A headphone shell noise testing device

Abstract

The present invention provides a headphone shell noise testing device, which relates to the field of acoustic testing technology, including an operating table, a product fixture, a plurality of motor drive modules and an electric control element module; the operating table includes a main sealed box, a product fixing area arranged above the main sealed box, an electric control element area arranged in the main sealed box, and a plurality of sub-sealed boxes arranged in the product fixing area; the product fixture is arranged in the product fixing area; the output shaft of the motor drive module passes through the sub-sealed box and is connected to the product fixture; the shells of the main sealed box and the sub-sealed box each include a metal layer, a composite plate layer, a damping material layer and a sound-absorbing material layer arranged in sequence from the outside to the inside, and the metal layer, the composite plate layer and the damping material layer are provided with array-distributed and staggered conical silencing cavities. The present invention significantly improves the low-frequency sound insulation effect and ensures the accuracy of the test data through the design of a multi-layer composite sound insulation structure and a conical silencing cavity.

Description

Technical Field

[0001] The invention relates to the technical field of acoustic testing, and in particular to an earphone shell noise testing device. Background Art

[0002] Acoustic testing equipment plays a vital role in the production line of modern acoustic and electrical products, especially for noise testing of small precision acoustic and electrical components such as headphone shells.

[0003] However, the soundproof boxes currently on the market for such tests generally have insufficient low-frequency sound insulation performance. With the continuous sophistication of audio-visual products, the requirements for the low-frequency sound insulation performance of soundproof boxes are becoming increasingly higher. Although traditional soundproof boxes can improve the sound insulation effect by increasing the wall thickness, this method has limited effect on low-frequency sounds, especially in the frequency range of around 100 Hz, because low-frequency sounds have strong penetrating power and it is difficult to effectively block them by simply increasing the wall thickness. In addition, traditional soundproof boxes usually adopt an integrated door sealing design, which can only be adapted to a fixed inner box installation method and lacks flexibility. More importantly, due to the fixed structure of the inner box, it is impossible to effectively isolate the vibration interference caused by the external environment, resulting in unsatisfactory sound insulation effect in actual use. Therefore, how to overcome the problem in the prior art that the soundproof box cannot effectively isolate external vibration interference and thus improve the overall sound insulation effect is a technical problem that needs to be solved urgently. Summary of the invention

[0004] The purpose of the present invention is to provide an earphone shell noise testing device, which can achieve better sound insulation and noise reduction effects through improved sound insulation box structure design and material combination application, so as to better meet the needs of modern acoustic and electrical product testing.

[0005] To achieve the above object, the present invention is implemented through the following technical solutions:

[0006] An earphone shell noise testing device comprises an operating table, a product fixture, a plurality of motor drive modules and an electric control component module;

[0007] The operating table includes a main sealed box, a product fixing area arranged above the main sealed box, an electric control component area arranged in the main sealed box, and a plurality of sub-sealed boxes arranged in the product fixing area; the product fixture is arranged in the product fixing area;

[0008] The motor drive module is arranged in the product fixing area and is sealed by the corresponding sub-sealing box, and the output shaft of the motor drive module passes through the sub-sealing box and is connected to the product fixture;

[0009] The electric control element module is arranged in the electric control element area; the shells of the sealed box body and the sub-sealed box both include a metal layer, a composite plate layer, a damping material layer and a sound-absorbing material layer arranged in sequence from the outside to the inside, and the metal layer, the composite plate layer and the damping material layer are all provided with a sound-absorbing structure.

[0010] Furthermore, the thicknesses of the sealing material layer, the metal layer, the composite plate layer and the damping material layer are 2 mm, 4 mm and 50 mm respectively.

[0011] Furthermore: the surface of the metal layer is provided with sound-absorbing embossing with irregular concave-convex structure at micron level, nano-scale hollow microbeads are added to the composite plate layer, a cavity resonance structure is provided in the damping material layer, and the density of the sound-absorbing material layer gradually increases from the outside to the inside.

[0012] Furthermore: the silencing structure includes a plurality of conical silencing cavities distributed in an array, the conical silencing cavities are staggered in arrangement positions in the metal layer, the composite plate layer and the damping material layer, and the conical silencing cavities in two adjacent layers of material are staggered in thickness direction.

[0013] Furthermore: the conical silencer cavity comprises a cavity body and a wedge-shaped silencer protrusion arranged on the inner wall of the cavity body.

[0014] Furthermore: it also includes a heat dissipation system, which includes a heat dissipation duct, a silent fan and a temperature sensor; the heat dissipation duct is arranged in the electronic control component area; the silent fan is arranged at the air outlet and air inlet ends of the heat dissipation duct, and the temperature sensor is arranged in the electronic control component area.

[0015] Furthermore: the heat dissipation air duct is an n-shaped bending structure, and the inner wall of the air outlet end is also provided with a plurality of staggered guide plates.

[0016] Furthermore: shock-absorbing pads are provided below the air outlet and the air inlet, and the shock-absorbing pads are made of rubber material.

[0017] Furthermore: it also includes a noise collection system, the noise collection system includes at least three test microphones, and the test microphones are evenly arranged along the circumference of the product fixture.

[0018] Furthermore: the noise collection system also includes a data processor, which is electrically connected to the test microphones respectively; the sound pickup surface of the test microphone is arranged parallel to the test surface of the earphone shell to be tested fixed by the product fixture.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention forms multiple sound insulation barriers by adopting a multi-layer composite structure of a metal layer, a composite plate layer, a damping material layer and a sound-absorbing material layer in the main sealed box and the sub-sealed box, and arranging a sound-absorbing structure on each layer of material, thereby significantly improving the overall sound insulation effect of the equipment. Among them, the micron-level sound-absorbing embossing on the metal layer can effectively disperse the sound wave energy, the nano-level hollow microbeads in the composite plate layer enhance the sound insulation performance in the mid-frequency band, the cavity resonance structure of the damping material layer specifically absorbs low-frequency noise, and the sound-absorbing material layer with a density gradient design can reduce sound wave reflection, so that the entire sound insulation system still has a good sound insulation effect in the low-frequency band below 100Hz.

[0021] Second, the present invention uses a sub-sealed box to seal the motor drive module separately, and forms a labyrinthine sound path through the staggered arrangement of the conical silencer cavity, thereby extending the sound wave propagation path. At the same time, the wedge-shaped silencer protrusions on the inner wall of the conical silencer cavity further increase the contact area between the sound wave and the sound-absorbing material, effectively reducing the impact of the noise generated during the operation of the motor on the test results, and ensuring the accuracy of the test data.

[0022] 3. The heat dissipation system of the present invention adopts an n-shaped bending air duct structure, which is matched with the staggered arrangement of guide plates to form an acoustic maze while ensuring the heat dissipation effect, thereby blocking the propagation of noise. Shock-absorbing pads are set at the air inlet and outlet ends of the silent fan to effectively suppress the vibration transmission when the fan is running, so that the equipment can still maintain a stable low-noise working environment during long-term operation.

[0023] 4. The present invention can accurately collect noise data from all directions of the earphone shell by evenly arranging at least three test microphones around the product fixture and setting the microphone pickup surface parallel to the surface to be tested, thereby improving the comprehensiveness and reliability of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is an isometric schematic diagram of an earphone shell noise testing device of the present invention;

[0025] Figure 2 A schematic diagram of the material hierarchy of the main sealing box and the sub-sealing box;

[0026] Figure 3 It is a schematic diagram of the structure of the conical silencer cavity;

[0027] Figure 4 It is a schematic diagram of a front view of an earphone shell noise testing device of the present invention;

[0028] Figure 5 for Figure 4 Sectional view in the AA direction;

[0029] In the figure:

[0030] 1. Operating table; 1.1. Main sealing box; 1.2. Sub-sealing box; 1.3. Metal layer; 1.4. Composite board layer; 1.5. Damping material layer; 1.6. Sound-absorbing material layer; 1.7. Cavity body; 1.8. Wedge-shaped sound-absorbing protrusion; 2. Product fixture; 3. Motor drive module; 4. Electronic control component module; 5.1. Air outlet; 5.2. Air inlet; 6. Silent fan. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0033] like Figure 1 As shown, the present invention provides an earphone shell noise testing device, including an operating table 1, a product fixture 2, a plurality of motor drive modules 3 and an electric control component module 4; the operating table 1 includes a main sealed box 1.1, a product fixing area arranged above the main sealed box 1.1, an electric control component area arranged in the main sealed box 1.1 and a plurality of sub-sealed boxes 1.2 arranged in the product fixing area. Among them, a product fixture 2 and a motor drive module 3 are arranged on the product fixing area, and the motor drive module 3 is sealed by the corresponding sub-sealed box 1.2. The output shaft of the motor drive module 3 passes through the sub-sealed box 1.2 and is connected to the product fixture 2 to realize the driving of the earphone shell to be tested. The electric control component module 4 is arranged in the electric control component area in the main sealed box 1.1 for controlling the entire test process.

[0034] The main sealing box 1.1 and the sub-sealing box 1.2 are both designed with a multi-layer composite structure. Figure 2As shown, from the outside to the inside, it includes a metal layer 1.3, a composite plate layer 1.4, a damping material layer 1.5 and a sound-absorbing material layer 1.6. Among them, the metal layer 1.3 is made of a 2mm thick cold-rolled steel plate, and the surface is specially processed to form irregular concave and convex sound-absorbing embossing at the micron level. This microstructure can effectively disperse the incident sound waves and reduce the directional reflection of the sound waves. The composite plate layer 1.4 is made of a 4mm thick modified high-density fiberboard, and nano-scale hollow microbeads are added to the plate. This structure can significantly improve the sound insulation effect in the mid-frequency band. The damping material layer 1.5 is made of a 50mm thick special sound insulation felt, which is designed with a cavity resonance structure inside, which can specifically absorb low-frequency noise around 100Hz. The innermost sound-absorbing material layer 1.6 adopts a density gradient design, and the density gradually increases from the outside to the inside, forming a gradient layer of acoustic impedance, which can greatly reduce the reflection of sound waves.

[0035] like Figure 3 As shown, array-distributed conical silencing cavities are arranged on the metal layer 1.3, the composite plate layer 1.4 and the damping material layer 1.5. The arrangement positions of these conical silencing cavities in each layer are staggered, and the conical silencing cavities in two adjacent layers of materials are staggered along the thickness direction. The conical silencing cavity includes a cavity body 1.7, and a wedge-shaped silencing protrusion 1.8 is arranged on the inner wall of the cavity body 1.7. This design forms a labyrinth-like sound path, which can effectively extend the propagation path of sound waves, increase the contact opportunities between sound waves and sound-absorbing materials, and thus improve the sound insulation effect.

[0036] like Figure 4-5 As shown, the present invention also includes a heat dissipation system, which is mainly composed of a heat dissipation duct, a silent fan 6 and a temperature sensor. The heat dissipation duct is arranged in the electronic control component area, adopts an n-type bending structure design, and a plurality of staggered guide plates are arranged on the inner wall of the air outlet end 5.1. This structure can not only extend the air flow path and improve the heat dissipation effect, but also form an acoustic maze to block the propagation of noise. A silent fan 6 is provided at the air outlet end 5.1 and the air inlet end 5.2 of the heat dissipation duct, and a vibration-damping pad made of rubber material is provided under the fan, which can effectively suppress the vibration generated when the fan is running. The temperature sensor is arranged in the electronic control component area for real-time monitoring of the internal temperature.

[0037] In order to accurately collect noise data, the present invention designs a noise collection system. The system includes at least three test microphones, which are evenly arranged along the circumference of the product fixture 2. The pickup surface of the microphone is arranged parallel to the test surface of the earphone shell to be tested to ensure that the collected noise data accurately reflects the noise characteristics of the earphone shell in all directions. The noise collection system also includes a data processor, which is electrically connected to each test microphone and is used to process and analyze the collected noise data.

[0038] The working process of the present invention is as follows: First, fix the earphone shell to be tested on the product fixture 2. After starting the system, the motor drive module 3 drives the product fixture 2 through the output shaft in the sub-sealed box 1.2, simulating various motion states that the earphone may encounter in actual use. During the test, the multi-layer sealing structure and the conical silencer effectively block the interference of external noise, and the sub-sealed box 1.2 isolates the noise generated by the motor drive module 3 itself. At the same time, the heat dissipation system continues to work, and through the cooperation of the n-type air duct and the guide plate, the noise generated by the heat dissipation process is minimized while ensuring the stability of the internal temperature of the equipment. The circumferentially arranged test microphones collect noise data in all directions in real time to ensure that the test results are comprehensive and reliable.

[0039] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent transformation or modification made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. An earphone shell noise testing device, characterized in that: It includes an operating table, a product fixture, several motor drive modules and electric control component modules; The operating table includes a main sealed box, a product fixing area arranged above the main sealed box, an electric control component area arranged in the main sealed box, and a plurality of sub-sealed boxes arranged in the product fixing area; the product fixture is arranged in the product fixing area; The motor drive module is arranged in the product fixing area and is sealed by the corresponding sub-sealing box, and the output shaft of the motor drive module passes through the sub-sealing box and is connected to the product fixture; The electric control element module is arranged in the electric control element area; the shells of the main sealed box and the sub-sealed box each include a metal layer, a composite plate layer, a damping material layer and a sound absorbing material layer arranged in sequence from the outside to the inside, and the metal layer, the composite plate layer and the damping material layer are each provided with a sound absorbing structure; The surface of the metal layer is provided with sound-absorbing embossing with irregular concave-convex structures at the micron level, nano-scale hollow microbeads are added to the composite plate layer, a cavity resonance structure is provided in the damping material layer, and the density of the sound-absorbing material layer gradually increases from the outside to the inside; The muffler structure comprises a plurality of conical muffler cavities distributed in an array. The conical muffler cavities are arranged in an alternating manner in the metal layer, the composite plate layer and the damping material layer. The conical muffler cavities in two adjacent layers of material are staggered in the thickness direction.

2. The headphone shell noise testing device according to claim 1, characterized in that: The thicknesses of the metal layer, composite plate layer and damping material layer are 2 mm, 4 mm and 50 mm respectively.

3. The earphone shell noise testing device according to claim 1, characterized in that: The conical silencing cavity comprises a cavity body and a wedge-shaped silencing protrusion arranged on the inner wall of the cavity body.

4. The earphone shell noise testing device according to claim 1, characterized in that: It also includes a heat dissipation system, which includes a heat dissipation duct, a silent fan and a temperature sensor; the heat dissipation duct is arranged in the electronic control component area; the silent fan is arranged at the air outlet and air inlet ends of the heat dissipation duct, and the temperature sensor is arranged in the electronic control component area.

5. The earphone shell noise testing device according to claim 4, characterized in that: The heat dissipation air duct is an n-shaped bending structure, and the inner wall of the air outlet end is also provided with a plurality of staggered guide plates.

6. The earphone shell noise testing device according to claim 4, characterized in that: Shock-absorbing pads are arranged below the air outlet and the air inlet, and the shock-absorbing pads are made of rubber material.

7. The earphone shell noise testing device according to claim 1, characterized in that: The device also includes a noise collection system, which includes at least three test microphones. The test microphones are evenly arranged along the circumference of the product fixture.

8. The earphone shell noise testing device according to claim 7, characterized in that: The noise collection system also includes a data processor, which is electrically connected to the test microphones respectively; the sound pickup surface of the test microphone is arranged parallel to the test surface of the earphone shell to be tested fixed by the product fixture.

Images