Excavator Bucket Hydraulic Control for Faster Cylinder Speed
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Solution Overview
Problem
The existing hydraulic excavator drive systems, as disclosed in Patent Literature 1, face a challenge in achieving faster speed for the bucket cylinder during operations.
Innovation Solution
The system incorporates a configuration with multiple pumps and control valves that allow simultaneous hydraulic oil supply from multiple sources to the bucket cylinder during specific operations, enabling faster speed by utilizing a controller to manage the movement of control valves and pump allocations based on operational demands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If hydraulic oil is supplied to the bucket cylinder from a single pump, then the system structure is simple, but the speed of the bucket cylinder is slow
Solution Approach 1:
The patent merges multiple hydraulic pumps (first pump, second pump, third pump) to supply hydraulic oil to the bucket cylinder simultaneously. The control system integrates multiple pump outputs through control valves (first bucket control valve, second bucket control valve) to combine hydraulic flows, achieving faster cylinder speed while managing system complexity through coordinated control.
Solution Approach 2:
The system dynamically adjusts which pumps supply the bucket cylinder based on operational conditions. The controller moves control valves to connect different pump outputs to the bucket cylinder depending on whether operations are performed concurrently or alone, optimizing speed dynamically rather than maintaining a fixed configuration.
2Productivity
If hydraulic oil is supplied to the bucket cylinder from multiple pumps, then the speed of the bucket cylinder is faster, but the control complexity increases
Solution Approach 1:
The control system monitors operational conditions and automatically adjusts the configuration of control valves to determine which pumps supply the bucket cylinder. This feedback-based control optimizes productivity by enabling multi-pump operation when needed while simplifying control when single-pump operation suffices, balancing efficiency gains against control complexity.
3Speed
If the third pump supplies hydraulic oil to the slewing motor, then the slewing operation is stable, but the bucket cylinder speed is limited when both operations occur concurrently
Solution Approach 1:
The system dynamically reconfigures pump allocations based on operational demands. When bucket operations are performed alone, the controller enables both the first and third pumps to supply the bucket cylinder for maximum speed. When slewing operations occur concurrently, the system adapts by having the third pump supply the slewing motor while the first pump supplies the bucket cylinder, optimizing performance for each operational scenario.
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 ensures that the bucket cylinder receives hydraulic oil from multiple pumps during solo operations, significantly enhancing its speed and operational efficiency.
Implementation Method 1
a first pump that supplies hydraulic oil to a boom cylinder via a boom control valve
Implementation Method 2
These hydraulic actuators are supplied with hydraulic oil from one or two pumps
Data Source
AI summary
A hydraulic excavator drive system includes: a first pump that supplies hydraulic oil to a boom cylinder via a boom control valve, and supplies the hydraulic oil to a bucket cylinder via a first bucket control valve; a second pump that supplies the hydraulic oil to an arm cylinder via an arm control valve; a third pump that supplies the hydraulic oil to a slewing motor via a slewing control valve, and supplies the hydraulic oil to the bucket cylinder via a second bucket control valve; and a controller that moves one of the first bucket control valve and the second bucket control valve when a bucket excavating operation or a bucket dumping operation is performed concurrently with another operation, and moves both the first bucket control valve and the second bucket control valve when a bucket excavating operation is performed alone.