Automated Wheel-Tracking Device for Asphalt Testing
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Solution Overview
Problem
Existing wheel-tracking devices for evaluating asphalt pavement samples require manual handling of heavy loading arms, posing safety risks and inefficiencies in inserting and removing testing trays, especially when samples are submerged in hot water.
Innovation Solution
A wheel-tracking device with an automated drive mechanism that moves the loading arm from a load position to a rest position, allowing for easier and safer insertion and removal of sample trays, featuring a tray receiving unit with sloping rails and locking mechanisms, and a weighted loading arm with a wheel that applies a consistent load of 705 N.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual handling of heavy loading arm is used, then device complexity is reduced, but operator safety and ease of operation deteriorate
Solution Approach 1:
The loading arm assembly is designed to automatically return to its initial position after the wheel completes reciprocating over the test sample, eliminating the need for manual repositioning by the operator. The system serves itself by using the rotational motion of the wheel to drive the loading arm back to its starting position through mechanical engagement with the drive mechanism.
Solution Approach 2:
The patent replaces manual mechanical handling with an automated drive mechanism that uses the wheel's rotation to automatically reposition the loading arm. This substitution eliminates the need for operator intervention while maintaining mechanical operation, improving safety and ease of use without requiring complex electronic or hydraulic systems.
2Productivity
If heavy loading arm is manually repositioned, then ease of operation deteriorates, but productivity is maintained
Solution Approach 1:
The drive mechanism ensures continuous operation by automatically returning the loading arm to its initial position without interrupting the testing cycle. The wheel's reciprocating motion continuously drives the loading arm back and forth, maintaining uninterrupted testing and eliminating idle time for operator repositioning.
Solution Approach 2:
The loading arm assembly automatically returns to its initial position through mechanical engagement with the drive mechanism, serving itself without external intervention. This self-repositioning capability maintains testing productivity while eliminating manual handling requirements.
3Ease of operation
If automated drive mechanism is added, then ease of operation improves, but device complexity increases
Solution Approach 1:
The drive mechanism serves multiple functions: it rotates the wheel over the test sample, drives the loading arm to its initial position, and maintains continuous operation throughout the testing cycle. By combining these functions into a single mechanism, the patent improves ease of operation without proportionally increasing device complexity.
Solution Approach 2:
The patent merges the wheel rotation function with the loading arm repositioning function into a single integrated drive mechanism. The mechanical connection between the wheel and loading arm allows one component to perform dual functions, reducing overall system complexity while improving operational ease.
Data Source
AI summary
A wheel-tracking test device includes a housing, one or more test chambers in the housing, one or more load arm assemblies, and a drive mechanism. Each test chamber is configured to receive and hold one or more asphalt test samples. Each load arm assembly includes a weighted loading arm and a wheel rotatably connected to the loading arm. The drive mechanism is configured to move the load arm assembly from a load position in which the wheel is on a test sample held in the test chamber and a rest position by retracting the loading arm such that the wheel is lifted off the test sample.