A lubrication device to reduce pitting defects on rail treads

Abstract

This utility model relates to a lubrication device for reducing pitting defects on rail treads. It includes a bearing housing with threaded holes, a pipe joint, a nut, and a water pipe. The bearing housing with threaded holes is installed in the vertical roll system of a universal rolling mill and is used to install the bearings of the vertical rolls. The pipe joint and nut are compatible in size, with the nut fitted on the outside of the pipe joint and connected to the threaded hole of the bearing housing through the nut. The pipe joint and water pipe are also compatible in size. During the rolling process of the rail, cooling water is smoothly delivered to the water spraying area through the water pipe. This utility model integrates a high-pressure water descaling device inside the vertical roll bearing housing without altering the existing main frame of the rolling mill. This allows for the immediate removal of iron oxide scale from the rail during the universal rolling process, and the water spray reduces the surface temperature rise of the vertical roll, decreases oxidation, forms a stable water film, and provides lubrication and cooling, ultimately eliminating pitting on the tread surface.

Description

Technical Field

[0001] This utility model relates to the field of steel rolling technology, and more specifically, to a lubrication device for reducing pitting defects on rail treads. Background Technology

[0002] Surface quality is crucial in rail production. Currently, although high-pressure water descaling devices are used to treat the primary iron oxide scale generated on rails and eliminate surface pitting to improve surface quality, in actual production, after subsequent universal rolling, secondary iron oxide scale continues to be generated due to dry friction between the vertical rolls and the rail head tread. This scale is eventually pressed into the rail by the universal rolling mill, forming pits that severely affect the surface quality of the rails.

[0003] Existing technologies attempt to reduce surface pitting by increasing the pressure of high-pressure water descaling. However, this only removes iron oxide scale once, and further increasing the descaling pressure approaches the equipment's limit, leading to deterioration in energy consumption, noise, and equipment lifespan. It still fails to solve the problem of iron oxide scale generated during subsequent rolling. Therefore, there is an urgent need to develop a device that can effectively solve the problem of surface pitting in rails during subsequent rolling processes. Utility Model Content

[0004] In view of the above-mentioned technical problems, a lubrication device for reducing pitting defects on rail treads is provided. This device is a high-pressure water descaling device installed on the vertical roll bearing seat of a universal rolling mill, used to eliminate pitting defects on rail treads caused by the indentation of secondary iron oxide scale during subsequent rolling.

[0005] The technical means adopted in this utility model are as follows: A lubrication device for reducing pitting defects on rail treads includes a bearing housing with threaded holes, a pipe joint, a nut, and a water pipe. The bearing housing with threaded holes is installed in the vertical roll system of a universal rolling mill and is used to install the bearings of the vertical rolls. The pipe joint is compatible with the nut in terms of specifications, and the nut is fitted on the outside of the pipe joint. The pipe joint is connected to the threaded hole of the bearing housing through the nut. The pipe joint is compatible with the water pipe in terms of size. During the process of rolling the rails by the vertical rolls, cooling water is smoothly delivered to the water spraying area through the water pipe.

[0006] Furthermore, the output end of the bearing housing with threaded holes is a nozzle, which is installed on the inner wall of the bearing housing and faces the vertical roller.

[0007] Furthermore, the nozzle is an I-shaped nozzle, which includes a central mounting base and a transverse connecting pipe connected to the mounting base, as well as two longitudinal connecting pipes of the same specification arranged perpendicular to the transverse connecting pipe at both ends. The longitudinal connecting pipes are divided by the connection point of the transverse connecting pipes, and at least one spray nozzle is provided at the upper and lower parts of the longitudinal connecting pipes.

[0008] Furthermore, the nozzle is a straight nozzle, which includes a central mounting base and a transverse connecting pipe connected to the mounting base. The transverse connecting pipe is symmetrically arranged about the longitudinal centerline of the central mounting base, and each transverse connecting pipe has at least one spray nozzle.

[0009] Compared with the prior art, the present invention has the following advantages: Without changing the main frame of the existing rolling mill, the present invention integrates a set of high-pressure water descaling device inside the vertical roll bearing seat, so as to remove the iron oxide scale on the rail instantly when it is generated during the rolling process of the universal rolling mill. In addition, the water spray can reduce the temperature rise of the vertical roll surface, reduce oxidation, form a stable water film, play a lubricating and cooling role, and ultimately eliminate pitting on the tread surface. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] Figure 2 This is a side view of the nozzle of this utility model.

[0013] In the diagram: 1. Fixing bolt; 2. Horizontal connecting pipe; 3. Spray nozzle; 4. Spray head connector; 5. Bearing seat. Detailed Implementation

[0014] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0016] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0017] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0018] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0019] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0020] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0021] This utility model discloses a lubrication device for reducing pitting defects on rail treads, including a bearing housing with threaded holes, a pipe joint, a nut, and a water pipe. The bearing housing with threaded holes is installed in the vertical roll system of a universal rolling mill and is used to install the bearing of the vertical roll. The pipe joint is compatible with the nut in terms of specifications, and the nut is fitted on the outside of the pipe joint. The nut connects to the threaded hole of the bearing housing. The pipe joint is compatible with the water pipe in terms of size. During the process of rolling the rail with the vertical roll, cooling water is smoothly transported to the water spraying part through the water pipe.

[0022] The universal rolling mill used in this invention mainly consists of a flat roll system, a vertical roll system, and a guide system. The flat roll system and the vertical roll system directly contact the workpiece and complete the rolling deformation. The threaded bearing housing involved in this lubrication device is applied to the vertical roll system of the universal rolling mill. The vertical roll system consists of vertical rolls and a vertical roll box. The vertical rolls are assembled inside the vertical roll box, and the threaded bearing housing is used to install the bearings of the vertical rolls, ensuring stable rotation of the vertical rolls during rolling. In actual installation, the bearings are installed inside the threaded bearing housing, and the bearings are securely installed by the engagement of nuts with the threaded holes of the bearing housing. Then, the bearing housing with the bearings and related components installed is installed into the vertical roll box, allowing the vertical rolls to operate stably under the support of the bearings. Together with the flat roll system, this forms a rail deformation die system, performing rolling operations on the rail flange portion processed on the side of the vertical rolls.

[0023] The threaded hole serves as a water channel. Furthermore, the output end of the bearing housing with the threaded hole is a nozzle, which is installed on the inner wall of the bearing housing and faces the vertical roller.

[0024] Furthermore, such as Figure 1 , Figure 2 As shown, the nozzle is an I-shaped nozzle, comprising a central mounting base, a transverse connecting pipe 2 connected to the mounting base, and two identical longitudinal connecting pipes arranged perpendicularly to the transverse connecting pipe at both ends. The longitudinal connecting pipes are divided by the connection point of the transverse connecting pipes, and each longitudinal connecting pipe has at least one spray nozzle 3 at its upper and lower parts. The central mounting base is surrounded by fixing bolts 1, which are used to mount the nozzle connecting seat 4 connected to the bearing seat 5, allowing for disassembly and assembly, and enabling switching between the nozzle and the linear nozzle described below.

[0025] Furthermore, the nozzle is a straight nozzle, which includes a central mounting base and a transverse connecting pipe connected to the mounting base. The transverse connecting pipe is symmetrically arranged about the longitudinal centerline of the central mounting base, and each transverse connecting pipe has at least one spray nozzle.

[0026] The method of using the lubrication device for reducing pitting defects on rail treads according to the present invention includes the following steps: Drill and tap threaded holes on the side of the bearing housing; Connect the water pipe to the pipe fitting with adhesive. After the adhesive has cured, put the nut on the outside of the pipe fitting. Connect the pipe fitting with the nut to the threaded hole of the bearing housing. During the rolling process, the appropriate nozzle is selected for different types of rails; Before starting the universal rolling mill, adjust the water pressure to the preset value according to the specifications of the vertical roll diameter; During the rolling process, the water pressure is monitored in real time to ensure that it remains within the set range.

[0027] Furthermore, when the roller diameter is 690-710mm, the water pressure is adjusted to 0.95~1MPa; when the roller diameter is 711-790mm, the water pressure is adjusted to 0.8-0.85MPa.

[0028] As an expandable implementation, the above-mentioned water pressure regulation can be automated. Specifically, a pressure sensor is installed on the water pipe, and based on the water pressure parameters obtained by the pressure sensor, the water pressure output is adjusted to a fixed value within the above-mentioned range, according to the vertical roller information of different roller diameters input by the system.

[0029] Furthermore, for the produced rails, such as channel rails and turnout rails, I-beam type nozzles are selected; for 60KG / 50KG heavy rails, straight nozzles are used. These nozzles can be quickly replaced and, in conjunction with water pressure adjustment based on roller diameter, can adapt to the production of various types of rails.

[0030] As another possible implementation, the number of nozzles is multiple, with one nozzle aligned with the rail head tread to peel off the initial iron oxide scale, and the other nozzles being the aforementioned I-shaped nozzles or straight nozzles. The water spraying components form a fan-shaped water curtain to cool the vertical rollers and wash away the peeled material.

[0031] In the above-described extended scenario, the threaded hole is at least two interconnected holes, one of which is connected to the nozzle aligned with the rail head tread surface, and the other is connected to the aforementioned I-shaped nozzle or straight nozzle.

[0032] As a further extension, a distributor and needle valve are installed on the unbranched main pipeline of the threaded hole, so that the upper nozzles account for 60-70% of the flow and the lower spray nozzles account for 30-40% of the flow, ensuring descaling while avoiding water splashing. The continuous water film reduces the surface temperature of the vertical roller by 80-120°C, effectively extending the roller's lifespan.

[0033] During the rolling process, when the universal rolling mill starts operating and the vertical rolls roll the rails along with the mill, the lubrication device begins its water spraying function. Part of the cooling water exiting the outlet is sprayed onto the rail surface at a specific angle and pressure through nozzles aimed at the rail head tread, providing initial rinsing and removing some of the iron oxide scale adhering to the surface. The remaining water flows through the aforementioned I-shaped or straight nozzles to precisely lubricate and rinse specific areas of the rail, especially near the contact area between the vertical rolls and the rail. The pipe that delivers the water to the lower spray nozzles is fixed to the inner wall of the bearing housing with screws, ensuring that it will not shift or fall off under the impact of the water flow, thus stably delivering water to the I-shaped or straight nozzles.

[0034] During the rolling process, continuous cooling water spraying can promptly remove newly formed iron oxide scale, preventing it from being pressed into the rail surface and forming pits during subsequent rolling. Simultaneously, the cooling water also cools the vertical rolls, preventing excessively high roll temperatures from accelerating oxidation of the rail surface.

[0035] This invention features a simple structure, utilizing the existing space of the bearing housing without adding external supports, and reducing downtime to less than 2 hours. It directly sprays high-pressure water at the rolling point to block oxide scale adhesion, dynamically descaling at the rolling point and inhibiting oxide scale formation at its source. This solves the problem of traditional descaling methods that only treat the initial surface.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A lubricating device for reducing rail head pitting defects, characterised in that, The system includes a bearing housing with threaded holes, a pipe fitting, a nut, and a water pipe. The bearing housing with threaded holes is installed in the vertical roll system of the universal rolling mill. The bearing housing is used to install the bearing of the vertical roll. The pipe fitting is compatible with the nut in terms of specifications. The nut is fitted on the outside of the pipe fitting and is connected to the threaded hole of the bearing housing through the nut. The pipe fitting is compatible with the water pipe in terms of size. During the process of the vertical roll rolling the rail, the cooling water is smoothly transported to the water spraying part through the water pipe.

2. The lubricating device according to claim 1, characterized in that The output end of the bearing housing with threaded holes is a nozzle, which is installed on the inner wall of the bearing housing and faces the vertical roller.

3. The lubricating device of claim 2, wherein The nozzle is an I-shaped nozzle, which includes a central mounting base and a transverse connecting pipe connected to the mounting base, as well as two longitudinal connecting pipes of the same specification arranged perpendicular to the transverse connecting pipe at both ends. The longitudinal connecting pipes are divided by the connection point of the transverse connecting pipes, and at least one water nozzle is provided at the upper and lower parts of the longitudinal connecting pipes.

4. The lubricating device of claim 2, wherein The nozzle is a straight nozzle, which includes a central mounting base and a transverse connecting pipe connected to the mounting base. The transverse connecting pipe is symmetrically arranged about the longitudinal centerline of the central mounting base, and each transverse connecting pipe has at least one spray nozzle.

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