Balancing Machine Is The Machine That Measures The Size And Position Of The Rotating Object Unbalance
Balancing machine is used to determine the rotor imbalance of the instrument, the balance machine is a hard bearing balancing machine, swing frame stiffness is very large, with the dynamic balancing machine measurement results of the rotor unbalance to correct the rotor rotation caused by vibration or The vibration on the bearing is reduced to the allowable range to achieve the purpose of reducing vibration, improving performance and improving the quality of the product, and increasing the size of the unbalance by using the emphasis or de-weighting.
The balancing machine is a machine that measures the size and position of rotating objects (rotor) unbalanced, and is a professional design and manufacture of universal type, special type two series of nearly 100 varieties of dynamic balancing machine.
When any of the rotors rotates around its axis, the centrifugal force is generated due to the uneven distribution of the mass distribution relative to the axis. This unbalanced centrifugal force acts on the rotor bearings to cause vibration, noise and accelerated bearing wear, which seriously affects the performance and longevity of the product. Rotary parts such as motor rotor, machine tool spindle, internal combustion engine crankshaft, steam turbine rotor, gyro rotor and watch wheel and so on are all need to be balanced to run normally.
The correction of the unbalance of the rotor is made according to the data measured by the balancing machine to improve the mass distribution of the rotor relative to the axis so that the vibration generated during the rotation of the rotor or the vibration force acting on the bearing is reduced to within the allowable range. Therefore, the balancing machine is an indispensable device for reducing vibration, improving performance and improving quality.
Typically, the balance of the rotor includes two steps of measurement and correction of the unbalance, which is mainly used for the measurement of unbalance, and the correction of the unbalance is often done by means of other auxiliary equipment such as drilling machines, milling machines and spot welding machines, Method to complete the increase and weight, to achieve the elimination of unbalanced. Some balancing machines have made the calibration device a part of the balancing machine.
Gravity Balancing Machines and Centrifugal Balancing Machines are two typical balancing machines. Gravity balancing machines are commonly known as static balancing machines. It is dependent on the rotor's own gravity to measure static imbalance.
If the rotor on the two horizontal rails is unbalanced, its heavy moment on the axis causes the rotor to roll on the rail until the unbalance is at its lowest position.
The equilibrated rotor is placed on a bearing supported by a hydrostatic bearing and a mirror is fitted underneath the support. When there is no imbalance in the rotor, the light beam emitted by the light source is reflected by the reflector and projected onto the polar coordinate origin of the unbalance indicator. If there is an unbalance in the rotor, the rotor bearing is tilted under the weight of the unbalanced moment, and the mirror under the bearing is tilted and the reflected beam is deflected so that the light beam shines on the polar coordinate indicator Point will leave the origin. Depending on the coordinate position of the spot deflection, the size and position of the unbalance amount can be obtained.
The gravure balancer is only suitable for certain discoid parts with low balance requirements. For the high balance of the rotor, the general use of centrifugal single-sided or double-sided balancing machine.
The centrifugal balancing machine measures unbalance in the state of rotation of the rotor, depending on the bearing vibration caused by the unbalance of the rotor, or the vibration force acting on the support. According to the number of correction plane, can be divided into single-sided balancing machine and double-sided balancing machine. A single-sided balancing machine can only measure a plane imbalance (static imbalance), although it is measured in the rotor rotation, but still static balance machine. Double-sided balance function measurement dynamic imbalance, can also be measured static imbalance and even imbalance, commonly known as dynamic balancing machine.
Centrifugal force balancing machine according to the bearing characteristics of different, can be divided into soft bearing balancing machine and hard bearing balancing machine. The balance speed is higher than the natural frequency of the rotor-bearing system known as the soft-bearing balancing machine. The stiffness of the balancing machine is small and the signal detected by the sensor is proportional to the displacement of the support. The balance speed is lower than the natural frequency of the rotor-bearing system. It is called the hard bearing balancing machine. The balance of the balancing machine is large, and the signal detected by the sensor is proportional to the vibration force.
The main performance of the balancing machine is expressed as the minimum achievable residual unbalance, and the unbalanced reduction rate. The former is the minimum value of the balance of the remaining unbalance of the rotor, which is the measure of the balance of the balance machine. The latter is the ratio of the unbalanced reduction and the initial unbalance after a correction. It is a measure of the balance efficiency Of the indicators, generally expressed as a percentage.
In modern machinery, due to the extensive application of flexible rotor, people developed a flexible rotor balancing machine. This type of balancing machine must be in the rotor operating speed range of stepless speed regulation; in addition to measuring the support of vibration or vibration, but also to measure the rotor deflection. The flexible rotor balancer is sometimes installed in a vacuum guard chamber to accommodate the balance of a rotor such as a turbine, which is equipped with a large auxiliary equipment such as a vacuum system, a lubrication system, a lubricating oil degassing system and a data processing computer system.
According to the needs of mass production, the specific rotor can automatically complete the balance measurement and balance calibration of the automatic balancing machine, as well as balance the automatic line, modern has a large number of equipment in the automobile manufacturing, electrical manufacturing and other industrial sectors.