Hydraulic Jack Return Oil Valve for Overload Protection
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Solution Overview
Problem
Existing hydraulic jacks suffer from excessive top plate ascension leading to overload, damaging the jack and affecting normal use due to continuous hydraulic oil pressurization without a mechanism to prevent excessive height.
Innovation Solution
A hydraulic jack design incorporating a piston cylinder, piston rod, oil passage switching valve, and one-way return oil assembly that reverses hydraulic oil flow back to the storage chamber when pressure exceeds a set threshold, preventing further ascension and providing overload protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If hydraulic oil is continuously pressed into the hydraulic area to lift the top plate, then the lifting capability is improved, but the top plate may rise excessively causing overload damage
Solution Approach 1:
The patent applies preliminary anti-action by pre-installing a return oil passage and one-way valve assembly that automatically activates when overload occurs. The return oil passage is positioned and configured in advance to counteract excessive pressure buildup, allowing hydraulic oil to flow back to the storage chamber when the top plate rises beyond the safe limit, thereby preventing damage before it occurs.
Solution Approach 2:
The patent implements feedback through the one-way valve assembly that monitors hydraulic pressure and top plate position. When the top plate rises excessively, the increased pressure automatically opens the one-way valve, creating a feedback loop that redirects hydraulic oil back to the storage chamber, reducing pressure and preventing further excessive ascent. This automatic feedback mechanism ensures reliable overload protection.
2Reliability
If a return oil passage is added to prevent excessive top plate ascent, then overload protection is improved, but the device structure becomes more complex
Solution Approach 1:
The patent merges the return oil passage with the existing hydraulic chamber and piston rod structure. The return oil passage is integrated into the piston rod, and the one-way valve assembly is combined with the hydraulic chamber, creating a unified structure that provides overload protection without requiring separate independent components, thereby minimizing structural complexity.
Solution Approach 2:
The patent applies self-service by designing the return oil passage and one-way valve assembly to automatically activate and regulate hydraulic oil flow based on pressure conditions. The system self-regulates without external control, using the existing hydraulic pressure to open the one-way valve and redirect oil flow, eliminating the need for additional control mechanisms or complex external systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents excessive top plate ascension by reversing hydraulic oil flow, ensuring the hydraulic jack operates within safe limits and maintains normal functionality.
Implementation Method 1
When the hydraulic oil pressure of the hydraulic chamber exceeds the acting force of the one-way return oil assembly, the hydraulic oil pressure pushes open the one-way return oil assembly
Implementation Method 2
a one-way valve assembly for preventing the backflow of the oil outlet passage is disposed between the first oil inlet passage and the oil outlet passage
Data Source
AI summary
A hydraulic jack is provided which comprises a piston cylinder, a piston rod, an oil passage switching valve and an internal cylinder. The oil passage switching valve is provided with an oil outlet; a one-way valve assembly preventing the backflow of the oil outlet passage is disposed between the first oil inlet passage and the oil outlet passage; a return oil inlet passage is disposed at the bottom of the piston head; a return oil chamber in communication with the return oil inlet passage is disposed inside the piston head; a return oil outlet passage communicating the return oil chamber and the piston cylinder oil storage chamber is disposed on the piston head; a one-way return oil assembly is mounted in the return oil chamber, thus the hydraulic oil does not enter the hydraulic area and finally the top plate will not rise continuously along with pressing, providing overload protection.