Hydraulic Valve Circuit for Synchronous Multi-Actuator Flow Control
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Solution Overview
Problem
Traditional hydraulic circuits for working machines like front loaders and shovels face challenges in managing flow rates simultaneously for multiple functions, leading to potential lack of movement synchronicity, especially when one section handles a lower load downward and another a higher load upward, making it complex for operators to distribute flow rates effectively.
Innovation Solution
A control device is introduced in the hydraulic circuit that activates only for specific movement combinations, reducing the passage area to ensure equal flow rate distribution between two uses by using a 2-way 2-position spool and a pressure reducing element, which switches to a choked passage position when upward movement is activated, helping to balance pressures and simplify flow management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If local compensators are added to each section for precise flow rate partition, then movement synchronicity is improved, but system complexity and cost increase
Solution Approach 1:
The patent merges the flow rate management function into a single centralized control device that receives pilot signals from multiple spools and coordinates flow distribution to multiple sections. This eliminates the need for separate local compensators at each section, achieving movement synchronicity through centralized coordination rather than distributed compensation, thereby reducing system complexity while maintaining reliability
Solution Approach 2:
The control device serves multiple functions: it manages flow rate distribution to multiple sections, ensures movement synchronicity, and adapts to different operational modes (single section activation, dual section activation with equal loads, dual section activation with unequal loads). This multi-functional design replaces multiple specialized components with a single versatile device, reducing overall system complexity
2Reliability
If flow rate is distributed equally to two uses activated simultaneously, then movement contemporaneity is improved, but passage area control complexity increases
Solution Approach 1:
The control device automatically adjusts passage areas based on pilot signals received from spools to ensure equal flow rate distribution when two sections are activated simultaneously. The system self-regulates flow distribution without requiring manual intervention from the operator, achieving movement contemporaneity automatically while simplifying operation through automated control logic
Solution Approach 2:
The system uses pilot lines to transmit pressure signals from various sections to the control device, which then adjusts passage areas accordingly. This feedback mechanism enables the control device to sense load conditions and automatically balance flow distribution, ensuring movement contemporaneity without complex manual control
3Ease of operation
If control device activates only for specific movement combinations, then operator complexity is reduced, but system adaptability to all scenarios decreases
Solution Approach 1:
The control device dynamically adapts its operation based on the activation state of different spools. When only one spool is activated, the control device remains inactive and flow distributes normally. When two spools are activated simultaneously, the control device activates and adjusts passage areas to ensure equal flow distribution. This dynamic behavior reduces operator complexity for normal operations while maintaining adaptability for special cases through automatic activation based on operational conditions
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 solution ensures priority activation with minimal system changes and low costs, optimizing flow rate management for applications with multiple uses on working machines by ensuring contemporaneity of movements and reducing operator complexity in fluid control.
Implementation Method 1
a pressure reducing element, which switches to a choked passage position when upward movement is activated, helping to balance pressures
Implementation Method 2
reducing the passage area to ensure equal flow rate distribution between two uses
Data Source
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AI summary
A hydraulic circuit for a working machine, for example a front loader, comprising: a supply line configured so as to receive a supply pressure from a pump associated or associable to the drive distributor; a plurality of spools, each spool being configured to supply said supply pressure in a controlled manner to a corresponding first use and a corresponding second use so as to be able to make a hydraulic actuator of the working machine carry out an upward or downward movement, respectively; a pilot line that passes through all the spools through respective hydraulic passages up to a discharge line; said hydraulic circuit further comprising a control device including a logic element, which can be switched between a free passage position and a choked passage position, wherein the control device further comprise a driving conduit configured to switch the logic element between the free passage position and the choked passage position, said driving conduit being connected to said pilot line onto which a diversion pressure generated by means of a pressure reducing member or by an outer pressure source acts, and which is located at a diversion line, said spools being configured so that when at least one spool of said plurality of spools is in such a position as to make the hydraulic actuator of the working machine carry out the upward movement, a relative passage of the pilot line passing through the spool is closed, so that said logic element is switched from the free passage position to the choked passage position.