CN120479727A - Corrosion prevention method for turnout roller device - Google Patents

Abstract

The present invention discloses an anti-corrosion method for a turnout roller device, which belongs to the technical field of anti-corrosion of railway turnout roller devices. The method comprises the following steps: disassembling the turnout 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; surface cleaning treatment of 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 turnout roller device, including: applying a single-layer dip coating and curing anti-corrosion treatment to the bolts and nuts, applying a double-layer recoating and curing anti-corrosion treatment to the roller shafts and rolling outer rings, and applying a single-layer spray coating and curing anti-corrosion treatment to the upper and lower brackets. The present application effectively improves the pertinence and economy of the anti-corrosion treatment, thereby significantly reducing material and processing costs while ensuring the overall corrosion resistance of the device.

Description

Corrosion prevention method for turnout roller device

Technical Field

The invention relates to the technical field of corrosion prevention of railway switch roller devices, in particular to a corrosion prevention method of a switch roller device.

Background

The turnout roller device is widely applied to railway turnout systems, and is mainly used for supporting and guiding the movement of a tongue rail in the turnout switching process so as to ensure the stability and reliability of turnout switching. The device is generally composed of a plurality of parts, including bolts, nuts, roll shafts, rolling outer rings, upper brackets, lower brackets and the like, and is extremely susceptible to rust corrosion and performance degradation under the combined action of alternating loads and severe environments, such as moisture, rain, snow, dust, temperature difference changes and the like, in long-term operation.

At present, the anti-corrosion measures for the turnout roller device are mostly to treat all parts in a unified mode, such as spraying anti-rust paint or coating anti-rust oil on the whole. The treatment mode has certain limitations that part of parts are insufficient in protection effect and easy to corrode, and part of parts are excessively treated, so that the production cost and the process complexity are increased. In addition, different parts have differences in the types, thickness and adhesion properties of the anti-corrosion coating due to different structural forms, precision requirements and working environments, and the differences are not effectively matched in the prior art.

Disclosure of Invention

The invention provides an anti-corrosion method of a turnout roller device, which aims to solve the technical problems of high cost, poor matching property of a coating and parts and the like in the anti-corrosion treatment of the conventional turnout roller device.

According to one aspect of the invention, the anti-corrosion method of the turnout roller device comprises the steps of dividing the turnout roller device into parts, wherein the parts comprise bolts, nuts, roller shafts, rolling outer rings and upper and lower supports, performing thermal degreasing treatment on the bolts, the nuts, the roller shafts, the rolling outer rings and the upper and lower supports, performing surface cleaning treatment on the bolts, the nuts, the roller shafts, the rolling outer rings and the upper and lower supports after the thermal degreasing treatment, and respectively adopting different coating anti-corrosion treatment on different parts of the turnout roller device, wherein the single-layer dip coating anti-corrosion treatment is adopted for the bolts and the nuts, the double-layer dip coating anti-corrosion treatment is adopted for the roller shafts and the rolling outer rings, and the single-layer spray coating anti-corrosion treatment is adopted for the upper and lower supports.

Optionally, the single-layer dip-coating curing anti-corrosion treatment comprises the steps of soaking the bolts and nuts in Dacromet solution, taking out the bolts and nuts after soaking, spin-drying, and then baking and curing to enable the coating and the part to be tightly adhered to form an anti-corrosion coating.

Optionally, the double-layer recoating, curing and anti-corrosion treatment comprises the steps of uniformly spraying dacromet solution on a roll shaft and a rolling outer ring by using a spray gun, baking, curing and cooling for the first time after spraying to form a first layer of coating with the thickness of 5-15 mu m, spraying for the second time after the first curing is finished, uniformly spraying dacromet solution by using the spray gun, baking, curing and cooling again after the second spraying to form a second layer of coating, and enabling the total thickness of the first layer of coating and the second layer of coating to reach 10-30 mu m

Optionally, the single-layer spraying, curing and anti-corrosion treatment comprises the steps of uniformly spraying Dacromet solution on the upper and lower supports by using a spraying gun, and after spraying, baking, curing and cooling to form a first layer of coating on the surfaces of the upper and lower supports, wherein the thickness of the first layer of coating is 5-15 mu m.

Optionally, the upper and lower brackets are subjected to single-layer spraying, curing and corrosion-preventing treatment, and then are subjected to paint spraying treatment, wherein the paint spraying treatment comprises the steps of carrying out second spraying after the first layer of coating on the surfaces of the upper and lower brackets is cured, uniformly spraying silver paint solution on the upper and lower brackets by using a spraying gun, carrying out baking, curing and cooling after the second spraying, enabling the surfaces of the upper and lower brackets to form a second layer of coating, enabling the thickness of the second layer of coating to be 20-30 mu m, carrying out third spraying after the second layer of coating is cured, uniformly spraying varnish solution by using a spraying gun, and carrying out baking, curing and cooling after the third spraying, so that a third layer of coating is formed on the surfaces of the upper and lower brackets, wherein the thickness of the third layer of coating is 15-35 mu m.

Optionally, the thermal degreasing treatment comprises the step of baking and degreasing bolts, nuts, roll shafts, rolling outer rings and upper and lower brackets at 300 ℃ by using natural gas as a heat source.

Optionally, the surface cleaning treatment comprises the following steps of performing shot blasting on the bolts, the nuts, the roll shafts, the rolling outer rings and the upper and lower supports by using GH steel grit with the hardness of 63-66 HRC and 80 meshes.

Optionally, the baking temperature in the single-layer dip-coating curing anti-corrosion treatment, the double-layer recoating curing anti-corrosion treatment and the single-layer spray-coating curing anti-corrosion treatment is between 250 ℃ and 350 ℃.

Optionally, in the step of soaking the bolt and the nut in the Dacromet solution, the soaking time is 2-4 minutes.

Optionally, the thickness of the anti-corrosion coating of the bolt and the nut is controlled by the spin-drying time and the spin-drying speed, and the spin-drying process adopts the preset time and speed to enable the thickness of the anti-corrosion coating of the bolt and the nut to be 8-16 mu m.

In summary, the present application includes at least one of the following beneficial technical effects:

The turnout roller device is split into parts such as a bolt, a nut, a roller shaft, a rolling outer ring, an upper bracket and a lower bracket, and according to differences of the parts in structural form, precision requirement, stress characteristics and working environment, a corrosion-resistant treatment mode with higher matching performance is selected respectively, so that effective adaptation of coating performance and part functions is realized. Through the combined use of the differential corrosion prevention technology, the problems of excessive protection or insufficient protection in a unified treatment mode are avoided, the pertinence and the economical efficiency of corrosion prevention treatment are effectively improved, the overall corrosion resistance of the device is ensured, the material and processing cost are greatly reduced, and the key problems of high cost and poor coating matching in the prior art are solved.

In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

FIG. 1 is a schematic view of the structure of a switch roller device of the present invention;

Fig. 2 is a flowchart of an anti-corrosion method of the switch roller device of the present invention.

Legend description:

1. The device comprises a bolt, a nut, a roller shaft, a rolling outer ring, an upper bracket and a lower bracket.

Detailed Description

Embodiments of the invention are described in detail below with reference to the attached drawing figures, but the invention can be practiced in a number of different ways, as defined and covered below.

The application is described in further detail below with reference to fig. 1-2.

The embodiment of the application discloses an anti-corrosion method of a turnout roller device.

Referring to fig. 1, the switch roller device according to the present embodiment is installed in a railway switch area, and is used for supporting and guiding a switch rail during switch switching. The device is composed of a plurality of metal parts, and is exposed to the outdoor operation environment for a long time to bear the comprehensive working conditions of alternating load, impact, rain, snow, moisture, dust and the like, so that key parts of the device need to be subjected to effective anti-corrosion treatment.

The device comprises a bolt 1, a roller device, a pressing device and a pressing device. The external form is a standard cylindrical threaded part, the number is large, the volume is small, the requirement on thread precision is high, the nut 22 is matched with the bolt 1 to be used as an internal thread standard fastener for realizing structural locking and has high dimensional matching requirement, the roll shaft 33 is a core part for transmitting and supporting force and bears periodic load and has high requirements on wear resistance and corrosion resistance, the rolling outer ring 44 is a main rotating part sleeved outside the roll shaft 3 and matched with the roll shaft 3 to form rolling contact, the running is frequent, good corrosion resistance and surface compactness are required to ensure stable running of the device, the upper bracket 5 and the lower bracket are load-bearing and connecting basic components of the device and mainly play a role in positioning and transmitting force, the structural size is large, the shape is complex, mechanical damage is easy to generate in the installation process, and the requirements on the wear resistance and the appearance consistency of a coating are high.

The above parts have different requirements for the coating thickness, binding force, weather resistance and other performance indexes of the anti-corrosion layer in actual use due to different functions, structural characteristics and different working environments, so that the anti-corrosion treatment process matched with the characteristics of the parts is required to be adopted for surface treatment so as to realize the optimal balance of performance and cost.

Because organic pollutants such as grease, cooling liquid, lubricant and the like often remain in the processing, transporting and storing processes of the metal parts, the substances can seriously influence the adhesive force between the subsequent coating and the metal substrate, so that the defects such as foaming, falling, pinholes and the like are generated in the baking and solidifying process of the coating, and the compactness and the protective performance of the coating are reduced. Therefore, the thermal degreasing treatment is performed on the parts before the coating is applied, and is a key pretreatment step for ensuring the coating quality and the corrosion resistance.

Specifically, the thermal degreasing treatment method comprises the step of baking and degreasing bolts 1, nuts 2, roller shafts 3, rolling outer rings 4 and upper and lower brackets 5 at 300 ℃ by using natural gas as a heat source. And placing the metal part to be treated in a special thermal degreasing furnace, and heating by taking natural gas as a heat source. By precisely controlling the temperature in the furnace, the temperature is raised to about 300 ℃ and kept constant for a certain period of time, for example, 30 to 60 minutes, so that organic pollutants such as grease, cutting fluid, lubricant and the like on the surface of the part and in micropores are fully pyrolyzed, volatilized or carbonized, and thorough removal is realized by means of a high-temperature environment. The method can be matched with an exhaust device to timely discharge decomposition products in the treatment process, so that pollutants are prevented from being reattached to the surface of the workpiece at high temperature. The method has the advantages of thorough degreasing, no damage to the base material, high treatment efficiency and the like, and provides clean and activated metal surface conditions for the subsequent surface treatment process.

In addition to the thermal degreasing treatment performed by the natural gas heating method in this embodiment, thermal degreasing may be performed by an electric heating furnace, infrared heating, a hot air circulation furnace, induction heating, or the like. The electric heating furnace utilizes the resistance heating element to provide stable high temperature, is suitable for batch processing of precise parts, has high efficiency by infrared heating through a radiation mode, is suitable for thin-wall workpieces, has good temperature uniformity by heating the surfaces of the parts through a forced convection mode by the hot air circulation furnace, is suitable for workpieces with complex shapes, directly heats metals by induction heating through an electromagnetic induction principle, has quick temperature rise and accurate control, and is suitable for local degreasing or high-efficiency production scenes.

After thermal degreasing is completed, although greasy dirt is removed from the surface of the metal part, inorganic pollutants such as oxide skin, rust, welding slag and the like may still exist, and the residues weaken mechanical biting force between the coating and the substrate, reduce the adhesive force and uniformity of the coating, and further influence the durability and stability of the anti-corrosion coating. Through surface cleaning treatment, attachments can be effectively removed, and a micro-rough structure is formed on the metal surface, so that a good anchoring foundation is provided for the coating, and the adhesive force, compactness and overall corrosion resistance of the coating are enhanced.

The surface cleaning is carried out in a shot blasting treatment mode, specifically GH steel grit with the hardness of 63-66 HRC and the granularity of 80 meshes is used as a spraying medium, and the steel grit is acted on the surface of the part in a high-speed impact mode through a shot blasting machine. The steel grit particles generate strong friction and impact when contacting with the metal surface, can effectively remove oxide scales, rust spots, welding slag and residual dirt, and form uniform roughness on the surface, thereby providing a good adhesion foundation for subsequent coatings. The spraying angle, speed and time should be controlled in the treatment process to ensure that the cleaning effect is uniform and the substrate is not excessively damaged, and simultaneously, the technical requirement of the Dacromet coating on the surface roughness is met.

Besides shot blasting treatment, the surface cleaning treatment can also adopt modes of sand blasting, chemical rust removal such as acid washing, alkali washing degreasing, mechanical polishing, laser cleaning and the like. The method comprises the steps of spraying abrasive materials such as quartz sand, glass beads and the like on the surface of a workpiece at a high speed through compressed air to remove rust and oxide skin and form surface roughness, and is suitable for a complex-structure or thin-wall workpiece, wherein the chemical rust removal adopts an acidic solution to dissolve oxide on the surface of the metal, is suitable for deep rust treatment, but needs to pay attention to environmental protection, the alkaline cleaning is mainly used for chemical cleaning of greasy dirt, the mechanical polishing and the steel wire brush are suitable for local trimming, and the laser cleaning is an emerging nondestructive environmental protection technology and is suitable for surface treatment with high precision requirements.

Different parts of the turnout roller device are coated with different coatings for corrosion prevention treatment respectively, wherein the turnout roller device comprises a bolt 1 and a nut 2 which are subjected to single-layer dip coating and curing for corrosion prevention treatment, a roller shaft 3 and a rolling outer ring 4 which are subjected to double-layer dip coating and curing for corrosion prevention treatment, and an upper bracket and a lower bracket 5 which are subjected to single-layer spray coating and curing for corrosion prevention treatment. Different coating and corrosion-resistant treatment modes are respectively adopted for different parts of the turnout roller device, and the turnout roller device is based on the remarkable difference of the parts in structural characteristics, working environments and performance requirements. The bolt 1 and the nut 2 belong to threaded fasteners, have higher requirements on dimensional accuracy, particularly screw thread matching accuracy, therefore, a single-layer dip coating curing process with thinner coating and even distribution is adopted, not only can necessary anti-corrosion protection be provided, but also the assembly accuracy cannot be influenced, the roller shaft 3 and the rolling outer ring 4 are used as key components for bearing rotating load, and have higher anti-corrosion capability and coating compactness, thus, a thicker and structurally stable protective layer is formed by adopting a double-layer dip coating curing process so as to improve the durability and the use reliability of the protective layer, the upper bracket 5 and the lower bracket are structural bearing pieces, the working environment is relatively stable, the requirements on the thickness and the accuracy of the coating are not high, and the protective requirement can be met by adopting a single-layer spray coating curing process with simple operation and lower cost. Through differentiation treatment, the accurate matching of the corrosion resistance and the part performance is realized, the cost is effectively controlled while the protection effect of the whole machine is ensured, and the overall economy and the process rationality are improved.

The single-layer dip-coating curing anti-corrosion treatment comprises the following steps of firstly, immersing the bolt 1 and the nut 2 which are subjected to thermal degreasing and shot blasting in a prepared Dacromet solution to ensure that the coating liquid can fully cover all parts on the surface of a part, including corrosion dead angles such as thread roots and the like. And (5) immediately entering a centrifugal drying link after being taken out. After the coating is finished, the part is placed into a hot air circulation oven for baking for 20 minutes, wherein the baking temperature is 250-350 ℃, preferably 300 ℃, and the inorganic film forming and solidification of the coating are finished, and then natural cooling is carried out.

In the step of immersing the bolt 1 and the nut 2 in the dacromet solution, the immersing time is 2 to 4 minutes, and in a specific embodiment, 3 minutes is preferable. The method is used for ensuring that the coating liquid can fully wet and uniformly cover the complex-structure areas such as the thread parts, the grooves and the like to form continuous and complete coating, and meanwhile, the problems that the coating liquid is not adhered enough due to too short soaking time or the coating is accumulated too thick due to too long soaking time to influence the thread matching precision are avoided. Preferably 3 minutes is used as a control parameter, and the optimal balance point obtained through practical process verification can realize the optimal matching of the protection effect, the dimensional accuracy and the material utilization rate on the premise of ensuring the corrosion resistance.

The thickness of the anti-corrosion coating of the bolt 1 and the nut 2 is controlled by the preset rotating speed and the spin-drying time in the spin-drying process, and the corresponding relation is obtained through optimization of multiple tests. Specifically, after the dip-coating of the dacromet solution is completed, the optimal process window capable of stably obtaining the coating with the thickness of 8-16 mu m is finally screened out by adjusting the rotating speed (such as 500, 700 and 900 rpm) and the spin-drying time (such as 10 seconds, 20 seconds and 30 seconds) of the centrifugal spin-drying equipment and comparing the thickness, uniformity and screw thread matching conditions of the coating under different parameter combinations. This process prevents the coating from being too thick to affect the thread fit or sagging to cause surface defects.

The Dacromet coating liquid is an inorganic anticorrosive coating system which takes zinc powder and aluminum powder as main components and is supplemented with chromate, organic binder and other auxiliary agents, and is in an off-white or silver gray suspension state. The core principle is that the excellent corrosion resistance is provided by the cathodic protection effect of zinc and aluminum and the compact lamellar structure formed by the coating after film formation at high temperature. The dacromet coating liquid does not contain the heavy metal electrolysis process required by electroplating, the construction mode mostly adopts spray coating or dip coating, and is converted into a stable metal-ceramic composite film after high-temperature baking, the adhesive force is strong, the salt spray resistance is high, and the dacromet coating liquid can be applied to the anti-corrosion coating of high-strength steel parts on the premise of not generating hydrogen embrittlement.

Compared with the spraying process, the dip coating method can ensure that the coating liquid uniformly permeates into the inner wall and the deep concave part of the thread to form a fully-coated anti-corrosion layer, so that local corrosion is effectively prevented, the centrifugal spin-drying process can remove the excessive coating liquid, so that the difficulty in thread engagement or too small fit clearance caused by too thick coating is avoided, the assembly precision and the fastening performance are ensured, the high-temperature curing process at 300 ℃ ensures the fully-oriented arrangement of the zinc aluminum sheet layer in the coating and the curing reaction of chromium salt, the compactness and the adhesive force of the coating are improved, and stable protection is provided for long-term outdoor service.

After finishing thermal degreasing and surface shot blasting treatment, uniformly spraying a layer of dacromet coating liquid on the surfaces of the roller shaft 3 and the rolling outer ring 4 by using a high-pressure airless spray gun, ensuring that the coating covers the geometric surfaces and the microstructure details, immediately sending the coating into an oven for first high-temperature baking after finishing spraying, and keeping for 20 minutes to finish film forming and primary curing of the first layer of coating. And cooling to normal temperature, spraying the second layer of Dacromet coating liquid again, and performing secondary baking and solidification to form the composite coating. And controlling the total thickness of the two layers of coating films to be 10-30 mu m. The baking temperature is 250-350 ℃, preferably 300 ℃. The double-layer coating design not only improves the thickness of the coating, but also enhances the crack resistance and the impact resistance of the multilayer structure. The first layer of coating plays roles of filling surface microdefects and initially blocking corrosive medium, and the second layer of coating is further reinforced and protected to form a compact and stable protective barrier. The reason that adopts the spraying mode rather than the dip-coating is that roller 3 and the outer race 4 of rolling are large and medium-sized structural members, and the appearance is complicated, weight is great, and the spraying technology is more suitable for on-the-spot operation, is convenient for regulate and control coating thickness and spraying angle, ensures that each position is scribbled evenly unanimously, avoids the dead angle to leak scribble or pile up too thick. The high-temperature double-curing process ensures that zinc-aluminum particles are fully arranged, improves the shielding effect and self-healing capacity of the coating, and obviously enhances the salt spray resistance and the wear resistance.

In this embodiment, the upper and lower brackets 5 serve as support members in the switch roller device, and are mainly used for fixing the position of the roller and carrying the installation and operation loads of the whole device. The structural member is generally complex in shape, wide in stress surface, frequent in installation operation and easy to cause abrasion of a surface coating due to collision, friction and the like. In addition, it is exposed to outdoor environments, also subject to the effects of moisture, corrosion, ultraviolet radiation, and the like. Therefore, in order to achieve the corrosion resistance, surface hardness, aesthetic property and weather resistance, the upper and lower brackets 5 are treated by adopting a composite coating protection process of 'one-coating one-baking Dacromet+silver paint+varnish'.

After thermal degreasing and shot blasting treatment are completed, a layer of Dacromet solution is uniformly sprayed on the upper and lower supports 5 by using a high-pressure spray gun, so that the coating covers all structural surfaces and mounting hole sites. After the spraying is finished, the mixture is sent into a high-temperature oven to be baked and cured for 20 minutes at the temperature of 300 ℃ to form a first Dacromet inorganic coating, and the thickness is controlled to be 5-15 mu m. This layer provides basic zinc-aluminum composite corrosion protection and provides a good adhesion substrate for the subsequent organic paint layer. And cooling the Dacromet coating, continuing to spray a second layer, using a silver paint solution, and baking for 20 minutes at 300 ℃ again after spraying to form a second layer of metal effect coating, wherein the thickness is controlled to be 20-30 mu m, and the surface decoration and covering power are improved. And finally, carrying out third spraying treatment after the silver paint is solidified and cooled, sealing and coating by using a transparent varnish solution, and carrying out high-temperature baking again to form a surface protection coating with the thickness of 15-35 mu m. The total thickness of the final composite coating can reach 40-80 mu m.

The composite technology combines the corrosion resistance of the Dacromet inorganic coating, the covering decorative property of the silver paint and the wear-resistant protective property of the varnish, so that the upper bracket and the lower bracket 5 have higher surface hardness and impact resistance while meeting the long-term outdoor protection requirement. The Dacromet layer provides a basic cathodic protection and rust prevention barrier, the silver paint enhances ultraviolet resistance through metal reflection, and the varnish sealing layer prevents water vapor infiltration and particle abrasion damage, so that a triple protection system of 'bottom layer corrosion prevention-middle layer decoration-surface layer sealing' is formed. In addition, the process enables the surface of the bracket to form a silver gray bright coating, thereby improving the appearance consistency of the whole machine and facilitating the later maintenance and inspection. Compared with the traditional single-layer paint surface protection or pure Dacromet treatment mode, the three-layer composite system is more suitable for metal structural members which are frequently installed, have complex structures and have requirements on appearance, and particularly in high-humidity, high-pollution or multiple loading and unloading scenes, the coating is not easy to peel off, crack or fade, and the service life of the upper bracket 5 and the lower bracket 5 and the protection integrity of the whole machine are obviously improved.

According to the scheme, the targeted anti-corrosion technology is implemented on different parts of the turnout roller device, the structural characteristics, performance requirements and service environments of all the parts are fully considered, and therefore the organic unification of anti-corrosion performance, assembly precision, appearance quality and cost control is achieved. Firstly, the bolts and nuts are treated by a one-dipping one-baking Dacromet process, so that the thickness of the coating is controlled to be 8-16 mu m. The process coating is uniform in distribution and strong in adhesive force, has good corrosion resistance, can effectively avoid the interference problem of screw thread fit caused by excessive thickness of the coating, ensures that the fastener can maintain good assembly performance while meeting long-term corrosion resistance requirements, and improves fastening reliability and service life. And secondly, a roll shaft and a rolling outer ring are used as motion and transmission parts, and a two-coating two-baking Dacromet process is adopted to form a double-layer anti-corrosion coating structure with the thickness of 10-30 mu m. The coating system has higher compactness and corrosion resistance, can effectively prevent corrosion and coating from falling off under long-term dynamic load and severe environment, delays metal fatigue, simultaneously endows the surface of the part with uniform silver gray appearance, and improves the appearance quality and engineering image of the whole product. Finally, the upper bracket and the lower bracket adopt a three-layer composite coating structure of one-coating one-baking Dacromet, silver paint and varnish, and the total thickness of the final coating can reach 40-80 mu m. The composite system integrates inorganic corrosion resistance, metal decoration and wear-resistant seal layer, not only remarkably improves the corrosion resistance of the bracket, but also enhances the surface hardness and scratch resistance, can effectively solve the abrasion problem caused by mechanical rubbing and long-term exposure in the installation process, and simultaneously has the advantages that the surface of the bracket is more attractive and glossy due to the superposition effect of the silver powder layer and the varnish, and good visual consistency and brand recognition are realized. In conclusion, the anti-corrosion process scheme realizes accurate matching of coating performance and component functions through a differential treatment means, optimizes process cost and production efficiency while guaranteeing the overall durability of the turnout roller device, and has good engineering popularization prospect and application value.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The anti-corrosion method of the turnout roller device is characterized by comprising the following steps of:

The turnout roller device is split into parts, wherein the parts comprise bolts (1), nuts (2), roller shafts (3), rolling outer rings (4) and upper and lower brackets (5);

carrying out thermal degreasing treatment on the bolts (1), the nuts (2), the roller shafts (3), the rolling outer rings (4) and the upper and lower brackets (5);

Carrying out surface cleaning treatment on the bolt (1), the nut (2), the roll shaft (3), the rolling outer ring (4) and the upper and lower brackets (5) after the thermal degreasing treatment;

Different parts of the turnout roller device are coated with different coatings for corrosion prevention treatment respectively, and the turnout roller device comprises a bolt (1) and a nut (2) which are subjected to single-layer dip coating and curing for corrosion prevention treatment, a roller shaft (3) and a rolling outer ring (4) which are subjected to double-layer double-coating and curing for corrosion prevention treatment, and an upper bracket and a lower bracket (5) which are subjected to single-layer spray coating and curing for corrosion prevention treatment.

2. The method for preserving a switch roller device according to claim 1, wherein,

The single-layer dip-coating curing anti-corrosion treatment comprises the following steps:

soaking the bolt (1) and the nut (2) in Dacromet solution;

after soaking, taking out the bolt (1) and the nut (2) and spin-drying;

And then baking and curing are carried out, so that the coating is tightly adhered to the bolt (1) and the nut (2) to form the anti-corrosion coating.

3. The method for preserving a switch roller device according to claim 1, wherein,

The double-layer recoating curing anti-corrosion treatment comprises the following steps:

uniformly spraying the dacromet solution on the roll shaft (3) and the rolling outer ring (4) by using a spraying gun;

After spraying, carrying out primary baking, solidifying and cooling to form a first layer of coating, wherein the thickness of the first layer of coating is 5-15 mu m;

After the first curing is finished, performing second spraying, and uniformly spraying the dacromet solution by using a spraying gun;

And after the second spraying, baking, solidifying and cooling again to form a second coating, so that the total thickness of the first coating and the second coating is 10-30 mu m.

4. A method for protecting a switch roller device according to claim 3, wherein,

The single-layer spraying curing anti-corrosion treatment comprises the following steps:

uniformly spraying the dacromet solution on the upper and lower brackets (5) by using a spray gun;

And after spraying, baking, solidifying and cooling to form a first layer of coating on the surfaces of the upper bracket (5) and the lower bracket, wherein the thickness of the first layer of coating is 5-15 mu m.

5. The method for preserving a switch roller device according to claim 4, wherein,

The upper and lower brackets (5) are subjected to single-layer spraying, curing and corrosion-preventing treatment, and then are subjected to paint spraying treatment, wherein the paint spraying treatment comprises the following steps:

After the first layer of coating on the surfaces of the upper bracket (5) and the lower bracket (5) is cured, spraying for the second time, and uniformly spraying silver paint solution on the upper bracket (5) and the lower bracket (5) by using a spraying gun;

After the second spraying, baking, solidifying and cooling are carried out, so that a second layer of coating is formed on the surfaces of the upper bracket (5) and the lower bracket, and the thickness of the second layer of coating is 20-30 mu m;

After the second layer of coating is cured, spraying for the third time, and uniformly spraying varnish solution by using a spraying gun;

and after the third spraying, baking, solidifying and cooling are carried out, so that a third layer of coating is formed on the surfaces of the upper bracket (5) and the lower bracket, and the thickness of the third layer of coating is 15-35 mu m.

6. The method for preserving a switch roller device according to claim 1, wherein,

The thermal degreasing treatment comprises the following steps of baking and degreasing bolts (1), nuts (2), roller shafts (3), rolling outer rings (4) and upper and lower brackets (5) at 300 ℃ by using natural gas as a heat source.

7. The method of preserving a switch roller assembly of claim 6 wherein:

the surface cleaning treatment comprises the following steps of performing shot blasting on a bolt (1), a nut (2), a roll shaft (3), a rolling outer ring (4) and an upper bracket and a lower bracket (5) by using GH steel grit with the hardness of 63-66 HRC and 80 meshes.

8. A method of preserving a switch roller assembly as claimed in any one of claims 1 to 4, wherein:

The baking temperature in the single-layer dip-coating curing anti-corrosion treatment, the double-layer multi-coating curing anti-corrosion treatment and the single-layer spray-coating curing anti-corrosion treatment is between 250 ℃ and 350 ℃.

9. The method of preserving a switch roller assembly of claim 2 wherein:

in the step of soaking the bolt (1) and the nut (2) in the Dacromet solution, the soaking time is 2-4 minutes.

10. The method of preserving a switch roller assembly of claim 2 wherein:

The thickness of the anti-corrosion coating of the bolt (1) and the nut (2) is controlled by the spin-drying time and the spin-drying speed, and the spin-drying process adopts the preset time and speed to enable the thickness of the anti-corrosion coating of the bolt (1) and the nut (2) to be 8-16 mu m.