**1. Product Overview**
**A Hydraulic Linear Actuator is a power device that converts hydraulic energy into precise linear motion, and uses hydraulic oil to drive pistons or plungers to achieve push, pull, position, and other actions. Its high load, high precision, and impact resistance make it irreplaceable in heavy industry, automation, aerospace, and other fields.
**2. Core Features**
✅ ** Super load capacity * * - output force can reach several tons to hundreds of tons * * (such as 200MPa ultra-high pressure models).
✅ ** Precision control * * - With the cooperation of servo valves, it can achieve * * ± 0.01mm * * level repetitive positioning accuracy.
✅ ** Anti harsh environment * * - high temperature resistance (-50 ℃~200 ℃), anti-corrosion (stainless steel/coating design).
✅ ** Modular expansion * * - can integrate displacement sensors, pressure feedback, mechanical locking and other accessories.
**3. Typical structural types**
|* * Type * * | * * Principle * * | * * Features * * | * * Application Scenarios * *|
|-------------------|--------------------------|--------------------------------------|-------------------------|
|* * Piston type oil cylinder * * | Hydraulic push piston bi-directional motion | Standard structure, high cost performance | Construction machinery, injection molding machine|
|* * Piston actuator * * | Single plunger unidirectional thrust | Resistant to ultra-high pressure, long stroke (up to 10 meters+) | Hydraulic press, ship servo|
|* * Scalable multi-stage cylinder * * | Multi section sleeve extends step by step | Compact installation space achieves long stroke | Self dumping truck, fire ladder|
|* * Servo Hydraulic Cylinder * * | Closed loop control+high-precision sensor | Fast dynamic response, micrometer level positioning | Aerospace, precision stamping|
**4. Key performance parameters**
|* * Parameter * * | * * Description * * | * * Typical Range * *|
|-------------------|----------------------------------------|--------------------------|
|* * Output * * | Thrust/Tension (F=Pressure x Effective Area) | 1kN~5000kN|
|* * Journey * * | Movable straight-line distance | 10mm~15m (customizable)|
|* * Work pressure * * | System pressure | Conventional 16-31.5MPa, ultra-high pressure 200MPa|
|* * Repetitive accuracy * * | Positioning deviation under closed-loop control | ± 0.01mm~± 0.5mm|
|* * Speed * * | Piston movement speed (depending on flow rate) | 0.1~500mm/s|
**5. Compare electric actuators**
|* * Features * * | * * Hydraulic linear actuator * * | * * Electric linear actuator * *|
|-------------------|------------------------------------|----------------------------|
|* * Output * * | Extremely large (suitable for heavy loads) | Small (usually<50kN)|
|* * Accuracy * * | High (requires closed-loop system) | Extremely high (stepper/servo motor control)|
|* * Impact Resistance * * | Extremely Strong (Hydraulic Buffer) | Weak (Vulnerable Screw/Gear)|
|* * Maintenance cost * * | High (requiring Hydraulic System) | Low|
|* * Typical applications * * | Stamping machines, ship servos, spacecraft actuators | 3C automation, medical equipment|
**6. Industry application cases**
-* * Heavy industry * *: Rolling mill pressing device in steel plants (5000kN thrust level).
-Energy: Variable pitch hydraulic cylinder for wind turbines (resistant to -40 ℃ low temperature).
-Aerospace: Aircraft landing gear actuator (200MPa ultra-high pressure).
-Automotive manufacturing: Body stamping machine tool (0.1mm synchronous accuracy).
**7. Selection Guide**
1. * * Clarify load and speed * *: Calculate the required thrust/tension and movement speed.
2. Determine the control method:
-Open loop control (manual Directional Valve)
-Closed loop control (servo valve+displacement sensor)
3. * * Environmental adaptability * *: Special materials are required for high temperature/corrosive environments.
4. * * Safety redundancy * *: Safety options such as burst valves and mechanical locks.
**8. Preventive maintenance * *:
-Check the cleanliness of the oil every 500 hours (NAS level 6-8).
-Regularly release pressure and check the nitrogen pressure of the accumulator.
**9. Customized services**
-* * Non standard travel * * (such as a 20 meter long column plug cylinder).
-* * Extreme environment adaptation * * (deep-sea pressure resistance, desert dust prevention).
-Intelligent integration (IoT remote monitoring+predictive maintenance).
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