The upgrading of mining equipment has made the operating environment of hydraulic rotary actuators more complex. The wear mechanism has changed from a single load type to a multi-factor coupled type. High load, high frequency, complex environment, and dynamic impact together constitute the core challenges. In the future, it is necessary to make joint efforts from multiple aspects such as materials, surface engineering, structural optimization, and operation monitoring to build a systematic solution, realize the synchronous improvement of wear resistance and service cycle, and ensure the efficient and stable production of mines.

Currently, mining equipment is accelerating its upgrading towards large-scale, high-load, and intelligent development, which has directly changed the working conditions of hydraulic systems. As a core executive component of mining machinery, the wear resistance and service life of hydraulic rotary actuators directly determine the operational stability and production efficiency of equipment. They are facing new multi-dimensional and high-difficulty challenges that need to be addressed collaboratively from multiple levels.

I. Load Upgrade: Essential Changes in Wear Mechanism

The increase in equipment tonnage → the synchronous rise of system pressure and output force → hydraulic rotary actuators operate under high stress for a long time. The contact stress between the piston rod and the guide sleeve increases sharply, which is prone to the superposition of adhesive wear and fatigue wear; if the surface material has uneven structure and unreasonable residual stress, it will lead to the expansion of microcracks, coating peeling, and substrate damage. Compared with the traditional single wear, it has now transformed into multi-factor coupled damage, which greatly increases the requirements for material strength and surface treatment quality.

II. High-Frequency Operation: Significant Increase in Wear Accumulation Speed

The acceleration of production rhythm → the extension of equipment operation time and maintenance cycle → the high-frequency reciprocating movement of hydraulic rotary actuators, the shortening of oil film formation time, and the increase in the proportion of boundary lubrication. The tiny particles in the oil form three-body wear, which intensifies the material loss of the cylinder barrel and piston rod; the temperature rise leads to changes in oil viscosity, further accelerating wear. The wear resistance life is no longer only determined by material hardness, but is jointly affected by lubrication status, sealing quality, and system cleanliness.

III. High-Pressure Trend: Severe Test of Material Performance

The increase in the rated pressure of the system → the cylinder components need higher yield strength and fatigue limit. Taking the piston rod as an example, it needs to meet both high surface hardness (wear resistance) and high core toughness (impact resistance). The traditional single surface hardening treatment is prone to cracking and falling off. Composite strengthening technology, gradient structure materials, and refined heat treatment have become an inevitable trend. The uniformity of material metallographic structure and the control of residual stress directly determine the stability of wear resistance life.

IV. Complex Environment: Continuous Pressure on Sealing System

Mines have high dust concentration and high particle hardness, and the operation speed of equipment increases after upgrading → impurities are easy to attach to the surface of the piston rod. When the dust scraping capacity of the sealing system is insufficient, impurities will scratch the surface to form groove wear and damage the oil film; temperature difference affects the elasticity and resilience of sealing materials, leading to uneven contact pressure, resulting in leakage and abnormal wear. Wear resistance has become a comprehensive problem involving sealing system, structural design and material selection.

V. Intelligent Control: Dynamic Impact Shortens Service Cycle

The improvement of automation → the executive action of the cylinder is accurate and responsive, but frequent start-stop produces instantaneous pressure fluctuation, forming hydraulic impact. Hydraulic impact will form high stress concentration areas, which will generate additional loads on piston connection, transition fillet and welding structure, and form fatigue crack sources under long-term action. The traditional static safety factor design can no longer assess the risk, and it is necessary to rely on dynamic load analysis and fatigue life prediction model optimization.

VI. Key Breakthrough: Upgrading of Surface Engineering Technology Is the Core Path

Traditional surface plating technology cannot meet the requirements of high adhesion and anti-crack expansion. Composite coating, laser cladding strengthening, and multi-layer structure surface treatment technologies are gradually applied. By improving the bonding strength and surface density, the ability of anti-abrasive wear and anti-impact is enhanced; at the same time, it is necessary to strictly control the processing accuracy (roughness, roundness, straightness), and tiny errors will directly affect the wear performance.

VII. Supporting Requirements: The Upgrade of Operation and Maintenance Mode Forces the Optimization of Life Management

The popularization of online monitoring systems → real-time collection of pressure, temperature, and displacement data to dynamically identify abnormal wear trends. This puts higher requirements on the manufacturing consistency of the cylinder. Only by ensuring batch stability and dimensional accuracy can the monitoring data be comparable, which can support the predictive maintenance system and realize the scientific management of wear resistance life.