A Hydraulic Rotary Union is a mechanical device that allows the transfer of hydraulic fluids between stationary and rotating components in machinery. It differs from standard rotary unions by being specifically designed to handle hydraulic systems, ensuring efficient and leak-free fluid transfer under high pressure and varying temperatures.
Hydraulic rotary joints are specialized components designed to transfer hydraulic fluid between stationary and rotating parts of machinery. They are classified based on their design, functionality and application requirements. Here are some key classifications:
Description: Engineered for high rotational speeds, often exceeding 10,000 RPM.
Applications: High-speed spindles, automotive testing, aerospace.
Description: Capable of transferring different types of media, such as hydraulic fluid, air, and coolant, through separate passages.
Applications: Integrated systems requiring multiple media types, such as automated machinery and robotics.
Description: Feature advanced sealing technologies to prevent leaks and contamination.
Applications: Cleanroom environments, food and beverage processing, pharmaceutical manufacturing.
Description: Tailored to meet specific customer requirements, including unique configurations and materials.
Applications: Specialized industrial applications, custom machinery, and unique environmental conditions.
Description: Designed with a hollow center to allow cables, optics, or other components to pass through while transferring fluid.
Applications: Wind turbines, robotics, automation systems.
Description: Built to withstand high-temperature environments, often incorporating special materials and seals.
Applications: Metal processing, glass manufacturing, high-temperature testing.
Roller cooling: Use multi-channel water/oil rotary joints to solve the problem of roller surface temperature control during high-temperature rolling (case: The rotary joints produced by our factory are supplied to a domestic steel plant. By optimizing the joint layout, the risk of thermal stress cracking of the roll is reduced by 30%).
Continuous casting equipment: High-temperature steam rotary joints are used for crystallizer cooling to ensure the quality of the ingot.
Typical equipment: excavators, concrete pump trucks, cranes.
Functional requirements:
Achieve entanglement-free hydraulic oil supply for 360° rotating platforms to improve power transmission and flexibility
Support multi-channel hydraulic oil synchronous transmission (such as boom, bucket, and rotary motor).
Excavator rotary table: A dual-channel joint that integrates hydraulic oil and signal transmission to achieve 360° rotation operation (case: A certain brand of excavator has reduced the leakage rate by 65% ​​by upgrading the sealing structure).
Concrete pump truck: The high-pressure oil rotary joint drives the boom to unfold and needs to withstand a pressure of 20MPa.
Drying Cylinder Steam Transportation: Three-channel rotary joints simultaneously transport steam and condensed water to improve thermal efficiency (Case: A paper mill reduced steam energy consumption by 18% by optimizing the joint flow channel design).
Reactor Stirring: Corrosion-resistant material joints are used to transport chemical media and are suitable for high-temperature and strong acid environments.
Typical Systems: Gearbox Lubrication, Hydraulic Pitch Control
Wind Power Generation: Low-temperature rotary joints are used in the yaw system to adapt to extreme climates of -40°C and ensure reliability in extreme environments (Case: A wind farm has reduced its failure rate by 40% by upgrading sealing materials).
Rotary Table: High-speed joints (>1000RPM) for high-precision CNC machine tools to ensure processing accuracy.
Reduce the frequency of high-altitude maintenance (design life>20 years).
Technical Highlights:
Self-lubricating bearings: Maintenance-free design reduces operation and maintenance costs.
Low-temperature adaptable seals: Fluororubber materials maintain elasticity at extreme temperatures.
Typical scenarios: drilling platforms, fracturing equipment, subsea Christmas trees.
Functional requirements:
Withstand mud pressures above 1000 bar.
Resist Hâ‚‚S (hydrogen sulfide) corrosion.
Technical highlights:
Carbon fiber reinforced seals: 300% more wear resistance than traditional metal seals.
Explosion-proof certification: ATEX/IECEx certification ensures underground safety.
Typical equipment: welding robots, CNC machine tools, assembly lines.
Functional requirements:
Maintain a low leakage rate at high-speed rotation (>3000 rpm).
Integrated electrical slip rings transmit signals and power.
Technical highlights:
Low friction seals: Polytetrafluoroethylene (PTFE) coatings reduce energy consumption.
Modular design: supports hydraulic, pneumatic, and circuit integration.
Select according to the peak pressure, leaving a 20% safety margin (e.g., if the system pressure is 800 bar, select a 1000 bar rated product).
Dynamic balancing design is preferred for high-speed scenarios (such as the OTT-JAKOB high-speed series).
Corrosive media must match Hastelloy/titanium alloy materials, and oil media must focus on the temperature resistance of the sealing material.
Select fluoro rubber seals for low-temperature environments, and metal bellows seals for high-temperature environments.
Multi-channel joints must avoid cross-contamination (independent seal design).
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THE WORLD'S LEADING ROTARY UNIONS/ROTARY JOINTS/SWIVEL JOINTS & ACCESSORIES MANUFACTURERS
