CN113882050A

CN113882050A - Production method of pure cotton high-quality combed yarn

Info

Publication number: CN113882050A
Application number: CN202111265432.1A
Authority: CN
Inventors: 沈春明; 徐建洪; 朱华
Original assignee: ZHEJIANG LONGYUAN TEXTILE CO Ltd
Current assignee: ZHEJIANG LONGYUAN TEXTILE CO Ltd
Priority date: 2021-10-28
Filing date: 2021-10-28
Publication date: 2022-01-04
Anticipated expiration: 2041-10-28
Also published as: CN113882050B

Abstract

The invention discloses a method for producing high-quality pure cotton combed yarn, which comprises the steps of mixing, carding and twisting cotton picked by a selected Xinjiang machine, Brazil cotton and Shandong cotton into yarn in sequence, mixing three cotton fibers by impacting after fully opening the fibers by a free carding mixer, then cutting different sections of the input fiber flow in the thickness direction by impacting in a cotton mixer, aligning and outputting the fibers to form fiber layers after passing through bent pipes with different lengths, grabbing the fiber layers in thickness simultaneously by a grabbing device, thereby realizing the mixing of the cotton fibers again, gathering and holding the fibers in an upper cotton box of a cotton cleaner along the thickness direction for outputting and opening, further realizing the mixing of the cotton fibers, further realizing the uniform mixing effect of the cotton fibers in three different production places after mixing, thereby reducing the cotton blending grade, the production cost is reduced, the uniform mixing of various blended cotton fibers is realized, and the comprehensive performance of the spun yarn is effectively improved.

Description

Production method of pure cotton high-quality combed yarn

Technical Field

The invention belongs to the technical field of spinning, and relates to a novel yarn spinning method, in particular to a production method of pure cotton high-quality combed yarn.

Background

For combed pure cotton yarns, due to the requirement of subsequent weaving, the pure cotton combed yarns have high quality requirement, the resultant yarn strength needs to be improved in spinning, and meanwhile, the resultant yarns are required to have less impurities, uniform yarn levelness and less hairiness. Therefore, the selected raw cotton has the advantages of less neps, less foreign fibers, high strength, uniform length and less short fiber content. The raw cotton neps are fewer, and the finished yarn neps are fewer relatively, so that the evenness is uniform. The high strength makes the resultant yarn high in strength. The length is uniform, the short fiber content is low, the floating fiber content is low, the fiber is well controlled by the roller through drafting, and the evenness is uniform.

Disclosure of Invention

The technical problem to be solved is as follows: in order to overcome the defects of the prior art, the invention fully opens three cotton fibers by a free carding mixer and then carries out impact mixing, then the different sections of the input fiber flow in the thickness direction are intercepted in the cotton mixer through impact, and then aligned and output into a fiber layer after passing through bent pipes with different lengths, the fiber layer is grabbed simultaneously in thickness by a grabbing device, thereby realizing the re-mixing of all cotton fibers, and the fibers entering the upper cotton box of the scutcher are grabbed along the thickness direction, gathered together again, held, output and opened, therefore, the mixing of cotton fibers is further realized, and then the uniform mixing effect of the cotton fibers of three different production places for mixing is realized, on one hand, the cotton blending grade is reduced on the premise of keeping the urban comprehensive performance, the production cost is reduced, on the other hand, the uniform mixing of various mixed cotton fibers is realized, and the comprehensive performance of the spun yarn is effectively improved; in view of this, the invention provides a method for producing high-quality pure cotton combed yarn.

The technical scheme is as follows: a production method of pure cotton high-quality combed yarn comprises the steps of sequentially carrying out fiber blending, carding and sliver forming on three cotton fibers, twisting to form the pure cotton high-quality combed yarn, grabbing cotton fibers picked by a Xinjiang machine, Brazil cotton and Shandong cotton through respective cotton grabbing machines in the fiber blending process, carrying out impurity separation on the grabbed cotton fibers through a multifunctional separator, conveying the cotton fibers to three fiber input ports of a free carding mixer through a conveying pipeline, carrying out axial rotation and forward conveying motion on the three cotton fibers along the surface of a free carding roller which keeps rotating in the free carding mixer under the driving of negative pressure air flow, arranging a first arc-shaped rail, a second arc-shaped rail and a third arc-shaped rail on the surface of the free carding roller in an axial direction and a radial direction and surrounding 3-6 circles on the surface of the free carding roller, wherein the first arc-shaped rail, the second arc-shaped rail and the third arc-shaped rail are generated by the driving of the negative pressure air flow and are communicated with the three fiber input ports, the three arc tracks are a large curved arc with radian less than 2 circumferences and without mutual intersection between a starting point and an end point, then a small curved arc with any two arc tracks intersected twice at least, and finally three arc tracks are intersected at one point, three cotton fibers move along the surface of the free carding roller through the large curved arc of each arc track respectively in a free state, so that the free beating of carding card clothing on the surface of the free carding roller is received in the moving process to realize full free opening, then the three cotton fibers move along the surface of the free carding roller through the small curved arcs of each arc track, on one hand, the free opening is realized, on the other hand, the impact and the opening are realized through the collision among the fibers at the intersection, and finally the three cotton fibers are converged at the convergence point of the arc tracks and sent to the cotton mixer through the conveying pipeline, the cotton fiber mixing machine comprises a cotton mixing machine, wherein the cotton mixing machine is internally provided with impact openings at the upper parts of cotton bins, so that the blocked fiber flow is impacted and loosened to fall into the corresponding cotton bins, then the acquisition of fibers at different sections along the thickness direction of the fiber flow is realized by the cotton bins, simultaneously massive impurities enter the impact openings due to large inertia effect in the impacting process to realize impurity removal effect, the fibers in the cotton bins are respectively stripped by stripping roller pairs and enter 90-degree bent pipes with different lengths, and are output into fiber layers at aligned outlets of the bent pipes, the fiber layers are grabbed by a fiber grabbing curtain along the thickness direction and then are sent into a cotton cleaner by a conveying pipeline, so that further uniform mixing is realized, the cotton fibers firstly fall into an upper cotton box of the cotton cleaner, and the fiber layers are driven by the conveying curtains which are arranged in parallel left and right and are respectively rotated in a left and right cycle mode and arranged at the bottom of the upper cotton box to enable the fiber layers to be in a certain pressure with the left side, the left side and the right side in the upper cotton box, The conveying curtains which are vertically arranged on the right side and circularly rotate from bottom to top are contacted, so that the fibers are grabbed along the thickness direction of the fiber layer, the grabbed fibers enter the large-diameter gathering roller pairs which are arranged in parallel from the left side to the right side through the connecting pipe openings to be gathered, then the fibers are held and output through the small-diameter holding roller pairs, the fibers are beaten and loosened by the opening card clothing on the holding carding roller below the holding carding roller in the holding output process and are completely transferred, the transferred fibers are subjected to impurity removal through the impurity removal device below the holding carding roller and then are conveyed into the foreign fiber removing machine through the conveying pipeline to be subjected to non-cotton fiber identification and removal, and then, the cotton fiber flow is obtained after the micro dust is separated and removed through powerful dust removal; in the carding and slivering process, cotton fibers flow through a carding machine to be held, loosened, finely carded, condensed into a net and gathered into slivers to obtain cotton slivers; in the twisting and yarn forming process, the cotton raw sliver is combed to obtain the cotton combed sliver, the cotton combed sliver is finished by the drawing frame to obtain the cotton drawn sliver with improved linear density uniformity, and the cotton drawn sliver is sequentially subjected to roving and spinning to obtain the pure cotton high-quality combed yarn. The method comprises the following specific steps:

in the fiber blending process, three cotton fibers of Xinjiang, Shandong and Brazilian are selected to be blended, wherein the machine-harvested cotton in the Xinjiang production area has low impurity content and short fiber rate, but the cotton knots are too much, so the Brazilian cotton with less short fibers is blended to control the cotton knot content, the Shandong cotton is used for controlling the production cost, the short fibers are too much, the length is short, and the fibers are thick, in order to ensure the quality of raw cotton, the proportion of the Shandong cotton is controlled within 10 percent during the selection and the blending, the proportion of the Brazilian cotton is controlled between 20 percent and 30 percent, and the proportion of the Xinjiang cotton is controlled between 60 percent and 80 percent; the method comprises the steps that three cotton fibers which are selected and matched are respectively grabbed by a cotton grabbing machine, the cotton fibers are placed in a hollow disc in the grabbing process, a cotton grabbing beater above the disc is in contact with the cotton fibers in the disc under certain pressure, a sawtooth beater on the cotton grabbing beater rotates along the circumferential direction of a cotton grabbing roller, the cotton fibers in contact with the cotton grabbing beater are beaten and loosened, partial cotton fibers are transferred to the cotton grabbing beater under the beating action, the cotton fibers are loosened and grabbed, the cotton grabbing beater rotates along the circumferential direction of the disc at the same time, the continuous grabbing of the cotton fibers in the disc is achieved, the three cotton fibers after grabbing are respectively conveyed to a multi-function separator through a conveying pipeline to separate and remove heavy objects and impurities, in the process, iron materials in the cotton fibers are separated and removed through a bridge type magnet device, and massive impurities in the fibers are separated and removed from the cotton fibers due to the action of large centrifugal force in the high-speed turning process through a bent pipe structure with the turning degree larger than 180 degrees Clearing; then, the three cotton fibers are jointly sent into a free carding mixer; the free carding mixer comprises a closed hollow cylinder, a free carding roller is arranged in the hollow cylinder, two ends of the free carding roller are fixedly connected to the side surface of the hollow cylinder through bearings, free carding card clothing is arranged on the surface circumference of the free carding roller and is wrapped on the free carding roller in a pasting mode, the free carding roller is driven to rotate by a transmission mechanism, a first fiber input port, a second fiber input port and a third fiber input port which are arranged in parallel are arranged on one side, close to the rear, of the upper side surface of the hollow cylinder, a fiber output port is arranged on one side, close to the front, of the upper side surface of the hollow cylinder, a first arc-shaped rail, a second arc-shaped rail and a third arc-shaped rail are arranged between the first fiber input port and the fiber output port, the three arc-shaped rails are intersected at the fiber output port, and the arc length of a large-bending arc-shaped roller is larger than the circumference of one cross section circumference of the free carding roller and smaller than the circumference of one cross section of the free carding roller The length of the free carding roller is 2 times longer, the arc length of the small bending arc is smaller than the circumference of one cross section circumference of the free carding roller, a fiber supporting device is arranged at the bottom of the free carding roller, fibers can circularly move around the surface of the free carding roller under the supporting action of the fiber supporting device, impurities in the fibers fall and are separated from the fibers due to the gravity of the impurities in the fibers in the supporting process, three cotton fibers are respectively conveyed to a first fiber input port, a second fiber input port and a third fiber input port of the free carding machine through conveying pipelines, cotton fibers entering from the first fiber input port are axially rotated and radially advanced along a first arc track under the action of negative pressure airflow, cotton fibers entering from the second fiber input port are axially rotated and radially advanced along a second arc track, cotton fibers entering from the third fiber input port are axially rotated and radially advanced along a third arc track, in the process, three cotton fibers move along the surface of the free carding roller through the large curved arcs of the respective arc tracks independently in a free state, so that free striking of the free carding card clothing on the surface of the free carding roller is received in the moving process to realize sufficient free opening effect, the rotating speed of the free carding roller is higher than the rotating speed of the cotton fibers along the axial direction of the surface of the free carding roller, the free carding card clothing and the fibers rotate relatively in the axial direction, then the free carding card clothing strikes the fibers, so that opening of the fibers is realized under the striking effect, then the three cotton fibers move along the surface of the free carding roller through the small curved arcs of the respective arc tracks respectively in a free state, and the rotating speed of the free carding roller in the process is lower than the rotating speed of the cotton fibers along the axial direction of the surface of the free carding roller, the free carding card clothing and the fibers axially rotate relatively to realize striking and opening of the fibers, the two fibers are collided at the intersection of the two arc-shaped rails under high-speed motion, opening and mixing under collision are realized in the collision process, the mixed fibers are randomly distributed and then continuously move along the corresponding arc-shaped rails respectively, the cotton fibers of the three arc-shaped rails are converged at a fiber output port, mutual impact action of the three is generated in the convergence process, so that the fibers are further struck and opened, mutual permeation is realized among the fibers in the mutual impact process, so that permeation and mixing action of the three cotton fibers is realized, and the converged cotton fiber flow is sent into a cotton mixing machine through a conveying pipeline; the cotton mixing machine comprises 6-8 cotton bins, the cotton bins are cuboids with hollow structures and open upper side surfaces and lower side surfaces, fiber conveying pipes are arranged above the cotton bins, photoelectric control fiber output ports are arranged at the bottoms of the fiber conveying pipes right above the cotton bins, high-degree photoelectric control barrier plates are arranged on the fiber conveying pipes in front of the fiber output ports, filter screens are arranged at the centers of the barrier plates, impurity collecting nets are arranged behind one sides of the filter screens, stripping roller pairs are arranged on the lower side surfaces of the cotton bins and driven by a transmission mechanism to rotate, fiber conveying bent pipes are arranged at the bottoms of the cotton bins, the fiber conveying bent pipes are 90-degree bent pipes, one sides of the fiber conveying bent pipes are vertically aligned with the stripping roller pairs on the lower side surfaces of the cotton bins, the other sides of the fiber conveying bent pipes are horizontally aligned, fiber catching curtains which are inclined upwards and keep circulating and reciprocating rotation are arranged at the aligned sides of the fiber conveying bent pipes, the fiber grabbing curtain is provided with fiber grabbing angle nails, the fiber layer output from the outlet at one side, which is aligned with the fiber conveying bent pipe, of the fiber grabbing curtain keeps an inclined included angle, the fiber grabbing angle nails on the fiber grabbing curtain are driven by a transmission mechanism to circularly and reciprocally rotate from bottom to top, the fiber equalizing roller is arranged above the top end of the fiber grabbing curtain, when in use, cotton fiber flow output by the free carding mixer is conveyed into the cotton mixing machine through a fiber conveying pipe, the blocking plates in the fiber conveying pipes above the cotton bins are controlled by a photoelectric control device to ascend, the ascending height of the blocking plates is increased along with the increase of the distance between the cotton bins and the input direction of the cotton fiber flow, meanwhile, the fiber output ports of the fiber conveying pipes above the cotton bins are controlled by the photoelectric control device to be in an open state, so that the high-speed moving cotton fiber flow in the fiber conveying pipes is blocked by the blocking plates, and part of the cotton fibers in the thickness direction of the cotton fiber flow are impacted in the blocking process, in the impacting process, impurities pass through a filter screen of a baffle plate and then enter an impurity collecting net due to the large inertia of the impurities, so that the impurity removing effect is realized, meanwhile, the impacting effect directly enables fibers in a cotton fiber flow to be further dispersed, so that the impacting and opening effect is realized, the impacted cotton fibers fall into cotton bins along fiber output ports under the action of self gravity, then, the cotton bins obtain cotton fibers at different sections along the thickness direction of the cotton fiber flow, when the fiber height in the cotton bins reaches a controlled height, stripping roller pairs at the bottom of the cotton bins are driven by a transmission mechanism to start working, at the moment, stripping rollers arranged in the left side and the right side in parallel of the stripping roller pairs rotate clockwise, stripping rollers on the right side synchronously rotate anticlockwise, so that the cotton fibers in the cotton bins are stripped, and the stripped cotton fibers fall into fiber conveying bent pipes, the cotton fibers output from the outlets of the fiber conveying bent pipes are overlapped into a cotton fiber layer, because the lengths of the fiber conveying bent pipes are different, the cotton fibers in the fiber layers at the junction are fibers with different conveying lengths, the cotton fibers intercepted at different sections are mixed under the conveying of different lengths, the cotton fiber layer formed by the junction is simultaneously grabbed along the thickness direction of the fiber layer by fiber grabbing corner nails on a fiber grabbing curtain, so that the fiber layers transversely paved are effectively mixed under the longitudinal simultaneous grabbing, the cotton fibers grabbed by the fiber grabbing corner nails are driven by the fiber grabbing curtain to be conveyed upwards, part of the cotton fibers with thick fiber layers in the conveying process are hit by rotating fiber equalizing rollers, the uniform finishing effect of the fiber layers is realized, and the uniformly finished fiber flow is conveyed into a cotton cleaner by corresponding conveying pipelines, the cotton cleaner comprises an upper cotton box, the upper cotton box is in a hollow cuboid shape, the top end of the upper cotton box is connected with a conveying pipeline communicated with the cotton mixer, a left horizontal conveying curtain and a right horizontal conveying curtain which are horizontally aligned from left to right are arranged at the bottom of the upper cotton box, the left horizontal conveying curtain circularly and reciprocally rotates from right to left, the right horizontal conveying curtain circularly and reciprocally rotates from left to right, a left cotton grabbing corner nail and a right cotton grabbing corner nail are respectively arranged on the left horizontal conveying curtain and the right horizontal conveying curtain, a left vertical conveying curtain in a vertical state is arranged at the left side surface of the upper cotton box, a right vertical conveying curtain in a vertical state is arranged at the right side surface of the upper cotton box, the left vertical conveying curtain and the right vertical conveying curtain are driven by a transmission mechanism to circularly and reciprocally rotate from bottom to top, a left connecting pipe is arranged at the left side of the left vertical conveying curtain, a right connecting pipe is arranged at the right side of the right vertical conveying curtain, a gathering roller pair is arranged at the bottoms of the left horizontal conveying curtain and the right horizontal conveying curtain, the gathering roller pair comprises a left gathering roller and a right gathering roller which are large in diameter and keep a left-right alignment, the upper portion of the left gathering roller and the lower output port of the left connecting pipe are kept in an aligned state, the upper portion of the right gathering roller and the lower output port of the right connecting pipe are kept in an aligned state, a holding roller pair is arranged on the lower portion of the gathering roller pair and comprises a left holding roller and a right holding roller which are small in diameter and keep a left-right alignment, a holding carding roller is arranged on the lower portion of the holding roller pair and driven to rotate by a transmission mechanism, holding opening card clothing is wrapped on the surface of the holding carding roller, a fiber holding impurity removing device is arranged on the lower portion of the holding carding roller, uniformly arranged fiber flow is sent into an upper cotton box through a conveying pipeline, and when the height of cotton fiber entering the upper cotton box reaches a set height, a left horizontal conveying device at the bottom of the upper cotton box, The left and right circular rotation of the right horizontal conveying curtain drives the cotton fiber layer falling into the upper cotton box to contact with the left vertical conveying curtain and the right vertical conveying curtain of the upper cotton box respectively with certain pressure, at the moment, the cotton fibers in the thickness direction of the cotton fiber layer in the upper cotton box are simultaneously grabbed under the driving of the upper circular rotation and the lower circular rotation of the left vertical conveying curtain and the right vertical conveying curtain, so that the effective mixing effect in the grabbing process is realized, the cotton fibers driven by the left vertical conveying curtain and the right vertical conveying curtain are driven to the outward side of the left vertical conveying curtain and the outward side of the right vertical conveying curtain, the cotton fibers driven to the outward side by the left vertical conveying curtain directly enter the left connecting pipe, fall onto the left gathering roller through the left connecting pipe, are driven by the rotating left gathering roller to enter between the gathering roller, the cotton fibers driven to the outward side by the right vertical conveying curtain directly enter the right connecting pipe, the cotton fiber collecting device falls onto a right collecting roller through a right connecting pipe and is driven by the rotating right collecting roller to enter between the collecting roller pair, so that the cotton fiber is collected through the collecting roller pair, the collected cotton fiber directly enters between the holding roller pair and is held and output through the holding roller pair, in the holding and output process of the cotton fiber, one end of the fiber receives the striking action of holding and opening card clothing of the rotating holding and carding roller under the held state, so that the holding and striking opening of the cotton fiber are realized, the cotton fiber which is held, struck and opened is transferred onto the holding and carding roller and is driven to rotate by the holding and carding roller, the cotton fiber rotates to the other side of the holding and carding roller after surrounding the holding and carding roller for one circle under the supporting action of a fiber supporting and impurity removing device at the bottom of the holding and carding roller, and the held, struck and opened cotton fiber flow is sent into a special fiber removing machine through a conveying pipeline, the non-cotton fibers are identified and removed in the foreign fiber removing machine, and then the cotton fiber flow which can be used for carding processing is obtained after the micro-dust is separated and removed through strong dust removal.

During carding, the prepared cotton fiber flow is directly conveyed into a carding machine through a conveying pipeline, a strip-shaped cotton sliver is prepared through carding of the carding machine, in the carding process, the entering cotton fiber flow is firstly treated through the holding action of a pressing piece and then uniformly input, in the process, the cotton fiber flow is gradually beaten by a sawtooth beater on a holding and opening roller at one end under the state that one end of the cotton fiber flow is held, so that the gradual opening action of the sawtooth beater on the fiber from beating loosening to penetrating into carding is realized, the gradually opened cotton fiber is completely transferred onto the holding and opening roller along with continuous input, the cotton fiber on the holding and opening roller is then completely stripped by a free carding roller horizontally and closely arranged with the holding and opening roller, the cotton fiber is transferred onto the free carding roller from the holding and opening roller, the cotton fiber on the free carding roller is conveyed between the free carding roller and a free carding cover above the free carding roller under the driving of the free carding roller, free carding card clothing is arranged on the free carding roller and the free carding cover, the free carding card clothing on the free carding roller and the free carding card clothing on the free carding cover respectively grab the cotton fibers between the free carding roller and the free carding cover, the cotton fibers are decomposed under the grabbing action of the free carding card clothing and the free carding cover simultaneously, the free carding of the cotton fibers is realized, the cotton fibers are repeatedly transferred between the free carding roller and the free carding cover for a plurality of times, the free carding action for a plurality of times is realized in the repeated transfer process until the cotton fibers are decomposed into a single fiber state, the cotton fibers which are freely carded rotate along with the rotation of the free carding roller, when the cotton fibers rotate to a condensing roller part which is arranged in parallel at the left and the right and is close to the free carding roller, the condensing card clothing on the condensing roller applies grabbing acting force to the cotton fibers, so that part of the cotton fibers on the free carding roller is transferred to the condensing roller, the cotton fiber which is not transferred to the condensing roller continuously rotates along with the rotation of the free carding roller, when the cotton fiber rotates to the bottom of the free carding roller, the cotton fiber is transferred between the free carding roller and the free carding cover again under the supporting action of a fiber supporting and impurity removing device arranged at the bottom of the free carding roller for free carding, the fiber supporting and impurity removing device has the impact action on impurities in the cotton fiber and the fiber supporting and impurity removing device in the supporting and holding process of the fiber, so that the centrifugal force of the impurities is changed in direction, the impurities fall down along the gap between the fiber supporting and impurity removing device under the action of large centrifugal force, so that the impurity removal of the cotton fiber is realized, the cotton fiber transferred to the condensing roller is condensed into a cotton fiber net on the condensing roller with small diameter, and the cotton fiber net is sent into a horn mouth after being peeled by the peeling roller and then is condensed into cotton fiber strips, the required cotton slivers are obtained after the cotton fiber slivers are pressed and finished, and the cotton slivers are wound in a hollow sliver can.

In the twisting and yarn forming process, the prepared cotton raw sliver is combed to obtain a cotton combed sliver, the cotton combed sliver is finished by a drawing frame to obtain a cotton drawn sliver with improved linear density uniformity, and the cotton drawn sliver is subjected to roving and spinning in sequence to obtain the required pure cotton high-quality combed yarn; the method comprises the steps of pre-drawing cotton slivers to obtain cotton pre-drawing strips with improved linear density uniformity, feeding 8 cotton slivers together in the process, combining the fed 8 cotton slivers, drafting by 8 times to obtain the required cotton pre-drawing strips, pre-drawing the cotton slivers, rolling to obtain cotton rolls with a roll structure with certain width, feeding 24 cotton pre-drawing strips together in the process, combining all the fed cotton pre-drawing strips into cotton rolls with certain width after weak drafting by 1.5 times, rolling to obtain cotton combed rolls with improved uniformity, feeding 3-6 cotton rolls together in the process, combining the fed cotton rolls up and down under the action of pressing force to obtain large cotton rolls with high linear density, thus the uniformity of the cotton rolls is further improved in the merging process, and then the large cotton rolls are drafted by 2-4 times to obtain the cotton combed rolls with reduced linear density and improved fiber straightness; the combed cotton rolls are combed to obtain a combed cotton strip with improved fiber straightening degree and reduced short staple fibers, in the combing process, the combed cotton rolls are fed through panel groups arranged up and down, in the process, the lower panel moves back and forth to support the combed cotton rolls, the upper panel moves back and forth, the distance between the upper panel and the lower panel is gradually reduced in the advancing process, the distance between the upper panel and the lower panel is gradually increased in the retreating process, the upper panel and the lower panel are gradually closed in the advancing process to gradually convey and hold the cotton fibers between the upper panel and the lower panel, the other ends of the cotton fibers are held and combed by a rotating cylinder under the holding effect, the hook parts in the fibers are straightened under the combing effect, meanwhile, part of the shorter cotton fibers are combed under the combing effect, the cotton fibers which are held and combed are combined with the poured cotton fibers by an inverted roller, and the transfer output of the held and combed cotton fibers is realized, the upper and lower embedded plates are gradually opened in the backward moving process so as to continuously support and convey the subsequently fed cotton combed rolls, the cotton fibers output by the separating roller are pressed and then become the cotton half-slivers, and the cotton half-slivers output by 8 carding mechanisms of the comber are drafted and then recombined so as to obtain the required cotton combed slivers; the cotton combed strips are arranged by two drawing frames to obtain cotton drawn strips with improved linear density uniformity, 6 cotton combed strips are fed together in the first drawing, the fed 6 cotton combed strips are firstly drafted and then combined to obtain cotton half-drawn strips, 6 cotton half-drawn strips are fed together in the second drawing, the fed 6 cotton half-drawn strips are pressed by a detection pressing roller with a pressure sensing device after being combined, so that the linear density of the fed combined cotton half-drawn strips is detected by the pressure sensing device in the pressing process, the combined cotton half-drawn strips enter a drafting system, the drafting system comprises a rear lower roller, a middle lower roller and a front lower roller, a rear upper rubber roller is arranged on the rear lower roller, a middle rear upper rubber roller and a middle front upper rubber roller are arranged on the middle lower roller, a front upper rubber roller is arranged on the front lower roller, the rear lower roller is driven to rotate by a single first motor, the front lower roller is driven by an independent second motor to rotate, the middle lower roller is in transmission connection with the front lower roller through a gear, a pressure sensing signal obtained by detection of the pressing roller is transmitted to the first motor through the operation unit, when the obtained pressure sensing signal is smaller than a predicted pressure value, the first motor accelerates, so that the drafting multiple of the drafting system is reduced, when the obtained pressure sensing signal is larger than the predicted pressure value, the first motor decelerates, so that the drafting multiple of the drafting system is increased, then intelligent adjustment of the drafting multiple of the drafting system according to the linear density of the fed cotton half-cooked sliver is realized, and the uniformity of the linear density of the output cotton half-cooked sliver is further improved; the rough cotton yarn with required linear density and certain strength is obtained after the rough cotton sliver is subjected to rough cotton yarn, the rough cotton yarn comprises drafting, twisting and winding, the fed rough cotton sliver firstly enters a drafting system, cotton fibers in the rough cotton sliver perform speed change movement from slow to fast under the action of the drafting, so that the linear density is reduced under the action of the speed change, meanwhile, due to the difference of friction acting force borne by one fiber in the speed change process, different speed changes occur at different positions on the fiber, then, the fiber generates speed difference of relative movement in different speed changes, the straightening action of the fiber is further realized, the rough cotton sliver is drafted to obtain cotton slivers with certain linear density, the cotton slivers output by the drafting system then pass through a rotating hollow copper pipe, the twisting action on the cotton slivers is realized under the action of the rotation of the copper pipe, and the cotton fibers in the cotton slivers are transferred under the twisting action, then the cotton fibers are mutually intertwined, so that a certain cohesive acting force is generated among the cotton fibers, then the cotton roving with certain strength is obtained, and the prepared cotton roving is driven by the rotating copper pipe and then is continuously wound on the copper pipe; the cotton roving is firstly fed into a drafting system, the cotton fiber in the cotton roving performs variable speed motion from slow to fast under the combined action of the drafting acting force of a roller and the mutual friction acting force of the fibers in the cotton roving, so that the linear density is reduced under the variable speed action, meanwhile, the different speed changes occur at different positions on the fiber due to the different friction acting forces on one fiber in the variable speed process, so that the fiber generates the speed difference of relative motion at different speed changes, the straightening action of the fiber is realized, the cotton roving is drafted to obtain cotton fiber strips with a certain linear density, the cotton fiber strips output by the drafting system are driven by a rotating bobbin to correspondingly rotate, and in the bobbin driving process, the yarn simultaneously passes through the steel wire ring with certain weight on the steel collar, so that the rotating speed of the yarn is lower than that of the bobbin, the rotating speed difference between the yarn and the steel wire ring has a twisting twist action on the yarn, the twisting twist is transmitted along the yarn from bottom to top, the twisting of cotton fiber strips output by the drafting system is realized, fibers in the cotton fiber strips are mutually transferred under the twisting action, the cotton fibers are mutually wound under the transferring action, and then the cotton fibers generate larger cohesive force, so that the cotton combed yarn with certain strength is obtained, and the cotton combed yarn is synchronously wound on the bobbin under the twisting action.

Has the advantages that: the method of the invention fully opens three cotton fibers by a free carding mixer and then mixes the three cotton fibers by impact, then the different sections of the input fiber flow in the thickness direction are intercepted in the cotton mixer through impact, and then aligned and output into a fiber layer after passing through bent pipes with different lengths, the fiber layer is grabbed simultaneously in thickness by a grabbing device, thereby realizing the secondary mixing of all cotton fibers, gripping and outputting the opening after the fibers entering the upper cotton box of the scutcher are grabbed along the thickness direction and gathered, thereby further realizing the mixing of the cotton fibers and further realizing the uniform mixing effect of the cotton fibers of three different production places, thereby on one hand, the cotton blending grade is reduced, thereby the production cost is reduced, on the other hand, the uniform mixing of various blended cotton fibers is realized, thereby the comprehensive performance of the spun yarn is effectively improved.

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

Taking the production of a 32S pure cotton combed yarn as an example, the method specifically comprises the following steps:

the first step is as follows: mixing fibers, namely selecting 65% of Xinjiang cotton, 25% of Brazil cotton and 10% of Shandong cotton, mixing, grabbing the three cotton fibers sequentially by a bale plucker, sending the three cotton fibers into a free carding mixer for mixing, mixing again by a cotton mixer, holding and opening by a cotton cleaner to obtain a cotton fiber flow; in the process of cotton grabbing, three cotton fibers selected and matched are grabbed by a cotton grabbing machine respectively, the cotton fibers are placed in a hollow disc in the grabbing process, a cotton grabbing beater above the disc is in contact with the cotton fibers in the disc under certain pressure, a sawtooth beater on the cotton grabbing beater rotates along the circumferential direction of a cotton grabbing roller, so that the cotton fibers in contact with the cotton grabbing beater are beaten and loosened, partial cotton fibers are transferred to the cotton grabbing beater under the beating action, the cotton fibers are loosened and grabbed, the cotton grabbing beater rotates along the circumferential direction of the disc simultaneously, continuous and continuous grabbing of the cotton fibers in the disc is achieved, the three cotton fibers after grabbing are conveyed to a multi-function separator through a conveying pipeline respectively to separate and remove heavy objects and impurities, iron materials in the cotton fibers are separated and removed through a bridge type magnet device in the process, and massive impurities in the fibers are separated and removed through a bent pipe structure with the degree of more than 180 degrees in the high-speed turning process due to the fact that the massive impurities in the fibers are conveyed to a multi-function separator through the conveying pipeline The larger centrifugal force is separated and removed from the cotton fiber; then send three kinds of cotton fiber into freely carding machine jointly, freely carding machine includes the confined hollow cylinder, be provided with freely carding roller in the hollow cylinder, freely carding roller both ends pass through bearing fixed connection on the side of hollow cylinder, be provided with freely carding card clothing on freely carding roller's surface circumference, freely carding card clothing wraps up on freely carding roller through pasting the mode, freely carding roller is driven by drive mechanism and rotates, one side behind leaning on of the upper surface of hollow cylinder is provided with parallel arrangement's first fibre input port, the second fibre input port, the third fibre input port, one side leaning on before of the upper surface of hollow cylinder is provided with the fibre delivery outlet, be provided with the first arc track that negative pressure air current drove the production between first fibre input port and fibre delivery outlet, the second arc track, the third arc track, three arc track are arranged along freely carding roller's surface axial and radial thereby encircle 3 in freely carding roller surface- 6 circles, three arc tracks are a large curved arc which has radian smaller than 2 circumference ratio between a starting point and an end point and does not intersect with each other, then a small curved arc in which any two arc tracks intersect at least twice, and finally three arc tracks intersect at a fiber output port, the arc length of the large curved arc is longer than the perimeter of one cross section circumference of the free carding roller and is smaller than 2 times of the perimeter of one cross section circumference of the free carding roller, the arc length of the small curved arc is shorter than the perimeter of one cross section circumference of the free carding roller, a fiber supporting device is arranged at the bottom of the free carding roller, fibers can perform circular motion around the surface of the free carding roller under the supporting action of the fiber supporting device, and impurities are separated from the fibers by gravity due to the larger impurities in the fibers in the supporting process, the three cotton fibers are respectively conveyed to a first fiber input port, a second fiber input port and a third fiber input port of the free carding machine through a conveying pipeline, then under the action of negative pressure air flow, the cotton fibers entering the first fiber input port carry out axial rotation and radial advance along a first arc-shaped track, the cotton fibers entering the second fiber input port carry out axial rotation and radial advance along a second arc-shaped track, and the cotton fibers entering the third fiber input port carry out axial rotation and radial advance along a third arc-shaped track, in the process, the three cotton fibers firstly and independently move along the surface of the free carding roller through the large-bending arc of the arc-shaped track respectively in a free state, so that the free beating of the free carding card clothing on the surface of the free carding roller is received in the moving process to realize sufficient free opening effect, the rotating speed of the free carding roller is higher than the rotating speed of cotton fibers along the axial direction of the surface of the free carding roller, so that the free carding card clothing and the fibers rotate relatively in the axial direction, then the free carding card clothing plays a beating role on the fibers, the fibers are opened under the beating role, then three kinds of cotton fibers move along the surface of the free carding roller through respective small bending arcs of the arc tracks in a free state, and the rotating speed of the free carding roller is lower than the rotating speed of the cotton fibers along the axial direction of the surface of the free carding roller, so that the free carding card clothing and the fibers rotate relatively in the axial direction, the beating and opening of the fibers are realized, meanwhile, collision under high-speed motion occurs between the two kinds of fibers at the intersection of the two arc tracks, and opening and mixing under collision are realized in the collision process, the mixed fibers are distributed randomly and then continuously move along the corresponding arc-shaped tracks, the cotton fibers of the three arc-shaped tracks are converged at a fiber output port, mutual impact action of the three is generated in the converging process, so that the fibers are further impacted and loosened under the impact action, mutual permeation occurs among the fibers in the mutual impact process, the permeation and mixing action of the three cotton fibers is realized, and the converged cotton fiber flow is sent into a cotton mixer through a conveying pipeline; the cotton mixing machine comprises 6-8 cotton bins, the cotton bins are of a hollow structure and are in a cuboid shape with an open upper side surface and an open lower side surface, fiber conveying pipes are arranged above the cotton bins, a photoelectric controllable fiber outlet is arranged at the bottom of the fiber conveying pipe right above each cotton bin, a high-photoelectric controllable barrier plate is arranged on the fiber conveying pipe at the front side of the fiber outlet, a filter screen is arranged in the center of the barrier plate, an impurity collecting net is arranged behind one side of the filter screen, a stripping roller pair is arranged on the lower side surface of each cotton bin, the stripping roller pair is driven by a transmission mechanism to rotate, a fiber conveying elbow is arranged at the bottom of each cotton bin, the fiber conveying elbow is a 90-degree elbow, one side of each fiber conveying elbow is vertically aligned with the stripping roller pair on the lower side surface of each cotton bin, the other side of each fiber conveying elbow is horizontally aligned, and a fiber catching curtain which is obliquely upwards and circularly and repeatedly rotated is arranged at one aligned side of each fiber conveying elbow, the fiber catching curtain is provided with fiber catching angle nails, fiber layers output from outlets on one side, which are aligned with the fiber conveying bent pipe, of the fiber catching curtain keep a certain inclined included angle, the fiber catching angle nails on the fiber catching curtain are driven by a transmission mechanism to circularly and reciprocally rotate from bottom to top, fiber equalizing rollers are arranged above the top end of the fiber catching curtain, when in use, cotton fiber flow output by a free carding mixer is conveyed into a cotton mixing machine through a fiber conveying pipe, a blocking plate in the fiber conveying pipe above each cotton bin is controlled by a photoelectric control device to ascend, the ascending height of the blocking plate is increased along with the increase of the distance between the cotton bin and the input direction of the cotton fiber flow, meanwhile, fiber output ports of the fiber conveying pipe above each cotton bin are controlled by the photoelectric control device to be in an open state, so that the high-speed moving cotton fiber flow in the fiber conveying pipe is blocked by the blocking plate, and part of the cotton fibers in the thickness direction of the cotton fiber flow are impacted in the blocking process, in the impacting process, impurities pass through a filter screen of a baffle plate and then enter an impurity collecting net due to the large inertia of the impurities, so that the impurity removing effect is realized, meanwhile, the impacting effect directly enables fibers in a cotton fiber flow to be further dispersed, so that the impacting and opening effect is realized, the impacted cotton fibers fall into cotton bins along fiber output ports under the action of self gravity, then, the cotton bins obtain cotton fibers at different sections along the thickness direction of the cotton fiber flow, when the fiber height in the cotton bins reaches a controlled height, stripping roller pairs at the bottom of the cotton bins are driven by a transmission mechanism to start working, at the moment, stripping rollers arranged in the left side and the right side in parallel of the stripping roller pairs rotate clockwise, stripping rollers on the right side synchronously rotate anticlockwise, so that the cotton fibers in the cotton bins are stripped, and the stripped cotton fibers fall into fiber conveying bent pipes, the cotton fibers output from the outlets of the fiber conveying bent pipes are overlapped into a cotton fiber layer, because the lengths of the fiber conveying bent pipes are different, the cotton fibers in the fiber layers at the junction are fibers with different conveying lengths, the cotton fibers intercepted at different sections are mixed under the conveying of different lengths, the cotton fiber layer formed by the junction is simultaneously grabbed along the thickness direction of the fiber layer by fiber grabbing corner nails on a fiber grabbing curtain, so that the fiber layers transversely paved are effectively mixed under the longitudinal simultaneous grabbing, the cotton fibers grabbed by the fiber grabbing corner nails are driven by the fiber grabbing curtain to be conveyed upwards, the cotton fibers at the thicker part of the fiber layer in the conveying process are hit by rotating fiber equalizing rollers, the uniform finishing effect of the fiber layer is realized, and the uniformly finished fiber flow is conveyed into a cotton cleaner by corresponding conveying pipelines, the cotton cleaner comprises an upper cotton box, the upper cotton box is in a hollow cuboid shape, the top end of the upper cotton box is connected with a conveying pipeline communicated with the cotton mixer, a left horizontal conveying curtain and a right horizontal conveying curtain which are horizontally aligned from left to right are arranged at the bottom of the upper cotton box, the left horizontal conveying curtain circularly and reciprocally rotates from right to left, the right horizontal conveying curtain circularly and reciprocally rotates from left to right, a left cotton grabbing corner nail and a right cotton grabbing corner nail are respectively arranged on the left horizontal conveying curtain and the right horizontal conveying curtain, a left vertical conveying curtain in a vertical state is arranged at the left side surface of the upper cotton box, a right vertical conveying curtain in a vertical state is arranged at the right side surface of the upper cotton box, the left vertical conveying curtain and the right vertical conveying curtain are driven by a transmission mechanism to circularly and reciprocally rotate from bottom to top, a left connecting pipe is arranged at the left side of the left vertical conveying curtain, a right connecting pipe is arranged at the right side of the right vertical conveying curtain, a gathering roller pair is arranged at the bottoms of the left horizontal conveying curtain and the right horizontal conveying curtain, the gathering roller pair comprises a left gathering roller and a right gathering roller which are large in diameter and keep a left-right alignment, the upper portion of the left gathering roller and the lower output port of the left connecting pipe are kept in an aligned state, the upper portion of the right gathering roller and the lower output port of the right connecting pipe are kept in an aligned state, a holding roller pair is arranged on the lower portion of the gathering roller pair and comprises a left holding roller and a right holding roller which are small in diameter and keep a left-right alignment, a holding carding roller is arranged on the lower portion of the holding roller pair and driven to rotate by a transmission mechanism, holding opening card clothing is wrapped on the surface of the holding carding roller, a fiber holding impurity removing device is arranged on the lower portion of the holding carding roller, uniformly arranged fiber flow is sent into an upper cotton box through a conveying pipeline, and when the height of cotton fiber entering the upper cotton box reaches a set height, a left horizontal conveying device at the bottom of the upper cotton box, The left and right circular rotation of the right horizontal conveying curtain drives the cotton fiber layer falling into the upper cotton box to contact with the left vertical conveying curtain and the right vertical conveying curtain of the upper cotton box respectively with certain pressure, at the moment, the cotton fibers in the thickness direction of the cotton fiber layer in the upper cotton box are simultaneously grabbed under the driving of the upper circular rotation and the lower circular rotation of the left vertical conveying curtain and the right vertical conveying curtain, so that the effective mixing effect in the grabbing process is realized, the cotton fibers driven by the left vertical conveying curtain and the right vertical conveying curtain are driven to the outward side of the left vertical conveying curtain and the outward side of the right vertical conveying curtain, the cotton fibers driven to the outward side by the left vertical conveying curtain directly enter the left connecting pipe, fall onto the left gathering roller through the left connecting pipe, are driven by the rotating left gathering roller to enter between the gathering roller, the cotton fibers driven to the outward side by the right vertical conveying curtain directly enter the right connecting pipe, the cotton fiber collecting device falls onto a right collecting roller through a right connecting pipe and is driven by the rotating right collecting roller to enter between the collecting roller pair, so that the cotton fiber is collected through the collecting roller pair, the collected cotton fiber directly enters between the holding roller pair and is held and output through the holding roller pair, in the holding and output process of the cotton fiber, one end of the fiber receives the striking action of holding and opening card clothing of the rotating holding and carding roller under the held state, so that the holding and striking opening of the cotton fiber are realized, the cotton fiber which is held, struck and opened is transferred onto the holding and carding roller and is driven to rotate by the holding and carding roller, the cotton fiber rotates to the other side of the holding and carding roller after surrounding the holding and carding roller for one circle under the supporting action of a fiber supporting and impurity removing device at the bottom of the holding and carding roller, and the held, struck and opened cotton fiber flow is sent into a special fiber removing machine through a conveying pipeline, identifying and removing non-cotton fiber in a foreign fiber removing machine, separating and removing fine dust by strong dust removal to obtain cotton fiber flow for carding processing,

the second step is that: carding into strips, directly conveying the cotton fiber flow prepared in the first step into a carding machine through a conveying pipeline, obtaining strip cotton slivers through a carding machine, in the carding process, uniformly inputting the cotton fiber flow after finishing through the holding action of a pressing piece, in the process, the other end of the cotton fiber flow receives the gradual striking of a sawtooth beater on a holding and opening roller under the state that one end of the cotton fiber flow is held, so that the gradual opening action of the sawtooth beater on the fibers from beating loosening to penetrating carding is realized, the gradually opened cotton fibers are completely transferred onto the holding and opening roller along with the continuous input, the cotton fibers on the holding and opening roller are then completely stripped by a free carding roller horizontally and closely arranged with the holding and opening roller, the transfer of the cotton fibers from the holding and opening roller to the free carding roller is realized, the cotton fibers transferred onto the free carding roller are conveyed between the free carding roller and an upper free carding cover under the driving of the free carding roller, free carding card clothing is arranged on the free carding roller and the free carding cover, the free carding card clothing on the free carding roller and the free carding card clothing on the free carding cover respectively grab the cotton fibers between the free carding roller and the free carding cover, the cotton fibers are decomposed under the grabbing action of the free carding card clothing and the free carding cover simultaneously, the free carding of the cotton fibers is realized, the cotton fibers are repeatedly transferred between the free carding roller and the free carding cover for a plurality of times, the free carding action for a plurality of times is realized in the repeated transfer process until the cotton fibers are decomposed into a single fiber state, the cotton fibers which are freely carded rotate along with the rotation of the free carding roller, when the cotton fibers rotate to a condensing roller part which is arranged in parallel at the left and the right and is close to the free carding roller, the condensing card clothing on the condensing roller applies grabbing acting force to the cotton fibers, so that part of the cotton fibers on the free carding roller is transferred to the condensing roller, the cotton fiber which is not transferred to the condensing roller continuously rotates along with the rotation of the free carding roller, when the cotton fiber rotates to the bottom of the free carding roller, the cotton fiber is transferred between the free carding roller and the free carding cover again under the supporting action of a fiber supporting and impurity removing device arranged at the bottom of the free carding roller for free carding, the fiber supporting and impurity removing device has the impact action on impurities in the cotton fiber and the fiber supporting and impurity removing device in the supporting and holding process of the fiber, so that the centrifugal force of the impurities is changed in direction, the impurities fall down along the gap between the fiber supporting and impurity removing device under the action of large centrifugal force, so that the impurity removal of the cotton fiber is realized, the cotton fiber transferred to the condensing roller is condensed into a cotton fiber net on the condensing roller with small diameter, and the cotton fiber net is sent into a horn mouth after being peeled by the peeling roller and then is condensed into cotton fiber strips, pressing and finishing the cotton fiber strips to obtain required cotton slivers, winding the cotton slivers, and winding the wound cotton slivers in a hollow cotton sliver can;

the third step: twisting to form yarns, performing combing preparation and combing on the cotton raw strips prepared in the second step to obtain cotton combed strips, finishing the cotton combed strips by a drawing frame to obtain cotton drawn strips with improved linear density uniformity, and performing roving and spinning on the cotton drawn strips in sequence to obtain the required pure cotton high-quality combed yarns; the method comprises the following steps of pre-drawing cotton slivers to obtain cotton pre-drawing strips with line density uniformity changed, feeding 8 cotton slivers together in the process, combining the fed 8 cotton slivers, drafting by 8 times to obtain required cotton pre-drawing strips, pre-drawing the cotton strips, then winding the cotton pre-drawing strips to obtain cotton rolls with a roll structure with a certain width, feeding 24 cotton pre-drawing strips together in the process, combining all the fed cotton pre-drawing strips into cotton rolls with a certain width after weak drafting by 1.5 times, winding the cotton rolls to obtain cotton combed rolls with improved uniformity, feeding 3-6 cotton rolls together in the process, firstly performing up-and-down combination on the fed cotton rolls under a pressing acting force to obtain large cotton rolls with large line density, thus, the uniformity of the cotton rolls is further improved in the merging process, and then the large cotton rolls are drafted by 2-4 times to obtain the cotton combed rolls with reduced linear density and improved fiber straightness; the combed cotton rolls are combed to obtain a combed cotton strip with improved fiber straightening degree and reduced short staple fibers, in the combing process, the combed cotton rolls are fed through panel groups arranged up and down, in the process, the lower panel moves back and forth to support the combed cotton rolls, the upper panel moves back and forth, the distance between the upper panel and the lower panel is gradually reduced in the advancing process, the distance between the upper panel and the lower panel is gradually increased in the retreating process, the upper panel and the lower panel are gradually closed in the advancing process to gradually convey and hold the cotton fibers between the upper panel and the lower panel, the other ends of the cotton fibers are held and combed by a rotating cylinder under the holding effect, the hook parts in the fibers are straightened under the combing effect, meanwhile, part of the shorter cotton fibers are combed under the combing effect, the cotton fibers which are held and combed are combined with the poured cotton fibers by an inverted roller, and the transfer output of the held and combed cotton fibers is realized, the upper and lower embedded plates are gradually opened in the backward moving process so as to continuously support and convey the subsequently fed cotton combed rolls, the cotton fibers output by the separating roller are pressed and then become the cotton half-slivers, and the cotton half-slivers output by 8 carding mechanisms of the comber are drafted and then recombined so as to obtain the required cotton combed slivers; the cotton combed strips are arranged by two drawing frames to obtain cotton drawn strips with improved linear density uniformity, 6 cotton combed strips are fed together in the first drawing, the fed 6 cotton combed strips are firstly drafted and then combined to obtain cotton half-drawn strips, 6 cotton half-drawn strips are fed together in the second drawing, the fed 6 cotton half-drawn strips are pressed by a detection pressing roller with a pressure sensing device after being combined, so that the linear density of the fed combined cotton half-drawn strips is detected by the pressure sensing device in the pressing process, the combined cotton half-drawn strips enter a drafting system, the drafting system comprises a rear lower roller, a middle lower roller and a front lower roller, a rear upper rubber roller is arranged on the rear lower roller, a middle rear upper rubber roller and a middle front upper rubber roller are arranged on the middle lower roller, a front upper rubber roller is arranged on the front lower roller, the rear lower roller is driven to rotate by a single first motor, the front lower roller is driven by an independent second motor to rotate, the middle lower roller is in transmission connection with the front lower roller through a gear, a pressure sensing signal obtained by detection of the pressing roller is transmitted to the first motor through the operation unit, when the obtained pressure sensing signal is smaller than a predicted pressure value, the first motor accelerates, so that the drafting multiple of the drafting system is reduced, when the obtained pressure sensing signal is larger than the predicted pressure value, the first motor decelerates, so that the drafting multiple of the drafting system is increased, then intelligent adjustment of the drafting multiple of the drafting system according to the linear density of the fed cotton half-cooked sliver is realized, and the uniformity of the linear density of the output cotton half-cooked sliver is further improved; the rough cotton yarn with required linear density and certain strength is obtained after the rough cotton sliver is subjected to rough cotton yarn, the rough cotton yarn comprises drafting, twisting and winding, the fed rough cotton sliver firstly enters a drafting system, cotton fibers in the rough cotton sliver perform speed change movement from slow to fast under the action of the drafting, so that the linear density is reduced under the action of the speed change, meanwhile, due to the difference of friction acting force borne by one fiber in the speed change process, different speed changes occur at different positions on the fiber, then, the fiber generates speed difference of relative movement in different speed changes, the straightening action of the fiber is further realized, the rough cotton sliver is drafted to obtain cotton slivers with certain linear density, the cotton slivers output by the drafting system then pass through a rotating hollow copper pipe, the twisting action on the cotton slivers is realized under the action of the rotation of the copper pipe, and the cotton fibers in the cotton slivers are transferred under the twisting action, then the cotton fibers are mutually intertwined, so that a certain cohesive acting force is generated among the cotton fibers, then the cotton roving with certain strength is obtained, and the prepared cotton roving is driven by the rotating copper pipe and then is continuously wound on the copper pipe; the cotton roving is firstly fed into a drafting system, the cotton fiber in the cotton roving performs variable speed motion from slow to fast under the combined action of the drafting acting force of a roller and the mutual friction acting force of the fibers in the cotton roving, so that the linear density is reduced under the variable speed action, meanwhile, the different speed changes occur at different positions on the fiber due to the different friction acting forces on one fiber in the variable speed process, so that the fiber generates the speed difference of relative motion at different speed changes, the straightening action of the fiber is realized, the cotton roving is drafted to obtain cotton fiber strips with a certain linear density, the cotton fiber strips output by the drafting system are driven by a rotating bobbin to correspondingly rotate, and in the bobbin driving process, the yarn simultaneously passes through the steel wire ring with certain weight on the steel collar, so that the rotating speed of the yarn is lower than that of the bobbin, the rotating speed difference between the yarn and the steel wire ring has a twisting twist action on the yarn, the twisting twist is transmitted along the yarn from bottom to top, the twisting of cotton fiber strips output by the drafting system is realized, fibers in the cotton fiber strips are mutually transferred under the twisting action, the cotton fibers are mutually wound under the transferring action, and then the cotton fibers generate larger cohesive force, so that the cotton combed yarn with certain strength is obtained, and the cotton combed yarn is synchronously wound on the bobbin under the twisting action.

Claims

1. The production method of the pure cotton high-quality combed yarn is characterized in that three cotton fibers are sequentially subjected to fiber blending, carding into slivers and twisting into yarn to obtain the pure cotton high-quality combed yarn, and the production method comprises the following steps: in the fiber mixing process, cotton picked by a Xinjiang machine, Brazilian cotton and Shandong cotton are respectively grabbed by respective cotton grabbers, the grabbed cotton fibers are respectively subjected to impurity separation by a multifunctional separator and are conveyed to three fiber input ports of a free carding mixer through a conveying pipeline, then the three cotton fibers are driven by negative pressure airflow to axially rotate and forwardly convey along the surface of a free carding roller which keeps rotating in the free carding mixer, a first arc-shaped rail, a second arc-shaped rail and a third arc-shaped rail which are generated by the driving of the negative pressure airflow and are communicated with the three fiber input ports are respectively arranged on the surface of the free carding roller, the three arc-shaped rails are axially and radially arranged along the surface of the free carding roller and encircle the surface of the free carding roller for 3-6 circles, the three arc-shaped rails are firstly a large-bending arc-shaped rail, the radian of which is less than 2 circumferences between a starting point and an end point and are not intersected with each other, Then, any two arc tracks are intersected at least twice, and finally, three arc tracks are intersected at one point, three cotton fibers are independently moved along the surface of the free carding roller through the large arc of each arc track in a free state, so that the free beating of carding card clothing on the surface of the free carding roller is received in the moving process to realize sufficient free opening action, then the small arc of each arc track moves along the surface of the free carding roller to realize free opening, the collision among the fibers at the intersection is realized to realize collision opening and mixing, finally the fibers are converged at the convergence point of the arc tracks and are sent into a cotton mixer through a conveying pipeline, and after being blocked by a collision port at the upper part of each cotton bin in the cotton mixer, the blocked fibers flow through the collision opening and fall into the corresponding cotton bin, then, the acquisition of different sections of fibers along the thickness direction of the fiber flow by the cotton bins is realized, simultaneously, massive impurities enter the impact port due to the large inertia effect in the impact process so as to realize the impurity removal effect, the fibers in the cotton bins are respectively stripped by the stripping roller pairs and then enter the 90-degree bent pipes with different lengths, and are output to form fiber layers at the alignment outlets of the bent pipes, the fiber layers are grabbed along the thickness direction by the fiber grabbing curtains and then are sent to the cotton cleaner by the conveying pipeline, so that the further uniform mixing is realized, the cotton fibers firstly fall into the upper cotton box of the cotton cleaner, and the fiber layers are contacted with the vertically arranged conveying curtains circularly rotated from bottom to top in the left side and the right side in the upper cotton box under certain pressure under the driving of the conveying curtains circularly rotated from left side to right side arranged at the bottom of the upper cotton box respectively, so as to realize the grabbing of the fibers along the thickness direction of the fiber layers, the captured fibers enter a large-diameter gathering roller pair which is arranged in parallel at the left and the right through a connecting pipe opening to be gathered, then are held and output through a small-diameter holding roller pair, striking and opening of opening card clothing on a holding carding roller below the holding roller are received in the holding and output process, complete transfer is realized, the transferred fibers are subjected to impurity removal through an impurity removal device below the holding carding roller and then are sent into a foreign fiber remover of a cotton cleaner through a conveying pipeline to be subjected to non-cotton fiber identification and removal, and then fine dust is separated and removed through strong dust removal to obtain a cotton fiber flow; in the carding and slivering process, cotton fibers flow through a carding machine to be held, loosened, finely carded, condensed into a net and gathered into slivers to obtain cotton slivers; in the twisting and yarn forming process, the cotton raw sliver is combed to obtain the cotton combed sliver, the cotton combed sliver is finished by the drawing frame to obtain the cotton drawn sliver with improved linear density uniformity, and the cotton drawn sliver is sequentially subjected to roving and spinning to obtain the pure cotton high-quality combed yarn.

2. The method for producing high-quality pure cotton combed yarn according to claim 1, wherein three cotton fibers with production places of Xinjiang, Shandong and Brazilian are selected for mixing in fiber mixing, wherein the machine-harvested cotton in the Xinjiang production place has low impurity content and short fiber content but more neps, so that Brazilian cotton with less neps is mixed to control nep content, the Shandong cotton is used for controlling production cost, has more short neps and thick fibers, and in order to ensure the quality of raw cotton, the proportion of the Shandong cotton is controlled within 10% during mixing, the proportion of the Brazilian cotton is controlled between 20% and 30%, and the proportion of the Xinjiang cotton is controlled between 60% and 80%; the method comprises the steps that three cotton fibers which are selected and matched are respectively grabbed by a cotton grabbing machine, the cotton fibers are placed in a hollow disc in the grabbing process, a cotton grabbing beater above the disc is in contact with the cotton fibers in the disc under certain pressure, a sawtooth beater on the cotton grabbing beater rotates along the circumferential direction of a cotton grabbing roller, the cotton fibers in contact with the cotton grabbing beater are beaten and loosened, partial cotton fibers are transferred to the cotton grabbing beater under the beating action, the cotton fibers are loosened and grabbed, the cotton grabbing beater rotates along the circumferential direction of the disc at the same time, the continuous grabbing of the cotton fibers in the disc is achieved, the three cotton fibers after grabbing are respectively conveyed to a multi-function separator through a conveying pipeline to separate and remove heavy objects and impurities, in the process, iron materials in the cotton fibers are separated and removed through a bridge type magnet device, and massive impurities in the fibers are separated and removed from the cotton fibers due to the action of large centrifugal force in the high-speed turning process through a bent pipe structure with the turning degree larger than 180 degrees Clearing; then, the three cotton fibers are jointly sent into a free carding mixer; the free carding mixer comprises a closed hollow cylinder, a free carding roller is arranged in the hollow cylinder, two ends of the free carding roller are fixedly connected to the side surface of the hollow cylinder through bearings, free carding card clothing is arranged on the surface circumference of the free carding roller and is wrapped on the free carding roller in a pasting mode, the free carding roller is driven to rotate by a transmission mechanism, a first fiber input port, a second fiber input port and a third fiber input port which are arranged in parallel are arranged on one side, close to the rear, of the upper side surface of the hollow cylinder, a fiber output port is arranged on one side, close to the front, of the upper side surface of the hollow cylinder, a first arc-shaped rail, a second arc-shaped rail and a third arc-shaped rail are arranged between the first fiber input port and the fiber output port, the three arc-shaped rails are intersected at the fiber output port, and the arc length of a large-bending arc-shaped roller is larger than the circumference of one cross section circumference of the free carding roller and smaller than the circumference of one cross section of the free carding roller The length of the free carding roller is 2 times longer, the arc length of the small bending arc is smaller than the circumference of one cross section circumference of the free carding roller, a fiber supporting device is arranged at the bottom of the free carding roller, fibers can circularly move around the surface of the free carding roller under the supporting action of the fiber supporting device, impurities in the fibers fall and are separated from the fibers due to the gravity of the impurities in the fibers in the supporting process, three cotton fibers are respectively conveyed to a first fiber input port, a second fiber input port and a third fiber input port of the free carding machine through conveying pipelines, cotton fibers entering from the first fiber input port are axially rotated and radially advanced along a first arc track under the action of negative pressure airflow, cotton fibers entering from the second fiber input port are axially rotated and radially advanced along a second arc track, cotton fibers entering from the third fiber input port are axially rotated and radially advanced along a third arc track, in the process, three cotton fibers move along the surface of the free carding roller through the large curved arcs of the respective arc tracks independently in a free state, so that free striking of the free carding card clothing on the surface of the free carding roller is received in the moving process to realize sufficient free opening effect, the rotating speed of the free carding roller is higher than the rotating speed of the cotton fibers along the axial direction of the surface of the free carding roller, the free carding card clothing and the fibers rotate relatively in the axial direction, then the free carding card clothing strikes the fibers, so that opening of the fibers is realized under the striking effect, then the three cotton fibers move along the surface of the free carding roller through the small curved arcs of the respective arc tracks respectively in a free state, and the rotating speed of the free carding roller in the process is lower than the rotating speed of the cotton fibers along the axial direction of the surface of the free carding roller, the free carding card clothing and the fibers axially rotate relatively to realize striking and opening of the fibers, the two fibers are collided at the intersection of the two arc-shaped rails under high-speed motion, opening and mixing under collision are realized in the collision process, the mixed fibers are randomly distributed and then continuously move along the corresponding arc-shaped rails respectively, the cotton fibers of the three arc-shaped rails are converged at a fiber output port, mutual impact action of the three is generated in the convergence process, so that the fibers are further struck and opened, mutual permeation is realized among the fibers in the mutual impact process, so that permeation and mixing action of the three cotton fibers is realized, and the converged cotton fiber flow is sent into a cotton mixing machine through a conveying pipeline; the cotton mixing machine comprises 6-8 cotton bins, the cotton bins are cuboids with hollow structures and open upper side surfaces and lower side surfaces, fiber conveying pipes are arranged above the cotton bins, photoelectric control fiber output ports are arranged at the bottoms of the fiber conveying pipes right above the cotton bins, high-degree photoelectric control barrier plates are arranged on the fiber conveying pipes in front of the fiber output ports, filter screens are arranged at the centers of the barrier plates, impurity collecting nets are arranged behind one sides of the filter screens, stripping roller pairs are arranged on the lower side surfaces of the cotton bins and driven by a transmission mechanism to rotate, fiber conveying bent pipes are arranged at the bottoms of the cotton bins, the fiber conveying bent pipes are 90-degree bent pipes, one sides of the fiber conveying bent pipes are vertically aligned with the stripping roller pairs on the lower side surfaces of the cotton bins, the other sides of the fiber conveying bent pipes are horizontally aligned, fiber catching curtains which are inclined upwards and keep circulating and reciprocating rotation are arranged at the aligned sides of the fiber conveying bent pipes, the fiber grabbing curtain is provided with fiber grabbing angle nails, the fiber layer output from the outlet at one side, which is aligned with the fiber conveying bent pipe, of the fiber grabbing curtain keeps an inclined included angle, the fiber grabbing angle nails on the fiber grabbing curtain are driven by a transmission mechanism to circularly and reciprocally rotate from bottom to top, the fiber equalizing roller is arranged above the top end of the fiber grabbing curtain, when in use, cotton fiber flow output by the free carding mixer is conveyed into the cotton mixing machine through a fiber conveying pipe, the blocking plates in the fiber conveying pipes above the cotton bins are controlled by a photoelectric control device to ascend, the ascending height of the blocking plates is increased along with the increase of the distance between the cotton bins and the input direction of the cotton fiber flow, meanwhile, the fiber output ports of the fiber conveying pipes above the cotton bins are controlled by the photoelectric control device to be in an open state, so that the high-speed moving cotton fiber flow in the fiber conveying pipes is blocked by the blocking plates, and part of the cotton fibers in the thickness direction of the cotton fiber flow are impacted in the blocking process, in the impacting process, impurities pass through a filter screen of a baffle plate and then enter an impurity collecting net due to the large inertia of the impurities, so that the impurity removing effect is realized, meanwhile, the impacting effect directly enables fibers in a cotton fiber flow to be further dispersed, so that the impacting and opening effect is realized, the impacted cotton fibers fall into cotton bins along fiber output ports under the action of self gravity, then, the cotton bins obtain cotton fibers at different sections along the thickness direction of the cotton fiber flow, when the fiber height in the cotton bins reaches a controlled height, stripping roller pairs at the bottom of the cotton bins are driven by a transmission mechanism to start working, at the moment, stripping rollers arranged in the left side and the right side in parallel of the stripping roller pairs rotate clockwise, stripping rollers on the right side synchronously rotate anticlockwise, so that the cotton fibers in the cotton bins are stripped, and the stripped cotton fibers fall into fiber conveying bent pipes, the cotton fibers output from the outlets of the fiber conveying bent pipes are overlapped into a cotton fiber layer, because the lengths of the fiber conveying bent pipes are different, the cotton fibers in the fiber layers at the junction are fibers with different conveying lengths, the cotton fibers intercepted at different sections are mixed under the conveying of different lengths, the cotton fiber layer formed by the junction is simultaneously grabbed along the thickness direction of the fiber layer by fiber grabbing corner nails on a fiber grabbing curtain, so that the fiber layers transversely paved are effectively mixed under the longitudinal simultaneous grabbing, the cotton fibers grabbed by the fiber grabbing corner nails are driven by the fiber grabbing curtain to be conveyed upwards, part of the cotton fibers with thick fiber layers in the conveying process are hit by rotating fiber equalizing rollers, the uniform finishing effect of the fiber layers is realized, and the uniformly finished fiber flow is conveyed into a cotton cleaner by corresponding conveying pipelines, the cotton cleaner comprises an upper cotton box, the upper cotton box is in a hollow cuboid shape, the top end of the upper cotton box is connected with a conveying pipeline communicated with the cotton mixer, a left horizontal conveying curtain and a right horizontal conveying curtain which are horizontally aligned from left to right are arranged at the bottom of the upper cotton box, the left horizontal conveying curtain circularly and reciprocally rotates from right to left, the right horizontal conveying curtain circularly and reciprocally rotates from left to right, a left cotton grabbing corner nail and a right cotton grabbing corner nail are respectively arranged on the left horizontal conveying curtain and the right horizontal conveying curtain, a left vertical conveying curtain in a vertical state is arranged at the left side surface of the upper cotton box, a right vertical conveying curtain in a vertical state is arranged at the right side surface of the upper cotton box, the left vertical conveying curtain and the right vertical conveying curtain are driven by a transmission mechanism to circularly and reciprocally rotate from bottom to top, a left connecting pipe is arranged at the left side of the left vertical conveying curtain, a right connecting pipe is arranged at the right side of the right vertical conveying curtain, a gathering roller pair is arranged at the bottoms of the left horizontal conveying curtain and the right horizontal conveying curtain, the gathering roller pair comprises a left gathering roller and a right gathering roller which are large in diameter and keep a left-right alignment, the upper portion of the left gathering roller and the lower output port of the left connecting pipe are kept in an aligned state, the upper portion of the right gathering roller and the lower output port of the right connecting pipe are kept in an aligned state, a holding roller pair is arranged on the lower portion of the gathering roller pair and comprises a left holding roller and a right holding roller which are small in diameter and keep a left-right alignment, a holding carding roller is arranged on the lower portion of the holding roller pair and driven to rotate by a transmission mechanism, holding opening card clothing is wrapped on the surface of the holding carding roller, a fiber holding impurity removing device is arranged on the lower portion of the holding carding roller, uniformly arranged fiber flow is sent into an upper cotton box through a conveying pipeline, and when the height of cotton fiber entering the upper cotton box reaches a set height, a left horizontal conveying device at the bottom of the upper cotton box, The left and right circular rotation of the right horizontal conveying curtain drives the cotton fiber layer falling into the upper cotton box to contact with the left vertical conveying curtain and the right vertical conveying curtain of the upper cotton box respectively with certain pressure, at the moment, the cotton fibers in the thickness direction of the cotton fiber layer in the upper cotton box are simultaneously grabbed under the driving of the upper circular rotation and the lower circular rotation of the left vertical conveying curtain and the right vertical conveying curtain, so that the effective mixing effect in the grabbing process is realized, the cotton fibers driven by the left vertical conveying curtain and the right vertical conveying curtain are driven to the outward side of the left vertical conveying curtain and the outward side of the right vertical conveying curtain, the cotton fibers driven to the outward side by the left vertical conveying curtain directly enter the left connecting pipe, fall onto the left gathering roller through the left connecting pipe, are driven by the rotating left gathering roller to enter between the gathering roller, the cotton fibers driven to the outward side by the right vertical conveying curtain directly enter the right connecting pipe, the cotton fiber collecting device falls onto a right collecting roller through a right connecting pipe and is driven by the rotating right collecting roller to enter between the collecting roller pair, so that the cotton fiber is collected through the collecting roller pair, the collected cotton fiber directly enters between the holding roller pair and is held and output through the holding roller pair, in the holding and output process of the cotton fiber, one end of the fiber receives the striking action of holding and opening card clothing of the rotating holding and carding roller under the held state, so that the holding and striking opening of the cotton fiber are realized, the cotton fiber which is held, struck and opened is transferred onto the holding and carding roller and is driven to rotate by the holding and carding roller, the cotton fiber rotates to the other side of the holding and carding roller after surrounding the holding and carding roller for one circle under the supporting action of a fiber supporting and impurity removing device at the bottom of the holding and carding roller, and the held, struck and opened cotton fiber flow is sent into a special fiber removing machine through a conveying pipeline, the non-cotton fibers are identified and removed in the foreign fiber removing machine, and then the cotton fiber flow which can be used for carding processing is obtained after the micro-dust is separated and removed through strong dust removal.

3. The method for producing a high-quality pure cotton combed yarn according to claim 1, wherein the flow of the cotton fibers obtained in the carding into sliver is directly conveyed into the carding machine through a conveying pipeline, the sliver is obtained through the carding of the carding machine, the flow of the cotton fibers entering the carding machine is uniformly input after being sorted by the holding action of the pressing member, in the process, the flow of the cotton fibers is held at one end, the other end receives the gradual striking of the sawtooth beater on the holding and opening roller, so that the gradual opening action of the sawtooth beater on the fibers from beating loosening to piercing carding is realized, the cotton fibers gradually opened are completely transferred onto the holding and opening roller along with the continuous input, the cotton fibers on the holding and opening roller are then completely stripped by the free carding roller horizontally arranged next to the holding and opening roller, so that the transfer of the cotton fibers from the holding and opening roller to the free carding roller is realized, the cotton fiber transferred to the free carding roller is conveyed to a position between the free carding roller and a free carding cover above the free carding roller under the driving of the free carding roller, free carding card clothing is arranged on the free carding roller and the free carding cover, the free carding card clothing on the free carding roller and the free carding card clothing on the free carding cover respectively grab the cotton fiber, the cotton fiber is decomposed under the grabbing action of the free carding roller and the free carding cover, the free carding of the cotton fiber is realized, the cotton fiber is repeatedly transferred between the free carding roller and the free carding cover for a plurality of times, the free carding action for a plurality of times is realized in the repeated transferring process, until the cotton fiber is decomposed into a single fiber state, the cotton fiber which is freely carded rotates along with the rotation of the free carding roller, when the cotton fiber rotates to a condensing roller part which is arranged in parallel left and right and is abutted against the free carding roller, the condensing card clothing on the condensing roller applies grabbing acting force to cotton fibers, so that part of the cotton fibers on the free carding roller are transferred to the condensing roller, the cotton fibers which are not transferred to the condensing roller continuously rotate along with the rotation of the free carding roller, when the cotton fibers rotate to the bottom of the free carding roller, the cotton fibers are transferred between the free carding roller and the free carding cover again under the supporting action of a fiber supporting and impurity removing device arranged at the bottom of the free carding roller for free carding, impurities in the cotton fibers are impacted with the fiber supporting and impurity removing device in the supporting and holding process of the fibers by the fiber supporting and impurity removing device, so that the centrifugal force of the impurities is changed in direction, the impurities fall down along the gap between the fiber supporting and impurity removing device under the action of large centrifugal force, the impurity removal of the cotton fibers is realized, the cotton fibers transferred to the condensing roller are condensed into a cotton fiber net on the condensing roller with small diameter, the cotton fiber net is sent into the gathering bell mouth after being stripped by the stripping roller and then gathered into a cotton fiber strip, the cotton fiber strip is pressed and arranged to obtain a required cotton sliver, and the cotton sliver is wound in a hollow sliver can after being wound.

4. The method for producing the pure cotton high-quality combed yarn according to claim 1, wherein in the twisting process, the prepared cotton raw sliver is prepared and combed to obtain the cotton combed sliver, the cotton combed sliver is finished by a drawing frame to obtain the cotton drawn sliver with improved linear density uniformity, and the required pure cotton high-quality combed yarn is obtained after the cotton drawn sliver is subjected to roving and spinning in sequence; the method comprises the steps of pre-drawing cotton slivers to obtain cotton pre-drawing strips with improved linear density uniformity, feeding 8 cotton slivers together in the process, combining the fed 8 cotton slivers, drafting by 8 times to obtain the required cotton pre-drawing strips, pre-drawing the cotton slivers, rolling to obtain cotton rolls with a roll structure with certain width, feeding 24 cotton pre-drawing strips together in the process, combining all the fed cotton pre-drawing strips into cotton rolls with certain width after weak drafting by 1.5 times, rolling to obtain cotton combed rolls with improved uniformity, feeding 3-6 cotton rolls together in the process, combining the fed cotton rolls up and down under the action of pressing force to obtain large cotton rolls with high linear density, thus the uniformity of the cotton rolls is further improved in the merging process, and then the large cotton rolls are drafted by 2-4 times to obtain the cotton combed rolls with reduced linear density and improved fiber straightness; the combed cotton rolls are combed to obtain a combed cotton strip with improved fiber straightening degree and reduced short staple fibers, in the combing process, the combed cotton rolls are fed through panel groups arranged up and down, in the process, the lower panel moves back and forth to support the combed cotton rolls, the upper panel moves back and forth, the distance between the upper panel and the lower panel is gradually reduced in the advancing process, the distance between the upper panel and the lower panel is gradually increased in the retreating process, the upper panel and the lower panel are gradually closed in the advancing process to gradually convey and hold the cotton fibers between the upper panel and the lower panel, the other ends of the cotton fibers are held and combed by a rotating cylinder under the holding effect, the hook parts in the fibers are straightened under the combing effect, meanwhile, part of the shorter cotton fibers are combed under the combing effect, the cotton fibers which are held and combed are combined with the poured cotton fibers by an inverted roller, and the transfer output of the held and combed cotton fibers is realized, the upper and lower embedded plates are gradually opened in the backward moving process so as to continuously support and convey the subsequently fed cotton combed rolls, the cotton fibers output by the separating roller are pressed and then become the cotton half-slivers, and the cotton half-slivers output by 8 carding mechanisms of the comber are drafted and then recombined so as to obtain the required cotton combed slivers; the cotton combed strips are arranged by two drawing frames to obtain cotton drawn strips with improved linear density uniformity, 6 cotton combed strips are fed together in the first drawing, the fed 6 cotton combed strips are firstly drafted and then combined to obtain cotton half-drawn strips, 6 cotton half-drawn strips are fed together in the second drawing, the fed 6 cotton half-drawn strips are pressed by a detection pressing roller with a pressure sensing device after being combined, so that the linear density of the fed combined cotton half-drawn strips is detected by the pressure sensing device in the pressing process, the combined cotton half-drawn strips enter a drafting system, the drafting system comprises a rear lower roller, a middle lower roller and a front lower roller, a rear upper rubber roller is arranged on the rear lower roller, a middle rear upper rubber roller and a middle front upper rubber roller are arranged on the middle lower roller, a front upper rubber roller is arranged on the front lower roller, the rear lower roller is driven to rotate by a single first motor, the front lower roller is driven by an independent second motor to rotate, the middle lower roller is in transmission connection with the front lower roller through a gear, a pressure sensing signal obtained by detection of the pressing roller is transmitted to the first motor through the operation unit, when the obtained pressure sensing signal is smaller than a predicted pressure value, the first motor accelerates, so that the drafting multiple of the drafting system is reduced, when the obtained pressure sensing signal is larger than the predicted pressure value, the first motor decelerates, so that the drafting multiple of the drafting system is increased, then intelligent adjustment of the drafting multiple of the drafting system according to the linear density of the fed cotton half-cooked sliver is realized, and the uniformity of the linear density of the output cotton half-cooked sliver is further improved; the rough cotton yarn with required linear density and certain strength is obtained after the rough cotton sliver is subjected to rough cotton yarn, the rough cotton yarn comprises drafting, twisting and winding, the fed rough cotton sliver firstly enters a drafting system, cotton fibers in the rough cotton sliver perform speed change movement from slow to fast under the action of the drafting, so that the linear density is reduced under the action of the speed change, meanwhile, due to the difference of friction acting force borne by one fiber in the speed change process, different speed changes occur at different positions on the fiber, then, the fiber generates speed difference of relative movement in different speed changes, the straightening action of the fiber is further realized, the rough cotton sliver is drafted to obtain cotton slivers with certain linear density, the cotton slivers output by the drafting system then pass through a rotating hollow copper pipe, the twisting action on the cotton slivers is realized under the action of the rotation of the copper pipe, and the cotton fibers in the cotton slivers are transferred under the twisting action, then the cotton fibers are mutually intertwined, so that a certain cohesive acting force is generated among the cotton fibers, then the cotton roving with certain strength is obtained, and the prepared cotton roving is driven by the rotating copper pipe and then is continuously wound on the copper pipe; the cotton roving is firstly fed into a drafting system, the cotton fiber in the cotton roving performs variable speed motion from slow to fast under the combined action of the drafting acting force of a roller and the mutual friction acting force of the fibers in the cotton roving, so that the linear density is reduced under the variable speed action, meanwhile, the different speed changes occur at different positions on the fiber due to the different friction acting forces on one fiber in the variable speed process, so that the fiber generates the speed difference of relative motion at different speed changes, the straightening action of the fiber is realized, the cotton roving is drafted to obtain cotton fiber strips with a certain linear density, the cotton fiber strips output by the drafting system are driven by a rotating bobbin to correspondingly rotate, and in the bobbin driving process, the yarn simultaneously passes through the steel wire ring with certain weight on the steel collar, so that the rotating speed of the yarn is lower than that of the bobbin, the rotating speed difference between the yarn and the steel wire ring has a twisting twist action on the yarn, the twisting twist is transmitted along the yarn from bottom to top, the twisting of cotton fiber strips output by the drafting system is realized, fibers in the cotton fiber strips are mutually transferred under the twisting action, the cotton fibers are mutually wound under the transferring action, and then the cotton fibers generate larger cohesive force, so that the cotton combed yarn with certain strength is obtained, and the cotton combed yarn is synchronously wound on the bobbin under the twisting action.