Rotary joints for machine tool renovation and improvement

In the process of machine tool transformation and performance upgrade, the rotary union, as a key sealing device connecting the fixed fluid source and rotating components, directly determines the cooling efficiency, machining accuracy, and equipment life through its selection and application

Product Features
High pressure and high-speed hydraulic oil clearance sealing rotary joint
Product Features:
Supported by two wide and high-precision bearings, the operation is smooth and the bearings do not require maintenance for life;
High speed and high-pressure sealing structure, no contact wear of sealing rings, ensuring long-term trouble free operation of the product;
Lower rotational torque;
Adopting a special product structure, there is no frictional heat generated during high-speed operation;
The rotational torque is not affected by working pressure and temperature;
The working range of the speed is wide, and it can reach up to 6500 RPM at high speeds;
Drain hole design to prevent leakage to the external environment;
Being able to tailor products to meet the needs of customers;
Technical parameters:
High speed: 6500 r/min
Temperature range: -30 to+80 ℃
High pressure: 30Mpa
Working medium: hydraulic oil and other fluid media
Important note:
The K series products adopt a gap sealing structure, and the discharge hole L must be connected to the return oil tank using an oil pipe during installation, and the return oil pipeline must not be blocked to form pressure;
2. There is mutual leakage in the internal channels, and attention should be paid to the compatibility of different fluids to prevent cross contamination;
3. High precision connectors should be used after filtering the working fluid, with a filtration accuracy of not less than 10 μ m;
4. The increase in temperature will reduce the viscosity of hydraulic oil, causing an increase in internal leakage. A cooling device is required during use;
5. The hydraulic system needs to have an automatic pressure regulator to compensate for pressure loss caused by internal leakage in the joints
When using the expansion and contraction cylinder rotary joint, the rotating core shaft can rotate inside the rotary joint housing through the rear end bearing and the front end bearing, and the liquid can be discharged from the inlet hole of the rotating core shaft, the flow groove and outlet hole inside the rotary joint housing. There are shaft rotary sealing rings on the inner hole walls of the rotary joint housing on both sides of the flow groove, which can greatly increase the sealing performance.
The dynamic characteristics of non-contact gap sealed rotary joints. Method: A system dynamics equation considering nonlinear oil film force, rotor rotational motion, and floating ring vibration is established for a typical gap sealed rotary joint. Numerical simulation is used to analyze the effects of oil film gap, speed, seal ring stiffness, and other factors on the motion of the rotor and floating ring. The larger the gap, the greater the amplitude of rotor motion, and the greater the relative displacement between the rotor and the floating ring; As the speed increases, the amplitude of the rotor and floating ring motion first increases and then decreases; As the stiffness of the sealing ring increases, the motion amplitude of the rotor and floating ring first increases and then decreases. The established dynamic model can be used to analyze the dynamic characteristics of non-contact gap sealed rotary joints, providing a theoretical method for the design of rotary joints.