Zipper pull fatigue testing apparatus

Abstract

The utility model discloses a zip pull together fatigue test device, include: frame, be provided with panel and a plurality of trigger, and panel can show the trigger number of times of triggering, be connected with the first clamping component of frame, including the first upper clamping piece and first lower clamping piece that clamped first chain cloth upside and downside respectively, be connected with the second clamping component of frame, including the second upper clamping piece and second lower clamping piece that clamped second chain cloth upside and downside respectively, second upper clamping piece and second lower clamping piece, pull head, can reciprocating motion in vertical direction on frame, to reciprocating close and open the chain tooth of first chain cloth and second chain cloth, first upper clamping piece, first lower clamping piece, second upper clamping piece and second lower clamping piece are all elastically installed in frame, and can reciprocating displacement when chain tooth and close and open, to reciprocating trigger trigger. Accurate simulation zip real pull together action, direct monitoring open and close times, adapt to different chain cloth, ensure that test data is accurate and reliable.

Description

Technical Field

[0001] This utility model relates to the field of zipper performance testing technology, and in particular to a zipper opening and closing fatigue testing device. Background Technology

[0002] As a widely used closure component in modern industry and daily life, the reliability of zippers directly affects the user experience and safety of end products. Especially in fields such as clothing, bags, outdoor equipment, and aerospace equipment, zippers need to withstand frequent opening and closing operations over a long period of time. Therefore, strict requirements are placed on their opening and closing durability, the connection strength between the zipper fabric and the zipper teeth, the smoothness of the zipper pull movement, and the fatigue resistance of the overall structure.

[0003] Existing testing devices typically employ a mechanical drive structure to move the zipper head back and forth along the chain, enabling repeated opening and closing of the chain. However, on the one hand, such devices use a rigid clamping structure for the chain fabric. This not only fails to adapt to changes in chain fabric displacement, leading to additional friction or relative slippage between the chain fabric and the clamps during testing, but also masks early failures caused by chain fabric deformation in actual use, severely impacting the accuracy and reliability of the test results. On the other hand, most devices rely on counting the number of opening and closing cycles of the drive motor or actuator, rather than directly monitoring the actual opening and closing actions of the zipper. This results in discrepancies between the counted data and the actual number of opening and closing cycles in real-world usage scenarios, making it difficult to objectively reflect the zipper's lifespan. The aforementioned technical issues directly restrict the accuracy and effectiveness of zipper fatigue testing, making it difficult to use the test data as a reliable basis for evaluating the actual durability of zippers. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a zipper opening and closing fatigue testing device, which, through a linkage design of elastic clamping and trigger counting, accurately simulates the actual opening and closing action of a zipper, directly monitors the number of opening and closing cycles, adapts to different zipper fabrics, ensures accurate and reliable test data, and effectively evaluates the durability of the zipper.

[0005] The zipper opening and closing fatigue testing device according to an embodiment of the present invention includes: The base is equipped with a panel and several triggers, the panel being able to display the number of times the triggers are fired; A first clamping assembly is connected to the machine base. The first clamping assembly includes a first upper clamping block and a first lower clamping block, which clamp the upper and lower sides of the first chain cloth, respectively. The second clamping assembly is connected to the machine base. The second clamping assembly includes a second upper clamping block and a second lower clamping block, which clamp the upper and lower sides of the second chain cloth, respectively. The pull head can reciprocate vertically on the base to combine and open the chain teeth of the first chain and the second chain; The first upper clamping block, the first lower clamping block, the second upper clamping block, and the second lower clamping block are all elastically mounted on the machine base to repeatedly trigger the trigger.

[0006] The zipper opening and closing fatigue testing device according to the embodiments of this utility model has at least the following beneficial effects: by directly displaying the trigger number on the base panel, the zipper opening and closing action is converted into a quantifiable electrical signal count, avoiding the errors caused by indirect counting methods such as the number of times the drive motor runs, which are relied upon by traditional testing devices. This ensures that the test data directly reflects the opening and closing frequency of the zipper in actual use, significantly improving the correlation between the test results and real-world scenarios. Furthermore, the first upper clamping block, the first lower clamping block, the second upper clamping block, and the second lower clamping block all adopt an elastic installation method, enabling the clamping blocks to generate a counter-rotating inward displacement with the traction force of the zipper head when the zipper teeth are closed. The zipper rotates in the opposite direction to reset when the zipper teeth open. This dynamic displacement characteristic not only reproduces the real interaction process between the zipper and the clamping components during repeated opening and closing, but also directly triggers the trigger through the displacement of the clamping block, accurately converting the mechanical action into a counting signal. This ensures stable clamping of the zipper while achieving real-time monitoring and counting of the opening and closing actions, solving the problem of additional friction or loosening caused by the inability of traditional rigid clamping structures to adapt to the displacement of the zipper. Overall, it can not only accurately simulate the dynamic mechanical behavior of the zipper during the actual opening and closing process, but also directly and reliably obtain the number of triggers for the opening and closing actions, providing objective and accurate technical support for zipper durability assessment.

[0007] According to some embodiments of the zipper opening and closing fatigue testing device of this utility model, the base is equipped with a first tension spring and a second tension spring, the bottom ends of the first tension spring and the second tension spring are both fixed to the base; the first upper clamping block is rotatably disposed on the base, the top end of the first tension spring is connected to the first upper clamping block, so as to drive the first upper clamping block to rotate along the side away from the second zipper when the zipper teeth on the upper side of the first zipper are opened; the second upper clamping block is rotatably disposed on the base, the top end of the second tension spring is connected to the second upper clamping block, so as to drive the second upper clamping block to rotate along one side of the first zipper when the zipper teeth on the upper side of the second zipper are opened.

[0008] According to some embodiments of the present invention, in the zipper opening and closing fatigue testing device, when the zipper teeth on the upper side of the first zipper cloth and the second zipper cloth are closed, the first upper clamping block and the second upper clamping block rotate inward toward each other.

[0009] According to some embodiments of the present invention, the zipper opening and closing fatigue testing device is provided with a first steel wire connecting the first tension spring and the first upper clamping block. The base is provided with a first guide wheel. One end of the first steel wire is fixedly connected to the first upper clamping block, and the other end passes around the first guide wheel and extends downward in a vertical direction, and is fixedly connected to the top of the first tension spring.

[0010] According to some embodiments of the present invention, the zipper opening and closing fatigue testing device is provided with a second steel wire connecting the second tension spring and the second upper clamping block. The base is provided with a second guide wheel. One end of the second steel wire is fixedly connected to the second upper clamping block, and the other end passes around the second guide wheel and extends downward in a vertical direction, and is fixedly connected to the top of the second tension spring.

[0011] According to some embodiments of the zipper opening and closing fatigue testing device of this utility model, a first follower seat is fixedly connected to the middle of the first steel wire, and a second follower seat is fixedly connected to the middle of the second steel wire. There are two triggers, and the two triggers are respectively arranged in one-to-one correspondence with the first follower seat and the second follower seat. The first follower seat moves up and down under the drive of the first steel wire to trigger the corresponding trigger. The second follower seat moves up and down under the drive of the second steel wire to trigger the corresponding trigger.

[0012] According to some embodiments of the zipper opening and closing fatigue testing device of this utility model, the base is equipped with a third tension spring and a fourth tension spring, the bottom ends of the third tension spring and the fourth tension spring are fixed to the base, the first lower clamping block is rotatably disposed on the base, the top end of the third tension spring is connected to the first lower clamping block so as to drive the first lower clamping block to rotate along the side away from the second zipper when the zipper teeth on the lower side of the first zipper are opened; the second lower clamping block is rotatably disposed on the base, the top end of the fourth tension spring is connected to the second lower clamping block so as to drive the second lower clamping block to rotate along one side of the first zipper when the zipper teeth on the lower side of the second zipper are opened.

[0013] According to some embodiments of the present invention, in the zipper opening and closing fatigue testing device, when the zipper teeth on the lower side of the first zipper cloth and the second zipper cloth are closed, the first lower clamping block and the second lower clamping block rotate inward toward each other.

[0014] According to some embodiments of the present invention, the zipper opening and closing fatigue testing device is provided with a first upper clamping groove, which allows the first chain cloth to extend into. The first upper clamping block is threadedly connected to a first screw connector to screw into the first upper clamping groove and press the first chain cloth.

[0015] According to some embodiments of the present invention, the zipper opening and closing fatigue testing device is provided with a base equipped with a drive motor, a lead screw and a lead screw nut that are connected in sequence. The lead screw is arranged vertically, and the zipper head is slidably disposed on the base in the vertical direction. The lead screw nut is fixedly connected to the zipper head to drive the zipper head to move in the vertical direction.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the zipper zipping fatigue testing device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the clamping structure of the first upper clamping block of the zipper opening and closing fatigue testing device according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the drive structure of the zipper pull fatigue testing device according to an embodiment of the present invention.

[0018] Explanation of icon numbers: Base 100; Panel 110; Trigger 120; First guide wheel 130; Second guide wheel 140; Drive motor 150; Lead screw 151; Lead screw nut 152; First upper clamping block 210; first upper clamping groove 2101; first screw connector 211; first lower clamping block 220; first steel wire 230; first follower seat 231; Second upper clamping block 310; second lower clamping block 320; second steel wire 330; second follower seat 331; First tension spring 410; Second tension spring 420; Third tension spring 430; Fourth tension spring 440; First chain fabric 510; Second chain fabric 520; Slipper head 530; Chain teeth 540. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0020] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0022] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0023] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0024] As a widely used closure component in modern industry and daily life, the reliability of zippers directly affects the user experience and safety of end products. Especially in fields such as clothing, bags, outdoor equipment, and aerospace equipment, zippers need to withstand frequent opening and closing operations over a long period of time. Therefore, strict requirements are placed on their opening and closing durability, the connection strength between the zipper fabric and the zipper teeth, the smoothness of the zipper pull movement, and the fatigue resistance of the overall structure.

[0025] Existing testing devices typically employ a mechanical drive structure to move the zipper head back and forth along the chain, enabling repeated opening and closing of the chain. However, on the one hand, such devices use a rigid clamping structure for the chain fabric. This not only fails to adapt to changes in chain fabric displacement, leading to additional friction or relative slippage between the chain fabric and the clamps during testing, but also masks early failures caused by chain fabric deformation in actual use, severely impacting the accuracy and reliability of the test results. On the other hand, most devices rely on counting the number of opening and closing cycles of the drive motor or actuator, rather than directly monitoring the actual opening and closing actions of the zipper. This results in discrepancies between the counted data and the actual number of opening and closing cycles in real-world usage scenarios, making it difficult to objectively reflect the zipper's lifespan. The aforementioned technical issues directly restrict the accuracy and effectiveness of zipper fatigue testing, making it difficult to use the test data as a reliable basis for evaluating the actual durability of zippers.

[0026] Therefore, such as Figures 1 to 3As shown, the zipper opening and closing fatigue testing device proposed in this utility model includes a base 100, a first clamping assembly connected to the base 100, a second clamping assembly connected to the base 100, and a zipper head 530 capable of reciprocating vertically on the base 100. The first clamping assembly includes a first upper clamping block 210 and a first lower clamping block 220, which clamp the upper and lower sides of the first chain fabric 510, respectively. Similarly, the second clamping assembly includes a second upper clamping block 310 and a second lower clamping block 320, which clamp the upper and lower sides of the second chain fabric 520, respectively. Furthermore, the zipper head 530 reciprocates to close and open the chain teeth 540 of the first and second chain fabrics 510 and 520. Furthermore, the base 100 is provided with a panel 110 and several triggers 120. The panel 110 can display the number of times the triggers 120 are triggered. In addition, the first upper clamping block 210, the first lower clamping block 220, the second upper clamping block 310 and the second lower clamping block 320 are all elastically mounted on the base 100 to repeatedly trigger the triggers 120. It should be noted that by directly displaying the trigger count of the trigger 120 on the panel 110 of the base 100, the zipper opening and closing action is converted into a quantifiable electrical signal count. This avoids the errors caused by indirect counting methods such as the number of times the drive motor 150 rotates, which are relied upon by traditional testing devices. This ensures that the test data directly reflects the opening and closing frequency of the zipper in actual use, significantly improving the correlation between the test results and real-world scenarios. Furthermore, the first upper clamping block 210, the first lower clamping block 220, the second upper clamping block 310, and the second lower clamping block 320 all adopt a flexible installation method, allowing the clamping blocks to generate a coordinated inward rotational displacement in response to the traction force of the zipper head 530 when the zipper teeth 540 close. When the chain tooth 540 is opened, it rotates in the opposite direction to reset. This dynamic displacement characteristic not only reproduces the real interaction process between the zipper and the clamping component during repeated opening and closing, but also directly triggers the trigger 120 through the displacement of the clamping block, accurately converting the mechanical action into a counting signal. This ensures stable clamping of the chain while realizing real-time monitoring and counting of the opening and closing action, solving the problem of additional friction or loosening caused by the inability of traditional rigid clamping structures to adapt to the displacement of the chain. Overall, it can not only accurately simulate the dynamic mechanical behavior of the zipper during the actual opening and closing process, but also directly and reliably obtain the number of triggers for the opening and closing action, providing objective and accurate technical support for zipper durability assessment.

[0027] The elastic mounting structure of the first upper clamping block 210 and the second upper clamping block 310 is achieved by tension springs. Specifically, refer to... Figure 1In some embodiments of this utility model, the base 100 is equipped with a first tension spring 410 and a second tension spring 420, the bottom ends of the first tension spring 410 and the second tension spring 420 are both fixed to the base 100; a first upper clamping block 210 is rotatably disposed on the base 100, the top end of the first tension spring 410 is connected to the first upper clamping block 210 so as to drive the first upper clamping block 210 to rotate along the side away from the second chain cloth 520 when the chain teeth 540 on the upper side of the first chain cloth 510 are opened; a second upper clamping block 310 is rotatably disposed on the base 100, the top end of the second tension spring 420 is connected to the second upper clamping block 310 so as to drive the second upper clamping block 310 to rotate along one side of the first chain cloth 510 when the chain teeth 540 on the upper side of the second chain cloth 520 are opened. In application, when the upper teeth 540 of the first chain fabric 510 and the second chain fabric 520 are closed, the first upper clamping block 210 and the second upper clamping block 310 rotate inwards towards each other, which can accurately reproduce the mechanical process of the upper chain teeth 540 of the chain fabric coming together and meshing tightly during the zipper opening and closing process. Furthermore, the first tension spring 410 and the first upper clamping block 210 are connected by a first steel wire 230. The base 100 is provided with a first guide wheel 130. One end of the first steel wire 230 is fixedly connected to the first upper clamping block 210, and the other end passes around the first guide wheel 130 and extends downwards in a vertical direction, and is fixedly connected to the top of the first tension spring 410. This optimizes the force transmission path between the first tension spring 410 and the first upper clamping block 210, and solves the problem of inaccurate rotation of the clamping block or delay in trigger signal that may be caused by the direct action of elastic force. Similarly, in some embodiments of this utility model, the second tension spring 420 and the second upper clamping block 310 are connected by a second steel wire 330. The base 100 is provided with a second guide wheel 140. One end of the second steel wire 330 is fixedly connected to the second upper clamping block 310, and the other end passes around the second guide wheel 140 and extends downward in a vertical direction, and is fixedly connected to the top of the second tension spring 420. This also optimizes the force transmission path between the second tension spring 420 and the second upper clamping block 310. Furthermore, through the symmetrical transmission design, the coordinated movement control of the clamping blocks on the upper side of the first chain cloth 510 and the second chain cloth 520 is achieved.

[0028] In some embodiments of this utility model, the trigger 120 is mechanically triggered, such as... Figure 1As shown, a first follower seat 231 is fixedly connected to the middle of the first steel wire 230, and a second follower seat 331 is fixedly connected to the middle of the second steel wire 330. There are two triggers 120, which are arranged one-to-one with the first follower seat 231 and the second follower seat 331, respectively. The first follower seat 231 moves up and down under the drive of the first steel wire 230 to trigger the corresponding trigger 120, and the second follower seat 331 moves up and down under the drive of the second steel wire 330 to trigger the corresponding trigger 120. This accurately converts the displacement change of the clamping block into an electrical signal to trigger counting. Simultaneously, the two triggers 120 correspond one-to-one with the follower seats on the upper side of the chain fabric on both sides, realizing independent monitoring and synchronous counting of the opening and closing actions of the upper chain fabric. This provides a key guarantee for the integrity and reliability of the test data, significantly improves the device's ability to simulate actual zipper usage scenarios, and ensures a strict correspondence between the count data and the actual number of opening and closing operations.

[0029] Similar to the first upper clamping block 210 and the second upper clamping block 310, the elastic mounting structure of the first lower clamping block 220 and the second lower clamping block 320 is also achieved by tension springs. (Refer to...) Figure 1 In some embodiments of this utility model, the base 100 is equipped with a third tension spring 430 and a fourth tension spring 440. The bottom ends of the third tension spring 430 and the fourth tension spring 440 are fixed to the base 100. The first lower clamping block 220 is rotatably disposed on the base 100. The top end of the third tension spring 430 is connected to the first lower clamping block 220 so as to drive the first lower clamping block 220 to rotate along the side away from the second chain cloth 520 when the chain teeth 540 on the lower side of the first chain cloth 510 are opened. Similarly, the second lower clamping block 320 is rotatably disposed on the base 100. The top end of the fourth tension spring 440 is connected to the second lower clamping block 320 so as to drive the second lower clamping block 320 to rotate along the side of the first chain cloth 510 when the chain teeth 540 on the lower side of the second chain cloth 520 are opened. Understandably, the elastic restoring force of the third tension spring 430 and the fourth tension spring 440 accurately simulates the force changes on the lower side of the zipper fabric during the opening and closing process, avoiding the problems of restricted displacement or stress concentration on the lower side of the zipper fabric caused by rigid clamping. Simultaneously, in synergy with the dynamic characteristics of the first upper clamping block 210 and the second upper clamping block 310 on the upper side, they jointly reproduce the true mechanical state of the entire zipper chain during the opening and closing cycle. This provides key structural support for the comprehensiveness and reliability of the test data, significantly improving the device's ability to simulate the overall opening and closing performance of the zipper and ensuring the coordinated realism of the force state of the entire zipper fabric. In application, when closing the zipper teeth 540 on the lower side of the first zipper fabric 510 and the second zipper fabric 520, the first lower clamping block 220 and the second lower clamping block 320 rotate inwards towards each other, accurately simulating the mechanical process of the zipper teeth 540 on the lower side of the zipper fabric meshing during the opening and closing process.

[0030] Refer to Figure 2In some embodiments of this utility model, the first upper clamping block 210 is provided with a first upper clamping groove 2101, into which the first chain cloth 510 can extend. The first upper clamping block 210 is threadedly connected to a first screw connector 211, which screws into the first upper clamping groove 2101 and presses the first chain cloth 510, thus solving the problem of adapting to chain cloths of different thicknesses. It can be understood that the first upper clamping groove 2101 provides a precise positioning space for the upper first chain cloth 510. By rotating the first screw connector 211, its screwing depth can be adjusted, thereby changing the clamping force on the first chain cloth 510, ensuring that the first chain cloth 510 is firmly fixed and undamaged during testing. Furthermore, this design not only simplifies the installation operation of the first chain cloth 510, but also achieves precise control of the clamping force of the first chain cloth 510 through threaded adjustment, avoiding deformation or local stress concentration of the first chain cloth 510 caused by rigid clamping. It should be noted that the clamping structure of the second upper clamping block 310, the first lower clamping block 220 and the second lower clamping block 320 on the chain cloth can refer to the clamping structure of the first upper clamping block 210 mentioned above, and will not be described in detail here.

[0031] Refer to Figure 3 In some embodiments of this utility model, the base 100 is provided with a drive motor 150, a lead screw 151, and a lead screw nut 152 connected in sequence. The lead screw 151 is arranged vertically, and the zipper head 530 is slidably disposed on the base 100 in the vertical direction. The lead screw nut 152 is fixedly connected to the zipper head 530 to drive the zipper head 530 to move in the vertical direction. The high transmission precision of the motor, lead screw 151, and lead screw nut 152 mechanism ensures the smoothness and repeatability of the zipper head 530's movement, avoiding deviations in the zipper opening and closing action caused by vibration or backlash in the drive mechanism. This provides a stable and reliable power input for zipper opening and closing fatigue testing, significantly improving the consistency of the testing device's action and testing efficiency.

[0032] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A zipper zipping fatigue testing device, characterized in that, include: The base is equipped with a panel and several triggers, the panel being able to display the number of times the triggers are fired; A first clamping assembly is connected to the machine base. The first clamping assembly includes a first upper clamping block and a first lower clamping block, which clamp the upper and lower sides of the first chain cloth, respectively. The second clamping assembly is connected to the machine base. The second clamping assembly includes a second upper clamping block and a second lower clamping block, which clamp the upper and lower sides of the second chain cloth, respectively. The pull head can reciprocate vertically on the base to combine and open the chain teeth of the first chain and the second chain; The first upper clamping block, the first lower clamping block, the second upper clamping block, and the second lower clamping block are all elastically mounted on the machine base to repeatedly trigger the trigger.

2. The zipper zipping fatigue testing device according to claim 1, characterized in that: The base is equipped with a first tension spring and a second tension spring, the bottom ends of which are fixed to the base. A first upper clamping block is rotatably mounted on the base, and the top end of the first tension spring is connected to the first upper clamping block so as to drive the first upper clamping block to rotate along the side away from the second chain cloth when the chain teeth on the upper side of the first chain cloth are opened. A second upper clamping block is rotatably mounted on the base, and the top end of the second tension spring is connected to the second upper clamping block so as to drive the second upper clamping block to rotate along one side of the first chain cloth when the chain teeth on the upper side of the second chain cloth are opened.

3. The zipper zipping fatigue testing device according to claim 2, characterized in that: When the chain teeth on the upper sides of the first and second chain fabrics are closed, the first and second upper clamping blocks rotate inwards towards each other.

4. The zipper zipping fatigue testing device according to claim 2, characterized in that: The first tension spring and the first upper clamping block are connected by a first steel wire. The machine base is provided with a first guide wheel. One end of the first steel wire is fixedly connected to the first upper clamping block, and the other end passes around the first guide wheel and extends downward in a vertical direction, and is fixedly connected to the top of the first tension spring.

5. The zipper zipping fatigue testing device according to claim 4, characterized in that: The second tension spring and the second upper clamping block are connected by a second steel wire. The base is provided with a second guide wheel. One end of the second steel wire is fixedly connected to the second upper clamping block, and the other end passes around the second guide wheel and extends downward in a vertical direction, and is fixedly connected to the top of the second tension spring.

6. The zipper zipping fatigue testing device according to claim 5, characterized in that: A first follower seat is fixedly connected to the middle of the first steel wire, and a second follower seat is fixedly connected to the middle of the second steel wire. There are two triggers, which are respectively arranged in one-to-one correspondence with the first follower seat and the second follower seat. The first follower seat moves up and down under the drive of the first steel wire to trigger the corresponding trigger. The second follower seat moves up and down under the drive of the second steel wire to trigger the corresponding trigger.

7. The zipper zipping fatigue testing device according to claim 1, characterized in that: The base is equipped with a third tension spring and a fourth tension spring, the bottom ends of which are fixed to the base. The first lower clamping block is rotatably mounted on the base, and the top end of the third tension spring is connected to the first lower clamping block so as to drive the first lower clamping block to rotate along the side away from the second chain cloth when the chain teeth on the lower side of the first chain cloth are opened. The second lower clamping block is rotatably mounted on the base, and the top end of the fourth tension spring is connected to the second lower clamping block so as to drive the second lower clamping block to rotate along one side of the first chain cloth when the chain teeth on the lower side of the second chain cloth are opened.

8. The zipper zipping fatigue testing device according to claim 7, characterized in that: When the chain teeth on the lower sides of the first and second chain fabrics are closed, the first and second lower clamping blocks rotate inwards towards each other.

9. The zipper zipping fatigue testing device according to claim 1, characterized in that: The first upper clamping block is provided with a first upper clamping groove, which allows the first chain cloth to extend into. The first upper clamping block is threadedly connected to a first screw connector to screw into the first upper clamping groove and press the first chain cloth.

10. The zipper zipping fatigue testing device according to claim 1, characterized in that: The base is provided with a drive motor, a lead screw and a lead screw nut that are connected in sequence. The lead screw is arranged vertically, and the pull head is slidably disposed on the base in the vertical direction. The lead screw nut is fixedly connected to the pull head to drive the pull head to move in the vertical direction.

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