Product Description
Production descrption:
Slewing bearing, as a key component, connects the machine structural parts, transfers loads, and allows relative rotation between them. It is widely used in excavator, cranes, mining equipment, port hoist and military, scientific
research equipment, and so on.1 Especially in the wind industry, the single-row 4 contact-point slewing bearing is adopted as the yaw bearing2 to transfer axial (Fa), radial (Fr), and tilting moment (M) loads, and the rotational
movement between generators and tower is realized.
Given the importance of the slewing bearing on the mechanical structures and the complicated working condition, it may directly affect the normal operation of equipment once a failure happens and even causes huge economic losses and casualties. Because the damage mechanism and its development situation are not clear, the range and distribution of the detecting elements are selected mainly by experience rather than by theoretical guidance. It leads to weak signals, low signal-to-noise ratio, and poor accuracy of the fault identification. Therefore, the dynamic simulation of the slewing bearing with localized defect and the exploration of dynamic response caused by the defect have important practical guiding significance for monitoring system construction on the raceway damage of the slewing bearing.
As the important components of engineering equipment, slewing bearing is widely studied by many scholars. Amasorrain et al.3 analyzed the difference between the 2 and 4 contact-point slewing bearing and gave the load distribution of a 4 contact-point slewing bearing and then got maximum load of the rolling elements. Kania4 applied the finite element method to calculate and analyze the load capacity for rolling elements of the slewing bearing and gave the load deformation of rolling elements under the working conditions.
Flasker et al.5 carried out the numerical analysis on the raceway surface crack propagation of the slewing bearing and studied the crack propagation situation and raceway contact pressure distribution when the contact angle is different. Liu6 conducted the condition monitoring experiment of the slewing bearing and the grease has been analyzed to find out the content of iron. Finally, the wear status of the internal raceway and the service life are studied according to the results of the analysis. Caesarendra et al.7 performed the accelerating life test for slewing bearing to make it damage naturally, and the extracted vibration signals are analyzed by the empirical mode decomposition (EMD) and ensemble empirical mode decomposition (EEMD) method, respectively, in order to obtain the accurate damage information of the slewing bearing. Žvokelj et al.8 collected the vibration and acoustic emission signals based on the slewing bearing condition monitoring experiments. The EEMD-multi-scale principal component analysis (MSPCA) method was applied in adaptive signal decomposition, and the fault feature components were extracted to identify local defect of the slewing bearing.
These studies mostly focus on the load distribution, condition monitoring, and signal processing rather than the raceway damage mechanism, damage development, and its impact. But if the damage mechanism is unknown, the type and range of sensors is difficult to choose; therefore, the choosing of sensors is baseless in the previous researches. In addition, the finite element dynamic simulation method has been used in the bearing research and analysis9,10 more and more widely. These references indicate that this work mainly focuses on the static analysis of the slewing bearing rather than dynamic research of the bearings. However, all of the static researches of the bearings provide a lot of help for
the next dynamic research of the bearings. For example, based on this work, Li et al.11 research the dynamic mechanical properties of single-row slewing bearing by the explicit dynamic algorithm. The distribution and variation of obtained Mises stress provide theoretical foundation for researching the bearing raceway damage.
Therefore, it is necessary to apply the dynamic simulation analysis method for slewing bearing study with the localized defects and explore the influence mechanism of the damage sizes. It is a new important research field and can provide powerful basis for online evaluation of the raceway damage.
Type 571.40.1000 slewing bearing12 was taken as the research object and the geometry sizes of damage were considered in this article. This slewing bearing can satisfactorily fulfill the requirements of the experimental verification, and the experimental verification can be easily carried out because the dimension of this slewing bearing is quite small. The defect models of different parameters were constructed to simulate the raceway spalling damage.
According to the actual working condition, the external load, rotational speed, and other constraints were imposed to the models. The explicit dynamic finite element algorithm was adopted during the simulation analysis, and the influence mechanism of the damage size was obtained by analyzing the stress distribution on the surface of the slewing bearing raceway and the vibration acceleration response around the defect.
Application photos
FAQ
1. What is the production process?
A: Production process including raw material cutting, rough turning, machining processing(layout for drilling, tooth processing), finish turning, grinding, accessories cleaning, assembling, stoving, oil coating, testing, package.
2. How to control the quality of the products?
A: High precision equipment, advanced in-house engineer team, strictly inspection as well as CHINAMFG like SGS, DNV, BV, ABS, etc.
3: How long is your delivery time?
A: Generally speaking, it is 3-5 days if the goods are in stock. 15-25 days if the goods are not in stock.
4: Do you provide samples ? is it free or not?
A: Yes, we could offer a sample free of charge but we need a basement cost.
5: What are your terms of payment?
A: 30% prepaid and balance before shipment.
For big order, we accept L/C at sight.
6. What is your MOQ?
A: For standard type and OEM, MOQ is 1 pc.
7. What is the transportation?
A: DHL, UPS, TNT, FedEx. by sea or by air
8. Can you design special packaging?
A: Yes. Except for regular packing, we can make special packing and label for the customer.
9. What’s your payment method.
A: We can accept PayPal/ West Union/Alibaba order by credit card/ Bank transfer Etc.
10. Can you provide an OEM service?
A: Yes, we provide OEM service, packing and other requirements
/* March 10, 2571 17:59:20 */!function(){function s(e,r){var a,o={};try{e&&e.split(“,”).forEach(function(e,t){e&&(a=e.match(/(.*?):(.*)$/))&&1
| Standard or Nonstandard: | Standard |
|---|---|
| Feature: | Heat-Resistant |
| Sealing Gland: | Sealed On Both Sides |
| Rolling-Element Number: | Single and Double Row |
| Roller Type: | Four Point Contract |
| Material: | 42CrMo/50mn/ S48c, Bearing Steel |
| Samples: |
US$ 50/Set
1 Set(Min.Order) | |
|---|
| Customization: |
Available
|
|
|---|
Can you provide insights into the importance of proper installation and alignment of slewing rings?
Proper installation and alignment of slewing rings are of utmost importance for ensuring optimal performance, longevity, and safety of rotating systems. Here’s a detailed explanation of the importance of proper installation and alignment of slewing rings:
- Load Distribution: Correct installation and alignment of slewing rings ensure proper load distribution across the rolling elements and raceways. When a slewing ring is improperly installed or misaligned, excessive loads may be concentrated on specific areas, leading to accelerated wear, premature failure, and reduced load-bearing capacity. Proper alignment helps distribute loads evenly, maximizing the life expectancy of the slewing ring.
- Smooth Operation: Accurate installation and alignment contribute to the smooth operation of rotating systems. Misalignment can result in increased friction, uneven motion, vibrations, and noise. These issues not only reduce efficiency but also impact the overall performance and reliability of the system. Proper alignment minimizes friction and ensures smooth and precise rotational movement, enhancing the system’s efficiency and productivity.
- Reduced Wear and Tear: Improper installation or misalignment can cause excessive wear and tear on the slewing ring and associated components. Misalignment can lead to increased rolling element and raceway stresses, resulting in accelerated fatigue and surface damage. By achieving proper alignment, the slewing ring operates within its designed parameters, reducing wear and extending its operational life.
- Optimized Performance: Proper installation and alignment directly impact the performance of rotating systems. Accurate alignment ensures that components such as gears, motors, and drive systems mesh correctly with the slewing ring. This alignment facilitates efficient power transmission, reduces energy losses, and improves the overall performance and responsiveness of the system.
- Prevention of Structural Damage: Misalignment of slewing rings can exert excessive forces on the supporting structure or adjacent components. Over time, these forces can cause structural damage, misalignment in other parts of the system, or even equipment failure. Proper installation and alignment help prevent such structural damage, ensuring the integrity and longevity of the entire system.
- Safety Considerations: Correct installation and alignment of slewing rings are crucial for safety in rotating systems. Misalignment can lead to unexpected movements, uncontrolled motion, or component failure, posing a risk to personnel, equipment, and the surrounding environment. Proper alignment reduces the likelihood of accidents, improves operational safety, and ensures compliance with safety regulations.
- Ease of Maintenance: Properly aligned slewing rings are easier to maintain and service. Routine maintenance tasks such as lubrication, inspection, and replacement of components can be performed more efficiently when the slewing ring is correctly installed and aligned. This reduces downtime, extends maintenance intervals, and improves the overall operational efficiency of the system.
In summary, proper installation and alignment of slewing rings are critical for achieving optimal performance, reliability, and safety in rotating systems. Accurate alignment ensures load distribution, smooth operation, reduced wear, optimized performance, prevention of structural damage, enhanced safety, and ease of maintenance. It is essential to follow manufacturer guidelines, industry standards, and best practices to ensure the correct installation and alignment of slewing rings, maximizing their operational lifespan and the efficiency of the entire system.
How do electronic or computer-controlled components integrate with slewing rings in modern applications?
In modern applications, electronic or computer-controlled components are often integrated with slewing rings to enhance functionality, precision, and automation. This integration allows for advanced control, monitoring, and optimization of rotating systems. Here’s a detailed explanation of how electronic or computer-controlled components integrate with slewing rings in modern applications:
- Sensor Integration: Electronic sensors can be integrated with slewing rings to provide real-time feedback and data on various parameters. For example, position sensors can be used to accurately track the position and angle of the slewing ring, enabling precise control and positioning of the rotating components. Load sensors can measure the load applied to the slewing ring, allowing for dynamic load monitoring and optimization.
- Control Systems: Computer-controlled components, such as programmable logic controllers (PLCs) or microcontrollers, can be used to manage the operation of slewing rings. These control systems can receive input from sensors and execute algorithms to control the speed, direction, and positioning of the slewing ring. By integrating electronic control systems, precise and automated control of the slewing ring can be achieved, improving efficiency and reducing human error.
- Automation and Synchronization: In modern applications, slewing rings are often integrated into automated systems where they work in synchronization with other components. Electronic or computer-controlled components can facilitate this synchronization by coordinating the movements of multiple slewing rings or integrating them with other automated processes. This integration enables seamless and optimized operation of the rotating system as a whole.
- Data Monitoring and Analysis: Electronic components can be used to collect and analyze data from slewing rings. This data can include parameters such as position, speed, temperature, and load. By monitoring and analyzing this data, it is possible to identify patterns, detect anomalies, and optimize the performance of the slewing rings. This information can be used for predictive maintenance, energy optimization, and performance improvement.
- Communication and Networking: Electronic components enable communication and networking capabilities for slewing rings. They can be connected to a network or interface with other control systems, allowing for remote monitoring, control, and integration into larger systems. This enables centralized monitoring and control of multiple rotating systems, facilitating efficient operation and maintenance.
- Feedback and Safety Systems: Electronic components can provide feedback and safety features in slewing ring applications. For example, limit switches or proximity sensors can detect the end positions of the slewing ring’s rotation and trigger safety mechanisms or control actions accordingly. This ensures safe operation, prevents over-rotation, and protects the equipment and personnel.
By integrating electronic or computer-controlled components with slewing rings, modern applications can achieve enhanced control, precision, automation, and data-driven optimization. This integration allows for efficient operation, improved safety, accurate positioning, synchronization with other systems, and the ability to adapt to changing operational requirements. It paves the way for advanced technologies such as robotics, Internet of Things (IoT), and Industry 4.0, where slewing rings play a vital role in the seamless integration of mechanical and electronic systems.
What is a slewing ring, and how is it used in mechanical systems?
A slewing ring, also known as a slewing bearing or turntable bearing, is a specialized type of rolling element bearing that enables rotational movement between two components. It consists of an inner ring, an outer ring, rolling elements (such as balls or rollers), and often a gear mechanism. Slewing rings are used in mechanical systems where there is a need for smooth and controlled rotation. Here’s a detailed explanation of what a slewing ring is and how it is used:
- Structure and Components: A slewing ring typically has a large diameter compared to its thickness, allowing it to support axial, radial, and moment loads. The inner and outer rings have raceways that the rolling elements move along. The rolling elements, which can be balls or rollers, distribute the load and facilitate smooth rotation. In some cases, a gear mechanism is integrated into the slewing ring, allowing it to act as a rotational drive system.
- Rotational Movement: The primary function of a slewing ring is to enable rotational movement between two components. It provides a stable and low-friction interface that allows one component to rotate relative to the other. The rolling elements within the raceways minimize friction and distribute the load evenly, resulting in smooth and controlled rotation. Slewing rings can support both continuous rotation and intermittent or oscillating movement, depending on the application requirements.
- Load Support: Slewing rings are designed to support various types of loads. They can handle axial loads, which are forces acting parallel to the axis of rotation, as well as radial loads, which are forces acting perpendicular to the axis of rotation. Additionally, slewing rings can accommodate moment loads, which are a combination of axial and radial loads that create bending or twisting forces. The load-carrying capacity of a slewing ring depends on factors such as its size, design, and choice of rolling elements.
- Applications: Slewing rings find applications in a wide range of mechanical systems across different industries. Some common uses include:
- Construction and Cranes: Slewing rings are extensively used in construction machinery, cranes, and mobile equipment. They enable 360-degree rotation of the boom or jib, allowing for efficient material handling and positioning.
- Wind Turbines: Slewing rings are crucial components in wind turbine systems. They support the rotor, allowing it to rotate according to wind direction, and provide a connection between the rotor and the nacelle, enabling yaw movement.
- Industrial Equipment: Slewing rings are utilized in various industrial equipment, including indexing tables, turntables, robotic arms, and packaging machinery. They facilitate precise and controlled rotation in these applications.
- Transportation and Automotive: Slewing rings are employed in transportation and automotive applications, such as vehicle cranes, aerial platforms, and rotating platforms for heavy-duty vehicles. They enable safe and smooth rotation in these specialized systems.
- Medical and Rehabilitation Equipment: Slewing rings are used in medical and rehabilitation equipment, such as patient lifts and adjustable beds. They allow for smooth and controlled movement, aiding in patient care and mobility assistance.
In summary, a slewing ring is a specialized bearing that enables controlled rotational movement between components in mechanical systems. Its ability to support various loads, provide smooth rotation, and accommodate different applications makes it a valuable component in a wide range of industries.
editor by CX 2024-02-08