Thick and thin paper tension stabilizing traction device

Abstract

The invention discloses a thin and thick paper tension stabilizing traction device, which relates to the technical field of paper traction, and comprises a bearing frame, a paper feeding roller, a threaded paper spreading and passing roller, a tension roller and a tension sensor, a swing mechanism is arranged in the bearing frame and comprises an air cylinder displacement sensor, an ultra-low friction swing rod air cylinder, a swing roller, a swing roller force arm, a swing roller balance weight rod, a low-tension position hole and a high-tension position hole, the low-tension position hole and the high-tension position hole are formed in the side edge of the swing roller force arm, and the swing roller and the swing roller balance weight rod are installed on the side edge of the swing roller force arm. Paper flattening is achieved by means of thread structures of the thread paper unfolding and passing roller and the paper feeding roller, and initial tension of different pieces of paper is accurately detected in cooperation with a tension sensor. Through the combination of the swing roller balance weight lever, the ultralow friction swing rod cylinder and the low / high tension position hole, the tension can be flexibly adjusted to adapt to different characteristics of thick paper and thin paper, and the problem that the tension of the thick paper is insufficient or the thin paper is excessively stretched is solved.

Description

Technical Field

[0001] This invention relates to the field of paper traction technology, specifically to a force-stabilizing traction device for thick and thin paper. Background Technology

[0002] In the paper printing and packaging production field, especially in the printing-cutting / rewinding process of the outer packaging printing line, the paper path usually needs to go through multiple processes such as unwinding, printing, embossing, coding, inspection, correction, cutting / rewinding, etc. Existing production lines generally have two key technical shortcomings: one is the lack of targeted tension stabilization and control devices, and the other is the long paper path, which is prone to insufficient power supply. The invention disclosed in application number CN202311782370.0 is a highly stable conveying device for transparent paper of different thicknesses. The device includes a base plate, on the top of which are two sets of fixed plates arranged in pairs. One set of fixed plates is equipped with a drive motor, the output of which is connected to a conveyor belt. Two support plates are fixed on the base plate between the two adjacent fixed plates. The support plates are connected to a connecting box through an adjustment component. The technical principle of this solution is as follows: relying on the coordinated linkage of the connecting box, connecting slide, connecting rod, first linkage plate and second linkage plate, when conveying transparent paper of different thicknesses, the height change of the sensing plate caused by the difference in paper thickness drives the drive box to drive the pressure roller to rise and fall accordingly to adjust its position, thereby changing the pressure of the pressure roller on the transparent paper, thus avoiding damage to the transparent paper due to excessive pressure of the pressure roller and reducing material waste. However, this technical solution has obvious limitations: First, it only adapts to the conveying needs of transparent paper of different thicknesses by adjusting the pressure, without considering the difference in tension requirements corresponding to the difference in elongation of thick and thin paper. For conveying thick paper (such as multi-layer transparent paper stacks), it is very easy to cause paper wrinkles due to insufficient tension. Second, the power conveying relies only on the basic driving force of the conveyor belt and does not have a dedicated traction roller structure. During the long paper conveying process, the tension attenuation phenomenon is significant and cannot match the power requirements of the printing-cutting / winding process, ultimately resulting in poor overall conveying stability. Based on this, this solution proposes "a force-stabilizing traction device for thick and thin paper" to solve the above problems. Summary of the Invention

[0003] The purpose of this invention is to provide a tension stabilization device for thick and thin paper to solve the problem mentioned in the background art that existing devices on the market do not have a tension adjustment mechanism.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a force stabilizing traction device for thick and thin paper, comprising a support frame, a feed roller, a threaded paper spreading roller, a tension roller, and a tension sensor; The support frame is installed on the side of the coupling, and the coupling is located on the side of the traction main roller; The support frame is equipped with a swing mechanism, which includes a cylinder displacement sensor, an ultra-low friction swing rod cylinder, a swing roller, a swing roller lever arm, a swing roller counterweight rod, a low tension position hole, and a high tension position hole. The low tension position hole and the high tension position hole are located on the side of the swing roller lever arm. The swing roller and the swing roller counterweight rod are installed on the side of the lever arm. The cylinder displacement sensor and the ultra-low friction swing rod cylinder are installed below the lever arm.

[0005] As a preferred technical solution of the present invention, the right side of the support frame is rotatably connected to the paper feed roller, the surface of the paper feed roller is formed with a threaded structure, a tension roller is arranged parallel above the paper feed roller, a tension sensor is arranged on the side of the tension roller and the connection end of the support frame, and a threaded paper spreading and paper passing roller is rotatably connected to the inner wall of the support frame, and the threaded paper spreading and paper passing roller has the same structure as the paper feed roller. Using the above technical solution, both the feed roller and the threaded paper spreading roller adopt a threaded structure, which can generate a lateral flattening force on the paper during paper feeding, effectively eliminating wrinkles and edge curling, avoiding paper deviation, and providing a flat paper path for subsequent tension control. Moreover, the consistent structure of the two ensures a uniform flattening effect. The tension roller, which is arranged parallel above the feed roller, fully fits the paper. Together with the tension sensor on the side, it can capture the initial tension data of different thicknesses of paper in real time, providing a precise basis for subsequent adjustment, avoiding loss of control caused by initial tension fluctuations, and adapting to the tension detection needs of various types of paper.

[0006] As a preferred technical solution of the present invention, the top of the support frame is bolted to the swing arm anti-collision pad, the swing arm anti-collision pad is a right-angled trapezoidal structure with two pads fixed by an L-shaped bracket, the inner wall of the support frame is rotatably connected to the traction main roller, and the shaft end of the traction main roller is fixedly connected to the coupling. Using the above technical solution, the two right-angled trapezoidal swing arm anti-collision pads fixed to the top of the support frame by L-shaped bracket bolts can accurately limit the maximum swing amplitude of the swing arms, avoid hard collisions between the swing arms and the support frame, protect the core components such as the swing arms and swing rollers, extend the equipment life and facilitate disassembly and maintenance; the traction main roller shaft end is fixedly connected to the coupling to ensure efficient and stable power transmission, avoid speed fluctuations, provide continuous power for the excessively long paper path between printing-cutting large sheets / rewinding, solve the problem of tension attenuation caused by insufficient power in the existing paper path, and further ensure tension stability.

[0007] As a preferred embodiment of the present invention, the inner wall of the support frame is rotatably connected to the swing roller arm, one side of the swing roller arm is fixedly connected to the swing roller counterweight rod, and the other side of the swing roller arm is rotatably connected to the swing roller. The inner wall of the swing roller arm is provided with low-tension holes and high-tension holes, which are distributed in parallel, with the low-tension holes close to the centerline of the swing roller arm. The swing roller arm is rotatably connected to the ultra-low friction swing rod cylinder through the low-tension holes or the high-tension holes. The side of the ultra-low friction swing rod cylinder is fixedly connected to the cylinder displacement sensor. The ultra-low friction swing rod cylinder is rotatably connected to the support frame, and there are two ultra-low friction swing rod cylinders symmetrically distributed. The pneumatic circuit of the ultra-low friction swing rod cylinder synchronously controls the swing roller arm as a rigid synchronous beam to ensure synchronous drive. Using the above technical solution, the counterweight rod of the swing roller works in conjunction with the ultra-low friction swing arm cylinder to flexibly adjust the tension of the swing arm according to the characteristics of thick and thin paper. Thick paper can meet the high tension requirements by increasing the counterweight, while thin paper can reduce the counterweight to avoid excessive stretching, thus achieving personalized adaptation. The low-tension and high-tension holes opened in the swing roller arm form a clear zone. Switching the cylinder connection hole position can complete the production conversion of thick and thin paper, shortening the changeover time. The two symmetrically distributed ultra-low friction swing arm cylinders are synchronously controlled by the pneumatic circuit. The ultra-low friction design improves the response speed. With the cylinder displacement sensor, the position of the swing roller is detected in real time to form a closed-loop adjustment, eliminating paper expansion and contraction errors. At the same time, the swing roller arm acts as a rigid synchronous beam to ensure synchronous swing on both sides, ensuring uniform lateral tension of the paper path and solving the problems of unstable winding tension and large and small sheets when cutting paper.

[0008] As a preferred technical solution of the present invention, the inner wall surface of the support frame is provided with a paper pressing mechanism, the paper pressing mechanism includes a paper pressing roller, a paper pressing arm, and a paper pressing cylinder, the paper pressing arm is rotatably connected to the support frame, the paper pressing roller is rotatably connected above the paper pressing arm, the paper pressing cylinder is rotatably connected below the paper pressing arm, and the paper pressing cylinder is rotatably connected to the support frame; Using the above technical solution, in the paper pressing mechanism on the inner wall of the support frame, the paper pressing arm is rotatably connected to the support frame and the paper pressing cylinder. The paper pressing cylinder drives the paper pressing arm to drive the paper pressing roller to flexibly press the paper. The pressing force can be flexibly adjusted according to the thickness of the paper. For thick paper, the pressure is increased to ensure traction stability, and for thin paper, the pressure is reduced to avoid damage. This ensures both traction stability and protects the surface quality of the paper. The paper pressing roller can adapt to slight changes in the paper's position and always maintain a stable pressing force to prevent the paper from slipping. This ensures effective transmission of power to the main traction roller and guarantees continuous and stable paper tension, providing support for the accuracy of subsequent large sheet cutting / rewinding.

[0009] Compared with the prior art, the beneficial effects of the present invention are: 1. High adaptability, catering to both thick and thin paper needs: The paper is flattened by the threaded structure of the threaded paper feeding roller and the paper feed roller, and the tension sensor accurately detects the initial tension of different papers; the tension can be flexibly adjusted by the combination of the swing roller counterweight rod, the ultra-low friction swing rod cylinder and the low / high tension position hole, adapting to the different characteristics of thick and thin papers, avoiding the problem of insufficient force for thick paper or excessive stretching of thin paper.

[0010] 2. Stable tension, solving core production pain points: The stable transmission between the traction main roller and the coupling provides continuous power for excessively long paper paths. The cylinder displacement sensor and the swing roller form a "detection-feedback-adjustment" closed loop to quickly compensate for minor paper elongation errors. The flexible pressing design of the paper pressing mechanism prevents paper slippage and ensures effective power transmission, completely solving the problems of unstable tension between printing and cutting large sheets / rewinding, and the occurrence of large and small sheets when cutting paper, thus ensuring production accuracy.

[0011] 3. Protect equipment and reduce maintenance costs: The swing arm anti-collision pad precisely limits the swing arm's swing amplitude, avoiding hard collisions with core components and extending equipment life; most components adopt bolt fixing and rotating connection structures, which are easy to disassemble and replace, reducing maintenance difficulty and cost.

[0012] 4. Improve efficiency and optimize production process: The tension zone design allows for quick switching between thick and thin paper production modes without replacing core components, shortening changeover time; the integrated design of paper path flattening, tension detection, and traction drive ensures a smooth and continuous production process, improving overall production efficiency and product consistency. Attached Figure Description

[0013] Figure 1 This is a side view of the structure of the present invention; Figure 2 This is a schematic diagram of the paper output roller and paper pressing mechanism of the present invention; Figure 3 This is a schematic diagram of the right-side structure of the present invention; Figure 4 This is a side view of the swing mechanism of the present invention. Figure 5 This is a schematic diagram of the paper movement path in this invention; Figure 6 This is a schematic diagram of the structure of the paper feed roller and the threaded paper spreading roller of the present invention; Figure 7 This is a schematic diagram of the swing arm anti-collision pad and traction main roller structure of the present invention; Figure 8 This is a schematic diagram of the paper pressing roller and paper pressing lever arm structure of the present invention; Figure 9 This is a schematic diagram of the low-tension and high-tension hole structures of the present invention; Figure 10 This is a schematic diagram illustrating the working principle of the present invention.

[0014] In the diagram: 1. Support frame; 2. Feed roller; 3. Threaded paper feeding roller; 4. Tension roller; 5. Swing mechanism; 6. Cylinder displacement sensor; 7. Ultra-low friction swing arm cylinder; 8. Coupling; 9. Output roller; 10. Paper pressing mechanism; 11. Swing arm anti-collision pad; 12. Traction main roller; 13. Paper pressing roller; 14. Paper pressing lever arm; 15. Paper pressing cylinder; 16. Swing roller; 17. Swing roller lever arm; 18. Swing roller counterweight rod; 19. Low tension position hole; 20. High tension position hole; 21. Tension sensor. Detailed Implementation

[0015] 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.

[0016] Please see Figure 1-10 The technical solution of this invention is as follows: a traction device for stabilizing the force of thick and thin paper; comprising a support frame 1, a paper feed roller 2, a threaded paper spreading roller 3, a tension roller 4, a swing mechanism 5, a cylinder displacement sensor 6, an ultra-low friction swing arm cylinder 7, a coupling 8, a paper output roller 9, a paper pressing mechanism 10, a swing arm anti-collision pad 11, a traction main roller 12, a paper pressing roller 13, a paper pressing force arm 14, a paper pressing cylinder 15, a swing roller 16, a swing roller force arm 17, a swing roller counterweight rod 18, a low tension position hole 19, a high tension position hole 20, and a tension sensor 21; The support frame 1 is installed on the side of the coupling 8, and the coupling 8 is located on the side of the traction main roller 12; The support frame 1 is equipped with a swing mechanism 5, which includes a cylinder displacement sensor 6, an ultra-low friction swing rod cylinder 7, a swing roller 16, a swing roller lever arm 17, a swing roller counterweight rod 18, a low tension position hole 19, and a high tension position hole 20. The low tension position hole 19 and the high tension position hole 20 are located on the side of the swing roller lever arm 17. The swing roller 16 and the swing roller counterweight rod 18 are installed on the side of the swing roller lever arm 17. The cylinder displacement sensor 6 and the ultra-low friction swing rod cylinder 7 are installed below the roller lever arm 17.

[0017] The right side of the support frame 1 is rotatably connected to the feed roller 2, which has a threaded surface. A tension roller 4 is arranged parallel above it, and a tension sensor 21 is installed at the connection end between the tension roller 4 and the support frame 1. The inner wall of the support frame 1 is rotatably connected to the threaded paper spreading roller 3, which has the same structure as the feed roller 2. The threaded structure of the feed roller 2 and the threaded paper spreading roller 3 can form a lateral flattening force when the paper is fed, effectively eliminating wrinkles and edge curling, preventing paper deviation, and laying a flat paper path foundation for subsequent tension control. The unified structure of the two ensures a consistent flattening effect. The tension roller 4 is fully in contact with the paper, and with the side tension sensor 21, it can capture different initial tension data of thick and thin paper in real time, providing accurate reference for subsequent adjustment, avoiding the loss of control caused by initial tension fluctuations, and adapting to the tension detection needs of various types of paper. Two right-angled trapezoidal swing arm anti-collision pads 11 are fixed to the top of the support frame 1 by L-shaped bracket bolts; the inner wall of the support frame 1 is rotatably connected to the traction main roller 12, and the shaft end of the traction main roller 12 is fixedly connected to the coupling 8. The two right-angled trapezoidal swing arm anti-collision pads 11 can precisely limit the maximum swing amplitude of the swing arm, avoid hard collision between the swing arm and the support frame 1, thereby protecting the swing arm, swing roller 16 and other core components, extending the service life of the equipment, and the bolt fixing method facilitates the disassembly and maintenance of the anti-collision pads; the fixed connection between the traction main roller 12 and the coupling 8 can ensure efficient and stable power transmission, avoid speed fluctuations, provide continuous power for the excessively long paper path between printing-cutting large sheets / rewinding, solve the problem of tension attenuation caused by insufficient power in the existing paper path, and further ensure the tension stability of the paper path; A swing roller arm 17 is rotatably connected to the inner wall of the support frame 1. One side of the swing roller arm 17 is fixedly connected to a swing roller counterweight rod 18, and the other side is rotatably connected to a swing roller 16. The inner wall of the swing roller arm 17 has parallel low-tension holes 19 and high-tension holes 20, with the low-tension holes 19 located near the centerline of the swing roller arm 17. The swing roller arm 17 is rotatably connected to an ultra-low friction swing rod cylinder 7 via either the low-tension hole 19 or the high-tension hole 20. A cylinder displacement sensor 6 is fixedly connected to the side of the ultra-low friction swing rod cylinder 7 and is rotatably connected to the support frame 1. There are two ultra-low friction swing rod cylinders 7, symmetrically distributed, whose pneumatic circuit synchronously controls the swing roller arm 17, ensuring synchronous drive by making the swing roller arm 17 a rigid synchronous beam. The swing roller counterweight rod 18 and the ultra-low friction swing rod cylinder 7 are mutually coordinated. The system allows for flexible adjustment of the swing arm tension based on the characteristics of thick and thin paper. Thick paper can meet high tension requirements by increasing counterweight, while thin paper can avoid excessive stretching by reducing counterweight, achieving personalized tension adaptation. The low-tension hole 19 and high-tension hole 20 form a clear tension zone, and the production conversion between thick and thin paper can be completed simply by switching the cylinder connection hole position, significantly shortening the changeover time. Two symmetrical ultra-low friction swing arm cylinders 7 are synchronously controlled through a pneumatic circuit. The ultra-low friction design improves the adjustment response speed. Together with the cylinder displacement sensor 6, it detects the position of the swing roller 16 in real time, forming a closed-loop adjustment mechanism that effectively eliminates paper expansion and contraction errors. At the same time, the swing roller lever arm 17 acts as a rigid synchronous beam to ensure synchronous swing on both sides, ensuring uniform lateral tension in the paper path, successfully solving the production pain points of unstable winding tension and uneven paper sizes during cutting. A paper pressing mechanism 10 is configured on the inner wall of the support frame 1. The paper pressing mechanism 10 consists of a paper pressing roller 13, a paper pressing arm 14, and a paper pressing cylinder 15. The paper pressing arm 14 is rotatably connected to the support frame 1, with the paper pressing roller 13 rotatably connected above it and the paper pressing cylinder 15 rotatably connected below it. The paper pressing cylinder 15 is also rotatably connected to the support frame 1. The paper pressing arm 14 is rotatably connected to both the support frame 1 and the paper pressing cylinder 15. The paper pressing cylinder 15 drives the paper pressing arm 14 to drive the paper pressing roller 13 to achieve flexible paper pressing. The pressing force can be flexibly adjusted according to the thickness of the paper—increasing the pressure for thicker paper to ensure traction stability and decreasing the pressure for thinner paper to avoid paper damage. This ensures both traction stability and protects the surface quality of the paper. At the same time, the paper pressing roller 13 can adapt to slight changes in the paper's position, always maintaining a stable pressing force, effectively preventing paper slippage, ensuring efficient power transmission of the traction main roller 12, and ensuring continuous and stable paper tension, providing reliable support for subsequent large sheet cutting / rewinding accuracy.

[0018] Working principle: When using a thick and thin paper force stabilization traction device, the paper first enters the equipment through the feed roller 2 on the right side of the support frame 1. Both the feed roller 2 and the threaded paper spreading roller 3 on the inner wall are threaded structures. When rotating, they generate a lateral flattening force on the paper, effectively eliminating paper wrinkles and edge curling, avoiding conveying deviation, and providing a flat paper path for subsequent tension control. At the same time, the tension roller 4, which is arranged parallel above the feed roller 2, is fully in contact with the paper. The tension sensor 21 on its side captures the initial tension data of the paper in real time and feeds the signal back to the control system, providing a basis for subsequent precise tension adjustment. Personalized tension control is achieved through the swing mechanism 5, depending on the paper type. When producing thick paper, the swing roller lever arm 17 is connected to the ultra-low friction swing rod cylinder 7 through the high tension position hole 20. At the same time, the counterweight of the swing roller counterweight rod 18 is added. The counterweight gravity and the cylinder thrust work together to provide high tension, which matches the low elongation requirement of thick paper and avoids traction instability caused by insufficient tension. When producing thin paper, the low-tension position hole 19 is switched to be close to the center line of the swing roller lever arm 17 to reduce the counterweight. The ultra-low friction swing arm cylinder 7 applies constant pressure so that the swing roller 16 forms a moderate tension force on the paper. If the thin paper stretches slightly, the cylinder displacement sensor 6 will detect the positional deviation of the swing roller 16 in real time. The control system will then adjust the speed of the traction main roller 12 to quickly compensate for the stretching error, forming a closed-loop control of "detection-feedback-adjustment" to avoid excessive stretching of the thin paper.

[0019] In addition, the two symmetrically distributed ultra-low friction swing arm cylinders 7 are synchronously controlled by the pneumatic circuit, and the swing roller lever arm 17 serves as a rigid synchronous beam to ensure that the swing rollers 16 on both sides swing synchronously, thus ensuring uniform transverse tension of the paper path. The traction main roller 12 is fixedly connected to the power source through the coupling 8, transmitting efficient and stable rotational speed, providing continuous traction power for excessively long paper paths, and solving the problem of tension attenuation caused by insufficient power in existing paper paths; the two right-angled trapezoidal swing arm anti-collision pads 11 at the top of the support frame 1 limit the maximum swing amplitude of the swing roller lever arm 17 through the L-shaped bracket, avoiding hard collision between the swing arm and the support frame 1 due to sudden tension changes or equipment start-up and shutdown, thus protecting the core components; After tension adjustment, the paper enters the pressing mechanism 10 area. The pressing cylinder 15 drives the pressing arm 14, which in turn drives the pressing roller 13 to flexibly press the paper. For thick paper, the pressing force is increased to ensure effective transmission of traction power and avoid slippage; for thin paper, the pressure is reduced to prevent damage to the paper surface. At the same time, the pressing arm 14 is rotatably connected to the support frame 1 and the pressing cylinder 15, so that the pressing roller 13 can adapt to slight changes in the paper position and always maintain a stable pressing force to ensure continuous and stable paper tension. Finally, the paper is output through the output roller 9, providing qualified paper material with uniform tension for subsequent large sheet cutting / rewinding processes, completely solving the problems of unstable winding tension and uneven paper sizes during cutting.

[0020] This completes a series of tasks. The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0021] 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 force-stabilizing traction device for thick and thin paper, characterized in that, The system includes a support frame (1), a feed roller (2), a threaded paper feeding roller (3), a tension roller (4), a tension sensor (21), a swing mechanism (5), a traction main roller (12), a coupling (8), and a paper pressing mechanism (10). The support frame (1) is installed on the side of the coupling (8), and the coupling (8) is fixedly connected to the shaft end of the traction main roller (12). The feed roller (2) is rotatably connected to the right side of the support frame (1), and the threaded paper feeding roller (3) is rotatably connected to the inner wall of the support frame (1). Both the feed roller (2) and the threaded paper feeding roller (3) have threaded structures on their surfaces. The tension roller (4) is arranged parallel above the feed roller (2), and the tension sensor (21) is installed at its connection end with the support frame (1). The swing mechanism (5) is located on the support frame (1). 1) The structure includes a cylinder displacement sensor (6), an ultra-low friction swing arm cylinder (7), a swing roller (16), a swing roller lever arm (17), and a swing roller counterweight rod (18). The swing roller lever arm (17) has a low tension hole (19) and a high tension hole (20). The swing roller lever arm (17) is rotatably connected to the ultra-low friction swing arm cylinder (7) through the low tension hole (19) or the high tension hole (20). The swing roller (16) and the swing roller counterweight rod (18) are respectively installed on both sides of the swing roller lever arm (17). The cylinder displacement sensor (6) is fixed on the side of the ultra-low friction swing arm cylinder (7). The ultra-low friction swing arm cylinder (7) is rotatably connected to the support frame (1). The paper pressing mechanism (10) is arranged on the inner wall of the support frame (1) and is used to flexibly press the paper.

2. The thick and thin paper force stabilizing traction device according to claim 1, characterized in that, The paper feed roller (2) has the same structure as the threaded paper spreading roller (3). The threaded structure of both is used to form a lateral flattening force on the paper during the paper conveying process, eliminating paper wrinkles and edge curling.

3. The thick and thin paper force stabilizing traction device according to claim 1, characterized in that, The tension sensor (21) works in conjunction with the tension roller (4) to detect the initial tension of different papers in real time. The tension sensor (21) can transmit the detected tension signal to the external control system.

4. The thick and thin paper force stabilizing traction device according to claim 1, characterized in that, There are two ultra-low friction swing arm cylinders (7) and they are symmetrically distributed on both sides of the swing roller lever arm (17). The two ultra-low friction swing arm cylinders (7) are synchronously controlled by a pneumatic circuit. The swing roller lever arm (17) serves as a rigid synchronous beam to ensure synchronous driving on both sides.

5. The thick and thin paper force stabilizing traction device according to claim 1, characterized in that, The paper pressing mechanism (10) includes a paper pressing roller (13), a paper pressing arm (14), and a paper pressing cylinder (15). One end of the paper pressing arm (14) is rotatably connected to the support frame (1), and the other end of the paper pressing arm (14) is rotatably connected to the paper pressing cylinder (15). The paper pressing roller (13) is rotatably connected above the paper pressing arm (14), and the end of the paper pressing cylinder (15) away from the paper pressing arm (14) is rotatably connected to the support frame (1).

6. The thick and thin paper force stabilizing traction device according to claim 1, characterized in that, The top of the support frame (1) is fixed with two swing arm anti-collision pads (11) by L-shaped bracket bolts. The swing arm anti-collision pads (11) are right-angled trapezoidal structures used to limit the maximum swing amplitude of the swing roller arm (17) and avoid hard collision with the support frame (1).

7. The thick and thin paper force stabilizing traction device according to claim 1, characterized in that, The low-tension hole (19) and the high-tension hole (20) are distributed parallel to each other on the inner wall of the swing roller arm (17), and the low-tension hole (19) is close to the center line of the swing roller arm (17). By switching the connection between the ultra-low friction swing rod cylinder (7) and the low-tension hole (19) or the high-tension hole (20), the different tension requirements of thick paper and thin paper can be adapted.

8. The thick and thin paper force stabilizing traction device according to claim 1, characterized in that, The counterweight rod (18) of the swing roller cooperates with the ultra-low friction swing rod cylinder (7). By adjusting the counterweight mass of the counterweight rod (18), the tension of the swing roller (16) on the paper is assisted, so as to avoid insufficient force on thick paper or excessive stretching of thin paper.

9. The thick and thin paper force stabilizing traction device according to claim 1, characterized in that, The cylinder displacement sensor (6) works in conjunction with the swing roller (16) to detect the position offset of the swing roller (16) in real time. The cylinder displacement sensor (6) can transmit the position signal to the external control system to form a closed-loop tension adjustment.

10. The thick and thin paper force stabilizing traction device according to claim 1, characterized in that, The device has dual-mode adaptation capability for thick and thin paper. By switching the connection hole positions of the swing roller lever arm (17) and the ultra-low friction swing rod cylinder (7), namely the high tension hole (20) for thick paper and the low tension hole (19) for thin paper, and cooperating with the adjustment of the counterweight mass of the swing roller counterweight rod (18), it is used to match the different tension requirements of thick and thin paper. The tension sensor (21), the cylinder displacement sensor (6) and the external control system constitute a closed-loop tension adjustment system. The tension sensor (21) collects the initial tension signal of the paper in real time, and the cylinder displacement sensor (6) collects the position offset signal of the swing roller (16) in real time. The control system synchronously adjusts the thrust of the ultra-low friction swing rod cylinder (7) and the rotation speed of the traction main roller (12) according to the above signals to ensure that the paper tension is stable within the preset range. The paper pressing mechanism (10) can adaptively adjust the pressing force according to the paper thickness to achieve flexible pressing of the paper.

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