Rotary unions are joints designed to connect stationary and rotating equipment. If we see spindle applications, then these joints allow the connection of coolant tubes. They are interlocked with the internals of rotating unions. In the union, the drawbar of the shaft rotates and allows the flow of coolant to the machined operation.
Certain environments have relatively harsh environments. For example, in a hydraulic system, hydraulic rotary unions operate in harsh conditions, and they run for long hours.
Here are some common issues in rotary joints and their resolution.
Fluid Leakage
Leakage of fluid may happen due to multiple reasons. One is because of wear or damage in gaskets and seals. It may happen due to misalignment as well. You should replace components that show symptoms of deterioration.
Another reason may be improperly tightened connections. It will prevent leaks.
You should check the compatibility of the fluid as well. If the fluid is not compatible, then it causes leakage in the rotary joint. Incompatibility may cause the degradation of seals and fluid leakage.
Interruptions in signals
It may predominantly happen due to problems with electrical connections. Check whether the connection is secure or not. Also, check if it is corrosion free. To resolve these issues, you need to replace or clean the connectors.
Another reason for the interruption in signal is the wear of rings and brushes. You should clean them to correct the problem.
Check the wiring for any breaks or loose connection. The wiring has to be replaced in this case.
Excessive wear
To troubleshoot the problem of excessive wear, you need to check the surfaces of the bearings. If there are any signs of deterioration, then you should replace them.
Excessive wear can also happen due to improper lubrication. Improper or insufficient lubrication may cause damage to the rotating surfaces. It is important to follow the recommendations for lubrication intervals suggested by manufacturers.
Noise in operation
One major cause of noise in operation is due to worn or damaged bearings. You should replace them if necessary.
Another reason may be misaligned rotary joints. It may cause high noise and high friction.
Reduced speed of rotation
You should first check the binding. Is there any obstruction? Is there anything impeding the rotation? You should clear any debris.
Lubrication issues can also lead to increased friction and reduced speed of rotation. You should check the functioning of the lubrication system also.
Temperature problems
Overheating is one of the major temperature problems. It may happen because of high friction or an inadequate cooling system.
You should also check the operating conditions. If the rotary joints do not operate within the specified range of temperatures, then it can affect the performance.
Continuous monitoring of rotary joints will keep them in good health. Regular troubleshooting will reduce common issues and improve efficiency.
It is important to refer to the guidelines and specifications given by the manufacturer about the maintenance and troubleshooting of rotary unions. When these issues persist or you are not sure about the diagnosis of the problem, you should consult with either the manufacturer or any qualified technician for further assistance.
Also Read: How to Choose the Right Rotary Joint for Your Needs?