Crane Performance Line Overlay for Load Movement Visualization
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Solution Overview
Problem
Existing crane camera systems and safety mechanisms cannot determine the extent to which a suspended load can be moved within the operation limit range, especially when the boom is extended and the derricking angle is reduced, and they fail to display the actual movement of the suspended load on the photographed image.
Innovation Solution
A performance line display unit equipped with an imaging device near the crane's leading end, a display, and a performance line arithmetic part that calculates and overlays the maximum operation radius and limit performance lines onto the displayed image, allowing operators to visualize the safe and movable range of the suspended load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a camera system displays the moving range of the leading end portion of the boom, then the operator can see the safe condition range, but the system cannot determine how far a suspended load can be moved within the operation limit range when the boom is extended and the derricking angle is reduced
Solution Approach 1:
The patent introduces a performance line arithmetic unit as an intermediary component that calculates the operation limit range based on boom length and derricking angle, and a display unit that overlays the performance line on the photographed image. This intermediary system bridges the gap between the simple camera system and the need for complex safety information, providing the suspended load movement range without requiring a complete system redesign
Solution Approach 2:
The performance line display unit serves multiple functions: it displays the photographed image from the camera, overlays the operation limit range (performance line), and provides real-time safety information. By making the display system multi-functional, the patent resolves the contradiction by adding information capability without requiring separate dedicated systems
2Loss of information
If a safety mechanism displays the rotation axis position and operation limit line, then the operator can see the stable and unstable zones, but the mechanism cannot display the actual movement of the suspended load on the photographed image
Solution Approach 1:
The patent merges the photographed image from the camera with the calculated performance line (operation limit range) into a single composite display. This combination allows the operator to see both the actual visual scene and the safety boundaries simultaneously, providing visual feedback on load position without requiring the operator to switch between multiple displays or interpret separate information sources
Solution Approach 2:
The patent overlays the performance line information onto the two-dimensional photographed image, adding a third dimension of information (safety boundary data) to the visual display. This dimensional enhancement provides comprehensive safety information while maintaining the intuitive visual nature of the photographed image
Data Source
AI summary
A performance line display unit includes an imaging device which is attached near a leading end of an extensible boom provided on a rotation platform rotatably placed on a vehicle of a crane, a display configured to display an image imaged by the imaging device, and a performance line arithmetic part configured to obtain a performance line regarding a suspended load maximum performance of a crane, wherein the performance line arithmetic part is configured to overlap the performance line with a position of the image corresponding to the obtained performance line to be displayed on the display.