A tensile strength testing device and method for textile fabrics

Abstract

The present invention discloses a tensile strength testing device and method for textile fabrics, and relates to the technical field of strength testing; specifically, it comprises a base and side frames fixed to both sides of the top of the base by bolts, and the side walls of each of the side frames are provided with a clamping test part, and the clamping test part. The present invention sets the clamping parts of the fabric as opposing clamping plates, and uses the tilting movable connection of the lever arm to realize the connection of the clamping plates, and also designs the tilting angle of the lever arm in a targeted manner, so that when subjected to a pulling force, the lever arm can perform "negative feedback" to adjust the clamping force of the clamping plate, so that the greater the pulling force, the greater the clamping force, and the smaller the pulling force, the smaller the clamping force, thereby realizing the adaptive and unpowered autonomous adjustment of the clamping force according to the pulling force, ensuring the reliability of the fixation while also increasing the service life.

Description

Technical Field

[0001] The invention relates to the technical field of strength testing, and in particular to a tensile strength testing device for textile fabrics and a method thereof. Background Art

[0002] Composite home textile fabric is a new type of fabric that uses advanced production technology to combine electric heating materials with cotton materials to achieve better warmth retention and comfort.

[0003] The characteristic of this fabric is that it can generate heat and release it when heated, thereby increasing the indoor temperature and comfort. At the same time, it also has the advantages of good breathability, softness and comfort, and not easy to deform, which can meet various home needs.

[0004] In actual use, the electrothermal cotton composite home textile fabric is required to have a certain tensile strength to avoid tearing during use.

[0005] After searching, the Chinese patent publication number CN113588427A discloses a textile fabric tensile strength testing device, including a base, a placing mechanism and a testing mechanism. The top of the base is provided with a placing mechanism, and the left and right sides of the top of the base are provided with testing mechanisms. The placing mechanism includes a bracket, a guide rail, a placing plate, a gear lever, a handle, a first guide rod, a sliding plate, a sliding rod and a first spring. Brackets are symmetrically arranged in the middle of the top of the base, guide rails are arranged between the tops of the brackets, a placing plate is slidably arranged on the top of the guide rails, and a gear lever is arranged on the front side of the top of the base.

[0006] The above patent has the following deficiencies: it is unable to adjust the clamping force on the fabric according to the actual pulling force. Therefore, when the pulling force is small and the clamping force is large, the load on the clamping component will be large and the service life will be reduced. When the pulling force is large and the clamping force is small, the fabric will slip and the test will fail.

[0007] To this end, the present invention provides a tensile strength testing device for textile fabrics and a method thereof. Summary of the invention

[0008] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a tensile strength testing device and method for textile fabrics.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] A tensile strength testing device for textile fabrics comprises a base and side frames fixed to both sides of the top of the base by bolts.

[0011] The side wall of each side frame is provided with a clamping test part, and the clamping test part includes an assembly frame slidably connected to the side wall of the side frame through a guide rod and a support frame fixed to the top and bottom side walls of the assembly frame through bolts, and a group of adaptive clamping mechanisms are respectively provided on opposite sides of the support frame, and the two groups of adaptive clamping mechanisms are symmetrical to each other;

[0012] The adaptive clamping mechanism comprises a clamping plate and a lever arm, one end of the lever arm is rotatably connected to the clamping plate, the side wall of the other end of the lever arm is rotatably connected to the inner side of the support frame through a hinge shaft, and the two clamping plates that cooperate with each other are respectively provided with arc-surface protrusions and arc-surface grooves that cooperate with each other;

[0013] The lever arm is arranged obliquely, and the inclination angle of the lever arm relative to the horizontal plane is satisfy , where μ is the dynamic friction coefficient of the clamping plate relative to the fabric.

[0014] Preferably: the adaptive clamping mechanism also includes a driving mechanism for driving the support frame, the driving mechanism includes a cylinder body and a limiting baffle welded to the inner wall of the middle part of the cylinder body, the cylinder body is fixed to the inner wall of the support frame by bolts, and the inner walls of the cylinder body on both sides of the limiting baffle are respectively slidably connected with piston one and piston two, the side wall of piston two is welded with piston rod two, the other end of piston rod two is fixed to the side wall of the side frame by bolts, the side walls of the cylinder body at both ends are welded with ventilation nozzles, the ventilation nozzles are connected to the inner cavity of the cylinder body, and the ventilation nozzles are connected to the gas drive assembly.

[0015] Furthermore: a piston rod 1 is welded to the side wall of the piston 1, the end of the piston rod 1 is rotatably connected to a connecting rod, the other end of the connecting rod is rotatably connected to a connecting arm, and the connecting arm is rotatably connected to the top side wall of the lever arm.

[0016] On the basis of the above-mentioned solution: the side walls of the assembly frame are respectively welded with rib one and rib two, and the other ends of rib one and rib two are welded to the side walls of the support frame.

[0017] A better solution among the above solutions is: the gas drive component includes a two-way air pump, a safety valve and a multi-way pipe, the two-way air pump is connected to the multi-way pipe through the safety valve, and the multi-way pipe is connected to the ventilation nozzle.

[0018] As a further solution of the present invention: the side wall of the piston 2 is buckled with a spring 2, the other end of which is buckled with the inner wall of the cylinder body; the side wall of the piston 1 is buckled with a spring 1, the other end of which is buckled with the inner wall of the cylinder body.

[0019] At the same time, the safety valve includes a valve body and connectors welded to both ends of the valve body flow channel, one side of the connector is connected to an end cover via a thread, and the other side of the valve body is provided with an adjustment component.

[0020] As a preferred embodiment of the present invention: a limiting ring is welded to the inner wall of one side of the valve body, a valve core is slidably fitted to the inner wall of the valve body located on the side of the limiting ring, and an air leakage hole is opened on the side wall of the valve body.

[0021] At the same time, the adjusting assembly includes an adjusting bolt and a slider, the adjusting bolt is rotatably connected to the valve body, and the slider is slidably connected to the inner wall of the valve body, the adjusting bolt is threadedly connected to the inner wall of the slider, the slider and the opposite side of the valve core are buckled with a tension spring, the outer wall of the adjusting bolt is threadedly connected to a anti-loosening nut, and a shaft seal is provided at the rotating connection between the adjusting bolt and the valve body.

[0022] As a more optimal solution of the present invention: the inner walls of the valve core on both sides of the air leakage hole are provided with sealing cavities, the inner walls of the sealing cavities are bonded with flexible rings, and the sealing cavities are connected to the cavity of the valve core through a channel.

[0023] The beneficial effects of the present invention are:

[0024] 1. The present invention sets the clamping parts of the cloth as opposing clamping plates, and uses the tilted movable connection of the lever arm to realize the connection of the clamping plates. In addition, the tilt angle of the lever arm is specifically designed, so that when subjected to a pulling force, the lever arm can perform "negative feedback" to adjust the clamping force of the clamping plate, so that the greater the pulling force, the greater the clamping force, and the smaller the pulling force, the smaller the clamping force, thereby realizing adaptive and unpowered autonomous adjustment of the clamping force according to the pulling force, ensuring the reliability of the fixation while also increasing the service life.

[0025] 2. The present invention, by respectively arranging arcuate protrusions and arcuate grooves on the clamping plates on both sides of the fabric, can fix the fabric in the form of mutual "biting", increase the sliding friction coefficient of the entire clamping plate relative to the fabric, and reduce the overall pressure bearing capacity; on the other hand, it can also make the contact area between the fabric and the clamping plate relatively large, preventing tearing caused by large local stress.

[0026] 3. The present invention, by setting a cylinder body to cooperate with piston 1 and piston 2 which are opposite to each other, can satisfy the force required for the pulling force test on the one hand, and on the other hand, can also make the lever arm have a rotation tendency through the pressure generated by the air pressure, and then use the rotation tendency to increase the clamping force of the clamping plate, thereby ensuring the stability of the clamping. Moreover, the driving sources of the two are the same, which can be achieved only by delivering air, thus reducing the power layout and facilitating volume optimization and cost control.

[0027] 4. The present invention, by providing rib one and rib two, enables the position of the support frame away from the fixed point to be subject to the limiting force of rib one and rib two, so that the overall structure is a stable triangular structure, thereby effectively preventing the support frame from being deformed by force.

[0028] 5. The present invention, by setting a safety valve, utilizes the principle of equal pressure, so that when the pulling force reaches the maximum value or the preset value, the pressure can be automatically released, thereby ensuring the safety of the device. In addition, by setting a slider, the stretching amount of the tension spring can be adjusted by changing the position of the slider, thereby achieving the function of adjusting the maximum pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of a tensile strength testing device for textile fabrics proposed by the present invention;

[0030] Figure 2 This is a schematic diagram of the structure of a clamping test part of a tensile strength test device for textile fabrics proposed by the present invention;

[0031] Figure 3 A schematic diagram of the structure of an adaptive clamping mechanism for a tensile strength testing device for textile fabrics proposed by the present invention;

[0032] Figure 4 A partial cross-sectional structural schematic diagram of a tensile strength testing device for textile fabrics proposed by the present invention;

[0033] Figure 5 A schematic diagram of the structure of a clamping plate of a tensile strength testing device for textile fabrics proposed by the present invention;

[0034] Figure 6 This is a schematic diagram of the structure of the assembly frame and the support frame of a tensile strength testing device for textile fabrics proposed by the present invention;

[0035] Figure 7 This is a schematic diagram of the safety valve structure of a tensile strength testing device for textile fabrics proposed by the present invention;

[0036] Figure 8 This is a schematic cross-sectional structure diagram of a safety valve of a tensile strength testing device for textile fabrics proposed by the present invention;

[0037] Fig. 9 A schematic diagram of a cross-sectional structure of a valve core of a tensile strength testing device for textile fabrics proposed by the present invention;

[0038] Fig.10 The present invention provides a schematic diagram of the pipeline structure of a tensile strength testing device for textile fabrics.

[0039] In the figure: 1, base; 2, side frame; 3, clamping test part; 4, assembly frame; 5, guide rod; 6, support frame; 7, adaptive clamping mechanism; 8, clamping plate; 9, lever arm; 10, connecting arm; 11, hinge shaft; 12, connecting rod; 13, piston rod 1; 14, spring 1; 15, piston 1; 16, vent nozzle; 17, spring 2; 18, cylinder body; 19, piston rod 2; 20, piston 2; 21. Limiting baffle; 22. Arc-surface protrusion; 23. Arc-surface groove; 24. Rib one; 25. Rib two; 26. Valve body; 27. Connector; 28. End cover; 29. ​​Adjustment assembly; 30. Anti-loosening nut; 31. Adjustment bolt; 32. Slider; 33. Tension spring; 34. Valve core; 35. Vent hole; 36. Limiting ring; 37. Channel; 38. Flexible ring; 39. Sealing chamber; 40. Shaft seal. DETAILED DESCRIPTION

[0040] The technical solution of the present invention is further described in detail below in conjunction with specific implementation methods.

[0041] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0042] Embodiment 1:

[0043] A tensile strength testing device for textile fabrics, such as Figure 1-10 As shown, it includes a base 1 and side frames 2 fixed to both sides of the top of the base 1 by bolts, each side wall of the side frame 2 is provided with a clamping test part 3, the clamping test part 3 includes an assembly frame 4 slidably connected to the side wall of the side frame 2 through a guide rod 5 and a support frame 6 fixed to the top and bottom side walls of the assembly frame 4 by bolts, and a group of adaptive clamping mechanisms 7 are respectively provided on the opposite side of the support frame 6, and the two groups of adaptive clamping mechanisms 7 are symmetrical to each other.

[0044] The adaptive clamping mechanism 7 includes a clamping plate 8 and a lever arm 9, one end of the lever arm 9 is rotatably connected to the clamping plate 8, and the side wall of the other end of the lever arm 9 is rotatably connected to the inner side of the support frame 6 through a hinge shaft 11, and the two clamping plates 8 that cooperate with each other are respectively provided with arc surface protrusions 22 and arc surface grooves 23 that cooperate with each other.

[0045] The lever arm 9 is arranged in an inclined manner, and the inclination angle of the lever arm 9 relative to the horizontal plane is satisfy , where μ is the dynamic friction coefficient of the clamping plate 8 relative to the fabric.

[0046] When the device is in use, the cloth can be placed between the upper and lower opposing clamping plates 8, and then the opposing clamping plates 8 are used to initially fix the cloth, and then the support frames 6 on both sides can be moved outwards, so that a pulling force can be applied to the cloth, and the strength test can be completed by observing whether the cloth is torn under a certain pulling force or collecting the pulling force at the time when the cloth is torn. In addition, since the lever arm 9 is arranged obliquely and the clamping plate 8 can be relatively rotated through the lever arm 9, when the clamping plate 8 applies a lateral pulling force to the cloth, the clamping plate 8 will also be subjected to a reaction force of the cloth. The reaction force is achieved through friction, so that the lever arm 9 has a tendency to rotate due to the lateral force of the clamping plate 8, and because , so that when the lever arm 9 rotates, it will feedback and increase the pressure of the clamping plate 8 on the cloth.

[0047] The device sets the cloth clamping parts as opposing clamping plates 8, and uses the tilted movable connection of the lever arm 9 to achieve the connection of the clamping plates 8. In addition, the tilt angle of the lever arm 9 is specifically designed, so that when subjected to a pulling force, the lever arm 9 can perform "negative feedback" to adjust the clamping force of the clamping plate 8, so that the greater the pulling force, the greater the clamping force, and the smaller the pulling force, the smaller the clamping force, thereby achieving adaptive and unpowered autonomous adjustment of the clamping force according to the pulling force, ensuring the reliability of the fixation while also increasing the service life.

[0048] In addition, the device provides arcuate protrusions 22 and arcuate grooves 23 on the clamping plates 8 on both sides of the fabric, which can fix the fabric in the form of mutual "biting" on one hand, increase the sliding friction coefficient of the entire clamping plate 8 relative to the fabric, and reduce the overall pressure bearing capacity; on the other hand, it can also make the contact area between the fabric and the clamping plate 8 relatively large, preventing tearing caused by large local stress.

[0049] In order to solve the pulling problem; Figure 3 , 4 As shown, the adaptive clamping mechanism 7 also includes a driving mechanism for driving the support frame 6, the driving mechanism includes a cylinder body 18 and a limiting baffle 21 welded to the inner wall of the middle part of the cylinder body 18, the cylinder body 18 is fixed to the inner wall of the support frame 6 by bolts, and the inner walls of the cylinder body 18 on both sides of the limiting baffle 21 are slidably connected with piston 15 and piston 2 20 respectively, the side wall of the piston 2 20 is welded with piston rod 2 19, and the other end of the piston rod 2 19 is fixed to the side wall of the side frame 2 by bolts, and the side walls of the cylinder body 18 at both ends are welded with ventilation nozzles 16, the ventilation nozzles 16 are connected to the inner cavity of the cylinder body 18, and the ventilation nozzles 16 are connected to the gas drive assembly.

[0050] The side wall of the piston 15 is welded with a piston rod 13, the end of the piston rod 13 is rotatably connected to a connecting rod 12, the other end of the connecting rod 12 is rotatably connected to a connecting arm 10, and the connecting arm 10 is rotatably connected to the top side wall of the lever arm 9.

[0051] When the gas drive assembly inputs gas into the cylinder 18, the air pressure in the rodless chamber of the cylinder 18 increases, so that on the one hand, the piston 20 is subjected to air pressure, and the cylinder 18 and the piston rod 2 19 are in relative position, and this displacement is used to apply a pulling test force. On the other hand, the piston 15 is also displaced relative to the cylinder 18 due to the pressure, thereby pulling the connecting arm 10 through the connecting rod 12, so that the lever arm 9 has a tendency to rotate, and the longitudinal component force generated by the rotational drive is then used to increase the clamping force of the clamping plate 8 on the fabric.

[0052] The device, by providing a cylinder body 18 to cooperate with the opposing piston 15 and piston 2 20, can, on the one hand, meet the force required for the pulling force test, and on the other hand, can also make the lever arm 9 have a rotation tendency through the pressure generated by the air pressure, and then use the rotation tendency to increase the clamping force of the clamping plate 8, thereby ensuring the stability of the clamping, and the two have the same driving source, which can be achieved only by delivering air, reducing the power layout, and facilitating volume optimization and cost control.

[0053] To solve the strength problem, such as Figure 6 As shown, the side walls of the assembly frame 4 are respectively welded with rib 1 24 and rib 2 25 , and the other ends of rib 1 24 and rib 2 25 are welded to the side walls of the support frame 6 .

[0054] Since the support frame 6 is relatively long, only using a single point fixation of the support frame 6 and the assembly frame 4 will cause the support frame 6 to have a large bending moment when subjected to the clamping reaction force, causing deformation. Based on this, the present device, by providing ribs 1 24 and ribs 2 25, enables the position of the support frame 6 away from the fixed point to also be subjected to the limiting force of ribs 1 24 and ribs 2 25, thereby making the overall structure present a stable triangular structure, thereby effectively preventing the support frame 6 from being deformed by force.

[0055] To solve the gas drive problem, such as Fig.10 As shown, the gas drive assembly includes a bidirectional air pump, a safety valve and a multi-way pipe. The bidirectional air pump is connected to the multi-way pipe through the safety valve, and the multi-way pipe is connected to the ventilation nozzle 16.

[0056] When the bidirectional air pump is started, it can input gas into the multi-way pipe through the safety valve, thereby delivering the gas to the ventilation nozzle 16.

[0057] The side wall of the piston 20 is buckled with a spring 2 17 , and the other end of the spring 2 17 is buckled with the inner wall of the cylinder 18 . The side wall of the piston 1 15 is buckled with a spring 14 , and the other end of the spring 14 is buckled with the inner wall of the cylinder 18 .

[0058] To address security issues, such as Figure 7-9 As shown, the safety valve includes a valve body 26 and connectors 27 welded to both ends of the flow channel of the valve body 26 , one side of the connector 27 is connected to an end cover 28 by threads, and the other side of the valve body 26 is provided with an adjustment component 29 .

[0059] A limit ring 36 is welded to the inner wall of one side of the valve body 26 , a valve core 34 is slidably fitted to the inner wall of the valve body 26 on one side of the limit ring 36 , and an air leakage hole 35 is opened on the side wall of the valve body 26 .

[0060] The adjusting assembly 29 includes an adjusting bolt 31 and a slider 32. The adjusting bolt 31 is rotatably connected to the valve body 26, and the slider 32 is slidably connected to the inner wall of the valve body 26. The adjusting bolt 31 is threadedly connected to the inner wall of the slider 32. A tension spring 33 is buckled on the opposite side of the slider 32 and the valve core 34. The outer wall of the adjusting bolt 31 is threadedly connected to a locking nut 30. A shaft seal 40 is provided at the rotating connection between the adjusting bolt 31 and the valve body 26.

[0061] The inner wall of the valve core 34 on both sides of the air leakage hole 35 is provided with a sealing cavity 39 , a flexible ring 38 is bonded to the inner wall of the sealing cavity 39 , and the sealing cavity 39 is connected to the cavity of the valve core 34 through a channel 37 .

[0062] When the air pressure in the cylinder 18 increases, the air pressure inside the valve body 26 increases, thereby increasing the pressure on the valve core 34, causing the valve core 34 to overcome the tension of the tension spring 33 and move until the pressure reaches the threshold value. The valve core 34 moves to the end, and the air vent 35 is connected to the flow channel of the valve body 26, thereby achieving the pressure relief function, and the position of the slider 32 can also be adjusted by rotating the adjusting bolt 31, thereby adjusting the initial stretching amount of the tension spring 33 and adjusting the maximum pressure.

[0063] This device, by setting a safety valve and utilizing the principle of equal pressure, can automatically release pressure when the pulling force reaches a maximum value or a preset value, thereby ensuring the safety of the device. In addition, by setting a slider 32, the stretching amount of the tension spring 33 can be adjusted by changing the position of the slider 32, thereby achieving the function of adjusting the maximum pressure.

[0064] When the present embodiment is in use, the cloth can be placed between the upper and lower opposing clamping plates 8, and then the cloth is initially fixed by using the opposing clamping plates 8, and then the support frames 6 on both sides can be moved outwards, so that a pulling force can be applied to the cloth, and the strength test can be completed by observing whether the cloth is torn under a certain pulling force or collecting the pulling force at the time when the cloth is torn. In addition, since the lever arm 9 is arranged obliquely and the clamping plate 8 can rotate relatively through the lever arm 9, when the clamping plate 8 applies a lateral pulling force to the cloth, the clamping plate 8 will also be subjected to a reaction force of the cloth, and the reaction force is realized by friction, so that the lever arm 9 will have a tendency to rotate due to the lateral force of the clamping plate 8, and because , so that when the lever arm 9 rotates, it will feedback to increase the pressure of the clamping plate 8 on the cloth. At the same time, when the two-way air pump is started, it can input gas into the multi-way pipe through the safety valve, thereby transporting the gas to the ventilation nozzle 16, and the air pressure in the rodless chamber of the cylinder body 18 increases, so that on the one hand, the piston 20 is subjected to air pressure, and the cylinder body 18 and the piston rod 2 19 are in relative position, and this displacement is used to apply a pulling test force. On the other hand, the piston 15 is also displaced relative to the cylinder body 18 when it is subjected to pressure, thereby pulling the connecting arm 10 through the connecting rod 12, so that the lever arm 9 has a tendency to rotate, and then the longitudinal component force generated by the rotation drive is used to increase the clamping force of the clamping plate 8 on the fabric.

[0065] Embodiment 2:

[0066] A method for testing the tensile strength of electrothermal cotton composite home textile fabrics, such as Figure 1-10 As shown: the following steps are included:

[0067] S1: placing the fabric between the upper and lower opposing clamping plates 8, and then initially fixing the fabric using the opposing clamping plates 8;

[0068] S2: gas is input into the cylinder 18 through a bidirectional air pump, thereby applying a pulling force and a clamping force;

[0069] S3: When the pulling force reaches the required test force, observe whether the fabric is torn, or observe the test force when the fabric is torn to obtain the test strength.

[0070] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A tensile strength testing device for textile fabrics, comprising a base (1) and side frames (2) fixed to both sides of the top of the base (1) by bolts, characterized in that: The side wall of each side frame (2) is provided with a clamping test portion (3), the clamping test portion (3) comprising an assembly frame (4) slidably connected to the side wall of the side frame (2) via a guide rod (5) and a support frame (6) fixed to the top and bottom side walls of the assembly frame (4) via bolts, and a group of adaptive clamping mechanisms (7) are respectively provided on opposite sides of the support frame (6), and the two groups of adaptive clamping mechanisms (7) are symmetrical to each other; The adaptive clamping mechanism (7) comprises a clamping plate (8) and a lever arm (9), one end of the lever arm (9) is rotatably connected to the clamping plate (8), and the side wall of the other end of the lever arm (9) is rotatably connected to the inner side of the support frame (6) via a hinge shaft (11), and the two mutually matching clamping plates (8) are respectively provided with mutually matching arc surface protrusions (22) and arc surface grooves (23); The lever arm (9) is arranged in an inclined manner, and the inclination angle of the lever arm (9) relative to the horizontal plane is satisfy , where μ is the dynamic friction coefficient of the clamping plate (8) relative to the fabric; The adaptive clamping mechanism (7) further comprises a driving mechanism for driving the support frame (6), the driving mechanism comprising a cylinder body (18) and a limit baffle (21) welded to the inner wall of the middle part of the cylinder body (18), the cylinder body (18) being fixed to the inner wall of the support frame (6) by bolts, and the inner walls of the cylinder body (18) on both sides of the limit baffle (21) are slidably connected with piston 1 (15) and piston 2 (20), respectively, the side wall of the piston 2 (20) is welded with piston rod 2 (19), the other end of the piston rod 2 (19) is fixed to the side wall of the side frame (2) by bolts, the side walls of the cylinder body (18) at both ends are welded with ventilation nozzles (16), the ventilation nozzles (16) are connected to the inner cavity of the cylinder body (18), and the ventilation nozzles (16) are connected to the gas driving assembly; A piston rod 1 (13) is welded to the side wall of the piston 1 (15); the end of the piston rod 1 (13) is rotatably connected to a connecting rod (12); the other end of the connecting rod (12) is rotatably connected to a connecting arm (10); and the connecting arm (10) is rotatably connected to the top side wall of the lever arm (9).

2. The tensile strength testing device for textile fabrics according to claim 1, characterized in that: The side walls of the assembly frame (4) are respectively welded with rib one (24) and rib two (25), and the other ends of rib one (24) and rib two (25) are welded to the side walls of the support frame (6).

3. The tensile strength testing device for textile fabrics according to claim 1, characterized in that: The gas drive assembly comprises a bidirectional air pump, a safety valve and a multi-way pipe, wherein the bidirectional air pump is connected to the multi-way pipe via the safety valve, and the multi-way pipe is connected to the ventilation nozzle (16).

4. The tensile strength testing device for textile fabrics according to claim 1, characterized in that: The side wall of the second piston (20) is buckled with a second spring (17), the other end of which is buckled with the inner wall of the cylinder body (18); the side wall of the first piston (15) is buckled with a first spring (14), the other end of which is buckled with the inner wall of the cylinder body (18).

5. The tensile strength testing device for textile fabrics according to claim 3, characterized in that: The safety valve comprises a valve body (26) and connectors (27) welded to both ends of a flow passage of the valve body (26); one side of the connector (27) is threadedly connected to an end cover (28); and the other side of the valve body (26) is provided with an adjustment assembly (29).

6. The tensile strength testing device for textile fabrics according to claim 5, characterized in that: A limit ring (36) is welded to the inner wall of one side of the valve body (26), a valve core (34) is slidably fitted to the inner wall of the valve body (26) located on one side of the limit ring (36), and an air leakage hole (35) is provided on the side wall of the valve body (26).

7. The tensile strength testing device for textile fabrics according to claim 6, characterized in that: The adjusting assembly (29) comprises an adjusting bolt (31) and a slider (32); the adjusting bolt (31) is rotatably connected to the valve body (26), and the slider (32) is slidably connected to the inner wall of the valve body (26); the adjusting bolt (31) is threadedly connected to the inner wall of the slider (32); a tension spring (33) is buckled on one side of the slider (32) opposite to the valve core (34); a locking nut (30) is threadedly connected to the outer wall of the adjusting bolt (31); and a shaft seal (40) is provided at the rotatable connection between the adjusting bolt (31) and the valve body (26).

8. The tensile strength testing device for textile fabrics according to claim 7, characterized in that: The inner walls of the valve core (34) on both sides of the air leakage hole (35) are provided with sealing cavities (39), the inner walls of the sealing cavities (39) are bonded with flexible rings (38), and the sealing cavities (39) are connected to the cavity of the valve core (34) through channels (37).

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