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Professionally provides dynamic balance detection, correction and dynamic balance cleaning equipment for all types of high speed rotating workpieces (from 500 to 10,000 rpm)

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Dynamic balance machine vibration analysis

Dynamic balance machine vibration analysis

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[Abstract]:
Dynamicbalancingmachinevibrationisacommonprobleminhydropowerstations.Ithastheprecautionsofpresetting,making,installing,inspectingandrepairing,andoperating.Theoperatingunithasvibrationsindifferentdegre

Dynamic balancing machine vibration is a common problem in hydropower stations. It has the precautions of presetting, making, installing, inspecting and repairing, and operating. The operating unit has vibrations in different degrees. The specified vibration value of the power station is within a certain allowable range. When the vibration exceeds the specified standard value, it will affect the safe operation of the unit and the service life of the unit. By using and using solutions to eliminate. At the same time, the vibration of the dynamic balancing machine is a complicated problem, but from the end of the vibration, it is generally the end of mechanical equipment, hydrodynamics and electromagnetics. Xiaobian joint practice talks about the vibration problem in the operation of the water turbine generator set.

Dynamic balance machine vibration The vibration caused by the inertial force, frictional force and interference of the force of the unit's mechanical equipment is called mechanical vibration. The elements that cause the dynamic balance machine to vibrate are: rotor mass dynamic imbalance, unit axis misalignment, and lack of guide bearings.

The rotor mass is not balanced. Due to the unbalanced rotor mass, the rotor's center of gravity and the axis produce an unfair distance. When the main optical axis rotates, the main optical axis will produce a buckling deformation due to the effect of the unbalanced mass centrifugal inertial force. The larger the shaft deformation, the more severe the vibration. At the time of production, the static balance and dynamic balance of the rotor should be tried, so that the dynamic imbalance is as small as possible, and the end of such vibration is eradicated.

The axis is not correct. The incorrect axis of the dynamic balancing machine unit will cause two kinds of vibrations: arcuate convolution. Since the rotor and the geometric core of the rotor leave the core of the orbital rotation, lateral and longitudinal vibrations are generated during operation, and the direct rotation of the thrust bearing and the guide bearing constitutes an unbalanced amount, and the centrifugal inertia force can be enlarged, both of which expand the amplitude. From the perspective of operation, it is generally indicated that the number of years of operation is long, the gap between the guide bearings is large, it cannot be repaired, or the quality of inspection is not good. The other is the shimmy. Under hydrodynamic pressure, a shimmy is generated at the thrust bearing. Therefore, it is necessary to find the positive axis during installation and inspection and repair, and the clearance of each guide bearing is within the allowable range. For newly-introduced units, there is generally no violent vibration caused by the axis misalignment. However, for the unit after the operation period, the axis is changed due to some kind of end, such as the thrust head and the shaft are not tight, and the snap ring is compressed. The change or damage of the pad between the thrust head and the mirror plate will cause the engine group to vibrate.

The dynamic balance machine guide bearing is lacking. When the guide bearing is loose, the rigidity is insufficient, the operation is unstable, and the lubricating oil is not good, friction will occur, causing a reverse arcuate convolution, that is, a lateral vibration force. If the guide bearing clearance is too small, the vibration of the rotating shaft will be transmitted to the support and the foundation. The clearance of the guide bearing is too large, and the rotating shaft vibrates greatly. Appropriate guide bearing clearance, it is possible to ensure that the vibration of the rotating shaft and the support are within the allowable range at the same time.