How can you prevent the grinding wheel from bursting during metal processing?
Grinding motors with overspeed shutdown function increase operator safety by reducing the risk of accidents.
High power pneumatic grinding motors; It is widely used in metalworking industries such as foundries, shipyards and heavy machinery production shops. We know that the most important thing in these industries is safety. The overspeed shut-off function, a feature available on select high-power pneumatic grinders, greatly reduces the risk of accidental overspeeding of the grinding wheel. This feature is of great importance as an overspeed incident can lead to a disc explosion that could cause injuries that may result in the death of the operator.
Powerful pneumatic grinders have a regulator that regulates air intake as a function of speed. When the speed increases, this input becomes smaller so that the speed does not exceed the maximum limit defined for the tool.
This mechanism was developed to work at a certain air pressure; If the air pressure increases significantly, the speed becomes too high. This is where overspeed protection comes into play. See overspeed protection in action:
At the correct pressure, air passes through the air inlet and goes to the exhaust through the engine without the intervention of the closing mechanism. In this way, the device can operate at full performance.
If the pressure increases significantly and the disk speed significantly exceeds the maximum speed defined for the tool, centrifugal force releases a steel ball that blocks air entry. In this way, the air flow is closed and the tool stops. This process occurs instantaneously, in less than a second, before the grinding wheel reaches a speed at which it can explode and fragments can fly towards the operator or someone else.
IMPORTANT: You must perform maintenance before you can start the tool again; The steel ball must be removed from the airflow path and returned to its original position. Activation of the shutdown function usually indicates an airflow abnormality. Therefore, we strongly recommend that you perform an air line check and investigate the root cause that led to the shutdown.