Mechanical failure
Crane slewing bearing plays the role of connecting the truck and chassis parts in the rotary mechanism, and also supports the whole rotating part of crane.If the steel ball in the swing bearings is damaged and the raceway abrasion will affect the work of the rotary mechanism, in severe cases, the rotary mechanism will be heavy and make noises, and the pressure of the rotary hydraulic system will exceed the rated value.When hoisting and unloading are carried out at the stop of rotation, the vibration amount of the slewing bearings will be too large at the moment of falling and falling together, indicating that the clearance amount of the slewing ring has seriously exceeded the limit.At this point, the turntable bearings should be repaired or replaced.
The general causes of mechanical failure are inadequate maintenance and improper use.
When the crane is operating in a highly corrosive and dusty environment, or after a large amount of rain, it should be promptly wiped, the inside of the slide is filled with a suitable amount of lubricant that meets the requirements, and the outside is coated with anti-rust oil.The injection nozzle should be regularly dredged to prevent blockage.The tightening degree of bolts should be checked frequently to prevent excessive clearance of upper and lower track caused by loose bolts and wear of steel ball and raceway.
Improper use, there are two main one is that 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.Second, it is inclined to pull heavy objects. When the basic arm of the crane is inclined to pull and the weight far away from the crane is not able to reach the goal, it is often wrong to use the rotary mechanism to pull the heavy objects.
Failure of low pressure in rotary hydraulic system
When the pressure of the rotary hydraulic system is low, the sound and speed of the rotary process are normal under the condition of no load and light load.Heavy load will be difficult to turn or even unable to turn the phenomenon.The reason for this phenomenon is that the spring of the overload buffer valve of the rotary hydraulic system softens.The pressure of the rotary hydraulic system is achieved by adjusting the screw of the overload buffer valve, which also ACTS as the sealing oil circuit. In order to ensure the sealing of the oil circuit, the screw must be tightened, but the pressure of the spring cannot be adjusted at will.When spring pressure is insufficient, it can only be solved by adding a washer to the end of spring, which is also adopted by most maintenance manufacturers.
A failure in which the pressure of the rotary hydraulic system is too high or even exceeds the rated value
When the operating handle of the trigger rotary mechanism makes the rotary mechanism start to run, the rotary brake and the rotary mechanism cannot operate synchronously, that is, the rotary brake is opened after opening, so that the rotary resistance is too large or even unable to move.If you continue to increase the throttle, increase the Angle of the rotating handle, the rotary pressure will be too high or even exceed the rated value, resulting in damage to other weak components or pipeline leakage.At this point, it is necessary to overhaul the brake oil circuit, clean or replace the hydraulic components in the oil circuit, so as to keep the brake oil circuit unimpeded.
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