The common oil leakage methods in industrial robot gearbox reducers are mainly as follows:
1. Oil leakage from the output of the gear reducer: This is the most common type of oil leakage.
2. Oil leakage at the input of the geared motor: Oil leakage at the connection between the geared motor and the reducer.
3. Oil leakage from the reducer oil hole: The operating speed and oil volume are used to determine the leakage.
Analysis of the causes of oil leakage in the gearbox reducer of ABB robots:
1. Since the oil seal is a key factor in the sealing effect of the gearbox reducer shaft, the friction causes long-term continuous warm sliding contact between the oil seal and the shaft, resulting in grinding and wear of the sealing work; the speed of the shaft also affects the temperature rise, the higher the temperature, which causes the oil seal to wear and burn, resulting in the failure of the oil seal and shortening the service life of the oil seal.
2. Long-term use of the speed reducer leads to deterioration of the journal wear, reducing or even eliminating the sealing effect of the oil seal; at the same time, the surface roughness of the speed reducer shaft is also an important cause of oil seal wear.
3. If too much oil is added, the oil sump will be violently agitated during the operation of the reducer, and the lubricating oil will splash everywhere inside the machine. If too much oil is added, a large amount of lubricating oil will accumulate on the oil seal mating surface, leading to leakage.
Common Fault Analysis of Oil Leakage in ABB Robot Gearboxes
Due to the harsh operating environment of industrial speed reducers, failures such as wear and leakage often occur, manifesting in the following aspects:
(1) Wear of the bearing housing of the reducer.
This includes wear on the housing bearing box, the inner bore bearing chamber of the housing, and the gearbox bearing chamber. This situation mainly occurs when the parallelism and coaxiality of the shafts are not properly adjusted during the installation of the shafts and bearings. During long-term operation, eccentric forces (radial or axial) or abnormal vibrations of the housing occur, causing the shafts and bearings to be subjected to force and resulting in certain wear on the bearing chambers.
(2) Wear of the gear shaft diameter of the reducer.
Repairing oil leaks in ABB robot gearboxes, primarily affecting worn areas such as the shaft head and keyway. The causes of this type of failure include frequent overload starts during operation and material defects in certain components.
(3) Wear of the bearing seat of the reducer drive shaft or bearing failure.
Improper assembly can not only accelerate bearing wear but also lead to failures such as breakage and high-temperature seizing. In particular, for bearings that cannot self-align, poor machining accuracy of the journal or bearing housing bore, improper installation, and excessive shaft deflection can all cause the inner and outer rings of the bearing to tilt relative to each other, resulting in uneven distribution of the bearing's working load and premature failure at the points of concentrated pressure.
(4) Leakage at the joint surface of the reducer.
Oil leakage at the gearbox housing mating surfaces and bearing end covers is mainly caused by flaws in the application process of the sealing gaskets or sealant. Improper maintenance procedures, such as incomplete cleaning of contaminants from the mating surfaces, improper selection of sealant, reversed installation of sealants, or failure to replace sealants in a timely manner, can also lead to oil leakage. These issues can be avoided by strengthening assembly process requirements.
(5) Gear failure of the reducer.
Common failure modes of gear teeth include tooth breakage and damage to the tooth surface. Tooth breakage generally occurs at the tooth root because the bending stress is greatest and there is stress concentration at the tooth root. Damage to the tooth surface can be classified into fatigue pitting, abrasive wear, scuffing, and plastic deformation.
Measures to prevent gear tooth failure include: increasing tooth surface hardness and surface roughness requirements; selecting lubricants with higher viscosity; supplying sufficient lubricating oil and keeping the lubricating oil clean; avoiding frequent starts and severe overloads and impacts; improving assembly quality and strengthening maintenance management.
ABB robot oil leak repair solutions:
1. Replace the seals;
2. Inspect the split surfaces of the enclosure; replace if severely deformed.
3. Clean the oil return tank and tighten the bolts.
Currently, micro gear reducers are designed with a closed structure and possess functionality.
For repairs of ABB robot gearbox reducer oil leaks, ABB robot joint oil leaks, robot gearbox oil leaks, and other ABB robot repair and maintenance, it is essential to find a professional robot repair company.
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