A nonwoven tensile strength testing device

Abstract

The present application relates to the field of cloth characteristic testing device, and specifically discloses a non-woven fabric tensile strength testing device, which comprises a machine table and a pair of sample carriers, the sample carriers are arranged on the machine table, each of the sample carriers is provided with a winding roller for winding and fixing a sample, and the device further comprises a guide mechanism, a locking mechanism and a pair of transmission racks, the guide mechanism comprises a pair of transmission racks and an intermediate gear engaged with the pair of transmission racks, the pair of transmission racks are movably arranged on the bottom of the machine table, and the upper portions of the pair of transmission racks are one-to-one connected to the pair of sample carriers, the locking mechanism comprises a plurality of first ratchet teeth arranged on the machine table in the stretching direction and a limiting tooth arranged on at least one transmission rack, and the limiting tooth is configured to be elastically clamped into the tooth gap of the plurality of first ratchet teeth. The non-woven fabric tensile strength testing device has the advantage of preventing the sample from appearing the back-off phenomenon during being stretched to the breaking peak.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cloth property testing devices, and in particular to a non-woven fabric tensile strength testing device. BACKGROUND

[0002] The YG026 electronic fabric strength machine is a current model for testing the tensile strength of non-woven fabric samples. This model generally uses a ball screw arranged in the longitudinal direction and symmetric optical shafts for transmission to control the movement of the clamps, and uses constant speed stretching to record the breaking tensile strength, breaking elongation and other tensile indicators of the sample. However, this model has the following defects when testing the breaking strength. On the ball screw arranged vertically along the longitudinal direction, the clamp nut seat has poor self-locking ability due to its own inertia force and a friction angle smaller than the screw helix angle, which easily leads to the phenomenon of the clamp nut seat retreating due to its inability to accurately lock its position at the breaking peak, thereby causing a large error in the breaking tensile length measured.

[0003] To this end, a Chinese patent with the publication number CN215296946U and the publication date of May 17, 2021 has been proposed, which specifically discloses a non-woven fabric tensile strength testing device. The testing device specifically includes a base and a pair of support rods. The top of the base is provided with a sliding groove extending along the length direction of the base. The bottom of the support rod is provided with a sliding block that slides in the sliding groove. A first air cylinder is arranged between the sliding blocks. The cylinder bottom of the first air cylinder and the push rod of the first air cylinder are respectively and one-to-one fixedly connected with the pair of sliding blocks. This scheme uses a pair of winding rollers to keep the non-woven fabric in a horizontal tension state. The first air cylinder is used to increase the distance between the two sliding blocks, so that the non-woven fabric is in a stretched state, thereby testing the tensile strength of the non-woven fabric. To some extent, this scheme overcomes the problem of the clamp retreating due to its inability to accurately lock its position at the breaking peak in the existing YG026 model.

[0004] However, there are potential defects in the use process, such as Figure 7As shown, one is to push the slider carrying the sample directly through the cylinder, as the tensile force of the sample increases, it is difficult for the slider to keep uniform speed, that is, the stretching speed will change, and the change of the stretching speed will also change the mechanical behavior, generally, the stress and tensile strength increase with the fast stretching speed, and the elongation at break will decrease, only when the stretching speed is the same, the test data has comparability, therefore, the test device in the above scheme has large deviation of test results. The sample around the roller in the above two will be subjected to a large tensile force when reaching the breaking peak, the tensile force of high-strength non-woven fabric at the breaking peak can reach more than 5KN, and in the above test device, the tensile force is completely borne by the roller on the upper part of the supporting rod, and the pushing force of the first cylinder is borne by the slider on the lower part of the supporting rod, so that the pushing force of the first cylinder and the tensile force of the sample will make the supporting rod and the slider at the bottom thereof subjected to a torque turning to the tensile side, therefore, the supporting rod and the slider have the risk of overturning, and the safety is poor. SUMMARY

[0005] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art, and to provide a non-woven fabric tensile strength testing device, which not only can prevent the sample from appearing back phenomenon during being stretched to the breaking peak, but also can keep the sample in the state of constant speed stretching during testing, so that the testing precision is high.

[0006] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0007] A non-woven fabric tensile strength testing device, comprising a machine table and a pair of sample carriers, the pair of sample carriers are arranged on the machine table in a relative movable manner, each of the sample carriers is provided with a winding roller for winding and fixing a sample, further comprising: a guide mechanism comprising a pair of transmission racks and an intermediate gear engaged with the pair of transmission racks; the pair of transmission racks are movably arranged on the bottom of the machine table and the moving directions of the two transmission racks are opposite, the upper parts of the pair of transmission racks are connected to the pair of sample carriers in a one-to-one manner; a driving component adapted to drive the intermediate gear to rotate at a constant speed; and a locking mechanism comprising a plurality of first ratchets arranged on the machine table in the stretching direction and a limiting tooth arranged on at least one transmission rack, the limiting tooth is configured to be elastically clamped into the tooth gap of the plurality of first ratchets to limit the movement of the at least one transmission rack towards the side away from the stretching direction but allow its movement towards the stretching direction.

[0008] In the above scheme, the intermediate gear is driven to rotate at a constant speed by the driving component, and then the two transmission racks are driven to move to the stretching side, and then the stretching force is applied to the sample by the winding roller on the sample stage. On the one hand, the sample can be stretched at a constant speed. On the other hand, the guiding mechanism composed of a pair of transmission racks and the intermediate gear engaged with the two transmission racks guides the sample stage to move in the stretching direction. The gear and rack positioning accuracy is high. Compared with the prior art, the device can more accurately determine the position of the sample stage and then determine the stretching length of the sample.

[0009] The locking mechanism composed of the limiting tooth and the plurality of first ratchets can limit the corresponding transmission rack from moving to the side away from the stretching side, and then limit the corresponding sample stage from moving to the side away from the stretching side, and then limit the sample from moving to the side away from the stretching side during the process of being gradually stretched to the breaking peak. In addition, the driving component is quickly braked at the moment of sample breaking to timely limit the movement of the transmission rack to the stretching side, and then limit the movement of the sample stage to the stretching side. That is, the test device can effectively prevent the sample from retreating during the process of being stretched to the breaking peak, and prevent the sample from moving forward due to inertia at the moment of breaking. That is, the stretching position and the breaking position of the sample can be accurately recorded, and the accuracy of the breaking test is improved.

[0010] To optimize the above technical solution, the following technical measures are taken:

[0011] As a preferred embodiment, the locking mechanism further comprises a mounting seat, an extension column, and a first push spring. The top of the extension column is connected to the mounting seat, the limiting tooth is installed at the bottom of the extension column, and the first push spring is connected between the limiting tooth and the mounting seat. The first push spring is adapted to push the limiting tooth to combine it in the tooth gap of the corresponding plurality of first ratchets.

[0012] As a preferred embodiment, each of the sample stages is provided with a mounting vertical plate for installing the corresponding winding roller. The machine table is provided with a measurement guide frame in the stretching direction. The mounting vertical plate is slidably connected in the measurement guide frame.

[0013] As a preferred embodiment, a lateral support mechanism is further included. The lateral support mechanism comprises a lateral support rod and a plurality of second ratchets. One end of the lateral support rod is rotatably connected to the corresponding mounting vertical plate. The other end of the lateral support rod is provided with a limiting pawl. The measurement guide frame is provided with a plurality of second ratchets. The limiting pawl is configured to be elastically clamped into the tooth gap of the plurality of second ratchets to limit the movement of the lateral support rod to the side away from the stretching side but allow its movement to the stretching side.

[0014] In this preferred scheme, through the lateral support mechanism composed of lateral support rods, limit pawls and several second ratchets, when the sample drives the installation stand to tilt away from the stretching side at the breaking peak, the limit pawl is clamped into the tooth gap of the second ratchet, and a stable triangular support structure is formed by the installation stand, the lateral support rod and the measuring guide frame, so as to balance the excessive overturning moment and ensure the safety of the device.

[0015] As a preferred embodiment, the lateral support mechanism further comprises a second push spring arranged between the corresponding installation stand and the lateral support rod, and the second push spring is adapted to push the limit pawl to combine in the tooth gap of the corresponding second ratchet.

[0016] As a preferred embodiment, the bottom of each sample carrier has oppositely arranged engaging portions for connecting the corresponding transmission rack, and the machine table has a side sliding groove matched with the corresponding balance slider.

[0017] As a preferred embodiment, each winding roller is driven by a preloaded motor. Through the arrangement of the preloaded motor, pre-tension can be applied to the sample between the winding rollers, and the operation of applying pre-tension is relatively convenient.

[0018] As a preferred embodiment, the driving component adopts a servo motor with constant speed mode. Through the arrangement of the servo motor, the sample can be stretched for testing at a constant speed, and the position of the sample on the sample carrier and the winding roller can be locked by braking the servo motor and synchronously locking the positions of the two transmission racks, so that the testing process is more reliable.

[0019] As a preferred embodiment, each first ratchet has a smooth tooth surface and a back connecting surface connected with the tooth surface. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present application, and are not a limitation on the present application.

[0021] Figure 1 is a schematic diagram of the overall structure of embodiment one;

[0022] Figure 2 is a schematic diagram of the side view structure of embodiment one, wherein the local enlargement a is shown;

[0023] Figure 3 is a schematic diagram of the bottom structure of embodiment one;

[0024] Figure 4is a top structure schematic diagram of example one, omitting the preloading motor and its related structure;

[0025] Figure 5 is Figure 4 is a cross-sectional schematic diagram of A-A part in the middle;

[0026] Figure 6 is Figure 4 is a cross-sectional schematic diagram of B-B part in the middle;

[0027] Figure 7 is a structure schematic diagram of prior art.

[0028] Reference signs:

[0029] machine table 1, support leg 11, upper guide slot 12, sample carrier 13, connecting part 131, balance sliding block 132, side sliding slot 133, scale bar 134, mounting vertical plate 14, winding roller 15, roller 151, clamping rod 152, preloading motor 153, connecting hole 16, lower guide slot 2, transmission rack 21, intermediate gear 22, brake motor 23, locking mechanism 3, first ratchet 31, mounting seat 32, telescopic column 33, first push spring 34, adjusting screw 35, preloaded bolt 351, limiting tooth 36, measurement guide frame 4, support bottom plate 5, lateral support mechanism 6, second ratchet 61, lateral support rod 62, limiting ratchet claw 63, connecting plate 64, second push spring 65, sample 8. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the present application will be further described in detail below with reference to the drawings. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present application.

[0031] It should be noted that: similar reference signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0032] Unless otherwise defined, technical terms or scientific terms used in the present patent document shall have the meanings as commonly understood by one of ordinary skill in the art to which the present patent document belongs. The terms "first", "second", and similar terms as used in the present patent document do not denote any order, quantity, or importance, but are used to distinguish one element from another. Also, the terms "one", "a", or "the" as used in the present patent document do not denote a quantity of particular element, but denote the existence of at least one of the particular element. The terms "comprise", "comprising", "include", "including", and the like as used in the present patent document specify the presence of the stated element or elements but do not preclude the presence or addition of one or more other elements. The terms "central", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are used to describe a relative position relationship, which can change when the absolute position of the described object changes, and are merely used to facilitate the description of the present patent document and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present patent document.

[0033] Some embodiments of the present patent document will be described in detail below with reference to the accompanying drawings. The features in the following examples can be combined with each other without conflict.

[0034] Example 1:

[0035] Referring to Figures 1 to 3 The present embodiment provides a non-woven fabric tensile strength testing device, which comprises a machine table 1 and a pair of sample carriers 13. The pair of sample carriers 13 are arranged on the machine table 1 in a manner that they can move relative to each other. Specifically, the bottom of the machine table 1 is provided with support legs 11, and the upper part of the machine table 1 is provided with an upper guide slot 12. The two sample carriers 13 are movably connected in the upper guide slot 12. Each sample carrier 13 is provided with a winding roller 15 for winding and fixing a sample 8. Specifically, each winding roller 15 comprises a roller cylinder 151 and a clamping rod 152 arranged on the roller cylinder 151. One end of the sample 8 is clamped and fixed on the roller cylinder 151 by the clamping rod 152. Each winding roller 15 is driven by a pre-tension motor 153. The pre-tension motor 153 is arranged to apply a pre-tension to the sample 8 between the winding rollers 15, so that the sample 8 can be in a straightened and tensioned state before stretching, avoiding idle stroke during the stretching test. The idle stroke refers to the state that the sample is not stretched when the carrier moves. The pre-tension motor 153 can be a servo motor with high positioning accuracy, which will not be described here.

[0036] Referring to Figure 3As shown, in the embodiment, the testing device further comprises a guiding mechanism, a driving component 23 and a locking mechanism 3. The guiding mechanism comprises a pair of transmission racks 21 and an intermediate gear 22 engaged with the pair of transmission racks 21. The pair of transmission racks 21 are movably arranged on the bottom of the machine table 1 and the moving directions of the two transmission racks 21 are opposite. The upper portions of the pair of transmission racks 21 are one-to-one connected to a pair of sample 8 carriers 13. The driving component 23 is adapted to drive the intermediate gear 22 to rotate at a constant speed. In use, the intermediate gear 22 is driven by the driving component 3 to rotate at a constant speed, thereby driving the transmission racks 21 on both sides to move, and further driving the sample carriers 13 connected with the transmission racks 21 to move towards the direction of stretching the sample. Compared with the ball screw transmission in the prior art, the gear and rack transmission has high positioning accuracy, and the general positioning accuracy can be below 0.1 mm. Therefore, the testing device can more accurately determine the position of the sample carrier 13, and further determine the stretching length of the sample.

[0037] Preferably, two opposite lower guide grooves 2 are arranged on the bottom of the machine table 1 along the width direction, each transmission rack 21 is connected in the corresponding lower guide groove 2, the machine table 1 is provided with connecting holes 16 opposite to the two transmission racks 21, respectively, and the bottom of each sample 8 carrier 13 has oppositely arranged connecting portions 131 and balance sliding blocks 132. The connecting portions 131 pass through the connecting holes 16 and connect the corresponding transmission racks 21. The two connecting holes 16 each have a side sliding groove 133 adapted to the corresponding balance sliding block 132. In this way, the sample carrier 13 can be more balanced and stable during the stretching movement.

[0038] The locking mechanism 3 comprises a plurality of first ratchets 31 arranged on the machine table 1 along the stretching direction and a limiting tooth 36 arranged on at least one transmission rack 21. In this embodiment, the limiting tooth 36 is arranged on both transmission racks 21. The limiting tooth 36 is configured to be elastically clamped into the gap between any two teeth of the plurality of first ratchets 31, so as to limit the movement of the at least one transmission rack 21 away from the stretching direction but allow the movement of the at least one transmission rack 21 toward the stretching direction. During the stretching of the sample 8 to the breaking peak, the two transmission racks 21 drive the limiting tooth 36 to move at a constant speed toward the stretching direction of the sample 8, so as to realize the constant speed stretching of the sample. After the stretching to a certain distance, the limiting tooth 36 is elastically clamped into the gap between the plurality of first ratchets 31. Since the first ratchets 31 limit the movement of the transmission rack 21 away from the stretching direction, the sample 8 is prevented from moving away from the stretching direction during the gradual stretching to the breaking peak. However, the movement of the transmission rack 21 toward the stretching direction is not limited, so as to not affect the stretching process. In addition, the rapid braking driving component 23 can timely limit the movement of the two transmission racks 21 toward the stretching direction at the moment of the breaking of the sample 8, so as to limit the continuous movement of the sample table 13 toward the stretching direction, i.e., the inertia forward movement. That is, the test device can effectively prevent the sample 8 from moving backward during the stretching to the breaking peak, and prevent the inertia forward movement of the sample 8 at the moment of the breaking, so as to accurately record the stretching position and the breaking position of the sample 8, and improve the accuracy of the breaking test.

[0039] Referring to Figure 2 and 6 as shown, Figure 2The locking mechanism 3 in the dashed portion shows the engagement state of the limiting tooth 36 and the first ratchet tooth 31 during the stretching of the test sample 8. Specifically, the locking mechanism 3 further comprises an inverted L-shaped mounting base 32, an extension column 33, and a first push spring 34. The top of the extension column 33 is connected to the mounting base 32. Specifically, the mounting base 32 has a longitudinal sliding groove, and the top of the extension column 33 is slidingly connected in the longitudinal sliding groove. The limiting tooth 36 is mounted at the bottom of the extension column 33. The bottom of the limiting tooth 36 is an inclined smooth slope to facilitate the limiting tooth 36 sliding over the tooth surface of the rear first ratchet tooth 31 and moving towards the stretching side. As preferred, each first ratchet tooth 31 has a smooth tooth surface and a back connecting surface connected to the tooth surface. The back connecting surface is used to limit the movement of the limiting tooth 36 towards the side away from the stretching, and the tooth surface allows the limiting tooth 36 to move towards the stretching side. The shape of the ratchet tooth is a conventional means in mechanical transmission, which is not described here. The first push spring 34 is connected between the limiting tooth 36 and the mounting base 32, and is adapted to push the limiting tooth 36 to engage in the tooth gap of the corresponding first ratchet tooth 31. The mounting base 32 is further provided with a threaded hole, and a pre-installed bolt 351 is arranged at the hole opening of the threaded hole. An adjusting screw 35 is arranged in the threaded hole through the pre-installed bolt 351. The head end of the adjusting screw 35 abuts against the extension column 33. By rotating the adjusting screw 35 to press the extension column 33 to move towards the side of the first ratchet tooth 31, the spring tension of the first push spring 34 can be adjusted, so that the limiting tooth 36 can more quickly engage the tooth gap of the corresponding first ratchet tooth 31. Before the test sample 8 is stretched for testing, the spring tension of the first push spring 34 is adjusted by the adjusting screw 35, so that the limiting tooth 36 can engage the first ratchet tooth 31, but cannot touch the outer surface of the lower guide groove 2. Then during the stretching of the test sample 8, the limiting tooth 36 continuously passes over or slides over the tooth surface of the first ratchet tooth 31 and then engages into the tooth gap of the first ratchet tooth 31, then passes over the tooth surface of another first ratchet tooth 31 and then engages into the tooth gap of the another first ratchet tooth 31, and the above process is repeated until the test sample 8 breaks, the limiting tooth 36 engages in the tooth gap of two first ratchet teeth 31, thereby preventing the back driving phenomenon of the transmission rack 21 connected with the limiting tooth 36 during the movement towards the stretching side, i.e., preventing the back driving phenomenon of the test sample 8 during the stretching to the breaking peak.

[0040] Reference Figure 1 、 2As shown, in the embodiment, each sample 8 loading stand 13 is provided with a mounting vertical plate 14 for mounting the corresponding winding roller 15, and the machine table 1 is provided with a measuring guide frame 4 along the stretching direction, the mounting vertical plate 14 is slidably connected in the measuring guide frame 4, and preferably, the measuring guide frame 4 is matched with the shape of the mounting vertical plate 14. The measuring guide frame 4 is provided with a scale along the length direction for measuring the stretching length of the sample 8, and each of the two sample loading stands 13 is provided with a scale bar 134 matched with the scale.

[0041] In order to solve the problem that the support rod of the testing device and the slider at the bottom thereof are easy to overturn as a whole when loading the sample in the prior art, with reference to Figure 4 、 5 , 6, in the embodiment, the testing device further comprises a lateral support mechanism 6, the lateral support mechanism 6 comprises a lateral support rod 62 and a plurality of second ratchets 61, each mounting vertical plate 14 is provided with a mounting recess, one end of the lateral support rod 62 is hinged on the mounting recess, and the lateral support rod 62 can be folded in the mounting recess as a whole, the other end of the lateral support rod 62 is provided with a limiting pawl 63, and the measuring guide frame 4 is provided with a plurality of second ratchets 61, the limiting pawl 63 is configured to be elastically clamped into the tooth gap of the plurality of second ratchets 61 to limit the movement of the lateral support rod 62 towards the side away from the stretching direction but allow the movement of the lateral support rod 62 towards the stretching direction. As Figure 5 shown by the dashed part, the limiting pawl 63 on the lateral support rod 6 is clamped into the tooth gap of the second ratchets 61, when the sample 8 is stretched to the peak of fracture, if the sample 8 drives the mounting vertical plate 14 to tilt towards the side away from the stretching direction, since the limiting pawl 63 is clamped into the tooth gap of the second ratchets 61, the mounting vertical plate 14, the lateral support rod 6 and the measuring guide frame 4 can form a stable triangular support structure, thereby balancing the excessive overturning moment to ensure the safety of the device. As preferred, the lateral support mechanism further comprises a second push spring 65, one side of the lateral support rod 62 is provided with a connecting plate 64, and the second push spring 65 is arranged between the corresponding mounting vertical plate 14 and the connecting plate 64, and the second push spring 65 is adapted to push the limiting pawl 63 to combine it in the tooth gap of the corresponding plurality of second ratchets 61.

[0042] In the embodiment, the driving component 23 adopts a servo motor with constant speed mode. Through the setting of the servo motor, the sample 8 can be stretched for testing at a constant speed, and at the same time, the position of the two transmission racks 21 can be locked synchronously by braking the servo motor, thereby locking the position of the sample loading stand 13 and the sample 8 on the winding roller 15, so that the testing process is more reliable.

[0043] In summary, in the above embodiment, the intermediate gear 22 is driven to rotate at a constant speed by the driving component 8, and in turn, the two transmission racks 21 are driven to move to the stretching side, and in turn, the stretching force is applied to the sample 8 by the winding roller 15 on the sample stage 13. On one hand, the constant speed stretching of the sample 8 can be realized, and by the locking mechanism composed of the limiting teeth 36 and the first plurality of ratchet teeth 31, the corresponding transmission rack 21 can be limited to move to the side away from the stretching side, and in turn, the sample 8 can be limited to move to the side away from the stretching side in the process of being gradually stretched to the breaking peak. In addition, the transmission rack 21 can be timely limited to move to the stretching side, and in turn, the sample stage 13 can be timely limited to move to the stretching side by the rapid braking of the driving component 23 at the moment of the breaking of the sample 8. That is, the testing device can effectively prevent the sample 8 from appearing the back-off phenomenon in the process of being stretched to the breaking peak, and at the same time, the inertia forward movement of the sample 8 at the moment of breaking can be prevented, that is, the stretching position and the breaking position of the sample 8 can be accurately recorded, and the accuracy of the breaking test is improved.

[0044] The above merely describes specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed by the present application can be easily thought by those skilled in the art, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A nonwoven fabric tensile strength testing apparatus comprising a table and a pair of sample stages arranged on the table in a manner capable of moving relative to each other, each of the sample stages being provided with a winding roller for winding a fixed sample, characterized in that, Also comprising: a guiding mechanism, which comprises a pair of transmission racks and an intermediate gear engaged with the pair of transmission racks; the pair of transmission racks are movably arranged on the bottom of the machine table and the moving directions of the two transmission racks are opposite, the upper parts of the pair of transmission racks are connected to the pair of sample tables in a one-to-one manner; a driving component adapted to drive the intermediate gear to rotate at a constant speed; and a locking mechanism, which comprises a plurality of first ratchets arranged on the machine table in the stretching direction and a limiting tooth arranged on at least one transmission rack, the limiting tooth is configured to be elastically clamped into the tooth gap of the plurality of first ratchets to limit the movement of the at least one transmission rack towards the side away from the stretching direction but allow its movement towards the stretching direction; each of the sample tables is provided with a mounting stand for mounting a corresponding winding roller, and a measuring guide frame is arranged on the machine table in the stretching direction; the mounting stand is slidably connected in the measuring guide frame; the lateral support mechanism comprises a lateral support rod and a plurality of second ratchets, one end of the lateral support rod is rotatably connected to the corresponding mounting stand, and the other end of the lateral support rod is provided with a limiting pawl; a plurality of second ratchets are arranged in the measuring guide frame, and the limiting pawl is configured to be elastically clamped into the tooth gap of the plurality of second ratchets to limit the movement of the lateral support rod towards the side away from the stretching direction but allow its movement towards the stretching direction; the lateral support mechanism further comprises a second push spring arranged between the corresponding mounting stand and the lateral support rod, and the second push spring is adapted to push the limiting pawl to combine it in the tooth gap of the corresponding plurality of second ratchets; the mounting stand, the lateral support rod and the measuring guide frame can form a stable triangular support structure.

2. The nonwoven tensile strength testing apparatus of claim 1, wherein, The locking mechanism further comprises a mounting seat, a telescopic column and a first push spring, the top of the telescopic column is connected to the mounting seat, the limiting tooth is mounted at the bottom of the telescopic column, and the first push spring is connected between the limiting tooth and the mounting seat, and the first push spring is adapted to push the limiting tooth to combine it in the tooth gap of the corresponding plurality of first ratchets.

3. The nonwoven tensile strength testing apparatus of claim 1, wherein, The bottom of each of the sample tables has oppositely arranged engaging parts and balance sliding blocks, the engaging parts are used to connect the corresponding transmission racks, and the machine table has side sliding grooves adapted to the corresponding balance sliding blocks.

4. The nonwoven tensile strength testing apparatus of claim 1, wherein, Each of the winding rollers is driven by a preloaded motor.

5. The nonwoven tensile strength testing apparatus of claim 1, wherein, The driving component adopts a servo motor with a constant speed mode.

6. The nonwoven tensile strength testing apparatus of claim 1, wherein, Each of the first ratchets has a smooth tooth surface and a back connecting surface connected to the tooth surface.

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