Publish Time: 2019-06-15 Origin: Site
Rotary bearing is a kind of large bearing which can bear comprehensive load, and can bear large axial, radial load and overturning moment at the same time. Slewing bearing is also called rotary bearing. Some people also call it rotary bearing and rotary bearing. Slewing support is widely used in the real industry. It is called "the joint of machine". It is an important transmission part of the machinery that needs to rotate relative motion between two objects and bear axial force, radial force and overturning moment at the same time. With the rapid development of machinery industry, slewing support has been widely used in marine equipment, construction machinery, light industrial machinery, metallurgical machinery, medical machinery, industrial machinery and other industries. Next, we briefly introduce one of the light slewing bearings.I hope this article can help you better understand the application of light slewing bearing and the installation of light slewing bearing.
The main points are as follows：
♦ What is light duty slewing bearing
♦ Size of slewing bearing application
♦ Light slewing bearing installation
Light slewing bearing has the same structure as ordinary slewing support, which is light in weight and flexible in rotation. The light slewing bearing is widely used in food machinery, filling machinery, environmental protection machinery and other fields. Among the large-scale industrial parts, the light slewing bearings can be said to be the most widely used one. At present, there are more or less such parts in all kinds of large, medium and even small machinery, and its development prospects are also very obvious.
This light duty slewing bearing is also listed as the current national professional research project, many scientists day and night, in order to transform this part more sophisticated, so that the conversion of power and force in machinery can reduce losses, have a better conversion ratio, so that the role of the part itself can play a greater role. In addition, the current manufacturers in the production of slewing bearings, but also pay great attention to the improvement of light duty slewing bearing , if a good part is improved, it can instantly improve the use of mechanical power conversion effect, which is relatively to improve the overall performance.
Rotary bearing is a new type of component which has been rising gradually in the last 40's. It is composed of inner and outer rings, raceways and gears. It is also a large bearing which can bear comprehensive loads. It can bear both large axial and radial loads and overturning moments. So for users, knowing their specifications and models can choose appropriate slewing support. Today, we are going to talk about some dimensions of slewing support application, hoping to help you.
01 Series: Single Row Four Point Contact Ball
The single-row four-point contact spherical slewing bearing is composed of two seat rings. It has compact structure, light weight, and four-point contact between the steel ball and the arc raceway. It can withstand the axial force, radial force and overturning moment at the same time. Rotary conveyor, welding manipulator, small and medium crane and excavator can be selected.
Series 02: Double-row balls with different diameters
Double volleyball slewing support has three seat rings, steel balls and isolators can be directly arranged into the upper and lower raceways, according to the force conditions, the upper and lower rows of steel balls with different diameters are arranged. This kind of open assembly is very convenient. The bearing angle of the upper and lower arc raceway is 90. It can bear a great deal of axial force and overturning moment. When the radial force is greater than 0.1 times the axial force, the raceway must be specially designed. The axial and radial dimensions of double-row spherical slewing bearings with different diameters are relatively large and the structure is tight. Especially suitable for tower crane, truck crane and other loading and unloading machinery with medium or above diameter.
11 Series: Single Row Cross Roller
Single row cross roller slewing support is composed of two seat rings. It has compact structure, light weight, high manufacturing accuracy, small assembly gap, high requirement for installation accuracy. Rollers are 1:1 cross-arranged, and can withstand both axial force, overturning moment and large radial force. It is widely used in crane transportation, engineering machinery and military products.
13 Series: Three Roller Rollers
Three rows of roller slewing support have three seat rings. The upper and lower raceways and the radial raceways are separated, so that the load of each row of roller can be determined accurately. Being able to bear all kinds of loads at the same time, it is the largest load-bearing capacity of the four products. Its axle and radial dimensions are large and its structure is firm. It is especially suitable for heavy machinery requiring larger diameter, such as bucket wheel excavator, wheel crane, marine crane, port crane, steel platform and large tonnage truck crane.
Single-row cross-roller slewing support is composed of two seat rings. It has compact structure, high manufacturing accuracy, small assembly gap and high requirement for installation accuracy. Rollers are 1:1 cross-arranged. It can bear axial force, overturning moment and large radial force at the same time. It is widely used in transportation, engineering machinery and military products.
Other series：
Single row four point contact ball (QU, QW, QN series)
Four-point contact type (VL series)
Four-point contact type (VS series)
Four Point Contact (V Series)
Single Row Cross Roller (XS Series)
Single Row Cross Roller (X Series)
Above is the complete specifications of slewing bearing models. I hope you can choose suitable parts for machinery when choosing bearings.
The installation process of the light slewing bearing is as follows:
1. Avoid contact with any solvents.
Do not paint the sealing belt when sealing ring or entering the raceway.
2. Contact with support connected
Surface must be cleaned. Welding nodules, burrs, paints and other attachments are not allowed. Contact surfaces should be free of lubricants and must be kept dry.
3. When installing, quenching soft strip should be positioned outside the main load area.
4. Pre-tightening bolts shall be star-shaped installation is carried out symmetrically and continuously in 180 direction. Finally, the bolts on the circumference are ensured to have the same pre-tightening force through one pass.
Spring washers are strictly prohibited.
5. Gear meshing clearance
For the rotary support with teeth, the backlash is adjusted according to the highest radial runout point of the pitch circle (three teeth with green paint marking). The minimum value of side clearance is generally 0.03-0.04X modulus. After the final tightening support, the meshing clearance of the pinion gear on the whole circumference should be re-checked.
6. Lubrication
1) When delivery, the slewing bearing raceway is coated with a small amount of No. extreme pressure lithium grease. Users should re-fill the new grease according to different working conditions, and should run while filling to make the grease evenly distributed.
2) The first lubrication of teeth must be done immediately after installation. Tooth surface must has enough lubricant film.
3) The rotary bearing raceway should be regularly filled with grease. General ball support per carriage lubricating grease should be added for 100 hours of rotation and for roller support, grease should be added for 50 hours of operation. For the support under the special working environment such as high temperature or more dust, the period of fat-filling should be shortened appropriately. Before and after the equipment stops running for a long time, it must be added enough grease. Every lubrication must be filled with grease in the raceway until it seeps out from the seal.
7. Inspection of bolts
After 100 hours of continuous operation, the pre-tightening force of the installed bolt should be checked thoroughly, and the above checks should be repeated every 500 hours of continuous operation.
8. Check the sealing system
Sealing belts and systems must be checked at least once every 12 months. In proper operation, the sealing belt must be kept intact. When cleaning parts, the cleaner should be avoided from touching the sealing belt or entering the raceway system.
In this way, the installation of the light slewing bearing is successful.
Above is a brief introduction to the application of light slewing bearing . If you have any doubts about other slewing support such as light slewing bearing in the selection process, please consult us.