Round Baler Wrap System Torque Control for Ejection Trajectory
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Solution Overview
Problem
Existing round balers face challenges in controlling the mesh trajectory of wrap material as it is ejected from the nip between spool rollers, leading to misalignment and blockage of the wrap material from entering the baling chamber.
Innovation Solution
A round baler with a torque controller system that adjusts the torque transmitted to the spool rollers based on the current weight of the supply roll of wrap material, ensuring a desired acceleration rate and aligning the leading edge of the wrap material with the access into the baling chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the wrap material is ejected from the nip between spool rollers with high acceleration, then the wrapping speed is improved, but the ejection trajectory becomes unpredictable and misaligned with the access
Solution Approach 1:
The system dynamically adjusts the acceleration rate of the spool rollers based on the real-time weight of the supply roll. As the supply roll weight decreases during the wrapping cycle, the acceleration rate is increased to maintain consistent ejection trajectory and leading edge alignment with the access, thereby resolving the contradiction between maintaining high wrapping speed and ensuring precise trajectory control
Solution Approach 2:
The controller modifies the acceleration parameter of the spool rollers as a function of supply roll weight. By changing the acceleration rate parameter dynamically throughout the wrapping cycle, the system maintains optimal ejection trajectory alignment despite variations in supply roll mass, thus achieving both high productivity and manufacturing precision
2Reliability
If the supply roll weight varies during the wrapping cycle, then the available torque from the driver becomes insufficient to maintain consistent acceleration, but increasing torque continuously would waste energy
Solution Approach 1:
The system employs a feedback mechanism where the weight of the supply roll is continuously monitored and used to adjust the torque applied by the driver. This closed-loop control ensures that torque is optimized based on actual conditions, maintaining consistent acceleration and ejection trajectory while avoiding unnecessary energy consumption that would result from continuous maximum torque application
Solution Approach 2:
The driver torque is dynamically adjusted throughout the wrapping cycle based on supply roll weight variations. The system transitions from high torque when the supply roll is heavy to reduced torque when the supply roll is lighter, maintaining reliable acceleration consistency while optimizing energy usage by matching torque output to actual operational needs
3Reliability
If the leading edge of the wrap material does not align with the access, then the wrap material is blocked from entering the baling chamber, but adjusting the ejection angle requires complex mechanical modifications
Solution Approach 1:
The system replaces complex mechanical adjustments for ejection trajectory control with a control system that dynamically adjusts spool roller acceleration rates. By using electronic control and software algorithms instead of mechanical linkages or adjustable components, the system achieves reliable wrap material feed alignment without increasing mechanical device complexity
Solution Approach 2:
Instead of mechanically adjusting the ejection angle, the system changes the acceleration parameter of the spool rollers to control the ejection trajectory. This parameter-based control approach achieves reliable alignment of the leading edge with the access while avoiding the complexity of mechanical adjustment mechanisms
Data Source
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AI summary
A method of controlling a wrap system of a round baler includes determining a current characteristic of a supply roll of wrap material related to a current weight of the supply roll, and controlling rotation of a pair of spool rollers based on the current characteristic of the supply roll. As the current characteristic indicates a decrease in weight, the rotation of the pair of spool rollers is controlled to achieve a desired acceleration rate of the spool rollers, such that a leading edge of the wrap material is ejected from a nip formed between the pair of spool rollers at an ejection trajectory that is within an allowable angular range relative to a tangent of the nip, so that the leading edge of the wrap material passes through an access and into a baling chamber of the round baler.