Stretching detection device for automobile sound-absorbing cotton processing

Abstract

The invention relates to the technical field of automobile sound-absorbing cotton detection, and particularly discloses a stretching detection device for automobile sound-absorbing cotton processing, which comprises an identification structure, a stretching device and a fixing device, and is characterized in that the identification structure is used for detecting the offset of the automobile sound-absorbing cotton after stretching; the stretching device is arranged at the front end of the top face of the bottom of the recognition structure and can synchronously stretch the two ends of the automobile sound-absorbing cotton. The number of the fixing devices is two, the two fixing devices are symmetrically arranged at the two output ends of the stretching device correspondingly, the two fixing devices can fix the two ends of the automobile sound-absorbing cotton, and the fixing devices have universality and can be suitable for automobile sound-insulating cotton of different thicknesses; the fixing device can be matched with the stretching device to carry out cotton stretching detection on automobile sound absorbers with different thicknesses; according to the invention, the stability, the detection precision and the detection quality of automobile sound-absorbing cotton detection data are effectively improved, and a reliable basis is provided for sound-absorbing cotton processing quality judgment.

Description

Technical Field

[0001] This invention relates to the field of automotive sound-absorbing cotton testing technology, specifically a tensile testing device for automotive sound-absorbing cotton processing. Background Technology

[0002] Automotive sound-absorbing cotton is a core component for improving the quietness of the vehicle interior. Its tensile properties directly determine its installation compatibility and service life. Therefore, high-precision tensile testing is a key step in the production of sound-absorbing cotton. Existing testing devices mostly use single-end drive or asynchronous tensile mechanisms, which can easily lead to uneven force on both ends of the sound-absorbing cotton and deviations in tensile speed. This not only undermines the stability of the test but also distorts the data, increases the risk of misjudgment of quality, and poses hidden dangers to automobile production. At the same time, existing fixing devices lack an efficient offset correction mechanism. When the sound-absorbing cotton is stretched, vertical offset is easily generated. Traditional manual or mechanical adjustment methods have a lag in response and low accuracy, and cannot be reset in real time, further aggravating uneven force, reducing data accuracy and quality, and may also cause damage to the sound-absorbing cotton. As sound-absorbing cotton develops towards composite and irregular shapes, the limitations of traditional devices become apparent, and there is an urgent need for an integrated testing device that combines high-precision synchronous stretching and real-time offset correction functions. Summary of the Invention

[0003] The purpose of this invention is to provide a tensile testing device for processing automotive sound-absorbing cotton, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: comprising: an identification structure, a stretching device, and a fixing device; the identification structure is used for detecting the offset during the stretching process of automotive sound-absorbing cotton; the stretching device is disposed at the bottom top front end of the identification structure, and the stretching device can simultaneously stretch both ends of the automotive sound-absorbing cotton; the fixing device consists of two sets, which are symmetrically arranged at the two output ends of the stretching device, and the two fixing devices can fix both ends of the automotive sound-absorbing cotton, and the fixing device is universal and applicable to automotive sound insulation cotton of different thicknesses; the fixing device can cooperate with the stretching device to stretch and adjust the detection of automotive sound-absorbing cotton of different thicknesses.

[0005] Preferably, in order to identify the offset caused by the stretching of the automotive sound-absorbing cotton, the identification structure includes: a support platform, an L-shaped support rod, and a vision sensor. The support platform is used to support the top surface connecting component; the L-shaped support rod is disposed at the center of the rear end of the top surface of the support platform; and the vision sensor is disposed at the front end of the inner wall of the L-shaped support rod.

[0006] Preferably, in order to simultaneously stretch both ends of the automotive sound-absorbing cotton, the stretching device includes: a rectangular block, a first chamber, a moving groove, a first driving assembly, a transmission block, a moving plate, and a detection assembly. The rectangular block is disposed at the center of the front end of the top of the supporting platform. The first chamber is formed inside the rectangular block. The bottom ends of both sides of the outer wall of the rectangular block are provided with through moving grooves, and the two moving grooves are staggered and both moving grooves extend into the first chamber. The first driving assembly is disposed at the center of the bottom surface of the inner wall of the first chamber through a first bearing. The two output ends of the first driving assembly are respectively embedded in the two moving grooves, and the two output ends of the first driving assembly can be limited to move within the moving grooves. The transmission block is disposed at the two output ends of the first driving assembly. The moving plates are symmetrically disposed on one side of the outer wall of the transmission block. The detection assembly is disposed at the center of the top surface of the outer wall of the rectangular block.

[0007] Preferably, in order to drive the two moving plates to move synchronously, the first driving assembly includes: a gear, a flat brake motor, a rack, and an L-shaped limiting block. The gear is disposed at the center of the bottom surface of the inner wall of the first chamber via a first bearing; the flat brake motor is disposed at the center of the top surface of the inner wall of the first chamber, and the output end of the flat brake motor is connected and fixed to the center of the top surface of the gear; there are two racks, which are staggered and disposed on the outer wall of the gear, and one end of each rack is embedded in one of the two moving slots, and one end of each rack can be limited within the two moving slots. The movement is achieved by connecting and fixing one end of each of the two racks to one side of the outer wall of each of the two transmission blocks, with both racks meshing with gears; L-shaped limiting blocks are staggered and fitted onto the outer wall center near the two racks, with both ends of the L-shaped limiting blocks fixedly connected to the inner walls of the first chamber and the bottom surface of the inner wall of the first chamber, respectively; the two racks can move along the inner walls of the two L-shaped limiting blocks; the flat brake motor can drive the gear to rotate, causing the gear to drive the two racks to move in a limited position, thereby driving the two transmission blocks and the two moving plates to move in a limited position.

[0008] Preferably, in order to detect whether the stretched automotive sound-absorbing cotton is qualified, the detection component includes: a servo electric cylinder and a pressure sensor. The servo electric cylinder is located at the center of the top surface of the outer wall of the rectangular block; the pressure sensor is located at the pushing end of the servo electric cylinder, and the servo electric cylinder can drive the pressure sensor to move up and down to a limit position.

[0009] Preferably, in order to fix automotive sound-absorbing cotton of different thicknesses, the fixing device includes: a rectangular block, a second chamber, a second drive assembly, a concave clamp, a circular groove, small electric push rods, and clamping plates. The rectangular block is disposed at the top of the movable plate, and the second chamber is formed inside the rectangular block. The second drive assembly is disposed at the center of one side of the inner wall of the second chamber through a second bearing. The concave clamp is disposed at the output end of the second drive assembly, and a through circular groove is formed at the center of both the upper and lower surfaces of the concave clamp. There are two small electric push rods, which are respectively fitted into the two circular grooves, and the two small electric push rods extend outwards by a portion. There are two clamping plates, which are respectively disposed at the pushing ends of the two small electric push rods, and one side of the outer wall of the two clamping plates contacts the two sides of the inner wall of the concave clamp.

[0010] Preferably, to level the automotive sound-absorbing cotton that shifts during the stretching process, the second drive assembly includes: a rotating column, a turbine, a bearing housing, a worm gear, and a brake motor. The rotating column is disposed on one side of the inner wall of the second chamber via a second bearing. One end of the rotating column is fixedly connected to one side of the outer wall of the concave clamp, and the other end of the rotating column extends into the second chamber. The turbine is disposed at the other end of the rotating column. There are two bearing housings, symmetrically disposed at the bottom end of one side of the inner wall of the second chamber, with a certain distance between the two bearing housings. The worm gear is disposed between the rotating ends of the two bearing housings, and the worm gear meshes with the turbine gear. The brake motor is disposed at the bottom front end of the inner wall of the second chamber, and the output end of the brake motor is fixedly connected to the center of one end of the worm gear. The brake motor can drive the worm gear to rotate, causing the worm gear to drive the turbine gear to rotate, thereby driving the concave clamp to rotate.

[0011] Compared with the prior art, the beneficial effects of the present invention are: 1. The stretching device of this apparatus adopts a gear-rack coordinated transmission structure. A flat brake motor drives the gear to rotate, which in turn drives two sets of misaligned racks to move synchronously in opposite directions along the moving groove, thereby achieving symmetrical synchronous stretching of the two moving plates. Compared with traditional single-end drive or asynchronous stretching mechanisms, this design eliminates tooth backlash through pre-tightening gears, effectively avoiding uneven force and inconsistent stretching speed at both ends of the sound-absorbing cotton during the stretching process, ensuring that the sound-absorbing cotton is always in a stable and uniform stretching state. This high-precision synchronous stretching characteristic directly improves the authenticity and stability of the test data, providing a reliable basis for judging the processing quality of the sound-absorbing cotton and reducing the risk of misjudgment caused by stretching errors.

[0012] 2. The fixing device, through a combination of a small electric push rod and a clamping plate, securely holds sound-absorbing cotton of different thicknesses. The device innovatively combines a vision sensor with a worm gear drive structure, constructing a closed-loop control system for detection, feedback, and adjustment. The vision sensor, installed directly above the two fixing devices, can capture the position of the sound-absorbing cotton in real time during the stretching process, accurately identifying any deviation along the vertical direction of stretching. When a deviation is detected, the vision sensor immediately sends a control signal to the brake motor on the corresponding side, driving the worm gear to rotate the turbine, which in turn drives the rotating column and concave clamp to finely adjust their angles, precisely resetting the deviated sound-absorbing cotton to the detection plane. The worm gear drive features a large transmission ratio, smooth operation, and good self-locking properties, enabling micron-level angle adjustments. This effectively solves the problems of low deviation adjustment accuracy and lag response in traditional devices, ensuring that the sound-absorbing cotton remains in the optimal detection position throughout the entire testing process, significantly improving the accuracy of the stretching test. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure for identifying the present invention; Figure 3 This is a schematic diagram of the structure of the stretching device of the present invention; Figure 4 This is a schematic diagram of the rectangular block cross-sectional structure of the stretching device of the present invention; Figure 5 This is a schematic diagram of the internal structure of the rectangular block of the present invention in cross-section; Figure 6 This is a schematic diagram of the disassembled structure of the gear and the first bearing within the first drive assembly of the present invention; Figure 7 This is a schematic diagram of the fixing device of the present invention; Figure 8 for Figure 7 Enlarged view of point A in the image; Figure 9 This is a cross-sectional internal structure diagram of the rectangular block of the present invention; Figure 10 This is a schematic diagram of the cross-sectional split structure of the rectangular block of the present invention.

[0014] In the diagram: 1. Recognition structure; 11. Support platform; 12. L-shaped support rod; 13. Vision sensor; 2. Tensioning device; 21. Rectangular block; 22. First chamber; 23. Moving groove; 24. First drive assembly; 241. Gear; 242. Flat brake motor; 243. Rack; 244. L-shaped limit block; 25. Transmission block; 26. Moving plate; 27. Servo electric cylinder; 28. Pressure sensor; 3. Fixing device; 31. Rectangular block; 32. Second chamber; 33. Second drive assembly; 331. Rotating column; 332. Turbine; 333. Bearing seat; 334. Worm gear; 335. Brake motor; 34. Concave clamp; 35. Circular groove; 36. Small electric push rod; 37. Clamping plate. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] Please see Figures 1-10 This invention provides a technical solution for a tensile testing device for automotive sound-absorbing cotton processing: It includes an identification structure 1, a tensile device 2, and a fixing device 3. The identification structure 1 is used to detect the offset during the tensile process of the automotive sound-absorbing cotton, and also provides stable support for the tensile device 2 and the fixing device 3, and provides mounting points for them. The tensile device 2 is located at the bottom, top, and front ends of the identification structure 1. The tensile device 2 can simultaneously stretch both ends of the automotive sound-absorbing cotton. Compared with traditional tensile methods, the simultaneous tensile stretching of the tensile device 2 is more accurate, thus ensuring the processing quality of the sound-absorbing cotton. Two sets of fixing devices 3 are symmetrically arranged at the two output ends of the tensile device 2. The two fixing devices 3 can fix both ends of the automotive sound-absorbing cotton, and are versatile enough to be used for automotive sound insulation cotton of different thicknesses. The fixing devices 3 can cooperate with the tensile device 2 to stretch and adjust the automotive sound-absorbing cotton of different thicknesses. The fixing devices 3 can also perform high-precision adjustment of the automotive sound-absorbing cotton that offsets during the tensile process, thereby achieving high-precision tensile testing of the automotive sound-absorbing cotton.

[0017] As a preferred option, further, such as Figure 2As shown, the identification structure 1 includes: a support platform 11, an L-shaped support rod 12, and a vision sensor 13. The support platform 11 supports the top surface connecting component, ensures the stable operation of the top surface connecting component, and provides an installation point for the top surface connecting component. The L-shaped support rod 12 is located at the center of the rear end of the top surface of the support platform 11. The L-shaped support rod 12 supports the vision sensor 13, and the vision sensor 13 is located directly above the center between the two fixing devices 3, thereby ensuring the detection quality and accuracy of the automotive sound-absorbing cotton that deviates during the stretching process. The vision sensor 13 is located at the front end of the top surface of the inner wall of the L-shaped support rod 12. The vision sensor 13 is used to identify and detect the automotive sound-absorbing cotton that deviates during the stretching process. The vision sensor 13 is electrically connected to two brake motors 335 and provides a power source signal to the two brake motors 335, thereby adjusting the deviated automotive sound-absorbing cotton.

[0018] As a preferred option, further, such as Figure 3 , Figure 4 and Figure 5 As shown, the tensioning device 2 includes: a rectangular block 21, a first chamber 22, a moving groove 23, a first drive assembly 24, a transmission block 25, a moving plate 26, and a detection assembly. The rectangular block 21 is located at the center of the front end of the top face of the bearing platform 11. The rectangular block 21 is used to stably support the servo electric cylinder 27. The first chamber 22 is formed inside the rectangular block 21, which provides installation space for the first drive assembly 24. The bottom ends of both sides of the outer wall of the rectangular block 21 are provided with through moving grooves 23, and the two moving grooves 23 are staggered and both of them extend into the first chamber 22. The first drive assembly 24 is set at the center of the bottom surface of the inner wall of the first chamber 22 through a first bearing. The two... The output ends are respectively embedded in two moving slots 23, and the two output ends of the first drive component 24 can be limited to move within the moving slots 23. The transmission blocks 25 are respectively set on the two output ends of the first drive component 24. The two transmission blocks 25 are not only used for transmission between the two output ends of the first drive component 24 and the two moving plates 26, but also for extending the two moving plates 26 to make them symmetrical. The moving plates 26 are respectively symmetrically set on one side of the outer wall of the transmission blocks 25. The two moving plates 26 are respectively used to support and extend the fixing device 3, and leave operating space for the servo electric cylinder 27 and the pressure sensor 28. The detection component is set at the center of the top surface of the outer wall of the rectangular block 21. The detection component is used to detect whether the stretching of the automotive sound-absorbing cotton is qualified.

[0019] As a preferred option, further, such as Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, the first drive assembly 24 includes: a gear 241, a flat brake motor 242, a rack 243, and an L-shaped limiting block 244. The gear 241 is mounted on the center of the bottom surface of the inner wall of the first chamber 22 via a first bearing, and the gear 241 can be limited to rotate by the first bearing. The flat brake motor 242 is mounted on the center of the top surface of the inner wall of the first chamber 22, and the output end of the flat brake motor 242 is connected and fixed to the center of the top surface of the gear 241. The flat brake motor 242 is small in size, which facilitates the compact application of this structure. The flat brake motor 242 has a certain self-locking capability to prevent the output end connecting parts from shifting or loosening due to external force. There are two racks 243, which are staggered on the outer wall of the gear 241. One end of each rack 243 is embedded in one of two moving slots 23, and one end of each rack 243 can be limited to move within the two moving slots 23. One end of each rack 243 is connected to one of two transmission blocks 25. One side of the outer wall is fixed, and the two racks 243 mesh with the gear 241. The L-shaped limiting blocks 244 are staggered and sleeved on the outer wall center near the two racks 243. The two L-shaped limiting blocks 244 also have a certain limiting support function for the two racks 243. The two ends of the L-shaped limiting blocks 244 are fixedly connected to the two sides of the inner wall of the first chamber 22 and the bottom surface of the inner wall of the first chamber 22, respectively. The two racks 243 can move along the inner wall of the two L-shaped limiting blocks 244. The flat brake motor 242 can drive the gear 241 to rotate, so that the gear 241 drives the two racks 243 to move in a limited position. Thus, the two racks 243 drive the two transmission blocks 25 and the two moving plates 26 to move in a limited position. The first drive assembly 24 can eliminate the tooth backlash through the transmission of the gear 241 and the two racks 243, and thus drive the high-quality and high-precision synchronous stretching of the two ends of the automotive sound-absorbing cotton.

[0020] As a preferred option, further, such as Figure 3As shown, the detection components include a servo electric cylinder 27 and a pressure sensor 28. The servo electric cylinder 27 is located at the center of the top surface of the outer wall of the rectangular block 21. The servo electric cylinder 27 is controlled by a closed-loop servo motor and driven by a precision ball screw, achieving a repeatability accuracy down to the micrometer level. It can realize high-precision linear drive and displacement control of the pressure sensor 28. The pressure sensor 28 is located at the pushing end of the servo electric cylinder 27. The servo electric cylinder 27 can drive the pressure sensor 28 to move up and down to a limit position. The pressure sensor 28 can detect whether the stretching of the automotive sound-absorbing cotton is qualified. The automotive sound-absorbing cotton is mostly made of porous flexible materials such as polyester fiber and glass fiber. When the core structure is subjected to axial stretching, the stress is mainly concentrated in the core area because the skin structure is dense and the molecular chain is strongly oriented, while the core structure is loose and the molecular chain is more random. During the directional extension of the fiber bundle and the reconstruction of the internal pores, the volume redistribution effect in the central area is the most significant. Its radial expansion perpendicular to the stretching direction is higher than that of the edge. The pressure sensor can accurately capture the expansion deformation signal of this central area, thereby detecting whether the stretching of the automotive sound-absorbing cotton is qualified.

[0021] As a preferred option, further, such as Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, the fixing device 3 includes: a rectangular block 31, a second chamber 32, a second drive assembly 33, a concave clamp 34, a circular groove 35, a small electric push rod 36, and a clamping plate 37. The rectangular block 31 is disposed at the top of the movable plate 26. The second chamber 32 is formed inside the rectangular block 31, and the second chamber 32 is used to provide installation space for the second drive assembly 33. The second drive assembly 33 is disposed at the center of one side of the inner wall of the second chamber 32 via a second bearing. The concave clamp 34 is disposed at the output end of the second drive assembly 33. Both the upper and lower surfaces have through circular grooves 35 at their centers; there are two small electric push rods 36, which are respectively fitted into the two circular grooves 35, and each of the two small electric push rods 36 extends outwards. The two small electric push rods 36 are used to drive the two clamping plates 37 to limit linear movement; there are two clamping plates 37, which are respectively set at the pushing end of the two small electric push rods 36. One side of the outer wall of the two clamping plates 37 is in contact with the two sides of the inner wall of the concave clamp 34. The two clamping plates 37 are used to fix the automotive sound-absorbing cotton.

[0022] As a preferred option, further, such as Figure 9 and Figure 10As shown, the second drive assembly 33 includes: a rotating column 331, a turbine 332, a bearing housing 333, a worm gear 334, and a brake motor 335. The rotating column 331 is disposed on one side of the inner wall of the second chamber 32 via a second bearing. One end of the rotating column 331 is connected and fixed to one side of the outer wall of the concave clamp 34, and the other end of the rotating column 331 extends into the second chamber 32. The rotating column 331 is used to support the concave clamp 34 and the turbine 332, and the rotating column 331 is also used for transmission between the concave clamp 34 and the turbine 332. The turbine 332 is located at the other end of the rotating column 331; there are two bearing seats 333, which are symmetrically arranged on one side of the bottom of the inner wall of the second chamber 32, and there is a certain distance between the two bearing seats 333. The two bearing seats 333 are also used to support the worm 334; the worm 334 is located between the rotating ends of the two bearing seats 333, and the worm 334 can be limited to rotate by the two bearing seats 333. The worm 334 meshes with the turbine 332, and the rotation of the worm 334 can drive the turbine 332 to be limited to rotate. The brake motor 335 is located at the bottom front end of the inner wall of the second chamber 32. The output end of the brake motor 335 is fixedly connected to one end of the worm gear 334. The brake motor 335 has a certain self-locking capability, which can prevent the output end connection component from shifting or loosening due to external force, thereby preventing the car sound insulation cotton from shifting or loosening. The brake motor 335 can drive the worm gear 334 to rotate, which in turn drives the turbine 332 to rotate the rotating column 331. The rotating column 331 then drives the concave clamp 34 to rotate. This second drive assembly, through the drive method of the turbine 332 and the worm gear 334, is suitable for use in high-precision environments. The cooperation between the turbine 332 and the worm gear 334 can accurately adjust the offset car sound insulation cotton back to the plane.

[0023] The detailed connection method is a well-known technology in the field. The working principle and process are mainly introduced below. The specific work is as follows: the two ends of the car sound-absorbing cotton are placed between the four clamping plates 37 by the robotic arm. The four clamping plates 37 are driven synchronously by the four small electric push rods 36 to clamp and fix the two ends of the car sound-absorbing cotton. This structure is suitable for fixing car sound-absorbing cotton of any thickness. Once the automotive sound-absorbing cotton is secured, the pressure sensor 28 is moved upward by the servo electric cylinder 27, so that the pressure sensor 28 comes into contact with the bottom center of the automotive sound-absorbing cotton. Then, the two moving plates 26 are driven to expand outward synchronously by the flat brake motor 242, thereby stretching the automotive sound-absorbing cotton through the two fixing devices 3. The automotive sound-absorbing cotton is mostly made of porous flexible materials such as polyester fiber and glass fiber. When subjected to axial stretching, the volume redistribution effect of the central region is the most significant during the process of fiber bundle directional extension and internal pore reconstruction. Its radial expansion perpendicular to the stretching direction is higher than that of the edge part. Then, the pressure sensor 28 is squeezed through the central expansion part to perform stretching detection on the automotive sound-absorbing cotton. Meanwhile, when the automotive sound-absorbing cotton is stretched laterally, it is easy for it to deviate in the vertical direction of stretching. The visual sensor 13 then detects the automotive sound-absorbing cotton in real time. Since the two concave clamps 34 are driven independently by two brake motors 335, and the end of the automotive sound-absorbing cotton that deviates during the stretching process can be adjusted by a high-precision drive rotation of a set of second drive components 33, the pressure sensor 28 is used to detect whether the automotive sound-absorbing cotton is qualified. Moreover, this invention is applicable to the stretching detection of automotive sound-absorbing cotton of any thickness and has a certain degree of versatility and improves the quality and accuracy of stretching detection of automotive sound-absorbing cotton.

[0024] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tensile testing device for processing automotive sound-absorbing cotton, characterized in that, include: Identification structure (1), a device for detecting the offset during the stretching process of automotive sound-absorbing cotton; A stretching device (2) is provided at the bottom top front end of the identification structure (1), and the stretching device (2) can simultaneously stretch both ends of the automotive sound-absorbing cotton. The fixing device (3) consists of two sets, which are symmetrically arranged at the two output ends of the stretching device (2). The two fixing devices (3) can fix both ends of the automotive sound-absorbing cotton, and the fixing device (3) is versatile and can be used for automotive sound-absorbing cotton of different thicknesses. The fixing device (3) can cooperate with the stretching device (2) to stretch and adjust the automotive sound-absorbing cotton of different thicknesses.

2. The tensile testing device for processing automotive sound-absorbing cotton according to claim 1, characterized in that: The identification structure (1) includes: The support platform (11) is used to support the top surface connecting components; L-shaped support rod (12) is provided at the center of the rear end of the top surface of the bearing platform (11); A vision sensor (13) is disposed on the front end of the inner wall of the L-shaped support rod (12).

3. The tensile testing device for processing automotive sound-absorbing cotton according to claim 2, characterized in that: The stretching device (2) includes: A rectangular block (21) is set at the center of the front end of the top of the bearing platform (11). A first chamber (22) is opened inside the rectangular block (21). A through moving groove (23) is opened at the bottom end of both sides of the outer wall of the rectangular block (21). The two moving grooves (23) are staggered and both moving grooves (23) are connected to the first chamber (22). The first drive assembly (24) is disposed at the center of the bottom surface of the inner wall of the first chamber (22) via the first bearing. The two output ends of the first drive assembly (24) are respectively embedded in the two moving slots (23). The two output ends of the first drive assembly (24) can be limited to move within the moving slots (23). Transmission blocks (25) are respectively disposed at the two output ends of the first drive assembly (24); The movable plates (26) are symmetrically arranged on one side of the outer wall of the transmission block (25); The detection component is located at the center of the top surface of the outer wall of the rectangular block (21).

4. The tensile testing device for processing automotive sound-absorbing cotton according to claim 3, characterized in that: The first driving component (24) includes: The gear (241) is disposed at the center of the bottom surface of the inner wall of the first chamber (22) via the first bearing; A flat brake motor (242) is disposed at the center of the top surface of the inner wall of the first chamber (22), and the output end of the flat brake motor (242) is connected and fixed to the center of the top surface of the gear (241); Two racks (243) are staggered on the outer wall of the gear (241). One end of each rack (243) is embedded in one of the two moving slots (23). One end of each rack (243) can move within the two moving slots (23). One end of each rack (243) is connected and fixed to one side of the outer wall of each of the two transmission blocks (25). Both racks (243) mesh with the gear (241). L-shaped limiting blocks (244) are staggered and fitted onto the outer wall center of the two racks (243). The two ends of the L-shaped limiting blocks (244) are fixedly connected to the inner wall sides of the first chamber (22) and the bottom surface of the inner wall of the first chamber (22), respectively. The two racks (243) can be limited and moved along the inner wall of the two L-shaped limiting blocks (244).

5. The tensile testing device for processing automotive sound-absorbing cotton according to claim 4, characterized in that, The flat brake motor (242) can drive the gear (241) to rotate, so that the gear (241) drives the two racks (243) to move in a limited position, thereby the two racks (243) drive the two transmission blocks (25) and the two moving plates (26) to move in a limited position respectively.

6. The tensile testing device for processing automotive sound-absorbing cotton according to claim 5, characterized in that: The detection component includes: A servo electric cylinder (27) is located at the center of the top surface of the outer wall of the rectangular block (21); A pressure sensor (28) is disposed at the pushing end of the servo electric cylinder (27), which can drive the pressure sensor (28) to move up and down to a limit.

7. The tensile testing device for processing automotive sound-absorbing cotton according to claim 6, characterized in that: The fixing device (3) includes: A rectangular block (31) is disposed at the top of the movable plate (26), and a second chamber (32) is provided inside the rectangular block (31). The second drive assembly (33) is disposed at the center of one side of the inner wall of the second chamber (32) via a second bearing; A concave clip (34) is disposed at the output end of the second drive component (33), and a through circular groove (35) is provided at the center of both the upper and lower surfaces of the concave clip (34). There are two small electric push rods (36), which are respectively fitted into the two circular slots (35), and the two small electric push rods (36) extend outwards respectively. There are two clamps (37), which are respectively set at the pushing end of the two small electric push rods (36). One side of the outer wall of the two clamps (37) is in contact with the two sides of the inner wall of the concave clamp (34).

8. The tensile testing device for processing automotive sound-absorbing cotton according to claim 7, characterized in that: The second driving component (33) includes: A rotating column (331) is disposed on one side of the inner wall of the second chamber (32) via a second bearing. One end of the rotating column (331) is connected and fixed to one side of the outer wall of the concave clamp (34), and the other end of the rotating column (331) extends into the second chamber (32). A turbine (332) is disposed at the other end of the rotating column (331); There are two bearing seats (333), which are symmetrically arranged on one side of the bottom of the inner wall of the second chamber (32), and there is a certain distance between the two bearing seats (333); A worm (334) is disposed between the rotating ends of the two bearing seats (333), and the worm (334) meshes with the turbine (332); A brake motor (335) is located at the bottom front end of the inner wall of the second chamber (32), and the output end of the brake motor (335) is fixedly connected to one end of the worm gear (334).

9. A tensile testing device for processing automotive sound-absorbing cotton according to claim 8, characterized in that, The brake motor (335) can drive the worm (334) to rotate, so that the worm (334) drives the turbine (332) to rotate the rotating column (331), thereby the rotating column (331) drives the concave clamp (34) to rotate.

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