A yarn tension buffer spring structure

Abstract

The utility model discloses a yarn tension buffer spring structure, including installing the mount on the equipment, be provided with the conveying spare for yarn transmission on the mount, still include the lever through the axle rod rotation connection on the mount, the end of lever is fixedly installed for yarn tension's tensioning roller, be provided with the blocking piece for limiting lever rotation stroke on the mount, be linked with lever through the first buffer spare on the mount, and form first working condition, be provided with the second buffer spare on the mount, when lever and second buffer spare contact, form second working condition, be linked with second buffer spare through the adjusting part on the mount, the utility model solves the contradiction that traditional single spring buffer is short of sensitivity to deal with small amplitude fluctuation, and the impact intensity of bearing is not enough, significantly reduce yarn broken end, the risk of fluff and tensile deformation, adapt the tension control demand under different transmission working condition.

Description

Technical Field

[0001] This utility model relates to the field of textile machinery technology, and more specifically, to a yarn tension buffer spring structure. Background Technology

[0002] In the yarn processing and production process of industries such as textiles and chemical fibers, yarn needs to undergo multiple transmission processes to complete operations such as weaving and winding. The stability of yarn tension directly determines the quality of the final product and production efficiency. During the transmission process, yarn tension is easily affected by factors such as equipment start-up and shutdown, speed changes, and differences in yarn material, which can easily cause instantaneous fluctuations. If the tension is too high, it will cause the yarn to stretch and deform, and break; if the tension is too low, it will cause the yarn to slack and become tangled. This not only increases production losses but also seriously affects the density uniformity and surface smoothness of the fabric. Therefore, real-time buffering and control of yarn tension has become a key technical requirement in the industry.

[0003] Currently, most yarn tension buffer devices on the market employ a design approach combining a single elastic element with a limiting structure. This involves absorbing tension fluctuation energy through the deformation of the elastic element, and then using the limiting component to restrict the buffering stroke, thus achieving a basic tension stabilization effect. These devices are simple in structure and low in cost, and are widely used in low-precision yarn processing scenarios. Their core principle is to utilize the stretching and contracting characteristics of the elastic element to offset changes in yarn tension, preventing sudden tension changes from causing direct damage to the yarn.

[0004] However, existing buffering devices still have certain problems in practical applications: On the one hand, the buffering parameters of a single elastic element are fixed and cannot adapt to tension fluctuations of different amplitudes during yarn transmission. When facing small tension fluctuations, excessive buffering force can easily lead to yarn slack. When facing large tension impacts caused by equipment speed changes, yarn splices, etc., insufficient buffering strength makes it difficult to quickly dissipate the impact force, and there is still a risk of yarn breakage. On the other hand, the buffering threshold adjustment of existing devices is not flexible enough and it is difficult to accurately adjust according to the tension tolerance of different yarn materials such as cotton, chemical fiber, and blended yarns, as well as the tension requirements at different transmission speeds. Moreover, the coordination between the limiting structure and the buffering structure is not reasonable enough, which can easily lead to limited buffering stroke or excessive oscillation, resulting in low tension control accuracy and failing to meet the needs of high-precision yarn processing. Therefore, we urgently need a yarn tension buffering spring structure to solve the above problems. Utility Model Content

[0005] One objective of this invention is to provide a new technical solution for a yarn tension buffer spring structure. By setting a two-stage tension spring for graded buffering and lever linkage triggering structure, adaptive buffering of yarn tension fluctuations of different amplitudes can be achieved. Combined with an adjustable limit and quick positioning adjustment structure, the tension control accuracy and adaptability to working conditions are improved, yarn breakage and deformation are reduced, and the overall structure is simple and easy to adjust.

[0006] According to a first aspect of this utility model, a yarn tension buffer spring structure is provided, including a mounting frame installed on a device, wherein a conveying component for yarn transmission is provided on the mounting frame, characterized in that: it further includes a lever rotatably connected to the mounting frame via a shaft, wherein a tensioning roller for yarn tensioning is fixedly installed at the end of the lever, and a blocking component for limiting the rotational stroke of the lever is provided on the mounting frame, wherein the mounting frame is connected to the lever via a first buffer component to form a first working state, wherein a second buffer component is provided on the mounting frame, and a second working state is formed when the lever contacts the second buffer component, wherein the mounting frame is connected to the second buffer component via an adjusting component.

[0007] Optionally, the blocking element includes a first stop rod threaded onto the mounting bracket, the first stop rod being located above the lever, forming an upper travel limit zone for the lever when the lever abuts against the first stop rod; the mounting bracket is threaded onto a second stop rod, the second stop rod being located below the lever and offset from the first stop rod, forming a lower travel limit zone for the lever when the lever abuts against the second stop rod.

[0008] Optionally, the first buffer includes a first bracket fixedly mounted on the mounting frame, and a first tension spring is provided between the first bracket and the lever. The two ends of the first tension spring are respectively connected to the first bracket and the lever. When the yarn passes through the tension roller and drives the lever to swing around the shaft axis, the first tension spring swings with the lever and forms a first elastic tensile deformation zone.

[0009] Optionally, the second buffer includes a second bracket mounted on a mounting frame. The mounting frame has an arc-shaped groove, and a movable block is slidably connected in the arc-shaped groove. A plug-in rod is fixedly mounted on the movable block. A second tension spring is provided between the second bracket and the plug-in rod, and the two ends of the second tension spring are respectively connected to the second bracket and the plug-in rod.

[0010] Optionally, a U-shaped frame is fixedly installed on the movable block, and a hook matching the U-shaped frame is fixedly installed at the end of the lever. The hook is located inside the U-shaped frame and contacts its inner walls on both sides to form a sliding area. When the yarn passes through the tension roller and drives the lever and hook to swing around the shaft axis, the hook abuts against the inner top wall of the U-shaped frame and drives the movable block to move along the arc-shaped groove. The second tension spring moves with the movable block and forms a second elastic tensile deformation area.

[0011] Optionally, the preload of the second tension spring is greater than that of the first tension spring, so that it is in the first working state when the lever swings slightly and in the second working state when the lever swings significantly.

[0012] Optionally, the adjusting component includes a sliding plate fixedly mounted on a mounting bracket. A slider is slidably connected to the sliding cavity of the sliding plate via symmetrically arranged guide rods. A screw is disposed in the sliding cavity of the sliding plate and between the two sets of guide rods. The slider is threadedly connected to the screw. One end of the screw is rotatably connected to the inner wall of the sliding plate, and the other end of the screw passes through the sliding plate and is fixedly mounted with a rotating wheel. When the rotating wheel is turned, the screw rotates and drives the slider to move along the path of the guide rods.

[0013] Optionally, a fixing plate is fixedly connected to the slider, and an insertion groove is provided on the fixing plate. A magnetic block is fixedly installed on the bottom wall of the insertion groove. Placement holes are provided in the insertion groove at equal intervals in an annular shape. A sleeve is fixedly installed in the placement hole. A sliding rod is slidably connected in the sleeve. A spring is provided in the sleeve. The two ends of the spring are respectively connected to the inner wall of the sleeve and the sliding rod. A clamping head is fixedly connected to the end of the sliding rod.

[0014] Optionally, a positioning rod adapted to the insertion slot is fixedly connected to the second bracket. The positioning rod has annularly equidistant clamping grooves that match the clamping head. The positioning rod also has annularly equidistant snap-fit ​​grooves that match the clamping grooves. The snap-fit ​​grooves are connected to the corresponding clamping grooves. A pad for anti-slip is fixedly installed in the snap-fit ​​groove. A magnetic sheet adapted to the magnetic block is fixedly connected to the positioning rod. When the positioning rod is inserted into the insertion slot, the clamping head is in the clamping groove to form a preliminary positioning area. When the magnetic sheet and the magnetic block are magnetically attracted, the second bracket is rotated to make the clamping head slide into the snap-fit ​​groove, and the pad abuts against the clamping head to form a stable positioning area.

[0015] Beneficial effects

[0016] 1. This utility model employs a graded buffer structure composed of a first tension spring and a second tension spring. Combined with the design that the pre-tension force of the second tension spring is greater than that of the first tension spring, and a triggering mechanism that utilizes the gap between the hook and the U-shaped frame, it achieves precise adaptation to yarn tension fluctuations. During small tension fluctuations, only the first tension spring intervenes independently, filtering out high-frequency, low-amplitude jitter with its sensitive elastic deformation, ensuring the basic tension stability of the yarn. During large tension impacts, the hook crosses the gap to push the moving block, causing the second tension spring to work synchronously. The two levels of elastic deformation work together to dissipate the impact force, resolving the contradiction of insufficient sensitivity to small fluctuations and insufficient strength to withstand large impacts in traditional single-spring buffers. This significantly reduces the risk of yarn breakage, fuzzing, and tensile deformation, adapting to tension control needs under different transmission conditions.

[0017] 2. This utility model combines a screw-driven adjusting component with a positioning structure that uses both magnetic attraction and snap-fit ​​locking to achieve convenient and precise adjustment of the second buffer component. The rotating wheel drives the screw-driven slider to move linearly, allowing stepless adjustment of the second bracket position to change the preload of the second tension spring. Combined with the self-locking engagement of the evenly distributed annular clamping heads and the L-shaped snap-fit ​​groove, it ensures the stability and reliability of the second tension spring's force fulcrum and allows for buffer threshold adjustment without disassembling parts. At the same time, the threaded adjustable misalignment blocking component can independently set the lever's vertical swing limit. Compared with existing buffer devices that are cumbersome to adjust and have loose positioning, this significantly improves the adaptability to different materials and yarn counts, as well as the convenience of equipment maintenance and yarn replacement operations, and offers superior long-term operational stability.

[0018] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present invention and, together with their description, serve to explain the principles of the present invention.

[0020] Figure 1 A first-view schematic diagram of the overall structure of a yarn tension buffer spring;

[0021] Figure 2 A second-view schematic diagram of the overall structure of a yarn tension buffer spring;

[0022] Figure 3 A schematic diagram of a partial cross-sectional structure of a yarn tension buffer spring;

[0023] Figure 4 A schematic diagram of the second support structure of a yarn tension buffer spring structure;

[0024] Figure 5 A partial cross-sectional schematic diagram of a yarn tension buffer spring structure;

[0025] Figure 6 A yarn tension buffer spring structure Figure 5 Enlarged structural diagram at point A in the middle;

[0026] Figure 7 A yarn tension buffer spring structure Figure 5 Enlarged structural diagram at point B;

[0027] Figure 8 A yarn tension buffer spring structure Figure 7 Enlarged structural diagram at point C.

[0028] The diagram shows the following components: 1. Mounting frame; 2. Conveying component; 3. Lever; 4. Tensioning roller; 5. First stop bar; 6. Second stop bar; 7. First bracket; 8. First tension spring; 9. Second bracket; 10. Arc-shaped slide groove; 11. Moving block; 12. Insertion rod; 13. Second tension spring; 14. U-shaped frame; 15. Hook; 16. Sliding plate; 17. Guide rod; 18. Slider; 19. Screw; 20. Rotating wheel; 21. Fixing plate; 22. Insertion groove; 23. Magnetic block; 24. Placement hole; 25. Sleeve; 26. Slide rod; 27. Spring; 28. Clamping head; 29. ​​Positioning rod; 30. Clamping groove; 31. Snap-fit ​​groove; 32. Gasket; 33. Magnetic sheet. Detailed Implementation

[0029] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0030] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0031] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0032] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0033] like Figure 1-8 As shown, a yarn tension buffer spring structure includes a mounting frame 1 installed on a device, a conveyor 2 for yarn transmission on the mounting frame 1, and a lever 3 rotatably connected to the mounting frame 1 via a shaft. A tensioning roller 4 for yarn tensioning is fixedly installed at the end of the lever 3.

[0034] Here, the mounting frame 1 is a rigid plate structure that can be fixedly connected to the external equipment frame by bolts or welding. The conveying component 2 can be a freely rotatable yarn guide wheel or a smooth-surfaced yarn guide rod. After the yarn passes through the conveying component 2, it contacts the surface of the tension roller 4, forming a wrapping support for the yarn. The two ends of the shaft can be installed in the shaft holes on the mounting frame 1 by bearings or bushings. The middle part of the lever 3 is fixedly connected to the shaft, so that the lever 3 can swing back and forth around the shaft axis in the plane where the mounting frame 1 is located. The change in yarn tension can be converted into the deflection motion of the lever 3 around the shaft, providing a sensitive mechanical triggering basis for the subsequent elastic buffer response.

[0035] Furthermore, lever 3 is a long, rigid arm, which can be made of steel or aluminum alloy. The end of lever 3 away from the shaft can be fixed to the support shaft of tension roller 4 by fasteners or welding. The outer circumferential surface of tension roller 4 can be provided with an annular yarn guide groove or be smooth to reduce the risk of yarn slippage during transmission. The mounting frame 1 can be provided with yarn passage holes or yarn guide ceramic eyes that cooperate with the conveyor 2. After the yarn passes through the yarn guide ceramic eye, it enters the conveyor 2, then contacts the tension roller 4, and is finally output, which helps to ensure the stability of the yarn path.

[0036] Furthermore, the above-mentioned structure changes the existing technology that relies solely on tension springs to directly tighten the yarn. By using lever 3 and swingable tension roller 4, the yarn tension fluctuation is converted into the angular displacement of lever 3, so that the tension change can be transmitted. The structure is simple, has a small moment of inertia, and is relatively sensitive to response. It also provides a reliable transmission link for subsequent graded buffering and stroke limitation, which helps to reduce the damage to components or yarn breakage caused by excessive instantaneous yarn tension.

[0037] The mounting bracket 1 is provided with a barrier to limit the rotational stroke of the lever 3. The barrier includes a first stop 5 threaded on the mounting bracket 1, which is located above the lever 3. When the lever 3 abuts against the first stop 5, an upper stroke limit area is formed for the lever 3. The mounting bracket 1 is threaded with a second stop 6, which is located below the lever 3 and is offset from the first stop 5. When the lever 3 abuts against the second stop 6, a lower stroke limit area is formed for the lever 3.

[0038] Here, both the first stop 5 and the second stop 6 are externally threaded rods. The end of the rod facing the lever 3 can be fixed with a buffer pad or have a rounded end face. The mounting bracket 1 is provided with a mounting hole with internal threads. By rotating the stop rod, the length of its end extending toward the lever 3 can be adjusted, thereby independently setting the limit positions of the lever 3's upward and downward swing. The misalignment setting means that the first stop 5 and the second stop 6 are offset from each other along the length direction of the lever 3 or in the direction perpendicular to the swing plane, which can ensure that the two will not contact the lever 3 at the same time, and the corresponding abutment parts of the lever 3 are different contact surfaces, ensuring that the upper and lower limits do not interfere with each other.

[0039] Furthermore, the first stop 5 limits the upward swing of the lever 3 to prevent the tension roller 4 from rising excessively and losing support for the yarn when the yarn is slack. The second stop 6 limits the downward swing of the lever 3 to prevent the tension roller 4 from pressing down excessively when the tension is too high, which would cause the yarn to have an excessive wrap angle with the conveyor 2 and generate excessive frictional resistance. Together, they define the safe working range of the lever 3.

[0040] Furthermore, this threaded adjustable upper and lower staggered blocking component allows operators to independently adjust the upper and lower limit positions according to the actual tension requirements of different yarn types, preventing lever 3 from entering the unrestricted non-working area during the buffering process. This helps ensure the stability of the yarn transmission path and the safety of equipment operation. Its staggered layout also prevents the two levers from blocking each other during adjustment, improving the convenience of maintenance and adjustment.

[0041] The mounting frame 1 is connected to the lever 3 via a first buffer component, forming a first working state. The first buffer component includes a first bracket 7 fixedly mounted on the mounting frame 1. A first tension spring 8 is provided between the first bracket 7 and the lever 3. The two ends of the first tension spring 8 are respectively connected to the first bracket 7 and the lever 3. When the yarn passes through the tension roller 4 and drives the lever 3 to swing around the shaft axis, the first tension spring 8 swings with the lever 3 and forms a first elastic tensile deformation zone.

[0042] Here, the first bracket 7 can be fastened to the side of the mounting bracket 1 by welding or screws. It can be provided with hanging holes or hanging pins. The corresponding position of the lever 3 can also be provided with connecting holes. The hooks at both ends of the first tension spring 8 can be hooked into the hanging holes and the connecting holes of the lever 3 respectively, so that the axis of the first tension spring 8 is arranged approximately along the line connecting the lever 3 and the first bracket 7 when the lever 3 swings. When the lever 3 is in a free state or is only subjected to normal yarn tension, the first tension spring 8 can have a certain initial tension to provide basic preload.

[0043] Furthermore, with the slight pulsation of yarn tension, lever 3 swings back and forth and pulls the first tension spring 8 to produce corresponding tensile deformation. The elastic restoring force of the first tension spring 8 acts in the opposite direction on lever 3, attempting to pull lever 3 back to the equilibrium position, thereby absorbing and releasing the energy of small tension fluctuations in the yarn. At this time, the device is in the first working state where only the first tension spring 8 intervenes.

[0044] Furthermore, the structure of directly connecting the first tension spring 8 and the lever 3 provides a more sensitive dynamic response and a simple structure. This helps to filter out high-frequency, low-amplitude tension fluctuations generated during constant or slightly variable speed operation of the yarn, maintaining a relatively constant tension of the yarn. This helps to reduce yarn hairiness and breakage rate caused by tension fluctuations, and improves the situation where existing tensioners are insufficient in suppressing small fluctuations.

[0045] The mounting frame 1 is provided with a second buffer. When the lever 3 contacts the second buffer, a second working state is formed. The second buffer includes a second bracket 9 provided on the mounting frame 1. The mounting frame 1 is provided with an arc-shaped slide groove 10. A moving block 11 is slidably connected in the arc-shaped slide groove 10. A plug rod 12 is fixedly installed on the moving block 11. A second tension spring 13 is provided between the second bracket 9 and the plug rod 12. The two ends of the second tension spring 13 are respectively connected to the second bracket 9 and the plug rod 12.

[0046] Here, the arc-shaped groove 10 can be a long arc-shaped hole that penetrates the plate of the mounting bracket 1. Its arc center line can be coaxial or flush with the rotation axis of the lever 3 around the axis to ensure that the trajectory of the moving block 11 sliding along the arc-shaped groove 10 matches the movement trajectory of the hook 15 at the end of the lever 3. A slide rail part matching the cross section of the arc-shaped groove 10 can be formed on the rear side of the moving block 11, and rolling elements can be added to reduce sliding friction. The second bracket 9 is detachably installed on the mounting bracket 1 as a fixed fulcrum of the second tension spring 13. The plug rod 12 is fixed perpendicular to the surface of the moving block 11 and is used to connect one end of the second tension spring 13.

[0047] Furthermore, one end of the second tension spring 13 can be hooked onto the hooking structure of the second bracket 9, and the other end can be hooked onto the plug rod 12, forming an elastic pull on the moving block 11. In its natural state, the moving block 11 can stay at one end of the arc-shaped slide groove 10 under the pre-tightening force of the second tension spring 13. When the lever 3 swings significantly to push the moving block 11 to move along the arc-shaped slide groove 10, the second tension spring 13 is further stretched, producing a secondary elastic deformation.

[0048] Furthermore, by setting the arc-shaped slide 10 to rotate coaxially with the lever 3, it can be ensured that when the second-stage buffer intervenes, the moving block 11 always moves along the arc trajectory synchronized with the lever 3, reducing jamming caused by motion interference or loss of force, and making the deformation direction of the second tension spring 13 consistent with its force axis, which enhances the stability of force transmission and the smoothness of buffering action, and provides a reliable guiding foundation for withstanding large impacts.

[0049] A U-shaped frame 14 is fixedly installed on the movable block 11. A hook 15 matching the U-shaped frame 14 is fixedly installed at the end of the lever 3. The hook 15 is inside the U-shaped frame 14 and contacts its inner walls on both sides to form a sliding area. When the yarn passes through the tension roller 4 and drives the lever 3 and hook 15 to swing around the shaft axis, the hook 15 abuts against the inner top wall of the U-shaped frame 14 and drives the movable block 11 to move along the arc-shaped slide groove 10. The second tension spring 13 moves with the movable block 11 and forms a second elastic tensile deformation area.

[0050] Here, the U-shaped frame 14 has parallel side walls and an inner top wall connecting the side walls, which together form an accommodating space with the opening facing the lever 3. The hook 15 can be a thick rod or plate structure, extending from the end of the lever 3 toward the U-shaped frame 14 and inserted into the accommodating space. The outer surfaces of the two sides of the hook 15 can slide against the inner walls of the two sides of the U-shaped frame 14 respectively, forming a sliding area that limits the hook 15 to sliding only along the longitudinal direction of the U-shaped frame 14, reducing the possibility of the hook 15 detaching laterally. At the same time, a preset movable gap can be maintained between the hook 15 and the inner top wall of the U-shaped frame 14 under static conditions.

[0051] Furthermore, when the yarn experiences a small change in tension and the displacement of the hook 15 corresponding to the swing of the lever 3 does not exceed the aforementioned movement gap, the hook 15 only moves within the U-shaped frame 14 without pushing against it. At this time, only the first tension spring 8 participates in buffering. Once the lever 3 deflects significantly due to start-stop, sudden speed change, etc., the hook 15 contacts the inner top wall of the U-shaped frame 14 after crossing the gap, thereby pushing the moving block 11 to overcome the preload of the second tension spring 13 and slide along the arc-shaped groove 10.

[0052] Furthermore, this transmission structure with a clearance fit between the hook 15 and the U-shaped frame 14 enables automatic switching thresholds between the two-stage buffers. The mechanical triggering eliminates the need for sensors or control units, resulting in high reliability. Meanwhile, the continuous limiting of the hook 15 by the inner walls on both sides reduces the risk of the hook 15 disengaging from the U-shaped frame 14 during high-speed swing, ensuring stable power connection under large strokes. This allows for timely and clear intervention of the secondary elastic tensile deformation zone, which helps improve the system's ability to withstand large tensile impacts.

[0053] The preload of the second tension spring 13 is greater than that of the first tension spring 8, so that when the lever 3 swings slightly, it is in the first working state, and when the lever 3 swings significantly, the second tension spring 13 intervenes simultaneously and is in the second working state.

[0054] Here, both the first tension spring 8 and the second tension spring 13 can have an initial tension after assembly, generating a first preload and a second preload respectively. Setting the preload of the second tension spring 13 to be greater than that of the first tension spring 8 means that a larger external driving force is required to further stretch the second tension spring 13. This difference in preload can be achieved by selecting tension springs with different wire diameters, pitch diameters, or free lengths, combined with the initial installation tension of the second tension spring 13.

[0055] Furthermore, when the lever 3 swings slightly, the thrust acting between the hook 15 and the U-shaped frame 14 may not be enough to overcome the pre-tension of the second tension spring 13. The moving block 11 remains stationary, and only the first tension spring 8 is stretched. Only when the torque generated by the yarn tension impact is amplified by the lever 3 and exceeds the switching threshold determined by the pre-tension of the second tension spring 13, can the hook 15 push the U-shaped frame 14 and drive the moving block 11, causing the second tension spring 13 to deform synchronously. At this time, the second tension spring 13 and the first tension spring 8 work together to buffer the movement.

[0056] Furthermore, by setting the second tension spring 13 to have a larger preload, the system achieves graded elastic characteristics of stiffness. Under low load, only the relatively soft first tension spring 8 works, ensuring high sensitivity to small fluctuations. Under high load, the relatively stiff second tension spring 13 intervenes, providing progressive buffering and damping, reducing the situation where impact energy is completely absorbed by a single-stage tension spring, resulting in deformation exceeding the limit or the tension roller 4 rebounding too quickly. This achieves better adaptation to tension fluctuations under different working conditions.

[0057] The mounting bracket 1 is connected to the second buffer via an adjusting component. The adjusting component includes a sliding plate 16 fixedly mounted on the mounting bracket 1. A slider 18 is slidably connected to the sliding cavity of the sliding plate 16 via symmetrically arranged guide rods 17. A screw 19 is provided in the sliding cavity of the sliding plate 16 and between the two sets of guide rods 17. The slider 18 is threadedly connected to the screw 19. One end of the screw 19 is rotatably connected to the inner wall of the sliding plate 16, and the other end of the screw 19 passes through the sliding plate 16 and is fixedly mounted with a rotating wheel 20. When the rotating wheel 20 is turned, the screw 19 rotates and drives the slider 18 to move along the path of the guide rods 17.

[0058] Here, the sliding plate 16 can be a rectangular cross-section elongated structure with an opening on one side or hollowed out inside. The inner wall of its sliding cavity can be designed as a smooth surface. The two sets of guide rods 17 can be optical shafts of equal diameter, with both ends fixed to the inner wall of the sliding plate 16 and symmetrically distributed on both sides of the screw 19 in the sliding cavity. The slider 18 can be provided with guide holes that slide with the guide rods 17 and a central threaded hole that mates with the screw 19. One end of the screw 19 can be rotatably supported on the inner wall of the sliding plate 16 by a bearing or a shoulder, with the drive end extending out. The rotating wheel 20 can be fixed to this end by a key connection or a pin. The outer circle of the rotating wheel 20 can be knurled to increase the friction of the hand-operated mechanism.

[0059] Furthermore, when it is necessary to adjust the intervention threshold of the second buffer, the operator can manually rotate the rotating wheel 20, and the screw 19 rotates synchronously. Since the guide rod 17 restricts the circumferential rotational freedom of the slider 18, the slider 18 can only make linear feed movements along the guide rod 17. The displacement of the slider 18 is transmitted to the second bracket 9 through the fixed plate 21, thereby changing the distance between the second bracket 9 and the moving block 11, which changes the tension length of the second tension spring 13 in the initial state, thereby realizing the stepless continuous adjustment of the pretension force of the second tension spring 13.

[0060] Furthermore, the adjustment component precisely converts rotational motion into linear displacement of slider 18. The preload of the second tension spring 13 can be quantitatively adjusted by observing the position of slider 18 or setting scale markings, without disassembling any parts. The adjustment process is convenient and quick. The symmetrical guide rod 17 layout helps to counteract the off-center load torque, ensuring smooth movement of slider 18 and reducing jamming. This makes the adjustment of buffer characteristics for different yarn materials, counts, or transmission speeds more accurate and controllable, improving the versatility of the device under various production conditions and its ability to quickly change yarns.

[0061] A fixing plate 21 is fixedly connected to the slider 18. The fixing plate 21 has an insertion groove 22. A magnetic block 23 is fixedly installed on the bottom wall of the insertion groove 22. Placement holes 24 are equidistantly arranged in a ring inside the insertion groove 22. A sleeve 25 is fixedly installed in the placement hole 24. A sliding rod 26 is slidably connected inside the sleeve 25. A spring 27 is provided inside the sleeve 25. The two ends of the spring 27 are respectively connected to the inner wall of the sleeve 25 and the sliding rod 26. A pressing head 28 is fixedly connected to the end of the sliding rod 26.

[0062] Here, the fixing plate 21 can be a metal block, which is fixed to the front end face of the slider 18 by bolts or integral molding. The insertion groove 22 can be a cylindrical countersunk hole or blind hole opened on the surface of the fixing plate 21, with its opening facing the second bracket 9. The magnetic block 23 can be a permanent magnet, which is embedded and fixed in the center of the bottom wall of the insertion groove 22. Three or more placement holes 24 are evenly distributed circumferentially in the side wall of the insertion groove 22. A sleeve 25 is pressed into each placement hole 24. The hollow hole of the sleeve 25 faces the central axis of the insertion groove 22. The slide rod 26 is fitted into the sleeve 25 with clearance. The spring 27 is pre-installed in a compressed state between the bottom of the sleeve 25 and the slide rod 26, and always applies a thrust pointing towards the center of the insertion groove 22 to the slide rod 26. The clamping head 28 can be a ball head, wedge head or conical head fixed to the end of the slide rod 26.

[0063] Furthermore, in the free state, the spring 27 pushes the slide bar 26 together with the clamping head 28 into the inner cavity of the insertion groove 22, forming an inwardly protruding elastic snap-fit ​​part. When the positioning rod 29 of the second bracket 9 is not inserted, each clamping head 28 is in the waiting-to-apply state. This elastic snap-fit ​​structure can automatically adapt to the shape error of the mating parts and provide a certain clamping and holding force.

[0064] Furthermore, this assembly of spring 27, slide bar 26, and clamping head 28, which is set in the built-in hole, has a compact structure and is completely concealed. It is not easily jammed by lint or dust. The multi-point annular distribution can apply a centering clamping force to the positioning rod 29 from multiple radial directions. Combined with the attraction of the magnetic block 23, it ensures the coaxiality and stable suspension of the second bracket 9 in the initial stage of installation, which facilitates subsequent quick locking operations and improves the problems of easy loosening and difficult alignment of traditional quick-installation structures.

[0065] A positioning rod 29 adapted to the insertion slot 22 is fixedly connected to the second bracket 9. The positioning rod 29 has a ring-shaped groove 30 that matches the clamping head 28. The positioning rod 29 also has a ring-shaped groove 31 that matches the clamping groove 30. The groove 31 is connected to the corresponding clamping groove 30. A pad 32 for anti-slip is fixedly installed in the groove 31. A magnetic piece 33 adapted to the magnetic block 23 is fixedly connected to the positioning rod 29. When the positioning rod 29 is inserted into the insertion slot 22, the clamping head 28 is in the clamping groove 30 to form a preliminary positioning area. When the magnetic piece 33 is magnetically attracted to the magnetic block 23, the second bracket 9 is rotated to make the clamping head 28 slide into the groove 31 and abut against the clamping head 28 through the pad 32 to form a stable positioning area.

[0066] Here, the positioning rod 29 is a cylinder, and its outer diameter is in clearance fit with the inner diameter of the insertion groove 22. A magnetic piece 33 is fixed at the center of the front end face of the positioning rod 29. The polarity of the magnetic piece 33 is set to attract the magnetic block 23. Multiple clamping grooves 30 are opened axially on the outer peripheral surface of the positioning rod 29. Their positions and numbers correspond one-to-one with the clamping heads 28. Each clamping groove 30 extends a snap-fit ​​groove 31 to one side in the circumferential direction, so that the clamping groove 30 and the snap-fit ​​groove 31 are connected in an L-shaped or hook-shaped path. The snap-fit ​​groove 31 is a groove with a bottom wall and a side wall. An anti-slip pad 32 is fixed on its inner surface. The pad 32 can be made of a material with a high coefficient of friction, such as rubber or polyurethane.

[0067] Furthermore, during assembly, the positioning rod 29 is aligned with the insertion slot 22 and pushed in. Under the action of the spring 27, the clamping head 28 first springs in and slides into the clamping groove 30, forming an axial anti-reverse. At this time, the second bracket 9 is not easy to fall out on its own, achieving initial positioning. As it is further inserted, the magnetic sheet 33 and the magnetic block 23 are attracted and adhered tightly, giving a clear sense of being in place. Then, the second bracket 9 is rotated, causing the clamping head 28 to slide from the clamping groove 30 into the fastening groove 31. The gasket 32 ​​in the fastening groove 31 is squeezed by the clamping head 28 and undergoes elastic deformation, forming an interference fit.

[0068] Furthermore, the locking structure achieves a double locking mechanism of axial pre-positioning followed by circumferential tightening. The frictional self-locking between the clamping head 28 and the engaging groove 31 with a washer 32 helps prevent the second bracket 9 from rotating and loosening under vibration conditions, ensuring that the position of the force fulcrum of the second tension spring 13 remains constant. The attraction of the magnetic block 23 also provides auxiliary axial pre-tightening, keeping the engagement groove 31 and the clamping head 28 tightly fitted in a vibration environment. During disassembly, simply rotating in the opposite direction is sufficient to remove the locking area and pull it out, improving the installation rigidity, operational repeatability, and long-term reliability of the second buffer component, and ensuring the stability of the secondary buffer parameters.

[0069] In this utility model, the second bracket 9 completes preliminary assembly by inserting the positioning rod 29 into the insertion slot 22 of the fixing plate 21. The clamping head 28 is engaged in the clamping groove 30 of the positioning rod 29 under the elastic action of the spring 27 inside the sleeve 25 to form preliminary positioning. After the magnetic piece 33 on the positioning rod 29 is magnetically attracted and attached to the magnetic block 23 on the bottom wall of the insertion slot 22, the second bracket 9 is rotated to make the clamping head 28 slide into the fastening groove 31. The pad 32 is used to clamp the clamping head 28 to achieve stable positioning, laying the structural foundation for the buffer operation. The yarn passes through the conveyor 2 on the mounting frame 1. During transmission, the tension roller 4 at the end of the lever 3 is in close contact with the yarn. The basic tension is achieved by the support of the tension roller 4. The rotation stroke of the lever 3 is limited by the first stop 5 and the second stop 6 on the mounting frame 1 to avoid excessive swinging that affects the yarn transmission. When the yarn experiences a small tension fluctuation, the tension change causes the lever 3 to rotate around the shaft. The lever 3 pulls the first tension spring 8 connected to the first bracket 7 to form the first elastic tensile deformation zone. The first tension spring 8 offsets the small tension fluctuation by its own elastic deformation, and the device is in the first working state.

[0070] When the yarn encounters a large tensile impact caused by equipment start-up, shutdown, speed change, etc., the rotation amplitude of lever 3 increases, and the hook 15 at its end slides inside the U-shaped frame 14 and abuts against the inner top wall of the U-shaped frame 14, thereby pushing the moving block 11 to slide directionally along the arc-shaped slide groove 10 on the mounting frame 1. The moving block 11 pulls the second tension spring 13 connected to the second bracket 9 through the plug rod 12 to form a second elastic tensile deformation zone. Because the preload of the second tension spring 13 is greater than that of the first tension spring 8, the second tension spring 13 synchronously intervenes to buffer, and the device switches to the second working state. In this state, the large-scale tension impact is dissipated through the synergistic effect of two-stage elastic tensile deformation. When it is necessary to adjust the buffer threshold according to the yarn material and transmission speed, the rotating wheel 20 drives the screw 19 to rotate on the inner wall of the sliding plate 16. The screw 19 drives the threaded slider 18 to move linearly along the symmetrically arranged guide rod 17. The slider 18 drives the fixed plate 21 and the insertion slot 22 to move synchronously, thereby adjusting the installation position of the second bracket 9 and realizing the precise control of the initial tension of the second tension spring 13, ensuring that the device is adapted to the yarn tension buffering needs under different working conditions.

[0071] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A yarn tension buffer spring structure comprising a mounting rack (1) mounted on a device, said mounting rack (1) being provided with a conveyor (2) for yarn transfer, characterized in that: It also includes a lever (3) rotatably connected to the mounting frame (1) via a shaft. A tensioning roller (4) for yarn tensioning is fixedly installed at the end of the lever (3). A barrier for limiting the rotation stroke of the lever (3) is provided on the mounting frame (1). The mounting frame (1) is connected to the lever (3) via a first buffer and forms a first working state. A second buffer is provided on the mounting frame (1). When the lever (3) contacts the second buffer, a second working state is formed. The mounting frame (1) is connected to the second buffer via an adjusting member.

2. The yarn tension buffer spring structure according to claim 1, characterized in that: The blocking component includes a first stop (5) threaded onto the mounting bracket (1), the first stop (5) being located above the lever (3), and forming an upper travel limit zone for the lever (3) when the lever (3) abuts against the first stop (5). The mounting bracket (1) is threaded onto a second stop (6), the second stop (6) being located below the lever (3), and the second stop (6) being offset from the first stop (5), forming a lower travel limit zone for the lever (3) when the lever (3) abuts against the second stop (6).

3. The yarn tension buffer spring structure according to claim 2, characterized in that: The first buffer includes a first bracket (7) fixedly installed on the mounting frame (1). A first tension spring (8) is provided between the first bracket (7) and the lever (3). The two ends of the first tension spring (8) are respectively connected to the first bracket (7) and the lever (3). When the yarn passes through the tension roller (4) and drives the lever (3) to swing around the shaft axis, the first tension spring (8) swings with the lever (3) and forms a first elastic tensile deformation zone.

4. The yarn tension buffer spring structure according to claim 3, characterized in that: The second buffer includes a second bracket (9) mounted on a mounting frame (1). An arc-shaped groove (10) is provided on the mounting frame (1). A movable block (11) is slidably connected in the arc-shaped groove (10). A plug rod (12) is fixedly mounted on the movable block (11). A second tension spring (13) is provided between the second bracket (9) and the plug rod (12). The two ends of the second tension spring (13) are respectively connected to the second bracket (9) and the plug rod (12).

5. The yarn tension buffer spring structure according to claim 4, characterized in that: A U-shaped frame (14) is fixedly installed on the movable block (11). A hook (15) matching the U-shaped frame (14) is fixedly installed at the end of the lever (3). The hook (15) is inside the U-shaped frame (14) and contacts its inner walls on both sides to form a sliding area. When the yarn passes through the tension roller (4) and drives the lever (3) and hook (15) to swing around the shaft axis, the hook (15) abuts against the top wall inside the U-shaped frame (14) and drives the movable block (11) to move along the arc-shaped slide groove (10). The second tension spring (13) moves with the movable block (11) and forms a second elastic tensile deformation area.

6. The yarn tension buffer spring structure according to claim 5, characterized in that: The preload of the second tension spring (13) is greater than that of the first tension spring (8) so that when the lever (3) swings slightly, it is in the first working state, and when the lever (3) swings significantly, the second tension spring (13) intervenes synchronously and is in the second working state.

7. The yarn tension buffer spring structure according to claim 6, characterized in that: The adjusting component includes a sliding plate (16) fixedly mounted on the mounting bracket (1). A slider (18) is slidably connected to the sliding cavity of the sliding plate (16) through symmetrically arranged guide rods (17). A screw (19) is arranged in the sliding cavity of the sliding plate (16) and between the two sets of guide rods (17). The slider (18) is threadedly connected to the screw (19). One end of the screw (19) is rotatably connected to the inner wall of the sliding plate (16), and the other end of the screw (19) passes through the sliding plate (16) and is fixedly mounted with a rotating wheel (20). When the rotating wheel (20) is turned, the screw (19) rotates and drives the slider (18) to move along the path of the guide rods (17).

8. The yarn tension buffer spring structure according to claim 7, characterized in that: A fixing plate (21) is fixedly connected to the slider (18). A insertion groove (22) is provided on the fixing plate (21). A magnetic block (23) is fixedly installed on the bottom wall of the insertion groove (22). Placement holes (24) are provided in the insertion groove (22) at equal intervals. A sleeve (25) is fixedly installed in the placement hole (24). A sliding rod (26) is slidably connected in the sleeve (25). A spring (27) is provided in the sleeve (25). The two ends of the spring (27) are connected to the inner wall of the sleeve (25) and the sliding rod (26) respectively. A pressing head (28) is fixedly connected to the end of the sliding rod (26).

9. A yarn tension buffer spring structure according to claim 8, characterized in that: The second bracket (9) is fixedly connected with a positioning rod (29) that matches the insertion slot (22). The positioning rod (29) is provided with abutment grooves (30) that match the abutment head (28) at equal intervals in the ring. The positioning rod (29) is also provided with a buckling groove (31) that matches the abutment groove (30) at equal intervals in the ring. The buckling groove (31) is connected to the corresponding abutment groove (30). A pad (3) for anti-slip is fixedly installed in the buckling groove (31). 2) A magnetic sheet (33) that is compatible with the magnetic block (23) is fixedly connected to the positioning rod (29). When the positioning rod (29) is inserted into the insertion slot (22), the pressing head (28) is in the pressing groove (30) to form a preliminary positioning area. When the magnetic sheet (33) and the magnetic block (23) are magnetically attracted, the second bracket (9) is rotated to make the pressing head (28) slide into the fastening groove (31) and abut against the pressing head (28) through the gasket (32) to form a stable positioning area.

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