How to Determine Whether the Vibration of H Series High-Power Industrial Gearboxes is Normal

1、 Initial sensory evaluation without disassembly

1. Running sound: Under normal conditions, there is only a uniform and smooth "buzzing" sound of engagement, without periodic impact noise, sharp friction sound, or irregular "clanging" sound.

2. Vibration sensation: During no-load operation, there is no obvious tingling sensation when the palm lightly touches the bearing seat; Under full load conditions, there is no visible continuous shaking or local resonance phenomenon in the box.

3. Related status: synchronized monitoring of bearing seat temperature ≤ 70 ℃, no abnormal temperature rise, and no sudden fluctuations in motor current.

2、 Quantitative indicator threshold verification

Under standard operating conditions of rated speed and rated load, the core vibration limit refers to the general heavy-duty industrial gearbox specification:

1. Effective value of vibration velocity: Normally, it should be ≤ 4.5mm/s. For high-power heavy-duty models, it can be relaxed to ≤ 7.1mm/s. Exceeding 9mm/s is considered a serious abnormality.

2. Vibration displacement double amplitude: normal should be ≤ 0.05~0.1mm, exceeding 0.1mm requires immediate shutdown for troubleshooting.

3. Vibration acceleration: Under normal operating conditions, the RMS value remains stable within 0.4g without sudden peak impact.

3、 Professional determination of spectral characteristics

By collecting signals through vibration sensors for frequency domain analysis, the spectral characteristics of normal vibration are clear and distinguishable:

1. There is only a stable gear meshing frequency and its low order harmonics, and there are no abnormal sidebands on both sides of the meshing frequency.

2. The amplitude of 1x and 2x frequency conversion is much lower than that of the meshing frequency, and there is no abnormal amplification of single frequency components.

3. There is no prominent peak corresponding to the characteristic frequency of bearing failure (outer ring, inner ring, rolling element characteristic frequency), and the energy distribution in the high-frequency range is stable.

4、 Comparison and verification of historical trends

1. If the vibration data during the acceptance of the newly installed equipment is used as the reference line, and the vibration values measured regularly thereafter do not exceed 1.5 times the reference value, it is judged to be within the normal deterioration range.

2. If the monitoring data shows a continuous upward trend for three consecutive times, even if the current value does not exceed the threshold, potential hazards such as gear wear and increased bearing clearance need to be investigated in advance.