High-elasticity yarn spinning method

Abstract

The invention discloses a high-elasticity yarn spinning method, which adopts a high-elasticity yarn spinning device which comprises a rear roller pair consisting of a rear lower roller and a rear upper pressing rubber roller, a middle roller pair consisting of a middle lower roller and a middle upper pressing rubber roller, and a front roller pair consisting of a front lower roller and a front upper pressing rubber roller, a rear upper control rubber roller in transmission connection with a gear set is additionally arranged on the front portion of a rear upper pressing rubber roller, a middle upper control rubber roller in transmission connection with a gear set is additionally arranged on the rear portion of a middle upper pressing rubber roller, and a front upper control rubber roller in transmission connection with a gear set is additionally arranged on the front portion of a front upper pressing rubber roller. Therefore, stable motion control over fibers with large elasticity in a drafting area is achieved in the contact of the bottoms of the rotating rear upper control rubber roller, the rotating middle upper control rubber roller and the rotating front upper control rubber roller and elastic fibers in short fiber roving in the drafting area, the drafting quality of the elastic fibers is improved, and the yarn forming quality is improved.

Description

Technical Field

[0001] The invention relates to the technical field of spinning, in particular to a high-elastic yarn spinning method. Background Art

[0002] As time progresses, people's demands for clothing fabrics continue to rise. The textile and apparel industry is currently pursuing fashion, diversity, and high quality. This has led to new demands for textile raw materials, and various new fibers are constantly being developed and applied in spinning processes. Drafting is a key step in the spinning process, encompassing the drawing, roving, and spinning steps. During drafting, fibers are gradually drawn out from the surrounding fiber group. Due to friction, hooks are gradually eliminated and curls are gradually straightened. This completely eliminates any lateral connections remaining within each fiber, creating the conditions for a firm, regular end-to-end connection. Therefore, effective fiber control during the drafting process is crucial for achieving excellent drafting results. Changing the yarn structure through drafting is a key approach to developing diverse yarn varieties in spinning, such as fancy yarns.

[0003] The introduction of various new fiber raw materials has also led to new requirements for drafting. This is particularly true for the spinning of fibers with a certain degree of elasticity. During the drafting process, the controlling force exerted on the fibers is derived from friction, including external friction generated by the drafting element upon contact with the fibers, and internal friction caused by intertwining fibers. Internal friction is primarily determined by factors such as the twist of the fed roving and the properties of the fibers within the roving, while external friction is primarily generated by the drafting element. Fibers with high elasticity exhibit a more complex state within the roving, leading to a correspondingly more complex internal friction. Furthermore, the fibers' elasticity during the drafting speed change process complicates speed control. Therefore, the key to producing highly elastic yarns lies in properly configuring the drafting element to generate the appropriate external friction field, which, in conjunction with the complex internal friction field, effectively controls fiber motion during the drafting process, thereby improving drafting efficiency and yarn quality. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-elastic yarn spinning method, which achieves stable movement control of fibers with greater elasticity in the drafting zone by arranging a certain number of upper control rubber rollers in the drafting system, thereby improving the drafting quality of the elastic fibers and improving the yarn quality.

[0005] The present invention provides a high-elastic yarn spinning method, comprising a rear roller pair consisting of a rear lower roller and a rear upper pressing rubber roller, a middle roller pair consisting of a middle lower roller and a middle upper pressing rubber roller, and a front roller pair consisting of a front lower roller and a front upper pressing rubber roller; a rear upper control rubber roller connected to the rear of the rear upper pressing rubber roller is provided with a rear bridge gear transmission, a middle upper control rubber roller connected to the rear of the middle upper pressing rubber roller is provided with a middle bridge gear transmission, and a front upper control rubber roller connected to the front bridge gear transmission is provided in front of the front upper pressing rubber roller; a staple roving made of staple fibers with an elongation of more than 30% is first subjected to a line friction force field or a surface friction force field of a first control surface formed by the suspended and rotating rear upper control rubber roller in a rear drafting zone, and then subjected to a line friction force field or a surface friction force field of a second control surface formed by the suspended and rotating middle upper control rubber roller, thereby achieving uniform twist arrangement of the staple roving or controlling the movement speed of the staple fibers, thereby producing a fiber strip;

[0006] In the front drafting zone, the short fibers in the fiber strip are drawn and drafted under the combined effect of the adaptive elastic external friction field generated by the elastic pressing middle elastic transition control surface formed by the lower short apron on the middle lower roller and the upper short apron on the middle upper pressing rubber roller, and the internal friction field formed by the short fibers' own twist causing them to embrace each other, thus producing a fiber strip.

[0007] The output fiber band is subjected to the linear friction field or surface friction field of the third control surface formed by the suspended and rotating front upper control rubber roller, which causes the fibers on both sides to gather toward the center and twist, thereby producing high-elastic yarn.

[0008] A high-elastic yarn spinning method as described above, wherein preferably, the rear upper pressing rubber roller, the middle upper pressing rubber roller, the front upper pressing rubber roller, the rear upper control rubber roller, the middle upper control rubber roller, and the front upper control rubber roller have the same structure, including a rubber roller shaft, the rubber roller shaft is a solid cylindrical structure, the rubber roller shaft is made of steel, and two adjacent spindles on the front car table or the rear car table of the spinning frame form a spindle group, the rubber roller shafts of the rear upper pressing rubber rollers of the two spindles in a spindle group are integrated and fixedly connected, the rubber roller shafts of the middle upper pressing rubber rollers are integrated and fixedly connected, the rubber roller shafts of the front upper pressing rubber rollers are integrated and fixedly connected, the rubber roller shafts of the rear upper control rubber rollers are integrated and fixedly connected, the rubber roller shafts of the middle upper control rubber rollers are integrated and fixedly connected, and the rubber roller shafts of the front The rubber roller shaft of the upper control rubber roller is integrated and fixedly connected. The rubber roller shaft between the rubber roller sleeves of the rear upper pressing rubber rollers of the two spindles in a spindle group is embedded in the rear embedded grip of the pressurizing component, the rubber roller shaft between the rubber roller sleeves of the middle upper pressing rubber roller is embedded in the middle embedded grip of the pressurizing component, and the rubber roller shaft between the rubber roller sleeves of the front upper pressing rubber roller is embedded in the front embedded grip of the pressurizing component. A rubber roller sleeve is sleeved on the rubber roller shaft corresponding to each spindle. The rubber roller sleeve is made of rubber. A connecting tube is provided between the rubber roller sleeve and the rubber roller shaft. The material of the connecting tube is the same as that of the rubber roller shaft. The rubber roller sleeve is sleeved on the connecting tube, and the rubber roller sleeve after sleeved is tightly pressed and contacted with the connecting tube through its own elasticity. The connecting tube and the rubber roller shaft are connected by a bearing.

[0009] The gear box is installed in the middle gear box, and the gear box is respectively embedded in the rubber roller shaft of the rear upper pressing rubber roller and the rubber roller shaft of the rear upper control rubber roller. The connecting tube of the middle upper pressing rubber roller and the connecting tube of the middle upper control rubber roller are connected through the middle gear box, the middle gear box is arranged in the middle gear box, and the middle gear box is respectively embedded in the rubber roller shaft of the middle upper pressing rubber roller and the rubber roller shaft of the middle upper control rubber roller. The connecting tube of the front upper pressing rubber roller and the connecting tube of the front upper control rubber roller are connected through the front gear box, and the front gear box is arranged in the front gear box, and the front gear box is respectively embedded in the rubber roller shaft of the front upper pressing rubber roller and the rubber roller shaft of the front upper control rubber roller.

[0010] A high-elastic yarn spinning method as described above, wherein, preferably, a lower short leather ring is provided on the roller sleeve of the middle lower roller, and the lower short leather ring is inserted into the roller sleeve of the middle lower roller through an elastic lower pin, and an upper short leather ring is provided on the roller sleeve of the middle upper pressing rubber roller, and the upper short leather ring is inserted into the rubber roller sleeve of the middle upper rubber roller through an elastic upper pin.

[0011] A high-elastic yarn spinning method as described above, wherein preferably, the staple roving is gripped and fed into the drafting system by the rear gripping feeding nip between the rubber roller cover of the rear upper pressing rubber roller and the roller cover of the rear lower roller, and the fed staple roving is continuously gripped and conveyed by the middle gripping transition nip between the roller cover of the middle upper pressing rubber roller and the roller cover of the middle lower roller, during which the staple roving is subjected to the drafting action of the rear gripping feeding nip and the middle gripping transition nip to obtain a fiber strip;

[0012] In the rear stretching area, the fed short fiber roving first enters the first control surface formed by the rotating rubber roller sleeve of the rear upper control rubber roller. When the elongation of the short fibers in the short fiber roving is between 30% and 50%, the bottom end of the rubber roller sleeve of the rear upper control rubber roller is set to be level with the rear holding feeding jaw through the rear bridge gear box, and the short fiber roving forms a line contact with the first control surface, thereby forming a line friction field in the process of contact between the rotating rubber roller sleeve of the rear upper control rubber roller and the short fiber roving. At this time, when the twist coefficient of the short fiber roving is greater than 90, the rotation line speed of the rubber roller sleeve of the rear upper control rubber roller set by the rear bridge gear is greater than the rear upper control roller. The rotational linear speed of the rubber roller cover of the pressure rubber roller and the linear friction force field realize the twist finishing effect on the short fibers in the staple roving. Under the twist finishing effect, the twist of the staple roving is propagated along the length direction of the short fibers with relatively small elasticity, and the twist of the staple roving is uniformly arranged during the propagation process. When the twist coefficient of the staple roving is less than 90, the rotational linear speed of the rubber roller cover of the rear upper control rubber roller is set to be equal to the rotational linear speed of the rubber roller cover of the rear upper pressing rubber roller through the rear bridge gear. Under the action of the linear friction force field, the external friction force field formed by the rear grip feeding jaw on the staple roving is linearly distributed and extends forward in the rear drafting area;

[0013] The fed short fiber roving then enters the second control surface formed by the cot cover of the rotating middle upper control rubber roller, and the bottom end of the cot cover of the middle upper control rubber roller is kept horizontal with the middle grip feeding jaw through the middle bridge gear box, and the short fiber roving forms a line contact with the second control surface, thereby forming a line friction field with a linear distribution in the process of contact between the cot cover of the middle rear upper control rubber roller and the short fiber roving. At this time, when the twist coefficient of the short fiber roving is greater than 90, the rotation line speed of the cot cover of the middle upper control rubber roller set by the middle bridge gear is less than the rotation line speed of the cot cover of the middle upper pressing rubber roller and greater than the rotation line speed of the rear upper control rubber roller. The rotation line speed and the line friction field realize a secondary twist finishing effect on the short fibers in the staple roving. Under the twist finishing effect, the twist of the staple roving is propagated along the length direction of the short fibers with relatively small elasticity, and the secondary uniform finishing of the twist of the staple roving is realized in the propagation process. When the twist coefficient of the staple roving is less than 90, the rotation speed of the rubber roller sleeve of the middle and upper control rubber roller is set to be equal to the rotation speed of the rubber roller sleeve of the middle and upper pressing rubber roller through the middle bridge gear. Under the action of the line friction field, the external friction field formed by the middle gripping transition jaw on the staple roving is distributed linearly in the rear stretching area and extends backward.

[0014] A high-elastic yarn spinning method as described above, wherein preferably, in the rear drafting zone, when the elongation of the short fibers in the staple roving is greater than 50%, the bottom end of the rubber roller cover of the rear upper control rubber roller is set at the lower part of the rear holding feeding jaw through the rear bridge gear box, and the staple roving forms a surface contact with the first control surface, thereby forming a surface friction field with a symmetrical arc surface distribution during the surface contact between the rubber roller cover of the rear upper control rubber roller and the staple roving. At this time, when the twist coefficient of the staple roving is greater than 90, the rotation linear speed of the rubber roller cover of the rear upper control rubber roller set by the rear bridge gear is greater than the rotation linear speed of the rubber roller cover of the rear upper pressing rubber roller Speed, the surface friction field pressing down on the staple fiber realizes the twist finishing effect on the staple roving, and under the twist finishing effect, the twist of the staple roving is propagated along the length direction of the staple fiber with relatively large elasticity, and the twist of the staple roving is evenly arranged during the propagation process. When the twist coefficient of the staple roving is less than 90, the rotation line speed of the rubber roller cover of the rear upper control rubber roller is set to be equal to the rotation line speed of the rubber roller cover of the rear upper pressing rubber roller through the rear bridge gear. Under the action of the surface friction field pressing down on the staple fiber, the external friction field formed by the rear grip feeding jaw on the staple roving is linearly distributed and extends forward in the rear drafting area; the feeding The staple roving then enters the second control surface formed by the cot cover of the rotating middle and upper control rubber roller, and the bottom end of the cot cover of the middle and upper control rubber roller is set at the lower part of the middle gripping feeding jaw through the middle bridge gear box, and the staple roving forms surface contact with the second control surface, thereby forming a surface friction field with a symmetrical arc surface distribution in the process of surface contact between the cot cover of the middle and rear upper control rubber roller and the staple roving. At this time, when the twist coefficient of the staple roving is greater than 90, the rotation linear speed of the cot cover of the middle and upper control rubber roller set by the middle bridge gear is less than the rotation linear speed of the cot cover of the middle and upper pressing rubber roller and greater than the rotation linear speed of the cot cover of the rear upper control rubber roller. Speed, the surface friction field pressing down on the staple fiber realizes a secondary twist finishing effect on the staple roving, and under the twist finishing effect, the twist of the staple roving is propagated along the length direction of the staple fiber with relatively large elasticity, and the secondary uniform finishing of the twist of the staple roving is realized in the propagation process. When the twist coefficient of the staple roving is less than 90, the rotation speed of the cot cover of the middle and upper control cot is set to be equal to the rotation speed of the cot cover of the middle and upper pressing cot through the middle bridge gear. Under the action of the surface friction field pressing down on the staple fiber, the external friction field formed by the middle gripping feeding jaw on the staple roving is distributed linearly in the rear stretching area and extends backward.

[0015] A high-elastic yarn spinning method as described above, wherein preferably, the fiber strips output by the middle gripping transition jaw are continuously gripped and conveyed by the front gripping output jaw between the rubber roller sleeve of the front and rear upper pressing rubber rollers and the roller sleeve of the front lower roller, during which the fiber strips are subjected to the stretching action of the front stretching zone between the middle gripping transition jaw and the front gripping output jaw to obtain a fiber belt. In the front stretching zone, the fiber strips output by the middle gripping transition jaw first immediately enter the middle elastic transition control surface between the lower short leather ring supported by the elastic lower pin and the upper short leather ring supported by the elastic upper pin, and in the elastically pressed middle elastic transition control surface The elastic short fibers are subjected to an adaptive elastic control force, under which the short fibers in the fiber strip are transported forward at a speed consistent with that of the middle holding transition jaw. When the short fibers in the fiber strip leave the middle holding feeding jaw, the short fibers are held together by their own twist to form an internal friction field, so that the short fibers in the fiber strip continue to be transported forward at a speed consistent with that of the middle holding transition jaw until they enter the front holding feeding jaw. The short fibers held by the front holding output jaw are immediately pulled out of the fiber strip, thereby obtaining a fiber belt with the required linear density.

[0016] A high-elastic yarn spinning method as described above, wherein preferably, the fiber band continuously output through the front holding output jaw immediately enters the third control surface formed by the rubber roller sleeve of the rotating front upper control rubber roller, and when the elongation of the short fibers in the staple roving is between 30% and 50%, the bottom end of the rubber roller sleeve of the front upper control rubber roller is set to be level with the front holding output jaw through the front bridge gear box, and the fiber band forms a line contact with the third control surface, thereby forming a line friction field in the process of the rubber roller sleeve of the rotating front upper control rubber roller and the fiber band in line contact, and the rotational linear speed of the rubber roller sleeve of the front upper control rubber roller is set to be equal to the rotational linear speed of the rubber roller sleeve of the front upper pressing rubber roller through the front bridge gear, and the line friction field realizes a linearly distributed extension control effect on the short fibers in the fiber band, thereby realizing the external friction field formed by the front holding output jaw on the fiber band outside the drafting system. The forward extension of the line distribution realizes the twisting effect of the short fibers with relatively low elasticity in the fiber belt, which makes the fibers on both sides gather toward the center under stable control. When the elongation of the short fibers in the staple roving is greater than 50%, the bottom end of the rubber roller sleeve of the front upper control rubber roller is located at the lower part of the front holding output jaw through the front bridge gear box, and the fiber belt forms a surface contact with the third control surface, thereby forming a surface friction field with a symmetrical arc surface distribution in the process of the rubber roller sleeve of the front upper control rubber roller and the fiber belt surface contact, and the rotational linear speed of the rubber roller sleeve of the front upper control rubber roller is set by the front bridge gear to be equal to the rotational linear speed of the rubber roller sleeve of the front upper pressing rubber roller. Under the action of the downward surface friction field, the short fibers with relatively high elasticity are transported in a certain elongation state and the twisting is completed, thereby realizing the twisting effect of the short fibers with relatively high elasticity in the fiber belt, which makes the fibers on both sides gather toward the center under stable control.

[0017] A high-elastic yarn spinning method as described above, wherein, preferably, the fiber band output by the drafting system is converged and twisted at the twisting point under the action of the twisting twist to obtain the required spun yarn. During this process, the main motor drives the spindle to rotate through the spindle band, and then drives the bobbin to rotate. The rotation of the bobbin then drives the spun yarn to pass through the yarn guide hook and the wire ring in turn and be wound around the bobbin, thereby driving the wire ring to rotate around the steel collar. At this time, due to the flexible structure of the spun yarn and the weight of the wire ring itself, the winding speed of the spun yarn on the bobbin is less than the rotation speed of the bobbin. The speed difference between the two generates twisting twist, and the generated twisting twist is transmitted from bottom to top. When it is transmitted to the twisting point, the fiber band is twisted under the action of the transmitted twist to obtain the final elastic yarn.

[0018] A high-elastic yarn spinning method as described above, wherein preferably, the roller shafts of the rear lower rollers at 20-24 spindles on the front or rear car table of the spinning frame are integrated and fixedly connected, and the roller shafts of two adjacent rear lower rollers are connected through the rear roller seat. The roller shafts of the middle lower rollers at 14-16 spindles on the front or rear car table of the spinning frame are integrated and fixedly connected, and the roller shafts of two adjacent middle lower rollers are connected through the middle roller seat. The roller shafts of the front lower rollers at 6-8 spindles on the front or rear car table of the spinning frame are integrated and fixedly connected, and the roller shafts of two adjacent front lower rollers are connected through the front roller seat.

[0019] Compared with the prior art, the present invention achieves stable movement control of fibers with greater elasticity in the drafting zone by adding a rear upper control rubber roller connected to a gear set at the front of the rear upper pressure rubber roller, adding a middle upper control rubber roller connected to a gear set at the rear of the middle upper pressure rubber roller, and adding a front upper control rubber roller connected to a gear set at the front of the front upper pressure rubber roller. In this way, when the bottoms of the rotating rear upper control rubber roller, middle upper control rubber roller, and front upper control rubber roller are in contact with the elastic fibers in the short fiber roving in the drafting zone, the drafting quality of the elastic fibers is improved, and the yarn quality is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of a high-elastic yarn spinning device provided by an embodiment of the present invention.

[0021] Description of reference numerals:

[0022] 1-spun roving, 2-rear lower roller, 3-rear upper pressing rubber roller, 4-rear upper control rubber roller, 5-middle lower roller, 6-middle upper pressing rubber roller, 7-middle upper control rubber roller, 8-front lower roller, 9-front upper pressing rubber roller, 10-front upper control rubber roller, 11-roller shaft, 12-roller sleeve, 13-rubber roller shaft, 14-rubber roller sleeve, 15-rear bridge gear, 16-middle bridge gear, 17-front bridge gear, 18-first servo motor, 19-second servo motor, 20-third servo motor, 21-programmable logic controller, 22-yarn guide hook, 23-wire traveler, 24-steel collar, 25-bobbin, 26-upper short apron, 27-lower short apron. DETAILED DESCRIPTION

[0023] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention.

[0024] The present invention provides a high-elastic yarn spinning method, using a high-elastic yarn spinning device, referring to Figure 1 As shown, the high-elastic yarn spinning device includes a drafting system. The drafting system includes a rear lower roller 2, a middle lower roller 5, and a front lower roller 8 along the movement direction of the fiber in the drafting system. The rear lower roller 2, the middle lower roller 5, and the front lower roller 8 have the same structure, including a roller shaft 11. The roller shaft 11 is a solid cylindrical structure. The roller shaft 11 is made of steel. A roller sleeve 12 is fixed on the roller shaft 11 corresponding to each spindle position. The roller sleeve 12 is integrally connected to the roller shaft 11. The material of the roller sleeve 12 and the roller shaft 11 is exactly the same. The 2 front car table or the rear car table of the spinning frame The roller shafts 11 of the rear lower rollers 2 of 0-24 spindle positions are integrated and fixedly connected, and the roller shafts 11 of two adjacent rear lower rollers 2 are connected by transmission through the rear roller seat. The roller shafts 11 of the middle lower rollers 5 of 14-16 spindle positions on the front or rear car table of the spinning frame are integrated and fixedly connected, and the roller shafts 11 of two adjacent middle lower rollers 5 are connected by transmission through the middle roller seat. The roller shafts 11 of the front lower rollers 8 of 6-8 spindle positions on the front or rear car table of the spinning frame are integrated and fixedly connected, and the roller shafts 11 of two adjacent front lower rollers 8 are connected by transmission through the front roller seat.

[0025] The upper part of the rear lower roller 2, the middle lower roller 5 and the front lower roller 8 are respectively provided with a rear upper pressing rubber roller 3, a middle upper pressing rubber roller 6 and a front upper pressing rubber roller 9. The front part of the rear upper pressing rubber roller 3 is provided with a rear upper control rubber roller 4. The rear upper control rubber roller 4 is located between the rear upper pressing rubber roller 3 and the middle upper pressing rubber roller 6. The rear part of the middle upper pressing rubber roller 6 is provided with a middle upper control rubber roller 7. The middle upper control rubber roller 7 is located between the rear upper control rubber roller 4 and the middle upper pressing rubber roller 6. The front part of the front upper pressing rubber roller 9 is provided with a front upper control rubber roller 10. The rear upper pressing rubber roller 3, the middle upper pressing rubber roller 6, the front upper pressing rubber roller 9, the rear upper control rubber roller 4, the middle upper control rubber roller 7 and the front upper control rubber roller 10 have the same structure, including a rubber roller shaft 13. The rubber roller shaft 13 is The solid cylindrical structure, the rubber roller shaft 13 is made of steel. The adjacent two spindles on the front or rear car table of the spinning machine form a spindle group. The rubber roller shafts 13 of the upper and rear pressing rubber rollers 3 of the two spindles in a spindle group are integrated and fixedly connected, the rubber roller shafts 13 of the middle and upper pressing rubber rollers 6 are integrated and fixedly connected, the rubber roller shafts 13 of the front and upper pressing rubber rollers 9 are integrated and fixedly connected, the rubber roller shafts 13 of the upper and rear control rubber rollers 4 are integrated and fixedly connected, the rubber roller shafts 13 of the middle and upper control rubber rollers 7 are integrated and fixedly connected, and the rubber roller shafts 13 of the front and upper control rubber rollers 10 are integrated and fixedly connected. The rubber roller shafts 13 between the rubber roller sleeves 14 of the upper and rear pressing rubber rollers 3 of the two spindles in a spindle group are embedded in the rear embedded grip of the pressure component, the middle and upper pressing rubber rollers The rubber roller shaft 13 between the rubber roller sleeves 14 of 6 is embedded in the middle embedding grip of the pressure component, and the rubber roller shaft 13 between the rubber roller sleeves 14 of the front upper pressing rubber roller 9 is embedded in the front embedding grip of the pressure component. A rubber roller sleeve 14 is sleeved on the rubber roller shaft 13 corresponding to each spindle position. The rubber roller sleeve 14 is made of rubber. A connecting tube is provided between the rubber roller sleeve 14 and the rubber roller shaft 13. The material of the connecting tube is the same as that of the rubber roller shaft 13. The rubber roller sleeve 14 is sleeved on the connecting tube, and the rubber roller sleeve 14 after sleeved is tightly pressed and contacted with the connecting tube through its own elasticity. The connecting tube and the rubber roller shaft 13 are connected through a bearing. The corresponding rubber roller sleeve 14 extends from the inward side of the connecting tube. The connecting tube of the rear upper pressing rubber roller 3 and the connecting tube of the rear upper control rubber roller 4 are connected through the rear The axle gear 15 is connected in transmission, the rear axle gear 15 is arranged in the rear axle gear 15 box, and the rear axle gear 15 box is respectively embedded in the rubber roller shaft 13 of the rear upper pressing rubber roller 3 and the rubber roller shaft 13 of the rear upper control rubber roller 4. The connecting tube of the middle upper pressing rubber roller 6 and the connecting tube of the middle upper control rubber roller 7 are connected in transmission through the middle axle gear 16, and the middle axle gear 16 is arranged in the middle axle gear 16 box. The middle axle gear 16 box is respectively embedded in the rubber roller shaft 13 of the middle upper pressing rubber roller 6 and the rubber roller shaft 13 of the middle upper control rubber roller 7. The connecting tube of the front upper pressing rubber roller 9 and the connecting tube of the front upper control rubber roller 10 are connected in transmission through the front axle gear 17, and the front axle gear 17 is arranged in the front axle gear 17 box.The front axle gear 17 is respectively embedded and connected with the rubber roller shaft 13 of the front upper pressing rubber roller 9 and the rubber roller shaft 13 of the front upper control rubber roller 10.

[0026] A lower short leather ring 27 is provided on the roller sleeve 12 of the middle lower roller 5, and the lower short leather ring 27 is sleeved on the roller sleeve 12 of the middle lower roller 5 through an elastic lower pin. An upper short leather ring 26 is provided on the roller sleeve 12 of the middle upper pressing rubber roller 6, and the upper short leather ring 26 is sleeved on the rubber roller sleeve 14 of the middle upper rubber roller through an elastic upper pin.

[0027] The roller shaft 11 of the rear bottom roller 2 is driven to rotate by the first servo motor 18, the roller shaft 11 of the middle bottom roller 5 is driven to rotate by the second servo motor 19, and the roller shaft 11 of the front bottom roller 8 is driven to rotate by the third servo motor 20. The first servo motor 18, the second servo motor 19, and the third servo motor 20 are all connected to the programmable logic controller 2121.

[0028] When in use, the pressure assembly is pressed down, so that the rubber roller cover 14 of the rear upper pressing rubber roller 3 is closely pressed and contacted with the roller cover 12 of the rear lower roller 22, thereby forming a rear holding jaw between the rubber roller cover 14 of the rear upper pressing rubber roller 3 and the roller cover 12 of the rear lower roller 2 that is pressed and contacted, so that the upper short leather ring 26 on the rubber roller cover 14 of the middle upper pressing rubber roller 6 is closely pressed and contacted with the lower short leather ring 27 on the roller cover 12 of the middle lower roller 5, thereby forming a middle holding jaw between the two, and making the lower short leather ring supported by the elastic lower pin The ring 27 is in close pressing contact with the upper short leather ring 26 supported by the elastic upper pin, thereby forming a middle elastic control surface between the two, so that the rubber roller cover 14 of the front upper pressing rubber roller 9 and the roller cover 12 of the front lower roller 8 are in close pressing contact, thereby forming a front gripping jaw between the rubber roller cover 14 of the front upper pressing rubber roller 9 and the roller cover 12 of the front lower roller 8 in pressing contact, and at the same time, the bottom of the rubber roller cover 14 of the rear upper control rubber roller 4, the middle upper control rubber roller 7, and the front upper control rubber roller 10 are in a suspended state without pressing contact.

[0029] The first servo motor 18 drives the roller shaft 11 of the rear lower roller 2 to rotate, thereby driving the roller sleeve 12 of the rear lower roller 2 integrally connected thereto to rotate synchronously, and the roller sleeve 12 of the rear lower roller 2 rotates and then drives the rubber roller sleeve 14 of the rear upper pressing rubber roller 3 that is in close pressing contact with it to rotate, and then drives the connecting tube that is closely pressed with the rubber roller sleeve 14 of the rear upper pressing rubber roller 3 to rotate, so that the rear holding jaw is transformed into a rear holding feeding jaw, and the connecting tube of the rear upper pressing rubber roller 3 rotates and then drives the connecting tube of the rear upper control rubber roller 4 to rotate through the rear bridge gear 15, and then drives the rubber roller sleeve 14 of the rear upper control rubber roller 4 that is in close pressing contact with it to rotate, so that the rotating lower circular surface of the rubber roller sleeve 14 of the rear upper control rubber roller 4 that is in a suspended state at this time forms the first control surface for fiber control.

[0030] The second servo motor 19 drives the roller shaft 11 of the middle and lower roller 5 to rotate, thereby driving the roller sleeve 12 of the middle and lower roller 5 connected thereto to rotate synchronously, and the roller sleeve 12 of the middle and lower roller 5 rotates and then drives the lower short leather ring 27 tightly sleeved therewith to rotate, and the lower short leather ring 27 rotates and then drives the upper short leather ring 26 tightly pressed therewith to rotate, and then drives the rubber roller sleeve 14 of the middle and upper pressing rubber roller 6 tightly sleeved therewith to rotate, and then drives the rubber roller sleeve 14 tightly pressed against the middle and upper pressing rubber roller 6. The connecting tube rotates, thereby transforming the middle holding jaw into the middle holding transition jaw, and transforming the middle elastic control surface into the middle elastic transition control surface. The connecting tube of the middle upper pressing rubber roller 6 rotates and then drives the connecting tube of the middle upper control rubber roller 7 to rotate through the middle bridge gear 16, and then drives the rubber roller sleeve 14 of the middle upper control rubber roller 7 in close pressing contact with it to rotate, so that the rotating lower circular surface of the rubber roller sleeve 14 of the middle upper control rubber roller 7 in a suspended state at this time forms a second control surface for fiber control.

[0031] The third servo motor 20 drives the roller shaft 11 of the front lower roller 8 to rotate, thereby driving the roller sleeve 12 of the front lower roller 8 integrally connected thereto to rotate synchronously, the roller sleeve 12 of the front lower roller 8 rotates and then drives the rubber roller sleeve 14 of the front upper pressing rubber roller 9 that is in close contact with it to rotate, and then drives the connecting tube that is closely pressed against the rubber roller sleeve 14 of the front upper pressing rubber roller 9 to rotate, so that the front holding jaw is transformed into a front holding output jaw, the connecting tube of the front upper pressing rubber roller 9 rotates and then drives the connecting tube of the front upper control rubber roller 10 to rotate through the front bridge gear 17, and then drives the rubber roller sleeve 14 of the front upper control rubber roller 10 that is in close contact with it to rotate, so that the rotating lower circular surface of the rubber roller sleeve 14 of the front upper control rubber roller 10 that is in a suspended state at this time forms a third control surface for fiber control.

[0032] During spinning, the required staple roving 11 is selected and fed into the drafting system, and the elongation of the short fibers in the staple roving 1 is above 30%. At this time, the staple roving 1 is held and fed into the drafting system by the rear holding feeding jaws between the rubber roller sleeve 14 of the rear upper pressing rubber roller 3 and the roller sleeve 12 of the rear lower roller 2, and the fed staple roving 1 is continuously held and transported by the middle holding transition jaws, during which it is subjected to the drafting action of the rear drafting zone between the rear holding feeding jaws and the middle holding transition jaws to obtain fiber strips.

[0033] In the rear stretching zone, the fed short fiber roving 1 first enters the first control surface formed by the rubber roller cover 14 of the rotating rear upper control rubber roller 4. When the elongation of the short fibers in the short fiber roving 1 is between 30% and 50%, the bottom end of the rubber roller cover 14 of the rear upper control rubber roller 4 is set to be level with the rear holding feeding jaw through the rear bridge gear 15 box, and the short fiber roving 1 forms a line contact with the first control surface, thereby forming a line friction field in the process of the line contact between the rubber roller cover 14 of the rotating rear upper control rubber roller 4 and the short fiber roving 1. At this time, when the twist coefficient of the short fiber roving 1 is greater than 90, the rotation line speed of the rubber roller cover 14 of the rear upper control rubber roller 4 is set through the rear bridge gear 15. The rotational speed of the rubber roller cover 14 of the rear upper pressing rubber roller 3 is greater than the rotational speed of the rubber roller cover 14 of the rear upper pressing rubber roller 3, and the linear friction force field realizes the twist finishing effect on the short fibers in the staple roving 1. Under the twist finishing effect, the twist of the staple roving 1 is propagated along the length direction of the short fibers with relatively small elasticity, and the twist of the staple roving 1 is uniformly arranged during the propagation process. When the twist coefficient of the staple roving 1 is less than 90, the rotational speed of the rubber roller cover 14 of the rear upper controlling rubber roller 4 is set to be equal to the rotational speed of the rubber roller cover 14 of the rear upper pressing rubber roller 3 through the rear bridge gear 15. Under the action of the linear friction force field, the external friction force field formed by the rear holding feeding jaw on the staple roving 1 is linearly distributed in the rear drafting area. The cloth extends forward; the fed short fiber roving 1 then enters the second control surface formed by the rubber roller cover 14 of the rotating middle upper control rubber roller 7, and the bottom end of the rubber roller cover 14 of the middle upper control rubber roller 7 is kept horizontal with the middle grip feeding jaw through the middle bridge gear 16 box, and the short fiber roving 1 forms a line contact with the second control surface, thereby forming a line friction field with a linear distribution in the process of line contact between the rubber roller cover 14 of the middle rear upper control rubber roller 4 and the short fiber roving 1. At this time, when the twist coefficient of the short fiber roving 1 is greater than 90, the rotation line speed of the rubber roller cover 14 of the middle upper control rubber roller 7 set by the middle bridge gear 16 is less than the rotation line speed of the rubber roller cover 14 of the middle upper pressing rubber roller 6 and greater than The rear upper control rubber roller 4 controls the rotational linear speed, and the linear friction force field realizes a secondary twist finishing effect on the short fibers in the staple roving 1. Under the twist finishing effect, the twist of the staple roving 1 is propagated along the length direction of the short fibers with relatively small elasticity, and the secondary uniform finishing of the twist of the staple roving 1 is realized in the propagation process. When the twist coefficient of the staple roving 1 is less than 90, the rotation speed of the rubber roller cover 14 of the middle upper control rubber roller 7 is set to be equal to the rotation speed of the rubber roller cover 14 of the middle upper pressing rubber roller 6 through the middle bridge gear 16. Under the action of the linear friction force field, the external friction force field formed by the middle gripping transition jaw on the staple roving 1 is linearly distributed and extends backward in the rear stretching area.

[0034] When the elongation of the staple fibers in the staple roving 1 is greater than 50%, the bottom end of the rubber roller cover 14 of the rear upper control rubber roller 4 is located at the lower part of the rear holding feeding jaws through the rear bridge gear 15 box, and the staple roving 1 forms a surface contact with the first control surface, thereby forming a surface friction field with a symmetrical arc surface distribution during the surface contact between the rubber roller cover 14 of the rear upper control rubber roller 4 and the staple roving 1. At this time, when the twist coefficient of the staple roving 1 is greater than 90, the rotational linear speed of the rubber roller cover 14 of the rear upper control rubber roller 4 is set by the rear bridge gear 15 to be greater than the rotational linear speed of the rubber roller cover 14 of the rear upper pressing rubber roller 3, and the surface friction field pressing down the staple fibers has an impact on the staple roving 1. The twist finishing effect is achieved. Under the twist finishing effect, the twist of the staple roving 1 is propagated along the length direction of the staple fiber with relatively large elasticity, and the twist of the staple roving 1 is evenly arranged during the propagation process. When the twist coefficient of the staple roving 1 is less than 90, the rotational linear speed of the rubber roller cover 14 of the rear upper control rubber roller 4 is set to be equal to the rotational linear speed of the rubber roller cover 14 of the rear upper pressing rubber roller 3 through the rear bridge gear 15. Under the action of the surface friction field pressing down on the staple fiber, the external friction field formed by the rear holding feeding jaw on the staple roving 1 is linearly distributed and extends forward in the rear drafting area; the fed staple roving 1 then enters the rotating middle and upper control rubber roller The second control surface is formed by the rubber roller cover 14 of the roller 7, and the bottom end of the rubber roller cover 14 of the middle upper control rubber roller 7 is located at the lower part of the middle grip feeding jaw through the middle bridge gear 16 box. The short fiber roving 1 forms a surface contact with the second control surface, thereby forming a surface friction field with a symmetrical arc surface distribution during the surface contact between the rubber roller cover 14 of the middle rear upper control rubber roller 4 and the short fiber roving 1. At this time, when the twist coefficient of the short fiber roving 1 is greater than 90, the rotation linear speed of the rubber roller cover 14 of the middle upper control rubber roller 7 set by the middle bridge gear 16 is less than the rotation linear speed of the rubber roller cover 14 of the middle upper pressing rubber roller 6 and greater than the rotation linear speed of the rubber roller cover 14 of the rear upper control rubber roller 4 The surface friction field pressing down on the staple fiber realizes a secondary twist finishing effect on the staple roving 1. Under the twist finishing effect, the twist of the staple roving 1 is propagated along the length direction of the staple fiber with relatively large elasticity, and the secondary uniform finishing of the twist of the staple roving 1 is realized in the propagation process. When the twist coefficient of the staple roving 1 is less than 90, the rotation speed of the rubber roller cover 14 of the middle and upper control rubber roller 7 is set to be equal to the rotation speed of the rubber roller cover 14 of the middle and upper pressing rubber roller 6 through the middle bridge gear 16. Under the action of the surface friction field pressing down on the staple fiber, the external friction field formed by the middle gripping feeding jaw on the staple roving 1 is linearly distributed and extends backward in the rear stretching area.

[0035] The fiber strip output by the middle holding transition jaw is continuously held and conveyed by the front holding output jaw, during which it is stretched by the front stretching zone between the middle holding transition jaw and the front holding output jaw to obtain a fiber band. In the front stretching zone, the fiber strip output by the middle holding transition jaw first immediately enters the middle elastic transition control surface. In the elastically pressed middle elastic transition control surface, the elastic short fibers are subjected to an adaptive elastic control force. Under the elastic control force, the short fibers in the fiber strip are kept at the same speed as that of the middle holding transition jaw and transported forward. After the short fibers in the fiber strip break away from the middle holding feeding jaw, the short fibers in the fiber strip continue to be transported forward at the same speed as that of the middle holding transition jaw under the action of the internal friction field formed by the mutual embrace of the short fibers due to their own twist, until they enter the front holding feeding jaw, and the short fibers held by the front holding output jaw are immediately pulled out of the fiber strip, thereby obtaining a fiber band with the required linear density.

[0036] The fiber band continuously output through the front holding output jaw immediately enters the third control surface formed by the rubber roller cover 14 of the rotating front upper control rubber roller 10. When the elongation of the short fibers in the staple roving 1 is between 30% and 50%, the bottom end of the rubber roller cover 14 of the front upper control rubber roller 10 is kept horizontal with the front holding output jaw through the front bridge gear 17 box, and the fiber band forms a line contact with the third control surface, thereby forming a line friction field in the process of the rubber roller cover 14 of the rotating front upper control rubber roller 10 in line contact with the fiber band, and the front bridge gear 17 sets the rotation line speed of the rubber roller cover 14 of the front upper control rubber roller 10 to be equal to the rotation line speed of the rubber roller cover 14 of the front upper pressing rubber roller 9, and the line friction field realizes a linearly distributed extension control effect on the short fibers in the fiber band, thereby realizing the linearly distributed forward extension of the external friction field formed by the front holding output jaw on the fiber band outside the drafting system, thereby achieving The short fibers with relatively small elasticity in the fiber band are twisted to gather the fibers on both sides toward the center under stable control. When the elongation of the short fibers in the staple roving 1 is greater than 50%, the bottom end of the rubber roller cover 14 of the front upper control rubber roller 10 is located at the lower part of the front holding output jaw through the front bridge gear 17 box, and the fiber band forms surface contact with the third control surface, thereby forming a surface friction field with a symmetrical arc surface distribution during the surface contact between the rubber roller cover 14 of the front upper control rubber roller 10 and the fiber band, and the front bridge gear 17 is used to set the rotational linear speed of the rubber roller cover 14 of the front upper control rubber roller 10 to be equal to the rotational linear speed of the rubber roller cover 14 of the front upper pressing rubber roller 9. Under the action of the downward surface friction field, the short fibers with relatively large elasticity are transported in a certain elongation state and twisting is completed, thereby realizing the twisting effect of the short fibers with relatively large elasticity in the fiber band to gather the fibers on both sides toward the center under stable control.

[0037] The fiber band output by the drafting system is converged and twisted at the twisting point under the action of twisting twist to obtain the required spun yarn. In this process, the main motor drives the spindle to rotate through the spindle belt, and then drives 25 to rotate. The rotation of 25 then drives the spun yarn to pass through the yarn guide hook 22 and the wire ring 23 in turn and wind around 25, thereby driving the wire ring 23 to rotate around the steel collar 24 where it is located. At this time, due to the flexible structure of the spun yarn and the weight of the wire ring 23 itself, the winding speed of the spun yarn on 25 is less than the rotation speed of 25. The speed difference between the two produces twisting twist, and the generated twisting twist is transmitted from bottom to top. When it is transmitted to the twisting point, the fiber band is twisted under the action of the transmitted twist to obtain the final elastic yarn.

[0038] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, but the scope of implementation of the present invention is not limited to what is shown in the drawings. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which do not exceed the spirit covered by the description and drawings, should be within the scope of protection of the present invention.

Claims

1. A high-elastic yarn spinning method comprising a rear roller pair consisting of a rear bottom roller and a rear upper pressing rubber roller, a middle roller pair consisting of a middle bottom roller and a middle upper pressing rubber roller, and a front roller pair consisting of a front bottom roller and a front upper pressing rubber roller, characterized in that: A rear upper control rubber roller connected to the rear upper pressing rubber roller by a rear bridge gear is provided at the rear of the rear upper pressing rubber roller, a middle upper control rubber roller connected to the middle bridge gear is provided at the rear of the middle upper pressing rubber roller, and a front upper control rubber roller connected to the front bridge gear is provided at the front of the front upper pressing rubber roller. Staple roving made of staple fibers with an elongation of more than 30% is first subjected to a line friction force field or a surface friction force field of a first control surface formed by the suspended and rotating rear upper control rubber roller in a rear drafting zone, and then is subjected to a line friction force field or a surface friction force field of a second control surface formed by the suspended and rotating middle upper control rubber roller, thereby achieving uniform twist arrangement of the staple roving or controlling the movement speed of the staple fibers, thereby producing fiber strips. In the front drafting zone, the short fibers in the fiber strip are drawn and drafted under the combined effect of the adaptive elastic external friction field generated by the elastic pressing middle elastic transition control surface formed by the lower short apron on the middle lower roller and the upper short apron on the middle upper pressing rubber roller, and the internal friction field formed by the short fibers' own twist causing them to embrace each other, thus producing a fiber strip. The output fiber band is subjected to the linear friction field or surface friction field of the third control surface formed by the suspended and rotating front upper control rubber roller, which causes the fibers on both sides to gather toward the center and twist, thereby producing high-elastic yarn.

2. A high-elastic yarn spinning method according to claim 1, characterized in that: The structures of the rear upper pressing rubber roller, the middle upper pressing rubber roller, the front upper pressing rubber roller, the rear upper control rubber roller, the middle upper control rubber roller and the front upper control rubber roller are the same, including the rubber roller shaft, the rubber roller shaft is a solid cylindrical structure, the rubber roller shaft is made of steel, the two adjacent spindles on the front car table or the rear car table of the spinning frame form a spindle group, the rubber roller shafts of the rear upper pressing rubber rollers of the two spindles in a spindle group are integrated and fixedly connected, the rubber roller shafts of the middle upper pressing rubber rollers are integrated and fixedly connected, the rubber roller shafts of the front upper pressing rubber rollers are integrated and fixedly connected, the rubber roller shafts of the rear upper control rubber rollers are integrated and fixedly connected, the rubber roller shafts of the middle upper control rubber rollers are integrated and fixedly connected, and the rubber roller shafts of the front upper control rubber rollers are integrated and fixedly connected. The rubber roller shaft corresponding to each spindle position is sleeved with a rubber roller sleeve, and the rubber roller sleeve is made of rubber. A connecting tube is provided between the rubber roller sleeve and the rubber roller shaft. The material of the connecting tube is the same as that of the rubber roller shaft. The rubber roller sleeve is sleeved on the connecting tube, and the rubber roller sleeve after sleeved is tightly pressed and contacted with the connecting tube by its own elasticity. The connecting tube and the rubber roller shaft are connected by a bearing.

3. A high-elastic yarn spinning method according to claim 2, characterized in that: The corresponding rubber roller sleeve extends from the inward side of the connecting cylinder, and the connecting cylinder of the rear upper pressing rubber roller and the connecting cylinder of the rear upper control rubber roller are connected through the rear overpass gear, and the rear overpass gear is arranged in the rear overpass gear box, and the rear overpass gear box is respectively embedded and connected with the rubber roller shaft of the rear upper pressing rubber roller and the rubber roller shaft of the rear upper control rubber roller. The connecting cylinder of the middle upper pressing rubber roller and the connecting cylinder of the middle upper control rubber roller are connected through the middle overpass gear, and the middle overpass gear is arranged in the middle overpass gear box, and the middle overpass gear box is respectively embedded and connected with the rubber roller shaft of the middle upper pressing rubber roller and the rubber roller shaft of the middle upper control rubber roller. The connecting cylinder of the front upper pressing rubber roller and the connecting cylinder of the front upper control rubber roller are connected through the front overpass gear, and the front overpass gear is arranged in the front overpass gear box, and the front overpass gear box is respectively embedded and connected with the rubber roller shaft of the front upper pressing rubber roller and the rubber roller shaft of the front upper control rubber roller.

4. The high-elastic yarn spinning method according to claim 1, characterized in that: A lower short leather ring is provided on the roller sleeve of the middle lower roller, and the lower short leather ring is sleeved on the roller sleeve of the middle lower roller through an elastic lower pin. An upper short leather ring is provided on the roller sleeve of the middle upper pressing rubber roller, and the upper short leather ring is sleeved on the rubber roller sleeve of the middle upper rubber roller through an elastic upper pin.

5. The high-elastic yarn spinning method according to claim 1, characterized in that: The staple roving is gripped and fed into the drafting system by the rear gripping feeding nip between the rubber roller cover of the rear upper pressing rubber roller and the roller cover of the rear lower roller. The fed staple roving is then continuously gripped and conveyed by the middle gripping transition nip between the roller cover of the middle upper pressing rubber roller and the roller cover of the middle lower roller. During this period, it is drafted by the rear gripping feeding nip and the middle gripping transition nip to obtain fiber strips. In the rear stretching area, the fed short fiber roving first enters the first control surface formed by the rotating rubber roller sleeve of the rear upper control rubber roller. When the elongation of the short fibers in the short fiber roving is between 30% and 50%, the bottom end of the rubber roller sleeve of the rear upper control rubber roller is set to be level with the rear holding feeding jaw through the rear bridge gear box, and the short fiber roving forms a line contact with the first control surface, thereby forming a line friction field in the process of contact between the rotating rubber roller sleeve of the rear upper control rubber roller and the short fiber roving. At this time, when the twist coefficient of the short fiber roving is greater than 90, the rotation line speed of the rubber roller sleeve of the rear upper control rubber roller set by the rear bridge gear is greater than the rear upper control roller. The rotational linear speed of the rubber roller cover of the pressure rubber roller and the linear friction force field realize the twist finishing effect on the short fibers in the staple roving. Under the twist finishing effect, the twist of the staple roving is propagated along the length direction of the short fibers with relatively small elasticity, and the twist of the staple roving is uniformly arranged during the propagation process. When the twist coefficient of the staple roving is less than 90, the rotational linear speed of the rubber roller cover of the rear upper control rubber roller is set to be equal to the rotational linear speed of the rubber roller cover of the rear upper pressing rubber roller through the rear bridge gear. Under the action of the linear friction force field, the external friction force field formed by the rear grip feeding jaw on the staple roving is linearly distributed and extends forward in the rear drafting area; The fed short fiber roving then enters the second control surface formed by the cot cover of the rotating middle upper control rubber roller, and the bottom end of the cot cover of the middle upper control rubber roller is kept horizontal with the middle grip feeding jaw through the middle bridge gear box, and the short fiber roving forms a line contact with the second control surface, thereby forming a line friction field with a linear distribution in the process of contact between the cot cover of the middle rear upper control rubber roller and the short fiber roving. At this time, when the twist coefficient of the short fiber roving is greater than 90, the rotation line speed of the cot cover of the middle upper control rubber roller set by the middle bridge gear is less than the rotation line speed of the cot cover of the middle upper pressing rubber roller and greater than the rotation line speed of the rear upper control rubber roller. The rotation line speed and the line friction field realize a secondary twist finishing effect on the short fibers in the staple roving. Under the twist finishing effect, the twist of the staple roving is propagated along the length direction of the short fibers with relatively small elasticity, and the secondary uniform finishing of the twist of the staple roving is realized in the propagation process. When the twist coefficient of the staple roving is less than 90, the rotation speed of the rubber roller sleeve of the middle and upper control rubber roller is set to be equal to the rotation speed of the rubber roller sleeve of the middle and upper pressing rubber roller through the middle bridge gear. Under the action of the line friction field, the external friction field formed by the middle gripping transition jaw on the staple roving is distributed linearly in the rear stretching area and extends backward.

6. A high-elastic yarn spinning method according to claim 5, characterized in that: In the rear stretching zone, when the elongation of the staple fibers in the staple roving is greater than 50%, the bottom end of the rubber roller cover of the rear upper control rubber roller is located at the lower part of the rear holding feeding jaws through the rear bridge gear box, and the staple roving forms surface contact with the first control surface, thereby forming a surface friction field with a symmetrical arc surface distribution during the surface contact between the rubber roller cover of the rear upper control rubber roller and the staple roving. At this time, when the twist coefficient of the staple roving is greater than 90, the rotational linear speed of the rubber roller cover of the rear upper control rubber roller set by the rear bridge gear is greater than the rotational linear speed of the rubber roller cover of the rear upper pressing rubber roller, and the surface friction field pressing down on the staple fibers has a great influence on the staple fibers. The roving realizes the twist finishing effect, under which the twist of the staple roving is propagated along the length direction of the short fiber with relatively large elasticity, and the twist of the staple roving is evenly arranged during the propagation process. When the twist coefficient of the staple roving is less than 90, the rotational speed of the rubber roller cover of the rear upper control rubber roller is set to be equal to the rotational speed of the rubber roller cover of the rear upper pressing rubber roller through the rear bridge gear. Under the action of the surface friction field pressing down on the staple fiber, the external friction field formed by the rear grip feeding jaw on the staple roving is linearly distributed and extends forward in the rear drafting area; the fed staple roving then enters the rotating The second control surface is formed by the rubber roller cover of the middle upper control rubber roller, and the bottom end of the rubber roller cover of the middle upper control rubber roller is located at the lower part of the middle holding feeding jaw through the middle bridge gear box. The short fiber roving forms a surface contact with the second control surface, thereby forming a surface friction field with a symmetrical arc surface distribution during the surface contact between the rubber roller cover of the middle rear upper control rubber roller and the short fiber roving. At this time, when the twist coefficient of the short fiber roving is greater than 90, the rotation linear speed of the rubber roller cover of the middle upper control rubber roller is set by the middle bridge gear to be less than the rotation linear speed of the rubber roller cover of the middle upper pressing rubber roller and greater than the rotation linear speed of the rubber roller cover of the rear upper control rubber roller, which has a great influence on the short fiber roving. The surface friction force field pressed down by the three-dimensional force achieves a secondary twist finishing effect on the staple roving. Under the twist finishing effect, the twist of the staple roving is propagated along the length direction of the staple fiber with relatively large elasticity, and the secondary uniform finishing of the twist of the staple roving is achieved in the propagation process. When the twist coefficient of the staple roving is less than 90, the rotation speed of the cot cover of the middle and upper control cot is equal to the rotation speed of the cot cover of the middle and upper pressing cot through the middle bridge gear. Under the action of the surface friction force field pressed down on the staple fiber, the external friction force field formed by the middle gripping feeding jaw on the staple roving is linearly distributed and extends backward in the rear stretching area.

7. A high-elastic yarn spinning method according to claim 6, characterized in that: The fiber strips output by the middle grip transition jaw are continuously gripped and conveyed by the front grip output jaw between the rubber roller sleeve of the front and rear upper pressing rubber rollers and the roller sleeve of the front lower roller. During this period, they are stretched by the front stretching zone between the middle grip transition jaw and the front grip output jaw to obtain a fiber belt. In the front stretching zone, the fiber strips output by the middle grip transition jaw first immediately enter the middle elastic transition control surface between the lower short leather ring supported by the elastic lower pin and the upper short leather ring supported by the elastic upper pin. In the elastically pressed middle elastic transition control surface, the elastic short fibers are subjected to adaptive stretching. The elastic control force makes the short fibers in the fiber strip be transported forward at a speed consistent with that of the middle holding transition jaw. When the short fibers in the fiber strip leave the middle holding feeding jaw, the short fibers are mutually embraced due to their own twist, and the short fibers in the fiber strip continue to be transported forward at a speed consistent with that of the middle holding transition jaw until they enter the front holding feeding jaw. The short fibers held by the front holding output jaw are immediately pulled out of the fiber strip, thereby obtaining a fiber band with the required linear density.

8. A high-elastic yarn spinning method according to claim 7, characterized in that: The fiber band continuously output through the front holding output jaw immediately enters the third control surface formed by the rubber roller sleeve of the rotating front upper control rubber roller. When the elongation of the short fibers in the staple roving is between 30% and 50%, the bottom end of the rubber roller sleeve of the front upper control rubber roller is set to be level with the front holding output jaw through the front bridge gear box, and the fiber band forms a line contact with the third control surface, thereby forming a line friction field in the process of the rubber roller sleeve of the rotating front upper control rubber roller and the fiber band in line contact, and the front bridge gear sets the rotational linear speed of the rubber roller sleeve of the front upper control rubber roller to be equal to the rotational linear speed of the rubber roller sleeve of the front upper pressing rubber roller, and the line friction field realizes a linearly distributed extension control effect on the short fibers in the fiber band, thereby realizing the linearly distributed forward extension of the external friction field formed by the front holding output jaw on the fiber band outside the drafting system, realizing the fiber The short fibers with relatively low elasticity in the fiber belt are twisted to gather the fibers on both sides toward the center under stable control. When the elongation of the short fibers in the staple roving is greater than 50%, the bottom end of the rubber roller sleeve of the front upper control rubber roller is located at the lower part of the front holding output jaw through the front bridge gear box, and the fiber belt forms a surface contact with the third control surface, thereby forming a surface friction field with a symmetrical arc surface distribution in the process of the rubber roller sleeve of the front upper control rubber roller and the fiber belt in surface contact, and the rotational linear speed of the rubber roller sleeve of the front upper control rubber roller is set by the front bridge gear to be equal to the rotational linear speed of the rubber roller sleeve of the front upper pressing rubber roller. Under the action of the downward surface friction field, the short fibers with relatively high elasticity are transported in a certain elongation state and the twisting is completed, thereby realizing the twisting effect of the short fibers with relatively high elasticity in the fiber belt to gather the fibers on both sides toward the center under stable control.

9. A high-elastic yarn spinning method according to claim 8, characterized in that: The fiber band output by the drafting system is converged and twisted at the twisting point under the action of twisting twist to obtain the required spun yarn. In this process, the main motor drives the spindle to rotate through the spindle belt, and then drives the bobbin to rotate. The rotation of the bobbin then drives the spun yarn to pass through the yarn guide hook and the wire ring in turn and wind around the bobbin, thereby driving the wire ring to rotate around the steel collar. At this time, due to the flexible structure of the spun yarn and the weight of the wire ring itself, the winding speed of the spun yarn on the bobbin is less than the rotation speed of the bobbin. The speed difference between the two produces twisting twist, which is transmitted from bottom to top. When it is transmitted to the twisting point, the fiber band is twisted under the action of the transmitted twist to obtain the final elastic yarn.

10. The high-elastic yarn spinning method according to claim 1, characterized in that: The roller shafts of the rear lower rollers at 20-24 spindle positions on the front or rear table of the spinning frame are integrated and fixedly connected, and the roller shafts of two adjacent rear lower rollers are connected through the rear roller seat. The roller shafts of the middle lower rollers at 14-16 spindle positions on the front or rear table of the spinning frame are integrated and fixedly connected, and the roller shafts of two adjacent middle lower rollers are connected through the middle roller seat. The roller shafts of the front lower rollers at 6-8 spindle positions on the front or rear table of the spinning frame are integrated and fixedly connected, and the roller shafts of two adjacent front lower rollers are connected through the front roller seat.

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