An automatic detection device for tensile strength of a protective film and a detection method thereof

Abstract

This invention discloses an automatic detection device and method for the tensile strength of protective films, relating to the field of membrane tensile strength testing technology. It includes a tensile testing machine comprising a rigid frame, a movable crossbeam, and a bidirectional clamp, as well as an air permeability testing mechanism. The air permeability testing mechanism includes an air blowing component and an airflow detection component symmetrically arranged on both sides of the membrane sample, used to simultaneously perform air permeability testing under tensile conditions. This invention addresses the problem in existing technologies where waterproof and breathable membranes simultaneously handle dynamic tensile stress and air permeability requirements in practical applications. Traditional independent testing fails to quantify the correlation between tensile deformation and air permeability, leading to static data overestimating the material's true performance under actual working conditions and increasing the risk of structural failure. This invention offers advantages such as achieving simultaneous dynamic detection of air permeability during the tensile process through integrated design, and quantifying the material performance degradation law under actual working conditions.

Description

Technical Field

[0001] This invention relates to the field of membrane tensile strength testing technology, and in particular to an automatic testing device and method for the tensile strength of protective membranes. Background Technology

[0002] In practical applications of waterproof and breathable membranes, tensile strength testing is a core step in assessing their engineering suitability. These membranes must withstand long-term tensile stresses caused by construction tension, structural deformation, or wind loads in building and underground engineering projects. Insufficient tensile strength can easily lead to tearing or overall deformation failure, directly affecting the sealing and durability of the engineering structure. Simultaneously, breathability testing is crucial to ensuring their functionality. The core value of waterproof and breathable membranes lies in balancing liquid water barrier and gas permeability, and breathability directly affects humidity regulation within buildings, equipment heat dissipation, and the comfort of medical protective equipment. Insufficient breathability can lead to indoor moisture accumulation, structural corrosion, or functional failure.

[0003] In practical engineering applications, waterproof and breathable membranes are inevitably subjected to environmental loads, structural deformation, and installation tension, resulting in continuous dynamic tensile stress. This tensile strain directly alters the microporous structure of the membrane material, thus nonlinearly affecting its breathability. However, traditional testing methods can only independently assess the static breathability or mechanical strength of the membrane material, failing to quantify the dynamic relationship between tension and breathability. For example, existing standards measure breathability under strain-free conditions using differential pressure or constant flow methods, but in actual working conditions, membrane materials are often under the combined effects of tension and fluid pressure. Relying solely on static breathability data will severely overestimate the actual performance of the membrane material under dynamic stress, potentially leading to tearing or leakage failure. Therefore, it is necessary to quantify the changes in breathability under different degrees of tension, simulating actual strain gradients to capture the evolution trend of the microporous structure under stress, and revealing the critical attenuation threshold of breathability performance as tensile strength increases.

[0004] To address the above technical problems, this invention discloses an automatic detection device and method for the tensile strength of protective films. This invention has the advantage that waterproof and breathable films can simultaneously meet the requirements of dynamic tensile stress and breathability in practical applications. In contrast, traditional independent testing methods cannot quantify the dynamic correlation between tensile deformation and breathability, leading to static data overestimating the true performance of materials under actual working conditions, which in turn leads to the risk of structural failure. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an automatic detection device and method for the tensile strength of protective films. This addresses the technical problem that in practical applications, waterproof and breathable films must simultaneously meet the requirements of dynamic tensile stress and breathability. Traditional independent testing methods cannot quantify the dynamic correlation between tensile deformation and breathability, leading to static data overestimating the true performance of the material under actual working conditions and thus causing structural failure risks. This invention has the advantages of achieving synchronous dynamic detection of the breathability of the protective film during the stretching process through integrated design and quantifying the material performance degradation law under actual working conditions.

[0006] This invention is achieved through the following technical solution: This invention discloses an automatic testing device for the tensile strength of a protective film, including a tensile testing machine, which includes a rigid frame, a movable crossbeam and a bidirectional clamp, and also includes an air permeability testing mechanism;

[0007] The air permeability testing mechanism includes an air blowing component and an airflow detection component symmetrically arranged on both sides of the membrane sample, for simultaneously performing air permeability testing under tensile conditions.

[0008] It also includes a lateral movement component that drives the air blowing component and the airflow detection component to move toward and away from each other in order to adjust their gap with the membrane surface.

[0009] Furthermore, the air blowing assembly includes an air pressure generating unit, an array of air nozzles, and a conical airflow confinement hood, wherein the open end of the airflow confinement hood faces the membrane sample to vertically focus the airflow;

[0010] The sensing end of the airflow detection component faces the array-type air nozzle, and the airflow detection component is surrounded by a sealed constraint cavity, which together with the airflow constraint cover forms a closed flow channel.

[0011] Furthermore, the lateral movement component includes a support frame, with mounting plates symmetrically fixed to both sides of the rigid frame. The support frame is fixed to the mounting plates and consists of vertical support poles and a top fixing plate.

[0012] Furthermore, it also includes a transmission mechanism, which is mounted on the substrate bearing surface and drives the lateral displacement of the mounting bases of the air blowing assembly and the airflow detection assembly through a ball screw pair.

[0013] Furthermore, the array of air nozzles is equidistantly distributed along the stretching axis of the membrane material and is connected to the air pressure generating unit through flexible pipelines.

[0014] Furthermore, the airflow detection component includes multiple equidistantly distributed airflow sensors for capturing the penetrating airflow and resolving pressure parameters.

[0015] Furthermore, the transmission mechanism includes a drive motor, a transmission screw, a moving plate, a slide bar, and a mounting base. The drive motor drives the transmission screw via a synchronous pulley set. The moving plate is threadedly connected to the transmission screw through a ball nut pair. The moving plate drives four parallel slide bars to push the mounting base to move, forming a four-column cantilever guide structure.

[0016] Furthermore, it also includes an equidistant adjustment component, integrated into the mounting base, which is driven by a motor to move synchronously, so that the coverage area of ​​the array-type air nozzle and the airflow detection component sensor automatically and linearly expands with the stretching length of the membrane material.

[0017] Furthermore, it also includes a triggering component, which includes a slide rail, a longitudinal sliding seat, and a proximity sensor; the longitudinal sliding seat is linked to the moving crossbeam via a fixed rod, and its displacement causes the proximity sensor to be coplanar with the adjustable sensing block on the slide rail, triggering a signal to control the lateral sliding component to start.

[0018] A method for detecting the tensile strength of a protective film using an automatic testing device includes the following steps:

[0019] Step 1: Clamp the membrane sample in the bidirectional clamping system and set the tensile rate and deformation threshold;

[0020] Step 2: Start the moving crossbeam loading; when the membrane material is stretched, the equidistant adjustment components simultaneously expand the coverage area of ​​the air nozzles and sensors.

[0021] Step 3: When the membrane material reaches the preset deformation, the trigger component sends a signal to pause the stretching, and the transverse component drives the air blowing and airflow detection component to move to the preset gap;

[0022] Step 4: The nozzle injects directional airflow, the sensor records the penetration parameters, the component resets, and the stretching continues;

[0023] Step 5: Output the fracture strength, elongation, and air permeability curves under multiple strain levels when the sample breaks.

[0024] The present invention has the following advantages:

[0025] (1) This invention integrates the air permeability testing mechanism with a standard tensile testing machine to achieve simultaneous quantitative evaluation of the tensile strength and air permeability of waterproof and breathable membranes under simulated actual dynamic stress conditions. The device can automatically pause stretching and trigger non-contact air permeability testing at any preset deformation gradient during the membrane stretching process, capturing the nonlinear influence of microporous structure evolution on air permeability under different stretching degrees. This solves the problem in the prior art that it can only independently test static air permeability or mechanical properties and cannot truly reflect the material performance degradation law under dynamic working conditions.

[0026] (2) The present invention features an automated lateral movement component, an airflow constraint cover, and a triggering component that work together to ensure the accuracy, reliability, and efficiency of the air permeability testing process. The air blowing component and the airflow detection component can automatically move towards each other to a precise gap according to a preset deformation threshold (set by an adjustable sensing block), thereby achieving directional application, vertical penetration, and sealed collection of airflow, improving the accuracy of the test. After the test is completed, the components automatically reset and connect to the subsequent stretching process until breakage. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 For the present invention Figure 1 A magnified schematic diagram of the structure at point A;

[0029] Figure 3 For the present invention Figure 2 A magnified schematic diagram of the structure at point B;

[0030] Figure 4 This is a schematic diagram of the support frame structure of the present invention;

[0031] Figure 5 This is a schematic diagram of the transmission mechanism structure of the present invention;

[0032] Figure 6 This is a schematic diagram of the enlarged structure of the trigger component of the present invention;

[0033] Figure 7 For the present invention Figure 6 A magnified structural diagram of point C.

[0034] In the diagram: 1. Rigid frame; 2. Moving crossbeam; 3. Fixture; 4. Air permeability detection mechanism; 5. Sealed constraint cavity; 6. Lateral movement assembly; 7. Base plate; 8. Connecting rod; 9. Trigger assembly; 10. Sensing block; 11. Mounting plate; 12. Equidistant adjustment assembly; 401. Air blowing assembly; 402. Airflow detection assembly; 411. Air pressure generating unit; 412. Arrayed air nozzles; 413. Airflow constraint cover; 601. Support frame; 602. Transmission mechanism; 611. Supporting upright; 612. Fixing plate; 621. Drive motor; 622. Transmission screw; 623. Moving plate; 624. Slide rod; 625. Mounting base; 901. Slide rail base; 902. Longitudinal moving base; 903. Fixing rod; 904. Proximity sensor. Detailed Implementation

[0035] The embodiments of the present invention are described in detail below. These embodiments are implemented based on the technical solution of the present invention, and provide detailed implementation methods and specific operation processes. However, the scope of protection of the present invention is not limited to the following embodiments. In the description of the present invention, words such as "front", "rear", "left", and "right" that indicate orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0036] An embodiment discloses an automatic detection device for the tensile strength of a protective film, such as... Figures 1-7 As shown, the core of this automatic tensile strength testing device for protective films is a tensile testing machine, whose structure includes a rigid frame 1, a movable crossbeam 2, and a two-way clamping system 3. The clamps 3 are fixed to the bottom of the frame and the movable crossbeam 2 respectively, used to hold the tensile specimen. The drive module drives a planetary reducer via a servo motor, which in turn drives a precision ball screw, achieving stepless longitudinal speed regulation of the movable crossbeam 2. This linkage setting precisely controls the displacement rate of the crossbeam to apply a gradient tensile load to the specimen, ultimately completing the automated testing process of the protective film's tensile strength.

[0037] like Figure 1 As shown, in the tensile strength test of the waterproof and breathable membrane, the two ends of the specimen are first strictly aligned and clamped within the upper and lower clamps 3 to ensure that the force axis is consistent with the tensile direction. Then, the equipment is started, and the moving crossbeam 2 is continuously loaded at a preset rate through uniform displacement control, so that the specimen is subjected to a gradually increasing tensile load. The system monitors the load change in real time, and automatically terminates the test when a sudden drop in force is detected (indicating specimen fracture), and simultaneously outputs key parameters such as fracture strength and corresponding elongation. Finally, the equipment is reset to complete a single test cycle.

[0038] In actual use, waterproof and breathable membranes are inevitably subjected to environmental loads, structural deformation, and installation tension, causing them to continuously bear dynamically changing tensile stress. This tensile strain directly alters the microporous structure of the membrane material, thus nonlinearly affecting its breathability.

[0039] However, existing testing methods can only independently assess the static air permeability or mechanical strength of membrane materials, failing to quantify the dynamic relationship between tension and air permeability. For example, current standards measure air permeability under strain-free conditions using differential pressure or constant flow methods, but in actual operating conditions, membrane materials are often subjected to the combined effects of tension and fluid pressure. Relying solely on static air permeability data would severely overestimate the actual performance of the membrane material under dynamic stress, potentially leading to tearing or leakage failure. Therefore, it is necessary to quantify the changes in air permeability under different degrees of tension, simulating actual strain gradients to capture the evolution trend of the microporous structure under stress, and revealing the critical attenuation threshold of air permeability as tensile strength increases.

[0040] Therefore, as Figures 1-3 As shown, this embodiment integrates a breathability testing mechanism 4, which aims to simultaneously perform breathability testing on the waterproof and breathable membrane under tension, in order to simulate the functional response of the membrane material under dynamic stress in actual working conditions and quantify the correlation mechanism between the degree of tension and breathability.

[0041] like Figures 1-3 As shown, the air permeability testing mechanism 4 consists of an air blowing component 401 and an airflow detection component 402. The air blowing component 401 is located on one side of the rigid frame 1, applying directional airflow to the membrane material. The airflow detection component 402 is located on the opposite side of the frame, monitoring the airflow parameters permeating the membrane material in real time. In practice, the waterproof and breathable membrane sample is clamped and fixed by upper and lower clamps 3. The airflow generated by the air blowing component 401 penetrates the membrane material vertically, and the airflow detection component 402 analyzes the air permeability based on the change in airflow pressure, thereby achieving dynamic evaluation of air permeability under different tensile gradients.

[0042] Specifically, the air blowing assembly 401 includes an air pressure generating unit 411, an array of air nozzles 412, and an airflow constraint cover 413. The air pressure generating unit 411 serves as an independent air supply source and is located on the side of the tensile testing machine. The array of air nozzles 412 are equidistantly distributed along the tensile axis of the waterproof and breathable membrane and are connected to the output port of the air pressure generating unit 411 through a flexible pipeline system to form a directional airflow application setting. The airflow constraint cover 413 covers the outside of the air nozzles and axially constrains the jet airflow through the cavity guide structure to ensure that the airflow penetrates the membrane sample vertically.

[0043] The airflow detection component 402 is based on a sealed sensing module. An airflow sensor is set on the opposite side of the membrane material. The airflow sensor is the same as the array of air nozzles 412. Multiple airflow sensors are also set and distributed equidistantly along the tensile axis of the waterproof and breathable membrane. The sensing end faces the air nozzle array. The real-time air permeability is analyzed by capturing the airflow pressure parameters that penetrate the membrane material. A sealed constraint cavity 5 is integrated around the sensor. This cavity and the air nozzle side constraint cover work together to form a closed flow channel, forcing the penetrating airflow to focus on the sensor's sensitive area, eliminating environmental disturbance interference, and improving the detection signal-to-noise ratio.

[0044] It should be noted that, for example Figures 2-3 As shown, both the airflow constraint shroud 413 and the sealed constraint cavity 5 adopt a conical cavity configuration, with their opening ends designed as large-area open openings oriented towards the membrane sample. This configuration optimizes the airflow distribution through a conical guide structure. When the air nozzle is activated, the conical airflow constraint shroud 413 axially constrains the jet airflow, ensuring that the airflow is vertically focused onto the membrane surface area.

[0045] During testing, the airflow constraint covers 413 on both sides move synchronously along the tensile axis, maintaining a preset gap (non-contact state) between their open ends and the membrane surface. The airflow injected by the nozzle penetrates the membrane under the guidance of the conical airflow constraint cover 413, and the penetrating airflow then enters the constraint cavity of the opposite airflow constraint cover 413. The airflow sensor located in the cavity captures the penetrating airflow based on the annular constraint channel, analyzes the changes in pressure parameters in real time, and finally realizes a continuous quantitative evaluation of the membrane permeability under different tensile gradients.

[0046] Considering that the opening of the airflow constraint cover 413 needs to be close to the membrane material to constrain airflow and prevent diffusion, but an overly close arrangement would interfere with membrane installation and removal and obstruct the observation line of sight, a transverse component 6 is provided in this embodiment. This component performs position control of the air blowing component 401 and the airflow detection component 402 during the tensile test; when the membrane material reaches the preset tensile length, it drives the air blowing component 401 and the airflow detection component 402 to move towards each other, maintaining a precise preset gap between the opening of the conical airflow constraint cover 413 and the membrane surface, ensuring that the airflow vertically focuses and penetrates the membrane material while avoiding physical contact; after the air permeability test is completed, the transverse component 6 immediately drives the two components to move away from the membrane material and reset, thus providing unobstructed operating space for sample replacement and deformation observation.

[0047] It should be noted that, as Figures 1-5 As shown, both the air blowing assembly 401 and the airflow detection assembly 402 are equipped with a transverse component 6, which enables the air blowing assembly 401 and the airflow detection assembly 402 to move towards each other.

[0048] like Figures 1-5 As shown, the lateral movement component 6 includes a support frame 601 and a transmission mechanism 602; lateral mounting plates 11 are symmetrically fixed on both sides of the rigid frame 1; the support frame 601 is welded as a whole to four vertical support rods 611 and a top fixing plate 612, with the bottom end of the support rods 611 rigidly connected to the mounting plate 11 and the top end welded to the fixing plate 612; the base plate 7 is suspended between the fixing plate 612 and the mounting plate by four high-rigidity connecting rods 8; the transmission mechanism 602 is set as a ball screw transmission pair, which is installed on the bearing surface of the base plate 7, and drives the air blowing component 401 and the airflow detection component 402 to perform high-precision lateral displacement through the linear motion conversion of the screw and nut pair.

[0049] More specifically, the transmission mechanism 602 includes a drive motor 621, a transmission screw 622, a moving plate 623, a slide rod 624, and a mounting base 625. The drive motor 621 is fixedly mounted on the bearing surface of the base plate 7, and its output shaft is linked to the transmission screw 622 through a synchronous pulley set. The two ends of the transmission screw 622 are rotatably supported between the base plate 7 and the fixed plate 612 by high-precision bearings. The moving plate 623 engages with the screw through a ball nut pair to realize the conversion between rotation and linear motion. Four parallel slide rods 624 are rigidly connected to the side of the moving plate 623 facing the fixed plate 612. The slide rods 624 extend through the connecting plate to the outside and are fixed to the rectangular mounting base 625 at the end, forming a four-column cantilevered guide structure to ensure that the displacement trajectory is not skewed.

[0050] When performing displacement, the drive motor 621 drives the lead screw to rotate via belt transmission. Through the thread engagement effect of the nut pair, the circumferential motion of the lead screw is converted into the axial translation of the moving plate 623. The moving plate 623 drives the four sliding rods 624 to move synchronously, thereby pushing the mounting base 625 to move precisely along the guide axis. The air blowing component 401 and the airflow detection component 402 are respectively integrated into the corresponding mounting base 625, thereby realizing the coordinated movement of the two components in opposite directions, regulating the gap between the airflow constraint cover 413 and the membrane material, and achieving closed-loop control of non-contact dynamic air permeability detection.

[0051] Furthermore, considering that the sample length dynamically changes during membrane stretching, this solution integrates an equidistant adjustment component 12 on the mounting base 625 to ensure that the array nozzle group always covers the entire length of the stretched membrane. This component performs synchronous displacement via a motor-driven moving part, allowing the coverage area of ​​the array nozzles to automatically and linearly expand with the real-time stretching length of the membrane. Its adjustment principle is based on the linear displacement conversion mechanism of the motor and lead screw, achieving real-time matching between the nozzle spacing and the membrane stretching deformation (this is a mature existing technology, and the specific transmission logic will not be elaborated).

[0052] In order to automatically activate the lateral movement component 6 during the stretching process, so that the air blowing component 401 and the airflow detection component 402 move to the membrane material to perform air permeability detection, in this embodiment, as follows: Figure 1 , Figure 6 and Figure 7 As shown, set trigger component 9;

[0053] Specifically, such as Figure 1 , Figure 6 and Figure 7As shown, the triggering component 9 includes a slide rail seat 901, a longitudinal shift seat 902, a fixing rod 903, and a proximity sensor 904. The slide rail seat 901 is rigidly fixed to the outer wall of the mounting plate 11. The longitudinal shift seat 902 is slidably assembled on the side of the slide rail seat 901 along the tensile axis through a high-precision linear slide rail assembly. The fixing rod 903 is fixedly connected to the top of the longitudinal shift seat 902, and the other end of the rod is rigidly linked to the moving crossbeam 2 of the testing machine. The proximity sensor 904 is embedded in the longitudinal shift seat 902 facing the slide rail seat 901. An adjustable array of sensing blocks 10 is set at the corresponding position of the slide rail seat 901. The spacing between the sensing blocks 10 is infinitely adjustable through the slide rail assembly, forming a tensile displacement and electrical signal conversion interface.

[0054] When the moving crossbeam 2 drives the membrane material to stretch to the target deformation, the longitudinal shift seat 902 moves accordingly, causing the proximity sensor 904 and the preset sensing block 10 to reach the same height, triggering a position signal; the central controller immediately pauses the stretching loading, and synchronously starts the transmission screw 622 motor, driving the air blowing component 401 and the airflow detection component 402 to move towards each other to the preset gap position; the air nozzle sprays airflow to perform air permeability detection, and after completion, the two components reset, and the stretching process continues.

[0055] The adjustable layout of the sensing block 10 and the displacement transmission characteristics of the longitudinal sliding seat 902 work together to realize the mapping of the degree of stretching and the timing of detection. By adjusting the axial position of the sensing block 10 on the slide rail seat 901, the tensile deformation threshold triggered by the air permeability detection can be directly set, thereby dynamically capturing the air permeability evolution law at different stretching stages and providing a customized experimental path for the gradient quantification of material properties.

[0056] A method for automatically detecting the tensile strength of a protective film includes the following steps:

[0057] Step 1: First, perform sample clamping and initialization. Clamp both ends of the waterproof and breathable membrane sample in the upper and lower clamps 3, ensuring that the force axis is aligned, and set the tensile rate.

[0058] Step 2: The moving beam 2 is loaded at a preset rate, the membrane length increases dynamically, and the equidistant adjustment component 12 simultaneously expands the coverage area of ​​the air nozzle and sensor;

[0059] Step 3: Perform a tensile test. When the preset deformation is reached, the proximity sensor 904 moves to the same height as the sensing block 10, triggering component 9 to send a signal. The moving beam 2 stops moving and the tensile test is paused. Then, the transverse component 6 drives the air blowing component 401 and the airflow detection component 402 to move towards each other to the gap position.

[0060] Step 4: The nozzle injects a directional airflow, and the sensor records the penetration pressure and flow rate in real time;

[0061] Step 5: After the test is completed, the air blowing component 401 and the airflow detection component 402 are reset, the moving crossbeam 2 continues to rise, and the stretching continues until the next deformation threshold or the sample breaks.

[0062] Step 6: When the sample breaks, the system automatically records the breaking strength, elongation, and corresponding air permeability.

[0063] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An automatic testing device for the tensile strength of a protective film, comprising a tensile testing machine, wherein the tensile testing machine comprises a rigid frame (1), a movable crossbeam (2), and a bidirectional clamp (3), characterized in that, It also includes a breathability testing institution (4); The air permeability testing mechanism (4) includes an air blowing component (401) and an airflow detection component (402) symmetrically arranged on both sides of the membrane sample, for simultaneously performing air permeability testing under tensile conditions. It also includes a transverse component (6), which drives the air blowing component (401) and the airflow detection component (402) to move towards and away from each other to adjust their gap with the membrane surface; The air blowing assembly (401) includes an air pressure generating unit (411), an array of air nozzles (412), and a conical airflow confinement cover (413), the open end of which faces the membrane sample to vertically focus the airflow. The sensing end of the airflow detection component (402) is directly facing the array-type air nozzle (412). The airflow detection component (402) is surrounded by a sealed constraint cavity (5), which, together with the airflow constraint cover (413), forms a closed flow channel. It also includes an equidistant adjustment component (12), which is integrated into the mounting base (625). The moving part is synchronously displaced by a motor, so that the coverage area of ​​the array-type air nozzle (412) and the airflow detection component (402) sensor automatically and linearly expands with the stretching length of the membrane material. It also includes a triggering component (9), which includes a slide rail (901), a longitudinal shifting seat (902), and a proximity sensor (904); the longitudinal shifting seat (902) is linked to the moving crossbeam (2) through a fixed rod (903), and its displacement causes the proximity sensor (904) to trigger a signal when it is coplanar with the adjustable sensing block (10) on the slide rail (901), thereby controlling the transverse shifting component (6) to start.

2. The automatic detection device for the tensile strength of a protective film as described in claim 1, characterized in that, The transverse component (6) includes a support frame (601), and mounting plates (11) are symmetrically fixed on both sides of the rigid frame (1). The support frame (601) is fixed on the mounting plates (11), and the support frame (601) is composed of a vertical support pole (611) and a top fixing plate (612).

3. The automatic detection device for the tensile strength of a protective film as described in claim 2, characterized in that, It also includes a transmission mechanism (602), which is mounted on the bearing surface of the substrate (7) and drives the lateral displacement of the mounting base (625) of the air blowing assembly (401) and the airflow detection assembly (402) through a ball screw pair.

4. The automatic detection device for the tensile strength of a protective film as described in claim 1, characterized in that, The array of air nozzles (412) are equidistantly distributed along the stretching axis of the membrane material and are connected to the air pressure generating unit (411) through a flexible pipeline.

5. The automatic detection device for the tensile strength of a protective film as described in claim 1, characterized in that, The airflow detection component (402) includes multiple equidistantly distributed airflow sensors for capturing penetrating airflow and resolving pressure parameters.

6. The automatic detection device for the tensile strength of a protective film as described in claim 3, characterized in that, The transmission mechanism (602) includes a drive motor (621), a transmission screw (622), a moving plate (623), a slide bar (624), and a mounting base (625). The drive motor (621) drives the transmission screw (622) via a synchronous pulley set. The moving plate (623) is threadedly connected to the transmission screw (622) through a ball nut pair. The moving plate (623) drives four parallel slide bars (624) to push the mounting base (625) to move, forming a four-column cantilever guide structure.

7. A detection method based on the automatic detection device for the tensile strength of a protective film according to any one of claims 1-6, characterized in that, Includes the following steps: Step 1: Clamp the membrane sample in the bidirectional clamp (3) system and set the tensile rate and deformation threshold; Step 2: Start the moving crossbeam (2) to load, and when the membrane is stretched, the equidistant adjustment component synchronously expands the coverage area of ​​the air nozzle and the sensor; Step 3: When the membrane material reaches the preset deformation, the trigger component (9) sends a signal to pause the stretching, and the transverse component (6) drives the air blowing and airflow detection component (402) to move to the preset gap; Step 4: The nozzle injects directional airflow, the sensor records the penetration parameters, the component resets, and the stretching continues; Step 5: Output the fracture strength, elongation, and air permeability curves under multiple strain levels when the sample breaks.

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