An experimental test method and apparatus for determining the impact resistance of a fabric

Abstract

The present application relates to the technical field of fabric testing, in particular to an experimental test method and device for determining the impact resistance of fabric, comprising the following steps: S1: initial calibration, installing the fabric to be tested on a fabric frame, adjusting the tension of the fabric to be tested to a set value by a first electric push rod, starting the electromagnetic suction table compression spring to the energy storage state, launching the projectile to impact the pressure sensor array module under no load, repeating 3 times, obtaining the impact force calibration value, and synchronously calibrating the speed sensor, S2: test position switching, injecting liquid agar gel into the transparent gel cylinder. Through the unique spring system, the electromagnetic suction table is moved by using the linear transmission module, the spring stretching amount is accurately controlled, and the precise adjustment of the projectile launching speed is realized, which enables the simulation of various speed impacts when testing the impact resistance of the fabric.

Description

Technical Field

[0001] This invention relates to the field of fabric testing technology, specifically to an experimental testing method and apparatus for determining the impact resistance of fabrics. Background Technology

[0002] In the field of fabric impact resistance testing, existing technologies have many problems that limit the accurate evaluation and research of fabric performance, as follows:

[0003] 1. Projectile velocity control problem: In traditional testing devices, the projectile velocity is difficult to control precisely, and it is impossible to simulate impact scenarios at various speeds when testing the impact resistance of fabrics;

[0004] 2. Issues with changing the fabric test area and acquiring data: In traditional fabric impact resistance testing, it is inconvenient to change the fabric test area and it is difficult to automatically and repeatedly acquire multiple sets of valid data.

[0005] 3. Environmental factors: Existing testing methods often ignore the influence of ambient temperature and humidity and fabric tension on the impact resistance of fabrics;

[0006] 4. Projectile recovery problem: Existing technologies make projectile recovery difficult. After the projectile is launched, it needs to be manually recovered, which increases the experimental operation steps and time costs, and reduces experimental efficiency.

[0007] 5. Gel usage issues: In previous tests, the gel could not be reused. After each test, the damaged gel was discarded directly, resulting in resource waste and increased experimental costs. Frequent gel replacement not only consumed materials but also required a lot of time for preparation, leading to low experimental efficiency and hindering the continuous testing and research of the fabric's impact resistance.

[0008] Based on this, the present invention provides an experimental testing method and apparatus for determining the impact resistance of fabrics to solve the problems mentioned in the background art. Summary of the Invention

[0009] This invention addresses the technical problems existing in the prior art by providing an experimental testing method and apparatus for determining the impact resistance of fabrics. This solves the problems of existing apparatuses being inconvenient for controlling projectile velocity, changing fabric test areas, and rapidly acquiring multiple sets of data.

[0010] The technical solution of this invention to solve the above-mentioned technical problems is as follows: An experimental testing method for determining the impact resistance of fabrics, comprising the following steps:

[0011] S1: Initial calibration. The fabric to be tested is installed on the fabric rack. The tension of the fabric to be tested is adjusted to the set value by the first electric push rod. The electromagnetic suction table is activated to compress the spring to the energy storage state. The unloaded projectile is launched to impact the pressure sensor array module. This is repeated 3 times to obtain the impact force calibration value and to simultaneously calibrate the speed sensor.

[0012] S2: Test position switching, liquid agar gel is injected into the transparent gel tube, cooled to 30°C by a semiconductor cooler to solidify it, and the servo motor is driven to rotate the solidified gel tube to the test position coaxial with the emitter tube;

[0013] S3: Impact data acquisition, releases a projectile to impact the surface of the fabric under test, simultaneously triggers a high-speed camera to record fabric deformation, and uses the image difference between two visual sensors to detect the fabric damage state.

[0014] S4: Recovery and impact test. Start the winding wheel and motor to tighten the traction wire. Guided by the rounded corners of the conical cover, pull the projectile back to the initial position of the launching tube. Control the winding motor to drive the fabric to move 10CM. Repeat step S3 to continuously test the non-impacted area. Accumulate 3 to 5 impacts. During the impact test, the temperature and humidity of the fabric under test can be set through the first temperature simulation device and the atomizing nozzle.

[0015] S5: Damage assessment and cyclic recovery. After each impact, the area of ​​the gel crack is analyzed by a high-speed camera. If it exceeds 5 mm², the gel tube is replaced. The damaged gel is heated to 60°C by a second temperature simulation device to liquefy it. It is then re-injected into the gel tube and cooled to 30°C for reuse.

[0016] Based on the above technical solution, the present invention can be further improved as follows.

[0017] An experimental testing apparatus for determining the impact resistance of fabrics includes a support frame and further includes:

[0018] The projectile is streamlined in shape.

[0019] A spring system allows for adjustable projectile speed by changing the amount of spring tension.

[0020] Recovery system, used for the automatic recovery of launched projectiles;

[0021] The fabric release system is used to repeatedly release and replace the fabric under test and to adjust the tension, temperature and humidity of the fabric under test.

[0022] The gel system, using agar gel as a backing, is used to test the impact force of projectiles, measure projectile penetration, and enable the reuse of agar gel.

[0023] Furthermore, the spring system includes a linear transmission module and a launching tube mounted on a bracket. An electromagnetic suction platform is driven and mounted on the linear transmission module. A launching seat is slidably mounted on the inner wall of the launching tube. The launching seat contains a permanent magnet that cooperates with the electromagnetic suction platform. A spring that limits the launching tube is mounted on the back of the launching seat. A guide tube is connected to the end of the launching tube. The projectile is slidably mounted in the guide tube. A pin that cooperates with the projectile is fixedly mounted on the launching seat.

[0024] The beneficial effects of adopting the above-mentioned further scheme are that, during the ejection energy storage, the linear transmission module drives the electromagnetic suction platform to move, and the electromagnetic suction platform attracts the permanent magnet in the launch seat. The compressed spring stores elastic potential energy. When the electromagnetic suction platform is de-energized and loses its magnetic attraction, the spring rebounds and pushes the launch seat forward. The ejector pin on the launch seat pushes the projectile out of the guide tube. This structure changes the spring tension by controlling the position of the electromagnetic suction platform, thereby achieving precise adjustment of the projectile launch speed. This solves the problem of the projectile speed being difficult to control precisely in traditional testing devices. It enables the simulation of impact conditions at different speeds when testing the impact resistance of fabrics, improving the accuracy and comprehensiveness of the test results, and providing strong support for studying the performance of fabrics under different impact speeds.

[0025] The linear drive module includes a drive motor and a lead screw driven by the drive motor. The drive motor has a built-in encoder, which precisely controls the retraction stroke of the projectile and thus precisely controls the energy storage intensity of the projectile.

[0026] Furthermore, the recovery system includes a reel and a guide wheel rotatably connected to the launch tube. A motor is mounted on the launch tube, the output shaft of which is fixedly connected to the reel, and a traction wire is wound on the reel. The guide wheel is in contact with the traction wire, and the other end of the traction wire is fixedly connected to the projectile. A wire-passing hole is fixedly opened at the tail of the launch tube for the traction wire to pass through. A conical cover is connected to the end of the launch tube. The connection between the conical cover and the launch tube, as well as the outer edge of the tail of the projectile, are rounded. A speed sensor is mounted on the conical cover. The data terminal of the speed sensor is electrically connected to a PLC controller, and the test axis of the speed sensor is perpendicular to the axis of the launch tube.

[0027] The beneficial effect of adopting the above-mentioned further scheme is that the traction wire is fully released before the projectile stores energy, allowing the projectile to move freely;

[0028] After the projectile is launched, the reel and motor are activated. The reel rotates under the drive of the motor, tightening the traction wire. Since one end of the traction wire is fixed to the projectile and guided by the guide wheel, it can stably pull the projectile back. The conical cover at the end of the launch tube and the rounded corners at the tail of the projectile effectively reduce the resistance during the projectile traction process, making the recovery process smoother. The velocity sensor is installed on the conical cover, perpendicular to the axis of the launch tube, which can accurately measure the projectile launch velocity and transmit the data to the PLC controller. This system solves the problems of difficulty in recovering the projectile after launch and inability to accurately obtain the launch velocity, realizes the automatic recovery of the projectile, improves the experimental efficiency, and provides accurate velocity data for analyzing the energy of the projectile impacting the fabric, improving the reliability of the experimental data. Furthermore, through the realization of the projectile recovery function, continuous impact testing of the fabric under test and repeated replacement testing of the fabric under test can be quickly realized, thereby effectively improving the automation level of this device.

[0029] Furthermore, the fabric release system includes a fabric to be tested and a fabric rack slidably connected to a support. A set of first electric push rods is installed between the fabric rack and the support. A tension adjustment frame is slidably installed on the fabric rack. A set of pressure probes is installed between the fabric rack and the tension adjustment frame. A winding roller is rotatably installed on both the fabric rack and the tension adjustment frame. A winding motor is installed on the side of both the fabric rack and the tension adjustment frame. The output shafts of the two winding motors are respectively fixedly connected to the two winding rollers. The two ends of the fabric to be tested are respectively fixedly installed on the two winding rollers. Two guide rollers are rotatably installed on the inner wall of the fabric rack. Both guide rollers are in contact with the fabric to be tested. Two vision sensors are installed on the fabric rack, facing the fabric to be tested. The two vision sensors are respectively located on the upper and lower sides of the guide tube.

[0030] The beneficial effect of adopting the above-mentioned further solution is that the first electric push rod installed between the fabric frames can adjust the distance between the fabric frames and the launching tube, thereby adjusting the impact force of the projectile on the fabric to be tested.

[0031] By driving the two winding motors separately, the tension of the fabric under test between the two rollers can be adjusted, and the pressure probe monitors the tension in real time to ensure that the tension is stable at the set value.

[0032] By adjusting the tension, the stretch and tension of the fabric under test can be preset and the actual use conditions can be simulated. By adjusting the tension, test errors caused by the fabric being too loose or too tight can be avoided, and the comparability of data can be improved.

[0033] The winding motors on the fabric rack and tension adjustment rack drive the rollers to rotate, thereby enabling the fabric to be tested to be unwound and retracted, facilitating the replacement of the test area.

[0034] By enabling the replacement of the test area of ​​the fabric under test, continuous automatic repeated testing of the test area can be facilitated, thereby obtaining multiple sets of experimental data and improving the testing accuracy of the fabric under test.

[0035] Guide wheels ensure the fabric remains stable during movement, and vision sensors are located on the upper and lower sides of the guide tube to monitor the fabric surface condition in real time.

[0036] By detecting the difference in images from two vision sensors, the damage condition and degree of damage to the fabric under impact can be monitored.

[0037] Furthermore, it also includes a first temperature simulation device and a pump tank mounted on the bracket, an atomizing pump mounted on the pump tank, an atomizing nozzle mounted on the fabric rack, the atomizing nozzle facing the roller on the fabric rack, and the mist outlet of the atomizing pump connected to the atomizing nozzle via a flexible hose.

[0038] The beneficial effects of adopting the above-mentioned further scheme are that the first temperature simulation device can adjust the ambient temperature according to the experimental requirements. The liquid in the pump tank is sprayed into a mist through the atomizing nozzle onto the roller on the fabric rack under the action of the atomizing pump, thereby adjusting the humidity of the fabric to be tested. During the impact test, it can create different temperature and humidity environments for the fabric to be tested, solving the problem that traditional tests ignore the influence of ambient temperature and humidity on the impact resistance of fabrics. This makes the test results more in line with actual use scenarios, improves the practicality and accuracy of the experiment, and helps to study the change law of the impact resistance of fabrics under different temperature and humidity conditions.

[0039] Furthermore, the gel system includes a slide slidably connected to a support, a set of second electric actuators installed between the slide and the fabric frame, a sealing shell mounted on the slide, a through pipe connected to the sealing shell and positioned opposite the transmitting tube, a rotating ring and a rotating frame rotatably mounted on the inner wall of the sealing shell, a rotary motor mounted on the sealing shell, the output shaft end of the rotary motor fixedly connected to the rotating frame, two gel cylinders rotatably connected to the inner wall of the rotating ring, the tail ends of the two gel cylinders rotatably connected to the rotating frame, and agar gel stored inside the two gel cylinders, a second temperature simulation device and a semiconductor cooler respectively mounted on the sealing shell and above the gel cylinders, a drive module for driving the rotation of the gel cylinders provided on the sealing shell, two symmetrically arranged calibration cylinders fixedly connected to the inner wall of the rotating ring, pressure sensor array modules fixedly mounted on the inner walls of the two calibration cylinders, two high-speed cameras symmetrically mounted on the sealing shell, and the data terminals of the pressure sensor array modules and the high-speed cameras being connected to the PLC controller.

[0040] The beneficial effect of adopting the above-mentioned further solution is that the second electric push rod between the carriage and the fabric frame can adjust the relative position of the sealing shell and the launching tube. After the liquid agar gel is injected into the gel tube, the semiconductor cooler cools and solidifies it. After solidification, the gel tube rotates to the test position under the drive of the servo motor. After the projectile impacts the fabric, it acts on the gel. The high-speed camera records the gel state from the direction perpendicular to the axis of the gel tube, which is used to analyze the penetration of the projectile.

[0041] Before the projectile impacts the gel, the pressure sensor array module faces the launching tube. The projectile launched by the launching tube acts on the pressure sensor array module. The impact force calibration value of the projectile under a specified spring compression degree is obtained by repeating this process 3 times.

[0042] When the gel needs to be replaced after damage assessment, the second temperature simulation device heats the gel to liquefy it. After the gel is completely liquefied, the second temperature simulation device then controls the temperature of the gel to solidify it again, thus enabling reuse. This system solves the problems of inaccurate measurement of projectile impact force and penetration, as well as the inability to reuse the gel. It not only reduces experimental costs but also obtains more comprehensive data on the impact of projectiles on fabrics, enhancing the research value of the experiment.

[0043] Furthermore, a transmission bevel gear ring is rotatably sleeved on the rotating frame, a driven bevel gear is installed on the gel tube, the transmission bevel gear ring is connected to the driven bevel gear, a servo motor is installed on the slide, and the output shaft end of the servo motor is fixedly connected to the transmission bevel gear ring.

[0044] The beneficial effect of adopting the above-mentioned further solution is that after the servo motor starts, it drives the transmission bevel gear ring to rotate. The transmission bevel gear ring meshes with the driven bevel gear on the gel tube, thereby driving the gel tube to rotate. During the experiment, different gel tubes can be quickly switched to the test position in this way, which improves the experimental efficiency, solves the problem of inconvenient gel tube switching, reduces the experimental preparation time, makes the experimental process smoother, and helps to improve the overall experimental efficiency.

[0045] Furthermore, the axis of the high-speed camera is perpendicular to the axis of the gel tube, a set of acquisition notches are provided on the rotating ring, and the gel tube is made of transparent glass.

[0046] The advantages of adopting the above-mentioned further solution are that the axis of the high-speed camera is perpendicular to the axis of the gel tube, which can clearly capture the state of the gel after the projectile impacts it, avoiding visual errors caused by the shooting angle. The acquisition notch on the rotating ring provides the high-speed camera with a better shooting field of view, ensuring the integrity of the captured image. The transparent glass gel tube allows the high-speed camera to clearly observe the changes inside the gel, such as crack propagation and the penetration path of the projectile, solving the problem of unclear images of the inside of the gel. This provides clear image data for accurately assessing the degree of damage and penetration of the projectile on the gel, and helps to analyze the energy transfer and material damage mechanism after the projectile impacts the fabric more deeply.

[0047] The beneficial effects of this invention are:

[0048] 1. This invention utilizes a unique spring system and a linear transmission module to move the electromagnetic stage, precisely controlling the spring tension and thus accurately adjusting the projectile launch speed. This allows for the simulation of impact scenarios at various speeds when testing the impact resistance of fabrics, greatly improving the accuracy and comprehensiveness of the test results. It provides strong support for in-depth research on fabric performance under different impact velocities. In traditional fabric impact resistance testing, changing the fabric test area is inconvenient and it is difficult to automatically and repeatedly acquire multiple sets of valid data, limiting the accuracy of the test results. The fabric release system of this invention effectively solves this problem. By adjusting the distance between the fabric frame and the launch tube using a first electric push rod, the impact force on the fabric under test is changed. A winding motor drives the roller to rotate, realizing the release and take-up of the fabric under test. This facilitates the change of the fabric test area. Combined with a pressure probe to monitor tension in real time, it ensures consistent test conditions each time. It can continuously and automatically repeat testing of different areas, acquiring multiple sets of experimental data, greatly improving test accuracy and ensuring the reliability and accuracy of the test results—something traditional technologies cannot match.

[0049] 2. Existing testing methods often neglect the influence of ambient temperature and humidity on the impact resistance of fabrics, and the recovery of projectiles is difficult, resulting in low experimental efficiency. This invention not only features an automatic recovery system that uses a roller, guide wheel, and traction wire to automatically recover projectiles, reducing experimental steps and improving efficiency, but also includes a first temperature simulation device and an atomizing nozzle to create different temperature and humidity environments for the fabric under test during impact testing. Furthermore, the device incorporates a fabric tension adjustment mechanism to create variations in fabric tension during testing. This innovative design makes the test results more closely resemble actual usage scenarios, effectively addressing the shortcomings of traditional testing and significantly improving the practicality and automation of the experiment.

[0050] 3. In previous tests, gels could not be reused, resulting in resource waste and increased experimental costs. The gel system of this invention achieves gel recycling through a second temperature simulation device and a semiconductor cooler. After gel damage assessment, the second temperature simulation device heats it to 60°C to liquefy it, re-injects it into the gel cartridge, and then uses the semiconductor cooler to cool it down to 30°C to solidify it, making it usable again. This innovative design not only reduces experimental costs but also avoids the time wasted by frequent gel replacements, making the experimental process more efficient. The repeated testing of fabrics and the recycling of gels work together to optimize the entire experimental process. When continuously impact testing fabrics, the fabric test area can be quickly changed after each impact, while simultaneously assessing and recycling the gel. The synergistic work of both reduces experimental preparation time and material consumption, enabling efficient and continuous experiments and comprehensively improving the overall experimental effectiveness. This provides a more efficient and economical testing scheme for the study of fabric impact resistance. Attached Figure Description

[0051] Figure 1 This is a schematic diagram of the overall structure of an experimental testing device for determining the impact resistance of fabrics according to the present invention.

[0052] Figure 2 For the present invention Figure 1 A structural diagram from another perspective;

[0053] Figure 3 For the present invention Figure 2 A schematic diagram of the cross-sectional structure;

[0054] Figure 4 For the present invention Figure 3 A magnified schematic diagram of the local structure at point A;

[0055] Figure 5 For the present invention Figure 3 A magnified view of the structure at point B in the middle;

[0056] Figure 6 This is a schematic diagram of the rotating ring and indexing motor of the present invention;

[0057] Figure 7 This is a schematic diagram of the calibration tube and gel tube of the present invention;

[0058] Figure 8 This is a schematic diagram of the structure of the fabric to be tested and the guide roller in this invention;

[0059] Figure 9 This is a schematic diagram of the structure of the guide tube and the launching tube of the present invention.

[0060] The attached diagram lists the components represented by each number as follows:

[0061] 1. Support; 2. Projectile; 3. Fabric to be tested; 4. Linear transmission module; 5. Launch tube; 6. Electromagnetic suction platform; 7. Launch base; 8. Spring; 9. Guide tube; 10. Ejector pin; 11. Winding roller; 12. Guide roller; 13. Traction wire; 14. Conical cover; 15. Speed ​​sensor; 16. PLC controller; 17. Fabric rack; 18. First electric actuator; 19. Tension adjustment frame; 20. Pressure probe; 21. Winding roller; 22. Guide roller; 23. Winding motor; 24. 25. Visual sensor; 26. First temperature simulation device; 27. Pump tank; 28. Atomizing nozzle; 29. ​​Slide; 20. Second electric actuator; 30. Sealing shell; 31. Through pipe; 32. Rotating ring; 33. Rotating frame; 34. Indexing motor; 35. Gel tube; 36. Second temperature simulation device; 37. Semiconductor cooler; 38. Calibration cylinder; 39. Pressure sensor array module; 40. High-speed camera; 41. Transmission bevel gear ring; 42. Servo motor; 43. Acquisition notch. Detailed Implementation

[0062] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0063] The present invention provides the following preferred embodiments.

[0064] An experimental test method for determining the impact resistance of fabrics includes the following steps:

[0065] S1: Initial calibration. The fabric to be tested 3 is installed on the fabric rack 17. The tension of the fabric to be tested 3 is adjusted to the set value by the first electric push rod 18. The electromagnetic suction table 6 is activated to compress the spring 8 to the energy storage state. The unloaded projectile 2 impacts the pressure sensor array module 39. This is repeated 3 times to obtain the impact force calibration value and simultaneously calibrate the speed sensor 15.

[0066] S2: Test position switching, liquid agar gel is injected into the transparent gel tube 35, and cooled to 30°C by the semiconductor cooler 37 to solidify it. The servo motor 42 is driven to rotate the solidified gel tube 35 to the test position coaxial with the emitter tube 5.

[0067] S3: Impact data acquisition, release the projectile 2 to impact the surface of the fabric 3 under test, and simultaneously trigger the high-speed camera 40 to record the fabric deformation. Use the image difference between the two visual sensors 24 to detect the fabric damage state.

[0068] S4: Recovery and impact test. Start the winding wheel 11 and motor to tighten the traction wire 13. Guided by the rounded corner of the conical cover 14, pull the projectile 2 back to the initial position of the launching tube 5. Control the winding motor 23 to drive the fabric to move 10CM. Repeat step S3 to continuously test the non-impacted area. Accumulate 3 to 5 impacts. During the impact test, the temperature and humidity of the fabric 3 under test can be set by the first temperature simulation device 25 and the atomizing nozzle 27.

[0069] S5: Damage assessment and cyclic recovery. After each impact, the area of ​​the gel crack is analyzed by a high-speed camera 40. If it exceeds 5 mm², the gel tube 35 is replaced. The damaged gel is heated to 60°C by the second temperature simulation device 36 to liquefy it. It is then re-injected into the gel tube 35 and cooled to 30°C for reuse.

[0070] like Figure 1-9 As shown, an experimental testing device for determining the impact resistance of fabrics includes a support 1, and further includes:

[0071] Bullet 2 has a streamlined shape and is made of nylon.

[0072] The spring system allows for adjustable speed of the projectile 2 by changing the tension of the spring 8.

[0073] Recovery system for the automatic recovery of projectile 2;

[0074] The fabric release system is used for repeatedly releasing the fabric 3 to be tested and adjusting the tension, temperature and humidity of the fabric 3 to be tested.

[0075] The gel system, using agar gel as a backing, is used to test the impact force of projectile 2, measure the penetration of projectile 2, and enable the reuse of agar gel.

[0076] The spring system includes a linear drive module 4 and a launching tube 5 mounted on a bracket 1. An electromagnetic suction platform 6 is driven and mounted on the linear drive module 4. A launching seat 7 is slidably mounted on the inner wall of the launching tube 5. The launching seat 7 contains a permanent magnet that cooperates with the electromagnetic suction platform 6. A spring 8 that is limited by the launching tube 5 is mounted on the back of the launching seat 7. A guide tube 9 is connected to the end of the launching tube 5. The projectile 2 is slidably mounted in the guide tube 9. A pin 10 that cooperates with the projectile 2 is fixedly mounted on the launching seat 7.

[0077] During the energy storage phase of the projectile launch, the linear transmission module 4 drives the electromagnetic suction platform 6 to move. The electromagnetic suction platform 6 attracts the permanent magnet inside the launch base 7, and the compressed spring 8 stores elastic potential energy. When the electromagnetic suction platform 6 loses power and loses its magnetic attraction, the spring 8 rebounds and pushes the launch base 7 forward. The ejector pin 10 on the launch base 7 pushes the projectile 2 out of the guide tube 9. This structure changes the tension of the spring 8 by controlling the position of the electromagnetic suction platform 6, thereby achieving precise adjustment of the projectile 2 launch speed. This solves the problem of the projectile 2 speed being difficult to control precisely in traditional testing devices. It enables the simulation of impact conditions at different speeds when testing the impact resistance of fabrics, improving the accuracy and comprehensiveness of the test results and providing strong support for studying the performance of fabrics under different impact speeds.

[0078] The linear transmission module 4 includes a transmission motor and a transmission screw driven by the transmission motor. The transmission motor has a built-in encoder, which precisely controls the retraction stroke of the projectile and thus precisely controls the energy storage intensity of the projectile.

[0079] The recovery system includes a reel 11 and a guide wheel 12 rotatably connected to the launch tube 5. A motor is mounted on the launch tube 5, and the output shaft of the motor is fixedly connected to the reel 11, on which a traction wire 13 is wound. The guide wheel 12 is in contact with the traction wire 13, and the other end of the traction wire 13 is fixedly connected to the projectile 2. A wire hole is fixedly opened at the tail of the launch tube 5 for the traction wire 13 to pass through. A conical cover 14 is connected to the end of the launch tube 5. The connection between the conical cover 14 and the launch tube 5 and the outer edge of the tail of the projectile 2 are rounded. A speed sensor 15 is mounted on the conical cover 14. The data terminal of the speed sensor 15 is electrically connected to the PLC controller 16. The test axis of the speed sensor 15 is perpendicular to the axis of the launch tube 5.

[0080] Before the projectile 2 is charged, the traction wire 13 is fully released, allowing the projectile 2 to move freely;

[0081] After the projectile 2 is launched, the winding wheel 11 and the motor are activated. The winding wheel 11 rotates under the drive of the motor, tightening the traction wire 13. Since one end of the traction wire 13 is fixed to the projectile 2 and guided by the guide wheel 12, it can stably pull the projectile 2 back. The conical cover 14 at the end of the launching tube 5 and the rounded corner design of the tail of the projectile 2 effectively reduce the resistance during the traction process, making the recovery process smoother. The speed sensor 15 is installed on the conical cover 14, perpendicular to the axis of the launching tube 5, and can accurately measure the launching speed of the projectile 2 and transmit the data to the PLC controller 16. This system solves the problems of the projectile 2 being difficult to recover after launch and the inability to accurately obtain the launching speed, realizes the automatic recovery of the projectile 2, improves the experimental efficiency, and provides accurate speed data for analyzing the energy of the projectile 2 when impacting the fabric, improving the reliability of the experimental data. Furthermore, through the realization of the projectile 2 recovery function, continuous impact testing of the fabric 3 under test and repeated replacement testing of the fabric 3 under test can be quickly realized, thereby effectively improving the automation level of this device.

[0082] The fabric release system includes a fabric to be tested 3 and a fabric rack 17 slidably connected to a support 1. A set of first electric push rods 18 are installed between the fabric rack 17 and the support 1. A tension adjustment frame 19 is slidably installed on the fabric rack 17. A set of pressure probes 20 are installed between the fabric rack 17 and the tension adjustment frame 19. A roller 21 is rotatably installed on both the fabric rack 17 and the tension adjustment frame 19. A winding motor 23 is installed on the side of both the fabric rack 17 and the tension adjustment frame 19. The output shaft ends of the two winding motors 23 are fixedly connected to the two rollers 21 respectively. The two ends of the fabric to be tested 3 are fixedly installed on the two rollers 21 respectively. Two guide rollers 22 are rotatably installed on the inner wall of the fabric rack 17. Both guide rollers 22 are in contact with the fabric to be tested 3. Two vision sensors 24 are installed on the fabric rack 17 facing the fabric to be tested 3. The two vision sensors 24 are respectively set on the upper and lower sides of the guide tube 9.

[0083] The first electric push rod 18 installed between the fabric racks 17 can adjust the distance between the fabric racks 17 and the launching tube 5, thereby adjusting the impact force of the projectile 2 on the fabric 3 to be tested.

[0084] By driving the two winding motors 23 respectively, the tension of the fabric 3 to be tested between the two winding rollers 21 can be adjusted. The pressure probe 20 monitors the tension in real time to ensure that the tension is stable at the set value.

[0085] By adjusting the tension, the stretch and tension of the fabric 3 to be tested can be preset and the actual use conditions can be simulated. By adjusting the tension, test errors caused by the fabric being too loose or too tight can be avoided, and the comparability of data can be improved.

[0086] The winding motors 23 on the fabric rack 17 and the tension adjustment rack 19 drive the winding rollers 21 to rotate, thereby realizing the winding and unwinding of the fabric 3 to be tested, which facilitates the replacement of the test area.

[0087] By enabling the test area replacement function of the fabric under test 3, it is possible to continuously and automatically repeat the test area, thereby obtaining multiple sets of experimental data and improving the test accuracy of the fabric under test 3.

[0088] Guide roller 22 ensures that the fabric remains stable during movement, and vision sensors 24 are located on the upper and lower sides of guide tube 9 respectively, which can monitor the surface condition of the fabric in real time.

[0089] By detecting the image difference between the two vision sensors 24, the damage condition and degree of damage to the fabric 3 under impact can be monitored.

[0090] It also includes a first temperature simulation device 25 and a pump tank 26 mounted on the bracket 1. An atomizing pump is mounted on the pump tank 26, and an atomizing nozzle 27 is mounted on the fabric rack 17. The atomizing nozzle 27 is directly opposite the roller 21 on the fabric rack 17, and the mist outlet of the atomizing pump is connected to the atomizing nozzle 27 through a hose.

[0091] The first temperature simulation device 25 can adjust the ambient temperature according to experimental requirements. The liquid in the pump tank 26 is sprayed into a mist through the atomizing nozzle 27 onto the roller 21 on the fabric rack 17 under the action of the atomizing pump, thereby adjusting the humidity of the fabric 3 to be tested. During the impact test, it can create different temperature and humidity environments for the fabric 3 to be tested, solving the problem that traditional tests ignore the influence of ambient temperature and humidity on the impact resistance of fabrics. This makes the test results more in line with actual use scenarios, improves the practicality and accuracy of the experiment, and helps to study the change law of the impact resistance of fabrics under different temperature and humidity conditions.

[0092] The gel system includes a slide 28 slidably connected to a support 1. A set of second electric actuators 29 are installed between the slide 28 and the fabric frame 17. A sealing shell 30 is installed on the slide 28. A through pipe 31 is connected to the sealing shell 30 and is positioned opposite the emission tube 5. A rotating ring 32 and a rotating frame 33 are rotatably mounted on the inner wall of the sealing shell 30. A rotary motor 34 is mounted on the sealing shell 30. The output shaft end of the rotary motor 34 is fixedly connected to the rotating frame 33. Two gel cylinders 35 are rotatably connected to the inner wall of the rotating ring 32. The tail ends of both gel cylinders 35 are rotatably connected to the rotating frame 33. The internal components of each device store agar gel. A second temperature simulation device 36 and a semiconductor cooler 37 are respectively installed on the sealed shell 30 and above the gel cylinder 35. The sealed shell 30 is equipped with a drive module to drive the gel cylinder 35 to rotate. The inner wall of the rotating ring 32 is fixedly connected to two symmetrically arranged calibration cylinders 38. Pressure sensor array modules 39 are fixedly installed on the inner walls of the two calibration cylinders 38. Two high-speed cameras 40 are symmetrically installed on the sealed shell 30. The data terminals of the pressure sensor array module 39 and the high-speed cameras 40 are both connected to the PLC controller 16.

[0093] The second electric actuator 29 between the slide 28 and the fabric frame 17 can adjust the relative position of the sealing shell 30 and the launching tube 5. After liquid agar gel is injected into the gel cylinder 35, the semiconductor cooler 37 cools and solidifies it. After solidification, the gel cylinder 35 is rotated to the test position under the drive of the servo motor 42. After the projectile 2 impacts the fabric, it acts on the gel. The high-speed camera 40 records the gel state from the direction perpendicular to the axis of the gel cylinder 35, which is used to analyze the penetration of the projectile 2.

[0094] Before the projectile 2 impacts the gel, the pressure sensor array module 39 faces the launching tube 5. The projectile 2 launched by the launching tube 5 acts on the pressure sensor array module 39. The impact force calibration value of the projectile 2 under the specified compression degree of the spring 8 is obtained by repeating 3 times.

[0095] When the gel needs to be replaced after damage assessment, the second temperature simulation device 36 heats the gel to liquefy it. After the gel is completely liquefied, the second temperature simulation device 36 then controls the temperature of the gel to re-solidify it, thereby achieving reuse. This system solves the problems of not being able to accurately measure the impact force and penetration of the projectile 2 and the inability to reuse the gel. It not only reduces the experimental cost, but also obtains more comprehensive data on the impact of the projectile 2 on the fabric, thus enhancing the research value of the experiment.

[0096] A transmission bevel gear ring 41 is rotatably mounted on the rotating frame 33, and a driven bevel gear is installed on the gel cylinder 35. The transmission bevel gear ring 41 is connected to the driven bevel gear. A servo motor 42 is installed on the slide 28, and the output shaft end of the servo motor 42 is fixedly connected to the transmission bevel gear ring 41.

[0097] After the servo motor 42 is started, it drives the transmission bevel gear ring 41 to rotate. The transmission bevel gear ring 41 meshes with the driven bevel gear on the gel cylinder 35, thereby driving the gel cylinder 35 to rotate. During the experiment, different gel cylinders 35 can be quickly switched to the test position in this way, which improves the experimental efficiency, solves the problem of inconvenient switching of gel cylinders 35, reduces the experimental preparation time, makes the experimental process smoother, and helps to improve the overall experimental efficiency.

[0098] The axis of the high-speed camera 40 is perpendicular to the axis of the gel tube 35. A set of acquisition notches 43 are provided on the rotating ring 32. The gel tube 35 is made of transparent glass.

[0099] The axis of the high-speed camera 40 is perpendicular to the axis of the gel tube 35, which can clearly capture the state of the gel after the projectile 2 impacts it, avoiding visual errors caused by the shooting angle. The acquisition notch 43 on the rotating ring 32 provides the high-speed camera 40 with a better shooting field of view, ensuring the integrity of the captured image. The transparent glass gel tube 35 allows the high-speed camera 40 to clearly observe the changes inside the gel, such as crack propagation and the penetration path of the projectile 2, which solves the problem of unclear images of the inside of the gel. This provides clear image data for accurately assessing the degree of damage and penetration of the gel by the projectile 2, and helps to analyze the energy transfer and material damage mechanism after the projectile 2 impacts the fabric more deeply.

[0100] The high-speed camera 40 has a frame rate of 1000fps and a resolution of no less than 1920×1080.

[0101] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An experimental test apparatus for determining the impact resistance of a fabric, characterized in that, Including support (1), still including: Bullet (2), shape is streamlined; Spring system, the adjustable speed of bullet (2) is realized by changing the extension amount of spring (8); Recycling system for automatic recycling of launching bullet (2); Fabric release system for repeatedly replacing and releasing the fabric (3) to be tested and adjusting the tension and temperature and humidity of the fabric (3) to be tested; Gel system, using agar gel as backing, for testing the impact force of bullet (2), measuring the penetration of bullet (2) and realizing the repeated use of agar gel; The gel system includes a sliding carriage (28) slidingly connected to the support (1), a set of second electric push rods (29) installed between the sliding carriage (28) and the fabric rack (17), a sealed shell (30) installed on the sliding carriage (28), a through pipe (31) communicating with the sealed shell (30) and arranged opposite to the launching tube (5), a rotating ring (32) and a rotating frame (33) rotatably installed on the inner wall of the sealed shell (30), a shift motor (34) installed on the sealed shell (30), the output shaft end of the shift motor (34) fixedly connected with the rotating frame (33), two gel cylinders (35) rotatably communicated with the inner wall of the rotating ring (32), the tail ends of the two gel cylinders (35) rotatably connected with the rotating frame (33), and agar gel stored in the interiors of the two gel cylinders (35). The second temperature simulation device (36) and the semiconductor refrigerator (37) are respectively installed on the sealed shell (30) and correspond to the positions above the gel cylinders (35), the sealed shell (30) is provided with a driving module for driving the gel cylinders (35) to rotate, the inner wall of the rotating ring (32) is fixedly communicated with two symmetrically arranged calibration cylinders (38), the inner walls of the two calibration cylinders (38) are both fixedly installed with a pressure sensor array module (39), and the sealed shell (30) is symmetrically installed with two high-speed cameras (40). The data end of the pressure sensor array module (39) and the data end of the high-speed camera (40) are both in data connection with the PLC controller (16).

2. A test apparatus for determining the impact resistance of a fabric according to claim 1, wherein, The spring system includes a linear transmission module (4) and a launching tube (5) installed on the support (1), the electromagnetic suction table (6) is drivingly installed on the linear transmission module (4), the launching seat (7) is slidingly installed on the inner wall of the launching tube (5), the launching seat (7) is built-in with a permanent magnet matched with the electromagnetic suction table (6), the spring (8) is installed on the back surface of the launching seat (7) and limited by the launching tube (5), the end portion of the launching tube (5) is communicated with the guide pipe (9), the bullet (2) is slidingly installed in the guide pipe (9), and the ejector pin (10) matched with the bullet (2) is fixedly arranged on the launching seat (7).

3. An experimental test apparatus for determining the impact resistance of a fabric according to claim 2, wherein, The recovery system includes a reel (11) and a guide wheel (12) rotatably connected to the launch tube (5). A motor is installed on the launch tube (5). The output shaft of the motor is fixedly connected to the reel (11), and a traction wire (13) is wound on the reel (11). The guide wheel (12) is in contact with the traction wire (13). The other end of the traction wire (13) is fixedly connected to the projectile (2). A wire hole is fixedly opened at the tail of the launch tube (5) for the traction wire (13) to pass through. The end of the launching tube (5) is connected to a conical cover (14). The connection between the conical cover (14) and the launching tube (5) and the outer edge of the tail of the projectile (2) are provided with rounded corners. A speed sensor (15) is installed on the conical cover (14). The data terminal of the speed sensor (15) is electrically connected to the PLC controller (16). The test axis of the speed sensor (15) is perpendicular to the axis of the launching tube (5).

4. An experimental test apparatus for determining the impact resistance of a fabric as defined in claim 3, wherein, The fabric release system includes a fabric to be tested (3) and a fabric rack (17) slidably connected to a support (1). A set of first electric push rods (18) is installed between the fabric rack (17) and the support (1). A tension adjustment frame (19) is slidably installed on the fabric rack (17). A set of pressure probes (20) is installed between the fabric rack (17) and the tension adjustment frame (19). A roller (21) is rotatably installed on both the fabric rack (17) and the tension adjustment frame (19). A winding motor (23) is installed on the side of both the fabric rack (17) and the tension adjustment frame (19). The output shaft ends of the two winding motors (23) are fixedly connected to the two rollers (21) respectively. The two ends of the fabric to be tested (3) are fixedly installed on the two rollers (21) respectively. Two guide rollers (22) are rotatably installed on the inner wall of the fabric rack (17). Both guide rollers (22) are in contact with the fabric to be tested (3). Two vision sensors (24) are installed on the fabric rack (17) facing the fabric (3) to be tested. The two vision sensors (24) are respectively located on the upper and lower sides of the guide tube (9).

5. An experimental test apparatus for determining the impact resistance of a fabric as defined in claim 4, wherein, It also includes a first temperature simulation device (25) and a pump tank (26) mounted on the bracket (1), the pump tank (26) is equipped with an atomizing pump, the fabric rack (17) is equipped with an atomizing nozzle (27), the atomizing nozzle (27) is directly opposite the roller (21) on the fabric rack (17), and the mist outlet of the atomizing pump is connected to the atomizing nozzle (27) through a hose.

6. An experimental test apparatus for determining the impact resistance of a fabric as defined in claim 5, wherein, A transmission bevel gear ring (41) is rotatably mounted on the rotating frame (33), a driven bevel gear is installed on the gel tube (35), the transmission bevel gear ring (41) is connected to the driven bevel gear, a servo motor (42) is installed on the slide (28), and the output shaft end of the servo motor (42) is fixedly connected to the transmission bevel gear ring (41).

7. An experimental test apparatus for determining the impact resistance of a fabric as defined in claim 6, wherein, The axis of the high-speed camera (40) is perpendicular to the axis of the gel tube (35), and a set of acquisition notches (43) are provided on the rotating ring (32). The gel tube (35) is made of transparent glass.

8. A method for testing the impact resistance of a fabric, based on the experimental test device for testing the impact resistance of a fabric according to any one of claims 5-7, characterized in that, Includes the following steps: S1: Initial calibration. The fabric to be tested (3) is installed on the fabric rack (17). The tension of the fabric to be tested (3) is adjusted to the set value by the first electric push rod (18). The electromagnetic suction table (6) is started to compress the spring (8) to the energy storage state. The projectile (2) is launched without load to impact the pressure sensor array module (39). This is repeated 3 times to obtain the impact force calibration value and to simultaneously calibrate the speed sensor (15). S2: Test position switching, inject liquid agar gel into the transparent gel tube (35), cool it to 30°C through the semiconductor cooler (37) to solidify it, drive the servo motor (42) to rotate the solidified gel tube (35) to the test position coaxial with the transmitter tube (5); S3: Impact data acquisition, release the projectile (2) to impact the surface of the fabric (3) under test, and simultaneously trigger the high-speed camera (40) to record the fabric deformation. Use the image difference of the two vision sensors (24) to detect the fabric damage status. S4: Recovery and impact test, start the winding wheel (11) and motor to tighten the traction wire (13), and pull the projectile (2) back to the initial position of the launching tube (5) through the rounded corner guide of the conical cover (14). Control the winding motor (23) to drive the fabric to move 10CM. Repeat step S3 to continuously test the non-impacted area, and complete 3 to 5 impacts in total. During the impact test, the temperature and humidity of the fabric (3) to be tested can be set by the first temperature simulation device (25) and the atomizing nozzle (27). S5: Damage assessment and cyclic recovery. After each impact, the area of ​​the gel crack is analyzed by a high-speed camera (40). If it exceeds 5 mm², the gel tube (35) is replaced. The second temperature simulation device (36) is activated to heat the damaged gel to 60°C to liquefy it. The gel is then re-injected into the gel tube (35) and cooled to 30°C for reuse.

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