Composite rollers and extrusion units

Abstract

This application relates to the field of metal processing technology and discloses a composite roller and an extrusion unit. The composite roller includes: a roller core; a rubber coating layer covering the outer periphery of the roller core; and a non-woven fabric roller sleeve fitted onto and fixedly connected to the rubber coating layer. The non-woven fabric roller sleeve includes multiple layers of stacked non-woven fabric rings, which are formed into an integral structure through extrusion and heating. The non-woven fabric roller sleeve rotates synchronously with the rubber coating layer and the roller core. Through the above method, this application not only ensures the quality of the sheet material but also guarantees the performance of the composite roller.

Description

Technical Field

[0001] This application relates to the field of metal processing technology, specifically to a composite roller and an extrusion unit. Background Technology

[0002] In the production of sheet metal, strong acids and other corrosive liquids are typically used to clean the sheet to remove impurities from its surface. Following this process, a desqueezing unit usually uses its desqueezing rollers to squeeze out the corrosive liquid from the upper and lower surfaces of the sheet, preventing it from entering subsequent processes. During the desqueezing process, the desqueezing rollers come into direct contact with these corrosive liquids, which rapidly degrades their performance.

[0003] For example, when the squeeze roller is a rubber roller, the rubber layer on its surface is made of rubber or polymer materials, which have relatively weak rigidity and are easily damaged during production. Furthermore, during cleaning, corrosive liquids such as strong acids typically have high temperatures, which accelerates the aging of the rubber layer in direct contact with the corrosive liquid. The aged rubber layer lacks elasticity and is prone to cracking when the roller rotates at high speed. Cracked rubber layers can easily scratch the sheet material, reducing its quality. Moreover, corrosive liquids can easily seep into the roller core through the cracks, corroding it and thus reducing the roller's performance. Utility Model Content

[0004] In view of the above problems, this application provides a composite roller and extrusion unit, which can not only ensure the quality of the board, but also ensure the performance of the composite roller.

[0005] According to one aspect of the embodiments of this application, a composite roller is provided, the composite roller comprising: a roller core; a coating layer covering the outer periphery of the roller core; and a nonwoven fabric roller sleeve sleeved on the coating layer and fixedly connected to the coating layer, the nonwoven fabric roller sleeve comprising multiple layers of stacked nonwoven fabric rings, the multiple layers of nonwoven fabric rings being formed into an integral structure by extrusion and heating, the nonwoven fabric roller sleeve rotating synchronously with the coating layer and the roller core.

[0006] In one alternative approach, a limiting groove is formed on the surface of the coating layer along its axial direction, and a limiting protrusion adapted to the limiting groove is provided on the inner side of the nonwoven roller sleeve along its axial direction. The limiting protrusion is engaged in the limiting groove so that the nonwoven roller sleeve and the coating layer are fixedly connected.

[0007] In one alternative approach, there are multiple limiting grooves, and the multiple limiting grooves are evenly arranged along the circumference of the coating layer. The inner side of the nonwoven fabric roller sleeve is provided with multiple limiting protrusions at positions corresponding to the multiple limiting grooves, and the multiple limiting protrusions are respectively engaged in the multiple limiting grooves.

[0008] In one alternative approach, there are four limiting grooves, which are arranged symmetrically in pairs, and four limiting protrusions are provided on the inner side of the nonwoven fabric roller sleeve, which are arranged symmetrically in pairs.

[0009] In one alternative approach, the inner ring of each nonwoven fabric ring is provided with a limiting protrusion. When multiple nonwoven fabric rings are stacked together, the limiting protrusions of each nonwoven fabric ring are stacked together. When multiple nonwoven fabric rings are formed into an integral structure by extrusion and heating, the limiting protrusions of the multiple nonwoven fabric rings form limiting protrusions.

[0010] In one alternative embodiment, the length of the nonwoven fabric roller sleeve along the axial direction is less than the length of the adhesive layer along the axial direction. A first limiting ring is fitted on each end of the adhesive layer. The outer diameter of the first limiting ring is larger than the inner diameter of the nonwoven fabric roller sleeve, and the first limiting ring abuts against the nonwoven fabric roller sleeve. A first annular limiting groove is formed on the side of the first limiting ring away from the nonwoven fabric roller sleeve at each end of the adhesive layer. A second limiting ring is engaged in each first annular limiting groove. The second limiting ring abuts against the first limiting ring to prevent the first limiting ring from detaching from the adhesive layer.

[0011] In one alternative embodiment, the first limiting ring has an annular recess at the inner edge of its side facing the second limiting ring, and a portion of the second limiting ring is located outside the first annular limiting groove and abuts against the annular recess.

[0012] In one alternative approach, a second annular limiting groove is provided at both ends of the roller core, and the rubber coating layer is wrapped around the outer periphery of the roller core by extrusion coating so that part of the rubber coating layer is engaged in the second annular limiting groove.

[0013] In one alternative embodiment, the roller core is provided with roller necks at both ends, each roller neck being supported on a bracket of the extrusion unit to fix the composite roller on the bracket, and the outer periphery of the roller neck is covered with an adhesive layer.

[0014] According to another aspect of the embodiments of this application, an extrusion unit is provided, including: a support and two composite rollers provided in any of the above embodiments; the two ends of each composite roller are respectively rotatably connected to the support, the two composite rollers are arranged opposite to each other, and a channel for the sheet material to pass through is formed between the two composite rollers.

[0015] In the composite roller provided in this application embodiment, a non-woven fabric roller sleeve is fitted onto the rubber coating layer covering the outer periphery of the roller core. This allows the non-woven fabric roller sleeve to rotate synchronously with the rubber coating layer and the roller core. This not only effectively protects the rubber coating layer from damage but also prevents aging of the rubber coating layer due to frictional heat generated between the non-woven fabric roller sleeve and the rubber coating layer. Furthermore, the non-woven fabric roller sleeve is formed by stacking multiple layers of acid-resistant non-woven fabric rings and forming an integral structure through extrusion and heating. This structure not only has high hardness but also corrosion resistance, reducing the risk of cracking. Thus, the non-woven fabric roller sleeve can prevent corrosive liquids from directly contacting or penetrating the rubber coating layer, slowing down the aging of the rubber coating layer and reducing its cracking. This prevents corrosive liquids from seeping into the roller core, ensuring the performance of the composite roller.

[0016] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0018] Figure 1(a) is a schematic diagram of the structure of the composite roller provided in the embodiment of this application;

[0019] Figure 1(b) is a magnified view of part A in Figure 1(a);

[0020] Figure 1(c) is a magnified view of part B in Figure 1(a);

[0021] Figure 2 This is a schematic diagram of the structure of the nonwoven fabric roller sleeve provided in the embodiments of this application;

[0022] Figure 3 A cross-sectional view of the composite roller provided in an embodiment of this application;

[0023] Figure 4 A cross-sectional view of the roller core and the rubber coating layer provided in the embodiments of this application;

[0024] Figure 5 This is a schematic diagram of the structure of the nonwoven ring provided in the embodiments of this application;

[0025] Figure 6 A cross-sectional view of the first limiting ring provided in an embodiment of this application;

[0026] Figure 7This is a schematic diagram of the extrusion unit provided in an embodiment of this application.

[0027] The reference numerals in the detailed embodiments are as follows:

[0028] 1. Extrusion unit; 10. Composite roller; 20. Support frame;

[0029] 100 Roller core; 110 Second annular limiting groove; 120 Roller neck; 121 Adhesive layer; 101 Channel; 200 Adhesive coating layer; 210 Limiting groove; 220 First limiting ring; 221 Annular recess; 230 First annular limiting groove; 240 Second limiting ring; 300 Non-woven fabric roller sleeve; 310 Non-woven fabric ring; 311 Limiting protrusion; 320 Limiting protrusion. Detailed Implementation

[0030] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0032] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0033] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0034] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0035] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0036] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and 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. Therefore, they should not be construed as limitations on the embodiments of this application.

[0037] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0038] The production of sheet metals such as aluminum, carbon steel, and stainless steel typically involves a process of hot rolling, pickling, and cold rolling. Taking stainless steel as an example, hot rolling utilizes the high plasticity and low deformation resistance of metals at high temperatures to roll steel billets, then trim and straighten them into steel sheets. Cold rolling is the process of hardening the hot-rolled steel sheets to increase their hardness. During hot rolling, impurities such as iron oxide scale and rust form on the surface of the steel sheet. Before cold rolling, the steel sheet needs to undergo a pickling process to remove these impurities and prevent them from being pressed into the steel sheet during cold rolling, which would reduce the quality of the steel sheet.

[0039] After pickling the board, pressure is applied to the upper and lower surfaces of the board by two squeezing rollers of the squeezing unit to squeeze the board tightly. The rollers rotate synchronously with the movement of the board to remove strong acid and other corrosive liquids from the surface of the board and prevent the corrosive liquids from entering the subsequent processes.

[0040] During this process, the squeeze roller comes into direct contact with corrosive liquids such as strong acids, which rapidly degrade the roller's performance. For example, when the squeeze roller is a rubber roller, the rubber layer on its surface, made of rubber or polymer materials, has relatively weak rigidity and is easily damaged during production. Furthermore, to improve the cleaning efficiency of the sheet, the temperature of corrosive liquids such as strong acids is usually increased to accelerate the reaction between the corrosive liquid and impurities. In this situation, the rubber layer comes into direct contact with the high-temperature corrosive liquid, accelerating aging. The aged rubber layer lacks elasticity and is prone to cracking when the roller rotates at high speed. Cracked rubber layers easily scratch the sheet, reducing its quality. Moreover, when the rubber layer cracks, corrosive liquid can easily seep into the roller core through the crack, corroding it and further reducing the roller's performance.

[0041] Based on this, this application provides a composite roller, which includes a roller core and a rubber coating layer. To reduce the risk of the rubber coating layer cracking, a non-woven fabric roller sleeve is provided. This non-woven fabric roller sleeve is made of multiple layers of non-woven fabric rings that are resistant to strong acids. The multiple layers of non-woven fabric rings are formed into an integral structure through extrusion and heating, which makes the non-woven fabric roller sleeve corrosion resistant and reduces the risk of cracking. By placing the non-woven fabric roller sleeve outside the rubber coating layer, it can not only prevent the board from damaging the rubber coating layer and ensuring the quality of the board, but also prevent corrosive liquids from directly contacting or penetrating into the rubber coating layer, slowing down the aging of the rubber coating layer, and thus reducing the cracking of the rubber coating layer. This prevents corrosive liquids from penetrating into the roller core and ensures the performance of the composite roller.

[0042] Please see Figure 1(a)-Figure 2 Figure 1(a) shows a schematic diagram of the composite roller provided in the embodiment of this application, Figure 1(b) is a partial enlarged view of part A in Figure 1(a), and Figure 1(c) is a partial enlarged view of part B in Figure 1(a). Figure 2 A schematic diagram of the structure of the nonwoven fabric roller sleeve provided in an embodiment of this application is shown. As shown in the figure, the composite roller 10 includes a roller core 100, a coating layer 200, and a nonwoven fabric roller sleeve 300. The coating layer 200 covers the outer periphery of the roller core 100. The nonwoven fabric roller sleeve 300 is sleeved on the coating layer 200 and fixedly connected to the coating layer 200. The nonwoven fabric roller sleeve 300 includes multiple layers of stacked nonwoven fabric rings 310. The multiple layers of nonwoven fabric rings 310 are formed into an integral structure by extrusion and heating. The nonwoven fabric roller sleeve 300 rotates synchronously with the coating layer 200 and the roller core 100.

[0043] The roller core 100 can be made of carbon structural steel. To reduce the production cost and weight of the composite roller 10, the roller core 100 can be a hollow structure.

[0044] The overlay 200 can be made of rubber material, such as nitrile rubber. The thickness of the overlay 200 can be set to 5 mm.

[0045] Specifically, the surface of the roller core 100 can first be sandblasted to thoroughly remove oil, rust, dust, and other impurities. Then, a metal adhesive can be applied to the surface of the roller core 100 to increase its mechanical gripping force. Finally, nitrile rubber can be applied to the surface of the roller core 100 by extrusion coating, followed by vulcanization. After vulcanization and cooling, machining is performed to obtain the roller core 100 covered with the rubber coating layer 200. Through the above methods, the rubber coating layer 200 can be wrapped around the outer periphery of the roller core 100, and the rubber coating layer 200 can be fixedly connected to the roller core 100 and rotate synchronously with the roller core 100.

[0046] As the composite roller 10 is used for an extended period, the adhesion between the rubber coating 200 and the roller core 100 may fail. During the rotation of the roller core 100, the rubber coating 200 may shift in the direction indicated by arrow x in Figure 1(a), causing the roller core 100 to be exposed to corrosive liquids. Therefore, to avoid the above situation, please refer to... Figure 1(a)-Figure 1(c) A second annular limiting groove 110 can be opened at both ends of the roller core 100. When the rubber coating layer 200 is coated on the outer periphery of the roller core 100 by extrusion, a portion of the rubber coating layer 200 can be engaged in the second annular limiting groove 110. In this way, the rubber coating layer 200 is engaged and fixed to the roller core 100. Even if the rubber coating layer 200 is no longer bonded to the roller core 100, the portion of the rubber coating layer 200 located in the second annular limiting groove 110 can still prevent the rubber coating layer from moving in the direction shown by arrow x, and continue to cover the roller core 100, protecting the roller core 100 from corrosion by corrosive liquids.

[0047] Specifically, the nonwoven ring 310 can be formed from a strong acid-resistant adhesive and a strong acid-resistant fiber, or by spraying a specific amount of adhesives such as polyvinyl alcohol, vinyl acetate alcohol, and acrylate onto fibers such as polyamide fibers (e.g., sprayed or impregnated), polyester fibers, and polyvinyl acetal fibers, or by impregnating the aforementioned fibers with a specific amount of the aforementioned adhesives. It has high hardness and good heat resistance and corrosion resistance, so that the nonwoven roller sleeve 300 has high hardness and good heat resistance and corrosion resistance.

[0048] In the manufacturing process of the nonwoven fabric roller sleeve 300, firstly, an extrusion mold for extruding the multi-layer nonwoven fabric roller sleeve 300, such as a mold roller similar to the roller core 100, is prepared according to the required specifications of the nonwoven fabric roller sleeve 300. Then, multi-layer nonwoven fabric rings 310 are cut according to the dimensions of the nonwoven fabric roller sleeve 300, and the required number of layers of the nonwoven fabric rings 310 is determined based on the dimensions or density of the nonwoven fabric roller sleeve 300. For example, assuming the required length L of the nonwoven fabric roller sleeve 300 is 100cm and the thickness of each layer of nonwoven fabric ring 310 is 1mm, the required number of layers of nonwoven fabric rings 310 can be determined to be 1000 layers. Next, the multi-layer nonwoven fabric rings 310 are sequentially inserted into the mold roller, causing the multi-layer nonwoven fabric rings 310 to stack together. Then, pressure is applied to the mold roller using a press, causing the adhesive in the multi-layer nonwoven fabric rings 310 to be extruded. Next, the extruded multilayer nonwoven fabric rings 310 are baked, and the adhesive between the multilayer nonwoven fabric rings 310 is cured, bonding adjacent nonwoven fabric rings 310 together to form a single integrated structure. Finally, after the integrated multilayer nonwoven fabric rings 310 are cooled, they are placed on a press machine to extrude the integrated multilayer nonwoven fabric rings 310 from the die rollers, thus obtaining the nonwoven fabric roller sleeve 300.

[0049] In this way, the gaps between the multiple nonwoven rings 310 of the nonwoven roller sleeve 300 are reduced, and the contact area between the fibers of adjacent nonwoven rings 310 is increased. This results in the fibers of adjacent nonwoven rings 310 forming a tighter network structure, improving the rigidity and deformation resistance of each layer of nonwoven rings 310, thereby increasing the hardness of the nonwoven roller sleeve 300. Furthermore, the multiple layers of nonwoven rings 310 are adhered to each other, making them less prone to separation and reducing the risk of cracking of the nonwoven roller sleeve 300.

[0050] On the press, the nonwoven fabric roller sleeve 300 is fitted onto the rubber-coated layer 200 through an interference fit, thus fixing the nonwoven fabric roller sleeve 300 to the rubber-coated layer 200 and preventing it from detaching from the rubber-coated layer 200. This ensures the synchronous rotation of the nonwoven fabric roller sleeve 300, the rubber-coated layer 200, and the roller core 100. The nonwoven fabric roller sleeve 300 can be snapped onto the rubber-coated layer 200; the specific snapping method will be described below and will not be elaborated here.

[0051] After the nonwoven fabric roller sleeve 300 is fitted onto the rubber coating layer 200, the surface of the nonwoven fabric roller sleeve 300 is subjected to rough turning, fine turning, grinding and polishing processes in sequence to finally obtain the composite roller 10.

[0052] The composite roller 10 has a non-woven fabric roller sleeve 300 covering the rubber coating layer 200. The non-woven fabric roller sleeve 300 protects the rubber coating layer 200 from being damaged by other objects. Furthermore, the one-piece non-woven fabric roller sleeve 300 has high hardness, good heat resistance, and corrosion resistance, which reduces the risk of being broken. It will not dissolve, swell, or crack even when in direct contact with corrosive liquids such as strong acids. It not only maintains precise dimensions and shape, preventing the board from shifting or affecting the board quality due to the deformation of the composite roller 10, but also reduces the risk of cracking of the non-woven fabric roller sleeve 300. It effectively prevents corrosive liquids from penetrating into the rubber coating layer 200, avoids direct contact between corrosive liquids and the rubber coating layer 200, slows down the aging of the rubber coating layer 200, and thus reduces the cracking of the rubber coating layer 200.

[0053] Furthermore, due to the porous nature of the nonwoven fabric ring 310, the nonwoven fabric roller sleeve 300 possesses the same characteristic, allowing impurities to be absorbed into the inner surface layer during use, preventing damage to the substrate. In this case, when the inner surface layer of the nonwoven fabric roller sleeve 300 absorbs a significant amount of impurities, it can be machined away, allowing the nonwoven fabric roller sleeve 300 to be reused, thus improving its utilization rate. Further, after repeated machining and thinning of the nonwoven fabric roller sleeve 300, corrosive liquids can seep into the coating layer 200. The coating layer 200 also prevents corrosive liquids from entering the roller core 100, protecting it from corrosion. Thus, by machining or replacing the nonwoven fabric roller sleeve 300, the roller core 100 covered with the coating layer 200 can be reused repeatedly, reducing the production cost of the composite roller 10.

[0054] In the composite roller 10 provided in this embodiment, a nonwoven fabric roller sleeve 300 is fitted onto the rubber coating layer 200 covering the outer periphery of the roller core 100. This allows the nonwoven fabric roller sleeve 300 to rotate synchronously with the rubber coating layer 200 and the roller core 100. This not only effectively protects the rubber coating layer 200 from damage and ensures the quality of the board, but also prevents the rubber coating layer 200 from aging due to frictional heat generated between the nonwoven fabric roller sleeve 300 and the rubber coating layer 200. Furthermore, the nonwoven fabric roller sleeve 300 is formed by stacking multiple layers of acid-resistant nonwoven fabric rings 310 and forming an integral structure through extrusion and heating. This structure not only has high hardness but also corrosion resistance, reducing the risk of cracking. Thus, the nonwoven fabric roller sleeve 300 can prevent corrosive liquids from directly contacting or penetrating the rubber coating layer 200, slowing down the aging of the rubber coating layer 200 and reducing its cracking. This prevents corrosive liquids from penetrating the roller core 100 and ensures the performance of the composite roller 10.

[0055] To achieve synchronous rotation of the nonwoven fabric roller sleeve 300, the adhesive layer 200, and the roller core 100, this application further provides an embodiment. Optionally, please continue to refer to Figure 1(a) and combine it with... Figure 3 and Figure 4 , Figure 3 A cross-sectional view of the composite roller provided in an embodiment of this application is shown. Figure 4 A cross-sectional view of the roller core and the coating layer provided in the embodiment of this application is shown. As shown in the figure, the surface of the coating layer 200 has a limiting groove 210 along its axial direction (indicated by arrow x in Figure 1(a)). The inner side of the nonwoven roller sleeve 300 is provided with a limiting protrusion 320 that matches the limiting groove 210 along its axial direction. The limiting protrusion 320 is engaged in the limiting groove 210 so that the nonwoven roller sleeve 300 is fixedly connected to the coating layer 200.

[0056] Specifically, the limiting protrusion 320 of the nonwoven fabric roller sleeve 300 is aligned with the limiting groove 210 on the rubber coating layer 200, and the limiting protrusion 320 is pushed into the limiting groove 210 through interference fit, so that the nonwoven fabric roller sleeve 300 and the rubber coating layer 200 can be snapped and fixed, ensuring that the nonwoven fabric roller sleeve 300 and the rubber coating layer 200 can rotate synchronously.

[0057] Optionally, multiple limiting grooves 210 can be evenly formed along the circumference of the coating layer 200, and multiple limiting protrusions 320 can be provided on the inner side of the nonwoven fabric roller sleeve 300 at positions corresponding to the multiple limiting grooves 210, so that the multiple limiting grooves 210 and the multiple limiting protrusions 320 correspond one-to-one. By engaging the multiple limiting protrusions 320 into the multiple limiting grooves 210 respectively, the nonwoven fabric roller sleeve 300 can be engaged with multiple positions of the coating layer 200, thereby improving the connection stability between the nonwoven fabric roller sleeve 300 and the coating layer 200. Furthermore, during the processing, due to errors, one of the limiting grooves 210 on the overlay layer 200 may become larger, resulting in a gap between the limiting groove 210 and the limiting protrusion 320. By opening multiple limiting grooves 210, other limiting grooves 210 can also be interference-fitted with other limiting protrusions 320 when the above situation occurs, thereby improving the tolerance of processing errors.

[0058] For example, it can be like Figure 4 As shown, four limiting grooves 210 are formed on the surface of the adhesive layer 200, such as... Figure 3As shown, four limiting protrusions 320 are provided on the inner side of the nonwoven fabric roller sleeve 300. The four limiting grooves 210 and the four limiting protrusions 320 are symmetrically arranged in pairs, making it easier for the multiple limiting protrusions 320 of the nonwoven fabric roller sleeve 300 to align with the multiple limiting grooves 210 of the coating layer 200, allowing the nonwoven fabric roller sleeve 300 to be quickly fitted onto the coating layer 200. Furthermore, the symmetrical pairwise contact points between the nonwoven fabric roller sleeve 300 and the coating layer 200 result in a more uniform pressure distribution on the surface of the coating layer 200, reducing the amount of deformation caused by localized compression. Additionally, the torque transmission between the nonwoven fabric roller sleeve 300 and the coating layer 200 is transformed from a single friction-dependent process to a multi-path mechanical interlock, resulting in a more uniform shear force distribution and preventing relative sliding between the coating layer 200 and the nonwoven fabric roller sleeve 300. Of course, in order to save processing time of the rubber coating layer 200, two limiting grooves 210 can be symmetrically opened on the surface of the rubber coating layer 200, and two limiting protrusions 320 can be symmetrically set on the inner side of the nonwoven fabric roller sleeve 300.

[0059] To reduce the processing difficulty of the nonwoven fabric roller sleeve 300, this application further provides an embodiment. Optionally, please refer to... Figure 2 and combined Figure 5 , Figure 5 A schematic diagram of the structure of the nonwoven ring provided in the embodiment of this application is shown. As shown in the figure, the inner ring of each layer of nonwoven ring 310 is provided with a limiting protrusion 311. When multiple layers of nonwoven ring 310 are stacked together, the limiting protrusions 311 of each layer of nonwoven ring 310 are stacked together. When multiple layers of nonwoven ring 310 are formed into an integral structure by extrusion and heating, the limiting protrusions 311 of multiple layers of nonwoven ring 310 form limiting protrusions 320.

[0060] After the multi-layer nonwoven fabric ring 310 is formed into an integral structure by extrusion and heating, a limiting protrusion 320 is formed on the inner side of the nonwoven fabric roller sleeve 300 through other processes. The nonwoven fabric roller sleeve 300 is long and has high hardness, making it extremely difficult to process.

[0061] Since it is relatively easy to cut the limiting protrusions 311 into each layer of nonwoven fabric ring 310, by stacking the nonwoven fabric rings 310 with limiting protrusions 311 on the inner rings of the multi-layer nonwoven fabric rings 310, aligning and stacking the limiting protrusions 311 of the multi-layer nonwoven fabric rings 310, and then forming limiting protrusions 320 by extrusion and heating of the limiting protrusions 311 of the multi-layer nonwoven fabric rings 310, the processing difficulty of the nonwoven fabric roller sleeve 300 can be reduced and the production efficiency of the nonwoven fabric roller sleeve 300 can be improved.

[0062] Preferably, a groove corresponding to the limiting protrusion 311 can be formed on the mold roller to facilitate the alignment of the limiting protrusion 311 of the multi-layer nonwoven fabric ring, improve the forming efficiency of the limiting protrusion 320, and improve the accuracy of the shape and size of the limiting protrusion 320.

[0063] To prevent the nonwoven fabric roller sleeve 300 from detaching from the adhesive layer 200, this application further provides an embodiment; optionally, please refer to [the following embodiment]. Figure 1(a)-Figure 1(c) As shown in the figure, the length L of the nonwoven fabric roller sleeve 300 along the axial direction (in the direction indicated by arrow x in Figure 1(a)) is less than the length l of the adhesive layer 200 along the axial direction. A first limiting ring 220 is fitted on each end of the adhesive layer 200. The outer ring diameter D1 of the first limiting ring 220 is greater than the inner ring diameter d1 of the nonwoven fabric roller sleeve 300, and the first limiting ring 220 abuts against the nonwoven fabric roller sleeve 300. A first annular limiting groove 230 is formed on the side of the first limiting ring 220 away from the nonwoven fabric roller sleeve 300 at each end of the adhesive layer 200. A second limiting ring 240 is engaged in each first annular limiting groove 230. The second limiting ring 240 abuts against the first limiting ring 220 to prevent the first limiting ring 220 from detaching from the adhesive layer 200.

[0064] The first limiting ring 220 abuts against the nonwoven fabric roller sleeve 300, which can prevent the nonwoven fabric roller sleeve 300 from moving in the direction shown by arrow x, reduce the displacement of the nonwoven fabric roller sleeve 300 relative to the adhesive layer 200, and prevent the nonwoven fabric roller sleeve 300 from detaching from the adhesive layer 200.

[0065] To engage the second limiting ring 240 with the first annular limiting groove 230, the second limiting ring 240 is typically divided into two evenly spaced semi-ring structures. These two semi-ring structures engage with the first annular limiting groove 230 respectively, allowing for quick engagement of the second limiting ring 240. The outer ring diameter D2 of the second limiting ring 240 can be larger than the inner ring diameter d2 of the first limiting ring 220 (i.e., the inner ring diameter d1 of the nonwoven fabric roller sleeve 300). When the first limiting ring 220 moves in the direction indicated by arrow x, the second limiting ring 240 abuts against it. Since the first annular limiting groove 230 prevents the second limiting ring 240 from moving in the direction indicated by arrow x, the second limiting ring 240 prevents the first limiting ring 220 from detaching from the coating layer 200, thereby preventing the nonwoven fabric roller sleeve 300 from detaching from the coating layer 200.

[0066] To improve the stability of the second limiting ring 240, this application further provides an implementation method. Optionally, please refer to [further details omitted]. Figure 1(a)-Figure 1(c) and combined Figure 6 , Figure 6 A cross-sectional view of the first limiting ring provided in the embodiment of this application is shown. As shown in the figure, the first limiting ring 220 has an annular recess 221 at the inner ring edge on the side facing the second limiting ring 240. A part of the second limiting ring 240 is located outside the first annular limiting groove 230 and abuts against the annular recess 221.

[0067] As shown in Figure 1(c), the outer ring diameter D2 of the second limiting ring 240 is larger than the outer ring diameter of the adhesive layer 200 (that is, the inner ring diameter d2 of the first limiting ring 220), so that a part of the second limiting ring 240 can be located outside the first annular limiting groove 230 and abut against the annular recess 221, so as to prevent the first limiting ring 220 from moving in the direction indicated by arrow x and to prevent the first limiting ring 220 from detaching from the adhesive layer 200.

[0068] During operation, the composite roller 10 rotates at high speed, and during this process, the nonwoven fabric roller sleeve 300 is prone to movement in the direction indicated by arrow x. Therefore, the second limiting ring 240 is easily subjected to axial impact force. When the second limiting ring 240 is composed of two semi-ring structures, under the action of impact force, the two semi-ring structures are prone to disengage from the first annular limiting groove 230.

[0069] When the first limiting ring 220 wraps around the second limiting ring 240 as shown in Figure 1(b), the first limiting ring 220 and the second limiting ring 240 form a "hoop effect". The first limiting ring 220 can constrain the radial deformation of the second limiting ring 240, preventing the second limiting ring 240 from detaching from the first annular limiting groove 230, so that the second limiting ring 240 can always constrain the displacement of the first limiting ring 220.

[0070] To mount the composite roller 10 on the extrusion unit, please refer to Figure 1(a). As shown, roller necks 120 can be provided at both ends of the roller core 100. Each roller neck 120 is used to support the frame of the extrusion unit to fix the composite roller 10 on the frame. In corrosive environments such as strong acids, to prevent the roller necks 120 from being corroded by corrosive liquids and affecting the normal operation of the composite roller 10, an adhesive layer 121 is coated on the outer periphery of the roller necks 120. The adhesive layer 121 can be as shown in Figure 1- Figure 3 The 200-layer coating shown here will not be described in detail here.

[0071] This application also provides an extrusion drying unit. Please refer to [link to relevant documentation]. Figure 7 , Figure 7 A schematic diagram of the extrusion unit provided in an embodiment of this application is shown. As shown in the figure, the extrusion unit 1 includes a support 20 and two composite rollers 10 provided in any of the above embodiments. Both ends of each composite roller 10 are rotatably connected to the support 20. The two composite rollers 10 are arranged opposite to each other, and a channel 101 for the board material to pass through is formed between the two composite rollers 10. Specifically, multiple bearing seats can be provided on the support 20, and the roller necks 120 at both ends of the composite roller 10 can be mounted on the bearing seats. This allows the composite roller 10 to be mounted on the support 20 and rotate on the support 20, so that it rotates synchronously when the board material moves, continuously squeezing the upper and lower surfaces of the board material to remove corrosive liquids such as strong acids from the surface of the board material.

Claims

1. A composite roller, characterized in that, The composite roller includes: Roller core; A rubber coating layer is provided on the outer periphery of the roller core; A nonwoven fabric roller sleeve is fitted onto the coating layer and fixedly connected to the coating layer. The nonwoven fabric roller sleeve includes multiple layers of stacked nonwoven fabric rings. The multiple layers of nonwoven fabric rings are formed into an integral structure by extrusion and heating. The nonwoven fabric roller sleeve rotates synchronously with the coating layer and the roller core.

2. The composite roll of claim 1, wherein The surface of the coating layer is provided with a limiting groove along its axial direction, and the inner side of the nonwoven roller sleeve is provided with a limiting protrusion that matches the limiting groove along its axial direction. The limiting protrusion is engaged in the limiting groove so that the nonwoven roller sleeve is fixedly connected to the coating layer.

3. The composite roll of claim 2, wherein, The number of the limiting grooves is multiple, and the multiple limiting grooves are evenly arranged along the circumference of the coating layer. The inner side of the nonwoven fabric roller sleeve is provided with multiple limiting protrusions at positions corresponding to the multiple limiting grooves, and the multiple limiting protrusions are respectively engaged in the multiple limiting grooves.

4. The composite roll of claim 3, wherein The number of limiting grooves is four, and the four limiting grooves are arranged symmetrically in pairs. The inner side of the nonwoven fabric roller sleeve is provided with four limiting protrusions, and the four limiting protrusions are arranged symmetrically in pairs.

5. The composite roll of claim 2 wherein, Each layer of the nonwoven fabric ring has a limiting protrusion on its inner ring. When multiple layers of nonwoven fabric rings are stacked together, the limiting protrusions of each layer of nonwoven fabric rings are stacked together. When multiple layers of nonwoven fabric rings are formed into an integral structure by extrusion and heating, the limiting protrusions of multiple layers of nonwoven fabric rings form the limiting protrusion.

6. The composite roll of claim 1 wherein, The length of the nonwoven fabric roller sleeve along the axial direction is less than the length of the adhesive layer along the axial direction. A first limiting ring is sleeved on each end of the adhesive layer. The outer ring diameter of the first limiting ring is greater than the inner ring diameter of the nonwoven fabric roller sleeve, and the first limiting ring abuts against the nonwoven fabric roller sleeve. Each end of the adhesive layer has a first annular limiting groove on the side of the first limiting ring away from the nonwoven fabric roller sleeve. A second limiting ring is engaged in each of the first annular limiting grooves. The second limiting ring abuts against the first limiting ring to prevent the first limiting ring from detaching from the adhesive layer.

7. The composite roll of claim 6 wherein, The first limiting ring has an annular recess on the inner edge of the ring facing the second limiting ring, and a portion of the second limiting ring is located outside the first annular limiting groove and abuts against the annular recess.

8. The composite roll of claim 6 wherein, The roller core has a second annular limiting groove at both ends. The rubber coating layer is wrapped around the outer periphery of the roller core by extrusion coating so that part of the rubber coating layer is engaged in the second annular limiting groove.

9. The composite roll of claim 1 wherein, The roller core has roller necks at both ends. Each roller neck is used to support the frame of the extrusion unit to fix the composite roller on the frame. The outer periphery of the roller neck is covered with an adhesive layer.

10. A wringer assembly characterized in that, The extrusion unit includes: a support frame and two composite rollers as described in any one of claims 1-9; Each of the composite rollers is rotatably connected to the support at both ends. The two composite rollers are arranged opposite to each other, and a channel for the plate to pass through is formed between the two composite rollers.

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