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What are the most common measuring methods for balancing machines? 3 methods in detail
A balancing machine (dynamic balancing machine) is a type. A testing instrument for measuring the size and position of unbalance of a rotating workpiece (rotor). The main performance of the balancing machine is to use two comprehensive indicators of the minimum reachable remaining unbalance and the reduction rate of the balancing machine. The former is the minimum value of the remaining unbalance that the balancing machine can make the rotor reach. It is an indicator to measure the highest balancing ability of the balancing machine; The ratio is the ratio of the reduced unbalance after one correction to the initial unbalance.
At present, the widely used measurement methods of balancing machines on the market mainly include loop belt drive, self-drive, and universal joint drive. So how are they defined and what are their advantages and disadvantages? Today, Zhuo Xuanjin editor will take you to understand~
Loop belt drive is a kind of high precision driving method of balancing machine. The rubber rotor belt or silk endless belt of the balancing machine is driven by the motor pulley to measure the rotation of the rotor. Therefore, the loop belt drive requires that the surface of the measurement rotor must have a smooth cylinder surface.
The advantages of the belt drive: it does not affect the measurement of the unbalance of the rotor, the dynamic balance accuracy is high, and the operation is simple.
Disadvantages of the belt drive: the measuring rotor must have a smooth cylindrical surface.
Self-driving technology is to use the rotor's own power to rotate. Self-driving is the driving method that has the least impact on the balance accuracy. The balance accuracy can reach the highest, but only the special rotors allowed by the structure can use this driving method.
The advantages of self-driving: simulating the actual operating state for measurement, high balance accuracy, and eliminating the secondary balance error generated by component assembly.
Disadvantages of self-driving: Only special workpieces whose structure allows can use this driving method.
Universal joint drive
The principle of the universal joint drive is that the balancing machine is connected to the rotor through the main shaft and can transmit a large torque. It is suitable for driving rotors with large wind resistance such as fan impellers, but the imbalance of the universal joint itself will affect the measurement rotor and interfere with the balance accuracy (so the universal joint must be balanced and corrected before use). A large number of connecting discs are suitable for different types of rotors.
Dynamic advantages of universal joint drive: suitable for rotors with irregular appearance and large torque transmission.
Disadvantages of the universal joint drive: the unbalance of the universal joint itself will affect the balance of the rotor and interfere with the accuracy of the balance. In addition, a large number of connecting discs must be made to adapt to different types of rotors, and the measurement accuracy is low.