Low pressure casting machine is generally called static low pressure casting machine. It relies on the gravity of the rotor itself to measure the static unbalance. It measures the static unbalance by the gravity of the rotor itself. The gravitational moment on the shaft causes the rotor to roll on the rails until the imbalance reaches a low position.
The balance rotor is placed on the bracket supported by the hydrostatic bearing, and the rearview mirror is embedded under the bracket. When the rotor is not unbalanced, the light beam emitted by the light source is reflected by the reflector and projected to the polar coordinate origin of the unbalance indicator. When the rotor When there is an imbalance, the rotor bracket will tilt due to the unbalanced gravity moment, the mirror under the bracket will also tilt, the reflected beam will be deflected, and the beam spot projected on the polar coordinate display will leave the origin. According to the coordinates of the spot deflection position, the size and position of the unbalanced quantity can be obtained.
By correcting the unbalance of the rotor according to the data measured by the low-pressure casting machine, the mass distribution of the rotor relative to the axis can be improved, and the vibration generated when the rotor rotates and the vibration force acting on the bearing are reduced to the allowable range. Therefore , Low pressure casting machine is the necessary equipment to reduce vibration, improve performance and quality.
The balance of the rotor usually includes two steps: the measurement and correction of the unbalance. The low-pressure casting machine is mainly used for the measurement of the unbalance, and the correction of the unbalance is mostly done by drilling machines, milling machines, spot welding machines and other auxiliary equipment or manually. Some low-pressure The casting machine uses a correction device as part of the low pressure casting machine.
Low-pressure casting machines are only suitable for disc parts that do not require balance. For rotors with high balance requirements, centrifugal single-sided or double-sided low-pressure casting machines are generally used.
The centrifugal low-pressure casting machine measures the unbalance amount according to the vibration of the bracket caused by the imbalance of the rotor or the vibration force acting on the bracket when the rotor rotates. According to the number of calibration planes, it can be divided into single-sided low-pressure casting machine and double-sided low-pressure casting machine. Single-sided low-pressure casting machine The two-sided low-pressure casting machine can only measure the unbalance (static unbalance) on one plane, and it is a static low-pressure casting machine when the rotor rotates. The double-sided low-pressure casting function can measure dynamic unbalance, static unbalance or even unbalance, commonly known as dynamic low-pressure casting machine.
