Tamper Bar Heating Element Design for Road Pavers
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Solution Overview
Problem
Existing road compacting devices face issues with maintenance-intensive heating elements in tamper bars, leading to undesired downtimes and inefficiencies due to frequent breakages and heat loss through convection.
Innovation Solution
A tamper strip with a robust round tube heating element, connected via a connection block and secured using elastic deformation or a corrugated shim, which reduces maintenance and heat loss by improving heat distribution and securing the heating element against vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flat tube heating element is used in the tamper bar, then heating capacity is provided, but the heating element often breaks and requires frequent maintenance
Solution Approach 1:
The patent applies this principle by replacing the flat tube heating element with a round tube heating element. The round cross-section provides superior mechanical strength and resistance to breakage compared to the flat tube design, directly resolving the reliability and maintenance issues while maintaining the heating function within the tamper bar.
2Reliability
If the heating element is securely clamped in the tamper bar, then heating capacity is improved, but heat losses through convection increase due to larger recess
Solution Approach 1:
The round tube heating element allows for a more compact recess design compared to flat tube elements. The circular cross-section enables better space utilization within the tamper bar, reducing the recess volume and thereby minimizing heat losses through convection while still providing secure clamping of the heating element.
3Loss of energy
If a round tube heating element is used, then heat distribution is improved and convection losses are reduced, but the heating element requires secure fastening against vibrations
Solution Approach 1:
The patent applies segmentation by dividing the fastening function into separate components: a retaining plate for mechanical retention and elastic deformation elements for securing. This modular approach allows the round tube heating element to be firmly fixed against vibrations while maintaining the benefits of improved heat distribution and reduced convection losses.
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 provides a low-maintenance heating system with enhanced heat capacity and reduced convection losses, ensuring efficient operation and prolonged equipment life by stabilizing the heating element within the tamper bar.
Implementation Method 1
The heating element is a round tube heating element
Implementation Method 2
The heating element can be fastened by clamping with a retaining plate or by elastic deformation. In the case of clamping by elastic deformation, a statically acting energy store can be used using the elastic deformation.
Data Source
Figure 1a~1b
Figure 2
Figure 3
AI summary
The invention relates to a device for compacting road paving materials, comprising a screed board which is fastened on a road finisher and extends at a right angle to the direction of travel of the road finisher and a tamper that is mounted in front and/or behind the screed board. Said tamper has a tamper strip (9) that can be driven to perform a striking upward and downward movement and the interior of which is equipped with an electrical heating unit in the form of a rod-shaped heating element (12) that can be clamped into a recess of the tamper strip. The device according to the invention is characterized in that the heating element is a tubular heating unit the coil (20) of which is folded at least once on a free end of the tubular heating unit, thereby forming two adjacent rods (33, 34) that are connected to a power supply unit in a common terminal block (14).