Method for preventing water ingress in an oil film bearing

Abstract

The application discloses a method for preventing water from entering an oil film bearing, and belongs to the technical field of steel metallurgy. The method comprises the following steps: identifying thirteen water-entering points of a rolling mill oil film bearing and eight water-entering points of a rolling mill system pipeline, customizing sealing requirements and evaluation of the twenty-one water-entering points, formulating evaluation and maintenance standards for key components of the oil film bearing, formulating weekly evaluation according to the daily state of a water discharge branch pipe of the oil film bearing, and quickly checking the water-entering points according to the weekly evaluation, so that the water entering the oil film bearing can be timely warned and quickly identified and treated, and a large amount of water entering the oil film bearing can be avoided, oil is prevented from deteriorating and the oil film bearing is prevented from being damaged. Compared with a traditional simple management mode of replacing a water-oil seal of the oil film bearing and Morgan oil, the method forms a new management mode of effectively combining the oil film bearing and the Morgan system together, and can effectively prevent water from entering the oil film bearing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel metallurgy, in particular to a method for preventing water from entering an oil film bearing. BACKGROUND

[0002] The oil film bearing of a rolling mill is a radial sliding bearing with lubricating oil as the medium, which is widely used in modern large-scale, high-speed, heavy-load, continuous and automatic rolling mills. The oil film bearing has the characteristics of large load capacity, strong impact resistance, long service life and low friction coefficient. The working principle of the oil film bearing of the rolling mill is based on the dynamic pressure principle and the static pressure principle. The dynamic pressure oil film bearing forms a pressure oil film through the viscous fluid dynamic effect of lubricating oil, while the static pressure oil film bearing relies on externally supplied pressure oil to form a pressure oil film.

[0003] A method for judging water entering an oil film bearing through flow detection is disclosed in Chinese Patent No. CN110320031B. Flow meters and flow rate meters are added to the main oil inlet pipe and the oil return pipe of each oil film bearing of the rolling mill. Based on the measurement data of the flow meters and the flow rate meters, the oil inlet flow, the oil return flow, the oil inlet flow rate and the oil return flow rate of each oil film bearing are analyzed and compared to judge the water entering state of the oil film bearing. Through the form of time window, based on the ratio of the oil inlet flow and the oil return flow of each oil film bearing, the water entering state and the degradation order of each oil film bearing are sorted. Based on the analysis and comparison of the oil inlet flow rate and the oil return flow rate of each oil film bearing, the water entering condition of the bearing is judged. When the oil tank level remains unchanged, the water entering condition of the oil film bearing is judged by the change trend of the oil return flow rate. When the ratio of the oil return flow and the oil inlet flow exceeds the flow ratio threshold range or the ratio of the oil return flow rate and the oil inlet flow rate exceeds the flow rate ratio threshold range, an alarm is realized.

[0004] In the above-mentioned patent, flow meters and flow rate meters are installed in the system pipeline of the oil film bearing, which can directly monitor the water entering amount to judge whether there is abnormal water entering. However, there is no prevention for the water entering condition of the oil film bearing, which may cause oil deterioration and bearing damage. Therefore, the present application provides a method for preventing water from entering an oil film bearing. SUMMARY

[0005] The present application aims to provide a method for preventing water from entering an oil film bearing to solve the problems of the prior art.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0007] A method for preventing water from entering an oil film bearing, comprising the following steps:

[0008] S1: Identify thirteen water entry points of the rolling mill oil film bearing and eight water entry points of the rolling mill system pipeline, and formulate sealing requirements and component designation inspection, replacement and scrap standards for the twenty-one water entry points;

[0009] S2: Formulate evaluation, cleaning and maintenance standards for the cone sleeve, bushing and bearing seat in the key components of the oil film bearing, and separately manage the cone sleeve and bushing in four levels;

[0010] S3: Formulate assembly requirements for the oil film bearing and backup roll, and control the sealing locking force by limiting the pressure and size after the assembly of the oil film bearing;

[0011] S4: Formulate weekly evaluation according to the daily state of the oil film bearing drain branch, and systematically develop oil film water entry prevention and solution measures according to the weekly evaluation system.

[0012] Further, the thirteen water entry points of the rolling mill oil film bearing in S1 include the water seal, oil seal, aluminum ring, ceramic gland, ceramic gland O-ring gasket, oil inlet pipe joint, oil inlet pipe double wire, oil return pipe joint, oil return pipe flange, thrust gland O-ring gasket, thrust bearing oil inlet check valve joint, large cap O-ring gasket and large cap.

[0013] Further, the eight water entry points of the rolling mill system pipeline in S1 include the oil return hose, oil return pipe joint, oil return pipe gasket, thrust oil inlet joint, thrust oil inlet hose, oil inlet hose, oil inlet hose joint and oil inlet hose gasket.

[0014] Further, the cleaning steps of the cone sleeve and bushing in S2 are as follows:

[0015] S201: Soak the cone sleeve or bushing of the oil film bearing in the cleaning liquid for at least ten minutes, and then wipe it clean with non-woven fabric;

[0016] S202: Flush the small holes and grooves on the cone sleeve or bushing with a high-pressure spray gun, and then place them in a clean place to dry naturally.

[0017] Further, the cleaning steps of the bearing seat in S2 are as follows:

[0018] S211: First, flush the grooves, gaps and inner holes on the bearing seat with a high-pressure spray gun, then wipe it with non-woven fabric, and repeat the above operation until the bearing seat is clean;

[0019] S212: Apply a layer of Morgan oil evenly on the surface of the bearing seat inner hole, and ensure that there is no accumulated sludge in the pipeline and oil cavity.

[0020] Further, the assembly requirements in S3 include the following:

[0021] S301: Before installation, keep the water seal and the flatness of the support roller matching area in good condition, and evenly apply a layer of grease;

[0022] S302: Apply sealant when installing the end cover, and apply Morgan oil on the steel belt part when installing the DF seal;

[0023] S303: When assembling, the locking pressure is 186 bar and the locking size is 175 mm, the pressure is released after maintaining the pressure for 15 seconds, then the hydraulic locking trolley is started again, and the locking is repeated for 3 times.

[0024] Further, the daily state of the oil film bearing drain branch pipe in S4 includes: drain time of the branch pipe, disassembly level of the cone sleeve and the bushing, liquid level of the Morgan oil tank, water content of the Morgan oil product, kinematic viscosity of the Morgan oil product, acid value of the Morgan oil product and emulsion resistance of the Morgan oil product.

[0025] Compared with the prior art, the beneficial effects of the present application are:

[0026] 1. The present application identifies twenty-one water inlet points that may affect the normal operation of the oil film bearing in advance, and respectively formulates work standards for them, thereby improving the sealing of the water inlet points; for the cone sleeve, the bushing and the bearing seat in the key components of the oil film bearing, cleaning and maintenance standards are respectively formulated for them, and the cone sleeve and the bushing are separately managed in a graded manner, so that the sealing of the oil film bearing can be quickly and accurately judged; the pressure and the size are controlled, thereby improving the sealing and locking reliability of the oil film bearing and the support roller after assembly, and avoiding water inlet of the oil film bearing caused by the gap due to the axial force.

[0027] 2. The present application formulates weekly evaluation according to the daily state of the oil film bearing drain branch pipe, and according to the weekly evaluation, the water inlet points can be quickly investigated, so that the water inlet can be timely warned and quickly identified and treated, thereby avoiding a large amount of water inlet of the oil film bearing, deteriorating the oil product and damaging the oil film bearing. Compared with the traditional simple management mode of replacing the water oil seal and Morgan oil of the oil film bearing, the present application forms a new mode of effectively combining the oil film bearing and the Morgan system for management, which can effectively prevent the water inlet of the oil film bearing. BRIEF DESCRIPTION OF DRAWINGS

[0028] Fig. 1 The process flowchart of the embodiment of the present application is shown in the figure;

[0029] Fig. 2 The schematic diagram of eight water inlet points of the rolling mill system pipeline of the present application is shown in the figure;

[0030] Fig. 3 The schematic diagram of thirteen water inlet points of the rolling mill oil film bearing of the present application is shown in the figure. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] To solve the problem of oil deterioration and bearing damage caused by failure to prevent water ingress into the oil film bearing, please refer to Figs. 1-3 This patent specifically proposes a method for preventing water ingress into an oil film bearing, which mainly includes the following steps:

[0033] S1: Identify thirteen water ingress points in the rolling mill oil film bearings and eight water ingress points in the rolling mill system piping, and establish sealing requirements and component inspection, replacement, and scrapping standards for these twenty-one water ingress points;

[0034] The thirteen water inlet points of the S1 medium rolling mill oil film bearing include the water seal, oil seal, aluminum ring, ceramic gland, ceramic gland O-type gasket, oil inlet pipe joint, oil inlet pipe double wire, oil return pipe joint, oil return pipe flange, thrust gland O-type gasket, thrust bearing oil inlet check valve joint, large cap O-type gasket and large cap;

[0035] The eight water inlet points of the S1 rolling mill system pipeline include the oil return hose, oil return pipe joint, oil return pipe gasket, anti-thrust oil joint, anti-thrust oil hose, oil inlet hose, oil inlet hose joint and oil inlet hose gasket;

[0036] The requirements for the thirteen water inlet points of the rolling mill oil film bearings in S1 and the eight water inlet points of the rolling mill system pipelines are shown in Table 1 and Table 2 respectively.

[0037] Table 1

[0038]

[0039]

[0040]

[0041] Table 2

[0042]

[0043] S2: Develop evaluation, cleaning and maintenance standards for the taper sleeve, bushing and bearing seat, which are key components of oil film bearings, and implement four-level management for the taper sleeve and bushing separately;

[0044] The steps for cleaning the cone sleeve and bushing in S2 are as follows:

[0045] S201: Soak the cone sleeve or bushing of the oil film bearing in the cleaning solution for at least ten minutes, then wipe the cone sleeve or bushing clean with non-woven fabric;

[0046] S202: After washing the small holes and grooves on the cone sleeve or bushing with a high-pressure spray gun, place it in a clean place and wait for natural wind to dry, wherein the washing should be from inside to outside, from top to bottom, and the edges, corners, grooves and holes of the cone sleeve or bushing should be carefully checked and touched to avoid missing;

[0047] The bearing seat cleaning steps in S2 are as follows:

[0048] S211: First, use a high-pressure spray gun to wash the grooves, gaps and inner holes on the bearing seat, then wipe it with non-woven fabric, and repeat the above operation until the bearing seat is clean, wherein the washing should be from inside to outside, from top to bottom, and the edges, corners, grooves and holes on the bearing seat should be carefully checked and touched to avoid missing;

[0049] S212: Apply a layer of Morgan oil evenly on the surface of the bearing seat inner hole, and ensure that there is no accumulated oil sludge in the pipeline and oil cavity;

[0050] The four-level evaluation of the cone sleeve in S2 is as follows:

[0051] First: No abnormal wear, smooth outer surface, no hand feeling, direct use;

[0052] Second: 90% of the overall surface is smooth and free of scratches, with a roughness of less than 0.3 μm, or there is local rust on the outer surface, which can be repaired on site;

[0053] Third: Severe surface scratches, large area of rust on the inner and outer surfaces, returned to the factory for repair;

[0054] Fourth: Cracks, lack of meat, major scratches and other defects, outer diameter less than minimum size, no repair value, apply for scrap;

[0055] The four-level evaluation of the bushing in S2 is as follows:

[0056] First: No abnormal wear, smooth surface, can be used directly;

[0057] Second: There are slight scratches, burrs and other defects on the surface, and local marks on the babbitt surface, with a roughness of less than 0.8 μm, which can be repaired on site;

[0058] Third: Inner surface roughness > 0.8 μm; large area of scratches, flaky peeling, etc.; returned to the factory for repair;

[0059] Fourth: Major scratches, meat loss and other defects; outer diameter less than minimum size; alloy thickness exceeds 3 mm, repair more than twice, apply for scrap.

[0060] S3: Establish assembly requirements for the oil film bearing and support rollers. After the oil film bearing is assembled, the sealing locking force is controlled by limiting the pressure and size.

[0061] The assembly requirements in S3 include the following:

[0062] S301: Before installation, the flatness of the water seal and support roller matching area must be kept in good condition, and a layer of grease must be applied evenly.

[0063] S302: When installing the end cap, apply sealant. When installing the DF seal, apply Morgan oil to the steel belt and rotate the outer ring by hand to prevent the DF seal lip from folding.

[0064] S303: When assembling, if the locking pressure is required to be around 186 bar and the locking size is around 175mm-178mm, maintain the pressure for 15 seconds and then release the pressure, then start the hydraulic locking trolley and repeat the locking 3 times.

[0065] S4: Prepare weekly evaluations based on the daily status of the oil film bearing drain pipes, and then implement oil film water ingress prevention and solution measures based on the weekly evaluations;

[0066] The daily status of the oil film bearing drain branch in S4 includes: branch drain time, disassembly level of the taper sleeve and bushing, liquid level of the Morgan oil tank, water content of the Morgan oil, kinematic viscosity of the Morgan oil, acid value of the Morgan oil and anti-emulsification property of the Morgan oil.

[0067] Example 1:

[0068] As shown in Table 3 below, after the support rollers were replaced, the weekly evaluation of the oil film bearing showed that the F6 branch pipe drained water for 25 seconds and was in a yellow light warning, indicating that water had entered the F6 frame oil film bearing. The weekly evaluation showed that the oil film evaluation level and system oil parameters were normal. The oil film bearing cleaning, assembly operations and sealing status were all within the range. After checking the cause of the water ingress, it was determined that the thickness of the return oil pipe gasket in the eight water inlet points of the rolling mill system pipeline was 2mm smaller than the design and did not play a sealing role. At this time, the return oil pipe gasket was replaced, and finally the branch pipe drained water normally, thereby achieving timely warning of water ingress to the frame and quickly finding the water inlet point, avoiding the situation where a large amount of water enters the oil film bearing, deteriorating the oil quality, and causing damage to the oil film bearing, reducing the cost of spare parts for abnormal loss of the oil film bearing, and greatly improving the economic benefits.

[0069] Table 3

[0070]

[0071]

[0072] To sum up: the patent application proposes a method for preventing water from entering the oil film bearing, which formulates a weekly evaluation according to the daily state of the water discharge branch pipe of the oil film bearing, and can quickly check the water inlet point according to the weekly evaluation, so as to timely warn and quickly identify and handle the water inlet, and then avoid a large amount of water entering the oil film bearing, so as to avoid deteriorating the oil and damaging the oil film bearing. Compared with the traditional replacement of the water-oil seal and the simple management mode of the Morgan oil, the system forms a new mode of effective combination of the oil film bearing and the Morgan system for management, which can effectively prevent the water from entering the oil film bearing.

[0073] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can make equivalent replacement or change within the technical range disclosed by the present application according to the technical solution and the inventive concept of the present application, which should be covered within the protection scope of the present application.

Claims

1. A method for preventing water ingress into an oil film bearing, characterized by: The following steps are involved: S1: Identify thirteen water ingress points in the rolling mill oil film bearings and eight water ingress points in the rolling mill system piping, and establish sealing requirements and component inspection, replacement, and scrapping standards for these twenty-one water ingress points; S2: Develop evaluation, cleaning and maintenance standards for the taper sleeve, bushing and bearing seat, which are key components of oil film bearings, and implement four-level management for the taper sleeve and bushing separately; S3: Establish assembly requirements for the oil film bearing and support rollers. After the oil film bearing is assembled, the sealing locking force is controlled by limiting the pressure and size. S4: Prepare weekly evaluations based on the daily status of the oil film bearing drain pipes, and then implement oil film water ingress prevention and solution measures based on the weekly evaluations; The thirteen water inlet points of the S1 medium rolling mill oil film bearing include the water seal, oil seal, aluminum ring, ceramic gland, ceramic gland O-type gasket, oil inlet pipe joint, oil inlet pipe double wire, oil return pipe joint, oil return pipe flange, thrust gland O-type gasket, thrust bearing oil inlet check valve joint, large cap O-type gasket and large cap; The eight water inlet points of the S1 rolling mill system pipeline include the oil return hose, oil return pipe joint, oil return pipe gasket, anti-thrust oil joint, anti-thrust oil hose, oil inlet hose, oil inlet hose joint and oil inlet hose gasket; The assembly requirements in S3 include the following: S301: Before installation, the flatness of the water seal and support roller matching area must be kept in good condition, and a layer of grease must be applied evenly. S302: Apply sealant when installing the end cap, and apply Morgan oil to the steel belt when installing the DF seal. S303: When assembling, if the locking pressure is required to be 186 bar and the locking size is 175 mm, maintain the pressure for 15 seconds and then release the pressure, then start the hydraulic locking trolley and repeat the locking 3 times.

2. A method for preventing water ingress into an oil film bearing according to claim 1, characterized in that: The steps for cleaning the cone sleeve and bushing in S2 are as follows: S201: Soak the tapered sleeve or bushing of the oil film bearing in the cleaning solution for at least ten minutes, then wipe the tapered sleeve or bushing clean with a non-woven cloth; S202: After flushing the small holes and grooves on the cone sleeve or bushing with a high-pressure spray gun, place it in a clean place and wait for natural wind to dry it.

3. The method for preventing water ingress into an oil film bearing according to claim 1, wherein: The steps for cleaning the bearing seat in S2 are as follows: S211: First use a high-pressure spray gun to flush the grooves, gaps, and inner holes on the bearing seat, then scrub them with a non-woven cloth, and repeat the above steps until the bearing seat is clean. S212: Apply a layer of Morgan oil evenly on the inner surface of the bearing seat, and ensure that there is no sludge accumulated in the pipes and oil chamber.

4. The method for preventing water ingress into an oil film bearing according to claim 1, wherein: The daily status of the oil film bearing drain branch in S4 includes: branch drain time, disassembly level of the taper sleeve and bushing, liquid level of the Morgan oil tank, water content of the Morgan oil, kinematic viscosity of the Morgan oil, acid value of the Morgan oil and anti-emulsification property of the Morgan oil.

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