A sound insulation testing device and testing method for the front interior sound insulation pad of an automobile

Abstract

The present invention discloses a sound insulation testing device and a testing method for a front interior sound insulation pad of an automobile, including a testing bench. Four support rods are fixedly arranged at the lower end of the testing bench. A testing box is arranged above the testing bench. A mixing chamber is arranged on one side inside the testing box, and a semi-anechoic chamber is arranged on the other side inside the testing box. Chutes are arranged inside the front and rear side walls of the mixing chamber. A lead screw is arranged inside the chutes. Both sides of the lead screw are rotatably connected to the inner walls of the chutes. A connecting seat is sleeved outside the lead screw. One end of the connecting seat extends outside the chute. An installation plate is arranged between the connecting seats. A limiting groove is arranged inside the central position of the installation plate, and the limiting groove is a through structure. Two clamping plates are arranged at the upper end of the installation plate, and the clamping plates are symmetrically arranged. This structure solves the problems that it is difficult to move the position of the loudspeaker and the installation of the sound insulation pad fixing mechanism is not convenient enough.

Description

Technical Field

[0001] The present invention relates to the technical field of sound insulation testing, and specifically to a sound insulation testing device and a testing method for the front bulkhead sound insulation pad in an automobile. Background Technique

[0002] The sound insulation testing device for the front bulkhead sound insulation pad in an automobile is a special equipment for measuring the sound insulation performance of the front bulkhead sound insulation pad in an automobile. The testing device generally includes a wall enclosing a closed space, a base, a noise device, a noise meter, and a testing port. During the test, the noise device generates noise with a certain frequency and intensity to simulate the noise environment generated by a sound source such as an automobile engine. The noise is transmitted through the air to the sound insulation pad to be tested, and the sound insulation pad blocks it. The noise meter measures the noise levels before and after the sound insulation pad respectively to obtain the noise attenuation amount, and the sound insulation performance of the sound insulation pad is evaluated according to the measured noise attenuation amount. Among them, the laboratory method uses a reverberation chamber - anechoic chamber test environment, and calculates the sound insulation amount by measuring the average sound pressure signals of the microphone in the two chambers, which is suitable for accurately testing the sound insulation performance of the sound insulation pad.

[0003] For example, the Chinese patent "A Material Sound Insulation Coefficient Testing Device" with the publication number CN219285098U includes a sound generating module; a sound generating and testing module, where the sound generating and testing module includes a first polygonal pipe fitting and a first microphone assembly disposed inside the first polygonal pipe fitting. One end of the sound generating and testing module is communicated with the sound generating module to receive the sound signal emitted by the sound generating module; a sound insulation specimen module, the sound insulation specimen module is detachably connected to the end of the sound generating and testing module away from the sound generating module, and the sound insulation specimen module includes a second polygonal pipe fitting, and the second polygonal pipe fitting is provided with a material specimen to be tested; a sound insulation testing module, the sound insulation testing module is detachably connected to the end of the sound insulation specimen module away from the sound generating and testing module, and the sound insulation testing module includes a third polygonal pipe fitting and a second microphone assembly disposed inside the third polygonal pipe fitting to receive the sound signal emitted by the sound generating module after being sound-insulated by the sound insulation specimen module. The testing device further includes an acoustic absorption end module, and the acoustic absorption end module is detachably connected to the end of the sound insulation testing module away from the sound insulation specimen module.

[0004] Although the above-mentioned prior art can achieve the sound insulation test of the sound insulation pad, in actual use, on the one hand, it is difficult to move the position of the speaker. Usually, the speaker is fixedly arranged in the reverberation chamber, resulting in the need to stop the test and adjust the speaker every time the speaker is moved, thus reducing the test efficiency. On the other hand, the installation of the sound insulation pad fixing mechanism is not convenient enough. It is fixed on the partition between the two chambers through the fixing mechanism, making it difficult to install the fixing mechanism in the appropriate position during manual installation, thus easily interfering with the test results. Therefore, it does not meet the existing requirements. For this reason, we propose a sound insulation test device and its test method for the front interior sound insulation pad of an automobile. Summary of the Invention

[0005] The purpose of the present invention is to provide a sound insulation test device and its test method for the front interior sound insulation pad of an automobile, so as to solve the problems that the position of the speaker is difficult to move and the installation of the sound insulation pad fixing mechanism is not convenient enough proposed in the above background technology.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A sound insulation test device for the front interior sound insulation pad of an automobile, including a test bench. Four support rods are fixedly arranged at the lower end of the test bench. A test box is arranged above the test bench. A reverberation chamber is arranged on one side inside the test box, and an anechoic chamber is arranged on the other side inside the test box. Sliding grooves are arranged inside the front and rear end side walls of the reverberation chamber. A lead screw is arranged inside the sliding groove. Both sides of the lead screw are rotatably connected to the inner wall of the sliding groove. A connecting seat is sleeved outside the lead screw. One end of the connecting seat extends outside the sliding groove. An installation plate is arranged between the connecting seats. A limiting groove is arranged inside the center position of the installation plate. The limiting groove is a through structure. Two clamping plates are arranged at the upper end of the installation plate. The clamping plates are symmetrically arranged.

[0007] Preferably, a speaker is arranged at the upper end of the installation plate between the clamping plates. A first rubber pad is fixedly arranged on one side of the installation plate close to the speaker. The first rubber pad contacts the speaker. A second threaded rod is fixedly arranged at the lower end of the clamping plate. The second threaded rod extends below the installation plate through the limiting groove. A third nut is sleeved outside the second threaded rod at the lower end of the installation plate.

[0008] Preferably, a servo motor is fixedly arranged inside the test box on one side of the sliding groove. The output shaft of the servo motor extends inside the sliding groove and is fixedly connected to the lead screw.

[0009] Preferably, a connecting cavity is arranged inside the partition between the reverberation chamber and the anechoic chamber. The connecting cavity is a through structure. Four positioning holes are arranged inside the partition between the reverberation chamber and the anechoic chamber on the outer side of the connecting cavity. The positioning holes are through structures and are annularly and equidistantly distributed. Fixed frames are arranged on both sides of the partition between the reverberation chamber and the anechoic chamber.

[0010] Preferably, an installation cavity is arranged inside the center position of the fixed frame. The installation cavity is a through structure. A sound insulation pad is fixedly arranged inside the installation cavity. Four fixing holes are arranged inside the fixed frame on the outer side of the installation cavity. The fixing holes correspond to the positioning holes in position, and the fixing holes are through structures. A first threaded rod is arranged inside the positioning hole. Both sides of the first threaded rod extend to the outside of the fixed frame through the fixing holes. Second nuts are sleeved on the outer sides of both sides of the first threaded rod. The second nuts are in contact with the fixed frame.

[0011] Preferably, a second sound insulation cotton is fixedly arranged on one side of the fixed frame close to the partition board. The second sound insulation cotton is arranged on the outer side of the opening of the connection cavity.

[0012] Preferably, two support seats are fixedly arranged on both sides of the lower end of the test box. The support seats are symmetrically distributed. A damper is fixedly arranged at the lower end of the support seat. The lower end of the damper is fixedly connected to the test bench. A support spring is fixedly arranged between the fixed end and the telescopic end of the damper.

[0013] Preferably, a third threaded rod is fixedly arranged at the upper end of the support seat. First sound insulation cotton is arranged at the upper ends of the test box at the openings outside the mixing chamber and the semi-anechoic chamber. A cover plate is arranged at the upper end of the first sound insulation cotton. An extrusion plate is sleeved on the outer side of the third threaded rod above the cover plate. The lower end of the extrusion plate is in contact with the cover plate. A first nut is sleeved on the outer side of the third threaded rod above the extrusion plate.

[0014] Preferably, a base is arranged inside the semi-anechoic chamber. A noise meter is fixedly arranged at the upper end of the base. The noise meter corresponds to the connection cavity. Second rubber pads are fixedly arranged at the four corner positions of the lower end of the base. The lower ends of the second rubber pads are in contact with the semi-anechoic chamber.

[0015] A test method for a sound insulation test device for an automotive inner front panel sound insulation pad includes the following steps:

[0016] Step 1: Before the test, first install the fixed frame. At this time, first align the first threaded rod with the opening of the positioning hole and insert it into the positioning hole until the first threaded rod penetrates through the positioning hole. Then align the fixing hole on one fixed frame with one end of the first threaded rod, move the fixed frame until the first threaded rod penetrates through the fixing hole on the fixed frame. At this time, use the second nut to preliminarily fix the fixed frame on the first threaded rod. Then align the fixing hole on the other fixed frame with the other end of the first threaded rod, move the fixed frame until the first threaded rod penetrates through the fixing hole on the fixed frame, and then use the second nut to fix the other fixed frame on the first threaded rod. At this time, rotate the second nut so that the two fixed frames move towards each other, and at the same time, the second sound insulation cotton on the fixed frame squeezes the partition board.

[0017] Step 2: Before testing, first rotate the third nut so that the third nut moves downward on the second threaded rod through the thread until the third nut disengages from the mounting plate. At this time, the operator pulls the clamping plate to move on the mounting plate, and at the same time, the second threaded rod moves in the limiting groove until the clamping plate is moved to a suitable position. At this time, place the speaker on the upper end of the mounting plate. Then move the clamping plate again so that the first rubber pad on the clamping plate squeezes the outer wall of the speaker. At this time, rotate the third nut so that the third nut moves upward on the second threaded rod until the third nut contacts the lower end of the mounting plate;

[0018] Step 3: Before testing, place the cover plate on the upper end of the test box. The test box squeezes the first sound insulation cotton. Then sleeve the pressing plate on the outside of the third threaded rod until the lower end of the pressing plate contacts the cover plate. At this time, rotate the first nut so that the first nut moves downward on the outside of the third threaded rod through the thread. Through the first nut, the pressing plate squeezes the cover plate to complete the fixation of the cover plate. During the test, the noise emitted by the speaker will generate a certain vibration. At this time, the vibration is transmitted to the test box. The vibration on the test box will squeeze the damper and the support spring. After being squeezed, the damper and the support spring will deform. The vibration on the test box is absorbed through the deformation of the damper and the support spring until the test ends. At this time, the damper and the support spring are reset;

[0019] Step 4: During the test, when the position of the speaker needs to be adjusted, synchronously start the two servo motors at this time, so that the output shafts of the servo motors drive the lead screws to rotate. The lead screws drive the connecting seats to move in the sliding grooves, and at the same time, the mounting plates fixedly connected to the connecting seats move together until the speaker fixed on the mounting plate is moved to a suitable position. Then conduct the sound insulation test.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] (1) The present invention can move the speaker through the clamping plate and the servo motor. First, rotate the third nut so that the third nut moves downward on the second threaded rod through the thread until the third nut disengages from the mounting plate. At this time, the operator pulls the clamping plate to move on the mounting plate, and at the same time, the second threaded rod moves in the limiting groove until the clamping plate is moved to a suitable position. Then, place the speaker on the upper end of the mounting plate. At this time, move the clamping plate again so that the first rubber pad on the clamping plate squeezes the outer wall of the speaker. Then, rotate the third nut so that the third nut moves upward on the second threaded rod until the third nut contacts the lower end of the mounting plate. When the position of the speaker needs to be adjusted, at this time, synchronously start the two servo motors so that the output shafts of the servo motors drive the lead screws to rotate, and the connecting seat is driven to move in the chute through the lead screws. At the same time, the mounting plate fixedly connected to the connecting seat moves together until the speaker fixed on the mounting plate is moved to a suitable position. Then, conduct the sound insulation test, thereby improving the flexibility of the speaker movement and at the same time improving the adaptability of the clamping structure.

[0022] (2) The present invention can quickly position the fixed frame through the first threaded rod and the positioning holes. When installing the fixed frame, first align the first threaded rod with the opening of the positioning hole and insert it into the positioning hole until the first threaded rod penetrates the positioning hole. Then, align the fixing hole on one fixed frame with one end of the first threaded rod and move the fixed frame until the first threaded rod penetrates the fixing hole on the fixed frame. At this time, use the second nut to preliminarily fix the fixed frame on the first threaded rod. Then, align the fixing hole on the other fixed frame with the other end of the first threaded rod and move the fixed frame until the first threaded rod penetrates the fixing hole on the fixed frame. Then, use the second nut to fix the other fixed frame on the first threaded rod. At this time, rotate the second nut so that the two fixed frames move towards each other, and at the same time, the second sound insulation cotton on the fixed frame squeezes the partition board, thereby improving the installation efficiency of the fixed frame.

[0023] (3) The present invention can reduce the interference of external factors on the test results through the first sound insulation cotton and the damper. Place the cover plate on the upper end of the test box, and the test box squeezes the first sound insulation cotton. At this time, sleeved the pressing plate on the outside of the third threaded rod until the lower end of the pressing plate contacts the cover plate. Then, rotate the first nut so that the first nut moves downward on the outside of the third threaded rod through the thread, and the pressing plate squeezes the cover plate through the first nut to complete the fixation of the cover plate. During the test, the noise emitted by the speaker will generate a certain vibration. At this time, the vibration is transmitted to the test box, and the vibration on the test box will squeeze the damper and the support spring. After being squeezed, the damper and the support spring will deform, and the vibration on the test box is absorbed through the deformation of the damper and the support spring until the test ends. At this time, the damper and the support spring are reset, thereby improving the stability of the test results. Description of the Drawings

[0024] Figure 1 is a perspective view of the external structure of the present invention;

[0025] Figure 2 is a perspective view of the internal structure of the present invention;

[0026] Figure 3 is a front view of the internal structure of the present invention;

[0027] Figure 4 is a side view of the internal structure of the mixing chamber of the present invention;

[0028] Figure 5 is a side view of the positioning structure of the present invention.

[0029] In the figure: 1, test bench; 2, support rod; 3, test box; 4, cover plate; 5, support seat; 6, damper; 7, support spring; 8, extrusion plate; 9, first nut; 10, mixing chamber; 11, semi-anechoic chamber; 12, first sound insulation cotton; 13, chute; 14, lead screw; 15, connecting seat; 16, mounting plate; 17, limiting groove; 18, speaker; 19, clamping plate; 20, first rubber pad; 21, fixing frame; 22, mounting cavity; 23, sound insulation pad; 24, first threaded rod; 25, second nut; 26, noise meter; 27, servo motor; 28, second threaded rod; 29, third nut; 30, connecting cavity; 31, positioning hole; 32, fixing hole; 33, base; 34, second rubber pad; 35, third threaded rod; 36, second sound insulation cotton. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0031] Please refer to Figures 1-5 , an embodiment provided by the present invention: a sound insulation test device for an automotive inner front panel sound insulation pad, including a test bench 1, four support rods 2 are fixedly arranged at the lower end of the test bench 1, a test box 3 is arranged above the test bench 1, a mixing chamber 10 is arranged on one side inside the test box 3, a semi-anechoic chamber 11 is arranged on the other side inside the test box 3, a base 33 is arranged inside the semi-anechoic chamber 11, a noise meter 26 is fixedly arranged at the upper end of the base 33, the noise meter 26 corresponds to the position of the connecting cavity 30, and second rubber pads 34 are fixedly arranged at the four corner positions of the lower end of the base 33, and the lower ends of the second rubber pads 34 are in contact with the semi-anechoic chamber 11.

[0032] Please refer to Figure 1 , Figure 3 and Figure 4, chutes 13 are provided inside the front and rear side walls of the mixing chamber 10. A lead screw 14 is provided inside the chute 13. Both sides of the lead screw 14 are rotatably connected to the inner wall of the chute 13. A connecting seat 15 is sleeved outside the lead screw 14. One end of the connecting seat 15 extends outside the chute 13. An installation plate 16 is provided between the connecting seats 15. A limiting groove 17 is provided inside the central position of the installation plate 16. The limiting groove 17 is a through structure. Two clamping plates 19 are provided at the upper end of the installation plate 16. The clamping plates 19 are symmetrically arranged. A servo motor 27 is fixedly provided inside the mixing chamber 10 on one side of the chute 13. The output shaft of the servo motor 27 extends into the chute 13 and is fixedly connected to the lead screw 14, facilitating the rotation of the lead screw 14 driven by the servo motor 27.

[0033] Please refer to Figure 3 and Figure 4 , a speaker 18 is provided at the upper end of the installation plate 16 between the clamping plates 19. A first rubber pad 20 is fixedly provided on one side of the installation plate 16 close to the speaker 18. The first rubber pad 20 contacts the speaker 18. A second threaded rod 28 is fixedly provided at the lower end of the clamping plate 19. The second threaded rod 28 extends below the installation plate 16 through the limiting groove 17. A third nut 29 is sleeved outside the lower end of the installation plate 16 of the second threaded rod 28, facilitating the clamping and fixing of the speaker 18 by the clamping plate 19.

[0034] Please refer to Figure 2 and Figure 3 , a connecting cavity 30 is provided inside the partition between the mixing chamber 10 and the semi-anechoic chamber 11. The connecting cavity 30 is a through structure. Four positioning holes 31 are provided inside the partition between the mixing chamber 10 and the semi-anechoic chamber 11 on the outside of the connecting cavity 30. The positioning holes 31 are through structures and are annularly and equidistantly distributed. Fixed frames 21 are provided on both sides of the partition between the mixing chamber 10 and the semi-anechoic chamber 11. An installation cavity 22 is provided inside the central position of the fixed frame 21. The installation cavity 22 is a through structure. A sound insulation pad 23 is fixedly provided inside the installation cavity 22. Four fixing holes 32 are provided inside the fixed frame 21 on the outside of the installation cavity 22. The fixing holes 32 correspond to the positions of the positioning holes 31 and are through structures. A first threaded rod 24 is provided inside the positioning hole 31. Both sides of the first threaded rod 24 extend outside the fixed frame 21 through the fixing holes 32. Second nuts 25 are sleeved outside both sides of the first threaded rod 24. The second nuts 25 contact the fixed frame 21. A second sound insulation cotton 36 is fixedly provided on one side of the fixed frame 21 close to the partition. The second sound insulation cotton 36 is provided on the outside of the opening of the connecting cavity 30, facilitating the rapid positioning of the fixed frame 21 through the positioning hole 31 and the first threaded rod 24.

[0035] Please refer to Figure 1 and Figure 2, on both sides of the lower end of the test chamber 3, two support seats 5 are fixedly arranged. The support seats 5 are symmetrically distributed. At the lower end of the support seat 5, a damper 6 is fixedly arranged. The lower end of the damper 6 is fixedly connected to the test bench 1. Between the fixed end and the telescopic end of the damper 6, a support spring 7 is fixedly arranged. At the upper end of the support seat 5, a third threaded rod 35 is fixedly arranged. At the upper end of the test chamber 3 located outside the openings of the mixing chamber 10 and the semi-anechoic chamber 11, a first sound insulation cotton 12 is arranged. At the upper end of the first sound insulation cotton 12, a cover plate 4 is arranged. Outside the upper part of the cover plate 4 where the third threaded rod 35 is located, a pressing plate 8 is sleeved. The lower end of the pressing plate 8 is in contact with the cover plate 4. Outside the upper part of the pressing plate 8 where the third threaded rod 35 is located, a first nut 9 is sleeved, which is convenient to improve the sound insulation performance of the test chamber 3 through the first sound insulation cotton 12.

[0036] A test method for a sound insulation test device for an automotive inner front panel sound insulation pad includes the following steps:

[0037] Step 1: Before the test, first install the fixed frame 21. At this time, align the first threaded rod 24 with the opening of the positioning hole 31 and insert it into the positioning hole 31 until the first threaded rod 24 penetrates through the positioning hole 31. Then align the fixing hole 32 on one fixed frame 21 with one end of the first threaded rod 24, move the fixed frame 21 until the first threaded rod 24 penetrates through the fixing hole 32 on the fixed frame 21. At this time, use the second nut 25 to initially fix the fixed frame 21 on the first threaded rod 24. Then align the fixing hole 32 on the other fixed frame 21 with the other end of the first threaded rod 24, move the fixed frame 21 until the first threaded rod 24 penetrates through the fixing hole 32 on the fixed frame 21, and then use the second nut 25 to fix the other fixed frame 21 on the first threaded rod 24. At this time, rotate the second nut 25 so that the two fixed frames 21 move towards each other, and at the same time, the second sound insulation cotton 36 on the fixed frame 21 squeezes the partition board;

[0038] Step 2: Before the test, first rotate the third nut 29 so that the third nut 29 moves downward on the second threaded rod 28 through the thread until the third nut 29 disengages from the mounting plate 16. At this time, an operator pulls the clamping plate 19 to move on the mounting plate 16, and at the same time, the second threaded rod 28 moves in the limiting groove 17 until the clamping plate 19 is moved to a suitable position. At this time, place the speaker 18 on the upper end of the mounting plate 16. Then move the clamping plate 19 again so that the first rubber pad 20 on the clamping plate 19 squeezes the outer wall of the speaker 18. At this time, rotate the third nut 29 so that the third nut 29 moves upward on the second threaded rod 28 until the third nut 29 contacts the lower end of the mounting plate 16;

[0039] Step 3: Before testing; place the cover plate 4 on the upper end of the test chamber 3. The test chamber 3 squeezes the first sound insulation cotton 12. At this time, sleeve the extrusion plate 8 on the outside of the third threaded rod 35 until the lower end of the extrusion plate 8 contacts the cover plate 4. Then rotate the first nut 9 so that the first nut 9 moves downward on the outside of the third threaded rod 35 through the thread. The extrusion plate 8 squeezes the cover plate 4 through the first nut 9 to complete the fixation of the cover plate 4. During the test, the noise emitted by the speaker 18 will generate a certain vibration. At this time, the vibration is transmitted to the test chamber 3. The vibration on the test chamber 3 squeezes the damper 6 and the support spring 7. After being squeezed, the damper 6 and the support spring 7 will deform. The vibration on the test chamber 3 is absorbed through the deformation of the damper 6 and the support spring 7 until the test ends. At this time, the damper 6 and the support spring 7 are reset;

[0040] Step 4: During the test, when it is necessary to adjust the position of the speaker 18, synchronously start the two servo motors 27 at this time, so that the output shafts of the servo motors 27 drive the lead screws 14 to rotate. The lead screws 14 drive the connecting seats 15 to move in the sliding grooves 13. At the same time, the mounting plates 16 fixedly connected to the connecting seats 15 move together until the speaker 18 fixed on the mounting plate 16 is moved to a suitable position. Then the sound insulation test is carried out.

[0041] Working principle: When in use, first align the first threaded rod 24 with the opening of the positioning hole 31 and insert it into the positioning hole 31 until the first threaded rod 24 penetrates through the positioning hole 31. Then align the fixing hole 32 on one fixing frame 21 with one end of the first threaded rod 24, and move the fixing frame 21 until the first threaded rod 24 penetrates through the fixing hole 32 on the fixing frame 21. At this time, use the second nut 25 to preliminarily fix the fixing frame 21 on the first threaded rod 24. Then align the fixing hole 32 on the other fixing frame 21 with the other end of the first threaded rod 24, and move the fixing frame 21 until the first threaded rod 24 penetrates through the fixing hole 32 on the fixing frame 21. Then use the second nut 25 to fix the other fixing frame 21 on the first threaded rod 24. At this time, rotate the second nut 25 so that the two fixing frames 21 move towards each other. At the same time, the second sound insulation cotton 36 on the fixing frame 21 squeezes the partition board. Then rotate the third nut 29 so that the third nut 29 moves downward on the second threaded rod 28 through the thread until the third nut 29 disengages from the mounting plate 16. At this time, the operator pulls the clamping plate 19 to move on the mounting plate 16, and at the same time, the second threaded rod 28 moves in the limiting groove 17 until the clamping plate 19 is moved to a suitable position. Then place the loudspeaker 18 on the upper end of the mounting plate 16. At this time, move the clamping plate 19 again so that the first rubber pad 20 on the clamping plate 19 squeezes the outer wall of the loudspeaker 18. At this time, rotate the third nut 29 so that the third nut 29 moves upward on the second threaded rod 28 until the third nut 29 contacts the lower end of the mounting plate 16. Place the cover plate 4 on the upper end of the test box 3, and the test box 3 squeezes the first sound insulation cotton 12. Then sleeve the pressing plate 8 on the outside of the third threaded rod 35 until the lower end of the pressing plate 8 contacts the cover plate 4. At this time, rotate the first nut 9 so that the first nut 9 moves downward on the outside of the third threaded rod 35 through the thread, and the pressing plate 8 squeezes the cover plate 4 through the first nut 9 to complete the fixing of the cover plate 4. During the test, the noise emitted by the loudspeaker 18 will generate certain vibrations. At this time, the vibrations are transmitted to the test box 3. The vibrations on the test box 3 will squeeze the damper 6 and the support spring 7. After being squeezed, the damper 6 and the support spring 7 will deform. The vibrations on the test box 3 are absorbed through the deformation of the damper 6 and the support spring 7 until the test ends. At this time, the damper 6 and the support spring 7 are reset. When it is necessary to adjust the position of the loudspeaker 18, at this time, simultaneously turn on the two servo motors 27 so that the output shafts of the servo motors 27 drive the lead screws 14 to rotate. The lead screws 14 drive the connecting seats 15 to move in the sliding grooves 13, and at the same time, the mounting plate 16 fixedly connected to the connecting seats 15 moves together until the loudspeaker 18 fixed on the mounting plate 16 is moved to a suitable position. Then perform the sound insulation test.

[0042] It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A sound insulation test device for a car interior front wall sound insulation pad, comprising a test bench (1), characterized in that: Four support rods (2) are fixedly arranged at the lower end of the test bench (1); a test box (3) is arranged above the test bench (1); a mixing chamber (10) is arranged on one side of the test box (3); a semi-anechoic chamber (11) is arranged on the other side of the test box (3); slide grooves (13) are arranged inside the front and rear end side walls of the mixing chamber (10); a screw rod (14) is arranged inside the slide groove (13); both sides of the screw rod (14) are rotatably connected to the inner wall of the slide groove (13); a connecting seat (15) is sleeved on the outside of the screw rod (14); one end of the connecting seat (15) extends to the outside of the slide groove (13); a mounting plate (16) is arranged between the connecting seats (15); a limiting groove (17) is arranged inside the center of the mounting plate (16); the limiting groove (17) is a through-type structure; two clamping plates (19) are arranged on the upper end of the mounting plate (16); the clamping plates (19) are symmetrically arranged; A loudspeaker (18) is disposed at the upper end of the mounting plate (16) located between the clamping plates (19); a first rubber pad (20) is fixedly disposed on a side of the mounting plate (16) close to the loudspeaker (18); the first rubber pad (20) is in contact with the loudspeaker (18); a second threaded rod (28) is fixedly disposed at the lower end of the clamping plate (19); the second threaded rod (28) extends to the bottom of the mounting plate (16) through the limiting groove (17); a third nut (29) is sleeved on the outer portion of the second threaded rod (28) located at the lower end of the mounting plate (16); A servo motor (27) is fixedly arranged inside the test box (3) at one side of the slide groove (13); an output shaft of the servo motor (27) extends into the slide groove (13) and is fixedly connected to the lead screw (14); A connecting cavity (30) is provided inside the partition between the mixing chamber (10) and the semi-anechoic chamber (11), and the connecting cavity (30) is a through-type structure. Four positioning holes (31) are provided inside the partition between the mixing chamber (10) and the semi-anechoic chamber (11) outside the connecting cavity (30), and the positioning holes (31) are a through-type structure, and the positioning holes (31) are distributed in an annular manner with equal spacing. Fixed frames (21) are provided on both sides of the partition between the mixing chamber (10) and the semi-anechoic chamber (11); An installation cavity (22) is provided inside the center of the fixing frame (21), the installation cavity (22) is a through-type structure, a sound insulation pad (23) is fixedly provided inside the installation cavity (22), four fixing holes (32) are provided inside the fixing frame (21) outside the installation cavity (22), the fixing holes (32) correspond to the positions of the positioning holes (31), and the fixing holes (32) are a through-type structure, a first threaded rod (24) is provided inside the positioning hole (31), both sides of the first threaded rod (24) extend to the outside of the fixing frame (21) through the fixing holes (32), and second nuts (25) are sleeved on the outside of both sides of the first threaded rod (24), and the second nuts (25) are in contact with the fixing frame (21).

2. A sound insulation testing device for a car interior front wall sound insulation pad according to claim 1, characterized in that: A second sound insulation cotton (36) is fixedly arranged on one side of the fixing frame (21) close to the partition, and the second sound insulation cotton (36) is arranged outside the opening of the connecting cavity (30).

3. A sound insulation test device for a car interior front wall sound insulation pad according to claim 1, characterized in that: Two support seats (5) are fixedly arranged on both sides of the lower end of the test box (3), and the support seats (5) are symmetrically distributed. A damper (6) is fixedly arranged at the lower end of the support seat (5), and the lower end of the damper (6) is fixedly connected to the test bench (1). A support spring (7) is fixedly arranged between the fixed end and the telescopic end of the damper (6).

4. A sound insulation testing device for a car inner front wall sound insulation pad according to claim 3, characterized in that: A third threaded rod (35) is fixedly provided at the upper end of the support seat (5); a first sound insulation cotton (12) is provided at the upper end of the test box (3) located outside the openings of the mixing chamber (10) and the semi-anechoic chamber (11); a cover plate (4) is provided at the upper end of the first sound insulation cotton (12); an extrusion plate (8) is sleeved on the outer portion of the third threaded rod (35) located above the cover plate (4); the lower end of the extrusion plate (8) is in contact with the cover plate (4); and a first nut (9) is sleeved on the outer portion of the third threaded rod (35) located above the extrusion plate (8).

5. A sound insulation testing device for a car interior front wall sound insulation pad according to claim 4, characterized in that: A base (33) is provided inside the semi-anechoic chamber (11), a noise meter (26) is fixedly provided at the upper end of the base (33), the position of the noise meter (26) corresponds to the position of the connecting chamber (30), and second rubber pads (34) are fixedly provided at the four corners of the lower end of the base (33), the lower end of the second rubber pad (34) is in contact with the semi-anechoic chamber (11).

6. A test method for a sound insulation test device for a car's inner front wall sound insulation pad, implemented based on the sound insulation test device for a car's inner front wall sound insulation pad according to claim 5, characterized in that: The steps include: Step 1: Before testing, the fixing frame (21) is installed. At this time, the first threaded rod (24) is aligned with the opening of the positioning hole (31) and inserted into the positioning hole (31) until the first threaded rod (24) passes through the positioning hole (31). Then, the fixing hole (32) on a fixing frame (21) is aligned with one end of the first threaded rod (24), and the fixing frame (21) is moved until the first threaded rod (24) passes through the fixing hole (32) on the fixing frame (21). At this time, the fixing frame (21) is initially fixed using the second nut (25). On the first threaded rod (24), align the fixing hole (32) on the other fixing frame (21) with the other end of the first threaded rod (24), move the fixing frame (21) until the first threaded rod (24) passes through the fixing hole (32) on the fixing frame (21), and then use the second nut (25) to fix the other fixing frame (21) on the first threaded rod (24). At this time, rotate the second nut (25) so that the fixing frames (21) on both sides move toward each other, and at the same time, the second sound insulation cotton (36) on the fixing frame (21) squeezes the partition; Step 2: Before testing, first rotate the third nut (29) so that the third nut (29) moves downward on the second threaded rod (28) through the thread until the third nut (29) is disengaged from the mounting plate (16). At this time, the operator pulls the clamping plate (19) to move on the mounting plate (16), and at the same time, the second threaded rod (28) moves in the limiting groove (17) until the clamping plate (19) is moved to a suitable position. At this time, the speaker (18) is placed on the upper end of the mounting plate (16). At this time, the clamping plate (19) is moved again so that the first rubber pad (20) on the clamping plate (19) squeezes the outer wall of the speaker (18). At this time, the third nut (29) is rotated so that the third nut (29) moves upward on the second threaded rod (28) until the third nut (29) contacts the lower end of the mounting plate (16); Step 3: Before testing, place the cover plate (4) on the upper end of the test box (3), and the test box (3) squeezes the first sound insulation cotton (12). Then, sleeve the squeezing plate (8) onto the outside of the third threaded rod (35) until the lower end of the squeezing plate (8) contacts the cover plate (4). Then, rotate the first nut (9) so that the first nut (9) moves downward on the outside of the third threaded rod (35) through the thread, and the squeezing plate (8) squeezes the cover plate (4) through the first nut (9). The plate (4) is fixed. During the test, the noise emitted by the speaker (18) generates a certain vibration. At this time, the vibration is transmitted to the test box (3). The vibration on the test box (3) causes compression of the damper (6) and the support spring (7). After being compressed, the damper (6) and the support spring (7) are deformed. The vibration on the test box (3) is absorbed by the deformation of the damper (6) and the support spring (7) until the test is completed. At this time, the damper (6) and the support spring (7) are reset; Step 4: During the test, when the position of the speaker (18) needs to be adjusted, the two servo motors (27) are simultaneously turned on, so that the output shaft of the servo motor (27) drives the screw rod (14) to rotate, and the screw rod (14) drives the connecting seat (15) to move in the slide groove (13), and at the same time, the mounting plate (16) fixedly connected to the connecting seat (15) moves together, until the speaker (18) fixed on the mounting plate (16) is moved to a suitable position, and then the sound insulation test is performed.

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