Tensile force adjustment mechanism-equipped human cotton yarn preparation tensile detection device and method

Abstract

The application discloses a tensile detection device and method for human cotton yarn preparation with a tension adjusting mechanism, and relates to the technical field of yarn detection. The fixed box is provided with a rack, the rack is slidably connected with a cross beam, the fixed box is provided with a lifting mechanism for lifting the cross beam, the cross beam is connected with a top clamping assembly through a tension sensor, a bottom clamping assembly is connected to the fixed box, and the top and bottom clamping assemblies are symmetrically arranged, the clamping assembly comprises a guide rail, a servo motor and a round rod are arranged on the guide rail, yarns are spirally wound on the round rod at both ends, and are clamped through clamping plates, compared with the existing ordinary flat clamping, the clamping area of the yarns at both ends is increased, the anti-sliding effect is good, and the detection result accuracy is improved.

Description

Technical Field

[0001] This invention relates to the field of yarn testing technology, specifically to a tensile strength testing device and method for preparing rayon yarn with a tension adjustment mechanism. Background Technology

[0002] Rayon yarn is a regenerated cellulose fiber yarn spun from viscose. It is named for its plant-derived raw material and properties similar to cotton. This yarn is produced through processes such as alkalization, aging, and sulfonation to create soluble cellulose xanthate, followed by wet spinning. It possesses physical properties such as a moisture content of 8-10%, superior hygroscopicity compared to cotton, and no odor when burned. During production, batches of yarn are randomly sampled for tensile strength testing. If the test is successful, the entire batch is released; otherwise, the process is investigated, rework is required, or the yarn is scrapped.

[0003] Existing yarn tensile strength testing technologies, such as the device for testing the tensile strength of textile yarn disclosed in patent announcement number CN223940684U, can detect the tensile strength of textile yarn by setting up a control host, electric actuator, tension sensor, and clamps. However, the area of ​​the yarn held by the clamps on both sides is too small, causing the yarn to easily slide on the clamps during the pulling test, resulting in inaccurate test results. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a tensile strength testing device and method for preparing rayon yarn with a tension adjustment mechanism, thus solving the problems existing in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a tensile strength testing device for rayon yarn preparation with a tension adjustment mechanism, comprising a fixed box, a frame mounted on the fixed box, a crossbeam slidably connected to the frame, a lifting mechanism for raising and lowering the crossbeam mounted on the fixed box, the crossbeam being connected to a top clamping assembly via a tension sensor, and a bottom clamping assembly being connected to the fixed box, with the upper and lower clamping assemblies symmetrically arranged. Each clamping assembly includes a guide rail, on which a servo motor and a round rod are mounted. The output end of the servo motor is connected to a bidirectional lead screw, and both ends of the bidirectional lead screw are screwed with sliding rods slidably connected to the guide rail. The two sliding rods are respectively connected to clamping plates one and two via miniature pressure sensors, with the round rod located between clamping plates one and two. During testing, both ends of the yarn are spirally wound onto the upper and lower round rods and clamped by clamping plates one and two. The top guide rail is connected to the tension sensor, and the bottom guide rail is connected to the fixed box.

[0006] Preferably, the clamping plate is provided with an arc-shaped groove and a plurality of spiral break grooves, wherein the spiral break groove at the rear end is connected to the arc-shaped groove, and a clearance groove is provided on the side of the rear end of the clamping plate, which is used to avoid the vertical detection section of the yarn. An arc-shaped strip is provided in the arc-shaped groove, and a spiral break strip is provided in the spiral break groove.

[0007] Preferably, the round rod is further provided with an arc-shaped groove II and a spiral groove communicating with the arc-shaped groove II, and the front end of the spiral groove extends to the front side of the clamping plate I and the clamping plate II. The round rod is also provided with a groove communicating with the front end of the spiral groove. The front end of the round rod is also provided with a button. An arc-shaped strip II is provided in the arc-shaped groove II, and a spiral strip is provided in the spiral groove.

[0008] Preferably, the clamping plate 2 is provided with an arc-shaped groove 3 and a plurality of spiral broken grooves 2, an arc-shaped strip 3 is provided in the arc-shaped groove 3, and a spiral broken strip 2 is provided in each of the spiral broken grooves 2.

[0009] Preferably, the cross-sections of the arc groove one, spiral broken groove one, arc groove two, spiral groove, arc groove three, spiral broken groove two, arc strip one, spiral broken strip one, arc strip two, spiral strip, arc strip three, and spiral broken strip two are all V-shaped structures, and the arc strip one, spiral broken strip one, arc strip two, spiral strip, arc strip three, and spiral broken strip two are all anti-slip rubber strips.

[0010] Preferably, a guide rod penetrating the crossbeam is provided on the top guide rail, and guide posts penetrating the slide rod are provided on both the first clamping plate and the second clamping plate.

[0011] Preferably, the lifting mechanism includes a second servo motor installed in a fixed box. The output end of the second servo motor is connected to a lead screw, and a crossbeam is screwed onto the lead screw. A controller is installed inside the fixed box, and an operation display screen and operation buttons are installed on the outside of the fixed box. The operation display screen, operation buttons, tension sensor, first servo motor, second servo motor, miniature pressure sensor, and buttons are all electrically connected to the controller.

[0012] A method for using a tensile strength testing device for preparing rayon yarn with a tension adjustment mechanism, the method comprising the following steps: Step 1: Cut a standard length of yarn from the yarn bobbin, spirally wind one end of the yarn onto the round rod, and then drive the bidirectional lead screw to rotate, which in turn drives the slide bars on both sides to move, so that the miniature pressure sensors drive the clamping plates one and two to move toward the opposite side to clamp the spiral yarn on the round rod. Step 2: After pulling the other end of the yarn taut, spirally wind it onto the other round rod, and then clamp it using clamp plate one and clamp plate two; Step 3: Move the lifting mechanism to move the crossbeam upward, which stretches the yarn. The tension sensor detects the change in tension. When the yarn breaks, check the magnitude of the tension to determine whether the yarn's tensile strength is up to standard. Repeat the above steps to check the yarn on multiple yarn bobbins for judgment.

[0013] This invention provides a tensile strength testing device and method for preparing rayon yarn with a tension adjustment mechanism. Compared with the prior art, it has the following advantages: 1. The tensile strength testing device and method for preparing rayon yarn with a tension adjustment mechanism is described. The two ends of the yarn are spirally wound on a round rod and clamped by clamping plate 1 and clamping plate 2. Compared with the existing ordinary flat clamping, the clamping area of ​​the two ends of the yarn is increased, the anti-slip effect is better, and thus the accuracy of the test results is improved.

[0014] 2. The tensile strength testing device and method for preparing rayon yarn with a tension adjustment mechanism is provided with an arc-shaped groove 1, a spiral break groove 1, an arc-shaped groove 2, a spiral groove, an arc-shaped groove 3, a spiral break groove 2, and a clearance groove. This allows the yarn to be spirally embedded and wound through the spiral break groove 1, the spiral groove, and the spiral break groove 2 when the two ends of the yarn are spirally wound. It also allows the yarn to be circumferentially embedded and wound through the arc-shaped groove 1, the arc-shaped groove 2, the arc-shaped groove 3, and the clearance groove. This ensures that the testing section is in a vertical state and prevents the yarn from slipping along the axial direction of the round rod. As a result, the greater the tension, the tighter the binding, further improving the anti-slip effect.

[0015] 3. The tensile strength testing device and method for preparing rayon yarn with a tension adjustment mechanism is equipped with an arc-shaped strip I, a spiral broken strip I, an arc-shaped strip II, a spiral strip, an arc-shaped strip III, and a spiral broken strip II made of anti-slip rubber strips, which can further improve the anti-slip effect at both ends of the yarn.

[0016] 4. The tensile strength testing device and method for preparing rayon yarn with tension adjustment mechanism, wherein the cross-sections of arc groove one, spiral broken groove one, arc groove two, spiral groove, arc groove three, spiral broken groove two, arc strip one, spiral broken strip one, arc strip two, spiral strip, arc strip three and spiral broken strip two are all V-shaped structures. The V-shaped cross-section can ensure that it can be embedded and tightened to accommodate different yarn thicknesses.

[0017] 5. The tensile strength testing device and method for preparing rayon yarn with a tension adjustment mechanism, wherein one end of the yarn is pulled out after being tightly wound through a groove connected to the spiral groove, which makes it easy for the user to keep the yarn tightly wound on the spiral groove. Then, the user can press the button to make the controller operate the servo motor, so that the user can operate the device by one person. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2This is a schematic diagram of the clamping assembly of the present invention; Figure 3 This is a schematic diagram of the round rod, clamping plate one, and clamping plate two of the present invention; Figure 4 This is a schematic diagram of the clamping plate of the present invention; Figure 5 This is a schematic diagram of the second clamping plate of the present invention; Figure 6 This is a schematic diagram of the groove and button of the present invention; Figure 7 This is a schematic diagram of the clearance groove of the present invention.

[0019] In the diagram: 1. Fixed box; 2. Frame; 3. Crossbeam; 4. Tension sensor; 6. Guide rod; 5. Clamping assembly; 51. Guide rail; 52. Servo motor 1; 53. Slide rod; 54. Guide post; 55. Miniature pressure sensor; 56. Clamping plate 1; 561. Arc groove 1; 562. Spiral broken groove 1; 563. Clearance groove; 564. Arc strip 1; 565. Spiral broken strip 1; 57. Round rod; 571. Arc groove II; 572. Spiral groove; 573. Groove; 574. Button; 575. Arc strip II; 576. Spiral strip; 58. Clamping plate II; 581. Arc groove III; 582. Spiral broken groove II; 583. Arc strip III; 584. Spiral broken strip II. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] See Figures 1-7 The present invention provides the following two technical solutions: First embodiment: Tensile strength testing device for rayon yarn preparation with tension adjustment mechanism, including a fixed box 1, a frame 2 mounted on the fixed box 1, and a crossbeam 3 slidably connected to the frame 2.

[0022] The fixed box 1 is equipped with a lifting mechanism for raising and lowering the crossbeam 3. The crossbeam 3 is connected to the top clamping assembly 5 through the tension sensor 4. The bottom clamping assembly 5 is connected to the fixed box 1, and the upper and lower clamping assemblies 5 are symmetrically arranged.

[0023] Both ends of the yarn are clamped by clamping components 5 on both sides. The lifting mechanism drives the crossbeam 3 to rise, which stretches the yarn. The tension is detected by the tension sensor 4.

[0024] The clamping assembly 5 includes a guide rail 51, on which a servo motor 52 and a round rod 57 are mounted. The output end of the servo motor 52 is connected to a bidirectional lead screw, and both ends of the bidirectional lead screw are screwed with slide rods 53 that are slidably connected to the guide rail 51. The servo motor 52 is connected to the bidirectional lead screw through a reducer to control the rotation speed, and then drives the slide rods 53 on both sides to move in opposite directions. The two sliding rods 53 are connected to clamping plate 1 56 and clamping plate 2 58 respectively through miniature pressure sensors 55, and the round rod 57 is located between clamping plate 1 56 and clamping plate 2 58. The distance between clamping plate 1 56 and clamping plate 2 58 and the round rod 57 is different when clamping yarns of different thicknesses. Therefore, the purpose of using miniature pressure sensors 55 is to detect the clamping pressure. When the clamping pressure is reached, clamping can be stopped to facilitate clamping yarns of different thicknesses.

[0025] During testing, the two ends of the yarn are spirally wound around the upper and lower round rods 57 respectively, and are clamped by clamping plate 1 56 and clamping plate 2 58. The top guide rail 51 is connected to the tension sensor 4, and the bottom guide rail 51 is connected to the fixed box 1.

[0026] Compared to existing ordinary flat clamps, this increases the clamping area at both ends of the yarn, resulting in better anti-slip performance and thus improving the accuracy of test results.

[0027] Even with helical winding, the yarn may still slip along the axis of the round rod 57, and it is difficult to ensure that the yarn detection end remains vertical, which will affect the tensile test results.

[0028] Therefore, an arc-shaped groove 561 and several spiral break grooves 562 are provided on the clamping plate 56. The spiral break groove 562 at the rear end is connected to the arc-shaped groove 561. The purpose is to allow the yarn to bypass the arc-shaped groove 561 and enter the spiral break groove 562. Then, the arc-shaped groove 561 and several spiral break grooves 562 are used to be nested on the outside of the yarn.

[0029] In order to ensure that the vertical detection end of the yarn is not obstructed when it extends, a clearance groove 563 is provided on the side of the rear end of the clamp 56, and the clearance groove 563 is used to avoid the vertical detection section of the yarn.

[0030] The round rod 57 is also provided with an arc-shaped groove 571 and a spiral groove 572 connected to the arc-shaped groove 571, so that the yarn can enter the spiral groove 572 through the arc-shaped groove 571.

[0031] The front end of the round rod 57 is also equipped with a button 574, which is used by the subsequent controller to control the servo motor 52 to work, so that the clamping plate 56 and the clamping plate 58 move relative to each other to clamp the yarn, so that the user can operate the device by one person.

[0032] However, after the yarn is pulled out, if the button 574 is far from the front and back of the clamping plates 56 and 58, it is difficult to operate with one hand to keep the yarn taut in the spiral groove 572 while pressing the button 574 with the thumb. This can easily cause the yarn to come off the spiral groove 572. If the button 574 is close to the front and back of the clamping plates 56 and 58, it is possible to pull the yarn taut with one hand and press the button 574, but it is easy to get your hand pinched by the clamping plates 56 and 58.

[0033] Therefore, the front end of the spiral groove 572 extends to the front side of the clamping plate 1 56 and clamping plate 2 58, so that the button 574 is far away from the clamping plate 1 56 and clamping plate 2 58, and can still be tightened by one hand through the forward extension of the spiral groove 572, so as to press the button 574.

[0034] If the front part of the spiral groove 572 is tightened, it would be difficult to guarantee the tightening effect if the groove is not opened further. Therefore, a groove 573 communicating with the front end of the spiral groove 572 is also opened on the round rod 57, so that the yarn can be drawn out through the groove 573 when tightening.

[0035] The clamping plate 2 58 has an arc-shaped groove 3 581 and several spiral grooves 2 582, all of which are used to be nested on the outside of the yarn.

[0036] To improve the anti-slip effect, an arc-shaped strip 564 is provided in the arc-shaped groove 561, and a spiral broken strip 565 is provided in the spiral broken groove 562; an arc-shaped strip 575 is provided in the arc-shaped groove 571, and a spiral strip 576 is provided in the spiral groove 572; an arc-shaped strip 583 is provided in the arc-shaped groove 581, and a spiral broken strip 584 is provided in each of the spiral broken grooves 582. Among them, the arc-shaped strip 564, the spiral broken strip 565, the arc-shaped strip 575, the spiral strip 576, the arc-shaped strip 583, and the spiral broken strip 584 are all anti-slip rubber strips.

[0037] In order to accommodate the nesting of yarns of different thicknesses, the cross-sections of the arc groove 1 561, spiral broken groove 1 562, arc groove 2 571, spiral groove 572, arc groove 3 581, spiral broken groove 2 582, arc strip 1 564, spiral broken strip 1 565, arc strip 2 575, spiral strip 576, arc strip 3 583, and spiral broken strip 2 584 are all V-shaped.

[0038] The lifting mechanism includes a second servo motor installed in the fixed box 1. The second servo motor is also connected to the output end through a reducer, and then connected to a lead screw. A crossbeam 3 is screwed onto the lead screw. In this way, the second servo motor drives the lead screw to rotate, thereby driving the crossbeam 3 to rise and fall.

[0039] Both servo motor 1 (52) and servo motor 2 have built-in encoders. A controller is installed inside the fixed box 1, and an operation display screen and operation buttons are installed on the outside of the fixed box 1. The operation display screen, operation buttons, tension sensor 4, servo motor 1 (52), servo motor 2, miniature pressure sensor 55, and button 574 are all electrically connected to the controller. The electrical connection is made by cable connection, which can supply power and transmit signals. The power supply adopts existing technology, that is, powering the controller through a plug can supply power to the electrical components mentioned in the text.

[0040] Each panel of the fixed box 1 is detachable and is equipped with a heat dissipation mesh for heat dissipation. It also has an opening on the rear side for cable connection to the internal controller.

[0041] Controller model: Siemens S7-1500; Operation display model: KTP400 Basic PN; Servo motor model: Siemens V90 series; Tension sensor 4 model: DYLY-103; Miniature pressure sensor 55 model: Burster 8402.

[0042] There are at least two buttons 574: one is a start compression button and the other is a stop button. The required program is programmed into the controller through the operation display screen. When it is necessary to clamp the yarn, press the start compression button. The controller controls the servo motor 52 to work and clamp. The miniature pressure sensor 55 transmits the pressure signal to the controller for processing. When the pressure is detected, the controller controls the servo motor 52 to stop working. The stop button can also be used to stop in case of emergency or if you want to stop in the middle.

[0043] After clamping, the controller operates the button to make the servo motor 2 work, causing the lead screw to drive the crossbeam 3 to rise for detection. The tension sensor 4 transmits the tension signal to the controller for processing. When a sudden drop in tension is detected, the controller starts to stop the servo motor 2. At the same time, the maximum tension data and the distance the crossbeam 3 moved at that time are displayed on the operation screen. The distance the crossbeam 3 moved can be calculated by the encoder of the servo motor 2. For example, the number of millimeters the lead screw advances for one revolution of the motor is fixed. Therefore, the distance the crossbeam 3 moves can be converted by counting with the encoder. When it stops, the controller controls the servo motor 52 to work according to the program to release the two ends of the yarn.

[0044] To improve stability and prevent torsion, a second implementation method is provided. The main difference between this method and the first implementation method is that a guide rod 6 that passes through the crossbeam 3 is provided on the top guide rail 51, and guide posts 54 that pass through the slide rod 53 are provided on both the first clamping plate 56 and the second clamping plate 58. In this way, the connection is not only connected by the tension sensor 4 and the miniature pressure sensor 55, but also guided by the above-mentioned guide structure to avoid tilting caused by forces from other directions.

[0045] The method for testing the tensile strength of rayon yarn prepared with a tension adjustment mechanism, using the tensile strength testing device for rayon yarn prepared with a tension adjustment mechanism in the second embodiment, includes the following steps: Step 1: Cut a standard length of yarn from the yarn bobbin, spirally wind one end of the yarn onto the round rod 57, and then drive the bidirectional lead screw to rotate, thereby moving the slide bars 53 on both sides, so that the miniature pressure sensor 55 drives the clamping plate 56 and clamping plate 58 to move towards the opposite side to clamp the spiral yarn on the round rod 57. Step 2: After pulling the other end of the yarn taut, it is also spirally wound onto the other round rod 57, and then clamped by clamp plate 56 and clamp plate 58. Step 3: Move the lifting mechanism to move the crossbeam 3 upward, so that the yarn is stretched. The tension sensor 4 detects the change in tension. When the yarn breaks, check the magnitude of the tension to determine whether the yarn's tensile strength is up to standard. Repeat the above steps to repeatedly test the yarn on multiple yarn bobbins for judgment. In the above steps, such as Figure 3 As shown, the unlabeled structure on the left is yarn. The yarn end is pulled and extended through arc groove 2 571, spiral groove 572, and groove 573. When clamped from above and below, arc groove 1 561, spiral broken groove 1 562, arc groove 3 581, and spiral broken groove 2 582 nest and wrap the yarn. It is also wrapped with anti-slip by arc strip 1 564, spiral broken strip 1 565, arc strip 2 575, spiral strip 576, arc strip 3 583, and spiral broken strip 2 584. This makes the yarn first circumferentially wound and then spirally wound. The circumferential winding makes the yarn keep the detection section in a vertical state after passing through the avoidance groove 563. The spiral winding increases the clamping area and adopts embedded wrapping to improve the anti-slip ability along the axial direction of the round rod 57 so that it can be pulled tighter and tighter.

[0046] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0047] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tensile strength testing device for preparing rayon yarn with a tension adjustment mechanism, comprising a fixed box (1), a frame (2) mounted on the fixed box (1), a crossbeam (3) slidably connected to the frame (2), a lifting mechanism for raising and lowering the crossbeam (3) mounted on the fixed box (1), the crossbeam (3) being connected to a top clamping assembly (5) via a tension sensor (4), and a bottom clamping assembly (5) being connected to the fixed box (1), wherein the upper and lower clamping assemblies (5) are symmetrically arranged, characterized in that: The clamping assembly (5) includes a guide rail (51), on which a servo motor (52) and a round rod (57) are provided. The output end of the servo motor (52) is connected to a bidirectional lead screw, and both ends of the bidirectional lead screw are screwed with slide rods (53) that are slidably connected to the guide rail (51). The two slide rods (53) are connected to clamping plate (56) and clamping plate (58) respectively through a miniature pressure sensor (55). The round rod (57) is located between clamping plate (56) and clamping plate (58). During detection, the two ends of the yarn are spirally wound on the upper and lower round rods (57) respectively, and clamped by clamping plate (56) and clamping plate (58). The top guide rail (51) is connected to the tension sensor (4), and the bottom guide rail (51) is connected to the fixed box (1).

2. The tensile strength testing device for preparing rayon yarn with a tension adjustment mechanism according to claim 1, characterized in that: The clamping plate (56) is provided with an arc-shaped groove (561) and several spiral break grooves (562), wherein the spiral break groove (562) at the rear end is connected to the arc-shaped groove (561), and a clearance groove (563) is provided on the side of the rear end of the clamping plate (56), and the clearance groove (563) is used to avoid the vertical detection section of the yarn. An arc-shaped strip (564) is provided in the arc-shaped groove (561), and a spiral break strip (565) is provided in the spiral break groove (562).

3. The tensile strength testing device for preparing rayon yarn with a tension adjustment mechanism according to claim 2, characterized in that: The round rod (57) is also provided with an arc groove two (571) and a spiral groove (572) communicating with the arc groove two (571). The front end of the spiral groove (572) extends to the front side of the clamping plate one (56) and the clamping plate two (58). The round rod (57) is also provided with a groove (573) communicating with the front end of the spiral groove (572). The front end of the round rod (57) is also provided with a button (574). The arc groove two (571) is provided with an arc strip two (575). The spiral groove (572) is provided with a spiral strip (576).

4. The tensile strength testing device for preparing rayon yarn with a tension adjustment mechanism according to claim 3, characterized in that: The clamping plate 2 (58) is provided with an arc-shaped groove 3 (581) and several spiral broken grooves 2 (582). An arc-shaped strip 3 (583) is provided in the arc-shaped groove 3 (581), and a spiral broken strip 2 (584) is provided in each of the spiral broken grooves 2 (582).

5. The tensile strength testing device for preparing rayon yarn with a tension adjustment mechanism according to claim 4, characterized in that: The cross-sections of the arc groove one (561), spiral broken groove one (562), arc groove two (571), spiral groove (572), arc groove three (581), spiral broken groove two (582), arc strip one (564), spiral broken strip one (565), arc strip two (575), spiral strip (576), arc strip three (583), and spiral broken strip two (584) are all V-shaped structures. The arc strip one (564), spiral broken strip one (565), arc strip two (575), spiral strip (576), arc strip three (583), and spiral broken strip two (584) are all anti-slip rubber strips.

6. The tensile strength testing device for preparing rayon yarn with a tension adjustment mechanism according to claim 1, characterized in that: The top guide rail (51) is provided with a guide rod (6) that passes through the crossbeam (3), and the first clamp (56) and the second clamp (58) are both provided with guide posts (54) that pass through the slide rod (53).

7. The tensile strength testing device for preparing rayon yarn with a tension adjustment mechanism according to claim 3, characterized in that: The lifting mechanism includes a second servo motor installed in a fixed box (1). The output end of the second servo motor is connected to a lead screw, and a crossbeam (3) is screwed onto the lead screw. A controller is installed inside the fixed box (1), and an operation display screen and operation buttons are installed on the outside of the fixed box (1). The operation display screen, operation buttons, tension sensor (4), first servo motor (52), second servo motor, miniature pressure sensor (55), and button (574) are all electrically connected to the controller.

8. The method of using the tensile strength testing device for preparing rayon yarn with a tension adjustment mechanism as described in any one of claims 1-7, characterized in that: Includes the following steps: Step 1: Cut a standard length of yarn from the yarn bobbin, spirally wind one end of the yarn onto the round rod (57), and then drive the bidirectional lead screw to rotate using the servo motor (52), which in turn drives the sliding rods (53) on both sides to move, so that the miniature pressure sensor (55) drives the clamping plate (56) and clamping plate (58) to move toward the opposite side to clamp the spiral yarn on the round rod (57); Step 2: After pulling the other end of the yarn tight, it is also spirally wound onto the other side of the round rod (57), and then clamped by clamp plate one (56) and clamp plate two (58); Step 3: Move the lifting mechanism to move the crossbeam (3) upward, so that the yarn is stretched. The tension sensor (4) detects the change in tension. When the yarn breaks, check the tension to determine whether the yarn's tensile strength is qualified. Repeat the above steps to repeatedly check the yarn on multiple yarn bobbins for judgment.

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