The hazards caused by rotor imbalance are multifaceted. When the rotor rotates, it will generate unbalanced centrifugal force due to its imbalance, which will cause rotor deflection deformation and internal stress. This deformation and internal stress can cause rotor fatigue and even lead to rotor fracture. This force will also be transmitted to the machine base through bearings, causing vibration and noise in the machine equipment, accelerating the wear of bearings and seals, reducing the working accuracy and efficiency of the machine, shortening the service life of the machine, and sometimes even causing loose fit and component breakage, leading to major accidents and huge economic losses. Practice has shown that more than 30% of faults in motors with excessive vibration are caused by the unbalanced mass of the rotor itself. Rotating parts and components that have undergone dynamic balance correction can eliminate and reduce mechanical vibration, extend the service life of the components, and reduce noise.
The unbalance is an absolute value, while the rotational speed only converts the unbalance into a dynamic load. The balancing machine equipment converts the dynamic load into an electrical signal through sensors, and finally restores it to the unbalance through amplifiers, filters, etc. The selection of rotational speed depends on various factors such as the balancing machine equipment and the inherent frequency of the rotor. According to the theory of dynamic balance, the unbalance of the rotor is not related to the rotational speed.
Factors causing rotor imbalance in universal joint dynamic balancing machine:
1. The rotor structure of the universal joint dynamic balancing machine is asymmetric, and the most typical example is the crankshaft. The asymmetry in the crankshaft structure is determined by its working characteristics, so it is necessary to weight the crankshaft in the design. Before leaving the factory, each crankshaft must undergo a balance test, and the remaining unbalance can only be put into use if it meets the requirements.
2. Defects in raw materials or blanks that cause rotor imbalance are common phenomena in mechanical engineering, such as uneven density of raw materials, porosity, sand holes, and loose structure in blanks, uneven welds, etc.
3. Errors in the machining or assembly of the rotor of the universal joint dynamic balancing machine.
If there are errors in the processing or assembly of the rotor, it will also change the mass distribution of the rotor, thereby disrupting the balance state of the rotor. For example, different shafts between the rotor and the journal axis, varying degrees of tightening of connecting screws, or bending deformation caused by welding can all cause rotor imbalance. Due to the above reasons, there is a certain degree of rotor imbalance problem. The sum of all imbalance vectors distributed on the rotor can be considered as a vector concentrated on the "key point". Dynamic balancing is a technique for determining the position and size of the key point of an unbalanced rotor, and then removing or adding an equally sized counterweight at its corresponding position.
Factors affecting the balance of the universal joint calibration:
1. Imbalance caused by manufacturing tolerances specified in the design specifications for the main components of the universal joint.
2. The imbalance caused by the eccentricity of the alignment surface between the universal joint and the shaft.
3. The gap between the mating parts in the universal joint.
4. Unbalance caused by uneven or asymmetrical distribution of attachments in universal joints.
5. Imbalance caused by uneven material or wear of various parts of the universal joint.
The unbalance is an absolute value, while the rotational speed only converts the unbalance into a dynamic load. The balancing machine equipment converts the dynamic load into an electrical signal through sensors, and finally restores it to the unbalance through amplifiers, filters, etc. The selection of rotational speed depends on various factors such as the balancing machine equipment and the inherent frequency of the rotor. According to the theory of dynamic balance, the unbalance of the rotor is not related to the rotational speed.
Factors causing rotor imbalance in universal joint dynamic balancing machine:
1. The rotor structure of the universal joint dynamic balancing machine is asymmetric, and the most typical example is the crankshaft. The asymmetry in the crankshaft structure is determined by its working characteristics, so it is necessary to weight the crankshaft in the design. Before leaving the factory, each crankshaft must undergo a balance test, and the remaining unbalance can only be put into use if it meets the requirements.
2. Defects in raw materials or blanks that cause rotor imbalance are common phenomena in mechanical engineering, such as uneven density of raw materials, porosity, sand holes, and loose structure in blanks, uneven welds, etc.
3. Errors in the machining or assembly of the rotor of the universal joint dynamic balancing machine.
If there are errors in the processing or assembly of the rotor, it will also change the mass distribution of the rotor, thereby disrupting the balance state of the rotor. For example, different shafts between the rotor and the journal axis, varying degrees of tightening of connecting screws, or bending deformation caused by welding can all cause rotor imbalance. Due to the above reasons, there is a certain degree of rotor imbalance problem. The sum of all imbalance vectors distributed on the rotor can be considered as a vector concentrated on the "key point". Dynamic balancing is a technique for determining the position and size of the key point of an unbalanced rotor, and then removing or adding an equally sized counterweight at its corresponding position.
Factors affecting the balance of the universal joint calibration:
1. Imbalance caused by manufacturing tolerances specified in the design specifications for the main components of the universal joint.
2. The imbalance caused by the eccentricity of the alignment surface between the universal joint and the shaft.
3. The gap between the mating parts in the universal joint.
4. Unbalance caused by uneven or asymmetrical distribution of attachments in universal joints.
5. Imbalance caused by uneven material or wear of various parts of the universal joint.
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