How to Conduct Slew bearing Diagnosis
The operating state of bearings affects the performance of equipment and production efficiency. It is crucial to select an appropriate fault diagnosis method, and the selection of the diagnosis method also needs to be considered comprehensively.
What is the feature of Slew bearings?
Slew bearings are key components in mechanical transmission and have many distinct characteristics. Structurally, rolling slew bearings generally consist of an inner ring, an outer ring, rolling elements, and a cage, with each part working in coordination; sliding slew bearings mainly include a slew bearing housing and a slew bearing bush. In terms of performance, they can effectively reduce the friction between moving parts and improve mechanical efficiency. They also have a high load – carrying capacity and can withstand radial and axial loads. Slew bearings are available in different accuracy grades to meet the diverse requirements of equipment, from common to high – precision ones. Moreover, slew bearings have good rotational stability, ensuring the stable operation of equipment, and are widely used in various mechanical fields such as automobiles, machine tools, and motors.
Determine Strategies Based on Equipment Characteristics
The fectures of the equipment itself are the fundamental basis for choosing a diagnosis method. Regarding speed and load, slew bearing failures in high – speed equipment can cause high – frequency vibrations. The vibration analysis method, with its ability to capture high – frequency signals, is an ideal choice for such equipment. For example, in a gas turbine, where the slew bearing rotates at an extremely high speed, high – sensitivity acceleration sensors installed at key positions can collect vibration signals in real – time. Through signal processing techniques such as the Fast Fourier Transform, the vibration spectrum can be analyzed to accurately identify slew bearing fault types, such as early wear of the balls and fatigue cracks in the raceways. For heavy – load equipment, like the hoist of a large – scale mining machine, which endures huge pressure for long periods, the slew bearings are prone to problems such as wear and plastic deformation due to overloading. In this case, the combined use of the temperature monitoring method and the oil analysis method can be very effective. Temperature monitoring can promptly detect slew bearing overheating caused by excessive load, while oil analysis can detect the concentration and composition of metal particles in the oil due to wear, enabling the determination of the wear degree and location of the slew bearing.
Make Choices According to the Working Environment
The working environment significantly affects the applicability of diagnosis methods. In high – temperature environments, such as the slew bearings of blast furnace fans in the metallurgical industry, the conventional oil analysis method may produce errors due to the impact of high temperature on the oil performance. In this case, the vibration analysis method and the temperature monitoring method based on infrared technology are more reliable. Infrared thermal imagers can measure the surface temperature of slew bearings from a distance and non – contact, quickly identifying areas with abnormal temperatures. In humid or corrosive environments, such as the slew bearings of chemical equipment, the slew bearings are prone to corrosion failures. Although the visual inspection method can directly observe surface corrosion signs, it is difficult to detect internal corrosion. However, the combination of the vibration analysis method and the ultrasonic testing method can effectively make up for this deficiency. Ultrasonic waves can penetrate the slew bearing material to detect internal micro – defects and the degree of corrosion.
Select Methods According to Fault Types
Different fault types require targeted diagnosis methods. For early – stage faults, the vibration analysis method and the acoustic detection method have unique advantages. Early – stage slew bearing wear, fatigue damage, and other faults can cause weak abnormal vibrations and sound signals during slew bearing operation. Through high – resolution vibration sensors and high – sensitivity acoustic sensors, combined with advanced signal processing algorithms, these subtle changes can be captured. For example, wavelet transform can be used to decompose the vibration signal to extract early – stage fault features and achieve early – warning of faults. The oil analysis method can also play a role in early – stage detection. By analyzing the number, shape, and composition of wear particles in the oil, the wear trend of the slew bearing can be detected in advance.
The diagnosis of sudden faults relies more on methods that can respond quickly. When sudden faults such as part breakage or jamming occur in a slew bearing, the vibration analysis method will detect a sharp increase in the vibration amplitude and a mutation in the frequency components. At the same time, the temperature monitoring method can also detect an instant increase in temperature. These abnormal signals can be quickly alerted through an automated monitoring system, enabling operators to take timely measures to prevent the accident from escalating.
Make Decisions by Weighing Cost – Benefit
Cost – benefit is an important factor that enterprises must consider when choosing a diagnosis method. From the perspective of initial investment, vibration analysis equipment, high – precision oil testing instruments, etc., are expensive. For small and medium – sized enterprises with limited funds or some application scenarios with low requirements for equipment accuracy, such as the ventilation equipment in small factories, it is more practical to use the cost – effective visual inspection method and simple temperature monitoring devices. Considering maintenance costs, the oil analysis method requires regular sampling, sending for inspection, and consuming chemical reagents, which can be costly in the long run; the sensors used in the vibration analysis method need to be calibrated and maintained regularly, also incurring certain costs. Therefore, enterprises need to comprehensively consider the importance of the equipment, the potential losses caused by faults, and the maintenance budget to weigh and choose a suitable diagnosis method.
Arrange Reasonably by Referring to Personnel Skills
The skill level of personnel is also a factor that cannot be ignored. Diagnosis methods such as vibration analysis and oil analysis require professional technicians to collect, analyze, and interpret data. For enterprises lacking professional talents, complex diagnosis methods may not be effectively utilized. In this case, it is more appropriate to choose simple – to – operate and easy – to – understand methods such as visual inspection and temperature monitoring. At the same time, enterprises can improve personnel skills through internal training and external further education to gradually introduce more advanced diagnosis methods.
Select Means by Matching Diagnosis Accuracy
The requirement for diagnosis accuracy determines the level of method selection. For equipment with extremely high accuracy requirements, such as aero – engines and lithography machines, a single diagnosis method is difficult to meet the needs. It is necessary to comprehensively use multiple high – precision methods. The vibration analysis method combined with the oil analysis method, supplemented by non – destructive testing techniques such as X – ray flaw detection and ultrasonic flaw detection, can comprehensively monitor the slew bearing status from multiple dimensions to ensure the safe and reliable operation of the equipment. For general industrial equipment, such as ordinary motors and reducers, under the premise of meeting basic production requirements, relatively simple diagnosis methods can be used to ensure the diagnosis effect while reducing costs.
Determine the Method by Combining Real – Time Monitoring
The need for real – time monitoring varies according to the operating characteristics of the equipment. For key equipment that operates continuously and does not allow downtime, such as the slew bearing of the reactor agitator in a large – scale petrochemical plant, real – time online monitoring methods must be adopted, such as the vibration monitoring system based on the Internet of Things and the real – time oil monitoring system, to ensure that potential fault hazards can be detected in a timely manner. For intermittent – operation equipment, such as tower cranes on construction sites, regular inspections and detections can be carried out. Visual inspections, vibration detections, and oil analyses can be performed during equipment downtime intervals to rationally allocate monitoring resources and improve monitoring efficiency.
The accessibility of the equipment also affects the implementation of the diagnosis method. For slew bearings that are easily accessible, such as the sliding slew bearings on machine tool guides, simple methods such as visual inspection and manually feeling the temperature can be directly used for daily inspections. For slew bearings installed in enclosed spaces, at heights, or in dangerous areas, such as the main pump slew bearings of nuclear power plants, non – contact and remote – operation diagnosis methods are required. For example, robots equipped with detection equipment can be used for vibration detection, and remote infrared monitoring systems can be used for temperature monitoring to ensure the safe and efficient progress of the diagnosis work.
Choosing a suitable slew bearing fault diagnosis method for a specific application is a process of comprehensively considering multiple factors. Enterprises need to weigh the pros and cons based on factors such as equipment characteristics, fault types, cost – benefit, personnel skills, diagnosis accuracy, real – time monitoring requirements, and equipment accessibility, and make scientific decisions. When necessary, a comprehensive diagnosis strategy combining multiple methods can be adopted to achieve accurate diagnosis and effective prevention of slew bearing faults, ensuring the stable operation of equipment and enhancing the production efficiency and competitiveness of enterprises.
The Price of Slew bearings
The price of slew bearings is affected by many factors. Firstly, it is the type. Deep – groove ball slew bearings have a simple structure and a large usage volume, so their prices are affordable; tapered roller slew bearings can withstand combined loads, and their manufacturing process is complex, resulting in relatively high prices. The size specification is also crucial. Large – sized slew bearings require more materials and are difficult to manufacture. For example, large – sized slew bearings used in wind power equipment are expensive; the opposite is true for small – sized slew bearings. In addition, the higher the accuracy grade, the more stringent the processing requirements, and the more expensive the price.
Supplier of Slew bearing
LDB bearing will continue to adhere to the corporate vision of “meticulous manufacturing, serving the world”, continuously increase investment in research and development, improve product quality and technical levels, expand market areas, strengthen international cooperation, and strive towards the goal of becoming a world – class slew bearing manufacturer. It is believed that with the joint efforts of all employees of LDB slew bearing, this enterprise, which carries numerous honors and dreams, will surely write an even more glorious chapter in the industrial slew bearing field and make greater contributions to the development of the global industry.
