Cotton yarn dyeing and drying process

Abstract

The invention discloses a dyeing and drying process of cotton yarns, which can realize that a universal driving limiting barrel is clamped in a drying barrel and a dyeing barrel, and a plurality of first air swelling shafts and second air swelling shafts which are arranged in a staggered manner are arranged in the driving limiting barrel; a cotton yarn winding drum and a material guiding winding drum are arranged on the outer sides of the first air swelling shaft and the second air swelling shaft in a sleeving mode correspondingly, one end of a cotton yarn on the outer side of the cotton yarn winding drum can be fixed to the bottom of a second nut on the top of the second air swelling shaft, and then the second air swelling shaft is started to fix the material guiding winding drum on the outer side of the second air swelling shaft. A plurality of second air swelling shafts are driven to rotate to wind the cotton yarn on the outer side of the cotton yarn winding drum to the outer side of the guide winding drum on one side; when the structure is arranged in a drying cylinder and a dyeing cylinder for use, each part of the cotton yarn can be adhered to a dyeing material in a cotton yarn guiding process, so that the cotton yarn is uniformly dyed and thoroughly dried, and the processing quality of the cotton yarn is improved.

Description

Technical Field

[0001] The invention relates to the field of cotton yarn processing, and more specifically to a dyeing and drying process for cotton yarn. Background Art

[0002] Cotton is one of the world's most important crops, with high yields and low production costs, making cotton products relatively cheap. Cotton fibers can be made into a variety of fabrics, from light and transparent voile to heavy canvas and thick velvet, suitable for making all kinds of clothing, furniture fabrics and industrial fabrics. Cotton fabrics are strong and wear-resistant, can be washed and ironed at high temperatures, and are comfortable to wear because they absorb and dries quickly. In order to improve the appearance of cotton fabrics, they usually need to be dyed.

[0003] Since cotton yarn is easy to get tangled when scattered, the cotton yarn needs to be wound into regular cotton yarn rolls during dyeing and drying, which results in uneven dyeing and drying inside and outside the cotton yarn roll, thereby reducing the quality of the entire cotton yarn roll.

[0004] Therefore, in response to the above-mentioned technical problems, it is necessary to provide a dyeing and drying process for cotton yarn. Summary of the invention

[0005] The object of the present invention is to provide a cotton yarn dyeing and drying process to solve the above-mentioned problems.

[0006] In order to achieve the above purpose, the technical solution provided by an embodiment of the present invention is as follows: A dyeing and drying process for cotton yarn comprises the following steps: S1. Pre-treating the original cotton yarn, including soaking, bleaching and washing, to remove impurities and improve dyeing effect, and evenly winding the cotton yarn outside the reel to form a cotton yarn reel; S2. Pour appropriate dyes and chemicals into the dyeing cylinder, and insert the driving limit cylinder into the dyeing cylinder to drive and limit the cotton yarn, thereby dyeing the cotton yarn; S3. After dyeing, the cotton yarn needs to be fixed; S4, taking out the entire driving limit cylinder and inserting it into a drying cylinder to dry the cotton yarn roll in the driving limit cylinder to remove excess water and make the yarn reach the required moisture content; S5. Arrange and package the dried cotton yarn for subsequent processing and sales.

[0007] As a further improvement of the present invention, step S2 includes a dyeing cylinder, a second control panel is fixedly installed on the right side of the dyeing cylinder, a driving mechanism is fixedly installed on the bottom of the dyeing cylinder, a stirring rod is fixedly installed on the output end of the driving mechanism, and second limit strips are fixedly installed on the four ends of the inner side of the dyeing cylinder.

[0008] As a further improvement of the present invention, step S4 includes a drying cylinder, a first control panel is fixedly installed on the right side of the drying cylinder, a protective frame is fixedly installed in the middle of the drying cylinder, a plurality of heating tubes are fixedly installed inside the protective frame, and first limit strips are fixedly installed at the four inner ends of the drying cylinder.

[0009] As a further improvement of the present invention, a driving limit cylinder is movably provided on the inner side of the drying cylinder, and limiting grooves are provided at the four ends of the outer side of the driving limit cylinder. The limiting grooves are arranged on the outer side of the first limiting strip, and the limiting grooves are adapted to the shape of the first limiting strip. A reducing sealing cylinder is fixedly installed on the lower end of the driving limit cylinder, and the diameter of the reducing sealing cylinder is smaller than the diameter of the driving limit cylinder. A plurality of first through holes distributed in an annular array are provided on the periphery of the lower end of the driving limit cylinder, and a center cylinder is fixedly installed in the middle of the reducing sealing cylinder and the driving limit cylinder, and a plurality of second through holes are provided on the outer side and the top of the center cylinder, and the second through holes are all located inside the driving limit cylinder.

[0010] As a further improvement of the present invention, a plurality of staggered first and second air-expansion shafts are rotatably installed at the bottom of the driving limit cylinder, and the first and second air-expansion shafts are distributed in a circular array inside the driving limit cylinder with the bottom center of the driving limit cylinder as the center.

[0011] As a further improvement of the present invention, a first bearing is fixedly installed on the lower ends of the outer sides of multiple first pneumatic shafts, and the first bearing is installed in the bottom of the driving limit cylinder by a fixed embedding manner. A first nut is threadedly installed in the middle part of the upper end of the first pneumatic shaft, and a cotton yarn reel is sleeved on the outer side of the first pneumatic shaft. A first sprocket is fixedly installed on the lower end of the outer side of the first pneumatic shaft, and the first sprocket is located below the first bearing. A first chain is meshed and connected to the outer side of the first sprocket, and the first sprocket and the first chain are both sealed in a reducing sealing cylinder. A first servo motor is installed at the bottom of the first pneumatic shaft on the left, and the bottom of the first servo motor is fixedly connected to the reducing sealing cylinder, and the output end of the first servo motor is fixedly connected to the first pneumatic shaft on the left.

[0012] As a further improvement of the present invention, a second bearing is fixedly installed on the lower ends of the outer sides of multiple second pneumatic shafts, and the second bearings are installed in the bottom of the driving limit cylinder by a fixed embedding manner. A second nut is threadedly installed in the middle part of the upper end of the second pneumatic shaft, and a material guide and winding cylinder is sleeved on the outer side of the second pneumatic shaft. A second sprocket is fixedly installed on the lower end of the outer side of the second pneumatic shaft, and the second sprocket is located below the second bearing. A second chain is meshed and connected on the outer side of the second sprocket, and the second sprocket and the second chain are both sealed in a reducing sealing cylinder. A second servo motor is installed at the bottom of the second pneumatic shaft on the left side, and the bottom of the second servo motor is fixedly connected to the reducing sealing cylinder, and the output end of the second servo motor is fixedly connected to the second pneumatic shaft on the left side.

[0013] As a further improvement of the present invention, the heights of the plurality of second sprockets and second chains are lower than the heights of the first sprocket and the first chain.

[0014] As a further improvement of the present invention, the plurality of the first and second air inflation shafts are staggered, and the cotton yarn reel and the material guide and winding drum on their outer sides are also staggered. One end of the cotton yarn on the outer side of the cotton yarn reel can be clamped at the bottom limit of the second nut, and then the second air inflation shaft is started to fix the material guide and winding drum and drive the second air inflation shaft and the material guide and winding drum to rotate, while the cotton yarn reel remains active on the outer side of the first air inflation shaft. The rotation of the material guide and winding drum can automatically wind the cotton yarn on the outer side of the cotton yarn reel around its outer side. The driving limit drum is installed in the drying drum and the dyeing drum. This structure can be implemented.

[0015] As a further improvement of the present invention, the drying cylinder and the dyeing cylinder have the same internal shape, so the driving limit cylinder can be inserted in both the drying cylinder and the dyeing cylinder for use.

[0016] Compared with the prior art, the advantages of the present invention are: The present solution can be achieved by arranging a universal driving limit cylinder in the drying cylinder and the dyeing cylinder, and a plurality of staggered first and second air-inflating shafts are arranged inside the driving limit cylinder, and a cotton yarn reel and a material guide and winding reel are respectively sleeved on the outside of the first and second air-inflating shafts. One end of the cotton yarn on the outside of the cotton yarn reel can be fixed to the bottom of the second nut on the top of the second air-inflating shaft, and then the second air-inflating shaft is started to fix the material guide and winding reel on the outside, and the plurality of second air-inflating shafts are driven to rotate to wind the cotton yarn on the outside of the cotton yarn reel to the outside of the material guide and winding reel on one side. When the structure is placed inside the drying cylinder and the dyeing cylinder for use, it can ensure that every part of the cotton yarn will be attached to the dye during the cotton yarn guiding process, so that the cotton yarn can be dyed evenly and dried thoroughly, thereby improving the processing quality of the cotton yarn. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a process flow chart of the present invention; Figure 2 It is a schematic structural diagram of the installation state of the driving limiting cylinder of the present invention; Figure 3 It is a schematic diagram of the internal structure of the drying drum of the present invention; Figure 4 It is a schematic diagram of the internal structure of the dyeing cylinder of the present invention; Figure 5 It is a structural schematic diagram of the driving limiting cylinder of the present invention; Figure 6 It is a schematic cross-sectional structure diagram of the reduced diameter sealing cylinder of the present invention; Figure 7 It is a schematic structural diagram of the first air inflation shaft and the second air inflation shaft of the present invention.

[0018] Description of the numbers in the figure: 1. Drying cylinder; 1001. First limit strip; 2. First control panel; 3. Dyeing cylinder; 301. Second limit strip; 4. Second control panel; 5. Protective frame; 6. Heating tube; 7. Stirring rod; 8. Drive limit cylinder; 801. First through hole; 81. Limit groove; 82. Reduced diameter sealing cylinder; 83. Center cylinder; 831. Second through hole; 9. First air expansion shaft; 91. First nut; 92. Cotton yarn reel; 93. First bearing; 94. First sprocket; 95. First servo motor; 96. First chain; 10. Second air expansion shaft; 101. Second nut; 102. Material guide and take-up cylinder; 103. Second bearing; 104. Second sprocket; 105. Second servo motor; 106. Second chain. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0020] Embodiment 1:

[0021] See also Figure 1 , a dyeing and drying process for cotton yarn, comprising the following steps: S1, pre-treating the original cotton yarn, including soaking, bleaching and washing, to remove impurities and improve dyeing effect, and evenly winding the cotton yarn outside the reel to form a cotton yarn reel 92; S2, pouring appropriate dyes and chemicals into the dyeing cylinder 3, and inserting the driving limit cylinder 8 into the dyeing cylinder 3 to drive and limit the cotton yarn, and dyeing the cotton yarn; S3. After dyeing, the cotton yarn needs to be fixed; S4, taking out the entire driving limit cylinder 8 and inserting it into the drying cylinder 1 to dry the cotton yarn roll in the driving limit cylinder 8 to remove excess water and make the yarn reach the required moisture content; S5. Arrange and package the dried cotton yarn for subsequent processing and sales.

[0022] See also Figure 2-7 , step S2 includes a dyeing drum 3, a second control panel 4 is fixedly installed on the right side of the dyeing drum 3, a driving mechanism is fixedly installed on the bottom of the dyeing drum 3, a stirring rod 7 is fixedly installed on the output end of the driving mechanism, and second limit bars 301 are fixedly installed on the four ends of the inner side of the dyeing drum 3; Step S4 includes a drying drum 1, a first control panel 2 is fixedly installed on the right side of the drying drum 1, a protective frame 5 is fixedly installed in the middle of the drying drum 1, a plurality of heating tubes 6 are fixedly installed inside the protective frame 5, and first limit strips 1001 are fixedly installed at the four ends of the inner side of the drying drum 1; A driving limit cylinder 8 is movably provided inside the drying cylinder 1, and limiting grooves 81 are provided at the four ends of the outer side of the driving limit cylinder 8. The limiting grooves 81 are provided outside the first limiting strip 1001, and the limiting grooves 81 match the shape of the first limiting strip 1001. The internal shapes of the drying cylinder 1 and the dyeing cylinder 3 are the same, so the driving limit cylinder 8 can be inserted in both the drying cylinder 1 and the dyeing cylinder 3 for use; A reduced diameter sealing cylinder 82 is fixedly installed at the lower end of the driving limit cylinder 8. The diameter of the reduced diameter sealing cylinder 82 is smaller than the diameter of the driving limit cylinder 8. A plurality of first through holes 801 distributed in a circular array are arranged on the periphery of the lower end of the driving limit cylinder 8. A center cylinder 83 is fixedly installed in the middle of the reduced diameter sealing cylinder 82 and the driving limit cylinder 8. A plurality of second through holes 831 are arranged on the outer side and the top of the center cylinder 83, and the second through holes 831 are all located inside the driving limit cylinder 8.

[0023] Specifically, since the inner diameters of the drying cylinder 1 and the dyeing cylinder 3 are the same, and the distribution positions and shapes of the first limit strips 1001 and the second limit strips 301 on their inner sides are the same, and the protective frame 5 and the heating tube 6 inside the drying cylinder 1 are distributed in the middle of the lower end of the drying cylinder 1, the driving mechanism and the stirring rod 7 inside the dyeing cylinder 3 are also installed in the middle of the lower end of the dyeing cylinder 3. Therefore, the driving limit strip 8 is adapted to the shapes of the drying cylinder 1 and the dyeing cylinder 3. The driving limit strip 8 is first installed in the dyeing cylinder 3. After a plurality of cotton yarn reels 92 are fixed in the driving limit strip 8 for dyeing, the driving limit strip 8 can be directly taken out as a whole and inserted into the drying cylinder 1 to dry the plurality of cotton yarn reels 92. This structure can facilitate the overall movement of the cotton yarn during processing, which is convenient for cotton yarn processing.

[0024] A plurality of first and second gas expansion shafts 9 and 10 are rotatably installed at the bottom of the driving limit cylinder 8, and the first and second gas expansion shafts 9 and 10 are distributed in a circular array with the bottom circle center of the driving limit cylinder 8 as the center. A first bearing 93 is fixedly installed at the lower ends of the outer sides of the plurality of first gas expansion shafts 9. The first bearing 93 is installed at the bottom of the driving limit cylinder 8 by a fixed embedding manner. A first nut 91 is threadedly installed at the middle part of the upper end of the first gas expansion shaft 9. A cotton yarn reel 92 is sleeved on the outer side of the first gas expansion shaft 9. A first sprocket 94 is fixedly installed at the lower end of the outer side of the first gas expansion shaft 9. The first sprocket 94 is located below the first bearing 93. A first chain 96 is meshedly connected to the outer side of the first sprocket 94. The first sprocket 94 and the first chain 96 are both sealed in the reduced diameter sealing cylinder 82. A first servo motor 95 is installed at the bottom of the left first gas expansion shaft 9. The bottom of the first servo motor 95 is fixedly connected to the reduced diameter sealing cylinder 82. The output end of the first servo motor 95 is connected to the reduced diameter sealing cylinder 82. The first gas expansion shaft 9 on the left is fixedly connected, and the second bearings 103 are fixedly installed on the lower ends of the outer sides of the plurality of second gas expansion shafts 10. The second bearings 103 are installed on the bottom of the driving limit tube 8 by a fixed embedding manner. A second nut 101 is threadedly installed on the middle part of the upper end of the second gas expansion shaft 10. A material guide and winding drum 102 is sleeved on the outer side of the second gas expansion shaft 10. A second sprocket 104 is fixedly installed on the lower end of the outer side of the second gas expansion shaft 10. The second sprocket 104 is located below the second bearing 103. A second chain 106 is meshed and connected on the outer side of the second sprocket 104. The second sprocket 104 and the second chain 106 are both sealed in the reduced diameter sealing tube 82. A second servo motor 105 is installed on the bottom of the second gas expansion shaft 10 on the left. The bottom of the second servo motor 105 is fixedly connected to the reduced diameter sealing tube 82. The output end of the second servo motor 105 is fixedly connected to the second gas expansion shaft 10 on the left. The heights of the plurality of second sprockets 104 and the second chain 106 are lower than those of the first sprocket 94 and the first chain 96.

[0025] Specifically, multiple cotton yarn reels 92 are sleeved on the outside of the first air expansion shaft 9, multiple material guide and winding drums 102 are sleeved on the outside of the second air expansion shaft 10, and one end of the cotton yarn on the outside of the cotton yarn reel 92 is inserted into the lower end of the second nut 101 on the top of the second air expansion shaft 10 to fix one end of the cotton yarn, and then the driving limit cylinder 8 is inserted into the dyeing cylinder 3 as a whole, and through the setting of multiple first through holes 801 and second through holes 831, the dyeing material in the dyeing cylinder 3 can be transferred to the driving limit cylinder 8 to soak the cotton yarn reel 92, and then the second servo motor 105 is started to drive multiple second air expansion shafts 10, and the material guide and winding drum 102 is fixed on the outside of the second air expansion shaft 10. The second servo motor 105 drives multiple second sprockets 104 and the second air expansion shaft 10 to rotate under the linkage of the second chain 106. When the material guide and winding drum 102 rotates, the cotton yarn The cotton yarn on the outside of the reel 92 is guided to the outside thereof and wound around, so that the cotton yarn can contact the dye at every point during the material guiding process, thereby improving the dyeing effect of the cotton yarn and making the dyeing more uniform; after the dyeing and fixing is completed, the driving limit cylinder 8 can be taken out of the dyeing cylinder 3 and inserted into the drying cylinder 1, and one end of the cotton yarn wound on the outside of the material guiding and winding drum 102 is fixed to the bottom of the first nut 91 at the upper end of the first air inflation shaft 9, one end of the cotton yarn is fixed, and then the first air inflation shaft 9 is started to fix the cotton yarn reel 92 on its outside, and the first servo motor 95 is started to drive the first chain 96, the first sprocket 94 and multiple first air inflation shafts 9 to rotate simultaneously, and the cotton yarn on the outside of the material guiding and winding drum 102 is rewound around the outside of the cotton yarn reel 92, and every point of the cotton yarn can contact the air inside the drying drum 1 during the material guiding process, thereby effectively improving the drying effect of the cotton yarn.

[0026] Multiple first air inflation shafts 9 and second air inflation shafts 10 are staggered, and the cotton yarn reel 92 and the material guide and winding drum 102 on the outside are also staggered. One end of the cotton yarn on the outside of the cotton yarn reel 92 can be clamped at the bottom limit of the second nut 101, and then the second air inflation shaft 10 is started to fix the material guide and winding drum 102 and drive the second air inflation shaft 10 and the material guide and winding drum 102 to rotate, while the cotton yarn reel 92 remains active on the outside of the first air inflation shaft 9. The rotation of the material guide and winding drum 102 can automatically wind the cotton yarn on the outside of the cotton yarn reel 92 around its outside. The driving limit drum 8 is installed in the drying drum 1 and the dyeing drum 3. This structure can be implemented.

[0027] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0028] In addition, it should be understood that although the present specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that those skilled in the art can understand.

Claims

1. A dyeing and drying process for cotton yarn, characterized in that: The following steps are involved: S1, pre-treating the original cotton yarn, including soaking, bleaching and washing, to remove impurities and improve dyeing effect, and evenly winding the cotton yarn outside the reel to form a cotton yarn reel (92); S2, pouring appropriate dyes and chemicals into the dyeing cylinder (3), and inserting the driving limit cylinder (8) into the dyeing cylinder (3) to drive and limit the cotton yarn, thereby dyeing the cotton yarn; S3. After dyeing, the cotton yarn needs to be fixed; S4, taking out the entire driving limit cylinder (8) and inserting it into the drying cylinder (1) to dry the cotton yarn roll in the driving limit cylinder (8) to remove excess water and make the yarn reach the required moisture content; S5. Arrange and package the dried cotton yarn for subsequent processing and sales; A plurality of staggered first air expansion shafts (9) and second air expansion shafts (10) are rotatably mounted on the bottom of the driving limit cylinder (8), and the first air expansion shafts (9) and the second air expansion shafts (10) are arranged in a circular array with the bottom circle center of the driving limit cylinder (8) as the center, and the plurality of the first air expansion shafts (9) and the second air expansion shafts (10) are staggered, and the cotton yarn reels (92) and the guide and winding reels (102) outside the cotton yarn reels (92) are also staggered, so that the cotton yarn reels (92) outside the cotton yarn reels (92) can be staggered. One end of the yarn is clamped at the bottom of the second nut (101) to limit the position, and then the second air expansion shaft (10) is started to fix the material guide winding drum (102) and drive the second air expansion shaft (10) and the material guide winding drum (102) to rotate, while the cotton yarn reel (92) remains in an active state outside the first air expansion shaft (9), and the material guide winding drum (102) rotates to automatically wind the cotton yarn outside the cotton yarn reel (92) outside the cotton yarn reel (92), and the driving limit drum (8) is installed in the drying drum (1) and the dyeing drum (3). This structure can be implemented.

2. The dyeing and drying process for cotton yarn according to claim 1, characterized in that: The step S2 comprises a dyeing cylinder (3), a second control panel (4) being fixedly mounted on the right side of the dyeing cylinder (3), a driving mechanism being fixedly mounted on the inner bottom of the dyeing cylinder (3), a stirring rod (7) being fixedly mounted on the output end of the driving mechanism, and second limit bars (301) being fixedly mounted on the four inner ends of the dyeing cylinder (3).

3. The dyeing and drying process for cotton yarn according to claim 1, characterized in that: The step S4 comprises a drying cylinder (1), a first control panel (2) being fixedly mounted on the right side of the drying cylinder (1), a protective frame (5) being fixedly mounted in the middle of the drying cylinder (1), a plurality of heating tubes (6) being fixedly mounted inside the protective frame (5), and first limit strips (1001) being fixedly mounted at the four inner ends of the drying cylinder (1).

4. The dyeing and drying process for cotton yarn according to claim 3, characterized in that: A driving limit cylinder (8) is movably clamped inside the drying cylinder (1), and limit grooves (81) are arranged at four ends of the outer side of the driving limit cylinder (8). The limit grooves (81) are clamped on the outer side of the first limit strip (1001), and the shape of the limit grooves (81) matches that of the first limit strip (1001). A reduced diameter sealing cylinder (82) is fixedly mounted on the lower end of the driving limit cylinder (8), and the diameter of the reduced diameter sealing cylinder (82) is smaller than the diameter of the driving limit cylinder (8). A plurality of first through holes (801) arranged in a circular array are arranged on the periphery of the lower end of the driving limit cylinder (8), and a central cylinder (83) is fixedly mounted in the middle of the reduced diameter sealing cylinder (82) and the driving limit cylinder (8). A plurality of second through holes (831) are arranged on the outer side and the top of the central cylinder (83), and the second through holes (831) are all located inside the driving limit cylinder (8).

5. The dyeing and drying process for cotton yarn according to claim 1, characterized in that: A first bearing (93) is fixedly mounted on the lower ends of the outer sides of the plurality of first gas expansion shafts (9). The first bearing (93) is fixedly mounted on the bottom of the driving limit cylinder (8) by means of a fixed embedding manner. A first nut (91) is threadedly mounted on the middle portion of the upper end of the first gas expansion shaft (9). A cotton yarn reel (92) is sleeved on the outer side of the first gas expansion shaft (9). A first sprocket (94) is fixedly mounted on the lower end of the outer side of the first gas expansion shaft (9). The first sprocket (94) is located below the first bearing (93). A first chain (96) is meshedly connected to the outer side of the first sprocket (94). The first sprocket (94) and the first chain (96) are both sealed and arranged in a reduced diameter sealing cylinder (82). A first servo motor (95) is mounted on the bottom of the first gas expansion shaft (9) on the left side. The bottom of the first servo motor (95) is fixedly connected to the reduced diameter sealing cylinder (82). The output end of the first servo motor (95) is fixedly connected to the first gas expansion shaft (9) on the left side.

6. The dyeing and drying process for cotton yarn according to claim 1, characterized in that: A second bearing (103) is fixedly mounted on the lower ends of the outer sides of the plurality of second gas expansion shafts (10). The second bearing (103) is fixedly mounted on the inner bottom of the driving limit cylinder (8) by means of a fixed embedding manner. A second nut (101) is threadedly mounted on the middle part of the upper end of the second gas expansion shaft (10). A material guide and winding cylinder (102) is sleeved on the outer side of the second gas expansion shaft (10). A second sprocket (104) is fixedly mounted on the lower end of the outer side of the second gas expansion shaft (10). The second sprocket (104) is located below the second bearing (103). A second chain (106) is meshedly connected on the outer side of the second sprocket (104). Both the second sprocket (104) and the second chain (106) are sealed in a reduced diameter sealing cylinder (82). A second servo motor (105) is mounted on the bottom of the second gas expansion shaft (10) on the left side. The bottom of the second servo motor (105) is fixedly connected to the reduced diameter sealing cylinder (82). The output end of the second servo motor (105) is fixedly connected to the second gas expansion shaft (10) on the left side.

7. The dyeing and drying process for cotton yarn according to claim 6, characterized in that: The heights of the plurality of second sprockets (104) and the second chains (106) are lower than the heights of the first sprockets (94) and the first chains (96).

8. The dyeing and drying process for cotton yarn according to claim 4, characterized in that: The drying cylinder (1) and the dyeing cylinder (3) have the same internal shape, so the driving limit cylinder (8) can be inserted into both the drying cylinder (1) and the dyeing cylinder (3) for use.

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