Hydraulic Line Relief Valve Adjustment With Pump Flow Control
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Solution Overview
Problem
Manual line relief valves in hydraulic systems of working machines like hydraulic shovels require manual adjustment, necessitating multiple personnel and lack precise control over relief setting pressure, leading to inefficiencies and inaccuracies.
Innovation Solution
A control device assists in adjusting the relief setting pressure of manual line relief valves using a control device that includes a target value setting, pump flow rate control, and notification means, allowing for accurate and efficient adjustment with minimal personnel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If manual line relief valves are used to limit maximum pressure in hydraulic actuators, then cost is reduced and simplicity is improved, but adjustment accuracy deteriorates and multiple personnel are required for operation
Solution Approach 1:
The patent replaces the purely manual mechanical adjustment system with an automated control system that uses a controller to operate the line relief valve. The controller receives input signals and automatically adjusts the relief valve setting, substituting manual mechanical operation with automated electronic control, thereby improving adjustment accuracy while maintaining cost-effectiveness.
Solution Approach 2:
The patent introduces a controller as an intermediary between the operator and the line relief valve. The controller acts as a mediator that receives adjustment commands and translates them into precise valve positioning, eliminating the need for direct manual manipulation and improving adjustment precision without requiring complex manual procedures.
2Device complexity
If manual adjustment of relief setting pressure is performed, then device complexity is reduced, but operation time increases and productivity decreases
Solution Approach 1:
The patent substitutes manual mechanical adjustment operations with automated electronic control. The controller automatically positions the line relief valve based on input signals, replacing time-consuming manual adjustment procedures with rapid automated control, thereby improving productivity without significantly increasing device complexity.
Solution Approach 2:
The control system enables the line relief valve to self-adjust based on controller commands. The automated system performs the adjustment function independently without requiring continuous manual intervention, allowing for faster operation and improved work efficiency while maintaining relatively simple device architecture.
3Reliability
If multiple personnel are required for manual adjustment operation, then safety is improved through supervision, but operation complexity increases and ease of operation deteriorates
Solution Approach 1:
The patent replaces manual mechanical adjustment operations with automated electronic control. The controller automatically adjusts the line relief valve based on input signals, eliminating the need for multiple personnel to manually operate and supervise the adjustment process, thereby improving ease of operation while maintaining safety through automated control.
Solution Approach 2:
The controller serves as an intermediary that automates the adjustment process, replacing the need for multiple human operators. The automated system receives commands and executes precise valve positioning without requiring manual supervision or coordination between multiple personnel, simplifying the operation while maintaining reliability.
4Measurement precision
If electromagnetic proportional valves or relief pressure variable cylinders are added to enable automatic adjustment, then adjustment precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex electromagnetic proportional valves and relief pressure variable cylinders with a simplified automated control system. The controller directly actuates the line relief valve using a simpler mechanical or electromagnetic mechanism, achieving comparable adjustment precision with reduced device complexity and lower cost.
Solution Approach 2:
The patent employs a cost-effective control mechanism that achieves precise adjustment without requiring expensive electromagnetic proportional valves or complex variable cylinders. The simplified automated control system provides adequate precision at lower cost and complexity, replacing high-cost components with more economical alternatives.
Data Source
AI summary
Problem: In a hydraulic system in which a manual line relief valve that adjusts the relief setting pressure is arranged in the line relief oil path formed by branching from the actuator line from the control valve to the hydraulic actuator, the relief setting pressure adjustment operation of the line relief valve can be performed independently with good accuracy. Solution: A controller 20 for controlling a perform of a relief setting pressure adjustment operation of a line relief valve 25 is provided with a pump flow control means that controls the pump flow rate during the relief setting pressure adjustment operation, an instruction command output means 54 that instructs a perform of the relief setting pressure adjustment operation by a manual operation, and a notification command output means 55 that notifies that the pump pressure detected by a pressure sensor 31 during the relief setting pressure adjustment operation is within a predetermined range of the target relief setting pressure.