Method for preventing water from entering oil film bearing

Abstract

The invention discloses a method for preventing water from entering an oil film bearing, and belongs to the technical field of ferrous metallurgy. The method comprises the following steps: identifying thirteen water inlet points of the rolling mill oil film bearing and eight water inlet points of a rolling mill system pipeline, customizing sealing requirements and evaluation for the twenty-one water inlet points, formulating evaluation and maintenance standards for key parts of the oil film bearing, formulating weekly evaluation according to the daily state of a water drainage branch pipe of the oil film bearing, and formulating the water drainage branch pipe of the rolling mill. The water inlet point can be quickly checked according to the weekly evaluation, so that early warning can be performed in time, and water inlet can be quickly recognized and treated, and therefore, oil deterioration and oil film bearing damage caused by the fact that a large amount of water enters the oil film bearing can be avoided, and compared with a traditional simple management mode of replacing oil film bearing water and oil seals and Morgan oil, the method has the advantage of high efficiency. The system forms a new mode that the oil film bearing and the Morgan system are effectively combined for management, and water can be effectively prevented from entering the oil film bearing.

Description

Technical Field

[0001] The invention relates to the technical field of iron and steel metallurgy, and in particular to a method for preventing water from entering an oil film bearing. Background Art

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

[0003] A Chinese patent with publication number CN110320031B discloses a method for judging water ingress into an oil film bearing by flow detection, wherein a flow meter and a flow meter are added to the main oil inlet pipe and the oil return pipe of each rolling mill oil film bearing, and the water ingress state of the oil film bearing is judged by analyzing and comparing the oil inlet flow, oil return flow, oil inlet flow rate and oil return flow rate of each oil film bearing based on the measurement data of the flow meter and the flow meter; the water ingress state and degradation of each oil film bearing are ranked based on the ratio of the oil inlet flow to the oil return flow of each oil film bearing in the form of a time window; the water ingress state of the bearing is judged based on the analysis and comparison of the oil inlet flow rate and the oil return flow rate of each oil film bearing; when the oil tank liquid level remains unchanged, the water ingress state of the oil film bearing is judged by the change trend of the return oil flow rate; by setting the flow ratio and flow rate ratio threshold range, when the ratio of the return oil volume to the oil inlet volume exceeds the flow ratio threshold range or the ratio of the return oil flow rate to the oil inlet flow rate exceeds the flow rate ratio threshold range, an alarm reminder is implemented.

[0004] In the above patent, flow meters and flow meters are installed in the system pipelines of the oil film bearing, which can directly monitor the water inflow, so as to determine whether there is abnormal water inflow. However, there is a problem that no prevention is taken for water inflow into the oil film bearing, which may easily lead to oil deterioration and bearing damage. In view of this, this patent specifically proposes a method for preventing water inflow into the oil film bearing. Summary of the invention

[0005] The purpose of the present invention is to provide a method for preventing water from entering an oil film bearing, so as to solve the shortcomings of the prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A method for preventing water ingress into an oil film bearing comprises the following steps:

[0008] S1: Identify thirteen water ingress points in the rolling mill oil film bearings and eight water ingress points in the rolling mill system pipelines, and formulate sealing requirements and component inspection, replacement and scrapping standards for these twenty-one water ingress points;

[0009] S2: Establish evaluation, cleaning and maintenance standards for the taper sleeve, bushing and bearing seat among the key components of the oil film bearing, and separately implement four-level management for the taper sleeve and bushing;

[0010] S3: Formulate assembly requirements for oil film bearings and support rollers, and control the sealing locking force by limiting pressure and size after the oil film bearings are assembled;

[0011] S4: Make weekly evaluations based on the daily status of the oil film bearing drain pipes, and then systematically implement measures to prevent and resolve oil film water ingress based on the weekly evaluations.

[0012] Furthermore, the thirteen water inlet points of the S1 rolling mill oil film bearing include 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.

[0013] Furthermore, the eight water inlet points of the rolling mill system pipeline in S1 include an oil return hose, an oil return pipe joint, an oil return pipe sealing gasket, an anti-thrust oil joint, an anti-thrust oil hose, an oil inlet hose, an oil inlet hose joint and an oil inlet hose sealing gasket.

[0014] Further, the steps for cleaning 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 solution for at least ten minutes, and then wipe the cone sleeve or bushing clean with a non-woven cloth;

[0016] 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.

[0017] Furthermore, the steps for cleaning the bearing seat in S2 are as follows:

[0018] 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;

[0019] 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 pipeline and oil cavity.

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

[0021] S301: Before installation, the flatness of the water seal and support roller matching area should be kept good, and a layer of grease should be evenly applied;

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

[0023] S303: When assembling, the locking pressure needs to be 186 bar and the locking size needs to be 175 mm. Maintain the pressure for 15 seconds and then release it. Then start the hydraulic locking trolley and repeat the locking 3 times.

[0024] Furthermore, the daily status of the oil film bearing drain branch pipe in S4 includes: branch pipe drain time, disassembly level of the cone sleeve and the 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.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention identifies in advance 21 water inlet points that may affect the normal operation of the oil film bearing, and formulates work standards for them respectively, thereby improving the sealing of the water inlet points; for the taper sleeve, bushing and bearing seat among the key components of the oil film bearing, cleaning and maintenance standards are formulated respectively, and the taper sleeve and bushing are separately graded and managed, so that the sealing of the oil film bearing can be quickly and accurately judged; the pressure and size are controlled, so as to improve the reliability of the sealing and locking after the oil film bearing and the support roller are assembled, and avoid water intrusion into the oil film bearing caused by the gap caused by the axial force.

[0027] 2. The present invention formulates a weekly evaluation based on the daily status of the oil film bearing drain branch pipe. According to the weekly evaluation, the water inlet point can be quickly checked, so as to timely warn and quickly identify and deal with the water inlet, thereby avoiding a large amount of water ingress into the oil film bearing, which deteriorates the oil quality and damages the oil film bearing. Compared with the traditional simple management mode of replacing the oil film bearing water seal and Morgan oil, the system has formed a new mode of effective combination of oil film bearing and Morgan system management, which can effectively prevent water ingress into the oil film bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a process flow chart of an embodiment of the present invention;

[0029] Figure 2 It is a schematic diagram of eight water inlet points of the rolling mill system pipeline of the present invention;

[0030] Figure 3 It is a schematic diagram of thirteen water inlet points of the rolling mill oil film bearing of the present invention. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0032] To solve the problem of oil deterioration and bearing damage due to failure to prevent water ingress to oil film bearings, please refer to Figure 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 pipelines, and formulate 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 rolling mill oil film bearing include 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 return oil hose, return oil pipe joint, return oil 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: Establish evaluation, cleaning and maintenance standards for the taper sleeve, bushing and bearing seat among the key components of the oil film bearing, and separately implement four-level management for the taper sleeve and bushing;

[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, and then wipe the cone sleeve or bushing clean with a non-woven cloth;

[0046] 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. When flushing, it is necessary to flush from the inside to the outside and from top to bottom in sequence. Carefully check and touch the edges, corners, grooves, and holes of the cone sleeve or bushing to prevent omissions;

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

[0048] S211: First use a high-pressure spray gun to flush the grooves, gaps and inner holes on the bearing seat, then scrub with a non-woven cloth, and repeat the above steps until the bearing seat is clean. When flushing, flush from the inside out and from top to bottom. Carefully check and touch the edges, corners, grooves and holes on the bearing seat to avoid missing any.

[0049] 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 pipeline and oil cavity;

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

[0051] Level 1: No abnormal wear, smooth outer surface, no feel when touched, can be used directly;

[0052] Level 2: The overall surface is 90% smooth and scratch-free, with a roughness of less than 0.3μm, or there is local rust on the outer surface, which needs to be repaired on site;

[0053] Level 3: Severe surface scratches, large areas of rust on the inner and outer surfaces, return to the factory for repair;

[0054] Level 4: There are defects such as cracks, missing meat, major scratches, etc. The outer diameter is smaller than the minimum size, there is no repair value, and it is applied for scrapping;

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

[0056] Level 1: No abnormal wear, smooth surface, can be used directly;

[0057] Level 2: There are slight scratches and burrs on the surface, local marks on the surface of Babbitt alloy, the roughness is less than 0.8μm, and it needs to be repaired on site;

[0058] Level 3: Inner surface roughness> 0.8μm; large area scratches, flaking, etc.; return to the factory for repair;

[0059] Level 4: Major scratches, flesh loss and other defects; outer diameter is smaller than the minimum size; alloy thickness exceeds 3mm, repairs are made more than twice, and application for scrapping is required.

[0060] S3: Formulate assembly requirements for oil film bearings and support rollers, and control the sealing locking force by limiting pressure and size after the oil film bearings are assembled;

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

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

[0063] S302: When installing the end cover, 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 about 186 bar and the locking size is about 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: Make 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 pipe in S4 includes: branch pipe drain time, disassembly level of cone sleeve and bushing, liquid level of Morgan oil tank, water content of Morgan oil, kinematic viscosity of Morgan oil, acid value of Morgan oil and anti-emulsification property of Morgan oil.

[0067] Embodiment 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 cleaning, assembly operations and sealing status of the oil film bearing were checked to be within the range. After checking the cause of the water ingress, it was confirmed that the thickness of the return oil pipe sealing 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 sealing 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 abnormal loss spare parts for the oil film bearing, and greatly improving the economic benefits.

[0069] Table 3

[0070]

[0071]

[0072] To sum up: this patent invention proposes a method for preventing water ingress into oil film bearings. By formulating a weekly evaluation based on the daily status of the oil film bearing water drain branch pipe, the water ingress point can be quickly checked based on the weekly evaluation, so that timely warning can be given and water ingress can be quickly identified and dealt with, thereby avoiding large amounts of water ingress into the oil film bearing, which would deteriorate the oil quality and damage the oil film bearing. Compared with the traditional simple management mode of replacing the oil film bearing water seal and Morgan oil, the system has formed a new management mode that effectively combines the oil film bearing and the Morgan system, which can effectively prevent water ingress into the oil film bearing.

[0073] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for preventing water ingress into an oil film bearing, characterized in that: 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 pipelines, and formulate sealing requirements and component inspection, replacement and scrapping standards for these twenty-one water ingress points; S2: Establish evaluation, cleaning and maintenance standards for the taper sleeve, bushing and bearing seat among the key components of the oil film bearing, and separately implement four-level management for the taper sleeve and bushing; S3: Formulate assembly requirements for oil film bearings and support rollers, and control the sealing locking force by limiting pressure and size after the oil film bearings are assembled; S4: Make 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.

2. A method for preventing water ingress into an oil film bearing as claimed in claim 1, characterized in that: The thirteen water inlet points of the S1 medium rolling mill oil film bearing include 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.

3. A method for preventing water ingress into an oil film bearing as claimed in claim 1, characterized in that: The eight water inlet points of the S1 rolling mill system pipeline include the return oil hose, the return oil pipe joint, the return oil pipe sealing gasket, the anti-thrust oil joint, the anti-thrust oil hose, the oil inlet hose, the oil inlet hose joint and the oil inlet hose sealing gasket.

4. A method for preventing water ingress into an oil film bearing as claimed in claim 1, characterized in that: The steps for cleaning the cone sleeve and bushing in S2 are as follows: S201: Soak the cone sleeve or bushing of the oil film bearing in the cleaning solution for at least ten minutes, and then wipe the cone 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.

5. A method for preventing water ingress into an oil film bearing as claimed in claim 1, characterized in that: 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 pipeline and oil cavity.

6. A method for preventing water ingress into an oil film bearing as claimed in claim 1, characterized in that: The assembly requirements in S3 include the following: S301: Before installation, the flatness of the water seal and support roller matching area should be kept good, and a layer of grease should be evenly applied; S302: When installing the end cover, apply sealant, and when installing the DF seal, apply Morgan oil to the steel belt; S303: When assembling, the locking pressure needs to be 186 bar and the locking size needs to be 175 mm. Maintain the pressure for 15 seconds and then release it. Then start the hydraulic locking trolley and repeat the locking 3 times.

7. A method for preventing water ingress into an oil film bearing as claimed in claim 1, characterized in that: The daily status of the oil film bearing drain branch in S4 includes: branch drain time, disassembly level of cone sleeve and bushing, liquid level of Morgan oil tank, water content of Morgan oil, kinematic viscosity of Morgan oil, acid value of Morgan oil and anti-emulsification property of Morgan oil.

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