Method for drawing synthetic fibers

Abstract

This invention relates to a synthetic fiber extraction method, belonging to the field of synthetic fiber technology, to address the problems of radial and axial movement of fiber rolls, leading to tension fluctuations and trajectory deviations in the fiber bundle, reducing fiber bundle strength; continuous oscillation of the fiber bundle during extraction causing tension fluctuations; and the tendency of raw fiber bundles to twist. The synthetic fiber extraction method of this invention includes the following steps: Step A: Loading the fiber roll; Step B: Threading the fiber bundle; Step C: Removing the fiber roll; Step D: Ending the synthetic fiber extraction. This invention utilizes a follow-up unit to monitor and compensate for tension changes in the fiber bundle in real time, reducing tension fluctuations during extraction; and uses a threaded adjustment mechanism to move a pressure adjustment component along the length of the oscillation strip, changing the downward pressure of the second rotating wheel, thereby achieving pressure control to adapt to tension fluctuations in fiber bundles of different specifications.

Description

Technical Field

[0001] This invention relates to the field of synthetic fiber technology, and in particular to a method for drawing out synthetic fibers. Background Technology

[0002] In the synthetic fiber industry, the raw fiber bundles are wound in a figure-eight shape on a hollow winding drum to form fiber rolls. The weight of a fiber roll can reach hundreds of kilograms, so the fiber roll is usually inserted horizontally on the main shaft.

[0003] In actual production, there is a lead-out process, the main purpose of which is to remove the raw filament fiber bundle from the fiber roll before it enters the next process. During lead-out, the fiber roll rotates, and the raw filament fiber bundle moves forward under the action of traction force, passing around the long cylindrical retaining roller, and the diameter of the fiber roll gradually decreases. As the fiber roll rotates, the raw filament fiber bundle swings left and right along the axis of the fiber roll, and changes its direction of travel after passing around the retaining roller. The raw filament fiber bundle slides left and right along the surface of the retaining roller, producing a twisting effect, which easily causes the raw filament fiber bundle to twist, which can cause great damage to the raw filament fiber bundle, resulting in fuzzing, reduced fiber bundle strength, and even fiber bundle breakage. The continuous swinging of the fiber bundle during lead-out causes tension fluctuations in the fiber bundle, ultimately resulting in poor quality textiles. Summary of the Invention

[0004] Based on the above analysis, the present invention aims to provide a synthetic fiber extraction method to solve one of the problems in the prior art: the fiber bundle oscillates continuously during the extraction process, causing tension fluctuations; the raw fiber bundle slides back and forth on the surface of the yarn guide roller, easily causing twisting and fuzzing; and the winding drum and the end face of the main shaft do not fit firmly, easily causing radial and axial movement of the fiber roll, which in turn causes tension fluctuations and trajectory deviations of the fiber bundle, reducing the strength of the fiber bundle.

[0005] The objective of this invention is mainly achieved through the following technical solutions: A method for extracting synthetic fibers includes the following steps: Step A: Load the fiber roll; Step B: Insert fiber bundles; Step C: Remove the fiber roll; Step D: End the synthetic fiber extraction.

[0006] Further, step B: threading the fiber bundle includes: passing the end of the fiber bundle through the guide unit, the follow-tightening unit, and the tension sensor.

[0007] Furthermore, before step C: removing the fiber roll, the method includes the step of adjusting the tension.

[0008] Furthermore, the step of adjusting the tension force includes step 1: preset the tension force.

[0009] Further, step 1: preset tension includes: using a tension sensor to measure the tension of the current fiber bundle, and adjusting the tension of the fiber output unit according to the preset value.

[0010] Furthermore, adjusting the tension of the fiber output unit includes: rotating the fiber roll in the opposite direction to make the tension of the current fiber bundle meet a preset value.

[0011] Furthermore, the step of adjusting the tension force also includes sub-step 2: triggering the test.

[0012] Further, step 2: the extraction test includes: pulling the fiber bundle from the tension sensor toward the next process and testing the fluctuation range of the fiber bundle's tension force.

[0013] Furthermore, before step D: ending the synthetic fiber extraction, the method also includes a step: work completion determination.

[0014] Furthermore, a synthetic fiber extraction device is used.

[0015] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects: (1) The extraction method of the present invention utilizes the following unit to monitor and compensate for the tension change of the fiber bundle in real time, thereby reducing the tension fluctuation of the fiber bundle during the extraction process; the threaded rod motor of the threaded adjustment mechanism drives the threaded rod to rotate, thereby driving the pressure adjustment component to move along the length direction of the fluctuation strip, changing the pressure of the second wheel, thereby realizing the control of the downward pressure to adapt to the tension fluctuation of fiber bundles of different specifications. (2) The extraction method of the present invention uses a tensioning mechanism to expand the width of the first shaft section and reduce the gap between the first shaft section and the winding drum, thereby improving the tightness of the fit between the winding drum and the fiber winding shaft and reducing the tension fluctuation of the fiber bundle caused by the slippage of the winding drum. (3) The extrusion unit of the present invention uses an external air source to push the piston and connecting rod, so that the push block moves along the axial direction of the first shaft section, the expansion block extends radially out of the outer wall of the first shaft section and connects with the inner wall of the winding drum. The expansion block expands the width of the first shaft section and reduces the gap between the first shaft section and the winding drum, thereby improving the tightness of the fit between the winding drum and the fiber winding shaft and reducing the tension fluctuation of the fiber bundle caused by the slippage of the winding drum. (4) The guiding unit of the present invention includes a guide frame assembly and a guide wheel. The guide wheel has an annular groove on its outer periphery, and the fiber bundle is embedded therein. The annular groove restricts the axial displacement of the fiber bundle along the guide wheel, weakens the twisting effect, and reduces the probability of the fiber bundle twisting. The fiber bundle passes through the guide gap between the two first steering rods, is initially limited and corrected in its running posture, constrains the swing of the fiber bundle, keeps the running direction of the fiber bundle perpendicular to the axial direction of the guide wheel, and prevents the fiber bundle from falling out of the annular groove. (5) The guide unit of the present invention is a swingable guide unit. The guide frame can rotate around the card block to realize the adaptive swing of the guide unit. The orientation of the guide wheel can always be consistent with the running direction of the fiber bundle, thereby dynamically conforming to the real-time direction of the fiber bundle, further preventing the fiber bundle from leaving the annular groove. And because the turning angle between the fiber bundle and the first steering rod is reduced, the sliding friction between the fiber bundle and the first steering rod is reduced, further reducing the risk of scratching the fiber bundle.

[0016] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the specification or be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained from the content specifically pointed out in the text and accompanying drawings. Attached Figure Description

[0017] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0018] Figure 1 A flowchart illustrating the method's structure; Figure 2 This is a schematic diagram of the overall structure of the extraction device; Figure 3 This is a front view schematic diagram of the tension adjustment unit; Figure 4 This is a schematic diagram of the internal structure of the tension adjustment unit; Figure 5 This is a side view of the guiding unit and the unwinding unit. Figure 6 This is a schematic diagram of the longitudinal section structure of the fiber winding shaft.

[0019] Figure label: 1-Mounting bracket; 2-Tension sensor; 3-Follow-up unit; 4-Guiding unit; 5-Filament output unit; 6-Fiber bundle; 7-Winding drum; 31-Box body; 32-First roller; 33-Pressure mechanism; 34-Monitor; 35-Third roller; 41-Guide roller; 42-Guide frame; 43-First steering rod; 44-Clamping block; 45-Slide rail; 46-Rolling slip ring; 47-Second steering rod; 51-Shaft seat; 52-Fiber winding Shaft; 53-Motor lead-out; 54-Motor gear; 55-Shaft gear; 56-Air valve; 331-Second rotating wheel; 332-Wave bar; 333-Pressure adjustment component; 334-Threaded rotating rod; 335-Threaded rotating rod motor; 521-First shaft section; 522-Second shaft section; 523-Piston; 524-Piston cylinder; 525-Push block; 526-Connecting rod; 527-Sliding groove; 528-Expansion block; 529-Return spring. Detailed Implementation

[0020] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0021] Example 1: A specific embodiment of the present invention, such as Figure 1 As shown, a synthetic fiber extraction method (hereinafter referred to as the extraction method) is disclosed, comprising the following steps: Step 1: Load the fiber roll; To address the problem that when the fiber roll is inserted laterally into the main shaft, the end face of the winding drum 7 and the main shaft are not firmly attached, which can easily cause the fiber roll to move radially and axially, thereby causing tension fluctuations and deviations in the running trajectory of the fiber bundle 6, reducing the strength of the fiber bundle 6, or even causing the fiber bundle 6 to break. To this end, the fiber roll is inserted laterally into the first shaft section 521 of the fiber output unit 5, and the tensioning mechanism is activated; an external air source introduces gas into the first shaft section 521 through the air passage, and pushes the piston 523 and the connecting rod 526, so that the push block 525 moves along the axial direction of the first shaft section 521, and the expansion block 528 can extend radially out of the outer wall of the first shaft section 521 and connect with the inner wall of the winding drum 7. The expansion block 528 expands the width of the first shaft section 521 and reduces the gap between the first shaft section 521 and the winding drum 7, thereby improving the tightness of the fit between the winding drum 7 and the fiber roll shaft 52. Close the air valve 56, and piston 523 maintains pressure; Step 2: Insert fiber bundles; The end of the fiber bundle 6 is passed through the guide unit 4, the follow-tightening unit 3 and the tension sensor 2, and then connected to the next process; Step 3: Adjust the tension; The fiber bundle 6 is wound in a figure-eight shape on the winding drum 7 to form a fiber roll, so there is a problem that the fiber bundle 6 swings continuously during the drawing process, resulting in tension fluctuations in the fiber bundle 6. It includes the following steps: Step 1: Preset tension; The tension of the current fiber bundle 6 is measured using the tension sensor 2, and the tension of the fiber output unit 5 is adjusted according to the preset value. Preferably, the fiber roll is rotated in the opposite direction so that the tension of the current fiber bundle 6 meets the preset value; Step 2: Introduce the test; The fiber bundle 6 is threaded through the tension sensor 2 towards the next process to test the fluctuation range of the tension force of the fiber bundle 6. Preferably, the test time is 1 minute; Step 3: Adjust the tension; The controller controls the threaded rod motor 335 of the threaded adjustment mechanism to drive the threaded rod 334 to rotate, which in turn drives the pressure adjustment component 333 to move along the length of the wave bar 332, thereby adjusting the downward pressure to meet the preset tension requirements of the fiber bundle 6. Preferably, the controller performs calculations based on a preset tension threshold and real-time feedback to adjust the rotational speed of the lead-out motor 53 so that the lead-out speed matches the fluctuation range of the fiber bundle tension. Preferably, the time interval for real-time feedback is 1-5 seconds; Step 4: Remove the fiber roll; The air valve 56 is opened, reducing the air pressure of the piston 523. The return spring 529 causes the piston 523 and the push block 525 to move towards the second shaft section 522. The expansion block 528 can retract radially into the outer wall of the first shaft section 521 and disengage from the winding drum 7. The winding drum 7 is removed from the fiber winding shaft 52. Step 5: Determining whether the work is completed; Based on the work plan, a manual assessment is made as to whether to continue the work. If you wish to continue working, proceed to step one; if you have completed working, proceed to step six. Step 6: End the synthetic fiber extraction.

[0022] Compared with the prior art, the extraction method of this embodiment uses the following unit 3 to monitor and compensate for the tension change of the fiber bundle 6 in real time, thereby reducing the tension fluctuation of the fiber bundle 6 during the extraction process; in step three, the threaded rod motor 335 of the threaded adjustment mechanism drives the threaded rod 334 to rotate, thereby driving the pressure adjustment component 333 to move along the length direction of the wave bar 332, thereby realizing the control of the downward pressure to adapt to the tension fluctuation of fiber bundles 6 of different specifications.

[0023] In the first step of the extraction method of this embodiment, the width of the first shaft section 521 is expanded by the tensioning mechanism, and the gap between the first shaft section 521 and the winding drum 7 is reduced, thereby improving the tightness of the fit between the winding drum 7 and the fiber winding shaft 52. The external air source pushes the piston 523 and the connecting rod 526, so that the push block 525 moves axially along the first shaft section 521. The expansion block 528 can extend radially out of the outer wall of the first shaft section 521 and connect with the inner wall of the winding drum 7. The expansion block 528 expands the width of the first shaft section 521, reduces the gap between the first shaft section 521 and the winding drum 7, thereby improving the tightness of the fit between the winding drum 7 and the fiber winding shaft 52, and reducing the tension fluctuation of the fiber bundle 6 caused by the slippage of the winding drum 7.

[0024] Example 2: A specific embodiment of the present invention, such as Figure 2 As shown, a synthetic fiber extraction device (hereinafter referred to as the extraction device) is disclosed. The extraction device is used in the synthetic fiber extraction method of Embodiment 1. The extraction device includes a mounting frame 1, a tension sensor 2, a follow-up unit 3, a guide unit 4, and a fiber output unit 5. The tension sensor 2, the follow-up unit 3, the guide unit 4, and the fiber output unit 5 are all mounted on the mounting frame 1. The fiber bundle 6 is extracted from the fiber output unit 5, turned by the guide unit 4, and then enters the next process through the follow-up unit 3 and the tension sensor 2.

[0025] Preferably, the lead-out device in this embodiment further includes a controller (not shown in the figure), which is mounted on the mounting bracket 1.

[0026] like Figure 2 and Figure 5 As shown, the fiber roll includes a fiber bundle 6 and a winding cylinder 7. The winding cylinder 7 is a hollow cylindrical structure with openings at both ends. The fiber bundle 6 is wound in a figure-eight shape around the winding cylinder 7 to form a fiber roll. Therefore, there is a problem that the fiber bundle 6 oscillates continuously during the extraction process, causing tension fluctuations in the fiber bundle 6. To address this, as... Figure 1 As shown, tension sensor 2 is used to detect the tension value of fiber bundle 6, and tension unit 3 is used to compensate for the tension change of fiber bundle 6 in real time, reducing the tension fluctuation of fiber bundle 6 during the extraction process.

[0027] Specifically, such as Figure 3 As shown, the tightening unit 3 includes a box body 31, a first rotating wheel 32, and a pressing mechanism 33. The first rotating wheel 32 is fixed on the outer wall of the box body 31, and the pressing mechanism 33 is located on the inner wall of the box body 31. The first rotating wheel 32 is used to change the direction of travel of the fiber bundle 6, so that the fiber bundle 6 passes around the first rotating wheel 32 and enters the pressing mechanism 33. The pressing mechanism 33 is used to press down the fiber bundle 6 to reduce the tension fluctuation of the fiber bundle 6 during the extraction process.

[0028] Preferably, such as Figure 4As shown, the outer wall of the box 31 is provided with an arc-shaped groove. The pressing mechanism 33 includes a second rotating wheel 331 and a wavy bar 332. One end of the wavy bar 332 is hinged to the inner wall of the box 31, and the other end of the wavy bar 332 is rotatably connected to the second rotating wheel 331 through a rotating shaft. The rotating shaft passes through the arc-shaped groove and is fixedly connected to the wavy bar 332, so that the second rotating wheel 331 can swing along the arc-shaped groove. The groove on the wheel surface of the second rotating wheel 331 can be connected to the fiber bundle 6, ensuring that the fiber bundle 6 is pressed down by the second rotating wheel 331 and prevented from slipping when the tension changes.

[0029] Preferably, the pressing mechanism 33 further includes a pressure adjusting member 333, which is slidably disposed on the wave bar 332. The sliding position of the pressure adjusting member 333 is adjustable and is used to match the lower pressure required for different specifications of fiber bundles 6 to the second rotating wheel 331.

[0030] Preferably, in order to simplify the structure and improve the response speed, the pressure adjustment component 333 is connected to the wave bar 332 through a threaded adjustment mechanism. The threaded adjustment mechanism includes a threaded rod 334 and a threaded rod motor 335. The threaded rod motor 335 drives the threaded rod 334 to rotate, thereby causing the pressure adjustment component 333 to move along the length direction of the wave bar 332, thereby realizing the control of the downward pressure.

[0031] The tensioning unit 3 also includes a monitor 34, which is mounted on the inner wall of the housing 31. The monitor 34 is electrically connected to the controller. The monitor 34 collects the deflection angle changes of the second rotating wheel 331 in real time and transmits the data to the controller. The controller performs calculations based on the preset tension threshold and real-time feedback, and adjusts the rotation speed of the lead-out motor 53 to match the lead-out speed with the fluctuation range of fiber bundle tension.

[0032] Preferably, such as Figure 3 As shown, in order to further stabilize the running direction of the fiber bundle 6, a third rotating wheel 35 is added to the front end of the box 31. Its axis is perpendicular to the initial traveling direction of the fiber bundle 6, and the radius of curvature of the groove on the wheel surface is adapted to the diameter of the fiber bundle 6.

[0033] Compared to existing technologies, the tensioning unit 3 in this embodiment can monitor and compensate for tension changes in the fiber bundle 6 in real time, reducing tension fluctuations in the fiber bundle 6 during the extraction process. The groove on the wheel surface of the second rotating wheel 331 can connect with the fiber bundle 6, ensuring that the fiber bundle 6 is pressed down by the second rotating wheel 331 and prevented from slipping when the tension changes. The pressure adjustment component 333 is connected to the wave bar 332 through a threaded adjustment mechanism. The threaded adjustment mechanism includes a threaded rotating rod 334 and a threaded rotating rod motor 335. The threaded rotating rod motor 335 drives the threaded rotating rod 334 to rotate, causing the pressure adjustment component 333 to move along the length direction of the wave bar 332, thereby realizing the control of the downward pressure.

[0034] Preferably, the guide unit 4 is used to replace the existing wire guide roller, which changes the sliding friction of the fiber bundle 6 to rolling friction, reduces the probability of the fiber bundle twisting, and reduces the risk of surface damage to the fiber bundle 6.

[0035] Specifically, such as Figure 5 As shown, the guiding unit 4 includes a guide frame assembly and a guide wheel 41. The guide frame assembly is mounted on the mounting frame 1, and the guide wheel 41 is rotatably mounted on the guide frame assembly. The guide wheel 41 has an annular groove on its outer periphery, in which the fiber bundle 6 is embedded; and the annular groove restricts the axial displacement of the fiber bundle 6 along the guide wheel 41, weakens the twisting effect, and reduces the probability of the fiber bundle becoming twisted.

[0036] The fiber bundle 6 will still oscillate, and cannot maintain the axis of the guide wheel 41 perpendicular to the running direction of the fiber bundle 6 in real time, causing the fiber bundle 6 to detach from the annular groove. Therefore, preferably, the guide frame assembly includes a guide frame 42 and two first steering rods 43, both connected to the guide frame 42. The guide wheel 41 is rotatably connected to the guide frame 42. The fiber bundle 6 passes through the guide gap between the two first steering rods 43, constraining the oscillation of the fiber bundle 6, maintaining the running direction of the fiber bundle 6 perpendicular to the axis of the guide wheel 41, and preventing the fiber bundle 6 from detaching from the annular groove. After the fiber bundle 6 is led out, it only oscillates horizontally, and after entering the guide gap between the two first steering rods 43, it will not slide axially with the two first steering rods 43, further reducing the twisting effect and decreasing the probability of fiber bundle twisting.

[0037] Preferably, in order to reduce the sliding friction between the fiber bundle 6 and the first steering rod 43, the guide unit 4 is a swingable guide unit. The guide frame assembly also includes a locking block 44. The guide frame 42 is rotatably connected to the locking block 44. The guide frame 42 can rotate around the locking block 44 to realize the adaptive swing of the guide unit 4. The orientation of the guide wheel 41 can always be consistent with the running direction of the fiber bundle, thereby dynamically conforming to the real-time direction of the fiber bundle 6, further preventing the fiber bundle 6 from detaching from the annular groove. Moreover, because the turning angle between the fiber bundle 6 and the first steering rod 43 is reduced, the sliding friction between the fiber bundle 6 and the first steering rod 43 is reduced, further reducing the risk of scratching the fiber bundle 6.

[0038] Furthermore, the card block 44 is fixedly connected to the mounting bracket 1.

[0039] However, the axial lengths of fiber rolls of different specifications vary, and the guide wheel 41 works best when positioned in the middle of the fiber roll. Furthermore, the guide frame assembly also includes a slide 45, which is mounted on the mounting bracket 1, and the locking block 44 is slidably connected to the slide 45. By sliding on the slide 45, the relative position of the locking block 44 and the fiber roll can be adjusted to accommodate fiber rolls of different axial lengths. The guide wheel 41 can be aligned with the middle position along the length of the fiber roll, ensuring that the guide wheel 41 is always at the tension balance point of the fiber bundle 6. The locking block 44 and the slide 45 can be fixed together by a set screw.

[0040] Preferably, in order to reduce the rotational friction between the guide frame 42 and the card block 44 and shorten the swing response time of the guide unit 4, a rolling slip ring 46 is provided between the guide frame 42 and the card block 44.

[0041] Preferably, the guide frame assembly further includes a second steering rod 47, which is disposed on the guide frame 42 and arranged perpendicularly to the first steering rod 43. There are two second steering rods 47. The fiber bundle 6 passes through the guide gap between the two second steering rods 47 and is again limited, constraining the swing of the fiber bundle 6, keeping the running direction of the fiber bundle 6 perpendicular to the axial direction of the guide wheel 41, and preventing the fiber bundle 6 from leaving the annular groove.

[0042] Preferably, such as Figure 5 As shown, the fiber output unit 5 includes a rotating shaft seat 51 and a fiber winding shaft 52. The fiber winding shaft 52 is rotatably mounted on the rotating shaft seat 51, and the rotating shaft seat 51 is mounted on the mounting frame 1.

[0043] Preferably, such as Figure 6 As shown, the fiber winding shaft 52 includes a first shaft section 521 and a second shaft section 522. The first shaft section 521 is used to insert the winding cylinder 7, and the second shaft section 522 is used to rotatably connect with the shaft seat 51.

[0044] Preferably, the fiber output unit 5 further includes an output motor 53, a motor gear 54, and a rotating shaft gear 55. The motor gear 54 is disposed on the output shaft of the output motor 53, and the rotating shaft gear 55 is sleeved on the second shaft section 522. The motor gear 54 meshes with the rotating shaft gear 55, thereby driving the fiber roll rotating shaft 52 to rotate and unwind.

[0045] Compared with the prior art, the guide unit 4 in this embodiment is a swingable guide unit. The guide unit 4 includes a guide frame assembly and a guide wheel 41. The guide wheel 41 has an annular groove on its outer periphery, in which the fiber bundle 6 is embedded. The annular groove restricts the axial displacement of the fiber bundle 6 along the guide wheel 41, weakens the twisting effect, and reduces the probability of the fiber bundle becoming twisted. The fiber bundle 6 passes through the guide gap between the two first steering rods 43, is initially limited and corrected in its running posture, constrains the swing of the fiber bundle 6, keeps the running direction of the fiber bundle 6 perpendicular to the axial direction of the guide wheel 41, and prevents the fiber bundle 6 from leaving the annular groove. The guide frame 42 can rotate around the locking block 44 to realize the adaptive swing of the guide unit 4. The orientation of the guide wheel 41 can always be consistent with the running direction of the fiber bundle, thereby dynamically conforming to the real-time direction of the fiber bundle 6, further preventing the fiber bundle 6 from leaving the annular groove. Moreover, because the turning angle between the fiber bundle 6 and the first steering rod 43 is reduced, the sliding friction between the fiber bundle 6 and the first steering rod 43 is reduced, further reducing the risk of scratching the fiber bundle 6.

[0046] When the fiber roll is inserted laterally into the main shaft, there is a problem that the end face of the winding drum 7 and the main shaft may not fit firmly, which can easily lead to radial and axial movement of the fiber roll. This can cause tension fluctuations and trajectory deviations in the fiber bundle 6, reducing the strength of the fiber bundle 6, or even causing the fiber bundle 6 to break. Therefore, preferably, as follows: Figure 6 As shown, the yarn output unit 5 also includes a tensioning mechanism, which is disposed on the first shaft section 521. The first shaft section 521 is a cylinder.

[0047] Preferably, the tensioning mechanism includes a piston 523. In some optional embodiments, the piston 523 is connected to the inner wall of the first shaft segment 521 and is slidable along the axial direction of the first shaft segment 521. The second shaft segment 522 includes a venting channel through which external high-pressure air can be introduced into the first shaft segment 521 and push the piston 523, causing the piston 523 to slide along the axial direction of the first shaft segment 521.

[0048] In some alternative embodiments, for ease of assembly, the tensioning mechanism further includes a piston cylinder 524, which is disposed on the first shaft segment 521. The piston 523 is connected to the inner wall of the piston cylinder 524 and is capable of sliding along the axial direction of the first shaft segment 521.

[0049] Preferably, the tensioning mechanism further includes a push block 525 and a connecting rod 526, with the two ends of the connecting rod 526 connected to the push block 525 and the piston 523, respectively. The piston 523 can cause the push block 525 to move axially along the first shaft segment 521 via the connecting rod 526.

[0050] Preferably, the tightening mechanism further includes a sliding groove 527 and an expansion block 528. The sliding groove 527 is disposed on the push block 525 and is arranged along the axis of the connecting rod 526. The end of the sliding groove 527 closer to the piston 523 is the proximal end, and the end of the sliding groove 527 farther from the piston 523 is the distal end. The distance from the distal end to the axis of the connecting rod 526 is less than the distance from the proximal end to the axis of the connecting rod 526. The expansion block 528 is radially inserted into the outer wall of the first shaft segment 521 and connected to the sliding groove 527, and can slide along the sliding groove 527. An external air source can introduce gas through the ventilation channel first shaft section 521 and push the piston 523 and connecting rod 526, causing the push block 525 to move axially along the first shaft section 521. The expansion block 528 can extend radially out of the outer wall of the first shaft section 521 and connect with the inner wall of the winding drum 7. The expansion block 528 expands the width of the first shaft section 521 and reduces the gap between the first shaft section 521 and the winding drum 7, thereby improving the tightness of the fit between the winding drum 7 and the fiber winding shaft 52.

[0051] Preferably, multiple sliding grooves 527 and expansion blocks 528 are provided and are evenly distributed along the circumference of push block 525, so that the center line of winding cylinder 7 coincides with the central axis of the first shaft segment 521, thereby reducing the radial movement of the fiber roll.

[0052] Preferably, the tensioning mechanism further includes a return spring 529, which is sleeved on the connecting rod 526. One end of the return spring 529 is connected to the piston 523, and the other end is connected to the piston cylinder 524. The return spring 529 is used to push the piston 523 towards the second shaft section 522. After the air pressure in the piston 523 disappears, the piston 523 and the push block 525 move towards the second shaft section 522. The expansion block 528 can be radially retracted into the outer wall of the first shaft section 521 and disengage from the winding cylinder 7 so that the winding cylinder 7 can be removed from the fiber winding shaft 52.

[0053] Preferably, the yarn output unit 5 further includes an air valve 56, which is connected to a vent channel and is used to control the intake and exhaust of gas.

[0054] Compared with the prior art, the tensioning mechanism of this embodiment can expand the width of the first shaft section 521 and reduce the gap between the first shaft section 521 and the winding drum 7, thereby improving the tightness of the fit between the winding drum 7 and the fiber winding shaft 52; an external air source can introduce gas through the ventilation channel of the first shaft section 521 and push the piston 523 and the connecting rod 526, causing the push block 525 to move axially along the first shaft section 521, and the expansion block 528 can extend radially out of the outer wall of the first shaft section 521 and connect with the inner wall of the winding drum 7. 28. The width of the first shaft section 521 is increased, and the gap between the first shaft section 521 and the winding drum 7 is reduced, thereby improving the tightness of the fit between the winding drum 7 and the fiber winding shaft 52. The return spring 529 is used to push the piston 523 towards the second shaft section 522. After the air pressure of the piston 523 is removed, the piston 523 and the push block 525 move towards the second shaft section 522. The expansion block 528 can be radially retracted into the outer wall of the first shaft section 521 and disengage from the winding drum 7 so as to remove the winding drum 7 from the fiber winding shaft 52.

[0055] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A synthetic fiber drawing method characterized by, The method comprises the following steps: Step A: loading a fiber roll; Step B: threading a fiber bundle; Step C: removing the fiber roll; Step D: ending the synthetic fiber drawing.

2. The synthetic fiber take-off method according to claim 1, characterized by, The step B: threading a fiber bundle comprises threading the end of the fiber bundle (6) through the guide unit (4), the tensioning unit (3) and the tension sensor (2).

3. The synthetic fiber take-off method according to claim 1, characterized by, Before the step C: removing the fiber roll, the method further comprises the step of regulating the tension.

4. The synthetic fiber take-off method according to claim 3, characterized by, The regulating the tension comprises sub-step 1: presetting the tension.

5. The synthetic fiber take-off method according to claim 4, characterized by, The sub-step 1: presetting the tension comprises measuring the tension of the current fiber bundle (6) by the tension sensor (2), and adjusting the tensioning degree of the yarn unit (5) according to the preset value.

6. The synthetic fiber take-off method according to claim 5, characterized by, The adjusting the tensioning degree of the yarn unit (5) comprises reversely rotating the fiber roll so that the tension of the current fiber bundle (6) meets the preset value.

7. The synthetic fiber take-off method according to claim 4, characterized by, The regulating the tension further comprises sub-step 2: drawing test.

8. The synthetic fiber take-off method according to claim 7, characterized by, The sub-step 2: drawing test comprises pulling the fiber bundle (6) from the tension sensor (2) to the next process direction, and testing the fluctuation range of the tension of the fiber bundle (6).

9. The synthetic fiber take-off method according to claim 1, characterized by, Before the step D: ending the synthetic fiber drawing, the method further comprises the step of work completion determination.

10. The synthetic fiber take-off method according to any one of claims 1 to 9, characterized by, The method uses a synthetic fiber drawing device.

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