Excavator Bucket Height Control for Loading Interference
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Solution Overview
Problem
Existing work machines, such as hydraulic excavators, cannot completely prevent the natural fall of a bucket when waiting for a loaded machine to arrive, leading to potential interference during entry.
Innovation Solution
A work machine with a controller that senses the natural lowering of the bucket and raises it based on the amount of lowering, ensuring the bucket remains at a safe height to avoid interference with incoming loaded machines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pilot operation check valve is provided in the hydraulic circuit to prevent natural fall of the bucket, then the bucket stability is improved, but the natural fall cannot be completely prevented and the bucket may still interfere with the loaded machine
Solution Approach 1:
The control unit proactively raises the bucket before the loaded machine arrives, based on predicted arrival time. This preliminary action prevents the bucket from being in a low position that could cause interference, addressing the limitation of passive check valve approaches
Solution Approach 2:
The system uses feedback from the communication device about loaded machine arrival time and feedback from sensors about bucket position to dynamically adjust bucket height. This closed-loop control ensures the bucket is raised at the appropriate time to avoid interference while maintaining stability
2Object-affected harmful factors
If the bucket is kept at a high position to avoid interference with loaded machines, then the safety is improved, but the response time for loading operations may be reduced
Solution Approach 1:
The bucket position is dynamically adjusted based on the predicted arrival time of the loaded machine. The system transitions between different height states (high, intermediate, low) at appropriate times, optimizing both safety and operational efficiency rather than maintaining a fixed position
Solution Approach 2:
The control unit periodically adjusts the bucket position based on timing information about loaded machine arrival. The bucket is raised to a high position before arrival, maintained during loading, and lowered after loading completes, creating a periodic cycle that balances safety and productivity
Data Source
AI summary
A hydraulic excavator loads a load onto a loaded machine. The hydraulic excavator includes a work implement and a controller. The work implement includes a bucket. The controller senses an amount of natural lowering of the bucket in a stand-by state in which the hydraulic excavator waits for entry of the loaded machine and controls the work implement to raise the bucket based on the amount of natural lowering.