How to determine the source of vibration when the FF67D100L4-3KW gearbox body vibrates

When the FF67D100L4-3KW gearbox body vibrates, the source of the vibration can be determined by the following methods:

Check the installation status

Tightening degree of bolts: Use a torque wrench to check whether the foundation bolts and other connecting bolts of the reducer base are loose. If the bolt becomes loose, vibration may occur during operation due to a loose connection.

Installation levelness: Use a level to measure the plane of the reducer base, and the horizontal deviation should be less than 0.1mm/m. If not installed horizontally, it will cause uneven force on the shaft system, leading to vibration.

Inspect mechanical components

Gear condition: Check for gear surface wear, pitting, peeling, tooth profile errors, and other issues. If there is an abnormality in the contact surface of the gear pair, it will cause periodic impact loads, which will intensify the vibration. At this point, the vibration characteristics are manifested as clear peaks of the meshing frequency and its harmonics in the spectrum, possibly accompanied by sidebands of 1/3 harmonics.

Bearing condition: Remove the bearing end cover, manually rotate the shaft, and check for any jamming, uneven resistance, or significant shaking (axial displacement>0.1mm). Alternatively, a stethoscope can be placed close to the bearing area. If a rustling or buzzing sound is heard, or if an amplitude greater than 0.15mm/s (abnormal in the high frequency range) is detected by a vibration meter, it may be due to bearing roller wear or lubrication failure.

Axis alignment: Use a laser alignment instrument or dial gauge to measure the coaxiality between the motor shaft and the input shaft of the reducer. The radial deviation should be less than 0.05mm and the axial deviation should be less than 0.02mm/m. If the alignment deviation is too large, periodic impacts will occur during operation, causing vibration.

Balance of rotating components: Check whether the rotating components such as impellers and shafts are balanced. When the residual unbalance of the rotor exceeds the ISO1940 G2.5 level, centrifugal force will cause power frequency vibration.

View lubrication system

Lubricating oil quality: Check whether the viscosity, cleanliness, etc. of the lubricating oil meet the requirements, and whether there is any deterioration, emulsification, etc. If the lubricating oil deteriorates and cannot form an effective oil film, it will cause direct contact friction between the tooth surfaces, leading to thermal deformation vibration.

Oil level height: Check if the oil level is within the normal range. If the oil level is too low, it may cause insufficient lubrication, increase component wear, and cause vibration; If the oil level is too high, it may increase the operating resistance of the gearbox and cause vibration.

Analyze electrical factors

Power supply voltage and frequency: Measure the three-phase input voltage with a multimeter, with a deviation of less than 5%, and the frequency should be stable. If the voltage is unbalanced or the frequency fluctuates, it will cause the electromagnetic vibration of the motor to intensify, resulting in vibration of the gearbox body.

Motor operating status: Use a clamp meter to measure the motor operating current. If it exceeds 110% of the rated current, it indicates that the load is overloaded, which may cause low-frequency vibration noise during motor overload operation and subsequently cause gearbox vibration.