Thin plate sound absorption device applied to bogie cabin of high-speed train

Abstract

According to the technical scheme, the thin plate sound absorption device applied to the bogie cabin of the high-speed train is characterized in that the thin plate sound absorption device comprises a mounting frame, a main sound absorption thin plate is arranged in the mounting frame, an auxiliary sound absorption thin plate is arranged on the other side of the main sound absorption thin plate, and a cavity is defined by the main sound absorption thin plate and the auxiliary sound absorption thin plate; an adjusting plate is arranged in the auxiliary sound absorption thin plate; by arranging the cavity, when aerodynamic noise in a bogie area is introduced, air columns in the cavity resonate with noise sound waves, sound energy is dissipated through perforated structures of the main sound absorption thin plate and the auxiliary sound absorption thin plate, the adjusting plate is arranged in the auxiliary sound absorption thin plate, and when the adjusting plate is close to the main sound absorption thin plate, the effective volume of the cavity is reduced; the resonant frequency shifts to high frequency; and when the adjusting plate is far away from the main sound absorption thin plate, the effective volume of the cavity is increased, and the resonant frequency deviates to low frequency, so as to adapt to the frequency spectrum change of aerodynamic noise at different train speeds.

Description

Technical Field

[0001] This invention relates to the field of high-speed train vehicle equipment technology, specifically to a thin-plate sound-absorbing device applied to the bogie cabin of a high-speed train. Background Technology

[0002] my country's high-speed rail industry has developed rapidly and is in a leading position in the world. The further development of high-speed rail has put forward more stringent requirements for its speed improvement, comfort and environmental protection. As the train speed increases, the main noise sources include wheel-rail noise, traction system noise and aerodynamic noise. When the train speed exceeds 250 kilometers per hour, the proportion of aerodynamic noise increases exponentially with the square of the speed, and gradually replaces wheel-rail noise as the dominant noise source of the train.

[0003] The industry's control methods for aerodynamic noise in the bogie area mainly include two categories: "aerodynamic optimization" and "acoustic noise reduction". The former reduces airflow disturbance by optimizing the shape of the bogie, but it has poor adaptability to the modification of existing trains and is difficult to completely eliminate the noise generated by complex airflow. The latter directly reduces noise by installing sound-absorbing / sound-insulating devices in the bogie cabin.

[0004] Most devices use a fixed-volume resonant sound-absorbing structure, which can only effectively absorb noise at specific frequencies. However, in actual operation, changes in train speed will cause the aerodynamic noise spectrum in the bogie area to shift. The fixed structure cannot dynamically adapt to changes in noise frequency, resulting in a significant decrease in sound absorption efficiency. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a thin-plate sound-absorbing device for use in the bogie cabin of high-speed trains, solving the problems mentioned in the background art.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A thin-plate sound-absorbing device for use in a bogie cabin of a high-speed train includes: a mounting frame, wherein a main sound-absorbing thin plate is disposed inside the mounting frame, and an auxiliary sound-absorbing thin plate is disposed on the other side of the main sound-absorbing thin plate, wherein a cavity is formed between the main sound-absorbing thin plate and the auxiliary sound-absorbing thin plate, and an adjustment plate is disposed inside the auxiliary sound-absorbing thin plate; and an adjustment assembly disposed on both sides of the adjustment plate for adjusting the adjustment plate.

[0007] By adopting the above technical solution and setting up a cavity, when aerodynamic noise is introduced into the bogie area, the air column in the cavity resonates with the noise sound wave. The sound energy is dissipated through the perforated structure of the main sound-absorbing thin plate and the auxiliary sound-absorbing thin plate. The adjustment plate is set inside the auxiliary sound-absorbing thin plate, and its position in the cavity can be changed by adjusting the component to adapt to the frequency spectrum changes of aerodynamic noise at different train speeds.

[0008] Preferably, the adjustment assembly includes: a sliding groove, which is respectively opened on one side inside the main sound-absorbing thin plate and the auxiliary sound-absorbing thin plate; connecting blocks are fixedly connected to both sides of the adjustment plate; the connecting blocks are slidably sleeved with the sliding groove; a guide hole is opened on the top surface of one of the connecting blocks; a guide rod is fixedly installed on the bottom surface of the sliding groove; the guide rod is movably sleeved with the guide hole; a threaded hole is opened on the top surface of the other connecting block; a threaded rod is provided inside the sliding groove; the threaded rod is threadedly connected to the threaded hole; a mounting bracket is fixedly installed on the bottom surface of the mounting frame; a rotation hole is opened on the bottom surface of the mounting bracket; a drive motor is fixedly installed on the bottom surface of the mounting bracket; through holes are opened on the top surfaces of the mounting frame and the main sound-absorbing thin plate; a connecting column is fixedly connected to the bottom end of the threaded rod; a connecting ring is fixedly connected to the shaft of the drive motor; and the connecting ring is movably connected with the connecting column.

[0009] By adopting the above technical solution and setting a threaded rod, when the position of the adjusting plate needs to be adjusted, after starting the drive motor, the output shaft drives the connecting ring to rotate. The connecting ring, through its movable connection with the connecting column, drives the threaded rod to rotate synchronously. The threaded rod engages with the threaded hole of the connecting block, converting the rotational motion into the linear motion of the connecting block. The connecting block drives the adjusting plate to slide along the slide groove. At the same time, the movable sleeve of the guide rod and the guide hole restricts the rotation of the adjusting plate, ensuring that it moves smoothly only along the longitudinal direction of the slide groove and avoids deviation. When the adjusting plate is close to the main sound-absorbing thin plate, the effective volume of the cavity decreases and the resonant frequency shifts to higher frequencies; when the adjusting plate is far away from the main sound-absorbing thin plate, the effective volume of the cavity increases and the resonant frequency shifts to lower frequencies, thereby adapting to the spectral changes of aerodynamic noise at different train speeds.

[0010] Preferably, two limiting grooves are formed on one side of the main sound-absorbing thin plate and the auxiliary sound-absorbing thin plate, and limiting blocks are fixedly installed on both sides of the adjusting plate, with the limiting blocks slidingly sleeved together with the limiting grooves.

[0011] By adopting the above technical solution, and by setting a limiting block, when the adjusting plate slides along the slide groove, the limiting block moves synchronously in the limiting groove, forming a "double guide". Physical baffles are set at both ends of the limiting groove. When the adjusting plate moves to the limit position, the limiting block contacts the baffle, restricting the adjusting plate from continuing to move, thus avoiding excessive adjustment that could damage the cavity structure or cause the sound absorption performance to fail.

[0012] Preferably, the outer circular wall of the connecting column is provided with a movable hole, and two limiting heads are provided inside the movable hole. A limiting column is fixedly connected to one side of the limiting head, and a spring is provided between the two limiting heads. The outer circular wall of the connecting ring is provided with a fixing hole, and the limiting column is movably engaged with the fixing hole.

[0013] By adopting the above technical solution, and by setting a connecting column, two limiting heads in the movable hole of the connecting column are elastically supported by springs. The limiting column can move laterally along the movable hole with the limiting heads. When the connecting ring and the connecting column are assembled, the connecting ring squeezes the limiting column, causing the limiting column to retract into the movable hole and compress the spring. When the fixing hole of the connecting ring is aligned with the limiting column, the spring resets and pushes the limiting column into the fixing hole, realizing the quick snap-fit ​​and fixation of the connecting ring and the connecting column. When the drive motor is damaged and cannot rotate, the staff can press the limiting column to separate the connecting column from the connecting ring, and then manually rotate the connecting column to drive the threaded rod to rotate, indirectly realizing the position adjustment of the adjustment plate. This ensures that the cavity volume can still adapt to the current train noise frequency and avoids the complete failure of the sound absorption function due to motor failure.

[0014] Preferably, a rotating head is fixedly sleeved on the outside of the connecting column.

[0015] By adopting the above technical solution and by setting up a rotating head, workers can extend their arms through the maintenance port in the bogie cabin and then apply force through the rotating head to easily rotate the connecting column.

[0016] Preferably, the mounting frame is provided with a dustproof frame inside, and the dustproof frame is provided with a dustproof net inside.

[0017] By adopting the above technical solution and setting up a dustproof net, when dust and oil in the bogie cabin flow with the airflow, the dustproof net blocks impurities through physical filtration, preventing them from clogging the perforated structure and ensuring that the sound energy transmission and dissipation function of the perforation does not fail.

[0018] Preferably, two connecting brackets are fixedly installed on one side of the dustproof frame, and two connecting holes are opened on one side of the mounting frame. Connecting bolts are provided inside the connecting brackets, and the connecting bolts are threadedly connected to the connecting holes.

[0019] By adopting the above technical solution, a connecting frame is set up to fit the side of the mounting frame. The connecting bolts pass through the connecting frame and are threaded into the connecting holes of the mounting frame. The dustproof frame is fixed in the mounting frame by the pre-tightening force of the bolts. If the dustproof frame needs to be disassembled, it can be separated simply by unscrewing the connecting bolts. This facilitates the regular maintenance of the dustproof frame and the dustproof net, while ensuring that the dustproof frame does not loosen in a vibration environment and avoids filter failure due to displacement of the dustproof frame.

[0020] Preferably, two splicing frames are fixedly installed on both sides of the mounting frame.

[0021] By adopting the above technical solution, and by setting up splicing frames, the splicing frames of two adjacent mounting frames are connected by bolts or clips, so that multiple sets of sound-absorbing devices form an integral module, which can adapt to the spatial differences of bogie cabins of different models. At the same time, the rigidity of the overall structure is improved, and the ability to resist vibration is enhanced.

[0022] In summary, the present invention has the following main beneficial effects: By setting a threaded rod, when the position of the adjusting plate needs to be adjusted, after starting the drive motor, the output shaft drives the connecting ring to rotate. The connecting ring, through its movable connection with the connecting column, drives the threaded rod to rotate synchronously. The threaded rod engages with the threaded hole of the connecting block, converting the rotational motion into the linear motion of the connecting block. The connecting block then drives the adjusting plate to slide along the slide groove. At the same time, the movable sleeve of the guide rod and guide hole restricts the rotation of the adjusting plate, ensuring that it moves smoothly only along the longitudinal direction of the slide groove and avoiding deviation. When the adjusting plate is close to the main sound-absorbing thin plate, the effective volume of the cavity decreases, and the resonant frequency shifts to higher frequencies; when the adjusting plate is far away from the main sound-absorbing thin plate, the effective volume of the cavity increases, and the resonant frequency shifts to lower frequencies, thus adapting to the spectral changes of aerodynamic noise at different train speeds.

[0023] By setting a connecting post, two limit heads within the movable hole of the connecting post are elastically supported by springs. The limit post can move laterally along the movable hole with the limit heads. When the connecting ring and the connecting post are assembled, the connecting ring squeezes the limit post, causing the limit post to retract into the movable hole and compress the spring. When the fixing hole of the connecting ring is aligned with the limit post, the spring resets and pushes the limit post into the fixing hole, realizing the quick snap-fit ​​and fixation of the connecting ring and the connecting post. When the drive motor is damaged and cannot rotate, the operator can press the limit post to disengage the connecting post from the connecting ring, and then manually rotate the connecting post to drive the threaded rod to rotate, indirectly realizing the position adjustment of the adjustment plate. This ensures that the cavity volume can still adapt to the current train noise frequency and avoids the complete failure of the sound absorption function due to motor failure. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the disassembled structure of the main sound-absorbing thin plate of the present invention; Figure 3 This is a schematic diagram of the adjusting plate structure of the present invention; Figure 4 yes Figure 3 Enlarged schematic diagram of a local structure at point A; Figure 5 This is a schematic diagram of the mounting bracket structure of the present invention; Figure 6 This is a cross-sectional structural diagram of the connecting column of the present invention.

[0025] Reference numerals: 1. Mounting frame; 2. Main sound-absorbing sheet; 3. Auxiliary sound-absorbing sheet; 4. Cavity; 5. Adjusting plate; 6. Slide groove; 7. Connecting block; 8. Guide hole; 9. Guide rod; 10. Threaded rod; 11. Threaded hole; 12. Rotating hole; 13. Mounting bracket; 14. Drive motor; 15. Through hole; 16. Connecting column; 17. Rotating head; 18. Connecting ring; 19. Spring; 20. Limiting head; 21. Limiting column; 22. Fixing hole; 23. Dustproof frame; 24. Dustproof net; 25. Connecting bracket; 26. Connecting hole; 27. Connecting bolt; 28. Limiting groove; 29. ​​Limiting block; 30. Splicing frame; 31. Movable hole. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] refer to Figures 1-6 A thin-plate sound-absorbing device for use in the bogie compartment of a high-speed train includes: a mounting frame 1, a main sound-absorbing thin plate 2 disposed inside the mounting frame 1, an auxiliary sound-absorbing thin plate 3 disposed on the other side of the main sound-absorbing thin plate 2, a cavity 4 formed between the main sound-absorbing thin plate 2 and the auxiliary sound-absorbing thin plate 3, and an adjustment plate 5 disposed inside the auxiliary sound-absorbing thin plate 3; and an adjustment assembly disposed on both sides of the adjustment plate 5 for adjusting the adjustment plate 5. By setting up cavity 4, when aerodynamic noise is introduced into the bogie area, the air column in cavity 4 resonates with the noise sound wave. The sound energy is dissipated through the perforated structure of the main sound-absorbing thin plate 2 and the auxiliary sound-absorbing thin plate 3. The adjustment plate 5 is set inside the auxiliary sound-absorbing thin plate 3. Its position in cavity 4 can be changed by adjusting the component to adapt to the frequency spectrum changes of aerodynamic noise at different train speeds.

[0028] As a further embodiment of the present invention, the adjustment assembly includes: a slide 6, which is respectively opened on one side inside the main sound-absorbing thin plate 2 and the auxiliary sound-absorbing thin plate 3; connecting blocks 7 are fixedly connected to both sides of the adjustment plate 5; the connecting blocks 7 are slidably sleeved together with the slide 6; a guide hole 8 is opened on the top surface of one of the connecting blocks 7; a guide rod 9 is fixedly installed on the bottom surface inside the slide 6; the guide rod 9 is movably sleeved together with the guide hole 8; a threaded hole 11 is opened on the top surface of the other connecting block 7; a threaded rod 10 is provided inside the slide 6; the threaded rod 10 is threadedly connected to the threaded hole 11; a mounting frame 13 is fixedly installed on the bottom surface of the mounting frame 1; a rotating hole 12 is opened on the bottom surface of the mounting frame 13; a drive motor 14 is fixedly installed on the bottom surface of the mounting frame 13; a through hole 15 is opened on the top surface of the mounting frame 1 and the main sound-absorbing thin plate 2; a connecting post 16 is fixedly connected to the bottom end of the threaded rod 10; a connecting ring 18 is fixedly connected to the shaft of the drive motor 14; and the connecting ring 18 is movably connected to the connecting post 16. By setting the threaded rod 10, when the position of the adjusting plate 5 needs to be adjusted, after starting the drive motor 14, the output shaft drives the connecting ring 18 to rotate. The connecting ring 18 is movably connected to the connecting column 16, driving the threaded rod 10 to rotate synchronously. The threaded rod 10 is threadedly engaged with the threaded hole 11 of the connecting block 7, and the rotational motion is converted into the linear motion of the connecting block 7. The connecting block 7 drives the adjusting plate 5 to slide along the slide groove 6. At the same time, the guide rod 9 is movably sleeved with the guide hole 8, restricting the rotation of the adjusting plate 5 and ensuring that it only moves smoothly along the longitudinal direction of the slide groove 6 to avoid deviation. When the adjusting plate 5 is close to the main sound-absorbing thin plate 2, the effective volume of the cavity 4 decreases and the resonance frequency shifts to a higher frequency. When the adjusting plate 5 is far away from the main sound-absorbing thin plate 2, the effective volume of the cavity 4 increases and the resonance frequency shifts to a lower frequency, thereby adapting to the frequency spectrum changes of aerodynamic noise at different train speeds.

[0029] As a further embodiment of the present invention, two limiting grooves 28 are provided on one side of the main sound-absorbing thin plate 2 and the auxiliary sound-absorbing thin plate 3, and limiting blocks 29 are fixedly installed on both sides of the adjusting plate 5, and the limiting blocks 29 are slidably sleeved together with the limiting grooves 28. By setting a limiting block 29, when the adjusting plate 5 slides along the slide groove 6, the limiting block 29 moves synchronously in the limiting groove 28, forming a "double guide". Physical baffles are set at both ends of the limiting groove 28. When the adjusting plate 5 moves to the limit position, the limiting block 29 contacts the baffles, restricting the adjusting plate 5 from continuing to move, thus avoiding excessive adjustment that could damage the cavity 4 structure or cause the sound absorption performance to fail.

[0030] As a further embodiment of the present invention, the outer circular wall of the connecting post 16 is provided with a movable hole 31, and two limiting heads 20 are provided inside the movable hole 31. The limiting post 21 is fixedly connected to one side of the limiting head 20, and a spring 19 is provided between the two limiting heads 20. The outer circular wall of the connecting ring 18 is provided with a fixing hole 22, and the limiting post 21 is movably engaged with the fixing hole 22. By setting a connecting post 16, two limiting heads 20 are elastically supported by springs 19 within the movable hole 31 of the connecting post 16. The limiting post 21 can move laterally along the movable hole 31 with the limiting head 20. When the connecting ring 18 is assembled with the connecting post 16, the connecting ring 18 squeezes the limiting post 21, causing the limiting post 21 to retract into the movable hole 31 and compress the spring 19. When the fixing hole 22 of the connecting ring 18 is aligned with the limiting post 21, the spring 19 resets and pushes the limiting post 21 into the fixing hole 22, realizing the quick snap-fit ​​and fixation of the connecting ring 18 and the connecting post 16. When the drive motor 14 is damaged and cannot rotate, the operator can press the limiting post 21 to separate the connecting post 16 from the connecting ring 18, and then manually rotate the connecting post 16 to drive the threaded rod 10 to rotate, indirectly realizing the position adjustment of the adjusting plate 5, ensuring that the volume of the cavity 4 can still adapt to the current train noise frequency, and avoiding the complete failure of the sound absorption function due to motor failure.

[0031] As a further embodiment of the present invention, a rotating head 17 is fixedly sleeved on the outside of the connecting column 16; By setting up the rotating head 17, workers can extend their arms through the maintenance port in the bogie cabin and then apply force through the rotating head 17 to easily rotate the connecting column 16.

[0032] As a further embodiment of the present invention, a dustproof frame 23 is provided inside the mounting frame 1, and a dustproof net 24 is provided inside the dustproof frame 23; By setting up a dustproof net 24, when dust and oil in the bogie compartment flow with the airflow, the dustproof net 24 blocks impurities through physical filtration, preventing them from clogging the perforated structure and ensuring that the sound energy transmission and dissipation function of the perforation does not fail.

[0033] As a further embodiment of the present invention, two connecting brackets 25 are fixedly installed on one side of the dustproof frame 23, and two connecting holes 26 are opened on one side of the mounting frame 1. Connecting bolts 27 are provided inside the connecting brackets 25, and the connecting bolts 27 are threadedly connected to the connecting holes 26. By setting a connecting bracket 25, which fits against the side of the mounting frame 1, and connecting bolts 27 passing through the connecting bracket 25 and threadedly engaging with the connecting hole 26 of the mounting frame 1, the dustproof frame 23 is fixed inside the mounting frame 1 by the pre-tightening force of the bolts. If the dustproof frame 23 needs to be disassembled, it can be separated simply by unscrewing the connecting bolts 27, which facilitates the regular maintenance of the dustproof frame 23 and the dustproof mesh 24, while ensuring that the dustproof frame 23 does not loosen in a vibration environment and avoids filter failure due to displacement of the dustproof frame 23.

[0034] As a further embodiment of the present invention, two splicing frames 30 are fixedly installed on both sides of the mounting frame 1; By setting up splicing frame 30, the splicing frame 30 of two adjacent mounting frames 1 are connected by bolts or clips, so that multiple sets of sound-absorbing devices form an integral module, which can adapt to the spatial differences of bogie cabins of different models. At the same time, the rigidity of the overall structure is improved and the ability to resist vibration is enhanced.

[0035] Working principle: Please refer to Figures 1-6 As shown, when the train is running, based on the real-time speed or noise sensor data of the train control system, the drive motor 14 on the mounting bracket 13 is started. Its output shaft drives the connecting ring 18 to rotate. With the elastic engagement of the connecting ring 18 and the connecting column 16 (the limiting column 21 is engaged in the fixing hole 22), the connecting column 16 and the top threaded rod 10 are driven to rotate in the through hole 15. The threaded rod 10 cooperates with the threaded holes 11 of the connecting blocks 7 on both sides of the adjusting plate 5 to convert the rotational motion into the linear motion of the connecting block 7. At the same time, the guide hole 8 of the connecting block 7 slides along the guide rod 9 to ensure that the adjusting plate 5 only moves longitudinally along the slide groove 6. When the adjusting plate 5 is close to the main sound-absorbing thin plate 2, the volume of the cavity 4 decreases and the resonant frequency shifts to a higher frequency. When it is far away, the volume increases and the frequency shifts to a lower frequency. The limiting block 29 of the adjusting plate 5 slides along the limiting groove 28, which not only prevents the deviation but also avoids excessive adjustment through the groove end baffle.

[0036] If the drive motor 14 malfunctions, staff can press the limiting post 21 of the connecting post 16 through the maintenance port to disengage the compression spring 19 from the fixing hole 22. Then, the connecting post 16 can be manually rotated via the rotating head 17 outside the connecting post 16, causing the threaded rod 10 to rotate and complete the adjustment, ensuring uninterrupted sound absorption. For the dusty and oily environment of the bogie cabin, the dustproof frame 23 and dustproof net 24 inside the mounting frame 1 can filter impurities and prevent clogging of the perforations. The dustproof frame 23 is fixed to the connecting hole 26 of the mounting frame 1 via the connecting bracket 25 and connecting bolts 27, facilitating disassembly and maintenance. Furthermore, the splicing brackets 30 on both sides of the mounting frame 1 can splice multiple devices into a single module using bolts or clips, avoiding structural fatigue and sound leakage through gaps, comprehensively meeting the comfort, reliability, and adaptability requirements of high-speed rail noise control.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A thin-plate sound-absorbing device applied to the bogie compartment of a high-speed train, characterized in that, include: The mounting frame (1) has a main sound-absorbing thin plate (2) inside and an auxiliary sound-absorbing thin plate (3) on the other side of the main sound-absorbing thin plate (2). The main sound-absorbing thin plate (2) and the auxiliary sound-absorbing thin plate (3) enclose a cavity (4). The auxiliary sound-absorbing thin plate (3) has an adjustment plate (5) inside. Adjustment components are disposed on both sides of the adjustment plate (5) for adjusting the adjustment plate (5).

2. The thin-plate sound-absorbing device for use in a high-speed train bogie cabin according to claim 1, characterized in that, The adjustment component includes: The slide (6) is respectively opened on one side inside the main sound-absorbing thin plate (2) and the auxiliary sound-absorbing thin plate (3). The two sides of the adjusting plate (5) are fixedly connected to the connecting blocks (7). The connecting blocks (7) are slidably sleeved together with the slide (6). One of the connecting blocks (7) has a guide hole (8) on its top surface. The bottom surface of the slide (6) is fixedly installed with a guide rod (9). The guide rod (9) is movably sleeved together with the guide hole (8). The top surface of the other connecting block (7) has a threaded hole (11). The slide (6) is provided with a threaded rod (10) inside. The threaded rod (10) is threadedly connected to the threaded hole (11). The mounting frame (13) is fixedly mounted on the bottom surface of the mounting frame (1). The mounting frame (13) has a rotating hole (12) on its bottom surface. The mounting frame (13) has a drive motor (14) fixedly mounted on its bottom surface. The mounting frame (1) and the main sound-absorbing thin plate (2) have through holes (15) on their top surfaces. The bottom end of the threaded rod (10) is fixedly connected to a connecting column (16). The shaft of the drive motor (14) is fixedly connected to a connecting ring (18). The connecting ring (18) is movably connected to the connecting column (16).

3. The thin-plate sound-absorbing device for use in a high-speed train bogie cabin according to claim 2, characterized in that, Two limiting grooves (28) are opened on one side of the main sound-absorbing thin plate (2) and the auxiliary sound-absorbing thin plate (3). Limiting blocks (29) are fixedly installed on both sides of the adjusting plate (5). The limiting blocks (29) and the limiting grooves (28) are slidably sleeved together.

4. A thin-plate sound-absorbing device for use in a high-speed train bogie cabin according to claim 2, characterized in that, The outer circular wall of the connecting column (16) is provided with a movable hole (31), and two limiting heads (20) are provided inside the movable hole (31). A limiting column (21) is fixedly connected to one side of the limiting head (20), and a spring (19) is provided between the two limiting heads (20). The outer circular wall of the connecting ring (18) is provided with a fixing hole (22), and the limiting column (21) is movably engaged with the fixing hole (22).

5. A thin-plate sound-absorbing device for use in a high-speed train bogie cabin according to claim 4, characterized in that, The connecting column (16) is externally fixed with a rotating head (17).

6. A thin-plate sound-absorbing device for use in a high-speed train bogie cabin according to claim 1, characterized in that, The mounting frame (1) is provided with a dustproof frame (23), and the dustproof frame (23) is provided with a dustproof net (24).

7. A thin-plate sound-absorbing device for use in a high-speed train bogie cabin according to claim 6, characterized in that, Two connecting brackets (25) are fixedly installed on one side of the dustproof frame (23). Two connecting holes (26) are opened on one side of the mounting frame (1). Connecting bolts (27) are provided inside the connecting brackets (25). The connecting bolts (27) are threaded together with the connecting holes (26).

8. A thin-plate sound-absorbing device for use in a high-speed train bogie cabin according to claim 1, characterized in that, Two splicing frames (30) are fixedly installed on both sides of the mounting frame (1).

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