What specifications should be considered when selecting a hydraulic cylinder for a scissor lift?

When selecting a Hydraulic Cylinder for Scissor Lift Aerial Platform, it is essential to consider several key specifications to ensure safe, efficient, and reliable operation. The right cylinder must be matched precisely to the platform's mechanical design, load requirements, and working conditions. Below are the main factors to evaluate:

1. Stroke Length
Definition: The distance the piston rod travels from fully retracted to fully extended.

Importance: Determines how high the scissor arms can raise the platform. A stroke that is too short will limit lift height; one that is too long can cause overextension and instability.

2. Bore Diameter
Definition: The internal diameter of the cylinder barrel.

Importance: Affects the lifting force, as larger bores allow for greater hydraulic pressure surface area. For heavier loads, a larger bore is often necessary to generate enough force.

3. Rod Diameter
Definition: The diameter of the piston rod.

Importance: A thicker rod offers better resistance to bending and side loading, which enhances stability and durability under heavy loads or long-stroke applications.

4. Working Pressure (Rated Pressure)
Definition: The maximum operating pressure the cylinder can handle safely.

Importance: Must be compatible with the system’s hydraulic pressure. Common values range from 160 to 250 bar, depending on the platform design and load class.

5. Mounting Type
Common Options: Clevis mount, trunnion mount, flange mount, spherical bearing.

Importance: The mounting style determines how the cylinder is attached to the scissor structure and affects alignment, movement arc, and ease of maintenance.

6. Cylinder Speed
Definition: The speed at which the cylinder extends or retracts.

Importance: Influences the lift speed. The flow rate of hydraulic fluid and internal port sizes will affect how quickly the platform can raise or lower.

7. Load Capacity
Definition: The maximum weight the cylinder can safely lift.

Importance: Must match or exceed the scissor lift’s rated platform capacity, accounting for dynamic loads and safety margins.

8. Sealing System
Importance: High-quality seals prevent fluid leakage, resist wear, and withstand contaminants and temperature changes. This directly affects lifespan and safety.

9. Cylinder Material and Surface Treatment
Common Materials: High-strength alloy steel or corrosion-resistant coatings.

Importance: The cylinder body and rod must resist corrosion, abrasion, and fatigue—especially in outdoor or high-humidity environments.

10. Synchronization (for dual-cylinder systems)
Importance: In lifts that use two or more cylinders, synchronization ensures even platform movement. Uneven extension could lead to tilting or mechanical damage.

Summary Table

Choosing the right Hydraulic Cylinder for Scissor Lift Aerial Platform requires careful coordination with the platform’s mechanical design, intended usage, and safety standards. A well-matched cylinder not only ensures smooth lifting performance but also extends service life and minimizes maintenance costs.