Mobile crane suspended load calculation on inclines
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Solution Overview
Problem
Existing mobile crane systems inaccurately calculate the suspended load when operating on an inclined surface, as they rely solely on the derricking angle of the boom, leading to errors in load calculation.
Innovation Solution
The mobile crane system incorporates a derricking force measurement unit, a ground angle acquisition unit, and an actually suspended load calculation unit that uses the boom-to-ground angle to accurately calculate the suspended load, accounting for errors caused by inclines by measuring derricking force and boom-to-ground angle, and adjusting calculations accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the mobile crane calculates suspended load based solely on the derricking angle of the boom, then the calculation method is simple, but the measurement precision is poor when operating on inclined surfaces
Solution Approach 1:
The patent changes the parameter used for load calculation from solely the derricking angle to a combination of the derricking angle and the boom-to-ground angle. This parameter change allows the system to account for inclined surface conditions, thereby improving measurement precision without requiring a complete redesign of the calculation system.
Solution Approach 2:
The patent introduces the boom-to-ground angle as an intermediary parameter that mediates between the derricking angle measurement and the actual suspended load calculation. This intermediary parameter captures the influence of the inclined surface, enabling accurate load calculation while maintaining a relatively simple overall system structure.
2Reliability
If the mobile crane uses traditional load calculation methods, then the device complexity is low, but the reliability is reduced when operating on inclined surfaces
Solution Approach 1:
The patent implements a feedback mechanism by continuously measuring both the derricking angle and the boom-to-ground angle, then using these measurements to recalculate the suspended load. This feedback loop ensures that the load calculation reliably reflects actual operating conditions on inclined surfaces, improving reliability while maintaining manageable system complexity through integrated sensing and computation.
3Measurement precision
If the mobile crane operates on inclined surfaces using conventional methods, then the ease of operation is maintained, but the measurement precision of suspended load is compromised
Solution Approach 1:
The patent enables the crane system to self-correct for inclined surface conditions by automatically measuring the boom-to-ground angle and incorporating this information into the load calculation. This self-service capability maintains ease of operation for the operator while significantly improving measurement precision, as the system autonomously adapts to varying operational conditions without requiring manual intervention.
Data Source
AI summary
There is provided a mobile crane including an undercarriage, turning body turnably supported by the undercarriage, a boom derrickably supported by the turning body, a derricking unit that causes the boom to perform a derricking operation, a derricking force measurement unit that measures a derricking force by which the derricking unit causes the boom to perform the derricking operation, a ground angle acquisition unit that acquires a boom-to-ground angle which is an angle of the boom relative to a ground where the undercarriage is disposed, and an actually suspended load calculation unit that calculates an actually suspended load, based on the derricking force and the boom-to-ground angle.