A stable knitting mechanism for fiber synergic knitting

Abstract

The application relates to the technical field of textile machinery and discloses a stable knitting mechanism for fiber cooperative weaving, which comprises an inertia yarn feeding assembly and a linkage forming assembly; the inertia yarn feeding assembly comprises a motor, a central shaft, a supporting disc, an outer rotating drum, a concave sleeve disc and a volute spring; the output end of the motor is connected with the central shaft, and the supporting disc is fixedly connected on the central shaft; the concave sleeve disc is fixed at the inner sides of the two end heads of the outer rotating drum, and the supporting disc and the concave sleeve disc cooperate to rotate and support the outer rotating drum outside the central shaft. Through mechanical cooperation of the inertia yarn feeding assembly and the linkage forming assembly, the yarn breaking problem of high modulus fibers in the three-dimensional weaving process is solved; the elastic coupling structure between the central shaft and the outer rotating drum is utilized to convert the acceleration change of the driving motor into the relative rotation angle between the two, and then the rigid pulling bar is driven to retract radially through the eccentric wheel, the connecting rod and the sliding block mechanism.

Description

Technical Field

[0001] This invention relates to the field of textile machinery technology, and in particular to a stable knitting mechanism for fiber co-weaving. Background Technology

[0002] With advancements in textile materials technology, high-modulus fibers such as hemp and carbon fiber are widely used in the manufacture of high-performance composite materials and functional textiles due to their excellent mechanical properties. These fibers typically possess high rigidity and low elongation, making them extremely sensitive to changes in tension during the weaving process.

[0003] In existing knitting equipment, to achieve fabrics with a three-dimensional embossed feel or complex three-dimensional structures, the yarn guide nozzle typically needs to perform a large-amplitude Z-axis movement to coordinate with the knitting motion of the needle bed. However, traditional electronic yarn feeding systems mainly rely on servo motors and tension sensors for closed-loop control. Due to the unavoidable time lag between sensor detection, signal processing, and motor execution, when the yarn guide nozzle performs high-frequency, large-amplitude Z-axis deep pressing movements, the electronic yarn feeding system often cannot respond in time on a millisecond scale and provide sufficient additional yarn length. This supply-demand side response delay can cause a sudden and sharp increase in yarn tension, which can easily lead to brittle fracture of high-modulus fibers or cause the fabric structure to spring back and deform due to excessive tension, severely restricting the production efficiency and yield of high-quality three-dimensional knitted products. Therefore, this invention provides a stable knitting mechanism with fiber co-weaving to address the shortcomings of the existing technology. Summary of the Invention

[0004] The purpose of this invention is to provide a stable knitting mechanism for fiber co-weaving, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a stable knitting mechanism for fiber cooperative weaving, comprising an inertial yarn feeding assembly and a linkage forming assembly;

[0006] The inertial yarn feeding assembly includes a motor, a central shaft, a support plate, an outer drum, a concave sleeve, and a spiral spring; the output end of the motor is connected to the central shaft, and the support plate is fixedly connected to the central shaft; the concave sleeve is fixed to the inner sides of the two ends of the outer drum, and the support plate cooperates with the concave sleeve to rotate and support the outer drum outside the central shaft; the spiral spring is connected between the central shaft and the outer drum.

[0007] The inertial yarn feeding assembly also includes a concave end plate, an eccentric wheel, a connecting rod, a groove, a slider, a tension bar, and a yarn guide sleeve; the concave end plate is fixed to both ends of the outer drum, and the yarn guide sleeve is embedded in the inner side of the two concave end plates; one of the concave end plates has a groove extending radially.

[0008] The eccentric wheel is fixedly mounted on the end of the central shaft, the slider is slidably mounted in the groove, and the two ends of the connecting rod are respectively hinged to the eccentric wheel and the slider; the tension bar is fixedly connected to the inner side of the yarn guide sleeve and one end of the tension bar is connected to the slider.

[0009] The linkage molding assembly includes an X-axis guide rail, a wave plate, a U-shaped mounting base, a movable bracket, a yarn feed nozzle, and a limiting block; a movable seat is provided on the X-axis guide rail, and the U-shaped mounting base is installed on the movable seat; the movable bracket is slidably installed in the U-shaped mounting base in the vertical direction, and the yarn feed nozzle is fixed to the bottom end of the movable bracket;

[0010] The movable bracket has guide protrusions on both sides, which constitute the limiting block; the side wall of the U-shaped mounting base has a vertical strip-shaped limiting hole, and the limiting block is slidably engaged in the strip-shaped limiting hole;

[0011] The wave plate extends along the X-axis guide rail, and the movable bracket is provided with an abutting component, which always abuts against the trajectory surface of the wave plate.

[0012] Preferably, the surface of the yarn guide sleeve is provided with a continuous surface for yarn winding, and the yarn guide sleeve is provided with an movable area corresponding to the position of the pull bar; when the slider moves along the groove, the slider pulls the pull bar, and the pull bar causes the connection of the yarn guide sleeve to be recessed inward, thereby changing the effective yarn feeding circumference of the outer drum.

[0013] Preferably, a bearing structure is provided between the outer circumferential surface of the support disk and the inner concave surface of the concave sleeve disk, so that the outer drum can generate a rotational phase difference relative to the central axis; the spiral spring is located between the two support disks or in the space enclosed by the support disk and the concave sleeve disk.

[0014] Preferably, the pull bar is a rigid long strip structure; the pull bar extends along the axial direction of the yarn guide sleeve and is fixed to the inner side of the yarn guide sleeve; the movement of the slider synchronously drives the corresponding part of the yarn guide sleeve to generate radial displacement through the rigid pull bar.

[0015] Preferably, the linkage molding assembly further includes a Y-axis guide rail; both ends of the X-axis guide rail are connected to the Y-axis guide rail, and the corrugated plate is fixed below the X-axis guide rail by a bracket and is parallel to the X-axis guide rail.

[0016] Preferably, the abutment component includes a roller rotatably mounted on the side of the movable bracket; the rolling surface of the roller contacts the lower surface of the wave plate.

[0017] Preferably, the linkage molding assembly further includes a tension spring; one end of the tension spring is connected to the U-shaped mounting base, and the other end is connected to the movable bracket; the tension spring applies tension to lift the movable bracket upward, thereby keeping the roller in close contact with the lower surface of the wave plate.

[0018] Preferably, the sliding stroke of the limiting block within the strip-shaped limiting hole determines the maximum displacement of the movable bracket in the vertical direction; the cross-sectional shape of the limiting block matches the groove width of the strip-shaped limiting hole to restrict the rotation of the movable bracket around the vertical axis.

[0019] Preferably, the eccentric wheel and the connecting rod, as well as the connecting rod and the slider, are connected by a pivot joint formed by a pin; the groove of the concave end plate is a dovetail groove or a T-groove, and the shape of the slider is adapted to the groove.

[0020] Preferably, the wave plate has a wave trajectory that undulates continuously along its length; when the movable seat drives the U-shaped mounting seat to move along the X-axis, the wave plate forces the movable bracket to generate reciprocating motion in the Z-axis direction, and at the same time, the angular acceleration change generated by the motor adjusts the yarn tension through the tension bar.

[0021] In summary, the present invention has at least one of the following beneficial technical effects:

[0022] 1. This invention solves the problem of yarn breakage in the three-dimensional weaving process of high-modulus fibers by mechanically coordinating the inertial yarn feeding assembly and the linkage forming assembly. The mechanism utilizes the elastic coupling structure between the central shaft and the outer drum to convert the acceleration change of the drive motor into the relative rotation angle between the two. Then, through the eccentric wheel, connecting rod and slider mechanism, the rigid tension bar is driven to retract radially, instantly reducing the effective yarn feeding circumference of the guide sleeve. The inertial mechanical compensation method has extremely high response speed and can be precisely matched in time with the Z-axis deep pressing action of the downstream yarn feed nozzle driven by the wave plate, realizing instantaneous adaptive adjustment of the yarn supply and effectively avoiding fiber breakage caused by sudden tension changes.

[0023] 2. This invention uses the wave plate trajectory to force the yarn feeder to move in the Z-axis, ensuring the geometric accuracy of the three-dimensional forming structure. In the linkage forming component, the rollers, under the action of the tension spring, always roll close to the undulating trajectory of the wave plate, directly converting the horizontal displacement in the X-axis direction into the vertical displacement in the Z-axis direction, driving the yarn feeder to perform forced deep pressing or lifting. At the same time, with the guide and limiting structure of the strip-shaped limiting hole and the limiting block, it not only ensures the uniqueness and stability of the motion trajectory, but also prevents the mechanism from derailing or overloading during high-speed operation, significantly improving the forming quality and production stability of complex three-dimensional fabrics.

[0024] 3. This invention improves the reliability and durability of tension adjustment by adopting a rigid tension bar combined with a yarn guide sleeve. The rigid tension bar is axially fitted and fixed to the inner side of the yarn guide sleeve, which can uniformly convert the single-point driving force of the slider into the overall deformation or displacement of the yarn guide sleeve surface, avoiding deformation lag or work loss caused by flexible transmission. The outer drum is suspended outside the central shaft by a double-point support structure of the support plate and the concave sleeve plate. With the help of the internal spiral spring, it not only has a compact structure and makes effective use of the internal space, but also ensures the coaxiality and dynamic balance stability of the rotating parts during high-speed differential operation. Attached Figure Description

[0025] Figure 1 This is a front perspective view of the present invention;

[0026] Figure 2 This is a bottom-view perspective view of the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of the outer drum of the present invention;

[0028] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0029] Figure 5 This is a schematic diagram of the concave sleeve of the present invention;

[0030] Figure 6 This is a schematic diagram of the concave end plate of the present invention;

[0031] Figure 7 for Figure 6 Enlarged view of point B in the middle;

[0032] Figure 8 This is a schematic diagram of the internal structure of the outer drum of the present invention;

[0033] Figure 9 This is a schematic diagram of the U-shaped mounting base of the present invention.

[0034] The components are as follows: 1. Motor; 2. Central shaft; 3. Support plate; 4. Outer drum; 5. Concave sleeve; 6. Spiral spring; 7. Concave end plate; 8. Eccentric wheel; 9. Connecting rod; 10. Slide groove; 11. Slider; 12. Pull bar; 13. Yarn guide sleeve; 14. Y-axis guide rail; 15. X-axis guide rail; 16. Wave plate; 17. U-shaped mounting base; 18. Strip-shaped limiting hole; 19. Movable bracket; 20. Yarn feed nozzle; 21. Tension spring; 22. Roller; 23. Limit block. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1 - Appendix Figure 9 The present invention will be further described in detail below.

[0036] This invention provides a stable knitting mechanism for fiber co-weaving, mainly composed of an inertial yarn supply assembly and a linkage forming assembly. The inertial yarn supply assembly serves as the yarn supply end, and its power source is a motor 1. The output shaft of the motor 1 is fixedly connected to the central shaft 2 through a coupling. The central shaft 2 is the active rotating component of the entire yarn supply assembly. In order to realize the differentiated utilization of rotational inertia, the outer drum 4 is not directly rigidly fixed on the central shaft 2, but is coaxially sleeved on the outside of the central shaft 2 through a bearing structure. The specific support structure includes a support plate 3 and a concave sleeve plate 5. The support plate 3 is fixedly connected to the central shaft 2 and rotates synchronously with the central shaft 2. The concave sleeve plate 5 is fixed on the inner side of the two ends of the outer drum 4. The outer circumferential surface of the support plate 3 cooperates with the inner concave surface of the concave sleeve plate 5 to rotate and support the outer drum 4 on the outside of the central shaft 2, so that the outer drum 4 has the freedom to generate a rotational phase difference relative to the central shaft 2.

[0037] A spiral spring 6 is connected between the central shaft 2 and the outer drum 4. The spiral spring 6 is located between the two support disks 3 or in the internal space enclosed by the support disk 3 and the concave sleeve disk 5. The inner end of the spiral spring 6 is fixed to the central shaft 2, and the outer end is fixed to the inner wall of the outer drum 4. As an elastic coupling element, the spiral spring 6 transmits torque to make the two rotate synchronously during steady-state operation, and allows the two to generate relative rotation angles during non-steady-state operation.

[0038] The external structure of the inertial yarn feeding assembly includes concave end plates 7 fixed at both ends of the outer drum 4. The yarn guide sleeve 13 is embedded in the inner side of the two concave end plates 7, forming a cylindrical outer surface for winding the yarn. In order to achieve dynamic adjustment of yarn tension, an eccentric wheel 8 is fixedly provided at the end of the central shaft 2. The eccentric wheel 8 is located in the recessed space of the concave end plate 7. A radially extending groove 10 is provided on the end face of one of the concave end plates 7. The cross-sectional shape of the groove 10 is designed as a dovetail groove or a T-shaped groove to limit the slippage. The slider 11 is slidably disposed in the groove 10. The two ends of the connecting rod 9 are respectively hinged to the eccentric wheel 8 and the slider 11 by pins. When the central shaft 2 rotates relative to the outer drum 4, the eccentric position of the eccentric wheel 8 changes, and the connecting rod 9 drives the slider 11 to make radial linear motion along the groove 10.

[0039] A tension strip 12 is fixedly connected to the inner side of the yarn guide sleeve 13. The tension strip 12 is a rigid long strip structure that extends along the axial direction of the yarn guide sleeve 13 and fits and is fixed. One end of the tension strip 12 extends to the concave end plate 7 and is fixedly connected to the slider 11. The surface of the yarn guide sleeve 13 has an active area or opening corresponding to the position of the tension strip 12, or the yarn guide sleeve 13 itself has a certain deformation capability. When the slider 11 moves towards the center, the slider 11 synchronously drives the corresponding part of the yarn guide sleeve 13 to be concave inward through the rigid tension strip 12, thereby reducing the effective yarn feeding circumference of the outer drum 4.

[0040] The linkage forming component, as the yarn consumption end, includes an X-axis guide rail 15 and a Y-axis guide rail 14. The two ends of the X-axis guide rail 15 are connected to the Y-axis guide rail 14 to form a planar motion coordinate system. The movable seat is slidably set on the X-axis guide rail 15. The U-shaped mounting seat 17 is fixedly installed on the movable seat. The movable bracket 19 passes through the U-shaped mounting seat 17 and can generate sliding displacement in the vertical direction. The two side walls of the U-shaped mounting seat 17 are symmetrically provided with vertical strip-shaped limiting holes 18. The movable bracket 19 is provided with guide protrusions on both sides. The guide protrusions form limiting blocks 23. The limiting blocks 23 are slidably engaged in the strip-shaped limiting holes 18. The cross-sectional shape of the limiting blocks 23 matches the groove width of the strip-shaped limiting holes 18, which not only restricts the rotation of the movable bracket 19, but also limits the limit stroke of the movable bracket 19 in the Z-axis direction through the length of the strip-shaped limiting holes 18.

[0041] The yarn feeder 20 is fixed to the bottom of the movable bracket 19 and is used to guide the yarn into the knitting area. In order to control the Z-axis movement trajectory of the yarn feeder 20, a wave plate 16 is arranged parallel below the X-axis guide rail 15. The wave plate 16 is fixed by the bracket and has a wave trajectory that undulates continuously along the length direction. The movable bracket 19 is provided with an abutment component, which includes a roller 22 rotatably mounted on the side of the movable bracket 19. A tension spring 21 is connected between the U-shaped mounting seat 17 and the movable bracket 19. The tension spring 21 applies an upward tension force so that the movable bracket 19 always maintains an upward trend, thereby ensuring that the rolling surface of the roller 22 is always in close contact with the lower surface of the wave plate 16.

[0042] Working principle: During regular plain weave knitting, motor 1 drives the central shaft 2 to rotate at a constant speed or low acceleration. The spiral spring 6 is in a torque balance state, locking the relative position of the central shaft 2 and the outer drum 4. The two rotate synchronously. At this time, the eccentric wheel 8 is stationary relative to the concave end plate 7. The connecting rod 9 supports the slider 11 at the far end of the slide groove 10. The tension bar 12 is kept in the maximum extension state. The yarn guide sleeve 13 maintains the standard diameter and provides stable yarn tension. At the same time, the moving seat moves on the X-axis guide rail 15, the roller 22 rolls on the straight section of the wave plate 16, and the yarn feed nozzle 20 is kept at the standard height.

[0043] During the three-dimensional sawtooth structure weaving, the control system issues a command, and the moving seat drives the U-shaped mounting seat 17 to move quickly to the waveform phase point. The roller 22 enters the trough or convex section of the wave plate 16. The trajectory surface of the wave plate 16 forces the roller 22 to move downward, overcoming the resistance of the tension spring 21, and driving the movable bracket 19 and the yarn feeder 20 to produce an instantaneous downward movement in the Z-axis direction. This deep pressing action increases the yarn path length, resulting in a sharp increase in yarn tension.

[0044] At the same time, the motor 1 executes a rapid positive acceleration command in coordination, the central shaft 2 obtains a large angular acceleration, while the outer drum 4 and the yarn wound on it have a large moment of inertia, causing the rotational speed of the outer drum 4 to lag behind that of the central shaft 2. The central shaft 2 and the outer drum 4 overcome the damping of the spiral spring 6 to generate a relative rotation angle. At this time, the eccentric wheel 8 at the end of the central shaft 2 rotates relative to the concave end plate 7 on the outer drum 4. This relative rotation pulls the slider 11 along the slide groove 10 to quickly retract towards the center through the connecting rod 9. The slider 11 drives the rigid tension bar 12 to move inward synchronously, and the tension bar 12 drives the connecting part of the yarn guide sleeve 13 to be recessed inward.

[0045] The above operation causes the effective yarn feeding circumference of the outer drum 4 to decrease instantaneously, or reduces the tightness of the fit between the yarn and the surface of the outer drum 4, thereby physically releasing a section of yarn length. This released yarn length compensates for the yarn length consumed by the downward movement of the downstream feed nozzle 20, thus maintaining the tension stability of the high modulus fiber and preventing yarn breakage. When the acceleration ends and the speed returns to uniformity, the spiral spring 6 resets, the outer drum 4 returns to its standard diameter, the feed nozzle 20 resets along the trajectory of the wave plate 16, and the overall mechanism returns to a steady state.

Claims

1. A stable knitting mechanism for fiber cooperative weaving, characterized in that, Includes inertial yarn feeding assembly and linkage forming assembly; The inertial yarn feeding assembly includes a motor (1), a central shaft (2), a support plate (3), an outer drum (4), a concave sleeve plate (5), and a spiral spring (6); the output end of the motor (1) is connected to the central shaft (2), and the support plate (3) is fixedly connected to the central shaft (2); the concave sleeve plate (5) is fixed to the inner side of the two ends of the outer drum (4), and the support plate (3) and the concave sleeve plate (5) cooperate to rotate and support the outer drum (4) outside the central shaft (2); the spiral spring (6) is connected between the central shaft (2) and the outer drum (4); The inertial yarn feeding assembly also includes a concave end plate (7), an eccentric wheel (8), a connecting rod (9), a groove (10), a slider (11), a tension bar (12), and a yarn guide sleeve (13); the concave end plate (7) is fixed to the outer ends of the outer drum (4), and the yarn guide sleeve (13) is embedded in the inner side of the two concave end plates (7); one of the concave end plates (7) has a groove (10) extending radially. The eccentric wheel (8) is fixedly disposed at the end of the central shaft (2), the slider (11) is slidably disposed in the groove (10), and the two ends of the connecting rod (9) are respectively hinged to the eccentric wheel (8) and the slider (11); the pulling strip (12) is fixedly connected to the inner side of the yarn guide sleeve (13) and one end of the pulling strip (12) is connected to the slider (11); The linkage molding assembly includes an X-axis guide rail (15), a wave plate (16), a U-shaped mounting base (17), a movable bracket (19), a yarn feeder (20), and a limiting block (23); the X-axis guide rail (15) is provided with a movable seat, and the U-shaped mounting base (17) is mounted on the movable seat; the movable bracket (19) is slidably mounted in the U-shaped mounting base (17) in the vertical direction, and the yarn feeder (20) is fixed to the bottom end of the movable bracket (19); The movable bracket (19) has guide protrusions on both sides, and the guide protrusions constitute the limiting block (23); the side wall of the U-shaped mounting base (17) has a vertical strip-shaped limiting hole (18), and the limiting block (23) is slidably engaged in the strip-shaped limiting hole (18). The wave plate (16) extends along the X-axis guide rail (15), and the movable bracket (19) is provided with an abutting component, which always abuts against the trajectory surface of the wave plate (16).

2. The stable knitting mechanism for fiber cooperative weaving according to claim 1, characterized in that, The surface of the yarn guide sleeve (13) is provided with a continuous surface for yarn winding, and the yarn guide sleeve (13) is provided with an active area corresponding to the position of the pull bar (12); when the slider (11) moves along the slide groove (10), the slider (11) pulls the pull bar (12), and the pull bar (12) causes the connection of the yarn guide sleeve (13) to be recessed inward, thereby changing the effective yarn feeding circumference of the outer drum (4).

3. The stable knitting mechanism for fiber cooperative weaving according to claim 1, characterized in that, A bearing structure is provided between the outer circumferential surface of the support disk (3) and the inner concave surface of the concave sleeve disk (5), so that the outer drum (4) can generate a rotational phase difference relative to the central axis (2); the spiral spring (6) is located between the two support disks (3) or in the space enclosed by the support disk (3) and the concave sleeve disk (5).

4. The stable knitting mechanism for fiber cooperative weaving according to claim 1, characterized in that, The pull bar (12) is a rigid long bar structure; the pull bar (12) extends along the axial direction of the yarn guide sleeve (13) and is attached and fixed to the inner side of the yarn guide sleeve (13); the movement of the slider (11) drives the corresponding part of the yarn guide sleeve (13) to generate radial displacement through the rigid pull bar (12).

5. A stable knitting mechanism for fiber cooperative weaving according to claim 1, characterized in that, The linkage molding assembly also includes a Y-axis guide rail (14); the two ends of the X-axis guide rail (15) are connected to the Y-axis guide rail (14), and the wave plate (16) is fixed below the X-axis guide rail (15) by a bracket and is parallel to the X-axis guide rail (15).

6. The stable knitting mechanism for fiber cooperative weaving according to claim 1, characterized in that, The abutment assembly includes a roller (22) rotatably mounted on the side of the movable bracket (19); the rolling surface of the roller (22) contacts the lower surface of the wave plate (16).

7. A stable knitting mechanism for fiber cooperative weaving according to claim 6, characterized in that, The linkage molding assembly also includes a tension spring (21); one end of the tension spring (21) is connected to the U-shaped mounting base (17), and the other end is connected to the movable bracket (19); the tension spring (21) applies tension to lift the movable bracket (19) upward, thereby keeping the roller (22) in close contact with the lower surface of the wave plate (16).

8. The stable knitting mechanism for fiber cooperative weaving according to claim 1, characterized in that, The sliding stroke of the limiting block (23) within the strip-shaped limiting hole (18) determines the maximum displacement of the movable bracket (19) in the vertical direction; the cross-sectional shape of the limiting block (23) matches the groove width of the strip-shaped limiting hole (18) to restrict the rotation of the movable bracket (19) around the vertical axis.

9. A stable knitting mechanism for fiber cooperative weaving according to claim 1, characterized in that, The eccentric wheel (8) and the connecting rod (9), as well as the connecting rod (9) and the slider (11), are connected by a rotating pair through a pin; the groove (10) of the concave end plate (7) is a dovetail groove or a T-groove, and the shape of the slider (11) is adapted to the groove (10).

10. A stable knitting mechanism for fiber cooperative weaving according to claim 1, characterized in that, The wave plate (16) has a wave trajectory that undulates continuously along the length direction; when the moving seat drives the U-shaped mounting base (17) to move along the X-axis, the wave plate (16) forces the movable bracket (19) to generate reciprocating motion in the Z-axis direction, and at the same time, the angular acceleration change generated by the motor (1) adjusts the yarn tension through the tension bar (12).

Images