Device and method for steadily covering spinning of wide slivers with special-shaped tube negative pressure grid ring fiber opening

Abstract

The present invention provides a device and method for the steady-state covering spinning of wide slivers using a special-shaped tube negative pressure grid ring. The device comprises a feeding unit, a core-wrapping unit, and a winding unit. The core-wrapping unit comprises a conveying component, a negative pressure covering component, and a yarn guide rod. The negative pressure covering component can spread the staple slivers in an open-fiber manner, forming wide slivers that are stably covered with a core yarn. The present invention provides a core-wrapping unit, coordinated with a core feeding mechanism and a staple drafting feeding mechanism, and utilizes a special-shaped tube negative pressure grid ring covering method to evenly cover the staple slivers with the outer layer of the core yarn after opening them. This produces a core-wrapped yarn with good covering effect and a large core yarn proportion. This maximizes the utilization of staple fibers, reduces the raw material cost of the core-wrapped yarn, and solves the problem of traditional ring-spun core-wrapped yarns prone to core exposure and a small core yarn proportion. Through the coordinated cooperation of the various units, the device is applied in industry to achieve industrial high-speed spinning, and the core-wrapped yarn produced has high comprehensive performance and a wide market application.

Description

Technical Field

[0001] The present invention relates to the field of textile technology, and in particular to a device and method for spinning a wide sliver with a fiber-opening type using a special-shaped tube negative pressure grid ring and steady-state covering. Background Art

[0002] Core-spun yarn, also known as composite yarn or covered yarn, is a type of yarn composed of two or more fibers. Staple-fiber core-spun yarn is popular because it combines the outer staple fibers with the core yarn, leveraging their respective strengths to optimize the yarn's structure and properties. In staple-fiber core-spun yarn, not only does the coverage of the staple fibers affect the core yarn's performance, but the core yarn's volume fraction also plays a significant role, making it a crucial performance metric.

[0003] Currently, core-spun yarns are produced using a variety of methods, including ring spinning, electrospinning, vortex spinning, and self-twist spinning. my country's cotton spinning industry primarily uses ring spinning to produce core-spun yarns. Ring-spun core-spun yarns are produced by adding a filament feeding device to a conventional ring spinning frame. This allows filaments to be fed from the center of the fiber sliver, where they are twisted by the rotating balloon, wrapping the staple fibers around the outer surface to form the core-spun yarn. However, the core-spun yarns produced using this method are prone to core leakage, and the core yarn content is generally less than 15%.

[0004] The invention patent (application number CN 202111337262.3) discloses a core-spun spinning device and a new structure core-spun spinning method with full coverage of a macro core. An auxiliary core-spun device is added between the front roller jaws and the yarn guide hook of an ordinary ring spinning frame. The auxiliary core-spun device includes a first yarn path for transmitting the outer material, a second yarn path for transmitting the core layer material, and a wrapping point for wrapping and merging; during the spinning process, the staple fiber whiskers and the filaments form a "y"-shaped twisting structure with the filaments in a straight state, and the filaments remain straight at the wrapping point. The staple fiber whiskers rely on the twist rotation of the filaments and part of their own twist to wrap around the outer layer of the filaments at the wrapping point to form a core-spun yarn with good wrapping effect, which solves the core exposure problem of ring-spun core-spun yarn. However, the core-spun spinning device and the core-spun spinning method have an additional auxiliary core-spun device, and the short fibers need to be fed into the second yarn channel in a broken line form and entangled with the filaments fed into the first yarn channel, which is difficult to apply to the high-speed ring spinning in actual factories. At the same time, in the high-speed spinning process of actual factories, the short fiber slivers are often gathered and gathered in the constraint channel due to the pulling effect of the spinning tension and the squeezing effect of the side walls of the constraint channel, resulting in a reduction in the wrapping area of ​​the slivers on the core filaments, thereby limiting the proportion of the core filaments (the proportion of the core filaments under excellent wrapping effect is less than 55%, and the core-spun ratio has encountered a bottleneck and is difficult to further improve), and reducing the wrapping tightness and coverage rate. In particular, during high-speed spinning, the short fibers are prone to accumulation and entanglement in the auxiliary core-spun device, resulting in machine failure, reduced production efficiency, and uneven structure and poor quality of the prepared core-spun yarn, and the core filament proportion of the core-spun yarn is difficult to further increase. In addition, when the short fiber slivers have working conditions such as broken ends in the auxiliary core-spun device, the device increases the difficulty of repair for workers.

[0005] In view of this, it is necessary to design an improved special-shaped tube negative pressure grid ring fiber-opening wide sliver steady-state covering spinning device and method to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a device and method for steady-state covering spinning of wide slivers with a special-shaped tube negative pressure grid ring fiber opening type. The device is provided with a core-wrapping unit, which cooperates with a core feeding mechanism and a staple fiber drafting and feeding mechanism to uniformly cover the wide slivers after fiber opening on the outer layer of the core wire, thereby obtaining a core-wrapped yarn with a good covering effect and a relatively large proportion of core wires, so as to maximize the utilization of staple fibers, reduce the raw material cost of the core-wrapped yarn, and solve the problem that the core-wrapped yarn prepared by traditional ring spinning is prone to core exposure and the core wire proportion encounters a bottleneck.

[0007] In order to achieve the above-mentioned purpose of the invention, the present invention provides a special-shaped tube negative pressure grid ring open fiber type wide fiber steady-state covering spinning device, comprising a feeding unit, a core-wrapping unit and a winding unit; the feeding unit comprises a core feeding mechanism for feeding core wire, a short fiber stretching and feeding mechanism for stretching the coarse yarn into short fiber strands and feeding them into the core-wrapping unit; the core-wrapping unit comprises a conveying component negative pressure covering component and a yarn guide rod for providing power for the core-wrapping unit; the negative pressure covering component opens and widens the short fiber strands to form wide strands, and the wide strands stably cover the core wire to obtain core-wrapped yarn, and a heating groove is provided on the yarn guide rod, and the temperature of the heating groove is 100-200°C. The yarn guide rod changes the transmission path of the yarn output from the core-wrapping unit through the heating groove, and conveys the yarn to the yarn winding unit.

[0008] As a further improvement of the present invention, the negative pressure covering component includes a special-shaped tube, a mesh ring covering the surface of the special-shaped tube, and a wrapping area where the wide fiber strips and the core wire intersect and wrap; the mesh ring only allows airflow to pass through, expands and spreads the short fiber strips in an open-fiber manner to form wide fiber strips, and supports and transports the wide fiber strips; the mesh ring is driven by the conveying component, rotates and transports forward along the special-shaped tube, and drives the wide fiber strips attached to the surface of the mesh ring to be transported forward, wraps the core wire in the wrapping area, and forms a core-spun yarn.

[0009] As a further improvement of the present invention, the negative pressure covering component also includes a negative pressure suction port arranged on the special-shaped tube, and the negative pressure suction port is covered by a grid ring arranged on the surface of the special-shaped tube; the negative pressure suction port negatively absorbs the short fiber strands on the surface of the grid ring, so that the wide strands formed on the surface of the grid ring are further expanded and spread in an open-fiber manner, forming a fiber layer with a large width and high parallelism.

[0010] As a further improvement of the present invention, the conveying component includes a front roller, a transmission roller and a bridge component connecting the front roller and the transmission roller. The front roller drives the bridge component to make the transmission roller rotate synchronously; the transmission roller contacts the grid ring and drives the grid ring to rotate forward for transportation.

[0011] As a further improvement of the present invention, the negative pressure suction port includes one of the following shapes: ① a plurality of air ports evenly distributed on the special-shaped tube; ② air ports of equal width formed along the curved surface of the special-shaped tube; ③ air ports arranged on the special-shaped tube, which gradually widen from narrow to wide along the wide strands in the conveying direction of the grid ring.

[0012] As a further improvement of the present invention, the staple fiber drafting and feeding mechanism includes a bell mouth, a rear roller, a rear leather roller, a middle roller, a middle leather roller and a front roller in sequence along the coarse fiber feeding direction; after the coarse fiber is stretched into staple fiber strips by the staple fiber drafting and feeding mechanism, it is output to the special-shaped tube through the front roller and adsorbed on the grid ring by the negative pressure suction port.

[0013] As a further improvement of the present invention, the core feeding mechanism includes a guide wheel for changing the angle of the core wire. The core wire is guided by the guide wheel and output at a certain angle by the jaws of the front roller, and merges with the wide whiskers on the grid ring at a certain angle in the wrapping area. The rotation of the core wire drives the wide whiskers adsorbed by the grid ring to wrap around the outer layer of the core wire to form core-spun yarn.

[0014] As a further improvement of the present invention, a groove of a certain width is provided in the middle of the transmission roller, and the protrusions at both ends of the transmission roller facilitate pressing the grid ring and driving it to rotate and transport. The groove facilitates the wide whiskers and the core wire to pass between the transmission roller and the grid ring; the width of the groove is preferably one third of the width of the transmission roller.

[0015] A method for steadily covering and spinning wide slivers with a special-shaped tube negative pressure grid ring opening fiber type is disclosed, wherein the device is used to prepare core-spun yarn; the specific spinning method is as follows:

[0016] The staple fiber drafting and feeding mechanism drafts the roving into staple fiber strands and feeds them into the negative pressure covering component of the core-spun unit. The staple fiber strands are adsorbed by the negative pressure suction port on the special-shaped tube and then expanded and spread on the mesh ring in an open-fiber manner to form wide strands. The mesh ring is driven forward by the conveying component to rotate and transport the wide strands attached to the surface of the mesh ring forward.

[0017] At the same time, the core yarn is guided by the godet and output at a certain angle through the jaws of the front roller, and merges with the wide whiskers on the mesh ring at a certain angle in the wrapping area. The core yarn rotates and drives the wide whiskers absorbed by the mesh ring to wrap around the outer layer of the core yarn, forming a core-spun yarn.

[0018] The core-spun yarn changes its transmission path through the yarn guide rod, making the structure of the core-spun twisting part more stable, and transports the core-spun yarn to the yarn guide hook of the yarn winding unit, and is wound on the yarn tube by the steel wire ring rotating at high speed on the program board, completing the stable covering spinning process of the special-shaped tube negative pressure grid ring open fiber wide strands.

[0019] As a further improvement of the present invention, the distance between the wrapping zone and the jaws of the front roller is greater than the fiber length of the staple fiber strips, so that the wide strips can be wrapped around the outer layer of the core wire by utilizing the rotation of the core wire; the feeding position of the core wire at the front roller is at a certain distance from the staple fiber strips, and the distance between the core wire and the staple fiber strips is preferably 2 to 5 mm; the angle between the core wire and the wide strips in the wrapping zone is 5° to 65°.

[0020] As a further improvement of the present invention, the yarn guide rod is arranged on the path of the negative pressure covering component outputting the core-spun yarn, and the position setting of the yarn guide rod satisfies the condition that the angle of the short fiber strands input into the core-spun unit and the wide fiber strands remain unchanged when being transported in the core-spun unit.

[0021] The beneficial effects of the present invention are:

[0022] 1. The present invention discloses a special-shaped tube negative pressure grid ring fiber-opening type wide sliver steady-state covering spinning device. By setting a core-spinning unit, cooperating with a core feeding mechanism and a staple fiber drafting feeding mechanism, the special-shaped tube negative pressure grid ring of the core-spinning unit is used to cover the wide sliver formed by uniformly widening and spreading after fiber opening, and uniformly covering the outer layer of the core yarn. This produces a core-spun yarn with a good covering effect and a core yarn ratio of up to 60% to 70%, maximizing the utilization of staple fibers, reducing the raw material cost of the core-spun yarn, and solving the problem that the core yarn on the ring spinning machine is prone to core exposure and encountering bottlenecks in increasing the core yarn ratio. Through the coordinated cooperation of the various units, the device can be applied in industry to achieve industrial high-speed spinning, and the prepared core-spun yarn has good comprehensive performance and a wide range of market applications.

[0023] 2. The present invention utilizes a mesh ring that is rotated and transported along a special-shaped tube to perform fiber-opening and widening of the staple whiskers to form wide whiskers, and the mesh ring only supports and transports the wide whiskers, without applying any twist to the wide whiskers, so that a fiber layer with a certain width, high fiber parallelism, and uniform fiber distribution is formed on the surface of the mesh ring. After the fiber layer merges with the core wire in the wrapping area, the core wire is evenly wrapped around the surface of the core wire by the rotation of the core wire. The present invention increases the holding force of the mesh ring on the wide whiskers by arranging a negative pressure suction port on the special-shaped tube, while reducing the hairiness on the surface of the formed core-spun yarn. Similarly, no twist is formed on the wide whiskers, which is conducive to forming a fiber layer with uniform structure on the surface of the mesh ring. The present invention first spreads the staple whiskers open to form wide whiskers, further forms a fiber layer with a more uniform structure, and then coats the core wire. This not only increases the proportion of core wire, but also saves the amount of roving and reduces the preparation cost of the core-spun yarn.

[0024] 3. In the spinning method of the present invention, after being guided by the godet, the core yarn is fed to the front roller at a certain distance from the staple whiskers, and then output through the jaws of the front roller to merge with the wide whiskers conveyed forward by the mesh ring at a certain angle in the wrapping area. This is conducive to the core yarn's self-rotation driving the wide whiskers adsorbed by the mesh ring to wrap around the outer layer of the core yarn, forming a core-spun yarn with a uniform coating structure; it also avoids the problem of the twist of the bottom yarn being transferred to the staple whiskers, causing them to twist themselves and not utilizing the staple whiskers to expand in an open-fiber manner. In addition, the distance between the wrapping area and the jaws of the front roller is greater than the fiber length of the staple whiskers, so that the core yarn's self-rotation can be better utilized to wrap the wide whiskers around the outer layer of the core yarn. The high-speed rotation of the core yarn can also produce a certain drafting effect on the wide whiskers, further improving the yarn quality of the core-spun yarn.

[0025] 4. The present invention's special-shaped tube negative pressure grid ring open-fiber wide sliver steady-state covering spinning device has low modification cost. In actual production, it is only necessary to improve the core-spinning unit on a conventional ring spinning device and provide a core feeding mechanism with an adjustable angle for feeding the core filament and an adjustable distance from the staple fiber sliver. This can achieve the effect of the present invention's open-fiber wide sliver steady-state covering yarn, resulting in a core-spun yarn with a core filament ratio of up to 60% to 70% and a tightly covered core yarn. The present invention has low modification cost, a wide range of applications, and good industrial application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the special-shaped tube negative pressure grid ring fiber-opening type wide sliver steady-state covering spinning device of the present invention.

[0027] Figure 2 It is a schematic diagram of the partial structure of the core-wrapping unit in the special-shaped tube negative pressure grid ring fiber-opening type wide sliver steady-state covering spinning device of the present invention.

[0028] Figure 3 It is a schematic diagram of the invention's method for steadily covering and spinning wide slivers using a special-shaped tube negative pressure grid ring fiber opening method.

[0029] Figure 4 This is a micrograph of the basalt core-spun yarn prepared in Example 1 of the present invention.

[0030] Figure 5 This is a micrograph of the basalt core-spun yarn prepared in Example 2 of the present invention.

[0031] Figure 6 This is a micrograph of the core-spun yarn prepared in Comparative Example 1.

[0032] Reference numerals

[0033] S1- roving; S11- staple fiber strand; F1- core yarn; 110- staple fiber drafting and feeding mechanism; 111- bell mouth; 112- back roller; 113- back top roller; 114- middle roller; 115- middle top roller; 116- front roller; 120- core feeding mechanism; 121- godet; 200- core wrapping unit; 210- conveying component; 211- front top roller; 212- bridge component; 213- transmission top roller; 220- negative pressure covering component; 221- special-shaped tube; 222- grid ring; 223- negative pressure suction port; 224- wrapping area; 230- yarn guide rod; 300- winding unit; 310- yarn guide hook; 320- wire ring; 330- program board; 340- yarn tube. DETAILED DESCRIPTION

[0034] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] It should also be noted here that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the solutions of the present invention are shown in the drawings, while other details that are not closely related to the present invention are omitted.

[0036] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0037] Example 1

[0038] See also Figure 1As shown, a special-shaped tube negative pressure grid ring open fiber type wide sliver steady-state covering spinning device includes a feeding unit, a core unit 200 and a winding unit 300; the feeding unit includes a core feeding mechanism 120 for feeding the core yarn F1, a short fiber drafting feeding mechanism 110 for drafting the roving S1 into a short fiber sliver S11 and feeding it into the core unit 200; the core unit 200 includes a conveying component 210 for providing power to the core unit 200, a negative pressure covering component 220 and a yarn guide rod 230; the negative pressure covering component 220 draws the short fiber sliver S11 into the core unit 200, and the short fiber drafting feeding mechanism 110 draws the roving S1 into the short fiber sliver S11 and feeds .... 11. The fiber-opening expansion and spreading forms wide strips, and the wide strips are stably covered with the core yarn to obtain core-spun yarn. A heating groove is provided on the yarn guide rod 230, and the temperature of the heating groove is 100-200°C. The higher the modulus of the short fiber used, the higher the glass transition or softening temperature, the higher the setting temperature of the heating groove. The heating groove irons and softens the surface fibers of the passing yarn and improves the smoothness of the yarn. The yarn guide rod 230 changes the transmission path of the yarn output from the core-spun unit 200 through the heating groove, and transports the yarn to the yarn winding unit 300.

[0039] The device is provided with a core-spun unit 200, which cooperates with a core-feeding mechanism 120 and a staple fiber drafting and feeding mechanism 110. The device utilizes the negative pressure grid ring 222 of the shaped tube 221 of the core-spun unit 200 to evenly wrap the wide strands formed after fiber expansion around the outer layer of the core yarn F1. This produces a core-spun yarn with a good wrapping effect and a core yarn F1 ratio of up to 60% to 70%. This maximizes the utilization of staple fibers, reduces the raw material cost of the core-spun yarn, and solves the problem of core yarn being easily exposed and the difficulty in further increasing the core yarn ratio on traditional ring spinning machines. Through the coordinated cooperation of the various units, the device can be applied in industry to achieve industrial high-speed spinning. The produced core-spun yarn has high performance and a wide range of market applications.

[0040] See also Figure 2 As shown, the negative pressure covering component 220 includes a special-shaped tube 221, a mesh ring 222 covering the surface of the special-shaped tube 221, and a wrapping area 224 where the wide fiber strands and the core filament F1 intersect and are covered; the mesh ring 222 only allows airflow to pass through, and expands and spreads the short fiber strands S11 in an open-fiber manner to form wide fiber strands, and supports and transports the wide fiber strands; the mesh ring 222 is driven by the conveying component 210, rotates and transports forward along the special-shaped tube 221, and drives the wide fiber strands attached to the surface of the mesh ring 222 to be transported forward, and wraps the core filament F1 in the wrapping area 224 to form a core-spun yarn. In this way, the grid ring 222 that is rotated and transported along the special-shaped tube 221 is used to expand and spread the short fiber strands S11 in an open-fiber manner to form wide strands, and the grid ring 222 only supports and transports the wide strands without applying any twist to the wide strands, so that a fiber layer with a certain width, high fiber parallelism and uniform fiber distribution is formed on the surface of the grid ring 222. After the fiber layer merges with the core wire F1 in the wrapping area 224, the core wire F1 is rotated to evenly wrap around the surface of the core wire F1.

[0041] In particular, the negative pressure covering component 220 also includes a negative pressure suction port 223 provided on the shaped tube 221. The negative pressure suction port 223 is covered by the mesh ring 222 provided on the surface of the shaped tube 221. The negative pressure suction port 223 negatively absorbs the wide whiskers onto the surface of the mesh ring 222, causing the wide whiskers formed on the surface of the mesh ring 222 to further expand and spread in an open-fiber manner, forming a fiber layer with a large width and high parallelism. In this way, by providing the negative pressure suction port 223 on the shaped tube 221, the holding force of the mesh ring 222 on the wide whiskers is increased, the flatness of the wide whiskers is increased, and the hairiness on the surface of the formed core-spun yarn is reduced. Without forming any twist on the wide whiskers, it is conducive to forming a uniform fiber layer on the surface of the mesh ring 222. The present invention first expands the staple fiber strips S11 in an open-fiber manner to form wide strips, further forms a fiber layer with a uniform structure, and then covers the core filament F1. This not only increases the proportion of core filaments in the core-spun yarn, but also saves the amount of coarse yarn S1 and reduces the preparation cost of the core-spun yarn.

[0042] Specifically, the negative pressure suction port 223 includes one of the following shapes: ① a plurality of ports evenly distributed on the shaped tube 221; ② ports of uniform width formed along the curved surface of the shaped tube 221; ③ ports arranged on the shaped tube 221 and gradually widening along the direction of conveyance of the wide fiber strands in the mesh ring 222. After the negative pressure suction port 223 of the present invention absorbs the staple fiber strands S11, it is expanded and spread on the mesh ring 222 in a fiber-spreading manner to form wide fiber strands, which are evenly dispersed, thereby forming a uniformly structured fiber layer, which facilitates the uniform covering of the wide fiber strands on the core filament F1.

[0043] More specifically, when the negative pressure suction port 223 has the shape ②, the width of the port is 5-10 mm; when the shape ③, the width of the narrowest part of the port is 5-7 mm. This allows the staple fiber strands S11 with a diameter of 1-3 mm to be expanded in a fiber-spreading manner, forming wide strands with interactive forces. By limiting the shape and size of the negative pressure suction port 223, the wide strands are prevented from agglomerating on the mesh ring 222 during negative pressure suction, thereby affecting the subsequent wrapping of the core yarn F1.

[0044] The conveying member 210 includes a front roller 211, a transmission roller 213, and a bridge member 212 connecting the front roller 211 and the transmission roller 213. The front roller 211 drives the bridge member 212, causing the transmission roller 213 to rotate synchronously. The transmission roller 213 contacts the mesh ring 222, driving the mesh ring 222 to rotate forward for transportation. A groove of a certain width is provided in the middle of the transmission roller 213. The projections at both ends of the transmission roller 213 facilitate pressing the mesh ring 222 and driving it for rotational transportation. The groove facilitates the passage of the wide strands and the core yarn F1 between the transmission roller 213 and the mesh ring 222. The width of the groove is preferably one-third of the width of the transmission roller 213.

[0045] In some specific embodiments, a bridge gear is included in the bridge component 212 and is connected to the shaft core of the front roller 211 and the shaft core of the transmission roller 213 to achieve power transmission.

[0046] Specifically, the staple fiber drafting and feeding mechanism 110 includes a bell mouth 111, a rear roller 112, a rear leather roller 113, a middle roller 114, a middle leather roller 115 and a front roller 116 in sequence along the feeding direction of the coarse fiber S1; after the coarse fiber S1 is stretched into staple fiber strips S11 by the staple fiber drafting and feeding mechanism 110, it is output to the special-shaped tube 221 through the front roller 116, and is adsorbed on the grid ring 222 by the negative pressure suction port 223 for fiber-opening expansion and spreading, forming wide strips and even a fiber layer with a more uniform structure. The core feeding mechanism 120 includes a guide wheel 121 for changing the angle of the core yarn F1. The core yarn F1 is guided by the guide wheel 121 and output at a certain angle by the jaws of the front roller 116. It merges with the wide yarn on the mesh ring 222 at a certain angle in the wrapping area 224. The rotation of the core yarn F1 drives the wide yarn adsorbed by the mesh ring 222 to wrap around the outer layer of the core yarn F1 to form a core-spun yarn.

[0047] The guide wheel 121 of the core feeding mechanism 120 can change the angle of the core yarn F1 to control the angle between the core yarn F1 and the wide bead in the wrapping area to range from 5° to 65°, allowing the wide bead to be better rotated and wrapped around the surface of the core yarn F1. The staple drafting feeding mechanism 110 is used to draft the coarse yarn S1 and feed the resulting staple bead S11 into the core wrapping unit 200 for fiber-spreading and widening to form wide bead. The yarn guide rod 230 is arranged on the path of the core yarn output by the negative pressure wrapping component 220. The yarn guide rod 230 is positioned to ensure that the angle of the staple bead S11 remains unchanged when it is input into the core wrapping unit 200 and the wide bead is transported in the core wrapping unit 200. This allows the wide bead to be transported in the core wrapping unit 200 in a natural state without changing its angle. This arrangement not only maintains the integrity of the wide bead or the formed fiber layer and prevents its aggregation, but also facilitates the core yarn F1 to drive the wide bead to wrap around its surface, forming the core yarn.

[0048] By limiting the spacing between the staple fiber strands S11 and the core yarn F1 when they are input into the core wrapping unit 200, and limiting the position of the yarn guide rod 230, the wide strands can be transported in a natural state in the core wrapping unit 200 without changing the transport angle, thereby maintaining the structural integrity and uniformity of the wide strands; an angle is also created between the core material F1 and the wide strands, which is not only beneficial to the wrapping of the core material F1 by the wide strands, but also avoids the twist of the bottom yarn being transferred to the staple fiber strands S11, causing it to twist itself, which is not conducive to the open fiber expansion and spreading of the staple fiber strands S11.

[0049] Compared with the core-spun spinning device in the prior art, the device of the present invention does not form any twist on the wide sliver, but only supports the core filament F1 in a natural state through the support of the grid ring 222; the device is suitable for high-speed ring spinning in actual factories, and will not cause problems such as short fiber accumulation and entanglement during high-speed spinning; in addition, when the short fiber sliver S11 has working problems such as breakage, it is easy for workers to repair it, and no other operations are required on the device.

[0050] See also Figure 3 As shown, a method for steady-state covering spinning of wide slivers with a special-shaped tube negative pressure grid ring opening fiber type is used, and a device for steady-state covering spinning of wide slivers with a special-shaped tube negative pressure grid ring opening fiber type is used to prepare core-spun yarn; the specific spinning method is as follows:

[0051] The staple fiber drafting and feeding mechanism 110 drafts the roving S1 into staple fiber strands S11 and feeds them into the negative pressure covering component 220 of the core-spun unit 200. The staple fiber strands S11 are adsorbed by the negative pressure suction port 223 on the shaped tube 221 onto the mesh ring 222 for fiber-opening expansion and spreading to form wide strands. The conveying component 210 drives the mesh ring 222 to rotate forward and transports the wide strands attached to the surface of the mesh ring 222 forward.

[0052] At the same time, the core yarn F1 is guided by the godet 121 and output at a certain angle through the jaws of the front roller 116. It then merges with the wide strands on the mesh ring 222 at a certain angle in the wrapping area 224. The core yarn F1 rotates and drives the wide strands absorbed by the mesh ring 222 to wrap around the outer layer of the core yarn F1, forming a core-spun yarn.

[0053] The core-spun yarn changes its transmission path through the yarn guide rod 230, making the structure of the core-spun twisting part more stable, and transports the core-spun yarn to the yarn guide hook 310 of the yarn winding unit 300, and is wound on the yarn tube 340 by the steel wire ring 320 rotating at high speed on the program plate 330, completing the stable covering spinning process of the special-shaped tube negative pressure grid ring open fiber wide strand.

[0054] In particular, the distance between the wrapping zone 224 and the jaws of the front roller 116 is greater than the fiber length of the staple fiber sliver S11, so as to better utilize the rotation of the core wire F1 to wrap the wide sliver around the outer layer of the core wire F1; the feeding position of the core wire F1 at the front roller 116 is at a certain distance from the staple fiber sliver S11, and the distance between the core wire F1 and the staple fiber sliver S11 is preferably 2 to 5 mm; the angle between the core wire F1 and the wide sliver in the wrapping zone 224 is 5° to 65°.

[0055] In this special-shaped tube negative pressure grid ring covering spinning method, after being guided by the yarn guide wheel 121, the core yarn F1 is limited to be fed to the front roller 116 at a certain distance from the short fiber whiskers S11, and then output through the jaws of the front roller 116. It merges with the wide whiskers conveyed forward by the grid ring 222 at a certain angle in the wrapping area 224. The rotation of the core yarn F1 can drive the wide whiskers adsorbed by the grid ring 222 to wrap around the outer layer of the core yarn F1, forming a core-spun yarn with a uniform covering structure. In addition, the distance between the wrapping area 224 and the jaws of the front roller 116 is greater than the fiber length of the short fiber whiskers, so that the rotation of the core yarn F1 can be better utilized to wrap the wide whiskers around the outer layer of the core yarn F1. The high-speed rotation of the core yarn F1 can also produce a certain drafting effect on the wide whiskers, further improving the yarn quality of the core-spun yarn.

[0056] See also Figure 4 As shown, Figure 4 This 43.57-tex basalt core-spun yarn, produced at 35x 3D microscope magnification, was produced using a shaped tube negative pressure grid ring open-fiber wide-sliver steady-state covering spinning device and method. The core yarn is made of 25-tex basalt filament and 50D flame-retardant polyester filament; the staple fiber is 735-tex cotton roving. Process parameters are: spindle speed: 11,000 r / min; twist: 90 T / 10cm; front roller speed: 12.22 m / min; total draft: 56.24; and back zone draft: 1.15. The core yarn accounts for 70% of the core yarn.

[0057] from Figure 4 It can be clearly seen that when the core yarn accounts for 70%, the outer fibers in the basalt core-spun yarn completely cover the core material without any exposure; the overall yarn covering effect is good, and the outer covering fibers are highly parallel.

[0058] Example 2

[0059] This embodiment provides a special-shaped tube negative pressure grid ring open fiber wide whisker steady-state covering spinning device and method. Compared with Example 1, the difference is that the core wire material is: 12tex basalt filament + 20D flame retardant nylon filament; the staple fiber whisker material is: 600tex flame retardant nylon, aramid 1313, flame retardant viscose composite staple roving (blending ratio is: 55 / 35 / 10); process parameters: spindle speed: 8500r / min; twist: 75T / 10cm; front roller line speed: 11.33m / min; total drafting multiple: 63.36; rear zone drafting: 1.65.

[0060] See also Figure 5 As shown in Example 2, a 23.67tex basalt core-spun yarn is spun using a 50x 3D microscope magnification using a special-shaped tube negative pressure grid ring open fiber wide whisker steady-state covering spinning device and method. The core yarn accounts for 60% of the core yarn. Figure 5 It can be seen that under a higher magnification microscope, when the core wire accounts for 60%, the outer fibers in the basalt core-spun yarn completely cover the core material without any exposure; and the overall yarn covering effect is good, and the outer covering fibers are highly parallel.

[0061] Comparative Example 1

[0062] Comparative Example 1 provides a core-spun yarn device and method. The device is a conventional ring spinning device, lacking the negative pressure sheathing component 220 of Example 1. The spinning method involves gathering staple fiber strands around a core yarn and twisting them to produce a core-spun yarn. The core yarn material is 162D blue polyester yarn; the staple fiber strand material is 653tex red cotton roving. Process parameters include: spindle speed of 11,000 r / min; twist of 104T / 10cm; front roller speed of 10.58m / min; total draft ratio of 54.42; cortex cotton fiber linear density of 12.00tex; and back zone draft of 1.25. The core yarn comprises 60% of the core yarn.

[0063] See also Figure 6 As shown, compared with Example 2, under the condition of the same core wire ratio, the outer fiber of the conventional ring-spun core-spun yarn cannot completely cover the core wire, and there is a serious exposure phenomenon; the overall yarn covering effect is poor; the core-spun yarn is difficult to use in actual production. If this situation is to be improved, the core wire ratio can only be sacrificed. Therefore, the core wire ratio of the traditional ring-spun core-spun yarn is low, and it is about 15% to obtain a core-spun yarn with the outer layer fiber more completely covering the core wire.

[0064] In summary, the present invention provides a device and method for steadily covering spinning of wide fiber strips with a special-shaped tube negative pressure grid ring fiber opening type, the device comprising a feeding unit, a core-wrapping unit and a winding unit; the feeding unit comprises a core-feeding mechanism for feeding core wire, a short fiber drafting and feeding mechanism for drawing the coarse yarn into short fiber strips and feeding them into the core-wrapping unit; the core-wrapping unit comprises a conveying component for providing power to the core-wrapping unit, a negative pressure covering component and a yarn guide rod, the negative pressure covering component opens and widens the short fiber strips to form wide strips, the wide strips further steadily cover the core wire to obtain core-wrapped yarn, the yarn guide rod changes the transmission path of the yarn output from the core-wrapping unit, and conveys the yarn to the yarn winding unit. The present invention provides a core-spun unit, coordinated with a core feeding mechanism and a staple fiber drafting feeding mechanism, and utilizes the core-spun unit's shaped tube negative pressure grid ring to evenly wrap the wide strands after opening onto the outer layer of the core yarn. This produces a core-spun yarn with good wrapping effect and a large core yarn ratio, with the core yarn ratio reaching 60% to 70%. This maximizes the utilization of staple fibers, reduces the raw material cost of the core-spun yarn, and solves the problem of traditional ring-spun core-spun yarn being prone to core exposure and having a low core yarn ratio. Through the coordinated cooperation of the various units, the device can be applied in industry to achieve industrial high-speed spinning, and the prepared core-spun yarn has high performance and wide market application.

[0065] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A special-shaped tube negative pressure grid ring fiber-opening type wide strand steady-state coating spinning device, characterized in that: It comprises a feeding unit, a core-wrapping unit and a winding unit; the feeding unit comprises a core-feeding mechanism for feeding core yarn, a staple drafting and feeding mechanism for drafting roving into staple strands and feeding the staple strands into the core-wrapping unit; the core-wrapping unit comprises a conveying component for providing power to the core-wrapping unit, a negative pressure covering component and a yarn guide rod; the negative pressure covering component expands and spreads the staple strands into wide strands in an open-fiber manner, and the wide strands are stably covered with the core yarn to obtain core-spun yarn; a heating groove is provided on the yarn guide rod, and the temperature of the heating groove is 100-200°C. The yarn guide rod changes the transmission path of the yarn output from the core-wrapping unit through the heating groove and conveys the yarn to the winding unit; The negative pressure covering component includes a special-shaped tube, a mesh ring covering the surface of the special-shaped tube, and a wrapping area where the wide beard strips and the core wire intersect and wrap; the mesh ring only allows airflow to pass through, expands and spreads the short fiber strips in an open-fiber manner to form wide beard strips, and supports and transports the wide beard strips; the mesh ring is driven by the conveying component, rotates and transports forward along the special-shaped tube, and drives the wide beard strips attached to the surface of the mesh ring to be transported forward, wrapping the core wire in the wrapping area to form a core-spun yarn; The negative pressure covering component further includes a negative pressure air suction port provided on the special-shaped tube, and the negative pressure air suction port is covered by a mesh ring provided on the surface of the special-shaped tube; the negative pressure air suction port negatively absorbs the short fiber strands onto the surface of the mesh ring, so that the wide strands formed on the surface of the mesh ring are further expanded and spread in an open-fiber manner, forming a fiber layer with a large width and high parallelism; The negative pressure air suction port is arranged on the special-shaped tube, and is an air suction port that gradually widens from narrow to wide along the wide whiskers in the conveying direction of the grid ring.

2. The special-shaped tube negative pressure grid ring fiber-opening wide strand steady-state covering spinning device according to claim 1 is characterized in that: The conveying component includes a front roller, a transmission roller and a bridge component connecting the front roller and the transmission roller. The front roller drives the bridge component to make the transmission roller rotate synchronously; the transmission roller contacts the grid ring and drives the grid ring to rotate forward for transportation.

3. The special-shaped tube negative pressure grid ring fiber-opening wide strand steady-state covering spinning device according to claim 1 is characterized in that: The staple fiber drafting and feeding mechanism includes a bell mouth, a rear roller, a rear top roller, a middle roller, a middle top roller and a front roller in sequence along the coarse fiber feeding direction; after the coarse fiber is drafted into staple fiber strips by the staple fiber drafting and feeding mechanism, it is output to the special-shaped tube through the front roller and is adsorbed on the grid ring by the negative pressure suction port.

4. The special-shaped tube negative pressure grid ring fiber-opening wide-strip steady-state covering spinning device according to claim 3 is characterized in that: The core feeding mechanism includes a guide wheel for changing the angle of the core wire. The core wire is guided by the guide wheel and output at a certain angle by the jaws of the front roller, and merges with the wide whiskers on the grid ring at a certain angle in the wrapping area. The core wire rotates and drives the wide whiskers absorbed by the grid ring to wrap around the outer layer of the core wire to form core-spun yarn.

5. The special-shaped tube negative pressure grid ring fiber-opening wide strand steady-state covering spinning device according to claim 2 is characterized in that: A groove of a certain width is provided in the middle of the transmission roller, and the protrusions at both ends of the transmission roller facilitate pressing the grid ring and driving it to rotate and transport. The groove facilitates the wide whiskers and the core wire to pass between the transmission roller and the grid ring; the width of the groove is one third of the width of the transmission roller.

6. A method for steady-state coating spinning of wide slivers using a special-shaped tube negative pressure grid ring, characterized in that: The core-spun yarn is prepared by using the special-shaped tube negative pressure grid ring open fiber wide sliver steady-state coating spinning device according to any one of claims 1 to 5; the specific spinning method is: The staple fiber drafting and feeding mechanism drafts the roving into staple fiber strands and feeds them into the negative pressure covering component of the core-spun unit. The staple fiber strands are adsorbed by the negative pressure suction port on the special-shaped tube and then expanded and spread on the mesh ring in an open-fiber manner to form wide strands. The mesh ring is driven forward by the conveying component to rotate and transport the wide strands attached to the surface of the mesh ring forward. At the same time, the core yarn is guided by the godet and output at a certain angle through the jaws of the front roller, and merges with the wide whiskers on the mesh ring at a certain angle in the wrapping area. The core yarn rotates and drives the wide whiskers absorbed by the mesh ring to wrap around the outer layer of the core yarn, forming a core-spun yarn. The core-spun yarn changes its transmission path through the yarn guide rod, making the structure of the core-spun twisting part more stable, and transports the core-spun yarn to the yarn guide hook of the winding unit, and is wound on the yarn tube by the steel wire ring rotating at high speed on the program board, completing the stable covering spinning process of the special-shaped tube negative pressure grid ring open fiber wide strands.

7. The method for steadily covering and spinning wide slivers with a special-shaped tube negative pressure grid ring according to claim 6 is characterized in that: The distance between the wrapping zone and the jaws of the front roller is greater than the fiber length of the staple fiber strands, so that the wide strands can be wrapped around the outer layer of the core wire by utilizing the rotation of the core wire; the feeding position of the core wire at the front roller is at a certain distance from the staple fiber strands, and the distance between the core wire and the staple fiber strands is 2~5mm; the angle between the core wire and the wide strands in the wrapping zone is 5°~65°.

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