Bale Wrapping Table Height Adjustment Mechanism
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Solution Overview
Problem
Existing crop bale wrapping devices fail to precisely position the bale at the center of the wrapping material dispenser, leading to uneven tension and tightness around the bale's circumference due to height adjustments causing horizontal movement.
Innovation Solution
The device adjusts the distance between support rollers and allows for height-adjustable idlers connected via pivotable arms that rotate in opposite directions, ensuring the bale's center remains aligned with the wrapping material dispenser, using a control unit to determine bale size and adjust positioning and wrapping material usage accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the winding table is height-adjustable to accommodate varying bale sizes, then the adaptability to different bale dimensions is improved, but the horizontal positioning accuracy of the bale relative to the wrapping material dispenser deteriorates
Solution Approach 1:
The height adjustment mechanism is segmented into two independent components: a primary actuator that moves the control plate vertically, and a secondary actuator that independently adjusts the winding table height. This segmentation allows each actuator to perform a specific function without interfering with the other, enabling height adjustment while maintaining horizontal positioning accuracy.
Solution Approach 2:
The control plate serves as an intermediary element between the frame and the winding table. It is connected to the frame via the primary actuator and to the winding table via a pivotable connection. This intermediary structure allows the winding table to be height-adjusted through the secondary actuator without causing horizontal displacement of the bale, as the control plate absorbs and isolates the vertical movement.
2Stability of the object's composition
If a second actuator is added to prevent the changing table from tipping during height adjustment, then the stability of the wrapping process is improved, but the device complexity increases
Solution Approach 1:
The connection between the control plate and the winding table is made pivotable rather than rigid. This dynamic connection allows the winding table to adjust its angle slightly during height adjustment, accommodating the movement without requiring complex rigid constraint mechanisms. The pivotable connection provides the necessary degrees of freedom to maintain stability while simplifying the overall structure.
3Manufacturing precision
If the arms are made equal in length and inclined at specific angles to achieve compact design, then the manufacturing precision and compactness are improved, but the ease of manufacture decreases
Solution Approach 1:
The support arms are designed with specific geometric parameters: equal lengths and predetermined inclination angles that cause them to pivot in opposite directions when the winding table height is adjusted. These parameter changes ensure that the rollers move vertically without causing horizontal displacement of the bale. While the manufacturing and assembly become more precise, the symmetrical design and standardized parameters actually facilitate mass production and reduce variability.
Data Source
Figure 1~4
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AI summary
A device (4) for wrapping bales of harvested crops (43, 43') comprises a wrapping table (11) and at least one wrapping material dispenser (18) which is guided on a track around the bale of harvested crops (43, 43') supported by the wrapping table (11). The bale of harvested crops (43, 43') can be supported on the wrapping table (11) in various positions, in particular purely vertically spaced positions.