How to install wind turbine slewing bearing? Briefly describe its installation points and precautions

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In recent years, clean energy represented by wind power has developed rapidly in my country, which has played a positive role in relieving energy pressure and environmental pressure. Wind power generation equipment generally has a long working time and harsh operating environment, so the performance requirements of its own bearing are relatively high; slewing bearing is one of the main components of wind power generation equipment, and it is a large bearing with a special structure that can withstand comprehensive load capacity; So, how to install the wind turbine slewing bearing? What are the points and precautions? Next, the editor of Hengguan will introduce it to you.

RE Series Crossed roller Slewing bearing
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1. Installation points of wind turbine slewing bearing
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1. Do a good job of inspection before installation
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Check the installation surface of the host, pay attention to the strength of the supporting surface, the connection surface should be machined, and the surface should be flat. If the required flatness cannot be achieved by machining, it can be filled with materials with greater strength, such as special plastics, according to relevant standards.
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2. Pay attention to the load of the quenched soft zone of the bearing ring
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The “S” mark on the end face of the ferrule is the quenched soft belt area of ​​the wind turbine slewing bearing. When installing, pay attention to the position of the soft belt in the non-load area or the non-regular load area (the plug hole is always located at the soft belt).
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3. Radial positioning and preload
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The wind turbine slewing bearing should be radially positioned during installation, cross-tighten the installation bolts, and check the rotation; when tightening the bolts, ensure sufficient pre-tightening force, generally 70% of the upper yield limit of the bolt material; spring washers should not be used for installation bolts. Quenched and tempered flat washers should be used.
Slewing bearing
2. Precautions for the installation of wind turbine slewing bearings
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1. The smoothness and precision of the bearing mounting surface should comply with relevant regulations.
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2. After the slewing bearing is unpacked, each joint surface should be cleaned to remove metal chips, paint, rust inhibitor, etc.
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3. Clean the mating part of the installation plane, and pay attention to check whether the seal is still in the correct position.
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4. In order to avoid the deformation of the inner and outer rings of the bearing, it is strictly forbidden to weld the slewing bearing, otherwise it may be unusable.
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5. The installation plane should be considered to have convex and concave shoulders or positioning blocks for radial positioning.
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6. A little grease should be applied to the raceways and gears to make the installation easier; after installation, the seals must be compacted and flat to avoid grease leakage and grease leakage.
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How to install the wind turbine slewing bearing? The above is the editor’s specific explanation for its installation points and precautions, I hope it will be helpful to your construction work. In order for the bearing to work with high energy efficiency for a long time, it is necessary to achieve accurate matching, up-to-standard installation, and timely maintenance. If you have any other questions or needs, please feel free to leave a message or contact us by phone!

Reasons and treatment methods for oil leakage of slewing bearing

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Slewing bearings are used in many large-scale mechanical equipment. With the continuous increase of operating time, some faults will inevitably occur in the bearing. For example, the leakage of lubricating oil is one of the common problems. Many friends reported that after the oil leakage of the slewing bearing, the grease remaining on the bearing surface will adhere to a lot of dirt, which is easy to cause corrosion to the bearing, which makes them very distressed and do not know how to deal with it. In order to solve everyone’s confusion, Hengguan Xiaobian will take you through this article to take you to understand the causes and treatment methods of oil leakage of slewing bearings.
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1. Reasons for oil leakage of slewing bearing
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1. Frequent filling of lubricating grease or thinning of grease
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The more lubricating oil is filled, the better. The oil filling period of the slewing bearing is generally between 150 and 250 hours. The specific adjustment can be made according to the operating conditions. However, if the filling is too frequent, it will cause grease leakage; The hydraulic oil or gear oil escapes into the cavity of the rotating ring gear, which will dilute the lubricating oil and cause oil leakage.
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2. Incorrect selection of grease
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Bearings and transmissions have suitable grease types. If unsuitable lubricating oil is added, the grease may become thin due to high temperature during operation, and the thin grease will be affected by the driving gear of the rotary motor. Push down to the upper section of the inner gear ring, and then flow into the bearing cavity through the inner oil seal, and leak from the outer oil seal.
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3. Defective or loose outer oil seal
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If the rotary oil seal is defective, it will cause partial or partial leakage of grease; in addition, the loose oil seal will also cause oil leakage, which can be observed when the equipment is running. If the oil seal and the equipment rotate at the same time, it means that the existing oil seal is in the sealing groove. It has been loose and needs to be replaced in time (be sure to pay attention to safety during inspection).
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4. The inner oil seal is damaged or the bearing clearance becomes larger
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The damage of the inner oil seal is one of the reasons for the oil leakage of the slewing bearing. You can open the lubricating grease inspection cover of the slewing ring gear to see if there are broken pieces of the oil seal; in addition, if the bearing clearance becomes larger, the grease will be easily squeezed out during operation. In this case, it is usually accompanied by abnormal noise or shaking of the rotating equipment.
Slewing ring
2. Treatment method for oil leakage of slewing bearing
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1. If the seal is aged or damaged, it is necessary to disassemble the old part and clean the sealing groove, and then insert the new seal into the sealing groove completely.
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2. If the leakage of the rotary motor causes the dilution or deterioration of the lubricating oil, the rotary motor must be repaired and the grease of the entire rotary gear ring must be replaced.
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3. In case of leakage caused by improper selection of grease, all the grease in the rotary gear ring should be replaced, and the same grease should also be used in the bearing cavity.
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4. According to the operating conditions of the equipment, reasonably control the oil filling cycle to avoid excessive filling.
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5. If the slewing bearing is damaged and cannot be repaired, it must be replaced with a new slewing bearing.

Excavator slewing bearing replacement method and precautions

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Slewing bearings are widely used in many large construction machinery and equipment, such as our common excavators are one of them. Due to the large workload and complex working environment of the excavator, bearing damage will inevitably occur after long-term operation. The damage of the slewing bearing is generally manifested as abnormal noise, enlarged gap, oil leakage at the sealing device, etc. If the bearing is indeed damaged after investigation, it needs to be replaced in time. Next, the editor of Hengguan will introduce the replacement method and precautions of the excavator slewing bearing.
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1. Replacement method of excavator slewing bearing
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1. Disassembly method of old slewing bearing
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Connect the outer and inner races of the slewing bearing with the boarding and alighting, respectively, remove all the oil pipes on the slewing motor, and seal the head of the oil pipes with a clean plastic bag. Lift the upper vehicle with a crane, loosen and remove the outer ring bolts of the slewing bearing, and separate the upper vehicle from the lower vehicle.
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2. Assembly method of slewing bearing
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Clean the inner and outer races (including raceways), spacer sleeves, steel balls and bolt holes of the slewing bearing, and place the outer race on the inner race so that the raceways of the inner and outer races are on the same plane Put the steel ball and the spacer sleeve into the raceway through the radial hole, plug the block and install the taper pin firmly; when assembling the sealing device, pay attention to apply sealant to the part in contact with the sealing groove, and rotate The slewing bearing ensures flexible operation; add butter to make the raceway full of butter, and the oil pool of the slewing pinion and the large ring gear of the slewing bearing also needs to be filled with butter.
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3. Slewing bearing installation method
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Lift the upper car of the excavator with a crane. After the lower end of the slewing platform is aligned with the outer race of the slewing bearing, use tools such as round steel to align the upper and lower cars; assemble the bolts, and the bolts are installed in a triangular symmetrical manner , apply anti-loosening glue on the threads; at the beginning, the bolts cannot be tightened. After all the bolts are installed, use the torque wrench to tighten the bolts one by one; after the installation is completed, start the machine and make it rotate and other actions to check whether there is any abnormality.

Slewing ring
2. Precautions for replacement of excavator slewing bearing
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1. Choose a suitable site: When replacing the slewing bearing, choose a site with a large space and a flat ground to facilitate the separation and hoisting of the upper and lower parts.
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2. Careful hoisting: Whether it is to remove or install the bearing, the wire rope for hoisting needs to be hung well to ensure safe hoisting operation.
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3. Tighten the screws and lubricate them in place: when the slewing bearing is replaced, the screws should also be replaced to prevent dark damage, and the replaced screws should be tightened; apply enough lubricating oil to reduce the internal friction of the bearing.
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The above is the replacement method and precautions of the excavator slewing bearing summarized by the editor. I hope it will help you. During the daily maintenance and maintenance of the excavator, the operation of the slewing bearing should be checked, and the abnormality should be dealt with in time. This extends bearing life and saves your operating costs. If you have other questions or needs, feel free to leave a message or contact us by phone!

How to disassemble the large slewing bearing? Four ways to teach you

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Slewing bearing is a kind of large bearing with special structure. It can bear large axial load, radial load and overturning moment and other comprehensive loads at the same time. It is widely used in various industries or equipment. Many friends are not very familiar with how to disassemble large slewing bearings. Next, the editor of Hengguan will introduce the four commonly used bearing disassembly methods for you.


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1. Knock Disassembly Method
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The knocking method is used in many disassembly scenarios. In simple terms, a copper rod or other soft metal material smaller than the inner diameter of the bearing is used to press against the shaft end (if the bearing is located at the end of the shaft), and a hand hammer is used to strike the inside of the bearing evenly and forcefully. The ring slowly dislodges the bearing. This method is simple and easy to implement, but the disadvantage is that it is easy to cause damage to the bearing, so be careful when operating, and pay attention that the impact point of the knock should not fall on the rolling body and cage of the bearing.
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2. Pull out disassembly method
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This method requires the help of a special puller, and the tool can be pulled evenly by rotating the handle to pull out the bearing. This method has better protection for the bearing, and the following points need to be paid attention to during operation:
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1. The hook of the puller should be hooked to the inner ring of the bearing. If it is hooked on the outer ring by mistake, it may cause excessive loosening or damage to the bearing.
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2. To align the screw rod with the center hole of the shaft, pay close attention to the force of the bearing during the pull-out process to avoid damage to the hook and bearing.
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3. Pay attention to prevent the hook from slipping off, and the angle of the two feet of the puller should be less than 90°
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3. Pushing and disassembling method
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This method requires the use of a press to push the bearing, the working process is stable and reliable, and generally does not damage the machine and the bearing. Note that the force point of the press should be on the center of the shaft and cannot be biased. Common presses are manual, mechanical or hydraulic.
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4. Heat treatment disassembly method
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The bearings used for disassembly of the tight fit can be heat-treated first, and then pulled out with the help of a puller. Generally, the oil heated to about 100 ℃ is poured on the bearing to be disassembled. After the bearing ring is heated and expanded, the bearing is pulled out evenly with the help of a special puller. When disassembling this method, self-protection and oil recovery should be done to prevent burns; the shaft body should be wrapped before heating to prevent the bearing from being disassembled due to thermal expansion of the shaft body.
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The above is the specific introduction of how to disassemble the large slewing bearing, I hope it can help you. Luoyang Hengguan Bearing Technology Co., Ltd. is a comprehensive entity enterprise integrating design, research and development, production, sales and service. The product quality is guaranteed. If you have other questions about bearings, you can give us We leave a message or call us, we will serve you wholeheartedly!
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