In hydraulic transmission systems, the hydraulic rotary joint serves as a critical component connecting stationary piping to rotating machinery. The specific product manufactured by Changsheng Rotary Joints is primarily designed for hydraulic equipment applications such as uncoilers and recoilers. Its overall structural design is tailored to meet the demands of low-pressure, high-speed operating conditions. With a clear working principle and high practical utility, the following section provides a detailed explanation of its specific operation and key usage considerations, examined through the lens of its structural design and operational logic.
From a structural and installation perspective, the housing of the hydraulic rotary joint remains stationary relative to the main body of the rotating equipment-such as an uncoiler or recoiler-and does not rotate synchronously with the equipment's mandrel. This stationary arrangement forms the foundation for ensuring the stable transmission of hydraulic fluid. The product typically features a configuration of three ports, specifically designed to interface precisely with the workshop's main hydraulic lines; these ports facilitate the input and output of hydraulic fluid, as well as the recovery of any leakage oil. The layout of these ports is optimized to fit within the available installation space of the equipment, making it compatible with the majority of industrial hydraulic environments.
Regarding its internal structure, the diameter of the rotary joint's mandrel is smaller than that of its housing. The clearance between the mandrel and the housing is comparable to the standard tolerances found between the cylinder barrel and piston in conventional hydraulic cylinders. This specific clearance design imposes a distinct pressure limitation: the unit as a whole cannot withstand excessively high pressures. Consequently, the normal operating pressure must strictly not exceed 3 bar, classifying this unit as a typical low-pressure-optimized structure. Although its pressure-bearing capacity is limited, the product maintains stable sealing integrity during low-pressure, high-speed operations. Its primary function is to contain and capture the minute amounts of hydraulic fluid that may seep past the rotating seals, thereby preventing fluid spillage that could contaminate the equipment or the surrounding work environment.
During operation, any seeping hydraulic fluid is channeled back to the reservoir through a dedicated return line under extremely low-pressure conditions. Throughout this process, no high-pressure surges are exerted upon the internal oil seal components; this effectively preserves the integrity of the seals and extends the overall service life of both the seals and the rotary joint itself. A critical cautionary note must be strictly observed here: under no circumstances should a filtration device be installed on the leakage oil return line. Doing so would impede the free flow of the returning leakage oil, leading to an abnormal rise in internal pressure that would directly damage the oil seals and sealing structures, thereby compromising the normal operation of the unit. Thanks to their stable, high-speed sealing performance at low pressures and reliable hydraulic fluid transmission capabilities, hydraulic rotary joints enjoy a wide range of applications across numerous industries-including mining, metallurgy, electric power, petrochemicals, and mechanical manufacturing. Primarily utilized to facilitate fluid transfer in various types of rotating hydraulic machinery, they serve as critical components for ensuring the continuous operation of equipment and the stable functioning of hydraulic systems. Furthermore, Changsheng Rotary Joints offers tailored specifications and customization services to meet the specific operational requirements of diverse equipment environments.