Film mechanics performance testing device and testing method thereof

Abstract

This invention relates to the field of protective film production testing instruments, specifically providing a film mechanical property testing device and its testing method. The device includes a stretching mechanism comprising a base, an electric stretching roller shaft, and a fixing assembly. The electric stretching roller shaft has a fixing groove. A torque adjustment mechanism is fixed to the base and applies resistance to the electric stretching roller shaft. The fixing mechanism includes a fixing seat and a pressure plate detachably mounted on the surface of the fixing seat via a fixing knob. A puncture mechanism includes a puncture frame and a puncture needle. A circular puncture hole is provided through the center of the pressure plate and the fixing seat. The puncture frame is fixed to the edge of the puncture hole, and the puncture needle is slidably mounted on the puncture frame. By adjusting the tension of the stretching mechanism using the torque adjustment mechanism, different magnitudes of tension can be applied to the film. The elongation of different films under a fixed tension can be measured, and the ultimate tensile strength of different films can be tested.

Description

Technical Field

[0001] This invention relates to the field of protective film production and testing instruments, and in particular to a thin film mechanical property testing device and testing method. Background Technology

[0002] Paint protection film, also known as "invisible car wrap," is a transparent protective film applied to the paint surface of a car to protect the original paint from damage. This product is highly resilient and self-healing, effectively preventing scratches and impacts from sand particles. It also isolates the paint from air, protecting it from damage caused by acid rain, tar, bird droppings, and other pollutants. Furthermore, the high-definition, high-gloss paint protection film enhances and protects the color and shine of the car's paint. To ensure the paint protection film achieves these functions, its tensile and puncture resistance properties must be tested during production to ensure it meets performance standards. However, current technology makes it difficult to perform multiple tests using the same equipment for tensile testing. Changing testing equipment can easily damage the film, and testing different samples makes it difficult to accurately determine the various properties of the same sample. Summary of the Invention

[0003] To address the problem that it is difficult to perform multiple testing functions using the same equipment without changing the film during thin film testing, this invention provides a thin film mechanical property testing device and its testing method. The technical solution adopted by this invention to solve its technical problem is: a film mechanical property testing device and its testing method, including a stretching mechanism, a torque adjustment mechanism, a fixing mechanism, and a puncture mechanism. The stretching mechanism includes a base, an electric stretching roller shaft, and a fixing component. Both ends of the electric stretching roller shaft are rotatably mounted on the base. A fixing groove is formed on the electric stretching roller shaft. The fixing component is used to press one end of the film into the fixing groove. The torque adjustment mechanism is fixed on the base and connected to the axis of the electric stretching roller shaft. The torque adjustment mechanism is used to apply resistance to the electric stretching roller shaft. The fixing mechanism includes a fixing seat, a pressure plate, and a fixing knob. The pressure plate and the fixing seat can clamp the film from the upper and lower sides of the film. The pressure plate is detachably mounted on the surface of the fixing seat through the fixing knob. The puncture mechanism includes a puncture frame and a puncture needle. A circular puncture hole is provided through the center of the pressure plate and the fixing seat. The puncture frame is fixed to the edge of the puncture hole. The puncture needle is slidably mounted on the puncture frame and aligned with the center of the puncture hole. Preferably, the fixing assembly includes a V-shaped clamping plate, a locking frame, a slider, and a locking screw. The V-shaped clamping plate can press the film into the fixing groove and engage with the fixing groove. The locking frame is installed at both ends of the fixing groove. The slider is slidably installed in the locking frame. The middle part of the slider is fixedly connected to the end of the V-shaped clamping plate. The side of the locking frame has a strip-shaped groove for accommodating the locking screw. One end of the locking screw passes through the strip-shaped groove and is threadedly connected to the slider. Tightening the locking screw can lock the slider.

[0004] Preferably, the lower half of the V-shaped card plate is a solid structure, and the upper half of the V-shaped card plate extends upward to form two inclined wing plates, the maximum distance between the two wing plates being greater than the width of the fixing groove.

[0005] Preferably, the torque adjustment mechanism includes a circular resistance plate, an arc-shaped seat, a brake plate, a slide rod, an adjustment knob, and a pressure frame. The center of the circular resistance plate is coaxially and fixedly connected to the axis on one side of the electric stretching roller shaft. The arc-shaped seat is fixed below the circular resistance plate. The slide rod is slidably mounted on the arc-shaped seat. One end of the slide rod is fixedly connected to the brake plate, and the other end of the slide rod is threadedly connected to the adjustment knob. The adjustment knob is rotatably mounted on the pressure frame. The pressure frame is fixed to the outside of the arc-shaped seat. The circular resistance plate and the brake plate are located on the inside of the arc-shaped seat. The brake plate can abut against the circular resistance plate. A buffer pad is also fixed to the side of the brake plate near the circular resistance plate.

[0006] Preferably, a pressure spring is also fitted onto the fixed knob, with the upper end of the pressure spring abutting against the fixed knob and the lower end of the pressure spring abutting against the pressure plate.

[0007] Preferably, the puncture mechanism further includes a handwheel, a length adjusting screw, and a balance slide. The length adjusting screw is vertically disposed on the top of the puncture frame and is threadedly connected to the puncture frame. The handwheel is fixed to the upper end of the length adjusting screw. The two ends of the balance slide are slidably connected to the puncture frame. The lower middle part of the balance slide is fixedly connected to the top of the puncture needle, and the upper middle part of the balance slide is rotatably connected to the bottom of the length adjusting screw. The puncture needle and the length adjusting screw are coaxially arranged. A scale needle is fixed to one end of the balance slide, and a scale ruler that mates with the scale needle is provided on the side of the puncture frame.

[0008] Preferably, the stretching mechanism further includes a worm gear mechanism and a stretching motor, wherein the worm wheel of the worm gear mechanism is fixedly connected to the axis of the electric stretching roller shaft, and the worm of the worm gear mechanism is fixedly connected to the output shaft of the stretching motor.

[0009] The testing method of the film mechanical property testing device includes the aforementioned film mechanical property testing device, and further includes the following steps: S1, first, fully insert one end of the film between the fixed base and the pressure plate and tighten the fixing knob to seal the puncture hole with the film, and press the other end of the film into the fixing groove through the fixing component to make the film flat; S2, adjust the resistance applied by the torque adjustment mechanism to the maximum so that the additional rotational resistance of the electric stretching roller shaft reaches the maximum. Since the rotation of the electric stretching roller shaft is simultaneously subjected to the resistance applied by the film and the torque adjustment mechanism, the tension applied to the film by the electric stretching roller shaft can be minimized. At this time, start the electric stretching roller shaft, and stretch the film by pulling it with the electric stretching roller shaft, and measure the electric stretching... The tensile strength of the film can be obtained by measuring the rotation angle of the stretching roller shaft under minimum tension. S3: Adjust the resistance applied by the torque adjustment mechanism to the minimum so that the additional rotational resistance of the electric stretching roller shaft is minimized. Since the electric stretching roller shaft is subjected to resistance from both the film and the torque adjustment mechanism, the tension applied to the film by the electric stretching roller shaft can be minimized. At this time, start the electric stretching roller shaft and stretch the film until it breaks. The amount of film stretching can be obtained by measuring the rotation angle of the electric stretching roller shaft when the film breaks. S4: First, let the puncture needle fall to the film surface, and then adjust the downward movement distance of the puncture hole multiple times until the film is punctured. This will achieve the puncture resistance test of the film.

[0010] The beneficial effect of this invention is that by setting a torque adjustment mechanism to adjust the tension of the stretching mechanism, the stretching mechanism can apply different magnitudes of tension to the film, which can both measure the elongation of different films under a fixed tension and test the ultimate tensile strength of different films. Attached Figure Description

[0011] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the optimal embodiment of the thin film mechanical property testing device and testing method of the present invention; Figure 2 This is a schematic diagram of the worm gear mechanism of the thin film mechanical property testing device and testing method of the present invention; Figure 3 This is a schematic diagram of the brake plate of the thin film mechanical property testing device and testing method of the present invention; Figure 4This is a schematic diagram of the puncture needle in the thin film mechanical property testing device and testing method of the present invention.

[0013] Reference numerals: 1. Tensioning mechanism; 2. Torque adjustment mechanism; 3. Fixing mechanism; 4. Puncture mechanism; 5. Base; 6. Electric tensioning roller shaft; 7. Fixing groove; 8. Fixing seat; 9. Pressure plate; 10. Fixing knob; 11. Puncture frame; 12. Puncture needle; 13. Puncture hole; 14. V-shaped clamping plate; 15. Locking frame; 16. Slider; 17. Locking screw; 18. Circular resistance plate; 19. Arc-shaped seat; 20. Brake plate; 21. Slide rod; 22. Adjustment knob; 23. Pressure frame; 24. Pressure spring; 25. Handwheel; 26. Length adjustment screw; 27. Balance slide; 28. Scale needle; 29. ​​Worm gear mechanism. Detailed Implementation

[0014] 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.

[0015] The concepts involved in this application will first be described with reference to the accompanying drawings. It should be noted that the following descriptions of various concepts are only for the purpose of making the content of this application easier to understand and do not constitute a limitation on the scope of protection of this application; furthermore, the embodiments and features in the embodiments of this application can be combined with each other unless otherwise specified. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0016] like Figures 1 to 4 As shown, the present invention provides an embodiment of a thin film mechanical property testing device and its testing method, including a stretching mechanism 1, a torque adjustment mechanism 2, a fixing mechanism 3 and a puncture mechanism 4. The stretching mechanism 1 includes a base 5, an electric stretching roller 6 and a fixing component. The two ends of the electric stretching roller 6 are rotatably mounted on the base 5. A fixing groove 7 is provided on the electric stretching roller 6. The fixing component is used to press one end of the film into the fixing groove 7.

[0017] The fixing mechanism 3 includes a fixing base 8, a pressure plate 9, and a fixing knob 10. The pressure plate 9 and the fixing base 8 can clamp the film from the upper and lower sides. The pressure plate 9 can be detachably installed on the surface of the fixing base 8 via the fixing knob 10.

[0018] The fixing assembly includes a V-shaped clamping plate 14, a locking frame 15, a slider 16, and a locking screw 17. The V-shaped clamping plate 14 can press the film into the fixing groove 7 and engage with the fixing groove 7. The locking frame 15 is installed at both ends of the fixing groove 7. The slider 16 is slidably installed in the locking frame 15. The middle part of the slider 16 is fixedly connected to the end of the V-shaped clamping plate 14. The side of the locking frame 15 has a strip-shaped groove for accommodating the locking screw 17. One end of the locking screw 17 passes through the strip-shaped groove and is threadedly connected to the slider 16. Tightening the locking screw 17 can lock the slider 16.

[0019] A pressure spring 24 is also fitted on the fixed knob 10. The upper end of the pressure spring 24 abuts against the fixed knob 10, and the lower end of the pressure spring 24 abuts against the pressure plate 9. Tightening the fixed knob 10 compresses the pressure spring 24, and the pressure spring 24 provides pressure to the pressure plate 9, which can effectively prevent the fixed knob 10 from loosening and failing.

[0020] The lower half of the V-shaped clamp 14 is a solid structure, and the upper half of the V-shaped clamp 14 extends upward with two inclined wing plates. The maximum distance between the two wing plates is greater than the width of the fixing groove 7. When the wing plates of the V-shaped clamp 14 enter the fixing groove 7, the wing plates will deform and fit into the shape of the side wall of the fixing groove 7, thereby increasing the contact surface between the wing plates and the film and the fixing groove 7, avoiding damage to the film due to excessive local pressure, and improving the stability of the film during the measurement process.

[0021] The torque adjustment mechanism 2 is fixed on the base 5 and connected to the axis of the electric stretching roller 6. The torque adjustment mechanism 2 is used to apply resistance to the electric stretching roller 6.

[0022] The torque adjustment mechanism 2 includes a circular resistance plate 18, an arc-shaped seat 19, a brake plate 20, a slide rod 21, an adjustment knob 22, and a pressure frame 23. The center of the circular resistance plate 18 is coaxially and fixedly connected to the axis on one side of the electric stretching roller shaft 6. The arc-shaped seat 19 is fixed below the circular resistance plate 18. The slide rod 21 is slidably mounted on the arc-shaped seat 19. One end of the slide rod 21 is fixedly connected to the brake plate 20, and the other end of the slide rod 21 is threadedly connected to the adjustment knob 22. The adjustment knob 22 is rotatably mounted on the pressure frame 23. The pressure frame 23 is fixed on the outside of the arc-shaped seat 19. The circular resistance plate 18 and the brake plate 20 are located on the inside of the arc-shaped seat 19. The brake plate 20 can abut against the circular resistance plate 18. A buffer pad is also fixed on the side of the brake plate 20 near the circular resistance plate 18.

[0023] When the adjustment knob 22 is tightened, the brake plate 20 can be moved towards the circular resistance plate 18. The buffer pad itself is elastic. The greater the resistance, the greater the compression of the buffer pad. The smaller the resistance, the smaller the compression of the buffer pad. Thus, the brake plate 20 can always maintain contact with the circular resistance plate 18 through the buffer pad, providing resistance to the electric stretching roller shaft 6. When the adjustment knob 22 is fully tightened, the buffer pad can no longer be compressed. At this time, the resistance provided by the torque adjustment mechanism 2 reaches the maximum state. When the adjustment knob 22 is fully loosened, the buffer pad is completely disengaged from the circular resistance plate 18. At this time, the resistance provided by the torque adjustment mechanism 2 reaches the minimum state.

[0024] The puncture mechanism 4 includes a puncture frame 11 and a puncture needle 12. A circular puncture hole 13 is provided through the center of the pressure plate 9 and the fixing seat 8. The puncture frame 11 is fixed to the edge of the puncture hole 13, and the puncture needle 12 is slidably mounted on the puncture frame 11 and aligned with the center of the puncture hole 13. The puncture mechanism 4 also includes a handwheel 25, a length adjusting screw 26, and a balance slide 27. The length adjusting screw 26 is vertically mounted on the top of the puncture frame 11 and is threadedly connected to the puncture frame 11. The handwheel 25 is fixed to the upper end of the length adjusting screw 26. The two ends of the balance slide 27 are slidably connected to the puncture frame 11. The lower middle part of the balance slide 27 is fixedly connected to the top of the puncture needle 12, and the upper middle part of the balance slide 27 is rotatably connected to the bottom of the length adjusting screw 26. The puncture needle 12 and the length adjusting screw 26 are arranged coaxially. A scale needle 28 is also fixed to one end of the balance slide 27. A scale ruler that cooperates with the scale needle 28 is provided on the side of the puncture frame 11. The downward movement of the puncture needle 12 can be precisely adjusted by the scale needle 28 and the scale ruler to facilitate the recording of the puncture length by the staff.

[0025] The stretching mechanism 1 also includes a worm gear mechanism 29 and a stretching motor. The worm wheel of the worm gear mechanism 29 is fixedly connected to the shaft of the electric stretching roller 6, and the worm of the worm gear mechanism is fixedly connected to the output shaft of the stretching motor.

[0026] The testing method for the thin film mechanical property testing device, including the aforementioned thin film mechanical property testing device, further includes the following steps: S1. First, fully insert one end of the film between the fixing base 8 and the pressure plate 9 and tighten the fixing knob 10 to seal the puncture hole 13 with the film. Then, press the other end of the film into the fixing groove 7 through the fixing component and flatten the film.

[0027] S2. Adjust the resistance applied by the torque adjustment mechanism 2 to the maximum so that the additional rotational resistance of the electric stretching roller 6 reaches the maximum. Since the electric stretching roller 6 is subjected to resistance from both the film and the torque adjustment mechanism, the tension applied to the film by the electric stretching roller 6 can be minimized. At this time, start the electric stretching roller 6 and stretch the film by pulling it. The tensile strength of the film can be obtained by measuring the rotation angle of the electric stretching roller 6 under the minimum tension state, thus realizing the measurement of the elongation of different films under a fixed tension.

[0028] S3. Adjust the resistance applied by the torque adjustment mechanism 2 to the minimum, so that the additional rotational resistance of the electric stretching roller 6 is minimized. Since the electric stretching roller 6 is subjected to resistance from both the film and the torque adjustment mechanism, the tension applied to the film by the electric stretching roller 6 can be minimized. At this time, start the electric stretching roller 6 and stretch the film to break through the electric stretching roller 6. The amount of film stretching can be obtained by measuring the rotation angle of the electric stretching roller 6 when the film breaks.

[0029] S4. First, lower the puncture needle 12 to the surface of the membrane, and then adjust the downward distance of the puncture hole 13 multiple times until the membrane is punctured, thus achieving the membrane puncture resistance test. This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. The above are only preferred embodiments of this application. It should be noted that due to the limitations of textual expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this application.

Claims

1. A thin film mechanical property testing device, characterized in that: The device includes a stretching mechanism (1), a torque adjustment mechanism (2), a fixing mechanism (3), and a piercing mechanism (4). The stretching mechanism (1) includes a base (5), an electric stretching roller shaft (6), and a fixing assembly. The two ends of the electric stretching roller shaft (6) are rotatably mounted on the base (5). A fixing groove (7) is provided on the electric stretching roller shaft (6). The fixing assembly is used to press one end of the film into the fixing groove (7). The torque adjustment mechanism (2) is fixed on the base (5) and connected to the axis of the electric stretching roller shaft (6). The torque adjustment mechanism (2) is used to apply resistance to the electric stretching roller shaft (6). The fixing assembly is used to press one end of the film into the fixing groove (7). The mechanism (3) includes a fixed seat (8), a pressure plate (9) and a fixing knob (10). The pressure plate (9) and the fixed seat (8) can clamp the film from the upper and lower sides of the film. The pressure plate (9) is detachably installed on the surface of the fixed seat (8) through the fixing knob (10). The puncture mechanism (4) includes a puncture frame (11) and a puncture needle (12). A circular puncture hole (13) is provided through the center of the pressure plate (9) and the fixed seat (8). The puncture frame (11) is fixed to the edge of the puncture hole (13). The puncture needle (12) is slidably installed on the puncture frame (11) and aligned with the center of the puncture hole (13).

2. The thin film mechanical property testing device as described in claim 1, characterized in that: The fixing assembly includes a V-shaped clamp (14), a locking frame (15), a slider (16), and a locking screw (17). The V-shaped clamp (14) can press the film into the fixing groove (7) and engage with the fixing groove (7). The locking frame (15) is installed at both ends of the fixing groove (7). The slider (16) is slidably installed in the locking frame (15). The middle part of the slider (16) is fixedly connected to the end of the V-shaped clamp (14). The side of the locking frame (15) is provided with a strip groove for accommodating the locking screw (17). One end of the locking screw (17) passes through the strip groove and is threadedly connected to the slider (16). Tightening the locking screw (17) can lock the slider (16).

3. The thin film mechanical property testing device as described in claim 2, characterized in that: The lower half of the V-shaped card plate (14) is a solid structure, and the upper half of the V-shaped card plate (14) extends upward with two inclined wing plates. The maximum distance between the two wing plates is greater than the width of the fixing groove (7).

4. The thin film mechanical property testing device as described in claim 1, characterized in that: The torque adjustment mechanism (2) includes a circular resistance plate (18), an arc-shaped seat (19), a brake plate (20), a slide rod (21), an adjustment knob (22), and a pressure frame (23). The center of the circular resistance plate (18) is coaxially and fixedly connected to the axis on one side of the electric stretching roller shaft (6). The arc-shaped seat (19) is fixed below the circular resistance plate (18). The slide rod (21) is slidably mounted on the arc-shaped seat (19). One end of the slide rod (21) is fixedly connected to the brake plate (20). The other end of the slide rod (21) is threadedly connected to the adjustment knob (22). The adjustment knob (22) is rotatably mounted on the pressure frame (23). The pressure frame (23) is fixed on the outside of the arc-shaped seat (19). The circular resistance plate (18) and the brake plate (20) are located on the inside of the arc-shaped seat (19). The brake plate (20) can abut against the circular resistance plate (18). A buffer pad is also fixed on the side of the brake plate (20) near the circular resistance plate (18).

5. The thin film mechanical property testing device as described in claim 1, characterized in that: A pressure spring (24) is also fitted on the fixed knob (10). The upper end of the pressure spring (24) abuts against the fixed knob (10), and the lower end of the pressure spring (24) abuts against the pressure plate (9).

6. The thin film mechanical property testing device as described in claim 1, characterized in that: The puncture mechanism (4) also includes a handwheel (25), a length adjusting screw (26), and a balance slide (27). The length adjusting screw (26) is vertically arranged at the top of the puncture frame (11). The length adjusting screw (26) is threadedly connected to the puncture frame (11). The handwheel (25) is fixed at the upper end of the length adjusting screw (26). The two ends of the balance slide (27) are slidably connected to the puncture frame (11). The lower part of the middle of the balance slide (27) is fixedly connected to the top of the puncture needle (12). The upper part of the middle of the balance slide (27) is rotatably connected to the bottom of the length adjusting screw (26). The puncture needle (12) and the length adjusting screw (26) are arranged coaxially. A scale needle (28) is also fixed at one end of the balance slide (27). A scale ruler that cooperates with the scale needle (28) is provided on the side of the puncture frame (11).

7. The thin film mechanical property testing device as described in claim 1, characterized in that: The stretching mechanism (1) further includes a worm gear mechanism (29) and a stretching motor. The worm of the worm gear mechanism (29) is fixedly connected to the axis of the electric stretching roller shaft (6), and the worm of the worm gear mechanism is fixedly connected to the output shaft of the stretching motor.

8. A testing method for a thin film mechanical property testing device, characterized in that, The thin film mechanical property testing apparatus as described in any one of claims 1 to 7 further includes the following steps: S1. First, insert one end of the film completely between the fixing seat (8) and the pressure plate (9) and tighten the fixing knob (10) to seal the puncture hole (13) with the film. Then, press the other end of the film into the fixing groove (7) through the fixing component and flatten the film. S2. Adjust the resistance applied by the torque adjustment mechanism (2) to the maximum so that the additional rotational resistance of the electric stretching roller shaft (6) reaches the maximum. Since the electric stretching roller shaft (6) is subjected to the resistance applied by the film and the torque adjustment mechanism at the same time, the tension applied to the film by the electric stretching roller shaft (6) can be minimized. At this time, start the electric stretching roller shaft (6) and stretch the film by pulling it. The tensile strength of the film can be obtained by measuring the rotation angle of the electric stretching roller shaft (6) under the minimum tension state. S3. Adjust the resistance applied by the torque adjustment mechanism (2) to the minimum so that the additional rotational resistance of the electric stretching roller shaft (6) is minimized. Since the electric stretching roller shaft (6) is subjected to the resistance applied by the film and the torque adjustment mechanism at the same time, the tension applied to the film by the electric stretching roller shaft (6) can be minimized. At this time, start the electric stretching roller shaft (6) and stretch the film to break through the electric stretching roller shaft (6). The amount of film stretching can be obtained by measuring the rotation angle of the electric stretching roller shaft (6) when the film breaks. S4. First, let the puncture needle (12) fall to the surface of the film, and then adjust the downward distance of the puncture hole (13) multiple times until the film is punctured, so as to realize the puncture resistance test of the film.

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