CN218776481U - Microphone experiment mounting fixture - Google Patents
Microphone experiment mounting fixture Download PDFInfo
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- CN218776481U CN218776481U CN202223342213.1U CN202223342213U CN218776481U CN 218776481 U CN218776481 U CN 218776481U CN 202223342213 U CN202223342213 U CN 202223342213U CN 218776481 U CN218776481 U CN 218776481U
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- centering disc
- microphone
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- limiting
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Abstract
The utility model belongs to the field of acoustic technology test, in particular to a microphone experiment fixing clamp; the device comprises a base, wherein a slideway is arranged on the base, scale marks are arranged on the side surface of the slideway, a vertical column in the vertical direction is arranged in the slideway in a sliding manner, and a centering clamping assembly is arranged on the vertical column; the base is provided with a front end positioning bracket; by the centering clamping device, the geometric center of the front end of the microphone is kept unchanged before and after the reference microphone and the tested microphone are replaced, so that the position error caused by repeated clamping and centering is reduced; through the setting of front end location bracket, play the support effect at the in-process that presss from both sides tightly, can fix a position the linear distance between microphone front end and the sound source simultaneously, further reduced the linear distance error.
Description
Technical Field
The utility model belongs to the technical test field of the acoustics, especially, relate to a microphone experiment mounting fixture.
Background
Free field comparison is a common method for testing the frequency response of microphones. The free field, that is, the free sound field, is an experiment performed in an anechoic room in an acoustic environment where a uniform medium is simulated and a space is infinitely wide.
In the calibration test of the free field comparison method, the geometric center of the sound source sounding surface and the geometric center of the front end of the microphone to be tested are required to be positioned on the same plane, so that the error in calibration is reduced. Firstly, a reference microphone needs to be tested, an audio signal generator is adjusted to a reference frequency point in a verification frequency range and is output to a transmitting sound source with a certain voltage (20 dB higher than background noise), after the sound source output is stable, the sound pressure level of the reference microphone is read, then the tested microphone is used for replacing the reference microphone, the output voltage of the audio signal generator is kept unchanged, and the sound pressure level of the tested microphone is read again. However, because there is an error between the outer diameters of the reference microphone and the tested microphone, or when calibrating and testing multiple sets of microphones, the outer diameters of the microphones are different, and it is necessary to adjust the geometric center of the front end and the center of the sound source to the same plane when clamping the microphone each time.
Therefore, to the above problem, the utility model provides a microphone experiment mounting fixture.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the deficiencies in the prior art and provide a microphone experiment mounting fixture.
The purpose of the utility model is realized like this:
a microphone experiment fixing clamp comprises a base, wherein a slide way is arranged on the base, scale marks are arranged on the side face of the slide way, a vertical column in the vertical direction is arranged in the slide way in a sliding mode, and a centering clamping assembly is arranged on the vertical column; the base is provided with a front end positioning bracket, and the front end positioning bracket is connected with the base through a telescopic rod; the central axis of the telescopic rod is superposed with the central line of the extension direction of the slide way on the upper end surface of the base; the front end positioning bracket can support a shell at the front end of the microphone, and forms a limiting effect with the protective cover, and the front end positioning bracket contracts downwards after the shell is clamped, so that the object obstacle at the front end can be reduced, and the scattering influence on the test sound is reduced; the T-shaped sliding block is arranged at the lower end of the upright post, and the T-shaped slide way is arranged in the slide way, so that the upright post can be prevented from shaking in the sliding process, and the angle error is reduced; through the scale marks, the constant linear distance from the front end of the microphone to a sound source can be ensured during each comparison test, and the experimental error is further reduced.
The centering and clamping assembly comprises a fixed centering disc, a sliding centering disc, a clamping connecting rod and a clamping block hinged with the clamping connecting rod;
the fixed centering disc is fixedly arranged on the upright post, and the central axis of the upright post is superposed with the diameter of the circular end face of the fixed centering disc; the geometric center of the circular end face of the fixed centering disc is axially provided with a mounting hole in a penetrating manner, the geometric center of the circular end face of the sliding centering disc is fixedly provided with a threaded shaft, and the threaded shaft penetrates through the mounting hole to fixedly and slidably connect the fixed centering disc and the sliding centering disc; a fastening nut is sleeved at one end of the threaded shaft, which extends out of the fixed centering disc, and the fastening nut is in threaded fit with the threaded shaft;
the middle part of the clamping connecting rod is provided with a first hinge hole, and the edge of the sliding centering disc is provided with a first hinge shaft; the first hinge hole is fixedly and rotatably connected with the first hinge shaft; one end of the clamping connecting rod is provided with a second hinged shaft, the clamping block is provided with a second hinged hole, and the second hinged shaft is fixedly and rotatably connected with the second hinged hole; the other end of the clamping connecting rod is provided with a spherical sliding groove, the outer cylindrical surface of the fixed centering disc is provided with a ball head guide rod, the team guide rod and the outer cylindrical surface of the fixed centering disc are connected through a spring cylinder, and the ball head guide rod and the spherical sliding groove are in limit sliding fit;
four groups of clamping connecting rods are evenly arranged along the circumference of the central axis of the threaded shaft, and the intervals between each group are 90 degrees;
and an elastic part and a limiting component are arranged between the fixed centering disc and the sliding centering disc.
Furthermore, the elastic part is a spring, and the spring is sleeved on the threaded shaft and positioned between the fixed centering disc and the sliding centering disc.
Furthermore, the limiting component comprises a limiting shaft and a limiting hole; the limiting holes are axially communicated on the circular end face of the sliding centering disc, and at least 3 limiting holes are uniformly distributed along the circumference of the central shaft of the sliding centering disc; the fixed centering disc is provided with limiting shafts, and the number and the positions of the limiting shafts are matched with the limiting holes; the limiting shaft is in sliding splicing fit with the limiting hole; due to the limiting effect of the limiting shaft and the limiting hole, the sliding centering disc and the fixed centering disc always ensure the same axis when being adjusted, the torsion generated when the adjusting nut is rotated is avoided to cause the bending deformation of the clamping connecting rod, the stability of the structure is improved, and the error of the mechanical structure is further reduced.
The base is provided with a level bubble, and four corners of the base are provided with adjusting ground feet.
The utility model has the advantages that:
by the centering clamping device, the geometric center of the front end of the microphone is kept unchanged before and after the reference microphone and the tested microphone are replaced, so that the position error caused by repeated clamping and aligning is reduced; through the setting of front end location bracket, play the effect of propping at the in-process that presss from both sides tightly, simultaneously, can fix a position the linear distance between microphone front end and the sound source, further reduced the linear distance error.
Drawings
Fig. 1 is a schematic structural view of the experimental fixing clamp for a microphone of the present invention;
fig. 2 is a schematic structural view of the centering and clamping assembly of the present invention;
fig. 3 is a schematic structural view of the middle fixed centering plate of the present invention;
FIG. 4 is a structural diagram of the sliding centering plate of the present invention;
FIG. 5 is a schematic structural view of a clamping link according to the present invention;
fig. 6 is a schematic structural view of the clamping block of the present invention;
fig. 7 is a schematic structural view of a microphone according to the present invention;
in the figure: 1. the microphone comprises a base, 2, a microphone, 201, a protective cover, 202, a shell, 3, a fixed centering structure, 301, a fixed centering disc, 302, a stand column, 303, a mounting hole, 304, a spring cylinder, 305, a ball head guide rod, 306, a T-shaped sliding block, 307, a limiting shaft, 4, a sliding centering disc, 401, a first hinge shaft, 403, a limiting hole, 5, a clamping connecting rod, 501, a first hinge hole, 502, a second hinge shaft, 503, a spherical sliding groove, 6, a clamping block, 601, a second hinge hole, 7, a threaded shaft, 8, a fastening nut, 9, a spring, 13, a front end positioning bracket, 1301, a telescopic rod, 14, T-shaped sliding ways, 15, an adjusting ground foot, 16, a first horizontal bubble, 17, a second horizontal bubble and 18 scale marks.
Detailed Description
In order to make the technical solutions in the embodiments of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As shown in fig. 1-7:
example one
A microphone experiment fixing clamp comprises a base 1, wherein a slide way is arranged on the base 1, scale marks 18 are arranged on the side face of the slide way, a vertical column 302 in the vertical direction is arranged in the slide way in a sliding mode, and a centering clamping assembly is arranged on the vertical column 302; the base 1 is provided with a front end positioning bracket 13, and the front end positioning bracket 13 is connected with the base 1 through a telescopic rod 1301; the central axis of the telescopic rod 1301 and the central line of the slide rail in the extending direction are superposed on the upper end face of the base 1; the front end positioning bracket 13 can support the shell 202 at the front end of the microphone 2 and form a limiting effect with the protective cover, and the front end positioning bracket contracts downwards after the shell 202 is clamped, so that the object obstacle at the front end can be reduced, and the scattering influence on the test sound is reduced; the T-shaped sliding block 306 is arranged at the lower end of the upright column 302, and the T-shaped slide way 14 is arranged in the slide way, so that the upright column 302 can be prevented from shaking in the sliding process, and the angle error is reduced; the base 1 is provided with a first horizontal bubble 16 and a second horizontal bubble 17 which are perpendicular to each other, the four corners of the base 1 are provided with adjusting feet 15, and the upper end face of the base 1 is kept horizontal by observing the first horizontal bubble 16 and the second horizontal bubble 17 and rotating the adjusting feet 15 in a calibration test preparation stage.
The centering and clamping assembly comprises a fixed centering disc 301, a sliding centering disc 4, a clamping connecting rod 5 and a clamping block 6 hinged with the clamping connecting rod 5;
the fixed centering disc 301 is fixedly arranged on the upright column 302, and the central axis of the upright column 302 is superposed with the diameter of the circular end face of the fixed centering disc 301; the geometric center of the circular end face of the fixed centering disc 301 is respectively provided with a mounting hole 303 in a penetrating way along the axial direction, the geometric center of the circular end face of the sliding centering disc 4 is fixedly provided with a threaded shaft 7, and the threaded shaft 7 penetrates through the mounting hole 303 to fixedly and slidably connect the fixed centering disc 301 and the sliding centering disc 4; a fastening nut 8 is sleeved at one end, extending out of the fixed centering disc 301, of the threaded shaft 7, and the fastening nut 8 is in threaded fit with the threaded shaft 7;
a first hinge hole 501 is formed in the middle of the clamping connecting rod 5, and a first hinge shaft 401 is formed in the edge of the sliding centering disc 4; the first hinge hole 501 is fixedly and rotatably connected with the first hinge shaft 401; a second hinge shaft 502 is arranged at one end of the clamping connecting rod 5, a second hinge hole 601 is formed in the clamping block 6, and the second hinge shaft 502 is fixedly and rotatably connected with the second hinge hole 601; the other end of the clamping connecting rod 5 is provided with a spherical sliding groove 503, the outer cylindrical surface of the fixed centering disc 301 is provided with a ball head guide rod 305, the ball team guide rod is connected with the outer cylindrical surface of the fixed centering disc 301 through a spring air cylinder 304, and the ball head guide rod 305 is in limit sliding fit with the spherical sliding groove 503;
four groups of clamping connecting rods 5 are evenly arranged along the circumference of the central axis of the threaded shaft 7, and the interval between each group is 90 degrees;
a spring 9 is arranged between the fixed centering plate 301 and the sliding centering plate 4, and the spring 9 is sleeved on the threaded shaft 7 at a position between the fixed centering plate 301 and the sliding centering plate 4.
The circular end face of the sliding centering disk 4 is provided with limit holes 403 which are through along the axial direction, and 4 limit holes 403 are uniformly distributed along the circumference of the central shaft of the sliding centering disk 4; the fixed centering disc 301 is provided with a limiting shaft 307, and the number and the position of the limiting shaft 307 are matched with those of the limiting holes 403; the limit shaft 307 is matched with the limit hole 403 in a sliding and inserting manner; due to the limiting effect of the limiting shaft 307 and the limiting hole 403, the sliding centering disc 4 and the fixed centering disc 301 always ensure the same axial center during adjustment, the clamping connecting rod 5 is prevented from bending and deforming due to the torsion generated when the adjusting nut is rotated, the stability of the structure is improved, and the error of the mechanical structure is further reduced.
Before the calibration test is started, the front end of the microphone 2 is placed on the front end positioning bracket 13, the edge of the protective cover 201 of the microphone 2 is superposed with the front end positioning bracket 13, the shell 202 partially extends into the space between 4 circumferentially and uniformly distributed clamping blocks 6, and the fastening nut 8 is twisted; the sliding centering disk 4 slides along the threaded shaft 7 towards the fixed centering disk 301, and the four clamping links 5 are simultaneously retracted inwards until the housing 202 of the microphone 2 is clamped. Because the sliding centering disk 4 and the fixed centering disk 301 are limited by 4 groups of limiting shafts 307 and limiting holes 403 which are uniformly distributed along the axis, the torsion to the circumference is very small in the process of rotating and clamping, and the mechanical deformation can be ignored; at the moment, the sliding centering disc 4, the fixed centering disc 301 and the microphone 2 are coaxial; before and after the reference microphone and the tested microphone are replaced, the change of the geometric center position of the front end of the microphone during clamping cannot be influenced due to the change of the outline dimension of the microphone shell 202, and the experimental precision is ensured. After the test is completely clamped, the upright column 302 is pushed by the limiting action of the front end positioning bracket 13, the position of the front end of the microphone 2 is adjusted, and the consistency between the front end and the rear end of the comparison test is ensured; after clamping and positioning are completed, the front end positioning bracket 13 is pressed down through the telescopic rod 1301, so that the front end is fully suspended, and the noise scattering interference of the test sound is avoided.
Example two
On the basis of the first embodiment, in order to ensure that the distance between the front end of the microphone 2 and the sound source is kept consistent in the comparison test while the front end of the microphone 2 is fully suspended, the upright column 302 can be pushed towards the sound source direction after clamping, so that the suspension space at the front end of the microphone 2 is enlarged, and then the scale mark 18 is used for measurement and positioning; the method specifically comprises the following steps:
let a be the display scale of the upright post 302 on the scale line 18 when the rear edge of the protective sleeve 201 of the reference microphone is contacted with the front edge of the front end positioning bracket 13 in the clamping state, and b be the scale after the upright post 302 is pushed in. The pushforward distance is then (b-a). After the tested microphone is replaced, the rear edge of the protective sleeve 201 is contacted with the front edge of the front end positioning bracket 13 in the clamping state of the tested microphone, the front end positioning bracket 13 is lowered, the upright post 302 is pushed to move forwards (b-a), and at the moment, the distance between the reference microphone 2 and the sound source is ensured to be consistent with the distance between the tested microphone 2 and the sound source in calibration, so that the experimental error is reduced, and the method is suitable for the calibration test of the free field comparison method between the microphones with different lengths and the reference microphone 2.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "one end", "the other end", "left", "right", "top", "bottom", "inner", "outer", "end face", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
The exemplary embodiments of the present invention have been described in detail with reference to the preferred embodiments, however, it will be understood by those skilled in the art that various modifications and changes may be made to the specific embodiments without departing from the concept of the present invention, and various combinations of the technical features and structures of the present invention may be implemented without departing from the scope of the present invention.
Claims (5)
1. The utility model provides a microphone experiment mounting fixture, includes the base, its characterized in that: the base is provided with a slide way, the side surface of the slide way is provided with scale marks, a vertical column in the vertical direction is arranged in the slide way in a sliding manner, and the vertical column is provided with a centering clamping assembly; the base is provided with a front end positioning bracket, and the front end positioning bracket is connected with the base through a telescopic rod; the central axis of the telescopic rod and the central line of the extension direction of the slide way are superposed on the upper end face of the base.
2. The microphone experiment fixing clamp as claimed in claim 1, wherein: the centering and clamping assembly comprises a fixed centering disc, a sliding centering disc, a clamping connecting rod and a clamping block hinged with the clamping connecting rod;
the fixed centering disc is fixedly arranged on the upright post, and the central axis of the upright post is superposed with the diameter of the circular end face of the fixed centering disc; the geometric center of the circular end face of the fixed centering disc is provided with a mounting hole in an axial penetrating manner, the geometric center of the circular end face of the sliding centering disc is fixedly provided with a threaded shaft, and the threaded shaft penetrates through the mounting hole to fixedly and slidably connect the fixed centering disc and the sliding centering disc; a fastening nut is sleeved at one end of the threaded shaft, which extends out of the fixed centering disc, and the fastening nut is in threaded fit with the threaded shaft;
the middle part of the clamping connecting rod is provided with a first hinge hole, and the edge of the sliding centering disc is provided with a first hinge shaft; the hinge hole I is fixedly and rotatably connected with the hinge shaft I; one end of the clamping connecting rod is provided with a second hinged shaft, the clamping block is provided with a second hinged hole, and the second hinged shaft is fixedly and rotatably connected with the second hinged hole; the other end of the clamping connecting rod is provided with a spherical sliding groove, the outer cylindrical surface of the fixed centering disc is provided with a ball head guide rod, the team guide rod and the outer cylindrical surface of the fixed centering disc are connected through a spring cylinder, and the ball head guide rod and the spherical sliding groove are in limit sliding fit;
four groups of clamping connecting rods are evenly arranged along the circumference of the central axis of the threaded shaft, and the intervals between each group are 90 degrees;
and an elastic part and a limiting component are arranged between the fixed centering disc and the sliding centering disc.
3. The microphone experiment fixing clamp as claimed in claim 2, wherein: the elastic part is a spring, and the spring is sleeved on the threaded shaft and positioned between the fixed centering disc and the sliding centering disc.
4. A microphone experiment fixing jig according to claim 2, characterized in that: the limiting assembly comprises a limiting shaft and a limiting hole; the limiting holes are axially communicated on the circular end face of the sliding centering disc, and at least 3 limiting holes are uniformly distributed along the circumference of the central shaft of the sliding centering disc; the fixed centering disc is provided with limiting shafts, and the number and the positions of the limiting shafts are matched with the limiting holes; the limiting shaft is matched with the limiting hole in a sliding insertion mode.
5. A microphone experiment fixing jig according to claim 1, characterized in that: the base is provided with a horizontal bubble, and four corners of the base are provided with adjusting feet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223342213.1U CN218776481U (en) | 2022-12-14 | 2022-12-14 | Microphone experiment mounting fixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223342213.1U CN218776481U (en) | 2022-12-14 | 2022-12-14 | Microphone experiment mounting fixture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218776481U true CN218776481U (en) | 2023-03-31 |
Family
ID=85723922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223342213.1U Active CN218776481U (en) | 2022-12-14 | 2022-12-14 | Microphone experiment mounting fixture |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218776481U (en) |
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2022
- 2022-12-14 CN CN202223342213.1U patent/CN218776481U/en active Active
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