An A-level fireproof adjustable sound absorption device

Abstract

The present invention relates to an adjustable sound-absorbing device with Class A fire protection, which comprises a metal base, a sound-absorbing component, a panel component and a transmission component. The panel component includes a plurality of strip-shaped metal louvers; the plurality of metal louvers are arranged in parallel at the opening of the cavity and arranged in a fluctuating manner along the depth direction of the cavity; when the plurality of metal louvers are assembled into a panel shape at the opening, the opening of the cavity is covered, and when the plurality of metal louvers rotate, the opening of the cavity is opened; the adjustable sound-absorbing device with Class A fire protection of the present invention realizes the requirement of Class A fire protection; the fluctuating structures of the metal louvers and the metal profile plates on the surface of the panel component increase the sound diffusion performance of the panel component of the adjustable sound-absorbing device, so that they will not gather together back and forth to form harmful standing waves; the structural setting of the transmission component enables the metal louvers in different depth directions to achieve synchronous flipping; through the flipping of the metal louvers, the adjustable sound-absorbing device can adjust the reverberation time parameter.

Description

Technical Field

[0001] The present invention belongs to the technical field of sound absorption, and particularly relates to an adjustable sound absorption device with Class A fire resistance. Background Art

[0002] Generally speaking, large theaters mainly have two major functions: art performances and conferences. These two different functions have different requirements for the reverberation time parameter of the sound in the venue and different sound absorption effects.

[0003] The definition of reverberation time is the time required for the sound pressure level to decay by 60 dB after the sound source stops emitting sound when the indoor sound field reaches a steady state. Generally speaking, the reverberation time is an important indicator to describe the clarity and fullness of sound listening. When the reverberation time is short, the clarity is high, but the fullness is poor; when the reverberation time is long, the fullness is good, but the clarity is poor. According to the different functional uses of the theater, the reverberation time in the theater is adjusted to achieve a comfortable sound listening effect.

[0004] When there is an art performance, we need the sound to be full and loud, and the auditory effect in every corner to be the same. Sound diffusion is required to meet the needs of the on-site effect. At this time, less sound absorption material is needed inside the theater, and the reverberation time is slightly longer. When holding a meeting, we need the sound to be clear. At this time, more sound absorption material is needed inside the theater, and the reverberation time is slightly shorter to achieve a clear sound effect.

[0005] At present, when the adjustable sound absorption device is in a state with a slightly longer reverberation time parameter, its sound diffusion effect is not good, resulting in an increase in the mutual interference between sounds.

[0006] At the same time, for large theaters, it is of great significance for the adjustable sound absorption device to meet the fire protection requirements while satisfying the adjustable sound absorption characteristics. Summary of the Invention

[0007] The purpose of the present invention is to overcome the technical problems existing in the above background art, and provide an adjustable sound absorption device with Class A fire resistance, which adjusts the reverberation time in the use scenario to meet various acoustic functions.

[0008] In order to achieve the above technical purpose, the present invention adopts the following technical solutions:

[0009] An adjustable sound absorption device with Class A fire resistance, the adjustable sound absorption device includes a metal base, a sound absorption component, a panel component and a transmission component.

[0010] The metal base includes a cavity with an opening, and the metal base includes metal side plates on both sides.

[0011] The sound-absorbing component is composed of fireproof materials; the sound-absorbing component is arranged in the cavity; the sound-absorbing component meets the Class A fireproof requirement. When the opening is in the open state, the sound-absorbing component is used for sound absorption to reduce the reverberation time.

[0012] The panel component includes a plurality of strip-shaped metal louvers; the plurality of metal louvers are arranged in parallel at the opening of the cavity and are arranged in a undulating manner along the depth direction of the cavity; a metal profile plate is separably connected between the metal louvers in different depth directions; both the metal louvers and the metal profile plate are connected and arranged between the two metal side plates; fixing parts are provided at both ends of the metal louvers; when the plurality of metal louvers are assembled into a panel shape at the opening, the opening of the cavity is covered, and when the plurality of metal louvers rotate, the opening of the cavity is opened; the undulating structure formed by the metal louvers and the metal profile plate can increase the sound diffusion performance. Only the presence of the metal profile plate can completely close the opening of the cavity when the metal louvers are in the assembled state.

[0013] The transmission component drives the metal louvers to flip.

[0014] Preferably, the transmission component includes a transmission valve bar, fixing parts and a driving part, and the driving part drives the transmission valve bar to move; there are a plurality of the fixing parts; connection points matching the fixing parts of the metal louvers are provided on the transmission valve bar; the relative positions between each connection point are the same as the relative positions between each metal louver. One end of the fixing part is rotatably connected to the connection point of the transmission valve bar, and the other end of the fixing part is connected to the fixing part of the metal louver. Only when the positions of the connection points on the transmission valve bar meet the above requirements can the metal louvers in different depth directions be flipped synchronously. When the metal louvers are flipped, the angle between the fixing part and the metal louver remains unchanged, and the flipping of the metal louvers is realized by the rotation of the fixing part.

[0015] When the metal louvers are in the assembled state, the undulating structure of the metal louvers and the metal profile plate on the surface of the panel component increases the sound diffusion performance of the panel component of the adjustable sound-absorbing device, so that the sound diffuses and does not gather back and forth to form harmful standing waves. The structural setting of the transmission component enables the metal louvers in different depth directions to be flipped synchronously.

[0016] Preferably, the driving part includes a motor, a transmission rack and a metal connecting piece. The motor includes an output gear, and the output gear meshes with the transmission rack and drives the transmission rack; one end of the metal connecting piece is rotatably connected to the transmission rack, and the other end of the metal connecting piece is rotatably connected to the transmission valve bar. The transmission rack does not change its position in the depth direction of the cavity. The output gear of the motor drives the transmission valve bar to reciprocate, thereby controlling the flipping of the metal louvers.

[0017] Different from the specific structure of the above driving part, the driving structure can also be an electric push rod. One end of the electric push rod is movably connected to the transmission valve bar. The extension and contraction of the electric push rod cause the transmission valve bar to reciprocate, thereby controlling the flipping of the metal louvers.

[0018] Preferably, the metal side plates include a metal inner side plate and a metal outer side plate; the outer edges of the metal outer side plate and the metal inner side plate are provided with protruding platform teeth and are in a shape of undulating, used to match the undulating arrangement shape of the metal louvers in the depth direction at the opening of the cavity, forming a simple structure of the adjustable sound absorption device; the length of the metal louvers is equal to the distance between the two metal inner side plates.

[0019] Preferably, at least one metal louver is provided between the protruding platform teeth of the two metal inner side plates on both sides. Different numbers of metal louvers are arranged on the platform teeth, increasing the irregularity of the undulating state of the surface of the panel assembly, thereby increasing the sound diffusion performance of the panel assembly of the adjustable sound absorption device.

[0020] Preferably, the two sides of the metal louver are respectively provided with a first hook-shaped part and a second hook-shaped part; the shapes of the first hook-shaped part and the second hook-shaped part cooperate with each other, so that when the metal louver covers the opening, the first hook-shaped part and the second hook-shaped part of adjacent metal louvers overlap each other. The matching structure of the first hook-shaped part and the second hook-shaped part enables that when two adjacent metal louvers are in a connected state, they can be completely closed.

[0021] Preferably, the sound absorption assembly includes a metal perforated plate and a fireproof sound absorption filling arranged between the metal perforated plate and the metal base. The fireproof sound absorption filling is A-level non-combustible glass wool with a sandwich structure or rock wool with a sandwich structure. The perforation rate of the metal perforated plate is 10% - 40%. The structure of the perforated sound absorption plate is simple and practical. By adjusting the materials of each structure of the perforated sound absorption plate, the sound absorption assembly meets the A-level fire protection requirements. The material cost of the sandwich structure rock wool is low and the sound absorption effect is excellent.

[0022] Preferably, a polygonal fixed shaft hole is provided in the axial direction of the metal louver, and the fixing part of the metal louver is a fixing bolt. The fixing bolt is detachably arranged in the polygonal fixed shaft hole; a polygonal fixing hole is provided at the other end of the fixing member. The fixing bolt passes through the polygonal fixed shaft hole and the polygonal fixing hole to connect the fixing member with the metal louver; one end of the fixing member is hinged to the transmission valve bar. When the transmission valve bar moves, the fixing member rotates relative to the transmission valve bar, and the fixing member drives the metal louver to rotate.

[0023] Preferably, one side of the metal louver is a flat surface, and the other side is an arc surface or a conical surface. The material of the metal louver is a metal material that meets Class A fire protection requirements, so that the metal louver meets the Class A fire protection requirements. In the structural design of the metal louver, one side is a flat surface and the other side is an arc surface or a conical surface. During installation, the installation orientation of the metal louver can be adjusted, so that the overall appearance of the adjustable sound absorption device can be selected between the arc surface or the conical surface and the flat surface. Independent of the overall undulating structure of the metal louver and the metal profile plate, the design of the other side of the metal louver as an arc surface or a conical surface can improve the sound diffusion performance of the single metal louver.

[0024] Preferably, the metal louver is a hollow structure, and reinforcing ribs are provided between the one side and the other side of the metal louver. This saves material usage while meeting the strength requirements of the metal louver.

[0025] During a literary performance, multiple metal louvers are assembled into a panel shape at the opening to cover the opening of the cavity, so as to increase the reverberation time parameter, make the sound saturated, and at the same time, the undulating structure on the surface of the panel assembly increases the sound diffusion performance of the panel assembly of the adjustable sound absorption device.

[0026] During a meeting, when multiple metal louvers rotate, they open the opening of the cavity, and the sound absorption component takes effect to reduce the reverberation time parameter, make the sound clear, and at the same time, the undulating structure on the surface of the panel assembly increases the sound diffusion performance of the panel assembly of the adjustable sound absorption device.

[0027] The adjustable sound absorption device provided by the present invention has the following beneficial effects:

[0028] 1. Each component of the adjustable sound absorption device meets the need for Class A fire protection on the premise of adjustable sound absorption performance;

[0029] 2. The undulating structures of the metal louvers and the metal profile plate on the surface of the panel assembly increase the sound diffusion performance of the panel assembly of the adjustable sound absorption device, and do not form harmful standing waves by gathering together back and forth.

[0030] 3. The structural setting of the transmission component enables the metal louvers in different depth directions to achieve synchronous flipping;

[0031] 4. The structure of the perforated sound absorption board is simple and practical. By adjusting the materials of the various structures of the perforated sound absorption board, the sound absorption component meets the Class A fire protection requirements;

[0032] 5. During installation, the installation orientation of the metal louver can be adjusted, so that the overall appearance of the adjustable sound absorption device can be selected between the arc surface or the conical surface and the flat surface; independent of the overall undulating structure of the metal louver and the metal profile plate, the design of the other side of the metal louver as an arc surface or a conical surface can improve the sound diffusion performance of the single metal louver;

[0033] 6. By flipping the metal louvers, the adjustable sound absorption device can adjust the reverberation time parameter. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Schematic diagram of the adjustable sound absorption device with the metal louvers of the present invention in the open state;

[0035] Figure 2 Schematic diagram of the state of the transmission component and the metal louvers with the metal louvers of the present invention in the open state;

[0036] Figure 3 Schematic diagram of the fixing member of the present invention;

[0037] Figure 4 Schematic diagram of the state of the transmission component with the metal louvers (hidden) of the present invention in the open state;

[0038] Figure 5 Schematic diagram of the transmission valve bar of the present invention;

[0039] Figure 6 Schematic diagram of the adjustable sound absorption device with the metal louvers of the present invention in the assembled state;

[0040] Figure 7 Schematic diagram of the state of the transmission component and the metal louvers with the metal louvers of the present invention in the assembled state;

[0041] Figure 8 Schematic diagram of the state of the transmission component with the metal louvers (hidden) of the present invention in the assembled state;

[0042] Figure 9 Schematic diagram of the metal louvers and the fixing bolts of the present invention;

[0043] Figure 10 Cross-sectional schematic diagram of the metal louvers of the present invention;

[0044] Figure 11 Schematic diagram of the structure of the metal side plates on both sides of the present invention;

[0045] Figure 12 Schematic diagram of the positional relationship between the metal profile plate and the sound absorption component with the metal louvers of the present invention in the assembled state;

[0046] Figure 13 Schematic diagram of the positional relationship between the metal profile plate and the sound absorption component with the metal louvers of the present invention in the open state;

[0047] Figure 14 Structural relationship of the metal louvers on the metal side plates in Example 2

[0048] Reference Numerals: 100 - Adjustable Sound Absorbing Device, 1 - Metal Base, 11 - Metal Side Plate, 111 - Metal Inner Side Plate, 112 - Metal Outer Side Plate, 113 - Platform Tooth, 2 - Metal Profile Plate, 3 - Metal Louver, 31 - Polygonal Fixed Axis Hole, 32 - First Hook Portion, 33 - Second Hook Portion, 4 - Fixed Bolt, 51 - Metal Perforated Plate, 52 - Fireproof Sound Absorbing Filling, 6 - Panel Assembly, 7 - Transmission Assembly, 71 - Output Gear, 72 - Transmission Rack, 73 - Metal Connector, 74 - Transmission Valve Strip, 741 - Connection Point, 75 - Fixing Member, 751 - Polygonal Fixed Hole. Detailed Description of the Invention

[0049] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0050] Embodiment 1

[0051] As Figure 1 and 6 shown, an A - class fire - proof adjustable sound absorbing device, the adjustable sound absorbing device 100 includes a metal base 1, a sound absorbing component, a panel assembly 6 and a transmission assembly 7.

[0052] As Figure 2-8 shown, the metal base 1 includes a cavity with an opening, and the metal base 1 includes metal side plates 11 on both sides.

[0053] The sound absorbing component is composed of fire - proof materials; the sound absorbing component is arranged in the cavity; the sound absorbing component meets the A - class fire - proof requirements. When the opening is in an open state, the sound absorbing component is used for sound absorption to reduce the reverberation time.

[0054] The panel assembly 6 includes a plurality of strip - shaped metal louvers 3; the plurality of metal louvers 3 are arranged parallel to each other at the opening of the cavity and are arranged in a undulating manner along the depth direction of the cavity; the metal louvers 3 in different depth directions are separated and connected by a metal profile plate 2; both the metal louvers 3 and the metal profile plate 2 are connected and arranged between the two metal side plates 11; both ends of the metal louvers 3 are provided with fixing parts; when the plurality of metal louvers 3 are assembled into a panel shape at the opening, they cover the opening of the cavity, and when the plurality of metal louvers 3 rotate, they open the opening of the cavity; the undulating structure formed by the metal louvers 3 and the metal profile plate 2 can increase the sound diffusion performance. Only the presence of the metal profile plate 2 can completely close the opening of the cavity when the metal louvers 3 are in an assembled state.

[0055] The transmission assembly 7 drives the metal louvers 3 to flip. The transmission assembly 7 includes a transmission valve bar 74, a fixing member 75 and a driving portion. The driving portion drives the transmission valve bar 74 to move; there are multiple fixing members 75; the transmission valve bar 74 is provided with connection points 741 matching the fixing portions of the metal louvers 3; the relative positions between each connection point 741 are the same as the relative positions between each metal louver 3. One end of the fixing member 75 is rotatably connected to the connection point 741 of the transmission valve bar 74, and the other end of the fixing member 75 is connected to the fixing portion of the metal louver 3. Only when the positions of the connection points 741 on the transmission valve bar 74 meet the above requirements, the metal louvers 3 in different depth directions can achieve synchronous flipping. When the metal louvers 3 are flipped, the angle between the fixing member 75 and the metal louvers 3 remains unchanged, and the flipping of the metal louvers 3 is achieved through the rotation of the fixing member 75.

[0056] When the metal louvers 3 are in the assembled state, the undulating structures of the metal louvers 3 and the metal profile plates 2 on the surface of the panel assembly 6 increase the sound diffusion performance of the panel assembly 100 of the adjustable sound absorption device, so that the sound diffuses and does not gather back and forth to form harmful standing waves. The structural setting of the transmission assembly 7 enables the metal louvers 3 in different depth directions to achieve synchronous flipping.

[0057] The driving portion includes a motor, a transmission rack 72 and a metal connecting member 73. The motor includes an output gear 71. The output gear 71 meshes with the transmission rack 72 and drives the transmission rack 72; one end of the metal connecting member 73 is rotatably connected to the transmission rack 72, and the other end of the metal connecting member 73 is rotatably connected to the transmission valve bar 74. The position of the transmission rack 72 remains unchanged in the depth direction of the cavity. By controlling the operation of the motor, the output gear 71 of the motor drives the transmission valve bar 74 to reciprocate, thereby controlling the flipping of the metal louvers 3.

[0058] As Figure 11 shown, the metal side plate 11 includes a metal inner side plate 111 and a metal outer side plate 112; the outer edges of the metal outer side plate 112 and the metal inner side plate 111 are provided with protruding platform teeth 113 and are in a shape of high and low undulation, used to match the high and low undulating arrangement shape of the metal louvers 3 in the depth direction at the opening of the cavity, forming a simple structure of the adjustable sound absorption device 100; the length of the metal louvers 3 is equal to the distance between the two metal inner side plates 111. The transmission assembly 7 is arranged between the metal inner side plate 111 and the metal outer side plate 112.

[0059] One or two metal louvers 3 are provided between the protruding platform teeth 113 of the metal inner side plates 111 on both sides. Different numbers of metal louvers 3 are provided on the platform teeth 113, so that the undulating state of the surface of the panel assembly 6 is increased irregularly, thereby increasing the sound diffusion performance of the panel assembly 6 of the adjustable sound absorption device 100.

[0060] First hook-shaped portions 32 and second hook-shaped portions 33 are respectively provided on both sides of the metal louver 3; the shapes of the first hook-shaped portions 32 and the second hook-shaped portions 33 cooperate with each other, so that when the metal louver 3 covers the opening, the first hook-shaped portions 32 and the second hook-shaped portions 33 of the adjacent metal louvers 3 overlap each other. The matching structure of the first hook-shaped portion 32 and the second hook-shaped portion 33 enables the adjacent two metal louvers 3 to be completely closed when they are in a connected state.

[0061] The sound absorption assembly includes a metal perforated plate 51 and a fireproof sound absorption filler 52 provided between the metal perforated plate 51 and the metal base 1. The fireproof sound absorption filler 52 is A-level non-combustible glass wool with a sandwich structure or rock wool with a sandwich structure. The perforation rate of the metal perforated plate 51 is 10% - 40%. The structure of the perforated sound absorption plate is simple and practical. By adjusting the materials of the various structures of the perforated sound absorption plate, the sound absorption assembly meets the A-level fire protection requirements. The material cost of the sandwich structure rock wool is low, and the sound absorption effect is excellent.

[0062] As Figure 9 shown, a polygonal fixed shaft hole 31 is provided in the axial direction of the metal louver 3. The fixing part of the metal louver 3 is a fixing bolt 4. The fixing bolt 4 is detachably arranged in the polygonal fixed shaft hole 31; a polygonal fixing hole 751 is provided at the other end of the fixing member 75. The fixing bolt 4 passes through the polygonal fixed shaft hole 31 and the polygonal fixing hole 751 to connect the fixing member 75 and the metal louver 3; one end of the fixing member 75 is hinged to the transmission valve bar 74. When the transmission valve bar 74 moves, the fixing member 75 rotates relative to the transmission valve bar 74, and the fixing member 75 drives the metal louver 3 to rotate.

[0063] As Figure 10 shown, one side of the metal louver 3 is a plane, and the other side is a curved surface. The material of the metal louver 3 is a metal material that meets A-level fire protection requirements, so that the metal louver 3 meets A-level fire protection requirements. In the structural design of the metal louver 3, one side is a plane and the other side is a curved surface. During installation, the installation orientation of the metal louver 3 can be adjusted, so that the overall appearance of the adjustable sound absorption device 100 can be selected between the curved surface and the plane. Independent of the overall undulating structure of the metal louver 3 and the metal profile plate 2, the curved surface design on the other side of the metal louver 3 can improve the sound diffusion performance of the metal louver 3 monomer.

[0064] The metal louver 3 has a hollow structure, and reinforcing ribs are provided between the one side and the other side of the metal louver 3. This saves material usage while meeting the strength requirements of the metal louver 3.

[0065] As Figure 12 shown, it is a schematic diagram of the positional relationship between the metal profile plate and the sound absorption component when the metal louver of the present invention is in the assembled state, that is, in the state with a longer reverberation time. The sound absorption component is enclosed, resulting in a longer reverberation time.

[0066] As Figure 13 shown, it is a schematic diagram of the positional relationship between the metal profile plate and the sound absorption component when the metal louver of the present invention is in the open state, that is, in the state with a shorter reverberation time. The sound absorption component is exposed, resulting in a shorter reverberation time.

[0067] During a literary performance, multiple metal louvers 3 are assembled into a panel shape at the opening to cover the opening of the cavity, so as to increase the reverberation time parameter, making the sound saturated. At the same time, the undulating structure on the surface of the panel assembly 6 increases the sound diffusion performance of the panel assembly 6 of the adjustable sound absorption device 100.

[0068] During a meeting, when multiple metal louvers 3 rotate to open the opening of the cavity, the sound absorption component takes effect to reduce the reverberation time parameter, making the sound clear. At the same time, the undulating structure on the surface of the panel assembly 6 increases the sound diffusion performance of the panel assembly 6 of the adjustable sound absorption device 100.

[0069] Embodiment 2

[0070] The difference between Embodiment 2 and Embodiment 1 is that there is one metal louver 3 between the protruding platform teeth 113 of the metal inner side plates 111 on both sides. There are two metal louvers 3 on the metal inner side plates 111 between the platform teeth 113 on the same side. The arrangement of the above metal louvers 3 increases the appearance neatness of the undulating state on the surface of the panel assembly 6. The sound diffusion performance of the panel assembly 6 of the adjustable sound absorption device 100 is slightly lower than that of Embodiment 1, but the overall appearance neatness increases.

[0071] Embodiment 3

[0072] The difference between Embodiment 3 and Embodiment 1 lies in that, different from the specific structure of the driving part in Embodiment 1, the driving structure is an electric push rod (not shown in the figure). One end of the electric push rod is movably connected to the transmission valve bar 74. By controlling the extension and contraction of the electric push rod, the transmission valve bar 74 reciprocates, thereby controlling the flipping of the metal louver 3.

[0073] The terms "first", "second" and similar terms used in the description and claims do not denote any order, quantity or importance, but are merely used to distinguish different components. Similarly, the terms "a", "an" or "the" and similar terms do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "comprising", "including" or similar terms mean that the elements or items appearing before "comprising" or "including" cover the elements or items listed after "comprising" or "including" and their equivalents, and do not exclude other elements or items. The terms "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationships may also change accordingly.

[0074] The embodiments are only a single implementation mode of the present invention. For those of ordinary skill in the art, without creative efforts, other embodiments can also be obtained according to the drawings and are also within the protection scope of the present invention.

Claims

1. An adjustable sound-absorbing device with Class A fire protection, characterized in that, The adjustable sound-absorbing device includes: A metal base, the metal base includes a cavity with an opening, and the metal base includes metal side plates on both sides; A sound-absorbing component, the sound-absorbing component is composed of a fireproof material; the sound-absorbing component is arranged in the cavity; A panel component, the panel component includes a plurality of strip-shaped metal louvers; the plurality of metal louvers are arranged parallel to each other at the opening of the cavity and are arranged in a undulating manner along the depth direction of the cavity; a metal profile plate is separably connected between the metal louvers in different depth directions; both the metal louvers and the metal profile plate are connected and arranged between the two metal side plates; both ends of the metal louvers are provided with fixing parts; when the plurality of metal louvers are assembled into a panel shape at the opening, the opening of the cavity is covered, and when the plurality of metal louvers rotate, the opening of the cavity is opened; A transmission component, the transmission component drives the metal louvers to flip; The transmission component includes a transmission valve bar, fixing parts and a driving part, the driving part drives the transmission valve bar to move; there are a plurality of the fixing parts; the transmission valve bar is provided with connection points matching the fixing parts of the metal louvers; the relative positions between each connection point are the same as the relative positions between each metal louver, one end of the fixing part is rotatably connected to the connection point of the transmission valve bar, and the other end of the fixing part is connected to the fixing part of the metal louver; The driving part includes a motor, a transmission rack and a metal connecting piece, the motor includes an output gear, the output gear meshes with the transmission rack and drives the transmission rack; one end of the metal connecting piece is rotatably connected to the transmission rack, the other end of the metal connecting piece is rotatably connected to the transmission valve bar, and the transmission rack does not change its position in the depth direction of the cavity; The metal side plate includes a metal inner side plate and a metal outer side plate; the outer edges of the metal outer side plate and the metal inner side plate are provided with protruding platform teeth and are in a undulating shape; the length of the metal louver is equal to the distance between the two metal inner side plates.

2. The adjustable sound-absorbing device according to claim 1, characterized in that, There is at least one metal louver between the protruding platform teeth of the metal inner side plates on both sides.

3. The adjustable sound-absorbing device according to claim 1, characterized in that, Both sides of the metal louver are respectively provided with a first hook-shaped part and a second hook-shaped part; the shapes of the first hook-shaped part and the second hook-shaped part cooperate with each other, so that when the metal louver covers the opening, the first hook-shaped part and the second hook-shaped part of adjacent metal louvers overlap each other.

4. The adjustable sound-absorbing device according to claim 1, characterized in that, The sound-absorbing component includes a metal perforated plate and a fireproof sound-absorbing filling arranged between the metal perforated plate and the metal base, the fireproof sound-absorbing filling is A-level non-combustible glass wool with a sandwich structure or rock wool with a sandwich structure, and the perforation rate of the metal perforated plate is 10% - 40%.

5. The adjustable sound-absorbing device according to claim 1, characterized in that, A polygonal fixed shaft hole is provided in the axial direction of the metal louver, the fixing part of the metal louver is a fixing bolt, and the fixing bolt is detachably arranged in the polygonal fixed shaft hole; a polygonal fixing hole is provided at the other end of the fixing part, and the fixing bolt passes through the polygonal fixed shaft hole and the polygonal fixing hole to connect the fixing part and the metal louver; the one end of the fixing part is hinged to the transmission valve bar.

6. The adjustable sound-absorbing device according to claim 1, characterized in that, One side of the metal louver is a flat surface, and the other side is an arc surface or a conical surface.

7. The adjustable sound-absorbing device according to claim 6, characterized in that, The metal louver is a hollow structure, and reinforcing ribs are arranged between the one side and the other side of the metal louver.

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