Paving Screed Tamper Stroke Adjustment Mechanism
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Solution Overview
Problem
Current road paving technologies face challenges in maintaining uniform pre-compression and surface flatness due to variations in installation speed and surface thickness, requiring manual adjustments that are time-consuming and labor-intensive, leading to unevenness and reduced quality of the built-in covering.
Innovation Solution
An automated system that adjusts the stroke and frequency of the tamper based on real-time installation parameters, such as speed and thickness, using sensors and a control system to maintain optimal pre-compression and angle of attack, ensuring consistent quality without operator intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If manual adjustment of tamper stroke is performed in several stages, then the installation operation can be completed with available equipment, but the adjustment process is time-consuming and requires installation interruptions
Solution Approach 1:
The patent replaces manual mechanical adjustment with an automated control system that uses sensors to detect installation parameters and automatically adjusts the tamper stroke via actuating mechanisms, eliminating the need for manual intervention and installation interruptions
Solution Approach 2:
The system performs self-adjustment by automatically detecting installation conditions through sensors and modifying tamper stroke parameters without external human input, enabling continuous operation and eliminating adjustment-related downtime
2Strength
If the stroke is increased to achieve higher pre-compression, then the pre-compression effect is improved, but the angle of attack may become negative causing open cracked surface structure
Solution Approach 1:
The system uses sensors to continuously monitor installation parameters including angle of attack and automatically adjusts the tamper stroke to maintain optimal values, preventing both insufficient pre-compression and excessive stroke that would cause negative angle of attack and surface cracking
Solution Approach 2:
The tamper stroke is made dynamically adjustable rather than fixed, allowing real-time modification based on detected installation conditions to maintain optimal pre-compression while preventing surface damage from excessive stroke
3Strength
If the frequency is increased to increase pre-compression, then the pre-compression effect is improved, but the energy consumption and machine load increase
Solution Approach 1:
The control system monitors installation parameters and automatically adjusts tamper frequency to maintain optimal pre-compression levels, avoiding excessive frequency increases that would unnecessarily consume energy while ensuring sufficient compaction quality
4Productivity
If the installation speed is increased to improve productivity, then the installation efficiency is improved, but the pre-compression quality deteriorates
Solution Approach 1:
The tamper stroke and frequency are dynamically adjusted based on detected installation speed, allowing the system to maintain optimal pre-compression quality even when operating at higher installation speeds by compensating with adjusted compaction parameters
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 system achieves uniform high-quality paving by automatically optimizing the tamper stroke and frequency in response to changing conditions, reducing manual labor and ensuring constant pre-compression and flatness across the entire installation width.
Implementation Method 1
The stroke of the tamper strip is adjustable by a relative rotation adjustment between an eccentric bush (23) and an eccentric shaft (15)
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a screed (3) for road pavers (1), with a compaction unit (13), in particular a tamper (14) with a tamper bar, which can be driven in cyclic working cycles with selectable stroke (H) and selectable frequency (F), for pre-compacting a pavement (6) made of paving material (5), wherein the compaction unit (13) has an adjustment gear (24) for remotely adjusting the stroke (H) of the compaction unit, wherein the adjustment gear (24) is arranged between a bearing block (16') supporting a rotary-driven eccentric shaft (15) and an adjustment lever (50) which is pivotally connected to a connecting rod (21) driving the tamper bar (14) and is adjustable in the bearing block (16'), wherein the adjustment lever (50) and the push rod (48) driven by the eccentric shaft (15) are arranged in at least one preferably common, joint axis (49) are coupled to the connecting rod (21).