Regenerative Bale Handler Cylinder for Lower Peak Hydraulic Power
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Solution Overview
Problem
Cotton harvesters face peak power demands when multiple systems require power simultaneously, leading to excessive engine power usage and heat rejection, particularly during bale handling operations, which is costly and inefficient.
Innovation Solution
Implementing a bale handler system with a regenerative valve for raising and a float/gravity lower mode operation to reduce power requirements, where the regenerative valve regulates oil flow pressure during raising and gravity assists in lowering, thereby minimizing auxiliary pump usage and optimizing power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a larger engine is provided to meet peak power demands during bale handling operations, then power availability is improved, but cost increases
Solution Approach 1:
The system dynamically switches between powered mode and float mode based on operational requirements. The handler cylinder operates in float mode during lowering operations, eliminating the need for continuous high-power pump operation. This dynamic operation allows a smaller engine to meet peak power demands only when necessary, reducing overall power requirements and associated costs.
Solution Approach 2:
The auxiliary pump operates intermittently rather than continuously - it provides high pressure during raising operations and other critical functions, then stops during float mode lowering operations. This periodic operation reduces average power consumption, allowing a smaller, less expensive engine to suffice while still meeting peak power demands when needed.
2Power
If the auxiliary pump operates at high standby pressure to extend the handler cylinder, then raising capability is improved, but power consumption increases
Solution Approach 1:
During lowering operations, the system uses float mode where the handler cylinder retracts under its own weight without requiring auxiliary pump power. The high-pressure pump is not needed during this phase, as gravity provides the necessary force. This self-service approach eliminates unnecessary power consumption during portions of the operational cycle.
Solution Approach 2:
The system dynamically adjusts pump operation based on the handler's position and operational mode. The auxiliary pump operates at high pressure only when raising the handler or when other critical functions require it, and stops or reduces pressure during float mode lowering operations, optimizing power consumption while maintaining raising capability.
3Reliability
If the pressure compensated pump operates at high standby pressure during handler extension, then handler raising is ensured, but heat rejection to cooling system increases
Solution Approach 1:
The pressure compensated pump operates at high standby pressure periodically rather than continuously - specifically during handler raising operations and other critical functions. During float mode lowering operations, the pump is not required to maintain high pressure, eliminating unnecessary heat generation and reducing thermal load on the cooling system while ensuring handler raising capability when needed.
Solution Approach 2:
The handler lowering operation uses gravity and float mode, which are self-service mechanisms that do not require high-pressure pump operation. This eliminates the heat rejection associated with continuous high-pressure operation, while the system maintains the capability to raise the handler reliably when needed through periodic high-pressure pump operation.
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
This approach reduces peak power needs, allows for power savings, and enables the bale handler system to operate efficiently, diverting power to other critical systems during high demand periods, potentially allowing for a smaller, less expensive engine and reduced hydraulic heat rejection.
Implementation Method 1
a regenerative valve for raising and a float/gravity lower mode operation to reduce power requirements, where the regenerative valve regulates oil flow pressure during raising
Implementation Method 2
float/gravity lower mode operation... gravity assists in lowering
Data Source
AI summary
Hydraulic power savings for a rear module handler cylinder of a round module cotton harvester is possible by using a regenerative hydraulic arrangement for raising an empty handler and using gravity to lower the handler. A bale handler system for a cotton picker baler includes a handler for receiving a round module that is movable between upright and lowered positions and a handler cylinder operably connected to the handler. The handler cylinder system includes a regenerative valve. The regenerative valve is engaged when the handler moves to the upright position during regenerative handler raise mode of operation, the regenerative valve is not engaged when the handler moves to the lowered position during float handler lower mode of operation. While in the float handler lower mode of operation, the handler cylinder retracts and diverts an oil flow pressure from a base end to a rod end of the handler cylinder.