Impeller Dynamic Balancing Correction
Large and medium-sized impeller has been conventional practices that are all through the static state to find a balance. Due to the relatively low speed rotation, the influence of the impeller balance is not prominent. The higher the impeller speed, the greater the centrifugal force produced by the unbalance. In the static state, balance correction can eliminate static imbalance. It can be balanced in the static, but cannot eliminate the rotating coupe imbalance. Coupe imbalance can only be determined in the impeller rotation state. To effectively remove the impeller unbalance, it is necessary to change the balance circumstance, select the appropriate balancing equipment and balance process.
Large and medium-sized impellers have large weight and rotary diameter. It is suitable for selection of universal horizontal hard bearing balancing machine. The machine has a variety of support. In the provisions of the equilibrium mass range and speed range, it can balance a variety of impellers, single, double, multi-plane balance correction. The rotation of Impeller has resistance caused by a large number of leaves, coupled with most of the impeller is welding parts, errors will lead to impeller initial imbalance. Therefore, we should choose a balance machine that is twice as large as the maximum work piece weight. This balancing machine drive power, two bearing pendulum support rigidity, and electrical components seismic capacity can be more suitable for impeller balance demand. Such a balancing machine can prepare for new product research and development.
By calculating the impeller unbalance, it is necessary to check whether the accuracy of the balancing machine can reach the impeller balance. The balancing machine has two important performance indicators: minimum reachable residual imbalance and unbalance reduction rate. The minimum achievable residual imbalance is the measure of highest balance performance, reflecting the balance can achieve the minimum amount of residual unbalance. The unbalanced reduction rate is the ratio of the unbalance to the initial unbalance, which is a measure of the efficiency of the balancer.
Most of the impellers are welded parts, and the welding error can result in considerable initial unbalance. Unbalanced impeller act as too larger force in the balance machine on the rotation, so that the supporting frame produces excessive amplitude vibration. First, Impeller should do static balance correction, to eliminate large imbalance. Disconnect the transmission mechanism of balance machine for impeller static balance correction. Then use the dynamic balancing machine to do low-speed double-sided dynamic balance correction. In low speed, centrifugal force will be in corresponding reduction, safety increases. Finally double-sided dynamic balance correction with normal balance speed. Check the impeller residual unbalance, we must take into account the universal joint, balance tooling to bring greater error. The final measured minimum balance should be less than 1/3 or 1/2 of the allowable unbalance.
We will provide the corresponding balancing machine operating procedures. From the security point of view, for the balance machine performance, parameters, balance technology and other characteristics, to detail preparation of the impeller balance the entire process of operation methods, precautions and balancing machine maintenance, the initial balance of the impeller speed, the normal balance of the minimum unbalance Value table, used to guide the balance operation.