Asphalt Finisher Screed Width Control Mechanism
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Solution Overview
Problem
In asphalt finishers, the side plate of the screed can potentially come into contact with the screw when the screed's length in the vehicle width direction is adjusted, either manually or automatically, leading to safety concerns.
Innovation Solution
The screed device is designed to be capable of expanding and contracting in the vehicle width direction, with control mechanisms ensuring that its length does not fall below a predetermined length, preventing contact with the screw.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the screed device is made expandable and contractible in the vehicle width direction to adapt to different road widths, then the adaptability is improved, but the risk of side plate contacting the screw increases
Solution Approach 1:
The screed device is designed with expandable and contractible sections that allow dynamic adjustment of its width to match different road widths. This dynamic capability enables the screed to adapt to various working conditions while maintaining safety through controlled movement ranges that prevent side plate contact with the screw.
Solution Approach 2:
The system changes the physical parameter of screed width by extending or retracting sections of the screed device. By controlling the extension/retraction parameters within safe limits, the system achieves adaptability to different road widths while preventing harmful contact between the side plate and screw.
2Ease of operation
If automatic steering control is implemented to correct screed length automatically, then the ease of operation is improved, but the complexity of the control system increases
Solution Approach 1:
The automatic steering control system uses feedback from sensors that detect the position and length of the screed relative to the road edges. This feedback enables the control system to automatically adjust the screed width and steering angle, simplifying operation while the intelligent control algorithm manages the system complexity.
Solution Approach 2:
The system performs self-correction of screed length and positioning through automatic steering control. The control system automatically detects deviations and adjusts the screed width and vehicle direction without operator intervention, enabling the system to service itself and maintain optimal positioning.
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
Improvement of safety is realized. An asphalt finisher (100) includes a tractor (1), a hopper (2) that is provided on a front side of the tractor (1), a conveyor (CV) that transports a paving material in the hopper (2) to a rear side of the tractor (1), a screw (3) that spreads the paving material, which is transported by the conveyor (CV) and which is sprinkled to a road surface, in a vehicle width direction, and a screed device (31) that levels the paving material spread by the screw (3) on a rear side of the screw (3) and that is capable of expanding and contracting in the vehicle width direction, in which expansion and contraction of the screed device (31) is configured to be controlled such that a length of the screed device (31) in the vehicle width direction does not fall below a predetermined length based on the screw (3).