Crane Load Positioning via Automatic Coordinate Storage
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Solution Overview
Problem
Precise positioning of a crane's hoisting member above the center of a load is time-consuming and challenging, often resulting in load swinging during hoisting, and estimating the easiest load to fetch from a storage is difficult with existing methods.
Innovation Solution
A method that automatically detects load detachment, stores coordinate information, and uses a positioning switch to guide the crane to the most advantageous load position for precise and swift hoisting, minimizing swinging by controlling the hoisting member to the previously recorded coordinates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If precise positioning of the hoisting member above the load center is performed manually, then positioning accuracy is improved, but time consumption increases and load swinging occurs
Solution Approach 1:
The system stores coordinate information of the load center in advance during the unloading phase. When fetching the load, the crane automatically retrieves these pre-stored coordinates and positions itself above the load center without manual intervention, eliminating time-consuming manual positioning while maintaining accuracy.
Solution Approach 2:
The system uses location measurement devices to detect the actual position of the hoisting member and compares it with the stored load center coordinates. This feedback mechanism enables automatic correction and precise positioning, reducing both time and swinging while maintaining high accuracy.
2Measurement precision
If manual positioning above load center is performed, then positioning accuracy is improved, but load swinging during hoisting increases
Solution Approach 1:
The system continuously monitors the position of the hoisting member using location measurement devices and compares it with the stored load center coordinates. This real-time feedback enables automatic position correction, ensuring the hoisting member is precisely above the load center before hoisting begins, thereby eliminating load swinging.
Solution Approach 2:
The system replaces manual mechanical positioning with an automated control system that uses electronic coordinates and automated drive mechanisms. This substitution eliminates the imprecision and delays of manual operation, achieving accurate positioning that prevents load swinging.
3Extent of automation
If coordinate information is stored manually, then automation level is improved, but operation complexity increases
Solution Approach 1:
The system automatically stores coordinate information during the unloading phase without requiring manual intervention. The control system self-manages the coordinate storage and retrieval processes, reducing operational complexity while maintaining high automation levels.
Solution Approach 2:
The system performs preliminary automatic storage of load center coordinates during unloading. This pre-stored information is then automatically retrieved and used for positioning during load fetching, eliminating the need for manual coordinate entry and simplifying operations while maintaining automation.
Data Source
AI summary
A method positions a load and fetches a positioned load or stacks loads with a crane having location measurement arranged thereto. The method includes taking a load to a selected position; detecting the unloading of the load mainly automatically; storing coordinate information of the load position mainly automatically into the memory of the crane or its control; when fetching a load or adding loads to a stack, activating, at a selected first time instant, a positioning switch arranged in the crane and connected to the memory, whereby coordinates of a load or stack most advantageously positioned relative to the movement of the crane are selected, after which the crane begins to move to said coordinates; and then hoisting or lowering the load at the selected coordinates, and at a selected second time instant, deleting the coordinate information associated with the position of the load from the memory.