⊙ what needs balance correction? Why do ⊙ have the problem of imbalance? Why would ⊙ do the balancing correction? ⊙ are the types of poor balance? ⊙ what are the characteristics of poor balance? How do ⊙ quantify poor balance? where is the standard of ⊙ balance? How do ⊙ carry out balance correction? What needs to be balanced All rotating parts require balance correction, including: ⊙ appliances: washing machine, fan, ceiling fan, etc. ⊙ vehicles: tyres, propellers, etc. ⊙ machinery tools: grinding wheel, grinder, polishing machine, etc. ⊙ machinery and equipment: blower, motor, pump, etc. Why is there an imbalance The definition of poor balance: when the rotating parts inertia axis line and rotation axis line is not always on line, this rotating parts are bad balance. The causes of the imbalance in the rotating parts are: the rotating parts are not symmetrical in shape tolerances in processing and manufacturing assembly and improper installation Deformation of rotating parts during operation Rust, breakage and wear of rotating parts Attach dust and foreign body rotating parts Why balance correction When the inertial axis line of the rotating part is not in line with the rotating axis line, the centrifugal force is produced with the rotation of the rotating part. When the rotational speed is higher or the inertial axis line deviates from the rotating axis line more (that is, the balance condition is worse), the centrifugal force is larger, and the vibration of the rotating part or equipment will become larger. Benefits of implementing balance correction ☆ reduce vibration and noise ☆ a safe and comfortable environment ☆ Enhance Product Quality ☆ extend the life of equipment and components ☆ Reduction of Equipment Structural Stress ☆ reduce energy loss ☆ Avoid safety problems Effects of poor balance on machinery and equipment noise and vibration bearings susceptible to high temperatures and damage mechanical shaft seal life reduced coupling life reduced foundation loose deformation Forced damage equipment structure Lubricating oil leakage What are the types of poor balance static imbalance (Static Unbalance) even imbalance (Couple Unbalance) semi-static imbalance (Quasi-Static Unbalance) imbalances (Dynamic Unbalance) Static imbalance (Static Unbalance) A static imbalance is sometimes referred to as Force Unbalance, mainly occurs on a narrow disk-shaped rotating part. It is usually eliminated by placing an equal and uneven counterweight at the center of mass. Even unbalanced (Couple Unbalance) Even disequilibrium is sometimes also called Moment Unbalance, its inertial axis line intersects with the rotating axis line at the center of mass, at which time the correction plane must have two. Half - static imbalance (Quasi-Static Unbalance) The characteristics of semi-static imbalance are that the inertial axis line has an intersection point with the rotating axis line, but it does not intersect with the mass center. Movement imbalance (Dynamic Unbalance) The characteristic of dynamic imbalance is that there is no intersection point between the inertial axis line and the rotating axis line, and most of the unbalanced parts (bodies) belong to this type. What are the characteristics of poor balance When the rotating parts with poor balance are in operation, additional centrifugal force will be generated due to the imbalance, resulting in vibration at the position of the supporting point (bearing). The mode of operation is as follows: Vibration characteristics of poor balance It is not difficult to find the vibration characteristics caused by poor balance if we analyze and think from the operation mode of unbalanced rotating parts: 1. frequency of one of the frequencies has obvious amplitude. 2. no other apparent frequency doubling of rotational speed occurs. 3. radial double frequency vibration is much larger than axial vibration. 4. phase angle of the same measurement point must be quite stable.