light industry

一、Introduction of dynamic balancing machine
A component that rotates around an axis in a machine, called a machine. If the quality of a rotor is evenly distributed, manufactured and installed, the operation is smooth, the pressure on the bearing, only the static pressure, which we call the balance of the rotor. On the contrary, if the rotor due to uneven quality, improper installation, resulting in the center of the principal axis of inertia and the rotation axis is not coincident with the rotation of the bearing and the dynamic pressure, we call the unbalanced rotor. Constraints for the axis of rotation of the unbalanced rotor, dynamic unbalance on bearing caused by dynamic pressure, also known as dynamic load, it will not only caused by the rotating machinery vibration, noise, increased energy consumption, will accelerate bearing wear, resulting in rotor high frequency fatigue damage and supporting box and some parts of forced vibration damage, reduce the life of rotating machinery, can lead to serious accidents. Since these imbalances occur when the rotor rotates, it is generally required to measure the rotation, and then the correction, so called dynamic balance.

How to balance the dynamic balance, to a large extent by the accuracy of the measurement system constraints. From the principle, the measurement system can be divided into the soft supporting dynamic balancing machine and the hard bearing dynamic balancing machine. Soft bearing balancing machine first appeared in the late 1950s to the early 1960s, is still widely used, especially in the ultra high-speed, high precision, small rotor and mass, such as crankshaft, balance and in automatic dynamic balancing machine field still use soft bearing dynamic balancing machine. Hard bearing dynamic balancing machine is a kind of widely used since the early 1970s with the rapid development of general dynamic balancing machine, because of its calibration and rotor m (quality) and I (inertia) has nothing to do, therefore only need to a calibration (and soft bearing dynamic balancing machine calibration coefficient with the rotor M and I vary, so for different types of rotor and need to one re calibration). In recent years, due to the continuous improvement of the hard bearing dynamic balancing machine structure, the electric measuring system is also becoming more and more perfect, the balance precision is improved and the versatility is strong, so the hard bearing dynamic balancing machine has become the mainstream of the dynamic balance machine.

二、Introduction to system principle and scheme
The system of dynamic balancing machine mainly consists of motor, mechanical vibration system, control system (frequency converter), electric measuring box and so on. System by Yi Chong Fei converter ECF500 adjusting the motor speed to achieve the workpiece needed to balance speed, according to the characteristics of AC motor speed, motor is selected in the P and s for fixed value, proportional to motor speed n and the power supply frequency of f into and through the inverter change motor driving power supply frequency, to achieve the motor frequency conversion of stepless speed regulation. Since the frequency conversion function is complete, the parking time can be set through the inverter inverter, so that the motor immediately stop.
Motor rotation through a driving belt drives the balancing machine spindle, spindle and the workpiece is connected to rotate together, due to the uneven workpiece itself, rotating vibration through the sensor will mechanical signals into electrical signals and input power measuring box, the electric measurement box operation treatment, then by the display shows the amplitude and phase of unbalance of the workpiece.
Yi Chuang Fei ECF500 series inverter is the leading industry of the V / F control mode, low harmonic output, super torque adaptive, in dynamic balancing machine equipment good adaptability, excellent performance.

三、 ECF500 converter main parameter setting
(1) frequency setting: the maximum frequency E-09 is set to 120Hz, in order to apply different parts of the balance speed, by adjusting the motor speed, to achieve the requirements of the workpiece. Usually set 50-100Hz, that is, the maximum speed limit of the motor in 3000rpm, to prevent the workpiece balance when the speed is too high, resulting in some parts of the balance machine parts damaged and other issues, and even cause damage to the accident.
(2), plus deceleration time setting: after the start of the inverter, a reasonable set of acceleration and deceleration time, the acceleration process of the output current, if the output current is too large, then the acceleration time is prolonged, and vice versa. After stopping the operation of the inverter, the deceleration process is observed whether the DC overvoltage occurs, if there is an extension of the deceleration time, otherwise it can shorten the deceleration time.
(3), brake (brake) set: by the inverter on the motor to play the role of DC braking. According to the field condition, the suitable DC braking voltage and DC brake starting frequency are set.

四、Operation and operation
Inverter is put into operation, can automatically stable workpiece needed to balance speed and simple operation but must comply with the following provisions: (1), before the start, between the workpiece and fixture checked and electric control box and the inverter control circuit wiring, security frame (safety cover) whether cover, in order to avoid failure.
(2) power supply, set the appropriate maximum frequency parameters and acceleration and deceleration time.
(3), start: the inverter control panel "FWD" press the motor to run.
(4) parking: the inverter control panel "STOP" press the motor can be stopped.
(5), protection of full-featured, when a fault occurs, inverter automatically jump interpretation, and the fault self diagnosis function, reduce operator repeated labor.

五、Concluding remarks
ECF500 series inverter in the balance of the application, the control circuit structure is simple, stable and reliable, easy to debug, the advantages of less fault, etc.. At the same time, it can reduce the transmission mechanism and control mechanism of the mechanical system, make the system more convenient and more efficient. In dynamic balancing machine industry David chuangfei inverter customers get a good reputation and brand recognition.