Round Baler Wrap Tension Control with Single-Actuator Braking
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Solution Overview
Problem
Existing balers face variability in wrapping material tension due to different grades and weights of net wrap, affecting the start, unspooling, and cutting of the wrapping material, which is not efficiently managed by separate actuators.
Innovation Solution
A round baler with a tensioning element connecting an actuator to a braking apparatus, allowing controlled tensioning of the wrapping material through varying braking forces during the wrapping process, including a first elastic and second inelastic element, and a guide element to direct the tensioning element to the braking apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate actuators are used to control the feed apparatus and braking apparatus, then each component can be controlled independently, but the system complexity increases and tension control consistency deteriorates
Solution Approach 1:
The patent combines the control of the feed apparatus and braking apparatus into a single actuator. This actuator controls both the feed mechanism that dispenses wrapping material and the braking mechanism that applies tension, reducing the total number of actuators from two to one while maintaining functional independence through integrated control logic.
Solution Approach 2:
The single actuator is designed to perform multiple functions: it controls both the feed apparatus for dispensing wrapping material and the braking apparatus for applying tension. This multi-functional actuator replaces two separate actuators, simplifying the system while maintaining the ability to independently control each function through its dual control links.
2Adaptability or versatility
If different grades and weights of net wrap are used, then operator preference and roll availability are accommodated, but tension variability increases affecting start, unspooling, and cutting operations
Solution Approach 1:
The braking apparatus is designed with dynamic tension control capability, allowing the braking force to be adjusted during operation. The single actuator can vary the braking force applied to the wrapping material roll, adapting tension levels to accommodate different net wrap grades and weights while maintaining reliable start, unspooling, and cutting operations.
Solution Approach 2:
The system changes the braking force parameter dynamically based on the specific net wrap being used. By adjusting the braking force applied by the braking apparatus through the single actuator, the system compensates for variations in net wrap properties (grade, weight, diameter) to maintain consistent tension throughout the wrapping cycle.
3Manufacturing precision
If high tension is applied during wrapping material dispensing, then cutting performance improves, but start and unspooling operations become difficult
Solution Approach 1:
The single actuator applies braking force in a periodic or phase-dependent manner during the wrapping cycle. High braking force (and thus high tension) is applied specifically during the cutting phase when the cutting apparatus engages the wrapping material, while lower braking force is applied during start and unspooling phases, optimizing performance for each operational stage.
Solution Approach 2:
The braking force is dynamically adjusted based on the operational phase. The actuator increases braking force when cutting is required to ensure clean cuts, while reducing braking force during start and unspooling to facilitate smooth material dispensing. This dynamic adjustment resolves the contradiction between needing high tension for cutting and low tension for easy start/unspooling.
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
The system provides consistent tension control throughout the wrapping cycle, adapting to different roll sizes and ensuring smooth start, unspooling, and cutting of the wrapping material, enhancing the integrity of the bale formation.
Implementation Method 1
the tensioning element comprises a first elastically deformable element and a second inextensible element
Data Source
AI summary
A round baler having a baling chamber, a wrapping material reservoir, a feed apparatus having an actuator, the feed apparatus configured to convey a wrapping material from the wrapping material reservoir to the baling chamber, a cutting apparatus moveable between a retracted position allowing free movement of the wrapping material and an advanced position to cut the wrapping material, and a braking apparatus for applying a braking force on a roll of wrapping material installed in the wrapping material reservoir, and an actuator for controlling operation of the feed apparatus and the cutting apparatus. The round baler further comprises a tensioning element connecting the actuator to the braking apparatus to control a down force exerted on the roll of wrapping material and so control the tension in the wrapping material.