Lamellaed wire process of a multi-doffer card

Abstract

This invention discloses a multi-layer web extrusion process for a Dodolfo carding machine, comprising a layered web formation step and a multi-layer web stacking step. On one hand, the tangential traction and normal compression of the adsorption components work synergistically to achieve stable web transmission, reducing fiber damage and defects such as clouding. Simultaneously, the diverter plate creates a gradual negative pressure, effectively preventing web rebound and drift, and avoiding fly waste accumulation and contamination. On the other hand, the upper and lower fiber web layers move in the same direction and are subjected to consistent forces, ensuring stacking quality and making it suitable for high-speed and high-efficiency multi-layer web extrusion.

Description

Technical Field

[0001] This invention belongs to the field of carding machine technology, specifically relating to a multi-doff carding machine's layered wire output process. Background Technology

[0002] A carding machine is a textile machinery used to process fibers. Its working principle is to open and remove impurities from pre-processed fiber raw materials, and to card block fibers into bundles and single fibers to form a thin layer of mesh fibers.

[0003] Currently, for multi-doffer carding, after the fibers pass through the cylinder carding, they are arranged in multiple carding branches with upper and lower intervals. Each carding branch includes a doffer roller, a cohesive roller, a transfer roller, and an output curtain arranged in sequence. The layered fibers enter each carding branch in sequence and exit the web from the output curtain. At the same time, the multi-layered cotton web falls down and exits from the bottom output curtain to complete the entire web stacking process.

[0004] However, the following shortcomings exist in the process of organizing branch roads into a network: 1) The entire process requires at least two fiber transfers. If the fiber is fine (e.g., fine denier fiber), not only will the risk of fiber damage increase due to multiple junctions during the transfer and energy loss be high, but it will also easily cause tension fluctuations and position shifts in the web layer in the intermediate stage. This shift will macroscopically manifest as uneven thickness of the cotton web, forming cloud spots or severe unevenness, directly affecting the quality of the finished web. 2) The web exits from each branch are all stripped by negative pressure, but there is no transition between the negative pressure section and the transfer section of the output curtain. That is to say, when the negative pressure disappears instantly, the cotton web located in the transfer section will rebound or be pulled instantly. This will not only cause the accumulation and interference of the stripping process, but also increase the probability of relative drift or deviation of the cotton web, thus significantly affecting the quality and efficiency of the output web. At the same time, the cotton web may also collapse or break in some places. Therefore, the uniformity and stability of the output web are insufficient, and it cannot meet the output web requirements of the carding machine at high speed. Moreover, during high-speed operation, the detached short fibers and dust are easy to accumulate in these dead corners, forming hard lumps. These hard lumps will periodically damage the surface of the cotton web, causing periodic defects. At the same time, the accumulated fly ash may fall off and mix back into the cotton web, reducing the utilization rate of raw materials and contaminating the product. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an improved multi-layer wire drawing process for a multi-doff carding machine.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A multi-layered screen output process for a multi-dough carding machine employs multiple layered screen output structures. Each layered screen output structure includes a doffer roller, a cohesive roller, a screen output roller, an output curtain, and a negative pressure adsorption unit. The input end of the output curtain is sleeved on the outer periphery of the screen output roller. The screen output roller is a hollow negative pressure roller with adsorption holes formed circumferentially. The negative pressure adsorption unit includes a first adsorption component that forms a negative pressure cavity along the width direction of the output curtain with the input end and the screen output roller, and the adsorption port is directly opposite the negative pressure roller. A second adsorption component has its adsorption port attached to the lower outer wall of the input end and communicates with the negative pressure cavity. A diverter plate is located inside the negative pressure cavity and supported on the upper inner wall of the input end. The through-path directions of the adsorption port and the adsorption inlet intersect. Multiple diverter holes are formed on the diverter plate, and the diameter of the multiple diverter holes gradually decreases along the upper transmission direction of the input end. The multi-layered screen output process includes the following steps: S1. Layered network The fibers output from the cylinder enter the layered web structure and are copolymerized by the doffer roller and the coagulating roller. Then the copolymerized fibers are transferred to the web inlet end, and the first and second adsorption components cooperate to form negative pressure stripping force through different directions through the web inlet end and pressure adhesion force to keep the fiber web layer attached to the web inlet end. The negative pressure stripping force is used for fiber peeling, and the pressure adhesion force cooperates in peeling. As the fiber web layer is transported along with the flow divider area, the pressure adhesion force gradually decreases. The fiber web layer is transported to the web outlet end along the transfer section of the output curtain. S2. Layered mesh Each layer of the top-to-bottom layout of the fiber mesh structure forms a fiber mesh layer according to step S1. The output ends of the multiple layered fiber mesh structures are staggered forward from top to bottom. Each adjacent upper and lower fiber mesh layer is bonded and stacked with the same force on the lower output curtain. After multiple fiber mesh layers are stacked sequentially from top to bottom, they are output from the bottom output curtain to complete the stacking.

[0007] In short, the adsorption provided by the first adsorption component is mainly traction and guidance. After the cotton web leaves the condensing roller, it provides a clear tangential traction force pointing towards the output path. This force helps overcome the adhesion between the cotton web and the roller surface and its own inertia, initiating and guiding the cotton web to move in the correct direction. In principle, this negative pressure alone is sufficient for peeling. However, to solve the technical problems involved in the background technology, not only is a second adsorption component provided, but a diverter plate is also added. The adsorption provided by the second adsorption component is mainly compression and stabilization. After cooperating with the first adsorption component, it generates a strong normal pressure that presses the cotton web onto the exit roller. This force ensures that the cotton web remains tightly adhered during movement and will not float, shake, or detach due to centrifugal force, gravity, or airflow disturbance (i.e., the two sets of negative pressure not only enhance the normal pressure but also increase the static friction, allowing the cotton web to be more tightly adhered just before being pulled away by the exit roller). The more stable adhesion of the output curtain at the inlet end prevents the cotton web from drifting or partially remaining due to insufficient adhesion. Furthermore, the cotton web is taut at the moment of peeling, which helps maintain the integrity of the fiber structure. It also exhibits strong adaptability to high-speed operation and different cotton web weights, with a more fixed peeling point. The gradually changing negative pressure formed by the diverter plate avoids rebound or bounce caused by the sudden disappearance of negative pressure, and also reduces the impact of the sudden loss of negative pressure on the peeling of the cotton web. In addition, the use of single-cohesion followed by direct transfer of the web (single transfer), and the negative pressure formed at the web exit to assist fiber web formation, not only reduces the risk of fiber damage, but also results in small tension fluctuations and low positional deviation rates in the intermediate stages of the cotton web, solving problems such as cloudiness or severe unevenness. Furthermore, single transfer is more conducive to high-speed web exit of the carding machine, reducing the accumulation and agglomeration of short fibers and dust in these dead corners, meeting the requirements of continuity and uniformity in high-quality nonwoven fabric or yarn production. In addition, the upper and lower fiber web layers are bonded together while maintaining the same stress. Here, "same stress" refers to the magnitude and direction of the stress. In other words, when the upper and lower fiber web layers are bonded together, the upper and lower fiber web layers move in the same direction and the direction and magnitude of the stress are also the same, thus meeting the quality requirements of the fiber web layer.

[0008] Preferably, in step S1, the direction of the negative pressure adsorption force formed by the first adsorption component and the second adsorption component is perpendicular. This ensures that the resulting negative pressure adsorption force can achieve the desired stripping and combing more comprehensively and from multiple angles.

[0009] According to one preferred embodiment of the present invention, in step S1, the first adsorption assembly includes a first square tube with its top and / or bottom surfaces supported on the inner wall of the output curtain, first end heads formed at both ends of the first square tube and protruding outwards from the outer side of the output curtain, and a first negative pressure pump. The two first end heads are connected to the suction port of the first negative pressure pump via pipelines, and an adsorption port is formed on the end face of the first square tube facing the output roller. Based on the simultaneous suction from both ends to form a negative pressure, excessive frictional resistance is avoided due to the excessively long flow path inside the first square tube, thus preventing uneven distribution of negative pressure along the axial direction of the square tube (or insufficient suction at the distal end).

[0010] In some specific embodiments, the first square tube is supported from the top surface on the inner wall of the upper section of the output curtain, and the diverter plate is fixed to the adsorption end face of the first square tube and flush with the top surface of the first square tube. The first adsorption assembly also includes a ventilated grid disposed on the inner wall of the lower section of the output curtain, and a baffle plate inclined downward from the adsorption end face of the first square tube and towards the output roller. The ventilated grid, the baffle plate, the adsorption end face of the first square tube, the diverter plate, and the output roller form a negative pressure cavity, and the ends of the diverter plate and the ventilated grid away from the first square tube are respectively attached to the output roller. Here, the internal support and flow equalization formed by the ventilated grid, combined with the layout of the baffle plate, are more conducive to the cooperation of the two negative pressure flows to eliminate the turbulence generated at the corner formed by the ventilated grid and the first square tube. At the same time, it can also cooperate with the second adsorption assembly to avoid the relative floating of the lower section of the inlet end in the vertical direction, providing conditions for high-speed output.

[0011] Preferably, the diverter plate and the ventilation grid are tangent to the top and bottom of the output roller, respectively. Based on this tangent layout, not only can the negative pressure cavity formed remain constant with the movement of the output roller and the input end, but it also prevents the output curtain from experiencing unexpected shaking at the input end, which could cause the fiber web to flutter, shake, or detach, directly affecting the quality of the output web.

[0012] In some specific embodiments, the second adsorption component includes a second square tube with the adsorption port facing upwards and a second negative pressure pump. The inner cavity of the second square tube is connected to the air inlet of the second negative pressure pump via a pipeline from an adjacent side of the adsorption port. A moving channel is formed between the second square tube and the breathable grid. The lower section of the inlet section is respectively attached to the second square tube and the breathable grid, and the fiber web layer is transferred through the moving channel. Based on the assistance of the moving channel, not only is the required negative pressure chamber formed, but the transfer of the output curtain is also implemented more stably. Furthermore, based on the side suction method, the shortest airflow path is used to achieve the highest local adsorption efficiency and the simplest pipeline structure. It also compensates for the insufficient end-point suction that may result from relying solely on long pipe transmission. It is particularly suitable for critical workstations requiring precise, powerful, and rapid adsorption and peeling of the cotton web, complementing the uniform coverage of the first adsorption component to jointly construct a stable and efficient outlet negative pressure system.

[0013] Preferably, the pipeline includes multiple channel tubes arranged at equal intervals on the side of the second square tube. The second adsorption component also includes a third third tube arranged parallel to the second square tube and second end caps formed at both ends of the third third tube. The third third tube has connecting tubes on its side facing the second square tube, corresponding one-to-one with the channel tubes. The suction port of the second negative pressure pump is connected to the two second end caps through the pipeline. Based on the lateral connection and end suction of the third third tube, a short-path, low-resistance, and balanced high-efficiency negative pressure collection structure is constructed. Specifically, the short-path advantage brought by the channel tubes / connecting tubes (similar to the high efficiency of side suction); the uniformity advantage brought by the double-end connection (eliminating end suction attenuation); and the spatial flexibility brought by the parallel layout, that is, without increasing the cost of complex pipelines, the second adsorption component can provide stable, uniform, and strong adsorption force across the entire width of the cotton web, just like the first adsorption component, perfectly supporting the precise peeling and smooth transmission of the cotton web.

[0014] According to another specific embodiment and preferred aspect of the present invention, the ventilating holes formed on the ventilating grid are arrayed uniform flow holes. The uniform flow here not only cooperates with the first negative pressure adsorption force to complete the required negative pressure stripping force and adhesion force, but also more effectively realizes that the upper end of the inlet end of the network gradually decreases (here, it should be explained that this is segment by segment, that is, each group of flow holes corresponds to a segment of output curtain, that is, the adhesion force formed by the segment of output curtain is equal, and there is a pressure difference between the adhesion forces formed between adjacent segments. At this time, the fiber web layer gradually resets and loosens in the mode of gradually decreasing pressure difference).

[0015] According to another specific embodiment and preferred aspect of the invention, the apertures of the multiple flow-diverting holes on the flow divider plate decrease progressively in an arithmetic progression, wherein the multiple flow-diverting holes in each segment are evenly spaced along the width of the flow divider plate. By implementing a gradual elimination of negative pressure based on the arithmetic progression while maintaining a constant pressure difference, the location where negative pressure is lost is not only relatively far from the web stripping point, but also the rebound or bounce of the fiber web layer caused by the instantaneous disappearance of negative pressure is avoided.

[0016] According to another specific embodiment and preferred aspect of the present invention, the adsorption holes used in the adsorption ports and adsorption inlets are all elongated holes extending along the length direction of the output roller, and are arranged side by side and staggered or in an array. The adsorption holes are designed as elongated holes, and the direction of extension is limited. This is mainly to transform discrete point-like suction force into continuous linear / area-like suction force. This design directly solves the problems of unevenness in the transverse direction of the cotton web, edge drift, and large airflow impact caused by traditional point-like suction holes. It is also a key structural feature for achieving high-speed, high-stability, and high-quality output of the cotton web, perfectly meeting the technical requirements of gradual negative pressure and multi-directional synthetic force. At the same time, based on the spaced and staggered or arrayed layout, a relatively balanced wide coverage can be formed. As the width of the cotton web (4.2 meters or 4.6 meters or wider) increases, the peeling force and adsorption transmission traction force formed are more balanced, avoiding mutual pulling and restraint.

[0017] According to another specific embodiment and preferred aspect of the present invention, in step S1, the fiber web layer gradually resets itself under progressively decreasing adsorption force, and at the instant the negative pressure is lost, the fiber web layer is in dynamic equilibrium in the vertical direction, and maintains this dynamic equilibrium as it is transferred towards the output end along the transfer section of the output curtain. That is, a smooth transition of the fiber web layer during adsorption and transfer is achieved through force balance in the vertical direction, and the fiber web layer utilizes its own elastic recovery force and the cohesion between fibers to slowly release under gravity, while maintaining contact between the fiber web layer and the output curtain from the bottom to ensure synchronous transfer with the output curtain.

[0018] Preferably, each output curtain includes a horizontal transfer section and a downward sloping transfer section. Two output curtains spaced vertically are defined as an upper output curtain and a lower output curtain, respectively. The end of the downward sloping transfer section of the upper output curtain connects to the horizontal section of the lower output curtain. In step S2, every two fiber web layers are stacked from the horizontal transfer section or the downward sloping transfer section of the lower output curtain. Based on the positional layout of the upper and lower output curtains, the upper and lower fiber web layers are stacked under the same force, thereby improving the uniformity of the stacked web thickness.

[0019] In some specific embodiments, the upper output curtain and the lower output curtain form an upper fiber web layer and a lower fiber web layer, respectively. The exit end of the upper output curtain is located to the side and rear of the downward inclined transfer section of the lower output curtain. The upper fiber web layer exiting from the exit end of the upper output curtain adheres and overlaps with the lower fiber web layer at the downward inclined transfer section of the lower output curtain. The exit speeds of the upper and lower fiber web layers are equal, and the angle between the downward inclined transfer section of the upper output curtain and the horizontal plane is ∠1, and the angle between the downward inclined transfer section of the lower output curtain and the horizontal plane is ∠2, where ∠1 < ∠2. ∠2, and ∠2-∠1=∠A, ∠A≤15°. In short, the upper fiber mesh layer adheres to the surface of the lower fiber mesh layer while maintaining the same output direction from the outlet end. At the same time, based on the angle change formed by the lower fiber mesh layer on the upper fiber mesh layer, it not only effectively guides the movement direction of the upper fiber mesh layer sent out from the outlet end of the upper output curtain, avoiding the upper fiber mesh layer from being pulled or piled up; but also, based on the lower fiber mesh layer changing the force direction of the upper fiber mesh layer, it maintains a more closely fitted overlapping of the upper and lower fiber mesh layers under the same force conditions, thereby improving the quality of the layered overlapping.

[0020] Preferably, as the number of layers increases, ∠A also gradually increases in an arithmetic sequence, so that the resulting fiber stack can meet the requirements of uniformity.

[0021] In some specific embodiments, the Dodoff carding machine has two layered web exit structures, that is, two upper and lower fiber web layers are stacked to form a fiber web stack. Of course, the Dodoff carding machine can also adopt three or four layered web exit structures and complete the fiber web stacking according to the above web exit and stacking steps.

[0022] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: In the current multi-doff carding machine, the fiber transfer process requires at least two steps. If the fiber is fine (e.g., fine denier), not only does the transfer process involve multiple junctions, increasing the risk of fiber damage and energy loss, but it also easily causes tension fluctuations and positional shifts in the web layer during intermediate stages. This shift manifests macroscopically as uneven web thickness, forming cloudiness or severe unevenness, directly impacting the quality of the output web. Furthermore, while each branch uses negative pressure stripping, there is no transition between the negative pressure section and the transfer section of the output curtain. This means that when the negative pressure disappears instantaneously, the web in the transfer section will experience a momentary rebound or pulling, causing not only accumulation and interference during stripping but also increasing the probability of relative web drift or shift, significantly affecting the quality and efficiency of the output web. Simultaneously, the web may experience localized collapse or breakage. Therefore, the uniformity and stability of the output web are insufficient, failing to meet the requirements of high-speed carding machine operation. During high-speed operation, detached short fibers and dust easily accumulate in these dead corners, forming hard lumps. These hard lumps periodically damage the surface of the cotton web, causing periodic defects. At the same time, accumulated fly ash may fall off and mix back into the cotton web, reducing raw material utilization and contaminating the product, etc. This invention, based on the overall design of the multi-doff carding machine's layered web exit process, cleverly solves the various shortcomings of the existing technology. After adopting this layered web exit process, firstly, the fibers output from the cylinder enter the layered web exit structure and are copolymerized by the doffer roller and the cohesive roller. Then, the copolymerized fibers are transferred to the web entry end, and the first and second adsorption components cooperate to form negative pressure stripping forces in different directions through the web entry end and a pressing force to keep the fiber web layer adhered to the web entry end. The negative pressure stripping force is used for fiber peeling, and the pressing force cooperates in peeling. As the fiber web layer is transported along with the flow divider area, the pressing force gradually decreases. The fiber web layer is transported to the web exit end along with the transfer section of the output curtain.Secondly, the layered web-exit structures arranged from top to bottom form fiber web layers according to the above-mentioned web-exit process. The web-exit ends of the output curtains of multiple layered web-exit structures are gradually staggered forward from top to bottom. Each adjacent upper and lower fiber web layer maintains the same force on the lower output curtain, and the multiple fiber web layers are stacked sequentially from top to bottom before exiting from the bottom output curtain to complete the stacking. Therefore, this invention, on the one hand, constructs a dual guarantee mechanism of tangential traction and normal compression based on the traction guidance and stable pressing cooperation of the first and second adsorption components in the layered web-exit process. This not only uses negative pressure to overcome adhesion and guide the cotton web to move along the correct path, but also ensures that the cotton web remains tightly attached to the web-exit roller under high-speed operation due to normal pressure, effectively preventing floating, shaking, or retention before peeling. Simultaneously, the single-transfer method significantly reduces [the impact of the process]. This reduces the risk of fiber damage and tension fluctuations in intermediate stages, significantly decreasing quality defects such as cloudiness and unevenness, and achieving precise transmission at high speeds. Then, based on the diverter plate, a gradually decreasing negative pressure is formed, which not only solves the problems of cotton web rebound, drift, offset, pulling, and peeling interference caused by the instantaneous disappearance of negative pressure, but also eliminates the periodic accumulation of fly waste and fibers in dead corners, while also eliminating the risk of periodic pressure damage and secondary contamination of the cotton web by hard lumps. Furthermore, the bonding and stacking of the upper and lower fiber web layers under the condition that their movement directions and stress directions and magnitudes are the same not only avoids interference with the movement of the fiber web layers during web exit but also meets the quality requirements of the fiber web stacking. In addition, the web exit and stacking processes are suitable for efficient, stable, and high-quality high-speed production. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the web outlet structure of the multidoff carding machine in this embodiment; Figure 2 for Figure 1 Front view diagram; Figure 3 for Figure 1 A partial structural diagram of the layered mesh structure; Figure 4 for Figure 3 Front view diagram; Figure 5 for Figure 4 A top-down view; Figure 6 for Figure 5 Schematic diagram of the sectional view along the central AA direction; Figure 7 for Figure 3 Structural breakdown diagram (output curtain omitted); Figure 8 for Figure 7 A structural breakdown diagram (omitting the second adsorption component); Figure 9for Figure 8 A top-down view; Figure 10 for Figure 7 A structurally exploded schematic diagram of the second adsorption component; Figure 11 for Figure 8 Enlarged schematic diagram of the structure at point B; Among them: ① Upper layered netting structure; ② Lower layered netting structure; 1. Doffer roller; 2. Coagulation roller; 3. Netting roller; 30. Peeling section; 31. Adsorption section; 4. Output curtain; 40. Horizontal output section; 41. Downward inclined transfer section; 4a. Upper output curtain; 4b. Lower output curtain; 5. Negative pressure adsorption unit; 51. First adsorption component; 511. First square tube; 512. First end; x1. Adsorption port; x10, x20. Adsorption hole; 52. Second adsorption component; 522. Second square tube; 523. Third square tube; 524. Second end; t. Channel tube; s. Connecting tube; x2. Adsorption port; 53. Diverter plate; 530. Diverter hole; x3. Suction hole; 54. Breathable grid; 540. Flow equalization hole; 55. Baffle plate; 56. End sealing plate; q1. Upper fiber web layer; q2. Lower fiber web layer. Detailed Implementation

[0024] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. The orientations or positional relationships indicated by terms such as "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description. They are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0027] In this application, unless otherwise expressly specified and limited, "above" or "below" a second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of a second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" a second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intermediate element present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element present. The terms "vertical," "horizontal," "above," "below," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible embodiments.

[0028] like Figures 1 to 11 As shown, the multi-doff carding machine of this embodiment uses a multi-doff carding machine multi-layered wire extrusion system, which includes multiple layered wire extrusion structures arranged at intervals.

[0029] In this example, there are two layered netting structures (of course, there can be three or more), defined as upper layered netting structure ① and lower layered netting structure ②. The upper layered netting structure ① and the lower layered netting structure ② have the same structure and adopt the same netting method. The difference between the two lies in the netting process. Specifically, taking the upper layered netting structure as an example, the following explanation is provided.

[0030] The upper layer screen output structure ① includes a doffer roller 1, a coagulating roller 2, a screen output roller 3, an output curtain 4, and a negative pressure adsorption unit 5.

[0031] Specifically, the doffer roller 1 is connected to the discharge end of the carding machine, and the coagulation roller 2 and the doffer roller 1 form a coagulation, which bypasses the coagulation roller 2 and directly enters the web outlet. At this time, the fibers are stripped and transferred by the negative pressure adsorption unit 5 to form a cotton web and then output horizontally with the output curtain 4 to complete the entire fiber web outlet process.

[0032] In some specific embodiments, the output roller 3 is a negative pressure roller with a hollow interior and circumferentially formed adsorption holes. The output curtain 4 includes a horizontal output section 40 and a downward inclined transfer section 41. The inlet end of the horizontal output section 40 is sleeved on the outer periphery of the output roller 3, and the end of the output roller 3 that is in contact with the inlet end is divided into a peeling section 30 and the remaining part is an adsorption section 31. The negative pressure adsorption unit 5 is connected to the inner cavity of the output roller 3 and forms a peeling force through the inlet end.

[0033] In this example, the negative pressure adsorption unit 5 includes a first adsorption component 51 that forms a negative pressure cavity with the inlet end of the output curtain 4 and the outlet roller 3 and whose adsorption port is directly opposite the adsorption section 31; a second adsorption component 52 whose adsorption port is attached to the lower outer wall of the inlet end and communicates with the negative pressure cavity; a diversion plate 53 located in the negative pressure cavity and supported on the upper inner wall of the inlet end; a breathable grid 54 disposed on the inner wall of the lower section of the inlet end; and a baffle plate 55 whose adsorption end face of the first adsorption component 51 is downward and inclined toward the outlet roller. The breathable grid 54, the baffle plate 55, the adsorption end face of the first adsorption component 51, the diversion plate 53 and the outlet roller 3 form a negative pressure cavity. The end faces of the diversion plate 53 and the breathable grid 54 away from the first adsorption component 51 are respectively attached to the outlet roller 3. Here, the internal support and flow equalization formed by the ventilated grille 54, combined with the layout of the baffle plate 55, are more conducive to the cooperation of the two negative pressure flows to eliminate the turbulence generated at the corner formed by the ventilated grille 54 and the first adsorption component 51. At the same time, it can also cooperate with the second adsorption component 52 to avoid the relative floating of the lower section of the inlet end in the vertical direction, providing conditions for high-speed outlet. Meanwhile, multiple flow holes 530 are formed on the flow divider plate 53, and the aperture of the multiple flow holes 530 gradually decreases along the upper layer transmission direction of the inlet end. Based on the first and second adsorption components, The negative pressure adsorption of the auxiliary components in different directions cooperates to form the stripping force of the adsorption section 31 and the flow divider 53 to form a gradually decreasing negative pressure adsorption force through the upper layer of the inlet end. In addition, the internal support and flow equalization formed by the ventilated grille 54, together with the layout of the baffle 55, are more conducive to the cooperation of the two negative pressure flows to eliminate the turbulence generated at the corner formed by the ventilated grille 54 and the first adsorption component 51. At the same time, it can also cooperate with the second adsorption component 52 to avoid the relative floating of the lower section of the inlet end in the vertical direction, providing conditions for high-speed net exit.

[0034] In short, the adsorption provided by the first adsorption component 51 is mainly traction and guidance. After the cotton web leaves the coagulating roller, it provides a clear tangential traction force pointing towards the output path. This force helps overcome the adhesion between the cotton web and the roller surface and its own inertia, initiating and guiding the cotton web to move in the correct direction. In principle, this negative pressure alone is sufficient for peeling. However, to solve the technical problems involved in the background art, not only is a second adsorption component 52 provided, but a diverter plate 53 is also added. The adsorption provided by the second adsorption component 52 is mainly compression and stabilization. After cooperating with the first adsorption component 51, it generates a strong normal pressure that presses the cotton web onto the output roller 3. This force ensures that the cotton web remains tightly attached during movement and will not float, shake, or detach due to centrifugal force, gravity, or airflow disturbance (i.e., the two sets of negative pressure not only enhance the normal pressure but also increase the static friction, allowing the cotton web to be pulled away by the output roller at the instant). The cotton web adheres more tightly and stably to the inlet end of the output curtain, avoiding the drifting or partial retention of the cotton web due to insufficient adhesion. Moreover, the cotton web is in a taut state at the moment of peeling, which helps maintain the integrity of the fiber structure. It is also highly adaptable to high-speed operation and different weights of cotton web, and the peeling point is more fixed. The gradually changing negative pressure formed by the diverter plate avoids the rebound or bounce caused by the instantaneous disappearance of negative pressure, and also reduces the impact of the instantaneous loss of negative pressure on the peeling of the cotton web. In addition, the single-cohesion and direct transfer of the web (single transfer) and the negative pressure formed by the web exit to assist fiber web formation not only reduce the risk of fiber damage, but also reduce the tension fluctuation and positional deviation rate of the cotton web in the intermediate stage, solving the problems of cloudiness or severe unevenness. Furthermore, the single transfer is more conducive to the high-speed web exit of the carding machine, reducing the accumulation and agglomeration of short fibers and dust in these dead corners, meeting the requirements of continuity and uniformity for high-quality nonwoven fabric or yarn production.

[0035] Specifically, the first adsorption component 51 includes a first square tube 511 with its top and / or bottom surfaces supported on the inner wall of the output curtain, first end caps 512 formed at both ends of the first square tube 511 and protruding out of the outer side of the output curtain, and a first negative pressure pump. The two first end caps 512 are connected to the air intake of the first negative pressure pump through a pipeline. An adsorption port x1 is formed on the side of the first square tube 511 facing the adsorption section 31. Based on the simultaneous suction from both ends to form a negative pressure, excessive friction resistance is avoided due to the excessively long flow path of the airflow inside the first square tube 511, which would otherwise lead to uneven distribution of negative pressure along the axial direction of the square tube (or insufficient suction at the far end). The adsorption port x1 consists of multiple adsorption holes x10, and the adsorption end face formed by the multiple adsorption holes x10 covers the entire adsorption section 31. Based on the multi-pore formation of the adsorption coverage, uneven peeling force is avoided, which affects the quality of the finished web. In this example, the adsorption holes x10 are elongated holes extending along the length of the web roller 3, and are arranged side by side and staggered or in an array to form the adsorption end face. Based on the staggered or arrayed arrangement (in this example, every two rows of elongated holes are staggered and distributed in an array), a relatively balanced wide coverage can be formed. As the width of the cotton web (4.2 meters or 4.6 meters or wider) increases, the peeling force and adsorption transmission traction force formed are more balanced, avoiding mutual pulling and restraint.

[0036] The second adsorption component 52 includes a second square tube 522 with the adsorption port x2 facing upward, a second negative pressure pump, a third third tube 523 arranged parallel to the second square tube 522, and second end caps 524 formed at both ends of the third third tube 523. Channel tubes t are distributed at equal intervals on the side of the second square tube 522, and connecting tubes s are arranged on the side of the third third tube 523 facing the second square tube 522, corresponding to and connected to the channel tubes t. The air intake of the second negative pressure pump is connected to the two second end caps 524 through a pipe. Based on the lateral connection and end suction of the third-party tube 523, a short-path, low-resistance, and balanced high-efficiency negative pressure collection structure was constructed. Specifically, the short path advantage brought by the channel tube / connecting tube (similar to the high efficiency of side suction); the uniformity advantage brought by the double-end connection (eliminating the attenuation of end suction); and the spatial flexibility brought by the parallel layout, that is, without increasing the cost of complex pipelines, the second adsorption component can provide stable, uniform, and strong adsorption force across the entire width of the cotton web, just like the first adsorption component, perfectly supporting the precise peeling and smooth transmission of the cotton web. In addition, based on the side suction method, the shortest airflow path is used to achieve the highest local adsorption efficiency and the simplest pipeline structure. It also makes up for the problem of insufficient end suction that may result from relying solely on long tube transmission. It is particularly suitable for critical workstations that require precise, strong, and rapid adsorption and peeling of the cotton web. It complements the uniform coverage of the first adsorption component and together they construct a stable and efficient negative pressure system for web exit.

[0037] In this example, the adsorption port x2 of the second square tube 522 faces the diversion plate 53 and is located between the adsorption section 31 and the adsorption port x1. Furthermore, the penetration directions of the adsorption port x1 and the adsorption port x2 are perpendicular. Based on the positional layout of the adsorption port x2 and the planned adsorption direction, the adsorption direction formed by the second adsorption component 52 and the adsorption direction formed by the first adsorption component 51 can be effectively combined. This not only strengthens the stripping and transfer force formed by the stripping section in multiple directions but also effectively covers the negative pressure cavity, maintaining the forward transmission of the cotton web under the gradually decreasing negative pressure adsorption formed by the diversion plate. The adsorption port x2 consists of multiple adsorption holes x20, and the adsorption area formed by the multiple adsorption holes x20 covers the area between the adsorption section 31 and the adsorption port x1. The relatively uniform suction force formed by this coverage is more conducive to achieving a gradual decrease in the negative pressure adsorption force formed through the upper layer at the web entry end. Furthermore, the adsorption holes x20 are elongated holes extending along the length of the output roller, and are arranged side-by-side and staggered or in an array to form adsorption end faces (in this example, a side-by-side and staggered arrangement is used). The design here uses elongated holes, and the direction of extension is limited. Its main purpose is to transform discrete point-like suction force into continuous linear / area-like suction force. This design directly solves the problems of unevenness in the transverse direction of the cotton web, edge drift, and large airflow impact caused by traditional point-like suction holes. It is also a key structural feature for achieving high-speed, high-stability, and high-quality output of the cotton web, perfectly meeting the technical requirements of gradual negative pressure and multi-directional combined force.

[0038] In some specific embodiments, one end of the diversion plate 53 is fixedly connected to the top of the adsorption end face of the first square tube 511, and the other end is attached to the top of the adsorption section 31; each group of diversion holes 530 is composed of multiple suction holes x3 with the same aperture, and the multiple suction holes x3 are spaced apart along the width direction of the diversion plate 53. Here, based on the multiple group of diversion holes 530 with the same aperture and equal spacing, the corresponding sections maintain the same negative pressure, avoiding adsorption and pulling between adjacent groups or adjacent two diversion holes 530, and improving the quality of the output web; at the same time, the diversion plate 53 and the ventilated grid 54 are tangent to the top and bottom of the output roller 3, respectively. Based on the tangent layout, not only can the negative pressure cavity formed remain unchanged with the movement of the output roller and the input end, but it also prevents the output curtain input end from generating unexpected vibrations that could cause the fiber web layer to flutter, shake, or detach, directly affecting the quality of the output web. A flow equalization hole 540 is formed on the breathable grid 54, and one end of the breathable grid 54 is fixedly connected to the bottom of the adsorption end face of the first square tube 511, while the other end is attached to the bottom of the adsorption section 31. The adsorption section 31, the diverting plate 53, the breathable grid 54, the adsorption end face of the first square tube 511, and the end sealing plate 56 constitute a closed negative pressure cavity. The lower layer of the inlet end passes through the breathable grid 54 and the second square tube 522. The diverting plate 53 and the breathable grid 54 not only constitute part of the negative pressure cavity but also provide relative support to the inner walls of the upper and lower layers of the inlet end, thereby significantly reducing the shaking of the upper and lower layers of the inlet end (not affected by changes in negative pressure); on the other hand, the diverting plate at the top achieves a gradually decreasing adsorption force, so that the cotton web gradually loosens and becomes fluffy, avoiding the cotton web rebound or bounce caused by the sudden disappearance of negative pressure.

[0039] In this example, the ventilation holes formed on the ventilation grid 54 are arrayed uniform flow holes 540. This uniform flow not only works in conjunction with the first negative pressure adsorption force to achieve the required negative pressure stripping and adhesion forces, but also more effectively achieves a gradual decrease in the upper adhesion force at the inlet end (here, it needs to be explained that this is gradual, meaning each group of flow holes corresponds to a segment of the output curtain; that is, the adhesion force formed by this segment of the output curtain is equal, and there is a pressure difference between adjacent segments. At this time, the fiber web gradually resets and loosens as the pressure difference gradually decreases). The apertures of the multiple flow holes 530 on the diverter plate 53 decrease gradually in an arithmetic sequence, with multiple flow holes 530 in each segment evenly spaced along the width of the diverter plate 53. Based on the arithmetic sequence maintaining a constant pressure difference while implementing gradual elimination of negative pressure, not only will the position where negative pressure is lost be relatively far from the outlet stripping point, but the fiber web layer's rebound or bounce caused by the instantaneous disappearance of negative pressure will also be avoided. The first square tube 511 is supported from the top surface on the inner wall of the upper layer of the output curtain 4, and the diverter plate 53 is fixedly connected to the top of the first square tube 511. The bottom of the first square tube 511 is supported on the inner wall of the lower layer of the output curtain 4 based on the frame, and the first square tube 511 is fixedly connected to the ventilation grille 54 based on the baffle plate 55. The ventilation grille 54, the baffle plate 55, the adsorption section 31, the diverter plate 53, and the adsorption end face of the first square tube 511 constitute a negative pressure cavity. This structural layout not only effectively supports the output curtain internally, but also facilitates the formation of the negative pressure cavity, while reducing the inner volume of the first square tube 511. Furthermore, with the baffle plate 55 extending and connecting at an angle, it is more conducive to the cooperation of the two negative pressure flows, and also avoids turbulence at the corners.

[0040] In some specific embodiments, the upper layer netting structure ① and the lower layer netting structure ② are arranged alternately, and the two output curtains 4 are defined as the upper output curtain 4a and the lower output curtain 4b, respectively. The end of the downward inclined transfer section 41 of the upper output curtain 4a is connected to the downward inclined transfer section 41 of the lower output curtain 4b.

[0041] That is, the upper output curtain 4a and the lower output curtain 4b form an upper fiber web layer q1 and a lower fiber web layer q2, respectively. The exit end of the upper output curtain 4a is located to the side and rear of the downward inclined transfer section 41 of the lower output curtain 4b. The upper fiber web layer q1 exiting from the exit end of the upper output curtain 4a is bonded and overlapped with the lower fiber web layer q2 through the downward inclined transfer section 41 of the lower output curtain 4b. The exit speeds of the upper fiber web layer q1 and the lower fiber web layer q2 are equal, and the angle between the downward inclined transfer section 41 of the upper output curtain 4a and the horizontal plane is ∠1. The angle between the downward inclined transfer section 41 of the lower output curtain 4b and the horizontal plane is ∠1. The included angle is ∠2, ∠1<∠2, and ∠2-∠1=∠A, ∠A≤15°. In short, the upper fiber mesh layer q1 is attached to the surface of the lower fiber mesh layer q2 while maintaining the same output direction from the output end. At the same time, based on the angle change formed by the lower fiber mesh layer q2 and the upper fiber mesh layer q1, it not only effectively guides the movement direction of the upper fiber mesh layer sent out from the output end of the upper output curtain, avoiding the upper fiber mesh layer from being pulled or piled up; but also, based on the lower fiber mesh layer changing the force direction of the upper fiber mesh layer, it keeps the upper and lower fiber mesh layers more closely fitted under the same force conditions, thereby improving the quality of the layered mesh.

[0042] In this example, ∠1 = 31°, ∠2 = 33°, and ∠A = 2°. Furthermore, as the number of layers increases, ∠A also gradually increases in an arithmetic sequence, ensuring that the resulting fiber layers meet the requirement of uniformity.

[0043] In summary, the implementation process of this embodiment is as follows: S1. Layered network The fibers exiting from the cylinder enter the upper and lower layered wire exit structures respectively, and are then processed by each layered wire exit structure. The doffer roller and the coagulating roller form a copolymer, and then the copolymer fibers are transferred to the inlet end. The first and second adsorption components cooperate to form negative pressure peeling force in different directions through the inlet end and pressure adhesion force to keep the fiber web layer attached to the inlet end. The negative pressure peeling force is used for fiber peeling, and the pressure adhesion force cooperates in peeling. As the fiber web layer is transported to the area where the diverter plate is located, the pressure adhesion force gradually decreases and the fiber web layer gradually resets itself. At the moment when the negative pressure is lost, the fiber web layer is in dynamic equilibrium in the vertical direction and maintains dynamic equilibrium as it is transported to the outlet end with the transfer section of the output curtain. S2. Layered mesh Each layer of the top-to-bottom layout of the fiber mesh structure forms a fiber mesh layer according to step S1. The output ends of the multiple layered fiber mesh structures are staggered forward from top to bottom. Each adjacent upper and lower fiber mesh layer is bonded and stacked with the same force on the lower output curtain. After multiple fiber mesh layers are stacked sequentially from top to bottom, they are output from the bottom output curtain to complete the stacking.

[0044] In summary, after adopting this multi-layered fiber output process, firstly, the fibers output from the cylinder enter the multi-layered fiber output structure and are copolymerized by the doffer roller and the coagulating roller. Then, the copolymerized fibers are transferred to the input end, and the first and second adsorption components cooperate to form negative pressure stripping forces in different directions through the input end and pressure adhesion forces to keep the fiber web layer attached to the input end. The negative pressure stripping force is used for fiber peeling, and the pressure adhesion force cooperates in peeling. As the fiber web layer is transported along with the flow divider area, the pressure adhesion force gradually decreases. The fiber web layer is transported to the output end along with the transfer section of the output curtain. Secondly, each multi-layered fiber output structure arranged from top to bottom forms a fiber web layer according to the above fiber output process, and the output ends of the output curtains of multiple multi-layered fiber output structures gradually increase from top to bottom. The forward staggered spacing, where each adjacent upper and lower fiber web layer maintains the same force on the lower output curtain, and multiple fiber web layers are stacked sequentially from top to bottom and then output from the bottom output curtain to complete the stacking. Therefore, this invention, on the one hand, based on the traction guidance and pressure stability cooperation of the first and second adsorption components in the layered web output, constructs a dual guarantee mechanism of tangential traction and normal compression. It not only uses negative pressure to overcome adhesion force to start and guide the cotton web to move along the correct path, but also ensures that the cotton web is always tightly attached to the output roller under high-speed operation, effectively preventing floating, shaking, or retention before peeling. At the same time, the single transfer significantly reduces the risk of fiber damage and tension fluctuations in the intermediate links, and significantly reduces clouding and unevenness. Uniform quality defects are eliminated, enabling precise transmission at high speeds. A gradually decreasing negative pressure, generated by a diverter plate, not only solves problems such as cotton web rebound, drift, offset, pulling, and peeling interference caused by the instantaneous disappearance of negative pressure, but also eliminates the periodic accumulation of fly waste and fibers in dead corners. It also eliminates the risk of periodic pressure damage and secondary contamination to the cotton web from hard lumps. Furthermore, the bonding and stacking of the upper and lower fiber web layers, with identical movement directions and force magnitudes, not only avoids interference with the fiber web layer movement during exit but also meets the quality requirements for fiber web stacking. In addition, the exit and stacking processes are suitable for efficient, stable, and high-quality high-speed production. Thirdly, the negative pressure adsorption force formed by the first and second adsorption components is perpendicular in direction. This negative pressure adsorption force can achieve the required stripping and combing more comprehensively and from multiple angles. The first adsorption component forms negative pressure by simultaneously drawing air from both ends, avoiding excessive frictional resistance caused by the excessively long flow path inside the first square tube, which would lead to uneven distribution of negative pressure along the axial direction of the square tube (or insufficient suction at the far end). Then, through the internal support and flow equalization formed by the ventilated grid, and in conjunction with the layout of the baffle, it is more conducive to the cooperation of the two negative pressure flows to eliminate the turbulence generated at the corner formed by the ventilated grid and the first square tube. At the same time, it can also cooperate with the second adsorption component to avoid the relative floating of the lower section at the inlet end in the vertical direction, providing conditions for high-speed net exit.The second adsorption component, acting as an auxiliary moving channel, not only forms the necessary negative pressure chamber but also more stably facilitates the transfer of the output curtain. Based on a side-suction method, it achieves the highest local adsorption efficiency and the simplest piping structure with the shortest airflow path. Furthermore, it compensates for the insufficient end-suction force that may result from relying solely on long pipe transmission. It is particularly suitable for critical workstations requiring precise, powerful, and rapid adsorption and peeling of the cotton web. Complementing the uniform coverage of the first adsorption component, it together constructs a stable and efficient negative pressure system for web output. In addition, based on the lateral connection and end-suction of the third-party pipe, a short-path, low-resistance, and balanced high-efficiency negative pressure collection structure is constructed. Specifically, the short path advantage brought by the channel tube / connecting tube (similar to the high efficiency of side suction); the uniformity advantage brought by the double-end connection (eliminating the attenuation of suction force at the end); the spatial flexibility brought by the parallel layout, that is, without increasing the cost of complex pipelines, the second adsorption component can also provide stable, uniform and strong adsorption force across the entire width of the cotton web, just like the first adsorption component, perfectly supporting the precise peeling and smooth transmission of the cotton web; fourthly, the air holes formed on the air vent grid are arrayed uniform flow holes. The uniform flow here not only cooperates with the first negative pressure adsorption force to complete the required negative pressure peeling force and adhesion force, but also more effectively realizes the upper end adhesion force at the web entry end. The pressure gradually decreases (here, it needs to be explained that this is done segment by segment, meaning each group of flow holes corresponds to a segment of output curtain, i.e., the pressure force formed by that segment of output curtain is equal, and there is a pressure difference between adjacent segments. At this time, the fiber web gradually loosens and resets as the pressure difference gradually decreases segment by segment); the multiple flow holes on the flow divider plate have a diameter that decreases segment by segment in an arithmetic sequence relationship. The multiple flow holes in each segment are evenly spaced along the width of the flow divider plate. Based on the arithmetic sequence, the negative pressure is gradually eliminated while maintaining the same pressure difference change. This not only keeps the position where the negative pressure is lost relatively far away from the web stripping point, but also avoids the fiber web layer rebounding or bounce caused by the instantaneous disappearance of negative pressure; Fifth The adsorption holes are designed as elongated holes with limited extension directions. This is mainly to transform discrete point-like suction into continuous linear / area-like suction. This design directly solves the problems of unevenness in the cotton web, edge drift, and large airflow impact caused by traditional point-like suction holes. It is also a key structural feature for achieving high-speed, high-stability, and high-quality output of the cotton web, perfectly meeting the technical requirements of gradual negative pressure and multi-directional synthetic force. At the same time, based on the spaced, staggered, or arrayed layout, it can form a relatively balanced wide coverage. As the width of the cotton web (4.2 meters or 4.6 meters or wider) increases, the peeling force and adsorption-transfer traction force become more balanced, avoiding mutual pulling and restraint.Sixthly, the fiber web layer gradually resets itself under progressively decreasing adsorption force, and at the instant the negative pressure is lost, the fiber web layer is in dynamic equilibrium in the vertical direction, maintaining this dynamic equilibrium as it is transferred towards the output end of the output curtain. That is, the fiber web layer achieves a smooth transition during adsorption and transfer in a balanced vertical force environment. Furthermore, the fiber web layer utilizes its own elastic recovery force and inter-fiber cohesion to slowly release under gravity, while maintaining contact with the output curtain from the bottom to ensure synchronous transfer. Eighthly, the upper fiber web layer remains attached to the surface of the lower fiber web layer, maintaining its output direction from the output end. Simultaneously, based on the angle change formed by the lower fiber web layer on top of the upper fiber web layer, it not only effectively… The movement direction of the upper fiber web layer, which is fed from the top of the output curtain, is guided to avoid pulling or piling up of the upper fiber web layer. Furthermore, the force direction of the upper fiber web layer is changed based on the lower fiber web layer, maintaining a closer fit between the upper and lower fiber web layers under the same stress conditions, thereby improving the quality of the layered web. Ninthly, as the number of web layers increases, ∠A also gradually increases in an arithmetic sequence, ensuring that the resulting fiber web meets the requirement of uniformity. Tenthly, the multi-doff carding machine has two layered output structures, that is, two upper and lower fiber web layers are stacked to form a fiber web layer. Of course, the multi-doff carding machine can also use three or four layered output structures, and complete the fiber web stacking according to the above output and stacking steps.

[0045] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A multi-layered screen output process for a multi-dough carding machine, comprising multiple layered screen output structures, each layered screen output structure including a doffer roller, a cohesive roller, an output roller, an output curtain, and a negative pressure adsorption unit, wherein the input end of the output curtain is sleeved on the outer periphery of the output roller, the output roller is a hollow negative pressure roller with circumferentially formed adsorption holes, and each layered screen output is conveyed from the input end of the output curtain to the output end of the output curtain, characterized in that... The negative pressure adsorption unit includes a first adsorption component that forms a negative pressure cavity along the width direction of the output screen with the inlet and outlet rollers, with the adsorption port facing the negative pressure roller; a second adsorption component that has its adsorption port attached to the lower outer wall of the inlet and communicates with the negative pressure cavity; and a diversion plate located inside the negative pressure cavity and supported on the upper inner wall of the inlet. The through directions of the adsorption port and the adsorption inlet intersect. Multiple diversion holes are formed on the diversion plate, and the aperture of the multiple diversion holes gradually decreases along the upper transmission direction of the inlet. The laminated screen output process includes the following steps: S1. Layered network The fibers output from the cylinder enter the layered web structure and are copolymerized by the doffer roller and the coagulating roller. Then the copolymerized fibers are transferred to the web inlet end, and the first and second adsorption components cooperate to form negative pressure stripping force through different directions through the web inlet end and pressure adhesion force to keep the fiber web layer attached to the web inlet end. The negative pressure stripping force is used for fiber peeling, and the pressure adhesion force cooperates in peeling. As the fiber web layer is transported along with the flow divider area, the pressure adhesion force gradually decreases. The fiber web layer is transported to the web outlet end along the transfer section of the output curtain. S2. Layered mesh Each layer of the top-to-bottom layout of the fiber mesh structure forms a fiber mesh layer according to step S1. The output ends of the multiple layered fiber mesh structures are staggered forward from top to bottom. Each adjacent upper and lower fiber mesh layer is bonded and stacked with the same force on the lower output curtain. After multiple fiber mesh layers are stacked sequentially from top to bottom, they are output from the bottom output curtain to complete the stacking.

2. The multi-layer wire sheet output process of the multi-doff carding machine according to claim 1, characterized in that, In step S1, the direction of the negative pressure adsorption force formed by the first adsorption component and the second adsorption component is perpendicular.

3. The multi-layer wire feeding process of the multi-doff carding machine according to claim 1, characterized in that, In step S1, the first adsorption component includes a first square tube with its top and / or bottom surfaces supported on the inner wall of the output curtain, first ends formed at both ends of the first square tube and protruding out of the outer side of the output curtain, and a first negative pressure pump. The two first ends are connected to the air inlet of the first negative pressure pump through a pipeline, and an adsorption port is formed on the end face of the first square tube facing the output roller.

4. The multi-layer wire sheet output process of the multi-doff carding machine according to claim 3, characterized in that, The first square tube is supported on the inner wall of the upper section of the output curtain from the top surface. The diverter plate is fixed on the adsorption end face of the first square tube and is flush with the top surface of the first square tube. The first adsorption assembly also includes a ventilating grid disposed on the inner wall of the lower section of the output curtain and a baffle plate that is inclined downward from the adsorption end face of the first square tube and toward the output roller. The ventilating grid, the baffle plate, the adsorption end face of the first square tube, the diverter plate and the output roller form a negative pressure cavity. The ends of the diverter plate and the ventilating grid away from the first square tube are respectively attached to the output roller.

5. The multi-layer wire sheet output process of the multi-doff carding machine according to claim 4, characterized in that, The diverter plate and the ventilation grid are tangent to the top and bottom of the output roller, respectively.

6. The multi-layer wire feeding process of the multi-doff carding machine according to claim 4, characterized in that, The second adsorption component includes a second square tube with the adsorption port facing upward and a second negative pressure pump. The inner cavity of the second square tube is connected to the air intake of the second negative pressure pump through a pipeline from the adjacent side of the adsorption port. A moving channel is formed between the second square tube and the air-permeable grid. The lower section of the mesh entry section is attached to the second square tube and the air-permeable grid respectively and moves and transfers the fiber mesh layer in the moving channel.

7. The multi-layer wire sheet output process of the multi-doff carding machine according to claim 6, characterized in that, The pipeline includes multiple channel tubes arranged at equal intervals on the side of the second square tube. The second adsorption component also includes a third third tube arranged parallel to the second square tube and second end heads formed at both ends of the third third tube. The side of the third third tube facing the second square tube has connecting tubes that correspond one-to-one with the channel tubes. The air intake of the second negative pressure pump is connected to the two second end heads through the pipeline.

8. The multi-layer wire sheet output process of the multi-doff carding machine according to claim 4, characterized in that, The ventilation holes formed on the ventilation grille are arrayed flow equalization holes; and / or, the diameters of the multiple flow holes on the flow divider plate decrease segment by segment in an arithmetic sequence relationship, wherein the multiple flow holes in each segment are evenly spaced in the width direction of the flow divider plate.

9. The multi-layer wire sheet output process of the multi-doff carding machine according to claim 1, characterized in that, The adsorption ports and adsorption inlets are all elongated holes that extend along the length of the screen roller, and are arranged side by side or staggered, or in an array.

10. The multi-layer wire sheet output process of the multi-doff carding machine according to claim 1, characterized in that, In step S1, the fiber mesh layer gradually resets itself under the gradually decreasing adsorption force, and at the moment the negative pressure is lost, the fiber mesh layer is in dynamic equilibrium in the vertical direction, and maintains dynamic equilibrium as it is transferred to the output end of the output curtain.

11. The multi-layer wire sheet output process of the multi-doff carding machine according to claim 1, characterized in that, Each output curtain includes a horizontal transfer section and a downward sloping transfer section. Two output curtains arranged at intervals are defined as the upper output curtain and the lower output curtain, respectively. The end of the downward sloping transfer section of the upper output curtain is connected to the horizontal section of the lower output curtain. In step S2, every two fiber mesh layers are stacked from the horizontal transfer section or the downward sloping transfer section of the lower output curtain.

12. The multi-layer wire drawing process of the multi-doff carding machine according to claim 11, characterized in that, The upper and lower output curtains form an upper fiber web layer and a lower fiber web layer, respectively. The exit end of the upper output curtain is located to the side and rear of the downward inclined transfer section of the lower output curtain. The upper fiber web layer exiting from the exit end of the upper output curtain adheres to and overlaps with the lower fiber web layer at the downward inclined transfer section of the lower output curtain. The exit speeds of the upper and lower fiber web layers are equal. The angle between the downward inclined transfer section of the upper output curtain and the horizontal plane is ∠1, and the angle between the downward inclined transfer section of the lower output curtain and the horizontal plane is ∠2, ∠1 < ∠2, and ∠2 - ∠1 = ∠A, ∠A ≤ 15°.

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