Composition and Selection of Wind Turbine Slewing Bearing

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Wind turbine slewing bearing is one of the important parts of the wind turbine. Wind turbine converts wind energy into mechanical energy by absorbing wind energy and then converts it into electric energy to realize wind power generation. Wind power system mainly includes main rotating system, pitch system, and yaw system. The components of each system basically contain slewing bearings, such as pitch slewing bearing, yaw slewing bearing, and the quality of wind power slewing bearings directly determines whether the wind power system can operate normally.

Excavator Slewing Bearing

1. Wind turbine slewing bearing composition

Wind power slewing bearing is a large slewing bearing, which consists of four parts: inner ring, outer ring, rolling element and isolation block. Different from ordinary slewing bearing, wind turbine slewing bearing needs to withstand greater torque, so each component should also be reinforced and processed so that they can meet the needs of the wind power system. After all, the cost of wind power generation is inherently high, and once replaced or repaired, it will cause great losses.

2. The characteristics of wind turbine slewing bearing

Usually, the use environment of wind turbine slewing bearing is bad, so the better structures and components are needed. therefore, the structure and component quality of wind power slewing bearings are good. But there will be damage inevitably. Once the slewing bearing is damaged, the replacement is not only costly but also delays power generation. Wind power generation is a continuous process, that is why wind power generation requires a high-life slewing bearing. Another major feature of wind turbine slewing bearings is high life.

3. The selection of wind turbine slewing bearing

There are many types of slewing bearings, such as double row ball slewing bearings, single row cross roller slewing bearings, three rows roller slewing bearings and ball and roller combined slewing bearings, etc. The selection of wind power slewing bearings is mainly three-row roller slewing bearing and cross roller slewing bearing, these two types slewing bearings have the high bearing capacity and can better meet the needs of wind power fermentation.

4. Wind power slewing bearing manufacturers

Since wind power slewing bearings are so important, we must pay more attention to the selection of wind power slewing bearing manufacturers. We must pay attention not only to the price but also to the manufacturer’s production qualifications. Is there any qualification and experience in producing wind turbine slewing bearings? How about the slewing bearing quality, etc. in order to ensure that the wind turbine slewing bearing can run for a long time.

In general, wind turbine slewing bearing is important components of wind power equipment, such as pitch bearings and yaw bearings. Wind turbine slewing bearing is generally used in harsh environments, so wind turbine slewing bearings are required to have better performance and longer life. The life expectancy is more important to choose a suitable manufacturer to make the wind turbine slewing bearing run for a long time.

How to deal with the abnormal sound of the crane slewing bearing?

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The crane belongs to a large hoisting machine. When the crane rotates the U-turn, the key bearing function is the slewing bearing. When the crane rotates, it bears a large steering force and load, and still can provide stable rotation. However, in daily use, sometimes there is abnormal noise or stuttering. What are the reasons for these phenomena? How can we handle it effectively?

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1.The reason of the abnormal sound of the crane slewing bearing.

1. Insufficient lubricating oil
Lubricating oil plays an important role in the rotation of the slewing bearing. Because the steering force is too large when the crane rotates, it is necessary to have lubricating oil for timely lubrication. If the lubricating oil is insufficient, it will cause a stuttering when rotating, and it will also make an abnormal sound.

2.Loose bolts
Loose bolts are also a major reason of the abnormal sound of the crane slewing bearing. Bolts are used to fix the components of the slewing bearing. Loose bolts will naturally cause abnormal sounds in the slewing bearing, and even damage the bearing and the machine. It is not simple problem of abnormal noise.

3. Track wear
The slewing bearing has a matching rotating track, and the track appears worn, which naturally causes abnormal sound of the slewing bearing of the crane.

4.The slewing bearing damage
Damage to the slewing bearing is a serious reason of abnormal noise. If the slewing bearing is damaged, it needs to be replaced or repaired in time, otherwise it will delay the construction progress.

5.Non-standard use
Due to overload or irregular use, the slewing motor is damaged or the rotating gearbox is damaged, resulting in abnormal noise in the slewing bearing.

2. The solution of the abnormal sound of the crane slewing bearing

1. Lubricating oil and non-standard use can be avoided in normal use and maintenance. Therefore, one of the first tasks to solve abnormal noise is to pay attention to the usual maintenance. When the lubricating oil is insufficient, add lubricating oil in time. The machine should be operated in accordance with the process specification to avoid delays due to low-level operation errors.

2. For the problem of loose bolts, it is necessary to strengthen the bolts in time. The problem of loose bolts is a relatively simple problem.

3. It is more troublesome to deal with the problem of track wear and damage of the slewing bearing. The principle of handling is to change a new one and not to use damaged bearings to avoid irreparable damage. For the slewing bearing, the slewing bearing can be repaired, or the new slewing bearing should be replaced in time.

In addition to daily maintenance and replacement of the slewing bearing, choose the appropriate model when selecting the slewing bearing, after all, the crane is not a small machine.

Successful Installation of Slewing Bearing for Shield Machine

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Recently, our company (Luoyang Hengguan Bearing) has successfully delivered the slewing bearing of the shield screw conveyor manufactured for Fuzhou Metro Construction Co., Ltd. The slewing bearing on the equipment is imported products with long production and long transportation time and high price. The construction time is limited. After many times of communication between the customer and us, in the end, the products are produced by our company and manufactured according to the slewing bearing physical drawing paper.

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In the early stage, our technicians went into the subway construction site and determined the product quality and accuracy requirements through detailed communication with the construction party on the product operating conditions, the performance of the main engine (screw conveyor) and the situation during operation. The product is installed vertically and is tilted during use. Because the screw is driven to transport the materials such as muck and gravel, and at the same time it need support the weight of the screw, it must withstand large radial force and overturn moment during work. The teeth of the outer ring of the slewing ring, as the transmission component, need to drive the screw with the materials such as muck and gravel at the same time.

Therefore, the tooth portion of the slewing bearing is subjected to a large driving force. It is very troublesome to disassemble the screw conveyor after entering the tunnel. Therefore, during the subway excavation process, the shield screw conveyor can not cause any errors.

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In order to ensure the wear resistance and smooth running of the tooth part, the tooth part is specially quenched, the tooth surface and the tooth root hardness are improved, and the tooth grinding process is performed at the same time to improve the tooth precision and the surface finish. Because the product is used vertically, in order to ensure that the rolling body can rotate evenly during the rotation process, the overall material cage is used to ensure the flexibility and stability of the rotation. This product belongs to high-precision single row cross roller slewing bearing, outer diameter 1306mm, model D1797/954.

Our company adopts 42CrMo material and the material has been quenched and tempered to improve material performance. In the processing, each process is strictly controlled, and the measuring tools are inspected to ensure the rigor of the process and the accuracy of the dimensions, lay a good foundation for the subsequent processes, and make a record at the same time, and finally completed successfully.

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In the finished product inspection, the bearing rotation is flexible, the inner and outer diameter dimensional tolerance is controlled within 0.08mm, the clearance is controlled within 0.09mm, the radial runout is controlled within 0.09mm, the end face of beating is controlled within 0.06mm, and the overall precision reaches P5. At present, the customer of this product has been installed and debugged successfully, and has achieved the same use of the original, and has been praised and praised by customers.

What are the Models and Characteristics of Cross Roller Slewing Bearings?

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Cross roller slewing bearing also known as cross roller slewing ring bearing, is mainly divided into 11 series, HJ series and 797 series slewing bearings. Compared with other slewing bearings, cross roller slewing bearing has small size, high precision grade, high rigidity and large load bearing capacity. Resistance to damage and other characteristics. It is often used in large-scale rotary devices such as bucket turbines, overweight transportation machinery, port machinery, mining machinery, park amusement machines, filling machines, construction machinery and missile launchers, which plays an important role in the rotary rotation of construction machinery products.

Single Row Cross Roller Slewing Bearing (11 series)

1. Cross roller slewing bearing model

Cross Roller Slewing Bearing 11 Seri00es
Cross Roller Slewing Bearing HJ Series
Cross roller slewing bearing 797 internal gear series
Cross roller slewing bearing 797 external gear series
Cross roller slewing bearing 797 non-gear series

Different cross roller slewing bearings are available in various types to meet different mechanical requirements. Hengguan bearing manufacturers can design according to customer’s specific requirements, manufacture and install according to actual conditions, focusing on customer needs.

2.The characteristics of the cross roller slewing bearing

The cross roller slewing bearing can be assembled in all directions of the main shaft, which is very convenient to use and can bear radial and axial loads at the same time, which simplifies the structure of the machine and reduces the weight of the mechanism. Cross roller slewing bearings have low grease consumption due to their high rotation efficiency and low heat dissipation. Moreover, it can achieve negative clearance, has extremely high rotation precision and high rigidity, and is 3-4 times stronger than conventional bearings. The bearing capacity of the crossed roller slewing bearing is also high, and the roller and the raceway are in line contact, withstand higher loads.

3.The installation of the cross roller slewing bearing

For cross roller slewing bearing, firstly, the roller and spacer block must be correctly placed, then install the screws or bolts, and then adjust the no-load slewing resistance torque after the installation. The next step is to correctly place the inner circumference and the outer periphery. Place it on the workbench, place it in the lower half of the inner circumference and try to make the outer raceway correspond to the inner circumference channel. Fill the gap with the spacer block. The number of rollers and spacers is generally equal, and the rollers and spacers should be close to each other. If there is a gap between the rollers and the spacers, the thickness of one or two spacers can be adjusted to compensate for the gaps. The grease gently and evenly on the raceway. The installation process is an important process. Try to ask a professional to install it to avoid problems with the bearings.

The above is the analysis of the model and characteristics of the cross roller slewing bearing. The cross roller slewing bearing has higher adaptability, higher precision grade, high rigidity, large load bearing capacity and strong resistance to damage than ordinary bearings. Therefore, the direction of use is also for large-scale mechanical equipment, such as overweight transportation machinery, port machinery, mining machinery, park amusement machines, filling machines, construction machinery and missile launchers.