Paver Screed Endgate Height Control via Spring Actuation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional asphalt paving systems face challenges in reliably and efficiently adjusting the height of endgates to maintain consistent asphalt mat thickness and prevent material migration, as existing manual adjustment methods are labor-intensive and limited by the range of endgate springs.
Innovation Solution
A height adjustment system for paving screeds that includes endgates coupled to springs and actuators, with sensors and a controller to automatically extend or compress the springs within a setpoint range, ensuring consistent contact with the reference surface and accommodating varying surface grades.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual adjustment methods are used for endgate height, then operator control is maintained, but labor intensity increases and adjustment reliability decreases
Solution Approach 1:
The endgate height adjustment system automatically monitors spring position via sensors and actuates adjustment mechanisms when spring compression exceeds predetermined thresholds, enabling the system to self-regulate endgate height without continuous operator intervention. This maintains reliable height control while reducing manual labor.
Solution Approach 2:
Sensors continuously monitor the compression state of endgate springs and provide feedback to the control system. When spring compression exceeds predetermined thresholds, the system automatically activates actuators to adjust endgate height, creating a closed-loop control system that maintains consistent mat thickness without manual intervention.
2Adaptability or versatility
If endgate springs are used for height adjustment, then automatic height maintenance is enabled, but the range of adjustment is limited
Solution Approach 1:
The system dynamically adjusts endgate height by combining spring-based automatic maintenance with actuator-driven adjustments. When spring compression exceeds predetermined thresholds, actuators extend or retract to restore springs to their setpoint compression, enabling the system to adapt to varying surface grades and mat thickness requirements while maintaining reliable spring operation within optimal ranges.
3Reliability
If continuous manual adjustment of endgate jacks is performed, then spring setpoint is maintained, but operator workload increases
Solution Approach 1:
The control system automatically monitors spring compression through sensors and activates actuators when predetermined thresholds are exceeded, enabling the system to self-maintain spring setpoints without continuous operator intervention. This preserves reliable height control while eliminating the need for constant manual adjustment, thereby improving paving operation efficiency.
4Manufacturing precision
If endgate springs reach full extension or compression, then mat thickness varies, but material migration or loss of float capability occurs
Solution Approach 1:
Sensors continuously monitor endgate spring compression and provide feedback to the control system. When spring compression approaches thresholds that would cause full extension or compression, the system automatically activates actuators to adjust endgate height and restore springs to their setpoint compression. This maintains consistent mat thickness while preventing material migration and preserving the endgate's ability to float on thinner mats.
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 enables continuous, automated adjustment of endgate heights, reducing operator intervention and preventing asphalt material loss or failure to float on thinner mats, thereby maintaining uniform mat thickness and surface finish.
Implementation Method 1
an endgate coupled to a first spring... The first spring and endgate are moveable between a compressed position and an extended position
Implementation Method 2
At least one of the first spring and the endgate are linked to a first sensor. The first sensor is linked to the controller. The first sensor detects an actual position of the first spring and the endgate
Data Source
AI summary
A height adjustment system for a paving screed apparatus and a method for adjusting the height of the endgates of a screed system are disclosed. In a disclosed system, the system includes an endgate coupled to a biasing element, such as a spring or a hydraulic cylinder and rod. The biasing element is coupled to an actuator. The actuator is linked to a controller. The biasing element is moveable between a compressed position and an extended position with a setpoint range disposed between the compressed and extended positions. The biasing element is also associated with a sensor for measuring vertical displacement of the biasing element, pressure or load on the biasing element with respect to the setpoint range.