A directional sound field generating device for testing microphone core

Abstract

The present invention discloses a directional sound field generating device for testing a microphone core, which relates to the technical field of microphone testing, and comprises a testing machine, wherein the testing machine is provided with a reversing component at a middle position on an upper surface thereof, which is used for rotating the microphone core and adjusting the angle of the microphone core; the reversing component is provided with a lubrication component at a middle position thereof, which is used for lubricating a transmission structure; the present invention first controls the start-up of an upward adjustment cylinder to drive a plurality of muffler covers to be downwardly inserted into the interior of a sealing groove; a first loudspeaker can test the microphone core for off-axis response, anti-interference capability, and sound field symmetry, thereby first improving the accuracy of the microphone core detection result; and then a second loudspeaker can perform a vertical directionality test on the microphone core; and through the coordinated use of the first loudspeaker and the second loudspeaker, directional sound field detection of different types of microphone cores can be conveniently performed, and the detection equipment can be enabled to adapt to the detection environment of multiple microphone cores.

Description

Technical Field

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

[0002] The microphone core is an important component of the microphone structure. It is an energy conversion device that converts sound signals into electrical signals. It is a device that is exactly the opposite of the speaker. It is the two terminals of the sound equipment. The microphone head is the input end and the speaker is the output end. The microphone heads after production need to be tested. Only after the tested microphone heads are qualified can they be allowed to be used. The inspection of microphone heads is more complicated and requires uninterrupted testing with sound waves of multiple frequencies. Only when the change in the generated current meets the standard value can it be identified as a qualified product.

[0003] At present, most of the testing equipment at this stage performs testing through manual frequency modulation. During the testing process, problems such as noise have always interfered with the accuracy of the experimental data. In addition, the existing testing equipment mostly tests the microphone core in a single test, which has low testing efficiency. In addition, the placement angle of the microphone core needs to be manually adjusted multiple times during the test, which causes the testing equipment to be turned off and then on multiple times. This excessive repetitive operation will increase the testing burden of the testing equipment and is more likely to cause damage to the testing equipment. At the same time, it greatly reduces the user experience. Summary of the Invention

[0004] In order to solve the defects of the prior art, the present invention provides a directional sound field generating device for testing a microphone core.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] The present invention provides a directional sound field generating device for testing microphone cores, comprising a test platform, wherein a reversing assembly is installed in the middle of the upper surface of the test platform for rotating the microphone core and adjusting the angle of the microphone core. A lubrication assembly is provided in the middle of the reversing assembly for lubricating the transmission structure. The upper surfaces of both ends of the test platform are fixedly connected to a frame, and the upper surface of the frame is fixedly mounted with a test assembly for synchronously testing multiple microphone cores.

[0007] The reversing assembly includes a supporting platform, the lower end of the supporting platform is fixedly connected to the upper surface of the test machine, four sealing grooves are opened on the upper surface of the supporting platform, an external slave shaft is embedded in the middle position of the bottom surface of the inner cavity of each sealing groove through a bearing, and an external slave gear is fixedly sleeved on the lower end of each external slave shaft, the test machine is fixedly installed with a main motor in the middle position of its upper surface, and the upper end of the main motor is fixedly connected to a reversing gear meshing with the external slave gear.

[0008] As a preferred technical solution of the present invention, the upper end of each outer slave shaft is fixedly connected to a U-shaped bracket, the outer surface of each U-shaped bracket is fixedly installed with a rotating cylinder, the piston rod surface of each rotating cylinder is fixedly sleeved with an upper carrier, and the bottom surface of the inner cavity of each upper carrier is fixedly installed with an electrical base.

[0009] As a preferred technical solution of the present invention, each of the upper carriers is fixedly mounted with two positioning cylinders on both side surfaces at its upper end, and two arc-shaped clamping plates are fixedly connected to one end of each two positioning cylinders close to each other, and each of the upper carriers is fixedly mounted with a work light on its upper end surface, and each of the upper carriers is provided with two heat dissipation holes on the front and rear surfaces at its lower end.

[0010] 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 with the protective cover through a bearing, and the upper end of the protective cover is fixedly connected to the lower surface of the test machine, an outer cylinder is embedded in the middle position of the upper end of the test machine, the inner wall of the outer cylinder at its lower end is fixedly connected to an interconnected ring plate, the inner wall of the interconnected ring plate is fixedly connected to an inner cylinder, and the inner wall of the inner cylinder at its lower end is provided with four infusion holes.

[0011] As a preferred technical solution of the present invention, two intermediate gas cylinders are fixedly installed on both sides of the upper surface of the outer cylinder, and the lower ends of the two intermediate gas cylinders are fixedly connected to an inner gas ring.

[0012] As a preferred technical solution of the present invention, four transfer tubes are embedded in the lower surface of the interconnected ring plate, and an inner sealing plug is clamped in the inner cavity of the upper end of each transfer tube, and each inner sealing plug is provided with two limiting holes on both sides of its bottom surface, and two inner fixing rods are inserted into the inner cavity 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 tube, and a positioning spring is fixedly connected to the side of each inner sealing plug opposite to each transfer tube.

[0013] As a preferred technical solution of the present invention, the lower surface of each transfer pipe is connected to an oil pipeline, the inner wall of each oil pipeline away from the end of the transfer pipe is fixedly connected to a diffusion ball, and the inner wall of each transfer pipe at its lower end is fixedly connected to an auger blade.

[0014] As a preferred technical solution of the present invention, the test assembly includes an upward adjustment cylinder, the bottom of which is fixedly connected to the middle position of the upper surface of the frame, the lower end of which is fixedly connected to a central connecting plate, and the side of the central connecting plate is fixedly connected to four silencers.

[0015] As a preferred technical solution of the present invention, each of the sound-absorbing covers includes an outer cover, and a sound insulation layer is embedded in the interior of the outer cover.

[0016] As a preferred technical solution of the present invention, each of the silencers is fixedly connected to an inner wall away from the outer cylinder with a jacket 1, and a loudspeaker 1 is clamped inside the inner wall of each of the jackets 1, and a test cylinder is fixedly installed in the middle position of the upper surface of each of the silencers, and the lower end of each of the test cylinders is fixedly connected to a jacket 2, and a loudspeaker 2 is clamped in the inner cavity of each of the jackets 2, and two main carrier boards are fixedly connected to the middle position 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 board, and a data analyzer is installed on the upper surface of the right main carrier board.

[0017] The beneficial effects of the present invention are:

[0018] 1. This type of directional sound field generating device for testing microphone cores uses a reversing component to first control the positioning cylinders on both sides to start up, which can drive the arc-shaped clamping plates on both sides to fully contact the surface of the microphone core. At this time, multiple microphone cores are quickly clamped and positioned, which can enable the testing equipment to have the function of synchronously testing multiple microphone cores, greatly improving the testing rate of the microphone cores. By controlling the distance between the arc-shaped clamping plates on both sides, microphone cores of different diameters can be easily clamped, thereby facilitating the testing of microphone cores of different models. Then, the main motor is controlled to start up to drive the reversing gear. When the wheel rotates, the reversing gear rotates, which can drive multiple external slave gears and external slave shafts to rotate at the same time. The rotation of multiple external slave shafts can drive multiple upper carriers and microphone cores to rotate at the same time. By controlling the rotation of the microphone core, it is convenient for the test component to perform directional sound field detection at multiple angles. Finally, controlling the start of the rotary cylinder can drive the upper carrier and the microphone core to rotate at the same time. In this way, the tilt angle of the microphone core can be quickly adjusted, thereby effectively improving the detection range of the detection equipment for the microphone core. At the same time, the automatic adjustment of the tilt angle of the microphone core avoids the shutdown and restart of the detection equipment, further accelerating the working efficiency of the detection equipment.

[0019] 2. This type of directional sound field generating device for testing the microphone core, through the set lubrication component, first controls the start of the intermediate air cylinder to drive the inner air ring to move downward, and the downward movement of the inner air ring can drive the lubricating oil to push the inner seal downward. When the inner seal is fully separated from the inner cavity at the upper end of the transfer tube, the lubricating oil can be automatically transmitted downward, and then the oil pipe transmits the extruded lubricating oil to the meshing parts of the outer follower gear and the reversing gear respectively, so that the automatic lubrication of the transmission structure can be effectively completed, and the service life of the detection equipment is greatly improved. Finally, the diffusion ball can disperse the lubricating oil and spray it out, thereby increasing the downward spraying range of the lubricating oil, thereby accelerating the lubrication rate of the transmission structure. The shape of the diffusion ball itself is designed to both diffuse the lubricating oil and drip the lubricating oil downward, which greatly improves the user experience.

[0020] 3. This type of microphone core test uses a directional sound field generating device. Through the set test components, first control the upward adjustment cylinder to start, which can drive multiple silencers to snap downward into the inside of the sealing groove. Speaker 1 can test the microphone core's off-axis response, anti-interference ability test, and sound field symmetry calibration, which first improves the accuracy of the microphone core test results. Then speaker 2 can test the vertical directionality of the microphone core. Through the coordinated use of speaker 1 and speaker 2, it is convenient to perform directional sound field detection on different types of microphone cores, and enable the detection equipment to adapt to the detection of multiple microphone cores. Environment, and then controlling the start of the test cylinder can drive the jacket 2 and the speaker 2 to move downward at the same time. By controlling the height of the speaker 2, the vertical sound field test at multiple heights can be realized, thereby effectively improving the practicality of the detection equipment. Finally, the electroacoustic tester and the data analyzer are controlled to start. The electroacoustic tester can detect the directional sound field in different directions of the microphone core and record the results. Then the data analyzer can record and count the sound field detection data of different frequency waves, different models, and different directions, and can quickly produce a report on the detection data, which further improves the practicality of the detection equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 This is a schematic structural diagram of a directional sound field generating device for testing a microphone core according to the present invention;

[0023] Figure 2 This is a front view of a directional sound field generating device for testing a microphone core according to the present invention;

[0024] Figure 3This is a schematic structural diagram of a directional sound field generating device for testing a microphone core according to the present invention from a left side perspective;

[0025] Figure 4 This is a front cross-sectional view of a directional sound field generating device for testing a microphone core according to the present invention;

[0026] Figure 5 This is a stereoscopic diagram of a directional sound field generating device for testing a microphone core according to the present invention;

[0027] Figure 6 The present invention is a directional sound field generating device for testing the microphone core Figure 5 Schematic diagram of the structure from the bottom perspective;

[0028] Figure 7 This is a side cross-sectional view of a directional sound field generating device for testing a microphone core according to the present invention;

[0029] Figure 8 The present invention is a directional sound field generating device for testing the microphone core Figure 7 Structural diagram from the left perspective;

[0030] Figure 9 This is a three-dimensional diagram of the structure of the annular component of a directional sound field generating device for testing a microphone core of the present invention;

[0031] Figure 10 The present invention is a directional sound field generating device for testing the microphone core Figure 9 Schematic diagram of the structure from the bottom perspective;

[0032] Figure 11 The present invention is a directional sound field generating device for testing the microphone core Figure 4 Enlarged view of point A in the middle;

[0033] Figure 12 The present invention is a directional sound field generating device for testing the microphone core Figure 5 Enlarged view of point B in the middle;

[0034] Figure 13 The present invention is a directional sound field generating device for testing the microphone core Figure 5 Enlarged view of point C in the middle;

[0035] Figure 14 The present invention is a directional sound field generating device for testing the microphone core Figure 5 Enlarged view of point D in the middle;

[0036] Figure 15 The present invention is a directional sound field generating device for testing the microphone core Figure 5 Enlarged view of point E in the middle;

[0037] Figure 16 The present invention is a directional sound field generating device for testing the microphone core Figure 7 Enlarged view of point F in the middle.

[0038] Figure: 1. Test machine; 2. Reversing assembly; 201. Support platform; 202. Sealing groove; 203. External slave shaft; 204. External slave gear; 205. Main motor; 206. Reversing gear; 207. U-shaped mounting frame; 208. Rotating cylinder; 209. Upper carrier; 210. Power connection base; 211. Positioning cylinder; 212. Arc clamping plate; 213. Working light; 214. Heat dissipation hole; 3. Lubrication assembly; 301. Protective cover; 302. Outer cylinder; 303. Interconnecting ring plate; 304. Inner cylinder; 305. Infusion hole; 306. Middle infusion cylinder; 307 , inner transfer ring; 308, transfer pipe; 309, inner sealing plug; 310, limit hole; 311, inner fixing rod; 312, positioning spring; 313, oil pipeline; 314, diffuser ball; 315, auger blade; 4, frame; 5, test assembly; 501, upward adjustment cylinder; 502, middle connecting plate; 503, silencer cover; 5031, outer cover; 5032, sound insulation layer; 504, jacket one; 505, speaker one; 506, test cylinder; 507, jacket two; 508, speaker two; 509, main carrier board; 510, electroacoustic tester; 511, data analyzer. DETAILED DESCRIPTION

[0039] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0040] Example: Figures 1-16 As shown, the present invention provides a directional sound field generating device for testing a microphone core, comprising a test platform 1. A reversing assembly 2 is installed at a middle position on the upper surface of the test platform 1 for rotating the microphone core and adjusting the angle of the microphone core. The reversing assembly 2 is provided at a middle position thereon for lubricating the transmission structure. The upper surfaces of both ends of the test platform 1 are fixedly connected to a frame 4. A test assembly 5 is fixedly installed on the upper surface of the frame 4 for synchronously testing multiple microphone cores.

[0041] The reversing assembly 2 includes a supporting platform 201, the lower end of the supporting platform 201 is fixedly connected to the upper surface of the test machine 1, and four sealing grooves 202 are provided on the upper surface of the supporting platform 201. An outer slave shaft 203 is embedded in the middle position of the bottom surface of the inner cavity of each sealing groove 202 through a bearing, and an outer slave gear 204 is fixedly sleeved on the lower end of each outer slave shaft 203. The test machine 1 is fixedly installed with a main motor 205 in the middle position of its upper surface, and the upper end of the main motor 205 is fixedly connected to a reversing gear 206 meshing with the outer slave gear 204; the upper end of each outer slave shaft 203 is fixedly connected to a U-shaped mounting frame 207, and each U-shaped mounting frame A rotating cylinder 208 is fixedly installed on the outer surface of the frame 207, and an upper carrier 209 is fixedly sleeved on the piston rod surface of each rotating cylinder 208. An electric base 210 is fixedly installed on the bottom surface of the inner cavity of each upper carrier 209; two positioning cylinders 211 are fixedly installed on the two side surfaces of the upper end of each upper carrier 209, and two arc-shaped clamping plates 212 are fixedly connected at one end of each two positioning cylinders 211 close to each other. A working lamp 213 is fixedly installed on the surface of the upper end of each upper carrier 209, and two heat dissipation holes 214 are provided on the front and rear surfaces of the lower end of each upper carrier 209.

[0042] Among them, through the reversing component 2 set up, first controlling the positioning cylinder 211 to start can drive the two arc-shaped clamping plates 212 to clamp and position the microphone core to be tested. At this time, controlling the speaker 505 to start can release sound waves of different frequencies, and then the microphone core will collect the sound waves. Then controlling the main motor 205 to start can drive the reversing gear 206 to rotate. The rotation of the reversing gear 206 can drive multiple external slave gears 204 and the external slave shaft 203 to rotate at the same time. The rotation of multiple external slave shafts 203 can drive multiple upper carriers 209 and the microphone core to rotate at the same time. 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. Finally, controlling the rotating cylinder 208 to start can drive the upper carrier 209 and the microphone core to rotate at the same time. In this way, the tilt angle of the microphone core can be quickly adjusted, thereby effectively improving the detection range of the detection equipment for the microphone core. At the same time, automatically adjusting the tilt angle of the microphone core avoids the shutdown and restart of the detection equipment, further accelerating the working efficiency of the detection equipment.

[0043] The power connection base 210 is provided with three conductive slots for connecting a two-pin microphone core to be tested and a three-pin microphone core to be tested, thereby improving the practicability of the detection equipment.

[0044] Among them, through the provided working light 213 and heat dissipation hole 214, first, the working light 213 can detect in real time whether the connection between the microphone core to be tested and the power base 210 is energized. When plugging in, the working light 213 lights up, indicating that the power is normal. When plugging in, the working light 213 goes out, indicating that the power fails, thereby facilitating the inspection personnel to replace the new microphone core to be tested in time. Then, the heat dissipation hole 214 can dissipate the heat generated at the connection between the microphone core to be tested and the power base 210, thereby improving the service life of the reversing component 2.

[0045] The lubrication assembly 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 1. An outer cylinder 302 is embedded in the middle position of the upper end of the test machine 1. The inner wall of the outer cylinder 302 at its lower end is fixedly connected to an interconnected ring plate 303. The inner wall of the interconnected ring plate 303 is fixedly connected to an inner cylinder 304. The inner wall of the inner cylinder 304 at its lower end is provided with four infusion holes 305; two intermediate air cylinders 306 are fixedly installed on both sides of the upper surface of the outer cylinder 302, and the lower ends of the two intermediate air cylinders 306 are fixedly connected to an inner air ring 307; four transfer pipes 308 are embedded in the lower surface of the interconnected ring plate 303, each of which has a plurality of intermediate air cylinders 306. The inner cavity of the upper end of each transfer tube 308 is clamped with an inner sealing plug 309, and each inner sealing plug 309 is provided with two limiting holes 310 on both sides of its bottom surface. The inner cavities of the two limiting holes 310 are inserted with two inner fixing rods 311, 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 each inner sealing plug 309 is fixedly connected to a positioning spring 312 on the side opposite to each transfer tube 308; the lower surface of each transfer tube 308 is connected to an oil pipeline 313, and the inner wall of each oil pipeline 313 away from the end of the transfer tube 308 is fixedly connected to a diffusion ball 314, and the inner wall of each transfer tube 308 at its lower end is fixedly connected to a auger blade 315.

[0046] Among them, by setting the lubricating component 3, first control the middle delivery cylinder 306 to start, which can drive the inner delivery ring 307 to move downward, and the downward movement of the inner delivery ring 307 can drive the lubricating oil to push the inner sealing plug 309 to move downward. When the inner sealing plug 309 is fully separated from the inner cavity at the upper end of the transfer tube 308, the lubricating oil can be automatically transmitted downward, and then the oil delivery pipe 313 transmits the squeezed 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, and the lubricating oil falling after the gear is lubricated will The lubricating fluid is transmitted to the bearing in the middle position of the protective cover 301, so that the bearing can be lubricated. The middle transmission cylinder 306 is controlled to start again to 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 block the transfer tube 308 again. Finally, the infusion hole 305 can transmit the lubricating fluid in the inner cylinder 304 to the top of the interconnected ring plate 303 again. In this way, the lubrication component 3 can be used continuously, which greatly improves the service life of the detection equipment.

[0047] Among them, through the provided auger blades 315, the auger blades 315 can automatically stir the lubricating oil passing through the transfer pipe 308, thereby effectively preventing the transported lubricating oil from precipitating and improving the use effect of the lubricating oil.

[0048] The test assembly 5 includes 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 the middle connecting plate 502, and the side of the middle connecting plate 502 is fixedly connected to four muffler covers 503; each muffler cover 503 includes an outer cover 5031, and the inner wall of the outer cover 5031 is embedded with a sound insulation layer 5032; each muffler cover 503 is fixedly connected to the inner wall of the side away from the outer cylinder 302 with a jacket 504, and the inner wall of each jacket 504 is fixedly connected to the inner wall of the outer cylinder 302. Each of them is clamped with a loudspeaker 505, and a test cylinder 506 is fixedly installed in the middle position of the upper surface of each silencer 503. The lower end of each test cylinder 506 is fixedly connected to a jacket 2 507, and the inner cavity of each jacket 2 507 is clamped with a loudspeaker 2 508. Two main carrier plates 509 are fixedly connected to the middle position 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.

[0049] Among them, by setting the outer cover 5031 and the sound insulation layer 5032, first the outer cover 5031 can isolate the noise first, and then the sound insulation layer 5032 can fully absorb and isolate the external noise during detection. The coordinated use of the outer cover 5031 and the sound insulation layer 5032 greatly improves the detection environment of the microphone core to be tested, and at the same time, further improves the accuracy of the detection results of the detection equipment.

[0050] During operation, first clamp the standard microphone on the power base 210, then control the positioning cylinders 211 on both sides to start, which can drive the arc clamping plates 212 on both sides to move in opposite directions. When the arc clamping plates 212 on both sides are in full contact with the surface of the standard microphone, the clamping and fixation of the standard microphone is completed. At this time, the standard microphone is started to calibrate the sound field. After the calibration is completed, the positioning cylinder 211 is started to complete the removal of the standard microphone, and then the microphone core to be tested is clamped on the power base 210, and then The second control positioning cylinder 211 is started to drive the two arc-shaped clamping plates 212 to clamp and position the microphone core to be tested. At this time, the control speaker 505 is started to release sound waves of different frequencies, and then the microphone core will collect the sound waves. Then the control main motor 205 is started to drive the reversing gear 206 to rotate. The rotation of the reversing gear 206 can drive multiple external slave gears 204 and the external slave shaft 203 to rotate at the same time. The rotation of multiple external slave shafts 203 can drive multiple upper carriers 209 and the microphone core to rotate at the same time. The rotation of the microphone core can facilitate the test assembly 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 the directional sound field in different directions on the microphone core and record the results. Then, controlling the test cylinder 506 to start can drive the jacket 2 507 and the speaker 2 508 to move downward at the same time. By controlling the height of the speaker 2 508, the vertical sound field test of multiple heights can be achieved. At this time, controlling the rotation cylinder 208 to start can drive the upper carrier 209 and the microphone core to rotate at the same time, so that the inclination angle of the microphone core can be quickly adjusted, and the microphone core can be quickly adjusted to a vertical and horizontal state. In this way, the test assembly 5 can perform a full range of directional sound field testing on the microphone core, wherein the electroacoustic tester 510 can transmit the electrical signal to the data analyzer 511. Finally, controlling the data analyzer 511 to start can record and count the sound field detection data of different frequency waves, different models, and different directions, and a report on the detection data can be quickly obtained.

[0051] Self-lubrication of the transmission structure: First, the control of the middle transmission cylinder 306 starts to drive the inner transmission ring 307 to move downward. The downward movement of the inner transmission ring 307 can drive the lubricating oil to push the inner sealing plug 309 to move downward. When the inner sealing plug 309 is fully separated from the inner cavity at the upper end of the transfer tube 308, the lubricating oil can be automatically transmitted downward. Then the oil pipe 313 transmits the squeezed lubricating oil to the meshing part 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 gear lubrication The lubricating oil that falls later will be transferred to the bearing in the middle position of the protective cover 301, so that the bearing can be lubricated. The middle transfer cylinder 306 is controlled to start again to drive the inner transfer ring 307 to move upward. When the inner transfer ring 307 moves upward to the initial position, the positioning spring 312 can pull the inner sealing plug 309 upward to seal the transfer tube 308 again. Finally, the infusion hole 305 can transfer the lubricating liquid in the inner cylinder 304 to the top of the interconnected ring plate 303 again, so that the lubrication assembly 3 can be used continuously.

[0052] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection 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: A reversing assembly (2) is installed in the middle of the upper surface of the test machine (1) for rotating the microphone core and adjusting the angle of the microphone core. A lubricating assembly (3) is provided in the middle of the reversing assembly (2) for lubricating the transmission structure. The upper surfaces of both ends of the test machine (1) are fixedly connected to a frame (4). A test assembly (5) is fixedly installed on the upper surface of the frame (4) for synchronously testing multiple microphone cores. The reversing assembly (2) includes 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 middle position of the upper surface of the test machine (1) is fixedly installed with a main motor (205), and the upper end of the main motor (205) is fixedly connected with a reversing gear (206) meshing with all the external slave gears (204); The upper end of each outer 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); The lubrication assembly (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) via a bearing, and the upper end of the protective cover (301) is fixedly connected to the lower surface of the support platform (201), an outer cylinder (302) is embedded in the middle position of the upper end of the support platform (201), the inner wall of the lower end of the outer cylinder (302) is fixedly connected to an interconnected ring plate (303), the inner wall of the interconnected ring plate (303) is fixedly connected to an inner cylinder (304), and the inner wall of the lower end of the inner cylinder (304) is provided with four infusion holes (305); Four transfer tubes (308) are embedded in the lower surface of the interconnected ring plate (303); 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) away from the transfer pipe (308) is fixedly connected to a diffusion ball (314), and the inner wall of the lower end of each transfer pipe (308) is fixedly connected to an auger blade (315).

2. A directional sound field generating device for testing a microphone core according to claim 1, characterized in that: Positioning cylinders (211) are fixedly mounted on both sides of the upper end of each upper carrier (209), and arc-shaped clamping plates (212) are fixedly connected to the ends of the two positioning cylinders (211) close to each other. A working light (213) is fixedly mounted on the upper end of each upper carrier (209), and two heat dissipation holes (214) are provided on the front and rear surfaces of the lower end of each upper carrier (209).

3. A directional sound field generating device for testing a microphone core according to claim 2, characterized in that: Intermediate gas delivery cylinders (306) are fixedly mounted on both sides of the upper surface of the outer cylinder (302), and the lower end of each intermediate gas delivery cylinder (306) is fixedly connected to an inner gas delivery ring (307).

4. A directional sound field generating device for testing a microphone core according to claim 3, characterized in that: An inner sealing plug (309) is clamped in the inner cavity of the upper end of each transfer tube (308), and a limiting hole (310) is respectively provided on both sides of the bottom surface of each inner sealing plug (309). An inner fixing rod (311) is inserted into the inner cavity of each limiting hole (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).

5. The directional sound field generating device for testing a microphone core according to claim 4, characterized in that: The test assembly (5) includes 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 surfaces of the central connecting plate (502) are fixedly connected to four silencer covers (503).

6. A directional sound field generating device for testing a microphone core according to claim 5, characterized in that: Each of the muffler covers (503) comprises an outer cover (5031), and a sound insulation layer (5032) is embedded inside the outer cover (5031).

7. The directional sound field generating device for testing a microphone core according to claim 6, characterized in that: The inner wall of each muffler (503) away from the outer cylinder (302) is fixedly connected to a jacket 1 (504), and a loudspeaker 1 (505) is clamped inside each jacket 1 (504). A test cylinder (506) is fixedly installed at the middle position of the upper surface of each muffler (503), and the lower end of each test cylinder (506) is fixedly connected to a jacket 2 (507), and the inner cavity of each jacket 2 (507) is clamped to a loudspeaker 2 (508). The middle positions of the inner walls on both sides of the front end of the frame (4) are respectively fixedly connected to main carrier plates (509), 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).

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