Test bench for on-line detection of direct excitation abnormal sound of automobile body

Abstract

The invention relates to the technical field of vehicle abnormal sound detection, and discloses a test bench for on-line detection of direct excitation abnormal sound of an automobile body, the test bench comprises a sinking cavity, a supporting table, an adjusting device and an excitation device are arranged in the sinking cavity, and the excitation device comprises a vibration exciter, a mounting seat, a mounting rack, a vibration plate, a connecting piece and four groups of elastic limiting assemblies. The mounting base and the mounting frame are both arranged at one end of the adjusting device supporting table, the vibration exciter is arranged in the mounting base, the four elastic limiting assemblies are evenly arranged at one end of the mounting frame, the vibration plate is arranged among the four elastic limiting assemblies, the output end of the vibration exciter is connected with the vibration plate, the connecting piece is arranged at one end of the vibration plate, and the supporting table is provided with a detection opening. The detection port is provided with a telescopic assembly; the abnormal sound excitation test is set on the production line, so that the test time is greatly shortened, all production vehicles can be detected, and the detection quality is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle abnormal noise detection, and particularly relates to a test bench for on-line detection of abnormal noise directly excited by an automobile body. Background Art

[0002] Abnormal noises inside the vehicle (such as non-steady noises like Buzz, Squeak, and Rattle) are usually generated by road surface vibrations exciting vehicle components. These uncomfortable noises often reflect potential quality problems of the whole vehicle or components. According to investigations, many abnormal noise problems complained by car owners mainly stem from vibrations or frictions of the vehicle body structure and interior components. Therefore, automobile manufacturers usually carry out special whole vehicle abnormal noise tests to comprehensively identify, diagnose, and eliminate these noise sources, thereby improving product quality and customer experience.

[0003] In the prior art, the whole vehicle abnormal noise test generally drives the vehicle to a specific test bench, connects the docking ends of the power transmission arms on both sides of the test bench with the docking holes under the vehicle body, and drives the power transmission arms through an exciter to perform z-direction excitation simulation on the vehicle body, so as to realize comprehensive abnormal noise detection of the vehicle body. However, since the prior art needs to drive the whole vehicle to a specific test bench for detection, it not only reduces the detection efficiency of the product, but also can only perform sampling inspection, reducing the detection quality of the product. Therefore, we propose a test bench for on-line detection of abnormal noise directly excited by an automobile body to solve the above problems. Summary of the Invention

[0004] The present invention aims to provide a test bench for on-line detection of abnormal noise directly excited by an automobile body, which solves the problems that the prior art needs to drive the whole vehicle to a specific test bench for detection, not only reducing the detection efficiency of the product, but also only being able to perform sampling inspection and reducing the detection quality of the product.

[0005] To achieve the above object, the present invention adopts the following technical scheme: A test bench for on-line detection of abnormal noise directly excited by an automobile body, including a sunken cavity, in which a support platform, an adjusting device, and an exciting device are provided. The support platform is used to support the vehicle, and the support plane of the support platform is flush with the horizontal plane. The adjusting device is used to adjust the position of the exciting device. The exciting device includes an exciter, a mounting seat, a mounting frame, a vibrating plate, a connecting piece, and four groups of elastic limiting components. The mounting seat and the mounting frame are both arranged at one end of the adjusting device close to the support plane of the support platform. The exciter is arranged in the mounting seat. The four groups of elastic limiting components are evenly arranged at one end of the mounting frame close to the support plane of the support platform. The vibrating plate is arranged between the four groups of elastic limiting components. The output end of the exciter is connected to the vibrating plate. The connecting piece is arranged at one end of the vibrating plate away from the exciter, and the connecting piece can be connected to the docking hole of the test vehicle body. The support platform is provided with a detection port, and the detection port is provided with a telescopic component, and the telescopic component is used to cover the detection port.

[0006] The beneficial effects of this solution are as follows: By providing a sunken cavity and arranging the support platform in the sunken cavity, the support plane of the support platform is flush with the horizontal plane, so that the test bench can be set on the vehicle production line, and then the adjustment device and the excitation device are arranged in the sunken cavity, reducing the floor space occupied by the automotive production line. The adjustment device is used to extend the excitation device out of the detection port and connect the connecting piece of the excitation device with the docking hole of the vehicle body. The telescopic assembly is used to cover the detection port, so as to facilitate the vehicle to drive on the support platform. The vibrator is used to provide a vibration source for the vehicle body, so that the vehicle simulates road driving and road excitation. When the vehicle is assembled, the vehicle can drive above the detection port. By starting the telescopic assembly, the detection port is exposed. Subsequently, the adjustment device drives the connecting piece of the excitation device to extend out of the detection port and connect with the docking hole of the vehicle body. Then, the excitation device conducts an abnormal noise excitation test on the vehicle body. When the abnormal noise excitation test is completed, the vehicle drives out of the production line. By setting the abnormal noise excitation test on the production line, the test time is greatly shortened, and at the same time, all production vehicles can be detected, greatly improving the detection quality.

[0007] Preferably, as an improvement, the telescopic assembly includes a support plate, a sliding screw pair, a first motor, a cover plate, and two groups of guide rails. Several support beams are provided at one end of the support platform close to the excitation device. The support plate is arranged at one end of the several support beams close to the support platform. The sliding screw pair is arranged at the end of the support plate away from the support beam. The first motor is arranged at the end of the support plate away from the support beam, and the output end of the first motor is connected to the screw of the sliding screw pair. The two groups of guide rails are symmetrically arranged at one end of the support plate close to the detection port. A matching slider is provided on the outer wall of the guide rail. The cover plates are jointly arranged between the two sliders, and the nut in the sliding screw pair is connected to the cover plate.

[0008] The beneficial effects are as follows: The support beams are used to support the support plate, improving the weighing capacity of the support plate. The first motor is used to provide power for the sliding screw pair, so that the screw in the sliding screw pair can drive the corresponding nut to move on its outer wall. The nut in the sliding screw pair is connected to the cover plate, so that the cover plate can move at the detection port, thereby completing the covering or opening of the detection port. The guide rails are used to install the sliders. Through the mutual cooperation of the guide rails and the sliders, the stability of the cover plate during movement can be increased, and at the same time, a certain supporting force is provided for the cover plate.

[0009] Preferably, as an improvement, the elastic limiting component includes a first limiting member and a second limiting member. The first limiting member includes a first lower positioning block, a first upper positioning block, and two vertical elastic sheets. The first lower positioning block is provided at one end of the mounting frame away from the vibrator. The two vertical elastic sheets are symmetrically arranged on both sides of the first lower positioning block. The first upper positioning block is arranged between the two vertical elastic sheets and is located above the first lower positioning block. The second limiting member includes two second positioning blocks and two planar elastic sheets. One of the second positioning blocks is provided at one end of the first upper positioning block away from the vibrator, and the other second positioning block is provided at one end of the vibrating plate close to the vibrator. The two planar elastic sheets are symmetrically arranged between the two second positioning blocks.

[0010] The beneficial effects are as follows: The elastic limiting member is used to improve the stability of the vibrating plate during vibration excitation. The first limiting member provides deformation of the vibrating plate in the vertical direction through the vertical elastic sheets, and the second limiting member provides deformation of the vibrating plate in the horizontal direction through the planar elastic sheets. Since both ends of the vertical elastic sheets and the planar elastic sheets are fixed, the vertical elastic sheets and the planar elastic sheets will generate resistance when subjected to forces parallel to themselves, thereby providing resistance to the planar movement of the vibrating plate, and thus improving the stability of the vibrating plate vibrating in the z direction.

[0011] Preferably, as an improvement, the adjusting device includes a mounting base, an x-direction adjusting member, a y-direction adjusting member, and a z-direction adjusting member. The mounting base is provided on the inner wall of the sinking cavity. The y-direction adjusting member is provided at one end of the mounting base close to the support platform. The y-direction adjusting member includes a y-direction moving plate, a y-direction screw pair, a y-direction driving member, and two groups of y-direction guide rails. The y-direction screw pair and the y-direction driving member are both provided at one end of the mounting base close to the support platform, and the output end of the y-direction driving member is connected to the screw of the y-direction screw pair. The two groups of y-direction guide rails are symmetrically arranged at one end of the mounting base close to the support platform. The y-direction moving plate is arranged on the outer walls of the two y-direction guide rails, and the nut of the y-direction screw pair is connected to the y-direction moving plate. The x-direction adjusting member includes an x-direction moving plate, an x-direction screw pair, an x-direction driving member, and two groups of x-direction guide rails. The x-direction screw pair and the x-direction driving member are both provided at one end of the y-direction moving plate away from the mounting base, and the output end of the x-direction driving member is connected to the screw of the x-direction screw pair. The two groups of x-direction guide rails are symmetrically arranged at one end of the y-direction moving plate away from the mounting base. The x-direction moving plate is arranged on the outer walls of the two x-direction guide rails, and the nut of the x-direction screw pair is connected to the x-direction moving plate. The z-direction adjusting member includes a support frame, a z-direction moving plate, a z-direction screw pair, a z-direction transmission member, and two groups of z-direction guide rails. The support frame is provided at one end of the x-direction moving plate away from the mounting base. The z-direction screw pair is provided at one end of the support frame. The z-direction transmission member is provided at one end of the x-direction moving plate away from the mounting base, and the output end of the z-direction transmission member is connected to the z-direction screw pair. The two groups of z-direction guide rails are symmetrically arranged at one end of the support frame close to the z-direction screw pair. The z-direction moving plate is arranged on the outer walls of the two z-direction guide rails, and the nut of the z-direction screw pair is connected to the z-direction moving plate. The excitation device is provided at one end of the z-direction moving plate away from the mounting base.

[0012] The beneficial effects are as follows: The mounting base is used to improve the stability of the adjusting device. The x-direction adjusting member is used to drive the vibration excitation device to move in the x direction. The y-direction adjusting member is used to drive the vibration excitation device to move in the y direction. The z-direction adjusting member is used to drive the vibration excitation device to move in the z direction. Since the position of each test vehicle parked on the support platform varies, the position of the docking hole on the vehicle body changes. To improve the efficiency of the automotive abnormal noise excitation test, the x-direction adjusting member, y-direction adjusting member, and z-direction adjusting member drive the vibration excitation device to move in the space of the sinking cavity, so that the connecting member of the excitation device can be quickly docked with the docking hole on the vehicle body.

[0013] Preferably, as an improvement, the connecting member includes a hydraulic cylinder, a thimble, and a expanding sleeve. The hydraulic cylinder is arranged at one end of the vibrating plate away from the mounting frame. The expanding sleeve is arranged at one end of the hydraulic cylinder away from the vibrating plate, and the expanding sleeve can be connected to the docking hole of the test vehicle body. The thimble is arranged inside the hydraulic cylinder, and the thimble can extend into the expanding sleeve.

[0014] The beneficial effects are as follows: The adjusting device docks the expanding sleeve with the docking hole, and then the hydraulic cylinder pushes the thimble to move into the expanding sleeve, so that the expanding sleeve expands and is fixed to the docking hole, and then the excitation device is connected to the vehicle to be tested, completing the abnormal noise excitation test on the vehicle body.

[0015] Preferably, as an improvement, the excitation device further includes two groups of air bags symmetrically arranged between the mounting frame and the vibrating plate, and the air bags are all connected to an air source.

[0016] The beneficial effects are as follows: The air source is used to control the air pressure in the air bag. Since during the abnormal noise excitation test of the vehicle, the operator needs to enter the vehicle to check whether there is any loose abnormal noise inside the steering column, pipe column or instrument panel by shaking the steering wheel, or step on the brake or accelerator pedal to detect whether there is any abnormal vibration or noise in the pedal mechanism or surrounding components. However, when the operator enters the vehicle, the vehicle body weight increases and the chassis sags, causing the vibrating plate of the excitation device to deviate from the initial equilibrium position. In this solution, the air pressure in the air bag is adjusted to control the volume of the air bag, so as to lift the vibrating plate until the vibrating plate rises to the initial equilibrium position, ensuring the accuracy of the abnormal noise excitation test.

[0017] Preferably, as an improvement, the x-direction screw pair, y-direction screw pair, and z-direction screw pair are all set as ball screw pairs.

[0018] Preferably, as an improvement, the z-direction transmission member further includes a z-direction driving member, a transmission frame, a driving pulley, a driven pulley and a belt. The transmission frame is arranged at one end of the x-direction moving plate away from the mounting base. The z-direction driving member is arranged at one end of the transmission frame away from the x-direction moving plate, and the output end of the z-direction driving member penetrates into the transmission frame. The driving pulley is arranged at the output end of the z-direction driving member, the driven pulley is arranged at one end of the lead screw in the z-direction lead screw pair, and the belt is sleeved on the outer walls of the driving pulley and the driven pulley.

[0019] Preferably, as an improvement, the x-direction driving member, the y-direction driving member and the z-direction driving member are all set as servo motors. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a three-dimensional structural diagram of the test bench according to the embodiment of the present invention;

[0021] Figure 2 is a three-dimensional structural diagram of the excitation device according to the embodiment of the present invention;

[0022] Figure 3 is a partial cross-sectional structural diagram of the connecting member according to the embodiment of the present invention;

[0023] Figure 4 is a three-dimensional structural diagram of the telescopic assembly according to the embodiment of the present invention;

[0024] Figure 5 is Figure 4 an enlarged structural diagram of part A in

[0025] Figure 6 is a three-dimensional structural diagram of the adjusting device according to the embodiment of the present invention;

[0026] Figure 7 is a three-dimensional structural diagram of the z-direction transmission member according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following is further detailed through specific embodiments:

[0028] The reference numerals in the accompanying drawings of the specification include: support platform 1, vibrator 2, mounting base 3, mounting frame 4, vibrating plate 5, inspection port 6, support plate 7, sliding screw pair 8, first motor 9, cover plate 10, guide rail 11, support beam 12, first lower positioning block 13, first upper positioning block 14, vertical elastic piece 15, second positioning block 16, planar elastic piece 17, mounting base 18, y-direction moving plate 19, y-direction screw pair 20, y-direction driving member 21, y-direction guide rail 22, x-direction moving plate 23, x-direction screw pair 24, x-direction driving member 25, x-direction guide rail 26, support frame 27, z-direction moving plate 28, z-direction screw pair 29, z-direction guide rail 30, z-direction driving member 31, transmission frame 32, driving pulley 33, driven pulley 34, belt 35, hydraulic cylinder 36, ejector pin 37, expansion sleeve 38, airbag 39, adjustment device 40, excitation device 41.

[0029] Embodiment

[0030] The embodiment is basically as shown in the attached Figure 1-7 drawing. As Figure 1 shown, a test bench for on-line detection of abnormal noise directly excited by an automobile body includes a sunken cavity, which is opened below the automobile production line. A support platform 1, an adjustment device 40 and an excitation device 41 are arranged in the sunken cavity. Of course, two groups of adjustment devices 40 and excitation devices 41 can be symmetrically arranged along the axis of the vehicle body in the sunken cavity to realize the torsional excitation test of the vehicle body. The support platform 1 is fixedly installed on the inner wall of the sunken cavity. The support platform 1 is used to support the vehicle, and the support plane of the support platform 1 is flush with the horizontal plane of the automobile production line. A 3D vision sensor is embedded in the support plane of the support platform 1, or the 3D vision sensor is slidably installed at the lower end of the support platform 1. After the cover plate 10 leaves the inspection port 6, the 3D vision sensor can extend out of the inspection port 6. The 3D vision sensor is used to perform 3D scanning on the docking holes of the vehicle body in a specified area and calculate the relative coordinates of the docking holes. Then, by controlling the adjustment device 40, the connecting piece of the excitation device 41 is connected to the docking hole of the vehicle body. The excitation device 41 includes a vibrator 2, a mounting base 3, a mounting frame 4, a vibrating plate 5, a connecting piece and four groups of elastic limiting components. The mounting base 3 and the mounting frame 4 are both fixedly installed on the upper end of the adjustment device 40. As Figure 2The shown mounting base 3 is located directly below the mounting frame 4. The vibrator 2 is fixedly installed within the mounting base 3. Four groups of elastic limiting components are evenly and fixedly installed at the four corners of the upper end of the mounting frame 4. The vibrating plate 5 is fixedly installed between the four groups of elastic limiting components. The elastic limiting component includes a first limiting member and a second limiting member. The first limiting member includes a first lower positioning block 13, a first upper positioning block 14, and two vertical elastic sheets 15. The first lower positioning block 13 is fixedly installed at one corner of the upper end of the mounting frame 4, and the first lower positioning block 13 forms an equilateral triangle with this corner. The two vertical elastic sheets 15 are symmetrically and fixedly installed on the two side walls of the first lower positioning block 13. The first upper positioning block 14 is fixedly installed between the two vertical elastic sheets 15, and the first upper positioning block 14 is located directly above the first lower positioning block 13. The second limiting member includes two second positioning blocks 16 and two planar elastic sheets 17. One of the second positioning blocks 16 is fixedly installed at the upper end of the first upper positioning block 14, and the other second positioning block 16 is fixedly installed at the lower end of the vibrating plate 5. The two planar elastic sheets 17 are symmetrically and fixedly installed at the upper and lower ends of the two second positioning blocks 16. The output end of the vibrator 2 is fixedly connected to the lower end of the vibrating plate 5. The connecting member is fixedly installed at the upper end of the vibrating plate 5, and the connecting member can be connected to the docking hole of the test vehicle body, such as Figure 2 and Figure 3 The shown connecting member includes a hydraulic cylinder 36, a thimble 37, and a expanding sleeve 38. The hydraulic cylinder 36 is fixedly installed at the upper end of the vibrating plate 5. The expanding sleeve 38 is fixedly installed at the upper end of the hydraulic cylinder 36 through a flange, and the expanding sleeve 38 can be connected to the docking hole of the test vehicle body. The thimble 37 is slidably installed within the hydraulic cylinder 36, and the thimble 37 can extend into the expanding sleeve 38. The excitation device 41 further includes two groups of air bags 39 symmetrically arranged between the mounting frame 4 and the vibrating plate 5. The air bags 39 are all connected to a gas source.

[0031] such as Figure 1 and Figure 4 The shown support platform 1 is provided with a detection port 6. A telescopic component is arranged below the detection port 6. The telescopic component is used to cover the detection port 6, such as Figure 5 The shown telescopic component includes a support plate 7, a sliding screw pair 8, a first motor 9, a cover plate 10, and two groups of guide rails 11. A number of support beams 12 are fixedly installed at the lower end of the support platform 1. In this embodiment, the support beams 12 are set to 4. The support plate 7 is fixedly installed at the upper ends of the 4 support beams 12. The sliding screw pair 8 is fixedly installed at the upper end of the support plate 7. An L-shaped mounting plate is fixedly installed at the rear side of the upper end of the support plate 7. The first motor 9 is fixedly installed at the rear end of the L-shaped mounting plate, and the output end of the first motor 9 is fixedly connected to the screw of the sliding screw pair 8. The two groups of guide rails 11 are symmetrically and fixedly installed on the left and right sides of the upper end of the support plate 7. Sliders matching with the guide rails 11 are slidably installed at the upper ends of the guide rails 11. The cover plate 10 is fixedly installed between the two sliders together, and the nut in the sliding screw pair 8 is fixedly connected to the lower end of the cover plate 10.

[0032] such asFigure 6 and Figure 7 The adjusting device 40 shown in Figure 7 includes a mounting base 18, an x-direction adjusting member, a y-direction adjusting member, and a z-direction adjusting member. The mounting base 18 is fixedly installed on the inner wall of the sinking cavity. The y-direction adjusting member is arranged at the upper end of the mounting base 18. The y-direction adjusting member includes a y-direction moving plate 19, a y-direction screw pair 20, a y-direction driving member 21, and two groups of y-direction guide rails 22. The y-direction screw pair 20 is fixedly installed at the upper end of the mounting base 18. As shown in Figure 6 , an L-shaped mounting plate is fixedly installed on the right side of the upper end of the mounting base 18 shown in Figure 7 . The y-direction driving member 21 is fixedly installed at the right end of the L-shaped mounting plate, and the output end of the y-direction driving member 21 is fixedly connected to the screw in the y-direction screw pair 20. Two groups of y-direction guide rails 22 are symmetrically and fixedly installed on the front and rear sides of the upper end of the mounting base 18. Sliders matching them are slidably installed at the upper ends of the two groups of y-direction guide rails 22. The y-direction moving plate 19 is fixedly installed at the upper ends of the sliders of the two groups of y-direction guide rails 22, and the nut in the y-direction screw pair 20 is fixedly connected to the lower end of the y-direction moving plate 19. The x-direction adjusting member includes an x-direction moving plate 23, an x-direction screw pair 24, an x-direction driving member 25, and two groups of x-direction guide rails 26. The x-direction screw pair is fixedly installed at the upper end of the y-direction moving plate 19. An L-shaped mounting plate is fixedly installed at the rear side of the upper end of the y-direction moving plate 19. The x-direction driving member 25 is fixedly installed at the rear end of the L-shaped mounting plate, and the output end of the x-direction driving member 25 is fixedly connected to the screw in the x-direction screw pair 24. Two groups of x-direction guide rails 26 are symmetrically and fixedly installed on the left and right sides of the upper end of the y-direction moving plate 19. Sliders matching them are slidably installed at the upper ends of the two groups of x-direction guide rails 26. The x-direction moving plate 23 is fixedly installed at the upper ends of the sliders of the two groups of x-direction guide rails 26, and the nut in the x-direction screw pair 24 is fixedly connected to the lower end of the x-direction moving plate 23. The z-direction adjusting member includes a support frame 27, a z-direction moving plate 28, a z-direction screw pair 29, a z-direction transmission member, and two groups of z-direction guide rails 30. The support frame 27 is fixedly installed at the upper end of the x-direction moving plate 23. The z-direction screw pair 29 is fixedly installed at the right end of the support frame 27. The z-direction transmission member is arranged at the left end of the x-direction moving plate 23. As shown in Figure 7 Figure 6 shown, an L-shaped mounting plate is fixedly installed on the right side of the upper end of the mounting base 18 shown in Figure 7 . The y-direction driving member 21 is fixedly installed at the right end of the L-shaped mounting plate, and the output end of the y-direction driving member 21 is fixedly connected to the screw in the y-direction screw pair 20. Two groups of y-direction guide rails 22 are symmetrically and fixedly installed on the front and rear sides of the upper end of the mounting base 18. Sliders matching them are slidably installed at the upper ends of the two groups of y-direction guide rails 22. The y-direction moving plate 19 is fixedly installed at the upper ends of the sliders of the two groups of y-direction guide rails 22, and the nut in the y-direction screw pair 20 is fixedly connected to the lower end of the y-direction moving plate 19. The x-direction adjusting member includes an x-direction moving plate 23, an x-direction screw pair 24, an x-direction driving member 25, and two groups of x-direction guide rails 26. The x-direction screw pair is fixedly installed at the upper end of the y-direction moving plate 19. An L-shaped mounting plate is fixedly installed at the rear side of the upper end of the y-direction moving plate 19. The x-direction driving member 25 is fixedly installed at the rear end of the L-shaped mounting plate, and the output end of the x-direction driving member 25 is fixedly connected to the screw in the x-direction screw pair 24. Two groups of x-direction guide rails 26 are symmetrically and fixedly installed on the left and right sides of the upper end of the y-direction moving plate 19. Sliders matching them are slidably installed at the upper ends of the two groups of x-direction guide rails 26. The x-direction moving plate 23 is fixedly installed at the upper ends of the sliders of the two groups of x-direction guide rails 26, and the nut in the x-direction screw pair 24 is fixedly connected to the lower end of the x-direction moving plate 23. The z-direction adjusting member includes a support frame 27, a z-direction moving plate 28, a z-direction screw pair 29, a z-direction transmission member, and two groups of z-direction guide rails 30. The support frame 27 is fixedly installed at the upper end of the x-direction moving plate 23. The z-direction screw pair 29 is fixedly installed at the right end of the support frame 27. The z-direction transmission member is arranged at the left end of the x-direction moving plate 23. As shown in Figure 7 Figure 7 shown, the z-direction transmission member further includes a z-direction driving member 31, a transmission frame 32, a driving pulley 33, a driven pulley 34, and a belt 35. The transmission frame 32 is arranged in a "mouth" shape and is fixedly installed at the upper end of the x-direction moving plate 23. The z-direction driving member 31 is fixedly installed at the upper end of the transmission frame 32, and the output end of the z-direction driving member 31 penetrates into the transmission frame 32. The driving pulley 33 is fixedly installed at the output end of the z-direction driving member 31. The driven pulley 34 is fixedly installed at the lower end of the screw in the z-direction screw pair 29. The belt 35 is sleeved on the outer walls of the driving pulley 33 and the driven pulley 34. As shown in Figure 6 Figure 6The two groups of z-direction guide rails 30 shown are symmetrically and fixedly installed on the front and rear sides of the right end of the support frame 27. Sliders matching them are slidably installed at the upper ends of the two groups of z-direction guide rails 30. The z-direction moving plate 28 is fixedly installed at the upper ends of the sliders of the two groups of z-direction guide rails 30. And the nut in the z-direction lead screw pair 29 is fixedly connected to the lower end of the z-direction moving plate 28. An L-shaped mounting plate is fixedly installed at the right end of the z-direction moving plate 28. The excitation device 41 is fixedly installed at the upper end of the L-shaped mounting plate. The x-direction lead screw pair 24, the y-direction lead screw pair 20, and the z-direction lead screw pair 29 are all set as ball screw pairs. The x-direction driving member 25, the y-direction driving member 21, and the z-direction driving member 31 are all set as servo motors. The x-direction driving member 25, the y-direction driving member 21, the z-direction driving member 31, and the hydraulic cylinder 36 are all controlled by an electric control system. And the electric control system is electrically connected to the 3D vision sensor.

[0033] The specific implementation process is as follows:

[0034] After the vehicle is assembled, it travels on the production line to the upper end of the support platform 1. When the docking hole of the vehicle moves above the detection port 6, the vehicle stops moving. At this time, the 3D vision sensor performs a 3D scan of the vehicle body docking and calculates the relative coordinates of the docking hole. While the 3D vision sensor scans the docking hole, the first motor 9 drives the screw rod in the sliding screw pair 8 to rotate, thereby driving the cover plate 10 fixedly connected to the nut of the sliding screw pair 8 to move, and then exposing the detection port 6, facilitating the subsequent docking of the excitation device 41 with the vehicle body. After the 3D vision sensor calculates the relative coordinates of the vehicle body docking hole, the coordinate data is transmitted to the electronic control system through an electrical signal. The electronic control system then controls the x-direction driving member 25, y-direction driving member 21, and z-direction driving member 31 to rotate, so as to dock the connecting member of the excitation device 41 with the docking hole of the vehicle body. When the connection between the connecting member and the docking hole is completed, the electronic control system controls the hydraulic cylinder 36 to move the thimble 37 into the expansion sleeve 38, so that the expansion sleeve 38 expands until the expansion sleeve 38 is tightly connected to the docking hole. Subsequently, the operator enters the vehicle to be tested to detect the components inside the vehicle. Since the operator enters the interior of the vehicle, it will cause the weight of the vehicle to increase, resulting in the docking hole pressing down on the connecting member, thereby causing the vibrating plate 5 to move downward, causing the vibrating plate 5 to deviate from the initial balance position of the excitation test. At this time, the air pressure in the airbag 39 is adjusted by controlling the air source, so that the airbag 39 expands until the vibrating plate 5 returns to the initial balance position. At this time, the output end of the vibrator 2 is zeroed to ensure that the vibration amplitude of the vibrating plate 5 remains consistent. After the vibrating plate 5 and the vibrator 2 are adjusted, the vibrator 2 is started to perform a abnormal noise excitation test on the vehicle body. When the vibrator 2 drives the vibrating plate 5 to vibrate in the z direction, the first limiting member provides deformation of the vibrating plate 5 in the vertical direction through the vertical elastic sheet 15, and the second limiting member provides deformation of the vibrating plate 5 in the horizontal direction through the planar elastic sheet 17. Since both ends of the vertical elastic sheet 15 and the planar elastic sheet 17 are fixed, the vertical elastic sheet 15 and the planar elastic sheet 17 will generate resistance when subjected to a force parallel to themselves, thereby providing resistance to the planar movement of the vibrating plate 5, thus improving the stability of the vibrating plate 5 vibrating in the z direction, and further improving the accuracy of the vehicle body abnormal noise excitation test. In this solution, by setting the abnormal noise excitation test on the production line, the test time is greatly shortened, and at the same time, all production vehicles can be detected, greatly improving the detection quality.

[0035] The above are only embodiments of the present invention, and common general technical solutions and / or characteristics in the solutions are not described in detail herein. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicability of the patent. The protection scope claimed in this application shall be subject to the content of its claims, and the specific implementation manners and the like recorded in the specification can be used to interpret the content of the claims.

Claims

1. A test bench for on-line detection of direct excitation abnormal noise of automobile body, characterized in that: It includes a sunken cavity, in which a support platform, an adjustment device and an excitation device are provided. The support platform is used to support the vehicle, and the support plane of the support platform is flush with the horizontal plane. The adjustment device is used to adjust the position of the excitation device. The excitation device includes an exciter, a mounting seat, a mounting frame, a vibrating plate, a connecting piece and four groups of elastic limiting components. The mounting seat and the mounting frame are both arranged at one end of the adjustment device close to the support plane of the support platform. The exciter is arranged in the mounting seat. The four groups of elastic limiting components are evenly arranged at one end of the mounting frame close to the support plane of the support platform. The vibrating plate is arranged between the four groups of elastic limiting components. The output end of the exciter is connected to the vibrating plate. The connecting piece is arranged at the end of the vibrating plate away from the exciter, and the connecting piece can be connected to the docking hole of the test vehicle body. The support platform is provided with a detection port, and the detection port is provided with a telescopic component, and the telescopic component is used to cover the detection port.

2. The test bench for on-line detection of abnormal noise in direct excitation of automobile body according to claim 1, characterized in that: The telescopic component includes a support plate, a sliding screw pair, a first motor, a cover plate and two groups of guide rails. There are several support beams at one end of the support platform close to the excitation device. The support plate is arranged at one end of the several support beams close to the support platform. The sliding screw pair is arranged at the end of the support plate away from the support beam. The first motor is arranged at the end of the support plate away from the support beam, and the output end of the first motor is connected to the screw of the sliding screw pair. The two groups of guide rails are symmetrically arranged at one end of the support plate close to the detection port. The outer wall of the guide rail is provided with a matching slider. The cover plates are jointly arranged between the two sliders, and the nut in the sliding screw pair is connected to the cover plate.

3. The test bench for on-line detection of abnormal noise directly excited on an automobile body according to claim 2, characterized in that: The elastic limiting component includes a first limiting piece and a second limiting piece. The first limiting piece includes a first lower positioning block, a first upper positioning block and two vertical elastic pieces. The first lower positioning block is arranged at one end of the mounting frame away from the exciter. The two vertical elastic pieces are symmetrically arranged on both sides of the first lower positioning block. The first upper positioning block is arranged between the two vertical elastic pieces, and the first upper positioning block is located above the first lower positioning block. The second limiting piece includes two second positioning blocks and two planar elastic pieces. One of the second positioning blocks is arranged at one end of the first upper positioning block away from the exciter, and the other second positioning block is arranged at one end of the vibrating plate close to the exciter. The two planar elastic pieces are symmetrically arranged between the two second positioning blocks.

4. A test bench for on-line detection of abnormal noise in direct excitation of automobile body according to claim 3, characterized in that: The adjusting device includes a mounting base, an x-direction adjusting member, a y-direction adjusting member, and a z-direction adjusting member. The mounting base is arranged on the inner wall of the sinking cavity. The y-direction adjusting member is arranged at one end of the mounting base close to the support platform. The y-direction adjusting member includes a y-direction moving plate, a y-direction screw pair, a y-direction driving member, and two groups of y-direction guide rails. The y-direction screw pair and the y-direction driving member are both arranged at one end of the mounting base close to the support platform, and the output end of the y-direction driving member is connected to the screw of the y-direction screw pair. The two groups of y-direction guide rails are symmetrically arranged at one end of the mounting base close to the support platform. The y-direction moving plate is arranged on the outer walls of the two groups of y-direction guide rails, and the nut of the y-direction screw pair is connected to the y-direction moving plate. The x-direction adjusting member includes an x-direction moving plate, an x-direction screw pair, an x-direction driving member, and two groups of x-direction guide rails. The x-direction screw pair and the x-direction driving member are both arranged at one end of the y-direction moving plate away from the mounting base, and the output end of the x-direction driving member is connected to the screw of the x-direction screw pair. The two groups of x-direction guide rails are symmetrically arranged at one end of the y-direction moving plate away from the mounting base. The x-direction moving plate is arranged on the outer walls of the two groups of x-direction guide rails, and the nut of the x-direction screw pair is connected to the x-direction moving plate. The z-direction adjusting member includes a support frame, a z-direction moving plate, a z-direction screw pair, a z-direction transmission member, and two groups of z-direction guide rails. The support frame is arranged at one end of the x-direction moving plate away from the mounting base. The z-direction screw pair is arranged at one end of the support frame. The z-direction transmission member is arranged at one end of the x-direction moving plate away from the mounting base, and the output end of the z-direction transmission member is connected to the z-direction screw pair. The two groups of z-direction guide rails are symmetrically arranged at one end of the support frame close to the z-direction screw pair. The z-direction moving plate is arranged on the outer walls of the two groups of z-direction guide rails, and the nut of the z-direction screw pair is connected to the z-direction moving plate. The excitation device is arranged at one end of the z-direction moving plate away from the mounting base.

5. The test bench for on-line detection of abnormal noise directly excited on an automobile body according to claim 4, characterized in that: The connecting member includes a hydraulic cylinder, a thimble, and an expansion sleeve. The hydraulic cylinder is arranged at one end of the vibrating plate away from the mounting frame. The expansion sleeve is arranged at one end of the hydraulic cylinder away from the vibrating plate, and the expansion sleeve can be connected to the docking hole of the test vehicle body. The thimble is arranged inside the hydraulic cylinder, and the thimble can extend into the expansion sleeve.

6. The test bench for on-line detection of abnormal noise in direct excitation of automobile body according to claim 5, characterized in that: The excitation device further includes two groups of air bags symmetrically arranged between the mounting frame and the vibrating plate, and the air bags are both connected to a gas source.

7. The test bench for on-line detection of abnormal noise directly excited by an automobile body according to claim 6, characterized in that: The x-direction screw pair, the y-direction screw pair, and the z-direction screw pair are all arranged as ball screw pairs.

8. The test bench for on-line detection of abnormal noise directly excited by the automobile body according to claim 7, characterized in that: The z-direction transmission member further includes a z-direction driving member, a transmission frame, a driving belt pulley, a driven belt pulley, and a belt. The transmission frame is arranged at one end of the x-direction moving plate away from the mounting base. The z-direction driving member is arranged at one end of the transmission frame away from the x-direction moving plate, and the output end of the z-direction driving member penetrates into the transmission frame. The driving belt pulley is arranged at the output end of the z-direction driving member. The driven belt pulley is arranged at one end of the screw in the z-direction screw pair. The belt is sleeved on the outer walls of the driving belt pulley and the driven belt pulley.

9. The test bench for on-line detection of abnormal noise directly excited on an automobile body according to claim 8, characterized in that: The x-direction driving member, the y-direction driving member, and the z-direction driving member are all arranged as servo motors.

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