A coated core yarn based on double staple fibers and its production equipment and processing technology

Abstract

The present application relates to a coated core yarn based on double staple fibers and its production equipment and processing technology, which belongs to the technical field of coated core yarn processing. It includes a roving car and a modified bell mouth, which is fixed on the roving car. The modified bell mouth includes an upper wire passing seat and a lower wire passing seat. The upper wire passing seat is provided with an upper wire passing opening, and the lower wire passing seat is provided with a lower wire passing opening. The upper wire passing seat is fixed at the middle position of the lower wire passing opening. The present application has the function of improving the coating effect.

Description

Technical Field

[0001] The present application relates to the technical field of coated core yarn processing, and in particular to a coated core yarn based on double staple fibers, and a production device and processing technology thereof. Background Art

[0002] A covered core yarn is a special type of yarn composed of two or more fibers or yarns with different properties. Typically, one fiber or yarn serves as the core, and another fiber or yarn is spirally wrapped around the core. This structure allows covered core yarns to combine the advantages of different fibers or yarns, such as strength, elasticity, abrasion resistance, and hand feel, thus expanding their application.

[0003] At present, most of the covered core yarns are processed on spinning machines, and the covering is formed by utilizing the difference in the number of the outer covering fiber and the core yarn and the twisting process, thereby forming a covered core yarn; during the covering process, the modified bell mouth can guide the yarn to smoothly enter the covering area during the covering process, but the outer covering fiber and the core yarn pass through the same caliber, and the core yarn cannot always remain in the center of the outer covering fiber, resulting in a defect of poor covering effect. Summary of the Invention

[0004] In order to improve the coating effect, the present application provides a coated core yarn based on double staple fibers, and its production equipment and processing technology.

[0005] The present application provides a production device for coated core yarn, which adopts the following technical solution:

[0006] A production equipment for covered core yarn includes a roving car and a modified bell mouth, which is fixed on the roving car. The modified bell mouth includes an upper wire passing seat and a lower wire passing seat. The upper wire passing seat is provided with an upper wire passing opening, and the lower wire passing seat is provided with a lower wire passing opening. The upper wire passing seat is fixed at the middle position of the lower wire passing opening.

[0007] Using the above technical solution, the modified bell mouth is divided into two parts, which are upper and lower structures, and the upper wire seat is located in the middle position of the lower wire seat, thereby ensuring that the core yarn is located in the center of the outer covering fiber, thereby improving the covering effect.

[0008] Optionally, a first adjusting component for adjusting the diameter of the upper thread passing opening is provided in the upper thread passing opening, and the first adjusting component includes a first diameter-changing component and a first driving component;

[0009] The first variable diameter assembly comprises a fixing ring, a fixing seat, an adjusting ring and an upper adjusting plate, a suspension rod is fixedly provided between the fixing ring and the upper wire seat, the fixing seat is fixed to the inner wall of the upper wire seat, the adjusting ring is sleeved on the fixing ring and a gap is left between the two, the adjusting ring passes through the fixing seat and the two are slidably adapted, and an avoidance groove for avoiding the suspension rod is opened on the adjusting ring, and the upper adjusting plates are provided with multiple, and the multiple upper adjusting plates are all arranged in the inner ring of the fixing ring, the upper adjusting plates are arranged around the central axis of the fixing ring, a reset spring is fixed between the upper adjusting plate and the fixing ring, an upper adjusting rod is fixedly connected to the upper adjusting plate, the upper adjusting rod passes through the fixing ring and the two are slidably adapted, and an adjusting block for squeezing the upper adjusting rod is fixed on the inner wall of the adjusting ring;

[0010] The first driving assembly is used to move the position of the upper adjusting plate.

[0011] By adopting the above technical solution, the adjustment ring moves the adjustment block away from or squeezes the adjustment rod during rotation, and at the same time cooperates with the reset spring to make the positions of multiple upper adjustment plates change synchronously, thereby changing the diameter of the opening through which the core yarn passes, thereby adapting to core yarns of different diameters and improving the adaptability of the device.

[0012] Optionally, a base is fixedly provided on the inner wall of the upper wire seat;

[0013] The first driving assembly includes a driving roller, a driving gear and a driving ring gear, wherein the driving roller passes through the base and the two are rotatably connected, the driving gear is sleeved on the driving roller and the two are fixed, and the driving ring gear is meshed with the driving gear, and the driving ring gear is sleeved on the adjusting ring and the two are fixed;

[0014] The first adjustment component also includes a limiting component, which is used to fix the driving roller.

[0015] By adopting the above technical solution, when the driving roller rotates, the driving gear rotates the driving ring gear, thereby rotating the adjusting ring, thereby facilitating the rotation of the adjusting ring.

[0016] Optionally, the limiting assembly includes a ratchet and two pawls, the ratchet is sleeved on the driving roller and the two are fixed to each other, the two pawls are respectively arranged on both sides of the ratchet, the two pawls are snap-fitted with the ratchet, and the pawls are rotatably connected to the base.

[0017] With this technical solution, when the drive roller needs to rotate, the operator moves the pawl to disengage the pawl from the ratchet, so that the pawl and ratchet no longer secure the drive roller. When the drive roller does not need to rotate, the operator moves the pawl to engage the ratchet, so that the pawl and ratchet secure the drive roller. In this way, the pawl and ratchet secure the drive roller when it is not rotating, thereby securing the adjustment ring and, in turn, preventing the upper adjustment plate from changing position.

[0018] Optionally, a second adjustment component for adjusting the diameter of the lower wire passing opening is provided in the lower wire passing opening, and the second adjustment component includes a second diameter-changing component and a second driving component;

[0019] A driving cavity is provided in the lower wire passing seat, and through grooves are provided on both sides of the lower wire passing seat to connect the driving cavity with the outside world;

[0020] The second diameter reducing assembly includes a lower adjustment plate and a lower adjustment rod. The number of the lower adjustment rods, the lower adjustment plates, and the through slots are the same and correspond one to one. The two lower adjustment plates are axially symmetrically arranged. The lower adjustment rod is arranged in the driving cavity. One end of the lower adjustment rod extends from the through slot and is fixed to the lower adjustment plate.

[0021] The second driving assembly is used to move the position of the lower adjusting rod.

[0022] By adopting the above technical solution, the position of the lower adjusting plate is adjusted by adjusting the position of the lower adjusting rod, thereby changing the diameter of the opening through which the core yarn passes, thereby adapting to outer covering fibers of different widths and improving the adaptability of the device.

[0023] Optionally, the second driving assembly includes a fixed plate, a driving sleeve and a driving shaft, the fixed plate is fixed in the driving cavity of the lower wire seat, the driving sleeve passes through the fixed plate and the two are rotatably connected, a driven bevel gear is sleeved on the driving sleeve and the two are fixed, both ends of the driving sleeve are provided with threads, and the two sections of the thread of the driving sleeve rotate in opposite directions, the two lower adjusting rods are inserted into the driving sleeve at one end close to the driving sleeve, the lower adjusting rod is threadedly connected to the driving sleeve, the driving shaft is rotatably connected to the lower wire seat, one end of the driving shaft extends to the outside, and the other end of the driving shaft extends into the driving cavity, and the end of the driving shaft extending into the driving cavity is fixedly connected to an active bevel gear that meshes with the driven bevel gear.

[0024] By adopting the above technical solution, the staff rotates the drive shaft through the active bevel gear and the driven bevel gear to rotate the drive sleeve, so that the two lower adjustment rods move closer to or farther away from each other, thereby making the two lower adjustment plates move closer to or farther away from each other.

[0025] Optionally, a connecting block is fixedly connected to the upper wire passing seat, and a connecting groove that is interference-fitted with the connecting block is formed on the lower wire passing seat.

[0026] By adopting the above technical solution, the bell mouth is modified into a split type, so that the upper wire seat or the lower wire seat can be replaced separately, reducing maintenance costs; through the interference fit between the connecting block and the connecting groove, the assembly and disassembly of the upper wire seat and the lower wire seat are very convenient.

[0027] The present application provides a production process for a coated core yarn, comprising the following steps:

[0028] S1. Select core yarn and outer covering fiber;

[0029] S2. Use a roving machine to cover the sliver and roving at the roving stage, with the core yarn passing through the upper thread mouth and the outer covering fiber passing through the lower thread mouth;

[0030] S3. After the coating is completed, the coated core yarn is heat-treated to fix the coating structure.

[0031] By adopting the above technical solution, the covering process is transferred from the roving process to the coarse roving process, and the width of the outer covering fiber is large, thereby improving the covering rate.

[0032] Optionally, the S2 sliver has a basis weight of 10.7 g / 5m, the roving has a basis weight of 4.0 g / 10m, and the roving twist coefficient is 140.

[0033] By adopting the above technical solution, the yarn ratio is determined by quantitatively determining the sliver and the roving, thereby reducing the leakage of the core yarn and improving the covering rate.

[0034] The present application provides a double-staple fiber covered core yarn, which adopts the following technical solution:

[0035] A double-short fiber coated core yarn comprises: the outer coating fiber of the coated core yarn and the core yarn are both short fibers, and the ratio of the outer coating fiber to the core yarn is 80-85:15-20.

[0036] By adopting the above technical solution, the covering of two short fibers is achieved, filling the gap in short fiber core-spun yarn products. At the same time, this yarn has the advantages of moisture absorption, warmth retention and color fastness. The fabric woven from the yarn has multiple advantages such as warmth, moisture absorption, wear resistance and color fastness.

[0037] In summary, this application includes at least one of the following beneficial technical effects:

[0038] 1. The modified bell mouth is divided into an upper thread seat and a lower thread seat. The upper thread seat is located in the middle of the lower thread seat to ensure that the core yarn is located in the center of the outer covering fiber, thereby improving the covering effect; the diameters of the upper thread mouth and the lower thread mouth can be adjusted, which improves the applicability of the device.

[0039] 2. The covering process is transferred from the roving process to the coarse yarn process. The raw material for the coarse yarn process is sliver, and the raw material for the sliver process is roving. The number of fibers per unit cross section of sliver is more than that of roving. The core yarn is easier to cover during the drafting process of sliver, that is, it is easier to produce covered core yarn with a high coverage rate in the coarse yarn process. The coverage rate of the covered core yarn is 85%-90%. The covering of the two short fibers fills the gap in short-fiber core-spun yarn products. At the same time, this yarn has the advantages of moisture absorption, warmth retention and color fastness. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a schematic structural diagram of a production device for a coated core yarn according to Example 1 of the present application;

[0041] Figure 2 This is a structural schematic diagram of a modified bell mouth in a production device for covered core yarn according to Example 2 of the present application;

[0042] Figure 3 This is an exploded view showing the installation method of the upper and lower wire holders in Example 2 of the present application;

[0043] Figure 4 This is a structural diagram illustrating the adjustment method of the upper adjustment plate in Example 2 of the present application;

[0044] Figure 5 This is a structural diagram illustrating the rotation mode of the adjustment ring in Example 2 of the present application;

[0045] Figure 6 yes Figure 5 A partial enlarged schematic diagram of part A;

[0046] Figure 7 This is a partial cross-sectional view illustrating the adjustment method of the lower adjustment plate in Example 2 of the present application.

[0047] In the figure, 1. Modified bell mouth; 11. Upper wire seat; 111. Upper wire opening; 112. Base; 113. Connecting block; 12. Lower wire seat; 121. Lower wire opening; 122. Drive cavity; 123. Through slot; 124. Connecting slot; 125. Guide rod; 2. First reducing assembly; 21. Fixed ring; 211. Hanging rod; 212. Return spring; 213. Upper adjusting rod; 22. Fixed seat; 23. Adjusting ring; 231. Avoidance slot; 232. Adjusting block; 24. Upper adjusting plate; 3. First drive assembly; 31. Drive roller; 311. Knob; 32. Drive gear; 33. Drive ring gear; 4. Limit assembly; 41. Ratchet; 42. Pawl; 5. Second reducing assembly; 51. Lower adjusting plate; 52. Lower adjusting rod; 6. Second drive assembly; 61. Fixed plate; 62. Drive sleeve; 621. Driven bevel gear; 63. Drive shaft; 631. Active bevel gear; 7. Front roller; 8. Middle roller; 9. Back roller; 10. Discharge assembly; 101. Discharge barrel; 102. Hanging ingot. DETAILED DESCRIPTION

[0048] The following is combined with Figure 1-7 This application is described in further detail.

[0049] The embodiments of the present application disclose a coated core yarn based on double staple fibers, and a production device and processing technology thereof.

[0050] Example 1

[0051] refer to Figure 1A production equipment for coated core yarn includes a roving car, and a discharge component 10 is provided on one side of the roving car. The discharge component 10 includes a discharge cylinder 101 and a hanging spindle 102. The discharge cylinder 101 contains outer coating fibers, and the hanging spindle 102 is wound with core yarn. The hanging spindle 102 facilitates the unwinding of the core yarn.

[0052] refer to Figure 1 The roving machine includes a front roller 7, a middle roller 8 and a rear roller 9. A modified bell mouth 1 is installed on the side of the rear roller 9 away from the middle roller 8. The modified bell mouth 1 is symmetrical along the vertical plane. The modified bell mouth 1 is an upper and lower split structure. The modified bell mouth 1 includes an upper wire seat 11 and a lower wire seat 12. The upper wire seat 11 is fixed to the lower wire seat 12. The original car bell mouth is installed between the middle roller 8 and the rear roller 9. The original car bell mouth is a prior art and will not be described in detail in this application.

[0053] The implementation principle of the production equipment of a coated core yarn in Example 1 of the present application is: the outer coating fiber passes through the lower wire seat 12, the core yarn passes through the upper wire seat 11, and then the outer coating fiber and the core yarn are gathered by the rear roller 9, and then the outer coating fiber and the core yarn are gathered and passed through the original machine horn, so as to ensure that the core yarn is located in the center of the outer coating fiber, thereby improving the coating effect.

[0054] Example 2

[0055] The difference between Example 2 and Example 1 is that:

[0056] refer to Figure 2 An upper wire passing opening 111 is opened through the upper wire passing seat 11, and a first adjusting component for adjusting the diameter of the upper wire passing opening 111 is provided in the upper wire passing opening 111. A lower wire passing opening 121 is opened through the lower wire passing seat 12, and a second adjusting component for adjusting the diameter of the lower wire passing opening 121 is provided in the lower wire passing opening 121.

[0057] Fix the upper thread passing seat 11 on the lower thread passing seat 12, then adjust the diameter of the upper thread passing opening 111 through the first adjusting component, and then adjust the diameter of the lower thread passing opening 121 through the second adjusting component, and finally glue and fix the modified trumpet mouth 1 on the roving car.

[0058] refer to Figure 3 A connecting groove 124 is provided in the middle of the upper surface of the lower wire seat 12 , and a connecting block 113 which is interference-fitted with the connecting groove 124 is fixed on the lower surface of the upper wire seat 11 .

[0059] The staff moves the upper wire seat 11 to align the connecting block 113 with the connecting groove 124, and then presses the upper wire seat 11 to insert the connecting block 113 into the connecting groove 124, thereby completing the assembly of the modified bell mouth 1.

[0060] refer to Figure 2 and Figure 4 The first adjusting component includes a first reducing component 2, and the first reducing component 2 also includes a fixed seat 22 and an adjusting ring 23. The fixed seat 22 is provided with one, and the fixed seat 22 is fixedly connected to the inner wall of the upper wire seat 11 at the upper wire opening 111. The adjusting ring 23 passes through the fixed seat 22 and the two are slidably adapted. An adjusting block 232 is fixedly provided on the inner wall of the adjusting ring 23, and an avoidance groove 231 is opened through the adjusting ring 23. There are three avoidance grooves 231, and the three avoidance grooves 231 are evenly spaced around the central axis of the adjusting ring 23.

[0061] refer to Figure 2 and Figure 5 The upper wire seat 11 is fixedly provided with a base 112 on the inner wall at the upper wire mouth 111. There are two bases 112, and the two bases 112 are respectively arranged at the two ends of the upper wire seat 11. The first adjustment component also includes a first driving component 3. The first driving component 3 includes a driving roller 31. The driving roller 31 is rotatably connected between the two bases 112. The driving roller 31 passes through one of the bases 112. The driving roller 31 passes through one end of the base 112 and is fixedly connected with a knob 311.

[0062] refer to Figure 5 The first driving assembly 3 also includes a driving gear 32 and a driving ring gear 33. The driving gear 32 is mounted on the driving roller 31 and the two are fixed to each other. The driving ring gear 33 is engaged with the driving gear 32. The driving ring gear 33 is mounted on the adjusting ring 23 and the two are fixed to each other.

[0063] refer to Figure 5 and Figure 6 The first adjustment component also includes a limit component 4, which includes a ratchet 41 and two pawls 42. The ratchet 41 is sleeved on one end of the driving roller 31 close to the knob 311. The ratchet 41 is fixed to the driving roller 31. The two pawls 42 are respectively arranged on both sides of the ratchet 41. The two pawls 42 are both engaged and adapted with the ratchet 41, and the pawls 42 are rotatably connected to the base 112 close to the knob 311.

[0064] refer to Figure 2 and Figure 4The first diameter reducing assembly 2 includes a fixed ring 21 and an upper adjustment plate 24. A suspension rod 211 is fixed between the fixed ring 21 and the upper wire seat 11. The number of suspension rods 211 is the same as the number of avoidance grooves 231 and corresponds one to one. The suspension rod 211 passes through the avoidance groove 231. The upper adjustment plate 24 is arc-shaped. There are three upper adjustment plates 24. The three upper adjustment plates 24 are all arranged in the inner circle of the fixed ring 21, and the three upper adjustment plates 24 are evenly spaced around the central axis of the upper wire port 111. The upper adjustment plate 24 is arranged through the fixed ring 21. Rod 213 and the two are slidably adapted. There are three upper adjusting rods 213, and the three upper adjusting rods 213 are evenly spaced around the central axis of the upper wire mouth 111. One end of the upper adjusting rod 213 is fixed to the convex surface of the upper adjusting plate 24, and the other end of the upper adjusting rod 213 is provided with an inclined surface. The inclined surface of the upper adjusting rod 213 abuts against the adjusting block 232. A return spring 212 is sleeved on the upper adjusting rod 213, and the two ends of the return spring 212 are respectively fixed to the inner ring of the fixing ring 21 and the convex surface of the upper adjusting plate 24.

[0065] The staff moves the two pawls 42 to separate the two pawls 42 from the ratchet 41, and then the staff turns the knob 311 to drive the driving roller 31 to rotate, the driving roller 31 drives the driving gear 32 to rotate, the driving gear 32 drives the driving ring gear 33 to rotate, the driving ring gear 33 drives the adjusting ring 23 to rotate, and the adjusting ring 23 drives the adjusting block 232 to rotate, so that the adjusting block 232 squeezes or moves away from the inclined surface of the upper adjusting rod 213.

[0066] When the adjusting block 232 squeezes the inclined surface of the upper adjusting rod 213, the upper adjusting rod 213 drives the upper adjusting plate 24 to retract inward, thereby reducing the passable diameter of the upper wire seat 11. At this time, the reset spring 212 is in a stretched state; when the adjusting block 232 moves away from the inclined surface of the upper adjusting rod 213, the reset spring 212 releases the elastic force to drive the upper adjusting plate 24 to move outward, thereby increasing the passable diameter of the upper wire seat 11.

[0067] After the adjustment of the passable diameter of the upper thread holder 11 is completed, the staff will move the two pawls 42 again to engage the two pawls 42 with the ratchet 41, thereby fixing the driving roller 31 and keeping the passable diameter of the upper thread holder 11 stable.

[0068] refer to Figure 7A driving cavity 122 is provided in the lower wire seat 12, and the driving cavity 122 is concave. Both sides of the lower wire seat 12 are provided with through grooves 123 that connect the driving cavity 122 with the outside world. The second adjusting component includes a second reducing component 5, and the second reducing component 5 includes two lower adjusting rods 52. The lower adjusting rod 52 is concave, and the two lower adjusting rods 52 are respectively arranged on both sides of the driving cavity 122. The bottom end of the lower adjusting rod 52 extends from the through groove 123, and the lower wire seat 12 is fixed with a guide rod 125 on the inner side of the driving cavity 122. The guide rod 125 passes through the middle position of the lower adjusting rod 52 and the two are slidably adapted.

[0069] refer to Figure 7 The second reducing assembly 5 also includes two lower adjusting plates 51, which are arc-shaped. The two lower adjusting plates 51 are relatively arranged on both sides of the lower wire passing opening 121, and the concave surfaces of the two lower adjusting plates 51 are opposite to each other. The convex surfaces of the two lower adjusting plates 51 are respectively fixed to one end of the two lower adjusting rods 52 extending out of the through slot 123.

[0070] refer to Figure 7 The second adjusting assembly also includes a second driving assembly 6, which includes a fixing plate 61, a driving sleeve 62 and a driving shaft 63. The fixing plate 61 is fixed in the driving cavity 122 of the lower wire seat 12, and the driving sleeve 62 passes through the fixing plate 61 and the two are rotatably connected. Both ends of the driving sleeve 62 are provided with threads, and the two sections of the threads of the driving sleeve 62 rotate in opposite directions. One end of the top of the two lower adjusting rods 52 is respectively inserted into the two ends of the driving sleeve 62, and the lower adjusting rod 52 is threadedly connected to the driving sleeve 62. A driven bevel gear 621 is sleeved on the driving sleeve 62 and the two are fixed. The driving shaft 63 is rotatably connected to the lower wire seat 12, and one end of the driving shaft 63 extends to the outside. The end of the driving shaft 63 extending to the outside is fixedly connected to the handwheel, and the other end of the driving shaft 63 extends into the driving cavity 122. One end of the driving shaft 63 extending into the driving cavity 122 is fixedly connected to the active bevel gear 631 meshing with the driven bevel gear 621.

[0071] The staff rotates the handwheel to drive the drive shaft 63, the drive shaft 63 drives the active bevel gear 631 to rotate, the active bevel gear 631 drives the driven bevel gear 621 to rotate, and the driven bevel gear 621 drives the drive sleeve 62 to rotate, so that the drive sleeve 62 drives the two lower adjustment rods 52 to move toward or away from each other along the guide rod 125.

[0072] When the two lower adjusting rods 52 move toward each other, the two lower adjusting rods 52 drive the two lower adjusting plates 51 to move toward each other, thereby reducing the passable diameter of the lower wire seat 12; when the two lower adjusting rods 52 move away from each other, the two lower adjusting rods 52 drive the two lower adjusting plates 51 to move away from each other, thereby increasing the passable diameter of the lower wire seat.

[0073] The difference between Example 2 of the present application and Example 1 is that the implementation principle is as follows: the upper thread holder 11 is fixedly installed on the lower thread holder 12 by inserting the connecting block 113 into the connecting groove 124, and then the assembled modified bell mouth 1 is fixed to the roving car. The staff rotates the driving roller 31 to drive the adjusting ring 23 to rotate through the driving gear 32 and the driving ring gear 33, thereby changing the degree of compression of the upper adjusting rod 213 by the adjusting block 232, thereby adjusting the position of the upper adjusting plate 24, and then adjusting the passable diameter of the upper thread holder 11; the staff rotates the driving shaft 63 to drive the driving sleeve 62 to rotate through the active bevel gear 631 and the driven bevel gear 621, thereby adjusting the position of the lower adjusting rod 52, thereby adjusting the position of the lower adjusting plate 51, and then adjusting the passable diameter of the lower thread holder 12. In this way, the effect of improving the coating effect is achieved.

[0074] The present application also discloses a production process for a coated core yarn, comprising the following steps:

[0075] S1. Select core yarn and outer covering fiber;

[0076] S2. Use a roving machine to cover the sliver and roving at the roving stage. The sliver has a basis weight of 10.7 g / 5 m, the roving has a basis weight of 4.0 g / 10 m, and the roving twist coefficient is 140. The core yarn passes through the upper thread opening 111, and the outer covering fiber passes through the lower thread opening 121.

[0077] S3. After the coating is completed, the coated core yarn is heat-treated to fix the coating structure.

[0078] The embodiment of the present application also discloses a double-short fiber coated core yarn, wherein the outer coating fiber and the core yarn of the coated core yarn are both short fibers, and the ratio of the outer coating fiber to the core yarn is 82:18, and the coating rate of the coated core yarn is 87%.

[0079] The embodiments of this specific implementation method are all preferred embodiments of the present application and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A production device for coated core yarn, comprising a roving machine, characterized in that: The modified bell mouth (1) is fixed on the roving car, and the modified bell mouth (1) includes an upper thread passing seat (11) and a lower thread passing seat (12). An upper thread passing opening (111) is provided through the upper thread passing seat (11), and a lower thread passing opening (121) is provided through the lower thread passing seat (12). The upper thread passing seat (11) is fixed at a middle position of the lower thread passing opening (121). A first adjustment component for adjusting the diameter of the upper thread passing opening (111) is provided in the upper thread passing opening (111), and the first adjustment component includes a first diameter-changing component (2) and a first driving component (3); The first diameter-changing component (2) comprises a fixing ring (21), a fixing seat (22), an adjusting ring (23) and an upper adjusting plate (24); a suspension rod (211) is fixed between the fixing ring (21) and the upper wire-passing seat (11); the fixing seat (22) is fixed to the inner wall of the upper wire-passing seat (11); the adjusting ring (23) is sleeved on the fixing ring (21) with a gap between the fixing ring (21) and the fixing seat (22) and the fixing seat (22) are slidably fitted therebetween; and an avoidance groove (231) for avoiding the suspension rod (211) is provided on the adjusting ring (23). , a plurality of upper adjustment plates (24) are provided, and the plurality of upper adjustment plates (24) are all provided in the inner ring of the fixing ring (21), and the upper adjustment plates (24) are provided around the central axis of the fixing ring (21), and a return spring (212) is fixedly provided between the upper adjustment plate (24) and the fixing ring (21), and an upper adjustment rod (213) is fixedly connected to the upper adjustment plate (24), and the upper adjustment rod (213) passes through the fixing ring (21) and is slidably fitted therebetween, and an adjustment block (232) for squeezing the upper adjustment rod (213) is fixedly provided on the inner wall of the adjustment ring (23); The first driving assembly (3) is used to move the position of the upper adjustment plate (24); A second adjustment component for adjusting the diameter of the lower wire passing opening (121) is provided in the lower wire passing opening (121), and the second adjustment component comprises a second diameter-changing component (5) and a second driving component (6).

2. The production equipment for coated core yarn according to claim 1, characterized in that: The inner wall of the upper wire seat (11) is fixedly provided with a base (112); The first driving assembly (3) comprises a driving roller (31), a driving gear (32) and a driving ring gear (33); the driving roller (31) passes through the base (112) and the two are rotatably connected; the driving gear (32) is sleeved on the driving roller (31) and the two are fixed; the driving ring gear (33) is meshed with the driving gear (32); the driving ring gear (33) is sleeved on the adjusting ring (23) and the two are fixed; The first adjustment assembly further comprises a limiting assembly (4), and the limiting assembly (4) is used to fix the driving roller (31).

3. The production equipment for coated core yarn according to claim 2, characterized in that: The limiting assembly (4) includes a ratchet (41) and two pawls (42). The ratchet (41) is sleeved on the driving roller (31) and the two are fixed to each other. The two pawls (42) are respectively arranged on both sides of the ratchet (41). The two pawls (42) are both snap-fitted with the ratchet (41), and the pawls (42) are rotatably connected to the base (112).

4. The production equipment for coated core yarn according to claim 1, characterized in that: A driving cavity (122) is provided in the lower wire passing seat (12), and through grooves (123) are provided on both sides of the lower wire passing seat (12) for connecting the driving cavity (122) with the outside world; The second diameter-changing assembly (5) comprises a lower adjustment plate (51) and a lower adjustment rod (52); the number of the lower adjustment rods (52), the lower adjustment plate (51) and the through slot (123) are the same and correspond one to one; the two lower adjustment plates (51) are axially symmetrically arranged; the lower adjustment rod (52) is arranged in the driving cavity (122); one end of the lower adjustment rod (52) extends from the through slot (123) and is fixed to the lower adjustment plate (51); The second driving assembly (6) is used to move the position of the lower adjusting rod (52).

5. The production equipment for covered core yarn according to claim 4, characterized in that: The second drive assembly (6) includes a fixed plate (61), a drive sleeve (62) and a drive shaft (63). The fixed plate (61) is fixed in the drive cavity (122) of the lower wire seat (12). The drive sleeve (62) passes through the fixed plate (61) and the two are rotatably connected. A driven bevel gear (621) is sleeved on the drive sleeve (62) and the two are fixed to each other. Both ends of the drive sleeve (62) are provided with threads. The two sections of the thread of the drive sleeve (62) rotate in opposite directions. The two lower adjustment rods One end of the drive sleeve (52) close to the drive sleeve (62) is inserted into the drive sleeve (62), the lower adjustment rod (52) is threadedly connected to the drive sleeve (62), the drive shaft (63) is rotatably connected to the lower wire seat (12), one end of the drive shaft (63) extends to the outside, and the other end of the drive shaft (63) extends into the drive cavity (122), and the end of the drive shaft (63) extending into the drive cavity (122) is fixedly connected to the driving bevel gear (631) meshing with the driven bevel gear (621).

6. The production equipment for coated core yarn according to claim 1, characterized in that: The upper wire passing seat (11) is fixedly connected with a connecting block (113), and the lower wire passing seat (12) is provided with a connecting groove (124) which is interference-fitted with the connecting block (113).

7. A production process for a coated core yarn, using the production equipment for a coated core yarn according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Select core yarn and outer covering fiber; S2, using a roving machine to cover the sliver and roving at the roving stage, with the core yarn passing through the upper thread opening (111) and the outer covering fiber passing through the lower thread opening (121); S3. After the coating is completed, the coated core yarn is heat-treated to fix the coating structure.

8. The production process of a covered core yarn according to claim 7, characterized in that: The S2 has a sliver weight of 10.7 g / 5 m, a roving weight of 4.0 g / 10 m, and a roving twist coefficient of 140.

9. A coated core yarn of double staple fibers, produced using the process for producing a coated core yarn according to claim 7, characterized in that: The outer covering fiber and the core yarn of the coated core yarn are both short fibers, and the ratio of the outer covering fiber to the core yarn is 80-85:15-20.

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