Round Baler Lower Tailgate Ejection Mechanism
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Solution Overview
Problem
Conventional round balers require heavy-duty actuators and large clearances to move bales to a wrapping device, leading to instability on sloping ground and inefficiencies in bale transfer, especially when using low-power actuators.
Innovation Solution
A round baler design with a lower tailgate section that can be lowered to eject bales without driving force, using a vertically movable support and rollers to transfer bales to a wrapping table, distributing the bale's weight and reducing the force required for lifting, while minimizing the risk of tipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If heavy-duty long-stroke actuators are used to lift and hoist the bale over the lower tailgate section axis, then the bale can be moved from the baling chamber to the wrapping device, but the device complexity and power requirements increase significantly
Solution Approach 1:
A changing table with front and rear rollers is introduced as an intermediary device between the baling chamber and the wrapping device. The bale is transferred in two stages: first to the changing table, then to the wrapping device. This intermediary structure distributes the lifting force and eliminates the need for heavy-duty actuators to lift the entire bale weight in one motion.
Solution Approach 2:
The bale transfer process is segmented into two distinct stages: (1) transfer from baling chamber to changing table, and (2) transfer from changing table to wrapping device. This segmentation allows lighter actuators to handle smaller portions of the bale weight at each stage, reducing overall system complexity and power requirements.
2Ease of operation
If the wrapping table is located far below the lower tailgate section axle, then the bale transfer is easier, but the bale picks up too much momentum and rolls over the wrapping table
Solution Approach 1:
The bale is preliminarily positioned and stabilized on the changing table before being transferred to the wrapping device. The front and rear rollers on the changing table provide controlled support points that prevent excessive momentum buildup. This preliminary positioning ensures the bale is ready for controlled transfer without gaining harmful rolling momentum.
3Ease of operation
If the center of gravity of the bale is significantly higher on the wrapping table than in the baling chamber, then the bale can be wrapped, but the stability of the baler on sloping ground is impaired
Solution Approach 1:
The changing table acts as an intermediary platform that maintains a lower center of gravity during bale transfer. By using the front and rear rollers on the changing table as support points, the system achieves stable bale positioning without requiring the bale's center of gravity to be significantly elevated, thus preserving baler stability on sloping ground.
4Productivity
If a large clearance is required between the baling chamber and the bale wrapper, then the bale chamber can close and continue operating, but the overall device size and complexity increase
Solution Approach 1:
The bale transfer mechanism utilizes a two-stage vertical and horizontal transfer approach through the changing table. This dimensional approach allows the baling chamber and wrapping device to be positioned closer together spatially while maintaining operational independence, reducing the overall device volume without compromising continuous operation capability.
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
Enables compact, low-power operation with reduced risk of tipping on sloping ground, facilitating efficient bale transfer and wrapping with lower operational forces and improved stability.
Implementation Method 1
the lower tailgate section can be lowered to eject a bale from the bale chamber. In order to lower the tailgate section and with it the bale in a controlled manner, no driving force is required
Implementation Method 2
an intermediate position for the bale is provided between the bale chamber and the wrapping table, in which the bale is supported by a front edge of the wrapping table and a vertically movable support. Since the weight of the bale is distributed between the wrapping table and the support in this intermediate position, a force that is significantly smaller than the weight of the bale is sufficient to lift the support
Implementation Method 3
The wrapping table may comprise a front and a rear roller which support the bale in the wrapping position and which can be driven in rotation to wrap the bale
Data Source
Figure 1~3
Figure 4
Figure 5~8
AI summary
A round baler has a housing (6) surrounding a baling chamber (3), comprising a base section (7), an upper tailgate section (8) that can be raised from a baling position, and a lower tailgate section (9). A bale wrapping device (4) includes a wrapping table (15) located behind the housing (6). The lower tailgate section (9) can be lowered to eject a bale (22) from the baling chamber (3).