Since the rotor during the manufacturing process and the assembly process, the final assembled rotor cannot always be completely symmetrical on the power shaft (referred to as an eccentric shaft) and, therefore, there is a certain amount of imbalance. This imbalance is often referred to as the original unbalance.
There are a number of reasons why the rotor has a raw unbalance, but if the rotor is unbalanced, the rotor's unbalance will produce a centrifugal force when the rotor rotates. The centrifugal force gradually increases with increasing speed. Centrifugal force through the bearing to convey to the machine, causing the whole machine vibration, noise, speed bearing wear, reduce the life of the machine, and even machine control failure, a serious accident.
Dynamic unbalance is the most commonunbalances,it is a combination of static unbalance and the coupleunbalance. Unbalanced rotor after the dynamic balance correction, not only eliminates the even imbalance, but also eliminates the static imbalance, then the rotor center inertial spindle and the rotation axis is completely consistent, so that the rotor to achieve balance. But the ideal is full of the reality is the sense of bone, want to balance an unbalanced rotor to the unbalanced amount of zero, it is impossible. Because of the accuracy of the dynamic balancing equipment and the limitations of the rotor. Therefore, there is a balance of precision concept, that is, under the existing conditions, we can achieve the most reasonable of a numerical order, so that meet the requirements of production and life, but also to meet the economic requirements.
Under what circumstances to balance the balance In the assembly process, the gap between the accessories are in line with the installation standards but for the entire rotor, its cumulative error may exceed the rotor dynamic balance accuracy. Especially for some of the bearing with the bottom of the bearing parts, but should be in the assembly before the dynamic balance check.
Precision requirements for dynamic balancing machines The minimum achievable residual unbalance is the minimum residual unbalance can be achieved is balance machines the highest performance index. Hard bearing balance machine can be expressed directly with a minimum of surface residual unbalance correction, in units of (g / mm), some are also used g / cm. The minimum reachable residual imbalance is affected by factors such as the type of the balancing machine, the measurement mode, the transmission mode, the bearing form and the plane separation ratio of the calibration plane and the sensitivity of the balancing machine.
For high precision balance of the rotor (i.e., the residual unbalance is small), we should try to eliminate the imbalance factors affecting accuracy. The influence factors of the balancing machine and the transmission of the imbalance of the largest impact. Rotor journal accuracy should also be strictly limited, as well as with the impeller rotor parts, the center of gravity is not the rotor, bearing the bottom of the bearing and seal the use of packing rotor.
Automatic balance rotor -Rotorbalance process andmovable For the initial unbalance is very large, when the rotation is too large vibration of the rotor, before the dynamic balance check first single-sided balance to eliminate static imbalance. Sometimes, because of the position of the front of school choice (within the school that is not focusing on positive selection) improper, after adjustment for static balance but will make the couple unbalance increases. Thus, positive correction is preferably selected for the center of gravity lies in a plane, in order to reduce couple unbalance.
If the plane of gravity is not allowed to be heavy, it should normally be carried out on two planes on either side of the plane where the center of gravity is located. In order to reduce the time and labor spent balance operation, we should try to reduce the amount of correction, where possible, for this condition, after the dynamic balance measurement rotor balancing, the rotor can be increased for the method according to required weight and The method of balancing the rotor processing: The so-called emphasis method, that is, in the opposite direction of the imbalance with the correction of heavy blocks. To the weight method is to remove a certain weight in the direction of unbalanced, commonly used methods are: boring, drilling, cutting, milling, grinding and so on.
JP Balancing Machine’s rotor automatic balancing machine rotor imbalance can solve the problem, a balancing weight to the processing method, the correction can balance maximum weight 0.5 kg, a rotor diameter of 40 mm. As a professional manufacturer, JP Balancing Machine also manufacture various types of rotor balance machines, the rotor better balance effect.