Air dispersion member and dry separation device

Abstract

To provide an air dispersion member which is formed by sandwiching a sheet-like filter medium between two porous plates and makes variations in a flow rate or flow velocity of air passing therethrough less likely to occur.SOLUTION: An air dispersion member 4 is formed by sandwiching a sheet-shaped filter medium 42 between two porous plates 41. The air dispersion member 4 is provided with bolts 44 and nuts 45 that bind the two porous plates 41 to each other and apply surface pressure to the filter medium 42 sandwiched between the two porous plates 41.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an air distribution member and a dry separation device. [Background technology]

[0002] There is known a dry separation device that separates a processing object, which is composed of a mixture of multiple types of powders and granules with different densities, into individual components by utilizing the density differences among the components. For example, Patent Documents 1 and 2 describe a dry separation device that includes a fluidized bed and an air chamber disposed adjacent to and below the fluidized bed.

[0003] Furthermore, the dry separation devices described in Patent Documents 1 and 2 are equipped with a vibration means for vibrating the fluidized bed, and the fluidized bed is vibrated. When the fluidized bed is vibrated, the particles of the powder or granular material to be processed are vibrated. When the particles of the powder or granular material are vibrated, the fluidity of the particles of the powder or granular material increases, thereby facilitating separation of the material to be processed.

[0004] In these dry separation devices, an air dispersion member is placed between the air chamber and the fluidization tank to separate them. The material to be treated is placed in the fluidization tank, and pressurized air is supplied to the air chamber from the outside. The air supplied to the air chamber passes through the air dispersion member and flows into the fluidization tank. The material to be treated in the fluidization tank then flows within the fluidization tank due to the action of the air flowing in from the air chamber.

[0005] When the material to be treated in the fluidization tank flows within the fluidization tank, components of the material with lower density move to higher positions within the fluidization tank. Components with higher density move to lower positions within the fluidization tank. The fluidization tank is also equipped with multiple discharge ports, which are arranged in the height direction of the fluidization tank. Therefore, components with lower density are discharged from the discharge ports located at higher positions within the fluidization tank, and components with higher density are discharged from the discharge ports located at lower positions. In a dry separation device, the material to be treated is separated through roughly the above process.

[0006] The air dispersion member provided in the dry separation device is a planar member that distributes the air flowing from the air chamber to the fluidization tank so that the air flows evenly throughout the fluidization tank. Generally, sheet-like filter media such as nonwoven fabrics are used as air dispersion members, but sheet-like filter media alone lack mechanical strength, resulting in the problem of time-consuming maintenance. To solve this problem, the dry separation device described in Patent Document 2 uses a metal perforated plate, commonly called a punched metal, as a reinforcing member to compensate for the lack of strength of the sheet-like filter media. More specifically, in the dry separation device described in Patent Document 2, the air dispersion member is a sheet-like filter media sandwiched between two perforated plates. In this air dispersion member, the two perforated plates and the filter media are mechanically integrated, making the air dispersion member easy to handle. This facilitates the manufacture and maintenance of the dry separation device. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-168556 [Patent Document 2] Japanese Patent Publication No. 2021-171668 Summary of the Invention [Problem to be solved by the invention]

[0008] However, since perforated plates are generally manufactured through punching, some distortion remains in the out-of-plane direction. Therefore, when a sheet-like filter material is sandwiched between two perforated plates, a small but irregular gap occurs between the perforated plate and the sheet-like filter material. Therefore, a part of the air that flows between the two perforated plates may flow through this gap to an unexpected location. As a result, the flow rate or flow velocity of the air blown out from the opposite side of the air dispersion element may be uneven. In other words, the flow rate or flow velocity of the air blown out from the opposite side of the air dispersion element may differ for each small hole. In short, the flow rate or flow velocity of the air flowing out of the air dispersion element toward the fluidization tank may be large or small depending on the location of the air dispersion element.

[0009] If the flow rate or velocity of the air flowing out of the air dispersion member is uneven, the powder and granular material will rise in some areas of the fluidized bed and fall in others. This causes the powder and granular material to move up and down irregularly within the fluidized bed. As a result, at a certain height within the fluidized bed, an unacceptable level of mixing of multiple types of powder and granular material with different densities occurs. This causes the problem of multiple types of powder and granular material being discharged from a specific outlet. This reduces the separation accuracy of the dry separation device, resulting in the inability to adequately separate the materials being processed.

[0010] According to the research of the present inventors, the above phenomenon is more pronounced when the vibration means is operated to vibrate the fluidized bed. In other words, when the vibration means is operated to promote separation of the materials to be treated, the separation accuracy of the dry separation device is significantly reduced, resulting in the problem that the materials to be treated cannot be sufficiently separated.

[0011] The present invention has been made in consideration of the above circumstances, and aims to provide an air dispersion element that is composed of two perforated plates with a sheet-like filter material sandwiched between them, and that is less likely to cause variations in the flow rate or flow velocity of the air passing through.

[0012] Another object of the present invention is to provide a dry separation device that is less susceptible to deterioration in separation accuracy due to variations in the flow rate or flow velocity of air passing through an air dispersion member. [Means for solving the problem]

[0013] In order to achieve the above object, the air dispersion member according to the present invention comprises: An air dispersion member is provided at the boundary between the fluidization tank and the air chamber of a dry separation device, the air dispersion member separating the fluidization tank and the air chamber ... In an air dispersion member configured by sandwiching a sheet-like filter material between two perforated plates, located at a position away from the periphery of the air dispersion member, Two perforated plates are fastened together to form a Correct the out-of-plane distortion of It is provided with a fastening means.

[0014] The air dispersion member according to the present invention may comprise a plurality of fastening means.

[0015] In the planar shape of the air dispersion member, the plurality of fastening means may be arranged in a lattice pattern.

[0016] The fastening means may be a bolt inserted into a through-hole passing through the air dispersion member and a nut screwed onto the bolt.

[0017] The fastening means may be a rivet inserted into a through hole passing through the air dispersion member.

[0018] The fastening means may be a pin that is inserted into a through hole that penetrates the air dispersion member and has both ends welded to the perforated plate for fixation.

[0019] The fastening means may be a linear member that stitches the two perforated plates together.

[0020] A dry separation apparatus according to a first aspect of the present invention comprises a fluidized bed into which a material to be treated is fed, an air chamber located below and adjacent to the fluidized bed and into which pressurized air is supplied from the outside, and any of the air dispersion members described above located at the boundary between the fluidized bed and the air chamber to separate them.

[0021] A dry separation apparatus according to a second aspect of the present invention comprises a fluidized bed into which a material to be treated is introduced, an air chamber located below and adjacent to the fluidized bed and into which pressurized air is supplied from the outside, and a flat air dispersion member formed by sandwiching a sheet-like filter medium between two perforated plates, the air dispersion member being disposed at the boundary between the fluidized bed and the air chamber to separate them and dispersing air flowing from the air chamber into the fluidized bed, It is placed inside the fluidized bed, an upper contact member fixed to the fluidization vessel and contacting the upper surface of the air dispersion member at a position away from the periphery of the fluidization vessel; and a lower contact member located directly below the upper contact member, Located inside the air chamber, and a lower contact member fixed to the air chamber and contacting the lower surface of the air dispersion member at a position spaced from the periphery of the air chamber. [Effects of the Invention]

[0022] The air dispersion member according to the present invention comprises: located at a position away from the periphery of the air dispersion member, The two perforated plates are fastened together to form a Correcting out-of-plane distortion The fastening means eliminates irregular gaps between the perforated plate and the sheet-like filter material, even if they are caused by out-of-plane distortion remaining in the perforated plate. As a result, the flow rate or velocity of the air flowing into the fluidization tank through the air dispersion member is prevented from becoming uneven.

[0023] The dry separation apparatus according to the first aspect of the present invention includes the air dispersion member, which prevents imbalances in the flow rate or flow velocity of the air flowing into the fluidized bed, thereby improving the separation accuracy of the material to be treated by the dry separation apparatus.

[0024] The dry separation apparatus according to the second aspect of the present invention includes an upper contact member and a lower contact member, and an air dispersion member is sandwiched between the upper and lower contact members. Therefore, even if irregular gaps occur between the perforated plate and the sheet-like filter medium due to out-of-plane distortion remaining in the perforated plate, the gaps are eliminated. As a result, the occurrence of bias in the flow rate or flow velocity of the air flowing into the fluidized bed through the air dispersion member is suppressed. Therefore, the separation accuracy of the material to be treated by the dry separation apparatus is improved. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a side cross-sectional view showing the overall configuration of a dry separation device according to an embodiment of the present invention. [Figure 2] 1A is a perspective view of an air dispersion member provided in the dry separation apparatus shown in Fig. 1, and Fig. 1B is an arrow view of the air dispersion member as seen from the direction indicated by arrow B in Fig. 1A, showing an enlarged view of a portion of the air dispersion member. Fig. 1C is a cross-sectional view of the air dispersion member taken along the plane indicated by line CC' in Fig. 1B. [Figure 3] 2(A) to 2(D) are partial cross-sectional views showing other examples of fastening means provided in the air dispersion member provided in the dry separation apparatus shown in FIG. 1, following FIG. 2(C). [Figure 4] FIG. 1A is a side cross-sectional view showing another example of the configuration of a dry separation device according to the present invention, and FIG. 1B is a cross-sectional view of the dry separation device shown in FIG. 1A taken along the plane indicated by line BB' in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0026] The configuration and operation of a dry separation apparatus according to an embodiment of the present invention and an air dispersion member provided in the dry separation apparatus will be described in detail below with reference to the drawings. Note that the same reference numerals are used in each drawing to designate the same or equivalent parts.

[0027] (Overall composition) Fig. 1 is a side cross-sectional view showing the configuration of a dry separation apparatus 1 according to an embodiment of the present invention. As shown in Fig. 1, the dry separation apparatus 1 includes a fluidization tank 2, an air chamber 3 below and adjacent to the fluidization tank 2, and an air dispersion member 4 disposed at the boundary between the fluidization tank 2 and the air chamber 3 to separate them.

[0028] As will be described later, the material to be treated, which is a mixture of powders and granular materials of different densities, is introduced into the fluidization tank 2. High-pressure air is supplied to the air chamber 3 from a high-pressure air source (not shown). The high-pressure air supplied to the air chamber 3 passes through the air dispersion member 4 and flows into the fluidization tank 2. As a result, the material to be treated introduced into the fluidization tank 2 flows within the fluidization tank 2. As the material flows within the fluidization tank 2, components with lower densities move to higher positions within the fluidization tank 2. Components with higher densities move to lower positions within the fluidization tank 2. As a result, the material to be treated is separated into components with lower and higher densities within the fluidization tank 2.

[0029] As shown in Figure 1, fluidization tank 2 has an inlet 5 and an outlet 6. The material to be treated is introduced into fluidization tank 2 through inlet 5. Two outlets 6 are located in the fluidization tank 2, one at the top and one at the bottom. The outlet 6, located at a higher position in the fluidization tank 2, discharges low-density constituents of the material to be treated, while the outlet 6, located at a lower position in the fluidization tank 2, discharges high-density constituents of the material to be treated. An exhaust outlet 7 is located at the top of the fluidization tank 2. Excess air that does not flow out through the outlet 6 is exhausted to the outside through the exhaust outlet 7. A filter 8 is attached to the exhaust outlet 7, and fine particles contained in the air exhausted to the outside through the exhaust outlet 7 are captured and removed by the filter.

[0030] As shown in FIG. 1 , the dry separation apparatus 1 includes two vibrators 9. Each vibrator 9 includes a rotary motor (not shown) and an eccentric disk driven by the rotary motor. The two vibrators 9 are synchronized and rotate in opposite directions. The direction of the vibration force can be changed by changing the phase difference between the rotation angles of the two vibrators 9. The vibration frequency can be changed by changing the rotation speed of the two vibrators 9. Alternatively, the magnitude of the vibration force can be changed by changing the eccentricity of the eccentric disk. In other words, by changing or adjusting the settings of the vibrators 9, the dry separation apparatus 1 can be vibrated at any frequency, with any vibration force, and in any direction. In this way, the vibrator 9 functions as a vibration means that vibrates the dry separation apparatus 1 at any frequency, with any vibration force, and in any direction.

[0031] (Air dispersion member) Fig. 2(A) is a perspective view of the air dispersion member 4 provided in the dry separation apparatus 1, and Fig. 2(B) is an arrow view of the air dispersion member 4 as seen from the direction indicated by arrow B in Fig. 2(A), showing an enlarged view of a portion of the air dispersion member. Fig. 2(C) is a cross-sectional view of the air dispersion member taken along the plane indicated by line CC' in Fig. 2(B).

[0032] The air dispersion member 4 is a flat plate-like member as shown in FIG. 2(A) and is composed of a sheet-like filter material 42 sandwiched between two perforated plates 41 as shown in FIG. 2(C). The perforated plate 41 is a flat metal plate with numerous small holes 43. The perforated plate 41 is manufactured by pressing a metal plate and is generally called punched metal. The size of the small holes 43 is not particularly limited, but is generally selected from a diameter range of 1 mm to 10 mm. The number of small holes 43 in the perforated plate 41 is determined through calculation or experimentation to ensure sufficient fluidity of the material to be treated. The filter material 42 is a member that distributes the air flowing from the air chamber 3 into the fluidization tank 2 throughout the fluidization tank 2. The mesh size of the filter material 42 is selected to achieve the desired dispersion effect. In many cases, woven fabric, nonwoven fabric, or paper, i.e., a fibrous material, is selected for the filter material 42, but a fine-mesh wire mesh may also be used.

[0033] As shown in Figures 2(A) and 2(B), the air dispersion member 4 has a plurality of through-holes formed therethrough, and a bolt 44 is inserted into each of the plurality of through-holes. As shown in Figure 2(A), the plurality of bolts 44 are arranged in a grid pattern over a wide area of ​​the planar shape of the air dispersion member 4, excluding the peripheral edge. As shown in Figure 2(C), two nuts 45, 45 are threaded onto the bolt 44, forming a so-called double nut. A washer 46 is sandwiched between the nut 45 and the air dispersion member 4.

[0034] In the configuration shown in Fig. 2(C), when the nuts 45 are tightened, the air dispersion member 4 is sandwiched and compressed between the bolts 44 and nuts 45. As a result, the two perforated plates 41 constituting the air dispersion member 4 are fastened together. In other words, the bolts 44 and nuts 45 function as fastening means for fastening the two perforated plates 41 together. Furthermore, by fastening the two perforated plates 41 together, a surface pressure acts on the filter medium 42.

[0035] In this way, by providing the air dispersion member 4 with the bolts 44 and nuts 45, that is, by providing a fastening means, the two perforated plates 41 are fastened together. Therefore, even if the perforated plates 41 have some distortion in the out-of-plane direction, the distortion is corrected. Furthermore, since the filter medium 42 receives a surface pressure from the perforated plates 41, the filter medium 42 is in close contact with the perforated plates 41. As a result, the small gaps that existed between the perforated plates 41 and the filter medium 42 are almost completely eliminated.

[0036] When the small gaps between the perforated plates 41 and the filter medium 42 are almost completely eliminated, air that flows into the air dispersion member 4 through the small holes 43 in one perforated plate 41 flows through the gaps and no longer flows out from small holes 43 in unexpected locations on the opposite perforated plate 41. As a result, the flow rate or flow speed of air flowing out from the opposite perforated plate 41 does not vary depending on the location, so air that flows into the air dispersion member 4 through the small holes 43 in one perforated plate 41 flows out from small holes 43 in the opposite perforated plate 41 that are directly behind the original small holes 43. Therefore, air that flows in from one side of the air dispersion member 4 flows out evenly on the opposite side of the air dispersion member 4.

[0037] Because the air dispersion member 4 functions as described above, when the dry separation apparatus 1 is equipped with this air dispersion member 4, the air that flows into the fluidized bed 2 through the air dispersion member 4 flows evenly and rises in the fluidized bed 2. As a result, the powder and granular material to be processed that is introduced into the fluidized bed 2 is distributed in layers according to its density. That is, powder and granular material with low density is distributed in the upper layer of the fluidized bed 2, and powder and granular material with high density is distributed in the lower layer of the fluidized bed 2, preventing powder and granular material with different densities from being mixed at the same height within the fluidized bed 2. As a result, the separation accuracy of the dry separation apparatus 1 is improved. That is, the uniformity of the powder and granular material discharged through each of the discharge ports 6 is improved.

[0038] Furthermore, since the air dispersion member 4 is configured by sandwiching the filter medium 42 between two perforated plates 41, the filter medium 42 is stably held by the perforated plates 41. In other words, the filter medium 42 is less likely to fall off. Furthermore, since the powder and granular material is less likely to come into direct contact with the filter medium 42, the filter medium 42 is less likely to be worn. In this way, the air dispersion member 4 also has excellent mechanical durability.

[0039] (Another example of fastening means) The fastening means provided in the air dispersion member 4 are not limited to the bolts 44 and nuts 45. The fastening means can be variously modified as long as it can fasten the two perforated plates 41 constituting the air dispersion member 4 together and apply surface pressure to the filter medium 42. For example, as shown in FIG. 3(A), a rivet 47 may be inserted into the air dispersion member 4, and the tip of the rivet 47 protruding from the opposite surface of the air dispersion member 4 may be crimped. In this case, the rivet 47 functions as the fastening means. Alternatively, as shown in FIG. 3(B), instead of the rivet 47, a pin 48 may be inserted into the air dispersion member 4 and fixed by welding the pin 48 to the perforated plate 41. In this case, the influence of heat generated during welding becomes a problem, but this does not pose any particular problem when a fine-mesh wire mesh is used as the filter medium 42. 3(C), an adhesive 49 may be impregnated into a portion of the filter medium 42, and the two porous plates 41 may be bonded together by the adhesive 49. In this case, the adhesive 49 functions as a fastening means.

[0040] Alternatively, as shown in FIG. 3(D), two perforated plates 41 may be bound together with an upper thread 50 and a lower thread 51. In this case, the upper thread 50 and the lower thread 51 function as binding means. In the configuration shown in FIG. 4, the upper thread 50 and the lower thread 51 are sufficient as long as they are linear members that function in the same way as binding threads, and there are no limitations on the material and mechanical configuration. The upper thread 50 and the lower thread 51 may be made by twisting or knitting fibers. The upper thread 50 and the lower thread 51 may be made by twisting or knitting metal wires. The upper thread 50 and the lower thread 51 may be simple metal wires. The upper thread 50 and the lower thread 51 may be a composite material made of fibers and metal wires.

[0041] (Another configuration example of the dry separation device 1) In the above, an example of solving the problem of the present invention has been shown in which the air dispersion member 4 is provided with fastening means such as the bolts 44 and nuts 45, but the means of solving the problem of the present invention are not limited to this. As will be shown below, the problem can also be solved by making changes to the fluidization tank 2 or the air chamber 3 of the dry separation apparatus 1.

[0042] FIG. 4(A) is a side cross-sectional view showing another example of the dry separation apparatus 1, and FIG. 4(B) is a cross-sectional view of the dry separation apparatus 1 taken along the plane indicated by line BB' in FIG. 4(A). As shown in FIGS. 4(A) and 4(B), the dry separation apparatus 1 according to this example includes an upper contact member 52 fixed to the fluidized bed 2 and abutting against the upper surface of the air dispersion member 4, and a lower contact member 53 located directly below the upper contact member 52, fixed to the air chamber 3, and abutting against the lower surface of the air dispersion member 4. As such, the dry separation apparatus 1 according to this example includes the upper contact member 52 and the lower contact member 53, and the air dispersion member 4 is sandwiched and compressed between the upper contact member 52 and the lower contact member 53. Therefore, even if out-of-plane distortion remains in the perforated plate 41 (not shown in FIG. 4) and a gap occurs between the perforated plate 41 and the filter medium 42 (not shown in FIG. 4), the gap is crushed. As a result, the bias in the flow rate or flow velocity of the air flowing out from the air dispersion member 4 caused by the presence of the gap is eliminated, and therefore the separation accuracy of the material to be treated by the dry separation device 1 is improved.

[0043] As described above, the air dispersion member 4 or dry separation apparatus 1 can prevent gaps from forming between the perforated plates 41 and the filter media 42 in the air dispersion member 4, which is configured by sandwiching the sheet-like filter media 42 between two perforated plates 41. This can prevent variations in the flow rate or flow velocity of the air passing through the air dispersion member 4 that would otherwise occur due to the presence of such gaps. This also prevents turbulence in the air flow within the fluidization tank 2. As a result, the separation accuracy of the material to be treated by the dry separation apparatus 1 is improved.

[0044] As described above, the turbulence of the air flow in the fluidization tank 2 caused by the gap between the perforated plate 41 and the filter medium 42 is particularly pronounced in a dry separation apparatus 1 equipped with a vibrator 9, i.e., a vibrating means. Therefore, the above-described effect is also particularly pronounced in a dry separation apparatus 1 equipped with a vibrating means.

[0045] The technical scope of the present invention is not limited to the above-described embodiments, and the present invention can be freely applied, modified, or improved within the scope of the technical concept described in the claims.

[0046] For example, the mechanical configuration, shape, number, and arrangement of the fastening means provided in the air dispersion member are not limited to those exemplified above, and can be freely modified or designed as long as the function of fastening two perforated plates together and applying surface pressure to the filter medium between the two perforated plates is achieved.

[0047] Similarly, the fastening and fixing means can be freely modified or designed as long as it achieves the function of fastening two perforated plates together and applying surface pressure to the filter material between the two perforated plates.

[0048] In the above example, the upper end of the upper contact member 52 is fixed to the top plate of the fluidizing tank 2. However, the upper contact member of the present invention need only be fixed to any part of the fluidizing tank, and is not limited to being fixed to the top plate of the fluidizing tank. The upper contact member of the present invention may also be fixed to, for example, a side plate of the fluidizing tank.

[0049] In the above, an example was shown in which the lower end of the lower contact member 53 is fixed to the bottom plate of the air chamber 3, but the lower contact member according to the present invention is not limited to being fixed to the bottom plate of the air chamber, and it is sufficient if it is fixed to any part of the air chamber. The lower contact member according to the present invention may also be fixed to, for example, a side plate of the air chamber.

[0050] Furthermore, although punched metal has been cited above as a specific example of a porous plate, the porous plate is not limited to punched metal. The material of the porous plate is not limited to metal. The porous plate may be made of a non-metallic material, for example, ceramic, synthetic resin, or composite material. The means for forming holes in the porous plate is not particularly limited. The holes may be formed by press working, drilling with a drill, or laser processing. The shape of the holes in the porous plate is also not limited. The shape of the holes may be a perfect circle, an ellipse, a polygon, or any other shape.

[0051] Furthermore, the material, mechanical structure, and mechanical properties of the sheet-shaped filter medium are not limited, and in other words, in the present invention, the sheet-shaped filter medium can be selected arbitrarily.

[0052] It goes without saying that in practicing the present invention, components not exemplified above can be added to the air distribution member or dry separation device.

[0053] In the above example, the fluidization tank 2 is provided with two discharge ports 6, one above the other, but the dry separation apparatus of the present invention is not limited to this. Discharge ports may be provided in three or more locations. The height of the inlet 5 or discharge port 6 in the fluidization tank 2 shown in Figure 1 or Figure 4 is merely an example, and the height of the inlet or discharge port in the fluidization tank of the dry separation apparatus of the present invention is not limited to that shown in Figures 1 and 4.

[0054] Furthermore, in the above description, a dry separation apparatus 1 equipped with a vibrator 9 was given as an example, and it was explained that the present invention is particularly required in a dry separation apparatus equipped with a vibrating means. However, the application of the present invention is not limited to a dry separation apparatus equipped with a vibrating means or to an air dispersion member constituting such a dry separation apparatus. In other words, the present invention can be applied to a dry separation apparatus not equipped with a vibrating means, or to an air dispersion member constituting a dry separation apparatus not equipped with a vibrating means. In this case, too, the present invention can improve the separation accuracy of the material to be processed by the dry separation apparatus. [Industrial Applicability]

[0055] The air dispersion member according to the present invention is useful as a component of a dry separation device that uses multiple types of powder and granular materials with different densities as components and separates a processing object formed by mixing the components into individual components by utilizing the density differences between the components.The dry separation device according to the present invention is useful as a dry separation device that uses multiple types of powder and granular materials with different densities as components and separates a processing object formed by mixing the components into individual components by utilizing the density differences between the components. [Explanation of symbols]

[0056] 1 dry separation device, 2 fluidized bed, 3 air chamber, 4 air dispersion member, 5 inlet, 6 outlet, 7 exhaust port, 8 filter, 9 vibrator, 41 perforated plate, 42 filter material, 43 small hole, 44 bolt, 45 nut, 46 washer, 47 rivet, 48 pin, 49 adhesive 50 upper thread, 51 lower thread, 52 upper contact member, 53 lower contact member

Claims

1. A dry separation device includes a fluidization tank into which a material to be treated is introduced, and an air chamber below the fluidization tank and adjacent to the fluidization tank, to which pressurized air is supplied from the outside. The air dispersion member is disposed at the boundary between the fluidization tank and the air chamber to separate the two and to disperse air flowing from the air chamber to the fluidization tank. The air dispersion member is configured by sandwiching a sheet-like filter medium between two perforated plates, The present invention is characterized in that it comprises a fastening means arranged at a position away from the periphery of the air dispersion member, fastening the two perforated plates together to correct distortion of the two perforated plates in the out-of-plane direction. Air dispersion member.

2. The invention is characterized in that it comprises a plurality of the fastening means. The air dispersion member of claim 1 .

3. In the planar shape of the air dispersion member, a plurality of the fastening means are arranged in a lattice pattern.

3. The air dispersion member of claim 2.

4. The fastening means is A bolt is inserted into a through hole that penetrates the air dispersion member, and a nut is screwed onto the bolt. The air dispersion member of claim 1 .

5. The fastening means is The rivet is inserted into a through hole that penetrates the air dispersion member. The air dispersion member of claim 1 .

6. The fastening means is A pin is inserted into a through hole penetrating the air dispersion member and both ends of the pin are welded and fixed to the porous plate. The air dispersion member of claim 1 .

7. The fastening means is A linear member that stitches together the two perforated plates. The air dispersion member of claim 1 .

8. a fluidized bed into which the material to be treated is introduced; an air chamber below and adjacent to the fluidization tank, to which pressurized air is supplied from the outside; The air dispersion member according to any one of claims 1 to 7 is disposed at the boundary between the fluidized bed and the air chamber to separate them. Dry separation equipment.

9. a fluidized bed into which the material to be treated is introduced; an air chamber below and adjacent to the fluidization tank, to which pressurized air is supplied from the outside; A dry separation apparatus comprising: a flat air dispersion member formed by sandwiching a sheet-like filter medium between two perforated plates; the air dispersion member being disposed at the boundary between the fluidization tank and the air chamber to separate them; and the air dispersion member dispersing air flowing from the air chamber to the fluidization tank; an upper contact member that is disposed inside the fluidization tank and fixed to the fluidization tank and contacts the upper surface of the air dispersion member at a position away from the periphery of the fluidization tank; a lower abutment member disposed inside the air chamber immediately below the upper abutment member, fixed to the air chamber, and abutting against the lower surface of the air dispersion member at a position away from the periphery of the air chamber, Dry separation equipment.

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