Sequence control device for aircraft tripod jack cylinder

Abstract

This utility model discloses a hydraulic cylinder sequential control device for an aircraft tripod jack, relating to the field of hydraulic control technology. It includes an outer cylinder, a primary cylinder, a secondary cylinder, and a one-way control valve. The primary cylinder is nested inside the outer cylinder, and the secondary cylinder is nested inside the primary cylinder, forming a nested structure. First and second control valves are symmetrically installed at the bottom of the primary cylinder, each consisting of a sealed valve body, a sealing steel ball, a spring, and an adjusting bolt. Different screw depths into the adjusting bolt result in different opening oil pressures for the two valves. Hydraulic oil pushes the primary and secondary cylinders upwards as a whole. After the primary cylinder reaches its highest position, the increased oil pressure opens the second control valve, allowing hydraulic oil to flow into the secondary cylinder, enabling it to rise independently. Reverse pressure must overcome the spring force to open the steel ball for backflow. A pressure gradient is set by the adjusting bolt to ensure the secondary cylinder retracts first. This device achieves precise cylinder extension and retraction through hydraulic sequential control, has a compact structure, is easy to adjust, and improves the welding positioning accuracy and reliability of the impact jack protective frame.

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