Breakaway Couplers for Paving Machine Sensor Units
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Solution Overview
Problem
Sensor units on paving machines are prone to damage due to interference with terrain obstacles, leading to machine breakdowns, operational downtime, and increased costs.
Innovation Solution
A breakaway coupler system is integrated into the paving machine, featuring adjustable retention force to disengage sensor units from the elongated structure upon collision with obstacles, preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensor units are firmly retained to the elongated structure, then measurement reliability is improved, but vulnerability to damage from terrain obstacles increases
Solution Approach 1:
The retainer unit employs a biasing member (spring) to provide a dynamic, adjustable retention force rather than a fixed rigid connection. This allows the sensor unit to be firmly held during normal operation but automatically release when collision force exceeds the retention force, resolving the contradiction between secure retention and damage protection
Solution Approach 2:
The retention force is made adjustable by changing the biasing force of the spring mechanism. This parameter adjustment allows optimization between two opposing requirements: strong enough to maintain reliable sensor retention during paving operations, but weak enough to allow breakaway when obstacle collision occurs
2Stability of the object's composition
If sensor units are securely mounted, then operational stability is improved, but machine downtime due to sensor damage increases
Solution Approach 1:
The sensor unit mounting system is designed as a sacrificial connection where the retainer unit can be quickly replaced after breakaway. This allows the expensive sensor unit itself to be protected from damage while the inexpensive retainer mechanism absorbs the collision impact, minimizing operational downtime
Solution Approach 2:
The dynamic spring-based retention system automatically transitions from a stable retained state to a released state upon collision, preventing sensor damage and enabling quick replacement of the retainer unit rather than the entire sensor assembly, thus reducing operational downtime
3Force
If retention force is increased, then sensor unit retention is improved, but damage inhibition during collision decreases
Solution Approach 1:
The retention force is not fixed but dynamically adjustable through the spring mechanism. The spring can be pre-loaded to provide appropriate retention force for normal operations while automatically yielding when collision forces exceed this threshold, thus preventing sensor damage without compromising normal retention
Solution Approach 2:
The physical state of the spring (compression, tension, material properties) can be changed to adjust the retention force parameter. This allows optimization of the force balance between secure retention during operation and controlled release during obstacle collision to inhibit damage
Data Source
AI summary
A paving machine includes an implement, an elongated structure, a sensor arrangement, and one or more breakaway couplers. The implement modifies a surface during a movement of the paving machine. The elongated structure is coupled to a side portion of the paving machine and extends along a direction of the movement. The sensor arrangement includes sensor units arranged sequentially along the elongated structure. The breakaway couplers correspondingly normally retain the sensor units to the elongated structure. Each breakaway coupler includes a mounting structure and a retainer unit. The mounting structure is secured to one of the elongated structure or a corresponding sensor unit, while the retainer unit retains the other of the elongated structure or the corresponding sensor unit to the mounting structure by a retention force, which is adjustable.