Automobile silencing bag test equipment

Abstract

The invention relates to the technical field of silencer testing, in particular to automobile silencing bag testing equipment which comprises a testing table, a sounder and a sound receiver, sliding tables capable of movably adjusting positions are arranged on the two sides of the top end of the testing table, sliding frames are transversely and slidably connected to the top ends of the sliding tables, and sliding blocks are slidably connected to the inner sides of the sliding frames. The sound generator and the sound receiver are fixedly connected with the top ends of the sliding blocks respectively, the top end of the sliding table is fixedly connected with the fixing frame, and the sides, close to each other, of the sound generator and the sound receiver are fixedly connected with the sound transmission pipes. When the device is used, the sound transmission pipes on the sounder and the sound receiver can be automatically pulled out from the silencing bag under the driving of the driving mechanism, and then are automatically sealed and butted to the other silencing bag to be detected, so that the rapid conversion of test objects is realized, the waiting for long material changing time is not needed, and the test efficiency of the device is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of muffler testing, and particularly relates to a vehicle muffler package testing device. BACKGROUND

[0002] Plug-in hybrid vehicles use engine plus driving motor dual power source, the engine starts and stops frequently, the load mutation is large, the exhaust temperature can be in 200-800℃ between the sharp fluctuation, and the motor low speed high torque working condition makes the exhaust back pressure pulsation more complex, therefore, the muffler package not only has to have a wide frequency insertion loss of >25dB(A), but also needs to withstand higher thermal shock and mechanical vibration, any small leakage will lead to vehicle noise exceeding the standard and catalyst efficiency decline, therefore, the vehicle muffler package needs to be tested after production to ensure product quality.

[0003] The muffler detection device usually includes a sound generating chamber and a sound measuring chamber, the sound generating chamber is provided with a sound generating device and is communicated with a connecting pipe, the sound measuring chamber is provided with a plurality of emission plates and a sound collecting device, and the sound measuring chamber is communicated with another connecting pipe, the current vehicle muffler testing device generally adopts a single cavity frame manual sample changing testing device, after testing, the operator needs to manually remove the flange bolts, hoist out the high-temperature sample package, clamp the new product again and reseal, the whole process takes a long time, thereby affecting the testing efficiency of the device.

[0004] Therefore, a vehicle muffler testing device is provided to solve the above problems. SUMMARY

[0005] The purpose of the present application is to solve the problems in the background art and provide a vehicle muffler testing device.

[0006] To achieve the above purpose, the technical scheme adopted by the present application is as follows: a vehicle muffler testing device, comprising a testing table, a sound generator and a sound receiver, the testing table is provided with movable sliding tables on both sides of the top end, the sliding tables are transversely and slidably connected with sliding frames on the top end, the sliding frames are slidably connected with sliding blocks on the inner side, the sound generator and the sound receiver are respectively fixedly connected with the top end of the sliding blocks, the top end of the sliding table is fixedly connected with a fixed frame, the sound generator and the sound receiver are both fixedly connected with sound transmission pipes on the side close to each other, and the fixed frame is provided with a circular hole on the side close to each other relative to the position beside the sound transmission pipe, the inner side of the fixed frame is fixedly connected with a fixed plate, the top end of the fixed plate is provided with a U-shaped groove, the top end of the sound generator and the sound receiver is fixedly connected with a circular rod, the side wall of the fixed frame is provided with a positioning mechanism for fixing the position of the muffler relative to the position above the circular hole, the fixed plate is provided with a driving plate, a driving mechanism for driving the circular rod to move back and forth in the U-shaped groove is further provided, and a conversion mechanism for converting the testing mode is further provided.

[0007] In the above technical solution, further, a pair of placement tables for placing the soundproofing package are arranged at positions between the top end of the test table and the sliding table, a pair of return springs are fixedly connected between the inner side of the sliding frame and the side wall of the sliding block, and the sound transmission pipe is fixedly connected with a conical sealing ring on the side close to it.

[0008] In the above technical solution, further, the driving mechanism comprises a pair of electric telescopic cylinders, the electric telescopic cylinders are fixedly connected at the top end of the fixed plate and are arranged through the front side of the fixed frame, the output ends of the electric telescopic cylinders are fixedly connected to the side wall of the driving plate, a pair of right-angle plates with inclined surfaces are installed on the bottom end of the driving plate through bolts, the inclined surfaces of the right-angle plates are arranged on the side close to them, vertical grooves are arranged at the corners of the U-shaped groove relative to the top end of the fixed plate, telescopic devices are installed in the inner side of the vertical grooves through bolts, and the output ends of the telescopic devices are fixedly connected with baffle plates which are slidingly connected to the inner side of the U-shaped groove.

[0009] In the above technical solution, further, a position sensor is fixedly connected above the positions between the top end of the driving plate and the right-angle plate, side sensors are fixedly connected to the positions beside the corners of the U-shaped groove relative to the inner side of the fixed frame, and a middle sensor is fixedly connected between the positions relative to the side sensors, the middle sensor, the side sensors, and the position sensor are electrically connected between the controller and the telescopic device.

[0010] In the above technical solution, further, the positioning mechanism comprises a pair of L-shaped plates, the L-shaped plates are slidingly connected to the side wall of the fixed frame, the L-shaped plates are arranged above the circular holes, a pair of side grooves are arranged at the top end of the fixed plate, the side wall of the L-shaped plate is fixedly connected to the inner side of the corresponding side groove, a horizontal bar is fixedly connected to the top end of the L-shaped plate, an upper rod is fixedly connected to the top end of the horizontal bar, a U-shaped frame is fixedly connected to the side wall of the driving plate, an upper plate and a lower plate are respectively installed on the side wall of the U-shaped frame through bolts, and the side away from each other of the upper plate and the lower plate is arranged obliquely.

[0011] In the above technical solution, further, the bottom end of the side close to the soundproofing package of the L-shaped plate is arranged obliquely, clamping springs are fixedly connected between the side wall of the L-shaped plate and the inner side of the fixed frame, the heights of the two upper rods on the fixed plate are different, the height of one of the upper rods is flush with the top end of the lower plate, the height of the other upper rod is arranged to be flush with the top end of the upper plate, and the inclined surface of the lower plate is arranged on the side close to the upper rod with a lower height.

[0012] In the above technical solution, further, the conversion mechanism comprises a conversion plate, a pair of upper mounting holes are arranged on both sides of the top end of the conversion plate, a U-shaped mounting frame is fixedly connected to the side wall of the conversion plate, and a pair of lower mounting holes are arranged through the inner side of the mounting frame.

[0013] Further, the fixed plate top end is provided with a horizontal groove at the corner of the U-shaped groove, and the horizontal groove is in communication with the U-shaped groove, and the inside of the horizontal groove is fixedly connected with a mounting plate for mounting the telescopic device.

[0014] Compared with the prior art, the present application has the following beneficial effects: 1、The present application can automatically pull out the sound pipe on the sound generator and the sound receiver from the soundproof package under the drive of the driving mechanism after the detection of the soundproof package is completed, and then automatically seal and connect to another soundproof package to be detected, so as to realize the rapid conversion of the test object, without waiting for a long time to change the material, greatly improving the test efficiency of the device.

[0015] 2、The present application can convert the original two groups of test paths into a function of testing two soundproof packages at the same time, and can automatically pull out the sound pipe and release the clamping without changing the driving parts, which is convenient for comparative testing of two test members and greatly improves the flexibility of the device. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a front perspective structure diagram of the test equipment of the present application; Figure 2 It is a front perspective structure diagram of the fixed frame and the test table of the present application; Figure 3 It is a separate bottom perspective structure diagram of the fixed plate and the sound generator of the present application; Figure 4 It is a separate perspective structure diagram of the upper plate, the lower plate, the right-angle plate and the driving plate of the present application; Figure 5 It is a whole appearance structure diagram of the sound receiver, the electric telescopic cylinder and the L-shaped plate of the present application; Figure 6 It is a top perspective structure diagram of the fixed frame when the conversion plate is installed and the fixed frame is opened; Figure 7 It is a separate perspective structure diagram of the fixed plate, the sound generator and the conversion plate of the present application; Figure 6 Figure 8 It is a whole appearance structure diagram of the fixed plate, the sound generator and the conversion plate of the present application; Figure 9 It is a separate perspective structure diagram of the driving plate, the sound generator and the conversion plate of the present application.

[0017] ​In the diagram: 1. Test platform; 2. Sound generator; 3. Microphone; 4. Sliding platform; 5. Sliding frame; 6. Slider; 7. Fixed frame; 8. Sound transmission tube; 9. Conical sealing ring; 10. Fixed plate; 11. U-shaped groove; 12. Round rod; 13. Placement platform; 14. Return spring; 15. Electric telescopic cylinder; 16. Drive plate; 17. Right-angle plate; 18. Vertical groove; 19. Telescopic device; 20. Baffle; 21. Position sensor; 22. Side sensor; 23. L-shaped plate; 24. Side groove; 25. Horizontal bar; 26. Upper rod; 27. U-shaped frame; 28. Upper plate; 29. ​​Lower plate; 30. Clamping spring; 31. Conversion plate; 32. Mounting frame; 33. Horizontal groove; 34. Mounting plate; 35. Middle sensor. Detailed Implementation

[0018] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0020] In practical use, it has been found that current automotive muffler testing equipment generally adopts a single-cavity frame manual sample changing testing equipment. After the test is completed, the operator needs to manually remove the flange bolts, lift out the high-temperature sample package, and then clamp the new product and re-connect and seal it. The whole process takes a long time, which affects the testing efficiency of the equipment. In order to solve the above problems, the following structure was invented.

[0021] like Figures 1-9 The illustrated automotive muffler testing equipment includes a test bench 1, a transmitter 2, and a receiver 3. The test bench 1 has movable, adjustable sliding platforms 4 on both sides of its top. Each sliding platform 4 has a horizontally slidable frame 5 at its top, and a slider 6 is slidably connected to the inner side of each sliding frame 5. The transmitter 2 and receiver 3 are respectively fixedly connected to the top of the slider 6. A fixed frame 7 is fixedly connected to the top of the sliding platform 4. A sound transmission tube 8 is fixedly connected to the side of the transmitter 2 and receiver 3 that is close to each other, and the fixed frames 7 are positioned opposite each other on the side that is close to each other. A round hole is provided next to the sound transmission tube 8. A fixing plate 10 is fixedly connected to the inside of the fixing frame 7. A U-shaped groove 11 is provided through the top of the fixing plate 10. A round rod 12 is fixedly connected to the top of the sound generator 2 and the receiver 3. A positioning mechanism for fixing the position of the silencer is provided on the side wall of the fixing frame 7 relative to the position above the round hole. A drive plate 16 is provided on the fixing plate 10. A drive mechanism for driving the round rod 12 to move back and forth in the U-shaped groove 11 is also provided. A conversion mechanism for changing the test mode is also provided. A pair of placement tables 13 for placing soundproofing bags are arranged at the top end of the test table 1 relative to the position between the sliding table 4, a pair of return springs 14 are fixedly connected between the inner side of the sliding frame 5 and the side wall of the sliding block 6, the return springs 14 are arranged to facilitate the resetting of the sliding block 6 and the sound generator 2 or the sound receiver 3, the sound transmission pipe 8 is fixedly connected with a conical sealing ring 9 on the side close to the soundproofing bag, the conical sealing ring 9 is arranged to ensure the sealing performance of the sound transmission pipe 8 after being connected with the soundproofing bag, so as to avoid the loss of sound volume and affect the test structure of the equipment; The driving mechanism includes a pair of electric telescopic cylinders 15, the electric telescopic cylinders 15 are fixedly connected at the top end of the fixed plate 10 and arranged through the front side of the fixed frame 7, the output ends of the electric telescopic cylinders 15 are fixedly connected to the side wall of the driving plate 16, a pair of beveled right-angle plates 17 are installed on the bottom end of the driving plate 16 through bolts, and the bevels of the right-angle plates 17 are arranged on the side close to each other, vertical grooves 18 are arranged at the corners of the U-shaped groove 11 at the top end of the fixed plate 10, and telescopic devices 19 are installed in the vertical grooves 18 through bolts, the output ends of the telescopic devices 19 are fixedly connected with baffle plates 20, and the baffle plates 20 are slidingly connected in the inner side of the U-shaped groove 11; A position sensor 21 is fixedly connected above the right-angle plates 17 at the top end of the driving plate 16, side sensors 22 are fixedly connected at the corners of the U-shaped groove 11 on the inner side of the fixed frame 7, and a middle sensor 35 is fixedly connected between the side sensors 22 on the inner side of the fixed frame 7, the position sensor 21, the side sensors 22 and the middle sensor 35 are electrically connected between the controller and the telescopic device 19, the position sensor 21 is a Hall element, the side sensors 22 and the middle sensor 35 are embedded Hall switches, the position sensor 21 translates with the driving plate 16, and outputs a pulse to the controller every time it passes the side sensor 22, the controller only energizes the telescopic device 19 when the second pulse is counted, the baffle plate 20 instantaneously seals the U-shaped groove 11, limiting the sliding direction of the round rod 12, and then when the position sensor 21 passes the middle sensor 35, the middle sensor 35 transmits a signal to the controller, and the controller controls the telescopic device 19 to retract; The positioning mechanism includes two pairs of L-shaped plates 23, the two pairs of L-shaped plates 23 are slidingly connected through the side walls of the fixed frame 7, and the L-shaped plates 23 are arranged above the round holes, a pair of side grooves 24 are arranged at the top end of the fixed plate 10, the side walls of the L-shaped plates 23 are fixedly connected to the inner side of the corresponding side grooves 24, horizontal bars 25 are fixedly connected to the top end of the L-shaped plates 23, upper rods 26 are fixedly connected to the top end of the horizontal bars 25, a U-shaped frame 27 is fixedly connected to the side wall of the driving plate 16, an upper plate 28 and a lower plate 29 are respectively installed on the side walls of the U-shaped frame 27 through bolts, and the side away from each other of the upper plate 28 and the lower plate 29 is arranged obliquely; The L-shaped plate 23 is inclinedly arranged at the bottom end near the sound-absorbing package, and the clamping spring 30 is fixedly connected between the side wall of the L-shaped plate 23 and the inner side of the fixed frame 7. The two upper rods 26 on the fixed plate 10 are different in height, and the height of one of the upper rods 26 is flush with the top end of the lower plate 29, and the height of the other upper rod 26 is flush with the top end of the upper plate 28, and the inclined surface of the lower plate 29 is arranged on the side close to the upper rod 26 with a lower height; During the test of the sound-absorbing package, the sound-absorbing package is first placed in a slot on the placing table 13, and then the electric telescopic cylinder 15 is controlled to drive the driving plate 16 to move forward (the round rod 12 is in the middle position of the U-shaped slot 11 in the initial process, and the sound transmission pipe 8 is located in the fixed frame 7), and at the same time, the round rod 12 is limited from moving horizontally due to being located in the vertical end of the U-shaped slot 11, and then the round rod 12 is driven to move to the front side by the two right-angle plates 17, so that the sound generator 2 and the sound receiver 3 move forward, and the sliding frame 5 is driven to move vertically on the sliding table 4 by the sliding block 6. In this process, the U-shaped frame 27, the upper plate 28 and the lower plate 29 are moved together by the movement of the driving plate 16, and at this time, the lower plate 29 is moved to the side of one of the upper rods 26; Since the L-shaped plate 23 and the horizontal bar 25 can only move horizontally in the side slot 24, when the inclined surface of the lower plate 29 gradually presses the upper rod 26, the upper rod 26 is pressed to move horizontally (it should be noted that since the height of the upper rod 26 is the same as that of the lower plate 29, the upper rod 26 is not limited by the upper plate 28), and the horizontal bar 25 and the L-shaped plate 23 are driven to move in the inner side of the side slot 24 and gradually compress the clamping spring 30, so that the side end of the L-shaped plate 23 moves to the connecting pipe of the sound-absorbing package. In this process, if the sound-absorbing package is not tightly clamped in the slot on the placing table 13, the inclined surface of the side end of the L-shaped plate 23 will press the outer wall of the connecting pipe of the sound-absorbing package, so as to tightly press the sound-absorbing package and the connecting pipe on the placing table 13, thereby positioning the sound-absorbing package. When the sliding frame 5 moves to the front end of the sliding position and is limited, the round rod 12 also moves to the corner of the U-shaped slot 11 and cannot continue to move to the front side, and before this, the telescopic device 19 drives the baffle 20 to retract into the vertical slot 18, thereby unblocking the U-shaped slot 11; Subsequently, the drive plate 16 is pulled forward by the continued operation of the electric telescopic cylinder 15, at this time, the rear right angle plate 17 is pressed by the slope, which pushes the round rod 12 to move horizontally in the U-shaped groove 11 (since the round rod 12 can only move horizontally at this time, and then the right angle plate 17 is pressed by the slope, which pushes the round rod 12 to move horizontally), at the same time, the upper rod 26 is moved from the slope of the lower plate 29 to the side of the lower plate 29, which keeps the upper rod 26 pressed, at the same time, the slider 6 on the sound generator 2 and the radio 3 moves horizontally on the sliding frame 5, and the return spring 14 is stretched, thereby driving the sound transmission pipe 8 to pass through the round hole, driving the conical sealing ring 9 to insert into the inside of the sound absorbing package, realizing the sealed butt joint of the two, then controlling the sound generator 2 to emit standard noise, then the noise drills into the sound absorbing package along the sound transmission pipe 8, finally the radio 3 measures how much sound energy is left at the outlet pipe, and the difference between the two sound pressure levels is the insertion loss (IL), if the IL is not up to standard, it is judged as unqualified, thereby realizing the test of the sound absorbing package; During the test, another sound absorbing package to be tested can be placed in another slot of the placement table 13, then after the test is completed, the electric telescopic cylinder 15 is controlled to start and drive the drive plate 16 to move backward, thereby driving the right angle plate 17 to move backward, gradually releasing the pressure on the round rod 12, then the slider 6, the sound generator 2 and the radio 3 are pulled back to the original position under the elastic force of the return spring 14, then when the round rod 12 moves to the corner of the U-shaped groove 11, the sound transmission pipe 8 is completely pulled out of the sound absorbing package and moves to the fixed frame 7, at the same time, the position sensor 21 moves to one of the side sensors 22, and the signal is transmitted to the controller, the controller controls the telescopic device 19 to start and drive the baffle 20 to extend, covering the horizontal end of the U-shaped groove 11, limiting the movement direction of the round rod 12, thereby under the action of the continued backward movement of the right angle plate 17, the round rod 12 is pressed to move vertically in the U-shaped groove 11, in this process, the upper plate 28 and the lower plate 29 move together, thereby releasing the pressure on the front upper rod 26, then the upper rod 26 is pushed back under the elastic force of the clamping spring 30; Then, the upper plate 28 and the lower plate 29 move to the side of another upper rod 26, which is pressed by the slope of the upper plate 28 to move repeatedly as described above, clamping the sound absorbing package (it should be noted that since the height of the upper rod 26 is the same as that of the upper plate 28, it will not be affected by the lower plate 29), then the round rod 12 moves to the corner of the other end of the U-shaped groove 11, then it is pressed by the slope of the other right angle plate 17 to repeat the above operation, automatically inserting the conical sealing ring 9 into the connecting pipe of the sound absorbing package to be tested, finally the sound generator 2 and the radio 3 are controlled to start and continue the test, during the test, the tested sound absorbing package is taken out and replaced with another sound absorbing package to be tested, and the device is repeatedly converted and tested.

[0022] In conclusion, through the design of the above structure, the sound-absorbing bag to be detected can be placed on the placing table 13 during the sound-absorbing bag detection process. After the sound-absorbing bag detection is completed, the sound transmitter 2 and the sound receiver 3 can be automatically pulled out from the sound-absorbing bag under the driving of the driving mechanism, and then automatically sealed and docked to another sound-absorbing bag to be detected, so as to realize the rapid conversion of the test object without waiting for a long time for material replacement, thereby greatly improving the test efficiency of the device.

[0023] On the basis of the above embodiment, it is found that the above structure only has one test method. When the test personnel want to use the contrast test method, an additional test instrument needs to be added, which not only increases the test cost but also is troublesome. In order to solve the above problem, the above structure is further improved.

[0024] The conversion mechanism comprises a conversion plate 31, a pair of upper mounting holes are formed on both sides of the top end of the conversion plate 31, and a U-shaped mounting frame 32 is fixedly connected to the side wall of the conversion plate 31. A pair of lower mounting holes are formed in the inner side of the mounting frame 32; Horizontal grooves 33 are formed at the corners of the top end of the fixed plate 10 relative to the U-shaped groove 11, and the horizontal grooves 33 are in communication with the U-shaped groove 11. The mounting plate 34 for installing the telescopic device 19 is fixedly connected to the inner side of the horizontal groove 33; When contrast test is needed, first, the newly added sound transmitter 2 and sound receiver 3 are installed on the sliding table 4, and the round rod 12 on the sound transmitter 2 and the sound receiver 3 is inserted into the U-shaped groove 11. Then, the bolt on one of the right angle plates 17 is unscrewed using a tool, and the bolt on the upper plate 28 is unscrewed using a tool. The upper plate 28 and one of the right angle plates 17 can be removed. Then, the conversion plate 31 is removed, and the right angle plate 17 is installed in the specified direction by being bolted in the upper mounting hole, and the upper plate 28 is bolted in the lower mounting hole on the mounting frame 32. Then, the telescopic device 19 is removed from the vertical groove 18 using a tool and installed on the mounting plate 34 in the horizontal groove 33. Finally, the conversion plate 31 is bolted to the driving plate 16 to remove the mounting position of the right angle plate 17, and the rapid conversion and installation of the equipment are completed. Then, the telescopic device 19 is controlled to extend the baffle 20 out of the horizontal groove 33 to block the U-shaped groove 11 vertically, so that the round rod 12 can only slide in the horizontal direction, and the position sensor 21 and the side sensor 22 do not transmit signals. That is, the device can be controlled to start testing. Before testing, two sound-absorbing packs need to be placed on the placing table 13. Then, when the control electric telescopic cylinder 15 is started, the driving plate 16 will be driven to move, and the upper plate 28, the lower plate 29 and the right-angle plate 17 will be driven to move together. At this time, the upper rod 26 will be first extruded by the inclined surface on the upper plate 28 and the lower plate 29, the L-shaped plate 23 will be clamped to the sound-absorbing pack, then the upper rod 26 moves to the side of the upper plate 28 and the lower plate 29, and then the right-angle plate 17 moves to the side of the round rod 12, extruding the round rod 12 to move in the transverse end of the U-shaped groove 11, and then driving the sound transmission pipes 8 on the sound generator 2 and the sound receiver 3 to move, and sealingly connecting with the sound-absorbing pack for testing.

[0025] In summary, through the design of the above structure, the original two groups of test paths can be converted into the function of testing two groups of sound-absorbing packs at the same time according to the test requirements of the user, and the sound transmission pipes 8 can be automatically pulled out at the same time, and the clamping is released, without changing the driving parts, greatly improving the flexibility of the device, so that two groups of data can be obtained at one time, and A / B comparison can be made on the spot, and the test error, device drift and artificial interference can be completely eliminated, which is equivalent to using time to exchange precision and using parallel to exchange reliability.

[0026] The above shows and describes the basic principles, main features and advantages of the present application.

[0027] Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application.

Claims

1. A test apparatus for automotive muffler packs, comprising a test bench (1), a sound emitter (2) and a sound receiver (3), characterized in that: The test bench (1) top both sides are equipped with movable adjusting position sliding table (4), the sliding table (4) top are transversely slidingly connected with sliding frame (5), the sliding frame (5) inside are slidingly connected with sliding block (6), the sound generator (2) and the radio (3) are fixedly connected with the top of sliding block (6) respectively, the sliding table (4) top is fixedly connected with fixed frame (7), the sound generator (2) and the radio (3) side close to one are fixedly connected with sound transmission tube (8), and the fixed frame (7) side close to one side relative to the position of sound transmission tube (8) is equipped with round hole, the fixed frame (7) inside is fixedly connected with fixed plate (10), the fixed plate (10) top is all equipped with U-shaped groove (11) that penetrates, the sound generator (2) and the radio (3) top are fixedly connected with round rod (12), the fixed frame (7) side wall relative to the position of round hole top is equipped with the positioning mechanism for fixing the position of sound deadening bag, the fixed plate (10) is all equipped with drive plate (16), still be equipped with the drive mechanism for driving the round rod (12) in U-shaped groove (11) back and forth movement, still be equipped with the conversion mechanism for conversion test mode.

2. The test apparatus for a vehicle muffler pack according to claim 1, characterized by: The test bench (1) top relative to the position between sliding table (4) is equipped with a pair of for placing sound deadening bag's placement table (13), the sliding frame (5) inside and the side wall between sliding block (6) are all fixedly connected with a pair of return springs (14), the sound transmission tube (8) side close to one is fixedly connected with conical sealing ring (9).

3. The test apparatus for a vehicle muffler pack according to claim 1, wherein: The drive mechanism includes electric telescopic cylinder (15), the electric telescopic cylinder (15) is provided with a pair, the electric telescopic cylinder (15) is all fixedly connected in the top of fixed plate (10) and is set through the front side of fixed frame (7), the output end of electric telescopic cylinder (15) is all fixedly connected in the side wall of drive plate (16), the drive plate (16) bottom is installed with a pair of right angle plate (17) with inclined plane through bolt, and the inclined plane of right angle plate (17) is set in the side close to, the top of fixed plate (10) is all equipped with vertical slot (18) relative to the corner of U-shaped groove (11), the vertical slot (18) inside is all installed with telescopic ware (19) through bolt, the output end of telescopic ware (19) is fixedly connected with baffle (20), and the baffle (20) is slidingly connected in the inside of U-shaped groove (11) through penetration.

4. The test apparatus for a vehicle muffler pack according to claim 3, wherein: The top of drive plate (16) is fixedly connected with position sensor (21) relative to the between right angle plate (17) top position, the inside of fixed frame (7) is fixedly connected with side inductor (22) relative to the corner of U-shaped groove (11) position, the inside of fixed frame (7) is fixedly connected with middle inductor (35) relative to the between side inductor (22) position, the middle inductor (35), side inductor (22) and position sensor (21) are electrically connected between controller and telescopic ware (19).

5. The test apparatus for a vehicle muffler pack of claim 1, wherein: The positioning mechanism includes two pairs of L-shaped plates (23), which are slidingly connected to the side walls of the fixed frame (7) and arranged above the circular holes, a pair of side grooves (24) is formed at the top end of the fixed plate (10), the side walls of the L-shaped plates (23) are fixedly connected to the inner sides of the corresponding side grooves (24), the top ends of the L-shaped plates (23) are fixedly connected with horizontal bars (25), the top ends of the horizontal bars (25) are fixedly connected with upper rods (26), the side walls of the driving plate (16) are fixedly connected with U-shaped frames (27), the side walls of the U-shaped frames (27) are respectively provided with upper plates (28) and lower plates (29) through bolts, and the sides away from each other of the upper plates (28) and the lower plates (29) are inclinedly arranged.

6. The test apparatus for a vehicle muffler pack according to claim 5, wherein: The bottom ends of the L-shaped plates (23) near the sound-absorbing bags are inclinedly arranged, clamping springs (30) are fixedly connected between the side walls of the L-shaped plates (23) and the inner sides of the fixed frame (7), the heights of the two upper rods (26) on the fixed plate (10) are different, the height of one of the upper rods (26) is flush with the top end of the lower plate (29), and the height of the other upper rod (26) is arranged to be flush with the top end of the upper plate (28), and the inclined surface of the lower plate (29) is arranged on the side near the upper rod (26) with lower height.

7. The test apparatus for a vehicle muffler pack of claim 1, wherein: The conversion mechanism includes a conversion plate (31), a pair of upper mounting holes is formed at the top end of the conversion plate (31), the side walls of the conversion plate (31) are fixedly connected with U-shaped mounting frames (32), and a pair of lower mounting holes is formed in the inner sides of the mounting frames (32).

8. The test apparatus for a vehicle muffler pack according to claim 3, wherein: Horizontal grooves (33) are formed at the corners of the top end of the fixed plate (10) relative to the U-shaped grooves (11), the horizontal grooves (33) are in communication with the U-shaped grooves (11), and mounting plates (34) for mounting the stretchers (19) are fixedly connected to the inner sides of the horizontal grooves (33).

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