Hydraulic Swing Anti-Drift Valve for Leakage Isolation
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Solution Overview
Problem
Existing hydraulic swing systems in construction machinery suffer from drift due to internal leakages, especially when the machine is positioned on a slope with a load, leading to unwanted movement and operator fatigue, and conventional anti-drift systems require manual adjustment and wear out quickly.
Innovation Solution
A hydraulic swing system with a blocking valve and relief valve that automatically engages when the machine is stationary or rotating below a threshold speed, isolating leakage and preventing drift without operator intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate braking system is used to prevent drift, then drift prevention is achieved, but additional wear and tear on braking components occurs and service lifespan decreases
Solution Approach 1:
The patent extracts the drift prevention function from the braking system by introducing a separate blocking valve that isolates hydraulic leakage. This allows the braking system to be removed or minimized, preventing wear on braking components while maintaining drift prevention through the blocking valve that seals leakage paths in the hydraulic circuit.
Solution Approach 2:
The blocking valve acts as an intermediary component between the hydraulic pump and motor, preventing leakage-induced drift without requiring the braking system to engage. This mediator handles the drift prevention function through hydraulic sealing rather than mechanical friction, extending braking component lifespan.
2Device complexity
If manual adjustment is required for anti-drift systems, then system simplicity is maintained, but operator fatigue increases and operation becomes less convenient
Solution Approach 1:
The blocking valve is designed to automatically engage and disengage based on hydraulic pressure conditions without operator intervention. The valve self-regulates to prevent drift during stationary periods and automatically opens when rotation is commanded, eliminating manual adjustment requirements and reducing operator fatigue.
Solution Approach 2:
The system incorporates automatic feedback through hydraulic pressure sensing that triggers the blocking valve to engage when leakage causes pressure drops indicating drift conditions. This closed-loop response prevents drift without operator input while maintaining system simplicity through passive hydraulic control.
3Productivity
If the swing brake is not applied, then machine operation is maintained, but drift occurs due to internal leakages
Solution Approach 1:
The blocking valve engages in advance before drift can occur by sealing hydraulic leakage paths when the system detects stationary conditions or low rotation rates. This preliminary blocking of leakage paths prevents position instability without requiring the swing brake to be applied, maintaining operational continuity.
Solution Approach 2:
The blocking valve dynamically adjusts its state based on system conditions - engaged during stationary periods to prevent drift, and automatically disengaged when rotation is commanded. This dynamic behavior maintains position stability when needed while ensuring smooth operation during movement, eliminating the need for continuous brake application.
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
Significantly reduces or eliminates swing drift, enhancing operator comfort and machine stability by preventing unwanted movements, reducing wear on braking components, and eliminating the need for manual adjustments.
Implementation Method 1
a first blocking valve connected to the first control valve, having a first position and a second position driven by a solenoid and a return
Implementation Method 2
a hydraulic pump driven by a motive device
Implementation Method 3
a hydraulic motor configured to drive rotation of the hydraulic swing system
Data Source
AI summary
A system and method for a hydraulic swing system of a machine to prevent drift without engaging a swing brake is described. The hydraulic swing system includes a pump powered by a motive element such as an engine and provides a swing motor for rotating the chassis of the machine relative to the undercarriage. The swing system includes a control valve on a first path between the pump and the motor and a second control valve on a second path. The swing system further includes a blocking valve to blocking hydraulic fluid flow and thereby preventing drift engaged when the system is in neutral and below a threshold rotation rate.