Boom Control Circuit With Regeneration Passage for Consistent Lowering
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Solution Overview
Problem
Conventional boom control systems in construction machines face operability issues due to complex valve switching and potential shocks during mode transitions, especially when switching from normal to float working modes, leading to discomfort and inefficiencies in lowering operations.
Innovation Solution
A boom control device with a control valve that includes a discharge valve passage, a regeneration valve passage with a check valve, and a supply valve passage, allowing for unified lowering control across both normal and float working modes by selectively using hydraulic oil from the pump, and featuring regions for controlled oil flow, ensuring consistent operability and energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a dedicated switching valve for float work is provided apart from the control valve, then float work can be performed, but the number of valves increases and valve switching control is required, leading to complicated operation
Solution Approach 1:
The patent merges the float work function into the existing control valve by providing a float work port that communicates with the rod end oil chamber when the spool is in the neutral position. This eliminates the need for a dedicated switching valve and simplifies operation, as the float work capability is integrated into the normal control valve structure without requiring separate valve switching.
Solution Approach 2:
The control valve is designed to perform multiple functions: normal lowering control, float work, and boom support. The spool valve can be positioned to achieve different oil passage connections, allowing the same valve to serve both normal working mode and float working mode without requiring additional dedicated valves for each function.
2Adaptability or versatility
If different valves are used for lowering control in normal work and float work, then both modes can be supported, but the lowering control becomes different between modes, causing operator discomfort and potential shocks
Solution Approach 1:
The patent uses a single control valve for both normal lowering control and float work lowering control. The spool valve's neutral position creates a communication passage between the head end oil chamber and rod end oil chamber, enabling float work lowering control through the same valve used for normal operations, ensuring consistent operability across different working modes.
3Adaptability or versatility
If mode switching is performed from normal working mode to float working mode during lowering operation with bucket in air, then float work can be enabled, but oil passage switching occurs causing shock
Solution Approach 1:
The patent prepares the oil passage configuration in advance by designing the spool valve with a neutral position that already establishes communication between the head end and rod end oil chambers. This preliminary configuration allows smooth transition to float work mode without abrupt oil passage switching, as the passage is already established when the spool is in neutral position, preventing shock during mode transitions.
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
The solution enables smooth and unified lowering operations in both working modes without valve passage switching, improving operability and workability while maintaining energy efficiency by controlling hydraulic oil supply effectively.
Implementation Method 1
a regeneration valve passage with a check valve that allows the hydraulic oil in the head end oil chamber to be supplied to a rod end oil chamber
Implementation Method 2
supply of hydraulic oil (pressurized oil) from the hydraulic pump
Data Source
AI summary
To perform a work with the same operability under a dead weight of a front work equipment in any of a float work and a normal work, when a bucket descends in the air, and after contacting the ground, to perform a work with the operability being maintained as it is when performing the float work, and to perform a work while pressurized hydraulic fluid is supplied from a hydraulic pump when performing the normal work. A lower-ing control during a float working mode is performed in a valve passage state in a first region at which the lowering control is performed under the dead weight of the from work equip-ment without being supplied with hydraulic fluid from the hydraulic pump, regardless of whether or not the bucket is in contact with the ground, and the lowering control during a normal working mode is performed in a valve passage state at the first region in a non-ground-contacting state and at a second region in which the hydraulic fluid can be supplied from the hydraulic pump in a ground-contacting state.