Standing wave tube test auxiliary device

Abstract

The utility model discloses an auxiliary device for testing a standing wave tube in the technical field of acoustic testing equipment, which comprises a testing tube, a filling box is arranged on the outer side of the testing tube, a motor is arranged at the lower end of the testing tube, a transmission part is arranged at the output end of the motor, a telescopic rod is arranged on the transmission part, and the telescopic rod is connected with the testing tube. A clamping plate is fixedly connected to the output end of the telescopic rod, an adjusting rod is arranged on the clamping plate, a stretching assembly is arranged on the clamping plate, and the adjusting rod is connected with the stretching assembly. The high precision of bevel gear meshing and thread transmission is utilized to ensure the position precision of a sample to be detected so as to form a closed loop positioning chain, meanwhile, the rigid transmission of the bevel gear can inhibit the vibration transmission of the motor, the self-locking of the thread can ensure that the sample does not deviate after being positioned, and through the modularized standing wave tube, the positioning precision of the sample to be detected is greatly improved. And screws with different leads can be quickly replaced, so that sample testing requirements are diversified.

Description

Technical Field

[0001] This utility model relates to the field of acoustic testing equipment technology, and in particular to an auxiliary device for testing standing wave tubes. Background Technology

[0002] In acoustic research, a standing wave tube (SWT) is an acoustic measurement device based on the principle of acoustic wave interference. It is primarily used to determine the sound absorption coefficient of sound insulation materials. Its working principle involves generating a stable standing wave field within a closed tube. The sound pressure distribution characteristics formed by the reflection of sound waves at the material surface and the superposition of the incident wave are used to evaluate the material's sound absorption performance. During testing, the sample of the material to be tested is installed at one end of the SWT, and a single-frequency sound wave is emitted from the other end by a loudspeaker. The sound wave propagates inside the tube and is reflected at the sample surface, interfering with the incident wave to form a standing wave with fixed nodes and antinodes. By measuring the maximum and minimum sound pressure values ​​using a moving probe microphone or a fixed array sensor, and combining this with the theoretical relationship between the sound pressure ratio and the sound absorption coefficient, the sound absorption coefficient of the material at a specific frequency can be calculated.

[0003] However, existing technologies have some problems: when conducting sound absorption tests, in order to detect more coefficients of the test sample, it is necessary to place the test sample inside the standing wave tube and adjust the fixed position of the sample. Since the standing wave tube is mostly an integral structure, when the sample detection position is inside the standing wave tube, the difficulty of fixing the sample position and positioning the sample increases greatly, reducing the detection efficiency, and the airtightness between the sample and the tube cannot be guaranteed, which makes it difficult to guarantee the detection accuracy. Therefore, we propose a standing wave tube testing auxiliary device. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an auxiliary device for testing standing wave tubes. By setting a threaded telescopic rod to adjust the position of the sample clamp, the positioning accuracy of the sample is ensured. Furthermore, by using multiple adjustable baffles, the gap between the sample and the inner wall of the tube is sealed, thereby ensuring the accuracy of the test.

[0005] The purpose of this utility model is achieved as follows: A standing wave tube testing auxiliary device includes a test tube, a filling box is provided on the outside of the test tube, a motor is provided at the lower end of the test tube, a transmission component is provided at the output end of the motor, a telescopic rod is provided on the transmission component, a clamp is fixedly connected to the output end of the telescopic rod, the telescopic rod is used to adjust the position of the clamp inside the test tube, an adjusting rod is provided on the clamp, an extension component is provided on the clamp, the adjusting rod is connected to the extension component, and the extension component is used to fill the gap between the clamp and the test tube.

[0006] Optionally, one end of the test tube is bolted to an input tube, and the other end of the test tube is bolted to an output tube. The output tube is provided with a flared opening, and a support frame is provided at the lower end of the test tube. A sealing ring is provided between the test tube and the output tube, and the output tubes are provided correspondingly.

[0007] Optionally, the transmission component includes a drive shaft and a connecting shaft, a driven shaft is provided between the drive shaft and the connecting shaft, the connecting shaft is driven by bevel gears with the drive shaft and the connecting shaft respectively, and the connecting shaft meshes with the telescopic rod for transmission.

[0008] Optionally, the clamping plate is provided with a fixing plate, the fixing plate is provided with a guide rod, the guide rod is inserted into the clamping plate, and the fixing plate is threadedly connected with a screw, which is rotatably connected to the clamping plate.

[0009] Optionally, the extension assembly includes a fixed baffle, which is fixedly connected to a clamping plate. The fixed baffle has a guide groove, and a side baffle is slidably connected to the guide groove. A top plate is provided on the side baffle, and an adjusting block is fixedly connected to the side baffle. A sliding groove is provided on the top plate, and an inclined surface is provided in the sliding groove. The sliding groove and the adjusting block are correspondingly provided. Both the side baffle and the top plate have T-slots. A T-block is fixedly connected to the clamping plate, and the T-block is slidably connected to the T-slot.

[0010] Optionally, the side baffle is provided with a mounting groove, a worm gear is rotatably connected in the mounting groove, a worm wheel is fitted on the worm gear, and the worm wheel is fixedly connected to the screw.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] 1. By setting up a motor, transmission components, and telescopic rod, the motor output is converted into direction via a bevel gear set, and then the rotational motion is converted into linear displacement of the telescopic rod via a thread. The high precision of bevel gear meshing and thread transmission is used to ensure the positional accuracy of the sample under test, forming a closed-loop positioning chain. At the same time, the rigid transmission of the bevel gear can suppress the transmission of motor vibration, while the self-locking of the thread can ensure that the sample does not shift after positioning. Furthermore, through the modular standing wave tube, screws with different leads can be quickly replaced to meet diverse sample testing needs.

[0013] 2. By setting the worm gear and screw to work together, the clamping and sealing are executed synchronously. The screw's thread transmission is converted into the radial expansion of the extension component, so that each baffle can extend outward evenly and fit against the inner wall of the test tube. The flexible material baffle can avoid overpressure damage and can also compensate for unevenness of the inner wall surface or tolerance of the tube wall through elastic deformation, ensuring acoustic sealing. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure provided by this utility model.

[0016] Figure 2 This is a schematic diagram of the connection structure between the test tube and the input tube provided by this utility model.

[0017] Figure 3 This is a schematic diagram of the cooperation between the transmission component and the telescopic rod provided by this utility model.

[0018] Figure 4 This is a schematic diagram of the clamping plate structure provided by this utility model.

[0019] Figure 5 This is an exploded view of the clamping plate structure provided by this utility model.

[0020] Figure 6 This utility model provides Figure 5 Enlarged view of part A.

[0021] Figure 7 This is a schematic diagram of the back structure of the clamp provided by this utility model.

[0022] In the diagram: 1. Test tube; 11. Filling box; 12. Bell mouth; 13. Support frame; 14. Input tube; 15. Output tube; 16. Sealing ring; 17. Motor; 2. Transmission component; 21. Drive shaft; 22. Driven shaft; 23. Connecting shaft; 24. Telescopic rod; 3. Clamping plate; 31. Fixing plate; 32. Guide rod; 33. Screw; 34. T-block; 4. Extension assembly; 41. Fixing baffle; 42. Side baffle; 43. Top plate; 44. Guide groove; 45. T-slot; 46. Slide groove; 47. Inclined surface; 48. Adjusting block; 5. Mounting groove; 51. Worm gear; 52. Worm. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] like Figures 1 to 7 The illustrated auxiliary device for testing a standing wave tube includes a test tube 1, a filling box 11 on the outside of the test tube 1, a motor 17 at the lower end of the test tube 1, a transmission component 2 at the output end of the motor 17, a telescopic rod 24 on the transmission component 2, a clamping plate 3 fixedly connected to the output end of the telescopic rod 24, the telescopic rod 24 being used to adjust the position of the clamping plate 3 inside the test tube 1, an adjusting rod on the clamping plate 3, and an extension component 4 on the clamping plate 3, the adjusting rod being connected to the extension component 4, the extension component 4 being used to fill the gap between the clamping plate 3 and the test tube 1.

[0025] Furthermore, the embodiments provided by this utility model are used to determine acoustic parameters such as the sound absorption coefficient of the material to be tested. First, the material to be tested is positioned inside the test tube 1, the sound source device is activated, the sound source device emits sound waves, which propagate along a rigid long tube with a uniform cross-sectional area, enter the channel of the test tube 1 through the output tube 15, and when it encounters the material sample to be tested inside the test tube 1, part of the sound waves will be reflected, and the remaining energy will be output from the horn 12 through the output tube 15 and absorbed by the energy recovery device, thereby detecting the acoustic performance parameters of the sample.

[0026] Furthermore, firstly, sound-absorbing material is injected into the outer filling box 11 to effectively isolate external noise and vibration interference, ensuring the purity of the sound field inside the test tube 1. The bottom filling box 11 needs to be equipped with a motor 17. Therefore, when setting the sound-absorbing material, a heat dissipation structure needs to be set up to ensure the normal operation of the device.

[0027] Secondly, the internal structure of the telescopic rod 24 is composed of threaded components, and the existing technology of the telescopic guide rod 32 is adopted. The combination of the transmission component 2 driven by the motor 17 and the telescopic rod 24 can improve the positional accuracy of the clamping plate 3 and achieve millimeter-level precision positioning.

[0028] Finally, the linkage between the adjusting rod and the extension assembly 4 can seal the tiny gap between the clamping plate 3 and the pipe wall, solving the measurement error caused by sound leakage at the edges in traditional clamps.

[0029] Furthermore, each baffle in the extension assembly 4 is made of rubber. Its elastic deformation characteristics can ensure sealing while avoiding excessive compression of the sample, which could lead to structural deformation and affect acoustic performance.

[0030] In addition, the adjustment of the sample position is controlled by motor 17, which reduces random errors introduced by human operation. Combined with the acoustic isolation effect of filling box 11, the accuracy of test data is greatly improved. The overall structure ensures sealing and stability while taking into account operating efficiency and maintenance convenience.

[0031] Specifically, one end of the test tube 1 is bolted to an input tube 14, and the other end of the test tube 1 is bolted to an output tube 15. The output tube 15 is provided with a flared mouth 12. The lower end of the test tube 1 is provided with a support frame 13. A sealing ring 16 is provided between the test tube 1 and the output tube 15. The output tube 15 is provided with corresponding output tubes.

[0032] Furthermore, firstly, the standing wave tube is divided into a test tube 1, an input tube 14, and an output tube 15. The modular design facilitates disassembly, maintenance, and component replacement. For example, the input / output tube 15 can be quickly replaced for different testing needs (such as adjusting the size or material of the horn 12), significantly improving the adaptability of the device.

[0033] Secondly, the segmented connection is secured by bolts and sealed with 16 sealing rings to ensure airtightness, which can effectively prevent sound energy leakage. Compared with the integral long tube, the segmented manufacturing tolerance is easier to control and the processing difficulty can be reduced.

[0034] Third, the input tube 14 can be designed with a gradually changing cross section to improve the uniformity of sound wave incidence, and the horn 12 of the output tube 15 can reduce end reflection interference, so that the test tube 1 section forms a purer standing wave field.

[0035] Specifically, the transmission component 2 includes a drive shaft 21 and a connecting shaft 23. A driven shaft 22 is provided between the drive shaft 21 and the connecting shaft 23. The connecting shaft 23 is driven by bevel gears with the drive shaft 21 and the connecting shaft 23 respectively. The connecting shaft 23 is engaged with the telescopic rod 24 for transmission.

[0036] Furthermore, the use of traditional bevel gear transmission can change the transmission direction and has high meshing accuracy, ensuring the repeatability and stability of the sample clamp 3 positioning, which is especially suitable for acoustic testing scenarios that require high-precision adjustment.

[0037] In addition, the rigid transmission characteristics of bevel gears can effectively suppress vibration transmission and avoid the impact interference generated when the motor 17 starts and stops, which affects the sound field distribution in the test tube 1.

[0038] Specifically, a fixing plate 31 is provided on the clamping plate 3, and a guide rod 32 is provided on the fixing plate 31. The guide rod 32 is inserted into the clamping plate 3, and a screw 33 is threadedly connected to the fixing plate 31. The screw 33 is rotatably connected to the clamping plate 3.

[0039] It should be noted that the screw 33 is marked with graduations at the corresponding positions of the fixing plate 31 to determine the rotation angle of the screw 33 and ensure the clamping accuracy between the fixing plate 31 and the clamping plate 3. In use, the screw 33 is turned, and the screw 33 drives the fixing plate 31 to approach the clamping plate 3 under the guidance of the guide rod 32 through the thread transmission, thereby clamping the sample.

[0040] Specifically, the extension assembly 4 includes a fixed baffle 41, which is fixedly connected to the clamping plate 3. A guide groove 44 is provided on the fixed baffle 41, and a side baffle 42 is slidably connected to the guide groove 44. A top plate 43 is provided on the side baffle 42, and an adjusting block 48 is fixedly connected to the side baffle 42. A sliding groove 46 is provided on the top plate 43, and an inclined surface 47 is provided within the sliding groove 46. The sliding groove 46 and the adjusting block 48 are correspondingly arranged.

[0041] Furthermore, the fixed baffle 41 is located at the lower end of the clamping plate 3 and is fixedly connected to the clamping plate 3, while the side baffle 42 and the top plate 43 are fitted together. When the side baffle 42 slides to both sides, the adjusting block 48 at the top of the side baffle 42 cooperates with the sliding groove 46 on the top plate 43. The inclined surface 47 in the sliding groove 46 lifts the top plate 43, so that the top plate 43 is attached to the upper wall of the test tube 1. The side plate and the fixed baffle 41 are respectively attached to the inside of the test tube 1, thereby forming a closed test environment.

[0042] Specifically, T-slots 45 are provided on both the side baffle 42 and the top plate 43, and T-blocks 34 are fixedly connected to the clamping plate 3. The T-blocks 34 and the T-slots 45 are slidably connected.

[0043] Furthermore, the high rigidity of the T-shaped structure can effectively resist lateral forces, ensuring that the clamp 3 does not shift or shake during movement.

[0044] Secondly, the opening on one side of the T-slot facilitates quick assembly and disassembly of the clamping plate 3, allowing for the replacement of test samples of different specifications or maintenance of internal components, thus significantly improving operational efficiency. In addition, the self-centering characteristic of the T-structure can automatically compensate for machining tolerances, and with the lubricating coating, it can achieve smooth sliding without the need for an additional guiding mechanism, which simplifies the structure and reduces costs.

[0045] Specifically, the side baffle 42 has an installation groove 5, and a worm gear 52 is rotatably connected in the installation groove 5. A worm wheel 51 is fitted on the worm gear 52, and the worm wheel 51 is fixedly connected to the screw 33.

[0046] Furthermore, by cooperating with the screw 33 and the worm gear 51 and worm 52, the function of the extension component 4 is simultaneously executed during the sample clamping process. The self-locking characteristics of the worm gear 51 and worm 52 can ensure the positional stability of the extension component 4 during the clamping process and avoid displacement caused by vibration or external force, which is particularly suitable for long-term precision testing.

[0047] Working principle: When in use, start the motor 17. The motor 17 drives the output end of the telescopic rod 24 through the transmission component 2 to extend the clamping plate 3. Place the sample to be tested between the clamping plate 3 and the fixed plate 31. Rotate the screws 33 on both sides. The screws 33 drive the fixed plate 31 to clamp the sample to be tested through the threaded transmission. Simultaneously drive the worm gear 51 to rotate, thereby driving the worm 52 to rotate, pushing the side baffle 42 to extend to both sides, and simultaneously driving the top plate 43 to rise. After tightening the screws 33, start the motor 17 to retract the telescopic rod 24 and determine the position of the sample to be tested.

[0048] The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A standing wave tube testing auxiliary device, comprising a test tube (1), characterized in that: A filling box (11) is provided on the outside of the test tube (1). A motor (17) is provided at the lower end of the test tube (1). A transmission component (2) is provided at the output end of the motor (17). A telescopic rod (24) is provided on the transmission component (2). A clamping plate (3) is fixedly connected to the output end of the telescopic rod (24). The telescopic rod (24) is used to adjust the position of the clamping plate (3) inside the test tube (1). An adjusting rod is provided on the clamping plate (3). An extension component (4) is provided on the clamping plate (3). The adjusting rod is connected to the extension component (4). The extension component (4) is used to fill the gap between the clamping plate (3) and the test tube (1).

2. The standing wave tube testing auxiliary device according to claim 1, characterized in that: One end of the test tube (1) is bolted to an input tube (14), and the other end of the test tube (1) is bolted to an output tube (15). The output tube (15) is provided with a flared mouth (12). The lower end of the test tube (1) is provided with a support frame (13). A sealing ring (16) is provided between the test tube (1) and the output tube (15). The output tube (15) is provided in correspondence with the output tube (15).

3. The standing wave tube testing auxiliary device according to claim 1, characterized in that: The transmission component (2) includes a drive shaft (21) and a connecting shaft (23). A driven shaft (22) is provided between the drive shaft (21) and the connecting shaft (23). The connecting shaft (23) is driven by bevel gears with the drive shaft (21) and the connecting shaft (23) respectively. The connecting shaft (23) meshes with the telescopic rod (24) for transmission.

4. The standing wave tube testing auxiliary device according to claim 1, characterized in that: A fixing plate (31) is provided on the clamping plate (3), and a guide rod (32) is provided on the fixing plate (31). The guide rod (32) is inserted into the clamping plate (3), and a screw (33) is threadedly connected to the fixing plate (31). The screw (33) is rotatably connected to the clamping plate (3).

5. The standing wave tube testing auxiliary device according to claim 1, characterized in that: The extension assembly (4) includes a fixed baffle (41), which is fixedly connected to the clamping plate (3). A guide groove (44) is provided on the fixed baffle (41), and a side baffle (42) is slidably connected to the guide groove (44). A top plate (43) is provided on the side baffle (42), and an adjusting block (48) is fixedly connected to the side baffle (42). A sliding groove (46) is provided on the top plate (43), and an inclined surface (47) is provided in the sliding groove (46). The sliding groove (46) and the adjusting block (48) are correspondingly provided. T-shaped grooves (45) are provided on both the side baffle (42) and the top plate (43). A T-shaped block (34) is fixedly connected to the clamping plate (3), and the T-shaped block (34) is slidably connected to the T-shaped groove (45).

6. The standing wave tube testing auxiliary device according to claim 5, characterized in that: The side baffle (42) has an installation groove (5), and a worm gear (52) is rotatably connected in the installation groove (5). A worm wheel (51) is provided on the worm gear (52), and the worm wheel (51) is fixedly connected to the screw (33).

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