Ring spinning fiber-opening mechanically assisted core-spun yarn device and method

Abstract

The present invention provides a ring spinning open-fiber mechanically assisted core-spinning device and method, the device comprising a feeding unit, a core-spinning auxiliary unit, and a yarn winding unit; the core-spinning auxiliary unit comprising an auxiliary core-spinning module, a roller pressure module for applying pressure to the auxiliary core-spinning module, and a yarn guide module; the auxiliary core-spinning module is internally provided with a short fiber channel and a filament channel spaced a certain distance apart. The present invention uses the auxiliary core-spinning module to form a short fiber layer of a certain width and uniform structure in the short fiber channel; and in conjunction with other units and modules of the device, the short fiber layer is tightly wrapped around the core filament, producing a core-spinning yarn with good covering effect and a large core filament ratio, thereby maximizing the utilization of the short fibers and reducing the raw material cost of the core-spinning yarn. The core-spinning device solves the problem of core-spinning yarn produced by traditional ring spinning machines easily exposing the core and having a low core filament ratio. The core-spinning device has low modification cost, a wide range of applications, and high industrial application value.

Description

Technical Field

[0001] The present invention relates to the technical field of textile equipment, and in particular to a ring spinning fiber-opening type mechanically assisted core-spinning device and method. Background Art

[0002] Core-spun yarn is a type of yarn composed of two or more fibers. This popular staple fiber core-spun yarn combines the strengths of the outer staple fibers with the core yarn, optimizing the yarn's structure and properties by leveraging their respective strengths and minimizing their weaknesses. 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] In the prior art, an invention patent (application number CN 201610574251.X) discloses a method for producing carbon fiber core-spun yarn fabrics, in which pretreated carbon fiber filament bundles are fed into the front roller jaws through the core-spun yarn device of a cotton spinning frame, and short fiber rovings are fed into the rear rollers from the bell mouth of the cotton spinning frame. The drafted short fiber whiskers are wrapped around the carbon fiber filament bundles at the front roller jaws, and the two are twisted together to obtain carbon fiber core-spun yarn. However, in this core-spun yarn production method, during the twisting process of the drafted short fiber whiskers and the filaments, the short fiber whiskers are prone to self-twist, and the self-twisted short fiber whiskers have a poor wrapping effect on the filaments, which is prone to core leakage problems.

[0004] At present, my country's textile industry mostly uses ring spinning to prepare core-spun yarn. For example, the invention patent (application number CN201410333454.0) discloses a ring-spun composite spinning device and spinning method, in which the roving is fed into the drafting zone, and the core yarn is fed from the middle position of the front jaw of the single drafting zone. After drafting, the roving whiskers and core yarn output from the front jaw all enter the V-groove on the gathering wheel. The yarn coming out of the V-groove on the V-groove gathering wheel passes through the V-groove regulating wheel and then passes through the yarn guide hook and the wire ring to be wound on the bobbin to produce the core-spun yarn. In this method, the roving whiskers and the core yarn are compounded in a concentrated twisting manner. The resulting core-spun yarn is very prone to core leakage, and the core yarn ratio is difficult to increase. The core yarn ratio is generally below 15%.

[0005] In view of this, it is necessary to design an improved ring spinning fiber-opening mechanically assisted core-spun spinning device and method to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a ring spinning open fiber type mechanically assisted core-spinning device and method, the device is provided with an auxiliary core-spinning module with a special structure, so that the staple fiber strands form a staple fiber layer with a certain width and uniform structure in the staple fiber channel; and cooperate with the feeding unit, other modules of the core-spinning auxiliary unit and the yarn winding unit to achieve tight wrapping of the staple fiber layer on the core wire, and obtain core-spinning yarn with good covering effect and a relatively large proportion of core wire, so as to maximize the utilization of staple fibers and reduce the raw material cost of core-spinning yarn; solve the problem that the core-spinning yarn on the ring spinning machine is prone to core exposure and the proportion of core wire is not large.

[0007] In order to achieve the above-mentioned purpose of the invention, the present invention provides a ring spinning open fiber type mechanically assisted core spinning device, comprising a feeding unit, a core winding auxiliary unit and a yarn winding unit; the feeding unit comprises a core wire feeding mechanism for feeding core wire, and a short fiber drawing feeding mechanism for drawing the coarse yarn into short fiber strips and feeding them into the core winding auxiliary unit; the core winding auxiliary unit comprises an auxiliary core winding module, a roller pressure module for applying pressure to the auxiliary core winding module, and a yarn guide module, and the yarn guide module is arranged between the auxiliary core winding module and the yarn winding unit; the interior of the auxiliary core winding module is provided with a short fiber channel and a filament channel spaced a certain distance apart, and the width of the short fiber channel is 5 to 10 mm.

[0008] As a further improvement of the present invention, the staple fiber channel is a channel of equal width along the conveying direction of the staple fiber strands, or a channel with a shape that gradually widens from narrow to wide, so as to avoid the generation of agglomerating force on the staple fiber strands, so that the staple fiber strands form a staple fiber layer with a certain width therein; when the staple fiber channel is a channel with a shape that gradually widens from narrow to wide, the width of the narrow channel opening is 5 to 7 mm.

[0009] As a further improvement of the present invention, the interval between the short fiber channel and the long fiber channel is 2 to 5 mm; and the width of the long fiber channel is 3 to 5 mm.

[0010] As a further improvement of the present invention, the yarn guiding module includes a yarn guiding rod and a heating groove arranged on the yarn guiding rod; the position of the heating groove on the yarn guiding rod is opposite to the output port of the short fiber channel, so that the short fiber strands are output from the short fiber channel in a straight line, and the core wire is output from the filament channel in a broken line and offset toward the short fiber strands, and the core wire and the short fiber strands meet in the wrapping area at a certain angle; the temperature of the heating groove is 100-200°C.

[0011] As a further improvement of the present invention, a negative pressure suction component is provided inside the auxiliary core wrapping module, and a plurality of uniform grid holes are provided on the surface of the short fiber channel facing the negative pressure suction component. The short fiber strands in the short fiber channel are adsorbed by the negative pressure suction component through the grid holes, so that the short fiber strands are spread flat on the inner surface of the short fiber channel to form a short fiber layer with uniform structure.

[0012] As a further improvement of the present invention, the staple fiber drafting 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 feeding and drafting direction of the coarse yarn; the front roller is arranged in contact with the auxiliary core-wrapped module.

[0013] As a further improvement of the present invention, the leather roller pressure module includes a front leather roller and a bridge component connecting the front leather roller and the auxiliary core-wrapping module; the front leather roller and the front roller are arranged opposite to each other, and a jaw is formed between the two, and the staple fiber strips and the core yarn are output from the jaw and enter the auxiliary core-wrapping module; the bridge component applies pressure to the auxiliary core-wrapping module so that the inner side of the auxiliary core-wrapping module is attached to the surface of the front roller.

[0014] As a further improvement of the present invention, the core wire feeding unit includes a guide wire wheel for changing the angle of the core wire; the core wire is guided by the guide wire wheel and input into the filament channel from the nip between the front roller and the front roller at a certain angle. After output, it merges with the staple fiber strips output from the staple fiber channel in the wrapping area at a certain angle. The rotation of the core wire drives the staple fiber strips to wrap around the outer layer of the core wire to form core-spun yarn.

[0015] A ring spinning open-fiber mechanically assisted core-spun spinning method, which uses any of the above-mentioned ring spinning open-fiber mechanically assisted core-spun spinning devices to prepare core-spun yarn, specifically:

[0016] The staple fiber drafting and feeding mechanism drafts the roving into staple fiber strands, and conveys the staple fiber strands into the staple fiber channel of the auxiliary core-spun module through the nip between the front top roller and the front roller. The staple fiber strands form a staple fiber layer in the staple fiber channel, and the staple fiber layer is output from the staple fiber channel and conveyed forward along the operation of the front roller.

[0017] At the same time, the core yarn is guided by the godet and input into the filament channel of the auxiliary core-spun module from the nip between the front top roller and the front roller at a certain angle. After output, it merges with the staple fiber layer on the surface of the front roller in the wrapping area at a certain angle. The rotation of the core yarn drives the staple fiber layer to wrap around the outer layer of the core yarn to form a core-spun yarn.

[0018] The core-spun yarn passes through the heating groove on the yarn guide rod to achieve the positioning of the yarn path and eliminate the lateral movement of the yarn caused by airflow; the yarn guide rod transports the core-spun yarn to the yarn guide hook of the yarn winding unit, and the steel wire ring rotating at high speed on the guide plate is wound on the yarn tube to complete the core-spun spinning process.

[0019] As a further improvement of the present invention, the distance between the wrapping area and the jaws is greater than the fiber length of the staple fiber strips, so that the staple fiber strips can be wrapped around the surface of the core wire by utilizing the rotation of the core wire; the input distance between the staple fiber strips and the core wire in the jaws is 2 to 5 mm.

[0020] The beneficial effects of the present invention are:

[0021] 1. The present invention provides a ring-spinning open-fiber mechanically assisted core-spinning device and method. The device comprises a feeding unit, a core-spinning auxiliary unit, and a yarn winding unit. The core-spinning auxiliary unit comprises an auxiliary core-spinning module, a roller pressure module for applying pressure to the auxiliary core-spinning module, and a yarn guide module. The core-spinning device of the present invention utilizes a specially structured auxiliary core-spinning module to form a uniformly structured short fiber layer of a certain width within the short fiber channel. The device, in conjunction with the feeding unit, other modules of the core-spinning auxiliary unit, and the yarn winding unit, achieves tight wrapping of the short fiber layer around the core filament, resulting in a core-spinning yarn with a good wrapping effect and a high core filament ratio. This maximizes the utilization of the short fibers and reduces the raw material cost of the core-spinning yarn. This device solves the problem of core-spinning yarn being prone to core exposure and a low core filament ratio on ring spinning machines. Through the coordinated cooperation of various units, the device can be applied in industrial production, achieving industrial high-speed, batch spinning. The core-spinning yarn produced has excellent overall performance and has great market application prospects.

[0022] 2. The auxiliary core-wrapping module of the present invention is internally provided with a short fiber channel and a filament channel at a certain distance. The width of the short fiber channel is 5 to 10 mm, and the shape of the short fiber channel is limited to be equal in width along the conveying direction of the short fiber whiskers, or gradually widened from narrow to wide; in the high-speed spinning process, the coarse yarn is stretched by the short fiber stretching feeding mechanism to form short fiber whiskers with a diameter of 1 to 3 mm. After the short fiber whiskers enter the short fiber channel, they rely on their own force to form a short fiber layer with a certain width, high fiber parallelism and uniform fiber distribution in the wider channel; after the short fiber layer merges with the core wire in the wrapping area, it utilizes the rotation of the core wire to evenly wrap around the surface of the core wire, achieving a better wrapping effect. In addition, the short fiber channel with a larger width set by the present invention only supports and transports the short fiber whiskers, and does not apply any twist to the short fiber whiskers, thereby avoiding the aggregation of the short fiber whiskers, which is not conducive to the subsequent coating of the core wire.

[0023] 3. The present invention limits the core filament and the staple fiber strands to enter the nip between the front roller and the front roller at a certain distance, the staple fiber channel and the filament channel are separated by a certain distance, and the core filament is offset toward the staple fiber strands after being output from the filament channel by the limitation of the yarn guide module. In this way, the staple fiber strands and the staple fiber layer do not need to change their angles and are transported in a natural state in the core-wrapping auxiliary unit, thus ensuring the integrity of the staple fiber strands or staple fiber layer and preventing them from agglomerating; the core filaments merge at a certain angle with the staple fiber layer formed by the staple fiber strands in the wrapping area, which is not only conducive to the core filament's self-rotation driving the staple fiber layer to wrap around the outer layer of the core filament to form a core-spun yarn with a uniform coating structure, but also avoids the problem that the twist of the bottom yarn is transferred to the staple fiber strands, causing them to twist themselves, which is not conducive to the formation of the staple fiber layer. In addition, the distance between the wrapping area and the jaws between the front roller and the front roller is greater than the fiber length of the staple fiber sliver, so as to better utilize the rotation of the core wire to wrap it on the outer layer of the core wire, and the high-speed rotation of the core wire can also produce a certain stretching effect on the staple fiber sliver, further improving the spinning quality of the core-spun yarn.

[0024] 4. The present invention also provides a negative pressure suction assembly in the auxiliary core-spun module, which not only increases the holding force of the staple channel on the staple whiskers, but also reduces the hairiness on the surface of the core-spun yarn. It does not impart any twist to the staple whiskers, which is conducive to the formation of a uniform staple fiber layer in the staple channel. By first forming the staple whiskers into a wider staple layer and then coating the core yarn, the present invention increases the core yarn ratio of the core-spun yarn, while saving the amount of coarse yarn and reducing the production cost of the core-spun yarn.

[0025] 5. The core-spun spinning device of the present invention only needs to improve the core-spun auxiliary unit on the ordinary ring spinning device to realize the opening of the staple fiber strips and form a staple fiber layer. At the same time, a core wire feeding mechanism is set so that the angle of the feeding core wire and the distance from the staple fiber strips can be adjusted, thereby achieving the effect of tightly wrapping the staple fiber strips into yarns of the present invention; the device has low modification cost, wide application range, and good industrial application prospects and value. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the ring spinning fiber-opening type mechanically assisted core-spinning device of the present invention.

[0027] Figure 2 This is a schematic diagram of the specific structure of the core-wrapping auxiliary unit in Example 1 of the present invention.

[0028] Figure 3 for Figure 1 A magnified view of the local structure of the core auxiliary unit.

[0029] Figure 4 for Figure 2 Schematic diagram of the internal local structure of the auxiliary core module.

[0030] Figure 5 It is a schematic diagram of the ring spinning fiber-opening mechanically assisted core-spinning method of the present invention.

[0031] Figure 6 This is a polyester-cotton core-spun yarn spun by the ring-spinning open-fiber mechanically assisted core-spun yarn device and method in Example 1 under 35 times 3D microscope magnification.

[0032] Figure 7 This is a polyester-cotton core-spun yarn spun by the ordinary ring spinning core-spun yarn method of Comparative Example 1 under 35 times 3D microscope magnification.

[0033] Figure 8 This is the polyester-cotton core-spun yarn spun in Comparative Example 2 under 35x 3D microscope magnification.

[0034] Reference numerals

[0035] S1- roving; S11- staple fiber sliver; S2- core yarn; 110- core yarn feeding mechanism; 111- godet; 120- staple fiber drafting and feeding mechanism; 121- bell mouth; 122- back roller; 123- back top roller; 124- middle roller; 125- middle top roller; 126- front roller; 200- core winding auxiliary unit; 210- auxiliary core winding module; 211- staple fiber channel; 212- filament channel; 213- wrapping area; 220- top roller pressure module; 221- front top roller; 222- bridge component; 230- yarn guide module; 231- yarn guide rod; 232- heating groove; 300- yarn winding unit; 310- yarn guide hook; 320- wire ring; 330- program board; 340- bobbin. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] 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.

[0039] Example 1

[0040] See also Figure 1As shown, a ring spinning open fiber type mechanically assisted core spinning device includes a feeding unit, a core spinning auxiliary unit 200 and a yarn winding unit 300; the feeding unit includes a core yarn feeding mechanism 110 for feeding a core yarn S2, and a staple fiber drafting feeding mechanism 120 for drafting the roving S1 into a staple fiber sliver S11 and feeding it into the core spinning auxiliary unit 200; the core spinning auxiliary unit 200 includes an auxiliary core spinning module 210, a roller pressure module 220 for applying pressure to the auxiliary core spinning module 210, and a yarn guide module 230, and the yarn guide module 230 is arranged between the auxiliary core spinning module 210 and the yarn winding unit 300; the interior of the auxiliary core spinning module 210 is provided with a staple fiber channel 211 and a filament channel 212 spaced a certain distance apart, and the width of the staple fiber channel 211 is 5 to 10 mm.

[0041] The core-spun spinning device of the present invention is equipped with a specially structured auxiliary core-spun module 210, which enables the staple fiber strands S11 to form a uniformly structured staple fiber layer of a certain width in the staple fiber channel 211. Furthermore, in conjunction with the feeding unit, other modules of the core-spun auxiliary unit 200, and the yarn winding unit 300, the staple fiber layer tightly wraps around the core yarn S2, resulting in a core-spun yarn with a good coating effect and a core yarn ratio of up to 60% to 70%. This maximizes the utilization of the staple fibers and reduces the raw material cost of the core-spun yarn. This device solves the problem of core-spun yarn being prone to core exposure and a low core yarn ratio on ring spinning machines. Through the coordinated cooperation of various units, the device can be applied in industrial production, achieving industrial high-speed, batch spinning, and producing core-spun yarn with good overall performance, which has great market application prospects.

[0042] In particular, see Figures 2 to 4 As shown, the staple fiber channel 211 is a channel of uniform width along the conveying direction of the staple fiber strand S11, or a channel with a gradually widening shape. This prevents the staple fiber strand S11 from generating agglomeration force, so that the staple fiber strand S11 forms a staple fiber layer of a certain width therein. When the staple fiber channel 211 is a channel with a gradually widening shape, the width of the narrow channel opening is 5 to 7 mm. With this arrangement, during the high-speed spinning process, the roving S1 is drafted by the staple fiber drafting feeding mechanism 120 to form a 1 to 3 mm staple fiber strand S11. After the staple fiber strand S11 enters the staple fiber channel 211, it relies on its own force to form a staple fiber layer of a certain width, high fiber parallelism, and uniform fiber distribution in the wider channel. After the staple fiber layer merges with the core filament S2 in the wrapping area 213, the core filament S2 is rotated to evenly wrap around the surface of the core filament S2, achieving a better wrapping effect. In addition, the larger staple fiber channel 211 provided in the present invention only supports and transports the staple fiber strands S11 and does not apply any twist to the staple fiber strands S11, thereby avoiding the aggregation of the staple fiber strands S11 and hindering the subsequent covering of the core yarn S2.

[0043] Specifically, the distance between the staple channel 211 and the filament channel 212 is 2 to 5 mm; the width of the filament channel 212 is 3 to 5 mm. The yarn guide module 230 includes a yarn guide rod 231 and a heating groove 232 provided on the yarn guide rod 231; the heating groove 232 is located on the yarn guide rod 231 directly opposite the output port of the staple channel 211, so that the staple fiber strand S11 is output from the staple fiber channel 211 in a straight line, and the core fiber S2 is output from the filament channel 212 in a broken line and offset toward the staple fiber strand S11. The core fiber S2 and the staple fiber strand S11 meet at a certain angle in the wrapping area 213. In this way, the short fiber channel 211 is spaced a certain distance from the filament channel 212, and the core wire S2 is offset toward the short fiber strip S11 after being output from the filament channel 212 by the limitation of the yarn guide module 230; in this way, the core wire S2 converges with the short fiber layer formed by the short fiber strip S11 at a certain angle in the wrapping area, which is not only conducive to the self-rotation of the core wire S2 to drive the short fiber layer to wrap around the outer layer of the core wire S2, forming a core-spun yarn with a uniform coating structure, but also avoids the twist of the bottom yarn being transferred to the short fiber strip S11, causing it to twist itself, which is not conducive to the formation of the short fiber layer. In addition, in this process, there is no need to change the angle of the short fiber strip S11, so that it can be transported to the short fiber channel 211 in a natural state to maintain the integrity of the short fiber layer formed by the short fiber strip S11 in the short fiber channel 211 and avoid its aggregation.

[0044] It should be noted that the temperature of the heating groove 232 on the inner side of the yarn guide rod 231 is 100-200°C. The higher the modulus of the short fiber used and the higher the glass transition or softening temperature, the higher the set temperature of the heating groove 232. In addition to positioning the yarn path, the surface fibers of the yarn can also be ironed and softened, the smoothness of the yarn can be improved, and the yarn path from the jaws of the front roller 126 and the front leather roller 221 to the yarn guide rod 231 can be attached to the surface of the front roller 126; the yarn tension on the front roller 126 can also be adjusted by adjusting the upper and lower positions of the yarn guide rod 231 perpendicular to the yarn path, while eliminating the lateral movement of the yarn caused by the air ring, making the structure of the core twisting more stable.

[0045] In some other embodiments, a negative pressure suction assembly is provided inside the auxiliary core-spun module 210, and a plurality of uniform mesh holes are provided on the surface of the short fiber channel 211 facing the negative pressure suction assembly. The short fiber whiskers S11 in the short fiber channel 211 are adsorbed by the negative pressure suction assembly through the mesh holes, so that the short fiber whiskers S11 are spread on the inner surface of the short fiber channel 211 to form a short fiber layer with uniform structure. The provision of a negative pressure suction assembly not only increases the holding force of the short fiber channel 211 on the short fiber whiskers S11, but also reduces the hairiness on the surface of the formed core-spun yarn, and does not form any twist on the short fiber whiskers S11, which is conducive to the formation of a uniform short fiber layer in the short fiber channel 211. The present invention increases the core fiber ratio of the core-spun yarn by first forming the short fiber whiskers S11 into a wider short fiber layer and then coating the core yarn S2, while saving the amount of coarse yarn and reducing the preparation cost of the core-spun yarn.

[0046] Compared with the core-spun spinning device in the prior art, the core-spun spinning device of the present invention does not form any twist on the staple fiber sliver S11, nor does it cause it to aggregate. It only supports the staple fiber channel 211 to enable it to cover the core filament S2 in a natural state. The device is suitable for high-speed ring spinning in actual factories. It will not apply excess force to the staple fiber sliver S11 during high-speed spinning, causing it to curl or aggregate, resulting in staple fiber accumulation, entanglement and other problems, and can form a staple fiber layer with uniform structure.

[0047] See also Figure 2 As shown, the staple fiber drafting and feeding mechanism 120 includes, in sequence along the feeding and drafting direction of the roving S1, a bell mouth 121, a back roller 122, a back top roller 123, a middle roller 124, a middle top roller 125, and a front roller 126. The front roller 126 is arranged in contact with the auxiliary core-covering module 210. The top roller pressure module 220 includes a front top roller 221 and a bridge component 222 connecting the front top roller 221 and the auxiliary core-covering module 210. The front top roller 221 and the front roller 126 are arranged opposite each other, forming a jaw between them. The staple fiber strand S11 and the core yarn S2 are both output from the jaw and enter the auxiliary core-covering module 210. The bridge component 222 applies pressure to the auxiliary core-covering module 210, causing its inner side to contact the surface of the front roller 126.

[0048] The core yarn feeding unit 110 includes a guide wheel 111 for changing the angle of the core yarn S2; the core yarn S2 is guided by the guide wheel 111 and input into the filament channel 212 from the nip between the front roller 221 and the front roller 126 at a certain angle. After output, it merges with the staple fiber strip S11 output from the staple fiber channel 211 in the wrapping area 213 at a certain angle. The rotation of the core yarn S2 drives the staple fiber strip S11 to wrap around the outer layer of the core yarn S2 to form a core-spun yarn.

[0049] The core-spun spinning device of the present invention only needs to improve the core-spun auxiliary unit on the ordinary ring spinning device to realize the fiber opening of the staple fiber sliver S11 and form a staple fiber layer. At the same time, a core wire feeding mechanism 110 is provided so that the angle of the feeding core wire S2 and the distance from the staple fiber sliver S11 can be adjusted, thereby achieving the effect of tightly wrapping the staple fiber sliver into yarn of the present invention; the device has low modification cost, wide application range, and good industrial application prospects and value.

[0050] A ring spinning open fiber type mechanical assisted core spinning method, using a ring spinning open fiber type mechanical assisted core spinning device to prepare core yarn, the specific method and process are as follows Figure 5 As shown:

[0051] The staple fiber drafting and feeding mechanism 120 drafts the roving S1 into a staple fiber sliver S11, which is then fed into the staple fiber channel 211 of the auxiliary core-spinning module 210 through the nip between the front top roller 221 and the front roller 126. The staple fiber sliver S11 forms a staple fiber layer in the staple fiber channel 211, which is then output from the staple fiber channel 211 and fed forward along the movement of the front roller 126.

[0052] At the same time, the core yarn S2 is guided by the godet 111 and fed into the filament channel 212 of the auxiliary core-spun yarn module 210 through the nip between the front top roller 221 and the front roller 126 at a certain angle. After being fed out, it merges with the staple fiber layer on the surface of the front roller 126 at a certain angle in the wrapping area 213. The rotation of the core yarn S2 drives the staple fiber layer to wrap around the outer layer of the core yarn S2, forming a core-spun yarn.

[0053] The core-spun yarn passes through the heating groove 232 on the yarn guide rod 231 to achieve the positioning of the yarn path and eliminate the lateral movement of the yarn caused by airflow; the yarn guide rod 231 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 guide plate 330, completing the core-spun spinning process.

[0054] In particular, the distance between the wrapping zone 213 and the jaws is greater than the fiber length of the staple fiber sliver S11, so that the core yarn S2's rotation is utilized to wrap the staple fiber sliver S11 around the surface of the core yarn S2; the input distance between the staple fiber sliver S11 and the core yarn S2 in the jaws is 2 to 5 mm. By setting the distance between the wrapping zone 213 and the jaws between the front roller 221 and the front roller 126 to be greater than the fiber length of the staple fiber sliver S11, the core yarn S2's rotation is better utilized to wrap the staple fiber sliver S11 around its outer layer. The high-speed rotation of the core yarn S2 also produces a certain stretching effect on the staple fiber sliver S11, further improving the quality of the core-spun yarn. The core filament S2 and the staple fiber strip S11 are limited to enter the jaws between the front roller 221 and the front roller 126 at a certain distance in order to cooperate with the spacing between the staple fiber channel and the filament channel and the limiting function of the yarn guide module, so that the core filament S2 can merge with the staple fiber layer formed by the staple fiber strip S11 at a certain angle in the wrapping area 213, which is beneficial to the wrapping effect of the staple fiber layer on the core filament S2.

[0055] In this embodiment, the interval between the short fiber channel 211 and the filament channel 212 is 5 mm; the width of the filament channel 212 is 3 mm; the short fiber channel 211 is a channel with equal width along the conveying direction of the short fiber strip S1) and a width of 10 mm; in the core spinning process, the input distance between the short fiber strip S11 and the core filament S2 at the jaws is 5 mm.

[0056] See also Figure 6 As shown, Figure 6 This is a polyester-cotton core-spun yarn spun under 35x 3D microscope magnification using a ring-spun fiber-opening mechanically assisted core-spun spinning device and method; the core yarn material of the core-spun yarn is: 120D blue polyester yarn; the staple fiber sliver material is: 735tex cotton roving; the process parameters are: spindle speed of 8000r / min; twist of 70T / 10cm; front roller linear speed of 11.43m / min; total draft ratio of 82.68; cortical cotton fiber linear density of 8.89tex; and back zone draft of 1.25. Figure 6 The core yarn accounts for 60%.

[0057] Depend on Figure 6 It can be seen that in the polyester-cotton core-spun yarn spun by the ring-spinning open-fiber mechanically assisted core-spun spinning device and method, the outer cotton fiber completely covers the blue polyester core yarn without any exposure; the overall yarn covering effect is good, and the outer covering fiber parallelism is high.

[0058] Comparative Example 1

[0059] This comparative example provides a ring spinning open fiber type mechanical assisted core spinning device and method. Compared with Example 1, the difference is that this device is a conventional ring spinning device, and the method is to gather short fiber strips around the core yarn and twist them to obtain core yarn. The rest is roughly the same as Example 1 and will not be repeated here.

[0060] Figure 7 The core-spun yarn is a polyester-cotton core-spun yarn produced by a conventional ring-spun core-spun yarn method under a 35x 3D microscope magnification. Conventional ring-spun core-spun yarn is a yarn produced by directly gathering and twisting short fiber strands and core yarns. The core-spun auxiliary unit 200 of the present invention is not provided. Figure 7 It can be seen that the polyester-cotton core-spun yarn spun by the ordinary ring spinning method cannot cover the core filaments well when the core filament accounts for 60%, and there is an obvious phenomenon of blue polyester core filaments being exposed, and the yarn quality of the core-spun yarn is poor.

[0061] Comparative Example 2

[0062] This comparative example provides a ring spinning open fiber type mechanical assisted core spinning device and method. Compared with Example 1, the difference is that the short fiber channel 211 and the filament channel 212 are set closely together. The rest is roughly the same as Example 1 and will not be repeated here.

[0063] See also Figure 8 As shown, Figure 8 The polyester-cotton core-spun yarn is spun using a device with no gap between the short fiber channel 211 and the filament channel 212 in comparative example 2 under 35 times 3D microscope magnification, and the core yarn accounts for 60%; Figure 8 It can be seen that the core-spun yarn spun by the device with no gap between the short fiber channel 211 and the filament channel 212 forms an apparent morphology of a plied yarn, in which the blue polyester core yarn is twisted with the outer cotton fiber instead of completely covering the blue polyester core yarn.

[0064] The core-spun yarns prepared in Example 1 and Comparative Examples 1-2 were compared in terms of core yarn ratio, strength, and elongation at break, and the results are shown in the following table.

[0065] Table 1 Comparison of core-spun yarn properties between Example 1 and Comparative Examples 1-2

[0066]

[0067] It can be seen from Table 1 that the core-spun yarn of Example 1 is structurally closer to the core-spun yarn structure under the ideal state. Therefore, the core wire is mainly subjected to force during the stretching process, and the strength is higher; while the core-spun yarn in Comparative Example 1 has the phenomenon of core wire exposure, and the core wire is not in a completely straight state in the yarn body, but is constantly transferred inward and outward. Therefore, during the stretching process, the core wire and the staple fiber are jointly subjected to force, and the core wire is subjected to the shear force generated by the stretching of the staple fiber, so the strength is lower, and the breaking non-simultaneity is larger, and the standard deviation is higher; the core-spun yarn in Comparative Example 2 completely presents the appearance of a twisted yarn, and during the stretching process, the core wire and the staple fiber are jointly subjected to force, and the core wire and the staple fiber are twisted together, and the strength and breaking elongation are lower than those in Example 1, and the standard deviation is lower.

[0068] In summary, the present invention provides a ring spinning open fiber type mechanical assisted core spinning device and method, the device includes a feeding unit, a core wrapping auxiliary unit and a yarn winding unit; the core wrapping auxiliary unit includes an auxiliary core wrapping module, a roller pressure module for applying pressure to the auxiliary core wrapping module and a yarn guide module. The core wrapping spinning device of the present invention is provided with an auxiliary core wrapping module with a special structure, so that the staple fiber strands form a staple fiber layer with a certain width and uniform structure in the staple fiber channel; and in conjunction with the feeding unit, other modules of the core wrapping auxiliary unit and the yarn winding unit, the staple fiber layer is tightly wrapped around the core filament, and a core-spun yarn with a good covering effect and a relatively large proportion of core filaments is obtained, so as to maximize the utilization of staple fibers and reduce the raw material cost of the core-spun yarn; and solves the problem that the core-spun yarn on the ring spinning machine is prone to core exposure and the proportion of core filaments is not large. The present invention forms a wider staple layer from staple fiber strips first and then covers the core filaments, thereby increasing the core filament ratio of the core-spun yarn, saving the amount of coarse yarn and reducing the preparation cost of the core-spun yarn; and the core-spun spinning device has low modification cost, a wide range of applications, and good industrial application prospects and value.

[0069] 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 ring spinning fiber-opening mechanically assisted core-spun spinning device, characterized in that: The invention comprises a feeding unit, a core-spinning auxiliary unit and a yarn winding unit; the feeding unit comprises a core-spinning feeding mechanism for feeding core filaments, and a staple drafting feeding mechanism for drafting roving into staple strands and feeding the staple strands into the core-spinning auxiliary unit; the core-spinning auxiliary unit comprises an auxiliary core-spinning module, a roller pressure module for applying pressure to the auxiliary core-spinning module, and a yarn guide module, wherein the yarn guide module is arranged between the auxiliary core-spinning module and the yarn winding unit; a staple fiber channel and a filament channel are provided inside the auxiliary core-spinning module at a certain distance from each other, and the width of the staple fiber channel is 5 to 10 mm; A negative pressure suction component is provided inside the auxiliary core wrapping module, and a plurality of uniform grid holes are provided on the surface of the short fiber channel facing the negative pressure suction component. The short fiber strands in the short fiber channel are adsorbed by the negative pressure suction component through the grid holes, so that the short fiber strands are spread flat on the inner surface of the short fiber channel to form a short fiber layer with uniform structure.

2. The ring spinning fiber-opening mechanically assisted core-spun spinning device according to claim 1, characterized in that: The staple fiber channel is a channel of equal width along the conveying direction of the staple fiber strands, or a channel with a shape that gradually widens from narrow to wide, so as to avoid the staple fiber strands from generating agglomerating force on the staple fiber strands and causing the staple fiber strands to form a staple fiber layer with a certain width therein; when the staple fiber channel is a channel with a shape that gradually widens from narrow to wide, the width of the narrow channel opening is 5 to 7 mm.

3. The ring spinning fiber-opening mechanically assisted core-spun spinning device according to claim 1, characterized in that: The interval between the short fiber channel and the long fiber channel is 2-5 mm; the width of the long fiber channel is 3-5 mm.

4. The ring spinning fiber-opening mechanically assisted core-spun spinning device according to claim 1, characterized in that: The yarn guiding module includes a yarn guiding rod and a heating groove arranged on the yarn guiding rod; the position of the heating groove on the yarn guiding rod is opposite to the output port of the short fiber channel, so that the short fiber strands are output from the short fiber channel in a straight line, and the core wire is output from the filament channel in a broken line and offset toward the short fiber strands, and the core wire and the short fiber strands meet in the wrapping area at a certain angle; the temperature of the heating groove is 100~200℃.

5. The ring spinning fiber-opening mechanically assisted core-spun spinning device according to claim 1, characterized in that: The staple 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 feeding and drafting direction of the roving; the front roller is arranged in contact with the auxiliary core-wrapping module.

6. The ring spinning fiber-opening mechanically assisted core-spun spinning device according to claim 5, characterized in that: The roller pressure module includes a front roller and a bridge component connecting the front roller and the auxiliary core-wrapping module; the front roller and the front roller are arranged opposite to each other, and a jaw is formed between the two, and the staple fiber strands and the core yarn are output from the jaw and enter the auxiliary core-wrapping module; the bridge component applies pressure to the auxiliary core-wrapping module so that its inner side is attached to the surface of the front roller.

7. The ring spinning fiber-opening mechanically assisted core-spun spinning device according to claim 6, characterized in that: The core yarn feeding unit includes a guide wheel for changing the angle of the core yarn; the core yarn is guided by the guide wheel and input into the filament channel from the nip between the front roller and the front roller at a certain angle, and after output, it merges with the staple fiber strips output from the staple fiber channel in the wrapping area at a certain angle, and the rotation of the core yarn drives the staple fiber strips to wrap around the outer layer of the core yarn to form a core-spun yarn.

8. A ring spinning open fiber type mechanical assisted core spinning method, characterized in that: The core-spun yarn is prepared by using the ring spinning open fiber type mechanically assisted core-spun spinning device according to any one of claims 1 to 7, and the specific method is: The staple fiber drafting and feeding mechanism drafts the roving into staple fiber strands, and conveys the staple fiber strands into the staple fiber channel of the auxiliary core-spun module through the nip between the front top roller and the front roller. The staple fiber strands form a staple fiber layer in the staple fiber channel, and the staple fiber layer is output from the staple fiber channel and conveyed forward along the operation of the front roller. At the same time, the core yarn is guided by the godet and input into the filament channel of the auxiliary core-spun module from the nip between the front top roller and the front roller at a certain angle. After output, it merges with the staple fiber layer on the surface of the front roller in the wrapping area at a certain angle. The rotation of the core yarn drives the staple fiber layer to wrap around the outer layer of the core yarn to form a core-spun yarn. The core-spun yarn passes through the heating groove on the yarn guide rod to achieve the positioning of the yarn path and eliminate the lateral movement of the yarn caused by airflow; the yarn guide rod transports the core-spun yarn to the yarn guide hook of the yarn winding unit, and the steel wire ring rotating at high speed on the guide plate is wound on the yarn tube to complete the core-spun spinning process.

9. The ring spinning fiber-opening mechanically assisted core-spun spinning method according to claim 8, characterized in that: The distance between the wrapping area and the jaws is greater than the fiber length of the staple fiber strands, so that the staple fiber strands can be wrapped around the surface of the core wire by utilizing the rotation of the core wire; the input distance between the staple fiber strands and the core wire in the jaws is 2 to 5 mm.

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