Hydraulic Liftgate: Find Optimal Cylinder for 90° Rotation

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SUMMARY

The discussion focuses on selecting the appropriate hydraulic cylinders for a liftgate conveyor system that requires a 90-degree rotation of a 7-foot section weighing approximately 500 lbs. The user is considering a two-stage hydraulic system with a 3hp motor operating at 1500-3000 psi. Critical factors include the positioning of the hinge pin and cylinder end pins, which must be defined to accurately size the hydraulic cylinders. The need for the cylinder to allow slight rotation during operation is also emphasized.

PREREQUISITES
  • Understanding of hydraulic systems and components
  • Knowledge of hydraulic cylinder sizing and specifications
  • Familiarity with pressure ratings (1500-3000 psi) in hydraulic applications
  • Basic principles of mechanical leverage and hinge mechanics
NEXT STEPS
  • Research hydraulic cylinder sizing techniques for specific applications
  • Learn about the design and selection of two-stage hydraulic systems
  • Investigate the impact of hinge pin positioning on hydraulic performance
  • Explore the specifications and selection criteria for hydraulic pumps suitable for 3hp systems
USEFUL FOR

Engineers, hydraulic system designers, and technicians involved in the design and installation of liftgate systems or similar hydraulic applications will benefit from this discussion.

kore52
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TL;DR
hydraulic requirements for liftgate actuators/cylinders
Hello everyone and thanks for any and all feedback!
I am looking for help with a hydraulic system for a liftgate conveyor I will be installing for a customer. The conveyor is 10" in length and 3' wide but the liftgate portion is only 7' long. The approx. weight of the 7' section 500lbs. My questions is what hydraulic cylinders would i need to rotate/lift the 7' section 90 degrees?

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What hydraulic pressure will always be available.
The position of the pins at the hinges and cylinder ends will be critical.
The cylinder must be free to rotate slightly during operation.
 
Im thinking a 2 stage, 3hp 1500-3000psi set up
 
kore52 said:
Im thinking a 2 stage, 3hp 1500-3000psi set up
So you always have 3000 psi available ?

Where is the hinge pin relative to the frame and moving belt ?
 
Baluncore said:
So you always have 3000 psi available ?

Where is the hinge pin relative to the frame and moving belt ?
I don’t have a pump picked yet but I can have whatever is needed. The hinges are in the side of the frame and I will mount the cylinder/s below and inside the frame rails of the conveyor
 
kore52 said:
My questions is what hydraulic cylinders would i need to rotate/lift the 7' section 90 degrees?
You must first specify the position of the hinge pin and the cylinder end pins.
Only then can you size the cylinder.
 

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