Directional sound field generating device for microphone core test

Abstract

The invention discloses a directional sound field generating device for microphone core testing, and relates to the technical field of microphone testing, the directional sound field generating device comprises a testing machine, the middle position of the upper surface of the testing machine is provided with a reversing assembly, and the reversing assembly is used for rotating a microphone core and adjusting the angle of the microphone core. A lubricating assembly is arranged in the middle of the reversing assembly and used for lubricating the transmission structure. According to the invention, firstly, an up-regulation cylinder is controlled to start to drive a plurality of silencing covers to be downwards clamped into a sealing groove, and a loudspeaker I can carry out microphone off-axis response testing, anti-interference capability testing and sound field symmetry calibration on a microphone core, so that the accuracy of a microphone core detection result is further improved; and then the loudspeaker 2 can carry out a directivity test on the microphone cores in the vertical direction, directional sound field detection can be conveniently carried out on different types of microphone cores through cooperative use of the loudspeaker 1 and the loudspeaker 2, and the detection equipment can be enabled to adapt to a detection environment of a plurality of microphone cores.

Description

Technical Field

[0001] The present invention relates to the technical field related to microphone testing, and specifically to a directional sound field generating device for microphone diaphragm testing. Background Art

[0002] The microphone diaphragm, an important part of the microphone structure, is an energy conversion device that converts sound signals into electrical signals. It is exactly the opposite of a speaker and is one of the two terminals of a sound device. The microphone head is the input terminal and the speaker is the output terminal. The produced microphone heads need to be tested, and only the qualified ones can be allowed to be used after the testing. The inspection of the microphone heads is relatively complex and requires continuous detection with sound waves of various frequencies. When the change in the generated current meets the standard value, it can be recognized as a qualified product.

[0003] Currently, most of the detection devices in the current stage perform detection through manual frequency modulation. During the detection process, problems such as noise have been interfering with the accuracy of experimental data. Moreover, most of the existing detection devices test the microphone diaphragms individually, with low test efficiency. And the placement angle of the diaphragm needs to be manually adjusted multiple times during the test, which leads to the detection device being turned off and on multiple times. Such excessive repeated operations will increase the detection burden on the detection device, more easily cause damage to the detection device, and at the same time, greatly reduce the user experience. Summary of the Invention

[0004] To solve the defects existing in the prior art, the present invention provides a directional sound field generating device for microphone diaphragm testing.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: A directional sound field generating device for microphone diaphragm testing according to the present invention includes a test bench. A commutation component is installed at the middle position of the upper surface of the test bench for rotating the microphone diaphragm and adjusting the angle of the diaphragm. A lubrication component is arranged at the middle position of the commutation component for lubricating the transmission structure. Fixing brackets are fixedly connected to the upper surfaces at both ends of the test bench, and a test component is fixedly installed on the upper surface of the fixing brackets for synchronously testing multiple diaphragms; The commutation component includes a support carrier. The lower end of the support carrier is fixedly connected to the upper surface of the test bench. Four sealing grooves are opened on the upper surface of the support carrier. An outer slave shaft is embedded in the middle position of the bottom surface of each sealing groove cavity through a bearing. An outer slave gear is fixedly sleeved on the lower end of each outer slave shaft. A main motor is fixedly installed at the middle position of the upper surface of the test bench, and a commutation gear meshing with the outer slave gear is fixedly connected to the upper end of the main motor.

[0006] As a preferred technical solution of the present invention, a U-shaped mounting frame is fixedly connected to the upper end of each of the outer slave shafts. A rotary cylinder is fixedly installed on the outer surface of each U-shaped mounting frame. A upper carrier is fixedly sleeved on the surface of the piston rod of each rotary cylinder. A power connection base is fixedly installed on the bottom surface of the inner cavity of each upper carrier.

[0007] As a preferred technical solution of the present invention, two positioning cylinders are fixedly installed on both side surfaces of the upper end of each upper carrier. Two arc-shaped clamping plates are fixedly connected to the ends of every two positioning cylinders close to each other. A working lamp is fixedly installed on the surface of the upper end of each upper carrier. Two heat dissipation holes are opened on the front and rear surfaces of the lower end of each upper carrier.

[0008] As a preferred technical solution of the present invention, the lubrication assembly includes a protective cover. The outer wall of the output shaft at the upper end of the main motor is fixedly sleeved through a bearing with the protective cover, and the upper end of the protective cover is fixedly connected to the lower surface of the test machine table. An outer cylinder is embedded in the middle position of the upper end of the test machine table. An interlocking ring plate is fixedly connected to the inner wall of the lower end of the outer cylinder. An inner cylinder is fixedly connected to the inner wall of the interlocking ring plate. Four infusion holes are opened on the inner wall of the lower end of the inner cylinder.

[0009] As a preferred technical solution of the present invention, two middle input cylinders are fixedly installed on both sides of the upper surface of the outer cylinder. A inner input ring is fixedly connected to the lower end of each of the two middle input cylinders.

[0010] As a preferred technical solution of the present invention, four transfer pipes are embedded in the lower surface of the interlocking ring plate. An inner plug is clamped in the inner cavity of the upper end of each transfer pipe. Two limiting holes are opened on both sides of the bottom surface of each inner plug. Two inner fixing rods are inserted into the inner cavities of the two limiting holes, and the upper ends of the two inner fixing rods are fixedly connected to the upper surface of the inner cavity of the transfer pipe. A positioning spring is fixedly connected to the opposite surface of each inner plug and each transfer pipe.

[0011] As a preferred technical solution of the present invention, an oil delivery pipe is communicated with the lower surface of each transfer pipe. A diffusion ball is fixedly connected to the inner wall of the end of each oil delivery pipe away from the transfer pipe. An auger blade is fixedly connected to the inner wall of the lower end of each transfer pipe.

[0012] As a preferred technical solution of the present invention, the test assembly includes an upward adjustment cylinder. The bottom of the upward adjustment cylinder is fixedly connected to the middle position of the upper surface of the frame. A middle connecting plate is fixedly connected to the lower end of the upward adjustment cylinder. Four sound insulation covers are fixedly connected to the side of the middle connecting plate.

[0013] As a preferred technical solution of the present invention, each of the mufflers includes an outer cover, and a sound insulation layer is embedded inside the outer cover.

[0014] As a preferred technical solution of the present invention, on the inner wall of each muffler away from the outer cylinder, a first clamping sleeve is fixedly connected, a first loudspeaker is clamped inside each first clamping sleeve, a test cylinder is fixedly installed at the middle position of the upper surface of each muffler, a second clamping sleeve is fixedly connected to the lower end of each test cylinder, a second loudspeaker is clamped inside the inner cavity of each second clamping sleeve, two main carrier plates are fixedly connected to the middle positions of the inner walls on both sides of the front end of the frame, an electroacoustic tester is installed on the upper surface of the left main carrier plate, and a data analyzer is installed on the upper surface of the right main carrier plate.

[0015] The beneficial effects of the present invention are as follows: 1. For this directional sound field generating device for testing microphone diaphragms, through the provided commutation component, first, controlling the start of the positioning cylinders on both sides can drive the arc-shaped clamping plates on both sides to fully contact the surface of the microphone diaphragm. At this time, the clamping and positioning of multiple diaphragms are quickly completed, enabling the detection device to have the function of synchronously testing multiple diaphragms, greatly improving the testing speed of the diaphragms. And by controlling the distance between the arc-shaped clamping plates on both sides, it is convenient to clamp diaphragms with different diameters, thus facilitating the detection of different types of microphone diaphragms. Then, controlling the start of the main motor can drive the commutation gear to rotate. The rotation of the commutation gear can drive multiple outer slave gears and outer slave shafts to rotate simultaneously. The rotation of multiple outer slave shafts can drive multiple upper carrier seats and diaphragms to rotate simultaneously. By controlling the rotation of the diaphragms, it is convenient for the testing component to perform directional sound field detection at multiple angles. Finally, controlling the start of the rotary cylinder can drive the upper carrier seat and the diaphragm to rotate simultaneously, which can quickly adjust the tilt angle of the diaphragm, effectively increasing the detection range of the detection device for the diaphragm. At the same time, automatically adjusting the tilt angle of the diaphragm avoids the shutdown and restart of the detection device, further accelerating the working efficiency of the detection device.

[0016] 2. The directional sound field generating device for testing the microphone element, through the provided lubrication component, first controls the start of the middle transmission cylinder to drive the inner transmission ring to move downward. When the inner transmission ring moves downward, it can drive the lubricating oil to push the inner plug downward. When the inner plug fully disengages from the inner cavity at the upper end of the middle transfer pipe, the lubricating oil can automatically flow downward. Then, the oil delivery pipe transfers the extruded lubricating oil to the meshing positions of the outer slave gear and the reversing gear respectively, effectively completing the automatic lubrication of the transmission structure and greatly improving the service life of the detection equipment. Finally, the diffusion ball can disperse and spray the lubricating oil, increasing the spraying range of the lubricating oil downward, thereby accelerating the lubrication rate of the transmission structure. The design of the shape of the diffusion ball itself can not only disperse the lubricating oil but also drip the lubricating oil downward, greatly improving the user experience.

[0017] 3. The directional sound field generating device for testing the microphone element, through the provided testing component, first controls the start of the upward adjustment cylinder to drive multiple sound-absorbing covers to snap downward into the inside of the sealing groove. Speaker 1 can test the off-axis response, anti-interference ability, and sound field symmetry calibration of the microphone element for the microphone, improving the accuracy of the element detection results first. Then, Speaker 2 can test the vertical direction directivity of the element. By using Speaker 1 and Speaker 2 in combination, it is convenient to perform directional sound field detection on different types of microphone elements, and it enables the detection equipment to adapt to the detection environments of multiple elements. Then, controlling the start of the testing cylinder can drive the second clamp and Speaker 2 to move downward simultaneously. By controlling the height of Speaker 2, the vertical direction sound field tests at multiple heights can be realized, effectively improving the practicality of the detection equipment. Finally, controlling the start of the electroacoustic tester and the data analyzer, the electroacoustic tester can detect and record the directional sound fields of the element in different directions, and then the data analyzer can record and statistically analyze the sound field detection data of different frequency sound waves, different models, and different directions, and can quickly obtain the report of the detection data, further improving the practicality of the detection equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. In the drawings: Figure 1 is a schematic structural diagram of a directional sound field generating device for testing a microphone element of the present invention; Figure 2 is a front view of a directional sound field generating device for testing a microphone element of the present invention; Figure 3 is a schematic structural diagram of a directional sound field generating device for testing a microphone element of the present invention from the left side view; Figure 4 is a front cross-sectional view of a directional sound field generating device for testing a microphone diaphragm of the present invention; Figure 5 is a perspective view of a directional sound field generating device for testing a microphone diaphragm of the present invention; Figure 6 is a Figure 5 structural schematic diagram of the lower perspective of a directional sound field generating device for testing a microphone diaphragm of the present invention; Figure 7 is a side cross-sectional view of a directional sound field generating device for testing a microphone diaphragm of the present invention; Figure 8 is a Figure 7 structural schematic diagram of the left perspective of a directional sound field generating device for testing a microphone diaphragm of the present invention; Figure 9 is a perspective view of a partial structure of an annular component of a directional sound field generating device for testing a microphone diaphragm of the present invention; Figure 10 is a Figure 9 structural schematic diagram of the lower perspective of a directional sound field generating device for testing a microphone diaphragm of the present invention; Figure 11 is a Figure 4 magnified view of part A in a directional sound field generating device for testing a microphone diaphragm of the present invention; Figure 12 is a Figure 5 magnified view of part B in a directional sound field generating device for testing a microphone diaphragm of the present invention; Figure 13 is a Figure 5 magnified view of part C in a directional sound field generating device for testing a microphone diaphragm of the present invention; Figure 14 is a Figure 5 magnified view of part D in a directional sound field generating device for testing a microphone diaphragm of the present invention; Figure 15 is a Figure 5 magnified view of part E in a directional sound field generating device for testing a microphone diaphragm of the present invention; Figure 16 is a Figure 7 magnified view of part F in a directional sound field generating device for testing a microphone diaphragm of the present invention.

[0019] In the figure: 1. Testing machine platform; 2. Commutation component; 201. Support carrier; 202. Sealing groove; 203. Outer slave shaft; 204. Outer slave gear; 205. Main motor; 206. Commutation gear; 207. U-shaped mounting frame; 208. Rotary cylinder; 209. Upper carrier seat; 210. Power connection base; 211. Positioning cylinder; 212. Arc-shaped clamping plate; 213. Working lamp; 214. Heat dissipation hole; 3. Lubrication component; 301. Protective cover; 302. Outer cylinder; 303. Interconnected link plate; 304. Inner cylinder; 305. Infusion hole; 306. Middle infusion cylinder; 307. Inner infusion ring; 308. Transfer pipe; 309. Inner plug; 310. Limit hole; 311. Inner fixing rod; 312. Positioning spring; 313. Oil delivery pipe; 314. Diffusion ball; 315. Auger blade; 4. Frame; 5. Testing component; 501. Upper adjusting cylinder; 502. Middle connecting plate; 503. Muffler; 5031. Outer cover; 5032. Sound insulation layer; 504. Jacket one; 505. Speaker one; 506. Testing cylinder; 507. Jacket two; 508. Speaker two; 509. Main carrier plate; 510. Electro-acoustic tester; 511. Data analyzer. Specific embodiments

[0020] The following is a description of the preferred embodiments of the present invention with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not intended to limit the present invention.

[0021] Embodiment: As Figures 1 - 16 shown, a directional sound field generating device for testing a microphone microphone core according to the present invention includes a testing machine platform 1. A commutation component 2 is installed at the middle position of the upper surface of the testing machine platform 1 for rotating the microphone microphone core and adjusting the angle of the microphone core. A lubrication component 3 is arranged at the middle position of the commutation component 2 for lubricating the transmission structure. Fixedly connected to the upper surfaces at both ends of the testing machine platform 1 are frames 4, and fixedly installed on the upper surface of the frames 4 is a testing component 5 for synchronously testing multiple microphone cores.

[0022] The commutation component 2 includes a support stage 201. The lower end of the support stage 201 is fixedly connected to the upper surface of the testing machine stage 1. Four sealing grooves 202 are formed on the upper surface of the support stage 201. An outer slave shaft 203 is embedded in the middle position of the bottom surface of each sealing groove 202 through a bearing. A slave gear 204 is fixedly sleeved on the lower end of each outer slave shaft 203. A main motor 205 is fixedly installed at the middle position of the upper surface of the testing machine stage 1. The upper end of the main motor 205 is fixedly connected to a commutation gear 206 that meshes with the outer slave gear 204. A U-shaped mounting frame 207 is fixedly connected to the upper end of each outer slave shaft 203. A rotary cylinder 208 is fixedly installed on the outer surface of each U-shaped mounting frame 207. A upper carrier base 209 is fixedly sleeved on the piston rod surface of each rotary cylinder 208. A power connection base 210 is fixedly installed on the bottom surface of the inner cavity of each upper carrier base 209. Two positioning cylinders 211 are fixedly installed on both side surfaces of the upper end of each upper carrier base 209. Two arc-shaped clamping plates 212 are fixedly connected to the ends of every two positioning cylinders 211 that are close to each other. A working lamp 213 is fixedly installed on the upper surface of each upper carrier base 209. Two heat dissipation holes 214 are formed on the front and rear surfaces of the lower end of each upper carrier base 209.

[0023] Among them, through the arranged commutation component 2, first, controlling the positioning cylinder 211 to start can drive the two arc-shaped clamping plates 212 to clamp and position the microphone diaphragm to be tested. At this time, controlling the speaker one 505 to start can release sound waves of different frequencies. Subsequently, the diaphragm will collect the sound waves. Then, controlling the main motor 205 to start can drive the commutation gear 206 to rotate. The rotation of the commutation gear 206 can drive multiple outer slave gears 204 and outer slave shafts 203 to rotate simultaneously. The rotation of multiple outer slave shafts 203 can drive multiple upper carrier bases 209 and the diaphragm to rotate simultaneously. By controlling the rotation of the diaphragm, it is convenient for the testing component 5 to perform directional sound field detection on it at multiple angles. Finally, controlling the rotary cylinder 208 to start can drive the upper carrier base 209 and the diaphragm to rotate simultaneously. In this way, the tilt angle of the diaphragm can be quickly adjusted, effectively improving the detection range of the detection device for the diaphragm. At the same time, automatically adjusting the tilt angle of the diaphragm avoids the shutdown and restart of the detection device, further accelerating the working efficiency of the detection device.

[0024] Among them, through the arranged power connection base 210, three conductive grooves are formed in the power connection base 210 for realizing the connection of two-pin and three-pin microphone diaphragms to be tested, improving the practicability of the detection device.

[0025] Among them, through the arranged working lamp 213 and heat dissipation holes 214, first, the working lamp 213 can detect in real time whether the connection between the microphone core to be tested and the power connection base 210 is energized. When plugged in, the working lamp 213 lights up, indicating normal power supply, and when plugged in, the working lamp 213 goes out, indicating a power failure, thus facilitating the tester to replace the new microphone core to be tested in time. Then, the heat dissipation holes 214 can dissipate the heat generated at the connection between the microphone core to be tested and the power connection base 210, thereby increasing the service life of the commutation component 2.

[0026] The lubrication component 3 includes a protective cover 301. The outer wall of the output shaft at the upper end of the main motor 205 is fixedly sleeved with the protective cover 301 through a bearing, and the upper end of the protective cover 301 is fixedly connected to the lower surface of the test machine table 1. The middle part of the upper end of the test machine table 1 is embedded with an outer cylinder 302. The inner wall of the lower end of the outer cylinder 302 is fixedly connected with an interlocking ring plate 303. The inner wall of the interlocking ring plate 303 is fixedly connected with an inner cylinder 304. Four infusion holes 305 are opened on the inner wall of the lower end of the inner cylinder 304; two middle input cylinders 306 are fixedly installed on both sides of the upper surface of the outer cylinder 302. The lower ends of the two middle input cylinders 306 are both fixedly connected with an inner input ring 307; four transfer pipes 308 are embedded in the lower surface of the interlocking ring plate 303. The inner cavity of the upper end of each transfer pipe 308 is clamped with an inner plug 309. Two limiting holes 310 are opened on both sides of the bottom surface of each inner plug 309. Two inner fixing rods 311 are inserted into the inner cavities of the two limiting holes 310, and the upper ends of the two inner fixing rods 311 are fixedly connected to the upper surface of the inner cavity of the transfer pipe 308. A positioning spring 312 is fixedly connected to the opposite surface of each inner plug 309 and each transfer pipe 308; the lower surface of each transfer pipe 308 is communicated with an oil delivery pipe 313. A diffusion ball 314 is fixedly connected to the inner wall of one end of each oil delivery pipe 313 away from the transfer pipe 308. A screw blade 315 is fixedly connected to the inner wall of the lower end of each transfer pipe 308.

[0027] Among them, through the lubrication component 3 set, first, controlling the start of the middle input cylinder 306 can drive the inner input ring 307 to move downward. The downward movement of the inner input ring 307 can drive the lubricating oil to push the inner sealing plug 309 downward. When the inner sealing plug 309 fully disengages from the inner cavity at the upper end of the transfer pipe 308, the lubricating oil can automatically flow downward at this time. Then, the oil delivery pipe 313 delivers the extruded lubricating oil to the meshing positions of the outer slave gear 204 and the reversing gear 206 respectively, so that the automatic lubrication of the transmission structure can be effectively completed. And the lubricating oil that drops after the gear is lubricated will be delivered to the bearing at the middle position of the protective cover 301, so that the bearing can be lubricated. Controlling the start of the middle input cylinder 306 again can drive the inner input ring 307 to move upward. When the inner input ring 307 moves upward to the initial position, the positioning spring 312 can pull the inner sealing plug 309 upward to seal the transfer pipe 308 again. Finally, the liquid injection hole 305 can deliver the lubricating liquid in the inner cylinder 304 above the interlocking ring plate 303 again, so that the lubrication component 3 can be continuously used, which greatly improves the service life of the detection equipment.

[0028] Among them, through the screw blade 315 set, the screw blade 315 can automatically stir the lubricating oil passing through the transfer pipe 308, thereby effectively preventing the precipitation of the transported lubricating oil and improving the use effect of the lubricating oil.

[0029] The test component 5 includes an upward adjustment cylinder 501. The bottom of the upward adjustment cylinder 501 is fixedly connected to the middle position on the upper surface of the frame 4. The lower end of the upward adjustment cylinder 501 is fixedly connected with a middle connecting plate 502. Four sound insulation covers 503 are fixedly connected to the side of the middle connecting plate 502; each sound insulation cover 503 includes an outer cover 5031, and a sound insulation layer 5032 is embedded in the interior of the outer cover 5031; on the inner wall of each sound insulation cover 503 on the side away from the outer cylinder 302, a clamping sleeve one 504 is fixedly connected, and a speaker one 505 is clamped in the interior of each clamping sleeve one 504. At the middle position on the upper surface of each sound insulation cover 503, a test cylinder 506 is fixedly installed. The lower end of each test cylinder 506 is fixedly connected with a clamping sleeve two 507, and a speaker two 508 is clamped in the inner cavity of each clamping sleeve two 507. Two main carrier plates 509 are fixedly connected to the middle positions on the inner walls of both sides at the front end of the frame 4. An electroacoustic tester 510 is installed on the upper surface of the left main carrier plate 509, and a data analyzer 511 is installed on the upper surface of the right main carrier plate 509.

[0030] Among them, through the provided outer cover 5031 and sound insulation layer 5032, first, the outer cover 5031 can preferentially isolate noise, and then the sound insulation layer 5032 can fully absorb and isolate the external noise during detection. By the combined use of the outer cover 5031 and the sound insulation layer 5032, the detection environment of the microphone core to be measured is greatly improved. At the same time, the accuracy of the detection results of the detection equipment is further improved.

[0031] During operation, first, the standard microphone is clamped on the power connection base 210, and then by controlling the positioning cylinders 211 on both sides to start, the arc-shaped clamping plates 212 on both sides can be driven to move in opposite directions. When the approaching surfaces of the arc-shaped clamping plates 212 on both sides are in full contact with the surface of the standard microphone, the clamping and fixing of the standard microphone are completed at this time. Then, the standard microphone is started to calibrate the sound field. After the calibration is completed, by starting the positioning cylinders 211, the standard microphone can be taken out. Then, the microphone core to be measured is clamped into the power connection base 210, and by controlling the positioning cylinders 211 to start again, the two arc-shaped clamping plates 212 can be driven to clamp and position the microphone core to be measured. At this time, by controlling the speaker one 505 to start, sound waves of different frequencies can be released. Subsequently, the microphone core will collect the sound waves. Then, by controlling the main motor 205 to start, the reversing gear 206 can be driven to rotate. The rotation of the reversing gear 206 can drive multiple outer slave gears 204 and outer slave shafts 203 to rotate simultaneously. The rotation of multiple outer slave shafts 203 can drive multiple upper carrier seats 209 and the microphone core to rotate simultaneously. By controlling the rotation of the microphone core, it is convenient for the test component 5 to perform directional sound field detection on it at multiple angles. The microphone core will convert the sound signal into an electrical signal and transmit it to the electroacoustic tester 510. The electroacoustic tester 510 can detect and record the directional sound field of the microphone core in different directions. Then, by controlling the test cylinder 506 to start, the jacket two 507 and the speaker two 508 can be driven to move downward simultaneously. By controlling the height of the speaker two 508, the vertical direction sound field test at multiple heights can be realized. At this time, by controlling the rotary cylinder 208 to start, the upper carrier seat 209 and the microphone core can be driven to rotate simultaneously. In this way, the tilt angle of the microphone core can be quickly adjusted, and the microphone core can be quickly adjusted to the vertical and horizontal states. In this way, the test component 5 can perform an all-round directional sound field test on the microphone core. Among them, the electroacoustic tester 510 can transmit the electrical signal to the data analyzer 511. Finally, by controlling the data analyzer 511 to start, the detection data of the sound fields with different frequencies, different models, and different directions can be recorded and statistically analyzed, and a report of the detection data can be quickly obtained. Self-lubrication of the transmission structure: First, controlling the start of the middle transmission cylinder 306 can drive the inner transmission ring 307 to move downward. When the inner transmission ring 307 moves downward, it can drive the lubricating oil to push the inner sealing plug 309 downward. When the inner sealing plug 309 is fully separated from the inner cavity at the upper end of the middle transfer pipe 308, the lubricating oil can automatically flow downward at this time. Then, the oil delivery pipe 313 delivers the extruded lubricating oil to the meshing position of the outer slave gear 204 and the reversing gear 206 respectively, so that the automatic lubrication of the transmission structure can be effectively completed. Moreover, the lubricating oil that drops after the gear is lubricated will be delivered to the bearing at the middle position of the protective cover 301, so as to lubricate the bearing. Controlling the start of the middle transmission cylinder 306 again can drive the inner transmission ring 307 to move upward. When the inner transmission ring 307 moves upward to the initial position, the positioning spring 312 can pull the inner sealing plug 309 upward to seal the middle transfer pipe 308 again. Finally, the liquid injection hole 305 can deliver the lubricating liquid in the inner cylinder 304 to the upper part of the interlocking ring plate 303 again, so that the lubrication assembly 3 can be continuously used.

[0032] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A directional sound field generating device for testing a microphone core, comprising a testing machine (1), characterized in that: The test machine (1) is provided with a reversing assembly (2) at a middle position on its upper surface, which is used to rotate the microphone core and adjust the angle of the microphone core; the reversing assembly (2) is provided with a lubricating assembly (3) at a middle position thereof, which is used to lubricate the transmission structure; the upper surfaces of both ends of the test machine (1) are fixedly connected to a frame (4); the upper surface of the frame (4) is fixedly provided with a test assembly (5) for synchronously testing multiple microphone cores; The reversing assembly (2) comprises a support platform (201), the lower end of the support platform (201) is fixedly connected to the upper surface of the test machine (1), the upper surface of the support platform (201) is provided with four sealing grooves (202), the middle position of the bottom surface of the inner cavity of each sealing groove (202) is embedded with an external slave shaft (203) through a bearing, the lower end of each external slave shaft (203) is fixedly sleeved with an external slave gear (204), the test machine (1) is fixedly mounted with a main motor (205) at the middle position of its upper surface, and the upper end of the main motor (205) is fixedly connected with a reversing gear (206) meshing with the external slave gear (204).

2. A directional sound field generating device for testing a microphone core according to claim 1, characterized in that: The upper end of each external slave shaft (203) is fixedly connected to a U-shaped mounting frame (207), the outer surface of each U-shaped mounting frame (207) is fixedly mounted with a rotary cylinder (208), the piston rod surface of each rotary cylinder (208) is fixedly sleeved with an upper carrier (209), and the bottom surface of the inner cavity of each upper carrier (209) is fixedly mounted with an electrical connection base (210).

3. A directional sound field generating device for testing a microphone core according to claim 2, characterized in that: Each upper carrier (209) has two positioning cylinders (211) fixedly mounted on both side surfaces at its upper end, and two arc-shaped clamping plates (212) are fixedly connected to one end of each two positioning cylinders (211) close to each other. Each upper carrier (209) has a working light (213) fixedly mounted on its upper surface, and each upper carrier (209) has two heat dissipation holes (214) disposed on its front and rear surfaces at its lower end.

4. The directional sound field generating device for testing a microphone core according to claim 3, characterized in that: The lubrication assembly (3) comprises a protective cover (301), the outer wall of the output shaft at the upper end of the main motor (205) is fixedly sleeved with the protective cover (301) via a bearing, and the upper end of the protective cover (301) is fixedly connected to the lower surface of the test machine (1), an outer cylinder (302) is embedded in the middle of the upper end of the test machine (1), an interconnected ring plate (303) is fixedly connected to the inner wall of the outer cylinder (302) at the lower end, an inner cylinder (304) is fixedly connected to the inner wall of the interconnected ring plate (303), and four infusion holes (305) are opened on the inner wall of the inner cylinder (304) at the lower end.

5. A directional sound field generating device for testing a microphone core according to claim 4, characterized in that: Two intermediate gas delivery cylinders (306) are fixedly mounted on both sides of the upper surface of the outer cylinder (302), and the lower ends of the two intermediate gas delivery cylinders (306) are each fixedly connected to an inner gas delivery ring (307).

6. A directional sound field generating device for testing a microphone core according to claim 5, characterized in that: Four transfer tubes (308) are embedded in the lower surface of the interconnected ring plate (303), and an inner sealing plug (309) is clamped in the inner cavity of the upper end of each transfer tube (308), and two limiting holes (310) are provided on both sides of the bottom surface of each inner sealing plug (309), and two inner fixing rods (311) are inserted into the inner cavity of the two limiting holes (310), and the upper ends of the two inner fixing rods (311) are fixedly connected to the upper surface of the inner cavity of the transfer tube (308), and a positioning spring (312) is fixedly connected to the side of each inner sealing plug (309) opposite to each transfer tube (308).

7. The directional sound field generating device for testing a microphone core according to claim 6, characterized in that: The lower surface of each transfer pipe (308) is connected to an oil delivery pipe (313), the inner wall of each oil delivery pipe (313) at one end away from the transfer pipe (308) is fixedly connected to a diffusion ball (314), and the inner wall of each transfer pipe (308) at its lower end is fixedly connected to an auger blade (315).

8. The directional sound field generating device for testing a microphone core according to claim 7, characterized in that: The test assembly (5) comprises an upward adjustment cylinder (501), the bottom of the upward adjustment cylinder (501) is fixedly connected to the middle position of the upper surface of the frame (4), the lower end of the upward adjustment cylinder (501) is fixedly connected to a central connecting plate (502), and the side of the central connecting plate (502) is fixedly connected to four silencer covers (503).

9. A directional sound field generating device for testing a microphone core according to claim 8, characterized in that: Each of the sound-absorbing covers (503) comprises an outer cover (5031), and a sound insulation layer (5032) is embedded inside the outer cover (5031).

10. A directional sound field generating device for testing a microphone core according to claim 9, characterized in that: A jacket 1 (504) is fixedly connected to the inner wall of each muffler (503) on the side away from the outer cylinder (302), a speaker 1 (505) is clamped inside each jacket 1 (504), a test cylinder (506) is fixedly installed in the middle of the upper surface of each muffler (503), a jacket 2 (507) is fixedly connected to the lower end of each test cylinder (506), and a speaker 2 (508) is clamped in the inner cavity of each jacket 2 (507), and two main carrier plates (509) are fixedly connected to the middle of the inner walls on both sides of the front end of the frame (4), an electroacoustic tester (510) is installed on the upper surface of the left main carrier plate (509), and a data analyzer (511) is installed on the upper surface of the right main carrier plate (509).

Images