Spinning device for reinforcing yarns

Abstract

The application discloses a spinning device for enhancing the strength of yarn, which applies force to the fibers of the middle part of the short fiber sliver between the drafting mechanism and the twisting triangle area in the ring spinning process, so that the stressed fibers are transferred to the inside of the short fiber sliver and interpenetrate and entangle with other fibers in the process of transfer. The force is continuous force, and the force is applied by airflow blowing. Alternatively, the force is intermittent force, and the force is applied by needling. The interval time of the intermittent force is 0.5-2.5s. The method is simple, and can obviously improve the strength, breaking production rate and other indexes of the yarn, and improve the utilization rate of the strength of the yarn in the yarn.

Description

Technical Field

[0001] This invention belongs to the field of spinning technology and relates to a spinning device for enhancing yarn strength. This invention is a divisional application filed on May 31, 2023, with application number "2023106293749" and titled "A spinning method for enhancing yarn strength". Background Technology

[0002] When evaluating yarn quality, breaking strength is the primary indicator among all intrinsic properties. Yarn strength directly affects spinning efficiency, yarn finishing, weaving, weaving and finishing processes, and the durability of the fabric. Many factors influence yarn strength, including raw material properties (fiber length, linear density, maturity, and strength, etc.), spinning process, yarn structure (fiber straightness, parallelism, and arrangement and distribution in the yarn, yarn twist, etc.), and yarn evenness (weight unevenness, twist unevenness, etc.).

[0003] Studies have shown that the actual strength utilization rate of fine yarn (yarn strength / fiber strength) is approximately 50%. According to literature, for pure yarn, the fiber strength utilization rate ranges from 45% to 64%. This low fiber strength utilization rate is due to uneven yarn fineness and uneven fiber breaking elongation, with the yarn breaking elongation being significantly lower than the fiber breaking elongation. For polyester-cotton blended yarns, the breaking elongation is usually due to the low breaking elongation of cotton fibers rather than the difference in breaking elongation of polyester fibers. Due to the low friction between fibers, in blended yarns, only 35% of the broken polyester fibers contribute to the yarn strength. Yarn breakage begins with the breakage of cotton fibers. When some fibers break, cracks form, and the broken fibers can no longer be controlled, leading to slippage between fibers and ultimately, rapid yarn breakage.

[0004] When ring-spun yarn is twisted, the outer fibers shift towards the yarn beam, creating a certain twist. The greater the twist, the greater the friction between the fibers, resulting in higher yarn strength. Therefore, increasing yarn twist is a crucial method for improving yarn strength. However, excessive twist leads to severe shrinkage, negatively impacting weaving quality. Consequently, in actual production, yarn twist is typically controlled within a reasonable range.

[0005] The structure of yarn is relatively complex. A simplified description using a yarn geometric model is used to determine the arrangement of fibers in the cross-section and their distribution along the axial direction. Most descriptions of yarn geometry generally define the yarn structure as consisting of a large number of fibers of a certain length, with uniform fiber stacking, a circular cross-section, coaxial helical fiber paths, and minimal transverse stress between fibers perpendicular to the yarn axis. Due to the specific geometric model of ring-spun yarn, the only pressure between fibers within the yarn is generated by fiber transfer during twisting. Therefore, when the yarn breaks, the interaction between fibers is purely frictional, resulting in a lower utilization rate of yarn strength. Summary of the Invention

[0006] The purpose of this invention is to solve the problems existing in the prior art and to provide a spinning method that enhances yarn strength.

[0007] To achieve the above objectives, the present invention adopts the following solution:

[0008] A spinning method to enhance yarn strength involves applying force to the fibers in the middle part of the unheld short fiber sliver (in a free state) located between the drafting mechanism and the twisting triangle zone during ring spinning. This causes the stressed fibers to transfer into the interior of the short fiber sliver and interweave and entangle with other fibers during the transfer process.

[0009] After being drafted on a ring spinning machine, the untwisted short fiber sliver forms a flat ribbon under the action of rollers and skin rollers. When a certain force is applied to some of the fibers, because fibers are flexible materials, the stressed fibers will bend and transfer. During the bending and transfer process, they will interweave and entangle with other fibers, changing the original parallel arrangement of all fibers in the untwisted short fiber sliver to a state in which some fibers within the short fiber sliver are entangled. After twisting, the entangled fibers still exist inside the yarn. The geometric structure of the yarn changes compared to existing ring-spun yarn. When the yarn is stretched and breaks, in addition to overcoming the friction between fibers and the breaking strength of some fibers, it is also necessary to overcome the force generated by fiber entanglement, thereby improving the strength utilization rate of the yarn.

[0010] The force is applied to a portion of the fibers in the short fiber sliver. The purpose is to ensure that after twisting, the entangled fibers remain within the yarn body, without affecting the surface structure of the ring-spun yarn. This prevents impact on other quality indicators of the yarn besides breaking strength and elongation at break. A schematic diagram of the cross-sectional structure of the short fiber sliver is shown below. Figure 5 As shown.

[0011] As a preferred technical solution:

[0012] As described above, in a spinning method to enhance yarn strength, the direction of the force is downward, and the angle between the force and the horizontal plane is 60~90°. Taking the running direction of the short fiber sliver as the front-back direction, part of the force is vertically downward, part of the force is inclined downward and inclined to the left, and another part of the force is inclined downward and inclined to the right.

[0013] As described above, the spinning method for enhancing yarn strength involves a continuous force applied by airflow. This continuous force causes the fibers to become continuously entangled within the yarn. The corresponding spinning device for enhancing yarn strength is denoted as spinning device A.

[0014] Alternatively, the force can be intermittent, applied by needle punching, with an interval of 0.5 to 2.5 seconds. The intermittent force causes the fibers to become intermittently entangled within the yarn. When the force is applied intermittently, the interval is related to the spacing of the entangled segments. The spacing of the entangled segments must be less than the main length of the fiber; otherwise, the spun yarn is prone to weak points. The corresponding spinning device that enhances the yarn strength is denoted as spinning device B.

[0015] As described above, in a spinning method for enhancing yarn strength, when the applied force is a continuous force and the force is applied by airflow blowing, the airflow pressure blowing onto the short fiber sliver is 100~350Pa.

[0016] When the force is intermittent and the force is applied by needle pricking, with an interval of 0.05 to 0.25 seconds, the frequency of needle pricking is 4 to 20 times per second, and the depth of needle penetration into the short fiber sliver is 1 to 2 mm.

[0017] As described above, in a spinning method for enhancing yarn strength, when the applied force is a continuous force and the force is applied by airflow sweeping, the number of fibers in the short fiber sliver is 300-500, and the main body length is 25-38 mm; the running speed of the short fiber sliver is 10-30 m / min; the width of the fibers in the middle part of the short fiber sliver is 30-60% of the width of the short fiber sliver; the final yarn has a twist of 380-750 twists / m and a breaking strength of 17.8-20.5 cN / tex, which is 5-8% higher than that of the control sample yarn (basically the same as this invention, except that the control sample does not apply force to the fibers in the middle part of the unheld short fiber sliver located between the drafting mechanism and the twisting triangle).

[0018] When the applied force is intermittent, and the method of application is needle punching, with an interval of 0.05~0.25s, the number of fibers in the short fiber sliver is 300~500, and the main body length is 25~38mm; the running speed of the short fiber sliver is 10~30m / min; the width of the fibers in the middle part of the short fiber sliver is 30~60% of the width of the short fiber sliver; the twist of the final yarn is 380~750 twists / m, and the breaking strength is 17.5~20cN / tex. Compared to the control sample yarn (which is basically the same as this invention, except that the control sample did not apply force to the fibers in the middle part of the unheld short fiber sliver located between the drafting mechanism and the twisting triangle zone; a schematic diagram of the cross-sectional structure of the short fiber sliver is shown below),... Figure 4 The fracture strength (as shown) increased by 3-5%.

[0019] The structures of spinning devices A and B are not limited, as long as they can apply a specific type of force to the short fiber sliver in a specific manner. Here are some examples of the possible structures of spinning devices A and B.

[0020] A spinning device for enhancing yarn strength (i.e., spinning device A) includes a front roller, a front slip roller, an output roller, an output slip roller, an airflow device, an air supply device, and a web support device;

[0021] The central axes of the front roller, front taper roller, output roller, and output taper roller are all parallel to the left-right direction; the output roller is located in front of the front roller, and the two are spaced apart; the output taper roller is located directly above the output roller, and the front taper roller is located directly above the front roller.

[0022] The airflow device and the fiber web support device are located between the front roller and the output roller, with the airflow device located above the fiber web support device.

[0023] The airflow device includes a roller connector, an air duct, and an air chamber; the air duct and the air chamber are interconnected; a fiber guide groove is provided on the outer bottom surface of the air chamber, which is parallel to the front-back direction and penetrates the air chamber; the bottom of the air chamber has m sets of injection holes, where m ≥ 1, the upper ends of the m sets of injection holes intersect with the inner bottom surface of the air chamber to form m rows of inlets, each row of inlets being parallel to the left-right direction; the lower ends of the m sets of injection holes intersect with the bottom of the fiber guide groove to form m outlets, the m outlets being located on the bottom of the fiber guide groove and arranged at intervals along the front-back direction; the m rows of inlets correspond one-to-one with the m outlets, each row of inlets is connected to its corresponding outlet, and a portion of each row of inlets is located directly above its corresponding outlet, a portion is located to the upper left of its corresponding outlet, and another portion is located to the upper right of its corresponding outlet; the roller connector connects the air chamber to the front roller.

[0024] The number of airflow devices is n, where n≥1, and the value of n is the same as the number of spindles on one side of the ring spinning machine; when p>1, all airflow devices are arranged with spacing in the left-right direction;

[0025] The air supply device is connected to the air pipe and is used to introduce airflow with a pressure of 600~800Pa into the air pipe. The number of air supply devices can be the same as the number of air pipes, in which case the air pipes and air supply devices are connected in a one-to-one correspondence. Alternatively, there can be only one air supply device, in which case all air pipes are connected to the air supply device at the same time.

[0026] The fiber web support device serves two purposes: first, to support the fiber movement, preventing it from falling or slipping after being released from the control of the front roller; and second, to work in conjunction with the fiber guide grooves to guide the short fiber slivers forward along the direction of the guide grooves. The fiber web support device includes a support plate, n mesh rings for supporting the fibers, and a drive shaft. The upper surface of the support plate has p grooves, which are parallel to the front-to-back direction and penetrate the support plate. The p grooves and the n fiber guide grooves correspond one-to-one, forming n "U"-shaped channels, which are used to guide the short fiber slivers forward. The drive shaft is parallel to the left-to-right direction, located behind the support plate, and also below the sides of the grooves. The drive shaft rotates in the same direction as the front roller. The n mesh rings are simultaneously fitted onto the support plate and the drive shaft, and each of the n mesh rings covers one of the p grooves.

[0027] The ring spinning frame has a symmetrical structure on both sides. By modifying the structure on both sides of the ring spinning frame, two spinning devices A can be obtained.

[0028] As a preferred technical solution:

[0029] In the spinning device for enhancing yarn strength described above, the ratio of the linear speed of the front roller to the output roller is 1:1 to 1.05.

[0030] As described above, in a spinning device for enhancing yarn strength, the bottom of the fiber guide groove is rectangular, and m outlets are located on the axis of symmetry of the bottom of the fiber guide groove, parallel to the front-back direction.

[0031] As described above, in a spinning device for enhancing yarn strength, the injection orifice is a tapered through-hole with its size decreasing from top to bottom.

[0032] As described above, a spinning device for enhancing yarn strength has 8 to 10 rows of inlets, with 5 to 7 inlets in each row; the inlets are circular with a diameter of 0.3 to 0.5 mm, the outlets are circular with a diameter of 0.1 to 0.2 mm, the spacing between adjacent rows of inlets is 2.5 to 3.5 mm, and the center distance between adjacent inlets in each row is 0.65 to 1.36 mm; the width of the fiber guide groove in the left-right direction is 4 to 6 mm.

[0033] As described above, in a spinning device for enhancing yarn strength, the spacing between any two adjacent rows of inlets is the same, and the center distance between any two adjacent inlets in any row is the same.

[0034] As described above, in a spinning device for enhancing yarn strength, r is an odd number, with one of the inlets located directly above its corresponding outlet, (r-1) / 2 located to the upper left of its corresponding outlet, and (r-1) / 2 located to the upper right of its corresponding outlet.

[0035] As described above, a spinning device for enhancing yarn strength, where n is an even number, further includes n / 2 air chamber connecting parts; along the left-right direction, the air chamber of the i-th airflow device is connected to the air chamber of the (i+1)-th airflow device through an air chamber connecting part, where i is any odd number in [1, n].

[0036] As described above, in a spinning device for enhancing yarn strength, the drive shaft is connected to the front roller drive, so that the linear speed of the mesh ring is the same as that of the front roller, allowing the short fiber sliver to advance at the same speed without causing congestion or unexpected stretching. When the speed of the mesh ring is less than the speed of the front roller, the fibers output by the front roller will cause congestion on the mesh ring. When the speed of the mesh ring is greater than the speed of the front roller, it will cause unexpected stretching of the short fiber sliver, affecting the quality.

[0037] A spinning device for enhancing yarn strength (i.e., spinning device B) includes a front roller, a front slip roller, an output roller, an output slip roller, a needle punching device, and a web support device;

[0038] The central axes of the front roller, front taper roller, output roller, and output taper roller are all parallel to the left-right direction; the output roller is located in front of the front roller, and the two are spaced apart; the output taper roller is located directly above the output roller, and the front taper roller is located directly above the front roller.

[0039] The needle punching device and the fiber web support device are located between the front roller and the output roller, with the needle punching device located above the fiber web support device.

[0040] The needle-punching device includes a crossbeam, a needle plate, needles, and a reciprocating motion mechanism. The crossbeam is placed horizontally and perpendicular to the running direction of the short fiber sliver. The needles are vertically mounted on the lower surface of the crossbeam via the needle plate. The reciprocating motion mechanism drives the crossbeam to move up and down. As the crossbeam moves up and down, the needles act on the short fiber sliver. The fibers acted on by the needles will interpenetrate and entangle with each other. There are m rows of needles, where m ≥ 1. Each row of needles is parallel to the left and right directions. In each row, some needles are vertically downward, some are inclined downward with the inclination direction to the left, and another part is inclined downward with the inclination direction to the right.

[0041] The function of the fiber web support device is to support the fiber movement, preventing the fiber from falling or slipping after it is released from the control of the front roller. The fiber web support device includes a support plate, n mesh rings for supporting the fiber, and a drive shaft, where n ≥ 1, and the value of n is the same as the number of spindles on one side of the ring spinning machine. The upper surface of the support plate has p grooves, which are parallel to the front-to-back direction and penetrate the support plate. When p > 1, all the grooves are arranged at intervals along the left-to-right direction. The drive shaft is parallel to the left-to-right direction, located behind the support plate, and also below the grooves. The drive shaft rotates in the same direction as the front roller. All n mesh rings are simultaneously fitted onto the support plate and the drive shaft, and each of the n mesh rings covers one of the p grooves.

[0042] The ring spinning frame has a symmetrical structure on both sides. By modifying the structure on both sides of the ring spinning frame, two spinning devices B can be obtained.

[0043] As a preferred technical solution:

[0044] In the spinning device for enhancing yarn strength described above, the ratio of the linear speed of the front roller to the output roller is 1:1 to 1.05.

[0045] As described above, a spinning device for enhancing yarn strength has 8 to 10 rows of needles, with 5 to 7 needles in each row; the distance between two adjacent rows of needles is 2.5 to 3.5 mm, the center distance between the upper ends of two adjacent needles in each row is 0.5 to 1 mm, and the center distance between the lower ends of two adjacent needles in each row is 0.3 to 0.5 mm.

[0046] As described above, in a spinning device for enhancing yarn strength, the spacing between any two adjacent rows of needles is the same, and the center distance between the lower ends of any two adjacent needles in any row is the same.

[0047] As described above, in a spinning device for enhancing yarn strength, r is an odd number, one of the rows of needles is vertically downward, (r-1) / 2 are tilted downward with the tilt direction to the left, and (r-1) / 2 are tilted downward with the tilt direction to the right.

[0048] As described above, a spinning device for enhancing yarn strength includes a reciprocating motion mechanism comprising a drive shaft, a cam, a driven wheel, a support rod, a limiting mechanism, and a connecting member. The drive shaft is parallel to the crossbeam and is connected to the output roller. The cam is fixedly sleeved on the drive shaft and eccentrically connected to it. The driven wheel is located above the cam, and the two are in circumferential contact. The support rod is arranged vertically and its lower end is fixedly connected to the driven wheel. The limiting mechanism restricts the support rod to move only in the vertical direction. The connecting member fixes the support rod and the crossbeam together.

[0049] As described above, in a spinning device for enhancing yarn strength, the drive shaft is connected to the output roller via a gearbox.

[0050] As described above, in a spinning device for enhancing yarn strength, the drive shaft is connected to the front roller drive, so that the linear speed of the mesh ring is the same as that of the front roller, allowing the short fiber sliver to advance at the same speed without causing congestion or unexpected stretching. When the speed of the mesh ring is less than the speed of the front roller, the fibers output by the front roller will cause congestion on the mesh ring. When the speed of the mesh ring is greater than the speed of the front roller, it will cause unexpected stretching of the short fiber sliver, affecting the quality.

[0051] Beneficial effects

[0052] The spinning method of the present invention allows some fibers to interweave, entangle, and knot within the yarn, enhancing the bonding effect of fibers within the yarn. When the yarn breaks due to stretching, it is necessary not only to overcome the frictional force between fibers and the breaking strength of some fibers, but also to overcome the entanglement force between fibers. This significantly improves the yarn's strength, breaking productivity, and other indicators, thereby increasing the utilization rate of yarn strength. Attached Figure Description

[0053] Figure 1 This is a schematic diagram of the intermittent forces acting on the middle portion of the short fiber sliver of the present invention;

[0054] Figure 2 This is a schematic diagram of the continuous force acting on the middle portion of the short fiber sliver of the present invention;

[0055] Figure 3 This is a schematic diagram illustrating the force principle of short fiber slivers in the device of the present invention;

[0056] Figure 4 A schematic diagram of the cross-sectional structure of short fiber slivers spun by traditional ring spinning;

[0057] Figure 5 This is a schematic diagram of the cross-sectional structure of the short fiber sliver spun in this invention;

[0058] Figure 6 This is a schematic diagram of the structure of the spinning apparatus A of the present invention;

[0059] Figures 7-8 This is a schematic diagram of the overall structure of the device of the present invention after the two airflow devices are connected by an air chamber connection part;

[0060] Figure 9 for Figure 7 A schematic diagram showing the arrangement of the injection holes at the bottom of the two air chambers;

[0061] Figure 10 for Figure 7 A schematic diagram of the cross-sectional structure along the left and right directions;

[0062] Figure 11This is a schematic diagram of the structure of the support plate containing two grooves in the device of the present invention;

[0063] Figure 12 This is a schematic diagram showing the cooperation between a support plate with two grooves and two airflow devices in the device of the present invention.

[0064] Figure 13 This is a schematic diagram of the fiber mesh support device in the apparatus of the present invention (for ease of understanding, a mesh ring on the right side is omitted in the figure);

[0065] Figure 14 This is a schematic diagram of the structure of the spinning apparatus B of the present invention;

[0066] Figure 15 This is a schematic diagram of the needle-piercing mechanism of the present invention;

[0067] Among them, 1-output roller, 2-front roller, 3-airflow device, 4-front leather roller, 5-ventilation pipe, 6-air chamber, 7-output leather roller, 8-fiber guide groove, 9-leather roller connecting part, 10-mesh ring, 11-support plate, 12-drive shaft I, 13-groove, 14-jet hole, 15-needle, 16-needle plate, 17-crossbeam, 18-cam, 19-driven wheel, 20-support rod, 21-drive shaft II, 22-limiting mechanism, 23-gearbox. Detailed Implementation

[0068] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0069] The definition of directional terminology in Examples 1 and 2: based on Appendix Figure 6 Or attached Figure 14 The direction of movement from the front roller 2 to the output roller 1 (i.e. the direction of movement of the short fiber sliver) is taken as the front, and the left and right are horizontal and perpendicular to the above-mentioned direction of movement.

[0070] Example 1

[0071] A spinning device for enhancing yarn strength (i.e., spinning device A), such as Figures 6-13 As shown, it includes a front roller 2, a front skin roller 4, an output roller 1, an output skin roller 7, an airflow device 3, an air supply device, a fiber web support device, and an air chamber connection part;

[0072] The number of airflow devices 3 is n, where n is an even number greater than 1, and all airflow devices 3 are arranged at intervals along the left-right direction; for example Figures 7-8As shown, each airflow device 3 includes a roller connector 9, an air pipe 5, and an air chamber 6;

[0073] In each airflow device 3, the air pipe 5 and the air chamber 6 are connected to each other; a fiber guide groove 8 with a rectangular bottom is provided on the outer bottom surface of the air chamber 6. The fiber guide groove 8 is parallel to the front-back direction and passes through the air chamber 6. The width of the fiber guide groove 8 in the left-right direction is 4~6mm.

[0074] like Figures 9-10 As shown, in each airflow device 3, the bottom of the air chamber 6 is provided with m sets of injection holes 14, where m is 8 or 10. Each injection hole 14 is a tapered through hole with decreasing size from top to bottom. The upper ends of the m sets of injection holes 14 intersect with the inner bottom surface of the air chamber 6 to form m rows of inlets. Each row of inlets is parallel to the left and right direction. The distance d1 between any two adjacent rows of inlets is the same, where d1 is 2.5~3.5mm. In each row, the inlet is circular with a diameter of 0.3~0.5mm. The number of inlets r is 5 or 7. One inlet is located directly above its corresponding outlet, (r-1) / 2 inlets are located to the upper left of its corresponding outlet, and (r-1) / 2 inlets are located to the upper right of its corresponding outlet. The center distance d2 between any two adjacent inlets is the same, where d2 is 0.65~1.36mm.

[0075] The lower ends of the m groups of injection holes 14 intersect with the bottom of the fiber guide groove 8 to form m outlets. The m outlets are located on the axis of symmetry parallel to the front-back direction at the bottom of the fiber guide groove 8 and are arranged at intervals along the front-back direction. The outlets are circular and have a diameter of 0.1~0.2mm. The m rows of inlets correspond one-to-one with the m outlets, and each row of inlets is connected to its corresponding outlet.

[0076] The roller connecting part 9 connects the air chamber 6 to the front roller 4;

[0077] like Figure 13 As shown, the fiber web support device includes a mesh ring 10, a support plate 11, and a drive shaft I 12;

[0078] The upper surface of the support plate 11 is provided with p grooves 13, which are parallel to the front-to-back direction and penetrate the support plate 11. The p grooves 13 correspond one-to-one with n fiber guide grooves 8, forming n "convex" shaped channels. The "convex" shaped channels are used to guide the short fiber slivers forward. The drive shaft I 12 is parallel to the left-to-right direction, located behind the support plate 11, and also located below the side of the grooves 13. The drive shaft I 12 is connected to the front roller 2 and rotates in the same direction. There are n mesh rings 10, which are all simultaneously fitted on the support plate 11 and the drive shaft I 12. The n mesh rings 10 cover the p grooves 13 respectively. Figure 11 The image shows support plate 11 when n=2;

[0079] The number of air chamber connection parts is n / 2; along the left and right direction, the air chamber 6 of the i-th airflow device 3 is connected to the air chamber 6 of the (i+1)-th airflow device 3 through an air chamber connection part, where i is any odd number in [1, n].

[0080] like Figure 6 As shown, the central axes of the front roller 2, front slip roller 4, output roller 1, and output slip roller 7 are all parallel to the left-right direction; the output roller 1 is located in front of the front roller 2, and the two are spaced apart; the output slip roller 7 is located directly above the output roller 1, and the front slip roller 4 is located directly above the front roller 2; the ratio of the linear velocities of the front roller 2 and the output roller 1 is 1:1 to 1.05; the airflow device 3 and the web support device are located between the front roller 2 and the output roller 1, and the airflow device 3 is located above the web support device; the air supply device is connected to the air pipe 5 and is used to introduce airflow with a pressure of 600 to 800 Pa into the air pipe 5.

[0081] Example 2

[0082] A spinning device for enhancing yarn strength (i.e., spinning device B), such as Figures 14-15 As shown, it includes a front roller 2, a front skin roller 4, an output roller 1, an output skin roller 7, a needle punching device, and a fiber web support device;

[0083] like Figure 15 As shown, the acupuncture device includes a crossbeam 17, a needle plate 16, a needle 15, and an up-and-down reciprocating motion mechanism.

[0084] The crossbeam 17 is placed horizontally and perpendicular to the running direction of the short fiber sliver;

[0085] There are m rows of needles 15, where m is 8 to 10. Each row of needles 15 is parallel to the left and right direction. The distance d3 between any two adjacent rows of needles 15 is the same, and d3 is 2.5 to 3.5 mm. The number r of needles 15 in each row is 5 or 7. In each row, one needle is vertically downward, (r-1) / 2 needles are tilted downward and tilted to the left, and (r-1) / 2 needles are tilted downward and tilted to the right. The center distance d4 between the upper ends of any two adjacent needles 15 is the same, and d4 is 0.5 to 1 mm. The center distance d5 between the lower ends of any two adjacent needles 15 is the same, and d5 is 0.3 to 0.5 mm.

[0086] The reciprocating motion mechanism includes a drive shaft II 21, a cam 18, a driven wheel 19, a support rod 20, a limiting mechanism 22, and a connecting member. The drive shaft II 21 is parallel to the crossbeam 17 and is connected to the output roller 1 via a gearbox 23. The cam 18 is fixedly sleeved on the drive shaft II 21 and eccentrically connected to it. The driven wheel 19 is located above the cam 18, and the two are in circumferential contact. The support rod 20 is arranged vertically and its lower end is fixedly connected to the driven wheel 19. The limiting mechanism 22 restricts the support rod 20 to move only in the vertical direction. The connecting member fixes the support rod 20 and the crossbeam 17 together.

[0087] The needle 15 is vertically mounted on the lower surface of the crossbeam 17 via the needle plate 16;

[0088] The fiber web support device includes a support plate 11, n mesh rings 10, and a drive shaft I 12, where n ≥ 1. The upper surface of the support plate 11 is provided with p grooves 13, which are parallel to the front-back direction and penetrate the support plate 11. When p > 1, all the grooves 13 are arranged at intervals along the left-right direction. The drive shaft I 12 is parallel to the left-right direction, located behind the support plate 11, and also located below the side of the grooves 13. The drive shaft I 12 is connected to the front roller 2 and rotates in the same direction. The n mesh rings 10 are all simultaneously fitted onto the support plate 11 and the drive shaft I 12, and the n mesh rings 10 respectively cover the p grooves 13.

[0089] like Figure 1 As shown, the central axes of the front roller 2, front slip roller 4, output roller 1, and output slip roller 7 are all parallel to the left-right direction; the output roller 1 is located in front of the front roller 2, and the two are spaced apart; the output slip roller 7 is located directly above the output roller 1, and the front slip roller 4 is located directly above the front roller 2; the ratio of the linear velocity of the front roller 2 to the output roller 1 is 1:1 to 1.05; the needle punching device and the web support device are located between the front roller 2 and the output roller 1, and the needle punching device is located above the web support device.

[0090] Example 3

[0091] A spinning method for enhancing yarn strength, using the spinning device for enhancing yarn strength as described in Example 1, wherein n is an even number greater than 1, the width of the fiber guide groove in the left-right direction is 4 mm, m is 8, the diameter of the inlet is 0.3 mm, the number of inlets r is 5, d1 is 2.5 mm, d2 is 0.65~0.76 mm, the diameter of the outlet is 0.1 mm, and the ratio of the linear speed of the front roller to the output roller is 1:1;

[0092] The specific operation is as follows: During ring spinning, a continuous downward force is applied to the fibers in the middle portion of the unheld short fiber sliver located between the drafting mechanism and the twisting triangle zone (e.g., ...). Figure 2As shown), the angle between the force and the horizontal plane is 60~90°; Figure 3 As shown, with the running direction of the short fiber sliver as the front-to-back direction, part of the force is vertically downward, part is inclined downward and to the left, and another part is inclined downward and to the right; the airflow pressure blowing onto the short fiber sliver is 100 Pa, the number of fibers in the short fiber sliver is 300, the main body length is 25 mm, and the running speed of the short fiber sliver is 10 m / min; the width of the fibers in the middle part of the short fiber sliver is 30% of the width of the short fiber sliver.

[0093] The final yarn has a twist of 550 twists / m and a breaking strength (test method refers to GB / T 3916-1997, the same below) of 17.5 cN / tex.

[0094] Example 4

[0095] A spinning method for enhancing yarn strength, using the spinning device for enhancing yarn strength as described in Example 1, wherein n is an even number greater than 1, the width of the fiber guide groove in the left-right direction is 5 mm, m is 8, the diameter of the inlet is 0.4 mm, the number of inlets r is 5, d1 is 3.5 mm, d2 is 1.21~1.36 mm, the diameter of the outlet is 0.15 mm, and the ratio of the linear speed of the front roller to the output roller is 1:1.01;

[0096] The specific operation is as follows: During ring spinning, a continuous downward force is applied to the fibers in the middle portion of the unheld short fiber sliver located between the drafting mechanism and the twisting triangle zone (e.g., ...). Figure 2 As shown), the angle between the force and the horizontal plane is 60~90°; Figure 3 As shown, with the running direction of the short fiber sliver as the front-to-back direction, part of the force is vertically downward, part is inclined downward and to the left, and another part is inclined downward and to the right; the airflow pressure blowing onto the short fiber sliver is 350 Pa, the number of fibers in the short fiber sliver is 400, the main body length is 32 mm, and the running speed of the short fiber sliver is 15 m / min; the width of the fibers in the middle part of the short fiber sliver is 50% of the width of the short fiber sliver.

[0097] The final yarn has a twist of 400 twists / m and a breaking strength of 19.8 cN / tex.

[0098] Example 5

[0099] A spinning method for enhancing yarn strength, using the spinning device for enhancing yarn strength as described in Example 1, wherein n is an even number greater than 1, the width of the fiber guide groove in the left-right direction is 6 mm, m is 8, the diameter of the inlet is 0.5 mm, the number of inlets r is 7, d1 is 3 mm, d2 is 1.21~1.36 mm, the diameter of the outlet is 0.2 mm, and the ratio of the linear speed of the front roller to the output roller is 1:1.03;

[0100] The specific operation is as follows: During ring spinning, a continuous downward force is applied to the fibers in the middle portion of the unheld short fiber sliver located between the drafting mechanism and the twisting triangle zone (e.g., ...). Figure 2 As shown), the angle between the force and the horizontal plane is 60~90°; Figure 3 As shown, with the running direction of the short fiber sliver as the front-to-back direction, part of the force is vertically downward, part is inclined downward and to the left, and another part is inclined downward and to the right; the airflow pressure blowing onto the short fiber sliver is 200 Pa, the number of fibers in the short fiber sliver is 350, the main body length is 38 mm, and the running speed of the short fiber sliver is 20 m / min; the width of the fibers in the middle part of the short fiber sliver is 60% of the width of the short fiber sliver.

[0101] The final yarn has a twist of 450 twists / m and a breaking strength of 20.5 cN / tex.

[0102] Example 6

[0103] A spinning method for enhancing yarn strength, using a spinning device for enhancing yarn strength as described in Example 1, wherein n is an even number greater than 1, the width of the fiber guide groove in the left-right direction is 6 mm, m is 10, the diameter of the inlet is 0.3 mm, the number of inlets r is 7, d1 is 2.6 mm, d2 is 0.65~0.72 mm, the diameter of the outlet is 0.1 mm, and the ratio of the linear speed of the front roller to the output roller is 1:1.05;

[0104] The specific operation is as follows: During ring spinning, a continuous downward force is applied to the fibers in the middle portion of the unheld short fiber sliver located between the drafting mechanism and the twisting triangle zone (e.g., ...). Figure 2 As shown), the angle between the force and the horizontal plane is 60~90°; Figure 3As shown, with the running direction of the short fiber sliver as the front-to-back direction, part of the force is vertically downward, part is inclined downward and to the left, and another part is inclined downward and to the right; the airflow pressure blowing onto the short fiber sliver is 300 Pa, the number of fibers in the short fiber sliver is 500, the main body length is 35 mm, and the running speed of the short fiber sliver is 30 m / min; the width of the fibers in the middle part of the short fiber sliver is 30% of the width of the short fiber sliver.

[0105] The final yarn has a twist of 380 twists / m and a breaking strength of 20.2 cN / tex.

[0106] Example 7

[0107] A spinning method for enhancing yarn strength, using a spinning device for enhancing yarn strength as described in Example 2, wherein m is 8, d3 is 2.5mm, r is 7, d4 is 1.33~1.57mm, d5 is 0.5mm, and the ratio of the linear speed of the front roller to the output roller is 1:1;

[0108] The specific operation is as follows: During ring spinning, a downward intermittent force (e.g., ...) is applied to the middle portion of the unheld short fiber sliver located between the drafting mechanism and the twisting triangle zone. Figure 1 As shown in the figure, the angle between the force and the horizontal plane is 60~90°; taking the running direction of the short fiber sliver as the front-back direction, part of the force is vertically downward, part is inclined downward and inclined to the left, and another part is inclined downward and inclined to the right; the interval between intermittent forces is 0.25s, the needle puncture frequency is 4 times / s, the needle puncture depth of the short fiber sliver is 2mm, the number of fibers in the short fiber sliver is 500, the main body length is 25mm, the running speed of the short fiber sliver is 10m / min; the width of the fibers in the middle part of the short fiber sliver is 60% of the width of the short fiber sliver.

[0109] The final yarn has a twist of 380 twists / m and a breaking strength of 17.5 cN / tex.

[0110] Example 8

[0111] A spinning method for enhancing yarn strength, using a spinning device for enhancing yarn strength as described in Example 2, wherein m is 9, d3 is 2.8 mm, r is 5, d4 is 0.83~0.86 mm, d5 is 0.3 mm, and the ratio of the linear speed of the front roller to the output roller is 1:1.02;

[0112] The specific operation is as follows: During ring spinning, a downward intermittent force (e.g., ...) is applied to the middle portion of the unheld short fiber sliver located between the drafting mechanism and the twisting triangle zone. Figure 1 As shown in the figure, the angle between the force and the horizontal plane is 60~90°; taking the running direction of the short fiber sliver as the front-back direction, part of the force is vertically downward, part is inclined downward and inclined to the left, and another part is inclined downward and inclined to the right; the interval between intermittent forces is 0.1s, the needle puncture frequency is 10 times / s, the needle puncture depth of the short fiber sliver is 1mm, the number of fibers in the short fiber sliver is 300, the main body length is 35mm, and the running speed of the short fiber sliver is 20m / min; the width of the fibers in the middle part of the short fiber sliver is 30% of the width of the short fiber sliver.

[0113] The final yarn has a twist of 750 twists / m and a breaking strength of 19.6 cN / tex.

[0114] Example 9

[0115] A spinning method for enhancing yarn strength, using a spinning device for enhancing yarn strength as described in Example 2, wherein m is 10, d3 is 3mm, r is 5, d4 is 0.98~1.01mm, d5 is 0.45mm, and the ratio of the linear speed of the front roller to the output roller is 1:1.03;

[0116] The specific operation is as follows: During ring spinning, a downward intermittent force (e.g., ...) is applied to the middle portion of the unheld short fiber sliver located between the drafting mechanism and the twisting triangle zone. Figure 1 As shown in the figure, the angle between the force and the horizontal plane is 60~90°; taking the running direction of the short fiber sliver as the front-back direction, part of the force is vertically downward, part is inclined downward and inclined to the left, and another part is inclined downward and inclined to the right; the interval between intermittent forces is 0.05s, the needle piercing frequency is 20 times / s, the needle penetration depth of the short fiber sliver is 1.5mm, the number of fibers in the short fiber sliver is 370, the main body length is 38mm, and the running speed of the short fiber sliver is 30m / min; the width of the fibers in the middle part of the short fiber sliver is 45% of the width of the short fiber sliver.

[0117] The final yarn has a twist of 500 twists / m and a breaking strength of 20 cN / tex.

[0118] Example 10

[0119] A spinning method for enhancing yarn strength, using a spinning device for enhancing yarn strength as described in Example 2, wherein m is 10, d3 is 3.5mm, r is 7, d4 is 1.23~1.47mm, d5 is 0.4mm, and the ratio of the linear speed of the front roller to the output roller is 1:1.05;

[0120] The specific operation is as follows: During ring spinning, a downward intermittent force (e.g., ...) is applied to the middle portion of the unheld short fiber sliver located between the drafting mechanism and the twisting triangle zone. Figure 1 As shown in the figure, the angle between the force and the horizontal plane is 60~90°; taking the running direction of the short fiber sliver as the front-back direction, part of the force is vertically downward, part is inclined downward and inclined to the left, and another part is inclined downward and inclined to the right; the interval time of the intermittent force is 0.07s, the needle piercing frequency is 15 times / s, the needle penetration depth of the short fiber sliver is 1.8mm, the number of fibers in the short fiber sliver is 480, the main body length is 28mm, and the running speed of the short fiber sliver is 25m / min; the width of the fibers in the middle part of the short fiber sliver is 50% of the width of the short fiber sliver.

[0121] The final yarn produced has a twist of 430 twists / m and a breaking strength of 18.9 cN / tex.

Claims

1. A spinning device for enhancing yarn strength, characterized in that, Includes front roller, front skin roller, output roller, output skin roller, needle punching device and web support device; The central axes of the front roller, front taper roller, output roller, and output taper roller are all parallel to the left-right direction; the output roller is located in front of the front roller, and the two are spaced apart; the output taper roller is located directly above the output roller, and the front taper roller is located directly above the front roller. The needle punching device and the fiber web support device are located between the front roller and the output roller, with the needle punching device located above the fiber web support device. The needle-punching device includes a crossbeam, a needle plate, needles, and a reciprocating motion mechanism. The crossbeam is placed horizontally and perpendicular to the running direction of the short fiber sliver. The needles are vertically mounted on the lower surface of the crossbeam via the needle plate. The reciprocating motion mechanism drives the crossbeam to move up and down. There are 8 to 10 rows of needles, each row of needles is parallel to the left and right direction, and the distance between adjacent rows of needles is 2.5 to 3.5 mm. The number of needles r in each row is 5 to 7 and r is an odd number. In each row, one needle is vertically downward, (r-1) / 2 needles are tilted downward and tilted to the left, and (r-1) / 2 needles are tilted downward and tilted to the right. The fiber web support device includes a support plate, n mesh rings, and a drive shaft I, where n≥1; the upper surface of the support plate has p grooves, which are parallel to the front-to-back direction and penetrate the support plate. When p>1, all the grooves are spaced apart in the left-to-right direction; the drive shaft I is parallel to the left-to-right direction, located behind the support plate, and also below the grooves; the drive shaft I rotates in the same direction as the front roller; all n mesh rings are simultaneously fitted onto the support plate and the drive shaft I, and each of the n mesh rings covers one of the p grooves. The reciprocating motion mechanism includes a drive shaft II, a cam, a driven wheel, a support rod, a limiting mechanism, and a connecting piece; the drive shaft II is parallel to the crossbeam and is connected to the output roller drive; the cam is fixedly sleeved on the drive shaft II and is eccentrically connected to it; the driven wheel is located above the cam, and the two are in contact on their circumferential surfaces; the support rod is arranged vertically and its lower end is fixedly connected to the driven wheel; the limiting mechanism restricts the support rod to move only in the vertical direction; the connecting piece fixes the support rod and the crossbeam together.

2. The spinning device for enhancing yarn strength according to claim 1, characterized in that, The ratio of the linear velocity of the front roller to that of the output roller is 1:1 to 1.

05.

3. The spinning device for enhancing yarn strength according to claim 1, characterized in that, The center-to-center distance between the upper ends of two adjacent needles in each row is 0.5~1mm, and the center-to-center distance between the lower ends of two adjacent needles in each row is 0.3~0.5mm.

4. A spinning device for enhancing yarn strength according to claim 3, characterized in that, The spacing between any two adjacent rows of needles is the same, and the center distance between the lower ends of any two adjacent needles in any row is the same.

5. A spinning device for enhancing yarn strength according to claim 1, characterized in that, Drive shaft II is connected to the output roller via a gearbox.

6. The spinning device for enhancing yarn strength according to claim 1, characterized in that, Drive shaft I is connected to the front roller drive.

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