Hydraulic Circuit Swing Device Stability Control
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Solution Overview
Problem
Conventional hydraulic circuits for construction equipment often result in abrupt operation of swing devices when switching valves for traveling and working devices are shifted, compromising manipulation and safety.
Innovation Solution
A hydraulic circuit design that includes a second valve with an orifice in its spool to control the flow path between the signal line and the tank line, preventing abrupt shifting by discharging pressure and maintaining signal pressure only when necessary, thereby stabilizing the confluence switching valve and preventing abrupt rotation of swing devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a confluence switching valve is used to supply hydraulic fluid from a hydraulic pump to working devices when switching valves for traveling and working devices are shifted, then the hydraulic fluid can be supplied smoothly to working devices, but abrupt operation of swing devices occurs when switching valves are shifted in a state that the confluence switching valve has been shifted
Solution Approach 1:
A second valve is introduced as an intermediary component between the signal line and tank line. This valve controls the discharge of pressure from the signal line to the tank line, mediating the interaction between the confluence switching valve and the hydraulic system. By regulating pressure discharge through this intermediary valve, the system achieves smooth operation of swing devices while maintaining the hydraulic fluid supply efficiency provided by the confluence switching valve.
2Adaptability or versatility
If switching valves for traveling and working devices are shifted simultaneously, then the hydraulic system can operate in multiple modes, but abrupt rotation of swing devices occurs compromising manipulation and safety
Solution Approach 1:
The second valve is positioned to preemptively counteract the harmful effect of abrupt pressure changes. When switching valves are shifted, the second valve controls the pressure discharge in advance, preventing the formation of abrupt pressure differentials that would cause sudden swing device rotation. This preliminary anti-action maintains system versatility while eliminating the harmful abrupt movements.
Solution Approach 2:
The second valve provides beforehand cushioning by regulating the pressure discharge from the signal line. When the confluence switching valve shifts position, the second valve gradually dissipates pressure through controlled discharge to the tank line, cushioning against sudden pressure changes. This prior cushioning effect prevents abrupt swing device operation while maintaining the ability to switch between multiple operation modes.
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 design effectively prevents abrupt operation of swing devices during shifting, enhancing the safety and control of working devices by ensuring smooth transitions and reducing the risk of sudden movements.
Implementation Method 1
a second valve (22) installed in a flow path between the first valve (21) and the tank line, shifted to open the flow path to discharge pressure formed in the signal line (17) for the confluence switching valve (9) to the tank line
Implementation Method 2
A hydraulic circuit design that includes a second valve with an orifice in its spool to control the flow path between the signal line and the tank line
Data Source
AI summary
A hydraulic circuit for construction equipment is disclosed, which can prevent an abrupt rotation of a swing device when a switching valve for the swing device is shifted in a state that switching valves for a traveling device and a working device have been shifted.