The cross roller bearing of the crane plays the role of connecting the carriage and chassis parts in the rotary mechanism, and supports the whole rotating part of the crane.If the damage of steel ball slewing bearing, rolling wear will affect the work of slewing mechanism, serious when slewing mechanism will be rotary, the phenomenon such as noise, heavy rotary hydraulic system pressure will exceed the rating at the same time.When the lifting and unloading are stopped, the vibration of the slewing bearing down or upward will be too large, indicating that the clearance volume of the rotary support is seriously exceeded.At this time, the rotary support should be repaired or replaced.The general cause of mechanical failure is the lack of maintenance and improper use of cross roller bearing.
Therefore, in order to avoid the normal operation of crane slewing, we should pay attention to the daily maintenance and maintenance of the crane and its cross roller bearing.When the crane in more environments have strong corrosion resistance and dust homework, or after a larger after the rain, will be in a timely manner to wipe, internal lubricant filling right amount to meet the requirements of slideway, external coating some anti-rust oil, etc.Lubricate your mouth frequently to prevent blockage.It is necessary to check the tightness of the bolts to prevent the excessive clearance of the upper and the glide path due to the loose bolts, resulting in the wear of the steel ball and the raceway.
In general, there are two main points of improper use:
1) In lifting the levelness of the slewing crane chassis when working for not good, or in the soft ground operations are not as strong as four leg cushion, will cause on the return trip has, downhill, the rotary speed and the system pressure is different, so easy to cause the raceway uneven wear, but also easy to make rolling body skin off residue or cracks, accelerated wear and tear.
2) Suspension weight, when the basic arm suspension, inclined condole of a distance of a crane weight and reach the purpose, often mistakenly use the slewing mechanism to sew, it is in violation of safety operating rules, and cross roller bearings can damage to the slewing mechanism, the basic arm.
When the pressure of the rotary hydraulic system is low, the sound and speed of the turning process are normal when the crane is in no-load and light load.When overloading, there will be the phenomenon of turning difficulty or even turning.The reason for this phenomenon is that the spring of the overload buffer valve of the rotary hydraulic system becomes soft.Rotary hydraulic system pressure is accomplished by the overload cushion valve adjustment screw, the adjusting screw and the effect of seal oil, in order to ensure the oil seal, the screw must be tight, but it also cannot adjust the spring pressure.When spring pressure is not enough, it is only used in the spring-end gasket method to solve, most maintenance manufacturers also adopt this method.
When pull (slewing mechanism operating handles the slewing mechanism began to run, so the slewing brake and slewing mechanism cannot be synchronized movements, the cross roller wheel bearing slewing brake after open, such resistance is too large to turn even turn to be not moved.At this point, if you continue to increase the throttle and increase the Angle of the turn handle, you will make the rotation pressure too high or even exceed the rating, leading to the damage of other weak components or the leakage of the pipeline.At this time, it is necessary to repair the brake oil road, clean or replace the hydraulic components in the oil circuit, so that the brake oil road remains unblocked.
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