Drawing frame drafting device with dynamic tension compensation mechanism

Abstract

The invention discloses a drawing frame drafting device with a dynamic tension compensation mechanism, and relates to the technical field of drawing frame sliver tension compensation, and the drawing frame drafting device comprises a drafting machine which is used as a rigid and functional bearing base body of the whole device, and the inner side wall of the drafting machine is provided with installation positions used for installing all functional assemblies; the rear end of the cradle is movably connected to the top of the drafting machine through a rotating shaft, the front end of the cradle can be locked or unlocked, and the cradle is used for supporting the drafting assembly and providing adjustable pressurizing pressure so as to press the roller and the gluing roller to form a jaw. The dynamic tension compensation mechanism is arranged in the rear drafting area, the tension of cotton slivers can be monitored and dynamically adjusted in real time through cooperative work of the contact piece and the intelligent control unit, the tension change caused by uneven feeding or drafting force fluctuation is effectively eliminated, and therefore it is guaranteed that the tension of fiber strands is constant in the drafting process; and the evenness and the product quality of the final cotton slivers are improved.

Description

Technical Field

[0001] This invention relates to the field of sliver tension compensation technology for drawing frames, specifically a drawing frame drafting device with a dynamic tension compensation mechanism. Background Technology

[0002] The drawing frame is a key piece of equipment in the spinning process. Its main task is to combine, draft, and comb the sliver output from the carding or combing machine to improve the unevenness of long segments of the sliver, make the fibers straighter and more parallel, and finally produce a finished sliver that meets the quality requirements for use in the next process. To achieve this process goal, the drawing frame is usually equipped with a drafting mechanism consisting of rollers and rubber rollers. It uses the difference in surface speed of the rollers to draw the sliver thinner. The back drafting zone is the pre-drafting zone, and the stability of its tension directly affects the drafting effect of the whole machine and the final yarn quality.

[0003] In actual production, due to the uneven thickness of the fed sliver and the differences in the characteristics of the raw fiber, dynamic tension fluctuations often occur in the drafting zone. However, the traditional method of adjusting with pressure rollers in existing technologies is relatively simple, only able to passively change the friction boundary of the sliver by applying pressure. It lacks the ability to actively adjust for tension fluctuations and a precise response mechanism, and cannot adaptively compensate according to the real-time state of the sliver. The limitations of this adjustment method make it difficult to effectively suppress drafting force fluctuations, which can easily lead to evenness deterioration and even "hard ends" or "sliver breakage," seriously restricting the production quality of high-grade yarns. Therefore, a drafting device for drawing frames with a dynamic tension compensation mechanism is needed to solve the shortcomings of the existing technology. Summary of the Invention

[0004] Technical problems to be solved Existing drafting devices, due to their simple adjustment methods and lack of dynamic adjustment capabilities, are unable to eliminate tension fluctuations generated during the post-drafting process of cotton slivers, resulting in damage to sliver quality.

[0005] Technical solution To achieve the above objectives, the present invention provides the following technical solution: a drafting device for a drawing frame with a dynamic tension compensation mechanism, comprising: The drawing machine, as the rigid and functional load-bearing base of the entire device, has mounting positions for installing various functional components on its inner side wall. The cradle, whose rear end is movably connected to the top of the drawing machine via a pivot, and whose front end can be locked or unlocked, is used to support the drawing assembly and provide adjustable pressure to clamp the roller and the top roller to form a jaw. The drafting mechanism is set in the working space formed by the drafting machine and the rocker frame. The drafting mechanism includes a rear roller, a middle roller and a front roller arranged in sequence along the movement trajectory of the sliver, and an upper rubber roller that is in a pressing fit with each roller, for the purpose of drafting and thinning the sliver. A dynamic tension compensation mechanism is provided in the rear drafting zone between the rear roller and the middle roller. It is used to apply dynamic tension and buffer control to the fed sliver to eliminate tension fluctuations during the drafting process. The intelligent control unit establishes an electrical connection with the dynamic tension compensation mechanism to receive sensor feedback signals in real time and accurately control the dynamic tension compensation mechanism to perform compensation actions accordingly.

[0006] Furthermore, the dynamic tension compensation mechanism includes: A pair of contact elements are disposed opposite each other in the rear stretching area for bonding the cotton sliver on both sides, forming a flexible clamping guide for the sliver; A pair of guide plates are securely fixed to the inside of the drawing machine, and the two contact elements are movably assembled between the guide plates. A tension adjusting element, disposed between the guide plates, is used to drive the two contact elements to move synchronously in opposite directions along the longitudinal direction, thereby changing the curvature of the sliver to adjust the tension on the sliver. A spacing control element is mounted on each of the guide plates to control the tension adjustment range by adjusting the horizontal spacing between the two contact elements.

[0007] Furthermore, the contact element includes: A receiving frame is slidably disposed between the guide plates, serving as a load-bearing base; A pair of contact arc plates are symmetrically and slidably built into the receiving frame. The swab passes through the channel formed between the two contact arc plates. The working surface of the contact arc plates adjacent to the swab is constructed as an arc-shaped surface and is made of polished stainless steel to minimize frictional resistance. The telescopic device is fixedly connected to the top inner wall and the bottom inner wall of the receiving frame. The telescopic rod end of the telescopic device is fixedly connected to the contact arc plate on the corresponding side, which is used to drive the two contact arc plates to move towards each other or away from each other to finely adjust the clamping gap. A high-sensitivity pressure sensor is embedded in the side of the contact arc plate adjacent to the cotton sliver, which is used to monitor the contact pressure in real time and dynamically calculate the tension of the cotton sliver.

[0008] Furthermore, the tension adjusting member includes: The movable frame, each guide plate has a pair of movable frames slidably connected to its inner side along the longitudinal direction, and the ends of the movable frames and the receiving frames are horizontally slidingly engaged, so that the receiving frames can move horizontally while following the movable frames to move longitudinally. A driving component, disposed within the space between the guide plates, is used to precisely control the longitudinal synchronous reverse movement of the two moving frames located on the same guide plate.

[0009] Furthermore, the driving element includes: A pair of synchronizing rods are rotatably mounted laterally between the guide plates; Movable components are correspondingly disposed on each of the guide plates. Two movable components work together to drive two movable frames on the corresponding guide plates to achieve synchronous reverse lifting and lowering.

[0010] Furthermore, the moving part includes: A pair of synchronizer pulleys are coaxially and fixedly connected to the ends of the upper and lower synchronizer rods, respectively; A synchronous belt is closedly wrapped around the two synchronous pulleys to form a closed-loop transmission structure. A connecting block is fixedly connected to one side of each of the movable frames adjacent to the synchronous belt, and the other end of the connecting block is fixedly connected to the belt body of the synchronous belt, for converting belt drive into linear driving force; Through the bidirectional cyclic rotation of the synchronous belt and the traction of the connecting block, the two moving frames located on the same side move synchronously in opposite directions along the longitudinal direction.

[0011] Furthermore, the tension adjusting element also includes: A servo motor is fixedly installed on the outer wall of the guide plate, and its output shaft is connected to the end of one of the synchronizing rods, serving as an independent power source for the tension adjusting component.

[0012] Furthermore, the spacing control element includes: Each of the receiving frames has a pull rod slidably connected to its end in the horizontal direction. The pull rod is constructed in an L-shape, and its horizontal movement does not interfere with the longitudinal displacement of the receiving frame, while it can push the receiving frame to move horizontally along the moving frame. A linkage component, mounted on the guide plate, is used to drive the two pull rods to perform horizontal movements toward each other or backward movements.

[0013] Furthermore, the linkage component includes: The guide frame is fixedly connected to the inner side of the guide plate, serving as a mounting base; The gear is rotatably supported inside the guide frame via a rotating shaft; A pair of racks are slidably disposed inside the guide frame in the horizontal direction, and the gear meshes between the two racks to form a rack and pinion pair; Wherein, the end of the rack away from the guide frame is fixedly connected to the end of the pull rod; The forward and reverse rotation of the gears drives the two racks to move synchronously in opposite directions, thereby forcing the two pull rods to move their corresponding contact parts closer together or separate from each other.

[0014] Furthermore, a second servo motor is fixedly connected to the outer side of the guide plate, and its output shaft is connected to the rotating shaft of one of the gears to provide precise rotational power for the spacing adjustment.

[0015] Compared with the prior art, the drafting device of the drawing frame with dynamic tension compensation mechanism has the following advantages: I. This invention, by setting a dynamic tension compensation mechanism in the rear drafting zone, utilizes the collaborative work of the contact component and the intelligent control unit to monitor and dynamically adjust the tension of the sliver in real time, effectively eliminating tension changes caused by uneven feeding or fluctuations in drafting force, thereby ensuring the constant tension of the sliver during the drafting process and improving the evenness and product quality of the final sliver.

[0016] Second, this invention employs a servo motor in conjunction with a synchronous belt, synchronous pulley, and synchronous rod in the tension adjustment component to drive two contact parts to move synchronously in opposite directions along the longitudinal direction. This precisely changes the curvature and path length of the cotton sliver, achieving rapid, stable, and accurate compensation for the tension of the cotton sliver, thus avoiding the problem of large lag in traditional mechanical adjustment methods.

[0017] Third, by setting a spacing control component, the present invention utilizes a servo motor to drive a rack and pinion mechanism to move a pull rod, which can flexibly adjust the horizontal spacing between two contact components, thereby changing the sensitivity range and range of tension compensation. This allows the same equipment to meet the production needs of different varieties and materials of yarn through simple adaptation, improving the versatility and process adaptability of the device. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the drawing machine of the present invention; Figure 4 This is a schematic diagram of the dynamic tension compensation mechanism of the present invention; Figure 5 This is a schematic diagram of the exploded structure of the dynamic tension compensation mechanism of the present invention; Figure 6 This is a schematic diagram of the contact structure of the present invention; Figure 7 This is a schematic diagram of the tension adjustment component and the spacing control component of the present invention; Figure 8 For the present invention Figure 7 Another perspective structural diagram Figure 9 This is a schematic diagram of the spacing control component of the present invention.

[0019] In the diagram: 1. Drawing machine; 2. Cradle; 3. Rear roller; 4. Middle roller; 5. Front roller; 6. Top roller; 7. Contact element; 701. Receiving frame; 702. Contact arc plate; 703. Expansion joint; 8. Guide plate; 9. Tension adjusting element; 901. Moving frame; 902. Synchronizing rod; 903. Synchronizing pulley; 904. Synchronizing belt; 905. Connecting block; 906. Servo motor one; 10. Spacing control element; 1001. Tie rod; 1002. Guide frame; 1003. Gear; 1004. Rack; 11. Servo motor two. 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] like Figure 1-9 As shown, the present invention provides a technical solution: a drawing frame drafting device with a dynamic tension compensation mechanism. This device is installed as a whole in the production line of the drawing frame and mainly consists of a drafting machine 1, a cradle 2, the drafting machine 1 assembly, a dynamic tension compensation mechanism, and an intelligent control unit. The drafting machine 1 serves as the rigid and functional support base of the entire device. Its inner side wall is provided with mounting positions for various functional components. A rotating shaft is provided at the top of the drafting machine 1, and the rear end of the cradle 2 is movably connected to the top of the drafting machine 1 through this rotating shaft. A locking mechanism is provided at the front end of the cradle 2, allowing for locking or unlocking. In the working state, the cradle 2 locks and supports the drafting assembly, providing adjustable pressure to firmly press the top roller 6 onto the roller, forming a strong jaw to grip the sliver for drafting. When cleaning or maintenance is required, the cradle 2 can be unlocked and lifted. The core advantage of this device lies in the real-time and dynamic compensation of the sliver tension through the dynamic tension compensation mechanism, effectively eliminating tension fluctuations.

[0022] The drafting machine 1 is set within the working space formed by the drafting machine 1 and the cradle 2. It mainly includes a rear roller 3, a middle roller 4, and a front roller 5 arranged sequentially along the sliver movement trajectory, as well as an upper rubber roller 6 that is pressurized by the cradle 2 and forms a pressing fit with each roller. To ensure the accuracy of the drafting movement, each roller is connected to an independent drive source, specifically a main motor and a transmission gearbox 1003 configured inside the drafting machine 1 housing. The main motor is connected to the gearbox 1003 via a drive shaft, and the gearbox 1003 distributes the power and transmits it precisely to the rear roller 3, the middle roller 4, and the front roller 5. At the shaft end, each roller is controlled to rotate according to a preset speed ratio. By utilizing the difference in linear velocity of each pair of roller surfaces, the sliver is drawn and thinned. In addition, to ensure the stability of the drawing process, this device is also equipped with a roller cleaning component (not shown in the figure) in the drawing area. This component is usually installed on the side of the top roller 6 or roller and includes a reciprocating cleaning scraper or a rotating lint belt to remove cotton wax, short fibers and dust adhering to the surface of the top roller 6 and roller in real time. This prevents these impurities from entering the drawing nip and causing uneven sliver or roller entanglement, and ensures the stability of the friction coefficient during the drawing process.

[0023] The dynamic tension compensation mechanism is the core of this device. It is located in the rear drafting zone between the rear roller 3 and the middle roller 4. It is used to apply dynamic tension and buffer control to the fed sliver. The compensation mechanism mainly includes a pair of contact elements 7, a pair of guide plates 8, a tension adjusting element 9, and a spacing control element 10. The pair of guide plates 8 are firmly fixed to the inside of the drafting machine 1. The pair of contact elements 7 are arranged opposite each other in the rear drafting zone. They are used to attach the sliver on both sides to form a flexible clamping guide for the sliver. They are all movably assembled between the two guide plates 8.

[0024] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, specifically, the contact element 7 includes a receiving frame 701 and contact arc plates 702. The receiving frame 701 is slidably disposed between the guide plates 8, serving as a load-bearing base. A pair of contact arc plates 702 are symmetrically and slidably built into the receiving frame 701. The cotton sliver passes through the channel formed between the two contact arc plates 702. In terms of structural design, the relative distance between the two contact arc plates 702 in the longitudinal direction can be set according to actual needs. The greater the longitudinal distance between the two pairs of contact arc plates 702, the larger the contact area between each contact arc plate 702 and the cotton sliver. This design has significant beneficial effects: on the one hand, a larger contact area means a reduction in specific pressure per unit area, which can effectively avoid damage to the surface of the cotton sliver fibers due to excessive local pressure, making it particularly suitable for protecting delicate or fragile fiber materials; on the other hand, the increased contact area enhances the enveloping ability of the friction interface, making the cotton sliver more stable during operation and less prone to shaking or accidental slippage, thereby significantly improving the stability of tension control and transmission efficiency.

[0025] To minimize frictional damage to the tampon, the working surface of the contact arc plate 702 adjacent to the tampon is constructed as an arc-shaped surface and made of polished stainless steel. To accommodate tampons of different widths and maintain optimal contact, a pair of telescopic devices 703 are fixedly connected to the top and bottom inner walls of the receiving frame 701. The telescopic rod ends of the telescopic devices 703 are fixedly connected to the corresponding side of the contact arc plate 702, which can drive the two contact arc plates 702 to move towards or away from each other, thereby finely adjusting the clamping gap. In addition, a high-sensitivity pressure sensor (not shown in the figure) is embedded in the side of the contact arc plate 702 adjacent to the tampon to monitor the contact pressure in real time to calculate the tension. To ensure the straightness of the movement of the contact arc plate 702, guide blocks are extended and fixedly connected to both ends of the contact arc plate 702. At the same time, guide grooves are correspondingly opened on the inner side walls of the receiving frame 701, and the guide blocks and guide grooves form a sliding clearance fit.

[0026] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 7 and Figure 8 As shown, the tension adjusting component 9 is disposed between the guide plates 8 and is used to drive the two contact pieces 7 to move synchronously in opposite directions along the longitudinal direction, thereby changing the curvature of the cotton swab to adjust the tension of the cotton swab. The tension adjusting component 9 mainly includes a moving frame 901 and a driving component. A pair of moving frames 901 are slidably connected along the longitudinal direction on the inner side of each guide plate 8. The moving frames 901 and the end of the receiving frame 701 form a horizontal sliding fit. This design allows the receiving frame 701 to still follow the moving frames 901 to perform longitudinal tension adjustment movement when moving horizontally. The driving component is used to precisely control the two moving frames 901 located on the same guide plate 8 to move synchronously in opposite directions along the longitudinal direction.

[0027] The specific structure of the drive component includes a pair of rotatable synchronous rods 902 horizontally mounted between guide plates 8, and a moving component correspondingly mounted on each guide plate 8. The moving component includes a pair of synchronous pulleys 903, which are coaxially fixedly connected to the ends of the upper and lower synchronous rods 902 respectively. A synchronous belt 904 is closedly wrapped around the two synchronous pulleys 903 to form a closed-loop transmission structure. Each moving frame 901 has a connecting block 905 fixedly connected to one side of the synchronous belt 904. The other end of the connecting block 905 is fixedly connected to the belt body of the synchronous belt 904. When the synchronous belt 904 rotates, it is pulled by the connecting block 905, causing the two moving frames 901 on the same side to move synchronously in opposite directions in the longitudinal direction. In order to provide power, the tension adjusting component 9 also includes a servo motor 906 fixedly mounted on the outer wall of the guide plate 8. Its output shaft is connected to the end of one of the synchronous rods 902 as an independent power source.

[0028] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 7 , Figure 8 and Figure 9 As shown, the spacing control component 10 is used to adjust the horizontal distance between the two contact components 7 according to process requirements, thereby changing the sensitivity range of tension compensation. It includes a pull rod 1001 and a linkage component. The end of each receiving frame 701 is slidably connected to the pull rod 1001 in the horizontal direction. The pull rod 1001 is constructed into an L-shaped structure. Its horizontal movement does not interfere with the longitudinal displacement of the receiving frame 701, while it can push the receiving frame 701 to move horizontally along the moving frame 901. The linkage component is set on the guide plate 8 and is used to drive the two pull rods 1001 to perform horizontal opposite movement or back-to-back movement.

[0029] The specific implementation of the linkage is as follows: It includes a guide frame 1002 fixedly connected to the inner side of the guide plate 8, serving as a mounting base; a gear 1003 rotatably supported on the inner side of the guide frame 1002 via a rotating shaft; a pair of racks 1004 slidably disposed on the inner side of the guide frame 1002 in the horizontal direction, with the gear 1003 meshing between the two racks 1004, forming a gear 1003 and rack 1004 pair. The ends of the racks 1004 away from the guide frame 1002 are fixedly connected to the ends of the pull rods 1001. To drive the mechanism, a servo motor 11 is fixedly connected to the outer side of the guide plate 8, its output shaft being connected to the rotating shaft of the gear 1003 to provide rotational power, driving the gear 1003 via the servo motor 11. Rotation of 003 causes the two racks 1004 to move synchronously in opposite directions, thereby forcing the two pull rods 1001 to move the corresponding contact parts 7 towards each other or apart. The beneficial effect of this spacing control part 10 is that it gives the device a strong process adaptability. By simply adjusting the horizontal spacing of the contact parts 7, the bending radius and path length of the sliver in the compensation zone can be changed, thereby flexibly setting the tension adjustment range (i.e., range). When processing fine yarn or varieties with small tension fluctuations, the spacing is reduced to achieve high-precision micro-adjustment; when processing coarse yarn or when the raw material fluctuates violently, the spacing is increased to provide a large-scale tension buffer. This design allows the same equipment to perfectly adapt to various spinning conditions, greatly improving the versatility and production efficiency of the equipment.

[0030] The intelligent control unit establishes an electrical connection with the dynamic tension compensation mechanism. This unit uses a high-performance industrial-grade microprocessor as its core, integrating a signal acquisition module, a motion control module, and a human-machine interface. During operation, the intelligent control unit first receives millisecond-level tension data streams from the pressure sensor embedded in the contact arc plate 702 in real time via a high-speed data bus. Its internally integrated adaptive PID algorithm quickly calculates and processes the input voltage or current signal according to the preset tension range and target value. Subsequently, the intelligent control unit sends precise speed and direction commands to servo motor 906 through a multi-channel pulse modulation output port, driving the tension adjustment component 9 to perform longitudinal dynamic compensation. At the same time, based on the optimal parameters retrieved from the spinning process database, it sends position control commands to servo motor 11, driving the spacing control component 10 to set the lateral range. In addition, the intelligent control unit also has self-diagnosis and overload protection functions. Once it detects that the tension data is abnormally exceeded by the safety threshold, it will immediately trigger an emergency stop signal and alarm to ensure the safe and stable operation of the entire system.

[0031] Working process: First, the cotton sliver is output from the previous process and fed into the drafting zone of this device as either raw or wrought sliver. The cotton sliver first enters the rear nip formed by the rear roller 3 and the corresponding upper roller 6. Subsequently, the cotton sliver enters the rear drafting zone between the rear roller 3 and the middle roller 4. Here, the dynamic tension compensation mechanism intervenes. The cotton sliver passes between two opposing contact pieces 7. The contact arc plate 702 on the contact piece 7, driven by the telescoping device 703, adheres to both sides of the cotton sliver with appropriate pressure. The intelligent control unit receives real-time data from the pressure sensor on the contact arc plate 702. When tension fluctuation is detected, the control servo motor 906 is started, driving the synchronous rod 902, synchronous wheel 903, and synchronous belt 904 to rotate. This causes the moving frame 901 to move longitudinally along the guide plate 8. The movement of the moving frame 901 causes the contact piece 7 to rise and fall, changing the curvature and path length of the cotton sliver, thereby adjusting the tension of the cotton sliver. The sliver tension is compensated in real time. Simultaneously, depending on the yarn type, the intelligent control unit controls the servo motor 11 to rotate. Through the meshing transmission of gear 1003 and rack 1004, the pull rod 1001 is driven to move horizontally, adjusting the horizontal distance between the two contact parts 7, thereby setting the tension adjustment range. After the tension compensation stabilizes the sliver, it continues to move forward and enters the middle nip formed by the middle roller 4 and the corresponding top roller 6, and the front nip formed by the front roller 5 and the corresponding top roller 6. Since the surface linear velocity of the front roller 5 is set to be higher than that of the middle roller 4 and the middle roller 4 is higher than that of the rear roller 3, the sliver is gradually stretched and thinned under the grip of these three nipples, and finally output at high speed from the front end of the front roller 5 to form a sliver that meets the yarn evenness requirements, and enters the next process of sliver coiling or twisting. The whole process forms a closed-loop control, ensuring constant draft tension and effectively improving yarn evenness.

[0032] 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 drafting device for a drawing frame with a dynamic tension compensation mechanism, characterized in that, include: The drawing machine (1), as the rigid and functional load-bearing base of the whole device, has mounting positions for installing various functional components on its inner side wall; The cradle (2) is movably connected at its rear end to the top of the drawing machine (1) via a pivot shaft, and its front end can be locked or unlocked. It is used to support the drawing assembly and provide adjustable pressure to clamp the roller and the top roller (6) to form a jaw. The drafting machine (1) is set in the working space formed by the drafting machine (1) and the cradle (2). The drafting machine (1) includes a rear roller (3), a middle roller (4) and a front roller (5) arranged in sequence along the movement trajectory of the sliver, and an upper rubber roller (6) that is in a pressing fit with each roller, for the purpose of stretching and thinning the sliver. A dynamic tension compensation mechanism is provided in the rear drafting zone between the rear roller (3) and the middle roller (4) to apply dynamic tension and buffer control to the fed sliver, so as to eliminate tension fluctuations during the drafting process. The intelligent control unit establishes an electrical connection with the dynamic tension compensation mechanism to receive sensor feedback signals in real time and accurately control the dynamic tension compensation mechanism to perform compensation actions accordingly.

2. The drafting device for a drawing frame with a dynamic tension compensation mechanism according to claim 1, characterized in that, The dynamic tension compensation mechanism includes: A pair of contact elements (7) are disposed opposite to each other in the rear stretching area for bonding cotton strips on both sides to form a flexible clamping guide for the sliver; A pair of guide plates (8) are securely fixed to the inside of the drawing machine (1), and the two contact pieces (7) are movably assembled between the guide plates (8); Tension adjustment element (9) is disposed between the guide plates (8) and is used to drive the two contact elements (7) to move synchronously in opposite directions along the longitudinal direction, thereby changing the curvature of the cotton sliver to adjust the tension of the cotton sliver; A spacing control element (10) is mounted on each of the guide plates (8) for controlling the size of the tension adjustment range by adjusting the horizontal spacing between the two contact elements (7).

3. A drafting device for a drawing frame with a dynamic tension compensation mechanism according to claim 2, characterized in that, The contact (7) includes: A receiving frame (701) is slidably disposed between the guide plates (8) as a load-bearing base; A pair of contact arc plates (702) are symmetrically and slidably built into the receiving frame (701), the cotton strip passes through the channel formed between the two contact arc plates (702), the working surface of the contact arc plates (702) adjacent to the cotton strip is constructed as an arc surface, and is made of polished stainless steel to minimize frictional resistance. The telescopic device (703) is fixedly connected to the top inner wall and the bottom inner wall of the receiving frame (701). The telescopic rod end of the telescopic device (703) is fixedly connected to the contact arc plate (702) on the corresponding side, and is used to drive the two contact arc plates (702) to move towards each other or away from each other to finely adjust the clamping gap. The contact arc plate (702) is embedded with a high-sensitivity pressure sensor on the side adjacent to the cotton strip, which is used to monitor the contact pressure in real time and dynamically calculate the tension of the cotton strip.

4. A drafting device for a drawing frame with a dynamic tension compensation mechanism according to claim 3, characterized in that, The tension adjusting element (9) includes: The movable frame (901) is slidably connected to the inner side of each guide plate (8) along the longitudinal direction. The movable frame (901) and the end of the receiving frame (701) form a horizontal sliding fit, so as to allow the receiving frame (701) to move longitudinally along the movable frame (901) while moving horizontally. A drive unit is disposed in the space between the guide plates (8) for precisely controlling the longitudinal synchronous reverse movement of the two moving frames (901) located on the same guide plate (8).

5. A drafting device for a drawing frame with a dynamic tension compensation mechanism according to claim 4, characterized in that, The driving component includes: A pair of synchronizing rods (902) are rotatably mounted laterally between the guide plates (8); The movable components are respectively set on each of the guide plates (8), and the two movable components work together to drive the two movable frames (901) on the corresponding guide plates (8) to achieve synchronous reverse lifting and lowering.

6. A drafting device for a drawing frame with a dynamic tension compensation mechanism according to claim 5, characterized in that, The movable component includes: A pair of synchronous pulleys (903) are coaxially fixedly connected to the ends of the upper and lower synchronous rods (902); A synchronous belt (904) is closedly wrapped around the two synchronous pulleys (903) to form a closed-loop transmission structure; A connecting block (905) is fixedly connected to one side of each of the moving frames (901) adjacent to the synchronous belt (904), and the other end of the connecting block (905) is fixedly connected to the belt body of the synchronous belt (904) to convert belt drive into linear driving force. By means of the bidirectional cyclic rotation of the synchronous belt (904), and the traction of the connecting block (905), the two moving frames (901) located on the same side move synchronously in opposite directions along the longitudinal direction.

7. A drafting device for a drawing frame with a dynamic tension compensation mechanism according to claim 5, characterized in that, The tension adjusting element (9) further includes: Servo motor 1 (906) is fixedly installed on the outer side wall of the guide plate (8), and its output shaft is connected to the end of one of the synchronous rods (902) as an independent power source for the tension adjustment member (9).

8. A drafting device for a drawing frame with a dynamic tension compensation mechanism according to claim 5, characterized in that, The spacing control element (10) includes: A pull rod (1001) is slidably connected to the end of each of the receiving frames (701) in the horizontal direction. The pull rod (1001) is constructed in an L-shape. Its horizontal movement does not interfere with the longitudinal displacement of the receiving frame (701), while it can push the receiving frame (701) to move horizontally along the moving frame (901). A linkage component is provided on the guide plate (8) for driving the two pull rods (1001) to perform horizontal opposite movement or back-to-back movement.

9. A drafting device for a drawing frame with a dynamic tension compensation mechanism according to claim 8, characterized in that, The linkage component includes: The guide frame (1002) is fixedly connected to the inner side of the guide plate (8) as a mounting base; The gear (1003) is rotatably supported inside the guide frame (1002) via a rotating shaft; A pair of racks (1004) are slidably disposed inside the guide frame (1002) in the horizontal direction, and the gear (1003) meshes between the two racks (1004) to form a gear (1003) rack (1004) pair; Wherein, the end of the rack (1004) away from the guide frame (1002) is fixedly connected to the end of the pull rod (1001); The forward and reverse rotation of the gear (1003) drives the two racks (1004) to move synchronously in opposite directions, thereby forcing the two pull rods (1001) to drive the corresponding contact parts (7) to move closer together or separate from each other.

10. A drafting device for a drawing frame with a dynamic tension compensation mechanism according to claim 9, characterized in that, A servo motor (11) is fixedly connected to the outside of the guide plate (8), and its output shaft is connected to the rotating shaft of one of the gears (1003) to provide precise rotational power for the spacing adjustment.

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