CN110031239B - Adjustable test bed for testing performance of automobile muffler - Google Patents
Adjustable test bed for testing performance of automobile muffler Download PDFInfo
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- CN110031239B CN110031239B CN201910326384.9A CN201910326384A CN110031239B CN 110031239 B CN110031239 B CN 110031239B CN 201910326384 A CN201910326384 A CN 201910326384A CN 110031239 B CN110031239 B CN 110031239B
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- 238000012360 testing method Methods 0.000 title claims abstract description 71
- 230000007246 mechanism Effects 0.000 claims abstract description 103
- 238000000034 method Methods 0.000 claims abstract description 26
- 230000000087 stabilizing effect Effects 0.000 claims description 49
- 239000010985 leather Substances 0.000 claims description 17
- 238000005192 partition Methods 0.000 claims description 15
- 230000003139 buffering effect Effects 0.000 claims description 13
- 238000010521 absorption reaction Methods 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000009434 installation Methods 0.000 claims description 7
- 230000003584 silencer Effects 0.000 claims description 7
- 238000011056 performance test Methods 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 abstract description 13
- 238000001514 detection method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 6
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000011089 mechanical engineering Methods 0.000 abstract description 2
- 238000011160 research Methods 0.000 abstract description 2
- 230000001276 controlling effect Effects 0.000 description 35
- 238000010586 diagram Methods 0.000 description 11
- 238000002474 experimental method Methods 0.000 description 9
- 244000309464 bull Species 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000030279 gene silencing Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention relates to an adjustable test bed for testing the performance of an automobile muffler, which belongs to the technical field of mechanical engineering, adopts a reasonable method and mechanism to ensure the high efficiency of the test, and can realize the test of sample pieces with different sizes through a lifting mechanism I, a movable sliding table J, a movable positioning and clamping mechanism K, a platform rotating mechanism L and a lifting platform M without re-constructing the test bed; the platform rotating mechanism L enables the transmission loss measurement by the two sound source method to be more efficient; meanwhile, the design is given to the detection of the muffler air outlet with the bent angle, and the problem of detecting the muffler air outlet with the bent angle is solved through the tailstock rotating mechanism Q. The invention makes the muffler test more convenient and efficient, the test process is stable and reliable, can realize the muffler performance index detection of different sizes and shapes, the test process is convenient and quick, the research cost and unnecessary time are reduced, and the invention can also provide reference for the muffler test production line.
Description
Technical Field
The invention belongs to the technical field of mechanical engineering, and particularly relates to an adjustable test bed for testing the performance of an automobile muffler, which can simulate the exhaust states of an engine under different working conditions and acquire data.
Background
The automobile muffler is used as an important part of an automobile, so that noise generated by an automobile engine is reduced to a certain extent. Tests are needed to be carried out during the study and design of the muffler to test whether various performance indexes of the newly developed muffler can meet the design requirements, and although a lot of simulation software is presented at present, a lot of boundary conditions still exist and come in and go out from reality, so that the test study is needed. The performance study of the muffler involves a large number of instruments including various sensors, various test principles and methods, and requirements for tail end total sound absorption. The test bed is installed and built, so that researchers are time-consuming and labor-consuming, and the test bed is built again after measurement, and the efficiency is low. The invention adopts reasonable method and mechanism to ensure the high efficiency of test, can realize the test of samples with different sizes without re-constructing a test bed, and realizes automation of part of structures, so that the test process is convenient and quick, stable and reliable, the research cost and unnecessary time waste are reduced, and a certain reference is provided for the detection production line of muffler production.
Disclosure of Invention
In order to meet the requirements, the time and the cost of the experimental installation workbench are reduced, and the purpose of the invention is to provide the test bench for testing the performance of the silencer, which is high in automation degree and reliability.
The invention comprises an anechoic chamber A, a pressure control valve B, a pressure temperature display touch panel C, a computer D, a signal receiver E, a gas-dividing flow and noise generating device I, a muffler mounting platform II and an adjustable tailstock mechanism III, wherein the inner wall of the anechoic chamber A is fixedly connected with a sound absorbing plate 90; the pressure control valve B is fixedly connected to the top of the right side of the non-sound-return chamber A; the pressure temperature display touch panel C is fixedly connected to the upper part of the right side of the front surface of the sound-free chamber A; the computer D, the signal receiver E, the airflow generating device F of the airflow dividing and noise generating device I are arranged outside the anechoic room A; the front end of the signal receiver E is connected with a sensor a17, a sensor b18, a sensor c20 and a sensor d21 of the muffler mounting platform II; the rear end of the signal receiver E is connected with a computer D; the noise generating device G and the airflow stabilizing and temperature controlling device H of the airflow dividing and noise generating device I are arranged in the anechoic chamber A; the pipeline a6 of the air-separating and noise generating device I passes through the left side wall of the anechoic chamber A and is communicated with the left side wall of the air-stabilizing and temperature-controlling device H, and the bottom of the bracket b15 of the air-stabilizing and temperature-controlling device H is fixedly connected with the lower bottom plate 96 of the adjustable tailstock mechanism III; the noise generating device G is fixedly connected to the left side of the airflow stabilizing and temperature controlling device H and is communicated with the airflow stabilizing and temperature controlling device H through a rectangular hole 8; the pipeline b12 of the gas-dividing and noise generating device I is communicated with the right side wall of the gas-dividing and noise-generating device H, the middle lower part of the pipeline b12 of the gas-dividing and noise-generating device I is fixedly connected with the supporting rod 13, the bottom of the supporting rod 13 is fixedly connected with the lower bottom plate 96 of the adjustable tailstock mechanism III, and the right end of the pipeline b12 of the gas-dividing and noise-generating device I is fixedly connected with the gas inlet of the muffler 19 arranged on the movable positioning and clamping mechanism K through the percutaneous pipe b 22; the upper end of the lifting mechanism I of the muffler mounting platform II is fixedly connected with a single-rod cylinder rod 67 on a connecting plate b59 of the muffler mounting platform II, and the lower end of the lifting mechanism I of the muffler mounting platform II is fixedly connected with a lower bottom plate 96 through a connecting plate a 57; the left percutaneous tube b22 of the pipeline c74 in the adjustable tailstock mechanism III is fixedly connected with the air outlet of the muffler 19, and the lower part of the pipeline c74 in the adjustable tailstock mechanism III is fixedly connected with the movable sliding table IIN through a workbench 83; the lower part of the movable slipway IIN is fixedly connected with the lifting platform M; the clamping manipulator O is arranged on the right side of the movable sliding table II N and is movable above the lower bottom plate 96 of the adjustable tailstock mechanism III; the bottom plate bracket P is fixedly connected below a bottom plate 96 of the adjustable tailstock mechanism III; the tailstock rotating mechanism Q is connected with the upper lifting platform M through the roller 87, and the lower end of the tailstock rotating mechanism Q is fixedly connected with the lower bottom plate 96 of the adjustable tailstock mechanism III through the track bracket 81.
The air flow dividing and noise generating device I consists of an air flow generating device F, a noise generating device G and an air flow stabilizing and temperature controlling device H, wherein the air flow generating device F consists of a bracket a1, a mounting plate a2, a fan 3, a pipeline interface 4, a variable frequency speed regulator 5 and a pipeline a6, the bottom of the bracket a1 is connected with the ground, the fan 3 is fixedly connected to the mounting plate a2 above the bracket a1, the fan 3 is provided with the variable frequency speed regulator 5, an outlet of the fan 3 is connected with an inlet of the pipeline a6 through the pipeline interface 4, an outlet of the pipeline a6 is connected with the front part of the air flow stabilizing and temperature controlling device H, and the rear part of the air flow stabilizing and temperature controlling device H is fixedly connected with the right end of the noise generating device G; the air flow stabilizing and temperature controlling device H consists of a cover plate 7, a rectangular hole 8, a rectangular partition plate 9, a heating device 10, an orifice plate flowmeter 11, a pipeline b12, a supporting rod 13, a mounting plate b14 and a bracket b15, wherein the rectangular hole 8 is formed in the rear part of the air flow stabilizing and temperature controlling device H, the rectangular partition plate 9 is arranged in the middle of the air flow stabilizing and temperature controlling device H, round sieve holes are formed in the rectangular partition plate 9, the heating device 10 is arranged on the rectangular partition plate 9, the cover plate 7 above the air flow stabilizing and temperature controlling device H is detachable, the orifice plate flowmeter 11 is fixedly connected to the near right end of the pipeline b12, the supporting rod 13 is fixedly connected to the lower part of the middle of the pipeline b12, the air flow stabilizing and temperature controlling device H is fixedly connected to the mounting plate b14 of the bracket b15, and the right end of the pipeline b12 is communicated with the rear left part of the air flow stabilizing and temperature controlling device H; the noise generating device G is fixedly connected to the left side of the airflow stabilizing and temperature controlling device H and is communicated with the airflow stabilizing and temperature controlling device H through a rectangular hole 8.
The silencer mounting platform II consists of a lifting mechanism I, a movable sliding table I J, a movable positioning clamping mechanism K and a platform rotating mechanism L, wherein the lifting mechanism I consists of a guide rod 56, a connecting plate a57, a guide sleeve 58, a connecting plate b59, a single rod air cylinder rod 67, a motor 68, a single rod air cylinder 69, a hole group a70, a hole group b71, an insert 72 and a central hole 73, the single rod air cylinder 69 is fixedly connected below the connecting plate a57, the single rod air cylinder rod 67 penetrates through the connecting plate a57, the upper part of the guide rod 56 is fixedly connected with the connecting plate b59, the upper end of the guide sleeve 58 is fixedly connected with the connecting plate b59, the lower end of the guide sleeve is fixedly connected with the connecting plate a57, and the connecting plate a57 is provided with the insert 72, the hole group a70 of the single rod air cylinder rod (67) and the central hole 73; the movable sliding table I J consists of a mounting plate g53, a ball screw a54 and a stepping motor a 55; the mounting plate g53 is fixedly connected with the upper mounting plate e47, and the stepping motor a55 is connected with the ball screw a54; the movable slipway I J is fixedly connected below the movable positioning and clamping mechanism K through a mounting plate g 53; the movable positioning and clamping mechanism K consists of a leather hose a16, a sensor a17, a sensor b18, a muffler 19, a sensor c20, a sensor d21, a leather hose b22, a test hose a23, a pipe joint a24, a U-shaped pipe 25, a pipe joint b26, a clamping 27, a test hose b28, a bracket c29, a bolt a30, a bolt b31, a support a32, an oil cylinder a33, an oil cylinder b34, a V-shaped block a35, a sliding rail a36, a sliding block a37, a support b38, an oil cylinder c39, a V-shaped block b40, a double-rod cylinder 41, a double-rod cylinder rod 42, a mounting plate c43, a mounting plate d44, a sliding rail b45, a sliding block b46, a mounting plate e47, a clamping oil cylinder 48, a mounting plate f49, an oil cylinder d50, a rectangular groove a51 and a rectangular groove b52, and the pipeline b12 is connected with an air inlet leather hose a16 of the muffler 19; the air outlet of the muffler 19 is connected with a pipeline c74 through a percutaneous tube b 22; a sensor a17, a sensor b18 and a test tube a23 are arranged at the air inlet of the muffler 19, and a sensor c20, a sensor d21 and a test tube b28 are arranged at the outlet of the muffler 19; the other ends of the test tube a23 and the test tube b28 are respectively connected with a U-shaped tube 25 through a joint a24 and a tube joint b26, the U-shaped tube 25 is fixedly connected to a clamping clip 27, the clamping clip 27 is fixedly connected with a bracket c29, the bracket c29 is fixedly connected to a mounting plate e47 through a bolt a30 and a bolt b31, and the muffler 19 is positioned by a V-shaped block a35 and a V-shaped block b 40; the lower end of the V-shaped block a35 is fixedly connected with an oil cylinder a33 and an oil cylinder b34, and the oil cylinder a33 and the oil cylinder b34 are fixedly connected in a rectangular groove a51 of the support a 32; the V-shaped block b40 is fixedly connected with the oil cylinder c39, the oil cylinder c39 is fixedly connected in a rectangular groove b52 of the support b38, the support b38 is fixedly connected with the slide block a37 and the slide block b46, the slide block a37 is matched with the slide rail a36, the slide block b46 is matched with the slide rail b45, the right side of the support b38 is fixedly connected with the double-rod air cylinder 41, the double-rod air cylinder rod 42 is connected with the mounting plate c43, the mounting plate c43 is fixedly connected on the mounting plate d44, the mounting plate d44 is fixedly connected with the mounting plate e47, the clamping oil cylinder 48 is arranged on the mounting plate f49, the mounting plate f49 is fixedly connected with the oil cylinder d50, the oil cylinder d50 is fixedly connected with the mounting plate e47, the mounting plate e47 is fixedly connected with the mounting plate g53, and the mounting plate g53 is fixedly connected with the movable sliding table IJ; the platform rotating mechanism L consists of a connecting plate c60, a fixed block 61, a bolt c62, a buffering limiting pin 63, a mounting block 64, a pinion 65, a large gear 66 and a motor 68, wherein the motor 68 in the platform rotating mechanism L is fixedly connected to the connecting plate b 59; pinion 65 meshes with bull gear 66; the large gear 66 is fixedly connected with the connecting plate c 60; the fixed block 61 is fixedly connected to the bottom of the connecting plate c60, the mounting block 64 is fixedly connected to the connecting plate b59, the bolt c62 and the buffering limiting pin 63 are mounted on the mounting block 64, the bolt c62, the buffering limiting pin 63 and the mounting block 64 are symmetrically mounted on two sides of the large gear 66 and fixedly connected to the bottom of the connecting plate c 60; the platform rotating mechanism L is fixedly connected below the movable sliding table IJ through a connecting plate c 60.
The adjustable tailstock mechanism III consists of a lifting platform M, a movable sliding table II N, a clamping manipulator O, a bottom plate bracket P and a tailstock rotating mechanism Q, wherein the lifting platform M consists of an upper plate 76, a hydraulic cylinder 77, a sliding plate 78, a base 79, a roller 87, a connecting block 88 and a connecting plate d89, the lower end of the upper plate 76 is hinged with the hydraulic cylinder 77, the lower end of the hydraulic cylinder 77 is fixedly connected with the sliding plate 78, the sliding plate 78 is in matched connection with the base 79, the lower end of the base 79 is fixedly connected with the connecting plate d89, the lower part of the connecting plate d89 is hinged with the connecting block 88, the connecting block 88 is hinged with the roller 87, and the roller 87 is matched with the annular track 80; the movable sliding table IIN consists of a pipeline c74, a support c82, a workbench 83, a mounting plate h84, a stepping motor b85 and a ball screw b86, wherein an outlet of the muffler 19 is fixedly connected with the pipeline c74 through a leather pipe b22, the lower half part of the pipeline c74 is fixedly connected with the support c82, the lower end of the support c82 is fixedly connected with the workbench 83, the workbench 83 is fixedly connected with the lower movable sliding table IIN through the mounting plate h84, and the stepping motor b85 is connected with the ball screw b86; the clamping manipulator O consists of a full sound absorption tail end 75, a sensor bracket 91, a manipulator head 92, a connecting rod a93 and a connecting rod b94, wherein the clamping manipulator O is vertically fixedly connected with the connecting rod b94 through the connecting rod a93, the manipulator head 92 is fixedly connected with the tail end of the connecting rod a93, the sensor bracket 91 is arranged on the right side of a pipeline c74, an included angle alpha between the sensor bracket 91 and an axis at the outlet of the right end of the pipeline c74 is 45 degrees, and a spacing L is 500mm; the bottom plate bracket P consists of a trundle 95, a bottom plate 96, an embedded groove 97 and a rectangular groove 98, wherein the bottom plate 96 is fixedly connected to the bottom plate bracket P, the bottom plate 96 is provided with the embedded groove 97 and the rectangular groove 98, the lower part of the bottom plate bracket P is fixedly connected with the trundle 95, and the upper part of the bottom plate bracket P is fixedly connected with the bottom plate 96; the tailstock rotating mechanism Q consists of an annular track 80, a track bracket 81, a roller 87, a connecting block 88 and a connecting plate d89, wherein the lower part of the connecting plate d89 is hinged with the connecting block 88, the connecting block 88 is hinged with the roller 87, the roller 87 is connected with the annular track 80 in a matched manner, and the annular track 80 is fixedly connected with the upper part of the track bracket 81.
The working process and principle of the invention are as follows:
1. the power is turned on, the computer D is started, the devices are ready for operation, the anechoic chamber a is opened, and the muffler 19 is placed on the mobile positioning and clamping mechanism K.
2. The muffler mounting platform is controlled to work, the air inlet of the muffler 19 exceeds the left end face of the V-shaped block a35 by a certain distance, the leather hose a16 is convenient to mount, the support b38 is driven to move left and right by the telescopic action of the double-rod air cylinder rod 42, the V-shaped block b40 is driven to move left and right, and when the length of the muffler 19 changes, the air outlet of the muffler 19 is positioned by adjusting the position of the V-shaped block b 40; the oil cylinder a33 and the oil cylinder b34 are used for controlling the V-shaped block a35 to move up and down and positioning the air inlet of the muffler 19 in the vertical direction; the oil cylinder c39 is used for controlling the V-shaped block b40 to move up and down and positioning the air outlet of the muffler 19 in the vertical direction; after the positioning is finished, the muffler 19 is clamped by the clamping oil cylinder 48, and the oil cylinder d50 enables the clamping oil cylinder 48 to have a larger lifting function, so that the muffler with a larger diameter can be clamped; the positioning and clamping of the muffler 19 is to avoid unnecessary vibration noise generated by the muffler, so that the test measurement result is more accurate.
3. After the muffler 19 is positioned and clamped, the lifting mechanism I starts to work, and moves in the guide sleeve 58 through the single-rod cylinder rod 67 to push the connecting plate b59 to drive the sliding table IJ, the movable positioning and clamping mechanism K and the platform rotating mechanism L to move up and down integrally above the connecting plate b59, so that the air inlet of the muffler 19 is aligned with the vertical direction of the pipeline b 12; the movable sliding table I J starts to work, and the movable sliding table I J drives the ball screw a54 through the stepping motor a55 so as to drive the upper mounting plate g53 to move back and forth, so that the pipeline b12 is communicated with the leather hose a16 arranged on the air inlet of the muffler 19; when the two sound source method measures the transmission loss, the platform rotating mechanism L moves to drive the pinion 65 to rotate through a series of transmission mechanisms by the motor 68, then drives the connecting plate c60, and then drives the upper moving sliding table IJ and the positioning and clamping mechanism K to integrally move, when the mounting plate rotates anticlockwise by 180 degrees, the bolt c62 prevents the fixed block 61 from continuing to move, so that the connecting plate c60 is prevented from continuing to rotate, and the buffering limiting pin 63 plays a role in buffering; similarly, when the connecting plate c60 rotates 180 degrees clockwise, the bolt c62 prevents the fixing block 61 from moving continuously, so that the connecting plate c60 is prevented from rotating continuously, and the buffering limiting pin 63 plays a buffering role.
4. The lifting mechanism I is connected below the movable sliding table IIN to move up and down, the upper plate 76 is driven to move up and down, so that the pipeline c74 is connected with the outlet of the muffler 19, and when the muffler with different inlets and outlets appears, the test bed does not need to be built again; the lower part of the workbench 83 is connected with a movable sliding table IIN, and the movable sliding table IIN drives a ball screw b86 through a stepping motor b85, so that the workbench 83 is driven to move left and right, and then the pipeline c74 is driven to move left and right so as to adapt to the length change of the muffler 19, and when the muffler 19 is lengthened, the pipeline c74 moves rightwards; as the muffler length shortens, the conduit c74 moves to the left; the rollers 87 cooperate with the annular track 80 to effect movement of the mechanism on the annular track 80 to effect connection with the conduit c74 when the muffler 19 outlet is angled to accommodate acoustic performance measurements of muffler outlets with different degrees of curvature.
5. When the tail end boundary condition is the full sound absorption tail end, the full sound absorption tail end 75 is connected with the air outlet at the rear end of the pipeline c74 through the clamping manipulator 0; when the transmission loss is measured by adopting the double-load method, the clamping manipulator 0 can carry out tail end load replacement, the connecting rod a93 of the clamping manipulator 0, the connecting rod b94 can carry out left and right body length or shortening and height adjustment, and the manipulator head 92 can be opened and closed to realize grabbing and clamping. Telescoping and rotation between the individual bars of the sensor holder 91 can be achieved. The sensor holder 91 is used to measure the insertion loss of the muffler 19.
6. Closing the anechoic chamber A, and adjusting the pressure and the temperature in the anechoic chamber A through a pressure and temperature display touch panel C, wherein the real-time pressure and the temperature are displayed on the pressure and temperature display touch panel C, so that the total indoor working pressure and the indoor working temperature can be kept constant, and meanwhile, the exhaust gas at the tail end of a pipeline is ensured not to influence the indoor whole environment; in addition, according to the test requirement, if the indoor temperature and pressure are required to be changed, the pressure and temperature display touch panel C can be used for adjusting. The sound absorbing plate 90 is arranged on the inner wall of the anechoic chamber A, so that anechoic chamber A is ensured to have no echo and isolate external sound.
7. After the pressure and the temperature in the non-sound-return chamber A are stabilized, starting an airflow generating device F, starting the operation of a fan 3, placing the fan 3 outside the non-sound-return chamber A so as to prevent noise generated by the fan from influencing a test, enabling generated airflow to enter an airflow stabilizing and temperature controlling device H through a pipeline a6, enabling the airflow in the airflow stabilizing and temperature controlling device H to pass through a rectangular partition 9, installing a heating device 10 on the rectangular partition 9, controlling the resistance of an access resistor of the heating device 10 through a computer D to heat the airflow to different temperatures, enabling a cover plate 7 above the airflow stabilizing and temperature controlling device H to be detachable, facilitating the installation and maintenance of internal parts, enabling the noise generating device G to generate simulated noise, enabling the generated noise to pass through a rectangular hole 8 so as to enable the noise generating device G to generate the simulated noise to propagate forwards and simulate the exhaust noise of an engine, and enabling the noise generating device G to be only opened when the fan 3 is not rotated, so that the experiment in a non-airflow state can be realized; the fan 3 is not rotated, the noise generating device G is turned on, and the heating device 10 is turned on at the same time, so that an experiment of the influence of the temperature on the performance of the muffler 19 when no air flow exists can be performed; the fan 3 is turned on, the air flow is introduced, the air flow can be regulated through the variable frequency speed regulator 5, the orifice plate flowmeter 11 is used for detecting parameters such as the flow, the temperature, the pressure and the like of the air flow at the inlet of the pipeline b12, and whether the detected parameters reach the required values or not is detected. The air flow and the simulated noise are transmitted to the air inlet of the muffler 19 through the pipeline b12, transmitted to the pipeline c74 through the air outlet of the muffler 19, and transmitted to the full sound absorption tail end 75 through the pipeline c74; the muffler 19 is provided with four sensors and two test tubes, the other ends of the four sensors are connected with a signal receiver E for measuring transmission loss (here, a four-point method is taken as an example, a specific experimental method is determined according to researchers, and the intervals among the sensors and the installation positions are also determined according to the specific experimental requirements of the researchers); the other section of the test tube is connected to a U-tube 25 for measuring back pressure.
The invention has the beneficial effects that: the silencer performance index detection device has the advantages that the silencer performance index detection device is more convenient and efficient in experimental detection, reliable and stable in experimental process, and can realize detection of silencer performance indexes of different sizes and shapes, and the cost of manpower, material resources and time is low.
Drawings
FIG. 1 is a front view of an adjustable test stand for testing the performance of an automotive muffler
FIG. 2 is a schematic diagram of the internal structure of an adjustable test stand for testing the performance of an automotive muffler
FIG. 3 is an isometric view of the internal structure of an adjustable test stand for testing the performance of an automotive muffler
FIG. 4 is a schematic diagram of a split-flow and noise generating device I
FIG. 5 is a schematic view of the movable sliding table IJ and the movable positioning and clamping mechanism K (I)
FIG. 6 is a schematic diagram of the movable sliding table IJ and the movable positioning and clamping mechanism K (II)
FIG. 7 is a schematic view of a U-shaped tube mounting structure
FIG. 8 is a schematic view of a U-shaped tube support structure
Fig. 9 is a schematic structural view of the movable positioning and clamping mechanism K
FIG. 10 is a schematic view of a clamping cylinder
FIG. 11 is a schematic diagram of a rectangular groove structure
FIG. 12 is a schematic diagram of a rectangular groove structure (II)
FIG. 13 is a schematic view showing the structure of the movable slipway IJ
FIG. 14 is a schematic view of a muffler mounting platform rotation L and a lift I (one)
FIG. 15 is a schematic view of a muffler mounting platform rotation L and a lift I (II)
FIG. 16 is a schematic view of a structure of a connection plate a
FIG. 17 is a schematic view of a tailstock movement mechanism (I)
FIG. 18 is a schematic view of a tailstock movement mechanism (II)
FIG. 19 is a schematic view of a sound absorber structure
FIG. 20 is a schematic view of a sensor support structure
FIG. 21 is a schematic view of a clamping robot O configuration
Fig. 22 is a schematic view of the installation of the floor bracket P
FIG. 23 is a schematic view of a subfloor structure
FIG. 24 is a schematic view of a floor bracket structure
FIG. 25 is an isometric view of a muffler mounting platform tailstock rotated
FIG. 26 is a top view of the muffler mounting platform tailstock after rotation
FIG. 27 is a schematic diagram of the pulse method test
FIG. 28 is a schematic diagram of an experiment applied to an experiment using an acoustic decomposition method
FIG. 29 is a schematic diagram of an experiment in which the two-source method is applied
FIG. 30 is a schematic diagram of an experiment conducted by the two-source method (II)
FIG. 31 is a schematic diagram of an experiment applied to the test by the two-load method (one)
FIG. 32 is a schematic diagram of an experiment conducted by the two-load method (II)
FIG. 33 is a schematic view of a muffler with an inlet and an outlet that are not coaxial
Wherein: A. the device comprises a sound-returning chamber B, a pressure control valve C, a pressure temperature display touch panel D, a computer E, a signal receiver F, an airflow generating device G, a noise generating device H, an airflow stabilizing and temperature controlling device I, a lifting mechanism J, a moving sliding table IK, a moving positioning and clamping mechanism L, a platform rotating mechanism M, a lifting platform N, a moving sliding table II O, a clamping manipulator P, a bottom plate bracket Q, a tail seat rotating mechanism I, a gas-separating and noise generating device II, a muffler mounting platform III, an adjustable tail seat mechanism 1, a support a2, a mounting plate a3, a fan 4, a pipeline interface 5, a variable-frequency speed regulator 6, a pipeline a7, a cover plate 8, a rectangular hole 9, a rectangular partition plate 10, a heating device 11, a pore plate flowmeter 12, a pipeline b 13 and a supporting rod 14. Mounting plate b15, bracket b 16, leather hose a17, sensor a 18, sensor b 19, muffler 20, sensor c 21, sensor d 22, leather hose b 23, test hose a24, pipe joint a 25, U-shaped hose 26, pipe joint b 27, clip 28, test hose b 29, bracket c 30, bolt a 31, bracket a33, cylinder a 34, cylinder b 35, V-block a36, slide rail a37, slide block a 38, bracket b 39, cylinder c 40, V-block b 41, double-rod cylinder 42, double-rod cylinder rod 43, mounting plate c 44, mounting plate d 45, slide rail b46, slide block b 47, mounting plate e 48, clamp cylinder 49, mounting plate f 50, cylinder d 51, rectangular groove a 52, rectangular groove b 53, mounting plate g 54, ball screw a55, stepper motor a 56, guide rod 57 Plate a 58, guide sleeve 59, connecting plate b 60, connecting plate c 61, fixed block 62, bolt c 63, buffer stop 64, mounting block 65, pinion 66, large gear 67, single rod cylinder 68, motor 69, single rod cylinder 70, hole set a 71, hole set b 72, insert 73, center hole 74, conduit c 75, full sound absorbing tail 76, upper plate 77, hydraulic cylinder 78, slide 79, base 80, annular track 81, track bracket 82, support c 83, table 84, mounting plate h 85, stepper motor b86, ball screw b 87, roller 88, connecting block 89, connecting plate d 90, sound absorbing plate 91, sensor bracket 92, manipulator head 93, connecting rod a 94, connecting rod b 95, caster 96, lower plate 97, insert groove 98, rectangular groove
Detailed Description
As shown in fig. 1 to 3, 19, 25 and 26, the invention consists of an anechoic chamber a, a pressure control valve B, a pressure temperature display touch panel C, a computer D, a signal receiver E, a gas-dividing flow and noise generating device i, a muffler mounting platform ii and an adjustable tailstock mechanism iii, wherein the inner wall of the anechoic chamber a is fixedly connected with an acoustic board 90; the pressure control valve B is fixedly connected to the top of the right side of the non-sound-return chamber A; the pressure temperature display touch panel C is fixedly connected to the upper part of the right side of the front surface of the sound-free chamber A; the computer D, the signal receiver E, the airflow generating device F of the airflow dividing and noise generating device I are arranged outside the anechoic room A; the front end of the signal receiver E is connected with a sensor a17, a sensor b18, a sensor c20 and a sensor d21 of the muffler mounting platform II; the rear end of the signal receiver E is connected with a computer D; the noise generating device G and the airflow stabilizing and temperature controlling device H of the airflow dividing and noise generating device I are arranged in the anechoic chamber A; the pipeline a6 of the air-separating and noise generating device I passes through the left side wall of the anechoic chamber A and is communicated with the left side wall of the air-stabilizing and temperature-controlling device H, and the bottom of the bracket b15 of the air-stabilizing and temperature-controlling device H is fixedly connected with the lower bottom plate 96 of the adjustable tailstock mechanism III; the noise generating device G is fixedly connected to the left side of the airflow stabilizing and temperature controlling device H and is communicated with the airflow stabilizing and temperature controlling device H through a rectangular hole 8; the pipeline b12 of the gas-dividing and noise generating device I is communicated with the right side wall of the gas-dividing and noise-generating device H, the middle lower part of the pipeline b12 of the gas-dividing and noise-generating device I is fixedly connected with the supporting rod 13, the bottom of the supporting rod 13 is fixedly connected with the lower bottom plate 96 of the adjustable tailstock mechanism III, and the right end of the pipeline b12 of the gas-dividing and noise-generating device I is fixedly connected with the gas inlet of the muffler 19 arranged on the movable positioning and clamping mechanism K through the percutaneous pipe b 22; the upper end of the lifting mechanism I of the muffler mounting platform II is fixedly connected with a single-rod cylinder rod 67 on a connecting plate b59 of the muffler mounting platform II, and the lower end of the lifting mechanism I of the muffler mounting platform II is fixedly connected with a lower bottom plate 96 through a connecting plate a 57; the left percutaneous tube b22 of the pipeline c74 in the adjustable tailstock mechanism III is fixedly connected with the air outlet of the muffler 19, and the lower part of the pipeline c74 in the adjustable tailstock mechanism III is fixedly connected with the movable sliding table IIN through a workbench 83; the lower part of the movable slipway IIN is fixedly connected with the lifting platform M; the clamping manipulator O is arranged on the right side of the movable sliding table II N and is movable above the lower bottom plate 96 of the adjustable tailstock mechanism III; the bottom plate bracket P is fixedly connected below a bottom plate 96 of the adjustable tailstock mechanism III; the tailstock rotating mechanism Q is connected with the upper lifting platform M through the roller 87, and the lower end of the tailstock rotating mechanism Q is fixedly connected with the lower bottom plate 96 of the adjustable tailstock mechanism III through the track bracket 81.
As shown in fig. 4, the airflow and noise generating device i is composed of an airflow generating device F, a noise generating device G, and an airflow stabilizing and temperature controlling device H, wherein the airflow generating device F is composed of a bracket a1, a mounting plate a2, a fan 3, a pipeline interface 4, a variable frequency speed regulator 5, and a pipeline a6, the bottom of the bracket a1 is connected with the ground, the fan 3 is fixedly connected to the mounting plate a2 above the bracket a1, the fan 3 is provided with the variable frequency speed regulator 5, the outlet of the fan 3 is connected with the inlet of the pipeline a6 through the pipeline interface 4, the outlet of the pipeline a6 is connected with the front part of the airflow stabilizing and temperature controlling device H, and the rear part of the airflow stabilizing and temperature controlling device H is fixedly connected with the right end of the noise generating device G; the air flow stabilizing and temperature controlling device H consists of a cover plate 7, a rectangular hole 8, a rectangular partition plate 9, a heating device 10, an orifice plate flowmeter 11, a pipeline b12, a supporting rod 13, a mounting plate b14 and a bracket b15, wherein the rectangular hole 8 is formed in the rear part of the air flow stabilizing and temperature controlling device H, the rectangular partition plate 9 is arranged in the middle of the air flow stabilizing and temperature controlling device H, round sieve holes are formed in the rectangular partition plate 9, the heating device 10 is arranged on the rectangular partition plate 9, the cover plate 7 above the air flow stabilizing and temperature controlling device H is detachable, the orifice plate flowmeter 11 is fixedly connected to the near right end of the pipeline b12, the supporting rod 13 is fixedly connected to the lower part of the middle of the pipeline b12, the air flow stabilizing and temperature controlling device H is fixedly connected to the mounting plate b14 of the bracket b15, and the right end of the pipeline b12 is communicated with the rear left part of the air flow stabilizing and temperature controlling device H; the noise generating device G is fixedly connected to the left side of the airflow stabilizing and temperature controlling device H and is communicated with the airflow stabilizing and temperature controlling device H through a rectangular hole 8.
As shown in fig. 5 to 16 and 33, the muffler mounting platform ii is composed of a lifting mechanism I, a movable sliding table ij, a movable positioning and clamping mechanism K and a platform rotating mechanism L, wherein the lifting mechanism I is composed of a guide rod 56, a connecting plate a57, a guide sleeve 58, a connecting plate b59, a single rod cylinder rod 67, a motor 68, a single rod cylinder 69, a hole group a70, a hole group b71, an insert 72 and a central hole 73, the single rod cylinder 69 is fixedly connected below the connecting plate a57, the single rod cylinder rod 67 penetrates through the connecting plate a57, the guide rod 56 is fixedly connected with the connecting plate b59 above, the upper end of the guide sleeve 58 is fixedly connected with the connecting plate b59, the lower end of the guide sleeve is fixedly connected with the connecting plate a57, and the connecting plate a57 is provided with the insert 72 and the hole group a70 of the guide rod 56, the hole group b71 of the single rod cylinder rod (67) and the central hole 73; the movable sliding table I J consists of a mounting plate g53, a ball screw a54 and a stepping motor a 55; the mounting plate g53 is fixedly connected with the upper mounting plate e47, and the stepping motor a55 is connected with the ball screw a54; the movable slipway I J is fixedly connected below the movable positioning and clamping mechanism K through a mounting plate g 53; the movable positioning and clamping mechanism K consists of a leather hose a16, a sensor a17, a sensor b18, a muffler 19, a sensor c20, a sensor d21, a leather hose b22, a test hose a23, a pipe joint a24, a U-shaped pipe 25, a pipe joint b26, a clamping 27, a test hose b28, a bracket c29, a bolt a30, a bolt b31, a support a32, an oil cylinder a33, an oil cylinder b34, a V-shaped block a35, a sliding rail a36, a sliding block a37, a support b38, an oil cylinder c39, a V-shaped block b40, a double-rod cylinder 41, a double-rod cylinder rod 42, a mounting plate c43, a mounting plate d44, a sliding rail b45, a sliding block b46, a mounting plate e47, a clamping cylinder 48, a mounting plate f49, an oil cylinder d50, a rectangular groove a51 and a rectangular groove b52, and the pipeline b12 is connected with an air inlet leather hose a16 of the muffler 19; the air outlet of the muffler 19 is connected with a pipeline c74 through a percutaneous tube b 22; a sensor a17, a sensor b18 and a test tube a23 are arranged at the air inlet of the muffler 19, and a sensor c20, a sensor d21 and a test tube b28 are arranged at the outlet of the muffler 19; the other ends of the test tube a23 and the test tube b28 are respectively connected with a U-shaped tube 25 through a joint a24 and a tube joint b26, the U-shaped tube 25 is fixedly connected to a clamping clip 27, the clamping clip 27 is fixedly connected with a bracket c29, the bracket c29 is fixedly connected to a mounting plate e47 through a bolt a30 and a bolt b31, and the muffler 19 is positioned by a V-shaped block a35 and a V-shaped block b 40; the lower end of the V-shaped block a35 is fixedly connected with an oil cylinder a33 and an oil cylinder b34, and the oil cylinder a33 and the oil cylinder b34 are fixedly connected in a rectangular groove a51 of the support a 32; the V-shaped block b40 is fixedly connected with the oil cylinder c39, the oil cylinder c39 is fixedly connected in a rectangular groove b52 of the support b38, the support b38 is fixedly connected with the slide block a37 and the slide block b46, the slide block a37 is matched with the slide rail a36, the slide block b46 is matched with the slide rail b45, the right side of the support b38 is fixedly connected with the double-rod air cylinder 41, the double-rod air cylinder rod 42 is connected with the mounting plate c43, the mounting plate c43 is fixedly connected on the mounting plate d44, the mounting plate d44 is fixedly connected with the mounting plate e47, the clamping oil cylinder 48 is arranged on the mounting plate f49, the mounting plate f49 is fixedly connected with the oil cylinder d50, the oil cylinder d50 is fixedly connected with the mounting plate e47, the mounting plate e47 is fixedly connected with the mounting plate g53, and the mounting plate g53 is fixedly connected with the movable sliding table IJ; the platform rotating mechanism L consists of a connecting plate c60, a fixed block 61, a bolt c62, a buffering limiting pin 63, a mounting block 64, a pinion 65, a large gear 66 and a motor 68, wherein the motor 68 in the platform rotating mechanism L is fixedly connected to the connecting plate b 59; pinion 65 meshes with bull gear 66; the large gear 66 is fixedly connected with the connecting plate c 60; the fixing block 61 is fixedly connected to the bottom of the connecting plate c60, the mounting block 64 is fixedly connected to the connecting plate b59, the bolt c62 and the buffering limiting pin 63 are mounted on the mounting block 64, the bolt c62, the buffering limiting pin 63 and the mounting block 64 are symmetrically mounted on two sides of the large gear 66 in a left-right mode and fixedly connected to the bottom of the connecting plate c 60. The platform rotating mechanism L is fixedly connected below the movable sliding table IJ through a connecting plate c 60.
As shown in fig. 17, 18 and 20-26, the adjustable tailstock mechanism iii is composed of a lifting platform M, a movable sliding table ii N, a clamping manipulator O, a bottom plate bracket P and a tailstock rotating mechanism Q, wherein the lifting platform M is composed of an upper plate 76, a hydraulic cylinder 77, a sliding plate 78, a base 79, a roller 87, a connecting block 88 and a connecting plate d89, the lower end of the upper plate 76 is hinged with the hydraulic cylinder 77, the lower end of the hydraulic cylinder 77 is fixedly connected with the sliding plate 78, the sliding plate 78 is in fit connection with the base 79, the lower end of the base 79 is fixedly connected with the connecting plate d89, the lower part of the connecting plate d89 is hinged with the connecting block 88, the connecting block 88 is hinged with the roller 87, and the roller 87 is in fit with the annular track 80; the movable sliding table N consists of a pipeline c74, a support c82, a workbench 83, a mounting plate h84, a stepping motor b85 and a ball screw b86, wherein an outlet of the muffler 19 is fixedly connected with the pipeline c74 through a leather hose b22, the lower half part of the pipeline c74 is fixedly connected with the support c82, the lower end of the support c82 is fixedly connected with the workbench 83, the workbench 83 is fixedly connected with the lower movable sliding table IIN through the mounting plate h84, and the stepping motor b85 is connected with the ball screw b86; the clamping manipulator O consists of a full sound absorption tail end 75, a sensor bracket 91, a manipulator head 92, a connecting rod a93 and a connecting rod b94, wherein the clamping manipulator O is vertically fixedly connected with the connecting rod b94 through the connecting rod a93, the manipulator head 92 is fixedly connected with the tail end of the connecting rod a93, the sensor bracket 91 is arranged on the right side of a pipeline c74, an included angle alpha between the sensor bracket 91 and an axis at the outlet of the right end of the pipeline c74 is 45 degrees, and a spacing L is 500mm; the bottom plate bracket P consists of a trundle 95, a bottom plate 96, an embedded groove 97 and a rectangular groove 98, wherein the bottom plate 96 is fixedly connected to the bottom plate bracket P, the bottom plate 96 is provided with the embedded groove 97 and the rectangular groove 98, the lower part of the bottom plate bracket P is fixedly connected with the trundle 95, and the upper part of the bottom plate bracket P is fixedly connected with the bottom plate 96; the tailstock rotating mechanism Q consists of an annular track 80, a track bracket 81, a roller 87, a connecting block 88 and a connecting plate d89, wherein the lower part of the connecting plate d89 is hinged with the connecting block 88, the connecting block 88 is hinged with the roller 87, the roller 87 is connected with the annular track 80 in a matched manner, and the annular track 80 is fixedly connected with the upper part of the track bracket 81.
As shown in fig. 27, when the transmission loss is measured by the pulse method, the pipe b12 is connected with the air inlet of the muffler 19, the air outlet of the muffler 19 is connected with the pipe c74, and when the transmission loss is measured by the pulse method, the outlet end needs to be ensured to be long enough, and the pipes are lengthened behind the pipe c74 and connected through leather pipes. Then the sensor is connected to measure the transmission loss;
as shown in fig. 28, the transmission loss is measured by adopting an acoustic wave decomposition method, and only the pipeline b12 is connected with the air inlet of the muffler 19, the air outlet of the muffler 19 is connected with the pipeline c74, and then the sound absorption material and the full sound absorption tail end 75 are connected with the outlet end of the pipeline c74 through the clamping manipulator O;
as shown in fig. 29 and 30, the transmission loss is measured by using a two-sound source method, which uses different sound source positional relationships to establish two sets of different equations to solve the quadrupole parameters in the transmission matrix, thereby obtaining the transmission loss. The transmission loss of the silencing structure can be obtained by utilizing the two-sound source method, and the quadrupole parameters of the silencing unit can be calculated. However, the two-sound source method has the defects of complex calculation process, large calculation amount and inconvenient test of sound source position exchange. In order to solve the problem of inconvenient sound source interchange, the silencer mounting workbench is designed into a rotatable structure, the first sound source position is tested, after experimental data are obtained, the movable sliding table IIN and the movable positioning and clamping mechanism K are integrally rotated by 180 degrees through the platform rotating mechanism L, the sound source position is changed, measurement is continued, the second group of experimental data can be obtained, the movement of the sound source is not needed, and the workload is greatly reduced;
as shown in fig. 31 and 32, the pipe b12 is connected to a muffler, the outlet of the muffler connecting pipe c74 is connected to the load 1 by the clamping manipulator O, after test data are obtained, the load 1 is removed by the clamping manipulator O and replaced with the load 2, and a second set of test data are obtained.
Claims (4)
1. An adjustable test bench for automobile muffler performance test, its characterized in that: the sound absorption device consists of a sound-free chamber (A), a pressure control valve (B), a pressure temperature display touch panel (C), a computer (D), a signal receiver (E), a gas-dividing flow and noise generating device (I), a muffler mounting platform (II) and an adjustable tailstock mechanism (III), wherein the inner wall of the sound-free chamber (A) is fixedly connected with a sound absorption plate (90); the pressure control valve (B) is fixedly connected to the top of the right side of the non-sound-return chamber (A); the pressure temperature display touch panel (C) is fixedly connected to the upper part of the right side of the front surface of the sound-free chamber (A); the computer (D), the signal receiver (E), the airflow generating device (F) of the airflow dividing and noise generating device (I) are arranged outside the anechoic room (A); the front end of the signal receiver (E) is connected with a sensor a (17), a sensor b (18), a sensor c (20) and a sensor d (21) of the muffler mounting platform (II); the rear end of the signal receiver (E) is connected with a computer (D); the noise generating device (G) and the air flow stabilizing and temperature controlling device (H) of the air flow dividing and noise generating device (I) are arranged in the anechoic chamber (A); the pipeline a (6) of the air-separating and noise generating device (I) passes through the left side wall of the non-sound-return chamber (A) and is communicated with the left side wall of the air-flow stabilizing and temperature controlling device (H), and the bottom of the bracket b (15) of the air-flow stabilizing and temperature controlling device (H) is fixedly connected with the lower bottom plate (96) of the adjustable tailstock mechanism (III); the noise generating device (G) is fixedly connected to the left side of the airflow stabilizing and temperature controlling device (H) and is communicated with the airflow stabilizing and temperature controlling device (H) through a rectangular hole (8); the pipeline b (12) of the airflow and noise generating device (I) is communicated with the right side wall of the airflow stabilizing and temperature controlling device (H), the middle lower part of the pipeline b (12) of the airflow and noise generating device (I) is fixedly connected with the supporting rod (13), the bottom of the supporting rod (13) is fixedly connected with the lower bottom plate (96) of the adjustable tailstock mechanism (III), and the right end of the pipeline b (12) of the airflow and noise generating device (I) is fixedly connected with the air inlet of the muffler (19) arranged on the movable positioning and clamping mechanism (K) through the percutaneous pipe b (22); the upper end of a lifting mechanism (I) of the muffler mounting platform (II) is fixedly connected with a single-rod cylinder rod (67) on a connecting plate b (59) of the muffler mounting platform (II), and the lower end of the lifting mechanism (I) of the muffler mounting platform (II) is fixedly connected with a lower bottom plate (96) through a connecting plate a (57); the left percutaneous tube b (22) of the pipeline c (74) in the adjustable tailstock mechanism (III) is fixedly connected with the air outlet of the muffler (19), and the lower part of the pipeline c (74) in the adjustable tailstock mechanism (III) is fixedly connected with the movable sliding table II (N) through the workbench (83); the lower part of the movable slipway II (N) is fixedly connected with the lifting platform (M); the clamping manipulator (O) is arranged on the right side of the movable sliding table II (N), and is movable above a lower bottom plate (96) of the adjustable tailstock mechanism (III); the bottom plate bracket (P) is fixedly connected below a bottom plate (96) of the adjustable tailstock mechanism (III); the tailstock rotating mechanism (Q) is connected with the upper lifting platform (M) through a roller (87), and the lower end of the tailstock rotating mechanism (Q) is fixedly connected with the lower bottom plate (96) of the adjustable tailstock mechanism (III) through a track bracket (81).
2. An adjustable test stand for testing the performance of an automotive muffler according to claim 1, wherein: the device comprises a gas flow generating device (F), a noise generating device (G) and a gas flow stabilizing and temperature controlling device (H), wherein the gas flow generating device (F) comprises a bracket a (1), a mounting plate a (2), a fan (3), a pipeline interface (4), a variable frequency speed regulator (5) and a pipeline a (6), the bottom of the bracket a (1) is connected with the ground, the fan (3) is fixedly connected to the mounting plate a (2) above the bracket a (1), the fan (3) is provided with the variable frequency speed regulator (5), the outlet of the fan (3) is connected with the inlet of the pipeline a (6) through the pipeline interface (4), the outlet of the pipeline a (6) is connected with the front part of the gas flow stabilizing and temperature controlling device (H), and the rear part of the gas flow stabilizing and temperature controlling device (H) is fixedly connected with the right end of the noise generating device (G); the air flow stabilizing and temperature controlling device (H) consists of a cover plate (7), rectangular holes (8), rectangular partition plates (9), a heating device (10), an orifice plate flowmeter (11), a pipeline b (12), a supporting rod (13), a mounting plate b (14) and a bracket b (15), wherein the rectangular holes (8) are formed in the rear part of the air flow stabilizing and temperature controlling device (H), the rectangular partition plates (9) are arranged in the middle part of the air flow stabilizing and temperature controlling device (H), round sieve holes are formed in the rectangular partition plates (9), the heating device (10) is arranged on the rectangular partition plates (9), the cover plate (7) above the air flow stabilizing and temperature controlling device (H) is detachable, the orifice plate flowmeter (11) is fixedly connected to the right end near the pipeline b (12), the supporting rod (13) is fixedly connected to the lower part of the middle part of the pipeline b (12), and the air flow stabilizing and temperature controlling device (H) is fixedly connected to the mounting plate b (14) of the bracket b (15), and the right end of the pipeline b (12) is communicated with the rear left part of the air flow stabilizing and temperature controlling device (H); the noise generating device (G) is fixedly connected to the left side of the airflow stabilizing and temperature controlling device (H), and is communicated with the airflow stabilizing and temperature controlling device (H) through a rectangular hole (8).
3. An adjustable test stand for testing the performance of an automotive muffler according to claim 1, wherein: the silencer mounting platform (II) consists of a lifting mechanism (I), a movable sliding table I (J), a movable positioning clamping mechanism (K) and a platform rotating mechanism (L), wherein the lifting mechanism (I) consists of a guide rod (56), a connecting plate a (57), a guide sleeve (58), a connecting plate b (59), a single rod air cylinder rod (67), a motor (68), a single rod air cylinder (69), a hole group a (70), a hole group b (71), an insert (72) and a central hole (73), the single rod air cylinder (69) is fixedly connected below the connecting plate a (57), the single rod air cylinder rod (67) penetrates through the connecting plate a (57), the upper part of the guide rod (56) is fixedly connected with the connecting plate b (59), the upper end of the guide sleeve (58) is fixedly connected with the connecting plate b (59), the lower end of the guide sleeve is fixedly connected with the connecting plate a (57), and the insert (72) and the hole group a (70) of the guide rod (56), the hole group b (71) of the single rod air cylinder rod (67) and the central hole (73) are formed on the connecting plate a (57). The movable sliding table I (J) consists of a mounting plate g (53), a ball screw a (54) and a stepping motor a (55); the mounting plate g (53) is fixedly connected with the upper mounting plate e (47), and the stepping motor a (55) is connected with the ball screw a (54); the movable sliding table I (J) is fixedly connected below the movable positioning and clamping mechanism (K) through a mounting plate g (53); the movable positioning and clamping mechanism (K) consists of a leather hose a (16), a sensor a (17), a sensor b (18), a muffler (19), a sensor c (20), a sensor d (21), a leather hose b (22), a test hose a (23), a pipe joint a (24), a U-shaped pipe (25), a pipe joint b (26), a clamping clip (27), a test hose b (28), a bracket c (29), a bolt a (30), a bolt b (31), a support a (32), an oil cylinder a (33), an oil cylinder b (34), a V-shaped block a (35), a slide rail a (36), a slide block a (37), a support b (38), an oil cylinder c (39), a V-shaped block b (40), a double-rod cylinder (41), a double-rod cylinder rod (42), a mounting plate c (43), a mounting plate d (44), a slide rail b (45), a slide block b (46), a mounting plate e (47), a clamping oil cylinder (48), a mounting plate f (49), an oil cylinder d (50), a rectangular groove a (51) and a rectangular groove b (52), wherein a pipeline b (12) is connected with the muffler (19) through the leather hose a (16; the air outlet of the muffler (19) is connected with a pipeline c (74) through a percutaneous tube b (22); a sensor a (17), a sensor b (18) and a test tube a (23) are arranged at an air inlet of the muffler (19), and a sensor c (20), a sensor d (21) and a test tube b (28) are arranged at an outlet of the muffler (19); the other ends of the test tube a (23) and the test tube b (28) are respectively connected with a U-shaped tube (25) through a tube joint a (24) and a tube joint b (26), the U-shaped tube (25) is fixedly connected to a clamp (27), the clamp (27) is fixedly connected with a bracket c (29), the bracket c (29) is fixedly connected to a mounting plate e (47) through a bolt a (30) and a bolt b (31), and a muffler (19) is positioned by a V-shaped block a (35) and a V-shaped block b (40); the lower end of the V-shaped block a (35) is fixedly connected with an oil cylinder a (33) and an oil cylinder b (34), and the oil cylinder a (33) and the oil cylinder b (34) are fixedly connected in a rectangular groove a (51) of the support a (32); the V-shaped block b (40) is fixedly connected with the oil cylinder c (39), the oil cylinder c (39) is fixedly connected in a rectangular groove b (52) of the support b (38), the support b (38) is fixedly connected with the sliding block a (37) and the sliding block b (46), the sliding block a (37) is matched with the sliding rail a (36), the sliding block b (46) is matched with the sliding rail b (45), the right side of the support b (38) is fixedly connected with the double-rod air cylinder (41), the double-rod air cylinder rod (42) is connected with the mounting plate c (43), the mounting plate c (43) is fixedly connected on the mounting plate d (44), the mounting plate d (44) is fixedly connected with the mounting plate e (47), the clamping oil cylinder (48) is mounted on the mounting plate f (49), the mounting plate f (49) is fixedly connected with the oil cylinder d (50), the oil cylinder d (50) is fixedly connected with the mounting plate e (47), the mounting plate e (47) is fixedly connected with the mounting plate g (53), and the mounting plate g (53) is fixedly connected with the moving sliding table I (J); the platform rotating mechanism (L) consists of a connecting plate c (60), a fixed block (61), a bolt c (62), a buffering limiting pin (63), a mounting block (64), a pinion (65), a large gear (66) and a motor (68), wherein the motor (68) in the platform rotating mechanism (L) is fixedly connected to the connecting plate b (59); the pinion (65) is meshed with the large gear (66); the large gear (66) is fixedly connected with the connecting plate c (60); the method comprises the steps of fixedly connecting a fixed block (61) to the bottom of a connecting plate c (60), fixedly connecting an installation block (64) to a connecting plate b (59), installing a bolt c (62) and a buffering limiting pin (63) on the installation block (64), installing the bolt c (62), the buffering limiting pin (63) and the installation block (64) on two sides of a large gear (66) symmetrically left and right, and fixedly connecting the two sides of the large gear to the bottom of the connecting plate c (60); the platform rotating mechanism (L) is fixedly connected below the movable sliding table I (J) through a connecting plate c (60).
4. An adjustable test stand for testing the performance of an automotive muffler according to claim 1, wherein: the adjustable tailstock mechanism (III) consists of a lifting platform (M), a movable sliding table II (N), a clamping manipulator (O), a bottom plate bracket (P) and a tailstock rotating mechanism (Q), wherein the lifting platform (M) consists of an upper plate (76), a hydraulic cylinder (77), a sliding plate 78, a base (79), a roller (87), a connecting block (88) and a connecting plate d (89), the lower end of the upper plate (76) is hinged with the hydraulic cylinder (77), the lower end of the hydraulic cylinder (77) is fixedly connected with the sliding plate (78), the sliding plate (78) is connected with the base (79) in a matched manner, the lower end of the base (79) is fixedly connected with a connecting plate d (89), the lower part of the connecting plate d (89) is hinged with the connecting block (88), the connecting block (88) is hinged with the roller (87), and the roller (87) is matched with the annular track (80); the movable sliding table II (N) consists of a pipeline c (74), a support c (82), a workbench (83), a mounting plate h (84), a stepping motor b (85) and a ball screw b (86), wherein an outlet of the muffler (19) is fixedly connected with the pipeline c (74) through a leather hose b (22), the lower half part of the pipeline c (74) is fixedly connected with the support c (82), the lower end of the support c (82) is fixedly connected with the workbench (83), the workbench (83) is fixedly connected with the lower movable sliding table II (N) through the mounting plate h (84), and the stepping motor b (85) is connected with the ball screw b (86); the clamping manipulator (O) consists of a full sound absorption tail end (75), a sensor bracket (91), a manipulator head (92), a connecting rod a (93) and a connecting rod b (94), wherein the clamping manipulator (O) is vertically fixedly connected with the connecting rod b (94) through the connecting rod a (93), the manipulator head (92) is fixedly connected with the tail end of the connecting rod a (93), the sensor bracket (91) is arranged on the right side of a pipeline c (74), the included angle alpha between the sensor bracket (91) and the axis at the outlet of the right end of the pipeline c (74) is 45 degrees, and the distance L is 500mm; the bottom plate bracket (P) consists of a trundle (95), a lower bottom plate (96), an embedding groove (97) and a rectangular groove (98), wherein the lower bottom plate (96) is fixedly connected to the bottom plate bracket (P), the embedding groove (97) and the rectangular groove (98) are formed in the lower bottom plate (96), the lower part of the bottom plate bracket (P) is fixedly connected with the trundle (95), and the upper part of the bottom plate bracket (P) is fixedly connected with the lower bottom plate (96); the tailstock rotating mechanism (Q) consists of an annular track (80) and a track bracket (81), and the annular track (80) is fixedly connected with the upper part of the track bracket (81).
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| CN113049208B (en) * | 2021-04-07 | 2023-09-15 | 上海应用技术大学 | Analog noise absorbing device |
| CN116511917B (en) * | 2023-04-28 | 2023-09-19 | 湖北兰荀环保工程有限公司 | Impedance composite muffler and production line thereof |
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