Rolling bearing lubrication state regulation method

Abstract

The present application belongs to the technical field of lubrication regulation of rolling bearing, in particular to a kind of lubrication state regulation method of rolling bearing, the noise, vibration, temperature rise, torque etc. lubrication state that appears in the operation process of rolling bearing is monitored in real time, according to monitoring result and lubrication failure mode, real-time supplement lubricant, when supplementing, grease and lubricating oil are alternately supplied, to repair the lubricating deposit film and lubricating oil consumed in the process of lubrication, make rolling bearing long-term in effective lubrication state, avoid abnormal shutdown, at the same time, according to monitoring result, the service life of rolling bearing can be effectively estimated;In view of the film forming mechanism and evolution recession process analysis of grease, the lubrication mode of alternately supplying grease and lubricating oil is proposed for centralized lubrication, the operation process is simple, the principle is scientific and reliable, and it is verified that the lubricant can be in long-term supply and loss imbalance state in the track.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of lubrication regulation of rolling bearings, and particularly relates to a lubrication state regulation method of rolling bearings, which prolongs the service life of rolling bearings and reduces the operation energy consumption of rolling bearings by improving the supply mode of rolling bearings. BACKGROUND

[0002] The long-term operation state of rolling bearings is closely related to the lubrication state. When the rolling bearings are in high-speed operation or low-temperature operation state, the loss rate and backfill rate of lubricants in the track are low, and the oil-starved lubrication phenomenon is easily caused by insufficient oil supply at the inlet. Optimizing the inherent structural parameters of rolling bearings and adjusting the properties of lubricants are effective ways to improve the lubrication state. In addition, the centralized lubrication supply system can directly provide sufficient lubricants for the lubrication track in a timed, quantitative and fixed-point supply mode, meet the oil supply conditions of rolling elements and inner and outer rings of rolling bearings, improve the lubrication state of rolling bearings, and effectively prolong the service life and operation state of rolling bearings.

[0003] The centralized lubricating supply method adopted in the prior art avoids the problem of uncertain lubricating grease supply caused by manual lubricating grease filling, but cannot determine the single lubricating grease supply amount. For example, a centralized lubricating oil supply device disclosed in Chinese Patent 202310260744.6 includes an oil storage system, a main and auxiliary oil pump switching and pressure regulating system, a cooling system, and a temporary oil supply system. The oil storage system is provided with at least one set according to the type of lubricating oil. The oil storage system includes an oil tank heater, an oil tank, an oil tank filter, and an exhaust fan. Each oil tank stores different types of lubricating oil. The main and auxiliary oil pump switching and pressure regulating system includes a variable frequency oil pump pre-filter group, a variable frequency oil pump pre-stop valve, a variable frequency oil pump, a variable frequency oil pump post-stop valve, a lubrication point oil regulating valve, a lubrication point oil pressure gauge, a compressor main oil pump, a compressor, a compressor main oil pump outlet check valve, an oil pump outlet pressure regulating valve, and a variable frequency oil pump outlet check valve. The oil tank is connected to the variable frequency oil pump through a pipeline. The inlet of the variable frequency oil pump is connected to the inlet of the compressor main oil pump. The outlet of the variable frequency oil pump is connected to the outlet of the compressor main oil pump. The variable frequency oil pump and the compressor main oil pump are connected to complete oil supply switching. The pipeline connection between the variable frequency oil pump and the compressor main oil pump is connected to the cooling system and the temporary oil supply system at the rear. The cooling system and the temporary oil supply system are connected to the compressor at the rear. A double-line centralized lubricating system disclosed in Chinese Patent 202320122349.7 includes a grease pump for pumping lubricating grease from an oil tank storing lubricating grease, including a plunger pair assembly; a reversing module having a first working oil port, a second working oil port, an oil inlet supplied with lubricating grease by the grease pump, and at least one oil return port communicating with the oil tank. The reversing module has a first state in which the first working oil port communicates with the oil return port and the second working oil port communicates with the oil inlet, and a second state in which the first working oil port communicates with the oil inlet and the second working oil port communicates with the oil return port; two main oil paths respectively communicating with the first and second working oil ports; further comprising: at least one progressive distributor is arranged on at least one of the two main oil paths, one of the two main oil paths is used to supply lubricating grease to the lubrication point of the easy-to-hit area of the equipment to be lubricated, and the other is used to supply lubricating grease to the remaining lubrication points of the equipment to be lubricated; a controller for controlling the time when the reversing module is in the first state and the second state; a fault detection module for detecting whether the two main oil paths are faulty. When the single supply amount is small, the insufficient lubrication effect will cause severe friction on the surface of the rolling bearing, and micro-electric corrosion and micro-cracks will occur on the rolling elements and the inner and outer rings of the rolling bearing; when the single supply amount is too large, the rolling bearing running resistance will increase, resulting in a large temperature rise, which will cause the lubricating grease to be heat aged, resulting in lubrication failure. At the same time, too much lubricating grease will damage the sealing structure of the rolling bearing, seriously reducing the service life of the rolling bearing.

[0004] The internal rolling bearing grease is hardened due to a large amount of lubricating oil precipitated in a long-term operation process, and the fluidity is greatly reduced. In fact, there is a lubrication evolution degradation mechanism in grease lubrication. A large amount of lubricating oil is precipitated due to shearing and high temperature in the early stage of movement, so that the lubricant backfilling amount is insufficient and is in an oil-starved lubrication state. When in a serious oil-starved state, the lubrication state can be improved by providing lubricating grease to the internal rolling bearing in a centralized grease supply mode. However, long-term grease supply will cause the temperature to rise, and a large amount of lubricating grease will accumulate in the rolling bearing chamber, which is not conducive to heat dissipation. The oil layer in the grease lubrication process is mainly composed of two parts, namely the precipitated oil participating in lubrication as a flow layer and the lubricating grease fibers forming a deposition film on the surface of the contact pair under the action of pressure. When the lubricating oil is heated and oxidized and evaporated, the thickness of the oil film decreases sharply, the deposition film is damaged, and the rolling bearing fails. How to improve the serious oil-starved state is an important problem to be solved in the centralized lubrication system.

[0005] In addition, the existing lubrication technology also has the following problems: the timing of injecting lubricating grease cannot be quantitatively evaluated, the grease supply is simply based on experience and the amount of grease supply has no basis, resulting in low grease supply efficiency; the local temperature rises during the injection of lubricating grease, heat is generated quickly, and an optimization scheme needs to be used for supply; due to the fact that the centralized lubrication system only includes a small number of sensors, the running state of the rolling bearing and the running state of the grease supply structure cannot be detected in real time, and there is a lack of fault diagnosis and detection system.

[0006] Therefore, a rolling bearing lubrication state regulation method is developed and designed to improve the poor lubrication phenomenon caused by the injection of lubricating grease in centralized lubrication, to provide a research idea for improving the running state of the rolling bearing and prolonging the service life of the rolling bearing, and to have important guiding significance for the structural design of the rolling bearing lubrication system and the lubrication scheme. SUMMARY

[0007] The purpose of the present application is to overcome the shortcomings of the prior art, develop and design a rolling bearing lubrication state regulation method, and use an alternating supply mode of lubricating grease and lubricating oil to repair the flow layer and the surface deposition film, so as to effectively improve the lubrication state of the rolling bearing.

[0008] In order to achieve the above-mentioned purpose, the specific process of the rolling bearing lubrication state regulation method according to the present application is as follows: the lubrication state of the rolling bearing during operation, such as noise, vibration, temperature rise, torque and the like, is monitored in real time, the monitoring results and the lubrication failure mode are used to supplement the lubricant in real time, and when supplementing, lubricating grease and lubricating oil are supplied alternately to repair the lubricating deposition film and the lubricating oil consumed in the lubrication process, so that the rolling bearing is in an effective lubrication state for a long time, and abnormal shutdown is avoided;

[0009] At the same time, according to the monitoring results, the service life of the rolling bearing can be effectively estimated;

[0010] During operation, a large amount of lubricating grease is accumulated on both sides of the track, and the lubricating grease is a non-Newtonian fluid; when the lubricating oil is replenished, the lubricating oil inside the track is hindered by the lubricating grease on both sides of the track, and always flows back inside the track, which is beneficial to alleviate the oil starvation phenomenon.

[0011] The lubrication state regulation method for rolling bearings relates to a lubrication alternating supply control device, and the main structure of the lubrication alternating supply control device comprises a lubricating grease supply unit, a lubricating oil supply unit and a sensor unit connected with a bearing tester respectively, and a centralized processing unit for controlling the lubricating grease supply unit, the lubricating oil supply unit and the sensor unit.

[0012] The lubrication state regulation method for rolling bearings is matched with a ball-disc point contact tester, and after the sensor unit detects the occurrence of the grease lubrication oil starvation stage, the lubricating oil and the lubricating grease are replenished according to the oil supply and grease supply parameters provided by the contact oil film thickness measuring instrument; under the action of the shear stress generated by the lubricating grease on the contact pair, the thickener particles adhere to the track repair deposition film, the lubricating oil is continuously lubricated, the grease lubrication state is improved, and reference is provided for actual engineering.

[0013] The lubrication state regulation method for rolling bearings can be applied to the field of grease transportation.

[0014] Firstly, a lubricating grease and lubricating oil supply channel is designed;

[0015] Then, a detection module is arranged at the lubrication point to detect the flow process of the lubricating grease and the lubricating oil in real time;

[0016] Finally, an oil detection and alarm device is additionally arranged to prewarn problems such as lubricant supply abnormality or insufficient oil in the oil tank, and a data atlas is established according to the prewarning condition.

[0017] Compared with the prior art, the lubrication state regulation method for rolling bearings is based on the film forming mechanism and evolution and recession process analysis of the lubricating grease, and the lubricating grease and the lubricating oil are alternately supplied for centralized lubrication; the lubricating grease or the lubricating oil is accurately, timely and efficiently supplemented according to the monitoring result of the rolling bearing, so that the lubrication problems of the rolling bearing such as heat generation, aging and seal damage are effectively improved, the supply amount of the lubricating grease is reduced, the service life of the rolling bearing is prolonged, the operation condition of the rolling bearing is optimized, and different additive lubricating oils can be supplemented according to the operation condition of the rolling bearing; the operation process is simple, the principle is scientific and reliable, and verification shows that the lubricant can be kept in a long-term supply and loss balance state inside the track. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The main structure principle schematic diagram of the lubrication alternating supply control device is related to the embodiment 1 of the present application.

[0019] Figure 2 The oil lubrication result involved in the embodiment 1 of the present application.

[0020] Figure 3 The application principle involved in the embodiment 3 of the present application. DETAILED DESCRIPTION

[0021] The present application will be further described below by embodiments and in conjunction with the drawings.

[0022] Embodiment 1

[0023] The lubrication state regulating method of the rolling bearing involved in the present embodiment is to accurately quantitatively supply lubricating grease and lubricating oil alternately according to the actual operation condition of the rolling bearing, so as to effectively prolong the service life of the rolling bearing and achieve the purpose of lubrication efficiency. Figure 1 The main structure of the lubricating grease supply unit includes a grease supply end motor 12, a grease supply end plunger pump 13, a lubricating grease storage tank 14 and a grease supply end steering valve 15 arranged on a grease supply pipeline 11. The main structure of the lubricating oil supply unit includes an oil supply end motor 22, an oil supply end plunger pump 23, a lubricating oil storage tank 24 and an oil supply end steering valve 25 arranged on an oil supply pipeline 21. The main structure of the sensor unit includes a sensor group 32 connected with a controller 31, which includes but is not limited to a vibration sensor 33, a temperature sensor 34, a torque sensor 35 and a noise sensor 36. The lubricating grease supply unit, the lubricating oil supply unit and the sensor unit are respectively connected with a control center 40 and are uniformly controlled by the control center 40.

[0024] In the implementation, the lubricating alternating supply control device is matched with a ball-disc tester, and the optimal supply parameters are obtained through the test results, and then a full bearing test is carried out for verification.

[0025] When the sensor group 32 monitors that the lubrication state is in severe oil shortage, the controller 31 transmits to the control center 40, and the control center 40 controls the lubricating oil supply unit to fill the lubricating track with a set amount of lubricating oil for multiple times, and the result is shown in Figure 2 The oil film thickness no longer decays, reaches the supply-loss balance state, increases the backfill efficiency of the lubricating track, and improves the lubrication state.

[0026] The principle is that when the lubrication state is in moderate or severe oil shortage, appropriate supplement of lubricating grease can relieve the oil shortage and improve the lubrication state. However, excessive increase of the supply amount and frequency of the lubricating grease will accelerate the aging of the lubricating grease and cause the failure of the rolling bearing.

[0027] In this embodiment, the control center 40 integrates previous test data to form a database, which can determine the lubrication status and predict the service life of the rolling bearing. When the sensor group 32 of the bearing 50 is found to be abnormal or a high threshold is detected, the monitoring signal is transmitted to the control center 40 via the controller 31. The abnormal data is compared with the abnormal data in the database to analyze the cause of the abnormality. If the temperature rise is caused by insufficient lubrication, the control center 40 controls the grease supply motor 12 or the oil supply motor 22 to drive the grease supply plunger pump 13 or the oil supply plunger pump 23 to inject the grease or lubricating oil in the grease storage tank 14 or the lubricating oil storage tank 24 into the bearing 50 through the one-way control valve 10 and the grease supply diversion valve 15 or the oil supply diversion valve 25. The changes in the abnormal data are observed in real time, and the operating status of the bearing 50 is monitored and adjusted in real time with positive and negative feedback.

[0028] Example 2:

[0029] This embodiment relates to a method for regulating the lubrication state of a rolling bearing. When implemented under full bearing lubrication conditions, a control module and an alarm module are added to the lubrication alternating supply control device based on the rolling bearing's motion characteristics. During operation, the changes in noise, vibration, torque, and temperature rise of the rolling bearing are monitored in real time. Based on the real-time monitoring results, when abnormal fluctuation signals occur, such as a continuous increase in temperature or increased noise, lubricating oil is added to the lubrication track in a timely manner. According to empirical formulas, after the rolling bearing has been running for a certain period of time, an appropriate amount of lubricating oil is injected into the rolling bearing. After another period of time, grease is added to repair the deposited film in the lubrication track, thus achieving real-time replenishment of lubricating oil and grease.

[0030] This embodiment uses a separate arrangement of grease and lubricating oil to supply lubricant, achieving efficient and precise supply at fixed times and in fixed quantities, maximizing the operating accuracy of the rolling bearing and extending its service life.

[0031] Example 3:

[0032] In practical applications of the rolling bearing lubrication condition control method described in this embodiment, such as... Figure 3 As shown, by combining multiple detection feedback systems, dynamic response ranges for various signals are established. For example, when the temperature reaches a relatively high T... o At the same time, the cooling circulation system increases circulation efficiency and supplies a small amount of lubricating oil. Based on the operating status, the oil injection parameters are adjusted in a timely manner. When the temperature drops to T1, it maintains normal working conditions and achieves precise lubrication. At the same time, it can monitor the supply flow and remaining mass in real time and issue early warnings.

[0033] Its operating process is as follows:

[0034] 1. Collecting data of the existing centralized grease supply system under working condition, including running data of rolling bearing, grease supply period and grease supply amount, forming a database, and evaluating quantitative relationship between rolling bearing running state and grease supply parameter;

[0035] 2. Importing the database into control center 40, and dividing the grease supply period into two modes:

[0036] 1. When abnormality of noise, vibration, torque and temperature rise is monitored, injecting a certain amount of lubricating oil or grease into the rolling bearing according to the monitoring result;

[0037] 2. According to the period of oil injection or grease injection calculated by the database, supplying lubricating oil before the oil starvation state occurs, and reducing the risk of rolling bearing failure due to lubrication problem as much as possible;

[0038] 3. Collecting grease at the outlet of bearing box for sample analysis, estimating the degree of performance degradation of the grease according to the changes of appearance color and physicochemical properties of the grease, and supplying various additives of lubricating oil to supplement the additives lost due to high temperature, so as to ensure lubrication.

Claims

1. A method for regulating the lubrication state of a rolling bearing, the specific process of which involves: real-time monitoring of the lubrication state of the rolling bearing during operation, and real-time replenishment of lubricant based on the monitoring results and lubrication failure modes, characterized in that... During replenishment, grease and lubricating oil are supplied alternately to repair the lubricating film and lubricating oil consumed during the lubrication process. This is implemented based on a lubrication alternating supply control device. The main structure of the lubrication alternating supply control device includes a grease supply unit, a lubricating oil supply unit, and a sensor unit, all connected to the bearing testing machine, as well as a centralized processing unit that controls these units. The main structure of the grease supply unit includes a grease-end motor, a grease-end plunger pump, a grease storage tank, and a grease-end directional valve installed on the grease supply pipeline. The main structure of the lubricating oil supply unit includes an oil-end motor, an oil-end plunger pump, a lubricating oil storage tank, and an oil-end directional valve installed on the oil supply pipeline. The main structure of the sensor unit includes a sensor group connected to the controller, which includes a vibration sensor, a temperature sensor, a torque sensor, and a noise sensor. The grease supply unit, lubricating oil supply unit, and sensor unit are all connected to and controlled by the control center, which integrates previous testing data. The data forms a database to determine the lubrication status and predict the service life of rolling bearings. When an abnormal signal is detected in the bearing's sensor group, the monitoring signal is transmitted to the control center via the controller. It is compared with the abnormal data in the database to analyze the cause of the abnormality. The grease supply motor or oil supply motor drives the grease supply plunger pump or oil supply plunger pump to inject grease or oil from the grease storage tank or oil storage tank into the bearing through the one-way control valve and the grease supply diversion valve or oil supply diversion valve. The changes in abnormal data are observed in real time, and the bearing's operating status is monitored and positive and negative feedback is adjusted in real time. In practice, the lubrication alternating supply control device is matched with the ball-plate contact testing machine. After the sensor unit detects the grease lubrication shortage stage, the lubricating oil and grease are replenished according to the grease and oil supply parameters provided by the contact oil film thickness measuring instrument. Under the action of the shear stress generated by the contact pair, the thickener particles of the grease adhere to the track repair deposition film, and the replenished lubricating oil provides continuous lubrication and improves the grease lubrication status.

2. The method for regulating the lubrication state of a rolling bearing according to claim 1, characterized in that, Based on the monitoring results, the service life of rolling bearings can be estimated.

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