Agricultural Baler Density Door Pressure Control
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Solution Overview
Problem
Agricultural balers face challenges in accurately and repeatably setting density door pressures across a wide range of pressures, affecting the density of formed bales.
Innovation Solution
The implementation of a fluid supply circuit with dual acting fluid cylinders and a pressure control module that allows for a wide range of pressure settings by switching between high and low pressure modes, controlled by a fluid supply controller, adjusts the density door pressures to achieve desired bale densities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single pressure control system is used for density doors, then the system structure is simple, but the ability to accurately set density door pressures across a wide range is insufficient
Solution Approach 1:
The pressure control system is segmented into multiple independent pressure control modules, each capable of controlling pressure within a specific range. This allows the system to accurately control density door pressures across a wide range by activating appropriate modules, resolving the contradiction between precision and complexity.
Solution Approach 2:
The system dynamically selects and activates specific pressure control modules based on the required pressure level. This dynamic adaptation allows the system to maintain simplicity by only activating necessary components while achieving wide-range pressure control accuracy.
2Manufacturing precision
If high pressure is always applied to density doors, then bale density can be maximized, but the system cannot accommodate different crop materials and conditions
Solution Approach 1:
The system dynamically adjusts pressure levels based on detected crop material characteristics and desired bale density. By switching between different pressure control modules, the system adapts to various crop conditions while maintaining precise control, resolving the contradiction between maximizing density and accommodating versatility.
Solution Approach 2:
The system changes pressure parameters according to crop material type and conditions. Multiple pressure control modules provide different pressure levels, allowing the system to optimize bale density for each specific crop scenario rather than applying constant high pressure.
3Reliability
If manual adjustment of density door pressures is used, then the system is simple to manufacture, but the repeatability of pressure settings is poor
Solution Approach 1:
The system incorporates feedback mechanisms that monitor actual pressure levels and automatically adjust them to match target values. This closed-loop control ensures repeatable pressure settings across multiple operations while maintaining system reliability, resolving the contradiction between reliability and complexity.
Solution Approach 2:
Manual mechanical pressure adjustment is replaced with automated electronic pressure control modules. This substitution eliminates human variability in pressure setting while providing consistent, repeatable results through programmable control.
Data Source
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AI summary
The present disclosure relates to an agricultural system. The agricultural system includes an agricultural baler (10), comprising: a plurality of movable density doors (210A, 210B, 210C); at least one fluid cylinder (220A, 220B) for moving at least one of the density doors (210A, 210B, 210C) and comprising a fluid chamber (322A, 322B) and a piston (323A, 323B) disposed in the fluid chamber (322A, 322B) to separate the fluid chamber (322A, 322B) into a piston side (324A, 324B) and a rod side (325A, 325B), and a cylinder rod (221A, 221B) coupled to the piston (323A, 323B) on the rod side (325A, 325B); a fluid supply circuit (300) for suppling working fluid to the at least one fluid cylinder (220A, 220B), the fluid supply circuit (300) being selectively connectable to the at least one fluid cylinder (220A, 220B) such that, in a first fluid supply mode, the fluid supply circuit (300) is connected to the at least one fluid cylinder (220A, 220B) to supply working fluid to only one side of the fluid chamber (322A, 322B) and that, in a second fluid supply mode, the fluid supply circuit (300) is connected to the at least one fluid cylinder (220A, 220B) to supply working fluid to both the piston side (324A, 324B) and the rod side (325A, 325B) of the fluid chamber (322A, 322B); and a control unit (320) configured to: receive density-data indicative of a desired bale density for bales produced by the agricultural baler; and determine a supply-mode-control-signal for setting the fluid supply circuit to its first or second fluid supply mode, on the basis of the density-data; and provide the supply-mode-control-signal to the fluid supply circuit.