Hydraulic Shovel Display System for Precise Blade Edge Positioning
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Solution Overview
Problem
Conventional display systems for hydraulic shovels fail to provide precise digging operations due to the non-parallel orientation of the bucket's blade edge with respect to the target digging surface, leading to inaccuracies in distance measurements and potential over- or under-digging.
Innovation Solution
A display system comprising a position detector, storage unit, and calculation unit that calculates and displays the distance between the target surface and the closest point on the bucket's blade edge, even when not oriented parallel, using a guidance picture that includes a head-on view and side view with distinct color representations for areas closer to the ground or air, enabling precise operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the blade edge of the bucket is not oriented parallel to the target digging surface, then the distance between the blade edge and target surface varies across the widthwise direction, but the conventional display system only shows a single reference distance which leads to inaccurate digging operations
Solution Approach 1:
The patent divides the blade edge into multiple measurement points (first measurement point and second measurement point) across the widthwise direction. Each point has its distance to the target surface independently calculated and displayed, allowing operators to understand the varying distance profile along the blade edge and adjust positioning accordingly.
Solution Approach 2:
The patent transitions from displaying a single reference distance (one-dimensional) to displaying multiple distances at different widthwise positions (two-dimensional distribution). This dimensional expansion provides complete distance information across the blade edge, enabling precise positioning even when the blade edge is not parallel to the target surface.
2Device complexity
If a single reference distance is displayed on the monitor, then the display system remains simple, but it cannot account for variations in distance across the blade edge widthwise direction leading to over- or under-digging
Solution Approach 1:
The system segments the blade edge into multiple measurement points and displays distance information for each point separately. This segmentation approach provides comprehensive distance data without requiring complex 3D visualizations, maintaining display simplicity while improving digging precision.
Solution Approach 2:
The patent introduces measurement points as intermediary elements between the blade edge and the target surface. These measurement points serve as reference markers that bridge the gap between the physical blade edge position and the target surface, enabling accurate distance measurement and display without complicating the overall system architecture.
Data Source
AI summary
A display system in a hydraulic shovel has a calculation unit and a display unit. The calculation unit is configured to calculate a distance between a design surface and a position closest to the design surface among positions of a blade edge of a bucket in a widthwise direction of the blade edge based on positional information for the blade edge and the design surface. The display unit is configured and arranged to display a guidance picture. The guidance picture includes an image showing the positional relationship between the design surface and the blade edge of the bucket, and information indicating the distance between the design surface and the position closest to the design surface.