Summary:...
The
planetary gearbox is a large number of equipment used in industrial enterprises. Once oil leaks, it will not only cause economic losses, but also cause the reducer to lose oil and cut off oil in severe cases, which will increase the wear of the gear meshing surface, and then cause tooth beating or peeling, resulting in equipment accidents. The oil leakage of the reducer has serious pollution to the surrounding environment and has a corrosive effect on the foundation, which not only destroys civilized production but also wastes a lot of lubricating oil that can be recycled and regenerated.
The oil leakage of the reducer is a common fault phenomenon in the use of the reducer. Correctly analyzing and diagnosing the cause of the oil leakage of the reducer, and taking effective solutions to the cause, is the key to ensuring the normal operation of the reducer and prolonging the service life of the reducer.
Analysis of the reasons for the oil leakage of the reducer
Under normal circumstances, there are five main reasons for the oil leakage of the reducer:
1. The pressure difference generated inside and outside the reducer
In a closed reducer, the friction of each pair of gears will generate heat. According to the Boyle-Mariotte law, as the operation time increases, the temperature in the reducer case gradually increases, while the volume in the reducer case increases. Therefore, the pressure in the box increases accordingly, and the lubricating oil in the box is splashed and sprinkled on the inner wall of the reducer box. The lubricating oil leaks from the gap under the action of the pressure difference.
2. The structure design of the reducer is unreasonable or there are problems in processing
The designed reducer has no ventilation hood or no vent plug on the peephole cover;
The design of the shaft seal structure is unreasonable, and the oil ditch and felt ring type shaft seal structure is adopted. Due to the extremely poor compensation performance of the felt, the seal will fail in a short time;
Although there are oil return holes on the oil ditch, they are easily blocked and the oil return function is difficult to exert.
During the manufacturing process, the castings are not annealed or aged, and the internal stress of the castings has not been eliminated, resulting in the deformation of the gaps and the occurrence of oil leakage;
There are defects such as blisters, slag inclusions, pores and cracks;
Oil leakage caused by poor machining accuracy, due to the existence of factors such as low machining accuracy of the matching surface of the reducer body, unsuitable tolerances, and assembly that does not meet the requirements, the reducer may leak oil.
3. Too much fuel
During the operation of the reducer, the oil pool is very stirred, and the lubricating oil splashes everywhere in the machine. If the amount of oil is too much, a large amount of lubricating oil will accumulate on the shaft seal, joint surface, etc., resulting in leakage.
4. Improper installation and maintenance process
Oil leakage caused by poor installation accuracy. The reducer bears a huge dynamic load when it is started. Once the installation accuracy of the reducer does not meet the standard requirements, it will cause the bolts of the reducer base to loosen, which will intensify the vibration of the reducer and make the seal rings at the high and low speed shaft holes of the reducer. Wear intensifies, causing lubricating oil to flow out. At the same time, during equipment maintenance, oil leakage will also occur due to incomplete removal of dirt on the joint surface, improper selection of sealant, reverse installation of seals, and failure to replace seals in time.
5. Improper choice of oil products
Generally, the reducer is often lubricated with HJ-40, HJ-50 mechanical lubricating oil, and can also be lubricated with HL-30, HL-20 gear oil and HJ3-28 rolling oil. In short, the lubricating oil of the reducer should be selected according to conditions such as load, speed, temperature, etc. It is wrong to blindly pursue the higher the viscosity of the lubricating oil, the better.
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