Symmetrical Pivotable Dog Doubles Service Life in Square Baler Ejector
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Solution Overview
Problem
Existing ejector systems in square balers face issues such as high wear and frequent replacement of dogs, snagging of crop on stops, and delayed gripping of bales, leading to inefficiencies and increased maintenance.
Innovation Solution
Design of a symmetrical dog with two pointed ends and pivotable mounting features, allowing for reversible use and reduced snagging risks, with a center of gravity positioning for gravity or spring bias to ensure immediate gripping in the extended position, and minimal material wastage in manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dogs are made asymmetrical with a single pointed end, then they can engage effectively in bales during forward stroke, but they require frequent replacement due to wear at the single engagement point
Solution Approach 1:
The patent applies asymmetry in reverse - it uses symmetry to solve an asymmetry problem. The dog is made symmetrical with two identical pointed ends instead of the conventional asymmetrical single-pointed design. This allows the dog to be reversed when one end wears, effectively doubling its service life while maintaining the same effective engagement geometry with the bale.
Solution Approach 2:
The patent inverts the conventional wisdom by making the dog symmetrical rather than asymmetrical. Instead of having a single engagement point that wears out, the dog has two identical engagement points that can be alternated, reversing the wear pattern and extending component life.
2Manufacturing precision
If stops are added to control dog movement, then dog positioning is improved, but crop material may snag on the stops causing delays
Solution Approach 1:
The patent extracts or removes the stops that were previously used to control dog movement and positioning. By eliminating these protruding stops, the design prevents crop material from snagging on them, thereby maintaining continuous bale advancement without delays while still achieving adequate dog positioning through alternative means.
3Ease of operation
If dogs are designed with extended positioning features, then engagement control is improved, but the complexity of the dog structure increases
Solution Approach 1:
The patent segments the dog into two identical functional ends rather than having a single complex end with multiple features. Each end is a simpler, identical structure that can engage the bale effectively, reducing overall structural complexity while maintaining engagement control through the symmetrical design.
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 symmetrical dog design doubles its useful life by allowing reversal when one end wears out, reduces snagging risks, and ensures immediate bale gripping, enhancing operational efficiency and reducing maintenance needs.
Implementation Method 1
the dog may be spring biased or designed so that its own weight rotates it into the extended position
Implementation Method 2
the dog may be spring biased or designed so that its own weight rotates it into the extended position
Data Source
Figure 1~5
AI summary
A dog is disclosed for mounting on a shuttle assembly of a bale ejector system of a square baler. The dog (222) has two pointed ends and at least one mounting feature (223) that permits the dog to be pivotably mounted on the shuttle assembly. The dog (222) is symmetrical so as to be selectively capable of being mounted on the shuttle assembly in each of two orientations in order to extend the service life of the dog.