Mini Excavator Accumulator Layout for Protected Compact Installation
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Solution Overview
Problem
Small hydraulic excavators face challenges in compactly integrating accumulators due to limited space and the need for protection from external forces during operations like excavation, as conventional techniques require increased counterweight size and are not applicable to mini excavators with restricted dimensions.
Innovation Solution
The accumulator is disposed along a longitudinal board member within the main frame, protected by a valve block and positioned between the longitudinal board member and the valve block, allowing for efficient use of limited space and protection from external forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the upper structure and track roller assembly are separated into independent swingable units, then the shovel can achieve compact configuration for narrow sites, but the structural complexity increases
Solution Approach 1:
The upper structure is divided into multiple independently swingable modules: the track roller assembly can swing relative to the upper frame, and the upper structure itself can swing relative to the track. This segmentation allows each module to be positioned independently to achieve compact configurations while maintaining structural integrity through standardized connection interfaces.
Solution Approach 2:
The patent implements dynamic positioning capabilities where the track roller assembly and upper structure can swing to different angles based on operational requirements. This dynamic adjustment allows the shovel to transition between extended working configurations and compact storage configurations, optimizing space utilization without permanent structural modifications.
2Length of stationary object
If the track roller assembly is positioned at the rear end of the upper frame, then the overall width is reduced for narrow sites, but the track roller assembly becomes prone to collision with obstacles
Solution Approach 1:
The track roller assembly is equipped with active swing capabilities that allow it to dynamically adjust its position and orientation in response to detected obstacles or changing work conditions. This dynamic positioning enables the assembly to avoid collisions by swinging away from obstacles while maintaining its compact rear-end positioning for narrow site operations.
Solution Approach 2:
The system incorporates sensors and control mechanisms that detect obstacles and automatically trigger swing movements of the track roller assembly. This feedback-based control system allows the assembly to respond to environmental conditions in real-time, reducing collision risk while maintaining the space-efficient rear-end positioning.
3Stability of the object's composition
If a large-sized counterweight is installed to ensure stable operation, then stability is improved, but the shovel cannot enter narrow construction sites
Solution Approach 1:
The counterweight is designed with swing capabilities that allow it to dynamically adjust its position relative to the upper frame. During operational phases, the counterweight can be positioned to maximize stability. When entering narrow sites, the counterweight can be swung to a retracted or folded position, reducing the overall envelope of the shovel to fit through tight spaces while maintaining stability through active positioning during work.
Solution Approach 2:
The counterweight structure serves multiple functions: it provides ballast for stability during operation, can be repositioned to reduce width for narrow site access, and may incorporate additional functional elements. This multi-functionality allows the same component to address both stability requirements and space constraints without requiring separate dedicated structures.
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 enables the placement of accumulators in small hydraulic excavators with limited installation space, ensuring effective energy recovery and protection during operations, while also reducing pipe length and optimizing device arrangement.
Implementation Method 1
a hydraulic cylinder (22) for extending and retracting
Data Source
Figure 1
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AI summary
To provide a small hydraulic excavator, which even may have an upperstructure formed such that at least its rear end swings within a body width range and having a limited installation space for devices, that allows an accumulator to be disposed and allows the accumulator to be protected from external force generated during work. The present invention relates to a rear small-swing type mini excavator that includes an accumulator 30 accommodating and recovering potential energy and hydraulic energy used by at least one of drives of an undercarriage 1, an upperstructure 2 formed such that its rear end swings within the body width range of the undercarriage 1, and a working device 3. In the rear small-swing type mini excavator, the accumulator 30 is disposed between a valve block 26 and a front longitudinal board 41 of a longitudinal board member included in a main frame 10 along the front longitudinal board 41, and a pipe connected to the accumulator 30 and the valve block 26 is disposed closer to the accumulator 30 and the valve block 26.