Crane Suspended Load Calculation with Boom Length Correction
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Solution Overview
Problem
Existing suspended load calculation devices in cranes fail to accurately account for variations in boom length, leading to discrepancies between actual and displayed loads due to the use of a single correction value table for different boom derricking angles, which cannot absorb errors caused by boom length changes.
Innovation Solution
A suspended load calculation device that includes a detection unit, a calculation unit, an acquisition unit, and a storage unit, which acquires and corrects the suspended load using a correction value table specific to each boom length, with linear interpolation used when the exact correction value is not stored, ensuring accurate load calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single correction value table is used for different boom lengths, then the device complexity is reduced, but the measurement precision of suspended load deteriorates due to errors caused by boom length variations
Solution Approach 1:
The patent divides the single correction value table into multiple segment tables, each corresponding to a specific boom length. This segmentation allows the system to select the appropriate correction table based on the current boom length, thereby improving measurement precision without significantly increasing overall system complexity.
Solution Approach 2:
The patent changes the parameter of boom length to select different correction value tables. By making the boom length a key parameter for table selection, the system adapts the correction values to match the actual boom configuration, resolving the accuracy issue while maintaining manageable complexity through parameter-based organization.
2Measurement precision
If multiple correction value tables are created for different boom lengths, then the measurement precision of suspended load is improved, but the device complexity increases due to multiple tables and selection logic
Solution Approach 1:
The patent implements a dynamic selection mechanism that automatically chooses the appropriate correction value table based on the current boom length. This dynamic approach allows the system to adapt to different boom configurations without requiring manual intervention or complex configuration management, balancing precision improvement with operational simplicity.
Solution Approach 2:
The system performs self-service by automatically selecting the correct correction table based on the detected boom length. The control unit autonomously matches the current boom length with the corresponding correction table, eliminating the need for manual table selection or complex user configuration, thus managing the increased complexity internally.
3Adaptability or versatility
If linear interpolation is implemented for missing correction values, then the adaptability of the system to different boom lengths is improved, but the calculation complexity increases
Solution Approach 1:
The patent applies linear interpolation as a partial solution when exact correction values are unavailable. Instead of requiring complete correction tables for every possible boom length, the system uses interpolation to estimate values between known data points, providing adequate adaptability without the need for exhaustive correction data for all possible configurations.
Data Source
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Figure 3A~3C
AI summary
The present invention provides a technology for improving accuracy of a display load of a suspended load hung by a crane (100). A suspended load calculation device (600) includes a detection unit configured to detect information for specifying a load suspended by a crane (100), a calculation unit (304) configured to calculate the suspended load based on a value detected by the detection unit, and an acquisition unit configured to acquire a boom length, in which the calculation unit (304) corrects the suspended load by a correction value corresponding to the boom length acquired by the acquisition unit.