Multistage constant tension traction and winding device of plastic grass wire drawing machine

Abstract

This invention discloses a multi-stage constant tension traction winding device for a plastic straw filament drawing machine, relating to the field of traction winding technology. It includes a winding mechanism and a tension compensation mechanism. The tension compensation mechanism includes a roller and a lifting assembly. The roller is rotatably mounted on the lifting assembly, which drives the roller to float up and down according to changes in filament tension. It also includes a damping cylinder, with its cylinder end fixedly mounted and its telescopic end connected to the lifting assembly. The damping cylinder is filled with hydraulic oil, and a through hole is formed on the piston of the damping cylinder, through which a variable diameter rod passes. This multi-stage constant tension traction winding device for a plastic straw filament drawing machine eliminates the precision decay problem caused by elastic element fatigue by replacing springs with its own weight. Simultaneously, the variable diameter rod achieves gradient damping where the upward resistance decreases with displacement, allowing the roller to quickly release peak tension during sudden changes in tension, thus balancing long-term stability and dynamic response capability.

Description

Technical Field

[0001] This invention relates to the field of traction winding technology, and in particular to a multi-stage constant tension traction winding device for a plastic straw fiber drawing machine. Background Technology

[0002] In the winding operation of plastic straw filament drawing machines, the stability of the filament tension directly affects the winding quality and production efficiency. To ensure that the filament maintains appropriate tension throughout the winding process, the industry commonly uses a floating roller structure for tension adjustment. This type of device typically mounts a tension roller on a liftable support via an elastic element, allowing the roller to float up and down with changes in filament tension. When the filament tension increases, the roller is lifted upwards, increasing the filament travel to release excess tension; when the tension decreases, the roller returns to its original position under the action of the elastic element, re-pressing the filament to maintain tension. This floating roller structure achieves dynamic tension adjustment to a certain extent, representing a significant improvement over fixed tension rollers and adapting to some tension fluctuations during production.

[0003] However, the elastic support element widely used in existing floating roller structures is primarily a spring. Springs inevitably experience metal fatigue during long-term use, and their elastic coefficient drifts with increasing operating time, leading to inaccurate support force. Furthermore, the elastic force of a spring is linearly related to its deformation; when faced with sudden changes in tension, the spring's response characteristics cannot adaptively adjust to changes in operating conditions, easily resulting in overshoot or response lag. Therefore, existing spring-supported floating roller structures have inherent limitations in terms of long-term accuracy retention and dynamic response capabilities, and urgently require improvement.

[0004] Therefore, there are still shortcomings and deficiencies in the existing technology. How to provide a multi-stage constant tension traction winding device for plastic straw drawing machine is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-stage constant tension traction winding device for a plastic straw fiber drawing machine. This device solves the problem that existing plastic straw fiber drawing machines often use a spring-supported floating roller structure for tension adjustment. However, after long-term use, the elastic coefficient of the springs drifts due to metal fatigue, causing the tension control accuracy to gradually decrease and making it difficult to meet the requirements for long-term stable operation.

[0006] To achieve the above objectives, the present invention provides a multi-stage constant tension traction winding device for a plastic straw filament drawing machine, including a winding mechanism and a tension compensation mechanism. The tension compensation mechanism includes a roller and a lifting assembly. The roller is rotatably mounted on the lifting assembly. The lifting assembly is configured to rely on the weight of the roller and its linked components to balance the tension of the filament, so as to drive the roller to float up and down with the tension change.

[0007] Preferably, it also includes a damping cylinder, the cylinder body end of which is fixedly installed, the telescopic end of which is connected to the lifting assembly, the damping cylinder is filled with hydraulic oil, the piston of which has a through hole, a variable diameter rod is inserted through the through hole, and the annular gap between the variable diameter rod and the inner wall of the through hole forms a flow passage section.

[0008] Preferably, the variable diameter rod body includes a large diameter section and a small diameter section. The large diameter section is located in the lower half of the variable diameter rod body, and the small diameter section is located in the upper half of the variable diameter rod body. Under normal conditions, the piston is located in the position of the large diameter section.

[0009] Preferably, the small diameter section is configured as a tapered columnar structure that gradually decreases in size from bottom to top.

[0010] Preferably, the closed end of the damping cylinder is provided with a detachable cover, and one end of the variable diameter rod is fixed to the inner wall of the cover.

[0011] Preferably, the lifting assembly includes a base plate, a fixed plate, a fixed frame, and a lifting plate. The base plate is fixedly installed, the fixed plate is fixed above the base plate, the fixed frame is fixed to one side of the fixed plate, and the lifting plate is slidably installed on the fixed frame via a slide rail assembly.

[0012] Preferably, the roller is rotatably mounted on the lifting plate via bearings.

[0013] Preferably, the winding mechanism includes a base, a mounting frame, a drive unit, and a winding roller. The mounting frame is movably mounted above the base via a slide rail, and the winding roller is rotatably mounted on the mounting frame via a bearing.

[0014] Preferably, the slide rail assembly includes a track and a slider. The slider is fixed to the lifting plate, the track is fixed to the fixed frame, and the slider is slidably connected to the track, so that the lifting plate can move up and down along the track.

[0015] Preferably, the large-diameter section and the small-diameter section of the variable-diameter rod are configured to cooperate so that the piston receives a gradually decreasing damping force as the displacement increases during the upward movement, so as to accelerate the repositioning speed of the roller to release the tension peak when the tension of the yarn changes suddenly; and receives a gradually increasing damping force as the displacement decreases during the downward movement of the piston, so as to slow down the fall speed of the roller to avoid reverse impact when the tension recovers.

[0016] The present invention has the following advantages: (1) Compared with the above-mentioned background technology, the multi-stage constant tension traction winding device for plastic straw drawing machine provided by the present invention replaces the traditional spring support structure with a self-weight floating mechanism, which avoids the problem of decreased tension adjustment accuracy caused by metal fatigue and elastic coefficient drift after long-term use of springs. The gravity provided by the self-weight is a constant value and will not decrease with the passage of time or the increase of the number of uses. Therefore, the tension compensation mechanism can maintain stable and reliable adjustment performance throughout its entire life cycle.

[0017] (2) Compared with the above-mentioned background technology, the multi-stage constant tension traction winding device for plastic straw drawing machine provided by the present invention sets a variable diameter rod in the damping cylinder so that the flow cross section gradually expands as the rising distance increases during the piston's ascent, and the damping force decreases accordingly, realizing the gradient damping characteristic of "the farther the ascent, the smaller the resistance". This solves the problem of filament breakage caused by insufficient yielding speed when dealing with sudden tension changes in traditional floating mechanisms: when the tension of the filament increases instantaneously, the roller obtains gradually decreasing damping in the early stage of ascent, and can complete the yielding action with faster acceleration and release the tension peak in time; while when the tension recovers, the damping force gradually increases as the piston descends, so that the roller can be smoothly reset and avoid reverse impact caused by rapid descent. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the tension compensation mechanism of the present invention; Figure 3 This is a schematic diagram of the internal structure of the cylinder block of the present invention; Figure 4 This is a schematic diagram of the cylinder block and variable diameter rod structure of the present invention; Figure 5 This is a schematic diagram of the variable diameter rod structure of the present invention; Figure 6 For the present invention Figure 2 A magnified schematic diagram of the structure at point A.

[0020] In the diagram: 1. Winding mechanism; 2. Tension compensation mechanism; 3. Wire; 4. Slide rail assembly; 5. Damping cylinder; 6. End cap; 7. Sealing cap; 8. Adjusting component; 101. Base; 102. Mounting frame; 103. Drive unit; 104. Winding roller; 201. Roller body; 202. Lifting assembly; 2021. Base plate; 2022. Fixing plate; 2023. Fixing frame; 2024. Lifting plate; 501. Cylinder body; 502. Piston; 503. Telescopic rod; 504. Through hole; 800. Variable diameter rod body; 801. Large diameter section; 802. Small diameter section; 401. Slider; 402. Rail. Detailed Implementation

[0021] 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.

[0022] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] This invention provides a multi-stage constant tension traction winding device for a plastic straw filament drawing machine. It replaces springs with its own weight, eliminating the accuracy decay problem caused by elastic element fatigue. At the same time, it achieves gradient damping by using a variable diameter rod 800 to reduce the upward resistance with displacement, enabling the roller to quickly release the peak value when the tension changes abruptly. This balances long-term stability and dynamic response capability. Furthermore, it solves the problem that existing plastic straw filament drawing machines often use spring-supported floating roller structures for tension adjustment. However, after long-term use, the elastic coefficient of the springs drifts due to metal fatigue, causing the tension control accuracy to gradually decrease and making it difficult to meet the requirements of long-term stable operation.

[0024] Please refer to this as well. Figures 1 to 2 The multi-stage constant tension traction winding device for a plastic straw filament drawing machine provided by this invention mainly consists of a winding mechanism 1 and a tension compensation mechanism 2. The winding mechanism 1 achieves continuous winding of the straw filaments by its own driving rotation, while the tension compensation mechanism 2 adjusts the tension of the filaments 3 in real time during the winding process to ensure that the winding operation is carried out stably and orderly.

[0025] Specifically, the winding mechanism 1 includes a base 101, a mounting frame 102, a drive unit 103, and a winding roller 104. The mounting frame 102 is movably mounted above the base 101 via a slide rail, and can flexibly adjust its position according to the winding position, thereby ensuring that the yarn 3 is evenly distributed on the surface of the winding roller 104. The winding roller 104 is rotatably mounted on the mounting frame 102 via bearings, and its shaft is powered by the drive unit 103. The drive unit 103 is typically driven by an electric motor and is connected to the shaft of the winding roller 104 via a transmission assembly to achieve reliable energy transfer.

[0026] In actual production, the tension of the yarn 3 is not constant but fluctuates due to various factors. For example, sudden changes in winding speed, tension fluctuations caused by differences in the diameter of the raw material at the unwinding end, unevenness in the material or thickness of the yarn 3 itself, material expansion and contraction caused by changes in ambient temperature and humidity, and minor vibrations during mechanical operation can all cause the tension to deviate from the set value. However, in existing technologies, tension rollers are mostly fixed, and operators can only manually adjust the height of the tension rollers via a threaded mechanism before each winding to preset a static tension value. Once the tension changes dynamically due to the aforementioned factors during operation, the fixed tension roller cannot respond in time, leading to uncontrolled tension of the yarn 3 and severely affecting the winding quality.

[0027] To address this issue, this embodiment introduces a tension compensation mechanism 2, which automatically compensates for tension fluctuations. This mechanism mainly includes a roller 201 and a lifting assembly 202. The roller 201 is located on the conveying path of the yarn 3, guiding and supporting the yarn 3; the lifting assembly 202 drives the roller 201 to move up and down, and this lifting action is adaptively completed according to the actual tension of the yarn 3, requiring no manual intervention and avoiding winding defects caused by adjustment lag.

[0028] It should be noted that in traditional designs, the raising and lowering of the roller 201 often relies on spring support: when the tension of the yarn 3 tightens, the tension overcomes the spring force to push the roller 201 up or down, and the compression of the spring maintains a certain tension to prevent the yarn 3 from slackening; when the tension loosens, the spring releases, causing the roller 201 to move in the opposite direction and continue to support the yarn 3. However, after long-term use, the spring will experience fatigue, and the elastic coefficient will gradually drift, causing its supporting force to become less precise. Consequently, the adaptive tension adjustment accuracy will decrease, ultimately affecting the long-term stability of the device and the winding quality.

[0029] Please refer to the following for further details. Figures 1 to 2 The lifting assembly 202 consists of a base plate 2021, a fixing plate 2022, a fixing frame 2023, and a lifting plate 2024. The base plate 2021 is stably installed on the ground, and the fixing plate 2022 is fixed on it. The fixing frame 2023 is fixedly connected to one side of the fixing plate 2022, and a lifting plate 2024 is slidably connected to one side of the fixing frame 2023 through a slide rail assembly 4. The lifting plate 2024 can be smoothly raised and lowered along the slide rail. The roller body 201 is rotatably installed on the lifting plate 2024 through a bearing, and its height changes synchronously with the movement of the lifting plate 2024, thereby realizing the dynamic adjustment of the tension of the thread 3.

[0030] Please refer to the details as well. Figure 2 and Figure 6The slide rail assembly 4 includes a track 402 and a slider 401. The slider 401 is fixed to the lifting plate 2024, while the track 402 is fixed to the fixing frame 2023. The slider 401 is slidably connected to the track 402, so that the lifting plate 2024 can be raised and lowered.

[0031] In actual winding operations, the yarn 3 is guided to the area below the roller 201. The tension range is initially set through coordinated control of the unwinding and winding ends, while simultaneously matching the weight of the roller 201 to ensure its own weight precisely matches the ideal tension value required by the yarn 3. When the yarn 3 has normal tension, the roller 201 floats within a certain equilibrium height range. If the tension increases due to external disturbances, the yarn 3 will overcome part of its own weight to lift the roller 201 upwards, preventing excessive tension and breakage caused by the roller 201 remaining stationary. Furthermore, the weight of the roller 201 itself continues to apply a stable reverse pulling force to the yarn 3, preventing excessive tension relaxation. Conversely, when the tension decreases, the roller 201 naturally presses down under its own weight, re-pressing the yarn 3, causing the tension to quickly return to the standard range. Furthermore, through the above settings, compared with the traditional spring support structure, the problem of decreased accuracy caused by metal fatigue and elastic decay after long-term use of springs is avoided. This not only greatly improves the long-term stability and reliability of tension adjustment, but also reduces the maintenance frequency and replacement cost, enabling the entire device to maintain accurate and long-lasting constant tension control even under continuous high-speed winding conditions.

[0032] In addition, please refer to the following: Figures 1 to 4 A damping cylinder 5 is also installed on the upward path of the lifting plate 2024. The cylinder body 501 of the damping cylinder 5 is fixed to the top of the fixed frame 2023, while its telescopic end faces downward and is connected to the lifting plate 2024. Through the installation of this damping cylinder 5, the initial position of the lifting plate 2024 can be effectively matched and constrained, so that the roller body 201 is at a preset reference height when it is not subjected to the tension of the yarn 3, thereby providing a stable starting reference point for subsequent tension adjustment.

[0033] Specifically, the damping cylinder 5 includes a cylinder body 501, a piston 502, a telescopic rod 503, and a through hole 504. The closed end of the cylinder body 501 is fixed to the top of the fixing frame 2023, and the open end is fitted with an end cap 6. The piston 502 is slidably sealed inside the cylinder body 501, and the telescopic rod 503 is fixedly connected to its open end side. The telescopic rod 503 extends through the end cap 6 to the outside and is slidably sealed to the end cap 6 by a sealing element. The outer end of the telescopic rod 503 is fixedly connected to the lifting plate 2024. The piston 502 has an axially penetrating through hole 504 inside, and the cylinder body 501 is filled with hydraulic oil. When the piston 502 moves inside the cylinder body 501, the hydraulic oil is forced to flow through the through hole 504. The resulting viscous damping force causes the lifting plate 2024 to experience controllable resistance during both its rising and falling processes, thereby achieving effective control of the speed of the lifting plate 2024. In addition, the flow orifice diameter of the through hole 504 is adjustable via the adjusting element 8, which further enhances the flexibility of damping force adjustment.

[0034] For more specific details, please refer to the following: Figures 4 to 5 The adjusting component 8 is a variable diameter rod 800. In this embodiment, the cylinder 501 is further a cylindrical body with open ends, and its closed end is sealed by a removable cap 7 via threads. One end of the variable diameter rod 800 is fixed to the inner wall of the cap 7, and the other end extends through the through hole 504 on the piston 502 to the inside of the cylinder 501 near the open end cap 6. The variable diameter rod 800 includes a small diameter section 802 and a large diameter section 801, where the large diameter section 801 is located in the lower half and the small diameter section 802 is located in the upper half. The two ends are smoothly transitioned. Under normal conditions, the piston 502 is located in the position of the large diameter section 801. At this time, the annular gap between the variable diameter rod 800 and the inner wall of the through hole 504 is the flow section. Whether the piston 502 moves upward or downward, the hydraulic oil must flow through this gap to generate a stable damping force. The damping force works in conjunction with the overall weight of the roller 201 and the lifting plate 2024 to match the standard tension requirements of the yarn 3. Since the cover 7 is detachable, the operator only needs to replace the variable diameter rod 800 with different diameter segment parameters to quickly adjust the size of the flow cross section, thereby flexibly adapting to different specifications and tension requirements of yarn 3, significantly improving the versatility and process adaptability of the device.

[0035] With the above settings, the yarn 3 is guided to the area below the roller 201. The tension range is initially set through the coordinated control of the unwinding and rewinding ends. At the same time, the weight of the roller 201 and the lifting plate 2024 is used to match the ideal tension value required by the yarn 3. When the tension of the yarn 3 is normal, the roller 201 is suspended within a certain equilibrium height range. At this time, the piston 502 in the damping cylinder 5 is located at the position of the large diameter section 801 of the variable diameter rod 800. The annular gap between the variable diameter rod 800 and the inner wall of the through hole 504 forms a stable flow section. The hydraulic oil flows through this gap to generate a moderate damping force, keeping the lifting plate 2024 stable. Once the tension of the wire 3 increases due to external disturbance, the wire 3 overcomes part of its own weight and pushes the roller 201 upward. The rise of the roller 201 drives the lifting plate 2024 and the telescopic rod 503 and piston 502 connected to it to move upward synchronously to make way. When the tension of the wire 3 is too low, the lifting plate 2024 and the weight of the roller 201 lower the pressure column to maintain the tension of the wire 3.

[0036] However, the aforementioned self-weight floating mechanism has a significant potential risk in actual operation: when the tension of the yarn 3 increases sharply due to sudden factors (such as jamming at the unwinding end, instantaneous acceleration of the winding motor, or sudden changes in the diameter of the raw material roll), although theoretically the roller 201 can release the tension by rising to make way, the upward response speed of the roller 201 is limited by the combined effect of its own inertia. If the rate of tension increase far exceeds the upward acceleration that the roller 201 can achieve, an imbalance will occur where "the making-way speed cannot keep up with the rate of tension increase." At this time, within the brief window before the roller 201 has completed sufficient making-way, the actual tension of the yarn 3 will continue to rise, far exceeding the equilibrium tension value corresponding to the self-weight of the roller 201. Because the roller 201 fails to make sufficient travel in time to dissipate the excess tension, the yarn 3 is forced to bear an instantaneous load far exceeding its tensile strength, thus leading to breakage. This breakage was not due to the roller 201's inability to rise, but rather because the rate of ascent was insufficient to counteract the surge in tension: the greater the tension, the greater the upward thrust on the roller 201, and theoretically, the greater the acceleration should be. However, due to the inherent mass and damping of the system, the roller 201 needs time to gain sufficient speed from rest, while the tension peak often reaches the failure threshold in a short time. Therefore, even if the roller 201 eventually manages to rise and give way, the yarn breakage accident has already occurred prematurely.

[0037] In other words, the core idea behind the above setup is that when the tension of the yarn 3 increases, the movable roller 201 compensates for the excess tension, thereby releasing the tension beyond the standard range and preventing the yarn 3 from breaking due to excessive tension. However, the upward movement of the roller 201 essentially depends on the driving force applied when the tension of the yarn 3 increases. When the tension changes slowly, the roller 201 has enough time to respond and rise gradually, allowing the tension to be released smoothly. But if the tension reaches its peak instantaneously in a very short time, i.e., a rapid tightening rather than a gradual increase, the hydraulic damping force remains constant for a short period, and the inertial mass of the roller 201 itself cannot be overcome instantaneously. Therefore, the rising speed of the roller 201 will be difficult to match the rate of tension surge. At this point, the tension exceeding the standard range on the yarn 3 cannot be effectively released through the timely compensation of the roller 201, causing the yarn 3 to bear an excessive load before the roller 201 has fully compensated, leading to breakage.

[0038] Therefore, in this embodiment, the variable diameter rod 800 is configured such that the upper half is a small diameter section 802, and the small diameter section 802 is configured as a tapered column, and the small diameter section 802 is configured to gradually decrease in size from bottom to top.

[0039] When the tension of the yarn 3 is normal, the roller 201 is suspended in a certain balance height range. At this time, the piston 502 in the damping cylinder 5 is located at the position of the large diameter section 801 of the variable diameter rod 800. The annular gap between the variable diameter rod 800 and the inner wall of the through hole 504 forms a stable flow section. The hydraulic oil flows through this gap to generate an appropriate damping force, so that the lifting plate 2024 remains stable. Once the tension of the yarn 3 increases due to external disturbance, the yarn 3 overcomes part of its own weight and pushes the roller 201 upward. The rise of the roller 201 drives the lifting plate 2024 and the telescopic rod 503 and piston 502 connected to it to move upward synchronously. At this time, the piston 502 moves along the variable diameter rod 800 from the large diameter section 801 to the small diameter section 802. As the rising distance of the piston 502 increases, the annular gap between the variable diameter rod 800 and the through hole 504 gradually expands, the flow cross section increases accordingly, and the damping force decreases accordingly. This makes the resistance of the roller 201 decrease during the rising and yielding process, so that the tension peak can be released at a faster speed, avoiding the yarn 3 from being subjected to excessive load and breaking due to the yielding speed not keeping up with the tension growth rate.

[0040] Once the tension of the yarn 3 returns to normal, the roller 201 naturally presses down under its own weight. The piston 502 moves along the variable diameter rod 800 from the small diameter section 802 to the large diameter section 801, gradually reducing the flow cross-section and correspondingly increasing the damping force. This allows the roller 201 to fall smoothly back down, avoiding reverse impact caused by rapid descent. Furthermore, under normal operating conditions, it provides a stable damping force to maintain system balance. When tension suddenly increases, it automatically reduces damping to achieve rapid repositioning and prevent yarn breakage; when tension recovers, it increases damping to ensure smooth reset.

[0041] In this embodiment, during operation: the yarn 3 is guided to the area below the roller 201. The tension range is initially set through the coordinated control of the unwinding and rewinding ends. Simultaneously, the weight of the roller 201 and the lifting plate 2024 is used to match the ideal tension value required by the yarn 3. When the tension of the yarn 3 is normal, the roller 201 is suspended within a certain equilibrium height range. At this time, the piston 502 in the damping cylinder 5 is located at the position of the large diameter section 801 of the variable diameter rod 800. The annular gap between the variable diameter rod 800 and the inner wall of the through hole 504 forms a stable flow section. Hydraulic oil flows through this gap, generating a moderate damping force, which keeps the lifting plate 2024 stable. Once the tension of the yarn 3 increases due to external disturbance, the yarn 3 overcomes part of its own weight and pushes the roller 201 upward. The rise of the roller 201 drives the lifting plate 2024 and the telescopic rod 503 and piston 502 connected to it to move upward synchronously. At this time, the piston 502 moves along the variable diameter rod 800 from the large diameter section 801 to the small diameter section 802. As the rising distance of the piston 502 increases, the annular gap between the variable diameter rod 800 and the through hole 504 gradually expands, the flow cross section increases accordingly, and the damping force decreases accordingly. This makes the resistance of the roller 201 decrease during the rising and yielding process, so that the tension peak can be released at a faster speed, avoiding the yarn 3 from being subjected to excessive load and breaking due to the yielding speed not keeping up with the tension growth rate. When the tension of the yarn 3 returns to normal, the roller 201 naturally presses down under its own weight. The piston 502 moves along the variable diameter rod 800 from the small diameter section 802 to the large diameter section 801. The flow cross section gradually decreases, and the damping force increases accordingly, so that the roller 201 falls back smoothly, avoiding reverse impact caused by rapid descent.

[0042] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0043] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A multi-stage constant tension traction and winding device of a plastic grass filament drawing machine, comprising a winding mechanism (1) and a tension compensation mechanism (2), characterized in that: The tension compensation mechanism (2) includes a roller (201) and a lifting assembly (202). The roller (201) is rotatably mounted on the lifting assembly (202). The lifting assembly (202) is configured to rely on the weight of the roller (201) and its linked components to balance the tension of the yarn (3), so as to drive the roller (201) to float up and down with the tension change.

2. A multi-stage constant tension drawing and winding device for a plastic grass filament drawing machine according to claim 1, characterized in that, It also includes a damping cylinder (5), the cylinder body (501) end of the damping cylinder (5) is fixedly installed, the telescopic end of the damping cylinder (5) is connected to the lifting assembly (202), the damping cylinder (5) is filled with hydraulic oil, the piston (502) of the damping cylinder (5) has a through hole (504), a variable diameter rod (800) is inserted in the through hole (504), and the annular gap between the variable diameter rod (800) and the inner wall of the through hole (504) forms a flow passage section.

3. The multi-stage constant tension traction winding device for a plastic straw fiber drawing machine according to claim 2, characterized in that, The variable diameter rod (800) includes a large diameter section (801) and a small diameter section (802). The large diameter section (801) is located in the lower half of the variable diameter rod (800), and the small diameter section (802) is located in the upper half of the variable diameter rod (800). Under normal conditions, the piston (502) is located in the position of the large diameter section (801).

4. The multi-stage constant tension traction winding device for a plastic straw fiber drawing machine according to claim 3, characterized in that, The small diameter segment (802) is configured as a tapered columnar structure that gradually decreases in size from bottom to top.

5. The multi-stage constant tension traction winding device for a plastic straw fiber drawing machine according to claim 2, characterized in that, The damping cylinder (5) has a detachable cover (7) at its closed end, and one end of the variable diameter rod (800) is fixed to the inner wall of the cover (7).

6. The multi-stage constant tension traction winding device for a plastic straw fiber drawing machine according to claim 1, characterized in that, The lifting assembly (202) includes a base plate (2021), a fixing plate (2022), a fixing frame (2023), and a lifting plate (2024). The base plate (2021) is fixedly installed, the fixing plate (2022) is fixed above the base plate (2021), the fixing frame (2023) is fixed to one side of the fixing plate (2022), and the lifting plate (2024) is slidably installed on the fixing frame (2023) via a slide rail assembly (4).

7. The multi-stage constant tension traction winding device for a plastic straw fiber drawing machine according to claim 6, characterized in that, The roller (201) is rotatably mounted on the lifting plate (2024) via bearings.

8. The multi-stage constant tension traction winding device for a plastic straw fiber drawing machine according to claim 1, characterized in that, The winding mechanism (1) includes a base (101), a mounting frame (102), a drive unit (103), and a winding roller (104). The mounting frame (102) is movably mounted above the base (101) via a slide rail, and the winding roller (104) is rotatably mounted on the mounting frame (102) via a bearing.

9. A multi-stage constant tension traction winding device for a plastic straw fiber drawing machine according to claim 6, characterized in that, The slide rail assembly (4) includes a track (402) and a slider (401). The slider (401) is fixed on the lifting plate (2024), the track (402) is fixed on the fixing frame (2023), and the slider (401) is slidably connected to the track (402), so that the lifting plate (2024) can move up and down along the track (402).

10. A multi-stage constant tension traction winding device for a plastic straw fiber drawing machine according to claim 3, characterized in that, The large-diameter section (801) and small-diameter section (802) of the variable-diameter rod (800) are configured to cooperate so that the piston (502) obtains a gradually decreasing damping force as the displacement increases during the upward process, so as to accelerate the relocation speed of the roller (201) to release the tension peak when the tension of the yarn (3) changes abruptly; and obtains a gradually increasing damping force as the displacement decreases during the downward process of the piston (502), so as to slow down the fall speed of the roller (201) when the tension recovers to avoid reverse impact.

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