A method and device for producing a kink-free coated wire

Abstract

The application discloses a preparation method and device of a non-kinked covered wire and relates to the technical field of textiles. The first hollow spindle is used for rotating and unwinding the core yarn upwards, so that the core yarn is twisted in real time under the rotation of the first spindle tube and directly enters the hollow pipe of the second hollow spindle through the tension assembly. The second hollow spindle is used for rotating and unwinding the outer wrapping yarn upwards, and the rotation direction of the first spindle tube is opposite to that of the second spindle tube. The core yarn and the outer wrapping yarn are combined on the upper meeting guide hook and then the outer wrapping yarn is wrapped on the surface of the core yarn to form the non-kinked covered wire. The twist degree of the real-time twisting of the core yarn is matched with the wrapping twist degree of the outer wrapping yarn, the real-time twisting of the core yarn and the wrapping of the outer wrapping yarn are realized in the preparation process of the covered wire, the twist directions of the twisting of the core yarn and the wrapping of the outer wrapping yarn are opposite, the counter-twist torque generated by the re-twisting of the core yarn offsets the counter-twist torque generated by the wrapping of the outer wrapping yarn, and the torque balance in the covered wire is realized.

Description

Technical Field

[0001] This invention relates to the field of textile technology, and in particular to a method and apparatus for preparing knot-free coated yarn. Background Technology

[0002] Twisting is a process that involves rotating the yarn around its own axis, causing the fibers within the yarn to bend, elongate, and twist, thus generating centripetal pressure. This strengthens the interaction between the fibers and makes them more tightly bound, thereby giving the yarn a certain degree of strength and elasticity. Examples of twisting include staple fiber yarns and filament yarns. Similarly, plied yarns composed of two or more single yarns can be twisted together to form a single unit.

[0003] Twisting causes the fibers in the yarn to bend, stretch, and twist, thus generating internal stress within the yarn. This internal stress causes the yarn to tend to untwist: if one end of the twisted yarn is released, the yarn will rotate in the opposite direction of the twisting direction under the influence of the counter-twisting torque generated by the internal stress, i.e., untwisting. Due to the presence of the counter-twisting torque in the yarn, the twisted yarn is an unstable structure. If the yarn with a certain counter-twisting torque does not form a free end, when it is under tension, the tension will keep the vector of the counter-twisting torque acting along the yarn axis. The counter-twisting torque will only adjust along the yarn axis with changes in tension and will not destroy the shape and structure of the yarn. Once the yarn tension is insufficient to keep the yarn straight, the vector of the counter-twisting torque deviates from the yarn axis. At the weak loop of the yarn with greater bending deformation, the residual torque on both sides of the yarn segment will have a coupling effect and twist the two sides of the yarn segment together. A schematic diagram of the twisted state of the yarn is shown below. Figure 1 As shown.

[0004] The magnitude of yarn anti-twist torque can be tested using the closed-loop method and expressed as the "twist index": This involves folding a unit length of yarn in half; under the influence of residual torque, the yarn undergoes self-twist. The number of self-twist loops per unit length of yarn, i.e., the "twist index," represents the magnitude of the anti-twist torque. For example, if a 500mm long yarn is held at both ends and folded in half to a length of 250mm, under the influence of anti-twist torque, the number of self-twist loops is 50, then the twist index is 200 twists / meter. The larger the twist index, the greater the yarn anti-twist torque, and the easier the yarn is to twist, especially under low or no tension.

[0005] The related technologies for preparing covered yarns often involve directly winding the outer wrapping yarn spirally onto the core yarn surface. When the outer wrapping yarn spirally winds onto the core yarn, it undergoes a certain degree of bending deformation, generating a counter-twisting torque similar to that of twisting yarns. That is, although covered yarns do not experience untwisting like twisted yarns, they still exhibit a counter-twisting torque due to the bending deformation of the outer wrapping yarn. Similarly, when the tension is insufficient to keep the yarn straight, self-twisting and knotting can occur. Clearly, when preparing fabrics using covered yarns with counter-twisting torque, the knotting of the yarn will inevitably lead to fabric texture distortion and deformation, affecting its aesthetics and user experience. For example, Figure 2 This is a schematic diagram of a fabric woven from covered yarns with a high twist index. Figure 3 A schematic diagram of a fabric woven from covered yarn with a low twist index, shown in the comparison. Figure 2 , Figure 3 It can be seen that when the twist index of the covering thread is relatively large, the warp of the fabric will be obviously skewed when it is placed naturally, and the fabric as a whole will have more wrinkles and undulations, which will have a significant negative impact on the subsequent processing of the fabric and the final fabric quality. Summary of the Invention

[0006] To address the aforementioned problems in related technologies, this invention provides a device for preparing knot-free coated yarn. Through innovative design of the device structure, real-time twisting of the core yarn and wrapping with the outer wrapping yarn are achieved during the preparation of the coated yarn. By configuring the twisting directions of the core yarn twisting and the outer wrapping yarn wrapping in opposite directions, the anti-twist torque generated by the re-twisting of the core yarn is used to counteract the anti-twist torque generated by the wrapping of the outer wrapping yarn, thereby achieving torque balance inside the coated yarn and preparing knot-free coated yarn.

[0007] According to a first aspect of the present invention, an apparatus for preparing a knot-free coated yarn is provided, characterized in that the apparatus includes a first hollow spindle mechanism, the first hollow spindle mechanism includes a first hollow spindle, the first hollow spindle is fixed with a first spindle tube by a spindle cap, the first spindle tube rotates synchronously with the first hollow spindle, and a core yarn is wound on the surface of the first spindle tube. A tension assembly and a second hollow spindle mechanism are sequentially arranged above the first hollow spindle mechanism. The second hollow spindle mechanism includes a second hollow spindle. The second hollow spindle is fixed with a second spindle tube by a spindle cap. The second spindle tube rotates synchronously with the second hollow spindle, and the rotation direction of the first spindle tube is opposite to the rotation direction of the second spindle tube. The surface of the second spindle tube is wound with an outer wrapping yarn. The core yarn unwound from the first spindle tube is twisted in real time under the rotation of the first spindle tube, and after the tension is adjusted by the tension component, it enters the hollow tube inlet of the second hollow spindle, and is then led out from the hollow tube outlet of the second hollow spindle. It is combined with the outer wrapping yarn unwound from the surface of the second spindle tube and then meets the yarn guide hook above. The outer wrapping yarn wraps around the surface of the core yarn to form a knot-free covered yarn. The real-time twist of the core yarn matches the wrapping twist of the outer wrapping yarn. Above the meeting yarn guide hook, there are sequentially arranged a yarn guide roller, a yarn guide rod, a traverse yarn guide, a winding roller, and a yarn tube. The knot-free covered yarn is led out upward by the yarn guide roller, then guided by the yarn guide rod and the traverse yarn guide, and then wound onto the surface of the yarn tube by the winding roller.

[0008] Preferably, the preparation device further includes a core yarn guide ring and an outer wrapping yarn guide ring; The core yarn guide ring is located between the tension component and the second hollow spindle. After the core yarn is output from the tension component, it enters the hollow tube of the second hollow spindle through the core yarn guide ring. The core yarn guide ring is located at one end of the horizontally arranged first telescopic rod. The core yarn guide ring adjusts the output path of the core yarn to coincide with the center line of the hollow tube of the second hollow spindle by controlling the extension and retraction state of the first telescopic rod. The outer wrapping yarn guide ring is fixedly connected to one side of the upper surface of the second spindle tube via a longitudinally arranged second telescopic rod, and the outer wrapping yarn guide ring rotates synchronously with the second spindle tube. After the outer wrapping yarn is unwound and output from the second spindle tube, it enters the meeting yarn guide hook through the outer wrapping yarn guide ring. The outer wrapping yarn guide ring adjusts the outer wrapping yarn to spirally wrap around the core yarn surface at a preset angle by controlling the extension and retraction state of the second telescopic rod.

[0009] Preferably, the preparation apparatus further includes an identification component; The identification component includes a first camera that matches the position of the first spindle tube and a second camera that matches the position of the second spindle tube; The first hollow ingot is connected to the first power mechanism via a transmission connection, and the second hollow ingot is connected to the second power mechanism via a transmission connection. The first camera and the first power mechanism are respectively electrically connected to the control console, and the second camera and the second power mechanism are respectively electrically connected to the control console; The first camera is used to capture an image of the core yarn on the surface of the first spindle tube and send it to the control console; the second camera is used to capture an image of the outer wrapping yarn on the surface of the second spindle tube and send it to the control console; the control console is used to determine the core yarn material corresponding to the core yarn based on the core yarn image, determine the outer wrapping yarn material corresponding to the outer wrapping yarn based on the outer wrapping yarn image, and then adjust the rotation state of the first power mechanism and the second power mechanism respectively according to the preset twisting relationship corresponding to the core yarn material and the outer wrapping yarn material, so that the real-time twisting twist of the core yarn matches the wrapping twist of the outer wrapping yarn and cancels out the mutual anti-twist torque.

[0010] Preferably, the control console directly identifies the yarn material corresponding to the core yarn and the outer wrapping yarn based on the core yarn image and the outer wrapping yarn image; or, A yarn label corresponding to the core yarn is fixed at a preset position on the first spindle tube, and a yarn label corresponding to the outer wrapping yarn is fixed at a preset position on the second spindle tube. The control console determines the yarn material corresponding to the core yarn and the outer wrapping yarn based on the yarn labels included in the core yarn image and the outer wrapping yarn image.

[0011] Preferably, the preset twisting relationship includes the real-time twisting degree and wrapping twisting degree relationship corresponding to the preparation of the covered yarn without twist when different core yarn materials and different outer wrapping yarn materials are used.

[0012] According to a second aspect of the present invention, a method for preparing a kink-free coated yarn is provided, characterized in that the preparation method includes: S10: After the first spindle tube with the core yarn wound is fixed to the first hollow spindle by the spindle cap, the core yarn is output upward by the rotation of the first hollow spindle, so that the core yarn is twisted in real time under the rotation of the first spindle tube, and after the tension is adjusted by the tension component, it enters the inlet of the hollow pipe of the second hollow spindle, and is then led out from the outlet of the hollow pipe of the second hollow spindle. S20: After fixing the second spindle tube with the outer wrapping yarn to the second hollow spindle through the spindle cap, the outer wrapping yarn is output upward by the rotation of the second hollow spindle. The rotation direction of the first spindle tube is opposite to the rotation direction of the second spindle tube. S30: The core yarn leading out of the hollow pipe outlet and the outer wrapping yarn unwound from the surface of the second spindle tube are combined at the upper meeting guide hook, and the outer wrapping yarn is wrapped around the surface of the core yarn to form a knot-free covered yarn. The real-time twist of the core yarn is matched with the wrapping twist of the outer wrapping yarn. S40: The knot-free covered yarn is drawn upwards by the yarn guide roller, then guided by the yarn guide rod and the transverse yarn guide, and finally wound onto the surface of the yarn tube by the winding roller.

[0013] Preferably, after the tension of the core yarn in S10 is adjusted by the tension assembly, the preparation method further includes: By controlling the extension and retraction state of the first telescopic rod connected to the core yarn guide ring, the output path of the core yarn is adjusted to coincide with the center line of the hollow pipe of the second hollow spindle; the core yarn guide ring is located between the tension component and the second hollow spindle, and after the core yarn is output from the tension component, it enters the hollow pipe of the second hollow spindle through the core yarn guide ring; the core yarn guide ring is located at one end of the first telescopic rod arranged laterally. After the second hollow spindle rotates and unwinds to output the outer wrapped yarn upwards in S20, the preparation method further includes: By controlling the extension and retraction state of the second telescopic rod connected to the outer wrapping yarn guide ring, the outer wrapping yarn is adjusted to spirally wrap around the core yarn surface at a preset angle; the outer wrapping yarn guide ring is fixedly connected to one side of the upper surface of the second spindle tube through the longitudinally arranged second telescopic rod, and the outer wrapping yarn guide ring rotates synchronously with the second spindle tube. After the outer wrapping yarn is unwound and output from the second spindle tube, it enters the meeting yarn guide hook through the outer wrapping yarn guide ring.

[0014] Preferably, when the first spindle tube wound with the core yarn is fixed to the first hollow spindle by a spindle cap, and the second spindle tube wound with the outer wrapping yarn is fixed to the second hollow spindle by a spindle cap, the preparation method further includes: The image of the core yarn on the surface of the first spindle tube is captured by a first camera that matches the position of the first spindle tube and sent to the control console; The image of the outer wrapping yarn on the surface of the second spindle tube is captured by a second camera that matches the position of the second spindle tube and sent to the control console; The control console determines the core yarn material corresponding to the core yarn based on the core yarn image, and determines the outer wrapping yarn material corresponding to the outer wrapping yarn based on the outer wrapping yarn image. Then, based on the preset twisting relationship corresponding to the core yarn material and the outer wrapping yarn material, the rotation states of the first power mechanism and the second power mechanism are adjusted respectively, so that the real-time twist of the core yarn matches the wrapping twist of the outer wrapping yarn to cancel out the mutual anti-twist torque. The first hollow spindle is driven by the first power mechanism, and the second hollow spindle is driven by the second power mechanism.

[0015] Preferably, the control console directly identifies the yarn material corresponding to the core yarn and the outer wrapping yarn based on the core yarn image and the outer wrapping yarn image; or, A yarn label corresponding to the core yarn is fixed at a preset position on the first spindle tube, and a yarn label corresponding to the outer wrapping yarn is fixed at a preset position on the second spindle tube. The control console determines the yarn material corresponding to the core yarn and the outer wrapping yarn based on the yarn labels included in the core yarn image and the outer wrapping yarn image.

[0016] Preferably, the preset twisting relationship includes the real-time twisting degree and wrapping twisting degree relationship corresponding to the preparation of the covered yarn without twist when different core yarn materials and different outer wrapping yarn materials are used.

[0017] Compared with the prior art, the method and apparatus for preparing a knot-free coated yarn provided by the present invention have the following advantages: The present invention provides a method and apparatus for preparing knot-free coated yarn. The core yarn is unwound and output upwards from a first hollow spindle, causing it to be twisted in real time under the rotation of the first spindle tube. After tension adjustment by a tension assembly, the core yarn directly enters the hollow tube inlet of a second hollow spindle and is then led out from the hollow tube outlet of the second hollow spindle. The outer wrapping yarn is then unwound and output upwards from the second hollow spindle, with the rotation direction of the first spindle tube opposite to that of the second spindle tube. The core yarn led out from the hollow tube outlet is unwound from the surface of the second spindle tube. After the outer wrapping yarn is combined with the upper meeting yarn guide hook, the outer wrapping yarn wraps around the surface of the core yarn to form a knot-free covered yarn. The real-time twist of the core yarn matches the wrapping twist of the outer wrapping yarn, thereby realizing the real-time twisting of the core yarn and the wrapping of the outer wrapping yarn during the preparation of the covered yarn. By configuring the twisting directions of the core yarn twisting and the wrapping of the outer wrapping yarn in opposite directions, the anti-twist torque generated by the re-twisting of the core yarn cancels out the anti-twist torque generated by the wrapping of the outer wrapping yarn, thus achieving torque balance inside the covered yarn and preparing a knot-free covered yarn. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the kinking state of a yarn provided in an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of a fabric woven from covered yarn with a high twist index, provided by related technologies.

[0021] Figure 3 This is a schematic diagram of a fabric woven from covered yarn with a low twist index, provided by related technologies.

[0022] Figure 4This is a schematic diagram of an apparatus for preparing a knot-free coated wire according to an embodiment of the present invention.

[0023] Figure 5 This is a schematic diagram of another apparatus for preparing a knot-free coated wire provided in an embodiment of the present invention.

[0024] Figure 6 This is a schematic diagram of another apparatus for preparing a knot-free coated wire provided in an embodiment of the present invention.

[0025] Figure 7 This is a flowchart of a method for preparing a knot-free coated wire according to an embodiment of the present invention.

[0026] Figure 8 This is a schematic diagram of the shape of a 500mm long yarn sample of the covered yarn spun by the five spinning schemes provided in the embodiments of the present invention after being folded and twisted. Detailed Implementation

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 4 This is a schematic diagram of an apparatus for preparing a kink-free coated wire according to an embodiment of the present invention. Figure 4 In the process, the preparation device includes a first hollow spindle mechanism, which includes a first hollow spindle 1. The first hollow spindle 1 is fixed with a first spindle tube 2 by a spindle cap. The first spindle tube 2 rotates synchronously with the first hollow spindle 1. Core yarn 3 is wound on the surface of the first spindle tube 2. The first hollow spindle mechanism is provided with a tension component 4 and a second hollow spindle mechanism in sequence above it. The second hollow spindle mechanism includes a second hollow spindle 5. The second hollow spindle 5 is fixed with a second spindle tube 6 by a spindle cap. The second spindle tube 6 rotates synchronously with the second hollow spindle 5, and the rotation direction of the first spindle tube 2 is opposite to the rotation direction of the second spindle tube 6. The surface of the second spindle tube 6 is wound with an outer wrapping yarn 7. The core yarn 3 unwound from the first spindle tube 2 is twisted in real time under the rotation of the first spindle tube 2, and after the tension is adjusted by the tension component 4, it enters the hollow pipe inlet of the second hollow spindle 5, and is then led out from the hollow pipe outlet of the second hollow spindle 5. It is then combined with the outer wrapping yarn 7 unwound from the surface of the second spindle tube 6 and meets the yarn guide hook 8 above. The outer wrapping yarn 7 wraps around the surface of the core yarn 3 to form a knot-free covered yarn. The real-time twist of the core yarn 3 matches the wrapping twist of the outer wrapping yarn 7. Above the meeting yarn guide hook 8, there are sequentially arranged a yarn guide roller 9, a yarn guide rod 10, a transverse yarn guide 11, a winding roller 12, and a yarn tube 13. The knot-free covered yarn is led out upward by the yarn guide roller 9, and then guided by the yarn guide rod 10 and the transverse yarn guide 11, and then wound around the surface of the yarn tube 13 by the winding roller 12.

[0029] It should be noted that in the existing fabrication process of coated yarn, the outside of the hollow spindle is usually used to install and fix the spindle tube with the outer wrapping yarn wound on it, while the hollow tube inside the hollow spindle is used to contain the core yarn. When the hollow spindle is in a rotating state, the core yarn in the inner hollow tube only moves upward or downward. The outer wrapping yarn unwound from the spindle tube directly wraps around the surface of the core yarn in a spiral shape when it meets the core yarn.

[0030] The device for preparing knot-free coated yarn provided by the present invention directly utilizes the spindle tube outside the first hollow spindle to wind the core yarn. Through its own rotation, the core yarn not only undergoes a simple conveying motion during the unwinding process, but also achieves its own real-time twisting motion. After the twisted core yarn is conveyed to the hollow tube of the second hollow spindle, it is combined with the outer wrapping yarn output from the surface of the second spindle tube. The outer wrapping yarn wraps around the surface of the core yarn to form a knot-free coated yarn.

[0031] In this process, the first hollow spindle rotates one revolution, which means that the core yarn unwound and output from the first spindle tube is twisted once.

[0032] Preferably, the preparation device further includes a core yarn guide ring 14 and an outer wrapping yarn guide ring 15. In this case, a schematic diagram of the preparation device for the knot-free coated yarn provided by the present invention is shown below. Figure 5 As shown.

[0033] The core yarn guide ring 14 is located between the tension component 4 and the second hollow spindle 5. After the core yarn 3 is output from the tension component 4, it enters the hollow tube of the second hollow spindle 5 through the core yarn guide ring 14. The core yarn guide ring 14 is located at one end of the horizontally arranged first telescopic rod 16. The core yarn guide ring 14 adjusts the output path of the core yarn 3 to coincide with the center line of the hollow tube of the second hollow spindle 5 by controlling the extension and retraction state of the first telescopic rod 16. The outer wrapping yarn guide ring 15 is fixedly connected to one side of the upper surface of the second spindle tube 6 via a longitudinally arranged second telescopic rod 17, and the outer wrapping yarn guide ring 15 rotates synchronously with the second spindle tube 6. After the outer wrapping yarn 7 is unwound and output from the second spindle tube 6, it enters the meeting yarn guide hook 8 through the outer wrapping yarn guide ring 15. The outer wrapping yarn guide ring 15 adjusts the outer wrapping yarn 7 to spirally wrap around the surface of the core yarn 3 at a preset angle by controlling the extension and retraction state of the second telescopic rod 17.

[0034] For core yarns of different specifications, it is difficult to ensure that the output path of the core yarn after the tension assembly outputs the core yarn coincides with the center line of the hollow tube of the second hollow spindle. This affects the wrapping angle of the subsequent outer wrapping yarn on the core yarn, causing the wrapping twist of the outer wrapping yarn in the covering yarn to fail to meet the expected standard and affecting the balance of its internal anti-twist torque. The present invention adjusts the corresponding position of the core yarn guide ring and the second hollow spindle by controlling the extension and retraction state of the first telescopic rod, so that the output path of the core yarn coincides stably with the center line of the hollow tube of the second hollow spindle.

[0035] Furthermore, when the outer wrapping yarn is unwound from the second spindle tube and directly wrapped around the core yarn surface, as the outer wrapping yarn continues to unwound from the second spindle tube, the winding diameter of the outer wrapping yarn on the second spindle tube continues to shorten, causing the wrapping angle of the outer wrapping yarn on the core yarn surface to gradually decrease. Similarly, the wrapping twist of the outer wrapping yarn in the covering thread cannot meet the expected standard, thus affecting the balance of its internal anti-twist torque. The present invention also adopts a setting where the outer wrapping yarn guide ring is fixedly connected to one side of the upper surface of the second spindle tube through a longitudinally arranged second telescopic rod, so that the outer wrapping yarn, after being unwound from the second spindle tube, is wrapped around the core yarn surface at a fixed wrapping angle by the guiding action of the outer wrapping yarn guide ring.

[0036] By setting the core yarn guide ring and the outer wrapping yarn guide ring, the present invention can ensure the wrapping quality of the covering yarn and avoid the anti-twist torque generated by the outer wrapping yarn being unable to balance the anti-twist torque generated by the core yarn self-twist due to low wrapping quality.

[0037] Furthermore, the size of the core yarn guide ring and the outer wrapping yarn guide ring can also be adjusted according to the diameter of the core yarn and the outer wrapping yarn, so that each guide ring matches the corresponding yarn diameter, thereby stabilizing the conveying path of the core yarn and the outer wrapping yarn before wrapping.

[0038] Preferably, the preparation apparatus further includes an identification component. In this case, a schematic diagram of the preparation apparatus for the knot-free coated wire provided by the present invention is shown below. Figure 6 As shown: The identification component includes a first camera 18 that matches the position of the first spindle tube 2 and a second camera 19 that matches the position of the second spindle tube 6. The first hollow ingot 1 is connected to the first power mechanism 20 via a transmission connection, and the second hollow ingot 5 is connected to the second power mechanism 21 via a transmission connection. The first camera 18 and the first power mechanism 20 are respectively electrically connected to the control console 22, and the second camera 19 and the second power mechanism 21 are respectively electrically connected to the control console 22. The first camera 18 is used to capture an image of the core yarn on the surface of the first spindle tube 2 and send it to the control console 22; the second camera 19 is used to capture an image of the outer wrapping yarn on the surface of the second spindle tube 6 and send it to the control console 22; the control console 22 is used to determine the core yarn material corresponding to the core yarn 3 based on the core yarn image, and to determine the outer wrapping yarn material corresponding to the outer wrapping yarn 7 based on the outer wrapping yarn image, and then adjust the rotation state of the first power mechanism 20 and the second power mechanism 21 respectively according to the preset twisting relationship corresponding to the core yarn material and the outer wrapping yarn material, so that the real-time twisting twist of the core yarn 3 matches the wrapping twist of the outer wrapping yarn 7 and cancels the mutual anti-twist torque.

[0039] In one feasible implementation, the first and second power mechanisms can be drive motors, and the transmission connection between the first and second power mechanisms and the first and second spindle tubes can be via a belt drive. Since the first and second hollow spindles are driven by different power mechanisms, the control console can adjust the rotational speeds of the first and second hollow spindles separately using the first and second power mechanisms: adjusting the rotational speed of the first hollow spindle changes the twist of the core yarn itself; the core yarn twist (twist / meter) = first hollow spindle rotational speed (rpm) / yarn guide roller output linear speed (m / min); adjusting the rotational speed of the second hollow spindle changes the wrapping twist of the outer wrapping yarn; the wrapping twist (twist / meter) = second hollow spindle rotational speed (rpm) / yarn guide roller output linear speed (m / min).

[0040] This invention, through the setting of the identification component, can identify and control the twist relationship between the core yarn and the wrapping yarn in real time. This can meet the stable production needs in scenarios where different yarn materials are frequently changed to prepare knot-free coated yarn, avoiding production accidents caused by human error in yarn replacement and operation. Furthermore, the production data of knot-free coated yarn preparation achieved by each yarn combination can be encrypted and stored on the control console, which can prevent the leakage of production data due to staff turnover. This achieves automated, continuous, and stable production of knot-free coated yarn while protecting the production data.

[0041] Preferably, the control console directly identifies the yarn material corresponding to the core yarn and the outer wrapping yarn based on the core yarn image and the outer wrapping yarn image; or, A yarn label corresponding to the core yarn is fixed at a preset position on the first spindle tube, and a yarn label corresponding to the outer wrapping yarn is fixed at a preset position on the second spindle tube. The control console determines the yarn material corresponding to the core yarn and the outer wrapping yarn based on the yarn labels included in the core yarn image and the outer wrapping yarn image.

[0042] It should be noted that a corresponding yarn recognition neural network model can be established, and the model can be trained by feeding in a large number of yarn images and corresponding yarn material labels. The control console can directly identify the yarn material corresponding to the core yarn and the outer wrapping yarn based on the core yarn image and the outer wrapping yarn image through the trained yarn recognition neural network model. Specifically, the control console identifies the image captured by the first camera as the core yarn image and the image captured by the second camera as the outer wrapping yarn image.

[0043] Yarn labels are labels that are pre-set on the spindle tube by the staff according to the type of yarn wound on the spindle tube. The label can be a symbol with identification function such as text, image, number, QR code, etc. The control console can pre-store the correspondence between each yarn label and the yarn material.

[0044] Preferably, the preset twisting relationship includes the real-time twisting degree and wrapping twisting degree relationship corresponding to the preparation of the covered yarn without twist when different core yarn materials and different outer wrapping yarn materials are used.

[0045] Since the core yarn and outer wrapping yarn have different specifications and different wrapping yarn twists, the core yarn twist required to achieve "twist-free" covered yarn also varies. Therefore, given the types of outer wrapping yarn and core yarn, as well as the wrapping yarn twist, the core yarn twist can be determined experimentally. That is, core yarns with different twists are twisted, and the twist index of the covered yarn under different core yarn twists is tested. For example, when the twist index of the covered yarn reaches ≤10 twists / meter, the core yarn twist at this time can be used as the core yarn twist for matching the given conditions.

[0046] Staff can conduct numerous experiments to obtain the real-time twisting and wrapping twisting relationships corresponding to different core yarn materials and different outer wrapping yarn materials when preparing twisted yarns. These relationships are then added to the preset twisting relationships and stored in the control console.

[0047] Preferably, when the core yarn is a short fiber core yarn, the rotation direction of the first spindle tube is the same as the original twisting direction of the core yarn.

[0048] Short fiber core yarn is a yarn spun from short fibers through twisting, such as cotton yarn, linen yarn, wool yarn, chemical short fiber yarn, and various short fiber blended yarns. When the core yarn is a short fiber core yarn, the real-time twisting direction of the core yarn must be the same as the original twist direction of the core yarn. For example, if the original twist of the core yarn is Z-twist, then the real-time twisting of the core yarn must also be Z-twist. If the original twist direction of the core yarn is S-twist, then the real-time twisting of the core yarn must also be S-twist. Otherwise, if the real-time twisting direction of the core yarn is opposite to the original twist direction, it is essentially untwisting the core yarn. The core yarn will also lose strength due to untwisting, leading to core yarn breakage.

[0049] It should be noted that the filament core yarn itself has good strength and will not break even if the original twist is untwisted. Therefore, this application does not limit the twist direction of the real-time twisting of the filament core yarn.

[0050] To better illustrate the technical effects of the apparatus for preparing kink-free coated yarn provided by the present invention, a flowchart of a method for preparing kink-free coated yarn is shown as follows: Figure 7 As shown, the method for preparing the kink-free coated yarn is applied to the aforementioned apparatus for preparing the kink-free coated yarn, and includes: S10: After the first spindle tube with the core yarn wound on it is fixed to the first hollow spindle by the spindle cap, the core yarn is output upward by the rotation of the first hollow spindle. The core yarn is twisted in real time under the rotation of the first spindle tube and enters the hollow tube inlet of the second hollow spindle through the tension component, and is then led out from the hollow tube outlet of the second hollow spindle.

[0051] S20: After the second spindle tube with the outer wrapping yarn is fixed to the second hollow spindle by the spindle cap, the outer wrapping yarn is output upward by the rotation of the second hollow spindle. The rotation direction of the first spindle tube is opposite to the rotation direction of the second spindle tube.

[0052] S30: The core yarn leading out of the hollow pipe outlet and the outer wrapping yarn unwound from the surface of the second spindle tube are combined at the upper meeting guide hook, and the outer wrapping yarn is wrapped around the surface of the core yarn to form a knot-free covered yarn. The real-time twist of the core yarn matches the wrapping twist of the outer wrapping yarn.

[0053] S40: The knot-free covered yarn is drawn upwards by the yarn guide roller, then guided by the yarn guide rod and the transverse yarn guide, and finally wound onto the surface of the yarn tube by the winding roller.

[0054] Preferably, after the tension of the core yarn in S10 is adjusted by the tension assembly, the preparation method further includes: By controlling the extension and retraction state of the first telescopic rod connected to the core yarn guide ring, the output path of the core yarn is adjusted to coincide with the center line of the hollow pipe of the second hollow spindle; the core yarn guide ring is located between the tension component and the second hollow spindle, and after the core yarn is output from the tension component, it enters the hollow pipe of the second hollow spindle through the core yarn guide ring; the core yarn guide ring is located at one end of the first telescopic rod arranged laterally. After the second hollow spindle rotates and unwinds to output the outer wrapped yarn upwards in S20, the preparation method further includes: By controlling the extension and retraction state of the second telescopic rod connected to the outer wrapping yarn guide ring, the outer wrapping yarn is adjusted to spirally wrap around the core yarn surface at a preset angle; the outer wrapping yarn guide ring is fixedly connected to one side of the upper surface of the second spindle tube through the longitudinally arranged second telescopic rod, and the outer wrapping yarn guide ring rotates synchronously with the second spindle tube. After the outer wrapping yarn is unwound and output from the second spindle tube, it enters the meeting yarn guide hook through the outer wrapping yarn guide ring.

[0055] Preferably, when the first spindle tube wound with the core yarn is fixed to the first hollow spindle by a spindle cap, and the second spindle tube wound with the outer wrapping yarn is fixed to the second hollow spindle by a spindle cap, the preparation method further includes: The image of the core yarn on the surface of the first spindle tube is captured by a first camera that matches the position of the first spindle tube and sent to the control console; The image of the outer wrapping yarn on the surface of the second spindle tube is captured by a second camera that matches the position of the second spindle tube and sent to the control console; The control console determines the core yarn material corresponding to the core yarn based on the core yarn image, and determines the outer wrapping yarn material corresponding to the outer wrapping yarn based on the outer wrapping yarn image. Then, based on the preset twisting relationship corresponding to the core yarn material and the outer wrapping yarn material, the rotation states of the first power mechanism and the second power mechanism are adjusted respectively, so that the real-time twist of the core yarn matches the wrapping twist of the outer wrapping yarn to cancel out the mutual anti-twist torque. The first hollow spindle is driven by the first power mechanism, and the second hollow spindle is driven by the second power mechanism.

[0056] Preferably, the control console directly identifies the yarn material corresponding to the core yarn and the outer wrapping yarn based on the core yarn image and the outer wrapping yarn image; or, A yarn label corresponding to the core yarn is fixed at a preset position on the first spindle tube, and a yarn label corresponding to the outer wrapping yarn is fixed at a preset position on the second spindle tube. The control console determines the yarn material corresponding to the core yarn and the outer wrapping yarn based on the yarn labels included in the core yarn image and the outer wrapping yarn image.

[0057] Preferably, the preset twisting relationship includes the real-time twisting degree and wrapping twisting degree relationship corresponding to the preparation of the covered yarn without twist when different core yarn materials and different outer wrapping yarn materials are used.

[0058] Preferably, when the core yarn is a short fiber core yarn, the rotation direction of the first spindle tube is the same as the original twisting direction of the core yarn.

[0059] Furthermore, to further illustrate the advantages of the method and apparatus for preparing kink-free coated yarn provided by the present invention, the following examples illustrate the preparation of single-layer coated yarn using the method and apparatus provided by the present invention: The core yarn used in this embodiment is 150D / 48F blue-gray polyester DTY (low elasticity yarn), and the outer wrapping yarn is 75D / 36F black polyester DTY. The wrapping twist is set to 500 twists / meter, the second hollow spindle speed is set to 12000 rpm, the yarn drawing speed is 24 m / min, the wrapping twist direction is Z twist, and the wrapping twist = second hollow spindle speed / yarn drawing speed.

[0060] The various spinning schemes corresponding to the embodiments are shown in Table 1, wherein the core yarn twisting twist = first hollow spindle rotation speed / yarn drawing speed; the twisting direction of the first hollow spindle is S twist.

[0061] 1 0 0 2 2400 100 3 4800 200 4 7200 300 5 9600 400 Table 1 The kink index of the covered yarn prepared by each spinning scheme was tested using the closed loop method: Take a 500 mm long covered yarn sample, hold both ends and fold it in half to prevent the yarn sample from rotating under the action of the anti-twisting torque. The yarn sample will then self-twist under the action of the anti-twisting torque. Count the number of self-twisting turns on the 250 mm long yarn after folding and calculate the kink index (twists / meter). The larger the number of self-twisting turns, that is, the larger the kink index, the easier the yarn is to kink.

[0062] Table 1 shows the morphology of a 500mm long covered yarn sample folded in half and self-twisted (250mm) after spinning according to the five spinning schemes. Figure 8 As shown, Figure 8 The five yarn samples, from left to right, correspond to the covered yarns prepared by spinning schemes 1-5, respectively. Through observation... Figure 8 It can be seen that when the core yarn is not reverse twisted (leftmost yarn sample), the yarn twisting phenomenon is serious; after the core yarn is reverse twisted, the twisting phenomenon of the covering yarn is reduced, and as the twisting degree of the core yarn increases, the twisting phenomenon becomes less and less.

[0063] Furthermore, the present invention tested the kink index of the covered yarn prepared by the spinning scheme shown in Table 1, and some of the test results are shown in Table 2, wherein the unit corresponding to each kink index is (twist / meter).

[0064] First test of kink index 142.0 116.4 52.0 31.2 14.0 The second test of the knot index 136.4 102.4 60.0 38.4 14.0 The third test of the kink index 139.6 140.0 49.6 30.8 6.0 The fourth test of the kink index 126.0 118.0 64.4 37.6 6.0 The fifth test of the kink index 139.2 135.6 70.8 37.6 14.0 The sixth test of the kink index 140.4 114.0 54.4 39.2 14.0 The 7th test of the kink index 146.4 108.4 67.6 27.6 10.0 The 8th test of the kink index 136.0 98.4 73.2 36.4 10.0 The 9th test of the kink index 147.2 111.2 66.8 52.0 6.0 The 10th test of the kink index 148.0 119.2 84.8 40.0 22.0 Mean kink index 140.1 116.4 64.36 37.08 11.6 Table 2 As shown in Table 2, the twist index of the covered yarn decreases as the twist of the core yarn increases. When the twist of the core yarn in the reverse direction is 400 twists / meter, the average twist index of the covered yarn decreases from 140.1 twists / meter to 11.6 twists / meter. Obviously, the method and apparatus for preparing the knot-free covered yarn provided by the present invention can effectively reduce the knotting phenomenon of the covered yarn.

[0065] Compared with the prior art, the method and apparatus for preparing a knot-free coated yarn provided by the present invention have the following advantages: The present invention provides a method and apparatus for preparing knot-free coated yarn. The core yarn is unwound and output upwards from a first hollow spindle, causing it to be twisted in real time under the rotation of the first spindle tube. After tension adjustment by a tension assembly, the core yarn directly enters the hollow tube inlet of a second hollow spindle and is then led out from the hollow tube outlet of the second hollow spindle. The outer wrapping yarn is then unwound and output upwards from the second hollow spindle, with the rotation direction of the first spindle tube opposite to that of the second spindle tube. The core yarn led out from the hollow tube outlet is unwound from the surface of the second spindle tube. After the outer wrapping yarn is combined with the upper meeting yarn guide hook, the outer wrapping yarn wraps around the surface of the core yarn to form a knot-free covered yarn. The real-time twist of the core yarn matches the wrapping twist of the outer wrapping yarn, thereby realizing the real-time twisting of the core yarn and the wrapping of the outer wrapping yarn during the preparation of the covered yarn. By configuring the twisting directions of the core yarn twisting and the wrapping of the outer wrapping yarn in opposite directions, the anti-twist torque generated by the re-twisting of the core yarn cancels out the anti-twist torque generated by the wrapping of the outer wrapping yarn, thus achieving torque balance inside the covered yarn and preparing a knot-free covered yarn.

[0066] Although the present invention has been described in detail above with general descriptions, specific embodiments, and experiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

[0067] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. It should be understood that the invention is not limited to the precise structures and methods described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope.

Claims

1. An apparatus for producing a kink-free coated wire, characterized by comprising: The preparation device includes a first hollow spindle mechanism, which includes a first hollow spindle. The first hollow spindle is fixed with a first spindle tube by a spindle cap. The first spindle tube rotates synchronously with the first hollow spindle, and core yarn is wound on the surface of the first spindle tube. A tension assembly and a second hollow spindle mechanism are sequentially arranged above the first hollow spindle mechanism. The second hollow spindle mechanism includes a second hollow spindle. The second hollow spindle is fixed with a second spindle tube by a spindle cap. The second spindle tube rotates synchronously with the second hollow spindle, and the rotation direction of the first spindle tube is opposite to the rotation direction of the second spindle tube. The surface of the second spindle tube is wound with an outer wrapping yarn. The preparation apparatus further includes an identification component; wherein the identification component includes a first camera matching the position of the first spindle tube and a second camera matching the position of the second spindle tube; the first hollow spindle is drivenly connected to a first power mechanism, and the second hollow spindle is drivenly connected to a second power mechanism; the first camera and the first power mechanism are respectively electrically connected to a control console, and the second camera and the second power mechanism are respectively electrically connected to the control console; the first camera is used to capture an image of the core yarn on the surface of the first spindle tube and send it to the control console; the second camera is used to capture an image of the outer wrapping yarn on the surface of the second spindle tube and send it to the control console; the control console is used to determine the core yarn material corresponding to the core yarn based on the core yarn image, determine the outer wrapping yarn material corresponding to the outer wrapping yarn based on the outer wrapping yarn image, and then divide the core yarn material and the outer wrapping yarn material according to a preset twisting relationship. The rotation states of the first and second power mechanisms are adjusted to match the real-time twist of the core yarn with the wrapping twist of the outer wrapping yarn, thus offsetting the mutual anti-twisting torque. A yarn label corresponding to the core yarn is fixed at a preset position on the first spindle tube, and a yarn label corresponding to the outer wrapping yarn is fixed at a preset position on the second spindle tube. The control console determines the yarn material corresponding to the core yarn and the outer wrapping yarn based on the yarn labels included in the core yarn image and the outer wrapping yarn image. The core yarn unwound from the first spindle tube is twisted in real time under the rotation of the first spindle tube, and after the tension is adjusted by the tension component, it enters the hollow pipe inlet of the second hollow spindle, and is then led out from the hollow pipe outlet of the second hollow spindle. It merges with the outer wrapping yarn unwound from the surface of the second spindle tube and meets at the upper yarn guide hook. The outer wrapping yarn then wraps around the surface of the core yarn to form a knot-free covered yarn. Above the meeting yarn guide hook, there are sequentially arranged a yarn guide roller, a yarn guide rod, a traverse yarn guide, a winding roller, and a yarn tube. The knot-free covered yarn is led out upward by the yarn guide roller, then guided by the yarn guide rod and the traverse yarn guide, and then wound onto the surface of the yarn tube by the winding roller.

2. The preparation device according to claim 1, characterized in that The preparation device further includes a core yarn guide ring and an outer wrapping yarn guide ring; The core yarn guide ring is located between the tension assembly and the second hollow spindle. After the core yarn is output from the tension assembly, it enters the hollow tube of the second hollow spindle through the core yarn guide ring. The core yarn guide ring is located at one end of the horizontally arranged first telescopic rod. The core yarn guide ring adjusts the output path of the core yarn to coincide with the center line of the hollow tube of the second hollow spindle by controlling the extension and retraction state of the first telescopic rod. The outer wrapping yarn guide ring is fixedly connected to one side of the upper surface of the second spindle tube via a longitudinally arranged second telescopic rod, and the outer wrapping yarn guide ring rotates synchronously with the second spindle tube. After the outer wrapping yarn is unwound and output from the second spindle tube, it enters the meeting yarn guide hook through the outer wrapping yarn guide ring. The outer wrapping yarn guide ring adjusts the outer wrapping yarn to spirally wrap around the core yarn surface at a preset angle by controlling the extension and retraction state of the second telescopic rod.

3. The preparation device according to claim 1, characterized in that The preset twisting relationship includes the real-time twisting degree and wrapping twist relationship corresponding to the preparation of the covered yarn without kinking when different core yarn materials and different outer wrapping yarn materials are used.

4. A method for preparing a kink-free coated yarn, using the apparatus for preparing a kink-free coated yarn as described in any one of claims 1 to 3, characterized in that, The preparation method includes: S10: After the first spindle tube with the core yarn wound is fixed to the first hollow spindle by the spindle cap, the core yarn is output upward by the rotation of the first hollow spindle, so that the core yarn is twisted in real time under the rotation of the first spindle tube, and after the tension is adjusted by the tension component, it enters the inlet of the hollow pipe of the second hollow spindle, and is then led out from the outlet of the hollow pipe of the second hollow spindle. S20: After fixing the second spindle tube with the outer wrapping yarn to the second hollow spindle through the spindle cap, the outer wrapping yarn is output upward by the rotation of the second hollow spindle. The rotation direction of the first spindle tube is opposite to the rotation direction of the second spindle tube. S30: The core yarn leading out of the hollow pipe outlet and the outer wrapping yarn unwound from the surface of the second spindle tube are combined at the upper meeting guide hook, and the outer wrapping yarn is wrapped around the surface of the core yarn to form a knotless covered yarn. S40: The knot-free covered yarn is led out upward by the yarn guide roller, then guided by the yarn guide rod and the transverse yarn guide, and then wound onto the surface of the yarn tube by the winding roller. When the first spindle tube wound with the core yarn is fixed to the first hollow spindle by a spindle cap, and the second spindle tube wound with the outer wrapping yarn is fixed to the second hollow spindle by a spindle cap, the preparation method further includes: A first camera, positioned to match the first spindle tube, captures an image of the core yarn on the surface of the first spindle tube and sends it to a control console. A second camera, positioned to match the second spindle tube, captures an image of the outer wrapping yarn on the surface of the second spindle tube and sends it to the control console. The control console determines the core yarn material corresponding to the core yarn based on the core yarn image and the outer wrapping yarn material corresponding to the outer wrapping yarn image. Then, based on the preset twisting relationship between the core yarn material and the outer wrapping yarn material, the rotation states of the first and second power mechanisms are adjusted respectively, so that the real-time twist of the core yarn matches the wrapping twist of the outer wrapping yarn, thus offsetting the mutual anti-twist torque. The first hollow spindle is driven by the first power mechanism, and the second hollow spindle is driven by the second power mechanism. A yarn label corresponding to the core yarn is fixed at a preset position on the first spindle tube, and a yarn label corresponding to the outer wrapping yarn is fixed at a preset position on the second spindle tube. The control console determines the yarn material corresponding to the core yarn and the outer wrapping yarn based on the yarn labels included in the core yarn image and the outer wrapping yarn image.

5. The preparation method according to claim 4, characterized in that, After the core yarn described in S10 has its tension adjusted by the tension assembly, the preparation method further includes: By controlling the extension and retraction state of the first telescopic rod connected to the core yarn guide ring, the output path of the core yarn is adjusted to coincide with the center line of the hollow pipe of the second hollow spindle; the core yarn guide ring is located between the tension component and the second hollow spindle, and after the core yarn is output from the tension component, it enters the hollow pipe of the second hollow spindle through the core yarn guide ring; the core yarn guide ring is located at one end of the first telescopic rod arranged laterally. After the second hollow spindle rotates and unwinds to output the outer wrapped yarn upwards in S20, the preparation method further includes: By controlling the extension and retraction state of the second telescopic rod connected to the outer wrapping yarn guide ring, the outer wrapping yarn is adjusted to spirally wrap around the core yarn surface at a preset angle; the outer wrapping yarn guide ring is fixedly connected to one side of the upper surface of the second spindle tube through the longitudinally arranged second telescopic rod, and the outer wrapping yarn guide ring rotates synchronously with the second spindle tube. After the outer wrapping yarn is unwound and output from the second spindle tube, it enters the meeting yarn guide hook through the outer wrapping yarn guide ring.

6. The preparation method according to claim 4, characterized in that, The preset twisting relationship includes the real-time twisting degree and wrapping twist relationship corresponding to the preparation of the covered yarn without kinking when different core yarn materials and different outer wrapping yarn materials are used.

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