Work Machine Blade Pitch Control for Penetration Force
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Solution Overview
Problem
It is challenging for operators to accurately adjust the pitch angle of a blade in work machines according to the work load, leading to reduced efficiency due to insufficient penetration force, which can cause the front portions of crawler belts to lift up during low-load operations.
Innovation Solution
A work machine equipped with a pitch actuator, sensors, and a controller that detects the penetration force of the blade tip and automatically adjusts the pitch angle by tilting the blade forward when the penetration force is insufficient, ensuring appropriate pitch angles based on work load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the pitch angle is smaller (blade tilted backward) to reduce digging resistance and improve digging performance, then the penetration force in downward direction becomes insufficient, causing front portions of crawler belts to lift up
Solution Approach 1:
The blade pitch angle is made dynamically adjustable during operation. The pitch actuator automatically changes the pitch angle based on real-time detection of penetration force or blade movement amount, allowing the system to adapt to varying work conditions and maintain optimal performance without manual intervention.
Solution Approach 2:
The control system uses feedback from sensors that detect penetration force or blade movement amount to automatically adjust the pitch angle. When penetration force is insufficient or blade movement is small, the system increases the pitch angle to enhance penetration force, and vice versa, creating a closed-loop control system.
2Ease of operation
If manual adjustment of pitch angle is used, then the operator can control the blade position, but it is not easy to accurately select the appropriate pitch angle according to work load
Solution Approach 1:
The system performs self-adjustment of the pitch angle based on sensor feedback. The control unit automatically determines the appropriate pitch angle by monitoring penetration force or blade movement amount, eliminating the need for manual judgment and adjustment by the operator, thereby achieving both ease of operation and precision.
Solution Approach 2:
The manual mechanical adjustment system is replaced with an automated control system that uses sensors and a control unit to adjust the pitch angle. This substitution of mechanical manual control with an automated sensing and control system enables precise pitch angle selection according to actual work load conditions.
Data Source
AI summary
A work machine includes a vehicle body, a blade supported so as to be rotatable about a pitch axis with respect to the vehicle body, a pitch actuator connected to the blade, a first sensor, and a controller. The pitch actuator causes the blade to perform a pitch motion about the pitch axis in a forward tilt direction and a backward tilt direction. The first sensor detects a first parameter relating to a penetration force of a blade tip of the blade in a downward direction. The controller determines whether the penetration force is insufficient based on the first parameter, and controls the pitch actuator to cause the blade to perform the pitch motion in the forward tilt direction upon determining that the penetration force is insufficient.