Harvesting Header Hydraulic Loop for High-Flow Tool Operation
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Solution Overview
Problem
Current hydraulic drive systems for agricultural machines, such as combine harvesters, lack simplicity and robustness in driving and controlling tools, particularly headers, which often require higher hydraulic fluid flow rates than the machines can provide, limiting the operation of more demanding tools.
Innovation Solution
A harvesting header system with a hydraulic pump and fluid loop that receives hydraulic fluid from the machine, circulates it to tools, and returns it, featuring a clutch to engage the pump only when pressure exceeds a threshold, enabling increased flow rates and preventing cavitation, thus allowing operation of tools that require higher fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydraulic fluid is circulated from the crop-harvesting machine to the header tools and back, then the tools can operate with higher hydraulic fluid flow and pressure, but the system complexity increases due to the additional hydraulic pump and fluid loop components
Solution Approach 1:
The hydraulic system is segmented into two independent loops: a main hydraulic system in the crop-harvesting machine and a secondary hydraulic fluid loop in the header. This segmentation allows the header to have its own hydraulic pump and fluid circulation path, enabling high-flow tools to operate independently without affecting the main system, thus resolving the contradiction between improved productivity and increased complexity by isolating the complex high-flow subsystem.
Solution Approach 2:
A secondary hydraulic pump acts as an intermediary component between the main hydraulic system and the header tools. This intermediary pump receives hydraulic fluid from the main system via the fluid inlet, pressurizes it further, and delivers it to the tools through the hydraulic fluid loop, then returns it to the main system via the fluid outlet. This intermediary enables the tools to receive higher flow and pressure while maintaining system modularity.
2Productivity
If a hydraulic pump is added to the header frame to circulate hydraulic fluid, then tools can receive higher hydraulic fluid flow, but the weight of the header increases
Solution Approach 1:
The hydraulic pump mounted on the header frame serves multiple functions: it pressurizes hydraulic fluid for high-flow tools, maintains fluid circulation in the secondary loop, and can potentially serve multiple tools simultaneously. This multi-functionality justifies the added weight by providing comprehensive hydraulic power to various header tools, resolving the contradiction between productivity improvement and weight increase.
3Productivity
If hydraulic fluid is circulated within the header from the pump to the tools and back, then tools can operate with increased hydraulic fluid flow, but the device complexity increases due to the hydraulic fluid loop components
Solution Approach 1:
The hydraulic fluid loop components (pump, hoses, fittings, and tool hydraulic systems) are merged into an integrated secondary hydraulic system mounted on the header frame. This consolidation allows the header to function as a self-contained hydraulic unit with its own fluid circulation path, enabling high-flow tool operation while managing complexity through systematic integration rather than scattered components.
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
Enables the operation of tools that require higher hydraulic fluid flow rates than conventional systems can provide, extends the life of the hydraulic pump by preventing cavitation, and reduces operating costs by optimizing fluid flow and energy usage.
Implementation Method 1
a hydraulic pump carried by the header frame... circulating the hydraulic fluid within the header in the hydraulic fluid loop from the hydraulic pump to at least one tool carried by the header frame and back to the hydraulic pump
Data Source
AI summary
A harvesting header includes a header frame structured to be coupled to the crop-harvesting machine, a hydraulic pump carried by the header frame, at least one tool carried by the header frame, a hydraulic fluid loop carried by the header frame, a fluid inlet structured to receive hydraulic fluid from the crop-harvesting machine, and a fluid outlet structured to deliver hydraulic fluid to the crop-harvesting machine. The hydraulic fluid loop is structured to circulate hydraulic fluid within the header from the hydraulic pump to the tool(s) and back to the hydraulic pump. Related methods of operating a harvesting header and a non-transitory computer-readable media are also disclosed.