Boom Valve Switching for Efficient and Responsive Lowering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing boom control systems in construction machines require complex valve configurations and numerous parts, leading to increased costs, space requirements, and reduced responsiveness during sudden boom operations.
Innovation Solution
A boom control system with a recovery oil passage, discharge oil passage, and supply oil passage, controlled by a boom control valve with pressure and operation detecting mechanisms, allowing for adaptive flow rate control and eliminating the need for dedicated valves by using a first and second region on the valve during boom lowering operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a recovery oil passage is provided to supply oil from the head end oil chamber to the rod end oil chamber during boom lowering, then energy efficiency is improved and pressurized oil supply from the hydraulic pump becomes unnecessary, but the acceleration of the boom cylinder becomes slower and responsiveness deteriorates when the operator suddenly operates the boom operating lever
Solution Approach 1:
The patent applies dynamics by making the oil supply system adaptable rather than fixed. The control valve switches between two operating regions (first region for recovery oil only, second region for both recovery oil and pressurized oil) based on real-time detection of operation speed and pressure conditions. This dynamic adjustment allows the system to optimize between energy efficiency and responsiveness depending on the operational context.
Solution Approach 2:
The patent changes the parameter of oil supply mode based on detected conditions. When the operation speed exceeds a predetermined threshold (sudden operation) or pressure conditions indicate machine body lifting, the system transitions from using only recovery oil to using both recovery oil and pressurized oil from the hydraulic pump. This parameter change resolves the contradiction by adapting the oil supply configuration to match the urgency of the operation.
2Speed
If a meter-in circuit is provided to supply both recovered oil and pressurized oil to the rod end oil chamber based on pressure conditions, then responsiveness during machine body lifting is improved, but the number of parts increases and device complexity worsens
Solution Approach 1:
The patent merges the functions of the meter-in circuit with the existing boom control valve. Instead of adding a separate meter-in circuit with additional valves and control mechanisms, the invention integrates the dual oil supply control into the boom control valve by defining two operating regions within it. This merging maintains responsiveness during machine body lifting while significantly reducing the number of parts and simplifying the overall system architecture.
Solution Approach 2:
The boom control valve is designed to perform multiple functions: it controls the recovery oil passage, the discharge oil passage, and the supply oil passage by switching between its first and second operating regions. This multi-functionality eliminates the need for dedicated meter-in circuit components, as the single boom control valve handles all oil flow control requirements for both normal lowering and sudden operation/machine body lifting scenarios.
3Manufacturing precision
If dedicated valves and meter-in circuits are provided for controlling oil supply during boom lowering, then oil flow control precision is improved, but the space required and device complexity increase
Solution Approach 1:
The patent combines multiple oil flow control functions into a single boom control valve structure. By integrating the control of recovery oil passage, discharge oil passage, and supply oil passage into one valve with two operating regions, the invention maintains precise oil flow control while eliminating the need for separate dedicated valves and circuits, thereby reducing the space required for housing these components.
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
This configuration improves energy efficiency, reduces the number of parts and space needed, and enhances responsiveness during sudden boom operations by dynamically controlling oil flow between recovery and supply oil passages.
Implementation Method 1
the pressure of the head end oil chamber of a boom cylinder, and based on a result of the determination, controls a flow rate of the recovery oil passage or a flow rate of the discharge oil passage
Data Source
AI summary
To be capable of dealing with a machine body lifting operation or a sudden operation, while improving energy efficiency, during a boom-lowering operation, and achieving the reduction of the number of parts, in a construction machine equipped with a boom. It is configured such that a first region Y1 at which a recovery valve passage 16e is opened and a supply valve passage 16f is closed and a second region Y2 at which the recovery valve passage 16e and the supply valve passage 16f are opened, are provided at an operating position of a first boom control valve 16 during the boom lowering operation, and the first boom control valve 16 is positioned at the first region Y1 when neither a machine body lifting operation nor the sudden operation is performed during the boom-lowering operation, and at the region Y2 when the machine body lifting operation or the sudden operation is performed.