Classification device and dust solidification system

Abstract

The present invention provides a technology for properly separating foreign matter from dust. The classification device comprises: a hose that sucks dust containing fine dust and foreign matter from the front end; a main body that divides the classification space inside, the end of the hose is connected to the classification space in a manner that communicates with the classification space, an upper discharge port for connecting to a suction device that forms a negative pressure in the classification space is provided at the top, and a lower discharge port for discharging foreign matter that falls into the classification space is provided at the bottom; a cover member that is installed on a container that divides a storage space, the storage space stores foreign matter discharged from the lower discharge port of the main body, the cover member is formed with an air intake port that communicates with the storage space and is located below the main body; and an air introduction pipe that is connected to the air intake port of the cover member and is arranged in the storage space.

Description

Technical Field

[0001] The present disclosure relates to a classifying device and a dust solidification system. Background Art

[0002] Patent Document 1 discloses a device for solidifying wastes, which includes a hopper for storing wastes, a compression chamber provided below the hopper, and a compression unit for compressing the wastes from above and from the sides of the compression chamber to solidify the wastes.

[0003] Patent Document 1: Japanese Patent Application Laid-Open No. 04-123898

[0004] In the device described in Patent Document 1, when the waste is dust, abnormal operation may occur due to foreign matter mixed in the dust. The present disclosure provides a technology for appropriately separating foreign matter from dust. Summary of the invention

[0005] A classification device according to one aspect of the present disclosure comprises: a hose that sucks dust including fine dust and foreign matter from a front end; a main body that divides a classification space internally, to which a distal end of the hose is connected in a manner communicating with the classification space, an upper discharge port for connecting to a suction device that forms a negative pressure in the classification space being provided at an upper portion, and a lower discharge port for discharging foreign matter that has fallen into the classification space being provided at a lower portion; a cover member that is mounted on a container that divides a storage space, the storage space storing foreign matter discharged from the discharge port of the main body, the cover member being formed with an air inlet communicating with the storage space and being located below the main body; and an air introduction pipe that is connected to the air inlet of the cover member and is disposed in the storage space.

[0006] The dust solidification system according to another aspect of the present disclosure comprises a classification device and a solidification device, wherein the classification device comprises: a hose which sucks dust containing fine dust and foreign matter from the front end; a main body which divides a classification space internally, the end of the hose is connected to the main body in a manner communicating with the classification space, an upper discharge port is provided at the upper part for connecting to a suction device which forms a negative pressure in the classification space, and a lower discharge port is provided at the lower part for discharging foreign matter which falls into the classification space; a cover member which is installed on a container which divides a storage space, the storage space stores foreign matter discharged from the discharge port of the main body, the cover member is formed with an air inlet communicating with the storage space and is located below the main body; and an air introduction pipe which is connected to the air inlet of the cover member and is arranged in the storage space, the fine dust which has passed through the upper discharge port of the main body is put into the solidification device, and the fine dust is pressurized to form particles.

[0007] According to the present disclosure, foreign matter can be appropriately separated from dust. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1This is a diagram for explaining the outline of a dust solidification system according to one embodiment.

[0009] Figure 2 This is a side view showing an example of a classification device according to an embodiment and an example of a suction device connected to the classification device.

[0010] Figure 3 Yes means Figure 2 Figure 2 is an example of a coarse filter.

[0011] Figure 4 Yes means Figure 2 A perspective view of an example of a grading device.

[0012] Figure 5 Yes means Figure 2 A cross-sectional view of an example of a grading device.

[0013] Figure 6 Yes means Figure 2 A partial cross-sectional view of an example of a grading device.

[0014] Figure 7 It is a perspective view showing an example of an inspection cover and a filter.

[0015] Description of Reference Numerals

[0016] 1…classifying device; 2…curing device; 10…main body; 11…cover member; 11c…air inlet; 13…first hose (an example of a hose); 14…coarse filter; 15…inspection cover; 18…tube body; 19…air inlet pipe; 22…storage container (an example of a container); 23…suction device; 100…dust curing system. DETAILED DESCRIPTION

[0017] The embodiments of the present disclosure are described in detail with reference to the accompanying drawings. The same elements are marked with the same reference numerals in the description of the drawings, and repeated descriptions are omitted. The dimensional ratios of the drawings do not have to be consistent with the description. The terms "upper", "lower", "left" and "right" are based on the states shown in the drawings and are for convenience.

[0018] [An example of a dust solidification system]

[0019] A dust solidification system according to one embodiment is a system for solidifying dust collected in a factory, etc. Dust (dust) refers to powder that is fine enough to float in a gas, including smoke generated during laser processing, plasma processing, and welding of metal materials, etc. Solidification refers to compacting the powder.

[0020] Figure 1This is a diagram for explaining the outline of a dust solidification system according to one embodiment. A dust collector 20 is arranged in a factory or the like. The dust collector 20 takes in air to remove dust and releases purified air. The dust collector 20 collects the dust removed from the air in a dust collection container 21. The dust collection container 21 may be a box provided in the dust collector 20 or a barrel. Figure 1 The dust solidification system 100 shown solidifies the dust stored in the dust storage container 21 to form particles. In the present embodiment, the object obtained by solidifying the powder is called a particle.

[0021] like Figure 1 As shown, the dust solidification system 100 includes a classification device 1 and a solidification device 2. The classification device 1 is connected to the suction device 23 to suck the dust stored in the dust storage container 21. The classification device 1 classifies the sucked dust into foreign matter (coarse solid matter) and fine dust. Coarse solid matter is dust with a particle size of tens of μm to several mm, including spatter. Fine dust is dust with a particle size of 0.1 μm to several μm, including smoke. The classification device 1 can also not suck large foreign matter into the classification device 1 when sucking dust. The coarse solid matter classified by the classification device 1 is stored in the storage container 22 (an example of a container). The storage container 22 is, as an example, a barrel. The fine dust classified by the classification device 1 is stored in the input container 24 via the suction device 23. The input container 24 is, as an example, a barrel. The fine dust contained in the input container 24 is put into the solidification device 2. For example, when fine dust is introduced, an accessory connected to the introduction port of the solidification device 2 is installed on the introduction container 24. The solidification device 2 is connected to the introduction container 24 via the accessory, and fine dust is introduced into the solidification device 2. The solidification device 2 is a device that solidifies dust to form particles. The solidification device 2 pressurizes the fine dust to form particles. Compared with dust, particles are less likely to fly, so it is possible to reduce the exposure of workers to dust, and compared with the state of powder, the volume is smaller, so it is possible to reduce waste disposal costs.

[0022] [Overview of the Classification Device]

[0023] Figure 2 1 is a side view showing an example of a classification device according to an embodiment and an example of a suction device connected to the classification device. Figure 2As shown, the classification device 1 includes a main body 10 that divides the classification space inside, and a cover member 11 located below the main body 10. The main body 10 is, for example, roughly rectangular, and the cover member 11 is, for example, roughly disc-shaped. The lower part 10c of the main body 10 is supported by the cover member 11. Thus, the main body 10 is erected on the upper surface of the cover member 11. The cover member 11 is mounted on a storage container 22 for accommodating coarse solids. The storage container 22 is a roughly cylindrical barrel with an open upper portion. As described later, a lower discharge port is formed at the lower end of the main body 10, and passes through the cover member 11. Thus, the classification space divided inside the main body 10 is communicated with the interior of the storage container 22.

[0024] A suction port 10a is provided on the side of the main body 10, and the suction port 10a is used to take dust into the interior of the main body 10. The end 13b of the first hose 13 (an example of a hose) is connected to the suction port 10a. Thus, the interior of the main body 10 is connected to the first hose 13. The first hose 13 can be a flexible pipe formed of a resin or the like, or a hard pipe formed of a metal or the like. The first hose 13 sucks dust from the front end 13a. Dust includes fine dust and coarse solid matter.

[0025] An upper discharge port 10b is provided at the upper part of the main body 10, and the upper discharge port 10b is used to connect to the suction device 23 that forms a negative pressure in the classification space. A second hose 23a of the suction device 23 is connected to the upper discharge port 10b. Thus, the interior of the main body 10 is connected to the second hose 23a. The suction device 23 is a device that generates a suction force, and for example, has a fan and a motor. The suction device 23 can be detachably mounted on the input container 24, and the sucked fine dust is stored in the input container 24.

[0026] When the suction device 23 starts suction, the dust is sucked from the front end 13a of the first hose 13. The dust reaches the classification space divided inside the main body 10 from the suction port 10a. Then, the coarse solid matter contained in the dust passes through the lower part 10c of the main body 10 and the cover member 11 and is stored in the storage container 22. The fine dust contained in the dust passes through the upper discharge port 10b and the second hose 23a and is stored in the input container 24. In this way, the coarse solid matter contained in the dust is stored in the storage container 22, and the fine dust contained in the dust is stored in the input container 24.

[0027] In order to remove large foreign matter, a coarse filter 14 may be provided at the front end 13 a of the first hose 13 . Figure 3 Yes means Figure 2 Figure 1 shows an example of a coarse filter. Figure 3 As shown, the coarse filter 14 has a plurality of openings. The plurality of openings are respectively smaller than the opening of the first hose 13. Thus, the coarse filter 14 can prevent large foreign matter from being sucked into the interior of the classification device 1.

[0028] [Details of the classification device]

[0029] Figure 4 Yes means Figure 2 A perspective view of an example of a grading device. Figure 4 As shown, the main body 10 of the classification device 1 is mounted on the storage container 22 together with the cover member 11. For example, the cover member 11 is detachably mounted on the storage container 22 by three locking mechanisms 11a arranged at equal intervals in the circumferential direction. The connection portion between the cover member 11 and the storage container 22 is airtight. The locking mechanism 11a is, for example, a catch clip.

[0030] The cover member 11 is formed with an opening 11a through which the lower portion 10c of the main body 10 communicates. Thus, the staging space of the main body 10 communicates with the interior of the storage container 22. The cover member 11 is formed with an air intake port 11c that communicates with the interior of the storage container 22. The cover member 11 may also be provided with a window 11d that enables visual confirmation of the interior. The main body 10 may also be configured to be openable by an inspection cover 15. The inspection cover 15 constitutes a portion of the side wall opposite to the suction port 10a. The inspection cover 15 is detachably mounted on the main body 10 by a mounting member 15a.

[0031] Figure 5 Yes means Figure 2 A cross-sectional view of an example of a grading device. Figure 6 Yes means Figure 2 A partial cross-sectional view of an example of a grading device, showing the Figure 5 The cross section of the VI-VI line. Figure 5 and Figure 6 As shown, a classification space S1 is divided inside the main body 10. A filter 17 for separating fine dust from coarse solid matter may also be provided in the classification space S1. The filter 17 is arranged in the front stage of the upper discharge port 10b. The coarse solid matter that does not fall but moves toward the upper part of the main body 10 along with the air flow is removed by the filter 17.

[0032] The lower portion 10c of the main body 10 is composed of a tube body 18. The tube body 18 is, for example, a cylindrical body with a rectangular cross section. The tube body 18 may be a straight tube. The tube body 18 has a cross-sectional area smaller than the cross-sectional area of ​​the center of the main body 10 (for example, the cross-sectional area through the suction port 10a). The lower end of the tube body 18 forms a lower discharge port 18c. Thus, the coarse solid matter falling in the classification space S1 is discharged from the lower discharge port 18c and stored in the storage space S2 divided inside the storage container 22.

[0033] The air inlet 11c formed in the cover member 11 is connected to the air inlet 11c. The air inlet 19 is, for example, a cylinder. The air inlet 19 is disposed in the storage space S2. The air inlet 19 may be connected to the air inlet 11c of the cover member 11 with its lower end facing the bottom of the storage container 22.

[0034] By the action of the suction device 23, the classification space S1 becomes a negative pressure. As a result, an airflow R1 is generated from the front end 13a of the first hose 13 toward the classification space S1 of the main body 10. The airflow R1 collides with the inspection cover 15 to become an ascending airflow R2, and becomes an airflow R3 discharged from the upper discharge port 10b. The dust sucked by the airflow R1 collides with the inspection cover 15. The fine dust contained in the dust is transported to the upper discharge port 10b of the main body 10 along with the airflow R2. The coarse solid matter contained in the dust falls to the lower part 10c of the main body 10 due to gravity, passes through the tube body 18, and is discharged from the lower discharge port 18c. Fine dust sometimes adheres to coarse solid matter. Therefore, fine dust sometimes falls together with coarse solid matter and reaches the storage space S2.

[0035] Since the storage space S2 is connected to the classification space S1, it becomes a negative pressure. As a result, air is taken in from the air intake port 11c of the cover member 11. The air passes through the air inlet pipe 19 as the airflow R4 and is introduced into the storage space S2. The air introduced from the air inlet pipe 19 reaches the bottom of the storage container 22 as shown by the airflow R5, and hits the stored coarse solids. The fine dust attached to the coarse solids is scattered in the storage space S2 through the airflow R5. Then, an airflow toward the lower discharge port 18c of the main body 10 is generated like the airflow R5. The fine dust scattered in the storage space S2 is transported from the lower discharge port 18c of the main body 10 to the classification space S1 along with the rising airflow R6, and then transported to the upper discharge port 10b of the main body 10 along with the airflow.

[0036] In this way, the classifying device 1 can further remove fine dust from the coarse solid matter classified and stored with the dust. Thus, the classifying device 1 can appropriately separate foreign matter from the dust. When the coarse solid matter is discarded from the storage container 22, the scattering of fine dust can also be suppressed.

[0037] In addition, the lower portion 10c of the main body 10 is composed of a tube body 18, thereby appropriately maintaining the rising airflow R6 from the storage space S2 toward the classification space S1 inside the tube body 18. If the flow rate of the rising airflow R6 is too fast, there is a concern that the coarse solid matter falling from the classification space S1 due to gravity will be pushed back. If the flow rate of the rising airflow R6 is too slow, not only will the fine dust not be transported from the storage space S2 to the classification space S1, but there is also a concern that the fine dust will be introduced into the storage space S2.

[0038] By adjusting the diameter of the air inlet pipe 19, that is, the cross-sectional area of ​​the air intake 11c, the air intake amount can be changed. In this way, the flow rate of the rising airflow R6 can be adjusted. For example, the flow rate of the rising airflow R6 in the tube body 18 can set the terminal settling velocity that can cause dust with a particle size of about several μm to rise to a lower limit. In this case, it is possible to suppress the fine dust from being introduced into the storage space S2. For example, the lower limit of the flow rate of the rising airflow R6 can be set to 0.01 m / s (terminal settling velocity corresponding to dust with a particle size of about several μm). The flow rate of the rising airflow R6 can also be set to 0.4 m / s to 2.0 m / s (terminal settling velocity corresponding to dust with a particle size of about 40 μm to 100 μm).

[0039] The flow rate of the rising airflow R6 can also be changed by adjusting the cross-sectional area of ​​the tube 18. For example, the air volume Q (m 3 / min) can be expressed as the cross-sectional area A (m 2 )×flow velocity V (m / s) in tube 18×60 (s / min). The air volume Q depends on the diameter of air inlet tube 19. Therefore, under the condition of constant air volume Q, if the cross-sectional area A of tube 18 is changed, the flow velocity of tube 18 changes inversely. Therefore, the above range can also be achieved by adjusting the cross-sectional area of ​​tube 18.

[0040] The length of the tube body 18 and the air introduction tube 19 can be appropriately set, for example, it can also be set to about 20% to 80% of the depth of the storage space S2. When the length of the air introduction tube 19 is too short (for example, less than 20% of the depth of the storage space S2), the distance from the lower end of the air introduction tube 19 to the bottom of the storage space S2 becomes longer, so the air descending from the air introduction tube 19 diffuses and attenuates before reaching the bottom of the storage space S2, and there is a concern that the rolling effect of the fine dust introduced into the bottom of the storage space S2 is weakened. When the length of the air introduction tube 19 is too long (more than 80% of the depth of the storage space S2), there is a concern that coarse solids will immediately fill the lower end of the air introduction tube 19. If the air introduction tube 19 is buried in coarse solids, the air intake amount is reduced, and the rising airflow R6 generated in the tube body 18 is weakened, so that fine dust is easy to fall, and there is a concern that fine dust is easy to be introduced into the storage space S2.

[0041] When the length of the tube body 18 is too short (for example, less than 20 mm), there is a concern that the rising airflow R6 generated in the tube body 18 will be weakened, and fine dust will easily fall, and there is a concern that fine dust will be easily introduced into the storage space S2. When the length of the tube body 18 is too long (more than 80% of the depth of the storage space S2), there is a concern that coarse solids will immediately fill the lower end of the tube body 18. When the lower end of the tube body 18 is buried, even if the smoke introduced into the storage space S2 is rolled up, there is no way out, so there is a concern that the effect of rolling up the fine dust will disappear. In addition, if the lower end of the tube body 18 is buried, the air inlet becomes narrower, and the flow rate increases, so there is a concern that coarse solids will also be rolled up.

[0042] Based on the above reasons, the lengths of the tube body 18 and the air introduction tube 19 are set to be approximately 20% to 80% of the depth of the storage space S2.

[0043] The inspection cover 15 may also support a filter 17 . Figure 7 15 is a perspective view showing an example of an inspection cover and a filter. The filter 17 has a frame 17a and a wire mesh 17b supported by the frame 17a. The mesh of the wire mesh 17b is larger than that of fine dust and smaller than that of coarse solid matter. The end of the filter 17 is fixedly supported by the inspection cover 15. Thus, the filter 17 can be easily taken out from the classification space S1 by removing the inspection cover 15 from the main body 10.

[0044] [Summary of Implementation Methods]

[0045] According to the classification device 1, the fine dust attached to the coarse solid matter stored in the storage container 22 can be scattered in the storage space S2 using the air introduced from the air introduction pipe 19. The fine dust scattered in the storage space S2 is transported from the lower discharge port 18c of the main body 10 to the classification space S1 along with the rising airflow R6, and is further transported to the upper discharge port 10b of the main body 10 along with the airflow R2. In this way, the classification device 1 can further remove the fine dust from the coarse solid matter classified and stored with the dust. Thus, the classification device 1 can appropriately separate foreign matter from the dust.

[0046] Various exemplary embodiments have been described above, but the present invention is not limited to the exemplary embodiments described above, and various omissions, substitutions, and changes may be made.

[0047] The tube body 18 may be integrally formed with the main body 10, or may be separately formed and connected to the main body 10. The lower end of the air introduction tube 19 may not be directed toward the bottom of the storage container 22. The storage container 22 and the input container 24 may also be circulated as consumables. The suction device 23 is not limited to the suction device 23 of the embodiment, and may be applicable to all devices having a suction function.

[0048] [Overview of Embodiments of the Present Disclosure]

[0049] The present disclosure includes the following aspects.

[0050] (Item 1) A classification device according to one aspect of the present disclosure comprises: a hose that sucks dust including fine dust and foreign matter from a front end; a main body that divides a classification space internally, to which the end of the hose is connected in a manner that communicates with the classification space, an upper discharge port that is provided at the upper portion for connecting to a suction device that forms a negative pressure in the classification space, and a lower discharge port that discharges foreign matter that has fallen into the classification space; a cover member that is mounted on a container that divides a storage space, the storage space storing foreign matter discharged from the lower discharge port of the main body, the cover member having an air inlet that communicates with the storage space and located below the main body; and an air introduction pipe that is connected to the air inlet of the cover member and is disposed in the storage space.

[0051] In the classification device, a suction device is connected to the upper discharge port of the main body. The suction device sucks the air in the classification space, whereby the classification space becomes a negative pressure. As a result, an airflow is generated from the front end of the hose toward the classification space of the main body. Through the airflow, dust containing fine dust and foreign matter is sucked from the front end of the hose and introduced into the classification space of the main body. Then, in the classification space, an airflow toward the upper discharge port of the main body is generated. In the classification space, fine dust contained in the dust is transported to the upper discharge port of the main body along with the airflow, and foreign matter contained in the dust falls to the bottom of the main body due to gravity. Foreign matter falls from the lower discharge port of the main body to the storage space of the container and is stored.

[0052] The storage space is connected to the classification space via the lower discharge port, so that a negative pressure is formed. Thus, air is taken in from the air intake port of the cover member. The air is introduced into the storage space through the air introduction pipe. The air introduced from the air introduction pipe hits the foreign matter stored in the container, causing the fine dust attached to the foreign matter to fly in the storage space. In the storage space, an airflow toward the lower discharge port of the main body is generated. The fine dust scattered in the storage space is transported from the lower discharge port of the main body to the classification space along with the airflow, and is further transported to the upper discharge port of the main body along with the airflow.

[0053] In this way, the classifying device can further remove fine dust from the foreign matter classified and stored with the dust. Therefore, the classifying device can appropriately separate the foreign matter from the dust.

[0054] (Item 2)

[0055] In the classification device described in item 1, the air introduction pipe may be connected to the air inlet of the cover member in such a manner that the lower end thereof faces the bottom of the container. In this case, the air is introduced toward the bottom of the container. The introduced air is reversed at the bottom of the container and rises, so the air introduction pipe can efficiently disperse the fine dust attached to the foreign matter in the storage space.

[0056] (Item 3)

[0057] In the classification device described in item 1 or 2, the lower part of the main body may be constituted by a tube body, the tube body having a cross-sectional area smaller than the cross-sectional area of ​​the center of the main body, and the lower end of the tube body constituting a lower discharge port. Thus, an upward airflow from the storage space toward the classification space is appropriately maintained inside the tube body. Thus, even when fine dust is separated from foreign matter during the falling process of foreign matter, and when fine dust moves downward due to the inertial force generated when the dust is introduced into the classification space, the fine dust can be prevented from falling into the storage space because the upward airflow transports the fine dust upward.

[0058] (Item 4)

[0059] The classification device described in any one of items 1 to 3 may also include a coarse filter, which is provided at the front end of the hose and has a plurality of openings. The plurality of openings are respectively smaller than the opening of the hose, so that the classification device can avoid sucking in foreign matter larger than the size of each of the plurality of openings.

[0060] (Item 5)

[0061] The classification device described in any one of items 1 to 4 may also include: a detachable inspection cover constituting a part of the side wall of the main body; and a filter, which is arranged in the front stage of the upper discharge port provided in the upper part of the main body and supported by the inspection cover, to separate fine dust from foreign matter. Foreign matter that does not fall but moves toward the upper part of the main body with the air flow is removed by the filter. The filter can be easily removed from the classification space by removing the inspection cover from the main body. Therefore, the load of cleaning the filter can be reduced.

[0062] (Item 6)

[0063] Another aspect of the present disclosure is a dust solidification system comprising a classification device and a solidification device, wherein the classification device comprises: a hose that sucks dust containing fine dust and foreign matter from the front end; a main body that divides a classification space internally, and is connected to the end of the hose in a manner that is connected to the classification space, an upper discharge port is provided at the upper part for connecting to a suction device that forms a negative pressure in the classification space, and a lower discharge port is provided at the lower part for discharging foreign matter that has fallen into the classification space; a cover member that is connected to a container that divides a storage space, and the storage space stores foreign matter discharged from the lower discharge port of the main body, the cover member is formed with an air inlet that is connected to the storage space, and is located below the main body; and an air introduction pipe that is connected to the air inlet of the cover member and is arranged in the storage space, the fine dust that has passed through the upper discharge port of the main body is input into the solidification device, and the fine dust is pressurized to form particles.

[0064] In this dust solidification system, the same effect as the above-mentioned classification device is achieved. In addition, in this dust solidification system, foreign matter is removed from the dust, and fine dust is put into the solidification device. Therefore, it is possible to reduce malfunction of the solidification device. In addition, the formability of the particles becomes good.

Claims

1. A classification device, characterized in that: have: A hose that sucks dust including fine dust and foreign matter from a front end; A main body, wherein the main body divides a grading space inside, and the end of the hose is connected to the grading space in a manner of being communicated with the grading space, and the main body is provided with an upper discharge port at the upper part for connecting to a suction device for forming a negative pressure in the grading space, and a lower discharge port at the lower part for discharging the foreign matter falling in the grading space; a cover member, the cover member being mounted on a container that divides a storage space, the storage space storing the foreign matter discharged from the lower discharge port of the main body, the cover member being formed with an air intake port communicating with the storage space and being located below the main body; as well as An air introduction pipe is connected to the air intake port of the cover member and is arranged in the storage space.

2. The classification device according to claim 1, characterized in that The air introduction pipe is connected to the air intake port of the cover member such that the lower end thereof faces the bottom of the container.

3. The classification device according to claim 1 or 2, characterized in that: The lower portion of the main body is formed of a tube having a cross-sectional area smaller than a cross-sectional area at the center of the main body, and the lower end of the tube forms the lower discharge port.

4. The classification device according to any one of claims 1 to 3, characterized in that: A coarse filter is provided, the coarse filter is arranged at the front end of the hose and has a plurality of openings, and the plurality of openings are respectively smaller than the opening of the hose.

5. The classification device according to any one of claims 1 to 4, characterized in that: have: A detachable inspection cover, the inspection cover constituting a part of the side wall of the main body; and A filter is arranged at a front stage of the upper discharge port provided at the upper portion of the main body and supported by the inspection cover to separate the fine dust from the foreign matter.

6. A dust solidification system, comprising a classification device and a solidification device, wherein the dust solidification system is characterized in that: The grading device comprises: A hose that sucks dust including fine dust and foreign matter from a front end; A main body, wherein the main body divides a grading space inside, and the end of the hose is connected to the grading space in a manner of being communicated with the grading space, and the main body is provided with an upper discharge port at the upper part for connecting to a suction device for forming a negative pressure in the grading space, and a lower discharge port at the lower part for discharging the foreign matter falling in the grading space; a cover member mounted on a container that partitions a storage space for storing the foreign matter discharged from the lower discharge port of the main body, the cover member having an air intake port communicating with the storage space and located below the main body; and an air introduction pipe connected to the air intake port of the cover member and arranged in the storage space, The solidifying device is loaded with the fine dust having passed through the upper discharge port of the main body, and pressurizes the fine dust to form particles.

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