Segmented Accumulator System for Shovel Swing Hydraulic Pressure Management
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Solution Overview
Problem
The existing swing hydraulic motor control systems require a large-capacity accumulator to store working oil, leading to high pressure requirements, which can result in insufficient oil release during swing acceleration if the accumulator is under-pressurized due to insufficient oil storage.
Innovation Solution
A shovel with multiple accumulators connected between the swing hydraulic motor and control valve, each with separate on-off valves that open and close based on oil pressure, allowing for staggered accumulation and release timing to manage pressure effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single large-capacity accumulator is used to store working oil during swing deceleration, then the accumulator can store sufficient working oil, but the system requires high pressure which may result in insufficient oil release during swing acceleration if the accumulator is under-pressurized
Solution Approach 1:
The single accumulator is divided into multiple accumulators (first accumulator and second accumulator). Each accumulator has its own on-off valve and can operate independently. This segmentation allows the system to store working oil in multiple smaller units rather than relying on a single large accumulator, enabling more flexible pressure management and reliable oil release during swing acceleration.
2Device complexity
If a single accumulator is used, then the structure is simple, but a large-capacity accumulator is required which increases system complexity and pressure requirements
Solution Approach 1:
The accumulator system is segmented into multiple smaller accumulators instead of one large accumulator. This reduces the pressure requirements for each individual accumulator while maintaining the total storage capacity. The system complexity increases slightly due to additional valves, but the overall system becomes more reliable and easier to manage.
Solution Approach 2:
On-off valves are introduced as intermediary components between the accumulators and the swing hydraulic motor. These valves control the flow of working oil, enabling precise pressure management and timing control during swing deceleration and acceleration phases.
3Productivity
If multiple accumulators with separate on-off valves are used, then pressure management and oil release timing are improved, but the device complexity increases
Solution Approach 1:
The system uses multiple accumulators with separate on-off valves to enable independent control of each accumulator. This segmentation improves energy recovery efficiency by allowing staggered accumulation and release timing, optimizing the hydraulic motor performance during swing operations.
Solution Approach 2:
The multiple accumulators operate in a periodic manner with staggered timing. During swing deceleration, accumulators accumulate working oil at different times. During swing acceleration, they release oil in a coordinated sequence. This periodic action optimizes energy recovery and delivery to the hydraulic motor.
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 allows for efficient accumulation and release of working oil, enabling quicker pressure increase during deceleration and flexible high-pressure release during acceleration, enhancing energy efficiency and operational flexibility.
Implementation Method 1
a plurality of accumulators connected between the swing hydraulic motor and the control valve, and configured to accumulate the working oil on a braking side of the swing hydraulic motor at a time of a swing deceleration
Implementation Method 2
the on-off valves open and close according to a pressure of the working oil of the swing hydraulic motor
Data Source
AI summary
A shovel may be provided with a main pump, hydraulic actuators including a swing hydraulic motor, a control valve that controls a flow of a working oil between the main pump and the hydraulic actuators, and two accumulators connected between the swing hydraulic motor and the control valve. The two accumulators can respectively release the working oil at an upstream of the main pump.