Variable Diameter Round Baler Pressure Control
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Solution Overview
Problem
Existing round balers with variable compression chambers face challenges in reliably controlling baling pressure, leading to inconsistent bale density and potential deformation due to the imbalance between swivel arms.
Innovation Solution
A round baler with a variable diameter baling chamber and adjustable clamping arms, where the pressing pressure is controlled based on the size of the compression chamber and effective length of the pressing means, using a cam control mechanism or electric/hydraulic actuators to set and regulate the maximum pressing pressure, ensuring precise adjustment and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydraulic cylinders are used to couple swivel arms for balance, then the size change of baling chamber and pressing pressure are balanced, but reliable control of pressing pressure is not possible and bale deformation occurs
Solution Approach 1:
The patent implements feedback control by detecting the actual pressing pressure through the position of the second clamping arm and comparing it with the target pressure determined by the cam profile. The system automatically adjusts to maintain the correct pressing pressure throughout the baling cycle, ensuring reliable control and preventing bale deformation.
Solution Approach 2:
The cam profile is pre-configured with the optimal control function that determines the target pressing pressure for each position of the first clamping arm. This preliminary setup eliminates the need for real-time complex calculations and ensures that the correct pressing pressure is maintained from the start of the baling process.
2Manufacturing precision
If pressing pressure is increased to improve bale density, then bale formation is improved, but bale deformation may occur due to imbalance
Solution Approach 1:
The patent dynamically adjusts the pressing pressure parameter throughout the baling cycle based on the chamber size and bale formation stage. The cam profile encodes the optimal pressure progression, allowing the system to apply higher pressure when needed for density while automatically reducing pressure to prevent deformation, thus optimizing both bale density and shape stability.
3Reliability
If cam control mechanism is used to set second clamping arm position, then pressing pressure control is simplified and made reliable, but device complexity increases
Solution Approach 1:
The patent replaces complex electronic control systems with a mechanically sophisticated cam profile that embodies the optimal control function. The cam profile translates the position of the first clamping arm into the appropriate position of the second clamping arm through pure mechanical interaction, eliminating the need for sensors, controllers, and power consumption while maintaining high reliability.
Data Source
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AI summary
A round baler (10) comprises a pressing chamber (12) arranged in a housing (14) for pressing round bales (16) from a crop, wherein the pressing chamber (12) has a variable diameter, an endlessly rotating pressing element (18) which delimits the pressing chamber (12), several rollers (20) for guiding the pressing element (18), a first clamping arm (28) pivotably mounted on the housing side, which has rollers (20) on the pressing chamber side for guiding a loop of the pressing element (18), and a second clamping arm (30) which is pivotably mounted on the housing side and has at least one roller (20) at a free end for guiding the pressing element (18). According to the invention, at least one pressing pressure with which the pressing element (18) acts to form a round bale (16) is adjustable according to a control function based on a size of the pressing chamber (12) and an effective length of the pressing element (18).