Sound transmission test fixing device

Abstract

The utility model relates to the technical field of sound transmission testing, in particular to a sound transmission testing fixing device. The microphone is arranged at a to-be-detected sound position of an automobile; comprising a fixing base used for being connected with an automobile body; the mounting seat is used for mounting the microphone; one end of the adjusting arm is rotatably connected with the fixed seat, and the other end of the adjusting arm is connected with the mounting seat; wherein the adjusting arm comprises a first arm body, a second arm body and a connecting structure, the connecting structure is used for enabling the first arm body to be rotatably and movably connected with the second arm body, and the moving direction is the length direction of the second arm body. The sound transmission test fixing device is adjustable in multiple dimensions, high in flexibility and accurate in positioning.

Description

Technical Field

[0001] The present application relates to the technical field of sound transmission testing, and in particular to a sound transmission testing fixture. Background Art

[0002] In the process of developing automobile NVH performance, it is often necessary to collect near-field noise from some noise sources of the automobile (such as noise-generating components such as engines, electric drives, compressors, etc.) to analyze the NVH problems they generate (i.e., acoustic testing). At this time, it is necessary to arrange microphones near these objects to be tested, and the microphone installation position is generally selected at a position 10 cm from the surface of the object to be tested (industry standard). However, due to differences in the selected location and the surrounding environment, the selected 10 cm measurement position may not be able to arrange the microphone well, and some fixtures are needed to assist in the installation of the microphone. The existing fixture structure is limited, the flexibility of height and angle adjustment is low, the adjustment process is often time-consuming and labor-intensive, and it is difficult to adjust the microphone to the exact position. Utility Model Content

[0003] Based on this, it is necessary to provide a sound transmission test fixture with high adjustment flexibility.

[0004] A sound transmission test fixture is used to arrange a microphone at a sound position to be tested in a car; comprising:

[0005] A fixing seat, used for connecting with the automobile body;

[0006] A mounting base, used for mounting the microphone;

[0007] An adjusting arm, one end of which is rotatably connected to the fixing seat, and the other end of which is connected to the mounting seat;

[0008] Wherein, the adjusting arm comprises a first arm body, a second arm body and a connecting structure, wherein the connecting structure is used for the first arm body to be rotatably and movably connected to the second arm body, and the moving direction is the length direction of the second arm body.

[0009] In one embodiment, the connecting structure includes a connecting member, a movable track and a fastener, the connecting member is arranged on the first arm body; the movable track is arranged on the second arm body, and the connecting member is rotatably and movably arranged on the movable track; the fastener is connected to the connecting member to limit the movement of the connecting member on the track.

[0010] In one embodiment, the movable track is configured as a strip groove opened on the second arm body, and the connecting member is movably inserted into the strip groove; the fastener can be locked and connected with the connecting member and abut against the second arm body.

[0011] In one embodiment, the first arm is connected to the mounting seat, and the second arm is rotatably connected to the fixing seat.

[0012] In one embodiment, the fixing seat includes a seat body and a rotating shaft rotatably disposed on the seat body, the rotating shaft is provided with a first locking member capable of abutting against the seat body, and the second arm body is connected to the rotating shaft.

[0013] In one embodiment, a connecting portion is provided on the rotating shaft, the connecting portion is movably inserted into the movable track, and a second locking member abutting against the second arm is provided on the connecting portion.

[0014] In one of the embodiments, a magnetic attraction component is provided on the fixing seat, and the magnetic attraction component is used to be adsorbed on the car body.

[0015] In one of the embodiments, an adhesive layer is provided on the magnetic attraction member, and the adhesive layer is bonded to the automobile body.

[0016] In one embodiment, the acoustic transmission test fixture further comprises a prying piece, and the prying piece is used to release the connection between the fixing seat and the automobile body.

[0017] In one embodiment, the prying member is provided with a mounting hole, and the fixing seat is provided with a mounting portion matching with the mounting hole.

[0018] Compared with the prior art, the adjustment arm of the sound transmission test fixture is rotatably connected to the fixed seat, and the first arm body and the second arm body of the adjustment arm are connected in a rotatable and movable manner. After the position of the fixed seat is fixed, the fixture can also adjust the position of the mounting seat by rotating the adjustment arm relative to the fixed seat, rotating the first arm body relative to the second arm body, and moving the first arm body relative to the second arm body in the length direction. The multi-dimensional adjustability improves the overall flexibility of the fixture, and there are fewer restrictions on the installation position of the fixed seat, ensuring that it has very strong versatility and reliability. Not only is the positioning of the mounting seat accurate, but the adjustment operation is also more labor-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 This is a schematic diagram of the structure of the sound transmission test fixture provided in this application.

[0021] Figure 2 A top view of the acoustic transmission test fixture provided in this application.

[0022] Figure 3 for Figure 2 Sectional view along line AA.

[0023] Figure 4 This is a schematic structural diagram of the first arm provided in this application.

[0024] Figure 5 This is a schematic structural diagram of the second arm provided in this application.

[0025] Figure 6 This is a schematic diagram of the structure of the fixing seat provided in this application.

[0026] : Figure numerals: 10, fixing seat; 20, mounting seat; 201, through hole; 30, adjusting arm; 31, first arm body; 32, second arm body; 33, connecting structure; 331, connecting member; 332, movable track; 332a, strip groove; 333, fastener; 11, seat body; 12, accommodating cavity; 13, rotating shaft; 131, flange; 14, mounting portion; 15, pin shaft; 16, first locking member; 41, connecting portion; 42, second locking member; 50, magnetic member; 51, opening; 52, adhesive layer; 60, prying member; 61, handle; 62, prying portion; 621, sharp edge; 63, mounting hole; 71, spherical protrusion; 72, spherical portion. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0028] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0030] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0031] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0032] The microphone arrangement before the test begins is as follows: 1. The tester selects a position near the object to be tested (10 cm away) and uses a tape measure to measure and determine the distance; 2. Use tape to wrap the microphone around the components near the selected position. At this point, the selected position may have deviated from the microphone binding position.

[0033] Since there is no professional mounting bracket, the microphone layout requires many auxiliary consumables (such as sponge pads, tapes, etc.). The layout process is time-consuming, and it takes a lot of time to dismantle it after the test, which is time-consuming and laborious. The microphone itself is also a fragile precision instrument. If it is not well protected, the microphone is easily damaged and contaminated during use. It is also troublesome to dismantle it after the test is completed. In addition, the consistency of the positioning layout based solely on the tape measure cannot be guaranteed. The microphone binding position may deviate from the selected 10cm position, so the consistency of the test is difficult to guarantee and is easily affected by other factors.

[0034] Secondly, the reliability of microphone installation is also a big problem. When using a fixing device to install the microphone, if the fixing device is easy to shake or deform, it will have a very adverse effect on the test safety and test reliability.

[0035] For example, the auxiliary extension rod of the fixture is a slender spring structure. Although the bracket can be installed stably and reliably during static tests, it is easy to shake with the bumps of the vehicle during dynamic tests, and the reliability of the test and the safety of the microphone cannot be guaranteed. Alternatively, the fixture has an adjustment arm, which has sufficient rigidity and can adjust the position, but the adjustment flexibility is still weak, requiring constant debugging, which is time-consuming and labor-intensive, and is still prone to inaccurate positioning problems.

[0036] See also Figures 1 to 6 The present application provides a sound transmission test fixture, which is used to arrange the microphone at the sound position to be tested in the car. The sound transmission test fixture includes a fixing seat 10, a mounting seat 20, and an adjusting arm 30, wherein the adjusting arm 30 includes a first arm body 31, a second arm body 32 and a connecting structure 33. The fixing seat 10 is used to be connected to the car body, and the mounting seat 20 is used to install the microphone. One end of the adjusting arm 30 is rotatably connected to the fixing seat 10, and the other end is connected to the mounting seat 20. The adjusting arm 30 includes a first arm body 31, a second arm body 32 and a connecting structure 33, and the connecting structure 33 is used for the first arm body 31 to be rotatably and movably connected to the second arm body 32, and the moving direction is the length direction of the second arm body 32.

[0037] It can be understood that the rotatable connection between the adjusting arm 30 and the fixing seat 10 means that the adjusting arm 30 can rotate circumferentially around the axis of the fixing seat 10. The first arm body 31 is rotatably connected to the second arm body 32, which means that the first arm body 31 can flip up and down around the connection between it and the second arm body 32. The first arm body 31 is movably connected to the second arm body 32, which means that the connection between the first arm body 31 and the second arm body 32 can move in the length direction of the second arm body 32. That is, the height of the first arm body 31 on the second arm body 32 is variable.

[0038] Understandably, the circumferential rotation of the adjustment arm 30 can drive the mounting base 20 to adjust its position in a 360° direction relative to the fixed base 10. The fixed position of the fixed base 10 can be any mounting surface outside the test position, so that the position limitation of the fixed base 10 installed on the car body is very small and has very strong versatility. The most stable mounting surface can be selected to improve the reliability of the device, and it is not easy to fall off or shake during the dynamic test. At the same time, the connection height of the first arm body 31 on the second arm body 32 is variable, and it can be flipped relative to the second arm body 32. The overall adjustment flexibility is extremely high, and the position adjustment requirements of the mounting base 20 are met in multiple dimensions, ensuring that the mounting base 20 can be maintained at the most accurate collection position, the microphone installed thereon is accurately positioned, and the test results are accurate.

[0039] Furthermore, the connection structure 33 includes a connection member 331, a movable track 332 and a fastener 333. The connection member 331 is disposed on the first arm 31, the movable track 332 is disposed on the second arm 32, and the connection member 331 is rotatably and movably disposed on the movable track 332. The fastener 333 is connected to the connection member 331 and is used to limit the position movement of the connection member 331 on the track.

[0040] It can be understood that the connecting member 331 is rotatably arranged on the movable track 332, that is, the connecting member 331 can rotate relative to the movable track 332 around the axis of the connecting member 331. The connecting member 331 is movably arranged on the movable track 332, that is, the connecting member 331 can move in the length direction relative to the movable track 332. When the position needs to be fixed, the fastener 333 can be tightened to limit the movement and rotation of the connecting member 331.

[0041] In this embodiment, the movable track 332 is a strip groove 332a provided on the second arm body 32, and the connecting member 331 can be movably inserted into the strip groove 332a. The fastener 333 can be locked and connected with the connecting member 331 and abut against the second arm body 32.

[0042] Specifically, the strip groove 332a is opened along the length direction of the second arm body 32. The connecting member 331 is arranged at the end position of the first arm body 31 close to one end of the second arm body 32, and the connecting member 331 protrudes from the side of the first arm body 31. The connecting member 331 passes through the strip groove 332a and is connected to the fastener 333. When the fastener 333 is tightened, the side wall of the fastener 333 abuts against the second arm body 32, so that the connecting member 331 can no longer move. The position of the first arm body 31 can be adjusted by loosening the fastener 333, and the position of the arm body can be fixed by tightening the fastener 333. The operation is simple, time-saving and labor-saving.

[0043] Exemplarily, the connecting member 331 is a convex column provided on the first arm 31, and an external thread is provided on the outer wall of the convex column. The fastener 333 is provided as a nut, which can be screwed with the external thread on the convex column. Of course, it is not limited to this. In other embodiments, the connecting member 331 can also adopt other structures such as a screw, and the fastener 333 can also adopt other structures such as a cap with an internal thread.

[0044] Further, the first arm body 31 is connected to the mounting seat 20, and the second arm body 32 is rotatably connected to the fixing seat 10. That is, the first arm body 31 is an arm body located at the upper part of the adjusting arm 30, the second arm body 32 is an arm body located at the lower part of the adjusting arm 30, and the movable track 332 is arranged at the lower part of the adjusting arm 30.

[0045] Of course, it is not limited to this. In other embodiments, the second arm body 32 may be connected to the mounting seat 20, and the first arm body 31 may be rotatably connected to the fixing seat 10. That is, the second arm body 32 is an arm body located at the upper part of the adjusting arm 30, the first arm body 31 is an arm body located at the lower part of the adjusting arm 30, and the movable track 332 is arranged at the upper part of the adjusting arm 30. The adjustment method is more flexible and diverse.

[0046] In this embodiment, the fixing seat 10 includes a seat body 11 and a rotating shaft 13, and the second arm body 32 is connected to the rotating shaft 13. The rotating shaft 13 is rotatably disposed on the seat body 11, and a first locking member 16 capable of abutting against the seat body 11 is disposed on the rotating shaft 13.

[0047] The rotating shaft 13 is provided with a connecting portion 41, and the rotating shaft 13 is connected to the second arm body 32 through the connecting portion 41. The connecting portion 41 is provided with a second locking member 42 that can abut against the second arm body 32. The connecting portion 41 penetrates into the moving track 332 and can move relative to the moving track 332. That is, the connecting portion 41 can be movably penetrated on the moving track 332.

[0048] Optionally, the rotating shaft 13 is provided with an external thread, and the first locking member 16 is a locking nut sleeved on the outside of the rotating shaft 13 , which can abut against the seat body 11 when tightened, so that the rotating shaft 13 cannot rotate relative to the seat body 11 .

[0049] Optionally, the outer wall of the connecting portion 41 has an external thread, and the second locking member 42 is a nut, which is screwed on the portion of the connecting portion 41 that passes through the movable track 332. When the nut is tightened, it can abut against the side wall of the second arm 32, so that the connecting portion 41 cannot move relative to the movable track 332.

[0050] Of course, the present invention is not limited thereto, and the first locking member 16 and the second locking member 42 may also adopt other structures such as caps with internal threads.

[0051] In one embodiment, a magnetic member 50 is provided on the fixing seat 10, and the magnetic member 50 is used to be attached to the car body. The magnetic member 50 can be made of a material that can absorb metal, such as a magnet, so that the fixing seat 10 can be firmly attached to the car body without the aid of other structures, and the installation is simple and firm, with fewer parts.

[0052] Specifically, the seat body 11 is provided with a receiving cavity 12 with an opening at the bottom, and the magnetic attraction member 50 is placed in the receiving cavity 12 through the opening. The magnetic attraction member 50 and the rotating shaft 13 are anti-dropping matched to prevent the magnetic attraction member 50 from falling out of the seat body 11.

[0053] Preferably, an opening 51 is provided in the middle of the magnetic attraction member 50 , and the lower portion of the rotating shaft 13 passes through the opening 51 and extends outward to form a circle of flanges 131 , through which the magnetic attraction member 50 is confined in the accommodating cavity 12 .

[0054] Furthermore, an adhesive layer 52 is provided on the magnetic member 50, and the adhesive layer is bonded to the car body. The adhesive layer 52 can be formed by coating glue on the bottom of the magnetic member 50, and after coating the glue, the fixing seat 10 is directly pressed onto the car body. The fixing seat 10 is firmly fixed to the car body by bonding and magnetic attraction, and is not easy to fall off.

[0055] In order to release the connection between the fixing seat 10 and the car body, the sound transmission test fixture further includes a prying piece 60. The prying piece 60 has a handle 61 and a prying portion 62, and the prying portion 62 has a sharp edge 621. After the test is completed, when the fixture needs to be disassembled, the sharp edge 621 of the prying portion 62 can be inserted into the gap between the fixing seat 10 and the car body, and then the fixing seat 10 is pried off the car body.

[0056] Preferably, the fixing seat 10 is provided with a mounting portion 14, and the mounting portion 14 is provided with a pin 15. The prying member 60 is provided with a mounting hole 63, and the pin 15 can pass through the mounting hole 63 to mount the prying member 60 on the fixing seat 10. The prying portion 62 is located below the mounting hole 63, and the handle 61 is located above the prying portion 62.

[0057] It is understandable that when the handle 61 is pressed downward, the prying piece 60 can rotate around the fulcrum, so that the sharp edge 621 of the prying portion 62 can be inserted into the gap between the fixing seat 10 and the car body. Continue to press the handle 61 downward, the prying portion 62 can pry the fixing seat 10, the operation is simple and labor-saving, and the prying piece 60 is not easy to be lost.

[0058] Furthermore, the mounting base 20 is provided with a through hole 201, and a microphone can be installed in the through hole 201. The mounting base 20 and the first arm 31 are preferably provided with a movable connection, so that the mounting base 20 can also be adjusted relative to the first arm 31.

[0059] Specifically, a spherical protrusion 71 is provided on the mounting seat 20, and the interior of the spherical protrusion 71 is hollow. A spherical portion 72 is also provided at the position where the first arm 31 is connected to the mounting seat 20, and the spherical portion 72 is placed inside the spherical protrusion 71, and the two can rotate relative to each other.

[0060] Working principle:

[0061] Step 1: Loosen the first locking member 16 and attach the fixing base 10 to the vehicle body near the object to be measured (such as the subframe, the front longitudinal beam of the vehicle body, etc.). Then rotate the adjustment arm 30 to the desired position, tighten the first locking member 16, and the fixing base 10 is installed.

[0062] Step 2: Loosen the fastener 333 and the second locking member 42 to adjust the relative positions of the first arm 31 and the second arm 32. After the adjustment is appropriate, tighten the fastener 333 and the second locking member 42 to fix the positions of the first arm 31 and the second arm 32.

[0063] Step 3: Insert the microphone into the through hole 201 on the mounting base 20, and adjust the relative position of the mounting base 20 and the first arm 31. After the microphone is adjusted to align with the object to be measured, the installation of the fixture is completed.

[0064] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A microphone test fixture, used to place a microphone at a location to be tested on a vehicle; characterized in that: include: A fixing seat (10) for connecting to a vehicle body; A mounting base (20) for mounting the microphone; An adjusting arm (30), one end of the adjusting arm (30) being rotatably connected to the fixing seat (10), and the other end of the adjusting arm (30) being connected to the mounting seat (20); The adjusting arm (30) comprises a first arm body (31), a second arm body (32) and a connecting structure (33); the connecting structure (33) is used for the first arm body (31) to be rotatably and movably connected to the second arm body (32); and the moving direction of the first arm body (31) is the length direction of the second arm body (32).

2. The sound transmission test fixture according to claim 1, characterized in that: The connecting structure (33) comprises a connecting member (331), a movable track (332) and a fastener (333); the connecting member (331) is arranged on the first arm body (31); the movable track (332) is arranged on the second arm body (32); the connecting member (331) is rotatably and movably arranged on the movable track (332); the fastener (333) is connected to the connecting member (331) and is used to limit the movement of the connecting member (331) on the track.

3. The sound transmission test fixture according to claim 2, characterized in that: The movable track (332) is configured as a strip groove (332a) opened on the second arm body (32), and the connecting member (331) is movably inserted into the strip groove (332a); the fastener (333) can be locked and connected with the connecting member (331) and abut against the second arm body (32).

4. The sound transmission test fixture according to claim 2, characterized in that: The first arm body (31) is connected to the mounting seat (20), and the second arm body (32) is rotatably connected to the fixing seat (10).

5. The sound transmission test fixture according to claim 4, characterized in that: The fixed seat (10) comprises a seat body (11) and a rotating shaft (13) rotatably arranged on the seat body (11); the rotating shaft (13) is provided with a first locking member (16) capable of abutting against the seat body (11); and the second arm body (32) is connected to the rotating shaft (13).

6. The sound transmission test fixture according to claim 5, characterized in that: The rotating shaft (13) is provided with a connecting portion (41), the connecting portion (41) is movably inserted into the movable track (332), and the connecting portion (41) is provided with a second locking member (42) abutting against the second arm body (32).

7. The sound transmission test fixture according to claim 1, characterized in that: The fixing seat (10) is provided with a magnetic attraction member (50), and the magnetic attraction member (50) is used for being adsorbed on the body of the automobile.

8. The sound transmission test fixture according to claim 7, characterized in that: The magnetic attraction member (50) is provided with an adhesive layer (52), and the adhesive layer (52) is bonded to the automobile body.

9. The sound transmission test fixture according to claim 7, characterized in that: The sound transmission test fixture further comprises a prying piece (60), and the prying piece (60) is used to release the connection between the fixing seat (10) and the automobile body.

10. The sound transmission test fixture according to claim 9, characterized in that: The prying piece (60) is provided with a mounting hole (63), and the fixing seat (10) is provided with a mounting portion (14) matching with the mounting hole (63).

Images