JP2021113422A - Sound absorbing panel, and manufacturing method of sound absorbing panel - Google Patents

Abstract

To provide a sound absorbing panel capable of making a perforated board thin by suppressing deflection of the perforated board, and a manufacturing method of a sound absorbing panel.SOLUTION: A sound absorbing panel 1 includes: a base plate 10 at whose both side edges a pair of standing portions 11 are formed; a sound absorbing material 30 disposed along the base plate 10 and held between the pair of standing portions 11; and a perforated board 20 which is disposed along the sound absorbing material 30 and at whose both side edges a pair of engaging portions 21 are formed. The pair of standing portions 11 are outwardly pressed to be in contact with an inside of the pair of engaging portions 21, to apply tension to the perforated board 20.SELECTED DRAWING: Figure 1

Description

The present invention relates to a sound absorbing panel and a method for manufacturing a sound absorbing panel.

Sound absorbing materials are installed on the ceilings and walls of buildings, bridge structures, tunnel structures, etc. to absorb internal noise.
As the sound absorbing material, a porous material such as glass wool or polyester foam having high sound absorbing property is used. Since the sound absorbing material itself has no rigidity, a perforated plate having a high aperture ratio such as punching metal is laminated on the surface side (sound absorbing surface side) to form a panel, and the sound absorbing material is arranged along the ceiling surface or the wall surface. Internal noise from buildings and the like is taken in through the openings of the perforated plate and absorbed by the porous sound absorbing material (see Patent Document 1).
In recent years, sound absorbing panels and perforated plates have been unitized. For example, plate materials such as aluminum and stainless steel are processed to form a flat box-shaped substrate having an upright portion on the peripheral edge, and the substrate is erected. A structure is adopted in which the sound absorbing material is housed inside the portion and the peripheral edge of the perforated plate covering the sound absorbing material is supported by the upright portion. The sound absorbing panel is formed to have a width of about 500 to 1000 mm and a length of about 1000 to 2000 mm, for example.
By the way, when the sound absorbing panel is installed on the ceiling surface, the perforated plate such as punching metal may bend downward due to its own weight and the weight of the sound absorbing material. Even when installed on a wall surface, the weight of the sound absorbing material is applied to the lower half of the punching metal, which may cause the punching metal to bend toward the front side.
In order to prevent such bending, in the conventional sound absorbing panel, the thickness of the perforated plate is set to about 1 mm.

Japanese Unexamined Patent Publication No. 5-171731

In recent years, sound absorbing panels have also been required to reduce costs by reducing weight and materials.
However, among the sound absorbing panels, the perforated plate is required to have a sufficient thickness to prevent the above-mentioned bending. Due to such restrictions, it is difficult to reduce the weight of the sound absorbing panel by thinning the perforated plate, and it is also difficult to reduce the cost by reducing the material of the perforated plate. In addition, it was difficult to simplify metal processing (pressing and punching) because the perforated plate could not be thinned.

An object of the present invention is to provide a sound absorbing panel and a method for manufacturing a sound absorbing panel, which can suppress bending of the perforated plate and thin the perforated plate.

The sound absorbing panel of the present invention includes a substrate having a pair of upright portions formed on both side edges, a sound absorbing material arranged along the substrate and held between the pair of upright portions, and the sound absorbing material. It has a perforated plate that is arranged and has a pair of engaging portions formed on both side edges, and a pair of the upright portions are pressure-welded outward to the inside of the pair of the engaging portions to the perforated plate. It is characterized in that tension is applied.

In the present invention as described above, by pressing the pair of standing portions outward on the inside of the pair of engaging portions, that is, by pressing the pair of engaging portions inward on the outside of the pair of standing portions. The perforated plate is supported by the substrate in a state where tension is applied to the perforated plate, and a sound absorbing material is held between the perforated plates.
In the perforated plate, the pair of engaging portions are urged in a direction away from each other by pressure welding between the engaging portion and the upright portion, and are pushed outward. As a result, tension is applied to the perforated plate, and displacement in the surface crossing direction, that is, bending due to its own weight and the weight of the sound absorbing material is suppressed.
As described above, in the perforated plate supported by the substrate, even if the weight of the sound absorbing material is applied, the bending can be suppressed by the tension applied to the perforated plate. As a result, the perforated plate can be made thinner, and the weight and cost can be reduced. For example, a perforated plate having a conventional plate thickness of 1 mm can be thinned to about 0.4 mm.

In the sound absorbing panel of the present invention, there is an outer inclined surface formed on the outside of the pair of the upright portions and inclined so as to be separated from each other as the distance from the main body of the substrate is increased, and an outer inclined surface formed on the inside of the pair of the engaging portions. It is preferable to have at least one of an inner inclined surface that is inclined so as to approach each other as the distance from the main body of the hole plate increases.
In such an invention, the perforated plate is supported by the substrate by pressure welding between the outer inclined surface of the substrate and the engaging portion of the perforated plate, or by pressure welding between the inner inclined surface of the perforated plate and the upright portion of the substrate. NS. At this time, the perforated plate is displaced in the direction away from the substrate due to its own weight and the weight of the sound absorbing material, so that the pressure contact between the outer inclined surface and the engaging portion and the pressure contact between the inner inclined surface and the upright portion are further strengthened. And the tension on the perforated plate can be increased. As a result, prevention of bending is promoted with a simple structure, and stronger pressure welding can be obtained, so that a function of preventing disengagement and a function of preventing rattling can be obtained.

In the sound absorbing panel of the present invention, the tip portions of the pair of engaging portions separated from the main body of the perforated plate are pressed against the pair of standing portions from the outside, and the tip portions are attached to the pair of engaging portions. It is preferable that bending moments in directions away from each other are applied.
In the present invention as described above, both end edges of the perforated plate on which the engaging portion is formed receive bending moments according to the lever length to the tip portion thereof, and the main body of the perforated plate is between the both end edges. The middle part is lifted. As a result, in the perforated plate supported by the substrate, even if the weight of the sound absorbing material is applied, the load is canceled by the force of lifting the intermediate portion of the perforated plate by the engaging portion, and this also cancels out the burden load of the perforated plate. Deflection can be suppressed.

In the sound absorbing panel of the present invention, it is preferable that the pair of the upright portions have an extending portion extending in a direction along the substrate at a tip portion away from the main body of the substrate.
In such an invention, the rigidity of the upright portion can be increased to enhance the supporting performance of the perforated plate. That is, when the erecting portion extends along a pair of edges of the substrate and is connected to a beam installed on another edge intersecting the same edge, the reaction force with respect to the engaging portion causes the upright portion. Inward bending occurs in the upright portion. In the portion of the upright portion close to the beam, the force that causes the deflection can be borne by the beam, but in the intermediate portion of the upright portion away from the beam, if the rigidity of the upright portion is not sufficient, the deformation of the deflection becomes apparent. On the other hand, by forming the extending portions in the direction along the substrate in the pair of standing portions, the rigidity of the standing portions can be increased, thereby improving the supporting performance of the perforated plate.

The sound absorbing panel manufacturing method of the present invention uses a substrate having a pair of standing portions formed on both side edges, a sound absorbing material, and a perforated plate having a pair of engaging portions formed on both side edges, and the sound absorbing material. Is arranged along the substrate and held between the pair of the upright portions, and the perforated plate is arranged along the sound absorbing material to the substrate by the pair of the engaging portions and the upright portions. When the perforated plate is mounted on the substrate, the pair of upright portions are pressed outward inside the pair of engaging portions to apply tension to the perforated plate. And.
In such a manufacturing method of the present invention, the effects as described in the sound absorbing panel of the present invention described above can be obtained.

According to the present invention, it is possible to provide a sound absorbing panel and a method for manufacturing a sound absorbing panel, which can suppress the bending of the perforated plate and thin the perforated plate.

The perspective view which shows the whole of the sound absorption panel which is one Embodiment of this invention. An enlarged cross-sectional view showing an end portion of the sound absorbing panel of the embodiment. The enlarged sectional view which shows the support structure of the sound absorption panel of the said embodiment. The exploded perspective view which shows the assembly operation of the sound absorption panel of the said embodiment. The schematic diagram which shows the deformed state in the perforated plate of the said embodiment. The schematic diagram which shows the deformed state in the sound absorption panel of the said embodiment. An enlarged cross-sectional view showing an end portion of a sound absorbing panel according to another embodiment of the present invention. An enlarged cross-sectional view showing an end portion of a sound absorbing panel according to another embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, the sound absorbing panel 1 has a substrate 10 having a pair of upright portions 11 formed on both side edges and a perforated plate 20 having a pair of engaging portions 21 formed on both side edges. A sound absorbing material 30 is installed between the substrate 10 and the perforated plate 20.
The sound absorbing material 30 is a porous material such as glass wool or polyester foam having high sound absorbing properties. The sound absorbing material 30 is housed between a pair of upright portions 11 along the lower surface of the substrate 10, and the lower surface side thereof is covered with the perforated plate 20 to fill the space between the substrate 10 and the perforated plate 20. Will be done. The weight of the sound absorbing material 30 is borne by the perforated plate 20 on the lower surface side.

The substrate 10 is formed by laminating two steel folding plate materials (outer plate 12 and inner plate 13).
In FIG. 2, the outer plate 12 has a pair of upright portions 11 having the above-mentioned edges on both sides, and a plurality of groove portions 121 are formed in the intermediate portion in parallel with the upright portion 11.
The inner plate 13 is formed with upward edge portions 131 at both ends, is in contact with the inner side surface of the outer plate 12 via the edge portions 131, and is fixed by welding or the like.
The rising height of the edge portion 131 is adjusted to the inward protrusion dimension of the groove portion 121 of the outer plate 12, and the intermediate portion of the inner plate 13 and the plurality of groove portions 121 are in contact with each other and are fixed by welding or the like.
By laminating the outer plate 12 and the inner plate 13 of the substrate 10, a plurality of flat box-shaped structures continuous in the stretching direction of the upright portion 11 are formed, and sufficient rigidity is secured in the stretching direction.

The substrate 10 has beam members 14 at both ends of the upright portion 11 in the stretching direction.
In FIG. 3, the beam member 14 is a steel material having a C-shaped cross section, and its upper side surface is brought into contact with the inner plate 13 and fixed by welding or the like.
The substrate 10 is ensured to have rigidity in the width direction, that is, in the direction intersecting with the upright portion 11 by a pair of beam members 14 at both ends.
Therefore, in the substrate 10, the rigidity in the width direction is secured by the beam member 14, and the rigidity in the stretching direction of the upright portion 11 is secured by the box-shaped structure described above. As a result, the substrate 10 is secured with sufficient strength for the operator to walk.
When the substrate 10 is installed, it is fixed to the beam 16 to be installed by a bolt 15 penetrating the inner plate 13 and the outer plate 12 from the beam member 14.

Returning to FIGS. 1 and 2, the perforated plate 20 has engaging portions 21 on both side edges, and an edge portion 22 is formed on the edge in the intersecting direction. The perforated plate 20 is a so-called punching metal, and has a large number of holes (partially not shown) opened on the entire surface except for the engaging portion 21 and the edge portion 22.
The perforated plate 20 is mounted on the lower surface side of the substrate 10 to hold the sound absorbing material 30 by engaging the engaging portions 21 on both side edges with the standing portions 11 on both sides of the substrate 10.
The upright portion 11 of the substrate 10 extends downward from both side edges of the outer plate 12, is recessed by a step, and then is inclined outward (the side where the pair of upright portions 11 are separated from each other) toward the tip, and the outer surface thereof is the outer side. It is said to be an inclined surface 112.
At the tip edge of the upright portion 11, an extension portion 111 extending inward (the side where the pair of upright portions 11 face each other) is formed over the entire length.

The upright portions 11 are pressed outward from the inside to the engaging portions 21 of the perforated plate 20, and the pair of engaging portions 21 are urged in opposite directions to tension T201 on the perforated plate 20. (See FIGS. 4 and 5) are granted.
The engaging portion 21 rises with an upward inclination from both end edges of the perforated plate 20, and the inner surface thereof is an inner inclined surface 212. The inclination of the engaging portion 21 is formed to be slightly tighter than the inclination of the standing portion 11, and the perforated plate 20 is urged downward by its own weight, so that the engaging portion 21 has an outer inclined surface 112 at its tip portion 211. The tension T201 of the perforated plate 20 described above is applied to the engaging portion 21, and the bending moment M21 (see FIGS. 4 and 5) is applied to the engaging portion 21.

In the present embodiment, the sound absorbing panel 1 is assembled as follows.
First, the outer plate 12, the inner plate 13, and the beam material 14 described above are assembled to manufacture the substrate 10, the perforated plate 20 is manufactured, and the sound absorbing material 30 is further prepared.
Next, the sound absorbing material 30 is installed on the lower surface side of the substrate 10 (the side on which the standing portion 11 stands up). At this time, the work can be facilitated by placing the lower surface side of the substrate 10 upward and laying the sound absorbing material 30 on the surface between the upright portions 11 from above the substrate 10.

Subsequently, the perforated plate 20 is mounted on the lower surface side of the substrate 10. The perforated plate 20 is attached to the substrate 10 by engaging the pair of engaging portions 21 on both sides with the outside of the standing portion 11. Therefore, when mounting the substrate 10, an operation of elastically deforming the engaging portion 21 of the perforated plate 20 and the standing portion 11 of the substrate 10 is performed.
Specifically, first, the perforated plate 20 is arranged on the lower surface side of the substrate 10, and one engaging portion 21 of the perforated plate 20 is engaged with the outside of the upright portion 11 of the opposing substrate 10. Next, the engaging portion 21 on the opposite side of the perforated plate 20 is pulled out to the outside of the standing portion 11 of the opposing substrate 10 to be elastically deformed, and then engaged with the outer surface of the standing portion 11.

In FIG. 4, in a state where one engaging portion 21 of the perforated plate 20 is engaged with the substrate 10, the engaging portion 21 on the opposite side is pulled to the outside of the opposite standing portion 11 to engage a pair. An outward force F21 is applied to each of the joint portions 21 (directions away from each other), and the tip portions 211 of the pair of engaging portions 21 are each expanded outward. At the same time, in the substrate 10, an inward (direction approaching each other) force F11 is applied to each of the pair of upright portions 11, and the tips of the pair of upright portions 11 are deformed inward. As a result, the tip portions 211 of the pair of engaging portions 21 get over the tips of the standing portions 11 and come into contact with the outer surface. The perforated plate 20 is mounted on the substrate 10 by abutting the tip portions 211 on both sides with the outer surfaces of the upright portions 11, respectively.

In the perforated plate 20 mounted on the substrate 10, tension T201 is applied to the perforated plate 20 by receiving a force F21 in the direction away from each other at the engaging portions 21 on both sides, and the load of the sound absorbing material 30 or the like is applied. Deflection in the surface crossing direction is suppressed.
Further, in the perforated plate 20, the force F21 from the standing portion 11 is maintained by the pair of engaging portions 21, and the base end portion of the engaging portion 21 (the portion connected to the main body of the perforated plate 20). Is subject to a bending moment M21.
As shown in FIG. 5, in the perforated plate 20, the bending moments M21 are applied to both sides of the perforated plate 20, so that a force F201 that displaces upward is generated in the intermediate portion 201 of the perforated plate 20. As described above, the load of the sound absorbing material 30 is applied to the perforated plate 20, but the load F30 of the sound absorbing material 30 can be borne by the force F201, and the intermediate portion 201 of the perforated plate 20 moves downward. It can be prevented from being deformed.
As described above, in the present embodiment, the tension T201 applied to the perforated plate 20 suppresses the bending of the perforated plate 20, and the bending moments M21 on both sides enhance the suppression of the bending of the perforated plate 20. Will be done.

Regarding the prevention of deformation of the sound absorbing material 30 of the perforated plate 20 due to the load, the bending moment M21 that generates an upward force F201 in the intermediate portion 201 is due to the force F21 from the standing portion 11 of the substrate 10. Here, the bending rigidity and the torsional rigidity of the upright portion 11 of the substrate 10 may change depending on the position in the stretching direction.
In FIG. 6, the substrate 10 has beam members 14 at both ends of the upright portion 11 in the stretching direction, and sufficient rigidity (bending and twisting) is obtained at both ends of the upright portion 11 in the stretching direction as well. However, in the intermediate portion of the upright portion 11, the rigidity decreases as the distance from the beam member 14 increases (see graph K2 in the lower part of FIG. 6), and bending and twisting deformation occur (see the two-dot chain line in FIG. 6).

On the other hand, the standing portion 11 of the present embodiment is formed with an extending portion 111 extending inward (the side where the pair of standing portions 11 face each other) over the entire length thereof, and the moment of inertia of area of the standing portion 11 is formed. Is improved to alleviate the change in rigidity in the extension direction (see graph K1 in the lower part of FIG. 6).
As a result, the deformation of the upright portion 11 in the intermediate portion is suppressed, the fluctuation of the bending moment M21 obtained in the engaging portion 21 of the perforated plate 20 in the extension direction is suppressed, and the intermediate portion 201 is downward in the perforated plate 20. It can be surely prevented from being deformed to.

According to the present embodiment described above, the following effects can be obtained.
In the present embodiment, the pair of standing portions 11 are pressed outward on the inside of the pair of engaging portions 21, that is, the pair of engaging portions 21 are pressed inward on the outside of the pair of standing portions 11. Therefore, the perforated plate 20 is supported by the substrate 10 in a state where tension is applied to the perforated plate 20, and the sound absorbing material 30 can be held between the perforated plates 20.
In the perforated plate 20, the tip portions 211 of the pair of engaging portions 21 are urged in opposite directions by pressure contact between the engaging portion 21 and the standing portion 11, and are pushed outward. As a result, tension is applied to the perforated plate, and displacement in the surface crossing direction, that is, bending due to its own weight and the weight of the sound absorbing material 30 is suppressed.

In this way, in the perforated plate 20 supported by the substrate 10, even if the weight (F30) of the sound absorbing material 30 is applied, the bending can be suppressed by the tension applied to the perforated plate 20. As a result, the perforated plate 20 can be made thinner, and the weight and cost can be reduced. For example, the perforated plate 20 having a conventional plate thickness of 1 mm can be thinned to about 0.4 mm.

In the present embodiment, the pair of upright portions 11 are outer inclined surfaces 112 whose outer surfaces are separated from each other as they are separated from the main body of the substrate 10 (from the base portion of the upper portion toward the tip end of the lower portion). Therefore, the tip portion 211 of the engaging portion 21 that is in pressure contact with the outer inclined surface 112 of the standing portion 11 is urged toward the main body side of the substrate 10 along the outer inclined surface 112, and has a simple structure to prevent disengagement. The function of preventing rattling can be obtained.

In the present embodiment, in each of the pair of engaging portions 21, the tip portions 211 separated from the main body of the perforated plate 20 are pressed against the pair of standing portions 11 from the outside, and the tip portions 211 are mutually attached to the pair of engaging portions 21. A bending moment M21 in the direction of separation is applied.
As a result, both end edges of the perforated plate 20 on which the engaging portion 21 is formed receive a bending moment M21 according to the lever length up to the tip portion 211, and the main body of the perforated plate 20 is between the both end edges. Is lifted (see force F201 in FIGS. 4 and 5). As a result, in the perforated plate 20 supported by the substrate 10, even if the weight of the sound absorbing material 30 is applied, the burden load is canceled by the force F201 that lifts the intermediate portion of the perforated plate 20 by the engaging portion 21. It is also possible to suppress the bending of the perforated plate 20.

In the present embodiment, the pair of engaging portions 21 are inner inclined surfaces 212 inclined along the outer inclined surface 112 of the standing portion 11. Therefore, the pair of standing portions 11 and the engaging portions 21 are substantially parallel to each other to minimize the gap between them, and the overall size can be reduced. Even in this case, the tip portion 211 of the engaging portion 21 can be pressed against the outer inclined surface 112 of the standing portion 11 by providing a slight difference in inclination angle.
As a result, the lever length from the main body of the perforated plate 20 to the tip portion 211 can be secured, and the desired bending moment M21 can be secured.

In the present embodiment, the pair of standing portions 11 have extending portions 111 extending inward from each other at the tip portions separated from the main body of the substrate 10. Therefore, the rigidity of the upright portion 11 can be increased to enhance the supporting performance of the perforated plate 20.
That is, when the structure is such that the upright portion 11 extends along a pair of edges of the substrate 10 and is connected to a beam member 14 installed on another edge that intersects the edge, the perforated plate Due to the force F11 that causes the tension T201 to be generated in 20 and the bending moment M21 to be generated in the engaging portion 21, the standing portion 11 is bent in the opposite direction and bent inward. In the portion of the upright portion 11 close to the beam member 14, the beam member 14 can bear the force that causes bending and bending, but in the intermediate portion of the upright portion 11 away from the beam member 14, the rigidity of the upright portion 11 is insufficient. , Bending and bending deformations become apparent. On the other hand, by forming the inward extending portions 111 on the pair of standing portions 11, the rigidity of the standing portions 11 can be increased, thereby improving the supporting performance of the perforated plate 20.

The present invention is not limited to the above-described embodiment, and modifications within the range in which the object of the present invention can be achieved are included in the present invention.
In the above embodiment, the outer inclined surface 112 is formed on the upright portion 11, and the inner inclined surface 212 is formed on the engaging portion 21. Then, by slightly inclining the engaging portion 21, the tip portion 211 of the engaging portion 21 was engaged with the inclined outer surface of the standing portion 11. On the other hand, the engaging portion 21 is raised vertically (perpendicular to the main body of the perforated plate 20), its tip is extended inward (opposite sides of the pair of engaging portions 21), and the tip is raised. It may be engaged with the inclined outer surface of the portion 11. Even with such a configuration, it is possible to obtain a function of preventing disengagement due to an inclined surface and a function of preventing rattling, and it is possible to secure a bending moment M21 with a sufficient lever length.

In another embodiment of the present invention shown in FIG. 7, an upright portion 11A is formed to be inclined at an end portion of the substrate 10A, and the outside (right side in the drawing) is an outer inclined surface 112A, and the upright portion 11A is outwardly directed to the tip thereof. The extension portion 111A of the above is formed. On the other hand, an engaging portion 21A is formed at the end of the perforated plate 20A.
However, the engaging portion 21A of the present embodiment rises vertically from the end portion of the perforated plate 20A, the tip thereof is folded back inward (toward the left in the figure), and the tip portion 211A becomes the outer inclined surface 112A of the standing portion 11A. It is pressure-welded. That is, the engaging portion 21A of the present embodiment is not formed with the inner inclined surface 212 as in the embodiment of FIG.
Also in this embodiment as described above, the perforated plate 20 is displaced downward in the drawing with respect to the substrate 10, so that the tip portion 211A is displaced outward along the outer inclined surface 112A. Therefore, similarly to the embodiment of FIG. 1, the effect of suppressing the bending of the perforated plate 20 by the tension T201 and the bending moment M21 (see FIGS. 4 and 5) can be obtained. However, since the inner inclined surface 212 as in the embodiment of FIG. 1 is not formed, the thickness of the portion where the standing portion 11A and the engaging portion 21A overlap is larger than that of the embodiment of FIG.

In another embodiment of the present invention shown in FIG. 8, an upright portion 11B is formed at the end of the substrate 10B, and an outward (rightward in the figure) extending portion 111B is formed at the tip thereof. The upright portion 11B is formed vertically, and the outer inclined surface 112 as in the embodiment of FIG. 1 is not formed on the outer side thereof.
On the other hand, an engaging portion 21B that rises vertically is formed at the end of the perforated plate 20B. The tip of the engaging portion 21B is bent inward (to the left in the drawing), and then the portion extending to the tip portion 211B is bent downward. The downward portion has a predetermined inclination, and an inner inclined surface 212B is formed on the inner side surface thereof. The extending portion 111B of the standing portion 11B is pressed outward (to the right in the drawing) to the inner inclined surface 212B.
Also in this embodiment as described above, when the perforated plate 20 is displaced downward in the drawing with respect to the substrate 10, the inner inclined surface 212B to which the tip of the extending portion 111A is in pressure contact is displaced outward. Therefore, similarly to the embodiment of FIG. 1, the effect of suppressing the bending of the perforated plate 20 by the tension T201 and the bending moment M21 (see FIGS. 4 and 5) can be obtained. However, also in this embodiment, the thickness of the portion where the standing portion 11B and the engaging portion 21B overlap is larger than that in the embodiment of FIG.

In the above embodiment, the standing portion 11 is provided with an extending portion 111 to increase the rigidity of the standing portion 11, but if the standing portion 11 has sufficient rigidity to support the perforated plate 20, the extending portion 11 is extended. The protrusion 111 may be omitted.
In the above embodiment, the beam members 14 are provided at both ends of the upright portion 11 in the extending direction, but the beam members 14 may be provided at the intermediate portions in the same direction.
In the above embodiment, the substrate 10 is not limited to the one in which the outer plate 12, the inner plate 13 and the beam member 14 can be assembled, and for example, each part may be integrally formed and includes other auxiliary structures. There may be. The perforated plate 20 may be punched metal or the like in which engaging portions 21 are formed on at least both side edges, and the opening shape is not limited to a round hole and may be arbitrary, for example, a net may be stretched over a relatively large opening. It may be an opening.

The present invention can be used for sound absorbing panels and methods for manufacturing sound absorbing panels.

1 ... Sound absorbing panel, 10,10A, 10B ... Substrate, 11,11A, 11B ... Standing part, 111,111A, 111B ... Extension part, 112,112A ... Outer inclined surface, 12 ... Outer plate, 121 ... Groove part, 13 ... Inner plate, 131 ... Edge, 14 ... Beam material, 15 ... Bolt, 16 ... Beam, 20, 20A, 20B ... Perforated plate, 201 ... Intermediate part, 21,21A, 21B ... Engagement part, 211, 211A , 211B ... Tip, 212,212B ... Inner inclined surface, 22 ... Edge, 30 ... Sound absorbing material, F11 ... Force, F201 ... Force, F21 ... Force, F30 ... Load, M21 ... Bending moment, T201 ... Tension.

Claims (5)

A substrate having a pair of upright portions formed on both side edges, a sound absorbing material arranged along the substrate and held between the pair of upright portions, and a pair arranged along the sound absorbing material and on both side edges. With a perforated plate on which the engaging portion of the
A sound absorbing panel characterized in that a pair of the upright portions are pressure-welded outward to the inside of the pair of the engaging portions, and tension is applied to the perforated plates. In the sound absorbing panel according to claim 1,
An outer inclined surface formed on the outside of the pair of the upright portions and inclined so as to separate from the main body of the substrate, and an outer inclined surface formed on the inside of the pair of the engaging portions and separated from the main body of the perforated plate. A sound absorbing panel characterized by having at least one of an inner inclined surface inclined so as to approach each other. In the sound absorbing panel according to claim 2,
In each of the pair of the engaging portions, the tip portions separated from the main body of the perforated plate are pressed against the pair of the standing portions from the outside, and the pair of the engaging portions have a bending moment in the direction in which the tip portions are separated from each other. A sound absorbing panel characterized by being given. In the sound absorbing panel according to any one of claims 1 to 3.
The pair of the upright portions are sound absorbing panels characterized by having an extending portion extending in a direction along the substrate at a tip end portion away from the main body of the substrate. The sound absorbing material is arranged along the substrate by using a substrate having a pair of standing portions formed on both side edges, a sound absorbing material, and a perforated plate having a pair of engaging portions formed on both side edges. The perforated plate is placed between the pair of the upright portions, and the perforated plate is arranged along the sound absorbing material and mounted on the substrate by the pair of the engaging portions and the upright portions.
A sound absorbing panel characterized in that when the perforated plate is mounted on the substrate, a pair of the upright portions are pressed outward inside the pair of engaging portions to apply tension to the perforated plate. Production method.

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