**1. Product Overview**
**A Double Rod Hydraulic Cylinder is a Hydraulic Actuator that extends piston rods symmetrically on both sides of a piston. Its characteristics of bidirectional equal force output and high rigidity structure make it widely used in industrial scenarios that require balanced force and precise synchronous control, such as machine tools, injection molding machines, automated production lines, etc.
**2. Core Features**
✅ ** Bi directional symmetrical output * * - The cross-sectional area of the piston rods on both sides is the same, and the pushing/pulling force for extension and retraction is equal, resulting in smoother movement.
✅ ** High rigidity anti eccentric load * * - The double rod support structure has significantly better lateral force resistance than the single rod oil cylinder.
✅ ** Precise synchronous control * * - suitable for mechanisms that require synchronous driving at both ends (such as machine tool workbenches and lifting platforms).
✅ ** Flexible installation * * - both ends can be fixed or floating, suitable for complex mechanical structures.
✅ ** Long life design * * - hard chrome plated piston rod+imported seals, wear-resistant and corrosion-resistant.
**3. Typical structure**
|* * Component * * | * * Function * * | * * Material/Process * *|
|-------------------|------------------------------------------|-----------------------------|
|* * Double piston rod * * | Symmetrically transmitting bidirectional force, with the same diameter | 45 # steel plated with hard chrome (thickness ≥ 20 μ m)|
|* * Cylinder barrel * * | Internal precision honing ensures smooth piston movement | Cold drawn seamless steel pipe (surface phosphating)|
|Sealing system * * | Bi directional leak proof (piston rod seal+piston seal) | Polyurethane (PU)+Nitrile rubber (NBR)|
|* * Installation method * * | Earrings at both ends, flange or hinge shaft in the middle | Choose according to the load type|
**4. Working principle**
-* * Extension action * *: Hydraulic oil enters from port A, pushing the piston to move to one side, causing the corresponding side piston rod to extend and the other side rod to retract.
-Retraction action: Hydraulic oil enters from port B, causing the piston to move in the opposite direction and the two side rods to move in opposite directions.
-* * Characteristics * *: The output force (F=pressure x piston area) on both sides is completely the same, and the speed is consistent (when the flow rate is the same).
**5. Main application scenarios**
-* * Machine tool equipment * *: Grinding and milling machine worktables are driven bidirectionally.
-Injection molding machinery: synchronous control of mold opening and closing.
-Automated production line: robotic arm lifting and conveyor belt leveling.
-* * Experimental equipment * *: Material fatigue testing machine with bi-directional pressure.
**6. Key parameter selection guide**
|* * Parameter * * | * * Description * * | * * Typical Range * *|
|-------------------|----------------------------------------|--------------------------|
|* * Cylinder diameter/Rod diameter * * | Determine output force (usually the same rod diameter on both sides) | Cylinder diameter: 40-200mm|
|* * Stroke * * | Single side piston rod movement distance | 100-2000mm (customizable)|
|* * Work pressure * * | System rated pressure | 10-25MPa (high pressure type up to 35MPa)|
|* * Installation method * * | Fixed at both ends (MF type), fixed at one end and floating at one end (FB type) | Choose according to the force requirements|
**7. Compare single rod oil cylinders**
|* * Features * * | * * Dual Rod Cylinder * * | * * Single Rod Cylinder * *|
|-------------------|--------------------------------------|--------------------------|
|Symmetry of output * * | Equal bidirectional force | Extension force>Retraction force (area difference)|
|* * Anti eccentric load capacity * * | Strong (double pole support) | Weak|
|* * Applicable scenarios * * | Precision equipment that requires balanced force | Conventional push-pull scenarios|
|* * Cost * * | High (complex structure) | Low|
**8. Optional features**
-Position feedback: Install magnetostrictive sensors at both ends (with an accuracy of ± 0.1mm).
-High temperature resistant seal: Suitable for environments above 80 ℃ (made of fluororubber material).
-Anti rotation design: Keyways or guide grooves prevent the piston rod from rotating.
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