Circular weaving machine and weft insertion structure therefor

Abstract

The utility model discloses a kind of circular weaving machine and its weft guiding structure, including the interlacing mechanism for providing warp yarn, further including fixed support and the weft shuttle wheel and weft yarn cylinder assembled in fixed support, weft shuttle wheel ring is set in interlacing mechanism, and each other is close, the outer periphery of weft shuttle wheel has the yarn guide groove for guiding, limiting weft yarn, weft shuttle wheel can rotate around interlacing mechanism, weft yarn that weft yarn cylinder is pulled out is movably connected in yarn guide groove, and is sent to interlacing mechanism by yarn guide groove, and is interwoven with warp on interlacing mechanism, so it can be guided, limited to weft yarn by the yarn guide groove of weft shuttle wheel, to prevent abnormal phenomenon that weft yarn is wound when circular weaving machine is normally operated, to further ensure that circular weaving machine can continuous production and not stop.

Description

Technical Field

[0001] This utility model relates to the field of circular loom technology, and in particular to a circular loom and its weft insertion structure. Background Technology

[0002] A circular loom is a specialized piece of equipment that produces cylindrical woven fabrics in a highly efficient and continuous manner. It forms tubular fabrics by interlacing multiple sets of warp and weft yarns in a circumferential direction and is widely used in weaving industrial fabrics such as plastic woven bags, container bags, geotextiles, and tents.

[0003] In traditional circular looms, the weft yarn passes through the guide hole and is then drawn to the center of the weft shuttle for feeding. Therefore, the weft yarn does not have a fixed support point on the weft shuttle. Instead, it is fed to the interlacing mechanism of the circular loom through the connection point between the weft shuttle and the fixed support. This results in the interlacing point of the weft and warp yarns not being in the position closest to the interlacing mechanism. If the circular loom is running normally, the next working weft shuttle cannot push the interlacing yarn fed by the previous weft shuttle into the interlacing row close to the previous interlacing row, which will cause multiple weft yarns to become tangled together, thus causing the machine to stop. Utility Model Content

[0004] To address the aforementioned problems, this invention provides a circular loom and its weft insertion structure. The weft yarn is guided and limited by the yarn guide groove of the weft shuttle wheel to prevent the abnormal phenomenon of weft yarn entanglement during normal operation of the circular loom, thereby ensuring that the circular loom can produce continuously without stopping.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] This utility model provides a weft insertion structure for a circular loom, including an interlacing mechanism for providing warp yarns, a fixed bracket, and a weft shuttle and a weft yarn bobbin assembled on the fixed bracket; the weft shuttle is arranged around the interlacing mechanism and is in close contact with each other; the outer circumferential surface of the weft shuttle has a yarn guide groove for guiding and limiting the weft yarn; the weft shuttle can rotate around the interlacing mechanism, and the weft yarn drawn from the weft yarn bobbin is movably connected to the yarn guide groove and is sent to the interlacing mechanism through the yarn guide groove, and interlaced with the warp yarns on the interlacing mechanism.

[0007] Furthermore, the depth of the yarn guide groove is 1mm to 8mm.

[0008] Furthermore, the width of the yarn guide groove is 1mm to 3mm.

[0009] Furthermore, the surface roughness of the groove wall of the yarn guide groove is ≤0.2μm.

[0010] Furthermore, the cross-sectional shape of the yarn guide groove is U-shaped.

[0011] Furthermore, the weft shuttle is a rigid weft shuttle.

[0012] Furthermore, the rigid shuttle is a metal shuttle.

[0013] Furthermore, the weft shuttle is annular in shape.

[0014] Furthermore, the outer wall of the weft shuttle is a smooth surface.

[0015] This utility model provides a circular loom, which includes at least the weft insertion structure of the circular loom described above.

[0016] The technical solution provided by this utility model has the following beneficial effects:

[0017] The weft yarn is guided and limited by the guide groove of the weft shuttle wheel. When the circular loom is running normally, the weft yarn pulled out from the weft yarn bobbin is movably connected to the guide groove and then sent to the interlacing mechanism through the guide groove. At this time, the wheel surface of the weft shuttle wheel is in close contact with the working surface of the interlacing mechanism to ensure that the yarn can interlac with the warp yarn on the interlacing mechanism smoothly. This can prevent the abnormal phenomenon of weft yarn entanglement and thus ensure that the circular loom can produce continuously without stopping. Attached Figure Description

[0018] Figure 1 The diagram shown is a schematic of the weft insertion structure of the circular loom in Embodiment 1;

[0019] Figure 2 The image shown is a cross-sectional view of the weft shuttle in Embodiment 1;

[0020] Figure 3 The diagram shown is a schematic representation of the circular loom in Embodiment 2.

[0021] Figure 4 The diagram shown is a top view of the circular loom in Example 2. Detailed Implementation

[0022] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0023] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0024] Example 1

[0025] Reference Figure 1 and Figure 2 Example 1 provides a weft insertion structure (hereinafter referred to as weft insertion structure) for a circular loom, which guides and transports multiple weft yarns 5 to the interlacing mechanism 4 of the circular loom, and interlaces them with the warp yarns on the interlacing mechanism 4 in the circumferential direction to form a tubular fabric.

[0026] like Figure 1 As shown, the weft insertion structure of this embodiment includes an interlacing mechanism 4 for providing warp yarns, multiple fixed supports 2, and multiple weft shuttles 3 and weft yarn cylinders 1 assembled on each fixed support 2. Each fixed support 2, together with its corresponding weft shuttle 3 and weft yarn cylinder 1, can rotate circumferentially around the interlacing mechanism 4. The interlacing mechanism 4 is a prior art and will not be described in detail here.

[0027] Multiple weft shuttles 3 are arranged in a ring around the interlacing mechanism 4, and the working surfaces 41 of each weft shuttle 3 and the interlacing mechanism 4 are in close contact with each other.

[0028] Also, such as Figure 2 As shown, each weft shuttle 3 has a guide groove 31 on its outer peripheral surface for guiding and limiting the weft yarn 5. The weft yarn 5 pulled out from the weft yarn cylinder 1 is movably connected to the guide groove 31 of each weft shuttle 3, and is sent to the interlacing mechanism 4 through the guide groove 31, and interlaced with the warp yarn on the interlacing mechanism 4.

[0029] In this embodiment, as Figure 2 As shown, the weft shuttle 3 is a rigid weft shuttle in the shape of a ring, such as a mold steel metal weft shuttle, used to replace the polyurethane weft shuttle used in the prior art to provide rigid support, thereby ensuring the overall structural stability and service life of the weft shuttle 3, and also able to adapt to long-term high-frequency yarn feeding operations and different raw material weaving scenarios.

[0030] More specifically, such as Figure 2 As shown, the cross-sectional shape of the yarn guide groove 31 is U-shaped to ensure that the weft yarn 5 can be movably wound around the inner wall of the yarn guide groove 31, so as to always confine the weft yarn 5 within the yarn guide groove 31 and improve the problem of weft yarn 5 offset and compression, thereby forming a rigid weft yarn 5 track for precise yarn feeding.

[0031] When the circular loom is running normally, each weft yarn 5 is drawn out from the weft yarn cylinder 1 and extends through the guide hole on the fixed bracket 2 until it is movably connected to the yarn guide groove 31 of the weft shuttle wheel 3. Since the wheel surface of the weft shuttle wheel 3 close to the working surface 41 of the interlacing mechanism 4 is in close contact with the working surface 41 of the interlacing mechanism 4, each weft yarn 5 can be fed to the working surface 41 of the interlacing mechanism 4 through the yarn guide groove 31 of the weft shuttle wheel 3 and interlaced with the warp yarns thereon.

[0032] In summary, the weft yarn 5 is guided and limited by the yarn guide groove 31 of the weft shuttle 3. When the circular loom is running normally, the weft yarn 5 pulled out from the weft yarn cylinder 1 is movably connected to the yarn guide groove 31 and then sent to the interlacing mechanism 4 through the yarn guide groove 31. At this time, the wheel surface of the weft shuttle 3 is in close contact with the working surface 41 of the interlacing mechanism 4 to ensure that the yarn can interlac with the warp yarn on the interlacing mechanism 4 smoothly. This can prevent the abnormal phenomenon of weft yarn 5 entanglement and thus ensure that the circular loom can produce continuously without stopping.

[0033] In another preferred embodiment, such as Figure 2 As shown, the diameter of each weft shuttle 3 is 50mm to 100mm, and its groove depth H is 1mm to 8mm, in order to limit the jump displacement of the weft yarn 5.

[0034] Further preferred, such as Figure 2 As shown, the groove width W of each yarn guide groove 31 is 1mm to 3mm to accommodate weft yarns 5 of various materials, specifications and strengths, such as weft yarns 5 composed of polyester yarn, nylon yarn or cotton yarn.

[0035] Further preferably, the surface roughness of the inner wall of each yarn guide groove 31 is ≤0.2μm to ensure that the inner wall surface of the yarn guide groove 31 is smooth. Therefore, the friction coefficient can be significantly reduced, and the difference in yarn feeding resistance caused by weft yarns 5 with different tensions can be solved, while achieving dynamic accuracy compensation.

[0036] Further preferably, the outer wall of each weft shuttle 3 is a smooth surface to ensure that the slope of the weft shuttle 3 is smooth, thus avoiding yarn rubbing.

[0037] In this specific embodiment, the groove depth H of the yarn guide groove 31 is 3mm, and its groove width W is 2mm. This allows for geometric groove constraints, limiting and guiding the weft yarn 5. In multi-warp, variable-tension weaving scenarios on circular looms, the geometric groove can forcibly constrain the weft yarn's trajectory, preventing weft yarn drift due to warp tension fluctuations or yarn specification changes (changes caused by thickness, material, etc.). This ensures the weft yarn 5 is conveyed along a preset path, solving the problem of disordered arrangement in traditional planar yarn feeding.

[0038] When the aforementioned geometric groove structure comes into contact with the yarn, it forms a local tension adjustment zone. That is, during the sliding process of the weft yarn 5 within the yarn guide groove 31, the contact pressure distribution between the groove wall and the yarn can finely adjust the yarn tension, thereby achieving tension pre-homogenization of the weft yarn 5 before it enters the weaving process, and thus reducing the compression deformation of the warp yarn caused by sudden changes in weft yarn tension. This is especially suitable for weaving scenarios such as multi-ply yarns and variable cross-section yarns.

[0039] When the warp tension changes abruptly, accurate weft feeding depends on the compatibility between the diameter of the weft shuttle wheel 3 and the groove depth H of the yarn guide groove 31 and the weft yarn specifications (such as thickness and width), that is, different specifications of circular looms correspond to different diameters of weft shuttle wheels 3.

[0040] When the weft shuttle 3 is making a circular motion, it feeds the weft yarn 5 into the root of the warp yarn layering area of ​​the interlacing mechanism 4 through the outermost yarn guide groove 31. The closer the outermost edge of the weft shuttle 3 is to the root of the warp yarn layering area, the more precise the interlacing point of the weft yarn is, and the more consistent the weft yarn spacing of the fabric. However, the diameter of the weft shuttle 3 is limited by the position of the disc opening. Therefore, the size of the weft shuttle 3 must ensure that it can feed the weft yarn along the root of the upper and lower warp yarn layers, while avoiding scratching it with the disc opening and other accessories, which would affect normal weaving.

[0041] In addition, compared with the prior art, the weft insertion structure of this embodiment has advantages such as low yarn winding failure rate, high product qualification rate, low weft yarn arrangement neatness error, wide applicable warp tension range and long service life, as shown in Table 1.

[0042] Table 1:

[0043] Yarn winding failure rate 30 times / km ≤2 times / km Product qualification rate 70％ 96％ Weft yarn alignment error ±3.00mm ±0.45mm Simultaneously weaving the number of raw material varieties Single raw material Compatible with multiple raw materials Service life 2600 hours 7500 hours

[0044] Example 2

[0045] like Figure 3 and Figure 4 As shown, Embodiment 2 provides a circular loom, including a size ring 6, a heald bar mechanism 7, a yarn feed bar 8 for straightening the warp yarns, and the weft insertion structure of Embodiment 1.

[0046] Size ring 6 includes an inner ring and an outer ring spaced apart, and is positioned above the weaving mechanism 4 to allow the woven fabric to pass through the gap between the inner and outer rings.

[0047] The heald bar mechanism 7 includes an inner heald bar row and an outer heald bar row. Both the inner and outer heald bar rows include 20 heald bars and form a yarn feeding hole for threading the yarn. During operation, the two rows of heald bars move up and down, and the weft shuttle 3 passes through when the two rows of warp yarns move up and down to form the maximum gap.

[0048] The yarn feed lever 8 straightens the warp yarns to ensure they have a certain tension, thus preventing some warp yarns from becoming loose and getting caught and tangled by the weft shuttle 3 when they sink.

[0049] Specifically, the warp yarns pass sequentially through the yarn feed bar 8 and the heald bar mechanism 7, and are woven into a fabric with the weft yarns in the interlacing mechanism 4. The fabric is then lifted and conveyed to the fabric storage mechanism by the size ring 6. When the warp yarns pass through the heald bar mechanism 7, they move in the opposite direction to the two adjacent heald bars. That is, when the heald bars move upward, the two adjacent heald bars carry the warp yarns downward, causing the adjacent warp yarns in the interlacing mechanism 4 to separate at a certain angle and form a channel space. The weft shuttle 3 runs through this space, and the outer periphery of the weft shuttle 3 abuts against the warp yarn intersection vertex of the interlacing mechanism 4. The weft yarn is conveyed to the warp yarn intersection vertex of the interlacing mechanism 4 through the yarn guide groove 31 set on the outer periphery of the weft shuttle 3, so that the weft yarn and warp yarn are interlaced at the highest vertex position. This avoids the situation where the warp yarn cannot accurately deliver the weft yarn (especially when the weft yarn is a webbing material with the same width and pitch) to the interlacing point, causing subsequent weft shuttle 3 to be blocked and the yarn to become entangled.

[0050] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A weft insertion structure for a circular weaving machine comprising an interlacing mechanism for providing warp yarns, characterised in that: It also includes a fixed bracket and a weft shuttle and a weft yarn cylinder assembled on the fixed bracket; The weft shuttles are arranged in a ring around the interlacing mechanism and are in close contact with each other; the outer circumferential surface of the weft shuttles has a yarn guide groove for guiding and limiting the weft yarn; The weft shuttle can rotate around the interlacing mechanism. The weft yarn drawn out from the weft yarn bobbin is movably connected to the yarn guide groove and is sent to the interlacing mechanism through the yarn guide groove, where it interlaces with the warp yarn on the interlacing mechanism.

2. The weft insertion structure of a circular weaving machine according to claim 1, characterized in that: The depth of the yarn guide groove is 1mm to 8mm.

3. Weft insertion structure for a circular weaving machine according to claim 2, characterized in that: The width of the yarn guide groove is 1mm to 3mm.

4. The weft insertion structure of a circular weaving machine according to claim 1, characterized in that: The surface roughness of the groove wall of the yarn guide groove is ≤0.2μm.

5. The weft insertion structure of a circular weaving machine according to claim 1, characterized in that: The cross-sectional shape of the yarn guide groove is U-shaped.

6. Weft insertion structure for a circular weaving machine according to any one of claims 1 to 5, characterized in that: The shuttle is a rigid shuttle.

7. The weft insertion structure of the circular loom according to claim 6, characterized in that: The rigid shuttle is a metal shuttle.

8. Weft insertion structure for a circular weaving machine according to any one of claims 1 to 5, characterized in that: The weft shuttle is circular.

9. Weft insertion structure for a circular weaving machine according to claim 8, characterized in that: The outer wall of the weft shuttle is a smooth surface.

10. A circular weaving machine, characterized in that: It includes at least the weft insertion structure of the circular loom as described in any one of claims 1-9.

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