Hydraulic rotary joints are commonly used in hydraulic systems in industries such as metallurgy, robotics, machine tool fixtures, automation, wind power, and construction machinery. Their characteristic is that hydraulic oil transmits a large torque through a certain pressure. Such high-pressure rotary joints can reach a maximum pressure of 45 MPa.
During the use of hydraulic rotary joints, the most concerning issue is leakage, which prevents pressure maintenance and leads to equipment malfunction. Based on analysis of application data from a large number of samples over the past 20 years, the company's R&D and after-sales teams have concluded that wear of the sealing rings and sealing surfaces of hydraulic rotary joints contributes significantly to oil leakage.
The daily maintenance of hydraulic rotary joints requires special attention to key aspects such as lubrication, cleaning, coaxiality, and foreign matter prevention. Specific measures are as follows:
Lubrication maintenance
Regularly inspect and replenish lubricating grease to ensure smooth operation of the bearings. Most rotary joints require regular oiling (such as once every 3-6 months) to prevent accelerated wear due to dry friction caused by insufficient lubrication.
Cleaning management
Keep the interior of the drum and pipeline clean to prevent impurities from entering the sealing surface and causing scratches. New equipment should be installed with filters, while old equipment should have its oil circuit regularly cleaned of impurities to prevent foreign objects from damaging the sealing surface.
Coaxiality inspection
Ensure that the coaxiality deviation between the equipment and the rotary joint is less than 0.5mm to avoid accelerated wear due to uneven eccentric force. During installation, the axis needs to be calibrated, and violent vibration should be avoided during use.
Measures to prevent foreign objects
Handle with care during transportation, and strictly avoid collisions that may cause components to fall off; when not in use for a long period, regularly oil the components to prevent rust and avoid internal scaling and seizure.
temperature control
The rotary joint of the circulating heat medium should be heated slowly to avoid sudden temperature changes that may cause aging of the sealing material or structural deformation.
Wear monitoring
Regularly inspect the wear condition of the sealing surface (normal wear ≤10mm), and replace it immediately if scratches or three discontinuous points are found