Hydraulic Shovel Operability Range Boundary Adjustment
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Solution Overview
Problem
Existing hydraulic shovel operability range display devices fail to accurately depict the operable range when the vehicle body is tilted, leading to potential digging errors and ground surface instability due to incorrect boundary angles.
Innovation Solution
A hydraulic shovel operability range display device that calculates and displays the operability range using a global coordinate system, maintaining the boundary between the operability range and underbody area along the vertical direction when the vehicle body is tilted forward, and correcting the boundary angle to at least 90° when tilted backward to prevent acute angles and ground surface crumbling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the boundary between operability range and underbody area is set along the vertical direction in the main vehicle body coordinate system, then the calculation is simple, but the underbody area is incorrectly included in the operability range when the vehicle body is tilted
Solution Approach 1:
The patent changes the reference coordinate system from the main vehicle body coordinate system to the global coordinate system. This parameter change allows the boundary to be correctly defined relative to the ground surface regardless of vehicle body tilt, resolving the accuracy issue while maintaining calculation simplicity through coordinate transformation
Solution Approach 2:
The patent introduces a coordinate transformation as an intermediary between the vehicle body orientation and the operability range calculation. By transforming coordinates from the global system to the vehicle body system, the patent enables accurate boundary determination that accounts for tilt while keeping the calculation process manageable
2Measurement precision
If the boundary is set to maintain vertical direction in global coordinate system when vehicle body is tilted forward, then the underbody area exclusion is accurate, but the boundary angle with ground surface becomes acute when tilted backward causing ground surface crumbling
Solution Approach 1:
The patent implements dynamic boundary adjustment based on vehicle body tilt direction. When tilted backward, the system dynamically changes the boundary angle to be at least 90° relative to the ground surface, preventing acute angles that would cause ground surface crumbling while maintaining accuracy when tilted forward
Solution Approach 2:
The patent changes the boundary angle parameter dynamically based on vehicle body orientation. Instead of a fixed vertical boundary, the boundary angle is adjusted to maintain at least 90° with the ground surface when tilted backward, resolving the ground stability issue
Data Source
AI summary
In a hydraulic shovel operability range display device, a calculation unit is configured to set a boundary between an operability range and an underbody area along a vertical direction in a global coordinate system when a vehicle body is horizontally oriented. When the vehicle body is tilted forward, the calculation unit is configured to set the boundary so as to be maintained along the vertical direction in the global coordinate system. When the vehicle body is tilted backwards, the calculation unit is configured to correct the boundary between the operability range and the underbody area so that an angle formed by the boundary and the ground surface on which the vehicle body is positioned is at least 90°.