A corrosion and wear resistant tungsten carbide coated roll

Abstract

The utility model relates to industrial roller technology field especially is a kind of anticorrosive wear-resistant tungsten carbide coating roll, including roller shaft subassembly and the roller cylinder subassembly of detachable installation in the external roller shaft subassembly;The roller shaft subassembly includes shaft, and shaft is fixed with the roller shaft main part and positioning plate, and positioning plate is located at one end of roller shaft main part;The roller cylinder subassembly includes roller cylinder main body, and the roller cylinder main body is detachably installed on roller shaft main body, and one end of the roller cylinder main body is fixedly connected with pull block, and the outer surface of the roller cylinder main body is provided with composite coating.The utility model discloses a kind of anticorrosive wear-resistant tungsten carbide coating roll, and the wear resistance and corrosion resistance of roller cylinder are effectively improved by setting composite coating, prolong the service life;While using detachable modular structure design, it is convenient to quickly install and replace, improve maintenance efficiency, reduce use cost, with good application prospect.

Description

Technical Field

[0001] This utility model relates to the field of industrial roller technology, and in particular to a corrosion-resistant and wear-resistant tungsten carbide coated roller. Background Technology

[0002] In existing technologies, industrial rollers are typically made of ordinary steel or stainless steel, which are susceptible to wear and corrosion during long-term use, leading to shortened equipment lifespan and reduced production efficiency. To address this issue, some companies spray hard alloy materials such as tungsten carbide onto the roller surface to enhance its wear resistance. However, traditional spraying processes suffer from poor adhesion, easy coating peeling, and insufficient corrosion resistance, failing to meet the demands of complex operating conditions. Therefore, we propose a corrosion-resistant and wear-resistant tungsten carbide coated roller. Utility Model Content

[0003] The main objective of this invention is to provide a corrosion-resistant and wear-resistant tungsten carbide coated roller, which can effectively solve the problems in the background art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A corrosion-resistant and wear-resistant tungsten carbide coated roller includes a roller shaft assembly and a roller assembly detachably mounted outside the roller shaft assembly; the roller shaft assembly includes a rotating shaft, on which a roller shaft body and a positioning plate are fixedly sleeved, with the positioning plate located at one end of the roller shaft body; the roller assembly includes a roller body, which is detachably mounted on the roller shaft body, with a pull block fixedly connected to one end of the roller body, and a composite coating is provided on the outer surface of the roller body.

[0006] Preferably, the outer surface of the roller body is provided with a plurality of keyways in an annular shape, the roller body is a hollow structure, and the inner surface of the roller body is integrally formed with a plurality of rectangular keys that are slidably connected to the keyways. The rectangular keys are slidably connected to the corresponding keyways to slide the roller body onto the roller body.

[0007] By adopting the above technical solution, multiple keyways evenly distributed along the circumference are set on the outer circumference of the roller body, and multiple matching rectangular keys are integrally formed on the inner wall of the roller body, the sliding insertion assembly between the roller assembly and the roller shaft assembly is realized. This structure of rectangular key and keyway not only ensures the synchronous transmission performance of the roller assembly during rotation, but also effectively avoids the problems of loosening and slippage of traditional flat key connections, thus improving the stability and reliability of transmission.

[0008] Preferably, the positioning plate has three positioning grooves arranged in a circular array, and the roller body has three positioning blocks integrally formed at one end near the positioning plate that engage with the positioning grooves.

[0009] By adopting the above technical solution: by setting three positioning grooves in a ring on the positioning plate and integrally forming three positioning blocks at the corresponding positions at one end of the roller body, the roller assembly can be axially limited by the precise engagement of the positioning blocks and positioning grooves after installation. This design not only improves the stability of the roller assembly during operation, but also effectively prevents axial movement caused by vibration or load changes, ensuring the safety and accuracy of equipment operation.

[0010] Preferably, the length of the roller body is equal to the length of the roller shaft body, and the pull block is located at the end of the rotating shaft away from the positioning plate.

[0011] By adopting the above technical solution: the length of the roller body is designed to be consistent with that of the roller shaft body, ensuring that the roller assembly completely covers the roller shaft body and maintains good symmetry and force balance; at the same time, the pull block is located at the end of the roller assembly away from the positioning plate and is set directly opposite the end of the rotating shaft, making it convenient for operators to apply force from this end for disassembly operations. This structural design is reasonable, ensuring both the compactness of the overall assembly and improving the convenience of operation during maintenance and replacement.

[0012] Preferably, the middle part of the pull block has a through hole that matches the inner diameter of the rotating shaft, and the end of the pull block away from the roller body has two symmetrical grooves.

[0013] By adopting the above technical solution: the pull block has a through hole in the middle that matches the diameter of the rotating shaft, allowing the pull block to be fitted onto the end of the rotating shaft without affecting its rotation function; at the same time, two symmetrical locking slots are opened on the side of the pull block away from the roller body, allowing operators to apply pulling force with their fingers or tools, thereby achieving quick disassembly and replacement of the roller assembly. This design greatly simplifies the maintenance process and improves the maintainability and efficiency of the equipment.

[0014] Preferably, the composite coating includes a nickel-chromium alloy layer coated on the outer surface of the roller body, a tungsten carbide coating coated on the outer surface of the nickel-chromium alloy layer, and a nano-ceramic sealing layer coated on the outer surface of the tungsten carbide coating.

[0015] By adopting the above technical solution, three functional coatings are sequentially applied to the surface of the roller body: the bottom layer is a nickel-chromium alloy layer, which is used to enhance the bonding strength between the substrate and subsequent coatings; the middle layer is a tungsten carbide coating, which has high hardness and excellent wear resistance and is the main functional layer; the top layer is a nano-ceramic sealing layer, which is used to seal micropores, improve density, reduce the coefficient of friction and enhance corrosion resistance. The three layers work together to form a composite protection system with excellent comprehensive performance.

[0016] Preferably, the thickness of the nickel-chromium alloy layer is 20-50µm, the thickness of the tungsten carbide coating is 100-500µm, and the thickness of the nano-ceramic sealing layer is 5-20µm.

[0017] By adopting the above technical solution: the nickel-chromium alloy layer is controlled between 20 and 50 µm, which provides sufficient bonding strength without causing internal stress cracking due to excessive thickness; the tungsten carbide coating, as the main wear-resistant layer, is set at a thickness of 100–500 µm to meet wear resistance requirements under different working conditions; and the nano-ceramic sealing layer is controlled within the range of 5–20 µm, ensuring its density and surface smoothness without affecting the overall coating adhesion. This thickness range has been verified through multiple tests, enabling an economical and stable spraying process application while ensuring performance.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. By applying a composite coating consisting of a nickel-chromium alloy layer, a tungsten carbide coating, and a nano-ceramic sealing layer to the outer surface of the roller body, a multi-layer synergistic protection system is formed. The nickel-chromium alloy layer serves as the base layer, enhancing the adhesion between the coating and the substrate; the tungsten carbide coating possesses high hardness and excellent wear resistance, effectively resisting wear caused by long-term friction; while the nano-ceramic sealing layer seals micropores, reduces the coefficient of friction, and enhances corrosion resistance. This composite coating structure enables the roller to operate stably under complex conditions such as high temperature, high pressure, and acid / alkali, significantly extending the service life of the equipment.

[0020] 2. This utility model adopts a modular design, making the roller assembly a detachable structure. The circumferential transmission is achieved through rectangular keys and keyways, while the axial positioning is achieved through positioning blocks and positioning slots. The design of pull blocks and snap slots further improves the disassembly and assembly efficiency, allowing the roller assembly to be quickly replaced without tools. This structure not only improves the stability of equipment operation but also reduces maintenance costs, facilitates standardized production and on-site replacement, and is particularly suitable for industrial scenarios that require frequent replacement or maintenance. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a corrosion-resistant and wear-resistant tungsten carbide coated roller according to the present invention.

[0022] Figure 2 This is a schematic diagram of the composition and structure of a corrosion-resistant and wear-resistant tungsten carbide coated roller according to the present invention.

[0023] Figure 3 This is a schematic diagram of the main body of the anti-corrosion and wear-resistant tungsten carbide coated roller of this utility model;

[0024] Figure 4 This is a schematic diagram of the composition and structure of the composite coating of the anti-corrosion and wear-resistant tungsten carbide coated roller of this utility model.

[0025] In the figure: 1. Roller assembly; 2. Roller assembly; 3. Rotating shaft; 4. Roller body; 41. Keyway; 5. Positioning plate; 51. Positioning groove; 6. Roller body; 61. Rectangular key; 62. Positioning block; 7. Pull block; 71. Through hole; 72. Clip groove; 8. Composite coating; 81. Nickel-chromium alloy layer; 82. Tungsten carbide coating; 83. Nano-ceramic sealing layer. Detailed Implementation

[0026] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0027] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not 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 this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] Please see Figure 1-4 This utility model provides a technical solution:

[0030] A corrosion-resistant and wear-resistant tungsten carbide coated roller includes a roller shaft assembly 1 and a roller assembly 2 detachably mounted on the outside of the roller shaft assembly 1. The roller shaft assembly 1 includes a rotating shaft 3, on which a roller shaft body 4 and a positioning plate 5 are fixedly sleeved, and the positioning plate 5 is located at one end of the roller shaft body 4. The roller assembly 2 includes a roller body 6, which is detachably mounted on the roller shaft body 4. A pull block 7 is fixedly connected to one end of the roller body 6, and a composite coating 8 is provided on the outer surface of the roller body 6.

[0031] In this embodiment, the outer surface of the roller body 4 is provided with multiple keyways 41 in an annular shape. The roller body 6 is a hollow structure, and the inner surface of the roller body 6 is integrally formed with multiple rectangular keys 61 that are slidably connected to the keyways 41. The rectangular keys 61 are slidably connected to the corresponding keyways 41 to slide the roller body 6 onto the roller body 4. The positioning plate 5 is provided with three positioning grooves 51 in an annular array. The roller body 6 near the positioning plate 5 is integrally formed with three positioning blocks 62 that are engaged with the positioning grooves 51. The length of the roller body 6 is equal to the length of the roller body 4. The pull block 7 is located at the end of the rotating shaft 3 away from the positioning plate 5. The middle of the pull block 7 is provided with a through hole 71 that matches the inner diameter of the rotating shaft 3. The pull block 7 is provided with two symmetrical buckle grooves 72 at the end away from the roller body 6.

[0032] Through the above scheme: Roller assembly 1, as the driving and supporting part of the entire roller body, mainly includes a central rotating shaft 3, on which a roller body 4 and a positioning plate 5 are fixedly sleeved. The roller body 4 supports the roller assembly 2 and achieves a transmission connection with the roller assembly 2 through multiple keyways 41 on its outer surface. The positioning plate 5 is located at one end of the roller body 4, serving as an axial limit. Roller assembly 2 is the core component directly involved in production operations, including a hollow roller body 6 with multiple rectangular keys 61 integrally formed on its inner wall. These rectangular keys 61 can form a sliding fit with the keyways 41 on the roller body 4, allowing the roller body 6 to slide axially onto the roller body 4, achieving circumferential synchronous rotation. This provides higher centering and transmission stability, effectively preventing slippage or offset of the roller during high-speed operation. To further ensure the axial stability of roller assembly 2 and avoid slippage... If any movement or jumping occurs during the process, three positioning blocks 62 are provided at the end of the roller body 6 near the positioning plate 5. These positioning blocks 62 match the three positioning grooves 51 arranged in a ring on the positioning plate 5. When the roller assembly 2 is fully installed, the positioning blocks 62 will accurately engage in the corresponding positioning grooves 51, thereby completing the precise axial positioning and fixing, and ensuring that the roller maintains a good operating condition during operation. In addition, in order to facilitate the disassembly and replacement of the roller assembly 2, a pull block 7 is provided at the end of the roller body 6 away from the positioning plate 5. The pull block 7 has a through hole 71 in the middle that matches the outer diameter of the rotating shaft 3, so that the pull block 7 can be tightly fitted onto the end of the rotating shaft 3 without affecting the normal rotation of the roller assembly 2. On the side of the pull block 7 away from the roller body 6, two retaining grooves 72 are symmetrically provided. The operator can apply outward pulling force through these two retaining grooves 72 to smoothly pull the entire roller assembly 2 out of the roller shaft assembly 1, achieving quick replacement.

[0033] In this embodiment, the composite coating 8 includes a nickel-chromium alloy layer 81 coated on the outer surface of the roller body 6, a tungsten carbide coating 82 coated on the outer surface of the nickel-chromium alloy layer 81, and a nano-ceramic sealing layer 83 coated on the outer surface of the tungsten carbide coating 82; the thickness of the nickel-chromium alloy layer 81 is 20-50µm, the thickness of the tungsten carbide coating 82 is 100-500µm, and the thickness of the nano-ceramic sealing layer 83 is 5-20µm.

[0034] Through the above scheme, the composite coating 8 consists of a three-layer structure: a nickel-chromium alloy layer 81 with a thickness of 20-50µm, which serves as the base layer and is uniformly coated on the surface of the roller body 6 using plasma spraying technology. It has good corrosion resistance and high bonding strength, providing a solid foundation for subsequent coatings; a tungsten carbide coating 82 with a thickness of 100-500µm, which is the main wear-resistant layer in the composite coating. It is formed by supersonic flame spraying (HVOF) process and has extremely high hardness and wear resistance, effectively resisting the wear caused by material friction; and a nano-ceramic sealing layer 83 with a thickness of 5-20µm, which is applied to the tungsten carbide coating using sol-gel method or chemical vapor deposition technology. It is mainly used to seal the micropores on the coating surface, improve density, enhance corrosion resistance, and reduce the coefficient of friction, making the roller run more smoothly. The synergistic effect of the above three layers gives the roller assembly 2 excellent wear resistance, corrosion resistance, and self-lubricating properties, enabling it to operate stably under various complex working conditions such as high temperature, high pressure, and acid and alkali corrosion, greatly extending the service life of the equipment.

[0035] It should be noted that this utility model is a corrosion-resistant and wear-resistant tungsten carbide coated roller. The overall structure includes two main parts: a roller shaft assembly 1 and a detachable roller assembly 2. This structural design not only improves the performance of the equipment but also greatly facilitates maintenance and replacement operations. During use, the roller shaft assembly 1 serves as the driving and supporting part of the entire roller body. It mainly includes a central rotating shaft 3, on which a roller shaft body 4 and a positioning plate 5 are fixedly sleeved. The roller shaft body 4 carries the roller assembly 2 and achieves a transmission connection with the roller assembly 2 through multiple keyways 41 on its outer surface. The positioning plate 5 is located at one end of the roller shaft body 4 and serves as an axial limit. The roller assembly 2 is the core component that directly participates in the production operation. It includes a hollow roller body 6, whose inner wall is integrally formed with multiple rectangular keys 61. These rectangular keys 61 can form a sliding fit with the keyways 41 on the roller shaft body 4, so that the roller body 6 can slide axially onto the roller shaft body 4, achieving circumferential synchronous rotation. This provides higher centering and transmission stability and effectively prevents the roller from slipping. During high-speed operation, slippage or misalignment may occur. To further ensure the axial stability of the roller assembly 2 and prevent axial movement or jumping during operation, three positioning blocks 62 are provided at one end of the roller body 6 near the positioning plate 5. These positioning blocks 62 match three positioning grooves 51 arranged in a circular array on the positioning plate 5. When the roller assembly 2 is fully installed, the positioning blocks 62 will accurately engage with the corresponding positioning grooves 51, thereby completing precise axial positioning and fixation, ensuring the roller maintains a good operating condition during operation. In addition, to facilitate the disassembly and replacement of the roller assembly 2, a pull block 7 is provided at the end of the roller body 6 away from the positioning plate 5. The pull block 7 has a through hole 71 in the middle that matches the outer diameter of the rotating shaft 3, so that the pull block 7 can be tightly fitted onto the end of the rotating shaft 3 without affecting the normal rotation of the roller assembly 2. On the side of the pull block 7 away from the roller body 6, two locking slots 72 are symmetrically provided. The operator can apply outward pulling force through these two locking slots 72 to smoothly pull the entire roller assembly 2 out of the roller shaft assembly 1, so as to achieve quick replacement.At the functional level, the outer surface of the roller assembly 2 is coated with a composite coating 8, which is a set of functional material layers with excellent comprehensive performance. Specifically, the composite coating 8 consists of a three-layer structure: a nickel-chromium alloy layer 81 with a thickness of 20-50µm, which serves as the base layer and is uniformly coated on the surface of the roller body 6 using plasma spraying technology. It has good corrosion resistance and high bonding strength, providing a solid foundation for subsequent coatings; a tungsten carbide coating 82 with a thickness of 100-500µm, which is the main wear-resistant layer in the composite coating. It is formed by supersonic flame spraying (HVOF) process and has extremely high wear resistance. The hardness and wear resistance effectively resist the wear caused by material friction; the nano-ceramic sealing layer 83, with a thickness of 5-20μm, is applied to the tungsten carbide coating using sol-gel method or chemical vapor deposition technology. It is mainly used to seal the micropores on the coating surface, improve density, enhance corrosion resistance, and reduce the coefficient of friction, making the roller run more smoothly. The synergistic effect of the above three layers gives the roller assembly 2 excellent wear resistance, corrosion resistance, and self-lubricating properties, enabling it to operate stably under various complex working conditions such as high temperature, high pressure, and acid and alkali corrosion, greatly extending the service life of the equipment.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A corrosion-resistant and wear-resistant tungsten carbide coated roller, characterized in that: The roller assembly includes a roller shaft assembly (1) and a roller assembly (2) detachably mounted on the outside of the roller shaft assembly (1); the roller shaft assembly (1) includes a rotating shaft (3), on which a roller shaft body (4) and a positioning plate (5) are fixedly sleeved, and the positioning plate (5) is located at one end of the roller shaft body (4); the roller assembly (2) includes a roller body (6), which is detachably mounted on the roller shaft body (4), and a pull block (7) is fixedly connected to one end of the roller body (6), and a composite coating (8) is provided on the outer surface of the roller body (6).

2. The anti-corrosion and wear-resistant tungsten carbide coated roller according to claim 1, characterized in that: The outer surface of the roller body (4) is provided with multiple keyways (41) in an annular shape. The roller body (6) is a hollow structure, and the inner surface of the roller body (6) is integrally formed with multiple rectangular keys (61) that are slidably connected to the keyways (41). The rectangular keys (61) are slidably connected to the corresponding keyways (41) to slide the roller body (6) onto the roller body (4).

3. The anti-corrosion and wear-resistant tungsten carbide coated roller according to claim 1, characterized in that: The positioning plate (5) has three positioning grooves (51) arranged in a ring array. The roller body (6) has three positioning blocks (62) integrally formed at one end near the positioning plate (5) that engage with the positioning grooves (51).

4. The anti-corrosion and wear-resistant tungsten carbide coated roller according to claim 1, characterized in that: The length of the roller body (6) is equal to the length of the roller shaft body (4), and the pull block (7) is located at the end of the rotating shaft (3) away from the positioning plate (5).

5. The anti-corrosion and wear-resistant tungsten carbide coated roller according to claim 3, characterized in that: The middle part of the pull block (7) is provided with a through hole (71) that matches the inner diameter of the rotating shaft (3), and two grooves (72) are symmetrically provided at the end of the pull block (7) away from the roller body (6).

6. The anti-corrosion and wear-resistant tungsten carbide coated roller according to claim 4, characterized in that: The composite coating (8) includes a nickel-chromium alloy layer (81) coated on the outer surface of the roller body (6), a tungsten carbide coating (82) coated on the outer surface of the nickel-chromium alloy layer (81), and a nano-ceramic sealing layer (83) coated on the outer surface of the tungsten carbide coating (82).

7. The anti-corrosion and wear-resistant tungsten carbide coated roller according to claim 6, characterized in that: The thickness of the nickel-chromium alloy layer (81) is 20-50µm, the thickness of the tungsten carbide coating (82) is 100-500µm, and the thickness of the nano-ceramic sealing layer (83) is 5-20µm.

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