Production method of heating blended yarn and blending roller pair matched with heating blended yarn

Abstract

The invention discloses a production method of heating blended yarns and a matched blending roller pair, and the method comprises the following steps: arranging the blending roller pair comprising a blending lower roller and a blending upper roller at the rear part of a drafting system of a drawing frame for mixed drawing, and realizing controllable selective feeding of acrylic carded slivers and viscose carded slivers to prepare nitrile viscose slivers; the acrylic fibers and the mucilage glue are mixed in the longitudinal direction of the length direction of the acrylic adhesive strip, then the acrylic fibers and the mucilage glue are drafted and fine-drawn through the drafting system and then combined again to obtain the acrylic adhesive mixed strip, the acrylic fibers and the mucilage glue are mixed in the transverse direction of the axial direction of the acrylic adhesive mixed strip, and then the acrylic fibers and the mucilage glue are mixed more evenly and consistently. Therefore, the production of the heating blended yarn with more consistent functionality is realized.

Description

Technical Field

[0001] The present invention relates to the field of new yarns, and specifically to a production method of a heat - generating blended yarn and a matching mixing roller pair for the same. Background Art

[0002] With the development of social economy and the continuous improvement of people's living standards, for clothing textiles, in addition to pursuing wearing comfort, people are increasingly concerned about their fashionability and functionality, and pursue unique styles and various functions, such as antibacterial, antistatic and other functions. To meet this demand of consumers, continuously developing new - type yarns and fabrics has become an important task in the textile industry. With the development of science and technology, the competition in the textile market is becoming increasingly fierce. In order to pursue the maximization of profits, each manufacturer is continuously developing in the direction of high - grade, high - taste, high - technical content and high added - value.

[0003] At present, functional fabrics mainly endow fabrics with additional functions in addition to their own use values through two methods. The first is to select functional fibers as raw materials for yarn processing and then weave, and the second is to perform functional post - finishing on the fabrics.

[0004] With the continuous emergence of various functional fibers, the first method has gradually become the most main production method at present. At the same time, compared with post - finishing, the first method has the advantages of being more environmentally friendly and having better wearing properties of the fabric.

[0005] As a new type of functional fabric, heat - generating fabrics have been promoted from the clothing field of mountaineers to the general consumer field and have become the new favorite in the thermal underwear industry. Therefore, the quality and functionality requirements for heat - generating fabrics have also increased relatively. Therefore, how to produce a heat - generating blended yarn with excellent comprehensive yarn quality and more consistent functionality is a problem that needs to be solved at present. Summary of the Invention

[0006] Object of the Invention: To provide a production method of a heat - generating blended yarn and a matching mixing roller pair for the same. By setting a mixing roller pair including a mixing lower roller and a mixing upper rubber roller at the rear of the drafting system of a drawing frame for mixing and drawing, controlled selective feeding of acrylic carded sliver and viscose carded sliver is realized to obtain an acrylic - viscose sliver, so as to realize the longitudinal mixing of acrylic and viscose along the length direction of the acrylic - viscose sliver. Then, after being drawn and thinned by the drafting system and re - combined, an acrylic - viscose blended sliver is obtained, and the transverse mixing of acrylic and viscose along the axial direction of the acrylic - viscose blended sliver is realized. Subsequently, more uniform and consistent mixing of the two fibers of acrylic and viscose is realized, thereby realizing the production of a heat - generating blended yarn with more consistent functionality, so as to solve the above - mentioned problems existing in the prior art.

[0007] Technical Solution: A production method of a heat - generating blended yarn, comprising: The selected heat - generating acrylic fiber is made into a heat - generating acrylic carded sliver through the blow - carding unit; The selected viscose fiber is made into a viscose carded sliver through the blow - carding unit; The heat - generating acrylic carded sliver and the viscose carded sliver are jointly fed alternately under the control of a pair of mixing draw rollers in a single - pass mixing drawing process to obtain a continuous acrylic - viscose sliver in which the heat - generating acrylic carded sliver and the viscose carded sliver are arranged at intervals along the length direction; During mixing drawing, one heat - generating acrylic carded sliver and one viscose carded sliver are respectively pressed and fed between the left roller sleeve of each roller sleeve group and the left rubber roller sleeve of the corresponding rubber roller sleeve group, and between the right roller sleeve of the roller sleeve group and the right rubber roller sleeve of the corresponding rubber roller sleeve group. The alternate feeding of the heat - generating acrylic carded sliver and the viscose carded sliver is realized by switching the rotational and non - rotational states of the left roller sleeve and the right roller sleeve alternately; After alternate feeding, through the transition transportation of the first trumpet and the second trumpet of the rear input trumpet of the converging trumpet, and through the pressing of the front upper converging roller and the front lower converging roller in the front output trumpet, the heat - generating acrylic carded sliver and the viscose carded sliver fed alternately are broken, and a continuous acrylic - viscose sliver in which the heat - generating acrylic carded sliver and the viscose carded sliver are arranged at intervals along the length direction is obtained; A continuous acrylic - viscose sliver in which the heat - generating acrylic carded sliver and the viscose carded sliver are arranged at intervals along the length direction is obtained, realizing the mixing of acrylic and viscose along the longitudinal direction. And by controlling the interval time of the rotational states of the left roller sleeve and the right roller sleeve, the lengths of the heat - generating acrylic and viscose are controlled, and the mixing ratio of the two is controlled. Then, the 6 obtained acrylic - viscose slivers are drawn thinner by the drafting system of the mixing drawing process and then recombined to obtain an acrylic - viscose mixed sliver; Through recombination, the mixing of acrylic and viscose in the transverse direction along the axis of the acrylic - viscose mixed sliver is realized. The acrylic - viscose mixed sliver is further made into an acrylic - viscose ripe sliver through two passes of even drawing. In the recombination process of each pass of even drawing, a more refined and uniform mixing of acrylic and viscose in the transverse direction along the axis is realized. The acrylic - viscose ripe sliver is then successively made into the required heat - generating blended yarn through roving and spinning.

[0008] The heat - generating acrylic carded sliver output between the left roller sleeve and the left rubber roller sleeve of the corresponding rubber roller sleeve group enters the front output trumpet through the first trumpet of the rear input trumpet of the converging trumpet; The viscose carded sliver output between the right roller sleeve and the left rubber roller sleeve of the corresponding rubber roller sleeve group enters the front output trumpet through the second trumpet of the rear input trumpet of the converging trumpet; After the two are input alternately at intervals, they enter the front output bell mouth and are pressed between the front upper merging roller and the front lower merging roller to form a nitrile sticky strip, and the front upper merging roller and the front lower merging roller are driven by the conveying of the nitrile sticky strip to generate passive synchronous rotation, and when the feeding of the heated acrylic carded cotton strip or the viscose carded cotton strip stops, the heated acrylic carded cotton strip or the viscose carded cotton strip is broken with the nitrile sticky strip at the rear of the pressing point of the front upper merging roller and the front lower merging roller, thereby realizing continuous conveying of the formed nitrile sticky strip during the alternate feeding of the heated acrylic carded cotton strip and the viscose carded cotton strip.

[0009] A hybrid roller pair, the hybrid roller pair is arranged at the rear of a hybrid drawing frame drafting system, and the hybrid roller pair comprises: A mixing rubber roller includes a rubber roller shaft, and 6 optional rubber roller sets arranged on the rubber roller shaft, each of which includes a left rubber roller set and a right rubber roller set that are rotatably connected to the rubber roller shaft through a bearing; The mixing rubber roller includes a rubber roller shaft, on which are arranged 6 identical optional rubber roller sets, which are mounted on the pressure assembly, and each optional rubber roller set includes a left rubber roller cover and a right rubber roller cover, the left rubber roller cover is connected to the rubber roller shaft through a left bearing, and the right rubber roller cover is connected to the rubber roller shaft through a right bearing.

[0010] A mixed lower roller, comprising a roller shaft, and 6 select roller sets arranged on the roller shaft, each select roller set comprising a left roller sleeve rotatably connected to the roller shaft through a bearing, and a right roller sleeve fixedly connected to the roller shaft; The driving roller is connected to the left roller sleeve through a driving belt; Gather the bell mouth, design 6 groups, located in front of each selected roller set, each group includes: The rear input bell mouth comprises a first bell mouth and a second bell mouth which are arranged symmetrically in a horizontal axis; The first bell mouth is located on the left side, and the second bell mouth is located on the right side. The left side surface of the first bell mouth is a right-convex arc structure, the right side surface of the first bell mouth is a vertical rectangular structure, the right side surface of the second bell mouth is a left-convex arc structure, the left side surface of the second bell mouth is a vertical rectangular structure, and the right side surface of the first bell mouth completely overlaps with the left side surface of the second bell mouth.

[0011] A front output bell mouth, comprising a front upper output half mouth rotatably connected to the first bell mouth and a front lower output half mouth rotatably connected to the second bell mouth; The front upper output half-mouth is a hollow rectangular parallelepiped with open ends. The lower side of the front upper output half-mouth is open. The open rear end of the front upper output half-mouth is rotatably connected to the upper side of the front port of the first bell mouth through an upper elastic connecting shaft. A front upper merging roller is arranged in the front upper output half-mouth, and the front upper merging roller is connected to the inner side of the front upper output half-mouth through a bearing.

[0012] The front lower output semi-port is a hollow cuboid with both ends open. The upper side of the front lower output semi-port is open. The open rear end of the front lower output semi-port is rotatably connected to the lower side of the front port of the second trumpet through a lower elastic connecting shaft. A front lower converging roller is arranged inside the front lower output semi-port, and the front lower converging roller is connected to the inner side of the front lower output semi-port through a bearing.

[0013] The upper elastic connecting shaft and the lower elastic connecting shaft are exactly the same. The upper elastic connecting shaft and the lower elastic connecting shaft include two states: lifting and pressing down. After lifting the front upper output semi-port or the front lower output semi-port with a certain external force, the upper elastic connecting shaft or the lower elastic connecting shaft will be in the lifted state, and at this time, there is a separated state with a certain distance between the front upper output semi-port and the front lower output semi-port. After pressing down the front upper output semi-port and the front lower output semi-port with a certain external force, the upper elastic connecting shaft and the lower elastic connecting shaft will be in the pressed-down state, and at this time, the front upper output semi-port and the front lower output semi-port are in a closed state of being closely pressed against each other, thus forming a complete cuboid-shaped front output trumpet, and at this time, there is a certain tight pressing contact between the front upper converging roller and the front lower converging roller.

[0014] In a further embodiment, a front upper converging roller is arranged inside the front upper output semi-port, and a front lower converging roller is arranged inside the front lower output semi-port.

[0015] In a further embodiment, the drafting system of the drawing and doubling machine includes a rear drafting roller pair, a middle drafting roller pair, and a front drafting roller pair; The rear drafting roller pair includes a rear lower roller and a rear upper rubber roller; The middle drafting roller pair includes a middle lower roller and a middle upper rubber roller; The front drafting roller pair includes a front lower roller and a front upper rubber roller; The rear upper rubber roller, the middle upper rubber roller, and the front upper rubber roller are installed on the pressing component; The mixing roller pair is arranged at the rear of the rear drafting roller pair.

[0016] In a further embodiment, the driving roller and the input end of the roller shaft are respectively connected to the output ends of the first motor and the second motor, and only one of the first motor and the second motor rotates at any time.

[0017] The driving roller and the roller shaft are driven to rotate by the first motor and the second motor. The first motor and the second motor are communicatively connected to the programmable logic controller. The programmable logic controller controls the first motor and the second motor to switch between the rotating and non-rotating states at a certain interval time, and the states of the two are opposite at any time.

[0018] The programmable logic controller contacts the touch screen outside the circuit. The programmable logic controller controls the first motor and the second motor to alternately be in a state of maintaining rotation or stopping rotation. That is, when the first motor is in a state of maintaining rotation, the second motor is in a state of stopping, and when the second motor is in a state of maintaining rotation, the first motor is in a state of stopping. The interval time for the rotation state conversion of the first motor and the second motor is controlled by the programmable logic controller, and the interval time is input through the touch screen connected to the programmable logic controller.

[0019] In a further embodiment, when the first motor and the second motor are in a state of maintaining rotation, their rotational speeds are the same, and the rotational linear speed of the left roller sleeve or the right roller sleeve is kept consistent with the rotational linear speed of the rear lower roller.

[0020] In a further embodiment, a detection concave-convex roller pair is arranged at the rear of the mixing roller pair. The detection concave-convex roller pair includes the same number of detection upper convex rollers and detection lower concave rollers. The detection upper convex rollers are located above the detection lower concave rollers. Multiple groups of the detection lower concave rollers are designed and arranged on a detection roller shaft. Two adjacent detection lower concave rollers form a detection lower concave roller group that is vertically aligned with the selected roller sleeve group. The right detection lower concave roller in the detection lower concave roller group is fixedly connected to the detection roller shaft, and the left detection lower concave roller is rotatably connected to the detection roller shaft. The detection roller shaft is connected to the roller shaft of the mixing lower roller through synchronous transmission. Each left detection lower concave roller is respectively connected to the driving roller through a transmission belt.

[0021] Beneficial effects: The present invention discloses a production method of a heat-generating blended yarn and a mixing roller pair. By arranging a mixing roller pair including a mixing lower roller and a mixing upper rubber roller at the rear of the drafting system of a drawframe for mixing and drawing, the controllable selective feeding of acrylic carded sliver and viscose carded sliver is realized to obtain acrylic-viscose sliver, thereby realizing the longitudinal mixing of acrylic and viscose along the length direction of the acrylic-viscose sliver. Then, after being drawn and thinned by the drafting system and re-merged, an acrylic-viscose blended sliver is obtained, realizing the transverse mixing of acrylic and viscose along the axial direction of the acrylic-viscose blended sliver. Subsequently, the more uniform mixing of the two fibers of acrylic and viscose is realized, thus realizing the production of a heat-generating blended yarn with more consistent functionality. Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of the mixing roller pair of the present invention.

[0023] Figure 2 It is a schematic diagram of raw material selection and matching of the present invention.

[0024] Figure 3 Schematic diagram of the process flow of the present invention.

[0025] Figure 4 Schematic diagram of the design of the key opening and cleaning process parameters of the present invention.

[0026] Figure 5 Schematic diagram of the design of the key carding process parameters of the present invention.

[0027] Figure 6 Schematic diagram of the process configuration during mixing drawframe and even drawframe of the present invention.

[0028] Figure 7 Schematic diagram of the roving process configuration of the present invention.

[0029] Figure 8 Schematic diagram of the spinning process configuration of the present invention.

[0030] Figure 9 Schematic diagram of the comparison of the yarn quality test of the present invention.

[0031] Figure 10 Schematic diagram of the comparison of the twist factor of the present invention.

[0032] Figure 11 Schematic diagram of the comparison of the evenness of the sliver of the present invention.

[0033] Figure 12 Schematic diagram of the comparison of the hairiness of the present invention.

[0034] Figure 13 Schematic diagram of the comparison of the single yarn breaking strength of the present invention.

[0035] Reference numerals are: 1. Mixing and coating top roller; 2. Top roller shaft; 3. Selective top roller sleeve group; 4. Left top roller sleeve; 5. Right top roller sleeve; 6. Mixing and coating bottom roller; 7. Bottom roller shaft; 8. Selective bottom roller sleeve group; 9. Left bottom roller sleeve; 10. Right bottom roller sleeve; 11. Driving roller; 12. Driving belt; 13. Gathering bell mouth; 14. Rear input bell mouth; 15. First bell mouth; 16. Second bell mouth; 17. Front upper output half mouth; 18. Front lower output half mouth; 19. Front upper converging roller; 20. Front lower converging roller; 21. Upper elastic connecting shaft; 22. Lower elastic connecting shaft. Detailed implementation manners

[0036] The present application relates to a production method of a heat-generating blended yarn and a matching mixing roller pair, which will be explained in detail below through specific implementation manners.

[0037] A production method of a heat-generating blended yarn includes: Obtaining a heat-generating acrylic carded sliver from the selected heat-generating acrylic fibers through blow-carding unit; The selected viscose fiber is made into viscose carded sliver through blow-carding unit; The heat-generating acrylic carded sliver and the viscose carded sliver are jointly drawn through a single pass of drawing and doubling. One heat-generating acrylic carded sliver and one viscose carded sliver are respectively pressed and fed between the left roller sleeve 9 of each roller sleeve group and the left rubber roller sleeve 4 of the corresponding rubber roller sleeve group, and between the right roller sleeve 10 of the roller sleeve group and the right rubber roller sleeve 5 of the corresponding rubber roller sleeve group. The alternating feeding of the heat-generating acrylic carded sliver and the viscose carded sliver is realized by switching the alternating rotation and non-rotation states of the left roller sleeve 9 and the right roller sleeve 10.

[0038] After the feeding, the first trumpet 15 and the second trumpet 16 of the input trumpet 14 are used for the transitional transportation of the output heat-generating acrylic carded sliver and viscose carded sliver, and the pressing of the front upper converging roller 19 and the front lower converging roller 20 in the front output trumpet is used for breaking the alternately fed heat-generating acrylic carded sliver and viscose carded sliver, so as to obtain a continuous acrylic-viscose sliver in which the heat-generating acrylic carded sliver and the viscose carded sliver are arranged at intervals along the length direction; A continuous acrylic-viscose sliver in which the heat-generating acrylic carded sliver and the viscose carded sliver are arranged at intervals along the length direction is obtained, realizing the mixing of acrylic and viscose along the longitudinal direction, and the control of the lengths of the heat-generating acrylic and viscose is realized by controlling the interval time of the rotation states of the left roller sleeve 9 and the right roller sleeve 10, realizing the control of the blending ratio of the two. Then, the obtained 6 acrylic-viscose slivers are drawn and thinned by the drafting system of the drawing and doubling process and then re-combined to obtain an acrylic-viscose blended sliver; The mixing of acrylic and viscose along the transverse direction of the axis of the acrylic-viscose blended sliver is realized through combination. The acrylic-viscose blended sliver is further made into an acrylic-viscose finished sliver through two passes of even drawing and doubling. In the combination process of each pass of even drawing and doubling, a more refined and uniform mixing of acrylic and viscose along the transverse direction of the axis is realized. The acrylic-viscose finished sliver is then successively processed through roving and spinning to obtain the required heat-generating blended yarn.

[0039] Specifically, it includes the following steps: The first step: Raw material selection: For acrylic fiber, heat-generating acrylic fiber with a moisture regain of 2.57%, breaking strength of 8.14 cN, breaking tenacity of 4.79 cN / dtex, elongation at break of 37.56%, initial modulus of 0.33 cN / dtex, integral heat of moisture absorption of 126.46 J / g, and differential heat of moisture absorption of 4.5 kJ / g is selected; for viscose fiber, Lenzing viscose fiber is selected, and in order to save raw materials, 7.82% of the Lenzing viscose waste containing 2.5% cotton is mixed; The second step: Blow-carding unit: For heat-generating acrylic, since the heat-generating acrylic fiber is prone to agglomeration and polymerization before opening and cleaning, if the heat-generating acrylic fiber is not thoroughly opened and cleaned in the opening and cleaning stage of cotton, the cotton lap is prone to lumps, resulting in uneven yarn evenness of the spun yarn, affecting the use of the subsequent processes and the quality of the yarn; The selected heat - generating acrylic fibers are successively grabbed by a reciprocating bale opener according to the required mixing ratio. During the mechanical action process between the bale - opening beater and the heat - generating acrylic fibers during the grabbing process, preliminary loosening of the acrylic fibers is achieved. The grabbing of the selected heat - generating acrylic fibers is realized by the reciprocating movement of the bale - opening beater along the bale opener, and then the preliminary mixing of the acrylic fibers is achieved. The grabbed heat - generating acrylic fibers are driven by a cotton - conveying fan and then pass through a bridge - type magnet to adsorb and separate metal impurities in the fibers, and through a spark - metal detector to separate and remove sparks in the fibers. Then, after being driven by the cotton - conveying fan again, they enter a multi - bin mixing machine. Through the cotton - conveying pipeline, the input heat - generating acrylic fibers randomly fall into different cotton bins to achieve the first random mixing of the selected acrylic fibers. The acrylic fibers in each cotton bin are then transported through different paths and re - converge to achieve the second random mixing of the selected acrylic fibers. During the transportation process, the loosening and impurity removal of the acrylic fibers are achieved through the beating action of the beater at the bottom of the cotton bin, the grabbing of the acrylic layer by the angle - pin curtain, the beating of the surplus acrylic blocks by the even - cotton roller, and the stripping action of the stripping roller. The mixed heat - generating acrylic fibers pass through an arc - shaped magnet and are then transported by a cotton - conveying fan into a vertical fiber separator. When the acrylic fiber stream passes through the volute of the fiber separator, it rotates. Under the action of centrifugal force, the dust and short fibers in the fibers are sucked into the dust - discharging pipeline through the mesh holes of the straight - line mesh cylinder to achieve dust separation. At the same time, when the acrylic fiber stream falls, after rotation and diffusion, the fibers have a better mixing effect. Then, it is transported by a cotton - conveying fan into a fine bale opener. In the fine bale opener, the acrylic is beaten by the beater to achieve a fine loosening and impurity - removal effect. The loosened and mixed heat - generating acrylic fibers enter a feeding box through a spark detector by a cotton - conveying fan. In the feeding box, an even layer is formed to obtain a heat - generating acrylic fiber layer. Subsequently, the even heat - generating acrylic fiber layer is directly fed into a carding machine. In the carding machine, fine loosening, carding, impurity removal, and sliver formation are carried out to produce a strip - structured heat - generating acrylic carded sliver; For viscose, the selected viscose fibers are sequentially grabbed by a reciprocating bale opener according to the required mixing ratio, and the viscose is preliminarily loosened during the mechanical action process between the bale opening beater and the viscose fibers during the grabbing process. The grabbing of various selected viscose fibers is achieved through the reciprocating movement of the bale opening beater along the bale opener, and then the preliminary mixing of the viscose fibers is realized. The grabbed viscose fibers are driven by a cotton conveying fan and then enter the multi-bin mixing machine after the metal impurities in the fibers are adsorbed and separated by a bridge magnet and the sparks in the fibers are separated and removed by a spark metal detector. The input viscose fibers are randomly dropped into different cotton bins through a cotton conveying pipeline to achieve the first random mixing of the selected viscose fibers. The viscose fibers in each cotton bin are then re-converged after being conveyed through different paths to achieve the second random mixing of the selected viscose fibers. During the conveying process, the viscose fibers are loosened and cleaned through the beating action of the beater at the bottom of the cotton bin, the grabbing of the angle bar curtain on the viscose fiber layer, the beating of the even cotton roller on the excess viscose blocks, and the stripping action of the stripping roller. The mixed viscose fibers enter the vertical fiber separator after passing through an arc magnet and are conveyed by a cotton conveying fan. When the viscose fiber flow passes through the volute of the fiber separator, it rotates. Under the action of centrifugal force, the dust and short fibers in the fibers are sucked into the dust removal pipeline through the mesh holes of the straight web cylinder to achieve dust separation. At the same time, the viscose fiber flow has a better mixing effect after rotating and spreading during the falling process. Then it is conveyed by a cotton conveying fan into the fine bale opener. In the fine bale opener, the viscose is beaten by the beater to achieve a fine loosening and cleaning effect. The loosened and mixed viscose fibers enter the feeding box after passing through the spark detector by a cotton conveying fan. In the feeding box, a uniform layer is laid to obtain a viscose fiber layer. Subsequently, the uniform viscose fiber layer is directly fed into the carding machine. In the carding machine, it is finely loosened, carded, cleaned, and formed into strips to obtain a strip-shaped viscose carded sliver; Step 3: Mixing drawframe: The heat - generating acrylic carded sliver and the viscose carded sliver obtained in the second step are jointly processed through one - pass mixing drawframe to obtain an acrylic - viscose mixed sliver. A mixing drawframe is used. During use, 6 heat - generating acrylic carded slivers and 6 viscose carded slivers are jointly fed into the mixing drawframe. One heat - generating acrylic carded sliver is fed in by pressing between the left roller sleeve 9 of a roller sleeve group and the left roller cover 4 of the corresponding roller cover group, and one viscose carded sliver is fed in by pressing between the right roller sleeve 10 of this roller sleeve group and the right roller cover 5 of the roller cover group. The interval time is input and determined through a touch screen connected to a programmable logic controller, and the interval times set by the 6 selected roller sleeve groups 8 are kept exactly the same. At the beginning, each selected roller sleeve group 8 randomly selects either the left roller sleeve 9 or the right roller sleeve 10 to rotate first, and then realizes the preferred feeding of the heat - generating acrylic carded sliver or the viscose carded sliver. Thus, the alternate feeding of the heat - generating acrylic carded sliver and the viscose carded sliver is realized through the intermittent alternate rotation of the left roller sleeve 9 and the right roller sleeve 10. And the rotational speed of the lower mixing roller pair's lower mixing roller 6 is set to be the same as the rotational speed of the lower rear roller of the rear draft roller pair's roller shaft 7. Thus, an acrylic - viscose sliver with the heat - generating acrylic carded sliver and the viscose carded sliver arranged at intervals along the length direction is obtained through the alternate state switching of the left roller sleeve 9 and the right roller sleeve 10, thereby realizing the mixing of the heat - generating acrylic and the viscose along the longitudinal direction. And the control of the lengths of the heat - generating acrylic and the viscose is realized through the setting of the interval time of the state switching of the left roller sleeve 9 and the right roller sleeve 10, and then the control of the blending ratio of the heat - generating acrylic and the viscose is realized. The output heat - generating acrylic carded sliver enters the front output trumpet through the first trumpet 15 of the rear input trumpet 14 of the gathering trumpet 13, and the output viscose carded sliver enters the front output trumpet through the second trumpet 16 of the rear input trumpet 14 of the gathering trumpet 13. After the two are alternately input at intervals and enter between the front upper converging roller 19 and the front lower converging roller 20 of the front output trumpet and are pressed to form an acrylic - viscose sliver. And under the driving of the conveyance of the acrylic - viscose sliver, the front upper converging roller 19 and the front lower converging roller 20 generate passive synchronous rotation. And when the feeding of the heat - generating acrylic carded sliver or the viscose carded sliver stops, it will cause the heat - generating acrylic carded sliver or the viscose carded sliver to break from the acrylic - viscose sliver at the rear of the pressing point between the front upper converging roller 19 and the front lower converging roller 20. Thus, the continuous conveyance of the formed acrylic - viscose sliver is realized during the alternate feeding of the heat - generating acrylic carded sliver and the viscose carded sliver at intervals. Then the 6 obtained acrylic - viscose slivers are drawn and thinned by the drafting system of the drawframe of the mixing drawframe and then re - combined to obtain an acrylic - viscose mixed sliver, thereby realizing the mixing of the acrylic and the viscose in the transverse direction along the axis of the acrylic - viscose mixed sliver through recombination; Step 4: Even drafting: The acrylic-viscose blended sliver obtained in Step 3 is drafted evenly in two passes to obtain an acrylic-viscose finished sliver. The process design principle of "multiple doubling, heavy pressure, strong control, smooth channels, and appropriate increase in draft force" is adopted in even drafting. In the first pass of even drafting, 8 acrylic-viscose blended slivers are fed in together. When the 8 acrylic-viscose blended slivers are arranged side by side horizontally, the acrylic and viscose segments in each acrylic-viscose blended sliver are randomly arranged side by side horizontally with those in the adjacent acrylic-viscose blended sliver, thus realizing the random combination and mixing of acrylic and viscose in the horizontal direction again. The 8 acrylic-viscose blended slivers are jointly drafted and thinned by the drafting system of the drawframe in the first pass of even drafting and then redoubled to obtain an acrylic-viscose semi-finished sliver. During the doubling process, a more refined uniform mixing of acrylic and viscose is achieved in the horizontal direction along the axis of the acrylic-viscose semi-finished sliver. At the same time, the parallel straightness of the fibers is improved during the drafting and thinning process. In the second pass of even drafting, 8 acrylic-viscose semi-finished slivers are fed in together. When the 8 acrylic-viscose semi-finished slivers are arranged side by side horizontally, the acrylic and viscose segments in each acrylic-viscose semi-finished sliver are randomly arranged side by side horizontally with those in the adjacent acrylic-viscose semi-finished sliver, thus realizing the random combination and mixing of acrylic and viscose in the horizontal direction again. The 8 acrylic-viscose semi-finished slivers are jointly drafted and thinned by the drafting system of the drawframe in the second pass of even drafting and then redoubled to obtain an acrylic-viscose finished sliver. During the doubling process, a more refined uniform mixing of acrylic and viscose is achieved in the horizontal direction along the axis of the acrylic-viscose finished sliver. At the same time, the parallel straightness of the fibers is improved during the drafting and thinning process; Step 5: Roving: The acrylic-viscose finished sliver obtained in Step 4 is drafted and thinned by the drafting system of the roving frame and twisted and wound by the twisting and winding system of the roving frame to obtain an acrylic-viscose roving with a certain strength. The process principle of "light weight per unit length, slow speed, heavy pressure, and low twist" is followed in the roving. To prevent slippage during drafting, a small back zone draft multiple and a large back zone gauge are adopted to achieve the control of fiber strength. Since acrylic fibers and viscose fibers are relatively soft and fluffy, the roller pressure is appropriately increased within a certain range to make it compatible with the grasping force and improve the yarn forming level. Since compact siro spinning is used in the subsequent spinning process, the roving twist is designed to be slightly larger. Since the amount of fibers in the drafting system of the roving frame is large, the friction between the fibers has a "self-control" effect on the fibers, so the gauge of the main drafting zone of the roving frame drafting mechanism is designed to be slightly larger. Since a simple roller drafting is used in the back zone, the process method of heavy pressure and large gauge is adopted. The holding distance in the front zone finishing area is equal to or slightly larger than the fiber quality length. The drafting system uses four rollers and two short aprons. Among them, the holding distance in the finishing area is slightly larger than the fiber quality length. Since the fiber quality length is 37 mm, the holding distance in the finishing area should be selected as 38 mm, and the roller gauge is 28 mm, that is, the front roller gauge is designed as 10 mm; The holding distance in the main drafting zone is equal to the apron frame length + (24 - 28), so the roller gauge in the main drafting zone is set as 25 mm; Step 6: Spinning: The nitrile-viscose roving obtained in the fifth step is stretched and thinned by the drafting system of the spinning machine and twisted and wound by the twisting system to obtain a heat-generating blended yarn with a certain strength. A ring spinning machine is selected. The fed roving will become compact after being drafted in the rear drafting zone, thereby preparing for the drafting in the front drafting zone. The rear drafting zone adopts curve drafting, and the drafting multiple should be controlled to be relatively small, so as to provide the front drafting zone with uniform structure. Since the rear drafting zone adopts curve drafting, the roller has a stronger control over the fiber, and the roller spacing in the rear drafting zone is set to be relatively small. The front drafting zone adopts a small roller spacing to strengthen the effective control of the floating fiber and reduce the unevenness of the spun yarn; a three-roller long and short rubber V-type drafting pneumatic cradle is used for pressurization. Combined with the fiber performance and the main length of the fiber, the roller spacing in the front drafting zone is set to 18 mm, and the roller spacing in the rear drafting zone is set to 38 mm.

[0040] The hybrid drawing frame belongs to the prior art, and comprises a drafting system and a pressurizing assembly, wherein the drafting system comprises a rear drafting roller pair, a middle drafting roller pair, and a front drafting roller pair, wherein the rear drafting roller pair comprises a rear lower roller and a rear upper rubber roller, wherein the middle drafting roller pair comprises a middle lower roller and a middle upper rubber roller, wherein the front drafting roller pair comprises a front lower roller and a front upper rubber roller, wherein the rear upper rubber roller, the middle upper rubber roller, and the front upper rubber roller are mounted on the pressurizing assembly, and a mixed roller pair is arranged at the rear of the rear drafting roller pair; A mixing roller pair, comprising a mixing lower roller 6 and a mixing upper rubber roller 1; The mixing lower roller 6 includes a roller shaft 7, which is a solid cylindrical structure. Six identical selection roller sets 8 are arranged on the roller shaft 7. Each selection roller set 8 includes a left roller sleeve 9 and a right roller sleeve 10. The left roller sleeve 9 and the right roller sleeve 10 are hollow and open at both ends. The left roller sleeve 9 is connected to the roller shaft 7 through a bearing, and the right roller sleeve 10 is fixedly connected to the roller shaft 7. A driving roller 11 is arranged below the mixing lower roller 6, and the left roller set 9 of each selection roller set 8 is respectively connected to the driving roller 11 through a driving belt 12; The driving roller 11 is driven to rotate by the first motor, and the roller shaft 7 is driven to rotate by the second motor. The first motor and the second motor are electrically connected to the programmable logic controller, and the programmable logic controller is electrically connected to the touch screen. The programmable logic controller controls the first motor and the second motor to alternately maintain rotation or stop rotating. That is, when the first motor is rotating in the holding state, the second motor is in the stopped state, and when the second motor is rotating in the holding state, the first motor is in the stopped state. Moreover, when the first motor and the second motor are rotating in the holding state, their rotational speeds are the same, and the rotational linear velocity of the left roller sleeve 9 or the right roller sleeve 10 is made to be consistent with the rotational linear velocity of the rear lower roller. Also, the interval time for the state conversion of the first motor and the second motor is controlled by the programmable logic controller, and the interval time is input through the touch screen connected to the programmable logic controller. A converging bell mouth 13 is provided directly in front of each selected roller sleeve group 8. The converging bell mouth 13 includes a rear input bell mouth 14 and a front output bell mouth. The rear input bell mouth 14 includes a first bell mouth 15 and a second bell mouth 16. The first bell mouth 15 and the second bell mouth 16 are arranged in a left-right horizontal axisymmetric layout. The first bell mouth 15 is on the left side, and the second bell mouth 16 is on the right side. The left side surface of the first bell mouth 15 is a right-convex arc structure, the right side surface of the first bell mouth 15 is a vertical rectangular structure, the right side surface of the second bell mouth 16 is a left-convex arc structure, the left side surface of the second bell mouth 16 is a vertical rectangular structure, and the right side surface of the first bell mouth 15 completely coincides with the left side surface of the second bell mouth 16. The front port of the first bell mouth 15 is rectangular. The front output bell mouth includes a front upper output half mouth 17 and a front lower output half mouth 18. The front upper output half mouth 17 is a hollow cuboid with both ends open, the lower side surface of the front upper output half mouth 17 is open, and the open rear end of the front upper output half mouth 17 is rotatably connected to the upper side edge of the front port of the first bell mouth 15 through an upper elastic connecting shaft 21. A front upper converging roller 19 is arranged inside the front upper output half mouth 17, and the front upper converging roller 19 is connected to the inner side surface of the front upper output half mouth 17 through a bearing. The front lower output half mouth 18 is a hollow cuboid with both ends open, the upper side surface of the front lower output half mouth 18 is open, and the open rear end of the front lower output half mouth 18 is rotatably connected to the lower side edge of the front port of the second bell mouth 16 through a lower elastic connecting shaft 22. A front lower converging roller 20 is arranged inside the front lower output half mouth 18, and the front lower converging roller 20 is connected to the inner side surface of the front lower output half mouth 18 through a bearing. The upper elastic connecting shaft 21 and the lower elastic connecting shaft 22 are exactly the same. The upper elastic connecting shaft 21 and the lower elastic connecting shaft 22 include two states: upper lifting and lower pressing. After lifting the front upper output half-port 17 or the front lower output half-port 18 with a certain external force, the upper elastic connecting shaft 21 or the lower elastic connecting shaft 22 will be in the upper lifting state. At this time, there is a separated state with a certain distance between the front upper output half-port 17 and the front lower output half-port 18. After pressing the front upper output half-port 17 and the front lower output half-port 18 with a certain external force, the upper elastic connecting shaft 21 and the lower elastic connecting shaft 22 will be in the lower pressing state. At this time, the front upper output half-port 17 and the front lower output half-port 18 are in a closed state of being closely pressed against each other, thus forming a complete cuboid-shaped front output bell mouth. At this time, there is a certain tight pressing contact between the front upper converging roller 19 and the front lower converging roller 20; The mixing and gluing roller 1 includes a roller shaft 2. Six completely identical selected roller sleeve groups 3 are arranged on the roller shaft 2. The selected roller sleeve groups 3 are installed on the pressing assembly. Each selected roller sleeve group includes a left roller sleeve 4 and a right roller sleeve 5. The left roller sleeve 4 is connected to the roller shaft 2 through a left bearing, so that the left roller sleeve 4 can rotate freely around the roller shaft 2. The right roller sleeve 5 is connected to the roller shaft 2 through a right bearing, so that the right roller sleeve 5 can rotate freely around the roller shaft 2.

[0041] A detection concave-convex roller pair is arranged at the rear of the mixing roller pair. The detection roller pair includes the same number of detection upper convex rollers and detection lower concave rollers, and the number is the same as the number of the fed heat-generating acrylic carded sliver and viscose carded sliver; Each detection lower concave roller is arranged on a detection roller shaft, and two adjacent detection lower concave rollers form a detection lower concave roller group; The number of the detection lower concave roller groups is the same as the number of the selected roller sleeve groups and they are vertically aligned. The right detection lower concave roller in a detection lower concave roller group is fixedly connected to the detection roller shaft, and the left detection lower concave roller is rotatably connected to the detection roller shaft; The detection roller shaft is connected to the roller shaft 7 of the mixing lower roller through a synchronous transmission. Each left detection lower concave roller is respectively connected to the driving roller 11 through a transmission belt. The detection upper convex roller is of a movable type, and its position is offset according to the cross-sectional area change of the quality of the sliver entering the detection concave-convex roller. The moving distance of each detection upper convex roller is converted into a voltage value through a signal converter and transmitted to the programmable logic control system; The upper convex detection roller and the lower concave detection roller are in an up-and-down structure and are adapted to each other. The upper convex detection roller is pressed down by an elastic component. After being pressed down, the upper convex detection roller and the lower concave detection roller press against each other in contact. And a displacement sensor is arranged under the upper convex detection roller. When the thickness of the fed sliver changes, it will cause a change in the displacement of the elastically pressed upper convex detection roller, and a signal is sent by the displacement sensor under the roller. The change in the thickness of the sliver is characterized by the displacement change. This structure between the two is already existing. However, in this application, two lower concave detection rollers are arranged on a detection roller shaft, and the two are respectively synchronously driven with the left and right roller sleeves 10 of the mixing roller pair; During use, the heat-generating acrylic carded sliver first passes through by being pressed between the lower concave detection roller on the left side of each lower concave detection roller group and the corresponding upper convex detection roller, and then is fed in by being pressed between the left roller sleeve 9 of each selection roller sleeve group 8 and the left rubber roller sleeve 4 of the corresponding selection rubber roller sleeve group 3. During this period, the moving distance of each upper convex detection roller is transmitted to the programmable logic controller, and the average value is calculated. By comparing the average voltage value converted from the fed heat-generating acrylic carded sliver with the target value, and the proportion of the heat-generating acrylic fibers required in the mixing, the output speed of the first motor is obtained; The viscose carded sliver first passes through by being pressed between the lower concave detection roller on the right side of each lower concave detection roller group and the corresponding upper convex detection roller, and then is fed in by being pressed between the right roller sleeve 10 of each selection roller sleeve group 8 and the left rubber roller sleeve 4 of the corresponding selection rubber roller sleeve group 3. During this period, the moving distance of each upper convex detection roller is transmitted to the programmable logic controller, and the average value is calculated. By comparing the average voltage value converted from the fed viscose carded sliver with the target value, and the proportion of the viscose fibers required in the mixing, the output speed of the second motor is obtained, realizing the precise mixing ratio control of the two fibers.

[0042] In another embodiment, taking the preparation of a heat-generating blended yarn with a linear density of 40S and a blending ratio of A35 / R65 as an example, a drawing frame with a mixing roller pair added according to this patent and a traditional drawing frame are respectively used for the mixing of heat-generating acrylic fibers and viscose fibers. The corresponding process parameters are as shown in the appendix Figure 2-13 as follows; as shown in the appendix Figure 2-5 respectively, the schematic diagrams of raw material selection, process flow, key blowroom process parameter design, and key carding process parameter design; When performing mixing drawframe and even drawframe, when using a traditional drawframe for mixing, the JWF1310 drawframe is adopted, and 3 heat-set acrylic card slivers and 5 viscose card slivers are fed together; when using the mixing drawframe with the mixing roller pair added in this patent, a mixing roller pair is added to the rear of the drafting system of the JWF1310 drawframe, and 6 heat-set acrylic card slivers and 6 viscose card slivers are fed together, and the ratio of the interval time for switching the states of the left roller sleeve and the right roller sleeve is set to 7:13, that is, the ratio of the time for the left roller sleeve to feed the heat-set acrylic card sliver to the time for the right roller sleeve to feed the viscose card sliver each time is 7:13. The specific process configuration is as shown in Figure 6-8 shown; As shown in Figure 9 shown, the theoretical gram weight is 1.47 g / 100 m. When using traditional drawframe mixing, the average actual gram weight is 1.4459 g / 100 m, and the weight deviation is -1.64%. When using the mixing drawframe of this patent for mixing, the average actual gram weight is 1.4575 g / 100 m, and the weight deviation is -0.85%. The weight deviations of both are within ±2.5%, meeting the product requirements; at the same time, when using the mixing drawframe of this patent for mixing, due to the more uniform mixing of the heat-set acrylic fibers and viscose fibers, the utilization rate of the fibers is increased, resulting in an increase in the actual gram weight, and then the weight deviation is reduced.

[0043] As shown in Figure 10 shown, the calculated twist is 85.99. When using traditional drawframe mixing, the average actual twist is 85.78, and the error value is 0.25%. When using the mixing drawframe of this patent for mixing, the average actual twist is 85.52, and the error value is 0.54%. Both meet the product requirements.

[0044] As shown in Figure 11 shown, when using the mixing drawframe of this patent for mixing, due to the more uniform mixing of the heat-set acrylic fibers and viscose fibers, the two types of fibers are more evenly twisted, resulting in an improvement in the evenness of the spun yarn. At the same time, due to the more uniform mixing of the two types of fibers, the yarn defects are reduced.

[0045] As shown in Figure 12 shown, when using the mixing drawframe of this patent for mixing, due to the more uniform mixing of the heat-set acrylic fibers and viscose fibers, the two types of fibers are more evenly twisted, so that the fibers are more effectively drawn into the yarn body, and then the hairiness of the blended yarn is reduced, especially the long hairiness of 3 mm and above.

[0046] As shown in Figure 13As shown, when using the drawing frame of this patent for mixing, since more uniform mixing of the heat-generating acrylic fiber and viscose fiber is achieved, the twisting of the two fibers is more uniform, and at the same time, the utilization rate of the fibers is higher, thus resulting in an increase in strength.

[0047] Principle of operation description: The heat-generating acrylic carded sliver obtained by the blow-carding unit from the selected heat-generating acrylic fiber; The viscose carded sliver obtained by the blow-carding unit from the selected viscose fiber; The heat-generating acrylic carded sliver and the viscose carded sliver are jointly fed through one pass of drawing frame. One heat-generating acrylic carded sliver and one viscose carded sliver are respectively pressed and fed between the left roller sleeve 9 of each roller sleeve group and the left rubber roller sleeve 4 of the corresponding rubber roller sleeve group, and between the right roller sleeve 10 of the roller sleeve group and the right rubber roller sleeve 5 of the corresponding rubber roller sleeve group. The alternating feeding of the heat-generating acrylic carded sliver and the viscose carded sliver is achieved by the alternating rotation and non-rotation state switching of the left roller sleeve 9 and the right roller sleeve 10.

[0048] After the feeding, through the transition conveying of the first trumpet 15 and the second trumpet 16 of the input trumpet 14 for the output heat-generating acrylic carded sliver and viscose carded sliver, and through the pressing of the front upper converging roller 19 and the front lower converging roller 20 in the front output trumpet, the heat-generating acrylic carded sliver and the viscose carded sliver fed alternately are broken, and a continuous acrylic-viscose sliver with the heat-generating acrylic carded sliver and the viscose carded sliver arranged at intervals along the length direction is obtained; A continuous acrylic-viscose sliver with the heat-generating acrylic carded sliver and the viscose carded sliver arranged at intervals along the length direction is obtained, realizing the mixing of acrylic and viscose along the longitudinal direction. And by controlling the interval time of the rotation state of the left roller sleeve 9 and the right roller sleeve 10, the lengths of the heat-generating acrylic and viscose are controlled, and the blending ratio of the two is controlled. Then, the 6 obtained acrylic-viscose slivers are drawn thinner by the drafting system of the drawing frame and then recombined to obtain an acrylic-viscose blended sliver; Through recombination, the mixing of acrylic and viscose along the transverse direction of the axis of the acrylic-viscose blended sliver is achieved. The acrylic-viscose blended sliver is then processed through two passes of even drawing to obtain an acrylic-viscose finished sliver. In the recombination process of each pass of even drawing, a more refined and uniform mixing of acrylic and viscose along the transverse direction of the axis is achieved. The acrylic-viscose finished sliver is then processed through roving and spinning in sequence to obtain the required heat-generating blended yarn.

[0049] The preferred specific embodiments of the present invention have been described in detail above in conjunction with the drawings. However, the present invention is not limited to the specific details in the above specific embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A production method of a heat - generating blended yarn, characterized in that, Including: Preparing the selected heat-generating acrylic fiber into a heat-generating acrylic card sliver through the blow-carding unit; Preparing the selected viscose fiber into a viscose card sliver through the blow-carding unit; Controlling and alternately feeding the heat-generating acrylic card sliver and the viscose card sliver together through a pair of mixing and drawing rollers in a single mixing and drawing process to obtain a continuous acrylic-viscose sliver in which the heat-generating acrylic card sliver and the viscose card sliver are arranged at intervals along the length direction, realizing the precise mixing of acrylic and viscose along the longitudinal direction. The obtained acrylic-viscose sliver is then drawn and thinned by the drafting system of the mixing and drawing process and re-combined to prepare an acrylic-viscose mixed sliver; Realizing the mixing of acrylic and viscose in the transverse direction along the axis of the acrylic-viscose mixed sliver through combination. The acrylic-viscose mixed sliver is then processed through two uniform drawing processes to prepare an acrylic-viscose finished sliver. In the combination process of each uniform drawing process, the uniform mixing of acrylic and viscose in the transverse direction along the axis is realized. The acrylic-viscose finished sliver is then successively processed through roving and spinning to obtain a heat-generating blended yarn.

2. The production method of a heat-generating blended yarn according to claim 1, characterized in that: During mixing and drawing, the heat-generating acrylic card sliver and the viscose card sliver are respectively pressed and fed between the left roller sleeve of each roller sleeve group and the left rubber roller sleeve of the corresponding rubber roller sleeve group, and between the right roller sleeve of the roller sleeve group and the right rubber roller sleeve of the corresponding rubber roller sleeve group. The alternate feeding of the heat-generating acrylic card sliver and the viscose card sliver is realized by switching the alternate working states of the left roller sleeve and the right roller sleeve.

3. The production method of a heat-generating blended yarn according to claim 2, characterized in that: After alternate feeding, the heat-generating acrylic card sliver and the viscose card sliver output are transitively conveyed through the first trumpet and the second trumpet of the rear input trumpet. The heat-generating acrylic card sliver and the viscose card sliver fed alternately are broken by the pressing of the front upper converging roller and the front lower converging roller in the front output trumpet, and an acrylic-viscose sliver in which the heat-generating acrylic card sliver and the viscose card sliver are arranged at intervals along the length direction and is continuous is prepared.

4. A mixed pair of rollers is used to implement the production method of the heat-generating blended yarn according to any one of claims 1-3, and is characterized in that, The pair of mixing rollers is arranged at the rear of the drafting system of the mixing and drawing machine, and the pair of mixing rollers includes: A mixing upper rubber roller, including a rubber roller shaft, and a plurality of selected rubber roller sleeve groups arranged on the rubber roller shaft. Each selected rubber roller sleeve group includes a left rubber roller sleeve rotatably connected to the rubber roller shaft and a right rubber roller sleeve; A mixing lower roller, including a roller shaft, and a plurality of selected roller sleeve groups arranged on the roller shaft. Each selected roller sleeve group includes a left roller sleeve rotatably connected to the roller shaft and a right roller sleeve fixedly connected to the roller shaft; A driving roller, which is drivingly connected to the left roller sleeve through a driving belt; A converging trumpet, with multiple groups designed, respectively located directly in front of each selected roller sleeve group. Each group includes: A rear input trumpet, including a first trumpet and a second trumpet arranged in a horizontally left-right axisymmetric layout; A front output trumpet, including a front upper output half port rotatably connected to the first trumpet and a front lower output half port connected to the second trumpet.

5. A compound roller pair according to claim 4, characterized in that: A front upper converging roller is arranged in the front upper output half port, and a front lower converging roller is arranged in the front lower output half port.

6. A compound roller pair according to claim 4, characterized in that: The drafting system of the mixing and drawing machine includes a rear drafting roller pair, a middle drafting roller pair, and a front drafting roller pair; The rear drafting roller pair includes a rear lower roller and a rear upper rubber roller; The middle drafting roller pair includes a middle lower roller and a middle upper rubber roller; The front drafting roller pair includes a front lower roller and a front upper rubber roller; The pair of mixing rollers is arranged at the rear of the rear drafting roller pair.

7. A compound roller pair according to claim 4, characterized in that: The driving roller and the input end of the roller shaft are respectively connected to the output ends of the first motor and the second motor, and only one of the first motor and the second motor rotates at any time.

8. A compound roller pair according to claim 4, characterized in that: When the first motor and the second motor are in a rotating state, their rotational speeds are the same, so that the rotational linear speed of the left roller sleeve or the right roller sleeve is the same as that of the rear lower roller.

9. A compound roller pair according to claim 4, characterized in that: A detection concave-convex roller pair is arranged at the rear of the mixing roller pair. The detection concave-convex roller pair includes the same number of detection upper convex rollers and detection lower concave rollers; The detection upper convex rollers are located above the detection lower concave rollers; Multiple groups of the detection lower concave rollers are designed and arranged on a detection roller shaft. Two adjacent detection lower concave rollers form a detection lower concave roller group that is vertically aligned with the selection roller sleeve group; The right detection lower concave roller in the detection lower concave roller group is fixedly connected to the detection roller shaft, and the left detection lower concave roller is rotatably connected to the detection roller shaft; The detection roller shaft is connected to the roller shaft of the mixing lower roller through synchronous transmission, and each left detection lower concave roller is respectively connected to the driving roller through a transmission belt.

Images