Dual-Acting Density Door Hydraulics for Variable Bale Density
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Solution Overview
Problem
Agricultural balers face challenges in forming bales with varying densities due to the need for adjustable pressure exerted by density doors, which depends on the crop material and desired density.
Innovation Solution
The implementation of a dual acting fluid cylinder system controlled by a fluid supply circuit with multiple modes, allowing for adjustable pressure exertion by density doors through a fluid supply controller that can switch between different fluid supply modes to manage pressure on crop material in the bale chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single-acting fluid cylinder is used to move density doors, then the structure is simple, but only one pressure level can be exerted on crop material
Solution Approach 1:
The patent applies dynamics by making the fluid cylinder system adjustable and versatile. A dual-acting fluid cylinder is used instead of a single-acting one, allowing the density doors to be moved with adjustable force in both directions. The fluid supply system can vary pressure levels dynamically, enabling the same mechanism to exert both high and low pressures on crop material depending on operational requirements, thus resolving the contradiction between adaptability and complexity.
Solution Approach 2:
The patent changes physical parameters of the fluid system to achieve multiple pressure levels. By controlling fluid pressure parameters in the dual-acting cylinder, the system can switch between high-pressure mode (for dense bales) and low-pressure mode (for lighter bales). This parameter variation allows one mechanical system to perform multiple functions, achieving adaptability without proportionally increasing complexity.
2Ease of operation
If sophisticated electronic controls are used to manage density door pressure, then precise pressure control is achieved, but device complexity and cost increase
Solution Approach 1:
The patent replaces sophisticated electronic controls with a mechanically-controlled fluid system. The dual-acting fluid cylinder is controlled through fluid pressure regulation rather than complex electronic actuators. This mechanical-hydraulic approach achieves precise pressure control through fluid dynamics and mechanical linkages, maintaining ease of operation while reducing electronic complexity and cost.
Solution Approach 2:
The fluid supply system incorporates self-regulating features where fluid pressure naturally balances the density door positions. The system uses fluid pressure feedback and mechanical equilibrium to maintain control, reducing the need for active electronic sensing and control algorithms. This self-service characteristic simplifies the control system while maintaining operational precision.
3Productivity
If density doors are designed for quick opening and closing, then bale formation speed increases, but structural strength may be compromised
Solution Approach 1:
The patent uses hydraulic actuators to move the density doors, providing high force in a compact package. The fluid pressure system can rapidly extend and retract the cylinders, enabling quick opening and closing of density doors without requiring large mechanical linkages that would compromise structural strength. The hydraulic system delivers the necessary force bursts for rapid movement while maintaining door structural integrity through properly designed mounting and linkage 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 agricultural baler to exert both high and low pressures on crop material, facilitating the formation of bales with a range of densities without requiring sophisticated electronics and allowing for quick opening and closing of density doors.
Implementation Method 1
at least one density door is moved by a dual acting fluid cylinder supplied with fluid by a fluid supply circuit
Data Source
AI summary
A bale chamber includes: movable density doors; at least one fluid cylinder including a fluid chamber, a piston separating the fluid chamber into a piston side and a rod side, a cylinder rod coupled to the piston on the rod side and configured to move at least one of the density doors, a piston fluid port, and a rod fluid port; and a fluid supply circuit fluidly coupled to the fluid chamber and configured to supply working fluid to the fluid chamber, the fluid supply circuit including a fluid supply controller that is selectively switchable to a first fluid supply mode and a second fluid supply mode, the fluid supply circuit being configured to supply working fluid to only the piston side when in the first fluid supply mode and to supply working fluid to both the piston side and the rod side when in the second fluid supply mode.