Sound insulation testing device for automobile inner front wall sound insulation pad and testing method of sound insulation testing device

Abstract

The invention discloses a sound insulation testing device for an automobile inner front wall sound insulation pad and a testing method thereof.The sound insulation testing device comprises a testing table, four supporting rods are fixedly arranged at the lower end of the testing table, a testing box is arranged above the testing table, and a sound mixing chamber is arranged on one side of the interior of the testing box; a semi-anechoic chamber is arranged on the other side in the test box, sliding grooves are formed in the side walls of the front end and the rear end of the sound mixing chamber, lead screws are arranged in the sliding grooves, the two sides of the lead screws are rotationally connected with the inner walls of the sliding grooves, the lead screws are sleeved with connecting bases, one ends of the connecting bases extend to the outer portions of the sliding grooves, and the other ends of the connecting bases extend to the outer portions of the sliding grooves. A mounting plate is arranged between the connecting seats, a limiting groove is formed in the center of the mounting plate and is of a penetrating structure, two clamping plates are arranged at the upper end of the mounting plate and are symmetrically arranged, and the problem that the position of a loudspeaker is difficult to move is solved through the structure; and a sound insulation pad fixing mechanism is not convenient enough to install.

Description

Technical Field

[0001] The invention relates to the technical field of sound insulation testing, in particular to a sound insulation testing device for a car inner front wall sound insulation pad and a testing method thereof. Background Art

[0002] The sound insulation test device for the front sound insulation pad of the car is a special equipment used to measure the sound insulation performance of the front sound insulation pad of the car. The test device usually consists of a wall, a base, a noise device, a noise meter, and a test port that enclose a closed space. During the test, the noise device generates noise of a certain frequency and intensity to simulate the noise environment generated by sound sources such as car engines. 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 level before and after the sound insulation pad to obtain the noise attenuation. According to the measured noise attenuation, the sound insulation performance of the sound insulation pad is evaluated. Among them, the laboratory method uses the reverberation chamber-semi-anechoic chamber test environment to calculate the sound insulation by measuring the average sound pressure signal of the microphone in the two chambers. It is suitable for accurate sound insulation performance testing of sound insulation pads.

[0003] For example, the Chinese patent "A Material Sound Insulation Coefficient Testing Device" with announcement number CN219285098U includes a sound-generating module; a sound-generating test module, the sound-generating test module includes a first polygonal pipe and a first microphone assembly disposed in the first polygonal pipe, one end of the sound-generating test module is connected to the sound-generating module to receive the sound signal emitted by the sound-generating module; a sound insulation test module, the sound insulation test module is detachably connected to the end of the sound-generating test module away from the sound-generating module, the sound insulation test module includes a second polygonal pipe, the second polygonal pipe is equipped with a material test piece to be tested; a sound insulation test module, the sound insulation test module is detachably connected to the end of the sound insulation test module away from the sound-generating test module, the sound insulation test module includes a third polygonal pipe and a second microphone assembly disposed in the third polygonal pipe to receive the sound signal emitted by the sound-generating module after being sound-insulated by the sound insulation test module, and the testing device also includes a sound absorption terminal module, the sound absorption terminal module is detachably connected to the end of the sound insulation test module away from the sound insulation test module.

[0004] Although the above-mentioned prior art can realize the sound insulation test of the sound insulation pad, in actual use, on the one hand, the position of the speaker is difficult to move. Usually the speaker is fixed in the reverberation chamber, which means that each time the speaker is moved, the test needs to be stopped and the speaker needs to be adjusted, thereby reducing the test efficiency. On the other hand, the sound insulation pad fixing mechanism is not convenient to install. It is fixed on the partition between the two chambers through the fixing mechanism, which makes it difficult to install the fixing mechanism in the appropriate position during manual installation, which can easily interfere with the test results. Therefore, it does not meet the existing needs. In this regard, we propose a sound insulation test device and a test method for a car interior front sound insulation pad. Summary of the invention

[0005] The object of the present invention is to provide a sound insulation testing device and a testing method for a car interior front wall sound insulation pad, so as to solve the problems that the position of the speaker proposed in the above background technology is difficult to move and the sound insulation pad fixing mechanism is not convenient to install.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a sound insulation test device for a front wall sound insulation pad of an automobile, comprising 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 mixing chamber is arranged on one side of the interior of the test box, a semi-anechoic chamber is arranged on the other side of the interior of the test box, slide grooves are arranged inside the front and rear end side walls of the mixing chamber, a screw rod is arranged inside the slide groove, both sides of the screw rod are rotatably connected to the inner wall of the slide groove, a connecting seat is sleeved on the outside of the screw rod, one end of the connecting seat extends to the outside of the slide groove, a mounting plate is arranged between the connecting seats, a limiting groove is arranged inside the center position of the mounting plate, the limiting groove is a through structure, and two clamping plates are arranged on the upper end of the mounting plate, and the clamping plates are symmetrically arranged.

[0007] Preferably, a speaker is provided at the upper end of the mounting plate between the clamping plates, a first rubber pad is fixedly provided on a side of the mounting plate close to the speaker, the first rubber pad is in contact with the speaker, a second threaded rod is fixedly provided at the lower end of the clamping plate, the second threaded rod extends to the bottom of the mounting plate through a limiting groove, and a third nut is provided on the outside of the second threaded rod located at the lower end of the mounting plate.

[0008] Preferably, a servo motor is fixedly disposed inside the test box at one side of the slide slot, and the output shaft of the servo motor extends into the slide slot and is fixedly connected to the lead screw.

[0009] Preferably, a connecting cavity is provided inside the partition between the mixing chamber and the semi-anechoic chamber, and the connecting cavity is a through-type structure. Four positioning holes are provided inside the partition between the mixing chamber and the semi-anechoic chamber, which are located outside the connecting cavity. The positioning holes are a through-type structure, and the positioning holes are equidistantly distributed in a ring shape. Fixed frames are provided on both sides of the partition between the mixing chamber and the semi-anechoic chamber.

[0010] Preferably, an installation cavity is provided inside the center position of the fixed frame, and the installation cavity is a through-type structure. A sound insulation pad is fixedly provided inside the installation cavity. Four fixing holes are provided inside the fixed frame located outside the installation cavity, and the fixing holes correspond to the positions of the positioning holes, and the fixing holes are a through-type structure. A first threaded rod is provided inside the positioning hole, and 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 outside of both sides of the first threaded rod, and the second nuts are in contact with the fixed frame.

[0011] Preferably, a second sound insulation cotton is fixedly provided on one side of the fixing frame close to the partition, and the second sound insulation cotton is arranged on the outside of the opening of the connecting cavity.

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

[0013] Preferably, a third threaded rod is fixedly provided on the upper end of the support seat, and the upper ends of the test box located outside the openings of the mixing room and the semi-anechoic chamber are provided with a first sound insulation cotton. A cover plate is provided on the upper end of the first sound insulation cotton, and an extrusion plate is provided 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, and the third threaded rod is provided with a first nut on the outer side of the upper end of the extrusion plate.

[0014] Preferably, a base is provided inside the semi-anechoic chamber, a noise meter is fixedly provided on the upper end of the base, the noise meter corresponds to the position of the connecting cavity, and second rubber pads are fixedly provided at the four corners of the lower end of the base, and the lower end of the second rubber pad is in contact with the semi-anechoic chamber.

[0015] A testing method for a sound insulation testing device for a front wall sound insulation pad of an automobile comprises the following steps: Step 1: Before testing, install the fixing frame first. At this time, align the first threaded rod with the opening of the positioning hole and insert it into the positioning hole until the first threaded rod passes through the positioning hole. Then align the fixing hole on one fixing frame with one end of the first threaded rod, move the fixing frame until the first threaded rod passes through the fixing hole on the fixing frame, and then use the second nut to preliminarily fix the fixing frame on the first threaded rod. At this time, align the fixing hole on another fixing frame with the other end of the first threaded rod, move the fixing frame until the first threaded rod passes through the fixing hole on the fixing frame, and then use the second nut to fix the other fixing frame on the first threaded rod. At this time, rotate the second nut to make the fixing frames on both sides move toward each other, and at the same time, the second sound insulation cotton on the fixing frame squeezes the partition; Step 2: Before testing, first turn the third nut to make the third nut move downward on the second threaded rod through the thread until the third nut is separated 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 limit groove until the clamping plate is moved to a suitable position. At this time, the speaker is placed on the upper end of the mounting plate. At this time, the clamping plate is moved again so that the first rubber pad on the clamping plate squeezes the outer wall of the speaker. At this time, the third nut is turned to move the third nut upward on the second threaded rod until the third nut contacts the lower end of the mounting plate. Step 3: Before the test, place the cover plate on the upper end of the test box, and the test box will squeeze the first sound insulation cotton. At this time, the extrusion plate is sleeved on the outside of the third threaded rod until the lower end of the extrusion plate contacts the cover plate. At this time, turn the first nut to move downward on the outside of the third threaded rod through the thread, and use the first nut to squeeze 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, and the vibration will be transmitted to the test box at this time. The vibration on the test box will squeeze the damper and the support spring. The damper and the support spring will deform after being squeezed, and the vibration on the test box will be absorbed by the deformation of the damper and the support spring until the test is completed. At this time, the damper and the support spring are reset; Step 4: During the test, when the position of the speaker needs to be adjusted, start the two servo motors simultaneously so that the output shaft of the servo motor drives the screw to rotate, and the screw drives the connecting seat to move in the slide groove. At the same time, the mounting plate fixed to the connecting seat moves together until the speaker fixed on the mounting plate is moved to a suitable position. At this time, the sound insulation test is performed.

[0016] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention can move the speaker through the clamping plate and the servo motor. First, the third nut is rotated to make the third nut move downward on the second threaded rod through the thread until the third nut is separated from the mounting plate. At this time, the operator pulls the clamping plate to move on the mounting plate, and the second threaded rod moves in the limit groove until the clamping plate is moved to a suitable position. At this time, the speaker is placed on the upper end of the mounting plate. At this time, the clamping plate is moved again so that the first rubber pad on the clamping plate squeezes the outer wall of the speaker. At this time, the third nut is rotated to make the third nut move 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, the two servo motors are synchronously turned on at this time, so that the output shaft of the servo motor drives the screw to rotate, and the screw drives the connecting seat to move in the slide groove, and 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. At this time, the sound insulation test is performed, thereby improving the flexibility of the speaker movement and improving the adaptability of the clamping structure.

[0017] (2) The present invention can quickly position the fixing frame through the first threaded rod and the positioning hole. When the fixing frame is installed, the first threaded rod is first aligned with the opening of the positioning hole and inserted into the positioning hole until the first threaded rod passes through the positioning hole. Then, the fixing hole on one fixing frame is aligned with one end of the first threaded rod, and the fixing frame is moved until the first threaded rod passes through the fixing hole on the fixing frame. At this time, the second nut is used to preliminarily fix the fixing frame on the first threaded rod. At this time, the fixing hole on another fixing frame is aligned with the other end of the first threaded rod. The fixing frame is moved until the first threaded rod passes through the fixing hole on the fixing frame. Then, the second nut is used to fix the other fixing frame on the first threaded rod. At this time, the second nut is rotated to make the fixing frames on both sides move toward each other. At the same time, the second sound insulation cotton on the fixing frame squeezes the partition, thereby improving the installation efficiency of the fixing frame.

[0018] (3) The present invention can reduce the interference of external factors on the test results through the first sound insulation cotton and the damper. The cover plate is placed on the upper end of the test box, and the test box squeezes the first sound insulation cotton. At this time, the squeezing plate is sleeved on the outside of the third threaded rod until the lower end of the squeezing plate contacts the cover plate. At this time, the first nut is rotated to move downward on the outside of the third threaded rod through the thread. The squeezing 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. The vibration on the test box will squeeze the damper and the support spring. The damper and the support spring will deform after being squeezed. The vibration on the test box is absorbed by the deformation of the damper and the support spring until the test is completed. At this time, the damper and the support spring are reset, thereby improving the stability of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional diagram of the external structure of the present invention; Figure 2 It is a three-dimensional diagram of the internal structure of the present invention; Figure 3 It is a front view of the internal structure of the present invention; Figure 4 It is a side view of the internal structure of the mixing chamber of the present invention; Figure 5 It is a side view of the positioning structure of the present invention.

[0020] 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. slide groove; 14. screw rod; 15. connecting seat; 16. mounting plate; 17. limit 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 DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] See also Figure 1-5 An embodiment of the present invention is a sound insulation test device for a front wall sound insulation pad of an automobile, comprising 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 of the test box 3, a semi-anechoic chamber 11 is arranged on the other side of the test box 3, a base 33 is arranged inside the semi-anechoic chamber 11, a noise meter 26 is fixedly arranged on the upper end of the base 33, the position of the noise meter 26 corresponds to the connection chamber 30, and second rubber pads 34 are fixedly arranged at the four corners of the lower end of the base 33, and the lower end of the second rubber pad 34 is in contact with the semi-anechoic chamber 11.

[0023] See also Figure 1 , Figure 3 and Figure 4 The front and rear end side walls of the mixing room 10 are both provided with a slide groove 13, and the slide groove 13 is provided with a screw rod 14. Both sides of the screw rod 14 are rotatably connected to the inner wall of the slide groove 13. The outer sleeve of the screw rod 14 is provided with a connecting seat 15, and one end of the connecting seat 15 extends to the outside of the slide groove 13. A mounting plate 16 is provided between the connecting seats 15. A limiting groove 17 is provided inside the center position of the mounting plate 16. The limiting groove 17 is a through-type structure. Two clamping plates 19 are provided on the upper end of the mounting plate 16. The clamping plates 19 are symmetrically arranged. A servo motor 27 is fixedly provided inside the test box 3 on one side of the slide groove 13. The output shaft of the servo motor 27 extends into the slide groove 13 and is fixedly connected to the screw rod 14, so that the screw rod 14 can be driven to rotate by the servo motor 27.

[0024] See also Figure 3 and Figure 4 A speaker 18 is provided at the upper end of the mounting plate 16 between the clamping plates 19, a first rubber pad 20 is fixedly provided on one side of the mounting plate 16 close to the speaker 18, the first rubber pad 20 is in contact with 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 to the bottom of the mounting plate 16 through the limiting groove 17, and a third nut 29 is provided on the outer sleeve of the second threaded rod 28 located at the lower end of the mounting plate 16, so as to facilitate clamping and fixing the speaker 18 through the clamping plate 19.

[0025] See also 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-type structure. Four positioning holes 31 are provided inside the partition between the mixing chamber 10 and the semi-anechoic chamber 11, which are located outside the connecting cavity 30. The positioning holes 31 are a through-type structure, and the positioning holes 31 are equidistantly distributed in a ring shape. A fixing frame 21 is 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 fixed inside the installation cavity 22. The fixing frame 21 is located inside the outside of the installation cavity 22. Four fixing holes 32 are provided, and the fixing holes 32 correspond to the positioning holes 31 in position, and the fixing holes 32 are a through-type structure. A first threaded rod 24 is provided inside the positioning hole 31, and both sides of the first threaded rod 24 extend to the outside of the fixing frame 21 through the fixing holes 32, and the outsides of both sides of the first threaded rod 24 are sleeved with second nuts 25, and the second nuts 25 are in contact with the fixing frame 21. A second sound insulation cotton 36 is fixedly provided on one side of the fixing frame 21 close to the partition, and the second sound insulation cotton 36 is provided on the outside of the opening of the connecting cavity 30, so as to facilitate the rapid positioning of the fixing frame 21 through the positioning holes 31 and the first threaded rod 24.

[0026] See also Figure 1 and Figure 2 Two support seats 5 are fixedly provided 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 provided 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, and a support spring 7 is fixedly provided between the fixed end and the telescopic end of the damper 6. A third threaded rod 35 is fixedly provided on the upper end of the support seat 5. The upper end of the test box 3 located outside the openings of the mixing room 10 and the semi-anechoic room 11 is provided with a first sound insulation cotton 12, and the upper end of the first sound insulation cotton 12 is provided with a cover plate 4, and the third threaded rod 35 is located above the cover plate 4. An extrusion plate 8 is provided on the outer sleeve, and the lower end of the extrusion plate 8 contacts the cover plate 4, and the third threaded rod 35 is located on the outer sleeve of the upper end of the extrusion plate 8. A first nut 9 is provided, which is convenient for improving the sound insulation performance of the test box 3 through the first sound insulation cotton 12.

[0027] A testing method for a sound insulation testing device for a front wall sound insulation pad of an automobile comprises the following steps: Step 1: Before testing, install the fixing frame 21 first. 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 passes through the positioning hole 31, and then align the fixing hole 32 on one fixing frame 21 with one 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 preliminarily fix the fixing frame 21 on the first threaded rod 24. At this time, align the fixing hole 32 on another 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 to make 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 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 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 the test; place the cover plate 4 on the upper end of the test box 3, and the test box 3 will squeeze the first sound insulation cotton 12. At this time, the squeezing plate 8 is sleeved on the outside of the third threaded rod 35 until the lower end of the squeezing plate 8 contacts the cover plate 4. At this time, turn the first nut 9 to move downward on the outside of the third threaded rod 35 through the thread, and use the first nut 9 to squeeze the cover plate 4 to complete the fixation of the cover plate 4. During the test, the noise emitted by the speaker 18 will produce a certain vibration, which is transmitted to the test box 3 at this time. The vibration on the test box 3 will squeeze the damper 6 and the support spring 7. The damper 6 and the support spring 7 will deform after being squeezed, and 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 it is necessary to adjust the position of the speaker 18, the two servo motors 27 are started synchronously, so that the output shaft of the servo motor 27 drives the screw rod 14 to rotate, and the connecting seat 15 is driven by the screw rod 14 to move in the slide groove 13, and the mounting plate 16 fixedly connected to the connecting seat 15 is moved 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.

[0028] 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 passes 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, move the fixing frame 21 until the first threaded rod 24 passes through the fixing hole 32 on the fixing frame 21, then 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 another 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, then use the second nut 25 to fix the other fixing frame 21. The fixing frame 21 is fixed on the first threaded rod 24. At this time, the second nut 25 is rotated to make the fixing frames 21 on both sides move toward each other. At the same time, the second sound insulation cotton 36 on the fixing frame 21 squeezes the partition. Then the third nut 29 is rotated to make the third nut 29 move downward on the second threaded rod 28 through the thread until the third nut 29 is separated from the mounting plate 16. At this time, the operator pulls the clamping plate 19 to move on the mounting plate 16. 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 to make the first rubber pad 20 on the clamping plate 19 press against the speaker 18. The outer wall of the test box 3 is squeezed, and the third nut 29 is rotated at this time to move the third nut 29 upward on the second threaded rod 28 until the third nut 29 contacts the lower end of the mounting plate 16, and the cover plate 4 is placed on the upper end of the test box 3. The test box 3 squeezes the first sound insulation cotton 12. At this time, the squeezing plate 8 is sleeved on the outside of the third threaded rod 35 until the lower end of the squeezing plate 8 contacts the cover plate 4. At this time, the first nut 9 is rotated to move the first nut 9 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, completing the fixation of the cover plate 4. During the test, the noise emitted by the speaker 18 will generate a certain vibration, and the vibration is transmitted to the test box 3 at this time. The vibration on the test box 3 will cause compression on the damper 6 and the support spring 7. After being squeezed, the damper 6 and the support spring 7 will be deformed, and the vibration on the test box 3 will be 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. When the position of the speaker 18 needs to be adjusted, the two servo motors 27 are synchronously started at this time, so that the output shaft of the servo motor 27 drives the screw rod 14 to rotate, and the connecting seat 15 is driven by the screw rod 14 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 carried out.

[0029] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

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.

2. A sound insulation testing device for a car interior front wall sound insulation pad according to claim 1, characterized in that: A loudspeaker (18) is arranged at the upper end of the mounting plate (16) between the clamping plates (19); a first rubber pad (20) is fixedly arranged 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 arranged 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); and 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).

3. A sound insulation testing device for a car interior front wall sound insulation pad according to claim 2, characterized in that: A servo motor (27) is fixedly disposed inside the test box (3) at one side of the slide slot (13); an output shaft of the servo motor (27) extends into the interior of the slide slot (13) and is fixedly connected to the lead screw (14).

4. A sound insulation testing device for a car interior front wall sound insulation pad according to claim 3, characterized in that: A connecting cavity (30) is arranged 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 arranged 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. The positioning holes (31) are equidistantly distributed in an annular shape. Fixed frames (21) are arranged on both sides of the partition between the mixing chamber (10) and the semi-anechoic chamber (11).

5. A sound insulation testing device for a car interior front wall sound insulation pad according to claim 4, characterized in that: 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).

6. A sound insulation testing device for a car interior front wall sound insulation pad according to claim 5, 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).

7. A sound insulation testing device for a car interior front wall sound insulation pad according to claim 6, 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).

8. The sound insulation testing device for the automobile inner front wall sound insulation pad according to claim 7, 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).

9. A sound insulation testing device for a car interior front wall sound insulation pad according to claim 8, 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).

10. A test method for a sound insulation test device for a car inner front wall sound insulation pad, implemented based on the sound insulation test device for a car inner front wall sound insulation pad according to claim 9, 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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