Offset Restoring Element for Soil Aeration Tool Holder
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Solution Overview
Problem
Existing soil aeration devices with high spring stiffness risk creating slots in the soil surface instead of small holes due to the forceful return of piercing tools, which can damage machine components.
Innovation Solution
A soil aeration device with a restoring element offset from the plane of the tool holder's pivot axis, increasing the lever arm and reducing spring stiffness, thereby minimizing the risk of slot formation and mechanical stress on machine elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spring elements with high spring stiffness are used to move piercing tools back into their starting position, then the piercing tools can be reliably returned to their initial position, but the risk of creating slots in the soil surface increases and mechanical stress on machine components increases
Solution Approach 1:
The restoring element is offset from the plane containing the pivot axis and tool holder, creating a three-dimensional arrangement. This offset positioning increases the lever arm length, allowing the restoring moment to be amplified without increasing spring stiffness. The restoring element acts at a distance from the pivot axis, creating a larger rotational moment arm that efficiently returns the tool holder to its initial position while using a softer spring.
Solution Approach 2:
The restoring element is positioned asymmetrically relative to the tool holder and pivot axis. By offsetting the restoring element from the symmetric plane, the design creates an asymmetric lever arm configuration that maximizes the restoring moment at critical positions (when the piercing tool is outside the soil) while minimizing the restoring moment when the tool is in the soil, thereby preventing slot formation.
2Reliability
If spring elements with high spring stiffness are used to move piercing tools back into their starting position, then the piercing tools can be reliably returned to their initial position, but the impact of the piercing tool against the stop increases which can damage the bearings
Solution Approach 1:
The offset positioning of the restoring element in three-dimensional space creates a longer lever arm that extends perpendicular to the plane of the tool holder. This dimensional change allows the system to achieve the required restoring moment with lower spring stiffness, thereby reducing the impact force when the tool holder returns to its initial position and minimizing stress on the bearings.
Solution Approach 2:
The invention changes the geometric parameter of the restoring element's position (offset distance from the pivot axis plane). By adjusting this positional parameter, the lever arm length is increased, which allows the spring stiffness parameter to be reduced while maintaining the same restoring moment capability, thus reducing impact forces on mechanical components.
3Object-generated harmful factors
If the lever arm of the restoring force is increased by offsetting the restoring element, then the spring stiffness can be reduced, but the device complexity increases
Solution Approach 1:
The offset restoring element serves multiple functions simultaneously: it provides the restoring moment to return the tool holder to its initial position, it reduces the required spring stiffness, and it minimizes the impact force on the stop. This single structural modification achieves multiple beneficial effects without requiring additional components or complex mechanisms.
Solution Approach 2:
The restoring mechanism is segmented into distinct functional components: the restoring element (spring), the offset positioning structure, and the lever arm configuration. This segmentation allows each component to be optimized independently while working together to achieve the overall goal of reducing spring stiffness and preventing slot formation.
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 solution effectively reduces the risk of slot formation and lowers mechanical stress on machine components by increasing the restoring moment at maximum deflection, allowing for efficient soil aeration without damaging the soil surface or machine parts.
Implementation Method 1
a restoring element (30) is offset at a distance from the plane running through the first pivot axis (14) and in the direction of the restoring force of the restoring element (30) acting on the tool holder (6) engages the tool holder (6)
Implementation Method 2
the lever arm of the restoring force acting about the first pivot axis (14) is increased relative to the starting position at least at maximum deflection of the tool holder (6)
Implementation Method 3
A larger lever arm results in a larger moment with the same force. The restoring moment that acts on the tool holder when the tool holder is deflected to its maximum is therefore greater than the restoring moment that acts on the tool holder in the starting position
Data Source
Figure 1~2
Figure 3~4
Figure 5~7
AI summary
In a mobile soil aeration device (1) comprising a machine frame (2), a drive, at least one guide arm (12) which is moved up and down by the drive and pivotably arranged on the machine frame (2) and which has at least one piercing tool (4) articulated to the guide arm (12), wherein the piercing tool (4) can be inserted into and withdrawn from the soil, a tool holder (6) for the piercing tool (4) which is mounted about a first pivot axis (14) in the guide arm (12) which is moved up and down by the drive in order to allow the piercing tool (4) to pivot relative to the guide arm (12) during soil penetration, wherein the piercing tool (4) is in a starting position at a predetermined penetration angle before penetration, and wherein at least after the piercing tool (4) is withdrawn from the soil (8) a return element (30) acting on the tool holder (6) acts,To ensure that the grooving tool (4) pivots back to its initial position, the return element (30) is positioned at a distance from the plane running through the first pivot axis (14) and parallel to the tool holder (6) and the grooving tool (4), and offset in the direction of the return force of the return element (30) acting on the tool holder (6), whereby the lever arm of the return force acting about the first pivot axis (14) is increased at maximum deflection of the tool holder (6) relative to the initial position.