Haymaking Machine Rotor Protective Cover Design
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Solution Overview
Problem
Existing haymaking machines face issues with broken working tool coils and strands detaching during encounters with obstacles, leading to potential projection, loss, and damage in forage harvesting processes.
Innovation Solution
The protective cover of the haymaking machine features a front tab that extends over the outer side of the turns and forms a closed loop with the arm, retaining the coils and preventing detachment, along with a positioning lug for stabilization, ensuring the coils remain attached to the arm even during breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If protective covers are used to cover the turns, then fodder contamination is prevented, but broken coils and strands can still detach and be projected
Solution Approach 1:
The protective cover is designed with a nested structure where the cover itself contains the turns, and the front tab extends into the loops to provide an additional retention level. This nested arrangement ensures that even if the outer cover is present, broken strands are captured by the front tab's extension into the loop structure.
Solution Approach 2:
The front tab acts as an intermediary element between the protective cover and the strand loops. It extends into the loops formed by the turns and provides a mechanical interface that captures broken strands, preventing their projection while maintaining the protective function of the cover.
2Object-affected harmful factors
If the protective cover only covers the turns, then fodder is protected, but the position of the cover relative to the turns is unstable during shocks
Solution Approach 1:
The positioning means is pre-configured on the protective cover to engage with the arm structure before any breakage or shock occurs. This preliminary positioning ensures that the cover maintains its correct position relative to the turns even when subjected to sudden forces during operation.
Solution Approach 2:
The positioning means is located at a specific local position on the protective cover, providing targeted stabilization at the critical interface between the cover and the arm. This localized quality enhancement ensures stability without requiring changes to the entire cover structure.
3Ease of manufacture
If simple protective covers are used, then manufacturing is easy, but broken strands can escape through gaps and cause damage
Solution Approach 1:
The protective cover is segmented into functional zones: the main cover body for protection and the front tab extension for strand retention. This segmentation allows the cover to be manufactured using simple processes while the added front tab feature provides the additional safety function without requiring complex manufacturing.
Solution Approach 2:
Instead of trying to prevent strand breakage directly, the invention inverts the approach by designing the protective cover to capture and retain strands after breakage occurs. The front tab extends into the loops to catch broken strands, reversing the traditional approach of focusing solely on prevention.
Data Source
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AI summary
The machine has a frame carrying rotors that are provided of a tool-holder arm (7) whose outer end is extended from a hub and carries a working tool (8) having strands (9, 10). The strands are connected by a part including coils (11) which form loops. A bent section (12) serves to the fixation on the outer end, using a bolt (13), in which the outer end is engaged in the loops until the bent section and the coils are covered by a protective cover (15). The cover has a front leg (17) passing over an exterior side of the coils and is extended at interior of the loops till the outer end.