The electro-hydraulic servo spring fatigue testing machine is a high-precision device used to test the fatigue performance of springs under repeated loads, combining electro-hydraulic servo control technology and fatigue testing technology.
1. Working principle
(1) Electro hydraulic servo system: Control the hydraulic servo valve through electrical signals, accurately adjust the flow and pressure of the hydraulic cylinder, and achieve closed-loop control of loading force, displacement, or frequency.
(2) Fatigue testing: Simulate the cyclic load (compression, tension, or torsion) of the spring in actual working conditions, record its fatigue life (number of failure cycles) and performance degradation.
2. Core components
(1) Loading framework: a high rigidity structure that supports springs and transfers loads.
(2) Hydraulic servo actuator: the core driving component that provides high dynamic response load.
(3) Servo valve and hydraulic pump station: precise control of hydraulic oil flow direction and pressure.
(4) Sensor system: force sensors, displacement sensors, etc., providing real-time feedback data.
(5) Control system: Based on PLC or dedicated controller, achieve PID regulation and waveform generation (sine wave, triangular wave, etc.).
(6) Software system: used for parameter setting, data acquisition, curve display, and report generation.
3. Application Fields
(1) Automotive industry: durability testing of suspension springs and valve springs.
(2) Aerospace: Extreme fatigue verification of high reliability springs.
(3) Mechanical manufacturing: Quality inspection of various compression/tension springs.
(4) Research institution: Research on material fatigue behavior.
4. Advantages and Characteristics
(1) High precision: The closed-loop control error can be less than ± 1% FS.
(2) High dynamic response: suitable for high-frequency cyclic testing.
(3) Long life design: The hydraulic system is resistant to high pressure and pollution.
(4) Multifunctionality: Can adapt to different fixtures and test multiple types of springs.
(5) Security protection: redundant protection against overload, overtravel, emergency stop, etc.
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