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1.Slewing Bearing Installation Instructions

1 Disposal before slewing bearing installation
1.1 Anti-rust and packaging
The inner and outer surfaces of the slewing bearing are evenly coated with anti-rust and lubricating oil on both sides of the bearing, and the packaging is wrapped with plastic film kraft paper and linen strips.
around. The outer surface of the large-size slewing bearing should also be wrapped with plastic cloth. For small size slewing bearings, use wooden boxes.
1.2 Transportation
Keep the bearings as horizontal as possible during transportation, only allow a slight tilt, and avoid large bumps or vibrations. open the package
After installation, screw the lifting bolts into the lifting holes of the inner ring or outer ring to transport the bearing to the installation position.
1.3 Safekeeping
1.3.1 During the rust-proof period before use (within 12 months after the bearing leaves the factory). Do not open the package, if maintenance is required, turn
The raceway, outer surface and tooth surface of disc bearing should be treated with anti-rust treatment.
1.3.2 Lay it horizontally on a dry and flat site.
1.3.3 If the slewing bearing is stored for more than 12 months, it should be re-rusted.
1.3.4 If multiple sets of slewing bearings are stacked together, at least three uniformly distributed bearings shall be placed between each set of slewing bearings in the circumferential direction.
wooden blocks, and the upper and lower blocks should be placed in the same position。

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2 Installation of slewing bearing

2.1 Preparation before installation

2.1.1 The connecting surfaces of the supporting parts shall be machined, and then these surfaces shall be free of burrs and debris. In addition to supporting parts, there should be
In addition to sufficient rigidity, the technical requirements of the connecting surface of the supporting parts shall comply with the provisions of Table 1.

2.1.2 When the radial load exceeds 10% of the axial load, radial positioning shall be provided, and the connecting surfaces that cannot be machined shall be
It is flattened by injection molding.
2.1.3 When unpacking the bearing before installation, care should be taken to avoid damage to the seal and prevent dust from entering the inside of the bearing. in the prescribed
During the anti-rust period, it is not necessary to disassemble and clean before installation.
2.2 Soft belt position
The quenched soft tape of the slewing bearing ring is marked “S”. When installing, the position of the soft belt should be in the non-load area or the non-constant load.
Load zone (The packing plug is always at the soft band of the ferrule.)
2.3 Ring gear inspection
Before the mounting bolts are not fully tightened, the gear meshing inspection should be carried out to ensure that the meshing clearance and the accuracy requirements of the gears are met.
begging.
2.4 Tightening of mounting bolts
When installing bolts, quenched and tempered flat washers can be used, and spring washers are prohibited.
After locating the slewing bearing radially, tighten the mounting bolts crosswise and check the free rotation of the bearing at the same time.
When tightening the bolt, there should be sufficient pre-tightening force, and the pre-tightening force should be 70% of the yield limit of the bolt material.
3 Use and maintenance
3.1 Inspection of mounting bolts and abnormal phenomena
After about 100 hours of operation of the slewing bearing, check the pre-tightening torque of the inner and outer ring mounting bolts, and every 500
Check every hour.
If there are abnormal phenomena such as noise, impact, and sudden increase in power during use, it should be shut down for inspection.

3.2 Lubrication
After the slewing bearing is installed, it should be filled with appropriate grease according to the actual use conditions, and the slewing bearing should be filled while the slewing bearing is used.
Grease is distributed evenly until new grease begins to squeeze out of the sealing lip. Fill it every 50~100 hours.
In high environment and dusty conditions, the oiling cycle should be shorter. Before and after the machine stops running for a long time, new lubrication must be added.
grease.
3.3 Cleaning and assembly of slewing bearing
In the assembled slewing bearing, the parts between sleeves and between rows and between rows are not interchangeable.

When the bearing is disassembled for cleaning, the shaft should be
According to the assembly drawing, the upper and lower half ferrules should be assembled according to the original drilling positions.
The tooth flanks should be cleaned of debris and greased every 10 days.

3.4 Selection of Grease
The lubrication of the slewing bearing, because there are many comprehensive working factors, the user can choose the best lubrication according to the specific requirements.
grease.



High Quality Slewing Bearings

1.Advantages of four-point contact ball slewing bearings

Advantages and applicable working conditions of four-point contact ball slewing bearing The four-point contact ball bearing is a single-row angular contact ball bearing, and its raceway is designed to withstand bidirectional axial loads. The contact angle can be 30 degrees, 35 degrees, and 45 degrees.

The inner ring can be divided into two pieces, which can hold a large number of balls, so it has a large bearing capacity. The bearing is separable, that is, the two pieces of the inner ring and the outer ring with the ball and cage assembly can be installed separately.

Four-point contact ball slew bearing has a compact structure and light weight. The steel ball contacts the arc raceway at four points, which can bear axial force, radial force and overturning moment at the same time, and has strong dynamic load capacity.
Applicable working conditions: The load is generally below 100T, and you can choose single-row four-point contact ball bearings, double-row ball contact ball bearings, and ball-ball combination bearings.

The overall cage and segmented cage can be used to improve stability and service life, and the rotation speed can be appropriately increased to 30rpm-120rpm. The accuracy level is best controlled.

At present, the common four-point contact balls include excavator bearings, truck crane bearings, crane bearings, crawler crane bearings, turret bearings, CT machine bearings, bottle blowing machine bearings, filling machine bearings, turntable bearings, and crane bearings. etc.

slewing bearing Alt.

2.Advantages and features of four-point ball crossed roller three-row roller bearings

The internal structure of the slew ring is basically a four-point ball crossed roller three-row roller bearing. The advantages and characteristics are summarized as follows:

1. Four-point contact ball bearing, flexible, anti-permanent fatigue, highest speed, selection design below 50T

2. Cross roller structure, resistant to permanent deformation, good rigidity. 1797/3230, 1797/2500, and 1797/2635 are typical rough-skinned designs, bulky designs, and high reliability. Among them, cross-tapered roller bearings are the first choice for high-precision bearings for measurement, control, and positioning.

3. Double-row ball bearings, flexible to take into account the load below 100T, such as crane bearings, car crane bearings.

Double row crossed roller bearings, in the same way, taking into account rigidity and load-bearing

3. Three-row roller bearings, a typical example of low-speed, heavy-load, high-precision bearings, are always unfavorable. Mature design and highest reliability. The field of low-speed heavy-duty bearings almost occupies the top edge. Preferred structure above 200 tons.

3.Material selection of slewing bearing

The material of the slewing ring bearing, 45# was selected in the early stage, and it was gradually eliminated due to the poor quenching and tempering performance.

This article focuses on the influence of the materials 42CrMo, 40Cr, 50Mn and GCr15 on the process and quality of the slewing bearing.
As a high carbon steel, 42CrMo has excellent quenching and tempering properties and quenching properties, and is the first choice for slewing bearings.
50Mn has good hardenability and is also a good choice for slewing bearings.
40Cr is also good in terms of mechanical properties, and it is still in the stage of exploration and practice.

GCr15 small slewing bearing can be selected, but milling and drilling in the process are troublesome due to full quenching, so it is generally not recommended.

4.Slewing bearing application

The slewing bearing and the slewing bearing are similar in form, but there are qualitative differences. In short, the slewing bearing is just a mechanism that can rotate in a purely mechanical way.

The slewing bearing needs to realize various loads, precision and measurement and control, as well as realize the driving rotation of various actions.
Features in the field of use of slewing bearings:
◎Port cranes usually use three-row roller slewing bearings with internal teeth or external teeth with a diameter of 4 meters to withstand high overturning moments.
◎Stacker and reclaimer: The turntable bearings used in the stacker and reclaimer are usually ball-column combination type, three-row roller type and cross-roller type, and most of them have a diameter of over 3 meters.

Due to the harsh working environment and large dust, this type of bearing has the characteristics of high bearing capacity, long life and good sealing performance.
◎Ferris wheel: used for the four-point contact ball turntable bearing on the Ferris wheel, the outer diameter is 5000mm larger, and the thickness is 200mm
◎Ship unloader: The slewing bearing for ship unloader usually adopts the structure of three rows of rollers with external teeth, with a diameter of about 4 meters.
◎Tower crane: The slewing bearing for tower crane usually adopts small-sized four-point contact ball slewing bearing or double-row ball slewing, and the diameter does not exceed 2 meters.
◎Radar antenna: The short-wave antenna generally uses a three-row roller structure slewing bearing, and the rotation speed is slow.
◎Shield machine: The diameter of the slewing bearing for shield machine ranges from 2.5 meters to 6 meters, and some have larger diameters. These bearings work under very harsh conditions, with large bearing load, strong corrosion resistance and short life. .
◎Ladle turntable: The slewing bearing for the ladle turntable usually adopts a three-row roller structure. Due to the harsh conditions with dust and high temperature, it has high requirements on the retainer, grease and sealing strip.

 



Converting the kinetic energy of the wind into mechanical kinetic energy, and then converting the mechanical energy into electric kinetic energy, this is wind power generation.

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The principle of wind power generation is to use the wind to drive the windmill blades to rotate, and then increase the speed of rotation through a speed increaser to promote the generator to generate electricity. According to the current windmill technology, at a breeze speed of approximately three meters per second (the degree of breeze), electricity can be started. Wind power is forming a boom in the world, because wind power does not require fuel, and it does not produce radiation or air pollution.
Wind power equipment includes offshore wind power equipment that has emerged in recent years.

The slewing bearings on these equipment are generally large, with a size of 3000-8000mm, and the material is mainly 42crmo. The offshore wind power equipment will also consider anti-corrosion processing. Carburizing and nitriding treatment.



Palletizing robots are the product of the organic combination of machinery and computer programs. Provides higher production efficiency for modern production. Palletizing machines have a wide range of applications in the palletizing industry. The palletizing robot greatly saves labor and space. The operation of the palletizing robot is flexible and accurate, fast and efficient, with high stability and high operating efficiency.

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The palletizing robot system adopts the patented coordinate robot, which takes up a flexible and compact installation space. The idea of building a high-efficiency and energy-saving automatic block forming machine production line in a small area has become a reality. The model is usually a slewing bearing within 1000mm, such as 414,544,644 and other models.



Ladle turret is commonly known as a continuous casting machine; this kind of equipment generally uses three-row roller structure slewing ring bearing, such as 132.45.2500/2800/3150/3550, etc. Materla always 42Crmo.This structured product is a kind of slewing bearing with high load-carrying capacity, mainly used in heavy load operation occasions.

Application Ladle turret

This kind of product consists of three rings, the upper and lower rows of rollers are horizontally distributed, and the radial force is borne by the third row of rollers arranged vertically, so it can bear the axial force and overturning moment in both directions. Because of the high requirement for the load-bearing capacity and safety performance of the products, the three-row roller type slewing bearing is often used.



Filling machines are mainly a small class of products in packaging machines.

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From the perspective of packaging materials, they can be divided into liquid filling machines, paste filling machines, powder filling machines, and granular filling machines; from the degree of automation of production It is divided into semi-automatic filling machine and fully automatic filling production line. The slewing bearing drives the equipment to rotate, so as to realize the automatic filling function. The bearing size can be customized according to the size of the slewing center of the equipment, and the size is from 500mm-2000mm



Excavators, also known as excavating machinery, also known as excavators, are earth-moving machinery that use buckets to excavate materials above or below the bearing surface and load them into transport vehicles or unload them to a stockyard.

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The materials excavated by the excavator are mainly soil, coal, silt, and pre-loose soil and rocks. From the perspective of the development of construction machinery in recent years, the development of excavators is relatively fast, and excavators have become one of the most important construction machinery in engineering construction.We can provide alternative Swing circle for your Komatsu, Liebherr, Volvo, JCB, CASE, Hyundai, etc.There are normal and non standard over 500 hundreds types for you choose.

 



Crane refers to a multi-action hoisting machinery that vertically lifts and horizontally transports heavy objects within a certain range. Also known as crane, aerial crane, and crane.

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The work type of the crane has a very close relationship with the safety performance.

For cranes with the same lifting weight, span, and lifting height, if the work types are different, the safety factors adopted during the design and manufacturing are different, that is, the parts models, sizes, and specifications are different. For example, steel wire ropes and brakes have different safety factors due to different work types (small safety factors for light classes and large safety factors for heavy classes), and the selected models are different.

The most famous brands such as Kato, Tadano, Liebherr, etc. LYMC will equip you with a slewing bearing suitable for you according to your model.

 



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These particular slewing bearings require strict process control. Low & constant rotating torque, as well as weight saving by light design are also key factors to ensure our customers the best products.



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Forest Machinery requires strong components, Our finishing by grinding brings a valid pre-loading which is very important for the life time of the bearing and the comfort of the forest machine’s drivers.

Modern logging equipment is mainly logging machine, which is very important for the life time of the logging excavator, Forest Machinery requires strong components, Our finishing by grinding brings a valid pre-loading which is very important for the life time of the bearing and the comfort of the forest machine’s drivers.
The Slewing ring bearing always used dia within 1000mm.Please send us the tyeps or your demands, we can design the bearing for the special machinery.

 


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