What are the failures of tower crane slewing bearing?

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With the rapid development of the national economy, the construction of the project is spread over cities, roads, mountains, and rivers. As one of the important equipment for engineering construction, tower cranes play an important role. The slewing bearing, as a key component of the tower crane, directly affects the working efficiency of the tower crane. Due to the long-term load work and the working environment, there are some faults in the slewing bearing during use, which affects its normal operation. Today, Luoyang Hengguan Bearing company will explain to you the common tower crane slewing failure and its causes.

First, broken teeth

1. Broken teeth are often directly related to improper installation.
The size of the gear is not properly installed during installation. The gap does not meet the requirements, and the two teeth are not properly meshed during operation to cause broken teeth. The teeth clearance should be adjusted as required; the meshing clearance is not adjusted at the maximum position of the tooth jump as required, causing the pinion to become stuck when the meshing gear is engaged with the maximum position of the large gear toothing, causing the green tooth to be in place. The pinion gear is adjusted and then tested according to the requirements. The large and small gear axes are not parallel. After installation, the large and small gears mesh poorly, causing broken teeth. The two gears should mesh in parallel. The slewing bearing mounting bolts are not tightly fixed, causing broken teeth, the bolts should be tightened as required.
2, the operation is not standardized
Violation of the operating procedures, overload, and high-speed rotation, the host crashes into obstacles. It should be operated strictly in accordance with the operating procedures. When the slewing bearing is engaged with the pinion, foreign matter is caught. It should be ensured that the large and small gears are clean and checked frequently.

Second, the grease problem caused abnormal noise

The slewing bearing of the tower crane is lubricated with grease, and the abnormal noise is most likely caused by lubrication problems. Common causes are the lack of grease in the raceway, uneven grease filling, poor grease quality aging, and incorrect lubricant selection. To solve this problem, you only need to use the right lubricant, timely filling, and timely replacement.

Third, foreign objects in the slewing ring

When the inside of the slewing bearing has foreign matter such as sand particles or iron filings, non-periodic vibration occurs, and there is also a failure in which the rotation is inflexible. When encountering such a situation, it is necessary to strictly clean the bearings, shafts, seat holes, and matching parts before installation, and remove the foreign matter in the lubricant in time; remember to avoid the use of plastic cages with impure materials or embedded foreign objects. This will remove the corresponding abnormal noise.

Fourth, the seal is broken

Check the seal is wear or not because the structure of the slewing bearing seal plays a key role in the sealing. When the seal and the slewing ring do not fit completely, it is easy to cause grease leakage. In addition, the weathering resistance and butter resistance of the sealing strip material also issues to be considered.

Five, loose bolts

1. The mounting bolts are loose, causing shaking during work. Please inspect all inner and outer ring mounting bolts immediately and tighten them as required.
2. Check whether the operation is overloaded and operate in strict accordance with the regulations.
3. long-term overload operation, resulting in the crushing of the raceway, the gap is too large.

Sixth, the raceway and rolling elements are seriously worn

The tower crane has abnormal noise during the turning process, which is most likely caused by severe wear of the slewing bearing raceway and the rolling element. At this time, the slewing bearing needs to be repaired or replaced.

The above is the analysis of the slewing bearing failure of the tower crane. Luoyang Hengguan Bearing Technology Co., Ltd. mainly produces slewing bearing/slewing bearing with diameter of 200-9800mm and various high-precision slewing bearings, large thrust ball bearings, non-standard special-shaped bearings, etc. The precision covers four P0, P6, P5, and P4. Grades. Our products are widely used in new energy, medical, amusement, automation, lifting, construction, mining, metallurgy, port, textile, shipbuilding, environmental protection, aerospace, wind power, and other fields.

HGB delivery SE5 with 24V motor slewing drive to Canada

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On October 12, 2019, Luoyang Hengguan Bearing company delivery one set of SE5 with a 24V motor slewing drive to Canada by Express.

This slewing drive SE5 is used for a solar tracker system.

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When received the customer’s inquiry, we provide the customer with professional technical support to help the customer select the model of the slewing drive and confirm the parameters of the motor. Give customers a quote for express shipping costs. Customers give our service the highest appreciation. On the second day after receiving the customer inquiry, the customer places an order and pays.

We seek to be representative of China top quality machinery supplier.

Non-standard segment slewing bearing produced successfully

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Recently, our company (Luoyang Hengguan Bearing) delivered a non-standard segmented slewing bearing for a large-scale winding machine manufactured by a metallurgical company in Hunan. After the customer installed, the design intention of the slewing bearing was realized. Our company’s design capability and production capacity are highly appreciated.

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The outer diameter of the bearing is 2.1 meters, which is completely non-standard according to customer requirements. The customer initially consulted several slewing bearing manufacturers, but in view of the special requirements of the customer, no supplier can provide the solution. We received this consultation from our customers and quickly arranged technical engineers to connect with customers and provide detailed professional technical solutions. At first, customers wanted to use the traditional structure of the slewing bearing to achieve segmentation, opening, closing, turning, etc., but considering that one of the ferrules is not a complete circle, there is a 135 degree gap, so the rolling body will fall off as the ferrule rotates, and the customer’s intention of use cannot be realized. After communicating with the customer, it is determined to be a fixed roller type sliding structure.

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The structure seems simple, but if you want to make several actions uniform and smooth, you need to control the details in design and production. Otherwise, it is easy to open and cannot be completely homing. After closing, the teeth and the circumference are not uniform, such as rotating abnormal sound and other issues. At the beginning of the design of the slewing bearing, through consultation with the customer many times, the general dimensions, structure and articulated form were determined. After the customer determined the plan, our designers deliberately went to the customer site to communicate with the other designers. On-site mapping the details of the program are determined one by one.

The key points of the product are: first, the deformation problem after cutting; second, the hinge connection model; third, the arc and the hole position, and the homing problem after the partial closure. For the deformation problem, our company selected 42CRMO quenching and tempering material, and after the processing (turning to process, hobbing processing), stress relief annealing to ensure small deformation after ferrule cutting. The bearing can not only ensure the rotation, but also can carry a large overturning moment, and the long-term use performance is unchanged; the cutting arc and position are referenced by the design software one by one, and processed by high-precision CNC boring and milling machine to ensure the dimensional accuracy.

For the homing problem after closing, we select both ends to make the positioning pin hole, to ensure the return to the original position after closing, and to ensure the gap of the teeth. After more than 30 days of intense processing, the product was successfully delivered to customers. At the end of the product, the end face jump is 0.1mm, and the radial runout is 0.15mm, which is very good for the customer’s intention.

The slewing bearing is proved by facts that Luoyang Hengguan Bearing has a strong design capability of non-standard custom slewing bearing, high level of professional processing and manufacturing capability. We HGB will insist to provide professional service and high-quality products to our customers.

How to solve the problem of large gap between the top ring and bottom ring of the excavator slewing bearing?

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Excavator is an indispensable mechanical device in the construction of today’s engineering equipment. Powerful robotic arms and buckets can excavate the earth and then load it into the transport vehicle. This series of operations are inseparable from the working device of the excavator. The important joint in the working device is the slewing bearing. The quality of the slewing bearing directly affects the normal operation of the excavator. During the daily use of the excavator, sometimes there is a problem that the upper ring and lower ring gaps of the excavator turntable are large, or the bearing is stuck and damaged. How can we use the maintenance to solve these problems?

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First, the reason and solution for the large gap between the top ring and bottom ring of the excavator slewing bearing

The reason for the large gap between the upper ring and lower ring sides of the excavator is that the lack of grease lubrication causes the rollers to become smaller when the wear is worn, the butter leaks out, and further causes wear, and then the excavator slewing bearing has a problem of large gap between upper ring and bottom ring. That is, the excavator turntable is disassembled, and then repaired, the roller is replaced and repaired, and the repaired excavator slewing bearing should be replaced in time.

Second, the other problems of the excavator slewing bearing and the maintenance

1. Teeth are broken

Broken tooth is another common problem of excavator slewing bearing. It should be stopped in time after the broken tooth, and repair and replacement should be carried out in time. The broken teeth of the excavator slewing bearing are mostly due to improper adjustment of the side gear of the large and small gears during installation, which does not meet the requirements. Causes the two gears to be misaligned during operation, causing broken teeth; or the meshing gap adjustment between the pinion and the pinion is not required as required, causing the pinion to become stuck when the meshing gear is engaged with the large gear toothing position during operation; The non-parallel axes and the slewing bearing mounting bolts are not tightly fixed, so that the large and small gears are poorly engaged and the teeth are broken.

The excavator slewing bearing should be repaired in time after the broken teeth appear. If it is repaired by the maintenance personnel, it must be replaced in time. In order to avoid the occurrence of broken teeth, maintenance should be carried out when the installation is used. The following points should be made: the backlash should be adjusted strictly according to the requirements; the meshing adjustment should be carried out with the small gear in the position where the green paint is applied, and the test should be carried out according to the requirements. Operation ensures that the two gear axes are parallel; tighten the bolts as required; operate in strict accordance with the operating procedures; ensure that the size gears are clean and check frequently.

2. Abnormal sound

The abnormal sound is also one of the common problems of excavator slewing bearings. Abnormal noise is an abnormal sound. It will have a certain sound when it comes to new products. It is normal, but it should be replaced in time when it lasts for a long time. Sometimes it is installed after installation. There will also be abnormal noise. In this case, it is necessary to check whether the installation is correct. The abnormal noise generated during the use may be the lack of grease in the raceway or the foreign matter mixed in the raceway. When the noise occurs, it is necessary to check the excavation in time. Whether the various structures of the slewing bearing are complete, and the fault is eliminated.

The above is the analysis of how to solve the problem of the upper ring and lower ring clearance of the excavator turntable. For the excavator slewing bearing, there will be many problems in the process of use, such as large gap, broken teeth or abnormal noise. These problems should be repaired or replaced in time. If you can’t solve them yourself, you must contact the manufacturer in time to provide professional guidance to avoid direct damage.