Composite Stirring Head for Abrasive Grit Spreader
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Solution Overview
Problem
Distribution machines face challenges in selecting a material for the stirring head that balances strength, rigidity, wear resistance, and corrosion resistance due to the abrasive and hygroscopic nature of grit materials, leading to high maintenance and replacement costs.
Innovation Solution
The stirring head is designed using a first plastic material for strength and rigidity, with an outer and bottom coating of higher abrasion-resistant plastic materials, allowing for easy assembly and replacement of the stirring fingers, and potentially using metal for the fingers for enhanced durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the stirring head is made from cast metal to achieve strength and rigidity, then the structural integrity is improved, but wear resistance deteriorates due to high susceptibility to abrasion from sharp-edged grit particles
Solution Approach 1:
The patent applies composite materials by combining a plastic base material with metal reinforcement elements (such as metal inserts or coating) in the stirring head design. This composite structure provides both the strength and rigidity of metal and the wear resistance required for handling abrasive grit particles, resolving the contradiction between structural integrity and wear resistance.
2Reliability
If the stirring head is made from stainless steel or corrosion-resistant metal to achieve high corrosion resistance, then the durability against chemical corrosion is improved, but the manufacturing cost increases unacceptably
Solution Approach 1:
The patent uses a composite construction where a cost-effective plastic material forms the base structure, and corrosion-resistant metal components are strategically applied only where needed (such as in contact zones with corrosive materials). This reduces the overall amount of expensive corrosion-resistant material required while maintaining adequate protection, thereby lowering manufacturing costs while preserving corrosion resistance.
Solution Approach 2:
The patent implements local quality by applying corrosion-resistant metal materials only in specific areas of the stirring head that are most exposed to corrosive environments, rather than using corrosion-resistant material throughout the entire component. This localized approach reduces material costs while maintaining adequate corrosion protection where it is most needed.
3Reliability
If the stirring head material is made harder to improve wear resistance, then the abrasion resistance is improved, but the toughness and impact resistance deteriorate
Solution Approach 1:
The patent employs composite materials where a tough plastic base material provides impact resistance and flexibility, while harder metal reinforcement elements or coatings are applied in wear-prone areas. This combination allows the stirring head to withstand both impact loads and abrasive wear without sacrificing overall toughness.
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
This design provides a durable, cost-effective, and corrosion-resistant stirring head that prevents sticking and ensures reliable torque transmission, reducing maintenance and extending the lifespan of the agitator components.
Implementation Method 1
an outer coating made of a second plastic material with a higher abrasion resistance than the first plastic material of the stirring head
Implementation Method 2
the material of the stirring head must have strength and rigidity in order to permanently and reliably transmit the necessary torque to the stirring finger(s)
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A spreading machine, such as an agricultural spreader or winter service spreader, is proposed, comprising a container (1) for receiving spreading material, a discharge opening (2) located at the bottom of the container (1) with a metering element (6) downstream of this opening, and a distribution element downstream of the metering element (6) for distributing the spreading material on the ground. The container (1) is equipped with an agitator (3) which includes a return shaft (5) that penetrates the wall of the container (1) and projects into it. A mixing head (12) is attached to the free end of the mixing head. This head seals the mixing shaft (5) against the wall of the container (1) and is designed to support a mixing finger (4) designed as a separate component.The invention provides that the stirring head (12) is made of a first plastic material (30), wherein the stirring head (12) is further provided with an outer coating made of a second plastic material and/or with a base coating made of a third plastic material, which has or have a higher abrasion resistance and/or lower hardness compared to the first plastic material (30) of the stirring head (12). The stirring finger (4) is fixed in a fully enclosed receptacle extending radially in the direction of the stirring head (12).