Blade Cylinder Check Valve Layout for Drift Prevention
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Solution Overview
Problem
Existing drift-prevention systems for working machines, such as hydraulic shovels, face challenges in preventing machine body drifting without adding new hydraulic or pilot lines, especially when piping is damaged, due to the complexity and cost associated with additional line configurations.
Innovation Solution
A drift-prevention valve device is mounted on fluid-pressure cylinders, incorporating a non-return valve with an accommodation part, a power piston, and a separate piston accommodation part, which allows fluid flow from a control valve to a fluid chamber while preventing reverse flow, eliminating the need for additional pilot lines by using the existing fluid pressure to control the valve element and power piston.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pilot operated non-return valve is used to prevent drift, then the machine body stability is improved, but the device complexity increases due to additional piping and pilot lines
Solution Approach 1:
The patent combines the non-return valve and pilot check valve functions into a single integrated valve body. The non-return valve prevents reverse flow of hydraulic fluid while the pilot check valve controls the pilot pressure, both functions merged in one component rather than separate valves with separate piping.
Solution Approach 2:
The integrated valve serves multiple functions: it acts as a non-return valve to prevent drift, a pilot check valve to control pilot pressure, and a flow control valve. This multi-functional design eliminates the need for separate dedicated valves and their associated piping systems.
2Reliability
If additional pilot lines are added to the swivel joint, then the drift prevention capability is improved, but the manufacturing cost increases
Solution Approach 1:
The patent merges the pilot line function into the existing hydraulic circuit by using the same valve body for both pilot pressure control and main hydraulic flow control, eliminating the need for separate pilot lines and reducing manufacturing complexity.
Solution Approach 2:
The system uses its own hydraulic fluid pressure to operate the pilot check valve and control the non-return valve, eliminating the need for external pilot lines or additional control systems.
3Reliability
If piping is made more robust to prevent damage, then the reliability is improved, but the device complexity and cost increase
Solution Approach 1:
The patent consolidates multiple valve functions into a single integrated valve body that is directly mounted on the hydraulic cylinder, eliminating the need for extensive external piping networks and reducing the complexity of the hydraulic distribution system.
Solution Approach 2:
The integrated valve is mounted directly on the hydraulic cylinder, segmenting the hydraulic system into localized functional units. This reduces the length and complexity of piping while improving reliability by minimizing potential failure points.
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 enables the actuation of the blade device to prevent machine body drifting with a simple setup, reducing the risk of fluid leakage and maintaining stability without the need for additional pilot lines, thus enhancing the reliability and cost-effectiveness of the system.
Implementation Method 1
configured to allow a flow of working fluid from the control valve to the first fluid chamber of the fluid-pressure cylinder and check the flow of the working fluid in the reverse direction
Implementation Method 2
operable by a difference between an urging force of the valve element by the urging member of the non-return valve and a second fluid chamber pressure of the fluid-pressure cylinder
Data Source
AI summary
To provide a drift-prevention valve device, a blade device, and a working machine capable of operating an actuated unit and preventing the machine body from drifting with a simple configuration. The drift-prevention valve device is provided with a non-return valve 41 that allows the flow of hydraulic oil from a control valve 28 to a head chamber 34h of a blade cylinder 34 and blocks the flow of the hydraulic oil in the reverse direction; and a piston accommodation part 42 separately disposed from an accommodation part 70 of the non-return valve 41, configured to movably accommodate a power piston 43. The power piston 43 defines a first piston chamber 42p1 communicating with a rod chamber of 34r of the blade cylinder 34 and a second piston chamber 42p2 for drain positioned on a poppet 71 side of the non-return valve 41 and communicating with a tank 52. The power piston 43 is connected to the poppet 71 of the non-return valve 41, so that the power piston 43 can be operated by the difference between the urging force of the poppet 71 by a spring 72 of the non-return valve 41 and a rod chamber pressure of the blade cylinder 34.