The introduced the development of Slewing ring
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Author:Xu Limin Slewing bearing device is nearly 30 years ago developed a new type of machine parts, he has used excavators and cranes, and gradually developed to be used for other machinery. Large slewing ring close to the rolling bearing device. Figure 1-1 for the two-volleyball-style rotary bearing structure diagram. Figure 1-2 reflects the slewing hydraulic crawler excavators in the application of the machine it will connect the upper and lower to the upper bearing of the weight and work load, and the upper part can rotate relative to the lower part.
1 ．Outside the rolling circle (up); 2, outside the rolling circle (down) 3, with the rolling circle (with inner teeth) 4, the rolling body (ball); 5 sealed
Slewing bearing a wide range of applications, mainly for lifting machinery (truck crane, tower crane, etc.), construction machinery (excavator, loader, etc.), transport machinery, materials processing machinery, metallurgical machinery, food processing machinery, as well as military equipment (tanks, artillery, radar, rocket launcher, etc.), medical machinery, scientific research equipment. Slewing ring bearings and the general, as with all the rolling and the rolling circle Raceway. However, compared with an ordinary rolling bearing, there are numerous differences, the main points are as follows: • Slewing Bearing size are large, their diameter usually 0.4 to 10 meters, some as high as 40 meters. • Slewing Bearing the general aspects have to bear the load, not only have to bear the axial force, radial force, but also under the tipping torque larger. Therefore, often from a slewing ring roller bearing several ordinary role. • the operation of slewing speed is very low, usually in the 10 r / min the following. In addition, in most cases, no continuous slewing bearing slewing, and only within a certain angle from the rotation, which is equivalent to the so-called "swing bearing." The past, cranes, excavators and other machines, the main take-column (Center pivot-type) slewing bearing, slewing bearing, such as turn-column (Figure 1-3), scheduled for slewing column (Figure 1-4) and the turntable slewing bearing type. Turntable slewing ring roller fulcrum and less (Figure 1-5) and multi-roller fulcrum-style jacket (Figure 1-6). The former, also known as roll-style hook, the latter also known as multi-roll style. At present, these devices have been gradually rolling bearing slewing ring replaced by type. Slewing ring and compared to the past, which mainly has the following advantages: • Light and flexible operation, turning the small resistance; Figure 1-7 (a) shows a portal crane with slewing bearing column of the switch. The device under the support of a tapered roller bearing and a spherical roller bearing in order to bear the axial force and radial force [Figure 1-7 (b)], or only a push to the heart
Figure 1-4 schematic set slewing column
At the same time bearing to bear the axial force and radial force [Figure 1-7 (c)]. And on the support of a large radial bearings, the general level of the number of rollers in order to bear on the level of support force. Such as parts of the rotary-type slewing ring bearings (Figure 1-8), can significantly reduce the whole center of gravity and cost. China from the early sixties, began in the use of excavators and cranes slewing ring bearing type. However, mining machinery plant in Hefei in W1-06 and W3-06-type excavator, using the foreign double of 1600 mm type slewing bearing; Beijing crane factory produced 16 tons crane tires used in dual-volleyball-style slewing bearing. Since then, the domestic revolving cranes, excavators, such as Stacker of new products, the vast majority are type slewing ring bearings. At present, foreign national has produced a 16-meter-type slewing bearing (hereinafter referred to as slewing ring) for the stacker-reclaimer. At the end of the sixties, cross-ball type slewing bearing in China have gradually gained a wide range of applications. In recent years, has begun the design and manufacture of three-row ball-style, three-row roller slewing bearing cone. The past, the bulk of our production plant host, slewing bearing most of their own manufacture, gross embryo plant root system by the tires; host small production units, many slewing outsourcing solution. Luoyang Bearing Factory, Xuzhou and Ma On Shan bearing slewing ring for factory are specialized production slewing ring. Abroad, mostly from slewing ring bearings company specialized production, the company has its own situation, family size. The main production are: the Federal Republic of Germany Rot Ed (ROTHE ERDE) and FAG company, RKS companies in France, the United Kingdom and Thailand rex Park (TAPEREX) company, Fuji in Japan and Vietnam, NSK, KOYO companies, as well as the United States, the Soviet Union , democratic Germany some companies and factories. Ed Roth of the Federal Republic of Germany is one of the most famous companies, to produce 0.35 ~ 40 meters in diameter slewing ring of an annual output of 54,000 sets, and multi-species, the right specifications. SKF is a large industrial group in Europe, but also the world's oldest established the most technologically advanced bearing manufacturing company in the United Kingdom, France, Federal Republic of Germany, Italy have a branch in the Netherlands has a comprehensive modern experimental centers, including company in Sweden. He set up a branch in France-RKS company was founded in 1932, has 330 employees, mainly products are cross-ball-style, single-row four-point contact and two-row roller slewing ring, product diameter of 0.5 ~ 5m, in more than 1600 sets of production. Rex Park Thailand United Kingdom have also banned 30-year history, there are currently 110 employees, only the production of Cross Roller Slewing Bearing cone, product diameter of 0.5 to 3 meters, annual production capacity of 2,500. Which hosts 60 percent for domestic support, and the rest exported to the United States, the Middle East and other countries and regions. The product form of pure rolling, the resistance was less, but more complex processing.
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