Microphone quality automatic detection equipment and detection method

Abstract

The invention discloses microphone quality automatic detection equipment and a detection method, and belongs to the technical field of microphone quality detection.The microphone quality automatic detection equipment comprises a bottom plate and a bottom frame installed on the bottom plate, a workbench is installed on the bottom frame, a moving assembly is installed on the workbench, a rotating assembly is installed on the moving assembly, and a detection assembly is installed on the bottom plate; a rotating assembly is installed on the bottom frame, a moving-out assembly is installed on the rotating assembly, an overturning assembly is installed on the rotating assembly, a sound making assembly is installed on the rotating assembly, and a positioning assembly is installed on the rotating assembly. According to the device, a worker can conveniently take down a microphone on the sounder and place the microphone, placement and taking down are convenient, and a clamping ball is arranged to be connected with a clamping groove in a clamped mode, so that the rotated sound insulation plate can be conveniently limited.

Description

Automatic microphone quality testing equipment and methods Technical Field

[0001] This invention relates to automatic testing equipment, and in particular to automatic microphone quality testing equipment and methods, belonging to the field of microphone quality testing technology. Background Technology

[0002] A microphone, also known as a transducer or microphone, is an energy conversion device that converts sound signals into electrical signals. Microphones are classified into dynamic, condenser, electret, and the recently emerging silicon micro-microphones, as well as liquid microphones and laser microphones. Most microphones are electret condenser microphones, which work by using a polymer diaphragm with permanent charge isolation. Microphones require automated testing equipment for quality inspection.

[0003] However, existing automatic microphone quality testing equipment requires staff to insert the microphone into the testing port inside the soundproof box during actual use. Since the internal space of the soundproof box is relatively small, it is inconvenient for staff to operate, resulting in inconvenience in operation. Summary of the Invention

[0004] The main purpose of this invention is to solve the problem of inconvenient operation by providing an automatic microphone quality detection device and detection method.

[0005] The objective of this invention can be achieved by adopting the following technical solution:

[0006] An automatic microphone quality testing device and method includes a base plate and a frame mounted on the base plate. A worktable is mounted on the frame, a moving component is mounted on the worktable, a rotating component is mounted on the moving component, a testing component is mounted on the base plate, a rotating component is mounted on the frame, a removal component is mounted on the rotating component, a flipping component is mounted on the rotating component, a sound output component is mounted on the rotating component, and a positioning component is mounted on the rotating component.

[0007] Preferably, the moving component includes a guide rod, a guide ring, a first connecting rod, and a first connecting frame. The guide rod is mounted on the worktable, the guide ring is slidably mounted on the guide rod, the first connecting rod is mounted on the guide ring, and the first connecting frame is mounted on the first connecting rod.

[0008] Preferably, the detection assembly includes a soundproof box, side columns, a top plate, a first sound insulation cotton, and a detector. The side columns are installed on the workbench, the soundproof box is installed on the side columns, the top plate is installed on the soundproof box, the first sound insulation cotton is installed on the soundproof box, and the detector is installed on the top plate.

[0009] Preferably, the rotating assembly includes a motor, an outer frame, and a support frame. The support frame is installed on both the worktable and the base frame. One end of the support frame is connected to the outer frame, and the motor is installed on the outer frame.

[0010] Preferably, the removal assembly includes a rotating rod, a first gear, a first rack, a second connecting rod, a second connecting frame, and a support plate. The second connecting rod is installed at the bottom of the first connecting frame, and the first rack is installed on the second connecting rod. The rotating rod is installed at the output end of the motor, and the first gear, which meshes with the first rack, is installed on the rotating rod. The second connecting frame is installed on the base plate, and the support plate is installed on the second connecting frame. The rotating rod is rotatably connected to the support plate.

[0011] Preferably, the rotating assembly includes a sound insulation plate, a rotating block, a rotating column, and a second sound insulation cotton. The rotating column is rotatably mounted on the first connecting frame, the rotating block is mounted on the rotating column, a sound insulation plate is mounted on one end of the rotating column, and a second sound insulation cotton is mounted on the sound insulation plate.

[0012] Preferably, the flipping assembly includes a second gear, a second rack, and a support rod. The second gear is mounted on the rotating column, and the support rod is mounted on the worktable. One end of the support rod is equipped with a second rack that cooperates with the second gear.

[0013] Preferably, the sound-emitting assembly includes a connecting column, a sound generator, a support frame, a base, and a detection plug. The connecting column is installed on the sound insulation plate, the sound generator is installed on the connecting column, the base is installed on the sound generator, the support frame is installed on the base, and the detection plug is installed on the sound generator.

[0014] Preferably, the positioning component includes a retaining ball, a spring, and a cavity. The rotating block has a cavity, a spring is installed in the cavity, a retaining ball is installed at one end of the spring, and the first connecting frame has multiple slots that cooperate with the retaining ball.

[0015] The detection method of the automatic microphone quality detection equipment includes the following steps:

[0016] Step 1: The staff plugs the microphone into the sound generator and inserts the test plug into the microphone;

[0017] Step 2: The motor starts and drives the rotating rod to rotate. When the rotating rod rotates, it drives the first gear to rotate. When the first gear rotates, it drives the first rack to move. When the first rack moves, it drives the second connecting rod to move, which in turn drives the first connecting frame to move. At this time, since the second gear and the second rack are meshed, the first connecting frame moves. The rotation of the second gear drives the rotating column to rotate. When the rotating column rotates, it drives the sound insulation plate to rotate, which in turn drives the sound generator to rotate, pointing the sound generator towards the sound insulation box. When the rotating column rotates, it drives the rotating block to rotate. At this time, the first connecting frame squeezes the retaining ball, the spring shortens, and the spring rotates out of one slot and into another slot, thus limiting the rotation of the sound insulation plate.

[0018] Step 3: At this point, the first rack continues to move, which in turn moves the soundproofing plate, moving the microphone into the soundproof box. The sound generator is activated, causing the microphone to emit sound, and the detector detects the sound from the microphone.

[0019] Beneficial technical effects of the present invention:

[0020] According to the automatic microphone quality detection device and method of the present invention, the motor starts and drives the rotating rod to rotate. When the rotating rod rotates, it drives the first gear to rotate. When the first gear rotates, it drives the first rack to move. When the first rack moves, it drives the second connecting rod to move, which in turn drives the first connecting frame to move. When the second gear meshes with the second rack, the first rack continues to move. Because the second gear meshes with the second rack, the second gear rotates during the movement of the first connecting frame, which in turn drives the rotating column to rotate. When the rotating column rotates, it drives the sound insulation plate to rotate, which in turn drives the microphone to rotate, so that the microphone is facing the staff. This makes it easy for the staff to remove the microphone from the microphone and place the microphone. The placement and removal are relatively convenient. By setting a locking ball and a locking slot to engage, it is easy to limit the rotation of the sound insulation plate.

[0021] 2. When the motor starts, it drives the rotating rod to rotate. When the rotating rod rotates, it drives the first gear to rotate. When the first gear rotates, it drives the first rack to move. When the first rack moves, it drives the second connecting rod to move, which in turn drives the first connecting frame to move. At this time, because the second gear and the second rack are meshed, the first connecting frame moves. The rotation of the second gear drives the rotating column to rotate. When the rotating column rotates, it drives the sound insulation plate to rotate, which in turn drives the microphone to rotate, pointing the microphone toward the soundproof box. When the rotating column rotates, it drives the rotating block to rotate. At this time, the first connecting frame squeezes the retaining ball, the spring shortens, and the spring rotates out of one slot and into another slot, thus limiting the rotation of the sound insulation plate. At this time, the first rack continues to move, which drives the sound insulation plate to move, moving the microphone into the soundproof box. The microphone starts and makes the microphone produce sound. The detector detects the sound of the microphone, thus enabling quality detection of the microphone. Attached Figure Description

[0022] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 is a schematic diagram of the second gear structure of the present invention;

[0024] Figure 3 is a schematic diagram of the first rack structure of the present invention;

[0025] Figure 4 is a schematic diagram of the sound insulation panel structure of the present invention;

[0026] Figure 5 is a schematic diagram of the sound generator structure of the present invention;

[0027] Figure 6 is a schematic diagram of the connecting frame structure of the present invention;

[0028] Figure 7 is a schematic diagram of the ball-locking structure of the present invention;

[0029] Figure 8 is a schematic diagram of the support frame structure of the present invention;

[0030] Figure 9 is a schematic diagram of the spring structure of the present invention;

[0031] Figure 10 is a schematic diagram of the soundproof box structure of the present invention;

[0032] Figure 11 is a schematic diagram of the second rack structure of the present invention.

[0033] In the diagram: 1. Base plate; 11. Base frame; 12. Workbench; 2. Guide rod; 21. Guide ring; 22. First connecting rod; 23. First connecting frame; 3. Soundproof box; 31. Side column; 32. Top plate; 33. First sound insulation cotton; 34. Detector; 4. Sound insulation board; 41. Rotating block; 42. Rotating column; 43. Second sound insulation cotton; 5. Motor; 51. Outer frame; 52. Support frame; 6. Rotating rod; 61. First gear; 62. First rack; 63. Second connecting rod; 64. Second connecting frame; 65. Support plate; 7. Second gear; 71. Second rack; 72. Support rod; 8. Connecting column; 81. Sound generator; 82. Support frame; 83. Foot; 84. Detection plug; 9. Ball clamp; 91. Spring; 92. Cavity. Detailed Implementation

[0034] To enable those skilled in the art to understand the technical solution of the present invention more clearly, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0035] As shown in Figures 1-11, the automatic microphone quality detection device and method provided in this embodiment include a base plate 1 and a base frame 11 mounted on the base plate 1. A worktable 12 is mounted on the base frame 11, a moving component is mounted on the worktable 12, a rotating component is mounted on the moving component, a detection component is mounted on the base plate 1, a rotating component is mounted on the base frame 11, a removal component is mounted on the rotating component, a flipping component is mounted on the rotating component, a sound output component is mounted on the rotating component, and a positioning component is mounted on the rotating component. By setting the base plate 1 and the base frame 11 to cooperate with each other, the worktable 12 can be easily supported. By setting the base plate 1, the base frame 11, and the worktable 12 to cooperate with each other, the guide rod 2 can be easily supported. The moving component includes a guide rod. 2. Guide ring 21, first connecting rod 22, and first connecting frame 23: A guide rod 2 is installed on the worktable 12, a guide ring 21 is slidably installed on the guide rod 2, a first connecting rod 22 is installed on the guide ring 21, and a first connecting frame 23 is installed on the first connecting rod 22. By setting the guide ring 21 to slide and connect the guide rod 2, it is easy to guide and limit the first connecting frame 23. By setting the first connecting frame 23, it is easy to support the sound insulation panel 4. The rotating assembly includes a motor 5, an outer frame 51, and a support frame 52. Support frames 52 are installed on both the worktable 12 and the base frame 11. One end of the support frame 52 is connected to the outer frame 51, and the motor 5 is installed on the outer frame 51. By setting the outer frame 51 and the support frame 52 to cooperate with each other, it is easy to guide and limit the motor. The support and removal assembly includes a rotating rod 6, a first gear 61, a first rack 62, a second connecting rod 63, a second connecting frame 64, and a support plate 65. The second connecting rod 63 is mounted on the bottom of the first connecting frame 23, and the first rack 62 is mounted on the second connecting rod 63. The rotating rod 6 is mounted at the output end of the motor 5, and the first gear 61, which meshes with the first rack 62, is mounted on the rotating rod 6. The second connecting frame 64 is mounted on the base plate 1, and the support plate 65 is mounted on the second connecting frame 64. The rotating rod 6 and the support plate 65 are rotatably connected. By setting the second connecting frame 64 and the support plate 65 to cooperate, the rotating rod 6 can be easily supported. By setting the second connecting rod 63, the first rack 62 can be easily supported. The rotating assembly includes a sound insulation plate 4. The components include a rotating block 41, a rotating column 42, and a second sound-insulating cotton 43. The rotating column 42 is rotatably mounted on the first connecting frame 23, and the rotating block 41 is mounted on the rotating column 42. A sound-insulating plate 4 is mounted on one end of the rotating column 42, and the second sound-insulating cotton 43 is mounted on the sound-insulating plate 4. The flipping assembly includes a second gear 7, a second rack 71, and a support rod 72. The second gear 7 is mounted on the rotating column 42, and the support rod 72 is mounted on the worktable 12. A second rack 71 that meshes with the second gear 7 is mounted on one end of the support rod 72. The support rod 72 facilitates the support of the second rack 71. The positioning assembly includes a retaining ball 9, a spring 91, and a cavity 92. The rotating block 41 has a cavity 92, and a spring 91 is mounted on the cavity 92. A retaining ball 9 is mounted on one end of the spring 91.The first connecting frame 23 has multiple slots that engage with the locking ball 9. When the motor 5 starts, it drives the rotating rod 6 to rotate. The rotation of the rotating rod 6 drives the first gear 61 to rotate, which in turn drives the first rack 62 to move. The movement of the first rack 62 drives the second connecting rod 63 to move, which in turn moves the first connecting frame 23. When the second gear 7 meshes with the second rack 71, the first rack 62 continues to move. Because the second gear 7 meshes with the second rack 71, during the movement of the first connecting frame 23, the rotation of the second gear 7 drives the rotating column 42 to rotate. The rotation of the rotating column 42 drives the sound insulation plate 4 to rotate, which in turn drives the microphone 81 to rotate, pointing the microphone 81 towards the worker. This makes it easy for the worker to remove and place the microphone. The locking ball 9 engages with the slots, which helps to limit the rotation of the sound insulation plate 4.

[0036] In this embodiment, as shown in Figures 1, 7, 8, 10, and 11, the detection assembly includes a soundproof box 3, side columns 31, a top plate 32, first sound insulation cotton 33, and a detector 34. The side columns 31 are mounted on the workbench 12, the soundproof box 3 is mounted on the side columns 31, the top plate 32 is mounted on the soundproof box 3, the first sound insulation cotton 33 is mounted on the soundproof box 3, and the detector 34 is mounted on the top plate 32. The side columns 31 facilitate support for the soundproof box 3, and the motor 5, when started, drives the rotation... When lever 6 rotates, it drives the first gear 61 to rotate, which in turn drives the first rack 62 to move. The rack 62 then drives the second connecting rod 63 to move, which in turn drives the first connecting frame 23 to move. Since the second gear 7 meshes with the second rack 71, the first connecting frame 23 moves, causing the second gear 7 to rotate and drive the rotating column 42 to rotate. The rotating column 42 then drives the soundproofing plate 4 to rotate, which in turn drives the microphone 81 to rotate, pointing it towards the soundproofing box 3. The rotating column 42 also drives the rotating block 41 to rotate, causing the first connecting frame 23 to press against the retaining ball 9, shortening the spring 91 and moving it from one slot to another, thus limiting the rotation of the soundproofing plate 4. The first rack 62 continues to move, driving the soundproofing plate 4 to move, moving the microphone inside the soundproofing box 3. The microphone 81 is activated, and the detector 34 detects the microphone's sound, thus enabling the microphone to... The sound-emitting component includes a connecting column 8, a microphone 81, a support frame 82, a base 83, and a test plug 84. The connecting column 8 is installed on the sound insulation plate 4, the microphone 81 is installed on the connecting column 8, the base 83 is installed on the microphone 81, the support frame 82 is installed on the base 83, and the test plug 84 is installed on the microphone 81. By setting the connecting column 8, the microphone 81 can be easily supported. By setting the support frame 82 and the base 83, the microphone can be easily limited.

[0037] In this embodiment, as shown in Figures 1-11, the working process of the microphone quality automatic detection device and detection method provided in this embodiment is as follows:

[0038] Step 1: The staff inserts the microphone into the sound transmitter 81 and the test plug 84 into the microphone;

[0039] Step 2: The motor 5 starts and drives the rotating rod 6 to rotate. When the rotating rod 6 rotates, it drives the first gear 61 to rotate. When the first gear 61 rotates, it drives the first rack 62 to move. When the first rack 62 moves, it drives the second connecting rod 63 to move, which in turn drives the first connecting frame 23 to move. At this time, since the second gear 7 is meshed with the second rack 71, the first connecting frame 23 moves. The second gear 7 rotates and drives the rotating column 42 to rotate. When the rotating column 42 rotates, it drives the sound insulation plate 4 to rotate, which in turn drives the sound generator 81 to rotate, so that the sound generator 81 is facing the sound insulation box 3. When the rotating column 42 rotates, it drives the rotating block 41 to rotate. At this time, the first connecting frame 23 squeezes the retaining ball 9, and the spring 91 shortens. The spring 91 is rotated out of one slot and inserted into another slot, thus limiting the rotation of the sound insulation plate 4.

[0040] Step 3: At this time, the first rack 62 continues to move, which in turn drives the soundproof plate 4 to move, moving the microphone into the soundproof box 3. The sound generator 81 is activated to make the microphone emit sound, and the detector 34 detects the sound of the microphone.

[0041] In summary, in this embodiment, the microphone quality automatic detection equipment and method, by setting the base plate 1 and the base frame 11 to cooperate with each other, facilitates the support of the workbench 12; by setting the base plate 1, the base frame 11 and the workbench 12 to cooperate with each other, facilitates the support of the guide rod 2; by setting the guide ring 21 to slide and connect with the guide rod 2, facilitates the guiding and limiting of the first connecting frame 23; by setting the first connecting frame 23, facilitates the support of the sound insulation plate 4; by setting the outer frame 51 and the support frame 52 to cooperate with each other, facilitates the support of the motor 5; by setting the second connecting frame 64 and the support plate 65 to cooperate with each other, facilitates the support of the rotating rod 6; and by setting the second connecting rod 63, facilitates the support of the rotating rod 6. To facilitate support of the first rack 62, a support rod 72 is provided to facilitate support of the second rack 71. When the motor 5 starts, it drives the rotating rod 6 to rotate. The rotation of the rotating rod 6 drives the first gear 61 to rotate, which in turn drives the first rack 62 to move. The movement of the first rack 62 drives the second connecting rod 63 to move, which in turn drives the first connecting frame 23 to move. When the second gear 7 meshes with the second rack 71, the first rack 62 continues to move. Because the second gear 7 meshes with the second rack 71, the rotation of the second gear 7 during the movement of the first connecting frame 23 drives the rotating column 42 to rotate. The rotation of the rotating column 42 drives the sound insulation plate 4 to rotate, which in turn drives the sound generator 81 to rotate, pointing the sound generator 81 towards the workers. The design facilitates easy removal and placement of the microphone from the sound generator 81 by staff. The locking ball 9 engages with the slot, limiting the rotation of the soundproof panel 4. The side column 31 provides support for the soundproof box 3. The motor 5, when started, drives the rotating rod 6 to rotate. This rotation drives the first gear 61, which in turn moves the first rack 62. The rack 62 then moves the second connecting rod 63, which in turn moves the first connecting frame 23. During this movement, the second gear 7 meshes with the second rack 71, causing the first connecting frame 23 to move. The rotation of the second gear 7 further drives the rotating column 42 to rotate. The rotation of the rotating column 42 then... The soundproof panel 4 rotates, which in turn drives the microphone 81 to rotate, pointing the microphone 81 toward the soundproof box 3. When the rotating column 42 rotates, it drives the rotating block 41 to rotate. At this time, the first connecting bracket 23 squeezes the retaining ball 9, and the spring 91 shortens, rotating the spring 91 out of one slot and into another slot, thereby limiting the rotation of the soundproof panel 4. At this time, the first rack 62 continues to move, thereby driving the soundproof panel 4 to move and moving the microphone into the soundproof box 3. The microphone 81 is activated to make the microphone emit sound. The detector 34 detects the sound of the microphone, thereby enabling quality detection of the microphone. By setting the connecting column 8, it is easy to support the microphone 81. By setting the support frame 82 and the base 83, it is easy to limit the microphone.

[0042] The above description is merely a further embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope disclosed in the present invention, based on the technical solution and concept of the present invention, shall fall within the scope of protection of the present invention.

Claims

1. An automatic microphone quality detection device, characterized in that, Includes a base plate (1) and a base frame (11) mounted on the base plate (1). A worktable (12) is mounted on the base frame (11). A moving component is mounted on the worktable (12). A rotating component is mounted on the moving component. A detection component is mounted on the base plate (1). A rotating component is mounted on the base frame (11). A removal component is mounted on the rotating component. A flipping component is mounted on the rotating component. A sound-emitting component is mounted on the rotating component. A positioning component is mounted on the rotating component.

2. The automatic microphone quality detection device according to claim 1, characterized in that, The moving component includes a guide rod (2), a guide ring (21), a first connecting rod (22) and a first connecting frame (23). The guide rod (2) is installed on the worktable (12). The guide ring (21) is slidably installed on the guide rod (2). The first connecting rod (22) is installed on the guide ring (21). The first connecting frame (23) is installed on the first connecting rod (22).

3. The automatic microphone quality detection device according to claim 2, characterized in that, The detection assembly includes a soundproof box (3), side columns (31), a top plate (32), a first sound insulation cotton (33), and a detector (34). The workbench (12) is equipped with a side column (31), the side column (31) is equipped with a soundproof box (3), the soundproof box (3) is equipped with a top plate (32), the soundproof box (3) is equipped with a first sound insulation cotton (33), and the top plate (32) is equipped with a detector (34).

4. The automatic microphone quality detection device according to claim 3, characterized in that, The rotating assembly includes a motor (5), an outer frame (51) and a support frame (52). The support frame (52) is installed on both the worktable (12) and the base frame (11). One end of the support frame (52) is connected to the outer frame (51), and the motor (5) is installed on the outer frame (51).

5. The automatic microphone quality detection device according to claim 4, characterized in that, The removal assembly includes a rotating rod (6), a first gear (61), a first rack (62), a second connecting rod (63), a second connecting frame (64), and a support plate (65). The second connecting rod (63) is installed at the bottom of the first connecting frame (23), and the first rack (62) is installed on the second connecting rod (63). The rotating rod (6) is installed at the output end of the motor (5), and the first gear (61) meshes with the first rack (62) on the rotating rod (6). The second connecting frame (64) is installed on the base plate (1), and the support plate (65) is installed on the second connecting frame (64). The rotating rod (6) is rotatably connected to the support plate (65).

6. The automatic microphone quality detection device according to claim 5, characterized in that, The rotating assembly includes a sound insulation plate (4), a rotating block (41), a rotating column (42), and a second sound insulation cotton (43). The rotating column (42) is rotatably mounted on the first connecting frame (23). The rotating block (41) is mounted on the rotating column (42). The sound insulation plate (4) is mounted on one end of the rotating column (42). The second sound insulation cotton (43) is mounted on the sound insulation plate (4).

7. The automatic microphone quality detection device according to claim 6, characterized in that, The flipping assembly includes a second gear (7), a second rack (71) and a support rod (72). The second gear (7) is mounted on the rotating column (42), and the support rod (72) is mounted on the worktable (12). One end of the support rod (72) is equipped with a second rack (71) that cooperates with the second gear (7).

8. The automatic microphone quality detection device according to claim 7, characterized in that, The sound-emitting assembly includes a connecting post (8), a sound generator (81), a support frame (82), a base (83), and a detection plug (84). The connecting post (8) is installed on the sound insulation plate (4), the sound generator (81) is installed on the connecting post (8), the base (83) is installed on the sound generator (81), the support frame (82) is installed on the base (83), and the detection plug (84) is installed on the sound generator (81).

9. The automatic microphone quality detection device according to claim 8, characterized in that, The positioning component includes a ball (9), a spring (91) and a cavity (92). The rotating block (41) has a cavity (92), and a spring (91) is installed on the cavity (92). A ball (9) is installed on one end of the spring (91). The first connecting frame (23) has multiple slots that cooperate with the ball (9).

10. The detection method of the automatic microphone quality detection device according to claims 1-9, characterized in that, The steps include: Step 1: The staff inserts the microphone into the sound generator (81) and inserts the test plug (84) into the microphone; Step 2: The motor (5) starts and drives the rotating rod (6) to rotate. When the rotating rod (6) rotates, it drives the first gear (61) to rotate. When the first gear (61) rotates, it drives the first rack (62) to move. When the first rack (62) moves, it drives the second connecting rod (63) to move, which in turn drives the first connecting frame (23) to move. At this time, since the second gear (7) meshes with the second rack (71), the second gear (7) rotates during the movement of the first connecting frame (23), which in turn drives the rotating column (42) to rotate. When the soundproof plate (4) rotates, it drives the soundproof plate (4) to rotate, which in turn drives the sound generator (81) to rotate. The sound generator (81) is directed toward the soundproof box (3). When the rotating column (42) rotates, it drives the rotating block (41) to rotate. At this time, the first connecting frame (23) squeezes the ball (9), and the spring (91) shortens. The spring (91) is rotated out of one slot and inserted into another slot, which limits the rotation of the soundproof plate (4). Step 3: At this time, the first rack (62) continues to move, which drives the soundproof plate (4) to move. The microphone is moved into the soundproof box (3). The sound generator (81) is activated to make the microphone emit sound. The detector (34) detects the sound of the microphone.

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