How to determine whether the vibration fault of WPDO175-40-A worm gear reducer is caused by insufficient installation accuracy

Core conclusion: To determine whether the vibration fault of WPDO175-40-A worm gear reducer is caused by insufficient installation accuracy, the core is to look at the correlation between vibration and installation related parameters. Through three steps of "appearance inspection+vibration characteristic analysis+targeted verification", accurate judgment can be made.
1. First, conduct a visual and basic inspection (quickly identify installation issues)

Check the fixing bolts: whether the anchor bolts, flange bolts connecting the motor and reducer, and bearing end cover bolts are loose, even if there is bolt wear or base thread slippage. Check whether the vibration is significantly reduced after tightening.

Check the base and support: Check if the base is deformed, if the ground is uneven, or if the concrete foundation is cracked. Use a level to detect the levelness of the equipment (allowable deviation ≤ 0.2mm/m). If the levelness exceeds the standard and there is no obvious frequency pattern of vibration, it is likely to be a problem with the installation support.

Check the status of the coupling: Remove the coupling guard, observe whether the coupling is eccentric, whether the elastic pad is worn/detached, manually rotate the shaft system to feel whether there is any jamming. If the coupling end face jumps significantly, it may be a misalignment of the shaft system.

2. Analyze vibration characteristics (core judgment basis)

Vibration frequency characteristics: There are no obvious harmonics of the worm gear meshing frequency (gear ratio x input speed) in the vibration spectrum, but rather low-frequency vibration (1 times synchronous with the speed) is dominant, and the vibration amplitude increases linearly with the increase of speed, which conforms to the vibration rules caused by installation deviation.

Vibration direction and distribution of measuring points: The horizontal/vertical vibration difference between the input and output bearing seats is small, and the vibration amplitude at the fixed bolt of the base is significantly higher than that in the middle of the casing. Alternatively, after adjusting the motor position and tightening the bolts, the vibration parameters (velocity effective value, acceleration) are significantly improved.

Vibration stability: The vibration amplitude does not have sudden fluctuations, but gradually increases with running time (bolt loosening intensifies), and the impact of load changes on vibration is relatively small, which is different from component wear (vibration changes significantly with load).

3. Targeted verification (final confirmation)

Tightening verification: Re tighten all connecting bolts according to the standard torque. If the vibration amplitude decreases by more than 30% and there is no significant rebound after running for a period of time, it indicates that the installation problem is caused by loose bolts.

Calibration verification: Use a laser alignment instrument to detect the axis alignment deviation. If the radial deviation is greater than 0.05mm or the angular deviation is greater than 0.1mm/m, and the vibration returns to the qualified range after calibration (effective velocity value ≤ 4.5mm/s), it is confirmed that the alignment accuracy is insufficient.

Support adjustment verification: After installing adjustment shims on the base to correct the levelness, or replacing the deformed base, the vibration significantly improved, further proving that insufficient installation support accuracy is the root cause of the fault.