Inspection and troubleshooting of bearings of ZYB booster fuel pump in operation

Inspection and troubleshooting during the operation of the bearing of ZYB booster fuel pump I rolling sound of the bearing ZYB booster fuel pump uses a sound detector to check the rolling sound size and sound quality of the bearing in operation Even if the bearing is slightly peeled and damaged, it will emit abnormal sound and irregular sound, which can be distinguished by the acoustic detector of potenborn 2 Bearing vibration Bearing vibration is very sensitive to bearing damage, such as peeling, indentation, rust, crack, wear, etc., which will be reflected in bearing vibration measurement Therefore, the vibration can be measured by using a special bearing vibration measuring device (frequency analyzer, etc.), and the specific abnormal situation can not be inferred by frequency division The measured values are different due to the service conditions of the bearing or the installation position of the sensor, so it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard 3 Temperature of bearing: generally, the temperature outside the bearing chamber can be inferred If the temperature of the outer ring of the bearing can be directly measured by using the oil hole, it is more appropriate Generally, the temperature of the bearing rises slowly with the operation, and reaches a stable state after 1-2 hours The normal temperature of the bearing varies with the heat capacity, heat dissipation, speed and load of the machine If the lubrication and installation parts are suitable, the bearing temperature will rise sharply, and abnormal high temperature will occur At this time, the operation must be stopped, and the ZYB booster fuel pump shall take necessary precautions According to a large number of test data, the average value of the outer ring temperature of the bearing in various machines for reference As the temperature is affected by lubrication, speed, load and environment, it only represents the approximate temperature range The working temperature of the bearing can be monitored at any time by using the thermal sensor, and when the temperature exceeds the specified value, it can automatically alarm the user or stop to prevent the shaft burning accident 4 Lubrication (1) the function of bearing lubrication lubrication has an important influence on the fatigue life, friction, wear, temperature rise, vibration and so on of rolling bearing Without normal lubrication, the bearing cannot work Analysis of the causes of bearing damage shows that about 40% of bearing damage is related to poor lubrication Therefore, the good lubrication of the bearing is an effective measure to reduce the friction and wear of the bearing In addition, the lubrication of bearings has many functions, such as heat dissipation, rust prevention, sealing and impact mitigation The functions of bearing lubrication can be briefly described as follows: A forming an oil film between two rolling surfaces or sliding surfaces in contact with each other to separate the two surfaces, so as to reduce friction and wear on the contact surface B when using oil lubrication, especially circulating oil lubrication, oil mist lubrication and oil spray lubrication, the lubricating oil can take most of the friction heat inside the bearing and play an effective role in heat dissipation C when grease lubrication is used, it can prevent external dust and other foreign matters from entering the bearing and play a sealing role D lubricants can prevent metal corrosion E extend bearing fatigue life (2) comparison between grease lubrication and oil lubrication the lubrication methods of bearings are roughly divided into grease lubrication and oil lubrication In order to give full play to the function of the bearing, it is important to use the lubrication method according to the use adjustment and use purpose (3) grease lubricating grease is a lubricant composed of base oil, thickener and additive When selecting, it is necessary to select lubricating grease that is very suitable for the service conditions of bearings Due to different trademarks, the performance of ZYB booster fuel pump will also be very different, so attention must be paid when selecting The commonly used lubricating grease for bearings are calcium base grease, sodium base grease, calcium sodium base grease, lithium base grease, aluminum base grease and molybdenum disulfide grease, etc The amount of grease filled in the bearing should be 1 / 2-1 / 3 of the internal space of the bearing Reduce to 1 / 3 at high speed Too much grease raises the temperature (IV) selection of lubricating grease: when selecting lubricating grease according to the working temperature, the main indexes shall be dropping point, oxidation stability and low temperature performance Dropping point can generally be used to evaluate high temperature performance, and the actual working temperature of bearing shall be 10-20 ℃ lower than dropping point The service temperature of synthetic grease shall be 20-30 ℃ lower than the dropping point When selecting the grease according to the bearing load, the grease with small penetration should be selected for the heavy load When working under high pressure, in addition to small penetration, it also has high oil film strength and extreme pressure performance When the grease is selected according to the environmental conditions, the calcium based grease is not easy to dissolve in oil, and is suitable for dry and less water environment (V) under the condition of high speed and high temperature, the ZYB booster fuel pump can use oil lubrication when the grease lubrication is not suitable Through the circulation of lubricating oil, a lot of heat can be taken away Viscosity is an important characteristic of lubricating oil The viscosity directly affects the fluidity of lubricating oil and the thickness of oil film formed between friction surfaces The viscosity of lubricating oil under the working temperature of bearing is generally 12-15 CST The higher the speed, the lower the viscosity, and the heavier the load, the higher the viscosity Commonly used lubricating oil includes mechanical oil, high-speed mechanical oil, turbine oil, compressor oil, transformer oil, cylinder oil, etc The oil lubrication method includes: a the oil bath lubrication is a general lubrication method of Zui, which is suitable for the lubrication of low and medium speed bearings A part of the bearing is immersed in the groove, and the lubricating oil is brought up by the rotating bearing parts, and then flows back to the oil surface of the groove, which should be slightly lower than the center of the Zui low rolling body B oil dripping lubrication is suitable for bearing parts requiring quantitative supply of lubricating oil The amount of oil dripping is usually one drop every 3-8 seconds Too much oil will cause the bearing temperature to increase C circulating oil lubrication: the filtered oil is delivered to the bearing parts by the oil pump, and then it is used after being filtered and cooled by the lubricating oil after the bearing Because the circulating oil can take away some heat and cool down the bearing, this method is suitable for the bearing parts with high speed D spray lubrication is used to compress the dry compressed air by spray with lubricating oil to form oil mist In the jet bearing, the airflow can effectively cool the bearing and prevent impurities from invading This method is suitable for lubrication of high speed and high temperature bearing parts E spray lubrication: use oil pump to spray high-pressure oil into the bearing through the nozzle, and the oil injected into the bearing flows into the oil groove through the other end of the bearing When the bearing rotates at a high speed, the rolling body and cage also form air flow around with a relatively high rotation speed It is difficult for ZYB booster fuel pump to send the lubricating oil to the bearing by general lubrication method At this time, the lubricating oil must be injected into the bearing by high-pressure injection method The position of the nozzle should be placed between the inner ring and the center of the cage (VI) solid lubrication Under some special conditions of use, ZYB booster fuel pump adds a small amount of solid lubricant into the lubricating grease For example, adding 3-5% molybdenum disulfide 1 can reduce wear and improve the compression and heat resistance For special conditions such as high temperature, elegance, high vacuum, corrosion resistance, radiation resistance, and extremely low temperature, adding solid lubricant into engineering plastics or powder metallurgy materials can be made into tools For the bearing parts with self-lubricating property, for example, the solid lubricant is bonded on the raceway, cage and rolling body with adhesive to form lubricating film, which has certain effect on reducing friction and wear (VII) lubricant supplement and replacement A interval between grease supplement Due to the increase of mechanical effect, aging and pollution, the lubricating base filled in the bearing configuration will gradually lose its lubricating performance Therefore, the lubrication rank needs to be continuously supplemented and updated The interval time of lubricant supplement will vary according to the formation, size and rotation speed of the bearing The approximate interval time of lubricant supplement is required according to the operation time In addition, when the bearing temperature is more than 70 ℃, the interval time of using lubricating grease will be reduced by half for every 15 ℃ rise of bearing temperature The double-sided sealed bearing has been loaded with grease during manufacturing "HRB" uses standard grease in these products The common operating temperature range and other properties are suitable for the specified occasions, and the amount of grease filling is also corresponding to the size of the bearing The service life of the grease can generally exceed the bearing life, except for special occasions, there is no need to supplement the grease B replacement cycle of lubricating oil: the replacement cycle of lubricating oil is different due to different service conditions and oil quantity Generally, when ZYB booster fuel pump is used in a good environment with less dust and operating temperature below 50 ℃, it shall be replaced once a year When the oil temperature reaches 100 ℃, it shall be replaced once every three months or less.