Vibration speed sensors are widely used to monitor bearing vibrations, and in some cases, they can also measure shaft vibrations. However, improper installation or weak fixation can lead to inaccurate readings or even damage the sensor due to excessive vibration. Therefore, it's crucial to carefully select the appropriate installation method for these sensors.
When measuring the vibration of a rotating shaft, common installation methods include hand-holding, using plasticine to stick the sensor, magnetic chucks, or bolt fixing. In temporary measurements, many technicians prefer the hand-held method because it's flexible and easy to use. This is especially useful when there's a shortage of sensors or when they aren't interchangeable. However, this method tends to have higher errors and requires more physical effort.
Using plasticine to attach the sensor is another convenient option, offering better accuracy than hand-holding. However, it should only be used on horizontal surfaces, such as the top of a bearing housing, when measuring vertical, horizontal, and axial vibrations. The maximum measurable vibration at 50 Hz is around 300 μm, provided the bond is firm.
One major drawback of plasticine is its sensitivity to temperature. High or low temperatures can significantly weaken the bonding force, making it unsuitable for high-temperature environments like those found in large rotors or reel wheels. It’s also not recommended during cold starts in winter when bearing temperatures are too low.
Magnetic chucks offer a more stable alternative. In China, permanent magnet suckers with diameters of 50 mm or sizes of 50x50 mm are commonly available, with suction forces up to 196 N. These can securely fix sensors weighing up to 500 g on horizontal surfaces, capable of measuring vibrations up to 1000 μm. However, if the bearing housing is coated with paint or dirt, the suction may weaken. For vertical installations or larger amplitudes, an armrest is often needed to prevent the sensor from falling off.
Bolt fixing is the most reliable method, allowing accurate measurement of vibrations in three directions at the top of the bearing housing, as well as in two directions on the vertical plane. This method provides the strongest and most consistent results among all four options.
In conclusion, the choice of installation method depends on the specific measurement requirements and environmental conditions. By selecting the most suitable technique based on the situation, you can ensure accurate data collection and minimize errors during testing.
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