Double Balancing Valve Control for Stable Hydraulic Load Holding
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Solution Overview
Problem
Existing telescopic handlers experience uncontrolled load movements due to incomplete closure of lowering control valves, often caused by mechanical processing debris, posing a significant safety risk.
Innovation Solution
A movement control device with dual balancing valves and a four-way distributor, ensuring simultaneous closure of conduits under low pressure conditions, and incorporating status detection for valve malfunctions, to prevent uncontrolled load movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single lowering control valve is used to prevent fluid discharge from the base side of the cylinder, then the device complexity is reduced, but the reliability deteriorates because the valve may not adopt a complete closing position due to mechanical debris
Solution Approach 1:
The single lowering control valve is segmented into two separate balancing valves (first balancing valve on the first conduit, second balancing valve on the second conduit). Each valve independently controls fluid discharge from its respective chamber, ensuring that if one valve fails to close completely, the other can still prevent uncontrolled load descent. This segmentation directly resolves the contradiction by improving reliability through redundancy while maintaining manageable device complexity.
Solution Approach 2:
The patent implements beforehand cushioning by positioning two balancing valves in series on each conduit, creating a backup system that compensates for potential valve failure. The valves are arranged so that even if mechanical debris prevents one valve from closing completely, the second valve serves as a protective barrier against uncontrolled fluid discharge, thereby cushioning against the harmful effect of valve failure before it can cause uncontrolled load descent.
2Ease of operation
If the distributor connects both chambers to discharge in the central position, then the ease of operation is improved, but the stability deteriorates because the load may lower uncontrollably when the balancing valve does not close completely
Solution Approach 1:
The fluid discharge pathways are segmented into separate controlled channels, each with its own balancing valve. This segmentation allows the distributor to maintain its simple central position configuration (improving ease of operation) while the segmented valve control ensures that each chamber's discharge is independently controlled, preventing uncontrolled load descent and maintaining stability even when one valve may not close completely.
Solution Approach 2:
The dual balancing valve configuration provides beforehand cushioning against the instability that would result from incomplete valve closure. By having two valves in series on each conduit, the system is cushioned against the harmful effect of one valve failing to close completely, thereby maintaining load stability while preserving the ease of operation through the distributor's simple central position design.
3Reliability
If a single balancing valve is used per conduit, then the device complexity is reduced, but the reliability worsens because free particles inside the cylinder can prevent complete valve closure, causing uncontrolled load movement
Solution Approach 1:
The patent segments the single balancing valve function into two separate balancing valves positioned in series on each conduit. This segmentation ensures that if free particles prevent one valve from closing completely, the second valve still provides a barrier against uncontrolled fluid discharge, thereby improving reliability without significantly increasing device complexity since the valves are integrated into the existing conduit structure.
Solution Approach 2:
The dual balancing valve arrangement implements beforehand cushioning by creating a redundant protective barrier against the harmful effect of free particles. If particles prevent the first valve from closing completely, the second valve serves as a cushioning backup that prevents uncontrolled load movement, thereby improving reliability while maintaining acceptable device complexity through efficient use of the existing hydraulic circuit architecture.
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
Substantially eliminates the risk of uncontrolled load descent by ensuring stable load maintenance and immediate detection of valve malfunctions, enhancing safety and reliability.
Implementation Method 1
A first balancing valve (11) is positioned along the first conduit (10)... A second balancing valve (21) is positioned along the second conduit (20)... ensuring simultaneous closure of fluid pathways under low pressure conditions
Implementation Method 2
The first balancing valve (11) is normally closed and is actuated towards an open position by the pressure present in the second conduit (20)... The second balancing valve (21) is normally closed and is controlled towards an open position by the pressure present in the first conduit (10)
Data Source
AI summary
A device for controlling movement of a load. The device includes a first conduit, designed to be connected to a first chamber of a hydraulic actuator, a second conduit designed to be connected to a second chamber of the hydraulic actuator, a first balancing valve, positioned along the first conduit, which is normally closed and is actuated towards an open position by the pressure present in the second conduit, a second balancing valve, positioned along the second conduit, which is normally closed and is controlled towards an open position by the pressure present in the first conduit, and a third balancing valve, positioned along the first conduit, which is normally closed and is actuated towards an open position by the pressure present in the second conduit.