CN113882050B - Production method of pure cotton high-quality combed yarn - Google Patents

Abstract

The invention discloses a production method of pure cotton high-quality 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 through fibers, mixing the cotton fibers after fully opening the cotton fibers by a free carding mixer, then mixing the cotton fibers through impact, then cutting different sections of the input fiber flow in the thickness direction through impact in a cotton mixer, aligning the cotton fibers after passing through bent pipes with different lengths, outputting the fiber layers to form fiber layers, grabbing the fiber layers in the thickness direction through a grabbing device simultaneously, so that the cotton fibers are mixed again, grabbing the fibers in an upper cotton box of a cotton cleaner along the thickness direction, then gathering, holding, outputting and opening the fibers, further realizing cotton fiber mixing, further realizing uniform mixing effect of the cotton fibers in three different production places in mixing, further reducing cotton mixing grade, reducing production cost, simultaneously realizing uniform mixing of the various cotton fibers in mixing, and effectively improving comprehensive performance.

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 three cotton fibers are fully opened by a free carding mixer and then are mixed by impact, then the three cotton fibers are intercepted at different sections in the thickness direction of the input fiber flow by impact in a cotton mixer, the three cotton fibers are aligned and output to form a fiber layer after passing through bent pipes with different lengths, the fiber layer is grabbed simultaneously in thickness by a grabbing device, so that the cotton fibers are mixed again, the fibers entering an upper cotton box of a cotton picker are grabbed along the thickness direction, gathered and held for output opening, so that the mixing of the cotton fibers is further realized, the uniform mixing effect of the cotton fibers of three different production places is further realized, on one hand, the cotton distribution 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 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 and twisting on three cotton fibers to obtain the pure cotton high-quality combed yarn, grabbing cotton picked by a Xinjiang machine, brazil cotton and Shandong cotton by respective cotton grabbing machines in the fiber blending process, carrying out impurity separation on each grabbed cotton fiber by 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, and arranging 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 air flow and are communicated with the three fiber input ports on the surface of the free carding roller respectively, three arc tracks 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 tracks are firstly a large bending arc with the radian smaller than 2 circumferences between a starting point and an end point and without intersection, then a small bending arc with any two arc tracks intersected at least twice and finally three arc tracks intersected at one point, three cotton fibers move along the surface of the free carding roller through the large bending arcs of the respective arc tracks respectively in a free state, so that the free striking of carding card clothing on the surface of the free carding roller is received in the moving process to realize sufficient free opening effect, and then the small bending arcs of the respective arc tracks move along the surface of the free carding roller to realize free opening on the one hand and realize striking opening and mixing at the intersection through collision among the fibers on the other hand, finally, the fibers are converged at the convergence point of the arc-shaped track and are sent into a cotton mixer through a conveying pipeline, the fibers at the blocked part are blocked by an impact opening at the upper part of each cotton bin in the cotton mixer, the fibers flow through the impact opening and fall into the corresponding cotton bin, and then the fibers at different sections along the thickness direction of the fiber flow are obtained by each cotton bin, simultaneously, blocky impurities enter the impact port due to large inertia effect in the impact process so as to realize the impurity removal effect, fibers in each cotton bin are stripped by stripping roller pairs and then enter 90-degree bent pipes with different lengths, and outputting a fiber layer at the aligned outlet of the elbow pipe, grabbing the fiber layer in the thickness direction by a fiber grabbing curtain, and then sending the fiber layer to a cotton cleaner by a conveying pipeline, thereby realizing further uniform mixing, the cotton fiber firstly falls into the upper cotton box of the scutcher, the fiber layer is contacted with the vertically arranged and circularly rotated conveying curtains from bottom to top arranged at the left side and the right side in the upper cotton box under certain pressure under the driving of the left and the right circularly rotated conveying curtains arranged at the bottom of the upper cotton box in parallel, thereby realizing the grabbing of the fiber along the thickness direction of the fiber layer, the grabbed fiber enters the large-diameter gathering roller pairs which are arranged in parallel from the left and the right through the connecting pipe orifice respectively to be gathered, then, the fibers are held and output by a small-diameter holding roller, striking and opening of opening card clothing on a holding carding roller below the holding carding roller are received in the holding output process, complete transfer is realized, the transferred fibers are subjected to impurity removal by an impurity removal device below the holding carding roller and then are sent into a foreign fiber removal machine of a cotton cleaner by a conveying pipeline for non-cotton fiber identification and removal, and then fine dust is separated and removed by powerful dust removal to obtain a cotton fiber flow; in the step of carding into strips, cotton fibers flow through a carding machine to be held, loosened, finely carded, condensed into nets and gathered into strips, and then cotton slivers are obtained; 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 following 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, 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 at the same time, the continuous grabbing of the cotton fibers in the disc is realized, the three grabbed cotton fibers are respectively conveyed to a multi-function separator through a conveying pipeline 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 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; 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, the free carding card clothing is wrapped on the free carding roller in a sticking 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 back 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 which are generated by negative pressure airflow driving 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, the arc length of a large-bending arc-shaped is larger than the circumference of one cross section circumference of the free carding roller and is smaller than 2 times of the circumference of one cross section of the free carding roller, 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 are separated from the fibers by gravity 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, cotton fibers entering the first fiber input port are axially rotated and radially advanced along a first arc-shaped track under the action of negative pressure airflow, cotton fibers entering the second fiber input port are axially rotated and radially advanced along a second arc-shaped track, the cotton fiber entering from the third fiber input port moves along the third arc-shaped track to carry out axial rotation and radial advance, the three cotton fibers firstly move along the surface of the free carding roller independently and respectively in a free state through the large bending arc of each arc track, 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 the sufficient free opening effect, the rotating speed of the free carding roller in the process is greater than the rotating speed of cotton fibers along the axial direction of the surface of the free carding roller, so that the free carding clothing and the fiber generate relative rotation in the axial direction, and then the free carding clothing generates striking effect on the fiber, so that the opening of the fiber is realized under the striking action, then the three cotton fibers move along the surface of the free carding roller through the small bending arcs of the arc tracks respectively in a free state, and the rotating speed of the free carding roller in the process is less than the rotating speed of the cotton fiber along the axial direction of the surface of the free carding roller, thereby leading the free carding card clothing and the fiber to generate relative rotation in the axial direction, further realizing the striking and opening of the fiber, simultaneously, the two fibers collide with each other at the intersection of the two arc-shaped tracks under high-speed motion, the opening and mixing under the impact are realized in the collision process, the mixed fibers are randomly distributed and then continuously and respectively move along the corresponding arc-shaped tracks, the cotton fibers of the three arc-shaped tracks are converged at the fiber output port, the mutual impact action of the three is generated in the converging process, so that the fibers are further opened by impact, and the mutual penetration between the fibers is generated in the mutual impact process, thereby realizing the permeation mixing action of the three cotton fibers, 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 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 sent into the cotton mixing machine through a fiber conveying pipe, the barrier plates in the fiber conveying pipes above the cotton bins are controlled by the photoelectric control device to ascend, the ascending height of the barrier 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 cotton fiber flow moving at high speed in the fiber conveying pipes is blocked by the barrier plates, the device has the advantages that impact action is generated on partial cotton fibers in the thickness direction of the cotton fiber flow in the blocking process, impurities pass through the filter screen of the blocking plate and then enter the impurity collecting net due to the large inertia of the impurities in the impact process, impurity removal is achieved, meanwhile, the impact action directly enables the fibers in the cotton fiber flow to be further dispersed, impact opening is achieved, the impacted cotton fibers fall into the cotton bin along a fiber output port under the action of self gravity, cotton fibers in different sections in the thickness direction of the cotton fiber flow are obtained through the cotton bins, when the fiber height in the cotton bin reaches a controlled height, the stripping roller pairs at the bottom of the cotton bins are driven by a transmission mechanism to start working, the stripping rollers on the left side and the stripping rollers on the right side which are arranged in parallel at the moment rotate clockwise, and the stripping rollers on the right side rotate anticlockwise synchronously, thereby the cotton fiber in the cotton bin is stripped off, the stripped cotton fiber falls into the fiber conveying elbow pipe and moves along the fiber conveying elbow pipe under the drive of air flow until the cotton fiber is conveyed to the outlet of the elbow pipe, the cotton fiber output from the outlet of each fiber conveying elbow pipe is overlapped into a cotton fiber layer, because the lengths of the fiber conveying elbow pipes are different, the cotton fiber in the fiber layer at the junction is the fiber which undergoes different conveying lengths, then the mixing effect that the cotton fiber intercepted at different sections undergoes the conveying under the different lengths is realized, the cotton fiber layer formed by the confluence is simultaneously grabbed along the thickness direction of the fiber layer by the fiber grabbing angle nail on the fiber grabbing curtain, the effective mixing that the fiber layer which is transversely layered is longitudinally and simultaneously grabbed is realized, the cotton fiber grabbed by the fiber grabbing angle nail is driven by the fiber grabbing curtain to be upwards conveyed, and part of the cotton fiber layer which is thick in the fiber layer is beaten by the rotating fiber equalizing roller during the conveying process, thereby realizing the uniform arrangement effect of the fiber layer, the uniformly arranged fiber flow is sent into the scutcher by a corresponding conveying pipeline, the scutcher comprises an upper cotton box which is in a cuboid shape with a hollow structure, the top end of the upper cotton box is connected with the conveying pipeline communicated with the cotton mixer, the bottom of the upper cotton box is provided with a left horizontal conveying curtain and a right horizontal conveying curtain which are horizontally arranged in a left-right alignment way, the left horizontal conveying curtain circularly rotates back and forth from right to left, the right horizontal conveying curtain circularly rotates back and forth from left to right, a left cotton grabbing spike and a right cotton grabbing spike are respectively arranged on the left horizontal conveying curtain and the right horizontal conveying curtain, the left vertical conveying curtain which is in a vertical state is arranged at the left side surface of the upper cotton box, the right vertical conveying curtain which is 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 rotate back and forth from bottom to top, the left side of the left vertical conveying curtain is provided with a left connecting pipe, the right side of the right vertical conveying curtain is provided with a right connecting pipe, the bottoms of the left horizontal conveying curtain and the right horizontal conveying curtain are provided with a gathering roller pair, the gathering roller pair comprises a left gathering roller and a right gathering roller which are large in diameter and keep the left and right alignment, the upper part of the left gathering roller and the lower output port of the left connecting pipe are kept in an aligned state, the upper part of the right gathering roller and the lower output port of the right connecting pipe are kept in an aligned state, the lower part of the gathering roller pair is provided with a holding roller pair, the holding roller pair comprises a left holding roller and a right holding roller which are small in diameter and keep the left and right alignment, the lower part of the holding roller pair is provided with a holding carding roller, the holding carding roller is driven to rotate by a transmission mechanism, the surface of the holding carding roller is wrapped with holding needle cloth, the lower part of the holding carding roller is provided with a fiber holding impurity removing device, the fiber flow which is evenly arranged is sent into the upper cotton box by a conveying pipeline, when the height of the cotton fiber which enters the upper cotton box reaches the set height, the left horizontal conveying curtain and the right horizontal conveying curtain at the bottom of the upper cotton box are driven by the left and right circular rotation of the left and right horizontal conveying curtains, so that the cotton fiber layer which falls into the upper cotton box is respectively contacted with the left and right vertical conveying curtains of the upper cotton box under certain pressure, the cotton fiber in the thickness direction of the cotton fiber layer in the upper cotton box is simultaneously grabbed under the driving of the upper and lower circular rotation of the left and right vertical conveying curtains, thereby realizing the effective mixing effect in the grabbing process, the cotton fiber which is driven by the left and right vertical conveying curtains is driven to the outward side of the left vertical conveying curtain and the outward side of the right vertical conveying curtain, the cotton fiber which is driven to the outward side by the left vertical conveying curtain is directly sent into the left connecting pipe, and falls onto the left gathering roller through the left connecting pipe, is driven by the rotating left gathering roller to enter between the gathering roller pairs, is driven by the right vertical conveying curtain to directly enter into the right connecting pipe to the cotton fiber on the outward side, falls onto the right gathering roller through the right connecting pipe, is driven by the rotating right gathering roller to enter between the gathering roller pairs, so that the gathering of the cotton fiber is realized through the gathering roller pairs, the gathered cotton fiber directly enters between the gripping roller pairs, is gripped and output through the gripping roller pairs, in the gripping and output process of the cotton fiber, one end of the fiber receives the action of gripping and opening needle cloth of the rotating gripping and carding roller under the gripped state, thereby realizing the gripping and opening striking of the cotton fiber, and the gripping and striking cotton fiber is transferred onto the gripping and carding roller along with the continuous conveying of the cotton fiber, the holding carding roller drives the holding carding roller to rotate, cotton fibers rotate to the other side of the holding carding roller after surrounding the holding carding roller for a circle under the holding action of the fiber holding impurity removal device at the bottom of the holding carding roller, a held, beaten and loosened cotton fiber stream is sent into the foreign fiber removal machine through a conveying pipeline, non-cotton fiber identification and removal are carried out in the foreign fiber removal machine, and then the cotton fiber stream which can be used for carding processing is obtained after micro-dust separation and removal are carried out through powerful 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 completing the free carding 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 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 the fiber supporting and impurity removing device arranged at the bottom of the free carding roller to be freely carded, the fiber supporting and impurity removing device performs impact action on impurities in the cotton fibers and the fiber supporting and impurity removing device in the supporting and holding process of the fibers, so that the centrifugal force of the impurities is changed, the impurities fall down along the gap between the fiber supporting and the impurity removing device under the action of large centrifugal force, the impurities in the cotton fibers are removed, the cotton fibers transferred to the condensing roller are condensed into a cotton fiber net, the cotton fiber net is conveyed to a condensing horn mouth after being peeled by the peeling action of the condensing roller to form cotton fiber strips, the required cotton fiber strips are obtained after being pressed and are wound in a cotton strip winding drum.

In twisting resultant yarn, the prepared cotton raw sliver is combed to obtain cotton combed sliver, the cotton combed sliver is combed by a drawing frame to obtain 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 following 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, winding to obtain a cotton roll with a roll-shaped structure with a certain width, feeding 24 cotton pre-drawing strips together in the process, combining all the fed cotton pre-drawing strips into a cotton roll with a certain width after weak drafting by 1.5 times, winding to obtain a cotton combed roll with improved uniformity, feeding 3-6 cotton rolls together in the process, combining the fed cotton rolls up and down under a pressing action force to obtain a large cotton roll with high linear density, further improving the uniformity of the cotton rolls in the combining process, and drafting by 2-4 times to obtain a combed cotton roll with reduced linear density and improved fiber straightness; the combed cotton rolls are combed to obtain cotton combed strips 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, a lower panel plays a supporting role in the back and forth movement of the combed cotton rolls, an 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 so as to gradually convey and hold the cotton fibers between the upper panel and the lower panel, under the holding role, the other ends of the cotton fibers are held and combed by a rotating cylinder, under the combing role, a hook part in the fibers is straightened, meanwhile, under the combing role, part of shorter cotton fibers are combed, the cotton fibers which are combed are then combined by an inverted roller, so that the transfer output of the cotton fibers which are held and combed is achieved, the upper panel and the lower panel are gradually opened in the retreating process so as to continuously hold the combed cotton rolls, the cotton rolls are continuously output, and the combed cotton fibers are pressed into half combed strips, so that the half strips are output by the combed cotton strips, and the combed strips are fed again, and then the half combed cotton strips are output by the combed cotton sliver mechanism; finishing cotton combed strips by two drawing frames to obtain cotton drawn strips with improved linear density uniformity, feeding 6 cotton combed strips together in a first drawing, drawing and then combining the fed 6 cotton combed strips respectively to obtain cotton half-drawn strips, feeding 6 cotton half-drawn strips together in a second drawing, pressing the 6 cotton half-drawn strips by a detection pressing roller with a pressure sensing device after combination, detecting the linear density of the fed combined cotton half-drawn strips by the pressure sensing device in the pressing process, feeding the combined cotton half-drawn strips into a drawing system, wherein the drawing 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 and 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 by an independent first motor to rotate, 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 pair 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, so that the intelligent adjustment of the drafting multiple of the drafting system according to the linear density of the fed cotton half-cooked slivers is realized, and the uniformity of the linear density of the output cotton half-cooked slivers is further improved; the method comprises the following steps that a cotton drawn sliver is subjected to roving to obtain a cotton roving with required linear density and certain strength, the roving comprises drafting, twisting and winding, the fed cotton drawn sliver firstly enters a drafting system, cotton fibers in the cotton drawn sliver perform speed change motion from slow to fast under the action of drafting, so that the linear density is reduced under the action of speed change, meanwhile, due to the difference of friction acting force on 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 motion in different speed changes, so that the fiber straightening action is realized, the cotton drawn sliver is subjected to drafting to cotton fiber with certain linear density, the cotton fiber sliver output by the drafting system then passes through a rotating hollow copper pipe, the twisting action on the cotton fiber is realized under the action of rotation of the copper pipe, the cotton fibers in the cotton fiber sliver are transferred under the action of twisting action, so that the cotton fibers are intertwined mutually, so that certain cohesive acting force is generated between the cotton fibers, then the cotton roving is obtained, the prepared cotton roving is continuously driven by the copper pipe; the cotton roving is subject to spinning to obtain cotton combed yarn with required linear density and certain strength, the spinning comprises drafting and twisting, the fed cotton roving firstly enters a drafting system, the cotton fiber in the cotton roving generates variable speed movement 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 time variable speed is generated at each position on the fiber due to the different friction acting forces on one fiber in the variable speed process, so that the fiber generates relative movement speed difference in different time variable speeds, the fiber straightening action is realized, and the cotton roving obtains cotton slivers with certain linear density after being drafted, the cotton slivers output by the drafting system are driven by the rotating bobbin to correspondingly rotate, in the process of driving the bobbin, the yarn simultaneously passes through a steel wire ring with certain weight on a steel collar, so that the rotating speed of the yarn is smaller than that of the bobbin, the rotating speed difference between the yarn and the bobbin generates twisting twist action on the yarn, the twisting twist is transmitted along the yarn from bottom to top, the twisting of the cotton slivers output by the drafting system is realized, fibers in the cotton slivers are mutually transferred under the twisting action, the cotton fibers are mutually wound under the transferring action, and then larger cohesive force is generated between the cotton fibers, 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 beneficial effects that: the method of the invention fully opens three cotton fibers through a free carding mixer and then mixes the fibers through impact, then the fibers are intercepted at different sections in the thickness direction of the input fiber flow through impact in a cotton mixer, the fibers are aligned and output to form a fiber layer after passing through bent pipes with different lengths, the fiber layer is grabbed simultaneously in thickness through a grabbing device, thereby realizing the secondary mixing of the cotton fibers, the fibers entering an upper cotton box of a cotton cleaner are grabbed along the thickness direction and then gathered together and then held for output opening, thereby further realizing the mixing of the cotton fibers, further realizing the uniform mixing effect of the cotton fibers of three different production places, further reducing the cotton distribution grade and the production cost on one hand, and realizing the uniform mixing of the various cotton fibers to be mixed on the other hand, thereby effectively improving the comprehensive performance of spun yarns.

Detailed Description

The following examples further illustrate the present invention but are not to be construed as limiting thereof. 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 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 percent of Xinjiang cotton, 25 percent of Brazilian cotton and 10 percent of Shandong cotton, mixing the three cotton fibers, grabbing the three cotton fibers by a bale plucker in sequence, sending the cotton fibers into a free carding mixer for mixing, mixing the cotton fibers again by a cotton mixer, holding and opening the cotton fibers by a cotton cleaner to obtain a cotton fiber flow; in the cotton grabbing process, three cotton fibers which are 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 in 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 action of beating, the cotton fibers are loosened and grabbed, meanwhile, the cotton grabbing beater rotates in the circumferential direction of the disc, so that the cotton fibers in the disc are continuously grabbed, the three grabbed cotton fibers are respectively conveyed to a multi-function separator through a conveying pipeline 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 blocks 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 degree larger than 180 degrees; 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 sticking mode, the free carding roller is driven by a transmission mechanism to rotate, 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 which are generated by driving of negative pressure airflow are arranged between the first fiber input port and the fiber output port, three arc tracks are arranged along the surface of the free carding roller axially and radially so as to surround 3-6 circles on the surface of the free carding roller, the three arc tracks are firstly a large arc which has radian smaller than 2 circumference ratios between a starting point and an end point and does not intersect with each other, then a small 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 arc is larger than the perimeter of one cross section circumference of the free carding roller and smaller than 2 times of the perimeter of one cross section circumference of the free carding roller, the arc length of the small arc is smaller 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, and the fibers can perform surrounding motion around the surface of the free carding roller under the supporting effect of the fiber supporting device, meanwhile, in the supporting process, impurities in the fibers fall and are separated from the fibers due to the larger gravity of the impurities in the fibers, 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 airflow, the cotton fibers entering the first fiber input port are axially rotated and radially advanced along a first arc-shaped track, the cotton fibers entering the second fiber input port are axially rotated and radially advanced along a second arc-shaped track, the cotton fibers entering the third fiber input port are axially rotated and radially advanced 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 respective arc-shaped track in a free state, therefore, 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 generate relative rotation in the axial direction, the free carding card clothing generates beating effect on the fibers, the fibers are opened under the beating effect, then the three cotton fibers move along the surface of the free carding roller through the small bending arcs of the arc-shaped rails respectively 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 in the process, so that the free carding card clothing and the fibers generate relative rotation in the axial direction, the beating and opening of the fibers are realized, and simultaneously the collision under high-speed motion occurs at the intersection of the two arc-shaped rails, the opening and mixing under impact are realized in the collision process, the mixed fibers are randomly distributed and then continuously and respectively move along the corresponding arc-shaped tracks, the cotton fibers of the three arc-shaped tracks are converged at a fiber output port, the mutual impact action of the three is generated in the convergence process, so that the fibers are further impacted and opened under the impact action, the fibers are mutually permeated in the mutual impact process, the permeation and mixing action of the three cotton fibers are 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 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 output port 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 output port, a filter screen is arranged at 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 bent pipe is arranged at the bottom of each cotton bin, the fiber conveying bent pipe is a 90-degree bent pipe, one side of each fiber conveying bent pipe is vertically aligned with the stripping roller pair on the lower side surface of each cotton bin, the other side of each fiber conveying bent pipe is horizontally aligned, the fiber grabbing curtain which is inclined upwards and keeps rotating in a circulating and reciprocating way is arranged at one side of each fiber conveying bent pipe which is aligned with the fiber conveying bent pipe, a fiber grabbing corner nail is arranged on the fiber grabbing curtain, a fiber layer output from an outlet at one side of the fiber grabbing curtain which is aligned with the fiber conveying bent pipe keeps a certain inclined included angle, the fiber grabbing corner nail on the fiber grabbing curtain is driven by a transmission mechanism to rotate in a circulating and reciprocating way from bottom to top, a fiber equalizing roller is arranged above the top end of the fiber grabbing curtain, when the fiber grabbing roller is used, a cotton fiber flow output by a free carding mixer is sent into a cotton mixer 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, and meanwhile, a fiber output port of the fiber conveying pipe above each cotton bin is controlled to be in an opened state by the photoelectric control device, so that the cotton fiber flow moving at high speed in the fiber conveying pipe is blocked by the blocking plate, partial cotton fibers in the thickness direction of the cotton fiber flow are impacted in the blocking process, impurities pass through the filter screen of the blocking plate and then enter the impurity collecting net due to the large inertia of the impurities in the impacting process, the impurity removing effect is realized, meanwhile, the fibers in the cotton fiber flow are further dispersed by the impacting effect directly, the impact opening effect is realized, the impacted cotton fibers fall into the cotton bins along the fiber output port under the action of the gravity of the cotton fibers, the cotton bins acquire the cotton fibers in different sections in the thickness direction of the cotton fiber flow, when the fiber height in the cotton bins reaches a controlled height, the stripping roller pairs at the bottom of the cotton bins are driven by the transmission mechanism to start working, the stripping rollers on the left side and the right side which are arranged in parallel at the moment rotate clockwise, the stripping rollers on the right side synchronously rotate anticlockwise, thereby the cotton fiber in the cotton storehouse is stripped, the stripped cotton fiber falls into the fiber conveying elbow pipe and moves along the fiber conveying elbow pipe under the drive of air flow until the cotton fiber is conveyed to the outlet of the elbow pipe, the cotton fiber output from the outlet of each fiber conveying elbow pipe is overlapped into a cotton fiber layer, because the lengths of the fiber conveying elbow pipes are different, the cotton fiber in the fiber layer at the junction is the fiber which experiences different conveying lengths, then the mixing effect that the cotton fiber intercepted at different sections experiences the different length conveying is realized, the cotton fiber layer formed by the junction is simultaneously grabbed along the thickness direction of the fiber layer by the fiber grabbing corner nail on the fiber grabbing curtain, the effective mixing that the fiber layer transversely paved longitudinally and simultaneously grabbed is realized, the cotton fiber grabbed by the fiber grabbing corner nail is driven by the fiber grabbing curtain to upwards convey, the cotton fibers at the thicker part of the fiber layer are beaten by the rotating uniform fiber roller in the conveying process, so that the uniform arrangement effect of the fiber layer is realized, the uniformly arranged fiber flow is sent into the cotton picker by a corresponding conveying pipeline, the cotton picker comprises an upper cotton box, the upper cotton box is in a cuboid shape of a hollow structure, the top end of the upper cotton box is connected with the conveying pipeline communicated with the cotton mixer, the bottom of the upper cotton box is provided with a left horizontal conveying curtain and a right horizontal conveying curtain which are horizontally arranged in a left-right alignment manner, the left horizontal conveying curtain circularly rotates from right to left in a reciprocating manner, the right horizontal conveying curtain circularly rotates from left to right in a reciprocating manner, 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 face of the upper cotton box, a right vertical conveying curtain in a vertical state is arranged at the right side face 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, the left side of the left vertical conveying curtain is provided with a left connecting pipe, the right side of the right vertical conveying curtain is provided with a right connecting pipe, the bottoms of the left horizontal conveying curtain and the right horizontal conveying curtain are provided with a gathering roller pair, the gathering roller pair comprises a left gathering roller and a right gathering roller which are large in diameter and keep the left and right in alignment, the upper part of the left gathering roller and the lower output port of the left connecting pipe are kept in an aligned state, the upper part of the right gathering roller and the lower output port of the right connecting pipe are kept in an aligned state, the lower part of the gathering roller pair is provided with a holding roller pair, the holding roller pair comprises a left holding roller and a right holding roller which are small in diameter and keep the left and right in alignment, the lower part of the holding roller pair is provided with a holding carding roller, the holding roller is driven by the transmission mechanism to rotate, the surface of the holding carding roller is wrapped with opening needle cloth, the lower part of the holding carding roller is provided with a fiber holding and impurity removing device, fiber flow which is uniformly arranged is sent into the upper cotton box by a conveying pipeline, when the height of cotton fiber entering the upper cotton box reaches a set height, the left horizontal conveying curtain and the right horizontal conveying curtain at the bottom of the upper cotton box are driven by left and right circulating rotation, so that the cotton fiber layer falling into the upper cotton box is respectively contacted with the left vertical conveying curtain and the right vertical conveying curtain of the upper cotton box under certain pressure, the cotton fiber in the thickness direction of the cotton fiber layer in the upper cotton box is simultaneously grabbed under the driving of the upper and lower circulating rotation of the left vertical conveying curtain and the right vertical conveying curtain, thereby realizing effective mixing effect in the grabbing process, the cotton fiber driven by the left vertical conveying curtain and the right vertical conveying curtain is driven to the outward side of the left vertical conveying curtain and the outward side of the right vertical conveying curtain, the cotton fiber driven to the outward side by the left vertical conveying curtain directly enters the left connecting pipe, falls onto the left gathering roller through the left connecting pipe, is driven by the rotating left gathering roller to enter between the gathering roller pairs, is driven to the outward side by the right vertical conveying curtain directly enters the right connecting pipe, falls onto the right gathering roller through the right connecting pipe, is driven by the rotating right gathering roller to enter between the gathering roller pairs, so that the gathering of the cotton fiber is realized through the gathering roller pairs, the gathered cotton fiber directly enters between the holding roller pairs, is held and output by the holding roller pairs, and in the holding and output process of the cotton fiber, one end of the fiber receives the striking effect of the holding and opening card clothing of the rotating holding and carding roller under the held state, thereby realizing the holding, striking and opening of the cotton fiber, the cotton fiber loosened by holding and striking is transferred to a holding carding roller along with the continuous delivery of the cotton fiber, and is driven to rotate by the holding carding roller, the cotton fiber rotates to the other side of the holding carding roller after surrounding the holding carding roller for a circle under the supporting action of a fiber supporting and impurity removing device at the bottom of the holding carding roller, the cotton fiber flow loosened by holding and striking is sent into a foreign fiber removing machine through a delivery pipeline, the non-cotton fiber is identified and removed in the foreign fiber removing machine, and then the cotton fiber flow used for carding processing is obtained after the separation and removal of micro dust is carried out by strong dust removal,

the second step is that: carding into strips, directly conveying the cotton fiber stream prepared in the first step into a carding machine through a conveying pipeline, preparing strip-shaped cotton strips through a carding machine, uniformly inputting the cotton fiber stream after finishing through the holding action of a pressing piece in the carding process, wherein one end of the cotton fiber stream is held, and the other end of the cotton fiber stream receives the gradual striking of a sawtooth beater on a holding and opening roller, so that the gradual opening action of the sawtooth beater on fibers from striking loosening to penetrating carding is realized, the cotton fibers which are 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 completely stripped by a free carding roller which is 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, 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, thereby transferring part of cotton fibers on the free carding roller to the condensing roller, continuously rotating the cotton fibers which are not transferred to the condensing roller along with the rotation of the free carding roller, when the cotton fibers rotate to the bottom of the free carding roller, enabling the cotton fibers to be 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, and enabling impurities in the cotton fibers to generate impact action 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, the centrifugal force of the impurities is changed, so that the impurities fall down along a gap between the fiber support and the impurity removal device under the action of large centrifugal force, the impurities of the cotton fibers are removed, the cotton fibers transferred to the condensing roller are condensed into a cotton fiber net on the condensing roller with a small diameter, the cotton fiber net is sent into the gathering bell mouth after being peeled by the peeling roller and then is converged into cotton fiber strips, the cotton fiber strips are pressed and arranged to obtain required cotton slivers, and the cotton slivers are wound 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 slivers, then winding the cotton slivers to obtain a cotton roll with a roll-shaped structure with a certain width, feeding 24 cotton pre-drawing strips together in the process, combining all the fed cotton pre-drawing strips into a cotton roll with a certain width after weak drafting by 1.5 times, combining the cotton roll to obtain a cotton combed roll with improved uniformity, feeding 3-6 cotton rolls together in the process, combining the fed cotton rolls up and down under a pressing action force to obtain a large cotton roll with large line density, further improving the uniformity of the cotton roll in the combining process, and obtaining the cotton combed roll with reduced line density and improved fiber straightness after drafting by 2-4 times; the combed cotton rolls are combed to obtain cotton combed strips 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, a lower panel plays a supporting role in the back and forth movement of the combed cotton rolls, an 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 so as to gradually convey and hold the cotton fibers between the upper panel and the lower panel, under the holding role, the other ends of the cotton fibers are held and combed by a rotating cylinder, under the combing role, a hook part in the fibers is straightened, meanwhile, under the combing role, part of shorter cotton fibers are combed, the cotton fibers which are combed are then combined by an inverted roller, so that the transfer output of the cotton fibers which are held and combed is achieved, the upper panel and the lower panel are gradually opened in the retreating process so as to continuously hold the combed cotton rolls, the cotton rolls are continuously output, and the combed cotton fibers are pressed into half combed strips, so that the half strips are output by the combed cotton strips, and the combed strips are fed again, and then the half combed cotton strips are output by the combed cotton sliver mechanism; finishing cotton combed strips by two drawing frames to obtain cotton drawn strips with improved linear density uniformity, feeding 6 cotton combed strips together in a first drawing, drawing and then combining the fed 6 cotton combed strips respectively to obtain cotton half-drawn strips, feeding 6 cotton half-drawn strips together in a second drawing, pressing the 6 cotton half-drawn strips by a detection pressing roller with a pressure sensing device after combination, detecting the linear density of the fed combined cotton half-drawn strips by the pressure sensing device in the pressing process, feeding the combined cotton half-drawn strips into a drawing system, wherein the drawing 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 and 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 by an independent first motor to rotate, 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 pair 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, so that the intelligent adjustment of the drafting multiple of the drafting system according to the linear density of the fed cotton half-cooked slivers is realized, and the uniformity of the linear density of the output cotton half-cooked slivers is further improved; the method comprises the following steps that a cotton drawn sliver is subjected to roving to obtain a cotton roving with required linear density and certain strength, the roving comprises drafting, twisting and winding, the fed cotton drawn sliver firstly enters a drafting system, cotton fibers in the cotton drawn sliver perform speed change motion from slow to fast under the action of drafting, so that the linear density is reduced under the action of speed change, meanwhile, due to the difference of friction acting force on 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 motion in different speed changes, so that the fiber straightening action is realized, the cotton drawn sliver is subjected to drafting to cotton fiber with certain linear density, the cotton fiber sliver output by the drafting system then passes through a rotating hollow copper pipe, the twisting action on the cotton fiber is realized under the action of rotation of the copper pipe, the cotton fibers in the cotton sliver are transferred under the action of twisting action, so that the cotton fibers are intertwined mutually, so that certain cohesive acting force is generated between the cotton fibers, then the cotton roving with certain strength is obtained, and the prepared cotton roving drives the copper pipe to rotate and then the copper pipe to continuously wind the copper pipe; the cotton roving is subject to spinning to obtain cotton combed yarn with required linear density and certain strength, the spun yarn comprises drafting and twisting, the fed cotton roving firstly enters into a drafting system, the cotton fiber in the cotton roving generates variable speed movement 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 of each part on the fiber are generated due to the different friction acting forces on one fiber in the speed change process, so that the speed difference of relative movement is generated in the different speed changes of the fiber, the fiber straightening action is realized, and the cotton roving obtains cotton strands with certain linear density after drafting, the cotton slivers output by the drafting system are driven by the rotating yarn tube to correspondingly rotate, in the process of driving the yarn tube, the yarn simultaneously passes through a steel wire ring with certain weight on a steel collar, so that the rotating speed of the yarn is lower than that of the yarn tube, the rotating speed difference between the yarn and the yarn produces twisting twist action on the yarn, the twisting twist action is transferred from bottom to top along the yarn, twisting of the cotton slivers output by the drafting system is further realized, fibers in the cotton slivers are mutually transferred under the twisting action, mutual winding is carried out between the cotton fibers under the transferring action, and then larger cohesive force is produced between the cotton fibers, so that the cotton combed yarn with certain strength is obtained, and the cotton combed yarn is synchronously wound on the yarn tube under the twisting action.

Claims (4)

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 sliver forming and twisting to form the yarn, so that the pure cotton high-quality combed yarn is prepared, and the 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 track, a second arc-shaped track and a third arc-shaped track which are driven by the negative pressure airflow and are generated and communicated with the three fiber input ports are respectively arranged on the surface of the free carding roller, the three arc-shaped tracks 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 tracks are a large curved arc with radian less than 2 circumferences between a starting point and a terminal point and without intersection, then a small curved arc with any two arc tracks intersected twice, 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 action, then the small curved arcs of each arc track move along the surface of the free carding roller to realize free opening on one hand, and collision between the fibers at the intersection position to realize collision and opening and mixing on the other hand, finally the fibers are converged at the confluence point of the arc tracks and sent into a cotton mixer through a conveying pipeline, and the fibers of the blocked part flow through the collision opening and fall into a corresponding cotton bin after being blocked by a collision opening at the upper part of each cotton bin in the cotton mixer, 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 pipelines, 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 which are arranged at the left side and the right side in the upper cotton box under certain pressure under the driving of the conveying curtains which are arranged at the bottom of the upper cotton box and rotate circularly from bottom to top respectively in a left side and a right side, the grabbed fibers enter the large-diameter gathering rollers which are arranged in parallel from the left and the right through connecting pipe orifices to be gathered, then are held and output through the small-diameter holding rollers, 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 an impurity removal device below the holding carding roller and then are sent into a foreign fiber removing machine 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 step of carding into strips, cotton fibers flow through a carding machine to be held, loosened, finely carded, condensed into nets and gathered into strips, and then cotton slivers are obtained; 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 following 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, 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, meanwhile, the cotton grabbing beater rotates along the circumferential direction of the disc, the continuous grabbing of the cotton fibers in the disc is realized, the three grabbed cotton fibers are respectively conveyed to a multi-function separator through a conveying pipeline to separate and remove heavy object impurities, iron materials in the cotton fibers are separated and removed through a bridge type magnet device in the process, and blocky impurities in the fibers are separated and removed from the cotton fibers under 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; 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, the free carding card clothing is wrapped on the free carding roller in a sticking 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 back 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 which are generated by negative pressure airflow driving 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, the arc length of a large-bending arc-shaped is larger than the circumference of one cross section circumference of the free carding roller and is smaller than 2 times of the circumference of one cross section of the free carding roller, 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 make a circular motion around the surface of the free carding roller under the supporting action of the fiber supporting device, impurities in the fibers are separated from the fibers by gravity 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, cotton fibers entering from the first fiber input port are made to axially rotate and radially advance along a first arc track under the action of negative pressure airflow, cotton fibers entering from the second fiber input port are made to axially rotate and radially advance along a second arc track under the action of negative pressure airflow, and the cotton fibers entering from the first fiber input port are made to axially rotate and radially advance along the second arc track, the cotton fiber entering from the third fiber input port moves along the third arc-shaped track to carry out axial rotation and radial advance, the three cotton fibers firstly move along the surface of the free carding roller independently and respectively through the large bending arcs of the arc tracks, so that the free beating of the free carding clothing on the surface of the free carding roller is received in the moving process to realize the sufficient free opening function, the rotating speed of the free carding roller is higher than the rotating speed of cotton fiber along the axial direction of the surface of the free carding roller in the process, so that the free carding clothing and the fiber generate relative rotation in the axial direction, and then the free carding clothing generates striking effect on the fiber, so that the opening of the fiber is realized under the action of striking, and then the three cotton fibers move along the surface of the free carding roller through the small bending arcs of the respective arc tracks in a free state, and the rotating speed of the free carding roller in the process is less than the rotating speed of the cotton fiber along the axial direction of the surface of the free carding roller, thereby leading the free carding card clothing and the fiber to generate relative rotation in the axial direction, further realizing the striking and opening of the fiber, simultaneously, the two fibers collide with each other at the intersection of the two arc-shaped tracks under high-speed motion, the opening and mixing under the impact are realized in the collision process, the mixed fibers are randomly distributed and then continuously and respectively move along the corresponding arc-shaped tracks, the cotton fibers of the three arc-shaped tracks are converged at the fiber output port, the mutual impact action of the three is generated in the converging process, so that the fibers are further opened by impact, and the mutual penetration between the fibers is generated in the mutual impact process, thereby realizing the permeation mixing action of the three cotton fibers, 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 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 sent into the cotton mixing machine through a fiber conveying pipe, the barrier plates in the fiber conveying pipes above the cotton bins are controlled by the photoelectric control device to ascend, the ascending height of the barrier 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 cotton fiber flow moving at high speed in the fiber conveying pipes is blocked by the barrier plates, the device has the advantages that impact action is generated on partial cotton fibers in the thickness direction of the cotton fiber flow in the blocking process, impurities pass through the filter screen of the blocking plate and then enter the impurity collecting net due to the large inertia of the impurities in the impact process, impurity removal is achieved, meanwhile, the impact action directly enables the fibers in the cotton fiber flow to be further dispersed, impact opening is achieved, the impacted cotton fibers fall into the cotton bin along a fiber output port under the action of self gravity, cotton fibers in different sections in the thickness direction of the cotton fiber flow are obtained through the cotton bins, when the fiber height in the cotton bin reaches a controlled height, the stripping roller pairs at the bottom of the cotton bins are driven by a transmission mechanism to start working, the stripping rollers on the left side and the stripping rollers on the right side which are arranged in parallel at the moment rotate clockwise, and the stripping rollers on the right side rotate anticlockwise synchronously, thereby the cotton fiber in the cotton bin is stripped off, the stripped cotton fiber falls into the fiber conveying elbow pipe and moves along the fiber conveying elbow pipe under the drive of air flow until the cotton fiber is conveyed to the outlet of the elbow pipe, the cotton fiber output from the outlet of each fiber conveying elbow pipe is overlapped into a cotton fiber layer, because the lengths of the fiber conveying elbow pipes are different, the cotton fiber in the fiber layer at the junction is the fiber which undergoes different conveying lengths, then the mixing effect that the cotton fiber intercepted at different sections undergoes the conveying under the different lengths is realized, the cotton fiber layer formed by the confluence is simultaneously grabbed along the thickness direction of the fiber layer by the fiber grabbing angle nail on the fiber grabbing curtain, the effective mixing that the fiber layer which is transversely layered is longitudinally and simultaneously grabbed is realized, the cotton fiber grabbed by the fiber grabbing angle nail is driven by the fiber grabbing curtain to be upwards conveyed, and part of the cotton fiber layer which is thick in the fiber layer is beaten by the rotating fiber equalizing roller during the conveying process, thereby realizing the uniform arrangement effect of the fiber layer, the uniformly arranged fiber flow is sent into the scutcher by a corresponding conveying pipeline, the scutcher comprises an upper cotton box which is in a cuboid shape with a hollow structure, the top end of the upper cotton box is connected with the conveying pipeline communicated with the cotton mixer, the bottom of the upper cotton box is provided with a left horizontal conveying curtain and a right horizontal conveying curtain which are horizontally arranged in a left-right alignment way, the left horizontal conveying curtain circularly rotates back and forth from right to left, the right horizontal conveying curtain circularly rotates back and forth from left to right, a left cotton grabbing spike and a right cotton grabbing spike are respectively arranged on the left horizontal conveying curtain and the right horizontal conveying curtain, the left vertical conveying curtain which is in a vertical state is arranged at the left side surface of the upper cotton box, the right vertical conveying curtain which is 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 rotate back and forth from bottom to top, the left side of the left vertical conveying curtain is provided with a left connecting pipe, the right side of the right vertical conveying curtain is provided with a right connecting pipe, the bottoms of the left horizontal conveying curtain and the right horizontal conveying curtain are provided with a gathering roller pair, the gathering roller pair comprises a left gathering roller and a right gathering roller which are large in diameter and keep left and right alignment, the upper part of the left gathering roller is kept in alignment with the lower output port of the left connecting pipe, the upper part of the right gathering roller is kept in alignment with the lower output port of the right connecting pipe, the lower part of the gathering roller pair is provided with a holding roller pair, the holding roller pair comprises a left holding roller and a right holding roller which are small in diameter and keep left and right alignment, the lower part of the holding roller pair is provided with a holding carding roller, the holding carding roller is driven to rotate by a transmission mechanism, the surface of the holding carding roller is wrapped with a holding card clothing, the lower part of the holding carding roller is provided with a fiber supporting and impurity removing device, the fiber flow which is evenly arranged is sent into the upper cotton box by a conveying pipeline, when the height of the cotton fiber which enters the upper cotton box reaches the set height, the left horizontal conveying curtain and the right horizontal conveying curtain at the bottom of the upper cotton box are driven by the left and right circular rotation of the left and right horizontal conveying curtains, so that the cotton fiber layer which falls into the upper cotton box is respectively contacted with the left and right vertical conveying curtains of the upper cotton box under certain pressure, the cotton fiber in the thickness direction of the cotton fiber layer in the upper cotton box is simultaneously grabbed under the driving of the upper and lower circular rotation of the left and right vertical conveying curtains, thereby realizing the effective mixing effect in the grabbing process, the cotton fiber which is driven by the left and right vertical conveying curtains is driven to the outward side of the left vertical conveying curtain and the outward side of the right vertical conveying curtain, the cotton fiber which is driven to the outward side by the left vertical conveying curtain is directly sent into the left connecting pipe, the cotton fiber is driven to the outward side by the right vertical conveying curtain and directly enters the right connecting pipe, and then falls onto the right gathering roller through the right connecting pipe and is driven by the rotating right gathering roller to enter the space between the pair of gathering rollers, so that the gathering of the cotton fiber is realized by the pair of gathering rollers, the gathered cotton fiber directly enters the space between the pair of holding rollers, and is held and output by the pair of holding rollers, in the holding and output process of the cotton fiber, one end of the fiber receives the striking effect of holding and opening card clothing of the rotating holding carding roller under the holding state, thereby realizing the holding, striking and opening of the cotton fiber, along with the continuous conveying of the cotton fiber, the cotton fiber which is held, struck and opened is transferred to the holding carding roller, the holding carding roller drives the holding carding roller to rotate, cotton fibers rotate to the other side of the holding carding roller after surrounding the holding carding roller for a circle under the holding action of the fiber holding impurity removal device at the bottom of the holding carding roller, a held, beaten and loosened cotton fiber stream is sent into the foreign fiber removal machine through a conveying pipeline, non-cotton fiber identification and removal are carried out in the foreign fiber removal machine, and then the cotton fiber stream which can be used for carding processing is obtained after micro-dust separation and removal are carried out through powerful 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, the 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 to realize the free carding of the cotton fiber, meanwhile, the cotton fiber is repeatedly transferred between the free carding roller and the free carding cover for a plurality of times, thereby realizing the free carding function for a plurality of times in the repeated transferring process until the cotton fiber is decomposed into a single fiber state, the cotton fiber which finishes the free carding rotates along with the rotation of the free carding roller, when the cotton fiber collecting device rotates to a condensing roller part which is close to the free carding roller and is arranged in parallel from left to right, 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 fiber collecting device rotates 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 collided 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, the impurities fall along a gap between the fiber supporting and impurity removing device under the action of large centrifugal force, the impurities in the cotton fibers are removed, the cotton fibers on the condensing roller are condensed into a cotton fiber net, the cotton fiber net is conveyed to a cotton fiber collecting ring after the stripping action, and the cotton fiber collecting bar is wound in a cotton bar winding drum, and the cotton bar is collected.

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 following 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, winding to obtain a cotton roll with a roll-shaped structure with a certain width, feeding 24 cotton pre-drawing strips together in the process, combining all the fed cotton pre-drawing strips into a cotton roll with a certain width after weak drafting by 1.5 times, winding to obtain a cotton combed roll with improved uniformity, feeding 3-6 cotton rolls together in the process, combining the fed cotton rolls up and down under a pressing action force to obtain a large cotton roll with high linear density, further improving the uniformity of the cotton rolls in the combining process, and drafting by 2-4 times to obtain a combed cotton roll with reduced linear density and improved fiber straightness; the combed cotton rolls are combed to obtain cotton combed strips 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, a lower panel plays a supporting role in the back and forth movement of the combed cotton rolls, an 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 so as to gradually convey and hold the cotton fibers between the upper panel and the lower panel, under the holding role, the other ends of the cotton fibers are held and combed by a rotating cylinder, under the combing role, a hook part in the fibers is straightened, meanwhile, under the combing role, part of shorter cotton fibers are combed, the cotton fibers which are combed are then combined by an inverted roller, so that the transfer output of the cotton fibers which are held and combed is achieved, the upper panel and the lower panel are gradually opened in the retreating process so as to continuously hold the combed cotton rolls, the cotton rolls are continuously output, and the combed cotton fibers are pressed into half combed strips, so that the half strips are output by the combed cotton strips, and the combed strips are fed again, and then the half combed cotton strips are output by the combed cotton sliver mechanism; 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 respectively drawn and then combined to obtain cotton semi-drawn strips, 6 cotton semi-drawn strips are fed together in the second drawing, the fed 6 cotton semi-drawn strips are combined and then pressed by a detection pressing roller with a pressure sensing device, so that the linear density of the combined cotton semi-drawn strips is detected by the pressure sensing device in the pressing process, the combined cotton semi-drawn strips enter a drawing system, the drawing 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 an independent first motor, the front lower roller is driven to rotate by an independent second motor, 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, and then the intelligent adjustment of the drafting multiple of the drafting system according to the linear density of the fed cotton half-cooked sliver is realized, so that the uniformity of the linear density of the output cotton half-cooked sliver is further improved; the method comprises the following steps that a cotton drawn sliver is subjected to roving to obtain a cotton roving with required linear density and certain strength, the roving comprises drafting, twisting and winding, the fed cotton drawn sliver firstly enters a drafting system, cotton fibers in the cotton drawn sliver perform speed change motion from slow to fast under the action of drafting, so that the linear density is reduced under the action of speed change, meanwhile, due to the difference of friction acting force on 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 motion in different speed changes, so that the fiber straightening action is realized, the cotton drawn sliver is subjected to drafting to cotton fiber with certain linear density, the cotton fiber sliver output by the drafting system then passes through a rotating hollow copper pipe, the twisting action on the cotton fiber is realized under the action of rotation of the copper pipe, the cotton fibers in the cotton fiber sliver are transferred under the action of twisting action, so that the cotton fibers are intertwined mutually, so that certain cohesive acting force is generated between the cotton fibers, then the cotton roving is obtained, the prepared cotton roving is continuously driven by the copper pipe; the cotton roving is subject to spinning to obtain cotton combed yarn with required linear density and certain strength, the spun yarn comprises drafting and twisting, the fed cotton roving firstly enters into a drafting system, the cotton fiber in the cotton roving generates variable speed movement 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 of each part on the fiber are generated due to the different friction acting forces on one fiber in the speed change process, so that the speed difference of relative movement is generated in the different speed changes of the fiber, the fiber straightening action is realized, and the cotton roving obtains cotton strands with certain linear density after drafting, the cotton slivers output by the drafting system are driven by the rotating bobbin to correspondingly rotate, in the process of driving the bobbin, the yarn simultaneously passes through a steel wire ring with certain weight on a steel collar, so that the rotating speed of the yarn is smaller than that of the bobbin, the rotating speed difference between the yarn and the bobbin generates twisting twist action on the yarn, the twisting twist is transmitted along the yarn from bottom to top, the twisting of the cotton slivers output by the drafting system is realized, fibers in the cotton slivers are mutually transferred under the twisting action, the cotton fibers are mutually wound under the transferring action, and then larger cohesive force is generated between the cotton fibers, 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.