A high-elasticity yarn spinning method

Abstract

The application discloses a high-elasticity yarn spinning method, and adopts a high-elasticity yarn spinning device which comprises a back roller pair composed of a back lower roller and a back upper pressing rubber roller, a middle roller pair composed of a middle lower roller and a middle upper pressing rubber roller, and a front roller pair composed of a front lower roller and a front upper pressing rubber roller. A gear set transmission connection back upper control rubber roller is additionally arranged at the front part of the back upper pressing rubber roller, a gear set transmission connection middle upper control rubber roller is additionally arranged at the back part of the middle upper pressing rubber roller, and a gear set transmission connection front upper control rubber roller is additionally arranged at the front part of the front upper pressing rubber roller. The contact between the bottom of the rotating back upper control rubber roller, the middle upper control rubber roller and the front upper control rubber roller and the elastic fiber in the short fiber roving in the drafting zone is realized, the stable motion control of the fiber with greater elasticity in the drafting zone is realized, the drafting quality of the elastic fiber is improved, and the yarn quality is improved.

Description

Technical Field

[0001] This invention relates to the field of spinning technology, and in particular to a method for spinning high-elastic yarn. Background Technology

[0002] With the continuous advancement of the times, people's demands for clothing fabrics are constantly increasing. Currently, the textile and apparel industry is in an era of pursuing fashion, diversification, and high quality. Therefore, new requirements have been placed on the development of textile raw materials, and various new types of fibers are constantly being developed and applied to spinning processing. Drafting is a key step in spinning processing, involving the drawing, roving, and spinning processes. During drafting, fibers are gradually drawn out one by one from the surrounding fiber group. Due to mutual friction, hooks are gradually eliminated, and crimps are gradually straightened. In this way, the lateral connections remaining within each fiber can be completely eliminated, creating conditions for firmly establishing a regular end-to-end connection. Therefore, effective control of fibers during drafting is an important condition for achieving excellent drafting results. Changing the structure of the processed yarn through variations in drafting is an important way to develop multiple varieties in spinning, such as fancy yarns.

[0003] With the application of various new fiber raw materials, corresponding new requirements have been placed on drafting. This is particularly evident in the spinning of fibers with a certain degree of elasticity. During drafting, the control force generated on the fiber originates from friction, including the external friction generated by the drafting element after contact with the fiber, and the internal friction formed by the intertwining of fibers. The internal friction is mainly determined by factors such as the twist of the fed roving and the properties of the fibers within the roving, while the external friction is mainly generated by the drafting element. For fibers with high elasticity, their state within the roving is more complex, resulting in a correspondingly complex internal friction force. Furthermore, the fiber's own elasticity affects its speed control during drafting, further complicating the speed control. Therefore, for the production of high-elasticity yarn, the key lies in how to set up appropriate drafting elements to generate a corresponding external friction field, and in conjunction with a complex and changing internal friction field, to effectively control the fiber movement during drafting, thereby improving drafting efficiency and yarn quality. Summary of the Invention

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

[0005] This invention provides a high-elasticity yarn spinning method, comprising a rear roller pair consisting of a rear lower roller and a rear upper pressing roller, a middle roller pair consisting of a middle lower roller and a middle upper pressing roller, and a front roller pair consisting of a front lower roller and a front upper pressing roller. A rear upper control roller is provided at the rear of the rear upper pressing roller, a middle upper control roller is provided at the rear of the middle upper pressing roller, and a front upper control roller is provided at the front of the front upper pressing roller. The short fiber roving made of short fibers with an elongation of more than 30% is first subjected to a linear friction field or a surface friction field of a first control surface formed by the suspended and rotating rear upper control roller in the rear drafting zone, and then subjected to a linear friction field or a surface friction field of a second control surface formed by the suspended and rotating middle upper control roller, thereby achieving uniform adjustment of the twist of the short fiber roving or control of the movement speed of the short fibers, and producing a fiber sliver.

[0006] In the front stretching zone, the short fibers in the fiber strip are stretched by the adaptive elastic external friction field generated by the elastic transition control surface formed by the lower short rubber ring on the middle and lower roller and the upper short rubber ring on the middle and upper pressing rubber roller, and the internal friction field formed by the self-twist that makes the short fibers hug each other, thus producing a fiber strip.

[0007] The output fiber belt 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 performs a twisting action to gather the fibers on both sides towards the center, thus producing high elastic yarn.

[0008] In the high-elastic yarn spinning method described above, preferably, the rear upper pressing rubber roller, middle upper pressing rubber roller, front upper pressing rubber roller, rear upper control rubber roller, middle upper control rubber roller, and front upper control rubber roller have the same structure, including a rubber roller shaft. The rubber roller shaft is a solid cylindrical structure made of steel. Two adjacent spindles on the front or rear table of the spinning frame form a spindle group. Within a spindle group, the rubber roller shafts 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, and the middle upper control rubber roller are integrally and fixedly connected. The rubber roller shaft of the upper control rubber roller is integrally fixedly connected. The rubber roller shaft between the rubber roller sleeves of the two spindles in a spindle group is embedded in the rear embedded gripper of the pressure assembly; the rubber roller shaft between the rubber roller sleeves of the middle upper pressing rubber roller is embedded in the middle embedded gripper of the pressure assembly; and the rubber roller shaft between the rubber roller sleeves of the front upper pressing rubber roller is embedded in the front embedded gripper of the pressure assembly. A rubber roller sleeve is fitted on the rubber roller shaft corresponding to each spindle position. The rubber roller sleeve is made of rubber. A connecting cylinder is provided between the rubber roller sleeve and the rubber roller shaft. The material of the connecting cylinder is the same as that of the rubber roller shaft. The rubber roller sleeve is fitted onto the connecting cylinder, and the fitted rubber roller sleeve is in close pressing contact with the connecting cylinder through its own elasticity. The connecting cylinder and the rubber roller shaft are connected by a bearing.

[0009] In the high-elastic yarn spinning method described above, preferably, a corresponding rubber roller sleeve extends from the inward side of the connecting cylinder. The connecting cylinder of the rear upper pressing rubber roller and the connecting cylinder of the rear upper control rubber roller are connected by a rear bridge gear transmission. The rear bridge gear is disposed in a rear bridge gear box, which is embedded and connected to the rubber roller shafts of the rear upper pressing rubber roller and the rear upper control rubber roller, respectively. The connecting cylinder of the middle upper pressing rubber roller and the connecting cylinder of the middle upper control rubber roller are connected by a middle bridge gear transmission. The middle bridge gear is disposed in a middle bridge gear box, which is embedded and connected to the rubber roller shafts of the middle upper pressing rubber roller and the middle upper control rubber roller, respectively. The connecting cylinder of the front upper pressing rubber roller and the connecting cylinder of the front upper control rubber roller are connected by a front bridge gear transmission. The front bridge gear is disposed in a front bridge gear box, which is embedded and connected to the rubber roller shafts of the front upper pressing rubber roller and the front upper control rubber roller, respectively.

[0010] In the high-elastic yarn spinning method described above, preferably, a lower short apron is provided on the roller sleeve of the middle and lower rollers, and the lower short apron is threaded onto the roller sleeve of the middle and lower rollers through an elastic lower pin; an upper short apron is provided on the roller sleeve of the middle and upper pressing rubber rollers, and the upper short apron is threaded onto the rubber roller sleeve of the middle and upper rubber rollers through an elastic upper pin.

[0011] In the high-elasticity yarn spinning method described above, preferably, the short fiber roving is fed into the drafting system by a rear gripping feeding nip between the rubber roller sleeve of the upper rear pressing rubber roller and the roller sleeve of the lower rear roller. The rear-fed short fiber roving is continuously gripped and conveyed by a middle gripping transition nip between the rubber roller sleeve of the upper middle pressing rubber roller and the roller sleeve of the lower rear roller. During this period, it is subjected to the drafting action of the rear drafting zone between the rear gripping feeding nip and the middle gripping transition nip to obtain a fiber sliver.

[0012] In the rear drafting zone, the fed short-fiber roving first enters the first control surface formed by the roller sleeve of the rotating rear upper control roller. When the elongation of the short fibers in the short-fiber roving is between 30% and 50%, the bottom end of the roller sleeve of the rear upper control roller is kept horizontal with the rear gripping feeding jaw by the rear bridge gear box. The short-fiber roving forms line contact with the first control surface, thereby forming a linear friction field during the line contact process between the roller sleeve of the rotating rear upper control roller and the short-fiber roving. At this time, when the twist coefficient of the short-fiber roving is greater than 90, the rotational linear speed of the roller sleeve of the rear upper control roller is greater than that of the rear upper gripping feeding jaw by the rear bridge gear box. The rotational linear velocity of the rubber roller sleeve of the pressure roller and the linear friction field achieve the twisting effect on the short fibers in the short fiber roving. Under the twisting effect, the twist of the short fiber roving is spread along the length direction of the short fibers with relatively small elasticity. During the spread, the twist of the short fiber roving is uniformly adjusted. When the twist coefficient of the short fiber roving is less than 90, the rotational linear velocity of the rubber roller sleeve of the rear upper control rubber roller is set to be equal to the rotational linear velocity of the rubber roller sleeve of the rear upper pressing rubber roller through the rear bridge gear. Under the action of the linear friction field, the external friction field formed by the rear gripping feeding jaw on the short fiber roving is extended forward in a linear distribution in the rear drafting zone.

[0013] The fed short-fiber roving then enters the second control surface formed by the roller sleeve of the rotating upper control roller. The bottom end of the roller sleeve of the upper control roller is kept horizontal with the feeding jaw via the middle bridge gear box. The short-fiber roving forms line contact with the second control surface, thus creating a linearly distributed linear friction field during the line contact process between the roller sleeve of the upper control roller and the short-fiber roving. At this time, when the twist coefficient of the short-fiber roving is greater than 90, the rotational linear velocity of the roller sleeve of the upper control roller, set by the middle bridge gear, is less than the rotational linear velocity of the roller sleeve of the upper pressing roller but greater than that of the upper control roller. The rotational linear velocity and linear friction field achieve a secondary twisting effect on the short fibers in the short fiber roving. Under the twisting effect, the twist of the short fiber roving is propagated along the length direction of the short fibers with relatively low elasticity. During the propagation process, the twist of the short fiber roving is uniformly adjusted in two stages. When the twist coefficient of the short fiber roving is less than 90, the rotational speed of the rubber roller sleeve of the middle and upper control rubber roller is set by the middle bridge gear to be equal to the rotational speed of the rubber roller sleeve of the middle and upper pressing rubber roller. Under the action of the linear friction field, the external friction field formed by the middle gripping transition jaw on the short fiber roving is extended backward in a linear distribution within the rear drafting zone.

[0014] In the high-elasticity yarn spinning method described above, preferably, in the back drafting zone, when the elongation of the short fibers in the short fiber roving is greater than 50%, the bottom end of the rubber roller sleeve of the upper control rubber roller, set through the back bridge gear box, is located below the back gripping feed nip. The short fiber roving forms surface contact with the first control surface, thereby forming a symmetrically distributed surface friction force field during the surface contact between the rubber roller sleeve of the 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 rotational linear velocity of the rubber roller sleeve of the upper control rubber roller, set through the back bridge gear, is greater than the rotational linear velocity of the rubber roller sleeve of the upper pressing rubber roller. The speed, the surface friction field pressing down on the short fibers, achieves twist adjustment of the short fiber roving. Under the twist adjustment effect, the twist of the short fiber roving propagates along the length direction of the relatively elastic short fibers, achieving uniform twist adjustment during propagation. When the twist coefficient of the short fiber roving is less than 90, the rotational linear velocity of the upper control rubber roller sleeve, set by the rear bridge gear, is equal to the rotational linear velocity of the upper pressing rubber roller sleeve. Under the action of the surface friction field pressing down on the short fibers, the external friction field formed by the rear gripping feeding jaws on the short fiber roving extends forward in a linear distribution within the rear drafting zone; the feeding... The short-fiber roving then enters the second control surface formed by the roller sleeve of the rotating upper control roller. The bottom end of the roller sleeve of the upper control roller is positioned below the middle gripping feed jaw via a middle bridge gear box. The short-fiber roving forms surface contact with the second control surface, thus creating a symmetrically distributed surface friction field during the surface contact process between the roller sleeve of the upper control roller and the short-fiber roving. At this time, when the twist coefficient of the short-fiber roving is greater than 90, the rotational linear velocity of the roller sleeve of the upper control roller, set by the middle bridge gear, is less than the rotational linear velocity of the roller sleeve of the upper pressing roller but greater than the rotational linear velocity of the roller sleeve of the upper control roller. The speed, the surface friction field pressing down on the short fibers, achieves a secondary twisting effect on the short fiber roving. Under the twisting effect, the twist of the short fiber roving is spread along the length direction of the relatively elastic short fibers. During the spread, the twist of the short fiber roving is uniformly adjusted in two stages. When the twist coefficient of the short fiber roving is less than 90, the rotation speed of the upper control rubber roller sleeve is set by the middle bridge gear to be equal to the rotation speed of the upper pressing rubber roller sleeve. Under the action of the surface friction field pressing down on the short fibers, the external friction field formed by the middle gripping feeding jaw on the short fiber roving is linearly distributed and extends backward in the rear drafting zone.

[0015] In the high-elasticity yarn spinning method described above, preferably, the fiber sliver output from the central gripping transition nip is continuously gripped and conveyed by the front gripping output nip between the roller sleeves of the front and rear upper pressing rubber rollers and the roller sleeve of the front lower roller. During this process, it is stretched by the front drafting zone between the central gripping transition nip and the front gripping output nip to form a fiber strip. Within the front drafting zone, the fiber sliver output from the central gripping transition nip immediately enters the intermediate elastic transition control surface between the lower short apron supported by the elastic lower pin and the upper short apron supported by the elastic upper pin. Within the elastically pressed intermediate elastic transition control surface... The elastic short fibers are subject to adaptive elastic control force. Under the elastic control force, the short fibers in the fiber sliver are fed forward at the same speed as the middle gripping transition jaws. When the short fibers in the fiber sliver leave the middle gripping feed jaws, the internal friction force field formed by the short fibers binding together due to their own twist causes the short fibers in the fiber sliver to continue to be fed forward at the same speed as the middle gripping transition jaws until they enter the front gripping feed jaws. The short fibers held by the front gripping output jaws are immediately pulled out of the fiber sliver, thereby obtaining the fiber tape with the required linear density.

[0016] In the high-elasticity yarn spinning method described above, preferably, the fiber belt continuously output from the front gripping output nip immediately enters the third control surface formed by the roller sleeve of the rotating upper front control roller. When the elongation of the short fibers in the short fiber roving is between 30% and 50%, the bottom end of the roller sleeve of the upper front control roller is kept horizontal with the front gripping output nip by the front bridge gear box, and the fiber belt forms line contact with the third control surface. Thus, a linear friction field is formed during the line contact between the roller sleeve of the rotating upper front control roller and the fiber belt. Furthermore, the rotational linear velocity of the roller sleeve of the upper front control roller, set by the front bridge gear, is equal to the rotational linear velocity of the roller sleeve of the upper front pressing roller. This linear friction field achieves a linearly distributed elongation control effect on the short fibers in the fiber belt, thereby realizing the external friction field formed by the front gripping output nip on the fiber belt outside the drafting system. The forward extension of the linear distribution enables the twisting effect of relatively less elastic short fibers within the fiber belt, which causes the fibers on both sides to converge towards the center under stable control. When the elongation of the short fibers in the short fiber roving is greater than 50%, the bottom end of the rubber roller sleeve of the upper front control rubber roller is located below the front gripping output jaws through the front bridge gear box. The fiber belt forms surface contact with the third control surface, thereby forming a symmetrical arc-shaped surface friction force field during the surface contact process between the rubber roller sleeve of the upper front control rubber roller and the fiber belt. Furthermore, the rotational linear velocity of the rubber roller sleeve of the upper front control rubber roller, which is set through the front bridge gear, is equal to the rotational linear velocity of the rubber roller sleeve of the upper front pressing rubber roller. Under the action of the downward pressing surface friction force field, the relatively more elastic short fibers are conveyed and twisted while maintaining a certain elongation, thus achieving the twisting effect of relatively more elastic short fibers within the fiber belt, which causes the fibers on both sides to converge towards the center under stable control.

[0017] In the high-elasticity yarn spinning method described above, preferably, the fiber belt output from the drafting system is twisted at the twisting point under the action of twisting twist to obtain the desired fine yarn. During this process, the main motor drives the spindle to rotate via the spindle belt, which in turn drives the yarn tube to rotate. The rotation of the yarn tube then drives the fine yarn to pass through the guide hook and the traveler in sequence and wind onto the yarn tube, thereby driving the traveler to rotate around the ring. At this time, due to the flexible structure of the fine yarn and the weight of the traveler itself, the winding speed of the fine yarn on the yarn tube is less than the rotation speed of the yarn tube. The speed difference between the two generates the twisting twist, which is transmitted from bottom to top. When it is transmitted to the twisting point, the fiber belt is twisted under the action of the transmitted twist to obtain the final elastic yarn.

[0018] In the high-elasticity yarn spinning method described above, preferably, the roller shafts of the rear lower rollers of 20-24 spindles on the front or rear table of the spinning frame are integrally fixedly connected, and two adjacent rear lower rollers are connected by a rear roller seat; the roller shafts of the middle lower rollers of 14-16 spindles on the front or rear table of the spinning frame are integrally fixedly connected, and two adjacent middle lower rollers are connected by a middle roller seat; the roller shafts of the front lower rollers of 6-8 spindles on the front or rear table of the spinning frame are integrally fixedly connected, and two adjacent front lower rollers are connected by a front roller seat.

[0019] Compared with the prior art, the present invention adds a rear upper control roller connected by a gear set to the front of the rear upper pressing roller, a middle upper control roller connected by a gear set to the rear of the middle upper pressing roller, and a front upper control roller connected by a gear set to the front of the front upper pressing roller. This allows for stable motion control of the highly elastic fibers in the drafting zone through contact between the bottoms of the rotating rear upper control roller, middle upper control roller, and front upper control roller and the elastic fibers in the short fiber roving in the drafting zone. This improves the drafting quality of the elastic fibers and enhances the yarn quality. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the high-elasticity yarn spinning device provided in an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1 - Short fiber roving, 2 - Lower rear roller, 3 - Upper rear pressing roller, 4 - Upper rear control roller, 5 - Lower middle roller, 6 - Upper middle pressing roller, 7 - Upper middle control roller, 8 - Lower front roller, 9 - Upper front pressing roller, 10 - Upper front control roller, 11 - Roller shaft, 12 - Roller sleeve, 13 - Roller shaft, 14 - Roller sleeve, 15 - Rear cross-bridge gear, 16 - Middle cross-bridge gear, 17 - Front cross-bridge gear, 18 - First servo motor, 19 - Second servo motor, 20 - Third servo motor, 21 - Programmable logic controller, 22 - Yarn guide hook, 23 - Traveling wire, 24 - Steel ring, 25 - Yarn tube, 26 - Upper short apron, 27 - Lower short apron. Detailed Implementation

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

[0024] This invention provides a method for spinning high-elasticity yarn, utilizing a high-elasticity yarn spinning device, as described above. Figure 1 As shown, the high-elasticity yarn spinning device includes a drafting system. Along the fiber's movement direction within the drafting system from back to front, the drafting system includes a rear lower roller 2, a middle lower roller 5, and a front lower roller 8. The rear lower roller 2, middle lower roller 5, and front lower roller 8 have identical structures, including a roller shaft 11. The roller shaft 11 is a solid cylindrical structure made of steel. A roller sleeve 12 is fixedly fitted onto the roller shaft 11 corresponding to each spindle position. The roller sleeve 12 is integrally connected to the roller shaft 11, and the roller sleeve 12 and roller shaft 11 are made of identical materials. The front or rear table of the spinning frame has 2... The roller shafts 11 of the lower rear rollers 2 for 0-24 spindles are integrally fixedly connected, and two adjacent lower rear rollers 2 roller shafts 11 are connected by a rear roller seat. The roller shafts 11 of the middle lower rollers 5 for 14-16 spindles on the front or rear table of the spinning frame are integrally fixedly connected, and two adjacent middle lower rollers 5 roller shafts 11 are connected by a middle roller seat. The roller shafts 11 of the front lower rollers 8 for 6-8 spindles on the front or rear table of the spinning frame are integrally fixedly connected, and two adjacent front lower rollers 8 roller shafts 11 are connected by a front roller seat.

[0025] A rear upper pressing roller 3, a middle upper pressing roller 6, and a front upper pressing roller 9 are respectively arranged on the upper part of the rear lower roller 2, the middle lower roller 5, and the front lower roller 8. A rear upper control roller 4 is arranged in front of the rear upper pressing roller 3, located between the rear upper pressing roller 3 and the middle upper pressing roller 6. A middle upper control roller 7 is arranged behind the middle upper pressing roller 6, located between the rear upper control roller 4 and the middle upper pressing roller 6. A front upper control roller 10 is arranged in front of the front upper pressing roller 9. The rear upper pressing roller 3, the middle upper pressing roller 6, the front upper pressing roller 9, the rear upper control roller 4, the middle upper control roller 7, and the front upper control roller 10 have the same structure, including a roller shaft 13. The roller shaft 13 is... The solid cylindrical structure, with the rubber roller shaft 13 made of steel, forms a spindle group consisting of two adjacent spindles on the front or rear table of the spinning machine. Within a spindle group, the rubber roller shafts 13 of 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 are all integrally fixedly connected. The rubber roller shaft 13 between the rubber roller sleeves 14 of the rear upper pressing rubber rollers 3 of the two spindles within a spindle group is embedded in the rear embedded gripper of the pressure assembly. The rubber roller shaft 13 between the rubber roller sleeves 14 of the 6th roller is embedded in the middle embedded gripper of the pressure assembly. The rubber roller shaft 13 between the rubber roller sleeves 14 of the front upper pressing rubber roller 9 is embedded in the front embedded gripper of the pressure assembly. A rubber roller sleeve 14 is fitted on the rubber roller shaft 13 corresponding to each spindle position. The rubber roller sleeve 14 is made of rubber. A connecting cylinder is provided between the rubber roller sleeve 14 and the rubber roller shaft 13. The material of the connecting cylinder is the same as that of the rubber roller shaft 13. The rubber roller sleeve 14 is fitted onto the connecting cylinder, and the fitted rubber roller sleeve 14 is in tight pressing contact with the connecting cylinder through its own elasticity. The connecting cylinder and the rubber roller shaft 13 are connected by a bearing. The corresponding rubber roller sleeve 14 extends out of the inward side of the connecting cylinder. The connecting cylinder of the rear upper pressing rubber roller 3 and the connecting cylinder of the rear upper control rubber roller 4 are connected by a rear upper pressing rubber roller 3. A bridge gear 15 is used for transmission connection. The rear bridge gear 15 is housed in a rear bridge gear 15 housing. The rear bridge gear 15 housing is embedded and connected to the roller shaft 13 of the rear upper pressing roller 3 and the roller shaft 13 of the rear upper control roller 4. The connecting cylinder of the middle upper pressing roller 6 and the connecting cylinder of the middle upper control roller 7 are connected via a middle bridge gear 16. The middle bridge gear 16 is housed in a middle bridge gear 16 housing. The middle bridge gear 16 housing is embedded and connected to the roller shaft 13 of the middle upper pressing roller 6 and the roller shaft 13 of the middle upper control roller 7. The connecting cylinder of the front upper pressing roller 9 and the connecting cylinder of the front upper control roller 10 are connected via a front bridge gear 17. The front bridge gear 17 is housed in a front bridge gear 17 housing.The front cross gear 17 is embedded and connected to 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, respectively.

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

[0027] The roller shaft 11 of the rear lower roller 2 is driven to rotate by the first servo motor 18, the roller shaft 11 of the middle lower roller 5 is driven to rotate by the second servo motor 19, and the roller shaft 11 of the front lower 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] In use, the pressure assembly is pressed down, causing the roller sleeve 14 of the upper rear pressing roller 3 and the roller sleeve 12 of the lower rear roller 22 to make tight pressing contact. This forms a rear gripping jaw between the roller sleeve 14 of the upper rear pressing roller 3 and the roller sleeve 12 of the lower rear roller 2, causing the upper short rubber ring 26 on the roller sleeve 14 of the upper middle pressing roller 6 and the lower short rubber ring 27 on the roller sleeve 12 of the lower middle roller 5 to make tight pressing contact. This forms a middle gripping jaw between the two, and the lower short rubber ring supported by the elastic lower pin... The ring 27 and the upper short leather ring 26 supported by the elastic upper pin are pressed into close contact, thereby forming a medium elastic control surface between the two, so that the rubber roller sleeve 14 of the front upper pressing rubber roller 9 and the roller sleeve 12 of the front lower roller 8 are pressed into close contact, thereby forming a front gripping jaw between the rubber roller sleeve 14 of the front upper pressing rubber roller 9 and the roller sleeve 12 of the pressed front lower roller 8, while at this time the bottom of the rubber roller sleeve 14 of the rear upper control rubber roller 4, the middle upper control rubber roller 7, and the front upper control rubber roller 10 is in a non-pressed contact suspended state.

[0029] The first servo motor 18 drives the roller shaft 11 of the lower rear roller 2 to rotate, thereby driving the roller sleeve 12 of the lower rear roller 2, which is integrated with it, to rotate synchronously. The rotation of the roller sleeve 12 of the lower rear roller 2 then drives the rubber roller sleeve 14 of the upper rear pressing rubber roller 3, which is in close contact with it, to rotate. This, in turn, drives the connecting cylinder, which is in close contact with the rubber roller sleeve 14 of the upper rear pressing rubber roller 3, to rotate, thereby changing the rear gripping jaw into a rear gripping feeding jaw. The rotation of the connecting cylinder of the upper rear pressing rubber roller 3 then drives the connecting cylinder of the upper rear control rubber roller 4 to rotate through the rear bridge gear 15. This, in turn, drives the rubber roller sleeve 14 of the upper rear control rubber roller 4, which is in close contact with it, to rotate. This causes the lower circular surface of the rotating rubber roller sleeve 14 of the upper rear control rubber roller 4, which is in a suspended state at this time, to form the first control surface for fiber control.

[0030] The second servo motor 19 drives the roller shaft 11 of the lower roller 5 to rotate, thereby driving the roller sleeve 12 of the lower roller 5, which is integrally connected to it, to rotate synchronously. The rotation of the roller sleeve 12 of the lower roller 5 then drives the lower short rubber ring 27, which is tightly fitted with it, to rotate. The rotation of the lower short rubber ring 27 then drives the upper short rubber ring 26, which is tightly pressed with it, to rotate. This, in turn, drives the rubber roller sleeve 14 of the upper pressing rubber roller 6, which is tightly fitted with it, to rotate. This, in turn, drives the connecting roller sleeve 14, which is tightly pressed with the rubber roller sleeve 14 of the upper pressing rubber roller 6, to rotate. The connecting cylinder rotates, thereby changing the middle gripping jaw to the middle gripping transition jaw, and changing the middle elastic control surface to the middle elastic transition control surface. The connecting cylinder of the middle upper pressing rubber roller 6 rotates, which in turn drives the connecting cylinder of the middle upper control rubber roller 7 to rotate through the middle bridge gear 16. This, in turn, drives the rubber roller sleeve 14 of the middle upper control rubber roller 7, which is in close pressing contact with it, to rotate. As a result, the lower circular surface of the rotating rubber roller sleeve 14 of the middle upper control rubber roller 7, which is 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 lower front roller 8 to rotate, thereby driving the roller sleeve 12 of the lower front roller 8, which is integrated with it, to rotate synchronously. The rotation of the roller sleeve 12 of the lower front roller 8 then drives the rubber roller sleeve 14 of the upper front pressing rubber roller 9, which is in close contact with it, to rotate. This, in turn, drives the connecting cylinder, which is in close contact with the rubber roller sleeve 14 of the upper front pressing rubber roller 9, to rotate, thereby changing the front gripping jaws into front gripping output jaws. The rotation of the connecting cylinder of the upper front pressing rubber roller 9 then drives the connecting cylinder of the upper front control rubber roller 10 to rotate through the front bridge gear 17. This, in turn, drives the rubber roller sleeve 14 of the upper front control rubber roller 10, which is in close contact with it, to rotate. This causes the lower circular surface of the rotating rubber roller sleeve 14 of the upper front control rubber roller 10, which is in a suspended state at this time, to form a third control surface for fiber control.

[0032] During spinning, the desired short fiber roving 11 is selected and fed into the drafting system, and the elongation of the short fibers in the short fiber roving 1 is above 30%. At this time, the short fiber roving 1 is fed into the drafting system by the rear gripping feeding nip 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. The short fiber roving 1 fed in later is continuously gripped and conveyed by the middle gripping transition nip. During this period, it is subjected to the drafting action of the rear drafting zone between the rear gripping feeding nip and the middle gripping transition nip to obtain a fiber sliver.

[0033] In the rear drafting zone, the fed short fiber roving 1 first enters the first control surface formed by the roller sleeve 14 of the rotating rear upper control 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 roller sleeve 14 of the rear upper control roller 4 is kept horizontal with the rear gripping feeding jaw by the rear bridge gear 15. The short fiber roving 1 forms line contact with the first control surface, thereby forming a line friction field during the line contact process between the roller sleeve 14 of the rotating rear upper control 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 rotational linear speed of the roller sleeve 14 of the rear upper control roller 4 is set by the rear bridge gear 15. The linear speed of the roller sleeve 14 of the upper pressing roller 3 is greater than the rotational linear speed of the roller sleeve 14. The linear friction field achieves twist adjustment on the short fibers in the short fiber roving 1. Under the twist adjustment, the twist of the short fiber roving 1 is propagated along the length direction of the short fibers with relatively low elasticity. During the propagation process, the twist of the short fiber roving 1 is uniformly adjusted. When the twist coefficient of the short fiber roving 1 is less than 90, the rotational linear speed of the roller sleeve 14 of the upper control roller 4 is set to be equal to the rotational linear speed of the roller sleeve 14 of the upper pressing roller 3 through the rear bridge gear 15. Under the action of the linear friction field, the external friction field formed by the rear gripping feeding jaw on the short fiber roving 1 is linearly distributed in the rear drafting zone. The fabric extends forward; the fed short fiber roving 1 then enters the second control surface formed by the roller sleeve 14 of the rotating upper control roller 7. The bottom end of the roller sleeve 14 of the upper control roller 7 is kept horizontal with the middle gripping feeding jaw via the middle bridge gear 16. The short fiber roving 1 forms line contact with the second control surface, thus forming a linearly distributed linear friction field during the line contact between the roller sleeve 14 of the upper control 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 rotational linear speed of the roller sleeve 14 of the upper control roller 7, set by the middle bridge gear 16, is less than and greater than the rotational linear speed of the roller sleeve 14 of the upper pressing roller 6. The linear speed of the upper control roller 4 and the linear friction field achieve a secondary twisting effect on the short fibers in the short fiber roving 1. Under the twisting effect, the twist of the short fiber roving 1 is spread along the length direction of the short fibers with relatively low elasticity. During the spread, the twist of the short fiber roving 1 is uniformly adjusted. When the twist coefficient of the short fiber roving 1 is less than 90, the rotation speed of the roller sleeve 14 of the upper control roller 7 is set to be equal to the rotation speed of the roller sleeve 14 of the upper pressing roller 6 through the middle bridge gear 16. Under the action of the linear friction field, the external friction field formed by the middle gripping transition jaw on the short fiber roving 1 is extended backward in a linear distribution in the rear drafting zone.

[0034] When the elongation of the short fibers in the short fiber roving 1 is greater than 50%, the bottom end of the rubber roller sleeve 14 of the rear upper control rubber roller 4, set by the rear bridge gear 15, is located below the rear gripping feeding jaw. The short fiber roving 1 forms surface contact with the first control surface, thereby forming a symmetrical arc-shaped surface friction force field during the surface contact between the rubber roller sleeve 14 of the 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 rotational linear velocity of the rubber roller sleeve 14 of the rear upper control rubber roller 4, set by the rear bridge gear 15, is greater than the rotational linear velocity of the rubber roller sleeve 14 of the rear upper pressing rubber roller 3. The surface friction force field pressing down on the short fiber affects the short fiber roving 1. The twist adjustment function is achieved, which causes the twist of the short fiber roving 1 to propagate along the length direction of the relatively elastic short fiber. During the propagation process, the twist of the short fiber roving 1 is uniformly adjusted. When the twist coefficient of the short fiber roving 1 is less than 90, the rotational linear velocity of the roller sleeve 14 of the rear upper control roller 4 is set to be equal to the rotational linear velocity of the roller sleeve 14 of the rear upper pressing roller 3 through the rear bridge gear 15. Under the action of the surface friction field of the downward pressing of the short fiber, the external friction field formed by the rear gripping feeding jaw on the short fiber roving 1 extends forward in a linear distribution within the rear drafting zone. The fed short fiber roving 1 then enters the rotating middle upper control roller. The second control surface is formed by the rubber roller sleeve 14 of roller 7, and the bottom end of the rubber roller sleeve 14 of the upper control roller 7 is located below the middle gripping feeding jaw through the middle bridge gear 16. The short fiber roving 1 forms a surface contact with the second control surface, thereby forming a surface friction force field with a symmetrical arc distribution during the surface contact between the rubber roller sleeve 14 of the upper control 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 rotational linear velocity of the rubber roller sleeve 14 of the upper control roller 7 is less than the rotational linear velocity of the rubber roller sleeve 14 of the upper pressing roller 6 and greater than the rotational linear velocity of the rubber roller sleeve 14 of the upper control roller 4. The surface friction field pressing down on the short fibers achieves a secondary twisting effect on the short fiber roving 1. Under the twisting effect, the twist of the short fiber roving 1 is propagated along the length direction of the relatively elastic short fibers. During the propagation process, the twist of the short fiber roving 1 is uniformly adjusted in two stages. When the twist coefficient of the short fiber roving 1 is less than 90, the rotation speed of the rubber roller sleeve 14 of the middle and upper control rubber roller 7 is set to be equal to the rotation speed of the rubber roller sleeve 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 short fibers, the external friction field formed by the middle gripping feeding jaw on the short fiber roving 1 is linearly distributed and extends backward in the rear drafting zone.

[0035] The fiber sliver output from the middle gripping transition jaw is continuously gripped and fed by the front gripping output jaw. During this process, it is stretched by the front stretching zone between the middle gripping transition jaw and the front gripping output jaw to form a fiber strip. In the front stretching zone, the fiber sliver output from the middle gripping 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 adaptive elastic control force. Under the elastic control force, the short fibers in the fiber sliver are fed forward at the same speed as the middle gripping transition jaw. When the short fibers in the fiber sliver leave the middle gripping feed jaw, under the action of the internal friction force field formed by the short fibers binding together due to their own twist, the short fibers in the fiber sliver continue to be fed forward at the same speed as the middle gripping transition jaw until they enter the front gripping feed jaw. The short fibers gripped by the front gripping output jaw are immediately pulled out from the fiber sliver, thereby obtaining a fiber strip with the required linear density.

[0036] The fiber belt continuously output from the front gripping output jaws immediately enters the third control surface formed by the roller sleeve 14 of the rotating front upper control roller 10. When the elongation of the short fibers in the short fiber roving 1 is between 30% and 50%, the bottom end of the roller sleeve 14 of the front upper control roller 10 is kept horizontal with the front gripping output jaws by the front bridge gear 17. The fiber belt forms line contact with the third control surface, thereby forming a line friction field during the line contact between the roller sleeve 14 of the rotating front upper control roller 10 and the fiber belt. The rotational linear velocity of the roller sleeve 14 of the front upper control roller 10 is set by the front bridge gear 17 to be equal to the rotational linear velocity of the roller sleeve 14 of the front upper pressing roller 9. The line friction field achieves a linearly distributed extension control effect on the short fibers in the fiber belt, thereby realizing the linearly distributed forward extension of the external friction field formed by the front gripping output jaws on the fiber belt outside the drafting system. The relatively elastic short fibers in the fiber belt are twisted towards the center under stable control. When the elongation of the short fibers in the short fiber roving 1 is greater than 50%, the bottom end of the rubber roller sleeve 14 of the front upper control rubber roller 10 is located below the front gripping output jaw through the front bridge gear 17 box. The fiber belt forms a surface contact with the third control surface. Thus, a surface friction force field with a symmetrical arc distribution is formed during the surface contact between the rubber roller sleeve 14 of the front upper control rubber roller 10 and the fiber belt. The rotational linear speed of the rubber roller sleeve 14 of the front upper control rubber roller 10 is equal to the rotational linear speed of the rubber roller sleeve 14 of the front upper pressing rubber roller 9. Under the action of the downward pressing surface friction force field, the relatively elastic short fibers are conveyed and twisted under a certain elongation state, realizing the twisting effect of the relatively elastic short fibers in the fiber belt converging towards the center under stable control.

[0037] The fiber belt output by the drafting system is twisted at the twisting point under the action of the twisting twist to obtain the desired fine yarn. During this process, the main motor drives the spindle to rotate through the spindle belt, which in turn drives 25 to rotate. The rotation of 25 then drives the fine yarn to pass through the guide hook 22 and the wire traveler 23 in sequence and wind onto 25. This causes the wire traveler 23 to rotate around the ring 24. At this time, due to the flexible structure of the fine yarn and the weight of the wire traveler 23 itself, the winding speed of the fine yarn on 25 is less than the rotation speed of 25. The speed difference between the two generates the twisting twist. The generated twisting twist is transmitted from bottom to top. When it is transmitted to the twisting point, the fiber belt is twisted under the action of the transmitted twist to obtain the final elastic yarn.

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

Claims

1. A method for spinning high-elastic yarn, comprising a rear roller pair consisting of a rear lower roller and a rear upper pressing roller, a middle roller pair consisting of a middle lower roller and a middle upper pressing roller, and a front roller pair consisting of a front lower roller and a front upper pressing roller, characterized in that: A rear upper control roller with a rear bridge gear drive is set at the rear of the rear upper pressing roller, a middle upper control roller with a middle bridge gear drive is set at the rear of the middle upper pressing roller, and a front upper control roller with a front bridge gear drive is set at the front of the front upper pressing roller. Short fiber roving made of short fibers with an elongation of more than 30% is first subjected to the linear friction field or surface friction field of the first control surface formed by the suspended and rotating rear upper control roller in the rear drafting zone, and then subjected to the linear friction field or surface friction field of the second control surface formed by the suspended and rotating middle upper control roller. This achieves uniform adjustment of the twist of the short fiber roving or control of the movement speed of the short fibers, and produces fiber sliver. In the front stretching zone, the short fibers in the fiber strip are stretched by the adaptive elastic external friction field generated by the elastic transition control surface formed by the lower short rubber ring on the middle and lower roller and the upper short rubber ring on the middle and upper pressing rubber roller, and the internal friction field formed by the self-twist that makes the short fibers hug each other, thus producing a fiber strip. The output fiber belt 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 performs a twisting action to gather the fibers on both sides towards the center, thus producing high elastic yarn. The rear upper pressing rubber roller, middle upper pressing rubber roller, front upper pressing rubber roller, rear upper control rubber roller, middle upper control rubber roller, and front upper control rubber roller have the same structure, including a rubber roller shaft. The rubber roller shaft is a solid cylindrical structure made of steel. Two adjacent spindles on the front or rear table of the spinning frame form a spindle group. Within a spindle group, the rubber roller shafts of the rear upper pressing rubber roller, middle upper pressing rubber roller, front upper pressing rubber roller, rear upper control rubber roller, middle upper control rubber roller, and front upper control rubber roller are all integrally and fixedly connected. The rubber roller shafts of the upper and middle pressing rubber rollers in a set of two spindles are embedded in the rear embedded gripper of the pressure assembly; the rubber roller shafts of the upper and middle pressing rubber rollers are embedded in the middle embedded gripper of the pressure assembly; and the rubber roller shafts of the upper and middle pressing rubber rollers are embedded in the front embedded gripper of the pressure assembly. A rubber roller sleeve is fitted on the corresponding rubber roller shaft of each spindle. The rubber roller sleeve is made of rubber. A connecting cylinder is provided between the rubber roller sleeve and the rubber roller shaft. The material of the connecting cylinder is the same as that of the rubber roller shaft. The rubber roller sleeve is fitted onto the connecting cylinder, and the fitted rubber roller sleeve is in close pressing contact with the connecting cylinder through its own elasticity. The connecting cylinder and the rubber roller shaft are connected by a bearing. The connecting cylinder extends into the corresponding rubber roller sleeve on its inward side. The connecting cylinder of the rear upper pressing rubber roller and the connecting cylinder of the rear upper control rubber roller are connected by a rear cross gear. The rear cross gear is set in the rear cross gear box, which is embedded and connected to the rubber roller shafts of the rear upper pressing rubber roller and the rear upper control rubber roller, respectively. The connecting cylinder of the middle upper pressing rubber roller and the connecting cylinder of the middle upper control rubber roller are connected by a middle cross gear. The middle cross gear is set in the middle cross gear box, which is embedded and connected to the rubber roller shafts of the middle upper pressing rubber roller and the middle upper control rubber roller, respectively. The connecting cylinder of the front upper pressing rubber roller and the connecting cylinder of the front upper control rubber roller are connected by a front cross gear. The front cross gear is set in the front cross gear box, which is embedded and connected to the rubber roller shafts of the front upper pressing rubber roller and the front upper control rubber roller, respectively.

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

3. The method for spinning high-elastic yarn according to claim 1, characterized in that: The short fiber roving is fed into the drafting system by the rear gripping feed nip between the rubber roller sleeve of the upper rear pressing rubber roller and the roller sleeve of the lower rear roller. The short fiber roving fed in is continuously gripped and conveyed by the middle gripping transition nip between the rubber roller sleeve of the upper middle pressing rubber roller and the roller sleeve of the lower rear roller. During this period, it is stretched by the rear drafting zone between the rear gripping feed nip and the middle gripping transition nip to obtain fiber sliver. In the rear drafting zone, the fed short-fiber roving first enters the first control surface formed by the roller sleeve of the rotating rear upper control roller. When the elongation of the short fibers in the short-fiber roving is between 30% and 50%, the bottom end of the roller sleeve of the rear upper control roller is kept horizontal with the rear gripping feeding jaw by the rear bridge gear box. The short-fiber roving forms line contact with the first control surface, thereby forming a line friction field during the line contact process between the roller sleeve of the rotating rear upper control roller and the short-fiber roving. At this time, when the twist coefficient of the short-fiber roving is greater than 90, the rotational linear speed of the roller sleeve of the rear upper control roller is greater than that of the rear upper gripping feeding jaw by the rear bridge gear box. The rotational linear velocity of the rubber roller sleeve of the pressure roller and the linear friction field achieve the twisting effect on the short fibers in the short fiber roving. Under the twisting effect, the twist of the short fiber roving is spread along the length direction of the short fibers with relatively small elasticity. During the spread, the twist of the short fiber roving is uniformly adjusted. When the twist coefficient of the short fiber roving is less than 90, the rotational linear velocity of the rubber roller sleeve of the rear upper control rubber roller is set to be equal to the rotational linear velocity of the rubber roller sleeve of the rear upper pressing rubber roller through the rear bridge gear. Under the action of the linear friction field, the external friction field formed by the rear gripping feeding jaw on the short fiber roving is extended forward in a linear distribution in the rear drafting zone. The fed short-fiber roving then enters the second control surface formed by the roller sleeve of the rotating upper control roller. The bottom end of the roller sleeve of the upper control roller is kept horizontal with the feeding jaw via the middle bridge gear box. The short-fiber roving forms line contact with the second control surface, thus creating a linearly distributed linear friction field during the line contact process between the roller sleeve of the upper control roller and the short-fiber roving. At this time, when the twist coefficient of the short-fiber roving is greater than 90, the rotational linear velocity of the roller sleeve of the upper control roller, set by the middle bridge gear, is less than the rotational linear velocity of the roller sleeve of the upper pressing roller but greater than that of the upper control roller. The rotational linear velocity and linear friction field achieve a secondary twisting effect on the short fibers in the short fiber roving. Under the twisting effect, the twist of the short fiber roving is propagated along the length direction of the short fibers with relatively low elasticity. During the propagation process, the twist of the short fiber roving is uniformly adjusted in two stages. When the twist coefficient of the short fiber roving is less than 90, the rotational speed of the rubber roller sleeve of the middle and upper control rubber roller is set by the middle bridge gear to be equal to the rotational speed of the rubber roller sleeve of the middle and upper pressing rubber roller. Under the action of the linear friction field, the external friction field formed by the middle gripping transition jaw on the short fiber roving is extended backward in a linear distribution within the rear drafting zone.

4. The high-elasticity yarn spinning method according to claim 3, characterized in that: In the rear drafting zone, when the elongation of the short fibers in the short fiber roving is greater than 50%, the bottom end of the rubber roller sleeve of the rear upper control rubber roller, set through the rear bridge gear box, is located below the rear gripping feed jaw. The short fiber roving forms surface contact with the first control surface, thereby forming a symmetrically distributed surface friction force field during the surface contact process between the 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 rotational linear velocity of the rubber roller sleeve of the rear upper control rubber roller, set through the rear bridge gear, is greater than the rotational linear velocity of the rubber roller sleeve of the rear upper pressing rubber roller. The surface friction force field pressing down on the short fiber exerts a force on the short fiber. The roving achieves twist adjustment, causing the twist of the short-fiber roving to propagate along the length of the relatively elastic short fibers. During this propagation, the twist of the short-fiber roving is uniformly adjusted. When the twist coefficient of the short-fiber roving is less than 90, the linear velocity of the upper control roller sleeve, set by the rear bridge gear, is equal to the linear velocity of the upper pressing roller sleeve. Under the action of the surface friction field pressing down on the short fibers, the external friction field formed by the rear gripping feeding jaws on the short-fiber roving extends forward in a linear distribution within the rear drafting zone; the fed short-fiber roving then enters the rotating... The upper control roller sleeve forms a second control surface, and the bottom end of the upper control roller sleeve is positioned below the middle gripping feed jaw via the middle bridge gear box. The short fiber roving forms surface contact with the second control surface, thus creating a symmetrically distributed surface friction field during the surface contact between the upper control roller sleeve and the short fiber roving. When the twist coefficient of the short fiber roving is greater than 90, the rotational linear velocity of the upper control roller sleeve, set by the middle bridge gear, is less than the rotational linear velocity of the upper pressing roller sleeve but greater than the rotational linear velocity of the upper control roller sleeve. This provides a suitable surface for the short fiber roving. The surface friction field of the downward pressure on the short fiber roving achieves a secondary twisting effect. Under the twisting effect, the twist of the short fiber roving is propagated along the length direction of the relatively elastic short fiber. During the propagation process, the twist of the short fiber roving is uniformly adjusted in two stages. When the twist coefficient of the short fiber roving is less than 90, the rotation speed of the upper control rubber roller sleeve is set by the middle bridge gear to be equal to the rotation speed of the upper pressing rubber roller sleeve. Under the action of the surface friction field of the downward pressure on the short fiber, the external friction field formed by the middle gripping feeding jaw on the short fiber roving is linearly distributed and extends backward in the rear drafting zone.

5. The high-elasticity yarn spinning method according to claim 4, characterized in that: The fiber strip output from the middle gripping transition jaw is continuously gripped and conveyed by the front gripping output jaw between the roller sleeves of the front and rear upper pressing rubber rollers and the roller sleeve of the front lower roller. During this process, it is stretched by the front stretching zone between the middle gripping transition jaw and the front gripping output jaw to form a fiber belt. In the front stretching zone, the fiber strip output from the middle gripping transition jaw first immediately enters the middle elastic transition control surface between the lower short rubber ring supported by the elastic lower pin and the upper short rubber ring supported by the elastic upper pin. Within the elastic pressing middle elastic transition control surface, the elastic short fibers are adaptively... The elastic control force ensures that the short fibers in the fiber sliver are fed forward at the same speed as the middle gripping transition jaws. When the short fibers in the fiber sliver leave the middle gripping feed jaws, the internal friction force field formed by the twist of the fibers causing them to bind together continues to be fed forward at the same speed as the middle gripping transition jaws until they enter the front gripping feed jaws. The short fibers held by the front gripping output jaws are immediately pulled out of the fiber sliver, thus obtaining the fiber tape with the required linear density.

6. The method for spinning high-elastic yarn according to claim 5, characterized in that: The fiber belt continuously output from the front gripping output jaws immediately enters the third control surface formed by the roller sleeve of the rotating upper front control roller. When the elongation of the short fibers in the short fiber roving is between 30% and 50%, the bottom end of the roller sleeve of the upper front control roller is kept horizontal with the front gripping output jaws by the front cross gear box. The fiber belt forms line contact with the third control surface, thereby generating a linear friction field during the line contact between the roller sleeve of the rotating upper front control roller and the fiber belt. Furthermore, the rotational linear velocity of the roller sleeve of the upper front control roller is equal to the rotational linear velocity of the roller sleeve of the upper front pressing roller by the front cross gear. This linear friction field achieves a linearly distributed extension control effect on the short fibers in the fiber belt, thus realizing the linearly distributed forward extension of the external friction field formed by the front gripping output jaws on the fiber belt outside the drafting system, achieving fiber... The relatively inelastic short fibers within the fiber belt undergo a twisting effect where the fibers on both sides converge towards the center under stable control. When the elongation of the short fibers in the short fiber roving is greater than 50%, the bottom end of the rubber roller sleeve of the upper front control rubber roller, set through the front bridge gear box, is located below the front gripping output jaw. The fiber belt forms surface contact with the third control surface, thereby forming a symmetrical arc-shaped surface friction force field during the surface contact process between the rubber roller sleeve of the upper front control rubber roller and the fiber belt. Furthermore, the rotational linear velocity of the rubber roller sleeve of the upper front control rubber roller, set through the front bridge gear, is equal to the rotational linear velocity of the rubber roller sleeve of the upper front pressing rubber roller. Under the action of the downward pressing surface friction force field, the relatively elastic short fibers are conveyed while maintaining a certain elongation and completing the twisting process, thus achieving the twisting effect where the relatively elastic short fibers within the fiber belt converge towards the center under stable control.

7. A method for spinning high-elastic yarn according to claim 6, characterized in that: The fiber belt output by the drafting system is twisted at the twisting point under the action of the twisting twist to obtain the desired fine yarn. During this process, the main motor drives the spindle to rotate through the spindle belt, which in turn drives the yarn tube to rotate. The rotation of the yarn tube then drives the fine yarn to pass through the guide hook and the wire traveler in sequence and wind onto the yarn tube, thereby driving the wire traveler to rotate around the ring. At this time, due to the flexible structure of the fine yarn and the weight of the wire traveler itself, the winding speed of the fine yarn on the yarn tube is less than the rotation speed of the yarn tube. The speed difference between the two generates the twisting twist. The generated twisting twist is transmitted from bottom to top. When it is transmitted to the twisting point, the fiber belt is twisted under the action of the transmitted twist to obtain the final elastic yarn.

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

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