Adjustable tension three-dimensional braiding carrier

Abstract

This invention relates to an adjustable tension three-dimensional knitting yarn carrier, comprising a mounting frame, a yarn guide, and a rotating shaft. The mounting frame has a rotational damping mechanism and a damping adjustment mechanism on its left and right sides, respectively. The rotational damping mechanism includes a yarn bobbin, a coil spring, and a coil spring sleeve. A coil spring, a coil spring sleeve, and a yarn bobbin are sequentially fitted onto the outer side of one end of the rotating shaft. The two legs of the coil spring are fixed to the rotating shaft and the coil spring sleeve, respectively. The coil spring sleeve and the yarn bobbin are fixedly connected. The damping adjustment mechanism includes a pressure rod, a pressure plate, a counter-rotating wave spring, a pressure plate, and a connecting screw. The other end of the rotating shaft is inserted into the pressure rod, which can rotate with the rotating shaft. The pressure rod is fixed to one side of the pressure plate. The counter-rotating wave spring is installed between the mounting frame and the pressure plate. The pressure plate is fixed to the mounting frame by the connecting screw, and the pressure plate presses tightly against the pressure plate. The counter-rotating wave spring is sleeved on the pressure rod. This invention can achieve uniform and adjustable yarn tension while greatly increasing the yarn feed rate, thereby improving the knitting quality of three-dimensional knitted fabrics.

Description

Technical Field

[0001] This invention relates to yarn carriers, and more specifically, to an adjustable tension three-dimensional knitting yarn carrier. Background Technology

[0002] Three-dimensional weaving technology has become an important method for preparing composite materials in recent years, especially for fabricating high-performance structural components. It overcomes the weakness of traditional laminated composites, which are prone to delamination, by weaving yarns together in space to create prefabricated components with high integrity and excellent performance. In three-dimensional weaving equipment, the yarn carrier is a crucial component for ensuring the quality of the woven fabric.

[0003] Three-dimensional knitting yarn carriers are required to have the functions of storing, releasing, and retrieving yarn, as well as maintaining yarn tension. Most existing three-dimensional knitting yarn carriers use the force of compression springs or limiting weights to maintain tension during yarn release. For example, Chinese patent CN111809295A uses vertical compression of springs to maintain tension. However, the stroke of the compression spring is relatively small. If the height of the yarn carrier is forcibly increased, the center of gravity is raised, which will have an adverse effect on the operation of the equipment. Some improved yarn carriers use active devices to realize yarn release and retrieving. Although theoretically they can better meet the process requirements, this type of yarn carrier requires a large installation space, which leads to the need to expand the knitting equipment and greatly increases the production cost. Therefore, it is not suitable for actual production. Chinese patent CN104805591A uses a coil spring to increase the amount of yarn feeding and returning in the yarn carrier, but the amount of yarn feeding is still limited, and the overall device is complex, requiring a large installation space. It has defects such as the overall center of gravity shifting upward and the yarn feeding not being smooth, which can easily affect the forming quality of the knitted parts. Moreover, the working state close to the limit number of turns causes great wear and tear on the coil spring, which needs to be replaced frequently, increasing the cost. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an adjustable tension three-dimensional knitting yarn carrier that can ensure that the working state of the coil spring is always within the desired number of turns, and achieve uniform and adjustable tension of the knitting yarn while greatly increasing the yarn release, thereby improving the knitting quality of three-dimensional knitted fabrics.

[0005] The technical solution adopted by this invention to solve its technical problem is as follows: An adjustable tension three-dimensional knitting yarn carrier is constructed, including a mounting frame and a yarn guide and a rotating shaft mounted on the mounting frame. A rotational damping mechanism and a damping adjustment mechanism are respectively provided on the left and right sides of the mounting frame. The rotational damping mechanism includes a yarn bobbin, a coil spring, and a coil spring sleeve. A coil spring, a coil spring sleeve, and a yarn bobbin are sequentially fitted onto the outer side of one end of the rotating shaft. The two legs of the coil spring are respectively fixed to the rotating shaft and the coil spring sleeve. The coil spring sleeve and the yarn bobbin are fixedly connected by a positioning groove and an R-shaped pin. The damping adjustment mechanism includes a pressure rod, a pressure plate, a counter-wave spring, a pressure plate, and a connecting screw. The other end of the rotating shaft is inserted into the pressure rod. The pressure rod can rotate with the rotating shaft. The pressure rod is fixed to one side of the pressure plate. The counter-wave spring is installed between the mounting frame and the pressure plate. The pressure plate is fixed to the mounting frame by the connecting screw. The pressure plate tightly presses against the pressure plate. The counter-wave spring is sleeved on the pressure rod.

[0006] According to the above scheme, the rotating shaft is connected to the spring cylinder through a bearing, the end of the spring cylinder is provided with a spring cover, and a positioning pin hole is machined on the spring cylinder near the spring cover.

[0007] According to the above scheme, the coiling spring cylinder is provided with a coiling spring groove for mounting the outer end support foot of the coiling spring, the rotating shaft is provided with a preset slot for mounting the support foot of the coiling spring, and the yarn bobbin is provided with a locking groove that cooperates with the outer protrusion of the coiling spring groove. The yarn bobbin can be replaced at any time according to the yarn weaving length.

[0008] According to the above scheme, the rotating shaft is provided with a first limiting hole and a second limiting hole for inserting a positioning pin, and a square shoulder is machined on the left side of the rotating shaft near the mounting bracket.

[0009] According to the above scheme, the end of the rotating shaft is provided with a square hole for cooperating with the pressure rod, and the pressure rod can be processed into different lengths according to the spring preload requirements to achieve adjustable damping.

[0010] According to the above scheme, the pressure plate is provided with four through holes corresponding to the mounting bracket. The connecting screw is inserted into the corresponding through hole, screwed into the threaded hole on the mounting bracket, and fixed by a nut.

[0011] According to the above scheme, the mounting frame is an L-shaped horizontal structure. The mounting frame has a yarn guide mounting hole on the upper right side. The yarn guide can be a ceiling bolt or a guide pulley. The mounting frame has a fixing bolt hole at the bottom, which can be connected to different types of braided yarn spindles. A bearing hole is provided in the middle for fixing the rotating shaft.

[0012] The adjustable tension three-dimensional knitting yarn carrier of the present invention has the following beneficial effects:

[0013] 1. This invention relaxes the coil spring by adding a damping adjustment mechanism, thereby greatly increasing the amount of yarn released and allowing the yarn tension to be adjusted as needed, thus improving the overall weaving quality and weaving length.

[0014] 2. This invention uses a damping adjustment mechanism to intermittently relax one end of the coil spring, thereby ensuring that the working state of the coil spring is always within the desired number of turns, and the generated torque is within the corresponding range, ensuring that the yarn tension is uniform and adjustable during the weaving process.

[0015] 3. The present invention adopts a horizontal structure, which reduces the overall height and lowers the center of gravity, making the yarn carrier run more stably; it does not require power connection mechanisms such as gears, contains fewer parts, has lower cost, has a compact structure and reliable operation, occupies less space, and has a lower cost. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0017] Figure 1 This is a schematic diagram of the three-dimensional knitting yarn carrier of the present invention.

[0018] Figure 2 This is a structural diagram of the mounting bracket;

[0019] Figure 3 This is a schematic diagram of the yarn bobbin structure;

[0020] Figure 4 This is a structural diagram of the coil spring sleeve and coil spring cover (the coil spring is not shown).

[0021] Figure 5 This is a structural diagram of the rotating shaft, pressure rod, and pressure plate;

[0022] Figure 6 This is a schematic diagram of the damping adjustment mechanism;

[0023] Figure 7 This is a schematic diagram of the damping adjustment mechanism in another embodiment of the present invention. Detailed Implementation

[0024] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0025] like Figure 1 As shown, the present invention provides a compact and reliable three-dimensional knitting yarn carrier, including a mounting frame 1, a yarn guide 7, a rotating shaft 19, a rotational damping mechanism 2, and a damping adjustment mechanism 6. The rotational damping mechanism 2 includes a yarn bobbin 12, a coil spring, and a coil spring sleeve 15. The damping adjustment mechanism 6 includes a pressure rod 21, a pressure plate 22, a counter-rotating wave spring 23, a pressure plate 25, and a connecting screw 5.

[0026] like Figure 2 As shown, the mounting bracket 1 has a threaded hole 10 at its bottom for connection to the spindle of a braiding machine. To ensure connection strength, a countersunk hole 11 is machined on it to place a gasket and a spring washer to ensure even force distribution. The other end has a yarn guide hole and a yarn guide 7 for easy yarn release and recovery. If necessary, guide pulleys and other devices can be installed to further reduce yarn wear. The yarn guide hole should be as close as possible to the tangential direction of the outer edge of the yarn bobbin 12 to facilitate smoother yarn release.

[0027] like Figure 3 and Figure 4 As shown, the yarn bobbin 12 and the spring cylinder 15 are connected together via a positioning groove 13, allowing them to rotate synchronously and transmit rotational torque. Positioning holes are machined on the spring cylinder 15 to accommodate R-pins, preventing the yarn bobbin 12 from detaching from the spring cylinder 15. Another advantage of this design is that the yarn bobbin 12 can be easily removed and replenished when the yarn needs to be replaced. The rotating shaft 19 is connected to the spring cylinder 15 via bearings, and the end of the spring cylinder 15 is provided with a spring cover 14. The bearings are installed in corresponding bearing holes, and shoulders are machined at the bearing positions on the spring cylinder 15 and the spring cover 14 to prevent axial slippage of the bearings. The spring cylinder 15 has a spring groove 16 for mounting the outer end of the spring; the spring simply needs to be inserted. The other end of the spring is mounted on a pre-set slot 18 on the rotating shaft 19. Therefore, the relative movement of the spring cylinder 15 and the rotating shaft 19 causes the spring to tighten or loosen, thus providing rotational torque for rotational damping.

[0028] like Figure 5 As shown, the rotating shaft 19 is connected to the spring cover 14, the spring sleeve 15, and the mounting bracket 1 via bearings. One end of the rotating shaft 19 has a first limiting hole 20, into which an R-pin is inserted to prevent outward slippage. The other end has a square shoulder for positioning the spring sleeve 15 and preventing inward slippage. The shoulder and R-pin cooperate to achieve axial positioning of the rotating shaft 19. A second limiting hole 17 is also machined on the front side of the rotating shaft 19, with the same function as the first hole: inserting an R-pin to apply axial positioning to the spring sleeve 15, preventing it from detaching from the rotating shaft 19. A square hole is machined at the end of the rotating shaft 19 to cooperate with the pressure rod 21, allowing them to rotate synchronously. The pressure plate 22 also has a square hole in its center to cooperate with the pressure rod 21, thus the rotational torque is transmitted through the rotating shaft 19 to the pressure rod 21 and then to the pressure plate 22. The rotating shaft 19, pressure rod 21, and pressure plate 22 are machined separately for easy disassembly. The rotating shaft 19, pressure rod 21, and pressure plate 22 of the stressed components can be customized and processed later to achieve various forms of adjustable damping.

[0029] like Figure 6As shown, the pressure plate 25 has four through holes corresponding to the mounting bracket 1. The connecting screw 5 is inserted into the corresponding through holes and screwed into the threaded hole 8 on the mounting bracket 1. The nut 24 can be used for fixing, thereby realizing the connection between the pressure plate 25 and the mounting bracket 1. The top wave spring 23 is sleeved on the pressure rod 21, with its two ends abutting against the rear of the mounting bracket 1 and the flange plane on the pressure plate 22, respectively. Its axial positioning can be limited by the flange plane protrusion of the pressure plate 22. By continuously tightening the connecting screw 5, the distance between the pressure plate and the mounting bracket 1 is shortened. The reaction force generated by the top wave spring 23 acts on the flange surface, pressing the pressure plate 22 tightly onto the pressure plate 25. The shorter the distance, the greater the pressure of the top wave spring 23, and vice versa. The pressure generated by the top wave spring 23 will generate frictional resistance through friction when the rotating shaft 19 has a tendency to rotate, thereby limiting the rotation of the rotating shaft 19. Conversely, lengthening the connecting screw 5 will reduce the resistance. Therefore, the resistance generated by the rotation damping mechanism 2 can be adjusted as needed by shortening or lengthening the screw 5, thereby making the three-dimensional weaving yarn carrier more widely applicable.

[0030] The working principle of this invention is as follows:

[0031] After installing and arranging the yarn carrier according to the above assembly relationship, connect the bolts to the braiding spindle through the threaded holes. Next, pull out a certain length of yarn and connect it to the braiding machine's lifting mechanism. At this point, due to the initial amount of yarn pulled out, the coil spring will have some preload, but because the coil spring force is small and much less than the frictional force of the pressure plate of the damping adjustment mechanism, the rotating shaft remains stationary relative to the coil spring cylinder. Then, as the moving spindle moves planar on the yarn tray, it drives the yarn carrier to follow suit, and the yarn interweaves in space while the coil spring is gradually tightened.

[0032] As the lifting mechanism moves upward, the yarn is continuously pulled out, causing the yarn bobbin to rotate. At this point, the spring force is still relatively small and less than the frictional force of the pressure plate in the damping adjustment mechanism. The rotating shaft remains stationary, thus the spring is continuously tightened. As the number of spring coils increases, when it gradually exceeds the maximum static friction torque provided by the damping adjustment mechanism, the rotating shaft overcomes the resistance and rotates in the same direction as the spring bobbin. Since the dynamic friction is less than the static friction, the rotating shaft rotates faster than the spring bobbin, thereby relaxing the spring. At this point, the spring torque also begins to decrease. When the rotating shaft rotates a certain angle, because the torque provided by the spring is less than the frictional force of the pressure plate, the rotating shaft stops and remains stationary. At this point, the spring gradually tightens again, and the generated torque gradually increases. When it increases to exceed the maximum static friction torque provided by the damping adjustment mechanism, the rotating shaft repeats the above process. Therefore, the yarn tension variation range remains within a certain range. Compared with traditional three-dimensional knitting yarn carriers, this better ensures the forming quality of the knitted parts and increases the overall weaving length.

[0033] It is worth noting that the damping adjustment mechanism provided by the present invention includes, but is not limited to, a top-mounted wave spring. Figure 7 This is a schematic diagram of the damping mechanism in another embodiment of the present invention. The damping adjustment mechanism is primarily a hydraulic damping structure. Compared to a mechanical spring structure, the hydraulic damping mechanism is simpler and more compact. Furthermore, it performs significantly better than the mechanical spring structure at high torques. Therefore, a suitable structure can be selected based on the magnitude of the coil spring torque.

[0034] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. An adjustable tension three-dimensional knitting yarn carrier, comprising a mounting frame and a yarn guide and a rotating shaft disposed on the mounting frame, characterized in that, The mounting frame is equipped with a rotation damping mechanism and a damping adjustment mechanism on its left and right sides, respectively. The rotation damping mechanism includes a yarn bobbin, a coil spring, and a coil spring sleeve. A coil spring, a coil spring sleeve, and a yarn bobbin are sequentially fitted onto the outer side of one end of the rotating shaft. The two legs of the coil spring are fixed to the rotating shaft and the coil spring sleeve, respectively. The coil spring sleeve and the yarn bobbin are fixedly connected by a positioning groove and an R-shaped pin. The damping adjustment mechanism includes a pressure rod, a pressure plate, a counter-rotating wave spring, a pressure plate, and a connecting screw. The other end of the rotating shaft is inserted into the pressure rod, which rotates with the rotating shaft. The pressure rod is fixed to one side of the pressure plate. The counter-rotating wave spring is installed between the mounting frame and the pressure plate. The pressure plate is connected by a connecting screw. The rod is fixed to the mounting bracket, the pressure plate presses tightly against the pressure plate, and the opposing wave spring is sleeved on the pressure rod. The two ends of the opposing wave spring abut against the back of the mounting bracket and the flange plane on the pressure plate, respectively. Its axial positioning is limited by the flange plane protrusion of the pressure plate. By continuously tightening the connecting screw, the distance between the pressure plate and the mounting bracket is shortened. The reaction force generated by the opposing wave spring acts on the flange surface, pressing the pressure plate tightly against the pressure plate. The shorter the distance, the greater the pressure of the opposing wave spring, and vice versa. The pressure generated by the opposing wave spring will generate frictional resistance through friction when the rotating shaft tends to rotate, thereby limiting the rotation of the rotating shaft. Lengthening the connecting screw will reduce the resistance.

2. The adjustable tension three-dimensional knitting yarn carrier according to claim 1, characterized in that, The rotating shaft is connected to the spring cylinder via a bearing. The end of the spring cylinder is provided with a spring cover, and a positioning pin hole is machined on the spring cylinder near the spring cover.

3. The adjustable tension three-dimensional knitting yarn carrier according to claim 1, characterized in that, The coiling spring cylinder is provided with a coiling spring groove for mounting the outer end support foot of the coiling spring, the rotating shaft is provided with a preset slot for mounting the support foot of the coiling spring, and the yarn bobbin is provided with a retaining groove that cooperates with the outer protrusion of the coiling spring groove.

4. The adjustable tension three-dimensional knitting yarn carrier according to claim 1, characterized in that, The rotating shaft is provided with a first limiting hole and a second limiting hole for inserting a positioning pin, and a square shoulder is machined on the left side of the rotating shaft near the mounting bracket.

5. The adjustable tension three-dimensional knitting yarn carrier according to claim 1, characterized in that, The end of the rotating shaft is provided with a square hole for engaging with the pressure rod.

6. The adjustable tension three-dimensional knitting yarn carrier according to claim 1, characterized in that, The pressure plate has four through holes corresponding to the mounting bracket. The connecting screw is inserted into the corresponding through hole, screwed into the threaded hole on the mounting bracket, and fixed by a nut.

7. The adjustable tension three-dimensional knitting yarn carrier according to claim 1, characterized in that, The mounting frame has an overall L-shaped horizontal structure. The upper right side of the mounting frame has a yarn guide mounting hole. The yarn guide is a ceiling bolt or a guide pulley. The bottom of the mounting frame has a fixing bolt hole, and the middle of the mounting frame has a bearing hole for fixing the rotating shaft.

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