Tension strength testing equipment for polyester yarn
By introducing a dual tensile mechanism and clamping components into the polyester yarn testing equipment, and combining it with a servo motor drive to simulate yarn torsion, the problem that existing equipment cannot fully reflect the yarn torsion force is solved, and high-precision tensile testing is achieved.
Patent Information
- Application Number
- CN202511951496.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-23
- Publication Date
- 2026-03-13
AI Technical Summary
Existing polyester yarn tensile strength testing equipment cannot fully reflect the strength of the yarn during the twisting process, and the clamps are prone to shifting, resulting in inaccurate testing.
A testing device including first and second stretching mechanisms is designed, equipped with first and second clamping components and a rotating component. The yarn ends are clamped by cylinders, and the yarn twisting is simulated by a servo motor. The clamping surface is adjusted to match the yarn diameter by a limit wheel and a stud to ensure stability and accuracy.
It enables comprehensive testing of polyester yarn under complex stress conditions, improving testing accuracy and stability. It can simulate torsion conditions in actual use, ensuring accurate clamping and tensile force measurement of yarn at different diameters.
Smart Images
Figure CN121656009A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of polyester yarn production technology, and in particular to a tensile strength testing device for polyester yarn. Background Technology
[0002] Polyester yarn, as a synthetic fiber, is widely used in textiles, apparel, home textiles, industrial filter cloths, and medical and health fields due to its excellent strength, elasticity, abrasion resistance, and chemical corrosion resistance. In the production and application of polyester yarn, tensile strength is one of the key indicators for measuring its product quality and performance. Polyester yarn with insufficient tensile strength is prone to breakage and excessive tensile deformation during subsequent processing or use, which not only affects production efficiency but also seriously reduces the quality and service life of the final product.
[0003] Some existing tensile strength testing devices use clamps to hold both ends of polyester yarn and apply tension to measure its tensile strength. However, polyester yarn is twisted during daily use, so axial tensile testing alone cannot fully reflect the tensile strength of polyester yarn, and existing clamps are prone to misalignment during use. Summary of the Invention
[0004] To address the problems mentioned in the background art, the present invention provides a tensile strength testing device for polyester yarn.
[0005] The present invention provides a tensile strength testing device for polyester yarn, which adopts the following technical solution:
[0006] A tensile strength testing device for polyester yarn includes a workbench with a digital display tensile gauge mounted on it. A drive mechanism, a first tensioning mechanism, and a second tensioning mechanism are sequentially mounted on the top of the workbench. The first tensioning mechanism includes a first clamping assembly and a first rotating assembly. The first tensioning mechanism includes a lower support plate mounted on the top of the workbench. A first rotating shaft is rotatably mounted within a shaft hole on the lower support plate. A lower tensioning frame is mounted at the other end of the first rotating shaft. A first driven gear is mounted on the first rotating shaft. The first clamping assembly includes symmetrical first cylinders fixedly mounted at both ends of the lower tensioning frame. The output end of each first cylinder is connected to a first mounting plate. The first mounting plate has symmetrical guide rods. One end of each guide rod slides within guide holes on the side walls at both ends of the lower tensioning frame. The other side of the first mounting plate has symmetrical... A first T-shaped groove, inside which a first T-shaped block is installed, and a first arc-shaped clamping block is connected to one side of the first T-shaped block. The inner arc surface of the first arc-shaped clamping block is provided with protruding teeth. A first fixing post is also installed on the inner wall of the lower tension frame. A first limiting wheel is sleeved on the first fixing post. The first limiting wheel is evenly provided with toothed grooves. The middle part of the first limiting wheel is also provided with a first limiting groove in the middle of the toothed grooves. A fixing component for fixing the first limiting wheel is also provided on the first fixing post. The fixing component includes a first fixing ring installed on the first fixing post on one side of the first limiting wheel. A plurality of first studs are installed on the first fixing ring. One end of the first stud passes through a fixing hole opened on the first limiting wheel. The first limiting ring is installed on the other side of the first limiting wheel at one end of the first stud. A first nut is also provided at one end of the first stud.
[0007] The first rotating assembly includes a first servo motor installed in a slot at the bottom of the lower support plate and the top of the worktable. The output end of the first servo motor passes through a shaft hole provided on the lower support plate and is connected to a first drive gear. The first drive gear meshes with a first driven gear installed on a first rotating shaft on the lower support plate.
[0008] Preferably, the second stretching mechanism is provided with a second clamping assembly and a second rotating assembly. The second stretching mechanism includes an upper stretching frame installed on the top of the lower stretching frame. The top of the upper stretching frame is connected to a second rotating shaft. The other end of the second rotating shaft is rotatably installed in a shaft hole provided on the upper support plate. A second driven gear is installed on the second rotating shaft.
[0009] Preferably, the second clamping assembly includes symmetrical second cylinders fixedly installed at both ends of the upper tension frame. The output end of the second cylinder is connected to a second mounting plate. A symmetrical guide rod is provided on one side of the second mounting plate. One end of the guide rod slides in the guide hole provided on the side wall of both ends of the upper tension frame. A symmetrical second T-shaped groove is opened on the other side of the second mounting plate. A second T-shaped block is installed inside the second T-shaped groove. A second arc-shaped clamping block is connected to one side of the second T-shaped block. The inner arc surface of the second arc-shaped clamping block is provided with protruding teeth. A second fixing post is also installed on the inner wall of the upper tension frame. A second limiting wheel is sleeved on the second fixing post. The second limiting wheel is evenly provided with tooth grooves. The middle part of the second limiting wheel is located in the middle of the tooth groove and is also provided with a second limiting groove.
[0010] Preferably, the second fixing post is further provided with a fixing component for fixing the second limiting wheel. The fixing component includes a second fixing ring installed on the second fixing post on one side of the second limiting wheel. A plurality of second studs are installed on the second fixing ring. One end of the second stud passes through a fixing hole opened on the second limiting wheel. The second limiting ring is installed on the other side of the second limiting wheel at one end of the second stud. A second nut is also provided at one end of the second stud.
[0011] Preferably, the second rotating component includes a second servo motor mounted on the top of the upper support plate. The output end of the second servo motor passes through a shaft hole provided on the upper support plate and is connected to a second driving gear. The second driving gear meshes with a second driven gear mounted on a first rotating shaft inside the shaft hole on the upper support plate.
[0012] Preferably, the driving mechanism includes a support frame mounted on the top of the workbench, a drive motor mounted on the top of the support frame, an output end of the drive motor connected to one end of a lead screw disposed inside the support frame, the other end of the lead screw connected to a bearing seat disposed at the bottom of the support frame, a movable seat adapted to be mounted on the lead screw, symmetrical sliding blocks mounted at both ends of the movable seat, the sliding blocks sliding on sliding rods mounted at the openings on both sides of the support frame, a connecting rod also connected to one side of the movable seat, the other end of the connecting rod passing through a sliding groove opened on the front side of the support frame and connected to one side of the upper support plate.
[0013] In summary, the present invention has the following beneficial technical effects:
[0014] 1. This invention comprises a first stretching mechanism and a second stretching mechanism. The first stretching mechanism includes a first clamping component and a first rotating component, while the second stretching mechanism includes a second clamping component and a second rotating component. A first cylinder in the first clamping component drives a first arc-shaped clamping block to clamp and fix one end of the polyester yarn. A second cylinder in the second clamping component drives a second arc-shaped clamping block to clamp and fix the other end of the polyester yarn. Simultaneously, a first servo motor in the first rotating component enables the yarn to rotate in the opposite direction, and a second servo motor in the second rotating component enables the yarn to rotate in the forward direction, thereby achieving twisting at both ends of the yarn. This simulates the twisting conditions in actual use, allowing for comprehensive testing of the tensile strength of the yarn under complex stress conditions.
[0015] 2. When testing polyester yarns of different diameters, this invention loosens the first nut and the second nut, causing the first limiting ring to move out along the first stud axial direction and the second limiting ring to move out along the second stud axial direction. This allows the first limiting wheel to move out along the first fixed post axial direction and the second limiting wheel to move out along the second fixed post axial direction. Then, the first limiting wheel and the second limiting wheel of different specifications are replaced to match the first limiting groove on the first limiting wheel and the second limiting groove on the second limiting wheel with the diameter of the polyester yarn. Subsequently, the first arc-shaped clamping block is moved to slide along the first T-shaped groove and the second arc-shaped clamping block is moved along the second T-shaped groove, allowing them to be moved out and replaced with the first arc-shaped clamping block and the second arc-shaped clamping block of the corresponding specifications. This ensures that the clamping surface is in close contact with the outer diameter of the yarn, thereby improving the stability of clamping and the accuracy of testing. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of a tensile strength testing device for polyester yarn in an embodiment of the present invention;
[0017] Figure 2 This is a schematic diagram of the first tensioning mechanism in an embodiment of the present invention;
[0018] Figure 3 This is a schematic diagram of the lower tension frame structure in an embodiment of the present invention;
[0019] Figure 4 This is a structural exploded view of the first clamping component in an embodiment of the present invention;
[0020] Figure 5 This is a split view of the first limiting wheel structure in an embodiment of the present invention;
[0021] Figure 6 This is a schematic diagram of the second tensioning mechanism in an embodiment of the present invention;
[0022] Figure 7 This is a structural exploded view of the second clamping component in an embodiment of the present invention;
[0023] Figure 8This is a split view of the second limiting wheel structure in an embodiment of the present invention;
[0024] Figure 9 This is a schematic diagram of the drive mechanism structure in an embodiment of the present invention.
[0025] Explanation of reference numerals in the attached drawings: 1. Workbench; 2. Digital display force gauge; 3. Lower support plate; 4. Lower tension frame; 5. First driven gear; 6. First cylinder; 7. First mounting plate; 8. First T-slot; 9. First T-block; 10. First arc-shaped clamping block; 11. First fixing post; 12. First limiting wheel; 13. First limiting groove; 14. First fixing ring; 15. First stud; 16. First limiting ring; 17. First nut; 18. First servo motor; 19. First driving gear; 20. Upper support plate; 21. Upper tension frame; 2 2. Second driven gear; 23. Second cylinder; 24. Second mounting plate; 25. Second T-slot; 26. Second T-block; 27. Second arc-shaped clamping block; 28. Second fixed post; 29. Second limiting wheel; 30. Second limiting groove; 31. Second fixing ring; 32. Second stud; 33. Second limiting ring; 34. Second nut; 35. Second servo motor; 36. Second driving gear; 37. Support frame; 38. Drive motor; 39. Lead screw; 40. Movable seat; 41. Sliding block; 42. Sliding rod; 43. Connecting rod. Detailed Implementation
[0026] The following is in conjunction with the appendix Figure 1-9 The present invention will be described in further detail below.
[0027] This invention discloses a tensile strength testing device for polyester yarn, comprising a workbench 1, on which a digital display tensile gauge 2 is mounted. A drive mechanism, a first tensioning mechanism, and a second tensioning mechanism are sequentially mounted on the top of the workbench 1. The first tensioning mechanism includes a first clamping assembly and a first rotating assembly. The first tensioning mechanism includes a lower support plate 3 mounted on the top of the workbench 1. A first rotating shaft is rotatably mounted within a shaft hole on the lower support plate 3. A lower tensioning frame 4 is mounted at the other end of the first rotating shaft. A first driven gear 5 is mounted on the first rotating shaft. The first clamping assembly includes symmetrical first cylinders 6 fixedly mounted at both ends of the lower tensioning frame 4. The output end of the first cylinder 6 is connected to a first... Mounting plate 7 has symmetrical guide rods on one side, with one end of each guide rod sliding within guide holes on the side walls of the lower tension frame 4. The other side of the mounting plate 7 has symmetrical first T-shaped grooves 8, inside which a first T-shaped block 9 is installed. A first arc-shaped clamping block 10 is connected to one side of the first T-shaped block 9, and the inner arc surface of the first arc-shaped clamping block 10 has protruding teeth. A first fixing post 11 is also installed on the inner wall of the lower tension frame 4. A first limiting wheel 12 is fitted onto the first fixing post 11, and the first limiting wheel 12 has evenly spaced toothed grooves. A first limiting groove 13 is also formed in the middle of the toothed grooves on the first limiting wheel 12. The first fixing post 11 also has a first limiting groove 13. The fixing assembly for fixing the limiting wheel 12 includes a first fixing ring 14 mounted on the first fixing post 11 on one side of the first limiting wheel 12. A plurality of first studs 15 are mounted on the first fixing ring 14. One end of each stud 15 passes through a fixing hole in the first limiting wheel 12, and the other end of each stud 15 is mounted on the other side of the first limiting wheel 12, along with a first limiting ring 16. A first nut 17 is also provided at one end of each stud 15. More specifically, by driving the first cylinders 6 mounted at both ends of the lower tension frame 4, the first mounting plate 7 is moved towards the center, causing the protruding teeth on the inner arc surface of the first arc-shaped clamping block 10 to mesh with the tooth grooves on the first limiting wheel 12 on the first fixing post 11. This clamps one end of the polyester yarn, preventing slippage during testing and ensuring accurate force transmission. When testing polyester yarns of different diameters, the first nut 17 is loosened, causing the first limiting ring 16 to move out along the first stud 15 axially. This allows the first limiting wheel 12 to move out along the first fixed post 11 axially. Then, the first limiting wheel 12 of different specifications is replaced, ensuring that the first limiting groove 13 on the first limiting wheel 12 matches the diameter of the polyester yarn. Simultaneously, the first arc-shaped clamping block 10 is moved and slid along the first T-shaped groove 8, allowing it to be replaced with a first arc-shaped clamping block 10 of the corresponding specification. This ensures that the clamping surface fits tightly against the outer diameter of the yarn, thereby improving clamping stability and testing accuracy.
[0028] refer to Figure 2The first rotating component includes a first servo motor 18 installed in a slot at the bottom of the lower support plate 3 and the top of the worktable 1. The output end of the first servo motor 18 passes through a shaft hole provided on the lower support plate 3 and is connected to a first driving gear 19. The first driving gear 19 meshes with a first driven gear 5 installed on a first rotating shaft on the lower support plate 3. More specifically, the first servo motor 18 drives the first driving gear 19 to rotate in the forward direction, thereby driving the first driven gear 5 to rotate in the reverse direction, so that the first rotating shaft together with the lower tension frame 4 rotates in the reverse direction, thereby driving the polyester yarn to rotate synchronously and realizing the accurate testing of the yarn torsion performance.
[0029] refer to Figure 6 , Figure 7 and Figure 8The second stretching mechanism includes a second clamping assembly and a second rotating assembly. The second stretching mechanism includes an upper stretching frame 21 mounted on top of the lower stretching frame 4. A second rotating shaft is connected to the top of the upper stretching frame 21, and the other end of the second rotating shaft is rotatably mounted in a shaft hole on the upper support plate 20. A second driven gear 22 is mounted on the second rotating shaft. The second clamping assembly includes symmetrical second cylinders 23 fixedly mounted at both ends of the upper stretching frame 21. The output end of the second cylinder 23 is connected to a second mounting plate 24. Symmetrical guide rods are provided on one side of the second mounting plate 24, and one end of each guide rod slides in guide holes provided on the side walls at both ends of the upper stretching frame 21. On the other side of 24, a symmetrical second T-shaped groove 25 is provided. A second T-shaped block 26 is installed inside the second T-shaped groove 25. A second arc-shaped clamping block 27 is connected to one side of the second T-shaped block 26. The inner arc surface of the second arc-shaped clamping block 27 is provided with protruding teeth. A second fixing post 28 is also installed on the inner wall of the upper tension frame 21. A second limiting wheel 29 is sleeved on the second fixing post 28. The second limiting wheel 29 is evenly provided with toothed grooves. A second limiting groove 30 is also provided in the middle of the toothed grooves of the second limiting wheel 29. A fixing component for fixing the second limiting wheel 29 is also provided on the second fixing post 28. The fixing component includes the second limiting wheel 29 located on the second fixing post 28. A second fixing ring 31 is installed on one side of the positioning wheel 29. Several second studs 32 are mounted on the second fixing ring 31. One end of each second stud 32 passes through a fixing hole in the second positioning wheel 29. A second limiting ring 33 is installed on the other side of the second limiting wheel 29 at one end of the second stud 32. A second nut 34 is also provided at one end of each second stud 32. More specifically, by driving the second cylinders 23 installed at both ends of the upper tension frame 21, the second mounting plate 24 is moved towards the center, causing the protruding teeth on the inner arc surface of the second arc-shaped clamping block 27 to mesh with the tooth grooves on the second limiting wheel 29 of the second fixing post 28, thereby clamping the other end of the polyester yarn and preventing the yarn from splitting. During the test, one end slips to ensure the accuracy of tensile force transmission. When testing polyester yarns of different diameters, the second nut 34 is loosened, causing the second limiting ring 33 to move out along the second stud 32 axially. This allows the second limiting wheel 29 to move out along the second fixed post 28 axially. Then, the second limiting wheel 29 of different specifications is replaced to match the second limiting groove 30 on the second limiting wheel 29 with the diameter of the polyester yarn. At the same time, the second arc-shaped clamping block 27 is moved to slide along the second T-shaped groove 25. After it moves out, the corresponding specification of the second arc-shaped clamping block 27 is replaced to ensure that the clamping surface fits tightly with the outer diameter of the yarn, thereby improving the stability of clamping and the accuracy of testing.
[0030] refer to Figure 6The second rotating component includes a second servo motor 35 mounted on the top of the upper support plate 20. The output end of the second servo motor 35 passes through a shaft hole provided on the upper support plate 20 and is connected to a second drive gear 36. The second drive gear 36 meshes with a second driven gear 22 mounted on a first rotating shaft inside the shaft hole of the upper support plate 20. More specifically, driving the second servo motor 35 to reverse reverse drives the second drive gear 36 to rotate in the opposite direction, thereby driving the second driven gear 22 to rotate in the forward direction, so that the second rotating shaft together with the upper tension frame 21 rotates in the forward direction, thereby driving the polyester yarn to rotate synchronously, and realizing the accurate testing of the yarn torsion performance.
[0031] refer to Figure 1 and Figure 9 The drive mechanism includes a support frame 37 mounted on the top of the workbench 1. A drive motor 38 is mounted on the top of the support frame 37. The output end of the drive motor 38 is connected to one end of a lead screw 39 disposed inside the support frame 37. The other end of the lead screw 39 is connected to a bearing seat disposed at the bottom of the support frame 37. A movable seat 40 is fitted onto the lead screw 39. Symmetrical sliding blocks 41 are mounted at both ends of the movable seat 40. The sliding blocks 41 slide on sliding rods 42 mounted at the openings on both sides of the support frame 37. A connecting rod 43 is also connected to one side of the movable seat 40. The other end of the connecting rod 43 passes through... The support frame 37 has a sliding groove on its front side, which is connected to one side of the upper support plate 20. More specifically, the drive motor 38 drives the lead screw 39 to rotate, causing the movable seat 40 to move up and down along the slide rod 42 via the sliding blocks 41 installed at both ends. This causes the connecting rod 43 connected to one side of the movable seat 40 to drive the upper support plate 20 to rise and fall synchronously, thereby adjusting the relative position of the upper tension frame 21 and the lower tension frame 4. This allows for precise control of the tensile tension of the polyester yarn, ensuring that the yarn is subjected to uniform force during the stretching process and avoiding fiber breakage or uneven elongation caused by tension fluctuations.
[0032] The implementation principle of the tensile strength testing device for polyester yarn according to an embodiment of the present invention is as follows: During use, the polyester yarn is wound into the first limiting groove 13 on the first limiting wheel 12 of the lower tension frame 4 and the second limiting groove 30 on the second limiting wheel 29 of the upper tension frame 21. Simultaneously, the first cylinder 6 and the second cylinder 23 are driven. The first cylinder 6 moves the first mounting plate 7 towards the center, causing the protruding teeth on the inner arc surface of the first arc-shaped clamping block 10 to mesh with the tooth grooves on the first limiting wheel 12, thereby clamping one end of the polyester yarn and preventing slippage during the test. The second cylinder 23 moves the second mounting plate 24 towards the center. The movement causes the protruding teeth on the inner surface of the second arc-shaped clamping block 27 to mesh with the tooth grooves on the second limiting wheel 29, thereby clamping the other end of the polyester yarn and ensuring that both ends of the yarn are firmly fixed. Then, the drive motor 38 is started, and the height of the upper tensioning frame 21 is adjusted through the cooperation of the lead screw 39 and the movable seat 40, thereby stretching the polyester yarn. The tension is counted by observing the digital display tension gauge 2. Then, the first servo motor 18 is started to drive the first drive gear 19 to rotate forward. Through meshing with the first driven gear 5, the lower tensioning frame 4 drives one end of the yarn to move synchronously, realizing the reverse rotation of the yarn. At the same time, the first servo motor 18 drives the first drive gear 19 to rotate forward. The second servo motor 35 drives the second active gear 36 to rotate in the opposite direction. Through meshing with the second driven gear 22, it drives the upper tension frame 21 to rotate synchronously, realizing the forward rotation of the yarn. This achieves the twisting of both ends of the yarn, simulating the torsion condition in actual use. This allows for comprehensive testing of the strength and deformation performance of the yarn under complex stress conditions. When testing polyester yarns of different diameters, loosening the first nut 17 and the second nut 34 causes the first limiting ring 16 to move out along the axial direction of the first stud 15, and the second limiting ring 33 to move out along the axial direction of the second stud 32. This allows the first limiting wheel 12 to move along the first fixed... The column 11 is moved out axially, and the second limiting wheel 29 is moved out axially along the second fixed column 28. Then, the first limiting wheel 12 and the second limiting wheel 29 of different specifications are replaced so that the first limiting groove 13 on the first limiting wheel 12 and the second limiting groove 30 on the second limiting wheel 29 match the diameter of the polyester yarn. Then, the first arc-shaped clamping block 10 is moved to slide along the first T-shaped groove 8, and the second arc-shaped clamping block 27 is moved along the second T-shaped groove 25 so that the corresponding first arc-shaped clamping block 10 and the second arc-shaped clamping block 27 are replaced to ensure that the clamping surface fits tightly with the outer diameter of the yarn, thereby improving the stability of clamping and the accuracy of testing.
[0033] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.
Claims
1. A tensile strength testing device for polyester yarn, comprising a workbench (1), wherein a digital display tensile gauge (2) is mounted on the workbench (1), characterized in that: The top of the workbench (1) is sequentially equipped with a drive mechanism, a first tensioning mechanism, and a second tensioning mechanism. The first tensioning mechanism includes a first clamping assembly and a first rotating assembly. The first tensioning mechanism includes a lower support plate (3) installed on the top of the workbench (1). A first rotating shaft is rotatably installed in the shaft hole provided on the lower support plate (3). A lower tensioning frame (4) is installed at the other end of the first rotating shaft. A first driven gear (5) is installed on the first rotating shaft. The first clamping assembly includes symmetrical first cylinders (6) fixedly installed at both ends of the lower tensioning frame (4). The output end of the first cylinder (6) is connected to a first mounting plate (7). A symmetrical guide rod is provided on one side of the first mounting plate (7). One end of the guide rod slides in the guide hole provided on the side wall of both ends of the lower tensioning frame (4). A symmetrical first T-shaped groove (8) is opened on the other side of the first mounting plate (7). A first T-shaped block (9) is installed inside the first T-shaped groove (8). A first T-shaped block (9) is connected to one side of the first T-shaped block (9). An arc-shaped clamping block (10) is provided with protruding teeth on its inner arc surface. A first fixing post (11) is also installed on the inner wall of the lower tension frame (4). A first limiting wheel (12) is sleeved on the first fixing post (11). The first limiting wheel (12) is evenly provided with tooth grooves. A first limiting groove (13) is also provided in the middle of the tooth grooves in the first limiting wheel (12). A fixing assembly for fixing the first limiting wheel (12) is also provided on the first fixing post (11). The fixing component includes a first fixing ring (14) installed on the first fixing post (11) on one side of the first limiting wheel (12). A plurality of first studs (15) are installed on the first fixing ring (14). One end of the first stud (15) passes through a fixing hole opened on the first limiting wheel (12). One end of the first stud (15) is located on the other side of the first limiting wheel (12) and a first limiting ring (16) is installed. A first nut (17) is also provided at one end of the first stud (15). The first rotating assembly includes a first servo motor (18) installed in a slot at the bottom of the lower support plate (3) and the top of the worktable (1). The output end of the first servo motor (18) passes through a shaft hole provided on the lower support plate (3) and is connected to a first driving gear (19). The first driving gear (19) meshes with a first driven gear (5) installed on a first rotating shaft on the lower support plate (3).
2. The tensile strength testing device for polyester yarn according to claim 1, characterized in that: The second stretching mechanism is provided with a second clamping component and a second rotating component. The second stretching mechanism includes an upper stretching frame (21) installed on the top of the lower stretching frame (4). The top of the upper stretching frame (21) is connected to a second rotating shaft. The other end of the second rotating shaft is rotatably installed in a shaft hole provided on the upper support plate (20). A second driven gear (22) is installed on the second rotating shaft.
3. The tensile strength testing device for polyester yarn according to claim 2, characterized in that: The second clamping assembly includes symmetrical second cylinders (23) fixedly installed at both ends of the upper tension frame (21). The output end of the second cylinder (23) is connected to a second mounting plate (24). A symmetrical guide rod is provided on one side of the second mounting plate (24). One end of the guide rod slides in the guide hole provided on the side wall of both ends of the upper tension frame (21). A symmetrical second T-shaped groove (25) is provided on the other side of the second mounting plate (24). A second T-shaped block (26) is installed inside the second T-shaped groove (25). A second arc-shaped clamping block (27) is connected to one side of the second T-shaped block (26). The inner arc surface of the second arc-shaped clamping block (27) is provided with protruding teeth. A second fixing column (28) is also installed on the inner wall of the upper tension frame (21). A second limiting wheel (29) is sleeved on the second fixing column (28). The second limiting wheel (29) is evenly provided with tooth grooves. The middle part of the second limiting wheel (29) is located in the middle of the tooth groove and a second limiting groove (30) is also provided.
4. The tensile strength testing device for polyester yarn according to claim 3, characterized in that: The second fixing post (28) is also provided with a fixing component for fixing the second limiting wheel (29). The fixing component includes a second fixing ring (31) installed on the second fixing post (28) on one side of the second limiting wheel (29). A plurality of second studs (32) are installed on the second fixing ring (31). One end of the second stud (32) passes through a fixing hole opened on the second limiting wheel (29). One end of the second stud (32) is located on the other side of the second limiting wheel (29) and a second limiting ring (33) is installed. A second nut (34) is also provided at one end of the second stud (32).
5. The tensile strength testing device for polyester yarn according to claim 2, characterized in that: The second rotating component includes a second servo motor (35) mounted on the top of the upper support plate (20). The output end of the second servo motor (35) passes through a shaft hole provided on the upper support plate (20) and is connected to a second drive gear (36). The second drive gear (36) meshes with a second driven gear (22) mounted on a first rotating shaft inside the shaft hole of the upper support plate (20).
6. The tensile strength testing device for polyester yarn according to claim 1, characterized in that: The drive mechanism includes a support frame (37) installed on the top of the workbench (1). A drive motor (38) is installed on the top of the support frame (37). The output end of the drive motor (38) is connected to one end of a lead screw (39) provided inside the support frame (37). The other end of the lead screw (39) is connected to a bearing seat provided at the bottom of the support frame (37). A movable seat (40) is fitted on the lead screw (39). Symmetrical sliding blocks (41) are installed at both ends of the movable seat (40). The sliding blocks (41) slide on sliding rods (42) installed at the openings on both sides of the support frame (37). A connecting rod (43) is also connected to one side of the movable seat (40). The other end of the connecting rod (43) passes through a sliding groove opened on the front side of the support frame (37) and is connected to one side of the upper support plate (20).