Screening Tool Composite Layer for Wear and Impact Damping
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Solution Overview
Problem
Existing tools used in mineral and plant material processing machines suffer from high wear due to impacts with hard materials, leading to significant wear and tear and noise generation.
Innovation Solution
A sieving device with a functional unit comprising a hard material and an intermediate material with lower elasticity, which acts as a damping element to absorb impact energy, combined with a wear-resistant layer to enhance durability and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hard material is used for wear protection, then wear resistance is improved, but impact resistance deteriorates due to high modulus of elasticity
Solution Approach 1:
The patent applies composite materials by combining hard material (for wear resistance) with intermediate material having lower modulus of elasticity (for impact resistance). The hard material is attached to the tool body with the intermediate material in between, creating a composite structure that leverages the advantages of both materials - the hard material provides wear protection while the intermediate material absorbs impact energy through its elastic deformation.
Solution Approach 2:
The intermediate material acts as an intermediary layer between the hard material and the tool body. This mediator absorbs and dampens impact forces before they reach the hard material, preventing direct transmission of shock loads that would cause breakage. The intermediate material's lower modulus of elasticity allows it to deform elastically under impact, protecting the brittle hard material layer.
2Duration of action of stationary object
If hard material is used for wear protection, then service life is improved, but noise generation increases due to impact
Solution Approach 1:
The intermediate material serves as a noise-dampening intermediary between the impacting hard materials and the tool body. Its elastic properties allow it to absorb impact energy through deformation, converting mechanical impact energy into elastic strain energy and heat, thereby reducing the noise generated by direct impacts on the hard material and tool body.
Solution Approach 2:
The patent converts the harmful impact energy that causes noise into beneficial elastic deformation of the intermediate material. The impact energy is absorbed and dissipated through the elastic properties of the intermediate material, transforming the harmful noise-generating impact into a useful damping effect that protects the hard material and reduces noise.
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 device provides improved wear resistance and longer service life, along with reduced noise generation by damping impact energy, while minimizing the risk of breakage.
Implementation Method 1
Due to the lower modulus of elasticity of the intermediate material, it can advantageously dampen impact energy, particularly when the tool collides with hard materials
Implementation Method 2
the intermediate material is arranged between the hard material and the tool body... the modulus of elasticity of the intermediate material is up to 66% of the modulus of elasticity of the tool body
Data Source
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AI summary
The invention relates to a tool (10, 20) for fastening on a machine, in particular a screen machine, a road groover, or similar, the tool having a tool body (12, 50, 53), on which a functional unit (11, 11.1, 11.2, 11.4, 40, 30) comprising at least two materials of different damping properties is fastened, one material being a mechanically resistant material (11, 11.1, 11.2, 31, 32) and an intermediate material (11.4, 42, 43) being provided between the mechanically resistant material (11, 11.1, 11.2, 31, 32) and the tool body (12, 50, 53). An improved wear resistance compared to the wear resistance known from prior art is achieved in that the modulus of elasticity of the intermediate material (11.4, 42, 43) amounts to 30 % of the modulus of elasticity of the mechanically resistant material (11, 11.1, 11.2, 31, 32).