Exhaust pipe noise measurement trolley

Abstract

This utility model discloses a noise measurement trolley for exhaust pipes, relating to the field of vehicle measurement technology. The exhaust pipe noise measurement trolley includes a moving platform and two positioning mechanisms. Each positioning mechanism includes a guide rail, a bracket, and a mounting assembly. The guide rail is horizontally mounted on the moving platform, the bracket is connected to the guide rail and can slide horizontally along it, and the mounting assembly is mounted on the bracket and can slide vertically along it. The mounting assembly has a mounting platform on which a noise measuring instrument for measuring exhaust pipe noise is mounted. In the two positioning mechanisms, the extension directions of the two guide rails are perpendicular to each other, and the intersection of the extension lines of the two guide rails is located outside the moving platform. The two noise measuring instruments can simultaneously measure the noise of the exhaust pipe from 45° directions on both sides, effectively avoiding errors caused by single-point measurement and improving measurement accuracy. The position adjustment process of the noise measuring instruments is simple and efficient, significantly improving measurement efficiency.

Description

Technical Field

[0001] This utility model relates to the field of vehicle testing technology, and in particular to a noise measuring trolley for exhaust pipes. Background Technology

[0002] The engine exhaust system is one of the components that contributes the most to vehicle noise. Measuring exhaust noise is not only essential to ensure vehicles meet factory requirements but also an effective means of monitoring vehicle performance. Currently, the industry commonly uses single-point noise measurement equipment. This equipment is held by hand or fixed at a predetermined distance at a 45° angle to the exhaust pipe outlet by the operator. To meet measurement requirements, the position of the noise measurement equipment needs to be adjusted and calibrated before measurement, a cumbersome process that leads to low measurement efficiency. Furthermore, because single-point fixed noise measurement equipment only collects data from a single location, it cannot eliminate random errors caused by airflow pulsation, reflected sound, and differences in environmental sound absorption coefficients, resulting in significant measurement errors. Utility Model Content

[0003] The main purpose of this invention is to propose a noise measurement trolley for exhaust pipes, which aims to solve the technical problems of low measurement efficiency and large measurement error caused by the cumbersome position adjustment process of existing noise measurement equipment.

[0004] To achieve the above objectives, the exhaust pipe noise measurement trolley proposed in this utility model includes a mobile platform and two positioning mechanisms. Each positioning mechanism includes a guide rail, a bracket, and a mounting assembly. The guide rail is horizontally mounted on the mobile platform, the bracket is connected to the guide rail and can slide horizontally along the guide rail, and the mounting assembly is mounted on the bracket and can slide vertically along the bracket. The mounting assembly has a mounting platform on which a noise measuring instrument for measuring the exhaust pipe noise is mounted. In the two positioning mechanisms, the extension directions of the two guide rails are perpendicular to each other, and the intersection of the extension lines of the two guide rails is located outside the mobile platform.

[0005] In one embodiment, the guide rail has a guide groove that extends along the extension direction of the guide rail. The bracket includes a base and a frame. The base is slidably connected to the guide groove and can slide horizontally along the guide groove. The frame is mounted on the base and extends vertically. The mounting assembly is mounted on the frame and can slide vertically along the frame.

[0006] In one embodiment, the guide groove includes an upper groove and a lower groove that are interconnected. The width of the upper groove is smaller than the width of the lower groove. The base includes an upper slider, a lower slider, and a connecting block. The connecting block is connected between the upper slider and the lower slider and forms an "I"-shaped structure with the upper slider and the lower slider. The lower slider extends into the lower groove and slides into the lower groove. The connecting block is located in the upper groove and slides into the upper groove. The upper slider is located outside the guide groove and can slide into the top of the guide groove.

[0007] In one embodiment, the frame includes a vertically extending vertical rod, and the mounting assembly includes a mounting plate, a fastening block, and a fastener. A groove for the vertical rod to pass through is formed on one side edge of the mounting plate, and an opening is formed on the side of the groove facing the edge of the mounting plate. The fastening block is located on one side of the opening, and the fastener is detachably inserted into the fastener and the mounting plate. The fastener can fasten the fastening block to the mounting plate so that the vertical rod is pressed against the groove by the fastening block. The upper surface of the mounting plate forms the mounting platform.

[0008] In one embodiment, there are two vertical rods, which are horizontally spaced to form a gap. The measuring end of the noise meter is positioned corresponding to the gap between the two vertical rods. Two sliding grooves are respectively formed on the mounting plate at the positions corresponding to the two vertical rods. The two sliding grooves are located on the same side edge of the mounting plate. Two abutment blocks are respectively provided at both ends of the fastening block. The fastener can fasten the fastening block to the mounting plate so that the two abutment blocks respectively abut the two vertical rods into the corresponding sliding grooves.

[0009] In one embodiment, two limiting plates are connected to one edge of the mounting plate where the sliding groove is provided. The two limiting plates and the mounting plate together form a receiving groove. Both sliding grooves are connected to the receiving groove. The fastening block is located in the receiving groove. A limiting block is connected to one end of each limiting plate away from the mounting plate. Each limiting block extends into the receiving groove. The two limiting blocks on the two limiting plates are respectively provided for the two abutting blocks. Each limiting block can abut against the side of its corresponding abutting block away from the vertical rod.

[0010] In one embodiment, the fastener is a fastening bolt, the fastening block has a first threaded hole that mates with the fastening bolt, the first threaded hole is located between the two abutment blocks, and the mounting plate has a second threaded hole that mates with the fastening bolt.

[0011] In one embodiment, the mounting plate has mounting holes for mounting the noise measuring instrument.

[0012] In one embodiment, the outer wall of the guide rail is provided with a plurality of scale markings evenly distributed along the extension direction of the guide rail.

[0013] In one embodiment, the bottom of the mobile platform is provided with braked wheels.

[0014] This invention proposes a noise measurement trolley for exhaust pipes. Two noise measuring instruments are mounted on a moving platform via two positioning mechanisms. The two guide rails in these mechanisms are perpendicular to each other, and their extensions intersect at a measurement point outside the moving platform. By moving the platform, the measurement point is aligned with the exhaust pipe of the vehicle under test. The extensions of both guide rails are distributed at a 45° angle to the measurement point, ensuring that the two noise measuring instruments on the guide rails are always at a 45° angle to the exhaust pipe at the measurement point, eliminating the need to adjust the angle between the noise measuring instruments and the exhaust pipe. The two noise measuring instruments can simultaneously measure the exhaust pipe noise from both sides at a 45° angle, effectively avoiding errors caused by single-point measurements and improving measurement accuracy. Each noise meter is slidably mounted on a bracket via a mounting assembly. This assembly allows for vertical sliding of the noise meters, enabling rapid adjustment of their vertical height. The mounting assembly is also slidably connected to a guide rail via the bracket. The bracket allows the mounting assembly and the noise meters mounted on it to slide along the guide rail, thus enabling rapid adjustment of the distance between the noise meters and the exhaust pipe, ensuring the noise meters are positioned correctly for measurement. The noise meter adjustment process is simple and efficient, significantly improving measurement efficiency. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the structure of an embodiment of the exhaust pipe noise measurement trolley provided by this utility model;

[0017] Figure 2 A schematic diagram of the guide rail and base of an embodiment of the noise measurement trolley for exhaust pipes provided by this utility model;

[0018] Figure 3 A schematic diagram of an embodiment of the mounting assembly for the exhaust pipe noise measurement trolley provided by this utility model.

[0019] Explanation of icon numbers:

[0020] 10. Mobile platform; 11. Walking wheels; 12. Brake; 20. Positioning mechanism; 21. Guide rail; 211. Guide groove; 211a. Upper groove; 211b. Lower groove; 212. Scale markings; 22. Bracket; 221. Base; 221a. Upper slider; 221b. Lower slider; 221c. Connecting block; 222. Frame; 2221. Vertical rod; 23. Mounting assembly; 231. Mounting plate; 2311. Limiting plate; 2312. Receiving groove; 2313. Limiting block; 232. Fastening block; 2321. Abutment block; 2322. First threaded hole; 233. Fastener; 234. Slide groove; 235. Mounting platform; 236. Mounting hole; 100. Noise measuring instrument.

[0021] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0023] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0024] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0025] Currently, the industry commonly uses single-point noise measurement devices to measure exhaust pipe noise. These devices are held by hand or fixed at a predetermined distance at a 45° angle to the exhaust pipe outlet by the operator. To meet measurement requirements, the position of the noise measurement device needs to be adjusted and calibrated before measurement, a cumbersome process that leads to low measurement efficiency. Furthermore, because single-point fixed noise measurement devices only collect data from a single location, they cannot eliminate random errors caused by airflow pulsation, reflected sound, and differences in environmental sound absorption coefficients, resulting in significant measurement errors.

[0026] This utility model proposes a noise measuring trolley for exhaust pipes, including a mobile platform 10 and two positioning mechanisms 20. Each positioning mechanism 20 includes a guide rail 21, a bracket 22, and a mounting assembly 23. The guide rail 21 is horizontally mounted on the mobile platform 10, the bracket 22 is connected to the guide rail 21 and can slide horizontally along the guide rail 21, and the mounting assembly 23 is mounted on the bracket 22 and can slide vertically along the bracket 22. The mounting assembly 23 has a mounting platform 235, on which a noise measuring instrument 100 for measuring the noise of the exhaust pipe is mounted. In the two positioning mechanisms 20, the extension directions of the two guide rails 21 are perpendicular to each other, and the intersection of the extension lines of the two guide rails 21 is located outside the mobile platform 10.

[0027] Please see Figure 1 Two guide rails 21 are mounted on the moving platform 10. The extension directions of the two guide rails 21 are perpendicular to each other, and the extension lines of the two guide rails 21 intersect at the measurement point. The measurement point is located outside the moving platform 10. The extension lines of each guide rail 21 are distributed at a 45° angle to the measurement point. Each noise meter 100 is set on the guide rail 21 through the mounting component 23 and the bracket 22, so that each noise meter 100 is distributed at a 45° angle to the measurement point, and the two noise meters 100 are located on both sides of the measurement point. Each noise meter 100 is mounted on the mounting platform 235. The mounting component 23 can slide vertically relative to the bracket 22 and drive the noise meter 100 to move vertically, so as to adjust the vertical height of the noise meter 100, so that the noise meter 100 can measure the noise of the exhaust pipe set at the measurement point from different height positions. Mounting assembly 23 is connected to guide rail 21 via bracket 22. The bracket 22 slides horizontally along guide rail 21, allowing the noise meter 100 on mounting assembly 23 to slide horizontally as well. This adjusts the horizontal distance between the noise meter 100 and the measurement point, enabling the noise meter 100 to measure exhaust pipe noise from different distances. It should be noted that the noise meter 100 in this invention uses existing volume measurement equipment.

[0028] The exhaust pipe noise measurement trolley proposed in this utility model has two noise measuring instruments 100 mounted on a moving platform 10 via two positioning mechanisms 20. The two guide rails 21 in the positioning mechanisms 20 are perpendicular to each other, and their extensions intersect at a measurement point outside the moving platform 10. By moving the moving platform 10, the measurement point is aligned with the exhaust pipe of the vehicle under test. The extensions of the two guide rails 21 are distributed at a 45° angle to the measurement point, ensuring that the two noise measuring instruments 100 mounted on the two guide rails 21 are always at a 45° angle to the exhaust pipe at the measurement point, eliminating the need to adjust the angle between the noise measuring instruments 100 and the exhaust pipe. The two noise measuring instruments 100 can simultaneously measure the exhaust pipe noise from both sides at a 45° angle, effectively avoiding errors caused by single-point measurements and improving measurement accuracy. Each noise meter 100 is slidably mounted on the bracket 22 via the mounting assembly 23. The mounting assembly 23 can drive the noise meter 100 to slide vertically, enabling rapid adjustment of the vertical height of the noise meter 100. The mounting assembly 23 is slidably connected to the guide rail 21 via the bracket 22. The bracket 22 can drive the mounting assembly 23 and the noise meter 100 mounted on the mounting assembly 23 to slide along the guide rail 21, thereby enabling rapid adjustment of the distance between the noise meter 100 and the exhaust pipe, ensuring that the setting position of the noise meter 100 meets the measurement requirements. The position adjustment process of the noise meter 100 is simple and efficient, significantly improving measurement efficiency.

[0029] In one embodiment, a guide groove 211 is provided on the guide rail 21, the guide groove 211 extends along the extension direction of the guide rail 21, the bracket 22 includes a base 221 and a frame 222, the base 221 is slidably connected to the guide groove 211 and can slide horizontally along the guide groove 211, the frame 222 is mounted on the base 221 and extends vertically, and the mounting assembly 23 is mounted on the frame 222 and can slide vertically along the frame 222.

[0030] Understandably, a guide groove 211 is provided on the guide rail 21 along its extension direction, and the base 221 is slidably connected to the guide groove 211. The guide groove 211 provides a sliding path guide for the base 221, ensuring the stability and smoothness of the base 221 sliding along the guide rail 21. This allows the base 221 to drive the mounting assembly 23 and the noise measuring instrument 100 mounted on the frame 222 to slide along the guide groove 211, facilitating the rapid adjustment of the distance between the noise measuring instrument 100 and the exhaust pipe, thereby improving the efficiency and stability of the position adjustment of the noise measuring instrument 100.

[0031] In one embodiment, the guide groove 211 includes an upper groove portion 211a and a lower groove portion 211b that are interconnected. The width of the upper groove portion 211a is smaller than the width of the lower groove portion 211b. The base 221 includes an upper slider 221a, a lower slider 221b, and a connecting block 221c. The connecting block 221c is connected between the upper slider 221a and the lower slider 221b and forms an "I"-shaped structure with the upper slider 221a and the lower slider 221b. The lower slider 221b extends into the lower groove portion 211b and slides in cooperation with the lower groove portion 211b. The connecting block 221c is located in the upper groove portion 211a and slides in cooperation with the upper groove portion 211a. The upper slider 221a is located outside the guide groove 211 and can slide in cooperation with the top of the guide groove 211.

[0032] Please see Figure 2 The guide groove 211 has its opening facing upwards. The upper groove 211a is located above the lower groove 211b, and the width of the upper groove 211a is smaller than the width of the lower groove 211b. The width of the lower slider 221b matches the width of the lower groove 211b, meaning the width of the lower slider 221b is greater than the width of the upper groove 211a. This ensures that when the lower slider 221b slides within the lower groove 211b, the sidewall of the upper groove 211a confines the lower slider 221b within the lower groove 211b. The upper slider 221a is located outside the guide groove 211, providing installation space for the frame 222. The connecting block 221c connects the upper slider 221a and the lower slider 221b, effectively preventing the base 221 from detaching from the guide groove 211 and ensuring the stability and accuracy of the base 221 during sliding.

[0033] In one embodiment, the frame 222 includes a vertically extending vertical rod 2221, and the mounting assembly 23 includes a mounting plate 231, a fastening block 232, and a fastener 233. A groove 234 for the vertical rod 2221 to pass through is provided on one side edge of the mounting plate 231. An opening is formed on the side of the groove 234 facing the edge of the mounting plate 231. The fastening block 232 is located on the side of the opening. The fastener 233 is detachably inserted into the fastener 233 and the mounting plate 231, and the fastener 233 can fasten the fastening block 232 to the mounting plate 231 so that the vertical rod 2221 is pressed against the groove 234 by the fastening block 232. A mounting platform 235 is formed on the upper surface of the mounting plate 231.

[0034] Please see Figure 3The slide groove 234 and the vertical rod 2221 are slidably engaged. The fastening block 232 is located on the opening side of the slide groove 234. The fastening block 232 and the mounting plate 231 together surround the vertical rod 2221 in the slide groove 234. When the fastening block 232 is fastened to the mounting plate 231 by the fastener 233, the fastening block 232 presses the vertical rod 2221 against the slide groove 234, so that the fastening block 232 and the mounting plate 231 together clamp the vertical rod 2221, so that the mounting plate 231 and the vertical rod 2221 remain relatively fixed, thereby fixing the mounting plate 231 to the vertical rod 2221. When the fastener 233 loosens the fastening block 232 from the mounting plate 231, the fastening block 232 disengages from the vertical rod 2221, allowing the vertical rod 2221 to slide relative to the slide groove 234, thereby allowing the mounting plate 231 to slide relative to the vertical rod 2221. The vertical rod 2221 provides guidance for the sliding of the mounting plate 231, facilitating the adjustment of the height of the mounting plate 231.

[0035] In one embodiment, there are two vertical rods 2221, which are horizontally spaced to form a gap. The measuring end of the noise meter 100 is positioned corresponding to the gap between the two vertical rods 2221. Two sliding grooves 234 are respectively provided on the mounting plate 231 at the positions corresponding to the two vertical rods 2221. The two sliding grooves 234 are located on the same side edge of the mounting plate 231. Two abutting blocks 2321 are respectively provided at both ends of the fastening block 232. The fastener 233 can fasten the fastening block 232 to the mounting plate 231 so that the two abutting blocks 2321 respectively abut the two vertical rods 2221 into the corresponding sliding grooves 234.

[0036] Furthermore, the two vertical rods 2221 are arranged horizontally and parallel to each other, providing symmetrical vertical guide support for the mounting assembly 23. The measuring end of the noise meter 100 is aligned with the gap between the two vertical rods 2221 to avoid the vertical rods 2221 obstructing the measurement path and ensuring the integrity of sound wave reception. Two sliding grooves 234 are respectively opened on the mounting plate 231 at the positions corresponding to the two vertical rods 2221. Both sliding grooves 234 are located on the same edge of the mounting plate 231, allowing the mounting plate 231 to slide and engage with both vertical rods 2221 simultaneously, enhancing the balance and stability during the lifting process. Two abutment blocks 2321 are respectively provided at both ends of the fastening block 232. When the fastener 233 passes through the fastening block 232 and the mounting plate 231 and is fastened, the fastening block 232 moves towards the vertical rod 2221 under pressure, so that the two abutment blocks 2321 simultaneously press the two vertical rods 2221 against the inner wall of the corresponding slide groove 234, thereby realizing the synchronous locking of the mounting plate 231 and the double vertical rods 2221. When the fastener 233 is loosened, the abutment blocks 2321 separate from the vertical rods 2221, releasing the pressure on the vertical rods 2221, and the mounting plate 231 can slide smoothly along the double vertical rods 2221 to adjust the height. Through the cooperative structure of the double vertical rods 2221 and the double sliding grooves 234, the mounting plate 231 has no risk of deflection during the lifting process, and the guiding accuracy is significantly improved; the single fastener 233 controls the synchronous action of the two end abutment blocks 2321, which simplifies the operation steps, ensures that the pressure distribution of the two locking points is uniform, avoids the structural twisting or loosening problems that may occur with single-point locking, and improves the positional reliability of the mounting plate 231 after it is fixed.

[0037] In one embodiment, two limiting plates 2311 are connected to one side edge of the mounting plate 231 where the sliding groove 234 is provided. The two limiting plates 2311 and the mounting plate 231 together form a receiving groove 2312. Both sliding grooves 234 are connected to the receiving groove 2312. The fastening block 232 is located in the receiving groove 2312. The end of each limiting plate 2311 away from the mounting plate 231 is connected to a limiting block 2313. Each limiting block 2313 extends into the receiving groove 2312. The two limiting blocks 2313 on the two limiting plates 2311 are respectively provided for two abutting blocks 2321. Each limiting block 2313 can abut against the side of its corresponding abutting block 2321 away from the vertical rod 2221.

[0038] Furthermore, the two limiting plates 2311 and the mounting plate 231 together form a receiving groove 2312, providing a space for accommodating and protecting the fastening block 232. Both sliding grooves 234 are directly connected to the receiving groove 2312, allowing the fastening block 232 to be entirely disposed inside the receiving groove 2312. Two abutment blocks 2321 extending from both ends of the fastening block correspond to the positions of the two sliding grooves 234 and the vertical rod 2221, respectively. Each limiting block extends towards the interior of the receiving groove 2312 and corresponds to the positions of the fastener 233 and the abutment blocks 2321. The space of the receiving groove 2312 is slightly larger than the volume of the fastening block 232. When the fastener 233 is fastened to the mounting plate 231, the fastening block 232 drives the abutment block 2321 to press against the vertical rod 2221. The side of the fastening block 232 away from the abutment block 2321 disengages from the limiting block 2313. When the fastener 233 is loosened from the mounting plate 231, the fastening block 232 and the abutment block 2321 disengage from the vertical rod 2221. At this time, the limiting block 2313 can abut against the abutment block 2321 from the side of the abutment block 2321 away from the vertical rod 2221, thereby limiting the fastening block 232 in the receiving groove 2312 to protect the fastening block 232 and prevent the fastening block 232 from falling off.

[0039] In one embodiment, the fastener 233 is a fastening bolt, the fastening block 232 has a first threaded hole 2322 that mates with the fastening bolt, the first threaded hole 2322 is located between two abutment blocks 2321, and the mounting plate 231 has a second threaded hole that mates with the fastening bolt.

[0040] Understandably, when the fastening bolt is tightened, the bolt passes through the second threaded hole and the first threaded hole 2322 in sequence. The axial tension is generated through the thread engagement, causing the fastening block 232 to move towards the mounting plate 231. This causes the two end abutment blocks 2321 to simultaneously press the two vertical rods 2221 against the inner wall of the corresponding sliding groove 234, thus fixing the mounting plate 231 to the double vertical rods 2221. When the fastening bolt is loosened in the opposite direction, the thread engagement is released, the axial tension is released, the abutment block 2321 separates from the vertical rod 2221, and the mounting plate 231 can slide along the vertical rod 2221 to adjust its height again.

[0041] In one embodiment, the mounting plate 231 has mounting holes 236 for mounting the noise meter 100. It is understood that the noise meter 100 is mounted on the mounting plate 231 by screws or other connectors passing through the mounting holes 236, which facilitates the installation and removal of the noise meter 100.

[0042] In one embodiment, the outer wall of the guide rail 21 is provided with a plurality of scale markings 212 that are evenly distributed at intervals along the extension direction of the guide rail 21.

[0043] It can be explained that the outer wall of the guide rail 21 is provided with multiple scale marks 212 evenly distributed along the extension direction of the guide rail 21. When the base 221 of the bracket 22 slides horizontally along the guide groove 211 of the guide rail 21, the operator can directly read the precise displacement of the base 221 relative to the measuring point by observing the alignment position of the side of the base 221 with the scale marks 212 of the guide rail 21. This allows the operator to determine the horizontal distance between the noise measuring instrument 100 and the measuring point, achieving precise positioning without relying on external measuring tools, and significantly improving the position adjustment efficiency of the noise measuring instrument 100.

[0044] In one embodiment, the bottom of the mobile platform 10 is provided with wheels 11 equipped with brakes 12.

[0045] Understandably, the traveling wheel 11 is mounted on the bottom of the moving platform 10 via axle seats, and the brake 12 device is integrated into the axle seats of the traveling wheel 11. When the brake 12 is released, the traveling wheel 11 can roll freely, allowing the operator to push the moving platform 10 so that the intersection of the extension lines of the two guide rails 21 can be aligned with the exhaust pipe; when the brake 12 is applied, the brake 12 locks the rotation of the traveling wheel 11 through mechanical friction, preventing the moving platform 10 from being accidentally displaced during the measurement process and ensuring that the position of the noise measuring instrument 100 is fixed during the measurement process.

[0046] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. A noise measuring trolley for exhaust pipes, characterized in that, include: Mobile platform; Two positioning mechanisms are provided, each including a guide rail, a bracket, and a mounting assembly. The guide rail is horizontally mounted on the mobile platform, the bracket is connected to the guide rail and can slide horizontally along the guide rail, and the mounting assembly is mounted on the bracket and can slide vertically along the bracket. The mounting assembly has a mounting platform on which a noise meter for measuring the exhaust pipe noise is mounted. In the two positioning mechanisms, the extension directions of the two guide rails are perpendicular to each other, and the intersection of the extension lines of the two guide rails is located outside the mobile platform.

2. The exhaust pipe noise measuring trolley as described in claim 1, characterized in that, The guide rail has a guide groove that extends along the extension direction of the guide rail. The bracket includes a base and a frame. The base is slidably connected to the guide groove and can slide horizontally along the guide groove. The frame is mounted on the base and extends vertically. The mounting assembly is mounted on the frame and can slide vertically along the frame.

3. The exhaust pipe noise measuring trolley as described in claim 2, characterized in that, The guide groove includes an upper groove and a lower groove that are interconnected. The width of the upper groove is smaller than the width of the lower groove. The base includes an upper slider, a lower slider, and a connecting block. The connecting block is connected between the upper slider and the lower slider and forms an "I"-shaped structure with the upper slider and the lower slider. The lower slider extends into the lower groove and slides into the lower groove. The connecting block is located in the upper groove and slides into the upper groove. The upper slider is located outside the guide groove and can slide into the top of the guide groove.

4. The exhaust pipe noise measuring trolley as described in claim 2, characterized in that, The frame includes a vertically extending vertical rod, and the mounting assembly includes a mounting plate, a fastening block, and a fastener. A groove for the vertical rod to pass through is provided on one side edge of the mounting plate. An opening is formed on the side of the groove facing the edge of the mounting plate. The fastening block is located on one side of the opening. The fastener is detachably inserted into the fastener and the mounting plate, and the fastener can fasten the fastening block to the mounting plate so that the vertical rod is pressed against the groove by the fastening block. The upper surface of the mounting plate forms the mounting platform.

5. The exhaust pipe noise measuring trolley as described in claim 4, characterized in that, The number of vertical rods is two, and the two vertical rods are horizontally spaced to form a gap. The measuring end of the noise measuring instrument is set in the gap between the two vertical rods. The mounting plate has two sliding grooves respectively at the positions of the two vertical rods. The two sliding grooves are located on the same side edge of the mounting plate. Two abutment blocks are respectively provided at both ends of the fastening block. The fastener can fasten the fastening block to the mounting plate so that the two abutment blocks respectively abut the two vertical rods in the corresponding sliding grooves.

6. The exhaust pipe noise measuring trolley as described in claim 5, characterized in that, Two limiting plates are connected to one edge of the mounting plate where the sliding groove is provided. The two limiting plates and the mounting plate together form a receiving groove. Both sliding grooves are connected to the receiving groove. The fastening block is located in the receiving groove. The end of each limiting plate away from the mounting plate is connected to a limiting block. Each limiting block extends into the receiving groove. The two limiting blocks on the two limiting plates are respectively set to the two abutting blocks. Each limiting block can abut against the side of its corresponding abutting block away from the vertical rod.

7. The exhaust pipe noise measuring trolley as described in claim 5, characterized in that, The fastener is a fastening bolt, and the fastening block has a first threaded hole that mates with the fastening bolt. The first threaded hole is located between the two abutment blocks, and the mounting plate has a second threaded hole that mates with the fastening bolt.

8. The exhaust pipe noise measuring trolley as described in claim 4, characterized in that, The mounting plate has mounting holes for mounting the noise measuring instrument.

9. The noise measuring trolley for exhaust pipes as described in any one of claims 1 to 8, characterized in that, The outer wall of the guide rail is provided with a plurality of scale markings evenly distributed along the extension direction of the guide rail.

10. The noise measuring trolley for exhaust pipes as described in any one of claims 1 to 8, characterized in that, The mobile platform is equipped with braked wheels at its bottom.

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