Lorry Crane Stability Control via Support Leg Force Feedback
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Solution Overview
Problem
Current lorry crane stability monitoring systems do not account for the stabilizing moment provided by the load on the lorry, leading to unnecessary reduction in lifting capacity and potential overloading risks due to inadequate adaptation of the maximum allowed lifting moment.
Innovation Solution
Incorporating sensors to measure the horizontal extension length and force of support legs, and an electronic regulating device that adjusts the maximum allowed lifting moment based on the stabilizing moment from both the lorry and its load, ensuring proper safety against tipping while optimizing lifting capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the maximum allowed lifting moment is reduced to ensure lorry stability, then the stability of the lorry is improved, but the lifting capacity of the crane is reduced
Solution Approach 1:
The system dynamically adjusts the maximum allowed lifting moment based on real-time sensor data about load position, support leg extension, and lorry orientation. This allows the lifting capacity to vary adaptively rather than being fixed conservatively, optimizing both stability and productivity
Solution Approach 2:
Sensors continuously monitor the actual stabilizing moment from the load and feed this information back to the control system. The control system uses this feedback to recalculate and adjust the maximum allowed lifting moment, enabling precise adaptation that prevents unnecessary capacity limitations while maintaining stability
2Measurement precision
If sensors are added to measure support leg force and extension, then the precision of stability calculation is improved, but the device complexity increases
Solution Approach 1:
The lorry's existing hydraulic support leg system serves dual purposes: it provides structural support and simultaneously acts as a measurement system through sensors that detect force and extension. This eliminates the need for separate measurement apparatus and leverages existing infrastructure for monitoring
Solution Approach 2:
The support legs perform multiple functions: mechanical support, positioning, and sensing. By integrating sensors into the existing support leg mechanism, the system achieves precise measurement capabilities without adding separate dedicated measurement devices, thereby reducing overall system complexity
Data Source
AI summary
The invention relates to a lorry provided with a hydraulic crane (20) and support legs (41-44), the respective support leg being manoeuvrable by means of a force member (6) to an active support position. An electronic regulating device (30) checks whether one or more stability conditions are fulfilled with a lifting moment of the crane corresponding to a maximum allowed value for the lifting moment of the crane and establishes a reduced value for the maximum allowed lifting moment if said stability conditions are not fulfilled, taking into account the horizontal extension length of the respective support leg that is in the active support position, the slewing angle of the column (21) of the crane in relation to the chassis (3) of the lorry, and the force exerted by the force member of the respective support leg that is in the active support position and is not included in the prevailing tipping line of the lorry.