shown as having three bent projections hanging downward.

Reference numeral 7 denotes a dust-containing gas inlet provided at a lower portion of the cylindrical portion 1a for introducing a gas containing dust and the like from the outside into the container 1, and has a diameter designed in advance. Have been. In addition, this diameter dimension or the opening degree of the powder-containing gas introduction port is involved in the in-vessel decompression operation described later. On the inner peripheral surface of the hopper body 1b, a film body 8 made of a tough cloth such as canvas is laid so as to cover substantially the entire inner peripheral surface. The upper and lower ends are hermetically fixed to the main body 1b. The hopper section is constituted by the hopper body 1b as a structural member and the film body 8 as a film for maintaining airtightness.

The film body 8 has a minute gap G formed between the film body 8 and the inner peripheral surface of the hopper body 1b except for the above-mentioned fixing portion. The hopper body 1b is provided with a slit or a small hole (both not shown).
The inside is always kept at the same pressure as the atmospheric pressure. That is, the film body 8 itself forms a part of the bag filter 1 and serves as a boundary between the inside (negative pressure part) of the bag filter 1 and the outside (atmospheric pressure part). As a result, when the dust (powder) is collected, the dust contacts the inner peripheral surface of the hopper body 1b over substantially the entire surface, and the dust is dropped and collected and deposited on the film body. In the negative evacuation step, the primary chamber 5 is evacuated by the blower 15.
The interior is decompressed compared to the atmospheric pressure, and operates so as to expand from the inner peripheral surface toward the primary chamber.

One end of a recovered powder transfer pipe 9 is connected to the small-diameter cylindrical portion 3 above the closing plate 2 and communicates with the inside of the hopper body 1b. A first opening / closing valve 10 is connected in the middle of the collected powder transfer pipe 9 to perform an opening operation (opening operation) when transferring the dust in the hopper body 1b. 11 is the first opening / closing valve 10
This is an air supply pipe having one end connected to the recovered powder transfer pipe 9 on the upstream side, and a second opening / closing valve 12 that is opened at the time of air supply is connected in the middle of the air supply pipe 11. The opening / closing valve 12 and the air supply pipe 11 constitute a powder delivery means P.

The first opening / closing valve 10 and the second opening / closing valve 12 are opened when the dust collected in the hopper body 1b is led to the outside through the collected powder transfer pipe 9, and the collected powder is opened. The inside of the transfer pipe 9 is pulled to a negative pressure, that is, the pressure is reduced, and the dust in the hopper body 1b is forcibly drawn into the collected powder transfer pipe 9. At this time, air accompanying dust is introduced from the air supply pipe 11, and the dust is pneumatically transported through the pipe 9 to a target location.

Therefore, in order to maintain the inside of the recovered powder transfer pipe 9 on the upstream side under reduced pressure suitable for powder transfer, the diameter and opening degree of the powder-containing gas introduction port, or the powder containing gas introduced thereinto The amount of air sucked from the air supply pipe 11 and the diameter of the recovered powder transfer pipe 9 are set to predetermined values with respect to the gas introduction pressure.

One end of an exhaust pipe 14 is connected to a top plate 13 that covers the upper end of the cylindrical portion 1 a constituting the container 1, and this is connected to the inside of the secondary chamber 6. A blower 15 is connected in the middle of the exhaust pipe 14. When the blower 15 is operated, the primary and secondary chambers are drawn to a negative pressure.

The opening and closing of the powder-containing gas inlet 7, the first opening and closing valve 10, and the second opening and closing valve 12 and the operation and non-operation of the blower 15 are controlled by a computer according to a predetermined program. It is repeatedly performed at a certain timing.

Next, the operation will be described. First, in the dust collection step, the dust-containing gas inlet 7 is opened under the control of the computer, the first opening / closing valve 10 and the second opening / closing valve 12 are closed, and the blower 15 starts driving. Is done. For this reason, a gas containing dust is introduced into the container 1 from the powder-containing gas introduction port 7, and a part of the powder directly falls onto the film body 8 in the hopper body 1b and is collected. The other part is drawn from the secondary chamber 6 above the primary chamber 5 which is under negative pressure by the blower 15, and is captured by the filter member 4 separating the primary chamber 5 and the secondary chamber 6. Only the gas (air) that has passed through the filter member 4 is discharged out of the container 1 via the exhaust pipe 14.

Following such a powder separation and recovery operation,
When transferring the powder captured in the hopper main body 1b and the filter member 4, first, the blower 15 is stopped to open or close the first opening / closing valve 10, and the second opening / closing valve 12 is closed. And By doing so, the dust trapped in the filter unit 4 is removed from the film body 8 in the hopper body 1b.
It accumulates on the top and starts preparation for the above-mentioned dust transfer.

That is, in this dust transfer preparation, the primary chamber 5 and the secondary chamber 6 are maintained at the same pressure with each other.
The powder captured by the filter member 4 falls into the hopper body 1b by its own weight, and expands into the hopper body 1b because the inner peripheral surface of the hopper body 1b has been depressurized compared with the atmospheric pressure. The released film body 8 returns to its original state.
Almost all of the dust that has adhered to the filter member 4 and has not separated is dropped and separated and falls down, and is collected and deposited on the film body 8 and the closing plate 2 in the hopper portion 10 because the suction to the negative pressure in the container 1 is eliminated. Will be done.

Next, following the transfer preparation, the first opening / closing valve 10 and the second opening / closing valve 12 are opened. As a result, the powder accumulated in the hopper is drawn into the collected powder transfer pipe 9 and collected. However, it is not possible to collect all of the accumulated powder by this alone, and only the vicinity of the connection port of the collected powder transfer pipe 9 to the hopper is collected.

Next, the first opening / closing valve 10 and the second opening / closing valve 12 are closed, the blower 15 is operated for a short time to perform a negative pressure reduction, and then stopped. Thus, the film body 8 is moved in the negative pressure drawing direction, that is, the hopper body 1 by the negative pressure drawing.
b expands inward. For this reason, due to the swelling of the film body 8, the dust accumulated in a layer on the film body 8 is again taken up into the primary chamber, and is again deposited below the hopper lb with the stop of the blower. It is also effective to repeat such an operation, that is, the negative pressure reduction and the stop thereof a plurality of times, to further ensure the fall of the accumulated dust. Thereafter, the first opening / closing valve 10 and the second opening / closing valve 12 are opened again to collect the powder. By repeating this operation, dust can be automatically collected.

As described above, when the gas containing dust is introduced into the container 1, only the dust is deposited on the film body 8 on the hopper portion lb.
The dust is collected and deposited on the top and the closing plate 2, and most of the dust can be transferred to the outside through the collected powder transfer pipe 9 by the floating operation of the film body. The collection of the dust in the container 1 and the transfer of the dust from the container 1 are performed by controlling the opening and closing of the first opening and closing valve 10 and the second opening and closing valve 12 by a computer and the operation of the blower 15 not to operate. By the selection switching as described above, the processing can be repeated alternately, and maintenance-free continuous processing of dust can be realized.

A plurality of bag filters having such a configuration can be used side by side in accordance with the amount of dust to be processed. By transferring the dust from the inside of the container 1 to each table, the efficiency of the dust processing of the entire dust processing system having a plurality of bag filters can be improved.

The technique of the present invention can of course be applied not only to the bag filter as shown in the embodiment, but also to various devices for accommodating powder. Further, in the above-described embodiment, the hopper portion having the structure in which the film body is provided on the inner surface of the hopper body as the structural member is used. However, the present invention is also applicable when the hopper body is omitted and the film body itself is used as the hopper portion. The technology of the invention can be applied. Further, the hopper main body does not necessarily need to be in the shape of a container, and may adopt, for example, a cage-like structure that covers the film body to support the load applied to the film body.
In short, any structure may be used as long as the internal negative pressure acts on the inside of the film body and the atmospheric pressure acts on the outside.

[0023]

As described above, according to the first aspect of the present invention, a container having a hopper for recovering powder separated from gas and a container laid on the inner peripheral surface of the hopper are provided. A film body that can be expanded toward the inside of the hopper by negative pressure in the container, and provided in the middle of a collected powder transfer pipe connected near the bottom of the hobber part, A first opening / closing valve for transferring powder which is opened when stopped; and a powder sending means for forcibly sending powder in the hopper portion into the recovered powder transferring pipe when the negative pressure is stopped. Therefore, by floating the film by negative pressure in the container, powder such as dust collected and deposited on the film can be easily disintegrated, and one after another near the outlet of the recovered powder transfer pipe. Without sending a bridge Bets can be, as a result hopper - there is an advantage that it streamlines the powder transfer section. According to the second aspect of the present invention, the hopper portion is formed of a flexible film body such as cloth or resin, and the film body has a structure that bends inward due to negative pressure. By bending the film, powder such as dust accumulated inside can be easily broken. According to the third aspect of the present invention, the hopper section includes a hopper section main body,
It is composed of a cloth laid on the inner surface thereof and a flexible film body such as a resin, and the film body has a structure that bends from the inner surface of the hopper main body to the inside of the hopper by negative pressure drawing. By bending the film covering the inner surface of the hopper, the powder such as dust accumulated inside can be easily disintegrated, and the hopper body protects the material on the inner surface as a structural member. Therefore, by using a relatively lightweight and inexpensive material for lining, an existing hopper can be easily modified and realized. According to the fourth aspect of the present invention, the pressure reducing means is connected to the recovered powder transfer pipe upstream of the first opening / closing valve to transfer the powder in the hopper to the recovered powder transfer pipe. Since it is composed of an air transfer supply pipe to be led out and a second opening / closing valve for supply provided in the middle of the supply pipe and opened at the time of supply,
By merely supplying air to the recovered powder transfer pipe through the air supply pipe, this becomes the accompanying air, and the effect that the powder in the hopper can be vigorously transferred to the outside of the container through the recovered powder transfer pipe is obtained. Can be According to the invention as set forth in claim 5, a gas containing powder is introduced into the container, and the powder separated from the gas is dropped and collected on the inner peripheral surface of the hopper at the lower portion of the container in the container. Subsequently, the hopper is bent inwardly by drawing a negative pressure in the container, and the powder collected and deposited on the hopper is crushed. Powder is sent to the outside through the recovered powder transfer pipe, so that the powder collected and deposited on the film laid in the hopper can be disintegrated with only a simple vacuuming operation inside the container. In addition, the effect of transferring the powder outside the container can be realized reliably and at low cost without requiring large-scale equipment. According to the sixth aspect of the present invention, since the negative pressure reduction and the stop thereof are repeated a plurality of times, an effect is obtained that the dust in the hopper can be more reliably collected.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram illustrating a powder collection and transfer device and a powder collection and transfer method according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container 1b Hopper body 4 Filter part 5 Primary chamber 6 Secondary chamber 8 Membrane 9 Recovered powder transfer pipe 10 First open / close valve 11 Air supply pipe 12 Second open / close valve 15 Blower P Powder delivery means

Claims (6)

[Claims] 1. A container having a hopper for accommodating powder, and a powder transfer device provided in the middle of a recovered powder transfer pipe connected near the bottom of the hopper and opened when the negative pressure is stopped. A first opening / closing valve, and powder sending means for forcibly sending the powder in the hopper into the recovered powder transfer pipe when the negative pressure is stopped. A powder recovery and transfer device, wherein at least a part of the device is configured to bend inward by negative pressure inside the container. 2. At least a part of the hopper section,
The powder recovery and transfer according to claim 1, wherein the film is a film body made of a flexible material such as cloth or resin, and the film body has a structure that bends inward by negative pressure. apparatus. 3. The hopper section comprises a hopper body and a film laid on the inner surface thereof and a film body made of a flexible material such as resin, and the film body is formed by negative pressure pulling. The powder recovery and transfer apparatus according to claim 1, further comprising a structure that bends from the inner surface of the hopper to the inside of the hopper. 4. The air sending means is connected to the recovered powder transfer pipe upstream of the first opening / closing valve, and guides the powder in the hopper to the recovered powder transfer pipe. A transfer suction pipe, a second pipe provided in the middle of the supply pipe and opened at the time of supply.
The powder recovery and transfer device according to any one of claims 1 to 3, further comprising: 5. A gas containing powder is introduced into a container, and the powder separated from the gas is dropped and collected on the inner peripheral surface of a flexible material hopper below the container in the container. Then, the hopper portion is bent inward by negatively drawing the pressure in the container, and the powder collected and deposited on the inner surface of the hopper portion is crushed and redeposited. A powder collection and transfer method, wherein the powder in the hopper is sent out through a collection powder transfer pipe. 6. The method according to claim 1, wherein the negative pressure reduction, the stopping of the negative pressure reduction, and the sending of the powder in the hopper to the outside are repeated a plurality of times to transfer the powder accumulated in the hopper. The method for recovering and transferring a powder according to claim 5, wherein