How to judge whether the coupling is aligned
Judging whether the coupling is aligned is a process involving multiple steps and tools. Here are some common judgment methods:
1. Visual inspection
First, you can visually check the appearance and installation of the coupling to preliminarily judge whether there is obvious misalignment, such as coupling deflection, bearing heating, vibration, etc.
2. Measurement and calculation
In order to more accurately judge whether the coupling is aligned, measurement and calculation are required. Commonly used measuring tools include rulers, feeler gauges, micrometers, dial indicators, and laser alignment instruments.
Ruler and feeler gauge measurement method:
Use a ruler to measure the radial displacement of both ends of the coupling (that is, the deviation of the two axes in the horizontal or vertical direction).
Use a feeler gauge to measure the non-parallelism of the coupling end faces (that is, the gap between the two shaft end faces).
This method is simple but not very accurate, and is suitable for machines with low speed and low precision requirements.
Dial indicator measurement method:
Install the dial indicator on the reference shaft and measure the value of the outer circle or end face of the coupling.
Calculate and analyze the measured values to determine the positional relationship between the two axes in space.
This method is widely used, but attention should be paid to the influence of axial movement on the measurement reading.
Dial indicator measurement method:
The dial indicator measurement method has high accuracy. Commonly used methods include single-meter measurement method, double-meter measurement method, three-meter measurement method and five-meter measurement method.
Install the dial indicator on the meter stand to measure the radial displacement and axial displacement of the coupling.
By analyzing the readings on the dial indicator, the adjustment amount can be obtained to determine the alignment of the coupling.
Laser alignment instrument measurement method:
The laser alignment instrument uses the position change of the laser beam on the sensor to calculate the alignment of the machine.
This method is fast, accurate, and easy to operate. It is suitable for machines with high precision requirements.
3. Judgment standard
After the measurement is completed, it is necessary to judge whether the alignment of the coupling is qualified according to the specific requirements and specifications of the equipment. Generally speaking, the radial displacement and axial displacement of the coupling should be controlled within a certain allowable range.
4. Precautions
Before measuring, it is necessary to ensure that the equipment is in a stable state to avoid errors during the measurement process.
The measuring tool should use products with high precision and operate in accordance with the specifications.
The measurement results need to be reviewed multiple times to ensure accuracy.
For complex machinery and equipment, it may be necessary to combine multiple methods for comprehensive judgment.
