Corrosion prevention method for turnout roller device

Abstract

The invention discloses an anti-corrosion method of a turnout roller device, which belongs to the technical field of anti-corrosion of railway turnout roller devices, and comprises the following steps: splitting the turnout roller device into parts including bolts, nuts, a roller shaft, a rolling outer ring, an upper bracket and a lower bracket; the bolts, the nuts, the roller shaft, the rolling outer ring, the upper support and the lower support are subjected to thermal degreasing treatment; carrying out surface cleaning treatment on the bolt, the nut, the roll shaft, the rolling outer ring, the upper bracket and the lower bracket which are subjected to thermal degreasing treatment; different parts of the turnout roller device are subjected to coating anti-corrosion treatment through different coatings, specifically, bolts and nuts are subjected to single-layer dip-coating curing anti-corrosion treatment, a roller shaft and a rolling outer ring are subjected to double-layer re-coating curing anti-corrosion treatment, and an upper support and a lower support are subjected to single-layer spraying curing anti-corrosion treatment. The pertinence and economical efficiency of anti-corrosion treatment are effectively improved, so that the overall corrosion resistance of the device is guaranteed, and meanwhile, the material and machining cost is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of anti-corrosion of railway turnout roller devices, in particular to an anti-corrosion method for a turnout roller device. Background Art

[0002] Turnout roller assemblies are widely used in railway turnout systems, primarily for supporting and guiding the movement of the switch rail during turnout switching, ensuring smooth and reliable operation. These assemblies typically consist of multiple components, including bolts, nuts, rollers, outer rolling rings, and upper and lower brackets. Over long periods of operation, these assemblies are subject to alternating loads and harsh environments, such as moisture, rain, snow, dust, and temperature fluctuations, making them susceptible to rust and performance degradation.

[0003] Currently, most anti-corrosion measures for turnout roller systems employ a uniform treatment of all components, such as spraying them with anti-rust paint or applying anti-rust oil. This approach has limitations: some parts lack adequate protection, making them susceptible to corrosion; others are overtreated, increasing production costs and process complexity. Furthermore, different components require different types, thicknesses, and adhesion properties of anti-corrosion coatings due to their varying structural forms, precision requirements, and operating environments. Existing technologies fail to effectively address these differences. Summary of the Invention

[0004] The present invention provides an anti-corrosion method for a turnout roller device, so as to solve the technical problems of high cost and poor matching between coating and component characteristics in the existing anti-corrosion treatment of turnout roller devices.

[0005] According to one aspect of the present invention, a method for anti-corrosion of a switch roller device is provided, comprising the following steps: disassembling the switch roller device into parts, including bolts, nuts, roller shafts, rolling outer rings, and upper and lower brackets; subjecting the bolts, nuts, roller shafts, rolling outer rings, and upper and lower brackets to thermal degreasing treatment; performing surface cleaning treatment on the bolts, nuts, roller shafts, rolling outer rings, and upper and lower brackets after thermal degreasing treatment; and applying different coatings for anti-corrosion treatment to different parts of the switch roller device, comprising: applying a single layer of dip coating and curing anti-corrosion treatment to the bolts and nuts, applying a double layer of recoating and curing anti-corrosion treatment to the roller shafts and rolling outer ring, and applying a single layer of spray coating and curing anti-corrosion treatment to the upper and lower brackets.

[0006] Optionally, the single-layer dip coating and curing anti-corrosion treatment includes the following steps: soaking the bolts and nuts in a Dacromet solution; after soaking, taking out the bolts and nuts and drying them; and then baking and curing them so that the coating is tightly bonded to the parts to form an anti-corrosion coating.

[0007] Optionally, the double-layer coating curing anti-corrosion treatment includes the following steps: using a spray gun to evenly spray the roller shaft and the outer ring of the roller with a Dacromet solution; after spraying, performing a first baking curing and cooling to form a first layer of coating with a thickness of 5 to 15 μm; after the first curing is completed, performing a second spraying, also using a spray gun to evenly spray the Dacromet solution; after the second spraying, baking curing and cooling again to form a second layer of coating, so that the total thickness of the first and second layers of coating reaches 10 to 30 μm

[0008] Optionally, the single-layer spray curing anti-corrosion treatment includes the following steps: using a spray gun to evenly spray Dacromet solution on the upper and lower brackets; after spraying, baking, curing and cooling to form a first layer of coating on the surface of the upper and lower brackets, and the thickness of the first layer of coating is 5 to 15 μm.

[0009] Optionally, the upper and lower brackets are subjected to a paint spraying treatment after a single-layer spray curing and anti-corrosion treatment. The paint spraying treatment includes the following steps: after the first layer of coating on the surface of the upper and lower brackets is cured, a second spraying is performed, and a silver powder paint solution is evenly sprayed on the upper and lower brackets using a spray gun; after the second spraying, baking and curing and cooling are performed to form a second layer of coating on the surface of the upper and lower brackets, and the thickness of the second layer of coating is 20 to 30 μm; after the second layer of coating is cured, a third spraying is performed, and a varnish solution is evenly sprayed using a spray gun; after the third spraying, baking and curing and cooling are performed to form a third layer of coating on the surface of the upper and lower brackets, and the thickness of the third layer of coating is 15 to 35 μm.

[0010] Optionally, the thermal degreasing treatment includes the following steps: using natural gas as a heat source to bake and degrease the bolts, nuts, rollers, rolling outer rings and upper and lower brackets at 300°C.

[0011] Optionally, the surface cleaning treatment includes the following steps: shot blasting the bolts, nuts, rollers, rolling outer rings and upper and lower brackets using GH steel sand with a hardness of 63 to 66 HRC and 80 mesh.

[0012] Optionally, the baking temperature in the single-layer dipping curing anti-corrosion treatment, the double-layer recoating curing anti-corrosion treatment and the single-layer spray curing anti-corrosion treatment is between 250°C and 350°C.

[0013] Optionally, in the step of soaking the bolts and nuts in the Dacromet solution, the soaking time is 2 to 4 minutes.

[0014] Optionally, the thickness of the anti-corrosion coating on the bolts and nuts is controlled by the drying time and drying speed, and the drying process uses a preset time and speed to make the thickness of the anti-corrosion coating on the bolts and nuts 8 to 16 μm.

[0015] In summary, this application includes at least one of the following beneficial technical effects:

[0016] By breaking down the turnout roller assembly into components such as bolts, nuts, rollers, rolling outer rings, and upper and lower brackets, and selecting a more compatible anti-corrosion treatment method based on the differences in structural form, precision requirements, stress characteristics, and working environment of each component, this approach effectively matches coating performance with part function: Bolts and nuts are treated with a single-layer dip-coating and curing process, resulting in a controllable coating thickness without affecting thread fit accuracy; rollers and rolling outer rings, as key moving components, are treated with a double-layer overcoating and curing process to enhance corrosion resistance and coating density; and upper and lower brackets, as structural load-bearing components, are treated with a relatively simple single-layer spray coating to meet basic protection requirements. This combination of differentiated anti-corrosion processes avoids the "over-protection" or "under-protection" issues inherent in unified treatment methods, effectively improving the targeted and economical nature of the anti-corrosion treatment. This significantly reduces material and processing costs while ensuring the overall corrosion resistance of the assembly, resolving the key issues of high cost and poor coating compatibility in existing technologies.

[0017] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 Schematic diagram of the structure of the turnout roller device of the present invention;

[0020] Figure 2 The figure is a flow chart of the anti-corrosion method of the turnout roller device of the present invention.

[0021] Legend:

[0022] 1. Bolt; 2. Nut; 3. Roller; 4. Rolling outer ring; 5. Upper and lower brackets. DETAILED DESCRIPTION

[0023] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0024] The following is combined with Figure 1-2 This application is described in further detail.

[0025] The embodiment of the present application discloses a method for anti-corrosion of a turnout roller device.

[0026] Reference Figure 1The turnout roller device described in this embodiment is installed in the railway turnout area to support and guide the switch rail during the turnout opening and closing process. This device is composed of multiple metal components and is exposed to alternating loads, impact, rain, snow, moisture, dust, and other combined operating conditions in an outdoor environment for extended periods of time. Therefore, its key components require effective anti-corrosion treatment.

[0027] Specifically, the following main parts to be processed are included: Bolt 1: used to connect the various structural components of the roller device and has a preload transmission function. It is a standard cylindrical threaded part with a large number of small volumes and high thread precision requirements. Nut 22: used in conjunction with bolt 1, it is a standard internal thread fastener used to achieve structural locking and has high dimensional matching requirements. Roller 33: a core component for force transmission and support, bearing cyclic loads, and requiring high wear resistance and corrosion resistance. Rolling outer ring 44: a major rotating component, fitted onto the outside of roller 3, forming rolling contact with roller 3. It operates frequently and requires good corrosion resistance and surface density to ensure smooth operation of the device. Upper and lower brackets 5: the load-bearing and connecting basic components of the device, mainly for structural positioning and force transmission. The structure is large in size and complex in shape, prone to mechanical damage during installation, and requires high requirements for coating wear resistance and appearance consistency.

[0028] Due to differences in function, structural characteristics and working environment, the above-mentioned parts have differentiated requirements for the performance indicators of the anti-corrosion layer such as coating thickness, bonding strength, weather resistance, etc. in actual use. Therefore, it is necessary to use anti-corrosion treatment processes that match their characteristics for surface treatment to achieve the optimal balance between performance and cost.

[0029] Because metal parts often retain organic contaminants such as grease, coolants, and lubricants during processing, transportation, and storage, these substances can severely affect the adhesion between the subsequent coating and the metal substrate, leading to defects such as blistering, shedding, and pinholes during the curing process, reducing the coating's density and protective performance. Therefore, thermal degreasing of components before coating is a critical pretreatment step to ensure coating quality and corrosion resistance.

[0030] Specifically, the method of thermal degreasing treatment is: use natural gas as a heat source to bake and degrease the bolts 1, nuts 2, rollers 3, rolling outer rings 4 and upper and lower brackets 5 at 300°C. The metal parts to be treated are placed in a special thermal degreasing furnace and heated using natural gas as a heat source. By precisely controlling the temperature in the furnace, the temperature is raised to about 300°C and maintained at a constant temperature for a certain period of time, such as 30 to 60 minutes, so that the grease, cutting fluid, lubricant and other organic pollutants on the surface and in the micropores of the parts are fully pyrolyzed, volatilized or carbonized, and completely removed with the help of a high temperature environment. During the treatment process, the decomposition products can be discharged in time with the help of an exhaust device to prevent the pollutants from re-attaching to the surface of the workpiece at high temperatures. This method has the advantages of thorough degreasing, no damage to the substrate, and high treatment efficiency, providing clean and activated metal surface conditions for subsequent surface treatment processes.

[0031] In addition to the natural gas heating method used in this example, thermal degreasing can also be achieved through electric heating furnaces, infrared heating, hot air circulation furnaces, and induction heating. Electric heating furnaces utilize resistance heating elements to provide stable high temperatures and are suitable for batch processing of precision parts. Infrared heating rapidly heats the part surface through radiation, offering high efficiency and suitable for thin-walled workpieces. Hot air circulation furnaces heat the part surface through forced convection, achieving excellent temperature uniformity and suitable for workpieces with complex shapes. Induction heating utilizes the principle of electromagnetic induction to directly heat the metal, offering rapid temperature increases and precise control, making it suitable for localized degreasing or high-efficiency production scenarios.

[0032] After thermal degreasing, although the metal parts are free of oil, inorganic contaminants such as scale, rust, and welding slag may still remain. These residues can weaken the mechanical bond between the coating and the substrate, reducing coating adhesion and uniformity, and thus affecting the durability and stability of the anti-corrosion coating. Surface cleaning can effectively remove these attachments while forming a microscopic roughness on the metal surface, providing a good "anchoring" foundation for the coating, thereby enhancing the coating's adhesion, density, and overall corrosion resistance.

[0033] Surface cleaning is performed using shot blasting, using GH steel grit with a hardness of 63-66 HRC and a grit size of 80 mesh as the blasting medium. This grit is applied to the surface of the part at high speed via a shot blasting machine. The strong friction and impact generated by the steel grit particles upon contact with the metal surface effectively removes scale, rust, welding slag, and residual contaminants, while creating a uniform surface roughness that provides a good adhesion foundation for subsequent coatings. The spray angle, speed, and duration are carefully controlled during the process to ensure uniform cleaning without excessive damage to the substrate, while also meeting the surface roughness requirements of the Dacromet coating.

[0034] In addition to shot blasting, surface cleaning can also include sandblasting, chemical rust removal such as pickling, alkaline degreasing, mechanical grinding, and laser cleaning. Sandblasting uses compressed air to spray abrasives such as quartz sand and glass beads onto the workpiece surface at high speed, removing rust and scale and creating surface roughness. It is suitable for complex structures or thin-walled parts. Chemical rust removal uses acidic solutions to dissolve oxides on the metal surface. It is suitable for treating deep rust, but environmental issues must be considered. Alkaline cleaning is mainly used for chemical cleaning of oil stains. Mechanical grinding and wire brushing are suitable for local finishing. Laser cleaning is an emerging non-destructive and environmentally friendly technology suitable for surface treatment requiring high precision.

[0035] Different components of the turnout roller assembly are treated with different coatings for corrosion protection: bolts 1 and nuts 2 receive a single layer of dip-coating and curing treatment, the roller shaft 3 and outer ring 4 receive a double layer of overcoating and curing treatment, and the upper and lower brackets 5 receive a single layer of spray-coating and curing treatment. The reason for using different coatings for different components of the turnout roller assembly is that each component has significant differences in structural characteristics, operating environment, and performance requirements. Bolts 1 and nuts 2 are threaded fasteners with high dimensional accuracy, especially thread fit precision. Therefore, a single-layer dip-coating and curing process with a thin, evenly distributed coating is used to provide the necessary corrosion protection without compromising assembly accuracy. The roller 3 and outer ring 4, as key components bearing rotating loads, require higher corrosion resistance and coating density. Therefore, a double-layer overcoating and curing process is used to form a thicker and more structurally stable protective layer to improve durability and reliability. Upper and lower brackets 5, on the other hand, are structural load-bearing components with a relatively stable working environment. The coating thickness and precision requirements are relatively low, so a simple, low-cost, single-layer spray-coating and curing process is sufficient to meet their protection needs. Through differentiated treatment, a precise match between corrosion resistance and component performance is achieved, effectively controlling costs while ensuring the overall protection of the entire machine, improving overall economic efficiency and process rationality.

[0036] The single-layer dip-coating and curing anti-corrosion treatment involves the following steps: First, the bolts (1) and nuts (2), which have been thermally degreased and shot-blasted, are immersed in a prepared Dacromet solution, ensuring that the coating fully covers all surfaces, including vulnerable areas such as the thread roots. After removal, the parts are immediately centrifuged and dried. After coating, the parts are placed in a hot air circulating oven and baked for 20 minutes at a temperature of 250°C to 350°C, preferably 300°C, to complete the inorganic film formation and curing of the coating, followed by natural cooling.

[0037] In the step of soaking the bolt 1 and nut 2 in the Dacromet solution, the soaking time is 2 to 4 minutes, and in a specific embodiment, preferably 3 minutes. This is done to ensure that the coating liquid can fully wet and evenly cover the threaded parts and grooves and other complex structural areas, forming a continuous and complete coating, while avoiding insufficient coating adhesion due to too short an immersion time, or too thick coating accumulation due to too long an immersion time, which affects the thread fit accuracy. 3 minutes is preferred as a control parameter. It is the optimal balance point obtained through actual process verification under the premise of ensuring anti-corrosion performance, which can achieve the optimal match between protection effect, dimensional accuracy and material utilization.

[0038] The thickness of the anti-corrosion coating on bolt 1 and nut 2 is controlled by the preset speed and drying time during the drying process, and the corresponding relationship is obtained through multiple test optimizations. Specifically, after the Dacromet solution is dipped, by adjusting the speed of the centrifugal drying equipment (such as 500, 700, 900 rpm) and the drying time (such as 10 seconds, 20 seconds, 30 seconds), the thickness, uniformity and thread fit of the coating under different parameter combinations are compared, and finally the optimal process window for stably obtaining a coating of 8 to 16 μm is screened out. This process can prevent the coating from affecting thread fit or causing surface defects due to sagging due to excessive thickness.

[0039] Dacromet coating is an inorganic anti-corrosion coating system composed primarily of zinc and aluminum powders, supplemented with chromates, organic binders, and other additives. It appears as an off-white or silver-gray suspension. Its core principle is to provide excellent corrosion resistance through the cathodic protection of zinc and aluminum, as well as the dense flaky structure formed by the coating after film formation at high temperatures. Dacromet coating does not contain the heavy metal electrolysis process required for electroplating. Application methods typically involve spraying or dipping. After high-temperature baking, it is transformed into a stable metal-ceramic composite film with strong adhesion and high salt spray resistance. It can be used for anti-corrosion coating of high-strength steel parts without causing hydrogen embrittlement.

[0040] Compared with the spraying process, the dipping method can ensure that the coating liquid evenly penetrates into the inner wall of the thread and deep recessed parts, forming a fully covered anti-corrosion layer, effectively preventing local rust; and the centrifugal drying process can remove excess coating liquid, avoiding difficulties in thread engagement or too small fitting clearance due to excessively thick coating, thereby ensuring assembly accuracy and fastening performance; the 300°C high-temperature curing process ensures the full directional arrangement of the zinc and aluminum flake layers in the coating and the chromium salt curing reaction, thereby improving the density and adhesion of the coating and providing stable protection for long-term outdoor service.

[0041] The double-layer overcoating and curing anti-corrosion treatment involves the following steps: After thermal degreasing and surface shot blasting, a layer of Dacromet coating is evenly sprayed onto the roller shaft 3 and rolling outer ring 4 using a high-pressure airless spray gun, ensuring that the coating covers all geometric surfaces and microstructural details. Immediately after spraying, the roller shaft 3 and rolling outer ring 4 are placed in an oven for a first high-temperature bake for 20 minutes to complete film formation and initial curing of the first layer. After cooling to room temperature, a second layer of Dacromet coating is sprayed and a second bake is performed to cure the composite coating. The total thickness of the two coating layers is controlled between 10 and 30 μm. The bake temperature is 250°C to 350°C, preferably 300°C. This double-layer coating design not only increases the coating thickness but also enhances the crack resistance and impact resistance of the multi-layer structure. The first layer fills surface micro-defects and provides an initial barrier to corrosive media, while the second layer provides further reinforcement and protection, forming a dense and stable protective barrier. Spray coating was chosen over dip coating because the roller 3 and outer ring 4 are medium-to-large structural components with complex shapes and considerable weight. Spray coating is more suitable for on-site operation, facilitating control of coating thickness and spray angle, ensuring uniform coating across all areas and avoiding missed areas or excessive buildup. The high-temperature dual-curing process fully aligns the zinc and aluminum particles, enhancing the coating's shielding effect and self-healing capabilities, significantly enhancing salt spray and wear resistance.

[0042] In this embodiment, the upper and lower brackets 5 serve as supporting members in the turnout roller device, primarily for fixing the roller position and bearing the installation and operating loads of the entire device. This type of structural member typically has a complex shape, a wide load-bearing surface, and is frequently installed, making it susceptible to surface coating wear due to collisions, friction, and the like. Furthermore, it is exposed to outdoor environments and is also subject to the effects of moisture, corrosion, and ultraviolet radiation. Therefore, in order to balance its corrosion resistance, surface hardness, aesthetics, and weather resistance, the upper and lower brackets 5 are treated with a composite coating protection process of "one coat and one bake Dacromet + silver paint + varnish."

[0043] The specific steps are as follows: After thermal degreasing and shot blasting, a high-pressure spray gun is first used to evenly spray a layer of Dacromet solution onto the upper and lower brackets 5, ensuring that the coating covers all structural surfaces and mounting holes. After spraying, the brackets are placed in a high-temperature oven and cured at 300°C for 20 minutes to form a first layer of Dacromet inorganic coating with a thickness of 5-15μm. This layer provides basic zinc-aluminum composite corrosion protection and provides a good adhesion base for subsequent organic paint layers. After the Dacromet coating cools, a second layer of silver paint solution is sprayed. After spraying, the brackets are baked again at 300°C for 20 minutes to form a second metallic effect coating with a thickness of 20-30μm, enhancing the surface decorative properties and hiding power. After the silver paint has cured and cooled, a third spraying process is performed, followed by a seal coat of clear varnish solution and a further high-temperature bake to form a surface protective coating of 15-35μm. The final composite coating thickness can reach 40-80μm.

[0044] This composite process combines the corrosion resistance of the Dacromet inorganic coating, the covering decorative properties of the silver powder paint, and the wear-resistant protection of the varnish, giving the upper and lower brackets 5 a high surface hardness and impact resistance while meeting long-term outdoor protection requirements. The Dacromet layer provides basic cathodic protection and a rust barrier, the silver powder paint enhances UV resistance through metal reflection, and the varnish seal prevents water vapor penetration and particle wear damage, forming a triple protection system of "bottom layer anti-corrosion - middle layer decoration - surface layer sealing." In addition, this process forms a silver-gray glossy coating on the surface of the bracket, which not only improves the consistency of the overall appearance of the machine, but also facilitates subsequent maintenance and inspection. Compared with traditional single-layer paint protection or pure Dacromet treatment methods, this three-layer composite system is more suitable for metal structures that are frequently installed, have complex structures, and have high appearance requirements, especially in high humidity, high pollution, or multiple loading and unloading scenarios. Its coating is not easy to peel, crack, or fade, significantly improving the service life of the upper and lower brackets 5 and the overall protection integrity of the machine.

[0045] This solution implements targeted anti-corrosion processes for various components of the turnout roller assembly, fully considering their structural characteristics, performance requirements, and service environment. This approach effectively combines corrosion protection, assembly precision, aesthetic quality, and cost control. First, bolts and nuts are treated using a one-dip, one-bake Dacromet process, achieving a coating thickness of 8 to 16 μm. This process provides uniform coating distribution and strong adhesion, not only offering excellent corrosion resistance but also effectively avoiding thread interference issues caused by excessive coating thickness. This ensures that fasteners meet long-term corrosion protection requirements while maintaining excellent assembly performance, thereby enhancing fastening reliability and service life. Secondly, the roller shaft and outer ring, acting as moving and transmission components, are coated with a two-coat, two-bake Dacromet process, resulting in a double-layer anti-corrosion coating structure with a thickness of 10 to 30 μm. This coating system offers enhanced density and corrosion resistance, effectively preventing rust and coating detachment under long-term dynamic loads and harsh environments, delaying metal fatigue. It also imparts a uniform silver-gray finish to the component surfaces, enhancing the overall product's visual quality and engineering image. Finally, the upper and lower brackets adopt a three-layer composite coating structure of Dacromet, silver powder paint and varnish with one coating and one baking, and the final total coating thickness can reach 40 to 80μm. This composite system integrates inorganic anti-corrosion, metal decoration and wear-resistant sealing layer. It not only significantly improves the corrosion resistance of the bracket, but also enhances the surface hardness and scratch resistance. It can effectively deal with the wear problems caused by mechanical friction and long-term exposure during the installation process. At the same time, the superposition effect of the silver powder layer and the varnish makes the bracket surface more beautiful and shiny, with good visual consistency and brand recognition. In summary, this anti-corrosion process solution achieves a precise match between coating performance and component function through differentiated treatment methods. While ensuring the overall durability of the turnout roller device, it optimizes process costs and production efficiency, and has good engineering promotion prospects and application value.

[0046] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. Anti-corrosion method for a turnout roller device, characterized in that: The steps include: The turnout roller device is disassembled into parts, including bolts (1), nuts (2), roller shafts (3), rolling outer rings (4), and upper and lower brackets (5); Perform thermal degreasing treatment on the bolts (1), nuts (2), roller shaft (3), rolling outer ring (4) and upper and lower brackets (5); Performing surface cleaning on the bolts (1), nuts (2), roller shaft (3), rolling outer ring (4) and upper and lower brackets (5) after thermal degreasing treatment; Different components of the turnout roller device are treated with different coatings for corrosion protection, including: bolts (1) and nuts (2) are treated with a single-layer dip coating and curing for corrosion protection; roller shafts (3) and rolling outer rings (4) are treated with a double-layer coating and curing for corrosion protection; and upper and lower brackets (5) are treated with a single-layer spray coating and curing for corrosion protection.

2. The anti-corrosion method for a turnout roller device according to claim 1, characterized in that: The single-layer dip coating curing anti-corrosion treatment comprises the following steps: Soak the bolt (1) and the nut (2) in a Dacromet solution; After soaking, the bolts (1) and nuts (2) are taken out and dried; Then, the coating is baked and cured so that the coating is tightly bonded to the bolt (1) and the nut (2) to form an anti-corrosion coating.

3. The anti-corrosion method for a turnout roller device according to claim 1, characterized in that: The double-layer coating curing and anti-corrosion treatment comprises the following steps: Use a spray gun to evenly spray the Dacromet solution on the roller shaft (3) and the rolling outer ring (4); After spraying, the first baking and curing and cooling are carried out to form the first layer of coating with a thickness of 5 to 15 μm; After the first curing is completed, the second spraying is carried out, and the Dacromet solution is evenly sprayed using a spray gun; After the second spraying, the coating is baked and solidified and cooled again to form a second coating layer, so that the total thickness of the first coating layer and the second coating layer reaches 10 to 30 μm.

4. The anti-corrosion method for a turnout roller device according to claim 3, characterized in that: The single-layer spray curing anti-corrosion treatment comprises the following steps: Use a spray gun to evenly spray the Dacromet solution on the upper and lower brackets (5); After spraying, baking and curing are carried out and cooling is performed to form a first layer of coating on the surface of the upper and lower brackets (5). The thickness of the first layer of coating is 5 to 15 μm.

5. The anti-corrosion method for a turnout roller device according to claim 4, characterized in that: The upper and lower brackets (5) are subjected to a single-layer spray curing anti-corrosion treatment and then a paint spraying treatment is performed. The paint spraying treatment includes the following steps: After the first layer of coating on the surface of the upper and lower brackets (5) is cured, a second spraying is performed, and the silver powder paint solution is evenly sprayed on the upper and lower brackets (5) using a spray gun; After the second spraying, baking and curing are carried out and cooling is performed to form a second coating layer on the surface of the upper and lower brackets (5), and the thickness of the second coating layer is 20 to 30 μm; After the second coat is cured, carry out the third spraying, using a spray gun to evenly spray the varnish solution; After the third spraying, baking, curing and cooling are performed to form a third coating layer on the surface of the upper and lower brackets (5). The thickness of the third coating layer is 15 to 35 μm.

6. The anti-corrosion method for a turnout roller device according to claim 1, characterized in that: The thermal degreasing treatment comprises the following steps: using natural gas as a heat source to bake and degrease the bolts (1), nuts (2), rollers (3), rolling outer rings (4) and upper and lower brackets (5) at 300°C.

7. The anti-corrosion method for a turnout roller assembly according to claim 6, characterized in that: The surface cleaning treatment comprises the following steps: using GH steel grit with a hardness of 63 to 66 HRC and 80 mesh to shot blast the bolts (1), nuts (2), rollers (3), rolling outer rings (4) and upper and lower brackets (5).

8. The anti-corrosion method for a turnout roller assembly according to any one of claims 1 to 4, characterized in that: The baking temperature in the single-layer dipping curing anticorrosion treatment, the double-layer recoating curing anticorrosion treatment and the single-layer spray curing anticorrosion treatment is between 250°C and 350°C.

9. The anti-corrosion method for a turnout roller assembly according to claim 2, characterized in that: In the step of soaking the bolt (1) and the nut (2) in the Dacromet solution, the soaking time is 2 to 4 minutes.

10. The anti-corrosion method for a turnout roller assembly according to claim 2, characterized in that: The thickness of the anti-corrosion coating of the bolt (1) and the nut (2) is controlled by the drying time and the drying speed. The drying process uses a preset time and speed to make the thickness of the anti-corrosion coating of the bolt (1) and the nut (2) 8 to 16 μm.

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