Acoustic performance test device and test box

Abstract

The present disclosure relates to an acoustic performance test device and a test box thereof, wherein the test box comprises an outer box body and an inner box body arranged inside the outer box body, the inner box body comprises a plurality of inner box panels, the plurality of inner box panels together enclose a test cavity, each inner box panel comprises a first sound insulation panel and a first sound absorption panel, the first sound insulation panel and the first sound absorption panel are arranged along the thickness direction of the inner box panel, the test box further comprises a flip mechanism arranged one by one corresponding to the plurality of inner box panels, each inner box panel is flipably connected to the outer box body through the corresponding flip mechanism, so that the first sound insulation panel or the first sound absorption panel can be selectively directed toward the test cavity. Since the test box is provided with a flippable inner box panel, and the inner box panel has a first sound insulation panel and a first sound absorption panel with different sound processing effects, the first sound insulation panel or the first sound absorption panel can be directed toward the test cavity by flipping the inner box panel, so that the switching of different test environments can be realized in one test box.

Description

Technical Field

[0001] The present disclosure relates to the technical field of acoustic performance testing, and in particular, to an acoustic performance testing device and a test box thereof. Background Art

[0002] The acoustic performance test device is a test device designed to detect the various acoustic properties of the material or equipment to be tested. In order to meet the requirements of different test environments, different test boxes need to be manufactured, such as reverberation boxes and anechoic boxes. In the related art, the box body of a single reverberation box or anechoic box can only achieve the reverberation or anechoic (semi-anechoic) effect alone. Therefore, the reverberation box and the anechoic box need to be used in combination to meet the test environment requirements of reverberation and anechoic (semi-anechoic). On the one hand, it will cause the entire test device to occupy a large space. On the other hand, when faced with different test environment requirements, the operator needs to switch the test piece between the reverberation box and the anechoic box. The switching speed is slow and the experimental efficiency is low. Summary of the invention

[0003] The purpose of the present disclosure is to provide an acoustic performance testing device and a testing box thereof to solve the technical problems existing in the related art.

[0004] To achieve the above-mentioned purpose, according to one aspect of the present disclosure, the present disclosure provides a test box of an acoustic performance testing device, comprising an outer box body and an inner box body arranged inside the outer box body, the inner box body comprising a plurality of inner box panels, the plurality of inner box panels together enclosing a test cavity, each of the inner box panels comprising a first sound insulation board and a first sound absorption board, the first sound insulation board and the first sound absorption board being arranged along the thickness direction of the inner box panels, the test box further comprising a flipping mechanism arranged in one-to-one correspondence with the plurality of inner box panels, each of the inner box panels being flippably connected to the outer box body through the corresponding flipping mechanism, so as to selectively enable the first sound insulation board or the first sound absorption board to face the test cavity.

[0005] Optionally, the flipping mechanism includes a connecting member, a slide groove corresponding to the connecting member is provided on the outer box body, one end of the inner box plate is rotatably connected to the first end of the connecting member, and the second end of the connecting member is movably connected to the slide groove.

[0006] Optionally, a surface of the first sound absorbing plate facing away from the first sound insulating plate has a plurality of protrusions protruding in a direction away from the first sound insulating plate.

[0007] Optionally, the protrusion is formed in a prism shape.

[0008] Optionally, each of the inner box panels further includes a protection plate, the protection plate is located on a side of the first sound absorbing plate away from the first sound insulating plate, and the protection plate has a plurality of through holes.

[0009] Optionally, a rib extending toward the protective plate is formed at an edge of the first sound insulation board, the first sound insulation board and the rib together define a receiving groove for receiving the first sound absorbing board, and the protective plate is connected to an end of the rib away from the first sound insulation board.

[0010] Optionally, the outer box body includes a box body and a carrying platform arranged in the box body, and the carrying platform is located at the bottom of the box body;

[0011] The plurality of inner box panels include a top panel and a bottom panel that are arranged opposite to each other, and a plurality of side panels that are located between the top panel and the bottom panel;

[0012] The multiple flipping mechanisms include a first flipping mechanism that is arranged one-to-one corresponding to the top plate and the multiple side plates, and a second flipping mechanism that corresponds to the bottom plate. The top plate and the side plates are both flippably connected to the inner wall of the box body through the corresponding first flipping mechanisms, and the bottom plate is supported on the supporting platform and flippably connected to the supporting platform through the corresponding second flipping mechanism.

[0013] Optionally, each of the inner box panels further comprises a protective plate, wherein the protective plate is located on a side of the first sound absorbing panel away from the first sound insulation panel, the protective plate of the top panel and the protective plate of the side panels among the plurality of inner box panels are both perforated panels, and the protective plate of the bottom panel among the plurality of inner box panels is a metal stranded wire mesh, and there is a gap between the metal stranded wire mesh and the first sound absorbing panel of the bottom panel.

[0014] Optionally, the opening rate of the perforated plate is 20%-40%.

[0015] Optionally, a first reinforcing beam is arranged on the first sound insulation board of the bottom plate, a second reinforcing beam crosses the first reinforcing beam and is plugged into the first reinforcing beam, and an end of the second reinforcing beam away from the first sound insulation board of the bottom plate supports the metal stranded wire mesh.

[0016] Optionally, the first flipping mechanism includes a first connecting member, a first rotating shaft and a first roller, a first sliding groove is arranged on the inner wall of the box body, one end of the top plate and one end of the side plate are provided with grooves, the groove has a notch and two open ends respectively located at both ends of the length direction of the notch, the first rotating shaft is rotatably arranged at the first end of the first connecting member, the first rotating shaft is located in the groove and is rotatably connected to the groove wall of the groove, the open end is used to avoid the first connecting member, the first roller is arranged at the second end of the first connecting member, and the first roller is movably arranged in the first sliding groove.

[0017] Optionally, the bearing platform is formed as a closed-loop frame structure, and a support bar is provided on the inner side wall of the closed-loop frame structure, and the support bar is used to support the bottom of the base plate;

[0018] The second flipping mechanism includes a second connecting member and a second roller. Second slide grooves are respectively formed on the two opposite inner side walls of the closed-loop frame structure. The second connecting member is a second rotating shaft. One end of the base plate is rotatably mounted on the second rotating shaft. The second roller is arranged at an end of the second rotating shaft away from the base plate, and the second roller is movably arranged in the second slide groove.

[0019] Optionally, a limiting protrusion is provided on the outer side wall of the carrying platform, and one end of the limiting protrusion away from the carrying platform abuts against the inner side wall of the box body to limit the horizontal movement of the carrying platform.

[0020] Optionally, the test box further comprises a speaker, and the speaker is disposed on the first sound insulation board of two inner box boards that are opposite to each other along the length direction or the width direction of the test box among the plurality of inner box boards; and / or,

[0021] The test box further comprises a sound reflector, and the sound reflector is disposed on the first sound insulation board of two inner box boards that are opposite to each other along the length direction or the width direction of the test box among the plurality of inner box boards.

[0022] Optionally, a first wire passing hole is formed on the outer box body, and a second wire passing hole and a third wire passing hole are formed on at least one inner box plate of the plurality of inner box plates. When the first sound insulation plate faces the test cavity, the first wire passing hole is coaxial with the second wire passing hole, and when the first sound absorbing plate faces the test cavity, the first wire passing hole is coaxial with the third wire passing hole.

[0023] Optionally, the outer box body includes a box body, the box body includes a plurality of outer box panels, the outer box panels include a second sound insulation panel, a second sound absorption panel and a third sound insulation panel, the second sound insulation panel, the second sound absorption panel and the third sound insulation panel are arranged along the thickness direction of the outer box panels, and the second sound absorption panel is located between the second sound insulation panel and the third sound insulation panel.

[0024] Optionally, the second sound absorbing plate includes a first sound absorbing layer, a second sound absorbing layer and an air layer, and the air layer is located between the first sound absorbing layer and the second sound absorbing layer.

[0025] According to another aspect of the present disclosure, the present disclosure provides an acoustic performance testing device, comprising the above-mentioned test box.

[0026] Optionally, the acoustic performance testing device also includes a sensor bracket and an acoustic sensor mounted on the sensor bracket, the sensor bracket and the acoustic sensor are used to be placed in the test cavity of the test box, the sensor bracket includes a bracket body, a first base and a second base, the bracket body can be selectively installed on the first base or the second base, the first base is a smooth metal base, and the surface of the second base is provided with sound-absorbing material.

[0027] Through the above technical solution, since an inner box body is arranged in the outer box body of the test box, and the inner box body is composed of a plurality of flippable inner box panels, and the inner box panels have board surfaces (i.e., a first sound insulation panel and a first sound absorption panel) with different sound processing effects, by flipping the inner box panels so that the first sound insulation panel or the first sound absorption panel faces the test chamber, the test chamber can have a reverberation test environment, an anechoic test environment, and a semi-anechoic test environment, thereby realizing the switching of different test environments through one test box. Compared with the solution in the related art that requires a plurality of different test boxes to realize different test environments, the test box provided by the present disclosure can realize the switching of different test environments, which, on the one hand, improves the versatility of the test box and reduces the overall volume and space occupied by the test box, and on the other hand, facilitates operators to realize different types of tests in the same test box, reduces the layout time required for switching different test environments, and improves the experimental efficiency.

[0028] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0030] Figure 1 is a partial longitudinal cross-sectional schematic diagram of a test box of an acoustic performance testing device provided in one embodiment of the present disclosure;

[0031] Figure 2 yes Figure 1 A magnified schematic diagram of part A;

[0032] Figure 3 is a schematic transverse cross-sectional view of a test box of an acoustic performance test device provided in one embodiment of the present disclosure;

[0033] Figure 4 is a side view schematic diagram of a first sound absorbing panel of a test box of an acoustic performance testing device provided in one embodiment of the present disclosure;

[0034] Figure 5It is a schematic diagram of the state of the inner box plate of the test box of the acoustic performance test device provided by one embodiment of the present disclosure before turning over;

[0035] Figure 6 Figure 5 A magnified schematic diagram of part B;

[0036] Figure 7 It is a schematic diagram of a first state when the inner box plate of a test box of an acoustic performance test device provided by an embodiment of the present disclosure is turned over;

[0037] Figure 8 It is a schematic diagram of a second state when the inner box plate of the test box of the acoustic performance test device provided by one embodiment of the present disclosure is turned over;

[0038] Fig. 9 It is a schematic diagram of a third state when the inner box plate of the test box of the acoustic performance test device provided by one embodiment of the present disclosure is turned over;

[0039] Fig.10 is a schematic diagram of a fourth state when the inner box plate of the test box of the acoustic performance test device provided by an embodiment of the present disclosure is turned over;

[0040] Fig.11 It is a schematic diagram of a state where the inner box plate of a test box of an acoustic performance test device provided by an embodiment of the present disclosure is turned over;

[0041] Fig.12 It is a three-dimensional schematic diagram of a first flipping mechanism of a test box of an acoustic performance testing device provided in one embodiment of the present disclosure;

[0042] Fig.13 It is an exploded schematic diagram of a support platform and a bottom plate of a test box of an acoustic performance test device provided in one embodiment of the present disclosure;

[0043] Fig.14 is a three-dimensional schematic diagram of a test box of an acoustic performance test device provided in one embodiment of the present disclosure;

[0044] Fig.15 is a perspective front view of an acoustic performance testing device provided by an embodiment of the present disclosure, wherein a sensor bracket is also shown;

[0045] Fig.16 is a three-dimensional schematic diagram of a hemispherical bracket of an acoustic performance testing device provided in one embodiment of the present disclosure;

[0046] Fig.17 It is a three-dimensional schematic diagram of a rectangular bracket of an acoustic performance testing device provided in one embodiment of the present disclosure.

[0047] Description of Reference Numerals

[0048] 10-acoustic performance test device; 101-sensor bracket; 1011-bracket body; 102-acoustic sensor; 100-test box; 1-outer box body; 11-slide; 111-first slide; 12-box body; 121-outer box board; 1211-second sound insulation board; 1212-second sound absorption board; 12121-first sound absorption layer; 12122-second sound absorption layer; 12123-air layer; 1213-third sound insulation board; 13-carrying platform; 131-support bar; 132-second slide; 133-limiting protrusion; 14-first wire hole; 15-box door; 151-castor; 2-inner box body; 21-inner box plate; 211-first sound insulation plate; 212-first sound absorption plate; 213-protrusion; 214-protective plate; 2141-perforated plate; 2142-metal stranded wire mesh; 215-edge retaining plate; 216-accommodating groove; 22-top plate; 23-bottom plate; 231-first reinforcing beam; 232-second reinforcing beam; 24-side plate; 25-groove; 3-test cavity; 4-turnover mechanism; 41-connecting piece; 42-first turnover mechanism; 421-first connecting piece; 422-first rotating shaft; 423-first roller; 43-second turnover mechanism; 431-second connecting piece; 432-second roller; 433-second rotating shaft; 5-speaker bracket. DETAILED DESCRIPTION

[0049] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0050] In the present disclosure, unless otherwise stated, the directional words used, such as "upper" and "lower", are generally defined based on the orientation of the test box of the acoustic performance test device in normal use. "Inside" and "outside" refer to the inside and outside of the contour of the corresponding component. In addition, the terms "first", "second", etc. are only used to distinguish descriptions and cannot be understood as indicating or implying relative importance.

[0051] like Figures 1 to 14 As shown, as one aspect of the present disclosure, the present disclosure provides a test box 100 of an acoustic performance test device, comprising an outer box body 1 and an inner box body 2 arranged inside the outer box body 1, the inner box body 2 comprises a plurality of inner box panels 21, the plurality of inner box panels 21 together enclose a test cavity 3, each inner box panel 21 comprises a first sound insulation panel 211 and a first sound absorption panel 212, the first sound insulation panel 211 and the first sound absorption panel 212 are arranged along the thickness direction of the inner box panel 21, the test box 100 further comprises a flipping mechanism 4 arranged one-to-one corresponding to the plurality of inner box panels 21, each inner box panel 21 is flipably connected to the outer box body 1 through the corresponding flipping mechanism 4, so as to selectively make the first sound insulation panel 211 or the first sound absorption panel 212 face the test cavity 3.

[0052] like Figure 5 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 and Fig.11 As shown, when different tests have different requirements for the test environment in the test box 100, for example, when a reverberation test environment is required, the inner box plate 21 can be flipped by the flipping mechanism 4 so that the first sound insulation plate 211 of the inner box plate 21 faces the test cavity 3, that is, the first sound insulation plates 211 of the multiple inner box plates 21 constitute the cavity wall of the test cavity 3, so that the first sound insulation plates 211 can have a certain reflection effect on the sound in the test cavity 3, and a reverberation test environment is formed in the test cavity 3; when an anechoic test environment is required, due to the good sound absorption effect of the first sound absorption plate 212, the inner box plate 21 can be flipped so that the first sound absorption plates 212 of the multiple inner box plates 21 face the test cavity 3, that is, the first sound absorption plates 212 of the multiple inner box plates 21 constitute the cavity wall of the test cavity 3, and an anechoic test environment is formed. In addition, the test box 100 can also achieve a semi-anechoic test environment, that is, part of the inner box panels 21 are flipped so that the first sound absorbing panels 212 of one part of the inner box panels 21 face the test cavity 3, and the first sound insulating panels 211 of another part of the inner box panels 21 face the test cavity 3, thereby forming a semi-anechoic test environment.

[0053] According to the above technical solution, since the inner box body 2 is arranged inside the outer box body 1 of the test box 100, and the inner box body 2 is composed of a plurality of flippable inner box panels 21, and the inner box panels 21 have board surfaces with different sound processing effects (i.e., the first sound insulation panel 211 and the first sound absorption panel 212), by flipping the inner box panels 21 so that the first sound insulation panel 211 or the first sound absorption panel 212 faces the test chamber 3, the test chamber 3 can have a reverberation test environment, an anechoic test environment, and a semi-anechoic test environment, thereby realizing the switching of different test environments through one test box 100. Compared with the solution in the related art that requires a plurality of different test boxes to realize different test environments, the test box 100 provided by the present disclosure can realize the switching of different test environments, which, on the one hand, improves the versatility of the test box 100, reduces the overall volume and occupied space of the test box 100, and on the other hand, facilitates the operator to realize different types of tests in the same test box 100, reduces the layout time required for switching different test environments, and improves the experimental efficiency.

[0054] Optionally, in order to make the first sound insulation board 211 have a good sound reflection effect, the first sound insulation board 211 can be made of a plate body of a high-density, high-hardness, low-sound-absorbing material. For example, the first sound insulation board 211 can be a steel plate, a bakelite plate, etc.

[0055] Optionally, in order to make the first sound absorbing plate 212 have a good sound absorbing effect, the first sound absorbing plate can be made of materials such as corrugated wool, glass fiber, etc.

[0056] The turning mechanism 4 can have any suitable structure, such as Figure 5 As shown, in one embodiment provided by the present disclosure, the flip mechanism 4 includes a connecting member 41, and a slide groove 11 corresponding to the connecting member 41 is provided on the outer box body 1. One end of the inner box plate 21 is rotatably connected to the first end of the connecting member 41, and the second end of the connecting member 41 is movably connected to the slide groove 11. When the inner box plate 21 flips, as shown in FIG. Figure 5 , Figure 7 and Figure 8 As shown, the inner box plate 21 can be rotated around the first end of the connecting member 41 to be perpendicular to the slide groove 11, and then the inner box plate 21 and the connecting member 41 can be slid from one end of the slide groove 11 to the other end of the slide groove 11 (as shown in FIG. Fig. 9 Then, the inner box plate 21 is rotated around the first end of the connecting member 41 until it is parallel to the slide groove 11 (as shown in FIG. Fig. 9 and Fig.10 As shown), the inner box plate 21 is turned 180°.

[0057] Optionally, the second end of the connecting member 41 may be movably connected to the slide groove 11 via a roller, a slider, etc.

[0058] In another embodiment provided in the present disclosure, the flipping mechanism 4 may include a rotating shaft, and the inner box plate 21 is connected to the outer box body 1 through the rotating shaft. The inner box plate 21 can be flipped 180° through the rotating shaft so that the first sound insulation plate 211 or the first sound absorption plate 212 faces the test cavity 3.

[0059] In another embodiment provided by the present disclosure, each inner box board 21 includes a plurality of inner box board unit boards, each inner box board unit board is provided with a rotating shaft so that the inner box board unit board can rotate around the rotating shaft. This arrangement can reduce the space required for the inner box board 21 to flip, and can also realize the flipping of the inner box board 21.

[0060] In order to improve the sound absorption effect of the first sound absorption plate 212, optionally, as Figure 4As shown, the first sound absorbing plate 212 has a plurality of protrusions 213 protruding in a direction away from the first sound insulating plate 211 on one side thereof away from the first sound insulating plate 211. The plurality of protrusions 213 are formed on the side thereof away from the first sound insulating plate 211, that is, when the test box 100 is in an anechoic or semi-anechoic test environment (that is, when the first sound absorbing plate 212 faces the test chamber 3), the first sound absorbing plate 212 has a plurality of protrusions 213 facing the inside of the test chamber 3 on one side thereof facing the test chamber 3. In this way, the surface area of ​​the first sound absorbing plate 212 facing the test chamber 3 is increased, the sound absorption effect is improved, and low-frequency sound waves can be repeatedly reflected and consumed between the plurality of protrusions 213, which can further improve the sound absorption effect of the first sound absorbing plate 212. In addition, under the same sound absorption conditions, the first sound absorbing plate 212 provided with the protrusions 213 can be thinner, which reduces the space occupied by the inner box plate 21, making the flipping process more convenient.

[0061] Optionally, the plurality of protrusions 213 may be arranged in an array (e.g., a rectangular array, a circular array, etc.). The protrusions 213 arranged in an array may maximize the use of the surface area of ​​the first sound absorbing plate 212, and more protrusions 213 may be arranged to maximize the surface area of ​​the first sound absorbing plate 212 facing away from the first sound insulation plate 211.

[0062] Alternatively, if Figure 4 As shown, the protrusion 213 can be formed into a prism shape. The prism-shaped protrusion 213 includes not only an inclined surface, but each prism also includes a top surface, so that the surface area of ​​the protrusion 213 can be increased. In addition, the inclined surfaces of two adjacent prisms are not parallel, and the sound waves will not be reflected back and forth between the two prisms to form resonance, thereby increasing the sound absorption effect of the first sound absorbing plate 212.

[0063] Here, the shape of the protrusion 213 can also be hemispherical, pyramidal, etc., as long as the surface area of ​​the first sound absorbing plate 212 can be increased, and the present disclosure does not limit this.

[0064] In order to protect the first sound absorbing plate 212, optionally, as Figure 1 As shown, each inner box panel 21 further includes a protection plate 214, which is located on the side of the first sound absorbing plate 212 away from the first sound insulating plate 211, and has a plurality of through holes. Due to the structural characteristics of the sound absorbing material, in order to prevent the operator from damaging the surface of the first sound absorbing plate 212 during operation, a protection plate 214 is provided on the side of the first sound absorbing plate 212 away from the first sound insulating plate 211, and the protection plate 214 can protect the first sound absorbing plate 212, and has a plurality of through holes, so that sound waves can pass through the through holes and reach the first sound absorbing plate 212, so as to be absorbed by the first sound absorbing plate 212, thereby creating a sound-absorbing or semi-sound-absorbing environment.

[0065] Optionally, in order to facilitate the installation of the protection plate 214, as Figure 1 and Fig.13 As shown, a retaining edge 215 extending toward the protective plate 214 is formed at the edge of the first sound insulation board 211, and the first sound insulation board 211 and the retaining edge 215 together define a receiving groove 216 for receiving the first sound absorbing board 212, and the protective plate 214 is connected to an end of the retaining edge 215 away from the first sound insulation board 211. In order to combine and install the first sound insulation board 211 and the first sound absorbing board 212 to form the inner box board 21, a retaining edge 215 extending toward the protective plate 214 is formed at the edge of the first sound insulation board 211 to form a receiving groove 216 to receive the first sound absorbing board 212. The retaining edge 215 can not only play the role of connecting the first sound insulation board 211 and the first sound absorbing board 212, but also can surround the first sound absorbing board 212 by surrounding the first sound absorbing board 212, so as to surround the first sound absorbing board 212 together with the protective plate 214, so as to ensure that the first sound absorbing board 212 is not damaged.

[0066] Here, the retaining edge 215 and the first sound insulation board 211 can be integrally formed as needed, or they can be made separately and then connected to each other, which is not limited in the present disclosure. In addition, the retaining edge 215 and the first sound insulation board 211 can be made of the same material (that is, the retaining edge 215 can also have a sound insulation effect), or they can be made of different materials. This is not limited in the present disclosure.

[0067] Alternatively, if Figure 1 , Figure 2 and Fig.13 As shown, the outer box body 1 includes a box body 12 and a bearing platform 13 arranged in the box body 12, and the bearing platform 13 is located at the bottom of the box body 12. The multiple inner box panels 21 include a top plate 22 and a bottom plate 23 arranged opposite to each other, and a plurality of side plates 24 located between the top plate 22 and the bottom plate 23. The multiple flipping mechanisms 4 include a first flipping mechanism 42 arranged in a one-to-one correspondence with the top plate 22 and the multiple side plates 24, and a second flipping mechanism 43 corresponding to the bottom plate 23. The top plate 22 and the side plate 24 are both flipably connected to the inner wall of the box body 12 through the corresponding first flipping mechanism 42, and the bottom plate 23 is supported on the bearing platform 13 and flipably connected to the bearing platform 13 through the corresponding second flipping mechanism 43.

[0068] The bearing platform 13 is arranged at the bottom of the box body 12, and the bottom plate 23 is reversibly connected to the bearing platform 13. Considering that the bottom plate 23 needs to place the device to be tested or the test piece during the test process and has a load-bearing function, a special bearing platform 13 is arranged to bear the bottom plate 23 to improve the load-bearing capacity of the bottom plate 23.

[0069] It is understandable that the box body 12 has a box door 15 , on which one of the side panels 24 is mounted, the side panel 24 is connected to the box door 15 via a first flip mechanism 42 , and the side panel 24 can move together with the opening and closing of the box door 15 .

[0070] When the test environment needs to be changed, the box door 15 can be opened first, and then the bottom plate 23 disposed in the support platform 13 can be turned over by the second turning mechanism 43, and then the top plate 22 and the plurality of side plates 24 can be turned over by the first turning mechanism 42. The above turning sequence is only an example embodiment, and the present disclosure does not limit the turning sequence. Fig.14 As shown, casters 151 may be provided at the bottom of the door 15 to support the door body of the door 15 when the door 15 moves. In addition, sealing strips may be provided around the door 15 to improve the sound insulation effect.

[0071] Optionally, there may be air gaps between the bottom plate 23, the top plate 22 and the side plates 24 and the inner wall of the box body 12. The air gaps can provide a space for the top plate 22 and the side plates 24 to flip over, and can also play a role in sound insulation and sound absorption between the inner box plate 21 and the box body 12.

[0072] Alternatively, if Figure 1 As shown, each inner box panel 21 further includes a protection plate 214, which is located on the side of the first sound absorbing plate 212 away from the first sound insulation plate 211, the protection plate 214 of the top plate 22 and the protection plate 214 of the side plates 24 in the multiple inner box panels 21 are both perforated plates 2141, and the protection plate 214 of the bottom plate 23 in the multiple inner box panels 21 is a metal stranded wire mesh 2142, and there is a gap between the metal stranded wire mesh 2142 and the first sound absorbing plate 212 of the bottom plate 23.

[0073] In order to protect the sound absorption structure of the first sound absorption plate 212 from being damaged, a protective plate 214 is provided on the side of the first sound absorption plate 212 away from the first sound insulation plate 211. The protective plates 214 of the top plate 22 and the side plate 24 are both perforated plates 2141, that is, sound waves can reach the first sound absorption plate 212 through the perforations on the perforated plates 2141. At the same time, the other parts of the perforated plate 2141 except the perforations can also be used as the protective plate 214 to prevent the structure of the first sound absorption plate 212 from being damaged. The protective plate 214 of the bottom plate 23 is set as a metal stranded wire mesh 2142 because the bottom plate 23 is used as a load-bearing plate, and the use of the metal stranded wire mesh 2142 can improve the load-bearing performance of the bottom plate 23. At the same time, in order to prevent the metal stranded wire mesh 2142 from deforming during use and thus touching the first sound absorbing plate 212 below, a gap is provided between the metal stranded wire mesh 2142 and the first sound absorbing plate 212, thereby providing space for the load-bearing and deformation of the metal stranded wire mesh 2142 and protecting the first sound absorbing plate 212.

[0074] Optionally, the opening rate of the perforated plate 2141 is 20%-40%. The opening rate refers to the ratio of the sum of the areas of the openings to the total area of ​​the perforated plate 2141. Since the perforated plate 2141 has an opening part and an unopened part, in order to prevent the unopened part from reflecting sound waves and reduce the sound absorption effect of the first sound absorbing plate 212 in the anechoic test environment, the opening rate is maintained at 20%-40%, which can allow as many sound waves as possible to pass through the perforations, while also reducing sound wave reflections and reducing the impact of the perforated plate 2141 on the test environment. Moreover, under the premise of reducing the impact, the strength of the perforated plate 2141 can also be guaranteed to protect the first sound absorbing plate 212.

[0075] In order to improve the strength of the bottom plate 23 and the bearing capacity of the metal stranded wire mesh 2142, optionally, as Fig.13 As shown, a first reinforcing beam 231 is arranged on the first sound insulation board 211 of the bottom plate 23, a second reinforcing beam 232 crosses the first reinforcing beam 231 and is plugged into the first reinforcing beam 231, and an end of the second reinforcing beam 232 away from the first sound insulation board 211 of the bottom plate 23 supports the metal stranded wire mesh 2142. The crossed first reinforcing beam 231 and the second reinforcing beam 232, on the one hand, strengthen the bending resistance of the first sound insulation board 211 of the bottom plate 23, so that the bottom plate 23 can bear a greater weight; on the other hand, the second reinforcing beam 232 can also provide multi-point support for the metal stranded wire mesh 2142, thereby increasing the bearing capacity of the metal stranded wire mesh 2142.

[0076] Optionally, there may be a plurality of the first reinforcing beam 231 and the second reinforcing beam 232 , and the plurality of first reinforcing beams 231 and the plurality of second reinforcing beams 232 are arranged in an interlaced manner.

[0077] Alternatively, if Fig.13 As shown, a rib 215 of the bottom plate 23 extending toward the metal stranded wire mesh 2142 is formed at the edge of the first sound insulation board 211 of the bottom plate 23, and the first sound insulation board 211 of the bottom plate 23 and the rib 215 of the bottom plate 23 jointly define a receiving groove 216 for receiving the first sound absorbing board 212 of the bottom plate 23, and the metal stranded wire mesh 2142 is connected to one end of the rib 215 of the bottom plate 23 away from the first sound insulation board 211 of the bottom plate 23, and the first sound absorbing board 212 of the bottom plate 23 is arranged in the receiving groove 216 of the bottom plate 23. The first reinforcing beam 231 and the second reinforcing beam 232 are arranged in the receiving groove 216 of the bottom plate 23, and the two ends of the first reinforcing beam 231 are respectively connected to the rib 215 of the bottom plate 23, and the two ends of the second reinforcing beam 232 are respectively connected to the rib 215 of the bottom plate 23. With such arrangement, the first reinforcing beam 231 , the second reinforcing beam 232 and the retaining edge 215 of the bottom plate 23 cooperate to increase the strength of the bottom plate 23 .

[0078] Alternatively, if Figure 6 and Fig.12 As shown, the first flip mechanism 42 may include a first connecting member 421, a first rotating shaft 422 and a first roller 423. A first slide groove 111 is provided on the inner wall of the box body 12. A groove 25 is provided at one end of the top plate 22 and one end of the side plate 24. The groove 25 has a notch and two open ends respectively located at both ends in the length direction of the notch. The first rotating shaft 422 is rotatably provided at the first end of the first connecting member 421. The first rotating shaft 422 is located in the groove 25 and is rotatably connected to the groove wall of the groove 25. The open end is used to avoid the first connecting member 421. The first roller 423 is provided at the second end of the first connecting member 421, and the first roller 423 is movably provided in the first slide groove 111. Since a 180° flip needs to be completed during the flipping process of the top plate 22 and the side plate 24, in order to avoid the first connecting member 421, the groove 25 has a notch and two open ends respectively located at both ends in the length direction of the notch. In this arrangement, when the top plate 22 and the side plate 24 are facing the test cavity 3 , the first connecting member 421 connected to the inner wall of the box body 12 can maintain a vertical arrangement with the top plate 22 or the side plate 24 , regardless of whether the first sound insulation plate 211 or the first sound absorption plate 212 is facing the test cavity 3 .

[0079] Alternatively, if Figure 1 and Fig.13 As shown, the bearing platform 13 is formed into a closed-loop frame structure, and a support bar 131 is provided on the inner side wall of the closed-loop frame structure, and the support bar 131 is used to support the bottom of the bottom plate 23. The second flip mechanism 43 includes a second connecting member 431 and a second roller 432, and second slide grooves 132 are formed on the two opposite inner side walls of the closed-loop frame structure respectively, and the second connecting member 431 is a second rotating shaft 433, and one end of the bottom plate 23 is rotatably sleeved on the second rotating shaft 433, and the second roller 432 is provided at one end of the second rotating shaft 433 away from the bottom plate 23, and the second roller 432 is movably provided in the second slide groove 132. The bearing platform 13 is set as a closed-loop frame structure. On the one hand, the bottom plate 23 can be installed in the closed-loop frame structure, and the support bar 131 is provided on the inner side wall of the closed-loop frame structure to support the bottom plate 23 in the bearing platform 13. On the other hand, one end of the plurality of side plates 24 can also be placed on the frame of the closed-loop frame structure to provide support for the plurality of side plates 24.

[0080] The second rotating shaft 433 is passed through one end of the bottom plate 23, and second rollers 432 are respectively provided at both ends of the second rotating shaft 433. When the bottom plate 23 is flipped, the end of the bottom plate 23 away from the rotating shaft is first lifted up, and then the bottom plate 23 is driven by the roller to slide to the other end in the second slide groove 132, and then the bottom plate 23 is flipped and put down to complete the flipping.

[0081] Optionally, there may be two second rotating shafts 433, which are respectively arranged on both sides of one end of the bottom plate 23, and the other end of the second rotating shaft 433 is provided with a second roller 432, which is movably arranged in the second slide groove 132. Such an arrangement can reduce the processing difficulty of connecting the second rotating shaft 433 and the bottom plate 23 and improve the processing efficiency.

[0082] In order to limit the range of motion of the carrier platform 13, optionally, as Figure 1 and Fig.13 As shown, a limiting protrusion 133 is provided on the outer wall of the carrying platform 13 , and one end of the limiting protrusion 133 away from the carrying platform 13 abuts against the inner wall of the box body 12 to limit the horizontal movement of the carrying platform 13 .

[0083] Optionally, there are multiple limiting protrusions 133, and the multiple limiting protrusions are arranged around the supporting platform 13, so that no matter in which direction the supporting platform 13 moves on the horizontal plane, there is a corresponding limiting protrusion 133 against the inner wall of the box body 12, so that the supporting platform 13 will not move in the horizontal direction, thereby improving the load-bearing stability of the supporting platform 13.

[0084] Optionally, the test box 100 further includes a speaker, and a speaker is disposed on the first sound insulation board 211 of two inner box boards 21 that are opposite to each other along the length direction or the width direction of the test box 100 among the plurality of inner box boards 21 .

[0085] Optionally, the test box 100 further includes a sound reflector, and the sound reflector is disposed on the first sound insulation panels 211 of two inner box panels 21 that are opposite to each other along the length direction or the width direction of the test box 100 among the plurality of inner box panels 21 .

[0086] In the reverberation test environment, it is necessary to add a loudspeaker as a sound source and add a sound reflector to enhance the environmental reverberation effect. The first sound insulation board 211 is facing the test chamber 3 at this time, so the loudspeaker and the sound reflector are set on the first sound insulation board 211. In the reverberation test environment, the loudspeaker can be set in the test chamber 3. In addition, in order to ensure the reverberation effect of the reverberation environment, the loudspeaker can be set on the first sound insulation board 211 of the two inner box boards 21 opposite to each other along the length direction of the test box 100, and the sound reflector can be set on the first sound insulation board 211 of the two inner box boards 21 opposite to each other along the width direction of the test box 100 according to the situation; or, the loudspeaker and the sound reflector are set on the same inner box board 21, which is not limited in the present disclosure.

[0087] Alternatively, if Figure 1As shown, the test box 100 further includes a speaker bracket 5, which is disposed on the first sound insulation board 211 of two inner box boards 21 opposite to each other along the length direction or the width direction of the test box 100, and the speaker is detachably disposed on the speaker bracket 5. In an anechoic or semi-anechoic test environment, the speaker bracket 5 can be flipped to the side away from the test cavity 3 by flipping the inner box board 21, and the test in the anechoic or semi-anechoic test environment will not be affected.

[0088] To facilitate the passage of the wiring harness, optionally, Fig.14 As shown, a first wire hole 14 is formed on the outer box body 1, and a second wire hole and a third wire hole are formed on at least one of the multiple inner box boards 21. When the first sound insulation board 211 faces the test chamber 3, the first wire hole 14 is coaxial with the second wire hole, and when the first sound absorption board 212 faces the test chamber 3, the first wire hole 14 is coaxial with the third wire hole. In the reverberation test environment, a speaker and an acoustic sensor 102 are arranged in the test chamber 3. In the anechoic or semi-anechoic test environment, an acoustic sensor 102 is also arranged in the test chamber 3. Both the speaker and the acoustic sensor 102 need to be electrically connected to the test equipment outside the test box 100 through a wiring harness. Therefore, the first wire hole 14, the second wire hole and the third wire hole are respectively set. Since the inner box board 21 needs to be flipped in the outer box body 1, and each flip, the position of the inner box board 21 corresponding to the first wire hole 14 will also change. Therefore, for different test environments, the second wire hole and the third wire hole are respectively set coaxially with the first wire hole 14, so that the wire harness can pass through the inner box plate 21 and the outer box plate 121 and pass out of the test box 100 in different test environments.

[0089] Alternatively, if Figure 1 As shown, the outer box body 1 includes a box body 12, the box body 12 includes a plurality of outer box panels 121, the outer box panels 121 include a second sound insulation panel 1211, a second sound absorption panel 1212 and a third sound insulation panel 1213, the second sound insulation panel 1211, the second sound absorption panel 1212 and the third sound insulation panel 1213 are arranged along the thickness direction of the outer box panel 121, and the second sound absorption panel 1212 is located between the second sound insulation panel 1211 and the third sound insulation panel 1213. In order to reduce the influence of the surrounding environmental noise on the test results, the outer box panel 121 is composed of the second sound insulation panel 1211, the second sound absorption panel 1212 and the third sound insulation panel 1213.

[0090] Taking the case where the second sound insulation board 1211 is arranged on the side of the outer box board 121 facing away from the inner box body 2 as an example, after the external noise passes through the second sound insulation board 1211, part of the noise is reflected back to the outside, and the remaining part of the noise is absorbed by the second sound absorbing board 1212, and the rest reaches the third sound insulation board 1213. After the isolation and reflection of the third sound insulation board 1213, the noise influence is almost shielded outside the main box body, thereby optimizing the test environment of the inner box body 2.

[0091] Alternatively, if Figure 1 As shown, the second sound absorbing board 1212 includes a first sound absorbing layer 12121, a second sound absorbing layer 12122 and an air layer 12123, and the air layer 12123 is located between the first sound absorbing layer 12121 and the second sound absorbing layer 12122. Since the second sound insulation board 1211 and the third sound insulation board 1213 are directly connected through the second sound absorbing board 1212, a sound bridge will be formed, which reduces the sound insulation and sound absorption effect. The second sound absorbing board 1212 is divided into the first sound absorbing layer 12121, the second sound absorbing layer 12122 and the air layer 12123, and the air layer 12123 is arranged between the first sound absorbing layer 12121 and the second sound absorbing layer 12122, so that the air layer 12123 can block the sound bridge and improve the sound insulation and sound absorption effect of the outer box board 121.

[0092] As another aspect provided by the present disclosure, Fig.15 As shown, the present disclosure further provides an acoustic performance testing device 10 , comprising the above-mentioned test box 100 .

[0093] Alternatively, if Fig.15 As shown, the acoustic performance test device 10 also includes a sensor bracket 101 and an acoustic sensor 102 mounted on the sensor bracket 101. The sensor bracket 101 and the acoustic sensor 102 are used to be placed in the test chamber 3 of the test box 100. The sensor bracket 101 includes a bracket body 1011, a first base and a second base. The bracket body 1011 can be selectively installed on the first base or the second base. The first base is a smooth metal base, and the surface of the second base is provided with a sound-absorbing material. For different test environments, the sensor bracket 101 can select different bases. For example, in the anechoic and semi-anechoic test environment, the second base can be selected, and in the reverberation test environment, the first base can be selected. With such arrangement, on the one hand, the first base and the second base can fix the bracket body 1011 in the test cavity 3, thereby ensuring the stability of the bracket body 1011 during the test and reducing interference with the test results; on the other hand, the first base is a smooth metal base, which can reflect sound waves in a reverberation environment and enhance the reverberation effect; the surface of the second base is provided with sound-absorbing material, which can absorb sound waves and enhance the silencing effect in an anechoic and semi-anechoic test environment.

[0094] Optionally, the bracket body 1011 includes telescopic support rods, and the acoustic sensor 102 is disposed on the support rods. A plurality of support rods are interconnected to form bracket bodies 1011 with different structures, including cross brackets, hemispherical brackets, and rectangular brackets. The bracket body 1011 can adjust the specifications of the bracket body 1011 by adjusting the lengths of the support rods according to the installation position and size of the workpiece or device to be measured, so as to meet the requirements of the test.

[0095] Among them, as Fig.15 shown, the cross bracket is composed of a vertical support rod and a horizontal cross bracket. The vertical support rod is threadedly connected to the first base or the second base, and the horizontal cross bracket is fixed on the vertical support rod. The acoustic sensor 102 is fixed on the horizontal cross bracket, and by adjusting the length of the vertical support rod, the height of the acoustic sensor 102 disposed on the cross bracket can be adjusted. The cross bracket is mainly used for tests in reverberation environments, such as reverberation sound absorption coefficient tests of acoustic materials, reverberation transmission loss tests, etc.

[0096] As Fig.16 shown, the hemispherical bracket is composed of meridional and latitudinal support rods. There are a total of four meridional support rods, which are elastic straight rods, bendable, and can be stretched at one end. One end is connected to the base, and the other ends meet at the top to form a "cross" shape; there are a total of three layers of latitudinal support rods, 6 semi-circular rings, in a semi-circular shape, with three bending radii corresponding to different heights of the spherical surface, and can be stretched at both ends and interconnected with the latitudinal support rods, so that the meridional and latitudinal rods together present a spherical structure; the top cross can be stretched horizontally and vertically and move on the meridional support rod to ensure that the middle of the cross corresponds to the top of the sphere. The acoustic sensor 102 is fixed on the latitudinal support rod and can be horizontally slid to adjust the position.

[0097] As Fig.17 shown, the rectangular bracket is composed of multiple support rods. There are four vertical support rods on the four sides connected to the base for fixing the position of the frame; the horizontal structure includes six support rods, and the support rods are in a "field" shape and interconnected with the vertical support rods. The acoustic sensor 102 is fixed on the horizontal structure, and by vertically translating the horizontal structure as a whole, the height of the acoustic sensor 102 can be adjusted, and the horizontal position can be adjusted by sliding the acoustic sensor 102.

[0098] The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0099] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0100] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A test box for an acoustic performance test device, characterized in that: The test box (100) comprises an outer box body (1) and an inner box body (2) arranged inside the outer box body (1), the inner box body (2) comprising a plurality of inner box panels (21), the plurality of inner box panels (21) collectively enclosing a test cavity (3), each of the inner box panels (21) comprising a first sound insulation panel (211) and a first sound absorption panel (212), the first sound insulation panel (211) and the first sound absorption panel (212) being arranged along the thickness direction of the inner box panel (21), the test box (100) further comprising a turnover mechanism (4) arranged in one-to-one correspondence with the plurality of inner box panels (21), each of the inner box panels (21) being flipably connected to the outer box body (1) via the corresponding turnover mechanism (4), so as to selectively enable the first sound insulation panel (211) or the first sound absorption panel (212) to face the test cavity (3).

2. The test box according to claim 1, characterized in that: The flip mechanism (4) comprises a connecting member (41), a slide groove (11) corresponding to the connecting member (41) is provided on the outer box body (1), one end of the inner box plate (21) is rotatably connected to the first end of the connecting member (41), and the second end of the connecting member (41) is movably connected to the slide groove (11).

3. The test box according to claim 1, characterized in that: A surface of the first sound absorbing plate (212) facing away from the first sound insulating plate (211) has a plurality of protrusions (213) protruding in a direction away from the first sound insulating plate (211).

4. The test box according to claim 3, characterized in that: The protrusion (213) is formed in a prism shape.

5. The test box according to claim 1, characterized in that: Each of the inner box panels (21) further comprises a protection plate (214), the protection plate (214) being located on a side of the first sound absorbing plate (212) away from the first sound insulating plate (211), and having a plurality of through holes.

6. The test box according to claim 5, characterized in that: A retaining edge (215) extending toward the protective plate (214) is formed at an edge of the first sound insulation plate (211); the first sound insulation plate (211) and the retaining edge (215) together define a receiving groove (216) for receiving the first sound absorption plate (212); and the protective plate (214) is connected to an end of the retaining edge (215) away from the first sound insulation plate (211).

7. The test box according to claim 1, characterized in that: The outer box body (1) comprises a box body (12) and a bearing platform (13) arranged inside the box body (12), wherein the bearing platform (13) is located at the bottom of the box body (12); The plurality of inner box panels (21) include a top panel (22) and a bottom panel (23) that are arranged opposite to each other, and a plurality of side panels (24) located between the top panel (22) and the bottom panel (23); The plurality of flipping mechanisms (4) include first flipping mechanisms (42) arranged one-to-one corresponding to the top plate (22) and the plurality of side plates (24) and second flipping mechanisms (43) corresponding to the bottom plate (23); the top plate (22) and the side plates (24) are both flippably connected to the inner wall of the box body (12) via the corresponding first flipping mechanisms (42); the bottom plate (23) is supported on the supporting platform (13) and is flippably connected to the supporting platform (13) via the corresponding second flipping mechanisms (43).

8. The test box according to claim 7, characterized in that: Each of the inner box panels (21) further comprises a protection plate (214), the protection plate (214) being located on a side of the first sound absorbing plate (212) away from the first sound insulating plate (211), the protection plates (214) of the top plate (22) and the protection plates (214) of the side plates (24) in the plurality of the inner box panels (21) being perforated plates (2141), and the protection plates (214) of the bottom plate (23) in the plurality of the inner box panels (21) being a metal stranded wire mesh (2142), and a gap being provided between the metal stranded wire mesh (2142) and the first sound absorbing plate (212) of the bottom plate (23).

9. The test box according to claim 8, characterized in that: The perforation rate of the perforated plate (2141) is 20%-40%.

10. The test box according to claim 8, characterized in that: A first reinforcing beam (231) is arranged on the first sound insulation board (211) of the bottom plate (23); the bottom plate (23) further comprises a second reinforcing beam (232) intersecting the first reinforcing beam (231); the second reinforcing beam (232) is plugged into the first reinforcing beam (231); an end of the second reinforcing beam (232) away from the first sound insulation board (211) of the bottom plate (23) supports the metal stranded wire mesh (2142).

11. The test box according to claim 7, characterized in that: The first flip mechanism (42) comprises a first connecting member (421), a first rotating shaft (422) and a first roller (423); a first sliding groove (111) is arranged on the inner wall of the box body (12); one end of the top plate (22) and one end of the side plate (24) are both provided with a groove (25); the groove (25) comprises a notch and two open ends respectively located at two ends of the length direction of the notch; the first rotating shaft (422) is rotatably arranged at the first end of the first connecting member (421); the first rotating shaft (422) is located in the groove (25) and is rotatably connected to the groove wall of the groove (25); the open end is used to avoid the first connecting member (421); the first roller (423) is arranged at the second end of the first connecting member (421), and the first roller (423) is movably arranged in the first sliding groove (111).

12. The test box according to claim 7, characterized in that: The bearing platform (13) is formed into a closed-loop frame structure, and a support bar (131) is provided on the inner side wall of the closed-loop frame structure, and the support bar (131) is used to support the bottom of the bottom plate (23); The second flipping mechanism (43) comprises a second connecting member (431) and a second roller (432); second slide grooves (132) are respectively formed on two opposite inner side walls of the closed-loop frame structure; the second connecting member (431) is a second rotating shaft (433); one end of the base plate (23) is rotatably mounted on the second rotating shaft (433); the second roller (432) is arranged at one end of the second rotating shaft (433) away from the base plate (23); and the second roller (432) is movably arranged in the second slide groove (132).

13. The test box according to claim 7, characterized in that: A limiting protrusion (133) is provided on the outer side wall of the bearing platform (13), and one end of the limiting protrusion (133) away from the bearing platform (13) abuts against the inner side wall of the box body (12) to limit the horizontal movement of the bearing platform (13).

14. The test box according to any one of claims 1 to 13, characterized in that: The test box (100) further comprises a speaker, wherein the speaker is arranged on the first sound insulation board (211) of two inner box boards (21) that are opposite to each other along the length direction or the width direction of the test box (100); and / or, The test box (100) further comprises a sound reflector, and the sound reflector is provided on the first sound insulation board (211) of two inner box boards (21) that are opposite to each other along the length direction or the width direction of the test box (100) among the plurality of inner box boards (21).

15. The test box according to any one of claims 1 to 13, characterized in that: The outer box body (1) is formed with a first wire passing hole (14), and at least one of the plurality of inner box plates (21) is formed with a second wire passing hole and a third wire passing hole opposite to each other, and when the first sound insulation plate (211) faces the inside of the test cavity (3), the first wire passing hole (14) is coaxial with the second wire passing hole, and when the first sound absorption plate (212) faces the inside of the test cavity (3), the first wire passing hole (14) is coaxial with the third wire passing hole.

16. The test box according to any one of claims 1 to 13, characterized in that: The outer box body (1) comprises a box body (12), the box body (12) comprises a plurality of outer box panels (121), the outer box panels (121) comprise a second sound insulation panel (1211), a second sound absorption panel (1212) and a third sound insulation panel (1213), the second sound insulation panel (1211), the second sound absorption panel (1212) and the third sound insulation panel (1213) are arranged along the thickness direction of the outer box panel (121), and the second sound absorption panel (1212) is located between the second sound insulation panel (1211) and the third sound insulation panel (1213).

17. The test box according to claim 16, characterized in that: The second sound absorbing plate (1212) comprises a first sound absorbing layer (12121), a second sound absorbing layer (12122), and an air layer (12123), wherein the air layer (12123) is located between the first sound absorbing layer (12121) and the second sound absorbing layer (12122).

18. An acoustic performance testing device, characterized in that: A test box (100) comprising any one of claims 1 to 17.

19. The acoustic performance testing device according to claim 18, characterized in that: The acoustic performance testing device (10) further comprises a sensor bracket (101) and an acoustic sensor (102) mounted on the sensor bracket (101); the sensor bracket (101) and the acoustic sensor (102) are used to be placed in a test cavity (3) of the test box (100); the sensor bracket (101) comprises a bracket body (1011), a first base and a second base; the bracket body (1011) can be selectively mounted on the first base or the second base; the first base is a smooth metal base; and a sound absorbing material is provided on the surface of the second base.

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