Work Machine Blade Pitch Control for Leveling and Digging
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Solution Overview
Problem
It is challenging for operators to manually select an appropriate pitch angle for a work machine blade, as the optimal angle varies by work type, affecting both digging and leveling performance.
Innovation Solution
A work machine equipped with a lift frame, pitch actuator, sensor, and controller that automatically adjusts the blade's pitch angle based on detected height, allowing for easy and appropriate adjustment through an automatic control mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pitch angle is increased (blade tilted forward), then leveling performance is improved, but digging resistance increases and digging performance deteriorates
Solution Approach 1:
The blade pitch angle is made dynamically adjustable rather than fixed. The pitch actuator enables the blade to change its pitch angle according to the detected work type, allowing the system to adapt between leveling and digging operations. This resolves the contradiction by making the pitch angle a variable parameter that can be optimized for each specific task.
Solution Approach 2:
The system changes the pitch angle parameter based on detected work conditions. When leveling work is detected, the pitch angle is increased; when digging work is detected, the pitch angle is decreased. This parameter adjustment resolves the technical contradiction by optimizing the pitch angle for the current work type.
2Force
If the pitch angle is decreased (blade tilted backward), then digging resistance is reduced and digging performance is improved, but soil spillage to the rear increases and leveling performance deteriorates
Solution Approach 1:
The blade pitch angle is made dynamically adjustable rather than fixed. The pitch actuator enables the blade to change its pitch angle according to the detected work type, allowing the system to adapt between leveling and digging operations. This resolves the contradiction by making the pitch angle a variable parameter that can be optimized for each specific task.
Solution Approach 2:
The system changes the pitch angle parameter based on detected work conditions. When leveling work is detected, the pitch angle is increased; when digging work is detected, the pitch angle is decreased. This parameter adjustment resolves the technical contradiction by optimizing the pitch angle for the current work type.
3Ease of operation
If manual adjustment of pitch angle is used, then operator control is maintained, but accurate selection of appropriate pitch angle is difficult even for skilled operators
Solution Approach 1:
The system performs self-adjustment of the pitch angle based on automatic detection of work type through sensors. The controller automatically determines the appropriate pitch angle without operator intervention, allowing the system to serve itself in optimizing the pitch angle for current working conditions.
Solution Approach 2:
The system uses sensors to detect work conditions and provides feedback to the controller, which then automatically adjusts the pitch angle. This closed-loop feedback mechanism ensures accurate pitch angle selection based on actual working conditions, resolving the precision problem while maintaining ease of operation.
Data Source
AI summary
A work machine includes a vehicle body, a lift frame rotatably supported around a lift axis with respect to the vehicle body, a blade rotatably supported around a pitch axis with respect to the lift frame, a lift actuator connected to the lift frame and the vehicle body, a pitch actuator connected to the blade and the lift frame, a sensor that detects a height of the blade from a reference height determined based on the vehicle body, and a controller that controls the pitch actuator to change a pitch angle of the blade according to the height of the blade. The lift actuator causes the lift frame to perform a lift motion up and down around the lift axis. The pitch actuator causes the blade to perform a pitching motion around the pitch axis.