Excavator Parameter Correction for Extension Arm Attachment
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Solution Overview
Problem
Hydraulic excavators with extension arms require additional calibration of working equipment parameters when the extension arm is attached or detached, leading to increased time and workload, and lack of calibration before and after these changes affects the accuracy of the blade edge position.
Innovation Solution
A work machine with a swing angle detector, attitude calculating unit, and working equipment parameter correction unit that acquires and corrects parameters based on the extension arm's information, eliminating the need for recalibration when switching between normal and modified configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If second working equipment (extension arm) is attached to enlarge workable area, then workable area is enlarged, but additional calibration is required which increases time and workload
Solution Approach 1:
The system pre-stores multiple sets of working equipment parameters corresponding to different attachment configurations (normal configuration, extension arm attached, extension arm detached). When configuration changes occur, the system automatically switches to the pre-prepared parameter set without requiring calibration, thus resolving the contradiction between enlarged workable area and calibration time loss.
2Measurement precision
If calibration is performed to ensure accurate blade edge position detection, then positioning accuracy is improved, but calibration workload increases when switching between normal and modified configurations
Solution Approach 1:
The system automatically detects the current working equipment configuration (normal or with extension arm) and autonomously selects and applies the corresponding pre-stored parameter set. This self-service mechanism eliminates the need for manual calibration operations, maintaining high positioning accuracy while reducing calibration workload to zero.
3Manufacturing precision
If manual calibration is required after attaching or detaching extension arm, then parameter accuracy is maintained, but operational efficiency decreases due to switching operations
Solution Approach 1:
The system continuously monitors the working equipment configuration state and provides feedback to automatically trigger parameter set switching. When the extension arm attachment state changes, the system detects this change and automatically switches to the appropriate parameter set, maintaining parameter accuracy while eliminating manual calibration steps and improving operational efficiency.
Data Source
AI summary
A work machine includes: first working equipment with first working equipment parameter; second working equipment including a parallel link and being attachable to the first working equipment; a swing angle detector that detects swing angle information of the first working equipment; an attitude calculating unit that calculates an attitude of the first working equipment based on the detected swing angle information of the first working equipment; a working equipment parameter storage that stores the first working equipment parameter defined for a component of the first working equipment; a correction information acquiring unit that acquires information on the second working equipment as correction information; and a working equipment parameter correction unit that corrects the first working equipment parameter based on the correction information on the second working equipment acquired by the correction information acquiring unit.