Process for the web formation of a multi-doffer card

Abstract

The application discloses a webbing process of a multi-doffer carding machine, which comprises the following steps: S1, webbing; S2, webbing transfer; S3, webbing stacking; and S4, webbing output. In one aspect, based on the cooperation of the different angles and gradual changes of the stripping force and the uniform division of the adsorption width formed by the multiple rows of slit adsorption holes, not only is the pulling of the fiber webbing caused by instantaneous adsorption eliminated, but also the problem of insufficient transfer of the condensing roller is improved, and the areas formed by the slit adsorption holes are superposed, the stress of the fiber webbing and the webbing stacking is uniform, and the webbing output quality is improved. In another aspect, based on the intersection layout of the slit adsorption holes, not only is the airflow in motion effectively blocked and dispersed to eliminate the bulging or internal and external pulling of the fiber web caused by the moving airflow, but also the fiber web is more conducive to being attached, adsorbed, transferred and stacked, and the fiber webbing, stacking and webbing output are performed in the synchronous motion with high quality.

Description

Technical Field

[0001] This invention belongs to the field of carding machine technology, specifically relating to a web-out process for a multi-doff carding machine. 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, with the increasing demand for product thickness, carding machines perform multi-doffer layered carding, and the fiber webs after each layer of carding need to be stacked layer by layer and output horizontally by a conveyor belt. However, the following technical challenges often arise during the stacking process:

[0004] 1) Because a fiber web transfer section is formed between each adjacent upper and lower condensing roller, once the fiber web transfer section floats, not only will the resulting airflow affect the transfer of the fiber web by the lower condensing roller, but it will also change the tightness of the fiber web transfer section. That is, not only will the carding force of the lower fiber web change significantly, but the fiber transfer will also be insufficient. As a result, the fiber will adhere to the doffer card cloth and be difficult to peel off, forming stagnation points, which will then develop into neps (core hazard: destroying the uniform distribution of fibers and forming dense hard lumps; end result: filter blockage / weak mechanical areas / bacterial breeding ground) and white spots (core hazard: local fiber loss, interruption of structural continuity; end result: leakage / holes / protection failure). At the same time, during the multi-layer laying process, local wrinkles will appear in the fiber web layer, resulting in uneven thickness of the final web layer, and the density and strength of the fiber web will be difficult to meet the processing requirements. That is, the fiber web quality has serious defects.

[0005] 2) Some netting exits utilize negative pressure adsorption, such as common moving negative pressure rollers. This involves adsorption through multiple adsorption points on the roller to keep the fiber net moving synchronously with the roller. Each adsorption point is a circular hole, and these holes are generally arranged in a ring array on the outer wall of the negative pressure roller. However, once the width of the exiting fiber layer is large (e.g., 3.6 meters, 4.2 meters, 4.6 meters, etc.), the negative pressure points are relatively separated, and the adsorption force between adjacent holes weakens. Therefore, this not only increases the partial warping or deformation rate of the fiber net, but also causes the fiber net to be stretched during the moment of exiting the net, resulting in a high fiber damage rate and uneven fiber stress, which seriously affects the quality of the exiting net.

[0006] 3) During the transfer of the fiber web, external airflow will also enter between the negative pressure points. If the airflow is not guided, it is highly likely that the fiber web will bulge and detach from the negative pressure roller. This will not only cause the fiber web to be stretched inside and out, but also make it impossible to form a web and stack it under the same standard. That is, it is impossible to form the required stacking quality. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a novel web-out process for a multi-doff carding machine.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] A screen exit process for a multi-dough carding machine employs multiple condensing rollers with their screen exit ends spaced apart from top to bottom and gradually shifted inward to maintain alignment and form a screen exit end face. The screen exit structure includes an annular transfer belt and a negative pressure adsorption mechanism located inside the annular transfer belt. The annular transfer belt has an adsorption transfer section that intersects with the upper extension line of the screen exit end face and whose upper and lower ends extend beyond the upper and lower ends of the screen exit end face, a screen exit transfer section that forms a stacked screen exit channel with the conveyor curtain, and a closed connecting section. The negative pressure end face formed by the negative pressure adsorption mechanism is based on the adsorption transfer section, and multiple rows of slot adsorption holes are formed on the negative pressure end face. The multiple rows of slot adsorption holes are divided into a stripping group and a transfer group. The extension directions of the slot adsorption holes in the transfer group and the stripping group intersect. The process includes the following steps:

[0010] S1, Network Formation

[0011] The stripping group faces the discharge end of the coagulation roller. Multiple rows of slotted adsorption holes are staggered vertically. Under the cooperation of the stripping force and the even distribution of the adsorption width formed by the multiple rows of slotted adsorption holes at different angles, the web formation direction and angle at the discharge end are changed. This is to form the upper fiber web in the bonding adsorption transfer section when the positive adsorption force of the bonding adsorption transfer section is reduced. The multiple rows of slotted adsorption holes are divided into pre-adsorption rows and positive adsorption rows based on the vertical direction. The pre-adsorption rows first strip the fibers on the coagulation roller to change the fiber direction from the web discharge end. The positive adsorption rows form an adsorption angle of less than 90° opposite the web discharge end, and the adsorption force formed by the positive adsorption rows is greater than that of the pre-adsorption rows.

[0012] S2, Switching Network

[0013] Based on the intersecting extension directions of the slit adsorption holes, the moving airflow is blocked and dispersed to keep the upper fiber web flat against the adsorption transfer section and move downward synchronously with it. The extension direction of the slit adsorption holes of the transfer group is the same as the extension direction of the adsorption transfer section. The extension directions of the slit adsorption holes of the transfer group and the stripping group are perpendicular. Based on the vertical layout of the slit adsorption holes, the moving airflow is intercepted and evenly distributed.

[0014] S3, Overlay mesh

[0015] The upper fiber web enters the discharge end of the next coagulation roller. Step S1 is repeated, and the stripped fibers are attached to the surface of the upper fiber web to form a stacked web. At the same time, step S2 is repeated until the web formation and stacking of all coagulation rollers are completed to form a stacked web layer.

[0016] S4, Out of Net

[0017] The stacked mesh layer adheres to the lower end of the adsorption and transfer section, and enters the stacked mesh exit channel based on the upward flipping of the upper fiber mesh. Simultaneously, with the cooperation of the conveyor curtain, the stacked mesh layer gradually detaches from the mesh exit transfer section and is output with the conveyor curtain to complete the mesh exit.

[0018] In step S1, the gradually changing adsorption force formed at different positions not only eliminates the tensile deformation caused by the adsorption moment, but also makes it more conducive to the fiber peeling off from the coagulation roller during the angle change, so as to reduce the probability of insufficient fiber transfer.

[0019] Preferably, there is at least one pre-adsorption row, and the extension direction of the slot adsorption holes in both the pre-adsorption row and the positive adsorption row is consistent with the length direction of the condensing roller. Based on adsorption with consistent width direction, lateral pulling of the fiber web caused by adsorption is avoided, maintaining synchronization between the fiber web and the adsorption transfer section, thus providing conditions for high-quality web stacking.

[0020] In some specific embodiments, the slotted adsorption holes in the pre-adsorption row and the positive adsorption row are evenly spaced, and the extension length of each row of slotted adsorption holes is greater than the interval between two adjacent slotted adsorption holes. Based on the radiation of the adsorption area formed by the slotted adsorption holes, the adsorption and tension forces formed at the adsorption positions and interval positions are kept relatively uniform. This avoids uneven force caused by adsorption and also facilitates the synchronous movement of the fiber web to adhere to the adsorption transfer section.

[0021] Preferably, both the pre-adsorption row and the positive adsorption row are single-row slit adsorption holes, which are complementary to each other. Furthermore, the upper slit adsorption hole and the lower, misaligned slit adsorption hole overlap at their ends in the vertical projection. This misalignment and the resulting end overlap not only effectively ensures even coverage of the fiber web across its width but also maintains relatively uniform fiber stress between the upper and lower layers.

[0022] In some specific embodiments, the vertical spacing between the pre-adsorption row and the positive adsorption row is M, and the slit width of each slit adsorption pore is W, where W≤M≤2W. Based on the limitations of spacing and slit width, the slit adsorption pores achieve uniform adsorption and form varying adsorption patterns, thereby improving fiber transfer efficiency and quality.

[0023] In step S2, the extension directions of the slot adsorption holes are perpendicular to each other, so that the airflow in motion is blocked and reversed, thereby reducing the stretching rate caused by the airflow causing the fiber web to bulge.

[0024] Preferably, the multiple condensing rollers are spaced apart according to the extension direction of the adsorption transfer section, wherein at least two aligned and spliced ​​transfer groups are arranged between every two adjacent condensing rollers. The spacing of the condensing rollers based on the transfer groups eliminates motion interference between the fiber webs formed by adjacent condensing rollers.

[0025] Furthermore, each condensing roller corresponds to a negative pressure chamber, and the negative pressure chamber has interconnected peeling and transfer groups, with equal negative pressure formed between the transfer groups. In step S3, a stacked web is formed during the movement based on the constant adsorption force of the upper fiber web. That is, the pressure formed by peeling and stacking is the same.

[0026] According to another specific embodiment and preferred aspect of the present invention, in step S4, the netting transfer section is inclined from bottom to top, and the stacked netting channel gradually increases in size based on the conveyor curtain. Simultaneously, the stacked netting layer at the bottom of the adsorption transfer section flips and gradually flips to transition to the stacked netting channel with the upper fiber net facing upwards. Then, based on the separation of the upper fiber netting from the netting transfer section, the conveyor curtain outputs the netting. Based on the flipping discharge method, not only is the stacked netting layer smoothly transitioned to the stacked netting channel under the flipping transfer force, avoiding the pulling of the stacked netting layer caused by the instantaneous loss of negative pressure, but the flipped stacked netting layer, based on the output formed by the stacked netting channel, lays flat on the conveyor curtain and gradually detaches from the netting transfer section, thereby completing the netting discharge.

[0027] In addition, trusses are provided on opposite sides of the conveyor curtain. The netting structure also includes tripods that move on the trusses based on their extension direction, multiple transmission rollers installed between the tripods, and an annular transfer belt fitted onto the multiple transmission rollers. The distance between the netting end face and the adsorption transfer section is adjusted based on the movement of the tripods relative to the trusses. The angle formed by the intersection of the adsorption transfer section and the top extension line of the netting end face is adjusted based on the position of the transmission rollers. Based on the adjustment of the angle and distance, the relative position settings between the netting end face and the adsorption transfer section are set under different working conditions, thereby meeting the requirements for multi-layer netting.

[0028] In some specific embodiments, the negative pressure adsorption mechanism includes multiple negative pressure chambers flattened inside the adsorption transfer section and aligned with the adsorption surfaces, a negative pressure connector connected to the negative pressure chambers, and a negative pressure source. The upper end of the adsorption end face is located between the upper end of the adsorption transfer section and the upper end of the web exit end face, and the lower end of the adsorption end face is located between the lower end of the adsorption transfer section and the lower end of the web exit end face. Multiple rows of slotted adsorption holes are formed on the adsorption surface. Using adsorption chambers not only forms the necessary internal support but also meets the adsorption force requirements for fiber web formation and fiber transfer.

[0029] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0030] In the current multi-doff carding machine, a fiber web transfer section is formed between each adjacent upper and lower condensing roller. If this transfer section becomes unstable, not only does the resulting airflow affect the transfer of the fiber web by the lower condensing roller, but it also alters the tightness of the transfer section. This results in significant variations in the carding force of the lower fiber web, and insufficient fiber transfer. Consequently, the fibers adhere to the doffer carding cloth and are difficult to remove, forming stagnation points. This can further develop into neps (core hazard: disrupting fiber distribution and forming dense, hard lumps; end consequences: filter blockage / weak mechanical zones / bacterial breeding grounds) and white spots (core hazard: localized fiber loss, structural damage). Continuity interruption; terminal consequences: leakage / holes / protection failure); Simultaneously, during multi-layer laying, local wrinkles may appear in the fiber web layer, resulting in uneven thickness of the final web layer. Furthermore, the density and strength of the fiber web are difficult to meet processing requirements, meaning the fiber web quality has serious defects. Additionally, regarding the use of negative pressure adsorption for some web exits, such as common moving negative pressure rollers, where adsorption is achieved through multiple adsorption points on the roller to keep the fiber web moving synchronously with the roller, each adsorption point is a circular hole, and these holes are generally arranged in a ring array on the outer wall of the negative pressure roller. However, once the width of the exiting fiber layer is large (e.g., 3.6 meters, 4.2 meters, 4.5 meters...),...(e.g., 6 meters), the negative pressure points are relatively separated, and the adsorption force in the area between two adjacent holes weakens. Therefore, this not only increases the partial warping or deformation rate of the fiber web, but also causes the fiber web to be stretched at the moment of exiting the web, resulting in a high fiber damage rate and uneven fiber stress, seriously affecting the quality of the finished web. In addition, during the transfer of the fiber web, external airflow will also enter between the negative pressure points. If the airflow is not guided, it is highly likely that part of the fiber web will bulge and detach from the negative pressure roller, causing not only internal and external stretching of the fiber web, but also making it impossible to form and stack the web under the same standard, that is, unable to The present invention addresses the shortcomings of existing methods, such as the lack of required layer quality. However, the overall design of the web-out process based on a multi-doff carding machine cleverly solves these deficiencies. Using this web-out process, firstly, the stripping group faces the discharge end of the coagulating roller, with multiple rows of slotted adsorption holes staggered vertically. The varying stripping forces and evenly distributed adsorption widths formed by these slotted adsorption holes change the web-forming direction and angle at the discharge end, thus forming the upper fiber web during the momentary positive adsorption force of the adsorption transfer section, which reduces the adsorption transfer section's instantaneous positive adsorption force. Secondly, the intersecting slotted adsorption holes in the extending directions trap the moving air... The flow is blocked and dispersed to keep the upper fiber web flat against the adsorption transfer section and move downwards synchronously with it; then, the above process is repeated, the upper fiber web enters the discharge end of the next condensing roller, and the peeled fibers adhere to the surface of the upper fiber web to form a stacked web, until the web formation and stacking of all condensing rollers are completed to form a stacked web layer; finally, the stacked web layer adheres to the lower end of the adsorption transfer section, and enters the stacked web exit channel based on the upward flipping of the upper fiber web, while with the cooperation of the conveyor curtain, the stacked web layer gradually detaches from the web exit transfer section and is output with the conveyor curtain to complete the web exit. Therefore, the present invention is based on multiple rows of slotted adsorption holes. The resulting peeling forces, varying at different angles and with evenly distributed adsorption width, not only eliminate the pulling during fiber web formation caused by instantaneous adsorption, but also improve the problem of insufficient transfer by the condensing roller. Simultaneously, the overlapping areas formed by the slot adsorption holes maintain uniform force during fiber web formation and stacking, thus increasing the quality of the finished web. Furthermore, the intersecting layout of the slot adsorption holes effectively blocks and disperses the moving airflow, eliminating bulging or internal / external pulling of the fiber web caused by the airflow. This also facilitates the fiber web's adherence to the adsorption transfer section and enables high-quality fiber web formation, stacking, and output during synchronous movement. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the laminated fiber web structure in this embodiment;

[0032] Figure 2 for Figure 1 Front view diagram;

[0033] Figure 3 for Figure 2 A top-down view;

[0034] Figure 4 for Figure 3 Enlarged cross-sectional view along the central AA direction;

[0035] Figure 5 for Figure 1 A partial structural diagram of the negative pressure auxiliary mechanism of the medium negative pressure adsorption mechanism;

[0036] Figure 6 for Figure 5 Front view diagram;

[0037] Figure 7 for Figure 6 Enlarged cross-sectional view of the middle BB direction;

[0038] Figure 8 for Figure 6 Rear view diagram;

[0039] The components are as follows: 1. Conveying curtain; 10. Horizontal section; 100. Connecting end; 11. Transfer section; 2. Circular transfer belt; 20. Adsorption transfer section; 21. Net exit transfer section; 22. Closed connection section; 3. Negative pressure adsorption mechanism; 30. Negative pressure chamber; 3a. First negative pressure chamber; 3b. Second negative pressure chamber; 3c. Third negative pressure chamber; 3d. Fourth negative pressure chamber; 300. Slit adsorption hole; x1. Pre-adsorption row; x2. Positive adsorption row; 31. Negative pressure connector; 4. Truss; 5. Triangle frame; 6. Transmission roller; 61. First roller; 62. Second roller; 63. Third roller; N. Condensation roller. Detailed Implementation

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] like Figures 1 to 8 As shown, the screen exiting process of the multi-doff carding machine in this embodiment adopts a screen exiting structure including a conveyor curtain 1, an annular transfer belt 2 located above the conveyor curtain 1, and a negative pressure adsorption mechanism 3 located inside the annular transfer belt 2. The multiple condensing rollers N of the multi-doff carding machine are located on one side of the annular transfer belt 2 and are arranged in a horizontally extended side-by-side layout from top to bottom.

[0045] Specifically, the structure and process of this application will be described using two cohesive rollers N as an example (double doffer carding machine).

[0046] In some specific embodiments, the conveyor curtain 1 is a conventional conveying device for flat-laid multilayered webs in the textile industry, and has a horizontal section 10 and a transfer section 11. Two condensing rollers N are located directly above the left side of the horizontal section 10 (that is, the two condensing rollers N are located above the right side of the receiving end 100 of the horizontal section 10), and the exit ends of the condensing rollers N are spaced apart from top to bottom and gradually moved inward to keep the exit ends aligned and form the exit end face. The annular transfer belt 2 has an adsorption transfer section 20 that intersects with the upper extension line of the exit end face and whose upper and lower ends extend beyond the upper and lower ends of the exit end face, an exit transfer section 21 that forms a multilayered exit channel with the conveyor curtain 1, and a closing connection section 22. Meanwhile, trusses 4 are provided on opposite sides of the conveyor curtain 1. The netting structure also includes a tripod 5 that moves on the truss 4 based on its extension direction, and multiple transmission rollers 6 installed between the tripods 5. The annular transfer belt 2 is fitted onto the multiple transmission rollers 6. The distance between the netting end face and the adsorption transfer section 20 is adjusted based on the movement of the tripods 5 relative to the truss 4. In other words, the angle formed by the intersection of the adsorption transfer section 20 and the top extension line of the netting end face is adjusted based on the position of the transmission rollers 6. Based on the adjustment of the angle and distance, the relative position setting between the netting end face and the adsorption transfer section is met under different working conditions, thereby meeting the requirements of multilayer netting.

[0047] In this example, there are three conveyor rollers 6, including a first roller 61, a second roller 62, and a third roller 63, which are spaced apart from top to bottom. The second roller 62 and the third roller 63 are located to the right and left of the first roller 61, respectively. The part of the annular transfer belt 2 between the first roller 61 and the third roller 63 is the adsorption transfer section 20, the part between the third roller 63 and the second roller 62 is the net exit transfer section 21, and the part between the second roller 62 and the first roller 61 is the closed connection section 22.

[0048] The negative pressure adsorption mechanism 3 includes multiple negative pressure chambers 30 that are flattened inside the adsorption transfer section 20 and aligned with the adsorption surfaces, a negative pressure connector 31 that communicates with the negative pressure chambers 30, and a negative pressure source. The upper end of the adsorption end face is located between the upper end of the adsorption transfer section 20 and the upper end of the net outlet end face, and the lower end of the adsorption end face is located between the lower end of the adsorption transfer section 20 and the lower end of the net outlet end face.

[0049] In this example, there are four negative pressure chambers 30, arranged sequentially from top to bottom. Each negative pressure chamber 30 has a slotted adsorption hole 300 formed on its adsorption end face. The two condensation rollers N correspond to the first negative pressure chamber 3a and the fourth negative pressure chamber 3d, respectively. The negative pressure chambers located between the two condensation rollers N are the second negative pressure chamber 3b and the third negative pressure chamber 3c. That is, the first negative pressure chamber 3a and the fourth negative pressure chamber 3d are stripping chambers, and the second negative pressure chamber 3b and the third negative pressure chamber 3c are transfer chambers.

[0050] Furthermore, two rows of slotted adsorption holes 300 are arranged on the adsorption end face of the first negative pressure chamber 3a (that is, the two rows of slotted adsorption holes 300 constitute a stripping group), and the two rows of slotted adsorption holes 300 are divided into a pre-adsorption row x1 and a positive adsorption row x2 based on the vertical direction. The pre-adsorption row x1 first strips the fibers on the coagulation roller N to change the fiber orientation from the exit end, and the positive adsorption row x2 forms an adsorption angle of less than 90° with the exit end, and the adsorption force of the positive adsorption row x2 is greater than that of the pre-adsorption row x1. Based on the gradually changing adsorption force formed at different positions, not only is the tensile deformation caused by the instantaneous adsorption eliminated, but the fiber is also more easily peeled off from the coagulation roller during the angle change, so as to reduce the probability of insufficient fiber transfer. At the same time, both the pre-adsorption row x1 and the positive adsorption row x2 are single rows of slotted adsorption holes 300, and the extension direction of the slotted adsorption holes 300 of the pre-adsorption row x1 and the positive adsorption row x2 is consistent with the length direction of the coagulation roller N. Based on consistent adsorption along the width direction, lateral stretching of the fiber web caused by adsorption is avoided, maintaining synchronization between the fiber web and the adsorption transfer section, thus providing conditions for high-quality web stacking. The slotted adsorption holes 300 in the pre-adsorption row x1 and the positive adsorption row x2 are evenly spaced, and the extension length of each row of slotted adsorption holes 300 is greater than the interval between two adjacent slotted adsorption holes 300. Based on the radiation of the adsorption area formed by the slotted adsorption holes 300, the adsorption and tension forces formed at the adsorption positions and intervals are kept relatively uniform, thus avoiding uneven stress caused by adsorption and facilitating synchronous movement of the fiber web to adhere to the adsorption transfer section. The two single rows of slotted adsorption holes are complementary, and the upper slotted adsorption hole 300 and the lower slotted adsorption hole 300, which are offset below, overlap at their ends in the vertical projection. This offset and overlapping of the projected ends not only effectively forms an even coverage of the fiber web along its width but also relatively maintains uniform fiber stress between the upper and lower layers. The vertical spacing between the pre-adsorption row x1 and the positive adsorption row x2 is M, and the slit width of each slit adsorption hole 300 is W, where W≤M≤2W. Based on the limitations of spacing and slit width, the slit adsorption holes satisfy uniform adsorption and form varying adsorption patterns to improve fiber transfer efficiency and quality. In some specific embodiments, the adsorption end face of the second negative pressure chamber 3b also forms a single row of slit adsorption holes 300 arranged side-by-side, wherein the extending direction of the slit adsorption holes 300 is the same as the layout direction of the adsorption transfer section 20, and they constitute a transfer group. That is, the slit adsorption holes 300 of the transfer group and the stripping group are arranged relatively perpendicularly; simultaneously, the first negative pressure chamber 3a and the second negative pressure chamber 3b are connected through the negative pressure cavity. The third negative pressure chamber 3c has the same structure as the second negative pressure chamber 3b, both being transfer groups; the fourth negative pressure chamber 3d has the same structure as the first negative pressure chamber 3a, both being stripping groups. The main difference between the two is the different positions of the two rows of slot adsorption holes 300. The position of the slot adsorption holes 300 depends entirely on the position of the lower condensation roller N, while the stripping principle is the same.Negative pressure connectors 31 are connected to the two ends of the fourth negative pressure chamber 3d and the first negative pressure chamber 3a respectively. Negative pressure is formed by synchronously drawing air from both ends. The negative pressure required by the two condensing rollers N is selected and adjusted according to actual needs. As for the negative pressure source, there can be one, or one condensing roller N can be arranged accordingly.

[0051] Specifically, the implementation process of this embodiment includes the following steps:

[0052] S1, Network Formation

[0053] The peeling group is directly opposite the discharge end of the coagulation roller. Multiple rows of slotted adsorption holes are staggered and spaced apart. Under the cooperation of peeling force with different angles and gradually changing adsorption width formed by multiple rows of slotted adsorption holes, the web formation direction and angle of the discharge end are changed, so as to form the upper fiber web in the bonding adsorption transfer section in the instantaneous positive adsorption force of the bonding adsorption transfer section.

[0054] S2, Switching Network

[0055] The intersecting slits and adsorption holes in the extension direction block and disperse the airflow in motion, so as to keep the upper fiber web flat against the adsorption transfer section and transfer it downward in sync with it.

[0056] S3, Overlay mesh

[0057] The upper fiber web enters the discharge end of the next coagulation roller. Step S1 is repeated, and the stripped fibers are attached to the surface of the upper fiber web to form a stacked web. At the same time, step S2 is repeated until the web formation and stacking of all coagulation rollers are completed to form a stacked web layer.

[0058] S4, Out of Net

[0059] The stacked mesh layer adheres to the lower end of the adsorption and transfer section, and enters the stacked mesh exit channel based on the upward flipping of the upper fiber mesh. Simultaneously, with the cooperation of the conveyor curtain, the stacked mesh layer gradually detaches from the mesh exit transfer section and is output with the conveyor curtain to complete the mesh exit.

[0060] In step S1, the multi-row slotted adsorption holes are divided into pre-adsorption rows and forward adsorption rows based on the vertical direction. The pre-adsorption rows first peel the fibers from the coagulation roller to change the fiber orientation from the exit end of the web. The forward adsorption rows form an adsorption angle of less than 90° opposite the exit end of the web, and the adsorption force formed by the forward adsorption rows is greater than that of the pre-adsorption rows. Based on the gradually changing adsorption force formed at different positions, not only is the tensile deformation caused by the instantaneous adsorption eliminated, but the change in angle is also more conducive to the peeling of fibers from the coagulation roller, thereby reducing the probability of insufficient fiber transfer. In step S2, the vertically arranged slotted adsorption holes intercept and evenly distribute the moving airflow. Since the extension direction of the slotted adsorption holes is perpendicular to each other, the moving airflow is blocked and reversed, thereby reducing the tensile rate caused by the airflow causing the fiber web to bulge. In step S3, a superimposed web is formed during the movement based on the constant adsorption force of the upper fiber web. That is, the pressure formed by peeling and superimposing the web is the same. In step S4, the netting transfer section is inclined from bottom to top, and the stacked netting channel gradually increases in size based on the conveyor curtain. Simultaneously, the stacked netting layer at the bottom of the adsorption transfer section flips and gradually transitions to the stacked netting channel with the upper fiber net facing upwards. Then, based on the separation of the upper fiber netting from the netting transfer section, the conveyor curtain outputs the netting. This flipping discharge method not only ensures a smooth transition of the stacked netting layer to the stacked netting channel under the flipping transfer force, avoiding the pulling of the stacked netting layer caused by the instantaneous loss of negative pressure, but also allows the flipped stacked netting layer to be laid flat on the conveyor curtain based on the output formed by the stacked netting channel, gradually separating from the netting transfer section, thus completing the netting discharge.

[0061] In summary, this invention, on the one hand, utilizes the gradually varying peeling force and evenly distributed adsorption width formed by multiple rows of slotted adsorption holes to not only eliminate the pulling during fiber web formation caused by instantaneous adsorption but also improves the problem of insufficient transfer by the condensing roller. Simultaneously, the overlapping areas formed by the slotted adsorption holes maintain uniform force during fiber web formation and stacking, thereby increasing the quality of the finished web. On the other hand, the intersecting layout of the slotted adsorption holes effectively blocks and disperses the moving airflow, eliminating the bulging or internal / external pulling of the fiber web caused by the moving airflow. Furthermore, it facilitates the fiber web's adherence to the adsorption and transfer section and enables high-quality fiber web formation and stacking during synchronous movement. The third aspect is based on the gradually changing adsorption force formed at different positions, which not only eliminates the tensile deformation caused by the instantaneous adsorption, but also facilitates the peeling of fibers from the coagulation roller during angular changes, thereby reducing the probability of insufficient fiber transfer; the fourth aspect is based on adsorption in the same width direction, which avoids lateral pulling of the fiber web caused by adsorption, and maintains the synchronization of the movement of the fiber web and the adsorption transfer section, thus providing conditions for high-quality web stacking; then, based on the radiation of the adsorption area formed by the slot adsorption holes, the adsorption and tension forces formed at the adsorption positions and interval positions are kept relatively uniform, thus avoiding uneven force caused by adsorption, and also facilitating the adhesion and adsorption transfer of the fiber web. The fifth aspect involves the overlapping of the ends formed by the misalignment and projection, which not only effectively achieves uniform coverage of the fiber web in the width direction but also maintains relatively uniform fiber stress between the upper and lower layers. Furthermore, based on the limitations of spacing and slit width, the slot adsorption holes satisfy uniform adsorption and form varying adsorption patterns to improve fiber transfer efficiency and quality. The sixth aspect involves the perpendicular extension directions of the slot adsorption holes to obstruct and redirect the airflow during movement, reducing the stretching rate caused by the airflow bulging of the fiber web. The seventh aspect involves the spacing between the condensing rollers in the transfer group, eliminating the gaps between the fiber webs formed by adjacent condensing rollers. The motion interference, while the superimposed adsorption force of the upper fiber web remains unchanged, forms a superimposed web, that is, the pressure formed by peeling and superimposing the web is the same; the eighth aspect is based on the flipping discharge method, which not only maintains the smooth transition of the superimposed web layer to the superimposed discharge channel under the flipping transfer force, avoiding the pulling of the superimposed web layer caused by the instantaneous loss of negative pressure; moreover, the superimposed web layer after flipping is output based on the superimposed discharge channel to lay the superimposed web layer flat on the conveyor curtain and gradually separate from the discharge transfer section, thereby completing the discharge. In addition, based on the adjustment of angle and distance, the relative position setting between the discharge end face and the adsorption transfer section under different working conditions is met, thereby meeting the requirements of superimposed web discharge.

[0062] 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 screen exiting process for a multi-doff carding machine, wherein the screen exiting ends of multiple condensing rollers are arranged at intervals from top to bottom and gradually shifted inward to maintain alignment of the screen exiting ends and form a screen exiting end face, characterized in that, The adopted netting structure includes an annular transfer belt and a negative pressure adsorption mechanism located inside the annular transfer belt. The annular transfer belt has an adsorption transfer section that intersects with the upper extension line of the netting end face and whose upper and lower ends extend beyond the upper and lower ends of the netting end face, a netting transfer section that forms a stacked netting channel with the conveyor curtain, and a closed connection section. The negative pressure end face formed by the negative pressure adsorption mechanism is based on the adsorption transfer section, and multiple rows of slotted adsorption holes are formed on the negative pressure end face. These slotted adsorption holes are divided into a peeling group and a transfer group, and the extension directions of the slotted adsorption holes in the transfer group and the peeling group intersect. The process includes the following steps: S1, Network Formation The stripping group faces the discharge end of the coagulation roller. Multiple rows of slotted adsorption holes are staggered vertically. Under the cooperation of the stripping force and the even distribution of the adsorption width formed by the multiple rows of slotted adsorption holes at different angles, the web formation direction and angle at the discharge end are changed. This is to form the upper fiber web in the bonding adsorption transfer section when the positive adsorption force of the bonding adsorption transfer section is reduced. The multiple rows of slotted adsorption holes are divided into pre-adsorption rows and positive adsorption rows based on the vertical direction. The pre-adsorption rows first strip the fibers on the coagulation roller to change the fiber direction from the web discharge end. The positive adsorption rows form an adsorption angle of less than 90° opposite the web discharge end, and the adsorption force formed by the positive adsorption rows is greater than that of the pre-adsorption rows. S2, Switching Network Based on the intersecting extension directions of the slit adsorption holes, the moving airflow is blocked and dispersed to keep the upper fiber web flat against the adsorption transfer section and move downward synchronously with it. The extension direction of the slit adsorption holes of the transfer group is the same as the extension direction of the adsorption transfer section. The extension directions of the slit adsorption holes of the transfer group and the stripping group are perpendicular. Based on the vertical layout of the slit adsorption holes, the moving airflow is intercepted and evenly distributed. S3, Overlay mesh The upper fiber web enters the discharge end of the next coagulation roller. Step S1 is repeated, and the stripped fibers are attached to the surface of the upper fiber web to form a stacked web. At the same time, step S2 is repeated until the web formation and stacking of all coagulation rollers are completed to form a stacked web layer. S4, Out of Net The stacked mesh layer adheres to the lower end of the adsorption and transfer section, and enters the stacked mesh exit channel based on the upward flipping of the upper fiber mesh. Simultaneously, with the cooperation of the conveyor curtain, the stacked mesh layer gradually detaches from the mesh exit transfer section and is output with the conveyor curtain to complete the mesh exit.

2. The web exiting process of the multi-doff carding machine according to claim 1, characterized in that, There is at least one pre-adsorption row, and the extension direction of the slot adsorption holes of the pre-adsorption row and the positive adsorption row is consistent with the length direction of the condensation roller.

3. The web exiting process of the multi-doff carding machine according to claim 2, characterized in that, The slit adsorption pores in the pre-adsorption row and the positive adsorption row are evenly spaced, and the extension length of the slit adsorption pores in each row is greater than the interval between two adjacent slit adsorption pores.

4. The web exiting process of the multi-dough carding machine according to claim 3, characterized in that, Both the pre-adsorption row and the positive adsorption row are single-row slit adsorption pores. The two single-row slit adsorption pores are complementary, and the upper slit adsorption pore and the lower slit adsorption pore overlap at their midpoints in the vertical direction projection.

5. The web exiting process of the multi-dough carding machine according to claim 4, characterized in that, The vertical spacing between the pre-adsorption row and the positive adsorption row is M, and the slit width of each adsorption pore is W, where W≤M≤2W.

6. The web exiting process of the multi-doff carding machine according to claim 1, characterized in that: Multiple condensation rollers are spaced apart based on the extension direction of the adsorption transfer section, wherein at least two aligned and spliced ​​transfer groups are arranged between each two adjacent condensation rollers.

7. The web exiting process of the multi-doff carding machine according to claim 6, characterized in that: Each coagulation roller corresponds to a negative pressure chamber, and the negative pressure chamber has an interconnected stripping group and a transfer group, and the negative pressure formed between the transfer groups is equal. In step S3, a stacked web is formed in motion based on the unchanged adsorption force of the upper fiber web.

8. The web exiting process of the multi-doff carding machine according to claim 1, characterized in that: In step S4, the netting transfer section is inclined from bottom to top, and the stacked netting channel gradually increases in size based on the conveyor curtain. At the same time, the stacked netting layer at the bottom of the adsorption transfer section flips and gradually flips to transition to the stacked netting channel with the upper fiber netting facing upward. Based on the separation of the upper fiber netting from the netting transfer section, the netting is output by the conveyor curtain.

9. The web exiting process of the multidoff carding machine according to any one of claims 1 to 8, characterized in that: Trusses are provided on opposite sides of the conveyor curtain. The netting structure also includes a tripod that moves on the truss based on the extension direction of the truss, multiple transmission rollers installed between the tripods, and an annular transfer belt fitted on the multiple transmission rollers. The distance between the netting end face and the adsorption transfer section is adjusted based on the movement of the tripod relative to the truss. The angle formed by the intersection of the adsorption transfer section and the top extension line of the netting end face is adjusted based on the position of the transmission rollers.

10. The web exiting process of the multi-doff carding machine according to claim 9, characterized in that: The negative pressure adsorption mechanism includes multiple negative pressure chambers that are flattened inside the adsorption transfer section and aligned with the adsorption surfaces, a negative pressure connector and a negative pressure source connected to the negative pressure chambers, wherein the upper end of the adsorption end face is located between the upper end of the adsorption transfer section and the upper end of the net outlet end face, the lower end of the adsorption end face is located between the lower end of the adsorption transfer section and the lower end of the net outlet end face, and multiple rows of slotted adsorption holes are formed on the adsorption surface.

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