THE ROTARY JOINT, A KEY ELEMENT IN ELECTROMANDRINES.



The rotary joint that some electrospindles have has a very strict preventive maintenance. This type of gasket is carried by engines such as the one we are going to see in this article. It is a FRANZ KESSLER brand electrospindle, specifically the DMO112.AM.4.AFS-C4 model. These teams are usually mounted on Chiron brand metal machining centers.To get more news about rotary joint, you can visit grandslipring.com official website.

These motors are usually mounted vertically inside machining centers. The rotary joint is mounted on the upper part of the electrospindle, depending on its working position. Its mission is to provide through it the cooling water of the tool. And it has a specific number of hours of use, which if we do not take into account through preventive maintenance of this joint, we will cause the failure and this will result in the entry of water into the electrospindle. This is the most typical breakdown in this type of engine. If the maintenance of the rotary union is not carried out at the appropriate working hours, we will have the failure assured.

In the image of the previous point, we can see a blue capsule in the center of the electrospindle. This is the rotary joint. It is made up of two pieces, in the image on the right we have them disassembled and we see how they are clearly damaged by rust. Now we will describe how this situation has come about.

Let’s first understand how this board works. In the image on the right we see two pieces, the blue piece is fixed and fastened to the electrospindle casing, while the lower piece is integral with the rotor shaft. Both pieces come into contact through a graphite gasket closure (we see them assembled in the image on the left).

The fixed part has a spring that, when the pressure enters, pushes and makes the two graphite faces come into contact. Specifically, they are the one that is mounted on the fixed part and the one that is integral with the rotor that is in permanent rotation. On the other hand, the water would pass through the interior of the two pieces, but it would not come out due to the action of the graphite gasket. When the pressure disappears, it returns backwards due to the effect of the spring and the two pieces are separated, since if they rubbed against each other dry they would be damaged.

Filtration of the cooling liquid.
JUNTA ROTATIVAThe cooling liquid that is the one that passes through the joint must be clean and without traces of metal chips or remains of the work of the tool. It must also work at the pressure indicated by the manufacturer for the spring to act correctly.

This cooling liquid must have the characteristics indicated by the manufacturer and the filtering system must guarantee its quality. If filtering fails, the liquid will drag chips and problems begin. Metal remains can be deposited on the graphite faces and prevent total sealing, allowing liquid to pass into the electrospindle.

We see in the image how the remains of chips have a great presence on the outside of the engine. The coolant recirculation system can drag these metal remains as a result of the work of the tool and if the filtering is deficient, the problem will begin.