A silent device

Abstract

The present invention discloses a mute device, which is characterized by comprising an outer frame, an inner frame and a mute structure, wherein the outer frame is provided with an outer sound insulation layer, an outer barrier layer and an outer protective layer, wherein the outer sound insulation layer, the outer barrier layer and the outer protective layer are sequentially stacked from the inside to the outside, and the inner frame is provided with an inner sound insulation layer, an inner barrier layer and an inner protective layer, wherein the inner sound insulation layer, the inner barrier layer and the inner protective layer are sequentially stacked from the outside to the inside, the outer sound insulation layer is a sound absorbing material, the inner sound insulation layer is hollow inside and is provided with a second The load-bearing frame has a spacing between each support rod, and the spacing is filled with potting glue. The present invention also fills the inner sound insulation layer with potting glue, and the potting glue includes a potting glue main agent YH-9012A and a potting glue auxiliary agent YH-9012B, wherein the weight ratio of the potting glue main agent YH-9012A and the potting glue auxiliary agent YH-9012B is 5:1, which has an unexpected sound insulation effect. The present invention has the characteristics of long service life, strong load-bearing capacity, and easy installation.

Description

Technical Field

[0001] The present invention relates to the field of mute, and in particular to a mute device. Background Art

[0002] From the perspective of market demand, sound insulation boxes have been widely used in various industries, including automobile manufacturing, electronics, construction and other fields. In particular, the demand for sound insulation boxes is even stronger in places that require a highly silent environment, such as laboratories, recording studios, and hospital operating rooms.

[0003] In terms of materials used, soundproof boxes usually use a variety of materials to achieve good sound insulation effects. Among them, common materials include:

[0004] Soundproofing: Utilizing advanced and unique patented technology, ultra-fine glass fibers dissipate significant amounts of sound energy as it passes through, converting more into heat, providing insulation and soundproofing for partitions and walls. Widely used, it resists solidification, shrinkage, or collapse even in ordinary construction applications, boasts exceptional sound absorption, and is non-toxic and harmless.

[0005] Soundproofing panels: Crafted with a high-strength gypsum core, the panels increase the bubble content, reduce the diameter of the foam, and increase the toughness and density of the face paper. They offer excellent sound insulation, are environmentally friendly, waterproof, UV-resistant, heat-resistant, and easy to install.

[0006] Sound insulation pad: It is a high-quality foam product with a closed-cell structure and low density. It can control and buffer the propagation of sound and vibration, and can effectively block the penetration of water, air and dust in the link structure.

[0007] Transparent acrylic and sheet metal are also commonly used materials for soundproofing enclosures. Transparent acrylic not only blocks dust and noise but also allows workers to clearly see the equipment's trajectory, facilitating timely detection of any issues. Sheet metal, on the other hand, comes in a variety of colors, provides excellent sound insulation, and can be perforated to dissipate heat as needed, making it both practical and aesthetically pleasing.

[0008] However, the existing sound insulation devices on the market can only reduce the sound insulation effect from more than 70 decibels to about 20 decibels at most. The sound insulation effect is average and the production cost is high. How to develop a silent device with better sound insulation effect and lower production cost is a difficult problem that technical personnel in this field urgently need to solve. Summary of the Invention

[0009] The object of the present invention is to provide a mute device to solve the problems raised in the above background technology.

[0010] To achieve the above object, the present invention provides the following technical solutions:

[0011] Provided is a mute device comprising an outer frame, an inner frame and a mute structure;

[0012] The outer frame and the inner frame are both provided with equipment doors, namely the outer door and the inner door, and the opening directions of the outer door and the inner door are consistent; a third cavity is provided in the outer frame, the outer frame and the outer door form a closed space, the inner frame is fixed in the closed space formed by the outer frame and the outer door, the inner frame is provided with a first cavity, and the inner frame and the inner door form a closed space, the first cavity is the final sound insulation detection room, and the sound absorbing structure is fixed between the outer frame and the inner frame;

[0013] The outer frame is provided with an outer sound insulation layer, an outer barrier layer and an outer protective layer, and the outer sound insulation layer, the outer barrier layer and the outer protective layer are stacked in sequence from the inside to the outside; the inner frame is provided with an inner sound insulation layer, an inner barrier layer and an inner protective layer, and the inner sound insulation layer, the inner barrier layer and the inner protective layer are stacked in sequence from the outside to the inside; the outer sound insulation layer is a sound-absorbing material; the inner sound insulation layer is hollow inside and is provided with a second load-bearing frame; each support rod has a spacing space, and the spacing space is filled with potting glue.

[0014] Furthermore, the potting glue includes a potting glue main agent YH-9012A and a potting glue auxiliary agent YH-9012B, wherein the weight ratio of the potting glue main agent YH-9012A to the potting glue auxiliary agent YH-9012B is 5:1.

[0015] Furthermore, the second load-bearing frame is fixed on the outside of the inner barrier layer. The second load-bearing frame is provided with 10 support rods. Except for the equipment door connection surface, the other five surfaces of the inner barrier layer are provided with two parallel and spaced support rods.

[0016] Furthermore, the wall of each support rod of the second load-bearing frame is provided with support holes, and the support holes are circular through-holes and are evenly distributed on the wall of the support rod.

[0017] Furthermore, the silencer structure includes a silencer frame and a silencer rack. The silencer rack is fixed on the edge of the silencer frame and protrudes from the wall of the silencer frame. The silencer holes are evenly arranged on the outer wall of the silencer frame, and the silencer holes are circular perforations.

[0018] Furthermore, it includes a ventilation pipe, the inner frame is provided with a first cavity and a second cavity, the first cavity is connected to the second cavity, one end of the ventilation pipe is connected to the first cavity, and the other end of the ventilation pipe is connected to the air outside the equipment.

[0019] Furthermore, the outer frame, the sound-absorbing structure and the inner frame are all provided with outer through holes, middle through holes and inner through holes corresponding to the ventilation pipes, and an isolation net is provided on the outer wall of the outer frame at positions corresponding to the outer through holes.

[0020] Furthermore, the outer door is provided with a first door protective layer, a first door barrier layer and a first door sound insulation layer, which correspond to the outer protective layer, the outer barrier layer and the outer sound insulation layer respectively. The first door barrier layer is provided with an inwardly convex step, and the outer barrier layer is provided with a corresponding inwardly concave step.

[0021] Furthermore, the inner door is provided with a second door protection layer, a second door barrier layer and a second door sound insulation layer, which correspond to the inner sound insulation layer, the inner barrier layer and the inner protection layer respectively. The second door barrier layer is provided with an inwardly convex step, and the inner barrier layer is provided with a corresponding inwardly concave step.

[0022] The cam is fixed to the outer surface of the frame, and the cam is fixed to the outer surface of the frame, and the cam is fixed to the outer surface of the frame, wherein the cam is fixed to the outer surface of the frame, wherein the cam is fixed to the outer surface of the frame, and the cam is fixed to the outer surface of the frame.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention is provided with a two-layer sound insulation structure of an inner frame and an outer frame. The outer frame is provided with an outer sound insulation layer, an outer barrier layer and an outer protective layer. The inner frame is provided with an inner sound insulation layer, an inner barrier layer and an inner protective layer. The present invention also fills the inner sound insulation layer with potting glue, and the potting glue includes a potting glue main agent YH-9012A and a potting glue auxiliary agent YH-9012B. The weight ratio of the potting glue main agent YH-9012A and the potting glue auxiliary agent YH-9012B is 5:1, which has an unexpected sound insulation effect. A soundproofing structure is also provided on the inner side of the outer frame. After multiple layers of soundproofing effect, the volume can be reduced from more than 70 decibels from the outside to 6 decibels, which greatly improves the sound insulation effect of the sound insulation device, and the production cost is low, which is suitable for market price. The present invention has the characteristics of small space occupation, good sound insulation effect and low production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is the overall structural diagram of the mute device of the present invention;

[0026] Figure 2 This is a structural diagram of the mute frame of the mute device of the present invention;

[0027] Figure 3 This is a diagram of the inner frame structure of the mute device of the present invention;

[0028] Figure 4 This is a diagram showing the internal structure of the outer frame of the mute device of the present invention;

[0029] Figure 5 This is a structural diagram of the inner frame bottom of the mute device of the present invention;

[0030] Figure 6 This is a diagram showing the internal structure of the inner frame of the mute device of the present invention;

[0031] Figure 7 is a cross-sectional view of the mute device of the present invention;

[0032] Figure 8 This is a structural diagram of the base of the mute device of the present invention;

[0033] Figure 9 This is a base connection diagram of the mute device of the present invention;

[0034] Figure 10 This is a structural diagram of the second load-bearing frame of the mute device of the present invention;

[0035] Figure 11 This is an internal structural diagram of the mute device of the present invention;

[0036] The components in the accompanying drawings are marked as follows: 1 outer frame; 11 outer body; 111 outer sound insulation layer; 112 outer barrier layer; 113 outer protective layer; 114 outer bottom protective layer; 12 outer door; 121 first door protective layer; 122 first door barrier layer; 123 first door sound insulation layer; 13 outer hinge; 14 outer lock; 15 hook; 16 outer through hole; 17 isolation net; 18 third cavity; 2 inner frame; 21 inner body; 211 inner protective layer; 212 inner barrier layer; 213 inner sound insulation layer; 2131 storage table; 2132 inner step; 214 concave sheath; 22 inner door; 221 second door protective layer; 222 second door barrier layer; 223 second door sound insulation layer; 23 inner hinge; 24 inner lock; 25 fixing plate; 26 inner through hole; 27 first cavity; 28 second cavity; 3 silencer structure; 31 silencer frame; 311 silencer frame; 312 silencer hole; 32 middle through hole; 4 base; 41 first load-bearing frame; 411 first load-bearing seat; 412 first limiting device; 4121 inner limiting device; 4122 outer limiting device; 41211 limiting plate; 41212 limiting block; 413 seat body; 4131 lower seat body; 4132 middle seat body; 4133 upper seat body; 42 pulley; 43 second load-bearing seat; 5 supporting structure; 51 protrusion; 52 load-bearing column; 53 load-bearing platform; 54 second limiting device; 6 second load-bearing frame; 61 support rod; 62 support hole; 7 ventilation pipe. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] See also Figures 1-11 , providing a mute device, comprising an outer frame 1, an inner frame 2 and a mute structure 3;

[0039] The outer frame 1 and the inner frame 2 are both provided with equipment doors, namely, an outer door 12 and an inner door 22, and the opening directions of the outer door 12 and the inner door 22 are the same; a third cavity 18 is provided in the outer frame 1, and the outer frame 1 and the outer door 12 form a closed space, and the inner frame 2 is fixed in the closed space formed by the outer frame 1 and the outer door 12, and the inner frame 2 is provided with a first cavity 27, and the inner frame 2 and the inner door 22 form a closed space, and the first cavity 27 is the final sound insulation detection room, and the sound-absorbing structure 3 is fixed between the outer frame 1 and the inner frame 2, and the outer door 12 and the inner door 22 are respectively fixed to the outer body 11 and the inner body 21 by the outer hinge 13 and the inner hinge 23. Relatively, the outer frame 1 and the inner frame 2 are also provided with an outer lock 14 and an inner lock 24, and the outer door 12 and the inner door 22 are controlled to be opened and closed by the outer lock 14 and the inner lock 24;

[0040] The outer frame 1 is provided with an outer sound insulation layer 111, an outer barrier layer 112 and an outer protective layer 113, and the outer sound insulation layer 111, the outer barrier layer 112 and the outer protective layer 113 are stacked in sequence from the inside to the outside. The inner frame 2 is provided with an inner sound insulation layer 213, an inner barrier layer 212 and an inner protective layer 211, and the inner sound insulation layer 213, the inner barrier layer 212 and the inner protective layer 211 are stacked in sequence from the outside to the inside. The outer sound insulation layer 111 is a sound absorbing material, and the inner sound insulation layer 213 is hollow inside and has an inner The second load-bearing frame 6 is fixed to the outside of the inner barrier layer 212. The second load-bearing frame 6 is provided with 10 support rods 61. Except for the equipment door connection surface, the other five surfaces of the inner barrier layer 212 are each provided with two parallel and spaced support rods 61. The wall of each support rod 61 of the second load-bearing frame 6 is provided with a support hole 62. The support holes 62 are circular perforations and are evenly distributed on the wall of the support rod 61. Each support rod 61 has a space between them, and the space is filled with potting glue.

[0041] Specifically, the potting compound includes a potting compound YH-9012A and a potting compound YH-9012B, wherein the weight ratio of the potting compound YH-9012A to the potting compound YH-9012B is 5:1. When the external ambient volume exceeds 70 decibels, the volume can be reduced to 6 decibels after sound insulation, and the sound insulation effect far exceeds that of ordinary sound insulation materials used in the market.

[0042] Specifically, a supporting structure 5 is provided at the bottom of the outer frame 1, and the inner frame 2 is fixed on the supporting structure 5. The supporting structure 5 includes a protrusion 51, a load-bearing column 52 and a load-bearing platform 53. The load-bearing platform 53 is fixed to the upper end of the outer bottom protective layer 114, and the load-bearing column 52 is fixed to the center position of the upper end of the load-bearing platform 53. A second limiting device 54 is further provided on the side of the upper end of the load-bearing platform 53. A protrusion 51 protrudes from the upper end of the load-bearing column 52, and the protrusion 51 can be removed from the bottom surface of the inner frame 2 and fixed thereto. The bottom surface of the inner frame 2 is provided with a concave sheath 214 corresponding to the protrusion 51. When the inner frame 2 is fixed on the load-bearing column 52, the second limiting devices 54 on both sides contact and clamp the outer side surface of the inner frame 2.

[0043] The upper surface of the outer frame 1 is provided with hooks 15, which are respectively fixed at the four ends of the upper surface of the outer frame 1 to facilitate the transportation of the equipment. The upper surface of the inner frame 2 is provided with a fixing plate 25, and the inner frame 2 can be fixed to the silencer structure 3 through the fixing plate 25.

[0044] The inner frame 2 includes a ventilation duct 7. The inner frame 2 is provided with a first cavity 27 and a second cavity 28, the first cavity 27 and the second cavity 28 being interconnected. One end of the ventilation duct 7 is connected to the first cavity 27, while the other end of the ventilation duct 7 is connected to the air outside the device. The outer frame 1, the sound-absorbing structure 3, and the inner frame 2 are each provided with an outer through-hole 16, a middle through-hole 32, and an inner through-hole 26 corresponding to the ventilation duct 7. An isolation net 17 is provided on the outer wall of the outer frame 1 at a position corresponding to the outer through-hole 16. Gas in the first cavity 27 can be exchanged with external air through the ventilation duct 7. The isolation net 17 prevents debris from entering the ventilation duct 7. The inner frame 2 is provided with a storage platform 2131 at the bottom of the second cavity 28 for convenient storage. An inner step 2132 is provided on the storage platform 2131 near the outer side of the inner door 22. When the inner door 22 is closed, the inner step 2132 aligns with the second door sound insulation layer 223, ensuring a tight seal and improving sound insulation.

[0045] See also Figure 2 Specifically, the silencer structure 3 includes a silencer frame 31 and a silencer frame 311. The silencer frame 311 is fixed on the edge of the silencer frame 31 and protrudes from the wall of the silencer frame 31. The silencer holes 312 are evenly arranged on the outer wall of the silencer frame 31, and the silencer holes 312 are circular perforations.

[0046] See also Figure 4 、 Figure 6and Figure 7 The outer door 12 is provided with a first door protection layer 121, a first door barrier layer 122, and a first door sound insulation layer 123, corresponding to the outer protection layer 113, the outer barrier layer 112, and the outer sound insulation layer 111, respectively. The first door barrier layer 122 is provided with an inwardly convex step, and the outer barrier layer 112 is provided with a corresponding inwardly concave step. The inner door 22 is provided with a second door protection layer 221, a second door barrier layer 222, and a second door sound insulation layer 223, corresponding to the inner sound insulation layer 213, the inner barrier layer 212, and the inner protection layer 211, respectively. The second door barrier layer 222 is provided with an inwardly convex step, and the inner barrier layer 212 is provided with a corresponding inwardly concave step. The progressive steps improve the sealing of the device door, significantly reduce the sound volume entering from the outside, and enhance the device's sound insulation effect.

[0047] See also Figure 7-Figure 9 , including a base 4, the base 4 is fixed to the lower surface of the outer frame 1, the base 4 includes a first load-bearing frame 41, a pulley 42 and a second load-bearing seat 43, the upper surface of the first load-bearing frame 41 is provided with a first load-bearing seat 411, the first load-bearing seat 411 is in contact with the lower end of the outer bottom protective layer 114 of the outer frame 1, the first load-bearing frame 41 is provided with a first limiting device 412 and a seat body 413, the first limiting device 412 is respectively fixed to the four ends of the upper surface of the seat body 413, the first limiting device 412 includes an inner limiting device 4121 and an outer limiting device 4122, the two inner limiting devices 4121 and the two outer limiting devices 4122 are respectively fixed to the seat body On the same side of the upper surface of the 413 frame, the inner limiting device 4121 is provided with a limiting piece 41211 and a limiting block 41212. The two outer sides of the limiting block 41212 are flush with the outer side of the seat body 413. The limiting piece 41211 is fixed on an outer side of the limiting block 41212, and the inner side of the limiting piece 41211 is flush with the outer side of the seat body 413. The outer limiting device 4122 is composed of two vertical triangular pieces to form a protruding slot. The two triangular pieces are respectively fixed to the outer sides of adjacent seat bodies 413. The pulley 42 is fixed to the four ends of the lower surface of the first load-bearing frame 41, and the second load-bearing seat 43 is fixed to the lower surface of the first load-bearing frame 41 and at the inner side of the pulley 42.

[0048] Specifically, the seat body 413 is divided into a lower seat body 4131, a middle seat body 4132 and an upper seat body 4133. The upper seat body 4133 is a square frame, and the inner side of the square frame is provided with two horizontal and three vertical cross frames, and the horizontal bars and vertical bars are evenly spaced. The middle seat body 4132 is composed of multiple vertical bars, the upper ends of the vertical bars are fixed to the frame of the upper seat body 4133, and the lower ends of the vertical bars are fixed to the frame of the lower seat body 4131. The lower seat body 4131 is a square frame corresponding to the upper seat body 4133, and the lower seat body 4131 is provided with a cross-cross bar on the inner side of the square frame. The cross intersection is preferably the center point of the square frame, and the upper seat body 4133 is provided with a center intersection corresponding to it and perpendicular to it, and the middle seat body 4132 is provided with a vertical bar with both ends fixed to the cross intersection and the center intersection of the upper seat body 4133 respectively. The stability of the base 4 is improved by the multi-rod structure, which has a promoting effect on the stability of high-weight equipment.

[0049] The present invention is provided with a two-layer sound insulation structure of an inner frame 2 and an outer frame 1. The outer frame 1 is provided with an outer sound insulation layer 111, an outer barrier layer 112 and an outer protective layer 113. The inner frame 2 is provided with an inner sound insulation layer 213, an inner barrier layer 212 and an inner protective layer 211. The present invention is also provided with a potting glue in the inner sound insulation layer 213. The potting glue includes a potting glue main agent YH-9012A and a potting glue auxiliary agent YH-9012B. The weight ratio of the potting glue main agent YH-9012A and the potting glue auxiliary agent YH-9012B is 5:1, which has an unexpected sound insulation effect. A sound insulation structure 3 is also provided on the inner side of the outer frame 1. After multiple layers of sound insulation effect, the volume can be reduced from more than 70 decibels from the outside to 6 decibels, which greatly improves the sound insulation effect of the sound insulation device. In addition, the production cost is low and suitable for market prices. The present invention has the characteristics of small space occupation, good sound insulation effect and low production cost.

[0050] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A mute device, characterized in that: It comprises an outer frame (1), an inner frame (2) and a sound-absorbing structure (3); The outer frame (1) and the inner frame (2) are both provided with equipment doors, namely the outer door (12) and the inner door (22), the outer frame (1) is provided with a third cavity (18), the outer frame (1) and the outer door (12) form a closed space, the inner frame (2) is fixed in the closed space formed by the outer frame (1) and the outer door (12), the inner frame (2) is provided with a first cavity (27), and the inner frame (2) and the inner door (22) form a closed space, the first cavity (27) is the final sound insulation detection room, and the sound absorbing structure (3) is fixed between the outer frame (1) and the inner frame (2); The outer frame (1) is provided with an outer sound insulation layer (111), an outer barrier layer (112) and an outer protective layer (113), and the outer sound insulation layer (111), the outer barrier layer (112) and the outer protective layer (113) are sequentially stacked from the inside to the outside; the inner frame (2) is provided with an inner sound insulation layer (213), an inner barrier layer (212) and an inner protective layer (211), and the inner sound insulation layer (213), the inner barrier layer (212) and the inner protective layer (211) are sequentially stacked from the outside to the inside; the outer sound insulation layer (111) is a sound absorbing material; the inner sound insulation layer (213) is hollow inside and is provided with a second load-bearing frame (6); each support rod (61) leaves a spacing space, and the spacing space is filled with potting glue; A supporting structure (5) is further provided on the outer frame (1) and between the outer frame (1) and the bottom of the inner frame (2), the supporting structure (5) comprising a load-bearing column (52) and a load-bearing platform (53), the load-bearing platform (53) being fixed to the upper end of the outer bottom protective layer (114), the load-bearing column (52) being fixed to the load-bearing platform (53), and the inner frame (2) being fixed to the load-bearing column (52); The potting glue comprises a potting glue main agent YH-9012A and a potting glue auxiliary agent YH-9012B, wherein the weight ratio of the potting glue main agent YH-9012A to the potting glue auxiliary agent YH-9012B is 5:1; The muffler structure (3) comprises a muffler frame (31) and a muffler frame (311). The muffler frame (311) is fixed on the edge of the muffler frame (31) and protrudes from the wall surface of the muffler frame (31). The outer wall of the muffler frame (31) is evenly provided with muffler holes (312).

2. The mute device according to claim 1, characterized in that: The second load-bearing frame (6) is fixed on the outside of the inner barrier layer (212), and the second load-bearing frame (6) is provided with 10 support rods (61). Except for the equipment door connection surface, the other five surfaces of the inner barrier layer (212) are each provided with two parallel and spaced support rods (61).

3. The mute device according to claim 2, characterized in that: The rod wall of each support rod (61) of the second load-bearing frame (6) is provided with a support hole (62), and the support holes (62) are circular through-holes and are evenly distributed on the rod wall of the support rod (61).

4. The mute device according to claim 1, characterized in that: The muffler hole (312) is a circular perforation.

5. The mute device according to claim 1, characterized in that: The invention comprises a ventilation pipe (7), wherein the inner frame (2) is provided with a first cavity (27) and a second cavity (28), wherein the first cavity (27) and the second cavity (28) are connected, one end of the ventilation pipe (7) is connected to the first cavity (27), and the other end of the ventilation pipe (7) is connected to the air outside the equipment.

6. The mute device according to claim 5, characterized in that: The outer frame (1), the sound-absorbing structure (3) and the inner frame (2) are all provided with an outer through hole (16), a middle through hole (32) and an inner through hole (26) corresponding to the ventilation pipe (7); an isolation net (17) is provided on the outer wall of the outer frame (1) at a position corresponding to the outer through hole (16).

7. The mute device according to claim 1, characterized in that: The outer door (12) is provided with a first door protection layer (121), a first door barrier layer (122) and a first door sound insulation layer (123), which correspond to the outer protection layer (113), the outer barrier layer (112) and the outer sound insulation layer (111) respectively; the first door barrier layer (122) is provided with an inwardly convex step, and the outer barrier layer (112) is provided with a corresponding inwardly concave step.

8. The mute device according to claim 1, characterized in that: The inner door (22) is provided with a second door protection layer (221), a second door barrier layer (222) and a second door sound insulation layer (223), which correspond to the inner sound insulation layer (213), the inner barrier layer (212) and the inner protection layer (211) respectively; the second door barrier layer (222) is provided with an inwardly convex step, and the inner barrier layer (212) is provided with a corresponding inwardly concave step.

9. The mute device according to claim 1, characterized in that: The invention comprises a base (4), wherein the base (4) is fixed on the lower surface of the outer frame (1), the base (4) comprises a first load-bearing frame (41), a pulley (42) and a second load-bearing seat (43), the upper surface of the first load-bearing frame (41) is provided with a first load-bearing seat (411), the first load-bearing seat (411) abuts against the lower end of the outer bottom protective layer (114) of the outer frame (1), the first load-bearing frame (41) is provided with a first limiting device (412) and a seat body (413), the first limiting device (412) is respectively fixed to the four ends of the upper surface of the seat body (413), the first limiting device (412) comprises an inner limiting device (4121) and an outer limiting device (4122), the two inner limiting devices (4121) and the two outer limiting devices (4122) are respectively fixed On the same side of the upper surface of the seat body (413) frame, the inner limiting device (4121) is provided with a limiting piece (41211) and a limiting block (41212), both outer sides of the limiting block (41212) are flush with the outer side of the seat body (413), the limiting piece (41211) is fixed on an outer side of the limiting block (41212), and the inner side of the limiting piece (41211) is flush with the outer side of the seat body (413), the outer limiting device (4122) is a protruding slot formed by two vertical triangular pieces, and the two triangular pieces are respectively fixed to the outer sides of adjacent seat bodies (413), the pulley (42) is fixed to the four ends of the lower surface of the first load-bearing frame (41), and the second load-bearing seat (43) is fixed to the lower surface of the first load-bearing frame (41) and at the inner side of the pulley (42).

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