The rotating components that must be subjected to dynamic balancing experiments refer to parts with high rotation speed or relatively large rotation diameter. This is related to the design requirements or the standard requirements of the product.
Dynamic balance test: It is the process of dynamic balance detection and correction of the rotor to meet the usage requirements.
When parts make rotating motion, such as various transmission shafts, spindles, fans, water pump impellers, cutters, motors and turbine rotors, they are collectively called rotary bodies. Under ideal circumstances, the pressure on the bearing is the same when the rotary body is rotating and not rotating. Such a rotary body is a balanced rotary body. However, various rotary bodies in engineering have various factors such as uneven materials or blank defects, errors caused in processing and assembly, and even asymmetrical geometric shapes during design. When the rotary body rotates, every part of it has The centrifugal inertial forces generated by tiny particles cannot cancel each other out. The centrifugal inertial forces act on the machinery and its foundation through the bearings, causing vibrations and noise, accelerating bearing wear, shortening the life of the machinery, and in severe cases, causing destructive accidents. To this end, the rotor must be balanced to achieve the allowable balance accuracy level, or the resulting mechanical vibration amplitude must be reduced within the allowable range.
The difference between dynamic balance and static balance of the rotor: 1) Static balance: Calibrate the balance on one correction surface of the rotor, and the remaining unbalance after correction is to ensure that the rotor is within the allowable unbalance when it is static Within the specified range, it is static balance, also known as single-sided balance. 2) Dynamic balancing: Calibration and balance are performed on both correction surfaces of the rotor at the same time, and the remaining unbalance after correction is ensured to be within the specified range of the allowable imbalance when the rotor is dynamic. This is dynamic balancing, also known as double-sided balancing.
Selection and determination of rotor balance 1) How to choose the balancing method of the rotor is a key issue. Usually, the diameter D of the specimen is determined by the distance b between the two correction surfaces. That is, when D/b ≥ 5, the specimen only needs to be statically balanced. On the contrary, it must be dynamically balanced. 2) However, according to the usage requirements, as long as the rotor is satisfied with the purpose after balancing, if it can be statically balanced, it is not necessary to do dynamic balancing; if it can be dynamically balanced, it is not necessary to do static balancing. The reason is very simple. Static balancing is easier to do than dynamic balancing, saving work, effort and cost.