A sound insulation test chamber and sound insulation test equipment

Abstract

This invention discloses a sound insulation testing chamber and a sound insulation testing device. The sound insulation testing chamber includes an inner shell, an outer shell, a testing platform, and a damping layer. The outer shell is used for low-frequency sound insulation and is equipped with a first cavity. The inner shell is used for high-frequency sound insulation and is equipped with a second cavity, which is mounted on the cavity wall of the first cavity via a first support column. The testing platform is disposed in the second cavity and is mounted on the cavity wall of the first cavity via a second support column. The damping layer is disposed in the first cavity and located outside the inner shell. The inner shell is mounted on the cavity wall of the first cavity via the first support column, and the testing platform is mounted on the cavity wall of the first cavity via the second support column. This allows the low-frequency vibrations generated by the workpiece to be directly transmitted to the outer shell, bypassing the inner shell and the damping layer. This reduces the direct impact on the damping material and sound absorption structure, and eliminates the need for an additional low-frequency noise reduction structure on the inner shell. Within a limited space, this invention solves the problems of insufficient sound insulation across low, medium, and high frequency bands and inadequate long-term stability in existing technologies.

Description

Technical Field

[0001] This disclosure relates to the field of sound insulation testing structure technology, and more specifically, to a sound insulation testing chamber and sound insulation testing equipment. Background Technology

[0002] In modern industrial testing and scientific research experiments, sound insulation testing devices are widely used for evaluating the acoustic performance of mechanical equipment, electronic devices, and materials. Their core objective is to ensure the enclosure of the testing environment, reducing the impact of external noise while preventing noise leakage from the internal testing environment, thus obtaining accurate acoustic data. Typically, such devices consist of a housing and a test platform. The housing provides sound insulation and structural protection, while the test platform is used to fix and position the workpiece under test. In traditional designs, technicians usually choose metal sheets, such as steel or aluminum alloy plates, as the housing to effectively block the propagation of low-frequency sound waves. These materials can significantly suppress low-frequency vibrations and reduce the interference of external noise on the internal testing environment. However, the aforementioned metal plates still have limitations in the mid-to-high frequency range. Especially when the plate size and boundary conditions approach certain critical frequencies, resonance or a "coincidence effect" can occur, affecting the accuracy of mid-to-high frequency measurements.

[0003] To compensate for the insufficient sound insulation of conventional metal plates in the mid-to-high frequency range, existing technologies often incorporate sound-absorbing and damping materials inside the outer shell. For example, multi-layered composite materials such as polyurethane foam, glass wool, mineral wool, or polymer damping adhesives are used to reduce the transmission of mid-to-high frequency noise. However, in practical applications, it has been found that the test bench generates low-frequency vibrations. These low-frequency vibrations act on the sound-absorbing and damping materials, meaning they are transmitted through the support path to the internal damping and sound-absorbing materials. This reduces the vibration dissipation efficiency of the sound-absorbing and damping materials and creates a low-frequency acoustic leakage path in this mid-to-high frequency processing area, which is eliminated by the outer metal plate. Simultaneously, the aforementioned sound-absorbing and damping materials are prone to performance degradation under long-term low-frequency vibration. Therefore, while existing sound insulation testing devices suppress low-frequency noise through metal plates and mid-to-high frequency noise through sound-absorbing and damping materials, low-frequency vibrations easily introduce these materials, leading to a decrease in the long-term stability of the sound insulation testing device. Introducing additional low-frequency noise reduction structures would undoubtedly result in a continuous accumulation of noise reduction structures required for the sound insulation testing device. Therefore, how to ensure the sound insulation performance and long-term stability of the sound insulation testing device across low, medium and high frequency bands within a limited space is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] This invention provides a sound insulation test chamber and a sound insulation test device to solve the technical problem that existing sound insulation test devices cannot simultaneously ensure sound insulation performance and long-term stability across low, medium, and high frequency bands within a limited space.

[0005] To achieve this objective, the present invention adopts the following technical solution: A sound insulation test chamber, comprising: An outer casing for low-frequency sound insulation, wherein the outer casing is configured with a first cavity; The inner shell is used for high-frequency sound insulation, is equipped with a second cavity, and is mounted on the cavity wall of the first cavity by a first support column; The test platform is disposed in the second cavity and is mounted on the cavity wall of the first cavity via a second support column; the inner shell is provided with a clearance hole corresponding to the position of the second support column; A damping layer, which is used for mid-frequency sound insulation, is disposed in the first cavity and located outside the inner shell, and has clearance holes opened at the positions corresponding to the first support column and the second support column; The end of the second support column away from the test platform is installed on the cavity wall of the first cavity through a leveling assembly. The leveling assembly includes multiple balancing parts, and the mass distribution of the multiple balancing parts is adjusted so that the natural frequency of the leveling assembly matches the low-frequency vibration frequency of the test platform.

[0006] Optionally, the balancing part includes a balancing column, the surface of which is formed with threads, and the balancing column is detachably connected to a plurality of balancing blocks via the threads.

[0007] Optionally, the balancing part further includes a balancing plate disposed on the cavity wall of the first cavity; one end of the balancing column is connected to the balancing plate, and the other end of the balancing column extends out of the cavity wall of the first cavity to the outside of the outer shell, and the portion extending to the outside of the outer shell is threaded, and at least one balancing block is threadedly connected to the balancing column and abuts against the outer wall surface of the outer shell.

[0008] Optionally, the leveling assembly further includes a clamping part disposed on the balancing part, and a plurality of clamping parts are arranged in a circumferential direction to form a clamping channel, the clamping channel being for one end of the second support column to be inserted.

[0009] Optionally, the clamping part includes a clamping vertical plate and a connecting plate. The clamping vertical plate is disposed on the balancing part, and the clamping vertical plate is configured with a clamping arc surface that matches the cylindrical curvature of the second support column. A connecting plate is provided on each side of the clamping vertical plate, and a connecting hole is provided on the connecting plate; between any two adjacent clamping parts, the two connecting plates of the two clamping vertical plates are fitted together, and the two connecting plates are connected by bolts passing through the connecting holes.

[0010] Optionally, the other end of the second support column near the test bench is provided with a mounting hole, and the test bench is connected to the test bench through the mounting hole; The second support column has a hollow channel on the outside of the mounting hole. The hollow channel extends along the axial direction of the second support column and extends to the position where the second support column is connected to the leveling component, but does not penetrate the second support column.

[0011] Optionally, the hollow channel includes a first channel, a second channel, and a third channel that are sequentially connected in a direction away from the test platform; along the axial direction of the second support column, the projection of the second channel is covered by the first channel, and the projection of the second channel is covered by the third channel.

[0012] Optionally, the second support column includes a support connection part, a support sleeve part, and an inner support part; the support sleeve part is installed on the cavity wall of the first cavity through a leveling assembly; the end face of the support sleeve part facing the test platform has an installation groove, the inner support part is detachably installed in the installation groove, the support connection part is detachably installed on the end face of the support sleeve part facing the test platform, and the installation hole is opened on the support connection part.

[0013] Optionally, the support connection portion has the first channel opened along the axial direction of the second support column, the inner support portion has the second channel and the first partial channel opened sequentially along the axial direction of the second support column, and the support sleeve portion has the second partial channel opened on the bottom wall of the mounting groove along the axial direction of the second support column; the first partial channel and the second partial channel are connected to form the third channel.

[0014] Optionally, the second channel and the first partial channel are connected and extend through the inner support portion along the axial direction of the second support column, and the length of the inner support portion matches the groove depth of the mounting groove.

[0015] Optionally, the outer shell is made of steel, the inner shell is made of molybdenum, and the damping layer is made of rubber.

[0016] A sound insulation testing device includes a sound insulation testing chamber as described above.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The sound insulation test chamber and equipment provided by this invention achieve overall multi-band sound insulation by using an outer shell for low-frequency sound insulation, a damping layer for mid-frequency sound insulation, and an inner shell for high-frequency sound insulation. Furthermore, the inner shell is mounted on the cavity wall of the first chamber via a first support column, and the test platform is mounted on the cavity wall of the first chamber via a second support column. This allows low-frequency vibrations generated by the workpiece to be directly transmitted to the outer shell, bypassing the inner shell and damping layer, reducing direct impact on the damping material and sound-absorbing structure, ensuring the long-term stability of the damping layer, and eliminating the need for additional low-frequency noise reduction structures on the inner shell. Simultaneously, the damping layer has clearance holes corresponding to the positions of the first and second support columns, ensuring that while dissipating mid-frequency vibration energy, it is unaffected by the vibration transmission path of the support columns, thus maintaining damping efficiency and sound insulation effect over time. In addition, a leveling component that matches the frequency of the low-frequency vibration is provided, improving the controllability of the transmission of low-frequency vibrations to the outer shell.

[0018] In summary, the sound insulation test chamber and sound insulation test equipment provided in this application can solve the technical problems of difficulty in simultaneously addressing low, medium and high frequency bands and insufficient long-term stability in existing technologies within a limited space, and significantly improve the overall performance and reliability of the sound insulation test device. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the sound insulation test chamber provided in an embodiment of the present invention; Figure 2 This is a top view of the sound insulation test chamber provided in an embodiment of the present invention; Figure 3 for Figure 2 A magnified schematic diagram of the local structure along point AA; Figure 4 This is a partial structural diagram of the sound insulation test chamber provided in an embodiment of the present invention; Figure 5 This is a top view of the second support column and leveling assembly in an embodiment of the present invention. Figure 6 for Figure 5 A schematic diagram of the cross-sectional structure along point BB; Figure 7 for Figure 6 A schematic diagram of the cross-sectional structure along point CC; Figure 8 for Figure 6 Schematic diagram of the cross-sectional structure along DD; Illustrations: 100, Outer shell; 101, First cavity; 200, Inner shell; 201, Second cavity; 300, Test platform; 410, First support column; 420, Second support column; 421, Mounting hole; 430, Hollow channel; 431, First channel; 432, Second channel; 433, Third channel; 4331, First partial channel; 4332, Second partial channel; 440, Support connection; 450, Support sleeve; 451, Mounting groove; 460, Inner support. 500, Leveling component; 510, Balancing part; 511, Balancing column; 512, Balancing block; 513, Balancing plate; 520, Clamping part; 521, Clamping vertical plate; 5211, Clamping curved surface; 522, Connecting plate; 5221, Connecting hole; 530, Clamping channel. Detailed Implementation

[0020] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art.

[0021] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0022] In the description of this invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component positioned centrally in the connection.

[0023] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1: The sound insulation test chamber provided in this embodiment can be applied to acoustic performance testing scenarios for workpieces such as mechanical equipment, electronic devices, and material samples. It is particularly suitable for sound insulation testing environments that require simultaneous suppression of low-frequency vibration, mid-frequency noise, and high-frequency noise within a limited space. It is understood that a sound insulation test chamber refers to a box structure used to form a relatively enclosed testing space, which can reduce the entry of external environmental noise into the testing area and also reduce the outward propagation of noise generated by the workpiece during the testing process. The testing equipment refers to equipment equipped with the sound insulation test chamber and capable of supporting, positioning, or assisting in the testing of the acoustic performance of the workpiece; for example, it can be a sound insulation testing device for motors, compressors, fans, loudspeakers, electronic components, or material samples.

[0025] Combination Figures 1 to 8 As shown, the sound insulation test chamber in this embodiment includes an outer shell 100, an inner shell 200, a test platform 300, a first support column 410, a second support column 420, and a damping layer (not shown). The outer shell 100 can be understood as the outer load-bearing structure of the sound insulation test chamber, forming a first cavity 101, primarily used for sound insulation of low-frequency sound waves or vibrations. The outer shell 100 is constructed of steel plates to form a closed first cavity 101, thereby reducing shell vibrations caused by external factors and vibrations from the test platform 300 through the plate mass and structural rigidity. Furthermore, the outer shell 100 can be mounted on the ground using rubber feet to enhance its low-frequency vibration resistance; that is, vibrations from the test platform 300 are transmitted to the outer shell 100 and then reduced by the outer shell 100, while other vibrations acting on the outer shell 100 are transmitted to and reduced by the outer shell 100. The sound insulation structure is reduced by 00; the inner shell 200 can be understood as a secondary sound insulation structure set inside the outer shell 100, which forms a second cavity 201 and is mainly used for sound insulation of high frequency noise; the test platform 300 can be understood as a load-bearing structure for the installation, placement or positioning of the workpiece to be tested, which is set in the second cavity 201 so that the workpiece can be acoustically tested in a relatively independent test space; the damping layer can be understood as an energy dissipation structure set between the outer shell 100 and the inner shell 200, which is mainly used for dissipating mid-frequency vibration energy or mid-frequency noise. In specific implementation, the damping layer can be selected as a rubber layer, a damping adhesive layer, a composite damping sheet or a material layer with viscoelastic energy dissipation capability.

[0026] Based on this, the inner shell 200 is installed on the cavity wall of the first cavity 101 via the first support column 410, and the test stage 300 is installed on the cavity wall of the first cavity 101 via the second support column 420. The inner shell 200 is provided with clearance holes at the positions corresponding to the second support column 420, and the damping layer is provided with clearance holes at the positions corresponding to the first support column 410 and the second support column 420.

[0027] It should be noted that this embodiment does not simply improve the sound insulation effect by increasing the thickness of the sound insulation material. Instead, low-frequency sound insulation, mid-frequency dissipation, and high-frequency sound insulation are respectively handled by the outer shell 100, the damping layer, and the inner shell 200. Furthermore, the support paths of the inner shell 200 and the test platform 300 are distinguished by the first support column 410 and the second support column 420. Specifically, the inner shell 200 is mounted on the cavity wall of the first cavity 101 via the first support column 410, and the test platform 300 is mounted on the cavity wall of the first cavity 101 via the second support column 420. This allows the low-frequency vibrations generated by the workpiece on the test platform 300 to be directly transmitted to the outer shell 100 via the second support column 420, without preferentially passing through the inner shell 200 and the damping layer. Therefore, the damping layer mainly undertakes the function of dissipating mid-frequency energy, the inner shell 200 mainly undertakes the function of high-frequency sound insulation, and the outer shell 100 mainly undertakes the function of low-frequency sound insulation, thereby reducing the long-term impact of low-frequency vibration on the damping layer and the inner shell 200, and reducing the possibility of the damping layer's performance degradation due to continuous low-frequency vibration.

[0028] That is, in this embodiment, low-frequency sound insulation is achieved through the outer shell 100, mid-frequency sound insulation through the damping layer, and high-frequency sound insulation through the inner shell 200, thereby achieving overall multi-band sound insulation. On this basis, the inner shell 200 is installed on the cavity wall of the first cavity 101 through the first support column 410, and the test platform 300 is installed on the cavity wall of the first cavity 101 through the second support column 420. This allows the low-frequency vibration generated by the workpiece to be directly transmitted to the outer shell 100, so that it does not pass through the inner shell 200 and the damping layer, reducing the direct impact on the damping material and sound absorption structure, ensuring the long-term stability of the damping layer, and eliminating the need to set up a low-frequency noise reduction structure on the inner shell 200. At the same time, the damping layer has clearance holes at the positions of the first support column 410 and the second support column 420, so that while dissipating the mid-frequency vibration energy, it is not affected by the vibration transmission path of the support columns (first support column 410 and second support column 420), thereby maintaining the damping efficiency and sound insulation effect without decreasing over time. In summary, the sound insulation test chamber provided in this embodiment can solve the technical problems of difficulty in simultaneously achieving sound insulation across low, medium, and high frequency bands and insufficient long-term stability in existing technologies within a limited space, significantly improving the overall performance and reliability of the sound insulation test device.

[0029] In this embodiment, the outer shell 100 is made of steel, the inner shell 200 is made of molybdenum, and the damping layer is made of rubber. More specifically, the outer shell 100 is made of thick cold-rolled low-carbon steel plate (model Q235B), the inner shell 200 is made of molybdenum alloy plate (TZM alloy), and the damping layer is made of high-molecular butyl rubber damping adhesive.

[0030] Understandably, the outer shell 100, as the main structure of the first cavity 101, uses thick cold-rolled low-carbon steel plates with high surface density and high rigidity to form a rigid boundary, which can effectively block the propagation of external low-frequency sound waves and suppress the intrusion of low-frequency noise at the source. It also bears the main load-bearing function of the test platform 300 and the inner shell 200. The inner shell 200 is located inside the outer shell 100 and is fixed to the cavity wall of the outer shell 100 by the first support column 410. This ensures that while providing high-frequency sound insulation, the vibration of the inner shell 200 does not directly act on the damping layer, thereby reducing the transmission of low-frequency vibrations through the inner shell 200 to the damping layer and mitigating the mid-to-high frequency sound insulation dip caused by low-frequency interference. The test platform 300 is directly connected to the cavity wall of the outer shell 100 via the second support column 420 instead of the inner shell 200. This allows the low-frequency vibrations generated by the workpiece to be directly transmitted to the outer shell 100 without passing through the inner shell 200 and the damping layer, avoiding interference with the damping material and ensuring the stability of the test platform 300 and its structural stability during long-term use. The damping layer is disposed outside the inner shell 200, and clearance holes are provided at the positions of the first support column 410 and the second support column 420. This ensures that while dissipating mid-frequency vibration energy, it is not affected by the vibration transmission path of the support columns, thus maintaining the damping efficiency and sound insulation effect without decreasing over time. Through the outer shell 100 bearing low-frequency sound insulation, the inner shell 200 achieving high-frequency sound insulation, the damping layer dissipating mid-frequency energy, and the rational layout of the support columns, the technical solution of this embodiment can form a multi-layer composite sound insulation structure within a limited space, effectively balancing the sound insulation requirements of low, mid, and high frequencies. Simultaneously, it prevents low-frequency vibrations from affecting the damping and sound-absorbing materials through the internal structure, achieving the goal of long-term stable use of the device. Therefore, this technical solution can systematically solve the technical problems of difficulty in simultaneously addressing low, mid, and high frequency multi-band sound insulation and insufficient long-term stability in existing technologies, significantly improving the overall performance and reliability of the sound insulation testing device.

[0031] In this embodiment, the first support column 410 and the second support column 420 can be connected by welding. That is, the first support column 410 is connected to the outer shell 100 and the inner shell 200 by welding, and the second support column 420 is connected to the outer shell 100 and the test platform 300 by welding.

[0032] Example 2: As another embodiment of the present invention, the main difference between the sound insulation test chamber in this embodiment and that in Embodiment 1 lies in the different arrangement of the second support column 420. Specifically, as shown... Figures 4 to 8 As shown, the end of the second support column 420 away from the test platform 300 is installed on the cavity wall of the first cavity 101 through the leveling component 500. The leveling component 500 includes a plurality of balancing parts 510, and the mass distribution of the plurality of balancing parts 510 is adjusted so that the natural frequency of the leveling component 500 matches the low-frequency vibration frequency of the test platform 300.

[0033] It is understandable that by mounting the end of the second support column 420 away from the test platform 300 onto the cavity wall of the first cavity 101 via the leveling component 500, the test platform 300 is not directly and rigidly fixed to the cavity wall of the outer shell 100. Instead, the leveling component 500 forms an adjustable transition support node. This transition support node can support and level the test platform 300, ensuring that the test platform 300 maintains a stable bearing posture within the second cavity 201 and reducing workpiece vibration displacement caused by tilting, off-center loading, or assembly errors of the test platform 300. On the other hand, the leveling component 500 is located on the low-frequency vibration transmission path of the test platform 300, allowing the low-frequency vibration generated by the test platform 300 to undergo frequency matching and energy distribution via the leveling component 500 before being transmitted to the outer shell 100 via the second support column 420, thereby improving the controllability of the transmission of low-frequency vibration to the outer shell 100.

[0034] As an optional implementation, the balancing part 510 includes a balancing column 511, the cylindrical surface of which is formed with threads, and the balancing column 511 is detachably connected to a plurality of balancing blocks 512 via the threads.

[0035] The balancing part 510 also includes a balancing plate 513, which is disposed on the cavity wall of the first cavity 101; one end of the balancing column 511 is connected to the balancing plate 513, and the other end of the balancing column 511 extends out of the cavity wall of the first cavity 101 to the outside of the outer shell 100, and the portion extending to the outside of the outer shell 100 is threaded; at least one balancing block 512 is threadedly connected to the balancing column 511 and abuts against the outer wall surface of the outer shell 100.

[0036] Specifically, threads are formed on the cylindrical surface of the balance column 511, allowing the balance block 512 to be detachably connected to the balance column 511 via these threads. This transforms the balancing section 510 from a fixed-mass support structure into a counterweight structure capable of mass adjustment according to testing requirements. The balance column 511 can be understood as a columnar mounting base for supporting and positioning the balance block 512. It serves as part of the leveling assembly 500 for structural support and provides mounting positions for the balance block 512 along its axial or circumferential direction. The balance block 512 can be understood as a counterweight used to change the local mass of the balancing section 510. In practice, the balance block 512 can be an annular block, a nut-shaped counterweight, a sleeve-shaped counterweight, or a metal block with internal threads. Because of the threads on the cylindrical surface of the balance column 511, the balance block 512 can be installed, removed, or its position adjusted by screwing. Therefore, when it is necessary to change the overall mass distribution of the leveling assembly 500, the operator can increase or decrease the number of balance blocks 512, or adjust the connection position of the balance blocks 512 on the balance column 511, so that different mass distribution states are formed among the multiple balancing parts 510. Compared with the one-piece molded counterweight method, this threaded connection structure can complete the mass adjustment without damaging the original structure of the leveling assembly 500, and has the advantages of convenient assembly, high adjustment accuracy and good reusability.

[0037] Furthermore, if the workpieces to be tested carried by the test bench 300 are different, or if the low-frequency vibration frequency generated by the workpieces to be tested changes during the test, the local mass of the balancing part 510 can be changed by replacing the balance blocks 512 with different masses, increasing or decreasing the number of balance blocks 512, or changing the screw-in position of the balance blocks 512 on the balance column 511, thereby adjusting the natural frequency of the leveling component 500. Since the natural frequency of the leveling component 500 is related to its mass distribution, the detachable threaded connection between the balance column 511 and the balance blocks 512 can provide the leveling component 500 with adjustable frequency matching capability, making it easier for the leveling component 500 to match the low-frequency vibration frequency of the test bench 300.

[0038] Meanwhile, the balance block 512 is threadedly connected to the balance column 511, forming a relatively stable mechanical fit after connection. This allows the balance part 510 to be firmly secured to the outer shell 100, preventing significant detachment or displacement under low-frequency vibration. The threaded structure also provides a certain locking effect on the position of the balance block 512 on the balance column 511, thereby maintaining the stability of the mass distribution of the balance part 510 during long-term operation of the sound insulation test chamber. This prevents changes in the natural frequency of the leveling component 500 due to loosening or displacement of the balance block 512, thus ensuring that the low-frequency vibration of the test bench 300 is stably transmitted to the outer shell 100 along the second support column 420, the leveling component 500, and the cavity wall of the first cavity 101.

[0039] Furthermore, the leveling assembly 500 also includes a clamping part 520 disposed on the balancing part 510. Multiple clamping parts 520 are arranged in a circumferential direction to form a clamping channel 530, and the clamping channel 530 is for inserting one end of the second support column 420.

[0040] Specifically, the clamping part 520 includes a clamping vertical plate 521 and a connecting plate 522. The clamping vertical plate 521 is disposed on the balancing part 510. The clamping vertical plate 521 is provided with a clamping arc surface 5211 that matches the cylindrical arc of the second support column 420. A connecting plate 522 is provided on each side of the clamping vertical plate 521. A connecting hole 5221 is provided on the connecting plate 522. Between any two adjacent clamping parts 520, the two connecting plates 522 of the two clamping vertical plates 521 are fitted together, and the two connecting plates 522 are connected by bolts passing through the connecting hole 5221.

[0041] It is understood that by providing clamping parts 520 on the balancing part 510 and forming a clamping channel 530 by arranging multiple clamping parts 520 in a circumferential direction, one end of the second support column 420 can be inserted into the clamping channel 530 and circumferentially limited. Here, the clamping part 520 can be understood as a connection structure used to position, clamp, or constrain the second support column 420 from its outer periphery; the clamping channel 530 can be understood as an installation space formed by multiple clamping parts 520, the shape of which can be adapted to the outer contour of the second support column 420. For example, when the second support column 420 is a cylindrical structure, the clamping channel 530 can be an approximately circular channel, so that the second support column 420 can be subjected to a more uniform circumferential clamping effect after insertion.

[0042] Since the clamping part 520 is disposed on the balancing part 510, and the balancing block 512 is threadedly connected to the balancing column 511, a relatively stable mechanical fit can be formed after the connection, and the balancing part 510 can be fastened to the housing 100. Therefore, the balancing part 510 can not only serve as the counterweight adjustment structure of the leveling assembly 500, but also as a stable mounting base for the clamping part 520. In other words, after the balancing block 512 is threadedly connected to the balancing column 511, on the one hand, the mass distribution of the balancing part 510 can be adjusted, and on the other hand, the connection stability between the balancing part 510 and the housing 100 can be improved through the threaded locking action, so that the clamping part 520 is less likely to shake, shift or loosen when clamping the second support column 420.

[0043] Furthermore, after one end of the second support column 420 is inserted into the clamping channel 530, its outer periphery is surrounded and constrained by multiple clamping parts 520 arranged circumferentially. Compared to a single-sided abutment or point support structure, the arrangement of multiple clamping parts 520 arranged circumferentially makes the radial force on the second support column 420 more balanced, thereby reducing the lateral sway of the second support column 420 during low-frequency vibration transmission. Since the second support column 420 is used to transmit the low-frequency vibration of the test bench 300 to the cavity wall of the first cavity 101 and the outer shell 100, if the connection between the second support column 420 and the leveling assembly 500 is unstable, it is easy to cause the vibration transmission path to deviate, and further affect the levelness of the test bench 300 and the long-term stability of the sound insulation test chamber. In this embodiment, the clamping channel 530 circumferentially limits the second support column 420, enabling it to be more stably maintained in the predetermined installation position. This improves the directionality and stability of low-frequency vibration transmission along the second support column 420, the leveling component 500, and the outer shell 100. Simultaneously, since the clamping part 520 is located on the balancing part 510, and the balancing part 510 is secured to the outer shell 100 via the threaded engagement of the balancing block 512 and the balancing column 511, the vibration experienced by the second support column 420 can be reliably transmitted to the balancing part 510 via the clamping part 520, and then from the balancing part 510 to the outer shell 100. Thus, the low-frequency vibration generated by the test bench 300 is less likely to form loose contact or localized vibrations at the connection between the second support column 420 and the leveling component 500, and is less likely to diffuse into the inner shell 200 or the damping layer. Instead, it is guided along a predetermined structural path to the outer shell 100, allowing the outer shell 100 to perform low-frequency sound insulation and low-frequency vibration suppression functions. Therefore, the technical solution of this embodiment is beneficial to reducing the interference of low-frequency vibration on the mid-frequency dissipation state of the damping layer and the high-frequency sound insulation state of the inner shell 200.

[0044] Example 3: The sound insulation test chamber of this embodiment optimizes the specific structure of the second support column 420 based on Embodiments 1 and 2. Specifically, the other end of the second support column 420 near the test platform 300 has a mounting hole 421, through which the test platform 300 is connected; a hollow channel 430 is formed on the outside of the mounting hole 421 on the second support column 420, extending axially along the second support column 420 and extending to the position where the second support column 420 is connected to the leveling component 500, without penetrating the second support column 420.

[0045] It is understandable that by opening a mounting hole 421 at one end of the second support column 420 near the test platform 300, the test platform 300 can be connected to the second support column 420 through the mounting hole 421. The mounting hole 421 can be understood as a connection hole for bolts, pins, connecting rods, or other fasteners to pass through, forming a defined connection position between the test platform 300 and the second support column 420. Since the test platform 300 is used to support the workpiece under test, the vibration generated by the workpiece during the test will first act on the test platform 300, and then be transmitted to the second support column 420. Therefore, the mounting hole 421 enables a relatively stable structural connection between the test platform 300 and the second support column 420, reducing the offset, shaking, or changes in assembly position of the test platform 300 during the test, thereby improving the load-bearing stability of the test platform 300 and the consistency of the acoustic test results.

[0046] Based on this, a hollow channel 430 is formed on the outside of the mounting hole 421 in the second support column 420. This hollow channel 430 can be understood as a vibration-damping channel set inside the second support column 420 or in a local wall, used to reduce the acoustic vibration energy transmitted from the test bench 300 to the outer shell 100. Since the hollow channel 430 is set on the outside of the mounting hole 421, that is, the hollow channel 430 avoids the main connection area where the mounting hole 421 is located, it will not significantly damage the connection strength between the mounting hole 421 and the fasteners, nor will it weaken the basic load-bearing relationship between the test bench 300 and the second support column 420. Therefore, the second support column 420 can, while ensuring the reliable installation of the test bench 300, additionally form a structural path for reducing acoustic vibration energy. In a preferred embodiment, the hollow channel 430 extends axially along the second support column 420 and extends to the position where the second support column 420 connects with the leveling assembly 500. This allows vibrations or acoustic energy generated near the test platform 300 to be attenuated and guided to the leveling assembly 500 along the axial direction of the second support column 420. This facilitates the outer shell 100 in providing low-frequency sound insulation and low-frequency vibration suppression, reducing the impact of low-frequency vibrations on the inner shell 200 and the damping layer.

[0047] Meanwhile, the hollow channel 430 extends to the position where the second support column 420 connects to the leveling component 500, enabling a more continuous acoustic vibration transmission path between the second support column 420 and the leveling component 500. Since the multiple balancing parts 510 of the leveling component 500 can be adjusted through mass distribution to match their natural frequency with the low-frequency vibration frequency of the test bench 300, when the hollow channel 430 guides the weakened low-frequency acoustic vibration energy to the leveling component 500, the leveling component 500 can more effectively participate in the matching, transmission, and guidance of low-frequency vibrations, thereby improving the overall noise reduction effect.

[0048] It should be noted that the hollow channel 430 does not penetrate the second support column 420. "Not penetrating" here can be understood as the hollow channel 430 not completely passing through both ends of the second support column 420, but rather forming a channel structure with closed or partially closed ends inside the second support column 420. In this embodiment, preferably, the hollow channel 430 is opened from one end of the second support column 420 near the test platform 300 and is opened axially, with a gap between the opening depth and the other end of the second support column 420 (i.e., the hollow channel 430 passes through one end of the second support column 420, but not through the other end). This arrangement avoids the second support column 420 from forming a direct sound leakage path due to the through hole, preventing sound from inside the second cavity 201 from directly leaking to the outside of the outer shell 100 or other unintended locations through the second support column 420. At the same time, the non-through setting can also preserve the solid connection area at the end of the second support column 420, so that the second support column 420 still has sufficient support strength and vibration resistance stability, reducing the risk of decreased stiffness, local stress concentration or fatigue damage to the second support column 420 due to excessive opening.

[0049] Therefore, the mounting hole 421 ensures a reliable connection between the test bench 300 and the second support column 420, allowing vibrations generated by the workpiece under test to stably enter the second support column 420. The hollow channel 430 guides acoustic energy to the leveling component 500 along the axial direction of the second support column 420 without compromising the connection strength of the mounting hole 421. The hollow channel 430 does not penetrate the second support column 420, thus avoiding the formation of a through-type sound leakage path and maintaining the structural integrity of the second support column 420. Therefore, the above arrangement can simultaneously achieve the fixation of the test bench 300, low-frequency vibration guidance, sound leakage suppression, and structural reliability within a limited space, thereby further improving the multi-band sound insulation effect and long-term stability of the sound insulation test chamber in this embodiment.

[0050] like Figures 6 to 8 As shown, the hollow channel 430 includes a first channel 431, a second channel 432, and a third channel 433 connected sequentially along a direction away from the test platform 300; along the axial direction of the second support column 420, the projection of the second channel 432 is covered by the first channel 431, and the projection of the second channel 432 is covered by the third channel 433. In this embodiment, as... Figure 5 As shown, along the axial direction, the cross-sectional profile of the first channel 431 is a groove extending along a circular arc, and the cross-sectional profile of the second channel 432 is a hole, as shown. Figure 8 As shown, the cross-sectional profile of the third channel 433 is a groove extending along a circular arc, and the cross-sectional area of ​​the first channel 431 is greater than or equal to the cross-sectional area of ​​the third channel 433. The cross-sectional areas of the first channel 431 and the third channel 433 are both greater than the cross-sectional area of ​​the second channel 432.

[0051] It can be understood that the first channel 431 can be understood as the entry section near the test bench 300, used to receive the acoustic energy transmitted by the test bench 300; the second channel 432 can be understood as the transition section connecting the first channel 431 and the third channel 433; and the third channel 433 can be understood as the output section near the leveling component 500, used to continue guiding the acoustic energy to the leveling component 500. Since the three are connected sequentially in the direction away from the test bench 300, the low-frequency acoustic energy generated by the test bench 300 can be guided to the location of the leveling component 500 by being gradually weakened along the axial direction of the second support column 420.

[0052] Furthermore, in this embodiment, along the axial direction, the cross-sectional profile of the first channel 431 is a groove extending along an arc, the cross-sectional profile of the third channel 433 is also a groove extending along an arc, and the cross-sectional profile of the second channel 432 is a hole. Since the first channel 431 is close to the test platform 300, its groove structure extending along an arc can provide a larger acoustic vibration receiving area near the connection area between the test platform 300 and the second support column 420, making it easier for the acoustic vibration energy transmitted from the test platform 300 to enter the hollow channel 430; the third channel 433 is close to the leveling component 500, and its groove structure extending along an arc can allow the guided acoustic vibration energy to be transmitted to the area where the leveling component 500 is located with a larger range of action, thereby improving the response effect of the leveling component 500 to low-frequency vibrations.

[0053] Meanwhile, the cross-sectional profile of the second channel 432 is perforated, and the cross-sectional areas of the first channel 431 and the third channel 433 are both larger than that of the second channel 432, forming a variable cross-section structure of "expansion-convergence-expansion" between the first channel 431 and the third channel 433 in the hollow channel 430. This structure can receive the acoustic energy at the test platform 300 through the larger cross-sectional area of ​​the first channel 431, and concentrate and constrain the acoustic energy through the smaller cross-sectional area of ​​the second channel 432, making it less likely for the acoustic energy to diffuse disorderly to the circumference of the second support column 420 in the intermediate transition section. Subsequently, the acoustic energy is extended again through the third channel 433 to a position close to the leveling component 500, allowing the leveling component 500 to receive the acoustic energy with a sufficient contact range. Thus, the hollow channel 430 can improve the concentration and continuity of the low-frequency acoustic energy transmission along the predetermined direction.

[0054] Furthermore, both the first channel 431 and the third channel 433 adopt a groove-shaped structure extending along an arc, which can also be adapted to the columnar shape or circumferential structure of the second support column 420. In specific implementation, the second support column 420 usually needs to maintain a certain axial load-bearing capacity and bending stiffness. If a large-area through-hole structure is used, it is easy to cause a decrease in the local strength of the support column. In this embodiment, the first channel 431 and the third channel 433 with arc-shaped grooves form a sound transmission space within the local arc range, while maintaining the continuity of other solid parts of the second support column 420, thereby achieving a balance between sound vibration guidance and structural strength. The second channel 432 adopts a hole-shaped structure with a smaller cross section, which can further reduce the weakening of the solid strength of the second support column 420 by the intermediate transition area, so that the second support column 420 still has good long-term vibration stability while bearing the test platform 300.

[0055] like Figure 4 and Figure 6 As shown, the second support column 420 includes a support connecting part 440, a support sleeve part 450, and an inner support part 460. The support sleeve part 450 is installed on the cavity wall of the first cavity 101 via a leveling assembly 500. An installation groove 451 is provided on the end face of the support sleeve part 450 facing the test stage 300. The inner support part 460 is detachably installed in the installation groove 451. The support connecting part 440 is detachably installed on the end face of the support sleeve part 450 facing the test stage 300, and a mounting hole 421 is provided on the support connecting part 440. The detachable installation methods of the support connecting part 440 include, but are not limited to, snap-fit, interlocking, and interference fit.

[0056] For example, when installing the test bench 300, the number of balance blocks 512 of the leveling component 500 should be adjusted according to the low frequency of the current test environment so that the frequencies of the two match. Then, the support sleeve 450 is extended from the second cavity 201 into the first cavity 101, so that the part of the support sleeve 450 extending into the first cavity 101 can be inserted into the clamping channel 530 of the leveling component 500. Then, the inner support 460 is inserted into the mounting groove 451 of the support sleeve 450. Next, the support connection 440 is installed on the end face of the support sleeve 450 facing the test bench 300. At this time, the support connection 440 is supported on the support sleeve 450 and located in the second cavity 201. By analogy, after all the second support columns 420 are assembled, the test bench 300 can be set on each of the second support columns 420.

[0057] Furthermore, the second channel 432 and the first partial channel 4331 are connected and extend through the inner support portion 460 along the axial direction of the second support column 420. The length of the inner support portion 460 matches the groove depth of the mounting groove 451. That is, as Figure 5 and Figure 6As shown, the support connection 440 has a first channel 431 along the axial direction of the second support column 420, and the length of the first channel 431 is a first length D1; Figure 6 and Figure 7 As shown, the inner support portion 460 has a second channel 432 and a first partial channel 4331 sequentially formed along the axial direction of the second support column 420. The length of the second channel 432 is a second length D2. The support sleeve portion 450 has a second partial channel 4332 formed along the axial direction of the second support column 420 on the bottom wall of the mounting groove 451. The first partial channel 4331 and the second partial channel 4332 are joined to form a third channel 433, and the length of the third channel 433 is a third length D3. The groove depth of the mounting groove 451 is a fourth length D4, which is the sum of the lengths of the second channel 432 and the first partial channel 4331.

[0058] The above configuration means that the length of the second channel 432 is controlled by the inner support 460. This means that by replacing the inner support 460, different lengths of the second channel 432 and the first partial channel 4331 can be matched, thereby changing the ratio of the second length D2 of the second channel 432 and the third length D3 of the third channel 433 in the second support column 420. This alters the transmission path and standing wave distribution of low-frequency vibrations within the channel, allowing acoustic energy to be transmitted more effectively along a predetermined axis to the leveling component 500 and the outer shell 100, improving the guiding efficiency of low-frequency vibrations. Furthermore, to adapt to test benches 300 and workpieces of different heights, weights, or vibration characteristics, only the length of the inner support 460 needs to be adjusted to match different low-frequency vibration wavelengths, thus ensuring the frequency response of the hollow channel 430 matches the natural frequency of the leveling component 500. Furthermore, the aforementioned modular length adjustment method does not require modification of the main structure of the second support column 420 or the outer shell 100, thus maintaining the axial stiffness of the second support column 420 and reducing low-frequency vibration energy leakage caused by mismatch in fixing hole positions or channel lengths, thereby enhancing the long-term stability of the sound insulation test chamber.

[0059] To facilitate understanding by those skilled in the art, the optimal implementation scheme in this embodiment is described; The sound insulation test chamber in this embodiment includes an outer shell 100, an inner shell 200, a test platform 300, a first support column 410, a second support column 420, and a damping layer. The inner shell 200 is mounted on the cavity wall of the first cavity 101 via the first support column 410, and the test platform 300 is mounted on the cavity wall of the first cavity 101 via the second support column 420. The inner shell 200 has clearance holes corresponding to the positions of the second support column 420, and the damping layer has clearance holes corresponding to the positions of the first support column 410 and the second support column 420. Thus, the outer shell 100 mainly provides low-frequency vibration isolation, the damping layer mainly provides mid-frequency vibration dissipation, and the inner shell 200 mainly provides high-frequency sound insulation. This avoids continuous impact of low-frequency vibrations on the damping layer and the inner shell 200, reducing the risk of damping layer fatigue attenuation and vibration coupling of the inner shell 200, thereby achieving coordinated and stable sound insulation performance across low, mid, and high frequency bands within a limited space.

[0060] The end of the second support column 420 away from the test stage 300 is mounted on the cavity wall of the first cavity 101 via a leveling assembly 500. The leveling assembly 500 includes multiple balancing parts 510, the mass distribution of which is adjusted so that the natural frequency of the leveling assembly 500 matches the low-frequency vibration frequency of the test stage 300. Each balancing part 510 includes a balancing column 511 with threads formed on its surface. Several balancing blocks 512 are detachably connected to the balancing column 511 via these threads. The balancing part 510 also includes a balancing plate 513, which is disposed on the cavity wall of the first cavity 101. One end of the balancing column 511 is connected to the balancing plate 513, and the other end of the balancing column 511 extends beyond the cavity wall of the first cavity 101 to the outside of the outer casing 100, with threads forming on the portion extending outside the outer casing 100. At least one balancing block 512 is threadedly connected to the balancing column 511 and abuts against the outer wall of the outer casing 100. Therefore, the leveling component 500 not only supports and levels the test bench 300, but also forms a guiding and frequency-adapting structure for low-frequency vibration, improving the directionality and stability of low-frequency vibration transmission. Furthermore, the mass distribution of the balancing part 510 can be changed by adding, reducing, or adjusting the position of the balance blocks 512, thereby adjusting the natural frequency of the leveling component 500 to adapt to different test benches 300, different workpieces, and different low-frequency vibration conditions. Simultaneously, the balance blocks 512 form a stable mechanical fit through threaded connections, ensuring that the balancing part 510 can be reliably secured to the outer casing 100. This enhances the vibration transmission stability between the second support column 420 and the outer casing 100, reduces loosening, swaying, or leakage of low-frequency vibration at the connection points, and improves structural reliability under long-term use.

[0061] The second support column 420 includes a support connecting part 440, a support sleeve part 450, and an inner support part 460. The support sleeve part 450 is installed on the cavity wall of the first cavity 101 through a leveling assembly 500. The end face of the support sleeve part 450 facing the test table 300 is provided with a mounting groove 451. The inner support part 460 is detachably installed in the mounting groove 451. The support connecting part 440 is detachably installed on the end face of the support sleeve part 450 facing the test table 300, and a mounting hole 421 is opened on the support connecting part 440. The test table 300 is connected to the support connecting part 440 through the mounting hole 421.

[0062] The support connection 440 has a first channel 431 along the axial direction of the second support column 420, and the length of the first channel 431 is a first length D1; Figure 6 and Figure 7 As shown, the inner support portion 460 has a second channel 432 and a first partial channel 4331 sequentially formed along the axial direction of the second support column 420. The length of the second channel 432 is the second length D2. The support sleeve portion 450 has a second partial channel 4332 formed along the axial direction of the second support column 420 on the bottom wall of the mounting groove 451. The first partial channel 4331 and the second partial channel 4332 are connected to form a third channel 433, and the length of the third channel 433 is the third length D3. The groove depth of the mounting groove 451 is the fourth length D4, which is the sum of the lengths of the second channel 432 and the first partial channel 4331. By adjusting the ratio of the second length D2 and the third length D3, the propagation path, propagation time, and standing wave distribution of low-frequency vibration inside the second support column 420 can be changed, thereby changing the response characteristics of low-frequency vibration at the leveling component 500 and realizing the adaptive guidance of low-frequency vibration at different frequencies.

[0063] In summary, the sound insulation test chamber in this embodiment forms a multi-band sound insulation system encompassing low, medium, and high frequencies through the outer shell 100, damping layer, and inner shell 200. An independent low-frequency vibration transmission path is formed through the first support column 410, the second support column 420, and clearance holes. An adjustable inherent frequency structure is formed through the leveling component 500 and multiple balancing parts 510, enabling frequency matching between low-frequency vibrations and the leveling component 500. Mass distribution adjustment and stable fastening are achieved through the threaded engagement of the balancing block 512 and the balancing column 511. A modular second support column 420 structure is formed through the support connection part 440, the support sleeve part 450, and the inner support part 460. An adjustable-length variable-section sound transmission structure is formed through the first channel 431, the second channel 432, and the third channel 433, thereby achieving directional guidance, continuous transmission, and frequency adaptation of low-frequency vibrations. Therefore, within a limited space, the test bench can be designed to support stability, guide low-frequency vibration, damping stability, and sound insulation performance at high frequencies, significantly improving the multi-band sound insulation capability, long-term stability, and adaptability to different test conditions of the sound insulation test chamber.

[0064] Example 4: like Figure 1 As shown, this embodiment provides a sound insulation testing device, including the sound insulation testing chambers described in embodiments one, two, and three. A noise detection device is installed on the test bench 300. The noise detection device refers to a structure capable of detecting noise, such as a decibel meter or a sound wave receiver. This embodiment is not limited to this type of device; it is sufficient to acquire noise data.

[0065] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sound insulation testing chamber, characterized in that, include: The housing (100) is used for low-frequency sound insulation and is provided with a first cavity (101). The inner shell (200) is used for high-frequency sound insulation, and is equipped with a second cavity (201), and is installed on the cavity wall of the first cavity (101) by a first support column (410); The test platform (300) is disposed in the second cavity (201) and is mounted on the cavity wall of the first cavity (101) by means of the second support column (420); the inner shell (200) is provided with a clearance hole corresponding to the position of the second support column (420); A damping layer, which is used for mid-frequency sound insulation, is disposed in the first cavity (101) and located outside the inner shell (200), and has clearance holes at the positions corresponding to the first support column (410) and the second support column (420); The end of the second support column (420) away from the test stage (300) is mounted on the cavity wall of the first cavity (101) via a leveling assembly (500). The leveling assembly (500) includes a plurality of balancing parts (510), and the mass distribution of the plurality of balancing parts (510) is adjusted so that the natural frequency of the leveling assembly (500) matches the low-frequency vibration frequency of the test stage (300).

2. The sound insulation test chamber according to claim 1, characterized in that, The balancing part (510) includes a balancing column (511), on which threads are formed, and the balancing column (511) is detachably connected to a plurality of balancing blocks (512) by the threads.

3. The sound insulation test chamber according to claim 2, characterized in that, The balancing part (510) further includes a balancing plate (513), which is disposed on the cavity wall of the first cavity (101); one end of the balancing column (511) is connected to the balancing plate (513), and the other end of the balancing column (511) extends out of the cavity wall of the first cavity (101) to the outside of the outer shell (100), and the portion extending to the outside of the outer shell (100) is threaded; at least one balancing block (512) is threadedly connected to the balancing column (511) and abuts against the outer wall surface of the outer shell (100).

4. The sound insulation test chamber according to claim 2, characterized in that, The leveling assembly (500) further includes a clamping part (520) disposed on the balancing part (510), and a plurality of clamping parts (520) are arranged in a circumferential direction to form a clamping channel (530), and the clamping channel (530) is for one end of the second support column (420) to be inserted.

5. The sound insulation test chamber according to claim 4, characterized in that, The clamping part (520) includes a clamping vertical plate (521) and a connecting plate (522). The clamping vertical plate (521) is disposed on the balancing part (510). The clamping vertical plate (521) is provided with a clamping arc surface (5211) that matches the cylindrical arc of the second support column (420). A connecting plate (522) is provided on each side of the clamping vertical plate (521), and a connecting hole (5221) is provided on the connecting plate (522). Between any two adjacent clamping parts (520), the two connecting plates (522) of the two clamping vertical plates (521) are fitted together, and the two connecting plates (522) are connected by bolts passing through the connecting hole (5221).

6. The sound insulation test chamber according to claim 1, characterized in that, The second support column (420) has a mounting hole (421) at the other end near the test table (300), and the test table (300) is connected to the test table (300) through the mounting hole (421); The second support column (420) has a hollow channel (430) on the outside of the mounting hole (421). The hollow channel (430) extends along the axial direction of the second support column (420) and extends to the position where the second support column (420) is connected to the leveling component (500), but does not penetrate the second support column (420).

7. The sound insulation test chamber according to claim 6, characterized in that, The hollow channel (430) includes a first channel (431), a second channel (432) and a third channel (433) connected sequentially in a direction away from the test platform (300); along the axial direction of the second support column (420), the projection of the second channel (432) is covered by the first channel (431), and the projection of the second channel (432) is covered by the third channel (433).

8. The sound insulation test chamber according to claim 7, characterized in that, The second support column (420) includes a support connecting part (440), a support sleeve part (450), and an inner support part (460); the support sleeve part (450) is installed on the cavity wall of the first cavity (101) through a leveling component (500); the end face of the support sleeve part (450) facing the test platform (300) is provided with an installation groove (451), the inner support part (460) is detachably installed in the installation groove (451), the support connecting part (440) is detachably installed on the end face of the support sleeve part (450) facing the test platform (300), and the installation hole (421) is opened on the support connecting part (440).

9. A sound insulation test chamber according to claim 8, characterized in that, The support connection part (440) is provided with the first channel (431) along the axial direction of the second support column (420). The inner support part (460) is provided with the second channel (432) and the first partial channel (4331) in sequence along the axial direction of the second support column (420). The support sleeve part (450) is provided with the second partial channel (4332) along the axial direction of the second support column (420) at the bottom wall of the mounting groove (451). The first partial channel (4331) and the second partial channel (4332) are connected to form the third channel (433).

10. A sound insulation test chamber according to claim 9, characterized in that, The second channel (432) and the first partial channel (4331) are connected and pass through the inner support (460) along the axial direction of the second support column (420). The length of the inner support (460) matches the groove depth of the mounting groove (451).

11. A sound insulation test chamber according to any one of claims 1-10, characterized in that, The outer shell (100) is made of steel, the inner shell (200) is made of molybdenum, and the damping layer is made of rubber.

12. A sound insulation testing device, characterized in that, Including the sound insulation test chamber as described in any one of claims 1-11.

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