During the operation of the centrifuge, if the rotor is unbalanced, an accident will occur. So how can we avoid such phenomena? Dynamic balancing experiments are needed to ensure the balance between the rotor and the main shaft.
A balancing machine is a machine that measures the magnitude and position of the unbalanced amount of a rotating object (rotor). When any rotor rotates about its axis, centrifugal force is generated due to uneven mass distribution with respect to the axis. This unbalanced centrifugal force acts on the rotor bearings, causing vibration, generating noise and accelerating bearing wear, which can seriously affect the performance and life of the product. In the manufacturing process, the rotor parts of the motor need to be balanced to run smoothly and normally. Correcting the imbalance of the rotor according to the data measured by the balancer can improve the mass distribution of the rotor relative to the axis, so that the vibration generated when the rotor rotates or the vibration force acting on the bearing is reduced to the allowable range.
Therefore, the balancing machine is an indispensable device for reducing vibration, improving performance and improving quality. Generally, the balance of the rotor includes two steps of measuring and correcting the unbalance amount, and the balancing machine is mainly used for measuring the unbalance amount, and manually correcting the hand. The method is completed. Some balancing machines have made the calibration device a part of the balancing machine. The gravity balancing machine and the centrifugal balancing machine are two types of typical balancing machines. The gravity balancing machine is generally called a static balancing machine, which is dependent on the rotor. The gravity is used to measure the static imbalance. The gravity balancer is only suitable for some disc-shaped parts with low balance requirements. For the rotor with high balance requirements, the centrifugal single-sided or double-sided balance machine is generally used. The balance machine measures the imbalance according to the support vibration caused by the rotor imbalance or the vibration force acting on the support in the state where the rotor rotates. According to the difference of the number of correction planes, it can be divided into a single-sided balance machine and double-sided balance. machine.
The single-sided balancing machine can only measure the imbalance on one plane (static imbalance). Although it is measured while the rotor is rotating, it still belongs to the static balance machine. The double-sided balancing machine can measure the dynamic imbalance, and can also measure the static imbalance and the even imbalance, which are generally called dynamic balancing machines. The centrifugal force balancing machine can be divided into a soft bearing balancing machine and a hard bearing balancing machine according to different bearing characteristics. The balance speed is higher than the natural frequency of the rotor-support system. This is called a soft-bearing balancer. The balance of the balance is small, and the signal detected by the sensor is proportional to the vibration displacement of the support. The balance speed is lower than the natural frequency of the rotor-support system. This is called a hard-bearing balancer. The balance of the balancer is large, and the signal detected by the sensor is proportional to the vibration force of the support.
