Round Baler Discharge Flap Speed Control
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Solution Overview
Problem
Existing round balers often cause damage to wrapped bales during ejection due to insufficient opening of the ejection flap, leading to potential damage of the wrapping material.
Innovation Solution
A round baler with a sensor-controlled ejection flap that accelerates its opening movement at the end, ensuring a faster and more controlled ejection process to maintain a safe distance from the bale and prevent damage, utilizing an actuator and acceleration device to adjust speed based on the flap's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the discharge flap opens slowly and steadily, then the ejection process is controlled and stable, but the wrapping material may be damaged due to insufficient opening speed at the end
Solution Approach 1:
The discharge flap opening process is made dynamic by varying the opening speed during different phases. The flap opens slowly during the initial phase to maintain stability, then accelerates rapidly during the final phase to prevent wrapping material damage, and finally closes slowly to ensure controlled completion. This dynamic speed adjustment resolves the contradiction between controlled operation and damage prevention.
Solution Approach 2:
The discharge flap operation is divided into distinct periodic phases: slow opening phase, rapid opening phase, bale ejection phase, and slow closing phase. Each phase serves a specific function and operates at an optimized speed, transforming a single-speed operation into a multi-phase periodic action that simultaneously achieves stability and damage prevention.
2Reliability
If the discharge flap opens wide enough to avoid damage, then wrapping material is protected, but the baling chamber may not close properly for the next bale
Solution Approach 1:
The discharge flap employs dynamic positioning with distinct phases: it opens rapidly to a maximum position to ensure wrapping material protection, then closes to a specific intermediate position that is sufficient for the next bale formation. This dynamic position control resolves the contradiction between opening wide enough for protection and closing adequately for continuous operation.
3Reliability
If the discharge flap remains closed during bale formation, then the baling chamber is sealed, but the bale cannot be ejected efficiently
Solution Approach 1:
The discharge flap operates in periodic cycles: closed position during bale formation to maintain sealing, rapid opening position during ejection to maximize efficiency, and controlled closing to prepare for the next cycle. This periodic action between closed and open states resolves the contradiction between maintaining seal integrity and achieving efficient ejection.
Data Source
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AI summary
The invention relates to a round baler (10) with a bale pressing chamber (26) and a discharge flap (30) which is movable along a path between a closed position in which the discharge flap (30) closes the bale pressing chamber (26) and an open position in which a round bale (12) can be discharged from the bale pressing chamber (26). The round baler further comprises a sensor (44, 46, 48) connected to a control unit (52) for providing information about the position of the discharge flap (30) along the path, and an actuator (40) connected to the control unit (52) for adjusting the discharge flap (30), wherein the control unit (52) is operable to adjust the actuator (30) depending on the signal value of the sensor (44, 46, 48) in such a way that the actuator (30) moves at a speed which depends on the respective position of the discharge flap (30).The control unit (52) can be operated such that the end of an opening movement of the discharge flap (30) occurs faster than the rest of the opening movement. The invention further relates to a method for operating a round baler.