Placer Spreader Strike Off Plate with Adjustable Actuators
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Solution Overview
Problem
Existing placer spreader machines lack flexibility in their operation, as they rely on fixed strike off assemblies that are adjusted by raising and lowering the main frame, limiting their ability to form varying profiles and adapt to different paving conditions.
Innovation Solution
A strike off assembly with pivotable strike off plate portions and independently operable actuators, including left, right, and center actuators, allows for adjustable height and inclination of the material placement space, enabling the formation of crowns, troughs, and inclines, with a controller managing actuator positions based on user-defined profiles and remote operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the strike off assembly is fixed to the main frame and adjusted by raising and lowering the main frame, then the structure is simple, but the operational flexibility is limited
Solution Approach 1:
The strike off assembly is divided into separate components: a strike off plate assembly and a support beam assembly. The strike off plate assembly can be independently adjusted relative to the support beam through multiple actuators, allowing different profile adjustments without moving the entire main frame. This segmentation enables flexible operational adjustments while maintaining a relatively simple overall structure.
Solution Approach 2:
The strike off plate assembly is made dynamically adjustable through multiple independently operable actuators (first, second, and third actuators) that can raise and lower different portions of the strike off plate. This dynamic capability allows the system to adapt to various paving profiles (crowning, troughing, inclining) without requiring complex reconfiguration of the entire strike off assembly.
2Manufacturing precision
If multiple actuators are used to adjust different portions of the strike off plate, then the profile control precision is improved, but the device complexity increases
Solution Approach 1:
The strike off plate is divided into multiple adjustable portions, each controlled by a separate actuator. The first actuator controls a first portion, the second actuator controls a second portion, and the third actuator controls a third portion. This segmentation allows precise independent control of different profile sections (e.g., left side, center, right side) enabling complex profiles like crowns and troughs to be formed with high precision.
Solution Approach 2:
Multiple actuators are designed with similar structural configurations and control mechanisms, allowing them to perform different functions (controlling different portions of the strike off plate) while maintaining design consistency. This multi-functionality approach achieves high profile control precision without proportionally increasing overall system complexity.
3Adaptability or versatility
If the strike off plate portions are pivotable relative to each other, then the profile formation capability is improved, but the mechanical complexity increases
Solution Approach 1:
The strike off plate assembly incorporates pivotable connections between its portions, allowing dynamic reconfiguration of the plate geometry. The pivotable connections enable the strike off plate to form various profiles (crowning, troughing, inclining) by changing the relative angles between plate portions, providing enhanced profile formation capability with relatively simple rotational joints.
Data Source
AI summary
A strike off assembly for a placer spreader apparatus includes a strike off support beam and left and right side plate assemblies attached to ends of the support beam. A strike off plate assembly includes a left strike off plate portion and a right strike off plate portion pivotably connected together. A plurality of strike off actuators are connected to the strike off plate assembly and configured to raise and lower the strike off plate assembly relative to the support beam to vary a height of a material placement space.