Excavator Attachment Pressure Control for Back Lift Stability
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Solution Overview
Problem
Automatically moving attachments on shovels can cause instability and safety concerns due to phenomena like back lift, which existing technologies have not adequately addressed.
Innovation Solution
The implementation of a stabilization control system using a processing circuitry that controls the movement of the attachment by relieving pressure in the boom cylinder's bottom-side oil chamber, thereby reducing instability and enhancing safety during automatic operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automatic movement control is implemented without stabilization, then productivity and automation extent are improved, but stability and safety deteriorate due to back lift phenomena
Solution Approach 1:
The control circuitry continuously monitors the movement state of the attachment and automatically adjusts the boom cylinder pressure in real-time to counteract back lift phenomena, creating a closed-loop feedback system that maintains stability during automatic operation
Solution Approach 2:
The system dynamically changes the pressure parameter in the boom cylinder's bottom-side oil chamber based on the attachment's movement state, adjusting hydraulic pressure to prevent instability and back lift during automatic movement
2Speed
If attachment movement is unrestricted for productivity, then operation speed is improved, but harmful factors increase due to instability and operator anxiety
Solution Approach 1:
The control system uses real-time feedback from movement state detection to automatically regulate boom cylinder pressure, ensuring that high-speed operation does not compromise safety or generate harmful instability effects
Solution Approach 2:
The system applies preliminary counter-actions by adjusting hydraulic pressure before instability phenomena fully develop, preventing back lift and oscillation from occurring during rapid attachment movement
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The stabilization control system effectively limits the movement of the attachment, reducing instability and anxiety for operators and bystanders, thereby improving the safety and stability of the shovel during automatic operation.
Implementation Method 1
The processing circuitry is configured to automatically move the attachment in such a manner as to relatively reduce the movement of the attachment
Data Source
AI summary
A shovel includes a lower traveling structure, an upper swing structure swingably mounted on the lower traveling structure, an attachment, and processing circuitry. The attachment includes a boom attached to the upper swing structure, an arm attached to the distal end of the boom, and an end attachment attached to the distal end of the arm. The processing circuitry is configured to automatically move the attachment in such a manner as to relatively reduce the movement of the attachment.