Photo of Servo Hydraulic Cylinder
Servo Hydraulic Cylinder
High Precision · High Dynamics · High Reliability
A Servo Hydraulic Cylinder is a fully closed-loop controlled actuator integrating a precision cylinder body, high-performance sensor suite, electro-hydraulic servo valve, and intelligent controller.
It provides continuous, real-time, and highly accurate control of position, velocity, and force, serving as the unified core of Sensing – Decision – Execution in modern advanced equipment.
1. Multi-Dimensional Closed-Loop Control Architecture
1.1 Position & Velocity Closed-Loop Control
According to accuracy, speed, and environmental requirements, different displacement transducers can be configured:
1.2 Force & Pressure Closed-Loop Control
・ Pressure Sensors (Chamber Pressure Monitoring)
Installed in the rod and/or cap chamber. Force is calculated by pressure × piston area. Widely used in AGC, press-fit, and force-regulated processes.
・ Load Cells (Rod-End Force Sensors)
Direct measurement of push/pull force with the highest accuracy. Ideal for material testing and fatigue loading.
1.3 Multi-Mode & Hybrid Control
Advanced servo systems support seamless switching or blending of multiple control modes within one operation cycle:
・ Position → Force Switching Control
Example: robotic interference/press-fit assembly
Fast approach under position mode → automatic transition to force mode upon contact → constant-force insertion to avoid jamming or damage.
・ Hybrid Force–Position Control
Example: AGC cylinders in rolling mills
Both roll gap (position) and rolling force must be precisely controlled to achieve accurate thickness regulation.
2. Technical Advantages
・Ultimate Precision
Micron-level positioning, stable velocity control, and highly accurate force regulation.
・High Dynamic Response
Millisecond-level response time to meet high-speed, high-acceleration industrial applications.
・High Power Density
Inherits the fundamental advantages of hydraulic transmission, easily delivering tens to hundreds of tons of output force.
・Energy Efficiency
When combined with a servo pump unit, energy consumption can be significantly reduced compared with conventional valve-controlled systems.
・Flexibility & Intelligence
Motion profiles and control modes can be reconfigured through software—one actuator suitable for multiple technological processes.
Ideal for flexible manufacturing, smart factories, and digital twin systems.
3. Application Fields: Empowering Advanced Equipment
Metallurgical Equipment
・ Continuous casting and rolling lines
・ Mold oscillator
・ AGC (Automatic Gauge Control) cylinders
・ Electrodes lifting for EAF
・ Servo alignment, centering, and precision positioning
Intelligent Press-Fit & Assembly
・ Interference assembly of engines, bearings, gears
・ Full monitoring of force–displacement curves to ensure assembly quality
Material & Structural Testing
・ Fatigue testing machines
・ Universal testing machines
・ Complex load spectrum simulation
Metal Forming
・ Precision stamping, bending, embossing
・ Closed-loop control of forming force and depth
Simulation & Motion Platforms
・ Flight simulators
・ Earthquake simulation platforms
・ Multi-DOF dynamic actuators
Heavy-Duty Robotics
・ High-precision joints for large collaborative robots
・ High-force operations with stable fine control
Aerospace Ground Testing
・ Landing gear extension/retraction simulation
・ Flight control surface load simulation
4. URANUS – Global Expert in Custom Servo Hydraulic Cylinders
Since its establishment, Tianjin URANUS Hydraulic Machinery Co., Ltd. has successfully designed, engineered, and manufactured hundreds of customized servo hydraulic cylinder models and over ten thousand units for customers across metallurgy, aerospace, testing equipment, robotics, automotive manufacturing, and many other industries.
URANUS offers:
・ Strong non-standard engineering & customization capability
・ Advanced precision machining centers and large-scale processing equipment
・ We can produce piston rods with sintered surface materials such as tungsten carbide (WC), silicon carbide (SiC), aluminum oxide (Al2O3), silicon nitride (Si3N4), and zirconium oxide (ZrO2), as well as alloy steel and stainless steel, to meet various special operating conditions.
・ Comprehensive servo control and testing platforms
・ Full quality-traceability and rigorous inspection standards
We welcome global partners to cooperate on customized servo cylinders, high-precision hydraulic actuators, and OEM/ODM electro-hydraulic servo systems.
Product Examples
1.Name: Servo Vibration Hydraulic Cylinder; Model: USYJ220/160-500LH
Bore: 220 mm; Rod: 160 mm; Stroke: 500 mm; Cushion stroke: 50 mm
Working pressure: 28 MPa; Test pressure: 35 MPa; Starting pressure ≤ 0.2 MPa
2.Name: Servo Vibration Hydraulic Cylinder; Model: USYR220/160-500LH
Bore: 220 mm; Rod: 160 mm; Stroke: 500 mm; Cushion stroke: 50 mm
Working pressure: 28 MPa; Test pressure: 35 MPa; Starting pressure ≤ 0.2 MPa
3.Name: Embedded Centering Triple-Cylinder Composite Servo Hydraulic Actuator;
Model: USYQ225/195-32+140/50-32HA+FK
Vibration cylinder: Bore 225 mm; Rod 195 mm; Stroke ±16 mm; Cushion stroke 50 mm
Working pressure 21 MPa; Test pressure 32 MPa; Vibration frequency 200 Hz
Embedded centering cylinder: Bore 140 mm; Rod 50 mm; Stroke ±16 mm; Cushion stroke 50 mm
Working pressure 21 MPa; Test pressure 32 MPa
Balance cylinder: Piston diameter 220 mm; Rod-side area 8149 mm²; Annular area 38013 mm²
4.Name: Rack-and-Pinion Swing Servo Hydraulic Cylinder; Model: UBFKD40-90°
Bore: 40 mm; Swing angle 90°; Vibration frequency 50 Hz; Amplitude ±3°;
External angular displacement sensor
Working pressure: 14 MPa; Test pressure: 21 MPa; Rated-pressure output torque 770 N·m
5.Name: Servo Hydraulic Cylinder; Model: UGDT40/28-200
Bore: 40 mm; Rod: 28 mm; Stroke ±100 mm; Vibration frequency 200 Hz; Amplitude ±1–10mm
Working pressure: 16MPa; Test pressure: 24 MPa;
Built-in displacement sensor，Servo valve installed
6.Name: High-Temperature Servo Hydraulic Cylinder; Model: UYS100/70-1100
Bore: 100 mm; Rod: 70 mm; Stroke 1100 mm
Built-in displacement sensor; Magnetostrictive displacement sensor on piston rod end
Working pressure: 16 MPa; Test pressure: 24 MPa
7.Name: Material Fatigue Testing Machine Servo Hydraulic Cylinder; Model: UYSTD800+500/360-620
Bore: Large cylinder 800 mm; Small cylinder 500 mm; Rod 360 mm; Stroke ±305 mm
Working pressure: 23 MPa; Test pressure: 37.5 MPa; Starting pressure ≤ 0.1 MPa
Built-in displacement sensor; Vibration frequency 1–10 Hz
Copyright © 2024 by Tianjin Uranus Hydraulic Machinery Co., Ltd.
EN
