Slewing range of applications

Slewing range of applications
Slewing ring wide range of applications, mainly for lifting machinery (truck cranes, tower cranes, etc.), construction machinery (excavators, loaders, etc.), transportation machinery, materials processing machinery, metallurgical machinery, food processing machinery, as well as military equipment (tanks, anti-aircraft artillery, radar, rocket launchers, etc.), medical equipment, scientific equipment.
Slewing angular contact thrust ball bearing and plain bearings, rolling elements and has a band rolling ring raceway. However, it is compared with ordinary rolling bearing, there are many differences, and they are the following:
Slewing ring sizes are large, its diameter is usually 0.4 to 10 meters, some as high as 40 meters.
Slewing rings are generally required to bear the load of several aspects, not only to withstand the axial force, radial force, but also to withstand large overturning moment. Therefore, often acts as a slewing ring sets ordinary rolling bearings.
Slewing ring operating speed is very low, usually in the 10 rev / min or less. Moreover, in most cases, slewing ring without continuous rotation, but only within a certain angle and from the rotation, the equivalent of the so-called "swing bearing."
In the manufacturing process, materials and heat treatment, etc., slewing ring and rolling sealed angular contact ball bearing are very different.
Typically, the seal ring gear rotational drive and dustproof with a slewing ring on.

Wind turbine bearing's Embalmed

Wind turbine bearing's Embalmed
Wind turbine equipment in the field work, and yaw, pitch Wind turbine bearing part is bare, exposed, and will be subject to air pollution and high humidity may cause corrosion bearing matrix, therefore, exposed bare yaw and pitch bearings site requirements for surface corrosion treatment, commonly used galvanized. If necessary, external galvanized layer paint protection treatment.
(1) generating capacity comparison: magnet synchronous technology of its units wide speed range, at low wind power generation has certain advantages, but its full power frequency characteristics of wind speed leads to increase its power generation capacity advantage will cause the inverter loss rapidly increases.
(2) Cost Comparison: permanent magnet synchronous technology, while reducing or eliminating the gearbox cost, but its generator and full-power converter technology is more expensive than in the double-fed.
(3) THD:. Permanent magnet synchronous technology used in its full power conversion system THD is very high, you must use the harmonic filter. The double-fed unit in THD can be controlled under the former.

Tapered roller bearing structural features

Tapered roller bearing structural features
Tapered roller bearing type code is 30000, tapered roller bearings for the separation of Four-Row Taper Roller Bearing. Under normal circumstances, with tapered especially in the "Rolling bearings tolerance" are involved in the size range of roller bearings between the outer and inner components are interchangeable hundred percent can be used. The angle of the outer ring and the outer raceway diameter has been normalized to the same size and shape provides. When allowed to change in design and manufacturing. To cause between tapered roller bearing outer ring and inner components can be interchanged in common worldwide. Tapered roller bearings are mainly used to bear radial load mainly radial and axial joint load. Compared with angular contact ball bearings, bearing capacity, low speed limits. Tapered roller bearings can withstand axial load in one direction, a direction to limit the axial displacement of the shaft or housing.

Ball bearing profiles and composition structure

Ball bearing profiles and composition structure
There are single row radial Deep groove ball bearing, double row spherical, radial thrust, thrust and thrust to the heart and other structural types. ① single row radial ball bearings: compact, easy to use, and wide application. Mainly used to bear radial load, it can withstand a certain amount of axial load. In the high-speed device, it can also be used to replace the thrust bearing. This Order of the friction is small, extreme high speed, suitable for rigid large double bearing axis.
Structure and composition
Ball bearings are mainly made up of four basic elements: ball, inner ring, outer ring and the cage or retainer. Ball and ring usually high chromium steel, Rockwell hardness of between about 61-65. While maintaining the low hardness compared to the balls and the ring, which material has a metal or metalloid. ball bearing rotation than the ball bearing friction is small, and therefore at the same speed, temperature and friction will be relatively low.

Development Status bearings

Development Status bearings
Bearing is an important foundation for all types of machinery and equipment parts, its precision, performance, longevity and reliability of the host precision, performance, longevity and reliability play a decisive role. Mechanical products, angular contact thrust ball bearing are precision products, comprehensive support not only in mathematics, theoretical physics, and many other disciplines, but also materials science, heat treatment technology, precision machining and measurement technology, digital technology and efficient numerical methods and powerful computer technology and many other disciplines to serve, therefore bearing is a representative national scientific and technological strength of the product.
After the international financial crisis in 2008, the state response to the financial crisis, has taken to increase infrastructure investment and stimulate economic development in the proactive fiscal policy. Benefit from the development of related industries, bearing rapidly expanding sales and profit levels would be enhanced significantly accelerate the development of the industry. According to the National Bureau of Statistics, China bearing manufacturing industry size in 2011 (annual sales income of 20 million yuan or more) companies a total of 1416 companies, total industrial output value of 193.211 billion yuan, an increase of 27.59%; sales revenue of 191.097 billion yuan, an increase of 30.30%; total profit of 12.523 billion yuan, an increase of 26.54% over the previous year.
In recent years, world famous enterprises have entered the Chinese market and establish production bases bearing. The company is not only a global business, and is a global manufacturer, by virtue of their superior brand, equipment, technology, capital and production scale, and domestic enterprises bearing a fierce competition. Domestic enterprises are mainly engaged in manufacturing general Bearing life testing machine, less special and high-end bearing manufacturers, technology is not mature. Therefore, domestic enterprises are to compete with foreign advanced bearing brands, and even beyond, but also need to go through a long period of time in terms of technology development.