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Painting skills: analysis of the application of slewing bearings

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Slewing bearing; also known as reversing bearing; F is a large bearing that can accept large axial loads, radial loads and overturning moments together. Slewing bearings generally have equipment holes, internal gears or external gears, smooth oil holes and seals. The device can make the layout of the host machine compact, guide and secure. The slewing bearing has a toothless, external and internal gear four-point touch ball bearing, a double-row angular touch ball bearing, and a perforated cylindrical roller bearing. Interspersed tapered roller bearings and three rows of cylindrical roller combined bearings 簦 various layout types. Four-point contact ball bearings have higher static load capacity, interspersed cylindrical roller bearings have higher dynamic load capacity, and inserted tapered roller bearings Pre-interference enables the bearing to have greater bearing rigidity and higher reversal accuracy. Dingda imported bearings - Miss Wang slewing bearings are widely used in lifting machinery, mining machinery, construction machinery, port machinery, ship machinery and high-precision radar machinery. And the missile launcher 簦 large reversing equipment. Slewing bearings are used in various fields. Wind turbine yaw bearing equipment is at the junction of the tower and the cockpit; the pitch bearing equipment is connected to the hub at the root of each blade. Each wind turbine uses a set of yaw bearings and three sets of pitch bearings. Yaw, The parameters of the pitch bearing ring are 42CrMo; the heat treatment is treated by the whole quenching and tempering; the surface of the raceway is quenched. The yaw and pitch shaft receiving force is complicated; and the impact and oscillation are relatively large; therefore; the bearing needs to accept the impact; It can accept large loads. The life expectancy of wind turbine generators is 20 years; the cost of bearing equipment is relatively large; therefore, the demand yaw and pitch bearing life should reach 20 years. The hardness of bearing ring base is 240-280HB; Accept the impact without plastic deformation; the hardness of the quenching surface of the raceway reaches 55-62HRC; it can increase the fatigue life of the touch; then ensure the longevity of the bearing. Marine cranes Marine cranes generally use double-row ball; four-point touch ball; three-row roller internal gear layout slewing bearing; different depending on bearing capacity; three-row roller slewing bearing is generally used for heavy crane; four-point touch ball turntable And double row ball slewing bearings for light cranes. Because the cranes work in -20 ° C +45 ° C environment; this type of bearings have higher requirements on data mechanical performance. Marine channel cranes have different requirements depending on the bearing capacity; marine channel cranes generally use four-point touch ball carousels and three rows of roller internal gear slewing bearings. Port mobile cranes port cranes generally use three-row roller slewing bearings with internal or external teeth diameter of 4 meters; to accept high overturning moments. Dingda imported bearings - Miss Wang 5. The slewing bearing for the stacker and reclaimer is generally selected from the combination of ball and column; the three-row roller type and the intervening roller type; the diameter is mostly over 3 meters. Due to the harsh working environment; the dust is large; High; long life; good sealing performance. 6. The Ferris wheel is used for the four-point touch ball slewing bearing on the Ferris wheel; the outer diameter is 4100mm; the thickness is 85mm7. The slewing bearing for the ship unloader unloader generally uses a three-row roller arrangement with external teeth; the diameter is about 4 m.8. The slewing bearing for tower cranes generally uses small-scale four-point touch ball slewing bearings or double volleyball turntables; the diameter does not exceed 2 meters. 9 radar antenna short-wave antennas generally use three rows of roller layout slewing bearings; rotation speed is slow. Shield machine shield slewing bearing diameter from 2. 5 meters to 6 meters; there is a larger diameter; such bearings work under very harsh conditions; bearing load bearing; corrosion resistance; short life. 11. The slewing bearing for the ladle reversing table ladle reversing table generally adopts three rows of roller layout; it operates under the harsh conditions with dust and high temperature; it has high demand for the adherer; smooth grease and sealing strip. The slewing bearing for engineering machinery engineering machinery generally uses small-scale four-point touch ball slewing bearing; the diameter does not exceed 2 meters.

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