Screed Heating Element Retention via Adjustable Spring Assemblies
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Solution Overview
Problem
Existing screed heating element systems, such as those in U.S. Pat. No. 10,017,905, do not facilitate easy replacement and installation of screed heating elements and lack even heat distribution, with components being inaccessible and difficult to reach, leading to inefficiencies in paving material compaction and adhesion issues.
Innovation Solution
A screed assembly with a screed frame having openings for accessible compression spring assemblies, which connect to a heating element cover, allowing for adjustable positioning and easy removal of heating elements, ensuring even heat distribution and simplified maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a compression bolt assembly is used to secure the heating element, then the heating element is retained on the screed plate, but the components become inaccessible and difficult to reach for maintenance and replacement
Solution Approach 1:
The compression assembly is divided into modular components: a first portion attached to the screed frame and a second portion attached to the heating element cover. This segmentation allows the heating element cover to be removed independently for maintenance while the compression mechanism remains in place, resolving the contradiction between secure retention and ease of repair.
2Force
If the compression bolt assembly is inserted through the upper portion of the screed plate, then the heating element is compressed against the screed plate, but the assembly becomes difficult to access and adjust
Solution Approach 1:
The compression assembly is repositioned from a vertical configuration (through the screed plate) to a horizontal configuration along the screed frame. This dimensional change allows the compression mechanism to be accessed and adjusted from the side of the screed assembly, improving ease of operation while maintaining the necessary compression force through the heating element.
3Manufacturing precision
If the heating element cover is securely fastened, then even heat distribution is achieved, but the heating element becomes difficult to remove for replacement
Solution Approach 1:
The compression assembly is designed with adjustable characteristics, allowing the compression force to be dynamically modified. The adjustable compression maintains consistent contact between the heating element and screed plate for even heat distribution during operation, while allowing the heating element cover to be easily removed for replacement when needed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables efficient replacement and installation of heating elements, promoting uniform heat distribution and reducing the complexity of maintenance, thereby improving paving material compaction and reducing adhesion issues, enhancing the overall performance of paving machines.
Implementation Method 1
a plurality of compression spring assemblies connected to the screed frame and connected to the heating element cover, wherein each of the plurality of compression spring assemblies includes at least a bolt, a spring and a spring adjustment nut that together are configured to exert a desired force on the heating element cover
Implementation Method 2
the screed plate is typically heated, to a temperature in the range of about 82° to 171° C. (180° to 340° F.). Heating the screed plate assists the paving material in flowing under the screed plate and reduces adhesion of the paving material to the screed plate
Data Source
AI summary
A screed assembly for use with a paving machine is disclosed. The screed assembly can optionally comprise: a screed plate; a heating assembly having a heating element positioned on the screed plate; a heating element cover positioned on or adjacent the heating element; a screed frame releasably coupled to the screed plate and having one or more openings therein; and a plurality of compression spring assemblies connected to the screed frame and connected to the heating element cover. Each of the plurality of compression spring assemblies can be are configured to exert a desired force on the heating element cover. The plurality of compression spring assemblies are accessible through the one or more openings of the screed frame and the bolt is moveable relative to the screed frame to adjust a position of the heating element cover relative to the heating element for facilitating removal of the heating element.