CN109652879B

CN109652879B - Single-spindle double-drafting spinning device and spinning method thereof

Info

Publication number: CN109652879B
Application number: CN201910061146.XA
Authority: CN
Inventors: 宋娟; 苏旭中; 刘新金
Original assignee: Jiangnan University
Current assignee: Jiangnan University
Priority date: 2019-01-23
Filing date: 2019-01-23
Publication date: 2021-07-06
Anticipated expiration: 2039-01-23
Also published as: CN109652879A

Abstract

The invention discloses a single-spindle double-drafting spinning device and a spinning method thereof, wherein the right ends of a front lower roller shaft and a rear lower roller shaft are respectively driven by a first motor and a second motor, a middle lower roller sleeve comprises a left roller sleeve and a right roller sleeve, the left roller sleeve is fixedly connected with the roller shaft, the right roller sleeve is connected with the roller shaft through a bearing and is driven by a transmission shaft through a belt, the rear roller shaft and the middle lower roller shaft are driven through a first gear set, the transmission shaft and the front lower roller shaft are driven through a second gear set, a first roving and a second roving are respectively drafted through a left rear drafting zone and a right rear drafting zone after being pressed and fed through a rear drafting roller pair, and then are drafted through the left front drafting zone and the right front drafting zone to obtain a first fiber strand and a second fiber strand, thereby realizing the drafting processes of the first roving and the second roving which are drafted and distributed in the front drafting feeding zone and the rear drafting zones under the same total draft multiple, realizing the double different drafting processes of the same spindle position according, thereby optimizing the spinning process and improving the comprehensive quality of the finished yarn.

Description

Single-spindle double-drafting spinning device and spinning method thereof

Technical Field

The invention belongs to the technical field of spinning, and relates to a novel ring spinning technology, in particular to a single-spindle double-drafting spinning device and a spinning method thereof.

Background

With the continuous progress of the times, the requirements of people on the garment materials are continuously improved, and the textile garment industry is in an age of pursuing fashion, diversification and high quality at present. Therefore, new requirements are also put forward on the development of textile raw materials and textile processes. Among them, the high quality and performance of textiles and the cleanliness of production and processing become the main development directions of modern textile industry, and are also effective ways to improve the grade and added value of products. With the improvement of modern living standard and the acceleration of work rhythm, the high shape-preserving property and easy care property of textiles become important attributes and remarkable marks of high-quality fabrics and clothes. However, the shape retention of the current fabrics made of different fiber materials has many problems, such as the cotton fabrics are easy to wrinkle when worn, the flatness is poor after washing and drying, ironing is needed, the wool fabrics are easy to felt when machine washing, the fabric pleat shape retention is poor, the chemical fiber fabrics are easy to arch and shape retention when worn, and the like. The practical problems of insufficient shape retention, unstable shape retention effect, difficult control of environmental protection index of the prior shape retention technology to meet the standard and the like become serious obstacles for high quality of textiles and can not meet the requirements of people in modern society on high-quality dressing. The development of key preparation technology of high-shape-retaining textiles and the realization of industrial application thereof are important ways and industry consensus for improving the textile quality and the international market competitiveness in China.

The composite wrapping yarn is a yarn with a structure produced by mutually compounding different fibers, and the control of the structure and the performance of the yarn can be realized by controlling the fiber composite structure in spinning, so that the required yarn production is realized. But the prior spinning process is limited, so that the comprehensive quality of the finished yarn is low.

Disclosure of Invention

The technical problem to be solved is as follows: in order to overcome the defects of the prior art, the invention provides a single-spindle double-drafting spinning device and a spinning method thereof, wherein the single-spindle double-drafting spinning device adopts a roller sleeve of a middle-lower roller and a rubber roller sleeve of an upper middle rubber roller which are in a bilateral symmetry structure, so that the drafting process of a first fed roving and a second fed roving under the drafting distribution in different front and rear drafting zones under the same total drafting multiple is realized, and then the different drafting processes of double rovings fed to the same spindle position according to the requirements are realized, thereby optimizing the spinning process and improving the comprehensive quality of finished yarns.

The technical scheme is as follows: the single-spindle double-drafting spinning device comprises a drafting system, the drafting system comprises a rear drafting roller pair, a middle drafting roller pair and a front drafting roller pair, the rear drafting roller pair comprises a rear lower roller and a rear upper rubber roller, the middle drafting roller pair comprises a middle lower roller and a middle upper rubber roller, the front drafting roller pair comprises a front lower roller and a front upper rubber roller, the rear lower roller, the middle lower roller and the front lower roller all comprise roller shafts, the roller shafts of the rear lower rollers of all spindle positions on the front vehicle table of a spinning machine are integrally and fixedly connected, the roller shafts of the middle lower rollers of all spindle positions are integrally and fixedly connected, the roller shafts of the rear lower rollers of all spindle positions on the rear vehicle table of the spinning machine are integrally and fixedly connected, the roller shafts of the middle lower rollers of all spindle positions are integrally and fixedly connected, the roller shafts of the front lower rollers of all spindle positions are integrally and fixedly connected, a roller sleeve is arranged on the outer circumference of the roller shaft; the roller sleeve of the middle and lower roller is divided into a left roller sleeve and a right roller sleeve, the left roller sleeve is fixedly connected with the roller shaft in an integrated mode, the right roller sleeve is connected with the roller shaft in a sliding mode through a first middle bearing, the left end of the right roller sleeve is fixedly connected with a driving sleeve, the driving sleeve is sleeved on the roller shaft between the left roller sleeve and the right roller sleeve of the middle and lower roller, the right end of the driving sleeve is fixedly connected with the left end of the right roller sleeve, a space is reserved between the left end of the driving sleeve and the right end of the left roller sleeve, and the driving sleeve is in transmission connection with the transmission shaft through a belt; the transmission shafts of all spindle positions of the front trolley table of a spinning frame are integrally connected, the transmission shafts of all spindle positions of the rear trolley table of the spinning frame are integrally connected, the left end and the right end of each transmission shaft are respectively connected and fixed on a frame of the spinning frame through bearings, the right end of a roller shaft of a front lower roller is driven to rotate through a first motor, the right end of each transmission shaft is in transmission connection with the right end of a roller shaft of a front lower roller through a first connecting gear set, the right end of a roller shaft of a rear lower roller is driven to rotate through a second motor, and the right end of a roller shaft of a middle lower roller is in transmission connection with the right end of a roller shaft of a rear front lower roller through a second connecting gear set; the rear gluing roller, the middle gluing roller and the front gluing roller comprise gluing roller shafts; a spindle group is formed by a rear lathe table board of a spinning frame, a spindle position of a front lathe table board and a spindle position adjacent to the right side, the rubber roll shafts of rear gluing rolls on two spindle positions of the spindle group are integrally connected, the rubber roll shaft of an upper middle gluing roll is integrally connected, the rubber roll shaft of a front gluing roll is integrally connected, a rubber roll sleeve is tightly sleeved on the outer circumference of the rubber roll shaft of the rear gluing roll, the upper middle gluing roll and the front gluing roll of each spindle position, the rubber roll sleeve of the rear gluing roll is consistent with the roller sleeve of a rear lower roller in length and the left end and the right end are aligned, the rubber roll sleeve of the rear gluing roll is connected with the rubber roll shaft of the rear gluing roll through a second middle bearing, the rubber roll sleeve of the front gluing roll is consistent with the roller sleeve of the front lower roller in length and the left end and the right end are aligned, the rubber roll sleeve of the front gluing roll is connected with the rubber roll shaft of the front gluing roll through a third middle bearing, the rubber, the left rubber roller sleeve of the middle and upper rubber roller is consistent with the left roller sleeve of the middle and lower roller in length, the left end and the right end of the middle and upper rubber roller are aligned, the right rubber roller sleeve of the middle and upper rubber roller is consistent with the right roller sleeve of the middle and lower roller in length, the left rubber roller sleeve of the middle and upper rubber roller is aligned with the left end and the right end of the middle and lower roller, the left rubber roller sleeve of the middle and upper rubber roller is connected with the rubber roller shaft of the middle and upper rubber roller through a fourth middle bearing, and the right rubber roller sleeve; a rubber roll shaft between the rubber roll sleeves of the rear upper rubber roll, the middle upper rubber roll and the front upper rubber roll of two spindle positions of one spindle position group is sequentially embedded into a rear embedding grab, a middle embedding grab and a front embedding grab of a pressurizing assembly from back to front, so that the rear upper rubber roll, the middle upper rubber roll and the front upper rubber roll are mounted on the pressurizing assembly, the rear part of the pressurizing assembly is fixed on a platform surface of a spinning frame through a fixing shaft, the pressurizing assembly rotates along the fixing shaft, and the rear upper rubber roll, the middle upper rubber roll and the front upper rubber roll are pressed down under certain pressure in the rotating process.

Preferably, the roller shaft is of a solid cylindrical structure.

Preferably, the roller shaft and the roller sleeve are made of the same material and are both made of iron or steel.

Preferably, the left roller sleeve and the right roller sleeve are the same in length, and a gap is reserved between the left roller sleeve and the right roller sleeve.

Preferably, the material of the driving sleeve is the same as that of the right roller sleeve, and the driving sleeve is of a cylindrical hollow structure with two open ends.

Preferably, the drive shaft is of solid cylindrical construction.

Preferably, the rubber roll shaft is made of iron materials and is of a solid cylindrical structure.

Preferably, the rubber roller sleeve is made of rubber.

In the spinning method of the single-spindle double-draft spinning device, when the single-spindle double-draft spinning device is used, the pressurizing assembly rotates along the fixed shaft under the action of force, so that the pressurizing assembly is pressed downwards, the rubber roll sleeve of the rear upper rubber roll at each spindle position is in tight pressing contact with the roller sleeve of the rear lower roller, the left rubber roll sleeve and the right rubber roll sleeve of the upper middle rubber roll are respectively in tight pressing contact with the left roller sleeve and the right roller sleeve of the middle lower roller, the rubber roll sleeve of the front upper rubber roll is in tight pressing contact with the roller sleeve of the front lower roller, the first motor drives the roller shaft of the front lower roller to rotate, then drives the roller sleeve of the front lower roller which is integrally and fixedly connected with the roller shaft of the front lower roller to synchronously rotate, the roller shaft of the front lower roller rotates, then drives the transmission shaft to rotate through the first connecting gear set, the transmission shaft rotates to drive the right roller sleeve of the middle lower roller to rotate through the belt, the right roller sleeve of the middle lower roller rotates to drive the right rubber covered roller sleeve of the middle upper rubber covered roller which is tightly pressed and contacted with the right roller sleeve of the middle lower roller to synchronously rotate, a right front drafting area is formed between the front drafting roller pair and a middle right drafting roller pair consisting of the right roller sleeve of the middle lower roller and the right rubber covered roller sleeve of the middle upper rubber covered roller, and the drafting multiple of the right front drafting area is fixed and equal to the gear ratio of the first connecting gear set; the second motor drives the roller shaft of the rear lower roller to rotate, then drives the roller sleeve of the rear lower roller which is fixedly connected with the roller shaft of the rear lower roller in an integrated manner to synchronously rotate, the roller sleeve of the rear lower roller rotates and then drives the rubber roller sleeve of the rear upper rubber roller which is tightly pressed and contacted with the roller sleeve of the rear lower roller to synchronously rotate, the roller shaft of the rear lower roller rotates and then drives the roller shaft of the middle lower roller to rotate through a second connecting gear set, the roller shaft of the middle lower roller rotates and then drives the left roller sleeve of the middle lower roller which is fixedly connected with the roller shaft of the middle lower roller in an integrated manner to synchronously rotate, the left roller sleeve of the middle lower roller rotates and then drives the left rubber roller sleeve of the middle upper rubber roller which is tightly pressed and contacted with the left roller sleeve of the middle lower roller to synchronously rotate, and at the moment, a left rear traction area is formed between the middle left traction roller pair consisting of the rear traction roller pair and the left roller sleeve of the middle lower, the draft multiple of the left rear draft zone is fixed and equal to the gear ratio of the second connecting gear set, meanwhile, a right rear draft zone is formed between a middle right draft roller pair consisting of a rear draft roller pair and a right roller sleeve of a middle lower roller and a right rubber roller sleeve of a middle upper rubber roller, the draft multiple of the right rear draft zone is equal to the total draft multiple between the rear draft roller pair and a front draft roller pair divided by the draft multiple of the right front draft zone, a left front draft zone is formed between a front draft roller pair and a middle left draft roller pair consisting of a left roller sleeve of the middle lower roller and a left rubber roller sleeve of the middle upper rubber roller, and the draft multiple of the left front draft zone is equal to the total draft multiple between the rear draft roller pair and the front roller pair divided by the draft multiple of the left rear draft zone; a feeding horn mouth device is additionally arranged at the rear part of the rear drafting roller pair, the feeding horn mouth device comprises a left horn mouth and a right horn mouth, the left horn mouth and the right horn mouth are fixedly connected through a connecting cross rod, a distance is reserved between the left horn mouth and the right horn mouth, first roving is fed into the drafting system through the left horn mouth, second roving is fed into the drafting system through the right horn mouth, the fed first roving is pressed and fed between a roller sleeve of the rear lower roller and a rubber roller sleeve of the rear gluing roller, then the fed first roving is pressed and fed between the left roller sleeve of the middle lower roller and a left rubber roller sleeve of the middle upper rubber roller, the fed first roving is pressed and fed between the roller sleeve of the front lower roller and the rubber roller sleeve of the front upper rubber roller, the fed second roving is pressed and fed between the roving sleeve of the rear lower roller and the rubber roller sleeve of the rear gluing roller Then the second roving is pressed and output between a right roller sleeve of a middle lower roller and a right rubber roller sleeve of a middle upper rubber roller, in the process, the second roving is subjected to the drafting action of a right rear drafting zone to obtain a second fiber bundle, the second fiber bundle is pressed and output between the roller sleeve of a front lower roller and the rubber roller sleeve of a front upper rubber roller, in the process, the second fiber bundle is subjected to the drafting action of a right front drafting zone to obtain a second fiber strip, and therefore the total drafting multiples of the fed first roving and the fed second roving in the drafting system are the same; the first fiber strip and the second fiber strip are continuously output under the drive of the rotation of the front drafting roller pair, the first fiber strip and the second fiber strip output by the drafting system interact to form yarn under the action of twisting twist, and according to the properties of the output first fiber strip and the second fiber strip, when the twisting direction of the twisting twist is Z twisting, the interaction yarn forming process comprises four kinds, wherein the first fiber strip positioned on the left side wraps the second fiber strip positioned on the right side to form yarn, and the first fiber strip and the second fiber strip respectively perform twisting action in the wrapping process; the second one is that the first fiber strip on the left side is firstly twisted and then is wrapped into yarn by the second fiber strip on the right side, and the two fiber strips respectively perform twisting action simultaneously in the wrapping process; the third is that the first fiber strip on the left side and the second fiber strip on the right side are directly merged and intertwined with each other to form yarn, the second fiber strip on the right side is gradually wrapped by the first fiber strip on the left side in the intertwining process, and the two fiber strips are twisted simultaneously in the intertwining process; the fourth step is that the first fiber strip on the left side and the second fiber strip on the right side are firstly twisted respectively and then are mutually wound into yarn, and the second fiber strip which is twisted primarily on the right side is gradually wrapped by the first fiber strip which is twisted primarily on the left side in the winding process; when the twisting direction of twisting twist is S twist, the action process of interaction yarn formation at the moment comprises four kinds, the first kind is that the second fiber strip positioned at the right side wraps the second fiber strip positioned at the left side to form yarn, and the two carry out twisting action respectively in the wrapping process; the second is that the second fiber strip on the right side is firstly twisted and then is wrapped into yarn by the first fiber strip on the left side, and the two fiber strips respectively perform twisting action simultaneously in the wrapping process; the third is that the first fiber strip on the left side and the second fiber strip on the right side are directly merged and intertwined with each other to form yarn, the first fiber strip on the left side is gradually wrapped by the second fiber strip on the right side in the intertwining process, and the first fiber strip and the second fiber strip are twisted simultaneously in the intertwining process; and the fourth method is that the first fiber strip on the left side and the second fiber strip on the right side are twisted respectively firstly and then are twisted with each other to form yarn, and the first fiber strip which is subjected to preliminary twisting on the left side is gradually wrapped by the second fiber strip which is subjected to preliminary twisting on the right side in the winding process.

Preferably, the draft multiple of the front draft zone and the draft multiple of the rear draft zone to which the first roving is subjected are the same or different, the draft distribution in the front and rear draft zones is different, and the draft distribution in the front and rear draft zones includes three cases, the first case is that the product of the gear ratio of the first connecting gear set and the gear ratio of the second connecting gear set is equal to the total draft multiple between the rear draft roller pair and the front draft roller pair, that is, the product of the draft multiple of the left rear draft zone and the draft multiple of the right front draft zone to which the second roving is subjected is equal to the total draft multiple, the draft multiple of the left rear draft zone to which the first roving is subjected in the rear draft zone is equal to the draft multiple of the right rear draft zone to which the second roving is subjected in the rear draft zone, and the draft multiple of the left front draft zone to which the first roving is subjected in the front draft zone is equal to the draft multiple of the right front draft zone to which the second roving is subjected to the front draft zone, that is, the drafting times of the front drafting area and the rear drafting area are the same, so that the first roving and the second roving are subjected to the same drafting process in the drafting system; the second condition is that the product of the gear ratio of the first connecting gear set and the gear ratio of the second connecting gear set is smaller than the total draft multiple between the back draft roller pair and the front draft roller pair, namely the product of the draft multiple of the back left draft area and the draft multiple of the front right draft area is smaller than the total draft multiple, at the moment, the draft multiple of the back left draft area received by the first roving in the back draft area is smaller than the draft multiple of the back right draft area received by the second roving in the back draft area, the draft multiple of the front left draft area received by the first roving in the front draft area is larger than the draft multiple of the front right draft area received by the second roving in the front draft area, namely the total draft multiple received by the first roving and the second roving is the same, the drafting times of the front drafting area and the rear drafting area are different, so that the first roving and the second roving are subjected to different drafting processes in the drafting system; the third condition is that the product of the gear ratio of the first connecting gear set and the gear ratio of the second connecting gear set is larger than the total draft multiple between the back draft roller pair and the front draft roller pair, namely the product of the draft multiple of the back left draft area and the draft multiple of the front right draft area is larger than the total draft multiple, at the moment, the draft multiple of the back left draft area received by the first roving in the back draft area is larger than the draft multiple of the back right draft area received by the second roving in the back draft area, the draft multiple of the front left draft area received by the first roving in the front draft area is smaller than the draft multiple of the front right draft area received by the second roving in the front draft area, namely the total draft multiples received by the first roving and the second roving are the same, the drafting times of the front drafting area and the rear drafting area are different, so that the first roving and the second roving are subjected to different drafting processes in the drafting system.

Has the advantages that: the single-spindle double-drafting spinning device and the spinning method thereof adopt the roller sleeve of the middle-lower roller and the rubber roller sleeve of the middle-upper rubber roller which are in bilateral symmetry structures, realize the drafting process under the drafting distribution of the fed first roving and the fed second roving in different front and rear drafting areas under the same total drafting multiple, and further realize the different drafting processes of the fed double rovings at the same spindle position according to the requirements, thereby optimizing the spinning process and improving the comprehensive quality of finished yarns.

Drawings

FIG. 1 is a schematic view of a single-spindle double-draft spinning device according to the present invention;

the roller comprises a rear lower roller 1, a rear upper rubber roller 2, a middle lower roller 3, a middle upper rubber roller 4, a front lower roller 5, a front upper rubber roller 6, a roller shaft 7, a roller sleeve 8, a rubber roller sleeve 9, a rubber roller shaft 10, a left rubber roller sleeve 11, a right rubber roller sleeve 12, a left roller sleeve 13, a right roller sleeve 14, a first middle bearing 15, a belt 16, a transmission shaft 17, a first motor 18, a first connecting gear set 19, a second connecting gear set 20, a second motor 21, a first roving 22, a second roving 23 and a driving sleeve 24.

Detailed Description

The following examples further illustrate the present invention but are not to be construed as limiting the invention. Modifications and substitutions to methods, procedures, or conditions of the invention may be made without departing from the spirit and substance of the invention. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art.

Example 1

As shown in fig. 1, the single-spindle double-drafting spinning device comprises a drafting system, the drafting system comprises a rear drafting roller pair, a middle drafting roller pair and a front drafting roller pair, the rear drafting roller pair comprises a rear lower roller 1 and a rear upper gluing roller 2, the middle drafting roller pair comprises a middle lower roller 3 and a middle upper gluing roller 4, the front drafting roller pair comprises a front lower roller 5 and a front upper gluing roller 6, the rear lower roller 1, the middle lower roller 3 and the front lower roller 5 all comprise roller shafts 7, the roller shafts 7 of the rear lower rollers 1 of all spindle positions of a front vehicle table of a spinning machine are integrally and fixedly connected, the roller shafts 7 of the middle lower rollers 3 of all spindle positions are integrally and fixedly connected, the roller shafts 7 of the rear lower rollers 1 of all spindle positions of the rear vehicle table of the spinning machine are integrally and fixedly connected, the roller shafts 7 of the middle lower rollers 3 of all spindle positions are integrally and fixedly connected, The roller shafts 7 of the front lower rollers 5 at all spindle positions are integrally and fixedly connected, and the outer circumference of each roller shaft 7 is provided with a roller sleeve 8; the roller sleeve 8 of the middle and lower roller 3 is divided into a left roller sleeve 13 and a right roller sleeve 14, the left roller sleeve 13 is fixedly connected with the roller shaft 7 in an integrated manner, the right roller sleeve 14 is connected with the roller shaft 7 in a sliding manner through a first middle bearing 15, the left end of the right roller sleeve 14 is fixedly connected with a driving sleeve 24, the driving sleeve 24 is sleeved on the roller shaft 7 between the left roller sleeve 13 and the right roller sleeve 14 of the middle and lower roller 3, the right end of the driving sleeve 24 is fixedly connected with the left end of the right roller sleeve 14, a gap is reserved between the left end of the driving sleeve 24 and the right end of the left roller sleeve 13, and the driving sleeve 24 is in transmission connection with a transmission shaft 17 through a belt 16; the transmission shafts 17 of all spindle positions of the front trolley table of a spinning frame are integrally connected, the transmission shafts 17 of all spindle positions of the rear trolley table of the spinning frame are integrally connected, the left end and the right end of each transmission shaft 17 are respectively connected and fixed on a frame of the spinning frame through bearings, the right end of the roller shaft 7 of the front lower roller 5 is driven to rotate through a first motor 18, the right end of each transmission shaft 17 is in transmission connection with the right end of the roller shaft 7 of the front lower roller 5 through a first connecting gear set 19, the right end of the roller shaft 7 of the rear lower roller 1 is driven to rotate through a second motor 21, and the right end of the roller shaft 7 of the middle lower roller 3 is in transmission connection with the right end of the roller shaft 7 of the rear front lower roller through a second connecting gear set 20; the rear upper gluing roller 2, the middle upper gluing roller 4 and the front upper gluing roller 6 all comprise a gluing roller shaft 10; a spindle group is formed by a rear lathe table surface of a spinning frame, a spindle position of a front lathe table surface and a spindle position adjacent to the right side, a spindle position group is formed by integrally connecting rubber roll shafts 10 of rear gluing rollers 2 on two spindle positions, integrally connecting rubber roll shafts 10 of upper middle gluing rollers 4 and a rubber roll shaft 10 of a front gluing roller 6, a rubber roll sleeve 9 is tightly sleeved on the outer circumference of the rubber roll shaft 10 of the rear gluing roller 2, the upper middle gluing roller 4 and the front gluing roller 6 of each spindle position, the rubber roll sleeve 9 of the rear gluing roller 2 is consistent with the roller sleeve 8 of a rear lower roller 1 in length, the left end and the right end of the rubber roll sleeve are aligned, the rubber roll sleeve 9 of the rear gluing roller 2 is connected with the rubber roll shaft 10 of the rear gluing roller 2 through a second intermediate bearing, the rubber roll sleeve 9 of the front gluing roller 6 is consistent with the roller sleeve 8 of the front lower roller 5 in length, the left end and the right end of the rubber roll sleeve 9 of the front gluing roller 6 are aligned, the, the rubber roll sleeve 9 of the middle and upper rubber roll 4 is divided into a left rubber roll sleeve 11 and a right rubber roll sleeve 12, the left rubber roll sleeve 11 of the middle and upper rubber roll 4 is consistent with the left roller sleeve 13 of the middle and lower roller 3 in length, the left and right ends of the left rubber roll sleeve 11 of the middle and upper rubber roll 4 are aligned, the right rubber roll sleeve 12 of the middle and upper rubber roll 4 is consistent with the right roller sleeve 14 of the middle and lower roller 3 in length, the left and right ends of the left rubber roll sleeve 11 of the middle and upper rubber roll 4 are aligned, the left rubber roll sleeve 11 of the middle and upper rubber roll 4 is connected with the rubber roll shaft 10 of the middle and upper rubber roll 4 through a fourth; a glue roller shaft 10 between a back glue roller 2, a middle and upper glue roller 4 and a glue roller sleeve 9 of a front glue roller 6 of two spindle positions of one spindle position group is sequentially embedded into a back embedding grab, a middle embedding grab and a front embedding grab of a pressurizing assembly from back to front, so that the back glue roller 2, the middle and upper glue roller 4 and the front glue roller 6 are installed on the pressurizing assembly, the rear part of the pressurizing assembly is fixed on a platform surface of a spinning frame through a fixed shaft, the pressurizing assembly rotates along the fixed shaft, and the back glue roller 2, the middle and upper glue roller 4 and the front glue roller 6 are pressed down under certain pressure in the rotating process.

The roller shaft 7 is of a solid cylindrical structure.

The roller shaft 7 and the roller sleeve 8 are made of the same material and are made of iron or steel.

The left roller sleeve 13 and the right roller sleeve 14 are the same in length, and a gap is reserved between the left roller sleeve and the right roller sleeve.

The material of the driving sleeve 24 is the same as that of the right roller sleeve 14, and the driving sleeve 24 is a cylindrical hollow structure with two open ends.

The drive shaft 17 is of solid cylindrical construction.

The rubber roll shaft 10 is made of iron and has a solid cylindrical structure.

The rubber roller sleeve 9 is made of rubber.

In the spinning method of any one of the single-spindle double-drafting spinning devices, when in use, the pressurizing assembly rotates along the fixed shaft under the action of force, so that the pressurizing assembly is pressed downwards, the rubber roll sleeve 9 of the rear upper rubber roll 2 of each spindle position is in tight pressing contact with the roller sleeve 8 of the rear lower roller 1, the left rubber roll sleeve 11 and the right rubber roll sleeve 12 of the upper middle rubber roll 4 are respectively in tight pressing contact with the left roller sleeve 13 and the right roller sleeve 14 of the middle lower roller 3, the rubber roll sleeve 9 of the front upper rubber roll 6 is in tight pressing contact with the roller sleeve 8 of the front lower roller 5, the first motor 18 drives the roller shaft 7 of the front lower roller 5 to rotate, then drives the roller sleeve 8 of the front lower roller 5 which is integrally and fixedly connected with the roller shaft 7 of the front lower roller 5 to rotate synchronously, the roller sleeve 8 of the front lower roller 5 drives the rubber roll sleeve 9 of the front upper rubber roll 6 which is in tight pressing contact with the roller sleeve 8 of the front lower roller 5 to rotate synchronously, the roller shaft 7 of the front lower roller 5 rotates to drive the transmission shaft 17 to rotate through the first connecting gear set 19, the transmission shaft 17 rotates to drive the right roller sleeve 14 of the middle lower roller 3 to rotate through the belt 16, the right roller sleeve 14 of the middle lower roller 3 rotates to drive the right rubber roller sleeve 14 of the middle upper rubber roller 4 which is tightly pressed and contacted with the right roller sleeve 14 of the middle lower roller 3 to synchronously rotate, at the moment, a right front drafting zone is formed between the front drafting roller pair and a middle right drafting roller pair consisting of the right roller sleeve 14 of the middle lower roller 3 and the right rubber roller sleeve 12 of the middle upper rubber roller 4, and the drafting multiple of the right front drafting zone is fixed and equal to the gear ratio of the first connecting gear set 19; the second motor 21 drives the roller shaft 7 of the rear lower roller 1 to rotate, then drives the roller sleeve 8 of the rear lower roller 1 which is fixedly connected with the roller shaft 7 of the rear lower roller 1 in an integrated manner to rotate synchronously, the roller sleeve 8 of the rear lower roller 1 rotates, then drives the rubber roller sleeve 9 of the rear upper rubber roller 2 which is tightly pressed and contacted with the roller sleeve 8 of the rear lower roller 1 to rotate synchronously, the roller shaft 7 of the rear lower roller 1 rotates, then drives the roller shaft 7 of the middle lower roller 3 to rotate through the second connecting gear set 20, the roller shaft 7 of the middle lower roller 3 rotates, then drives the left roller sleeve 13 of the middle lower roller 3 which is fixedly connected with the roller shaft 7 of the middle lower roller 3 in an integrated manner to rotate, the left roller sleeve 13 of the middle lower roller 3 rotates, then drives the left rubber roller sleeve 11 of the middle upper rubber roller 4 which is tightly pressed and contacted with the left roller sleeve 13 of the middle lower roller 3 to rotate synchronously, and the rollers are simultaneously connected with the middle drafting roller sleeve 11 which is formed by the left roller sleeve 13 of the middle lower roller sleeve 3 and the middle roller sleeve 13 of the middle lower A left rear drafting zone is formed between the roller pairs, the drafting multiple of the left rear drafting zone is fixed and is equal to the gear ratio of the second connecting gear set 20, meanwhile, a right rear drafting zone is formed between a middle right drafting roller pair consisting of the rear drafting roller pair and a right roller sleeve 14 of the middle lower roller 3 and a right rubber roller sleeve 12 of the middle upper rubber roller 4, the drafting multiple of the right rear drafting zone is equal to the total drafting multiple between the rear drafting roller pair and the front drafting roller pair divided by the drafting multiple of the right front drafting zone, a left front zone is formed between a middle left roller drafting pair consisting of the front drafting roller pair and a middle left roller sleeve 11 consisting of a left roller sleeve 13 of the middle lower roller 3 and a left rubber roller sleeve 11 of the middle upper rubber roller 4, and the drafting multiple of the left front drafting zone is equal to the total drafting multiple between the rear drafting roller pair and the front drafting roller pair divided by the drafting multiple of the left rear drafting zone; a feeding horn mouth device is additionally arranged at the rear part of the rear drafting roller pair, the feeding horn mouth device comprises a left horn mouth and a right horn mouth, the left horn mouth and the right horn mouth are fixedly connected through a connecting cross rod, a distance is reserved between the left horn mouth and the right horn mouth, first roving 22 is fed into the drafting system through the left horn mouth, second roving 23 is fed into the drafting system through the right horn mouth, the fed first roving 22 is fed in a pressing mode through a roller sleeve 8 of a rear lower roller 1 and a rubber roller sleeve 9 of a rear upper gluing roller 2, then the fed first roving 22 is output through a pressing mode through a left roller sleeve 13 of a middle lower roller 3 and a left rubber roller sleeve 11 of an upper middle gluing roller 4, in the process, the first roving 22 is subjected to the drafting effect of a left rear drafting area to obtain a first fiber bundle, then the first fiber bundle is output through a pressing mode through a roller sleeve 8 of a front lower roller 5 and a rubber roller sleeve 9 of a front upper gluing roller 6, and in the process, the first fiber bundle, the fed second roving 23 is pressed and fed between the roller sleeve 8 of the rear lower roller 1 and the rubber roller sleeve 9 of the rear upper rubber roller 2, and then is pressed and output between the right roller sleeve 14 of the middle lower roller 3 and the right rubber roller sleeve 12 of the middle upper rubber roller 4, in the process, the second roving 23 is subjected to the drafting action of a right rear drafting zone to obtain a second fiber bundle, the second fiber bundle is pressed and output between the roller sleeve 8 of the front lower roller 5 and the rubber roller sleeve 9 of the front upper rubber roller 6, in the process, the second fiber bundle is subjected to the drafting action of a right front drafting zone to obtain a second fiber strip, and therefore the total drafting multiples of the fed first roving 22 and the fed second roving 23 in a drafting system are the same; the first fiber strip and the second fiber strip are continuously output under the drive of the rotation of the front drafting roller pair, the first fiber strip and the second fiber strip output by the drafting system interact to form yarn under the action of twisting twist, and according to the properties of the output first fiber strip and the second fiber strip, when the twisting direction of the twisting twist is Z twisting, the interaction yarn forming process comprises four kinds, wherein the first fiber strip positioned on the left side wraps the second fiber strip positioned on the right side to form yarn, and the first fiber strip and the second fiber strip respectively perform twisting action in the wrapping process; the second one is that the first fiber strip on the left side is firstly twisted and then is wrapped into yarn by the second fiber strip on the right side, and the two fiber strips respectively perform twisting action simultaneously in the wrapping process; the third is that the first fiber strip on the left side and the second fiber strip on the right side are directly merged and intertwined with each other to form yarn, the second fiber strip on the right side is gradually wrapped by the first fiber strip on the left side in the intertwining process, and the two fiber strips are twisted simultaneously in the intertwining process; the fourth step is that the first fiber strip on the left side and the second fiber strip on the right side are firstly twisted respectively and then are mutually wound into yarn, and the second fiber strip which is twisted primarily on the right side is gradually wrapped by the first fiber strip which is twisted primarily on the left side in the winding process; when the twisting direction of twisting twist is S twist, the action process of interaction yarn formation at the moment comprises four kinds, the first kind is that the second fiber strip positioned at the right side wraps the second fiber strip positioned at the left side to form yarn, and the two carry out twisting action respectively in the wrapping process; the second is that the second fiber strip on the right side is firstly twisted and then is wrapped into yarn by the first fiber strip on the left side, and the two fiber strips respectively perform twisting action simultaneously in the wrapping process; the third is that the first fiber strip on the left side and the second fiber strip on the right side are directly merged and intertwined with each other to form yarn, the first fiber strip on the left side is gradually wrapped by the second fiber strip on the right side in the intertwining process, and the first fiber strip and the second fiber strip are twisted simultaneously in the intertwining process; and the fourth method is that the first fiber strip on the left side and the second fiber strip on the right side are twisted respectively firstly and then are twisted with each other to form yarn, and the first fiber strip which is subjected to preliminary twisting on the left side is gradually wrapped by the second fiber strip which is subjected to preliminary twisting on the right side in the winding process.

However, the draft multiple of the front draft zone and the draft multiple of the rear draft zone are the same or different, the draft distribution in the front and rear draft zones is different, including three cases, the first case is that the product of the gear ratio of the first connecting gear set 19 and the gear ratio of the second connecting gear set 20 is equal to the total draft multiple between the rear draft roller pair and the front draft roller pair, that is, the product of the draft multiple of the left rear draft zone and the draft multiple of the right front draft zone is equal to the total draft multiple, at this time, the draft multiple of the left rear draft zone to which the first roving 22 is subjected in the rear draft zone is equal to the draft multiple of the right rear draft zone to which the second roving 23 is subjected in the rear draft zone, the draft multiple of the left front draft zone to which the first roving 22 is subjected in the front draft zone is equal to the draft multiple of the right front draft zone to which the second roving 23 is subjected in the front draft zone, that is, that the total draft multiples of the first roving 22 and the second roving 23 are the same, the draft multiple of the front draft zone and the draft multiple of the rear draft zone are the same, so that the first roving 22 and the second roving 23 are subjected to the same draft process in the draft system; the second case is that the product of the gear ratio of the first connecting gear set 19 and the gear ratio of the second connecting gear set 20 is smaller than the total draft multiple between the rear draft roller pair and the front draft roller pair, that is, the product of the draft multiple of the rear left draft zone and the draft multiple of the front right draft zone is smaller than the total draft multiple, at this time, the draft multiple of the rear left draft zone received by the first roving 22 in the rear draft zone is smaller than the draft multiple of the rear right draft zone received by the second roving 23 in the rear draft zone, the draft multiple of the front left draft zone received by the first roving 22 in the front draft zone is larger than the draft multiple of the front right draft zone received by the second roving 23 in the front draft zone, that is, the total draft received by the first roving 22 and the second roving 23 is the same, but the draft multiple of the front draft zone received by the front draft zone is different from the draft multiple of the rear draft zone, thereby realizing that the first roving 22 and the second roving 23 are subjected to different drafting processes in the drafting system; the third situation is that the product of the gear ratio of the first connecting gear set 19 and the gear ratio of the second connecting gear set 20 is larger than the total draft multiple between the back draft roller pair and the front draft roller pair, that is, the product of the draft multiple of the back left draft zone and the draft multiple of the front right draft zone is larger than the total draft multiple, at this time, the draft multiple of the back left draft zone received by the first roving 22 in the back draft zone is larger than the draft multiple of the back right draft zone received by the second roving 23 in the back draft zone, the draft multiple of the front left draft zone received by the first roving 22 in the front draft zone is smaller than the draft multiple of the front right draft zone received by the second roving 23 in the front draft zone, that is, the total draft multiples received by the first roving 22 and the second roving 23 are the same, but the draft multiple of the front draft zone received by the front draft zone is different from the draft multiple of the back draft zone, thereby, the first roving 22 and the second roving 23 are subjected to different drafting processes in the drafting system.

Claims

1. The single-spindle double-drafting spinning device is characterized by comprising a drafting system, wherein the drafting system comprises a rear drafting roller pair, a middle drafting roller pair and a front drafting roller pair, the rear drafting roller pair comprises a rear lower roller (1) and a rear upper rubber covered roller (2), the middle drafting roller pair comprises a middle lower roller (3) and a middle upper rubber covered roller (4), the front drafting roller pair comprises a front lower roller (5) and a front upper rubber covered roller (6), the rear lower roller (1), the middle lower roller (3) and the front lower roller (5) respectively comprise a roller shaft (7), the roller shafts (7) of the rear lower rollers (1) of all spindle positions of a front vehicle table of a spinning machine are fixedly connected in an integrated manner, the roller shafts (7) of the middle lower rollers (3) of all spindle positions are fixedly connected in an integrated manner, the roller shafts (7) of the front lower rollers (5) of all spindle positions are fixedly connected in an integrated manner, and the roller shafts (7) of the rear lower rollers (1) of all spindle positions of the rear vehicle table of the spinning machine are fixedly connected in an integrated manner, The roller shafts (7) of the middle and lower rollers (3) of all the spindle positions are integrally and fixedly connected, the roller shafts (7) of the front and lower rollers (5) of all the spindle positions are integrally and fixedly connected, and the outer circumference of each roller shaft (7) is provided with a roller sleeve (8); the roller cover (8) of the middle and lower roller (3) is divided into a left roller cover (13) and a right roller cover (14), the left roller cover (13) is fixedly connected with the roller shaft (7) in an integrated mode, the right roller cover (14) is connected with the roller shaft (7) in a sliding mode through a first middle bearing (15), the left end of the right roller cover (14) is fixedly connected with a driving sleeve (24), the driving sleeve (24) is sleeved on the roller shaft (7) between the left roller cover (13) and the right roller cover (14) of the middle and lower roller (3), the right end of the driving sleeve (24) is fixedly connected with the left end of the right roller cover (14), a space is reserved between the left end of the driving sleeve (24) and the right end of the left roller cover (13), and the driving sleeve (24) is in transmission connection with the transmission shaft (17) through a belt (16); the transmission shafts (17) of all spindle positions of the front trolley table surface of a spinning frame are integrally connected, the transmission shafts (17) of all spindle positions of the rear trolley table surface of the spinning frame are integrally connected, the left end and the right end of each transmission shaft (17) are respectively connected and fixed on a frame of the spinning frame through bearings, the right end of a roller shaft (7) of a front lower roller (5) is driven to rotate through a first motor (18), the right end of each transmission shaft (17) is in transmission connection with the right end of the roller shaft (7) of the front lower roller (5) through a first connecting gear set (19), the right end of the roller shaft (7) of a rear lower roller (1) is driven to rotate through a second motor (21), and the right end of the roller shaft (7) of a middle lower roller (3) is in transmission connection with the right end of the roller shaft (7) of the rear front lower roller through a second connecting gear set (20); the rear upper gluing roller (2), the middle upper gluing roller (4) and the front upper gluing roller (6) comprise gluing roller shafts (10); a spindle group is formed by a rear cart table board of a spinning frame, a spindle position of a front cart table board and a spindle position adjacent to the right side, the rubber roll shafts (10) of the rear upper rubber roll (2) on the two spindle positions of the spindle group are integrally connected, the rubber roll shafts (10) of the upper middle rubber roll (4) are integrally connected, the rubber roll shaft (10) of the front upper rubber roll (6) is integrally connected, the rubber roll sleeve (9) is tightly sleeved on the outer circumference of the rubber roll shaft (10) of the rear upper rubber roll (2), the upper middle rubber roll (4) and the front upper rubber roll (6) of each spindle position, the rubber roll sleeve (9) of the rear upper rubber roll (2) is consistent with the roller sleeve (8) of the rear lower roller (1) in length and the left and right ends are aligned, the rubber roll sleeve (9) of the rear upper rubber roll (2) is connected with the rubber roll shaft (10) of the rear upper rubber roll (2) through a second intermediate bearing, the rubber roll sleeve (9) of the front upper rubber roll (6) is consistent with the roller sleeve (8) of, a rubber roll sleeve (9) of the front upper rubber roll (6) is connected with a rubber roll shaft (10) of the front upper rubber roll (6) through a third middle bearing, the rubber roll sleeve (9) of the middle upper rubber roll (4) is divided into a left rubber roll sleeve (11) and a right rubber roll sleeve (12), the left rubber roll sleeve (11) of the middle upper rubber roll (4) is consistent with the left roller sleeve (13) of the middle lower roller (3) in length, the left end and the right end of the middle upper rubber roll (4) are aligned, the right rubber roll sleeve (12) of the middle upper rubber roll (4) is consistent with the right roller sleeve (14) of the middle lower roller (3) in length, the left end and the right end of the middle upper rubber roll (4) are aligned, the left rubber roll sleeve (11) of the middle upper rubber roll (4) is connected with the rubber roll shaft (10) of the middle upper rubber roll (4) through a fourth middle bearing, and the right rubber roll sleeve (12) of the middle upper; a rubber roll shaft (10) between rubber roll sleeves (9) of a rear sizing roll (2), an upper middle sizing roll (4) and a front sizing roll (6) of two spindle positions of one spindle position group is sequentially embedded into a rear embedding claw, a middle embedding claw and a front embedding claw of a pressurizing assembly from back to front, so that the rear sizing roll (2), the upper middle sizing roll (4) and the front sizing roll (6) are installed on the pressurizing assembly, the rear part of the pressurizing assembly is fixed on a platform surface of a spinning machine through a fixed shaft, the pressurizing assembly rotates along the fixed shaft, and the rear sizing roll (2), the upper middle sizing roll (4) and the front sizing roll (6) are pressed downwards under certain pressure in the rotating process; the spinning method of the single-spindle double-drafting spinning device comprises the following steps: when the device is used, the pressurizing assembly rotates along the fixed shaft under the action of force, so that the pressurizing assembly is pressed downwards, the rubber roll sleeve (9) of the rear upper rubber roll (2) of each spindle position is in tight press contact with the roller sleeve (8) of the rear lower roller (1), the left rubber roll sleeve (11) and the right rubber roll sleeve (12) of the upper rubber roll (4) are in tight press contact with the left roller sleeve (13) and the right roller sleeve (14) of the middle lower roller (3) respectively, the rubber roll sleeve (9) of the front upper rubber roll (6) is in tight press contact with the roller sleeve (8) of the front lower roller (5), the first motor (18) drives the roller shaft (7) of the front lower roller (5) to rotate, the roller sleeve (8) of the front lower roller (5) and the roller sleeve (5) are integrally and fixedly connected with the roller shaft (7) of the front lower roller (5) to synchronously rotate, and the roller sleeve (8) of the front lower roller (5) rotates to drive the roller sleeve (8) to be in tight press contact with the roller sleeve (8) of the front lower roller (5) in tight press contact The rubber covered roller (9) of the front upper rubber covered roller (6) synchronously rotates, the roller shaft (7) of the front lower roller (5) rotates and then drives the transmission shaft (17) to rotate through the first connecting gear set (19), the transmission shaft (17) rotates and then drives the right roller cover (14) of the middle lower roller (3) to rotate through the belt (16), the right roller cover (14) of the middle lower roller (3) rotates and then drives the right rubber covered roller cover of the middle upper rubber covered roller (4) which is tightly pressed and contacted with the right roller cover (14) of the middle lower roller (3) to synchronously rotate, at the moment, a right front drafting zone is formed between the front roller drafting pair and a middle right drafting roller pair consisting of the right roller cover (14) of the middle lower roller (3) and the right rubber covered roller cover (12) of the middle upper rubber covered roller (4), and the drafting multiple of the right front drafting zone is fixed and equal to the gear ratio of the first connecting gear set (19); the second motor (21) drives the roller shaft (7) of the rear lower roller (1) to rotate, then drives the roller sleeve (8) of the rear lower roller (1) which is fixedly connected with the roller shaft (7) of the rear lower roller (1) in an integrated manner to synchronously rotate, the roller sleeve (8) of the rear lower roller (1) rotates to drive the rubber roller sleeve (9) of the rear upper rubber roller (2) which is tightly pressed and contacted with the roller sleeve (8) of the rear lower roller (1) to synchronously rotate, the roller shaft (7) of the rear lower roller (1) rotates to drive the roller shaft (7) of the middle lower roller (3) to rotate through the second connecting gear set (20), the roller shaft (7) of the middle lower roller (3) rotates to drive the left roller sleeve (13) of the middle lower roller (3) which is fixedly connected with the roller shaft (7) of the middle lower roller (3) in an integrated manner to rotate, and the left roller sleeve (13) of the middle lower roller (3) rotates to drive the roller sleeve (13) which is tightly contacted with the roller sleeve (13) of the middle lower roller (3) in an integrated manner The left rubber roller sleeve (11) of the rubber roller (4) rotates synchronously, a left rear drafting zone is formed between the rear drafting roller pair and a middle left drafting roller pair consisting of a left roller sleeve (13) of the middle lower roller (3) and a left rubber roller sleeve (11) of the middle upper rubber roller (4), the drafting multiple of the left rear drafting zone is fixed and equal to the gear ratio of the second connecting gear set (20), a right rear drafting zone is formed between the rear drafting roller pair and a middle right drafting roller pair consisting of a right roller sleeve (14) of the middle lower roller (3) and a right rubber roller sleeve (12) of the middle upper rubber roller (4), the drafting multiple of the right rear drafting zone is equal to the total drafting multiple between the rear drafting roller pair and the front drafting roller pair divided by the drafting multiple of the right front drafting zone, a left drafting zone is formed between the front drafting roller pair and a middle left drafting roller sleeve (13) of the middle lower roller (3) and a left rubber roller sleeve (11) of the middle upper rubber roller (4), the draft multiple of the left front draft zone is equal to the total draft multiple between the back draft roller pair and the front draft roller pair divided by the draft multiple of the left back draft zone; a feeding horn mouth device is additionally arranged at the rear part of the rear drafting roller pair, the feeding horn mouth device comprises a left horn mouth and a right horn mouth, the left horn mouth and the right horn mouth are fixedly connected through a connecting cross rod, a distance is reserved between the left horn mouth and the right horn mouth, first roving (22) is fed into the drafting system through the left horn mouth, second roving (23) is fed into the drafting system through the right horn mouth, the fed first roving (22) is then fed out through pressing between a roller sleeve (8) of the rear lower roller (1) and a rubber roller sleeve (9) of the rear upper rubber roller (2), then is pressed and output between a left roller sleeve (13) of the middle lower roller (3) and a left rubber roller sleeve (11) of the middle upper rubber roller (4), in the process, the first roving (22) is subjected to the drafting effect of a left rear drafting area to obtain a first fiber bundle, and then the first fiber bundle is pressed and output through pressing between the roller sleeve (8) of the front lower roller (5) and the rubber roller sleeve (9) of the front upper rubber roller (, in the process, the first fiber bundle is subjected to the drafting action of the left front drafting zone to obtain a first fiber strip, the fed second roving yarn (23) is then pressed and fed between the roller sleeve (8) of the rear lower roller (1) and the rubber roller sleeve (9) of the rear upper rubber roller (2), then the second roving is pressed and output between a right roller sleeve (14) of the middle lower roller (3) and a right rubber roller sleeve (12) of the middle upper rubber roller (4), a second fiber bundle is obtained by the drafting action of a right rear drafting zone in the process, the second fiber bundle is pressed and output between a roller sleeve (8) of the front lower roller (5) and a rubber roller sleeve (9) of the front upper rubber roller (6), a second fiber strip is obtained by the drafting action of a right front drafting zone in the process, thereby realizing that the total draft multiple of the fed first roving (22) and the fed second roving (23) in the draft system is the same; the first fiber strip and the second fiber strip are continuously output under the drive of the rotation of the front drafting roller pair, the first fiber strip and the second fiber strip output by the drafting system interact to form yarn under the action of twisting twist, and according to the properties of the output first fiber strip and the second fiber strip, when the twisting direction of the twisting twist is Z twisting, the interaction yarn forming process comprises four kinds, wherein the first fiber strip positioned on the left side wraps the second fiber strip positioned on the right side to form yarn, and the first fiber strip and the second fiber strip respectively perform twisting action in the wrapping process; the second one is that the first fiber strip on the left side is firstly twisted and then is wrapped into yarn by the second fiber strip on the right side, and the two fiber strips respectively perform twisting action simultaneously in the wrapping process; the third is that the first fiber strip on the left side and the second fiber strip on the right side are directly merged and intertwined with each other to form yarn, the second fiber strip on the right side is gradually wrapped by the first fiber strip on the left side in the intertwining process, and the two fiber strips are twisted simultaneously in the intertwining process; the fourth step is that the first fiber strip on the left side and the second fiber strip on the right side are firstly twisted respectively and then are mutually wound into yarn, and the second fiber strip which is twisted primarily on the right side is gradually wrapped by the first fiber strip which is twisted primarily on the left side in the winding process; when the twisting direction of twisting twist is S twist, the action process of interaction yarn formation at the moment comprises four kinds, the first kind is that the second fiber strip positioned at the right side wraps the second fiber strip positioned at the left side to form yarn, and the two carry out twisting action respectively in the wrapping process; the second is that the second fiber strip on the right side is firstly twisted and then is wrapped into yarn by the first fiber strip on the left side, and the two fiber strips respectively perform twisting action simultaneously in the wrapping process; the third is that the first fiber strip on the left side and the second fiber strip on the right side are directly merged and intertwined with each other to form yarn, the first fiber strip on the left side is gradually wrapped by the second fiber strip on the right side in the intertwining process, and the first fiber strip and the second fiber strip are twisted simultaneously in the intertwining process; the fourth method is that the first fiber strip on the left side and the second fiber strip on the right side are twisted respectively firstly and then are twisted mutually to form yarn, and the first fiber strip which is twisted preliminarily on the left side is gradually wrapped by the second fiber strip which is twisted preliminarily on the right side in the winding process; wherein the draft multiple of the front draft zone and the draft multiple of the rear draft zone are the same or different, the draft distribution in the front and rear draft zones is different, including three conditions, the first condition is that the product of the gear ratio of the first connecting gear set (19) and the gear ratio of the second connecting gear set (20) is equal to the total draft multiple between the rear draft roller pair and the front draft roller pair, namely the product of the draft multiple of the left rear draft zone and the draft multiple of the right front draft zone is equal to the total draft multiple, at the moment, the draft multiple of the left rear draft zone received by the first roving (22) in the rear draft zone is equal to the draft multiple of the right rear draft zone received by the second roving (23) in the rear draft zone, the draft multiple of the left front draft zone received by the first roving (22) in the front draft zone is equal to the draft multiple of the right front draft zone received by the second roving (23) in the front draft zone, namely, the total draft multiple of the first roving (22) and the second roving (23) is the same, and the draft multiple of the front draft zone and the draft multiple of the rear draft zone are also the same, so that the first roving (22) and the second roving (23) are subjected to the same draft process in the draft system; the second condition is that the product of the gear ratio of the first connecting gear set (19) and the gear ratio of the second connecting gear set (20) is smaller than the total draft multiple between the rear draft roller pair and the front draft roller pair, namely the product of the draft multiple of the rear left draft area and the draft multiple of the front right draft area is smaller than the total draft multiple, at the moment, the draft multiple of the rear left draft area received by the first roving (22) in the rear draft area is smaller than the draft multiple of the rear right draft area received by the second roving (23) in the rear draft area, the draft multiple of the front left draft area received by the first roving (22) in the front draft area is larger than the draft multiple of the front right draft area received by the second roving (23) in the front draft area, namely the draft multiple of the first roving (22) and the total draft multiple received by the second roving (23) are the same, but the draft multiple of the front draft area received is different from the draft multiple of the rear draft area, thereby realizing that the first roving (22) and the second roving (23) are subjected to different drafting processes in the drafting system; the third condition is that the product of the gear ratio of the first connecting gear set (19) and the gear ratio of the second connecting gear set (20) is larger than the total draft multiple between the back draft roller pair and the front draft roller pair, namely the product of the draft multiple of the back draft zone at the left and the draft multiple of the front draft zone at the right is larger than the total draft multiple, at the moment, the draft multiple of the back draft zone received by the first roving (22) in the back draft zone is larger than the draft multiple of the back draft zone received by the second roving (23) in the back draft zone, the draft multiple of the front draft zone received by the first roving (22) in the front draft zone is smaller than the draft multiple of the front zone received by the second roving (23) in the front draft zone, namely the total draft multiple received by the first roving (22) and the second roving (23) are the same, but the draft multiple of the front draft zone received is different from the draft multiple of the back draft zone, thereby, the first roving (22) and the second roving (23) are subjected to different drafting processes in the drafting system.

2. Single-spindle double-draft spinning device according to claim 1, characterized in that the roller shaft (7) is of solid cylindrical construction.

3. Single-spindle double-draft spinning device according to claim 1, wherein the roller shaft (7) and the roller sleeve (8) are made of the same material and are made of iron or steel.

4. Single-spindle double-draft spinning device according to claim 1, wherein the left roller cover (13) and the right roller cover (14) have the same length with a gap therebetween.

5. A single-spindle double-draft spinning device according to claim 1, wherein the material of the driving sleeve (24) is the same as that of the right roller cover (14), and the driving sleeve (24) has a cylindrical hollow structure with both ends open.

6. Single-spindle double-draft spinning device according to claim 1, characterized in that the drive shaft (17) is of solid cylindrical construction.

7. Single-spindle double-draft spinning device according to claim 1, characterized in that the glue roller shaft (10) is of ferrous material and of solid cylindrical construction.

8. Single-spindle double-draft spinning device according to claim 1, characterized in that the rubber roller sleeve (9) is made of rubber.