Backflow Prevention Circuit Control for Float-Position Blade Lifting
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Solution Overview
Problem
In working machines with backflow prevention circuits, the blade cannot be lifted when the directional switching valve is in the float position, limiting its free movement.
Innovation Solution
A method for controlling the working machine that allows the backflow prevention circuit to be disabled by a pilot signal during specific operations, enabling the blade to move bidirectionally between positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a backflow prevention circuit is provided to prevent machine body fall, then safety is improved, but the blade cannot be lifted when the directional switching valve is at the float position
Solution Approach 1:
The backflow prevention circuit is designed to dynamically switch between enabled and disabled states based on operational requirements. The disabling circuit receives pilot signals from the operation system to temporarily deactivate the backflow prevention function, allowing the blade to be lifted freely during float position operation while maintaining safety during normal operation.
Solution Approach 2:
The system changes the flow resistance parameter of the backflow prevention circuit from high (when enabled) to low (when disabled) by controlling the disabling circuit with pilot signals. This parameter change allows the same circuit to provide both safety protection and free movement capability depending on the operational state.
2Adaptability or versatility
If the directional switching valve is set to float position for free blade movement, then adaptability is improved, but the blade cannot be lifted due to backflow prevention
Solution Approach 1:
The backflow prevention circuit transitions from a static always-enabled state to a dynamic state that can be temporarily disabled. The disabling circuit responds to pilot signals during float position operation to allow bidirectional blade movement, combining the benefits of both float mode and safety protection.
Solution Approach 2:
The disabling circuit acts as an intermediary between the operation system and the backflow prevention circuit. It receives pilot signals from the operation system and translates them into control actions that temporarily disable the backflow prevention function, enabling smooth coordination between safety requirements and operational flexibility.
3Reliability
If the backflow prevention circuit is always enabled to prevent falling, then reliability is improved, but the working machine cannot be made multifunctional
Solution Approach 1:
The backflow prevention circuit is designed with multi-functionality through the disabling circuit. It serves dual purposes: providing safety protection during normal operation and enabling free blade movement during float position operation. This universal design allows a single circuit to fulfill multiple functional requirements without adding separate systems.
Solution Approach 2:
The control system achieves flexibility through dynamic control of the backflow prevention circuit's enable/disable state. The disabling circuit allows the system to adapt its behavior based on operational mode, transforming a rigid safety-critical system into a flexible multi-functional control 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
Enables the working machine to be made multifunctional by allowing the blade to be freely moved up and down, preventing machine body fall due to its own weight.
Implementation Method 1
controls the supply of a working fluid to an actuator that drives a driven object by a pilot signal of an operation system
Implementation Method 2
preventing a flow of the working fluid in a direction to move the driven object from the second position to the first position using a backflow prevention circuit
Data Source
AI summary
The method for controlling a working machine controls the supply of a working fluid to an actuator that drives a driven object by a pilot signal Si0 of an operation system generated according to the operation of an operation device, thereby moving the driven object bidirectionally between a first position and a second position. The method for controlling the working machine includes preventing a flow of the working fluid in the direction to move the driven object from the second position to the first position by a backflow prevention circuit. The method for controlling the working machine is characterized by further including disabling the backflow prevention circuit by the pilot signal Si0 generated during a specific operation, thereby allowing the flow of the working fluid in the direction to move the driven object from the second position to the first position.