Dual Operator Control for Load Moving Device Positioning
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Solution Overview
Problem
Large load moving devices, such as crawler cranes, face challenges in safely and effectively positioning loads due to the distance between the control station and the load, leading to difficulties in communication and increased error-prone acoustic messaging, as the crane operator often lacks a clear view of the load for precise positioning.
Innovation Solution
A method involving two operators using a permanently installed and a mobile control unit to transfer control of the load moving device, allowing the operator with a better view of the load to take over precise positioning, with mandatory control commands for transfer and emergency stop functions to ensure safety and prevent misunderstandings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the crane operator controls the load moving device from the control station, then the operator can maintain overview of other load movements, but the operator cannot see the load for precise positioning
Solution Approach 1:
The control function is segmented between two operators: the crane operator maintains overview from the control station while a second operator positioned near the load handles precise positioning. This division allows each operator to focus on their respective strength without compromising the other function.
Solution Approach 2:
A mobile control unit serves as an intermediary device that enables the second operator to control the load moving device from a position with direct view of the load. This intermediary tool bridges the gap between the control station and the load, allowing precise positioning while maintaining the original control architecture.
2Measurement precision
If a guide uses hand signals to communicate with the crane operator, then the guide can be positioned close to the load, but communication becomes error-prone and difficult to interpret
Solution Approach 1:
The mechanical hand signal communication system is replaced with an electronic control system. The mobile control unit transmits electronic control signals directly to the load moving device, eliminating the need for manual gestures and their inherent ambiguity. This substitution ensures reliable and precise communication between the second operator and the machinery.
3Measurement precision
If the crane operator uses radio remote control for fine positioning, then the operator can control the load directly, but the operator loses overview of other load movements
Solution Approach 1:
Instead of one operator switching between overview and positioning tasks, the control function is permanently segmented between two operators. The crane operator remains at the control station maintaining overview, while the second operator uses the mobile control unit exclusively for precise positioning when needed.
Solution Approach 2:
The solution adds a spatial dimension to the control architecture by introducing a mobile control unit that operates independently from the fixed control station. This allows control functions to be distributed across different spatial locations simultaneously, with each operator positioned optimally for their specific task.
4Productivity
If control is transferred between operators without control commands, then the mobile operator can respond quickly, but unauthorized control transfer may occur
Solution Approach 1:
The system requires preliminary authorization through control commands before control transfer occurs. The first operator must issue a control command to release control, and the second operator must receive this authorization before taking control. This preliminary action ensures authorized transfer while maintaining operational efficiency.
Data Source
Figure 1
Figure 1
AI summary
The present invention comprises a method for controlling a load-moving device by at least two persons, comprising the steps: controlling the motion of the load-moving device by a first person; transferring control of the motion of the load-moving device to a second person; controlling the load-moving device by the second person. The present invention further relates to a corresponding controller of a load-moving device comprising a first, particularly permanently installed operating unit (10) and a mobile operating unit (20) for controlling the motion of the load-moving device for safe and effective performance of the method.