Mobile Road Repair Unit With Adjustable Blade-Cylinder Gap Control
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Solution Overview
Problem
Existing technologies face challenges in precisely dosing small-sized aggregates (gravel or sand with a grain size of 1 to 3 mm) during road surface repair, leading to either wastage or inadequate repair due to excess or insufficient spreading.
Innovation Solution
A mobile unit with a chassis-mounted aggregate and binder distribution system, featuring adjustable trapdoors and nozzles, and a mechanism to control the gap between the aggregate flow regulating blade and rotating cylinder, allowing precise control over the spreading of aggregates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional gravel spreading machines are used, then road surface repair can be performed, but precise dosage control of small-sized aggregates (1-3 mm) cannot be achieved
Solution Approach 1:
The invention changes the critical parameter from aggregate size handling to gap distance control. By precisely controlling the gap between the regulating blade and rotating cylinder (a continuous adjustable parameter), the system achieves accurate dosage control for small-sized aggregates (1-3 mm) that conventional machines cannot handle properly.
Solution Approach 2:
The invention replaces conventional mechanical dosage control mechanisms with a blade-cylinder gap control system. The dosage is controlled by the geometric relationship and gap distance between the aggregate flow regulating blade and the rotating cylinder, rather than traditional mechanical dosing mechanisms, enabling finer control precision.
2Reliability
If more aggregate is spread to ensure adequate coverage, then road surface repair quality improves, but material wastage increases
Solution Approach 1:
The system incorporates feedback through the blade-cylinder gap mechanism. The regulating blade controls the aggregate flow onto the rotating cylinder, and by adjusting the gap distance, the system provides continuous feedback control on the aggregate dosage, ensuring neither excess nor deficiency in material application.
Solution Approach 2:
The invention introduces dynamic adjustability in the blade-cylinder gap distance during operation. This dynamic control allows the system to adapt the aggregate dosage in real-time, ensuring optimal material usage while maintaining reliable road surface repair quality without fixed, overly conservative dosing.
3Manufacturing precision
If conventional spreading mechanisms are used, then equipment simplicity is maintained, but control precision over aggregate flow cannot be achieved
Solution Approach 1:
The invention extracts the dosage control function from complex mechanical dosing mechanisms and isolates it into a simple blade-cylinder gap system. By taking out the essential control element (the gap distance between blade and cylinder), the system achieves high manufacturing precision without requiring complex dosage control mechanisms.
Solution Approach 2:
The invention applies local quality control at the critical point of aggregate discharge. Instead of controlling the entire aggregate handling system, the blade-cylinder gap mechanism focuses control precision locally at the discharge point where aggregates transfer from the blade to the rotating cylinder, achieving high spreading precision with minimal complexity.
Data Source
Figure 1
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AI summary
The invention relates to a mobile unit (1) for making and/or repairing road surfacing, characterized in that the mechanism (11) for actuation of the aggregate flow regulator blade (9) comprises a driven lever (12), on which the blade (9) is fixed and a mechanism (16) reducing the displacement of the driven lever (12) from the displacement of a drive device (15) of a rotation axis (140), such that the rotation of the second rotation axis (140) causes the driven lever (12) to rotate relative to the first rotation axis (120) in order to vary the aggregate passage gap between the blade (9) and the rotating aggregate discharge cylinder (10).