Screed Shoulder Angle Adjustment for Width Extension
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Solution Overview
Problem
Existing screeds with extending screeds mounted on the front of the base screed face challenges in changing the working width without impeding adjustment movements due to high weight and paving forces, and they are limited in their ability to double the base screed width.
Innovation Solution
The solution involves adjusting only the shoulder angle of the extending screed on the base guide structure, allowing for stable installation and reducing stress on height adjustment devices, with a shoulder hinge and actuator providing a favorable force arm for stable support, and a telescoping guide system enabling a working width change up to twice the base screed width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the actuator absorbs the weight of the entire extending screed and paving forces, then the extending screed can be fully extended, but the height adjustments required during installation are impeded due to high local loads
Solution Approach 1:
The guide structure is divided into a base guide structure mounted on the base screed and a separate pull-out guide structure that can be independently displaced. This segmentation allows the actuator to only pivot the base guide structure while the pull-out guide structure handles the extending screed weight through its own support mechanism, reducing the actuator's load and enabling height adjustments during installation.
2Adaptability or versatility
If the actuator is used for both height adjustment and pivoting the base guide structure, then dual function is achieved, but high local loads occur between the base guide structure, base plank and actuator
Solution Approach 1:
The guide structure is segmented into base and pull-out portions, each with separate support functions. The actuator only pivots the base guide structure, while the pull-out guide structure independently supports the extending screed weight through its connection to the screed frame, distributing loads and reducing stress on the actuator and base components.
Solution Approach 2:
The pull-out guide structure acts as an intermediary between the base guide structure and the extending screed. It receives the extending screed weight and transfers it to its own support points, mediating the load path so that the actuator does not bear the full weight plus paving forces, thereby reducing local loads while maintaining dual functionality.
3Device complexity
If only the limited stroke of the pull-out guide structure in the base guide structure is used to change the working width, then the structure remains simple, but the working width cannot be changed to twice the width of the basic screed
Solution Approach 1:
The guide structure is segmented into a base guide structure with a first displacement stroke and a pull-out guide structure with a second displacement stroke. This segmentation allows the total working width change to be the sum of both strokes, enabling the working width to be changed to twice the base screed width while keeping each individual guide structure relatively simple.
Solution Approach 2:
The solution extends the displacement capability by adding a second dimension of movement through the pull-out guide structure that operates in addition to the base guide structure's stroke. This dimensional extension allows the total displacement to reach twice the base screed width without significantly increasing the complexity of each individual guide component.
Data Source
Figure 1~10
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AI summary
The screed (E) has an extraction guiding structure (16) guided in a guiding sub-structure (17). A smoothing plate frame structure (14) is mounted at the extraction guiding structure, and includes an extraction screed-smoothing plate (11). Vertical guidances (20) and elevation adjustment assemblies (21) are provided between the frame structure and the extraction guiding structure, and vertically extend in relation to a linear sliding direction. The guidances and the assemblies adjust elevation of the frame structure in a parallel manner and relative to a base guiding structure (18).