Edge Protector Height Control for Construction Machines
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Solution Overview
Problem
Self-propelled construction machines face issues with edge protectors digging into loose ground, leading to increased driving resistance, wear, and potential machine standstill, due to the need for additional sensors susceptible to mechanical stresses and increased design complexity.
Innovation Solution
A control unit determines the height and lowering speed of the edge protector relative to the machine frame, generating a control signal to raise the edge protector when sinking into loose ground, eliminating the need for additional sensors and preventing digging, with a lifting device adjusting the edge protector's position to maintain a defined contact with the ground.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the edge protector is lowered to rest on the ground surface with specified contact force, then the drum housing is closed at the sides and the edge protector can follow terrain unevennesses, but the edge protector may dig into loose ground causing increased driving resistance, wear, and potential machine standstill
Solution Approach 1:
The edge protector is designed with dynamic height adjustment capability through the lifting device, allowing it to transition between floating position (reducing digging into loose ground) and lowered position (maintaining contact with ground surface). This dynamic adaptability resolves the contradiction between maintaining stable contact and preventing harmful digging.
Solution Approach 2:
The control unit continuously monitors the position and contact status of the edge protector and automatically activates the lifting device when digging is detected or anticipated. This feedback mechanism enables real-time adjustment to prevent the harmful effects while maintaining operational reliability.
2Reliability
If an additional distance sensor with resilient scanning element is added to detect ground contact, then the edge protector can be prevented from digging into loose ground, but the design complexity increases and the scanning element is subjected to mechanical stresses
Solution Approach 1:
The lifting device acts as an intermediary mechanism between the control unit and the edge protector, enabling indirect detection of ground contact conditions through monitoring the lifting device's operation and the edge protector's position relative to the machine frame, rather than direct mechanical contact sensing.
Solution Approach 2:
The patent replaces the mechanical scanning element-based distance sensor with an electronic detection system that monitors the edge protector's height and lowering speed relative to the machine frame. This substitution eliminates the mechanical stresses on a resilient scanning element while maintaining reliable ground contact detection.
3Ease of operation
If the edge protector is kept in raised position during operation, then the operating drum is accessible and mechanical stress on sensors is reduced, but the drum housing is not closed at the sides and the edge protector cannot follow terrain adjustments
Solution Approach 1:
The lifting device enables dynamic positioning of the edge protector, allowing it to be raised when drum accessibility is needed and lowered when side coverage is required. This dynamic adjustment resolves the contradiction between operational accessibility and protective coverage.
Solution Approach 2:
The edge protector can be periodically raised and lowered based on operational requirements, such as raising during maintenance access needs and lowering during operation requiring side coverage, allowing the system to alternate between the two states as needed.
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
This solution ensures reliable edge protector control without wear-prone components, reduces fuel consumption, and enhances user-friendly operation by automatically adjusting the edge protector's position, preventing sinking into loose ground and maintaining a consistent machine performance.
Implementation Method 1
the edge protector automatically lowers onto the surface of the ground from a raised position under its own weight
Implementation Method 2
A control unit determines the height and lowering speed of the edge protector relative to the machine frame
Data Source
AI summary
A self-propelled construction machine includes a machine frame and an operating drum arranged in a drum housing which is open downwards and is closed on both sides by an edge protector which is adjustable in height. A control assembly determines a reference value for the height of the ground surface relative to the machine frame on which the edge protector rests in a floating position, the height of the edge protector relative to the machine frame and the lowering speed of the edge protector. Furthermore, the control assembly is configured such that the height of the edge protector relative to the machine frame is determined at the point in time at which the lowering speed of the edge protector is less than a specified limit value. Preferred embodiments of the machine furthermore detect the edge protector sinking into the ground, and/or prevent the edge protector from digging into the ground.