The cylinder expansion joint (also known as the cylinder buffer joint or cylinder stroke regulating device) is a component in the cylinder used to adjust the stroke of the piston rod or buffer shock.
1. Basic functions
Stroke adjustment: The extension or retraction position of the cylinder is adjusted through mechanical limit methods to meet different working requirements.
Buffering effect: Decelerate at the end of the stroke, reduce the impact of the piston on the end cover, and lower noise and wear.
Protect the cylinder: Avoid overloading or rigid collisions to extend the cylinder's lifespan.
2. Common types
(1) Mechanical adjustable expansion joint
Structure: Fixed at the end of the piston rod through threads or lock nuts, adjust the position of the limit block.
Features: Manual adjustment, simple structure, low cost, but requires shutdown for adjustment.
(2) Hydraulic buffer expansion joint
Principle: Utilizing hydraulic oil for damping and buffering, the buffering force is controlled by adjusting the throttle valve.
Application: High-speed or heavy-load cylinders to achieve smooth stopping.
(3) Elastic buffer section (spring type)
Principle: Built-in springs absorb impact energy, suitable for light-load and high-frequency scenarios.
(4) Magnetic expansion joint
Principle: The stroke is adjusted by the position of the magnetic coupling slider of the magnetic rodless cylinder without mechanical contact.
3. Typical application scenarios
Automated equipment: such as robotic arms and fine-tuning of feeding mechanisms.
Stamping machinery: Prevent rigid collisions of molds.
Handling system: Adjust the travel of the gripper or lifting platform.
Construction machinery: Stroke limit of hydraulic cylinders.