Testing device for high-elasticity blended fabric

Abstract

The invention relates to the technical field of fabric testing, in particular to a testing device for high-elasticity blended fabric. The device comprises a tensile strength testing machine, a lifting device is arranged on a workbench of the tensile strength testing machine, two clamp heads are symmetrically arranged on the lifting device, two fastening assemblies are symmetrically arranged in each clamp head, clamping blocks are fixedly connected to the ends of the fastening assemblies, and the two opposite clamping blocks jointly form a clamping face used for clamping the high-elastic fabric; each clamping block is of an elastic composite structure, a plurality of holes are formed in each clamping block, when the two clamping blocks move in the opposite directions and are pressed on the high-elasticity blended fabric, elastic clamping block bodies are pressed to deform, local negative pressure is generated at hole openings of the holes in the elastic clamping blocks under the action of compression deformation, the corresponding portions of the fabric are slightly adsorbed and slightly bulged towards the interiors of the holes, and therefore the fabric is formed. A plurality of micro anchor points are formed, and flexible adsorption contact replaces traditional rigid tooth top meshing.

Description

Technical Field

[0001] This invention relates to the field of fabric testing technology, and more specifically, to a testing device for high-elasticity blended fabrics. Background Technology

[0002] High-elasticity blended fabrics are widely used in sportswear, functional underwear, medical protective equipment and other fields because they combine elasticity, breathability and comfort and mechanical stability. In the fabric research and development stage, it is necessary to verify the effect of different fiber ratios on mechanical properties. Therefore, tensile strength testing machines are usually used for testing.

[0003] When existing tensile strength testing machines are working, clamping pressure is applied by mechanical drive, and the fabric sample is fixed in the clamping area by the friction between the contact surface of the clamp and the fabric. Then, the tensile action is achieved by the uniform lifting and lowering of the crossbeam. Finally, the tensile strength, elongation and other relevant parameters of the fabric are obtained by displacement curve.

[0004] Currently, most tensile strength testing machines use clamps with V-shaped teeth for their clamping mechanisms. For tensile strength testing of high-elasticity blended fabrics, due to the significant Poisson effect of elastic fibers such as spandex contained in these fabrics, longitudinal elongation during stretching is accompanied by significant transverse (radial) shrinkage (this is an inherent characteristic of elastic fibers; ordinary non-elastic fabrics have strong fibers and a weak Poisson effect, so radial shrinkage is negligible).

[0005] The contact surface of the V-shaped toothed clamp is composed of multiple raised wedge-shaped blocks and grooves, which are not continuous planes. When clamped, it causes the fabric end to form a wavy deformation. This wavy deformation causes a deviation between the initial width used to calculate stress in the test (the straight width during cutting) and the effective width under actual force (the actual bearing width after wavy deformation), resulting in a decrease in the accuracy of the stress value calculation results.

[0006] Therefore, the present invention proposes a testing device for high-elasticity blended fabrics. Summary of the Invention

[0007] This invention provides a testing device for high-elasticity blended fabrics. It utilizes a tensile strength testing machine with symmetrically arranged fastening components and elastic clamping blocks within the clamping head. The clamping blocks, employing a composite structure, have staggered holes inside. During compression, the elastic clamping blocks deform, creating localized negative pressure within the holes. This pressure pushes corresponding parts of the fabric slightly upwards into the holes, forming micro-anchor points. Simultaneously, the edges of the clamping blocks maintain a straight structure. By employing these micro-anchor points to ensure clamping force, the device avoids wavy deformation at the fabric ends, thereby solving the problems mentioned in the background art.

[0008] The V-shaped toothed clamps of existing tensile strength testing machines can cause wavy deformation at the ends of high-elasticity blended fabrics, resulting in a deviation between the initial width used to calculate stress and the effective width under actual force, thus reducing the accuracy of stress value calculation results.

[0009] To achieve the above objectives, the testing device for high-elasticity blended fabrics includes a tensile strength testing machine. A lifting device is installed on the worktable of the tensile strength testing machine, and two clamping heads are symmetrically arranged on the lifting device.

[0010] Each clamp head is symmetrically provided with two fastening components. The end of each fastening component is fixedly connected to a clamping block. The two opposing clamping blocks together form a clamping surface for clamping high-elastic fabric.

[0011] The clamping block is an elastic composite structure with multiple holes inside. When the two clamping blocks move towards each other and press against the high-elasticity blended fabric, the elastic clamping block body is deformed under pressure. Under the action of compression deformation, the holes inside generate local negative pressure at the opening, which slightly adsorbs the corresponding part of the fabric and bulges slightly into the holes, forming multiple micro anchor points.

[0012] A rotating component is provided at one end of the clamping block near the inner wall of the clamping head. When the high-elastic fabric is clamped by the clamping block and the clamping block is deformed by pressure, the edge of the high-elastic fabric comes into contact with the surface of the rotating component. During the tensile test, if the high-elastic fabric slips relative to the clamping block, the edge of the high-elastic fabric will drive the rotating component to rotate. The rotation angle of the rotating component indicates the degree of fabric slippage.

[0013] Based on this, the fastening assembly includes a screw that passes through and is threaded to the side wall of the clamping head. A push plate is fixedly connected to one end of the screw inside the clamping head. Multiple support rods extending towards the clamping block are fixedly connected to the push plate. When the screw is rotated, the screw's threaded transmission can drive the push plate to move smoothly in a straight line. The push plate then transmits the thrust to the clamping block through the multiple support rods, thereby adjusting the clamping force. The force is distributed through the multiple support rods, allowing the clamping block to be evenly compressed.

[0014] Preferably, the support rod is fixedly connected to the back of the clamping block. Since the support rod fixing points and holes are staggered, the thrust of the support rod will not act directly on the hole area, avoiding excessive deformation of the elastic material at the hole due to excessive local stress, and ensuring that the hole area can shrink evenly when the clamping block is compressed.

[0015] In the above technical solution, the clamping block is a composite structure, which includes an end layer, a compression layer and a flat layer in sequence from the side near the inner wall of the clamping head to the side near the middle of the high-elastic fabric along the direction perpendicular to the clamping surface. The hole penetrates the compression layer and the rotating component is disposed inside the groove of the end layer.

[0016] Preferably, the compression layer is made of soft silicone, and the end layer and the flat layer are made of metal. The clamping surface of the compression layer is trapezoidal and protrudes from the clamping surfaces of the end layer and the flat layer. When the two clamping blocks move toward each other, the protruding soft silicone part will preferentially contact the fabric and be compressed.

[0017] The holes on the two clamping blocks are staggered. When the clamping surfaces of the two clamping blocks are in contact, the hole on one clamping block is directly opposite the non-hole flat area on the clamping surface of the other clamping block. This avoids the problem of the fabric being sucked into the hole and forming a through-hole depression if the holes are aligned, which would damage the flatness of the end. The fabric is slightly raised into the corresponding hole at the holes of the upper and lower clamping blocks, forming staggered micro-anchor points, which enhances the flexible gripping force on the high-elasticity blended fabric and prevents the fabric from slipping when stretched.

[0018] Because the edge of the hole at one end of the clamping surface has a rounded transition surface, it can adapt to the curvature of the elastic fabric bulging into the hole, avoiding sharp holes from cutting or causing local pressure concentration on the soft, high-elasticity blended fabric fibers, ensuring a smooth bulging process without damaging the fabric.

[0019] In another technical solution, the rotating component includes a pressure roller, with rotating rods fixedly connected to both ends of the pressure roller. The rotating rods are rotatably supported inside the groove of the end layer, and part of the roller surface of the pressure roller protrudes from the clamping surface of the end layer. The pressure roller is made of hard silicone, and the elastic modulus of the pressure roller tends to be between the elastic modulus of the compression layer and the end layer material. An angle sensor is connected to one end of one of the rotating rods, and the angle sensor is used to detect and output the rotation angle signal of the rotating rod.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] The soft clamping layer of the composite structure elastic clamping block is combined with the staggered holes on the upper and lower sides. Combined with the straight edge structure of the clamping block, local negative pressure is generated in the holes when the clamping block is deformed under pressure. The adsorption effect forms micro anchor points on the surface of the high elastic fabric. The flexible adsorption contact replaces the traditional rigid tooth tip bite. The adsorption force forms a flexible bite with the fabric, ensuring the clamping and fixing effect of the two ends of the high elastic fabric during the stretching process.

[0022] Furthermore, by combining the flexible contact characteristics of the soft clamping layer with the straight edge structure, the wavy wrinkles at the fabric ends caused by the local pressure concentration at the rigid tooth tips of traditional toothed clamps are avoided, ensuring that the clamping end of the high-elastic fabric always remains flat; this makes the initial width used for stress calculation basically consistent with the effective width of the actual force, reducing stress calculation errors caused by width deviation and improving the accuracy of stress calculation. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the internal structure of the clamping head of the present invention;

[0025] Figure 3 This is a schematic diagram of the fastening assembly structure of the present invention;

[0026] Figure 4 This is a schematic diagram of the clamping direction of the clamping block in this invention;

[0027] Figure 5 This is a schematic diagram of the distribution structure of the holes and support rods of the present invention;

[0028] Figure 6 This is a schematic diagram of the rotating component structure of the present invention;

[0029] Figure 7 This is a schematic diagram showing the composite structure distribution of the clamping blocks of the present invention;

[0030] Figure 8 This is a schematic diagram showing the interlaced state of the holes on the two clamping blocks of the present invention;

[0031] Figure 9 This is a schematic diagram of the high-elasticity fabric clamping process of the present invention;

[0032] Figure 10 This is a schematic diagram of the hole diameter structure of the present invention.

[0033] The meanings of the labels in the diagram are as follows:

[0034] 1. Tensile strength testing machine; 11. Lifting device; 12. Clamp head;

[0035] 13. Fastening assembly; 130. Screw; 131. Push plate; 132. Support rod;

[0036] 14. Clip; 140. Compression layer; 141. End layer; 142. Flat layer;

[0037] 15. Holes;

[0038] 16. Rotating component; 160. Pressure roller; 161. Rotating rod. Detailed Implementation

[0039] 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.

[0040] Currently, the V-groove clamps in existing tensile strength testing machines cause wavy deformation at the ends of high-elasticity blended fabrics, resulting in a deviation between the initial width used for stress calculation and the actual effective width under stress, thus reducing the accuracy of stress value calculations. This invention provides a testing device for high-elasticity blended fabrics. (See [link to device]). Figures 1-2 As shown, the machine includes a tensile strength testing machine 1. A lifting device 11 is installed on the worktable of the tensile strength testing machine 1. Two clamping heads 12 are symmetrically arranged on the lifting device 11, and two fastening components 13 are symmetrically arranged inside each clamping head 12. (See reference...) Figure 3 As shown, the fastening assembly 13 includes a screw 130, which passes through and is threaded to the side wall of the clamp head 12. One end of the screw 130 located inside the clamp head 12 is fixedly connected to a push plate 131. Multiple support rods 132 extending toward the clamping block 14 are fixedly connected to the push plate 131. The multiple support rods 132 are fixedly connected to the back of the clamping block 14. Two opposing clamping blocks 14 together form a clamping surface for clamping high-elastic fabric.

[0041] See Figure 4 As shown, before the test, the operator rotates the screw 130, and with the help of the transmission characteristics of the threaded engagement, drives the push plate 131 located inside the clamp head 12 to move in a straight line; when the push plate 131 moves, it simultaneously drives multiple support rods 132 to move synchronously towards the clamp block 14.

[0042] Among them, such as Figure 5 As shown, the fixing point of the end of the support rod 132 on the clamping block 14 is staggered with the hole 15 on the clamping surface of the clamping block 14, so that the thrust transmitted by the support rod 132 will not directly act on the area where the hole 15 is located; the thrust will preferentially act on the non-hole 15 area of ​​the clamping block 14 and be evenly distributed on the back of the clamping block 14, thereby driving the clamping block 14 to move towards the fabric and complete the clamping and fixing of the high elasticity blended fabric.

[0043] Specifically, such as Figure 6 As shown, the clamping block 14 has multiple holes 15 inside, such as... Figure 7 As shown, the clamping block 14 is a composite structure. Along the direction perpendicular to the clamping surface, from the side near the inner wall of the clamping head 12 to the side near the middle of the high-elastic fabric, it includes an end layer 141, a compression layer 140 and a flat layer 142 in sequence. The hole 15 penetrates the compression layer 140, and the rotating part 16 is disposed inside the groove of the end layer 141.

[0044] The compression layer 140 is made of soft silicone. The good elasticity and flexibility of soft silicone allow it to deform evenly under pressure, preventing hard contact from squeezing or cutting the soft fibers of the high-elasticity blended fabric. The end layer 141 and the flat layer 142 are made of metal. The high structural strength and stability of metal provide structural support for the clamping block 14, preventing it from shifting or deforming under pressure and ensuring the uniformity of clamping force transmission.

[0045] When the two clamping blocks 14 move toward each other and press the fabric under the drive of the fastening component 13, the soft silicone compression layer 140 will preferentially contact the fabric because the compression layer 140 is convex in a trapezoidal shape, thus avoiding direct contact between the metal layer and the fabric and causing damage. At the same time, the metal end layer 141 and the flat layer 142 are supported by the structure to ensure that the clamping block 14 as a whole will not deform due to pressure, thus maintaining the overall flatness of the clamping surface.

[0046] See Figure 8 As shown, the holes 15 on the two clamping blocks 14 are staggered, as... Figure 9 As shown, the hole 15 has a through structure inside the clamping block 14; when the clamping surfaces of the two clamping blocks 14 are in contact, the hole 15 on one clamping block 14 is directly opposite the non-hole 15 flat area on the clamping surface of the other clamping block 14, so as to avoid the alignment of the holes 15 causing the fabric to be sucked into the hole 15 to form a through-type depression, thus ensuring the flatness of the fabric clamping end.

[0047] In this embodiment, see Figure 9 As shown, when the two clamping blocks 14 move toward each other and press against the high-elasticity blended fabric under the drive of the fastening component 13, since the compression layer 140 protrudes from the end layer 141 and the flat layer 142 in a trapezoidal shape, the soft silicone compression layer 140 will preferentially contact the fabric. As the clamping blocks 14 continue to apply pressure toward each other, the soft silicone compression layer 140 deforms due to its own elastic properties.

[0048] At this time, the deformation of the compression layer 140 will act synchronously on the hole 15, generating a local negative pressure at the opening of the hole 15, forming an active adsorption effect on the high elastic fabric in the contact area of ​​the hole 15, pushing the fabric to bulge slightly into the opening at the corresponding part of the hole 15, thereby forming multiple micro anchor points on the fabric surface.

[0049] Additionally, see Figure 10 As shown, the edge of the hole 15 at one end of the clamping surface is provided with an arc transition surface. The overall diameter of the hole 15 is set as a, and the diameter of the hole of its arc transition surface is denoted as b. Through the diameter transition from hole 15b to a, the fabric is guided to bulge into the hole 15 to ensure the uniform formation of micro anchor points.

[0050] When the two clamping blocks 14 continuously apply pressure to each other, the deformation of the soft silicone compression layer 140 causes the hole 15 to shrink and generate local negative pressure, which drives the high elastic blended fabric to bulge slightly into the hole 15. Since the overall diameter a of the hole 15 is smaller than the diameter b of the arc transition surface, a transition structure that gradually narrows from the outside to the inside is formed.

[0051] At this point, the raised fabric will first come into contact with the curved transition surface, and then gradually extend into the hole 15, avoiding the sharp edges of the traditional straight-edged hole 15 from cutting or scratching the soft elastic fabric fibers, thus protecting the integrity of the fabric structure. At the same time, the gentle curved structure can disperse the local pressure at the raised part of the fabric, prevent pressure concentration caused by the sharp edges of the hole, avoid the fabric from generating additional wrinkles in the raised area, and ensure that the fabric clamping end is flat overall.

[0052] In addition, a rotating component 16 is provided at one end of the clamping block 14 near the inner wall of the clamping head 12. The rotating component 16 includes a pressure roller 160. Both ends of the pressure roller 160 are fixedly connected to rotating rods 161. The rotating rods 161 are rotatably supported inside the groove of the last layer 141. Figure 9 In the process, after the clamping block 14 completes the clamping of the high elastic fabric and is deformed by pressure, because part of the roller surface of the pressure roller 160 of the rotating part 16 protrudes from the clamping surface of the end layer 141 of the clamping block 14, the edge of the high elastic fabric will make preferential contact with the surface of the pressure roller 160 compared with the end layer 141 during the clamping process.

[0053] During the tensile test, if the high-elastic fabric slips relative to the clamping block 14 due to the force, the edge of the fabric will drive the pressure roller 160 in contact with it to rotate through friction. Since the two ends of the pressure roller 160 are fixedly connected to the rotating rod 161, the rotation of the pressure roller 160 will synchronously drive the two rotating rods 161 to rotate together. By connecting an angle sensor (not shown in the figure) to the end of one of the rotating rods 161, the rotation of the rotating rod 161 will be directly captured by the angle sensor. The rotation angle of the rotating rod 161 is related to the distance and degree of fabric slippage. Therefore, by detecting the rotation angle of the rotating rod 161 through the angle sensor, the degree of slippage of the high-elastic fabric relative to the clamping block 14 can be directly reflected, realizing real-time monitoring of the fabric slippage state during the test.

[0054] It should be noted that the angle sensor works as is well known to those skilled in the art. Through internally integrated detection elements (such as photoelectric encoders and Hall effect sensors), it converts the mechanical rotation angle of the rotating rod 161 into an identifiable and processable electrical signal. In this device, the angle sensor is fixedly connected to the end of the rotating rod 161. When the rotating rod 161 rotates synchronously with the pressure roller 160, the angle sensor can capture the change in the rotation angle of the rotating rod 161 in real time and convert it into a pulse signal or analog voltage signal output. Since the rotation angle of the rotating rod 161 is exactly the same as the rotation angle of the pressure roller 160, and the rotation angle of the pressure roller 160 is linearly positively correlated with the sliding distance of the high-elastic fabric relative to the clamping block 14, the electrical signal output by the angle sensor can be converted into a specific amount of fabric slippage through the data processing unit, thereby achieving precise quantitative monitoring of the degree of fabric slippage during the tensile test.

[0055] The pressure roller 160 is made of hard silicone, and its elastic modulus is between that of the soft silicone of the compression layer 140 and the metal of the end layer 141. During the process of clamping and deforming the high-elastic fabric by the clamping block 14, the pressure roller 160 is in contact with the edge of the fabric due to the structural design of part of the roller surface protruding from the clamping surface of the end layer 141. Through the continuous clamping movement of the clamping block 14, the two pressure rollers 160 are squeezed. Combined with the flexible properties of the hard silicone, the pressure roller 160 undergoes adaptive micro-deformation, increasing the contact area with the edge of the fabric.

[0056] Meanwhile, the elastic modulus of the pressure roller 160, which is between the soft silicone of the compression layer 140 and the metal of the end layer 141, allows it to adapt to the overall deformation pattern of the clamping block 14. When the soft silicone of the compression layer 140 is compressed and undergoes elastic deformation, the pressure roller 160 can be flexibly adjusted according to the slight displacement of the end layer 141 to avoid contact gaps or jamming due to excessive modulus difference. When the metal of the end layer 141 provides stable support, the pressure roller 160 will not deform excessively due to low modulus, and always maintains reliable contact between the roller surface and the edge of the fabric.

[0057] It should be noted that the working principle of the tensile strength testing machine 1 described above is as well known to those skilled in the art. With the lifting device 11 as the core support, the two ends of the sample to be tested (high-elasticity blended fabric) are clamped in the clamping heads 12 on the lifting device 11 above the worktable. After the system controller in the tensile strength testing machine 1 sets the test parameters (such as tensile speed, upper load limit, displacement range, etc.), the system controller drives the power system (usually a servo motor coupled with a ball screw) within the lifting device 11, causing the clamping heads 12 to move at a uniform linear speed along the single-column axis, thereby applying a continuous and stable axial tensile force to the sample. During the test, the force sensor installed on the clamp head 12 or the power system collects the tensile force data of the sample in real time, and the displacement sensor records the moving distance of the clamp head 12 (i.e., the elongation of the sample) simultaneously. Both types of data are transmitted to the system controller in real time for calculation and processing, and are converted into mechanical indicators such as tensile strength, elongation at break, and elastic modulus. The tensile force and displacement curves are dynamically displayed on the screen. When the sample reaches the preset fracture condition (such as a sudden drop in load or displacement exceeding the limit) or the test parameter threshold, the system controller automatically issues a stop command, the power system stops running, and the equipment finally outputs a complete test data report, realizing the accurate detection of the mechanical properties of the sample.

[0058] Working principle:

[0059] Before testing, the operator starts the fastening assembly 13 by rotating the screw 130. With the precision of the threaded transmission, the push plate 131 moves in a straight line, pushing multiple support rods 132 to move synchronously towards the clamping block 14. Since the fixing points of the ends of the support rods 132 on the clamping block 14 are staggered with the holes 15 on the clamping surface of the clamping block 14, the thrust will be applied to the non-hole 15 area of ​​the clamping block 14 first and evenly distributed, avoiding direct force damage to the hole 15 area.

[0060] Based on this, the device enters the clamping and fixing stage. Due to the trapezoidal protrusion design of the soft silicone compression layer 140 in the clamping block 14, it will preferentially contact the high elasticity blended fabric, avoiding the hard compression or cut caused by the direct contact of the metal end layer 141 and the flat layer 142 with the fabric fibers.

[0061] As the clamping block 14 continues to apply pressure under the push of the support rod 132, the soft silicone compression layer 140 deforms due to its good elasticity. This deformation simultaneously causes the hole 15 that runs through it to contract, forming a local negative pressure at the opening. This creates an active adsorption effect on the fabric in the contact area, pushing the fabric to bulge slightly into the hole 15, forming evenly distributed micro-anchor points. The flexible adsorption and interlocking ensures the clamping stability during the stretching process.

[0062] Meanwhile, the holes 15 of the upper and lower clamping blocks 14 are staggered, which avoids the fabric being sucked in from both directions and forming a through-hole due to the alignment of the holes 15; the opening of the hole 15 has a smooth arc transition surface that narrows from the large diameter b to the small diameter a, which guides the fabric to rise smoothly, avoids the sharp edges of the traditional straight-edged holes 15 from cutting the fabric, disperses local pressure to prevent additional wrinkles, and ensures that the fabric clamping end always remains flat.

[0063] After clamping and fixing, the device enters the testing phase. The tensile strength testing machine 1 starts to operate according to the preset parameters. With the lifting device 11 as the core support, the system controller drives the power system to drive the clamp head 12 to make uniform linear motion along the axis, applying a continuous and stable axial tensile force to the clamped and fixed fabric.

[0064] Meanwhile, the force sensor of the testing machine collects the tensile force data of the fabric in real time, and the displacement sensor records the moving distance of the clamp head 12 (i.e. the fabric elongation) simultaneously. During the test, if the fabric slips relative to the clamp block 14 due to the force, the edge of the fabric will drive the pressure roller 160 to rotate through friction. Since the pressure roller 160 is made of hard silicone material with an elastic modulus between the soft silicone compression layer 140 and the metal end layer 141, it can produce adaptive micro-deformation when the clamp block 14 is compressed and deformed to increase the contact area with the edge of the fabric. At the same time, it can adapt to the overall deformation law of the clamp block 14, avoid contact gap or jamming due to excessive modulus difference, and prevent excessive deformation, always maintaining contact with the edge of the fabric.

[0065] The rotation of the pressure roller 160 synchronously drives the rotating rod 161 fixed at both ends to rotate. The angle sensor connected to the end of the rotating rod 161 converts this mechanical rotation angle into a processable electrical signal (such as a pulse signal or an analog voltage signal). Combining the linear positive correlation between the rotation angle of the rotating rod 161 and the fabric slippage distance, the specific slippage amount can be calculated by the data processing unit, realizing real-time monitoring of the slippage state.

[0066] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A testing device for high-elasticity blended fabrics, comprising a tensile strength testing machine (1), wherein a lifting device (11) is provided on the worktable of the tensile strength testing machine (1), and two clamping heads (12) are symmetrically arranged on the lifting device (11), characterized in that: Two fastening components (13) are symmetrically arranged in each clamp head (12). The end of the fastening component (13) is fixedly connected to a clamping block (14). The two opposing clamping blocks (14) together form a clamping surface for clamping high elastic fabric. The clamping block (14) is an elastic composite structure with multiple holes (15) inside. When the two clamping blocks (14) move towards each other and press against the high elasticity blended fabric, the body of the elastic clamping block (14) is deformed under pressure. Under the action of compression deformation, the holes (15) inside generate local negative pressure at the opening, which slightly adsorbs the corresponding part of the fabric and bulges slightly into the holes (15), forming multiple micro anchor points. The clamping block (14) is provided with a rotating part (16) at one end near the inner wall of the clamping head (12). When the high elastic fabric is clamped by the clamping block (14) and the clamping block (14) is deformed by pressure, the edge of the high elastic fabric contacts the surface of the rotating part (16). During the tensile test, if the high elastic fabric slips relative to the clamping block (14), the edge of the high elastic fabric will drive the rotating part (16) to rotate. The rotation angle of the rotating part (16) indicates the degree of fabric slippage.

2. The testing device for high-elasticity blended fabrics according to claim 1, characterized in that: The fastening assembly (13) includes a screw (130) that passes through and is threaded to the side wall of the clamp head (12). One end of the screw (130) located inside the clamp head (12) is fixedly connected to a push plate (131). Multiple support rods (132) extending toward the clamping block (14) are fixedly connected to the push plate (131).

3. The testing device for high-elasticity blended fabrics according to claim 1, characterized in that: The support rod (132) is fixedly connected to the back of the clamping block (14), and the fixing points of the ends of the multiple support rods (132) on the clamping block (14) are staggered with the multiple holes (15) on the clamping surface of the clamping block (14).

4. The testing device for high-elasticity blended fabrics according to claim 1, characterized in that: The clamping block (14) is a composite structure. Along the direction perpendicular to the clamping surface, from the side near the inner wall of the clamping head (12) to the middle of the high elastic fabric, it includes an end layer (141), a compression layer (140) and a flat layer (142). The hole (15) penetrates the compression layer (140), and the rotating part (16) is disposed inside the groove of the end layer (141).

5. The testing device for high-elasticity blended fabrics according to claim 1, characterized in that: The compression layer (140) is made of soft silicone, and the end layer (141) and the flat layer (142) are made of metal. The clamping surface of the compression layer (140) is trapezoidal and protrudes from the clamping surface of the end layer (141) and the flat layer (142).

6. The testing device for high-elasticity blended fabrics according to claim 1, characterized in that: The holes (15) on the two clamping blocks (14) are staggered. When the clamping surfaces of the two clamping blocks (14) are in contact, the hole (15) on one of the clamping blocks (14) is directly opposite the non-hole plane area on the clamping surface of the other clamping block (14).

7. The testing device for high-elasticity blended fabrics according to claim 1, characterized in that: The hole (15) has an arc transition surface at the edge of the opening at one end of the clamping surface. This arc transition surface is used to adapt to the curvature of the raised part of the elastic fabric.

8. The testing device for high-elasticity blended fabrics according to claim 1, characterized in that: The rotating component (16) includes a pressure roller (160), and both ends of the pressure roller (160) are fixedly connected to a rotating rod (161). The rotating rod (161) is rotatably supported inside the groove of the end layer (141), and part of the roller surface of the pressure roller (160) protrudes from the clamping surface of the end layer (141).

9. The testing device for high-elasticity blended fabrics according to claim 1, characterized in that: The pressure roller (160) is made of hard silicone, and the elastic modulus of the pressure roller (160) tends to be between the elastic modulus of the compression layer (140) and the end layer (141).

10. The testing device for high-elasticity blended fabrics according to claim 1, characterized in that: An angle sensor is connected to the end of one of the rotating rods (161), which is used to detect and output the rotation angle signal of the rotating rod (161).

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