Multi-purpose fiber web transfer structure based on mid-doffer layered transfer

Abstract

The present invention discloses a multi-purpose fiber web transfer structure based on mid-doffer layered transfer, including a first and a second transfer path. On the one hand, the present invention is based on multiple transfer paths to reduce the return load of the chest cylinder, and each transfer path forms the stretching, condensation and bonding of the fibers. At the same time, the layered transfer not only reduces the probability of fiber accumulation, entanglement and blockage, but also reduces the probability of cotton knots and white spots, thereby improving the uniformity, strength and productivity of the fiber combing transfer. In addition, the path is optional and practical. On the other hand, based on the top and bottom barriers of the unidirectional transfer section, airflow interference in condensation is avoided, and the probability of insufficient or incomplete fiber transfer is also reduced. In addition, based on the cooperation of the web output speed and time of each transfer path, each transfer path keeps the winding end aligned and is transferred to the large cylinder layer by layer from the inside to the outside, thereby eliminating the uneven thickness of the fiber web, improving the density and strength of the fiber web, and being suitable for the transfer and combing of various fibers.

Description

Technical Field

[0001] The invention belongs to the technical field of carding machines, and in particular relates to a multi-purpose fiber web transfer structure based on mid-doffer layered transfer. Background Art

[0002] The carding machine is a kind of textile machinery used to process fibers. Its working principle is to loosen, mix and remove impurities from the fiber raw materials that have been preliminarily processed, and to comb the block fibers into bundles and single fibers to form a thin layer of mesh fibers.

[0003] Currently, fibers are transferred between the chest cylinder and the large cylinder through a fiber web transfer structure, wherein the transfer structure includes a middle doffer and a middle transfer roller. The fibers from the chest cylinder pass around the middle doffer and are then transferred to the large cylinder by the middle transfer roller. However, with the needs of fiber denier, product weight, transfer speed, etc., if the middle doffer is used to transfer fine denier fibers (ultrafine fibers), the following technical defects will occur:

[0004] 1) Fine denier fibers have a large specific surface area, are lightweight, and are soft and flexible. The existing doffer wire clothing design (e.g., tooth density, tooth shape, angle, height) or surface condition (e.g., finish) may not be suitable for effectively grabbing and releasing such fine, easily tangled fibers. This results in inadequate transfer of fine denier fibers, which then become adsorbed on the doffer wire and difficult to remove, forming retention points that can develop into neps (core hazard: disruption of fiber uniformity, formation of dense lumps; terminal consequences: filtration blockage / mechanical weak areas / bacterial breeding grounds) and white spots (core hazard: localized fiber loss, interruption of structural continuity; terminal consequences: leakage / holes / protection failure).

[0005] 2) The transfer capacity (the amount of fiber transferred per unit time) of the doffer and its stripping device has an upper limit. When the machine speed (output) increases, the amount of fiber reaching the doffer per unit time exceeds its effective transfer capacity, causing fiber accumulation. At the same time, at high speeds, the distribution uniformity and directionality of the fiber flow on the doffer surface deteriorate, making local accumulation more likely to occur. The accumulated fibers are easily entangled (roller-wrapped) by the high-speed rotating roller. Then, tiny impurities (dust, short fibers) that have not been fully removed flow in with the fiber flow and are more likely to become entangled with the fibers in areas where the transfer is insufficient, exacerbating blockage (impurity blockage).

[0006] 3) It is impossible to form a double-layer web and transfer it to the large cylinder at the same time (it is impossible to transfer it to the large cylinder in layers), and in one-time fiber transfer, the fiber web will be too thick or too thin, that is, the uniformity and web quality are insufficient; at the same time, the fiber transfer process only involves stretching, and there is no chance of condensation and bonding. The density and strength of the fiber web are difficult to meet the processing requirements, and it will also affect the quality of the fiber web. Summary of the Invention

[0007] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an improved multi-purpose fiber web transfer structure based on mid-doffer layered transfer.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is:

[0009] A multi-purpose fiber web transfer structure based on middle doffer layered transfer, which is located between a breast cylinder and a large cylinder arranged on the left and right, and includes a middle doffer and a middle transfer roller, which rotate in the same direction to form a first transfer path. The first transfer path is based on the top or bottom of the middle doffer and the middle transfer roller. The fibers stripped from the breast cylinder are transferred to the large cylinder in a unidirectional transfer section by bypassing the two tops or two bottoms in sequence; the fiber web transfer structure also includes a second transfer path located between the breast cylinder and the large cylinder. There is at least one second transfer path, which is staggered and separated from the first transfer path. Separated unidirectional transfer sections are also formed in the diameter, and the feed end and the discharge end of the first and second transfer paths are tangent to the right side of the breast cylinder and the left side of the large cylinder from top to bottom respectively; the unidirectional transfer sections of the first and second transfer paths are distributed up and down and relatively spaced at the top and bottom. The fibers on the breast cylinder are peeled off in layers from outside to inside as the breast cylinder rotates and based on the first and second transfer paths. After the layered fibers pass through the unidirectional transfer sections of the corresponding paths, they are transferred to the large cylinder with increasing thickness layer by layer based on the cooperation of the outlet speed and time of each transfer path so that the winding ends of each transfer path are kept aligned and transferred to the large cylinder from inside to outside.

[0010] Preferably, layered stripping is performed sequentially from top to bottom, while layer-by-layer thickening is performed sequentially from bottom to top. Based on the layered stripping during the following rotation, the breast cylinder can be stripped all at once as it passes through each transfer path, thereby reducing the breast cylinder load. That is, the feed rate can be increased without causing cotton entanglement on the breast cylinder. As for layer-by-layer thickening, it is performed at the same speed and with the same tension or pulling force, resulting in relatively uniform density and thickness of the resulting fiber web.

[0011] Furthermore, the sum of the thickness of the layered stripping is equal to the thickness of the fiber layer on the breast cylinder. This combing method is more conducive to the transfer of fibers.

[0012] In some embodiments, the layered stripping is performed in layers of equal thickness, and the layered thickening is performed in layers of equal thickness. This stripping and lamination process not only avoids excessively thick or thin areas caused by transferring all the fibers at once, improving subsequent carding uniformity and web quality, but also shares the load on the cylinder, preventing fiber accumulation or clogging.

[0013] According to a specific embodiment and preferred aspect of the present invention, during layer-by-layer thickening, the web delivery speed and timing are coordinated, maintaining the web delivery speed constant while varying the web delivery timing to ensure that the winding ends at each delivery end are aligned and bonded for thickening. Because the web delivery speed is constant, the resulting winding forces are the same, thus avoiding uneven thickness caused by excessive stretching during the lamination of multiple webs.

[0014] In some specific embodiments, the first transfer path is located at the bottom, with its unidirectional transfer section at the bottom. A single second transfer path is located above the first transfer path, with its unidirectional transfer section at the top. This dual-path configuration not only allows for selective transfer to meet the transfer needs of different fibers, but also utilizes a dual-layer transfer method to meet the needs of combing and transferring low-weight, high-speed layers of cotton, resulting in faster speeds and higher quality.

[0015] Preferably, the web exiting the first transfer path is wound around the large cylinder and transferred along with it. When passing the discharge end of the second transfer path, the synchronously moving fiber web is aligned and bonded to the inner fiber web from the ends, and the fiber web transfer is completed as the large cylinder rotates. This prevents incomplete transfer during the web exit process due to misaligned ends of the fibers on the large cylinder.

[0016] In some specific embodiments, the net exit speed formed by the first transfer path is V1, the net exit stroke is S1, and the time required for net exit is t1. The net exit speed formed by the second transfer path is V2, the net exit stroke is S2, and the time required for net exit is t2. The arc length formed by the net exit ends of the first and second transfer paths is L, where V1=V2, S2-S1=L=ω×(t2-t1)×r, ω is the angular velocity of the large cylinder, and r is the radius of the large cylinder. In short, the arc length L can be directly obtained or directly obtained from the material exit stroke difference. If ω and r are both known, then T2-T1 can be directly obtained. That is, at the same net exit speed, the net exit wait formed based on the time difference can achieve alignment of the fiber web ends. It should also be noted that this is only an optimal embodiment.

[0017] According to another specific embodiment and preferred aspect of the present invention, the second transfer path includes first, second, third, and fourth transfer rollers, arranged from left to right between the chest cylinder and the main cylinder. The first transfer roller is a chest cylinder working roller, and the fourth transfer roller is a stripping roller. The unidirectional transfer section consists of the upper fiber web passing through the second and third transfer rollers. The layout of the unidirectional transfer section prevents airflow generated by the rollers from interfering with or disrupting the fiber web transfer, thereby improving transfer quality and efficiency.

[0018] Preferably, the upper portion of the second transfer roller is located above and below the third transfer roller, and the lower portion of the fourth transfer roller is located below and above the first transfer roller. This four-roller layout not only creates the required unidirectional transfer section but also provides corresponding stretching and condensation combinations at different height differences to meet the required quality (such as density).

[0019] According to another specific embodiment and preferred aspect of the present invention, the second transfer path further includes a return stripping roller that is tangential to the breast cylinder work roll and is capable of returning residual fibers on the breast cylinder work roll to the breast cylinder, wherein the return stripping roller is located above and to the side of the breast cylinder work roll and arranged close to the breast cylinder. The return stripping roller returns fibers that may remain on the breast cylinder work roll to the breast cylinder, thereby reducing the probability of accumulation, entanglement, and blockage of the breast cylinder work roll.

[0020] In some specific embodiments, the return stripping roller is tangential to the breast cylinder and the breast cylinder work roller, respectively. The breast cylinder and the breast cylinder work roller rotate in opposite directions; the breast cylinder work roller and the return stripping roller rotate in the same direction; and the breast cylinder and the return stripping roller rotate in opposite directions. This tangential coordination of the three not only improves fiber return efficiency but also eliminates the impact of airflow generated by the breast cylinder work roller on the fibers to be separated on the breast cylinder.

[0021] According to another specific embodiment and preferred aspect of the present invention, the first transfer path further includes a windshield roller disposed between the breast cylinder and the middle doffer and blocking the inlet end of the second transfer path. The windshield roller serves to isolate airflow, thereby preventing it from affecting the fiber transfer on the breast cylinder.

[0022] Preferably, the windshield roller is located above and to the side of the mid-doffer and is capable of self-rotation. The windshield roller and the mid-doffer rotate in opposite directions, and the windshield roller's speed is adjustable based on the mid-doffer's speed. The windshield roller's self-rotation prevents fibers from adhering to or accumulating on the roller surface, keeping the surface clean and facilitating fiber transfer. For example, in a special single-roller transfer mechanism, the windshield roller strips the remaining fibers from the mid-doffer at a higher speed. When used for fiber stripping, Vwindshield > Vmid-doffer (linear speed) must be met to ensure that fibers are transferred from the low-speed roller to the high-speed roller. If used solely for windshield protection, the speed can be lower, but rotation is still required to prevent fiber accumulation.

[0023] Furthermore, the breast and main cylinders rotate in the same direction. Essentially, this design utilizes a velocity gradient in conjunction with the card clothing to achieve continuous, efficient fiber transfer with minimal fiber damage and high orientation, while also reducing energy consumption and losses. This design significantly impacts the uniformity, strength, and productivity of nonwoven materials. When the breast cylinder transfers the initially loosened fibers to the main cylinder, the movement of the two at the contact point (tangent point) must meet the following requirements: the breast cylinder surface speed is less than the main cylinder surface speed (e.g., 400 m / min for the breast cylinder and 800 m / min for the main cylinder; in short, the difference is at least two times). The velocity gradient: The faster main cylinder speed generates a "pulling force" that gently pulls the fibers from the lower-speed roller (breast cylinder) and attracts them to the surface of the card clothing. Motion coordination: Co-rotation ensures consistent fiber movement at the contact point, preventing fiber breakage caused by reverse pull.

[0024] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0025] In the transfer of existing fiber webs, fine denier fibers have a large specific surface area, are light in weight, and are soft and easy to bend. If a mid-doffer is used to transfer fine denier fibers, the needle cloth design (such as tooth density, tooth shape, angle, height) or surface state (such as smoothness) of the mid-doffer may not be suitable for effectively grabbing and releasing such fine and easily entangled fibers, resulting in insufficient transfer of fine denier fibers. The fibers will be adsorbed on the doffer needle cloth and difficult to peel off, forming retention points, and then develop into cotton knots (core hazard: destruction of fiber uniformity, formation of dense hard lumps; terminal consequences: filtration blockage / mechanical weak areas / bacterial breeding grounds) and white spots (core hazard: local fiber loss, interruption of structural continuity; terminal consequences: leakage / holes / protection failure); at the same time, the transfer capacity (amount of fiber transferred per unit time) of the mid-doffer and its stripping device has an upper limit. When the machine speed (output) increases, the amount of fiber reaching the mid-doffer per unit time exceeds its effective transfer capacity, causing fiber accumulation; at the same time, high speed Under this condition, the distribution uniformity and directionality of the fiber flow on the doffer surface become worse, local accumulation is more likely to occur, and the accumulated fibers are easily entangled (roller-wrapped) under the drive of the high-speed rotating roller. Then, tiny impurities (dust, short fibers) that have not been fully removed flow in with the fiber flow, and are more likely to be entangled with the fibers in the area where the transfer is insufficient, aggravating the blockage (impurities blockage); in addition, it is impossible to form a double-layer web and transfer it to the large cylinder at the same time (it is impossible to transfer it to the large cylinder in layers), and in one transfer of the fibers, the fiber web will be too thick or too thin. In other words, both the uniformity and the web surface quality are insufficient; at the same time, there is only stretching in the process of transferring the fibers, and there is no chance of condensation and bonding. The density and strength of the fiber web are difficult to meet the processing requirements, and it will also affect the quality of the fiber web and other deficiencies. The present invention cleverly solves the various deficiencies of the existing structure by overall design of a multi-purpose fiber web transfer structure based on layered transfer in the middle doffer.After adopting the multi-purpose fiber web transfer structure, the fiber layers on the chest cylinder are relatively divided from outside to inside according to the number of paths, and are layered from top to bottom along the rotation path of the chest cylinder; the fiber webs entering each layer path pass through the corresponding unidirectional transfer section to form stretching and bonding cooperation, and then, from bottom to top and from inside to outside, they are transferred to the large cylinder in layers, and are stretched and bonded again on the large cylinder to complete the transfer of fibers from the chest cylinder to the large cylinder. Therefore, on the one hand, the present invention is based on multiple transfer paths formed by layered stripping to reduce the return load of the chest cylinder, and each transfer path forms a process of stretching, condensing and bonding the fibers. At the same time, in the layered and stacked transfer, not only the probability of fiber accumulation, entanglement and blockage is reduced, It also reduces the probability of neps and white spots due to insufficient fiber transfer, thereby improving the uniformity, strength and productivity of fiber combing transfer. In addition, the path use is optional and highly practical. On the other hand, the top and bottom barriers of the one-way transfer section formed by the first and second transfer paths prevent the fibers from being disturbed by airflow during the condensation process, while also reducing the probability of insufficient or incomplete fiber transfer under airflow interference. In addition, layered stripping is implemented while maintaining the tangential angle, and based on the collaboration of the web output speed and time of each transfer path, each transfer path keeps the winding end aligned and is transferred to the large cylinder from the inside to the outside in a layer-by-layer thickening manner, thereby eliminating the uneven thickness of the fiber web and improving the density and strength of the fiber web, making it suitable for the transfer and combing of various fibers. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the multi-purpose fiber web transfer structure based on mid-doffer layered transfer in this embodiment;

[0027] Figure 2 for Figure 1 The main schematic diagram of

[0028] Figure 3 for Figure 2 Schematic top view of

[0029] Figure 4 for Figure 3 Middle AA cross-sectional view;

[0030] Figure 5 Schematic diagram of the working principle of this embodiment;

[0031] Among them: 1. Chest cylinder; 2. Large cylinder; 3. Middle doffer; 4. Middle transfer roller; 5. Windshield roller; 6. First transfer roller; 7. Second transfer roller; 8. Third transfer roller; 9. Fourth transfer roller; 10. Reflux stripping roller; ①, first transfer path; ②, second transfer path. DETAILED DESCRIPTION

[0032] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0033] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0034] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0035] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0036] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher horizontal height than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower horizontal height than the second feature. It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can be an intermediate element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there can be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0037] like Figures 1 to 5 As shown, the multi-purpose fiber web transfer structure based on the layered transfer of the middle doffer in this embodiment is located between the chest cylinder 1 and the large cylinder 2 arranged on the left and right, and includes a middle doffer 3 and a middle transfer roller 4. The middle doffer 3 and the middle transfer roller 4 rotate in the same direction to form a first transfer path ①. The first transfer path is based on the bottom of the middle doffer 3 and the middle transfer roller 4. The fibers stripped from the chest cylinder 1 are transferred to the large cylinder 2 in a unidirectional transfer section by bypassing the two bottoms or the two tops in turn; the fiber web transfer structure also includes a second transfer path ② located between the chest cylinder 1 and the large cylinder 2, wherein there is at least one second transfer path ②, and it is staggered and separated from the first transfer path ① above and below.

[0038] The feeding end and the discharging end of the first transfer path ① and the second transfer path ② are respectively tangent to the right side of the breast cylinder 1 and the left side of the large cylinder 2 from top to bottom; a plurality of second transfer paths ② are also formed with separated unidirectional transfer sections, and the unidirectional transfer sections of the first transfer path ① and the second transfer path ② are distributed up and down and relatively spaced at the top and bottom. The fibers on the breast cylinder 1 are peeled off in layers from outside to inside as the breast cylinder 1 rotates and based on the first transfer path ① and the second transfer path ②. After the layered stripped fibers pass through the unidirectional transfer sections of the corresponding paths, they are transferred to the large cylinder 2 in a layer-by-layer manner based on the coordination of the outlet speed and time of each transfer path so that the winding ends of each transfer path are kept aligned and transferred to the large cylinder 2 from inside to outside with increasing thickness.

[0039] In some specific embodiments, the first transfer path ① is located at the bottom, with its unidirectional transfer section at the bottom. A single second transfer path ② is located above the first transfer path ①, with its unidirectional transfer section at the top. This dual-path configuration not only allows for selective transfer to meet the transfer needs of different fibers, but also utilizes a dual-layer transfer method to meet the needs of combing and transferring low-weight, high-speed layers of cotton, resulting in faster speeds and higher quality.

[0040] The first transfer path ① further includes a windshield roller 5 disposed between the breast cylinder 1 and the middle doffer 3 and blocking the inlet end of the second transfer path ②. The windshield roller 5 serves to isolate the airflow and prevent it from affecting the fiber transfer on the breast cylinder 1.

[0041] The windshield roller 5 is located above and to the side of the mid-doffer 3 and is capable of self-rotation. The windshield roller 5 rotates in opposite directions to the mid-doffer 3, and its speed is adjustable based on the speed of the mid-doffer 3. The windshield roller 5's self-rotation prevents fibers from adhering to or accumulating on the roller surface, keeping the surface clean and facilitating fiber transfer. For example, in a special single-roller transfer mechanism, the windshield roller strips the remaining fibers from the mid-doffer at a higher speed. When used for fiber stripping, Vwindshield > Vmid-doffer (linear speed) must be met to ensure that fibers are transferred from the low-speed roller to the high-speed roller. If used solely for windshield protection, the speed can be lower, but rotation is still required to prevent fiber accumulation.

[0042] The second transfer path ② comprises the first, second, third, and fourth transfer rollers 6, 7, 8, and 9, arranged from left to right between the breast cylinder 1 and the large cylinder 2. The first transfer roller 6 is the breast cylinder working roller, and the fourth transfer roller 9 is the stripping roller. The unidirectional transfer section consists of the upper fiber web passing through the second and third transfer rollers 7 and 8. This unidirectional transfer section prevents airflow generated by the rollers from interfering with or disrupting the fiber web transfer, improving transfer quality and efficiency. The upper portion of the second transfer roller 7 is located below and above the third transfer roller 8; the lower portion of the fourth transfer roller 9 is located below and above the first transfer roller 6. This four-roller layout not only creates the required unidirectional transfer section but also produces corresponding stretching and condensation combinations at different height differences to meet the required quality (such as density). At the same time, the second transfer path ② also includes a return stripping roller 10 that is tangent to the chest cylinder working roller and can return the residual fibers on the chest cylinder working roller to the chest cylinder 1, wherein the return stripping roller 10 is located on the upper side of the chest cylinder working roller and is close to the chest cylinder. The return stripping roller returns the fibers that may remain on the chest cylinder working roller to the chest cylinder 1, reducing the probability of accumulation, entanglement, and blockage of the chest cylinder working roller. In some specific embodiments, the return stripping roller 10 is tangent to the chest cylinder 1 and the chest cylinder working roller, respectively, wherein the chest cylinder 1 and the chest cylinder working roller rotate in opposite directions; the chest cylinder working roller and the return stripping roller 10 rotate in the same direction; and the chest cylinder 1 and the return stripping roller 10 rotate in opposite directions. Based on the tangential coordination of the three, not only is the fiber return efficiency formed high, but it also eliminates the influence of the airflow generated by the chest cylinder working roller on the fibers to be layered on the chest cylinder.

[0043] In some specific embodiments, the layered stripping is carried out in sequence from top to bottom; the layer-by-layer thickening is carried out in sequence from bottom to top. Based on the layered stripping during the rotation, the breast cylinder can be stripped at one time through each transfer path to reduce the load on the breast cylinder, that is, the feeding amount is increased, and the breast cylinder will not produce the phenomenon of cotton winding; as for the layer-by-layer thickening, it is carried out at the same speed, and the fiber web is wound together under the same tension or traction force, so that the density and thickness of the formed fiber web are relatively uniform. The sum of the thickness of the layered stripping is equal to the thickness of the fiber layer on the breast cylinder. This combing method is more conducive to the transfer of fibers. In this example, the layered stripping is equal thickness layering; the layer-by-layer thickening is equal thickness stacking. The stripping and bonding formed in this way not only avoid the excessively thick or thin areas caused by the one-time transfer of all fibers, improve the uniformity of subsequent combing and improve the quality of the mesh surface; but also share the load of the cylinder to prevent fiber accumulation or blockage. During the layer-by-layer thickening, the speed and time of each web outlet are coordinated to keep the web outlet speed equal, and the web outlet time is changed so that the winding ends moving to each outlet end are aligned and fit together for thickening. Based on the same web outlet speed, the winding force formed is the same, avoiding the phenomenon of uneven thickness caused by transitional stretching during the lamination of multiple fiber webs. The web outlet of the first transfer path ① is wrapped around the large cylinder and transferred along with it, and when passing the outlet end of the second transfer path ②, the synchronously moving fiber web X and the inner layer fiber web X are aligned and fit together from the end, and the fiber web transfer is completed as the large cylinder 2 rotates. This avoids insufficient transfer of the fibers on the large cylinder during the web outlet process due to misaligned ends. In some specific embodiments, the net exit speed formed by the first transfer path ① is V1, the net exit stroke is S1, and the time required for net exit is t1. The net exit speed formed by the second transfer path ② is V2, the net exit stroke is S2, and the time required for net exit is t2. The arc length formed by the net exit ends of the first and second transfer paths is L, where V1=V2, S2-S1=L=ω×(t2-t1)×r, ω is the angular velocity of the large cylinder, and r is the radius of the large cylinder. In short, the arc length L can be directly obtained or directly obtained from the discharge stroke difference. If ω and r are both known, then T2-T1 can be directly obtained. That is, at the same net exit speed, the net exit wait formed based on the time difference can achieve alignment of the fiber web ends. It should also be noted that this is only an optimal embodiment.

[0044] Furthermore, the breast and main cylinders rotate in the same direction. Essentially, this design utilizes a velocity gradient in conjunction with the card clothing to achieve continuous, efficient fiber transfer with minimal fiber damage and high orientation, while also reducing energy consumption and losses. This design significantly impacts the uniformity, strength, and productivity of nonwoven materials. When the breast cylinder transfers the initially loosened fibers to the main cylinder, the movement of the two at the contact point (tangent point) must meet the following requirements: the breast cylinder surface speed is less than the main cylinder surface speed (e.g., 400 m / min for the breast cylinder and 800 m / min for the main cylinder; in short, the difference is at least two times). The velocity gradient: The faster main cylinder speed generates a "pulling force" that gently pulls the fibers from the lower-speed roller (breast cylinder) and attracts them to the surface of the card clothing. Motion coordination: Co-rotation ensures consistent fiber movement at the contact point, preventing fiber breakage caused by reverse pull.

[0045] In summary, after adopting the multi-purpose fiber web transfer structure, the fiber layers on the breast cylinder are relatively divided from outside to inside according to the number of paths, and are layered successively from top to bottom along the rotating path of the breast cylinder; the fiber webs entering each layer of the path are all subjected to the corresponding unidirectional transfer section to form stretching and bonding cooperation, and then, are transferred to the large cylinder from bottom to top and from inside to outside in succession to form layered stacking thickness, and are stretched and bonded again on the large cylinder to complete the transfer of the fibers from the breast cylinder and the large cylinder. Therefore, on the one hand, the present invention is based on the multiple transfer paths formed by layered stripping to reduce the return load of the breast cylinder, and each transfer path forms a process of stretching, condensing and bonding the fibers. At the same time, in the layered stacking transfer, not only the probability of fiber accumulation, entanglement and blockage is reduced, but also the probability of cotton knots and white spots due to insufficient fiber transfer is reduced, thereby improving the uniformity, strength and productivity of the fiber combing transfer. In addition, the path use is optional and has strong practicality. On the other hand, based on the first and second The top and bottom barriers of the one-way transfer section formed by the transfer path prevent the fibers from being disturbed by airflow during the condensation process, and also reduce the probability of insufficient or incomplete fiber transfer under airflow interference. In addition, layered stripping is implemented while maintaining the tangential angle, and based on the cooperation of the web outlet speed and time of each transfer path, each transfer path keeps the winding ends aligned and is transferred to the large cylinder from the inside to the outside in a layer-by-layer thickening manner, thereby eliminating the uneven thickness of the fiber web and improving the density and strength of the fiber web, which is suitable for the transfer and combing of various fibers; thirdly, based on the layered stripping during the rotation, the breast cylinder can be stripped once through each transfer path to reduce the load on the breast cylinder, that is, increase the feed amount, and the breast cylinder will not produce cotton winding; as for layer-by-layer thickening, it is carried out at the same speed and wrapped under the same tension or traction force, so that the density and thickness of the formed fiber web are relatively uniform; at the same time, the layered stripping is equal thickness layering; and the layer-by-layer thickening is equal thickness stacking.The stripping and lamination formed in this way not only avoids the excessively thick or thin areas caused by the one-time transfer of all fibers, improves the uniformity of subsequent combing and improves the quality of the mesh surface; but also shares the load of the cylinder to prevent fiber accumulation or blockage; fourthly, in the layer-by-layer thickening, the cooperation of each mesh speed and time is to keep the mesh speed equal, and change the mesh time so that the winding ends moving to each material outlet end are aligned and laminarized for thickening. Based on the same mesh speed, the winding force formed is the same, avoiding the uneven thickness caused by excessive stretching in the lamination of multi-layer fiber webs, and at the same time avoiding the uneven thickness caused by the misalignment of the ends of the fibers on the large cylinder. The transfer during the web-out process is insufficient; the fifth aspect adopts a dual-path setting, which not only forms a selective transfer method to meet the transfer needs of different fibers; but also is based on a double-layer transfer method to meet the combing and transfer needs of low-weight, high-speed cotton layers, with faster speed and higher quality; the sixth aspect is based on the layout of the unidirectional transfer section to avoid the airflow formed by each roller during the transfer from interfering with or damaging the fiber web transfer, thereby improving the transfer quality and efficiency, and based on the layout of the rollers, not only the required unidirectional transfer section is formed, but also the corresponding stretching and condensation combinations are formed at different height differences to meet the required quality (such as density) needs; the seventh aspect On the one hand, the fibers that may remain on the chest cylinder working roller are returned to the chest cylinder by the reflux stripping roller, thereby reducing the probability of accumulation, entanglement and blockage of the chest cylinder working roller. At the same time, based on the tangential coordination of the three, not only is the fiber reflux efficiency formed high, but also the airflow generated by the chest cylinder working roller is eliminated to affect the fibers to be layered on the chest cylinder. On the other hand, the windshield roller is used to isolate the airflow to avoid the airflow affecting the fiber transfer on the chest cylinder. At the same time, the windshield roller rotates by itself to prevent the fibers from sticking or accumulating on the roller surface, keeping the surface clean and assisting the fiber transfer. For example, in a special single-roller transfer mechanism, the windshield roller rotates at a higher speed. To strip the remaining fibers on the doffer, when used for stripping fibers, V windshield> V doffer (linear speed) must be satisfied to ensure that the fibers are transferred from the low-speed roller to the high-speed roller. If it is only used for windshield, the speed can be lower, but it still needs to rotate to avoid flower accumulation. In addition, the chest cylinder and the large cylinder rotate in the same direction. Its essence is to achieve low fiber damage, high orientation, and high efficiency continuous transfer through the coordination of speed gradient and needle clothing, while reducing energy consumption and loss. This design will have a greater impact on ensuring the uniformity, strength and productivity of non-woven materials. Then, when the chest cylinder delivers the initially opened fibers to the large cylinder, the two are at the contact point (Tangent The movement of the lower-speed roller (breast cylinder) must meet the following requirements: the surface linear speed of the breast cylinder is less than the surface linear speed of the larger cylinder (e.g., the breast cylinder speed is 400 m / min, and the larger cylinder speed is 800 m / min. In short, the difference between the two is at least twice). The speed gradient is that the faster linear speed of the larger cylinder generates "traction" to gently peel the fibers from the lower-speed roller (breast cylinder) and adsorb them to the surface of their own card clothing. The movement coordination is that the same-direction rotation ensures that the fibers at the contact points move in the same direction, preventing the fibers from being pulled in the opposite direction and breaking.

[0046] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit of the present invention are intended to be covered by the scope of protection of the present invention.

Claims

1. A multi-purpose fiber web transfer structure based on middle doffer layered transfer, which is located between the chest cylinder and the large cylinder arranged on the left and right, and includes a middle doffer and a middle transfer roller, characterized by: The middle doffer and the middle transfer roller rotate in the same direction to form a first transfer path. The first transfer path is based on the bottom of the middle doffer and the middle transfer roller. The fibers stripped from the chest cylinder are transferred to the large cylinder in a unidirectional transfer section by bypassing the two bottoms in sequence. The first transfer path is located at the bottom, and the unidirectional transfer section of the first transfer path is located at the bottom. The fiber web transfer structure also includes a second transfer path located between the breast cylinder and the large cylinder. There is one second transfer path, which is arranged above the first transfer path. The unidirectional transfer section of the second transfer path is located at the top. The feed end and the discharge end of the first and second transfer paths are tangent to the right side of the breast cylinder and the left side of the large cylinder from bottom to top, respectively. The fibers on the breast cylinder are peeled off in layers from outside to inside as the breast cylinder rotates and based on the first and second transfer paths. After the layered fibers pass through the unidirectional transfer section of the corresponding path, based on the coordination of the discharge speed and time of each transfer path, the winding ends of each transfer path are kept aligned and transferred to the large cylinder from inside to outside in a layer-by-layer manner with increasing thickness. The second transfer path includes the first, second, third and fourth transfer rollers arranged from left to right between the chest cylinder and the large cylinder, wherein the unidirectional transfer section is composed of the upper fiber web passing through the second and third transfer rollers; The net exit speed formed by the first transfer path is V1, the net exit stroke is S1, and the time required for the net exit is t1. The net exit speed formed by the second transfer path is V2, the net exit stroke is S2, and the time required for the net exit is t2. The arc length formed by the net exit ends of the first and second transfer paths is L, where V1=V2, S2-S1=L=ω×(t2-t1)×r, ω is the angular velocity of the large cylinder, and r is the radius of the large cylinder.

2. The multi-purpose fiber web transfer structure based on mid-doffer layered transfer according to claim 1, characterized in that: The layered stripping is carried out from top to bottom in sequence; the layer-by-layer thickening is carried out from bottom to top in sequence.

3. The multi-purpose fiber web transfer structure based on mid-doffer layered transfer according to claim 2, characterized in that: The sum of the thickness of the layered stripping is equal to the thickness of the fiber layer on the breast cylinder.

4. The multi-purpose fiber web transfer structure based on mid-doffer layered transfer according to claim 2, characterized in that: Layered peeling is equal thickness layering; layer-by-layer thickening is equal thickness stacking.

5. The multi-purpose fiber web transfer structure based on mid-doffer layered transfer according to claim 1, characterized in that: The outgoing web of the first transfer path is wound around the large cylinder and transferred along with it. When it passes the outgoing end of the second transfer path, the synchronously moving fiber web is aligned and fitted with the inner fiber web from the end, and the fiber web transfer is completed as the large cylinder rotates.

6. The multi-purpose fiber web transfer structure based on mid-doffer layered transfer according to claim 1, characterized in that: The first transfer roller is a breast cylinder working roller, the fourth transfer roller is a stripping roller, and the upper part of the second transfer roller is located below and to the side of the third transfer roller.

7. The multi-purpose fiber web transfer structure based on mid-doffer layered transfer according to claim 6, characterized in that: The lower portion of the fourth transfer roller is located laterally below the first transfer roller.

8. The multi-purpose fiber web transfer structure based on mid-doffer layered transfer according to claim 7, characterized in that: The second transfer path also includes a return stripping roller that is tangent to the breast cylinder working roller and can return the residual fibers on the breast cylinder working roller to the breast cylinder, wherein the return stripping roller is located above the side of the breast cylinder working roller and close to the breast cylinder layout.

9. The multi-purpose fiber web transfer structure based on mid-doffer layered transfer according to claim 8, characterized in that: The reflow stripping roller is tangent to the breast cylinder and the breast cylinder working roller respectively, wherein the breast cylinder and the breast cylinder working roller rotate in opposite directions; the breast cylinder working roller and the reflow stripping roller rotate in the same direction; the breast cylinder and the reflow stripping roller rotate in opposite directions.

10. The multi-purpose fiber web transfer structure based on mid-doffer layered transfer according to claim 1, characterized in that: The first transfer path further includes a windshield roller which is arranged between the chest cylinder and the middle doffer and blocks the feeding end of the second transfer path.

11. The multi-purpose fiber web transfer structure based on mid-doffer layered transfer according to claim 10, characterized in that: The windshield roller is located above and to the side of the middle doffer and can be arranged to rotate on its own, wherein the windshield roller and the middle doffer rotate in opposite directions, and the speed of the windshield roller is adjustable based on the speed of the middle doffer.

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