Draw frame drafting device

Abstract

The present invention relates to the technical field of textile equipment, and more specifically, to a drawing frame drafting device, comprising: a roller assembly, comprising: a front roller, a middle roller, and a back roller; a top roller assembly, comprising: a first top roller, a second top roller, and a third top roller, wherein the first top roller is configured to abut against the front roller, the second top roller is configured to abut against the middle roller, and the third top roller is configured to abut against the back roller to clamp the sliver, with a drafting zone formed between the front roller and the back roller; and a buffer assembly, disposed in the drafting zone and connected to the middle roller, configured to tension the sliver, wherein the ratio of the surface speed of the buffer assembly to the surface speed at the back roller is 1.005 to 1.04:1. The buffer assembly only tensions the sliver, preventing relative slippage of fibers in the sliver between the buffer assembly and the back roller. This allows fibers in the sliver with length differences of 5 to 10 times to be well controlled, thereby improving spinning quality.

Description

Technical Field

[0001] The present invention relates to the technical field of textile equipment, and more particularly to a drawing frame drafting device. Background Art

[0002] In the spinning process, drawing frames are widely used to combine and draft multiple slivers to improve the uniformity of the sliver, the straightness and parallelism of the fibers within the sliver, and to evenly blend fibers of different qualities within the sliver. Currently, existing drawing frame drafting mechanisms typically consist of multiple rollers: front, middle, and back rollers. The rotation of these rollers provides the drafting power. The area between the front and middle rollers is the front drafting zone, while the area between the middle and back rollers is the back drafting zone. A pressure bar is located within the front drafting zone. During operation, the surface linear speeds of the back, middle, and front rollers increase sequentially. The surface speed of the middle roller is typically set between 1.1 and 2 times that of the back roller. Since slivers are composed of multiple fibers, this speed difference is sufficient to cause relative slippage between the fibers. The front roller has a higher surface speed than the middle roller and performs the primary drafting work in the draw frame. The ratio of the front roller's surface speed to the middle roller's surface speed is called the main drafting zone drafting multiple. Within the same drafting zone, fibers held by the roller with the faster surface speed are fast fibers, those held by the roller with the slower surface speed are slow fibers, and fibers whose ends are not held by either roller are called floating fibers. If both ends of a fiber are held by both left and right rollers simultaneously, two situations may occur: one is that the fiber is pulled apart, causing damage; the other is that the fiber follows the movement of the roller with greater control force, disrupting the relative parallelism of the surrounding fibers. Therefore, it is important to avoid situations where both ends of a fiber are held by both left and right rollers simultaneously. In the prior art, a pressure bar is placed on the middle roller. Multiple slivers enter the drafting device from the right side of the rear roller. After being stretched in the rear drafting zone, they form a sliver web with relatively high fiber parallelism. When the web enters the front drafting zone, it is first controlled by a pressure bar positioned near the middle roller, causing the tip of each fiber to shift speed as it approaches the front roller. The web is then further stretched by the front roller. Because fibers used for spinning vary in length, the pressure bar is again positioned near the middle roller. Therefore, when spinning fibers with widely varying lengths, the pressure bar in the front drafting zone can only control the longer fibers. Its control over shorter fibers is weaker. If fiber lengths vary significantly, the pressure bar loses its ability to control shorter fibers. This is especially true when spinning fibers with lengths varying by 5 to 10 times, as the pressure bar can only control the longest fibers and has no control over the rest. This is highly detrimental to yarn quality.

[0003] Therefore, it is necessary to propose a drawing frame drafting device to at least partially solve the problems existing in the prior art. Summary of the Invention

[0004] The Summary of the Invention introduces a series of simplified concepts that will be further described in the Detailed Description of the Invention. The Summary of the Invention is not intended to limit the key features and essential features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0006] To this end, the present invention provides a drawing frame drafting device.

[0007] In view of this, according to an embodiment of the present application, a drawing frame drafting device is proposed, comprising:

[0008] Roller assembly, the roller assembly includes: front roller, middle roller and back roller;

[0009] A top roller assembly, the top roller assembly comprising: a first top roller, a second top roller, and a third top roller, wherein the first top roller is used to abut against the front roller, the second top roller is used to abut against the middle roller, and the third top roller is used to abut against the back roller to clamp the sliver, and a drafting zone is formed between the front roller and the back roller;

[0010] A buffer assembly is arranged in the above-mentioned stretching zone and connected to the above-mentioned middle roller. The above-mentioned buffer assembly is used to control the above-mentioned cotton strip entering the above-mentioned stretching zone. The ratio of the surface speed of the buffer assembly to the surface speed at the rear roller is 1.005 to 1.04:1.

[0011] In a feasible embodiment, the buffer assembly includes:

[0012] A first apron assembly is sleeved on the middle roller;

[0013] A second apron assembly is sleeved on the second roller;

[0014] Wherein, when the middle roller abuts against the second top roller, the first apron assembly and the second apron assembly jointly control the cotton strip entering the drafting zone.

[0015] In a feasible embodiment, the first apron assembly includes:

[0016] A first apron is mounted on the middle roller;

[0017] an arc-shaped support plate, disposed in the drafting zone near the front roller, with an arc-shaped protrusion of the arc-shaped support plate facing the second apron assembly, and the first apron abutting against the arc-shaped support plate;

[0018] A first tensioning rod is provided below the drafting zone, and the first apron abuts against the first tensioning rod;

[0019] The first tensioning rod is used to tighten the first leather ring so that a portion of the first leather ring fits against the arc-shaped surface of the arc-shaped support plate.

[0020] In a feasible embodiment, the second apron assembly includes:

[0021] A second leather ring is sleeved on the second leather roller;

[0022] A support rod is provided in the drafting area close to the front roller, and the second apron abuts against the support rod;

[0023] The second tensioning rod is arranged above the drafting area, and the second apron is in contact with the second tensioning rod.

[0024] In a feasible embodiment, a notch is formed in the middle section of the support rod, and the notch faces the arc-shaped support plate;

[0025] The diameter of the middle section of the middle roller is smaller than the diameters of the two ends of the middle roller.

[0026] In a feasible embodiment, the above-mentioned drawing frame drafting device further includes:

[0027] The compacting roller assembly is used to compact the cotton strips delivered from the front roller.

[0028] In a feasible embodiment, the above-mentioned pressing roller assembly includes:

[0029] First pressing roller;

[0030] The second pressing roller is used for contacting the first pressing roller to clamp the cotton strip.

[0031] In a feasible embodiment, the above-mentioned drawing frame drafting device further includes:

[0032] The bundling and compression assembly is located between the compacting roller assembly and the front roller, and is used to organize the cotton strips sent out from the front roller.

[0033] In a feasible embodiment, the above-mentioned cluster compression component includes:

[0034] Buncher;

[0035] The bell mouth is connected to the above-mentioned bundler.

[0036] In a feasible embodiment, the above-mentioned drawing frame drafting device further includes:

[0037] The guide roller is located between the clustering device and the first roller and is used for contacting the front roller.

[0038] Compared to the prior art, the present invention has at least the following advantages: The drawing frame drafting device provided in the embodiment of the present application is provided with a roller assembly, a top roller assembly, and a buffer assembly. The roller assembly includes a front roller, a middle roller, and a back roller, all of which are capable of active rotation. The top roller assembly includes a first top roller, a second top roller, and a third top roller. The first top roller can abut against the front roller, driving the first top roller to rotate via the front roller; the second top roller can abut against the middle roller, driving the second top roller to rotate via the middle roller; and the third top roller can abut against the back roller, driving the third top roller to rotate via the back roller, thereby clamping and conveying the cotton sliver. A drafting zone is formed between the front and back rollers, effectively thinning the cotton sliver. The buffer assembly is arranged in the drafting zone, and part of the buffer assembly is connected to the middle roller. The buffer assembly can control the sliver entering the drafting zone, and the surface speed ratio of the buffer assembly and the surface speed of the rear roller is 1.005 to 1.04:1, so that the surface speed of the buffer assembly is only slightly faster than the surface speed of the rear roller. While tightening the sliver, it avoids the relative sliding of the fibers in the sliver between the buffer assembly and the rear roller, so that the fibers in the sliver with a length difference of 5 to 10 times can be well controlled, thereby improving the spinning quality.

[0039] The drawing frame drafting device provided by the present invention, and other advantages, objectives and features of the present invention will be reflected in part through the following description, and will also be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present description. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0041] Figure 1 A schematic structural diagram of a drawing frame drafting device provided in an embodiment of the present application;

[0042] Figure 2 A schematic diagram of the partial structure of a drawing frame drafting device provided in an embodiment of the present application.

[0043] in, Figure 1 and Figure 2The corresponding relationship between the reference numerals and component names is as follows:

[0044] 1 front roller, 2 middle roller, 3 back roller, 4 guide roller, 5 first roller, 6 second roller, 7 third roller, 9 buncher, 10 bell mouth, 11 first pressing roller, 12 second pressing roller, 21 curved support plate, 22 first apron, 23 second apron, 24 support rod, 241 notch, 25 second tensioning rod, 26 first tensioning rod, FB sponge. DETAILED DESCRIPTION

[0045] In order to better understand the technical solution, the technical solution of the embodiments of the present application is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solution of the embodiments of the present application, rather than limitations on the technical solution of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0046] like Figure 1 and Figure 2 As shown, according to an embodiment of the present application, a drawing frame drafting device is proposed, including: a roller assembly, the above-mentioned roller assembly includes: a front roller 1, a middle roller 2 and a rear roller 3; a leather roller assembly, the above-mentioned leather roller assembly includes: a first leather roller 5, a second leather roller 6 and a third leather roller 7, wherein the above-mentioned first leather roller 5 is used to abut against the above-mentioned front roller 1, the above-mentioned second leather roller 6 is used to abut against the above-mentioned middle roller 2, and the above-mentioned third leather roller 7 is used to abut against the above-mentioned rear roller 3 to clamp the cotton strip FB, and a drafting zone is formed between the above-mentioned front roller 1 and the above-mentioned rear roller 3; a buffer assembly, which is arranged in the above-mentioned drafting zone and is connected to the above-mentioned middle roller 2, and the above-mentioned buffer assembly is used to control the above-mentioned cotton strip FB entering the drafting zone, and the ratio of the surface speed of the above-mentioned buffer assembly to the surface speed at the above-mentioned rear roller 3 is 1.005 to 1.04:1.

[0047] It is understood that the drafting device of the draw frame provided in the embodiment of the present application is provided with a roller assembly, a top roller assembly, and a buffer assembly. The roller assembly includes a front roller 1, a middle roller 2, and a back roller 3, all of which are capable of active rotation. The top roller assembly includes a first top roller 5, a second top roller 6, and a third top roller 7. The first top roller 5 can abut against the front roller 1, driving the first top roller 5 to rotate via the front roller 1; the second top roller 6 can abut against the middle roller 2, driving the second top roller 6 to rotate via the middle roller 2; and the third top roller 7 can abut against the back roller 3, driving the third top roller 7 to rotate via the back roller 3. This allows the cotton sliver FB to be clamped and conveyed. A drafting zone is formed between the front roller 1 and the back roller 3, effectively thinning the cotton sliver FB. The buffer assembly is arranged in the drafting area, and part of the buffer assembly is connected to the middle roller 2. The buffer assembly can tighten the sliver FB, and the ratio of the surface speed of the buffer assembly to the surface speed of the rear roller 3 is 1.005 to 1.04:1, so that the surface speed of the buffer assembly is only slightly faster than the surface speed of the rear roller 3. While tightening the sliver FB, it avoids relative sliding of fibers in the sliver FB between the buffer assembly and the rear roller 3, so that fibers with a length difference of 5 to 10 times in the sliver FB can be well controlled, thereby improving the spinning quality.

[0048] It should be noted that in the draw frame drafting device provided in the embodiment of the present application, since the surface speed of the buffer assembly is only slightly faster than the surface speed of the back roller 3, the roller group consisting of the back roller 3 and the third top roller 7, and the roller group consisting of the front roller 1 and the first top roller 5, actually exert a grip on the sliver FB. The roller group consisting of the middle roller 2 and the second top roller 6 only functions to control the surface speed of the buffer assembly. Therefore, compared with the prior art, the draw frame drafting device of the present application has only one drafting zone.

[0049] It can be understood that the sliver FB fed into the drawing device of the drawing frame is composed of multiple fibers, the fiber amount is large, the total amount of fibers at each location is determined, the length ratios of the various fibers contained are basically the same, and the front roller 1, the middle roller 2 and the rear roller 3 rotate continuously, so the amount of fiber output by the front roller 1 will remain stable, and the straightness and parallelism of the fibers in the output sliver FB will also be improved.

[0050] In some examples, such as Figure 1 and Figure 2 As shown, the above-mentioned buffer assembly includes: a first leather ring 22 assembly, which is sleeved on the above-mentioned middle roller 2; a second leather ring 23 assembly, which is sleeved on the above-mentioned second leather roller 6; wherein, when the above-mentioned middle roller 2 abuts against the above-mentioned second leather roller 6, the above-mentioned first leather ring 22 assembly and the above-mentioned second leather ring 23 assembly jointly control the above-mentioned cotton strip FB.

[0051] It is understood that the buffer assembly comprises a first apron 22 assembly and a second apron 23 assembly. The first apron 22 assembly is mounted on the middle roller 2, and the second apron 23 assembly is mounted on the second roller 6. When the middle roller 2 rotates and the second roller 6 abuts the middle roller 2, the first apron 22 and the second apron 23 assembly jointly tension the sliver FB. Specifically, the surface speeds of the first apron 22 and the second apron 23 assembly are affected only by the middle roller 2 and the second roller 6, and the ratio of these speeds to the surface speed of the back roller 3 is 1.005 to 1.04:1. Consequently, the first apron 22 and the second apron 23 assembly only tension the sliver FB relative to the back roller 3, preventing relative slippage of fibers in the sliver FB between the first apron 22 and the second apron 23 assembly. This improves control reliability and enhances spinning quality.

[0052] In some examples, such as Figure 1 and Figure 2 As shown, the above-mentioned first leather ring 22 assembly includes: a first leather ring 22, which is sleeved on the above-mentioned middle roller 2; an arc-shaped support plate 21, which is arranged in the above-mentioned stretching area close to the above-mentioned front roller 1, and the arc-shaped protrusion of the above-mentioned arc-shaped support plate 21 is facing the above-mentioned second leather ring 23 assembly, and the above-mentioned first leather ring 22 abuts against the above-mentioned arc-shaped support plate 21; a first tensioning rod 26, which is arranged below the above-mentioned stretching area, and the above-mentioned first leather ring 22 abuts against the above-mentioned first tensioning rod 26; wherein, the first tensioning rod 26 is used to tighten the above-mentioned first leather ring 22 so that part of the above-mentioned first leather ring 22 fits against the arc surface of the above-mentioned arc-shaped support plate 21.

[0053] It is understood that the first apron 22 assembly comprises a first apron 22, an arc-shaped support plate 21, and a first tensioning rod 26. The first apron 22 is sleeved onto the middle roller 2. The arc-shaped support plate 21 is positioned in the drafting zone near the front roller 1, and the first apron 22 is sleeved onto the arc-shaped support plate 21, securing the first apron 22 in the drafting zone. The arc-shaped protrusion of the arc-shaped support plate 21 faces the second apron 23 assembly, and the first tensioning rod 26 is positioned below the drafting zone. The first tensioning rod 26 presses downward on the first apron 22, placing it in a tensioned state. This forces the portion of the first apron 22 located at the arc-shaped protrusion to adhere to the arc-shaped surface of the arc-shaped support plate 21, enabling the middle roller 2 to stably transmit power to the first apron 22.

[0054] In some examples, such as Figure 1 and Figure 2As shown, the second leather ring 23 assembly includes: a second leather ring 23, which is sleeved on the second leather roller 6; a support rod 24, which is arranged in the above-mentioned stretching area close to the above-mentioned front roller 1, and the second leather ring 23 abuts against the above-mentioned support rod 24; a second tensioning rod 25, which is arranged above the above-mentioned stretching area, and the second leather ring 23 abuts against the above-mentioned second tensioning rod 25.

[0055] As will be understood, the second apron 23 assembly comprises a second apron 23, a support rod 24, and a second tensioning rod 25. The second apron 23 is mounted over the second roller 6, and its position corresponds to that of the first apron 22. The support rod 24 is located in the drafting zone near the front roller 1 to stabilize the position of the second apron 23 within the drafting zone. This ensures that the sliver fiber web, which is fed between the first and second aprons 22, 23, approaches the gripping line formed by the front roller 1 and the first roller 5. The second tensioning rod 25 is located above the drafting zone. By pulling the second apron 23 upward, the second apron 23 is in a tensioned state, enabling the second roller 6 to stably transmit power to the second apron 23.

[0056] It can be understood that the arc-shaped support plate 21 acts on the first leather ring 22 to cause part of the first leather ring 22 to be deformed into an arc shape, and the arc-shaped part of the first leather ring 22 will apply the deformation to the corresponding second leather ring 23, so that the first leather ring 22 and the second leather ring 23 jointly form an arc-shaped area, and the cotton strip FB passes between the first leather ring 22 and the second leather ring 23. The arc-shaped area can become a buffer zone that can control floating fibers and does not affect the fast fibers held by the front roller 1 and the first leather roller 5 to be extracted from the fiber web of the cotton strip FB, thereby increasing the friction of the fibers wrapped in the buffer zone. The increased friction can better control the floating fibers.

[0057] It should be noted that, since the first apron 22 in the arc-shaped area applies force to the second apron 23 , the friction force on the fibers in the sliver FB in the arc-shaped area is increased, thereby achieving a better control over the floating fibers.

[0058] It should be noted that the presence of the curved buffer zone allows fibers with length differences of 5 to 10 times to be appropriately controlled at the first and second aprons 22 and 23. After escaping the grip of the rear roller 3 and the third roller 7, the fiber web of the sliver FB is enclosed by the first and second aprons 22 and 23. The first and second aprons 22 and 23 travel at a slightly faster surface speed than the rear roller 3, enclosing the fiber web of the sliver FB as it exits the rear roller 3, toward the front roller 1. Because the first and second aprons 22 and 23 only control the sliver FB, their grip is much weaker than that of the front roller 1 and first roller 5. This allows the head end of a fiber held by the front roller 1 and first roller 5 to transform into a fast-moving fiber, which is then extracted from the sliver FB in the buffer zone. During this process, other floating fibers in the sliver FB remain controlled by the first and second aprons 22 and 23, moving at the same speed as them. Therefore, the extraction of this fiber from the fiber web will not affect other fibers, thereby improving the control of the fibers in the sliver FB, increasing reliability and improving spinning quality.

[0059] Illustratively, the first apron 22 can be made of rubber with small deformation, certain thickness and elasticity, and the first apron 22 has good friction with the middle roller 2 in the tensioned state to ensure that the middle roller 2 can stably drive the first apron 22 to move.

[0060] For example, the tensioning force of the first tensioning rod 26 and the second tensioning rod 25 may be derived from a spring or a torsion spring.

[0061] In some examples, such as Figure 2 As shown, a notch 241 is formed in the middle section of the support rod 24 , and the notch 241 faces the arc-shaped support plate 21 ; the diameter of the middle section of the second roller 6 is smaller than the diameters of the two ends of the second roller 6 .

[0062] It is understood that a notch 241 is provided in the middle section of the support rod 24, and that notch 241 faces the arc-shaped support plate 21. The diameter of the middle section of the second roller 6 is smaller than the diameter of the ends of the second roller 6. This arrangement facilitates the conveyance of the sponge FB through the middle section of the second roller 6 and the notch 241 in the middle section of the support rod 24. Furthermore, because the second apron 23 is connected to both ends of the second roller 6 and the other end to the support rod 24, the transmission effect of the second roller 6 on the second apron 23 is not affected.

[0063] In some examples, such as Figure 1 As shown, the above-mentioned drawing frame drafting device also includes: a pressing roller assembly, which is used to press the above-mentioned cotton strip FB sent out from the above-mentioned front roller 1.

[0064] It is understood that the drawing frame drafting device is further provided with a compacting roller assembly, which is located on the output side of the front roller 1. The compacting roller assembly can compact the sliver FB delivered by the front roller 1. The compacted sliver FB is conveyed to the drawing frame winding device.

[0065] In some examples, such as Figure 1 As shown, the pressing roller assembly includes: a first pressing roller 11; a second pressing roller 12, which is used to abut against the first pressing roller 11 to clamp the cotton strip FB.

[0066] It is understood that the compacting rollers include a first compacting roller 11 and a second compacting roller 12. The sliver FB passes between the first compacting roller 11 and the second compacting roller 12. The force exerted by the first compacting roller 11 on the second compacting roller 12 can be adjusted to adjust the pressure exerted by the first and second compacting rollers 11 and 12 on the sliver FB, ensuring that the compaction level of the sliver FB meets conveying requirements.

[0067] In some examples, such as Figure 1 As shown, the drawing frame drafting device further includes: a bundling and compression assembly, located between the pressing roller assembly and the front roller 1, for arranging the sliver FB delivered from the front roller 1.

[0068] It can be understood that the drawing device of the drawing frame is also provided with a bunching and compression component, which is located between the compacting roller component and the front roller 1. The cotton strip FB fiber web output by the front roller 1 is sorted by the bunching and compression component to meet the output conditions.

[0069] In some examples, such as Figure 1 As shown, the above-mentioned clustering and compression assembly includes: a clustering device 9; and a bell mouth 10 connected to the above-mentioned clustering device 9.

[0070] It can be understood that the buncher 9 is located between the compacting roller assembly and the front roller 1. The fiber web of the cotton strip FB is gathered in time through the buncher 9 to form the cotton strip FB. The bell mouth 10 is connected to the buncher 9. The bell mouth 10 further compacts the cotton strip FB to reduce the accidental extension of the cotton strip FB when it comes out, improve reliability, and further reduce the possibility of defects.

[0071] In some examples, such as Figure 1 As shown, the drawing frame drafting device further includes: a guide roller 4, located between the buncher 9 and the first roller 5, for contacting the front roller 1.

[0072] It is understood that the drawing frame drafting device is further provided with a guide roller 4, which is located between the buncher 9 and the first roller 5 and can abut against the front roller 1. Through the combined action of the guide roller 4 and the front roller 1, the sliver FB is guided in the output direction of the front roller 1 so that the sliver FB enters the bunching and compression assembly.

[0073] In the description of the present invention, it should be understood that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front" and "back" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0074] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0075] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A drawing frame drafting device, characterized in that: include: A roller assembly, comprising a front roller, a middle roller and a back roller; A top roller assembly, comprising: a first top roller, a second top roller, and a third top roller, wherein the first top roller is used to abut against the front roller, the second top roller is used to abut against the middle roller, and the third top roller is used to abut against the back roller to clamp the cotton strip, and a drafting zone is formed between the front roller and the back roller; a buffer assembly, disposed in the drafting zone and connected to the middle roller, the buffer assembly being used to control the sliver entering the drafting zone, the ratio of the surface speed of the buffer assembly to the surface speed at the rear roller being 1.005 to 1.04:1; The buffer assembly comprises: A first apron assembly is sleeved on the middle roller; A second apron assembly is sleeved on the second roller; Wherein, when the middle roller abuts against the second top roller, the first apron assembly and the second apron assembly jointly control the sliver entering the drafting zone; The first apron assembly comprises: a first apron, sleeved on the middle roller; an arc-shaped support plate, disposed in the drafting zone near the front roller, wherein the arc-shaped protrusion of the arc-shaped support plate faces the second apron assembly, and the first apron abuts against the arc-shaped support plate; a first tensioning rod, disposed below the drafting zone, wherein the first apron abuts against the first tensioning rod; The first tensioning rod is used to tighten the first apron so that a portion of the first apron fits the curved surface of the curved support plate; Also includes: The compacting roller assembly is used for compacting the cotton strips delivered from the front roller.

2. The drawing frame drafting device according to claim 1, characterized in that: The second apron assembly comprises: a second leather ring, sleeved on the second leather roller; a support rod, disposed in the drafting area close to the front roller, the second apron abutting against the support rod; The second tensioning rod is arranged above the stretching area, and the second apron is in contact with the second tensioning rod.

3. The drawing frame drafting device according to claim 2, characterized in that: A notch is formed in the middle section of the support rod, and the notch faces the arc-shaped supporting plate; The diameter of the middle section of the second roller is smaller than the diameters of the two ends of the second roller.

4. The drawing frame drafting device according to claim 1, characterized in that: The compacting roller assembly comprises: First pressing roller; The second pressing roller is used for contacting the first pressing roller to clamp the cotton strip.

5. The drawing frame drafting device according to claim 1, characterized in that: Also includes: The bundling and compression assembly is located between the compacting roller assembly and the front roller, and is used to gather the cotton strips sent out from the front roller.

6. The drawing frame drafting device according to claim 5, characterized in that: The cluster compression component includes: Buncher; The bell mouth is connected to the buncher.

7. The drawing frame drafting device according to claim 6, characterized in that: Also includes: The guide roller is located between the buncher and the first roller and is used for contacting the front roller.

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