Vibration velocity sensors are commonly used to monitor bearing vibrations, and in some cases, they can also measure shaft vibrations. Improper installation or weak fixation can lead to distorted readings or even damage the sensor due to excessive vibration. Therefore, it's crucial to carefully select the installation method for these sensors to ensure accurate and reliable measurements.
When measuring shaft vibration, common installation methods include hand-holding, using plasticine to stick the sensor, magnetic chucks, and bolt fixing. For temporary measurements, hand-holding is often preferred due to its flexibility and ease of use. This method is especially useful when there are limited sensors or poor interchangeability. However, it tends to introduce larger errors and requires more physical effort from the operator.
Using plasticine to attach the sensor offers better measurement accuracy compared to hand-holding. However, it should only be used on horizontal surfaces, such as the top of a bearing housing, to measure vertical, horizontal, and axial vibrations. The maximum measurable vibration at 50 Hz is around 300 μm, provided the bonding is secure. But keep in mind that temperature significantly affects the adhesion strength of plasticine.
Plasticine is not suitable for high-temperature environments or for fixing sensors on rotating parts like rotors or reels, where the surface temperature is too high. In cold conditions, such as during winter starts, if the bearing temperature is too low, plasticine may not adhere properly and should be avoided.
Magnetic chucks offer a more stable and convenient option compared to plasticine. In China, permanent magnet chucks with sizes like φ50 mm or 50x50 mm are available, capable of providing up to 196 N of suction force. These are ideal for securing sensors weighing less than 500 g on horizontal surfaces and can measure vibrations up to 1000 μm. However, if the bearing housing is painted or covered in dirt, the suction power may decrease, requiring additional support when measuring on vertical surfaces or with large amplitudes.
Bolt mounting is the most reliable method for installing vibration velocity sensors directly onto the bearing. It allows for accurate measurements in three directions on the top of the housing and also captures vibrations on both sides of the vertical plane. This method is the strongest among all four installation techniques, ensuring the highest level of stability and precision.
In conclusion, the choice of vibration velocity sensor installation depends on the specific requirements of the measurement. Based on the working environment and application needs, one of the four methods should be selected to ensure accurate results, reduce measurement errors, and maintain smooth operation during testing.
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