Interlock Spool Valve to Block Hydraulic Tie-Down Override
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Solution Overview
Problem
Hydraulic systems face unsafe tie-down situations where operators bypass safety lanyards or devices, leading to dangerous conditions due to the inconvenience of repeatedly engaging safety mechanisms.
Innovation Solution
An interlocked single-function activation valve is designed to prevent safety override by requiring the safety mechanism to be reset each time the hydraulic system is used, utilizing a hydraulic valve assembly with axially movable spools and biasing members to control fluid flow, ensuring the system remains de-pressurized until the safety mechanism is properly engaged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a safety lanyard or safety device is required to activate the hydraulic system, then safety is improved, but ease of operation deteriorates because operators must repeatedly engage the safety mechanism
Solution Approach 1:
The valve uses a dynamic spool mechanism that automatically transitions between positions based on system pressure states. The spool moves from a blocked position to an unblocked position when pressure differential exceeds a threshold, eliminating the need for manual safety engagement while maintaining safety through pressure-based control
Solution Approach 2:
The valve automatically monitors and responds to system pressure conditions without requiring operator intervention. The spool self-adjusts its position based on the pressure differential across the orifice, enabling the system to self-regulate safety conditions without manual safety device engagement
2Ease of operation
If operators are allowed to bypass the safety mechanism by tying down the clip, then ease of operation is improved, but safety deteriorates due to dangerous tie-down situations
Solution Approach 1:
The patent replaces the mechanical safety clip engagement system with a pressure-based control mechanism. Instead of relying on a mechanical clip that can be tied down, the system uses pressure differential across a small orifice to control spool position, making mechanical bypass methods ineffective
Solution Approach 2:
The valve changes the control parameter from mechanical engagement (clip position) to pressure differential. By using pressure as the controlling parameter with a small orifice creating significant pressure differential, the system prevents bypass attempts while maintaining ease of legitimate operation
3Productivity
If the hydraulic system allows continuous operation without reset, then productivity is improved, but safety deteriorates because unsafe conditions can persist
Solution Approach 1:
The valve requires periodic resetting of the spool to the blocked position when system pressure drops below the threshold. This periodic reset requirement ensures safety is重新-evaluated while allowing continuous operation during normal conditions, balancing productivity with safety
Solution Approach 2:
The system incorporates feedback through the pressure differential across the orifice that continuously monitors system state. When pressure drops indicate unsafe conditions, the feedback mechanism automatically resets the spool position, creating a safety feedback loop that maintains safety while allowing continuous operation
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
The solution effectively prevents unsafe operations by ensuring the hydraulic system can only be used once before requiring a reset, thereby preventing dangerous tie-down or override situations and ensuring user safety.
Implementation Method 1
a biasing member providing force in the axial direction toward the control member
Implementation Method 2
The hydraulic valve assembly is configured to prevent the flow of hydraulic fluid at a working pressure when the hydraulic system is de-pressurized and then re-pressurized
Data Source
AI summary
An interlocked single function activation valve for hydraulic systems is disclosed. The hydraulic valve prevents unsafe tie-down or safety override situations by requiring the safety mechanism to be reset each time the hydraulic system is used. The hydraulic valve includes an interlock spool that moves to an extension position when the hydraulic system is de-pressurized and then re-pressurized while the control lever is engaged (i.e., tied down). When the interlock spool is in the extension position, it prevents the system from reaching a working pressure, thereby forcing a reset of the control lever before the system can reach working pressure.