Abstract
When an output curve force is applied to a horizontal servo cylinder with a heavy load, the piston rod bears a dynamic partial load based on the installation and load characteristics, which significantly affects the frequency response and control accuracy of the servo cylinder. Based on this partial load, increased friction can lead to cylinder bore scuffing, leakage, lack of output power, or even system failure. In this paper, a novel asymmetric static-pressure support structure is proposed based on the principle of hydrostatic support. The radial component force of a dynamic partial load is balanced by cooperation between the support oil cushion of the variable hydraulic pressure support structure, oil cushion of the supportive force, and the damper. Adaptive control of the servo cylinder piston rod, guide sleeve, and piston, as well as the cylinder oil film friction between lubricated surfaces is achieved. In this paper, theoretical design and analysis of the traditional hydrostatic bearing structure and novel structure are presented. A hydraulic dynamic shear scissor is used as a research target to derive a structural dynamic model. Comparative simulations are performed using Matlab Simulink. Additionally, flow field analysis of the novel structure is performed, which verifies the rationality and feasibility of the proposed structure and system.
Highlights
The servo cylinder is the executive component of a hydraulic servo system
When an overloaded horizontal servo cylinder articulates an output curve force, a partial load is placed on the piston rod based on the installation and load characteristics [1, 4, 5], creating friction between the piston rod and guide sleeve, which can lead to leakage and scuffing of the cylinder bore
Based on this research background, this paper focuses on an overloaded horizontal servo cylinder in a fullhydraulic hobbing shear
Summary
The servo cylinder is the executive component of a hydraulic servo system. Its performance directly affects overall system control accuracy under both dynamic and static conditions [1,2,3]. Most researchers have noted the influence of static pressure on the lubrication and partial load characteristics of servo cylinders, conventional hydrostatic bearing designs for hydraulic cylinder are still widely used [16,17,18]. The horizontal hinged heavy-duty servo cylinder output force must follow a precise displacement curve and the piston rod must be able to withstand the dynamic partial load. This load produces leakage, cylinder bore scuffing, seal wear, and a lack of output force. To satisfy the high-precision control requirements for position, velocity, and force, the ability of the servo cylinders to overcome the influence of partial load on sealing performance and friction loss under heavy-load, high-speed, and high-frequency responses is a key design consideration.
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