Loading Machine Control Device Azimuth-Based Dumping Safety
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Solution Overview
Problem
Existing loading machine control systems struggle to prevent earth from spilling when attempting to start the dumping operation before the bucket reaches the loading point, leading to inefficiencies in cycle time and potential accidents.
Innovation Solution
A control device that receives dumping operation signals and prohibits the dumping operation when the swing body's azimuth direction is within a specific first region, allowing the operation only when it enters a second region, ensuring the bucket is properly aligned with the loading point before dumping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the dumping operation is started before the bucket reaches the loading point to shorten cycle time, then productivity is improved, but earth may spill from the loading object causing safety issues and loss of material
Solution Approach 1:
The control device performs preliminary assessment of the swing body's azimuth direction before allowing the dumping operation. By checking whether the azimuth is within the predetermined safe range, the system prepares and validates conditions in advance, enabling early dumping initiation while ensuring safety through pre-verification of positional conditions.
Solution Approach 2:
The control device continuously monitors the azimuth direction of the swing body and uses this feedback information to dynamically control the dumping operation. The dumping command is permitted or prohibited based on real-time feedback of the swing body's angular position, ensuring the operation only proceeds when safety conditions are met.
2Reliability
If the dumping operation is restricted to wait until the bucket reaches the loading point to ensure safety, then reliability is improved, but cycle time increases reducing productivity
Solution Approach 1:
The control system dynamically adjusts the dumping operation timing based on the real-time azimuth direction of the swing body. Instead of a fixed waiting period, the system continuously evaluates the angular position and permits dumping as soon as the azimuth enters the predetermined safe range, optimizing the timing between safety requirements and productivity goals.
3Ease of operation
If the control device allows operator input for dumping operation in automatic loading control, then ease of operation is improved, but risk of earth spilling increases if azimuth control is not implemented
Solution Approach 1:
The control device applies preliminary anti-action by prohibiting the dumping operation when the swing body's azimuth is outside the predetermined safe range. This preventive measure blocks potentially harmful dumping actions before they can occur, while still allowing operator input when conditions are safe, thus eliminating earth spilling risk without completely restricting operator control.
Data Source
AI summary
A control device outputs an operation signal of a work equipment and a swing body for moving a work equipment to a loading point when receiving a loading command signal. The control device does not output a dumping operation signal for causing the bucket to dump earth in a case where an azimuth direction in which the swing body faces is within a first region from a starting point azimuth direction to a predetermined reference azimuth direction, the starting point azimuth direction being an azimuth direction in which the swing body faces when the loading command signal is received. The control device outputs the dumping operation signal in a case where the azimuth direction is within a second region from the reference azimuth direction to an end point azimuth direction in which the swing body faces when the work equipment is positioned at the loading point.