Handheld strong sound shield detection mechanism

Abstract

The utility model belongs to the field of standard detection, and discloses a hand-held strong sound shield detection mechanism, which comprises a hand-held strong sound shield, a shield setting unit, a far-end microphone, a near-end microphone and a laser assembly, a plurality of surfaces of the hand-held strong sound shield are marked with central points, the shield setting unit is used for vertically setting the hand-held strong sound shield, and the far-end microphone and the near-end microphone are arranged on the laser assembly. The far-end microphone is used for carrying out far-end detection on the handheld intense sound shield, the near-end microphone is used for carrying out near-end detection on the handheld intense sound shield, the laser assembly comprises a first laser transmitter, a second laser transmitter and a third laser transmitter, the first laser transmitter is arranged at the rotating center of the basic rotary table, and the transmitting direction of the first laser transmitter is vertically upward; the second laser transmitter and the third laser transmitter are arranged at the receiving ends of the far-end microphone and the near-end microphone respectively and face the handheld intense sound shield.

Description

Technical Field

[0001] The utility model belongs to the field of standard detection, and in particular relates to a handheld strong sound shield detection mechanism. Background Art

[0002] Handheld directional high-intensity sound shields are mainly used in national defense and security, for the purpose of "target dispersal" or "active defense." They are usually made in the shape of ordinary shields of various shapes and specifications, and are held by the user's arm. The shield has a strong sound source inside, with a front facing outward and a back facing the user. When the shield is aimed at the target, the A-weighted sound pressure level at the target can reach above 100dB. The requirement is to achieve the purpose of dispersal without causing irreversible damage to the target. The product requirements of handheld high-intensity sound shields are high sound efficiency and concentrated energy. The sound should have less impact on areas outside the target, especially on the user facing the back of the shield. Therefore, a set of standard testing methods and testing devices are required for such products.

[0003] At present, the closest products both internationally and domestically are strong sound sources that are not handheld by the user. The detection method is to fix the strong sound source in a free field space and set a far-end microphone at a distance at the same horizontal position as the strong sound source to measure the frequency response, effective frequency range, standard distance sound pressure level and sound power level index data of the strong sound source. Then, the strong sound source is rotated, and the index data of the directivity pattern is obtained during the rotation through a predetermined angle.

[0004] However, it is clear that these methods are only applicable to strong sound sources that are not held by the user. For strong sound shields held by the user, in actual use, the strong sound shield swings in a vertical plane parallel to the user's frontal plane due to the swinging of the user's arm. Therefore, the strong sound shield is often not upright. If the target person is assumed to be standing upright, there will often be a swing deviation relative to the target person. Therefore, if the above method is still used to test the strong sound shield, it is impossible to accurately obtain the corresponding indicator data of the strong sound shield. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the present invention provides a handheld sound shield detection mechanism, which can fully simulate the influence of the user's arm swing on the detection, thereby accurately obtaining the corresponding index data of the sound shield.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] The handheld strong sound shield detection mechanism is used to detect the handheld strong sound shield in a free field space with a horizontal working reference surface. The mechanism is characterized by comprising: a handheld strong sound shield with center points marked on the front and back sides, and a marking point vertically corresponding to the center point marked on the lower end side; a shield setting unit for uprightly setting the handheld strong sound shield, comprising a basic turntable, a mobile base, a motor mounting seat, and a swing-driving motor, wherein the output shaft of the swing-driving motor is connected to the back side of the handheld strong sound shield; a far-end microphone for performing far-end detection of the handheld strong sound shield along the horizontal detection direction, and during detection, the far-end microphone is directed toward the front side of the handheld strong sound shield; and a near-end microphone for performing near-end detection of the handheld strong sound shield along the horizontal detection direction, and during detection, the near-end microphone is directed toward the On the back, the laser assembly includes a first laser emitter, a second laser emitter, and a third laser emitter, wherein the basic turntable is fixed on the working reference plane, the mobile base is fixed on the basic turntable, the motor mounting base is movably arranged on the mobile base along the horizontal detection direction, the swing drive motor is coupled to the motor mounting base, and the extension direction of the output shaft of the swing drive motor is parallel to the horizontal detection direction, the first laser emitter is arranged at the center of rotation of the basic turntable, and the emission direction of the first laser emitter is vertically upward; the second laser emitter is arranged at the receiving end of the far-end microphone, and the emission direction of the second laser emitter is along the horizontal detection direction toward the handheld strong sound shield; the third laser emitter is arranged at the receiving end of the near-end microphone, and the emission direction of the third laser emitter is along the horizontal detection direction toward the back of the handheld strong sound shield.

[0008] Preferably, the distance between the remote microphone and the handheld strong sound shield is 5 to 10 meters, the rotation range of the basic turntable is -90° to 90° with the horizontal detection direction as the 0 point, and the rotation range of the output shaft of the drive motor is -90° to 90° with the horizontal detection direction as the 0 point.

[0009] Furthermore, the present invention also includes an encoder, which is connected to the swing-driving motor signal and can accurately control the rotation angle of the output shaft of the swing-driving motor.

[0010] Preferably, the movable base includes a movable guide rail, a driving screw, a driving slide and a driving handwheel. The movable guide rail and the driving screw are both extended in a direction parallel to the horizontal detection direction. The driving slide and the driving screw are threadedly connected, and the driving slide cooperates with the movable guide rail through a guide shoe. The motor mounting seat is fixed on the driving slide through a bracket.

[0011] Furthermore, the utility model also includes a motor moving component, including a component base, and a lifting guide rail, a lifting screw, a lifting slide and a lifting handwheel all arranged on the component base. The component base is arranged on the motor mounting seat, the lifting guide rail and the lifting screw are both extended in the vertical direction, the lifting slide and the lifting screw are threadedly connected, and the lifting slide cooperates with the lifting guide rail through a guide shoe, and the swing drive motor is fixed on the lifting slide.

[0012] Preferably, the present invention further comprises two liftable brackets for respectively lifting and placing the handheld strong sound shield and the near-end microphone during the near-end detection process.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. The handheld strong sound shield detection mechanism of the present invention includes a handheld strong sound shield, a shield setting unit, a far-end microphone, a near-end microphone and a laser assembly. The center point is marked on the surface of the handheld strong sound shield. The shield setting unit includes a basic turntable, a movable base, a motor mounting base and a swing-driving motor. The far-end microphone is used to perform far-end detection of the handheld strong sound shield, and the near-end microphone is used to perform near-end detection of the handheld strong sound shield. The laser assembly includes a first laser emitter, a second laser emitter and a third laser emitter. The movable base is fixed on the basic turntable, the motor mounting base is movably set on the movable base, the swing-driving motor is coupled to the motor mounting base, and the extension direction of the output shaft of the swing-driving motor is parallel to the horizontal detection direction. The first laser emitter is set at the center of rotation of the basic turntable, and the emission direction is vertically upward; the second laser emitter and the third laser emitter are respectively set at the far-end The receiving ends of the microphone and the proximal microphone are both directed toward the handheld intense sound shield. The handheld intense sound shield is turned on and the base turntable is rotated by a predetermined horizontal angle. The handheld intense sound shield is tested by the distal microphone. The output shaft of the swing motor is arranged horizontally, causing the handheld intense sound shield to swing to a corresponding angle in a vertical plane parallel to the user's coronal plane. After the distal test is completed, the motor mounting base is removed from the base turntable, and the handheld intense sound shield and the proximal microphone are separately installed, with the proximal microphone facing the back of the handheld intense sound shield in a horizontal testing direction. Therefore, the present invention can fully simulate the effect of the user's arm swing on the test, thereby accurately obtaining corresponding indicator data of the intense sound shield under this premise. In addition to simulating the sound impact of the handheld intense sound shield on the target person through distal testing, the present invention also adds proximal testing to simulate the sound impact of the handheld intense sound shield on the user.

[0015] 2. Because the present invention also includes an encoder connected to the swing drive motor signal, it can accurately control the rotation angle of the swing drive motor output shaft. Therefore, the present invention can accurately control the rotation angle of the swing drive motor output shaft, that is, it can simulate the swing of the handheld sound shield relative to the user's coronal plane, thereby making the detection data closer to the actual value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a layout for implementing remote detection according to an embodiment of the present invention;

[0017] Figure 2 A schematic diagram of a layout for implementing near-end detection according to an embodiment of the present invention;

[0018] Figure 3 This is a schematic structural diagram of a shield setting unit and a motor moving assembly according to an embodiment of the present utility model;

[0019] Figure 4 This is a structural diagram of a mobile base according to an embodiment of the present utility model;

[0020] Figure 5 This is a structural diagram of a motor moving assembly according to an embodiment of the present utility model.

[0021] In the figure: R, free field space, P, working reference plane, D, horizontal detection direction, S, handheld strong sound shield, 10, shield setting unit, 11, basic turntable, 111, compensation counterweight, 12, moving base, 121, moving guide rail, 122, driving slide, 123, driving handwheel, 13, motor mounting base, 14, driving swing motor, 141, bracket part, 20, motor moving component, 21, component base, 22, lifting guide rail, 23, lifting slide, 24, lifting handwheel, M1, far-end microphone, M2, near-end microphone. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the following embodiments are combined with the accompanying drawings to specifically illustrate the handheld sound shield detection mechanism of the present invention. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0023] like Figure 1 and Figure 2As shown, the handheld strong sound shield detection mechanism 100 is used to detect the handheld strong sound shield S in a free field space R. The free field space R has a horizontal working reference surface P. It includes the handheld strong sound shield S, a far-end microphone M1, a near-end microphone M2, a liftable bracket (not shown in the drawings), a shield setting unit 10, an encoder (not shown in the drawings), a motor moving assembly 20, and a laser assembly.

[0024] The front and back of the handheld sound shield S are marked with a center point (not shown in the drawings), and the lower end surface is marked with a marking point vertically corresponding to the center point. Specifically, the center point is the geometric center point. The front and back of the handheld sound shield S are marked with marking points corresponding to the horizontal detection direction D, and the bottom surface is marked with a marking point corresponding to the horizontal detection direction D.

[0025] The remote microphone M1 is used to perform remote detection of the handheld sound shield S. During detection, the remote microphone M1 is directed toward the front of the handheld sound shield S along the horizontal detection direction D, and the distance between the remote microphone M1 and the handheld sound shield S is 5 to 10 meters.

[0026] The near-end microphone M2 is used to perform near-end detection of the handheld sound shield S. During detection, the near-end microphone M2 is directed toward the back of the handheld sound shield S along a horizontal detection direction D. In this embodiment, the near-end microphone M2 is disposed on a simulated human body (not shown in the drawings), with the simulated human body directed toward the back of the handheld sound shield S.

[0027] There are two liftable brackets, which are used to respectively lift the handheld strong sound shield and the near-end microphone during the near-end detection process. Specifically, the liftable brackets are two-end sleeve structures that are retractable in the vertical direction.

[0028] The shield setting unit 10 is used to set the handheld strong sound shield S upright. The shield setting unit 10 includes a basic turntable 11, a moving base 12, a motor mounting base 13 and a swing-driving motor 14. The output shaft of the swing-driving motor 14 is connected to the back of the handheld strong sound shield S.

[0029] like Figure 3As shown, the basic turntable 11 is fixed on the working reference plane P, and the rotation range of the basic turntable 11 is -90° to 90° with the horizontal detection direction D as the 0 point, and the mobile base 12 is fixed on the basic turntable 11. Specifically, a corresponding motor (not shown in the drawings) is provided at the bottom of the basic turntable 11. The motor has a motor output shaft (not shown in the drawings) that is vertically upward and passes through the basic turntable 11, so that the basic turntable 11 can rotate horizontally. In this embodiment, the center of gravity of the mobile base 12 does not correspond to the center of gravity of the basic turntable 11 in the vertical direction. Therefore, the basic turntable 11 also has a compensating counterweight 111. The compensating counterweight 111 is used to compensate for the imbalance of the center of gravity caused by the total weight of the mobile base 12 and the components thereon.

[0030] like Figure 4 As shown, the movable base 12 includes a movable guide rail 121 , a driving screw (not shown in the drawings), a driving slide 122 and a driving hand wheel 123 .

[0031] The movable guide rail 121 and the driving screw are both extended in a direction parallel to the horizontal detection direction D. The driving slide 122 is threadedly connected to the driving screw, and the driving slide 122 cooperates with the movable guide rail through a guide shoe. The motor mounting seat 13 is fixed on the driving slide 122 through a bracket, and the driving handwheel 123 is connected to the end of the driving screw. The user drives the driving screw to move by rotating the driving handwheel 123, thereby causing the motor mounting seat 13 to move horizontally relative to the base turntable 11.

[0032] The motor mounting base 13 is movably mounted on the movable base 12 along the horizontal detection direction D. The swing-driving motor 14 is coupled to the motor mounting base 13 , and the output shaft of the swing-driving motor 14 extends parallel to the horizontal detection direction D. Specifically, the free end of the output shaft of the swing-driving motor 14 has a bracket portion 141 for fixing the handheld sound shield S.

[0033] The encoder is connected to the swing motor 14 signal, and the encoder can accurately control the rotation angle of the output shaft of the swing motor 14, so that the rotation range of the output shaft of the swing motor 14 is accurately limited to -90° to 90° with the horizontal detection direction as the 0 point.

[0034] like Figure 5 As shown, the motor moving assembly 20 includes an assembly base 21, and a lifting guide rail 22, a lifting screw (not shown in the drawings), a lifting slide 23 and a lifting handwheel 24, all of which are arranged on the assembly base 21. Specifically, the swing drive motor 14 is arranged on the motor mounting base 13 through the motor moving assembly 20.

[0035] The component base 21 is set on the motor mounting base 13, the lifting guide rail 22 and the lifting screw are both extended in the vertical direction, the lifting slide 23 and the lifting screw are threadedly connected, and the lifting slide 23 cooperates with the lifting guide rail 22 through the guide shoe, and the swing drive motor 14 is fixed on the lifting slide 23. Specifically, the component base 21 is vertically set on the top of the motor mounting base 13.

[0036] The laser assembly includes a first laser emitter (not shown in the drawings), a second laser emitter (not shown in the drawings), and a third laser emitter (not shown in the drawings).

[0037] The first laser emitter is disposed at the center of rotation of the base turntable 11, and the emission direction of the first laser emitter is vertically upward; the second laser emitter is disposed at the receiving end of the distal microphone M1, and the emission direction of the second laser emitter is along the horizontal detection direction D toward the front of the handheld sound shield S; the third laser emitter is disposed at the receiving end of the proximal microphone M2, and the emission direction of the third laser emitter is along the horizontal detection direction D toward the back of the handheld sound shield S.

[0038] In this embodiment, the handheld strong sound shield detection method is implemented by the handheld strong sound shield detection mechanism 100 to achieve far-end testing and near-end testing of the handheld strong sound shield S.

[0039] The handheld sound shield detection method includes the following steps:

[0040] First, a horizontally rotatable basic turntable 11 is set on the working reference plane P, and a motor mounting seat 13 is set on the basic turntable 11.

[0041] Specifically, the base turntable 11 is driven to rotate by a motor.

[0042] Then, the sway driving motor 14 is coupled to the motor mounting base 13 so that the output shaft of the sway driving motor 14 extends horizontally.

[0043] Then, the handheld strong sound shield S is placed on the output shaft of the swing driving motor 14 so that the center point of the handheld strong sound shield S is vertically aligned with the rotation center of the basic turntable 11 .

[0044] Specifically, the swing motor 14 can drive the handheld powerful sound shield S to rotate in a vertical plane, which simulates the action of the user swinging his arms parallel to his own coronal plane, thereby driving the handheld powerful sound shield S.

[0045] The motor mounting base 13 is movable relative to the base turntable 11 in the horizontal detection direction. A first laser emitter radiating vertically upward is provided at the rotation center of the base turntable 11. The motor mounting base 13 is moved relative to the base turntable 11 so that the illumination point of the first laser emitter on the shield S to be tested coincides with the center point.

[0046] Specifically, the output end of the swing-driving motor 14 needs to be coupled to a variety of handheld powerful sound shields S of different sizes and specifications. Replacement of handheld powerful sound shields S of different specifications would cause the rotation centers of the handheld powerful sound shields S and the base turntable 11 to be misaligned in the vertical direction. This misalignment would affect the accuracy of subsequent measurement data. Therefore, the motor mounting base 13 is moved relative to the base turntable 11 in the horizontal detection direction, thereby ensuring that the rotation centers of the handheld powerful sound shields S and the base turntable 11 remain aligned in the vertical direction after replacement of handheld powerful sound shields S of different specifications.

[0047] Then, a remote microphone M1 is vertically arranged on the working reference plane P so as to be movable upward and downward. The remote microphone M1 corresponds to the handheld strong sound shield S along the horizontal detection direction D, and the horizontal detection direction D is parallel to the output shaft of the swing driving motor 14 .

[0048] Next, a first laser emitter emitting in the horizontal detection direction D is set on the remote microphone M1, and the remote microphone M1 is raised and lowered relative to the working surface so that the illumination point of the first laser emitter on the handheld sound shield S coincides with the center point.

[0049] Next, the handheld sound shield S is turned on and the base turntable is rotated to a predetermined angle, and the shield to be tested is detected by the remote microphone, that is, from -90° to 90° with the horizontal detection direction as the 0 point.

[0050] Specifically, the above steps are used to test the sound impact index data of the handheld strong sound shield S on the target person, which is called a remote test. The remote test process is as follows: first, the base turntable 11 is rotated 90 degrees in one direction, that is, the handheld strong sound shield S is rotated to -90 degrees in a horizontal plane with the horizontal detection direction as 0. Then, the handheld strong sound shield S is opened and emits strong sound waves until the base turntable 11 is rotated 90 degrees in the other direction, that is, the handheld strong sound shield S is rotated to 90 degrees in a horizontal plane with the horizontal detection direction D as -90 degrees. During this continuous rotation process, the strong sound waves are received by the remote microphone M1 (at this time, the remote microphone is facing the target person). The tester analyzes and records the strong sound waves to obtain the sound impact index data of the handheld strong sound shield S on the target person.

[0051] Next, the encoder is used to control the swing motor to rotate a predetermined unit angle, and the above two steps are repeated until the superposition of the angles of the swing motor 14 rotated is a predetermined vertical rotation angle, that is, -90° to 90° with the horizontal detection direction as the 0 point.

[0052] Specifically, the difference between the remote test process with the above step and the remote test process without the above step is that: the basic turntable 11 rotates multiple times, and each time it rotates, the swing motor 14 rotates a predetermined unit angle, so that the handheld strong sound shield S rotates a predetermined unit angle in the vertical plane. When the basic turntable rotates for the first time, the swing motor rotates the handheld strong sound shield in the vertical plane with the horizontal detection direction as 0 to -90°, and then the handheld strong sound shield S is opened to emit strong sound waves until the basic turntable 11 drives the handheld strong sound shield S to rotate in the horizontal plane with the horizontal detection direction as -90° to 90°. During this continuous rotation process, the remote microphone M is used to detect the sound waves. 1 receives an intense sound wave (at this point, the far-end microphone is pointing to the target person). The tester analyzes and records the intense sound wave to obtain data on the sound impact of the handheld intense sound shield S on the target person. During multiple rotations of the basic turntable 11, the handheld intense sound shield S rotates a certain angle in one direction within the vertical plane with each rotation, until the handheld intense sound shield S rotates from -90° to 90° within the vertical plane with the horizontal detection direction being -90°. In this way, the obtained data on the sound impact of the handheld intense sound shield S on the target person can reflect the sound impact of the handheld intense sound shield S on the target person caused by the user's various arm swing positions, which is more consistent with the objective conditions of actual use.

[0053] Next, the motor mounting base 13 is removed from the base turntable 11 , and the handheld strong sound shield S and the near-end microphone M2 are respectively installed via two liftable brackets, with the near-end microphone M2 facing the back of the handheld strong sound shield S along the horizontal detection direction D.

[0054] Next, a third laser emitter emitting in the horizontal detection direction is set on the near-end microphone M2 so that the illumination point of the third laser emitter on the handheld sound shield S coincides with the center point.

[0055] Finally, the handheld sound shield is turned on and the basic turntable 11 is rotated to a predetermined angle, and the handheld sound shield S is detected by the near-end microphone M2.

[0056] Specifically, the three steps described above are used to test the sound impact index data of the handheld sound shield on the user, which is called the near-end test. The near-end test process is as follows: the handheld sound shield S is directly turned on to emit a strong sound wave for a period of time. During this continuous rotation, the strong sound wave is received by the near-end microphone M2 (at this time, the near-end microphone corresponds to the user). The tester analyzes and records the strong sound wave to obtain the sound impact index data of the handheld sound shield S on the user.

[0057] Specifically, the handheld sound shield detection method uses two testing processes: near-end testing and far-end testing to obtain the sound impact index of the handheld sound shield S on the user and the sound impact index of the handheld sound shield S on the target person, respectively. This makes the standard testing of the handheld sound shield S more in line with actual application scenarios, that is, it can obtain more comprehensive, accurate and effective performance indicator data of the handheld sound shield.

[0058] The above-mentioned embodiments are preferred cases of the present invention and are not intended to limit the scope of protection of the present invention. Various deformations or modifications that can be made by ordinary technicians in this field without creative work within the scope of the attached claims are still within the scope of protection of this patent.

Claims

1. A handheld sound shield detection mechanism, used to detect a handheld sound shield in a free field space having a horizontal working reference surface, characterized in that: include: The handheld sound shield has a center point marked on the front and back, and a mark point vertically corresponding to the center point is marked on the lower end. The shield setting unit is used to set up the handheld strong sound shield upright, including a basic turntable, a mobile base, a motor mounting base and a swing-driving motor. The output shaft of the swing-driving motor is connected to the back of the handheld strong sound shield. The remote microphone is used to perform remote detection on the handheld strong sound shield along the horizontal detection direction, and during detection, the remote microphone faces the front of the handheld strong sound shield. The near-end microphone is used to perform near-end detection on the handheld strong sound shield along the horizontal detection direction, and during detection, the near-end microphone faces the back of the handheld strong sound shield. The laser assembly includes a first laser emitter, a second laser emitter, and a third laser emitter. The basic turntable is fixed on the working reference plane, the mobile base is fixed on the basic turntable, the motor mounting seat is movably arranged on the mobile base along the horizontal detection direction, the sway driving motor is coupled to the motor mounting seat, and the extension direction of the output shaft of the sway driving motor is parallel to the horizontal detection direction. The first laser emitter is arranged at the rotation center of the basic turntable, and the emission direction of the first laser emitter is vertically upward; the second laser emitter is arranged at the receiving end of the far-end microphone, and the emission direction of the second laser emitter is toward the handheld strong sound shield along the horizontal detection direction; the third laser emitter is arranged at the receiving end of the near-end microphone, and the emission direction of the third laser emitter is toward the back of the handheld strong sound shield along the horizontal detection direction.

2. The handheld sound shield detection mechanism according to claim 1, characterized in that: in, The distance between the remote microphone and the handheld strong sound shield is 5 to 10 meters. The rotation range of the basic turntable is -90° to 90° with the horizontal detection direction as the 0 point. The rotation range of the output shaft of the drive motor is -90° to 90° with the horizontal detection direction as the 0 point.

3. The handheld strong sound shield detection mechanism according to claim 2, characterized in that: Also includes: The encoder is connected to the swing driving motor signal and can accurately control the rotation angle of the output shaft of the swing driving motor.

4. The handheld sound shield detection mechanism according to claim 1, characterized in that: in, The movable base includes a movable guide rail, a driving screw, a driving slide and a driving hand wheel. The movable guide rail and the driving screw are both extended in a direction parallel to the horizontal detection direction, the driving slide and the driving screw are threadedly connected, and the driving slide cooperates with the movable guide rail through a guide shoe, and the motor mounting seat is fixed on the driving slide through a bracket.

5. The handheld strong sound shield detection mechanism according to claim 4, characterized in that: Also includes: The motor moving assembly includes an assembly base, and a lifting guide rail, a lifting screw, a lifting slide and a lifting handwheel all arranged on the assembly base. The component base is arranged on the motor mounting seat, the lifting guide rail and the lifting screw are both extended in the vertical direction, the lifting slide and the lifting screw are threadedly connected, and the lifting slide cooperates with the lifting guide rail through a guide shoe, and the swing drive motor is fixed on the lifting slide.

6. The handheld strong sound shield detection mechanism according to claim 1, characterized in that: Also includes: Two liftable brackets are used to respectively lift and place the handheld strong sound shield and the near-end microphone during the near-end detection process.

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